CN218972913U

CN218972913U - Waterway connection structure and gas water heater

Info

Publication number: CN218972913U
Application number: CN202223579567.8U
Authority: CN
Inventors: 卢楚鹏; 卢梓杰
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-05
Anticipated expiration: 2032-12-30

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a waterway connection structure and a gas water heater. The waterway connection structure comprises a water inlet joint and a water inlet pipe; one end of the water inlet joint is used for connecting an external water pipeline, the other end of the water inlet joint is provided with an inserting pipe part, a first inserting pipe groove is arranged in the inserting pipe part, the water inlet joint is detachably connected to the bottom shell and is arranged on the outer side of the bottom shell, and the inserting pipe part penetrates through the bottom shell and stretches into the inner side of the bottom shell; the inlet tube sets up in the drain pan, and the one end of inlet tube is used for dismantling the connection water pump, and the other end cartridge is in first intubate inslot, inlet tube and grafting pipe portion welded connection or joint spare joint. According to the waterway connection structure disclosed by the utility model, one end of the water inlet pipe is directly connected with the water inlet joint, the structure of one mounting seat is omitted, hidden danger points of waterway water leakage are reduced, the structure is simple, the production cost is reduced, the structure is simplified, and the water pump is convenient to mount; the gas water heater has the waterway connection structure, thereby achieving the effects of reducing the product cost and improving the product quality.

Description

Waterway connection structure and gas water heater

Technical Field

The utility model relates to the technical field of heat supply, in particular to a waterway connection structure and a gas water heater.

Background

Along with the continuous promotion of living standard, people have higher and higher requirements on the use of the water heater, so that the zero cold water gas water heater with the water return function is gradually accepted by the market. The zero cold water gas water heater is a water heater with the instant heating function, compared with the common gas water heater, the speed of hot water outlet is greatly improved, the waiting time can be saved, and meanwhile, the water saving effect is achieved. The main difference between the zero cold water gas water heater and the common water heater is that a water pump is connected to the water inlet end of a waterway in series, and the water pump is connected with an external water inlet joint through a water inlet pipe. In general, in order to guarantee the sealing performance of inlet tube and water inlet joint in junction, current zero cold water gas heater can be at the tip welding mount pad of inlet tube, and the mount pad is the pedestal that has certain thickness, is convenient for set up the seal groove of installation O type circle on the one hand to realize the radial seal of junction through compressing O type circle, on the other hand, realize through the mount pad with outside water inlet joint and water inlet piping connection's fixed position.

However, this mount structure has the following drawbacks: 1. the mounting seat processed by injection molding has insufficient sealing performance, and if a copper casting is adopted, the cost is greatly increased; 2. because the mounting seat needs to be provided with the connecting lugs which are matched and connected with the water inlet connector, the stress on the sealing surface of the mounting seat is uneven, so that the sealing surface is easy to deform in the welding process, the sealing performance is insufficient, the sealing performance becomes a hidden danger point of water leakage, and the performance of the zero cold water gas water heater is influenced; 3. the mounting seat has certain thickness, and occupation space is more for the mounting structure and the mounted position of water pump are restricted greatly.

Disclosure of Invention

One of the technical problems to be solved by the utility model is to provide a waterway connection structure, wherein one end of a water inlet pipe of the waterway connection structure is directly connected with a water inlet joint, so that hidden danger points of waterway water leakage are reduced, the structure is simple, and the production cost is reduced; simplify the structure, be convenient for the water pump installation.

The second technical problem to be solved by the utility model is to provide a gas water heater which is provided with the waterway connection structure, and the hidden danger of water leakage of the waterway is reduced by the structure that one end of the water inlet pipe is directly connected with the water inlet joint, so that the product cost is reduced, and the product quality is improved.

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

the utility model provides a waterway connection structure for gas heater, gas heater includes the drain pan, be provided with the water pump in the drain pan, waterway connection structure includes:

the water inlet connector is detachably connected to the bottom shell and arranged on the outer side of the bottom shell, and the plug-in pipe part penetrates through the bottom shell and stretches into the inner side of the bottom shell;

the water inlet pipe is arranged in the bottom shell, one end of the water inlet pipe is used for being detachably connected with the water pump, the other end of the water inlet pipe is inserted into the first pipe inserting groove, and the water inlet pipe is connected with the pipe inserting portion in a welding mode or is clamped with the clamping piece.

Compared with the background technology, the waterway connection structure has the following beneficial effects: the plug pipe part of the water inlet joint can penetrate through the bottom shell and extend into the inner side of the bottom shell, the water inlet pipe is inserted into the first plug pipe groove and is connected with the plug pipe part by welding or is connected with the water inlet joint by sealing and clamping the clamping piece, so that the radial sealing requirements of the water inlet joint and the water inlet pipe are met, and the sealing performance is good; the mounting seat is not welded at the end part of the water inlet pipe connected with the water inlet joint, so that the processing cost is reduced, the mounting is convenient, and the hidden danger of water leakage at one place is reduced; moreover, the elimination of the mounting seat also means that the space volume occupied by the water inlet pipe is greatly reduced, so that the size of the bottom shell can be reduced, and the limitation on the type selection and the mounting position of the water pump is avoided.

In one embodiment, one end of the first socket groove is provided with a first mounting chamfer extending to an end face of the socket pipe portion.

In one embodiment, the waterway connection structure further comprises a first connection seat, wherein the first connection seat is welded on one end, far away from the water inlet joint, of the water inlet pipe, and the first connection seat is used for detachably connecting the water pump.

In one embodiment, the water inlet pipe is welded to the plug pipe portion, and a first fillet weld is disposed on an end face of the plug pipe portion, and surrounds the periphery of the water inlet pipe.

In one embodiment, the first connecting seat is provided with a second pipe inserting groove, the water inlet pipe is inserted into the second pipe inserting groove, one end of the second pipe inserting groove is provided with a second installation chamfer extending to the end face of the first connecting seat, and/or the end face of the first connecting seat is provided with a second fillet weld, and the second fillet weld surrounds the periphery of the water inlet pipe.

In one embodiment, the periphery of the first connecting seat is provided with a sealing groove, the waterway connecting structure further comprises a first sealing ring, the first sealing ring is sleeved in the sealing groove, and the first sealing ring is used for sealing a gap between the first connecting seat and the water pump.

In one embodiment, the water inlet pipe is connected with the plugging pipe part through a clamping piece, and the waterway connection structure further comprises a sterilizing lamp connected to the first connecting seat and arranged in the first connecting seat.

In one embodiment, a connecting flange is arranged at one end of the plug-in pipe part, a connecting plate is sleeved on the water inlet pipe, the waterway connecting structure further comprises a clamp spring, and the clamp spring is clamped with the connecting flange and the connecting plate.

In one embodiment, one end of the water inlet pipe is provided with at least two limiting parts, at least two limiting parts are arranged along the axial direction of the water inlet pipe at intervals, the waterway connecting structure further comprises a second sealing ring, the second sealing ring is sleeved between two adjacent limiting parts, the second sealing ring is used for sealing a gap between the water inlet pipe and the water inlet joint, and the connecting plate is abutted to one of the limiting parts.

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

the utility model provides a gas water heater, including foretell water route connection structure, gas water heater still includes drain pan and water pump, water route connection structure's water inlet connector can dismantle connect in the drain pan, and set up in outside the drain pan, the inlet tube set up in the drain pan, and one end connect in the water pump.

Compared with the background technology, the gas water heater has the following beneficial effects: the water inlet pipe is connected with the water inlet joint through welding, and also can be connected with the water inlet joint through the clamping piece in a clamping way, so that the radial sealing of the water inlet joint and the water inlet pipe is realized, and the water pump is convenient to install; the waterway connection structure eliminates a mounting seat, reduces the product cost of the gas water heater and improves the product quality.

Drawings

Fig. 1 is a front view of a waterway connection structure according to a first embodiment of the present utility model;

fig. 2 is a structural cross-sectional view of a waterway connection structure according to a first embodiment of the present utility model;

fig. 3 is a schematic diagram illustrating a disassembled waterway connection structure according to a second embodiment of the present utility model;

FIG. 4 is a schematic diagram of a gas water heater according to a third embodiment of the present utility model;

FIG. 5 is a schematic diagram II of a gas water heater according to a third embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a side plate of a bottom shell according to a third embodiment of the present utility model.

Description of the reference numerals:

1. a water inlet joint; 11. an insertion tube part; 111. a first cannula slot; 112. a first mounting chamfer; 113. a connecting flange; 12. a first fillet weld; 13. a mounting plate; 14. a pressure release valve; 15. a pipe joint; 2. a water inlet pipe; 21. a connecting plate; 22. a limiting piece; 3. a first connection base; 31. a second cannula slot; 32. a second mounting chamfer; 33. a second fillet weld; 34. sealing grooves; 4. a germicidal lamp; 5. a second seal ring;

100. a gas water heater; 101. a bottom case; 1011. a bottom shell side plate; 1001. a mounting hole; 102. and (3) a water pump.

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 "upper," "lower," "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" and "second" 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 "a first" and "a second" 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.

Example 1

An embodiment of the present utility model provides a waterway connection structure for a gas water heater 100, as shown in fig. 1 and 2. The gas water heater 100 comprises a bottom shell 101, and a water pump 102 is arranged in the bottom shell 101. The waterway connection structure comprises a water inlet joint 1 and a water inlet pipe 2. One end of the water inlet connector 1 is used for being connected with an external water pipeline, the other end of the water inlet connector is provided with an inserting pipe portion 11, a first inserting pipe groove 111 is formed in the inserting pipe portion 11, the water inlet connector 1 is detachably connected to the bottom shell 101 and is arranged on the outer side of the bottom shell 101, and the inserting pipe portion 11 penetrates through the bottom shell 101 and stretches into the inner side of the bottom shell 101. The water inlet joint 1 is provided with a mounting plate 13, a pressure relief valve 14 and a pipe joint 15, wherein when the plug pipe part 11 penetrates through the bottom shell 101 and stretches into the inner side of the bottom shell 101, the mounting plate 13 can be connected with the bottom shell 101; the relief valve 14 is used for the water route pressure release, and coupling 15 is used for threaded connection outside water pipe.

The water inlet pipe 2 is arranged in the bottom shell 101, one end of the water inlet pipe 2 is used for being detachably connected with the water pump 102, the other end of the water inlet pipe 2 is inserted into the first pipe inserting groove 111, and the water inlet pipe 2 is connected with the pipe inserting portion 11 in a welding mode. During installation, the water inlet pipe 2 and the water inlet joint 1 are welded and connected, then the water inlet pipe 2 and the plug pipe part 11 penetrate through the installation hole 1001 on the bottom shell 101 from the outer side of the bottom shell 101 to extend into the inner side of the bottom shell 101 (refer to fig. 6 in the third embodiment), the water inlet joint 1 is installed on the bottom shell 101 through a screw, and finally one end of the water inlet pipe 2 far away from the water inlet joint 1 is plugged into the water inlet of the water pump 102. After the installation, the support and the fixation of the water inlet pipe 2 can be further increased through a connecting clamp spring arranged at the water inlet of the water pump 102.

Alternatively, in the first embodiment, the water inlet pipe 2 may be a curved pipe. Because the plane of the water inlet of the water pump 102 and the axial section of the external water pipeline are vertical, compared with the connection structure adopting the L-shaped pipe, the curved pipe can reduce the space volume occupied by the water inlet pipe 2, further reduce the thickness of the bottom shell 101, and can not limit the model selection and the installation position of the water pump 102. The specific shape of the curved pipe can be bent according to the installation position of the water pump 102 in the bottom shell 101, and is not limited by the drawing of the embodiment.

According to the waterway connection structure provided by the embodiment of the utility model, the plugging tube part 11 of the water inlet connector 1 can penetrate through the bottom shell 101 and extend into the inner side of the bottom shell 101, the water inlet tube 2 is plugged into the first plugging tube groove 111, and the plugging tube part 11 is connected by welding, so that the radial sealing of the water inlet connector 1 and the water inlet tube 2 is realized, and the radial sealing performance is good; the integral installation structure of the water inlet joint 1 and the water inlet pipe 2 eliminates an installation seat, reduces the processing cost, is convenient to install, and reduces hidden danger of water leakage at one place; moreover, the elimination of the mounting seat also means that the space volume occupied by the water inlet pipe 2 is greatly reduced, so that the size of the bottom shell 101 can be reduced, and the selection and the mounting position of the water pump 102 are not limited.

Preferably, one end of the first socket groove 111 is provided with a first mounting chamfer 112, and the first mounting chamfer 112 extends to the end face of the socket pipe portion 11. The diameter of the first pipe insertion groove 111 is generally only 0.15mm larger than the outer diameter of the water inlet pipe 2, and by providing the first installation chamfer 112, on the one hand, the inner diameter of the first pipe insertion groove 111 is expanded, so that the water inlet pipe 2 is easier to insert; on the other hand, the welding water flows into the gap between the insertion pipe part 11 and the water inlet pipe 2 when welding is convenient, and the welding strength is increased.

Further, when the water inlet pipe 2 and the plug pipe portion 11 are welded together, the end face of the plug pipe portion 11 is provided with a first fillet 12, and the first fillet 12 surrounds the outer periphery of the water inlet pipe 2. The depth of the first inserting tube groove 111 may be half of that of the inserting tube portion 11, so as to meet the requirement of the connection strength.

As a preferred scheme, when inlet tube 2 and grafting pipe portion 11 welded connection, waterway connection structure still includes first connecting seat 3, and first connecting seat 3 welded connection is kept away from the one end of water joint 1 on inlet tube 2, and first connecting seat 3 is used for dismantling connection water pump 102. Specifically, the first connecting seat 3 is provided with a second pipe inserting groove 31, the water inlet pipe 2 is inserted in the second pipe inserting groove 31, one end of the second pipe inserting groove 31 is provided with a second mounting chamfer 32 extending to the end face of the first connecting seat 3, the end face of the first connecting seat 3 is provided with a second fillet weld 33, and the second fillet weld 33 surrounds the periphery of the water inlet pipe 2. Also, the second mounting chamfer 32 expands the inner diameter of the second insertion tube groove 31 on the one hand, making it easier to insert the water inlet tube 2; on the other hand, the welding water flows into the gap between the first connecting seat 3 and the water inlet pipe 2 when being conveniently welded, so that the welding strength is increased.

As a preferable scheme, the periphery of the first connecting seat 3 is provided with a sealing groove 34, the waterway connecting structure further comprises a first sealing ring (not shown in the figure), the first sealing ring is sleeved in the sealing groove 34, and the first sealing ring is used for sealing a gap between the first connecting seat 3 and the water pump 102; the sealing performance between the connecting seat 3 and the water pump 102 is improved by the first sealing ring, and the connecting and sealing can be realized by inserting the first connecting seat 3 into the water inlet of the water pump 102.

Example two

In a first embodiment of the present utility model, as shown in fig. 3, a waterway connection structure is provided, and the waterway connection structure includes a water inlet connector 1, a water inlet pipe 2, and a first connection seat 3, which are the same as those in the first embodiment. One end of the water inlet connector 1 is used for being connected with an external water pipeline, the other end of the water inlet connector is provided with an inserting pipe portion 11, a first inserting pipe groove 111 is formed in the inserting pipe portion 11, the water inlet connector 1 is detachably connected to the bottom shell 101 and is arranged on the outer side of the bottom shell 101, and the inserting pipe portion 11 penetrates through the bottom shell 101 and stretches into the inner side of the bottom shell 101. The water inlet pipe 2 is arranged in the bottom shell 101, one end of the water inlet pipe 2 is detachably connected with the water pump 102, and the other end of the water inlet pipe 2 is inserted into the first pipe inserting groove 111; the first connecting seat 3 is welded and connected to one end, far away from the water inlet joint 1, of the water inlet pipe 2, and the first connecting seat 3 is used for detachably connecting the water pump 102.

The second embodiment is different in that the water inlet pipe 2 and the plug pipe portion 11 are clamped by a clamping member. Specifically, in the second embodiment, the waterway connection structure further includes a germicidal lamp 4, and the germicidal lamp 4 is connected to the first connection seat 3 and disposed in the first connection seat 3. The sterilizing lamp 4 can adopt a UV sterilizing lamp for sterilizing and disinfecting the water entering the water pump 102; because the germicidal lamp 4 is present, the first connecting seat 3 is large in volume and cannot be connected with the water inlet pipe 2 as an integral structure to pass through the mounting hole 1001 on the bottom shell 101 (refer to fig. 6 in the third embodiment), so that the water inlet pipe 2 and the water inlet joint 1 can be used as a split structure, the water inlet pipe 2 is mounted in the bottom shell 101, and the water inlet pipe 2 and the water inlet joint 1 are clamped by a clamping piece, and radial sealing of the water inlet joint 1 and the water inlet pipe 2 is also realized; the structure of the clamping piece is also identical to that of the embodiment, the mounting seat is omitted, and the same effect of reducing hidden danger of water leakage at one place is achieved.

As a preferred scheme, one end of the plugging tube portion 11 is provided with a connecting flange 113, the water inlet tube 2 is sleeved with a connecting plate 21, and the waterway connecting structure further comprises a clamp spring (not shown in the figure), and the clamp spring is clamped with the connecting flange 113 and the connecting plate 21. The structure and the clamping principle of the clamping spring are the prior art in the field, and the embodiment is not described herein in detail; in other embodiments, a clamping member such as a clip may be used, which is not limited to the present embodiment.

As the preferred scheme, the one end of inlet tube 2 is provided with two at least locating parts 22, and two at least locating parts 22 set up along the axial interval of inlet tube 2, and waterway connection structure still includes second sealing washer 5, and second sealing washer 5 suit is between two adjacent locating parts 22, and second sealing washer 5 is used for sealed inlet tube 2 and the clearance between the water inlet joint 1, and connecting plate 21 butt one of them locating part 22. The second sealing ring 5 can increase the tightness between the plug pipe portion 11 and the water inlet pipe 2.

Specifically, the water inlet pipe 2 can be made of copper pipe, has good extensibility, can be subjected to pipe upsetting by the pipe upsetting machine, and forms an annular limiting piece 22 protruding out of the pipe wall, and the processing mode is simple. In this embodiment, three limiting members 22 are provided, two grooves are provided between the three limiting members 22, and two second sealing rings 5 can be installed. And the limiting piece 22 furthest from the end part of the water inlet pipe 2 can be abutted against the connecting plate 21 for limiting the position of the connecting plate 21, so that the position movement of the connecting plate 21 is avoided, and the connection reliability of the water inlet pipe 2 and the water inlet joint 1 is further affected.

The waterway connection structure provided by the second embodiment realizes the connection and radial sealing of the water inlet joint 1 and the water inlet pipe 2 through the clamping piece, and also achieves the advantages of canceling the installation mode of one installation seat, reducing the processing cost and reducing the hidden danger of water leakage at one place; moreover, the elimination of the mounting base can reduce the size of the bottom case 101, facilitating the mounting of the water pump 102.

Example III

The third embodiment of the present utility model provides a gas water heater 100, as shown in fig. 4 to 6, the gas water heater includes a waterway connection structure in the first embodiment or the second embodiment, the gas water heater further includes a bottom shell 101 and a water pump 102, a water inlet joint 1 of the waterway connection structure is detachably connected to the bottom shell 101 and is disposed outside the bottom shell 101, a water inlet pipe 2 is disposed in the bottom shell 101, and one end of the water inlet pipe is connected to the water pump 102. Specifically, the bottom case 101 includes a bottom case side plate 1011, wherein the bottom case side plate 1011 is provided with a mounting hole 1001, the mounting hole 1001 being for passing through the insertion pipe portion 11, and the water intake pipe 2.

In the gas water heater 100 of the third embodiment, the plugging pipe portion 11 of the water inlet joint 1 can penetrate through the bottom shell 101 and extend into the inner side of the bottom shell 101, the water inlet pipe 2 is plugged into the first plugging pipe groove 111, the water inlet pipe 2 can be connected with the water inlet joint 1 through welding, and also can be connected with the water inlet joint 1 through a clamping piece in a clamping way, so that radial sealing of the water inlet joint 1 and the water inlet pipe 2 is realized, and the water pump 102 is convenient to install; the waterway connection structure eliminates a mounting seat, reduces the product cost of the gas water heater 100 and improves the product quality.

Specifically, when additional equipment such as the germicidal lamp 4 is not required to be installed on the water inlet pipe 2, the water inlet pipe 2 and the plug pipe portion 11 can be welded and connected, and when the water inlet pipe 2 and the plug pipe portion 11 which are welded are installed, the water inlet pipe 2 and the plug pipe portion 11 extend into the inner side of the bottom shell 101 from the outer side of the bottom shell 101 through the installation hole 1001 on the bottom shell 101, and then the water pump 102 is connected, as shown in fig. 4; when additional equipment such as a bactericidal lamp 4 is required to be installed on the water inlet pipe 2, the water inlet pipe 2 and the plug-in pipe part 11 can be connected through a clamping piece, the water inlet pipe 2 connected with the first connecting seat 3 is inserted into the plug-in pipe part 11 from the inner side of the bottom shell 101 during installation, and the water inlet connector 1 and the water inlet pipe 2 are clamped through clamping pieces such as a clamp spring, as shown in fig. 5.

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

1. The utility model provides a waterway connection structure for gas heater (100), gas heater (100) are including drain pan (101), be provided with water pump (102) in drain pan (101), its characterized in that, waterway connection structure includes:

the water inlet connector (1), one end of the water inlet connector (1) is used for being connected with an external water pipeline, the other end of the water inlet connector is provided with an inserting pipe portion (11), a first inserting pipe groove (111) is formed in the inserting pipe portion (11), the water inlet connector (1) is detachably connected to the bottom shell (101) and is arranged on the outer side of the bottom shell (101), and the inserting pipe portion (11) penetrates through the bottom shell (101) to extend into the inner side of the bottom shell (101);

the water inlet pipe (2) is arranged in the bottom shell (101), one end of the water inlet pipe (2) is used for being detachably connected with the water pump (102), the other end of the water inlet pipe is inserted into the first pipe inserting groove (111), and the water inlet pipe (2) is connected with the pipe inserting part (11) in a welding mode or is clamped with the pipe inserting part in a sealing mode.

2. Waterway connection structure according to claim 1, characterized in that one end of the first spigot groove (111) is provided with a first mounting chamfer (112), the first mounting chamfer (112) extending to an end face of the spigot pipe portion (11).

3. Waterway connection structure according to claim 1 or 2, characterized in that it further comprises a first connection seat (3), said first connection seat (3) being welded to said inlet pipe (2) at an end remote from said inlet joint (1), said first connection seat (3) being adapted to be removably connected to said water pump (102).

4. A waterway connection structure according to claim 3, characterized in that the water inlet pipe (2) and the plug pipe portion (11) are welded, a first fillet weld (12) is provided on an end face of the plug pipe portion (11), and the first fillet weld (12) surrounds an outer periphery of the water inlet pipe (2).

5. Waterway connection structure according to claim 4, characterized in that the first connection socket (3) is provided with a second spigot groove (31), the water inlet pipe (2) is inserted in the second spigot groove (31), one end of the second spigot groove (31) is provided with a second mounting chamfer (32) extending to the end face of the first connection socket (3), and/or the end face of the first connection socket (3) is provided with a second fillet weld (33), the second fillet weld (33) encircling the periphery of the water inlet pipe (2).

6. The waterway connection structure of claim 4, characterized in that the first connection seat (3) is provided with a sealing groove (34) at the periphery, the waterway connection structure further comprises a first sealing ring sleeved in the sealing groove (34), and the first sealing ring is used for sealing a gap between the first connection seat (3) and the water pump (102).

7. A waterway connection structure according to claim 3, characterized in that the water inlet pipe (2) and the plug-in pipe portion (11) are clamped, the waterway connection structure further comprises a germicidal lamp (4), the germicidal lamp (4) is connected to the first connection seat (3) and is arranged in the first connection seat (3).

8. The waterway connection structure according to claim 7, characterized in that one end of the plugging tube portion (11) is provided with a connection flange (113), the water inlet tube (2) is sleeved with a connection plate (21), the waterway connection structure further comprises a clamp spring, and the clamp spring is clamped with the connection flange (113) and the connection plate (21).

9. Waterway connection structure according to claim 8, characterized in that one end of the water inlet pipe (2) is provided with at least two limiting members (22), at least two limiting members (22) are arranged along the axial direction of the water inlet pipe (2) at intervals, the waterway connection structure further comprises a second sealing ring (5), the second sealing ring (5) is sleeved between two adjacent limiting members (22), the second sealing ring (5) is used for sealing a gap between the water inlet pipe (2) and the water inlet joint (1), and the connecting plate (21) is abutted against one of the limiting members (22).

10. The gas water heater is characterized by comprising the waterway connection structure as claimed in any one of claims 1-9, further comprising a bottom shell (101) and a water pump (102), wherein a water inlet joint (1) of the waterway connection structure is detachably connected to the bottom shell (101) and is arranged outside the bottom shell (101), and a water inlet pipe (2) is arranged in the bottom shell (101) and one end of the water inlet pipe is connected to the water pump (102).