Gas-liquid separator, refrigerating system and control method

Abstract

The invention relates to the field of refrigeration equipment, the refrigeration equipment comprises a condenser, an expansion valve, an evaporator, a compressor, a gas-liquid separator and a refrigerant liquid treatment piece, the condenser, the expansion valve, the evaporator, the gas-liquid separator and the compressor are sequentially connected, and a gas outlet of the compressor is connected with a gas inlet of the condenser; a gas inlet of the gas-liquid separator is connected with a gas outlet of the evaporator, a gas outlet of the gas-liquid separator is connected with a gas inlet of the compressor, the gas-liquid separator is used for separating refrigerant liquid in refrigerant steam, and the refrigerant liquid treatment piece is connected with a liquid outlet of the gas-liquid separator. The refrigerant liquid processing part is used for receiving and processing refrigerant liquid at the liquid outlet of the gas-liquid separator. Through the arrangement of the refrigerant liquid treatment piece, refrigerant steam and refrigerant liquid in a refrigerant gas-liquid mixture are separated from each other, and therefore the refrigerant steam entering the compressor is not prone to carrying liquid on the premise that the superheat degree of a refrigerant is not increased and the utilization rate of the heat exchange area of the evaporator is not increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration equipment, in particular to a gas-liquid separator, a refrigeration system and a control method thereof. BACKGROUND

[0002] The refrigeration system comprises a condenser, an expansion valve, an evaporator and a compressor, the condenser, the expansion valve, the evaporator and the compressor are sequentially connected in sequence, and the gas outlet of the compressor is connected with the gas inlet of the condenser. After the refrigerant liquid absorbs the heat of the cooled object (water or air) in the evaporator, it is vaporized into low-temperature and low-pressure refrigerant vapor and then sucked into the compressor, and then compressed into high-pressure and high-temperature refrigerant vapor and discharged into the condenser. The refrigerant vapor releases heat to the cooled object (water or air) in the condenser, and is condensed into high-pressure refrigerant liquid, and then expanded into low-pressure and low-temperature refrigerant liquid by the expansion valve and then enters the evaporator to absorb heat and vaporize, so as to achieve the purpose of circulating refrigeration. The water or air outside exchanges heat with the liquid refrigerant in the evaporator, so as to achieve the purpose of refrigerating the water or air outside.

[0003] Among them, the refrigerant vapor from the evaporator to the compressor has the problem of liquid carrying. In order to ensure that there is no liquid carrying at the inlet of the compressor, the superheat degree of the refrigerant needs to be increased in the prior art, so that the temperature of the liquid refrigerant when entering the evaporator is increased, and then the liquid refrigerant entering the compressor is as much as possible to be in a vapor state. However, this leads to a decrease in the utilization rate of the heat exchange area of the evaporator, and the efficiency of heat exchange between the liquid refrigerant in the evaporator and the outside air is reduced, which greatly affects the refrigeration capacity or heating capacity. SUMMARY

[0004] The technical scheme adopted by the present application to solve its technical problems is to provide a gas-liquid separator, which comprises a container shell, an air inlet pipe and an air outlet pipe arranged on the container shell, and a liquid outlet pipe arranged at the bottom of the container shell. The air inlet pipe corresponds to the air inlet of the gas-liquid separator, the air outlet pipe corresponds to the air outlet of the gas-liquid separator, the container shell is horizontally arranged, and a plurality of separation blades are arranged in the container shell. The plurality of separation blades are arranged in parallel along the direction of gravity, and the spacing between the plurality of separation blades is 3-8 mm.

[0005] Further, the separation blade is in a wave structure.

[0006] Further, the wave of the separation blade is in a sine wave structure.

[0007] Further, the wave of the separation blade is in a circular structure.

[0008] Based on the technical problems existing in the prior art, the application further provides a refrigeration system comprising the gas-liquid separator as described in the above embodiments, and further comprising a condenser, an expansion valve, an evaporator, a compressor and a refrigerant liquid treatment device, the condenser, the expansion valve, the evaporator, the gas-liquid separator and the compressor are sequentially connected in sequence, the gas outlet of the compressor is connected with the gas inlet of the condenser, the gas inlet of the gas-liquid separator is connected with the gas outlet of the evaporator, the gas outlet of the gas-liquid separator is connected with the gas inlet of the compressor, the gas-liquid separator is used for separating refrigerant liquid in refrigerant vapor, the refrigerant liquid treatment device is connected with the liquid outlet of the gas-liquid separator, and the refrigerant liquid treatment device is used for receiving and treating the refrigerant liquid from the liquid outlet of the gas-liquid separator.

[0009] Further, the refrigerant liquid treatment device is a pump, the liquid outlet of the gas-liquid separator is connected with the pump, the outlet of the pump is connected with the liquid inlet of the evaporator, and the pump is used for conveying the refrigerant liquid separated by the gas-liquid separator into the evaporator.

[0010] Further, the refrigerant liquid treatment device is a heat exchanger, the liquid outlet of the gas-liquid separator is connected with the liquid inlet of the heat exchanger, the gas outlet of the heat exchanger is connected with the gas inlet of the compressor, and the heat exchanger is used for conveying the refrigerant liquid separated by the gas-liquid separator into the compressor after vaporization.

[0011] Further, the liquid inlet of the heat exchanger is provided with a temperature sensor one.

[0012] Further, the gas outlet of the heat exchanger is provided with a temperature sensor two.

[0013] Based on the technical problems existing in the prior art, the application further provides a control method for controlling the refrigeration system, and the method comprises the following steps:

[0014] S1, acquiring a temperature value T1 measured by the temperature sensor one and a temperature value T2 measured by the temperature sensor two;

[0015] S2, calculating the superheat degree of the refrigerant vapor at the gas outlet of the heat exchanger, and the superheat degree is the difference between T2 and T1;

[0016] S3, adjusting the opening degree of the expansion valve according to the size of the superheat degree, and the standard value range of the superheat degree is 5-15℃.

[0017] The application has the beneficial effects that: through the arrangement of the refrigerant liquid treatment device and the gas-liquid separator, the refrigerant vapor and the refrigerant liquid in the refrigerant gas-liquid mixture are separated from each other, so that the refrigerant vapor in the compressor is not easy to carry liquid without improving the superheat degree of the refrigerant and reducing the utilization rate of the heat exchange area of the evaporator. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in conjunction with the accompanying drawings and examples.

[0019] In the drawings: Figure 1 FIG. 1 is a general structural diagram of a gas-liquid separator according to an embodiment of the present application;

[0020] Figure 2 FIG. 2 is a sectional view of a separation blade according to the embodiment of the present application; Figure 1

[0021] Figure 3 FIG. 3 is a sectional view of a separation blade according to another embodiment of the present application;

[0022] Figure 4 FIG. 4 is a general structural diagram of a refrigeration system according to an embodiment of the present application (arrows indicate the flow direction of refrigerant);

[0023] Figure 5 FIG. 5 is a general structural diagram of a refrigeration system according to another embodiment of the present application (arrows indicate the flow direction of refrigerant and heat exchange medium);

[0024] Figure 6 FIG. 6 is a general structural diagram of a refrigeration system according to another embodiment of the present application (arrows indicate the flow direction of refrigerant and heat exchange medium).

[0025] Figure 7 FIG. 7 is a general structural diagram of a refrigeration system according to another embodiment of the present application (arrows indicate the flow direction of refrigerant and heat exchange medium).

[0026] BRIEF DESCRIPTION OF DRAWINGS1. Condenser; 2. Expansion valve; 3. Evaporator; 4. Compressor; 5. Gas-liquid separator; 51. Container housing; 52. Inlet pipe; 53. Outlet pipe; 54. Outlet pipe; 55. Separation blade; 6. Pump; 7. Heat exchanger; 71. Temperature sensor 1; 72. Temperature sensor 2; 73. Heat exchange medium inlet; 74. Heat exchange medium outlet. DETAILED DESCRIPTION

[0027] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clear, the present application will be described in detail below in conjunction with the accompanying drawings. The drawings are simplified schematic diagrams and only schematically illustrate the basic aspects of the present application, and thus only show the aspects related to the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Embodiment 1

[0029] Please refer to Figure 1 and Figure 2The application provides a gas-liquid separator 5, which comprises a container shell 51, an air inlet pipe 52 and an air outlet pipe 53 arranged on the container shell 51, and a liquid outlet pipe 54 arranged at the bottom of the container shell 51, the air inlet pipe 52 is connected to the air inlet of the gas-liquid separator 5, and the air outlet pipe 53 is connected to the air outlet of the gas-liquid separator 5.

[0030] The height direction of the container shell 51 is the gravity direction, the length direction of the container shell 51 is the horizontal direction, the container shell 51 is horizontally arranged, and the air inlet pipe 52 and the air outlet pipe 53 are arranged on the two sides of the container shell 51 in the horizontal direction. Figure 1

[0031] The diameter of the container shell 51 is 2-5 times of the diameter of the air inlet pipe 52, and the diameter of the air outlet pipe 53 is the same as that of the air inlet pipe 52.

[0032] The distance between the plurality of separation blades 55 is 3-8 mm, preferably 5 mm.

[0033] The separation blade 55 is in a wave structure, and the wave height of the separation blade 55 is equal to the distance between the adjacent separation blades 55, the number of the waves on the separation blade 55 is 3-10, and the wave on the separation blade 55 is in a sine wave structure.

[0034] The waves on the separation blade 55 are arranged in parallel in the horizontal direction, and a gap for the refrigerant liquid to pass through is arranged between the separation blade 55 and the inner wall of the container shell 51.

[0035] Embodiment two

[0036] Please refer to Figure 3 ​The difference between the embodiment and the embodiment one is that the wave of the separation blade 55 is a circular structure, and the height of the wave in the embodiment is higher than that in the embodiment one, so that the contact area of the separation blade 55 and the refrigerant liquid in the refrigerant gas-liquid mixture is increased, and the separation efficiency of the gas-liquid separator 5 is improved.

[0037] Embodiment three

[0038] Please refer to Figure 4 Based on the technical problems existing in the prior art, the embodiment of the present application further provides a refrigeration system, which comprises the gas-liquid separator 5 of the embodiment one, and further comprises a condenser 1, an expansion valve 2, an evaporator 3, a compressor 4 and a refrigerant liquid treatment device. The condenser 1, the expansion valve 2, the evaporator 3, the gas-liquid separator 5 and the compressor 4 are sequentially connected in sequence. The gas outlet of the compressor 4 is connected with the gas inlet of the condenser 1. The gas inlet of the gas-liquid separator 5 is connected with the gas outlet of the evaporator 3. The gas outlet of the gas-liquid separator 5 is connected with the gas inlet of the compressor 4. The gas-liquid separator 5 is used for separating the refrigerant liquid in the refrigerant steam. The refrigerant liquid treatment device is connected with the liquid outlet of the gas-liquid separator 5, and is used for receiving and treating the refrigerant liquid from the liquid outlet of the gas-liquid separator 5.

[0039] The working process of the refrigeration system provided by the embodiment of the present application is as follows: After the refrigerant liquid absorbs the heat of the cooled object (water or air) in the evaporator 3 and is vaporized into low-temperature and low-pressure refrigerant steam, the refrigerant steam is sucked into the compressor 4, and is compressed into high-pressure and high-temperature refrigerant steam by the compressor 4, and is then discharged into the condenser 1. The refrigerant steam releases heat to the cooled object (water or air) in the condenser 1, and is condensed into medium-temperature and high-pressure refrigerant liquid, and is then expanded into low-pressure and low-temperature refrigerant liquid by the expansion valve 2, and then enters the evaporator 3 again to be heated and vaporized, so as to achieve the purpose of circulating refrigeration. The water or air outside is heat-exchanged with the liquid refrigerant in the evaporator 3, so as to achieve the purpose of refrigerating the water or air outside.

[0040] Please refer to Figure 4 The refrigerant liquid treatment device is a pump 6. The liquid outlet of the gas-liquid separator 5 is connected with the pump 6. The outlet of the pump 6 is connected with the liquid inlet of the evaporator 3. The pump 6 is used for conveying the refrigerant liquid separated by the gas-liquid separator 5 into the evaporator 3.

[0041] When the refrigerant gas-liquid mixture at the outlet of the evaporator 3 enters the container shell 51 through the inlet pipe 52, the flow area of the refrigerant gas-liquid mixture suddenly expands because the diameter of the container shell 51 is 2-5 times the diameter of the inlet pipe 52, so that the flow rate of the refrigerant gas-liquid mixture rapidly decreases to 0, and because the densities of the gaseous medium and the liquid medium are different, the refrigerant vapor in the refrigerant gas-liquid mixture rises along the gravity direction because of the low density, and enters the compressor 4 through the outlet pipe 53, and the refrigerant liquid in the refrigerant gas-liquid mixture flows downward along the gravity direction from the gap between the separation blades 55 and the container shell 51, and flows into the pump 6 through the outlet pipe 54. The pump 6 delivers the refrigerant liquid to the evaporator 3, and the refrigerant liquid exchanges heat with the water or air outside the evaporator 3 to become refrigerant vapor, and then enters the compressor 4 through the evaporator 3 and the gas-liquid separator 5 in turn, so that the refrigerant vapor entering the compressor 4 is not easy to carry liquid under the premise of not increasing the superheat degree of the refrigerant and reducing the utilization rate of the heat exchange area of the evaporator 3.

[0042] Example Four

[0043] Please refer to Figure 5 The present embodiment provides a refrigeration system, and the difference between the present embodiment and example three is that the refrigerant liquid treatment device is a heat exchanger 7, the liquid outlet of the gas-liquid separator 5 is connected to the liquid inlet of the heat exchanger 7, and the gas outlet of the heat exchanger 7 is connected to the gas inlet of the compressor 4, and the heat exchanger 7 is used to vaporize the refrigerant liquid separated by the gas-liquid separator 5 and then deliver the refrigerant liquid to the compressor 4.

[0044] When the refrigerant gas-liquid mixture at the outlet of the evaporator 3 enters the container shell 51 through the inlet pipe 52, the flow area of the refrigerant gas-liquid mixture suddenly expands because the diameter of the container shell 51 is 2-5 times the diameter of the inlet pipe 52, so that the flow rate of the refrigerant gas-liquid mixture rapidly decreases to 0, and because the densities of the gaseous medium and the liquid medium are different, the refrigerant vapor in the refrigerant gas-liquid mixture rises along the gravity direction because of the low density, and enters the compressor 4 through the outlet pipe 53, and the refrigerant liquid in the refrigerant gas-liquid mixture flows downward along the gravity direction from the gap between the separation blades 55 and the container shell 51, and flows into the pump 6 through the outlet pipe 54. The pump 6 delivers the refrigerant liquid to the evaporator 3, and the refrigerant liquid exchanges heat with the water or air outside the evaporator 3 to become refrigerant vapor, and then enters the compressor 4 through the evaporator 3 and the gas-liquid separator 5 in turn, so that the refrigerant vapor entering the compressor 4 is not easy to carry liquid under the premise of not increasing the superheat degree of the refrigerant and reducing the utilization rate of the heat exchange area of the evaporator 3.

[0045] The liquid inlet of the heat exchanger 7 is provided with a temperature sensor one 71, and the gas outlet of the heat exchanger 7 is provided with a temperature sensor two 72.

[0046] The heat exchanger 7 is further provided with a heat exchange medium inlet 73 and a heat exchange medium outlet 74, the heat exchange medium enters the heat exchanger 7 from the heat exchange medium inlet 73 and exchanges heat with the refrigerant liquid, and then flows out from the heat exchange medium outlet 74. Specifically, the heat exchange medium in the embodiment includes but is not limited to water, refrigerant liquid or air, and the source of the heat exchange medium can be any component in the refrigeration system or an external source.

[0047] Embodiment five

[0048] Please refer to Figure 6 The embodiment provides a refrigeration system, and the difference between the embodiment and embodiment three is that the wave of the separation blade 55 is a circular structure, and the height of the wave in the embodiment is higher than that in embodiment three, so that the contact area of the separation blade 55 and the refrigerant liquid in the refrigerant gas-liquid mixture is increased, and the separation efficiency of the gas-liquid separator 5 is improved.

[0049] Embodiment six

[0050] Please refer to Figure 7 The embodiment provides a refrigeration system, and the difference between the embodiment and embodiment three is that the wave of the separation blade 55 is a circular structure, and the height of the wave in the embodiment is higher than that in embodiment three, so that the contact area of the separation blade 55 and the refrigerant liquid in the refrigerant gas-liquid mixture is increased, and the separation efficiency of the gas-liquid separator 5 is improved.

[0051] Based on the technical problems existing in the prior art, the embodiment of the present application further provides a control method for controlling the refrigeration system described in embodiments four and six, and the method comprises the following steps:

[0052] S1, obtaining the temperature value T1 measured by the temperature sensor one 71 and the temperature value T2 measured by the temperature sensor two 72;

[0053] S2, calculating the superheat degree of the refrigerant vapor at the gas outlet of the heat exchanger 7, and the superheat degree is the difference between T2 and T1;

[0054] S3, adjusting the opening degree of the expansion valve 2 according to the size of the superheat degree, and the standard value range of the superheat degree is 5-15℃.

[0055] Specifically, if the superheat degree is greater than the standard value range, the opening degree of the expansion valve 2 is increased, and if the superheat degree is less than the standard value range, the opening degree of the expansion valve 2 is reduced. The opening degree of the expansion valve 2 is controlled by the superheat degree of the refrigerant in the heat exchanger 7, so as to reduce the case that the heat exchange area in the heat exchanger 7 is not fully utilized.

Claims

1. A gas-liquid separator, characterized in that: The device includes a container shell, an air inlet pipe and an air outlet pipe disposed on the container shell, and a liquid outlet pipe disposed at the bottom of the container shell. The air inlet pipe is connected to the air inlet of the gas-liquid separator, and the air outlet pipe is connected to the air outlet of the gas-liquid separator. The container shell is horizontally arranged, and multiple separation blades are provided inside the container shell. The multiple separation blades are arranged side by side along the direction of gravity, and the distance between the multiple separation blades is 3mm-8mm.

2. The gas-liquid separator according to claim 1, characterized in that: The separating blades have a wave-like structure.

3. The gas-liquid separator according to claim 2, characterized in that: The waves of the separated blades have a sinusoidal structure.

4. The gas-liquid separator according to claim 2, characterized in that: The wave-like structure of the separating blade is circular.

5. A refrigeration system, characterized in that: The device includes a gas-liquid separator as described in any one of claims 1-4, further comprising a condenser, an expansion valve, an evaporator, a compressor, and a refrigerant liquid handling unit. The condenser, expansion valve, evaporator, gas-liquid separator, and compressor are connected sequentially. The outlet of the compressor is connected to the inlet of the condenser, the inlet of the gas-liquid separator is connected to the outlet of the evaporator, and the outlet of the gas-liquid separator is connected to the inlet of the compressor. The gas-liquid separator is used to separate refrigerant liquid from refrigerant vapor. The refrigerant liquid handling unit is connected to the outlet of the gas-liquid separator and is used to receive and process the refrigerant liquid at the outlet of the gas-liquid separator.

6. The refrigeration system according to claim 5, characterized in that: The refrigerant liquid handling component is a pump. The outlet of the gas-liquid separator is connected to the pump, and the outlet of the pump is connected to the inlet of the evaporator. The pump is used to transport the refrigerant liquid separated by the gas-liquid separator to the evaporator.

7. The refrigeration system according to claim 5, characterized in that: The refrigerant liquid handling component is a heat exchanger. The liquid outlet of the gas-liquid separator is connected to the liquid inlet of the heat exchanger, and the gas outlet of the heat exchanger is connected to the gas inlet of the compressor. The heat exchanger is used to vaporize the refrigerant liquid separated by the gas-liquid separator and then transport it to the compressor.

8. The refrigeration system according to claim 7, characterized in that: The heat exchanger is equipped with a temperature sensor at its liquid inlet.

9. The refrigeration system according to claim 8, characterized in that: The heat exchanger is equipped with a temperature sensor 2 at its outlet.

10. A control method for a refrigeration system, characterized in that, The method for controlling the refrigeration system as described in any one of claims 7-9 includes: S1, acquire the temperature value T1 measured by temperature sensor one and the temperature value T2 measured by temperature sensor two; S2 calculates the superheat of the refrigerant vapor at the heat exchanger outlet, which is the difference between T2 and T1. S3, adjust the opening of the expansion valve according to the degree of superheat, the standard value range of superheat is 5℃-15℃.

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