A sealed structure and environmental test chamber

Abstract

The utility model belongs to analog test device technical field discloses a kind of sealing structure and environmental test chamber.Sleeve assembly's first sleeve is through box wall hole and its first end is fixedly connected with the inner wall of box, and its second end is detachably connected with second sleeve, and second sleeve is fixedly connected with the outer wall of box;The first annular cover plate of first sealing assembly is compressed annular wool felt in the first end of first sleeve;The end of second sleeve away from first sleeve is provided with first recess along the axial direction, and first recess is used for accommodating annular sealing seat, annular sealing seat is provided with second recess, second annular cover plate is covered with elastic sealing ring in second recess and is fixedly connected with second sleeve, and annular wool felt and elastic sealing ring respectively form two end seals between the gap between connecting rod and sleeve assembly.Sealing structure solves the problem of poor sealing performance when connecting rod makes axial reciprocating motion at the box wall hole of box, and improves the sealing reliability of environmental test chamber.

Description

Technical Field

[0001] This utility model relates to the field of simulation testing device technology, and in particular to a sealing structure and environmental test chamber. Background Technology

[0002] Environmental test chambers are used to simulate climatic environments for testing samples. Therefore, they need to be relatively airtight to reduce heat exchange with the outside environment. In some tests, the sample needs to be connected to an external drive mechanism via a connecting rod, which in turn drives the connecting rod to reciprocate axially. Currently, the commonly used sealing solution is a sleeve with inner sealant. This solution is suitable for scenarios where the connecting rod is stationary, but when the connecting rod is reciprocating axially, the sealing performance is difficult to guarantee, thus affecting the test results. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure and an environmental test chamber to solve the problem of poor sealing performance when the connecting rod makes axial reciprocating motion at the through hole in the chamber wall of the environmental test chamber, thereby improving the sealing reliability of the environmental test chamber and the accuracy of the test results.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A sealing structure for sealing between the wall of a hole in a housing wall and a connecting rod penetrating the hole, the sealing structure comprising:

[0006] The sleeve assembly includes a first sleeve and a second sleeve. The first sleeve passes through the hole in the box wall and its first end is fixedly connected to the inner wall of the box body. Its second end is detachably connected to the second sleeve, and the second sleeve is fixedly connected to the outer wall of the box body.

[0007] The first sealing assembly includes an annular wool felt and a first annular cover plate, the first annular cover plate pressing the annular wool felt against the first end of the first sleeve;

[0008] The second sealing assembly includes an annular sealing seat, an elastic sealing ring, and a second annular cover plate. The second sleeve has a first groove along the axial direction at one end opposite to the first sleeve. The first groove is used to accommodate the annular sealing seat. The annular sealing seat has a second groove. The second annular cover plate covers the elastic sealing ring in the second groove and is fixedly connected to the second sleeve. The annular felt and the elastic sealing ring respectively form a two-end seal between the connecting rod and the sleeve assembly.

[0009] As an alternative sealing structure, the elastic sealing ring is provided with a V-shaped groove, which is located on the end face of the elastic sealing ring that abuts against the bottom wall of the second groove.

[0010] As an alternative sealing structure, the inner diameter of the elastic sealing ring is smaller than the diameter of the connecting rod; the inner diameter of the annular sealing seat is larger than the diameter of the connecting rod and smaller than the diameter of the first groove; the inner diameter of the second annular cover plate is larger than the diameter of the connecting rod and smaller than the diameter of the second groove.

[0011] As an alternative sealing structure, the inner diameter of the annular wool felt is smaller than the diameter of the connecting rod; the inner diameter of the first annular cover plate is larger than the diameter of the connecting rod and smaller than the outer diameter of the annular wool felt.

[0012] As an alternative sealing structure, the first sleeve includes a connecting ring and a tube body that are connected to each other. The tube body penetrates the box wall. The first end of the tube body is fixedly connected to the connecting ring. The connecting ring abuts against the inner wall of the box body. The second end of the tube body is provided with an external thread. The inner wall of the second sleeve is provided with an internal thread. The second sleeve is threadedly connected to the tube body.

[0013] As an alternative sealing structure, the first sealing assembly also includes a first fastener, which sequentially passes through the first annular cover plate, the annular felt, and the connecting ring and is threadedly connected to the inner wall of the housing.

[0014] As an alternative sealing structure, the second sealing assembly further includes an annular gasket located between the second sleeve and the second annular cover plate, wherein the inner diameter of the annular gasket is equal to the diameter of the second groove; or, the inner diameter of the annular gasket is greater than the diameter of the second groove and smaller than the diameter of the first groove.

[0015] As an alternative sealing structure, the second sealing assembly also includes a second fastener, which passes through the second annular cover plate, the annular gasket, and the second sleeve in sequence and is threadedly connected to the outer wall of the housing.

[0016] As an alternative sealing structure, the sleeve assembly includes a third fastener that passes through the bottom wall of the first groove and is threaded to the outer wall of the housing.

[0017] An environmental test chamber includes a chamber body and the aforementioned sealing structure. The chamber body has a chamber wall hole, and the sealing structure passes through the chamber wall hole and is sealed to the wall of the chamber wall hole. The sealing structure is used to seal the gap between the connecting rod passing through the chamber wall hole and the chamber body. The connecting rod passes through the sealing structure and can reciprocate along its axial direction.

[0018] Beneficial effects:

[0019] This utility model provides a sealing structure and an environmental test chamber. A detachable connection between the first and second sleeves forms a through-chamber mounting base. Combined with the compression sealing of the annular wool felt and the first annular cover plate in the first sealing assembly, and the elastic sealing ring in the second sealing assembly fixed to the annular sealing seat via the second annular cover plate, the annular wool felt and the elastic sealing ring provide a double seal for the reciprocating connecting rod. This utilizes the density and wear resistance of the wool felt to adapt to the dynamic movement of the connecting rod, while the elasticity of the sealing ring enhances sealing reliability. Furthermore, the sleeve assembly is detachable, and the first and second sealing assemblies are fixed via a cover plate structure. This combination facilitates the installation, replacement, and maintenance of the sealing structure, effectively improving the sealing performance of the connecting rod during axial reciprocating motion, reducing interference from the external environment inside the environmental test chamber, ensuring the stability of the test environment, and extending the service life of the sealing structure. Attached Figure Description

[0020] Figure 1 This is a first schematic diagram of the sealing structure provided in this embodiment of the utility model;

[0021] Figure 2 This is a second schematic diagram of the sealing structure provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the elastic sealing ring provided in this embodiment of the utility model;

[0023] Figure 4 This is a third schematic diagram of the sealing structure provided in this embodiment of the utility model;

[0024] Figure 5 This is a fourth schematic diagram of the sealing structure provided in this embodiment of the utility model;

[0025] Figure 6 This is the fifth schematic diagram of the sealing structure provided in this embodiment of the utility model.

[0026] In the picture:

[0027] 100. Box body;

[0028] 1. Sleeve assembly; 11. First sleeve; 12. Second sleeve; 111. Tube body; 112. Connecting ring; 121. First groove;

[0029] 2. First sealing assembly; 21. Annular felt; 22. First annular cover plate; 23. First fastener;

[0030] 3. Second sealing assembly; 31. Annular sealing seat; 32. Elastic sealing ring; 33. Second annular cover plate; 34. Annular gasket; 35. Second fastener; 36. Third fastener; 311. Second groove; 321. V-groove. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of the device. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper" and "lower," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] Environmental test chambers are used to simulate climatic environments for testing samples. Therefore, they need to be relatively airtight to reduce heat exchange with the outside environment. In some tests, the sample needs to be connected to an external drive mechanism via a connecting rod, which in turn drives the connecting rod to reciprocate axially. Currently, the commonly used sealing solution is a sleeve with inner sealant. This solution is suitable for scenarios where the connecting rod is stationary, but when the connecting rod is reciprocating axially, the sealing performance is difficult to guarantee, thus affecting the test results.

[0036] This embodiment provides a sealing structure and an environmental test chamber. The environmental test chamber includes a chamber body 100 and a sealing structure. The chamber body 100 has a wall hole, and the sealing structure penetrates the wall hole and is sealed to the wall of the wall hole. The sealing structure is used to seal the gap between the connecting rod penetrating the wall hole and the chamber body 100. The connecting rod passes through the sealing structure and can reciprocate along its axial direction. The wall hole here is the wall penetration hole of the chamber body 100. The wall of the wall hole is adhesively bonded to the outer wall of the sealing structure to ensure sealing performance.

[0037] like Figures 1-6 As shown, the sealing structure is used to seal the wall of the box wall hole of the box body 100 and the connecting rod that penetrates the box wall hole. The sealing structure includes a sleeve assembly 1, a first sealing assembly 2, and a second sealing assembly 3. The sleeve assembly 1 includes a first sleeve 11 and a second sleeve 12. The first sleeve 11 penetrates the box wall hole, and its first end is fixedly connected to the inner wall of the box body 100. Its second end is detachably connected to the second sleeve 12, and the second sleeve 12 is fixedly connected to the outer wall of the box body 100. The first sealing assembly 2 includes an annular wool felt 21 and a first annular cover plate 22. The first annular cover plate 22 presses against the annular wool felt. The felt 21 is located at the first end of the first sleeve 11; the second sealing assembly 3 includes an annular sealing seat 31, an elastic sealing ring 32, and a second annular cover plate 33. The end of the second sleeve 12 facing away from the first sleeve 11 is provided with a first groove 121 along the axial direction. The first groove 121 is used to accommodate the annular sealing seat 31. The annular sealing seat 31 is provided with a second groove 311. The second annular cover plate 33 covers the elastic sealing ring 32 in the second groove 311 and is fixedly connected to the second sleeve 12. The annular felt 21 and the elastic sealing ring 32 respectively form a two-end seal for the gap between the connecting rod and the sleeve assembly 1.

[0038] The sealing structure forms an installation base that runs through the chamber 100 through the detachable connection of the first sleeve 11 and the second sleeve 12. Combined with the compression sealing of the annular wool felt 21 and the first annular cover plate 22 in the first sealing assembly 2, and the combination design of the elastic sealing ring 32 in the second sealing assembly 3 fixed to the annular sealing seat 31 through the second annular cover plate 33, the annular wool felt 21 and the elastic sealing ring 32 respectively form a double seal for the reciprocating connecting rod. It utilizes the density and wear resistance of the wool felt to adapt to the dynamic movement of the connecting rod, and enhances the sealing reliability through the elastic compensation of the elastic sealing ring 32. At the same time, the sleeve assembly 1 adopts a detachable design, while the first sealing assembly 2 and the second sealing assembly 3 are fixed through the cover plate structure. This combination form facilitates the installation, replacement and maintenance of the sealing structure, effectively improves the sealing performance of the connecting rod during axial reciprocating motion, reduces the interference of the external environment on the interior of the environmental test chamber, ensures the stability of the test environment, and extends the service life of the sealing structure.

[0039] like Figure 2 , Figure 3 and Figure 4 As shown, the elastic sealing ring 32 is provided with a V-shaped groove 321, which is located on the end face of the elastic sealing ring 32 that abuts against the bottom wall of the second groove 311. The design of the V-shaped groove 321 on the end face of the elastic sealing ring 32 creates a special stress deformation space when it abuts against the bottom wall of the second groove 311. When the elastic sealing ring 32 is subjected to the clamping force of the second annular cover plate 33 or the radial force generated by the reciprocating motion of the connecting rod, the groove opening of the V-shaped groove 321 will elastically open or close due to the pressure, so that the contact surface between the sealing ring and the connecting rod surface and the bottom wall of the second groove 311 will produce adaptive deformation compensation. When the connecting rod moves in a certain direction, the elastic force on one side of the V-shaped groove 321 will increase with the increase of deformation, further strengthening the sealing pressure of the sealing surface, thereby effectively preventing gas, water vapor or dust from inside and outside the test chamber from penetrating through the gap. Meanwhile, the V-groove 321 provides more flexible deformation allowance for the elastic sealing ring 32, enabling the elastic sealing ring 32 to adapt more smoothly to the axial displacement of the connecting rod when it reciprocates with the connecting rod. This reduces the rigid friction between the elastic sealing ring 32 and the connecting rod, thereby reducing the resistance to the axial reciprocating motion of the connecting rod. It also reduces the excessive wear or fatigue failure of the sealing ring caused by the reciprocating motion of the connecting rod, further improving the reliability and durability of the dynamic seal.

[0040] like Figure 2As shown, the inner diameter of the elastic sealing ring 32 is smaller than the diameter of the connecting rod; the inner diameter of the annular sealing seat 31 is larger than the diameter of the connecting rod and smaller than the diameter of the first groove 121; the inner diameter of the second annular cover plate 33 is larger than the diameter of the connecting rod and smaller than the diameter of the second groove 311. The inner diameter of the elastic sealing ring 32 is slightly smaller than the diameter of the connecting rod, which creates an interference fit between the elastic sealing ring 32 and the connecting rod. After assembly, the elastic sealing ring 32 will tightly wrap around the connecting rod due to its elasticity, thus establishing a good sealing contact in the initial state and effectively preventing the medium inside and outside the test chamber from penetrating through the gap between them. At the same time, this interference fit can generate adaptive elastic deformation with the axial reciprocating motion of the connecting rod, always maintaining pressure on the surface of the connecting rod and ensuring the continuity of dynamic sealing. The inner diameter of the annular sealing seat 31 is larger than the diameter of the connecting rod, leaving enough space for the reciprocating motion of the connecting rod, avoiding direct friction between the annular sealing seat 31 and the connecting rod, thereby reducing the resistance to the movement of the connecting rod and ensuring the smoothness of the connecting rod movement. The inner diameter of the second annular cover plate 33 is smaller than the diameter of the first groove 121, allowing the annular sealing seat 31 to be stably housed within the first groove 121. This prevents positional displacement due to linkage movement or other external forces, providing a stable mounting base for the elastic sealing ring 32 and ensuring its proper sealing function. The inner diameter of the second annular cover plate 33 is larger than the diameter of the linkage, similarly avoiding direct contact with the linkage and preventing additional resistance to its reciprocating motion, thus ensuring uninterrupted linkage movement. Its inner diameter is smaller than the diameter of the second groove 311, allowing the second annular cover plate 33 to tightly cover the second groove 311, reliably pressing the elastic sealing ring 32 into the second groove 311 of the annular sealing seat 31. This prevents the elastic sealing ring 32 from loosening or falling off during linkage movement, further ensuring the stability and sealing performance of the sealing structure. The dimensions of these three components work together to enhance the sealing effect through the interference fit of the elastic sealing ring 32, reduce motion resistance by utilizing the reasonable gap between the annular sealing seat 31 and the second annular cover plate 33 and the connecting rod, and ensure the installation stability of each component. Together, they improve the reliability and practicality of the sealing structure during the axial reciprocating motion of the connecting rod.

[0041] In this embodiment, both the elastic sealing ring 32 and the annular sealing seat 31 are made of polytetrafluoroethylene (PTFE). PTFE is chemically stable, possessing extremely strong resistance to acids, alkalis, and organic solvents; it is almost insoluble in all solvents, exhibits excellent high-temperature resistance (stable at room temperature, decomposing only at temperatures above 450°C), has an extremely low coefficient of friction, and possesses natural lubricity; it also demonstrates outstanding low-temperature resistance, maintaining toughness at -196°C (liquid nitrogen temperature), strong electrical insulation, high aging resistance, and excellent chemical inertness. The physical and chemical properties of this material better meet the requirements of high-temperature, low-temperature, humid, and corrosive testing environments in environmental test chambers, as well as the reciprocating motion of the connecting rod.

[0042] like Figure 2 As shown, the inner diameter of the annular wool felt 21 is smaller than the diameter of the connecting rod; the inner diameter of the first annular cover plate 22 is larger than the diameter of the connecting rod but smaller than the outer diameter of the annular wool felt 21. The inner diameter of the annular wool felt 21 is slightly smaller than the diameter of the connecting rod, resulting in an interference fit after assembly. Due to the excellent thermal insulation properties, fiber elasticity, and density of the annular wool felt 21, it adheres tightly to the surface of the connecting rod, forming an initial sealing barrier that effectively prevents the flow of gas, moisture, and dust from inside and outside the test chamber through the gap. Simultaneously, when the connecting rod reciprocates axially, this interference fit causes the annular wool felt 21 to undergo adaptive deformation with the movement of the connecting rod, maintaining continuous close contact with the surface of the connecting rod. Utilizing the good wear resistance of the wool felt, it maintains stable sealing performance during dynamic movement, reducing seal failure caused by friction. The inner diameter of the first annular cover plate 22 is larger than the diameter of the connecting rod, which avoids direct contact between the first annular cover plate 22 and the connecting rod, thus preventing additional resistance to the axial reciprocating motion of the connecting rod, ensuring the smoothness of the connecting rod's movement, and reducing energy loss during the movement. Its inner diameter is smaller than the outer diameter of the annular wool felt 21, allowing the first annular cover plate 22 to apply pressure evenly to the edge area of ​​the annular wool felt 21 when pressing it, ensuring a tight fit between the annular wool felt 21 and the first end of the first sleeve 11, preventing displacement or warping of the annular wool felt 21 during the connecting rod's movement, further enhancing the sealing performance between the annular wool felt 21 and the first sleeve 11, and providing a stable structural support for the wool felt to perform its sealing function. The dimensions of the annular wool felt 21 and the first annular cover plate 22 are designed to complement each other. The interference fit between the annular wool felt 21 and the connecting rod enhances the dynamic sealing effect, while the size setting of the first annular cover plate 22 avoids interference with the movement of the connecting rod. At the same time, it ensures the installation stability of the annular wool felt 21, and together improves the reliability and practicality of the sealing structure during the reciprocating motion of the connecting rod.

[0043] like Figure 2As shown, the first sleeve 11 includes a connecting ring 112 and a tube body 111 that are connected to each other. The tube body 111 penetrates the box wall, and its first end is fixedly connected to the connecting ring 112. The connecting ring 112 abuts against the inner wall of the box 100. The second end of the tube body 111 is provided with an external thread, and the inner wall of the second sleeve 12 is provided with an internal thread. The second sleeve 12 is threadedly connected to the tube body 111. The first sleeve 11 is composed of the connecting ring 112 and the tube body 111 that are connected to each other. After the tube body 111 penetrates the box wall, the connecting ring 112 abuts against the inner wall of the box 100. This structural design can provide a stable support foundation for the connection between the sleeve assembly 1 and the box 100. The abutment between the connecting ring 112 and the inner wall of the box 100 can increase the contact area, disperse the pressure of the tube body 111 on the box wall, avoid damage to the box wall due to excessive local stress, and at the same time reduce the gap between the tube body 111 and the box wall, creating favorable conditions for subsequent sealing. The external thread at the second end of the tube 111 engages with the internal thread on the inner wall of the second sleeve 12 to achieve a threaded connection. This detachable connection not only facilitates the installation and disassembly of the sleeve assembly 1 and makes it convenient for later maintenance or replacement of the sealing structure, but also allows for adjustment of the connection tightness by adjusting the tightness of the threads. During tightening, the engagement between the threads ensures that the first sleeve 11 and the second sleeve 12 fit tightly together, reducing the gap between them, enhancing the overall sealing performance, and preventing unnecessary heat exchange or media flow between the simulated climate environment inside the environmental test chamber and the outside world. In addition, the design of the tube 111 penetrating the chamber wall ensures that the connecting rod can smoothly pass through the chamber 100, providing a channel for the connection between the connecting rod and the external drive mechanism, as well as for reciprocating motion inside and outside the chamber 100. The fixed connection between the connecting ring 112 and the tube 111 ensures the stability of the overall structure of the first sleeve 11, making the sleeve assembly 1 less prone to deformation or displacement under the force generated by the reciprocating motion of the connecting rod, further ensuring the reliability of the sealing structure.

[0044] In this embodiment, the inner diameter of the tube 111 is larger than the diameter of the connecting rod, and the first end of the tube 111 is connected to the connecting ring 112 by integral molding or welding. In this embodiment, the sleeve assembly 1 is made of plastic, which can effectively isolate heat conduction between the inside and outside of the environmental test chamber.

[0045] like Figure 2As shown, the first sealing assembly 2 also includes a first fastener 23. The first fastener 23 passes through the first annular cover plate 22, the annular felt 21, and the connecting ring 112 in sequence and is threadedly connected to the inner wall of the housing 100. The pre-tightening force of the first fastener 23 tightly presses the components together. This connection method ensures that the first annular cover plate 22 exerts uniform and continuous pressure on the annular felt 21, keeping the annular felt 21 tightly fitted to the end face of the connecting ring 112 and the surface of the connecting rod, thus enhancing the initial sealing effect and sealing stability during dynamic movement. Furthermore, the threaded connection between the first fastener 23 and the inner wall of the housing 100 firmly fixes the connecting ring 112 to the inner wall of the housing 100, preventing the sleeve assembly 1 from loosening due to vibrations caused by the reciprocating motion of the connecting rod, and ensuring the overall structural rigidity. Simultaneously, this through-type fastening structure facilitates disassembly and assembly. When the annular felt 21 needs replacement due to wear from long-term use, maintenance can be quickly completed by disassembling the fastener, balancing sealing reliability and maintenance convenience, further improving the practical performance of the sealing structure.

[0046] In this embodiment, as Figure 1 , Figures 4-6 As shown, the first sealing assembly 2 also includes four first fasteners 23, which are evenly distributed circumferentially along the first annular cover plate 22. These fasteners sequentially pass through the first annular cover plate 22, the annular felt 21, and the connecting ring 112, and are threadedly connected to the inner wall of the housing 100. This evenly distributed circumferential design ensures more balanced pressure from the first annular cover plate 22 on the annular felt 21, preventing uneven deformation of the felt due to excessive local pressure or sealing failure due to insufficient local pressure. This ensures a stable and comprehensive sealing contact between the annular felt 21 and the connecting rod and connecting ring 112. Specifically, the first fasteners 23 are bolts or screws.

[0047] like Figure 2 As shown, in one embodiment, the second sealing assembly 3 further includes an annular gasket 34, which is located between the second sleeve 12 and the second annular cover plate 33. The inner diameter of the annular gasket 34 is equal to the diameter of the second groove 311. The transitional action of the annular gasket 34 allows the clamping force of the second annular cover plate 33 to be transmitted more evenly to the lower sealing components (elastic sealing ring 32 and annular sealing seat 31), avoiding localized pressure concentration caused by direct contact between the second annular cover plate 33 and the second sleeve 12. When the inner diameter of the annular gasket 34 is equal to the diameter of the second groove 311, the annular gasket 34 can precisely cover the area of ​​the second groove 311, concentrating the pressure on the annular sealing seat 31 and the elastic sealing ring 32, strengthening the tightness of the fit between the elastic sealing ring 32 and the connecting rod and the bottom wall of the second groove 311, further improving the sealing effect.

[0048] In another embodiment, the inner diameter of the annular pad 34 is larger than the diameter of the second groove 311 and smaller than the diameter of the first groove 121. When the inner diameter of the annular pad 34 is larger than the diameter of the second groove 311 and smaller than the diameter of the first groove 121, the pad can simultaneously cover the annular sealing seat 31 and the edge of the first groove 121 of the second sleeve 12. While transmitting pressure to the sealing ring, it can also form a circumferential limit on the annular sealing seat 31, preventing it from radially shifting during the reciprocating motion of the connecting rod, thus enhancing the overall structural stability of the sealing assembly.

[0049] like Figure 2 As shown, the second sealing assembly 3 also includes a second fastener 35, which sequentially passes through the second annular cover plate 33, the annular pad 34, and the second sleeve 12, and is threadedly connected to the outer wall of the housing 100. The axial preload of the second fastener 35 tightly locks the components together as a whole. On one hand, it can evenly transmit the pressure of the second annular cover plate 33 to the elastic sealing ring 32 via the annular pad 34, ensuring a stable fit between the elastic sealing ring 32 and the connecting rod surface and the second groove 311 of the annular sealing seat 31, thus strengthening the pressure continuity of the sealing surface. Especially when designed with the V-groove 321, it can further stimulate the self-tightening effect of the elastic sealing ring 32. On the other hand, through the threaded connection to the outer wall of the housing 100, the second sleeve 12 can be firmly fixed to the housing 100, forming an internal and external correspondence with the inner fixing of the first sleeve 11, jointly enhancing the overall rigidity of the connection between the sleeve assembly 1 and the housing 100, effectively resisting the axial impact force generated by the reciprocating motion of the connecting rod, and preventing gaps between the sleeve assembly 1 and the housing wall. Meanwhile, this fastening method makes it easy to control the pre-tightening force, which can be flexibly adjusted according to sealing requirements. It is also easy to disassemble and assemble, providing convenience for the maintenance and replacement of the sealing structure. Overall, the rigid fixation of the structure and the precise transmission of pressure ensure the long-term reliability of the dynamic seal.

[0050] In this embodiment, the second sealing assembly 3 further includes four second fasteners 35, which are evenly distributed circumferentially along the second annular cover plate 33. These fasteners sequentially pass through the second annular cover plate 33, the annular pad 34, and the second sleeve 12, and are threadedly connected to the outer wall of the housing 100. This evenly distributed circumferential layout allows the pressure of the second annular cover plate 33 on the annular pad 34 to be transmitted more evenly to the elastic sealing ring 32, preventing excessive deformation of the elastic sealing ring 32 due to excessive local pressure or sealing failure due to insufficient local pressure. This ensures a stable and comprehensive sealing contact between the elastic sealing ring 32 and the connecting rod and the second groove 311 of the annular sealing seat 31. Specifically, the second fasteners 35 are bolts or screws.

[0051] like Figure 2 and Figure 4As shown, the sleeve assembly 1 includes a third fastener 36, which passes through the bottom wall of the first groove 121 and is threadedly connected to the outer wall of the housing 100. The first groove 121 serves as the accommodating space for the annular sealing seat 31. The connection between its bottom wall and the outer wall of the housing 100 is reinforced by the third fastener 36, which effectively resists various forces transmitted to the second sleeve 12 during the reciprocating motion of the connecting rod, preventing the second sleeve 12 from loosening due to long-term stress on the housing 100, thereby ensuring the stability of the connection between the sleeve assembly 1 and the housing 100. At the same time, the setting of the third fastener 36 works synergistically with the second fastener 35 of the second sealing assembly 3, fixing the second sleeve 12 from different positions, making the constraint force on the second sleeve 12 more balanced, reducing the possibility of deformation due to uneven stress, and thus ensuring the installation accuracy of components such as the annular sealing seat 31 and the elastic sealing ring 32, ensuring that the elastic sealing ring 32 can always maintain a good sealing contact with the connecting rod.

[0052] like Figure 4 As shown, the sleeve assembly 1 includes four third fasteners 36, which are countersunk screws. The four countersunk screws are evenly distributed circumferentially along the bottom wall of the first groove 121 and threadedly connected to the outer wall of the housing 100 through the bottom wall of the first groove 121. The four evenly distributed countersunk screws can reinforce the connection between the second sleeve 12 and the housing 100 from multiple circumferential points. Compared with a single fastener, this distribution method allows the constraint force to act more evenly on the second sleeve 12, greatly improving the overall stability of the connection between the second sleeve 12 and the housing 100. It can more effectively resist the radial and axial forces transmitted to the second sleeve 12 by the reciprocating motion of the connecting rod, and prevent the second sleeve 12 from loosening or deviating due to excessive local stress, further ensuring the reliability of the connection between the sleeve assembly 1 and the housing 100. Using countersunk screws can prevent the head of the third fastener 36 from protruding from the bottom wall surface of the first groove 121, thus avoiding interference with the annular sealing seat 31 housed in the first groove 121. This ensures that the annular sealing seat 31 can be installed smoothly and fit tightly against the bottom wall of the first groove 121, providing a stable support foundation for the elastic sealing ring 32.

[0053] The installation process of the sealing structure in this embodiment is as follows: A box wall hole is opened in the box wall of the box body 100. The tube body 111 of the first sleeve 11 is inserted into the box wall hole and then threadedly connected to the second sleeve 12. Then, the third fastener 36 is inserted through the bottom wall of the first groove 121 and connected to the outer wall of the box body 100. Subsequently, the annular sealing seat 31 and the elastic sealing ring 32 are placed in the first groove 121 in sequence. The second annular cover plate 33, the annular pad 34, and the second sleeve 12 are fixed to the outer wall of the box body 100 by the second fastener 35. Then, the first annular cover plate 22 and the annular wool felt 21 are fixed to the inner wall of the box body 100 by the first fastener 23. After the installation is completed, the connecting rod is inserted through the sealing structure and connected to the external drive mechanism.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sealing structure for sealing between the wall of a hole in the wall of a housing (100) and a connecting rod penetrating the hole, characterized in that, The sealing structure includes: The sleeve assembly (1) includes a first sleeve (11) and a second sleeve (12). The first sleeve (11) passes through the box wall hole and its first end is fixedly connected to the inner wall of the box body (100). Its second end is detachably connected to the second sleeve (12). The second sleeve (12) is fixedly connected to the outer wall of the box body (100). The first sealing assembly (2) includes an annular wool felt (21) and a first annular cover plate (22), wherein the first annular cover plate (22) presses the annular wool felt (21) against the first end of the first sleeve (11); The second sealing assembly (3) includes an annular sealing seat (31), an elastic sealing ring (32), and a second annular cover plate (33). The second sleeve (12) has a first groove (121) along the axial direction at one end away from the first sleeve (11). The first groove (121) is used to accommodate the annular sealing seat (31). The annular sealing seat (31) has a second groove (311). The second annular cover plate (33) covers the elastic sealing ring (32) in the second groove (311) and is fixedly connected to the second sleeve (12). The annular felt (21) and the elastic sealing ring (32) respectively form a two-end seal between the connecting rod and the sleeve assembly (1).

2. The sealing structure according to claim 1, characterized in that, The elastic sealing ring (32) is provided with a V-shaped groove (321), which is located on the end face of the elastic sealing ring (32) that abuts against the bottom wall of the second groove (311).

3. The sealing structure according to claim 1, characterized in that, The inner diameter of the elastic sealing ring (32) is smaller than the diameter of the connecting rod; the inner diameter of the annular sealing seat (31) is larger than the diameter of the connecting rod and smaller than the diameter of the first groove (121); the inner diameter of the second annular cover plate (33) is larger than the diameter of the connecting rod and smaller than the diameter of the second groove (311).

4. The sealing structure according to claim 1, characterized in that, The inner diameter of the annular wool felt (21) is smaller than the diameter of the connecting rod; the inner diameter of the first annular cover plate (22) is larger than the diameter of the connecting rod and smaller than the outer diameter of the annular wool felt (21).

5. The sealing structure according to claim 1, characterized in that, The first sleeve (11) includes a connecting ring (112) and a tube body (111) that are connected to each other. The tube body (111) penetrates the box wall. The first end of the tube body (111) is fixedly connected to the connecting ring (112). The connecting ring (112) abuts against the inner wall of the box body (100). The second end of the tube body (111) is provided with an external thread. The inner wall of the second sleeve (12) is provided with an internal thread. The second sleeve (12) is threadedly connected to the tube body (111).

6. The sealing structure according to claim 5, characterized in that, The first sealing assembly (2) further includes a first fastener (23), which passes through the first annular cover plate (22), the annular wool felt (21), and the connecting ring (112) in sequence and is threadedly connected to the inner wall of the box body (100).

7. The sealing structure according to claim 1, characterized in that, The second sealing assembly (3) further includes an annular gasket (34) located between the second sleeve (12) and the second annular cover plate (33). The inner diameter of the annular gasket (34) is equal to the diameter of the second groove (311); or, the inner diameter of the annular gasket (34) is greater than the diameter of the second groove (311) and smaller than the diameter of the first groove (121).

8. The sealing structure according to claim 7, characterized in that, The second sealing assembly (3) further includes a second fastener (35), which passes through the second annular cover plate (33), the annular pad plate (34), and the second sleeve (12) in sequence and is threadedly connected to the outer wall of the housing (100).

9. The sealing structure according to claim 1, characterized in that, The sleeve assembly (1) includes a third fastener (36) which passes through the bottom wall of the first groove (121) and is threadedly connected to the outer wall of the housing (100).

10. An environmental test chamber, characterized in that, The device includes a housing (100) and a sealing structure as described in any one of claims 1-9. The housing (100) has a housing wall hole, and the sealing structure passes through the housing wall hole and is sealed to the wall of the housing wall hole. The sealing structure is used to seal the gap between the connecting rod passing through the housing wall hole and the housing (100). The connecting rod passes through the sealing structure and is capable of reciprocating along its axial direction.

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