Environmental simulation test box pipeline system capable of preventing evaporator from frosting

Abstract

The utility model provides an environmental simulation test box pipeline system capable of preventing an evaporator from frosting. Comprising a compressor, an oil separator, a condenser, a liquid storage tank, a drying filter, a first electromagnetic valve, a thermal bypass valve, a second electromagnetic valve, a thermal expansion valve, a third electromagnetic valve, a manual expansion valve, an evaporator, an evaporation pressure regulating valve, a bypass valve, a main air return pipe, an air return pressure sensor and an air return temperature sensor. And the evaporation pressure regulating valve is provided with a pressure sensor and returns a pressure signal in a pipeline at the other end of the evaporation channel of the evaporator to the controller. According to the utility model, the evaporator can work for a long time, frequent defrosting is not needed, and long-time continuous refrigeration work of the environment simulation test box at a set temperature point (such as 5 DEG C) is ensured.

Description

Technical Field

[0001] This utility model relates to an environmental simulation test chamber, and more particularly to a piping system for an environmental simulation test chamber that prevents evaporator frost formation. Background Technology

[0002] Environmental simulation test chambers have a wide range of applications. In university laboratories, they can be used to simulate temperature and humidity changes in the natural environment. In enterprises, they are often used in the research and development stage to test the reliability of products under extreme climatic conditions and to conduct aging tests on products.

[0003] The evaporator in the environmental simulation test chamber sometimes frosts up, which affects the continuous use time of the environmental simulation test chamber, and defrosting has to be performed frequently in actual use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a piping system for an environmental simulation test chamber that prevents evaporator frosting. This system avoids evaporator frosting, allowing the environmental simulation test chamber to continuously cool at a set temperature for an extended period. To achieve the above technical objectives, the technical solution adopted in this utility model embodiment is as follows:

[0005] This utility model provides a pipeline system for an environmental simulation test chamber that avoids evaporator frost formation, including a compressor, oil separator, condenser, liquid receiver, dryer filter, first solenoid valve, thermal bypass valve, second solenoid valve, thermal expansion valve, third solenoid valve, manual expansion valve, evaporator, evaporation pressure regulating valve, bypass valve, main return gas pipe, return gas pressure sensor, and return gas temperature sensor.

[0006] The compressor outlet is connected to one end of an oil separator via a pipeline, and the other end of the oil separator is connected to one end of a condenser and one end of a first solenoid valve via a pipeline. The oil return port of the oil separator is connected to the compressor via a pipeline. The other end of the first solenoid valve is connected to one end of a thermal bypass valve via a pipeline, and the other end of the thermal bypass valve is connected to the main return gas pipe via a pipeline. The other end of the condenser is connected to the inlet of a liquid receiver via a pipeline, and the outlet of the liquid receiver is connected to one end of a dryer filter via a pipeline. The other end of the dryer filter is connected to one end of a second solenoid valve and one end of a third solenoid valve via a pipeline. The other end of the second solenoid valve is connected to one end of a thermal expansion valve via a pipeline, and the other end of the thermal expansion valve is connected to the main return gas pipe via a pipeline. The other end of the third solenoid valve is connected to one end of a manual expansion valve via a pipeline, and the other end of the manual expansion valve is connected to one end of an evaporator evaporation channel via a pipeline. The other end of the evaporator evaporation channel is connected to one end of an evaporation pressure regulating valve and one end of a bypass valve via pipelines. The other ends of the evaporation pressure regulating valve and the bypass valve are connected to the main return gas pipe via pipelines. The main return gas pipe is connected to the compressor inlet.

[0007] A return gas pressure sensor and a return gas temperature sensor are installed on the section of the main return gas pipe near the compressor; the return gas pressure sensor and the return gas temperature sensor are respectively connected to a thermal expansion valve; the thermal expansion valve is controlled by the return gas pressure sensor and the return gas temperature sensor.

[0008] The evaporation pressure regulating valve is equipped with a pressure sensor and transmits the pressure signal from the pipeline at the other end of the evaporator evaporation channel back to the controller.

[0009] Furthermore, the oil return port of the oil separator is equipped with a shock-absorbing ring on the pipeline connecting to the compressor.

[0010] Furthermore, a high-pressure sensor and a high-pressure gauge are connected to the pipeline between the compressor outlet and the oil separator via a tee.

[0011] Furthermore, a low-pressure gauge is connected to the compressor inlet pipe via a tee.

[0012] Furthermore, a sight glass is provided on the pipeline at the other end of the drying filter.

[0013] The beneficial effects of the technical solution provided by this utility model embodiment are: this utility model can control the refrigerant pressure at the outlet of the evaporator and keep it above the set pressure value, so that the working temperature of the evaporator can be kept above 0°C, allowing the evaporator to work for a long time without frequent defrosting, and ensuring that the environmental simulation test chamber can continuously cool for a long time at the set temperature point (e.g., 5°C). Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the pipeline system structure in an embodiment of the present utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0016] like Figure 1 As shown in the figure, the pipeline system of the environmental simulation test chamber for avoiding evaporator frost proposed in this utility model embodiment includes a compressor 1, an oil separator 2, a condenser 3, a liquid storage tank 4, a dryer filter 5, a first solenoid valve 6, a thermal bypass valve 7, a second solenoid valve 8, a thermal expansion valve 9, a third solenoid valve 10, a manual expansion valve 11, an evaporator 12, an evaporation pressure regulating valve 13, a bypass valve 14, a main return gas pipe 15, a return gas pressure sensor 16, and a return gas temperature sensor 17.

[0017] The outlet of compressor 1 is connected to one end of oil separator 2 via a pipeline, and the other end of oil separator 2 is connected to one end of condenser 3 and one end of first solenoid valve 6 via a pipeline; the oil return port of oil separator 2 is connected to compressor 1 via a pipeline; the other end of first solenoid valve 6 is connected to one end of thermal bypass valve 7 via a pipeline, and the other end of thermal bypass valve 7 is connected to main return gas pipe 15 via a pipeline; the other end of condenser 3 is connected to the inlet of liquid storage tank 4 via a pipeline, and the outlet of liquid storage tank 4 is connected to one end of dryer filter 5 via a pipeline; the other end of dryer filter 5 is connected to one end of second solenoid valve 8 and one end of third solenoid valve 10 via a pipeline. One end of the second solenoid valve 8 is connected to one end of the thermal expansion valve 9 via a pipeline, and the other end of the thermal expansion valve 9 is connected to the main return gas pipe 15 via a pipeline; the other end of the third solenoid valve 10 is connected to one end of the manual expansion valve 11 via a pipeline, and the other end of the manual expansion valve 11 is connected to one end of the evaporation channel of the evaporator 12 via a pipeline, and the other end of the evaporation channel of the evaporator 12 is connected to one end of the evaporation pressure regulating valve 13 and one end of the bypass valve 14 via pipelines, and the other ends of the evaporation pressure regulating valve 13 and the bypass valve 14 are respectively connected to the main return gas pipe 15 via pipelines; the main return gas pipe 15 is connected to the inlet of the compressor 1;

[0018] A return gas pressure sensor 16 and a return gas temperature sensor 17 are provided on the section of the main return gas pipe 15 near the compressor 1; the return gas pressure sensor 16 and the return gas temperature sensor 17 are respectively connected to the thermal expansion valve 9; the thermal expansion valve 9 is controlled by the return gas pressure sensor 16 and the return gas temperature sensor 17.

[0019] The evaporation pressure regulating valve 13 is equipped with a pressure sensor and transmits the pressure signal from the pipeline at the other end of the evaporation channel of the evaporator 12 back to the controller.

[0020] The working principle of this utility model is as follows: Compressor 1 pressurizes the refrigerant to form a high-temperature, high-pressure gaseous refrigerant. Lubricating oil is separated by oil separator 2 and returned to the compressor. The high-temperature, high-pressure gaseous refrigerant then enters condenser 3 for condensation, forming a normal-temperature, high-pressure liquid refrigerant. When the ambient temperature is high, the refrigerant exiting condenser 3 will be a gas-liquid mixture. The liquid storage tank 4 can increase the liquid saturation of the refrigerant. The normal-temperature, high-pressure liquid refrigerant is dried and impurities are filtered out by a dryer filter 5. The normal-temperature, high-pressure liquid refrigerant passes through a third solenoid valve 10, and then through a manual expansion valve 11 for manual expansion. The expansion valve 11 can reduce the refrigerant pressure and adjust the gas-liquid mixing ratio of the refrigerant entering the evaporator 12 to improve the evaporation efficiency and heat exchange effect of the refrigerant in the evaporator 12. Through the pressure signal fed back by the pressure sensor on the evaporation pressure regulating valve 13, the evaporation pressure regulating valve 13 can be manually controlled to keep the pressure in the pipeline at the other end of the evaporation channel of the evaporator 12 above the set pressure value, such as above 5 kg, so that the operating temperature of the evaporator 12 can be kept above 0℃, avoiding frost formation on the evaporator 12. This allows the evaporator 12 to work for a long time without frequent defrosting.

[0021] When refrigeration below 0°C is required, the bypass valve 14 can be opened; at this time, the evaporator 12 needs to be defrosted after working for a period of time, similar to existing technology.

[0022] The gaseous refrigerant (i.e., return gas) coming out of the evaporator 12 passes through the evaporation pressure regulating valve 13 and then returns to the compressor 1 through the main return gas pipe 15. The thermostatic expansion valve 9 is controlled by the return gas pressure sensor 16 and the return gas temperature sensor 17. When the return gas temperature is too high, the thermostatic expansion valve 9 will automatically increase its opening, allowing some room temperature high-pressure liquid refrigerant to enter the main return gas pipe 15, evaporate and absorb heat, thus lowering the return gas temperature. When the return gas pressure is too high, the thermostatic expansion valve 9 will automatically decrease its opening.

[0023] When the ambient temperature is too low, the first solenoid valve 6 can be opened, and a small amount of high-temperature and high-pressure gaseous refrigerant enters the main return pipe 15 through the thermal bypass valve 7 to eliminate the liquid refrigerant in the main return pipe 15 and prevent the compressor 1 from experiencing liquid slugging.

[0024] More preferably, the oil return port of the oil separator 2 is provided with a shock-absorbing ring 18 on the pipeline connecting to the compressor 1; the shock-absorbing ring 18 can reduce the impact of the vibration of the compressor 1 on the oil separator 2.

[0025] More preferably, a high-pressure sensor 19 and a high-pressure gauge 20 are connected to the pipeline between the outlet of the compressor 1 and the oil separator 2 via a tee; the high-pressure sensor 19 is connected to the controller; the high-pressure sensor 19 and the high-pressure gauge 20 can monitor the refrigerant pressure in the outlet pipeline of the compressor 1.

[0026] More preferably, a low-pressure gauge 21 is connected to the inlet pipe of the compressor 1 via a tee; the low-pressure gauge 21 can monitor the refrigerant pressure in the inlet pipe of the compressor 1.

[0027] More preferably, a sight glass 22 is provided on the pipe at the other end of the dryer filter 5 to observe the liquid saturation of the refrigerant.

[0028] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A piping system for an environmental simulation test chamber that prevents evaporator frost formation, characterized in that, Includes compressor (1), oil separator (2), condenser (3), liquid receiver (4), dryer filter (5), first solenoid valve (6), thermal bypass valve (7), second solenoid valve (8), thermal expansion valve (9), third solenoid valve (10), manual expansion valve (11), evaporator (12), evaporation pressure regulating valve (13), bypass valve (14), main return gas pipe (15), return gas pressure sensor (16), and return gas temperature sensor (17); The outlet of the compressor (1) is connected to one end of the oil separator (2) via a pipeline, and the other end of the oil separator (2) is connected to one end of the condenser (3) and one end of the first solenoid valve (6) via a pipeline; the oil return port of the oil separator (2) is connected to the compressor (1) via a pipeline; the other end of the first solenoid valve (6) is connected to one end of the thermal bypass valve (7) via a pipeline, and the other end of the thermal bypass valve (7) is connected to the main return gas pipe (15) via a pipeline; the other end of the condenser (3) is connected to the inlet of the liquid storage tank (4) via a pipeline, and the outlet of the liquid storage tank (4) is connected to one end of the dryer filter (5) via a pipeline; the other end of the dryer filter (5) is connected to one end of the second solenoid valve (8) and the third solenoid valve (10) via a pipeline. One end of the second solenoid valve (8) is connected to one end of the thermal expansion valve (9) through a pipeline, and the other end of the thermal expansion valve (9) is connected to the main return gas pipe (15) through a pipeline; the other end of the third solenoid valve (10) is connected to one end of the manual expansion valve (11) through a pipeline, and the other end of the manual expansion valve (11) is connected to one end of the evaporation channel of the evaporator (12) through a pipeline, and the other end of the evaporation channel of the evaporator (12) is connected to one end of the evaporation pressure regulating valve (13) and one end of the bypass valve (14) through pipelines respectively, and the other ends of the evaporation pressure regulating valve (13) and the bypass valve (14) are connected to the main return gas pipe (15) through pipelines respectively; the main return gas pipe (15) is connected to the inlet of the compressor (1); A return gas pressure sensor (16) and a return gas temperature sensor (17) are installed on the section of the main return gas pipe (15) near the compressor (1); the return gas pressure sensor (16) and the return gas temperature sensor (17) are respectively connected to the thermostatic expansion valve (9); the thermostatic expansion valve (9) is controlled by the return gas pressure sensor (16) and the return gas temperature sensor (17); The evaporation pressure regulating valve (13) is equipped with a pressure sensor and transmits the pressure signal from the pipeline at the other end of the evaporation channel of the evaporator (12) back to the controller.

2. The piping system for the environmental simulation test chamber that avoids evaporator frosting as described in claim 1, characterized in that, The oil return port of the oil separator (2) is connected to the compressor (1) via a shock-absorbing ring (18).

3. The environmental simulation test chamber piping system for preventing evaporator frosting as described in claim 1, characterized in that, A high-pressure sensor (19) and a high-pressure meter (20) are connected to the pipeline between the outlet of the compressor (1) and the oil separator (2) via a tee.

4. The environmental simulation test chamber piping system for preventing evaporator frosting as described in claim 1, characterized in that, The compressor (1) has a low pressure gauge (21) connected to the inlet pipe via a tee.

5. The environmental simulation test chamber piping system for preventing evaporator frosting as described in claim 1, characterized in that, A sight glass (22) is provided on the pipeline at the other end of the dryer filter (5).

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