CN212618286U

CN212618286U - Combustor and gas water heater

Info

Publication number: CN212618286U
Application number: CN202020974570.1U
Authority: CN
Inventors: 梁泽锋; 陆祖安; 邹春; 曲绍鹤; 李忠华; 李嘉瑞; 程偲哲
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-10-17
Filing date: 2020-05-30
Publication date: 2021-02-26
Anticipated expiration: 2030-05-30
Also published as: CN112682781B; CN112682791B; CN112682787B; CN213272606U; CN112682781A; WO2021244494A1; CN112682787A; CN112682792A; CN112682789A; CN112682785A; WO2021244492A1; CN112682789B; CN112682788B; CN112682791A; CN112682790B; CN212618283U; CN112682782A; CN112682784A; CN112682788A; CN212618284U

Abstract

The utility model discloses a burner and a gas water heater, wherein the burner comprises a shell, a pre-mixer, a preheating burner and a gas injection pipe, and the shell forms an air inlet chamber and a combustion chamber which are communicated; the premixer is connected with fuel gas and air for premixing and provides mixed gas for the combustion chamber; the preheating burner ignites the mixed gas in the combustion chamber and heats the temperature in the combustion chamber to a preset temperature; the gas injection pipe is provided with an injection port arranged on the side part of the combustion chamber and used for injecting gas into the combustion chamber so as to enable high-temperature air combustion reaction to be carried out in the combustion chamber. The utility model discloses a combustor and gas heater with high temperature air combustion function.

Description

Combustor and gas water heater

This application claims priority from chinese patent application entitled "burner and gas water heater" filed on 17/10/2019, application No. 201910992986.8, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to a high temperature air burning technical field, in particular to combustor and gas heater.

Background

High temperature air combustion (high temperature air combustion) is called MILD and deep low oxygen dilution combustion, and is called a novel combustion mode for short, namely MILD combustion. The main characteristics of the combustion are as follows: the chemical reactions mainly take place in a high temperature, low oxygen environment, with the reactants at a temperature above their natural temperature and the maximum temperature rise during combustion below their natural temperature, with the oxygen volume fraction being diluted by the combustion products to an extremely low concentration, typically 3% to 5%. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is very uniform during the combustion, the generation of thermal nitrogen oxides is reduced, and the emission of pollutants NOx and CO is greatly reduced.

Although high temperature air combustion has many of the advantages described above, it is currently an industrial application and is not used in everyday life.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a combustor and gas heater with high temperature air burning function.

To achieve the above object, the present invention provides a burner, including:

the shell forms an air inlet chamber and a combustion chamber which are communicated in sequence;

the premixer is used for accessing fuel gas and air, premixing the fuel gas and the air and providing mixed gas for the combustion chamber;

the preheating burner is used for igniting the mixed gas in the combustion chamber and heating the temperature in the combustion chamber to a preset temperature; and the number of the first and second groups,

and the gas injection pipe is provided with an injection port arranged at the side part of the combustion chamber, and is used for injecting gas into the combustion chamber so as to perform high-temperature air combustion reaction in the combustion chamber.

In one embodiment, the injection ports are arranged in plurality at intervals along the circumferential direction of the combustion chamber.

In one embodiment, the gas injection pipe is arranged such that the gas injected through the injection port is swirled in the combustion chamber.

In one embodiment, the combustion chamber has a flue gas outlet, and the gas injection pipe has a passage section connected with the injection port;

the passage section is inclined in the direction of gradually departing from the flue gas outlet in the direction of approaching the jet orifice.

In one embodiment, the gas injection pipe is arranged at the peripheral side part of the shell in a surrounding way;

and the jet orifice of the fuel gas jet pipe penetrates through the shell and then is arranged in the combustion chamber.

In one embodiment, the air intake chamber has a plurality of air supply ports provided in a side portion of the combustion chamber, and the plurality of air supply ports are arranged at intervals in a circumferential direction of the combustion chamber.

In one embodiment, the burner further comprises an air duct shell, and the air duct shell is arranged on the outer peripheral side of the shell in a surrounding mode so as to form the air inlet chamber together with the shell at the position of the air duct shell.

In one embodiment, the preheat burner has a mixed gas distribution chamber with an inlet in communication with the premixer and an outlet in communication with the combustion chamber.

In one embodiment, the preheating burner comprises a housing forming the mixed gas distribution chamber, a combustion assembly disposed at an air outlet of the mixed gas distribution chamber, and an ignition device disposed within the combustion chamber and configured to ignite the combustion assembly.

In one embodiment, the air inlet chamber has an air supply opening provided at a side portion of the combustion chamber, the air supply opening being provided adjacent to the combustion assembly.

In one embodiment, the gas inlet of the mixed gas distribution chamber is flared in a direction towards the gas outlet of the mixed gas distribution chamber.

In one embodiment, the combustion chamber comprises a first combustion chamber and a second combustion chamber which are communicated in sequence;

the first combustion chamber is respectively communicated with an air outlet of the mixed gas distribution chamber and an air outlet of the air inlet chamber;

the second combustion chamber is communicated with the jet orifice of the gas jet pipe.

In one embodiment, the housing includes a first housing forming the first combustion chamber, and a second housing forming the second combustion chamber;

the first shell is detachably connected with the second shell.

In an embodiment, the burner further comprises a flame sensing device, the flame sensing device is arranged in the combustion chamber and close to the preheating burner, and the flame sensing device is used for detecting whether the preheating burner is in a combustion state or not and controlling the preheating burner to be re-ignited when detecting that the preheating burner is not in the combustion state.

In an embodiment, the combustor further includes a temperature measuring device, the temperature measuring device is disposed in the combustion chamber, and the temperature measuring device is configured to detect whether a temperature in the combustion chamber reaches a preset target temperature.

In one embodiment, the premixer comprises a casing, a fan and a gas switch valve, the casing is formed with an air inlet channel, a gas flow channel and a mixing channel, the mixing channel is respectively communicated with the air inlet channel and the gas flow channel, the fan is arranged in the air inlet channel, the gas switch valve is arranged in the gas flow channel, and the mixing channel is communicated with the gas inlet of the mixed gas distribution chamber.

In one embodiment, the preheat burner is a fully premixed burner.

Furthermore, in order to achieve the above object, the utility model also provides a gas water heater, gas water heater includes heat exchanger and combustor, the combustor includes:

The heat exchanger produces hot water from the heat generated by the burner.

In the technical scheme provided by the utility model, the premixer provides the mixed gas of fuel gas and air; the preheating burner ignites the mixed gas and generates flue gas, so that high-temperature air preheating is realized; and then the gas injection pipe injects gas through the injection port to be matched with the injection port to generate entrainment effect, so that high-temperature flue gas flows back, on one hand, heat preservation is realized, the gas in the combustion chamber can be spontaneously combusted, on the other hand, air is diluted, the oxygen concentration is lower than a certain value, uniform combustion is realized, and thus, high-temperature air combustion is generated in the combustion chamber. And, the utility model provides a combustor with high temperature air combustion function, the structure of this kind of combustor frame, can be with the subassembly miniaturization that realizes high temperature air burning, more application space and value have, it is low to have the noise again in addition, the burning fully reaches the characteristics that discharge exhaust pollution is little, when being applied to gas heater and including using gas combustion production high temperature hot water such as gas hanging stove to carry out relevant products and equipment of use such as family's shower and heating, not only satisfied the requirement, but also brought the burning that the combustor did not possess in the current water heater fully, the effect of low pollutant emission.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic front view of an embodiment of a burner provided by the present invention;

FIG. 2 is a schematic left side view of the burner of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken at A-A of FIG. 2;

fig. 4 is an enlarged schematic view of fig. 3 at B.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model aims at utilizing the characteristic of high temperature air burning, designing neotype combustor to and be applied to gas heater, make gas heater can effectively reduce CO and NOx's emission and reduce gas heater's noise.

The utility model provides a combustor is used at gas heater and including gas hanging stove etc. and uses gas combustion to produce high temperature hot water and carry out relevant product and equipment that uses such as family's shower and heating, following for convenient understanding to be applied to gas heater as an example. Fig. 1 to 4 illustrate an embodiment of a burner according to the present invention.

Referring to fig. 1 to 3, the burner of the present invention includes a housing 1, a pre-mixer 2, a preheating burner 3 and a gas injection pipe 4, wherein the housing 1 is formed with an air inlet chamber 11 and a combustion chamber 12 which are sequentially communicated; the premixer 2 is used for introducing fuel gas and air, premixing the fuel gas and the air, and heating the temperature in the combustion chamber 12 to a preset temperature; the preheating burner 3 is used for igniting the mixed gas in the combustion chamber 12 and heating the temperature in the combustion chamber 12 to a preset temperature; the gas injection pipe 4 has an injection port 41 provided at a side portion of the combustion chamber 12, and the gas injection pipe 4 injects gas into the combustion chamber 12 to perform a high-temperature air combustion reaction in the combustion chamber 12.

The high-temperature air combustion is mainly characterized in that: the chemical reaction needs to take place in a high temperature, low oxygen environment, with the reactants at a temperature above their auto-ignition temperature and the maximum temperature rise during combustion below their auto-ignition temperature, with the oxygen volume fraction being diluted to a very low concentration by the combustion products. Compared with conventional combustion, in the combustion state, the pyrolysis of fuel is inhibited, the flame thickness is thickened, and the flame front surface disappears, so that the temperature of the whole hearth is uniform, the combustion peak temperature is low, the noise is low, and the emission of pollutants NOx and CO is greatly reduced. However, achieving high temperature air combustion requires certain conditions: the oxygen concentration in most areas in the furnace is required to be ensured to be lower than a certain value, generally lower than 5% -10%, the gas is ensured to be fully combusted and uniformly combusted, the temperature is higher than the self-ignition point of the fuel, and the self-ignition is maintained.

In the technical scheme provided by the utility model, the premixer 2 is used for connecting gas and external air and premixing to form more uniform gas and air mixture; the premixer 2 delivers the mixed gas to the combustion chamber 12; the air inlet chamber 11 is used for receiving external air and delivering the air to the combustion chamber 12; the preheating burner 3 ignites the mixed gas in the combustion chamber 12, so that the mixed gas is combusted, high temperature is formed in the region, and the air entering the combustion chamber 12 through the air inlet chamber 11 can be preheated at high temperature to form high-temperature flue gas. It is understood that the air in the combustion chamber 12 can be heated to the target temperature, i.e., the above-mentioned preset temperature, by controlling the heating temperature, so that the high-temperature preheating of the air is realized. The gas injection pipe 4 injects gas into the combustion chamber 12, the gas is ignited by the high-temperature gas and continuously burns in the combustion chamber 12 to form an injection combustion area, and the gas injected according to the preset speed is matched with the high-temperature gas to form an entrainment effect in the combustion chamber 12 to form a gas reflux area, so that part of the high-temperature gas (the waste gas rich in N2 and CO 2) circularly dilutes reactants in the combustion chamber 12, and then the injected gas is fully diluted with air to form a lower oxygen concentration, reduce the combustion reaction speed, continuously maintain a higher temperature in the combustion chamber 12, ensure that the temperature in the combustion chamber 12 is higher than the spontaneous combustion point of the fuel, realize spontaneous combustion, and further realize high-temperature air combustion. Wherein, the injection port 41 is arranged at the side part of the combustion chamber 12, so that the gas injected by the gas injection pipe 4 flows from the side part of the combustion chamber 12 to the middle part of the combustion chamber 12, which is helpful for enhancing the circulation reflux of the flue gas and realizing the heat preservation in the combustion chamber 12.

It should be noted that, this embodiment preheats the air through high temperature and cooperates high-speed efflux to realize entrainment high temperature flue gas and dilution, makes gas and air misce bene in the combustion chamber 12, and the oxygen concentration of combustion chamber 12 also can be balanced simultaneously, and be less than a definite value, so, not only the gas can obtain abundant burning in the time of the burning, and reduced the emission of pollutant, and, also can burn evenly in the combustion chamber 12, the too vigorous and noise-producing problem of local combustion can not appear. In addition, the backflow of high-temperature flue gas is realized through high-speed jet entrainment, the temperature of the combustion chamber 12 can be kept higher than the self-ignition point of fuel, and the combustion can be maintained as long as the fuel gas is continuously introduced. The heat after burning can exchange heat with the heat exchanger of the gas water heater to realize the hot water production. Wherein, the combustion chamber 12 can be provided with a flue gas outlet 13, and the burnt waste gas is discharged through the flue gas outlet 13.

It can be known from the above that the target temperature of the high-temperature preheated air cannot be too low, and cannot be lower than 600 ℃, and generally controlled at 600 to 1200 ℃, so that when the high-temperature gas contacts with the fuel gas in the combustion chamber 12, better automatic combustion is realized, and ignition are no longer needed. The scheme for implementing high-temperature air preheating can be various, and can be implemented by controlling the heating time, controlling the ratio of fuel gas to air, performing heat preservation, increasing the residence time of high-temperature gas in the combustion chamber 12, and the like.

In this embodiment, the oxygen concentration in the combustion chamber 12 is less than 5% to 10%. Because the injection speed of the gas injection pipe 4 is usually determined and set in advance through experiments and basically cannot be changed in the later working process of the combustor, the oxygen concentration in the combustion chamber 12 can be adjusted by adjusting the real-time air inlet amount in the combustion chamber 12, and then the control of the ratio of gas to air is realized. It is not difficult to specifically control the oxygen concentration in the combustion chamber 12, and the detailed description thereof is omitted here. The level of oxygen concentration in the combustion chamber 12 may be controlled based on the size of the combustion chamber 12 and the rate of control injection.

It can be understood that, in this embodiment, owing to provide the mist that contains gas and air through premixer 2, preheat combustor 3 and carry out the burning of igniteing to the mist, high temperature preheated air has been realized, rethread gas injection pipe 4 sprays the gas and cooperates and produce the entrainment effect, make the high temperature flue gas backward flow, realize on the one hand that the heat preservation makes the temperature be higher than the spontaneous combustion point of fuel, make the gas can spontaneous combustion in the combustion chamber, on the other hand through the efflux entrainment dilutes the air, make oxygen concentration be less than a definite value, realize the homogeneous combustion, and so, just make the high temperature air combustion take place in the combustion chamber. That is to say, the technical scheme of this embodiment is favorable to having reached these two conditions simultaneously, realizes smoothly that high temperature air burns. And, the structure of this kind of combustor frame can be with the subassembly miniaturization that realizes the high temperature air burning for have more application space and value, the noise is low in addition, and the burning is abundant, and it is little to discharge waste gas pollution, when being applied to gas heater and including gas hanging stove etc. use gas burning to produce high temperature hot water and carry out relevant products and equipment that use such as family's shower and heating, not only satisfied the requirement, but also brought the abundant, low pollutant emission's of burning that the combustor did not possess in the current water heater effect.

In the above, the preheating burner 3 has the mixed gas distribution chamber 31, the gas inlet of the mixed gas distribution chamber 31 communicates with the premixer 2, and the gas outlet of the mixed gas distribution chamber 31 communicates with the combustion chamber 12. The mixed gas distribution chamber 31 receives the mixed gas of air and fuel gas from the premixer 2 and discharges the mixed gas to the combustor 12.

Of course, the preheating burner 3 can be a fully premixed burner for mixing and burning air and gas sufficiently and uniformly.

The premixer 2 includes a casing 21, a blower 22 and a gas switch valve (not shown in the figure), the casing 21 is formed with an air inlet channel 23, a gas flow channel 24 and a mixing channel (not shown in the figure), the mixing channel is respectively communicated with the air inlet channel 23 and the gas flow channel 24, the blower 22 is arranged in the air inlet channel 23, the gas switch valve is arranged in the gas flow channel 24, and the mixing channel is communicated with an air inlet of the mixed gas distribution chamber 31. The premixer 2 may be disposed inside the air intake chamber 11 or outside the casing 1 of the burner. When the premixer 2 is arranged outside the burner in a split manner, it can be mounted on the casing 1 by means of screw fastening, snap fastening, or adsorption fastening, etc. The fan 22 can be used for adjusting the air flow and the flow speed in the air inlet duct 23; the gas switching valve can be used for closing or opening the gas flow channel 24 according to actual needs, and can also specifically adjust the gas flow rate of the gas flow channel 24, so that the gas switching valve can be matched with the fan 22 to realize the adjustment of the ratio of gas to air in the mixed gas entering the mixed gas distribution chamber 31.

The preheating burner 3 includes a casing 32 forming a mixed gas distribution chamber 31, a combustion assembly 33 provided at an air outlet of the mixed gas distribution chamber 31, and an ignition device 34 provided in the combustion chamber 12 and igniting the combustion assembly 33. The mixed gas distribution chamber 31 provides enough space for the mixed gas to be fully mixed, and is beneficial to smoothening the flow velocity of the mixed gas, so that the mixed gas can flow to the combustion assembly 33 in a uniform and stable state, and full and stable combustion is realized; the combustion assembly 33 may include, for example, a plate-shaped body (not shown in the drawings), and a plurality of through holes (not shown in the drawings) for allowing the mixed gas to pass through are provided in the thickness direction of the plate-shaped body, so as to facilitate uniform combustion of the mixed gas; of course, the specific form of the ignition device 34 is not limited, and the ignition device 34 may be, for example, an electric igniter or an electric heating wire, which will not be described in detail herein. It should be noted that the ignition device 34 is disposed closer to the combustion assembly 33 so that the mixture gas entering the combustion chamber 12 from the mixture gas distribution chamber 31 can be ignited quickly without loss.

Referring to fig. 3, in an embodiment, the gas inlet of the mixed gas distribution chamber 31 is flared toward the gas outlet of the mixed gas distribution chamber 31. Approximately corresponds to the cross-sectional area of the mixed gas distribution chamber 31 at least near the gas inlet chamber section, and is gradually increased from the gas inlet of the mixed gas distribution chamber 31 to the gas outlet of the mixed gas distribution chamber 31. Specifically, the cross-sectional area of the communication part of the mixed gas distribution chamber 31 and the pre-mixer 2 is set to be smaller, so that the flow speed of the mixed gas entering the mixed gas distribution chamber 31 through the pre-mixer 2 is increased, the circulation speed of the mixed gas is improved, and the mixed gas enters the mixed gas distribution chamber 31 quickly; then, as the mixed gas continues to flow, the cross-sectional area of the mixed gas distribution chamber 31 gradually increases within a certain range, which helps to gradually reduce the flow rate of the mixed gas, so that the state of the mixed gas is gradually gentle, and sufficient time can be reserved for the mixed gas to be sufficiently mixed.

Further, in the above embodiment, the burner further comprises a flame sensing device 35, the flame sensing device 35 is disposed in the combustion chamber 12 and close to the preheating burner 3, and the flame sensing device 35 is used for detecting whether the preheating burner 3 is in a combustion state and controlling the preheating burner 3 to re-ignite when detecting that the preheating burner is not in the combustion state. Through setting up flame induction system 35, can carry out real-time supervision to the combustion state of burning subassembly 33, the combustion state for example is burning flame size, combustion range and combustion temperature etc. helps in time judging whether unusual appears in the combustion state, ensures preheating combustor 3's normal work, and helps guaranteeing the high temperature air combustion quality in the combustion chamber 12.

Then, in order to further ensure that the combustion temperature in the combustion chamber 12 is higher than the self-ignition point of the fuel, in an embodiment, the burner further comprises a temperature measuring device 36, the temperature measuring device 36 is disposed in the combustion chamber 12, and the temperature measuring device 36 is used for detecting whether the temperature in the combustion chamber 12 reaches a preset target temperature. By monitoring the temperature measuring device 36 in real time, when the temperature in the combustion chamber 12 is monitored to be abnormal, the user can be reminded or the temperature can be fed back to the control device of the combustor for processing.

It will be appreciated that in one embodiment, the burner may additionally be provided with a control device which may be separate from or part of the control system of the gas water heater. The control device of the burner can be electrically connected with the flame sensing device 35, the ignition device 34, the temperature measuring device 36 and the like in the above embodiment, so that the flame sensing device 35, the ignition device 34, the temperature measuring device 36 and the like can be automatically controlled, and the intellectualization of the burner is realized. The control device may be a control chip or a control circuit, which is not described herein.

Further, in the above embodiment, the temperature measuring device 36 is disposed near the flue gas outlet 13. The measurement result of the temperature measuring device 36 is prevented from being influenced by the combustion assembly 33 or the ignition device 34, and the accuracy of the sensing result is improved. In application, when the temperature of the gas in the combustion chamber 12 does not reach the target temperature, i.e. the combustion imbalance in the combustion chamber 12 is represented, the air intake amount of the air entering the combustion chamber 12 from the air inlet chamber 11 or the ratio of the gas and the air entering the combustion chamber 12 from the preheating burner 3 can be adjusted. When the temperature of the gas in the combustion chamber 12 reaches the target temperature, namely the combustion in the combustion chamber 12 is represented to be normal, the full proceeding of the high-temperature air combustion in the combustion chamber 12 can be ensured, and the low CO & NOX emission in the whole combustion process is ensured.

Referring to fig. 3 and 4, in an embodiment, the burner further includes an air duct housing 14, and the air duct housing 14 is disposed around the outer peripheral side of the housing 1 to form an air inlet chamber 11 together with the housing 1. The air inlet chamber 11 is used for receiving external air and providing enough space for air to flow smoothly; the arrangement of the air inlet chamber 11 at the side of the housing 1 ensures a compact overall structure of the burner, while the air inlet chamber 11 can be arranged at a desired location in the burner so that air can rapidly enter the combustion chamber 12 via the air inlet chamber 11.

Further, in one embodiment, the air intake chamber 11 has a blow port 111 provided at a side portion of the combustion chamber 12, and the blow port 111 is provided near the combustion block 33. So, air intake chamber 11 can reach combustion assembly 33 department fast through the air in supply-air outlet 111 entering combustion chamber 12, realizes high temperature preheating fast under combustion assembly 33's combustion effect, avoids the air that the temperature did not reach preset target temperature middle part and top region diffusion in combustion chamber 12, influences high temperature air combustion effect.

Further, in the above embodiment, the plurality of air blowing ports 111 of the air intake chamber 11 are arranged at intervals in the circumferential direction of the combustion chamber 12. So set up for the air that gets into combustion chamber 12 through air intake chamber 11 can evenly disperse in combustion assembly 33's week side, is favorable to increasing the area of contact between the combustion zone of air and combustion assembly 33, also increases the heated area of air promptly, improves the efficiency that the air high temperature preheats.

Next, in this embodiment, the gas injection pipe 4 has the injection port 41, the gas injection pipe 4 injects the gas into the combustion chamber 12 through the injection port 41, the injection ports 41 are arranged in plurality at intervals along the circumferential direction of the combustion chamber 12, so that the gas in the combustion chamber 12 can be subjected to high-speed jet flow from a plurality of directions, so that more flue gas is intensively circulated in the combustion chamber 12, and then the gas in the combustion chamber 12 is sufficiently diluted to form a lower oxygen concentration, reduce the combustion reaction speed, maintain a higher temperature in the combustion chamber 12, ensure that the temperature in the combustion chamber 12 is higher than the self-ignition point of the fuel, realize self-ignition, and ensure that the combustion of the high-temperature air in the combustion chamber 12 is sufficiently performed.

In an embodiment, the gas injection pipe 4 is configured to enable the gas injected through the injection port 41 to be in a vortex shape in the combustion chamber 12, and the gas can drive the flue gas in the combustion chamber 12 to circulate in a vortex shape, so as to help to prolong a backflow path of the flue gas in the combustion chamber 12, enhance a circulation backflow effect of the flue gas in the combustion chamber 12, and achieve good heat preservation in the combustion chamber 12. It can be understood that there are various technical solutions for realizing the gas injected from the injection port 41 to be in a spiral shape in the combustion chamber 12, wherein, for example, the gas injection pipe 4 is arranged to periodically inject the gas, so that the gas entering the combustion chamber 12 through the injection port 41 periodically flows, and a pressure difference is generated in the combustion chamber 12 to form a spiral gas flow; alternatively, by providing the gas injection pipe 4 with a plurality of injection ports 41, and arranging the plurality of injection ports 41 at intervals substantially along the outer periphery of an annular plane, each injection port 41 is arranged in a tangential direction of the annular outer periphery substantially at the position, so that the gas entering the combustion chamber 12 through the plurality of injection ports 41 flows along a spiral path.

In one embodiment, the gas injection pipe 4 has a passage section 42 connected to the injection port 41; the passage section 42 is inclined in a direction approaching the injection port 41 and gradually moving away from the flue gas outlet 13. The passage section 42 may be formed on the main body of the gas injection pipe 4, or may be formed on the casing 1 communicating with the gas injection pipe 4; the inclined arrangement of the channel section 42 enables the fuel gas sprayed by the fuel gas spraying pipe 4 to flow in the direction far away from the flue gas outlet 13, so that the flue gas in the combustion chamber 12 is driven to circulate at the position far away from the flue gas outlet 13, the backflow path of the flue gas is prolonged, and the heat preservation in the combustion chamber 12 is also facilitated.

The injection port 41 of the gas injection pipe 4 is arranged at the side of the combustion chamber 12, and in one embodiment, at least a part of the pipe section of the gas injection pipe 4 close to the injection port 41 is accommodated in the combustion chamber 12 and is arranged at the side of the combustion chamber 12; alternatively, as in the present embodiment, the gas injection pipe 4 may be provided around the outer peripheral side portion of the casing 1; the injection port 41 of the gas injection pipe 4 is provided in the combustion chamber 12 after passing through the casing 1. Thus, the main body part of the gas injection pipe 4 is arranged outside the shell 1, does not occupy the space in the combustion chamber 12, and provides a sufficient circulation area for the flue gas in the combustion chamber 12; the main body portion of the gas injection pipe 4 substantially forms a distribution chamber for the gas for uniform distribution of the gas, so that the velocity and flow rate of the gas injected through each injection port 41 are uniformly stabilized.

Referring to fig. 1, 3 and 4, in one embodiment, the combustion chamber 12 includes a first combustion chamber (not shown) and a second combustion chamber (not shown) which are connected in sequence; the first combustion chamber is respectively communicated with the air outlet of the mixed gas distribution chamber 31 and the air outlet of the air inlet chamber 11; the second combustion chamber communicates with the injection port 41 of the gas injection pipe 4. The first combustion chamber is used for fully combusting the mixed gas discharged from the mixed gas distribution chamber 31 to generate enough temperature for high-temperature preheating of the air discharged from the air inlet chamber 11 to reach the preset target temperature; the gas jetted by the gas jet pipe 4 in the second combustion chamber is jetted at high speed, so that high-temperature air combustion is formed in the second combustion chamber.

The housing 1 forming the first combustion chamber and the second combustion chamber may be integrally formed or may be separately formed, and in one embodiment, the housing 1 includes a first housing 121 forming the first combustion chamber and a second housing 122 forming the second combustion chamber; the first housing 121 is detachably connected to the second housing 122. The connection mode of the first casing 121 and the second casing 122 may be a snap fixation, a screw fixation, an adhesive fixation, an adsorption fixation, or the like; a sealing structure may be disposed at the joint of the first casing 121 and the second casing 122 to ensure the sealing connection therebetween, so as to prevent the gas in the combustion chamber 12 from leaking; the detachable connection of the first casing 121 and the second casing 122 facilitates the disassembly, assembly and replacement of the two, and is easier for maintenance of the burner.

Furthermore, the utility model provides a gas heater, gas heater include heat exchanger 53 and as above the combustor, of course, gas heater still includes the main part, is provided with heat transfer chamber 51 in the main part and reaches the exhaust port 52 with heat exchanger 53 intercommunication, and heat exchanger 53 sets up in heat transfer chamber 51, the exhanst gas outlet 13 and the heat transfer chamber 51 intercommunication of combustor. The heat exchanger 53 is connected to an external water source, such as tap water, and the high-temperature flue gas entering the heat exchange chamber 51 through the flue gas outlet 13 of the burner carries enough heat to continuously exchange heat with the water in the heat exchanger 53, so that the temperature of the water is increased to be required, and hot water is prepared.

In order to enhance the heat exchange effect of the flue gas to the heat exchanger 53, in an embodiment, the heat exchanger 53 includes heat exchange tubes, and the heat exchange tubes are arranged in the heat exchange chamber 51 in a stacking and winding manner along the flue gas flowing direction. The direction of the smoke flow is also from the smoke outlet 13 to the smoke outlet 52. The heat exchange tube is arranged in the flowing direction of the high-temperature flue gas, so that the high-temperature flue gas can be fully contacted with the heat exchange tube in the flowing process, and the heat exchange purpose is realized; the heat exchange tubes are arranged in a winding mode in a stacked mode, so that the contact area of tap water and high-temperature flue gas in the heat exchange tubes is enlarged, and the heat exchange effect is optimized.

It should be noted that, the detailed structure of the burner in the gas water heater can refer to the above-mentioned embodiment of the burner, and is not described herein again; because the utility model discloses above-mentioned combustor has been used among the gas heater, consequently, the utility model discloses gas heater's embodiment includes all technical scheme of the whole embodiments of above-mentioned combustor, and the technological effect that reaches is also identical, no longer gives unnecessary details here.

Claims

1. A burner, comprising:

2. The combustor of claim 1, wherein said injection ports are arranged in plurality at intervals in a circumferential direction of said combustion chamber.

3. The burner of claim 1, wherein the gas injection tube is arranged such that gas injected through the injection port swirls within the combustion chamber.

4. The burner of claim 1, wherein the combustion chamber has a flue gas outlet, the gas injection tube having a passage section connecting the injection ports;

5. The burner according to any one of claims 1 to 4, wherein the gas injection pipe is annularly provided to a peripheral side portion of the housing;

6. The burner according to claim 1, wherein the air intake chamber has a plurality of air blowing ports provided in a side portion of the combustion chamber, and the plurality of air blowing ports are arranged at intervals in a circumferential direction of the combustion chamber.

7. The burner of claim 6, further comprising a duct housing disposed around a peripheral side portion of the housing to form the air intake chamber in cooperation with the housing at the location.

8. The burner of claim 1, wherein the preheat burner has a mixed gas distribution plenum, an inlet of the mixed gas distribution plenum communicating with the premixer, and an outlet of the mixed gas distribution plenum communicating with the combustion chamber.

9. The burner of claim 8, wherein the preheat burner comprises a housing forming the mixed gas distribution chamber, a combustion assembly disposed at an outlet of the mixed gas distribution chamber, and an ignition device disposed within the combustion chamber and configured to ignite the combustion assembly.

10. The burner of claim 9, wherein the air intake chamber has a supply air outlet provided at a side portion of the combustion chamber, the supply air outlet being provided adjacent to the combustion assembly.

11. The burner of claim 8, wherein the gas inlet of the mixed gas distribution chamber is flared in a direction toward the gas outlet of the mixed gas distribution chamber.

12. The burner of claim 8, wherein the combustion chamber comprises a first combustion chamber and a second combustion chamber in series communication;

13. The burner of claim 12, wherein the housing comprises a first housing forming the first combustion chamber, and a second housing forming the second combustion chamber;

the first shell is detachably connected with the second shell.

14. The burner of claim 1, further comprising a flame sensing device disposed within the combustion chamber and proximate to the preheating burner, the flame sensing device being configured to detect whether the preheating burner is in a burning state and to control the preheating burner to re-ignite when a non-burning state is detected.

15. The burner of claim 1, further comprising a temperature measuring device disposed within the combustion chamber, the temperature measuring device configured to detect whether a temperature within the combustion chamber reaches a predetermined target temperature.

16. The burner of claim 8, wherein the premixer includes a housing formed with an inlet air duct, a gas flow duct, and a mixing passage communicating with the inlet air duct and the gas flow duct, respectively, a fan provided in the inlet air duct, and a gas switching valve provided in the gas flow duct, the mixing passage communicating with the gas inlet of the mixed gas distribution chamber.

17. The combustor of claim 1, wherein said preheat combustor is a fully premixed combustor.

18. A gas water heater comprising a heat exchanger and a burner as claimed in any one of claims 1 to 17, said heat exchanger producing hot water from heat generated by said burner.