阅读说明：本技术 制冷设备 (Refrigeration device ) 是由 汤奇雄 赵家强 于 2019-10-31 设计创作，主要内容包括：本发明提供了一种制冷设备,包括压缩机、第一喷射器、第一冷凝器、第二冷凝器、第一蒸发器、第二蒸发器和第二喷射器；压缩机设有吸气口和排气口；第一喷射器的高压入口端与排气口连接；第一冷凝器的入口端与第一喷射器的出口端连接；第二冷凝器的入口端与排气口连接；第一蒸发器的出口端和第二蒸发器的出口端中一个与吸气口连接,另一个与第一喷射器的低压入口端连接；第二喷射器的高压入口端与第二冷凝器的出口端连接,第二喷射器的低压入口端与第一冷凝器的出口端连接,第二喷射器的出口端与第二蒸发器的入口端连接,第一冷凝器的出口端与第一蒸发器的入口端连接。可通过喷射器的引射作用实现大温跨时的梯级加热、冷却,提高能效。(The invention provides refrigeration equipment, which comprises a compressor, a first ejector, a first condenser, a second condenser, a first evaporator, a second evaporator and a second ejector, wherein the first ejector is connected with the first condenser; the compressor is provided with an air suction port and an air exhaust port; the high-pressure inlet end of the first ejector is connected with the exhaust port; the inlet end of the first condenser is connected with the outlet end of the first ejector; the inlet end of the second condenser is connected with the exhaust port; one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the air suction port, and the other one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the low-pressure inlet end of the first ejector; the high-pressure inlet end of the second ejector is connected with the outlet end of the second condenser, the low-pressure inlet end of the second ejector is connected with the outlet end of the first condenser, the outlet end of the second ejector is connected with the inlet end of the second evaporator, and the outlet end of the first condenser is connected with the inlet end of the first evaporator. The injection effect of the ejector can realize step heating and cooling in a large temperature span, and the energy efficiency is improved.)

1. A refrigeration apparatus, comprising:

the compressor is provided with an air suction port and an air exhaust port;

a first ejector having a high pressure inlet end connected to the exhaust port;

the inlet end of the first condenser is connected with the outlet end of the first ejector;

the inlet end of the second condenser is connected with the exhaust port;

one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the air suction port, and the other one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the low-pressure inlet end of the first ejector;

and the high-pressure inlet end of the second ejector is connected with the outlet end of the second condenser, the low-pressure inlet end of the second ejector is connected with the outlet end of the first condenser, the outlet end of the second ejector is connected with the inlet end of the second evaporator, and the outlet end of the first condenser is connected with the inlet end of the first evaporator.

2. The refrigeration appliance according to claim 1, further comprising:

and the inlet end of the first throttling part is connected with the outlet end of the first condenser, and the outlet end of the first throttling part is connected with the inlet end of the first evaporator.

3. The refrigeration appliance according to claim 2, further comprising:

the inlet end of the first gas-liquid separator is connected with the outlet end of the first condenser, the gas outlet end of the first gas-liquid separator is connected with the low-pressure inlet end of the second ejector, and the liquid outlet end of the first gas-liquid separator is connected with the inlet end of the first throttling component.

4. A refrigeration device as recited in any one of claims 1 to 3 further comprising:

and the inlet end of the second throttling part is connected with the outlet end of the second ejector, and the outlet end of the second throttling part is connected with the inlet end of the second evaporator.

5. The refrigeration appliance according to claim 4, further comprising:

the first inlet end of the regenerator is connected with the outlet end of the second ejector, and the first outlet end of the regenerator is connected with the inlet end of the second throttling component;

the second inlet end of the heat regenerator is connected with the outlet end of the first evaporator;

and the outlet end of the first evaporator is connected with the suction port or the low-pressure inlet end of the first ejector through the second outlet end of the heat regenerator.

6. The refrigeration appliance according to claim 4, further comprising:

and the inlet end of the second gas-liquid separator is connected with the outlet end of the second ejector, and the liquid outlet end of the second gas-liquid separator is connected with the inlet end of the second throttling component.

7. The refrigeration appliance according to claim 6, further comprising:

and the high-pressure inlet end of the third ejector is connected with the outlet end of the second ejector, the outlet end of the third ejector is connected with the inlet end of the second gas-liquid separator, and the low-pressure inlet end of the third ejector is connected with the outlet end of the second evaporator.

8. The refrigeration appliance according to any one of claims 1 to 3,

the number of the exhaust ports is one; or

The quantity of gas vent is two, is first gas vent and second gas vent respectively, first gas vent with the second gas vent communicates each other, the high pressure entry end of first sprayer with first gas vent is connected, the entry end of second condenser with the second gas vent is connected.

9. The refrigeration appliance according to any one of claims 1 to 3,

the number of the exhaust ports is two, the exhaust ports are respectively a third exhaust port and a fourth exhaust port, and the third exhaust port and the fourth exhaust port are used for exhausting gas with different pressures;

the high-pressure inlet end of the first ejector is connected with the third exhaust port, and the inlet end of the second condenser is connected with the fourth exhaust port.

10. A cold appliance according to claim 2 or 3,

the first throttling part is a capillary tube or an expansion valve.

Technical Field

The invention belongs to the technical field of refrigerating devices, and particularly relates to refrigerating equipment.

Background

In the field of refrigeration/heat pump heating, in some cases, due to the large temperature span of being refrigerated or heated, for example, in a direct-heating heat pump water heater, water needs to be heated from 15 ℃ to 50 ℃, and a single condenser has only one condensing pressure, which means that the condensing temperature of the whole system is high, resulting in low energy efficiency of the system. Or in the freezing system of the extremely hot area, the outdoor environment temperature is very high, the temperature required by freezing reaches-30 ℃ to-60 ℃, and the single-exhaust refrigeration system has lower efficiency. And the cascade utilization of energy is realized by arranging double evaporation or double condensers, so that the efficiency of the product can be effectively improved. However, at present, such dual temperature systems usually employ a cascade cycle, two-stage compression, etc., which mainly use different boiling points of different substances in a mixed refrigerant or different discharge pressures of multiple compressions, and have a complicated structure.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the invention proposes a refrigeration device.

In view of this, according to a first aspect of the present invention, there is provided a refrigeration apparatus including a compressor, a first ejector, a first condenser, a second condenser, a first evaporator, a second evaporator, and a second ejector; the compressor is provided with an air suction port and an air exhaust port; the high-pressure inlet end of the first ejector is connected with the exhaust port; the inlet end of the first condenser is connected with the outlet end of the first ejector; the inlet end of the second condenser is connected with the exhaust port; one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the air suction port, and the other one of the outlet end of the first evaporator and the outlet end of the second evaporator is connected with the low-pressure inlet end of the first ejector; the high-pressure inlet end of the second ejector is connected with the outlet end of the second condenser, the low-pressure inlet end of the second ejector is connected with the outlet end of the first condenser, the outlet end of the second ejector is connected with the inlet end of the second evaporator, and the outlet end of the first condenser is connected with the inlet end of the first evaporator.

The refrigeration equipment provided by the invention is characterized in that two condensers are arranged for a compressor, two branches are separated from an exhaust port of the compressor, the first branch is connected with a first condenser, the second branch is connected with a second condenser, a first ejector is arranged between the exhaust port and an inlet end of the first condenser on the first branch, a high-pressure inlet end of the first ejector is specifically connected with the exhaust port, a low-pressure inlet end of the first ejector is connected with an outlet end of a first evaporator or an outlet end of a second evaporator, and high-pressure refrigerant discharged from the exhaust port and low-pressure refrigerant entering from a low-pressure inlet can be converged and then flow through the first condenser, so that the refrigerants can realize different condensing temperatures in the first condenser and the second condenser, and step heating during large-temperature span heating is realized. In addition, after the refrigerants with different pressures pass through the first condenser and the second condenser for condensation, the refrigerants with different pressures are still likely to be formed, so that different evaporation temperatures of the refrigerants in the first evaporator and the second evaporator are facilitated, and the step cooling during the large-temperature span cooling is realized. The injection effect of the first ejector of accessible realizes the confluence of different pressure refrigerants to even if the quantity of compressor is one, also can realize the cascade utilization of energy, realize two condensing temperature, two evaporating temperature even, the lift system efficiency need not to set up two compressors, also need not to make the compressor be the compressor that can discharge the structure complicacy of the refrigerant of different pressures, simple structure practices thrift the cost.

In addition, the outlet end of the second condenser is connected with the second ejector, the outlet end of the specific second condenser is connected with the high-pressure inlet end of the second ejector, and the outlet end of the first condenser is connected with the low-pressure inlet end of the second ejector.

In addition, according to the refrigeration equipment in the above technical solution provided by the present invention, the refrigeration equipment may further have the following additional technical features:

in one possible design, the refrigeration appliance further comprises: and the inlet end of the first throttling component is connected with the outlet end of the first condenser, and the outlet end of the first throttling component is connected with the inlet end of the first evaporator. The throttling decompression can be carried out on the refrigerant, and the saturation temperature of the refrigerant is reduced, so that the evaporation effect of the refrigerant in the first evaporator is ensured.

In one possible design, the refrigeration appliance further comprises: and the inlet end of the first gas-liquid separator is connected with the outlet end of the first condenser, the gas outlet end of the first gas-liquid separator is connected with the low-pressure inlet end of the second ejector, and the liquid outlet end of the first gas-liquid separator is connected with the inlet end of the first throttling component.

In this configuration, by providing the first gas-liquid separator, the refrigerant discharged from the first condenser can be separated when the refrigerant is a gas-liquid two-phase refrigerant. The gas outlet end of the first gas-liquid separator is connected with the low-pressure inlet end of the second ejector, so that on one hand, gas-liquid two-phase refrigerant is prevented from entering the second ejector, the capacity required by the second ejector is reduced, the volume of the second ejector is reduced, on the other hand, the design difficulty of the second ejector is increased when the gas-liquid two-phase refrigerant is discharged from the first condenser, and the structure of the second ejector is facilitated to be simplified. And the liquid outlet end of the first gas-liquid separator is connected with the first evaporator through the first throttling component, so that the refrigerant entering the first throttling component can be ensured to be liquid-phase refrigerant, and the throttling effect is improved.

In one possible design, the refrigeration appliance further comprises: and the inlet end of the second throttling part is connected with the outlet end of the second ejector, and the outlet end of the second throttling part is connected with the inlet end of the second evaporator.

In this configuration, the second ejector is connected to the second evaporator via the second throttle member, whereby the refrigerant discharged from the second ejector is further reduced in pressure, the saturation temperature of the refrigerant is lowered, and the cooling effect by the evaporation of the refrigerant in the second evaporator is improved.

In one possible design, the refrigeration appliance further comprises: the first inlet end of the heat regenerator is connected with the outlet end of the second ejector, and the first outlet end of the heat regenerator is connected with the inlet end of the second throttling component; the second inlet end of the heat regenerator is connected with the outlet end of the first evaporator; the outlet end of the first evaporator is connected with the suction port or the low-pressure inlet end of the first ejector through the second outlet end of the heat regenerator.

In this design, the second ejector is connected to the second throttle member via the regenerator, so that the refrigerant can be cooled before throttling, the refrigerant entering the second throttle member is ensured to be a liquid refrigerant, and the throttling effect of the second throttle member is improved as compared with the case where the refrigerant entering the second throttle member is a gas-liquid two-phase refrigerant. Under the condition that the first evaporator is connected with the low-pressure inlet end of the first ejector, the first evaporator is connected with the low-pressure inlet end of the first ejector through the heat regenerator, the temperature of the refrigerant which is about to enter the low-pressure inlet end can be increased through the heat regenerator, the refrigerant can enter the first condenser after being discharged through the first ejector, a large amount of heat is condensed and discharged in the first condenser, and the heating effect is improved. Under the condition that the first evaporator is connected with the air suction port of the compressor, the first evaporator is connected with the compressor through the heat regenerator, so that the refrigerant to be fed into the compressor can be heated, the refrigerant fed into the compressor is ensured to be a gas-phase refrigerant, and the compressor is prevented from being damaged.

In one possible design, the refrigeration appliance further comprises: and the inlet end of the second gas-liquid separator is connected with the outlet end of the second ejector, and the liquid outlet end of the second gas-liquid separator is connected with the inlet end of the second throttling component.

In this configuration, the second ejector is connected to the second throttle member via the second gas-liquid separator, whereby the refrigerant entering the second throttle member can be ensured to be a liquid refrigerant, and the throttling effect of the second throttle member can be improved as compared with the case where the refrigerant entering the second throttle member is a gas-liquid two-phase refrigerant.

In one possible design, the refrigeration appliance further comprises: and the high-pressure inlet end of the third ejector is connected with the outlet end of the second ejector, the low-pressure inlet end of the third ejector is connected with the second evaporator, and the outlet end of the third ejector is connected with the inlet end of the second gas-liquid separator.

In the design, the third ejector is arranged between the second ejector and the second gas-liquid separator, so that on one hand, the pressure of the refrigerant can be further reduced, the refrigerant is favorably evaporated and absorbs heat in the second evaporator, and on the other hand, the outlet end of the second evaporator is connected with the low-pressure inlet end of the third ejector, namely, the second evaporator enters the low-pressure inlet of the first ejector or enters the suction port of the compressor after passing through the third ejector and the gas outlet end of the second gas-liquid separator, so that the entering refrigerant can be ensured to be a gas-phase refrigerant.

In one possible design, the number of exhaust ports is one.

In the design, the number of the exhaust ports of the compressor is set to be one, namely the compressor has one exhaust pressure, so that the structure of the compressor is simplified, and the cost is saved. Specifically, the high-pressure inlet end of the first ejector may be connected to a pipe connecting the exhaust port and the second condenser through a pipe, or the inlet end of the second condenser may be connected to a pipe connecting the exhaust port and the high-pressure inlet end of the first ejector through a pipe.

In a possible design, the number of the exhaust ports is two, namely a first exhaust port and a second exhaust port, the first exhaust port and the second exhaust port are communicated with each other, the high-pressure inlet end of the first ejector is connected with the first exhaust port, and the inlet end of the second condenser is connected with the second exhaust port.

In this design, the number of the exhaust ports may be two and communicated with each other, so that the compressor has only one exhaust pressure, the structure is simple, and the connection of the first ejector and the second condenser is convenient.

In one possible design, the number of the exhaust ports is two, namely a third exhaust port and a fourth exhaust port, and the third exhaust port and the fourth exhaust port are used for exhausting gas with different pressures; the high-pressure inlet end of the first ejector is connected with the third exhaust port, and the inlet end of the second condenser is connected with the fourth exhaust port.

In the design, the number of the exhaust ports is two, and the two exhaust ports respectively exhaust gases with different pressures, so that the double condensation temperatures and the double evaporation temperatures of the refrigeration equipment are more favorably realized. The type of compressor can be selected as desired to select two discharge ports of appropriate discharge pressure to regulate the evaporating and condensing temperatures of the refrigeration apparatus.

In one possible design, the first throttling element is a capillary tube or an expansion valve.

In the design, the first throttling part is specifically limited to be a throttling device such as a capillary tube or an expansion valve, so that a reliable throttling and pressure reducing effect is realized. The expansion valve can be an electronic expansion valve or a thermal expansion valve. Of course, the second throttling component may be a throttling device such as a capillary tube or an expansion valve.

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

Drawings

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

fig. 1 shows a schematic structural diagram of a refrigeration device according to a first embodiment of the invention;

fig. 2 shows a schematic configuration diagram of a refrigeration apparatus according to a second embodiment of the present invention;

fig. 3 shows a schematic configuration diagram of a refrigeration apparatus according to a third embodiment of the present invention;

fig. 4 shows a schematic configuration diagram of a refrigeration apparatus according to a fifth embodiment of the present invention;

fig. 5 shows a schematic configuration diagram of a refrigeration apparatus according to a seventh embodiment of the present invention;

fig. 6 shows a schematic configuration diagram of a refrigeration apparatus according to an eighth embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a refrigeration apparatus according to a ninth embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

102 compressor, 104 first condenser, 106 second condenser, 108 first evaporator, 110 second evaporator, 112 first ejector, 114 second ejector, 116 first gas-liquid separator, 118 first throttling element, 120 second throttling element, 122 regenerator, 124 second gas-liquid separator, 126 third ejector.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A refrigeration device according to some embodiments of the present invention is described below with reference to fig. 1 to 7.

The first embodiment is as follows:

as shown in fig. 1, a refrigerating apparatus includes a compressor 102, a first condenser 104, a second condenser 106, a first evaporator 108, a second evaporator 110, a first ejector 112, a second ejector 114, a first throttling part 118, and a first gas-liquid separator 116. The first throttling member 118 may be a throttling device such as a capillary tube or an expansion valve. The connection mode of the system is as follows: the refrigerant is discharged from the exhaust port of the compressor 102 and then divided into two paths, the first path enters the inlet end of the second condenser 106, the outlet end of the second condenser 106 is connected with the high-pressure inlet end of the second ejector 114, the outlet end of the second ejector 114 is connected with the inlet end of the second evaporator 110, and the outlet end of the second evaporator 110 is connected with the suction port of the compressor 102; the second path enters a high-pressure inlet end of a first ejector 112, an outlet end of the first ejector 112 is connected with an inlet end of a first condenser 104, an outlet end of the first condenser 104 is connected with an inlet end of a first gas-liquid separator 116, a liquid outlet end of the first gas-liquid separator 116 is connected with an inlet end of a first throttling part 118, an outlet end of the first throttling part 118 is connected with an inlet end of a first evaporator 108, and an outlet end of the first evaporator 108 is connected with a low-pressure inlet end of the first ejector 112; the gas outlet end of the first gas-liquid separator 116 is connected to the low-pressure inlet end of the second ejector 114, thereby forming a complete refrigerant circulation circuit.

The working process of the system is as follows: the refrigerant is compressed by the compressor 102 to form high-temperature and high-pressure gas, and is layered into two paths, the first path is cooled by the second condenser 106 to form high-pressure liquid-phase refrigerant, the high-pressure liquid-phase refrigerant enters the second ejector 114, the two-phase state secondary low-pressure refrigerant ejected by the second ejector 114 absorbs heat by the second evaporator 110 and then becomes gaseous, and finally enters the suction port of the compressor 102; the second path of high-temperature and high-pressure gas is introduced into the first ejector 112, the secondary high-temperature refrigerant sprayed by the first ejector 112 is cooled by the first condenser 104 to form a gas-liquid two-phase refrigerant, the gas-liquid two-phase refrigerant is separated in the first gas-liquid separator 116, the liquid-phase refrigerant is throttled by the first throttling component 118 to form a low-temperature and low-pressure two-phase refrigerant, and the low-temperature and low-pressure two-phase refrigerant absorbs heat by the first evaporator 108 and then turns into a gas state to enter the low-pressure; while the gas phase refrigerant discharged from the first gas-liquid separator 116 enters the low pressure inlet end of the second ejector 114.

The first ejector 112 can combine the high-pressure refrigerant discharged from the exhaust port with the low-pressure refrigerant entering from the low-pressure inlet and then flow through the first condenser 104, so that the refrigerants can realize different condensing temperatures in the first condenser 104 and the second condenser 106, and realize step heating in large-temperature span heating. Moreover, after the refrigerants with different pressures are condensed by the first condenser 104 and the second condenser 106, the refrigerants with different pressures are likely to still form, so that different evaporation temperatures of the refrigerants in the first evaporator 108 and the second evaporator 110 are facilitated, step cooling during large-temperature cross cooling is achieved, system energy efficiency is improved, two compressors 102 are not required to be arranged, the compressor 102 is not required to be a compressor 102 with a complex structure capable of discharging the refrigerants with different pressures, the structure is simple, and cost is saved. Moreover, under the injection effect of the second ejector 114, on one hand, different evaporation temperatures of the refrigerant in the first evaporator 108 and the second evaporator 110 are facilitated, and step cooling during large-temperature span cooling is achieved, and on the other hand, because the refrigerant ejected by the second ejector 114 reduces the pressure, the addition of a throttling element between the second condenser 106 and the second evaporator 110 can be omitted, so that parts are reduced, and the cost is saved. Moreover, the first gas-liquid separator 116 eliminates the gas-liquid two-phase refrigerant from entering the second ejector 114, thereby reducing the capacity required by the second ejector 114 and reducing the volume of the second ejector 114, and on the other hand, can avoid increasing the design difficulty of the second ejector 114 when the first condenser 104 discharges the gas-liquid two-phase refrigerant, which helps to simplify the structure of the second ejector 114.

Specifically, the refrigeration equipment adopts a vapor compression refrigeration cycle, and can be regarded as a refrigeration system when an evaporator is used for achieving the purpose of refrigeration, and can be regarded as a heat pump system when a condenser is used for achieving the purpose of heating, and certainly, the evaporator and the condenser can be used for achieving the purpose of refrigeration and the purpose of heating simultaneously. When the first condenser 104 and the second condenser 106 have different condensing pressures and condensing temperatures and require the condensers to heat the medium, such as heating water, one of the condensers with a lower condensing temperature may be used to preheat the medium, and the other condenser with a higher condensing temperature may be used to heat the medium again. It is understood that the energy cascade of the double evaporation may perform a secondary cooling of the cooling object, similar to the energy cascade of the double condensation.

Example two:

as shown in fig. 2, the difference from the first embodiment is that the outlet end of the second evaporator 110 is connected to the low-pressure inlet end of the first ejector 112, and the outlet end of the first evaporator 108 is connected to the suction port of the compressor 102.

The working process of the system is as follows: the refrigerant is compressed by the compressor 102 to form high-temperature and high-pressure gas, and is divided into two paths, the first path is cooled by the second condenser 106 to form high-pressure liquid-phase refrigerant, the high-pressure liquid-phase refrigerant enters the second ejector 114, the two-phase state secondary low-pressure refrigerant ejected by the second ejector 114 absorbs heat by the second evaporator 110 and then becomes gaseous, and the gaseous refrigerant enters the low-pressure inlet end of the first ejector 112; the second path of high-temperature and high-pressure gas is introduced into the first ejector 112, the secondary high-temperature refrigerant ejected by the first ejector 112 is cooled by the first condenser 104 to form a gas-liquid two-phase refrigerant, the gas-liquid two-phase refrigerant is separated in the first gas-liquid separator 116, the liquid phase of the secondary high-temperature refrigerant is throttled by the first throttling component 118 to form a low-temperature and low-pressure two-phase refrigerant, the liquid phase of the secondary high-temperature and high-pressure two-phase refrigerant absorbs heat by the first evaporator 108 and; while the gas phase refrigerant discharged from the first gas-liquid separator 116 enters the low pressure inlet end of the second ejector 114. The technical effect is the same as or similar to that of the first embodiment.

Example three:

as shown in fig. 3, a second throttling part 120 is added on the basis of the first embodiment. Specifically, an outlet end of the second ejector 114 is connected to an inlet end of the second throttling part 120, and an inlet end of the second evaporator 110 is connected to an outlet end of the second throttling part 120, that is, the second ejector 114 is connected to the second evaporator 110 via the second throttling part 120.

The working process of the system is as follows: the refrigerant is compressed by the compressor 102 to form high-temperature and high-pressure gas, and is layered into two paths, wherein the first path is cooled by the first condenser 104 to form high-pressure liquid-phase refrigerant to enter the second ejector 114, the liquid-phase high-pressure refrigerant ejected by the second ejector 114 is throttled by the second throttling element to form a low-temperature and low-pressure two-phase state, and then the low-temperature and low-pressure two-phase state is changed into a gaseous state after absorbing heat by the second evaporator 110, and finally the gaseous state enters the air; the second path of high-temperature and high-pressure gas is introduced into the first ejector 112, the secondary high-temperature refrigerant sprayed by the first ejector 112 is cooled by the first condenser 104 to form a gas-liquid two-phase refrigerant, the gas-liquid two-phase refrigerant is separated in the first gas-liquid separator 116, the liquid phase of the secondary high-temperature refrigerant is throttled by the first throttling element to form a low-temperature and low-pressure two-phase refrigerant, and the low-temperature and low-pressure two-phase refrigerant is changed into a gas state after absorbing heat by the first evaporator; while the gas phase of the first gas-liquid separator 116 enters the low pressure inlet end of the second ejector 114.

By connecting the second ejector 114 to the second evaporator 110 via the second throttling part 120, the refrigerant discharged from the second ejector 114 can be further depressurized, and the saturation temperature of the refrigerant can be lowered, thereby improving the cooling effect by the evaporation of the refrigerant in the second evaporator 110. In addition, the second ejector 114 does not need to have a complete throttling and pressure reducing function, and only liquid-phase high-pressure refrigerant needs to be ejected, so that the structure of the second ejector 114 is simplified.

Example four:

a second throttling part 120 is added on the basis of the second embodiment. Specifically, an outlet end of the second ejector 114 is connected to an inlet end of the second throttling part 120, and an inlet end of the second evaporator 110 is connected to an outlet end of the second throttling part 120, that is, the second ejector 114 is connected to the second evaporator 110 via the second throttling part 120.

Example five:

as shown in fig. 4, a regenerator 122 is added to the third embodiment. Specifically, a first inlet end of the regenerator 122 is connected to an outlet end of the second ejector 114, and a first outlet end of the regenerator 122 is connected to an inlet end of the second throttling member 120; a second inlet end of the regenerator 122 is connected to the outlet end of the first evaporator 108 and a second outlet end of the regenerator 122 is connected to the low pressure inlet end of the first ejector 112.

By connecting the second ejector 114 to the second throttling member 120 via the regenerator 122, the refrigerant can be cooled before throttling, the refrigerant entering the second throttling member 120 is ensured to be a liquid refrigerant, and the throttling effect of the second throttling member 120 is improved as compared to the case where the refrigerant entering the second throttling member 120 is a gas-liquid two-phase refrigerant. By connecting the first evaporator 108 with the low-pressure inlet end of the first ejector 112 through the heat regenerator 122, the heat regenerator 122 can increase the temperature of the refrigerant entering the low-pressure inlet end, which is beneficial for the refrigerant to enter the first condenser 104 after being discharged through the first ejector 112, and a large amount of heat is condensed in the first condenser 104, thereby improving the heating effect.

Example six:

on the basis of the fourth embodiment, the regenerator 122 is added. Specifically, a first inlet end of the regenerator 122 is connected to an outlet end of the second ejector 114, and a first outlet end of the regenerator 122 is connected to an inlet end of the second throttling member 120; a second inlet end of the regenerator 122 is connected to the outlet end of the first evaporator 108, and a second outlet end of the regenerator 122 is connected to the suction port of the compressor 102. By connecting the first evaporator 108 to the compressor 102 through the heat regenerator 122, the refrigerant to be introduced into the compressor 102 can be heated, the refrigerant introduced into the compressor 102 is ensured to be a gas-phase refrigerant, liquid impact of the compressor 102 is avoided, and the operational reliability is ensured.

Example seven:

as shown in fig. 5, a second gas-liquid separator 124 is added on the basis of the third embodiment. Specifically, an inlet end of the second gas-liquid separator 124 is connected to an outlet end of the second ejector 114, a liquid outlet end of the second gas-liquid separator 124 is connected to an inlet end of the second throttling part 120, and a gas outlet end of the second gas-liquid separator 124 is connected to a suction port of the compressor 102.

By connecting the second ejector 114 to the second throttling member 120 via the second gas-liquid separator 124, the refrigerant entering the second throttling member 120 is ensured to be a liquid refrigerant, and the throttling effect of the second throttling member 120 is improved as compared to when the refrigerant entering the second throttling member 120 is a gas-liquid two-phase refrigerant.

Example eight:

as shown in fig. 6, a second gas-liquid separator 124 is added to the fourth embodiment. Specifically, an inlet end of the second gas-liquid separator 124 is connected to an outlet end of the second ejector 114, a liquid outlet end of the second gas-liquid separator 124 is connected to an inlet end of the second throttling part 120, and a gas outlet end of the second gas-liquid separator 124 is connected to a low-pressure inlet end of the first ejector 112.

Example nine:

as shown in fig. 7, a second gas-liquid separator 124 and a third ejector 126 are added on the basis of the third embodiment. Specifically, the high-pressure inlet end of the third ejector 126 is connected to the outlet end of the second ejector 114, the outlet end of the second ejector 114 is connected to the inlet end of the second gas-liquid separator 124, the gas outlet end of the second gas-liquid separator 124 is connected to the suction port of the compressor 102, the liquid outlet end of the second gas-liquid separator 124 is connected to the inlet end of the second throttling element 120, the outlet end of the second throttling element 120 is connected to the inlet end of the second evaporator 110, and the outlet end of the second evaporator 110 is connected to the low-pressure inlet end of the third ejector 126.

By connecting the second ejector 114 to the second throttling member 120 via the third ejector 126 and the second gas-liquid separator 124, the refrigerant entering the second throttling member 120 can be ensured to be a liquid refrigerant, and the throttling effect of the second throttling member 120 can be improved as compared to when the refrigerant entering the second throttling member 120 is a gas-liquid two-phase refrigerant. Moreover, the third ejector 126 is arranged between the second ejector 114 and the second gas-liquid separator 124, so that on one hand, the pressure of the refrigerant can be further reduced, thereby being beneficial to the evaporation and heat absorption of the refrigerant in the second evaporator 110, and on the other hand, as the outlet end of the second evaporator 110 is connected with the low-pressure inlet end of the third ejector 126, namely, the second evaporator 110 enters the suction port of the compressor 102 after passing through the third ejector 126 and the gas outlet end of the second gas-liquid separator 124, the entering refrigerant can be ensured to be a gas-phase refrigerant, the liquid impact of the compressor 102 is avoided, and the working reliability is ensured.

Example ten:

on the basis of the fourth embodiment, the second gas-liquid separator 124 and the third ejector 126 are added. Specifically, the high-pressure inlet end of the third ejector 126 is connected to the outlet end of the second ejector 114, the outlet end of the second ejector 114 is connected to the inlet end of the second gas-liquid separator 124, the gas outlet end of the second gas-liquid separator 124 is connected to the low-pressure inlet end of the first ejector 112, the liquid outlet end of the second gas-liquid separator 124 is connected to the inlet end of the second throttling part 120, the outlet end of the second throttling part 120 is connected to the inlet end of the second evaporator 110, and the outlet end of the second evaporator 110 is connected to the low-pressure inlet end of the third ejector 126.

By connecting the second evaporator 110 to the first ejector 112 through the third ejector 126 and the second gas-liquid separator 124, and connecting the gas outlet end of the second gas-liquid separator 124 to the low-pressure inlet end of the first ejector 112, the refrigerant entering the first ejector 112 can be ensured to be a gas-phase refrigerant, the capacity required by the first ejector 112 can be reduced, the volume of the first ejector 112 can be reduced, the design difficulty of the first ejector 112 can be avoided when the second evaporator 110 discharges a gas-liquid two-phase refrigerant, and the structure of the first ejector 112 can be simplified.

Example eleven:

in addition to the third embodiment, a second gas-liquid separator 124 is added, an inlet end of the second gas-liquid separator 124 is connected to an outlet end of the second ejector 114, a liquid outlet end of the second gas-liquid separator 124 is connected to an inlet end of the second throttling element 120, and a gas outlet end of the second gas-liquid separator 124 is connected to a suction port of the compressor 102.

Alternatively, in the fourth embodiment, a second gas-liquid separator 124 is added, the inlet end of the second gas-liquid separator 124 is connected to the outlet end of the second ejector 114, the liquid outlet end of the second gas-liquid separator 124 is connected to the inlet end of the second throttling element 120, and the gas outlet end of the second gas-liquid separator 124 is connected to the low-pressure inlet end of the first ejector 112.

Example twelve:

in any of the above embodiments, the number of the exhaust ports is one. By setting the number of the discharge ports of the compressor 102 to one, that is, the compressor 102 has a discharge pressure, the structure of the compressor 102 is simplified, and the cost is saved. Specifically, the high-pressure inlet end of the first ejector 112 may be connected to a pipe connecting the exhaust port with the second condenser 106 through a pipe, or the inlet end of the second condenser 106 may be connected to a pipe connecting the exhaust port with the high-pressure inlet end of the first ejector 112 through a pipe.

Alternatively, on the basis of any of the above embodiments, the number of the exhaust ports is two, namely, the first exhaust port and the second exhaust port are communicated with each other, the high-pressure inlet end of the first ejector 112 is connected to the first exhaust port, and the inlet end of the second condenser 106 is connected to the second exhaust port. So that the compressor 102 has only one discharge pressure, the structure is simple, and it is convenient to connect the first ejector 112 and the second condenser 106.

Or, on the basis of any of the above embodiments, the number of the exhaust ports is two, and the two exhaust ports are respectively a third exhaust port and a fourth exhaust port, and the third exhaust port and the fourth exhaust port are used for exhausting gas with different pressures; the high pressure inlet port of the first ejector 112 is connected to the third exhaust port and the inlet port of the second condenser 106 is connected to the fourth exhaust port. The double condensation temperature and the double evaporation temperature of the refrigeration equipment are more favorably realized. The type of compressor 102 may be selected as desired to select two discharge ports of appropriate discharge pressure to regulate the evaporating and condensing temperatures of the refrigeration unit.

In summary, the cooling/heating system with the first ejector 112 and the second ejector 114 provided by the invention realizes the convergence between two different exhaust pressures through the injection effect of the ejectors, realizes the cascade utilization of energy, realizes the cascade heating (cooling) during the large-temperature span heating (cooling), and improves the energy efficiency of the system.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.