Gas distribution device, burner, water heater and water heater control method

Abstract

The present invention discloses a gas distribution device, a burner, a water heater and a control method for the water heater, wherein the gas distribution device comprises: a shell, the shell is formed with a gas distribution chamber and an air inlet and an air outlet respectively connected to the gas distribution chamber; a valve is movably arranged on the shell in a first position and a second position; and a driving mechanism is connected to the valve driving mechanism, and is used to drive the valve to move and switch between the first position and the second position, when the valve is in the first position, the valve closes the air flow channel from the air inlet to the gas distribution chamber, and when the valve moves and switches from the first position to the second position, the valve gradually opens the air flow channel from the air inlet to the gas distribution chamber. The present invention can adjust the gas supply of the gas distribution device, and avoid the problem of harmful gas generated when the gas supply does not meet the heat load requirements.

Description

Technical Field

[0001] The present invention relates to the field of water heaters, and in particular to a gas distribution device, a burner, a water heater and a control method for the water heater. Background Art

[0002] Gas water heaters, also known as gas water heaters, use gas as fuel and transfer heat to cold water flowing through a heat exchanger through combustion heating to prepare hot water. Gas water heaters are mainly composed of a valve assembly, a main burner, a low-fire burner, a heat exchanger, a safety device, etc. The valve assembly controls the entire working procedure of the water heater, which includes a water valve, a gas valve, a micro switch, and an igniter. The gas supply of the water heater is usually controlled by a gas valve. Since the state of the gas valve is relatively certain and the state of the gas valve cannot be controlled in real time, the amount of gas supplied does not match the amount of gas required for the actual heat load state of the burner, which can easily lead to incomplete combustion of the gas in the water heater and the generation of harmful gases. Summary of the invention

[0003] The main purpose of the present invention is to provide a gas distribution device, a burner, a water heater and a control method for the water heater, aiming to improve the problem that the gas supply of the existing water heater is inconvenient to adjust.

[0004] To achieve the above object, the present invention provides a gas distribution device for a burner, the gas distribution device comprising:

[0005] A housing, wherein the housing is formed with a gas distribution chamber and a gas inlet and a gas outlet respectively connected to the gas distribution chamber;

[0006] a valve movably disposed on the housing between a first position and a second position; and

[0007] A driving mechanism is connected to the valve driving mechanism and is used to drive the valve to move and switch between the first position and the second position. When the valve is in the first position, the valve closes the air flow channel from the air inlet to the gas distribution chamber. When the valve moves and switches from the first position to the second position, the valve gradually opens the air flow channel from the air inlet to the gas distribution chamber.

[0008] Optionally, the gas distribution device further comprises:

[0009] a partition plate, arranged on the shell, the partition plate divides the gas distribution chamber into an air inlet cavity connected to the air inlet and an air outlet cavity connected to the air outlet, and the air vents are connected to the air inlet cavity and the air outlet cavity respectively;

[0010] When the valve is in the first position, the valve closes the vent hole. When the valve moves from the first position to the second position, the valve gradually opens the air flow channel formed by the vent hole.

[0011] Optionally, the partition includes:

[0012] a plate body, the vent holes being arranged on the plate body; and

[0013] A first guide wall, wherein the first guide wall has a first side edge and a second side edge arranged opposite to each other, the first side edge of the first guide wall is connected to the plate body, the second side edge of the first guide wall is connected to the inner wall surface of the shell, and the plate body and the first guide wall separate the gas distribution chamber into the air inlet chamber and the air outlet chamber.

[0014] Optionally, one end of the first guide wall away from the plate body extends toward the air inlet, so that a first guide surface for guiding the airflow toward the air vent is formed on the first guide wall.

[0015] Optionally, the partition further comprises:

[0016] a second guide wall, wherein the second guide wall has a third side and a fourth side that are arranged opposite to each other, the third side of the second guide wall is connected to an end of the plate body away from the first guide wall, and the fourth side of the second guide wall extends away from the air inlet and is connected to the inner wall surface of the shell;

[0017] The first guide wall, the plate body and the second guide wall separate the gas distribution chamber into the air inlet cavity and the air outlet cavity. From the third side edge to the fourth side edge of the second guide wall, the air flow channel area of ​​the air outlet cavity gradually increases.

[0018] Optionally, a clearance groove is provided on the housing, and when the valve is switched to the second position, the valve is embedded in the clearance groove;

[0019] And / or, a sink groove is provided on the shell, and when the valve is switched to the first position, an edge of the valve is embedded in the sink groove.

[0020] Optionally, a plurality of the gas distribution chambers are provided in the shell, and each of the gas distribution chambers is provided with an air inlet and an air outlet connected thereto.

[0021] Optionally, a nozzle is provided on the air outlet, and the number of the nozzles is multiple, and the multiple nozzles are arranged at intervals.

[0022] Optionally, the inner diameter of the nozzle close to the valve is smaller than the inner diameter of the nozzle far from the valve.

[0023] Optionally, the air inlet and the air outlet are arranged at an angle with each other, and a second guide surface for guiding the airflow toward the air outlet is provided on the inner wall surface of the shell.

[0024] The present invention also provides a burner, comprising:

[0025] A housing, wherein a first combustion chamber and a second combustion chamber that are interconnected are formed in the housing;

[0026] a preheating burner, disposed in the housing, for burning to form a mixed gas, so as to heat the air in the first combustion chamber to a preset temperature, and transport the air to the second combustion chamber;

[0027] The gas distribution device as mentioned above is arranged in the outer shell, and is used to inject gas into the second combustion chamber so that a high-temperature air combustion reaction occurs in the second combustion chamber.

[0028] Optionally, the burner further comprises:

[0029] The premixer is arranged on the shell and is used for receiving the fuel gas and air for premixing to form a mixed gas and then conveying the mixed gas to the preheating burner and the gas distribution device.

[0030] Optionally, the burner further comprises:

[0031] A distributor is arranged on the shell and connected to the premixer, and is used for conveying the mixed gas formed by the premixer to the preheating burner and the gas distribution device respectively.

[0032] The present invention also provides a water heater, comprising:

[0033] Body;

[0034] The burner as described above is arranged in the machine body; and

[0035] The heat exchanger is arranged on the machine body and connected to the second combustion chamber, and is used for exchanging heat with the flue gas generated by the high-temperature air combustion reaction of the burner.

[0036] Optionally, the water heater further comprises:

[0037] A temperature sensor for the temperature within the second combustion chamber; and

[0038] A controller is electrically connected to the body and the temperature sensor, and is used to obtain the temperature in the second combustion chamber and the heat load required by the water heater; and is also used to control the driving mechanism of the gas distribution device to drive the valve to move and switch from the first position to the second position when the temperature in the second combustion chamber reaches a preset temperature, so that the gas distribution device can transport gas to the second combustion chamber for high-temperature air combustion to achieve the heat load range required by the water heater.

[0039] The present invention further provides a control method for a water heater, which is used for the water heater as described above, and is characterized in that the control method comprises:

[0040] Obtaining the temperature in the second combustion chamber and the heat load required by the water heater; and

[0041] When the temperature in the second combustion chamber reaches a preset temperature, the driving mechanism of the gas distribution device is controlled to drive the valve shaft to move and switch from the first position to the second position, so that the gas distribution device can transport gas to the second combustion chamber for high-temperature air combustion to achieve the required heat load range of the water heater.

[0042] The technical solution of the present invention adopts a valve that cooperates with a driving mechanism. When the driving mechanism drives the valve to move and switch between a first position and a second position, the valve closes or opens the air flow channel entering the gas distribution chamber, thereby adjusting the gas supply of the gas distribution device to avoid the problem of harmful gas generation due to the burner gas supply not meeting the heat load requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0044] Figure 1 It is a structural schematic diagram of an embodiment of a gas distribution device of the present invention;

[0045] Figure 2 for Figure 1 The main view;

[0046] Figure 3 for Figure 2 Middle AA section view;

[0047] Figure 4 for Figure 2 Middle BB section view;

[0048] Figure 5 It is a structural schematic diagram of an embodiment of the internal structure of the housing of the present invention;

[0049] Figure 6 for Figure 1 Exploded diagram of

[0050] Figure 7 It is a structural schematic diagram of an embodiment of a water heater of the present invention;

[0051] Figure 8 for Figure 7 Left view of .

[0052] Description of Figure Numbers:

[0053] Label name Label name 10 Body 11 Heat Exchanger 12 Heat exchange tube 13 Fume hood 20 shell 21 Preheat burner 22 Premixer 23 Air Inlet 24 Gas Inlet 25 Allocator 30 case 31 Gas distribution chamber 311 Intake cavity 312 Vent cavity 32 Partition 321 Board body 322 Ventilation holes 323 The first guide wall 324 The first guide surface 325 Second guide wall 326 Sink 33 Second guide surface 34 Give way slot 35 valve 36 Driving mechanism 37 nozzle 38 Isolation 39 Sealing ring

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] The present invention provides a gas distribution device, which is used to input gas or a mixture of gas and air. The gas distribution device has an air inlet and an air outlet. The gas enters the gas distribution device through the air inlet and is ejected from the air outlet into a burner, ignites in the burner, and burns in the burner to form high-temperature flue gas. The burner can be used for electrical equipment that realizes heat exchange by heating with high-temperature flue gas, such as a household water heater for bathing or heating. For the convenience of description, the following description takes the electrical equipment as a water heater as an example. Figures 1 to 8 The accompanying drawings correspond to the embodiments of the present invention.

[0059] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the gas distribution device includes: a shell 30, the shell 30 is formed with a gas distribution chamber 31 and an air inlet and an air outlet respectively connected to the gas distribution chamber 31; a valve 35, which is movably arranged on the shell 30 at a first position and a second position; and a driving mechanism 36, which is drivingly connected to the valve 35 and is used to drive the valve 35 to move and switch between the first position and the second position. When the valve 35 is in the first position, the valve 35 closes the air flow channel from the air inlet to the gas distribution chamber 31. When the valve 35 moves and switches from the first position to the second position, the valve 35 gradually opens the air flow channel from the air inlet to the gas distribution chamber 31.

[0060] A hollow chamber is formed inside the shell 30, and the chamber forms the gas distribution chamber 31. The air inlet and the air outlet are used for air intake and air outlet of the gas distribution chamber 31, respectively. The valve 35 is movably arranged on the shell 30. When the valve 35 is located at the first position, the valve 35 closes the air flow passage from the air inlet to the gas distribution chamber 31, and the air flow cannot enter the gas distribution chamber 31, and the gas distribution device cannot supply air. When the valve 35 is driven by the driving mechanism 36 and gradually moves to the second position, the valve 35 gradually reduces the blocking of the air flow passage entering the gas distribution chamber 31, the air flow passage entering the gas distribution chamber 31 gradually opens, and the air flow entering the gas distribution chamber 31 gradually increases. When the valve 35 is in the second position, the air intake of the gas distribution chamber 31 is at the maximum state.

[0061] The driving mechanism 36 is used to drive the valve 35 to move and switch between the first position and the second position, and can keep the valve 35 in a stable state at any position between the first position and the second position. The driving mechanism 36 can adopt an existing structure such as a motor, a solenoid valve, etc. that can drive the valve 35 to move back and forth in a directional manner. The valve can be a sheet-like structure. When the driving mechanism drives the valve to reach the first position, the valve blocks and closes the passage into the gas distribution chamber. The air inlet can also be a circular hole. The valve closes the hole where the air inlet is located to close the air flow passage from the air inlet to the gas distribution chamber.

[0062] After the airflow is ejected from the air outlet, ignition is performed in the burner so that the airflow output by the gas distribution device is ignited. There is a certain gap between the valve 35 and the air outlet to prevent the high temperature flame from affecting the valve 35. The gas distribution chamber 31 can be provided with a plurality of the air outlets, and the plurality of the air outlets are arranged at intervals so that the gas distribution device can achieve multi-point output.

[0063] In this embodiment, the gas distribution device has a first side surface and a second side surface facing each other, the gas outlet is arranged on the first side surface and the driving mechanism 36 is arranged on the second side surface, so that the flame generated by the gas ejected from the gas outlet is blocked by the shell 30 to achieve a heat insulation effect, thereby preventing the driving mechanism 36 from having a control failure due to continuous high temperature. When the airflow flows from the air inlet to the air outlet, the internal space of the gas distribution device can achieve a heat insulation effect. During the continuous output of the airflow, the airflow can bring the heat generated by the first side surface of the gas distribution device out to the gas outlet, so as to achieve a heat insulation and cooling effect on the second side surface, thereby preventing the heat from affecting the control of the driving mechanism 36.

[0064] The valve 35 is driven by the driving mechanism 36 to move relative to the shell 30, so that the gas flow rate entering the gas distribution chamber 31 from the air inlet is changed, and the gas input amount can be adjusted according to the specific needs of the burner to achieve the heat load control of the burner so that the heat load of the burner is adapted to the specific working conditions.

[0065] In one embodiment, the air inlet and the air outlet are arranged at an angle with each other, and a second guide surface 33 for guiding the airflow toward the air outlet is provided on the inner wall surface of the shell 30. The second guide surface 33 is used to guide the gas so that the airflow does not make a sharp turn when flowing in the gas distribution chamber 31, and avoids vortices caused by the turning of the airflow, so as to prevent the problem of increased wind resistance in the gas distribution chamber 31; by reducing the vortices generated in the gas distribution chamber, it can also play an effect of reducing the airflow noise in the gas distribution chamber. By setting the air outlet and the air inlet at an angle with each other, such as Figure 3 As shown, the air inlet and outlet directions of the gas distribution device can be adjusted according to the specific shape of the gas distribution device, so as to facilitate full use of the internal space of the burner when the gas distribution device is installed in the burner.

[0066] See also Figure 4 In one embodiment, a plurality of gas distribution chambers 31 are provided in the housing 30, and each gas distribution chamber 31 is provided with an air inlet and an air outlet connected thereto. Each gas distribution chamber 31 may be provided with one corresponding air outlet, or may be provided with multiple air outlets, so that each gas distribution chamber 31 can disperse the output gas.

[0067] A hollow chamber may be formed inside the housing 30, and a separator 38 is disposed inside the chamber, and the separator 38 divides the chamber into a plurality of gas distribution chambers 31. The plurality of gas distribution chambers 31 may be arranged sequentially along the length direction or the width direction of the gas distribution device, or may be arranged in accordance with a preset rule in the gas distribution device.

[0068] Each of the gas distribution chambers 31 has a valve 35 corresponding thereto, and each of the valves 35 has a driving mechanism 36 corresponding thereto. When the gas is output through the plurality of gas distribution chambers 31, the driving mechanism 36 of each of the gas distribution chambers 31 independently controls the effective gas flow rate of the corresponding gas distribution chamber 31, thereby making different positions of the gas distribution device present different gas output amounts, and different positions of the burner where the gas distribution device is located can also present different combustion states, thereby determining the instantaneous gas flow rate of each of the gas distribution chambers 31 according to the specific form of the burner, making full use of the internal space and internal air of the burner, and improving the combustion efficiency of the gas in the burner.

[0069] When each of the gas distribution chambers 31 is provided with a plurality of the gas outlets, different gas outlets are at different distances from the valve 35. In order to avoid uneven gas flow at each gas outlet of each gas distribution device, in the present embodiment, among the multiple gas outlets of each gas distribution chamber 31, the inner diameter of the gas outlet close to the valve 35 can be smaller than the inner diameter of the gas outlet far from the valve 35, so as to reduce the gas flow at the gas outlet close to the valve 35 and ensure that the gas flow at the multiple outlets is balanced.

[0070] Optionally, a nozzle 37 is provided on the gas outlet, and the number of the nozzles 37 is multiple, and the multiple nozzles 37 are arranged at intervals, and each nozzle 37 is connected to the gas distribution chamber 31, and the nozzle 37 is used to spray gas. By setting the nozzle 37, the direction of the sprayed gas of the gas distribution device can be adjusted by setting the nozzle 37. By adjusting the airflow direction of different nozzles 37, the airflows sprayed by different nozzles 37 can be mutually flame-stabilized, so as to improve the stability of gas combustion and prevent flame separation and flashback from occurring in the gas distribution device.

[0071] The nozzle 37 can spray gas in a direction away from the first side of the gas distribution device. When the gas is sprayed at high speed and burns to form a flame, the flame is away from the second side of the gas distribution device, and the influence of the high temperature flame on the driving mechanism 36 is further reduced.

[0072] Further optionally, the inner diameter of the nozzle 37 near the valve 35 is smaller than the inner diameter of the nozzle 37 far from the valve 35. The gas outlet of the gas distribution device can be designed in a standardized same size. Since the gas flow path is shorter when the gas flows from the valve 35 to the nozzle 37 near the valve 35, the gas flow rate of the nozzle 37 can be adjusted by adjusting the inner diameter of the nozzle 37, reducing the gas flow rate of the nozzle 37 near the valve 35 and increasing the gas flow rate of the nozzle 37 far from the valve 35, so that the gas flow rate of each nozzle 37 is balanced.

[0073] The valve 35 can be arranged at the air inlet of the gas distribution chamber 31, or can be arranged inside the gas distribution chamber 31. In one embodiment, the gas distribution device further includes a partition 32, which is arranged on the shell 30, and the partition 32 separates the gas distribution chamber 31 into an air inlet cavity 311 connected to the air inlet and an air outlet cavity 312 connected to the air outlet, and the air vents 322 are respectively connected to the air inlet cavity 311 and the air outlet cavity 312; the partition 32 is arranged in the gas distribution chamber 31, and is used to block the air flow from the air inlet to the air outlet. When the valve 35 is in the first position, the valve 35 closes the air vent 322, and when the valve 35 moves and switches from the first position to the second position, the valve 35 gradually opens the air flow channel formed by the air vent 322.

[0074] The vent hole 322 of the partition 32 forms an air flow channel connecting the air inlet cavity 311 and the air outlet cavity 312. When the valve 35 is in the first position, the valve 35 is attached to the partition 32 to close the vent hole 322, so that the air flow of the air inlet cavity 311 cannot enter the air outlet cavity 312. When the valve 35 moves to the second position, the vent hole 322 gradually opens, and the air flow through the vent hole 322 gradually increases. When the valve 35 is in the second position, the air flow of the vent hole 322 is at the maximum state.

[0075] The partition 32 can be arranged perpendicularly to the direction from the air inlet to the air outlet, or can extend obliquely from the air inlet direction to the air outlet direction, and separate the gas distribution chamber 31 into two chambers, the air inlet chamber 311 and the air outlet chamber 312 .

[0076] When manufacturing the gas distribution device, the valve 35 can be set on the side close to the air inlet, and the driving mechanism 36 can be set relatively far away from the air outlet to prevent the high temperature state of the flame formed by the gas ejected from the air outlet from affecting the driving mechanism 36 and the valve 35.

[0077] See also Figure 5Optionally, the partition 32 includes: a plate body 321, the air vent 322 is arranged on the plate body 321; and a first guide wall 323, the first guide wall 323 has a first side and a second side arranged opposite to each other, the first side of the first guide wall 323 is connected to the plate body 321, and the second side of the first guide wall 323 is connected to the inner wall surface of the shell 30, the plate body 321 and the first guide wall 323 separate the gas distribution chamber 31 into the air inlet cavity 311 and the air outlet cavity 312. The first side of the first guide wall 323 is arranged close to the air inlet, the plate body 321 is arranged obliquely from the air inlet to the air outlet, the second side of the first guide wall 323 is connected to one end of the plate body 321 close to the air inlet, and the other end of the plate body 321 is connected to the inner wall surface of the shell 30, so that the plate body 321 and the first guide wall 323 form a blocking structure in the gas distribution chamber 31, and the gas distribution chamber 31 is separated into an air inlet cavity 311 and an air outlet cavity 312. The valve 35 is arranged on the side of the plate body 321 facing away from the air outlet, so that the inner space of the air outlet cavity 312 can play a role of heat insulation.

[0078] See also Figure 6 When manufacturing the gas distribution device, optionally, a clearance groove 34 is provided on the housing 30. When the valve 35 is switched to the second position, the valve 35 is embedded in the clearance groove. The clearance groove is used to accommodate the valve 35, so that the valve 35 does not block the airflow from the air inlet to the gas distribution chamber 31. When the partition plate 32 is provided, the clearance groove can be arranged relative to the plate body 321, so that the driving mechanism 36 drives the valve 35 to move in a direction close to or away from the plate body 321. When the valve 35 is embedded in the clearance groove, the valve 35 does not block the airflow from the air inlet to the air inlet cavity 311, and the airflow flows along the plate body 321 to the vent 322, thereby reducing wind resistance.

[0079] A sealing ring 39 may be provided on the housing 30 . When the valve 35 is in the second position, the sealing ring 39 seals the edge of the valve 35 to prevent air leakage from occurring in the gap between the clearance groove and the edge of the valve 35 .

[0080] Optionally, a sink groove 326 is provided on the housing 30. When the valve 35 is switched to the first position, the edge of the valve 35 is embedded in the sink groove 326. The sink groove 326 can be used to seal the edge of the valve 35 to prevent air leakage from occurring at the edge of the valve 35 when the valve 35 is in the first position. A sealing ring 39 matching the valve 35 can also be provided at the edge of the sink groove 326. When the partition 32 is provided, the sink groove 326 can be provided on the plate body 321 and match the shape of the edge of the valve 35 to seal the edge of the valve 35.

[0081] See also Figure 5 Optionally, one end of the first guide wall 323 away from the plate body 321 extends toward the air inlet, so that a first guide surface 324 for guiding the airflow toward the vent is formed on the first guide wall 323. The first guide surface 324 is used to reduce the wind resistance at the air inlet position, so that the airflow can flow toward the vent along the space formed by the first guide surface 324 and the inner wall of the shell 30. The first guide surface 324 is an inclined slope, so that the airflow entering the air inlet cavity 311 from the air inlet can gather toward the vent and flow toward the air outlet cavity 312.

[0082] Optionally, the partition 32 also includes: a second guide wall 325, the second guide wall 325 has a third side and a fourth side arranged opposite to each other, the third side of the second guide wall 325 is connected to an end of the plate body 321 away from the first guide wall 323, and the fourth side of the second guide wall 325 extends away from the air inlet and is connected to the inner wall surface of the shell 30; the first guide wall 323, the plate body 321 and the second guide wall 325 separate the gas distribution chamber 31 into the air inlet cavity 311 and the air outlet cavity 312, and the air flow channel area of ​​the air outlet cavity 312 gradually increases from the third side to the fourth side of the second guide wall 325.

[0083] The first guide wall 323, the plate body 321 and the second guide wall 325 are connected in sequence to form the partition 32. The first side edge of the first guide wall 323 and the fourth side edge of the second guide wall 325 are respectively connected to two opposite inner wall surfaces of the shell 30, so that the partition 32 forms a barrier in the gas distribution chamber 31.

[0084] The plate body 321 can be arranged parallel to the wall surface where the fourth side edge of the second flow guide wall 325 is located, and the valve 35 can be moved and switched between the first position and the second position in a direction perpendicular to the plate body 321. The air outlet can be arranged on a side wall surface where the first side edge of the first flow guide wall 323 is located, and the valve 35 is located on a side of the plate body 321 facing away from the air outlet, so that the gap between the plate body 321 and the inner wall surface of the housing 30 can play a heat insulation effect.

[0085] The fourth side of the second guide wall 325 extends in the direction of the wall away from the first side of the first guide wall 323, so that the airflow channel area of ​​the air outlet cavity 312 gradually increases from the third side to the fourth side of the second guide wall 325. As the airflow channel area increases, the airflow gradually flows toward the air outlet cavity 312 in a gradually expanding manner, which can achieve the effect of mixed airflow and make the gas and air in the airflow more fully mixed. When the airflow flows toward the air outlet cavity 312 along the gradually expanding surface formed by the second guide wall 325, it can avoid the airflow from generating vortex at the air outlet position, thereby reducing the wind resistance of the airflow at the air outlet position. When the air outlet cavity 312 is provided with the second guide surface 33, the second guide surface 33 can further guide the airflow entering the air outlet cavity 312 along the second guide wall 325 toward the air outlet, thereby further reducing the wind resistance at the air outlet position.

[0086] The present invention also provides an embodiment of a burner.

[0087] See also Figure 7 and Figure 8 The burner includes: a shell 20, in which a first combustion chamber and a second combustion chamber that are interconnected are formed; a preheating burner 21, which is arranged in the shell 20 and is used to burn to form a mixed gas to heat the air in the first combustion chamber to a preset temperature and transport it to the second combustion chamber; a gas distribution device as described in any of the above embodiments, which is arranged in the shell 20 and is used to inject gas into the second combustion chamber to perform a high-temperature air combustion reaction in the second combustion chamber.

[0088] The preheating burner 21 is used to burn to form a high-temperature mixed gas, which is mixed with the air in the first combustion chamber so that the air in the first combustion chamber is heated to a preset temperature and transported to the second combustion chamber. When it is detected that the gas transported from the first combustion chamber to the second combustion chamber reaches the preset temperature, the gas distribution device sprays gas into the second combustion chamber, and the gas undergoes high-temperature air combustion in the second combustion chamber to form high-temperature flue gas.

[0089] A high-temperature air combustion reaction is carried out in the second combustion chamber. During the high-temperature air combustion reaction, the chemical reaction needs to occur in a high-temperature, low-oxygen environment, the reactant temperature is higher than its auto-ignition temperature, and the maximum temperature rise during the combustion process is lower than its auto-ignition temperature, and the oxygen volume fraction is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the flame thickness becomes thicker, and the flame front disappears, so that the temperature in the entire second combustion chamber is very uniform, the peak combustion temperature is low and the noise is extremely low, and the pollutant nitrogen oxides and carbon monoxide emissions are greatly reduced. However, achieving high-temperature air combustion requires certain conditions: it is necessary to ensure that the oxygen concentration in most areas of the furnace is lower than a certain value, generally lower than 5% to 10%, to ensure that the gas is fully decomposed and burned evenly, and the temperature is higher than the auto-ignition point of the fuel to maintain auto-ignition. The preset temperature of the mixed flue gas reaches the auto-ignition temperature of the gas injected by the gas distribution device, so that the gas injected by the gas distribution device can maintain auto-ignition in the second combustion chamber.

[0090] Since the air in the first combustion chamber can supplement the combustion of the gas injected by the preheating burner 21, the oxygen concentration in the mixed smoke is relatively low, which is suitable for high-temperature air combustion reaction in the second combustion chamber. When the gas injected by the gas distribution device is subjected to high-temperature air combustion, the energy consumption required for combustion is reduced. A fan can be arranged outside the burner to supplement air into the first combustion chamber, and other structures can also be arranged outside the burner to input air into the first combustion chamber.

[0091] The preheating burner 21 in the first combustion chamber quickly preheats the air in the first combustion chamber, so that the heat load ratio in the first combustion chamber is adjusted within the above-mentioned range of 20%-50%, so that the emission of nitrogen oxides and carbon monoxide in the mixed flue gas formed in the first combustion chamber is controlled at about 10ppm. Since high-temperature air combustion is a volumetric combustion or diffuse combustion, its reaction rate is low, local heat release is small, heat flux distribution is uniform, combustion peak temperature is low and noise is extremely low.

[0092] Compared with the traditional small-area local high-temperature combustion, the high-temperature air combustion of the 16L gas water heater equipped with the burner described in this embodiment reacts in a large area or even the entire second combustion chamber, and the flame front disappears in the second combustion chamber; the generation of pollutants such as nitrogen oxides and carbon monoxide is significantly reduced; the overall temperature of the second combustion chamber is increased, and the radiation heat transfer is enhanced. The combustion in the second combustion chamber forms high-temperature flue gas, and the heat load of the combustion in the second combustion chamber accounts for 50%-80%. By controlling the heat load ratio of the second combustion chamber within the above range, a gentle combustion is achieved in the second combustion chamber, and the purpose of low-noise combustion is achieved, thereby reducing the combustion noise of the gas water heater. Since the high-temperature flue gas generated by the high-temperature air combustion is rich in nitrogen and carbon dioxide, the environmental pollution caused is also relatively reduced.

[0093] By controlling the amount of gas input to the second combustion chamber through the gas distribution device, the heat load ratio generated by the high-temperature air combustion in the second combustion chamber can be maintained within a preset range, thereby maintaining a preset combustion state in the second combustion chamber and reducing the emission of harmful gases.

[0094] Optionally, the burner further comprises: a premixer 22, which is arranged in the housing 20 and is used to receive the gas and air for premixing to form a mixed gas and deliver it to the preheating burner 21 and the gas distribution device. The premixer 22 has an air inlet 23 and a gas inlet 24, which are respectively used to introduce air and gas, mix to form a mixed gas and deliver it to the preheating burner 21 and the gas distribution device. Premixing the gas through the premixer 22 can improve the uniformity of the gas and help improve the combustion efficiency of the gas.

[0095] Further optionally, the burner further comprises: a distributor 25, which is provided in the housing 20 and connected to the premixer 22, and is used to deliver the mixed gas formed by the premixer 22 to the preheating burner 21 and the gas distribution device respectively. The distributor 25 has an air inlet end connected to the premixer 22 and an air outlet end respectively connected to the preheating burner 21 and the gas distribution device, so as to realize the predistribution of the gas.

[0096] The present invention also provides an embodiment of a water heater.

[0097] See also Figure 7 and Figure 8 The water heater comprises: a body 10; a burner as described in any of the above embodiments, which is arranged in the body 10; and a heat exchanger 11, which is arranged in the body 10 and connected to the second combustion chamber, and is used for heat exchange with the flue gas generated by the high-temperature air combustion reaction of the burner.

[0098] The heat exchanger 11 has a preset heat load range according to the required working conditions. The high-temperature air of the burner burns to generate high-temperature flue gas, which exchanges heat with the heat exchange tube 12 of the heat exchanger 11 to produce hot water. The water heater may also include a smoke hood 13 and a smoke exhaust pipe. The cooling smoke generated by heat exchange of the heat exchanger 11 is discharged to the smoke exhaust pipe through the smoke hood 13 to discharge the smoke to a preset direction and a preset position.

[0099] Optionally, the water heater further includes: a temperature sensor for the temperature in the second combustion chamber; and a controller electrically connected to the body 10 and the temperature sensor, for obtaining the temperature in the second combustion chamber and the heat load required by the water heater; and also for controlling the driving mechanism 36 of the gas distribution device to drive the valve 35 to move and switch from the first position to the second position when the temperature in the second combustion chamber reaches a preset temperature, so that the gas distribution device delivers gas to the second combustion chamber for high-temperature air combustion to reach the heat load range required by the water heater. When the valve 35 of the gas distribution device moves and switches between the first position and the second position, the amount of gas input to the burner changes, and the heat load also changes relatively. The movement of the valve 35 is controlled by the controller, so that the water heater can meet the heat load range of the water heater under the current working condition, and reduce harmful gases such as nitrogen oxides and carbon monoxide generated by the water heater. The controller can use existing software to drive and control the driving mechanism 36.

[0100] The present invention also provides a water heater control method, which is used for the water heater as described in any of the above embodiments.

[0101] The control method comprises:

[0102] S100: Acquire the temperature in the second combustion chamber and the heat load required by the water heater.

[0103] S200: When the temperature in the second combustion chamber reaches a preset temperature, the driving mechanism 36 of the gas distribution device is controlled to drive the valve 35 to move and switch from the first position to the second position, so that the gas distribution device delivers gas to the second combustion chamber for high-temperature air combustion to achieve the required heat load range of the water heater.

[0104] The heat load of the water heater is adapted to the current working condition, and the amount of gas input by the gas distribution device of the burner will affect the heat load of the water heater. When the valve 35 is driven to move by the drive mechanism 36, when the drive mechanism 36 drives the valve 35 to reach a preset position, the heat load generated by the burner is relatively determined and adapted to the required heat load of the water heater, thereby avoiding the problem of increased harmful gases caused by incomplete combustion of gas.

Claims

1. A gas distribution device for a burner, characterized in that: The gas distribution device comprises: A housing, wherein the housing is formed with a gas distribution chamber and a gas inlet and a gas outlet respectively connected to the gas distribution chamber; a valve movably disposed on the housing between a first position and a second position; and A driving mechanism, drivingly connected to the valve, for driving the valve to move and switch between the first position and the second position; The partition is arranged on the shell, and the partition includes a plate body and a first guide wall, the first guide wall has a first side and a second side arranged opposite to each other, the first side of the first guide wall is connected to the plate body, and the second side of the first guide wall is connected to the inner wall surface of the shell, the plate body and the first guide wall separate the gas distribution chamber into an air inlet cavity connected to the air inlet and an air outlet cavity connected to the air outlet; the plate body is provided with an air vent, and the air vent forms an air flow channel connecting the air inlet cavity and the air outlet cavity; the first guide wall extends toward the air inlet at one end away from the plate body, so that a first guide surface for guiding the air flow toward the air vent is formed on the first guide wall; when the valve is in the first position, the valve closes the air flow channel formed by the air vent, and when the valve moves and switches from the first position to the second position, the valve gradually opens the air flow channel formed by the air vent.

2. The gas distribution device according to claim 1, characterized in that: The partition also includes: a second guide wall, wherein the second guide wall has a third side and a fourth side that are arranged opposite to each other, the third side of the second guide wall is connected to an end of the plate body away from the first guide wall, and the fourth side of the second guide wall extends away from the air inlet and is connected to the inner wall surface of the shell; The first guide wall, the plate body and the second guide wall separate the gas distribution chamber into the air inlet cavity and the air outlet cavity. From the third side edge to the fourth side edge of the second guide wall, the air flow channel area of ​​the air outlet cavity gradually increases.

3. The gas distribution device according to claim 1, characterized in that: The housing is provided with a clearance groove, and when the valve is switched to the second position, the valve is embedded in the clearance groove; And / or, a sink groove is provided on the shell, and when the valve is switched to the first position, an edge of the valve is embedded in the sink groove.

4. The gas distribution device according to claim 1, characterized in that: A plurality of gas distribution chambers are arranged in the shell, and each of the gas distribution chambers is respectively provided with an air inlet and an air outlet connected thereto.

5. The gas distribution device according to any one of claims 1 to 4, characterized in that: The air outlet is provided with a nozzle, the number of the nozzles is multiple, and the multiple nozzles are arranged at intervals.

6. The gas distribution device according to claim 5, characterized in that The inner diameter of the nozzle close to the valve is smaller than the inner diameter of the nozzle far from the valve.

7. The gas distribution device according to any one of claims 1 to 4, characterized in that: The air inlet and the air outlet are arranged at an angle with each other in their air flow directions, and a second guide surface for guiding the air flow toward the air outlet is provided on the inner wall surface of the shell.

8. A burner, characterized in that: include: A housing, wherein a first combustion chamber and a second combustion chamber that are interconnected are formed in the housing; a preheating burner, disposed in the housing, for burning to form a mixed gas, so as to heat the air in the first combustion chamber to a preset temperature, and transport the air to the second combustion chamber; as well as The gas distribution device according to any one of claims 1 to 7 is arranged in the housing and is used to inject gas into the second combustion chamber so that a high-temperature air combustion reaction occurs in the second combustion chamber.

9. The burner according to claim 8, characterized in that The burner also includes: The premixer is arranged on the shell and is used for receiving the fuel gas and air for premixing to form a mixed gas and then conveying the mixed gas to the preheating burner and the gas distribution device.

10. The burner according to claim 9, characterized in that The burner also includes: A distributor is arranged on the shell and connected to the premixer, and is used for conveying the mixed gas formed by the premixer to the preheating burner and the gas distribution device respectively.

11. A water heater, characterized in that: include: Body; The burner according to any one of claims 8 to 10, provided in the machine body; and The heat exchanger is arranged on the machine body and connected to the second combustion chamber, and is used for exchanging heat with the flue gas generated by the high-temperature air combustion reaction of the burner.

12. The water heater according to claim 11, characterized in that The water heater also includes: A temperature sensor for the temperature within the second combustion chamber; and A controller is electrically connected to the body and the temperature sensor, and is used to obtain the temperature in the second combustion chamber and the heat load required by the water heater; and is also used to control the driving mechanism of the gas distribution device to drive the valve to move and switch from the first position to the second position when the temperature in the second combustion chamber reaches a preset temperature, so that the gas distribution device can transport gas to the second combustion chamber for high-temperature air combustion to achieve the heat load range required by the water heater.

13. A method for controlling a water heater, used for the water heater according to claim 11 or 12, characterized in that: The control method comprises: Obtaining the temperature in the second combustion chamber and the heat load required by the water heater; and When the temperature in the second combustion chamber reaches a preset temperature, the driving mechanism of the gas distribution device is controlled to drive the valve to move and switch from the first position to the second position, so that the gas distribution device can transport gas to the second combustion chamber for high-temperature air combustion to achieve the required heat load range of the water heater.

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