CN109848887B - High-low temperature test fixture - Google Patents
High-low temperature test fixture Download PDFInfo
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- CN109848887B CN109848887B CN201811507168.6A CN201811507168A CN109848887B CN 109848887 B CN109848887 B CN 109848887B CN 201811507168 A CN201811507168 A CN 201811507168A CN 109848887 B CN109848887 B CN 109848887B
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- sealing ring
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- clamp
- joint
- sealing
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Abstract
The invention belongs to the technical field of pressure sensors, and relates to a high-low temperature test fixture. Two independent sealed spaces are designed in the clamp, one space fixes the clamp on a test hole position by continuously applying negative pressure through vacuum pumping equipment, and the other space applies required positive and negative pressure to the test hole through a pressure controller; the material used by the sealing ring of the clamp is low-phenyl silicone rubber, so that the sealing performance of the clamp under high and low temperature conditions is ensured.
Description
Technical Field
The invention belongs to the technical field of pressure sensors, and relates to a high-low temperature test fixture.
Background
In the process of developing aviation products, positive and negative pressure needs to be applied to test hole sites of the products under the conditions of high and low temperature. In order to facilitate operation, a vacuum chuck is selected as a test fixture, but the vacuum chuck on the market can only provide negative pressure, and the chuck material can be hardened under the low-temperature condition, so that the mechanical property of the chuck material is changed, the sealing property of the chuck fails, and the test requirement cannot be met.
Disclosure of Invention
The purpose of the invention is: in order to meet the requirement that high and low temperature tests pressurize test hole sites, the invention provides a high and low temperature test fixture which can apply positive and negative pressure to the test hole sites.
In order to solve the technical problem, the technical scheme of the invention is as follows:
the utility model provides a high low temperature test fixture which characterized in that: the clamp consists of a first joint 5, a second joint 6, a shell 7, a first sealing ring 4 and a second sealing ring 2;
the upper part of the shell 7 is provided with two through holes, and the lower part of the shell is of a concentric circular structure and is provided with concentric circular bulges;
the first joint 5 and the second joint 6 are hermetically connected through a through hole at the upper end part of the shell 7;
one end of the first sealing ring 4 is provided with a groove matched with the inner circular ring bulge of the shell 7, and the other end of the first sealing ring is an inclined plane which is inward;
one end of the second sealing ring 2 is provided with a groove matched with the external circular ring bulge of the shell 7, and the other end of the second sealing ring is an inclined plane which faces outwards;
the first sealing ring 4 and the second sealing ring 2 are hermetically connected with the lower end part of the shell 7; the first space 3 is formed inside the first seal ring 4, and the second space 1 is formed by the first seal ring 4 and the second seal ring 2.
The first sealing ring 4 is made of low phenyl silicone rubber.
The second sealing ring 2 is made of low phenyl silicone rubber.
The sealing connection mode of the first joint 5 and the shell 7 is as follows: and (5) connecting by screw threads and gluing and sealing.
The sealing connection mode of the second joint 6 and the shell 7 is as follows: and (5) connecting by screw threads and gluing and sealing.
Preferably, the material of the first sealing ring 4 is low phenyl silicone rubber.
Preferably, the material of the second sealing ring 2 is low phenyl silicone rubber.
Preferably, the included angle between the top end of the inclined plane of the first sealing ring 4 and the horizontal plane is 15-25 degrees.
Preferably, the included angle between the top end of the inclined plane of the second sealing ring 2 and the horizontal plane is 15-25 degrees.
The invention has the beneficial effects that: the test fixture replaces the traditional vacuum chuck, uses the low phenyl silicone rubber material as the sealing ring material, allows the long-term use temperature range to reach-55-100 ℃, can apply positive pressure and negative pressure to the pressure measuring hole site during the test, does not need to replace the test fixture, and is convenient to use.
Drawings
FIG. 1 is a schematic cross-sectional view of a seal configuration of the present invention;
FIG. 2 is an isometric view of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a schematic view of the glue application of the present invention;
FIG. 5 is a schematic view of the housing of the present invention;
FIG. 6 is a top view of the housing of the present invention;
FIG. 7 is a schematic representation of the use of the present invention;
in the figure, 1-second space, 2-second sealing ring, 3-first space, 4-first sealing ring, 5-first joint, 6-second joint, 7-shell, 8-vacuum pump and 9-pressure controller.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
as shown in fig. 1, after the test fixture is fixed on a plane, the first space 3 is isolated from the second space 1 by the first sealing ring 4, and the second space 1 is isolated from the atmosphere by the second sealing ring 2. One end of the first sealing ring 4 is provided with a groove matched with the inner circular ring bulge of the shell 7, and the other end is an inclined plane which is inward (i.e. concave and convex); the top end of the inclined plane and the horizontal plane form an included angle of 20 degrees; one end of the second sealing ring 2 is provided with a groove matched with the external circular ring bulge of the shell 7, and the other end is an inclined plane which is outward (namely, inward convex and outward concave); the top end of the inclined plane forms an included angle of 20 degrees with the horizontal plane.
As shown in fig. 2 and 3, the test fixture is composed of a first joint 5, a second joint 6, a housing 7, a first seal ring 4, and a second seal ring 2. The first sealing ring 4 and the second sealing ring 2 are made of low phenyl silicone rubber, the hardening temperature is reduced to the lowest value (-115 ℃), and the first sealing ring and the second sealing ring still have flexible elasticity at the temperature of minus 100 ℃.
As shown in fig. 4, the first joint 5, the second joint 6 and the housing 7 are sealed by screwing 704 with silicone rubber.
As shown in fig. 5 and 6, the housing 7 has two threaded holes and two bosses for connecting the first joint 5, the second joint 6, the first seal ring 4, and the second seal ring 2, respectively.
As shown in FIG. 7, the first connector 5 of the test fixture is connected to a pressure controller 9, and the second connector 6 is connected to a vacuum pump 8. The first space 3 is aligned to the pressure measuring hole site, then the vacuum pump 8 is turned on, and the test fixture is fixed on the test hole site. The required positive and negative pressures are applied to the second space 1 using the pressure controller 9.
The test fixture is internally provided with two independent sealed spaces, one of the two sealed spaces is fixed on a test hole position by continuously applying negative pressure through vacuum pumping equipment, and the other sealed space is used for applying required positive and negative pressure to the test hole through a pressure controller. The material used on the sealing ring of the clamp is low-phenyl silicone rubber, so that the sealing performance of the clamp under high and low temperature conditions is ensured.
Claims (5)
1. The utility model provides a high low temperature test fixture which characterized in that: the clamp consists of a first joint (5), a second joint (6), a shell (7), a first sealing ring (4) and a second sealing ring (2);
the upper part of the shell (7) is provided with two through holes, and the lower part of the shell is of a concentric circular structure and is provided with concentric circular bulges;
the first joint (5) and the second joint (6) are hermetically connected through a through hole at the upper end part of the shell (7);
one end of the first sealing ring (4) is provided with a groove matched with the inner circular ring bulge of the shell (7), and the other end of the first sealing ring is an inclined plane which is inward;
one end of the second sealing ring (2) is provided with a groove matched with the external circular ring bulge of the shell (7), and the other end of the second sealing ring is an inclined plane which faces outwards;
the first sealing ring (4) and the second sealing ring (2) are hermetically connected with the lower end part of the shell (7); a first space (3) is formed inside the first sealing ring (4), and a second space (1) is formed by the first sealing ring (4) and the second sealing ring (2);
the first sealing ring (4) is made of low phenyl silicone rubber;
the second sealing ring (2) is made of low phenyl silicone rubber.
2. The clamp of claim 1, wherein: the sealing connection mode of the first joint (5) and the shell (7) is as follows: and (5) connecting by screw threads and gluing and sealing.
3. The clamp of claim 1, wherein: the sealing connection mode of the second joint (6) and the shell (7) is as follows: and (5) connecting by screw threads and gluing and sealing.
4. The clamp of claim 1, wherein: the included angle between the top end of the inclined plane of the first sealing ring (4) and the horizontal plane is 15-25 degrees.
5. The clamp of claim 1, wherein: the included angle between the top end of the inclined plane of the second sealing ring (2) and the horizontal plane is 15-25 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507168.6A CN109848887B (en) | 2018-12-11 | 2018-12-11 | High-low temperature test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507168.6A CN109848887B (en) | 2018-12-11 | 2018-12-11 | High-low temperature test fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109848887A CN109848887A (en) | 2019-06-07 |
| CN109848887B true CN109848887B (en) | 2021-01-12 |
Family
ID=66890886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811507168.6A Active CN109848887B (en) | 2018-12-11 | 2018-12-11 | High-low temperature test fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109848887B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5273615A (en) * | 1992-04-06 | 1993-12-28 | Motorola, Inc. | Apparatus and method for handling fragile semiconductor wafers |
| KR100330166B1 (en) * | 1999-09-17 | 2002-03-28 | 곽정소 | A tester for evaluating pressure characteristic of a pressure sensor |
| CN201083751Y (en) * | 2007-09-13 | 2008-07-09 | 高铁检测仪器（东莞）有限公司 | High low temperature box constant pressure jigs |
| CN203365060U (en) * | 2013-08-15 | 2013-12-25 | 山东正辉石油装备集团有限公司 | Diffusion silicon pressure sensor test fixture |
| CN206277173U (en) * | 2016-12-02 | 2017-06-27 | 凯茂科技(深圳)有限公司 | Adsorption plant |
| CN206876477U (en) * | 2017-05-22 | 2018-01-12 | 美特斯工业系统（中国）有限公司 | A kind of high/low temperature hydraulic pressure Wedge gripping |
-
2018
- 2018-12-11 CN CN201811507168.6A patent/CN109848887B/en active Active
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| Publication number | Publication date |
|---|---|
| CN109848887A (en) | 2019-06-07 |
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