CN218033808U

CN218033808U - Self-cascade refrigeration system

Info

Publication number: CN218033808U
Application number: CN202221530733.2U
Authority: CN
Inventors: 谭海辉; 刘经林
Original assignee: Zhongshan Aomeisi Kitchenware Equipment Co ltd
Current assignee: Zhongshan Aomeisi Kitchenware Equipment Co ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-12-13
Anticipated expiration: 2032-06-17

Abstract

The utility model discloses a from cascade refrigeration system, which comprises a compressor, a condenser, first vapour and liquid separator, evaporative condenser, first throttle structure, second throttle structure and first evaporimeter, the gas vent of compressor and the entry intercommunication of condenser, the export and the refrigerant entry intercommunication of condenser, the liquid outlet communicates with the entry of first throttle structure, the export of first throttle structure and evaporative condenser's evaporation entry intercommunication, evaporative condenser's evaporation export and heat transfer pipeline's entry intercommunication, gas outlet and evaporative condenser's condensation entry intercommunication, evaporative condenser's condensation export and second throttle structure's entry intercommunication, the export of second throttle structure and the entry intercommunication of evaporimeter, the entry of evaporimeter and heat transfer pipeline's entry intercommunication, heat transfer pipeline's export and the air inlet intercommunication of compressor. The utility model provides a from overlapping refrigerating system can reduce the waste of cold volume, improves refrigeration efficiency.

Description

Self-cascade refrigeration system

Technical Field

The utility model relates to a refrigeration technology field, in particular to from overlapping refrigerating system.

Background

The self-cascade refrigeration system is widely applied to industries such as food cold chain storage, low-temperature medical treatment, chemical engineering and the like. The self-cascade refrigeration system uses more than two refrigerants with different condensation temperatures, in the operation process of the system, when a first refrigerant gas and a second refrigerant gas flow through a condenser, the first refrigerant is condensed into liquid, the second refrigerant is not condensed into liquid, then the first refrigerant liquid is separated from the second refrigerant gas through a gas-liquid separator, after separation, the first refrigerant liquid flows through an evaporative condenser and evaporates to absorb heat, so that the second refrigerant flowing through the evaporative condenser is condensed into liquid, the condensed second refrigerant is evaporated and refrigerated in an evaporator, and the evaporated second refrigerant and the evaporated first refrigerant enter a compressor again to form circulation. The evaporated second refrigerant and the evaporated first refrigerant usually have residual cooling capacity, and the existing self-cascade refrigeration system does not utilize the residual cooling capacity of the evaporated second refrigerant and the evaporated first refrigerant, thereby causing waste.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a from overlapping refrigerating system can utilize the remaining cold volume of first refrigerant after the evaporation and second refrigerant, reduces the waste of cold volume, improves refrigeration efficiency.

According to the utility model discloses a from cascade refrigeration system of first aspect embodiment, including compressor, condenser, first vapour and liquid separator, evaporative condenser, first throttle structure, second throttle structure and first evaporimeter, first vapour and liquid separator has refrigerant entry, gas outlet and liquid outlet, be provided with the heat transfer pipeline in the first vapour and liquid separator, wherein, the gas vent of compressor with the entry intercommunication of condenser, the export of condenser with refrigerant entry intercommunication, the liquid outlet with the entry intercommunication of first throttle structure, the export of first throttle structure with evaporative condenser's evaporation entry intercommunication, evaporative condenser's evaporation export with heat transfer pipeline's entry intercommunication, the gas outlet with evaporative condenser's condensation entry intercommunication, evaporative condenser's condensation export with the entry intercommunication of second throttle structure, the export of second throttle structure with the entry intercommunication of evaporimeter, the entry of evaporimeter with heat transfer pipeline's entry intercommunication, the export of heat transfer pipeline with the air inlet intercommunication of compressor.

According to the utility model discloses from overlapping refrigerating system has following beneficial effect at least: the refrigeration system uses a first refrigerant and a second refrigerant, wherein the condensation temperature of the first refrigerant is higher than that of the second refrigerant, in the operation process of the refrigeration system, the compressor outputs mixed gas consisting of the first refrigerant and the second refrigerant, the mixed gas passes through the condenser, the first refrigerant is condensed into liquid, the second refrigerant gas is not condensed into liquid, then the first gas-liquid separator separates the first refrigerant liquid from the second refrigerant gas, the first refrigerant liquid enters the evaporative condenser for evaporation after throttling through the first throttling structure, the second refrigerant gas absorbs heat when flowing through the evaporative condenser, so that the second refrigerant is condensed into liquid, the condensed second refrigerant liquid enters the first evaporator for evaporation after throttling through the second throttling structure, the evaporated second refrigerant and the evaporated first refrigerant firstly pass through a heat exchange pipeline in the first gas-liquid separator and then return to the compressor again, therefore, the evaporated second refrigerant and the residual cold energy of the first refrigerant can be used, the temperature of the uncondensed second refrigerant and the condensed first liquid can be further reduced, the condensed first refrigerant can be condensed, the residual cold energy of the second refrigerant can be further reduced, the internal cold energy of the second refrigerant can be further reduced, and the refrigeration efficiency of the second refrigerant can be increased, and the refrigeration system can be further increased.

According to some embodiments of the utility model, still include controlling means, third throttling structure and first ooff valve, the export of condenser the entry intercommunication of first ooff valve, the export of first ooff valve with the entry intercommunication of third throttling structure, the export of third throttling structure with the export intercommunication of first throttling structure, controlling means with the compressor first ooff valve electricity is connected.

According to some embodiments of the utility model, still include fourth throttle structure and second ooff valve, evaporative condenser's condensation export with the entry intercommunication of second ooff valve, the export of second ooff valve with the entry intercommunication of fourth throttle structure, the export of fourth throttle structure with the export intercommunication of second throttle structure, controlling means with the second ooff valve electricity is connected.

According to the utility model discloses a some embodiments still include second evaporimeter, first control valve and second control valve, the export of first throttle structure with the entry intercommunication of first control valve, the export of first control valve and evaporative condenser's evaporation entry intercommunication, the export of first throttle structure with the entry intercommunication of second control valve, the entry of second control valve with the entry intercommunication of second evaporimeter, the export of second evaporimeter with the entry intercommunication of heat transfer pipeline, first control valve reaches second control valve electricity connection control device, wherein, first control valve is used for controlling the export of first throttle structure with flow between the evaporation entry of evaporative condenser (140), the second control valve is used for controlling flow between the export of first throttle structure and the entry of second evaporimeter.

According to some embodiments of the utility model the export of condenser with be provided with drier-filter between the refrigerant entry, the gas vent of compressor with be provided with oil separator between the entry of condenser.

According to some embodiments of the utility model the export of heat transfer pipeline with be provided with second vapour and liquid separator or liquid storage pot between the air inlet of compressor.

According to the utility model discloses a some embodiments the first throttle structure reaches the third throttle structure is the capillary.

According to some embodiments of the present invention the second throttling arrangement and the fourth throttling arrangement are capillaries.

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 is a schematic diagram of a self-cascade refrigeration system according to an embodiment of the present invention;

fig. 2 is a schematic view of a first gas-liquid separator from the cascade refrigeration system shown in fig. 1.

Reference numerals are as follows:

the system comprises a compressor 110, a condenser 120, a first gas-liquid separator 130, a refrigerant inlet 131, an air outlet 132, a liquid outlet 133, a heat exchange pipeline 134, an evaporative condenser 140, a first evaporator 150, a second evaporator 160, a drying filter 170, an oil separator 180, a second gas-liquid separator 190, a first throttling structure 210, a second throttling structure 220, a third throttling structure 230, a fourth throttling structure 240, a first switch valve 310, a second switch valve 320, a first control valve 330 and a second control valve 340.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of meanings are one or more, a plurality of meanings are two or more, and the terms greater than, smaller than, exceeding, etc. are understood as excluding the number, and the terms greater than, lower than, within, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, an embodiment of the present invention provides a self-cascade refrigeration system, including a compressor 110, a condenser 120, a first gas-liquid separator 130, an evaporative condenser 140, a first throttling structure 210, a second throttling structure 220, and a first evaporator 150, where the first gas-liquid separator 130 has a refrigerant inlet 131, a gas outlet 132, and a liquid outlet 133, and a heat exchange pipeline 134 is disposed in the first gas-liquid separator 130, where an exhaust port of the compressor 110 is communicated with an inlet of the condenser 120, an outlet of the condenser 120 is communicated with the refrigerant inlet 131, the liquid outlet 133 is communicated with an inlet of the first throttling structure 210, an outlet of the first throttling structure 210 is communicated with an evaporation inlet of the evaporative condenser 140, an evaporation outlet of the evaporative condenser 140 is communicated with an inlet of the heat exchange pipeline 134, the gas outlet 132 is communicated with a condensation inlet of the evaporative condenser 140, a condensation outlet of the evaporative condenser 140 is communicated with an inlet of the second throttling structure 220, an outlet of the second throttling structure 220 is communicated with an inlet of the evaporator, an inlet of the evaporator is communicated with an inlet of the heat exchange pipeline 134, and an outlet of the heat exchange pipeline 134 are communicated with an air inlet of the compressor 110.

The refrigeration system uses a first refrigerant and a second refrigerant, wherein the condensation temperature of the first refrigerant is higher than that of the second refrigerant, during the operation of the refrigeration system, the compressor 110 outputs a mixed gas composed of the first refrigerant and the second refrigerant, the mixed gas passes through the condenser 120, the first refrigerant is condensed into liquid, the second refrigerant gas is not condensed into liquid, then the first gas-liquid separator 130 separates the first refrigerant liquid from the second refrigerant gas, the first refrigerant liquid passes through the first throttling structure 210 for throttling and then enters the evaporative condenser 140 for evaporation, the second refrigerant gas absorbs heat when passing through the evaporative condenser 140, so that the second refrigerant is condensed into liquid, the condensed second refrigerant liquid passes through the second throttling structure 220 for throttling and then enters the first evaporator 150 for evaporation, the evaporated second refrigerant and the evaporated first refrigerant pass through the heat exchange pipeline 134 in the first gas-liquid separator 130 and then return to the compressor 110 again, therefore, the evaporated second refrigerant gas and the first refrigerant remaining cold energy can be utilized, the temperature of the uncondensed second refrigerant gas in the first gas-liquid separator 130 and the condensed first refrigerant can be further reduced, and the cold energy of the condensed refrigerant can be further reduced, and the refrigeration efficiency of the condenser can be increased after the condensation. In addition, during the operation of the system, the second refrigerant is pre-cooled before entering the evaporative condenser 140, so that the temperature difference between the evaporation side and the condensation side in the evaporative condenser 140 is reduced, thereby reducing the heat load of the evaporative condenser 140.

Referring to fig. 1 and 2, it is conceivable that, in some embodiments, a control device, a third throttling structure 230 and a first switching valve 310 are further included, an outlet of the condenser 120 is communicated with an inlet of the first switching valve 310, an outlet of the first switching valve 310 is communicated with an inlet of the third throttling structure 230, an outlet of the third throttling structure 230 is communicated with an outlet of the first throttling structure 210, and the control device is electrically connected with the compressor 110 and the first switching valve 310, so that the first throttling structure 210 is connected in parallel with the third throttling structure 230. In the process of starting the system, the control device starts the compressor 110, and simultaneously opens the first switch valve 310, so that the third throttling structure 230 and the first throttling structure 210 throttle the condensed first refrigerant at the same time, thereby increasing the throttling channel of the first refrigerant, increasing more first refrigerants passing through the evaporative condenser 140 in unit time, accelerating the speed of the evaporative condenser 140 condensing the second refrigerant, and providing the first evaporator 150 with the condensed ground condensation temperature refrigerant more quickly, thereby shortening the starting time of the refrigeration system. After the pressure of the refrigeration system is stabilized, the control device closes the first switching valve 310.

Referring to fig. 1 and 2, it is conceivable that, in some embodiments, a fourth throttling structure 240 and a second switching valve 320 are further included, a condensation outlet of the evaporative condenser 140 communicates with an inlet of the second switching valve 320, an outlet of the second switching valve 320 communicates with an inlet of the fourth throttling structure 240, an outlet of the fourth throttling structure 240 communicates with an outlet of the second throttling structure 220, and the control device is electrically connected to the second switching valve 320. Therefore, in the process of starting the system, the control device starts the compressor 110, and simultaneously opens the first switch valve 310 and the second switch valve 320, so that the third throttling structure 230 and the first throttling structure 210 simultaneously throttle the condensed first refrigerant, and the second throttling structure 220 and the fourth throttling structure simultaneously throttle the condensed second refrigerant, thereby increasing the throttling passages of the first refrigerant and the second refrigerant, accelerating the speed of the evaporative condenser 140 condensing the second refrigerant, increasing the number of the second refrigerants passing through the first evaporator 150 in unit time, and further shortening the starting time of the refrigeration system.

Referring to fig. 1 and 2, it is conceivable that, in some embodiments, the refrigeration system further includes a second evaporator 160, a first control valve 330 and a second control valve 340, an outlet of the first throttling structure 210 is communicated with an inlet of the first control valve 330, an outlet of the first control valve 330 is communicated with an evaporation inlet of the evaporation condenser 140, an outlet of the first throttling structure 210 is communicated with an inlet of the second control valve 340, an inlet of the second control valve 340 is communicated with an inlet of the second evaporator 160, an outlet of the second evaporator 160 is communicated with an inlet of the heat exchange pipeline 134, and the first control valve 330 and the second control valve 340 are electrically connected with a control device, wherein the first control valve 330 is used for controlling a flow rate between the outlet of the first throttling structure 210 and the evaporation inlet of the evaporation condenser 140, and the second control valve 340 is used for controlling a flow rate between the outlet of the first throttling structure 210 and the inlet of the second evaporator 160. Through the arrangement of the second evaporator 160, the first refrigerant can also refrigerate outwards, so that the refrigeration system is optimized to have two refrigeration temperatures, and the refrigeration temperature can be adjusted between the two temperatures.

Specifically, in the system operation process, when the control device controls the first control valve 330 to be closed and controls the second control valve 340 to be opened, the throttled first refrigerant flows through the second evaporator 160 and is evaporated and cooled, the second refrigerant is not condensed in the evaporative condenser 140, the second refrigerant does not undergo evaporation and cooling when flowing through the first evaporator 150, and at this time, the first cooling temperature can be obtained; when the control device controls the first control valve 330 to open and controls the second control valve 340 to close, the throttled first refrigerant does not flow through the second evaporator 160 to be evaporated and refrigerated, and the throttled second refrigerant flows through the first evaporator 150 to be evaporated and refrigerated, so that a second refrigeration temperature can be obtained; in addition, the flow rate of the first refrigerant flowing through the evaporator condenser 140 and the second evaporator 160 can be controlled by controlling the opening degree of the first control valve 330 and the opening degree of the second control valve 340 through the control device, so that the cooling capacity of the first refrigerant in the second evaporator 160 and the cooling capacity of the second refrigerant in the first evaporator 150 can be adjusted, and the refrigeration system can adjust the refrigeration temperature between the first refrigeration temperature and the second refrigeration temperature.

Referring to fig. 1 and 2, it is conceivable that, in some embodiments, a dry filter 170 is disposed between an outlet of the condenser 120 and the refrigerant inlet 131, and an oil separator 180 is disposed between an exhaust port of the compressor 110 and an inlet of the condenser 120. The dry filter 170 can filter impurities in the pipeline, so that the refrigeration system operates stably; the oil separator 180 may separate the lubricating oil in the mixed gas discharged from the compressor 110 to ensure safe and efficient operation of the apparatus.

Referring to fig. 1 and 2, it is conceivable that, in some embodiments, a second gas-liquid separator 190 or a liquid storage tank is disposed between the outlet of the heat exchange pipeline 134 and the air inlet of the compressor 110, and the liquid storage tank or the second gas-liquid separator 190 is disposed to prevent the refrigerant liquid remaining due to incomplete evaporation from returning to the compressor 110 to cause impact.

Referring to fig. 1 and 2, it is envisioned that in some embodiments, the first throttling structure 210 and the third throttling structure 230 are both capillary tubes.

Referring to fig. 1 and 2, it is envisioned that in some embodiments, the second restriction structure 220 and the fourth restriction structure 240 are both capillary tubes.

It should be noted that, in some embodiments, the 4 throttling structures may also be configured as electronic expansion valves.

It should be noted that the first refrigerant and the second refrigerant may be selected from refrigerants commonly used in existing self-cascade refrigeration systems, for example, the first refrigerant may be R600a with a condensation temperature of-20 degrees, and the second refrigerant may be R23 with a condensation temperature of-86 degrees.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present embodiment has been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit.

Claims

1. A self-cascade refrigeration system is characterized by comprising a compressor (110), a condenser (120), a first gas-liquid separator (130), an evaporative condenser (140), a first throttling structure (210), a second throttling structure (220) and a first evaporator (150), wherein the first gas-liquid separator (130) is provided with a refrigerant inlet (131), a gas outlet (132) and a liquid outlet (133), a heat exchange pipeline (134) is arranged in the first gas-liquid separator (130), a gas outlet of the compressor (110) is communicated with an inlet of the condenser (120), an outlet of the condenser (120) is communicated with the refrigerant inlet (131), the liquid outlet (133) is communicated with an inlet of the first throttling structure (210), an outlet of the first throttling structure (210) is communicated with an evaporative inlet of the evaporative condenser (140), an evaporative outlet of the evaporative condenser (140) is communicated with an inlet of the heat exchange pipeline (134), a gas outlet (132) is communicated with a condensing inlet of the evaporative condenser (140), a condensing outlet of the evaporative condenser (140) is communicated with a throttling structure (220), and an outlet of the throttling structure (220) is communicated with an inlet of the evaporative condenser (134), the outlet of the heat exchange pipeline (134) is communicated with the air inlet of the compressor (110).

2. The self-cascade refrigeration system of claim 1, further comprising a control device, a third throttling structure (230), and a first switching valve (310), wherein an outlet of the condenser (120) communicates with an inlet of the first switching valve (310), an outlet of the first switching valve (310) communicates with an inlet of the third throttling structure (230), an outlet of the third throttling structure (230) communicates with an outlet of the first throttling structure (210), and the control device is electrically connected to the compressor (110) and the first switching valve (310).

3. The self-cascade refrigeration system of claim 2, further comprising a fourth throttling structure (240) and a second on-off valve (320), a condensation outlet of the evaporative condenser (140) being in communication with an inlet of the second on-off valve (320), an outlet of the second on-off valve (320) being in communication with an inlet of the fourth throttling structure (240), an outlet of the fourth throttling structure (240) being in communication with an outlet of the second throttling structure (220), the control device being electrically connected with the second on-off valve (320).

4. The self-cascade refrigeration system of claim 1, further comprising a second evaporator (160), a first control valve (330), and a second control valve (340), an outlet of the first throttling structure (210) being in communication with an inlet of the first control valve (330), an outlet of the first control valve (330) being in communication with an evaporative inlet of an evaporative condenser (140), an outlet of the first throttling structure (210) being in communication with an inlet of the second control valve (340), an inlet of the second control valve (340) being in communication with an inlet of the second evaporator (160), an outlet of the second evaporator (160) being in communication with an inlet of the heat exchange line (134), the first control valve (330) and the second control valve (340) being electrically connected to a control device, wherein the first control valve (330) is configured to control a flow between the outlet of the first throttling structure (210) and the evaporative inlet of the evaporative condenser (140), and the second control valve (340) is configured to control a flow between the outlet of the second throttling structure (160) and the evaporative condenser (140).

5. The self-cascade refrigeration system according to claim 1, wherein a dry filter (170) is disposed between an outlet of the condenser (120) and the refrigerant inlet (131), and an oil separator (180) is disposed between an exhaust of the compressor (110) and an inlet of the condenser (120).

6. The self-cascade refrigeration system of claim 1, wherein a second gas-liquid separator (190) or a liquid storage tank is disposed between an outlet of the heat exchange line (134) and an air inlet of the compressor (110).

7. The self-laminating refrigeration system of claim 2, wherein the first throttling structure (210) and the third throttling structure (230) are both capillary tubes.

8. The self-cascade refrigeration system of claim 3, wherein the second throttling structure (220) and the fourth throttling structure (240) are both capillary tubes.