WO2021244494A1

WO2021244494A1 - Combustor and gas water heater

Info

Publication number: WO2021244494A1
Application number: PCT/CN2021/097445
Authority: WO
Inventors: 梁泽锋; 钱晓林; 曲绍鹤
Original assignee: 芜湖美的厨卫电器制造有限公司; 美的集团股份有限公司
Priority date: 2019-10-17
Filing date: 2021-05-31
Publication date: 2021-12-09
Also published as: CN112682781A; CN112682783A; CN112682780A; WO2021244492A1; CN212618288U; CN112682790B; CN212618287U; CN112682786A; CN212618283U; CN212618286U; CN212618284U; CN112682785A; CN112682792A; WO2021244493A1; CN112682789B; CN112682788A; CN212618285U; CN112682790A; CN213272606U; CN112682787A

Abstract

A combustor (10), comprising a housing (100) and a preheating combustor (200), wherein a premixing chamber (130), an air preheating chamber (140) and a combustion chamber (150) which are in sequential communication are arranged inside the housing (10); the premixing chamber (130) is provided with a gas inlet (131) for being connected with air and gas; the air preheating chamber (140) is provided with an air outlet (141) through which air flows into the air preheating chamber; and the combustion chamber (150) is provided with a flue gas outlet (151) and a gas outlet (152), and the gas outlet (152) is used for injecting gas into the combustion chamber (150), such that a high-temperature air combustion reaction is carried out in the combustion chamber (150); and the preheating combustor (200) is installed in the air preheating chamber (140), and the preheating combustor (200) is used for igniting the mixed gas which is discharged into the air preheating chamber (140) through the premixing chamber (130), and is also used for heating the temperature in the air preheating chamber (140) to a preset temperature. Further disclosed is a gas water heater comprising the combustor (10).

Description

Burner and gas water heater

This application requires the priority of the Chinese patent application filed on May 30, 2020, the application number is 202010487259.9, and the application title is "Burner and Gas Water Heater".

This application claims the priority of the Chinese patent application filed on May 30, 2020, the application number is 202010487258.4, and the application name is "Burner and Gas Water Heater".

This application requires the priority of the Chinese patent application filed on May 30, 2020, with the application number 202010487271.X, and the application titled "Burner and Gas Water Heater".

Technical field

This application relates to the technical field of high-temperature air combustion, in particular to a burner and a gas water heater.

Background technique

High temperature air combustion (high temperature air combustion) is called "mild and deep low-oxygen dilution combustion", or soft combustion for short, is a new type of combustion method, also known as MILD combustion. The main characteristics of the combustion are: chemical reactions mainly occur in a high temperature and low oxygen environment, the temperature of the reactants is higher than its natural temperature, and the maximum temperature rise during the combustion process is lower than its autoignition temperature, and the oxygen volume fraction is diluted to the extreme by the combustion products. Low concentration. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the thickness of the flame becomes thicker, and the front face of the flame disappears, so that the temperature of the entire furnace is very uniform during this combustion, and the pollutant NOx and CO emissions are emitted. Significantly reduced.

Although high-temperature air combustion has the above-mentioned many advantages, at present, there is no professional burner to realize the above-mentioned high-temperature air combustion. In the related art, the pre-mixing chamber is defined in the shell so that the gas and air are mixed in the pre-mixing chamber and then sent to the pre-heating burner for combustion. Therefore, whether the mixed gas in the pre-mixing chamber is evenly mixed determines its combustion in the pre-heating Whether the combustion in the device is complete. Therefore, there is an urgent need for a combustor that can achieve high-temperature air combustion and at the same time complete the combustion of the preheated combustor.

The above content is only used to assist in understanding the technical solution of the application, and does not mean that the above content is recognized as prior art.

Application content

The main purpose of this application is to propose a burner which aims to solve one or more of the technical problems mentioned above.

In order to achieve the above objectives, the burner proposed in this application includes:

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber having a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber; and

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber The temperature is heated to the preset temperature.

Optionally, the housing includes a shell and a first cylinder provided in the shell, and the combustion chamber is defined in the first cylinder;

A gas distribution chamber is defined between the first cylinder and the outer shell, the gas outlet is in communication with the gas distribution chamber, the gas distribution chamber has a gas inlet, and the gas outlets are multiple, and there are multiple outlets. The gas outlets are opened on the peripheral wall surface of the first cylinder, and are arranged at intervals along the circumferential direction of the first cylinder.

Optionally, the housing further includes a second cylinder provided in the housing, the second cylinder defines the air preheating chamber and the premixing chamber, the second cylinder and the An air distribution chamber is defined between the casings, the air distribution chamber has an air inlet, the air outlets are multiple, and the multiple air outlets are opened on the peripheral wall surface of the second cylinder and run along the The second cylinder is arranged at intervals in the circumferential direction.

Optionally, the premixing chamber, the air preheating chamber, and the combustion chamber are arranged in sequence from bottom to top, the gas outlet is provided at the upper end of the first cylinder, and the gas flow of the gas outlet Set the direction downward or obliquely downward.

Optionally, the combustor further includes a flow turbulence device installed in the premixing chamber and arranged so that a spiral passage is formed in the premixing chamber, and the inlet of the spiral passage and the air inlet are Connected, the outlet of the spiral channel is in communication with the air preheating chamber.

Optionally, the turbulence device includes a central retaining ring and a spiral blade, the inner end of the spiral blade is connected to the central retaining ring, and the outer end of the spiral blade is connected to the inner wall surface of the premixing chamber, It is arranged such that the spiral passage is defined between the spiral blade, the central retaining ring and the housing.

Optionally, the helix angle of the spiral blade is greater than or equal to 10 degrees and less than or equal to 45 degrees.

Optionally, the ratio of the extension height of the premixing chamber to the extension height of the spiral blade is greater than or equal to 1.2 and less than or equal to 2.

Optionally, the ratio of the inner diameter of the premixing chamber to the outer diameter of the central retaining ring is greater than or equal to 1.5 and less than or equal to 4.

Optionally, the bottom of the central retaining ring and the bottom wall surface of the premixing chamber are spaced apart.

In addition, in order to achieve the above object, the present application also provides a gas water heater, including a main body, a heat exchanger, and a burner. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber. The heat exchanger is arranged in the heat exchange chamber, the flue gas outlet of the burner is in communication with the heat exchange chamber, and the burner includes:

In addition, in order to achieve the above objective, the present application also provides a burner, including:

A casing, the casing is formed with an air preheating chamber and a combustion chamber communicating with each other, the air preheating chamber has a flue gas inlet and a plurality of swirling air outlets spaced apart along the circumference of the air preheating chamber , The swirl air outlet is configured to input air into the air preheating chamber, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that all The high-temperature air combustion reaction in the combustion chamber;

A preheating burner is provided corresponding to the flue gas inlet, and the preheating burner is configured to ignite the pre-mixed gas and air mixture and discharge it into the air preheating chamber through the flue gas inlet, and Heating the temperature in the air preheating room to a preset temperature;

Wherein, the swirling directions of the air flows blown from the plurality of swirl air outlets are the same, and are arranged so that the air flows blown from the swirl air outlets form a swirl in the air preheating chamber.

Optionally, the combustor further includes a diversion device, the diversion device is provided on the wall surface of the air preheating chamber, and is in communication with the swirl air outlet, and is configured to guide the airflow of the swirl air outlet Blow out around the circumference of the air preheating chamber.

Optionally, the flow guiding device includes a flow guiding plate which is arranged on the side edge of the swirling air outlet extending in the axial direction of the air preheating chamber, and extends from the inner wall surface of the air preheating chamber. It is arranged obliquely toward the swirling air outlet.

Optionally, the guide plate is fixedly connected to the inner wall surface of the air preheating chamber, or the guide plate is rotatably connected to the inner wall surface of the air preheating chamber, and is configured to adjust the swirling flow The size of the opening of the air outlet.

Optionally, the air preheating chamber further has a swirling air inlet corresponding to the swirling air outlet, and a swirling passage is formed between each of the swirling air inlet and the corresponding swirling air outlet , The wind passing area of the swirling air outlet is smaller than the wind passing area of the swirling air inlet.

Optionally, the inner diameter of the swirling channel gradually decreases from the swirling air inlet to the swirling air outlet.

Optionally, the angle between the outlet direction of the swirling air outlet and the wall surface of the air preheating chamber is greater than or equal to 0 degrees and less than or equal to 45 degrees.

Optionally, the housing is further formed with a premixing chamber, the premixing chamber, the air preheating chamber, and the combustion chamber are connected in sequence, and the preheating burner is provided in the air preheating chamber, The premixing chamber has air inlets for access to air and gas, and the burner further includes a flow turbulence device installed in the premixing chamber, and the turbulence device is configured to turb the air and gas flow, The mixed gas blown out by the turbulence device is a swirling airflow.

Optionally, the swirling direction of the mixed gas blown out by the turbulence device is consistent with the swirling direction of the air flow blown out by the swirling air outlet; or,

The swirling direction of the mixed gas blown out by the turbulence device is opposite to the swirling direction of the air flow blown out by the swirling air outlet.

In addition, in order to achieve the above object, the present application also provides a gas water heater including a main body, a heat exchanger, and a burner. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber. The heat exchanger is arranged in the heat exchange chamber, the flue gas outlet of the burner is in communication with the heat exchange chamber, and the burner includes:

A casing, the casing is formed with an air preheating chamber and a combustion chamber communicating with each other, the air preheating chamber has a flue gas inlet and a plurality of swirling air outlets spaced apart along the circumference of the air preheating chamber The swirl air outlet is configured to input air into the air preheating chamber, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that the High-temperature air combustion reaction in the combustion chamber;

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber;

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber Heated to a preset temperature; and

A flow turbulence device, the flow turbulence device is rotatably provided in the premixing chamber, and is configured to turb the flow of gas and air entering the premixing chamber.

Optionally, the spoiler device includes a spoiler, a rotating shaft, and a bearing sleeved on the rotating shaft, and the spoiler is rotatably mounted on the shell through the rotating shaft and the bearing. The spoiler is located between the air inlet and the preheating burner.

Optionally, the bearing is installed on the housing, one end of the rotating shaft is connected to the bearing, and the other end is fixedly connected to the spoiler.

Optionally, the air inlet is opened on the peripheral wall of the premixing chamber.

Optionally, the spoiler device includes a spoiler and a rotating shaft connected to the spoiler, and the burner further includes a driving device that is connected to the rotating shaft and is configured to drive The spoiler rotates.

Optionally, the spoiler includes a disc-shaped body; or, the spoiler includes a plurality of blades arranged at intervals along the circumference of the premixing chamber.

Optionally, the disc-shaped body is gradually arranged toward the side close to the preheating burner.

Optionally, the disc-shaped body includes a plurality of concave portions and a plurality of convex portions arranged at intervals along the circumferential direction thereof, and a concave portion is connected between two adjacent convex portions.

Optionally, the disc-shaped body is provided with a plurality of spoiler holes, and the plurality of spoiler holes are arranged at intervals along the circumferential direction of the disc-shaped body.

Optionally, the disc-shaped body and the inner wall surface of the housing are arranged at intervals, and the inner wall surface of the housing is further provided with a baffle ring, and the protrusion height of the baffle ring is greater than or equal to the disc-shaped body. The distance between the body and the inner wall surface of the shell is, in the air outlet direction of the premixing chamber, the baffle ring is located downstream of the disc-shaped body.

The burner of the present application is provided with a pre-mixing chamber, air pre-heating chamber and combustion chamber which are connected in sequence in the shell, and the pre-heating burner ignites and burns the mixed gas to achieve high-temperature pre-heating of air, and then passes through the gas outlet on the combustion chamber. The combination of fuel gas injection produces an entrainment effect, which causes high-temperature flue gas to flow back. On the one hand, it achieves heat preservation and enables spontaneous combustion of the gas in the combustion chamber. On the other hand, it dilutes the air so that the oxygen concentration is lower than a certain value to achieve uniform combustion. High-temperature air combustion occurs indoors. This application realizes a concrete and feasible combustor with high-temperature air combustion function. In addition, the structure of this burner frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is used in gas water heaters and Including gas wall-hung boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, they not only meet the requirements, but also bring sufficient and low combustion that the burners of existing water heaters do not have. The effect of pollutant discharge. In addition, gas injection can be realized only by opening a gas outlet on the combustion chamber, the structure is simple and easy to realize, and the structure of the entire combustor is more compact and the volume is smaller.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

Figure 1 is a schematic structural diagram of an embodiment of a combustor according to the present application;

Fig. 2 is an enlarged schematic diagram of S in Fig. 1;

Fig. 3 is a schematic top view of the structure of the combustor in Fig. 1;

4 is a schematic cross-sectional view of the first embodiment along A-A in FIG. 3;

Fig. 5 is a schematic sectional view of the first embodiment along B-B in Fig. 3;

Fig. 6 is a schematic sectional view of the structure taken along C-C in Fig. 5;

Fig. 7 is a schematic sectional view of the second embodiment along A-A in Fig. 3;

8 is a schematic sectional view of the second embodiment along B-B in FIG. 3;

Fig. 9 is a schematic sectional view of the structure along D-D in Fig. 8;

Figure 10 is a partial enlarged view at E in Figure 9, where the preheating burner is removed;

FIG. 11 is a partial structural diagram of an embodiment of the second cylinder of the combustor of the present application;

Fig. 12 is a schematic structural view of the second cylinder in Fig. 11 from another angle;

Figure 13 is a schematic sectional view of the structure taken along F-F in Figure 12;

14 is a schematic cross-sectional view of the third embodiment along A-A in FIG. 3;

15 is a schematic sectional view of the third embodiment along B-B in FIG. 3;

Fig. 16 is a schematic sectional view of the structure along G-G in Fig. 15;

Fig. 17 is a schematic structural diagram of an embodiment of the disc-shaped body of the burner of the present application.

Attached icon number description:

标号Label	名称name	标号Label	名称 name	标号Label		名称name
1010	燃烧器 burner	142142	烟气进口 Flue gas inlet	190190	第二筒体 Second cylinder
100100	壳体 case	143143	旋流空气出口 Swirl air outlet	200200	预热燃烧器 Preheat burner
110110	空气分配室 Air distribution room	144144	旋流空气进口 Swirl air inlet	300300	扰流装置 Spoiler
111111	空气进口 Air inlet	145145	旋流通道 Swirl channel	310310	中心挡圈 Center retaining ring
120120	燃气分配室 Gas distribution room	150150	燃烧室 Combustion chamber	320320	螺旋叶片 Spiral blade
121121	燃气进口 Gas inlet	151151	烟气出口 Flue gas outlet	330330	盘状体 Discoid
130130	预混室 Premix room	152152	燃气出口 Gas outlet	331331	凹部 Recess
131131	进气口 Air inlet	161161	挡环 Retaining ring	332332	凸部Convex
132132	螺旋通道 Spiral channel	162162	引流板 Drainage plate	333333	扰流孔 Spoiler
140140	空气预热室 Air preheating room	170170	外壳 shell	340340	转动轴Axis of rotation
141141	空气出口 Air outlet	180180	第一筒体 First cylinder	350350	轴承Bearing

The realization, functional characteristics, and advantages of the purpose of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The purpose of this application is to use the characteristics of high-temperature air combustion to design a new type of burner and apply it to a gas water heater, so that the gas water heater can effectively reduce CO and NOx emissions and reduce the noise of the gas water heater.

This application proposes a burner, which is suitable for gas water heaters and related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, including gas wall-hung boilers. The following is for ease of understanding, and it is applied to gas water heaters as an example .

In the embodiment of the present application, as shown in FIGS. 1 to 5, as shown, the burner 10 includes a casing 100 and a preheating burner 200. The housing 100 is formed with a premixing chamber 130, an air preheating chamber 140, and a combustion chamber 150 that are connected in sequence. The premixing chamber 130 has an air inlet 131 for connecting air and gas, and the air preheating chamber 140 has air flowing into it. The air outlet 141. The combustion chamber 150 has a flue gas outlet 151 and a gas outlet 152. The gas outlet 152 is used to inject gas into the combustion chamber 150 so as to cause a high-temperature air combustion reaction in the combustion chamber 150. The preheating burner 200 is installed in the air preheating chamber 140. The preheating burner 200 is used to ignite the mixed gas discharged from the premixing chamber 130 into the air preheating chamber 140 and to adjust the temperature in the air preheating chamber 140 Heat to preset temperature.

The main characteristics of high-temperature air combustion are: chemical reactions mainly occur in a high-temperature and low-oxygen environment, the temperature of the reactants is higher than its natural temperature, and the maximum temperature rise during the combustion process is lower than its natural temperature, and the oxygen volume fraction is diluted by the combustion products to Very low concentration. Compared with conventional combustion, in this combustion state, the pyrolysis of the fuel is suppressed, the thickness of the flame becomes thicker, and the front face of the flame disappears, so that the temperature in the entire furnace is very uniform, the combustion peak temperature is low, and the noise is extremely low, and The pollutant NOx and CO emissions are greatly reduced. However, to achieve high-temperature air combustion requires certain conditions: it is necessary to ensure that the oxygen concentration at any position in the furnace is below a certain value, generally less than 5% to 10%, to ensure that the gas is fully combusted and burned uniformly, and the temperature must be higher than The spontaneous ignition point of the fuel to maintain spontaneous combustion.

In this embodiment, the cross-sectional shape of the housing 100 can be rectangular, circular, elliptical, special-shaped, etc., which can be selected and designed according to actual needs, and is not specifically limited here. The premixing chamber 130, the air preheating chamber 140 and the combustion chamber 150 can be arranged in a straight line (the air passage is a straight line), or they can be arranged in a turning line (the air passage is a broken line), It can also be surrounded by layers (the air flow is blown from the inside to the outside or from the outside to the inside). Of course, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 can also be arranged in a linear and enclosed manner. It only needs to make the premixing chamber 130, the air preheating chamber 140 and the combustion chamber 150 communicate in sequence, which is not specifically limited here. The cross-sectional shape of the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 can be round, oval, ring, rectangular, etc., and can be selected according to the actual shape of the housing 100 and the arrangement of the three. design.

In order to make the combustion more complete, the gas entering from the air inlet 131 is a mixed gas of fuel gas and air mixed through the premixer. The external air first enters the air distribution chamber 110 of the housing 100, and then enters the air preheating chamber 140 from the air outlet 141. The air flow can be blown into the air distribution chamber 110 through a fan or other devices, and then passes through the air outlet 141 to be relatively uniform Enter the air preheating chamber 140. It should be noted that the air outlet 141 is provided at the air outlet end of the preheating burner 200. That is, when the mixed gas in the premixing chamber 130 is burned by the preheating burner 200, the high-temperature flue gas enters the air preheating chamber 140, and at the same time, enters the air from the air outlet 141 to the air preheating chamber 140, so that the cold air and The high-temperature flue gas in the air preheating chamber 140 is mixed to heat the cold air. The heated air and high-temperature flue gas enter the combustion chamber 150 to heat the combustion chamber 150. In order to fully and uniformly mix the air with the high-temperature flue gas generated during combustion in the air preheating chamber 140, there may be multiple air outlets 141, and the multiple air outlets 141 are arranged at intervals around the circumference of the air preheating chamber 140 Wall setting. The multiple air outlets 141 can comb the air into multiple uniform airflows, so that when the air is mixed with the high-temperature flue gas combusted in the air preheating chamber 140, it is more fully and uniformly mixed. In order to further agitate the cold air and high-temperature flue gas in the air preheating chamber 140, a stirring device can be provided in the air preheating chamber 140 to fully agitate and mix the cold air and high-temperature flue gas, so that the air is quickly and evenly heated to the preheating temperature. Set temperature.

The gas in the gas distribution chamber 120 can be controlled by an external gas valve. It can be understood that, because the gas valve has a certain air pressure when the gas valve is opened, the gas in the gas distribution chamber 120 can be injected into the combustion chamber 150 from the gas outlet 152. The gas outlet 152 may specifically be an opening opened on the wall of the casing 100, or may be a gas nozzle or an air flow outlet of a gas nozzle, so that high-speed jets of gas are realized when the gas is ejected from the gas outlet 152 of the gas injection device. The high-speed injected gas forms an entrainment effect in the combustion chamber 150, so that an injection burner and a flue gas recirculation zone are formed in the combustion chamber 150, and the high-temperature flue gas in the combustion chamber 150 circulates quickly and intensively in the combustion chamber 150 , And then fully dilute the injected fuel gas and the incoming air to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain a higher temperature in the combustion chamber 150, keeping the temperature higher than the fuel's spontaneous ignition point to achieve spontaneous combustion. In this way, this embodiment satisfies the conditions of high-temperature air combustion (MILD combustion): high-temperature preheated air and high-speed jets are used to entrain high-temperature flue gas and dilute and ignite the air jets, so that the oxygen concentration is lower than a certain value and the temperature is higher than the fuel The spontaneous ignition point.

The preheating burner 200 may specifically be a fully premixed burner. The preheating burner 200 can be installed in the air preheating chamber 140 or at the gas flow ports of the premixing chamber 130 and the air preheating chamber 140. The preheating burner 200 is used to discharge the premixing chamber 130 into the air. The mixed gas in the preheating chamber 140 is ignited. Specifically, the combustor 10 further includes an ignition device disposed in the casing 100 adjacent to the preheating burner 200, and the ignition device is used to ignite the preheating burner 200. In order to make the combustion uniform, the preheating burner 200 includes a plate-shaped body and a plurality of vent holes arranged through the thickness of the plate-shaped body. The multiple vent holes are used for the mixed gas to pass through and enter the air preheating chamber 140. A plurality of air passage holes can be arranged uniformly or staggered on the plate-shaped body to ensure uniform combustion. The ignition device can specifically be an electronic igniter or an electric heating wire, so that the power consumption is smaller.

When the combustor 10 is working, the mixed gas is transported from the air inlet 131 into the spiral passage 132 of the premixing chamber 130, and the gas and air are mixed uniformly in the spiral passage 132 and then sent to the preheating burner 200, which is controlled by the ignition device. The preheating burner 200 is ignited. After the mixed gas is burned, the high-temperature flue gas enters the air preheating chamber 140, while the air enters the air preheating chamber 140 from the air distribution chamber 110 through the air outlet 141, and the high-temperature flue gas is mixed with cold air , To heat the cold air. It can be understood that by controlling the heating temperature, the air in the air preheating chamber 140 can be heated to the target temperature, that is, the aforementioned preset temperature, so that high-temperature preheating of the air is realized. Specifically, the combustor 10 further includes a temperature measuring device, and the temperature measuring device is arranged in the air preheating chamber 140. The temperature measuring device is used to detect whether the gas temperature in the air preheating chamber 140 reaches the target temperature. If it does not reach the target temperature, the temperature in the air preheating chamber 140 needs to be increased, and the air intake volume can be controlled or controlled. The ratio of gas and air in the mixing chamber 130 realizes temperature adjustment. By detecting the temperature, the preheating burner 200 can automatically adjust the thermal load according to the air volume required for the combustion of the MILD to achieve the effect of quickly preheating the air, while ensuring low CO and NOX emissions during the entire combustion process. The temperature measuring device may be a temperature sensor. After the high-temperature preheated air and high-temperature flue gas are delivered to the combustion chamber 150, the gas outlet 152 is controlled to inject gas, the gas contacts the high-temperature gas, and the high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. The burned heat is discharged through the flue gas outlet 151, and can exchange heat with the heat exchanger of the gas water heater to realize the production of hot water.

In the embodiment of the present application, the pre-mixing chamber 130, the air pre-heating chamber 140, and the combustion chamber 150 are arranged in the casing 100 in sequence, and the pre-heating burner 200 ignites and combusts the mixed gas to achieve high-temperature pre-heating of air. , And then inject gas through the gas outlet 152 to cooperate to produce an entrainment effect, so that the high-temperature flue gas can flow back. On the one hand, heat preservation makes the temperature higher than the spontaneous ignition point of the fuel, so that the gas in the combustion chamber can ignite spontaneously, and on the other hand, the dilution air is entrained by the jet , The oxygen concentration is lower than a certain value to achieve uniform combustion, so that high-temperature air combustion occurs in the combustion chamber 150. That is to say, the technical solution of this embodiment is beneficial for achieving these two conditions at the same time, and smoothly achieving high-temperature air combustion. In addition, the structure of this burner frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is used in gas water heaters and Including gas wall-hung boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, they not only meet the requirements, but also bring sufficient and low combustion that the burners of existing water heaters do not have. The effect of pollutant discharge. In addition, the fuel gas can be injected only by opening the fuel gas outlet 152 on the combustion chamber 150, the structure is simple and easy to implement, and the entire combustor 10 has a more compact structure and a smaller volume.

In the above embodiment, in order to better obtain the mixed gas of gas and air, the premixer includes a casing, a fan, and a gas switch valve. The casing is formed with an air inlet duct, a gas flow channel, and a mixing channel. The air duct and the gas flow channel are respectively connected, the fan is arranged in the air inlet duct, the gas switch valve is arranged in the gas flow channel, and the mixing channel is connected with the air inlet 131 of the mixed gas distribution chamber. When the mixed gas is needed, the fan is controlled to work and the gas switch valve is controlled to open according to the preset air intake and gas ratio to mix in the casing to obtain a mixed gas with a certain gas/air ratio.

In one embodiment, referring to FIGS. 4 and 5, the housing 100 includes a housing 170 and a first cylinder 180 disposed in the housing 170. The first cylinder 180 defines a combustion chamber 150, and the first cylinder 180 A gas distribution chamber 120 is defined between the gas distribution chamber 120 and the casing 170. The gas distribution chamber 120 has a gas inlet 121, and there are multiple gas outlets 152. 180 circumferential interval settings.

In this embodiment, the casing 170 can have many shapes. In order to maintain the overall consistency and make the overall structure of the combustor 10 more compact, the casing 170 can be arranged in a cylindrical shape as a whole. The gas inlet 121 is connected with a gas inlet pipe, and the gas inlet pipe is connected with a gas source to input gas. A plurality of gas outlets 152 are opened on the peripheral wall surface of the first cylinder 180, so that the gas can be injected from the gas distribution chamber 120 into the combustion chamber 150 through the gas outlet 152, which satisfies the high-speed gas jet condition. In addition, the multiple gas injection ports make the gas mixture in the combustion chamber 150 more uniform, so that the combustion is slower and more complete. The gas outlet 152 may be opened at the upper end of the first cylinder 180, and the outflow direction corresponding to the gas outlet 152 may be downward, or if the gas outlet 152 is opened at the lower end of the first cylinder 180, the outflow corresponding to the gas outlet 152 The direction can be up.

Further, the housing 100 further includes a second cylinder 190 arranged in the housing 170, the second cylinder 190 defines an air preheating chamber 140 and a premixing chamber 130, and defines between the second cylinder 190 and the housing 170 Out of the air distribution chamber 110, the air distribution chamber 110 has an air inlet 111, and multiple air outlets 141. The multiple air outlets 141 are opened on the peripheral wall of the second cylinder 190 and are arranged at intervals along the circumference of the second cylinder 190 . An air intake pipe is connected to the air inlet 111, and the air intake pipe is connected to an air source, and air can be input through a fan or the like. Only by arranging the first cylinder 180 and the second cylinder 190 in the housing 170, the gas distribution chamber 120, the air distribution chamber 110, the air preheating chamber 140, the combustion chamber 150 and the premixing chamber 130 can be respectively defined. The overall structure is simple and the design is ingenious, so that the entire burner 10 has a small volume, a small footprint, and a beautiful appearance.

On the basis of the foregoing embodiment, further, as shown in FIGS. 4 and 5, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are arranged in sequence from bottom to top, and the gas outlet 152 is provided in the first cylinder The upper end of 180, and the airflow direction of the gas outlet 152 is set downward or inclined downward. In this way, the air intake direction of the entire combustor 10 is from bottom to top, which conforms to the air flow characteristics, and makes the air flow more smooth. The first cylinder 180 is located above the second cylinder 190, and the outer shell 170 surrounds the first cylinder 180 and the second cylinder 190 to maintain the overall consistency of the appearance, and the layout is more compact and reasonable. The gas outlet 152 is arranged at the upper end of the first cylinder 180, and the airflow of the gas outlet 152 is arranged downward or obliquely downward, so that the gas is sprayed downward from the gas outlet 152, forming an entrainment effect in the combustion chamber 150, Makes the gas mixing more uniform, and the combustion is slower and fuller.

Specifically, as shown in FIGS. 1, 4, and 5, the upper end of the first cylinder 180 is tapered from bottom to top. In this way, the upper end of the first cylinder 180 is arranged with a necking from bottom to top. When the gas outlet 152 is arranged at the upper end of the first cylinder 180, the gas outlet 152 is arranged obliquely downward, and the plurality of circumferentially spaced gas outlets 152 all inject gas obliquely downward toward the middle of the air preheating chamber 140, Thereby, the gas mixing in the combustion chamber 150 can be made more uniform, and the combustion can be slower and fuller.

In one embodiment, referring to FIGS. 4 to 6, the combustor 10 further includes a spoiler device 300, which is installed in the premixing chamber 130, so that a spiral channel 132 is formed in the premixing chamber 130, and the spiral channel 132 is formed in the premixing chamber 130. The inlet of the spiral channel 132 communicates with the air inlet 131, and the outlet of the spiral channel 132 communicates with the air preheating chamber 140.

In this embodiment, the turbulence device 300 may include a spiral blade 320 that spirally extends along the axial direction of the premixing chamber 130 such that the spiral blade 320 and the inner wall surface of the premixing chamber 130 enclose a spiral channel 132. In an embodiment, the spoiler 300 includes a spiral coil, and a spiral channel 132 is formed in the spiral coil. By forming the spiral channel 132 in the spiral coil, the structure is simple and easy to realize. It should be noted that the spiral channel 132 means that the channel extends in a spiral shape, and when the air flows through the spiral channel 132, the flow path of the air flow is also spiral. By installing the spoiler device 300 in the premixing chamber 130 to form the spiral channel 132, compared with the premixing chamber 130 without the spoiler device 300, the air flow path is longer and the air flow is in the spiral channel. Rotation is generated within 132. Therefore, when the gas and air enter the spiral channel 132 from the air inlet 131, they are fully and uniformly mixed in the spiral channel 132, and then transported from the outlet of the spiral channel 132 to the preheating burner 200 for combustion, which makes the combustion more Full, low pollutant emissions during the combustion process and low noise.

In one embodiment, referring to Figures 4 to 6, the spoiler device 300 includes a central retaining ring 310 and a spiral blade 320. The inner end of the spiral blade 320 is connected to the central retaining ring 310, and the outer end of the spiral blade 320 is connected to the pre- The inner wall surface of the mixing chamber 130 defines a spiral passage 132 between the spiral blade 320, the central retaining ring 310 and the housing 100.

In this embodiment, it can be understood that the central retaining ring 310 has a columnar structure and a closed structure, which can prevent the mixed air flow from entering the central retaining ring 310 and affecting the mixing effect of gas and air. The central retaining ring 310 is arranged in the middle of the premixing chamber, and the extending direction of the central retaining ring 310 is consistent with the extending direction of the premixing chamber 130. The spiral blade 320 extends along the axis of the central retaining ring 310, that is, the spiral blade 320 extends along the axis of the premixing chamber 130. The spiral blade 320 can be fixedly connected with the central retaining ring 310 and the housing 100 by welding or integral molding. By making the inner end of the spiral blade 320 connected to the central retaining ring 310 and the outer end connected to the inner wall surface of the housing 100, the spiral blade 320, the outer wall surface of the central retaining ring 310 and the inner wall surface of the premixing chamber 130 are defined between出Spiral passage 132. Through the structure of the spiral blade 320 and the central retaining ring 310, while the spiral channel 132 is formed in the premixing chamber 130, the structure is simple and easy to manufacture. Compared with the spiral channel 132 formed in the spiral coil, the premixing chamber can be fully utilized The space inside 130 can thereby maximize the air passing area of the spiral channel 132, and effectively improve the gas mixing rate and flow rate of the premixing chamber 130.

Based on the foregoing embodiment, further, as shown in FIGS. 4 and 5, the helix angle of the spiral blade 320 is greater than or equal to 10 degrees and less than or equal to 45 degrees. Specifically, the helix angle of the spiral blade 320 may be 10 degrees, 15 degrees, 18 degrees, 20 degrees, 25 degrees, 27 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, and so on. If the helix angle of the spiral blade 320 is less than 10 degrees, the path of the spiral channel 132 is too long, the air flow loss is large, and the time for a single mixed gas delivery becomes longer, and the gas flow rate of the premixing chamber 130 becomes low. As a result, the mixed gas in the premixing chamber 130 cannot meet the usage requirements. When the spiral angle of the spiral blade 320 is greater than 45 degrees, the path of the spiral passage 132 is too short, so that the gas and air cannot be mixed sufficiently after entering the spiral passage 132. When the helix angle of the spiral blade 320 is greater than or equal to 10 degrees and less than or equal to 45 degrees, the gas flow rate of the premixing chamber 130 is increased under the premise that the gas and air can be fully mixed, and the air flow loss is reduced.

In the above-mentioned embodiment in which the spoiler device 300 includes the spiral blade 320, further, the ratio of the extension height of the premixing chamber 130 to the extension height of the spiral blade 320 is greater than or equal to 1.2 and less than or equal to 2. Specifically, the ratio of the extension height of the premixing chamber 130 to the extension height of the spiral blade 320 may be 1.2, 1.3, 1.5, 1.8, 2, etc.

It should be noted that the extension height of the spiral blade 320 refers to the height of the entire spiral blade 320, that is, the height from the bottom end to the top end of the spiral blade 320 in the axial direction of the spiral blade 320. The extension height of the premixing chamber 130 refers to the height of the premixing chamber 130 in the direction of its axis. When the ratio of the extension height of the premixing chamber 130 to the extension height of the spiral blade 320 is less than 1.2, the spiral blade 320 is too long, filling the entire premixing chamber 130, or extending out of the premixing chamber 130, so that the exit from the spiral channel 132 The output mixed airflow does not have enough space for buffering, and directly enters the preheating burner 200 for combustion. Since the air passage area at the outlet of the spiral channel 132 is relatively small, the mixed airflow cannot cover the entire preheating combustion. The device 200 can not achieve the best combustion effect. When the ratio of the extension height of the premixing chamber 130 to the extension height of the spiral blade 320 is greater than or equal to 2, the entire spiral blade 320 in the premixing chamber 130 occupies relatively small, and the length of the spiral passage 132 is relatively short, thereby Can not achieve the effect of fully mixing gas and air. By making the ratio of the extension height of the premixing chamber 130 to the extension height of the spiral blade 320 greater than or equal to 1.2 and less than or equal to 2, while the gas and air can be fully mixed in the spiral channel 132, the spiral channel 132 The mixed air flow blown from the outlet has enough space in the pre-mixing chamber 130 for buffering, and the mixed gas sent from the pre-mixing chamber 130 to the pre-heating burner 200 can cover the entire pre-heating burner 200, thereby making the pre-heating combustion The device 200 achieves the best combustion effect.

In one embodiment, referring to FIG. 6, the ratio of the equivalent inner diameter of the premixing chamber 130 to the equivalent outer diameter of the center retaining ring 310 is greater than or equal to 1.5 and less than or equal to 4. Specifically, the ratio of the equivalent inner diameter of the premixing chamber 130 to the equivalent outer diameter of the central retaining ring 310 may be 1.5, 1.8, 2, 2.5, 3, 3.5, 4, etc.

It can be understood that when the cross-sectional shape of the premixing chamber 130 is a polygon, such as a rectangle, the equivalent inner diameter of the premixing chamber 130 is the diameter of the inscribed circle of the polygon. When the cross-sectional shape of the premixing chamber 130 is an ellipse, the equivalent inner diameter of the premixing chamber 130 is the length of the minor axis of the ellipse. When the cross-sectional shape of the premixing chamber 130 is a circle, the equivalent inner diameter of the premixing chamber 130 is the diameter of the circle. The cross-sectional shape of the center retaining ring 310 may be a circle, a rectangle, an ellipse, or the like. When the cross-sectional shape of the center retaining ring 310 is a circle, the equivalent outer diameter of the center retaining ring 310 is the diameter of the circle. When the cross-sectional shape of the center retaining ring 310 is an ellipse, the equivalent outer diameter of the center retaining ring 310 is the length of the major axis of the ellipse. When the cross-sectional shape of the central retaining ring 310 is a polygon, such as a rectangle, the equivalent outer diameter of the central retaining ring 310 is the diameter of the circumscribed circle of the polygon. For ease of understanding, the cross-sectional shape of the premixing chamber 130 and the cross-sectional shape of the center retaining ring 310 are both circular for detailed description below.

When the ratio of the equivalent inner diameter of the premixing chamber 130 to the equivalent outer diameter of the central retaining ring 310 is less than 1.5, the diameter of the central retaining ring 310 is too large, so that the inner diameter of the spiral passage is too small, and the mixed gas is transported in a single pass. When the amount becomes smaller, the gas flow rate of the premixing chamber 130 becomes lower, so that the mixed gas of the premixing chamber 130 cannot meet the usage requirements. When the ratio of the equivalent inner diameter of the premixing chamber 130 to the equivalent outer diameter of the central retaining ring 310 is greater than 4, the diameter of the central retaining ring 310 is too small, and the overall area and weight of the spiral blade 320 are large, so the central retaining ring The strength of the ring 310 is small, and it is not enough to support the connecting spiral blade 320, so that when the mixed air flows through the spiral channel 132, the central retaining ring 310 will sway, thereby generating noise, or causing a gap between the spiral blade 320 and the central retaining ring 310. The connection is broken. By making the ratio of the equivalent inner diameter of the premixing chamber 130 to the equivalent outer diameter of the central retaining ring 310 greater than or equal to 1.5 and less than or equal to 4, the gas flow rate and the amount of mixed gas in the premixing chamber 130 can meet While using the requirements, the stability of the connection between the spiral blade 320 and the central retaining ring 310 is ensured, and the noise is effectively reduced.

Furthermore, as shown in FIGS. 4 and 5, the bottom of the center retaining ring 310 and the bottom wall surface of the premixing chamber 130 are spaced apart. By making the bottom of the central retaining ring 310 and the bottom wall surface of the premixing chamber 130 spaced apart, the central retaining ring 310 is suspended and fixed on the housing 100 by the spiral blade 320. In this way, when the mixed air flows through the spiral channel 132, the vibration of the center retaining ring 310 can be prevented from being transmitted to the bottom wall surface of the premixing chamber 130, thereby effectively reducing noise.

In addition, this application proposes a burner, which is suitable for gas water heaters and related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, including gas wall-hung boilers. The following is for ease of understanding and is applied to gas water heaters. Take for example.

In the embodiment of the present application, as shown in FIGS. 1 to 13, the combustor 10 includes a casing 100 and a preheating combustor 200. The casing 100 is formed with an air preheating chamber 140 and a combustion chamber 150 that communicate with each other. The air preheating chamber 140 has a flue gas inlet 142 and a plurality of swirling air outlets 143 arranged at intervals along the circumference of the air preheating chamber 140. The swirling air outlets 143 are used to input air into the air preheating chamber 140, . The combustion chamber 150 has a flue gas outlet 151 and a gas outlet 152. The gas outlet 152 is used to inject gas into the combustion chamber 150 so as to cause high-temperature air combustion reactions in the combustion chamber 150. The preheating burner 200 is arranged corresponding to the flue gas inlet 142. The preheating burner 200 is used to ignite the pre-mixed gas and air mixture and discharge it into the air preheating chamber 140 from the flue gas inlet 142, and to The temperature in the air preheating chamber 140 is heated to a preset temperature. Wherein, the swirl directions of the air flows blown by the multiple swirl air outlets 143 are the same, so that the air flows blown from the swirl air outlets 143 form a swirl in the air preheating chamber 140.

In this embodiment, the cross-sectional shape of the housing 100 can be rectangular, circular, elliptical, special-shaped, etc., which can be selected and designed according to actual needs, and is not specifically limited here. The flue gas inlet 142 of the air preheating chamber 140 is used to input the high temperature flue gas burned by the preheating burner 200. The external air first enters the air distribution chamber 110 of the housing 100, and then enters the air preheating chamber 140 from the swirl air outlet 143, and the air flow can be blown into the air distribution chamber 110 through a fan or other device, and then passes through the swirl air outlet 143 enters the air preheating chamber 140 relatively uniformly. It should be noted that the swirl air outlet 143 is provided at the air outlet end of the preheating burner 200. That is, when the mixed gas of fuel gas and air is burned by the preheating burner 200, the high-temperature flue gas enters the air preheating chamber 140, and at the same time, enters the air from the swirling air outlet 143 to the air preheating chamber 140, so that the cold air It is mixed with the high-temperature flue gas in the air preheating chamber 140 to heat the cold air. The heated air and high-temperature flue gas enter the combustion chamber 150 to heat the combustion chamber 150.

The preheating burner 200 may specifically be a fully premixed burner. The preheating burner 200 is arranged corresponding to the flue gas inlet 142, and the preheating burner 200 can be installed in the air preheating chamber 140 or at the flue gas inlet 142 of the air preheating chamber 140. When the housing 100 also defines a pre-mixing chamber 130 communicating with the air pre-heating chamber 140 through the flue gas inlet 142, the pre-heating burner 200 can be installed at the gas flow ports of the air pre-heating chamber 140 and the pre-mixing chamber 130 , So that the mixed gas of a certain proportion of mixed gas and air enters the preheating combustor 200 through the premixing chamber 130 for combustion. The preheating burner 200 is used to ignite the premixed mixed gas of gas and air, and make the ignited high-temperature flue gas enter the air preheating chamber 140 through the flue gas inlet 142. Specifically, the combustor 10 further includes an ignition device disposed in the casing 100 adjacent to the preheating burner 200, and the ignition device is used to ignite the preheating burner 200. In order to make the combustion uniform, the preheating burner 200 includes a plate-shaped body and a plurality of vent holes arranged through the thickness of the plate-shaped body. The multiple vent holes are used for the mixed gas to pass through and enter the air preheating chamber 140. A plurality of air passage holes can be arranged uniformly or staggered on the plate-shaped body to ensure uniform combustion. The ignition device can specifically be an electronic igniter or an electric heating wire, so that the power consumption is smaller.

The cold air entering the air preheating chamber 140 from the swirling air outlet 143 can be heated by the high temperature flue gas discharged into the air preheating chamber 140 after being burned by the preheating burner 200. Specifically, if the outlet direction of the swirl air outlet 143 is set at an acute angle with the wall surface of the air preheating chamber 140, the air flow blown out from the swirl air outlet 143 is not arranged perpendicular to the wall surface of the air preheating chamber 140, that is, , The airflow blown out by the swirling air outlet 143 is an oblique airflow. The swirl air outlet 143 can be arranged as an oblique hole, so that the swirl air outlet 143 blows out an oblique air flow. That is, the hole wall surface of the swirling air outlet 143 and the inner wall surface of the air preheating chamber 140 are arranged non-vertically. It is also possible to provide an oblique baffle on the inner wall surface of the air preheating chamber 140 close to the wall surface of the swirling air outlet 143 so that the air flow blown out of the swirling air outlet 143 forms a swirling flow in the air preheating chamber 140. An oblique channel, such as an oblique pipe, communicating with the swirl air outlet 143 may also be provided on the outer wall surface of the air preheating chamber 140, so that the air flow blown out from the swirl air outlet 143 is an oblique air flow. By making the airflow blown out of the swirling air outlet 143 an oblique airflow, and the swirling directions of the airflows blowing out of the plurality of swirling air outlets 143 are the same, that is, clockwise or counterclockwise at the same time, the airflow from the swirling air outlet 143 is made to enter The airflow in the air preheating chamber 140 can form a swirling flow.

When the combustor 10 is working, the pre-mixed gas and air are delivered to the pre-heating burner 200, and the pre-heating burner 200 is ignited by the ignition device. After the mixed gas is burned, the high-temperature flue gas enters the air pre-heating chamber 140 At the same time, air enters the air preheating chamber 140 from the swirling air outlet 143 to form a swirling flow. The swirling cold air stays in the air preheating chamber 140 for a long time and has a fast flow rate, so that when the high temperature flue gas burned by the preheating burner 200 is blown into the air preheating chamber 140, it can quickly interact with the swirling air. The cold air is mixed to achieve rapid and uniform preheating of the cold air. At the same time, after the high-temperature flue gas is mixed with the swirling cold air, when it enters the combustion chamber 150, it still has a certain rotation direction, so that the high-temperature gas spirally rises in the combustion chamber 150 and uniformly heats the entire combustion chamber 150. It can be understood that by controlling the heating temperature, the air in the air preheating chamber 140 can be heated to the target temperature, that is, the aforementioned preset temperature, so that high-temperature preheating of the air is realized. Specifically, the combustor 10 further includes a temperature measuring device, and the temperature measuring device is arranged in the air preheating chamber 140. The temperature measuring device is used to detect whether the gas temperature in the air preheating chamber 140 reaches the target temperature. If it does not reach the target temperature, the temperature in the air preheating chamber 140 needs to be increased, and the air inlet volume of the swirling air outlet 143 can be adjusted. Perform control, or control the ratio of gas and air combusted into the preheating burner 200 to achieve temperature adjustment. By detecting the temperature, the preheating burner 200 can automatically adjust the thermal load according to the air volume required for the combustion of the MILD to achieve the effect of quickly preheating the air, while ensuring low CO and NOX emissions during the entire combustion process. The temperature measuring device may be a temperature sensor. After the high-temperature preheated air and high-temperature flue gas are delivered to the combustion chamber 150, the gas outlet 152 is controlled to inject gas, the gas contacts the high-temperature gas, and the high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. The burned heat is discharged through the flue gas outlet 151, and can exchange heat with the heat exchanger of the gas water heater to realize the production of hot water.

The burner 10 of the present application defines an air preheating chamber 140 and a combustion chamber 150 that are communicated with each other in the casing 100, so that the preheating burner 200 is arranged corresponding to the flue gas inlet 142 of the air preheating chamber 140, and the air preheating chamber A plurality of swirling air outlets 143 are arranged at intervals in the circumferential direction of 140, so that the air flow blown out of the swirling air outlets 143 forms a swirling flow in the air preheating chamber 140. Therefore, when the high-temperature flue gas burned by the preheating combustor 200 is blown into the air preheating chamber 140, it can be quickly mixed with the swirling cold air to achieve rapid and uniform preheating of the cold air. The preheating burner 200 ignites and burns the mixed gas to achieve high-temperature preheating air, and then injects gas through the gas outlet 152 to cooperate to produce an entrainment effect, so that the high-temperature flue gas can flow back, and on the one hand, it realizes heat preservation and makes the temperature higher than the spontaneous combustion of the fuel. Point, so that the gas in the combustion chamber can spontaneously ignite, on the other hand, the jet is used to entrain the diluted air to make the oxygen concentration lower than a certain value and achieve uniform combustion. In this way, high-temperature air combustion occurs in the combustion chamber 150. That is to say, the technical solution of this embodiment is beneficial for achieving these two conditions at the same time, and smoothly achieving high-temperature air combustion. In addition, the structure of this burner frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is used in gas water heaters and Including gas wall-hung boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, they not only meet the requirements, but also bring sufficient and low combustion that the burners of existing water heaters do not have. The effect of pollutant discharge. In addition, the fuel gas can be injected only by opening the fuel gas outlet 152 on the combustion chamber 150, the structure is simple and easy to implement, and the entire combustor 10 has a more compact structure and a smaller volume.

In one embodiment, the combustor 10 further includes a diversion device which is provided on the wall surface of the air preheating chamber 140 and communicates with the swirl air outlet 143 to guide the swirl air The airflow from the outlet 143 is blown out around the circumference of the air preheating chamber 140. The drainage device may specifically be a drainage tube, a drainage nozzle, a drainage plate, a drainage channel, etc., and it only needs to be able to guide the air flow blown out of the swirling air outlet 143 or make the air flow blown out of the swirling air outlet 143 form a swirling flow. By setting the drainage device, the outflow velocity of the swirling air outlet 143 is further increased, and the swirling flow is strengthened, so that the gas and air in the air preheating chamber 140 are mixed more uniformly.

Further, as shown in FIGS. 2, 9 and 10, the housing 100 further includes a guide plate 162, which is provided on the side edge of the swirling air outlet 143 extending along the axial direction of the air preheating chamber 140, and is free from The inner wall surface of the air preheating chamber 140 is inclined toward the swirling air outlet 143 to guide the airflow of the swirling air outlet 143 to blow out around the circumference of the air preheating chamber 140.

In this embodiment, the guide plate 162 is connected to the side edge of the swirl air outlet 143 extending in the axial direction of the air preheating chamber 140, and the guide plate 162 faces the swirl air outlet 143 from the inner wall surface of the air preheating chamber 140 When arranged obliquely, the plurality of guide plates 162 are arranged clockwise or counterclockwise in the circumferential direction of the air preheating chamber 140. The guide plate 162 partially shields the swirl air outlet 143, and at the same time can guide the air flow to blow out along the surface of the guide plate 162, so that the air flow blown out from the swirl air outlet 143 is oblique and around the circumference of the air preheating chamber 140 Form a swirling flow. It is understandable that the wall thickness of the housing 100 is generally thin. If only the swirl air outlet 143 is provided as an oblique hole, the angle of the inclination of the air flow blowing from the swirl air outlet 143 will be small, and the air flow cannot be pre-empted. An effective and stable swirling flow is formed in the heating chamber 140. By setting the guide plate 162 to guide the airflow of the swirling air outlet 143 to form a swirling flow in the air preheating chamber 140, on the one hand, the difficulty of processing the swirling air outlet 143 is reduced, and on the other hand, the swirling effect is improved. The air flow blown out from the swirling air outlet 143 can form a stable swirling flow in the air preheating chamber 140, thereby realizing rapid high temperature preheating of the air. In other embodiments, in order to further improve the air swirling effect, the inner wall surface of the swirling air outlet 143 may be inclined, and the inclination direction is consistent with the inclination direction of the guide plate 162.

In one embodiment, the guide plate 162 is fixedly connected to the inner wall surface of the air preheating chamber 140. The drainage plate 162 may be integrally formed with the housing 100, or may be fixedly connected by welding or glue bonding. By making the guide plate 162 fixedly connected to the inner wall surface of the air preheating chamber 140, the guide plate 162 can stably and effectively guide the air flow when the air flow is blown out from the swirling air outlet. This makes the overall structure more stable and improves overall reliability.

In another embodiment, the guide plate 162 is rotatably connected to the inner wall surface of the air preheating chamber 140 to adjust the opening size of the swirling air outlet 143. The guide plate 162 can be rotatably connected to the inner wall surface of the air preheating chamber 140 through hinges, pivots, etc., and the guide plate 162 is equivalent to opening and closing a door, and can adjust the size of the swirling air outlet 143. Specifically, the combustor 10 further includes a driving device and a transmission device connected by a transmission, and the transmission device is connected with a plurality of guide plates 162. The controller controls the driving device to drive the transmission device to drive the plurality of guide plates 162 to rotate, thereby adjusting the opening sizes of the plurality of swirling air outlets 143. By making the guide plate 162 rotatably connected to the inner wall surface of the air preheating chamber 140, on the one hand, the opening size of the swirling air outlet 143 can be adjusted, thereby adjusting the air intake volume of the air preheating chamber 140, and on the other hand, the swirling air outlet 143 can be adjusted. The outflow direction of the air outlet 143 controls the direction and flow rate of the swirling airflow. In this way, the air intake volume and the swirling parameters of the entire swirling air outlet 143 are controllable and flexibly adjusted, which can meet the combustion demand in the entire combustion process.

In one embodiment, referring to FIGS. 11 to 13, the air preheating chamber 140 also has a swirling air inlet 144 corresponding to the swirling air outlet, and each swirling air inlet 144 is corresponding to A swirling passage 145 is formed between the swirling air outlets 143, and the wind passing area of the swirling air outlet 143 is smaller than the wind passing area of the swirling air inlet 144. It can be understood that the extension direction of the swirl channel 145 and the radial and axial directions of the air preheating chamber 140 are arranged at an included angle. By providing the swirling channel 145, the outflow velocity of the swirling air outlet 143 can be further increased, and the swirling flow formed by the air in the air preheating chamber 140 can be strengthened, so that the mixing of gas and air in the air preheating chamber 140 is more uniform. Further, the inner diameter of the swirling channel 145 gradually decreases from the swirling air inlet 144 to the swirling air outlet 143. In this way, the swirl flow blown out from the swirl air outlet 143 is more uniform, the wind loss is small, and the swirl flow formation effect is better.

Specifically, referring to Figures 2, 9 and 10, the angle between the outlet direction of the swirling air outlet 143 and the wall surface of the air preheating chamber 140 (the angle α in Figure 10) is greater than or equal to 0 degrees, And less than or equal to 45 degrees. When the angle between the outflow direction of the swirling air outlet 143 and the wall surface of the air preheating chamber 140 is greater than 45 degrees, the outflow direction of the swirling air gradually moves away from the tangential direction of the wall surface of the air preheating chamber 140, and tends to Towards the center of the air preheating chamber 140, the air flow blown out from the plurality of swirling air outlets 143 is not easy to form a stable swirling flow in the air preheating chamber 140. By making the angle between the outlet direction of the air flow outlet and the wall surface of the air preheating chamber 140 greater than or equal to 0 degrees and less than or equal to 45 degrees, the air flow blown out from the swirling air outlet 143 is substantially along the air preheating chamber. The circumferential rotation of 140 blows out, so that it is easy to form a stable and reliable swirling flow in the air preheating chamber 140, which can be quickly and evenly mixed with the high-temperature flue gas, so that the cold air is quickly and uniformly heated.

In one embodiment, as shown in FIGS. 7 and 8, the housing 100 is further formed with a premixing chamber 130, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are connected in sequence, and the preheating combustor 200 is arranged in The air preheating chamber 140, the premixing chamber 130 has an air inlet 131 for access to air and gas, the combustor 10 also includes a flow turbulence device 300 installed in the premixing chamber 130, and the turbulence device 300 is configured to treat the air and gas The turbulence is performed so that the mixed gas blown out by the turbulence device 300 is a swirling airflow.

In this embodiment, in order to make the gas mixing effect in the air preheating chamber 140 and the combustion chamber 150 better, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are arranged in a straight line to pass through. The preheating combustor 200 may be arranged in the air preheating chamber 140, or may be arranged at the communication place between the air preheating chamber 140 and the premixing chamber 130. The spoiler device 300 may specifically include a fixed spoiler blade, a spiral blade 320, a spiral tube, a rotatable spoiler blade or a spoiler disc, and the like. By arranging the turbulence device 300 in the premixing chamber 130, the turbulence device 300 can agitate and mix air and gas, so that the mixing of gas and air in the premixing chamber 130 is more uniform, so that the mixed gas enters the preheating The combustor 200 burns more fully, ensuring low CO and NOX emissions during the entire combustion process. By making the mixed gas blown by the turbulence device 300 a swirling airflow, the airflow blown from the turbulence device 300 is burned by the preheating burner 200 and then rotates and rises into the air preheating chamber 140, and is connected to the swirling air outlet 143 The swirling air blown into the air preheating chamber 140 is mixed, so that the rotating high-temperature flue gas and the swirling air are fully and evenly mixed, so that the cold air is quickly and evenly heated, and the rotating high-temperature flue gas can drive the swirling flow The air spirally rises into the combustion chamber 150 together, so that the spirally rising high-temperature gas can heat the entire combustion chamber 150 more uniformly.

In order to make the combustion more complete, the gas entering from the air inlet 131 is a mixed gas of fuel gas and air mixed through the premixer. In one embodiment, the pre-mixer includes a casing, a fan, and a gas switch valve. The casing is formed with an air inlet duct, a gas flow channel, and a mixing channel. It is arranged in the air inlet duct, the gas switch valve is arranged in the gas flow channel, and the mixing channel is communicated with the air inlet 131 of the mixed gas distribution chamber. When the mixed gas is needed, the fan is controlled to work and the gas switch valve is controlled to open according to the preset air intake and gas ratio to mix in the casing to obtain a mixed gas with a certain gas/air ratio.

Specifically, the swirling direction of the mixed gas blown out through the spoiler 300 coincides with the swirling direction of the air flow blown out from the swirling air outlet 143. In this way, the swirling direction of the high-temperature flue gas burned by the preheating burner 200 is consistent with the swirling direction of the air flow blown out from the swirling air outlet 143. When the high-temperature flue gas rotates and rises to the air preheating chamber 140, it mixes with the swirling air quickly and uniformly, thereby quickly heating the swirling air to the required temperature, and because the swirling directions of the two airflows are the same, the mixed high temperature The gas enters the combustion chamber 150 and can spirally rise into the entire combustion chamber 150 to uniformly heat the entire combustion chamber 150.

In another embodiment, the swirling direction of the mixed gas blown out by the turbulence device 300 is opposite to the swirling direction of the air flow blown out by the swirling air outlet 143. In this way, the swirling direction of the high-temperature flue gas burned by the preheating burner 200 is opposite to the swirling direction of the air flow blown out from the swirling air outlet 143. When the high-temperature flue gas rotates and rises to the air preheating chamber 140, the rotation directions of the two are opposite, so that the high-temperature flue gas opposes the swirling air, so that the two stay in the air preheating chamber 140 for a longer time. The high-temperature smoke can be fully mixed with the swirling air, thereby heating the swirling air to the required temperature quickly and uniformly.

In one embodiment, referring to FIGS. 7 and 8, the spoiler device 300 includes a spiral component, so that a spiral channel 132 is formed in the premixing chamber 130, and the inlet of the spiral channel 132 communicates with the air inlet 131, and the spiral channel 132 The outlet is in communication with the air preheating chamber 140. The spiral assembly may include a spiral blade 320, which spirally extends along the axial direction of the premixing chamber 130, so that the spiral blade 320 and the inner wall surface of the premixing chamber 130 form a spiral channel 132. In an embodiment, the spiral assembly includes a spiral coil, and a spiral channel 132 is formed in the spiral coil. By forming the spiral channel 132 in the spiral coil, the structure is simple and easy to realize. It should be noted that the spiral channel 132 means that the channel extends in a spiral shape, and when the air flows through the spiral channel 132, the flow path of the air flow is also spiral. By installing spiral components in the premixing chamber 130 to form the spiral passage 132, compared to the premixing chamber 130 without the spiral component, the air flow path is longer, and the air flow generates swirl in the spiral passage 132. Towards. Therefore, when the gas and air enter the spiral channel 132 from the air inlet 131, they are fully and uniformly mixed in the spiral channel 132, and then transported from the outlet of the spiral channel 132 to the preheating burner 200 for combustion, which makes the combustion more Full, low pollutant emissions during the combustion process and low noise. The high-temperature flue gas generated after the preheating burner 200 burns can also form a swirling flow, and has a sufficient rotation speed, so as to fully and uniformly mix with the swirling air in the air preheating chamber 140 to heat the cold air to MILD The temperature required for combustion can also drive the swirling air to spiral upward, so that the mixed high-temperature flue gas can rise to the entire combustion chamber 150 and fully and uniformly heat the entire combustion chamber 150.

On the basis of the foregoing embodiment, further, as shown in FIGS. 6 to 8, the spiral assembly includes a central retaining ring 310 and a spiral blade 320. The inner end of the spiral blade 320 is connected to the central retaining ring 310, and the outer portion of the spiral blade 320 The end is connected to the inner wall surface of the premixing chamber 130 so that a spiral passage 132 is defined between the spiral blade 320, the central retaining ring 310 and the housing 100.

In one embodiment, referring to FIGS. 7 and 8, the housing 100 includes a housing 170 and a first cylinder 180 disposed in the housing 170. The first cylinder 180 defines a combustion chamber 150, and the first cylinder 180 A gas distribution chamber 120 is defined between the gas distribution chamber 120 and the casing 170. The gas distribution chamber 120 has a gas inlet 121, and there are multiple gas outlets 152. 180 circumferential interval settings.

Further, the housing 100 further includes a second cylinder 190 arranged in the housing 170, the second cylinder 190 defines an air preheating chamber 140 and a premixing chamber 130, and defines between the second cylinder 190 and the housing 170 Out of the air distribution chamber 110, the air distribution chamber 110 has an air inlet 111, and a plurality of swirling air outlets 143 are opened on the peripheral wall surface of the second cylinder 190 and are arranged at intervals along the circumference of the second cylinder 190. An air intake pipe is connected to the air inlet 111, and the air intake pipe is connected to an air source, and air can be input through a fan or the like. Only by arranging the first cylinder 180 and the second cylinder 190 in the housing 170, the gas distribution chamber 120, the air distribution chamber 110, the air preheating chamber 140, the combustion chamber 150 and the premixing chamber 130 can be respectively defined. The overall structure is simple and the design is ingenious, so that the entire burner 10 has a small volume, a small footprint, and a beautiful appearance.

On the basis of the foregoing embodiment, further, as shown in Figures 7 and 8, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are arranged in sequence from bottom to top, and the gas outlet 152 is provided in the first cylinder The upper end of 180, and the airflow direction of the gas outlet 152 is set downward or inclined downward. In this way, the air intake direction of the entire combustor 10 is from bottom to top, which conforms to the air flow characteristics, and makes the air flow more smooth. The first cylinder 180 is located above the second cylinder 190, and the outer shell 170 surrounds the first cylinder 180 and the second cylinder 190 to maintain the overall consistency of the appearance, and the layout is more compact and reasonable. The gas outlet 152 is arranged at the upper end of the first cylinder 180, and the airflow of the gas outlet 152 is arranged downward or obliquely downward, and the gas is sprayed downward from the gas outlet 152, forming an entrainment effect in the combustion chamber 150, Makes the gas mixing more uniform, and the combustion is slower and fuller.

Specifically, the upper end of the first cylinder 180 is tapered from bottom to top. In this way, the upper end of the first cylinder 180 is arranged with a necking from bottom to top. When the gas outlet 152 is arranged at the upper end of the first cylinder 180, the gas outlet 152 is arranged obliquely downward, and the plurality of circumferentially spaced gas outlets 152 all inject gas obliquely downward toward the middle of the air preheating chamber 140, Thereby, the gas mixing in the combustion chamber 150 can be made more uniform, and the combustion can be slower and fuller.

In the embodiment of the present application, as shown in FIGS. 14 to 15, the combustor 10 includes a casing 100, a preheating combustor 200 and a flow spoiler 300. The housing 100 is formed with a premixing chamber 130, an air preheating chamber 140, and a combustion chamber 150 that are connected in sequence. The premixing chamber 130 has an air inlet 131 for connecting air and gas, and the air preheating chamber 140 has an air outlet 141 for inflowing air into it. The combustion chamber 150 has a flue gas outlet 151 and a gas outlet 152. The gas outlet 152 is used to inject gas into the combustion chamber 150 so as to cause a high-temperature air combustion reaction in the combustion chamber 150. The preheating burner 200 is installed in the air preheating chamber 140. The preheating burner 200 is used to ignite the mixed gas discharged from the premixing chamber 130 into the air preheating chamber 140 and to adjust the temperature in the air preheating chamber 140 Heat to preset temperature. The flow turbulence device 300 is rotatably arranged in the premixing chamber 130 to turb the gas and air entering the premixing chamber 130.

In order to make the combustion more complete, the gas entering from the air inlet 131 is a mixed gas of fuel gas and air mixed by the premixer. The external air first enters the air distribution chamber 110 of the housing 100, and then enters the air preheating chamber 140 from the air outlet 141. The air flow can be blown into the air distribution chamber 110 through a fan or other devices, and then passes through the air outlet 141 to be relatively uniform Enter the air preheating chamber 140. It should be noted that the air outlet 141 is provided at the air outlet end of the preheating burner 200. That is, when the mixed gas in the premixing chamber 130 is burned by the preheating burner 200, the high-temperature flue gas enters the air preheating chamber 140, and at the same time, enters the air from the air outlet 141 to the air preheating chamber 140, so that the cold air and The high-temperature flue gas in the air preheating chamber 140 is mixed to heat the cold air. The heated air and high-temperature flue gas enter the combustion chamber 150 to heat the combustion chamber 150. In order to fully and uniformly mix the air and the high-temperature flue gas generated during combustion in the air preheating chamber 140, there are multiple air outlets 141, and the multiple air outlets 141 are arranged at intervals around the peripheral wall surface of the air preheating chamber 140 set up. The multiple air outlets 141 can comb the air into multiple uniform airflows, so that when the air is mixed with the high-temperature flue gas combusted in the air preheating chamber 140, it is more fully and uniformly mixed. In order to further agitate the cold air and high-temperature flue gas in the air preheating chamber 140, a stirring device can be provided in the air preheating chamber 140 to fully agitate and mix the cold air and high-temperature flue gas, so that the air is quickly and evenly heated to the preheating temperature. Set temperature.

The gas in the gas distribution chamber 120 can be controlled by an external gas valve. It can be understood that, because the gas valve has a certain air pressure when the gas valve is opened, the gas in the gas distribution chamber 120 can be injected into the combustion chamber 150 from the gas outlet 152. The gas outlet 152 may specifically be an opening opened on the wall of the casing 100, or may be a gas nozzle or an air flow outlet of a gas nozzle, so that high-speed jets of gas are realized when the gas is ejected from the gas outlet 152 of the gas injection device. The high-speed injected gas forms an entrainment effect in the combustion chamber 150, so that an injection burner and a flue gas recirculation zone are formed in the combustion chamber 150, and the high-temperature flue gas in the combustion chamber 150 circulates quickly and intensively in the combustion chamber 150 , And then fully dilute the injected fuel gas and the incoming air to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain a higher temperature in the combustion chamber 150, keeping the temperature higher than the fuel's spontaneous ignition point to achieve spontaneous combustion. In this way, this embodiment satisfies the conditions of high-temperature air combustion (MILD combustion): high-temperature preheated air combined with high-speed jets realizes entrainment of high-temperature flue gas and dilutes and ignites the air jets, so that the oxygen concentration is lower than a certain value and the temperature is higher than the fuel The spontaneous ignition point.

The preheating burner 200 may specifically be a fully premixed burner. The preheating burner 200 can be installed in the air preheating chamber 140 or at the gas flow ports of the premixing chamber 130 and the air preheating chamber 140. The preheating burner 200 is used to discharge the premixing chamber 130 into the air. The mixed gas in the preheating chamber 140 is ignited. Specifically, the combustor 10 further includes an ignition device arranged in the casing 100 adjacent to the preheating burner 200, and the ignition device is used for igniting the preheating burner 200. In order to make the combustion uniform, the preheating burner 200 includes a plate-shaped body and a plurality of vent holes arranged through the thickness of the plate-shaped body. The multiple vent holes are used for the mixed gas to pass through and enter the air preheating chamber 140. A plurality of air passage holes can be arranged uniformly or staggered on the plate-shaped body to ensure uniform combustion. The ignition device can specifically be an electronic igniter or an electric heating wire, so that the power consumption is smaller.

The spoiler device 300 may specifically include structures such as a spoiler, a spoiler, a comb structure, and a spoiler blade. The spoiler 300 can be rotated automatically or driven by a driving device to achieve rotation. The automatic rotation of the spoiler device 300 means that the spoiler device 300 achieves low or frictionless contact through the rotating shaft, or the rotating shaft and the bearing 350, when the mixed airflow enters the premixing chamber 130 from the air inlet 131, the mixture is mixed The air flow drives the turbulence device 300 to rotate, cutting and stirring the mixed gas, so that the gas and the air are evenly mixed. In one embodiment, the spoiler 300 includes a spoiler and a rotating shaft 340 connected to the spoiler, and the combustor 10 further includes a driving device connected to the rotating shaft 340 to drive the spoiler to rotate. The spoiler is fixedly connected to the rotating shaft 340, and the driving device may specifically be a driving member capable of driving the rotating shaft 340 to rotate, such as a driving motor. The output shaft of the driving motor is connected with the rotating shaft 340, which in turn drives the spoiler to rotate, so as to realize the cutting and stirring of the mixed gas, so as to achieve the purpose of uniformly mixing the gas and air. When the mixed gas is stirred and mixed by the turbulence device 300 into the preheating burner 200 for combustion, the combustion is more complete, the pollutant emission during the combustion process is low, and the noise is low.

When the combustor 10 is working, the mixed gas is delivered from the air inlet 131 into the premixing chamber 130, and the spoiler 300 rotates so that the gas and air are evenly mixed. After the preheating combustor 200 is ignited by the ignition device, the mixing After the gas is burned, the high-temperature flue gas enters the air preheating chamber 140, while the air enters the air preheating chamber 140 from the air distribution chamber 110 through the air outlet 141, and the high-temperature flue gas is mixed with cold air to heat the cold air. It can be understood that by controlling the heating temperature, the air in the air preheating chamber 140 can be heated to the target temperature, that is, the preset temperature is such that the high temperature preheating of the air is realized. Specifically, the combustor 10 further includes a temperature measuring device, and the temperature measuring device is arranged in the air preheating chamber 140. The temperature measuring device is used to detect whether the gas temperature in the air preheating chamber 140 reaches the target temperature. If it does not reach the target temperature, the temperature in the air preheating chamber 140 needs to be increased, which can control the amount of air intake or control the preheating temperature. The ratio of gas and air in the mixing chamber 130 realizes temperature adjustment. By detecting the temperature, the preheating burner 200 can automatically adjust the thermal load according to the air volume required for the combustion of the MILD to achieve the effect of quickly preheating the air, while ensuring low CO and NOX emissions during the entire combustion process. The temperature measuring device may be a temperature sensor. After the high-temperature preheated air and high-temperature flue gas are delivered to the combustion chamber 150, the gas outlet 152 is controlled to inject gas, the gas contacts the high-temperature gas, and the high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. The burned heat is discharged through the flue gas outlet 151, and can exchange heat with the heat exchanger of the gas water heater to realize the production of hot water.

The combustor 10 of the present application is provided with a premixing chamber 130, an air preheating chamber 140, and a combustion chamber 150 that are sequentially connected in the casing 100, and a rotatable spoiler 300 is provided in the premixing chamber 130, so the premixing chamber 130 The air and gas inside are more evenly mixed, so that the mixed gas in the premixing chamber 130 is burned more fully in the preheating combustor 200 to ensure low CO and NOx emissions during the entire combustion process. The preheating burner 200 ignites and burns the mixed gas to achieve high-temperature preheating air, and then injects gas through the gas outlet 152 to cooperate to produce an entrainment effect, so that the high-temperature flue gas can flow back, and on the one hand, it realizes heat preservation and makes the temperature higher than the spontaneous combustion of the fuel. Point, so that the gas in the combustion chamber can spontaneously ignite, on the other hand, the jet is used to entrain the diluted air to make the oxygen concentration lower than a certain value and achieve uniform combustion. In this way, high-temperature air combustion occurs in the combustion chamber 150. That is to say, the technical solution of this embodiment is beneficial for achieving these two conditions at the same time, and smoothly achieving high-temperature air combustion. In addition, the structure of this burner frame can miniaturize the components that realize high-temperature air combustion, so that it has more application space and value. In addition, it has low noise, sufficient combustion, and low exhaust gas pollution. It is used in gas water heaters and Including gas wall-hung boilers and other related products and equipment that use gas combustion to generate high-temperature hot water for household bathing and heating, they not only meet the requirements, but also bring sufficient and low combustion that the burners of existing water heaters do not have. The effect of pollutant discharge. In addition, only the gas outlet 152 is provided on the combustion chamber 150 to achieve gas injection, which has a simple structure and is easy to implement, and makes the structure of the entire combustor 10 more compact and smaller.

In one embodiment, as shown in FIGS. 14 and 15, the spoiler device 300 includes a spoiler, a rotating shaft 340, and a bearing 350 sleeved on the rotating shaft 340. The spoiler can pass through the rotating shaft 340 and the bearing 350. It is rotatably installed in the housing 100, and the spoiler is located between the air inlet 131 and the preheating combustor 200.

In this embodiment, the spoiler may specifically be a spoiler, a spoiler disc, a comb structure, a spoiler blade, and other structures capable of agitating the airflow. The bearing 350 is specifically a rolling bearing 350, so that the frictional resistance between the rotating shaft 340 and the bearing 350 is small, and when the airflow blows the spoiler, the spoiler can be rotated to realize cutting and stirring of gas and air. Further mix the gas. If the spoiler is located between the air inlet 131 and the preheating burner 200, the air flow from the air inlet 131 into the premixing chamber 130 can be directly blown to the spoiler, thereby driving the spoiler to rotate more effectively. good. The air inlet 131 may be opened on the peripheral wall surface or the bottom wall surface of the premixing chamber 130. By enabling the spoiler to be rotatably mounted on the housing 100 through the rotating shaft 340 and the bearing 350, there is no need to additionally provide a driving device to drive the spoiler to rotate, and the automatic rotation of the spoiler is realized by the airflow of the air inlet 131, and the structure It is simple and ingenious, occupies a small space, and has a good mixing effect. It is understandable that, in other embodiments, the bearing 350 can also be replaced with a plurality of rolling elements arranged in the circumferential direction. In this case, the rolling elements need to be embedded in the housing 100 or the spoiler to realize the rotating shaft 340 to drive disturbance. The flow element rotates relative to the housing 100 or the rolling element drives the spoiler to rotate relative to the housing 100. In order to make the airflow entering from the air inlet 131 have a better blowing effect on the spoiler, the air inlet 131 is opened on the peripheral wall surface of the premixing chamber 130. Compared with the opening of the air inlet 131 at the bottom of the premixing chamber 130, the airflow is blown from the side to the spoiler, so that the airflow can exert a large force on the spoiler in the upper circumferential direction, thereby pushing the spoiler to rotate. The effect is better. In other embodiments, the spoiler can also be directly rotatably mounted on the housing 100 via the rotating shaft 340.

On the basis of the foregoing embodiment, and further, referring to FIGS. 14 and 15 again, the bearing 350 is installed on the housing 100, one end of the rotating shaft 340 is connected to the bearing 350, and the other end is fixedly connected to the spoiler. The bearing 350 is installed on the bearing 350 seat of the housing 100. Compared with the solution of installing the bearing 350 on the spoiler, the weight of the spoiler can be reduced, so that the rotation of the spoiler under the air blow is more labor-saving , Thereby increasing the rotation speed of the spoiler and improving the airflow mixing effect. Specifically, there are at least two bearings 350, and the two bearings 350 are spaced apart along the extending direction of the rotating shaft 340. It is understandable that if the housing 100 is configured to have a structure with a certain thickness, double-layer or multi-layer walls, two or more bearings 350 are provided on the housing 100. By arranging two or more bearings 350 at intervals along the extension direction of the rotating shaft 340, on the one hand, the rotating connection between the rotating shaft 340 and the housing 100 is made more stable, and the rotating shaft 340 is prevented from being deflected, thereby causing a spoiler On the other hand, the working reliability of the spoiler is ensured, so that when one of the bearings 350 fails, the free rotation of the rotating shaft 340 relative to the housing 100 can still be ensured, so that the spoiler can always be in the air flow. Freely rotating cutting and stirring air flow under the blowing.

In another embodiment, the bearing 350 is installed on the spoiler, one end of the rotating shaft 340 is fixedly installed on the housing 100, and the other end is rotatably connected to the spoiler through the bearing 350. In this way, as the spoiler rotates with the bearing 350 relative to the rotating shaft 340, the spoiler can also rotate freely under the blow of the air flow, thereby realizing agitating the mixed gas.

In one embodiment, referring to FIGS. 14 to 17, the spoiler includes a disc 330. It can be understood that the disc-shaped body 330 may specifically be a disc-shaped structure such as a circular disc, an elliptical disc, or a square disc. If the spoiler includes the disc 330, the contact area between the spoiler and the mixed gas entering the air inlet 131 can be increased, so that the force-receiving area of the spoiler is large, and the spoiler can be smoothly pushed by the airflow The free rotation to cut and stir the gas. The cross-sectional area of the disc 330 should be smaller than the cross-sectional area of the pre-mixing chamber 130, so that the disc 330 can rotate unimpeded in the pre-mixing chamber 130, and the air flow can flow from the disc 330 and the inner wall of the pre-mixing chamber 130. The gap therebetween flows to the air preheating chamber 140.

In practical applications, the disc-shaped body 330 is provided with a plurality of spoiler holes 333, and the plurality of spoiler holes 333 are arranged at intervals along the circumferential direction of the disc-shaped body 330. The shape of the spoiler 333 can be circular, rectangular, irregular, or the like. By opening a plurality of spoiler holes 333 on the disc-shaped body 330, on the one hand, the weight of the disc-shaped body 330 can be effectively reduced, thereby reducing the resistance to air flow. On the other hand, the spoiler holes 333 can increase the path of the mixed gas channel. Thereby, the gas flow rate is improved, and the spoiler 333 can split the mixed gas, further improving the mixing effect of gas and air. The spoiler holes 333 can be arranged in multiple circles, and the multi-circle spoiler holes 333 are arranged at intervals from the center of the disc 330 to the periphery. In this way, the turbulence holes 333 are distributed on the disc-shaped body 330, and the effect of cutting the agitated air flow as a whole is better. At this time, the cross-sectional area of the disc 330 may be slightly smaller than the cross-sectional area of the pre-mixing chamber 130, so as to stir and cut the air flow in the pre-mixing chamber 130 as much as possible.

In order to further improve the mixing effect of the mixed gas, the disc 330 is provided with a plurality of spoiler holes 333. Furthermore, as shown in FIGS. 14 and 15, the disc 330 is spaced apart from the inner wall surface of the housing 100 The inner wall surface of the casing 100 is further provided with a baffle ring 161, and the height of the baffle ring 161 is greater than or equal to the distance between the disc 330 and the inner wall surface of the casing 100. In the direction, the retaining ring 161 is located downstream of the disc 330. The disc-shaped body 330 and the inner wall surface of the housing 100 are spaced apart, and the disc-shaped body 330 can be ensured to rotate smoothly without obstruction in the pre-mixing chamber 130. A baffle ring 161 is provided downstream of the disc 330, and the baffle ring 161 is used to block the gap between the disc 330 and the inner wall surface of the housing 100. When the mixed gas passes through the disc 330, the gap can be enlarged. The resistance prevents the mixed gas from escaping from the gap between the disc 330 and the inner wall surface of the housing 100. As a result, all the airflow entering the premixing chamber 130 from the air inlet 131 passes through the disc 330 and passes through the spoiler hole 333 of the disc 330, so that the mixed airflow can be effectively combed, and the disc 330 can simultaneously The mixed air flow passing through the spoiler hole 333 is cut and stirred to further improve the mixing effect of gas and air.

In other embodiments, the spoiler includes a plurality of blades arranged at intervals along the circumference of the premixing chamber 130. The number and size of the blades can be selected and designed according to the size of the cross-sectional area of the premixing chamber 130. Specifically, the number of blades can be three, four, five, etc. The blades can be arranged at intervals in the circumferential direction, and two adjacent blades can also be partially overlapped. By making the spoiler include a plurality of blades, when the spoiler rotates, the gas can also be cut and stirred, so that the gas and the air are fully mixed.

Based on the embodiment in which the spoiler includes the disc-shaped body 330, and further, referring to FIG. 14 and FIG. In this way, the disk-shaped body 330 is roughly horn-shaped, and the large end of the disk-shaped body 330 is close to the preheating burner 200 and the small end is close to the air inlet 131. Then the mixed airflow enters the premixing chamber 130 from the air inlet 131, and is directly blown to the outer side of the disc 330, and expands outward along the wall of the disc 330, so that the effect of pushing the disc 330 to rotate is better. , And the effect of stirring the mixed air flow is better.

In combination with an embodiment in which the spoiler includes a disc-shaped body 330, further, as shown in Figs. 14, 15 and 17, the disc-shaped body 330 includes a plurality of concave portions 331 and a plurality of convex portions 332 arranged at intervals along the circumferential direction thereof , A concave portion 331 is connected between two adjacent convex portions 332. In order to further increase the wind-receiving area, the disc-shaped body 330 is composed of a plurality of concave portions 331 and convex portions 332 at intervals. In this way, both the inner wall surface and the outer wall surface of the disc-shaped body 330 are undulating. By providing the disc-shaped body 330 with a structure in which a plurality of recesses 331 and a plurality of convex parts 332 are spaced apart, the wind-receiving area of the disc-shaped body 330 can be increased compared to the disc-shaped body 330 with a flat surface, and the disc-shaped body 330 can be increased. The wind direction and angle of the wind are increased, so that the mixed gas drives the disc 330 to rotate more effectively. On the basis of the embodiment in which the disc 330 is provided with the spoiler holes 333, the spoiler holes 333 are distributed on the concave portion 331 or the convex portion 332. In this way, the disc 330 can be ensured on the premise that the flow of mixed gas can be satisfied. It rotates smoothly under the blowing of the mixed gas.

In one embodiment, please refer to FIGS. 14 and 15 again. The housing 100 includes a housing 170 and a first cylinder 180 disposed in the housing 170. The first cylinder 180 defines a combustion chamber 150, and the first cylinder A gas distribution chamber 120 is defined between 180 and the housing 170. The gas distribution chamber 120 has a gas inlet 121, and there are multiple gas outlets 152. The body 180 is arranged at intervals in the circumferential direction.

On the basis of the foregoing embodiment, further, as shown in Figures 14 and 15, the premixing chamber 130, the air preheating chamber 140, and the combustion chamber 150 are arranged in sequence from bottom to top, and the gas outlet 152 is provided in the first cylinder The upper end of 180, and the airflow direction of the gas outlet 152 is set downward or inclined downward. In this way, the air intake direction of the entire combustor 10 is from bottom to top, which conforms to the air flow characteristics, and makes the air flow more smooth. The first cylinder 180 is located above the second cylinder 190, and the outer shell 170 surrounds the first cylinder 180 and the second cylinder 190 to maintain the overall consistency of the appearance, and the layout is more compact and reasonable. The gas outlet 152 is arranged at the upper end of the first cylinder 180, and the airflow of the gas outlet 152 is arranged downward or obliquely downward, and the gas is sprayed downward from the gas outlet 152, forming an entrainment effect in the combustion chamber 150, Makes the gas mixing more uniform, and the combustion is slower and fuller.

In addition, the present application also provides a gas water heater, including a main body, a heat exchanger, and a burner 10. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber. The heat exchanger is arranged in the heat exchange chamber and burns. The flue gas outlet 151 of the device 10 is in communication with the heat exchange chamber. It should be noted that the gas in the gas distribution chamber 120 can be provided through an external gas pipeline, and a gas proportional valve is set on the gas pipeline for control, while the air in the air distribution chamber 110 is controlled by an independent fan. The fans are independent of each other.

The detailed structure of the burner 10 can refer to the embodiment of the above-mentioned burner 10, which will not be repeated here; it is understandable that since the above-mentioned burner 10 is used in the gas water heater of the present application, the implementation of the gas water heater of the present application The examples include all the technical solutions of all the embodiments of the above-mentioned burner 10, and the technical effects achieved are also completely the same, which will not be repeated here.

Combining the foregoing embodiments of the burner 10, the working principle of the burner 10 of the present application applied to a gas water heater is described:

When the water heater is started, the gas switch valve of the premixer and the fan provide the air and gas mixed in a certain proportion to the premixing chamber 130 through the air inlet 131, which is stirred by the spoiler 300, and after fully mixed, it is supplied to the preheating burner 200. The ignition device ignites, and combustion starts in the combustion zone of the air preheating chamber 140. The fan corresponding to the air distribution chamber 110 also acts to suck in the air required for combustion. The cold air blown out from the air outlet 141 is combusted with the preheating burner 200 to produce The high-temperature flue gas is mixed in the air preheating chamber 140 to form high-temperature flue gas. When the temperature measuring device detects that the temperature of the high-temperature flue gas reaches the temperature required for MILD combustion, the gas valve provides gas to the gas distribution chamber 120, and the gas required for MILD combustion is injected from the gas outlet 152 to the combustion chamber 150 to combine with the high-temperature gas. The high-temperature gas ignites the gas to achieve MILD combustion in the combustion chamber 150. Since the gas is injected through the gas outlet 152, an entrainment effect is formed in the combustion chamber 150, so that an injection combustion zone and a flue gas return zone are formed in the combustion chamber 150. Make part of the flue gas circulate intensively in the combustion chamber 150, and then fully dilute the injected gas and air to form a lower oxygen concentration, reduce the combustion reaction speed, and maintain a higher temperature in the combustion chamber 150 to ensure that the temperature is higher than that of the fuel Spontaneous ignition point, to achieve spontaneous combustion. In this way, this embodiment satisfies the conditions of high-temperature air combustion (MILD combustion): high-temperature preheated air combined with high-speed jets realizes entrainment of high-temperature flue gas and dilutes and ignites the air jets, so that the oxygen concentration is lower than a certain value and the temperature is higher than the fuel The spontaneous ignition point. The burned heat can be exchanged with the heat exchanger of the gas water heater and then discharged to the outside to achieve hot water production.

It is understandable that the use of the burner 10 in the gas water heater enables the gas water heater to effectively reduce CO and NOx emissions and reduce the noise of the gas water heater.

Claims

A burner, which includes:

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber having a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber; and

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber The temperature is heated to the preset temperature.
The combustor according to claim 1, wherein the casing includes a casing and a first cylinder provided in the casing, and the combustion chamber is defined in the first cylinder;

A gas distribution chamber is defined between the first cylinder and the outer shell, the gas outlet is in communication with the gas distribution chamber, the gas distribution chamber has a gas inlet, and the gas outlets are multiple, and there are multiple outlets. The gas outlets are opened on the peripheral wall surface of the first cylinder, and are arranged at intervals along the circumferential direction of the first cylinder.
The combustor according to claim 2, wherein the casing further comprises a second cylinder provided in the outer shell, and the second cylinder defines the air preheating chamber and the premixing chamber , An air distribution chamber is defined between the second cylinder and the housing, the air distribution chamber has an air inlet, the air outlets are multiple, and the multiple air outlets are opened in the second cylinder The peripheral wall surface is arranged at intervals along the circumferential direction of the second cylinder.
The combustor according to claim 3, wherein the premixing chamber, the air preheating chamber, and the combustion chamber are arranged in sequence from bottom to top, and the gas outlet is provided at the upper end of the first cylinder , And the airflow direction of the gas outlet is set downward or inclined downward.
The combustor according to any one of claims 1 to 4, wherein the combustor further comprises a flow turbulence device installed in the premixing chamber and arranged such that the premixing chamber A spiral channel is formed, the inlet of the spiral channel is in communication with the air inlet, and the outlet of the spiral channel is in communication with the air preheating chamber.
The combustor according to claim 5, wherein the turbulence device includes a central retaining ring and a spiral blade, the inner end of the spiral blade is connected to the central retaining ring, and the outer end of the spiral blade is connected to the central retaining ring. The inner wall surface of the premixing chamber is arranged such that the spiral passage is defined between the spiral blade, the central retaining ring and the housing.
The combustor according to claim 6, wherein the helix angle of the spiral blade is greater than or equal to 10 degrees and less than or equal to 45 degrees.
The combustor according to claim 6, wherein the ratio of the extension height of the premixing chamber to the extension height of the spiral blade is greater than or equal to 1.2 and less than or equal to 2.
The combustor according to claim 6, wherein the ratio of the inner diameter of the premixing chamber to the outer diameter of the center retaining ring is greater than or equal to 1.5 and less than or equal to 4.
The combustor according to claim 6, wherein the bottom of the center retaining ring and the bottom wall surface of the premixing chamber are spaced apart.
A gas water heater, which comprises a main body, a heat exchanger and a burner. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber, and the heat exchanger is arranged on the heat exchange chamber. Indoors, the flue gas outlet of the burner is in communication with the heat exchange chamber, and the burner includes:

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber having a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber; and

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber The temperature is heated to the preset temperature.
A burner, which includes:

A casing, the casing is formed with an air preheating chamber and a combustion chamber communicating with each other, the air preheating chamber has a flue gas inlet and a plurality of swirling air outlets spaced apart along the circumference of the air preheating chamber , The swirl air outlet is configured to input air into the air preheating chamber, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that all The high-temperature air combustion reaction in the combustion chamber;

A preheating burner is provided corresponding to the flue gas inlet, and the preheating burner is configured to ignite the pre-mixed gas and air mixture and discharge it into the air preheating chamber through the flue gas inlet, and Heating the temperature in the air preheating room to a preset temperature;

Wherein, the swirling directions of the air flows blown from the plurality of swirl air outlets are the same, and are arranged so that the air flows blown from the swirl air outlets form a swirl in the air preheating chamber.
The combustor according to claim 12, wherein the combustor further comprises a diversion device, the diversion device is provided on the wall surface of the air preheating chamber, and communicates with the swirling air outlet, and is configured to guide The airflow of the swirling air outlet is blown out around the circumference of the air preheating chamber.
The combustor according to claim 13, wherein the guide device comprises a guide plate, the guide plate is arranged on the side edge of the swirl air outlet extending in the axial direction of the air preheating chamber, and The inner wall surface of the air preheating chamber is inclinedly arranged toward the swirling air outlet.
The burner of claim 13, wherein the guide plate is fixedly connected to the inner wall surface of the air preheating chamber, or the guide plate is rotatably connected to the inner wall surface of the air preheating chamber, It is configured to adjust the opening size of the swirling air outlet.
The combustor according to claim 12, wherein the air preheating chamber further has a swirl air inlet corresponding to the swirl air outlet, and each of the swirl air inlets corresponds to the swirl air A swirling channel is formed between the outlets, and the wind passing area of the swirling air outlet is smaller than the wind passing area of the swirling air inlet.
The combustor according to claim 16, wherein the inner diameter of the swirling passage gradually decreases from the swirling air inlet to the swirling air outlet.
The combustor according to claim 12, wherein the angle between the outlet direction of the swirling air outlet and the wall surface of the air preheating chamber is greater than or equal to 0 degrees and less than or equal to 45 degrees.
The combustor according to any one of claims 12 to 18, wherein the casing is further formed with a premixing chamber, and the premixing chamber, the air preheating chamber, and the combustion chamber are connected in sequence, so The preheating combustor is arranged in the air preheating chamber, the premixing chamber has an air inlet for connecting air and gas, the combustor further includes a flow turbulence device installed in the premixing chamber, the The turbulence device is configured to turb the air and gas, so that the mixed gas blown out by the turbulence device is a swirling airflow.
The burner according to claim 19, wherein:

The swirling direction of the mixed gas blown out through the turbulence device is consistent with the swirling direction of the airflow blown out of the swirling air outlet; or,

The swirling direction of the mixed gas blown out by the turbulence device is opposite to the swirling direction of the air flow blown out by the swirling air outlet.
A gas water heater, which comprises a main body, a heat exchanger and a burner. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber, and the heat exchanger is arranged on the heat exchange chamber. Indoors, the flue gas outlet of the burner is in communication with the heat exchange chamber, and the burner includes:

A casing, the casing is formed with an air preheating chamber and a combustion chamber communicating with each other, the air preheating chamber has a flue gas inlet and a plurality of swirling air outlets spaced apart along the circumference of the air preheating chamber The swirl air outlet is configured to input air into the air preheating chamber, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that the High-temperature air combustion reaction in the combustion chamber;

A preheating burner is provided corresponding to the flue gas inlet, and the preheating burner is configured to ignite the pre-mixed gas and air mixture and discharge it into the air preheating chamber through the flue gas inlet, and Heating the temperature in the air preheating room to a preset temperature;

Wherein, the swirling directions of the air flows blown from the plurality of swirl air outlets are the same, and are arranged so that the air flows blown from the swirl air outlets form a swirl in the air preheating chamber.
A burner, which includes:

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber;

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber Heated to a preset temperature; and

A flow turbulence device, the flow turbulence device is rotatably provided in the premixing chamber, and is configured to turb the flow of gas and air entering the premixing chamber.
The combustor according to claim 22, wherein the spoiler includes a spoiler, a rotating shaft, and a bearing sleeved on the rotating shaft, and the spoiler passes through the rotating shaft and the bearing The spoiler is rotatably installed on the housing, and the spoiler is located between the air inlet and the preheating burner.
The combustor according to claim 23, wherein the bearing is installed on the housing, one end of the rotating shaft is connected to the bearing, and the other end is fixedly connected to the spoiler.
The combustor according to claim 22, wherein the air inlet is opened on the peripheral wall of the premixing chamber.
The combustor according to claim 22, wherein the spoiler includes a spoiler and a rotating shaft connected to the spoiler, and the combustor further includes a drive device that is connected to the The rotating shaft is connected and is configured to drive the spoiler to rotate.
The combustor according to any one of claims 22, wherein the spoiler comprises a disc-shaped body; or, the spoiler comprises a plurality of blades arranged at intervals along the circumference of the premixing chamber.
The combustor according to claim 27, wherein the disc-shaped body is gradually arranged to a side close to the preheating combustor.
The combustor according to claim 27, wherein the disc-shaped body includes a plurality of concave portions and a plurality of convex portions arranged at intervals along the circumference thereof, and a concave portion is connected between two adjacent convex portions.
The burner according to claim 27, wherein the disc-shaped body is provided with a plurality of spoiler holes, and the plurality of spoiler holes are arranged at intervals along the circumferential direction of the disc-shaped body.
The burner according to claim 27, wherein the disc-shaped body is spaced apart from the inner wall surface of the casing, and the inner wall surface of the casing is further provided with a baffle ring, and the convex setting of the baffle ring The height is greater than or equal to the distance between the disc-shaped body and the inner wall surface of the casing, and the baffle ring is located downstream of the disc-shaped body in the air outlet direction of the premixing chamber.
A gas water heater, which comprises a main body, a heat exchanger and a burner. The main body is provided with a heat exchange chamber and a smoke outlet communicating with the heat exchange chamber, and the heat exchanger is arranged on the heat exchange chamber. Indoors, the flue gas outlet of the burner is in communication with the heat exchange chamber, and the burner includes:

A housing, the housing is provided with a premixing chamber, an air preheating chamber, and a combustion chamber that are connected in sequence, the premixing chamber has an air inlet for connecting air and gas, and the air preheating chamber has an inner An air outlet for inflowing air, the combustion chamber has a flue gas outlet and a gas outlet, and the gas outlet is configured to inject gas into the combustion chamber so that a high-temperature air combustion reaction occurs in the combustion chamber;

A preheating burner installed in the air preheating chamber, and the preheating burner is configured to ignite the mixed gas discharged from the premixing chamber into the air preheating chamber, and to ignite the air preheating chamber Heated to a preset temperature; and

A flow turbulence device, the flow turbulence device is rotatably provided in the premixing chamber, and is configured to turb the flow of gas and air entering the premixing chamber.