Constant humidity constant temperature test chamber

Abstract

The application relates to a constant-humidity constant-temperature test box, which comprises a test box main body, a heat recovery mechanism and a vacuum pump; the test box main body is internally provided with a test cavity; the heat recovery mechanism is installed on the side wall of the test box main body and comprises a heat recovery box; the heat recovery box is internally provided with a vacuum cavity and a mounting cavity; a suction pipe and a return pipe are installed on the heat recovery box; a gas collecting cover is connected to one end of the suction pipe in the test cavity; the vacuum cavity is connected with the test cavity through the suction pipe and the return pipe; a first control valve is installed on the suction pipe; a second control valve is installed on the return pipe; and an air outlet is arranged on the side wall of the heat recovery box. The application can efficiently recover the heat energy in the constant-humidity constant-temperature test box, can avoid the waste of the heat energy resource in the constant-humidity constant-temperature test box, can greatly improve the utilization rate of the heat energy resource, and can reduce the overall energy consumption of the constant-humidity constant-temperature test box when the constant-humidity constant-temperature test box is used again.

Description

Technical Field

[0001] This invention belongs to the field of test chamber technology, specifically relating to a constant humidity and temperature test chamber. Background Technology

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

[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 aging test chambers, and ozone aging test chambers. Among them, constant temperature and humidity test chambers simulate the performance of products under different environments by controlling temperature and humidity. However, existing constant temperature and humidity test chambers are not energy-efficient or environmentally friendly. They cannot efficiently recover heat energy inside the chamber, causing heat energy to easily be lost, resulting in wasted thermal resources and increased energy consumption when the chamber is reused.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a constant humidity and temperature test chamber.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

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

[0007] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

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

[0009] The test chamber is equipped with a test cavity inside its main body;

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

[0011] The vacuum pump is installed in the mounting cavity. The vacuum pump is connected to a suction pipe and a discharge pipe. One end of the suction pipe is located in the vacuum cavity. A third control valve is installed on the suction pipe. The discharge pipe corresponds to the discharge port.

[0012] In one or more embodiments of the present invention, a gas exhaust assist mechanism is installed inside the heat recovery box. The gas exhaust assist mechanism is used to change the space of the vacuum chamber, thereby enabling the rapid discharge of the gas with heat temporarily stored in the vacuum chamber.

[0013] The gas exhaust auxiliary mechanism includes a cylinder. The fixed end of the cylinder is located outside the heat recovery box, and the free end of the cylinder is located inside the vacuum chamber. The cylinder is used to drive the moving plate to move within the vacuum chamber so as to quickly exhaust the gas containing heat temporarily stored in the vacuum chamber by using the movement of the moving plate.

[0014] In one or more embodiments of the present invention, a movable plate is connected to one end of the cylinder located in the vacuum chamber. The movable plate is slidably disposed in the vacuum chamber. The movement of the movable plate can quickly discharge the gas temporarily stored in the vacuum chamber with heat, so as to improve the efficiency of subsequent experiments.

[0015] A sealing gasket is connected to the side of the movable plate away from the cylinder. The sealing gasket is made of rubber. The sealing gasket can increase the contact effect between the movable plate and the side wall of the vacuum chamber, and prevent the leakage of hot gas in the vacuum chamber.

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

[0017] The guide rod is connected to a limit block at its end, which is used to limit the movement distance of the moving plate.

[0018] The movable plate is slidably connected to the guide rod. 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 preventing the guide rod from breaking.

[0019] In one or more embodiments of the present invention, the heat recovery box is provided with a storage cavity, and the storage cavity is provided with a heat exchange fluid. When the gas carrying heat is temporarily stored in the vacuum cavity, since one of the guide rods is made of a thermally conductive metal material, the metal guide rod will absorb a certain amount of heat. The heat exchange fluid can absorb the heat absorbed by the metal guide rod, thus preventing the heat loss from the guide rod.

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

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

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

[0023] In one or more embodiments of the present invention, 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 located inside the storage cavity and inside the heat exchange liquid. The rotating shaft is used to install blades and stirring blades.

[0024] In one or more embodiments of the present invention, one end of the rotating shaft located inside the hollow tube is connected to a blade, and the other end of the rotating shaft located inside the heat exchange liquid is connected to a stirring blade. When the vacuum pump is running, the vacuum pump will draw gas from the vacuum chamber through the suction pipe, so that the vacuum chamber becomes a vacuum state again. The gas drawn by the vacuum pump is discharged through the exhaust pipe and the hollow tube. When the gas flows in the hollow tube, the gas will impact the blade, so that the blade can drive the rotating shaft to rotate, thereby allowing the stirring blade to rotate in the heat exchange liquid. The rotating stirring blade can stir the heat exchange liquid and ensure the uniformity of the heat exchange liquid temperature.

[0025] Compared with the prior art, the constant temperature and humidity test chamber of the present invention can efficiently recover the heat energy inside the constant temperature and humidity test chamber, effectively avoid the waste of heat energy resources inside the constant temperature and humidity test chamber, thereby greatly improving the utilization rate of heat energy resources, and at the same time reducing the overall energy consumption when the constant temperature and humidity test chamber is reused. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a perspective view of a constant humidity and temperature test chamber according to an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the heat recovery mechanism in a first state according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 Schematic diagram of the structure at point A in the middle;

[0030] Figure 4 for Figure 2 Schematic diagram of the structure at point B;

[0031] Figure 5 This is a cross-sectional view of the heat recovery mechanism in a second state according to an embodiment of the present invention;

[0032] Figure 6 for Figure 5 Schematic diagram of the structure at point C;

[0033] Figure 7 for Figure 5 Schematic diagram of the structure at point D;

[0034] Figure 8 for Figure 5 Schematic diagram of the structure at point E in the middle;

[0035] Figure 9 for Figure 5 Schematic diagram of the structure at point F;

[0036] Figure 10 This is a cross-sectional view of the heat recovery mechanism in a third state according to an embodiment of the present invention;

[0037] Figure 11 for Figure 10 Schematic diagram of the structure at point G in the middle;

[0038] Figure 12 for Figure 10 Schematic diagram of the structure at point H.

[0039] Explanation of key figure labels:

[0040] 1-Test chamber body, 101-Test chamber, 2-Heat recovery mechanism, 201-Heat recovery box, 202-Suction pipe, 203-Gas collection hood, 204-First control valve, 205-Return pipe, 206-Second control valve, 207-Connecting pipe, 208-Gas outlet, 3-Vacuum pump, 301-Suction pipe, 302-Third control valve, 303-Hollow tube, 304-Rotating shaft, 305-Blade, 306-Stirring blade, 4-Gas 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 fluid. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

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

[0043] The test chamber 1 has a test cavity 101 inside. The product is placed in the test cavity 101 and the test chamber 1 is controlled to run to test the product.

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

[0045] like Figures 1 to 12 As shown, the heat recovery mechanism 2 is installed on the side wall of the test chamber body 1. The heat recovery mechanism 2 is used to efficiently recover the heat energy in the test chamber 101, effectively avoid the waste of heat energy resources in the test chamber 101, and thus greatly improve the utilization rate of heat energy resources. At the same time, it can also reduce the overall energy consumption when the test chamber body 1 is reused.

[0046] The heat recovery mechanism 2 includes a heat recovery box 201, which contains a vacuum chamber and an installation chamber. A suction pipe 202 and a return pipe 205 are installed on the heat recovery box 201. The vacuum chamber is connected to the test chamber 101 via the suction pipe 202 and the return pipe 205. When the first control valve 204 on the suction pipe 202 is opened, the hot gas in the test chamber 101 will quickly enter the vacuum chamber through the suction pipe 202 under the negative pressure of the vacuum chamber, thereby achieving efficient recovery of heat energy within the test chamber 101.

[0047] When the second control valve 206 on the return gas pipe 205 is opened, the hot gas in the vacuum chamber will re-enter the test chamber 101 through the return gas pipe 205 so as to reuse the thermal energy resources in the vacuum chamber.

[0048] Preferably, a pressure sensor is installed inside the vacuum chamber, and the pressure sensor is electrically connected to the main body 1 of the test chamber to facilitate knowing the pressure inside the vacuum chamber.

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

[0050] Specifically, a first control valve 204 is installed on the intake pipe 202 to control the opening and closing of the intake pipe 202. A second control valve 206 is installed on the return pipe 205 to control the opening and closing 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 test chamber body 1, so that the staff can control the first control valve 204 and the second control valve 206 through the test chamber body 1.

[0052] like Figures 1 to 12 As shown, a connecting pipe 207 is connected to the lower side wall of the storage cavity, and the storage cavity is connected to the vacuum cavity through the connecting pipe 207, so that the heat exchange liquid 5 can flow in the storage cavity and the vacuum cavity.

[0053] The heat recovery box 201 has an outlet 208 on its side wall. When the vacuum pump 3 is running, the vacuum pump 3 draws gas from the vacuum chamber through the suction pipe 301, so that the vacuum chamber becomes a vacuum state again. The gas drawn by the vacuum pump 3 is discharged from the heat recovery box 201 through the outlet pipe, the hollow pipe 303 and the outlet 208.

[0054] like Figures 1 to 12 As shown, the vacuum pump 3 is installed in the mounting cavity. The vacuum pump 3 is used to extract the gas in the vacuum cavity, so that the vacuum cavity becomes a vacuum state again, so that the vacuum cavity can be recycled to extract the hot gas in the test chamber 101. In this way, 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 also reducing the overall energy consumption when the test chamber body 1 is reused.

[0055] The vacuum pump 3 is connected to a suction pipe 301 and a discharge pipe. One end of the suction pipe 301 is located inside the vacuum chamber, and the discharge pipe corresponds to the discharge port 208. When the vacuum pump 3 is running, it draws gas from the vacuum chamber through the suction pipe 301 and discharges it through the discharge pipe, the hollow pipe 303, and the discharge port 208.

[0056] In addition, a third control valve 302 is installed on the extraction pipe 301 to control the opening and closing of the extraction pipe 301.

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

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

[0059] The rotating shaft 304, located inside the hollow tube 303, is connected to a blade 305 at one end, and to a stirring blade 306 at the other end, located inside the heat exchange liquid 5. When the vacuum pump 3 operates, it draws gas from the vacuum chamber through the extraction pipe 301, restoring the vacuum chamber to a vacuum state. The gas drawn in by the vacuum pump 3 is then discharged through the outlet pipe and the hollow tube 303. As the gas flows within the hollow tube 303, it impacts the blade 305, causing the blade 305 to rotate the rotating shaft 304. This, in turn, causes the stirring blade 306 to rotate within the heat exchange liquid 5, thus agitating the heat exchange liquid 5 and ensuring its temperature uniformity.

[0060] like Figures 1 to 12 As shown, the heat recovery box 201 is equipped with an exhaust auxiliary mechanism 4, which is used to change the space of the vacuum chamber, thereby accelerating the rate at which the gas temporarily stored in the vacuum chamber with heat re-enters the test chamber 101.

[0061] The gas exhaust auxiliary mechanism 4 includes a cylinder 401. The fixed end of the cylinder 401 is located outside the heat recovery box 201, and the free end of the cylinder 401 is located inside the vacuum chamber. The cylinder 401 is used to drive the moving plate 402 to move within the vacuum chamber, so as to quickly exhaust the temporarily stored hot gas in the vacuum chamber by using the movement of the moving plate 402.

[0062] In addition, a movable plate 402 is connected to one end of the cylinder 401 located inside the vacuum chamber. The movable plate 402 is slidably disposed inside the vacuum chamber. The movement of the movable plate 402 quickly discharges the temporarily stored hot gas in the vacuum chamber, thereby improving the efficiency of subsequent experiments.

[0063] Specifically, a sealing gasket 403, made of rubber, is connected to the side of the movable plate 402 away from the cylinder 401. The sealing gasket 403 increases the contact effect between the movable plate 402 and the side wall of the vacuum chamber, preventing the leakage of hot gas inside 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 to the guide rods 404. The guide rods 404 can guide the movement of the moving plate 402 and prevent the moving plate 402 from deviating 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 movement distance of the moving plate 402. At the same time, when the sealing gasket 403 contacts the limit block 405, the heat exchange fluid 5 will not reduce the temperature of the gas in the vacuum chamber through the guide rods 404, so as to ensure the reuse effect of the hot gas in the vacuum chamber and avoid the heat exchange fluid 5 from excessively absorbing the heat 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] like Figures 1 to 12 As shown, a protective sleeve 406 is provided inside the storage cavity. The protective sleeve 406 wraps around the cylinder 401 to protect the cylinder 401 and prevent the cylinder 401 from being affected by the heat exchange fluid 5.

[0067] The movable plate 402 is equipped with a plug 407, which corresponds to the connecting pipe 207. When the cylinder 401 retracts, the movable plate 402 contacts the side wall of the vacuum chamber. At this time, the plug 407 will block the connecting pipe 207 to prevent the heat exchange liquid 5 from entering the vacuum chamber through the connecting pipe 207.

[0068] like Figures 1 to 12 As shown, the heat recovery box 201 has a storage chamber containing a heat exchange fluid 5. When the gas carrying heat is temporarily stored in the vacuum chamber, one of the guide rods 404 is made of a thermally conductive metal. Therefore, the metal guide rod 404 will absorb a certain amount of heat. The heat exchange fluid 5 can absorb the heat absorbed by the metal guide rod 404, preventing heat loss from the guide rod 404.

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

[0070] The heat recovery box 201 has a replenishment pipe and a drain pipe on its side wall. Both the replenishment pipe and the drain pipe are connected to the storage chamber and are used to replenish and replace the heat exchange fluid 5.

[0071] In practical use, place the product inside the main body 1 of the test chamber, and run the main body 1 of the test chamber to perform relevant operations on the product.

[0072] After the product test is completed, a certain amount of heat energy remains in the test chamber 101. To avoid wasting this heat energy, the first control valve 204 on the suction pipe 202 is opened. Because the vacuum chamber is under negative pressure, the hot gas in the test chamber 101 will quickly enter the vacuum chamber through the suction pipe 202 for storage. Figure 2 The gas flow direction is shown. After the heat energy in the test chamber 101 has been completely absorbed, close the first control valve 204 and remove the product from the test chamber 101.

[0073] When experiments are needed on other products, the second control valve 206 on the return gas pipe 205 is opened. The hot gas temporarily stored in the vacuum chamber diffuses into the test chamber 101 through the return gas pipe 205, allowing for the reuse of the hot gas. To increase the rate at which the hot gas enters the test chamber 101 from the vacuum chamber, the cylinder 401 is extended. The cylinder 401 drives the moving plate 402 to move within the vacuum chamber, reducing its overall volume. At this time, the hot gas temporarily stored in the vacuum chamber is rapidly pushed into the test chamber 101 through the return gas pipe 205 by the moving plate 402.

[0074] When the moving plate 402 moves away from the side wall of the vacuum chamber, the plug 407 disengages from the connecting pipe 207, and the heat exchange fluid 5 in the storage chamber enters the vacuum chamber through the connecting pipe 207. Since the lower guide rod 404 is made of a thermally conductive metal, it will absorb some heat when hot gas is temporarily stored in the vacuum chamber. The heat exchange fluid 5 entering the vacuum chamber can absorb the heat absorbed by the metal guide rod 404, preventing heat loss from the guide rod 404. Figure 7 The state shown.

[0075] When the gas in the vacuum chamber is discharged, the second control valve 206 is closed, and the control cylinder 401 contracts. The cylinder 401 drives the moving plate 402 to squeeze the heat exchange liquid 5 in the vacuum chamber, causing the heat exchange liquid 5 in the vacuum chamber to flow back into the storage chamber through the connecting pipe 207. When the moving plate 402 contacts the side wall of the vacuum chamber, the plug 407 will block the connecting pipe 207, thus preventing the heat exchange liquid 5 from entering the vacuum chamber through the connecting pipe 207.

[0076] Operate vacuum pump 3 and simultaneously open the third control valve 302 on the suction pipe 301. When vacuum pump 3 is running, it draws gas from the vacuum chamber through suction pipe 301, restoring the vacuum chamber to a vacuum state. The gas drawn in by vacuum pump 3 is discharged through the outlet pipe and hollow tube 303. As the gas flows within hollow tube 303, it impacts blades 305, causing blades 305 to drive the rotating shaft 304 to rotate. This, in turn, causes stirring blades 306 to rotate within the heat exchange liquid 5, agitating the heat exchange liquid 5 and ensuring temperature uniformity. Finally, the gas is discharged through outlet 208. When the vacuum chamber returns to a vacuum state, close vacuum pump 3 and the third control valve 302, and then operate the main body of the test chamber 1 to conduct relevant tests on the product.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 temperature test chamber, characterized in that, include: The main body of the test chamber, wherein a test cavity is provided inside the main body of the test chamber; A heat recovery mechanism is installed on the side wall of the main body of the test chamber. The heat recovery mechanism includes a heat recovery box, which contains a vacuum chamber and an installation chamber. An intake pipe and a return pipe are installed on the heat recovery box. One end of the intake pipe, located inside the test chamber, is connected to a gas collection hood. The vacuum chamber is connected to the test chamber via the intake pipe and the return pipe. A first control valve is installed on the intake pipe, and a second control valve is installed on the return pipe. An outlet is provided on the side wall of the heat recovery box. An outlet auxiliary mechanism is installed inside the heat recovery box. The outlet auxiliary mechanism includes a cylinder. The fixed end of the cylinder is located outside the heat recovery box, and the free end of the cylinder is located inside the vacuum chamber. A movable plate is connected to one end of the cylinder located inside the vacuum chamber. The movable plate is slidably disposed within the vacuum chamber. A sealing gasket made of rubber is connected to the side of the movable plate away from the cylinder. A pair of guide rods are installed on the side wall of the vacuum chamber. Limit blocks are connected to the ends of the guide rods. The movable plate is slidably connected to the guide rods. The upper guide rod is made of plastic, and the lower guide rod is made of thermally conductive metal. A storage chamber is provided inside the heat recovery box. A heat exchange fluid is provided in the storage chamber. A connecting pipe is connected to the lower side wall of the storage chamber. The storage chamber is connected to the vacuum chamber through the connecting pipe. A plug is installed on the movable plate, and the plug corresponds to the connecting pipe. A vacuum pump is installed in the mounting cavity. The vacuum pump is connected to a suction pipe and a discharge pipe. One end of the suction pipe is located in the vacuum cavity. A third control valve is installed on the suction pipe. The discharge pipe corresponds to the discharge port.

2. The constant humidity and temperature test chamber according to claim 1, characterized in that, The storage cavity is equipped with a protective sleeve, which covers the cylinder.

3. A constant humidity and temperature test chamber according to claim 2, 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 located inside the storage cavity and inside the heat exchange fluid.

4. A constant humidity and temperature test chamber according to claim 3, characterized in that, The rotating shaft is connected to a blade at one end inside the hollow tube, and to a stirring blade at the other end inside the heat exchange liquid.

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