A kind of jet refrigeration system and refrigeration equipment

Abstract

The present invention discloses an ejection refrigeration system and a refrigeration device, wherein the ejection refrigeration system comprises a compressor, a condenser, an ejector, a first throttling device, a second throttling device, a first evaporator, a second evaporator, a gas-liquid separator and a circuit switching unit. The condenser is connected to the inlet of the ejector, the outlet of the ejector is connected to the inlet of the gas-liquid separator, and the gas phase outlet of the gas-liquid separator is connected to the inlet of the compressor; the liquid phase outlet of the gas-liquid separator is connected in series with the first throttling device, the first evaporator and the ejection inlet of the ejector to form a first ejection circuit; the liquid phase outlet is connected in series with the second throttling device, the second evaporator and the ejection inlet to form a second ejection circuit. The present invention can avoid the limitation on the size requirement of the ejector nozzle caused by the small flow rate entering the ejection inlet in the prior art, thereby conveniently realizing the processing of the nozzle and reducing the production and manufacturing cost of the ejector.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, in particular to a jet refrigeration system and refrigeration equipment. Background Art

[0002] As people's living standards improve, their demands for household refrigerators are getting higher and higher, including multi-temperature zones, fresh-keeping, rapid freezing, intelligent control, etc. However, the energy efficiency of refrigerators is still one of the most important indicators to consider. According to relevant statistics, the power consumption of small refrigeration equipment such as refrigerators accounts for 30%-40% of the total power consumption of residents, so it is of great significance to explore refrigerator energy-saving technology.

[0003] At present, most dual-temperature refrigerators on the market use a series-parallel vapor compression refrigeration cycle, and its energy loss mainly comes from the compressor, condenser and throttling device. On the one hand, the refrigeration evaporation pressure of the dual-temperature refrigerator is equal to the freezing evaporation pressure, so there is a large heat transfer temperature difference between the refrigeration evaporator and the freezing evaporator, and there is irreversible loss in the heat transfer process; on the other hand, the capillary tube is used as the main throttling element in the traditional vapor compression refrigeration cycle, which has a large throttling loss.

[0004] In refrigeration systems, ejectors are often used to recover the expansion work lost in the throttling process, reduce the compressor pressure ratio, and thus improve the energy efficiency of refrigerators. However, the typical ejector efficiency enhancement method currently uses the method of diverting from the outlet of the condenser. Part of the refrigerant diverted from the condenser directly enters the injection inlet of the ejector, and the other part passes through an evaporator and enters the ejector's injection inlet again. Diverting from the condenser outlet will cause the refrigerant flow rate entering the nozzle to become smaller, which requires the nozzle throat diameter to be smaller, which is not conducive to the processing of the nozzle; and the injection after the condenser diversion will reduce the ejector's injection capacity, thereby affecting the boost effect and causing the ejector efficiency to decrease. Summary of the invention

[0005] The object of the present invention is to provide an injection refrigeration system to solve the deficiencies in the prior art. It can avoid the limitation on the size requirement of the nozzle of the injector caused by the small flow rate entering the injection inlet in the prior art, thereby facilitating the processing of the nozzle and reducing the production cost of the injector.

[0006] The ejector refrigeration system provided by the present invention comprises a compressor, a condenser, an ejector, a first throttling device, a second throttling device, a first evaporator, a second evaporator, a gas-liquid separator and a circuit switching unit, wherein the ejector has an ejection inlet, an injection inlet and an ejection outlet; the gas-liquid separator has a separator inlet, a gas phase outlet and a liquid phase outlet;

[0007] The condenser is in communication with the injection inlet, the injection outlet is in communication with the separator inlet, and the gas phase outlet is in communication with the compressor inlet;

[0008] The liquid phase outlet is connected in series with the first throttling device, the first evaporator and the ejector inlet to form a first ejection circuit;

[0009] The liquid phase outlet is connected in series with the second throttling device, the second evaporator and the injection inlet to form a second injection circuit;

[0010] The circuit switching unit is used to control the on or off of the first injection circuit and the circuit switching unit is used to control the on or off of the second injection circuit.

[0011] Further, the circuit switching unit is a three-way solenoid valve having an inlet, a first outlet and a second outlet;

[0012] The liquid phase outlet is communicated with the inlet, the first outlet is communicated with the first throttling device, and the second outlet is communicated with the second throttling device.

[0013] Furthermore, an oil return pipeline is provided between the gas-liquid separator and the compressor.

[0014] Furthermore, the oil return pipeline is provided with an electric control valve body for controlling the conduction or closing of the oil return pipeline.

[0015] Furthermore, a dryer is provided between the condenser and the injection inlet.

[0016] Furthermore, the condenser is an air-cooled condenser, and a built-in condenser is provided between the dryer and the condenser.

[0017] Furthermore, the circuit switching unit also includes a first solenoid valve arranged on the first injection circuit and a second solenoid valve arranged on the second injection circuit.

[0018] Furthermore, the first solenoid valve is arranged between the liquid phase outlet and the first throttling device, and the second solenoid valve is arranged between the liquid phase outlet and the second throttling device.

[0019] A refrigeration device comprises the above-mentioned ejection refrigeration system, wherein the box has a first refrigeration compartment and a second refrigeration compartment, the first evaporator is arranged in the first refrigeration compartment, and the second evaporator is arranged in the second refrigeration compartment.

[0020] Furthermore, the refrigeration equipment is a refrigerator.

[0021] Compared with the prior art, the present invention directly connects the pipeline flowing out of the condenser to the injection inlet of the ejector. Since the refrigerant flowing out of the condenser is under high pressure, it is directly connected to the injection inlet without diversion, so that the refrigerant has a higher flow rate, and can still produce a strong injection effect when the nozzle is large. It ensures that the flow rate of the refrigerant entering the nozzle is large enough and the flow rate is high enough, which can avoid the limitation of the size requirement of the nozzle of the ejector caused by the small flow rate entering the injection inlet in the prior art, thereby facilitating the processing of the nozzle and reducing the production cost of the ejector. The ejector can obtain a higher boosting capacity, thereby reducing the pressure ratio and power consumption of the compressor. At the same time, a circuit switching unit is provided, and the refrigerant coming out of the outlet of the gas-liquid separator is controlled by the circuit switching unit to flow into the first injection circuit or the second injection circuit. Such a design can increase the gas pressure of the injection circuit, and it is more convenient to realize the injection of the refrigerant flowing out of the evaporator, so as to better achieve the mixing with the refrigerant flowing into the injection inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a refrigeration device disclosed in an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the flow of refrigerant in the first injection circuit in the refrigeration device disclosed in an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the flow of refrigerant in the second injection circuit in the refrigeration device disclosed in an embodiment of the present invention;

[0025] Explanation of the reference numerals: 1 - compressor, 2 - condenser, 3 - ejector, 31 - ejection inlet, 32 - ejection inlet, 33 - ejection outlet, 34 - mixing chamber, 35 - diffusion chamber, 36 - nozzle 4 - first throttling device, 5 - second throttling device, 6 - first evaporator, 7 - second evaporator, 8 - gas-liquid separator, 81 - separator inlet, 82 - gas phase outlet, 83 - liquid phase outlet, 9 - circuit switching unit, 91 - inlet, 92 - first outlet, 93 - second outlet, 10 - electric control valve body, 11 - dryer, 12 - built-in condenser. DETAILED DESCRIPTION

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0027] Embodiments of the present invention: Figure 1As shown, an ejector refrigeration system is disclosed, comprising a compressor 1, a condenser 2, an ejector 3, a first throttling device 4, a second throttling device 5, a first evaporator 6, a second evaporator 7, a gas-liquid separator 8 and a circuit switching unit 9, wherein the ejector 3 has an ejection inlet 31, an injection inlet 32 ​​and an ejection outlet 33; the gas-liquid separator 8 has a separator inlet 81, a gas phase outlet 82 and a liquid phase outlet 83;

[0028] The condenser 2 is in communication with the injection inlet 31 , the injection outlet 33 is in communication with the separator inlet 81 , and the gas phase outlet 82 is in communication with the inlet of the compressor 1 ;

[0029] The liquid phase outlet 83 is connected in series with the first throttling device 4, the first evaporator 6 and the injection inlet 32 ​​of the ejector 3 to form a first injection circuit; specifically, the outlet of the liquid phase outlet 83 is communicated with the inlet of the first throttling device 4, the outlet of the first throttling device 4 is communicated with the inlet of the first evaporator 6, and the outlet of the first evaporator 6 is communicated with the injection inlet 32. The gas-liquid two-phase refrigerant flowing out of the first evaporator 6 is pressurized by the ejector 3 and then ejected from the ejector outlet 33, and then enters the gas-liquid separator 8. The gas-phase refrigerant flowing out of the gas-phase outlet 82 of the gas-liquid separator 8 returns to the compressor for recirculation, while the liquid-phase refrigerant flowing out of the liquid phase outlet 83 of the gas-liquid separator 8 enters the first evaporator 6 after throttling and depressurization to absorb heat to cool the outside.

[0030] The liquid phase outlet 83 is connected in series with the second throttling device 5, the second evaporator 7 and the injection inlet 32 ​​to form a second injection circuit; specifically, the outlet of the liquid phase outlet 83 is connected to the inlet of the second throttling device 5, the outlet of the second throttling device 5 is connected to the inlet of the second evaporator 7, and the outlet of the second evaporator 7 is connected to the injection inlet 32. The gas-liquid two-phase refrigerant flowing out of the second evaporator 7 is pressurized by the ejector 3 and then ejected from the ejector outlet 33, and then enters the gas-liquid separator 8, the gas-phase refrigerant flowing out of the gas-phase outlet 82 of the gas-liquid separator 8 returns to the compressor for recirculation, and the liquid-phase refrigerant flowing out of the liquid phase outlet 83 of the gas-liquid separator 8 is throttled and depressurized and enters the second evaporator 7 to absorb heat to cool the outside. In this embodiment, the first throttling device 4 and the second throttling device 5 can be capillaries, the first evaporator 6 can be a refrigeration evaporator, and the second evaporator 7 can be a freezing evaporator.

[0031] The circuit switching unit 9 is used to control the on or off of the first injection circuit and the circuit switching unit 9 is used to control the on or off of the second injection circuit.

[0032] The working principle of the ejector 3 is that when the working fluid flows through the injection inlet 31, the static pressure energy or thermal energy of the airflow is converted into kinetic energy, and the working fluid forms a high-speed jet to cause a local vacuum, so that its pressure is lower than the pressure of the ejection fluid. Under the action of this pressure difference, the ejection fluid is ejected from the ejection inlet 32 ​​into the mixing chamber 34 of the ejector 3. Due to the turbulent diffusion effect of the jet boundary layer, the working fluid mixes with the surrounding entrained ejection fluid to exchange energy. After the ejection fluid enters the mixing chamber 34 of the ejector 3, it is accelerated under the action of the working steam, and the two steam fluids gradually form a single, uniform, and pressure-neutral mixed fluid in the mixing chamber 34. After the working fluid and the ejection fluid enter the mixing chamber 34, the speed is balanced, usually accompanied by a pressure increase. Subsequently, the steam fluid enters the diffusion chamber 35 of the ejector 3, the speed is continuously slowed down, the kinetic energy is continuously converted into static pressure energy, and the mixed fluid is decelerated and pressurized.

[0033] In this embodiment, the working fluid entering the ejector 3 is the high-temperature and high-pressure gas flowing out of the condenser 2. The high-temperature and high-pressure gas enters from the injection inlet 31, and then is ejected into the mixing chamber 34 through the nozzle 36, and is mixed with the injected injection fluid in the mixing chamber 34. The injection fluid is the low-pressure gas-phase refrigerant flowing out of the first evaporator 6 or the second evaporator 7, and is injected into the mixing chamber 34 through the injection inlet 32, and is mixed with the high-temperature and high-pressure working fluid in the mixing chamber 34 to form a mixed fluid. The formed mixed fluid is decelerated and pressurized by the diffusion chamber 35 to become a medium-pressure gas-liquid two-phase flow refrigerant, and then discharged from the injection outlet 33, and then enters the gas-liquid separator 8. The saturated gas refrigerant separated in the gas-liquid separator 8 flows out from the gas phase outlet 82 and is sucked into the inlet of the compressor 1, while the liquid refrigerant separated by the gas-liquid separator 8 flows out from the liquid phase outlet 83, passes through the throttling device, and is cooled and reduced in pressure, and finally enters the evaporator to absorb heat.

[0034] The introduction of the ejector 3 can actually increase the pressure of the low-pressure gas-phase refrigerant flowing out of the evaporator. During the pressure increase process, part of the expansion work of the throttling device after throttling can be recovered, which is beneficial to reduce the power consumption of the compressor and can effectively improve the performance of the compression refrigeration system. In the ejector 3 refrigeration system, the ejector 3 can assist in increasing the suction pressure of the compressor 1, thereby reducing the compression ratio of the compressor 1 and achieving the purpose of reducing power consumption.

[0035] The refrigerant flowing out of the throttling device forms a low-temperature and low-pressure gas-liquid two-phase after cooling and reducing the pressure, and then enters the evaporator to absorb heat and vaporize. If the heat is sufficient, the refrigerant can absorb heat in the evaporator to achieve complete vaporization, thereby forming a low-pressure gas-phase refrigerant. In this way, the gas-phase refrigerant coming out of the evaporator is sucked into the compressor for a new round of circulation. However, in the actual working process, the refrigerant coming out of the evaporator is generally in a state of gas-liquid coexistence. Because the heat absorption is not fully achieved in the evaporator, that is, the cooling capacity of part of the refrigerant coming out of the evaporator is not fully released, especially when the evaporator requires less cooling capacity, it is easy to cause the gas phase content of the refrigerant flowing out of the evaporator to be low, which further reduces the pressure of the gas-phase refrigerant, which will increase the difficulty of compressor suction and thus affect the efficiency of the compressor.

[0036] In order to assist in increasing the suction pressure of the compressor 1 and thereby reduce the compression ratio of the compressor 1, the present embodiment creatively draws the refrigerant from the evaporator into the ejector 3 by means of an injection and mixes it with the working fluid flowing in from the injection inlet 31 of the ejector 3. The working fluid entering from the injection inlet 31 is the low-temperature and high-pressure refrigerant flowing out of the condenser. The working fluid will be throttled and depressurized when passing through the nozzle 36 of the ejector 3 and entering the mixing chamber 34. The throttled and depressurized working fluid will be mixed with the refrigerant entering the mixing chamber 34 from the injection inlet 32. The mixed refrigerant will be decelerated and pressurized after passing through the diffusion chamber 35, and finally flow out from the injection outlet 33. In this process, the mixed refrigerant will actually be pressurized. In the process of pressurization, part of the refrigerant flowing out of the evaporator can be gasified again to increase the gas pressure of the gas-phase refrigerant, thereby assisting in increasing the suction pressure of the compressor 1 and thereby reducing the compression ratio of the compressor 1.

[0037] Using an ejector to increase the suction efficiency of the compressor 1 can effectively recover the expansion work lost in the throttling process. However, the typical ejector efficiency enhancement method currently uses a diversion method from the outlet of the condenser. Part of the refrigerant diverted from the condenser directly enters the injection inlet of the ejector, and the other part passes through an evaporator and enters the ejection inlet of the ejector again. Diversion from the condenser outlet will cause the refrigerant flow entering the nozzle to become smaller, which requires a smaller throat diameter of the nozzle, which is not conducive to the processing of the nozzle; and the ejection after the condenser diversion will reduce the ejection capacity of the ejector, thereby affecting the boosting effect and causing the ejector efficiency to decrease.

[0038] In the present application, the pipeline flowing out of the condenser 2 is directly connected to the injection inlet 31 of the ejector 3. Since the refrigerant flowing out of the condenser 2 is in a high pressure state, it is directly connected to the injection inlet 31 without diversion, so that the refrigerant has a higher flow rate, and can still produce a strong injection effect when the nozzle 36 is large. It is ensured that the flow rate of the refrigerant entering the nozzle 36 is large enough and the flow rate is high enough, which can avoid the limitation of the size requirement of the nozzle 36 of the ejector 3 caused by the small flow rate entering the injection inlet 31 in the prior art, thereby facilitating the processing of the nozzle 36 and reducing the production cost of the ejector 3. The ejector 3 can obtain a higher boosting capacity, thereby reducing the pressure ratio and power consumption of the compressor. At the same time, a circuit switching unit 9 is provided, and the circuit switching unit 9 controls the refrigerant coming out of the outlet of the gas-liquid separator 8 to flow into the first injection circuit or the second injection circuit. Such a design can increase the gas pressure of the injection circuit, and it is more convenient to realize the injection of the refrigerant flowing out of the evaporator, so as to better achieve the mixing with the refrigerant flowing into the injection inlet 31.

[0039] Specifically, in this embodiment, the circuit switching unit 9 can be a three-way solenoid valve arranged after the liquid phase outlet 83 of the gas-liquid separator 8 and has an inlet 91, a first outlet 92 and a second outlet 93 connected to the liquid phase outlet 83. The first outlet 92 is connected to the first throttling device 4, and the second outlet 93 is connected to the second throttling device 5. A valve body is also arranged in the three-way valve, and the valve body is used to control the inlet 91 to be connected to the first outlet 92 or to be connected to the second outlet 93. Of course, the valve body can also control the inlet 91 to be connected to the first outlet 92 and the second outlet 93 at the same time.

[0040] After the inlet 91 is connected with the first outlet 92, the refrigerant flowing out of the liquid phase outlet 83 of the gas-liquid separator 8 enters the first throttling device 4 and then enters the first evaporator 6 for cooling. After the inlet 91 is connected with the second outlet 93, the refrigerant flowing out of the liquid phase outlet 83 of the gas-liquid separator 8 enters the second throttling device 5 and then enters the second evaporator 7 for cooling.

[0041] In another embodiment, the gas circuit switching unit 9 includes a first solenoid valve disposed on the first injection circuit and a second solenoid valve disposed on the second injection circuit. Preferably, the first solenoid valve is disposed between the liquid phase outlet 83 and the first throttling device 4, and the second solenoid valve is disposed between the liquid phase outlet 83 and the second throttling device 5. The gas circuit switching unit 9 controls the first injection circuit and the second injection circuit respectively through two solenoid valves.

[0042] The cycle process of the above-mentioned injection refrigeration system is as follows: after the refrigerant enters the compressor 1, it is compressed and then pressurized and heated to become a high-temperature and high-pressure gaseous refrigerant (01 point). After coming out of the compressor 1, the high-temperature and high-pressure gaseous refrigerant releases heat and condenses in the condenser 2 to become a high-pressure subcooled liquid refrigerant (02 point). The high-pressure subcooled refrigerant (02 point) enters the injection inlet 31 of the ejector 3 as a working fluid, and after expansion and acceleration, it becomes a low-pressure and high-speed gas-liquid two-phase refrigerant, forming a low-pressure area in the mixing chamber 34 of the ejector 3. At the same time, the working fluid The low-pressure gaseous refrigerant at the outlet of the first evaporator 6 (point 03) or the low-pressure gaseous refrigerant at the outlet of the second evaporator 7 (point 04) is further injected from the injection inlet 32 ​​into the mixing chamber 34 and mixed with the working fluid in the mixing chamber 34 of the ejector 3, and finally passes through the diffusion chamber 35 to be decelerated and pressurized to become a medium-pressure gas-liquid two-phase refrigerant (point 05) and then discharged from the ejector 3, and then enters the gas-liquid separator 8. The saturated gaseous refrigerant (point 06) separated in the gas-liquid separator 8 enters the inlet of the compressor 100, completing a cycle.

[0043] The medium-pressure liquid-phase refrigerant separated in the gas-liquid separator 8 enters the first injection circuit or the second injection circuit in the circuit switching unit.

[0044] like Figure 2 As shown, when entering the first injection circuit, the medium-pressure liquid refrigerant (07 point) separated from the gas-liquid separator 8 enters the first throttling device 4, and the refrigerant (08 point) after pressure reduction and temperature reduction by throttling and heat recovery enters the first evaporator 6 in a gas-liquid two-phase state, and absorbs heat and evaporates at a higher evaporation temperature in the first evaporator 6 to achieve the purpose of refrigeration of the cold storage room. The low-pressure gas refrigerant (03 point) at the outlet of the first evaporator 6 enters the ejector 3 from the injection inlet 32, is decelerated and pressurized by the diffusion chamber 35 to become a medium-pressure gas-liquid two-phase flow refrigerant (05 point), and then is discharged from the ejector 3, and then enters the gas-liquid separator 8. The medium-pressure liquid refrigerant separated in the gas-liquid separator 8 enters the first injection circuit in the circuit switching unit, completing a cycle.

[0045] Similarly, if Figure 3 As shown, when entering the second injection circuit, the medium-pressure liquid refrigerant (09 point) separated from the gas-liquid separator 8 enters the second throttling device 5, and the refrigerant (010 point) after pressure reduction and temperature reduction by throttling and heat recovery enters the second evaporator 7 in a gas-liquid two-phase state, and absorbs heat and evaporates at a higher evaporation temperature in the second evaporator 7 to achieve the purpose of refrigeration of the cold storage room. The low-pressure gas refrigerant (04 point) at the outlet of the second evaporator 7 enters the ejector 3 from the injection inlet 32, is decelerated and pressurized by the diffusion chamber 35 to become a medium-pressure gas-liquid two-phase flow refrigerant (05 point), and then is discharged from the ejector 3, and then enters the gas-liquid separator 8. The medium-pressure liquid refrigerant separated in the gas-liquid separator 8 enters the second injection circuit in the circuit switching unit, completing the circulation of another circuit.

[0046] During the operation of the refrigeration system, the compressor 1 inevitably experiences oil injection, that is, a small amount of refrigeration oil will enter the pipeline of the refrigeration system along with the exhaust gas of the compressor 1, that is, the refrigeration oil will flow in the refrigeration system along with the circulation of the refrigerant. In the refrigeration system disclosed in the present embodiment, the oil enters the ejector 3 along with the refrigerant, and then the refrigerant enters the gas-liquid separator 8 in a two-phase state, and the separation of the gas phase and the liquid phase of the refrigerant is achieved through the action of impact and gravity. Due to the large volume of the gas-liquid separator 8, the two-phase refrigerant will accumulate at the bottom of the gas-liquid separator 8 under the action of impact and gravity when entering the gas-liquid separator 8, and the ejector 3 causes a low pressure to be formed at the bottom of the gas-liquid separator 8 and performs a suction effect on the liquid refrigerant at the bottom; at this time, a small part of the oil dissolved in the refrigerant will be drawn away by the compressor 1, but most of it will enter the first The first evaporator 6 or the second evaporator 7 is then sucked by the injection inlet 32 ​​of the ejector 3, and then enters the gas-liquid separator 8 again; therefore, most of the engine oil will be externally circulated between the ejector 3-gas-liquid separator 8-first evaporator 6 or the second evaporator 7-ejector 3 and cannot return to the compressor 1; and since the first evaporator 6 or the second evaporator 7 is basically located at the lowest point of the refrigeration system, the engine oil is easy to accumulate at the bottom of the first evaporator 6 or the second evaporator 7, which will cause the effective heat exchange area of ​​the first evaporator 6 or the second evaporator 7 to decrease over time, and the compressor 1 will be shut down or even damaged due to overheating due to lack of lubrication.

[0047] In order to avoid the above problems, in this embodiment, an oil return pipeline is also provided between the gas-liquid separator 8 and the compressor 1. The oil return pipeline is provided with an electric control valve body 10 for controlling the conduction or closing of the oil return pipeline. The oil return pipeline is connected to the position of the liquid phase outlet 83 of the gas-liquid separator 8, and is connected to the inlet of the compressor 1, and is used to return the oil in the gas-liquid separator 8 to the compressor 1. When refrigeration is not required, the jet refrigeration system enters the oil return mode after shutdown. At this time, the electric control valve body 10 is opened to connect the liquid phase outlet of the gas-liquid separator 8 to the air intake port of the compressor 1, and the refrigeration oil accumulated at the bottom of the gas-liquid separator 8 is returned to the compressor 1 by gravity.

[0048] Furthermore, a dryer 11 is provided between the condenser 2 and the injection inlet 31. In order to achieve a better condensation effect, the condenser 2 is an air-cooled condenser, and a built-in condenser 12 is provided between the dryer 11 and the condenser 2.

[0049] Another embodiment of the present invention further discloses a refrigeration device, including a box and the injection refrigeration system, wherein the box has a first refrigeration compartment and a second refrigeration compartment, the first evaporator is arranged in the first refrigeration compartment, and the second evaporator is arranged in the second refrigeration compartment.

[0050] Specifically, the refrigeration device is a refrigerator, the first refrigeration compartment is a cold storage compartment, the first evaporator is a cold storage evaporator, the second refrigeration compartment is a freezer compartment, and the second evaporator is a freezer evaporator.

[0051] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. An ejection refrigeration system, characterized in that: It includes a compressor, a condenser, an ejector, a first throttling device, a second throttling device, a first evaporator, a second evaporator, a gas-liquid separator and a circuit switching unit, wherein the ejector has an ejection inlet, an injection inlet and an ejection outlet; the gas-liquid separator has a separator inlet, a gas phase outlet and a liquid phase outlet; The condenser is in communication with the injection inlet, the injection outlet is in communication with the separator inlet, and the gas phase outlet is in communication with the compressor inlet; The liquid phase outlet is connected in series with the first throttling device, the first evaporator and the ejector inlet to form a first ejection circuit; The liquid phase outlet is connected in series with the second throttling device, the second evaporator and the injection inlet to form a second injection circuit; The circuit switching unit is used to control the on or off of the first injection circuit and the circuit switching unit is used to control the on or off of the second injection circuit.

2. The ejection refrigeration system according to claim 1, characterized in that: The circuit switching unit is a three-way solenoid valve having an inlet, a first outlet and a second outlet; The liquid phase outlet is communicated with the inlet, the first outlet is communicated with the first throttling device, and the second outlet is communicated with the second throttling device.

3. The ejection refrigeration system according to claim 1, characterized in that: An oil return pipeline is also provided between the gas-liquid separator and the compressor.

4. The ejection refrigeration system according to claim 3, characterized in that: The oil return pipeline is provided with an electric control valve body for controlling the opening or closing of the oil return pipeline.

5. The ejection refrigeration system according to claim 1, characterized in that: A dryer is also provided between the condenser and the injection inlet.

6. The ejection refrigeration system according to claim 5, characterized in that: The condenser is an air-cooled condenser, and a built-in condenser is also arranged between the dryer and the condenser.

7. The ejection refrigeration system according to claim 1, characterized in that: The circuit switching unit further includes a first solenoid valve arranged on the first injection circuit and a second solenoid valve arranged on the second injection circuit.

8. The ejection refrigeration system according to claim 7, characterized in that: The first solenoid valve is arranged between the liquid phase outlet and the first throttling device, and the second solenoid valve is arranged between the liquid phase outlet and the second throttling device.

9. A refrigeration device, characterized in that: The invention comprises a box body and the ejection refrigeration system according to any one of claims 1 to 8, wherein the box body has a first refrigeration compartment and a second refrigeration compartment, the first evaporator is arranged in the first refrigeration compartment, and the second evaporator is arranged in the second refrigeration compartment.

10. The refrigeration device according to claim 9, characterized in that: The refrigeration equipment is a refrigerator.

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