ES2989707T3 - Burner and water heating device - Google Patents

Abstract

A casing (10) for a burner (100), a burner (100) and a water heating apparatus. The casing (10) comprises: side closing plates (11) enclosing an installation space allowing vertical passage for installation of a burner unit (20) of a burner (100); and an air distribution plate (12) sealing an opening of the lower end of the installation space and configured to be positioned above the burner unit (20), wherein the air distribution plate (12) has a first air port (1021) and a second air port (1022) spaced apart from each other and used for air intake, the first air port (1021) being in communication with an internal air channel (202) in the burner unit (20) and the second air port (1022) being in communication with an external air channel (203) positioned on one side of the burner unit (20). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Burner and water heating device

Cross reference to related requests

This application claims priority to China Patent Applications Nos. 201910337759.1, 201920580733.5, 201910337770.8, and 201920580690.0, filed on Apr. 25, 2019 by Wuhu Midea Kitchen & Bath Appliance Mfg. Co., Ltd. and Midea Group Co., Ltd.

Field

The present invention relates to the technical field of burners and, more particularly, to a housing for a burner, a burner and a water heating apparatus.

Background

At present, countries around the world have made increasingly strict requirements on environmental protection, especially in the European region. In the water heating appliance industry, laws and standards have been specified to regulate and limit the exhaust gas emissions of water heating appliances. In order to achieve low nitrogen emissions and economical cost requirements, water-cooled combustion technology has quietly emerged on the market. Since the water-cooled burner is a natural-mix atmospheric burner, structures of the conventional natural-mix atmospheric burner have been used in the related art, including an open structure and a structure that is simply connected by a pull rod.

Such a structure has the following disadvantages: unable to improve combustion intensity; too many individual combustion parts; required design of all parts to be large, resulting in huge volume and high manufacturing cost; poor combustion performance; reduced nitrogen oxides after mixed air is increased; and poor flame stability, prone to go out, difficult to ignite, and difficult to spread fire.

JP 2000 171010 A discloses that a combustion device is constituted so that a burner is provided in a combustion chamber box and a burner box is arranged around the outer periphery of the combustion chamber box while an air flow tube passage, provided through the entire periphery of the inside of the burner box, is formed between the burner box and the combustion chamber box, and an air supplying means communicates with the air flow passage so that cooling air passes through the inside of the air flow passage. A bottom space communicating with the lightening flame port is formed in the lightening mixing chamber, and the air-fuel mixture is discharged from the plurality of jet ports formed in the lightening gas communication passage in the lightening mixing chamber. A light air introduction port formed below the light mixing chamber is connected to the fan through the air chamber.

CN 108 534 139 A discloses a burner and a water heater. The burner comprises a plurality of fire distributors, each fire distributor being provided with at least three ejector pipes, and the multiple fire distributors being arranged in parallel. Fastening pieces penetrate through the multiple fire distributors and connect the multiple distributors into a fire line. Pressing portions are arranged at the extending ends, relative to the fire line, of the fastening pieces, and the pressing pieces press against the fire line. In one example, the ejector tube includes a first ejector tube, a second ejector tube, and a third ejector tube. The gas separation device may include a first gas passage, a second gas passage, and a third gas passage. The first gas passage communicates with the first ejector tube corresponding to its position through the first nozzle; the second gas passage communicates with the second ejector tube corresponding to its position through the second nozzle; the third gas passage passes through. The third nozzle is in communication with the third ejector tube corresponding to its position.

CN 205878626 U discloses a combustion chamber subassembly and gas heater, wherein, the combustion chamber subassembly includes the combustor and is used for holding the combustor and opening the combustion chamber upward. The foot on the bottom wall of the combustion chamber, and the support is provided with a first air inlet hole. The first air inlet hole communicates with the air injection pipe assembly as an auxiliary air inlet. Preferably, the opening of the first air inlet hole is smaller than the opening of the third air inlet hole. The bottom air inlet is realized by providing the first air inlet hole on the intake air base on the side of the third air inlet.

It is the object of the present invention to provide an improved burner and an improved heating apparatus comprising said burner.

This object is achieved by the subject matter of independent claims.

Embodiments are defined by the dependent claims.

Summary

The present disclosure aims to solve at least one of the technical problems existing in the prior art. In this regard, an object of the present disclosure is to provide a burner and to reduce the volume of the burner.

The present invention provides a burner.

The present invention provides a water heating apparatus having the above-mentioned burner.

A burner according to the present invention is provided comprising a side enclosing plate and an air distribution plate. An installation space penetrating in an up-down direction is enclosed and defined by the side enclosing plate, and a burner unit of the burner is installed in the installation space. The air distribution plate is arranged and seals a lower end opening of the installation space and is located above the burner unit. A first air inlet and a second air inlet, for intake of air, are defined in the air distribution plate and spaced apart from each other. The first air inlet is in communication with an internal gas channel in the burner unit, and the second air inlet is in communication with an external gas channel located in a side portion of the burner unit.

The burner according to the example of the present disclosure can advantageously improve the combustion efficiency of the burner and reduce the volume of the burner.

Furthermore, the burner according to the aforementioned example of the present disclosure may have the following additional technical features.

According to some embodiments of the present example, a plurality of burner units are provided in the installation space and are sequentially arranged along a left-right direction, a plurality of first air inlets and a plurality of second air inlets are provided, the plurality of first air inlets and the plurality of second air inlets are alternately arranged along an arrangement direction of the plurality of burner units, and the plurality of first air inlets are in communication with internal gas channels of the plurality of burner units in one-to-one correspondence.

In accordance with some examples of the present disclosure, each of the plurality of first air inlets comprises a plurality of air holes spaced apart from one another along a front-rear direction.

According to some examples of the present disclosure, each of the plurality of second air inlets extends in the front-rear direction to form a long strip shape, each of the plurality of second air inlets comprises a first section and a second section which are alternately arranged and in communication with each other, a width of the first section in the left-right direction is smaller than a width of the second section in the left-right direction, and in the front-rear direction, the first section corresponds to a position of an air hole of the plurality of air holes and the second section is located between two adjacent air holes of the plurality of air holes.

According to some examples of the present disclosure, the side enclosing plate is provided with a separation structure for separating the plurality of burner units.

According to some examples of the present disclosure, the separation structure comprises a separation flange disposed at an upper end of the side enclosure plate and extending into the installation space, and the separation flange abuts between two adjacent burner units of the plurality of burner units.

According to some examples of the present disclosure, an outlet of the external gas channel is defined between upper portions of two adjacent burner units, a front edge and a rear edge of the upper end of the side enclosing plate are provided with the separation flanges, respectively, and the two separation flanges cooperate with the plurality of burner units to separate two adjacent outlets.

According to some examples of the present disclosure, each of the separation flanges comprises a plurality of separation tabs arranged along the left-right direction, and two adjacent burner units of the plurality of burner units are separated by one of the plurality of separation tabs.

In accordance with some examples of the present disclosure, one burner unit of the plurality of burner units is disposed between every two spacing tabs of the plurality of spacing tabs, and the roots of the two adjacent spacing tabs are spaced apart from each other to define a spacing gap for positioning the burner unit in an up-down direction.

According to some examples of the present disclosure, the side enclosing plate is further provided with a positioning structure configured to position the burner unit in an up-down direction.

According to some examples of the present disclosure, the positioning structure comprises positioning holes extending along the up-down direction in the side enclosing plate.

According to some examples of the present disclosure, at least one of a front side surface and a rear side surface of the installation space has positioning holes provided therein, and each burner unit corresponds to at least two positioning holes.

According to some examples of the present disclosure, a lower end of the side enclosing plate is provided with a positioning flange that extends into the installation space and is configured to position a lower part of the burner unit.

According to some examples of the present disclosure, an upper part of the side enclosing plate is provided with a mounting portion for mounting an ignition needle.

According to some examples of the present disclosure, the side enclosing plate comprises: a front side plate; a rear side plate, where the front side plate and the rear side plate are spaced apart from each other in a front-rear direction; a left side plate disposed on a left side of the front side plate, where a front edge and a rear edge of the left side plate are connected to a left edge of the front side plate and a left edge of the rear side plate, respectively; and a right side plate disposed on a right side of the front side plate, where a front edge and a rear edge of the right side plate are connected to a right edge of the front side plate and a right edge of the rear side plate, respectively. Two of the lower ends of the front side plate, one lower end of the rear side plate, one lower end of the left side plate, and one lower end of the right side plate abut against the air distribution plate, and the other two of the lower end of the front side plate, the lower end of the rear side plate, the lower end of the left side plate, and the lower end of the right side plate are connected to the air distribution plate through threads.

In a second aspect, a burner according to an example of the present disclosure comprises a burner housing according to the embodiment of the present disclosure in the first aspect.

In a third aspect, a burner according to an embodiment of the present disclosure comprises: a housing defining a housing cavity, wherein an air inlet is defined in a lower portion of the housing and a combustion port is defined in an upper portion of the housing, and the air inlet and the combustion port are in communication with the housing cavity; and at least one burner unit disposed in the housing cavity, wherein a fire combustion hole exposed from the combustion port is defined in an upper portion of each of the at least one burner unit, and an internal gas channel is defined in each of the at least one burner unit to allow a portion of air entering the air inlet to flow into the fire combustion hole through the internal gas channel. The burner has an external gas channel provided on an outer side surface of each of the at least one burner unit, the external gas channel being in communication with the air inlet and the combustion port to allow another part of the air entering the air inlet to flow into the fire combustion hole through the external gas channel.

According to some embodiments of the present disclosure, the at least one burner unit comprises a plurality of burner units sequentially arranged in a horizontal direction, and along an arrangement direction of the burner units, each of the plurality of burner units has the external gas channel provided on at least one side thereof.

In accordance with some embodiments of the present disclosure, the external gas channel is provided between and shared by two adjacent burner units of the plurality of burner units.

According to some embodiments of the present disclosure, the burner unit comprises a burner top plate, wherein the fire combustion hole is provided in the burner top plate, and a burner side plate connected to the burner top plate. The internal gas channel is defined by the burner top plate and the burner side plate, the external gas channel provided between two adjacent burner units is formed by at least the spacing of two adjacent burner side plates, and the external gas channel provided between the burner unit and the housing is formed by at least the spacing of the burner side plate and the housing.

According to some embodiments of the present disclosure, the burner top plate is arranged and covers an upper portion of the burner side plate, the burner top plate is provided with a downwardly extending outer flange, and an outlet of the external gas channel is formed by spaced outer flanges of two adjacent burner top plates.

According to some embodiments of the present disclosure, the burner side plate comprises a first side plate and a second side plate, the first side plate and the second side plate are horizontally spliced to form a hollow structure extending in an up-down direction, the burner top plate is disposed on and covers an upper portion of the hollow structure, the external gas channel provided between two adjacent burner units is formed by at least spacing the first side plate and the second side plate that are adjacent to each other, and the external gas channel provided between the burner unit and the casing is formed by at least spacing the casing and the first side plate or the second side plate, whichever is adjacent to the casing.

In accordance with some embodiments of the present disclosure, the burner further comprises a liquid cooling pipe extending within the housing. The liquid cooling pipe is proximate to at least one burner unit or connected to the at least one burner unit, and the liquid cooling pipe is closer to the fire combustion port than an inlet of the internal gas channel.

According to the invention, a side enclosure plate, in which an installation space penetrating in the up-down direction is enclosed by the side enclosure plate, allowing a burner unit of the burner to be installed in the installation space; an air distribution plate disposed in and sealing a lower end opening of the installation space and configured to be positioned above the burner unit, in which a first air inlet and a second air inlet for air intake are defined in the air distribution plate and spaced apart from each other, in which the first air inlet is in communication with the internal gas channel in the burner unit, the second air inlet is in communication with the external gas channel located at a side portion of the burner unit.

According to some embodiments of the present disclosure, where the installation space is configured to accommodate a plurality of burner units sequentially arranged along a left-right direction, a plurality of the first air inlets and a plurality of the second air inlets are provided, the plurality of the first air inlets and the plurality of the second air inlets are alternately arranged along the arrangement direction of the plurality of burner units, the plurality of the first air inlets are in communication with internal gas channels of the plurality of burner units in one-to-one correspondence.

According to some embodiments of the present disclosure, the side enclosing plate comprises: a front side plate; a rear side plate, wherein the front side plate and the rear side plate are spaced apart from each other in a front-rear direction; a left side plate disposed on a left side of the front side plate, wherein a front edge and a rear edge of the left side plate are respectively connected to a left edge of the front side plate and a left edge of the rear side plate; a right side plate disposed on a right side of the front side plate, wherein a front edge and a rear edge of the right side plate are respectively connected to a right edge of the front side plate and a right edge of the rear side plate, wherein two of a lower end of the front side plate, a lower end of the rear side plate, a lower end of the left side plate, and a lower end of the right side plate abut against the air distribution plate, the other two of the lower end of the front side plate, the lower end of the rear side plate, the lower end of the left side plate, and the lower end of the right side plate are connected to the air distribution plate through threads.

According to some embodiments of the present disclosure, wherein the side enclosing plate is provided with a separation structure for separating the plurality of burner units, the separation structure comprises a separation flange disposed at an upper end of the side enclosing plate and the separation flange extending in the installation space, and the separation flange is configured to abut between two adjacent burner units of the plurality of burner units.

According to some embodiments of the present disclosure, wherein an outlet of the external gas channel is defined between upper portions of two adjacent burner units, a leading edge and a trailing edge of the upper end of the side enclosing plate are respectively provided with the separating flanges, two of the separating flanges cooperate with the plurality of burner units to separate two adjacent outlets.

In accordance with some embodiments of the present disclosure, wherein each of the spacing flanges comprises a plurality of spacing tabs arranged along the left-right direction, two adjacent burner units of the plurality of burner units are separated by one of the plurality of spacing tabs; one burner unit of the plurality of burner units is disposed between every two spacing tabs of the plurality of spacing tabs, the roots of the two adjacent spacing tabs are spaced apart from each other to define a spacing gap for positioning the burner unit in the up-down direction.

According to some embodiments of the present disclosure, wherein the side enclosing plate is further provided with a positioning structure for positioning the burner unit in the up-down direction, the positioning structure comprises positioning holes extending along the up-down direction in the side enclosing plate; at least one of a front side surface and a rear side surface of the installation space is provided with the positioning holes, each burner unit corresponds to at least two positioning holes.

According to some embodiments of the present disclosure, wherein a lower end of the side enclosing plate is provided with a positioning flange extending into the installation space and is configured to position a lower portion of the burner unit.

According to some examples of the present disclosure, the air inlet comprises: a first air inlet in communication with the internal gas channel for introducing gas into the internal gas channel through the first air inlet; and a second air inlet in communication with the external gas channel for introducing gas into the external gas channel.

According to some examples of the present disclosure, the burner has a first combustion mode and a second combustion mode. A combustion power of the burner in the first combustion mode is lower than a combustion power of the burner in the second combustion mode, and the second air inlet is configured not to introduce gas into the external gas channel in the first combustion mode and to introduce gas into the external gas channel in the second combustion mode.

According to some examples of the present disclosure, in a horizontal direction, the top of each of the at least one burner units has a width direction and a length direction perpendicular to the width direction; along the width direction, two outlets of the external gas channels are provided on two sides of each of the at least one burner unit; the two outlets respectively extend along the length direction and are not in communication with each other.

According to some examples of the present disclosure, an inlet end of the inner gas channel has an injection structure provided therein, the injection structure being configured to inject gas into the inner gas channel.

In a fourth aspect, a water heating apparatus according to an embodiment of the present disclosure comprises: a burner housing according to the embodiment of the present disclosure in the first aspect, or a burner according to the embodiment of the present disclosure in the second aspect, or a burner according to the embodiment of the present disclosure in the third aspect.

Additional aspects and advantages of the present disclosure will be given in part in the following description, and will become partially apparent from the following description, or will be understood through practice of the present disclosure.

Brief description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments taken together with the following drawings.

Figure 1 is a schematic structural diagram of a burner according to an embodiment of the present disclosure.

Figure 2 is a schematic structural diagram of a burner unit and a liquid cooling pipe of a burner according to an embodiment of the present disclosure.

Figure 3 is a diagram of a combustion principle of a burner according to an embodiment of the present disclosure.

Figure 4 is a schematic structural diagram of a housing for a burner according to an embodiment of the present disclosure.

Figure 5 is a schematic structural diagram of an air distribution plate of a burner according to an embodiment of the present disclosure.

Figure 6 is a schematic structural diagram of an air distribution plate of a burner according to an embodiment of the present disclosure.

Figure 7 is a schematic structural diagram of a front side plate of a burner according to an embodiment of the present disclosure.

Figure 8 is a front view of a front side plate of a burner according to an embodiment of the present disclosure.

Figure 9 is a top view of a front side plate of a burner according to one embodiment of the present disclosure.

Figure 10 is a left side view of a front side plate of a burner according to an embodiment of the present disclosure.

Reference numbers:

burner 100;

casing 10; casing cavity 101; air inlet 102; first air inlet 1021; air hole 1020; second air inlet 1022; first section 1023; second section 1024; combustion port 103;

burner unit 20; fire combustion hole 201; internal gas channel 202; external gas channel 203; burner top plate 21; outer flange 211; burner side plate 22; first side plate 221; second side plate 222;

liquid cooling pipe 30;

Side enclosure plate 11; positioning flange 1101; air distribution plate 12; front side plate 111; rear side plate 112; left side plate 113; right side plate 114;

separation structure 40; separation flange 41; separation tab 411; separation gap 401; positioning structure 50; positioning hole 51; mounting portion 60; ignition needle 610.

Description of the achievements

Embodiments of the present disclosure are described in detail below. Examples of the embodiments are illustrated in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are used merely to explain the present disclosure, and cannot be construed as limitations of the present disclosure. Those skilled in the art are capable of making various changes, modifications, substitutions and variants of these embodiments without departing from the principle and purpose of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

In the present disclosure, it is to be understood that the orientation or positional relationships indicated by the terms “length,” “width,” “top,” “bottom,” “front,” “rear,” “left,” “right,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” “peripheral,” etc., are orientation or positional relationships based on the drawings solely to facilitate and simplify the description of the present disclosure, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, must be constructed, and must operate in a specific orientation. Therefore, these terms cannot be construed as limitations of the present disclosure.

Referring to the drawings, a burner 100 and a water heating apparatus having the same according to embodiments of the present disclosure are described below.

Referring to Figure 1, a burner 100 according to some embodiments of the present disclosure may comprise a housing 10 and a burner unit 20. In the embodiment illustrated in Figure 1, a plurality of burner units 20 are provided, specifically, eight burner units. The number of burner units 20 is not limited. For example, one or any number of burner units 20 may be provided. That is, in embodiments of the present disclosure, at least one burner unit 20 is provided.

4, a housing cavity 101 is defined in the housing 10, and the burner units 20 may be disposed in the housing cavity 101. An air inlet 102 is defined in a lower portion of the housing 10, and the air inlet 102 is in communication with the housing cavity 101. A combustion port 103 is defined in an upper portion of the housing 10, which is in communication with the housing cavity 101. As illustrated in FIG. 1 through FIG. 3, a fire combustion hole 201 is formed in an upper portion of the burner unit 20, and the fire combustion hole 201 is exposed from the combustion port 103. In some embodiments, the fire combustion hole 201 may be higher or lower than the combustion port 103, or may be flush with the combustion port 103. An internal gas channel 202 may be defined in the burner unit 20, which allows a portion of the air entering the air inlet 102 to flow into the fire combustion hole 201 through the internal gas channel 202, and be burned in the fire combustion hole 201. The air in the internal gas channel 201 flows in a flow direction illustrated by arrows in Figure 3.

The burner 100 is provided with an external gas channel 203 on an outer side surface of the burner unit 20. As illustrated in Figure 2 and Figure 3, the external gas channel 203 may be in communication with the air inlet 102 and the combustion port 103, allowing the other part of the air entering the air inlet 102 to flow into the fire combustion hole 201 through the external gas channel 203 and be burned in the fire combustion hole 201. The air in the external air channel 202 flows in the flow direction illustrated by the arrows in Figure 3.

Compared with a combustion apparatus of the related art, the burner 100 according to the embodiments of the present disclosure provides a new burner principle structure, which can enhance combustion, improve combustion conditions, and improve combustion performance.

Specifically, the Applicant found through research that, in the related art, only one gas channel is provided in the individual combustion part in the combustion device. Such a structure has many disadvantages in terms of, for example, all gas combustion is primary air, without secondary air, only primary air mixing and combustion can be achieved, and the combustion intensity cannot be improved; many individual combustion parts are provided, and all parts are necessarily designed to be large, resulting in high manufacturing cost; it has weak combustion performance, and after the mixed air is increased, nitrogen oxides decrease; the flame has weak stability, prone to extinguishing, difficult to ignite, difficult to spread fire; large fire or soft fire performance is maintained by a nozzle injection capacity, and the environmental adaptability is poor; due to the limited air volume required for soft fire, the combustion intensity cannot be increased; When subjected to the influence of the working air of the external fan, the air volume for soft fire is larger, and in order to ensure the overall combustion performance, the combustion intensity of large fire is smaller, and the load cannot be increased; and the combustion is of a natural suction type, in which the air speed is slow and the radiation force is large, so that the cooling effect is poor, and the combustion intensity cannot be increased.

The internal structure of the burner 100 according to embodiments of the present disclosure is newly designed, and has been theoretically optimized and improved. In addition to the internal gas channel 202, an external gas channel 203 is provided in the burner 100. In this case, the internal gas channel 202 may be used for primary air supply, and the external gas channel 203 may be used for secondary air supply. The air for combustion may be both primary air and secondary air, thereby intensifying combustion and improving combustion conditions, and improving combustion performance. The burner 100 according to embodiments of the present disclosure has a faster combustion speed, so that the temperature of the top of the burner unit 20 may be lower, and the entire load may be increased. At the same time, the secondary air may have a cooling effect on the burner unit 20, which is conducive to lowering the temperature of the top of the burner unit 20, thereby further increasing the load.

Studies have indicated that the burner 100 according to the embodiments of the present disclosure can enhance the combustion intensity by 50%, which is conducive to reducing the burner volume. At the same time, the air ratio is reduced, and the combustion performance is more stable. Due to the flow of secondary air, nitrogen oxides can decrease instead. In addition, the combustion intensity of the burner unit 20 is increased, which increases the load of the entire machine. With the same load, the cost of the entire apparatus can be reduced.

In some embodiments, the burner 100 may employ a gas-guiding device, such as a fan, to increase the air flow velocity. The suction force of the fan may be changed from primary air to secondary air, thereby increasing the overall combustion air volume, and enhancing the overall combustion intensity, and allowing the combustion to be more stable.

According to some embodiments of the present disclosure, each burner unit 20 has an excess air coefficient of a, and a combustion power of P, where 0.9 < a < 1.0 and 2.8KW < P < 3.2KW. Through a large number of experiments, the excess air coefficient of the atmospheric burner 100 is too large, and the flame is extremely unstable, especially for the water-cooled structure, whose fire hole is formed through a planar process, and which originally has no stable flame and extremely poor flame performance. Therefore, when the excess air coefficient of the burner 100 is controlled to be a = 0.9 to 1.0, the combustion effect is better. In terms of the load of the single piece, due to the introduction of a large amount of secondary air, the water cooling effect is optimized, and the load of the single piece can be strengthened up to 2.8 to 3.2 KW.

3 , in some embodiments of the present disclosure, a plurality of burner units 20 may be provided. The plurality of burner units 20 may be sequentially arranged in a horizontal direction, for example, in a left-right direction, as illustrated in FIG. 1 , or in other directions, such as in a front-rear direction. Along an arrangement direction of the plurality of burner units 20, the external gas channel 203 is provided on at least one side of each burner unit 20. In other words, the external air channel 203 may be defined on only one side of the burner unit 20 along the arrangement direction, or the external air channel 203 may be defined on both sides of the burner unit 20 along the arrangement direction. Such an arrangement of the external gas channel 203 is more reasonable and convenient for implementation as well as arrangement of the burner unit 20.

According to some embodiments of the present disclosure, as illustrated in Figure 2 and Figure 3, the external gas channel 203 may be disposed between two adjacent burner units 20 and shared by these two adjacent burner units 20. In other words, two adjacent burner units 20 can share the external gas channel 203 located between these two burner units 20, without the need to separately provide their own external gas channels 203. Thereby, the utilization of the internal space of the burner 100 can be improved, which is favorable to further reducing the volume of the burner 100, and two adjacent burner units 20 can have a relatively small space between them, thereby improving the overall combustion effect of the burner 100.

According to some embodiments of the present disclosure, along the arrangement direction of the plurality of burner units 20, the minimum extension size of each external gas channel 203 may be smaller than the minimum extension size of the internal gas channel 202. Taking Figure 3 as an example, the plurality of burner units 20 are arranged in the left-right direction. Along the left-right direction, the minimum extension size of each external gas channel 203 in the left-right direction may be smaller than the minimum extension size of the internal gas channel 202 in the left-right direction. Thereby, the ratio between the primary air and the secondary air can be controlled more reasonably, which is favorable to further improve the combustion performance and can stabilize the flame.

Referring to Figure 1 through Figure 3, in some embodiments of the present disclosure, the burner unit 20 may comprise a burner top plate 21 and a burner side plate 22. The fire combustion port 201 may be defined in the burner top plate 21. The burner side plate 22 is connected to the burner top plate 21, and the internal gas channel 202 is defined by the burner side plate 22 and the burner top plate 21. When a plurality of burner units 20 are provided and the external gas channel 203 is provided between two adjacent burner units 20, the external gas channel 203 provided between the two adjacent burner units 20 may be formed by spacing at least two adjacent burner side plates 22, and the external gas channel 203 provided between the burner unit 20 and the casing 10 may be formed by spacing at least the burner side plate 22 and the casing 10.

For example, in some specific embodiments, the burner top plate 21 is inserted into an upper portion of the burner side plate 22 to cover the upper portion of the burner side plate 22, and the external gas channel 203 between two adjacent burner units 20 is formed by spacing the adjacent burner side plates 22 of these two adjacent burner units 20. For example, in some other specific embodiments, the burner top plate 21 is lined on the upper portion of the burner side plate 22 to cover the upper portion of the burner side plate 22. The external gas channel 203 between two adjacent burner units 20 is formed by spacing the adjacent burner side plates 22 and the burner top plates 21 of these two adjacent burner units 20.

According to some specific examples of the present disclosure, as illustrated in Figure 3, the external gas channel 203 is provided between every two adjacent burner units 20, and the external gas channel 203 is also located between the outermost burner unit 20 and the casing 10. In this case, along the arrangement direction of the plurality of burner units 20, the external gas channels 203 and the burner units 20 may be arranged alternately. Studies have indicated that such a structure has a better effect in improving combustion and improving the efficiency of the latter.

In some other specific examples, the external gas channel 203 and the burner unit 20 are not arranged alternately. For example, they are arranged such that an external gas channel 203, a burner unit 20, a burner unit 20, an external gas channel 203, a burner unit 20, a burner unit 20, an external air channel 203, and the like. In this case, two adjacent burners 100 may be connected to each other and be spaced apart from the other two connected burner units 20. Regarding such a structure, each burner unit 20 can perform replenishment of primary air and secondary air, and can also enhance combustion and improve combustion performance.

In some embodiments, referring to Figure 2 and Figure 3, the burner top plate 21 may be arranged and configured to cover an upper portion of the burner side plate 22, and the burner top plate 21 may be provided with a downwardly extending outer flange 211, and the outer flanges 211 of two adjacent burner top plates 21 may be spaced apart from each other to define an outlet of the external air channel 203. The outer flange 211 not only has the effect of reinforcing the burner unit 20, but also may guide the gas flow upward, which is favorable for further improving the performance of the burner 100.

Referring further to Figure 2 and Figure 3, the burner side plates 22 may comprise a first side plate 221 and a second side plate 222. The first side plate 221 and the second side plate 222 are horizontally spliced to form a hollow structure extending in the up-down direction. That is, the first side plate 221 and the second side plate 222 are horizontally distributed and spliced to form a structure, which may be a hollow structure extending in the up-down direction. The burner top plate 21 may be arranged on and configured to cover an upper part of the hollow structure.

The external gas channel 203 provided between two adjacent burner units 20 may be defined by at least spacing the first side plate 221 and the second side plate 222 that are adjacent to each other. The external gas channel 203 provided between the burner unit 20 and the housing 10 may be defined by at least spacing the housing 10 and one of the first side plate 221 and the second side plate 222, which is adjacent to the housing. For example, for the leftmost burner unit 20, if the first side plate 221 thereof is arranged on the left side, the first side plate 221 adjacent to the housing 10 is spaced from the housing 10 to define the external gas channel 203. For the rightmost burner unit 20, if the second side plate 222 thereof is arranged on the right side, the second side plate 222 adjacent to the casing 10 is spaced from the casing 10 to define the external gas channel 203. The second side plate 222 of the left-hand side burner unit 20 and the first side plate 221 of the right-hand side burner unit 20 may be spaced from each other to define the external gas channel 203 provided between these two adjacent burner units 20. Such a structure is easier to manufacture and has a higher structural stability.

Referring to Figure 1 through Figure 3, in some embodiments of the present disclosure, the burner 100 further comprises a liquid cooling pipe 30, and the liquid cooling pipe 30 extends within the housing 10. The liquid cooling pipe 30 may be proximate the burner unit 20, or the liquid cooling pipe 30 may be connected to the burner unit 20.

In this way, the liquid cooling pipe 30 can exchange heat with the burner unit 20 to directly cool the burner unit 20. When burning in the fire combustion hole 201, the heat generated by radiation is transferred to the burner unit 20 and indirectly exchanges heat with the liquid cooling pipe 30. At the same time, air, in the form of cold air, is supplied from a lower side of the burner unit 20 to form an air cooling effect, which is favorable to improve the liquid cooling effect. In other words, the air, after passing through the liquid cooling pipe 30, can be turned into cold air, and thus air can be provided for combustion, while cooling the burner unit 20 and cooling the flame at the same time. In this way, the temperature in the area surrounding the burner unit 20 is lowered and a stronger air cooling effect is created, thereby enhancing the water cooling effect, and further increasing the burner load.

As illustrated in Figure 2 and Figure 3, the liquid cooling pipe 30 is closer to the fire combustion hole 201 than an inlet of the internal gas channel 202. In this case, the liquid cooling pipe 30 may be arranged at the top of the burner unit 20. The liquid cooling pipe 30 can cool the top of the burner 100 with a higher temperature, thereby improving the cooling effect. In some specific examples of the present disclosure, the liquid cooling pipe 30 is a water cooling pipe.

5 , in some embodiments of the present disclosure, the air inlet 102 may comprise a first air inlet 1021 and a second air inlet 1022, and the inner gas channel 202 may be in communication with the first air inlet 1021 to introduce gas into the inner gas channel 202 through the first air inlet 1021. The second air inlet 1022 may be in communication with the outer gas channel 203, so that gas may be introduced into the outer gas channel 203 through the second air inlet 1022. The air inlet of the inner gas channel 202 may be separated from the air inlet of the outer gas channel 203, thereby reducing interference between these two channels, improving the air inlet effect, and improving combustion performance.

In some embodiments of the present disclosure, the burner 100 may have a first combustion mode and a second combustion mode, and a combustion power of the burner 100 in the first combustion mode may be smaller than a combustion power of the burner 100 in the second combustion mode. The second air inlet 1022 may not introduce gas into the external gas channel 203 in the first combustion mode and may introduce gas into the external gas channel 203 in the second combustion mode.

Therefore, in the first combustion mode with a relatively low combustion power, gas such as primary air and fuel gas can be introduced through the internal gas channel 202, and the fuel gas can be burned in the burner unit 20 under the supply of the primary air. In the second combustion mode with a relatively low combustion power, gas such as secondary air can be introduced through the internal gas channel 202 as well as through the external gas channel 203. In the burner unit 20, the fuel gas can be burned in the fire combustion hole 201 under the supply of primary air and secondary air.

It can be understood that, in order to facilitate the introduction of gas, an injection structure for injecting gas into the internal gas channel 202 may be arranged at an inlet end of the internal gas channel 202. For example, a nozzle for injecting combustible gas into the internal gas channel 202 is arranged at the inlet end of the internal gas channel 202. In this case, the internal gas channel 202 may be constituted as a channel based on the principle of atmospheric natural injection combustion. When the combustible gas is injected from the nozzle into the internal gas channel 202, primary air injection is performed in a throat of the internal gas channel 202, and the primary air may enter the internal gas channel 202 under the effect of the injection. During the upward flow of the gas, the combustible gas and the primary air will be fully mixed, and combustion will occur in the fire combustion hole 201. In Figure 3, A represents an ignited inner flame, and B represents an injected combustible gas. In the above structure, the stability of the internal combustion flame generated in the fire combustion hole 201 is determined by the primary air. During intensified combustion, only the secondary air is increased, but the primary air is slightly reduced, which is more favorable to ensure the stability of combustion.

As illustrated in Figure 1, the top of the burner unit 20 has a width direction and a length direction that are perpendicular to each other in a horizontal direction. In the illustrated example of Figure 1, the width direction is the left-right direction, and the length direction is the front-rear direction. Along the width direction, two outlets of the external gas channels 203 are provided on two sides of the burner unit 20, respectively. The two outlets extend in the length direction, respectively, and the two outlets are not in communication with each other.

The burner housing 10 of the burner 100 according to embodiments of the present disclosure will be described below in conjunction with some embodiments of the present disclosure. The housing 10 provides a completely new burner structure, which can effectively provide the burner unit 20 with the air necessary for combustion and control the air necessary for combustion.

As illustrated in Figure 4 and Figure 5, the casing 10 according to embodiments of the present disclosure may comprise a side enclosing plate 11 and an air distribution plate 12. The side enclosing plate 11 may enclose and form an installation space penetrating in the up-down direction, and the side enclosing plate is configured to be installed with the burner unit 20 of the burner 100. The air distribution plate 12 may be sealed at a lower end opening of the installation space, the air distribution plate 12 may be located above the burner unit 20, and a casing cavity 101 may be defined by the air distribution plates 12 and the side wall 11.

As illustrated in Figure 5 and Figure 6, the air distribution plate 12 is provided with first air inlets 1021 and second air inlets 1022. The first air inlet 1021 is in communication with the internal gas channel 202 in the burner unit 20 to introduce gas into the internal gas channel 202 through the first air inlet 1021. The external gas channel 203 located at a side portion of the burner unit 20 is in communication with the second air inlet 1022 to introduce gas into the external gas channel 203 through the second air inlet 1022. The first air inlet 1021 and the second air inlet 1022 are spaced apart from each other to reduce interference between the external gas channel 203 and the internal gas channel 202.

Since the casing 10 of the burner 100 according to embodiments of the present disclosure has the side enclosing plate 11 and an air distribution plate 12, air distribution and control can be achieved, the air distribution plate 12 can finely distribute the air to optimize the combustion and improve the combustion, and the burner unit 20 can be restricted inside, allowing the burner unit 20 to have a stable and reliable installation position. When combustion occurs in the burner unit 20, gas can be supplied through the internal gas channel 202, and gas can be supplemented through the external gas channel 203, allowing the air utilization rate to be close to 100%, thereby improving the combustion effect, improving the combustion conditions, and improving the combustion performance. In some embodiments, the combustion intensity can be increased by 50%. At the same time, the casing 10 can play a role of general collecting and transporting, which is favorable to reducing costs and volume.

In embodiments of the present disclosure, the number of burner units 20 arranged in the housing is not specifically limited, which may be one or more. For example, in the embodiments illustrated in Figure 1 to Figure 3, a plurality of burner units 20 may be arranged in the installation space, and the plurality of burner units 20 may be arranged sequentially along the left-right direction. A plurality of first air inlets 1021 may be provided, and a plurality of second air inlets 1022 may be provided. The plurality of first air inlets 1021 and the plurality of second air inlets 1022 may be arranged alternately along the arrangement direction, that is, the plurality of first air inlets 1021 and the plurality of second air inlets 1022 are arranged alternately in the left-right direction. The second air inlet 1022 is arranged between two adjacent first air inlets 1021, and the first air inlet 1021 is arranged between two adjacent second air inlets 1022. The plurality of first air inlets 1021 are in communication with the internal gas channels 202 of the plurality of burner units 20 in a one-to-one correspondence. In this way, gas can be introduced into the internal gas channel 202 of each burner unit 20 through the corresponding first air inlet 1021, thereby improving the gas flow effect.

In some embodiments, as illustrated in Figure 5 and Figure 6, each first air inlet 1021 may comprise a plurality of air holes 1020, and the plurality of air holes 1020 may be spaced apart from each other along the front-to-rear direction. Thereby, the air inlet can be dispersed, and this structure is more compatible with the structure of the burner unit 20 in some embodiments, for example, the air holes 1020 correspond to the air distribution rods of the burner unit 20 in a one-to-one correspondence, thereby improving the air distribution effect.

As illustrated in Figure 6, the second air inlet 1022 may extend along the front-rear direction to form a long strip shape. The second air inlet 1022 comprises first sections 1023 and second sections 1024, which are alternately arranged along the front-rear direction and in communication with each other. A width of the first section 1023 in the left-right direction is smaller than a width of the second section 1024 in the left-right direction. Along the front-rear direction, the first section 1023 corresponds to a position of the air hole 1020, and the second section 1024 is located between two adjacent air holes 1020. This structural arrangement is more reasonable, which not only facilitates the installation of the burner unit 20 and the air distribution plate 12, but also makes the opening of the second air inlet 1022 relatively larger, which is favorable for increasing an air intake volume.

Referring further to Figure 6, the air hole 1020 may be a round hole, which is more favorable for air intake. In some embodiments, it is convenient to place a nozzle in the round hole, which is favorable for uniform gas injection.

According to some embodiments of the present disclosure, as illustrated in Figure 1, the side enclosing plate is provided with a separation structure 40 for separating the plurality of burner units 20, which can not only improve the installation reliability of the burner units 20, but also can be beneficial for separating the plurality of burner units 20 with a predetermined interval. The burner units 20 are positioned and spaced with a certain interval, so as to form a stable and reliable combustion structure. The specific structure of the separation structure 40 is not specifically limited in the present disclosure, as long as it can satisfy the function of separating the plurality of burner units 20.

5, in some embodiments of the present disclosure, the separation structure 40 may comprise a separation flange 41, and the separation flange 41 is arranged at an upper end of the side enclosure plate 11 and extends into the installation space. The separation flange 41 may be placed between two adjacent burner units 20. Thus, two adjacent burner units 20 can be separated by the separation flange 41, the separation effect is good, and it is convenient to arrange the separation structure 40.

According to some embodiments of the present disclosure, an outlet of the external gas channel 203 may be defined between the tops of two adjacent burner units 20. A front edge and a rear edge of the upper end of the side enclosing plate 11 are respectively provided with the separating flanges 41, and the two separating flanges 41 cooperate with the burner unit 20 to separate two adjacent outlets. In other words, the separating flange 41 may cooperate with each burner unit 20 to separate the outlets of the external gas channels 203 located on both sides of the burner unit 20. In this way, the burner 100 forms a stable ignition at both ends of the burner unit 20, and after passing through the fire, it may coincide with the first air inlet 1021 of the air distribution plate 12 to introduce primary air, which is more favorable for overall performance control.

As illustrated in Figure 4, Figure 5 and Figure 7, each separation flange 41 may comprise a plurality of separation tabs 411, and the plurality of separation tabs 411 may be arranged along the left-right direction. Two adjacent burner units 20 may be separated by the separation tab 411. Specifically, during manufacturing, the shape of the separation tab 411 may be matched with the shape of the joint between the burner units 20, which is more convenient for manufacturing and has a good separation effect on the burner units 20.

According to some embodiments of the present disclosure, referring to Figure 1 and Figure 4, a burner unit 20 may be disposed between every two spacing tabs 411, and the roots of two adjacent spacing tabs 411 are spaced apart from each other to define a spacing gap 401. The spacing gap 401 can position the burner unit 20 in the up-down direction, so that the burner unit 20 can be accurately installed in the up-down direction, reducing the occurrence of tilting, and the burner units 20 are relatively fixed and stable without being affected by transportation bumps or impacts, and thus the performance of the burner 100 is more stable.

Furthermore, in addition to the separation gap 401, the burner unit 20 may be positioned by other structures. Referring to Figure 1, Figure 4 and Figure 7, in some embodiments of the present disclosure, the side enclosing plate 11 is further provided with a positioning structure 50, and the positioning structure 50 may be configured to position the burner units 20 in the up-down direction. In some embodiments, the positioning structure 50 may comprise a positioning hole 51 extending in the up-down direction along the side enclosing plate 11, and the burner unit 20 may extend into the positioning hole 51 to engage with the positioning hole 51, thereby being positioned in the up-down direction. Thus, the positioning effect is good, and the burner unit 20 can be installed more reliably.

According to some embodiments of the present disclosure, at least one of a front side and a rear side of the installation space may be provided with the positioning hole 51, and each burner unit 20 may correspond to at least two positioning holes 51. Thus, the burner units 20 can be positioned through the positioning holes 51, improving the positioning effect. In some embodiments, the two positioning holes 51 may be arranged on a same side of the casing 10 or on different sides of the casing 10, which can be flexibly adjusted according to actual conditions.

As illustrated in Figure 7 and Figure 10, a lower end of the side enclosing plate 11 may be provided with a positioning flange 1101, and the positioning flange 1101 extends into the installation space. The positioning flange 1101 may be configured to position a lower portion of the burner unit 20. Thereby, the installation reliability and accuracy of the burner unit 20 can be further improved.

Referring to Fig. 1, Fig. 4, Fig. 7, and Fig. 8, an upper part of the side enclosing plate 11 is provided with a mounting portion 60, and the mounting portion 60 can be used to mount an ignition needle 610. Thereby, the side enclosing plate 11 can enable the ignition needle 610 and the burner unit 20 to have a stable and accurate position for ignition and feedback, which is favorable for improving the combustion effect. The specific structure of the mounting portion 60 is not limited in the present disclosure. In some embodiments, the mounting portion 60 may be a mounting hole, a threaded fastener may penetrate the mounting hole to connect the ignition needle 610 and the side enclosing plate 11, and the mounting structure is reliable and easy in terms of installation and operation.

The connection between the air distribution plate 12 and the side enclosure plate 11 is not specifically limited in the present disclosure. In some embodiments of the present disclosure, the front and rear ends or the left and right ends of the air distribution plate 12 may be connected to the side enclosure plate 11 through threads, and the other two ends of the air distribution plate 12 may abut against the side enclosure plate 11. In other words, the front and rear ends of the air distribution plate 12 may be connected to the side enclosure plate 11 through threads, and the left and right ends of the air distribution plate 12 may abut against the side enclosure plate 11; or the left and right ends of the air distribution plate 12 may be connected to the side enclosure plate 11 through threads, and the front and rear ends of the air distribution plate 12 may abut against the side enclosure plate 11. This structure is not only more reliable in connection, but also more convenient in terms of installation and operation.

5 , according to some embodiments of the present disclosure, the side enclosing plate 11 may comprise a front side plate 111, a rear side plate 112, a left side plate 113, and a right side plate 114. The front side plate 111 and the rear side plate 112 are spaced apart from each other in the front-rear direction. The left side plate 113 is disposed on a left side of the front side plate 111, a front edge of the left side plate 113 is connected to a left edge of the front side plate 111, and a rear edge of the left side plate 113 is connected to a left edge of the rear side plate 112. The right side plate 114 is arranged on a right side of the front side plate 111, a front edge of the right side plate 114 is connected to a right edge of the front side plate 111, and a rear edge of the right side plate 114 is connected to a right edge of the rear side plate 112. A lower end of the front side plate 111, a lower end of the rear side plate 112, a lower end of the left side plate 113, and a lower end of the right side plate 114 are all connected to the air distribution plate 12. In this way, the side enclosing plate 11 (the front side plate 111, the right side plate 114, the left side plate 113, and the right side plate 114) and the air distribution plate 12 can enclose and define a frame structure having an opening at an upper end, and the burner units 20 can be stably installed on the frame structure.

According to some embodiments of the present disclosure, adjacent edges of the front side plate 111, the rear side plate 112, the left side plate 113, and the right side plate 114 may be connected by threaded fasteners. For example, as illustrated in Figure 4 and Figure 5, the left and right edges of the front side plate 111, as well as the left and right edges of the rear side plate 112, may each be provided with a mounting flange, and screw holes may be defined in the mounting flanges. Thereby, the strength of the front side plate 111 and the rear side plate 112 can be strengthened, and the installation reliability and sealing performance can be improved.

As illustrated in Figure 5, Figure 7 and Figure 8, on the front side plate 111 and the rear side plate 112, the separation gap 401 and two positioning holes 51 are provided from the top to the bottom on the same vertical line along the up-down direction, which can strictly control the combustible gas.

A water heating apparatus according to embodiments of the present disclosure comprises the burner 100 according to embodiments of the present disclosure, or the housing 10 of the burner 100 according to embodiments of the present disclosure. The hot water performance of the water heating apparatus according to embodiments of the present disclosure is improved.

Claims (14)

1. A burner (100), comprising: a housing (10) defining a housing cavity (101), wherein an air inlet (102) is defined in a lower portion of the housing (10)1 and a combustion port (103) is defined in an upper portion of the housing (10), and the air inlet (102) and the combustion port (103) are in communication with the housing cavity (101); and at least one burner unit (20) disposed in the casing cavity (101), wherein a fire combustion hole (201) exposed from the combustion port (103) is defined in an upper part of each of the at least one burner unit (20), and an internal gas channel (202) is defined in each of the at least one burner unit (20) to allow a part of the air entering from the air inlet (102) to flow into the fire combustion hole (201) through the internal gas channel (202), wherein the burner (100) has an external gas channel (203) provided on an outer side surface of each of the at least one burner unit (20), the external gas channel (203) being in communication with the air inlet (102) and the combustion port (103) to allow another part of the air entering the air inlet (102) to flow into the fire combustion hole (201) through the external gas channel (203), wherein the housing (10) comprises: a side enclosing plate (11), in which an installation space penetrating in the up-down direction is enclosed by the side enclosing plate (11), allowing a burner unit (20) of the burner (100) to be installed in the installation space; an air distribution plate (12) disposed in and sealing a lower end opening of the installation space and configured to be positioned below the burner unit (20), characterized in that a first air inlet (1021) and a second air inlet (1022) for air intake are defined in the air distribution plate (12) and spaced apart from each other, wherein the first air inlet (1021) is in communication with the internal gas channel (202) in the burner unit (20), the second air inlet (1022) is in communication with the external gas channel (203) located at a side portion of the burner unit (20)2. 2. The burner (100) according to claim 1, wherein the at least one burner unit (20) comprises a plurality of burner units (20) sequentially arranged in a horizontal direction, and along an arrangement direction of the plurality of burning units (20), each of the plurality of burner units (20) has the external gas channel (203) provided on at least one side thereof, preferably, the external gas channel (203) is provided between and shared by two adjacent burner units (20) of the plurality of burner units (20). 3. The burner (100) according to claim 1 or 2, wherein the burner unit (20) comprises: a burner top plate (21), wherein the fire combustion hole (201) is provided in the burner top plate (21); and a burner side plate (22) connected to the burner top plate (21), wherein the internal gas channel (202) is defined by the burner top plate (21) and the burner side plate (22), the external gas channel (203) provided between two adjacent burner units (20) is formed at least by the spacing of two adjacent burner side plates (22), and the external gas channel (203) provided between the burner unit (20) and the casing (10) is formed at least by the spacing of the burner side plate (22) and the casing (10). 4. The burner (100) according to claim 3, wherein the burner top plate (21) is arranged on and covers an upper part of the burner side plate (22), the burner top plate (21) is provided with an outer flange (211) extending downward, and an outlet of the external gas channel (203) is formed by outer flanges (211) spaced apart from two adjacent burner top plates (21). 5. The burner (100) according to claim 3 or 4, wherein the burner side plate (22) comprises a first side plate (221) and a second side plate (222), the first side plate (221) and the second side plate (222) are horizontally spliced to form a hollow structure extending in an up-down direction, the burner top plate (21) is arranged in and covers an upper part of the hollow structure, the external gas channel (203) provided between two adjacent burner units (20) is formed by at least spacing the first side plate (221) and the second side plate (222) which are adjacent to each other, and the external gas channel (203) provided between the burner unit (20) and the casing (10) is formed by at least spacing the casing (10) and the first side plate (221) or the second side plate (222) which is adjacent to the casing (10). (10). 6. The burner (100) according to any one of claims 1 to 5, further comprising a liquid cooling pipe (30) extending towards the casing (10), wherein the liquid cooling pipe (30) is close to the at least one burner unit (20) or is connected to the at least one burner unit (20), and the liquid cooling pipe (30) is closer to the fire combustion hole (201) than an inlet of the internal gas channel (202). 7. The burner (100) according to one of the preceding claims, wherein the installation space is configured to accommodate a plurality of burner units (20) sequentially arranged along a left-right direction, a plurality of the first air inlets (1021) and a plurality of the second air inlets (1022) are provided, the plurality of the first air inlets (1021) and the plurality of the second air inlets (1022) are arranged alternately along the arrangement direction of the plurality of burner units (20), the plurality of the first air inlets (1021) being in communication with the internal gas channels (202) of the plurality of burner units (20) in one-to-one correspondence. 8. The burner (100) according to one of the preceding claims, wherein the side enclosing plate (11) comprises: a front side plate (111); a rear side plate (112), wherein the front side plate (111) and the rear side plate (112) are spaced apart from each other in a front-rear direction; a left side plate (113) disposed on a left side of the front side plate (111), wherein a front edge and a rear edge of the left side plate (113) are respectively connected to a left edge of the front side plate (111) and a left edge of the rear side plate (112); a right side plate (114) disposed on a right side of the front side plate (111), wherein a front edge and a rear edge of the right side plate (114) are respectively connected to a right edge of the front side plate (111) and a right edge of the rear side plate (112), wherein two of a lower end of the front side plate (111), a lower end of the rear side plate (112), a lower end of the left side plate (113), and a lower end of the right side plate (114) abut against the air distribution plate (12), the other two of the lower end of the front side plate (111), the lower end of the rear side plate (112), the lower end of the left side plate (113), and the lower end of the right side plate (114) are connected to the air distribution plate (12) through threads. 9. The burner according to one of the preceding claims, wherein the side enclosing plate (11) is provided with a separation structure (40) for separating the plurality of burner units (20), the separation structure (40) comprises a separation flange (41) disposed at an upper end of the side enclosing plate (11) and the separation flange (41) extending into the installation space, and the separation flange (41) is configured to abut between two adjacent burner units (20) of the plurality of burner units (20). 10. The burner (100) according to one of the preceding claims, wherein an outlet of the external gas channel (203) is defined between upper parts of two adjacent burner units (20), a front edge and a rear edge of the upper end of the side enclosing plate (11) are respectively provided with the separating flanges (41), two of the separating flanges (41) cooperate with the plurality of burner units (20) to separate two adjacent outlets. 11. The burner (100) according to one of the preceding claims, wherein each of the spacing flanges (41) comprises a plurality of spacing tabs (411) arranged along the left-right direction, two adjacent burner units (20) of the plurality of burner units (20) are separated by one of the plurality of spacing tabs (411); one burner unit (20) of the plurality of burner units (20) is arranged between each two spacing tabs (411) of the plurality of spacing tabs (411), the roots of the two adjacent spacing tabs (411) are spaced apart from each other to define a spacing gap (401) for positioning the burner unit (20) in the up-down direction. 12. The burner (100) according to one of the preceding claims, wherein the side enclosing plate (11) is further provided with a positioning structure (50) for positioning the burner unit (20) in the up-down direction, the positioning structure (50) comprising positioning holes (51) extending along the up-down direction in the side enclosing plate (11); at least one of a front side surface and a rear side surface of the installation space is provided with the positioning holes (51), each burner unit (20) corresponding to at least two positioning holes (51). 13. The burner (100) according to one of the preceding claims, wherein a lower end of the side enclosing plate (11) is provided with a positioning flange (1101) extending in the installation space and configured to position a lower part of the burner unit (20). 14. A water heating apparatus, comprising a burner (100) according to any one of claims 1 to 13.