CN218846140U - Water-cooled combustor and gas heater - Google Patents

Abstract

The utility model belongs to the technical field of gas heater, a water-cooling combustor and gas heater are disclosed. The water-cooled burner comprises a fire hole part, a profiling part and a cooling water pipe, wherein the fire hole part is provided with a plurality of fire holes, the profiling part is provided with two profiling parts, the two profiling parts are symmetrically arranged at two sides of the fire hole part, the profiling part is provided with an injection channel, and the air outlet end of the injection channel is communicated with the plurality of fire holes; the side wall of the injection passage is provided with a first mounting hole which is communicated with the injection passage and is positioned at the air outlet end of the injection passage; the cooling water pipe is arranged in the first mounting hole in a penetrating mode. The utility model discloses a set up first mounting hole in the end of giving vent to anger of drawing the passageway and be used for installing condenser tube for the outer wall of condenser tube can directly carry out the contact cooling with the premix gas in drawing the passageway, realizes cooling down the die mould portion and premix gas simultaneously, and the cooling effect is good; the premixed gas is cooled and then enters the fire hole part for combustion, so that the flame temperature is relatively lower, and the emission of nitrogen oxides is lower.

Description

Water-cooled combustor and gas heater

Technical Field

The utility model relates to a gas heater technical field especially relates to a water-cooled combustor and gas heater.

Background

The water-cooled burner can take away heat on the upper part of the burner through cold water, so that the local temperature of the bottom area of burning flame on the upper part of the burner is reduced, and the water-cooled burner is applied to a gas water heater to realize low-nitrogen emission, energy conservation and environmental protection.

The existing water-cooled burner is mainly composed of a fire hole plate, a shell and a water pipe. The fire hole plate and the shell are made of different materials, the folded edge of the fire hole plate is tightly pressed with the turned edge of the shell, so that heat of the fire hole plate is transferred to the shell through surface contact, and then is transferred to the water pipe from the shell.

The existing water-cooling burner has the following problems: if the contact is poor, the connection resistance at the connection part is greatly increased, so that the heat of the fire hole plate can not be dissipated in time during working, and the problems of tempering and the like which influence the working performance are caused; because condenser tube sets up around the fire hole board, realizes cooling through condenser tube and casing direct contact's mode, condenser tube can only cool off the casing, and unable cooling mixes gas in advance, leads to the water-cooling effect unsatisfactory.

SUMMERY OF THE UTILITY MODEL

One of the technical problems solved by the present invention is to provide a water-cooled burner, which can effectively solve the problem that the cooling water pipe can only cool the housing and can not directly cool the cooling effect difference caused by the premixed gas.

The second technical problem solved by the present invention is to provide a gas water heater, which can effectively solve the problem that the cooling effect of the water-cooled burner is poor because the shell can only be cooled and the premixed gas can not be directly cooled.

The first technical problem mentioned above is solved by the following technical solutions:

a water-cooled burner comprising:

a fire hole portion provided with a plurality of fire holes,

the two profiling parts are symmetrically arranged on two sides of the fire hole part and are provided with ejection channels, and the air outlet ends of the ejection channels are communicated with the fire holes; the side wall of the injection passage is provided with a first mounting hole, and the first mounting hole is communicated with the injection passage and is positioned at the air outlet end of the injection passage;

and the cooling water pipe is arranged in the first mounting hole in a penetrating manner.

Water-cooled combustor, compare with the background art, the beneficial effect who has does:

the utility model discloses a set up first mounting hole in the end of giving vent to anger of drawing the passageway and be used for installing condenser tube, make the outer wall of condenser tube directly carry out the contact cooling with drawing the gas in the passageway and the premix gas of air, realized cooling down when pressing type portion and inside premix gas, the cooling effect is good; the premixed gas is cooled and then enters the fire hole part for combustion, so that the flame temperature is relatively lower, and the emission of nitrogen oxides is lower.

In one embodiment, the profiling portion is provided with a second mounting hole, the second mounting hole is formed in the profiling portion at a position independent of the injection passage, and the cooling water pipe penetrates between the first mounting hole and the second mounting hole.

In one embodiment, the vertical distance between the first mounting hole and the fire hole is 10-15mm.

In one embodiment, the injection passage comprises a contraction section, a mixing section and a cooling section which are sequentially communicated from an air inlet end to an air outlet end, fuel gas can enter the mixing section from the contraction section and is mixed with air in the mixing section to form premixed gas and enters the cooling section, the cooling section is communicated with the fire hole, and the first mounting hole is arranged in the cooling section and is in direct communication with the cooling section.

In one embodiment, the cooling section of each injection passage is provided with at least two cooling water pipes, and the at least two cooling water pipes are arranged on two sides of a central line of the injection passage.

In one embodiment, at least two injection passages are provided, and the cooling sections of two adjacent injection passages are communicated.

In one embodiment, the number of the injection passages is at least two, the cooling sections of all the injection passages are mutually independent, the fire holes are divided into multiple groups, and the fire holes in each group are arranged in one-to-one correspondence with the cooling sections.

In one embodiment, the fire hole is a long hole or a round hole, and the minor axis of the long hole or the diameter of the round hole is 0.8-1.2mm.

In one embodiment, the fire hole part and the profiling part are of an integrated structure, and the two profiling parts are folded and formed oppositely relative to the fire hole part to form the injection passage.

The second technical problem is solved by the following technical scheme:

the utility model provides a gas water heater, includes in any one of the above-mentioned scheme water-cooled burner, water-cooled burner is equipped with a plurality ofly, and is a plurality of the assembly is hugged closely to water-cooled burner, and condenser tube wears to establish a plurality ofly on the water-cooled burner.

Gas heater, compare with the background art, the beneficial effect who has is:

the utility model discloses a gas water heater includes the utility model provides a water-cooled burner, water-cooled burner's cooling water pipe setting can cool off die mould portion and premixed gas simultaneously in drawing penetrating the passageway, and the cooling effect is good, does benefit to the combustion temperature who reduces premixed gas, and then reduces nitrogen oxide's production.

Drawings

Fig. 1 is a schematic view of an expanded structure of a water-cooled burner according to the present invention;

FIG. 2 is a schematic view of a first single structure of the water-cooled burner of the present invention;

FIG. 3 is a schematic view (partially cut away) of the arrangement structure of the cooling water pipe on the water-cooled burner of the present invention;

FIG. 4 is a schematic side view of the water-cooled burner of the present invention;

fig. 5 is a schematic side view of the water-cooled burner of the present invention;

FIG. 6 is a schematic view showing the positions of the water inlet pipe and the elbow pipe in the water-cooled burner of the present invention;

FIG. 7 is a schematic view of a second single structure of the water-cooled burner of the present invention;

fig. 8 is an enlarged view of the area a in fig. 7.

Description of reference numerals:

1. a fire hole portion; 11. fire holes;

2. a profiling part; 21. an injection passage; 211. a contraction section; 212. a mixing section; 213. a cooling section; 22. a first mounting hole; 23. a welding point; 24. a first flanging; 25. a second mounting hole;

3. a cooling water pipe; 31. a water inlet pipe; 32. a water outlet pipe; 33. and (5) bending the pipe.

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 work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

in the first embodiment, as shown in fig. 1 to 3, the water-cooled burner includes a fire hole portion 1, a profiling portion 2 and a cooling water pipe 3, the fire hole portion 1 is provided with a plurality of fire holes 11, the profiling portion 2 is provided with two, and the two profiling portions 2 are symmetrically arranged at two sides of the fire hole portion 1. As shown in fig. 1, the two profiling parts 2 are folded and formed oppositely relative to the fire hole part 1 and are adhered and tightly connected to form an injection channel 21, and as shown in fig. 2, the air outlet end of the injection channel 21 is communicated with a plurality of fire holes 11; a first mounting hole 22 is formed in the side wall of the injection passage 21, and the first mounting hole 22 is communicated with the injection passage 21 and is positioned at the air outlet end of the injection passage 21; as shown in fig. 3, the cooling water pipe 3 is inserted into the first mounting hole 22.

It should be explained that, the water-cooled burner provided by the present embodiment is used in a gas water heater to reduce the combustion temperature during the combustion of gas, thereby reducing the generation of nitrogen oxides. As shown in fig. 3, the gas water heater includes a plurality of water-cooled water heaters disposed in close contact with each other, and the cooling water pipe 3 penetrates through the plurality of water-cooled burners. Fire hole 11 evenly distributed forms the fire row on the fire hole portion 1, and the die mould portion 2 of both sides obtains drawing of two half shells through the mode of die mould and penetrates passageway 21, and 2 back butt joints of buckling of two die mould portions are sealed, form the complete passageway 21 that penetrates, draw one side that penetrates passageway 21 and deviate from fire hole 11 to be the inlet end, and the end of giving vent to anger is held for giving vent to anger towards drawing one side of penetrating passageway 21, and the end of giving vent to anger directly communicates fire hole 11. In the embodiment, the first mounting hole 22 is formed at the air outlet end (i.e., the end facing the fire hole 11) of the injection passage 21 and used for mounting the cooling water pipe 3, so that the outer wall of the cooling water pipe 3 can be directly contacted and cooled with the premixed gas of the fuel gas and the air in the injection passage 21, the compression part 2 and the premixed gas in the compression part can be simultaneously cooled, and the cooling effect is good; the premixed gas is cooled and enters the fire hole part 1 for combustion, so that the flame temperature is relatively lower, and the emission of nitrogen oxides is lower.

It is supplementary to explain that, in order to improve the joint strength between two die mould portions 2 and draw the sealing performance of penetrating passageway 21, as shown in fig. 4, set up a plurality of welding points 23 around drawing the circumference of penetrating passageway 21 on two die mould portions 2, carry out welded connection through a plurality of welding points 23 between two die mould portions 21, can increase the laminating degree between two die mould portions 2, improve the leakproofness and the joint strength of penetrating passageway 21, ensure to draw the smooth circulation of gas and air in the passageway 21. As shown in fig. 4 and 5, the side edges of the two profiling parts 2 are respectively provided with a first flange 24, and the first flanges 24 at opposite positions are mutually covered and connected to ensure that the two profiling parts 2 and the fire hole part 1 are integrated. Of course, other ways of joining the components by welding may be selected, and this is only an exemplary illustration.

In one embodiment, the profiling portion 2 is provided with a second mounting hole 25, the second mounting hole 25 is arranged on the side wall of the injection passage 21 to be communicated with the injection passage 21, or is arranged on the profiling portion 2 at a position independent of the injection passage 21, and the cooling water pipe 3 is arranged between the first mounting hole 22 and the second mounting hole 25 in a penetrating manner.

Fig. 2 shows an example in which the second mounting hole 25 is provided at a position on the die-cut portion 2 independent of the injection passage 21. When the pressed portion 2 has two injection passages 21, the second mounting hole 25 is provided between the two injection passages 21. The cooling water pipe 3 is inserted between the first mounting hole 22 and the second mounting hole 25.

As shown in fig. 3 and 6, the cooling water pipes 3 are straight pipes, two adjacent cooling water pipes 3 are connected through a bent pipe 33, the cooling water pipes 3 at two ends are respectively connected with a water inlet pipe 31 and a water outlet pipe 32, one end of the water inlet pipe 31 is connected with a cold water source, the other end of the water inlet pipe is connected with the cooling water pipes 3 penetrating through the plurality of water-cooled burners through a first mounting hole 22 on one side of the profiling part 2, the plurality of cooling water pipes 3 are parallel to each other, and two ends of the cooling water pipes 3 are connected through the bent pipe 33 at the first mounting hole 22 to form a through cooling channel. One end of the last bent pipe 33 is connected with the cooling water pipe 3, and the other end of the last bent pipe penetrates through the second mounting hole 25 and is connected with the water outlet pipe 32, so that the cooling water pipe 3 penetrates through the injection passage 21 and can be directly contacted with premixed gas in the injection passage 21 to play a role in cooling the premixed gas; simultaneously, because condenser tube 3 is sealed with die mould portion 2 direct contact in first mounting hole 22 and second mounting hole 25 department, consequently condenser tube 3 plays the lateral wall contact cooling effect to die mould portion 2, and it is thus clear that this embodiment has simultaneously the effect of cooling die mould portion 2 and premixed gas through setting condenser tube 3 in drawing penetrating passageway 21, and the cooling effect is good, does benefit to and reduces gas combustion temperature, and then reduces nitrogen oxide's production. It should be noted that, in general, the second mounting hole 25 is disposed at a position between the two injection passages 21, and is not communicated with the injection passages 21, and the water outlet pipe 32 is disposed through the second mounting hole 25 for discharging the medium after heat exchange. When the cooling water pipe 3 has insufficient cooling capacity, the second mounting hole 25 can be arranged on the side wall of the communicating injection passage 21 and communicated with the injection passage 21, so that the water outlet pipe 32 penetrates through the injection passage 21 and can be further cooled by gas contact in the injection passage 21, and the cooling effect is enhanced.

In one embodiment, the vertical distance between the first mounting hole 22 and the fire hole 11 is 10-15mm.

As shown in fig. 2, the injection passage 21 of the first mounting hole 22 faces the air outlet end of one side of the fire hole 11, and generally, the injection passage 21 is in a T-shaped structure, and the air outlet end of the injection passage 21 has a relatively large pressure stabilizing space, so that the cooling water pipe 3 is convenient to mount. The cooling water pipe 3 sets up near being close to fire hole 11 so that the gas that mixes in advance before the burning has cooled off, do benefit to and reduce combustion temperature, reduce nitrogen oxide's production, if cooling water pipe 3 is too near with fire hole 11 position, can influence the discharge of gas that mixes in advance, if too far away, can not play the cooling effect of ideal, this embodiment is preferred to set up cooling water pipe 3 in cooling water pipe 3's central distance apart from the plane 10-15 mm's of fire hole portion 1 position, can play the purpose of cooling die mould portion 2 body and gas that mixes in advance simultaneously, the cooling effect is good.

In one embodiment, the injection passage 21 is provided with a contraction section 211, a mixing section 212 and a cooling section 213 from an air inlet end to an air outlet end in sequence, fuel gas can enter the mixing section 212 from the contraction section 211 and is mixed with air in the mixing section 212 to form premixed gas and enters the cooling section 213, the cooling section 213 is communicated with the fire hole 11, and the first mounting hole 22 is arranged in the cooling section 213 and is communicated with the cooling section 213.

As shown in fig. 4, the injection passage 21 is formed by pressing in the pressing section 2, and the gas is injected into the water-cooled burner at a high speed from the inlet of the constricted section 211 and entrains air. The outlet of the contraction section 211 is connected to the inlet of the mixing section 212, the gas and the air are rapidly mixed in the mixing section 212 to form premixed gas, and the premixed gas flows into the cooling section 213, and the cooling section 213 is also called a pressure stabilizing section and has a larger aperture relative to the mixing section 212 so as to facilitate pressure stabilization. The outlet of the cooling section 213 is connected with the fire hole 11, and the premixed gas flows out of the cooling section 213 and flows out of the water-cooled burner through the fire hole 11. It can be seen that the premixed gas enters the cooling section 213 from the mixing section 212, stabilizes the pressure and flows out of the combustion at the fire holes 11, so that the cooling effect of the cooling section 213 directly affects the combustion temperature. In the prior art, the cooling water pipe 3 contacting with the outer wall is arranged outside the cooling section 213, and the premixed gas can be conducted and cooled only by cooling the outer wall, but cannot be directly cooled, so that the cooling effect is limited. The cooling water pipe 3 is arranged in the cooling section 213 in the embodiment, so that the outer wall of the cooling water pipe 3 can be directly contacted with the premixed gas, and the cooling effect on the premixed gas is greatly improved compared with the prior art. Certainly, under the condition that the space structure allows, a group of cooling water pipes 3 can still be arranged outside the injection passage 21, and the cooling water pipes 23 are arranged inside and outside the injection passage 21 to perform comprehensive cooling. The method can be specifically set according to actual needs.

In one embodiment, the cooling section 213 of each injection passage 21 is provided with at least two cooling water pipes 3, and the at least two cooling water pipes 3 are symmetrically arranged on two sides of the midline of the injection passage 21.

As shown in the embodiments of fig. 1 to 4, two injection passages 21 are arranged in parallel on each water-cooled burner, two first mounting holes 22 are symmetrically arranged on the side walls of the two sides of the cooling section 213 with respect to the center of the injection passage 21, the cooling water pipes 3 are arranged in the first mounting holes 22 in a penetrating manner to perform direct contact cooling on the premixed gas in the cooling section 213, and meanwhile, the two sections of cooling water pipes 3 are uniformly distributed in the cooling section 213, so that the cooling section 213 has uniform temperature and stable combustion. The cooling water pipe 3 penetrates through the two sides of the central line of the injection passage 21, so that the flow channel resistance caused by the cooling water pipe 3 can be reduced; meanwhile, the ejector can be prevented from being influenced by the condensed water.

In one embodiment, the injection passage 21 is provided with a plurality of cooling sections 213, and the plurality of cooling sections 213 of the plurality of injection passages 21 are communicated with each other.

As shown in fig. 2, the cooling sections 213 of the two injection passages 21 are communicated with each other, that is, the cooling section 213 is shared, and the four cooling water pipes 3 can be uniformly distributed in the cavity between the shared cooling section 213 and the fire hole 11, so as to facilitate rapid pressure stabilization and temperature reduction of premixed gas, and provide stable premixed gas at low temperature, so as to obtain stable low-temperature combustion flame.

In one embodiment, the cooling sections 213 of the injection passages 21 are independent of each other, the fire holes 11 of the fire hole portion 1 are divided into a plurality of groups, and the fire holes 11 of each group are arranged in one-to-one correspondence with the cooling sections 213.

As shown in fig. 7, two of water-cooled combustor draw and penetrate passageway 21 mutually independent, and two cooling sections 213 communicate a set of fire hole 11 respectively, and every cooling section 213 symmetry sets up two first mounting holes 22 and is used for installing condenser tube 3, during the use, through the gas of control nozzle, can make each draw and penetrate passageway 21 and can independent work to realize the segmentation combination burning of water-cooled combustor, can effectively increase load regulation ratio, promote the user experience travelling comfort.

In one embodiment, the fire holes 11 are elongated or circular holes, and the minor axis of the elongated or circular holes has a diameter of 0.8-1.2mm. As shown in fig. 8, the long holes have a minor axis of 0.8-1.2mm, and are parallel to each other and uniformly spaced, and the long holes are perpendicular to the major axis of the fire hole part 1, so that the combustion efficiency is high. The elongated or circular holes are more conducive to the formation of a stable combustion flame than the rectangular fire holes 11 of the prior art.

In one embodiment, the fire hole part 1 and the profiling part 2 are of an integral structure.

Specifically, as shown in fig. 1, the fire hole portion 1 is located between two pressed portions 2, and can be obtained by pressing and pressing a plate, and the fire hole portion 1 and the pressed portions 2 are made of stainless steel or copper material of the same material, are not easily oxidized, and are relatively stable in the presence of water. Compared with the prior art, the heat conduction type heat conduction device solves the problems of uneven heat conduction and easy corrosion which are possibly caused when the fire hole part 1 and the profiling part 2 which are made of different materials are in contact connection, and the integral piece reduces the number of assembly parts, thereby reducing the thermal resistance; meanwhile, the production efficiency can be improved, and the labor cost can be reduced.

It is supplementary to explain, the utility model discloses an among the water-cooled combustor, first mounting hole 22 and second mounting hole 25 are the flanging hole, and the unilateral of first mounting hole 22 and second mounting hole 25 has the second turn-ups towards die mould portion 2 one side and perpendicular to die mould portion 2 promptly, and the second turn-ups can provide the installation direction for condenser tube 3, can increase die mould portion 2 and condenser tube 3's area of contact simultaneously, improves the cooling effect.

Example two:

a gas water heater comprises a plurality of water-cooled combustors, wherein the plurality of water-cooled combustors are closely assembled, and cooling water pipes 3 penetrate through the plurality of water-cooled combustors.

As shown in fig. 3, the gas water heater includes a plurality of water-cooled burners tightly attached to each other, the cooling water pipe 3 can run through the plurality of water-cooled burners, the two ends of the cooling water pipe are communicated with each other through a bent pipe 33, one end of the cooling water pipe is provided with a water inlet pipe 31, the other end of the cooling water pipe is provided with a water outlet pipe 32, and the water outlet pipe 32 is provided with a gasket so as to be externally connected in a sealing manner. The adjacent two water-cooled combustors are tightly assembled, the gap is small, and the problem of smoke leakage caused by leakage of the insufficiently combusted premixed gas from the gap can be effectively prevented.

The utility model discloses a gas water heater, through adopting the utility model discloses implement a water-cooled burner that provides, can cool off gas premix and die mould portion 2 simultaneously, have stronger cooling effect for prior art, do benefit to the combustion temperature who reduces gas premix, and then reduce nitrogen oxide's production, economic environmental protection.

In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The details of the foregoing embodiments are merely representative of several embodiments of the present invention, which are described in more detail and detail, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A water-cooled combustor, comprising:

a fire hole part (1), wherein the fire hole part (1) is provided with a plurality of fire holes (11);

the two compression parts (2) are arranged, the two compression parts (2) are symmetrically arranged on two sides of the fire hole part (1), the compression part (2) is provided with an injection channel (21), and the air outlet end of the injection channel (21) is communicated with the fire holes (11); a first mounting hole (22) is formed in the side wall of the injection passage (21), and the first mounting hole (22) is communicated with the injection passage (21) and is located at the air outlet end of the injection passage (21);

the cooling water pipe (3) penetrates through the first mounting hole (22).

2. The water-cooled burner according to claim 1, characterized in that the profiled section (2) is provided with a second mounting hole (25), the second mounting hole (25) is provided at a position on the profiled section (2) independent of the injection passage (21), and the cooling water pipe (3) is inserted between the first mounting hole (22) and the second mounting hole (25).

3. A water-cooled burner according to claim 1, characterized in that the vertical distance between the first mounting hole (22) and the fire hole (11) is 10-15mm.

4. The water-cooled burner as recited in claim 1, wherein the injection passage (21) comprises a contraction section (211), a mixing section (212) and a cooling section (213) which are sequentially communicated from an air inlet end to an air outlet end, gas can enter the mixing section (212) from the contraction section (211) and is mixed with air in the mixing section (212) to form premixed gas, and enters the cooling section (213), the cooling section (213) is communicated with the fire hole (11), and the first mounting hole (22) is in direct communication with the cooling section (213).

5. The water-cooled burner according to claim 4, characterized in that the cooling section (213) of each injection channel (21) is provided with at least two cooling water pipes (3), and at least two cooling water pipes (3) are arranged on both sides of the center line of the injection channel (21).

6. The water-cooled burner according to claim 4, characterized in that the number of the injection passages (21) is at least two, and the cooling sections (213) of two adjacent injection passages (21) are communicated with each other.

7. The water-cooled burner according to claim 4, characterized in that the number of the injection passages (21) is at least two, the cooling sections (213) of all the injection passages (21) are mutually independent, the plurality of fire holes (11) are divided into a plurality of groups, and the plurality of fire holes (11) of each group are arranged in one-to-one correspondence with each cooling section (213).

8. A water-cooled burner according to any one of claims 1 to 7, characterized in that the fire holes (11) are elongated holes or round holes, the minor axis of the elongated holes or the diameter of the round holes being 0.8-1.2mm.

9. The water-cooled burner according to any one of claims 1 to 7, characterized in that the fire hole part (1) and the profiling part (2) are of an integral structure, and the two profiling parts (2) are folded and formed oppositely to the fire hole part (1) to form the injection passage (21).

10. The gas water heater is characterized by comprising a plurality of water-cooled burners according to any one of claims 1 to 9, wherein the plurality of water-cooled burners are closely assembled, and cooling water pipes (3) are arranged on the plurality of water-cooled burners in a penetrating manner.

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