Refrigeration system and air conditioning

Abstract

The present application provides a refrigeration system and air conditioner. The refrigeration system includes a compressor, a condenser, an evaporator, a gas-liquid separator, a subcooler, a first throttle, a second throttle and a third throttle, the compressor outlet is connected to the condenser inlet, the condenser outlet is respectively connected to the first inlet of the gas-liquid separator and the second inlet of the evaporator, the first outlet and the second outlet of the gas-liquid separator are respectively connected to the first inlet of the evaporator and the first inlet of the subcooler, the first outlet of the subcooler and the evaporator outlet are respectively connected to the compressor inlet; the first throttle is connected between the first outlet of the subcooler and the compressor inlet, the second throttle is connected between the outlet of the condenser and the first inlet of the gas-liquid separator, and the third throttle is connected between the outlet of the condenser and the second inlet of the evaporator. The present application can realize the switching between the air-injection enthalpy-increasing refrigeration mode and the normal refrigeration mode by controlling the opening and closing states of the first throttle, the second throttle and the third throttle.

Description

Technical Field

[0001] The present application belongs to the technical field of air conditioning, and in particular relates to a refrigeration system and an air conditioner. Background Art

[0002] Air-supply and enthalpy-increasing air-conditioning and refrigeration systems are widely used in areas with harsh working conditions. However, in areas with obvious seasonal temperature changes, if the air-conditioning and refrigeration system still operates in the air-supply and enthalpy-increasing mode when the temperature is relatively moderate, it will not only fail to play its advantages, but will also cause the compressor to consume too much energy, which is not conducive to air-conditioning energy saving. Utility Model Content

[0003] The embodiments of the present application provide a refrigeration system and an air conditioner to solve the problem that the existing air-supply enthalpy-increasing air-conditioning refrigeration system still operates in the air-supply enthalpy-increasing mode under moderate working conditions, which is not conducive to energy saving.

[0004] In a first aspect, an embodiment of the present application provides a refrigeration system, which includes a compressor, a condenser, an evaporator, a gas-liquid separator, a subcooler, a first throttle, a second throttle and a third throttle; the outlet of the compressor is connected to the inlet of the condenser, and the outlet of the condenser is respectively connected to the first inlet of the gas-liquid separator and the second inlet of the evaporator, the first outlet and the second outlet of the gas-liquid separator are respectively connected to the first inlet of the evaporator and the first inlet of the subcooler, and the first outlet of the subcooler and the outlet of the evaporator are respectively connected to the inlet of the compressor; the first throttle is connected between the first outlet of the subcooler and the inlet of the compressor, the second throttle is connected between the outlet of the condenser and the first inlet of the gas-liquid separator, and the third throttle is connected between the outlet of the condenser and the second inlet of the evaporator.

[0005] Optionally, the outlet of the condenser is connected to the second inlet of the subcooler, and the second outlet of the subcooler is respectively connected to the first inlet of the gas-liquid separator and the second inlet of the evaporator; the second throttling device is connected between the second outlet of the subcooler and the first inlet of the gas-liquid separator, and the third throttling device is connected between the second outlet of the subcooler and the second inlet of the evaporator.

[0006] Optionally, the refrigeration system also includes a thermosiphon heat exchanger, which is tightly fitted with the condenser and the heat of the condenser can be transferred to the thermosiphon heat exchanger; the inlet of the thermosiphon heat exchanger is connected to the second outlet of the gas-liquid separator, and the outlet of the thermosiphon heat exchanger is connected to the first inlet of the subcooler.

[0007] Optionally, the refrigeration system further includes a fourth throttling member connected between the first outlet of the gas-liquid separator and the first inlet of the evaporator.

[0008] Optionally, the first throttling element is an expansion valve, a throttle valve or a capillary tube; and / or, the second throttling element is an expansion valve, a throttle valve or a capillary tube; and / or, the third throttling element is an expansion valve, a throttle valve or a capillary tube; and / or, the fourth throttling element is an expansion valve, a throttle valve or a capillary tube.

[0009] Optionally, the refrigeration system further includes a one-way valve connected between the outlet of the evaporator and the inlet of the compressor.

[0010] Optionally, the refrigeration system further includes a four-way valve, wherein port a, port b, port c and port d of the four-way valve are respectively connected to the outlet of the evaporator, the inlet of the compressor, the third outlet of the gas-liquid separator and the second inlet of the gas-liquid separator.

[0011] Optionally, the refrigeration system has an air-supplemented enthalpy-increasing refrigeration mode and a normal refrigeration mode; in the air-supplemented enthalpy-increasing refrigeration mode, the first throttling device and the second throttling device are both opened, the third throttling device is closed, the port a of the four-way valve is connected to the port b, and the port c of the four-way valve is connected to the port d; in the normal refrigeration mode, the first throttling device and the second throttling device are both closed, the third throttling device is opened, the port a of the four-way valve is connected to the port b, and the port c of the four-way valve is connected to the port d.

[0012] Optionally, the refrigeration system has an air-supplemented enthalpy-increasing refrigeration mode and a normal refrigeration mode; in the air-supplemented enthalpy-increasing refrigeration mode, the first throttling member and the second throttling member are both open, the third throttling member is closed, the port a of the four-way valve is connected to the port b, and the port c of the four-way valve is connected to the port d; in the normal refrigeration mode, the first throttling member and the second throttling member are both closed, and the third throttling member is opened; the normal refrigeration mode includes a first stage and a second stage, in the first stage, the port a of the four-way valve is connected to the port d, and the port b of the four-way valve is connected to the port c; in the second stage, the port a of the four-way valve is connected to the port b, and the port c of the four-way valve is connected to the port d.

[0013] In a second aspect, an embodiment of the present application further provides an air conditioner, which includes the above-mentioned refrigeration system.

[0014] The refrigeration system and air conditioner provided in the embodiments of the present application are achieved by connecting the outlet of the condenser to the first inlet of the gas-liquid separator and the second inlet of the evaporator respectively, the first outlet and the second outlet of the gas-liquid separator are connected to the first inlet of the evaporator and the first inlet of the subcooler respectively, the first outlet of the subcooler and the outlet of the evaporator are connected to the inlet of the compressor respectively, and a first throttling device is provided between the first outlet of the subcooler and the inlet of the compressor, a second throttling device is provided between the outlet of the condenser and the first inlet of the gas-liquid separator, and a third throttling device is provided between the outlet of the condenser and the second inlet of the evaporator. When the refrigeration system is in a severe working condition, the third throttling device can be closed and the first throttling device and the second throttling device are both opened to operate the air-injection and enthalpy-increasing refrigeration mode to improve the refrigeration effect; when the refrigeration system is in a moderate working condition, the third throttling device can be opened and the first throttling device and the second throttling device can be closed to turn off the air-injection and enthalpy-increasing function of the refrigeration system and switch to the normal refrigeration mode. In this way, while ensuring that the refrigeration demand is met, excessive energy consumption of the compressor can be avoided, which is beneficial to energy saving of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. In the following description, the same reference numerals represent the same parts.

[0016] Figure 1 A schematic diagram of the structure of the refrigeration system provided in an embodiment of the present application.

[0017] Figure 2 for Figure 1 The diagram shows the refrigerant flow direction when the refrigeration system operates in the air-supplementing enthalpy-increasing refrigeration mode.

[0018] Figure 3 for Figure 1 The diagram shown is one of the refrigerant flow diagrams when the refrigeration system operates in normal cooling mode.

[0019] Figure 4 for Figure 1 The second schematic diagram of the refrigerant flow direction when the refrigeration system is operating in normal cooling mode is shown.

[0020] Description of Figure Numbers:

[0021] 100, compressor; 200, condenser; 300, evaporator; 400, gas-liquid separator; 500, subcooler; 610, first throttling device; 620, second throttling device; 630, third throttling device; 640, fourth throttling device; 700, thermal siphon heat exchanger; 800, one-way valve; 900, four-way valve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The present application provides a refrigeration system. Figures 1 to 4As shown, the refrigeration system includes a compressor 100, a condenser 200, an evaporator 300, a gas-liquid separator 400, a subcooler 500, a first throttle 610, a second throttle 620, and a third throttle 630. The compressor 100 has an inlet and an outlet, the condenser 200 has an inlet and an outlet, the gas-liquid separator 400 has a first inlet, a second inlet, a first outlet, a second outlet, and a third outlet, the evaporator 300 has a first inlet, a second inlet, and an outlet, and the subcooler 500 has a first inlet, a second inlet, a first outlet, and a second outlet.

[0026] Specifically, the outlet of the compressor 100 is connected to the inlet of the condenser 200, the outlet of the condenser 200 is respectively connected to the first inlet of the gas-liquid separator 400 and the second inlet of the evaporator 300, the first outlet and the second outlet of the gas-liquid separator 400 are respectively connected to the first inlet of the evaporator 300 and the first inlet of the subcooler 500, the first outlet of the subcooler 500 and the outlet of the evaporator 300 are respectively connected to the inlet of the compressor 100; the first throttling device 610 is connected between the first outlet of the subcooler 500 and the inlet of the compressor 100, the second throttling device 620 is connected between the outlet of the condenser 200 and the first inlet of the gas-liquid separator 400, and the third throttling device 630 is connected between the outlet of the condenser 200 and the second inlet of the evaporator 300.

[0027] The refrigeration system provided by the embodiment of the present application is configured such that the outlet of the condenser 200 is connected to the first inlet of the gas-liquid separator 400 and the second inlet of the evaporator 300, the first outlet and the second outlet of the gas-liquid separator 400 are connected to the first inlet of the evaporator 300 and the first inlet of the subcooler 500, the first outlet of the subcooler 500 and the outlet of the evaporator 300 are connected to the inlet of the compressor 100, and a first throttling member 610 is provided between the first outlet of the subcooler 500 and the inlet of the compressor 100, a second throttling member 620 is provided between the outlet of the condenser 200 and the first inlet of the gas-liquid separator 400, and a second throttling member 620 is provided between the outlet of the condenser 200 and the second inlet of the evaporator 300. The third throttle member 630, when the refrigeration system is in a severe working condition (for example, the external ambient temperature is too high, the condenser 200 temperature is too high, the working current is too large, the exhaust temperature of the compressor 100 is too high, etc.), the third throttle member 630 can be closed and the first throttle member 610 and the second throttle member 620 are both opened to run the air-supply and reheat-increasing refrigeration mode to improve the refrigeration effect; when the refrigeration system is in a moderate working condition, the third throttle member 630 can be opened and the first throttle member 610 and the second throttle member 620 are both closed to turn off the air-supply and reheat-increasing function of the refrigeration system and switch to the normal refrigeration mode. In this way, while ensuring that the refrigeration needs are met, the compressor 100 can be prevented from consuming too much energy, which is beneficial to energy saving of air conditioners.

[0028] In some embodiments of the present application, the outlet of the condenser 200 is connected to the second inlet of the subcooler 500, and the second outlet of the subcooler 500 is respectively connected to the first inlet of the gas-liquid separator 400 and the second inlet of the evaporator 300; the second throttle member 620 is connected between the second outlet of the subcooler 500 and the first inlet of the gas-liquid separator 400, and the third throttle member 630 is connected between the second outlet of the subcooler 500 and the second inlet of the evaporator 300. By connecting the outlet of the condenser 200 with the second inlet of the subcooler 500, the subcooling degree of the liquid refrigerant discharged from the condenser 200 can be increased through the subcooler 500, thereby increasing the cooling capacity.

[0029] In some embodiments of the present application, the refrigeration system further includes a thermosyphon heat exchanger 700, which is tightly attached to the condenser 200 and can transfer heat from the condenser 200 to the thermosyphon heat exchanger 700. The thermosyphon heat exchanger 700 has an inlet and an outlet. The inlet of the thermosyphon heat exchanger 700 is connected to the second outlet of the gas-liquid separator 400, and the outlet of the thermosyphon heat exchanger 700 is connected to the first inlet of the subcooler 500. The thermosyphon heat exchanger 700 is used to sense the temperature of the condenser 200 and utilizes the thermal effect of the condenser 200 to promote the flow of refrigerant. When the temperature of the condenser 200 is too high, indicating a severe operating condition, the thermosyphon heat exchanger 700 enhances the heat exchange effect and increases the amount of siphoned refrigerant, thereby increasing the amount of air replenishment and protecting the compressor 100.

[0030] In some embodiments of the present application, the refrigeration system further includes a fourth throttle member 640, which is connected between the first outlet of the gas-liquid separator 400 and the first inlet of the evaporator 300. Since the evaporation temperature is determined by the evaporation pressure, a higher liquid pressure in the evaporator 300 due to the gravity of the liquid column in the gas-liquid separator 400 will cause a higher evaporation pressure. Therefore, the present application disposes the fourth throttle member 640 between the first outlet of the gas-liquid separator 400 and the first inlet of the evaporator 300. The fourth throttle member 640 can reduce the higher evaporation temperature caused by the gravity of the liquid refrigerant flowing out of the gas-liquid separator 400 on the evaporator 300.

[0031] Optionally, the first throttling element 610 is an expansion valve, a throttle valve, or a capillary tube. Optionally, the second throttle element 620 is an expansion valve (e.g., an electronic expansion valve or a thermal expansion valve), a throttle valve, or a capillary tube. Optionally, the third throttle element 630 is an expansion valve (e.g., an electronic expansion valve or a thermal expansion valve), a throttle valve, or a capillary tube. Optionally, the fourth throttle element 640 is an expansion valve (e.g., an electronic expansion valve or a thermal expansion valve), a throttle valve, or a capillary tube.

[0032] In some embodiments of the present application, the refrigeration system further includes a one-way valve 800, which is connected between the outlet of the evaporator 300 and the inlet of the compressor 100. Specifically, the one-way valve 800 is connected in a direction from the evaporator 300 to the compressor 100. The one-way valve 800 can reduce liquid backflow in the refrigerant flow path and improve the reliability of the refrigeration system.

[0033] In some embodiments of the present application, the refrigeration system further includes a four-way valve 900 having ports a, b, c, and d. Ports a, b, c, and d of the four-way valve 900 are connected to the outlet of the evaporator 300, the inlet of the compressor 100, the third outlet of the gas-liquid separator 400, and the second inlet of the gas-liquid separator 400, respectively. The present application achieves switching of the refrigerant flow path through a single four-way valve 900, thereby simplifying the overall structure of the refrigeration system. When the refrigeration system further includes a one-way valve 800, the one-way valve 800 is connected between the outlet of the evaporator 300 and port a of the four-way valve 900.

[0034] The refrigeration system provided in the embodiment of the present application has an air-supplementing and enthalpy-increasing refrigeration mode and a normal refrigeration mode. The refrigeration system can switch between the air-supplementing and enthalpy-increasing refrigeration mode and the normal refrigeration mode by controlling the opening and closing states of the first throttle member 610, the second throttle member 620 and the third throttle member 630. Specifically, the air-supplementing and enthalpy-increasing refrigeration mode can be operated under severe working conditions, and the normal refrigeration mode can be operated under moderate working conditions.

[0035] The following will Figure 1 As an example, the refrigeration system shown in the figure is combined with Figures 2 and 3 The following describes the air-supply enthalpy-increasing refrigeration mode and the normal refrigeration mode of the refrigeration system:

[0036] In the air-injection enthalpy-increasing refrigeration mode, the first throttle 610 and the second throttle 620 are both open, the third throttle 630 is closed, the port a of the four-way valve 900 is connected to the port b, and the port c of the four-way valve 900 is connected to the port d. Figure 2As shown, in the air-compensating enthalpy-increasing refrigeration mode, the refrigerant discharged from the outlet of the compressor 100 flows through the inlet of the condenser 200, the outlet of the condenser 200, the second inlet of the subcooler 500, the second outlet of the subcooler 500 and the first inlet of the gas-liquid separator 400 in sequence; a part of the refrigerant in the gas-liquid separator 400 flows out from the first outlet of the gas-liquid separator 400 and flows through the fourth throttling member 640, the first inlet of the evaporator 300, the outlet of the evaporator 300, the one-way valve 800, the four-way valve 900 in sequence. At the same time, under the heating effect of the condenser 200 on the thermosiphon heat exchanger 700, another part of the refrigerant in the gas-liquid separator 400 flows out from the second outlet of the gas-liquid separator 400 and flows through the inlet of the thermosiphon heat exchanger 700, the outlet of the thermosiphon heat exchanger 700, the first inlet of the subcooler 500, the first outlet of the subcooler 500 (the subcooler 500 subcools the refrigerant) and the inlet of the compressor 100, forming a cycle. It is understandable that under severe working conditions, the pressure of the condenser 200 is too high and the compression ratio of the compressor 100 is high. By adding air to increase enthalpy, the suction volume of the compressor 100 can be increased, the compression ratio can be reduced, and the gas compressed to the intermediate process can be cooled and then continued to be compressed and discharged to reduce the exhaust temperature.

[0037] In some embodiments of the present application, in normal cooling mode, the first throttle member 610 and the second throttle member 620 are both closed, the third throttle member 630 is open, the port a of the four-way valve 900 is connected to the port b, and the port c of the four-way valve 900 is connected to the port d. Figure 3 As shown, in the normal cooling mode, the refrigerant discharged from the outlet of the compressor 100 flows through the inlet of the condenser 200, the outlet of the condenser 200, the second inlet of the subcooler 500, the second outlet of the subcooler 500, the third throttling member 630, the second inlet of the evaporator 300, the outlet of the evaporator 300, the one-way valve 800, the port a of the four-way valve 900, the port b of the four-way valve 900 and the inlet of the compressor 100, and circulates in this way.

[0038] In other embodiments of the present application, in normal cooling mode, the first throttle member 610 and the second throttle member 620 are both closed, and the third throttle member 630 is open. The normal cooling mode includes a first stage and a second stage, which are performed in sequence. In the first stage, the port a of the four-way valve 900 is connected to the port d, and the port b of the four-way valve 900 is connected to the port c; in the second stage, the port a of the four-way valve 900 is connected to the port b, and the port c of the four-way valve 900 is connected to the port d. Specifically, Figure 4As shown, the refrigerant discharged from the outlet of the compressor 100 flows through the inlet of the condenser 200, the outlet of the condenser 200, the second inlet of the subcooler 500, the second outlet of the subcooler 500, the third throttling device 630, the second inlet of the evaporator 300, the outlet of the evaporator 300, the one-way valve 800, the port a of the four-way valve 900, the port d of the four-way valve 900, the second inlet of the gas-liquid separator 400, the first outlet of the gas-liquid separator 400, the fourth throttling device 640, the first inlet of the evaporator 300, the outlet of the evaporator 300, the one-way valve 800, the port a of the four-way valve 900, the port b of the four-way valve 900 and the inlet of the compressor 100, and circulates in this manner. It can be understood that since the refrigeration system has a large amount of refrigerant, the liquid circulation volume of the evaporator 300 is greater than the evaporation and gasification volume of the evaporator 300. Therefore, the normal refrigeration mode is set to include the first and second stages performed in sequence. Recirculation is achieved through the first stage to prevent liquid hammer in the compressor 100. At the same time, since the heat transfer coefficient of the liquid is several times that of the gas, the liquid contact area of ​​the evaporator 300 can be increased to improve the evaporation efficiency.

[0039] The present application also provides an air conditioner including a refrigeration system. The specific structure of the refrigeration system is as described in the above embodiments. Since the present air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be detailed here.

[0040] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0041] The above is a detailed introduction to the refrigeration system and air conditioner provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A refrigeration system, characterized in that: It comprises a compressor (100), a condenser (200), an evaporator (300), a gas-liquid separator (400), a subcooler (500), a first throttling element (610), a second throttling element (620) and a third throttling element (630); The outlet of the compressor (100) is communicated with the inlet of the condenser (200), the outlet of the condenser (200) is respectively communicated with the first inlet of the gas-liquid separator (400) and the second inlet of the evaporator (300), the first outlet and the second outlet of the gas-liquid separator (400) are respectively communicated with the first inlet of the evaporator (300) and the first inlet of the subcooler (500), and the outlet of the evaporator (300) and the first outlet of the subcooler (500) are respectively communicated with the inlet of the compressor (100); The first throttling device (610) is connected between the first outlet of the subcooler (500) and the inlet of the compressor (100), the second throttling device (620) is connected between the outlet of the condenser (200) and the first inlet of the gas-liquid separator (400), and the third throttling device (630) is connected between the outlet of the condenser (200) and the second inlet of the evaporator (300).

2. The refrigeration system according to claim 1, characterized in that: The outlet of the condenser (200) is in communication with the second inlet of the subcooler (500), and the second outlet of the subcooler (500) is in communication with the first inlet of the gas-liquid separator (400) and the second inlet of the evaporator (300), respectively; The second throttling device (620) is connected between the second outlet of the subcooler (500) and the first inlet of the gas-liquid separator (400), and the third throttling device (630) is connected between the second outlet of the subcooler (500) and the second inlet of the evaporator (300).

3. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises a thermosyphon heat exchanger (700), wherein the thermosyphon heat exchanger (700) is tightly fitted to the condenser (200) and the heat of the condenser (200) can be transferred to the thermosyphon heat exchanger (700); The inlet of the thermosyphon heat exchanger (700) is connected to the second outlet of the gas-liquid separator (400), and the outlet of the thermosyphon heat exchanger (700) is connected to the first inlet of the subcooler (500).

4. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises a fourth throttling member (640), wherein the fourth throttling member (640) is connected between the first outlet of the gas-liquid separator (400) and the first inlet of the evaporator (300).

5. The refrigeration system according to claim 4, characterized in that: The first throttling element (610) is an expansion valve, a throttling valve or a capillary tube; and / or, the second throttling element (620) is an expansion valve, a throttling valve or a capillary tube; And / or, the third throttling element (630) is an expansion valve, a throttling valve or a capillary tube; And / or, the fourth throttling element (640) is an expansion valve, a throttling valve or a capillary tube.

6. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises a one-way valve (800), wherein the one-way valve (800) is connected between the outlet of the evaporator (300) and the inlet of the compressor (100).

7. The refrigeration system according to any one of claims 1 to 6, characterized in that: The refrigeration system further comprises a four-way valve (900), wherein ports a, b, c and d of the four-way valve (900) are respectively connected to the outlet of the evaporator (300), the inlet of the compressor (100), the third outlet of the gas-liquid separator (400) and the second inlet of the gas-liquid separator (400).

8. The refrigeration system according to claim 7, characterized in that: The refrigeration system has an air-supplementing enthalpy-increasing refrigeration mode and a normal refrigeration mode; In the air-compensating enthalpy-increasing refrigeration mode, the first throttling element (610) and the second throttling element (620) are both opened, the third throttling element (630) is closed, the port a of the four-way valve (900) is connected to the port b, and the port c of the four-way valve (900) is connected to the port d; In the normal refrigeration mode, the first throttling element (610) and the second throttling element (620) are both closed, the third throttling element (630) is opened, the port a of the four-way valve (900) is connected to the port b, and the port c of the four-way valve (900) is connected to the port d.

9. The refrigeration system according to claim 7, characterized in that: The refrigeration system has an air-supplementing enthalpy-increasing refrigeration mode and a normal refrigeration mode; In the air-compensating enthalpy-increasing refrigeration mode, the first throttling element (610) and the second throttling element (620) are both opened, the third throttling element (630) is closed, the port a of the four-way valve (900) is connected to the port b, and the port c of the four-way valve (900) is connected to the port d; In the normal refrigeration mode, the first throttling member (610) and the second throttling member (620) are both closed, and the third throttling member (630) is opened; the normal refrigeration mode includes a first stage and a second stage, in which, in the first stage, the a port of the four-way valve (900) is connected to the d port, and the b port of the four-way valve (900) is connected to the c port; in the second stage, the a port of the four-way valve (900) is connected to the b port, and the c port of the four-way valve (900) is connected to the d port.

10. An air conditioner, characterized in that: The air conditioner comprises the refrigeration system according to any one of claims 1 to 9.

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