An industrial computer with controllable internal humidity

Abstract

The application discloses an inner humidity controllable industrial computer, and relates to the technical field of industrial computer humidity control, which comprises an installation plate fixedly installed in the inside of a body, an air outlet and an air inlet are formed in the outside of the body, and a heat dissipation fan is arranged at the upper end of the installation plate, and a dust screen is arranged in the air inlet. The inner humidity controllable industrial computer realizes two-way intelligent humidity control in the industrial computer by means of a single power source linkage structure, linkage opening and closing of the air duct of the lifting horizontal plate, cooperation of the elastic resin moisture absorption block in adsorbing moisture and extruding water, and synchronous completion of the ventilation, heat dissipation and dehumidification operations. The inclined control groove and the limiting sliding structure ensure uniform extrusion and smooth resetting of the moisture absorption block, prevent the structure from being damaged and the moisture absorption from being ineffective, and the drainage channel can be opened in advance and timely blocked, which not only ensures that the extruded accumulated water is quickly discharged without residual moisture return, but also blocks the reverse flow of external moisture in a low-humidity environment, greatly improves the humidity control stability and service life of the equipment, and is suitable for long-term unattended operation of the industrial scene.

Description

Technical Field

[0001] This invention relates to the field of industrial computer humidity control technology, specifically to an industrial computer with controllable internal humidity. Background Technology

[0002] The internal components, circuit boards, and metal structures of industrial control computers are highly sensitive to the humidity of the cavity, and there is a direct negative correlation between the two. When the internal humidity is too high, moisture in the air can cause short circuits and leakage at the PCB board, chip pins, and other locations. On the other hand, if the internal humidity of the industrial control computer is dry for a long time and the humidity is below 30%RH, static electricity can easily accumulate due to friction, which can damage precision chips and storage components. Therefore, the suitable stable humidity range for industrial control computers is 40% to 60% RH. Exceeding this range will cause potential failures and make it difficult to ensure long-term stable operation in industrial settings.

[0003] Patent application publication number CN221149273U discloses an industrial control computer. Through a support plate, a protective plate, and a flip cover, various exposed interfaces, connectors, and operation keys on the industrial control computer can be protected, so that the industrial control computer will not be damaged by collisions with the interfaces, connectors, and operation keys during transportation and movement, thereby affecting the user's use. When the industrial control computer is placed on the ground, the sliding support plate and the indexing pin are used to position the industrial control computer body to raise and position it, so that the user can operate the industrial control computer at a more comfortable height. The flip cover can also be used as a desktop.

[0004] Patent application CN212229569U discloses a multifunctional network information security industrial control computer. Two limit plates can be adjusted in position via a return spring and a telescopic support, allowing for the fixation of industrial control computers of different sizes. Shock absorbers designed on the mounting plate mitigate the impact of vibration on the industrial control computer. A temperature sensor monitors the temperature inside the enclosure in real time. When the temperature is high, it transmits a signal to the controller, which then activates a cooling unit to lower the internal temperature, ensuring the temperature inside the enclosure remains within a certain range during computer operation. A humidity sensor monitors the humidity inside the enclosure in real time. When the humidity is high, it transmits a signal to the controller, which then activates a first air pump to draw air from inside the enclosure into a dehumidifier for dehumidification and drying.

[0005] Patent application publication number CN219145988U discloses a multi-interface compatible industrial control computer. By setting a sealed heat dissipation component structure on both sides of the industrial control housing, the sealed heat dissipation component is used to heat the ventilation fans on both sides of the industrial control housing. Under the monitoring of temperature and humidity sensors inside the sealed heat dissipation component, the humidity of the incoming air is monitored and the start of the sealed heat dissipation component is automatically controlled. This allows for automatic control of the internal components of the industrial control housing and prevents moisture from entering, thereby improving the protection effect of the industrial control computer.

[0006] In the aforementioned patent, the industrial control computer can automatically control the internal components of the industrial control housing and prevent moisture from entering. However, in actual use, the industrial control computer still has the following problems: When the external humidity of the industrial control computer is high, this method, which only blocks the entry of external moisture or directly extracts internal air to remove moisture, cannot effectively recover the moisture that has already entered the machine body, nor can it quickly adjust the internal humidity to a suitable range. At the same time, when ventilation and dehumidification are blocked, the heat generated by the operation of the industrial control computer cannot be discharged in time, which can easily cause new problems such as excessive internal temperature. If ventilation and heat dissipation are maintained for a long time, it will lead to the continuous entry of high-humidity external air, making it impossible to stably maintain a suitable humidity inside the machine body. Moreover, most of these dehumidification structures cannot perform online dehydration and regeneration of the moisture-absorbing material. It is necessary to periodically disassemble the machine body to replace or dry the moisture-absorbing material, which is a cumbersome maintenance process and cannot meet the needs of long-term unattended and stable operation of industrial control computers in industrial scenarios.

[0007] To address the aforementioned issues, there is an urgent need for innovative design based on the existing industrial control computer structure. Summary of the Invention

[0008] The purpose of this invention is to provide an industrial computer with controllable internal humidity to solve the multiple drawbacks of existing industrial computer moisture-proof structures mentioned in the background art, such as difficulty in quickly removing existing moisture inside the machine by simply isolating or venting moisture; high humidity air is easily introduced if ventilation is continuous, and heat accumulation and temperature rise when dehumidifying in a closed manner; the moisture-absorbing material cannot be regenerated online and requires manual disassembly and maintenance, which is not suitable for long-term unattended operation in industrial settings.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an industrial computer with controllable internal humidity, comprising an installation plate fixedly installed inside the machine body, and an air outlet and an air inlet opened on the outside of the machine body, and a cooling fan is provided at the upper end of the installation plate, while a dustproof net is provided inside the air inlet; The machine body is equipped with a dehumidification structure inside, which can control the humidity inside the machine body. The machine body is also equipped with an opening and closing structure, which can control the closure of the air outlet and the air inlet.

[0010] Preferably, the opening and closing structure includes a dehumidification frame, which is fixedly installed inside the machine body, and two sets of miniature push rods are fixedly installed on the outside of the dehumidification frame, while a lifting cross plate is fixedly installed on the upper end of the miniature push rods.

[0011] Preferably, a connecting rod is fixedly installed at the lower end of the lifting horizontal plate, and two sets of motion grooves are opened inside the driving horizontal plate fixedly installed at the lower end of the connecting rod. Sliding blocks are slidably installed inside the motion grooves. Rollers rotatably installed on the outer side of the sliding blocks are located at the upper and lower ends of the driving horizontal plate, and a driving shaft is rotatably installed at the lower end of the sliding blocks.

[0012] Preferably, the opening and closing structure further includes a sealing plate, which is rotatably installed inside the machine body, and the connecting piece fixedly installed on the outside of the sealing plate is located on the outside of the drive shaft. At the same time, the sealing plate is located on the side of the air outlet and air inlet close to the inside of the machine body.

[0013] Preferably, the dehumidification structure includes a dehumidification frame and a pressing plate, with the pressing plate fixedly installed at the lower end of the lifting horizontal plate, and dehumidification holes are equidistantly provided inside the dehumidification frame.

[0014] Preferably, a pressing rod is fixedly installed at the lower end of the pressing plate, and a receiving block is fixedly installed at the lower end of the pressing rod. A receiving hole plate slidably installed on the outside of the pressing rod is located at the upper end of the receiving block, and a resin elastic moisture-absorbing block disposed between the receiving hole plate and the pressing plate is located on the outside of the pressing rod.

[0015] Preferably, a drain pipe is fixedly installed at the lower end of the dehumidification frame, and a fixing block is fixedly installed inside the drain pipe. A sliding rod is slidably installed inside the fixing block. A sealing element fixedly installed at the upper end of the sliding rod is in close contact with the inside of the drain pipe, and a return spring sleeved on the outside of the sliding rod is located between the sealing element and the fixing block.

[0016] Preferably, a limiting groove plate is fixedly installed at the lower end of the pressing plate, and a lifting plate slidably installed between the left and right sets of limiting groove plates passes through the resin elastic moisture-absorbing block, and the four sets of lifting plates are staggered vertically.

[0017] Preferably, two sets of control plates are rotatably mounted on the outer side of the pressing plate, and a control shaft is rotatably mounted on the outer side of the control plate. The end of the control shaft away from the control plate is located inside the control slot opened inside the dehumidification frame, and the distance between the upper ends of the left and right sets of control slots is smaller than the distance between their lower ends.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses the movement of the lifting plate to simultaneously rotate the sealing plate and squeeze the resin elastic moisture-absorbing block. When the humidity and temperature inside the machine are too high, the air outlet and air inlet are opened to ensure air circulation inside the machine. At the same time, the resin elastic moisture-absorbing block absorbs excess moisture and the squeezed water is discharged through the drain pipe. This achieves both the external discharge of internal moisture and the adsorption of water vapor through the moisture-absorbing structure, as well as heat dissipation inside the machine. The triple action stably controls the humidity inside the machine, strengthens the structural linkage, eliminates the need for multiple sets of drive components, and reduces the energy consumption and structural complexity of the device.

[0019] 2. When the internal humidity of the machine is too low, the lifting plate moves in the opposite direction, causing the sealing plate to rotate, completely closing the air outlet and air inlet, blocking the exchange of humid air between the inside and outside of the machine. At the same time, it releases the pressure on the resin elastic moisture-absorbing block, allowing the resin elastic moisture-absorbing block to release a small amount of pre-stored moisture, slowly increasing the internal humidity of the machine and maintaining the humidity stably within a suitable range. This integrated system achieves bidirectional regulation of humidity levels, improving humidity control efficiency. Moreover, the overall structure has strong linkage; the opening and closing mechanism simultaneously completes the switching of the dehumidification structure's working state. A single power source can realize the entire humidity control process, reducing the investment in device components, lowering the overall manufacturing cost and operating energy consumption of the industrial control computer, and adapting to the needs of long-term stable operation in industrial scenarios.

[0020] 3. Furthermore, the present invention, through the inclined control groove and control shaft, can push the control plate to rotate around the shaft when the pressing plate moves downward, so that the control plate and the extrusion plate can thoroughly squeeze and drain the resin elastic moisture-absorbing block. The control plate is in an inclined state to prevent water droplets from falling on the outside of the dehumidification frame. At the same time, the lifting plate slides inside the limiting groove plate, which helps the resin elastic moisture-absorbing block to reset and avoids the resin elastic moisture-absorbing block shrinking and condensing. This ensures that the resin elastic moisture-absorbing block is subjected to uniform force when pressed, avoids excessive local compression that could damage the moisture-absorbing block structure, and improves the service life and moisture absorption uniformity of the dehumidification structure.

[0021] 4. Furthermore, as the receiving block moves downward with the pressing plate, it can pre-press the sliding rod, causing the seal to open the drainage channel of the drain pipe in advance. This allows the squeezed water to be smoothly discharged to the outside of the machine through the drain pipe, without remaining inside the dehumidification frame. This prevents water accumulation and secondary dampness, further improving the stability of the dehumidification operation.

[0022] 5. Furthermore, when the machine body is in a low humidity environment for a long time, the miniature push rod drives the lifting horizontal plate to move up, the receiving block disengages from the sliding rod, and the seal re-seals the drain pipe under the action of the return spring, preventing external moisture from flowing back into the machine body through the drain pipe, further improving the device's ability to control internal humidity and ensuring stability under low humidity conditions. Attached Figure Description

[0023] Figure 1 This is a top-view three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention viewed from below; Figure 3 This is a top-view three-dimensional structural diagram of the mounting plate of the present invention; Figure 4 This is a top-view three-dimensional structural diagram of the lifting horizontal plate of the present invention; Figure 5 This is a top-view three-dimensional structural diagram of the driving horizontal plate of the present invention; Figure 6 For the present invention Figure 3 Enlarged structural diagram at point A in the diagram; Figure 7 This is a top-view three-dimensional structural diagram of the drive shaft of the present invention; Figure 8 This is a top-view three-dimensional structural diagram of the dehumidification frame of the present invention; Figure 9 This is a top view of the three-dimensional structure of the pressing plate of the present invention; Figure 10 This is a bottom-view three-dimensional structural diagram of the receiving block of the present invention; Figure 11 This is a top view of the three-dimensional structure of the limiting groove plate of the present invention; Figure 12 This is a top-view three-dimensional structural diagram of the control board of the present invention.

[0024] In the diagram: 1. Main body; 2. Mounting plate; 3. Air outlet; 4. Air inlet; 5. Cooling fan; 6. Dehumidification frame; 7. Miniature push rod; 8. Lifting horizontal plate; 9. Connecting rod; 10. Drive horizontal plate; 11. Motion slot; 12. Sliding block; 13. Roller; 14. Drive shaft; 15. Connecting piece; 16. Sealing plate; 17. Dehumidification hole; 18. Pressing plate; 19. Resin elastic moisture-absorbing block; 20. Receiving block; 21. Receiving hole plate; 22. Limiting groove plate; 23. Lifting plate; 24. Drain pipe; 25. Fixing block; 26. Sliding rod; 27. Sealing piece; 28. Return spring; 29. ​​Dustproof net; 30. Extrusion rod; 31. Control plate; 32. Control shaft; 33. Control slot. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: As Figures 1-4 As shown, the present invention provides the following technical solution: an industrial computer with controllable internal humidity, including a mounting plate 2 fixedly installed inside the body 1, and an air outlet 3 and an air inlet 4 opened on the outside of the body 1, and a cooling fan 5 is provided at the upper end of the mounting plate 2, while a dustproof net 29 is provided inside the air inlet 4. The unit 1 has a dehumidification structure inside, which can control the humidity inside the unit 1. The unit 1 also has an opening and closing structure inside, which can control the closing of the air outlet 3 and the air inlet 4.

[0027] When using this humidity-controlled industrial computer, the air inside and outside the machine body 1 can be replaced through the air outlet 3 and the air inlet 4. The air passing through the air inlet 4 needs to be filtered through the dust filter 29. During the air replacement process, the heat inside the machine body 1 is carried away by the air, thus completing the heat dissipation process inside the machine body 1.

[0028] like Figures 4-5 and Figure 8 As shown, the opening and closing structure includes a dehumidifying frame 6, which is fixedly installed inside the body 1. Two sets of miniature push rods 7 are fixedly installed on the outside of the dehumidifying frame 6, and a lifting cross plate 8 is fixedly installed on the upper end of the miniature push rods 7.

[0029] During operation, the miniature push rod 7 directly drives the lifting plate 8 to move up and down inside the dehumidification frame 6.

[0030] like Figures 6-7 As shown, a connecting rod 9 is fixedly installed at the lower end of the lifting horizontal plate 8, and two sets of motion grooves 11 are opened inside the driving horizontal plate 10 fixedly installed at the lower end of the connecting rod 9. A sliding block 12 is slidably installed inside the motion groove 11. A roller 13 is rotatably installed on the outside of the sliding block 12 at the upper and lower ends of the driving horizontal plate 10, and a drive shaft 14 is rotatably installed at the lower end of the sliding block 12.

[0031] The vertical movement of the lifting plate 8 directly drives the drive plate 10 through the connecting rod 9, while the drive plate 10 drives the sliding block 12 and the drive shaft 14 to move vertically.

[0032] like Figures 5-7 As shown, the opening and closing structure also includes a sealing plate 16, which is rotatably installed inside the body 1. The connecting piece 15 fixedly installed on the outside of the sealing plate 16 is located on the outside of the drive shaft 14. At the same time, the sealing plate 16 is located on the side of the air outlet 3 and the air inlet 4 close to the inside of the body 1.

[0033] During the movement of the drive shaft 14, the sealing plate 16 will rotate through the connector 15, causing the sealing plate 16 to separate from the air outlet 3 and the air inlet 4, providing conditions for the internal airflow of the air outlet 3 and the air inlet 4. During this process, the sliding block 12 will slide inside the motion groove 11, while the roller 13 will roll on the outside of the drive cross plate 10, providing conditions for the stable movement of the sliding block 12.

[0034] like Figure 8 As shown, the dehumidification structure includes a dehumidification frame 6 and a pressing plate 18, and the pressing plate 18 is fixedly installed at the lower end of the lifting horizontal plate 8, and the dehumidification frame 6 has dehumidification holes 17 equidistantly opened inside.

[0035] During the downward movement of the lifting horizontal plate 8, the pressing plate 18 will move down synchronously inside the dehumidification frame 6, and the dehumidification hole 17 is set to provide conditions for the resin elastic moisture-absorbing block 19 at the lower end of the pressing plate 18 to absorb moisture.

[0036] like Figures 9-10 As shown, a pressing rod 30 is fixedly installed at the lower end of the pressing plate 18, and a receiving block 20 is fixedly installed at the lower end of the pressing rod 30. A receiving hole plate 21, which is slidably installed on the outside of the pressing rod 30, is located at the upper end of the receiving block 20. Meanwhile, a resin elastic moisture-absorbing block 19, which is provided between the receiving hole plate 21 and the pressing plate 18, is located on the outside of the pressing rod 30.

[0037] When the lifting plate 8 moves downward, it will cause the extrusion rod 30 and the receiving plate 21 to move downward simultaneously. When the lower end of the receiving plate 21 contacts the lower end of the dehumidification frame 6, the lifting plate 8 and the extrusion rod 30 will continue to move downward. The lifting plate 8 will work with the receiving plate 21 to squeeze the resin elastic moisture-absorbing block 19, so that the water vapor inside the resin elastic moisture-absorbing block 19 can be discharged and flow into the drain pipe 24, so that the water inside the resin elastic moisture-absorbing block 19 is discharged and the moisture absorption effect is maintained.

[0038] like Figures 8-9 As shown, a drain pipe 24 is fixedly installed at the lower end of the dehumidification frame 6, and a fixing block 25 is fixedly installed inside the drain pipe 24. A sliding rod 26 is slidably installed inside the fixing block 25. A sealing member 27 fixedly installed at the upper end of the sliding rod 26 is in close contact with the inside of the drain pipe 24, and a return spring 28 sleeved on the outside of the sliding rod 26 is located between the sealing member 27 and the fixing block 25.

[0039] During the downward movement of the extrusion rod 30, it will directly push the seal 27 downward and separate it from the drain pipe 24. At this time, a gap will be formed between the drain pipe 24 and the seal 27, thereby draining the water overflowing from the resin elastic moisture-absorbing block 19. At this time, the return spring 28 will be squeezed and contracted by the fixing block 25 and the seal 27.

[0040] like Figures 10-11 As shown, a limiting groove plate 22 is fixedly installed at the lower end of the pressing plate 18, and a lifting plate 23 is slidably installed between the two sets of limiting groove plates 22 on the left and right sides, penetrating the resin elastic moisture-absorbing block 19, and the four sets of lifting plates 23 are staggered vertically.

[0041] During the compression of the resin elastic moisture-absorbing block 19, the lifting plate 23 slides inside the limiting groove plate 22 and moves closer to the pressing plate 18, providing conditions for the resin elastic moisture-absorbing block 19 to squeeze out water. At the same time, when the lifting plate 23 resets, it will assist the resin elastic moisture-absorbing block 19 to reset, ensuring the fluffy state of the resin elastic moisture-absorbing block 19 and providing conditions for the water absorption effect of the resin elastic moisture-absorbing block 19.

[0042] like Figure 10 and Figure 12 As shown, two sets of control plates 31 are rotatably mounted on the outer side of the pressing plate 18, and a control shaft 32 is rotatably mounted on the outer side of the control plate 31. The end of the control shaft 32 away from the control plate 31 is located inside the control groove 33 opened inside the dehumidification frame 6. At the same time, the distance between the upper ends of the two sets of control grooves 33 is smaller than the distance between their lower ends.

[0043] During the process of the pressing plate 18 moving down to squeeze the resin elastic moisture-absorbing block 19, the control shaft 32 will move down inside the control groove 33, and the control plate 31 will move down in a horizontal state. When the control plate 31 moves up to reset, the control shaft 32 will cause the control plate 31 to be in an inclined state under the action of the upper end of the control groove 33, so as to prevent water droplets on the upper end of the control plate 31 from dripping into the interior of the body 1 through the notches on both sides of the dehumidification frame 6. At the same time, the upper end of the pressing plate 18 is set in an inclined state to further prevent water droplets from accumulating on the upper end of the pressing plate 18.

[0044] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An industrial computer with controllable internal humidity, comprising a mounting plate (2) fixedly installed inside the body (1), and an air outlet (3) and an air inlet (4) opened on the outside of the body (1), and a cooling fan (5) is provided at the upper end of the mounting plate (2), while a dustproof net (29) is provided inside the air inlet (4). Its features are: The body (1) is equipped with a dehumidification structure inside, and the dehumidification structure can control the humidity inside the body (1). The body (1) is equipped with an opening and closing structure inside, and the opening and closing structure can control the closure of the air outlet (3) and the air inlet (4).

2. The industrial computer with controllable internal humidity according to claim 1, characterized in that: The opening and closing structure includes a dehumidification frame (6), which is fixedly installed inside the body (1). Two sets of miniature push rods (7) are fixedly installed on the outside of the dehumidification frame (6), and a lifting cross plate (8) is fixedly installed on the upper end of the miniature push rods (7).

3. The industrial computer with controllable internal humidity according to claim 2, characterized in that: The lower end of the lifting plate (8) is fixedly installed with a connecting rod (9), and the lower end of the connecting rod (9) is fixedly installed with a drive plate (10) with two sets of motion grooves (11) inside. The motion grooves (11) are slidably installed with sliding blocks (12) inside. The rollers (13) rotatably installed on the outside of the sliding blocks (12) are located at the upper and lower ends of the drive plate (10), and the lower end of the sliding blocks (12) is rotatably installed with a drive shaft (14).

4. The industrial computer with controllable internal humidity according to claim 3, characterized in that: The opening and closing structure also includes a sealing plate (16), and the sealing plate (16) is rotatably installed inside the body (1), and the connector (15) fixedly installed on the outside of the sealing plate (16) is located on the outside of the drive shaft (14), while the sealing plate (16) is located on the side of the air outlet (3) and air inlet (4) close to the inside of the body (1).

5. The industrial computer with controllable internal humidity according to claim 4, characterized in that: The dehumidification structure includes a dehumidification frame (6) and a pressing plate (18), and the pressing plate (18) is fixedly installed at the lower end of the lifting horizontal plate (8), and the dehumidification frame (6) has dehumidification holes (17) equidistantly opened inside.

6. The industrial computer with controllable internal humidity according to claim 5, characterized in that: The lower end of the pressing plate (18) is fixedly installed with a pressing rod (30), and the lower end of the pressing rod (30) is fixedly installed with a receiving block (20). The receiving hole plate (21) slidably installed on the outside of the pressing rod (30) is located at the upper end of the receiving block (20). At the same time, the resin elastic moisture-absorbing block (19) set between the receiving hole plate (21) and the pressing plate (18) is located on the outside of the pressing rod (30).

7. The industrial computer with controllable internal humidity according to claim 6, characterized in that: The lower end of the dehumidification frame (6) is fixedly installed with a drain pipe (24), and a fixing block (25) is fixedly installed inside the drain pipe (24). A sliding rod (26) is slidably installed inside the fixing block (25). The sealing element (27) fixedly installed at the upper end of the sliding rod (26) is in close contact with the inside of the drain pipe (24), and the return spring (28) sleeved on the outside of the sliding rod (26) is located between the sealing element (27) and the fixing block (25).

8. The industrial computer with controllable internal humidity according to claim 7, characterized in that: The lower end of the pressing plate (18) is fixedly installed with a limiting groove plate (22), and the lifting plate (23) slidably installed between the two sets of limiting groove plates (22) penetrates the resin elastic moisture-absorbing block (19), and the four sets of lifting plates (23) are staggered vertically.

9. The industrial computer with controllable internal humidity according to claim 8, characterized in that: Two sets of control plates (31) are rotatably mounted on the outer side of the pressing plate (18), and a control shaft (32) is rotatably mounted on the outer side of the control plate (31). The end of the control shaft (32) away from the control plate (31) is located inside the control groove (33) opened inside the dehumidification frame (6). At the same time, the distance between the upper ends of the two sets of control grooves (33) is smaller than the distance between their lower ends.

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