Constant-humidity and constant-temperature test box

Abstract

The invention particularly relates to a constant-humidity and constant-temperature test box which comprises a test box main body, a heat recovery mechanism and a vacuum pump, a test cavity is formed in the test box main body; the heat recovery mechanism is installed on the side wall of the test box body and comprises a heat recovery box, a vacuum cavity and an installation cavity are formed in the heat recovery box, an air suction pipe and an air return pipe are installed on the heat recovery box, the end, located in the test cavity, of the air suction pipe is connected with an air collection hood, and the vacuum cavity is communicated with the test cavity through the air suction pipe and the air return pipe. A first control valve is installed on the air suction pipe, a second control valve is installed on the air return pipe, and an air outlet is formed in the side wall of the heat recovery box. According to the constant-temperature and constant-humidity test box, heat energy in the constant-temperature and constant-humidity test box can be efficiently recycled, waste of heat energy resources in the constant-temperature and constant-humidity test box is effectively avoided, then the utilization rate of the heat energy resources can be greatly increased, and meanwhile the overall energy consumption when the constant-temperature and constant-humidity test box is reused can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of test chambers, and particularly relates to a constant temperature and humidity test chamber. Background Art

[0002] A test chamber is a device used to simulate products under specific environmental conditions. It simulates the performance of products in real usage environments by controlling parameters such as temperature, humidity, and wind speed. Test chambers are widely used in multiple fields such as electronics, electrical appliances, automobiles, building materials, etc., for testing the heat resistance, cold resistance, moisture resistance, etc. of products.

[0003] There are many types of test chambers on the market, such as constant temperature and humidity test chambers, thermal shock test chambers, vacuum test chambers, rapid temperature change test chambers, yellowing resistance test chambers, and ozone aging test chambers, etc. Among them, a constant temperature and humidity test chamber simulates the performance of products under different environments by controlling temperature and humidity. However, when the existing constant temperature and humidity test chambers are in use, they are not energy-saving and environmentally friendly enough. They cannot efficiently recover the heat energy in the test chamber, resulting in the easy loss of heat energy in the constant temperature and humidity test chamber, thus easily causing waste of heat energy resources and increasing the energy consumption when the constant temperature and humidity test chamber is used again.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a constant temperature and humidity test chamber.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a constant temperature and humidity test chamber, which can solve the problem that the constant temperature and humidity test chamber cannot recover heat energy.

[0007] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A constant temperature and humidity test chamber includes: a test chamber main body, a heat recovery mechanism, and a vacuum pump;

[0009] A test cavity is provided inside the test chamber main body;

[0010] The heat recovery mechanism is installed on the side wall of the test chamber main body. The heat recovery mechanism includes a heat recovery box. A vacuum cavity and an installation cavity are provided inside the heat recovery box. An air suction pipe and a return air pipe are installed on the heat recovery box. One end of the air suction pipe located inside the test cavity is connected with a gas collection hood. The vacuum cavity is respectively connected with the test cavity through the air suction pipe and the return air pipe. A first control valve is installed on the air suction pipe, a second control valve is installed on the return air pipe, and an air outlet is provided on the side wall of the heat recovery box;

[0011] The vacuum pump is installed in the installation cavity. A suction pipe and an air outlet pipe are connected to the vacuum pump. One end of the suction pipe is arranged in the vacuum cavity. A third control valve is installed on the suction pipe. The air outlet pipe corresponds to the air outlet.

[0012] In one or more embodiments of the present invention, an air outlet auxiliary mechanism is installed in the heat recovery box. The air outlet auxiliary mechanism is used to change the space of the vacuum cavity, and thus can quickly discharge the heat-carrying gas temporarily stored in the vacuum cavity.

[0013] The air outlet auxiliary mechanism includes a cylinder. The fixed end of the cylinder is arranged outside the heat recovery box, and the free end of the cylinder is arranged in the vacuum cavity. The cylinder is used to drive a moving plate to move in the vacuum cavity, so as to quickly discharge the heat-carrying gas temporarily stored in the vacuum cavity by using the movement of the moving plate.

[0014] In one or more embodiments of the present invention, one end of the cylinder located in the vacuum cavity is connected to a moving plate. The moving plate is slidably arranged in the vacuum cavity. The heat-carrying gas temporarily stored in the vacuum cavity is quickly discharged by the movement of the moving plate, so as to improve the subsequent experimental efficiency.

[0015] A sealing gasket is connected to the side of the moving plate away from the cylinder. The sealing gasket is made of rubber. The sealing gasket can be used to increase the contact effect between the moving plate and the side wall of the vacuum cavity, and avoid the leakage of the heat-carrying gas in the vacuum cavity.

[0016] In one or more embodiments of the present invention, a pair of guide rods are installed on the side wall of the vacuum cavity. The guide rods can guide the movement of the moving plate and avoid the deviation of the moving plate during movement.

[0017] A limiting block is connected to the end of the guide rod. The limiting block is used to limit the moving distance of the moving plate.

[0018] The moving plate is slidably connected to the guide rods. The upper guide rod is made of plastic, and the lower guide rod is made of heat-conducting metal, ensuring that one of the guide rods has a certain strength and avoiding the fracture of the guide rod.

[0019] In one or more embodiments of the present invention, a storage cavity is provided in the heat recovery box. A heat exchange liquid is provided in the storage cavity. When the heat-carrying gas is temporarily stored in the vacuum cavity, since one of the guide rods is made of heat-conducting metal, the heat-conducting metal guide rod will absorb a certain amount of heat. The heat exchange liquid can be used to absorb the heat absorbed by the heat-conducting metal guide rod and avoid the loss of heat on the guide rod.

[0020] In one or more embodiments of the present invention, a communicating pipe is connected to the lower side wall of the storage cavity, and the storage cavity is communicated with the vacuum cavity through the communicating pipe, so that the heat exchange liquid can flow between the storage cavity and the vacuum cavity.

[0021] In one or more embodiments of the present invention, a plug is installed on the moving plate, and the plug corresponds to the communicating pipe. When the cylinder contracts, the moving plate contacts the side wall of the vacuum cavity. At this time, the plug will block the communicating pipe to prevent the heat exchange liquid from entering the vacuum cavity through the communicating pipe.

[0022] In one or more embodiments of the present invention, a protective sleeve is provided in the storage cavity, and the protective sleeve wraps the cylinder to protect the cylinder from being affected by the heat exchange liquid.

[0023] In one or more embodiments of the present invention, the air outlet pipe is connected to a hollow pipe, and a rotating shaft is rotatably connected to the hollow pipe. One end of the rotating shaft is arranged in the storage cavity and in the heat exchange liquid, and the rotating shaft is used to install blades and stirring blades.

[0024] In one or more embodiments of the present invention, a blade is connected to one end of the rotating shaft located in the hollow pipe, and a stirring blade is connected to one end of the rotating shaft located in the heat exchange liquid. When the vacuum pump operates, the vacuum pump will suck the gas in the vacuum cavity through the suction pipe, making the vacuum cavity return to the vacuum state again. The gas sucked by the vacuum pump is discharged through the air outlet pipe and the hollow pipe. When the gas flows in the hollow pipe, the gas will impact the blade, causing the blade to drive the rotating shaft to rotate, and then the stirring blade can rotate in the heat exchange liquid. The rotating stirring blade can stir the heat exchange liquid to ensure the uniformity of the temperature of the heat exchange liquid.

[0025] Compared with the prior art, a constant temperature and humidity test chamber of the present invention can efficiently recover the heat energy in the constant temperature and humidity test chamber, effectively avoid the waste of heat energy resources in the constant temperature and humidity test chamber, and thus can greatly improve the utilization rate of heat energy resources. At the same time, it can also reduce the overall energy consumption when the constant temperature and humidity test chamber is used again. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a three-dimensional view of a constant temperature and humidity test chamber in an embodiment of the present invention;

[0028] Figure 2 Cross-sectional view of the first state of the heat recovery mechanism in an embodiment of the present invention;

[0029] Figure 3 is Figure 2 Schematic diagram of the structure at position A in

[0030] Figure 4 is Figure 2 Schematic diagram of the structure at position B in

[0031] Figure 5 Cross-sectional view of the second state of the heat recovery mechanism in an embodiment of the present invention;

[0032] Figure 6 is Figure 5 Schematic diagram of the structure at position C in

[0033] Figure 7 is Figure 5 Schematic diagram of the structure at position D in

[0034] Figure 8 is Figure 5 Schematic diagram of the structure at position E in

[0035] Figure 9 is Figure 5 Schematic diagram of the structure at position F in

[0036] Figure 10 Cross-sectional view of the third state of the heat recovery mechanism in an embodiment of the present invention;

[0037] Figure 11 is Figure 10 Schematic diagram of the structure at position G in

[0038] Figure 12 is Figure 10 Schematic diagram of the structure at position H in

[0039] Description of main reference numerals:

[0040] 1 - Main body of the test chamber, 101 - Test chamber, 2 - Heat recovery mechanism, 201 - Heat recovery box, 202 - Suction pipe, 203 - Air collecting hood, 204 - First control valve, 205 - Return air pipe, 206 - Second control valve, 207 - Connecting pipe, 208 - Air outlet, 3 - Vacuum pump, 301 - Exhaust pipe, 302 - Third control valve, 303 - Hollow pipe, 304 - Rotating shaft, 305 - Blade, 306 - Stirring blade, 4 - Air outlet auxiliary mechanism, 401 - Cylinder, 402 - Moving plate, 403 - Sealing gasket, 404 - Guide rod, 405 - Limiting block, 406 - Protective sleeve, 407 - Plug, 5 - Heat exchange liquid. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0042] As Figures 1 to 12 shown, a constant temperature and humidity test chamber in an embodiment of the present invention includes a test chamber main body 1, a heat recovery mechanism 2, a vacuum pump 3, and an air outlet auxiliary mechanism 4.

[0043] Among them, a test chamber 101 is provided in the test chamber main body 1. The product is placed in the test chamber 101, and then the test chamber main body 1 is controlled to operate to test the product.

[0044] Preferably, the test chamber main body 1 is a commercially available product and can be directly purchased and used.

[0045] As Figures 1 to 12 shown, the heat recovery mechanism 2 is installed on the side wall of the test chamber main body 1. The heat recovery mechanism 2 is used to efficiently recover the heat energy in the test chamber 101, effectively avoiding the waste of heat energy resources in the test chamber 101, thereby greatly improving the utilization rate of heat energy resources, and at the same time reducing the overall energy consumption when the test chamber main body 1 is used again.

[0046] Among them, the heat recovery mechanism 2 includes a heat recovery box 201. A vacuum chamber and an installation chamber are provided in the heat recovery box 201. An air suction pipe 202 and a return air pipe 205 are installed on the heat recovery box 201. The vacuum chamber is respectively connected to the test chamber 101 through the air suction pipe 202 and the return air pipe 205. When the first control valve 204 on the air suction pipe 202 is opened, the hot air in the test chamber 101 will quickly enter the vacuum chamber through the air suction pipe 202 under the negative pressure of the vacuum chamber to achieve efficient recovery of the heat energy in the test chamber 101.

[0047] When the second control valve 206 on the return air pipe 205 is opened, the hot air in the vacuum chamber will re-enter the test chamber 101 through the return air pipe 205 for the reuse of the heat energy resources in the vacuum chamber.

[0048] Preferably, a pressure sensor is provided in the vacuum chamber. The pressure sensor is electrically connected to the test chamber main body 1 to facilitate knowing the pressure situation in the vacuum chamber.

[0049] In addition, one end of the air suction pipe 202 located in the test chamber 101 is connected with a gas collecting hood 203, which can improve the efficiency of the hot air in the test chamber 101 entering the vacuum chamber through the air suction pipe 202.

[0050] Specifically, a first control valve 204 is installed on the suction pipe 202 to control the on-off of the suction pipe 202. A second control valve 206 is installed on the return pipe 205 to control the on-off of the second control valve 206.

[0051] Preferably, both the first control valve 204 and the second control valve 206 are electrically connected to the main body 1 of the test chamber, facilitating the staff to control the first control valve 204 and the second control valve 206 through the main body 1 of the test chamber.

[0052] As Figures 1 to 12 shown, a communicating pipe 207 is connected to the lower side wall of the storage chamber. The storage chamber is communicated with the vacuum chamber through the communicating pipe 207, enabling the heat exchange liquid 5 to flow between the storage chamber and the vacuum chamber.

[0053] Among them, an air outlet 208 is provided on the side wall of the heat recovery box 201. When the vacuum pump 3 operates, the vacuum pump 3 extracts the gas in the vacuum chamber through the suction pipe 301, making the vacuum chamber return to the vacuum state again. The gas extracted by the vacuum pump 3 is discharged from the heat recovery box 201 through the air outlet pipe, the hollow pipe 303 and the air outlet 208.

[0054] As Figures 1 to 12 shown, the vacuum pump 3 is installed in the installation cavity. The vacuum pump 3 is used to extract the gas in the vacuum chamber, making the vacuum chamber return to the vacuum state again, so as to recycle the hot air in the test chamber 101 by sucking it into the vacuum chamber, and then the heat energy in the test chamber 101 can be efficiently recovered, effectively avoiding the waste of heat energy resources in the test chamber 101, thereby greatly improving the utilization rate of heat energy resources, and at the same time reducing the overall energy consumption when the main body 1 of the test chamber is used again.

[0055] Among them, a suction pipe 301 and an air outlet pipe are connected to the vacuum pump 3. One end of the suction pipe 301 is arranged in the vacuum chamber, and the air outlet pipe corresponds to the air outlet 208. When the vacuum pump 3 operates, the vacuum pump 3 sucks the gas in the vacuum chamber through the suction pipe 301 and discharges it through the air outlet pipe, the hollow pipe 303 and the air outlet 208.

[0056] In addition, a third control valve 302 is installed on the suction pipe 301 to control the on-off of the suction pipe 301.

[0057] Preferably, the vacuum pump 3 and the third control valve 302 are also electrically connected to the main body 1 of the test chamber, facilitating the staff to control.

[0058] As Figures 1 to 12 shown, the air outlet pipe is connected to a hollow pipe 303. A rotating shaft 304 is rotatably connected to the hollow pipe 303. One end of the rotating shaft 304 is arranged in the storage chamber and is arranged in the heat exchange liquid 5. The rotating shaft 304 is used to install the blades 305 and the stirring blades 306.

[0059] One end of the rotating shaft 304 located inside the hollow tube 303 is connected with a blade 305, and one end of the rotating shaft 304 located inside the heat exchange liquid 5 is connected with a stirring blade 306. When the vacuum pump 3 operates, the vacuum pump 3 will suck the gas in the vacuum chamber through the suction pipe 301, making the vacuum chamber return to the vacuum state again. The gas sucked by the vacuum pump 3 is discharged through the air outlet pipe and the hollow tube 303. When the gas flows in the hollow tube 303, the gas will impact the blade 305, enabling the blade 305 to drive the rotating shaft 304 to rotate, and further enabling the stirring blade 306 to rotate in the heat exchange liquid 5. By using the rotating stirring blade 306, the heat exchange liquid 5 can be stirred to ensure the uniformity of the temperature of the heat exchange liquid 5.

[0060] As Figures 1 to 12 shown, an air outlet assisting mechanism 4 is installed inside the heat recovery box 201. The air outlet assisting mechanism 4 is used to change the space of the vacuum chamber, and thus can accelerate the rate at which the heat-carrying gas temporarily stored in the vacuum chamber re-enters the test chamber 101.

[0061] Among them, the air outlet assisting mechanism 4 includes a cylinder 401. The fixed end of the cylinder 401 is arranged outside the heat recovery box 201, and the free end of the cylinder 401 is arranged inside the vacuum chamber. The cylinder 401 is used to drive the moving plate 402 to move inside the vacuum chamber, so as to quickly discharge the heat-carrying gas temporarily stored in the vacuum chamber by using the movement of the moving plate 402.

[0062] In addition, one end of the cylinder 401 located inside the vacuum chamber is connected with a moving plate 402, and the moving plate 402 is slidably arranged inside the vacuum chamber. The heat-carrying gas temporarily stored in the vacuum chamber is quickly discharged by the movement of the moving plate 402 to improve the subsequent experimental efficiency.

[0063] Specifically, a sealing gasket 403 is connected to the side of the moving plate 402 away from the cylinder 401, and the sealing gasket 403 is made of rubber. The sealing gasket 403 can be used to increase the contact effect between the moving plate 402 and the side wall of the vacuum chamber, avoiding the leakage of the heat-carrying gas in the vacuum chamber.

[0064] In addition, a pair of guide rods 404 are installed on the side wall of the vacuum chamber. The moving plate 402 is slidably connected with the guide rods 404. The guide rods 404 can guide the movement of the moving plate 402 to avoid the moving plate 402 from shifting during movement. A limit block 405 is connected to the end of the guide rod 404. The limit block 405 is used to limit the moving distance of the moving plate 402. At the same time, when the sealing gasket 403 contacts the limit block 405, the heat exchange liquid 5 will not reduce the temperature of the gas in the vacuum chamber through the guide rod 404, so as to ensure the reuse effect of the heat-carrying gas in the vacuum chamber and avoid the heat exchange liquid 5 from excessively absorbing the thermal energy of the gas in the vacuum chamber.

[0065] Preferably, the upper guide rod 404 is made of plastic, and the lower guide rod 404 is made of heat-conducting metal, ensuring that one of the guide rods 404 has a certain strength and preventing the guide rod 404 from breaking.

[0066] As Figures 1 to 12 shown, a protective sleeve 406 is provided in the storage cavity. The protective sleeve 406 wraps around the cylinder 401 to protect the cylinder 401 from being affected by the heat exchange liquid 5.

[0067] Among them, a plug 407 is installed on the moving plate 402, and the plug 407 corresponds to the communication pipe 207. When the cylinder 401 contracts, the moving plate 402 contacts the side wall of the vacuum cavity. At this time, the plug 407 will block the communication pipe 207 to prevent the heat exchange liquid 5 from entering the vacuum cavity through the communication pipe 207.

[0068] As Figures 1 to 12 shown, a storage cavity is provided in the heat recovery box 201, and a heat exchange liquid 5 is provided in the storage cavity. When the heat-carrying gas is temporarily stored in the vacuum cavity, since one of the guide rods 404 is made of heat-conducting metal, the metal guide rod 404 will absorb a certain amount of heat. The heat exchange liquid 5 can absorb the heat absorbed by the metal guide rod 404 to prevent the heat on the guide rod 404 from being lost.

[0069] Preferably, the heat exchange liquid 5 is water.

[0070] Among them, a replenishing pipe and a drain pipe are provided on the side wall of the heat recovery box 201. The replenishing pipe and the drain pipe are both communicated with the storage cavity for replenishing and replacing the heat exchange liquid 5.

[0071] During specific use, place the product into the test chamber main body 1, and run the test chamber main body 1 to perform relevant operations on the product.

[0072] When the product test is completed, there is a certain amount of thermal energy in the test chamber 101. To avoid wasting the thermal energy resources in the test chamber 101, open the first control valve 204 on the suction pipe 202. Since the vacuum cavity is in a negative pressure state, the hot gas in the test chamber 101 will quickly enter the vacuum cavity for storage through the suction pipe 202, that is Figure 2 the gas flow direction shown. When the thermal energy in the test chamber 101 is completely absorbed, close the first control valve 204 and take out the product in the test chamber 101.

[0073] When it is necessary to conduct experiments on other products, open the second control valve 206 on the return air pipe 205. The heated gas temporarily stored in the vacuum chamber will diffuse into the test chamber 101 through the return air pipe 205 for the reuse of the heated gas. To increase the rate at which the heated gas in the vacuum chamber enters the test chamber 101, control the cylinder 401 to extend. The cylinder 401 drives the moving plate 402 to move within the vacuum chamber to reduce the overall volume of the vacuum chamber. At this time, the heated gas temporarily stored in the vacuum chamber will be quickly pushed by the moving plate 402 and enter the test chamber 101 through the return air pipe 205.

[0074] When the moving plate 402 is far from the side wall of the vacuum chamber, the plug 407 disengages from blocking the communication pipe 207, and the heat exchange liquid 5 in the storage chamber will enter the vacuum chamber through the communication pipe 207. Since the lower guide rod 404 is made of heat-conducting metal, when the heated gas is temporarily stored in the vacuum chamber, the metal guide rod 404 will also absorb a certain amount of heat. The heat exchange liquid 5 entering the vacuum chamber can absorb the heat absorbed by the metal guide rod 404 to avoid heat loss from the guide rod 404, that is Figure 7 the state shown.

[0075] When the gas in the vacuum chamber is discharged, close the second control valve 206 and control the cylinder 401 to contract. The cylinder 401 drives the moving plate 402 to squeeze the heat exchange liquid 5 in the vacuum chamber, so that the heat exchange liquid 5 in the vacuum chamber flows back into the storage chamber through the communication pipe 207. When the moving plate 402 contacts the side wall of the vacuum chamber, the plug 407 will block the communication pipe 207. At this time, it is possible to prevent the heat exchange liquid 5 from entering the vacuum chamber through the communication pipe 207.

[0076] Operate the vacuum pump 3 and simultaneously open the third control valve 302 on the air extraction pipe 301. When the vacuum pump 3 operates, the vacuum pump 3 sucks the gas in the vacuum chamber through the air extraction pipe 301, making the vacuum chamber return to a vacuum state. The gas sucked by the vacuum pump 3 is discharged through the air outlet pipe and the hollow pipe 303. When the gas flows in the hollow pipe 303, the gas will impact the blade 305, causing the blade 305 to drive the rotating shaft 304 to rotate. As a result, the stirring blade 306 can rotate in the heat exchange liquid 5, and the rotating stirring blade 306 can be used to stir the heat exchange liquid 5 to ensure the temperature uniformity of the heat exchange liquid 5. Finally, the gas is discharged through the air outlet 208. When the vacuum chamber returns to a vacuum state, turn off the vacuum pump 3 and the third control valve 302, and operate the main body 1 of the test chamber to conduct relevant tests on the product.

[0077] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0078] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A constant humidity and constant temperature test chamber, characterized in that: include: A test box body, wherein a test chamber is provided in the test box body; A heat recovery mechanism is installed on the side wall of the test box body, the heat recovery mechanism includes a heat recovery box, a vacuum chamber and an installation chamber are provided in the heat recovery box, an air intake pipe and an air return pipe are installed on the heat recovery box, one end of the air intake pipe located in the test chamber is connected to a gas collecting hood, the vacuum chamber is connected to the test chamber through the air intake pipe and the air return pipe, respectively, a first control valve is installed on the air intake pipe, a second control valve is installed on the air return pipe, and an air outlet is provided on the side wall of the heat recovery box; A vacuum pump is installed in the installation cavity. The vacuum pump is connected to an exhaust pipe and an exhaust pipe. One end of the exhaust pipe is arranged in the vacuum cavity. A third control valve is installed on the exhaust pipe. The exhaust pipe corresponds to the exhaust port.

2. A constant humidity and constant temperature test box according to claim 1, characterized in that: An air outlet auxiliary mechanism is installed in the heat recovery box, and the air outlet auxiliary mechanism includes a cylinder, a fixed end of the cylinder is arranged outside the heat recovery box, and a free end of the cylinder is arranged in the vacuum chamber.

3. A constant humidity and constant temperature test box according to claim 2, characterized in that: One end of the cylinder located in the vacuum chamber is connected to a moving plate, the moving plate is slidably arranged in the vacuum chamber, and a sealing gasket is connected to a side of the moving plate away from the cylinder, and the sealing gasket is made of rubber.

4. A constant humidity and constant temperature test box according to claim 3, characterized in that: A pair of guide rods are installed on the side wall of the vacuum chamber, the ends of the guide rods are connected to limit blocks, the movable plate is slidably connected to the guide rods, the upper guide rods are made of plastic material, and the lower guide rods are made of heat-conducting metal material.

5. A constant humidity and constant temperature test box according to claim 4, characterized in that: A storage cavity is provided in the heat recovery box, and a heat exchange liquid is provided in the storage cavity.

6. A constant humidity and constant temperature test box according to claim 5, characterized in that: The lower side wall of the storage cavity is connected with a connecting pipe, and the storage cavity is connected with the vacuum cavity through the connecting pipe.

7. A constant humidity and constant temperature test box according to claim 6, characterized in that: A plug is installed on the movable plate, and the plug corresponds to the connecting pipe.

8. A constant humidity and constant temperature test box according to claim 7, characterized in that: A protective sleeve is arranged in the storage cavity, and the protective sleeve is wrapped around the cylinder.

9. A constant humidity and constant temperature test box according to claim 8, characterized in that: The air outlet pipe is connected to a hollow tube, and a rotating shaft is rotatably connected to the hollow tube. One end of the rotating shaft is arranged in the storage cavity and in the heat exchange liquid.

10. A constant humidity and constant temperature test box according to claim 9, characterized in that: One end of the rotating shaft located in the hollow tube is connected to a blade, and one end of the rotating shaft located in the heat exchange fluid is connected to a stirring blade.

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