Heat pump unit indoor unit

Abstract

The application provides a heat pump unit indoor unit, comprising: a casing, which defines an accommodating cavity inside; the casing comprises a back plate, which closes the back side of the accommodating cavity; an electrical box, a heat exchanger and a heat exchanger mounting rack are installed in the accommodating cavity; the electrical box is connected with the back plate and located at the upper part of the accommodating cavity; the heat exchanger is arranged in the accommodating cavity and below the electrical box; the heat exchanger mounting rack is connected with the heat exchanger; the heat exchanger mounting rack is arranged along the height direction of the casing; the top of the heat exchanger mounting rack is connected with the bottom of the electrical box; and the heat exchanger mounting rack is connected with the back plate, so that the heat exchanger mounting rack, the electrical box and the back plate are connected to form a whole. By connecting the electrical box, the heat exchanger mounting rack and the casing, a firm connection structure is formed, and the structural strength and use reliability of the indoor unit are effectively improved.

Description

Technical Field

[0001] This application relates to the field of heat pump equipment technology, and in particular to an indoor unit of a heat pump unit. Background Technology

[0002] A heat pump unit is a device that absorbs heat from a low-temperature heat source and transfers it to a high-temperature heat source to achieve cooling, heating, or hot water supply. It is commonly used in heating, cooling, and domestic hot water applications. Compared to traditional electric or gas heating methods, heat pump units offer advantages such as high energy efficiency and environmental friendliness, making them widely used in residential buildings, commercial buildings, and industrial facilities.

[0003] A heat pump unit typically consists of an indoor unit and an outdoor unit. The indoor unit usually houses components such as a heat exchanger, electrical box, expansion tank, water pipes, and refrigerant pipes. The water and refrigerant pipes connect to the heat exchanger, and during operation, water and refrigerant exchange heat in the heat exchanger, thereby heating or cooling the indoor air or water supply.

[0004] However, the components inside the indoor unit of existing heat pump units are installed and fixed independently, resulting in weak overall structural stability. During transportation or installation, they are easily subjected to vibration or impact, which can cause them to loosen or shift, affecting the stability of equipment operation and service life. Utility Model Content

[0005] In view of at least one deficiency in the related technology, this application provides a heat pump unit indoor unit that forms a robust connection structure by connecting the electrical box, heat exchanger mounting bracket and casing, thereby effectively improving the structural strength and reliability of the indoor unit.

[0006] This application provides an indoor unit for a heat pump system, comprising: The housing defines a receiving cavity inside the housing, and the housing includes a back plate that closes the rear side of the receiving cavity; The electrical box is connected to the back panel and located at the top of the receiving cavity; The heat exchanger is located inside the housing cavity and below the electrical box; A heat exchanger mounting bracket is connected to the heat exchanger. The heat exchanger mounting bracket is set along the height direction of the casing. The top of the heat exchanger mounting bracket is connected to the bottom of the electrical box, and the heat exchanger mounting bracket is connected to the back plate, so that the heat exchanger mounting bracket, electrical box and back plate are connected to form a whole.

[0007] In the above technical solution, the top of the heat exchanger mounting bracket is connected to the bottom of the electrical box, which not only ensures the stable installation of the heat exchanger but also supports and fixes the electrical box. The electrical box is located in the upper part of the casing, and the heat exchanger mounting bracket is located in the lower part of the casing. Since the heat exchanger mounting bracket, electrical box, and back panel are interconnected to form an integral structure, while ensuring the realization of their respective functions, the indoor unit as a whole forms a solid connecting frame, thereby effectively improving the structural strength and reliability of the indoor unit.

[0008] In some embodiments, the electrical box includes a box back panel facing the back panel; the indoor unit of the heat pump unit also includes an electrical box bracket, one end of which is connected to the box back panel and the other end of which is connected to the back panel, and a reserved space is formed by the box back panel, the back panel and the electrical box bracket.

[0009] In the above technical solution, by installing an electrical box bracket between the back panel of the electrical box and the back panel of the housing, the electrical box is brought closer to the opening on the front side of the housing, which facilitates wiring or maintenance of the electrical box. At the same time, a reserved space is formed between the back panel of the box, the back panel and the electrical box bracket, which can be used to install other components, so that the space in the thickness direction of the housing is fully utilized and the utilization rate of the internal space of the unit is improved.

[0010] In some embodiments, the appliance box bracket includes two support plates connected to each other and arranged at an angle. Each support plate is bent at the edge near the back plate of the box to form a first support portion. The first support portion is abutted against and fixedly connected to the back plate of the box. Each support plate is provided with a second support portion near the edge of the back plate. The second support portion is abutted against and fixedly connected to the back plate.

[0011] In the above technical solution, the electrical box bracket is designed as two interconnected support plates, which can form a stable support function, while reducing the space occupied between the back plates of the box and increasing the volume of the reserved space; the two ends of the electrical box bracket form surface contact with the back plates of the box at the assembly position through the first support part and the second support part, respectively, improving the reliability of the assembly and the stability of the electrical box support.

[0012] In some embodiments, there are two electrical box brackets, which are respectively installed on both sides of the back panel of the box body in the width direction of the housing; in each electrical box bracket, the edge of one support plate near the back panel of the box body is aligned with the upper edge of the back panel of the box body, and the edge of the other support plate near the back panel of the box body is aligned with the side edge of the back panel of the box body in the width direction of the housing.

[0013] In the above technical solution, two electrical box brackets are used to support the back panel of the box on both sides, so that the electrical box can be stably supported in the width direction, improving the stability of the electrical box installation; the edges of the two support plates in each electrical box bracket are aligned with the top edge and side edge of the back panel of the box, respectively, forming a continuous reserved space between the back panels of the box, maximizing the volume of the reserved space and improving the capacity of the reserved space.

[0014] In some embodiments, the electrical box further includes a box side plate extending from the edge of the box back plate in a direction away from the back plate, the box side plate including a lower side plate near the heat exchanger mounting bracket; the heat exchanger mounting bracket includes a first mounting plate near the electrical box, the first mounting plate extending along the thickness direction of the housing and opposite to the lower side plate, the front surface of the first mounting plate away from the back plate abutting against the rear surface of the lower side plate near the back plate; a limiting plate is provided on the first mounting plate, the limiting plate is located on the rear side of the box back plate and abutting against the box back plate, and an extension plate is provided on the edge of the first mounting plate away from the back plate, the extension plate abutting against and fixedly connected to the lower side plate.

[0015] In the above technical solution, the limiting plate on the rear side of the back panel of the box plays a limiting role on the electrical box, preventing the lower side panel of the electrical box from sliding backward relative to the first mounting plate. With the fixed connection between the extension plate on the front side of the first mounting plate and the lower side panel, the overall position of the electrical box is fixed, which can effectively limit the lateral and vertical displacement of the electrical box, making the installation of the electrical box more stable and improving the reliability of the connection.

[0016] In some embodiments, the heat exchanger mounting bracket further includes a second mounting plate. The second mounting plate extends from one side edge of the first mounting plate along the thickness direction of the housing towards the side away from the electrical box. The side edge of the second mounting plate near the back plate is provided with a plurality of plug-in portions. The back plate is provided with a plurality of plug-in interfaces through the corresponding plug-in portions. The plug-in portions are inserted into the corresponding plug-in interfaces to restrict the movement of the heat exchanger mounting bracket.

[0017] In the above technical solution, the installation position of the heat exchanger mounting bracket on the back plate can be initially positioned by the cooperation of the plug-in part and the plug interface, thereby simplifying the assembly operation, improving the installation efficiency, and helping to ensure the installation accuracy and overall structural stability of the heat exchanger mounting bracket.

[0018] In some embodiments, the housing further includes a base plate connected to a back plate and enclosing the bottom of the receiving cavity. A first water inlet and a second water inlet are provided on the base plate. A heat exchanger mounting bracket is disposed on one side near the width direction of the housing. The receiving cavity includes an installation space located below the electrical box and on the opposite side of the heat exchanger. The heat exchanger includes a first water inlet and a second water inlet. The first water inlet is near the top of the heat exchanger and is connected to a first water pipe. The first water pipe extends along the top of the installation space toward the opposite side of the heat exchanger. The end of the first water pipe away from the heat exchanger is connected to a second water pipe. The second water pipe extends along the side of the installation space away from the heat exchanger and is connected to the first water inlet. The second water inlet is near the bottom of the heat exchanger and is connected to a third water pipe. The third water pipe extends along the bottom of the installation space toward the opposite side of the heat exchanger and is connected to the second water inlet. A clearance area is formed between the first water pipe, the second water pipe, and the third water pipe, and an expansion tank is installed in the clearance area.

[0019] In the above technical solution, the overall layout of the system has been optimized. The heat exchanger is positioned closer to the housing cavity, maximizing the installation space below the electrical box and opposite the heat exchanger. The water system piping connecting to the heat exchanger is located on the opposite side, making full use of the unit's width to meet requirements such as pipe bending length. The water pipes are laid along the edge of the installation space, and the expansion tank is installed in the center of the installation space. There are no other components obstructing the opening between the expansion tank and the front of the casing, facilitating daily maintenance and inspection of the expansion tank. Through this approach, the components are rationally arranged inside the unit, making full use of the unit's width, height, and thickness, resulting in a more compact and rational system layout. This effectively reduces the overall size of the indoor unit, allowing for convenient installation in closets or confined spaces, meeting the needs of compact installation environments.

[0020] In some embodiments, a first refrigerant inlet and a second refrigerant inlet are provided on the base plate, and the first refrigerant inlet and the second refrigerant inlet are close to the heat exchanger relative to the first water inlet and the second water inlet; the heat exchanger also includes a first refrigerant interface and a second refrigerant interface, a first refrigerant pipe is connected between the first refrigerant interface and the first refrigerant inlet, and a second refrigerant pipe is connected between the second refrigerant interface and the second refrigerant inlet, and the first refrigerant pipe and the second refrigerant pipe are arranged between the expansion tank and the heat exchanger.

[0021] In the above technical solution, the refrigerant pipeline is laid close to the heat exchanger, which effectively reduces the length of the refrigerant pipeline. At the same time, the expansion tank is avoided, which makes full use of the internal size of the unit, realizes the compact layout of the internal structure, and improves the overall energy efficiency and operational reliability of the system.

[0022] In some embodiments, the expansion tank is mounted on the back plate via an expansion tank mounting bracket. The expansion tank mounting bracket includes a fixing plate, which is disposed opposite to the back plate. A positioning part is provided on the fixing plate, and the positioning part faces the expansion tank. A hanging plate is provided on the side of the expansion tank near the fixing plate. The hanging plate includes an extension plate extending from the expansion tank to the fixing plate and an assembly plate located at the edge of the extension plate. The assembly plate is abutted against and fixedly connected to the fixing plate. A first snap-fit ​​part is provided through the connection between the extension plate and the assembly plate, and the positioning part is inserted into the first snap-fit ​​part. A second snap-fit ​​part is provided through the back plate. The fixing plate and the back plate are spaced apart. Extensions extending to the back plate are formed on both sides of the fixing plate. Hooks are provided on the extensions. The hooks include a connecting section connected to the extension and a bent section connected to the connecting section. The connecting section passes through the second snap-fit ​​part, and the bent section and the extension are respectively located on both sides of the back plate.

[0023] In the above technical solution, the expansion tank is first installed on the expansion tank mounting bracket. The positioning part on the fixing plate is used to position the expansion tank to be installed, and then nails are driven and tightened. Subsequently, the expansion tank mounting bracket is initially positioned on the back plate by using the cooperation of the hook on the expansion tank mounting bracket and the second snap-fit ​​part on the back plate, and then the connection is tightened, making the installation and disassembly of the expansion tank more convenient.

[0024] This application also provides an indoor unit for a heat pump unit, including: The housing defines a receiving cavity inside the housing. The housing includes a back plate that closes the rear side of the receiving cavity. The back plate includes a first mounting area and a second mounting area that are arranged side by side in the height direction of the housing. An electrical box is located within a receiving cavity and connected to a first mounting area; A heat exchanger mounting bracket is used to install a heat exchanger. The heat exchanger mounting bracket is set along the height direction of the casing and connected to the second mounting area. The heat exchanger mounting bracket is adjacent to and connected to the electrical box, so that the first mounting area, the electrical box, the heat exchanger mounting bracket and the second mounting area are sequentially connected to form a whole.

[0025] In the above technical solution, the top of the heat exchanger mounting bracket is connected to the bottom of the electrical box, which not only ensures the stable installation of the heat exchanger but also supports and fixes the electrical box. The electrical box is located in the upper part of the casing, and the heat exchanger mounting bracket is located in the lower part of the casing. Since the heat exchanger mounting bracket, electrical box, and back panel are interconnected to form an integral structure, while ensuring the realization of their respective functions, the indoor unit as a whole forms a solid connecting frame, thereby effectively improving the structural strength and reliability of the indoor unit. Attached Figure Description

[0026] Figure 1 A perspective view of the indoor unit of a heat pump unit provided in an embodiment of this application; Figure 2This is a schematic diagram showing the opening of the cover of the indoor unit of the heat pump unit provided in an embodiment of this application; Figure 3 This is a front view of the indoor unit of the heat pump unit provided in an embodiment of this application; Figure 4 A perspective view of the indoor unit of a heat pump unit after the cover plate has been removed, as provided in an embodiment of this application. Figure 5 This is a front view of the indoor unit of the heat pump unit after the cover plate has been removed, as provided in the embodiment of this application. Figure 6 This is a three-dimensional representation of the assembly state of the back plate and the various components within the receiving cavity in the embodiments of this application. Figure 1 ; Figure 7 This is a three-dimensional representation of the assembly state of the back plate and the various components within the receiving cavity in the embodiments of this application. Figure 2 ; Figure 8 This is a side view of the assembly state of the back plate and the components inside the receiving cavity in an embodiment of this application; Figure 9 This is a three-dimensional representation of the assembly state of the back plate and the various components within the receiving cavity in the embodiments of this application. Figure 3 ; Figure 10 The three-dimensional representation of the back plate, electrical box bracket, electrical box, and heat exchanger mounting bracket in the embodiments of this application. Figure 1 ; Figure 11 for Figure 10 Exploded view of the structure shown; Figure 12 The three-dimensional representation of the back plate, electrical box bracket, electrical box, and heat exchanger mounting bracket in the embodiments of this application. Figure 2 ; Figure 13 for Figure 12 Enlarged view of the layout of the central part A; Figure 14 for Figure 12 Exploded view of the structure shown; Figure 15 The three-dimensional representation of the back plate, electrical box bracket, electrical box, and heat exchanger mounting bracket in the embodiments of this application. Figure 3 ; Figure 16 This is a side view of the back plate, electrical box bracket, electrical box, and heat exchanger mounting bracket in the embodiments of this application; Figure 17 for Figure 16 A magnified view of part B in the middle; Figure 18 This is an exploded view of the back panel and the electrical box bracket in an embodiment of this application; Figure 19This is an assembly drawing of the back plate, expansion tank mounting bracket, and expansion tank in an embodiment of this application; Figure 20 for Figure 19 Exploded view of the structure shown; Figure 21 This is an exploded view of the expansion tank and expansion tank mounting bracket in an embodiment of this application; Figure 22 for Figure 21 A magnified view of part C in the middle; Figure 23 This is an assembly drawing of the back plate, bottom plate, and nozzle fixing plate in the embodiments of this application; Figure 24 This is an exploded view of the base plate and the nozzle fixing plate in the embodiments of this application.

[0027] In the picture: 100. Housing; 110. Back panel; 111. Plug-in interface; 112. Second snap-fit ​​part; 120. Top plate; 130. Side plate; 140. Bottom plate; 141. First water inlet; 142. Second water inlet; 143. First refrigerant inlet; 144. Second refrigerant inlet; 145. Second sub-positioning part; 146. Drainage part; 147. Wiring port; 150. Cover plate; 160. Pipe fixing plate; 161. Positioning plate; 1611. 162. Positioning part; 162. Connecting plate; 1621. Pipe fixing part; 163. U-shaped clamp; 164. R-shaped clamp; 101. Receiving cavity; 102. Reserved space; 103. Installation space; 200. Electrical box; 210. Box back plate; 221. Lower side plate; 300. Heat exchanger; 400. Heat exchanger mounting bracket; 410. First mounting plate; 411. Limiting plate; 412. Extension plate; 420. Second mounting plate; 421. Plug-in part; 422. Folded edge; 430. Third mounting plate; 440. Fourth mounting plate; 450. Third support part; 500. Electrical box bracket; 510. Support plate; 511. First support part; 512. Second support part; 513. Hollowed-out part; 610. Positioning protrusion; 620. Positioning hole; 711. First water pipe; 712. Second water pipe; 713. Third water pipe; 721. First refrigerant pipe; 72 2. Second refrigerant pipe; 730. T-type tee; 740. Air vent valve; 750. Safety valve; 760. Flow switch; 810. Expansion tank; 820. Mounting plate; 821. Extension plate; 822. Assembly plate; 823. First snap-fit ​​part; 900. Expansion tank mounting bracket; 910. Fixing plate; 911. Positioning part; 920. Extension part; 930. Hook; 931. Connecting section; 932. Bending section; 940. Assembly part. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] In the description of this application, it should be understood that the terms "center", "lateral", "vertical", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, the “width direction” of the housing refers to the left-right direction of the housing in the installed state, the “height direction” of the housing refers to the up-down direction of the housing in the installed state, and the “thickness direction” of the housing refers to the front-back direction of the housing in the installed state; the width direction, thickness direction and height direction are orthogonal to each other.

[0032] The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The term "multiple" in this application refers to two or more.

[0034] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0035] A first aspect of this application provides an indoor unit for a heat pump unit. For example... Figures 1-5 As shown, the indoor unit of the heat pump unit includes a housing 100. The housing 100 constitutes the overall appearance of the indoor unit of the heat pump unit.

[0036] A receiving cavity 101 is defined inside the housing 100, and various components for realizing the functions of the indoor unit are installed in the receiving cavity 101.

[0037] The housing 100 includes a back plate 110, which encloses the rear side of the receiving cavity 101.

[0038] In some embodiments, the indoor unit of the heat pump unit is wall-mounted. A hoisting component is provided on the side of the back panel 110 away from the receiving cavity 101. The hoisting component is used to install the indoor unit on the mounting surface, thereby realizing the hoisting of the indoor unit of the heat pump unit.

[0039] like Figures 1-5 As shown, the housing 100 also includes a top plate 120, a side plate 130, and a bottom plate 140, which are used to close the top, sides, and bottom of the receiving cavity 101, respectively. The top plate 120, side plate 130, and bottom plate 140 define an opening on the opposite side of the back plate 110.

[0040] The housing 100 also includes a cover plate 150, which is detachably mounted on the opening portion for opening or closing the receiving cavity 101. When maintenance or replacement of the components within the receiving cavity 101 is required, the cover plate 150 can be removed to operate on the corresponding components.

[0041] like Figures 4-9 As shown, an electrical box 200 is installed inside the receiving cavity 101. The electrical box 200 is connected to the back panel 110 and located at the upper part of the receiving cavity 101. The electrical box 200 is used to install and protect the electrical components of the indoor unit to realize the corresponding control functions. Electrical components such as the main control board, relays, fuses, and terminal blocks are installed inside the electrical box 200.

[0042] In some embodiments, such as Figures 10-16 As shown, the electrical box 200 includes a box back plate 210 facing the back plate 110. The edge of the box back plate 210 extends away from the back plate 110 to form a box side plate. An electrical receiving cavity is defined between the box back plate 210 and the box side plate.

[0043] An electrical box opening is defined on the side of the box body away from the back plate 210, and an electrical box cover is provided at the electrical box opening to close the electrical appliance receiving cavity.

[0044] like Figures 4-7 As shown, a heat exchanger 300 is also installed inside the housing 101, located below the electrical box 200. The heat exchanger 300 is positioned along the height of the housing 100. Specifically, the heat exchanger 300 is a water-refrigerant heat exchanger, which has water and refrigerant channels to facilitate heat exchange between the water and the refrigerant.

[0045] In some embodiments, to improve the heat exchange effect, the water circuit and refrigerant channel are arranged in an up-down flow direction along the height of the casing 100, so that the heat exchange medium can fully contact and flow in the vertical direction, thereby improving the heat transfer efficiency and further improving the overall energy efficiency of the indoor unit.

[0046] In some embodiments, the indoor unit of the heat pump unit also includes a heat exchanger mounting bracket 400. The heat exchanger mounting bracket 400 is connected to the heat exchanger 300 to securely mount the heat exchanger 300 onto the back panel 110.

[0047] The heat exchanger mounting bracket 400 is installed along the height of the casing 100. For example... Figures 4-16 As shown, the top of the heat exchanger mounting bracket 400 is connected to the bottom of the electrical box 200, and the heat exchanger mounting bracket 400 is connected to the back plate 110 so that the heat exchanger mounting bracket 400, the electrical box 200 and the back plate 110 are connected to form a whole.

[0048] In the above embodiments, the heat exchanger mounting bracket 400 not only supports and fixes the heat exchanger 300, but its top is also connected to the electrical box 200. While ensuring the stable installation of the heat exchanger 300, it also provides support and fixation for the electrical box 200. Since the heat exchanger mounting bracket 400, the electrical box 200, and the back panel 110 are interconnected to form a single integrated structure, while ensuring the functionality of each component, the indoor unit as a whole forms a robust connecting frame, thereby effectively improving the structural strength and reliability of the indoor unit.

[0049] In some embodiments, such as Figures 6-16As shown, the indoor unit of the heat pump unit also includes an electrical box bracket 500. One end of the electrical box bracket 500 is connected to the box back plate 210, and the other end of the electrical box bracket 500 is connected to the back plate 110. The box back plate 210, the back plate 110 and the electrical box bracket 500 form a reserved space 102.

[0050] In the above embodiment, by installing an electrical box bracket 500 between the back plate 210 of the electrical box 200 and the back plate 110 of the housing 100, the electrical box 200 is separated from the back plate 110, thereby making the electrical box 200 closer to the opening of the housing 100, which facilitates wiring or maintenance of the electrical box 200. At the same time, a reserved space 102 is formed between the back plate 210, the back plate 110 and the electrical box bracket 500, which can be used to install other components, such as water pumps, so that the space in the thickness direction of the housing 100 is fully utilized, improving the utilization rate of the internal space of the unit.

[0051] In some embodiments, such as Figure 6 and Figure 18 As shown, the appliance box bracket 500 includes two support plates 510, which are connected to each other and set at an angle, thereby pushing the appliance box 200 towards the front opening of the housing 100. By designing the support plates 510 that extend in the thickness direction of the housing 100, the space occupied between the back plate 210 and the back plate 110 of the box can be reduced, the volume of the reserved space 102 can be increased, and the space utilization rate can be further improved.

[0052] In some embodiments, such as Figures 10-12 , Figure 14 and Figure 18 As shown, each support plate 510 is bent at the edge near the back plate 210 of the box to form a first support part 511, which is attached to and fixedly connected to the back plate 210. Each support plate 510 is provided with a second support part 512 near the edge of the back plate 110, which is attached to and fixedly connected to the back plate 110.

[0053] In the above embodiment, the two ends of the electrical box bracket 500 form surface contact with the box back plate 210 and back plate 110 at the assembly position through the first support portion 511 and the second support portion 512, respectively, thereby improving the reliability of the assembly and the stability of the support for the electrical box 200. Optionally, the first support portion 511 and the second support portion 512 are fastened to the box back plate 210 and back plate 110, respectively, by screws.

[0054] In some embodiments, such as Figure 18As shown, the first support part 511 and the second assembly part 512 bend in opposite directions and provide support from both sides of the support plate 510, further improving the support stability of the electrical box bracket 500.

[0055] In some embodiments, such as Figure 18 As shown, a positioning hole 620 is formed through the first support part 511 and the second support part 512. Correspondingly, a positioning protrusion 610 is provided on the back plate 210 and the back plate 110 of the box body. The positioning protrusion 610 cooperates with the positioning hole 620 and can play a positioning role during the assembly process, thereby improving the positioning accuracy of the electrical box bracket 500 and facilitating the assembly operation.

[0056] In some embodiments, the two support plates 510 are provided with a through-hole 513. The through-hole 513 is formed in the middle region of the support plate 510. The through-hole 513 can reduce the overall weight of the electrical box bracket 500, improve the reliability of the assembly connection, and at the same time, it can also improve the air circulation in the receiving cavity 101 to a certain extent, which is beneficial to the heat dissipation of the electrical box 200.

[0057] In some embodiments, two electrical box brackets 500 are provided, and the two electrical box brackets 500 are respectively installed on both sides of the back plate 210 of the box body in the width direction of the housing 100.

[0058] In each appliance box bracket 500, the edge of one support plate 510 near the back plate 210 of the box body is aligned with the upper edge of the back plate 210 of the box body, and the edge of the other support plate 510 near the back plate 210 of the box body is aligned with the side edge of the back plate 210 of the box body in the width direction of the housing 100.

[0059] In the above embodiment, two appliance box brackets 500 support the appliance box 200 on both sides of the back plate 210, respectively, so that the appliance box 200 can be stably supported in the width direction, improving the stability of the appliance box 200. The edges of the two support plates 510 in each appliance box bracket 500 are aligned with the upper edge and side edge of the back plate 210, respectively, forming a continuous reserved space 102 between the back plate 210 and the back plate 110, maximizing the volume of the reserved space 102, improving the accommodation capacity of the reserved space 102, and making full use of the internal space of the indoor unit.

[0060] In some embodiments, such as Figure 8 , Figures 10-17 As shown, the side panel of the electrical box 200 includes a lower side panel 221 near the heat exchanger mounting bracket 400. The heat exchanger mounting bracket 400 includes a first mounting plate 410 near the electrical box 200, the first mounting plate 410 extending along the thickness direction of the housing 100 and opposite to the lower side panel 221.

[0061] Because the electrical box bracket 500 pushes the electrical box 200 towards the front of the housing 100, the electrical box 200 is positioned close to the front of the housing 100 relative to the heat exchanger mounting bracket 400. The front surface of the first mounting plate 410 away from the back plate 110 abuts against the rear surface of the lower side plate 221 near the back plate 110, so that the heat exchanger mounting bracket 400 provides reliable support for the electrical box 200.

[0062] In some embodiments, such as Figures 11-12 as well as Figures 14-16 As shown, a limiting plate 411 is provided on the first mounting plate 410. The limiting plate 411 is located on the rear side of the box back plate 210 and is abutted against the box back plate 210. An extension plate 412 is provided on the edge (i.e., the front edge) of the first mounting plate 410 away from the back plate 110. The extension plate 412 is abutted against and fixedly connected to the lower side plate 221.

[0063] In the above embodiment, the limiting plate 411 limits the electrical box 200 on the rear side of the box back plate 210, preventing the lower side plate 221 of the electrical box 200 from sliding backward relative to the first mounting plate 410. With the fixed connection between the extension plate 412 on the front side of the first mounting plate 410 and the lower side plate 221, the overall position of the electrical box 200 is fixed, which can effectively limit the lateral and vertical displacement of the electrical box 200, making the installation of the electrical box 200 more stable and improving the reliability of the connection.

[0064] In some embodiments, the heat exchanger mounting bracket 400 further includes a second mounting plate 420, which extends from one edge of the first mounting plate 410 along the thickness direction of the housing 100 toward a side away from the electrical box 200. The side of the heat exchanger 300 facing the second mounting plate 420 is fixedly connected to the second mounting plate 420, thereby mounting the heat exchanger 300 onto the heat exchanger mounting bracket 400.

[0065] like Figures 11-16 As shown, the second mounting plate 420 has multiple insertion portions 421 along its edge near the back plate 110. The back plate 110 has multiple insertion interfaces 111 corresponding to the insertion portions 421. The insertion portions 421 are inserted into the corresponding insertion interfaces 111 to restrict the movement of the heat exchanger mounting bracket 400. Through the cooperation of the insertion portions 421 and the insertion interfaces 111, the installation position of the heat exchanger mounting bracket 400 on the back plate 110 can be initially positioned, thereby simplifying assembly operations, improving installation efficiency, and helping to ensure the installation accuracy and overall structural stability of the heat exchanger mounting bracket 400.

[0066] In some embodiments, such as Figure 11As shown, multiple sets of plug-in interfaces 111 are provided through the back plate 110. The multiple sets of plug-in interfaces 111 are spaced apart along the width direction of the housing 100 to change the installation position of the heat exchanger mounting bracket 400 on the back plate 110, thereby adapting to the installation of heat exchangers 300 of different sizes or layouts, realizing flexible adjustment of the installation position, and facilitating the expansion of the product's applications.

[0067] Optionally, the insertion interface 111 is located near the side of the housing 100 in the width direction, so that the heat exchanger mounting bracket 400 and the heat exchanger 300 are located near the side of the receiving cavity 101, thereby optimizing the layout of the components inside the receiving cavity 101.

[0068] In some embodiments, two plug-in portions 421 are provided, respectively located near the top and bottom of the second mounting plate 420. Correspondingly, two plug-in interfaces 111 are provided on the back plate 110 corresponding to the plug-in portions 421, so as to achieve stable positioning of the heat exchanger mounting bracket 400 on the back plate 110.

[0069] In some embodiments, such as Figure 14 As shown, the second mounting plate 420 has a folded edge 422 on one side near the back plate 110. The folded edge 422 is close to the back plate 110 to support the second mounting plate 420 and further enhance the structural stability of the heat exchanger mounting bracket 400.

[0070] In some embodiments, the heat exchanger mounting bracket 400 further includes a third mounting plate 430 and a fourth mounting plate 440.

[0071] like Figure 15 As shown, the third mounting plate 430 is located on the side of the second mounting plate 420 away from the first mounting plate 410 and is opposite to the first mounting plate 410; the fourth mounting plate 440 connects the side of the first mounting plate 410 away from the back plate 110 and the side of the third mounting plate 430 away from the back plate 110.

[0072] The first mounting plate 410 and the third mounting plate 430 are bent near the edge of the back plate 110 to form a third support part 450, which is attached to and fixedly connected to the back plate 110.

[0073] Optionally, the third support portion 450 on the first mounting plate 410 extends upward along the height direction of the housing 100, and the third support portion 450 on the third mounting plate 430 extends downward along the height direction of the housing 100, so that the two third support portions 450 are exposed, which facilitates the assembly operation and improves the support effect on the heat exchanger mounting bracket 400 on both sides.

[0074] A heat exchanger housing cavity is defined between the first mounting plate 410, the second mounting plate 420, the third mounting plate 430, and the fourth mounting plate 440, and the heat exchanger 300 is installed in the heat exchanger housing cavity. The heat exchanger mounting bracket 400 surrounds the heat exchanger 300 at a 270° angle, achieving the function of fixing and protecting the heat exchanger 300; at the same time, the heat exchanger mounting bracket 400 with the above structure increases the overall rigidity of the internal frame structure, improves the structural strength of the unit, and enhances the assembly reliability.

[0075] The heat exchanger 300 is exposed via the open side of the heat exchanger mounting bracket 400, that is, the side opposite to the second mounting plate 420, so as to facilitate the connection of the heat exchanger 300 to the piping system.

[0076] In some embodiments, the heat exchanger mounting bracket 400 is disposed on the side near the width direction of the housing 100, and the receiving cavity 101 includes a mounting space 103 located below the electrical box 200 and on the opposite side of the heat exchanger 300. The open side of the heat exchanger mounting bracket 400 is opposite to the mounting space 103, facilitating the connection of the heat exchanger 300 to the piping system.

[0077] like Figure 5 As shown, a first water inlet 141 and a second water inlet 142 are provided on the base plate 140. Optionally, the first water inlet 141 is a water outlet and the second water inlet 142 is a water inlet.

[0078] The heat exchanger 300 includes a first water circuit interface and a second water circuit interface.

[0079] like Figure 5 As shown, the first water interface is close to the top of the heat exchanger 300 and is connected to the first water pipe 711. The first water pipe 711 extends along the top of the installation space 103 toward the opposite side of the heat exchanger 300. The end of the first water pipe 711 away from the heat exchanger 300 is connected to the second water pipe 712. The second water pipe 712 extends along the side of the installation space 103 away from the heat exchanger 300 and is connected to the first water inlet 141.

[0080] The second water inlet is located near the bottom of the heat exchanger 300 and is connected to the third water pipe 713. The third water pipe 713 extends along the bottom of the installation space 103 to the opposite side of the heat exchanger 300 and is connected to the second water inlet 142.

[0081] An avoidance zone is formed between the first water pipe 711, the second water pipe 712 and the third water pipe 713, and an expansion tank 810 is installed in the avoidance zone.

[0082] In the above embodiment, the overall layout of the system has been optimized. The heat exchanger 300 is positioned on the side close to the receiving cavity 101, which maximizes the installation space 103 located below the electrical box 200 and on the opposite side of the heat exchanger 300. The water system pipeline connecting the heat exchanger 300 is located on the opposite side of the heat exchanger 300, which can make full use of the dimensions in the width direction of the unit to meet the requirements such as the bending length of the pipeline.

[0083] In addition, the expansion tank 810 is a key component of the heat pump system and requires frequent inspection and maintenance. By laying the water pipes along the edge of the installation space 103, a clearance space is formed in the area near the center of the installation space 103. The expansion tank 810 is installed in the clearance space, so that there are no other components obstructing the opening between the expansion tank 810 and the front of the casing 100. During the daily maintenance and inspection of the expansion tank 810, there is no need to disassemble other components, making debugging and maintenance more convenient.

[0084] By employing the above methods, the components are rationally arranged inside the unit and make full use of the unit's width, height, and thickness dimensions, resulting in a more compact and rational system layout. This effectively reduces the overall size of the indoor unit, making it easy to install in closets or small spaces, thus meeting the usage requirements in compact installation environments.

[0085] In this embodiment, the expansion tank 810 has a circular structure, which can be installed in the clearance space between pipelines.

[0086] In some embodiments, such as Figure 5 , Figure 7 and Figure 9 As shown, the first water pipe 711 and the second water pipe 712 are connected by a T-shaped tee 730, and an air vent valve 740 is installed at the top valve port of the T-shaped tee 730. The connection between the first water pipe 711 and the second water pipe 712 forms the highest point of the water system, and the air vent valve 740 is arranged at the highest point to meet the safety requirements of the air vent valve 740.

[0087] In some embodiments, a safety valve 750 is installed on the second water pipe 712 to ensure the safe and stable operation of the water system.

[0088] In some embodiments, a flow switch 760 is installed on the first water pipe 711 or the second water pipe 712. During unit operation, it is necessary to identify the system's water flow limit. The flow switch 760 serves as a safety threshold alarm. The flow switch 760 is installed perpendicular to the first water pipe 711 or the second water pipe 712 to meet the requirement of being perpendicular to the water flow direction.

[0089] In some embodiments, such as Figure 5As shown, a first refrigerant port 143 and a second refrigerant port 144 are also provided on the base plate 140. The first refrigerant port 143 and the second refrigerant port 144 are closer to the heat exchanger 300 than the first water inlet 141 and the second water inlet 142.

[0090] The heat exchanger 300 also includes a first refrigerant interface and a second refrigerant interface. A first refrigerant pipe 721 is connected between the first refrigerant interface and the first refrigerant port 143, and a second refrigerant pipe 722 is connected between the second refrigerant interface and the second refrigerant port 144. The first refrigerant pipe 721 and the second refrigerant pipe 722 are arranged between the expansion tank 810 and the heat exchanger 300.

[0091] In the above embodiment, the refrigerant pipeline is laid close to the heat exchanger 300, which effectively reduces the length of the refrigerant pipeline. At the same time, it avoids the expansion tank 810, which can make full use of the internal size of the unit, realize the compact layout of the internal structure, and improve the overall energy efficiency and operational reliability of the system.

[0092] In some embodiments, such as Figure 19 and Figure 20 As shown, the expansion tank 810 is mounted on the back plate 110 via the expansion tank mounting bracket 900.

[0093] like Figure 21 As shown, the expansion tank mounting bracket 900 includes a fixing plate 910, which is disposed opposite to the back plate 110. A positioning part 911 is provided on the fixing plate 910, and the positioning part 911 is disposed toward the expansion tank 810.

[0094] An expansion tank 810 is provided with a hanging plate 820 on the side near the fixing plate 910. The hanging plate 820 includes an extension plate 821 extending from the expansion tank 810 to the fixing plate 910 and an assembly plate 822 located on the edge of the extension plate 821. The assembly plate 822 is attached to and fixedly connected to the fixing plate 910.

[0095] A first snap-fit ​​part 823 is provided through the connection between the expansion plate 821 and the assembly plate 822, and a positioning part 911 is inserted into the first snap-fit ​​part 823 to realize the positioning and installation of the expansion tank 810.

[0096] The mounting plate 822 and the fixing plate 910 are also fastened together by fasteners. Optionally, the fasteners are screws.

[0097] In some embodiments, such as Figure 20 As shown, a second snap-fit ​​portion 112 is provided through the back plate 110.

[0098] like Figure 21 and Figure 22As shown, the fixing plate 910 and the back plate 110 are spaced apart. Extensions 920 extending to the back plate 110 are formed on both sides of the fixing plate 910. Hooks 930 are provided on the extensions 920. The hooks 930 include a connecting section 931 connected to the extensions 920 and a bent section 932 connected to the connecting section 931. The connecting section 931 passes through the second snap-fit ​​part 112. The bent section 932 and the extensions 920 are located on both sides of the back plate 110, so as to restrict the hooks 930 from coming out of the second snap-fit ​​part 112 and position the expansion tank mounting bracket 900 on the back plate 110.

[0099] In some embodiments, the hook 930 is disposed near the lower part of the extension 920, and the mounting part 940 is disposed on the upper part of the extension 920. The mounting part 940 is abutted against and securely connected to the back plate 110.

[0100] During the installation of the expansion tank, the expansion tank is first installed on the expansion tank mounting bracket. The positioning part on the fixing plate is used to position the expansion tank to be installed, and then nails are driven in to secure it. Subsequently, the expansion tank mounting bracket is initially positioned on the back plate by using the hooks on the expansion tank mounting bracket and the second snap-fit ​​part on the back plate, and then the connection is tightened, making the disassembly and installation of the expansion tank more convenient.

[0101] The expansion valve is equipped with an air inlet valve, which can be connected to a pressure gauge to detect whether the system pressure is normal. When the pressure is abnormal, an air inlet / outlet operation can be performed. In some embodiments, the water inlet of the expansion valve is set upwards and the air inlet valve is set downwards, which not only ensures the reliable operation of the water system, but also minimizes the risk of potential leaks in the expansion tank 810, while facilitating the daily inspection and maintenance of the unit.

[0102] In some embodiments, such as Figure 23 and Figure 24 As shown, the housing 100 also includes a port fixing plate 160. The port fixing plate 160 includes a positioning plate 161 located at the bottom of the receiving cavity 101. The positioning plate 161 is disposed near the back plate 110. The positioning plate 161 is connected to the bottom plate 140 and together seals the bottom of the receiving cavity 101.

[0103] A plurality of first sub-positioning parts 1611 are provided through the positioning plate 161, and the plurality of first sub-positioning parts 1611 are close to the front side of the positioning plate 161 and extend to the front edge of the positioning plate 161; a plurality of second sub-positioning parts 145 are provided through the base plate 140, and the plurality of second sub-positioning parts 145 are close to the rear side of the base plate 140 and extend to the rear edge of the base plate 140. The plurality of first sub-positioning parts 1611 and the plurality of second sub-positioning parts 145 are connected one by one to form a plurality of pipe opening positioning parts.

[0104] The second water pipe 712, the third water pipe 713, the first refrigerant pipe 721, and the second refrigerant pipe 722 pass through the pipe opening positioning part and are connected to the first water inlet 141, the second water inlet 142, the first refrigerant inlet 143, and the second refrigerant inlet 144, respectively.

[0105] In some embodiments, the nozzle fixing plate 160 further includes a connecting plate 162, which is connected to the rear edge of the positioning plate 161 and fixedly connected to the back plate 110.

[0106] A portion of the connecting plate 162 protrudes from the front side of the housing 100 to form a pipe fixing part 1621, located on the front side near the rear side of the pipe outlet positioning part. A U-shaped clamp 163 for fixing the second water pipe 712 and the third water pipe 713 is installed on the front side of the pipe fixing part 1621. The second water pipe 712 and the third water pipe 713 pass through the U-shaped clamp 163 and extend into the first water outlet 141 and the second water outlet 142, respectively. An R-shaped clamp 164 for fixing the first refrigerant pipe 721 and the second refrigerant pipe 722 is also installed on the front side of the pipe fixing part 1621. The first refrigerant pipe 721 and the second refrigerant pipe 722 pass through the R-shaped clamp 164 and extend into the first refrigerant outlet 143 and the second refrigerant outlet 144, respectively.

[0107] The U-shaped clamp 163 has a U-shaped cross-section and connects to the pipe fixing part 1621 on both sides. The U-shaped clamp 163 and the pipe fixing part 1621 work together to fix the second water pipe 712 or the third water pipe 713. The R-shaped clamp 164 has an annular cross-section, and the ends of the R-shaped clamp 164 are connected to form a closed structure for fixing the first refrigerant pipe 721 or the second refrigerant pipe 722.

[0108] U-shaped clamps 163 and R-shaped clamps 164 are used to fix the water pipes and refrigerant pipes respectively, and the positions are as close as possible to the pipe fixing part 1621 at the pipe opening to ensure the firm positioning and installation of each pipe, which facilitates the operation and safety of off-site installation.

[0109] In some embodiments, a drain portion 146 for draining water outward is provided on the base plate 140. The positioning plate 161 is inclined at a lower height from the back plate 110 toward the base plate 140 so as to guide water falling on the positioning plate 161 to the base plate 140, thereby draining the water collected at the bottom of the receiving cavity 101 outward through the drain portion 146.

[0110] In some embodiments, a seal is filled in the gap between the pipe (water pipe and refrigerant pipe) and the pipe opening positioning part to prevent water that has accumulated at the bottom of the receiving cavity 101 from dripping out through the gap of the pipe opening positioning part.

[0111] In some embodiments, such as Figure 7As shown, the base plate 140 is also provided with a plurality of cable passage openings 147 for cables to pass through. The plurality of cable passage openings 147 are located on the side of the first refrigerant port 143 and the second refrigerant port 144 away from the first water port 141 and the second water port 142, so as to separate the cable passage openings 147 from the first water port 141 and the second water port 142 and reduce the impact of water pipe leakage on the cables at the cable passage openings 147.

[0112] A second aspect of this application also provides a heat pump unit indoor unit, which includes a housing 100.

[0113] A receiving cavity 101 is defined inside the housing 100. The housing 100 includes a back plate 110 that closes the rear side of the receiving cavity 101. The back plate 110 includes a first mounting area and a second mounting area that are arranged side by side in the height direction of the housing 100.

[0114] An electrical box 200 is provided inside the receiving cavity 101, and the electrical box 200 is connected to the first installation area.

[0115] A heat exchanger mounting bracket 400 is provided in the receiving cavity 101, which is used to install the heat exchanger 300.

[0116] The heat exchanger mounting bracket 400 is arranged along the height direction of the casing 100 and connected to the second mounting area. The heat exchanger mounting bracket 400 is adjacent to and connected to the electrical box 200, so that the first mounting area, the electrical box 200, the heat exchanger mounting bracket 400 and the second mounting area are sequentially connected to form a whole.

[0117] The indoor unit of the heat pump unit provided in the second aspect of this application may overlap with the indoor unit of the heat pump unit provided in the first aspect, but this should not be construed as limiting each other by mutual exclusion.

[0118] Other structures of the indoor unit of the heat pump unit provided in the second aspect above can be referred to the embodiments in the first aspect, and will not be repeated here.

[0119] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0120] The above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. An indoor unit of a heat pump unit, characterized in that, include: A housing, having a receiving cavity defined inside the housing, the housing including a back plate that closes the rear side of the receiving cavity; An electrical box is connected to the back plate and located at the top of the receiving cavity; A heat exchanger is disposed within the receiving cavity and located below the electrical box; A heat exchanger mounting bracket is connected to the heat exchanger. The heat exchanger mounting bracket is arranged along the height direction of the housing. The top of the heat exchanger mounting bracket is connected to the bottom of the electrical box, and the heat exchanger mounting bracket is connected to the back plate, so that the heat exchanger mounting bracket, the electrical box, and the back plate are connected to form a whole.

2. The indoor unit of the heat pump unit according to claim 1, characterized in that, The electrical box includes a box back panel facing the back panel; The indoor unit of the heat pump unit also includes an electrical box bracket. One end of the electrical box bracket is connected to the back panel of the box body, and the other end of the electrical box bracket is connected to the back panel. The box body back panel, the back panel and the electrical box bracket form a reserved space.

3. The indoor unit of the heat pump unit according to claim 2, characterized in that, The appliance box bracket includes two support plates, which are connected to each other and set at an angle. Each support plate is bent near the edge of the box back plate to form a first support part, which is attached to and fixedly connected to the box back plate. Each support plate is provided with a second support part near the edge of the back plate, which is attached to and fixedly connected to the back plate.

4. The indoor unit of the heat pump unit according to claim 3, characterized in that, The electrical box bracket is provided in two parts, and the two electrical box brackets are respectively installed on both sides of the back plate of the box body in the width direction of the casing; In each of the appliance box brackets, the edge of one support plate near the back panel of the box body is aligned with the upper edge of the back panel of the box body, and the edge of the other support plate near the back panel of the box body is aligned with the side edge of the back panel of the box body in the width direction of the housing.

5. The indoor unit of the heat pump unit according to claim 2, characterized in that, The electrical box also includes a box side plate extending from the edge of the box back plate in a direction away from the back plate, and the box side plate includes a lower side plate close to the heat exchanger mounting bracket; The heat exchanger mounting bracket includes a first mounting plate near the electrical box. The first mounting plate extends along the thickness direction of the housing and is opposite to the lower side plate. The front surface of the first mounting plate away from the back plate is in contact with the rear surface of the lower side plate near the back plate. A limiting plate is provided on the first mounting plate. The limiting plate is located on the rear side of the box back plate and is abutted against the box back plate. An extension plate is provided on the edge of the first mounting plate away from the back plate. The extension plate is abutted against and fixedly connected to the lower side plate.

6. The indoor unit of the heat pump unit according to claim 5, characterized in that, The heat exchanger mounting bracket also includes a second mounting plate. The second mounting plate extends from one side edge of the first mounting plate along the thickness direction of the housing towards the side away from the electrical box. The side edge of the second mounting plate near the back plate is provided with multiple insertion parts. The back plate is provided with multiple insertion interfaces corresponding to the insertion parts. The insertion parts are inserted into the corresponding insertion interfaces to restrict the movement of the heat exchanger mounting bracket.

7. The indoor unit of the heat pump unit according to claim 1, characterized in that, The housing also includes a bottom plate, which is connected to the back plate and closes the bottom of the receiving cavity. A first water inlet and a second water inlet are provided on the bottom plate. The heat exchanger mounting bracket is disposed on the side close to the width direction of the housing, and the receiving cavity includes an installation space located below the electrical box and on the opposite side of the heat exchanger; The heat exchanger includes a first water inlet and a second water inlet; The first water inlet is located near the top of the heat exchanger and is connected to a first water pipe. The first water pipe extends along the top of the installation space toward the opposite side of the heat exchanger. The end of the first water pipe away from the heat exchanger is connected to a second water pipe. The second water pipe extends along the side of the installation space away from the heat exchanger and is connected to the first water inlet. The second water inlet is located near the bottom of the heat exchanger and is connected to a third water pipe. The third water pipe extends along the bottom of the installation space toward the opposite side of the heat exchanger and connects to the second water inlet. An avoidance zone is formed between the first water pipe, the second water pipe and the third water pipe, and an expansion tank is installed in the avoidance zone.

8. The indoor unit of the heat pump unit according to claim 7, characterized in that, The base plate is also provided with a first refrigerant port and a second refrigerant port, which are close to the heat exchanger relative to the first water inlet and the second water inlet; The heat exchanger also includes a first refrigerant inlet and a second refrigerant inlet. A first refrigerant pipe is connected between the first refrigerant inlet and the first refrigerant port, and a second refrigerant pipe is connected between the second refrigerant inlet and the second refrigerant port. The first refrigerant pipe and the second refrigerant pipe are arranged between the expansion tank and the heat exchanger.

9. The indoor unit of the heat pump unit according to claim 7, characterized in that, The expansion tank is mounted on the back plate via an expansion tank mounting bracket. The expansion tank mounting bracket includes a fixing plate, which is disposed opposite to the back plate. A positioning part is provided on the fixing plate, and the positioning part is disposed towards the expansion tank. The expansion tank is provided with a hanging plate on the side near the fixed plate. The hanging plate includes an extension plate extending from the expansion tank to the fixed plate and an assembly plate located at the edge of the extension plate. The assembly plate is abutted against and fixedly connected to the fixed plate. A first snap-fit ​​part is provided through the connection between the extension plate and the assembly plate. The positioning part is inserted into the first snap-fit ​​part. A second snap-fit ​​portion is provided through the back plate; The fixing plate and the back plate are spaced apart. An extension portion extending to the back plate is formed on both sides of the fixing plate. A hook is provided on the extension portion. The hook includes a connecting section connected to the extension portion and a bent section connected to the connecting section. The connecting section passes through the second snap-fit ​​portion. The bent section and the extension portion are respectively located on both sides of the back plate.

10. An indoor unit of a heat pump unit, characterized in that, include: A housing, having a receiving cavity defined inside the housing, the housing including a back plate that closes the rear side of the receiving cavity, the back plate including a first mounting area and a second mounting area arranged side by side in the height direction of the housing; An electrical box is located within the receiving cavity and connected to the first mounting area; A heat exchanger mounting bracket is used to install a heat exchanger. The heat exchanger mounting bracket is arranged along the height direction of the housing and connected to the second mounting area. The heat exchanger mounting bracket is adjacent to and connected to the electrical box, so that the first mounting area, the electrical box, the heat exchanger mounting bracket and the second mounting area are sequentially connected to form a whole.

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