Heating client hydraulic device and heating and ventilation equipment

Abstract

The invention discloses a heating client hydraulic device and heating and ventilation equipment, and relates to the technical field of heating and ventilation. Comprising a machine body, a buffer water tank, an expansion compensation unit, a heating distribution unit, a constant-pressure water supplementing unit and a control unit, the expansion compensation unit is connected with the buffer water tank; the heating distribution unit is used for being connected with the buffer water tank, a heat pump device outside the machine body and a user heating tail end. The constant-pressure water replenishing unit is used for connecting the heating distribution unit and a tap water pipeline outside the machine body; the control unit is electrically connected with the expansion compensation unit, the heating distribution unit and the constant-pressure water supplementing unit. Water storage, expansion compensation, constant-pressure water supplement and control of a heating client are integrated, the space occupied by each pipeline is reduced, the workload of on-site manual installation is reduced, and therefore the construction efficiency and quality of the heating client device are improved, and the operation stability and reliability of each unit are improved.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation and air conditioning (HVAC) technology, and more particularly to a hydraulic device for heating households and HVAC equipment. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Heating systems in HVAC systems provide heating and hot water services to users through centralized heat sources. As demands evolve, clients often require the integration of various devices such as zone control, buffer storage units, gas boilers, and solar energy systems.

[0004] However, this diverse configuration results in a complex water system structure, requiring the use of numerous pipes and fittings for connection during installation, leading to a cluttered layout and large space occupation. The installation process thus becomes cumbersome, time-consuming, and highly dependent on worker experience, making it difficult to consistently guarantee construction efficiency and quality. Summary of the Invention

[0005] The purpose of this invention is to at least solve the problems of inconvenient installation and complex structure of existing heating systems. This purpose is achieved through the following technical solution: This invention proposes a hydraulic device for a heating household, comprising a body, an expansion compensation unit, a heating distribution unit, a constant pressure water supply unit, and a control unit. The expansion compensation unit is installed on the body and connected to a buffer tank outside the body; the expansion compensation unit is configured to absorb the increased water volume after the buffer tank expands due to heat. The heating distribution unit connects the buffer tank, a heat pump device, and the user's heating terminal outside the body, distributing hot water from the buffer tank and the heat pump device to the user's heating terminal. The constant pressure water supply unit is installed on the body and connected to a tap water pipeline outside the body; the constant pressure water supply unit supplies tap water to the heating distribution unit. The control unit is installed on the body and electrically connected to the expansion compensation unit, the heating distribution unit, and the constant pressure water supply unit, and is used to open and close these units.

[0006] By adopting the above technical solution, the expansion compensation, constant pressure water supply and control of the heating terminal are integrated into one, which reduces the space occupied by each pipeline and reduces the amount of manual installation work on site, thereby improving the construction efficiency and quality of the heating terminal device, and thus improving the stability and reliability of the operation of each unit.

[0007] In some embodiments of the present invention, the control unit and the heating distribution unit are installed in the upper space of the body, the expansion compensation unit is located in the middle space and / or lower space of the body, and the constant pressure water supply unit is located in the lower space of the body.

[0008] By adopting the above technical solution, the control unit and heating distribution unit are installed on the upper part of the unit, and the expansion compensation unit and constant pressure water supply unit are installed in the middle and lower part of the unit. This makes the device structure more compact and regular, reduces the size of the unit, and makes it easier for staff to debug and maintain the control unit and heating distribution unit located on the upper part. At the same time, the water supply unit at the lower part can also be easily connected to external pipelines.

[0009] In some embodiments of the present invention, the body includes a main frame and a first crossbeam and a second crossbeam mounted from top to bottom on the main frame. An upper space is defined between the first crossbeam and the top of the main frame, a middle space is defined between the second crossbeam and the first crossbeam, and a lower space is defined between the second crossbeam and the bottom of the main frame. The upper space, the middle space, and the lower space are interconnected.

[0010] Using the above technical solution, this structure arranges each unit according to functional logic through a vertical layered design. The control unit is placed at the top for easy operation and moisture protection. The heating distribution unit is located in the middle to facilitate connection with other units and user heating terminals. The expansion and water replenishment units, which are directly related to water, are placed in the lower middle part, which conforms to the pressure principle and improves safety.

[0011] In some embodiments of the present invention, the expansion compensation unit includes a plurality of expansion tanks for connecting the buffer water tank. The plurality of expansion tanks include a first expansion tank, a second expansion tank and a third expansion tank arranged sequentially from top to bottom. Along the height direction of the body, a disassembly and assembly space is reserved above the first expansion tank, above the second expansion tank and above the third expansion tank. The height of the disassembly and assembly space is not less than 60mm.

[0012] Using the above technical solution, multiple expansion tanks are arranged from top to bottom, which can effectively absorb the thermal expansion of the buffer water tank to stabilize the pressure; and the expansion tanks and the space above them are reserved for disassembly and assembly, which facilitates the disassembly and assembly of the expansion tanks and the replenishment of gas.

[0013] In some embodiments of the present invention, the machine body has a base plate, the third expansion tank is disposed above the base plate, and the distance between the third expansion tank and the base plate along the height direction of the machine body is not less than 5mm.

[0014] By adopting the above technical solution, a gap of not less than 5mm is maintained between the third expansion tank and the bottom plate, which can reduce the possibility of water accumulation forming a water film and corroding the third expansion tank, thereby extending the service life of the third expansion tank.

[0015] In some embodiments of the present invention, the control unit includes an electronic control component, the lower end of which is hinged to the body and configured to be flipped to a position outside the body.

[0016] By adopting the above technical solution, the electronic control components are designed to be flip-out, which not only facilitates the operation and maintenance of the control unit, but also facilitates the operation and maintenance of the pipelines inside the control unit, greatly improving the efficiency of operation and maintenance.

[0017] In some embodiments of the present invention, the expansion compensation unit includes an expansion tank connected to the buffer water tank, a limiting structure is provided on the body, the expansion tank is installed on the limiting structure and detachably connected to the body, the limiting structure is used to limit the displacement of the expansion tank in the thickness direction, and one end of the expansion tank along the length direction is detachably connected to the body.

[0018] By adopting the above technical solution, the displacement of the expansion tank in the thickness direction is limited by the limiting structure, and then the expansion tank is detachably connected to the machine body, which can improve the installation stability and ease of disassembly and assembly of the expansion tank.

[0019] In some embodiments of the present invention, when the detachable connection between the expansion tank and the body is released, the limiting structure guides the expansion tank along the length of the expansion tank so that the expansion tank can be pulled out of the body under the guidance of the limiting structure.

[0020] By adopting the above technical solution, the limiting structure and the expansion tank are designed to be guided and matched. After the expansion tank is disconnected from the machine body, it is convenient to pull out the expansion tank in the preset direction for inspection and replacement without removing other parts, which facilitates the maintenance of the expansion tank.

[0021] In some embodiments of the present invention, the heating distribution unit includes a heating outlet pipe and a heating return pipe. The heating outlet pipe is provided with at least one heating outlet for connecting to a user's heating terminal, and the heating return pipe is provided with at least one heating return outlet for connecting to a user's heating terminal.

[0022] The above technical solution, with its independent heating outlet and return water pipes, can adapt to the connection needs of different user terminals.

[0023] In some embodiments of the present invention, the heating distribution unit further includes a first connecting pipe, a first three-way valve, a water storage return path, a water storage outlet path, a heat pump outlet path, and a heat pump return path; one end of the first connecting pipe is connected to the heating outlet pipe, and the other end of the first connecting pipe is connected to the first interface of the first three-way valve; the inlet of the water storage return path is connected to the second interface of the first three-way valve, and the outlet of the water storage return path is used to connect to the user-side water tank outside the unit. The inlet of the heat pump outlet water flow path is used to connect to the heat pump device outside the machine body, and the outlet of the heat pump outlet water flow path is connected to the third interface of the first three-way valve; the inlet of the heat pump return water flow path is connected to the buffer water tank, and the outlet of the heat pump return water flow path is used to connect to the heat pump device; the inlet of the water storage outlet water flow path is connected to the user end water tank, and the outlet of the water storage outlet water flow path is connected in parallel with the water supply pipeline of the constant pressure water supply unit and together connected to the inlet of the heat pump return water flow path.

[0024] By adopting the above technical solution, the first three-way valve enables controllable switching and connection integration between the first connecting pipeline, the water storage return flow path, and the heat pump outlet flow path. It can flexibly switch the heating output object and circulation path. At the same time, the first water storage outlet unit and the constant pressure water supply unit are connected in parallel to the heat pump return end, integrating multiple functions such as heating, heat pump heating, and water storage, thereby improving the system integration and the flexibility of the operation mode.

[0025] In some embodiments of the present invention, a first filter is provided in the heat pump return water flow path.

[0026] By adopting the above technical solution, the first filter can effectively filter impurities in the return water, protect the heat pump device, and extend its service life.

[0027] In some embodiments of the present invention, along the height direction of the body, the first filter is positioned flush with the outlet of the heat pump return water flow path; and / or, the body is provided with a sidewall, and the minimum distance between the first filter and its nearest sidewall is not less than 85mm.

[0028] By adopting the above technical solution, the first filter is at the same height as the main outlet and a side wall gap of not less than 85mm is reserved, which can avoid the problems of water storage and excessive water resistance, and also facilitate the disassembly and cleaning of the filter element.

[0029] In some embodiments of the present invention, the outlet of the water storage return flow path, the inlet of the water storage outlet flow path, and the inlet of the heat pump outlet flow path are located on the same side of the machine body.

[0030] By adopting the above technical solution, the interfaces connecting the external user-end water tank and the heat pump unit are concentrated on the same side of the unit, which simplifies the connection of external pipelines and makes on-site installation faster.

[0031] In some embodiments of the present invention, the constant pressure water supply unit includes a tap water supply path and a tap water return path. The inlet of the tap water supply path is used to connect to a tap water source, the outlet of the tap water supply path is used to connect to the heating distribution unit, the inlet of the tap water return path is connected to the tap water supply path, and the outlet of the tap water return path is used to discharge tap water.

[0032] By adopting the above technical solution, the dual-path design of the constant pressure water supply unit can realize automatic water supply and safe overflow, prevent tap water backflow, and ensure the safety and reliability of the device operation.

[0033] In some embodiments of the present invention, from the inlet to the outlet of the tap water supply flow path, a first safety valve, a check valve, a second filter, and an isolation drain valve are sequentially provided on the tap water supply flow path. The check valve and the isolation drain valve are configured to switch between open and closed states, and the second filter is configured to be detachably connected to the tap water supply flow path.

[0034] By adopting the above technical solution, a first safety valve, a check valve, a second filter, and an isolation drain valve are sequentially installed in the tap water supply flow path, forming a complete function of protection, water supply, filtration, and sewage discharge, which effectively improves the quality of the water supply and the safety of the device.

[0035] In some embodiments of the present invention, a drain valve is provided at the bottom of the second filter.

[0036] By adopting the above technical solution, the drain valve can discharge accumulated water and release pressure when the filter element of the second filter is replaced, reducing the possibility of pollution caused by residual water and improving the convenience of maintenance.

[0037] In some embodiments of the present invention, the second filter has a first connector for connecting the check valve and a second connector for communicating with the isolation valve, the first connector being detachably connected to the check valve and the second connector being detachably connected to the isolation valve.

[0038] The above technical solution makes the disassembly and assembly of the second filter more convenient, and the filter element can be replaced without complicated tools, which facilitates the maintenance and replacement of the second filter.

[0039] In some embodiments of the present invention, both the first connector and the second connector are provided with exhaust valves, or the isolation drain valve is provided with an openable and closable exhaust port.

[0040] By adopting the above technical solution, the exhaust valves of the first and second connectors, or the isolation drain valves with exhaust ports, can effectively discharge the gas in the second filter, avoid air blockage, make the water flow smoother, and improve the filtration efficiency.

[0041] In some embodiments of the present invention, a fourth expansion tank is provided in the tap water return flow path.

[0042] By adopting the above technical solution, the fourth expansion tank can stabilize the pressure of the domestic water system, avoid pressure fluctuations from affecting the water experience, and improve the stability of the domestic water system.

[0043] In some embodiments of the present invention, the body includes a main frame and a first crossbeam and a second crossbeam mounted from top to bottom on the main frame. An upper space is defined between the first crossbeam and the top of the main frame, a middle space is defined between the second crossbeam and the first crossbeam, and a lower space is defined between the second crossbeam and the bottom of the main frame. The upper space, the middle space, and the lower space are interconnected. The fourth expansion tank is located in the lower space and partially below the second crossbeam. The distance between the fourth expansion tank and the second crossbeam along the height direction of the body is not less than 60 mm.

[0044] By adopting the above technical solution, the fourth expansion tank is provided with a top space of not less than 60mm to facilitate gas replenishment operations, while optimizing the spatial layout and improving the compactness of the device.

[0045] In some embodiments of the present invention, the expansion compensation unit includes a compensation pipeline and multiple expansion tanks. One end of the compensation pipeline is connected to a water storage unit, and the other end is connected to multiple expansion tanks respectively. A second safety valve is provided on the compensation pipeline. The second safety valve is provided with a first drain outlet. The body is provided with a base plate. The distance between the first drain outlet and the base plate is not less than 300mm.

[0046] By adopting the above technical solution, the discharge port of the first safety valve is set at a position 300mm higher than the base plate, which can ensure that the discharged water is completely drained, reducing the possibility of safety hazards and equipment corrosion caused by residual water accumulation.

[0047] In some embodiments of the present invention, the check valve is provided with a second drain port, the first safety valve is provided with a third drain port, a main drain port is provided on a side plate of the machine body, the second drain port and the third drain port are both connected to the main drain port by pipelines, and the height of the first drain port on the machine body is greater than the height of the main drain port on the machine body.

[0048] By adopting the above technical solution, this structure connects the discharge ports of multiple safety valves to the same drainage pipe for centralized drainage, which simplifies the structure. Moreover, the height of the first drainage port is higher than that of the main drainage port, which can prevent backflow of drainage and improve the reliability of the overflow function.

[0049] Secondly, the present invention provides a heating, ventilation and air conditioning (HVAC) device, including a heating end hydraulic device as described in any of the above technical solutions. Attached Figure Description

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of the heating household hydraulic device provided for the implementation of the present invention; Figure 2 A schematic diagram of the structure of the heating household hydraulic device after removing the sidewall, provided for the implementation of the present invention; Figure 3 A schematic diagram of a portion of the structure of the heating household hydraulic device provided for the implementation of the present invention, viewed from one perspective. Figure 4 A schematic diagram of a portion of the structure of the heating household hydraulic device provided for the implementation of the present invention from another perspective; Figure 5 A schematic diagram of a portion of the structure of the heating household hydraulic device provided for the implementation of the present invention from another perspective; Figure 6 for Figure 5 Partial structural diagram; Figure 7 A schematic diagram of the flow path of a heating household hydraulic device provided for the implementation of this invention; Figure 8 A schematic diagram showing the connection between the second limiting structure and the second expansion tank of the heating household hydraulic device provided for the implementation of the present invention. Figure 9 A schematic diagram showing the connection between the third limiting structure and the third expansion tank of the heating household hydraulic device provided for the implementation of the present invention; Figure 10 A schematic diagram of the base plate and the third limiting structure of the heating household hydraulic device provided in this invention.

[0051] The attached figures are labeled as follows: 100. Heating household hydraulic device; 10. Body; 11. Main frame; 111. First crossbeam; 112. Second crossbeam; 113. Third crossbeam; 12. Top plate; 13. Bottom plate; 14. Side plate; 15. Support frame; 16. Main drain outlet; 17. Second limiting structure; 171. Second limiting component; 1711. Second support part; 1712. Second limiting part; 18. Third limiting structure; 181. Support component; 182. Third limiting component; 1821. Third limiting part; 1822. Fourth limiting part; 20. Buffer water tank; 30. Expansion compensation unit; 31. First expansion tank; 32. Second expansion tank; 33. Third expansion tank; 34. Compensation pipeline; 341. Second safety valve; 3411. First drain outlet; 40. Heating distribution unit; 41. Heating outlet pipe; 411. First sub-pipe; 4111. Heating outlet; 412. Water pump; 42. Heating return pipe; 421. Second sub-pipe; 4211. Heating return outlet; 43. First connecting pipe; 44. First three-way valve; 45. Storage water return path; 46. Storage water outlet path; 47. Heat pump outlet path; 48. Heat pump return path; 481. First filter; 49. Second three-way valve; 50. Constant pressure water supply unit; 51. Tap water supply path; 511. First safety valve; 512. Check valve; 513. Second filter; 5131. Drain valve; 5132. First connector; 5133. Second connector; 514. Isolation drain valve; 52. Tap water return path; 521. Fourth expansion tank; 60. Control unit; 61. Electrical control components; 62. Distribution box. Detailed Implementation

[0052] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0053] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0054] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0055] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0056] Combined with appendix Figure 1-10As shown, this embodiment provides a heating end hydraulic device 100, which is mainly used in the heating water system of HVAC equipment, specifically a terminal for integrated centralized heating and domestic hot water. The heating end hydraulic device 100 of this embodiment can not only connect to user heating terminals (such as radiators, underfloor heating, or fan coil units), but also connect to the tap water pipes outside the unit 10 and the user's water tank (not shown in the figure).

[0057] The heating household hydraulic device 100 in this embodiment includes functional units such as a body 10, an expansion compensation unit 30, a heating distribution unit 40, a constant pressure water supply unit 50, and a control unit 60.

[0058] The body 10 includes a main frame 11, a top plate 12, a bottom plate 13, and multiple side plates 14. The main frame 11 can be a rectangular or other shaped frame, and a support frame 15 can be installed at the bottom of the main frame 11. The top plate 12 is installed on the top of the main frame 11, and the bottom plate 13 is installed on the bottom wall of the main frame 11. Multiple side plates 14 are installed around the main frame 11 and are located between the top plate 12 and the bottom plate 13, so that the main frame 11, top plate 12, bottom plate 13, and multiple side plates 14 form a box-like structure, which is installed on the support frame 15.

[0059] The expansion compensation unit 30, heating distribution unit 40, constant pressure water supply unit 50, and control unit 60 are all installed inside the body 10. The heating distribution unit 40 and constant pressure water supply unit 50 each have multiple pipes. Because some pipes are obstructed by structures such as the buffer tank 20, expansion compensation unit 30, and control unit 60, therefore... Figure 1-5 Not all pipes are labeled; for information on the pipes of the aforementioned functional units, please refer to [reference needed]. Figure 6 (The arrows in the diagram indicate the direction of water flow.)

[0060] The buffer water tank 20 is located outside the unit body. It can be a water storage structure such as a water tank. Its main function is to store hot water, buffer water temperature and pressure fluctuations, and assist the system in venting and stabilizing pressure. Similarly, the user-end water tank can also be a water tank, but it is located outside the unit body 10 in this embodiment, serving as an expandable external structure.

[0061] The expansion compensation unit 30 is connected to the buffer water tank 20 and is used to absorb the increased water volume after the water storage unit expands due to heat. In some embodiments, the expansion compensation unit 30 includes one (this embodiment is not shown in the figure) or multiple expansion tanks.

[0062] The heating distribution unit 40 is used to connect the buffer water tank 20, the heat pump device outside the body 10, and the user heating terminal. The heating distribution unit 40 is used to distribute the hot water from the buffer water tank 20 and the heat pump device to the user heating terminal.

[0063] The constant pressure water supply unit 50 is used to connect the heating distribution unit 40 and the tap water pipeline outside the body 10, and the constant pressure water supply unit 50 is used to supply tap water to the heating distribution unit 40.

[0064] The control unit 60 is electrically connected to the expansion compensation unit 30, the heating distribution unit 40, and the constant pressure water supply unit 50, respectively. The electrical connection can be a line connection or a wireless connection. The control unit 60 is used to open and close the expansion compensation unit 30, the heating distribution unit 40, and the constant pressure water supply unit 50.

[0065] Compared to the method where each unit and module requires separate pipe installation and layout, the structure described in this embodiment integrates water storage, expansion compensation, heating distribution, constant pressure water supply and control into one unit, which greatly simplifies the heating water circuit structure at the household end, reduces on-site pipe and fitting connections, reduces installation complexity and manual dependence, and at the same time achieves stable hot water distribution, system pressure compensation and automatic regulation, thereby improving the system integration, operational reliability and construction efficiency.

[0066] It should be noted that the connection of the various units in this embodiment refers to interconnection through pipelines. However, the connection of the various pipelines or flow paths in this embodiment refers to direct or indirect connection and interconnection.

[0067] Combined with appendix Figure 2-4 As shown, in some embodiments, the body 10 of this embodiment includes a main frame 11 and a first crossbeam 111 and a second crossbeam 112 installed from top to bottom on the main frame 11. The first crossbeam 111 and the second crossbeam 112 can be horizontal crossbeams after the device is installed at the user's home.

[0068] The number of first crossbeams 111 and second crossbeams 112 can both be multiple. For example, four first crossbeams 111 can form a rectangular frame, and four second crossbeams 112 can form a rectangular frame.

[0069] The upper space is defined between the first crossbeam 111 and the top of the main frame 11. Specifically, the upper space is enclosed by the first crossbeam 111, the top plate 12, part of the side plate 14, and part of the main frame 11. The middle space is defined between the second crossbeam 112 and the first crossbeam 111. Specifically, the middle space is enclosed by the side plate 14 and part of the main frame 11 between the second crossbeam 112 and the first crossbeam 111. The lower space is defined between the second crossbeam 112 and the bottom of the main frame 11. Specifically, the lower space is enclosed by the second crossbeam 112, the bottom plate 13, part of the side plate 14, and part of the main frame 11.

[0070] By independently arranging the control unit 60 in the upper space, the control unit 60 can be physically isolated from the water circuit components below, effectively reducing the risk of water leakage and condensation corrosion to electrical components, improving the safety and service life of the device's electrical operation, and facilitating electrical wiring, parameter debugging, and fault detection.

[0071] The heating distribution unit 40 is arranged in the upper and middle spaces, which can work closely with the control unit 60 above to achieve rapid response and precise control of actuators such as valves and water pumps 412. It can also connect with the adjacent expansion compensation unit 30 and constant pressure water supply unit 50 through the through space to shorten the length of the internal connecting pipes and reduce the number of pipe bends and joints.

[0072] The expansion compensation unit 30 is arranged in the middle and lower spaces, and the constant pressure water supply unit 50 is arranged in the lower space. This concentrates the core hydraulic components such as system pressure regulation, water volume compensation, and expansion absorption in the lower part of the unit body 10. On the one hand, this can conform to the pipeline routing of gravity flow and conventional hydraulic systems, improving the efficiency of water supply, pressure stabilization, and expansion compensation. On the other hand, it lowers the center of gravity of the entire unit, enhances the structural stability of the device during installation and operation, and provides sufficient operating space for external pipelines and maintenance operations.

[0073] The interconnected upper, middle, and lower spaces facilitate unified planning and centralized layout of internal pipelines, simplify assembly processes, and make subsequent inspection, maintenance, and component replacement easier.

[0074] As can be seen from the above description, this embodiment, through the coordinated arrangement of the main frame 11, the first crossbeam 111 and the second crossbeam 112, divides the body 10 into an interconnected upper space, middle space and lower space from top to bottom, thereby achieving a clear division and orderly layout of the internal functional areas of the device, providing dedicated installation areas for each functional unit, avoiding positional interference between different functional units during installation and operation, and ensuring the independence and stability of each component's operation.

[0075] In some embodiments, the expansion compensation unit 30 includes a plurality of expansion tanks for connecting the buffer tank 20, the plurality of expansion tanks including a first expansion tank 31, a second expansion tank 32 and a third expansion tank 33 arranged from top to bottom.

[0076] The first expansion tank 31 is located in the middle space, while the second expansion tank 32 and the third expansion tank 33 are located in the lower space. The orderly arrangement of multiple expansion tanks is achieved by utilizing the vertical layered space of the body 10. Under the premise of meeting the total expansion compensation volume required by the buffer water tank 20, the space occupied by the expansion compensation unit 30 in the horizontal direction of the body 10 is reduced.

[0077] Furthermore, the multiple expansion tanks are arranged in layers along the height direction, which can make the connecting pipelines between each expansion tank and the buffer water tank 20 uniform and neatly arranged, shortening the pipeline length and reducing redundant bends in the pipeline.

[0078] The second expansion tank 32 is located below the second crossbeam 112, and the distance L1 between the second expansion tank 32 and the second crossbeam 112 along the height direction of the machine body 10 is not less than 60mm. This structure provides sufficient operating space for the production and assembly of the second expansion tank 32, and also provides sufficient operating clearance for later maintenance, gas replenishment, pressure calibration, and replacement of the expansion tank, avoiding spatial obstruction and interference from the second crossbeam 112. At the same time, this distance prevents direct contact between the second expansion tank 32 and the second crossbeam 112, blocking the transmission of expansion tank operating vibration to the machine body 10 frame, reducing structural resonance and operating noise, and improving the operational stability of the device.

[0079] The distance between the third expansion tank 33 and the base plate 13 is not less than 5mm (it is not marked because the distance is too small). In this way, the third expansion tank 33 and the base plate 13 maintain a gap of not less than 5mm, which can reduce the possibility of water accumulation forming a water film and corroding the third expansion tank 33, thereby extending the service life of the third expansion tank 33.

[0080] In some embodiments, the control unit 60 includes an electronic control component 61 and a power distribution component 62. The lower end of the electronic control component 61 is hinged to the body 10 and configured to be able to flip to be located outside the body 10.

[0081] The control unit 60 is designed to be flip-out, which not only facilitates the operation and maintenance of the control unit 60, but also facilitates the operation and maintenance of the pipeline inside the control unit 60, greatly improving the efficiency of operation and maintenance.

[0082] The power distribution component 62 is used to connect the indoor power supply and then distribute it to the various electrical devices in the heat pump heating water system. The electrical control component 61 is used to control the normal operation of the various components inside the body 10.

[0083] Combined with appendix Figure 7-10 As shown, in some embodiments, the body 10 is provided with multiple limiting structures. The expansion tank is installed on the limiting structure and is detachably connected to the body 10. The limiting structure is used to limit the displacement of the expansion tank in the thickness direction. One end of the expansion tank along the length direction is detachably connected to the body 10. When the detachable connection between the expansion tank and the body 10 is released, the limiting structure and the expansion tank are guided and engaged along the length direction of the expansion tank so that the expansion tank can be pulled out of the body 10 under the guidance of the limiting structure.

[0084] The expansion tank is detachably connected to the body 10 by using a limiting structure to restrict the displacement in the thickness direction. The limiting structure and the expansion tank are designed to guide each other, so that after the expansion tank is detached from the body 10, it is easy to pull out the expansion tank in a preset direction.

[0085] When there are three expansion tanks, there are also three limiting structures: a first limiting structure (not shown in the figure), a second limiting structure 17, and a third limiting structure 18. Specifically, the first expansion tank 31 is installed on the first limiting structure, the second expansion tank 32 is installed on the second limiting structure 17, and the third expansion tank 33 is installed on the third limiting structure 18.

[0086] In some embodiments, the first limiting structure may include a groove or a rail.

[0087] The thickness direction of the first expansion tank 31 is aligned with the height direction of the body 10 to reduce the height space occupied by the first expansion tank 31 in the body 10, thereby reducing the overall height of the body.

[0088] In some embodiments, the second limiting structure 17 includes a second limiting member 171, which may have the same structure as the first limiting member 161 described above.

[0089] For example, the second limiting member 171 in the figure is a channel steel structure with an approximately U-shaped cross section. In this case, the second limiting member 171 includes a second supporting part 1711 and second limiting parts 1712 located on both sides of the second supporting part 1711 along the width direction. The two second limiting parts 1712 and the second supporting part 1711 surround the slide groove. The two second limiting parts 1712 are the side walls of the slide groove, and the second supporting part 1711 is the bottom wall of the slide groove.

[0090] In this embodiment, the bottom of the second expansion tank 32 is located in the groove. The second support part 1711 serves as the support base for the second expansion tank 32, and the second limiting part 1712 limits both sides of the second expansion tank 32 in the thickness direction. This not only simplifies the structure but also maintains the stability of the position of the first expansion tank 31 after the second expansion tank 32 is connected to the body 10.

[0091] In this embodiment, the width of the second expansion tank 32 is arranged along the height of the body 10. The side wall of the second expansion tank 32 is provided with a second annular flange 321 surrounding itself. Along the width of the second expansion tank 32, one side of the second annular flange 321 is placed on the second support portion 1711 and located between the two second limiting portions 1712. The second annular flange 321 not only serves as a support point for the second expansion tank 32, but also improves the structural strength of the second expansion tank 32.

[0092] In some embodiments, the thickness direction of the third expansion tank 33 is set along the height direction of the body 10, the side wall of the third expansion tank 33 is provided with a third annular flange 331 surrounding itself, and the third limiting structure 18 includes two support members 181 and a third limiting member 182, both of which are mounted on the base plate 13.

[0093] The cross-sectional shape of the support member 181 is approximately Z-shaped. The top of the support member 181 is provided with a support portion extending toward the third expansion tank 33. Along the width direction of the third expansion tank 33, the two sides of the third annular flange 331 are located on the two support members 181.

[0094] The third limiting member 182 is located at the end of the third expansion tank 33 opposite to the connection between itself and the body 10, and abuts against the upper surface of the third annular flange 331. The two supporting members 181 not only support the third expansion tank 33, but also create a gap between the third expansion tank 33 and the base plate 13. The third expansion tank 33 can be supported and guided during the removal process, while the third limiting member 182 can limit the upward displacement of the third expansion tank 33, thereby improving the stability of the third expansion tank 33 after it is installed in the body 10.

[0095] In some embodiments, the third limiting member 182 of this embodiment includes a third limiting part 1821 and a fourth limiting part 1822 connected at an angle. The third limiting part 1821 is disposed facing the third expansion tank 33 and is used to limit the displacement of the third expansion tank 33 along its own length direction. The fourth limiting part 1822 is located above the third annular flange 331 and abuts against the upper surface, and is used to limit the upward displacement of the third expansion tank 33.

[0096] Of course, the structure of the third limiting member 182 in this embodiment is not limited to this. As shown in the figure, the fourth limiting part 1822 is provided with reinforcing ribs on both sides along the width direction of the third expansion tank 33, so that the third limiting member 182 can also approximate the shape of a box to improve the structural strength of the third limiting member 182.

[0097] In addition, to simplify the pipeline structure, the compensation pipeline 34 of the expansion compensation unit 30 includes a main pipeline 342 and multiple sub-pipelines 343 connected in parallel to the main pipeline. The main pipeline 342 is connected to the buffer water tank 20, and the multiple sub-pipelines 343 are detachably connected to multiple expansion tanks one by one.

[0098] This structure, which connects multiple sub-pipes 343 to a main pipe 342, simplifies the piping structure of the expansion compensation unit 30, and the detachable connection between the sub-pipes and the expansion tank also facilitates the removal of the expansion tank from the body 10.

[0099] Combined with appendix Figure 7As shown, the heating distribution unit 40 in this embodiment includes a heating outlet pipe 41 and a heating return pipe 42. The heating outlet pipe 41 is provided with at least one heating outlet 4111 for connecting to a user's heating terminal, and the heating return pipe 42 is provided with at least one heating return outlet for connecting to a user's heating terminal. The independent heating outlet pipe 41 and return pipe can adapt to the connection needs of different user terminals.

[0100] Taking the structure of the two heating water outlets 4111 and two heating water return outlets in the diagram as an example, specifically, the heating water outlet pipe 41 includes a main outlet pipe and two first sub-pipes 411. Each of the two first sub-pipes 411 is equipped with a water pump 412, and each of the two first sub-pipes 411 has a heating water outlet 4111 at one end. Similarly, the heating water return pipe 42 includes a main return pipe and two second sub-pipes 421, each of the two second sub-pipes 421 having a heating water return outlet 4211. One of the first sub-pipes 411 and one of the second sub-pipes 421 are connected via a second three-way valve 49.

[0101] In addition, the heating distribution unit 40 also includes a first connecting pipe 43, a first three-way valve 44, a water storage return flow path 45, a water storage outlet flow path 46, a heat pump outlet flow path 47, and a heat pump return flow path 48.

[0102] One end of the first connecting pipe 43 is connected to the heating outlet pipe 41, and the other end of the first connecting pipe 43 is connected to the first interface of the first three-way valve 44. The first connecting pipe 43 is used to return water to the heating outlet pipe 41.

[0103] The inlet of the water storage return flow path 45 is connected to the second interface of the three-way valve, the outlet of the water storage return flow path 45 is used to connect to the user end water tank outside the body 10, the inlet of the heat pump outlet flow path 47 is used to connect to the heat pump device outside the body 10, and the outlet of the heat pump outlet flow path 47 is connected to the third interface of the first three-way valve 44.

[0104] The heat pump outlet water flow path 47 is used to receive the water inlet of the heat pump device and distribute the water inlet to the water storage return flow path 45 and the first connecting pipe 43 through the first three-way valve 44, so that the water storage return flow path 45 can be used to return water to the user end water tank outside the body 10.

[0105] The inlet of the heat pump return water flow path 48 is connected to the buffer water tank 20, the outlet of the heat pump return water flow path 48 is used to connect the heat pump device, the inlet of the storage water outlet flow path 46 is connected to the user end water tank, and the outlet of the storage water outlet flow path 46 is connected in parallel with the water supply pipeline of the constant pressure water supply unit 50 and is connected to the inlet of the heat pump return water flow path together.

[0106] The water storage outlet path 46 is used to receive water from the user-end water tank outside the unit 10 and transport it to the heat pump return water path. The heat pump return water path 48 is used to receive water from the buffer water tank 20, the water storage outlet path 46, and the tap water replenishment path 51. This structure achieves controllable switching and connection integration between the first connecting pipe 43, the water storage return flow path 45, and the heat pump outlet flow path 47 through the first three-way valve 44. It can flexibly switch the heating output object and circulation path. At the same time, the first water storage outlet unit and the constant pressure water supply unit 50 are connected in parallel to the heat pump return end, integrating multiple functions such as heating, heat pump heating, and water storage, thereby improving the system integration and the flexibility of the operation mode.

[0107] In some embodiments, a first filter 481 is provided on the heat pump return water path 48. The first filter 481 may be a magnetic filter, which can effectively filter impurities in the return water, protect the heat pump device, and extend its service life.

[0108] In some embodiments, the height of the first filter 481 is consistent with the height of the outlet of the heat pump return water flow path 48, and / or, the body 10 is provided with sidewalls, and the minimum distance L2 between the first filter 481 and its nearest sidewall is not less than 85mm. The first filter 481 being at the same height as the main outlet and having a sidewall gap of not less than 85mm can avoid the problems of water accumulation and excessive water resistance, and also facilitate the disassembly and cleaning of the filter element.

[0109] In some embodiments, the outlet of the water storage return flow path 45, the inlet of the water storage outlet flow path 46, and the inlet of the heat pump outlet flow path 47 are located on the same side of the body 10.

[0110] By concentrating the interfaces connecting the external user-end water tank and the heat pump unit on the same side of the unit body 10, the connection of external pipelines is simplified, making on-site installation faster.

[0111] It is understood that in this embodiment, "outlet" refers to the pipe port from which water flows out, and "inlet" refers to the pipe port from which water flows in.

[0112] Combined again with the appendix Figure 7 As shown, in some embodiments, the constant pressure water supply unit 50 includes a tap water supply path 51 and a tap water return path 52. The inlet of the tap water supply path 51 is used to connect to a tap water source, and the outlet of the tap water supply path 51 is used to connect to the heating distribution unit 40. The inlet of the tap water return path 52 is connected to the tap water supply path 51, and the outlet of the tap water return path 52 is used to discharge tap water.

[0113] This structure enables the constant pressure water supply unit 50 to form a dual-path structure integrating water inlet and outlet, which can realize automatic water supply and safe overflow, prevent tap water backflow, and ensure the safety and reliability of the device operation.

[0114] In some embodiments, from the inlet to the outlet of the tap water supply flow path 51, a first safety valve 511, a check valve 512, a second filter 513, and an isolation drain valve 514 are sequentially provided on the tap water supply flow path 51. In this embodiment, the check valve 512 and the isolation drain valve 514 are configured to switch between open and closed states, and the second filter 513 is configured to be detachably connected to the tap water supply flow path.

[0115] The tap water supply flow path is equipped with a first safety valve 511, a check valve 512, a second filter 513, and an isolation drain valve 514, forming a complete function of protection, water supply, filtration, and sewage discharge, which effectively improves the quality of the water supply and the safety of the device.

[0116] Furthermore, when the second filter 513 needs to be repaired or replaced, the check valve 512 and the isolation drain valve 514 can be closed directly to stop the flow of water in the tap water supply path 51, and then the second filter 513 can be removed directly.

[0117] In some embodiments, the bottom of the second filter 513 is provided with a drain valve 5131, which can be a mechanical valve or an electronic valve. The drain valve 5131 can drain the accumulated water and release the pressure when the filter element of the second filter 513 is replaced, thereby reducing the possibility of contamination caused by residual water and improving the convenience of maintenance.

[0118] In some embodiments, the second filter 513 has a first connector 5132 for connecting the check valve 512 and a second connector 5133 for connecting the isolation drain valve 514. The first connector 5132 is detachably connected to the check valve 512, and the second connector 5133 is detachably connected to the isolation drain valve 514.

[0119] The first connector 5132 and the check valve 512 can be detachably connected by bolts, plugs, or snaps. Similarly, the second connector 5133 and the isolation drain valve 514 can also be detachably connected by bolts, plugs, or snaps. This detachable connection makes the second filter 513 easier to install and remove, allowing for filter element replacement without complicated tools, thus facilitating the maintenance and replacement of the second filter 513.

[0120] In some embodiments, both the first connector 5132 and the second connector 5133 are provided with an exhaust valve (this embodiment is not shown in the figure), or the isolation drain valve 514 is provided with an openable and closable exhaust port (this embodiment is not shown in the figure).

[0121] The vent valves of the first connector 5132 and the second connector 5133, or the isolation drain valve 514 with a vent, can effectively discharge the gas in the second filter 513, avoid air blockage, make the water flow smoother, and improve the filtration efficiency.

[0122] In some embodiments of the present invention, a fourth expansion tank 521 is provided on the tap water return flow path 52. The fourth expansion tank 521 can stabilize the pressure of the domestic water system, avoid pressure fluctuations from affecting the water usage experience, and improve the stability of the domestic water system.

[0123] In some embodiments, the fourth expansion tank 521 of this embodiment is located in the lower space and partially below the second crossbeam 112. The distance L3 between the fourth expansion tank 521 and the second crossbeam 112 along the height direction of the body 10 is not less than 60mm. The fourth expansion tank 521 has a top space of not less than 60mm to facilitate gas replenishment operation, while also optimizing the spatial layout and improving the compactness of the device.

[0124] Combined again with the appendix Figure 4 As shown, in some embodiments, the expansion compensation unit 30 includes a compensation pipeline 34 and a plurality of expansion tanks. One end of the compensation pipeline 34 is connected to the water storage unit, and the other end is connected to the plurality of expansion tanks respectively.

[0125] The compensation pipeline 34 is equipped with a second safety valve 341, the second safety valve 341 is equipped with a first drain port 3411, the body 10 is equipped with a base plate 13, and the distance L4 between the first drain port 3411 and the base plate 13 is not less than 300mm.

[0126] Setting the discharge port of the first safety valve 511 at a position at least 300mm higher than the base plate 13 ensures that the discharged water is completely drained, reducing the possibility of residual water causing safety hazards and equipment corrosion.

[0127] In some embodiments, the check valve 512 is provided with a second drain port (not shown in the figure), and the first safety valve 511 is provided with a third drain port (not shown in the figure). Correspondingly, the body 10 of this embodiment is provided with a main drain port 16. The second drain port and the third drain port are both connected to the main drain port 16 by pipeline. The height of the first drain port 3411 on the body 10 is greater than the height of the main drain port 16 on the body 10.

[0128] This structure connects the discharge ports of multiple safety valves to the same drainage pipe for centralized drainage, simplifying the structure. Moreover, the height of the first drainage port 3411 is higher than that of the main drainage port 16, which can prevent backflow of drainage and improve the reliability of the overflow function.

[0129] Based on the aforementioned heating end hydraulic device 100, this embodiment also provides a heating and ventilation system (HVAC) device, including the aforementioned heating end hydraulic device 100. Other structures of the HVAC device (such as user heating terminals) are not described in this embodiment; please refer to relevant technologies.

[0130] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hydraulic device for heating households, characterized in that, include: Organism; An expansion compensation unit is installed on the machine body and is used to connect to a buffer water tank outside the machine body. The expansion compensation unit is configured to absorb the increased water volume after the buffer water tank expands due to heat. A heating distribution unit is used to connect to a buffer water tank, a heat pump device, and a user heating terminal outside the machine body. The heating distribution unit is used to distribute the hot water from the buffer water tank and the heat pump device to the user heating terminal. A constant pressure water supply unit is installed on the body and is used to connect the heating distribution unit and the tap water pipe outside the body. The constant pressure water supply unit is used to supply tap water to the heating distribution unit. as well as The control unit is installed on the machine body and is electrically connected to the expansion compensation unit, the heating distribution unit and the constant pressure water supply unit respectively, and is used to open and close the expansion compensation unit, the heating distribution unit and the constant pressure water supply unit.

2. The heating household hydraulic device according to claim 1, characterized in that, The control unit and the heating distribution unit are installed in the upper space of the body, the expansion compensation unit is located in the middle space and / or lower space of the body, and the constant pressure water supply unit is located in the lower space of the body.

3. The heating household hydraulic device according to claim 2, characterized in that, The body includes a main frame and a first crossbeam and a second crossbeam installed from top to bottom on the main frame. An upper space is defined between the first crossbeam and the top of the main frame, a middle space is defined between the second crossbeam and the first crossbeam, and a lower space is defined between the second crossbeam and the bottom of the main frame. The upper space, the middle space, and the lower space are interconnected.

4. The heating household hydraulic device according to claim 3, characterized in that, The expansion compensation unit includes multiple expansion tanks for connecting the buffer water tank. The multiple expansion tanks include a first expansion tank, a second expansion tank, and a third expansion tank arranged sequentially from top to bottom. Along the height direction of the body, there are reserved disassembly and assembly spaces above the first expansion tank, the second expansion tank, and the third expansion tank. The height of the disassembly and assembly spaces is not less than 60mm.

5. The heating household hydraulic device according to claim 4, characterized in that, The machine body has a base plate, and the third expansion tank is disposed above the base plate. Along the height direction of the machine body, the distance between the third expansion tank and the base plate is not less than 5mm.

6. The heating household hydraulic device according to claim 1, characterized in that, The control unit includes an electronic control component, the lower end of which is hinged to the body and configured to be flipped to a position outside the body.

7. The heating household hydraulic device according to claim 1, characterized in that, The expansion compensation unit includes an expansion tank connected to the buffer water tank. The body is provided with a limiting structure. The expansion tank is installed on the limiting structure and is detachably connected to the body. The limiting structure is used to limit the displacement of the expansion tank in the thickness direction. One end of the expansion tank along the length direction is detachably connected to the body.

8. The heating household hydraulic device according to claim 7, characterized in that, When the detachable connection between the expansion tank and the body is released, the limiting structure guides the expansion tank along the length of the expansion tank so that the expansion tank can be pulled out of the body under the guidance of the limiting structure.

9. The heating household hydraulic device according to claim 1, characterized in that, The heating distribution unit includes a heating outlet pipe and a heating return pipe. The heating outlet pipe is provided with at least one heating outlet for connecting to the user's heating terminal, and the heating return pipe is provided with at least one heating return outlet for connecting to the user's heating terminal.

10. The heating household hydraulic device according to claim 9, characterized in that, The heating distribution unit further includes a first connecting pipe, a first three-way valve, a water storage return path, a water storage outlet path, a heat pump outlet path, and a heat pump return path; one end of the first connecting pipe is connected to the heating outlet pipe, and the other end of the first connecting pipe is connected to the first interface of the first three-way valve; the inlet of the water storage return path is connected to the second interface of the first three-way valve, and the outlet of the water storage return path is used to connect to the user-side water tank outside the unit; the heat pump outlet path... The inlet of the flow path is used to connect to the heat pump device outside the machine body, and the outlet of the heat pump outlet flow path is connected to the third interface of the first three-way valve; the inlet of the heat pump return flow path is connected to the buffer water tank, and the outlet of the heat pump return flow path is used to connect to the heat pump device; the inlet of the water storage outlet flow path is connected to the user end water tank, and the outlet of the water storage outlet flow path is connected in parallel with the water supply pipeline of the constant pressure water supply unit and together connected to the inlet of the heat pump return flow path.

11. The heating household hydraulic device according to claim 10, characterized in that, The heat pump return water path is equipped with a first filter.

12. The heating household hydraulic device according to claim 11, characterized in that, Along the height direction of the machine body, the first filter is positioned flush with the outlet of the heat pump return water flow path. And / or, the body is provided with sidewalls, and the minimum distance between the first filter and its nearest sidewall is not less than 85mm.

13. The heating household hydraulic device according to claim 10, characterized in that, The outlet of the water storage return flow path, the inlet of the water storage outlet flow path, and the inlet of the heat pump outlet flow path are located on the same side of the machine body.

14. The heating household hydraulic device according to any one of claims 1-13, characterized in that, The constant pressure water supply unit includes a tap water supply path and a tap water return path. The inlet of the tap water supply path is used to connect to the tap water source, and the outlet of the tap water supply path is used to connect to the heating distribution unit. The inlet of the tap water return path is connected to the tap water supply path, and the outlet of the tap water return path is used to discharge tap water.

15. The heating household hydraulic device according to claim 14, characterized in that, From the inlet to the outlet of the tap water supply flow path, a first safety valve, a check valve, a second filter, and an isolation drain valve are sequentially provided on the tap water supply flow path. The check valve and the isolation drain valve are configured to switch between open and closed states, and the second filter is configured to be detachably connected to the tap water supply flow path.

16. The heating household hydraulic device according to claim 15, characterized in that, The second filter is equipped with a drain valve at the bottom.

17. The heating household hydraulic device according to claim 16, characterized in that, The second filter has a first connector for connecting the check valve and a second connector for connecting the isolation drain valve. The first connector is detachably connected to the check valve and the second connector is detachably connected to the isolation drain valve.

18. The heating household hydraulic device according to claim 17, characterized in that, Both the first connector and the second connector are equipped with exhaust valves, or the isolation drain valve is equipped with an openable and closable exhaust port.

19. The heating household hydraulic device according to claim 14, characterized in that, A fourth expansion tank is provided on the tap water return flow path.

20. The heating household hydraulic device according to claim 19, characterized in that, The body includes a main frame and a first crossbeam and a second crossbeam installed from top to bottom on the main frame. An upper space is defined between the first crossbeam and the top of the main frame, a middle space is defined between the second crossbeam and the first crossbeam, and a lower space is defined between the second crossbeam and the bottom of the main frame. The upper space, the middle space, and the lower space are interconnected. The fourth expansion tank is located in the lower space and is partially located below the second crossbeam. The distance between the fourth expansion tank and the second crossbeam along the height direction of the body is not less than 60mm.

21. The heating household hydraulic device according to claim 15, characterized in that, The expansion compensation unit includes a compensation pipeline and multiple expansion tanks. One end of the compensation pipeline is connected to a buffer water tank, and the other end is connected to multiple expansion tanks respectively. A second safety valve is provided on the compensation pipeline. The second safety valve has a first drain outlet. The body is provided with a base plate. The distance between the first drain outlet and the base plate is not less than 300mm.

22. The heating household hydraulic device according to claim 21, characterized in that, The check valve is provided with a second drain port, the first safety valve is provided with a third drain port, and a main drain port is provided on one side plate of the machine body. The second drain port and the third drain port are both connected to the main drain port by pipelines. The height of the first drain port on the machine body is greater than the height of the main drain port on the machine body.

23. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, Includes the heating end hydraulic device as described in any one of claims 1-22.

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