Anti-condensation pressure relief plug

Abstract

The application relates to the technical field of aging test equipment, and discloses an anti-condensation pressure relief plug. The pressure relief plug comprises a tubular main body, an annular sealing ring, a circular piston sheet, springs, spring stoppers and a metal mesh; the annular sealing ring is fixed in the tubular main body, and a groove is arranged on the inner side of the annular sealing ring; the circular piston sheet is slidably connected in the tubular main body, the outer ring of the circular piston sheet is provided with radially-extending flexible sealing sheets, and the flexible sealing sheets are in contact with or dislocated from the inner side of the groove of the annular sealing ring when sliding; two groups of springs are arranged on the two sides of the piston sheet to provide sliding damping, and two groups of spring stoppers are connected to the inner wall of the tubular main body to clamp the springs and the piston sheet; the metal mesh is arranged at one end of the tubular main body inserted into a temperature box and is used for intercepting water vapor condensed in the gap between the piston sheet and the sealing ring; the pressure in the temperature box can be self-adaptively balanced, the temperature box can be prevented from shaking and the support structure from aging due to pressure fluctuation, water vapor can be intercepted through the metal mesh, humidity imbalance in the temperature box can be prevented, test data accuracy can be ensured, and the practicability and reliability of the aging test equipment are improved.

Description

Technical Field

[0001] This application relates to the technical field of aging test equipment, and in particular to an anti-condensation pressure relief plug. Background Technology

[0002] The three-dimensional integrated test, also known as the temperature-humidity-vibration integrated environmental test, tests products by combining three environmental stresses: temperature, humidity, and vibration. This accelerates the exposure of potential product defects, such as process defects, material aging, and component failures. The test process requires the three-dimensional integrated test chamber and the electric vibration test system to work together.

[0003] Based on testing requirements, equipment structure, and spatial layout, the mainstream combination types are currently divided into four categories: built-in combination, external combination, split combination, and integrated combination. Among them, the external combination is the most widely used and common method due to its advantages of wide applicability, high economy, and the ability of the temperature chamber and vibration table to operate independently.

[0004] Existing technology (publication number: CN221302685U) discloses a pressure-adaptive structure for a three-integrated system. The vibration table can drive the flexible insulation cloth to move up and down in a piston-like manner, which is prone to vibration. Although this existing technology places the vent at the top and sets up a sealing structure that can automatically extend and retract with the up and down movement of the extension table, the air pressure inside the chamber fluctuates frequently with the movement when the vibration amplitude is large. The resulting pressure will still pull the chamber to sway with the table, which will accelerate the aging and damage of the support structure in the long run and poses a serious safety hazard.

[0005] If the seal is broken by drilling to alleviate vibration, it will cause an imbalance of water vapor, resulting in inaccurate "temperature-humidity-vibration" comprehensive test.

[0006] Therefore, how to mitigate the aging and damage to the support structure caused by shaking and prevent moisture intrusion has become an urgent technical problem to be solved. Utility Model Content

[0007] The technical problem to be solved in this application is: how to reduce the aging and damage of the support structure caused by shaking and prevent moisture intrusion, which has become an urgent technical problem to be solved.

[0008] To address the aforementioned technical problems, this application provides an anti-condensation pressure relief plug, which is installed on a pre-drilled hole in the incubator. The anti-condensation pressure relief plug includes: a tubular body with an annular sealing ring fixed inside, the inner ring of which has a groove; a circular piston plate with a radially extending flexible sealing sheet on its outer ring, the circular piston plate being axially slidably connected to the tubular body; when the circular piston plate slides within a preset pressure difference range, the flexible sealing sheet adheres to the inner side of the groove of the annular sealing ring to block the airflow on both sides of the annular sealing ring; when the circular piston plate slides outside the preset pressure difference range, the flexible sealing sheet disengages from the groove of the annular sealing ring, allowing airflow to pass through the tubular body; two sets of springs are respectively disposed on both sides of the circular piston plate to generate damping when the circular piston plate slides; two sets of spring stops are connected to the inner wall of the tubular body to clamp the two sets of springs and the circular piston plate; and a metal mesh placed at one end of the tubular body inserted into the incubator to condense water vapor entering through the gap between the circular piston plate and the annular sealing ring.

[0009] In one embodiment, an annular airbag is fitted onto the tubular body, and the annular airbag is used to fill the gap between the tubular body and the reserved hole.

[0010] In one embodiment, a drain pipe is provided below the metal mesh, and the drain pipe is connected to the outside. A number of drain holes are provided at one end of the drain pipe near the metal mesh. The drain holes are used to guide the condensation on the metal mesh into the drain pipe so that the condensation on the metal mesh can be discharged from the anti-condensation pressure relief plug.

[0011] In one embodiment, a baffle plate is provided between the drain hole and the spring. The baffle plate is fixed on the inner wall below the tubular body to prevent condensation on the metal mesh from entering the moving area of ​​the circular piston plate.

[0012] In one embodiment, one end of the tubular body inserted into the incubator is bent upwards.

[0013] In one embodiment, the two sets of spring stops are slidably connected to the inner wall of the tubular body. The anti-condensation pressure relief plug also includes a damping adjustment rod, which is threadedly connected to the two sets of spring stops respectively. The screwing directions of the two threaded connections between the damping adjustment rod and the two sets of spring stops are opposite.

[0014] In one embodiment, an adjustment knob is provided at one end of the damping adjustment rod extending out of the tubular body.

[0015] In one embodiment, the metal mesh is made of pure copper and has a honeycomb shape.

[0016] In one embodiment, the mesh diameter of the metal mesh is 3 to 5 millimeters.

[0017] In one embodiment, the diameter of the circular piston plate is 70 mm, the thickness of the circular piston plate is 10 mm, and the thickness of the flexible sealing plate is 2 mm.

[0018] Compared with the prior art, the anti-condensation pressure relief plug of this application has the following advantages: The anti-condensation pressure relief plug of this application uses a thicker circular piston plate and a harder flexible sealing plate to form a piston with composite properties. Combined with an annular sealing ring, it forms a strong seal under small air pressure difference (the flexible sealing plate is in the groove) and a weak seal under atmospheric pressure difference (the flexible sealing plate is removed from the groove, and the airflow can pass through the anti-condensation pressure relief plug). Therefore, when the pressure fluctuates greatly, the temperature chamber using the anti-condensation pressure relief plug of this application will not produce violent vibration because the airflow can pass through, thereby reducing the aging and damage to the support structure caused by shaking.

[0019] Meanwhile, due to the presence of the metal mesh, even if water vapor enters the anti-condensation pressure relief plug, it will first form condensation on the metal mesh, thereby reducing the change in experimental conditions caused by water vapor entering the incubator. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0021] Figure 2 This is a simplified front view diagram of the structure of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0022] Figure 3 This is a simplified enlarged view at point A of the structure of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0023] Figure 4 This is a simplified schematic diagram illustrating the sliding of a circular piston plate of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0024] Figure 5 This is a simplified schematic diagram of another sliding of a circular piston plate of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0025] Figure 6 This is a simplified schematic diagram of the damping adjustment rod of an anti-condensation pressure relief plug, as exemplarily shown in an embodiment of this application.

[0026] Figure label: 1. Anti-condensation pressure relief plug; 11. Tubular body; 12. Annular sealing ring; 13. Circular piston plate; 131. Flexible sealing plate; 14. Spring; 15. Spring stop; 16. Metal mesh; 17. Annular airbag; 18. Drain pipe; 181. Drain hole; 19. Water baffle; 20. Damping adjustment rod; 201. Adjustment knob. Detailed Implementation

[0027] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0028] In the description of this application, it should be understood that the terms "comprising," "having," and any variations thereof in this specification and claims are intended to cover non-exclusive inclusion. For example, a product or device comprising a series of components or units is not limited to those expressly listed components or units, but may also include other components or units not expressly listed but inherent to these products or devices. In this application, "internal" refers to the interior of the incubator, while "external" refers to the exterior of the incubator.

[0029] The three-dimensional environmental test, also known as the temperature-humidity-vibration integrated environmental test, tests products by superimposing three environmental stresses: temperature, humidity, and vibration. This accelerates the exposure of potential problems such as manufacturing defects, material aging, and component failures, providing crucial evidence for product reliability verification. This test requires the coordinated operation of a three-dimensional environmental test chamber and an electric vibration testing system; the combination of these two directly affects the test's efficiency and applicability.

[0030] Based on testing requirements, equipment structure, and spatial layout, the mainstream combination forms of three-dimensional integrated testing systems are currently divided into four categories: built-in, external, split, and integrated. Among them, the external combination has become the most widely used and mature combination method in current industrial applications due to its core advantages of wide adaptability, superior economy, and the ability of the temperature chamber and vibration table to operate independently.

[0031] The prior art (publication number: CN221302685U) discloses a pressure adaptive structure for a three-integrated system. When the vibration table moves the flexible insulation cloth up and down in a piston-like manner, it easily causes the temperature chamber to vibrate. Although this technology optimizes the pressure balance by placing an upper vent and setting an automatic telescopic sealing structure that moves up and down with the expansion table, when the vibration amplitude is large, the air pressure inside the chamber will still fluctuate frequently with the movement of the table. The resulting pressure will pull the temperature chamber to shake synchronously. Long-term operation will not only accelerate the aging and damage of the support structure, but also pose serious safety hazards such as equipment tipping over.

[0032] If the chamber seal is damaged by drilling holes to alleviate vibration, it will lead to an imbalance of moisture inside the chamber, directly causing inaccurate testing of the three factors of "temperature-humidity-vibration" and failing to meet the reliability requirements of the test data. Therefore, how to reduce "shaking-induced support aging" while preventing moisture intrusion has become a critical technical challenge that urgently needs to be overcome in the application of external three-dimensional integrated testing systems.

[0033] like Figure 1 The three-dimensional diagram shown Figure 2 The simplified front view diagram shown and Figure 3 As shown in the enlarged simplified diagram, this application addresses the aforementioned technical pain points by providing an anti-condensation pressure relief plug 1. This pressure relief plug is directly installed on the reserved hole of the temperature chamber of the three-integrated test system. Through the integrated structural design of adaptive pressure relief and condensation interception, it simultaneously solves the two major problems of "temperature chamber shaking caused by air pressure fluctuations" and "water vapor imbalance caused by pressure relief".

[0034] Specifically, such as Figure 2 As shown, the anti-condensation pressure relief plug 1 includes a tubular body 11, an annular sealing ring 12, a circular piston plate 13, a spring 14, a spring stop 15, and a metal mesh 16. The components work together to achieve the function.

[0035] An annular sealing ring 12 is fixed inside the tubular body 11. The inner ring of the annular sealing ring 12 has a groove. The outer ring of the circular piston plate 13 has a radially extending flexible sealing sheet 131. The circular piston plate 13 is axially slidably connected to the tubular body 11. When the circular piston plate 13 slides within a preset pressure difference range, the flexible sealing sheet 131 fits against the inner side of the groove of the annular sealing ring 12 to block the airflow on both sides of the annular sealing ring 12. When the circular piston plate 13 slides outside the preset pressure difference range, the flexible sealing sheet 131 disengages from the groove of the annular sealing ring 12, allowing the airflow to pass through the tubular body. Two sets of springs 14 are respectively disposed on both sides of the circular piston plate 13 to generate damping when the circular piston plate 13 slides. Two sets of spring stops 15 are connected to the inner wall of the tubular body 11 to clamp the two sets of springs 14 and the circular piston plate 13. A metal mesh 16 is placed at one end of the tubular body 11 that is inserted into the temperature chamber to condense the water vapor entering through the gap between the circular piston plate 13 and the annular sealing ring 12.

[0036] Understandably, the magnitude of the pressure difference determines the thrust that pushes the circular piston plate 13, and the thrust needs to resist the elastic force of the spring 14. Therefore, the spring 14 determines the opening threshold, and the pressure difference below the opening threshold is considered to be within the preset pressure difference range.

[0037] Therefore, different preset pressure difference ranges can be achieved by replacing springs 14 with springs of different specifications.

[0038] In the above scheme, the composite structure formed by the annular sealing ring 12, the flexible sealing sheet 131 and the circular piston plate 13 achieves strong sealing under small air pressure difference and weak sealing under atmospheric pressure difference. It can automatically balance the fluctuating air pressure in the temperature chamber, reduce the violent shaking caused by pressure pulling the temperature chamber, and slow down the aging and damage of the support structure from the root.

[0039] For details, please refer to Figure 4 and Figure 5The schematic diagram shows that when the internal air pressure is higher than the external air pressure, the airflow generated by the pressure difference pushes the circular piston plate 13 to slide outward. When the internal air pressure is lower than the external air pressure, the airflow generated by the pressure difference pushes the circular piston plate 13 to slide inward. In both sliding directions, airflow can enter and exit through the gap, thereby balancing the air pressure fluctuations.

[0040] Meanwhile, the anti-condensation pressure relief plug 1 has a metal mesh 16 at one end near the inside of the chamber. Even if water vapor seeps in from the gap between the piston plate and the sealing ring, it will first form condensation on the metal mesh 16, effectively blocking water vapor from entering the chamber and preventing humidity imbalance inside the chamber.

[0041] Overall, the anti-condensation pressure relief plug 1 has a simplified and modular design, allowing for direct installation through the pre-drilled holes in the temperature chamber without requiring modifications to the existing test equipment. The automatic response design of the damped spring 14 eliminates the need for manual intervention, reducing both the time and cost of equipment upgrades and the workload of subsequent maintenance, thus adapting to the application requirements of external three-dimensional integrated test systems.

[0042] In a further embodiment of this application, an annular airbag 17 may be fitted onto the tubular body 11, and the annular airbag 17 is used to fill the gap between the tubular body 11 and the reserved hole.

[0043] On the one hand, the annular airbag 17 can completely fill the gap between the tubular body 11 and the reserved hole of the temperature chamber through inflation or its own elasticity, making up for the shortcomings of the sealing in the installation process. Together with the adaptive air pressure seal of the anti-condensation pressure relief plug 1, it forms a double protection, further reducing the risk of external water vapor and air seeping into the gap or the leakage of humid and hot air from the temperature chamber, and further ensuring the stability and data accuracy of the "temperature-humidity-vibration" test environment.

[0044] On the other hand, the flexible and extensible characteristics of the annular airbag 17 can accommodate the slight size error of the reserved hole, eliminating the need to customize the tubular body 11 or process the reserved hole with high precision for different incubators, greatly improving the compatibility range of the pressure relief plug with different brands and models of incubators, and reducing the installation and commissioning costs for enterprises.

[0045] Furthermore, the flexible airbag can buffer the rigid collision and friction between the tubular main body 11 and the reserved hole when the incubator shakes, reducing the wear of the hole wall and the deformation of the tubular main body 11.

[0046] Furthermore, no additional sealant or gaskets are required during installation; simply insert it and inflate it to complete the seal. To remove it, simply deflate it, making it convenient and practical.

[0047] In one embodiment, a drain pipe 18 is provided below the metal mesh 16. The drain pipe 18 is connected to the outside. A plurality of drain holes 181 are provided at one end of the drain pipe 18 near the metal mesh 16. The drain holes 181 are used to guide the condensation on the metal mesh 16 into the drain pipe 18 so that the condensation on the metal mesh 16 can be discharged from the anti-condensation pressure relief plug 1.

[0048] In this embodiment, a drain pipe 18 with drainage holes 181 is provided below the metal mesh 16 and connected to the outside, so that the condensation intercepted by the metal mesh 16 can be directly drained out, thus avoiding the accumulation of condensation and dripping back into the temperature chamber and damaging the test environment.

[0049] In one embodiment, a baffle plate 19 is provided between the drain hole 181 and the spring 14. The baffle plate 19 is fixed on the inner wall below the tubular body 11 and is used to prevent condensation on the metal mesh 16 from entering the active area of ​​the circular piston plate 13.

[0050] A baffle plate 19 is added between the drain hole 181 and the spring 14 to directly prevent condensation on the metal mesh 16 from flowing to the moving area of ​​the circular piston plate 13. This avoids condensation contacting the piston plate, spring 14, and other components, preventing sealing failure or slippage due to moisture, and ensuring the stability of the adaptive pressure relief function. It also reduces corrosion of the metal parts in the piston's moving area by condensation, extending the life of the core components.

[0051] At the same time, there is no need to worry about condensation seeping into the active area and causing malfunctions, further reducing the maintenance frequency and cost of the pressure relief plug. In addition, the fixing method of the baffle plate 19 does not affect the original structure, taking into account both functionality and practicality.

[0052] In one embodiment, one end of the tubular body 11 inserted into the temperature chamber is bent upwards. The upward bend changes the airflow direction, slows down the airflow speed, improves the gas liquefaction effect, and allows water vapor to condense better on the metal mesh 16.

[0053] like Figure 2 The aforementioned simplified front view diagram and Figure 6 As shown in the simplified structural diagram of the damping adjustment rod 20, in one embodiment, two sets of spring stops 15 are slidably connected to the inner wall of the tubular body 11. The anti-condensation pressure relief plug 1 also includes a damping adjustment rod 20, which is threadedly connected to the two sets of spring stops 15 respectively. The screwing directions of the two threaded connections between the damping adjustment rod 20 and the two sets of spring stops 15 are opposite.

[0054] It is understandable that the damping adjustment rod 20 and the two sets of spring stops 15 form two threaded connections. Since the screwing directions of the two threaded connections are opposite, when the damping adjustment rod 20 is rotated, the two sets of spring stops 15 will slide in opposite directions, resulting in an increase or decrease in the distance between them. This achieves the adjustment of the compression of the spring 14, and thus adjusts the damping of the spring 14.

[0055] Adjustable damping means that the damping can be flexibly adapted to the magnitude of pressure fluctuations in the chamber under different test scenarios (such as sensitive response for small fluctuations and stable buffering for large fluctuations), ensuring that the piston plate slides smoothly without jamming or excessive pressure, and precisely balancing the sealing and pressure relief effects.

[0056] Meanwhile, when the elastic force of spring 14 decreases after long-term use, the compression amount can be adjusted to compensate for the elastic force, and the damping performance can be restored without replacing spring 14, thus extending the life of core components and reducing maintenance costs.

[0057] For ease of adjustment, in one embodiment of this application, the end of the damping adjustment rod 20 extending out of the tubular body 11 is provided with an adjustment knob 201.

[0058] In one embodiment, the metal mesh 16 is made of pure copper and has a honeycomb shape.

[0059] Pure copper has high thermal conductivity, enabling rapid heat exchange with the humid air inside the incubator and accelerating water vapor condensation. Its honeycomb structure has a large surface area, allowing it to contact more humid air, further improving condensation efficiency, and its stable structure is resistant to deformation due to vibration. These two factors work together to make condensation interception more efficient. At the same time, pure copper has better corrosion resistance than ordinary metals, reducing the erosion of the mesh by the humid environment of the incubator and extending its service life. In an exemplary embodiment, the mesh diameter of the metal mesh 16 can be 3 to 5 millimeters.

[0060] In one embodiment, the diameter of the circular piston plate 13 is 70 mm, the thickness of the circular piston plate 13 is 10 mm, and the thickness of the flexible sealing plate 131 is 2 mm.

[0061] The 70 mm diameter of the circular piston plate 13 is an exemplary parameter provided in this application embodiment and is not intended to limit this application. It can also be flexibly adjusted according to the actual diameter of the reserved hole in the temperature chamber, the expansion coefficient of the annular airbag 17, and the core functional requirements of the pressure relief plug. For example, if the diameter of the reserved hole in the temperature chamber is close to 100 mm, the diameter of the tubular body 11 can be adapted to 80 mm-90 mm, and the remaining gap can be filled by the elastic expansion of the annular airbag 17. If the diameter is close to 120 mm, the diameter of the tubular body 11 can be adjusted to 90 mm-100 mm, and the sealing adaptation can also be achieved by relying on the annular airbag 17.

[0062] During the adjustment process, it is only necessary to ensure that there is sufficient space inside the tubular body 11 to accommodate core components such as the circular piston plate 13 and the spring 14, without affecting the basic functions of "adaptive pressure relief" and "condensation interception". This adjustable parameter design avoids the trouble of customizing multiple specifications of the tubular body 11 due to differences in orifice size, and can rely on the compatibility of the annular airbag 17 to ensure stable installation and sealing of temperature chambers with different orifice sizes, further enhancing the universality and practical value of the solution in this application.

[0063] This application provides an anti-condensation pressure relief plug 1 to solve the problems of "shaking caused by temperature chamber pressure fluctuation" and "water vapor imbalance caused by pressure relief" in an external three-dimensional test system. Its basic structure is installed in the reserved hole of the temperature chamber and includes a tubular body 11, an annular sealing ring 12 (with a groove in the inner ring), a circular piston plate 13 with a flexible sealing sheet 131 (sliding inside the tubular body 11), springs 14 on both sides of the piston plate, spring stops 15 that clamp the springs 14 and the piston plate, and a metal mesh 16 placed at the temperature chamber end of the tubular body 11. It achieves adaptive pressure relief by "strong sealing with small pressure difference and weak sealing with large pressure difference", and the metal mesh 16 intercepts water vapor condensation.

[0064] Based on this, several embodiments are further optimized: the tubular body 11 is equipped with annular airbags 17 to fill the gap between the pre-reserved holes and enhance the sealing and adaptability; a drain pipe 18 with a drain hole 181 is provided below the metal mesh 16 to connect to the outside and discharge condensation; a baffle plate 19 is provided between the drain hole 181 and the spring 14 to prevent condensation from entering the piston movement area; the spring stop 15 is slidably connected to the inner wall of the tubular body 11 and is equipped with a reverse threaded damping adjustment rod 20, which can be rotated to adjust the compression and damping of the spring 14; fifth, the metal mesh 16 adopts a pure copper honeycomb structure to improve condensation efficiency and durability.

[0065] This application's anti-condensation pressure relief plug 1 and its various embodiments address the pain points of existing technologies from multiple dimensions, resulting in significant technical effects. Regarding pressure relief and sealing, an adaptive structure balances the chamber pressure, preventing chamber swaying, and a ring-shaped airbag 17 achieves double sealing, eliminating secondary water vapor leakage. For condensation control, a pure copper honeycomb metal mesh 16 efficiently condenses condensation, a drain pipe 18 promptly drains condensation, and a baffle plate 19 protects core components, completely preventing water vapor intrusion and damage to the test environment. In terms of flexibility and maintenance, the damping adjustment rod 20 can adapt to different pressure fluctuation scenarios, and each structure is compatible with existing chambers without complex modifications, reducing component corrosion and manual maintenance, and extending equipment lifespan. Overall, it ensures stable "temperature-humidity-vibration" test conditions, improves data accuracy, and reduces installation and maintenance costs, significantly enhancing the practicality and reliability of the external three-dimensional integrated test system.

[0066] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A pressure relief plug for preventing condensation, characterized in that, The anti-condensation pressure relief plug is installed on the reserved hole of the temperature chamber, and the anti-condensation pressure relief plug (1) includes: A tubular body (11) has an annular sealing ring (12) fixed inside it, and the inner ring of the annular sealing ring (12) has a groove. A circular piston plate (13) is provided with a flexible sealing plate (131) extending radially on the outer ring of the circular piston plate (13). The circular piston plate (13) is axially slidably connected to the tubular body (11). When the circular piston plate (13) slides within a preset pressure difference range, the flexible sealing plate (131) fits against the inner side of the groove of the annular sealing ring (12) to block the airflow on both sides of the annular sealing ring (12). When the circular piston plate (13) slides outside the preset pressure difference range, the flexible sealing plate (131) disengages from the groove of the annular sealing ring (12) to allow the airflow to pass through the tubular body. Springs (14), two sets of springs (14) are respectively disposed on both sides of the circular piston plate (13) to generate damping when the circular piston plate (13) slides; Spring stops (15), two sets of spring stops (15) are connected to the inner wall of the tubular body (11) for clamping the two sets of springs (14) and the circular piston plate (13). A metal mesh (16) is placed at one end of the tubular body (11) inserted into the temperature chamber to condense water vapor entering through the gap between the circular piston plate (13) and the annular sealing ring (12).

2. The anti-condensation pressure relief plug according to claim 1, characterized in that, The tubular body (11) is fitted with an annular airbag (17), which is used to fill the gap between the tubular body (11) and the reserved hole.

3. The anti-condensation pressure relief plug according to claim 1, characterized in that, A drain pipe (18) is provided below the metal mesh (16). The drain pipe (18) is connected to the outside. A plurality of drain holes (181) are provided at one end of the drain pipe (18) near the metal mesh (16). The drain holes (181) are used to guide the condensation on the metal mesh (16) into the drain pipe (18) so as to discharge the condensation on the metal mesh (16) from the anti-condensation pressure relief plug (1).

4. The anti-condensation pressure relief plug according to claim 3, characterized in that, A baffle plate (19) is provided between the drain hole (181) and the spring (14). The baffle plate (19) is fixed on the inner wall below the tubular body (11) to prevent condensation on the metal mesh (16) from entering the active area of ​​the circular piston plate (13).

5. The anti-condensation pressure relief plug according to claim 4, characterized in that, The tubular body (11) is inserted into the temperature box at one end and bent upward.

6. The anti-condensation pressure relief plug according to claim 1, characterized in that, The two sets of spring stops (15) are slidably connected to the inner wall of the tubular body (11). The anti-condensation pressure relief plug (1) also includes a damping adjustment rod (20). The damping adjustment rod (20) is threadedly connected to the two sets of spring stops (15) respectively. The screwing directions of the two threaded connections of the damping adjustment rod (20) and the two sets of spring stops (15) are opposite. The damping adjustment rod (20) is used to adjust the preset pressure difference range.

7. The anti-condensation pressure relief plug according to claim 6, characterized in that, The damping adjustment rod (20) has an adjustment knob (201) at one end extending out of the tubular body (11).

8. The anti-condensation pressure relief plug according to claim 1, characterized in that, The metal mesh (16) is made of pure copper and has a honeycomb shape.

9. The anti-condensation pressure relief plug according to claim 8, characterized in that, The mesh diameter of the metal mesh (16) is 3 to 5 millimeters.

10. The anti-condensation pressure relief plug according to claim 1, characterized in that, The diameter of the circular piston plate (13) is 70 mm, the thickness of the circular piston plate (13) is 10 mm, and the thickness of the flexible sealing plate (131) is 2 mm.

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