A low temperature heat pump system

Abstract

The utility model provides a low temperature heat pump system relates to heat pump system field. This low temperature heat pump system forms the output end for connecting with user side, and this output end includes the first heat exchanger and second heat exchanger of setting in proper order, the first heat exchanger with the second heat exchanger is communicated with the compressor through main circuit, and the first heat exchanger with the second heat exchanger is connected with the user side through auxiliary branch, when the hot water of user side preparation, the working medium in the compressor flows through the second heat exchanger and the first heat exchanger in proper order, and the water source of water inlet end of auxiliary branch is exported after flowing through the first heat exchanger and the second heat exchanger in proper order, when the cold water of user side preparation, the working medium in the compressor flows through the first heat exchanger and the second heat exchanger in proper order, and the water source of water inlet end of auxiliary branch is exported after flowing through the first heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat pump systems, and in particular to a low-temperature heat pump system. Background Technology

[0002] In recent years, due to the intensifying greenhouse effect, the application of low-GWP refrigerants in new refrigeration systems has become a top priority for major manufacturers. Among these, low-temperature heat pumps using R32 refrigerant have become the preferred solution for heating projects in northern regions.

[0003] In this low-temperature heat pump system, to ensure the reliability of the compressor, the maximum condensing temperature of the compressor is set to 65℃. Considering the 3℃ heat exchange temperature difference, the system's outlet water temperature is only about 62℃. However, in northern heating applications, some indoor heat exchangers use outdated radiators with low heat exchange efficiency, requiring a maximum water temperature of over 65℃, and in some scenarios, even a maximum outlet water temperature of 67℃. Existing low-temperature heat pump systems are unable to meet these outlet water temperature requirements. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a low-temperature heat pump system to solve the problem that existing low-temperature heat pump systems using R32 refrigerant cannot meet the water output requirements of 65℃~67℃.

[0005] In accordance with the above objectives, this utility model provides a low-temperature heat pump system having an output terminal for connection to a user side. The output terminal includes a first heat exchanger and a second heat exchanger arranged sequentially. The first heat exchanger and the second heat exchanger are connected to a compressor through a main circuit, and the first heat exchanger and the second heat exchanger are connected to the user side through an auxiliary branch. When hot water is produced on the user side, the working fluid in the compressor flows sequentially through the second heat exchanger and the first heat exchanger, and the water source at the inlet of the auxiliary branch flows sequentially through the first heat exchanger and the second heat exchanger before being output; When the user side produces cold water, the working fluid in the compressor flows sequentially through the first heat exchanger and the second heat exchanger, and the water source at the inlet of the auxiliary branch flows through the first heat exchanger and is then output.

[0006] Preferably, the auxiliary branch includes a first auxiliary branch, the two ends of which are respectively connected to the water source and the first connection port of the first heat exchanger; The auxiliary branch includes a second auxiliary branch, the two ends of which are respectively connected to the second connection port of the first heat exchanger and the first connection port of the second heat exchanger. The auxiliary branch includes a third auxiliary branch, the two ends of which are respectively connected to the second connection port of the second heat exchanger and the user side.

[0007] Preferably, a first solenoid valve is provided in the second auxiliary branch.

[0008] Preferably, the auxiliary branch includes a fourth auxiliary branch, the two ends of which are respectively connected to the second auxiliary branch and the user side, and the fourth auxiliary branch is connected between the first solenoid valve and the first heat exchanger; the fourth auxiliary branch is provided with a second solenoid valve.

[0009] Preferably, the low-temperature heat pump system further includes a four-way valve, a third heat exchanger, a fourth heat exchanger, and a gas-liquid separator.

[0010] Preferably, the four-way valve has a first opening, a second opening, a third opening, and a fourth opening; inside the four-way valve, the first opening can communicate with the second opening, the second opening can communicate with the third opening, the third opening can communicate with the fourth opening, and the fourth opening can communicate with the first opening.

[0011] Preferably, the main circuit includes a first branch and a second branch, the compressor outlet is connected to the first opening through the first branch; the second opening is connected to the first connection port of the third heat exchanger through the second branch.

[0012] Preferably, the main circuit includes a third branch, and the second connection port of the third heat exchanger is connected to the first connection port of the fourth heat exchanger through the third branch; The main circuit includes a fourth branch, and the second connection port of the fourth heat exchanger is connected to the third connection port of the first heat exchanger through the fourth branch.

[0013] Preferably, the main circuit includes a fifth branch, and the fourth connection port of the first heat exchanger is connected to the third connection port of the second heat exchanger through the fifth branch; The main circuit includes a sixth branch, and the fourth connection port of the second heat exchanger is connected to the fourth opening through the sixth branch; The main circuit includes a seventh branch, and the third opening is connected to the first inlet of the compressor through the seventh branch. The gas-liquid separator is installed in the seventh branch.

[0014] Preferably, the main circuit includes an eighth branch, the two ends of which are respectively connected to the third branch and the third connection port of the fourth heat exchanger; The main circuit includes a ninth branch, the two ends of which are connected to the fourth connection port of the fourth heat exchanger and the second inlet of the compressor, respectively.

[0015] According to the present invention, the low-temperature heat pump system exchanges heat with the user side through the output end. The output end of the system includes a first heat exchanger and a second heat exchanger arranged in sequence. When the user side needs to produce hot water, the water source flows through the first heat exchanger and the second heat exchanger in sequence and is then output. That is, the system can heat the water source twice, thereby outputting hot water at a higher temperature. In other words, the system can meet the water output requirements of 65℃~67℃.

[0016] In addition, this system can also produce cold water. In this case, the water source does not flow into the second heat exchanger, but directly exchanges heat with the working fluid through the first heat exchanger and is then output.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the low-temperature heat pump system in cooling mode according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the low-temperature heat pump system in heating mode according to an embodiment of the present invention.

[0020] Icons: 11-First branch; 12-Second branch; 13-Third branch; 14-Fourth branch; 15-Fifth branch; 16-Sixth branch; 17-Seventh branch; 18-Eighth branch; 19-Ninth branch; 21-First auxiliary branch; 22-Second auxiliary branch; 23-Third auxiliary branch; 24-Fourth auxiliary branch; 31-First heat exchanger; 32-Second heat exchanger; 33-Third heat exchanger; 34-Fourth heat exchanger; 41-Compressor; 42-Four-way valve; 43-First electronic expansion valve; 44-Liquid storage tank; 45-Gas-liquid separator; 51-First solenoid valve; 52-Second solenoid valve; 53-Second electronic expansion valve. Detailed Implementation

[0021] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0022] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0023] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0024] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0025] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0026] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0028] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0029] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0030] This utility model provides a low-temperature heat pump system, such as... Figures 1 to 2 As shown, the low-temperature heat pump system in this embodiment has an output terminal for connection to the user side. This output terminal can exchange heat with water flowing from a water source to heat or cool the water, thereby providing the user with hot or cold water as needed. Specifically, the output terminal includes a first heat exchanger 31 and a second heat exchanger 32 arranged sequentially. The first heat exchanger 31 and the second heat exchanger 32 are connected to the compressor 41 via a main circuit, and the first heat exchanger 31 and the second heat exchanger 32 are connected to the user side via an auxiliary branch. The specific structure and connection relationships of the above-mentioned parts of the low-temperature heat pump according to this utility model will be described in detail below.

[0031] In this embodiment, as Figures 1 to 2As shown, the auxiliary branches include a first auxiliary branch 21, whose two ends are connected to the water source and the first connection port of the first heat exchanger 31, respectively. The auxiliary branches include a second auxiliary branch 22, whose two ends are connected to the second connection port of the first heat exchanger 31 and the first connection port of the second heat exchanger 32, respectively. A first solenoid valve 51 is installed in the second auxiliary branch 22. The auxiliary branches include a third auxiliary branch 23, whose two ends are connected to the second connection port of the second heat exchanger 32 and the user side, respectively. Hot water can be output through the third auxiliary branch 23.

[0032] In addition, the auxiliary branch includes a fourth auxiliary branch 24, whose two ends are connected to the second auxiliary branch 22 and the user side, respectively. The fourth auxiliary branch 24 is connected between the first solenoid valve 51 and the first heat exchanger 31, and a second solenoid valve 52 is installed in the fourth auxiliary branch 24. Cold water can be output through the fourth auxiliary branch 24.

[0033] In this embodiment, as Figures 1 to 2 As shown, the low-temperature heat pump system also includes a compressor 41, a four-way valve 42, a third heat exchanger 33, a fourth heat exchanger 34, and a gas-liquid separator 45. The four-way valve 42 has a first opening, a second opening, a third opening, and a fourth opening; inside the four-way valve 42, the first opening can communicate with the second opening, the second opening can communicate with the third opening, the third opening can communicate with the fourth opening, and the fourth opening can communicate with the first opening.

[0034] In addition, the main circuit includes a first branch 11 and a second branch 12. The outlet of the compressor 41 is connected to the first opening of the four-way valve 42 through the first branch 11, and the second opening of the four-way valve 42 is connected to the first connection port of the third heat exchanger 33 through the second branch 12. The main circuit includes a third branch 13, and the second connection port of the third heat exchanger 33 is connected to the first connection port of the fourth heat exchanger 34 through the third branch 13. A first electronic expansion valve 43 is installed on the third branch 13. The main circuit includes a fourth branch 14, and the second connection port of the fourth heat exchanger 34 is connected to the third connection port of the first heat exchanger 31 through the fourth branch 14. A liquid storage tank 44 is installed on the fourth branch 14 (the liquid storage tank 44 can store refrigerant under some heating conditions).

[0035] Furthermore, the main circuit includes a fifth branch 15, through which the fourth connection port of the first heat exchanger 31 is connected to the third connection port of the second heat exchanger 32. The main circuit also includes a sixth branch 16, through which the fourth connection port of the second heat exchanger 32 is connected to the fourth opening of the four-way valve 42. Finally, the main circuit includes a seventh branch 17, through which the third opening of the four-way valve 42 is connected to the first inlet of the compressor 41. A gas-liquid separator 45 is also installed on the seventh branch 17.

[0036] The main circuit includes an eighth branch 18, the two ends of which are connected to the third branch 13 and the third connection port of the fourth heat exchanger 34, respectively. A second electronic expansion valve 53 is installed on the eighth branch 18. The main circuit also includes a ninth branch 19, the two ends of which are connected to the fourth connection port of the fourth heat exchanger 34 and the second inlet of the compressor 41, respectively.

[0037] like Figure 1 As shown, when the user needs to produce chilled water (i.e., when the system is in cooling mode), the control module controls the first and second openings of the four-way valve 42 to connect, and the third and fourth openings to connect. The compressor 41 compresses the low-temperature, low-pressure gaseous working fluid into a high-temperature, high-pressure gaseous working fluid. The high-temperature, high-pressure gaseous working fluid flows sequentially through the first branch 11, the first and second openings of the four-way valve 42, and the second branch 12 into the third heat exchanger 33, where it releases heat and condenses into a medium-temperature, high-pressure liquid working fluid. This medium-temperature, high-pressure liquid working fluid is then throttled and depressurized by the first electronic expansion valve 43 to form a low-temperature, low-pressure liquid working fluid. This working fluid sequentially passes through the first connection port, the second connection port (where no heat exchange occurs), and the fourth connection port of the fourth heat exchanger 34. Branch 14 flows into the first heat exchanger 31, where it absorbs heat and evaporates to form a low-temperature, low-pressure two-phase working fluid (the second electronic expansion valve 53 at the third connection port of the fourth heat exchanger 34 is closed, preventing the refrigerant from replenishing the compressor). This low-temperature, low-pressure two-phase working fluid sequentially passes through the fifth branch 15, the second heat exchanger 32, the sixth branch 16, the fourth and third openings of the four-way valve 42, the seventh branch 17, and the gas-liquid separator 45 to form a low-temperature, low-pressure gaseous working fluid, which then flows back to the compressor 41 to complete a refrigeration cycle.

[0038] Correspondingly, when the system is in cooling mode, the control module controls the first solenoid valve 51 to close and the second solenoid valve 52 to open. Water flows into the first heat exchanger 31 through the first auxiliary branch 21 and releases heat. The cooled water then flows out through the second auxiliary branch 22 and the fourth auxiliary branch 24.

[0039] like Figure 2As shown, when the user needs to produce hot water (i.e., when the system is in heating mode), the control module controls the first and fourth openings of the four-way valve 42 to connect, and the third opening to connect with the second opening. The compressor 41 compresses the low-temperature, low-pressure gaseous working fluid into a high-temperature, high-pressure gaseous working fluid. The high-temperature, high-pressure gaseous working fluid flows sequentially through the first branch 11, the first and fourth openings of the four-way valve 42, and the sixth branch 16 into the second heat exchanger 32, where it releases heat and forms a medium-temperature, high-pressure gaseous working fluid. This medium-temperature, high-pressure gaseous working fluid flows through the fifth branch 15 into the first heat exchanger 31 for further heat release and condensation, forming a medium-temperature, high-pressure liquid working fluid. This working fluid sequentially passes through the fourth branch 14, the second connection port of the fourth heat exchanger 34, and the first connection port, where it is cooled into a medium-temperature, high-pressure subcooled liquid working fluid. This working fluid flows to the third branch 13 and is then processed in the third branch 13. The end is divided into two parts. One part is fed back to the compressor 41 through the eighth branch 18, the second electronic expansion valve 53, the third connection port and the fourth connection port of the fourth heat exchanger 34 (where it absorbs heat and evaporates into a low-temperature, low-pressure gaseous working fluid in the fourth heat exchanger 34), and the ninth branch 19. The other part is throttled into a low-temperature, low-pressure hydraulic working fluid by the first electronic expansion valve 43 through the third branch 13, and flows into the third heat exchanger 33 to absorb heat and evaporate into a low-temperature, low-pressure gaseous working fluid. The low-temperature, low-pressure gaseous working fluid flows back to the compressor 41 after passing through the second branch 12, the second opening and the third opening of the four-way valve 42, the seventh branch 17, and the gas-liquid separator 45 to complete a heating cycle.

[0040] Correspondingly, when the system is in heating mode, the control module controls the first solenoid valve 51 to open and the second solenoid valve 52 to close. Water flows into the first heat exchanger 31 through the first auxiliary branch 21 and absorbs heat, and then flows into the second heat exchanger 32 through the second auxiliary branch 22 to absorb heat further. The hot water (which can reach 67°C) after being heated twice flows out through the third auxiliary branch 23.

[0041] It should be noted that adjusting the heat pump system to different operating modes via a control module is a conventional technique in this field, therefore the specific form and working principle of the control module will not be elaborated further.

[0042] According to this utility model, the low-temperature heat pump system exchanges heat with the user side through its output end. The output end of the system includes a first heat exchanger 31 and a second heat exchanger 32 arranged sequentially. When the user side needs to produce hot water, the water source flows through the first heat exchanger 31 and the second heat exchanger 32 in sequence before being output. That is, the system can heat the water source twice, thereby outputting hot water at a relatively high temperature, which can meet the water output requirement of 65℃~67℃. In addition, the system can also produce cold water. In this case, the water source does not flow into the second heat exchanger 32, but directly exchanges heat with the working fluid through the first heat exchanger 31 before being output.

[0043] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A low-temperature heat pump system formed with an output for connection to a user side, characterized by, The output end includes a first heat exchanger and a second heat exchanger arranged in sequence. The first heat exchanger and the second heat exchanger are connected to the compressor through a main circuit, and the first heat exchanger and the second heat exchanger are connected to the user side through an auxiliary branch. When hot water is produced on the user side, the working fluid in the compressor flows sequentially through the second heat exchanger and the first heat exchanger, and the water source at the inlet of the auxiliary branch flows sequentially through the first heat exchanger and the second heat exchanger before being output; When the user side produces cold water, the working fluid in the compressor flows sequentially through the first heat exchanger and the second heat exchanger, and the water source at the inlet of the auxiliary branch flows through the first heat exchanger and is then output.

2. The low-temperature heat pump system according to claim 1, characterized in that, The auxiliary branch includes a first auxiliary branch, the two ends of which are respectively connected to the water source and the first connection port of the first heat exchanger. The auxiliary branch includes a second auxiliary branch, the two ends of which are respectively connected to the second connection port of the first heat exchanger and the first connection port of the second heat exchanger. The auxiliary branch includes a third auxiliary branch, the two ends of which are respectively connected to the second connection port of the second heat exchanger and the user side.

3. The low temperature heat pump system of claim 2, wherein, The second auxiliary branch is equipped with a first solenoid valve.

4. The low temperature heat pump system of claim 3, wherein, The auxiliary branch includes a fourth auxiliary branch, the two ends of which are connected to the second auxiliary branch and the user side, respectively, and the fourth auxiliary branch is connected between the first solenoid valve and the first heat exchanger; the fourth auxiliary branch is provided with a second solenoid valve.

5. The low-temperature heat pump system according to claim 1, characterized in that, The low-temperature heat pump system also includes a four-way valve, a third heat exchanger, a fourth heat exchanger, and a gas-liquid separator.

6. The low temperature heat pump system of claim 5, wherein, The four-way valve has a first opening, a second opening, a third opening, and a fourth opening; inside the four-way valve, the first opening can communicate with the second opening, the second opening can communicate with the third opening, the third opening can communicate with the fourth opening, and the fourth opening can communicate with the first opening.

7. The low temperature heat pump system of claim 6, wherein, The main circuit includes a first branch and a second branch. The outlet of the compressor is connected to the first opening through the first branch. The second opening is connected to the first connection port of the third heat exchanger through the second branch.

8. The low-temperature heat pump system according to claim 7, characterized in that, The main circuit includes a third branch, and the second connection port of the third heat exchanger is connected to the first connection port of the fourth heat exchanger through the third branch; The main circuit includes a fourth branch, and the second connection port of the fourth heat exchanger is connected to the third connection port of the first heat exchanger through the fourth branch.

9. The low-temperature heat pump system according to claim 8, characterized in that, The main circuit includes a fifth branch, and the fourth connection port of the first heat exchanger is connected to the third connection port of the second heat exchanger through the fifth branch. The main circuit includes a sixth branch, and the fourth connection port of the second heat exchanger is connected to the fourth opening through the sixth branch; The main circuit includes a seventh branch, and the third opening is connected to the first inlet of the compressor through the seventh branch. The gas-liquid separator is installed in the seventh branch.

10. The low-temperature heat pump system according to claim 9, characterized in that, The main circuit includes an eighth branch, the two ends of which are respectively connected to the third branch and the third connection port of the fourth heat exchanger; The main circuit includes a ninth branch, the two ends of which are connected to the fourth connection port of the fourth heat exchanger and the second inlet of the compressor, respectively.

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