Window sealing device of high-low-temperature damp-heat low-pressure test box

Abstract

The utility model relates to the technical field of environmental test equipment, and particularly discloses a window sealing device of a high-low temperature damp-heat low-pressure test box, which comprises a window frame, and a multi-sealing component, an elastic component and a buffer layer are arranged on the inner wall of the window frame; the multi-sealing assembly is composed of an outer-layer sealing ring, an inner-layer sealing ring and a middle supporting ring, the elastic assembly comprises a plurality of annular spring sets which are arranged on the outer wall of the extension plate and are annularly distributed, and the outer-layer sealing ring resists high temperature, chemical corrosion and friction loss and bears external environment pressure; low-temperature elastic compensation and deformation self-adaption capacity are provided through the inner-layer sealing ring, stress is dispersed in the middle of the supporting ring, the situation that single-layer sealing loses efficacy due to local overload is avoided, and therefore multi-layer sealing protection is achieved. The pre-tightening force of the annular spring set is transmitted to the supporting ring through the inner-layer sealing ring, overall supporting of the sealing structure is formed, and the annular array design of the annular spring set ensures that the pressure of the sealing face is evenly distributed.

Description

Technical Field

[0001] This utility model relates to the field of environmental testing equipment technology, and specifically discloses a window sealing device for a high and low temperature humidity and low pressure test chamber. Background Technology

[0002] A high and low temperature humidity and low pressure test chamber is a testing device used to simulate extreme environmental conditions. It is primarily used to test and verify the performance and reliability of various products under high temperature, low temperature, humidity, and low pressure environments. High and low temperature humidity and low pressure test chambers are suitable for testing the performance indicators of aerospace products, automotive manufacturing, information electronic instruments, materials, electrical and electronic products, and various electronic components under high temperature, low temperature, or humidity environments.

[0003] Traditional rubber sealing rings are prone to deformation after expanding at high temperatures and contracting at low temperatures, resulting in poor sealing. Conventional single-layer seals are prone to gaps under low pressure due to the pressure difference between the inside and outside, causing leakage in the low-pressure environment. The glass and metal frame are prone to cracking due to the difference in thermal expansion coefficients. Therefore, a window sealing device for high and low temperature humidity and low pressure test chambers is needed to solve this problem. Utility Model Content

[0004] This invention proposes a window sealing device for a high and low temperature humidity and low pressure test chamber, which can achieve multi-layer sealing protection and ensure uniform pressure distribution on the sealing surface; by using a flexible graphite gasket in combination with silicone thermally conductive adhesive, thermal stress can be dispersed, thereby achieving an anti-crack effect and extending the service life of the window glass.

[0005] This utility model is implemented as follows: a window sealing device for a high and low temperature humidity and low pressure test chamber includes a test chamber, a door panel is provided on the front end of the test chamber, a window frame is embedded and welded into the outer wall of the door panel, and multiple sealing components, elastic components and buffer layers are provided on the inner wall of the window frame.

[0006] The multi-sealing assembly consists of an outer sealing ring, an inner sealing ring, and a middle support ring, with the inner sealing ring located on the side closest to the door panel.

[0007] The elastic component includes an extension plate fixedly connected to the rear end face of the window frame, a plurality of annular spring groups disposed on the outer wall of the extension plate and distributed in a ring, and a silicone gasket installed at the other end of the annular spring groups and abutting against the inner sealing ring.

[0008] The buffer layer includes a window glass installed inside the window frame and located in front of the outer sealing ring, and a flexible graphite gasket is wrapped around the outer edge of the window glass.

[0009] As a preferred embodiment of the window sealing device of the high and low temperature humidity and low pressure test chamber of this utility model, the inner wall of the window frame is provided with a mounting groove for installing the window glass, and the space between the window glass and the mounting groove is filled with silicone thermally conductive adhesive.

[0010] As a preferred embodiment of the window sealing device of the high and low temperature humidity and low pressure test chamber of this utility model, the inner wall of the window frame is provided with a stepped groove for installing a support ring, and the outer wall of the support ring is fixedly connected with a flange that is interference-fitted with the stepped groove.

[0011] As a preferred embodiment of the window sealing device of the high and low temperature humidity and low pressure test chamber of this utility model, the outer wall of the door panel is provided with a pressure balance channel with a built-in one-way valve.

[0012] As a preferred embodiment of the window sealing device of the high and low temperature humidity and low pressure test chamber of this utility model, the support ring is made of a rigid metal structure.

[0013] As a preferred embodiment of the window sealing device of the high and low temperature humidity and low pressure test chamber of this utility model, the outer sealing ring is made of fluororubber and the inner sealing ring is made of silicone rubber.

[0014] The beneficial effects of this utility model are:

[0015] 1. The outer sealing ring serves as the first line of defense, resisting high temperature, chemical corrosion and frictional wear, and withstanding external environmental pressure. The inner sealing ring serves as the second line of defense, providing low-temperature elastic compensation and deformation self-adaptation capabilities to cope with pressure differential loads caused by low air pressure inside the box. The support ring is centrally located to disperse stress and prevent single-layer seal failure due to local overload, thereby achieving multi-layer sealing protection.

[0016] 2. The preload of the ring spring assembly is transmitted to the support ring through the inner sealing ring, forming an overall support for the sealing structure and ensuring a tight fit with the outer sealing ring. The ring array design of the ring spring assembly ensures uniform pressure distribution on the sealing surface.

[0017] 3. By setting flexible graphite pads and silicone thermally conductive adhesive at the outer edge of the window glass, thermal stress can be dispersed, thereby achieving the effect of preventing cracking and extending the service life of the window glass. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is an overall structural diagram of the window sealing device of a high and low temperature humidity and low pressure test chamber according to this utility model.

[0020] Figure 2 This is a front sectional view of the door panel of this utility model.

[0021] Figure 3 This is a structural diagram of the multi-layer sealing assembly of this utility model.

[0022] Figure 4 This is a structural diagram of the viewing glass of this utility model.

[0023] The markings in the diagram are: 1. Test chamber; 2. Door panel; 201. Air pressure balance channel; 3. Window frame; 301. Mounting groove; 302. Step groove; 303. Extension plate; 304. Ring spring assembly; 305. Silicone gasket; 4. Support ring; 401. Flange; 402. Outer sealing ring; 403. Inner sealing ring; 5. Window glass; 501. Flexible graphite gasket. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-4 A window sealing device for a high and low temperature humidity and low pressure test chamber includes a test chamber 1, a door panel 2 is provided on the front end of the test chamber 1, a window frame 3 is embedded and welded into the outer wall of the door panel 2, and the inner wall of the window frame 3 is provided with multiple sealing components, elastic components and buffer layers.

[0026] The multi-sealing assembly consists of an outer sealing ring 402, an inner sealing ring 403, and a middle support ring 4. The inner sealing ring 403 is located on the side closest to the door panel 2.

[0027] The elastic component includes an extension plate 303 fixedly connected to the rear end face of the window frame 3, a plurality of annular spring groups 304 disposed on the outer wall of the extension plate 303 and distributed in a ring, and a silicone gasket 305 installed at the other end of the annular spring group 304 and abutting against the inner sealing ring 403.

[0028] The buffer layer includes a window glass 5 installed inside the window frame 3 and located in front of the outer sealing ring 402, and a flexible graphite gasket 501 is wrapped around the outer edge of the window glass 5.

[0029] In this embodiment: the outer sealing ring 402 serves as the first line of defense, resisting high temperature, chemical corrosion (humid heat condensate, test medium) and frictional loss, and withstanding external environmental pressure (such as atmospheric pressure). The inner sealing ring 403 serves as the second line of defense, providing low temperature elastic compensation and deformation self-adaptation capability to cope with the pressure difference load caused by low air pressure inside the chamber. The support ring 4 is centrally located to disperse stress, preventing single-layer seal failure due to local overload, thereby achieving multi-layer sealing protection.

[0030] The end of the annular spring assembly 304 contacts the inner sealing ring 403 through the silicone gasket 305, which can apply an outward pushing force. The preload of the annular spring assembly 304 is transmitted to the support ring 4 through the inner sealing ring 403, forming an overall support for the sealing structure and making it fit tightly with the outer sealing ring 402. The annular array design of the annular spring assembly 304 ensures uniform pressure distribution on the sealing surface.

[0031] By setting a flexible graphite pad 501 at the outer edge of the window glass 5 in combination with silicone thermally conductive adhesive, thermal stress can be dispersed, thereby achieving the effect of crack resistance and extending the service life of the window glass 5.

[0032] As a technical optimization of this utility model, the inner wall of the window frame 3 is provided with a mounting groove 301 for mounting the window glass 5, and the space between the window glass 5 and the mounting groove 301 is filled with silicone thermally conductive adhesive.

[0033] In this embodiment, the gap between the viewing window glass 5 and the mounting groove 301 can be filled with silicone thermal conductive adhesive to reduce local temperature differences.

[0034] As a technical optimization of this utility model, the inner wall of the window frame 3 is provided with a stepped groove 302 for installing the support ring 4, and the outer wall of the support ring 4 is fixedly connected with a flange 401 that is interference-fitted with the stepped groove 302.

[0035] In this embodiment: the edge of the support ring 4 is formed into a matching flange 401 by precision machining, and after being embedded in the stepped groove 302, it is physically fixed by interference fit.

[0036] As a technical optimization of this utility model, the outer wall of the door panel 2 is provided with a pressure balance channel 201 with a built-in one-way valve.

[0037] In this embodiment: the pressure difference between the inside and outside of the test chamber 1 can be balanced through the air pressure balance channel 201, specifically by adjusting the pressure difference through a one-way valve to reduce the stress on the sealing ring.

[0038] As a technical optimization of this utility model, the support ring 4 is made of a rigid metal structure.

[0039] In this embodiment, the support ring 4 is made of a rigid metal structure and is placed between the two sealing rings to prevent the sealing rings from being squeezed and collapsed by the external atmospheric pressure under low air pressure.

[0040] As a technical optimization of this utility model, the outer sealing ring 402 is made of fluororubber, and the inner sealing ring 403 is made of silicone rubber.

[0041] In this embodiment: the outer sealing ring 402 is made of fluororubber and is located on the outside of the stepped groove 302. It is resistant to high temperature and chemical corrosion. The inner sealing ring 403 is made of silicone rubber and is located on the inside of the stepped groove 302. It has high elasticity to compensate for deformation.

[0042] The working principle and usage process of this utility model are as follows: The outer sealing ring 402 serves as the first line of defense, resisting high temperature, chemical corrosion (humid heat condensate, test medium) and frictional loss, and withstanding external environmental pressure (such as atmospheric pressure). The inner sealing ring 403 serves as the second line of defense, providing low temperature elastic compensation and deformation self-adaptation capability to cope with the pressure difference load caused by low air pressure inside the chamber. The support ring 4 is centrally located to disperse stress, avoiding single-layer seal failure due to local overload, thereby achieving multi-layer sealing protection.

[0043] The end of the annular spring assembly 304 contacts the inner sealing ring 403 via a silicone gasket 305, which can apply an outward thrust. The preload of the annular spring assembly 304 is transmitted to the support ring 4 through the inner sealing ring 403, forming an overall support for the sealing structure and ensuring a tight fit with the outer sealing ring 402. The annular array design of the annular spring assembly 304 ensures uniform pressure distribution on the sealing surface. When the sealing ring shrinks due to low temperature, the annular spring assembly 304 continuously applies an outward thrust through the silicone gasket 305 to fill the gap between the sealing ring and the frame. When the sealing ring expands due to high temperature, it is compressed. The preload is adaptively adjusted to prevent the sealing ring from being over-compressed and failing. When the pressure inside the test chamber 1 is lower than that outside, the support ring 4 resists the external atmospheric pressure, and the annular spring assembly 304 simultaneously increases the thrust to prevent leakage due to inward concavity of the sealing ring.

[0044] By setting a flexible graphite pad 501 at the outer edge of the window glass 5 in combination with silicone thermally conductive adhesive, thermal stress can be dispersed, thereby achieving the effect of crack resistance and extending the service life of the window glass 5.

[0045] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0046] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A window sealing device for a high and low temperature humidity and low pressure test chamber, comprising a test chamber (1), wherein a door panel (2) is provided on the front end face of the test chamber (1), characterized in that: The outer wall of the door panel (2) is embedded with a window frame (3), and the inner wall of the window frame (3) is provided with multiple sealing components, elastic components and buffer layers; The multi-seal assembly consists of an outer sealing ring (402), an inner sealing ring (403), and a middle support ring (4), with the inner sealing ring (403) located on the side closer to the door panel (2). The elastic component includes an extension plate (303) fixedly connected to the rear end face of the window frame (3), a plurality of annular spring groups (304) disposed on the outer wall of the extension plate (303) and distributed in a ring, and a silicone gasket (305) installed at the other end of the annular spring group (304) and abutting against the inner sealing ring (403). The buffer layer includes a window glass (5) installed inside the window frame (3) and located in front of the outer sealing ring (402), and a flexible graphite gasket (501) is wrapped around the outer edge of the window glass (5).

2. The window sealing device of a high and low temperature humidity and low pressure test chamber according to claim 1, characterized in that: The inner wall of the window frame (3) is provided with a mounting groove (301) for installing the window glass (5), and the space between the window glass (5) and the mounting groove (301) is filled with silicone thermally conductive adhesive.

3. The window sealing device of a high and low temperature humidity and low pressure test chamber according to claim 1, characterized in that: The inner wall of the window frame (3) is provided with a stepped groove (302) for installing the support ring (4), and the outer wall of the support ring (4) is fixedly connected with a flange (401) that is interference-fitted with the stepped groove (302).

4. The window sealing device of a high and low temperature humidity and low pressure test chamber according to claim 1, characterized in that: The outer wall of the door panel (2) is equipped with a pressure balance channel (201) with a built-in one-way valve.

5. The window sealing device of a high and low temperature humidity and low pressure test chamber according to claim 1, characterized in that: The support ring (4) is made of a rigid metal structure.

6. The window sealing device of a high and low temperature humidity and low pressure test chamber according to claim 1, characterized in that: The outer sealing ring (402) is made of fluororubber, and the inner sealing ring (403) is made of silicone rubber.

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