Burner, burner device and gas water heater

Abstract

The present invention discloses a burner, a burner device and a gas water heater. The burner is applied to the gas water heater, and the burner includes: a main body that defines a chamber, an inlet for allowing preheated ambient gas to enter the chamber and an outlet communicating the chamber with the outside are provided on the main body, and both the inlet and the outlet communicate with the chamber; a gas injection assembly installed on the main body, and the gas injection assembly is configured to inject a gas mixture into the chamber so that the gas mixture burns in the chamber containing the ambient gas. The present invention enables the burner to burn more fully and can reduce the content of pollutants generated and emitted by the combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion heat exchange, and particularly to a burner, a burner device and a gas water heater. Background Art

[0002] A gas water heater is a device that heats cold water by burning gas. As a key component of the gas water heater, the burner directly affects the performance of the gas water heater.

[0003] Existing gas water heaters include a housing and a heat exchanger. A combustion chamber is formed inside the housing, and the burner is located in the combustion chamber. After the mixture of gas from a gas supply source and a combustion-supporting gas is ignited by the burner, combustion occurs in the combustion chamber. The heat generated in the combustion chamber is exchanged with cold water through the heat exchanger, converting the cold water into hot water at a suitable temperature.

[0004] However, when existing gas water heaters burn, high-temperature combustion occurs in a local small area in the combustion chamber, resulting in relatively high contents of pollutants such as carbon monoxide and nitrogen oxides in the exhausted flue gas. Summary of the Invention

[0005] The main object of the present invention is to provide a burner, a burner device and a gas water heater, so as to make the combustion more sufficient and reduce the content of pollutants generated and emitted by the combustion.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a burner applied to a gas water heater. The burner includes:

[0008] A body that defines a chamber, and an inlet for allowing preheated ambient gas to enter the chamber and an outlet for communicating the chamber with the outside are provided on the body;

[0009] A gas injection assembly is installed on the body, and the gas injection assembly is configured to inject a gas mixture into the chamber so that the gas mixture burns in the chamber containing ambient gas.

[0010] In this way, the burner provides a specific environment for the combustion of the gas mixture, such as a high-temperature and oxygen-deficient environment, etc., thereby enabling the gas mixture to perform MILD combustion. This MILD combustion can reduce the generation of pollutants such as carbon monoxide and nitrogen oxides, which is beneficial to environmental protection and the improvement of air quality.

[0011] In one alternative embodiment, the bottom of the body is open to form an inlet; in another alternative embodiment, the top of the body is open to form an outlet; or, in yet another alternative embodiment, the bottom of the body is open to form an inlet, and at the same time the top of the body is open to form an outlet.

[0012] In an optional embodiment, the body includes a plurality of connecting plate assemblies, which are connected to each other end to end along the circumference of the body to enclose a chamber. In this way, the plurality of connecting plate assemblies together constitute the body, the structure of a single connecting plate assembly is relatively simple, and the connecting plate assemblies are easy to disassemble or assemble, which is conducive to the arrangement of the gas injection assembly or other functional components.

[0013] In an optional embodiment, the gas injection assembly includes:

[0014] A distribution pipe, which is arranged on the main body and is used to introduce the fuel gas mixture;

[0015] The nozzle is communicated with the distribution pipe and extends into the chamber.

[0016] In this way, the gas mixture from the outside of the burner first enters the distribution pipe and then is sprayed into the chamber through the nozzle. The distribution pipe can play a role in uniform gas pressure and buffering for the nozzle, ensuring that the airflow state sprayed by the nozzle is relatively stable.

[0017] In an optional embodiment, the number of distribution pipes is at least two, and different distribution pipes are respectively arranged on different connection plate assemblies. In this way, the entry positions of the gas mixture can correspond to different connection plate assemblies, so that the gas mixture enters the chamber from different positions on the circumference of the body, thereby the gas mixture in the chamber is more evenly distributed.

[0018] In an optional embodiment, there are two distribution pipes, and the two distribution pipes are respectively arranged on two oppositely arranged connecting plate assemblies, so that the inlet positions of the gas mixture can be located at opposite positions, which is conducive to forming a gas mixture jet in the chamber.

[0019] In an optional embodiment, the distribution pipe is located on the side of the connecting plate assembly away from the chamber, and the nozzle penetrates the connecting plate assembly and leads into the chamber. In this way, the distribution pipe is arranged outside the connecting plate assembly to avoid the danger of explosion of the gas mixture in the distribution pipe due to high temperature.

[0020] In an optional embodiment, each distribution pipe is provided with a plurality of nozzles, and the plurality of nozzles are arranged at intervals along the length direction of the distribution pipe, so that the positions where the gas mixture enters the chamber can be spaced apart, which is conducive to the uniform distribution of the gas mixture in the chamber.

[0021] In an optional embodiment, the spraying directions of the nozzles are parallel to each other, which is conducive to the formation of a stable jet of the fuel gas mixture in the chamber.

[0022] In an optional embodiment, the two distribution pipes include a first distribution pipe and a second distribution pipe; the multiple nozzles include multiple first nozzles arranged on the first distribution pipe and multiple second nozzles arranged on the second distribution pipe; the projection of the first nozzle on the second distribution pipe is located in the gap between adjacent second nozzles. In this way, the nozzles will not be directly opposite to each other, and the interference between the jets ejected by each nozzle is small.

[0023] In an optional embodiment, a plurality of mounting holes communicating with the inner cavity of the distribution pipe are provided on the side wall of the distribution pipe, the number of the mounting holes corresponds to the number of the nozzles, and the nozzles are provided in the corresponding mounting holes. In this way, by providing mounting holes on the distribution pipe, the nozzles can be communicated with the inner cavity of the distribution pipe, and the hole walls of the mounting holes can fix and position the nozzles.

[0024] In an optional embodiment, the circumferential outer side wall of the nozzle has an outwardly protruding flange, and the flange abuts against the end surface of the mounting hole. In this way, the nozzle can abut against the end surface of the mounting hole through the flange, so that the nozzle is fixed in both the axial and radial directions.

[0025] In an optional embodiment, the nozzle is provided with spray holes penetrating through both ends of the nozzle in the axial direction, and the inner diameters of the spray holes are different at various locations along the axial direction of the nozzle. Since the airflow is compressed at the location with a smaller inner diameter of the spray hole, the airflow speed is faster, while the airflow speed is slower at the location with a larger inner diameter of the spray hole, by setting different apertures at various locations of the nozzle, the speed of the jet of the gas mixture can be adjusted when the gas mixture in the distribution pipe is ejected from the nozzle in a jet manner.

[0026] In an optional embodiment, the spray hole includes an inlet section, a diameter-changing section, and an outlet section which are sequentially connected along the spraying direction;

[0027] The inner diameter of the inlet section is larger than that of the outlet section, and the inner diameter of the variable diameter section gradually decreases from the inlet section to the outlet section. Since the inner diameter of the inlet section is larger than that of the outlet section, the inner diameter of the entire nozzle hole actually tends to decrease from the airflow inlet to the outlet of the nozzle. In this way, the gas mixture is accelerated from the distribution pipe through the nozzle hole and sprayed into the chamber, making it easier to generate the jet velocity required for MILD combustion in the chamber.

[0028] In an optional embodiment, the distribution tube comprises:

[0029] A square tube body, a nozzle is arranged on one side wall of the square tube body, and an opening is arranged on a side of the square tube body away from the nozzle;

[0030] The cover plate is arranged on the opening, and the cover plate and the opening are sealed and connected to form the inner cavity of the distribution pipe together with the square tube body.

[0031] In this way, the overall shape of the distribution pipe is set to be square. The shape of the distribution pipe is relatively regular, and the outer wall of the distribution pipe is mostly flat, which is convenient for cooperating with other components, thus facilitating the installation of the distribution pipe and the connecting plate assembly. In addition, the distribution pipe is assembled from different components such as a square pipe body and a cover plate, and the distribution pipe is relatively easy to produce and manufacture.

[0032] In an alternative embodiment, the side wall of the square pipe body with nozzles is detachably mounted on the connecting plate assembly.

[0033] In an alternative embodiment, the side wall of the square pipe body with nozzles extends along the axial direction of the square pipe body and forms a mounting flange protruding from the end face of the square pipe body. Connecting holes for mounting on the connecting plate assembly are provided on the mounting flange. In this way, the mounting structure extends from the length direction of the square pipe body to the outside of the end face of the square pipe body, and the area of the support surface formed by the mounting structure is relatively large, providing good support for the square pipe body.

[0034] In an alternative embodiment, the first end of the distribution pipe is a closed end, the second end of the distribution pipe is an air inlet for introducing a gas mixture, and the nozzles are arranged between the first end and the second end of the distribution pipe. In this way, the nozzles are arranged on the side of the distribution pipe, and there is an angle between the orientation of the nozzles and the gas flow direction of the distribution pipe. After the gas mixture enters the cavity of the distribution pipe, it will first fill the inside of the cavity of the distribution pipe and then be ejected from the nozzles. In this way, the influence of the gas mixture on the nozzles when it enters the distribution pipe is relatively small, and the jet state formed by the nozzles is relatively stable.

[0035] In an alternative embodiment, a pressure measurement port is further provided at the second end of the distribution pipe. The pressure measurement port is used to connect a pressure sensor, and the pressure sensor is used to detect the gas pressure inside the distribution pipe. In this way, the pressure sensor can measure the gas pressure in the distribution pipe.

[0036] In an alternative embodiment, the axial direction of the distribution pipe extends along the length direction of the connecting plate assembly. This setting can minimize the space occupied by the distribution pipe and make the size of the burner relatively compact.

[0037] In an alternative embodiment, the plurality of connecting plate assemblies include two side plate assemblies, the two side plate assemblies are arranged opposite to each other, and the gas injection assemblies are correspondingly arranged on the side plate assemblies. In this way, the two gas injection assemblies can be arranged at opposite positions, so that the gas mixture can evenly fill the entire chamber.

[0038] In an alternative embodiment, at least part of the structure of the side plate assembly is a heat-insulating component. This can prevent the heat in the chamber from being transferred to the gas injection assembly, avoid the premature combustion of the gas mixture in the gas injection assembly at high temperature, and thus improve the working safety of the burner.

[0039] In an alternative embodiment, the side plate assembly includes a heat insulation plate disposed on the side of the distribution pipe facing the chamber, and the heat insulation plate covers the entire side wall of the distribution pipe facing the chamber. In this way, the heat insulation plate can provide relatively comprehensive heat insulation protection for the gas injection assembly.

[0040] In an alternative embodiment, a gasket is clamped between the heat insulation plate and the distribution pipe, and through holes for the nozzles to pass through are formed in the gasket. The gasket can seal the gap between the nozzles and the chamber to prevent the gas in the chamber and the gas injection assembly from leaking to the outside of the burner.

[0041] In an alternative embodiment, a cooling assembly for cooling the chamber is provided on the body. The cooling assembly can cool the chamber of the burner to prevent a large amount of harmful substances from being generated due to too high a temperature of the gas in the chamber.

[0042] In an alternative embodiment, the cooling assembly includes at least one group of cooling pipes for circulating a cooling medium. The cooling medium has a relatively low temperature and can exchange heat with the inside of the chamber, thereby reducing the temperature inside the chamber.

[0043] In an alternative embodiment, the cooling pipes and the gas injection assembly are located on the same side of the body. On the one hand, this is beneficial to the layout inside the cavity, and on the other hand, the cooling pipes can also cool the gas injection assembly to prevent potential safety hazards caused by too high a temperature inside the gas injection assembly.

[0044] In an alternative embodiment, the cooling assembly includes at least two groups of cooling pipes exposed to the chamber, and each group of cooling pipes corresponds to a different gas injection assembly.

[0045] In an alternative embodiment, the cross-section of the cooling pipe is elliptical, and the short axis direction of the ellipse is along the thickness direction of the connecting plate assembly. In this way, the contact area between the cooling pipe and the gas in the chamber is relatively large, the heat exchange between the cooling pipe and the gas in the chamber is more sufficient, and the cooling effect is better.

[0046] In an alternative embodiment, the plurality of connecting plate assemblies further include two end plate assemblies and two side plate assemblies. The two end plate assemblies are oppositely arranged, and the end plate assemblies and the side plate assemblies are arranged alternately;

[0047] Cooling medium channels are provided on the end plate assemblies. The cooling pipes are connected between the two end plate assemblies. The cooling pipes and the cooling medium channels are communicated to form a circulating pipeline, and the cooling medium flows in the circulating pipeline.

[0048] In an optional embodiment, the end plate assembly includes an end plate and a waterway plate, the end plate and the waterway plate can cover each other, the waterway plate has a waterway groove, the notch of the waterway groove faces the end plate, and the waterway groove and the end plate together form a cooling medium channel. In this way, part of the structure in the end plate assembly will participate in the work of the cooling assembly, and the structure is simplified.

[0049] In an optional embodiment, each group of cooling pipes includes a first cooling pipe and a second cooling pipe, the cooling medium channels of the two end plate assemblies include a first connecting port and a second connecting port, the two ends of the first cooling pipe are respectively connected to the two first connecting ports, and the two ends of the second cooling pipe are respectively connected to the two second connecting ports.

[0050] In an optional embodiment, the two end plate assemblies include a first end plate assembly and a second end plate assembly, and the first end plate assembly is provided with a water inlet joint and a water outlet joint, the water inlet joint is connected to the first connection port of the coolant channel, and the water outlet joint is connected to the second connection port of the coolant channel.

[0051] In an optional embodiment, the first connection port and the second connection port on the second end plate assembly are connected to each other through a connecting channel, so that a loop can be formed between the first connection port and the second connection port of the second end plate assembly to facilitate the circulation of the cooling medium.

[0052] In an optional embodiment, the first cooling pipe and the second cooling pipe are arranged at intervals in the width direction of the side plate assembly, so that different cooling pipes can cool and exchange heat for different areas in the chamber, so that the chamber can be evenly cooled.

[0053] In an optional embodiment, the first cooling pipeline and the second cooling pipeline are respectively arranged on opposite sides of the gas injection assembly, which is also conducive to uniform cooling of the chamber.

[0054] In an optional embodiment, the side plate assembly includes a side plate, and the side plate is connected between the two end plate assemblies. The side plate and the end plate assembly can together form the main structure of the body.

[0055] In an optional embodiment, the side plate has a mounting groove extending along the circumference of the body, and the cooling pipe is embedded in the mounting groove, so that the cooling pipe can be fixed and positioned by the side plate.

[0056] In an optional embodiment, the edge of the side plate is folded toward the side away from the chamber to form a mounting end surface, so that the side plate can be connected to other components or structures outside the burner through the mounting end surface.

[0057] In an alternative embodiment, the burner further includes an ignition device which is disposed on the main body and extends into the interior of the chamber. Through the ignition device, the gas and the combustion-supporting gas in the gas water heater can be pre-ignited, so that the gas burns to generate flue gas after combustion preheating, and the flue gas after combustion preheating can be used as the ambient gas contained in the chamber.

[0058] In an alternative embodiment, an observation window is further provided on the main body. The observation window penetrates through the inner and outer sides of the chamber, and a transparent member is provided on the observation window. In this way, the combustion condition inside the burner can be observed through the observation window.

[0059] In a second aspect, the present invention provides a burner device, including:

[0060] A gas supply device including a first supply end and a second supply end;

[0061] A preheating burner communicated with the first supply end;

[0062] The burner as described above, the preheating burner and the chamber of the burner are communicated with each other to form a combustion chamber, and the gas injection assembly in the burner is connected to the second supply end.

[0063] In this way, the preheating burner can generate preheated ambient gas through the combustion of gas and combustion-supporting gas, and introduce the ambient gas into the chamber of the combustion chamber. In this way, the burner provides a specific environment for the combustion of the gas mixture through the ambient gas, so that the gas mixture undergoes MILD combustion. This MILD combustion can reduce the generation of pollutants such as carbon monoxide and nitrogen oxides, which is beneficial to environmental protection and the improvement of air quality.

[0064] In a third aspect, the present invention provides a gas water heater including the burner device as described above.

[0065] In an alternative embodiment, the gas water heater further includes a heat exchanger which is configured to have heat exchange with the combustion chamber to heat the water flowing through the interior of the heat exchanger.

[0066] In an alternative embodiment, the burner includes a cooling assembly, and the heat exchanger is communicated with the cooling assembly. In this way, the cooling assembly can use the water in the heat exchanger for cooling, and the cooling assembly can also use the high temperature inside the chamber to heat the water.

[0067] In a fourth aspect, the present invention provides a gas water heater including the burner device as described above, and

[0068] A controller for controlling the gas mixture to be ejected through the gas injection assembly when the ambient gas in the chamber meets the combustion conditions.

[0069] In this way, the controller can be used to control the operation of the burner, enabling the preheating burner in the gas water heater to operate first. After the environmental conditions in the chamber of the burner meet the combustion conditions, the gas mixture is then injected into the chamber, thereby achieving MILD combustion. This avoids the combustion process when the environmental conditions in the chamber of the burner do not reach the preset conditions, reducing the generation and emission of combustion pollutants.

[0070] In an alternative embodiment, the gas water heater further includes a shunt pipe connected between the second supply end of the gas water heater and the gas injection assembly of the burner; a control element disposed on the shunt pipe; and the controller is configured to trigger the control element to open when the ambient gas in the chamber meets the combustion conditions, so that the gas mixture is ejected by the gas injection assembly after passing through the shunt pipe.

[0071] In an alternative embodiment, the gas water heater further includes a temperature detection unit located above the burner. The temperature detection unit is electrically connected to the controller and is configured to obtain the temperature parameter of the combustion chamber; the controller is further configured to determine whether the ambient gas in the chamber meets the combustion conditions according to the temperature parameter of the combustion chamber received from the temperature detection unit. This enables the gas water heater to inject the gas mixture and perform MILD combustion after the chamber of the burner reaches a predetermined high-temperature and oxygen-deficient environment, reducing the generation and emission of combustion pollutants.

[0072] Since the gas flows upward during combustion, when the temperature detection unit is located above the burner, the temperature detection unit can detect the temperature of the main area where MILD combustion occurs in the combustion chamber, and the detection result is relatively accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0074] Figure 1 FIG. [X] is a schematic structural diagram of a gas water heater provided by an embodiment of the present application;

[0075] Figure 2 FIG. [Y] is a three-dimensional structural diagram of the burner in the gas water heater provided by an embodiment of the present application;

[0076] Figure 3 FIG. [Z] is an exploded structural diagram of the burner in the gas water heater provided by an embodiment of the present application;

[0077] Figure 4A cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the top view direction;

[0078] Figure 5 A cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the top view direction;

[0079] Figure 6 is Figure 5 a partial enlarged view of the position A shown;

[0080] Figure 7 A cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the front view direction;

[0081] Figure 8 is Figure 7 a partial enlarged view of the position B shown;

[0082] Figure 9 A cross-sectional view of another structure of the burner in the gas water heater provided by the embodiment of the present application in the front view direction;

[0083] Figure 10 A top view of the burner in the gas water heater provided by the embodiment of the present application;

[0084] Figure 11 is an exploded structure diagram showing the mating relationship of the distribution pipe and the connecting plate assembly;

[0085] Figure 12 An exploded structure diagram of the side plate assembly in the gas water heater provided by the embodiment of the present application;

[0086] Figure 13 A mating structure diagram of the cooling assembly and the connecting plate assembly in the gas water heater provided by the embodiment of the present application;

[0087] Figure 14 A cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the right view direction;

[0088] Figure 15 A cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the left view direction;

[0089] Figure 16a A left view of the burner in the gas water heater provided by the embodiment of the present application;

[0090] Figure 16b An exploded structure diagram of the observation window in the gas water heater provided by the embodiment of the present application;

[0091] Figure 17 A right view of the burner in the gas water heater provided by the embodiment of the present application;

[0092] Figure 18 The front view of the burner in the gas water heater provided by the embodiment of the present application;

[0093] Figure 19 The schematic diagram of the working principle of the gas water heater provided by the embodiment of the present application.

[0094] Explanation of the reference numerals:

[0095] 100 - Gas water heater; 300 - Gas supply device; 301 - First supply end; 302 - Second supply end; 303 - Fan; 304 - Premixer; 305 - Gas distributor; 306 - Shunt pipe; 307 - Solenoid valve; 308 - Temperature detection unit; 309 - Air inlet; 310 - Gas inlet; 312 - Gas distribution chamber; 400 - Combustion chamber; 401 - Preheating combustion zone; 402 - Mixing combustion zone; 403 - MILD combustion zone; 500 - Pre - burner; 600 - Heat exchanger; 601 - Cold water inlet; 602 - Hot water outlet; 800 - Smoke collecting hood; 801 - Exhaust pipe; 802 - Deflector wall; 900 - Extended housing;

[0096] 200 - Burner; 1 - Body; 10, 11 - Chambers; 105 - Ambient gas; 12 - Inlet; 13 - Outlet; 14 - Connecting plate assembly; 15 - Side plate assembly; 151 - Heat insulation plate; 152 - Side plate; 153 - Installation groove; 154 - Edge of the side plate; 155 - Sealing gasket; 1551 - Through - hole; 16 - Cooling assembly; 161 - Cooling pipe; 162 - First cooling pipe; 163 - Second cooling pipe; 164 - Connecting pipe; 17 - End plate assembly; 171 - Cooling medium channel; 1711 - Water inlet channel; 1712 - Water outlet channel; 172 - End plate; 173 - Water circuit plate; 174 - Water circuit groove; 175 - First connection port; 176 - Second connection port; 177 - Water inlet joint; 178 - Water outlet joint; 179 - Communication channel; 18 - First end plate assembly; 19 - Second end plate assembly;

[0097] 2 - Gas injection assembly; 21 - Distribution pipe; 211 - First distribution pipe; 212 - Second distribution pipe; 213 - Installation hole; 214 - Square pipe body; 215 - Cover plate; 216 - Opening; 217 - Side wall; 218 - Installation flange; 219 - Connection hole; 201 - First end; 202 - Second end; 203 - Pressure measurement port; 22 - Nozzle; 221 - First nozzle; 221' - Projection of the first nozzle; 222 - Second nozzle; 223 - Installation hole; 224 - Flange; 225 - Spray hole; 2251 - Inlet section; 2252 - Reducing section; 2253 - Outlet section;

[0098] 3 - Ignition device; 31 - Igniter; 32 - Auxiliary mounting; 33 - Observation window; 331 - Transparent part; 332 - Observation window body; 333 - Depression.

[0099] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0100] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0101] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0102] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0103] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0104] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0105] A gas water heater refers to a gas appliance that uses gas as fuel and transfers heat to the cold water flowing through the heat exchanger through combustion heating to achieve the purpose of preparing hot water. In existing gas water heaters, generally, the burner is arranged in the combustion chamber. Gas enters the burner and burns at the flame holes to form a flame. The air required for combustion can be provided by natural ventilation or forced air supply by a blower. The high-temperature flue gas generated by combustion flows through the heat exchanger. After absorbing heat and cooling in the heat exchanger, it is finally discharged from the smoke exhaust port. After the cold water flows through the heat exchanger, it is heated by the high-temperature flue gas in the heat exchanger and then output for use in bathing, etc.

[0106] However, the combustion carried out in the above combustion chamber is ordinary combustion, which is likely to form a high-temperature combustion area in a local small area of the combustion chamber, making the combustion in the whole combustion chamber uneven and incomplete, resulting in a relatively high content of carbon monoxide and nitrogen oxides in the flue gas discharged from the combustion.

[0107] Therefore, this application provides a gas water heater that can make the combustion more complete, thereby effectively reducing the emissions of carbon monoxide and nitrogen oxides and reducing the combustion noise of the gas water heater.

[0108] In the gas water heater of this application, the combustion carried out by the gas is high-temperature air combustion (High Temperature Air Combustion), also known as moderate or intense low oxygen dilution combustion (MILD combustion) or gentle combustion. The main characteristics of this combustion are: the chemical reaction mainly occurs in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than their autoignition temperature, and the maximum temperature rise during the combustion process is lower than their autoignition temperature. The volume fraction of oxygen is diluted to a very low concentration by the combustion products, usually 3% - 5%. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, so that the temperature of the whole combustion chamber is very uniform during this combustion, and the emissions of pollutants carbon monoxide and nitrogen oxides are greatly reduced.

[0109] Figure 1 For the structural schematic diagram of a gas water heater provided by an embodiment of this application, refer to Figure 1 , in the gas water heater 100, there is a burner device, and this burner device specifically includes a gas supply device 300, a preheating burner 500, and a burner 200; the chambers (not shown) of the preheating burner 500 and the burner 200 communicate with each other to form a combustion chamber 400 (as shown by the dotted line in the figure); the gas supply device 300 includes a first supply end 301 and a second supply end 302. The first supply end 301 communicates with the preheating burner 500, and the second supply end 302 is connected to the gas injection assembly 2 in the burner 200.

[0110] Among them, the burner device can be understood as the structure and components in the gas water heater for introducing and burning gas. By realizing the combustion of gas, the burner device can provide heat for other components in the gas water heater, thereby heating the water in the gas water heater. The burner device can be an independent component that can be disassembled and assembled separately in the gas water heater, or can be fixedly connected to other components or structures in the gas water heater to jointly form an integral structure.

[0111] Specifically, in the above solution, the first supply end 301 of the gas supply device 300 is communicated with the preheating burner 500, and the chamber of the preheating burner 500 and the chamber of the burner 200 are communicated with each other. The gas supply device 300 supplies a gas mixture into the chamber of the preheating burner 500. The gas mixture is ignited at the preheating burner 500 and burns in the chambers of the preheating burner 500 and the burner 200. The reaction products such as high-temperature flue gas generated by the combustion enter the chamber of the burner 200. The high-temperature flue gas in the reaction products is a gas that cannot participate in the combustion reaction anymore, so that a specific environment, such as a high-temperature and oxygen-deficient environment, is generated in the chamber of the burner 200.

[0112] When the second supply end 302 of the gas supply device 300 injects the gas mixture into the chamber of the burner 200 through the gas injection component 2 in the burner 200, the gas mixture can form a high-speed jet. The high-temperature flue gas contained in the chamber of the burner 200 is mixed with the gas mixture jet, which can dilute the gas mixture, so as to provide a specific environment for the combustion of the gas mixture, such as a high-temperature and oxygen-deficient environment. Thus, the gas mixture will perform MILD combustion. The MILD combustion has a low reaction rate, less local heat release, uniform heat flux distribution, low combustion peak temperature and extremely low noise. Compared with the small-area local high-temperature combustion in the prior art, this combustion occurs in a large area, even the entire chamber, the flame front disappears, and the generation of pollutants such as carbon monoxide and nitrogen oxides is significantly reduced.

[0113] Refer to Figure 1 , in some embodiments, the gas water heater 100 further includes components such as an extension housing 900, a heat exchanger 600, a smoke collecting hood 800, and a smoke exhaust pipe 801.

[0114] Among them, an auxiliary chamber (not shown) is defined inside the extension housing 900. One end of the auxiliary chamber is communicated with the heat exchanger 600, and the other end is communicated with the chamber of the burner 200. In this case, the auxiliary chamber in the extension housing 900, the preheating burner 500, and the chamber of the burner 200 are communicated with each other to form a combustion chamber 400.

[0115] It can be understood that the present application does not limit the chamber height dimension of the burner 200. When the chamber height dimension can meet the space required for MILD combustion, the above-mentioned extension housing 900 is not needed. Therefore, in the case where the extension housing 900 is not provided, MILD combustion only occurs in the burner 200; in the case where the extension housing 900 is provided, MILD combustion only occurs in the auxiliary chamber of the extension housing 900, or MILD combustion occurs simultaneously in the chamber of the burner 200 and the auxiliary chamber of the extension housing 900.

[0116] The present application takes the gas water heater 100 including the extension housing 900 as an example for illustration. In this case, the auxiliary chamber of the extension housing 900, the preheating burner 500 and the chamber of the burner 200 communicate with each other to form the combustion chamber 400. For other cases, it is similar here and will not be elaborated further.

[0117] In addition, for the cold water and hot water mentioned in the present application, the temperature of the hot water is higher than that of the cold water. The cold water can be, for example, the water flowing out of the tap of the household water pipe. The hot water, according to the user's usage requirements, can be, for example, water at about 40°-50° for bathing. The present application does not specifically limit the temperatures of the cold water and hot water, as long as the temperature of the hot water is higher than that of the cold water and the hot water can meet the user's usage requirements.

[0118] Refer to Figure 1 , the heat exchanger 600 is configured to have heat exchange with the combustion chamber 400 to heat the water flowing through the inside of the heat exchanger 600. Specifically, the heat exchanger 600 is connected to the burner 200, or the heat exchanger 600 is connected to the extension housing 900, so that the heat generated in the combustion chamber 400 enters the heat exchanger 600. The heat exchanger 600 includes a cold water inlet 601 and a hot water outlet. Among them, the cold water inlet 601 is used to communicate with the cold water inlet pipe (not shown) in the user's home, and the hot water outlet is used to communicate with the hot water outlet pipe (not shown) in the user's home. In the embodiment of the present application, the heat exchanger 600 can absorb the heat generated in the combustion chamber 400 and transfer this heat to the water to be heated.

[0119] Generally, the hot water outlet of the heat exchanger 600 is provided on the heat exchanger 600. In some other examples, for example, in Figure 1 , the hot water outlet 602 is located on the burner 200. This is because there is a cooling component 16 on the burner 200 for cooling the chamber 10. Connecting the heat exchanger 600 to the cooling component 16 can introduce the water that has undergone heat exchange in the heat exchanger 600 into the cooling component 16, and use the heat in the chamber of the burner 200 to conduct heat exchange on the water again, so that the water temperature is further increased to improve the working efficiency of the gas water heater 100.

[0120] Further, in the embodiments of the present application, the smoke collecting hood 800 and the exhaust pipe 801 are sequentially connected to the upper end of the combustion chamber 400 along the direction of the flue gas flow. For example, the smoke collecting hood 800 and the exhaust pipe 801 are sequentially connected to the heat exchanger 600. The smoke collecting hood 800 can be used to collect exhaust gases such as the flue gas discharged from the heat exchanger 600, and the exhaust pipe 801 is used to discharge the exhaust gases such as the flue gas from the gas water heater 100.

[0121] Referring to Figure 1 , in a possible implementation manner, the smoke collecting hood 800 is a hood-shaped member with one end open, and the hood-shaped member is configured to appropriately reduce the cross-sectional area from the upstream side to the downstream side of the flue gas flow, so as to facilitate the collection of gas. For example, a diversion wall 802 is provided on the smoke collecting hood 800, and the diversion wall 802 is inclined towards the heat exchanger 600 to facilitate the diversion of the airflow flowing from the heat exchanger 600 to the smoke collecting hood 800. The open end of the smoke collecting hood 800 is connected to the heat exchanger 600, and the end of the smoke collecting hood 800 away from the open end is communicated with one end opening of the exhaust pipe 801. In this way, the exhaust gases such as the flue gas generated in the combustion chamber 400 are first fully heat-exchanged through the heat exchanger 600, then concentrated by the smoke collecting hood 800 and discharged by the exhaust pipe 801. It can be understood that the cross-sectional area of the smoke collecting hood 800 includes but is not limited to the above-mentioned setting method, and the cross-sectional area of the smoke collecting hood 800 may also be unchanged in the direction of the flue gas flow.

[0122] Figure 2 Schematic three-dimensional structure diagram of the burner in the gas water heater provided by the embodiment of the present application, Figure 3 Exploded structure diagram of the burner in the gas water heater provided by the embodiment of the present application, Figure 4 Cross-sectional view of the burner in the gas water heater provided by the embodiment of the present application in the top view direction.

[0123] In the embodiments of the present application, referring to Figure 2 , Figure 3 , Figure 4 , the burner 200 may include a main body 1 and a gas injection assembly 2. Among them, the main body 1 defines a chamber 10, and an inlet 12 and an outlet 13 are provided on the main body 1. Both the inlet 12 and the outlet 13 are communicated with the chamber 10. Among them, the inlet 12 allows the preheated ambient gas to enter the chamber 10, and the outlet communicates the chamber with the outside.

[0124] The gas injection assembly 2 is installed on the main body 1, and the gas injection assembly 2 is configured to inject the gas mixture into the chamber 10 so that the gas mixture burns in the chamber 10 containing the ambient gas.

[0125] Among them, the ambient gas is a gas that does not participate in the combustion reaction. For example, it can be the relatively high-temperature flue gas generated after the combustion of the fuel gas mixture, etc. It should be noted that the ambient gas includes but is not limited to high-temperature flue gas, and can also be other types of gases that do not react with the fuel gas mixture.

[0126] In the above solution, referring to Figure 4 , in the chamber 10, there is an ambient gas 105. When the gas injection assembly 2 injects the fuel gas mixture into the chamber 10, the fuel gas mixture G can form a jet with a relatively high speed, and the ambient gas 105 contained in the chamber 10 mixes with the jet of the fuel gas mixture G, which can dilute the fuel gas mixture G. In this way, it is used to provide a specific environment for the combustion of the fuel gas mixture, such as a high-temperature and oxygen-deficient environment, etc. Thus, the fuel gas mixture G will undergo MILD combustion. This MILD combustion has a low reaction rate, less local heat release, a uniform heat flux distribution, a low combustion peak temperature, and extremely low noise. Compared with the small-area local high-temperature combustion in the prior art, the reaction occurs in a large area, even throughout the entire chamber, the flame front disappears, and the generation of pollutants such as carbon monoxide and nitrogen oxides is significantly reduced.

[0127] It should be noted that in Figure 4 , for the convenience of observation, the ambient gas 105 is schematically shown as a mass, but in fact, since the ambient gas 105 is gaseous, it will fill every corner of the chamber 10.

[0128] In the embodiment of the present application, the chamber 10 of the body 1 is used to accommodate the ambient gas, which means that a chamber 10 is formed inside the body 1, and this chamber 10 can be used to accommodate the ambient gas. In addition, the body 1 has an inlet 12 and an outlet 13 that communicate with the chamber 10. Among them, the inlet 12 allows the externally preheated ambient gas to enter the chamber 10, and the outlet 13 can discharge the gas in the chamber 10 from the burner 200.

[0129] Referring to Figure 2 , for the convenience of gas flow, the inlet 12 and the outlet 13 can have different height positions. Specifically, in the height direction of the burner 200, the height of the inlet 12 relative to the bottom of the burner 200 is lower than the height of the outlet 13 relative to the bottom of the burner 200. The setting method of the inlet 12 and the outlet 13 can be referred to Figure 2 shown. The bottom of the body 1 is open to form the inlet 12; and the top of the body 1 is open to form the outlet 13. In this way, the inlet 12 and the outlet 13 are oppositely arranged, which is more conducive to the gas flow inside the burner 200.

[0130] It can be understood that the formation manners of the inlet 12 and the outlet 13 include but are not limited to the opening of the bottom and the top of the main body 1. For example, the inlet 12 can be formed by the opening of the bottom of the main body 1, and the outlet 13 is an opening provided on the main body 1; or, the inlet 12 can be an opening provided on the main body 1, and the outlet 13 is formed by the opening of the top of the main body 1.

[0131] In the embodiment of the present application, the main body 1 includes a plurality of connecting plate assemblies 14. The connecting plate assemblies 14 are connected end to end along the circumferential direction of the main body 1 to enclose a chamber 10. The number of the connecting plate assemblies 14 is not limited herein, as long as the ends of the connecting plate assemblies 14 are connected pairwise along the circumferential direction of the main body 1 to form a frame shape. It can be understood that the ends of the connecting plate assemblies 14 refer to the ends of the connecting assemblies along the circumferential direction of the main body 1.

[0132] In this way, the plurality of connecting plate assemblies 14 together constitute the main body 1. The structure of a single connecting plate assembly 14 is relatively simple, and it is convenient to disassemble or assemble between the connecting plate assemblies 14, which is beneficial to the arrangement of the gas injection assembly 2 or other functional components.

[0133] In order to make the appearance of the entire gas water heater 100 more beautiful and the size more compact, the number of the connecting plate assemblies 14 can be an even number, and the connecting plate assemblies 14 are arranged pairwise opposite to each other so that the main body 1 is a rectangular frame. Further, with reference to Figure 2 shown, the main body 1 can include four connecting plate assemblies 14, and the connecting plate assemblies 14 are arranged pairwise opposite to each other so that the main body 1 is a rectangular frame.

[0134] In the embodiment of the present application, the gas injection assembly 2 is installed on the main body 1. Specifically, in Figure 2 the gas injection assembly 2 can be installed on the connecting plate assembly 14 to inject the gas mixture into the chamber 10 of the burner 200.

[0135] Further, with reference to Figure 2 、 Figure 3 , the gas injection assembly 2 includes: a distribution pipe 21, the distribution pipe 21 is arranged on the main body 1, and the distribution pipe 21 is used for introducing the gas mixture; a nozzle 22, the nozzle 22 is communicated with the distribution pipe 21 and extends into the chamber 10. In this way, the gas mixture from the outside first enters the distribution pipe 21 and then is sprayed into the chamber 10 through the nozzle 22. Especially when the number of the nozzles 22 is multiple, the arrangement of the distribution pipe 21 can make the spraying states of the nozzles 22 communicated with the same distribution pipe 21 the same.

[0136] Among them, the distribution pipe 21 can be communicated with the gas supply device 300 described later. The distribution pipe 21 can play a role in evenly distributing the gas pressure and buffering for the nozzle 22, ensuring that the gas flow state sprayed by the nozzle 22 is relatively stable.

[0137] In the embodiments of the present application, the number of the distribution pipes 21 can be at least two, and different distribution pipes 21 are respectively arranged on different connecting plate assemblies 14. Since the distribution pipes 21 are arranged on different connecting plate assemblies 14, if the nozzles 22 are arranged on the distribution pipes 21, the gas mixture can enter at positions corresponding to different connecting plate assemblies 14, so that the gas mixture enters the chamber 10 from different positions in the circumferential direction of the body 1, and thus the gas mixture in the chamber 10 is more evenly distributed.

[0138] Refer to Figure 3 , as an alternative embodiment, the number of the distribution pipes 21 can be two, and the two distribution pipes 21 are respectively arranged on two oppositely arranged connecting plate assemblies 14. If the nozzles 22 are arranged on the distribution pipes 21, the gas mixture can enter at opposite positions, which is beneficial to form a gas mixture jet in the chamber 10.

[0139] In the embodiments of the present application, the distribution pipes 21 are arranged outside the connecting plate assemblies 14. In other words, the distribution pipes 21 are arranged on the side of the connecting plate assemblies 14 facing away from the chamber 10, and the nozzles 22 penetrate through the connecting plate assemblies 14 and extend into the chamber 10. In order to avoid the risk of explosion of the gas mixture in the distribution pipes 21 due to high temperature or the like, the distribution pipes 21 are arranged outside the connecting plate assemblies 14. The nozzles 22 penetrate through the connecting plate assemblies 14 and extend into the chamber 10 specifically means that the end of the nozzle 22 facing the inner side of the chamber 10 is exposed into the chamber 10, or the end of the nozzle 22 facing the inner side of the chamber 10 enters the chamber 10, so that the gas flowing through the nozzles 22 can enter the chamber 10.

[0140] It can be understood that for the connection manner between the nozzles 22 and the distribution pipes 21, the nozzles 22 can be directly arranged on the distribution pipes 21 to realize the connection between the nozzles 22 and the distribution pipes 21, or the nozzles 22 can be connected to the distribution pipes 21 through structures such as connecting hoses to realize the connection between the nozzles 22 and the distribution pipes 21. Hereinafter, the case where the nozzles 22 are arranged on the distribution pipes 21 will be taken as an example for description.

[0141] Figure 5 is a cross-sectional view in the top view direction of the burner in the gas water heater provided by the embodiments of the present application, Figure 6 is Figure 5 the partial enlarged view of the position A shown in Figure 5 and Figure 6 shown, in the embodiments of the present application, a plurality of nozzles 22 are arranged on each distribution pipe 21, and the plurality of nozzles 22 are arranged at intervals along the length direction of the distribution pipe 21. For example Figure 5 on the connecting plate assembly 14 near the upper side of the paper surface, four nozzles 22 are provided, and the four nozzles 22 are arranged at intervals along the length direction L of the distribution pipe 21; Figure 5On the connecting plate assembly 14 near the lower side of the paper surface, five nozzles 22 are provided. The five nozzles 22 are arranged at intervals along the length direction L of the distribution pipe 21, so that the positions where the gas mixture enters the chamber 10 are spaced apart, which is conducive to the uniform distribution of the gas mixture in the chamber 10.

[0142] Furthermore, the injection directions of the multiple nozzles 22 are parallel to each other to facilitate the formation of a stable jet of the gas mixture in the chamber 10. Specifically, the injection directions of all the nozzles 22 extending into the chamber 10 can be parallel to each other. Or it can also be that the injection directions of the nozzles 22 corresponding to the same connecting plate assembly 14 are parallel to each other.

[0143] Figure 7 It is a cross-sectional view in the main viewing direction of the burner in the gas water heater provided by the embodiment of the present application. Figure 8 is Figure 7 the partial enlarged view at B shown. Figure 9 It is a cross-sectional view in the main viewing direction of the burner with another structure in the gas water heater provided by the embodiment of the present application.

[0144] Referring to Figure 5 、 Figure 7 、 Figure 9 shown, as an optional way, when the number of the distribution pipes 21 is two, the two distribution pipes 21 may include a first distribution pipe 211 and a second distribution pipe 212; for example, taking Figure 5 the distribution pipe 21 on the upper side of the paper surface as the second distribution pipe 212 and the distribution pipe 21 on the lower side of the paper surface as the first distribution pipe 211 as an example for illustration, the multiple nozzles 22 include multiple first nozzles 221 arranged on the first distribution pipe 211 and multiple second nozzles 222 arranged on the second distribution pipe 212. Among them, Figure 7 and Figure 9 in, the projection 221' of the first nozzle 221 on the second distribution pipe 212 is shown by a dotted line. Referring to Figure 7 、 Figure 9 , the projection 221' of the first nozzle 221 on the second distribution pipe 212, that is, the projection 221' of the first nozzle 221 is located in the gap between two adjacent second nozzles 222. In this way, the nozzles 22 are not directly facing each other, and the interference between the jets ejected by each nozzle 22 is small.

[0145] It can be understood that the projection 221' of the first nozzle 221 being located in the gap between two adjacent second nozzles 222 includes Figure 7 the situation where the first nozzle 221 and the second nozzle 222 are at the same height shown in Figure 9 and also includes the situation where the height of the first nozzle 221 and the height of the second nozzle 222 are different shown in

[0146] In the embodiment of the present application, referring toFigure 3 , Figure 5 , Figure 6 , in order to install the nozzle 22 and connect the nozzle 22 to the inner cavity of the distribution pipe 21, a plurality of mounting holes 223 communicating with the inner cavity of the distribution pipe 21 are formed in the side wall of the distribution pipe 21. The number of the mounting holes 223 corresponds to the number of the nozzles 22, and the nozzles 22 are arranged in the corresponding mounting holes 223. It can be understood that the mounting holes 223 are located on the side wall of the distribution pipe 21 facing the chamber 10, facilitating the insertion of the nozzles 22 into the chamber 10.

[0147] Furthermore, in order to prevent the nozzles 22 from falling off the distribution pipe 21, an outwardly protruding flange 224 is provided on the circumferential outer side wall of the nozzles 22, and the flange 224 abuts against the end surface of the mounting hole.

[0148] In the embodiment of the present application, in order to spray the gas mixture in the distribution pipe 21 into the chamber 10, the nozzle 22 may be provided with spray holes 225 penetrating through the axial two ends of the nozzle 22, and the inner diameters of the spray holes 225 at various positions along the axis of the nozzle 22 are not equal. Since the air flow is compressed at the part where the inner diameter of the spray hole 225 is small and the air flow velocity is fast, while the air flow velocity is slow at the part where the inner diameter of the spray hole 225 is large, therefore, by setting different hole diameters at various positions of the nozzle 22, the inner diameter of the spray hole 225 is not equal along the axis, and the spraying speed of the gas mixture in the distribution pipe 21 into the chamber 10 can be adjusted.

[0149] In order to accelerate the spraying speed of the gas mixture into the chamber 10, the spray hole 225 may include an inlet section 2251, a reduced-diameter section 2252, and an outlet section 2253 that are sequentially communicated along the spraying direction; wherein, the inner diameter of the inlet section 2251 is larger than the inner diameter of the outlet section 2253, and the inner diameter of the reduced-diameter section 2252 gradually decreases along the direction from the inlet section 2251 to the outlet section 2253. Since the inner diameter of the inlet section 2251 is larger than the inner diameter of the outlet section 2253, actually, the inner diameter of the entire spray hole 225 has a tendency to become smaller from the air flow inlet to the outlet of the nozzle 22. In this way, the gas mixture is accelerated and sprayed into the chamber 10 through the spray hole 225 from the distribution pipe 21, so that it is easier to generate the jet velocity required for MILD combustion in the chamber 10.

[0150] In the above solution, the inner diameter of the reduced-diameter section 2252 includes but is not limited to continuously decreasing gradually, for example, it can also be gradually decreasing in a stepped manner, etc. Keeping the inner diameter of the inlet section 2251 unchanged is conducive to the stable entry of the gas mixture in the distribution pipe 21 into the spray hole 225, and keeping the inner diameter of the outlet section 2253 unchanged is conducive to the stable spraying of the gas mixture in the spray hole 225 into the chamber 10. It can be understood that the inner diameter of the spray hole 225 includes but is not limited to the above setting methods, for example, it can also be that the inner diameter gradually decreases from the inlet to the outlet of the nozzle 22, and in this way, the effect of accelerating the gas mixture air flow can also be achieved.

[0151] Figure 10 This is a top view of the burner in the gas water heater provided by the embodiment of the present application. Figure 11 This is an exploded structural schematic diagram showing the mating relationship between the distribution pipe and the connecting plate assembly. Among them, Figure 11 Taking one of the distribution pipes 21 as an example for illustration, in the case where the burner 200 includes multiple distribution pipes 21, the structures of the remaining distribution pipes are similar to that of Figure 11 the distribution pipe 21 described, and will not be elaborated here.

[0152] In the embodiment of the present application, with reference to Figure 3 , Figure 10 , Figure 11 , the distribution pipe 21 includes: a square pipe body 214, one side wall 217 of the square pipe body 214 is used to set the nozzle 22, and the side of the square pipe body 214 facing away from the nozzle 22 has an opening 216; a cover plate 215, the cover plate 215 is covered on the opening, and the cover plate 215 and the opening are sealed and connected to jointly enclose the inner cavity of the distribution pipe 21 with the square pipe body 214.

[0153] For the convenience of processing and manufacturing the distribution pipe 21, the distribution pipe 21 can be formed in a split manner. For example, the distribution pipe 21 can include a square pipe body 214 and a cover plate 215. The square pipe body 214 is hollow inside, and the cover plate 215 is hermetically covered on the opening to form a square pipe body. Setting the overall shape of the distribution pipe 21 to be square can facilitate the installation of the distribution pipe 21 and the connecting plate assembly 14. It can be understood that the pipe body of the distribution pipe 21 includes but is not limited to being square, and can also be set to a cylindrical pipe body according to needs.

[0154] In the embodiment of the present application, in order to facilitate the installation of the inlet and outlet of the nozzle 22 on the square pipe body 214 and the connecting plate assembly 14 respectively, the side wall 217 of the square pipe body 214 where the nozzle 22 is provided is detachably installed on the connecting plate assembly 14.

[0155] Furthermore, the side wall 217 of the square pipe body 214 where the nozzle 22 is provided extends along the axial direction of the square pipe body 214 and forms a mounting flange 218 protruding from the end face of the square pipe body 214. A connection hole 219 for mounting on the connecting plate assembly 14 is provided on the mounting flange 218. By providing the mounting flange 218 and forming the connection hole 219 on the mounting flange 218, the structure for mounting the square pipe body 214 does not occupy the inner cavity of the square pipe body 214 for accommodating gas, and the structure is simple. At the same time, the mounting structure extends from the length direction of the square pipe body 214 to the outside of the end face of the square pipe body 214, and the area of the support surface formed by the mounting structure is relatively large, providing good support for the square pipe body 214. Figure 11The mounting flange 218 shown in [Figure] protrudes from the end face in the length direction of the square pipe body 214, and this will not affect the installation of the cooling pipe 161 described later.

[0156] In the embodiment of the present application, referring to Figure 10 , the first end 201 of the distribution pipe 21 is a closed end, the second end 202 of the distribution pipe 21 is an air inlet for introducing the gas mixture, and the nozzle 22 is arranged between the first end 201 and the second end 202 of the distribution pipe 21. In this way, the nozzle 22 is arranged on the side of the distribution pipe 21, and there is an included angle between the orientation of the nozzle 22 and the gas flow direction of the distribution pipe 21, for example, they are perpendicular to each other. After the gas mixture enters the cavity of the distribution pipe 21, it will first fill the inside of the cavity of the distribution pipe 21 and then be ejected by the nozzle 22. In this way, the influence of the gas mixture on the nozzle 22 when it enters the distribution pipe 21 is relatively small, and the jet state formed by the nozzle 22 is relatively stable.

[0157] Furthermore, a pressure measurement port 203 is also arranged at the second end 202 of the distribution pipe 21. The arrangement of the pressure measurement port 203 can measure and monitor the pressure entering the distribution pipe 21. As an optional way, a pressure sensor can be connected to the pressure measurement port 203 to detect the gas pressure inside the distribution pipe 21.

[0158] In the embodiment of the present application, the axial direction of the distribution pipe 21 can extend along the length direction M of the connecting plate assembly 14. Such an arrangement can minimize the space occupied by the distribution pipe 21.

[0159] Figure 12 [Figure] is an exploded structural schematic diagram of the side plate assembly in the gas water heater provided by the embodiment of the present application. Among them, when the connecting plate assembly has two side plate assemblies 15, the structures of the two side plate assemblies 15 are the same. In Figure 12 only the structural schematic diagram of one of the side plate assemblies 15 is shown.

[0160] In the embodiment of the present application, referring to Figure 12 , a plurality of connecting plate assemblies can include two side plate assemblies 15, the two side plate assemblies 15 are arranged oppositely, and the gas injection assemblies 2 are correspondingly arranged on the side plate assemblies 15. In this way, the two gas injection assemblies can be arranged at opposite positions, so that the gas mixture can uniformly fill the entire chamber 10.

[0161] In the embodiment of the present application, in order to prevent the heat in the chamber 10 from escaping outside the chamber 10, causing waste and posing a safety hazard to the user, at least part of the structure in the side plate assembly 15 is a heat-insulating component.

[0162] Specifically, for example, referring to Figure 12, the side plate assembly 15 includes a heat insulation plate 151, the heat insulation plate 151 is arranged on the side of the side plate 152 facing the chamber 10, and the heat insulation plate 151 covers the side wall of the side plate 152 facing the chamber 10. Further, a gasket 155 is clamped between the side plate 152 and the distribution pipe 21, and a through hole 1551 for the nozzle 22 to pass through is formed in the gasket 155. It can be understood that the gasket 155 is used to enhance the airtightness of the nozzle 22.

[0163] In the embodiment of the present application, in order to cool the chamber 10, a cooling assembly for cooling the chamber 10 may further be provided on the body 1. The cooling assembly 16 can cool the chamber 10 of the burner to prevent a large amount of harmful substances from being generated due to the too high gas temperature in the chamber 10.

[0164] Figure 13 It is a schematic diagram of the cooperation structure of the cooling assembly and the connecting plate assembly in the gas water heater provided by the embodiment of the present application. Refer to Figure 13 , the cooling assembly 16 may include at least one set of cooling pipes 161, and a cooling medium flows through the cooling pipes 161. When the cooling medium flows through the cooling pipes 161, the chamber 10 can be cooled.

[0165] Further, in order to make the layout inside the cavity more reasonable, facilitate the installation of the cooling pipes 161, and at the same time facilitate the cooling pipes 161 to cool the gas injection assembly 2 to avoid potential safety hazards caused by too high temperature inside the gas injection assembly 2, the cooling pipes 161 are arranged on the side of the body 1 where the gas injection assembly 2 is provided. The cooling pipes 161 can extend along the length direction N of the side plate assembly 15, so that the length of the cooling pipes 161 can be set as long as possible without affecting the gas combustion reaction inside the cavity.

[0166] In the embodiment of the present application, the cooling assembly 16 may include at least two sets of cooling pipes 161, and each set of cooling pipes 161 corresponds to a different gas injection assembly 2. Figure 13 The case where the cooling assembly 16 includes two sets of cooling pipes 161 is shown. It can be understood that the number of the cooling pipes 161 can be 3 sets, 4 sets or even more, and when at least two sets of cooling pipes 161 are provided, the cooling effect on the chamber 10 is better.

[0167] In the embodiment of the present application, the cooling assembly 16 can be arranged outside the chamber 10. For example, the cooling assembly 16 can be connected to the outer wall of the body 1 and arranged around the circumference of the body 1 to achieve the purpose of cooling the chamber 10 within the circumferential range.

[0168] Alternatively, a part of the structure of the cooling component 16 can also be exposed inside the chamber 10. Since a part of the structure of the cooling component 16 is located inside the chamber 10, the chamber 10 can be directly cooled, and the cooling efficiency is relatively high.

[0169] Figure 14 It is a cross-sectional view in the right viewing direction of the burner in the gas water heater provided by the embodiment of the present application; Figure 15 It is a cross-sectional view in the left viewing direction of the burner in the gas water heater provided by the embodiment of the present application. Refer to Figure 13 、 Figure 14 As shown in, the cooling pipe 161 is exposed in the chamber 10 to directly cool the chamber 10.

[0170] Furthermore, in order to further enhance the cooling effect of the cooling pipe 161, the cross-section of the cooling pipe 161 is oval, and the short axis direction of the oval is along the thickness direction P of the connecting plate assembly 14. Since the surface area of the outer wall portion of the cooling pipe 161 along the long axis direction is larger than the surface area of the outer wall portion of the cooling pipe 161 along the short axis direction, with such a setting, the outer wall portion of the cooling pipe 161 along the long axis direction is exposed in the chamber 10, whereby the contact area between the cooling pipe 161 and the gas in the chamber 10 can be relatively large, the heat exchange between the cooling pipe 161 and the gas in the chamber 10 is more sufficient, and the cooling effect is better.

[0171] In the embodiment of the present application, since the gas water heater 100 is used to convert cold water into hot water, water can be used as the cooling medium to reduce costs, and the heat in the chamber 10 where the combustion reaction occurs can be further fully utilized to heat the water.

[0172] In the embodiment of the present application, continue to refer to Figure 13 , the plurality of connecting plate assemblies 14 further include two end plate assemblies 17. The two end plate assemblies 17 are arranged oppositely, and the end plate assemblies 17 and the side plate assemblies 15 are arranged alternately. Specifically, the arrangement manner of each connecting plate assembly 14 in the circumferential direction of the main body 1 is: end plate assembly 17, side plate assembly 15, end plate assembly 17, side plate assembly 15, and the two end plate assemblies 17 are located at opposite positions.

[0173] Figure 16a It is the left view of the burner in the gas water heater provided by the embodiment of the present application, Figure 17 It is the right view of the burner in the gas water heater provided by the embodiment of the present application, Figure 18 It is the front view of the burner in the gas water heater provided by the embodiment of the present application.

[0174] In the embodiment of the present application, in order to further improve the cooling effect of the cooling component 16, refer to Figure 13 、 Figure 16a 、Figure 17 , Figure 18 , a cooling medium channel 171 may be provided on the end plate assembly 17, and the cooling pipe 161 may be connected between two end plate assemblies 17. The cooling pipe 161 and the cooling medium channel 171 are communicated to form a circulation pipeline, and the cooling medium flows in the circulation pipeline. The cooling assemblies are simultaneously distributed at positions corresponding to the end plate assemblies 17 and the side plate assemblies 15, and the end plate assemblies 17 and the side plate assemblies 15 are alternately arranged, so that the distribution of the cooling assemblies 16 on the body 1 is more uniform.

[0175] In the embodiment of the present application, referring to Figure 13 , the end plate assembly 17 includes an end plate 172 and a water channel plate 173. The end plate 172 and the water channel plate 173 can be covered with each other. The water channel plate 173 has a water channel groove 174, and the notch of the water channel groove 174 faces the end plate 172. The water channel groove 174 and the end plate 172 together enclose the cooling medium channel 171. Forming the cooling medium channel 171 through the water channel groove 174 on the water channel plate 173 and the end plate 172 makes the structure of the end plate assembly 17 relatively compact compared with the solution in which the cooling medium channel 171 and the end plate assembly 17 are separately formed, which is convenient for the installation of the end plate assembly 17 and the cooling pipe 161.

[0176] Regarding the relative positional relationship between the end plate 172 and the water channel plate 173, exemplarily, the end plate 172 can be closer to the inside of the chamber 10 than the water channel plate 173, that is, the notch of the water channel groove 174 can face the chamber 10. In this way, the inner cavity of the cooling medium channel 171, that is, the groove cavity of the water channel groove 174, is outside the end plate 172, and the space in the chamber 10 occupied by the cooling medium channel 171 can be avoided as much as possible.

[0177] In the embodiment of the present application, each group of cooling pipes 161 includes a first cooling pipe 162 and a second cooling pipe 163. The cooling medium channels 171 of the two end plate assemblies 17 both include a first connection port 175 and a second connection port 176. The two ends of the first cooling pipe 162 are respectively communicated with the two first connection ports 175, and the two ends of the second cooling pipe 163 are respectively communicated with the two second connection ports 176. In this way, the first cooling pipe 162 is communicated with different cooling medium channels 171 through the two first connection ports 175, and the second cooling pipe 163 is communicated with the cooling medium channel 171 through the two second interfaces.

[0178] Further, continue to refer to Figure 13, the two end plate assemblies 17 include a first end plate assembly 18 and a second end plate assembly 19. An inlet joint 177 and an outlet joint 178 are provided on the first end plate assembly 18. The inlet joint 177 communicates with the first connection port 175, and the outlet joint 178 communicates with the second connection port 176. The inlet joint 177 can be connected to a cooling medium supply source or the like, or can also be connected to the hot water outlet on the heat exchanger 600 through a connecting pipe (not shown) or the like. The cooling medium discharged from the outlet joint 178, such as water, is heated by the heat in the chamber 10 and becomes hot water, which can be directly used or used for other purposes.

[0179] It should be noted that with reference to Figure 16a , in the cooling medium channel 171 on the first end plate assembly 18, there are an independent inlet channel 1711 and an outlet channel 1712. Among them, the inlet channel 1711 communicates with the first connection port 175 and the inlet joint 177 on the first end plate assembly 18, and the outlet channel 1712 communicates with the second connection port 176 and the outlet joint 178 on the first end plate assembly 18. In other words, on the first end plate assembly 18, the inlet channel 1711 and the outlet channel 1712 do not directly communicate. After connecting the cooling pipe 161 to the first end plate assembly 18 and the second end plate assembly 19, the inlet channel 1711 and the outlet channel 1712 can be indirectly communicated through the circulation of the cooling pipe 161, the cooling medium channel 171 on the second end plate assembly 19, etc.

[0180] In the embodiment of the present application, with reference to Figure 17 as shown, the first connection port 175 and the second connection port 176 are shown in dotted lines. The first connection port 175 and the second connection port 176 on the second end plate assembly 19 can communicate with each other through a communication channel 179. It can be understood that by making the first connection port 175 and the second connection port 176 communicate through the communication channel 179, the cooling medium flowing in from the first connection port 175 can pass through the communication channel 179 and return to the cooling medium channel 171 on the first end plate assembly 18 through the second connection port 176.

[0181] The working process of the cooling assembly 16 is introduced below.

[0182] With reference to Figure 13 、 Figure 16aThe dashed arrow represents the flow direction of the cooling medium, such as water, in the cooling pipe 161. The water as the cooling medium enters the water inlet passage 1711 through the water inlet joint 177 and flows along the extension direction of the water inlet passage 1711 to fill the entire water inlet passage 1711; the water in the water inlet passage 1711 is split by two first cooling pipes 162, that is, the water in the water inlet passage 1711 enters the cooling medium passage 171 of the second end plate assembly 19 through the two first cooling pipes 162 respectively. As the cooling medium passage 171 of the second end plate assembly 19 is gradually filled with water, the water in the cooling medium passage 171 of the second end plate assembly 19 passes through two second cooling pipes 163 respectively and flows into the water outlet passage 1712 of the first end plate assembly 18. The water in the water outlet passage 1712 can flow out of the first end plate assembly 18 through the water outlet joint 178. Through the above process, a cooling circulation pipeline for cooling the interior of the chamber 10 is formed. The water as the cooling medium flows in from the water inlet joint 177, exchanges heat with the heat in the chamber 10 when flowing through the cooling circulation pipeline, and the temperature of the water flowing out from the water outlet joint 178 is higher than that of the water flowing in from the water inlet joint 177.

[0183] Based on the above description, while cooling the chamber 10, the cooling assembly 16 can also increase the temperature of the water as the cooling medium. Therefore, in the embodiment of the present application, referring to Figure 1 , the gas water heater 100 further includes a connecting pipe 164. The connecting pipe 164 is located outside the gas water heater 100, and the connecting pipe 164 is connected between the heat exchanger 600 and the cooling assembly 16. Specifically, one end of the connecting pipe 164 is connected to the water outlet of the heat exchanger 600, and the other end is connected to the water inlet joint 177. The water heated by the heat exchanger 600 can enter the cooling assembly 16 through the connecting pipe 164 and the water inlet joint 177 for secondary heat exchange, so as to further increase the temperature of the water, thereby improving the heating efficiency of the gas water heater 100.

[0184] In the embodiment of the present application, referring to Figure 14 , the first cooling pipe 162 and the second cooling pipe 163 are spaced apart in the width direction W of the side plate assembly 15, so that the cooling of the chamber 10 by the first cooling pipe 162 and the second cooling pipe 163 is more uniform.

[0185] Furthermore, in order to make the layout on the side plate assembly 15 more compact, the first cooling pipe 162 and the second cooling pipe 163 are respectively arranged on opposite sides of the gas injection assembly 2. Exemplarily, referring to Figure 14 shown, the first cooling pipe 162 is located above the gas injection assembly 2, the second cooling pipe 163 is located below the gas injection assembly 2, and the gas injection assembly 2 is located in the gap between the first cooling pipe 162 and the second cooling pipe 163.

[0186] In the embodiment of the present application, with reference to Figure 13 and Figure 14 , the side plate assembly 15 may include a side plate 152, and the side plate 152 is connected between two end plate assemblies 17. In this way, the side plate assembly 15 and the end plate assembly 17 can be connected to define a chamber 10.

[0187] Furthermore, the side plate 152 has a mounting groove 153 extending along the circumferential direction of the body 1, and the cooling pipe 161 is embedded in the mounting groove 153. It can be understood that in the above solution, a part of the wall of the cooling pipe 161 facing away from the mounting groove 153 is exposed in the chamber 10, and the cooling effect on the chamber 10 is better.

[0188] In the embodiment of the present application, the side plate 152 is a sheet metal part, and the mounting groove 153 can be formed by bending the side plate 152, which can make the processing of the side plate 152 and the mounting groove 153 relatively simple and the cost relatively low. Furthermore, with reference to Figure 13 , the edge 154 of the side plate is folded towards the side away from the chamber 10 to form a mounting end face, so as to facilitate the connection between the side plate assembly 15 and other components in the gas water heater 100. It can be understood that Figure 13 it can be the upper and lower end edges of the side plate 152 that are folded towards the side away from the chamber 10, or it can also be the folding of other end edges of the side plate 152.

[0189] In the embodiment of the present application, with reference to Figure 17 and Figure 18 , an ignition device 3 is further provided on the burner 200. The ignition device 3 is arranged on the body, such as the end plate assembly 17, and the ignition device 3 extends into the chamber 10. The position of the ignition device 3 on the end plate assembly 17 can be referred to Figure 17 . The ignition device 3 and the water channel groove 174 are arranged at intervals to avoid interference with each other. Through the ignition device 3, the gas and the combustion-supporting gas in the gas water heater can be pre-ignited, so that the gas burns and generates flue gas after combustion preheating, and the flue gas after combustion preheating can be used as the ambient gas contained in the chamber 10.

[0190] With reference to Figure 7 , the ignition device 3 includes an igniter 31 and an auxiliary mounting member 32. The ignition device 3 can be installed in a conventional manner. For example, the igniter 31 can be passed through the cover-shaped auxiliary mounting member 32, and the auxiliary mounting member 32 can be detachably connected to the end plate assembly 17 for installation.

[0191] Figure 16b It is a schematic exploded view of the observation window in the gas water heater provided by the embodiment of the present application.

[0192] In the embodiment of the present application, with reference to Figure 8 andFigure 16b To more conveniently observe the combustion condition in the combustion chamber 400, the gas water heater 100 may include at least one observation window 33. The installation position of the observation window 33 may be determined according to actual needs. For example, the observation window 33 may be arranged on the body 1. The observation window 33 penetrates through the inner and outer sides of the chamber 10, and a transparent member 331 is arranged on the observation window 33.

[0193] Further, with reference to Figure 8 、 Figure 16a and Figure 16b as shown, the observation window 33 may be installed on the end plate assembly 17. The observation window 33 includes an observation window body 332 and a transparent member 331. A recess 333 recessed in a direction away from the end plate assembly 17 is provided on the observation window body 332. The recess 333 can be used to accommodate the transparent member 331. In addition, a through hole is provided at the bottom of the recess 333, and the inner edge dimension of the through hole is smaller than the outer edge dimension of the transparent member 331. Through holes are also provided at positions on the end plate assembly 17 corresponding to the transparent member 331.

[0194] During specific installation, first place the transparent member 331 into the recess 333, and install the observation window body 332 on the end plate assembly 17. It should be noted that it is necessary to make the through holes on the observation window body 332, the transparent member 331, and the through holes on the end plate assembly 17 correspond in position so that the user can observe the inside of the combustion chamber 400. It can be understood that the structure and position of the observation window 33 are not limited to the above solution, and can be specifically selected according to actual needs.

[0195] Figure 19 FIG. is a schematic diagram of the working principle of the gas water heater provided by the embodiment of the present application.

[0196] In the embodiment of the present application, with reference to Figure 19 , the gas supply device 300 includes a blower 303, a premixer 304, and a gas distributor 305. The premixer 304 is provided with a gas inlet 310, an air inlet 309, and an outlet. As an optional implementation manner, the inlet of the blower 303 is communicated with the outlet of the premixer 304, and the outlet of the blower 303 is communicated with the gas distributor 305. Gas enters the premixer 304 through the gas inlet 310, air enters the premixer 304 through the air inlet 309, the air and the gas are mixed in the premixer 304 to form a gas mixture and flow out from the outlet, and then enter the inside of the blower 303 through the inlet of the blower 303. After mixing, the gas mixture enters the gas distributor 305 through the outlet of the blower 303. It can be understood that the above solution mixes the gas mixture before it enters the blower 303. The present application is not limited thereto, and other mixing methods may also be used.

[0197] Further, the gas distributor 305 is located below the preheating burner 500 and is configured to evenly deliver the premixed gas mixture in the pre - mixer 304 to the preheating burner 500. Specifically, referring to Figure 19 , the gas distributor 305 defines a gas distribution chamber 312. One end of the gas distribution chamber 312 is in communication with the preheating burner 500, and the other end of the gas distribution chamber 312 is in communication with the air outlet of the blower 303. Specifically, the lower end of the preheating burner 500 is open, and the upper end of the gas distributor 305 is open and matches the open lower end of the preheating burner 500. In this way, the gas mixture gradually diffuses during the process of moving towards the preheating burner 500 in the gas distribution chamber 312, which is conducive to evenly delivering the gas mixture to the preheating burner 500.

[0198] In the embodiment of the present application, the preheating burner 500 is in communication with the gas distribution chamber 312. The gas mixture from the gas distribution chamber 312 enters the preheating burner 500 and is ignited by the ignition device 3. The products generated by its combustion, such as high - temperature flue gas, etc., create an atmosphere for MILD combustion in the combustion chamber 400.

[0199] Since when implementing MILD combustion, it is necessary to utilize pre - heated ambient gas, such as post - combustion flue gas, to provide a high - temperature and low - oxygen environment. When the ambient gas is not pre - heated to a sufficient preset temperature, even if the gas mixture is sprayed into the ambient gas at a high speed, MILD combustion may still not be achieved. Therefore, in order to reduce or avoid non - MILD combustion processes in the gas water heater 100, the present application also provides another gas water heater, which is provided with components such as a controller. The controller can change the gas flow state of the burner in the gas water heater, thereby avoiding non - MILD combustion processes in the burner device.

[0200] At this time, the gas water heater 100 provided by the present application further includes a controller (not shown), and the controller is configured to control the gas mixture to be ejected via the gas injection assembly 2 when the ambient gas in the chamber meets the combustion conditions.

[0201] At this time, the gas water heater 100 provided by the present application further includes a shunt pipe 306. The shunt pipe 306 is connected between the second supply end 302 of the gas water heater 100 and the gas injection assembly 2. When the gas supply device 300 includes the gas distributor 305, the open upper end of the gas distributor 305 forms the first supply end 301 of the gas supply device 300, and the air outlet of the gas distributor 305 forms the second supply end 302 of the gas supply device 300. Specifically, the shunt pipe 306 can be connected between the gas injection assembly 2 and the air outlet of the gas distributor 305.

[0202] The gas water heater 100 further includes a control element, which can be arranged on the shunt pipe 306; the controller is used to trigger the control element to open when the ambient gas in the chamber meets the combustion conditions, so that the gas mixture passes through the shunt pipe and is ejected by the gas injection assembly 2. Specifically, in some embodiments, the combustion conditions may refer to the conditions capable of performing MILD combustion. Exemplarily, the combustion conditions may be that the ambient gas in the chamber rises to a preset temperature, etc.

[0203] In the embodiment of the present application, the controller is specifically used to determine whether the ambient gas meets the combustion conditions according to the temperature parameter detected by the temperature detection unit 308. The temperature parameter may be the detected temperature value, or the temperature difference between the temperature value detected this time and the temperature value detected last time, etc.

[0204] When the temperature parameter meets the above-mentioned combustion conditions, the controller controls the connection state of the shunt pipe 306 to make the shunt pipe 306 connected, and the second supply end 302 passes the gas mixture into the gas injection assembly 2 through the shunt pipe 306.

[0205] When the temperature parameter does not meet the above-mentioned combustion conditions, the controller controls the connection state of the shunt pipe 306 to close the shunt pipe 306.

[0206] Exemplarily, a solenoid valve 307 is arranged on the shunt pipe 306 as a control element. The solenoid valve 307 is electrically connected to the controller, and the controller is used to control the connection state of the shunt pipe 306 through the solenoid valve 307.

[0207] Refer to Figure 19 As shown, the gas water heater 100 further includes a temperature detection unit 308. The temperature detection unit 308 is located above the burner, and the temperature detection unit is electrically connected to the controller. The temperature detection unit is used to obtain the temperature parameter of the combustion chamber; the controller is further used to determine whether the ambient gas in the chamber meets the combustion conditions according to the temperature parameter of the combustion chamber received from the temperature detection unit.

[0208] Specifically, the sensing end of the temperature detection unit 308 is arranged in the combustion chamber, for example, arranged in the auxiliary chamber in the extension housing 900. The temperature detection unit 308 is electrically connected to the controller, and the controller is used to control the connection state of the shunt pipe 306 according to the temperature detected by the temperature detection unit 308.

[0209] The gas water heater 100 of the present application includes an extension housing 900. Thus, the temperature detection unit 308 can be located above the burner 200, for example, can be located in the auxiliary chamber defined by the extension housing 900, so as to facilitate detecting whether the temperature required for MILD combustion is reached in the auxiliary chamber.

[0210] Specifically, the controller is electrically connected to the temperature detection unit 308 and the gas supply device 300. After the gas water heater 100 is started, the controller is configured to control the gas supply device 300 to supply a gas mixture to the preheating burner 500, and perform pre-combustion in the cavity of the preheating combustion chamber 400. When the temperature detected by the temperature detection unit 308 is greater than the start temperature of MILD combustion, the controller controls the solenoid valve 307 on the shunt pipe 306 to open, so that the gas mixture in the gas supply device 300 enters the chamber 10 of the burner 200 through the gas injection assembly 2, so that MILD combustion is performed in the burner 200 and / or the auxiliary chamber.

[0211] The working process of the gas water heater 100 of the present application will be described below.

[0212] As Figure 19 shown, after the gas water heater 100 is started by the user, the controller controls the gas supply device 300 to start. The gas and air will be mixed in the premixer 304 in a certain proportion, and the gas mixture will be transported to the gas distributor 305 by the drive of the fan 303. The gas distributor 305 is communicated with the preheating burner 500. After the gas mixture diffuses to the preheating burner 500, it is ignited by the ignition device 3. Among them, in the area of the chamber of the burner 200 close to the preheating burner 500, for example, the lower area in the chamber, a preheating combustion zone 401 is generated. The high-temperature flue gas and other tail gases generated by the combustion in the preheating burner 500 enter the chamber of the burner 200 and the auxiliary chamber of the extension housing 900. The high-temperature flue gas can create a specific environment in the chamber of the burner 200 and the auxiliary chamber, such as a high-temperature and oxygen-deficient environment.

[0213] In addition, the temperature detection unit 308 measures whether the set temperature for MILD combustion is reached in the combustion chamber 400. When the set temperature is reached, the controller controls the solenoid valve 307 to open, and the gas mixture in the gas distributor 305 will be respectively introduced into the preheating burner 500 and the burner 200. The preheating burner 500 keeps burning and continuously generates high-temperature flue gas. The gas mixture is sprayed into the chamber of the burner 200 through the gas injection assembly 2. The area corresponding to the gas injection assembly 2 in the chamber of the burner 200 is the mixed combustion zone 402. In the chamber 10 of the burner 200, a part of the sprayed gas mixture and the unburned gas mixture in the preheating combustion zone 401 will burn in the mixed combustion zone 402, and another part of the gas mixture is sprayed upward and enters the auxiliary chamber of the extension housing 900. The upper part of the chamber of the burner 200 and the auxiliary chamber of the extension housing 900 are called the MILD combustion zone 403.

[0214] After the above-mentioned other part of the gas mixture enters the MILD combustion zone 403, it is mixed with and diluted by the high-temperature flue gas, and MILD combustion is formed in the MILD combustion zone 403. The high-temperature flue gas generated by this MILD combustion is heat-exchanged by the heat exchanger 600, and then discharged to the outside through the smoke collecting hood 800 and the smoke exhaust pipe 801.

[0215] In the above solution, the combustion chamber 400 can be divided into three combustion zones: a preheating combustion zone 401, a mixing combustion zone 402, and a MILD combustion zone 403. Combustion reaction occurs in the preheating combustion zone 401 to generate high-temperature flue gas, and the high-temperature flue gas enters the MILD combustion zone 403 upward, so that the MILD combustion zone 403 reaches the temperature required for MILD combustion. The mixing combustion zone 402 belongs to a transitional combustion zone, and the unburned gas mixture in the preheating combustion zone 401 and the partially injected gas mixing zone burn in the mixing combustion zone 402 to further heat the MILD combustion zone 403. In the combustion reaction carried out in the MILD combustion zone 403, the injected gas mixture fills the entire MILD combustion zone 403. Since the temperature in this zone is higher than the autoignition point of the gas mixture, the gas mixture will undergo MILD combustion. The combustion is mild, the flame front disappears, the temperature of the entire MILD combustion zone 403 is very uniform, the reaction rate during the combustion process is low, the local heat release is small, the heat flux distribution is uniform, the combustion peak temperature is low, and the noise is extremely small.

[0216] The above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A burner, which is applied to a gas water heater, is characterized in that The burner comprises: A body, wherein the body defines a chamber, and the body is provided with an inlet for allowing the preheated ambient gas to enter the chamber and an outlet connecting the chamber with the outside; A gas injection assembly is installed on the body, and the gas injection assembly is constructed to inject a gas mixture into the chamber so that the gas mixture burns in the chamber containing the ambient gas; the gas injection assembly includes a distribution pipe and a nozzle, the distribution pipe is arranged on the body, and the distribution pipe is used to introduce the gas mixture; the nozzle is connected to the distribution pipe and extends into the chamber; the nozzle is provided with a spray hole passing through both axial ends of the nozzle, the spray hole includes an inlet section, a reducing section and an outlet section which are connected in sequence along the injection direction, the inner diameter of the inlet section is larger than the inner diameter of the outlet section, and the inner diameter of the reducing section gradually decreases along the direction from the inlet section to the outlet section.

2. The burner according to claim 1, characterized in that, The bottom of the body is open to form the inlet; and / or, The top of the body is open to form the outlet.

3. The burner according to claim 1 or 2, characterized in that, The body includes a plurality of connecting plate assemblies, and the connecting plate assemblies are connected to each other end to end along the circumference of the body to enclose the chamber.

4. The burner according to claim 3, characterized in that, The number of the distribution pipes is at least two, and different distribution pipes are respectively arranged on different connection plate assemblies.

5. The burner according to claim 4, characterized in that, The number of the distribution pipes is two, and the two distribution pipes are respectively arranged on two oppositely arranged connecting plate assemblies.

6. The burner according to any one of claims 4-5, characterized in that, The distribution pipe is located at a side of the connection plate assembly facing away from the chamber, and the nozzle penetrates through the connection plate assembly and leads into the interior of the chamber.

7. The burner according to claim 6, characterized in that, Each of the distribution pipes is provided with a plurality of the nozzles, and the plurality of the nozzles are arranged at intervals along the length direction of the distribution pipe.

8. The burner according to claim 7, characterized in that, The spraying directions of the nozzles are parallel to each other.

9. The burner according to claim 8, characterized in that, The two distribution pipes include a first distribution pipe and a second distribution pipe; the multiple nozzles include multiple first nozzles arranged on the first distribution pipe and multiple second nozzles arranged on the second distribution pipe; the projection of the first nozzle on the second distribution pipe is located in the gap between adjacent second nozzles.

10. The burner according to any one of claims 7-9, characterized in that, A plurality of mounting holes communicating with the inner cavity of the distribution pipe are provided on the side wall of the distribution pipe. The number of the mounting holes corresponds to the number of the nozzles, and the nozzles are arranged in the corresponding mounting holes.

11. The burner according to claim 10, characterized in that, A flange protruding outward is provided on the circumferential outer side wall of the nozzle, and the flange abuts against the end surface of the mounting hole.

12. The burner according to claim 1, characterized in that, The inner diameters of the spray holes at different locations along the axial direction of the nozzle are different.

13. The burner according to claim 3, characterized in that, The distribution pipe comprises: A square tube body, wherein the nozzle is arranged on one side wall of the square tube body, and an opening is arranged on a side of the square tube body away from the nozzle; A cover plate is disposed on the opening, and the cover plate and the opening are sealed and connected to form an inner cavity of the distribution pipe together with the square tube body.

14. The burner according to claim 13, characterized in that, A side wall of the square tube body provided with the nozzle is detachably mounted on the connecting plate assembly.

15. The burner according to claim 14, characterized in that, On one side wall of the square tube body where the nozzle is provided, it extends along the axial direction of the square tube body and forms a mounting flange protruding from the end face of the square tube body. Connection holes for mounting on the connecting plate assembly are provided on the mounting flange.

16. The burner according to claim 1, characterized in that, The first end of the distribution pipe is a closed end, the second end of the distribution pipe is an air inlet for introducing the gas mixture, and the nozzle is arranged between the first end and the second end of the distribution pipe.

17. The burner according to claim 16, characterized in that, A pressure measurement port is further provided at the second end of the distribution pipe. The pressure measurement port is used to connect a pressure sensor. Wherein, the pressure sensor is used to detect the gas pressure inside the distribution pipe.

18. The burner according to claim 3, characterized in that, The axial direction of the distribution pipe extends along the length direction of the connecting plate assembly.

19. The burner according to claim 3, characterized in that, The multiple connecting plate assemblies include two side plate assemblies which are arranged opposite to each other, and the gas injection assembly is correspondingly arranged on the side plate assemblies.

20. The burner according to claim 19, characterized in that, The side plate assembly includes a heat insulation plate. The heat insulation plate is arranged on the side of the distribution pipe facing the chamber, and the heat insulation plate covers the entire side wall of the distribution pipe facing the chamber.

21. The burner according to claim 20, characterized in that, A sealing gasket is clamped between the heat insulation plate and the distribution pipe. A through hole for the nozzle to pass through is provided on the sealing gasket.

22. The burner according to claim 3, characterized in that, A cooling assembly for cooling the chamber is provided on the body.

23. The burner according to claim 22, characterized in that, The cooling assembly includes at least one group of cooling pipes, and a cooling medium is used to flow inside the cooling pipes.

24. The burner according to claim 23, characterized in that, The cooling pipes and the gas injection assembly are located on the same side of the body.

25. The burner according to claim 23 or 24, characterized in that, The cooling assembly includes at least two groups of cooling pipes exposed to the chamber, and each group of cooling pipes corresponds to a different gas injection assembly respectively.

26. The burner according to claim 25, characterized in that, The cross-section of the cooling pipe is elliptical, and the short axis direction of the ellipse is along the thickness direction of the connecting plate assembly.

27. The burner according to claim 23, characterized in that, The multiple connecting plate assemblies further include two end plate assemblies and two side plate assemblies. The two end plate assemblies are arranged opposite to each other, and the end plate assemblies and the side plate assemblies are arranged alternately; Cooling medium channels are provided on the end plate assemblies. The cooling pipes are connected between the two end plate assemblies. The cooling pipes and the cooling medium channels are communicated to form a circulation pipeline, and the cooling medium flows in the circulation pipeline.

28. The burner according to claim 27, characterized in that, The end plate assembly includes an end plate and a water channel plate. The end plate and the water channel plate can be covered with each other. The water channel plate has a water channel groove, and the notch of the water channel groove faces the end plate. The water channel groove and the end plate jointly enclose the cooling medium channel.

29. The burner according to claim 27 or 28, characterized in that, Each group of cooling pipes includes a first cooling pipe and a second cooling pipe. The cooling medium channels of the two end plate assemblies both include a first connection port and a second connection port. The two ends of the first cooling pipe are respectively communicated with the two first connection ports, and the two ends of the second cooling pipe are respectively communicated with the two second connection ports.

30. The burner according to claim 29, characterized in that, The two end plate assemblies include a first end plate assembly and a second end plate assembly. An inlet joint and an outlet joint are provided on the first end plate assembly. The inlet joint is communicated with the first connection port, and the outlet joint is communicated with the second connection port.

31. The burner according to claim 30, characterized in that, The first connection port and the second connection port on the second end plate assembly are communicated with each other through a communication channel.

32. The burner according to claim 29, characterized in that, The first cooling duct and the second cooling duct are disposed at intervals in a width direction of the side plate assembly.

33. The burner according to claim 32, characterized in that, The first cooling pipeline and the second cooling pipeline are respectively arranged on opposite sides of the gas injection assembly.

34. The burner according to claim 27, wherein, The side plate assembly includes a side plate connected between two end plate assemblies.

35. The burner according to claim 34, wherein, The side plate has a mounting groove extending along the circumference of the body, and the cooling pipe is embedded in the mounting groove.

36. The burner according to claim 34 or 35, characterized in that, The edge of the side plate is folded toward a side away from the chamber to form a mounting end surface.

37. The burner according to claim 1, characterized in that, It also includes an ignition device, which is arranged on the body and extends into the interior of the chamber.

38. The burner according to claim 1, characterized in that, The main body is also provided with an observation window, which runs through both inner and outer sides of the chamber, and a transparent piece is provided on the observation window.

39. A burner device, characterized in that, include: A gas supply device, comprising a first supply end and a second supply end; a preheating burner, connected to the first supply end; The burner according to any one of claims 1 to 38, wherein the preheating burner and the chamber of the burner are interconnected to form a combustion chamber, and the gas injection assembly in the burner is connected to the second supply end.

40. A gas water heater, characterized in that, Comprising a burner assembly as claimed in claim 39.

41. The gas water heater according to claim 40, characterized in that, A heat exchanger is also included. The heat exchanger is configured to exchange heat with the combustion chamber to heat water flowing through the heat exchanger.

42. The gas water heater according to claim 41, characterized in that, The burner includes a cooling assembly, and the heat exchanger is in communication with the cooling assembly.

43. A gas water heater, characterized in that, Comprising the burner device as claimed in claim 39, the gas water heater further comprises: The controller is used to control the fuel gas mixture to be sprayed out through the gas injection assembly when the ambient gas in the chamber meets the combustion conditions.

44. The gas water heater according to claim 43, characterized in that, The gas water heater also includes: A shunt pipe connected between the second supply end of the gas supply device and the gas injection assembly of the burner; A control element, arranged on the shunt pipe; The controller is used to trigger the control element to open when the ambient gas in the chamber meets the combustion conditions, so that the fuel gas mixture passes through the diverter pipe and is sprayed out by the gas injection assembly.

45. The gas water heater according to claim 43 or 44, characterized in that, It also includes a temperature detection unit, which is located above the burner and is electrically connected to the controller; The temperature detection unit is used to obtain the temperature parameters of the combustion chamber; The controller is further configured to determine whether the ambient gas in the chamber meets a combustion condition according to the temperature parameter of the combustion chamber received from the temperature detection unit.

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