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

Abstract

The application discloses a gas distribution device, a burner, a water heater and a control method of the water heater, wherein the gas distribution device comprises a shell, a gas distribution chamber, an air inlet and an air outlet, a baffle, a driving mechanism and the like.

Description

Technical Field

[0001] This invention relates to the field of water heaters, and particularly to a gas distribution device, a burner, a water heater, and a control method for a water heater. Background Technology

[0002] In a gas water heater, gas enters the burner through a gas valve, where it is burned to form high-temperature flue gas. This flue gas exchanges heat with the heat exchange tubes of the water heater to form hot water, which is then output. The gas valve is usually in a normally open state, meaning the gas input exceeds the actual heat load required by the water heater. Since the gas input cannot be easily adjusted in a timely manner, the flue gas produced during heat exchange contains harmful gases such as nitrogen oxides and carbon monoxide due to incomplete combustion. Summary of the Invention

[0003] The main objective of this 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 of inconvenient control of gas flow in existing burners.

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

[0005] A housing having a gas distribution chamber and an inlet and an outlet respectively connected to the gas distribution chamber;

[0006] A baffle, slidably disposed on the housing between a first position and a second position, the baffle having a flow hole; and

[0007] A driving mechanism, connected to the baffle, is used to drive the baffle to slide between the first position and the second position. When the baffle is in the first position, the baffle closes the airflow channel from the air inlet to the gas distribution chamber. When the baffle slides from the first position to the second position, the flow hole connects to the airflow channel from the air inlet to the gas distribution chamber, and the effective flow rate of the airflow channel gradually increases.

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

[0009] A partition is provided on the housing, the partition dividing the gas distribution chamber into an air inlet chamber that communicates with the air inlet and an air outlet chamber that communicates with the air outlet, and the partition is provided with a vent hole that communicates with the air inlet chamber and the air outlet chamber;

[0010] When the baffle is in the first position, the baffle closes the vent hole. When the baffle slides from the first position to the second position, the baffle gradually opens the airflow channel formed by the vent hole.

[0011] Optionally, the air outlet is provided with a nozzle, and the number of nozzles is multiple, with the multiple nozzles spaced apart.

[0012] Optionally, there are multiple flow holes, which are spaced apart and correspond one-to-one with multiple nozzles.

[0013] Optionally, the gas distribution device further includes a sealing ring, which is used to seal the gap between the baffle and the housing;

[0014] The housing has a sealing groove on the side facing the baffle, and the sealing groove is provided with the sealing ring; or, the baffle has a sealing groove on the side facing the housing, and the sealing groove is provided with the sealing ring.

[0015] Optionally, the inner wall of the housing is provided with a limiting groove, and the baffle is embedded in the limiting groove. The limiting groove is used to limit the sliding switching of the baffle between the first position and the second position.

[0016] Optionally, the volume of the air outlet chamber is larger than the volume of the air inlet chamber.

[0017] Optionally, the airflow direction of the air outlet is set at an angle to the airflow direction of the air inlet.

[0018] Optionally, a guide surface is formed on the inner wall of the gas distribution chamber, which is used to guide the airflow toward the gas outlet.

[0019] Optionally, the baffle is provided with teeth, and the driving mechanism includes a motor module and a gear connected to the motor module, wherein the gear is meshed with the teeth on the baffle.

[0020] Optionally, the housing is provided with a gear cavity for accommodating the gear.

[0021] The present invention also discloses a burner, comprising:

[0022] The outer casing contains a first combustion chamber and a second combustion chamber that are interconnected.

[0023] A preheating burner, located in the outer casing, is used to burn a mixture of gases to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber;

[0024] The gas distribution device described above is located in the outer casing and is used to inject gas into the second combustion chamber so that a high-temperature air combustion reaction can occur in the second combustion chamber.

[0025] Optionally, the burner further includes:

[0026] A premixer, located in the housing, is used to premix fuel gas and air to form a mixed gas, which is then delivered to the preheating burner and the gas distribution device.

[0027] Optionally, the burner further includes:

[0028] A distributor, located in the housing and connected to the premixer, is used to deliver the mixed gas formed by the premixer to the preheating burner and the gas distribution device, respectively.

[0029] The present invention also proposes a water heater, comprising:

[0030] Organism;

[0031] The burner as described above is disposed in the body; and

[0032] A heat exchanger is located in the machine body and connected to the second combustion chamber of the burner, for exchanging heat with the flue gas generated by the high-temperature air combustion reaction of the burner.

[0033] Optionally, the water heater further includes:

[0034] Temperature sensor for the temperature inside the second combustion chamber of the burner; and

[0035] The controller, electrically connected to the body and the temperature sensor, is used to acquire the temperature in the second combustion chamber of the burner and the required heat load of the water heater; and is also used to control the drive mechanism of the gas distribution device of the burner to drive the baffle to slide 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 of the burner supplies gas to the second combustion chamber of the burner for high-temperature air combustion to reach the required heat load range of the water heater.

[0036] The present invention also proposes a control method for a water heater, used in the water heater described above, characterized in that the control method includes:

[0037] Obtain the temperature inside the second combustion chamber and the required heat load of the water heater; and

[0038] When the temperature in the second combustion chamber reaches the preset temperature, the drive mechanism of the gas distribution device drives the baffle to slide 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, thereby achieving the required heat load range of the water heater.

[0039] The technical solution of this invention uses a baffle on the housing to move between a first position and a second position, so that the position of the flow hole on the baffle changes relative to each other. As the position of the flow hole changes, the gas flow rate entering the gas distribution chamber through the air inlet changes synchronously, thereby adjusting the gas input of the burner and controlling the gas input, thus reducing the generation of harmful gases. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of an embodiment of the gas distribution device of the present invention;

[0042] Figure 2 This is a schematic diagram of an embodiment of the internal structure of the gas distribution device when the baffle is in the first position.

[0043] Figure 3 A schematic diagram of an embodiment of the internal structure of the gas distribution chamber when the baffle is in the first position;

[0044] Figure 4 This is a schematic diagram of an embodiment of the internal structure of the gas distribution device when the baffle is in the second position.

[0045] Figure 5 This is a schematic diagram of an embodiment of the internal structure of the gas distribution chamber when the baffle is in the second position.

[0046] Figure 6 This is a schematic diagram of the structure of one embodiment of the baffle of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of one embodiment of the housing of the present invention;

[0048] Figure 8 for Figure 7 Sectional view along the middle AA direction;

[0049] Figure 9 for Figure 7 Sectional view along the BB direction;

[0050] Figure 10 This is a schematic diagram of the structure of an embodiment of the water heater of the present invention;

[0051] Figure 11 for Figure 10 The left view.

[0052] Explanation of icon numbers:

[0053]

[0054]

[0055] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not 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 creative effort are within the scope of protection of the present invention.

[0057] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0058] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0059] This invention proposes a gas distribution device for a burner. The gas distribution device injects fuel gas or a mixture of fuel gas and air into the burner to generate high-temperature flue gas. The gas distribution device can be used in burners of electrical appliances with heating functions, such as household bath water heaters or heating water heaters. The gas injected by the gas distribution device burns within the burner to form high-temperature flue gas, which exchanges heat with the heat exchange tubes of the water heater to generate hot water. The following description uses a water heater as an example of the electrical appliance. Figures 1 to 11 The accompanying drawings correspond to embodiments of the present invention.

[0060] Please see Figures 1 to 5In one embodiment, the gas distribution device includes: a housing 30, the housing 30 having a gas distribution chamber 31 and an inlet and an outlet respectively communicating with the gas distribution chamber 31; the gas distribution chamber 31 is a hollow cavity inside the housing 30, used to form a channel for gas flow; the inlet serves as the inlet end of the housing 30, and the outlet serves as the outlet end of the housing 30. The shape of the housing 30 is adapted to the shape of the burner so that the gas output from the outlet of the housing 30 is sprayed into the burner for combustion.

[0061] A baffle 36 is slidably disposed on the housing 30 between a first position and a second position, and the baffle 36 is provided with a flow-through hole 361. The baffle 36 is used to block the airflow entering the gas distribution chamber 31. When the baffle 36 is in the first position, the baffle 36 completely blocks the airflow entering the gas distribution chamber 31, so that the gas distribution device is in a closed state. When the baffle 36 is slidably switched to the second position, the flow-through hole 361 on the baffle 36 connects to the airflow channel from the air inlet into the gas distribution chamber 31, and the gas distribution device is in a maximum flow state.

[0062] The drive mechanism 38 is driven to connect with the baffle 36 and is used to drive the baffle 36 to slide between the first position and the second position. When the baffle 36 is in the first position, the baffle 36 closes the airflow channel from the air inlet to the gas distribution chamber 31. When the baffle 36 slides from the first position to the second position, the flow hole 361 connects to the airflow channel from the air inlet to the gas distribution chamber 31, and the effective flow rate of the airflow channel gradually increases.

[0063] Please see Figure 6 When the baffle 36 is in the first position, the gas distribution device is in a closed state. When the baffle 36 slides between the first position and the second position, the instantaneous flow rate of the flow passage 361 of the baffle 36 changes, causing the output gas flow rate of the gas distribution device to change accordingly, thereby realizing the adjustment of the output gas flow rate of the gas distribution device.

[0064] The drive mechanism 38 is used to drive the baffle 36 to slide relative to the housing 30, so that the baffle 36 can slide in a preset direction between the first position and the second position. The drive mechanism 38 can be a combination of a motor module 381 and a reducer 382 to achieve the directional reciprocating motion of the baffle 36. The controller of the drive mechanism 38 can be integrated with the controller of the burner. The gas load generated by the burner can be converted into the stroke of the drive mechanism 38 through an existing program. By controlling the stroke of the drive mechanism 38, the position of the baffle 36 can be controlled, so that the baffle 36 moves relative to the first position and the second position, adjusting the effective flow rate of the flow orifice 361, and realizing the instantaneous adjustment of the gas flow rate output by the gas distribution device. Optionally in this embodiment, the baffle 36 is provided with teeth to form a rack-like structure. The drive mechanism 38 includes a motor module 381 and a gear 383 connected to the motor module 381. The gear 383 is meshed with the teeth on the baffle 36. The motor module can also be equipped with a reducer 382 to cooperate with it. By using gears 383 to mesh, the baffle 36 can be directionally and quantitatively displaced, thereby achieving precise control of the airflow of the gas distribution device. Further optionally, the housing 30 is provided with a gear cavity 383 37 for accommodating the gear 383. The gear 383 is confined within the gear cavity 383 37. When the burner is running, the high temperature generated by combustion will affect the gear 383. The gear cavity 383 37 can protect the gear 383, preventing damage or deformation of the gear 383 that could lead to inaccurate control of the baffle 36's movement stroke.

[0065] When the gas distribution chamber 31 is used to transport a mixture of gas and air, the gas distribution chamber 31 can be used to mix the gas and air, so that the gas and air can be fully mixed and then injected into the burner for combustion, thereby improving the combustion efficiency of the gas.

[0066] Please see Figure 5To save space, the airflow direction of the outlet is set at an angle to the airflow direction of the inlet, so that the airflow output by the gas distribution device can be directed in a preset direction, thereby saving space in the burner. Optionally, the housing 30 has a first side and a second side facing away from each other. The outlet is located on the first side of the housing 30, and the drive mechanism 38 is located on the second side of the housing 30. When the gas ejected from the outlet burns to form a flame, the housing 30 can provide heat insulation, and the gas distribution chamber 31 can provide gas heat insulation. Since the gas in the gas distribution chamber 31 is in a flowing state, the gas distribution chamber 31 can reduce the heat transfer from the first side to the second side of the housing 30, thereby keeping the second side where the drive mechanism 38 is located at a relatively low temperature, avoiding the influence of high temperature on the drive mechanism 38, and thus helping to keep the drive mechanism 38 in a preset state.

[0067] Please see Figure 7 and Figure 8 In order to reduce the wind resistance in the gas distribution chamber 31, optionally, a guide surface 35 is formed on the inner wall surface of the gas distribution chamber 31. The guide surface 35 is used to guide the airflow towards the outlet to prevent the gas from turning sharply when flowing towards the outlet in the gas distribution chamber 31, which would cause vortices. This would avoid wind resistance caused by vortices, reduce airflow noise, and help improve the stability of airflow output.

[0068] Please see Figure 8 and Figure 9 In one embodiment, the gas distribution device further includes a sealing ring 33, which is used to seal the gap between the baffle 36 and the housing 30; when the baffle 36 switches between the first position and the second position, the sealing ring 33 is used to prevent gas leakage caused by the gap between the baffle 36 and the housing 30.

[0069] The sealing ring 33 can be disposed on the baffle 36 or on the housing 30. Optionally, the housing 30 has a sealing ring groove 322 on the side facing the baffle 36, and the sealing ring 33 is disposed in the sealing ring groove 322; or, the baffle 36 has a sealing ring groove 322 on the side facing the housing 30, and the sealing ring 33 is disposed in the sealing ring groove 322. When the baffle 36 is in the first position, the sealing ring 33 completely abuts against the baffle 36 and the housing 30, so that the gap between the baffle 36 and the housing 30 is sealed. When the baffle 36 is in the second position, the sealing ring 33 is disposed corresponding to the flow hole 361 and the housing 30, so as to seal the edge of the flow hole 361, so as to prevent airflow from leaking from the flow hole 361 to the outside of the housing 30. The sealing ring groove 322 is used to engage the sealing ring 33 to limit the sealing ring 33.

[0070] Please see Figure 5 and Figure 8 To limit the movement trajectory of the baffle 36, optionally, the inner wall surface of the housing 30 is provided with a limiting groove 34, and the baffle 36 is fitted into the limiting groove 34. The limiting groove 34 is used to limit the sliding switching of the baffle 36 between the first position and the second position. The edge of the baffle 36 can be fitted into the limiting groove 34. When the baffle 36 moves directionally under the drive of the driving mechanism 38, the limiting groove 34 is used to limit the movement trajectory of the baffle 36, so that the baffle 36 can only move along the preset trajectory, thereby improving the controllability of the baffle 36 and helping to improve the sealing performance between the baffle 36 and the housing 30.

[0071] Please see Figure 1 and Figure 2 In one embodiment, the air outlet is provided with a nozzle 40, and the number of nozzles 40 is multiple, with the multiple nozzles 40 arranged at intervals. The nozzles 40 are connected to the gas distribution chamber 31 through the air outlet, serving as the air outlet port of the gas distribution device. By setting the nozzles 40, the nozzles 40 can be oriented in a preset direction, causing the gas distribution device to spray gas in the preset direction.

[0072] Optionally, the number of flow-through holes 361 is multiple, and the multiple flow-through holes 361 are arranged at intervals, with each of the multiple flow-through holes 361 corresponding to a multiple of the nozzles 40. By setting multiple nozzles 40, the gas can be dispersed for output, thereby improving the uniformity of combustion of the gas injected by the gas distribution device. In this embodiment, the gas flow rate of the nozzle 40 can be adjusted by adjusting the inner diameter of the nozzle 40, thereby allowing the gas output at different positions of the gas distribution device to vary, provided that the housing 30 is standardized, thus improving the controllability of the gas distribution device.

[0073] Please see Figures 2 to 5 In one embodiment, the gas distribution device further includes: a partition 32 disposed on the housing 30, the partition 32 dividing the gas distribution chamber 31 into an inlet chamber 311 communicating with the inlet and an outlet chamber 312 communicating with the outlet, the partition 32 having a vent 321 communicating with the inlet chamber 311 and the outlet chamber 312; when the baffle 36 is in the first position, the baffle 36 closes the vent 321; when the baffle 36 slides from the first position to the second position, the baffle 36 gradually opens the airflow channel formed by the vent 321. The partition 32 is disposed within the gas distribution chamber 31 to divide the internal space of the gas distribution chamber 31, forming the inlet chamber 311 and the outlet chamber 312. The baffle 36 is slidably disposed on the partition 32 for sliding relative to the partition 32 to slide between the first position and the second position.

[0074] The baffle 36 can be fitted to the partition 32. When the sealing ring 33 is provided, the sealing ring 33 can be arranged around the circumference of the vent 321. The airflow direction of the vent 321 can be the same as the airflow direction of the air inlet to reduce the wind resistance from the baffle 36 to the air outlet 312.

[0075] When the baffle 36 is in the first position, the flow-through hole 361 of the baffle 36 is completely offset from the vent hole 321 of the partition 32, and the vent hole 321 is in a closed state, at which time the airflow cannot enter the air outlet chamber 312. When the baffle 36 slides to the second position, the overlapping area of ​​the flow-through hole 361 of the baffle 36 and the vent hole 321 of the partition 32 gradually increases, and the airflow of the vent hole 321 gradually increases until the flow-through hole 361 and the vent hole 321 are completely overlapped, at which point the airflow of the vent hole 321 is at its maximum, and the baffle 36 is in the second position.

[0076] The baffle 36 is located within the gas distribution chamber 31 so that it can better cooperate with the housing 30. When the housing 30 is provided with the limiting groove 34, the limiting groove 34 is located on the inner wall surface of the air inlet chamber 311 or the air outlet chamber 312.

[0077] Optionally, the baffle 36 is disposed in the air inlet chamber 311 so that the baffle 36 is located away from the air outlet. Since the gas is injected and burned at the air outlet of the gas distribution device, the temperature near the air outlet is relatively high. The drive mechanism 38 can be disposed on the side of the baffle 36 away from the air outlet to avoid the high temperature affecting the drive mechanism 38.

[0078] Optionally, the volume of the exhaust chamber 312 is larger than the volume of the intake chamber 311. When the airflow enters the exhaust chamber 312, the exhaust chamber 312 can provide a larger space so that the mixture of gas and air can be mixed evenly in the exhaust chamber 312, thereby improving the combustion efficiency of the gas.

[0079] The present invention also proposes an embodiment of a burner.

[0080] Please see Figure 10 and Figure 11 The burner includes: a housing 20, in which a first combustion chamber and a second combustion chamber are formed in communication with each other; a preheating burner 21, disposed in the housing 20, for burning to form a mixed gas to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber; and a gas distribution device as described in any of the above embodiments, disposed in the housing 20, for injecting gas into the second combustion chamber to enable a high-temperature air combustion reaction to occur in the second combustion chamber.

[0081] The preheating burner 21 is used to burn a high-temperature mixed gas. The high-temperature mixed gas is mixed with the air in the first combustion chamber to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber. When the gas delivered from the first combustion chamber to the second combustion chamber is detected to have reached the preset temperature, the gas distribution device injects gas into the second combustion chamber. The gas is then burned in the second combustion chamber at high temperature to form high-temperature flue gas.

[0082] High-temperature air combustion occurs within the second combustion chamber. During this reaction, the chemical reaction must occur in a high-temperature, low-oxygen environment. The reactant temperature is above its auto-ignition temperature, and the maximum temperature rise during combustion is below its auto-ignition temperature. The oxygen volume fraction is diluted to an extremely low concentration by the combustion products. Compared to conventional combustion, under this combustion state, fuel pyrolysis is suppressed, the flame thickness increases, and the flame front disappears, resulting in a highly uniform temperature throughout the second combustion chamber, a low peak combustion temperature, minimal noise, and a significant reduction in nitrogen oxide and carbon monoxide emissions. However, achieving high-temperature air combustion requires certain conditions: the oxygen concentration in most areas of the furnace must be below a certain value, generally below 5%–10%, ensuring complete combustion and uniform combustion of the fuel gas, and the temperature must be above the fuel's auto-ignition point to maintain auto-ignition. The preset temperature of the mixed flue gas reaches the auto-ignition temperature of the fuel gas injected by the gas distribution device, enabling the fuel gas injected by the gas distribution device to maintain auto-ignition within the second combustion chamber.

[0083] Because 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 flue gas is relatively low, making it suitable for high-temperature air combustion in the second combustion chamber. When the gas injected by the gas distribution device undergoes high-temperature air combustion, the energy consumption required for combustion is reduced. A fan can be installed outside the burner to supply air into the first combustion chamber, or other structures can be installed outside the burner to input air into the first combustion chamber.

[0084] Within the first combustion chamber, the preheating burner 21 rapidly preheats the air, adjusting the heat load ratio within the first combustion chamber to the aforementioned range of 20%-50%, thereby controlling the emissions of nitrogen oxides and carbon monoxide in the mixed flue gas formed in the first combustion chamber to approximately 10 ppm. Because high-temperature air combustion is a volumetric or diffuse combustion process, it features a low reaction rate, minimal local heat release, uniform heat flow distribution, low peak combustion temperature, and extremely low noise.

[0085] Compared to traditional localized high-temperature combustion in small areas, the high-temperature air combustion in the 16L gas water heater equipped with the burner described in this embodiment occurs over a large area, even throughout the entire second combustion chamber. The flame front disappears within 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 increases, and radiative heat transfer is enhanced. High-temperature flue gas is generated during combustion within the second combustion chamber, and the heat load of combustion in the second combustion chamber accounts for 50%-80%. By controlling the heat load percentage of the second combustion chamber within this range, gentle combustion is achieved, resulting in low-noise combustion and thus reducing the combustion noise of the gas water heater. Furthermore, since the high-temperature flue gas produced by high-temperature air combustion is rich in nitrogen and carbon dioxide, the environmental pollution caused is also relatively reduced.

[0086] By controlling the amount of gas input to the second combustion chamber through the gas distribution device, the proportion of heat load 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.

[0087] Optionally, the burner further includes a premixer 22, disposed in the housing 20, for premixing fuel gas and air to form a mixed gas and then delivering it to the preheating burner 21 and the gas distribution device. The premixer 22 has an air inlet 23 and a fuel gas inlet 24, for introducing air and fuel gas respectively, mixing them to form a mixed gas, and then delivering it to the preheating burner 21 and the gas distribution device. Premixing the gas through the premixer 22 improves the uniformity of the gas and helps to improve the combustion efficiency of the fuel gas.

[0088] Optionally, the burner further includes a distributor 25, disposed on the housing 20 and connected to the premixer 22, for distributing the mixed gas formed by the premixer 22 to the preheating burner 21 and the gas distribution device respectively. The distributor 25 has an inlet end connected to the premixer 22 and an outlet end connected to the preheating burner 21 and the gas distribution device respectively, to achieve gas pre-distribution.

[0089] The present invention also proposes an embodiment of a water heater.

[0090] Please see Figure 10 and Figure 11 The water heater includes: a body 10; a burner as described in any of the above embodiments, disposed in the body 10; and a heat exchanger 11, disposed in the body 10 and connected to the second combustion chamber, for exchanging heat with the flue gas generated by the high-temperature air combustion reaction of the burner.

[0091] The heat exchanger 11 has a preset heat load range according to the required operating conditions. The high-temperature air combustion of the burner generates high-temperature flue gas, which exchanges heat with the heat exchange tubes 12 of the heat exchanger 11 to produce hot water. The water heater may also include a smoke hood 13 and a flue pipe. The cooled flue gas generated by heat exchange through the heat exchanger 11 is discharged through the smoke hood 13 to the flue pipe to discharge the flue gas in a preset direction and at a preset position.

[0092] Optionally, the water heater further includes: a temperature sensor for monitoring the temperature inside the second combustion chamber; and a controller electrically connected to the body 10 and the temperature sensor, for acquiring the temperature inside the second combustion chamber and the required heat load of the water heater; and also for controlling the drive mechanism 38 of the gas distribution device to drive the baffle 36 to slide from the first position to the second position when the temperature inside the second combustion chamber reaches a preset temperature, so that the gas distribution device supplies gas to the second combustion chamber for high-temperature air combustion to reach the required heat load range of the water heater. When the baffle 36 of the gas distribution device slides between the first position and the second position, the amount of gas input to the burner changes, and thus the heat load also changes accordingly. By controlling the sliding of the baffle 36 through the controller, the water heater can meet the heat load range of the water heater under the current operating conditions, reducing the harmful gases such as nitrogen oxides and carbon monoxide produced by the water heater. The controller can use existing software to drive and control the drive mechanism 38.

[0093] The present invention also proposes a control method for a water heater, for use in any of the above embodiments.

[0094] The control method includes:

[0095] S100: Obtain the temperature inside the second combustion chamber and the required heat load of the water heater.

[0096] S200: When the temperature in the second combustion chamber reaches the preset temperature, the drive mechanism 38 of the gas distribution device drives the baffle 36 to slide 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, so as to achieve the heat load range required by the water heater.

[0097] The heat load of the water heater is adapted to the current operating conditions, and the amount of gas input by the gas distribution device of the burner affects the heat load of the water heater. During the sliding process of the baffle 36 driven by the drive mechanism 38, when the baffle 36 reaches a preset position, the heat load generated by the burner is relatively fixed and matches 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 includes: The housing has a gas distribution chamber and an inlet and an outlet respectively connected to the gas distribution chamber; the gas ejected from the outlet burns to form a flame; A partition is provided on the housing, the partition dividing the gas distribution chamber into an air inlet chamber that communicates with the air inlet and an air outlet chamber that communicates with the air outlet, and the partition is provided with a vent hole that communicates with the air inlet chamber and the air outlet chamber; A baffle is slidably disposed on the housing between a first position and a second position, and the baffle is provided with a flow hole; when the baffle is in the first position, the baffle closes the vent hole; when the baffle slides from the first position to the second position, the baffle gradually opens the airflow channel formed by the vent hole; and A drive mechanism is connected to the baffle and is used to drive the baffle to slide between the first position and the second position. When the baffle is in the first position, the baffle closes the airflow channel from the air inlet to the gas distribution chamber. When the baffle slides from the first position to the second position, the flow hole connects to the airflow channel from the air inlet to the gas distribution chamber, and the effective flow rate of the airflow channel gradually increases. The airflow direction at the outlet is set at an angle to the airflow direction at the inlet; a guide surface is formed on the inner wall of the gas distribution chamber, which is used to guide the airflow towards the outlet. The baffle is provided with teeth, and the driving mechanism includes a motor module and a gear connected to the motor module. The gear is meshed with the teeth on the baffle. The housing is provided with a gear cavity for accommodating the gear.

2. The gas distribution device as described in claim 1, characterized in that, The air outlet is equipped with a nozzle, and there are multiple nozzles arranged at intervals.

3. The gas distribution device as described in claim 2, characterized in that, The number of flow passages is multiple, and the multiple flow passages are arranged at intervals, with each of the multiple flow passages corresponding to a single nozzle.

4. The gas distribution device as described in claim 1, characterized in that, The gas distribution device also includes a sealing ring, which is used to seal the gap between the baffle and the housing; The housing has a sealing groove on the side facing the baffle, and the sealing groove is provided with the sealing ring; or, the baffle has a sealing groove on the side facing the housing, and the sealing groove is provided with the sealing ring.

5. The gas distribution device as described in claim 1, characterized in that, The inner wall of the housing is provided with a limiting groove, and the baffle is embedded in the limiting groove. The limiting groove is used to limit the sliding switching of the baffle between the first position and the second position.

6. The gas distribution device as described in claim 1, characterized in that, The volume of the air outlet chamber is larger than the volume of the air inlet chamber.

7. A burner, characterized in that, include: The outer casing contains a first combustion chamber and a second combustion chamber that are interconnected. A preheating burner, located in the outer casing, is used to burn a mixture of gases to heat the air in the first combustion chamber to a preset temperature and deliver it to the second combustion chamber; as well as The gas distribution device as described in any one of claims 1 to 6 is disposed in the housing and is used to inject gas into the second combustion chamber to cause a high-temperature air combustion reaction in the second combustion chamber.

8. The burner as claimed in claim 7, characterized in that, The burner also includes: A premixer, located in the housing, is used to premix fuel gas and air to form a mixed gas, which is then delivered to the preheating burner and the gas distribution device.

9. The burner as claimed in claim 8, characterized in that, The burner also includes: A distributor, located in the housing and connected to the premixer, is used to deliver the mixed gas formed by the premixer to the preheating burner and the gas distribution device, respectively.

10. A water heater, characterized in that, include: Organism; The burner as described in any one of claims 7 to 9 is disposed in the housing; and A heat exchanger is located in the machine body and connected to the second combustion chamber of the burner, for exchanging heat with the flue gas generated by the high-temperature air combustion reaction of the burner.

11. The water heater as described in claim 10, characterized in that, The water heater also includes: Temperature sensor for the temperature inside the second combustion chamber of the burner; and The controller, electrically connected to the body and the temperature sensor, is used to acquire the temperature in the second combustion chamber of the burner and the required heat load of the water heater; and is also used to control the drive mechanism of the gas distribution device of the burner to drive the baffle to slide 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 of the burner supplies gas to the second combustion chamber of the burner for high-temperature air combustion to reach the required heat load range of the water heater.

12. A method for controlling a water heater, used in the water heater as described in claim 10 or 11, characterized in that, The control method includes: Obtain the temperature inside the second combustion chamber and the required heat load of the water heater; and When the temperature in the second combustion chamber reaches the preset temperature, the drive mechanism of the gas distribution device drives the baffle to slide 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, thereby achieving the required heat load range of the water heater.

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