CN218993687U - Condensing gas water heater - Google Patents

Abstract

The utility model relates to a condensing gas water heater, which comprises a combustion chamber, a condenser, a smoke exhaust pipe joint, an atomization assembly and an exhaust assembly; the water inlet end of the atomization assembly is communicated with the water outlet of the condenser and is used for atomizing condensed water; the exhaust assembly is arranged between the condenser and the smoke exhaust pipe joint and comprises a body, a contraction channel and a diffusion channel which are mutually communicated are arranged in the body, the air inlet end of the contraction channel is communicated with the smoke outlet of the condenser, the air outlet end of the diffusion channel is communicated with the smoke exhaust pipe joint, and the diffusion channel is communicated with the air outlet end of the atomization assembly. The exhaust assembly can discharge the condensed water after flue gas and atomization from the smoke extraction pipe rapidly, an external drain pipe is not required to discharge the condensed water, and the exhaust assembly is arranged in the water heater shell, so that the integration of the water heater is improved, and the water heater is installed conveniently.

Description

Condensing gas water heater

Technical Field

The utility model relates to the technical field of hot water equipment, in particular to a condensing gas water heater.

Background

With the continuous improvement of the living standard of people, the water heater becomes an indispensable important household appliance in daily life.

As shown in fig. 1, the condensation type gas water heater currently comprises a combustion chamber 1', a main heat exchanger 2', a condenser 3', a smoke discharging device 8' and a flue 4', wherein the burner 5' is arranged below the combustion chamber 1', the main heat exchanger 2' is positioned above the combustion chamber 1', the smoke discharging device 8' is arranged above the main heat exchanger 2', a smoke outlet of the smoke discharging device 8' is communicated with a smoke inlet of the condenser 3', and a smoke outlet of the condenser 3' is communicated with the flue 4 '.

The heat exchange area of the condensing gas water heater is mainly formed by two areas of a main heat exchanger 2 'and a condenser 3', gas and air are fully mixed and then enter a combustor 5 'for combustion, and high-temperature flue gas generated by combustion sequentially passes through the main heat exchanger 2' and the condenser 3 'for heat exchange under the action of a smoke exhausting device 8', so that the heat efficiency of the condensing gas water heater is improved. The condensed water is formed after heat exchange of the condenser 3', and the condensed water of the existing condensed gas water heater is discharged in a mode that a condensed water outlet pipe 6' is externally connected to a water outlet of the condenser 3 'to guide the condensed water to a household water outlet pipe or a sewer pipe 7', but the condensed water is discharged in a mode that a water outlet is required to be arranged nearby a place where the condensed gas water heater is arranged, so that the condensed water of the condensed gas water heater can be conveniently discharged, the installation position of the water heater is limited, and the condensed gas water heater is easy to be inconvenient to install.

Disclosure of Invention

The utility model aims to provide a condensing gas water heater, which can improve the installation convenience of the condensing gas water heater.

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

the condensing gas water heater comprises a combustion chamber, a condenser, a smoke exhaust pipe joint, an atomization assembly and an exhaust assembly;

the water inlet end of the atomization assembly is communicated with the water outlet of the condenser and is used for atomizing condensed water;

the exhaust assembly is arranged between the condenser and the smoke exhaust pipe joint and comprises a body, a contraction channel and a diffusion channel which are mutually communicated are arranged in the body, the air inlet end of the contraction channel is communicated with the smoke outlet of the condenser, the air outlet end of the diffusion channel is communicated with the smoke exhaust pipe joint, and the diffusion channel is communicated with the air outlet end of the atomization assembly.

Compared with the background technology, the condensing gas water heater has the following beneficial effects: the atomizing subassembly atomizes the comdenstion water that produces in the condenser heat transfer process, when condensing gas heater during operation, high temperature flue gas flows through exhaust assembly from the condenser, high temperature flue gas forms high-speed air current in the shrink passageway, the place pressure that the flue gas velocity of flow is big diminishes, form venturi effect, the comdenstion water after atomizing flows into the diffusion passageway under the differential pressure effect, finally discharge from the exhaust pipe together with the flue gas, thereby when installing the water heater, need not external drain pipe in order to discharge the comdenstion water that the condenser heat transfer in-process produced, the adaptability of condensing gas heater to installation environment has been improved, so that the condensing gas heater is installed. And because the exhaust assembly is arranged between the condenser and the smoke exhaust pipe joint, the exhaust assembly is arranged in the shell of the condensing gas water heater, so that an external pipeline is not required to be externally connected to communicate the negative pressure channel with the atomization assembly, the integration and the aesthetic property of the condensing gas water heater are enhanced, and the subsequent installation is convenient.

In one embodiment, the body includes a constriction portion and a diffuser portion, the constriction portion is internally provided with the constriction channel, the diffuser portion is internally provided with the diffuser channel, an air outlet end of the constriction portion is inserted into an air inlet end of the diffuser portion, a space exists between an outer wall of the constriction portion and an inner wall of the diffuser portion and a negative pressure channel is formed, and the negative pressure channel is communicated with an air outlet end of the atomizing assembly.

In one embodiment, the constriction part and the diffusion part are both annularly arranged, the included angle between the side wall of the air outlet end of the constriction part and the central axis of the air outlet end is alpha, and the included angle is 20-30 degrees;

and the included angle between the side wall of the diffuser and the central axis of the diffuser is beta, and beta=0.8α -1.0α.

In one embodiment, the body further comprises a connecting part, one end of the connecting part is connected with the diffuser, the other end of the connecting part is connected with the peripheral wall of the constriction part, and a plurality of air vents are arranged on the connecting part at intervals along the circumferential direction;

the negative pressure channel is communicated with the air outlet end of the atomization assembly through the air vent.

In one embodiment, the exhaust assembly further comprises a housing, the housing is circumferentially arranged on the periphery of the body, the housing and the body are arranged at intervals, a gas collecting channel communicated with the air vent is formed between the housing and the body, and the gas collecting channel is communicated with the air outlet end of the atomization assembly.

In one embodiment, the side walls of the housing are provided protruding outwards at the corresponding connection.

In one embodiment, the body has opposite first and second ends, the housing has opposite third and fourth ends, the first end is sealingly connected to the third end, and the second end is sealingly connected to the fourth end to form the closed gas collecting channel.

In one embodiment, the shell interlayer of the combustion chamber is provided with and forms a closed cooling channel, the cooling channel is communicated with the air outlet end of the atomization assembly, and the negative pressure channel is communicated with the cooling channel.

In one embodiment, a neutralization assembly is further arranged between the water outlet of the condenser and the water inlet end of the atomization assembly, and the neutralization assembly is used for neutralizing condensed water flowing out of the condenser.

Drawings

FIG. 1 is a schematic diagram of a prior art condensing gas water heater;

FIG. 2 is a schematic diagram of a condensing gas water heater according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of the body of an exhaust apparatus according to an embodiment of the present utility model;

FIG. 4 is an exploded view of an assembly of an exhaust assembly according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view of an exhaust assembly according to an embodiment of the present utility model;

FIG. 6 is a perspective view of an exhaust assembly according to an embodiment of the present utility model;

FIG. 7 is a top view of a combustion chamber according to an embodiment of the present utility model.

In fig. 1:

1', a combustion chamber; 2', a main heat exchanger; 3', a condenser; 4', a flue; 5', a burner; 6', condensing a water outlet pipe; 7', a sewer line; 8', fume extractor.

Fig. 2 to 7:

1. a combustion chamber; 11. a cooling channel; 12. an inlet; 13. an outlet; 2. a main heat exchanger; 3. a condenser; 31. condensing a water outlet pipe; 4. a smoke exhaust pipe; 5. a smoke exhausting device; 6. an atomizing assembly; 7. an exhaust assembly; 71. a body; 711. a constriction channel; 712. a diffusion passage; 713. a negative pressure channel; 714. a constriction; 7141. a first tapered section; 7142. a buffer section; 7143. a second tapered section; 715. a diffuser; 716. a connection part; 717. a vent; 718. a second boss; 72. a housing; 721. a first boss; 722. a third boss; 723. a fourth boss; 73. a gas collecting channel; 8. an air suction pipe; 9. a smoke exhaust pipe joint; 10. and a neutralization component.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "top," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," "third," "fourth," and "fifth" 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 defining "first", "second", "third", "fourth", "fifth" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Referring to fig. 2 and 3, an embodiment of the present utility model provides a condensing gas water heater, which includes a combustion chamber 1, a main heat exchanger 2, a condenser 3, a smoke exhaust pipe 4, a smoke exhaust pipe joint 9, a smoke exhaust device 5, an atomization assembly 6 and an exhaust assembly 7; the main heat exchanger 2 is arranged above the combustion chamber 1, the smoke exhaust device 5 is arranged above the main heat exchanger 2, and the smoke exhaust device 5 is used for forcedly exhausting the smoke of the combustion chamber 1 to the condenser 3. The condenser 3 is arranged at one side of the main heat exchanger 2, and the smoke inlet of the condenser 3 is communicated with the smoke outlet of the smoke discharging device 5. The exhaust assembly 7 is arranged between the condenser 3 and the smoke exhaust pipe joint 9, the air inlet end of the exhaust assembly 7 is communicated with the smoke outlet of the condenser 3, the air outlet end of the exhaust assembly 7 is connected with the smoke exhaust pipe joint 9 and communicated with the smoke exhaust pipe 4, and the exhaust assembly 7 is used for discharging smoke and atomized condensed water to the smoke exhaust pipe 4 together. The water inlet end of the atomization assembly 6 is communicated with the water outlet of the condenser 3 through a condensation water outlet pipe 31, and the atomization assembly 6 is used for atomizing condensed water.

Optionally, the condensing gas water heater further comprises a complete machine housing (not shown in the figure), and the exhaust assembly 7 is arranged in the complete machine housing. By arranging the exhaust assembly 7 within the complete machine housing, the exhaust assembly 7 may be hidden and protected.

Referring to fig. 3 and 4, the exhaust assembly 7 includes a body 71, a contraction channel 711 and a diffusion channel 712 which are mutually communicated are disposed in the body 71, the flow passage area of the air inlet end of the contraction channel 711 is larger than the flow passage area of the air outlet end, the flow passage area of the air inlet end of the diffusion channel 712 is smaller than the flow passage area of the air outlet end, the air outlet end of the contraction channel 711 is communicated with the air inlet end of the diffusion channel 712, the air inlet end of the contraction channel 711 is communicated with the exhaust port of the condenser 3, the air outlet end of the diffusion channel 712 is communicated with the exhaust pipe joint 9, and the diffusion channel 712 is communicated with the air outlet end of the atomization assembly 6.

During the condensing gas water heater in this application during operation, high temperature flue gas flows through exhaust assembly 7 from condenser 3, when high temperature flue gas flows through shrink passageway 711 and diffusion passageway 712, high temperature flue gas forms high-speed air current in shrink passageway 711, the place pressure that the flue gas velocity of flow is big diminishes, then flow into in the diffusion passageway 712 again, form venturi effect, the comdenstion water that is atomized by atomizing assembly 6 flows into in diffusion passageway 712 under the differential pressure effect, finally discharge from exhaust pipe 4 together with the flue gas, thereby need not external drain pipe in order to discharge the comdenstion water that condenser 3 heat transfer in-process produced when the installation, the adaptability of condensing gas water heater to installation environment has been improved, so that condensing gas water heater is installed. And because the exhaust assembly 7 is arranged between the condenser 3 and the smoke exhaust pipe joint 9, the exhaust assembly 7 is arranged in the shell of the condensing gas water heater, so that an external pipeline is not required to be externally connected to communicate the diffusion channel 712 with the atomization assembly 6, the integration and the aesthetic property of the condensing gas water heater are enhanced, and the subsequent installation is convenient.

Specifically, as shown in fig. 3 to 4, the body 71 includes a constriction 714 and a diffuser 715, a constriction channel 711 is formed in the constriction 714, a diffuser 712 is formed in the diffuser 715, an air outlet end of the constriction 714 is inserted into an air inlet end of the diffuser 715, a space is formed between an outer wall of the constriction 714 and an inner wall of the diffuser 715, and a negative pressure channel 713 is formed, the negative pressure channel 713 surrounds the periphery of the constriction 714, and the diffuser 712 communicates with the air outlet end of the atomizing assembly 6 through the negative pressure channel 713. The pressure is smaller where the gas flow rate is larger, and thus the pressure is larger at the communication between the constriction 714 and the diffuser 715, which contributes to the negative pressure effect of the negative pressure passage 713.

In other embodiments, the constriction 714 may be connected to the diffuser 715 in a butt-joint manner, and a through hole communicating with the air outlet end of the atomizing assembly 6 is formed on the air inlet end side wall of the diffuser 715, so that negative pressure can be formed and atomized condensed water can be sucked into the diffuser 712.

For example, along the flue gas flow direction, the constriction 714 includes a first tapered section 7141, a buffer section 7142, and a second tapered section 7143 that are sequentially connected, the flow area of the first tapered section 7141 is greater than the flow area of the buffer section 7142, the flow area of the buffer section 7142 is greater than the flow area of the second tapered section 7143, and the second tapered section 7143 is in communication with the diffuser 715. The flue gas flows along the first tapered section 7141, the buffer section 7142 and the second tapered section 7143 in sequence, the flue gas can be accelerated for the first time in the process of flowing from the first tapered section 7141 to the buffer section 7142, and the flue gas can be accelerated for the second time in the process of flowing from the buffer section 7142 to the second tapered section 7143, so that the flue gas flows in the constriction 714 at a high speed.

Preferably, as shown in fig. 3, the constriction 714 and the diffuser 715 are annular, and the side wall of the second tapered section 7143 has an included angle α with the central axis of the body 71 of 20 ° to 30 °. Too small an angle alpha increases the flow resistance of the flue gas, which results in unsmooth exhaust of the flue gas, and too large an angle alpha reduces the venturi effect and the negative pressure effect, thereby reducing the adsorption effect of the exhaust assembly 7 and unsmooth exhaust of the gas in the cooling channel 11.

Further, an included angle β, β=0.8a-1.0a is formed between the side wall of the diffuser 715 and the central axis of the body 71, and the diffuser 715 is adapted to the constriction 714, so as to ensure smooth exhaust of the exhaust assembly 7.

Further, the body 71 further includes a connecting portion 716, one end of the connecting portion 716 is connected to the diffuser 715, the other end is connected to the outer peripheral wall of the constriction 714, and the connecting portion 716 is integrally formed with the constriction 714 and the diffuser 715. Specifically, the outer peripheral wall of the diffuser 715, the outer peripheral wall of the connecting portion 716, and the outer peripheral wall of the buffer section 7142 of the constriction 714 are flush. The connection portion 716 is provided with a plurality of vents 717 at intervals in the circumferential direction, and the negative pressure passage 713 communicates with the air outlet end of the atomizing assembly 6 through the vents 717.

As illustrated in fig. 3 to 6, the exhaust assembly 7 further includes a housing 72, the housing 72 is disposed around the periphery of the body 71, the housing 72 and the body 71 are disposed at intervals, and a gas collecting channel 73 communicating with a vent 717 is formed therebetween, and the gas collecting channel 73 communicates with the gas outlet end of the atomizing assembly 6 through a pipe. The gas collecting channel 73 can play a role of collecting gas, so that the gas can flow into the negative pressure channel 713 from each vent 717 at the same time, and the exhaust efficiency is improved; meanwhile, when gas enters the gas collection channel 73 with a larger flow area from a pipeline with a smaller flow area, a venturi effect can be formed, so that the negative pressure effect at the negative pressure channel 713 is enhanced, the gas can flow into the negative pressure channel 713 and be discharged more quickly, the situation that the negative pressure effect is poor due to overlong discharge paths is avoided, and the gas is prevented from flowing unsmoothly is avoided.

The side walls of the housing 72 are outwardly convex at the corresponding connection 716. The local protruding setting of shell 72 can increase the volume of gas collection passageway 73, further promotes the negative pressure effect of negative pressure passageway 713 department for the gas can flow into the negative pressure passageway 713 in the discharge more fast, avoids discharging the route overlength and leads to the negative pressure effect relatively poor, thereby prevents that the gas from flowing unsmooth condition.

The arrows without reference numerals in the figures indicate the discharge direction of the flue gas and the discharge direction of the condensed water.

Wherein, shell 72 and body 71 are annular structure, and body 71 inserts in shell 72.

Specifically, the body 71 has opposite first and second ends, the housing 72 has opposite third and fourth ends, the first end is in sealing connection with the third end, and the second end is in sealing connection with the fourth end to form a closed gas collecting channel 73, so as to ensure the gas collecting effect of the gas collecting channel 73.

As illustrated in fig. 3 to 6, the third end of the housing 72 is provided with a first boss 721 in the circumferential direction, the first end of the body 71 is provided with a second boss 718 in the circumferential direction, and the first boss 721 and the second boss 718 abut against each other, thereby achieving a sealed connection between the first end and the third end.

The first boss 721 and the second boss 718 are connecting flanges.

Further, referring to fig. 2, 4, 5 and 6, the exhaust assembly 7 is connected to the condenser 3 through the first boss 721 and the second boss 718. The first boss 721 is provided with a first fixing hole, the position of the second boss 718 corresponding to the first fixing hole is provided with a second fixing hole, the condenser 3 is provided with a first threaded hole corresponding to the second fixing hole, and a screw can pass through the first fixing hole and the second fixing hole to be connected with the first threaded hole, so that the body 71 is fixed in the housing 72, and meanwhile, the sealing connection between the exhaust assembly 7 and the condenser 3 is realized.

As shown in fig. 5, for example, the second end of the body 71 is inserted into the housing 72, a third boss 722 is circumferentially disposed on the inner wall of the fourth end of the housing 72, and the end face of the second end abuts against the third boss 722, so that the second end and the fourth end are connected in a sealing manner.

Further, referring to fig. 2, 4, 5 and 6, a fourth boss 723 is provided on the outer wall of the fourth end of the housing 72 in the circumferential direction, a fifth boss (not shown) is provided on the smoke exhaust pipe joint 9, and the fourth boss 723 and the fifth boss are abutted and connected by a screw, thereby realizing the sealing connection of the housing 72 and the smoke exhaust pipe joint 9.

The fourth boss 723 is provided with a second screw hole, and the smoke exhaust pipe joint 9 is provided with a third fixing hole through which a screw can be connected to the second screw hole, thereby fixing the exhaust assembly 7 and the smoke exhaust pipe joint 9.

Specifically, the third boss 722 and the fourth boss 723 are integrally designed to form a connection flange.

Optionally, the shell interlayer of the combustion chamber 1 is provided with and forms a sealed cooling channel 11, the air outlet end of the atomization component 6 is communicated with the cooling channel 11, the side wall of the shell 72 is provided with an air suction connector, the air suction connector is communicated with an air suction pipe 8, the air suction pipe 8 is communicated with the cooling channel 11, and the air collection channel 73 is communicated with the cooling channel 11 through the air suction pipe 8.

Because the condensing gas water heater has high combustion temperature, the surface temperature of the combustion chamber 1 is also high, and electronic elements near the outer side of the combustion chamber 1 are easily damaged, so that the condensing gas water heater has unstable performance and even cannot work.

When the condensing gas water heater works, negative pressure is generated due to the operation of the exhaust component 7, so that condensed water atomized by the atomization component 6 can flow through the cooling channel 11, and the atomized condensed water is utilized to absorb heat of the combustion chamber 1 so as to reduce the surface temperature of the combustion chamber 1, thereby avoiding overheat damage of electronic elements adjacent to the combustion chamber 1, being beneficial to improving the performance of the condensing gas water heater and prolonging the service life of the condensing gas water heater; meanwhile, the stability of the atomized water vapor is improved, so that the atomized water vapor is not easy to condense, and the water vapor is discharged more thoroughly.

As an example, as shown in fig. 7, the cooling passage 11 has an inlet 12 and an outlet 13, the inlet 12 and the outlet 13 of the cooling passage 11 are respectively provided at opposite sides of the housing of the combustion chamber 1, the cooling passage 11 includes a front end passage and a rear end passage, and atomized condensed water can flow from the inlet 12 of the cooling passage 11 along the front end passage and the rear end passage simultaneously to the outlet 13 of the cooling passage 11, respectively, and exchanges heat with the circumferential portion of the combustion chamber 1 to cool down, thereby improving the flow efficiency of the atomized water.

The path lengths of the front end channel and the rear end channel are the same, so that the negative pressure of the front end channel and the negative pressure of the rear end channel are consistent, and the gas discharge of the front end channel and the rear end channel is facilitated.

Preferably, the inlet 12 of the cooling channel 11 is adjacent to the lower side of the housing of the combustion chamber 1, the outlet 13 of the cooling channel 11 is adjacent to the upper side of the housing of the combustion chamber 1, and the gas can move along the periphery of the combustion chamber 1 and also can move from bottom to top along the combustion chamber 1 so as to exchange heat and cool each area of the combustion chamber 1 and prevent local high temperature on the surface of the combustion chamber 1.

Specifically, as shown in fig. 1, a neutralization assembly 10 is further disposed between the condenser 3 and the atomizing assembly 6, and the neutralization assembly 10 is capable of neutralizing condensed water flowing through the condensed water outlet pipe 31 to reduce acidity of the condensed water.

For example, the neutralizing assembly 10 may employ a magnesium rod.

It should be noted that, the atomization assembly 6 may be an atomizer in the prior art, and the specific structure of the atomization assembly 6 is not described herein.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (9)

1. The condensing gas water heater is characterized by comprising a combustion chamber (1), a condenser (3), a smoke exhaust pipe joint (9), an atomization assembly (6) and an exhaust assembly (7);

the water inlet end of the atomization assembly (6) is communicated with the water outlet of the condenser (3) and is used for atomizing condensed water;

the exhaust assembly (7) is arranged between the condenser (3) and the smoke exhaust pipe joint (9), the exhaust assembly (7) comprises a body (71), a contraction channel (711) and a diffusion channel (712) which are mutually communicated are arranged in the body (71), an air inlet end of the contraction channel (711) is communicated with a smoke outlet of the condenser (3), an air outlet end of the diffusion channel (711) is communicated with the smoke exhaust pipe joint (9), and the diffusion channel (712) is communicated with an air outlet end of the atomization assembly (6).

2. The condensing gas water heater according to claim 1, characterized in that the body (71) comprises a constriction (714) and a diffuser (715), the constriction (714) is internally provided with the constriction channel (711), the diffuser (715) is internally provided with the diffuser channel (712), the air outlet end of the constriction (714) is inserted into the air inlet end of the diffuser (715), a space exists between the outer wall of the constriction (714) and the inner wall of the diffuser (715) and a negative pressure channel (713) is formed, and the negative pressure channel (713) is communicated with the air outlet end of the atomizing assembly (6).

3. The condensing gas water heater according to claim 2, wherein the constriction (714) and the diffuser (715) are both annularly arranged, and an included angle between a side wall of the gas outlet end of the constriction (714) and a central axis thereof is between 20 and 30 degrees;

the included angle between the side wall of the diffuser (715) and the central axis of the diffuser is beta, and beta=0.8α -1.0α.

4. The condensing gas water heater according to claim 2, wherein the body (71) further comprises a connecting portion (716), one end of the connecting portion (716) is connected with the diffuser portion (715), the other end is connected with the outer peripheral wall of the constriction portion (714), and a plurality of ventilation ports (717) are arranged at intervals along the circumferential direction of the connecting portion (716);

the negative pressure channel (713) communicates with the outlet end of the atomizing assembly (6) through the vent (717).

5. The condensing gas water heater according to claim 4, wherein the exhaust assembly (7) further comprises a housing (72), the housing (72) is circumferentially arranged on the periphery of the body (71), the housing (72) and the body (71) are arranged at intervals, a gas collection channel (73) communicated with the vent (717) is formed between the housing and the body, and the gas collection channel (73) is communicated with the gas outlet end of the atomization assembly (6).

6. The condensing gas water heater of claim 5, wherein the side walls of the housing (72) are outwardly convex at locations corresponding to the connection portions (716).

7. The condensing gas water heater of claim 6 wherein said body (71) has opposed first and second ends, said housing (72) has opposed third and fourth ends, said first end being sealingly connected to said third end and said second end being sealingly connected to said fourth end to form said gas collection channel (73) in a closed condition.

8. The condensing gas water heater according to claim 2, characterized in that the housing sandwich of the combustion chamber (1) is provided and forms a closed cooling channel (11), the cooling channel (11) being in communication with the outlet end of the atomizing assembly (6), the negative pressure channel (713) being in communication with the cooling channel (11).

9. Condensing gas water heater according to any one of claims 1-7, characterized in that a neutralization assembly (10) is further arranged between the water outlet of the condenser (3) and the water inlet end of the atomizing assembly (6), the neutralization assembly (10) being used for neutralizing the condensed water flowing out of the condenser (3).

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