CN211552098U - Variable-capacity refrigerating system with double compressors - Google Patents

Abstract

The utility model relates to the technical field of refrigeration, in particular to a double-compressor variable-capacity refrigeration system, which can adjust the power according to the change of a refrigeration interval, reduce the power consumption of a compressor, reduce the power of electric heating in a high-temperature area and reduce the power consumption again; the high-temperature liquid refrigeration system comprises an evaporator, a compressor, a condenser, a drying filter, an intercooler, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a first electromagnetic valve, a second electromagnetic valve, a first thermal expansion valve and a second thermal expansion valve, wherein the intercooler is provided with a high-temperature liquid introducing port, a supercooled liquid leading-out port, a refrigerant introducing port and a refrigeration gas leading-out port, the compressor comprises a low-pressure compressor and a high-pressure compressor, the input end of the fourth pipeline is communicated with the refrigeration gas leading-out port, the output ends of the low-pressure compressor, the third pipeline and the fourth pipeline are communicated with the input end of the high-pressure compressor, and the third electromagnetic valve is arranged on the third pipeline.

Description

Variable-capacity refrigerating system with double compressors

Technical Field

The utility model relates to a refrigerated technical field especially relates to a variable refrigerating system that holds of two compressors.

Background

As is known, a conventional refrigeration system is composed of an evaporator, a compressor, a condenser, a drying filter and a capillary tube which are sequentially communicated, in order to achieve a lower refrigeration temperature, the existing refrigeration system is dependent on selecting a compressor with higher power, the refrigeration temperature is a range value, when the existing refrigeration system is used for refrigerating in any temperature zone, the compressor is operated at full power, the power consumption is high, the equivalent refrigeration power of the compressor is reduced along with the reduction of the temperature, the compressor works in a balanced manner, the temperature needs to be balanced by electrical heating in a high-temperature zone, and the power consumption is serious.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides a can adjust power according to the change between the refrigeration region, reduce the compressor consumption, reduce the power of electrical heating when the high temperature zone time, reduce the variable refrigerating system that holds of two compressors of power consumption once more.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: a dual-compressor variable-capacity refrigeration system comprises an evaporator, a compressor, a condenser and a dry filter; the refrigeration system is characterized by further comprising an intercooler, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline and a first electromagnetic valve, wherein the intercooler is provided with a high-temperature liquid inlet, a supercooled liquid outlet, a refrigerant inlet and a refrigeration gas outlet, the input ends of the first pipeline and the second pipeline are communicated with the output end of the first electromagnetic valve, the output ends of the first pipeline and the second pipeline are respectively communicated with the high-temperature liquid inlet and the supercooled liquid refrigerant inlet, the second pipeline is provided with a second electromagnetic valve and a first thermal expansion valve, the input end of the first electromagnetic valve is communicated with the output end of the drying filter, the compressor comprises a low-pressure compressor and a high-pressure compressor, the input ends of the low-pressure compressor and the third pipeline are communicated with the gas output end of the evaporator, and the input end of the fourth pipeline is communicated with the refrigeration gas outlet, the output ends of the low-pressure compressor, the third pipeline and the fourth pipeline are communicated with the input end of the high-pressure compressor, a third electromagnetic valve is arranged on the third pipeline, the output end of the high-pressure compressor is communicated with the input end of the condenser, the output end of the condenser is communicated with the input end of the drying filter, the input end and the output end of the fifth pipeline are communicated with a supercooled liquid guide outlet and the liquid output end of the evaporator respectively, and a second thermal expansion valve is arranged on the fifth pipeline.

Preferably, the high-temperature liquid inlet is communicated with the supercooled liquid outlet, and the refrigerant inlet is communicated with the refrigerant gas outlet.

Preferably, the intercooler comprises a pipeline and a cooling pipe spirally arranged in the pipeline, the cooling pipe comprises an inner copper pipe and an outer copper pipe, the outer copper pipe is sleeved outside the inner copper pipe, a heat insulation sleeve is arranged outside the outer copper pipe, two ends of the inner copper pipe are respectively communicated with the high-temperature liquid inlet and the supercooled liquid outlet, an annular channel is formed between the inner copper pipe and the outer copper pipe, and two ends of the annular channel are respectively communicated with the refrigerant inlet and the refrigerating gas outlet.

Preferably, the temperature sensing bulb of the first thermostatic expansion valve is installed at the refrigerant gas outlet.

Preferably, the temperature sensing bulb of the second thermostatic expansion valve is arranged at the gas output end of the evaporator.

(III) advantageous effects

Compared with the prior art, the utility model provides a variable refrigerating system that holds of two compressors possesses following beneficial effect: the double-compressor variable-capacity refrigeration system is characterized in that a compressor is replaced by a low-pressure compressor and a high-pressure compressor which are connected in series, when the single-stage compression is carried out, the high-pressure compressor is started, a first electromagnetic valve and a third electromagnetic valve are opened, a second electromagnetic valve is closed, the low-pressure compressor is short-circuited by a third pipeline at the moment, low-temperature low-pressure gas led out by an evaporator enters the high-pressure compressor through the third pipeline for compression, the compressed high-pressure gas enters a condenser to become liquid refrigerant, the liquid refrigerant sequentially passes through a drying filter, a first pipeline, an intermediate heat exchanger and a fifth pipeline and enters the evaporator under the control of a second thermal expansion valve for heat absorption and evaporation, the evaporated low-temperature low-pressure refrigerant gas enters the high-pressure compressor through the third; when the two-stage compression is carried out, the high-pressure compressor and the low-pressure compressor are started simultaneously, the first electromagnetic valve and the second electromagnetic valve are opened, the third electromagnetic valve is closed, the low-pressure compressor and the high-pressure compressor work in series at the moment, the low-pressure compressor sucks air to supply air to the high-pressure compressor, the compression efficiency is improved, high-temperature and high-pressure refrigerant gas enters the condenser to be condensed, the condensed liquid refrigerant drying filter and the first electromagnetic valve are used, a part of liquid refrigerant is led in from the high-temperature liquid inlet and led out from the supercooling refrigerant outlet and enters the evaporator through the fifth pipeline, the other part of liquid refrigerant enters the intercooler through the fourth pipeline and enters the intercooler through the refrigerant inlet under the control of the first thermal expansion valve to cool the liquid refrigerant passing through the intercooler, and the evaporated low-temperature and, the two-stage compression can be adopted in the low-temperature area, the single-stage compression can be adopted in the high-temperature area, and only one high-pressure compressor is used for working, so that the power consumption of the compressor is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the intercooler of the present invention;

FIG. 3 is a schematic structural view of a cross section of the cooling pipe of the present invention;

in the drawings, the reference numbers: 1. an evaporator; 2. a condenser; 3. drying the filter; 4. an intercooler; 5. a first pipeline; 6. a second pipeline; 7. a third pipeline; 8. a fourth pipeline; 9. a fifth pipeline; 10. a first solenoid valve; 11. a high-temperature liquid inlet; 12. a supercooled liquid lead-out port; 13. a refrigerant inlet port; 14. a refrigerant gas lead-out port; 15. a second solenoid valve; 16. a first thermostatic expansion valve; 17. a low pressure compressor; 18. a high pressure compressor; 19. a third electromagnetic valve; 20. a second thermostatic expansion valve; 21. a pipeline; 22. an inner copper tube; 23. an outer copper tube; 24. an insulating sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the dual-compressor variable-capacity refrigeration system of the present invention includes an evaporator 1, a compressor, a condenser 2 and a dry filter 3; the refrigeration system is characterized by further comprising an intercooler 4, a first pipeline 5, a second pipeline 6, a third pipeline 7, a fourth pipeline 8, a fifth pipeline 9 and a first electromagnetic valve 10, wherein the intercooler 4 is provided with a high-temperature liquid inlet 11, a supercooled liquid outlet 12, a refrigerant inlet 13 and a refrigeration gas outlet 14, the high-temperature liquid inlet 11 is communicated with the supercooled liquid outlet 12, the refrigerant inlet 13 is communicated with the refrigeration gas outlet 14, the input ends of the first pipeline 5 and the second pipeline 6 are communicated with the output end of the first electromagnetic valve 10, the output ends of the first pipeline 5 and the second pipeline 6 are respectively communicated with the high-temperature liquid inlet 11 and the supercooled liquid refrigerant inlet 13, the second pipeline 6 is provided with a second electromagnetic valve 15 and a first thermal expansion valve 16, a temperature sensing bulb of the first thermal expansion valve 16 is installed at the refrigeration gas outlet 14, the first thermostatic expansion valve 16 is a danfoss N series R404a thermostatic expansion valve with nominal refrigerating capacity of 1.0kw0.28, the input end of the first electromagnetic valve 10 is communicated with the output end of the drying filter 3, the compressor comprises a low-pressure compressor 17 and a high-pressure compressor 18, the input ends of the low-pressure compressor 17 and the third pipeline 7 are both communicated with the gas output end of the evaporator 1, the input end of the fourth pipeline 8 is communicated with the refrigerating gas outlet 14, the output ends of the low-pressure compressor 17, the third pipeline 7 and the fourth pipeline 8 are all communicated with the input end of the high-pressure compressor 18, a third electromagnetic valve 19 is arranged on the third pipeline 7, the output end of the high-pressure compressor 18 is communicated with the input end of the condenser 2, the output end of the condenser 2 is communicated with the input end of the drying filter 3, the input end and the output end of the fifth pipeline 9 are respectively communicated with the supercooled liquid outlet 12 and the liquid output end of the evaporator, and a second thermostatic expansion valve 20 is arranged on the fifth pipeline 9, the second thermostatic expansion valve 20 is a danfoss N series R404a thermostatic expansion valve with nominal refrigerating capacity of 1.4kw0.39, and a temperature sensing bulb of the second thermostatic expansion valve 20 is installed at the gas output end of the evaporator 1.

The utility model discloses a variable refrigerating system that holds of two compressors, intercooler 4 includes pipeline 21 and the cooling tube that spirals and set up in pipeline 21, the cooling tube includes interior copper pipe 22 and outer copper pipe 23, outer copper pipe 23 cover is established in the outside of interior copper pipe 22 to be provided with insulation cover 24 in the outside of outer copper pipe 23, the both ends of interior copper pipe 22 communicate with each other with high temperature liquid introducing port 11 and super-cooled liquid leading-out port 12 respectively, form annular channel between interior copper pipe 22 and the outer copper pipe 23, the both ends of annular channel communicate with each other with refrigerant introducing port 13 and refrigerating gas leading-out port 14 respectively; the high-temperature and high-pressure coolant flowing through the intercooler 4 can be cooled.

Example 1

In order to achieve the technical index of minus 40 ℃, a 2P compressor is theoretically needed, the 2P compressor in a conventional system runs at full power under all working conditions, and in the scheme, the 1.5P compressor and the 0.5P compressor are started to work together under the working condition of minus 15 ℃, so that the power consumption can be saved under the condition of minus 15 ℃.

When the single-stage compressor is used, the high-pressure compressor 18 is started, the first electromagnetic valve 10 and the third electromagnetic valve 19 are opened, the second electromagnetic valve 15 is closed, the low-pressure compressor 17 is short-circuited by the third pipeline 7 at the moment, low-temperature low-pressure gas led out by the evaporator 1 enters the high-pressure compressor 18 through the third pipeline 7 to be compressed, the compressed high-pressure gas enters the condenser 2 to become liquid refrigerant, the liquid refrigerant sequentially passes through the drying filter 3, the first pipeline 5, the intermediate heat exchanger and the fifth pipeline 9 and enters the evaporator 1 under the control of the second thermostatic expansion valve 20 to absorb heat and evaporate, and the evaporated low-temperature low-pressure refrigerant gas enters the high-pressure compressor 18 through the third pipeline 7 to be compressed, so that the conventional refrigeration cycle is completed; when the two-stage compression is performed, the high-pressure compressor 18 and the low-pressure compressor 17 are started simultaneously, the first electromagnetic valve 10 and the second electromagnetic valve 15 are opened, the third electromagnetic valve 19 is closed, the low-pressure compressor 17 and the high-pressure compressor 18 work in series, the low-pressure compressor 17 sucks air to supply air to the high-pressure compressor 18, the compression efficiency is improved, high-temperature and high-pressure refrigerant gas enters the condenser 2 to be condensed, the condensed liquid refrigerant drying filter 3 and the first electromagnetic valve 10 are used, a part of liquid refrigerant is led in from the high-temperature liquid inlet 11 and led out from the supercooling refrigerant outlet and enters the evaporator 1 through the fifth pipeline 9, the other part of liquid refrigerant enters the intercooler 4 through the fourth pipeline 8 and enters the intercooler 4 from the refrigerant inlet 13 under the control of the first thermostatic expansion valve 16 to cool the liquid refrigerant passing through the intercooler 4, and the evaporated low-temperature and low-pressure gas is led out, the low-temperature area can adopt double-stage compression, the high-temperature area can adopt single-stage compression, and only one high-pressure compressor 18 is used for working, so that the power consumption of the compressor is reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A dual-compressor variable-capacity refrigeration system comprises an evaporator (1), a compressor, a condenser (2) and a dry filter (3); the device is characterized by further comprising an intercooler (4), a first pipeline (5), a second pipeline (6), a third pipeline (7), a fourth pipeline (8), a fifth pipeline (9) and a first electromagnetic valve (10), wherein the intercooler (4) is provided with a high-temperature liquid inlet (11), a supercooled liquid outlet (12), a refrigerant inlet (13) and a refrigerant gas outlet (14), the input ends of the first pipeline (5) and the second pipeline (6) are communicated with the output end of the first electromagnetic valve (10), the output ends of the first pipeline (5) and the second pipeline (6) are respectively communicated with the high-temperature liquid inlet (11) and the supercooled liquid refrigerant inlet (13), the second pipeline (6) is provided with a second electromagnetic valve (15) and a first thermal expansion valve (16), the input end of the first electromagnetic valve (10) is communicated with the output end of the drying filter (3), the compressor comprises a low-pressure compressor (17) and a high-pressure compressor (18), wherein the input ends of the low-pressure compressor (17) and a third pipeline (7) are communicated with the gas output end of the evaporator (1), the input end of a fourth pipeline (8) is communicated with a refrigerating gas leading-out port (14), the output ends of the low-pressure compressor (17), the third pipeline (7) and the fourth pipeline (8) are communicated with the input end of the high-pressure compressor (18), a third electromagnetic valve (19) is arranged on the third pipeline (7), the output end of the high-pressure compressor (18) is communicated with the input end of a condenser (2), the output end of the condenser (2) is communicated with the input end of a drying filter (3), and the input end and the output end of a fifth pipeline (9) are respectively communicated with a supercooled liquid leading-out port (12) and the liquid output end of the evaporator (1), and a second thermostatic expansion valve (20) is arranged on the fifth pipeline (9).

2. The dual-compressor variable capacity refrigeration system according to claim 1, wherein the high temperature liquid introduction port (11) communicates with a supercooled liquid discharge port (12), and the refrigerant introduction port (13) communicates with a refrigerant gas discharge port (14).

3. The dual-compressor variable-capacity refrigeration system according to claim 2, wherein the intercooler (4) comprises a pipeline (21) and a cooling pipe spirally arranged in the pipeline (21), the cooling pipe comprises an inner copper pipe (22) and an outer copper pipe (23), the outer copper pipe (23) is sleeved outside the inner copper pipe (22), an insulating sleeve (24) is arranged outside the outer copper pipe (23), two ends of the inner copper pipe (22) are respectively communicated with the high-temperature liquid inlet (11) and the supercooled liquid outlet (12), an annular channel is formed between the inner copper pipe (22) and the outer copper pipe (23), and two ends of the annular channel are respectively communicated with the refrigerant inlet (13) and the refrigerant gas outlet (14).

4. The dual-compressor variable-capacity refrigeration system according to claim 1, wherein the bulb of the first thermal expansion valve (16) is mounted to the refrigerant gas outlet port (14).

5. The dual compressor variable capacity refrigeration system of claim 1, wherein the bulb of the second thermostatic expansion valve (20) is mounted to the gas output of the evaporator (1).

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