WO2017193479A1 - Gas water heater - Google Patents

Abstract

A gas water heater (100) comprises: a housing (10), in which an accommodation cavity (13) is defined; a pre-mixing chamber casing (20), wherein the pre-mixing chamber casing (20) is disposed in the accommodation cavity (13), and a mixing chamber is defined in the pre-mixing chamber casing (20); a burner (30), disposed below the mixing chamber; a heat exchanger (40), disposed below the burner (30) and connected to the burner (30) to absorb heat generated by the burner (30); a pre-heating plate (50), connected to the burner (30) to pre-heat the burner (30); and a controller, connected to the pre-heating plate (50) to control heating temperature of the pre-heating plate (50).

Description

Gas water heater Technical field

The invention relates to the technical field of water heaters, and more particularly to a gas water heater.

Background technique

The main combustion method of the burner of the gas water heater in the related art is flaming combustion, which not only reduces the energy utilization rate, but also emits a large amount of pollutants during the combustion process, which is one of the main causes of frequent smog weather. . Therefore, replacing the traditional inefficient combustion method with an efficient and clean combustion method is considered to be the most ideal combustion method.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, the present invention provides a gas water heater, which has a simple structure, reliable connection of various components, convenient assembly and disassembly, and fuel can be subjected to flameless catalytic combustion in the burner, which can avoid generation of harmful gases, and is safe and environmentally friendly.

A gas water heater according to an embodiment of the present invention includes: a casing defining a receiving chamber therein, the casing having an exhaust port, a hot water outlet, and a cold water inlet; a premixing cavity shell, the premixing chamber a body casing is disposed in the accommodating cavity, a pre-mixing cavity body defines a mixing cavity therein; a burner, the burner is disposed under the mixing cavity, and the burner is electrically connected to the mixing cavity a catalyst for catalyzing the smokeless catalytic combustion of the burner; a heat exchanger disposed below the burner and connected to the burner to absorb the combustion The heat generated by the combustion, the heat exchanger having a water inlet and a water outlet, the water inlet is electrically connected to the cold water inlet, the water outlet is electrically connected to the hot water outlet; the preheating tray, the preheating A heating plate is coupled to the burner to preheat the burner; a controller coupled to the preheating plate to control a heating temperature of the preheating plate.

According to the gas water heater of the embodiment of the present invention, the preheating tray can pre-catalyze the catalyst in the burner by providing a catalyst for generating flameless catalytic combustion of the fuel in the burner and providing a preheating tray outside the burner. Heat, which lowers the light-off temperature of the fuel, allows the fuel to fully burn and deepen its oxidation level, which not only improves the fuel reaction rate, improves the fuel utilization rate, but also avoids the generation of harmful gases (carbon monoxide and nitrogen oxides). Control the production of carbon monoxide and nitrogen oxides from the source. The gas water heater has a simple structure, reliable connection of various components, convenient assembly and disassembly, and fuel can be flameless catalytic combustion in the burner, which greatly reduces the generation of harmful gases, and is safe and environmentally friendly.

In addition, the gas water heater according to the embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the present invention, a fan and a gas proportional valve are further included, the fan and the gas proportional valve are respectively connected to the controller, and the fan is disposed above the mixing chamber to the mixing chamber Conveying air A gas proportional valve is coupled to the burner to deliver the gas to the mixing chamber.

According to an embodiment of the invention, the preheating temperature of the preheating tray to the burner is controlled between 300 ° C and 400 ° C.

According to an embodiment of the invention, the preheating disk is heated by electrical heating.

According to an embodiment of the invention, the catalyst is a piece of precious metal material or a piece of non-metallic material.

According to an embodiment of the invention, the catalyst is coated on the inner wall surface of the burner.

According to an embodiment of the invention, a catalyst carrier is provided in the burner, and the catalyst is coated on the surface of the catalyst carrier.

According to an embodiment of the invention, the catalyst support is a honeycomb ceramic.

According to an embodiment of the invention, a temperature detector is provided in the burner to detect the heating temperature of the catalyst.

According to an embodiment of the present invention, the heating temperature of the catalyst is T, and if T>400 ° C, the controller controls the fan and the gas proportional valve to be respectively activated to deliver the air to the mixing chamber and The gas; if T>700 ° C, the controller controls the preheating tray to stop heating.

According to an embodiment of the invention, a spoiler or a damper is provided in the mixing chamber to sufficiently mix the air with the gas.

According to an embodiment of the present invention, a hood is further provided, the hood is connected to the heat exchanger and is electrically connected to the exhaust port, and the hood is used for collecting and discharging and burning The smoke produced by the combustion of the device.

According to an embodiment of the present invention, further comprising a buffer water tank disposed in the accommodating chamber, the buffer water tank being located between the water outlet and the hot water outlet in a water flow direction and And communicating with the water outlet and the hot water outlet respectively.

According to an embodiment of the invention, the heat exchanger comprises a first heat exchanger and a second heat exchanger, the first heat exchanger being disposed above the second heat exchanger and located at the burner Between the second heat exchanger and the second heat exchanger.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a schematic structural view of a gas water heater according to an embodiment of the present invention.

Reference mark:

100: gas water heater;

10: housing; 11: air inlet; 12: exhaust port; 13: receiving chamber;

20: pre-mixing the cavity shell;

30: burner; 31: temperature detector;

40: heat exchanger; 40a: first heat exchanger; 40b: second heat exchanger; 41: buffer water tank;

50: preheating plate;

70: fan;

80: gas proportional valve;

90: collecting hood; 91: condensing water box.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

The main combustion mode of the burner of a gas water heater is flaming combustion: gas and air are not pre-mixed in the combustion device, but they are respectively sent into the combustion chamber and burned while mixing in the combustion chamber. The way the combustion produces a longer flame with a sharp outline that belongs to diffusion combustion. Flaming combustion results in higher activation energy, slower burning, and incomplete combustion, which leads to a decrease in thermal efficiency. In addition, the amount of gas radiation from a flame combustion flame is small, and convective heat transfer is the main heat transfer mode, which reduces energy utilization. Furthermore, due to the difference in contact between the different parts of the combustion and the air, the degree of completeness of combustion and the temperature are also different. Specifically, in the high temperature region, due to the high temperature, oxygen and nitrogen in the air react to form nitrogen oxide contaminants; in the low temperature region, harmful substances such as carbon monoxide, hydrocarbons, and tar are generated due to incomplete combustion.

To this end, the present invention provides a gas water heater 100. The gas water heater 100 has a simple structure, reliable connection of components, convenient assembly and disassembly, and fuel can be flameless catalytic combustion in the burner 30 to avoid generation of harmful gases and safe use. And environmental protection.

A gas water heater 100 according to an embodiment of the present invention will be specifically described below with reference to FIG.

A gas water heater 100 according to an embodiment of the present invention includes a housing 10, a premixing chamber housing 20, a combustor 30, a heat exchanger 40, a preheating tray 50, and a controller (not shown). Specifically, the housing 10 defines a receiving chamber 13 having an exhaust port 12, a hot water outlet (not shown), and a cold water inlet (not shown), and the premixing chamber housing 20 is disposed in the receiving chamber. In the pre-mixing cavity shell 20, a mixing chamber is defined, the burner 30 is disposed below the mixing chamber, the burner 30 is electrically connected to the mixing chamber, and the catalytic burner 30 is provided in the burner 30 for the smokeless catalytic combustion. The catalyst, the heat exchanger 40 is disposed below the burner 30 and connected to the burner 30 to absorb the heat generated by the combustion of the burner 30. The heat exchanger 40 has a water inlet and a water outlet, and the water inlet is connected to the cold water inlet, and the water outlet is connected. In conjunction with the hot water outlet, the preheating tray 50 is coupled to the burner 30 to preheat the burner 30, and the controller is coupled to the preheating tray 50 to control the heating temperature of the preheating tray 50.

In other words, the gas water heater 100 is mainly composed of a housing 10, a premixing chamber housing 20, a burner 30, a heat exchanger 40, a preheating tray 50, and a controller. Wherein, the housing 10 extends in a vertical direction (up and down direction as shown in FIG. 1), and a housing cavity is defined in the housing 10. The housing 10 has a fuel inlet 11 and an exhaust port 12 for exhaust gas, and is premixed. A cavity for housing air and gas is defined in the cavity housing 20. The premixing cavity housing 20 has a gas inlet, an air inlet and a mixed gas outlet that are electrically connected to the mixing chamber, and the burner 30 is connected to the premixing chamber housing 20. The fuel in the mixing chamber can enter the combustor 30 for combustion.

Specifically, the burner 30 is provided with a catalyst which can lower the light-off temperature of the fuel and deepen the oxidation degree thereof, so that the organic matter is flamelessly burned at the light-off temperature of the bottom, and the fuel is oxidized and decomposed into the final combustion. The product carbon dioxide and water, at the same time, release a large amount of heat, the reactant molecules of the fuel can be concentrated on the surface of the catalyst, increase the reaction rate, improve the utilization of fuel, the catalyst can effectively inhibit the production of nitrogen oxides, colleagues catalyze The combustion is relatively complete, reducing the content of carbon monoxide in the flue gas, thereby effectively reducing the emission of harmful gases. The preheating tray 50 is connected to the burner 30 to preheat the burner 30 to a certain temperature. The preheating tray 50 can preheat the catalyst in the burner 30 to a certain temperature, so that the mixed gas of air and gas enters. Flameless combustion can occur within the combustor 30, reducing the harmful gases generated by the fuel at the time of ignition.

The heat exchanger 40 is coupled to the combustor 30. When the combustor 30 is in operation, water in the heat exchanger 40 can absorb the heat generated by the combustor 30, thereby forming hot water for use by the user. For example, a large amount of heat generated by the burner 30 can be directly exchanged with the surface of the heat exchanger 40 to achieve the purpose of heating the water in the heat exchanger 40. Specifically, the heat exchanger 40 is provided with fins and a high temperature. The flue gas impinges on the fins on the heat exchanger 40 for heat exchange. Of course, the present invention is not limited thereto, and a plurality of water pipes for circulating water may be disposed in the heat exchanger 40. The outside of the heat exchanger 40 is provided with an inlet pipe and an outlet pipe communicating with the water pipe, and the system may pass through the water inlet pipe ( Not shown) injecting cold water into the water pipe of the heat exchanger 40, the combustion of the fuel in the burner 30 generates high-temperature flue gas, and the high-temperature flue gas enters the water heater and exchanges heat with the water in the water pipe to reach the heat exchanger. For the purpose of water heating in 40, the hot water in the heat exchanger 40 is finally discharged from the outlet pipe (not shown) out of the gas water heater 100 for use by the user.

Specifically, as shown in FIG. 1 , in the present embodiment, the pre-mixing cavity shell 20 , the burner 30 , the heat exchanger 40 , the preheating tray 50 , the fan 70 , and the gas proportional valve 80 are all disposed on the casing 10 . The accommodating chamber 13 is provided with a fan 70 and a heat exchanger 40 respectively above and below the burner 30. A premixing chamber shell 20, a preheating tray 50 and a burner 30 are disposed between the fan 70 and the burner 30. Connected to preheat the catalyst in the burner 30. When the gas water heater 100 is in operation, the air and the gas respectively enter the mixing chamber and mix uniformly, and then the fuel flows from top to bottom into the burner 30 located below the mixing chamber for combustion. The high-temperature flue gas generated by the burner 30 enters the heat exchanger 40 from the top to the bottom to exchange heat with the cold water in the water pipe, thereby achieving the purpose of heating the water. In the process, the fan 70 can be operated as the preheating plate 50. Directional support is provided for preheating the burner 30.

Thus, the gas water heater 100 according to an embodiment of the present invention is provided for generating fuel by being disposed in the burner 30. A catalyst for flameless catalytic combustion, and a preheating plate 50 is disposed outside the burner 30, so that the preheating plate 50 can preheat the catalyst in the burner 30, thereby reducing the light-off temperature of the fuel, so that the fuel can be fully burned. And to deepen its oxidation degree, it can not only improve the fuel reaction rate, improve the fuel utilization rate, but also avoid the generation of harmful gases (carbon monoxide and nitrogen oxides), and control the production of carbon monoxide and nitrogen oxides from the source. The gas water heater 100 has a simple structure, reliable connection of various components, convenient assembly and disassembly, and fuel can be flameless catalytic combustion in the burner 30, which greatly reduces the generation of harmful gases, and is safe and environmentally friendly.

When the gas water heater 100 is in operation, the fan 70 and the gas proportional valve 80 respectively deliver air and gas into the mixing chamber, and the air and the gas are thoroughly mixed in the mixing chamber, and then enter the burner 30 located below the mixing chamber for combustion. Since the preheating plate 50 has preheated the catalyst in the burner 30, the flame can be subjected to flameless catalytic combustion as soon as the fuel enters the burner 30. In the catalytic combustion process, the catalyst acts to lower the light-off temperature of the fuel. And deepen the degree of oxidation, so that the organic matter undergoes flameless combustion at a lower light-off temperature, and oxidatively decomposes to burn the final product carbon dioxide and water, releasing a large amount of heat while enriching the reactant molecules on the catalyst surface. In order to increase the reaction rate, improve fuel utilization, and greatly reduce harmful gases generated by fuel combustion.

Compared with the gas water heater using flaming combustion in the related art, the gas water heater 100 has a simple structure, reliable connection of various components, reasonable layout, convenient assembly and disassembly, and a catalyst can be disposed in the burner 30, and the burner 30 can be disposed. The preheating preheating plate 50 can reduce the catalytic combustion temperature of the fuel, effectively suppress the generation of nitrogen oxides, and at the same time, the catalytic combustion of the fuel is relatively complete, and the content of carbon monoxide in the flue gas can be reduced, thereby effectively reducing the emission of harmful gases. The gas water heater 100 can completely burn the fuel, improve the combustion efficiency of the fuel, thereby improving the heating efficiency of the gas water heater 100, and reducing the emission of harmful gases (such as carbon monoxide and nitrogen oxides), and is safe and environmentally friendly.

According to an embodiment of the present invention, the gas water heater 100 further includes a fan 70 and a gas proportional valve 80. The fan 70 and the gas proportional valve 80 are respectively connected to the controller, and the fan 70 is disposed above the mixing chamber to deliver air to the mixing chamber. In order to provide power for the flow of air, the gas proportional valve 80 is connected to the burner 30 to deliver the gas to the mixing chamber to ensure the fuel supply of the gas water heater 100, thereby ensuring the normal operation of the gas water heater 100.

The preheating temperature of the preheating plate 50 to the burner 30 is controlled at 300 ° C to 400 ° C. That is, before passing the fuel into the combustor 30, the controller controls the preheating tray 50 to preheat the combustor 30, preheating the catalyst in the combustor 30 to 300 ° C - 400 ° C, and finally lowering into the combustor. The light-off temperature of the gas within 30 allows the fuel to undergo flameless combustion and reduces the generation of harmful gases.

Preferably, in accordance with an embodiment of the present invention, the preheating tray 50 is heated by electrical heating. For example, the preheating tray 50 may be electromagnetically heated, or may be electrically heated by electric resistance, etc., by connecting the preheating tray 50 to the burner 30, the burner 30 may be preheated, that is, the catalyst in the burner 30 may be pre-prepared. Heat, thereby reducing the light-off temperature of the fuel, thereby deepening the oxidation of the fuel, causing the flame to burn at a lower light-off temperature, Reduce the generation of harmful gases and be more environmentally friendly.

Optionally, in accordance with an embodiment of the invention, the catalyst is a piece of precious metal material or a piece of non-metallic material. In some embodiments of the invention, the catalyst is coated on the inner wall surface of the combustor 30. Specifically, the inner surface of the burner 30 is coated with a precious metal layer, and the gas enters the burner 30. The noble metal on the inner surface of the burner 30 can catalyze the gas, and under the action of the noble metal, the light-off temperature of the fuel can be lowered to At 350 ° C, the burner temperature of the burner 30 is effectively reduced, and the generation of nitrogen oxides is suppressed, and the catalyst can oxidize carbon monoxide to carbon dioxide, thereby achieving the purpose of reducing harmful gas emissions.

In other embodiments of the invention, a catalyst carrier is disposed within the combustor 30 and the catalyst is coated on the surface of the catalyst support. Preferably, the catalyst support is a honeycomb ceramic. High temperature resistance of 1200 ° C, to ensure the reliability of the catalyst in the burner 30, thereby extending the service life. When a mixed gas of air and gas enters the combustor 30, the catalyst on the catalyst carrier can catalyze the fuel to cause flameless catalytic combustion of the fuel, and the fuel in the combustor 30 is compared with direct combustion in the related art. The lower light-off temperature can effectively inhibit the production of nitrogen oxides, and at the same time, the catalytic combustion of the fuel is relatively complete, and the content of carbon monoxide in the flue gas is reduced.

In some embodiments of the invention, a temperature detector 31 is provided within the combustor 30 to detect the heating temperature of the catalyst. Specifically, the heating temperature of the catalyst is T. If T>400° C., the controller controls the fan 70 and the gas proportional valve 80 to be respectively activated to deliver air and gas to the mixing chamber; if T>700° C., the controller controls the preheating plate 50. Stop heating.

Specifically, the controller outputs a signal to the fan 70 and the gas proportional valve 80. The fan 70 operates after receiving the signal to provide air and power; the gas proportional valve 80 is opened after receiving the signal, and the ejector area is set in the gas passage (usually Wenqiu) In the mode), when the fan 70 is operated, the gas is exhausted to provide gas for combustion, the gas and the air enter the mixing chamber for thorough mixing, and then the preheating plate 50 preheats the catalyst in the burner 30 and the burner 30, Since the preheating tray 50 has previously preheated the catalyst, when the gas/air mixture enters the combustor 30, the fuel achieves flameless catalytic combustion under the action of the catalyst, and combustion to generate high temperature flue gas can be performed with the heat exchanger 40. The heat exchange transfers heat to the water flowing in the heat exchanger 40, so that the water heater generates hot water, and after the high temperature flue gas and the heat exchanger 40 are exchanged for heat, the temperature is lowered, and finally the gas water heater 100 is excluded.

It should be noted here that since the fuel undergoes flameless catalytic combustion in the burner 30, the catalytic combustion is a self-sustaining reaction, and the catalytic combustion can be continued as long as the temperature reaches 700 ° C or higher and there is a gas/air supply.

Thereby, the fuel in the gas water heater 100 is subjected to flameless catalytic combustion, the combustion is moderated, the combustion noise can be greatly reduced, and the combustion process is safer. Further, the catalyst in the burner 30 can reduce the need for maintaining the combustion reaction. The reaction temperature saves the combustion reaction itself from the consumption of fuel combustion energy, achieves low emission of carbon monoxide and nitrogen oxides, and is energy-saving and environmentally friendly.

Advantageously, in accordance with an embodiment of the present invention, a spoiler or damper (not shown) is provided within the mixing chamber to adequately mix the air with the gas. Specifically, before the burner 30 of the gas water heater 100 is in operation, the system needs to The gas is fully premixed in the mixing chamber. When the fan 70 and the gas proportional valve 80 respectively input air and gas into the mixing chamber, the spoiler and the damper in the mixing chamber can disrupt the flow of air and gas, thereby making the air Fully and evenly mixed with the gas to ensure flameless catalytic combustion of the fuel.

In addition, according to an embodiment of the present invention, the gas water heater 100 further includes a hood 90, the hood 90 is connected to the heat exchanger 40 and is connected to the exhaust port 12, and the hood 90 is used for collecting, discharging and burning. The burner 30 burns the generated flue gas and finally discharges the flue gas to the outside. Referring to FIG. 1, in the present embodiment, the hood 90 is disposed under the heat exchanger 40, the heat exchanger 40 has a smoke inlet and a smoke outlet, and the inlet of the heat exchanger 40 is connected to the burner 30. The outlet of the heat exchanger 40 is connected to the hood 90, and the high-temperature flue gas generated by the flameless catalytic combustion of the fuel in the burner 30 enters the heat exchanger 40 through the inlet, and the high-temperature flue gas and the heat exchanger 40 The flowing water inside is discharged to the hood 90 from the vent port after the heat exchange, and finally discharged to the outside through the exhaust pipe on the hood 90.

The gas water heater 100 further includes a buffer water tank 41. The buffer water tank 41 is disposed in the accommodating chamber 13, and the buffer water tank 41 is located between the water outlet and the hot water outlet in the water flow direction and is respectively connected with the water outlet and the hot water outlet. . Referring to Fig. 1, a buffer water tank 41 is disposed in the accommodating chamber 13 of the casing 10 and above the heat exchanger 40. The cold water in the heat exchanger 40 is subjected to heat exchange and enters the buffer water tank 41 for pressure release. During the heat exchange process, the hot water in the buffer water tank 41 is gradually increased. If the user needs hot water, the valve can be opened and the hot water can be taken, thereby providing the user with a sufficient amount of domestic water. The casing 10 is further provided with a switch solenoid valve/electric three-way valve and a condensate water tank 91. The switch solenoid valve/electric three-way valve can realize the switching of the waterway, and the condensate water tank 91 can collect the condensed water generated by the heat exchange of the system, and finally Exclude the gas water heater 100.

In some embodiments of the invention, the heat exchanger 40 includes a first heat exchanger 40a and a second heat exchanger 40b, the first heat exchanger 40a being disposed above the second heat exchanger 40b and located at the combustor 30 Between the second heat exchanger 40b. The high-temperature flue gas generated after the flame-free catalytic combustion of the fuel in the combustor 30 can enter the first heat exchanger 40 and the second heat exchanger 40, respectively, and then with the first heat exchanger 40a and the second heat exchanger, respectively. The cold water in the water pipe in 40b performs heat exchange, so that the first heat exchanger 40a and the second heat exchanger 40b respectively generate hot water for the user to use, and by providing two heat exchangers 40 in the casing 10, the heat can be improved. The heating efficiency of the gas water heater 100 ensures that the user can have water demand in real time, and the user experience is better.

Other configurations and operations of gas water heater 100 in accordance with embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. Must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a The limits of the Ming.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (14)

A gas water heater characterized by comprising: a housing defining a receiving chamber therein, the housing having an exhaust port, a hot water outlet, and a cold water inlet; Pre-mixing a cavity shell, the pre-mixing cavity shell is disposed in the receiving cavity, and a pre-mixing cavity body defines a mixing cavity therein; a burner, the burner is disposed below the mixing chamber, the burner is electrically connected to the mixing chamber, and a catalyst for catalyzing the smokeless catalytic combustion of the burner is disposed in the burner; a heat exchanger, the heat exchanger being disposed below the burner and connected to the burner to absorb heat generated by combustion of the burner, the heat exchanger having a water inlet and a water outlet, the inlet The water inlet is electrically connected to the cold water inlet, and the water outlet is electrically connected to the hot water outlet; Preheating a tray, the preheating tray being coupled to the burner to preheat the burner; And a controller coupled to the preheating tray to control a heating temperature of the preheating tray. The gas water heater according to claim 1, further comprising a fan and a gas proportional valve, wherein the fan and the gas proportional valve are respectively connected to the controller, and the fan is disposed above the mixing chamber To deliver air to the mixing chamber, the gas proportional valve is coupled to the burner to deliver the gas to the mixing chamber. The gas water heater according to claim 1 or 2, characterized in that the preheating temperature of the preheating tray to the burner is controlled at 300 °C - 400 °C. The gas water heater according to any one of claims 1 to 3, wherein the preheating tray is heated by electric heating. The gas water heater according to any one of claims 1 to 4, wherein the catalyst is a precious metal material member or a non-metal material member. A gas water heater according to claim 5, wherein said catalyst is coated on an inner wall surface of said burner. A gas water heater according to claim 5, wherein a catalyst carrier is disposed in said burner, said catalyst being coated on a surface of said catalyst carrier. The gas water heater according to claim 7, wherein said catalyst carrier is a honeycomb ceramic. The gas water heater according to claim 2, wherein a temperature detector is provided in said burner to detect a heating temperature of said catalyst. The gas water heater according to claim 9, wherein the heating temperature of the catalyst is T, and if T > 400 ° C, the controller controls the fan and the gas proportional valve to be respectively activated to the mixing The chamber delivers the air and the gas; if T > 700 ° C, the controller controls the preheating tray to stop heating. The gas water heater according to any one of claims 1 to 10, wherein the mixing chamber is provided A spoiler or a damping member to thoroughly mix the air with the gas. The gas water heater according to any one of claims 1 to 11, further comprising a hood, the hood being connected to the heat exchanger and electrically connected to the exhaust port, A hood is used to collect and discharge the fumes generated by combustion with the burner. The gas water heater according to any one of claims 1 to 12, further comprising a buffer water tank, wherein the buffer water tank is disposed in the accommodating chamber, and the buffer water tank is located in a water flow direction Between the outlet and the hot water outlet, and communicating with the water outlet and the hot water outlet, respectively. The gas water heater according to any one of claims 1 to 13, wherein the heat exchanger comprises a first heat exchanger and a second heat exchanger, and the first heat exchanger is provided in the first Above the two heat exchangers and between the burner and the second heat exchanger.

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