CN212300763U

CN212300763U - Metal bellows leak hunting equipment

Info

Publication number: CN212300763U
Application number: CN202021209086.6U
Authority: CN
Inventors: 梦丹尼
Original assignee: Weifu Metal Products Shanghai Co ltd
Current assignee: Weifu Metal Products Shanghai Co ltd
Priority date: 2020-06-27
Filing date: 2020-06-27
Publication date: 2021-01-05
Anticipated expiration: 2030-06-27

Abstract

The utility model relates to a metal bellows leak hunting equipment, this equipment includes to the gas inlet mechanism (8) of aerifing in the metal bellows, airtight chamber (6) and hold-down mechanism, hold-down mechanism includes airtight cover (4), airtight pad (5) are equipped with in the lower part of airtight chamber (6), be equipped with the sensor that detects atmospheric pressure in airtight chamber (6); the air inlet mechanism (8) is arranged below the airtight chamber (6); the two ends of the metal corrugated pipe are provided with end covers (9), each end cover (9) comprises a large ring (91) and a small ring (92) which are integrally formed, each large ring (91) comprises a large ring radial surface (911), and each air-tight cover (4) comprises a cover flange (41) and a cover groove (42). Compared with the prior art, the utility model has the advantages of eliminate other interference factor, the objective accuracy of testing result.

Description

Metal bellows leak hunting equipment

Technical Field

The utility model relates to a leak hunting equipment field, concretely relates to corrugated metal pipe leak hunting equipment.

Background

In the automotive industry, leak detection has a significant impact on the quality, reliability, and reduced emissions of metal bellows. With the continuous improvement of global industrialization, people pay more and more attention to the reliability, environmental protection and low use cost of vehicles. The emission standards and environmental requirements for automobile exhaust are becoming more stringent worldwide. In order to meet the market demand, the global automobile industry also provides more strict leak detection standards for driving part suppliers, and professional leak detection solutions meet the global development trend of increasing leak detection standards.

In the existing leakage detection method, generally, after the metal corrugated pipe body is sealed up and down, the pipe body is inflated, and then the flow of gas leakage is detected to judge whether the metal corrugated pipe body is tightly jointed.

Disclosure of Invention

The utility model aims at providing a metal bellows leak hunting equipment that eliminates other interference factors, the objective accuracy of testing result in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

in the existing leakage detection equipment, a metal corrugated pipe body is generally required to be sealed up and down, then the metal corrugated pipe body is inflated, and then the air tightness is judged by detecting the flow of air leakage. However, after several batches of testing, many more product air tightness failures were found.

Carefully analyzing, the metal corrugated pipe mainly is a corrugated pipe body formed by the joint of an inner lining hose and an outer lining telescopic hard pipe, and the end cover is welded with the corrugated pipe body, wherein the end cover comprises a large ring and a small ring which are integrally formed, the large ring comprises a large ring radial surface and a large ring axial surface, and the small ring only has a certain area in the axial direction. The inventor finds the nature of the problem after long-time exploration, and then proposes the following scheme:

a metal corrugated pipe leakage detection device comprises an air inlet mechanism, an airtight chamber and a pressing mechanism, wherein the air inlet mechanism, the airtight chamber and the pressing mechanism are used for inflating the metal corrugated pipe; the air inlet mechanism is arranged below the airtight chamber;

the two ends of the metal corrugated pipe are provided with end covers, each end cover comprises a large ring and a small ring which are integrally formed, each large ring comprises a large ring radial surface, and each airtight cover comprises a cover flange and a cover groove; during testing, the airtight pad is abutted with the large ring radial surface at the lower end, the cover flange is abutted with the large ring radial surface at the upper end, and the small ring is inserted into the cover groove.

The air-tight lid of ingenious design has eliminated the interference factor that equipment and corrugated metal pipe contact leaked, at first, the air-tight lid is equipped with the lid flange, this lid flange and big ring radial surface butt for original point contact becomes the face contact, and the gas tightness is better, is equipped with the lid recess again, and this lid recess holds the annulet into, makes the existence of annulet not hinder the butt of lid flange and big ring radial surface, so, other interference factors have been eliminated to the result of test, and the result is more objective accurate.

Furthermore, the airtight cover also comprises a cover boss, and the cover boss extends into the metal corrugated pipe during testing. With such a design, the contact airtightness can be further improved by one level.

Further, the length of the cover boss is 10-20% of the length of the metal corrugated pipe.

Furthermore, a sealing gasket for increasing air tightness is arranged on the cover flange.

Further, the area of the cover flange is 80-120% of the area of the radial surface of the large ring.

Furthermore, the pressing mechanism further comprises a pressing rod and an air cylinder, and the pressing rod is connected with the air-tight cover and is connected with the air cylinder in an inserting mode.

Furthermore, the air cylinder is connected with an external air source through an air pipe.

Furthermore, the air inlet mechanism comprises an air inlet source and an air inlet pipe, and the air inlet pipe connects the lower part of the airtight chamber with the air inlet source.

Furthermore, one side of the airtight chamber is provided with an openable safety door. During the test, can close the emergency exit, both can make the sensor detect more sensitively accurate, also can avoid atmospheric pressure too big, the danger that the bellows explodes and splits and bring.

Furthermore, the safety door is made of transparent materials.

Furthermore, a sealing gasket for increasing air tightness is arranged on the cover flange. With such a design, the contact airtightness can be further improved by one level.

When the examination of awaiting measuring, aerify in to the cylinder for the compressing tightly pole descends, makes gas seal cover and gas seal gasket tightly butt with upper and lower end cover simultaneously, begins the test after the butt is accomplished. Actually, the air-tight gasket also has a sealing structure similar to the air-tight cover, so that the air tightness of the bottom is ensured to be good, the air-tight gasket is tightly abutted against the radial surface of the large ring, but the air tightness of the bottom is not a key part for testing through analysis.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the air-tight cover is provided with a cover flange which is abutted against the radial surface of the large ring, so that the original point contact is changed into surface contact, and the air tightness is better;

(2) the airtight cover is also provided with a cover groove, and the cover groove can accommodate the small ring, so that the existence of the small ring does not hinder the abutting of the cover flange and the radial surface of the large ring;

(3) the airtight cover also comprises a cover boss, and the cover boss extends into the metal corrugated pipe during testing, so that the contact airtightness can be improved by one level;

(4) but the emergency exit of switch is equipped with to airtight room one side, during the test, can close the emergency exit, both can make the sensor detect more sensitive accurate, also can avoid atmospheric pressure too big, the danger that the bellows explodes and splits and bring.

Drawings

FIG. 1 is a perspective view of the apparatus in the example;

FIG. 2 is a front view of the apparatus in the example;

FIG. 3 is a perspective view of the airtight cover of the embodiment;

FIG. 4 is a partial cross-sectional view of the air tight cover and end cap mating in an embodiment;

FIG. 5 is a perspective view of a hermetic cap in a comparative example;

FIG. 6 is a partial cross-sectional view of a mating hermetic cover and end cap of a comparative example;

the reference numbers in the figures indicate: the air cylinder 1, the air pipe 2, the pressing rod 3, the airtight cover 4, the cover flange 41, the cover groove 42, the cover boss 43, the sealing surface 44, the airtight pad 5, the airtight chamber 6, the air inlet mechanism 8, the air inlet pipe 81, the end cover 9, the large ring 91, the large ring radial surface 911, the small ring 92 and the safety door 10.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

A metal corrugated pipe leakage detection device is disclosed, as shown in fig. 1-2, the device comprises an air inlet mechanism 8 for inflating the metal corrugated pipe, an airtight chamber 6 and a pressing mechanism, wherein the pressing mechanism comprises an airtight cover 4, an airtight pad 5 is arranged at the lower part of the airtight chamber 6, and a sensor for detecting air pressure is arranged in the airtight chamber 6; the air inlet mechanism 8 is arranged below the airtight chamber 6; one side of the airtight chamber is provided with an openable and closable safety door 10, and the safety door 10 is made of transparent materials. During testing, the safety door 10 can be closed, so that the sensor can detect more sensitively and accurately, and the danger caused by the burst of the corrugated pipe due to overlarge air pressure can be avoided.

As shown in fig. 3-4, the end caps 9 are arranged at two ends of the metal corrugated pipe, the end caps 9 comprise a large ring 91 and a small ring 92 which are integrally formed, the large ring 91 comprises a large ring radial surface 911, and the air-tight cover 4 comprises a cover flange 41 and a cover groove 42; during testing, the gasket 5 abuts against the large annular radial surface 911 at the lower end, the cover flange 41 abuts against the large annular radial surface 911 at the upper end, and the small ring 92 is inserted into the cover groove 42. The air-tight cover 4 of ingenious design has eliminated the interference factor of equipment and the contact leakage of metal bellows, firstly, the air-tight cover 4 is equipped with lid flange 41, this lid flange 41 and big ring radial surface 911 butt, make original point contact become the face contact, the gas tightness is better, be equipped with lid recess 42 again, this lid recess 42 holds ringlet 92 into, make the existence of ringlet not hinder the butt of lid flange 41 and big ring radial surface 911, so, other interference factor has been eliminated to the result of test, the result is more objective accurate. The airtight cover 4 may further include a cover boss 43, and the cover boss 43 is protruded into the metal bellows at the time of testing. With such a design, the contact airtightness can be further improved by one level. A gasket for increasing airtightness is provided on the lid flange 41. With such a design, the contact airtightness can be further improved by one level.

Quantitatively, the length of the cover boss 43 is 10-20% of the length of the metal bellows. The area of the cover flange 41 is 80-120% of the area of the large annular radial face 911.

The pressing mechanism further comprises a pressing rod 3 and an air cylinder 1, and the pressing rod 3 is connected with the air tight cover 4 and is connected with the air cylinder 1 in an inserting mode. The cylinder 1 is connected with an external air source through an air pipe 2. When the test is to be tested, the air cylinder 1 is inflated, the pressing rod 3 descends, the airtight cover 4 and the airtight pad 5 are tightly abutted to the upper end cover 9 and the lower end cover 9 simultaneously, and the test is started after the abutment is completed. The air inlet mechanism 8 comprises an air inlet source and an air inlet pipe 81, and the air inlet pipe 81 connects the lower part of the airtight chamber 6 with the air inlet source.

After 1000 times of tests, the device still has accurate results.

Comparative example

The difference from the example is that in the comparative example, the airtight cap structure is shown in figure 5, including a flat sealing surface 44, and only makes point/line contact with the small ring 92 when tested, as shown in figure 6.

After the device is tested for 200 times, the result begins to deviate due to the aging of the sealing surface.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The metal corrugated pipe leakage detection equipment is characterized by comprising an air inlet mechanism (8) for inflating the metal corrugated pipe, an airtight chamber (6) and a pressing mechanism, wherein the pressing mechanism comprises an airtight cover (4), an airtight pad (5) is arranged at the lower part of the airtight chamber (6), and a sensor for detecting air pressure is arranged in the airtight chamber (6); the air inlet mechanism (8) is arranged below the airtight chamber (6);

end covers (9) are arranged at two ends of the metal corrugated pipe, each end cover (9) comprises a large ring (91) and a small ring (92) which are integrally formed, each large ring (91) comprises a large ring radial surface (911), and each airtight cover (4) comprises a cover flange (41) and a cover groove (42); during testing, the air gasket (5) is abutted with the large ring radial surface (911) at the lower end, the cover flange (41) is abutted with the large ring radial surface (911) at the upper end, and the small ring (92) is inserted into the cover groove (42).

2. A metal bellows leak detection apparatus according to claim 1, wherein said airtight cover (4) further comprises a cover boss (43), and said cover boss (43) is protruded into the metal bellows during a test.

3. A metal bellows leak detection apparatus according to claim 2, wherein the cover boss (43) has a length of 10 to 20% of the length of the metal bellows.

4. Leak detection apparatus for metal bellows according to claim 1, wherein a gasket for increasing airtightness is provided on the lid flange (41).

5. A metal bellows leak detection device according to claim 1, wherein the area of said cover flange (41) is 80-120% of the area of the large annular radial face (911).

6. The leak detection device for the metal bellows as claimed in claim 1, wherein the pressing mechanism further comprises a pressing rod (3) and a cylinder (1), and the pressing rod (3) is connected with the airtight cover (4) and is inserted into the cylinder (1).

7. Leak detection apparatus for metal bellows according to claim 6, wherein the cylinder (1) is connected to an external gas source via a gas pipe (2).

8. Leak detection apparatus for metal bellows according to claim 1, characterized in that said air inlet means (8) comprises an air inlet source and an air inlet pipe (81), said air inlet pipe (81) connecting the lower part of the gastight chamber (6) with the air inlet source.

9. Leak detection apparatus for metal bellows according to claim 1, wherein an openable and closable safety door (10) is provided on one side of the airtight chamber.

10. Leak detection apparatus for metal bellows according to claim 9, wherein the safety door (10) is of a transparent material.