Burners and gas water heaters

Abstract

The present invention discloses a burner and a gas water heater. The burner includes a shell, a preheating burner, an air injection assembly, and a gas injection assembly; a first combustion chamber and a second combustion chamber connected in sequence are formed in the shell; the preheating burner is arranged in the shell, and is used to generate preheating combustion in the first combustion chamber and heat the flue gas in the first combustion chamber to a target temperature; the air injection assembly is connected to the second combustion chamber, and is used to inject air into the second combustion chamber; the gas injection assembly is connected to the second combustion chamber, 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. In this embodiment, by arranging the air injection assembly and the gas injection assembly to simultaneously inject air and gas into the second combustion chamber, the mixing speed of the air and gas is accelerated, the mixing time is shortened, and the air and gas are mixed more evenly, so as to achieve full combustion and reduce the emission of pollutants such as NOx and CO.

Description

Technical Field

[0001] The present invention relates to the field of combustion technology, and in particular to a burner and a gas water heater. Background Art

[0002] Gas water heaters heat water through combustion, transferring heat to cold water flowing through a heat exchanger to produce hot water. Existing gas water heaters, which burn gas in a combustion chamber, experience uneven mixing of gas and air, resulting in high noise levels. Incomplete combustion within the combustion chamber can easily generate nitrogen oxides and carbon monoxide, and the combustion products can easily pollute the environment. Summary of the Invention

[0003] The main purpose of the present invention is to provide a burner to solve the technical problem of incomplete combustion in existing gas water heaters, which easily generates a large amount of emissions of pollutants such as NOx and CO.

[0004] To achieve the above-mentioned objectives, the burner proposed in the present invention includes a shell, a preheating burner, an air injection assembly and a gas injection assembly; a first combustion chamber and a second combustion chamber connected in sequence are formed in the shell; the preheating burner is arranged in the shell, and is used to produce preheating combustion in the first combustion chamber and heat the flue gas in the first combustion chamber to a target temperature; the air injection assembly is connected to the second combustion chamber, and is used to inject air into the second combustion chamber; the gas injection assembly is connected to the second combustion chamber, 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.

[0005] In one embodiment of the present invention, the burner also includes an air supply assembly, which includes an air inlet and a first air branch and a second air branch connected to the air outlet side of the air inlet, the first air branch is connected to the preheating burner, and the second air branch is connected to the air injection assembly.

[0006] In one embodiment of the present invention, the air injection assembly includes an air distribution rod connected to the second air branch and a plurality of air nozzles, one end of the plurality of air nozzles is connected to the air distribution rod, and the other end penetrates the side wall of the shell to inject air into the second combustion chamber.

[0007] In one embodiment of the present invention, the burner further includes a gas supply pipeline, which includes a gas main pipe, a first gas branch pipe, and a second gas branch pipe. The first gas branch pipe connects the gas main pipe with the preheating burner, and the second gas branch pipe connects the gas main pipe with the gas injection assembly.

[0008] In one embodiment of the present invention, the gas injection assembly includes a gas distribution rod connected to the second gas branch pipe and a plurality of gas nozzles, one end of the plurality of gas nozzles is connected to the gas distribution rod, and the other end is passed through the side wall of the shell to inject gas into the second combustion chamber.

[0009] In one embodiment of the present invention, the gas nozzle and the air nozzle are disposed on the same side of the shell.

[0010] In one embodiment of the present invention, the number of the air nozzles and the number of the gas nozzles located on the same side of the housing are the same.

[0011] In one embodiment of the present invention, the plurality of air nozzles located on the same side of the shell are arranged in a row, the plurality of gas nozzles are arranged in a row, and the plurality of air nozzles and the plurality of gas nozzles are arranged side by side.

[0012] In one embodiment of the present invention, a vertical distance between the air nozzle and the gas nozzle located on the same side of the shell is between 5 mm and 50 mm.

[0013] In one embodiment of the present invention, the diameter of the air nozzle is larger than the diameter of the gas nozzle.

[0014] In one embodiment of the present invention, the gas distribution rod and the air distribution rod located on the same side of the shell are an integrated structure.

[0015] In one embodiment of the present invention, the burner includes two groups of air injection assemblies and two groups of gas injection assemblies, the two groups of air injection assemblies are arranged on opposite sides of the second combustion chamber, and the two groups of gas injection assemblies are arranged on opposite sides of the second combustion chamber, and the air injection assemblies and the gas injection assemblies are correspondingly arranged on the same side wall of the second combustion chamber.

[0016] In one embodiment of the present invention, the preheating burner is a fire bar assembly, and an installation chamber for installing the fire bar assembly is further formed in the shell, and the installation chamber is connected to the first combustion chamber; the first air branch is connected to the installation chamber.

[0017] In one embodiment of the present invention, the fire grate assembly includes a fire grate gas distribution rod and a plurality of fire grate units arranged side by side, and the plurality of fire grate units are all connected to the fire grate gas distribution rod, and the fire grate gas distribution rod is connected to the first gas branch; the plurality of fire grate units are used to draw the air and gas from the installation room into the mixture to spray fire into the first combustion chamber.

[0018] In one embodiment of the present invention, an air gap is formed between two adjacent fire bar units, and the air gap is communicated with the first combustion chamber.

[0019] To achieve the above-mentioned objectives, the present invention further provides a gas water heater, comprising a heat exchanger and the aforementioned burner, wherein the heat exchanger is connected to the second combustion chamber of the burner to produce hot water using the heat generated in the second combustion chamber. The burner comprises a housing, a preheating burner, an air injection assembly, and a gas injection assembly; a first combustion chamber and a second combustion chamber, which are sequentially connected, are formed in the housing; the preheating burner is disposed in the housing and is used to generate preheating combustion in the first combustion chamber and heat the flue gas in the first combustion chamber to a target temperature; the air injection assembly is connected to the second combustion chamber and is used to inject air into the second combustion chamber; and the gas injection assembly is connected to the second combustion chamber 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.

[0020] In the burner of the embodiment of the present invention, a first combustion chamber and a second combustion chamber connected in sequence are formed within the shell. A preheat burner is provided within the shell to spray fire in the first combustion chamber to generate preheated combustion and transport the resulting flue gas to the second combustion chamber. At the same time, an air injection assembly is provided to spray air into the second combustion chamber, and a gas injection assembly is provided to spray gas into the second combustion chamber. The jetted air and gas are rapidly mixed and the high-temperature flue gas transported from the first combustion chamber is entrained, thereby generating a high-temperature air combustion reaction in the second combustion chamber. In this embodiment, the air injection assembly and the gas injection assembly are provided to simultaneously spray air and gas into the second combustion chamber, thereby accelerating the mixing speed of the air and gas, shortening the mixing time, and making the air and gas mix more evenly, thereby achieving full combustion and reducing the emission of pollutants such as NOx and CO. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0022] Figure 1 This is a schematic structural diagram of an embodiment of a burner of the present invention;

[0023] Figure 2 Another structural schematic diagram of an embodiment of a burner of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the air injection assembly, gas injection assembly and fire grate assembly in the burner embodiment of the present invention;

[0025] Figure 4It is a schematic cross-sectional structure diagram of a burner embodiment of the present invention.

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 case 400 Gas injection assembly 110 First combustion chamber 410 Gas nozzle 120 Second combustion chamber 420 Gas distribution rod 130 Installation room 510 First air branch 200 Fire broiler components 520 Second air branch 210 Fire broiler unit 530 Air introduction parts 220 Fire exhaust gas rod 610 First gas branch 201 air gap 620 Second gas branch 300 Air jet assembly 601 First gas valve 310 air nozzle 602 Second gas valve 320 Air distribution rod 700 heat exchanger

[0028] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] 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 for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can 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.

[0032] This invention proposes a burner suitable for use in gas water heaters and related products and equipment, including wall-mounted gas boilers, that use gas combustion to generate high-temperature hot water for household bathing and heating, aiming to effectively reduce pollutant (CO and NOx) emissions. For ease of understanding, the following application to a gas water heater is used as an example.

[0033] In the embodiment of the present invention, Figures 1 to 4 As shown, the burner includes a housing 100 , a preheat burner, an air injection assembly 300 and a gas injection assembly 400 .

[0034] The housing 100 includes a first combustion chamber 110 and a second combustion chamber 120 that are connected in sequence.

[0035] The preheating burner is provided in the housing 100 and is used to generate preheating combustion in the first combustion chamber 110 and heat the flue gas in the first combustion chamber 110 to a target temperature;

[0036] The air injection assembly 300 is connected to the second combustion chamber 120 and is used to inject air into the second combustion chamber 120;

[0037] The gas injection assembly 400 is connected to the second combustion chamber 120 and is used to inject gas into the second combustion chamber 120 so that a high-temperature air combustion reaction occurs in the second combustion chamber 120 .

[0038] A first combustion chamber 110 and a second combustion chamber 120 that are connected in sequence are formed in the shell 100. The preheating burner can perform preheating combustion in the first combustion chamber 110, heat the first combustion chamber 110 to a target temperature, and transport the high-temperature flue gas generated by the combustion to the second combustion chamber 120. At this time, air is sprayed toward the second combustion chamber 120 through the air injection assembly 300, and gas is sprayed toward the second combustion chamber 120 through the gas injection assembly 400, so that the gas and air injected into the second combustion chamber 120 can be quickly mixed, and the high-temperature flue gas transported from the first combustion chamber 110 can be sucked in to preheat the gas-air mixture. At the same time, the suction of the high-temperature flue gas will form a flue gas reflux, so that part of the high-temperature flue gas circulates in the second combustion chamber 120 to dilute the reactants, and then fully dilutes the injected gas and air to form a lower oxygen concentration, reduce the combustion reaction rate, and maintain a higher temperature in the second combustion chamber 120 to ensure that the temperature is higher than the auto-ignition point of the fuel, achieve self-ignition, and thus realize a high-temperature air combustion reaction.

[0039] It should be noted that in this embodiment, by injecting high-speed air and high-speed gas toward the second combustion chamber 120, the high-speed jets of air and gas can entrain and dilute the high-temperature flue gas, allowing the gas and air in the second combustion chamber 120 to mix evenly and the oxygen concentration inside the second combustion chamber 120 to be balanced. As a result, during combustion, the gas can be fully burned, thereby reducing the emission of pollutants such as NOx and CO. At the same time, due to the uniform combustion in the second combustion chamber 120, there will be no problem of local excessive combustion and noise. In addition, the entrainment effect of the high-speed jets of air and gas also achieves the backflow of high-temperature flue gas, which can keep the temperature of the second combustion chamber 120 above the auto-ignition point of the fuel. As long as the gas and air are continuously injected into the second combustion chamber 120, combustion can be maintained. The heat after combustion can be exchanged with the heat exchanger 700 of the gas water heater to produce hot water.

[0040] It is understood that the placement of the air injection assembly 300 and the gas injection assembly 400 can be determined based on actual circumstances, such as being positioned on opposite side walls of the housing 100 or around the periphery of the housing 100. The air injection assembly 300 is used to inject air into the second combustion chamber 120, providing air conditions for high-temperature air combustion within the second combustion chamber 120. Similarly, the gas injection assembly 400 injects gas into the second combustion chamber 120, providing gas conditions for high-temperature air combustion within the second combustion chamber 120. When the air and gas are evenly mixed, the high-temperature air combustion reaction will be more complete. In actual applications, the air injection assembly 300 can be positioned close to the gas injection assembly 400, such as both being located on the same side of the housing 100, so that the air and gas injected into the second combustion chamber 120 can mix rapidly. Alternatively, the air and gas can be mixed outside the second combustion chamber 120 before being injected into the second combustion chamber 120.

[0041] In actual application, the structural forms of the air injection assembly 300 and the gas injection assembly 400 may also be determined according to actual conditions, such as a nozzle structure, a multi-nozzle structure, or a nozzle structure, etc.

[0042] In actual application, the air participating in the high-temperature air combustion reaction in the second combustion chamber 120 can also be supplied from the first combustion chamber 110. For example, the high-temperature flue gas generated by the preheating burner after preheating and combustion in the first combustion chamber 110 still contains a certain amount of air. On this basis, air can be added to the first combustion chamber 110 so that it enters the second combustion chamber 120 along with the high-temperature flue gas, thereby ensuring the amount of air required for the high-temperature air combustion in the second combustion chamber 120. It should be noted that if all the air in the second combustion chamber 120 is supplied from the first combustion chamber 110, that is, only the gas injection assembly 400 injects gas into the second combustion chamber 120, the mixing time between the air required for combustion and the injected gas may be prolonged, resulting in some gas and air not being fully mixed before being discharged from the exhaust port, causing incomplete combustion, or requiring the height dimension of the second combustion chamber 120 to be increased, resulting in an excessively large structural volume. Based on this, in this embodiment, by setting an air injection assembly 300 at the second combustion chamber 120, air can be injected directly toward the second combustion chamber 120, so that the injected air and the fuel gas can be quickly mixed at high speed, shortening the mixing time of the air and the fuel gas, accelerating the efficiency of high-temperature air combustion, and achieving the effect of full combustion, without the need to increase the structural volume.

[0043] It should also be noted that the target temperature of the high-temperature preheated air cannot be too low, and should not be lower than degrees Celsius as much as possible. Generally, controlling it to 1200 degrees Celsius can ensure that when the high-temperature gas contacts the gas and air in the second combustion chamber 120, it can achieve better automatic combustion, and no ignition is required. Among them, to achieve the target temperature, it can be achieved by controlling the combustion time of the preheating burner, controlling the ratio of gas to air, performing heat preservation, increasing the residence time of the high-temperature gas in the first combustion chamber 110, etc. Optionally, the specific structural form of the preheating burner is not limited, such as a fire bar burner, an induced burner, a full premixed burner or a semi-premixed burner, etc., as long as it can burn in the first combustion chamber 110, the flue gas temperature in the first combustion chamber 110 is heated to the target temperature to reach the auto-ignition point of the combustion of gas and air.

[0044] In this embodiment, the heat obtained from the high-temperature air combustion reaction in the second combustion chamber 120 can be exchanged with the heat exchanger in the gas water heater to achieve the function of producing hot water.

[0045] In the burner of the embodiment of the present invention, a first combustion chamber 110 and a second combustion chamber 120, which are connected in sequence, are formed within the housing 100. A preheat burner is provided within the housing 100 to spray fire in the first combustion chamber 110 to generate preheated combustion and to transport the resulting flue gas to the second combustion chamber 120. Simultaneously, an air injection assembly 300 is provided to inject air into the second combustion chamber 120, and a gas injection assembly 400 is provided to inject gas into the second combustion chamber 120. The injected jets of air and gas are rapidly mixed, and the high-temperature flue gas transported from the first combustion chamber 110 is entrained, thereby generating a high-temperature air combustion reaction within the second combustion chamber 120. In this embodiment, the air injection assembly 300 and the gas injection assembly 400 are provided to simultaneously inject air and gas into the second combustion chamber 120, thereby accelerating the mixing speed of the air and gas, shortening the mixing time, and ensuring a more uniform mixing of the air and gas, thereby achieving sufficient combustion and reducing the emission of pollutants such as NOx and CO.

[0046] In one embodiment of the present invention, referring to Figures 1 to 4 The burner also includes an air supply assembly, which includes an air inlet 530 and a first air branch 510 and a second air branch 520 connected to the air outlet side of the air inlet 530. The first air branch 510 is connected to the preheating burner, and the second air branch 520 is connected to the air injection assembly 300.

[0047] As can be understood, the air supply assembly provides the burner with the air required for combustion. The air supply assembly includes an air intake 530, a first air branch 510, and a second air branch 520. The air intake 530 can be a fan. The first air branch 510 is connected to the preheat burner to provide air for the preheat burner. The second air branch 520 is connected to the air injection assembly 300 to provide air for the high-temperature air combustion in the second combustion chamber 120. The first air branch 510 and the second air branch 520 are both connected to the air outlet side of the fan.

[0048] Optionally, when the first air branch 510 provides air to the preheat burner, some of the air may enter the first combustion chamber 110 and then enter the second combustion chamber 120 to participate in high-temperature air combustion. In other words, the air in the first air branch 510 can simultaneously provide air to the preheat burner and the second combustion chamber 120. Alternatively, the first air branch 510 may be connected only to the preheat burner, providing air only to the preheat burner. The specific connection method can be determined based on the actual structure of the burner and is not specifically limited here.

[0049] In one embodiment, the air injection assembly 300 includes an air distribution rod 320 connected to the second air branch 520 and a plurality of air nozzles 310, one end of the plurality of air nozzles 310 is connected to the air distribution rod 320, and the other end penetrates the side wall of the shell 100 to inject air into the second combustion chamber 120.

[0050] In this embodiment, the air injection assembly 300 includes an air distributor rod 320 and a plurality of air nozzles 310. The air distributor rod 320 serves to connect the second air branch 520 and the plurality of air nozzles 310, so as to be able to divert the air in the second air branch 520 to the plurality of air nozzles 310, thereby enabling the plurality of air nozzles 310 to spray air toward the second combustion chamber 120. Optionally, from a structural implementation, the air nozzles 310 are arranged through the side walls of the housing 100, so that the air is ejected by the air nozzles 310 after entering the interior of the second combustion chamber 120, thereby ensuring the sealing of the second combustion chamber 120 and preventing internal gas from leaking out. It is understandable that the air distributor rod 320, while diverting the air, can also adjust the air flow rate of the plurality of air nozzles 310.

[0051] In actual applications, the arrangement of the multiple air nozzles 310 can be determined according to actual conditions, such as being arranged in rows, in a ring, or in an irregular shape. Optionally, the multiple air nozzles 310 can be arranged at intervals to increase the air injection range of the air injection assembly 300.

[0052] In one embodiment of the present invention, referring to Figures 1 to 4 The burner also includes a gas supply pipeline, which includes a gas main, a first gas branch 610 and a second gas branch 620. The first gas branch 610 connects the gas main with the preheating burner, and the second gas branch 620 connects the gas main with the gas injection assembly 400.

[0053] As will be appreciated, the gas main is used to connect to an external gas source, providing gas to the preheat burner via the first gas branch 610 and to the second combustion chamber 120 via the second gas branch 620. Optionally, a first gas valve 601 is provided on the first gas branch 610, and a second gas valve 602 is provided on the second gas branch 620, so that the first gas branch 610 and the second gas branch 620 can be independently controlled. Optionally, the first gas valve 601 and the second gas valve 602 can be solenoid valves and gas proportional valves, respectively, to adjust the gas distribution ratio between the first gas branch 610 and the second gas branch 620 according to the load requirements within different combustion chambers to ensure the required load for combustion.

[0054] In one embodiment, the gas injection assembly 400 includes a gas distribution rod 420 connected to the second gas branch 620 and a plurality of gas nozzles 410, one end of the plurality of gas nozzles 410 is connected to the gas distribution rod 420, and the other end is passed through the side wall of the shell 100 to inject gas into the second combustion chamber 120.

[0055] In this embodiment, the gas injection assembly 400 includes a gas distribution rod 420 and a plurality of gas nozzles 410. The gas distribution rod 420 serves to connect the second gas branch 620 and the plurality of gas nozzles 410, so as to divert the gas in the second gas branch 620 to the plurality of gas nozzles 410, thereby enabling the plurality of gas nozzles 410 to spray gas toward the second combustion chamber 120. Optionally, from a structural perspective, the gas nozzles 410 are arranged through the side walls of the housing 100 so that the gas is injected into the second combustion chamber 120 after entering the second combustion chamber 120, thereby ensuring the sealing of the second combustion chamber 120 and preventing internal gas leakage. It is understandable that the gas distribution rod 420, while diverting the gas, can also adjust the gas flow rate of the plurality of gas nozzles 410.

[0056] In actual applications, the arrangement of the multiple gas nozzles 410 can be determined according to actual conditions, such as being arranged in rows, in a ring, or in an irregular shape. Optionally, the multiple gas nozzles 410 can be arranged at intervals to increase the gas injection range of the gas injection assembly 400.

[0057] In order to further speed up the mixing efficiency of air and gas, refer to Figures 1 to 4 In one embodiment of the present invention, the gas nozzle 410 and the air nozzle 310 are disposed on the same side of the housing 100 .

[0058] It can be understood that the gas nozzle 410 and the air nozzle 310 are correspondingly arranged on the same side of the shell 100, so that the gas and air can be ejected from the same side of the shell 100. Under high-speed jets, the ejected gas and air can quickly draw in high-temperature flue gas and quickly mix evenly.

[0059] In actual application, a set of air injection assemblies 300 includes multiple air nozzles 310, and a set of gas injection assemblies 400 includes multiple gas nozzles 410. By arranging the set of air injection assemblies 300 and the set of gas injection assemblies 400 on the same side of the housing 100, the multiple gas nozzles 410 and the multiple air nozzles 310 are located on the same side of the housing 100, thereby achieving the purpose of rapid mixing of air and gas. It should be noted that the injection speed of air and gas is relatively high. In order to prevent the high-temperature flue gas generated by the injection of gas and air from affecting the opposite side walls of the housing 100, the air injection assemblies 300 and the gas injection assemblies 400 can also be arranged on the opposite side walls of the housing 100. Optionally, the air nozzles 310 of the air injection assemblies 300 on opposite sides can be arranged symmetrically or staggered, and the gas nozzles 410 of the gas injection assemblies 400 on opposite sides can be arranged symmetrically or staggered. In this way, by injecting air and gas in opposite directions, the mixing speed of gas and air can be further accelerated.

[0060] In one embodiment, the number of the air nozzles 310 and the number of the gas nozzles 410 located on the same side of the housing 100 are the same.

[0061] In this embodiment, by setting the number of air nozzles 310 and gas nozzles 410 located on the same side of the housing 100 to be the same, the injected gas and air are mixed more evenly, thereby achieving more complete combustion.

[0062] Of course, in actual application, the number of air nozzles 310 and the number of gas nozzles 410 located on the same side of the shell 100 may also be different. On this basis, the gas-to-air ratio required for high-temperature air combustion can be ensured by adjusting the aperture size of the air nozzles 310 and the gas nozzles 410 or the intensity and flow rate of the injected gas, etc.

[0063] Optionally, in order to ensure sufficient combustion in the second combustion chamber 120, the aperture size of the air nozzle 310 can be set to be larger than the aperture size of the gas nozzle 410 to ensure the excess air coefficient of the high-temperature air combustion reaction and achieve the purpose of sufficient combustion.

[0064] In one embodiment, the plurality of air nozzles 310 located on the same side of the housing 100 are arranged in a row, the plurality of gas nozzles 410 are arranged in a row, and the plurality of air nozzles 310 and the plurality of gas nozzles 410 are arranged side by side.

[0065] In this embodiment, by arranging multiple air nozzles 310 in a row and multiple gas nozzles 410 in a row, the structures of the air injection assembly 300 and the gas injection assembly 400 are simplified. The multiple air nozzles 310 and the multiple gas nozzles 410 are arranged side by side, allowing the air distribution rod 320 and the gas distribution rod 420 to be structurally integrated, improving the compactness of the structural layout and also enhancing the mixing efficiency of air and gas.

[0066] Optionally, the vertical spacing between the air nozzle 310 and the gas nozzle 410 located on the same side of the housing 100 is between 5 mm and 50 mm. In actual application, the vertical spacing between the air nozzle 310 and the gas nozzle 410 can be determined according to actual conditions and should not be too large or too small. If it is too large, it is easy to cause poor mixing of the injected air and gas. If it is too small, it is more difficult to implement the structure and it is also easy to cause premature mixing of the air and gas, resulting in flashback. Based on this, in this embodiment, the vertical spacing between the air nozzle 310 and the gas nozzle 410 can be 5 mm, 8 mm, 10 mm, 15 mm, 17 mm, 20 mm, 25 mm, 30 mm, 33 mm, 36 mm, 40 mm, 45 mm, or 50 mm, etc. The specific spacing sizes are not listed here one by one.

[0067] In one embodiment of the present invention, referring to Figures 1 to 4 The preheating burner is a fire bar assembly 200 , and an installation chamber 130 for installing the fire bar assembly 200 is also formed in the shell 100 . The installation chamber 130 is connected to the first combustion chamber 110 ; the first air branch 510 is connected to the installation chamber 130 .

[0068] When the preheating burner is a fire bar assembly 200, an installation chamber 130 for installing the fire bar assembly 200 is formed in the shell 100, and the installation chamber 130 is connected to the first air branch 510. The installation chamber 130 is equivalent to an air chamber. After the gas from the first gas branch 610 is introduced into the fire bar assembly 200, the air in the installation chamber 130 can be drawn into the fire bar assembly 200 to mix with the gas, and then ejected from the flamethrower of the fire bar assembly 200 toward the first combustion chamber 110, so as to achieve the purpose of preheating combustion in the first combustion chamber 110.

[0069] Specifically, the fire bar assembly 200 includes a fire bar gas distribution rod 220 and a plurality of fire bar units 210 arranged side by side. The plurality of fire bar units 210 are all connected to the fire bar gas distribution rod 220, and the fire bar gas distribution rod 220 is connected to the first gas branch 610; the plurality of fire bar units 210 are used to draw the air and gas from the installation room 130 to mix and spray fire into the first combustion chamber 110.

[0070] It can be understood that each fire bar unit 210 can draw the air and gas in the installation room 130 to mix and can spray fire toward the first combustion chamber 110. The fire bar assembly 200 includes multiple fire bar units 210 arranged side by side, which increases the area of ​​the fire bar assembly 200 spraying fire toward the first combustion chamber 110 and ensures the uniformity of the fire spraying, thereby accelerating the preheating effect of the first combustion chamber 110.

[0071] In this embodiment, the fire bar assembly 200 also includes a fire bar gas distribution rod 220 connected to the first gas branch 610. The fire bar gas distribution rod 200 is connected to multiple fire bar units 210, thereby realizing the function of diverting the gas in the first gas branch 610 to each fire bar unit 210.

[0072] Optionally, an air gap 201 is formed between two adjacent fire bar units 210 , and the air gap 201 is connected to the first combustion chamber 110 .

[0073] The first air branch 510 introduces air into the installation chamber 130, which is then guided into the pipes of the fire bar units 210 through the multiple fire bar units 210. The air is mixed with the gas introduced from the first gas branch 610 and ejected from the fire outlets of the fire bar units 210. At this time, the air entering the fire bar units 210 from the installation chamber 130 is equivalent to the primary air participating in the preheating combustion. When the flames are ejected from the fire outlets of the fire bar units 210 for combustion, since the installation chamber 130 is connected to the first combustion chamber 110, the air inside the installation chamber 130 can be replenished with secondary air when the fire outlets of the fire bar units 210 burn, thereby ensuring the adequacy of the preheating combustion. Furthermore, the air in the installation chamber 130 can enter the first combustion chamber 110 along the air gap 201 and enter the second combustion chamber 120 through the first combustion chamber 110 to participate in the high-temperature air combustion reaction in the second combustion chamber 120.

[0074] In this embodiment, a portion of the air introduced from the air introduction member 530 enters the installation chamber 130 from the first air branch 510, and a portion of the air entering the installation chamber 130 is injected into the fire bar unit 210 through the fire bar assembly 200 to form primary air for preheating combustion. At the same time, a portion of the air entering the installation chamber 130 will pass through the air gap 201 formed between adjacent fire bar units 210 and enter the flamethrower of the fire bar assembly 200 to participate in preheating combustion, forming secondary air for preheating combustion and entering the first combustion chamber 110; another portion of the air introduced from the air introduction member 530 enters the air injection assembly 300 from the second air branch 520, and injects air into the second combustion chamber 120, participating in the high-temperature air combustion in the second combustion chamber 120. This embodiment introduces air into the second combustion chamber 120 through different paths. Compared with the case where air is introduced only from the air gap 201 of the fire bar assembly 200, the larger amount of air in the air gap 201 may easily lead to large aerodynamic noise, thereby affecting the sound quality of the gas water heater. This embodiment reduces the aerodynamic noise while ensuring the quality of high-temperature air combustion.

[0075] The present invention also proposes a gas water heater, referring to Figure 1 The gas water heater includes a heat exchanger 700 and a burner. The specific structure of the burner is similar to that of the above-mentioned embodiments. Since this gas water heater adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. The heat exchanger 700 is connected to the second combustion chamber 120 of the burner to produce hot water using the heat generated by the second combustion chamber 120.

[0076] As will be understood, the heat exchanger 700 has a water inlet and a water outlet. The water inlet of the heat exchanger 700 is connected to a tap water pipe, receiving cold water for heat exchange. The water outlet is used to connect to the user's faucet or shower via a pipe. Generally, a cold water connector and a hot connector are provided for convenient connection. In this embodiment, the heat exchanger 700 can be a heat exchange pipe provided on the side wall of the housing 100 corresponding to the position of the second combustion chamber 120, so as to exchange heat with the second combustion chamber 120 and convert the input cold water into hot water. In other embodiments, it can also be a water-cooled wall, which is not limited here.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A burner, characterized in that: Applied to a gas water heater, the burner comprises: a housing, wherein a first combustion chamber and a second combustion chamber are formed in the housing and are connected in sequence; a preheating burner, the preheating burner being disposed in the housing and configured to generate preheating combustion in the first combustion chamber and heat the flue gas in the first combustion chamber to a target temperature; an air injection assembly connected to the second combustion chamber and configured to inject air into the second combustion chamber; and A gas injection assembly is connected to the second combustion chamber and is used to inject gas into the second combustion chamber so that the amount of air and the amount of gas in the second combustion chamber meet the excess air coefficient of the high-temperature air combustion reaction to carry out the high-temperature air combustion reaction.

2. The burner according to claim 1, wherein The burner also includes an air supply assembly, which includes an air inlet and a first air branch and a second air branch connected to the air outlet side of the air inlet, the first air branch is connected to the preheating burner, and the second air branch is connected to the air injection assembly.

3. The burner according to claim 2, characterized in that The air injection assembly includes an air distribution rod connected to the second air branch and multiple air nozzles. One end of the multiple air nozzles is connected to the air distribution rod, and the other end penetrates the side wall of the shell to inject air into the second combustion chamber.

4. The burner according to claim 3, characterized in that The burner also includes a gas supply pipeline, which includes a gas main, a first gas branch and a second gas branch. The first gas branch connects the gas main and the preheating burner, and the second gas branch connects the gas main and the gas injection assembly.

5. The burner according to claim 4, characterized in that The gas injection assembly includes a gas distribution rod connected to the second gas branch and multiple gas nozzles. One end of the multiple gas nozzles is connected to the gas distribution rod, and the other end is penetrated through the side wall of the shell to inject gas into the second combustion chamber.

6. The burner according to claim 5, characterized in that The gas nozzle and the air nozzle are arranged on the same side of the shell.

7. The burner according to claim 6, characterized in that The number of the air nozzles and the number of the gas nozzles located on the same side of the housing are the same.

8. The burner according to claim 6, wherein The plurality of air nozzles located on the same side of the shell are arranged in a row, the plurality of gas nozzles are arranged in a row, and the plurality of air nozzles and the plurality of gas nozzles are arranged side by side.

9. The burner according to claim 8, characterized in that The vertical distance between the air nozzle and the gas nozzle located on the same side of the shell is between 5 mm and 50 mm.

10. The burner according to claim 6, wherein The diameter of the air nozzle is larger than that of the gas nozzle.

11. The burner according to any one of claims 5 to 10, characterized in that The gas distribution rod and the air distribution rod located on the same side of the shell are an integrated structure.

12. The burner according to any one of claims 1 to 10, characterized in that The burner includes two groups of air injection assemblies and two groups of gas injection assemblies. The two groups of air injection assemblies are arranged on opposite sides of the second combustion chamber, and the two groups of gas injection assemblies are arranged on opposite sides of the second combustion chamber. The air injection assemblies and the gas injection assemblies are correspondingly arranged on the same side wall of the second combustion chamber.

13. The burner according to any one of claims 4 to 10, characterized in that The preheating burner is a fire bar assembly. An installation chamber for installing the fire bar assembly is formed in the shell. The installation chamber is connected to the first combustion chamber; the first air branch is connected to the installation chamber.

14. The burner according to claim 13, wherein The fire grate assembly includes a fire grate gas distribution rod and multiple fire grate units arranged side by side. The multiple fire grate units are all connected to the fire grate gas distribution rod, and the fire grate gas distribution rod is connected to the first gas branch; the multiple fire grate units are used to draw air from the installation room and mix with the gas to spray fire into the first combustion chamber.

15. The burner according to claim 14, characterized in that An air gap is formed between two adjacent fire bar units, and the air gap is communicated with the first combustion chamber.

16. A gas water heater, characterized in that: The invention comprises a heat exchanger and the burner according to any one of claims 1 to 15, wherein the heat exchanger is connected to the second combustion chamber of the burner to produce hot water by the heat generated by the second combustion chamber.

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