Walk-in dual chamber test chamber

Abstract

The utility model relates to a kind of step-in type double-box test box, gate lifting device is fixed in the middle of double-box;Passage is set in the middle of double-box and gate lifting device;Mobile platform is set in passage;Servo drag device is movably connected below mobile platform;Servo drag device drags mobile platform to any side in double-box in passage;Gate lifting device lowers heat-insulating door, double-box is heat-insulated, double-box carries out temperature impact environment test, and driving mechanism is isolated outside extreme temperature and humidity environment.This layout design makes that equipment structure is compact, each functional area division is clear. The structure and performance of left and right two sides cabin are consistent, and high-strength, heat-insulating material is used to make box shell, effectively reduce heat transfer, ensure the stability of temperature in cabin. Air duct system is set in cabin, ensure temperature uniformity.

Description

Technical Field

[0001] This utility model relates to a test chamber in the field of environmental testing equipment, specifically to a temperature shock environmental test chamber and a walk-in high and low temperature humidity test chamber. The temperature shock environmental test chamber is mainly used to simulate the performance of products under rapidly changing high and low temperature environments, and is a key piece of equipment for product reliability testing in industries such as electronics, aerospace, automotive, and new energy. In particular, it relates to a walk-in dual-chamber test chamber. Background Technology

[0002] Traditional cylinder-driven defects: Existing temperature shock test chambers generally use cylinder-driven basket structures, which results in a large amount of effective space in the inner chamber being occupied (such as the basket support and transmission mechanism occupying about 30% of the volume), and the load-bearing capacity is limited (usually ≤500kg), which cannot meet the testing requirements of heavy samples such as large power battery packs (such as commercial vehicle battery packs weighing up to 800-1000kg).

[0003] The problem of limited functionality: Traditional equipment can only perform temperature shock tests, resulting in high idle rates during non-testing periods and occupying a large area. According to industry research, the average annual usage time of enterprise equipment is less than 1800 hours, leading to serious resource waste.

[0004] Low energy efficiency: Traditional temperature shock test chambers and high and low temperature humidity test chambers mostly use independent refrigeration systems. Even in single-function equipment, the capacity of the refrigeration unit is often designed according to the maximum cooling demand. In actual use, especially when conducting tests with relatively small cooling requirements, energy waste is quite serious. Moreover, the independent operation of multiple devices makes it impossible to achieve reasonable energy allocation and sharing, resulting in high operating costs for enterprises. Utility Model Content

[0005] The purpose of this utility model is to provide a multifunctional testing device that can effectively integrate temperature shock testing and high and low temperature damp heat testing functions, thereby improving the utilization rate of the equipment. At the same time, by optimizing the refrigeration system and spatial layout, it achieves efficient energy utilization and rational use of the internal space of the equipment, thereby reducing the equipment procurement and operating costs of enterprises.

[0006] To achieve the above objectives, the first embodiment of this utility model designs a walk-in dual-chamber test chamber, comprising:

[0007] Double-box design;

[0008] A gate lifting device is fixed in the middle of the double-box body;

[0009] The passage is provided between the double-box body and the gate lifting device;

[0010] A mobile platform is installed within the channel;

[0011] A servo-driven device is movably connected below the mobile platform; the servo-driven device drags the mobile platform within the channel to either side of the double-box housing; the gate lifting device lowers the insulation door to insulate the double-box housing, and the double-box housing undergoes a temperature shock environment test.

[0012] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, the dual chamber is a temperature shock environment test chamber or a high and low temperature humidity test chamber.

[0013] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, the dual chambers further include:

[0014] The left housing is fixedly connected to the left side of the gate lifting device;

[0015] The right housing is fixedly connected to the left side of the gate lifting device;

[0016] After the left box, the right box, and the gate lifting device are connected, the channel is set up, and the mobile platform shuttles back and forth between the left box and the right box within the channel.

[0017] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, the gate lifting device further includes:

[0018] The outer casing is provided outside the gate lifting device;

[0019] A bracket, wherein the bracket is disposed within the housing;

[0020] Linear guide rails, two of which are fixed on both sides of the bracket;

[0021] A pulley is movably connected within the linear guide rail; two pulleys are fixed on each side of the insulation door;

[0022] A transmission rack is fixed to one side of the housing;

[0023] A servo motor, with the base of the servo motor fixedly connected to the upper end of the door insulation panel;

[0024] A gear is fixed on the output shaft of the servo motor; the gear meshes with the transmission rack.

[0025] Upper pulleys: one set of upper pulleys is provided on one side of the upper end of the door; two sets of upper pulleys are provided on the other side of the upper end of the door.

[0026] A steel wire rope, with one end of the steel wire rope fixed at each of the two ends of the insulation door;

[0027] The other end of the steel wire rope passes over the top of the bracket, then around the upper pulley and is connected to the door counterweight.

[0028] A counterweight cover is fixed to the side of the bracket on the outside of the door counterweight block; the door counterweight block moves up and down inside the counterweight cover.

[0029] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, an insulating door is movably connected to the right side of the left chamber and the left side of the right chamber, respectively.

[0030] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, the channel passes through the right side of the left chamber of the dual chamber, the outer shell of the gate lifting device, and the left side of the right chamber.

[0031] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, a moving guide rail is provided below the moving platform; and the servo dragging device is provided in the middle of the moving platform.

[0032] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, the servo drive device further includes:

[0033] A motor bracket is fixed to the left side of the left housing of the double housing.

[0034] A servo drive motor, with the housing of the servo drive motor fixed to the side of the motor bracket;

[0035] A drive sprocket is fixed on the output shaft of the servo drive motor.

[0036] The passive wheel bracket is fixed to the right side of the right housing of the dual-housing structure.

[0037] A passive sprocket, with two passive sprockets movably connected side-by-side on one side of the passive sprocket bracket;

[0038] The tension sprocket is located on the other side of the driven sprocket bracket and is movably connected between the two driven sprockets.

[0039] A drive chain is located below the moving platform, surrounding the drive sprocket and the driven sprocket, with the tension sprocket abutting against the drive chain on the outside of the drive chain.

[0040] Platform slide rails, with several of the platform slide rails fixed below the mobile platform;

[0041] A platform slider is movably connected to a platform slide rail; the platform slider slides on the platform slide rail; and the movable platform is fixed above the platform slider.

[0042] Furthermore, in the walk-in dual-chamber test chamber described in this utility model, a dual-cooling device is connected to both the left and right chambers; an evaporator is installed in both the left and right chambers, with one end of a hot gas bypass solenoid valve connected to the evaporator, the other end of which is connected to one end of an expansion valve, and the other end of the expansion valve is connected to one end of a solenoid valve; the other end of the solenoid valve is connected to the outlet end of the dual-cooling device; the solenoid valve and the hot gas bypass solenoid valve are switches for controlling the cooling of the dual-cooling device, and the evaporator cools the left and right chambers respectively.

[0043] The sum of the cooling requirements of the left and right chambers is less than 100%. The opening time of the solenoid valve in the left chamber is T*P_left_chamber, the opening time of the solenoid valve in the right chamber is T*P_right_chamber, and the opening time of the hot gas bypass solenoid valve is T(1-P_right). 左箱体 -P 右箱体 ), T is the control period, P 左 Box and P 右箱 The percentage of cooling demand calculated by the PID controllers for the left and right cabinets.

[0044] Compared with the prior art, the implementation of this utility model involves fixing a gate lifting device in the middle of the double-chamber structure; setting a channel between the double-chamber structure and the gate lifting device; setting a moving platform within the channel; and movably connecting a servo drive device below the moving platform. The servo drive device drags the moving platform to either side of the double-chamber structure within the channel. The gate lifting device lowers the insulation door to insulate the double-chamber structure, allowing for temperature shock environmental testing. This utility model adopts a symmetrical layout, with large-volume chambers on both sides, which can be used as two independent temperature and humidity test chambers or combined for temperature shock testing. The central area houses the normal-temperature driven gate movement mechanism and the platform conversion mechanism, isolating the drive mechanism from extreme temperature and humidity environments. This layout design results in a compact equipment structure and clearly defined functional areas. The structure and performance of the left and right chambers are consistent, both using high-strength, heat-insulating materials for the outer shell, such as double-layer stainless steel plates filled with polyurethane foam, achieving a thermal conductivity as low as 0.025 W / (m·K), effectively reducing heat transfer and ensuring temperature stability within the chamber. The cabin is equipped with an air duct system to ensure temperature uniformity.

[0045] In temperature shock mode, this invention allows either the left or right chamber to be used as a high-temperature chamber and the other as a low-temperature chamber. Isolation and switching between the high and low temperature zones are achieved via a central lifting gate.

[0046] This invention employs a single refrigeration unit to provide cooling for both left and right compartments. The refrigeration unit utilizes an intelligent cooling capacity distribution system, capable of precisely allocating cooling capacity according to the actual cooling needs of each compartment. For example, by monitoring the temperature in real time through temperature sensors installed within the compartments, when one compartment has a higher temperature and requires more cooling, the refrigeration unit can automatically adjust the refrigerant flow rate to prioritize meeting the needs of that side. Compared to traditional independent refrigeration systems, this cooling capacity distribution method can achieve energy savings of up to 30%. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of this utility model;

[0048] Figure 2 This is a schematic diagram of the servo drive device of this utility model;

[0049] Figure 3 This is a schematic diagram of the gate lifting device of this utility model;

[0050] Figure 4 This is a schematic diagram of the dual-element refrigeration device of this utility model;

[0051] Figure 5 This is a schematic diagram of the control method of this utility model. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0053] The embodiments of this utility model relate to a walk-in dual-chamber test chamber, such as... Figures 1-4 As shown, it includes:

[0054] In this embodiment, the walk-in dual-chamber test chamber is equipped with two chambers 100.

[0055] A gate lifting device 200 is fixed in the middle of the double-box body 100; the gate lifting device 200 is used to lift the insulation door 3 set in the middle of the double-box body 100.

[0056] A passage 1 is provided between the double-box body 100 and the gate lifting device 200;

[0057] A mobile platform 2 is installed within channel 1;

[0058] Channel 1 serves as the mobile channel for mobile platform 2;

[0059] Servo drive device 300 is movably connected below the moving platform 2; the servo drive device 300 drags the moving platform 2 to either side of the double chamber 100 within the channel 1; the gate lifting device 200 lowers the insulating door 3 to insulate the double chamber 100, and the double chamber 100 undergoes a temperature shock environment test.

[0060] The walk-in dual-chamber test chamber in this embodiment adopts a symmetrical layout, with large-volume chambers on both sides. These can be used as two independent temperature and humidity test chambers, or combined for temperature shock testing. The central area is at room temperature and houses the gate lifting device 200 and the moving platform 2, isolating the drive mechanism from extreme temperature and humidity environments. This results in a compact structure and clearly defined functional areas. The left and right chambers have identical structures and performance. In temperature shock mode, one chamber can be used as the high-temperature chamber, and the other as the low-temperature chamber. Isolation and switching between high and low temperature zones are achieved through the central lifting gate.

[0061] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-5As shown, the double-chamber 100 can be used as a temperature shock environment test chamber or as a high and low temperature humidity test chamber. Both are made of high-strength materials with good thermal insulation performance. For example, double-layer stainless steel plates are filled with polyurethane foam material in the middle, with a thermal conductivity as low as 0.025W / (m·K), which effectively reduces heat transfer and ensures the stability of the temperature inside the chamber.

[0062] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, the double-box 100 also includes:

[0063] The left housing 4 is fixedly connected to the left side of the gate lifting device 200;

[0064] The right housing 5 is fixedly connected to the left side of the gate lifting device 200; the left housing 4 and the right housing 5 constitute the main structure of the double housing 100.

[0065] After the left box 4, right box 5 and gate lifting device 200 are connected, a channel 1 is set up, and the mobile platform 2 shuttles back and forth between the left box 4 and right box 5 in the channel 1.

[0066] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, the gate lifting device 200 also includes:

[0067] An outer casing 201 is provided outside the gate lifting device 200;

[0068] A bracket 202 is installed inside the outer casing 201; the outer casing 201 and the bracket 202 constitute the outer casing frame of the gate lifting device 200;

[0069] Two linear guide rails 203 are fixed on both sides of the bracket 202;

[0070] A pulley 204 is movably connected within the linear guide rail 203; two pulleys 204 are fixed on each side of the door insulation 3; the pulleys 204 move up and down within the linear guide rail 203, realizing the up and down movement of the door insulation 3.

[0071] A transmission rack 205 is fixed on one side of the housing 201; the transmission rack 205 is used for transmission.

[0072] The upper end of the door 3 is fixedly connected to the base of the servo motor 206; the servo motor 206 provides the power for the up and down movement of the door 3.

[0073] A gear 207 is fixed on the output shaft of the servo motor 206; the gear 207 meshes with the transmission rack 205; the servo motor 206 drives the gear 207 to rotate, and through the transmission rack 205, the door 3 moves up and down on the linear guide rail 203.

[0074] A set of upper pulleys is installed on one side of the upper end of the door 3; two sets of upper pulleys 208 are installed on the other side of the upper end of the door 3.

[0075] Fix one end of the steel wire rope 209 to each end of the insulation door 3.

[0076] The other end of the steel wire rope 209 passes over the support 202, then around the upper pulley 208 and connects to the door counterweight 210. The steel wire rope 209 is wrapped around the upper pulley 208, and the weight of the door counterweight 210 provides counterweight to the door 3 during its movement.

[0077] A counterweight cover 211 is fixed to the side of the bracket 202 on the outside of the door counterweight block 210; the door counterweight block 210 moves up and down inside the counterweight cover 211. The counterweight cover 211 serves a protective function, shielding the door counterweight block 210.

[0078] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, an insulation door 3 is movably connected to the right side of the left housing 4 and the left side of the right housing 5.

[0079] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-5 As shown, channel 1 passes through the right side of the left box 4 of the double box 100, the outer shell of the gate lifting device 200, and the left side of the right box 5.

[0080] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, a moving guide rail 6 is set below the moving platform 2; a servo dragging device 300 is set in the middle of the moving platform 2.

[0081] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, the servo drive device 300 also includes:

[0082] Motor bracket 301 is fixed on the left side of the left housing 4 of the double housing 100;

[0083] The housing of the servo drive motor 302 is fixed to the side of the motor bracket 301;

[0084] A drive sprocket 303 is fixed on the output shaft of the servo drive motor 302;

[0085] The passive wheel bracket 304 is fixed on the right side of the right housing of the double-box housing.

[0086] Two passive sprockets 305 are movably connected side by side on one side of the passive sprocket bracket 304;

[0087] On the other side of the passive wheel bracket 304, a tension sprocket 306 is movably connected between the two passive sprockets 305;

[0088] Below the mobile platform 2, a transmission chain 307 is wrapped around the drive sprocket 303 and the driven sprocket 305. On the outside of the transmission chain 307, a tension sprocket 306 abuts against the transmission chain 307. The drive sprocket 303, the driven sprocket 305, the tension sprocket 306 and the transmission chain 307 constitute the chain drive device of the mobile platform 2. The servo drive motor 302 drives the drive sprocket 303, and moves the mobile platform 2 within the left housing 4, the right housing 5 and the set channel 1 through the transmission chain 307.

[0089] Several platform slide rails 308 are fixed below the mobile platform 2;

[0090] A platform slider 308 is movably connected to a platform slide rail 308; the platform slider 308 slides on a platform slide rail 309; a movable platform 2 is fixed above the platform slider 309. The platform slider 309 moves on the platform slide rail 308.

[0091] To achieve the above-mentioned technical effects, the walk-in dual-chamber test chamber in this embodiment, such as... Figures 1-4 As shown, a dual-stage refrigeration unit 400 is connected to both the left casing 4 and the right casing 5. An evaporator 7 is installed inside both the left casing 4 and the right casing 5. One end of a hot gas bypass solenoid valve 10 is connected to the evaporator 7, and the other end of the hot gas bypass solenoid valve 10 is connected to one end of an expansion valve 8. The other end of the expansion valve 8 is connected to one end of a solenoid valve 9. The other end of the solenoid valve 9 is connected to the outlet end of the dual-stage refrigeration unit 400. The solenoid valve 9 and the hot gas bypass solenoid valve 10 are switches that control the cooling of the dual-stage refrigeration unit 400. The evaporator 7 cools the left casing 4 and the right casing 5 respectively.

[0092] The sum of the cooling demands of the left casing 4 and the right casing 5 is less than 100%. The opening time of solenoid valve 9 in the left casing 4 is T*P (left casing), and the opening time of solenoid valve 9 in the right casing 5 is T*P (right casing). The opening time of hot gas bypass solenoid valve 10 is T(1-P). 左箱体 -P 右箱体 ), T is the control period, P 左 Box and P 右箱 The percentage of cooling demand calculated by the PID controllers for the left and right cabinets.

[0093] For example: the left compartment needs 65% of the cooling capacity and the right compartment needs 10% of the cooling capacity. If the control cycle is 10 seconds, then the opening time of the left compartment solenoid valve (49) is 10*65%=6.5 seconds, the opening time of the right compartment solenoid valve (49) is 10*10%=1.0 seconds, and the opening time of the hot gas bypass solenoid valve (58) is 2.5 seconds.

[0094] If the sum of the cooling demand of the left and right boxes is greater than 100%, then the opening time of the left box solenoid valve is T*P left box / (P left box + P right box), the opening time of the right box solenoid valve is T*P right box / (P left box + P right box), and the opening time of the hot gas bypass valve (58) is 0.

[0095] For example: the left compartment needs 80% of the cooling capacity and the right compartment needs 40% of the cooling capacity. If the control cycle is 10 seconds, then the opening time of the left compartment solenoid valve (49) is 10*80% / (80%+60%) = 5.71 seconds, the opening time of the right compartment solenoid valve (49) is 10*60% / (80%+60%) = 4.29 seconds, and the opening time of the hot gas bypass solenoid valve (58) is 0 seconds.

[0096] The control method of this utility model, such as Figure 5 As shown, it includes the following steps:

[0097] Step S10: After powering on, the walk-in dual-chamber test chamber in this embodiment enters standby mode; proceed to step S20.

[0098] Step S20: Select mode, select temperature shock, proceed to step S100; select independent test, proceed to step S200.

[0099] Step S100: Independent heating / cooling in high and low temperature zones, proceed to step S110;

[0100] Step S110: Mobile platform 2 enters the high-temperature zone; proceed to step S120;

[0101] Step S120: Temperature holding time in high-temperature zone; Proceed to step S130;

[0102] Step S130: Activate insulation door 3; Proceed to step S140;

[0103] Step S140: The mobile platform 2 enters the low-temperature zone, proceeding to step S150;

[0104] Step S150, start the low-temperature zone insulation timer, then proceed to step S160;

[0105] Step S160, loop complete. If "yes", proceed to step S170; if "no", return to step S130.

[0106] Step S170: Mobile platform 2 is reset;

[0107] Step S200: Close the insulation door; Proceed to step S210;

[0108] Step S210: Set target parameters for high and low temperature zones respectively; Proceed to step S220;

[0109] In step S220, the left chamber 4 and the right chamber 5 operate under independent temperature control.

[0110] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A walk-in dual-chamber test chamber, characterized in that, include: Double-box design; A gate lifting device is fixed in the middle of the double-box body; The passage is provided between the double-box body and the gate lifting device; A mobile platform is installed within the channel; A servo-driven device is movably connected below the mobile platform; the servo-driven device drags the mobile platform within the channel to either side of the double-box housing; the gate lifting device lowers the insulation door to insulate the double-box housing, and the double-box housing undergoes a temperature shock environment test.

2. The walk-in dual-chamber test chamber according to claim 1, characterized in that, The dual chambers are either temperature shock environment test chambers or high and low temperature humidity test chambers.

3. The walk-in dual-chamber test chamber according to claim 2, characterized in that, The dual-box structure also includes: The left housing is fixedly connected to the left side of the gate lifting device; The right housing is fixedly connected to the left side of the gate lifting device; After the left box, the right box, and the gate lifting device are connected, the channel is set up, and the mobile platform shuttles back and forth between the left box and the right box within the channel.

4. The walk-in dual-chamber test chamber according to claim 1, characterized in that, The gate lifting device further includes: The outer casing is provided outside the gate lifting device; A bracket, wherein the bracket is disposed within the housing; Linear guide rails, two of which are fixed on both sides of the bracket; A pulley is movably connected within the linear guide rail; two pulleys are fixed on each side of the insulation door; A transmission rack is fixed to one side of the housing; A servo motor, with the base of the servo motor fixedly connected to the upper end of the door insulation panel; A gear is fixed on the output shaft of the servo motor; the gear meshes with the transmission rack. Upper pulleys: one set of upper pulleys is provided on one side of the upper end of the door; two sets of upper pulleys are provided on the other side of the upper end of the door. A steel wire rope, with one end of the steel wire rope fixed at each of the two ends of the insulation door; The other end of the steel wire rope passes over the top of the bracket, then around the upper pulley and is connected to the door counterweight. A counterweight cover is fixed to the side of the bracket on the outside of the door counterweight block; the door counterweight block moves up and down inside the counterweight cover.

5. The walk-in dual-chamber test chamber according to claim 3, characterized in that, An insulation door is movably connected to the right side of the left housing and the left side of the right housing, respectively.

6. The walk-in dual-chamber test chamber according to claim 1, characterized in that, The channel runs through the right side of the left box of the double-box structure, the outer shell of the gate lifting device, and the left side of the right box.

7. The walk-in dual-chamber test chamber according to claim 1, characterized in that, A moving guide rail is provided below the moving platform; the servo dragging device is provided in the middle of the moving platform.

8. The walk-in dual-chamber test chamber according to claim 7, characterized in that, The servo drive device further includes: A motor bracket is fixed to the left side of the left housing of the double housing. A servo drive motor, with the housing of the servo drive motor fixed to the side of the motor bracket; A drive sprocket is fixed on the output shaft of the servo drive motor. The passive wheel bracket is fixed to the right side of the right housing of the dual-housing structure. A passive sprocket, with two passive sprockets movably connected side-by-side on one side of the passive sprocket bracket; The tension sprocket is located on the other side of the driven sprocket bracket and is movably connected between the two driven sprockets. A drive chain is located below the moving platform, surrounding the drive sprocket and the driven sprocket, with the tension sprocket abutting against the drive chain on the outside of the drive chain. Platform slide rails, with several of the platform slide rails fixed below the mobile platform; A platform slider is movably connected to a platform slide rail; the platform slider slides on the platform slide rail; and the movable platform is fixed above the platform slider.

9. The walk-in dual-chamber test chamber according to claim 3, characterized in that, A dual-stage refrigeration unit is connected to both the left and right housings. Evaporators are installed in both housings, with one end of a hot gas bypass solenoid valve connected to each. The other end of the hot gas bypass solenoid valve is connected to one end of an expansion valve, and the other end of the expansion valve is connected to one end of a solenoid valve. The other end of the solenoid valve is connected to the outlet of the dual-stage refrigeration unit. The solenoid valve and the hot gas bypass solenoid valve are switches that control the cooling of the dual-stage refrigeration unit, cooling the left and right housings respectively through the evaporators. The sum of the cooling requirements of the left and right chambers is less than 100%. The opening time of the solenoid valve in the left chamber is T*P_left_chamber, the opening time of the solenoid valve in the right chamber is T*P_right_chamber, and the opening time of the hot gas bypass solenoid valve is T(1-P_right). 左箱体 -P 右箱体 T is the control period, P 左 Box and P 右箱 The percentage of cooling demand calculated by the PID controllers for the left and right cabinets.

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