Refrigerating system driven by refrigerant pump and control method thereof

Abstract

The invention provides a refrigerating system driven by a refrigerant pump and a control method of the refrigerating system. The refrigerating system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, the refrigerant pump, a valve assembly and a throttling device. The compressor and the refrigerant pump are connected with the outdoor heat exchanger and the indoor heat exchanger through the valve assembly and the throttling device respectively, and the refrigerant pump is communicated with the compressor. Switching of three operation modes of the refrigerating system is achieved through control of the valve assembly and the throttling device. When the environment temperature is larger than a second preset temperature, the refrigerating system is switched to be in a compressor operation mode. When the environment temperature is larger than or equal to the first preset temperature and smaller than or equal to the second preset temperature, the refrigerating system is switched into a compressor air supply operation mode; and when the environment temperature is smaller than the first preset temperature, the refrigerating system is switched into a refrigerant pump operation mode. According to the refrigerating system, the refrigerant can be provided for the heat exchanger through the compressor or the refrigerating machine pump, meanwhile, the gaseous refrigerant can be provided for the compressor through the refrigerant pump for air supplement in the compressor air supplement operation mode, and normal starting operation of the refrigerating system at different environment temperatures is ensured; and therefore, the reliability, effectiveness and energy-saving performance of the refrigerating system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly relates to a refrigerant pump-driven refrigeration system and a control method thereof. Background Art

[0002] With the rapid development of the communication industry, the heat generation of a single cabinet in a data center is increasing. The heat generation of some cabinets has exceeded 20KW. To achieve the heat dissipation of the cabinets, the demand for row coolers is increasing. Existing row coolers generally come with a compressor and an evaporator. Each row cooler is matched with an outdoor unit one by one to achieve the refrigeration and heating of the data center. In addition, the row cooler can also be driven by a refrigerant liquid pump. At this time, all row coolers can use a unified refrigerant liquid storage tank, and all row coolers can share one outdoor unit to supply liquid to the indoor units of each row cooler.

[0003] In winter or the transitional season, when using a conventional compressor for refrigeration, due to the relatively low outdoor ambient temperature, the condensation temperature of the refrigerant is relatively low (for example, 10°C to 30°C). At this time, the operating pressure ratio of the compressor is the smallest and close to 1.2 (the evaporation temperature is 15°C). In this case, it is easy to cause reliability problems such as poor oil return of the compressor and poor lubrication due to the accumulation of refrigerant inside the compressor. In addition, the relatively low-temperature refrigerant entering the indoor heat exchanger is likely to trigger the anti-freezing protection and cause serious frosting, affecting the normal operation of the compressor and the heat exchanger. To improve the above situation, if a normal compressor vapor compression refrigeration method is selected in summer, and in winter, the outdoor cold air is used as a natural cold source, the operation of the compressor is stopped, and the refrigerant pump is used to drive the refrigerant circulation to achieve heat pipe refrigeration operation, the equipment operation cost can be greatly reduced and the operation stability can be improved.

[0004] For those skilled in the art, how to integrate multiple refrigeration systems and refrigeration forms to always ensure the reliability of the refrigeration system operation and the effectiveness of control has become the research direction for designers. Summary of the Invention

[0005] The purpose of the present invention is to provide a refrigerant pump-driven refrigeration system and a control method thereof. The refrigeration system can switch between three refrigeration modes, and respectively supply refrigerant to the heat exchanger through the compressor or the refrigerant pump in the compressor operation mode and the refrigerant pump operation mode. The refrigeration system can also supply gaseous refrigerant to the compressor for gas replenishment through the refrigerant pump in the compressor gas replenishment operation mode, ensuring the normal start-up operation of the refrigeration system under different ambient temperatures, and further improving the reliability, effectiveness and energy saving of the refrigeration system.

[0006] To achieve the above object, the present invention provides a refrigeration system driven by a refrigerant pump, which includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a refrigerant pump, a valve assembly and a throttling device; the compressor and the refrigerant pump are respectively connected to the outdoor heat exchanger and the indoor heat exchanger through the valve assembly and the throttling device, and the refrigerant pump is communicated with the compressor;

[0007] When the ambient temperature is greater than the second preset temperature, the refrigeration system switches to the compressor operation mode;

[0008] When the ambient temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the refrigerant pump supplies gaseous refrigerant to the compressor for gas replenishment, and the refrigeration system switches to the compressor gas replenishment operation mode;

[0009] When the ambient temperature is less than the first preset temperature, the refrigeration system switches to the refrigerant pump operation mode.

[0010] Optionally, the valve assembly includes a four-way reversing valve. The suction port of the compressor and the inlet of the refrigerant pump are connected in parallel and then used to communicate with the second port of the four-way reversing valve. The discharge port of the compressor and the liquid outlet of the refrigerant pump are connected in parallel and then used to communicate with the first port of the four-way reversing valve; the indoor heat exchanger is used to communicate with the third port of the four-way reversing valve, and the outdoor heat exchanger is used to communicate with the fourth port of the four-way reversing valve.

[0011] Optionally, the valve assembly further includes a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve. The second solenoid valve is arranged between the compressor and the second port, the third solenoid valve is arranged between the compressor and the first port, the fourth solenoid valve is arranged between the refrigerant pump and the second port, and the fifth solenoid valve is arranged between the liquid discharge port of the refrigerant pump and the first port.

[0012] Optionally, the valve assembly further includes a first solenoid valve, which is arranged between the gas outlet of the refrigerant pump and the injection port of the compressor. The refrigerant pump is used to supply gaseous refrigerant to the compressor for gas replenishment after the first solenoid valve is opened.

[0013] Optionally, the refrigerant pump includes a pump body and a separation component. The separation component is communicated with the pump body. The gas outlet and the inlet of the refrigerant pump are arranged on the separation component, and the liquid outlet of the refrigerant pump is arranged on the pump body.

[0014] Optionally, in the air supplement operation mode of the compressor, the separation component is used to supply gaseous refrigerant to the compressor for air supplement; in the refrigerant pump operation mode, the separation component is used to supply liquid refrigerant to the pump body.

[0015] Optionally, the refrigeration system driven by a refrigerant pump further includes a liquid storage tank, which is arranged between the second port of the four-way reversing valve and the inlet of the refrigerant pump, and the fourth solenoid valve is arranged between the liquid storage tank and the second port; the inlet of the liquid storage tank can be selectively communicated with the indoor heat exchanger or the outdoor heat exchanger through the valve assembly, the outlet of the liquid storage tank is communicated with the inlet of the refrigerant pump, and the liquid storage tank is used to supply refrigerant to the refrigerant pump when the ambient temperature is less than or equal to the second preset temperature.

[0016] Optionally, the throttling device further includes a first throttling device, which is located between the outlet of the liquid storage tank and the inlet of the refrigerant pump and is respectively communicated with the liquid storage tank and the refrigerant pump.

[0017] Optionally, the separation component includes an air suction pipe, a suspension component and a housing. There is an accommodation space in the housing for accommodating gaseous refrigerant and liquid refrigerant; the air outlet is arranged on the air suction pipe, and the air suction pipe is partially inserted into the accommodation space. The lower end surface of the air suction pipe is higher than the initial liquid refrigerant level in the accommodation space and is used to transport the gaseous refrigerant in the accommodation space to the compressor.

[0018] The suspension component includes a liquid level float, which is movably connected to the air suction pipe. The liquid level float can move relative to the air suction pipe when the liquid level of the liquid refrigerant rises and block the air outlet.

[0019] Optionally, the separation component further includes an upper limit member and a lower limit member, both of which are connected to the air suction pipe. The upper limit member is used to define the upper limit position of the movement of the liquid level float, and the lower limit member is used to define the lower limit position of the movement of the liquid level float.

[0020] Optionally, the throttling device further includes a second throttling device, which is located between the indoor heat exchanger and the outdoor heat exchanger and is respectively communicated with the indoor heat exchanger and the outdoor heat exchanger.

[0021] To achieve the above object, the present invention also provides a control method for a refrigeration system driven by a refrigerant pump, which is applicable to any of the refrigeration systems driven by a refrigerant pump; the control method for the refrigeration system driven by a refrigerant pump includes the following steps:

[0022] S01. The refrigeration system is powered on, the ambient temperature is dynamically detected, the temperature range to which the ambient temperature belongs is determined, and corresponding steps are executed according to the belonging temperature range;

[0023] If the detected ambient temperature is greater than the second preset temperature, step S02 is executed;

[0024] S02. The compressor is respectively communicated with the indoor heat exchanger and the outdoor heat exchanger through the valve assembly; the compressor is started, and the refrigerant pump is closed;

[0025] The flow direction of the refrigerant is: the exhaust port of the compressor - the outdoor heat exchanger - the indoor heat exchanger - the suction port of the compressor;

[0026] If the detected ambient temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, step S03 is executed;

[0027] S03. The compressor is respectively communicated with the indoor heat exchanger and the outdoor heat exchanger through the valve assembly; the compressor is started, the refrigerant pump is closed, and the refrigerant pump provides adjustable air supplement of gaseous refrigerant to the compressor;

[0028] If the detected ambient temperature is less than the first preset temperature, step S04 is executed;

[0029] S04. The refrigerant pump is respectively communicated with the indoor heat exchanger and the outdoor heat exchanger through the valve assembly; the refrigerant pump is started, and the compressor is closed;

[0030] The flow direction of the refrigerant is: the liquid outlet of the refrigerant pump - the indoor heat exchanger - the outdoor heat exchanger - the inlet of the refrigerant pump.

[0031] Optionally, the refrigeration system further includes a liquid storage tank, and the liquid storage tank is communicated with the inlet of the refrigerant pump; the valve assembly includes a four-way reversing valve, and the suction port of the compressor and the liquid storage tank are connected in parallel and then used to communicate with the second port of the four-way reversing valve, and the exhaust port of the compressor and the liquid outlet of the refrigerant pump are connected in parallel and then used to communicate with the first port of the four-way reversing valve; the indoor heat exchanger is used to communicate with the third port of the four-way reversing valve, and the outdoor heat exchanger is used to communicate with the fourth port of the four-way reversing valve;

[0032] In S02, the step of respectively communicating the compressor with the indoor heat exchanger and the outdoor heat exchanger through the valve assembly includes: powering off the four-way reversing valve to make the first port communicate with the fourth port and the second port communicate with the third port;

[0033] In S03, the steps of connecting the compressor to the indoor heat exchanger and the outdoor heat exchanger respectively through the valve assembly include: de-energizing the four-way reversing valve to make the first port communicate with the fourth port and the second port communicate with the third port;

[0034] In S04, the steps of connecting the refrigerant pump to the indoor heat exchanger and the outdoor heat exchanger respectively through the valve assembly include: energizing the four-way reversing valve to make the first port communicate with the third port and the second port communicate with the fourth port.

[0035] Optionally, the control method of the refrigeration system driven by the refrigerant pump further includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve. The first solenoid valve is arranged between the outlet of the refrigerant pump and the injection port of the compressor; the second solenoid valve is arranged between the suction port of the compressor and the second port; the third solenoid valve is arranged between the discharge port of the compressor and the first port; the fourth solenoid valve is arranged between the liquid storage tank and the second port; the fifth solenoid valve is arranged between the liquid outlet of the refrigerant pump and the first port;

[0036] In S02, the steps before starting the compressor further include: opening the second solenoid valve and the third solenoid valve, and closing the first solenoid valve, the fourth solenoid valve, and the fifth solenoid valve;

[0037] In S03, the steps before starting the compressor further include: opening the second solenoid valve, the third solenoid valve, and the first solenoid valve, and closing the fourth solenoid valve and the fifth solenoid valve;

[0038] In S04, the steps before starting the refrigerant pump further include: opening the fourth solenoid valve and the fifth solenoid valve, and closing the first solenoid valve, the second solenoid valve, and the third solenoid valve.

[0039] Optionally, the throttling device further includes a first throttling device and a second throttling device. The first throttling device is located between the outlet of the liquid storage tank and the inlet of the refrigerant pump and is respectively connected to the liquid storage tank and the refrigerant pump; the second throttling device is located between the indoor heat exchanger and the outdoor heat exchanger and is respectively connected to the indoor heat exchanger and the outdoor heat exchanger;

[0040] In S02, close the first throttling device and open and adjust the second throttling device;

[0041] In S03, open and adjust the first throttling device and at the same time open and adjust the second throttling device;

[0042] In S04 , the first throttling device is fully opened, and the second throttling device is fully opened at the same time.

[0043] The present invention provides a refrigerant pump-driven refrigeration system and a control method thereof. The refrigeration system has three operating modes and can switch between operating modes according to the ambient temperature. When the ambient temperature is higher than a second preset temperature, the system switches to a compressor operating mode, in which case the compressor supplies refrigerant to a heat exchanger. Furthermore, when the ambient temperature is lower than a first preset temperature, the system switches to a refrigerant pump operating mode, in which case the refrigerant pump supplies refrigerant to the heat exchanger.

[0044] The refrigeration system realizes the compound linkage operation of the refrigeration system through the compressor and the refrigerant pump, and can realize the effective switching between the compressor operation mode, the compressor air supply operation mode and the refrigerant pump operation mode through the valve assembly, thereby realizing efficient and reliable air-conditioning system and uninterrupted cooling throughout the year, thereby improving the annual energy efficiency ratio (AEER) and operational reliability of the refrigeration system.

[0045] In addition, the refrigeration system can switch to the compressor air replenishment operation mode when the ambient temperature is between the first preset temperature and the second preset temperature. At this time, the refrigerant pump can provide gaseous refrigerant to the compressor for air replenishment, so as to inject enthalpy into the compressor through the refrigerant pump, increase the refrigerant flow in the compressor, and thus solve the technical problems of low compressor suction pressure and small refrigerant flow in low temperature environment, ensure the normal startup and operation of the refrigeration system under different ambient temperatures, and thus improve the reliability, effectiveness and energy saving of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of a refrigeration system in a preferred embodiment of the present invention;

[0047] Figure 2 Schematic diagram of the structure of a refrigeration system in another preferred embodiment of the present invention, wherein direction a represents the flow direction of the refrigerant when the ambient temperature is greater than or equal to the first preset temperature;

[0048] Figure 3 This is a structural diagram of a refrigeration system in another preferred embodiment of the present invention, wherein direction b represents the flow direction of the refrigerant when the ambient temperature is lower than the first preset temperature;

[0049] Figure 4 A schematic structural diagram of a refrigerant pump in a preferred embodiment of the present invention;

[0050] Figure 5 This is a schematic structural diagram of a separation component in a refrigerant pump according to a preferred embodiment of the present invention;

[0051] Figure 6This is a flowchart of the control method for the refrigeration system in a preferred embodiment of the present invention.

[0052] In the figure:

[0053] Compressor 1; suction port 11; discharge port 12; injection port 13; indoor heat exchanger 2; outdoor heat exchanger 3; valve assembly 4; first port 41; second port 42; third port 43; fourth port 44; first solenoid valve 45; second solenoid valve 46; third solenoid valve 47; fourth solenoid valve 48; fifth solenoid valve 49; throttling device 5; first throttling device 51; second throttling device 52; refrigerant pump 6; inlet 61; outlet port 62; liquid outlet 63; pump body 64; separation assembly 65; suction pipe 651; suspension assembly 652; liquid level float 6521; upper limit member 6522; lower limit member 6523; housing 653; accommodation space 654; exhaust hole 655; liquid storage tank 7. Detailed implementation manners

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0055] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. Without conflict, the following embodiments and the features in the embodiments can be mutually supplemented or combined with each other.

[0056] As Figures 1 to 3 shown, a preferred embodiment of the present invention provides a refrigeration system driven by a refrigerant pump, including a compressor 1, an indoor heat exchanger 2 (such as an evaporator), an outdoor heat exchanger 3 (such as a condenser), a valve assembly 4, a throttling device 5, and a refrigerant pump 6. The compressor 1 and the refrigerant pump 6 are respectively connected to the outdoor heat exchanger 3 and the indoor heat exchanger 2 through the valve assembly 4 and the throttling device 5, and the refrigerant pump 6 is communicated with the compressor 1.

[0057] The refrigeration system realizes the switching of three operation modes of the refrigeration system through the control of the valve assembly 4 and the throttling device

[0058] When the ambient temperature T0 is greater than the second preset temperature T2, the refrigeration system switches to the compressor operation mode. In this mode, the compressor 1 supplies refrigerant to the outdoor heat exchanger 3. The flow direction of the refrigerant is: the discharge port 12 of the compressor 1 - the outdoor heat exchanger 3 - the indoor heat exchanger 2 - the suction port 11 of the compressor 1.

[0059] When the ambient temperature T0 is greater than or equal to the first preset temperature T1 and less than or equal to the second preset temperature T2, the refrigerant pump 6 supplies gaseous refrigerant to the compressor 1 for gas replenishment, and the refrigeration system switches to the compressor gas replenishment operation mode. The flow direction of the refrigerant is: the exhaust port 12 of the compressor 1 - the outdoor heat exchanger 3 - the indoor heat exchanger 2 - the suction port 11 of the compressor 1.

[0060] When the ambient temperature T0 is less than the first preset temperature T1, the refrigeration system switches to the refrigerant pump operation mode. In this mode, the refrigerant pump 6 supplies refrigerant to the indoor heat exchanger 2. The flow direction of the refrigerant is: the liquid outlet 63 of the refrigerant pump 6 - the indoor heat exchanger 2 - the outdoor heat exchanger 3 - the inlet of the refrigerant pump 6.

[0061] Specifically, any one of the compressor 1 and the refrigerant pump 6 can be selectively connected to the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4 and the throttling device 5 as needed, so as to supply refrigerant to the indoor heat exchanger 2 and / or the outdoor heat exchanger 3 through the compressor 1 or the refrigerant pump 6.

[0062] The present invention provides a refrigeration system driven by a refrigerant pump and its control method. The refrigeration system has three working modes and can switch working modes according to the ambient temperature T0. When the ambient temperature T0 is higher than the second preset temperature T2, it switches to the compressor operation mode, and at this time, the compressor 1 can supply refrigerant to the heat exchanger. At the same time, when the ambient temperature T0 is lower than the first preset temperature T1, it can switch to the refrigerant pump operation mode, and at this time, the refrigerant pump 6 can supply refrigerant to the heat exchanger.

[0063] The refrigeration system realizes the combined linkage operation of the refrigeration system through the compressor 1 and the refrigerant pump 6, and can effectively switch between the compressor operation mode and the refrigerant pump operation mode through the valve assembly 4, thereby realizing the efficient and reliable operation of the air-conditioning system without interruption throughout the year, and improving the annual energy efficiency ratio (abbreviation: AEER) and the operation reliability of the refrigeration system.

[0064] At the same time, the refrigeration system can switch to the compressor gas replenishment operation mode when the ambient temperature T0 is between the first preset temperature T1 and the second preset temperature T2. At this time, the refrigerant pump 6 can supply gaseous refrigerant to the compressor 1, so as to inject enthalpy increase into the compressor 1 through the refrigerant pump 6, increase the refrigerant flow rate in the compressor 1, and then solve the technical problems of lower suction pressure of the compressor 1 and smaller refrigerant flow rate in a low-temperature environment, ensure the normal start-up operation of the refrigeration system under different ambient temperatures, and further improve the reliability, effectiveness and energy saving of the refrigeration system.

[0065] The present application does not limit the specific type of the compressor 1. In a preferred example, the compressor 1 is a rolling rotor type jet enthalpy compressor. In other examples, the compressor 1 can also be other types of compressors, such as a twin rotor compressor.

[0066] As a preferred embodiment, the valve assembly 4 includes a four-way reversing valve. The suction port 11 of the compressor 1 and the inlet of the refrigerant pump 6 are connected in parallel and then used to communicate with the second port 42 of the four-way reversing valve. The discharge port 12 of the compressor 1 and the liquid outlet 63 of the refrigerant pump 6 are connected in parallel and then used to communicate with the first port 41 of the four-way reversing valve. The indoor heat exchanger 2 is used to communicate with the third port 43 of the four-way reversing valve, and the outdoor heat exchanger 3 is used to communicate with the fourth port 44 of the four-way reversing valve.

[0067] Refer to Figure 2 and Figure 3 As shown, in a specific embodiment, the suction port 11 of the compressor 1 and the inlet 61 of the refrigerant pump 6 are connected in parallel and then connected to the L port of the four-way reversing valve. The discharge port 12 of the compressor 1 and the liquid outlet 63 of the refrigerant pump 6 are connected in parallel and then connected to the H port of the four-way reversing valve. The indoor heat exchanger 2 is connected to the E port of the four-way reversing valve, and the outdoor heat exchanger 3 is connected to the C port of the four-way reversing valve.

[0068] During actual operation, in the compressor operation mode and the compressor gas injection operation mode of the refrigeration system, by conducting the first port 41 and the fourth port 44 (i.e., conducting the H port and the C port), and conducting the second port 42 and the third port 43 (i.e., conducting the L port and the E port), the connection between the compressor 1 and the indoor heat exchanger 2 and the indoor heat exchanger 3 can be achieved. At this time, the refrigerant pump 6 is disconnected from both the indoor heat exchanger 2 and the indoor heat exchanger 3.

[0069] In the refrigerant pump operation mode of the refrigeration system, by conducting the first port 41 and the third port 43 (i.e., conducting the H port and the E port), and conducting the second port 42 and the fourth port 44 (i.e., conducting the L port and the C port), the connection between the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3 can be achieved. At this time, the compressor 1 is disconnected from both the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0070] Continue to refer to Figure 2 and Figure 3As shown, the valve assembly 4 further includes a second solenoid valve 46, a third solenoid valve 47, a fourth solenoid valve 48, and a fifth solenoid valve 49. The second solenoid valve 46 is disposed between the compressor 1 and the second port 42, and the third solenoid valve 47 is disposed between the compressor 1 and the first port 41. That is to say, the second solenoid valve 46 is installed at the suction port 11 of the compressor 1, and the third solenoid valve 47 is installed at the discharge port 12 of the compressor 1. The fourth solenoid valve 48 is disposed between the refrigerant pump 6 and the second port 42, and the fifth solenoid valve 49 is disposed between the liquid outlet 63 of the refrigerant pump 6 and the first port 41. That is to say, the fifth solenoid valve 49 is installed at the liquid outlet 63 of the refrigerant pump 6.

[0071] The operator can control the connection or disconnection between any one of the compressor 1 and the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the corresponding solenoid valves.

[0072] Specifically, in the compressor operation mode and the compressor gas supplement operation mode of the refrigeration system, the second solenoid valve 46 and the third solenoid valve 47 can be opened, and the fourth solenoid valve 48 and the fifth solenoid valve 49 can be closed to achieve the connection between the compressor 1 and the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the disconnection between the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3. In the refrigerant pump operation mode of the refrigeration system, the fourth solenoid valve 48 and the fifth solenoid valve 49 can be opened, and the second solenoid valve 46 and the third solenoid valve 47 can be closed to achieve the connection between the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the disconnection between the compressor 1 and the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0073] Continue to refer to Figure 2 and Figure 3 As shown, the gas outlet 62 of the refrigeration pump 6 is communicated with the injection port 13 of the compressor 1. The valve assembly 4 further includes a first solenoid valve 45, and the first solenoid valve 45 is disposed between the gas outlet 62 of the refrigerant pump 6 and the injection port 13 of the compressor 1, that is, the first solenoid valve 45 is installed at the inlet of the injection port 13 of the compressor 1. The refrigerant pump 6 is used to supply gaseous refrigerant to the compressor 1 for gas supplement after the first solenoid valve 45 is opened. In the compressor gas supplement operation mode of the refrigeration system, the first solenoid valve 45 can be opened to enable the refrigerant pump 6 to supply gaseous refrigerant to the compressor 1, thereby increasing the refrigerant flow rate in the compressor 1.

[0074] Furthermore, the refrigeration system driven by the refrigerant pump 6 further includes a liquid storage tank 7. The liquid storage tank 7 is disposed between the second port 42 of the four-way reversing valve and the inlet 61 of the refrigerant pump 6. The fourth solenoid valve 48 is disposed between the liquid storage tank 7 and the second port 42. The inlet of the liquid storage tank 7 can be selectively communicated with the indoor heat exchanger 2 or the outdoor heat exchanger 3 through the valve assembly 4. The outlet of the liquid storage tank 7 is communicated with the inlet of the refrigerant pump 6. The liquid storage tank 7 is used to supply refrigerant to the refrigerant pump 6 when the ambient temperature is less than or equal to the second preset temperature T2.

[0075] Referring to Figure 1 As shown, the throttling device 5 further includes a first throttling device 51. The first throttling device 51 is located between the outlet of the liquid storage tank 7 and the inlet 61 of the refrigerant pump 6 and is respectively communicated with the liquid storage tank 6 and the refrigerant pump 6. At this time, the first throttling device 51 can play a role in closing or opening to adjust the refrigerant pressure and flow rate between the liquid storage tank 7 and the refrigerant pump 6, and further adjust the gas-liquid state, flow rate and pressure of the refrigerant by fully opening or adjusting the first throttling device 51.

[0076] Further preferably, the throttling device 5 further includes a second throttling device 52. The second throttling device 52 is located between the indoor heat exchanger 2 and the outdoor heat exchanger 3 and is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3. At this time, the second throttling device 52 can play a role in closing or opening to adjust the refrigerant pressure and flow rate between the indoor heat exchanger 2 and the outdoor heat exchanger 3, and further adjust the gas-liquid state, flow rate and pressure of the refrigerant by fully opening or adjusting the second throttling device 52.

[0077] The present application does not limit the specific types of the first throttling device 51 and the second throttling device 52. The first throttling device 51 and the second throttling device 52 include but are not limited to electronic expansion valves, throttle valves or expansion valves.

[0078] Furthermore, the refrigerant pump 6 includes a pump body 64 and a separation component 65 (refer to Figure 2 and Figure 3 ), the separation component 65 is communicated with the pump body 64, and an air outlet 62 of the refrigerant pump 6 and an inlet 61 of the refrigerant pump 6 are arranged on the separation component 65 (refer to Figure 4 and Figure 5 ), and a liquid outlet 63 of the refrigerant pump 6 is arranged on the pump body 64. The inlet 61 is communicated with the liquid storage tank 7, the air outlet 62 is communicated with the injection port 13 of the compressor 1, and the liquid outlet 63 is communicated with the first port 41. The liquid storage tank 7 is used to supply gas-liquid refrigerant to the separation component 65.

[0079] In the compressor air supplement operation mode, the separation component 65 is used to supply gaseous refrigerant to the compressor 1 for air supplement. In the refrigerant pump operation mode, the separation component 65 is used to supply liquid refrigerant to the pump body 64.

[0080] Configured in this way, the separation component 65 can deliver gaseous refrigerant to the injection port 13 of the compressor 1 to supplement the gaseous refrigerant of the compressor 1, ensure the required amount of gaseous refrigerant of the compressor 1, and prevent liquid carryover during the suction of the compressor 1.

[0081] Further, the refrigerant pump 6 further includes a motor (not labeled). The motor and the pump body 64 are connected by an eccentric crankshaft. The motor and the pump body 64 are integrally encapsulated in a housing. The pump body 64 increases the pressure of the flowing liquid refrigerant through volume change.

[0082] Specifically, the pump body 64 is composed of main components such as a cylinder, a piston, an eccentric crankshaft, upper and lower cylinder heads, and blades (not shown). The long shaft of the crankshaft is connected to the motor rotor, and the motor drives the crankshaft to rotate. The piston is mounted on the eccentric part of the crankshaft and rolls along the inner wall of the cylinder, forming a crescent-shaped working chamber with the cylinder. The blade is forced by the spring to keep its end in close contact with the piston, thereby dividing the crescent-shaped working chamber into two parts: an inhalation chamber and a compression and discharge chamber. The refrigerant liquid is sucked from the input pipe into an expanding cavity, and then as the volume shrinks, the liquid refrigerant is pushed and obtains a certain lift head and is discharged from the pump body 64 into the output pipe.

[0083] Refer to Figure 4 and Figure 5 As shown, as a preferred embodiment, the separation component 65 includes an intake pipe 651, a suspension component 652, and a housing 653. The air outlet 62 is provided at the upper port of the intake pipe 651 located outside the housing 653. The housing 653 has an accommodation space 654 for accommodating gaseous refrigerant and liquid refrigerant. The intake pipe 651 is partially inserted into the accommodation space 654. The lower end surface of the intake pipe 651 is higher than the initial liquid refrigerant level in the accommodation space 654 and is used to deliver the gaseous refrigerant in the accommodation space 654 to the compressor 1. An exhaust hole 655 is provided on a section of the intake pipe 651 located inside the accommodation space 654.

[0084] Refer to Figure 5 As shown, the suspension component 652 includes a liquid level float 6521. At this time, the exhaust hole 655 can be controlled to open and close by the liquid level float 6521 to prevent liquid refrigerant from entering and damaging the compressor 1.

[0085] Further, the liquid level float 6521 is movably connected to the intake pipe 651, and the liquid level float 6521 can move relative to the intake pipe 651 and block the exhaust hole 655 when the liquid level of the liquid refrigerant rises.

[0086] Specifically, when the liquid level rises, the liquid level float 6521 moves upward, and the exhaust hole 655 is gradually closed to prevent liquid refrigerant from entering the compressor 1 and causing liquid hammer to the compressor 1. When the liquid level drops, the liquid level float 6521 drops to open the exhaust hole 655.

[0087] Reference Figure 5 As shown, the separation assembly 65 also includes an upper limit member 6522 and a lower limit member 6523, both of which are connected to the suction pipe 651. The upper limit member 6522 is used to limit the upper limit position of the movement of the liquid level float 6521, and the lower limit member 6523 is used to limit the lower limit position of the movement of the liquid level float 6521.

[0088] In a specific example, the suction pipe 651 is inserted into the accommodating space 654 on the side opposite to the liquid refrigerant level in the separation assembly 65. Preferably, the upper limit member 6522 can be configured as a limit spring, and the lower limit member 6523 can be configured as a limit plate. The limit spring is sleeved on the suction pipe 651, and the limit plate is connected to the suction pipe 651 and fixed to the lower end of the suction pipe 651 away from the exhaust hole 655.

[0089] When the liquid level in the separation assembly 65 rises, the liquid level float 6521 contacts the limit spring and stops rising, at which point the liquid level float 6521 can block the vent 655. When the liquid level in the separation assembly 65 drops, the liquid level float 6521 falls back onto the limit plate, thereby opening the vent 655.

[0090] In the prior art, when the ambient temperature is low, the refrigerant with a low temperature entering the indoor heat exchanger 2 can cause frost. In this case, the condensation temperature of the refrigerant can generally be maintained and increased by turning off the fan of the outdoor heat exchanger 3. However, when the fan of the outdoor heat exchanger 3 is stopped, a large amount of liquid refrigerant in the outdoor heat exchanger 3 will flow into the compressor 1, diluting the lubricating oil in the compressor 1 and thus shortening the service life of the compressor 1. At the same time, if the compressor 1 is operating normally for cooling, the low outdoor ambient temperature will cause the evaporation pressure of the refrigerant sucked into the compressor 1 to be too low, resulting in a large suction specific volume, resulting in a low refrigerant flow rate entering the compressor 1, affecting the cooling effect of the compressor 1.

[0091] Reference Figure 6 As shown, combined with Figures 1 to 3 A preferred embodiment of the present invention further provides a control method for a refrigerant pump-driven refrigeration system, which is applicable to any of the refrigerant pump-driven refrigeration systems described above. The control method for a refrigerant pump-driven refrigeration system comprises the following steps:

[0092] S01. The refrigeration system is turned on, the ambient temperature T0 is dynamically detected, and the temperature range to which the ambient temperature T0 belongs is determined, and corresponding steps are executed according to the temperature range.

[0093] If the detected ambient temperature T0 is greater than the second preset temperature T2, that is, when T0>T2, it means that the ambient temperature T0 is high, and the compressor 1 needs to be turned on, the refrigerant pump 6 needs to be turned off, and step S02 is executed;

[0094] S02. The compressor 1 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4. The compressor 1 is turned on and the refrigerant pump 6 is turned off. The compressor 1 operates normally, and the refrigeration system enters the compressor operation mode.

[0095] If it is detected that the ambient temperature T0 is greater than or equal to the first preset temperature T1 and less than or equal to the second preset temperature T2, that is, when T1 ≤ T0 ≤ T2, it indicates that the ambient temperature is slightly low. At this time, the compressor 1 needs to be turned on, the refrigerant pump 6 needs to be turned off, and step S03 is executed.

[0096] S03. The compressor 1 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4. The compressor 1 is turned on and the refrigerant pump 6 is turned off. The compressor 1 operates normally, and the refrigerant pump 6 provides adjustable supplementary gas of gaseous refrigerant to the compressor 1, and the refrigeration system enters the compressor supplementary gas operation mode.

[0097] Referring to Figure 2 In the a direction in, in step S02 and step S03, the flow direction of the refrigerant is: the exhaust port 12 of the compressor 1 - the outdoor heat exchanger 3 - the indoor heat exchanger 2 - the suction port 11 of the compressor 1. At this time, the high-temperature and high-pressure gaseous refrigerant is discharged from the compressor 1, then enters the outdoor heat exchanger 3 for condensation and then enters the indoor heat exchanger 2 for endothermic evaporation, and then enters the compressor 1 from the suction port 11 of the compressor 1 again.

[0098] If it is detected that the ambient temperature T0 is less than the first preset temperature T1, that is, when T0 < T1, it indicates that the ambient temperature is very low. At this time, the refrigerant pump 6 needs to be turned on, the compressor 1 needs to be turned off, and step S04 is executed.

[0099] S04. The refrigerant pump 6 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4. The refrigerant pump 6 is turned on and the compressor 1 is turned off. The refrigerant pump 6 operates normally to transport refrigerant into the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the refrigerant pump 6, and the refrigeration system enters the refrigerant pump operation mode.

[0100] Referring to Figure 3 In the b direction in, the flow direction of the refrigerant is: the liquid outlet 63 of the refrigerant pump 6 - the indoor heat exchanger 2 - the outdoor heat exchanger 3 - the inlet 61 of the refrigerant pump 6. In this case, the outdoor natural cold source is used to cool the liquid refrigerant in the outdoor heat exchanger 3 and make the liquid refrigerant enter the refrigerant pump 6. The refrigerant pump 6 transports the liquid refrigerant (or gas-liquid refrigerant) to the indoor heat exchanger 2 for endothermic evaporation, and then the refrigerant flows from the indoor heat exchanger 2 to the outdoor heat exchanger 3 for condensation and heat release to complete the cycle.

[0101] The control method of the refrigeration system can achieve the combined linkage operation of the refrigeration system through the valve assembly 4, so as to realize the effective switching between the compressor operation mode, the compressor gas supplement operation mode and the refrigerant pump operation mode, and then ensure the efficient and reliable operation of the air conditioning system, continuous refrigeration throughout the year, and improve the annual energy efficiency ratio (abbreviation: AEER) and operation reliability of the refrigeration system.

[0102] In the compressor gas supplement operation mode of the refrigeration system, the refrigerant pump 6 supplies gaseous refrigerant to the compressor 1 for gas supplement, so as to inject enthalpy increase into the compressor 1 through the refrigerant pump 6, and then increase the refrigerant flow rate in the compressor 1.

[0103] Furthermore, the valve assembly 4 includes a four-way reversing valve. In steps S02 and S03, the steps of connecting the compressor 1 to the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4 include: powering off the four-way reversing valve to make the first port 41 communicate with the fourth port 44 (i.e., the H port communicates with the C port), and the second port 42 communicate with the third port 43 (i.e., the L port communicates with the E port), so as to realize the connection between the compressor 1 and the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the disconnection between the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0104] In S04, the steps of connecting the refrigerant pump 6 to the indoor heat exchanger 2 and the outdoor heat exchanger 3 through the valve assembly 4 include: powering on the four-way reversing valve to switch the refrigerant passage, so that the first port 41 communicates with the third port 43 (i.e., the H port and the E port communicate), and the second port 42 communicates with the fourth port 44 (i.e., the L port and the C port communicate), so as to realize the connection between the refrigerant pump 6 and the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the disconnection between the compressor 1 and the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0105] Preferably, in S02, that is, when T0 > T2, the steps before starting the compressor 1 further include: opening the second solenoid valve 46 and the third solenoid valve 47, and closing the first solenoid valve 45, the fourth solenoid valve 48 and the fifth solenoid valve 49. In this way, the compressor 1 can be connected to the refrigeration system through the corresponding solenoid valves, and at this time, the refrigeration system enters the compressor operation mode.

[0106] In S03, that is, when T1 ≤ T0 ≤ T2, the steps before starting the compressor 1 further include: opening the second solenoid valve 46, the third solenoid valve 47 and the first solenoid valve 45, and closing the fourth solenoid valve 48 and the fifth solenoid valve 49. In this case, the refrigerant pump 6 can be used to supply gaseous refrigerant to the compressor 1, and at this time, the refrigeration system enters the compressor gas supplement operation mode.

[0107] In S04, that is, when T0 < T1, the steps before starting the refrigerant pump 6 further include: opening the fourth solenoid valve 48 and the fifth solenoid valve 49, and closing the first solenoid valve 45, the second solenoid valve 46, and the third solenoid valve 47. In this way, the refrigerant pump 6 can be connected to the refrigeration system through the corresponding solenoid valves, and at this time, the refrigeration system enters the refrigerant pump operation mode.

[0108] Preferably, in S02, that is, when T0 > T2, the first throttling device 51 is closed to disconnect the liquid storage tank 7 and the refrigerant pump 6. The second throttling device 52 is opened and adjusted to enable the refrigerant to flow between the indoor heat exchanger 2 and the outdoor heat exchanger 3.

[0109] In S03, that is, when T1 ≤ T0 ≤ T2, the first throttling device 51 can be opened and adjusted to enable the refrigerant to flow between the liquid storage tank 7 and the refrigerant pump 6, and to adjust the gas-liquid state, flow rate, and pressure of the refrigerant. Then, gaseous refrigerant is injected into the compressor 1 through the refrigerant pump 6. At the same time, the second throttling device 52 is opened and adjusted.

[0110] In S04, that is, when T0 < T1, the first throttling device 51 is fully opened to enable the refrigerant to flow between the liquid storage tank 7 and the refrigerant pump 6. At the same time, the second throttling device 52 is fully opened to enable the refrigerant to flow between the indoor heat exchanger 2 and the outdoor heat exchanger 3 under the drive of the refrigerant pump 6.

[0111] Preferably, a third preset temperature T3 can also be set, and the third preset temperature T3 is less than the first preset temperature T1. When T3 < T0 < T1, the fourth solenoid valve 48 and the fifth solenoid valve 49 are opened, the first solenoid valve 45, the second solenoid valve 46, and the third solenoid valve 47 are closed, the first throttling device 51 and the second throttling device 52 are fully opened, the refrigerant pump 6 is started, and the compressor 1 is closed to achieve the refrigerant pump operation mode of the refrigeration system.

[0112] Preferably, a fourth preset temperature T4 can also be set, and the fourth preset temperature T4 is greater than the second preset temperature T2. When T2 < T0 < T4, the second solenoid valve 46 and the third solenoid valve 47 are opened, the first solenoid valve 45, the fourth solenoid valve 48, and the fifth solenoid valve 49 are closed, the first throttling device 51 is closed, the second throttling device 52 is opened, the compressor 1 is started, and the refrigerant pump 6 is closed. The second throttling device 52 is adjusted according to the working conditions to achieve the compressor operation mode of the refrigeration system.

[0113] As a specific example, the first preset temperature T1 can be set at about 0 °C, the second preset temperature T2 can be set at about 15 °C, the third preset temperature T3 can be set at about -35 °C, and the fourth preset temperature T4 can be set at about 55 °C.

[0114] In a non-limiting embodiment, the control method of a refrigeration system driven by a refrigeration pump may include the following steps:

[0115] When the refrigeration system is powered on, dynamically detect the ambient temperature T0, determine the temperature range to which the ambient temperature T0 belongs, and execute corresponding steps according to the belonging temperature range.

[0116] When the ambient temperature 15°C < T0 < 55°C, de-energize the four-way reversing valve. At this time, the first port 51 is communicated with the fourth port 54, and the second port 52 is communicated with the third port 53, so that the compressor 1 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the refrigerant pump 6 is disconnected from the indoor heat exchanger 2 and the outdoor heat exchanger 3. Open the second solenoid valve 46 and the third solenoid valve 47, and close the first solenoid valve 45, the fourth solenoid valve 48 and the fifth solenoid valve 49. Close the first throttling device 51 and open the second throttling device 52. Then start the compressor 1 and stop the refrigerant pump 6, and adjust the second throttling device 52 according to the working conditions. At this time, the refrigeration system enters the compressor operation mode.

[0117] When 0°C ≤ T0 ≤ 15°C, de-energize the four-way reversing valve. At this time, the first port 51 is communicated with the fourth port 54, and the second port 52 is communicated with the third port 53, so that the compressor 1 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the refrigerant pump 6 is disconnected from the indoor heat exchanger 2 and the outdoor heat exchanger 3. Open the first solenoid valve 45, the second solenoid valve 46 and the third solenoid valve 47, and the refrigerant pump 6 is communicated with the compressor 1. Close the fourth solenoid valve 48 and the fifth solenoid valve 49. Open the first throttling device 51 to communicate the liquid storage tank 7 with the refrigerant pump 6. At the same time, open the second throttling device 52. Then start the compressor 1 and stop the refrigerant pump 6, and adjust the second throttling device 52 and the first throttling device 51 according to the working conditions. The refrigerant pump 6 can supply gaseous refrigerant to the compressor 1 for air supplement. At this time, the refrigeration system enters the compressor air supplement operation mode.

[0118] When -35°C < T0 < 0°C, energize the four-way reversing valve. At this time, the first port 51 is communicated with the third port 53, and the second port 52 is communicated with the fourth port 54, so that the refrigerant pump 6 is respectively communicated with the indoor heat exchanger 2 and the outdoor heat exchanger 3, and the compressor 1 is disconnected from the indoor heat exchanger 2 and the outdoor heat exchanger 3. Open the fourth solenoid valve 48 and the fifth solenoid valve 49, and close the first solenoid valve 45, the second solenoid valve 46 and the third solenoid valve 47. Completely open the first throttling device 51 and at the same time completely open the second throttling device 52. Then start the refrigerant pump 6 and stop the compressor 1. At this time, the refrigeration system enters the refrigerant pump operation mode.

[0119] In summary, the present invention provides a refrigerant pump-driven refrigeration system and its control method. The refrigeration system has three operating modes and can switch the operating mode according to the ambient temperature T0. When the ambient temperature T0 is higher than the second preset temperature T2, it switches to the compressor operation mode. At this time, refrigerant can be provided to the heat exchanger through the compressor 1. When the ambient temperature T0 is between the first preset temperature T1 and the second preset temperature T2, it switches to the compressor gas injection operation mode. At this time, gaseous refrigerant can be provided to the compressor 1 through the refrigerant pump 6 to inject enthalpy increase into the compressor 1 through the refrigerant pump 6, increasing the refrigerant flow rate in the compressor 1, thereby solving the technical problems of low suction pressure and small refrigerant flow rate of the compressor 1 in a low-temperature environment. When the ambient temperature T0 is lower than the first preset temperature T1, it switches to the refrigerant pump operation mode. At this time, refrigerant can be provided to the heat exchanger through the refrigerant pump 6.

[0120] The refrigeration system realizes the combined and linked operation of the refrigeration system through the compressor 1 and the refrigerant pump 6, and can effectively switch between the compressor operation mode, the compressor gas injection operation mode, and the refrigerant pump operation mode through the valve assembly 4. Subsequently, it can achieve efficient and reliable year-round uninterrupted refrigeration of the air-conditioning system, improving the annual energy efficiency ratio (abbreviation: AEER) and the reliability of operation of the refrigeration system.

[0121] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A refrigerant pump-driven refrigeration system, characterized in that, It includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a refrigerant pump, a valve assembly, and a throttling device; the compressor and the refrigerant pump are respectively connected to the outdoor heat exchanger and the indoor heat exchanger through the valve assembly and the throttling device, and the refrigerant pump is communicated with the compressor; the control of the valve assembly and the throttling device realizes the switching of three operating modes of the refrigeration system: When the ambient temperature is greater than the second preset temperature, the refrigeration system switches to the compressor operating mode; When the ambient temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the refrigerant pump supplies gaseous refrigerant to the compressor for gas replenishment, and the refrigeration system switches to the compressor gas replenishment operating mode; When the ambient temperature is less than the first preset temperature, the refrigeration system switches to the refrigerant pump operating mode.

2. The refrigerant pump-driven refrigeration system according to claim 1, characterized in that, The valve assembly includes a four-way reversing valve. The suction port of the compressor and the inlet of the refrigerant pump are connected in parallel and then used to communicate with the second port of the four-way reversing valve. The discharge port of the compressor and the liquid outlet of the refrigerant pump are connected in parallel and then used to communicate with the first port of the four-way reversing valve; the indoor heat exchanger is used to communicate with the third port of the four-way reversing valve, and the outdoor heat exchanger is used to communicate with the fourth port of the four-way reversing valve.

3. The refrigerant pump-driven refrigeration system according to claim 2, wherein The valve assembly further includes a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve. The second solenoid valve is arranged between the compressor and the second port, the third solenoid valve is arranged between the compressor and the first port, the fourth solenoid valve is arranged between the refrigerant pump and the second port, and the fifth solenoid valve is arranged between the liquid outlet of the refrigerant pump and the first port.

4. The refrigerant pump-driven refrigeration system according to claim 3, wherein The valve assembly further includes a first solenoid valve. The first solenoid valve is arranged between the gas outlet of the refrigerant pump and the injection port of the compressor. The refrigerant pump is used to supply gaseous refrigerant to the compressor for gas replenishment after the first solenoid valve is opened.

5. The refrigerant pump-driven refrigeration system according to any one of claims 1 to 4, characterized in that, The refrigerant pump includes a pump body and a separation component. The separation component is communicated with the pump body. The gas outlet of the refrigerant pump and the inlet of the refrigerant pump are arranged on the separation component, and the liquid outlet of the refrigerant pump is arranged on the pump body.

6. The refrigerant pump-driven refrigeration system according to claim 5, characterized in that, In the compressor gas replenishment operating mode, the separation component is used to supply gaseous refrigerant to the compressor for gas replenishment; in the refrigerant pump operating mode, the separation component is used to supply liquid refrigerant to the pump body.

7. The refrigerant pump-driven refrigeration system according to claim 3 or 4, characterized in that, It further includes a liquid storage tank. The liquid storage tank is arranged between the second port of the four-way reversing valve and the inlet of the refrigerant pump. The fourth solenoid valve is arranged between the liquid storage tank and the second port; the inlet of the liquid storage tank can be selectively communicated with the indoor heat exchanger or the outdoor heat exchanger through the valve assembly. The outlet of the liquid storage tank is communicated with the inlet of the refrigerant pump. The liquid storage tank is used to supply refrigerant to the refrigerant pump when the ambient temperature is less than or equal to the second preset temperature.

8. The refrigerant pump-driven refrigeration system according to claim 7, characterized in that, The throttling device includes a first throttling device, which is located between the outlet of the liquid storage tank and the inlet of the refrigerant pump and is respectively communicated with the liquid storage tank and the refrigerant pump.

9. The refrigerant pump-driven refrigeration system according to claim 5, wherein, The separation component includes an intake pipe, a suspension component and a housing. There is an accommodation space in the housing for accommodating gaseous refrigerant and liquid refrigerant. The air outlet is arranged on the intake pipe. The intake pipe is partially inserted into the accommodation space. The lower end surface of the intake pipe is higher than the initial liquid refrigerant level in the accommodation space and is used for transporting the gaseous refrigerant in the accommodation space to the compressor. The suspension component includes a liquid level float, which is movably connected to the intake pipe. The liquid level float can move relative to the intake pipe when the liquid level of the liquid refrigerant rises and block the air outlet.

10. The refrigerant pump-driven refrigeration system according to claim 9, wherein, The separation component further includes an upper limit member and a lower limit member, both of which are connected to the intake pipe. The upper limit member is used to define the upper limit position of the movement of the liquid level float, and the lower limit member is used to define the lower limit position of the movement of the liquid level float.

11. The refrigerant pump-driven refrigeration system according to claim 1, characterized in that, The throttling device further includes a second throttling device, which is located between the indoor heat exchanger and the outdoor heat exchanger and is respectively communicated with the indoor heat exchanger and the outdoor heat exchanger.

12. A control method for a refrigerant pump-driven refrigeration system, characterized in that, It is applicable to the refrigerant pump-driven refrigeration system according to any one of claims 1 to 11. The control method of the refrigerant pump-driven refrigeration system includes the following steps: S01. When the refrigeration system is started, dynamically detect the ambient temperature, judge the temperature range to which the ambient temperature belongs, and execute corresponding steps according to the belonging temperature range. If the detected ambient temperature is greater than the second preset temperature, execute step S02. S02. Through the valve assembly, make the compressor communicate with the indoor heat exchanger and the outdoor heat exchanger respectively; start the compressor and close the refrigerant pump. The flow direction of the refrigerant is: the exhaust port of the compressor - the outdoor heat exchanger - the indoor heat exchanger - the suction port of the compressor. If the detected ambient temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, execute step S03. S03. Through the valve assembly, make the compressor communicate with the indoor heat exchanger and the outdoor heat exchanger respectively; start the compressor and close the refrigerant pump. The refrigerant pump provides adjustable air supplement of gaseous refrigerant to the compressor. If the detected ambient temperature is less than the first preset temperature, execute step S04. S04. Through the valve assembly, make the refrigerant pump communicate with the indoor heat exchanger and the outdoor heat exchanger respectively; start the refrigerant pump and close the compressor. The flow direction of the refrigerant is: the liquid outlet of the refrigerant pump - the indoor heat exchanger - the outdoor heat exchanger - the inlet of the refrigerant pump.

13. The control method of the refrigerant pump-driven refrigeration system according to claim 12, characterized in that, It further includes a liquid storage tank which is communicated with the inlet of the refrigerant pump; the valve assembly includes a four-way reversing valve. The suction port of the compressor and the liquid storage tank are in parallel and then used to be communicated with the second port of the four-way reversing valve. The discharge port of the compressor and the liquid outlet of the refrigerant pump are in parallel and then used to be communicated with the first port of the four-way reversing valve; the indoor heat exchanger is used to be communicated with the third port of the four-way reversing valve, and the outdoor heat exchanger is used to be communicated with the fourth port of the four-way reversing valve; In S02, the steps of making the compressor communicate with the indoor heat exchanger and the outdoor heat exchanger respectively through the valve assembly include: powering off the four-way reversing valve so that the first port is communicated with the fourth port, and the second port is communicated with the third port; In S03, the steps of making the compressor communicate with the indoor heat exchanger and the outdoor heat exchanger respectively through the valve assembly include: powering off the four-way reversing valve so that the first port is communicated with the fourth port, and the second port is communicated with the third port; In S04, the steps of making the refrigerant pump communicate with the indoor heat exchanger and the outdoor heat exchanger respectively through the valve assembly include: powering on the four-way reversing valve so that the first port is communicated with the third port, and the second port is communicated with the fourth port.

14. The control method of the refrigerant pump-driven refrigeration system according to claim 13, characterized in that, It also includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a fifth solenoid valve. The first solenoid valve is arranged between the gas outlet of the refrigerant pump and the injection port of the compressor. The second solenoid valve is arranged between the suction port of the compressor and the second port. The third solenoid valve is arranged between the discharge port of the compressor and the first port. The fourth solenoid valve is arranged between the liquid storage tank and the second port. The fifth solenoid valve is arranged between the liquid outlet of the refrigerant pump and the first port; In S02, the steps before starting the compressor further include: opening the second solenoid valve and the third solenoid valve, and closing the first solenoid valve, the fourth solenoid valve and the fifth solenoid valve; In S03, the steps before starting the compressor further include: opening the second solenoid valve, the third solenoid valve and the first solenoid valve, and closing the fourth solenoid valve and the fifth solenoid valve; In S04, the steps before starting the refrigerant pump further include: opening the fourth solenoid valve and the fifth solenoid valve, and closing the first solenoid valve, the second solenoid valve and the third solenoid valve.

15. The control method of the refrigerant pump-driven refrigeration system according to claim 14, characterized in that, The throttling device further includes a first throttling device and a second throttling device. The first throttling device is located between the outlet of the liquid storage tank and the inlet of the refrigerant pump and is communicated with the liquid storage tank and the refrigerant pump respectively; the second throttling device is located between the indoor heat exchanger and the outdoor heat exchanger and is communicated with the indoor heat exchanger and the outdoor heat exchanger respectively; In S02, close the first throttling device and open and adjust the second throttling device; In S03, open and adjust the first throttling device and at the same time open and adjust the second throttling device; In S04, the first throttling device is fully opened while the second throttling device is also fully opened.

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