Heat pump system

Abstract

The application discloses a heat pump system, which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a geothermal heat exchanger, the indoor heat exchanger is used for heat exchange with a building circulating water system, and the geothermal heat exchanger is used for heat exchange with a geothermal system; wherein the heat pump system has a heat pump defrosting mode, in the heat pump defrosting mode, the geothermal heat exchanger outlet end is connected with the compressor inlet end, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the compressor outlet end and the geothermal heat exchanger inlet end to form a loop. The heat pump system of the embodiment of the application can stably supply heat to the indoor while defrosting, thereby ensuring the indoor temperature and improving the indoor comfort. Meanwhile, the heat pump system uses the heat in the geothermal system for defrosting, which can reduce the power consumption of the compressor, improve the energy efficiency ratio, ensure the stability of the defrosting effect, has better use effect and wider application range.

Description

Technical Field

[0001] This invention relates to the field of heating technology, and more particularly to a heat pump system. Background Technology

[0002] When an air source heat pump is operating in heating mode, frost will form on the surface of its outdoor heat exchanger when the surface temperature is below 0 degrees Celsius and below the dew point temperature of the outdoor air. The formation of frost reduces the airflow through the outdoor heat exchanger, increases the thermal resistance between the refrigerant and the outdoor air, and deteriorates the heat transfer process. This ultimately leads to adverse consequences such as a decrease in the unit's evaporation temperature, a reduction in heating capacity, and a decline in fan performance. Therefore, periodic defrosting of the outdoor heat exchanger of an air source heat pump unit is essential for improving its heating performance and stability in low-temperature and high-humidity environments.

[0003] In related technologies, hot gas defrosting is used to defrost outdoor heat exchangers. Hot gas defrosting utilizes the heat of a high-temperature gaseous working fluid inside the coils of the outdoor heat exchanger to melt the frost layer on the surface of the heat exchanger. It is one of the widely used hot gas defrosting methods. However, it requires heat to be drawn from the indoor environment during defrosting. After defrosting is completed and the system is switched back to heating mode, it cannot provide heating for a long time, resulting in large fluctuations in indoor ambient temperature and poor thermal comfort. Furthermore, the defrosting heat comes from the indoor environment and the compressor does a lot of work, which reduces the energy efficiency ratio of the heat pump. It may even cause low-pressure protection or wet compression, ultimately leading to the shutdown of the heat pump unit and damage to the compressor. There is room for improvement. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a heat pump system that can maintain indoor temperature, improve indoor comfort, reduce compressor power consumption, improve energy efficiency ratio, and ensure the stability of defrosting effect.

[0005] According to an embodiment of the present invention, a heat pump system includes: a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a geothermal heat exchanger. The indoor heat exchanger is used for heat exchange with a building circulating water system, and the geothermal heat exchanger is used for heat exchange with a geothermal system. The heat pump system has a heat pump defrosting mode, in which the outlet end of the geothermal heat exchanger is connected to the inlet end of the compressor, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the outlet end of the compressor and the inlet end of the geothermal heat exchanger to form a loop.

[0006] According to an embodiment of the present invention, the heat pump system is equipped with a geothermal system, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the outlet end of the compressor and the inlet end of the geothermal heat exchanger. This allows for stable indoor heating while defrosting, thereby ensuring indoor temperature and improving indoor comfort. At the same time, using the heat from the geothermal system for defrosting reduces the power consumption of the compressor, improves the energy efficiency ratio, and ensures the stability of the defrosting effect, resulting in better performance and a wider range of applications.

[0007] According to some embodiments of the heat pump system of the present invention, the heat pump system further has a first heat exchange mode and a second heat exchange mode. In the first heat exchange mode, the compressor, the outdoor heat exchanger, the geothermal heat exchanger and the indoor heat exchanger are connected in series to form a loop. In the second heat exchange mode, the compressor and the indoor heat exchanger are connected in series and the outdoor heat exchanger and the geothermal heat exchanger are connected in parallel between the indoor heat exchanger and the compressor to form a loop.

[0008] According to some embodiments of the heat pump system of the present invention, an economizer is further included, the economizer having a first side flow path and a second side flow path, the first side flow path being adapted to exchange heat with the second side flow path; in the heat pump defrosting mode, the first side flow path is connected in series between the indoor heat exchanger and the geothermal heat exchanger, and the second side flow path is connected in series between the outdoor heat exchanger and the inlet end of the first side flow path; in the second heat exchange mode, the first side flow path is connected in series between the indoor heat exchanger and the geothermal heat exchanger, and the second side flow path is connected in series between the indoor heat exchanger and the outdoor heat exchanger.

[0009] According to some embodiments of the heat pump system of the present invention, in the heat pump defrosting mode, the medium flow direction in the first side flow path is the same as the medium flow direction in the second side flow path; in the second heat exchange mode, the medium flow direction in the first side flow path is opposite to the medium flow direction in the second side flow path.

[0010] According to some embodiments of the heat pump system of the present invention, a first expansion valve and a second expansion valve are further included, the first expansion valve being disposed between the indoor heat exchanger and the first side flow path, and the second expansion valve being disposed between the outdoor heat exchanger and the second side flow path.

[0011] According to some embodiments of the heat pump system of the present invention, the first expansion valve and the second expansion valve are configured to be independently adjustable.

[0012] According to some embodiments of the heat pump system of the present invention, a four-way reversing valve is further provided with a first port, a second port, a third port, and a fourth port; wherein, in the heat pump defrosting mode, the first port and the third port are connected between the compressor and the indoor heat exchanger; in the second heat exchange mode, the first port and the third port are connected between the compressor and the indoor heat exchanger, and the second port and the fourth port are connected between the outdoor heat exchanger and the compressor; and in the first heat exchange mode, the first port and the second port are connected between the compressor and the outdoor heat exchanger, and the third port and the fourth port are connected between the indoor heat exchanger and the compressor.

[0013] According to some embodiments of the heat pump system of the present invention, the compressor is provided with a first connection port, a second connection port, and a third connection port; wherein, in the heat pump defrosting mode, the second connection port is connected to the geothermal heat exchanger and the first connection port is connected to the indoor heat exchanger and the outdoor heat exchanger; in the first heat exchange mode, the first connection port is connected to the outdoor heat exchanger and the second connection port is connected to the indoor heat exchanger; in the second heat exchange mode, the first connection port is connected to the indoor heat exchanger, the second connection port is connected to the outdoor heat exchanger, and the third connection port is connected to the geothermal heat exchanger.

[0014] According to some embodiments of the heat pump system of the present invention, a third expansion valve is further included, which is connected between the geothermal heat exchanger and the indoor heat exchanger in the first heat exchange mode.

[0015] According to some embodiments of the heat pump system of the present invention, an air-cooled fan is further included, the air-cooled fan being disposed at the outdoor heat exchanger and used to drive airflow toward the outdoor heat exchanger.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of a heat pump system according to an embodiment of the present invention.

[0019] Figure label:

[0020] Heat pump system 100,

[0021] Compressor 1, First connection port 11, Second connection port 12, Third connection port 13, Building circulating water system 2, First water pump 21, Indoor heat exchanger 22, Outdoor heat exchanger 3, Air-cooled fan 31, Geothermal system 4, Second water pump 41, Geothermal heat exchanger 42, Economizer 5, First side flow path 51, Inlet end of the first side flow path 511, First expansion valve 512, Second side flow path 52, Second expansion valve 521, Four-way reversing valve 6, First outlet 61, Second outlet 62, Third outlet 63, Fourth outlet 64, Third expansion valve 7, Three-way reversing valve 8, Solenoid shut-off valve 9, Electrically controlled proportional valve 10. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The following is for reference. Figure 1 The heat pump system 100 described according to an embodiment of the present invention can ensure indoor temperature, improve indoor comfort, reduce compressor 1 power consumption, improve energy efficiency ratio, and ensure the stability of defrosting effect.

[0026] like Figure 1 As shown, the heat pump system 100 according to an embodiment of the present invention includes: a compressor 1, an indoor heat exchanger 22, an outdoor heat exchanger 3, and a geothermal heat exchanger 42.

[0027] Indoor heat exchanger 22 is used for heat exchange with building circulating water system 2, and geothermal heat exchanger 42 is used for heat exchange with geothermal system 4. The heat pump system 100 has a heat pump defrosting mode. In the heat pump defrosting mode, the outlet end of geothermal heat exchanger 42 is connected to the inlet end of compressor 1, and indoor heat exchanger 22 and outdoor heat exchanger 3 are connected in parallel between the outlet end of compressor 1 and the inlet end of geothermal heat exchanger 42 to form a loop.

[0028] Heat pumps are a type of new energy source that can transfer low-temperature heat energy to high-temperature heat energy. This allows heat pumps to make extensive use of heat from natural resources and waste heat resources. The driving energy of heat pumps includes fuel energy, electrical energy, thermal energy, and mechanical energy, which can effectively save primary energy required for civil and industrial use and improve energy efficiency and environmental protection.

[0029] Specifically, the heat pump system 100 is equipped with a compressor 1, which can be supplied with low-temperature, low-pressure refrigerant gas. The compressor 1 is driven by an internal motor to compress the refrigerant gas and discharge high-temperature, high-pressure refrigerant gas to provide power for the refrigeration cycle. The heat pump system 100 is also equipped with an indoor heat exchanger 22, an outdoor heat exchanger 3, and a geothermal heat exchanger 42. One side of the indoor heat exchanger 22 is connected to the building circulating water system 2 and can be used for heat exchange with the building circulating water system 2. The building circulating water system 2 contains a working fluid, which is the working substance that realizes the conversion of heat and work. The building circulating water system 2 is connected to the building and can provide cooling or heating to the building by exchanging heat with the indoor heat exchanger 22, such as providing cooling for the building's air conditioning or heating for the building's heating system, to meet the user's needs. The building circulating water system 2 is equipped with a first water pump 21, which allows the heat exchange working fluid to flow in the building circulating water system 2 to provide uniform heating to the room.

[0030] Furthermore, one side of the geothermal heat exchanger 42 is connected to the geothermal system 4. The geothermal system 4 heats the entire ground evenly through the heat medium in the floor radiant layer. It can conduct heat from bottom to top by utilizing the heat storage of the ground itself and the upward radiation of heat, thus providing heating. The heat in the geothermal system 4 can be exchanged to the flow path of the heat pump system 100 through the geothermal heat exchanger 42, thereby enabling the heat pump system 100 to utilize the heat in the geothermal system 4 and reduce the energy consumption of the heat pump system 100. The geothermal system 4 also contains a working fluid, which can be the same type as the working fluid in the building circulating water system 2 or a different type of working fluid. The geothermal system 4 is equipped with a second water pump 41, which allows the working fluid to flow in the geothermal system 4 to continuously exchange heat with the geothermal heat exchanger 42.

[0031] Furthermore, the heat pump system 100 is equipped with a heat pump defrosting mode. When the heat pump system 100 is in heat pump defrosting mode, the outlet end of the geothermal heat exchanger 42 is connected to the inlet end of the compressor 1, meaning that the medium in the geothermal heat exchanger 42 after heat exchange with the geothermal system 4 can flow to the compressor 1. Additionally, the indoor heat exchanger 22 and the outdoor heat exchanger 3 are connected in parallel to the outlet end of the compressor 1, meaning that the medium compressed by the compressor 1 can flow to the indoor heat exchanger 22 and the outdoor heat exchanger 3 respectively. This medium has a higher temperature. When the medium flows to the indoor heat exchanger 22, it can exchange heat with the building circulating water system 2 through the indoor heat exchanger 22, thereby supplying heat to the building. The outdoor heat exchanger 3 is equipped with a coil, and the medium can flow into the coil of the outdoor heat exchanger 3. When the medium flows into the coil of the outdoor heat exchanger 3, it can heat up the outdoor heat exchanger 3. Then, when the ambient temperature is low and there is a frost layer on the outside of the outdoor heat exchanger 3, the frost layer is melted to defrost the outdoor heat exchanger 3.

[0032] Therefore, in the heat pump defrosting mode, the heat required to defrost the outdoor heat exchanger 3 comes from the geothermal system 4 and a small amount of work done by the compressor 1. It does not need to absorb indoor temperature, which reduces the operating power consumption of the compressor 1 and does not lower the indoor temperature, thus helping to ensure indoor comfort.

[0033] According to an embodiment of the present invention, the heat pump system 100 is equipped with a geothermal system 4, and the indoor heat exchanger 22 and the outdoor heat exchanger 3 are connected in parallel between the outlet end of the compressor 1 and the inlet end of the geothermal heat exchanger 42. This allows for stable indoor heating while defrosting, thereby ensuring indoor temperature and improving indoor comfort. At the same time, using the heat in the geothermal system 4 for defrosting reduces the power consumption of the compressor 1, improves the energy efficiency ratio, and ensures the stability of the defrosting effect, resulting in better performance and a wider range of applications.

[0034] In some embodiments, the heat pump system 100 further has a first heat exchange mode and a second heat exchange mode, in which the compressor 1, the outdoor heat exchanger 3, the geothermal heat exchanger 42 and the indoor heat exchanger 22 are connected in series to form a loop.

[0035] Specifically, the heat pump system 100 is also equipped with a first heat exchange mode and a second heat exchange mode. The first heat exchange mode can be set to a cooling mode. When the heat pump system 100 is in the first heat exchange mode, the compressor 1, the outdoor heat exchanger 3, the geothermal heat exchanger 42 and the indoor heat exchanger 22 are connected in series to form a loop. The working fluid absorbs heat in the building to reduce the building temperature and improve user comfort. The working fluid that has absorbed heat in the building circulating water system 2 can exchange heat with the medium in the heat pump system 100 through the indoor heat exchanger 22. After heat exchange, the medium is compressed by the compressor 1 to form a high-temperature and high-pressure gas. The high-temperature and high-pressure gas can be introduced into the outdoor heat exchanger 3 to exchange heat with the external environment to release heat to the external environment. The medium can also exchange heat with the geothermal system 4 through the geothermal heat exchanger 42 to realize the utilization of excess heat and save energy.

[0036] Furthermore, in the second heat exchange mode, compressor 1 is connected in series with indoor heat exchanger 22, and outdoor heat exchanger 3 is connected in parallel with geothermal heat exchanger 42 between indoor heat exchanger 22 and compressor 1 to form a loop. The second heat exchange mode can be set to a heating mode. When the heat pump system 100 is in the second heat exchange mode, compressor 1 is connected in series with indoor heat exchanger 22, and outdoor heat exchanger 3 is connected in parallel with geothermal heat exchanger 42 between indoor heat exchanger 22 and compressor 1 to form a loop. The working fluid can release heat into the building to raise the building temperature. The system provides high user comfort, and the working fluid released after heat release in the heat pump system 100 can flow to the outdoor heat exchanger 3 and the geothermal heat exchanger 42 respectively. The working fluid entering the geothermal heat exchanger 42 can absorb heat and exchange heat with the working fluid in the geothermal system 4. The working fluid after heat exchange is then fed into the compressor 1. The working fluid entering the outdoor heat exchanger 3 can absorb heat and can also be fed into the compressor 1. It can then be delivered to the indoor heat exchanger 22 through the compressor 1 to continue releasing heat into the building, ensuring indoor temperature and improving indoor comfort.

[0037] In some embodiments, the heat pump system 100 further includes an economizer 5, which has a first side flow path 51 and a second side flow path 52. The first side flow path 51 is adapted to exchange heat with the second side flow path 52. In the heat pump defrost mode, the first side flow path 51 is connected in series between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is connected in series between the outdoor heat exchanger 3 and the inlet end 511 of the first side flow path. In the second heat exchange mode, the first side flow path 51 is connected in series between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is connected in series between the indoor heat exchanger 22 and the outdoor heat exchanger 3.

[0038] Specifically, such as Figure 1As shown, the heat pump system 100 is also equipped with an economizer 5, which is used as a heat exchanger. It can absorb heat through the throttling evaporation of the medium itself, thereby subcooling another part of the medium. The economizer 5 has two flow paths inside, namely a first side flow path 51 and a second side flow path 52. The first side flow path 51 can exchange heat with the second side flow path 52. That is, when the heat of the medium in the first side flow path 51 is higher than the heat of the medium in the second side flow path 52, the medium in the first side flow path 51 can release heat to the medium in the second side flow path 52. When the heat of the medium in the second side flow path 52 is higher than the heat of the medium in the first side flow path 51, the medium in the second side flow path 52 can release heat to the medium in the first side flow path 51.

[0039] Furthermore, in the heat pump defrosting mode, the first side flow path 51 is connected in series between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is connected in series between the outdoor heat exchanger 3 and the inlet end 511 of the first side flow path. That is, after the medium releases heat in the indoor heat exchanger 22, it flows to the first side flow path 51 and then exchanges heat with the medium in the second side flow path 52. After heat exchange, the medium can be passed into the geothermal heat exchanger 42 to absorb heat and then pass into the compressor 1. The medium releases heat in the outdoor heat exchanger 3, causing the frost layer on the outdoor heat exchanger 3 to melt. After defrosting, the medium can flow to the second side flow path 52, exchange heat with the medium in the first side flow path 51, and then flow to the inlet end 511 of the first side flow path.

[0040] In the second heat exchange mode, the first side flow path 51 is connected in series between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is connected in series between the indoor heat exchanger 22 and the outdoor heat exchanger 3. That is, after the medium releases heat in the indoor heat exchanger 22, it flows to the first side flow path 51 and then exchanges heat with the medium in the second side flow path 52. The medium after heat exchange can be passed into the geothermal heat exchanger 42 to absorb heat and then pass into the compressor 1. The medium after releasing heat in the indoor heat exchanger 22 flows to the second side flow path 52 and then exchanges heat with the medium in the first side flow path 51. The medium after heat exchange can be passed to the outdoor heat exchanger 3, where it absorbs heat and then flows into the compressor 1. The heat exchange between the first side flow path 51 and the second side flow path 52 can utilize the waste heat of the medium, saving energy.

[0041] In some embodiments, in the heat pump defrosting mode, the medium flow direction in the first side flow path 51 is the same as the medium flow direction in the second side flow path 52, and in the second heat exchange mode, the medium flow direction in the first side flow path 51 is opposite to the medium flow direction in the second side flow path 52.

[0042] Specifically, in the heat pump defrosting mode, the flow direction of the medium in the first side flow path 51 is the same as that in the second side flow path 52. That is, in the heat pump defrosting mode, the first side flow path 51 is located between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is located between the outdoor heat exchanger 3 and the inlet end 511 of the first side flow path. A portion of the medium releases heat in the indoor heat exchanger 22 to supply heat to the building and then flows into the first side flow path 51. Another portion of the medium releases heat in the outdoor heat exchanger 3 to defrost the outdoor heat exchanger 3. The medium after defrosting still has excess heat and then flows into the second side flow path 52, so that the medium in the second side flow path 52 can release heat to the medium in the first side flow path 51. Setting the flow direction to be the same, that is, parallel heat flow, makes the heat distribution of the medium in the two flow paths uniform, and heat exchange begins when entering the economizer 5, improving the heat exchange effect.

[0043] In the second heat exchange mode, the flow direction of the medium in the first side flow path 51 is opposite to that in the second side flow path 52. That is, in the second heat exchange mode, the first side flow path 51 is set between the indoor heat exchanger 22 and the geothermal heat exchanger 42, and the second side flow path 52 is set between the indoor heat exchanger 22 and the outdoor heat exchanger 3. The medium releases heat in the indoor heat exchanger 22 to supply heat to the building. After releasing heat, part of the medium flows to the first side flow path 51 and the other part flows to the second side flow path 52. The medium in the second side flow path 52 can release heat to the medium in the first side flow path 51 and then flow to the outdoor heat exchanger 3 to absorb heat. After absorbing heat from the second side flow path 52, the medium in the first side flow path 51 continues to flow to the geothermal heat exchanger 42 to absorb heat and then flows directly to the compressor 1. By setting the flow direction to be opposite, that is, countercurrent heat transfer, the mixing degree of the medium temperature transfer in the two flow paths is high, which improves the heat exchange efficiency.

[0044] In some embodiments, the heat pump system 100 further includes a first expansion valve 512 and a second expansion valve 521, wherein the first expansion valve 512 is disposed between the indoor heat exchanger 22 and the first side flow path 51, and the second expansion valve 521 is disposed between the outdoor heat exchanger 3 and the second side flow path 52.

[0045] Specifically, such as Figure 1 As shown, the heat pump system 100 is also provided with a first expansion valve 512 and a second expansion valve 521. The first expansion valve 512 is located between the indoor heat exchanger 22 and the first side flow path 51. In the heat pump defrost mode, after the medium releases heat in the indoor heat exchanger 22, it can flow to the first expansion valve 512. After expanding through the first expansion valve 512, it can enter the economizer 5. In the second heat exchange mode, after the medium releases heat in the indoor heat exchanger 22, it can also flow to the first expansion valve 512. After expanding through the first expansion valve 512, it can enter the economizer 5.

[0046] Furthermore, the second expansion valve 521 is located between the outdoor heat exchanger 3 and the second side flow path 52. In the heat pump defrosting mode, after the medium releases heat in the outdoor heat exchanger 3, it can flow to the second expansion valve 521 and then enter the economizer 5. At this time, the second expansion valve 521 is fully open, and the medium flowing to the second side flow path 52 does not expand. The medium flowing to the first expansion valve 512 expands and then flows to the unexpanded medium in the first side flow path 51 and the second side flow path 52 for heat exchange, making full use of the excess heat in the medium and saving energy.

[0047] In the second heat exchange mode, after the medium releases heat in the indoor heat exchanger 22, it first flows to the economizer 5 and then flows through the second expansion valve 521. At this time, the medium in the first side flow path 51 has expanded through the first expansion valve 512 and can absorb the heat of the medium in the second side flow path 52. After absorbing the heat in the geothermal heat exchanger 42, the medium flows to the compressor 1, thereby improving the energy efficiency ratio of the compressor 1. At the same time, the medium in the second side flow path 52 can absorb heat at the outdoor heat exchanger 3, thereby increasing the enthalpy of this part of the medium before it is fed into the compressor 1.

[0048] In some embodiments, the first expansion valve 512 and the second expansion valve 521 are configured to be independently adjustable.

[0049] Specifically, a first expansion valve 512 is provided between the indoor heat exchanger 22 and the first side flow path 51, and a second expansion valve 521 is provided between the outdoor heat exchanger 3 and the second side flow path 52. The first expansion valve 512 and the second expansion valve 521 can be adjusted independently. That is, when the first expansion valve 512 expands the medium, the second expansion valve 521 can be fully opened, and when the second expansion valve 521 expands the medium, the first expansion valve 512 can be fully opened, or both expansion valves can be fully opened at the same time. Different opening degrees can also be adjusted according to needs. Different opening degrees of the two expansion valves result in different heat exchange between the medium in the first side flow path 51 and the medium in the second side flow path 52, thereby adjusting the thermal efficiency of the compressor 1 and improving the energy efficiency ratio.

[0050] In some embodiments, the heat pump system 100 further includes a four-way reversing valve 6, which has a first port 61, a second port 62, a third port 63 and a fourth port 64.

[0051] Specifically, such as Figure 1 As shown, the heat pump system 100 is equipped with a four-way reversing valve 6, and the four-way reversing valve 6 is provided with a first flow port 61, a second flow port 62, a third flow port 63 and a fourth flow port 64. The two adjacent flow ports can be connected to form multiple passages, which can reduce the number of pipes in the heat pump system 100 and reduce the installation cost.

[0052] In the heat pump defrosting mode, the first port 61 and the third port 63 are connected between the compressor 1 and the indoor heat exchanger 22. That is, after the medium is compressed by the compressor 1, it can flow to the four-way reversing valve 6, flow through the first port 61 to the third port 63, and then flow to the indoor heat exchanger 22 to release heat. The medium flowing out from the third port 63 can also flow to the outdoor heat exchanger 3 to release heat.

[0053] Furthermore, in the second heat exchange mode, the first port 61 and the third port 63 are connected between the compressor 1 and the indoor heat exchanger 22, and the second port 62 and the fourth port 64 are connected between the outdoor heat exchanger 3 and the compressor 1. That is, after the medium is compressed by the compressor 1, it can flow to the four-way reversing valve 6, flow through the first port 61 to the third port 63, and then flow to the indoor heat exchanger 22 to release heat. Part of the medium flows through the first side flow path 51 to the geothermal heat exchanger 42 to absorb heat, and then flows to the compressor 1. The other part flows through the second side flow path 52 to the outdoor heat exchanger 3 to absorb heat, and then flows to the four-way reversing valve 6, flow through the second port 62 to the fourth port 64, and then flows to the compressor 1.

[0054] In the first heat exchange mode, the first port 61 and the second port 62 are connected between the compressor 1 and the outdoor heat exchanger 3, and the third port 63 and the fourth port 64 are connected between the indoor heat exchanger 22 and the compressor 1. That is, after the medium is compressed by the compressor 1, it can flow to the four-way reversing valve 6, flow through the first port 61 to the second port 62, and then flow to the outdoor heat exchanger 3 and the geothermal heat exchanger 42 to release heat. Then it flows to the indoor heat exchanger 22 to absorb heat, and after absorbing heat, it can flow to the four-way reversing valve 6, flow through the third port 63 to the fourth port 64, and then flow to the compressor 1.

[0055] In some embodiments, the compressor 1 is provided with a first connection port 11, a second connection port 12 and a third connection port 13.

[0056] Specifically, such as Figure 1 As shown, the heat pump system 100 is equipped with a compressor 1, and the compressor 1 can perform work on the medium in the first heat exchange mode, the second heat exchange mode and the heat pump defrosting mode. The compressor 1 is provided with a first connection port 11, a second connection port 12 and a third connection port 13, so that the compressor 1 can be connected to multiple pipelines, simplifying the system piping and reducing the installation cost.

[0057] In the heat pump defrosting mode, the second connection port 12 is connected to the geothermal heat exchanger 42 and the first connection port 11 is connected to the indoor heat exchanger 22 and the outdoor heat exchanger 3. That is, after the medium is compressed by the compressor 1, it can flow through the first connection port 11 to the indoor heat exchanger 22 to release heat, and it can also flow to the outdoor heat exchanger 3 to release heat. After the medium absorbs heat in the geothermal heat exchanger 42, it can flow back to the compressor 1 through the second connection port 12 for compression.

[0058] Furthermore, in the first heat exchange mode, the first connection port 11 is connected to the outdoor heat exchanger 3 and the second connection port 12 is connected to the indoor heat exchanger 22. That is, after the medium is compressed by the compressor 1, it can flow through the first connection port 11 to the outdoor heat exchanger 3 to release heat. Then it can flow to the geothermal heat exchanger 42 to release heat, and then flow to the indoor heat exchanger 22 to absorb heat. After absorbing heat, it can flow back to the compressor 1 through the second connection port 12 for compression.

[0059] In the second heat exchange mode, the first connection port 11 is connected to the indoor heat exchanger 22, the second connection port 12 is connected to the outdoor heat exchanger 3, and the third connection port 13 is connected to the geothermal heat exchanger 42. That is, after the medium is compressed by the compressor 1, it can release heat through the first connection port 11 to the indoor heat exchanger 22. Part of the medium flows through the first side flow path 51 to the geothermal heat exchanger 42 to absorb heat, and then flows through the third connection port 13 to the compressor 1. The other part flows through the second side flow path 52 to the outdoor heat exchanger 3 to absorb heat, and then flows through the second connection port 12 to the compressor 1.

[0060] In some embodiments, the heat pump system 100 further includes a third expansion valve 7, which is connected between the geothermal heat exchanger 42 and the indoor heat exchanger 22 in the first heat exchange mode.

[0061] Specifically, such as Figure 1 As shown, the heat pump system 100 is also equipped with a third expansion valve 7. In the first heat exchange mode, the third expansion valve 7 is located between the geothermal heat exchanger 42 and the indoor heat exchanger 22. That is, the medium absorbs heat at the indoor heat exchanger 22 to cool the building. After absorbing heat, the medium flows to the compressor 1 to do work, and then flows to the outdoor heat exchanger 3. The medium can release heat at the outdoor heat exchanger 3 and then flow to the geothermal heat exchanger 42. After the geothermal heat exchanger 42 releases heat to the geothermal system 4, it flows to the third expansion valve 7. The third expansion valve 7 can throttle the medium to cool and depressurize it, so that the cooled and depressurized medium flows back to the indoor heat exchanger 22 to absorb heat from the building's circulating water system 2 to cool the building and improve user comfort.

[0062] Meanwhile, the heat pump system 100 is also equipped with a three-way reversing valve 8 and an electrically controlled proportional valve 10. In the second heat exchange mode, the three-way reversing valve 8 is located downstream of the indoor heat exchanger 22, allowing the medium to flow to the first side flow path 51 and the second side flow path 52. A three-way reversing valve 8 is also provided between the first side flow path 51 and the geothermal heat exchanger 42, allowing the medium to flow from the first side flow path 51 to the geothermal heat exchanger 42. In the first heat exchange mode, the medium can flow through the geothermal heat exchanger 42 to the three-way reversing valve 8, then to the third expansion valve 7, and then through the three-way reversing valve 8 to the indoor heat exchanger 22. In the first heat exchange mode, a three-way reversing valve 8 is located downstream of the outdoor heat exchanger 3. In the second heat exchange mode, the three-way reversing valve 8 is located downstream of the second expansion valve 521. Setting multiple three-way reversing valves 8 can reduce the piping setup and save on installation costs.

[0063] Furthermore, the heat pump system 100 is also equipped with an electromagnetic shut-off valve 9. When the defrosting of the outdoor heat exchanger 3 is completed in the defrosting mode of the heat pump, the electromagnetic shut-off valves 9 before and after the compressor 1 can be closed, so that the medium that has done work through the compressor 1 can flow to the indoor heat exchanger 22 to supply heat to the building, and then flow to the first side flow path 51 and the second side flow path 52 for heat exchange. The electromagnetic shut-off valve 9 can meet the different operating needs of the heat pump system 100.

[0064] In some embodiments, the heat pump system 100 further includes an air-cooled fan 31, which is located at the outdoor heat exchanger 3 and is used to drive airflow toward the outdoor heat exchanger 3.

[0065] Specifically, such as Figure 1 As shown, the heat pump system 100 is also equipped with an air-cooled fan 31, which has a motor and fan blades. The air-cooled fan 31 is located at the outdoor heat exchanger 3, and the fan blades of the air-cooled fan 31 face the outdoor heat exchanger 3. The motor has a motor shaft, which is fixedly connected to the fan blades. The motor can drive the motor shaft to rotate, which in turn drives the fan blades to rotate. When the fan blades rotate, they can drive the surrounding air to circulate faster, which can accelerate the airflow around the outdoor heat exchanger 3 and thus cool the outdoor heat exchanger 3.

[0066] When the heat pump system 100 is in the first heat exchange mode, the medium can absorb heat from the indoor heat exchanger 22 to cool the building. After heat exchange, the medium is compressed by the compressor 1 to form a high-temperature and high-pressure gas. The high-temperature and high-pressure gas can be introduced into the outdoor heat exchanger 3 to exchange heat with the outside environment and release heat to the outside environment. At this time, the outdoor heat exchanger 3 rises, and the air-cooled fan 31 can cool the outdoor heat exchanger 3, so that the outdoor heat exchanger 3 is within the operating temperature range, avoiding damage to the outdoor heat exchanger 3 due to excessive temperature, and extending the service life of the outdoor heat exchanger 3.

[0067] The following is combined with Figure 1This invention describes the specific connection states of the heat pump system 100 in a first heat exchange mode, a second heat exchange mode, and a heat pump defrosting mode. In the first heat exchange mode, the medium is compressed by the compressor 1 and flows through the first connection port 11 to the four-way reversing valve 6. It then flows through the first outlet 61 of the four-way reversing valve 6 to the second outlet 62, and further to the three-way reversing valve 8. Through the three-way reversing valve 8, it flows to the outdoor heat exchanger 3 to release heat. At this time, the air-cooled fan 31 operates, accelerating the airflow around the outdoor heat exchanger 3, thereby cooling the outdoor heat exchanger 3 and preventing it from overheating. After releasing heat, the medium flows along the pipe to the next three-way reversing valve 8, and then through the three-way reversing valve 8 to the geothermal heat exchanger 42 to release heat. The geothermal heat exchanger 42 can exchange heat with the geothermal system 4, thereby transferring heat to... In the geothermal system 4, a second water pump 41 is installed to allow the medium to flow in the geothermal system 4. After the medium in the heat pump system 100 releases heat in the geothermal heat exchanger 42, it can flow through the three-way reversing valve 8 downstream of the geothermal heat exchanger 42 to the third expansion valve 7. After expanding through the third expansion valve 7, it flows through the three-way reversing valve 8 to the indoor heat exchanger 22 to absorb heat. The indoor heat exchanger 22 can exchange heat with the building circulating water system 2, thereby absorbing heat from the building circulating water system 2. The building circulating water system 2 is equipped with a first water pump 21 to allow the medium to flow in the building circulating water system 2. After the medium in the heat pump system 100 absorbs heat, it can flow to the four-way reversing valve 6, flow through the third outlet 63 to the fourth outlet 64, and then flow through the second connection port 12 to the compressor 1 for further compression.

[0068] In the second heat exchange mode, after being compressed by the compressor 1, the medium flows through the first connection port 11 to the four-way reversing valve 6, through the first flow port 61 to the third flow port 63, and then to the indoor heat exchanger 22 to release heat. After releasing heat, part of the medium flows through the three-way reversing valve 8 and then expands through the first expansion valve 512 to the first side flow path 51 of the economizer 5, and then flows through the three-way reversing valve 8 to the geothermal heat exchanger 42 to absorb heat. After absorbing heat, the medium flows through the electronically controlled proportional valve 10 and the solenoid shut-off valve 9 and then through the third connection port 13 to the compressor 1 for compression again. The other part flows through the second side flow path 52 to the second expansion valve 521 and then through the three-way reversing valve 8 to the outdoor heat exchanger 3 to absorb heat. Then it flows through the three-way reversing valve 8 to the four-way reversing valve 6, through the second flow port 62 to the fourth flow port 64, and then to the compressor 1 for compression again.

[0069] In the heat pump defrosting mode, the medium, after being compressed by the compressor 1, flows through the first connection port 11 to the four-way reversing valve 6, then through the first outlet 61 to the third outlet 63, and finally to the indoor heat exchanger 22 to release heat. After releasing heat, the medium can flow through the three-way reversing valve 8 to the first expansion valve 512. After expanding through the first expansion valve 512, it flows to the first side flow path 51 of the economizer 5. The medium flowing out from the third outlet 63 can also flow to the solenoid shut-off valve 9, then through the solenoid shut-off valve 9 to the three-way reversing valve 8, and finally to the outdoor heat exchanger. Heat is released at the outdoor heat exchanger 3. The medium after releasing heat flows through the three-way reversing valve 8 to the second expansion valve 521, and then to the second side flow path 52. The medium undergoes heat exchange in the economizer 5. The medium in the first side flow path 51 absorbs the heat of the medium in the second side flow path 52 and then flows to the three-way reversing valve 8. The medium then flows through the three-way reversing valve 8 to the geothermal heat exchanger 42 to absorb heat. The medium after absorbing heat flows through the electronically controlled proportional valve 10 and the solenoid shut-off valve 9 and then through the third connection port 13 to the compressor 1 for compression again.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat pump system, characterized in that, include: The compressor comprises an indoor heat exchanger, an outdoor heat exchanger, and a geothermal heat exchanger. The indoor heat exchanger is used for heat exchange with the building's circulating water system, and the geothermal heat exchanger is used for heat exchange with the geothermal system. The compressor is provided with a first connection port, a second connection port, and a third connection port. The heat pump system includes a heat pump defrost mode, a first heat exchange mode, and a second heat exchange mode. In the heat pump defrost mode, the outlet end of the geothermal heat exchanger is connected to the inlet end of the compressor, and the indoor heat exchanger and the outdoor heat exchanger are connected in parallel between the outlet end of the compressor and the inlet end of the geothermal heat exchanger to form a loop. In the first heat exchange mode, the compressor, the outdoor heat exchanger, the geothermal heat exchanger, and the indoor heat exchanger are connected in series to form a loop. In the second heat exchange mode, the compressor and the indoor heat exchanger are connected in series, and the outdoor heat exchanger... The heat pump defrost mode is connected in parallel with the geothermal heat exchanger between the indoor heat exchanger and the compressor to form a loop. In the first heat exchange mode, the second connection port is connected to the geothermal heat exchanger and the first connection port is connected to both the indoor and outdoor heat exchangers. In the second heat exchange mode, the first connection port is connected to the outdoor heat exchanger and the second connection port is connected to the indoor heat exchanger. In the third heat exchange mode, the first connection port is connected to the indoor heat exchanger, the second connection port is connected to the outdoor heat exchanger, and the third connection port is connected to the geothermal heat exchanger.

2. The heat pump system according to claim 1, characterized in that, It also includes an economizer, which has a first side flow path and a second side flow path, the first side flow path being adapted to exchange heat with the second side flow path; In the heat pump defrosting mode, the first side flow path is connected in series between the indoor heat exchanger and the geothermal heat exchanger, and the second side flow path is connected in series between the outdoor heat exchanger and the inlet end of the first side flow path. In the second heat exchange mode, the first side flow path is connected in series between the indoor heat exchanger and the geothermal heat exchanger, and the second side flow path is connected in series between the indoor heat exchanger and the outdoor heat exchanger.

3. The heat pump system according to claim 2, characterized in that, In the heat pump defrosting mode, the medium flow direction in the first side flow path is the same as the medium flow direction in the second side flow path; In the second heat exchange mode, the medium flow direction in the first side flow path is opposite to the medium flow direction in the second side flow path.

4. The heat pump system according to claim 2, characterized in that, It also includes a first expansion valve and a second expansion valve, the first expansion valve being located between the indoor heat exchanger and the first side flow path, and the second expansion valve being located between the outdoor heat exchanger and the second side flow path.

5. The heat pump system according to claim 4, characterized in that, The first expansion valve and the second expansion valve are configured to be independently adjustable.

6. The heat pump system according to claim 1, characterized in that, It also includes a four-way directional valve, which has a first flow port, a second flow port, a third flow port and a fourth flow port; In the heat pump defrosting mode, the first and third inlets are connected between the compressor and the indoor heat exchanger; in the second heat exchange mode, the first and third inlets are connected between the compressor and the indoor heat exchanger, and the second and fourth inlets are connected between the outdoor heat exchanger and the compressor; and in the first heat exchange mode, the first and second inlets are connected between the compressor and the outdoor heat exchanger, and the third and fourth inlets are connected between the indoor heat exchanger and the compressor.

7. The heat pump system according to claim 1, characterized in that, It also includes a third expansion valve, which is connected between the geothermal heat exchanger and the indoor heat exchanger in the first heat exchange mode.

8. The heat pump system according to claim 1, characterized in that, It also includes an air-cooled fan, which is located at the outdoor heat exchanger and is used to drive airflow toward the outdoor heat exchanger.

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