A new refrigeration device and method for stability test chamber

Abstract

This invention discloses a novel refrigeration device and method for a stability test chamber, relating to the field of refrigeration technology. The refrigeration device includes a condenser, a compressor, an evaporator, a first expansion valve, and a second expansion valve. The condenser is located at the bottom of the test chamber, and the evaporator is located in the working chamber of the test chamber. The inlet end of the compressor is connected to the evaporator. Compared with current refrigeration devices, this invention uses a first expansion valve instead of a capillary tube as a throttling device between the condenser and the evaporator. At the same time, a second expansion valve is provided between the inlet end of the compressor and the outlet end of the condenser. Through the cooperation of the low-pressure controller and the second expansion valve, the compressor can be prevented from operating at very low suction pressure, which would cause compressor damage, and the compressor can be prevented from being damaged by being exposed to excessively high suction temperature for a long time. This allows the test chamber to have a faster dynamic response under a wide range of operating conditions and drastic load changes.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, specifically a novel refrigeration device and method for a stability test chamber. Background Technology

[0002] In modern scientific research and industrial production, stability test chambers are widely used for performance testing of products such as pharmaceuticals and electronic components. By simulating different ambient temperatures, they test the stability and reliability of products under specific conditions. The refrigeration device, as the core component of the stability test chamber, directly affects the working effect and testing accuracy of the test chamber.

[0003] Most existing stability test chamber refrigeration units use capillary tubes as throttling devices. This design has many limitations. On the one hand, the throttling characteristics of capillary tubes are fixed, making it difficult to adapt to the needs of the test chamber under a wide range of operating conditions and drastic load changes, resulting in slow dynamic response and low energy efficiency of the refrigeration system. On the other hand, traditional refrigeration units lack effective compressor protection mechanisms. When the compressor is under conditions of excessively low suction pressure or excessively high suction temperature, it is very easy to damage the compressor, affecting the normal operation and service life of the equipment. In addition, in terms of maintenance of refrigeration units, it is often necessary to release the refrigerant first. This not only wastes expensive refrigerant and increases maintenance costs, but also poses safety hazards for new flammable refrigerants. Finally, in terms of maintenance of evaporators and dryer filters, existing refrigeration units usually require shutdown for manual cleaning of the evaporator and dryer filter. This is not only labor-intensive, but also causes the test chamber to shut down, affecting the normal operation of the test chamber and making it difficult to meet the needs of efficient operation in actual use. Summary of the Invention

[0004] The purpose of this invention is to provide a novel refrigeration device and method for a stability test chamber, in order to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel refrigeration device for a stability test chamber, comprising a condenser, a compressor, an evaporator, a first expansion valve, and a second expansion valve. The condenser is disposed at the bottom of the test chamber, and the evaporator is disposed within the working chamber of the test chamber. The inlet end of the compressor is connected to the evaporator, and the outlet end of the compressor is connected to the condenser. The outlet end of the first expansion valve is connected to the evaporator, and the inlet end of the first expansion valve is connected to the condenser. The second expansion valve is disposed between the inlet end of the compressor and the outlet end of the condenser. A temperature sensor disposed within the test chamber detects the temperature inside the chamber, i.e., the working chamber. When the PLC control system within the test chamber detects that the temperature inside the working chamber is higher than the set temperature, the compressor starts operating. The functions implemented by the sensors and PLC control system are conventional techniques in this field (the specific structure and implementation methods are not described). The compressor draws away the low-temperature, low-pressure refrigerant vapor from the evaporator and compresses it into a high-temperature, high-pressure gas. Finally, it is delivered to the condenser at the bottom of the test chamber and condenses into a liquid. After being throttled by the first expansion valve, the refrigerant with reduced pressure and temperature enters the evaporator to vaporize, absorbing heat from the test chamber's working chamber. The vaporized refrigerant exits the evaporator and then enters the compressor through a connecting pipe, thus completing a refrigeration cycle. In addition, to ensure the refrigeration effect, the centrifugal fan in the test chamber must also operate simultaneously while the compressor is running, so that the air in the test chamber's working chamber flows over the outer surface of the evaporator, thus cooling the air in the working chamber. This cycle is repeated continuously to achieve the purpose of refrigeration and lowering the temperature of the test chamber's working chamber.

[0006] Compared to current refrigeration devices, this invention adds a second expansion valve and a pressure sensor at the compressor inlet. When the pressure sensor at the compressor inlet detects that the suction pressure is lower than the set lower limit, the PLC control system controls the second expansion valve to open, allowing some high-pressure refrigerant to mix with the low-temperature, low-pressure gaseous refrigerant from the evaporator and enter the compressor inlet, thereby increasing the compressor's suction pressure and preventing damage due to prolonged low suction pressure. When the pressure sensor at the compressor inlet detects that the suction pressure is higher than the set upper limit, the PLC control system controls the opening of the first expansion valve to decrease, thus increasing the pressure... The compressor's suction temperature is reduced to prevent damage caused by prolonged exposure to excessively high suction temperatures. When the set temperature inside the test chamber is low, the actual temperature of the chamber approaches the set temperature through the cooling system. With a lower load, the evaporator is prone to icing, causing a rapid and gradual decrease in cooling capacity. At this point, the PLC control system detects that the evaporator surface temperature is below the set value and increases the opening of the first expansion valve, thereby raising the evaporation temperature. Finally, the invention can also use the second expansion valve to reduce the condensing pressure and temperature under high-temperature cooling conditions by sacrificing some cooling capacity, preventing damage to the compressor due to excessively high exhaust temperatures.

[0007] Furthermore, the refrigeration device also includes a low-pressure controller, a first solenoid valve, a second solenoid valve, and a dryer filter. The low-pressure controller and the first solenoid valve are both located at the inlet end of the compressor, the dryer filter is located between the condenser and the first expansion valve, and the second solenoid valve is located at the outlet end of the dryer filter.

[0008] This invention controls the opening of the second expansion valve through a low-pressure controller. This prevents damage to the compressor due to excessively low or high suction pressure, and also prevents continued operation of the product in the event of a refrigeration system leak, thus protecting the compressor. The inclusion of a first and second solenoid valve effectively improves repair speed and reduces costs. Specifically, when refrigeration and control components malfunction and require replacement or repair, the refrigerant can be collected on the non-faulty side for repair or replacement. Repair personnel do not need to release or recharge the refrigerant. This solves the problem of the inconvenience of mailing or carrying new flammable refrigerants and reduces waiting time for purchasing refrigerant, thus facilitating repairs. The specific operating steps are as follows:

[0009] If the faulty refrigeration and control components are identified as the evaporator or the first expansion valve, the PLC control system first closes the first solenoid valve. When the low-pressure controller detects that the pressure is close, it transmits a signal to the PLC control system, which immediately closes the second solenoid valve. This collects the refrigerant in the non-faulty side of the refrigeration system. After the faulty refrigeration and control components are repaired or replaced, the PLC control system opens the first and second solenoid valves, and the refrigeration system returns to normal operation.

[0010] Similarly, if the faulty refrigeration and control components are identified as the condenser, compressor, or dryer filter, the PLC control system first closes the second solenoid valve. When the low-pressure controller detects that the pressure is close, it sends a signal to the PLC control system, which then closes the first solenoid valve, collecting the refrigerant on the non-faulty side of the refrigeration system. After the faulty refrigeration and control components are repaired or replaced, the PLC control system opens the first and second solenoid valves, and the refrigeration system returns to normal operation.

[0011] Furthermore, the evaporator includes a shell, tubes, and a mounting bracket. The mounting bracket is disposed inside the shell, and the tubes are disposed on the mounting bracket. The inlet end of the tubes is connected to a first expansion valve, and the outlet end of the tubes is connected to a first solenoid valve. Several fins are disposed on the tubes, and a cleaning mechanism is disposed on the outside of the mounting bracket. In this invention, the refrigerant flows inside the tubes, and the heat exchange effect of the evaporator is increased through the several fins. Compared with current refrigeration devices, this invention is equipped with a cleaning mechanism to perform targeted cleaning of several fins, so as to avoid affecting the refrigeration effect of the test chamber.

[0012] Furthermore, the top and bottom of the mounting frame are provided with several cleaning holes. The cleaning mechanism includes a cleaning pipe and a mounting plate. There are two cleaning pipes, one of which is located on the outer side of the upper end of the mounting frame and connected to the external fan, and the other is located on the outer side of the lower end of the mounting frame and connected to the external waste gas recovery system. There are two mounting plates, which are respectively located on the upper and lower sides of the mounting frame. Each mounting plate is provided with several electromagnets. Each electromagnet has a sealing plate on the side near the fins. Each sealing plate cooperates with a cleaning hole and is connected to the mounting plate through a compression spring rod.

[0013] Furthermore, each sealing plate in this invention is made of ferromagnetic material. When the cleaning mechanism is not in operation, several sealing plates are located in several cleaning holes set on the top and bottom of the mounting frame. The air in the test chamber can only flow between several fins through several sealing plates. When the invention is finished and the operator needs to clean several fins, several electromagnets are turned on to move several sealing plates away from the cleaning holes set on the mounting frame. At this time, the external fan is turned on, and gas is delivered to the top of the mounting frame through the external fan. Through the flow of gas, impurities between several fins will fall into the bottom of the mounting frame and enter the external waste gas recovery system along the cleaning pipe on the outer side of the lower end of the mounting frame. Through the above technical solution, this invention can clean several fins in a timely and automatic manner to ensure the cooling effect of the test chamber.

[0014] Furthermore, the evaporator also includes a mounting bracket, which is provided in two sets. The two sets of mounting brackets are respectively located on the front and rear sides of the mounting frame. Each set of mounting brackets is provided with a set of isolation components, which separate several fin areas to be cleaned from the test chamber environment.

[0015] Furthermore, the isolation assembly includes a linear motor and a sliding plate. There are two linear motors, which are respectively located at the upper and lower ends of the fixed frame. The sliding plate is located between the two linear motors. The sliding plate is moved by controlling the two linear motors. The end of the sliding plate near the mounting frame is flush with the fins. The width of the sliding plate is the same as the width of the sealing plate.

[0016] During operation, if blockages are found between several fins, affecting airflow within the test chamber, the operator can activate the linear motors on the front and rear sides of the mounting frame. This causes two sliding plates to move synchronously along the frame. Each time the two sliding plates are positioned between two sealing plates on the mounting frame, the operator can activate an external fan and an electromagnet that works in conjunction with the sealing plates. The electromagnet disengages the sealing plates from the cleaning holes on the mounting frame, allowing the external fan to deliver gas to the top of the mounting frame. The gas then flows along the top of the mounting frame, between the two sliding plates, and to the bottom of the mounting frame into the external waste gas recovery system. The two sliding plates isolate the areas of the fins to be cleaned from the test chamber environment, thus preventing normal airflow within the chamber. Through this technical solution, the present invention can clean several fins while the refrigeration unit is cooling the test chamber, ensuring work efficiency and preventing the refrigeration unit from shutting down and affecting the use of the test chamber.

[0017] Furthermore, the dryer filter is internally equipped with a filter frame, which has several mounting slots. Each mounting slot can be detachably installed with a set of filter plates. The filter plates trap impurities and moisture in the refrigerant, ensuring the normal use of the refrigerant.

[0018] Furthermore, a limiting frame is also provided inside the drying filter. The limiting frame is fixedly connected to the drying filter. A rotary motor is provided on the side end of the filter frame. The rotary motor is connected to the drying filter through a support frame. A waterproof shell is provided on the outside of the rotary motor. The working end of the rotary motor is connected to the filter frame. A first replacement hole is provided on the limiting frame, and a second replacement hole is provided on the drying filter. The first replacement hole and the second replacement hole are aligned. Sealing plugs are provided in the first replacement hole and the second replacement hole. This invention controls the rotation of the filter frame within the limiting frame by a rotary motor, so as to facilitate the timely replacement of several filter plates by the operator.

[0019] Furthermore, a baffle is provided on each of the left and right sides of the end of the limiting frame near the first replacement hole. The width of the baffle is adapted to the mounting groove. During operation, the operator can move the filter plate to be replaced between the two baffles by rotating the motor. The two baffles isolate the filter plate from the internal environment of the dryer filter. At this time, the operator can remove the sealing plug from the first and second replacement holes, then remove the filter plate to be replaced from the mounting groove, and finally place the new filter plate into the mounting groove. After the new filter plate is placed in the mounting groove, the operator can put the sealing plug back into the first and second replacement holes, and then rotate the motor to release the new filter plate from between the two baffles. Through the above technical solution, the present invention achieves the purpose of replacing the filter plate inside the dryer filter without affecting the normal use of the dryer filter, thereby avoiding problems such as downtime.

[0020] A novel refrigeration method for a stability test chamber includes the following steps:

[0021] S1: The compressor is turned on, drawing in low-temperature, low-pressure refrigerant vapor from the evaporator. The vapor is then compressed into high-temperature, high-pressure gas by the compressor and condensed into liquid in the condenser.

[0022] S2: After being throttled by the first expansion valve, the refrigerant with reduced pressure and temperature enters the evaporator to vaporize and absorb heat from the test chamber.

[0023] S3: The vaporized refrigerant exits the evaporator and then enters the compressor, thus completing a refrigeration cycle.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. Compared with current refrigeration devices, this invention uses a first expansion valve instead of a capillary tube as a throttling device between the condenser and evaporator. Simultaneously, a second expansion valve is installed between the compressor inlet and the condenser outlet. A low-pressure controller and a first solenoid valve are added to the compressor inlet, and a dryer filter and a second solenoid valve are added to the inlet of the first expansion valve. The cooperation of the low-pressure controller and the second expansion valve prevents the compressor from operating at very low suction pressure, thus avoiding compressor damage, and also prevents the compressor from being damaged by prolonged exposure to excessively high suction temperatures. This results in a faster dynamic response, a higher energy efficiency ratio, and higher control precision in a wide range of operating conditions and under drastic load changes. Specifically, it achieves high-precision temperature control, significantly reduces temperature deviation and fluctuation within the test chamber, and improves temperature uniformity. The cooperation of the first and second solenoid valves facilitates the repair or replacement of malfunctioning refrigeration and control components by the operator.

[0026] 2. This invention is equipped with a cleaning mechanism and an isolation component, which effectively ensures its heat exchange performance. When the cleaning mechanism is not in operation, the sealing plate closes the cleaning holes on the mounting frame, ensuring that the air in the test chamber flows normally between the fins. After the work is completed, the electromagnet is turned on to move the sealing plate away from the cleaning holes, and the external fan delivers gas to the top of the mounting frame, blowing the impurities between the fins into the waste gas recovery system through the cleaning pipe at the lower end of the mounting frame, thus achieving automatic cleaning. When the evaporator becomes blocked during operation, affecting the air flow, the isolation component comes into play. The operator turns on the linear motor to control the sliding plate to move and isolate the area to be cleaned from the working environment. Then, the corresponding electromagnet and external fan are turned on to complete the cleaning without affecting the normal cooling operation of the test chamber, ensuring work efficiency, avoiding the shutdown of the cooling device due to evaporator blockage, and maintaining a stable low temperature environment in the test chamber.

[0027] 3. This invention features a filter frame inside the dryer filter. Several filter plates within the frame trap impurities and moisture in the refrigerant, ensuring its proper function. A rotary motor controls the filter frame's rotation within a limiting frame, facilitating timely replacement of filter plates. During operation, the rotary motor controls the movement of the filter plate to be replaced. When the filter plate moves between two baffles, these baffles isolate it from the internal environment of the dryer filter. This allows operators to replace the filter plates without affecting the normal operation of the dryer filter, thus avoiding downtime and other issues. Attached Figure Description

[0028] Figure 1 This is a flowchart of the present invention;

[0029] Figure 2This is a schematic diagram of the evaporator of the present invention;

[0030] Figure 3 This is a schematic diagram of the pipe installation structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the mounting bracket structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the cleaning mechanism structure of the present invention;

[0033] Figure 6 This is a schematic diagram showing the position of the sealing plate in this invention;

[0034] Figure 7 This is a schematic diagram of the isolation component structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the appearance of the dryer filter of the present invention;

[0036] Figure 9 This is a schematic diagram of the internal structure of the dryer filter of the present invention;

[0037] Figure 10 This is a schematic diagram of the appearance of the limiting frame of the present invention;

[0038] Figure 11 This is a schematic diagram of the filter frame structure of the present invention.

[0039] In the diagram: 1. Condenser; 2. Compressor; 3. Low-pressure controller; 4. First solenoid valve; 5. Evaporator; 51. Outer shell; 52. Pipe; 53. Fin; 54. Mounting bracket; 541. Linear motor; 542. Slide plate; 55. Mounting bracket; 551. Cleaning pipe; 552. Mounting plate; 5521. Electromagnet; 553. Cleaning hole; 5531. Sealing plate; 6. First expansion valve; 7. Second solenoid valve; 8. Dryer filter; 81. Sealing plug; 82. Limiting bracket; 821. Baffle; 83. Filter frame; 831. Filter plate; 84. Rotary motor; 9. Second expansion valve. Detailed Implementation

[0040] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example: Figures 1-11As shown, this invention provides a technical solution: a novel refrigeration device for a stability test chamber. The refrigeration device includes a condenser 1, a compressor 2, an evaporator 5, a first expansion valve 6, and a second expansion valve 9. The condenser 1 is located at the bottom of the test chamber, and the evaporator 5 is located within the working chamber of the test chamber. The inlet end of the compressor 2 is connected to the evaporator 5, and the outlet end of the compressor 2 is connected to the condenser 1. The outlet end of the first expansion valve 6 is connected to the evaporator 5, and the inlet end of the first expansion valve 6 is connected to the condenser 1. The second expansion valve 9 is located between the inlet end of the compressor 2 and the outlet end of the condenser 1. A temperature sensor installed inside the test chamber detects the temperature within the chamber's working chamber. When the PLC control system inside the test chamber detects that the temperature within the working chamber is higher than the set temperature, the compressor 2 starts operating. (Temperature sensor, PLC control system, PLC control system) The functions implemented by the LC control system are conventional techniques in this field (the specific structure and implementation method are not described). The compressor 2 draws away the low-temperature, low-pressure refrigerant vapor in the evaporator 5 and compresses it into a high-temperature, high-pressure gas. Finally, it is delivered to the condenser 1 at the bottom of the test chamber and condensed into a liquid. After being throttled by the first expansion valve 6, the refrigerant with reduced pressure and temperature enters the evaporator 5 to vaporize, thereby absorbing the heat in the test chamber. The vaporized refrigerant exits from the evaporator 5 and then enters the compressor 2 through the connecting pipe, thus completing a refrigeration cycle. In addition, in order to ensure the refrigeration effect, the centrifugal fan in the test chamber must also operate at the same time as the compressor 2, so that the air in the test chamber flows over the outer surface of the evaporator 5, thus cooling the air in the chamber. This cycle is repeated continuously to achieve the purpose of refrigeration and cooling the test chamber.

[0042] Compared to current refrigeration devices, this invention adds a second expansion valve 9 and a pressure sensor at the compressor inlet. When the pressure sensor at the compressor inlet detects that the suction pressure is lower than the lower limit of the set value, the PLC control system controls the second expansion valve 9 to open, so that some high-pressure refrigerant mixes with the low-temperature, low-pressure gaseous refrigerant from the evaporator 5 and enters the compressor inlet, thereby increasing the suction pressure of the compressor and preventing the compressor from being damaged due to prolonged low suction pressure. When the pressure sensor at the compressor inlet detects that the suction pressure is higher than the upper limit of the set value, the PLC control system controls the opening of the first expansion valve 6 to decrease, so that... The suction temperature of compressor 2 is reduced to prevent it from being damaged by prolonged exposure to excessively high suction temperatures. When the set temperature inside the test chamber is low, the actual temperature of the chamber is reduced to near the set temperature by the refrigeration system. The load is low, and the evaporator 5 is prone to freezing, which will cause the refrigeration function to gradually and rapidly decrease. At this time, the PLC control system can detect that the surface temperature of the evaporator is lower than the set value and increase the opening of the first expansion valve 6 to increase the evaporation temperature. Finally, the present invention can also use the second expansion valve 9 to reduce the condensing pressure and condensing temperature of the test chamber under high-temperature refrigeration conditions by sacrificing some refrigeration capacity, thus preventing the compressor 2 from being damaged due to excessively high exhaust temperature.

[0043] like Figure 1 As shown, the refrigeration device also includes a low-pressure controller 3, a first solenoid valve 4, a second solenoid valve 7, and a dryer filter 8. The low-pressure controller 3 and the first solenoid valve 4 are both located at the inlet end of the compressor 2. The dryer filter 8 is located between the condenser 1 and the first expansion valve 6. The second solenoid valve 7 is located at the outlet end of the dryer filter 8.

[0044] This invention controls the opening of the second expansion valve 9 through the low-pressure controller 3. This prevents damage to the compressor 2 due to excessively low or high suction pressure, and also prevents damage to the compressor 2 caused by continued operation of the product in the event of a refrigeration system leak. The use of the first solenoid valve 4 and the second solenoid valve 7 effectively improves maintenance speed and reduces maintenance costs. Specifically, when refrigeration and control components malfunction and require replacement or repair, the refrigerant can be collected on the non-faulty side for repair or replacement. Maintenance personnel do not need to release or recharge the refrigerant. This solves the problem of the inconvenience of mailing or carrying new flammable refrigerants and reduces waiting time for purchasing refrigerant, thus facilitating maintenance. The specific operating steps are as follows:

[0045] If the faulty refrigeration and control components are identified as evaporator 5 and first expansion valve 6, the PLC control system first closes the first solenoid valve 4. When the low-pressure controller 3 detects that the pressure is close to 0, it transmits a signal to the PLC control system. The PLC control system immediately closes the second solenoid valve 7, thereby collecting the refrigerant in the non-faulty side of the refrigeration system. After the faulty refrigeration and control components are repaired or replaced, the PLC control system opens the first solenoid valve 4 and the second solenoid valve 7, and the refrigeration system returns to normal operation.

[0046] Similarly, if the faulty refrigeration and control components are identified as condenser 1, compressor 2, or dryer filter 8, the PLC control system first closes the second solenoid valve 7. When the low-pressure controller detects that the pressure is close to 0, it transmits a signal to the PLC control system, which then closes the first solenoid valve 4, collecting the refrigerant on the non-faulty side of the refrigeration system. After the faulty refrigeration and control components are repaired or replaced, the PLC control system opens the first solenoid valve 4 and the second solenoid valve 7, and the refrigeration system returns to normal operation.

[0047] like Figures 2-7 As shown, the evaporator 5 includes a shell 51, a tube 52, and a mounting bracket 55. The mounting bracket 55 is disposed inside the shell 51, and the tube 52 is disposed on the mounting bracket 55. The inlet end of the tube 52 is connected to the first expansion valve 6, and the outlet end of the tube 52 is connected to the first solenoid valve 4. Several fins 53 are disposed on the tube 52. A cleaning mechanism is disposed on the outside of the mounting bracket 55. In this invention, the refrigerant flows inside the tube 52, and the heat exchange effect of the evaporator 5 is increased by the several fins 53. Compared with the current refrigeration devices, this invention is provided with a cleaning mechanism, which performs point cleaning on several fins 53 to avoid affecting the refrigeration effect of the test chamber.

[0048] like Figures 2-7 As shown, the top and bottom of the mounting frame 55 are provided with several cleaning holes 553. The cleaning mechanism includes a cleaning pipe 551 and a mounting plate 552. There are two cleaning pipes 551. One cleaning pipe 551 is located on the outer side of the upper end of the mounting frame 55 and connected to the external fan. The other cleaning pipe 551 is located on the outer side of the lower end of the mounting frame 55 and connected to the external exhaust gas recovery system. There are two mounting plates 552. The two mounting plates 552 are respectively located on the upper and lower sides of the mounting frame 55. Each mounting plate 552 is provided with several electromagnets 5521. Each electromagnet 5521 has a sealing plate 5531 on the side near the fin 53. Each sealing plate 5531 cooperates with a cleaning hole 553. Each sealing plate 5531 is connected to the mounting plate 552 through a compression spring rod.

[0049] Each sealing plate 5531 in this invention is made of ferromagnetic material. When the cleaning mechanism is not in operation, several sealing plates 5531 are located within several cleaning holes 553 provided on the top and bottom ends of the mounting bracket 55 (e.g., Figure 5 As shown, several sealing plates 5531 ensure that air in the test chamber can only flow between several fins 53. When the work of this invention is completed and the staff needs to clean the several fins 53, they only need to turn on several electromagnets 5521 to move the several sealing plates 5531 away from the cleaning holes 553 set on the mounting frame 55. At this time, the external fan is turned on, and the external fan delivers gas to the top of the mounting frame 55. Through the flow of gas, the impurities between the several fins 53 will fall into the bottom of the mounting frame 55 and enter the external waste gas recovery system along the cleaning pipe 551 on the outer side of the lower end of the mounting frame 55. Through the above technical solution, this invention can clean the several fins 53 in a timely and automatic manner to ensure the cooling effect of the test chamber.

[0050] like Figure 3 , Figure 7 As shown, the evaporator 5 also includes a fixing frame 54. There are two sets of fixing frames 54, which are respectively set on the front and rear sides of the mounting frame 55. Each set of fixing frames 54 is equipped with a set of isolation components, which separate the areas of several fins 53 to be cleaned from the test chamber environment.

[0051] like Figure 3 , Figure 7 As shown, the isolation assembly includes a linear motor 541 and a sliding plate 542. There are two linear motors 541, which are respectively located at the upper and lower ends of the fixed frame 54. The sliding plate 542 is located between the two linear motors 541. The sliding plate 542 is moved by controlling the two linear motors 541. The end of the sliding plate 542 near the mounting frame 55 is flush with the fin 53. The width of the sliding plate 542 is the same as the width of the sealing plate 5531.

[0052] During operation, if blockages are found between several fins 53, affecting airflow within the test chamber, the operator can activate the linear motors 541 on the front and rear sides of the mounting frame 55. This causes the two sliding plates 542 to move synchronously along the mounting frame 55. Each time the two sliding plates 542 are positioned between the two sealing plates 5531 on the mounting plate 552, the operator can activate the external fan and the electromagnet 5521 that works with the two sealing plates 5531. The electromagnet 5521 then disengages the two sealing plates 5531 from the cleaning holes 55 on the mounting frame 55. 3. Gas is supplied to the top of the mounting frame 55 by an external fan. At this time, the gas will flow along the top of the mounting frame 55, between the two sliding plates 542, and the bottom of the mounting frame 55 into the external waste gas recovery system. The two sliding plates 542 can separate the areas of several fins 53 to be cleaned from the test chamber environment, thereby preventing the normal flow of air in the test chamber. Through the above technical solution, the present invention can clean several fins 53 while the refrigeration device is cooling the test chamber, thereby ensuring work efficiency and preventing the refrigeration device from shutting down, so as to affect the use of the test chamber.

[0053] like Figures 8-11 As shown, the dryer filter 8 has a filter frame 83 inside, and the filter frame 83 has several mounting slots inside. Each mounting slot can be detachably installed with a set of filter plates 831. The filter plates 831 trap impurities and moisture in the refrigerant to ensure the normal use of the refrigerant.

[0054] like Figures 9-11 As shown, a limiting frame 82 is also provided inside the dryer filter 8. The limiting frame 82 is fixedly connected to the dryer filter 8. A rotary motor 84 is provided on the side end of the filter frame 83. The rotary motor 84 is connected to the dryer filter 8 through a support frame. A waterproof shell is provided on the outside of the rotary motor 84. The working end of the rotary motor 84 is connected to the filter frame 83. A first replacement hole is provided on the limiting frame 82, and a second replacement hole is provided on the dryer filter 8. The first replacement hole and the second replacement hole are aligned. A sealing plug 81 is provided in the first replacement hole and the second replacement hole. The present invention controls the filter frame 83 to rotate within the limiting frame 82 by the rotary motor 84, so as to facilitate the timely replacement of several filter plates 831 by the staff.

[0055] like Figures 9-11As shown, a baffle 821 is provided on each of the left and right sides of the end of the limiting frame 82 near the first replacement hole. The width of the baffle 821 is adapted to the mounting groove. During operation, the operator can move the filter plate 831 to be replaced between the two baffles 821 by rotating the motor 84. The two baffles 821 can isolate the filter plate 831 to be replaced from the internal environment of the dryer filter 8. At this time, the operator can remove the sealing plug 81 from the first and second replacement holes, and then remove the filter plate 831 to be replaced from the mounting groove. Finally, the new filter plate 831 is placed in the mounting groove. After the new filter plate 831 is placed in the mounting groove, the operator can put the sealing plug 81 back into the first and second replacement holes, and then rotate the motor 84 to move the new filter plate 831 away from between the two baffles 821. Through the above technical solution, the present invention achieves the purpose of replacing the filter plate 831 in the dryer filter 8 without affecting the normal use of the dryer filter 8, thereby avoiding problems such as downtime.

[0056] The working principle of this invention is as follows: A temperature sensor installed inside the test chamber detects the temperature inside the chamber, i.e., the working chamber. When the PLC control system inside the test chamber detects that the temperature inside the working chamber is higher than the set temperature, the compressor 2 starts working. The compressor 2 draws away the low-temperature, low-pressure refrigerant vapor in the evaporator 5 and compresses it into a high-temperature, high-pressure gas. Finally, it is delivered to the condenser 1 at the bottom of the test chamber and condensed into a liquid. After being throttled by the first expansion valve 6, the refrigerant with reduced pressure and temperature enters the evaporator 5 to vaporize, absorbing heat from the working chamber. The vaporized refrigerant exits from the evaporator 5 and then enters the compressor 2 through a connecting pipe, thus completing a refrigeration cycle. During operation, if the pressure sensor at the inlet of the compressor 2 detects that the suction pressure is lower than the set lower limit, the PLC control system controls the second expansion valve 9 to open, so that some of the high-pressure refrigerant reacts with the low-temperature, low-pressure gas exiting from the evaporator 5. The gaseous refrigerant mixes and enters the inlet of compressor 2, thereby increasing the suction pressure of compressor 2. If the pressure sensor at the inlet of compressor 2 detects that the suction pressure is higher than the upper limit of the set value, the PLC control system controls the opening of the first expansion valve 6 to decrease, so as to reduce the suction temperature of compressor 2. If the set temperature in the test chamber is low, the PLC control system detects that the surface temperature of the evaporator is lower than the set value and increases the opening of the first expansion valve 6, thereby increasing the evaporation temperature. Finally, after the work is completed, the operator turns on several electromagnets 5521 to move several sealing plates 5531 away from the cleaning holes 553 set on the mounting frame 55. At this time, the external fan is turned on, and the external fan delivers gas to the top of the mounting frame 55. Through the flow of gas, the impurities between several fins 53 will fall into the bottom of the mounting frame 55 and enter the external waste gas recovery system along the cleaning pipe 551 on the outer side of the lower end of the mounting frame 55.

[0057] Another embodiment of this application provides a novel cooling method for a stability test chamber, comprising the following steps:

[0058] S1: Start compressor 2 to draw in low-temperature, low-pressure refrigerant vapor from evaporator 5, compress it into high-temperature, high-pressure gas through compressor 2, and condense it into liquid in condenser 1;

[0059] S2: After being throttled by the first expansion valve 6, the refrigerant with reduced pressure and temperature enters the evaporator 5 to vaporize and absorb the heat in the test chamber.

[0060] S3: The vaporized refrigerant exits from the evaporator 5 and then enters the compressor 2, thus completing a refrigeration cycle.

[0061] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel refrigeration device for a stability test chamber, characterized in that: The refrigeration device includes a condenser (1), a compressor (2), an evaporator (5), a first expansion valve (6), and a second expansion valve (9). The condenser (1) is located at the bottom of the test chamber, and the evaporator (5) is located in the working chamber of the test chamber. The inlet end of the compressor (2) is connected to the evaporator (5), and the outlet end of the compressor (2) is connected to the condenser (1). The outlet end of the first expansion valve (6) is connected to the evaporator (5), and the inlet end of the first expansion valve (6) is connected to the condenser (1). The second expansion valve (9) is located between the inlet end of the compressor (2) and the outlet end of the condenser (1). The evaporator (5) includes a shell (51), a tube (52) and a mounting bracket (55). The mounting bracket (55) is located inside the shell (51). The tube (52) is located on the mounting bracket (55). The inlet end of the tube (52) is connected to the first expansion valve (6), and the outlet end of the tube (52) is connected to the first solenoid valve (4). The tube (52) is provided with a number of fins (53). A cleaning mechanism is provided on the outside of the mounting bracket (55) to perform point cleaning on the number of fins (53). The evaporator (5) also includes a fixing frame (54), which is provided in two sets. The two sets of fixing frames (54) are respectively set on the front and rear sides of the mounting frame (55). Each set of fixing frames (54) is provided with a set of isolation components, which separate the areas of several fins (53) to be cleaned from the environment of the test chamber through the isolation components. The isolation assembly includes a linear motor (541) and a sliding plate (542). There are two linear motors (541), which are respectively located at the upper and lower ends of the fixed frame (54). The sliding plate (542) is located between the two linear motors (541). The sliding plate (542) is moved by controlling the two linear motors (541). The end of the sliding plate (542) near the mounting frame (55) is flush with the fin (53). The width of the sliding plate (542) is the same as the width of the sealing plate (5531).

2. A novel refrigeration device for a stability test chamber according to claim 1, characterized in that: The refrigeration device also includes a low-pressure controller (3), a first solenoid valve (4), a second solenoid valve (7), and a dryer filter (8). The low-pressure controller (3) and the first solenoid valve (4) are both located at the inlet end of the compressor (2). The dryer filter (8) is located between the condenser (1) and the first expansion valve (6). The second solenoid valve (7) is located at the outlet end of the dryer filter (8).

3. A novel refrigeration device for a stability test chamber according to claim 1, characterized in that: The mounting frame (55) is provided with several cleaning holes (553) at both the top and bottom. The cleaning mechanism includes a cleaning pipe (551) and a mounting plate (552). There are two cleaning pipes (551). One cleaning pipe (551) is located on the outer side of the upper end of the mounting frame (55) and connected to the external fan. The other cleaning pipe (551) is located on the outer side of the lower end of the mounting frame (55) and connected to the external waste gas recovery system. There are two mounting plates (552). The two mounting plates (552) are respectively located on the upper and lower sides of the mounting frame (55). Each mounting plate (552) is provided with several electromagnets (5521). Each electromagnet (5521) is provided with a sealing plate (5531) on the side near the fin (53). Each sealing plate (5531) is matched with a cleaning hole (553). Each sealing plate (5531) is connected to the mounting plate (552) through a compression spring rod.

4. A novel refrigeration device for a stability test chamber according to claim 2, characterized in that: The dryer filter (8) is provided with a filter frame (83) inside. The filter frame (83) is provided with several mounting slots inside. Each mounting slot can be detachably installed with a set of filter plates (831).

5. A novel refrigeration device for a stability test chamber according to claim 4, characterized in that: The drying filter (8) is also provided with a limiting frame (82), which is fixedly connected to the drying filter (8). A rotary motor (84) is provided on the side of the filter frame (83), and the working end of the rotary motor (84) is connected to the filter frame (83). A first replacement hole is provided on the limiting frame (82), and a second replacement hole is provided on the drying filter (8). The first replacement hole and the second replacement hole are aligned with each other, and a sealing plug (81) is provided in the first replacement hole and the second replacement hole.

6. A novel refrigeration device for a stability test chamber according to claim 5, characterized in that: The limiting frame (82) has a baffle (821) on each of the left and right sides near the first replacement hole. The width of the baffle (821) is adapted to the mounting groove.

7. A novel refrigeration method for a stability test chamber, based on the novel refrigeration device for a stability test chamber as described in claim 1, characterized in that, Includes the following steps: S1: Start the compressor (2) to draw in low-temperature and low-pressure refrigerant vapor from the evaporator (5), compress it into high-temperature and high-pressure gas through the compressor (2), and enter the condenser (1) to condense it into liquid; S2: After being throttled by the first expansion valve (6), the refrigerant with reduced pressure and temperature enters the evaporator (5) to vaporize and absorb the heat in the test chamber. S3: The vaporized refrigerant exits from the evaporator (5) and then enters the compressor (2), thus completing a refrigeration cycle.

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