CN219177980U

CN219177980U - Exhaust pipe assembly and heat pump water heater comprising same

Info

Publication number: CN219177980U
Application number: CN202223609062.1U
Authority: CN
Inventors: 卢楚鹏; 付磊涛
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: 2023-06-13
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to an exhaust pipe assembly and a heat pump water heater comprising the same, wherein the exhaust pipe assembly comprises a three-way pipe fitting, an inner pipe fitting and an outer pipe fitting, the three-way pipe fitting is provided with a first interface, a second interface and a third interface, the outer pipe fitting is connected with the second interface, the outer pipe fitting is sleeved on the inner pipe fitting, and a first air inlet channel communicated with the outside is formed between the outer pipe fitting and the inner pipe fitting; one end of the inner pipe fitting extends into the three-way pipe fitting from the second connector and extends to the first connector, and an exhaust channel communicated with the outside is formed in the inner pipe fitting; the inner pipe fitting and the three-way pipe fitting are connected through a first interface, and the three-way pipe fitting is connected through a second air inlet channel. The utility model can improve the condition that the exhaust pipe assembly is easy to be limited by the installation site when being installed, and can discharge the indoor exhaust gas.

Description

Exhaust pipe assembly and heat pump water heater comprising same

Technical Field

The utility model relates to the technical field of water heaters, in particular to an exhaust pipe assembly and a heat pump water heater comprising the same.

Background

The water heater is a household appliance commonly used in daily life of people, and is often divided into an electric water heater, a gas water heater and a heat pump water heater, and the heat pump water heater is widely applied because of high energy efficiency. The heat pump water heater comprises a main machine shell, an evaporator and a fan assembly are arranged in the main machine shell, one side of the evaporator is matched with the fan assembly to form a heat exchange assembly with a negative pressure cavity after being electrified, an air inlet port and an air outlet port are formed in the heat exchange assembly, an air inlet and an air outlet which are separately designed are formed in the main machine shell, one end of the air inlet is communicated with the air inlet pipe to be directly communicated with the outside of the air chamber, and one end of the air outlet is communicated with the air outlet pipe to be directly communicated with the outside of the air chamber. In the using process of the heat pump water heater, outdoor air can enter the main machine shell through the air inlet pipe and is discharged outdoors through the air outlet pipe after entering the heat exchange assembly from the other side of the evaporator under the action of air pressure difference, so that the heat exchange effect of the air on the evaporator is achieved.

Therefore, the air inlet and outlet structure of the existing heat pump water heater adopts a structure that the air inlet and the air outlet are separated, two air pipes are required to be connected during installation, namely, the air inlet is connected with one air pipe (air inlet pipe), the air outlet is connected with one air pipe (air outlet pipe), the occupied space is large, the air inlet and outlet structure is easily limited by an installation site during installation, and meanwhile, air can be only fed from the outside due to the fact that air can be fed into the air inlet and outlet structure, and ventilation is difficult to be carried out indoors.

Disclosure of Invention

One of the technical problems to be solved by the utility model is to provide an exhaust pipe assembly which can effectively avoid the limitation of an installation site when an air inlet and outlet structure is installed; the air intake and exhaust structure can also exchange air between the indoor and outdoor and can exhaust the indoor exhaust air.

The second technical problem to be solved by the utility model is to provide a heat pump water heater, which can effectively improve the condition that the installation site is easy to limit during installation and can facilitate the discharge of indoor waste gas.

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

the utility model provides an exhaust pipe assembly, includes tee bend pipe fitting, inner tube spare and outer tube spare, tee bend pipe fitting has first interface, second interface and third interface, outer tube spare with the second interface is connected, outer tube spare cover is located inner tube spare, outer tube spare with be formed with the first air inlet channel that communicates outdoor between the inner tube spare; one end of the inner pipe fitting extends into the three-way pipe fitting from the second connector and extends to the first connector, and an exhaust channel communicated with the outside is formed in the inner pipe fitting; the inner pipe fitting and the three-way pipe fitting are connected through a first interface, and the three-way pipe fitting is connected through a second air inlet channel.

Compared with the background art, the exhaust pipe assembly has at least the following beneficial effects:

when the exhaust pipe assembly is used, the exhaust pipe assembly is arranged on the water heater, and outdoor air enters the water heater from the first air inlet channel for heat exchange and is discharged out of the room from the exhaust channel; the third port of the three-way pipe fitting is communicated with the indoor space, so that indoor air enters the water heater through the second air inlet channel to exchange heat and then is discharged out of the air outlet channel, and indoor waste gas can be discharged, and the ventilation effect is achieved. In addition, the exhaust pipe assembly is characterized in that the two air pipes are installed in a sleeved installation mode, namely the outer pipe fitting is sleeved on the inner pipe fitting, so that the occupied space is small, and the situation that the two air pipes are independently and separately installed and are easily limited by an installation site can be improved.

In one embodiment, the exhaust pipe assembly further comprises a tail pipe assembly, the tail pipe assembly comprises a tail outer pipe and a tail inner pipe, the tail outer pipe is sleeved on the tail inner pipe, the tail outer pipe is connected with one end of the outer pipe, which is away from the three-way pipe, the tail inner pipe is connected with one end of the inner pipe, which is away from the three-way pipe, an air channel is arranged between the inner wall of the tail outer pipe and the outer wall of the tail inner pipe, the first air inlet channel is communicated with the outdoor through the air channel, and the exhaust channel is communicated with the outdoor through the tail inner pipe.

In one embodiment, the length of the tail inner tube is greater than that of the tail outer tube, one end of the tail inner tube, which is close to the three-way pipe fitting, is flush with the end of the tail outer tube, and the other end of the tail inner tube protrudes out of the tail outer tube.

In one embodiment, a first mounting part is arranged on the tail outer tube, and the outer tube is in plug-in fit with the first mounting part; the tail inner pipe is provided with a second installation part, and the inner pipe fitting is in plug-in fit with the second installation part.

In one embodiment, the first mounting portion and the tail outer tube are integrally formed, the first mounting portion comprises a first transition section and a first annular connecting section, the first transition section is respectively connected with the tail outer tube and the first annular connecting section, the inner diameter of the first transition section is gradually increased from the tail outer tube to the direction of the first annular connecting section, the tail outer tube is inserted into the first annular connecting section, and the inner diameter of the first annular connecting section is identical to the outer diameter of the tail outer tube.

In one embodiment, the second mounting portion and the tail inner tube are integrally formed, the second mounting portion comprises a second transition section and a second annular connecting section, the second transition section is respectively connected with the tail inner tube and the second annular connecting section, the inner diameter of the second transition section is gradually increased from the tail inner tube to the direction of the second annular connecting section, the tail inner tube is inserted into the second annular connecting section, and the inner diameter of the second annular connecting section is identical to the outer diameter of the tail inner tube.

In one embodiment, the first interface and the third interface are coaxially arranged, the inner pipe comprises an elbow and a straight pipe, the elbow is located in the three-way pipe, a first end of the elbow extends to the first interface, a second end of the elbow extends to the second interface, the straight pipe is connected with a second end of the elbow, and the straight pipe is located in the outer pipe and coaxially arranged with the outer pipe.

In one embodiment, the third interface is detachably connected with a sleeve cover.

In one embodiment, a first filter screen is arranged in the tail outer pipe and the tail inner pipe, the first filter screen is annular, the outer side of the first filter screen is connected with the inner wall of the tail outer pipe, and the inner side of the first filter screen is connected with the outer wall of the tail inner pipe; and/or a second filter screen is arranged in the tail inner pipe.

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

the heat pump water heater comprises a host shell and the exhaust pipe assembly, wherein the host shell is provided with an air inlet and an air outlet, the air inlet is arranged on the periphery of the air outlet in a surrounding mode, the first interface is connected with the air inlet, and one end of the inner pipe fitting, extending into the three-way pipe fitting, is connected with the air outlet.

Compared with the background technology, the heat pump water heater has at least the following beneficial effects: by adopting the exhaust pipe assembly, the outer pipe fitting is sleeved on the inner pipe fitting, so that the situation that the installation site is easily limited during installation can be improved; the third interface of the three-way pipe fitting is communicated with the room, so that the exhaust gas in the room can be conveniently discharged.

Drawings

FIG. 1 is a schematic view of a heat pump water heater according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram showing an exploded structure of a heat pump water heater according to an embodiment of the present utility model;

FIG. 3 is a schematic illustration of an installation of a tailpipe assembly according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a heat pump water heater according to a second embodiment of the present utility model.

Reference numerals illustrate: 10. a host housing; 101. an air inlet; 20. a heat exchange assembly; 30. a three-way pipe fitting; 31. a sleeve cover; 40. an inner tube; 401. bending the pipe; 4011. an air outlet cover; 402. a straight pipe; 403. a straight-through pipe head; 41. an outer tube; 50. a first air inlet channel; 60. an exhaust passage; 70. a second air inlet channel; 80. a tail outer tube; 801. a first filter screen; 802. a first transition section; 8021. a first annular connecting section; 81. a tail inner tube; 811. a second filter screen; 812. a second transition section; 8121. a second annular connecting section.

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, if the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. indicate or refer to an orientation or a positional relationship based on that shown in the drawings, it is merely for convenience of description and to simplify the description, and does not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "first," "second," and the like, if used for descriptive purposes only, are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "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, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, communication, etc. should be construed broadly, and those skilled in the art may reasonably ascertain the specific meaning of the terms in the present utility model by combining the specific contents of the technical solutions.

Example 1

Referring to fig. 1-2, the present utility model discloses an exhaust pipe assembly, which includes a three-way pipe 30, an inner pipe 40 and an outer pipe 41, wherein the three-way pipe 30 has a first interface, a second interface and a third interface, the outer pipe 41 is connected with the second interface, the outer pipe 41 is sleeved on the inner pipe 40, and a first air inlet channel 50 communicated with the outside is formed between the outer pipe 41 and the inner pipe 40; one end of the inner pipe fitting 40 extends into the three-way pipe fitting 30 from the second interface and extends to the first interface, and an exhaust channel 60 communicated with the outside is formed in the inner pipe fitting 40; a second air inlet channel 70 is formed between the inner pipe fitting 40 and the three-way pipe fitting 30, the second air inlet channel 70 is communicated with the first air inlet channel 50, and the second air inlet channel 70 is communicated with the indoor space through a third interface.

In addition, the utility model also provides a heat pump water heater, which comprises a host shell 10 and the exhaust pipe component, wherein the heat exchange assembly 20 with a negative pressure cavity is formed by matching an evaporator and the fan component after power is on is arranged in the host shell 10, the host shell 10 is provided with an air inlet 101 and an air outlet, the air inlet 101 is arranged on the periphery of the air outlet in a surrounding mode, a first interface is connected with the air inlet 101, and one end of the inner pipe 40 extending into the three-way pipe 30 is connected with the air outlet.

It can be appreciated that when the exhaust pipe assembly is used, the exhaust pipe assembly is installed on the heat pump water heater, because the heat pump water heater is generally installed indoors, when the exhaust pipe assembly is used, outdoor air is generally used as heat exchange energy medium of the heat exchange assembly 20 and is subjected to the action of pressure difference, and the outdoor air enters the host shell 10 through the first air inlet channel 50 and is discharged from the exhaust channel 60 after passing through the heat exchange assembly 20 to achieve the heat exchange purpose; the third port of the three-way pipe fitting 30 is communicated with the room, so that the air in the room enters the water heater through the second air inlet channel 70 to exchange heat and then is discharged out of the room through the air outlet channel 60, and the indoor waste gas can be discharged, thereby achieving the ventilation effect. It should be noted that, the exhaust pipe assembly of the present utility model installs the two air pipes in a sleeved installation manner, that is, the outer pipe 41 is sleeved on the inner pipe 40, which occupies a small space, and can improve the situation that the two air pipes are independently and separately installed and are easily limited by the installation site.

In one embodiment, the third interface is removably connected with a cannula cover 31. When the second air inlet channel 70 is required to be communicated with the room, the sleeve cover 31 can be opened, and when the second air inlet channel 70 is required to be cut off from being communicated with the room, the sleeve cover 31 can be covered, so that the selection is more flexible. Optionally, an internal thread is provided on the inner wall of the sleeve cover 31, and an external thread adapted to the internal thread is provided on the outer wall of the third interface, so that the sleeve cover 31 is in threaded connection with the third interface, thereby facilitating the disassembly and assembly of the sleeve cover 31, and facilitating the use.

In one embodiment, the first interface of the three-way pipe fitting 30 is sleeved on the outer wall of the air inlet 101, so that the inner cavity of the three-way pipe fitting 30 is communicated with the inner cavity of the host housing 10, the air outlet port on the heat exchange assembly 20 is connected with the air outlet cover 4011, one end of the air outlet cover 4011, which is away from the heat exchange assembly 20, extends to the air inlet 101 to form an air outlet, and the air outlet cover 4011 is connected and communicated with one end of the inner pipe fitting 40, which extends to the first interface, so that the exhaust channel 60 is prevented from interfering with the first air inlet channel 50 and the second air inlet channel 70.

It is easy to understand that there is an air intake space between the outer wall of the air outlet housing 4011 and the inner wall of the air inlet 101, when outdoor air enters the main machine housing 10 from the first air intake passage 50 to exchange heat, it sequentially passes through the passage between the inner pipe fitting 40 and the outer pipe fitting 41, the inner cavity of the three-way pipe fitting 30, the air intake space, the inner cavity of the main machine housing 10, then enters the heat exchange assembly 20 to exchange heat, and then enters the inner pipe fitting 40 from the air outlet housing 4011 to be discharged.

In one embodiment, the first interface and the third interface are coaxially arranged, the inner tube 40 includes an elbow 401 and a straight tube 402, the elbow 401 is located in the three-way tube 30, a first end of the elbow 401 extends to the first interface, a second end of the elbow 401 extends to the second interface, the straight tube 402 is connected to the second end of the elbow 401, and the straight tube 402 is located in the outer tube 41 and is coaxially arranged with the outer tube 41. The length of the straight pipe 402 and the length of the outer pipe fitting 41 can be the same, so that the length and the angle of the straight pipe 402 or the outer pipe fitting 41 are calculated, and the other pipe fitting is copied and cut, so that the processing is convenient.

Alternatively, the straight tube 402 is arranged along the horizontal direction, that is, the exhaust tube assembly of the heat pump water heater adopts a side air inlet and outlet mode.

Optionally, the connection between the first interface of the three-way pipe fitting 30 and the air inlet 101, the connection between the elbow 401 and the air outlet cover 4011, the connection between the straight pipe 402 and the inner connecting pipe head, and the connection between the outer pipe 41 and the second interface of the three-way pipe fitting 30 are all connected and fixed in a plug-in fit manner, so that the installation of the exhaust pipe assembly is convenient, the on-site assembly operation can be further avoided, and the limitation of the limited space of an installation site is further avoided. Optionally, after the pipe fittings are inserted and installed, the joint is bonded by glue so as to improve the tightness of the joint.

In summary, the exhaust pipe assembly is integrally of a sleeve structure, and the heat insulation and noise reduction measures are only required to be performed on the outer pipe 41 and the three-way pipe 30, so that the entire exhaust pipe assembly can meet the heat insulation and noise reduction requirements.

In one embodiment, the exhaust pipe assembly further comprises a tail pipe assembly, the tail pipe assembly comprises a tail outer pipe 80 and a tail inner pipe 81, the tail outer pipe 80 is sleeved on the tail inner pipe 81, the tail outer pipe 80 is connected with one end of the outer pipe 41, which is away from the three-way pipe fitting 30, the tail inner pipe 81 is connected with one end of the inner pipe 40, which is away from the three-way pipe fitting 30, an air channel is arranged between the inner wall of the tail outer pipe 80 and the outer wall of the tail inner pipe 81, and the first air inlet channel 50 is communicated with the outside through the air channel. It will be appreciated that the tailpipe assembly and the sleeve assembly are designed separately to facilitate the installation in sections, thereby further improving the space constraints of the exhaust pipe assembly.

In one embodiment, the length of the tail inner tube 81 is greater than that of the tail outer tube 80, one end of the tail inner tube 81, which is close to the three-way pipe fitting 30, is flush with the end of the tail outer tube 80, the other end of the tail inner tube 81 protrudes from the tail outer tube 80, and the part of the tail inner tube 81 protruding from the tail outer tube 80 has a length of 20cm but not limited to 20cm, and in particular, the part is reasonably changed by the inventor according to the installation real scene. It will be appreciated that since the lengths and installation angles of the outer tube member 41 and the inner tube member 40 are the same, the length of the inner tube member 40 is designed to be longer than the length of the outer tube member 41, and the air intake from the first air intake passage 50 can be prevented from being affected by the air outlet.

Referring to fig. 1 and 3, in one embodiment, the tail outer tube 80 is provided with a first mounting portion, and the outer tube 41 is in plug-in fit with the first mounting portion. Specifically, the first installation department and tail outer tube 80 integrated into one piece, first installation department includes first changeover portion 802 and first annular linkage segment 8021, tail outer tube 80 and first annular linkage segment 8021 are connected respectively to first changeover portion 802, the internal diameter of first changeover portion 802 is by tail outer tube 80 to the gradual increase of first annular linkage segment 8021 direction, tail outer tube 80 peg graft in first annular linkage segment 8021, the internal diameter of first annular linkage segment 8021 is the same with the external diameter of tail outer tube 80, can be convenient for peg graft the cooperation between outer pipe 41 and the tail outer tube 80.

In one embodiment, referring to fig. 2 and 3, the tail inner tube 81 is provided with a second mounting portion, and the inner tube 40 is in plug-in fit with the second mounting portion. Specifically, the second mounting portion and the tail inner tube 81 are integrally formed, the second mounting portion includes a second transition section 812 and a second annular connecting section 8121, the second transition section 812 connects the tail inner tube 81 and the second annular connecting section 8121 respectively, the inner diameter of the second transition section 812 gradually increases from the tail inner tube 81 to the second annular connecting section 8121, the tail inner tube 81 is inserted into the second annular connecting section 8121, the inner diameter of the second annular connecting section 8121 is the same as the outer diameter of the tail inner tube 81, and the insertion fit between the inner tube 40 and the tail inner tube 81 can be facilitated.

In one embodiment, a first filter screen 801 is disposed in the tail outer tube 80 and the tail inner tube 81, the first filter screen 801 is annular, the outer side of the first filter screen 801 is connected with the inner wall of the tail outer tube 80, and the inner side of the first filter screen 801 is connected with the outer wall of the tail inner tube 81. Optionally, a second screen 811 is provided in the tail inner tube 81. It will be appreciated that foreign objects may be prevented from entering the tunnel by the first screen 801. Optionally, the first filter screen 801 is located on an end surface of the tail outer tube 80 facing away from the end of the outer tube 41, so that foreign objects on the first filter screen 801 can be cleaned in time. In addition, the second screen 811 prevents foreign matter from being discharged from the exhaust passage 60, and 5 prevents the surrounding environment from being polluted.

Example two

The difference between this embodiment and the first embodiment is that: the air inlet and outlet modes of the exhaust pipe assembly are different.

Referring to fig. 4, the inner pipe fitting 40 is disposed along a vertical direction, that is, the exhaust pipe assembly of the heat pump water heater adopts a top air inlet and outlet mode, the inner pipe fitting 40 of this embodiment includes a straight pipe fitting 403 and a straight pipe 402, that is, 0 is that the straight pipe fitting 403 is located in the three-way pipe fitting 30, one port of the straight pipe fitting 403 is in plug connection with the air outlet port of the air outlet cover 4011, and the other port of the straight pipe fitting 403 is in plug connection with one port of the straight pipe 402 located in the three-way pipe fitting 30.

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, 5 should be considered as the scope of the description of the present specification as long as the combinations of the technical features are not contradictory.

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 would be apparent to one of ordinary skill in the art that the present utility model could be practiced without departing from the inventive concepts

It is to be understood that variations and modifications may be made which fall within the scope of the utility model. Accordingly, the scope of protection of the patent of the utility model is subject to the appended claims.

Claims

1. The utility model provides an exhaust pipe assembly which characterized in that includes tee bend pipe fitting (30), inner tube (40) and outer tube (41), tee bend pipe fitting (30) have first interface, second interface and third interface, outer tube (41) with second interface connection, outer tube (41) cover is located inner tube (40), outer tube (41) with be formed with between inner tube (40) and communicate in outdoor first air inlet channel (50); one end of the inner pipe (40) extends into the three-way pipe (30) from the second connector and extends to the first connector, and an exhaust channel (60) communicated with the outside is formed in the inner pipe (40); a second air inlet channel (70) is formed between the inner pipe (40) and the three-way pipe (30), the second air inlet channel (70) is communicated with the first air inlet channel (50), and the second air inlet channel (70) is communicated with the room through the third interface.

2. The exhaust pipe assembly according to claim 1, further comprising a tail pipe assembly, the tail pipe assembly comprising a tail outer pipe (80) and a tail inner pipe (81), the tail outer pipe (80) being sleeved on the tail inner pipe (81), the tail outer pipe (80) being connected with one end of the outer pipe (41) facing away from the three-way pipe (30), the tail inner pipe (81) being connected with one end of the inner pipe (40) facing away from the three-way pipe (30), an air duct being provided between an inner wall of the tail outer pipe (80) and an outer wall of the tail inner pipe (81), the first air inlet channel (50) being in communication with the outside of the room through the air duct, and the exhaust channel (60) being in communication with the outside of the room through the tail inner pipe (81).

3. The exhaust pipe assembly according to claim 2, characterized in that the length of the tail inner pipe (81) is greater than the length of the tail outer pipe (80), one end of the tail inner pipe (81) close to the three-way pipe fitting (30) is flush with the end of the tail outer pipe (80), and the other end of the tail inner pipe (81) protrudes out of the tail outer pipe (80).

4. The exhaust pipe assembly according to claim 2, characterized in that the tail outer pipe (80) is provided with a first mounting part, and the outer pipe fitting (41) is in plug-in fit with the first mounting part; the tail inner pipe (81) is provided with a second installation part, and the inner pipe fitting (40) is in plug-in fit with the second installation part.

5. The exhaust pipe assembly according to claim 4, wherein the first mounting portion and the tail outer pipe (80) are integrally formed, the first mounting portion comprises a first transition section (802) and a first annular connecting section (8021), the first transition section (802) is respectively connected with the tail outer pipe (80) and the first annular connecting section (8021), the inner diameter of the first transition section (802) is gradually increased from the tail outer pipe (80) to the first annular connecting section (8021), the tail outer pipe (80) is inserted into the first annular connecting section (8021), and the inner diameter of the first annular connecting section (8021) is the same as the outer diameter of the tail outer pipe (80).

6. The exhaust pipe assembly according to claim 4, wherein the second mounting portion and the tail inner pipe (81) are integrally formed, the second mounting portion comprises a second transition section (812) and a second annular connecting section (8121), the second transition section (812) is respectively connected with the tail inner pipe (81) and the second annular connecting section (8121), the inner diameter of the second transition section (812) is gradually increased from the tail inner pipe (81) to the second annular connecting section (8121), the tail inner pipe (81) is inserted into the second annular connecting section (8121), and the inner diameter of the second annular connecting section (8121) is the same as the outer diameter of the tail inner pipe (81).

7. The exhaust pipe assembly according to claim 1, wherein the first interface and the third interface are coaxially arranged, the inner pipe fitting (40) comprises an elbow pipe (401) and a straight pipe, the elbow pipe (401) is located in the three-way pipe fitting (30), a first end of the elbow pipe (401) extends to the first interface, a second end of the elbow pipe (401) extends to the second interface, the straight pipe is connected with the second end of the elbow pipe (401), and the straight pipe is located in the outer pipe fitting (41) and coaxially arranged with the outer pipe fitting (41).

8. The exhaust pipe assembly according to claim 1, characterized in that the third port is detachably connected with a sleeve cover (31).

9. The exhaust pipe assembly according to claim 2, characterized in that a first filter screen (801) is arranged in the tail outer pipe (80) and the tail inner pipe (81), the first filter screen (801) is annular, the outer side of the first filter screen (801) is connected with the inner wall of the tail outer pipe (80), and the inner side of the first filter screen (801) is connected with the outer wall of the tail inner pipe (81);

and/or a second filter screen (811) is arranged in the tail inner pipe (81).

10. A heat pump water heater, characterized by comprising a main machine shell (10) and an exhaust pipe assembly according to any one of claims 1-9, wherein the main machine shell (10) is provided with an air inlet (101) and an air outlet, the air inlet (101) is arranged around the periphery of the air outlet, the first interface is connected with the air inlet (101), and one end of the inner pipe fitting (40) extending into the three-way pipe fitting (30) is connected with the air outlet.