CN212158971U - Detection tool for detecting air tightness of end cover - Google Patents
Detection tool for detecting air tightness of end cover Download PDFInfo
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- CN212158971U CN212158971U CN202021391979.7U CN202021391979U CN212158971U CN 212158971 U CN212158971 U CN 212158971U CN 202021391979 U CN202021391979 U CN 202021391979U CN 212158971 U CN212158971 U CN 212158971U
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- end cover
- step part
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Abstract
A checking fixture for detecting the air tightness of an end cover comprises a checking fixture body, wherein a step counter bore is formed in the middle of the checking fixture body in a concave mode and comprises a small step part and a large step part, the large step part is connected to the upper end of the small step part and matched with the small cylindrical surface of the end cover to be detected, an inclined plane inclining outwards with a certain angle is arranged at the opening part of the upper end of the large step part, a fluorine rubber O-shaped ring for sealing is embedded in the peripheral wall of the large step part, the inner diameter of the fluorine rubber O-shaped ring is smaller than the outer diameter of the small cylindrical surface of the end cover to be detected, the depth of the large step part is smaller than the height of the small cylindrical surface of the end cover to be; the outer wall of the gauge body is provided with two vent holes communicated with the small step part, one vent hole is connected with the negative pressure pump through a first air pipe, and the other vent hole is communicated with the negative pressure meter through a second air pipe; the detection effect is good, and damage to the large end face of the product to be detected in the detection process is avoided.
Description
Technical Field
The utility model relates to a detection device before the assembly of end cover class product specifically is an examine utensil of detection end cover gas tightness.
Background
In the new forms of energy field, drive motor casing class part requires highly to the gas tightness, and what detect part gas tightness in the present trade generally adopted is the malleation mode, compresses tightly the work piece through connecting seal structure's cylinder promptly, carries out effective shutoff to sealed face and hole, and the part cavity is kept apart with the outside completely, lets in compressed air, detects whether there is the leakage in the product. The problems of the end cover adopting positive pressure detection are as follows:
1. the locking force is too small, the sealing surface cannot be completely sealed, and the purpose of detection cannot be achieved;
2. the product to be tested can be crushed due to overlarge locking force, and the product deformation can be caused, so that the size and tolerance requirements of the product are directly influenced.
Disclosure of Invention
The utility model discloses an invention aim at overcoming the above-mentioned not enough of current means, and provide an utensil of examining of detection end cover gas tightness, detection effect is good, can effectively avoid treating the damage of detecting the big terminal surface of product in the testing process.
The technical scheme of the utility model is that: a checking fixture for detecting the air tightness of an end cover comprises a checking fixture body, wherein a step counter bore is formed in the middle of the checking fixture body in a concave mode and comprises a small step part and a large step part, the large step part is connected to the upper end of the small step part and matched with the small cylindrical surface of the end cover to be detected, an inclined plane inclining outwards with a certain angle is arranged at the opening part of the upper end of the large step part, a fluorine rubber O-shaped ring for sealing is embedded in the peripheral wall of the large step part, the inner diameter of the fluorine rubber O-shaped ring is smaller than the outer diameter of the small cylindrical surface of the end cover to be detected, the depth of the large step part is smaller than the height of the small cylindrical surface of the end cover to be; the outer wall of the checking fixture body is provided with two vent holes communicated with the small step part, one vent hole is connected with the negative pressure pump through a first air pipe, and the other vent hole is communicated with the negative pressure meter through a second air pipe.
And a contact gap between the fluorine rubber O-shaped ring and the end cover to be detected is-0.2 mm to-0.3 mm.
And the inner diameter of the fluorine rubber O-shaped ring is 0.5mm smaller than the outer diameter of the small cylindrical surface of the end cover to be detected.
The depth of the large step part is 1mm smaller than the height of the small cylindrical surface of the end cover to be detected.
The inclined plane and the vertical plane form an included angle of 30 degrees.
The outer surface of the end cover to be detected is of a stepped type and comprises a large cylindrical surface and a small cylindrical surface connected to the lower end of the large cylindrical surface.
The utility model discloses set up big chamfer inclined plane, do benefit to the product and place to can effectively combine with O type circle, make things convenient for the later stage to take out sealed of negative pressure.
The utility model discloses to compress tightly the face and change the higher step face of intensity into from sealed face, change the malleation mode into the negative pressure mode, support the step height and be less than product small circle cylinder height, prevent that the sealed face of the product that awaits measuring from contacting and examine the utensil upper plane, effectively avoidd the malleation and examined time measuring need compress tightly the product and lead to the risk that the product damaged.
The whole detection process of the utility model can not cause the large end face of the product to generate pressure damage, micro deformation and the like; the product is easy to take and place, and the operation is simple; low cost and easy manufacture.
Drawings
FIG. 1 is a schematic view of a gauge body of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
In fig. 1 and 2, the utility model discloses an inspection device body 3, the middle part of the inspection device body 3 is recessed downward to form a step counter bore, the step counter bore includes a small step part, a large step part connected to the upper end of the small step part and matched with the small cylindrical surface of the end cover 1 to be inspected, the upper opening part of the large step part is provided with an inclined plane inclined outward by 30 degrees, the step counter bore plays a role of guiding to prevent the product from colliding when being placed, the peripheral wall of the large step part is embedded with a fluorine rubber O-ring 2 for sealing, the inner diameter of the fluorine rubber O-ring 2 is smaller than the outer diameter of the small cylindrical surface of the end cover 1 to be inspected, the depth of the large step part is smaller than the height 1mm of the small cylindrical surface of the end cover 1 to be inspected, after the end cover 1 to be inspected is placed into the inspection device body 3, the lower end surface of the large cylindrical surface of the end, the lower end part of the small cylindrical surface and the bottom of the step counter bore form a sealed cavity; the outer wall of the checking fixture body 3 is provided with two vent holes communicated with the small step part, one vent hole is connected with a negative pressure pump 5 through a first air pipe 4, and the other vent hole is communicated with a negative pressure meter 7 through a second air pipe 6. The contact clearance between the fluorine glue O-shaped ring 2 and the end cover 1 to be detected is minus 0.2mm to minus 0.3mm, the inner diameter of the fluorine glue O-shaped ring 2 is further smaller than the outer diameter of the small cylindrical surface of the end cover 1 to be detected by 0.5mm, the end cover 1 to be detected is put in, and sealing can be realized by slightly pressing without applying external force.
The outer surface of the end cover 1 to be detected is of a stepped type and comprises a large cylindrical surface and a small cylindrical surface connected to the lower end of the large cylindrical surface.
During the use, the hole on the end cover 1 that awaits measuring is blocked, the little cylinder face end of the end cover 1 that awaits measuring after the shutoff, keep flat at the big step portion of examining a body 3, the bottom contacts spacingly with big step portion bottom surface, it is sealed through 2 interference fit of fluorine glue O type circle all around, the contact gap between the end cover 1 that awaits measuring of fluorine glue O type circle 2 is-0.3 mm, confirm negative pressure table 7, vacuum pump 5 is connected well with examining a body 3, trachea one 4, trachea two 6 are undamaged, open vacuum pump 5 power, begin to extract the air in die cavity 3, observe the negative pressure value that negative pressure table 7 shows, after reaching the pressure value that the product required, close the vacuum pump power. And observing the pressure display change according to the time required by detection, and judging whether the required sealing measurement result is achieved. If an air leakage phenomenon exists in the process, a small amount of water can be sprayed on the upper surface of the end cover 1 to be detected, the water suction point is observed, and the air leakage point is determined.
Claims (6)
1. The utility model provides an utensil is examined to detection end cover gas tightness which characterized in that: the detection tool comprises a detection tool body (3), a step counter bore is formed in the middle of the detection tool body (3) in a concave mode, the detection tool comprises a small step part, a large step part is connected to the upper end of the small step part and matched with the small cylindrical surface of an end cover (1) to be detected, an inclined surface inclining outwards with a certain angle is arranged at the opening part of the upper end of the large step part, a fluorine rubber O-shaped ring (2) used for sealing is embedded in the peripheral wall of the large step part, the inner diameter of the fluorine rubber O-shaped ring (2) is smaller than the outer diameter of the small cylindrical surface of the end cover (1) to be detected, the depth of the large step part is smaller than the height of the small cylindrical surface of the end cover (1) to be detected, after the end cover (1) to be detected; the outer wall of the gauge body (3) is provided with two vent holes communicated with the small step part, one vent hole is connected with the negative pressure pump (5) through a first air pipe (4), and the other vent hole is communicated with the negative pressure meter (7) through a second air pipe (6).
2. The inspection tool for detecting end cap air tightness according to claim 1, wherein: the contact clearance between the fluorine rubber O-shaped ring (2) and the end cover (1) to be detected is-0.2 mm to-0.3 mm.
3. The inspection tool for detecting end cap air tightness according to claim 1, wherein: the inner diameter of the fluorine rubber O-shaped ring (2) is 0.5mm smaller than the outer diameter of the small cylindrical surface of the end cover (1) to be detected.
4. The inspection tool for detecting end cap air tightness according to claim 1, wherein: the depth of the large step part is 1mm smaller than the height of the small cylindrical surface of the end cover (1) to be detected.
5. The inspection tool for detecting end cap air tightness according to claim 1, wherein: the inclined plane and the vertical plane form an included angle of 30 degrees.
6. The inspection tool for detecting end cap air tightness according to claim 1, wherein: the outer surface of the end cover (1) to be detected is of a stepped type and comprises a large cylindrical surface and a small cylindrical surface connected to the lower end of the large cylindrical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021391979.7U CN212158971U (en) | 2020-07-15 | 2020-07-15 | Detection tool for detecting air tightness of end cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021391979.7U CN212158971U (en) | 2020-07-15 | 2020-07-15 | Detection tool for detecting air tightness of end cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212158971U true CN212158971U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021391979.7U Active CN212158971U (en) | 2020-07-15 | 2020-07-15 | Detection tool for detecting air tightness of end cover |
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| CN (1) | CN212158971U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754946A (en) * | 2022-05-07 | 2022-07-15 | 无锡吉冈精密科技股份有限公司 | New energy automobile turns to motor casing gas tightness testing arrangement |
-
2020
- 2020-07-15 CN CN202021391979.7U patent/CN212158971U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754946A (en) * | 2022-05-07 | 2022-07-15 | 无锡吉冈精密科技股份有限公司 | New energy automobile turns to motor casing gas tightness testing arrangement |
| CN114754946B (en) * | 2022-05-07 | 2023-10-31 | 无锡吉冈精密科技股份有限公司 | New energy automobile turns to motor housing gas tightness testing arrangement |
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