Sealing device and sealing method for external cable of low-pressure test box

Abstract

The invention provides a sealing device for an external cable of a low-pressure test box, and relates to the technical field of cable sealing. The second air bag clamps the bracket; the inner side annular air bag is used for sealing between the cable and the inner wall of the cylindrical structure; the outer side annular air bag is arranged outside the cylindrical structure and used for sealing between the cylindrical structure and the inner wall of the operation hole of the low-pressure test box, the inner side annular air bag is provided with an inner side annular air bag air inlet valve used for inflation and deflation, and the position of the inner side annular air bag air inlet valve corresponds to the position of the second through hole; the outer side annular air bag is provided with an outer side annular air bag air inlet valve used for inflation and deflation, and the outer cover plate is provided with a third through hole used for exposing the outer side annular air bag air inlet valve. The device solves the problem that an external cable of an electronic product in a low-pressure test is not tightly sealed, can adapt to operation holes with different hole diameters during the low-pressure test, and realizes rapid sealing of the external cable at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of cable sealing, and in particular provides a sealing device and a sealing method for an external cable of a low pressure test box. Background Art

[0002] When electronic products are in low-pressure environments, such as flying on airplanes or working in high-altitude areas, the sealed containers may deform, break, and crack, and the physical and chemical properties of low-density materials may change, which may affect the product performance. Therefore, low-pressure tests must be conducted when evaluating the performance of electronic products working in low-pressure environments. During the test, cables usually need to pass through the operating holes of the test box to connect the electronic products 101 inside and outside the test box with the test equipment 102. The cable sealing problem at the operating hole becomes a difficult problem that affects the effect of the low-pressure test. Common methods such as potting cables and glue sealing require specially made custom cables or damage the original cables, which cannot be used for other tests, resulting in a large waste of resources.

[0003] Therefore, it is necessary to provide an economical, convenient and universal low-pressure test cable sealing method to achieve the sealing of the cable in the operating hole of the test box. Summary of the invention

[0004] The purpose of the present application is to provide a sealing device for external cables of a low-pressure test box, so as to solve the problem of poor sealing of external cables during low-pressure tests of electronic products.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A sealing device for an external cable of a low pressure test box, the sealing device comprising:

[0007] A first airbag clamping bracket, the first airbag clamping bracket comprises an integrally formed inner cover plate and an internal hollow cylindrical structure, the inner cover plate has a diameter greater than the diameter of the low pressure test box operation hole, the outer diameter of the cylindrical structure is smaller than the inner diameter of the low pressure test box operation hole, and the inner cover plate is provided with a first through hole for the cable to pass through;

[0008] The second airbag clamping bracket is an outer cover plate provided with a second through hole for passing the cable, the diameter of the outer cover plate is larger than the diameter of the operation hole of the low pressure test box, and the second airbag clamping bracket is detachably connected to the first airbag clamping bracket;

[0009] An inner annular air bag is arranged in the cylindrical structure and is used for sealing between the cable and the inner wall of the cylindrical structure;

[0010] The outer annular airbag is arranged outside the cylindrical structure and is used to seal between the cylindrical structure and the inner wall of the operation hole of the low pressure test box.

[0011] The inner annular airbag is provided with an inner annular airbag inlet valve for inflation and deflation, and the position of the inner annular airbag inlet valve corresponds to the second through hole;

[0012] The outer annular airbag is provided with an outer annular airbag inlet valve for inflation and deflation, and the outer cover plate is provided with a third through hole for leaking out the outer annular airbag inlet valve.

[0013] The sealing device for the external cable of the low-pressure test box provided by the present invention also has the characteristic that the length of the cylindrical structure of the first airbag clamping bracket is not greater than the thickness of the low-pressure test box.

[0014] The sealing device for the external cable of the low pressure test box provided by the present invention also has the feature that the tubular structure of the second air bag clamping bracket is connected to the first air bag clamping bracket by a fastening screw.

[0015] The sealing device for the external cable of the low pressure test box provided by the present invention also has the following characteristics: the first airbag clamping bracket and the second airbag clamping bracket are made of 2A02 aluminum alloy or 304 stainless steel;

[0016] The inner annular airbag and the outer annular airbag are made of thermoplastic polyurethane elastomer.

[0017] The sealing device for the external cable of the low pressure test box provided by the present invention also has the following characteristics: the diameter of the first through hole is not less than the diameter of the cable, and the difference between the diameter of the first through hole and the diameter of the cable is not greater than 1 cm;

[0018] The diameter of the second through hole is not less than the sum of the diameter of the cable and the diameter of the inner annular airbag intake valve, and the difference between the diameter of the second through hole and the sum of the diameter of the cable and the diameter of the inner annular airbag intake valve is not greater than 1 cm.

[0019] The sealing device for external cables of the low-pressure test box provided by the present invention also has the characteristic that the diameters of the inner cover plate and the outer cover plate are not greater than three times the diameter of the operating hole of the low-pressure test box.

[0020] The second object of the present invention is to provide a method for sealing an external cable of a low pressure test box, the method using a sealing device as described in any one of the above, comprising the following steps:

[0021] The outer annular airbag is installed on the outer side of the first airbag clamping bracket, and the inner annular airbag is installed on the inner side of the first airbag clamping bracket;

[0022] Insert the first airbag clamping bracket after installing the airbag into the operation hole of the low pressure test box;

[0023] The cable is surface treated to ensure close contact with the inner annular air bag;

[0024] Insert the cable into the inner annular airbag and adjust the cable length inside and outside the test box to meet the test requirements;

[0025] Install the second airbag clamping bracket and connect the second airbag clamping bracket to the first airbag clamping bracket using fastening screws;

[0026] The inner and outer annular airbags are inflated in sequence until the air pressure reaches the set value to complete the sealing.

[0027] The sealing method provided by the present invention also has the following feature: the surface treatment of the cable includes: cleaning the contaminants on the cable surface and smoothing the concave surface.

[0028] The sealing method provided by the present invention also has the feature that the concave surface smoothing treatment includes leveling with organic cement or inorganic cement.

[0029] Beneficial Effects

[0030] The sealing device provided by the present invention can solve the problem of poor sealing of external cables in low-pressure tests of electronic products. It can adapt to operation holes of different diameters during low-pressure tests and realize rapid sealing of external cables. In addition, when the low-pressure test is completed or the length of the cables inside and outside the test box needs to be temporarily adjusted, the air pressure of the inner annular airbag can be controlled to realize rapid disassembly and adjustment of the cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of the working of the low pressure test external cable sealing device provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the mounting surface structure of a low-pressure test external cable sealing device provided by an embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram of the installation of an external cable sealing device for low-pressure testing provided by an embodiment of the present invention;

[0035] Figure 4 A flowchart of a low pressure test external cable sealing method provided by an embodiment of the present invention,

[0036] Among them, 1. outer annular airbag; 2. inner annular airbag; 3. cable; 4. first airbag clamping bracket; 41: inner cover plate; 42: cylindrical structure; 5. low pressure test chamber; 6. second airbag clamping bracket; 7. outer annular airbag intake valve; 8. inner annular airbag intake valve; 9. fastening screws; 101. electronic products; 102. testing equipment. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0038] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0039] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0040] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0041] like Figure 1-3 As shown, an embodiment of the present application provides a sealing device for an external cable of a low pressure test box, the sealing device comprising:

[0042] A first airbag clamping bracket 4, the first airbag clamping bracket 4 comprises an integrally formed inner cover plate 41 and an inner hollow cylindrical structure 42, the inner cover plate 41 has a diameter larger than the operating hole diameter of the low pressure test box 5, the outer diameter of the cylindrical structure 42 is smaller than the inner diameter of the operating hole of the low pressure test box 5, and the inner cover plate 41 is provided with a first through hole for the cable 3 to pass through;

[0043] The second airbag clamping bracket 6 is an outer cover plate provided with a second through hole through which the cable 3 passes, the diameter of the outer cover plate is larger than the diameter of the operation hole of the low pressure test box 5, and the second airbag clamping bracket 6 is detachably connected to the first airbag clamping bracket 4;

[0044] The inner annular airbag 2 is arranged in the cylindrical structure 42 and is used for sealing between the cable 3 and the inner wall of the cylindrical structure 42;

[0045] The outer annular airbag 1 is arranged outside the cylindrical structure 42 and is used to seal between the cylindrical structure 42 and the inner wall of the operating hole of the low pressure test box 5.

[0046] The inner annular airbag 2 is provided with an inner annular airbag inlet valve 8 for inflation and deflation, and the position of the inner annular airbag inlet valve 8 corresponds to the second through hole;

[0047] The outer annular airbag 1 is provided with an outer annular airbag inlet valve 7 for inflation and deflation, and the outer cover plate is provided with a third through hole for leaking the outer annular airbag inlet valve 7 .

[0048] In some embodiments, the length of the cylindrical structure 42 of the first airbag clamping bracket 4 is not greater than the thickness of the low-pressure test box 5 .

[0049] In some embodiments, the second airbag clamping bracket 6 is connected to the cylindrical structure 42 of the first airbag clamping bracket 4 by fastening screws 9. The fastening screws 9 are evenly distributed on the second airbag clamping bracket 6, ensuring that the sealing device is evenly stressed around the fastening screws 9 when under pressure, and the second airbag clamping bracket 6 is not prone to slight warping due to local stress concentration to affect the sealing performance.

[0050] In some embodiments, the first airbag clamping bracket 4 and the second airbag clamping bracket 6 are made of 2A02 aluminum alloy or 304 stainless steel; the inner annular airbag 2 and the outer annular airbag 1 are made of thermoplastic polyurethane elastomer. 2A02 aluminum alloy or 304 stainless steel has high rigidity and hardness, which ensures that the device will not be separated from the operating hole or produce large deformation under high negative pressure in the low-pressure test box, resulting in sealing failure. Thermoplastic polyurethane elastomer has good wear resistance and tear resistance, which ensures that the air pressure in the airbag can meet the sealing requirements and the airbag will not break due to wear during long-term use.

[0051] In some embodiments, the diameter of the first through hole is not less than the diameter of the cable 3, and the difference between the diameter of the first through hole and the diameter of the cable 3 is not greater than 1 cm;

[0052] The diameter of the second through hole is not less than the sum of the diameter of the cable 3 and the diameter of the inner annular airbag intake valve 8, and the difference between the diameter of the second through hole and the sum of the diameter of the cable 3 and the diameter of the inner annular airbag intake valve 8 is not greater than 1 cm.

[0053] In some embodiments, the diameters of the inner cover plate 41 and the outer cover plate are not greater than three times the diameter of the operating hole of the low pressure test box 5 .

[0054] In some embodiments, Figure 4 As shown, a method for sealing an external cable of a low pressure test box is provided, the method adopting a sealing device as described in any of the above embodiments, comprising the following steps:

[0055] The outer annular airbag 1 is installed on the outer side of the first airbag clamping bracket 4, and the inner annular airbag 2 is installed on the inner side of the first airbag clamping bracket 4. Adhesives such as vacuum grease can be added to the contact surface between the airbag and the clamping bracket to increase the sealing between the contact surfaces;

[0056] Insert the first airbag clamping bracket 4 with the airbag installed into the operating hole of the low-pressure test box 5. Before inserting, the operating hole wall needs to be cleaned to prevent residual debris and corrosive substances from damaging the outer annular airbag in daily tests;

[0057] The cable 3 is surface treated so as to be in close contact with the inner annular airbag 2;

[0058] Insert the cable 3 into the inner annular airbag 2, and adjust the length of the cable 3 inside and outside the low pressure test box 5 to meet the test requirements;

[0059] Install the second airbag clamping bracket 6, and use the fastening screws 9 to connect the second airbag clamping bracket 6 to the first airbag clamping bracket 4. The number of fastening screws 9 can be adjusted according to the diameter of the first airbag clamping bracket 4 to ensure the rigidity and strength of the structure;

[0060] Inflate the inner and outer annular airbags in sequence to make the air pressure reach the set value. The air pressure setting value should be pre-tested before the initial low-pressure test. When the air pressure inside the airbag reaches a value that makes the external cable 3 unable to move freely, increase the air pressure in the airbag gradually to make the low-pressure test box 5 work normally. Stop increasing the air pressure. This air pressure value is set as the set value to complete the sealing.

[0061] In some embodiments, the surface treatment of the cable 3 includes: cleaning the surface of the cable 3 from pollutants and smoothing the concave surface. The surface treatment of the cable 3 can prevent the cable 3 from damaging the inner annular airbag 2, further improving the sealing effect.

[0062] In some embodiments, the concave surface smoothing treatment includes leveling with organic cement or inorganic cement.

[0063] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A sealing device for an external cable of a low pressure test box, characterized in that: The sealing device comprises: A first airbag clamping bracket, the first airbag clamping bracket comprises an integrally formed inner cover plate and an internal hollow cylindrical structure, the inner cover plate has a diameter greater than the diameter of the low pressure test box operation hole, the outer diameter of the cylindrical structure is smaller than the inner diameter of the low pressure test box operation hole, and the inner cover plate is provided with a first through hole for the cable to pass through; The second airbag clamping bracket is an outer cover plate provided with a second through hole for passing the cable, the diameter of the outer cover plate is larger than the diameter of the operation hole of the low pressure test box, and the second airbag clamping bracket is detachably connected to the first airbag clamping bracket; An inner annular air bag is arranged in the cylindrical structure and is used for sealing between the cable and the inner wall of the cylindrical structure; The outer annular airbag is arranged outside the cylindrical structure and is used to seal between the cylindrical structure and the inner wall of the operation hole of the low pressure test box. The inner annular airbag is provided with an inner annular airbag inlet valve for inflation and deflation, and the position of the inner annular airbag inlet valve corresponds to the second through hole; The outer annular airbag is provided with an outer annular airbag inlet valve for inflation and deflation, and the outer cover plate is provided with a third through hole for leaking out the outer annular airbag inlet valve.

2. The sealing device for the external cable of the low pressure test box according to claim 1 is characterized in that: The length of the cylindrical structure of the first airbag clamping bracket is not greater than the thickness of the low pressure test box.

3. The sealing device for the external cable of the low pressure test box according to claim 1, characterized in that: The second airbag clamping bracket is connected to the tubular structure of the first airbag clamping bracket by fastening screws.

4. The sealing device for external cables of a low pressure test box according to claim 1, characterized in that: The first airbag clamping bracket and the second airbag clamping bracket are made of 2A02 aluminum alloy or 304 stainless steel; The inner annular airbag and the outer annular airbag are made of thermoplastic polyurethane elastomer.

5. The sealing device for external cables of a low pressure test box according to claim 1, characterized in that: The diameter of the first through hole is not less than the diameter of the cable, and the difference between the diameter of the first through hole and the diameter of the cable is not greater than 1 cm; The diameter of the second through hole is not less than the sum of the diameter of the cable and the diameter of the inner annular airbag intake valve, and the difference between the diameter of the second through hole and the sum of the diameter of the cable and the diameter of the inner annular airbag intake valve is not greater than 1 cm.

6. The sealing device for external cables of a low pressure test box according to claim 1, characterized in that: The diameters of the inner cover plate and the outer cover plate are not greater than three times the diameter of the operation hole of the low pressure test box.

7. A method for sealing an external cable of a low pressure test box, characterized in that: The method adopts the sealing device according to any one of claims 1 to 6, comprising the following steps: The outer annular airbag is installed on the outer side of the first airbag clamping bracket, and the inner annular airbag is installed on the inner side of the first airbag clamping bracket; Insert the first airbag clamping bracket after installing the airbag into the operation hole of the low pressure test box; The cable is surface treated to ensure close contact with the inner annular air bag; Insert the cable into the inner annular airbag and adjust the cable length inside and outside the test box to meet the test requirements; Install the second airbag clamping bracket and connect the second airbag clamping bracket to the first airbag clamping bracket using fastening screws; The inner and outer annular airbags are inflated in sequence until the air pressure reaches the set value to complete the sealing.

8. The sealing method according to claim 7, characterized in that: The surface treatment of the cable includes: cleaning the contaminants on the cable surface and smoothing the concave surface.

9. The sealing method according to claim 8, characterized in that: The concave surface smoothing treatment includes leveling with organic clay or inorganic clay.

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