Heat pump unit and heat energy utilization system

Abstract

The embodiments of the present application provide a heat pump unit and a heat energy utilization system. The heat pump unit includes a compression device, a condenser, a first throttling element, an evaporator and a first heat exchanger. The compression device, the condenser, the first throttling element and the evaporator are connected through a refrigerant pipeline to form a refrigerant circulation loop, and the condenser is used to use the refrigerant to heat the first heat exchange medium. The hot side inlet and the hot side outlet of the first heat exchanger are respectively connected to the lubricating medium inlet and the lubricating medium outlet of the compression device, and the cold side inlet and the cold side outlet of the first heat exchanger are respectively connected to the refrigerant circulation loop, and the first heat exchanger is used to use the refrigerant in the refrigerant circulation loop to cool down the lubricating medium of the compressor. In this way, it is beneficial to improve the energy efficiency ratio and heating temperature of the heat pump system.

Description

Technical Field

[0001] The exemplary embodiments of the present application generally relate to the field of heat pumps, and in particular to a heat pump unit and a thermal energy utilization system. Background Art

[0002] Heat pumps (HP) are used to convert low-quality heat energy into high-quality heat energy to achieve efficient use of heat energy. Conventional heat pumps usually include a compression refrigeration system consisting of a compressor, condenser, throttling element, and evaporator. The refrigerant circulates in the compression refrigeration system to achieve the conversion and transfer of heat energy. However, the energy efficiency and heating temperature of conventional heat pumps still need to be improved. Utility Model Content

[0003] The purpose of the present application is to provide a heat pump unit and a heat energy utilization system to solve or at least partially solve the above-mentioned problems and / or other potential problems existing in traditional heat pump units.

[0004] In a first aspect of the present application, a heat pump unit is provided. The heat pump unit includes a compressor, a condenser, a first throttling element, an evaporator and a first heat exchanger;

[0005] The compressor, the condenser, the first throttling element and the evaporator are connected through a refrigerant pipeline to form a refrigerant circulation loop, and the condenser is used to heat the first heat exchange medium using the refrigerant;

[0006] The hot side inlet and hot side outlet of the first heat exchanger are respectively connected to the lubricating medium outlet and lubricating medium inlet of the compressor, and the cold side inlet and cold side outlet of the first heat exchanger are respectively connected to the refrigerant circulation loop. The first heat exchanger is used to cool the lubricating medium of the compressor using the refrigerant in the refrigerant circulation loop.

[0007] In some embodiments, the heat pump unit further includes an economizer and a second throttling element, the cold side inlet of the economizer is connected to the hot side outlet of the condenser through the second throttling element, and the hot side outlet of the economizer is connected to the inlet of the first throttling element;

[0008] The economizer is used to cool down the refrigerant in its hot side channel by using the refrigerant in its cold side channel, and transmit the cooled refrigerant to the first throttling element.

[0009] In some embodiments, the cold side inlet of the first heat exchanger is connected to the cold side outlet of the economizer, and the cold side outlet of the first heat exchanger is connected to the hot side inlet of the economizer.

[0010] In some embodiments, the hot side inlet of the economizer is connected to the hot side outlet of the condenser, the cold side inlet of the first heat exchanger is connected to the cold side outlet of the economizer, and the cold side outlet of the first heat exchanger is connected to the air supply port of the compressor.

[0011] In some embodiments, the first heat exchanger includes a first flow channel, a second flow channel and a third flow channel capable of performing heat exchange; the inlet and outlet of the first flow channel are respectively connected to the condenser and the first throttling element; the inlet of the second flow channel is connected to the condenser through the second throttling element, and the outlet of the second flow channel is connected to the air supply port of the compressor; the inlet and outlet of the third flow channel are respectively connected to the lubrication port outlet and the lubrication medium inlet of the compressor.

[0012] In some embodiments, the heat pump unit also includes a second heat exchanger, the hot side inlet and the hot side outlet of the second heat exchanger are respectively connected to the hot side outlet of the condenser and the inlet of the first throttling element; the second heat exchanger is constructed to cool the refrigerant in its hot side channel by using the second heat exchange medium flowing through its cold side channel.

[0013] In some embodiments, the compressor is a screw compressor.

[0014] In some embodiments, the compressor and the first heat exchanger are of an integrated structure.

[0015] In a second aspect of the present application, a heat energy utilization system is provided. The heat energy utilization system comprises the above heat pump unit, as well as a heat-using device and a heat source device; the heat-using device is respectively connected to the cold side inlet and the cold side outlet of the condenser in the heat pump unit to form a circulation loop of a first heat exchange medium; the heat source device is respectively connected to the hot side inlet and the hot side outlet of the evaporator to form a circulation loop of a second heat exchange medium.

[0016] In some embodiments, it also includes: a first medium pump and / or a second medium pump, the first medium pump is connected between the heat-using device and the cold side inlet of the condenser; the second medium pump is connected between the heat source device and the hot side inlet of the evaporator.

[0017] The heat pump unit of the embodiment of the present application can not only reduce the temperature of the lubricating medium and maintain the working efficiency and stability of the compression device, but also recover heat into the refrigerant circulation loop, which is beneficial to maintain the heat contained in the refrigerant circulation loop and avoid the ineffective dissipation of heat to the outside of the system, thereby helping to improve the energy efficiency ratio of the heat pump unit and the heating temperature of the first heat exchange medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0019] Figure 1 A schematic diagram of a heat pump unit according to a first embodiment of the present application is shown;

[0020] Figure 2 shows a schematic diagram of a heat pump unit according to a second embodiment of the present application;

[0021] Figure 3 A schematic diagram of a heat pump unit according to a third embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram of a heat pump unit according to a fourth embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram of a heat energy utilization system according to a first embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram showing a heat energy utilization system according to a second embodiment of the present application; and

[0025] Figure 7 A schematic diagram of a heat energy utilization system according to a third embodiment of the present application is shown.

[0026] Description of reference numerals:

[0027] 11-compressor; 12-condenser; 13-first throttling element; 14-evaporator; 15-first heat exchanger; 16-economizer; 17-second throttling element; 18-heat source equipment; 19-second medium pump; 20-second heat exchanger; 21-third medium pump; 22-heat-using equipment; 23-first medium pump; 24-drying filter; 25-stop valve; 26, 27, 28-solenoid valves. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0029] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects.

[0030] The embodiment of the present application provides a heat pump unit, Figure 1 A schematic diagram of a heat pump unit according to a first embodiment of the present application is shown, see Figure 1 As shown, the heat pump unit of the embodiment of the present application includes a compressor 11, a condenser 12, a first throttling element 13, an evaporator 14 and a first heat exchanger 15.

[0031] The compressor 11, the condenser 12, the first throttling element 13 and the evaporator 14 are connected through a refrigerant pipeline to form a refrigerant circulation loop. The condenser 12 is used to heat the first heat exchange medium using the refrigerant.

[0032] Specifically, the compressor 11 may have a refrigerant inlet, a refrigerant outlet, an air supply port, a lubricating medium inlet and a lubricating medium outlet. The refrigerant outlet of the compressor 11 may be connected to the hot side inlet of the condenser 12 through a refrigerant pipeline, the hot side outlet of the condenser 12 may be connected to the inlet of the first throttling element 13 through a refrigerant pipeline, and the cold side inlet and the cold side outlet of the condenser 12 may be respectively connected to the medium delivery pipeline for delivering the first heat exchange medium. The compressor 11 is used to compress the gaseous refrigerant, increase the pressure and temperature of the gaseous refrigerant, and form a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant is delivered to the hot side channel of the condenser 12, and heat exchanges with the first heat exchange medium flowing through the cold side channel of the condenser 12, thereby increasing the temperature of the first heat exchange medium to form a high-grade heat source for use. At the same time, the high-temperature and high-pressure gaseous refrigerant is converted into a medium-temperature and high-pressure liquid refrigerant and delivered to the first throttling element 13.

[0033] Alternatively or additionally, the compressor 11 may include a screw compressor, such as an oil-lubricated screw compressor, a water-lubricated screw compressor, a dry screw compressor, etc. Of course, the above compressor 11 is only exemplary, and in actual application, various known or unknown screw compressors can be flexibly selected according to actual needs.

[0034] The outlet of the first throttling element 13 can be connected to the cold side inlet of the evaporator 14 through a refrigerant pipeline. The first throttling element 13 can be used to throttle and cool the medium-temperature and high-pressure liquid refrigerant to form a cold side channel for the low-temperature and low-pressure liquid refrigerant to enter the evaporator 14.

[0035] The cold side outlet of the evaporator 14 can be connected to the refrigerant inlet of the compressor 11 through a refrigerant pipeline. Alternatively or additionally, the evaporator 14 can have a hot side channel capable of heat exchange with the cold side channel, and the hot side inlet and hot side outlet of the evaporator 14 can be respectively connected to a medium delivery pipeline for delivering a second heat exchange medium. The low-temperature and low-pressure liquid refrigerant can perform heat exchange with the second heat exchange medium, and the low-temperature and low-pressure liquid refrigerant transfers cold energy to the second heat exchange medium and absorbs heat from the second heat exchange medium to form a low-pressure and medium-temperature gaseous refrigerant that flows back to the compressor 11, completing the refrigerant cycle.

[0036] Alternatively or additionally, the evaporator 14 may not have a hot side channel. For example, the evaporator 14 may be equipped with a fan or a blower for guiding airflow through the evaporator 14, and the low-temperature and low-pressure liquid refrigerant may also exchange heat with the air and absorb heat from the air.

[0037] The first heat exchange medium and the second heat exchange medium can be selected from various suitable gaseous or liquid heat transfer media according to actual needs. For example, the first heat exchange medium and the second heat exchange medium can both be water. Alternatively, the first heat exchange medium can be heat transfer oil, and the second heat exchange medium can be water, etc.

[0038] The hot side inlet and the hot side outlet of the first heat exchanger 15 are respectively connected to the lubricating medium outlet and the lubricating medium inlet of the compressor 11, and the cold side inlet and the cold side outlet of the first heat exchanger 15 are respectively connected to the refrigerant circulation circuit. The first heat exchanger 15 is used to use the refrigerant in the refrigerant circulation circuit to cool down the lubricating medium of the compressor 11. The lubricating medium here may include various media that can lubricate the compressor 11, such as lubricating oil and water.

[0039] Specifically, the lubricating medium of the compressor 11 is delivered to the hot side channel of the first heat exchanger 15, and the refrigerant in the refrigerant circulation loop can be delivered to the cold side channel of the first heat exchanger 15. The refrigerant can transfer cold energy to the lubricating medium to reduce the temperature of the lubricating medium. The refrigerant can also absorb heat from the lubricating medium and carry the absorbed heat back to the refrigerant circulation loop.

[0040] In this way, not only can the temperature of the lubricating medium be reduced and the working efficiency and stability of the compressor 11 be maintained, but the heat can also be recovered into the refrigerant circulation loop, which is beneficial to maintaining the heat contained in the refrigerant circulation loop and avoiding the ineffective dissipation of heat to the outside of the system or causing the compression device 11 to shut down due to internal overheating, thereby helping to improve the energy efficiency ratio and heating temperature of the heat pump unit.

[0041] It should be understood that the cold side inlet of the first heat exchanger 15 can be connected to any position on the refrigerant circulation circuit that can receive refrigerant from the refrigerant circulation circuit and can use the received refrigerant to cool the lubricating medium. The cold side outlet of the first heat exchanger 15 can be connected to any position on the refrigerant circulation circuit that is suitable for transporting the refrigerant after absorbing heat back to the refrigerant circulation circuit. The connection position and connection method of the cold side inlet and the cold side outlet of the first heat exchanger 15 are not limited here. The connection position and connection method of the cold side inlet and the cold side outlet of the first heat exchanger 15 and the refrigerant circulation circuit will be exemplified in combination with the drawings and specific embodiments later.

[0042] Alternatively or additionally, the compressor 11 and the first heat exchanger 15 may adopt an integrated structure. For example, the compressor 11 and the first heat exchanger 15 may be assembled into an integral structure, and the integral structure may have an integrated appearance. For another example, the first heat exchanger 15 may be arranged inside the shell of the compressor 11 or adjacently communicated. Alternatively or additionally, the compressor 11 and the first heat exchanger 15 may also adopt a split structure. For example, the compressor 11 and the first heat exchanger 15 may be connected via an oil pipeline.

[0043] In some embodiments, the heat pump unit may further include an economizer 16 and a second throttling element 17, wherein the cold side inlet of the economizer 16 is connected to the condenser 12 through the second throttling element 17, and the hot side outlet of the economizer 16 is connected to the inlet of the first throttling element 13. The second throttling element 17 can throttle and cool at least part of the refrigerant output by the condenser 12 to reduce the temperature and pressure of at least part of the refrigerant. The at least part of the refrigerant can flow into the cold side channel of the economizer 16, and the economizer 16 can use the at least part of the refrigerant to cool the refrigerant in the hot side channel of the economizer 16. Afterwards, the cooled refrigerant in the hot side channel of the economizer 16 is transported to the first throttling element 13, which can increase the coldness in the refrigerant output by the first throttling element 13, and can improve the heat absorption efficiency of the evaporator 14, thereby facilitating the increase of the heating temperature of the first heat exchange medium.

[0044] The following combination Figure 2 and Figure 3 The specific connection relationship between the economizer 16 and the first heat exchanger 15 is exemplarily described, but it should not be understood that the connection relationship between the economizer 16 and the first heat exchanger 15 is limited to the connection relationship shown below.

[0045] For example, Figure 2 As shown, Figure 2 A schematic diagram of a heat pump unit according to a second embodiment of the present application is shown. Figure 2 The second embodiment shown is relative to Figure 1 The difference of the first embodiment shown mainly lies in the addition of an economizer 16 and a second throttling element 17 , as well as the connection structure between the condenser 12 , the second throttling element 17 , the economizer 16 , the first throttling element 13 and the first heat exchanger 15 .

[0046] Specifically, if Figure 2 As shown, the cold side inlet of the economizer 16 can be connected to the hot side outlet of the condenser 12 through the second throttling element 17, and the cold side outlet of the economizer 16 can be connected to the cold side inlet of the first heat exchanger 15. The cold side outlet of the first heat exchanger 15 is connected to the hot side inlet of the economizer 16, and the cold side outlet of the economizer 16 can be connected to the first throttling element 13.

[0047] The refrigerant flowing out of the condenser 12 is first throttled and cooled by the second throttling element 17, and then flows into the cold side channel of the economizer 16. The first heat exchanger 15 can receive the refrigerant from the cold side channel of the economizer 16, and after cooling the lubricating medium with the refrigerant, the refrigerant after absorbing heat flows into the hot side channel of the economizer 16, and after heat exchange with the refrigerant in the cold side channel of the economizer 16, flows into the first throttling element 13. The pipeline structure is simple, which is conducive to simplifying the flow control logic of the refrigerant.

[0048] Alternatively or additionally, the first throttling element 13 and / or the second throttling element 17 may include but are not limited to an expansion valve, a throttling valve, a capillary tube, a venturi tube, an orifice plate, a nozzle, etc. For example, the first throttling element 13 may include a first expansion valve, and the second throttling element 17 may include a second expansion valve.

[0049] For example, Figure 3 As shown, Figure 3 A schematic diagram of a heat pump unit according to a third embodiment of the present application is shown. Figure 3 The third embodiment shown is relative to Figure 1 The difference of the first embodiment shown mainly lies in the addition of an economizer 16 and a second throttling element 17 , as well as the connection structure between the condenser 12 , the second throttling element 17 , the economizer 16 , the first throttling element 13 , the first heat exchanger 15 and the compressor 11 .

[0050] Specifically, if Figure 3 As shown, the hot side outlet of the condenser 12 can be connected to two refrigerant branches respectively, and the hot side outlet of the condenser 12 is connected to the inlet of the second throttling element 17 through one refrigerant branch, and the outlet of the second throttling element 17 is connected to the cold side inlet of the economizer 16. The hot side outlet of the condenser 12 is connected to the hot side inlet of the economizer 16 through another refrigerant branch.

[0051] The refrigerant flowing out of the hot side channel of the condenser 12 is divided into two streams, one of which flows into the cold side channel of the economizer 16 after being throttled and cooled by the second throttling element 17, and the other stream of refrigerant flows directly into the hot side channel of the economizer 16. The economizer 16 uses the one stream of refrigerant to cool down the other stream of refrigerant. The other stream of refrigerant flows into the first throttling element 13 after being cooled down.

[0052] The cold side inlet of the first heat exchanger 15 is connected to the cold side outlet of the economizer 16, and the cold side outlet of the first heat exchanger 15 is connected to the air supply port of the compressor 11. A stream of refrigerant flowing out of the cold side channel of the economizer 16 flows into the cold side channel of the second heat exchanger 20 to cool the lubricating medium. Afterwards, the stream of refrigerant flows back to the refrigerant circulation loop through the air supply port of the compressor 11. In this way, after absorbing heat from the other refrigerant and the lubricating medium, the stream of refrigerant does not flow through the first throttling element 13 and the evaporator 14, which is beneficial for the other refrigerant to maintain a relatively low temperature, thereby improving the heat exchange efficiency of the evaporator 14.

[0053] like Figure 4 As shown, Figure 4 A schematic diagram of a heat pump unit according to a fourth embodiment of the present application is shown. Figure 4 The fourth embodiment shown is relative to Figure 1 The difference of the first embodiment shown mainly lies in the addition of a second throttling element 17 and the connection structure between the condenser 12 , the second throttling element 17 , the first heat exchanger 15 , the first throttling element 13 and the compressor 11 .

[0054] Figure 4 The fourth embodiment shown is similar to Figure 3 Similar to the third embodiment shown, the hot side outlet of the condenser 12 can be connected to two refrigerant branches respectively, and the hot side outlet of the condenser 12 is connected to the inlet of the second throttling element 17 through one refrigerant branch. Figure 3 The difference from the third embodiment shown is that the first heat exchanger 15 in this fourth embodiment includes a first flow channel, a second flow channel and a third flow channel capable of heat exchange, that is, in this example, the first heat exchanger 15 is a three-flow channel heat exchanger.

[0055] The hot side outlet of the condenser 12 is connected to the inlet of the first flow channel of the first heat exchanger 15 through another refrigerant branch, and the outlet of the first flow channel is connected to the first throttling element 13. The outlet of the second throttling element 17 is connected to the inlet of the second flow channel, and the outlet of the second flow channel is connected to the air supply port of the compressor 11. The inlet of the third flow channel is connected to the lubricating medium outlet of the compressor 11, and the outlet of the third flow channel is connected to the lubricating medium inlet of the compressor 11.

[0056] The refrigerant flowing out of the hot side channel of the condenser 12 is divided into two streams. One stream of refrigerant flows into the second throttling element 17 through the refrigerant branch, and flows into the second flow channel of the first heat exchanger 15 after throttling and cooling by the second throttling element 17. The other stream of refrigerant directly flows into the first flow channel of the first heat exchanger 15. At the same time, the lubricating medium flowing out of the compressor 11 flows into the third flow channel of the first heat exchanger 15. The two streams of refrigerant and the one stream of lubricating medium are heat exchanged synchronously in the first heat exchanger 15. The one stream of refrigerant with a lower temperature absorbs heat from the other stream of refrigerant and the lubricating medium respectively. The purpose of cooling the other stream of refrigerant and the lubricating medium is achieved through the first heat exchanger 15 at the same time, which is conducive to simplifying the system structure and reducing production costs.

[0057] In some embodiments, the heat pump unit may further include a second heat exchanger 20, the hot side inlet of the second heat exchanger 20 is connected to the hot side outlet of the condenser 12, and the hot side outlet of the second heat exchanger 20 is connected to the inlet of the first throttling element 13. The second heat exchanger 20 is configured to cool the refrigerant in its hot side channel using the second heat exchange medium flowing through its cold side channel. In this way, at least part of the refrigerant can flow into the second heat exchanger 20 before flowing into the first throttling element 13, and be cooled by the second heat exchange medium in the second heat exchanger 12, which can reduce the inlet temperature of the first throttling element 13, and further reduce the temperature of the refrigerant transported from the first throttling element 13 to the evaporator 14, which is beneficial to improve the heat exchange efficiency of the evaporator 14, and further beneficial to improve the energy efficiency ratio of the heat pump system.

[0058] In some embodiments, the heat pump unit may further include a filter drier 24, and the hot side outlet of the condenser 12 may be connected to the inlet of the first throttling element 13 through the filter drier 24. In this way, the refrigerant flowing out of the hot side channel of the condenser 12 flows through the filter drier 24 to remove moisture and impurities, which is conducive to maintaining the quality of the refrigerant, delaying the replacement cycle of the refrigerant, and thus helping to reduce the use cost of the heat pump unit.

[0059] The present application also provides a heat energy utilization system. Figure 5 As shown, the heat energy utilization system includes the heat pump unit described in any of the above embodiments, as well as a heat-using device 22 and a heat source device 18. The heat-using device 22 is respectively connected to the cold side inlet and the cold side outlet of the condenser 12 in the heat pump unit to form a first heat exchange medium circulation loop. The heat source device 18 is respectively connected to the hot side inlet and the hot side outlet of the evaporator 14 to form a second heat exchange medium circulation loop.

[0060] In the evaporator 14, the low-temperature and low-pressure liquid refrigerant absorbs heat energy from the second heat exchange medium, is converted into a low-temperature and low-pressure gaseous refrigerant, and then flows into the compressor 11. After being compressed by the compressor 11, a high-temperature and high-pressure gaseous refrigerant is formed, which flows into the condenser 12. In the condenser 12, the first heat exchange medium absorbs heat energy from other high-temperature and high-pressure refrigerants, flows into the heat-using equipment through the first heat exchange medium circulation loop, and provides heat energy for the heat-using equipment. Since the above-mentioned heat pump unit has a high energy efficiency ratio, the heat energy utilization system using the above-mentioned heat pump unit also has a high energy efficiency ratio, and can output the first heat exchange medium with a relatively high temperature.

[0061] In practical applications, various devices that need to utilize thermal energy and devices that can generate thermal energy can be flexibly selected as the heat-using device 22 and the heat source device 18, respectively.

[0062] In some embodiments, the heat energy utilization system may further include a first medium pump 23 and / or a second medium pump 19. The first medium pump 23 is disposed in the first heat exchange medium circulation loop, and is used to provide power for the flow of the first heat exchange medium. The second medium pump 19 is disposed in the second heat exchange medium circulation loop, and is used to provide power for the flow of the second heat exchange medium.

[0063] Alternatively or additionally, the first medium pump 23 may be connected between the heat-using device 22 and the cold side inlet of the condenser 12. Obviously, the first medium pump 23 may also be arranged between the cold side outlet of the condenser 12 and the heat-using device 22, or may also be arranged at other positions of the first heat exchange medium circulation loop, as long as it can provide power for the first heat exchange medium flowing through the first heat exchange medium circulation loop. The type of the first medium pump 23 may be flexibly selected according to actual needs, and the type of the first medium pump 23 is not limited here.

[0064] Alternatively or additionally, the second medium pump 19 may be connected between the heat source device 18 and the hot side inlet of the evaporator 14. Obviously, the second medium pump 19 may also be connected between the hot side outlet of the evaporator 14 and the heat source device 18, or the second medium pump 19 may also be arranged at other positions of the second heat exchange medium circulation loop, as long as it can provide power for the second heat exchange medium to flow in the second heat exchange medium circulation loop. The type of the second medium pump 19 can be flexibly selected according to actual needs, and the type of the second medium pump 19 is not limited here.

[0065] The following combination Figures 5 to 7 The specific structure and connection relationship of the heat energy utilization equipment are exemplified, but it should not be understood that the heat energy utilization equipment is limited to the connection relationship shown below.

[0066] For example, Figure 5 As shown, Figure 5A schematic diagram of a heat energy utilization system according to a first embodiment of the present application is shown. Figure 5 The heat pump unit used in the example shown is Figure 2 The heat pump units shown are similar. Figure 2 The specific connection relationship has been reflected in the example shown, so it will not be repeated here. Figure 5 The examples shown include Figure 2 The structures and connection relationships not shown in the figure are introduced as examples.

[0067] Figure 5 The examples shown are similar to Figure 2 One difference of the example shown is that the hot side outlet of the condenser 12 is connected to the inlet of the filter drier 24 via a stop valve 25, the outlet of the filter drier 24 is connected to the inlet of the second throttling element 17 via a solenoid valve 26, and the outlet of the filter drier 24 is also connected to the hot side inlet of the second heat exchanger 20 via a solenoid valve 27. The hot side outlet of the second heat exchanger 20 can be connected to the inlet of the first throttling element 13. The cold side inlet of the second heat exchanger 20 can be connected to the outlet of the second medium pump 19, and the cold side outlet of the second heat exchanger 20 can be connected to the inlet of the second medium pump 19 via a third medium pump 21.

[0068] The refrigerant flowing out of the hot side outlet of the condenser 12 first flows through the drying filter 24. The drying filter 24 can dry and filter the refrigerant flowing out of the hot side channel of the condenser 12 to remove moisture and impurities in the refrigerant, which is beneficial to maintaining the quality of the refrigerant and the energy efficiency ratio of the heat pump system.

[0069] The refrigerant flowing out of the drying filter 24 is divided into two streams, one stream of refrigerant flows through the solenoid valve 26, the second throttling element 17, the economizer 16 and the first heat exchanger 15, and the other stream of refrigerant flows into the hot side channel of the second heat exchanger 20 through the solenoid valve 27. In the second heat exchanger 20, the other stream of refrigerant exchanges heat with the second heat exchange medium (for example, medium-temperature water), absorbs cold from the second heat exchange medium and transfers heat to the second heat exchange medium. After that, the other stream of refrigerant flows out through the hot side outlet of the second heat exchanger 20. The two streams of refrigerant merge at the first throttling element 13 and flow into the first throttling element 13. After throttling and cooling through the first throttling element 13, they flow into the cold side channel of the evaporator 14.

[0070] The second heat exchange medium flowing out of the cold side channel of the second heat exchanger 20 is mixed with the second heat exchange medium transported by the heat source device 18, and then flows into the hot side channel of the evaporator 14. The second heat exchange medium and the refrigerant after throttling and cooling are heat exchanged in the evaporator 14 to achieve the purpose of absorbing heat from the heat source device 18. In the improved scheme of this example, the second heat exchange medium and the refrigerant are heat exchanged in advance by the second heat exchanger 20, which can increase the heat energy contained in the second heat exchange medium and the cold energy contained in the refrigerant, which is beneficial to improve the heat exchange efficiency of the evaporator 14, and then to improve the energy efficiency ratio of the heat pump system, and to increase the heating temperature of the first heat exchange medium.

[0071] Figure 5 The examples shown are similar to Figure 2 Another difference of the example shown is that the heat pump system also includes a heat-using device 22 and a first medium pump 23. The cold side inlet and the cold side outlet of the condenser 12 are respectively connected to the heat-using device 22 to form a first heat exchange medium circulation loop, and the first medium pump 23 is arranged on the first heat exchange medium circulation loop. In this way, the heat pump system can absorb heat from the heat source device 18, transfer and transform the absorbed heat, and transfer it to the heat-using device 22 through the first heat exchange medium (such as water). Conversely, the heat pump system also absorbs cold energy from the heat-using device 22, transfers and transforms the cold energy, and transfers it to the heat source device 18 through the second heat exchange medium (such as water), and cools the heat source device 18, for example, to achieve two-way regulation of cold energy and heat.

[0072] like Figure 6 As shown, Figure 6 A schematic diagram of a heat energy utilization system according to a second embodiment of the present application is shown. Figure 6 The heat pump unit used in the example shown is Figure 3 The heat pump units shown are similar, but Figure 6 The sixth embodiment shown is Figure 3One difference of the third embodiment shown is that the hot side outlet of the condenser 12 is divided into three refrigerant branches, one refrigerant branch is connected to the inlet of the second throttling element 17 through the solenoid valve 26, another refrigerant branch is connected to the hot side inlet of the economizer 16 through the solenoid valve 28, and another refrigerant branch is connected to the hot side inlet of the second heat exchanger 20 through the solenoid valve 27. The refrigerant flowing out of the hot side outlet of the second heat exchanger 20 and the refrigerant flowing out of the hot side outlet of the economizer 16 merge at the first throttling element 13. In this way, one of the three refrigerants absorbs heat from the other refrigerant and the lubricating medium and flows back to the compressor 11. Another refrigerant absorbs cold energy and merges into the first throttling element 13. Another refrigerant absorbs cold energy from the second heat exchange medium through the second heat exchanger 20 and merges into the first throttling element 13, which is beneficial to improving the heat exchange efficiency of the evaporator 14, and further to improving the energy efficiency ratio of the heat pump system.

[0073] certainly, Figure 6 The example shown is similar to Figure 3 The difference of the example shown in the figure also includes the addition of a heat source device 18 and a heat using device 22, etc., but the structure and connection relationship of the heat source device 18 and the heat using device 22 are the same as those of the example shown in the figure. Figure 5 The examples shown are similar to those described above. Figure 5 This is introduced in the example shown and will not be repeated here. Please refer to the previous introduction.

[0074] like Figure 7 As shown, Figure 7 A schematic diagram of a heat energy utilization system according to a third embodiment of the present application is shown. Figure 7 The heat pump unit used in the example shown is Figure 4 The heat pump units shown are similar, but Figure 7 The seventh embodiment shown is Figure 4 A difference of the fourth embodiment shown is that the hot side outlet of the condenser 12 is divided into three refrigerant branches, one refrigerant branch is connected to the inlet of the second throttling element 17 through the solenoid valve 26, another refrigerant branch is connected to the inlet of the first flow channel of the first heat exchanger 15 through the solenoid valve 28, and another refrigerant branch is connected to the hot side inlet of the second heat exchanger 20 through the solenoid valve 27. The connection mode of the second heat exchanger 20 with the first throttling element 13 and the second medium pump 19 is the same as that of the fourth embodiment shown. Figure 5 The examples shown and Figure 6 The examples shown are similar and will not be repeated here. For details, please refer to the above introduction.

[0075] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A heat pump unit, characterized in that: comprising a compressor, a condenser, a first throttling element, an evaporator and a first heat exchanger; The compressor, the condenser, the first throttling element and the evaporator are connected through a refrigerant pipeline to form a refrigerant circulation loop, and the condenser is used to heat the first heat exchange medium using the refrigerant; The hot side inlet and hot side outlet of the first heat exchanger are respectively connected to the lubricating medium outlet and lubricating medium inlet of the compressor, and the cold side inlet and cold side outlet of the first heat exchanger are respectively connected to the refrigerant circulation circuit. The first heat exchanger is used to cool the lubricating medium of the compressor using the refrigerant in the refrigerant circulation circuit.

2. The heat pump unit according to claim 1, characterized in that: The heat pump unit further comprises an economizer and a second throttling element, wherein the cold side inlet of the economizer is connected to the hot side outlet of the condenser through the second throttling element, and the hot side outlet of the economizer is connected to the inlet of the first throttling element; The economizer is used to cool down the refrigerant in its hot side channel by using the refrigerant in its cold side channel, and to deliver the cooled refrigerant to the first throttling element.

3. The heat pump unit according to claim 2, characterized in that: The cold side inlet of the first heat exchanger is connected to the cold side outlet of the economizer, and the cold side outlet of the first heat exchanger is connected to the hot side inlet of the economizer.

4. The heat pump unit according to claim 2, characterized in that: The hot side inlet of the economizer is connected to the hot side outlet of the condenser, the cold side inlet of the first heat exchanger is connected to the cold side outlet of the economizer, and the cold side outlet of the first heat exchanger is connected to the air supply port of the compressor.

5. The heat pump unit according to claim 1, characterized in that: The first heat exchanger includes a first flow channel, a second flow channel and a third flow channel capable of performing heat exchange; the inlet and outlet of the first flow channel are respectively connected to the condenser and the first throttling element; the inlet of the second flow channel is connected to the condenser through the second throttling element, and the outlet of the second flow channel is connected to the air supply port of the compressor; the inlet and outlet of the third flow channel are respectively connected to the lubrication port outlet and the lubrication medium inlet of the compressor.

6. The heat pump unit according to claim 1, characterized in that: The heat pump unit also includes a second heat exchanger, whose hot side inlet and hot side outlet are respectively connected to the hot side outlet of the condenser and the inlet of the first throttling element; the second heat exchanger is constructed to cool the refrigerant in its hot side channel by using the second heat exchange medium flowing through its cold side channel.

7. The heat pump unit according to claim 1, characterized in that: The compressor is a screw compressor.

8. The heat pump unit according to claim 1, characterized in that: The compressor and the first heat exchanger adopt an integrated structure.

9. A thermal energy utilization system, characterized in that: It comprises a heat pump unit as described in any one of claims 1 to 8, and a heat-using device and a heat source device; the heat-using device is respectively connected to the cold side inlet and the cold side outlet of the condenser in the heat pump unit to form a circulation loop of a first heat exchange medium; the heat source device is respectively connected to the hot side inlet and the hot side outlet of the evaporator to form a circulation loop of a second heat exchange medium.

10. The thermal energy utilization system according to claim 9, characterized in that: Also includes: a first medium pump and / or a second medium pump, wherein the first medium pump is connected between the heat-consuming device and a cold-side inlet of the condenser; The second medium pump is connected between the heat source device and the hot side inlet of the evaporator.

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