Burner and water heater

Abstract

The present invention discloses a burner and a water heater. The burner includes: a burner main body, which is formed with a first combustion chamber and a second combustion chamber that communicate with each other; a lean-rich combustion device, which is arranged on the burner main body and is used for introducing gas and air, and forming a lean-rich mixed gas for combustion, so as to heat the air in the first combustion chamber to a preset temperature and then transport it to the second combustion chamber; and a gas injection pipe, which has a gas inlet and a gas outlet, and the gas outlet communicates with the second combustion chamber and is used for injecting gas into the second combustion chamber, so that a high-temperature air combustion reaction occurs in the second combustion chamber. By heating the air to the preset temperature through lean-rich combustion and then performing a high-temperature air combustion reaction in the second combustion chamber, the present invention can effectively improve the gas combustion efficiency in the second combustion chamber, reduce the combustion energy consumption, and improve the energy utilization rate.

Description

Technical Field

[0001] The present invention relates to the field of water heaters, and particularly to a burner and a water heater. Background Art

[0002] In existing gas water heaters, gas and air are introduced for combustion to heat water to form hot water and then output. Since the gas is injected into the combustion chamber at a high speed, during the high-speed injection process of the gas, the mixing with air is insufficient, and the content of pollutants such as NOx and CO in the combustion products increases, which is likely to cause air pollution. Summary of the Invention

[0003] The main object of the present invention is to provide a burner and a water heater, aiming to improve the problem of insufficient gas combustion in existing gas water heaters.

[0004] To achieve the above object, the burner proposed by the present invention includes:

[0005] A burner main body, which is formed with a first combustion chamber and a second combustion chamber that are interconnected;

[0006] A lean-rich combustion device, which is arranged on the burner main body and is used for accessing gas and air and forming a lean-rich mixed gas for combustion, so as to heat the air in the first combustion chamber to a preset temperature and then transport it to the second combustion chamber; and

[0007] A gas injection pipe, which has a gas inlet and a gas outlet, and the gas outlet is communicated with the second combustion chamber and is used for injecting gas into the second combustion chamber, so that a high-temperature air combustion reaction occurs in the second combustion chamber.

[0008] Optionally, the number of the lean-rich combustion devices is multiple, and the multiple lean-rich combustion devices are arranged at intervals.

[0009] Optionally, a baffle is arranged on the lean-rich combustion device, and the lean-rich mixed gases formed by adjacent lean-rich combustion devices are isolated by the baffle.

[0010] Optionally, two baffles are respectively arranged on each lean-rich combustion device, and a combustion area for the lean-rich mixed gas to burn is formed between the two baffles of each lean-rich combustion device.

[0011] Optionally, the combustion area is provided with a reduced opening at one end close to the corresponding lean-rich combustion device.

[0012] Optionally, the burner main body further includes:

[0013] An air intake chamber, which is communicated with the first combustion chamber and is used for inputting air into the first combustion chamber.

[0014] Optionally, an air flow channel is formed between the baffles of adjacent rich-lean combustion devices for the gas in the air intake chamber to enter the first combustion chamber.

[0015] Optionally, the burner further includes a temperature measuring device disposed in the first combustion chamber, and the temperature measuring device is used to detect whether the temperature in the first combustion chamber reaches a preset temperature.

[0016] The present invention also provides a water heater, comprising:

[0017] A body;

[0018] The burner as described above, the burner is disposed in the body; and

[0019] A heat exchanger disposed in the body, the body is provided with heat exchange tubes, and the second combustion chamber of the burner is connected to the heat exchanger so that the high-temperature flue gas formed by the combustion reaction of the high-temperature air in the second combustion chamber of the burner enters the heat exchanger and exchanges heat with the heat exchange tubes located in the heat exchanger.

[0020] Optionally, the heat exchange tubes are coiled in a snake shape in the body.

[0021] Optionally, the heat exchange tubes have a water inlet and a water outlet, the water inlet of the heat exchange tubes is arranged close to the rich-lean combustion device of the burner, and the water outlet of the heat exchange tubes is arranged on one side of the heat exchanger away from the rich-lean combustion device of the burner.

[0022] Optionally, the water heater further includes:

[0023] A blower disposed on the body, and the blower is used to input air into the rich-lean combustion device and the first combustion chamber of the burner respectively.

[0024] Optionally, the burner further includes:

[0025] A gas input module disposed on the body, the gas input module is respectively connected to the rich-lean combustion device of the burner and the gas inlet of the gas injection pipe, and is used to input gas into the rich-lean combustion device and the second combustion chamber of the burner respectively.

[0026] Optionally, a viewing window is provided on the main body, and the viewing window corresponds to the position of the second combustion chamber.

[0027] The technical solution of the present invention forms a lean-rich mixed gas by adopting a lean-rich combustion device arranged in the burner body, and heats the air in the first combustion chamber by burning the lean-rich mixed gas, which can improve the gas combustion efficiency; after heating the air to a preset temperature by lean-rich combustion and then carrying out a high-temperature air combustion reaction in the second combustion chamber, the gas combustion efficiency in the second combustion chamber can be effectively improved, the combustion energy consumption can be reduced, and the energy utilization rate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0029] Figure 1 It is a schematic structural diagram of an embodiment in the use state of the burner of the present invention in a water heater;

[0030] Figure 2 It is a schematic structural diagram of the lean-rich combustion device of the present invention;

[0031] Figure 3 It is a schematic structural diagram of the lean-rich combustion device in the use state of the present invention.

[0032] Explanation of the reference numerals in the drawings:

[0033] Label Name Label Name 10 Airframe 11 Heat exchanger 12 Heat exchange tube 13 Water inlet 14 Water outlet 15 Smoke collecting hood 16 Smoke exhaust pipe 17 Viewing window 18 Fan 19 Gas input module 20 First combustion chamber 21 Second combustion chamber 22 Gas injection pipe 23 Air intake chamber 30 Rich and lean combustion device 31 Rich nozzle 32 Lean nozzle 33 Baffle 34 Air and gas rod 35 Outer shell 36 Airflow mixing channel 40 Igniter

[0034] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides a burner, which is applicable to gas water heaters and related products and equipment such as gas wall-hung boilers that use gas combustion to generate high-temperature hot water for household bathing, heating, etc. For the convenience of understanding, the application to a gas water heater is taken as an example below. Figures 1 to 3 This is an embodiment of the burner provided by the present invention.

[0039] Please refer to Figure 1 、 Figure 2 and Figure 3 In an embodiment, the burner includes: a burner body, which is formed with a first combustion chamber 20 and a second combustion chamber 21 that communicate with each other; a lean-rich combustion device 30, disposed on the burner body, for accessing gas and air and forming a lean-rich mixed gas for combustion to heat the air in the first combustion chamber 20 to a preset temperature and then deliver it to the second combustion chamber 21; and a gas injection pipe 22, which has a gas inlet and a gas outlet, and the gas outlet communicates with the second combustion chamber 21 for injecting gas into the second combustion chamber 21 so that a high-temperature air combustion reaction occurs in the second combustion chamber 21.

[0040] At least two chambers are formed inside the burner body, one of which is the first combustion chamber 20 and one is the second combustion chamber 21 that communicates with the first combustion chamber 20. Air is input into the first combustion chamber 20. Gas is input into the second combustion chamber 21 through the gas injection pipe 22.

[0041] Please refer to Figure 2 and Figure 3, the lean-rich combustion device 30 is arranged in the first combustion chamber 20. The lean-rich combustion device 30 has a housing 35, and an air flow mixing channel 36 is formed inside the housing 35. There are at least two air inlets in the lean-rich combustion device 30. Air-gas rods 34 are arranged at the air inlets, and a rich nozzle 31 and a lean nozzle 32 are arranged on the air-gas rods 34. The two air inlets are respectively communicated with two air flow mixing channels 36. The gas and air mixed by the rich nozzle 31 are output through the air flow mixing channel 36 formed inside the housing 35, and the gas and air mixed by the lean nozzle 32 are output through another air flow mixing channel 36 formed inside the housing 35, so that the lean-rich combustion device 30 outputs a lean-rich mixed gas. An igniter 40 is arranged outside the lean-rich combustion device 30, and ignition is carried out through the igniter 40 to enable the lean-rich combustion device 30 to form lean-rich combustion.

[0042] The heat load ratio of the lean-rich combustion device 30 is 20%-50%. Since the lean-rich combustion device 30 can output lean-rich gases (as shown in Figure 1 B), lean-rich flames are formed during combustion. Among them, the oxygen concentration in the rich flame is relatively low, the air is insufficient, and the combustion temperature will decrease; the oxygen concentration in the lean flame is high, the air is excessive, and the combustion temperature will also decrease, thereby reducing the content of nitrogen oxides in the combustion products and further reducing the emission of combustion nitrogen oxides. When the lean-rich flames interact during combustion, it can make the combustion of the lean-rich combustion device 30 more complete and further reduce the emission of carbon monoxide.

[0043] When the lean-rich gas formed by the lean-rich combustion device 30 burns, it heats the air in the first combustion chamber 20 to form a mixed gas in the first combustion chamber 20 (as shown in Figure 1 C). During the continuous combustion process of the lean-rich combustion device 30, the air in the first combustion chamber 20 can be continuously heated to make the mixed gas in the first combustion chamber 20 reach a preset temperature. Optionally in this embodiment, the burner further includes a temperature measuring device, and the temperature measuring device is arranged in the first combustion chamber 20. The temperature measuring device is used to detect whether the temperature in the first combustion chamber 20 reaches the preset temperature. When the mixed gas C in the first combustion chamber 20 reaches the preset temperature, the mixed gas C is input into the second combustion chamber 21. After the mixed gas enters the second combustion chamber 21, gas is injected into the second combustion chamber 21 through the gas outlet of the gas injection pipe 22 in the second combustion chamber 21 to carry out a high-temperature air combustion reaction in the second combustion chamber 21.

[0044] The first combustion chamber 20 is in communication with the second combustion chamber 21. The air in the first combustion chamber 20 can enter the second combustion chamber 21. When the air undergoes rich-lean combustion reaction heating through the rich-lean combustion device 30 in the first combustion chamber 20 and enters the second combustion chamber 21, the heat required for combustion in the second combustion chamber 21 is reduced, thereby reducing the energy consumption required for gas combustion in the second combustion chamber 21.

[0045] During the high-temperature air combustion reaction, the chemical reaction needs to occur in a high-temperature and low-oxygen environment. The temperature of the reactants is higher than their autoignition temperature, and the maximum temperature rise during the combustion process is lower than their autoignition temperature. The volume fraction of oxygen is diluted to an extremely low concentration by the combustion products. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is inhibited, the flame thickness becomes thicker, and the flame front disappears, resulting in a very uniform temperature throughout the second combustion chamber 21, a low combustion peak temperature, extremely low noise, and a significant reduction in the emissions of pollutants such as nitrogen oxides and carbon monoxide. 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% - 10%, to ensure that the gas is fully pyrolyzed and burned evenly, and the temperature should be higher than the autoignition point of the fuel to maintain autoignition.

[0046] The mixed gas C transported from the first combustion chamber 20 to the second combustion chamber 21 is heated to a preset temperature, which is higher than the autoignition temperature of the gas ejected from the gas outlet of the gas injection pipe 22. When the gas burns with the mixed gas C output from the first combustion chamber 20, the heat energy loss generated is relatively low. Since the mixed gas C is a mixed gas heated to the preset temperature, during the process of transporting the mixed gas C to the second combustion chamber 21, the mixing of air and rich-lean combustion products is relatively more uniform, making the temperature in the second combustion chamber 21 uniform and not easily causing problems such as uneven air flow due to uneven temperature in the second combustion chamber 21, and relatively reducing the combustion noise in the second combustion chamber 21. Since the temperature of the mixed gas C is high during the mixing and combustion process of the gas and the mixed gas C, it can effectively improve the combustion sufficiency of the gas, reduce the emissions of nitrogen oxides and carbon monoxide, and reduce the harmful components in the mixed gas (such as Figure 1 shown as D in) formed by the high-temperature air combustion reaction of the gas ejected from the gas injection pipe in the second combustion chamber. In this embodiment, the heat load ratio of the high-temperature air combustion reaction in the second combustion chamber 21 is 50% - 80%.

[0047] After rich-lean combustion is carried out in the first combustion chamber 20, the fuel gas in the gas B formed by rich-lean combustion burns relatively fully, and the combustion temperature is low, so the combustion energy consumption of the whole burner is relatively low. After the hot air flow generated by combustion is mixed with the air in the first combustion chamber 20 to form a mixed gas C, the air in the mixed gas is fully heated. Since the rich-lean combustion device 30 undergoes rich flame and lean flame combustion, the contents of harmful substances such as nitrogen oxides and carbon monoxide in the combustion products are low. In the mixed gas C formed with the air in the first combustion chamber 20, it is a mixed gas of rich-lean combustion products and air. When the mixed gas C is transported to the second combustion chamber 21, the mixed gas C has reached the self-ignition temperature of the fuel gas ejected from the fuel gas injection pipe 22, so that the fuel gas ejected from the fuel gas outlet of the fuel gas injection pipe 22 can burn fully in the second combustion chamber 21. During the combustion process of the rich-lean combustion device 30, the air in the first combustion chamber 20 will be consumed to a certain extent, further reducing the oxygen content in the mixed gas C. When the mixed gas C enters the second combustion chamber 21, the oxygen is diluted to an extremely low concentration, so that the fuel gas ejected from the fuel gas outlet of the fuel gas injection pipe 22 undergoes a high-temperature air combustion reaction with the mixed gas C, reducing the energy consumption required for combustion and greatly reducing the amount of harmful gases generated at the same time.

[0048] Optionally, in this embodiment, to improve the combustion efficiency, the number of the rich-lean combustion devices 30 is multiple, and the multiple rich-lean combustion devices 30 are arranged at intervals. The rich-lean combustion devices 30 perform rich-lean combustion from multiple positions in the first combustion chamber 20, so that the air in the first combustion chamber 20 can be uniformly heated to form a mixed gas C. When the mixed gas C is transported into the second combustion chamber 21, the mixing of the rich-lean combustion products and air in the mixed gas is more sufficient, so that the high-temperature air combustion reaction in the second combustion chamber 21 can be more sufficient, further reducing the emission of harmful gases.

[0049] Optionally, in this embodiment, the burner body further includes: an air intake chamber 23, which is connected to the first combustion chamber 20 and is used to input air into the first combustion chamber 20. The air intake chamber 23 can be used to connect to an external fan 18 to input air into the first combustion chamber 20, and can also be used to input air into the rich-lean combustion device 30. The rich-lean combustion device 30 can be arranged in the air intake chamber 23 to make full use of the internal space of the air intake chamber 23. When there are multiple rich-lean combustion devices 30, the multiple rich-lean combustion devices 30 are arranged at intervals to form multiple channels for transporting air, and the air flows along as Figure 1It is transported to the first combustion chamber 20 as shown in A in the figure to achieve dispersed diversion, so that air is dispersed and transported to the first combustion chamber 20. When lean-rich combustion reaction occurs in the first combustion chamber 20, air can be fully heated. In this embodiment, multiple lean-rich combustion devices 30 can be evenly spaced. When air enters the air intake chamber 23, it can be evenly transported into the first combustion chamber 20, further improving the uniformity of the mixed gas C.

[0050] In one embodiment, when multiple lean-rich combustion devices 30 are provided, baffles 33 are provided on the lean-rich combustion devices 30, and the lean-rich mixed gas formed by adjacent lean-rich combustion devices 30 is isolated by the baffles 33. The baffle 33 extends from the lean-rich combustion device 30 towards the second combustion chamber 21, so that the flames formed by the combustion of each lean-rich combustion device 30 are isolated from each other, thereby avoiding the counterflow between the airflows ejected by adjacent lean-rich combustion devices 30, which helps to improve the combustion stability of the lean-rich combustion device 30 and further improve the combustion efficiency of the fuel gas. The baffle 33 can form a guiding structure for guiding the combustion products of the lean-rich combustion device 30 towards the second combustion chamber 21, so that the high-temperature combustion products B formed by the lean-rich combustion device 30 can be transported towards the second combustion chamber 21 in a preset direction. When the high-temperature combustion products B are mixed with the air in the first combustion chamber 20 to form the mixed gas C, the uniformity of the mixed gas is better.

[0051] Optionally, two baffles 33 are respectively provided on each lean-rich combustion device 30, and a combustion area for the combustion of the lean-rich mixed gas is formed between the two baffles 33 of each lean-rich combustion device 30. The lean-rich airflows formed by the lean-rich combustion device 30 are fully combusted in the combustion area to avoid the counterflow of airflows between adjacent lean-rich combustion devices 30. When the lean-rich airflows of the lean-rich combustion device 30 are combusted in the combustion area, due to the limitation of the combustion area, the lean-rich airflows formed by the lean-rich combustion device 30 can be combusted according to the preset state of the lean-rich combustion device 30, so that the fuel gas in the lean-rich combustion device 30 is fully combusted. The influence of the lean-rich combustion device 30 on the air in the first combustion chamber 20 can also be controlled within a preset range, so that the air content in the formed mixed gas C is controllable, and the combustion reaction effect of the high-temperature air in the second combustion chamber 21 is relatively more controllable.

[0052] The two baffles 33 limit the combustion area of each lean-rich combustion device 30, so that the high-temperature combustion products B formed by each lean-rich combustion device 30 can heat the air in the first combustion chamber 20 at a preset position, so that the mixed gas B in the first combustion chamber 20 can present a preset uniform temperature state.

[0053] When the air intake chamber 23 is provided, air A flows along the passage between adjacent lean-rich combustion devices 30. The baffle 33 enables the high-temperature combustion products B of the lean-rich combustion device 30 to flow in the direction defined by the baffle 33 towards the second combustion chamber 21. The air in the air intake chamber 23 moves towards the first combustion chamber 20 in the direction as shown in Figure A. The baffle 33 can block the turbulent flow of air A to the high-temperature combustion products B of the lean-rich combustion device 30, making the combustion of the lean-rich combustion device 30 more stable.

[0054] Further optionally, the combustion area is provided with a reduced opening at one end close to the corresponding lean-rich combustion device 30. When the lean and rich airflows are ejected and burned from the lean-rich combustion device 30, since the combustion area gradually expands, part of the air in the combustion area can be absorbed during the lean-rich combustion process, enabling the fuel gas in the lean and rich gases ejected by the lean-rich combustion device 30 to burn fully, which helps to improve the combustion efficiency.

[0055] Optionally, an air flow passage is formed between the baffles 33 of adjacent lean-rich combustion devices 30 for the gas in the air intake chamber 23 to enter the first combustion chamber 20. Since the combustion area formed by the baffle 33 has a reduced opening at one end close to the lean-rich combustion device 30, the baffles 33 of adjacent lean-rich combustion devices 30 form an air flow passage with a gradually decreasing width. When the air enters the air flow passage, due to the decrease in the width of the air flow passage, the flow rate of air A increases. When air A enters the first combustion chamber 20, the flow rate of air A increases, enabling it to quickly shoot into the first combustion chamber 20 to quickly mix with the combustion products of the lean-rich combustion device 30, which helps to improve the uniformity of the mixed gas C in the first combustion chamber 20.

[0056] The present invention also provides an embodiment of a water heater. The water heater includes: a body 10; a burner as described in any of the above embodiments, the burner being provided in the body 10; and a heat exchanger 11 provided in the body 10. The body 10 is provided with a heat exchange tube 12. The second combustion chamber 21 of the burner is connected to the heat exchanger 11 so that the high-temperature flue gas formed by the combustion reaction of the high-temperature air in the second combustion chamber 21 of the burner enters the heat exchanger 11 and exchanges heat with the heat exchange tube 12 located in the heat exchanger 11.

[0057] The body 10 forms the overall housing 35 of the water heater, and the burner is provided in the body 10. The high-temperature flue gas D formed by the combustion reaction of the high-temperature air in the second combustion chamber 21 of the burner enters the heat exchanger 11 and exchanges heat with the heat exchange tube 12 in the heat exchanger 11 to form flue gas E and be discharged.

[0058] Other functional components may also be included on the water heater, such as a smoke hood 15 for concentrating the flue gas E formed after heat exchange and conveying it to the exhaust pipe 16 of the water heater. Optionally, a viewing window 17 is provided on the main body, and the viewing window 17 corresponds to the position of the second combustion chamber 21 to facilitate the user to observe the combustion condition of the second combustion chamber 21.

[0059] By adopting a high-temperature air combustion reaction to form high-temperature flue gas, the combustion efficiency of the gas can be improved, and the generation of nitrogen oxides and carbon monoxide can be reduced. Due to the adoption of the high-temperature air combustion reaction, the energy consumption required for the combustion of the water heater itself is reduced, and the energy utilization rate of the gas is improved. To improve the heat exchange efficiency, optionally, in this embodiment, the heat exchange tube 12 is coiled in a serpentine shape inside the body 10. The heat exchange time of the heat exchange tube 12 with the high-temperature flue gas is increased to improve the heat exchange efficiency. The heat exchange tube 12 is wound in a serpentine shape inside the body 10, which can effectively utilize the internal space of the body 10.

[0060] The air input device of the burner can be arranged on the body 10. Optionally, a fan 18 can be arranged outside the body 10 to input air to the lean-rich combustion device 30 and the first combustion chamber 20 of the burner through the fan 18. The device for supplying gas to the burner can be integrated on the body 10. Optionally, a gas input module 19 is provided on the body 10, and the gas input module 19 is respectively connected to the gas inlets of the lean-rich combustion device 30 of the burner and the gas injection pipe 22 for respectively inputting gas to the lean-rich combustion device 30 of the burner and the second combustion chamber 21. Valves can be respectively arranged on the gas input module 19 for opening and closing the pipelines connecting the gas injection pipe 22 and the lean-rich combustion device 30.

[0061] In one embodiment, the heat exchange tube 12 has a water inlet 13 and a water outlet 14. The water inlet 13 of the heat exchange tube 12 is arranged close to the lean-rich combustion device 30 of the burner, and the water outlet 14 of the heat exchange tube 12 is arranged on the side of the heat exchanger 11 away from the lean-rich combustion device 30 of the burner.

[0062] The heat exchange tube 12 is arranged in a serpentine winding manner from the rich-lean combustion device 30 towards the heat exchanger 11, so that the heat exchange tube 12 can make full use of the internal space of the machine body 10. Since the air in the first combustion chamber 20 is heated by combustion of the rich-lean combustion device 30, the normal temperature water in the heat exchange tube 12 can initially exchange heat with the flue gas in the first combustion chamber 20. When the water in the heat exchange tube 12 gradually flows towards the heat exchanger 11, the temperature of the gas outside the heat exchange tube 12 gradually rises, and the water temperature output from the water outlet 14 of the heat exchange tube 12 gradually increases until it reaches the preset hot water temperature. Since the low-temperature water gradually exchanges heat with the flue gas, during the process of the water flowing along the heat exchange tube 12, it can be gradually and evenly heated, and the uniformity of the hot water temperature output from the water outlet 14 is relatively higher.

Claims

1. A burner, characterized in that, Comprising: A burner body, which is formed with a first combustion chamber and a second combustion chamber that communicate with each other; A rich-lean combustion device, which is arranged on the burner body and is used for accessing gas and air, and forming a rich-lean mixed gas for combustion, so as to heat the air in the first combustion chamber to a preset temperature and then transport it to the second combustion chamber; And A gas injection pipe, which has a gas inlet and a gas outlet, and the gas outlet communicates with the second combustion chamber and is used for injecting gas into the second combustion chamber, so that a high-temperature air combustion reaction occurs in the second combustion chamber; When the rich-lean gas formed by the rich-lean combustion device burns, it can heat the air in the first combustion chamber, so as to form a mixed gas in the first combustion chamber; When the mixed gas in the first combustion chamber reaches the preset temperature, the mixed gas is input into the second combustion chamber; the gas burns with the mixed gas output from the first combustion chamber; The preset temperature is the temperature that can reach the spontaneous combustion temperature of the gas injected by the gas injection pipe.

2. The burner according to claim 1, characterized in that, The number of the rich-lean combustion devices is multiple, and the multiple rich-lean combustion devices are arranged at intervals.

3. The burner according to claim 2, characterized in that, A baffle is arranged on the rich-lean combustion device, and the rich-lean mixed gas formed by adjacent rich-lean combustion devices is isolated by the baffle.

4. The burner according to claim 3, characterized in that, Two of the baffles are respectively arranged on each rich-lean combustion device, and a combustion area for the rich-lean mixed gas to burn is formed between the two baffles of each rich-lean combustion device.

5. The burner according to claim 4, characterized in that, The combustion area is provided with a reduced opening at one end close to the corresponding rich-lean combustion device.

6. The burner according to claim 4, characterized in that, The burner body further includes: An air intake chamber, which is connected to the first combustion chamber and is used for inputting air into the first combustion chamber.

7. The burner according to claim 6, characterized in that, An air flow channel is formed between the baffles of adjacent rich-lean combustion devices for the gas in the air intake chamber to enter the first combustion chamber.

8. The burner according to claim 1, characterized in that, The burner further includes a temperature measuring device, which is arranged in the first combustion chamber and is used for detecting whether the temperature in the first combustion chamber reaches the preset temperature.

9. A water heater, characterized in that, Comprising: A body; The burner according to any one of claims 1 to 8, and the burner is arranged in the body; And A heat exchanger, which is arranged in the body, and the body is provided with heat exchange tubes. The second combustion chamber of the burner is connected to the heat exchanger, so that the high-temperature flue gas formed by the high-temperature air combustion reaction in the second combustion chamber of the burner enters the heat exchanger and exchanges heat with the heat exchange tubes located in the heat exchanger.

10. The water heater according to claim 9, characterized in that, The heat exchange tubes are coiled in a snake shape in the body.

11. The water heater according to claim 10, wherein, The heat exchange tubes have a water inlet and a water outlet. The water inlet of the heat exchange tubes is arranged close to the rich-lean combustion device of the burner, and the water outlet of the heat exchange tubes is arranged on one side of the heat exchanger far from the rich-lean combustion device of the burner.

12. The water heater according to claim 9, characterized in that, The water heater further includes: A blower, which is arranged on the body and is used for respectively inputting air into the rich-lean combustion device and the first combustion chamber of the burner.

13. The water heater according to claim 9, characterized in that, The burner further includes: The gas input module is provided on the body. The gas input module is respectively connected to the rich and lean combustion device of the burner and the gas inlet of the gas injection pipe, and is used to respectively input gas to the rich and lean combustion device of the burner and the second combustion chamber.

14. The water heater according to claim 9, characterized in that, A viewing window is provided on the main body, and the viewing window corresponds to the position of the second combustion chamber.

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