Refrigerating system capable of automatically adjusting condensing pressure

Abstract

The utility model provides a refrigerating system capable of automatically adjusting condensing pressure, and particularly relates to the technical field of refrigerating equipment. The refrigerating system comprises a compressor, a condenser, a gas-liquid separator, a pressure limiting valve, a gas return pipe assembly and an evaporator. The air return pipe assembly comprises a capillary pipe and an air return pipe; the condenser is arranged between the compressor and the gas-liquid separator; the gas-liquid separator is connected with one end of the capillary tube through the filter; the other end of the capillary tube is connected with the evaporator; the evaporator is connected with the compressor through an air return pipe; the inlet end of the pressure limiting valve is connected with the gas-liquid separator, and the outlet end of the pressure limiting valve is connected with the compressor. The refrigerating system is simple in structure, when the pressure of the condenser is higher than the set pressure of the pressure-limiting valve, the pressure-limiting valve is opened, and the gas-liquid separator enables a gaseous refrigerant to enter the air suction end of the compressor through the pressure-limiting valve, so that the pressure of the condenser is reduced, and the reliability of the refrigerating system is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a refrigeration system capable of automatically adjusting condensation pressure. Background Art

[0002] At present, for some refrigeration systems using fixed-frequency compressors, when the compressor is started for the first time, the heat load of the refrigeration system is large, and the heat dissipation efficiency of the condenser cannot meet the high-load requirements, resulting in the condensation pressure in the condenser becoming higher and higher. When the condensation pressure is higher than the maximum exhaust pressure of the compressor, the compressor will trip and the reliability of the refrigeration system will decrease.

[0003] The problem of excessive compressor exhaust pressure can be solved by starting the variable frequency compressor at a low frequency, while for fixed frequency compressors, the problem can be alleviated by increasing the size of the condenser and increasing the internal volume of the condenser. However, the existing air-cooled condensers have high efficiency, small size and small internal volume, which results in the refrigerant not being condensed in time when the heat load is large, resulting in excessive condensation pressure under some operating conditions. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the prior art and solve the problem that when the refrigeration system is under high load, the condenser pressure is too high and the compressor may trip. The utility model provides a refrigeration system that can automatically adjust the condensing pressure. The specific technical solution is as follows:

[0005] A refrigeration system capable of automatically adjusting condensing pressure comprises a compressor, a condenser, a gas-liquid separator, a pressure limiting valve, a return air pipe assembly and an evaporator; the return air pipe assembly comprises a capillary tube and a return air pipe; the condenser is arranged between the compressor and the gas-liquid separator; the gas-liquid separator is connected to one end of the capillary tube through a filter; the other end of the capillary tube is connected to the evaporator; the evaporator is connected to the compressor through the return air pipe; the inlet end of the pressure limiting valve is connected to the gas-liquid separator, and the outlet end of the pressure limiting valve is connected to the compressor.

[0006] Preferably, the air outlet of the compressor is connected to the inlet of the condenser.

[0007] Preferably, the outlet of the condenser is connected to the gas inlet end of the gas-liquid separator.

[0008] Also preferably, the gas outlet end of the gas-liquid separator is connected to the inlet end of the pressure limiting valve; and the outlet end of the pressure limiting valve is connected to the suction end of the compressor.

[0009] Also preferably, the liquid outlet end of the gas-liquid separator is connected to the inlet of the capillary tube through a filter; and the outlet of the capillary tube is connected to the inlet of the evaporator.

[0010] Further preferably, the outlet of the evaporator is connected to the suction end of the compressor through an air return pipe.

[0011] Still further preferably, the pressure of the condenser is the same as the pressure of the gas-liquid separator.

[0012] More preferably, when the pressure of the condenser is higher than 2Mpa, the pressure limiting valve connected to the gas outlet end of the gas-liquid separator is opened; when the pressure of the condenser is lower than 2Mpa, the pressure limiting valve connected to the gas outlet end of the gas-liquid separator is closed.

[0013] The beneficial effects of the utility model are:

[0014] The utility model has a simple structure. When the condenser pressure is higher than the set pressure of the pressure limiting valve, the pressure limiting valve opens, the gas-liquid separator allows the gaseous part of the refrigerant to enter the suction end of the compressor through the pressure limiting valve, and the liquid refrigerant passes through the filter and the evaporator to provide cooling capacity for the refrigeration system, thereby reducing the pressure of the condenser and effectively improving the reliability of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting the specification of this application are used to provide further understanding of this application and do not constitute improper limitations on this application.

[0016] Figure 1 This is a working principle diagram of the utility model;

[0017] In the figure, 1-compressor; 2-condenser; 3-gas-liquid separator; 4-pressure limiting valve; 5-filter; 6-return air pipe assembly; 7-evaporator. DETAILED DESCRIPTION

[0018] The specific implementation of a refrigeration system capable of automatically adjusting the condensing pressure provided by the utility model is further described in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, a refrigeration system capable of automatically adjusting the condensing pressure comprises a compressor 1, a condenser 2, a gas-liquid separator 3, a pressure limiting valve 4, a return air pipe assembly 6 and an evaporator 7.

[0020] The condenser 2 is arranged between the compressor 1 and the gas-liquid separator 3; a filter 5 is arranged between the gas-liquid separator 3 and the return air pipe assembly 6. The return air pipe assembly 6 includes a capillary tube and a return air pipe; the evaporator 7 is connected to the gas-liquid separator 3 through the capillary tube of the return air pipe assembly 6; the evaporator 7 is connected to the compressor 1 through the return air pipe of the return air pipe assembly 6; the inlet end of the pressure limiting valve 4 is connected to the gas-liquid separator 3, and the outlet end of the pressure limiting valve 4 is connected to the compressor 1.

[0021] Specifically, the gas outlet of the compressor 1 is connected to the inlet of the condenser 2; the outlet of the condenser 2 is connected to the gas inlet of the gas-liquid separator 3; the gas outlet of the gas-liquid separator 3 is connected to the inlet of the pressure limiting valve 4; the outlet of the pressure limiting valve 4 is connected to the suction end of the compressor 1. The liquid outlet of the gas-liquid separator 3 is connected to the inlet of the capillary tube in the return air pipe assembly 6 through the filter 5; the outlet of the capillary tube is connected to the inlet of the evaporator 7; the outlet of the evaporator 7 is connected to the suction end of the compressor 1 through the return air pipe in the return air pipe assembly 6.

[0022] It is worth noting that the refrigerant is in both liquid and gaseous forms when it comes out of the outlet of the condenser 2, and the outlet of the condenser 2 is connected to the gas inlet end of the gas-liquid separator 3. Therefore, the pressure of the condenser 2 is the same as the pressure in the gas-liquid separator 3.

[0023] During use, when the compressor 1 is started for the first time, the heat load of the refrigeration system is high and the exhaust pressure of the compressor 1 is high. When the pressure of the condenser 2 is higher than 2Mpa, the pressure limiting valve 4 connected to the gas outlet end of the gas-liquid separator 3 is opened, and the gaseous part of the refrigerant in the gas-liquid separator 3 enters the pressure limiting valve 4, and then enters the suction end of the compressor 1, ensuring that the refrigerant in the pressure limiting circuit is all in a gaseous state, which can effectively avoid the liquid hammer phenomenon of the compressor 1; the liquid refrigerant in the gas-liquid separator 3 provides cooling for the refrigeration system through the filter 5 and the evaporator 7, thereby having the effect of relieving pressure on the condenser 2; when the refrigeration system is running stably, the pressure of the condenser 2 is lower than 2Mpa, and the pressure limiting valve 4 connected to the gas outlet end of the gas-liquid separator 3 is closed, and no pressure relief is required. At this time, the refrigerant in the gas-liquid separator 3 all passes through the filter 5 and the evaporator 7 to provide cooling for the refrigeration system.

[0024] The utility model has a simple structure and strong practicability; it effectively controls the pressure of the condenser and improves the reliability of the refrigeration system.

[0025] In the present utility model, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or components of the present utility model. They do not specifically refer to the parts or components of the present utility model and cannot be understood as limitations on the present utility model. Terms such as "connected" and "connected" should be understood in a broad sense, indicating that they can be fixedly connected, integrally connected, or detachably connected; they can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.

[0026] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A refrigeration system capable of automatically adjusting condensing pressure, characterized in that: It includes a compressor, a condenser, a gas-liquid separator, a pressure limiting valve, a return air pipe assembly and an evaporator; The air return pipe assembly comprises a capillary tube and an air return pipe; The condenser is arranged between the compressor and the gas-liquid separator; The gas-liquid separator is connected to one end of the capillary tube through a filter; the other end of the capillary tube is connected to the evaporator; the evaporator is connected to the compressor through a return air pipe; The inlet end of the pressure limiting valve is connected to the gas-liquid separator, and the outlet end of the pressure limiting valve is connected to the compressor.

2. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 1, characterized in that: The air outlet of the compressor is connected to the inlet of the condenser.

3. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 2, characterized in that: The outlet of the condenser is connected to the gas inlet end of the gas-liquid separator.

4. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 3, characterized in that: The gas outlet end of the gas-liquid separator is connected to the inlet end of the pressure limiting valve; and the outlet end of the pressure limiting valve is connected to the suction end of the compressor.

5. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 4, characterized in that: The liquid outlet end of the gas-liquid separator is connected to the inlet of the capillary tube through a filter; the outlet of the capillary tube is connected to the inlet of the evaporator.

6. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 5, characterized in that: The outlet of the evaporator is connected to the suction end of the compressor through a return air pipe.

7. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 1, characterized in that: The pressure of the condenser is the same as the pressure of the gas-liquid separator.

8. The refrigeration system capable of automatically adjusting the condensing pressure according to claim 7, characterized in that: When the pressure of the condenser is higher than 2Mpa, the pressure limiting valve connected to the gas outlet of the gas-liquid separator opens; When the pressure of the condenser is lower than 2Mpa, the pressure limiting valve connected to the gas outlet end of the gas-liquid separator is closed.

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