Energy-saving heat pump unit

Abstract

The invention discloses an energy-saving heat pump unit which comprises demand equipment, a gas-liquid separator, an inverter compressor, a high-pressure pressure sensor, a compressor exhaust temperature sensor, a four-way reversing valve, a first stop valve, a second stop valve, a third stop valve, a plate heat exchanger, a fourth stop valve, a fifth stop valve control assembly and a condenser. A third connector of the four-way reversing valve is connected with the gas-liquid separator, the two ends of the condenser are connected with a second connector of the four-way reversing valve and the valve control assembly respectively, the second stop valve is arranged on a connecting line of the second connector, and the two ends of the first stop valve are connected with the third connector and the valve control assembly respectively. A second inlet of the plate heat exchanger is connected with a first connector of the four-way reversing valve and the inverter compressor, the inverter compressor is connected with the gas-liquid separator, and the valve control assembly is connected with demand equipment. The refrigerant is adopted to directly take away heat generated by the battery cell or transmit external heat to the battery cell, so that the problem of high energy consumption is solved, and meanwhile, unit faults are reduced.

Description

Technical Field

[0001] This invention relates to battery cell technology, and more particularly to an energy-saving heat pump unit. Background Technology

[0002] Currently, with the increasingly widespread application of energy storage, the temperature control of energy storage cells is becoming more and more important. The units that heat and cool the cells need to be used for a long time, and stable operation and good temperature control are key.

[0003] Patent document with application number "CN202111542549.X" discloses a heat pump type solution dehumidification air conditioning unit, belonging to the technical field of air conditioning units. It includes a unit casing, inside which are respectively arranged a multi-stage indirect evaporation section, a solution dehumidification section, a direct evaporation section, a return air supply section, a fresh air supply section, and a refrigeration system. The side wall of the casing where the multi-stage indirect evaporation section is located has a return air inlet and a fresh air inlet, and the interior of the multi-stage indirect evaporation core includes a first spray bar, a filter, and a water circuit solenoid valve. The solution dehumidification section includes a dehumidification core, a solution spray bar, a solution tank, and a solution spray pump. The direct evaporation section includes a second spray bar, a direct evaporation core, a water tank, a spray pump, and a titanium tube heat exchanger. The titanium tube heat exchanger is connected to the solution spray pump, the solution spray bar, the spray pump, and the second spray bar via pipelines. This design addresses the shortcomings of existing indirect evaporation air conditioning systems and solution dehumidification technologies.

[0004] Patent document with application number "CN201721798462.8" discloses a dual-evaporator dehumidification heat pump unit, comprising a swimming pool. The swimming pool includes a compressor, a four-way valve, a first heat exchanger, a throttling valve, and a second heat exchanger. The compressor, four-way valve, first heat exchanger, throttling valve, and second heat exchanger are sequentially connected via refrigerant pipes to form a refrigerant circulation loop. Indoor air from the swimming pool is drawn to the compressor by a fan. The pool's drain outlet is connected to the first heat exchanger via a circulation pump and a sand filter. The first heat exchanger delivers heated water to the pool's inlet. An indoor evaporator with an input terminal connected to an indoor solenoid valve is located between the throttling valve and the compressor. An air filter and an outdoor evaporator are connected between the fan and the compressor. The outdoor evaporator is connected to the throttling valve via an outdoor solenoid valve, and the compressor's outlet is connected to the condenser. This invention effectively improves the rapid rise of indoor temperature during the initial dehumidification phase, significantly reduces energy consumption during the initial dehumidification phase, and simultaneously improves dehumidification efficiency.

[0005] The aforementioned patent documents, in conjunction with existing technology, reveal the following shortcomings of current energy-saving heat pump units: The existing solution uses a compressor for refrigeration, which is then transferred to the water side via a plate heat exchanger. The heat is then carried away through indirect contact between the liquid and the battery cells. When heating is required, a PTC electric heater is used to heat the liquid-cooled liquid, which is then transferred to the battery cells. This existing solution consumes a lot of energy, and the current water pump design results in a relatively short lifespan and frequent malfunctions. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides an energy-saving heat pump unit, which solves the related problems of energy-saving heat pump units.

[0007] The first aspect of this invention provides an energy-saving heat pump unit, comprising a demand device, a gas-liquid separator, a variable frequency compressor, a high-pressure sensor, a compressor exhaust temperature sensor, a four-way reversing valve, a first shut-off valve, a second shut-off valve, a third shut-off valve, a plate heat exchanger, a fourth shut-off valve, a fifth shut-off valve, a valve control assembly, and a condenser. The plate heat exchanger has a first inlet, a second inlet, a first outlet, and a second outlet. One end of the demand device is divided into two lines, connected to the first outlet and the fourth port of the four-way reversing valve respectively. The third port of the four-way reversing valve is connected to the gas-liquid separator. Both ends of the condenser are connected to the second port of the four-way reversing valve and the valve control assembly respectively. The second shut-off valve is located at the connection point of the second port. The two ends of a shut-off valve are respectively connected to the third interface and the valve control assembly; the fourth shut-off valve is located at the line of the first outlet, and the fifth shut-off valve is located at the line of the second outlet; the second outlet of the plate heat exchanger and the output end of the demand device are respectively connected to the valve control assembly; the first inlet of the plate heat exchanger is connected to the second interface of the condenser and the four-way reversing valve through the third shut-off valve; the second inlet of the plate heat exchanger is connected to the first interface of the four-way reversing valve and the variable frequency compressor; the high pressure sensor and the compressor exhaust temperature sensor are located on the connection line between the first interface and the variable frequency compressor; the variable frequency compressor is connected to the gas-liquid separator; and the valve control assembly is connected to the demand device.

[0008] In a preferred embodiment of the first aspect of the present invention, the valve control assembly includes a seventh shut-off valve, a one-way valve, a liquid storage tank, a dryer filter, a first heating electronic expansion valve, a second cooling electronic expansion valve, an outlet temperature sensor, and a condenser inlet temperature sensor. The valve control assembly is divided into three parallel lines. The first parallel line is equipped with the seventh shut-off valve and the first heating electronic expansion valve. The second parallel line is equipped with the liquid storage tank and the dryer filter. The third parallel line is equipped with the one-way valve and the second cooling electronic expansion valve. The middle part of the first parallel line is connected to the condenser through the condenser inlet temperature sensor, and the middle part of the third parallel line is connected to the required device through the outlet temperature sensor.

[0009] In a first aspect of the present invention, as a preferred embodiment, the energy-saving heat pump unit further includes a low-pressure sensor and a compressor suction temperature sensor, wherein the low-pressure sensor and the compressor suction temperature sensor are disposed on the connection line between the third port of the four-way reversing valve and the gas-liquid separator.

[0010] In a first aspect of the invention, as a preferred embodiment, the energy-saving heat pump unit further includes a sixth shut-off valve, and the connection point of the three parallel lines is connected to the second outlet of the plate heat exchanger through the sixth shut-off valve.

[0011] In a first aspect of the invention, as a preferred embodiment, the energy-saving heat pump unit further includes an electric fan disposed on the side of the condenser.

[0012] In a first aspect of the present invention, as a preferred embodiment, the energy-saving heat pump unit further includes a unit return gas temperature sensor, which is disposed on the connection line between the first outlet and the required equipment.

[0013] In a first aspect of the invention, as a preferred embodiment, the energy-saving heat pump unit further includes an outdoor temperature sensor.

[0014] In a first aspect of the present invention, as a preferred embodiment, the outdoor temperature sensor includes a housing. Inside the housing, a temperature sensing element, a clock circuit, a control circuit, and a radio frequency circuit are disposed in the middle. Inside the housing, a photoelectric conversion circuit, a battery storage circuit, a power management circuit, and an energy storage circuit are disposed in the lower part. Inside the housing, a sorting circuit and an A / D conversion circuit are disposed in the upper part. The temperature sensing element is connected to the sorting circuit, the sorting circuit is connected to the A / D conversion circuit, the A / D conversion circuit is connected to the control circuit, and the control circuit is also connected to the radio frequency circuit, the clock circuit, and the power management circuit respectively. The power management circuit is then connected to the photoelectric conversion circuit and the radio frequency circuit respectively through the battery storage circuit and the energy storage circuit.

[0015] In a first aspect of the present invention, as a preferred embodiment, the rated power of the variable frequency compressor is between 1500-3000W.

[0016] In a first aspect of the present invention, as a preferred embodiment, the drying filter includes a cylinder, a front end cover, a rear end cover, a first filter screen, a second filter screen, and a desiccant. The cylinder, the front end cover, and the rear end cover are separate units. The desiccant is filled in a desiccant storage box. There are several desiccant storage boxes, which are arranged in an orderly manner on the inner surface of the cylinder and located between the first filter screen and the second filter screen. Several vents are provided on the outer surface of the desiccant storage box.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The plate heat exchanger is provided with a first inlet, a second inlet, a first outlet, and a second outlet. One end of the required equipment is split into two lines, connected to the first outlet and the fourth port of a four-way reversing valve respectively. The third port of the four-way reversing valve is connected to the gas-liquid separator. Both ends of the condenser are connected to the second port of the four-way reversing valve and the valve control assembly respectively. The second shut-off valve is located at the connection line of the second port. Both ends of the first shut-off valve are connected to the third port and the valve control assembly respectively. The fourth shut-off valve is located at the line of the first outlet, and the fifth shut-off valve is located at... At the second outlet line; the second outlet of the plate heat exchanger and the output end of the demand device are respectively connected to the valve control assembly; the first inlet of the plate heat exchanger is connected to the condenser and the second interface of the four-way reversing valve through the third shut-off valve; the second inlet of the plate heat exchanger is connected to the first interface of the four-way reversing valve and the variable frequency compressor; the high pressure sensor and the compressor exhaust temperature sensor are set on the connection line between the first interface and the variable frequency compressor; the variable frequency compressor is connected to the gas-liquid separator; and the valve control assembly is connected to the demand device. In this application, compressor refrigeration is switched to the liquid side through the plate heat exchanger to cool the liquid and PTC to heat the liquid, and then the cell temperature is kept within a suitable range. The refrigerant directly carries away the heat generated by the cell or transfers the heat from the outside to the cell, solving the problem of high energy consumption and reducing unit failures. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of the present invention; Figure 2 This is the system circuit diagram of the present invention.

[0019] In the diagram: 1. Gas-liquid separator; 2. Variable frequency compressor; 3. High-pressure sensor; 4. Compressor discharge temperature sensor; 5. Four-way reversing valve; 6. Low-pressure sensor; 7. Compressor suction temperature sensor; 8. First shut-off valve; 9. Second shut-off valve; 10. Third shut-off valve; 11. Plate heat exchanger; 12. Fourth shut-off valve; 13. Fifth shut-off valve; 14. Unit return gas temperature sensor; 15. Sixth shut-off valve; 16. Seventh shut-off valve; 17. Check valve; 18. Liquid receiver; 19. Dryer filter; 20. First heating electronic expansion valve; 21. Second cooling electronic expansion valve; 22. Liquid outlet temperature sensor; 23. Condenser inlet temperature sensor; 24. Condenser; 25. Electric fan; 26. Outdoor temperature sensor; Valve control assembly 200. Detailed Implementation

[0020] The invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are commercially available. Examples of the 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 this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0024] like Figure 1-2As shown, an energy-saving heat pump unit includes a demand device, a gas-liquid separator 1, a variable frequency compressor 2, a high-pressure sensor 3, a compressor exhaust temperature sensor 4, a four-way reversing valve 5, a first shut-off valve 8, a second shut-off valve 9, a third shut-off valve 10, a plate heat exchanger 11, a fourth shut-off valve 12, a fifth shut-off valve 13, a valve control assembly 200, and a condenser 24. The plate heat exchanger 11 has a first inlet, a second inlet, a first outlet, and a second outlet. One end of the demand device is divided into two lines, connected to the first outlet and the fourth port of the four-way reversing valve 5 respectively. The third port of the four-way reversing valve 5 is connected to the gas-liquid separator 1. Both ends of the condenser 24 are connected to the second port of the four-way reversing valve 5 and the valve control assembly 200 respectively. The second shut-off valve 9 is located at the connection point of the second port. The first shut-off valve... Both ends of 8 are connected to the third interface and the valve control assembly 200, respectively; the fourth shut-off valve 12 is located at the line of the first outlet, and the fifth shut-off valve 13 is located at the line of the second outlet; the second outlet of the plate heat exchanger 11 and the output end of the demand device are connected to the valve control assembly 200, respectively; the first inlet of the plate heat exchanger 11 is connected to the second interface of the condenser 24 and the four-way reversing valve 5 through the third shut-off valve 10, respectively; the second inlet of the plate heat exchanger 11 is connected to the first interface of the four-way reversing valve 5 and the variable frequency compressor 2, respectively; the high pressure sensor 3 and the compressor exhaust temperature sensor 4 are located on the connection line between the first interface and the variable frequency compressor 2; the variable frequency compressor 2 is connected to the gas-liquid separator 1; and the valve control assembly 200 is connected to the demand device. In this application, a compressor is used to refrigerate the liquid side via a plate heat exchanger, thereby cooling the liquid and heating it with a PTC. The temperature of the battery cell is then kept within a suitable range. The refrigerant directly carries away the heat generated by the battery cell or transfers external heat to the battery cell, which solves the problem of high energy consumption and reduces unit failures.

[0025] In a preferred embodiment of the first aspect of the present invention, the valve control assembly 200 includes a seventh shut-off valve 16, a one-way valve 17, a liquid storage tank 18, a dryer filter 19, a first heating electronic expansion valve 20, a second cooling electronic expansion valve 21, an outlet temperature sensor 22, and a condenser inlet temperature sensor 23. The valve control assembly 200 is divided into three parallel lines. The first parallel line is equipped with the seventh shut-off valve 16 and the first heating electronic expansion valve 20. The second parallel line is equipped with the liquid storage tank 18 and the dryer filter 19. The third parallel line is equipped with the one-way valve 17 and the second cooling electronic expansion valve 21. The middle part of the first parallel line is connected to the condenser 24 through the condenser inlet temperature sensor 23. The middle part of the third parallel line is connected to the required equipment through the outlet temperature sensor 22, which facilitates the control of the lines.

[0026] In a preferred embodiment of the first aspect of the invention, the energy-saving heat pump unit further includes a low-pressure sensor 6 and a compressor suction temperature sensor 7, which are disposed on the connection line between the third port of the four-way reversing valve 5 and the gas-liquid separator 1. Specifically, the energy-saving heat pump unit further includes a sixth shut-off valve 15, and the connection point of the three parallel lines is connected to the second outlet of the plate heat exchanger 11 through the sixth shut-off valve 15.

[0027] In a first aspect of the present invention, as a preferred embodiment, the energy-saving heat pump unit further includes an electric fan 25, which is disposed on the side of the condenser 24 to improve heat dissipation efficiency.

[0028] In a first aspect of the invention, as a preferred embodiment, the energy-saving heat pump unit further includes a unit return air temperature sensor 14, which is disposed on the connection line between the first outlet and the demanding equipment. The energy-saving heat pump unit also includes an outdoor temperature sensor 26 to improve the accuracy of temperature control.

[0029] Specifically, during the execution of this application, there are three operating routes: 1. The first type is the normal temperature refrigeration operation route: Variable frequency compressor 2 → High pressure sensor 3 → Compressor discharge temperature sensor 4 → Four-way reversing valve 5 - one and two phases connected, three and four phases connected → Second shut-off valve 9 - in conduction state → Condenser 24, required equipment → Condenser inlet temperature sensor 23 → Seventh shut-off valve 16 - in conduction state → Liquid receiver 18 → Dryer filter 19 → Second refrigeration electronic expansion valve 21 → Liquid outlet temperature sensor 22 → Required equipment → Unit return gas temperature sensor 14 → Fifth shut-off valve 13 - in conduction state → Four-way reversing valve 5 - one and two phases connected, three and four phases connected → Compressor suction temperature sensor 7 → Low pressure sensor 6 → Gas-liquid separator 1 → Variable frequency compressor 2.

[0030] Specifically, when operating in the normal temperature refrigeration mode, the first shut-off valve 8, the third shut-off valve 10, the fourth shut-off valve 12, and the sixth shut-off valve 15 are in the closed state.

[0031] 2. The second type is the low-temperature refrigeration operation route: Variable frequency compressor 2 → High pressure sensor 3 → Compressor exhaust temperature sensor 4 → Plate heat exchanger 11 → Sixth shut-off valve 15 - On state → Liquid storage tank 18 → Dryer filter 19 → Liquid outlet temperature sensor 22 → Required equipment → Unit return gas temperature sensor 14 → Fourth shut-off valve 12 - On state → Third shut-off valve 10 - On state → Condenser 24 → First shut-off valve 8 - On state → Compressor suction temperature sensor 7 → Low pressure sensor 6 → Gas-liquid separator 1 → Variable frequency compressor 2.

[0032] Specifically, when operating in the low-temperature refrigeration mode, the four-way reversing valve 5 is in the state of one and two phases connected, and three and four phases connected, while the second shut-off valve 9, the fifth shut-off valve 13, and the seventh shut-off valve 16 are in the closed state.

[0033] 3. The third type is the heating operation route. Variable frequency compressor 2 → High pressure sensor 3 → Compressor discharge temperature sensor 4 → Four-way reversing valve 5 - one and four phases connected, two and three phases connected → Fifth shut-off valve 13 - in conduction state → Unit return gas temperature sensor 14 → Required equipment → Liquid outlet temperature sensor 22 → One-way valve 17 → Liquid storage tank 18 → Dryer filter 19 → First heating electronic expansion valve 20 → Condenser inlet temperature sensor 23 → Condenser 24 → Second shut-off valve 9 - in conduction state → Four-way reversing valve 5 - one and four phases connected, two and three phases connected → Compressor suction temperature sensor 7 → Low pressure sensor 6 → Gas-liquid separator 1 → Variable frequency compressor 2 Note: The first shut-off valve 8, the third shut-off valve 10, the fourth shut-off valve 12, the sixth shut-off valve 15, and the seventh shut-off valve 16 are in the closed state.

[0034] Specifically, it should be noted that the variable frequency compressor uses variable speed control. When the demand increases, the compressor speed increases; when the demand decreases, the compressor speed decreases.

[0035] The electric fan uses variable speed control; when demand increases, the fan speed increases; when demand decreases, the fan speed decreases.

[0036] In practical use, the electronic expansion valve adopts an overheat control method and is adjusted by PID as needed. High temperature and pressure protection are set at the compressor outlet position, and pressure and temperature protection are set at the compressor suction position.

[0037] It should be noted that in cooling mode, first switch the four-way reversing valve to cooling mode, then turn on the electric fan, then start the compressor, and simultaneously open the electronic expansion valve. The fan is adjusted according to the ambient temperature, the compressor is adjusted according to the required cooling capacity or the target outlet temperature of the electronic expansion valve, and the electronic expansion valve is adjusted using PID control based on the superheat.

[0038] It should be noted that in heating mode, first switch the four-way reversing valve to the heating state, then turn on the electric fan, then start the compressor, and at the same time open the electronic expansion valve. The fan is adjusted according to the ambient temperature, the compressor is adjusted according to the required cooling capacity or the target outlet temperature of the electronic expansion valve, and the electronic expansion valve is adjusted by PID control according to the superheat.

[0039] During operation, protection measures are required for outlet high temperature, outlet high pressure, suction low pressure, and overheating. Ideally, the compressor and fan of the heat pump unit should be variable frequency; otherwise, the unit may fail to operate when cooling or heating is required. PID control is necessary.

[0040] The advantages of this application are as follows: 1. In both cooling and heating modes, the liquid needs to pass through the liquid storage tank and the dryer filter to avoid reducing the system calibration performance of the multi-loop system.

[0041] 2. Add a liquid storage tank to extend the system's service life; 3. Add a low-temperature refrigeration circuit to solve the problem of refrigeration not meeting the operating conditions under low-temperature conditions, which may lead to equipment damage.

[0042] In a first aspect of the present invention, as a preferred embodiment, the outdoor temperature sensor 26 includes a housing. Inside the housing, a temperature sensing element, a clock circuit, a control circuit, and a radio frequency circuit are disposed in the middle. Inside the housing, a photoelectric conversion circuit, a battery storage circuit, a power management circuit, and an energy storage circuit are disposed in the lower part. Inside the housing, a sorting circuit and an A / D conversion circuit are disposed in the upper part. The temperature sensing element is connected to the sorting circuit, the sorting circuit is connected to the A / D conversion circuit, the A / D conversion circuit is connected to the control circuit, and the control circuit is also connected to the radio frequency circuit, the clock circuit, and the power management circuit respectively. The power management circuit is then connected to the photoelectric conversion circuit and the radio frequency circuit respectively through the battery storage circuit and the energy storage circuit.

[0043] In a first aspect of the invention, as a preferred embodiment, the variable frequency compressor 2 Its rated power is between 1500-3000W.

[0044] In a first aspect of the present invention, as a preferred embodiment, the drying filter 19 includes a cylindrical body, a front end cover, a rear end cover, a first filter screen, a second filter screen, and a desiccant. The cylindrical body, the front end cover, and the rear end cover are separate units. The desiccant is filled in a desiccant storage box. There are several desiccant storage boxes, which are arranged in an orderly manner on the inner surface of the cylindrical body and located between the first filter screen and the second filter screen. Several vents are provided on the outer surface of the desiccant storage box.

[0045] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An energy-saving heat pump unit, characterized in that, The system includes a demand device, a gas-liquid separator, a variable frequency compressor, a high-pressure sensor, a compressor exhaust temperature sensor, a four-way reversing valve, a first shut-off valve, a second shut-off valve, a third shut-off valve, a plate heat exchanger, a fourth shut-off valve, a fifth shut-off valve, a valve control assembly, and a condenser. The plate heat exchanger has a first inlet, a second inlet, a first outlet, and a second outlet. One end of the demand device is divided into two lines, which are respectively connected to the first outlet and the fourth interface of the four-way reversing valve. The third interface of the four-way reversing valve is connected to the gas-liquid separator. Both ends of the condenser are respectively connected to the second interface of the four-way reversing valve and the valve control assembly. The second shut-off valve is located at the connection line of the second interface. Both ends of the first shut-off valve are respectively connected to the third interface and the valve control assembly. The fourth shut-off valve is located at the line of the first outlet, and the fifth shut-off valve is located at the line of the second outlet. The second outlet of the plate heat exchanger and the output end of the demand equipment are respectively connected to the valve control assembly, and the first inlet of the plate heat exchanger is connected to the second interface of the condenser and the four-way reversing valve through the third shut-off valve. The second inlet of the plate heat exchanger is connected to the first port of the four-way reversing valve and the variable frequency compressor. The high pressure sensor and the compressor exhaust temperature sensor are installed on the connection line between the first port and the variable frequency compressor. The variable frequency compressor is connected to the gas-liquid separator. The valve control assembly is connected to the required equipment.

2. The energy-saving heat pump unit as described in claim 1, characterized in that: The valve control assembly includes a seventh shut-off valve, a one-way valve, a liquid storage tank, a dryer filter, a first heating electronic expansion valve, a second cooling electronic expansion valve, an outlet temperature sensor, and a condenser inlet temperature sensor. The valve control assembly is divided into three parallel lines. The first parallel line is equipped with the seventh shut-off valve and the first heating electronic expansion valve. The second parallel line is equipped with the liquid storage tank and the dryer filter. The third parallel line is equipped with the one-way valve and the second cooling electronic expansion valve. The middle part of the first parallel line is connected to the condenser through the condenser inlet temperature sensor, and the middle part of the third parallel line is connected to the required equipment through the outlet temperature sensor.

3. The energy-saving heat pump unit as described in claim 2, characterized in that: The energy-saving heat pump unit also includes a low-pressure sensor and a compressor suction temperature sensor, which are located on the connection line between the third port of the four-way reversing valve and the gas-liquid separator.

4. The energy-saving heat pump unit as described in claim 2, characterized in that: The energy-saving heat pump unit also includes a sixth shut-off valve, and the connection point of the three parallel lines is connected to the second outlet of the plate heat exchanger through the sixth shut-off valve.

5. The energy-saving heat pump unit as described in claim 1, characterized in that: The energy-saving heat pump unit also includes an electric fan, which is located on the side of the condenser.

6. The energy-saving heat pump unit as described in claim 1, characterized in that: The energy-saving heat pump unit also includes a unit return gas temperature sensor, which is installed on the connection line between the first outlet and the required equipment.

7. The energy-saving heat pump unit as described in claim 1, characterized in that: The energy-saving heat pump unit also includes an outdoor temperature sensor.

8. The energy-saving heat pump unit as described in claim 7, characterized in that: The outdoor temperature sensor includes a housing. Inside the housing, in the middle, are a temperature sensing element, a clock circuit, a control circuit, and a radio frequency circuit. In the lower part of the housing, there are a photoelectric conversion circuit, a battery storage circuit, a power management circuit, and an energy storage circuit. In the upper part of the housing, there are a sorting circuit and an A / D conversion circuit. The temperature sensing element is connected to the sorting circuit, the sorting circuit is connected to the A / D conversion circuit, the A / D conversion circuit is connected to the control circuit, and the control circuit is also connected to the radio frequency circuit, the clock circuit, and the power management circuit. The power management circuit is then connected to the photoelectric conversion circuit and the radio frequency circuit through the battery storage circuit and the energy storage circuit, respectively.

9. The energy-saving heat pump unit as described in claim 1, characterized in that: The rated power of the variable frequency compressor is between 1500-3000W.

10. The energy-saving heat pump unit as described in claim 2, characterized in that: The drying filter includes a cylinder, a front cover, a rear cover, a first filter screen, a second filter screen, and a desiccant. The cylinder, the front cover, and the rear cover are separate units. The desiccant is filled in a desiccant storage box. There are several desiccant storage boxes, which are arranged in an orderly manner on the inner surface of the cylinder and located between the first filter screen and the second filter screen. Several vents are opened on the outer surface of the desiccant storage box.

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