CN220624415U

CN220624415U - Machine head assembly and heat pump water heater

Info

Publication number: CN220624415U
Application number: CN202322367644.1U
Authority: CN
Inventors: 彭锋; 杨勇刚; 李玉狮
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-03-19
Anticipated expiration: 2033-08-31

Abstract

The utility model discloses a machine head assembly and a heat pump water heater. The handpiece assembly includes: a carrier substrate; the lower volute is positioned above the bearing substrate and fixedly arranged on the bearing substrate; the upper volute module is fixedly arranged on the lower volute from the upper direction of the lower volute, the upper volute and the lower volute are encircled to form a volute air channel, and the wind wheel is positioned in the volute air channel; the upper volute is provided with a positioning part, the bearing substrate is provided with a matching part, and the positioning part is matched with the matching part so as to limit the upper volute module through the bearing substrate, so that the structural stability of the upper volute module is better; furthermore, when the motor is damaged, the heat pump water heater does not need to be disassembled on the hanging wall body, the upper volute module is disassembled from bottom to top on the machine head assembly, the motor can be disassembled, and the motor disassembling process is simpler and more convenient.

Description

Machine head assembly and heat pump water heater

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a machine head assembly and a heat pump water heater.

Background

In the existing heat pump water heater, the maintenance probability of the electric control module of the head assembly is highest, so the electric control module is usually designed at the front part of the head assembly (far away from the hanging wall body), the fan module is designed at the rear part of the head assembly (close to the hanging wall body), the heat exchanger is arranged between the electric control module and the fan module, and the compressor is positioned at one side of the heat exchanger, which is opposite to the fan module. The fan module comprises an air duct rear cover, a motor, a wind wheel and an air duct front cover, wherein the electric control module, the compressor, the heat exchanger and the air duct front cover are sequentially arranged from front to back and are all fixed on a water receiving disc at the bottom of the machine head assembly, the motor is fixed in the air duct front cover, the wind wheel is positioned at the rear side of the motor and is arranged on a rotating shaft of the motor, the air duct rear cover is positioned at the rear side of the air duct front cover and is fixed on the air duct front cover from back to front through screws, the air duct rear cover and the air duct front cover encircle to form an air duct, and the outer parts of the electric control module, the compressor, the heat exchanger and the fan module are covered with decorative covers.

When the motor fails, maintenance personnel need empty the water in the heat pump water heater first, then detach the heat pump water heater on the wall body of hanging, place subaerial, then demolish decorative cover, wind channel back cover and wind wheel in proper order, just can dismantle the motor and maintain or change, its dismouting motor process is complicated, the degree of difficulty is big.

Disclosure of Invention

The embodiment of the utility model provides a machine head assembly for a heat pump water heater, which comprises the following components: a carrier substrate; the lower volute is positioned above the bearing substrate and fixedly arranged on the bearing substrate; the upper volute module is fixedly arranged on the lower volute from the upper direction of the lower volute, the upper volute and the lower volute form a volute air channel in a surrounding mode, and the wind wheel is positioned in the volute air channel; the upper volute is provided with a positioning part, the bearing substrate is provided with a matching part, and the positioning part is matched with the matching part.

In some exemplary embodiments, one of the positioning portion and the mating portion is a positioning rib, and the other is a mating groove, and the positioning rib and the mating groove are in plug connection in an up-down direction.

In some exemplary embodiments, the upper volute is provided with a first boss, the positioning portion is provided on the first boss, the bearing substrate is provided with a second boss, and the mating portion is provided on the second boss.

In some exemplary embodiments, the handpiece assembly further comprises: the heat exchanger is fixedly arranged on the bearing substrate, one end, close to the heat exchanger, of the lower volute is fixedly connected with the side plate of the heat exchanger, and one end, far away from the heat exchanger, of the lower volute is fixedly connected with the second boss.

In some exemplary embodiments, the lower volute is of unitary construction and includes: a vertical plate part vertically arranged along the up-down direction and provided with a wind through hole; the air guide ring part is positioned in the air passing hole and is integrally connected with the hole wall of the air passing hole; and the lower volute cover part is integrally connected with the lower part of the first side of the vertical plate part, the lower volute cover part and the lower part of the vertical plate part are surrounded to form a lower containing groove with an upward notch, the lower part of the air guide ring part is positioned on the side wall of the lower containing groove, the upper volute and the upper part of the vertical plate part are surrounded to form an upper containing groove with a downward notch, the upper part of the air guide ring part is positioned on the side wall of the upper containing groove, and the lower containing groove and the upper containing groove are surrounded to form the volute air duct.

In some exemplary embodiments, the lower volute further comprises: and the wind deflector part is transversely arranged and integrally connected with the upper part of the second side of the vertical plate part, and the wind guide ring part is positioned below the wind deflector part.

In some exemplary embodiments, the top surface of the wind deflector portion is provided with a wire clamping structure.

In some exemplary embodiments, the lower volute further comprises: and the reinforcing plate part is vertically arranged along the up-down direction, is positioned on the second side of the vertical plate part and below the wind deflector part, and the wind deflector part and the vertical plate part are integrally connected with the reinforcing plate part.

In some exemplary embodiments, the lower volute section includes: an arc-shaped wall with a concave side facing upwards, and one end adjacent to the vertical plate part is integrally connected with the lower part of the vertical plate part; and the end wall is positioned on one side of the arc-shaped wall away from the vertical plate part and is integrally connected with one end of the arc-shaped wall away from the vertical plate part, and the lower part of the vertical plate part, the arc-shaped wall and the end wall are surrounded to form the lower accommodating groove.

The embodiment of the utility model also provides a heat pump water heater, which comprises the machine head assembly in any embodiment.

The machine head assembly provided by the embodiment of the utility model has the advantages that the upper volute is provided with the positioning part, the bearing substrate is provided with the matching part, and the positioning part is matched with the matching part, so that the upper volute module is limited by the bearing substrate with higher structural strength, the structural stability of the upper volute module is better, shaking and abnormal sound are not easy to occur after a drop test, and the upper volute module is not easy to break and the upper volute module is not easy to crush the lower volute when the drop test is performed; furthermore, the machine head assembly is used for the heat pump water heater, and is arranged on the upper portion of the water tank assembly of the heat pump water heater, when the motor is damaged, the heat pump water heater does not need to be disassembled on the hanging wall body, the upper volute module only needs to be disassembled from bottom to top on the machine head assembly, then the motor can be disassembled on the ground by disassembling the upper volute module, and the motor disassembling and assembling process is simple and low in difficulty.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate and do not limit the utility model.

FIG. 1 is a schematic perspective view of a handpiece assembly provided in some embodiments;

FIG. 2 is a schematic view of an assembly of the handpiece assembly of FIG. 1;

FIG. 3 is a schematic view of another assembly of the handpiece assembly of FIG. 1;

FIG. 4 is an exploded view of the handpiece assembly of FIG. 1;

FIG. 5 is a schematic perspective view of the upper volute of FIG. 4;

FIG. 6 is a schematic perspective view of the lower volute of FIG. 4;

FIG. 7 is a schematic perspective view of the upper carrier substrate of FIG. 4;

FIG. 8 is a schematic rear view of the carrier, upper volute and lower volute of FIG. 1 assembled;

FIG. 9 is a schematic cross-sectional view of the structure shown in FIG. 8;

fig. 10 is an enlarged schematic view of the portion a in fig. 9.

Wherein, the correspondence between the reference numerals and the component names is:

100 lower volute, 110 vertical plate part, 120 wind guiding ring part, 130 lower volute cover part, 131 arc-shaped wall, 132 end wall, 140 lower holding groove, 150 wind shielding plate part, 151 wire clamping structure, 160 reinforcing plate part, 200 upper volute, 210 upper holding groove, 240 holding rib, 250 first boss, 260 positioning part, 300 motor, 400 wind wheel, 500 heat exchanger, 700 bearing base body, 710 second boss and 720 matching part.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

The embodiment of the present utility model provides a lower volute 100, as shown in fig. 6, the lower volute 100 is an integral injection molding structure, and the lower volute 100 includes: a riser portion 110, the riser portion 110 being provided with a wind passing hole; the wind guide ring part 120, the wind guide ring part 120 is positioned in the wind passing hole and is integrally connected with the hole wall of the wind passing hole; and a lower volute cover part 130, wherein the lower volute cover part 130 is positioned at the lower part of the first side of the vertical plate part 110 and is integrally connected with the vertical plate part 110, the lower volute cover part 130 and the lower part of the vertical plate part 110 are surrounded into a lower containing groove 140 with a notch upwards, and the lower part of the wind guide ring part 120 is positioned at the side wall of the lower containing groove 140.

The lower volute 100 integrates the vertical plate part 110, the air guide ring part 120 and the lower volute cover part 130 integrally, so that air leakage can not occur between the vertical plate part 110 and the lower volute cover part 130, and the lower volute 100 is applied to a heat pump water heater, and the heat pump water heater is lower in assembly difficulty and better in heating performance.

Wherein an end of the lower volute component 130 facing the riser component 110 is integrally connected with a lower portion of the first side of the riser component 110 (i.e., a lower portion of the rear side of the riser component 110).

As shown in fig. 1 to 4 and 6, the lower volute section 130 may include: an arc wall 131, the concave side of the arc wall 131 facing upward and the convex side facing downward, and one end of the arc wall 131 adjacent to the riser portion 110 is integrally connected with the riser portion 110; and an end wall 132, the end wall 132 is located at one side of the arc-shaped wall 131 away from the riser portion 110, and the end wall 132 is integrally connected with one end of the arc-shaped wall 131 away from the riser portion 110, and the lower portion of the riser portion 110, the arc-shaped wall 131 and the end wall 132 are jointly surrounded to form a lower receiving groove 140. The lower volute component 130 is simple in construction and easy to injection mold.

In some exemplary embodiments, as shown in fig. 6, the lower volute 100 further comprises: and a wind deflector portion 150, the wind deflector portion 150 being disposed horizontally and integrally connected to an upper portion of the second side of the riser portion 110, and the wind deflector portion 120 being located below the wind deflector portion 150. The lower scroll case 100 is applied to a heat pump water heater, a heat exchanger 500 is disposed under a wind shield part 150, and the wind shield part 150 serves to prevent the heat exchanger 500 from leaking upward.

The rear end edge of the wind deflector portion 150 is integrally connected with the upper portion of the second side of the riser portion 110 (i.e., the upper edge of the front side of the riser portion 110), so that no air leakage occurs between the riser portion 110 and the wind deflector portion 150, and therefore, the lower volute 100 is applied to a heat pump water heater, which is less difficult to assemble and better in heating performance.

In some examples, as shown in fig. 1 and 6, the top surface of the wind guard portion 150 is provided with a wire clamping structure 151, the lower volute 100 is applied to a heat pump water heater, and internal wires of a head assembly of the heat pump water heater can be integrated through the wire clamping structure 151, so that the problem of messy internal wires of the head portion can be solved.

However, as shown in fig. 1 and fig. 6, the wire clamping structure 151 includes a wire clamping groove, a wire clamping buckle, and/or a wire clamping hole, which can all achieve the purposes of the present application, and the spirit of the present application is not departing from the design concept of the present utility model, and the present application shall not be repeated herein.

In some examples, as shown in fig. 6, the lower volute 100 further comprises: and a reinforcing plate portion 160, wherein the reinforcing plate portion 160 is vertically arranged on the second side of the riser portion 110 and below the wind deflector portion 150, and the wind deflector portion 150 and the riser portion 110 are integrally connected with the reinforcing plate portion 160, so that the structural strength of the wind deflector portion 150 can be improved, and the wind deflector portion 150 is less prone to breaking and being damaged in the transportation and carrying processes.

It may be that, as shown in fig. 6, only one reinforcing plate portion 160 is provided, and the reinforcing plate portion 160 is located at the left side of both the wind deflector portion 150 and the riser portion 110 (or, the reinforcing plate portion 160 is located at the right side of both the wind deflector portion 150 and the riser portion 110); alternatively, two reinforcement plate portions 160 are provided, and the wind deflector portion 150 is located between the two reinforcement plate portions 160, so that the structural strength of the wind deflector portion 150 can be improved; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present utility model, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.

As shown in fig. 1 to 10, an embodiment of the present utility model further provides a handpiece assembly, including: a carrier substrate 700; the lower volute 100, the lower volute 100 is positioned above the bearing base 700 and fixedly arranged on the bearing base 700; the upper volute module comprises an upper volute 200, a motor 300 and a wind wheel 400, the motor 300 is fixedly arranged on the upper volute 200, the wind wheel 400 is in transmission connection with a rotating shaft of the motor 300, the upper volute module is fixedly arranged on the lower volute 100 from the upper side of the lower volute 100, the upper volute 200 and the lower volute 100 are encircled to form a volute air channel, and the wind wheel 400 is positioned in the volute air channel; the upper volute 200 is provided with a positioning portion 260, the bearing substrate 700 is provided with a mating portion 720, and the positioning portion 260 mates with the mating portion 720 in the up-down direction, so as to prevent the upper volute 200 from shaking in the horizontal direction relative to the lower volute 100.

The machine head assembly is characterized in that the upper volute 200 is provided with a positioning part 260, the bearing substrate 700 is provided with a matching part 720, the positioning part 260 is matched with the matching part 720 in the up-down direction, and the machine head assembly is used for preventing the upper volute module (the upper volute is integrated with a motor and a wind wheel, so that the inertia of the upper volute module is relatively large, the stability is relatively poor, the lower volute is a plastic part, the upper volute module cannot be effectively limited), and the upper volute module is limited by adopting the bearing substrate with relatively high structural strength; furthermore, the head assembly is used for the heat pump water heater, and is arranged on the upper portion of the water tank assembly of the heat pump water heater, when the motor 300 is damaged, the heat pump water heater does not need to be disassembled on a hanging wall body, the upper volute module only needs to be disassembled from top to bottom on the head assembly, then the motor 300 can be disassembled by disassembling the upper volute module on the ground, and the motor 300 is simple in disassembling and assembling process and low in difficulty.

As shown in fig. 1 to 4 and 7, the supporting substrate 700 is a water pan. As shown in fig. 9 and 10, the positioning portion 260 and the mating portion 720 may be connected in a plugging manner (such as a plug connection scheme of a dowel and a slot); or, the positioning portion 260 and the mating portion 720 may be in a snap connection (such as a snap connection scheme of a snap rib and a snap groove); alternatively, the positioning portion 260 and the mating portion 720 may be in a threaded connection (such as a threaded connection scheme of a through hole, a screw hole and a screw, or a screw is screwed into the screw hole by passing through the through hole downwards), etc.; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present utility model, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.

In some embodiments, as shown in fig. 5, 7, 9 and 10, the positioning portion 260 is set as a positioning rib, the mating portion is set as a mating groove, the bearing substrate 700 is provided with a second boss 710, the top of the second boss 710 is provided with a downward concave mating groove, the upper volute 200 is provided with a first boss 250 protruding backward, the bottom of the first boss 250 is provided with a downward protruding positioning rib, the first boss 250 is located above the second boss 710, and the positioning rib is inserted downward in the mating groove (at this time, the first boss 250 and the second boss 710 are abutted or separated), so that the scheme is simple in structure and easy to manufacture. Preferably, the positioning ribs are wedge-shaped positioning ribs, and the matching grooves are wedge-shaped matching grooves, so that the limit in the horizontal direction and the height direction is realized simultaneously.

Of course, the top of the second boss may be provided with an upward protruding positioning rib, and the bottom of the first boss is provided with an upward recessed matching groove, which may also achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present utility model, and is not described herein again, and should also belong to the protection scope of the present application.

Wherein, as shown in fig. 1 to 4, the handpiece assembly further includes: and the heat exchanger 500, the heat exchanger 500 is positioned at one side (i.e. the front side) of the lower volute 100 and fixedly arranged on the bearing substrate 700, one end of the lower volute 100 adjacent to the heat exchanger 500 is fixedly connected with a side plate of the heat exchanger 500, and one end of the lower volute 100 far away from the heat exchanger 500 is fixedly connected with the second boss 710.

The side plate of the heat exchanger 500 is provided with a buckling position, one end of the lower volute 100 adjacent to the heat exchanger 500 is provided with a buckle, and the buckle is clamped at the buckling position; alternatively, the side plate of the heat exchanger 500 may be provided with a screw hole, one end of the lower volute 100 adjacent to the heat exchanger 500 is provided with a through hole, and a screw is screwed into the screw hole through the through hole; the second boss 710 may be provided with a through hole, and one end of the lower volute 100 far away from the heat exchanger 500 is provided with a screw hole, and a screw is screwed into the screw hole from the back to the front through the through hole; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present utility model, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.

Alternatively, as shown in fig. 3, the heat exchanger 500 is first mounted on the carrier substrate 700, and then the lower volute 100 is mounted on the carrier substrate 700; or, as shown in fig. 2, the heat exchanger and the lower volute 100 are assembled together, and then the combined structure of the heat exchanger and the lower volute 100 is mounted on the bearing substrate 700; the purpose of the present application can be achieved without departing from the design concept of the present utility model, and the present utility model is not repeated herein, and all the objects are within the scope of the present application.

As shown in fig. 1 to 4 and 6, the lower volute 100 is the lower volute 100 provided in any of the foregoing embodiments, and then: the upper volute 200 is arranged on the upper portion of the first side of the vertical plate part 110 and is abutted against the lower volute cover part 130, an upper accommodating groove 210 with a downward notch is formed by the upper volute 200 and the upper portion of the vertical plate part 110 in a surrounding mode, the upper portion of the wind guiding ring part 120 is arranged on the side wall of the upper accommodating groove 210, the wind wheel 400 is opposite to the inner hole of the wind guiding ring part 120, the upper portion of the wind wheel 400 is arranged on the upper accommodating groove 210, the lower portion of the wind wheel 400 is arranged on the lower accommodating groove 140, the upper accommodating groove 210 and the lower accommodating groove 140 are formed by surrounding a volute air channel in a surrounding mode, an air outlet of the volute air channel is formed in the top of the upper volute 200, and the wind wheel 400 is arranged on a transmission shaft of the motor 300. Thus, the handpiece assembly provided in the embodiment of the present utility model further has all the advantages of the lower volute 100 provided in any one of the above embodiments, and will not be described herein.

In some embodiments, as shown in fig. 2, 5 and 6, the top of the upper volute 200 further extends forward to form a holding rib 240, the holding rib 240 abuts against the top surface of the wind guard portion 150, and then a screw passes through the holding rib 240 from top to bottom to be screwed on the wind guard portion 150, so that the front part of the upper volute 200 and the front part of the lower volute 100 are fixedly connected, and thus the connection strength of the upper volute 200 and the lower volute 100 is better, and the stability after connection is better.

Of course, the position where the upper volute 200 and the lower volute 100 are butted can be provided with a clamping structure or an inserting structure, etc., so that the purpose of the application can be achieved, the purpose of the application is not departing from the design concept of the utility model, and the application shall be protected without repeated description.

The embodiment of the utility model also provides a heat pump water heater (not shown in the figure), which comprises the machine head assembly of any embodiment.

The heat pump water heater has all the advantages of the head assembly provided by any one of the embodiments, and is not described herein.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "one side", "the other side", "one end", "the other end", "the side", "the opposite", "four corners", "the periphery", "the" mouth "character structure", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus are not to be construed as limiting the present utility model.

In the description of embodiments of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Although the embodiments of the present utility model are described above, the embodiments are only used for facilitating understanding of the present utility model, and are not intended to limit the present utility model. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.

Claims

1. A head assembly for a heat pump water heater, comprising:

a carrier substrate;

the lower volute is positioned above the bearing substrate and fixedly arranged on the bearing substrate; and

the upper volute module comprises an upper volute, a motor and a wind wheel, the motor is fixedly arranged on the upper volute, the wind wheel is in transmission connection with a rotating shaft of the motor, the upper volute module is fixedly arranged on the lower volute downwards from the upper direction of the lower volute, the upper volute and the lower volute are encircled to form a volute air channel, and the wind wheel is positioned in the volute air channel;

the upper volute is provided with a positioning part, the bearing substrate is provided with a matching part, and the positioning part is matched with the matching part.

2. The handpiece assembly of claim 1, wherein one of the positioning portion and the mating portion is a positioning rib and the other is a mating groove, and the positioning rib is in plug connection with the mating groove in an up-down direction.

3. The head assembly according to claim 1 or 2, wherein the upper volute is provided with a first boss, the positioning portion is provided on the first boss, the bearing substrate is provided with a second boss, and the mating portion is provided on the second boss.

4. The handpiece assembly of claim 3, further comprising:

the heat exchanger is fixedly arranged on the bearing substrate, one end, close to the heat exchanger, of the lower volute is fixedly connected with the side plate of the heat exchanger, and one end, far away from the heat exchanger, of the lower volute is fixedly connected with the second boss.

5. The hand piece assembly of claim 1 or 2, wherein the lower volute is of unitary construction and comprises:

a vertical plate part vertically arranged along the up-down direction and provided with a wind through hole;

the air guide ring part is positioned in the air passing hole and is integrally connected with the hole wall of the air passing hole; and

the lower volute cover part is integrally connected with the lower part of the first side of the vertical plate part, the lower volute cover part and the lower part of the vertical plate part are surrounded to form a lower containing groove with an upward notch, the lower part of the air guide ring part is positioned on the side wall of the lower containing groove, the upper volute and the upper part of the vertical plate part are surrounded to form an upper containing groove with a downward notch, the upper part of the air guide ring part is positioned on the side wall of the upper containing groove, and the lower containing groove and the upper containing groove are surrounded to form the volute air duct.

6. The hand piece assembly of claim 5, wherein the lower volute further comprises:

and the wind deflector part is transversely arranged and integrally connected with the upper part of the second side of the vertical plate part, and the wind guide ring part is positioned below the wind deflector part.

7. The nose assembly of claim 6, wherein the top surface of the wind deflector portion is provided with a wire-clamping structure.

8. The hand piece assembly of claim 6, wherein the lower volute further comprises:

and the reinforcing plate part is vertically arranged along the up-down direction, is positioned on the second side of the vertical plate part and below the wind deflector part, and the wind deflector part and the vertical plate part are integrally connected with the reinforcing plate part.

9. The hand piece assembly of claim 5, wherein the lower volute section comprises:

an arc-shaped wall with a concave side facing upwards, and one end adjacent to the vertical plate part is integrally connected with the lower part of the vertical plate part; and

the end wall is positioned on one side of the arc-shaped wall, which is far away from the vertical plate part, and is integrally connected with one end of the arc-shaped wall, which is far away from the vertical plate part, and the lower part of the vertical plate part, the arc-shaped wall and the end wall are surrounded to form the lower accommodating groove.

10. A heat pump water heater comprising a head assembly as claimed in any one of claims 1 to 9.