CN114688736B - Noise reduction device and gas water heater - Google Patents

Abstract

The application relates to the technical field of burners, and provides a noise reduction device and a gas water heater. Among the above-mentioned noise reduction device, this noise reduction device includes the casing at least, produce the frequency characteristic of noise when according to gas heater air inlet, set up first amortization spare along the air inlet direction in the casing, second amortization spare and third amortization passageway, be formed with first amortization passageway, second amortization passageway and the third amortization passageway of intercommunication in proper order respectively, set up amortization passageway through segmentation, and combine first clearance passageway that sets up, the second clearance passageway, porous sound absorption layer and sound absorption wedge, on the angle of the noise of different frequencies is absorbed from improving resonant frequency and layer by layer, make the airflow noise loop through first amortization passageway, after second amortization passageway and the third amortization passageway, thereby reduced airflow noise, promote the comfort level that the user used layer by layer.

Description

Noise reduction device and gas water heater

Technical Field

The application relates to the technical field of burners, in particular to a noise reduction device and a gas water heater.

Background

In the related art, when the gas water heater is used for air intake, high-speed air flow can be generated in the air intake channel, friction and resistance are generated between the air flow and the air intake channel due to relative movement, so that the air flow is subjected to severe vibration, and noise is generated.

Disclosure of Invention

Accordingly, it is necessary to provide a noise reducing device and a gas water heater to reduce noise generated when the gas water heater is air-fed.

According to one aspect of the present application, an embodiment of the present application provides a noise reduction device for an air inlet of a gas water heater, including:

the shell is provided with a containing cavity, one end of the shell is provided with an air inlet, the other end of the shell is provided with an air outlet, the air inlet and the air outlet are respectively communicated with the containing cavity, and

The first silencing piece, the second silencing piece and the third silencing piece are sequentially arranged in the accommodating cavity along the air inlet direction, a first silencing channel communicated with the air inlet is formed in the first silencing piece, a second silencing channel is formed in the second silencing piece, a third silencing channel communicated with the air outlet is formed in the third silencing piece, and the first silencing channel, the second silencing channel and the third silencing channel are sequentially communicated to form the air inlet channel;

the cross section area of the second silencing channel is larger than the cross section area of the first silencing channel and the cross section area of the third silencing channel along the air inlet direction, and step surfaces are respectively formed at the joint of the first silencing channel and the second silencing channel and the joint of the second silencing channel and the third silencing channel;

A first clearance channel is defined between the first silencing piece and the shell, and a second clearance channel is defined between the second silencing piece and the shell;

the first silencing piece is provided with a plurality of first through holes which are communicated with the first silencing channel and the first clearance channel, and the second silencing piece is provided with a plurality of second through holes which are communicated with the second silencing channel and the second clearance channel.

In the noise reduction device, the noise reduction device at least comprises a shell, according to the frequency characteristic of noise generated when the gas water heater is used for air intake, a first silencing piece, a second silencing piece and a third silencing piece are arranged in the shell along the air intake direction, a first silencing channel, a second silencing channel and a third silencing channel which are communicated in sequence are respectively formed, the cross section area of the second silencing channel is larger than that of the first silencing channel and that of the third silencing channel, and step surfaces are formed at the joint of the first silencing channel and the second silencing channel and the joint of the second silencing channel and the third silencing channel respectively, so that the joint is a sudden change cross section, and the noise can be reflected at the sudden change to be attenuated. Therefore, the first silencing channel can reduce the noise of the high frequency band, the second silencing channel can reduce the noise of the middle and low frequency bands, and the third silencing channel can further reduce the noise of the low frequency band. Meanwhile, as the first clearance channel is defined between the first silencing piece and the shell, the second clearance channel is defined between the second silencing piece and the shell, and the structure is combined, the first clearance channel can further strengthen the reduction of the noise of the high frequency band in the first silencing channel, and the second clearance channel can further strengthen the reduction of the noise of the middle and low frequency bands in the second silencing channel. Therefore, the air flow noise generated during the air inlet of the gas water heater is subjected to layer-by-layer silencing and gradual attenuation, so that the noise is reduced, and the comfort level of a user is improved.

In one embodiment, the noise reduction device further comprises a porous sound absorbing layer disposed between the first sound attenuating member and the housing;

The porous sound absorbing layer and the first sound attenuating member define the first clearance passage therebetween. Thus, due to the arrangement of the porous sound absorption layer, the acoustic resistance is increased, so that the noise frequency band which can be absorbed by the first silencing channel structurally is wider.

In one embodiment, the noise reduction device further comprises a plurality of sound absorption wedges arranged in the third silencing channel;

The sound absorption wedge is provided with a base part and a wedge part opposite to the base part, the base part is arranged on the side wall of the third silencing channel, and the wedge part extends away from the side wall. Therefore, through the arrangement of the sound absorption wedge, the acoustic impedance between the air and the sound absorption material is gradually transited, and good impedance matching and sound absorption effects are obtained.

In one embodiment, the length of the split is L1 and the length of the base is L2 along the extension direction of the split;

Wherein the ratio of L1 to L2 is 4. Therefore, the rigidity of the skeleton of the sound absorption wedge can be ensured, and meanwhile, the sound absorption performance is improved.

In one embodiment, a plurality of the sound absorbing wedges are arranged around a side wall of the third sound deadening passageway. Thus, the absorption effect of the third silencing channel on low-frequency noise is further improved.

In one embodiment, the sound absorbing wedge comprises a flat-head wedge. Thus, the space in the third silencing channel can be saved while better absorption effect is realized.

In one embodiment, the third sound attenuating member is constructed of a porous sound absorbing material. Thus, the noise absorbing effect can be further improved.

In one embodiment, the aperture of the first through hole is d1, the thickness of the first silencing member is t1, the thickness of the first clearance channel is h1, the area ratio of the sum of the areas of the plurality of first through holes to the first silencing member is P1, and the following conditions are satisfied:

3mm≤d1≤3.5mm;

1mm≤t1≤1.5mm;

5mm≤h1≤10mm;

0.04≤P1≤0.05。

thus, the first sound deadening passage can be made wider in the noise band that can be structurally absorbed.

In one embodiment, the aperture of the second through hole is d2, the thickness of the second silencing member is t2, the thickness of the second clearance channel is h2, the area ratio of the sum of the areas of the plurality of second through holes to the second silencing member is P2, and the following conditions are satisfied:

2.5mm≤d2≤3mm;

2mm≤t2≤3mm;

30mm≤h2≤35mm;

0.025≤P2≤0.03。

therefore, the second silencing channel can be made to be better in structure for absorbing intermediate frequency noise.

In one embodiment, a plurality of the first through holes are arranged in a first unit pattern repeatedly formed, the first unit pattern comprising one of a triangle, a rectangle, and/or

The plurality of second through holes are arranged in a second unit pattern repeatedly formed, and the second unit pattern comprises one of a triangle and a rectangle. In this way, the desired resonance frequency can be achieved to better absorb noise.

In one embodiment, the extending directions of the plurality of the first through holes are parallel to each other, and/or

The extending directions of the plurality of second through holes are parallel to each other. In this way, the desired resonance frequency can be achieved to better absorb noise.

In one embodiment, the noise reduction device further comprises a diversion channel connected between the air inlet and the first silencing channel;

Along the air inlet direction, the cross-sectional area of the diversion channel is reduced. In this way, the air is conveniently guided into the first silencing channel.

In one embodiment, the first silencing member is of a unitary or split construction with the housing. In this way, manufacturing or installation is facilitated as desired.

In one embodiment, the noise reduction device further comprises a bellows;

The air outlet is communicated with an air inlet of the gas water heater by means of the corrugated pipe. Thus, the generation of a fluid boundary layer can be destroyed, and the air inlet resistance is reduced.

According to another aspect of the application, the application provides a gas water heater, which comprises the noise reduction device, wherein the noise reduction device is arranged at the air inlet of the gas water heater. Therefore, the noise generated when the gas water heater is used for air intake can be reduced, and the use experience of a user is improved.

Additional aspects and advantages of embodiments of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the application.

Drawings

FIG. 1 is a schematic diagram of an exploded structure of a noise reduction device according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a noise reduction device according to an embodiment of the present application;

FIG. 3 is a schematic view of a sound absorbing wedge in one implementation of an embodiment of the present application;

FIG. 4 is a schematic diagram of a first via arrangement in an embodiment of the present application;

FIG. 5 is a schematic diagram of a first via arrangement in another embodiment of the present application;

fig. 6 is a schematic diagram of a first via arrangement in a further embodiment of the present application.

Reference numerals simply denote:

a housing 100, an air inlet 110, an air outlet 120;

a first muffler 200, a first muffler channel 201, a first clearance channel 202, a flow guide channel 203, a first through hole 210;

a second muffler 300, a second muffler channel 301, a second clearance channel 302, and a second through hole 310;

Third muffler 400, third muffler channel 401, sound absorbing wedge 410, base 411, and wedge 412;

A porous sound absorbing layer 500;

Bellows 600;

the air inlet direction x.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, a detailed description of embodiments accompanied with figures is provided below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the application. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. The embodiments of the present application may be implemented in many other ways than those herein described, and those skilled in the art may make similar modifications without departing from the spirit of the application, so that the embodiments of the application are not limited to the specific embodiments disclosed below.

It will be appreciated that the terms "first," "second," and the like, as used herein, may be used to describe various terms, and are not to be interpreted as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. However, unless specifically stated otherwise, these terms are not limited by these terms. These terms are only used to distinguish one term from another. For example, the first, second, and third sound attenuating members are different sound attenuating members without departing from the scope of the application. In the description of the embodiments of the present application, the meaning of "a plurality", "a number" or "a plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally formed, as being mechanically connected, as being electrically connected, as being directly connected, as being indirectly connected through an intervening medium, as being in communication with or in interaction with two elements, unless explicitly stated otherwise. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature level is higher than the second feature level. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature level is less than the second feature level.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the related art, when the gas heater is used for supplying air, external air flow enters the gas mixing device through the air inlet pipe of the fan and is mixed with the gas with a proportion adjusted by the gas proportional valve in the premixing cavity at the air inlet of the fan. Then, the fan blows the air-fuel mixture into a burner for ignition combustion. In the process, high-speed airflow is generated in the air inlet channel, friction and resistance are generated between the airflow and the air inlet channel due to relative movement, so that the airflow is subjected to severe vibration, and noise is generated. The fan noise frequency of the gas water heater, which has a great influence on the living environment, is generally 650-2000 Hz, the noise with the frequency of 1000-2000 Hz is high-frequency noise, the noise with the frequency of 400-1000 Hz is medium-frequency noise, and the noise with the frequency of 20-400 Hz is low-frequency noise.

The inventor notices that the outside air is sucked into the premixing cavity through the high-speed fan with the speed of 7000-10000 r/min, the air and the air inlet channel can generate violent collision, if the frequency is overlapped with the natural frequency of the whole gas water heater, resonance phenomenon can be generated, and larger noise is further generated. In order to prevent resonance, the inventors have studied and found that the resonance frequency can be improved by providing an air layer, thereby achieving the purpose of noise reduction.

Based on the above consideration, in order to reduce the noise generated when the gas water heater is supplied with air, the inventor has designed a noise reduction structure through intensive studies, and by setting the noise reduction structure of different structures in a sectional manner and correspondingly setting an air layer at the same time, not only can the noise of different frequencies be reduced in a sectional manner, but also the frequency bandwidth of the noise which can be absorbed by the corresponding noise reduction channel can be widened, the resonance frequency can be improved, and the noise reduction can be further performed. The noise reduction device provided by the embodiment of the application is described in the following with reference to the related descriptions of some embodiments.

Fig. 1 shows a schematic diagram of an exploded structure of a noise reduction device in one embodiment of an embodiment of the present application, fig. 2 shows a schematic diagram of a cross-sectional structure of a noise reduction device in one embodiment of an embodiment of the present application, and only a portion related to an embodiment of the present application is shown for convenience of explanation.

Referring to fig. 1 and 2, an embodiment of the present application provides a noise reduction device for an air inlet of a gas water heater. The noise reduction device includes a housing 100, a first silencer 200, a second silencer 300, and a third silencer 400. The casing 100 has a containing chamber, one end of the casing 100 is provided with an air inlet 110, the other end of the casing 100 is provided with an air outlet 120, and the air inlet 110 and the air outlet 120 are respectively communicated with the containing chamber. The first silencer 200, the second silencer 300 and the third silencer 400 are sequentially arranged in the accommodating chamber along the air inlet direction x. The first silencing member 200 is internally provided with a first silencing channel 201 communicated with the air inlet 110, the second silencing member 300 is internally provided with a second silencing channel 301, the third silencing member 400 is internally provided with a third silencing channel 401 communicated with the air outlet 120, and the first silencing channel 201, the second silencing channel 301 and the third silencing channel 401 are sequentially communicated to form an air inlet channel. That is, the air flows sequentially through the air inlet 110, the first silencing channel 201, the second silencing channel 301, the third silencing channel 401 and the air outlet 120, and then enters the air inlet of the gas water heater.

Along the air inlet direction x, the cross-sectional area of the second silencing channel 301 is larger than that of the first silencing channel 201 and that of the third silencing channel 401, and step surfaces are respectively formed at the joint of the first silencing channel 201 and the second silencing channel 301 and the joint of the second silencing channel 301 and the third silencing channel 401. Since the cross-sectional area of the second silencing channel 301 is larger than that of the first silencing channel 201, a step surface is formed at the joint of the two, so that the cross-section between the two is not continuously or gradually changed, but is intermittent, and a structural form with suddenly changed cross-section is formed. That is, when the air flow enters the second silencing channel 301 from the first silencing channel 201, the cross-sectional area along the air inlet direction x is suddenly enlarged, the sound wave is reflected at the abrupt change of the cross-sectional area to attenuate the noise, so that an expanded silencing structure is formed, and the expansion type silencing structure has a better effect of attenuating the middle-low frequency noise. Since the cross-sectional area of the second silencing channel 301 is larger than that of the third silencing channel 401, a step surface is formed at the joint of the two channels, so that the cross-section between the two channels is not continuously or gradually changed, but is intermittent, and a structure form with suddenly changed cross-section is formed. That is, when the air flow enters the third silencing channel 401 from the second silencing channel 301, the cross-sectional area along the air inlet direction x is suddenly reduced, and the sound wave is reflected at the abrupt cross-sectional position to attenuate the noise, so that the attenuation effect of the second silencing channel 301 on the middle-low frequency noise is further enhanced.

The inventors have found that the air layer can affect the resonance frequency of the noise reduction structure, and can reduce the resonance frequency of the first sound deadening passage 201 to some extent. The first muffler 200 and the housing 100 define a first clearance passage 202 therebetween, and an air layer is formed by the first clearance passage 202. In order to further realize the air layer adjusting function, the first silencing member 200 is provided with a plurality of first through holes 210 for communicating the first silencing channels 201 and the first clearance channels 202. When the air flow passes through the first silencing channel 201, the frequency of external noise is the same as the natural frequency of the first silencing piece 200, so that air resonance in the first through hole 210 is caused, the air at the neck of the first through hole 210 generates intense vibration friction, the absorption effect of the first silencing channel 201 is enhanced, an absorption peak is formed, sound energy is greatly attenuated, and the sound energy is converted into heat energy to be dissipated after vibration friction. And a portion of the external noise having a frequency different from the natural frequency of the first muffler 200 may continue to be muffled through the first clearance passage 202. In this way, by providing the first clearance passage 202, the sound absorption frequency band of the noise of the first sound attenuation passage 201 is enlarged, so that the noise reduction process of the high-frequency band noise can be realized through the first sound attenuation passage 201.

Correspondingly, a second clearance channel 302 is defined between the second silencer 300 and the casing 100, and an air layer is formed through the second clearance channel 302. In order to further realize the air layer adjusting function, the second silencing member 300 is provided with a plurality of second through holes 310 for communicating the second silencing channels 301 and the second gap channels 302. When the air flow passes through the second silencing channel 301, most of the high-frequency noise is reduced in the first silencing channel 201, and the step surface noise formed at the joint of the first silencing channel 201 and the second silencing channel 301 is reduced to a certain extent, at this time, the second silencing channel 301 and the second gap channel 302 can further reduce the middle-low frequency noise. The step surface formed at the junction of the first and second sound-deadening passages 201 and 301 further dampens the noise when the air flow passes through the third sound-deadening passage 401, and the third sound-deadening passage 401 can attenuate the low frequency noise.

Therefore, by combining the structure of each silencing channel, the first gap channel 202 and the second gap channel 302, the first silencing channel 201 can reduce the noise in the high frequency band, the second silencing channel 301 can reduce the noise in the middle and low frequency bands, and the third silencing channel 401 can further reduce the noise in the low frequency band, and the noise of the air flow generated during the air inlet of the gas water heater is silenced layer by layer and attenuated gradually, so that the noise is reduced, and the comfort level of a user is improved.

To further enhance the attenuation of sound waves away from the resonant frequency in the first sound attenuation channel 201, in some embodiments, referring to fig. 2, the noise attenuation device further includes a porous sound absorption layer 500 disposed between the first sound attenuation member 200 and the housing 100. At this time, the first clearance channel 202 is defined between the porous sound absorbing layer 500 and the first sound attenuating member 200. That is, the porous sound absorbing layer 500 may be disposed adjacent to the inner wall of the case 100 as illustrated in fig. 2, and forms the first gap passage 202 with the outer wall of the first sound attenuating member 200. In this way, the porous sound absorbing layer 500, which forms a resonance sound absorbing structure together with the first sound absorbing channel 201, the first through hole 210 and the first gap channel 202, increases acoustic resistance, so that the first sound absorbing channel 201 can structurally absorb wider noise frequency band, and enhances the noise reduction effect.

The porous sound absorbing layer 500 may be made of porous sound absorbing materials such as organic fiber materials, hemp cotton felt, inorganic fiber materials, glass cotton, rock cotton, mineral cotton, urea formaldehyde foam, urethane foam, etc., and may be selected according to practical situations, which is not particularly limited in the embodiment of the present application.

Fig. 3 shows a schematic structural view of the sound absorbing wedge 410 in one implementation of the embodiment of the present application, and only the portions relevant to the embodiment of the present application are shown for convenience of explanation.

To further enhance the silencing effect of the third silencing channel 401, in some embodiments, referring to fig. 3 in combination with fig. 1 and 2, the noise reduction device further includes a plurality of sound absorbing wedges 410 disposed in the third silencing channel 401. The sound absorbing wedge 410 has a base 411 and a wedge portion 412 opposite the base 411, the base 411 being provided at a side wall of the third sound deadening passageway 401, the wedge portion 412 extending away from the side wall. In this way, by arranging the sound absorption wedge 410, the acoustic impedance between the air and the sound absorption material is gradually transited, and good impedance matching and sound absorption effects are obtained. In particular, in some embodiments, along the extension of the split 412, the length of the split 412 is L1 and the length of the base 411 is L2. The ratio of L1 to L2 is 4. In this way, the sound absorbing performance can be improved while ensuring the skeleton rigidity of the sound absorbing wedge 410. In yet other embodiments, referring to fig. 1, a plurality of sound absorbing wedges 410 are arranged around the side wall of the third sound attenuation channel 401. In this way, the effect of absorbing low-frequency noise in the third sound deadening passage 401 is further improved. While in still other embodiments, the third muffler 400 is constructed of a porous sound absorbing material. In this process, since the third muffler 400 is integrally formed of the porous sound absorbing material, the thickness of the porous sound absorbing material is thicker than that of the porous sound absorbing layer 500, and the flow resistance is larger, that is, the resistance of air particles passing through is larger, so that the sound absorbing coefficient of low-frequency noise can be improved, and the noise absorbing effect is further improved.

In some embodiments, referring still to fig. 3, the sound absorbing wedge 410 comprises a flat wedge. That is, a cut surface is provided on the side of the split 412 away from the base 411, forming the split 412 with a flat head. In this way, the space in the third sound deadening passage 401 can be saved while achieving a better absorption effect.

In order to better combine the characteristics of the whole gas water heater, the inventor finds that if the resonance frequency of the first silencing channel 201 is kept within the range of 1800 Hz-2200 Hz, and the resonance frequency of the second silencing channel 301 is kept within the range of 500 Hz-700 Hz, the silencing process can be better performed, and most of noise is reduced. Thus, in some embodiments, the aperture of the first through hole 210 is d1, the thickness of the first silencing member 200 is t1, the thickness of the first clearance channel 202 is h1, and the area ratio of the sum of the areas of the plurality of first through holes 210 to the area of the first silencing member 200 is P1, satisfying the following conditions that 3 mm≤d1≤3.5 mm, 1 mm≤t1≤1.5 mm, 5 mm≤h1≤10mm, and 0.04≤P1≤0.05. In this way, the first sound deadening passageway 201 can be made wider in the noise band that can be absorbed structurally. In other embodiments, the aperture of the second through hole 310 is d2, the thickness of the second silencing member 300 is t2, the thickness of the second gap channel 302 is h2, and the ratio of the sum of the areas of the plurality of second through holes 310 to the area of the second silencing member 300 is P2, wherein d2 is 2.5mm < 3mm, t2 is 2mm < 3mm, h2 is 30mm < 35mm, and P2 is 0.025 mm < 0.03. In this way, the second silencing channel 301 can be made to absorb mid-frequency noise better in structure. For example, the aperture d1 of the first through holes 210 may be made 3mm, the thickness t1 of the first sound attenuating member 200 is 0.6mm, the interval between the first through holes 210 is 6mm, and the ratio P1 of the sum of the areas of the plurality of first through holes 210 to the area of the first sound attenuating member 200 is 0.042, so that the resonance frequency of the first sound attenuating passage 201 is made to be close to 2000Hz.

Fig. 4 shows a schematic view of the arrangement of the first through holes 210 in one embodiment of the present application, fig. 5 shows a schematic view of the arrangement of the first through holes 210 in another embodiment of the present application, fig. 6 shows a schematic view of the arrangement of the first through holes 210 in yet another embodiment of the present application, and only a portion related to the embodiment of the present application is shown for convenience of explanation.

Since the noise with different frequencies has different resonance frequencies, the arrangement of the first through holes 210 and the second through holes 310 may also be different, and the arrangement may be selected according to the resonance frequencies in practical use. In some embodiments, the plurality of first through holes 210 are arranged to be repeatedly formed in a first unit pattern including one of a triangle and a rectangle. In other embodiments, the extending directions of the plurality of first through holes 210 are parallel to each other. In some embodiments, the plurality of second through holes 310 are arranged in a second unit pattern repeatedly formed, the second unit pattern including one of a triangle and a rectangle. In other embodiments, the extending directions of the plurality of second through holes 310 are parallel to each other. In this way, the desired resonance frequency can be achieved to better absorb noise. For example, fig. 4 illustrates a case where the first unit pattern is a triangle, fig. 5 illustrates a case where the first unit pattern is a square, and fig. 6 illustrates a case where the first through holes 210 are bar-shaped holes and the plurality of first through holes 210 are parallel to each other. The arrangement of the second through holes 310 may refer to the schematic arrangement of the first through holes 210, and will not be described herein.

The first unit pattern refers to a pattern formed by connecting lines between centers of adjacent first through holes 210. For example, when the first unit pattern is a triangle, the first unit pattern refers to a triangle formed by connecting lines of centers of adjacent three first through holes 210. For another example, when the first unit pattern is a square, the first unit pattern refers to a square formed by connecting lines of centers of four adjacent first through holes 210. The second unit pattern may be described with reference to the first unit pattern, and will not be described herein.

In some embodiments, referring to fig. 1 and 2, the noise reduction device further includes a diversion channel 203 connected between the air inlet 110 and the first silencing channel 201. The cross-sectional area of the diversion channel 203 decreases in the air intake direction x. In this way, air is conveniently guided into the first silencing channel 201. It should be noted that the cross-sectional area of the diversion channel 203 may be continuously reduced or discontinuously reduced. For example, fig. 1 and 2 illustrate a situation in which the cross-sectional area of the diversion channel 203 gradually decreases.

In some embodiments, referring to fig. 1 and 2, the first silencing member 200 is formed as a unitary structure or a split structure with the housing 100. In this way, manufacturing or installation is facilitated as desired. For example, fig. 1 and 2 illustrate a case where the first muffler 200 is of a unitary structure with the housing 100.

In some embodiments, referring to fig. 1 and 2, the noise reducer further includes a bellows 600. The air outlet 120 communicates with the air inlet of the gas water heater by means of a bellows 600. Thus, the generation of a fluid boundary layer can be destroyed, and the air inlet resistance is reduced. Optionally, a pressure measuring nozzle (not shown) may be further disposed on the bellows 600, and a venturi flowmeter (not shown) may be further added as required, so that the intake air flow rate can be measured more accurately.

Based on the same inventive concept, the application provides a gas water heater, which comprises a noise reduction device in the embodiment, wherein the noise reduction device is arranged at an air inlet of the gas water heater. Therefore, the noise generated when the gas water heater is used for air intake can be reduced, and the use experience of a user is improved.

In summary, in the noise reduction device according to the embodiment of the present application, the noise reduction channels are arranged in a segmented manner, and the first gap channel 202, the second gap channel 302, the porous sound absorption layer 500 and the sound absorption wedge 410 are combined, so that the airflow noise sequentially passes through the first noise reduction channel 201, the second noise reduction channel 301 and the third noise reduction channel 401, and then is gradually attenuated layer by layer, thereby reducing the airflow noise and improving the comfort level of users.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A noise reduction device for an air inlet of a gas water heater, comprising:

The shell (100) is provided with a containing cavity, one end of the shell (100) is provided with an air inlet (110), the other end of the shell (100) is provided with an air outlet (120), the air inlet (110) and the air outlet (120) are respectively communicated with the containing cavity, and

The air inlet device comprises a first silencing piece (200), a second silencing piece (300) and a third silencing piece (400) which are sequentially arranged in a containing cavity along an air inlet direction (x), wherein a first silencing channel (201) communicated with an air inlet (110) is formed in the first silencing piece (200), a second silencing channel (301) is formed in the second silencing piece (300), a third silencing channel (401) communicated with an air outlet (120) is formed in the third silencing piece (400), and the first silencing channel (201), the second silencing channel (301) and the third silencing channel (401) are sequentially communicated to form an air inlet channel;

The cross-sectional area of the second silencing channel (301) is larger than that of the first silencing channel (201) and that of the third silencing channel (401) along the air inlet direction (x), and step surfaces are respectively formed at the joint of the first silencing channel (201) and the second silencing channel (301) and the joint of the second silencing channel (301) and the third silencing channel (401);

A first clearance channel (202) is defined between the first silencing piece (200) and the shell (100), and a second clearance channel (302) is defined between the second silencing piece (300) and the shell (100);

The first silencing piece (200) is provided with a plurality of first through holes (210) which are communicated with the first silencing channel (201) and the first clearance channel (202), and the second silencing piece (300) is provided with a plurality of second through holes (310) which are communicated with the second silencing channel (301) and the second clearance channel (302).

2. The noise reduction device according to claim 1, further comprising a porous sound absorbing layer (500) provided between the first sound attenuating member (200) and the housing (100);

The porous sound absorbing layer (500) and the first sound attenuating member (200) define the first clearance passage (202) therebetween.

3. The noise reducer of claim 1, further comprising a plurality of sound absorbing wedges (410) disposed within the third sound attenuating passage (401);

The sound absorption wedge (410) is provided with a base (411) and a tip (412) opposite to the base (411), the base (411) is arranged on the side wall of the third sound absorption channel (401), and the tip (412) extends away from the side wall.

4. A noise reducing device according to claim 3, characterized in that the length of the tip (412) is L1 and the length of the base (411) is L2 in the extension direction of the tip (412);

wherein the ratio of L1 to L2 is 4.

5. A noise reducing device according to claim 3, wherein a plurality of said sound absorbing wedges (410) are arranged around a side wall of said third sound absorbing channel (401), and/or

The sound absorbing wedge (410) comprises a flat wedge.

6. Noise reduction device according to any of claims 1-5, characterized in that the third sound attenuation member (400) is composed of a porous sound absorbing material, and/or

The extending directions of the plurality of the first through holes (210) are parallel to each other, and/or

The extending directions of the plurality of second through holes (310) are parallel to each other.

7. The noise reduction device according to any one of claims 1 to 5, characterized in that the aperture of the first through hole (210) is d1, the thickness of the first noise reduction member (200) is t1, the thickness of the first clearance channel (202) is h1, and the area ratio of the sum of the areas of the plurality of first through holes (210) to the first noise reduction member (200) is P1, satisfying the following condition:

3mm≤d1≤3.5mm;

1mm≤t1≤1.5mm;

5mm≤h1≤10mm;

0.04≤P1≤0.05;

And/or the aperture of the second through hole (310) is d2, the thickness of the second silencing piece (300) is t2, the thickness of the second clearance channel (302) is h2, the area ratio of the sum of the areas of the plurality of second through holes (310) to the second silencing piece (300) is P2, and the following conditions are satisfied:

2.5mm≤d2≤3mm;

2mm≤t2≤3mm;

30mm≤h2≤35mm;

0.025≤P2≤0.03。

8. The noise reduction device according to any one of claims 1 to 5, wherein a plurality of the first through holes (210) are arranged in a first unit pattern repeatedly formed, the first unit pattern including one of a triangle, a rectangle, and/or

The plurality of second through holes (310) are arranged in a repeating pattern of second unit patterns, the second unit patterns including one of triangles and rectangles.

9. Noise reduction device according to any of claims 1-5, characterized in that the noise reduction device further comprises a bellows (600), the air outlet (120) being in communication with the air inlet of the gas water heater by means of the bellows (600), and/or

The noise reduction device further comprises a flow guide channel (203) connected between the air inlet (110) and the first silencing channel (201), and the cross-sectional area of the flow guide channel (203) is reduced along the air inlet direction (x).

10. A gas water heater comprising a noise reduction device according to any one of claims 1 to 9, said noise reduction device being provided at the inlet of said gas water heater.