CN114264431A - Pressure reference device for leak detection, assembly method and pressure sensor - Google Patents
Pressure reference device for leak detection, assembly method and pressure sensor Download PDFInfo
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- CN114264431A CN114264431A CN202111675116.1A CN202111675116A CN114264431A CN 114264431 A CN114264431 A CN 114264431A CN 202111675116 A CN202111675116 A CN 202111675116A CN 114264431 A CN114264431 A CN 114264431A
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 16
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 238000003466 welding Methods 0.000 claims description 31
- 238000010894 electron beam technology Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a pressure reference device for leakage detection, which comprises a pressure reference cavity, a shell, a thimble, an adjusting block, a shell sleeve and a plunger; one end of the pressure reference cavity is open, one end of the shell is open and butted with the opening of the pressure reference cavity, the other end of the shell is provided with a small hole, the adjusting block is positioned in the shell and is provided with a vent hole, one end of the ejector pin is connected with the adjusting block, the other end of the ejector pin is positioned in the small hole, a convex ring is arranged at one end of the small hole of the ejector pin, a spring is sleeved on the ejector pin between the adjusting block and the convex ring, and a sealing element is sleeved on the ejector pin between the convex ring and the small hole; the shell is connected with the shell, one end of the plunger is hermetically arranged in the shell, and the other end of the plunger extends out of the shell; the middle part of the plunger is provided with a plunger hole, one end of the plunger inside the shell is provided with a boss, the end part of the boss is abutted against the other end of the thimble, and the periphery of the boss is provided with an air guide hole communicated with the plunger hole. The invention has the advantages of simple structure, simple and convenient operation, high pressurizing precision, good sealing effect and the like.
Description
Technical Field
The invention mainly relates to the technical field of pressure detection, in particular to a pressure reference device for leakage detection, an assembly method and a pressure sensor.
Background
The pressure sensor for detecting micro leakage measures pressure within +/-133 Pa, the pressure is small, and a pressure chip with a small measuring range is required to be used. For large pressure chamber leaks, the use of a pressure reference chamber for differential pressure measurement is a good method. The existing pressure filling precision is not high, and leakage is easy. For example, when a tire is pressurized, although the filling pressure is monitored by a pressure gauge, the error is large, gas leaks when the pressure filling interface is pulled out, the final filling pressure is unknown, the output influence is very large for a pressure chip which is used for detecting the leakage and is about 20kPa, and the pressurizing mode is not suitable. In addition, the sealing interface is easy to leak due to the adoption of the sealing ring, the time is long, the filling pressure can be gradually reduced, and the pressure chip with the pressure of 20kPa can be broken due to the reduction of the pressure. In addition, pressure fluctuation exists in the principle of the gas cylinder pressure filling interface in the closing process of the valve, so that the filling pressure is not accurate, the valve has a certain leakage rate, and the high-pressure can also leak for a long time.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the invention provides the pressure reference device for leakage detection, the assembly method and the pressure sensor, which have the advantages of simple structure, simple and convenient operation and good sealing effect.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a pressure reference device for leak detection comprises a pressure reference cavity, a pressure inlet assembly and a pressurizing assembly; the pressure regulating device comprises a pressure reference cavity, a pressure inlet assembly and a pressure regulating assembly, wherein one end of the pressure reference cavity is provided with an opening, the pressure inlet assembly comprises a shell, a thimble and a regulating block, the opening at one end of the shell is in butt joint with the opening of the pressure reference cavity, the other end of the shell is provided with a small hole, the regulating block is positioned in the shell and is provided with a vent hole, one end of the thimble is connected with the regulating block, the other end of the thimble is positioned in the small hole, a convex ring is arranged at one end of the small hole of the thimble, a spring is sleeved on the thimble between the regulating block and the convex ring, and a sealing element is sleeved on the thimble between the convex ring and the small hole; the pressurizing assembly comprises a shell sleeve and a plunger, the shell sleeve is connected with the shell, one end of the plunger is hermetically arranged in the shell, and the other end of the plunger extends out of the shell sleeve; the middle part of the plunger is provided with a plunger hole, one end of the plunger inside the shell is provided with a boss, the end part of the boss is abutted against the other end of the thimble, and the periphery of the boss is provided with an air guide hole communicated with the plunger hole.
As a further improvement of the above technical solution:
the inside of shell is provided with the internal thread, the regulating block with internal thread threaded connection is used for adjusting the pressure of spring.
The middle part of regulating block is provided with the through-hole, the one end of thimble is located in the through-hole.
The plunger is located the week side of the one end of shell is provided with the sealing washer, be used for with the inner wall of shell is sealed mutually.
The outer side of the other end of the shell is provided with an external thread, and the inner side of the shell sleeve is in threaded connection with the external thread of the shell.
And a groove is arranged on the outer side of the other end of the shell.
An opening at one end of the shell is butted with an opening of the pressure reference cavity in a welding mode.
The invention also discloses a pressure sensor comprising the pressure reference device for leakage detection.
The invention further discloses an assembling method of the pressure reference device for leakage detection, which comprises the following steps:
assembling the pressure inlet assembly: firstly, sleeving a sealing element on the other end of the thimble, then integrally placing the thimble into the shell, and inserting the other end of the thimble into a small hole in the front of the shell; then, sleeving a spring on the middle part of the thimble, finally screwing in an adjusting block, and adjusting the pressure;
welding the pressure inlet assembly: after the integral assembly of the pressure inlet assembly is completed, an opening at one end of the shell is welded at an opening part of the pressure reference cavity in a laser welding or electron beam welding mode;
assembling the pressurizing assembly: connecting the shell sleeve with the outer shell so that the plunger extends into the inner part of the outer shell and abuts against the end part of the thimble;
pressure filling: pushing the thimble away from the initial position through the plunger to ensure that the interior of the shell is communicated with the gas circuit of the plunger; and then pressure filling is carried out, after the pressure is stable, the shell sleeve and the shell are loosened, in the loosening process, the thrust of the plunger on the ejector pin is reduced, the ejector pin moves outwards under the counterforce of the spring, finally, the sealing element at the head of the ejector pin seals the small hole under the counterforce of the spring, and the pressure filling is finished.
As a further improvement of the above technical solution:
after pressure filling, the welding of the small holes is carried out again: and carrying out laser welding or electron beam welding between the end head of the thimble and the small hole.
Compared with the prior art, the invention has the advantages that:
according to the pressure reference device for leakage detection, the pressure reference cavity is provided with the pressure inlet assembly, the pressure inlet assembly is arranged on the pressure inlet assembly, and the pressure assembly is arranged on the pressure inlet assembly; the integral device has the advantages of simple structure, simple and convenient operation and good sealing effect.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pressing assembly according to an embodiment of the present invention.
Illustration of the drawings: 1. a pressure reference chamber; 2. a housing; 3. a shell; 4. a plunger; 5. an adjusting block; 6. a thimble; 7. a spring; 8. a seal member; 9. and (5) sealing rings.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, the pressure reference device for leak detection according to the embodiment of the present invention includes a pressure reference chamber 1, a pressure inlet assembly and a pressurizing assembly; one end of the pressure reference cavity 1 is opened, the pressure inlet assembly comprises a shell 2, a thimble 6 and an adjusting block 5, one end of the shell 2 is opened and is butted with the opening part of the pressure reference cavity 1 through welding, the other end of the shell 2 is provided with a small hole, the adjusting block 5 is positioned in the shell 2 and is provided with a vent hole, one end of the thimble 6 is connected with the adjusting block 5, the other end of the thimble 6 is positioned in the small hole, one end of the thimble 6 in the small hole is provided with a convex ring, a spring 7 is sleeved on the thimble 6 between the adjusting block 5 and the convex ring, and a sealing element 8 is sleeved on the thimble 6 between the convex ring and the small hole; the pressurizing assembly comprises a shell 3 and a plunger 4, the shell 3 is connected with the shell 2, one end of the plunger 4 is hermetically arranged in the shell 2, and the other end of the plunger 4 extends out of the shell 3; the middle part of plunger 4 is equipped with the plunger hole, and plunger 4 is provided with the boss in the inside one end of shell 2, and the tip of boss offsets with the other end of thimble 6, and the week side of boss sets up the air guide hole that is linked together with the plunger hole.
According to the pressure reference device for leakage detection, the pressure reference cavity 1 is provided with the pressure inlet assembly, the pressure inlet assembly is further provided with the pressure assembly, after the pressure assembly fills standard pressure into the pressure reference cavity 1 through the pressure inlet assembly, the elastic force of the spring 7 of the pressure inlet assembly and the pressure in the pressure reference cavity 1 drive the convex ring of the thimble 6 to compact the sealing element 8 on the periphery of the small hole, so that the pressure is stabilized, accurate pressure sealed in the pressure reference cavity 1 is guaranteed, and the pressure is not leaked; the integral device has the advantages of simple structure, simple and convenient operation and good sealing effect.
In a specific embodiment, the inside of the housing 2 is provided with an internal thread, the adjusting block 5 is in threaded connection with the internal thread, and the pressure of the spring 7 is adjusted by adjusting the position of the adjusting block 5. Wherein the middle part of regulating block 5 is provided with the through-hole, and the one end of thimble 6 is located the through-hole, and wherein the through-hole is used for retraining thimble 6, prevents that it from rocking about.
In a specific embodiment, the plunger 4 is provided with a sealing ring 9 at the periphery of one end of the housing 2 for sealing with the inner wall of the housing 2. The outside of the other end of the shell 2 is provided with an external thread, and the inner side of the shell 3 is in threaded connection with the external thread of the shell 2, so that the connection is simple, convenient and reliable. In addition, the outer side of the other end of the shell 2 is provided with a groove which has a guiding function.
Embodiments of the present invention also provide a pressure sensor including a pressure reference device for leak detection as described above, and also have the advantages of the pressure reference device for leak detection as described above.
The embodiment of the invention also discloses an assembly method of the pressure reference device for leakage detection, which comprises the following steps:
assembling the pressure inlet assembly: firstly, sleeving a sealing element 8 on the other end of the thimble 6, then integrally placing the thimble 6 into the shell 2, and inserting the other end of the thimble 6 into a small hole in the front part of the shell 2; then, a spring 7 is sleeved on the middle part of the thimble 6, and finally, the adjusting block 5 is screwed in to adjust the pressure;
welding the pressure inlet assembly: after the integral assembly of the pressure inlet assembly is completed, an opening at one end of the shell 2 is welded at an opening part of the pressure reference cavity 1 in a laser welding or electron beam welding mode;
assembling the pressurizing assembly: connecting the shell 3 with the outer shell 2, so that the plunger 4 extends into the inner part of the outer shell 2 and is abutted against the end part of the thimble 6;
pressure filling: the thimble 6 is pushed away from the initial position through the plunger 4, so that the inside of the shell 2 is communicated with the gas circuit of the plunger 4; and then pressure filling is carried out, after the pressure is stabilized, the shell sleeve 3 and the shell 2 are loosened, in the loosening process, the pushing force of the plunger 4 to the ejector pin 6 is reduced, the ejector pin 6 moves outwards under the reaction force of the spring 7, finally, the sealing element 8 at the head of the ejector pin 6 is sealed by the reaction force of the spring 7 to seal the small hole, and the pressure filling is finished.
In one embodiment, after pressure filling, the keyhole welding is performed: and laser welding or electron beam welding is carried out between the end of the thimble 6 and the small hole, so that the sealing effect is further ensured.
The invention is further illustrated by the following specific examples in which:
the first step is as follows: design and manufacture of pressure inlet assembly
The external thread is arranged at the position, close to the air inlet, outside the shell 2 of the pressure inlet assembly and is used for locking and buckling a shell sleeve 3 (also called a thread sleeve, the same applies below) of the pressure inlet assembly; the groove of the inner wall of the front part of the shell 2 has the guiding function, the roughness of the inner wall of the front part is better than 1.6, and the groove is used for sealing a sealing ring 9 of the pressurizing assembly.
The small hole in the front of the shell 2 is used for limiting the thimble 6, and the clearance between the small hole and the thimble 6 is less than 0.1 mm. And after the pressure filling is finished, the end surface of the thimble 6 is welded with the small hole. Wherein, the head of the thimble 6 is sleeved with a sealing ring 9 or a sealing gasket, the middle part of the thimble 6 is sleeved with a spring 7, and the acting force of the spring 7 is adjusted by the adjusting block 5. The adjusting block 5 is fixed on the internal thread inside the shell 2, a through hole is formed in the center of the adjusting block and used for restraining the thimble 6 and preventing the thimble from shaking left and right.
When the pressure inlet assembly is assembled, the head part of the thimble 6 is sleeved with the sealing element 8, then the whole is put into the shell 2, and the end of the thimble 6 is inserted into the small hole at the front part of the shell 2. Then, a spring 7 is sleeved on the middle part of the thimble 6, and finally the adjusting block 5 is screwed in to adjust the pressure, wherein the pressure enables the sealing gasket to be compressed to play a role of sealing air; on the other hand, the sealing element 8 can be compressed under the pushing force of the pressurization interface plunger 4 to lose the sealing effect.
The second step is that: welding of pressure inlet assembly
After the integral assembly of the pressure inlet assembly is completed, the pressure inlet assembly is welded at the opening part of the pressure reference cavity 1 in a laser welding or electron beam welding mode.
The third step: design and manufacture of pressurizing assembly
The thread sleeve is provided with internal threads and is used for screwing on the external threads of the pressure inlet interface, and the plunger 4 is plugged into the front part of the outer shell by utilizing the screwing force of the threads. A plunger hole in the center of the plunger 4 is communicated with an air guide hole of the front boss; the diameter of the boss is smaller than the outer diameter of the end of the pressure inlet connector thimble 6; wherein, the plunger 4 is sleeved with a sealing ring 9 which is used for sealing in the process of pressure filling and preventing pressure leakage.
The fourth step: pressure filling
Before pressure filling, the pressurizing assembly is arranged on the pressure inlet assembly, so that good sealing between a sealing surface of a plunger 4 of the pressurizing assembly and a sealing surface of the pressure inlet assembly is ensured, the plunger 4 of the pressurizing assembly pushes an ejector pin 6 of the pressure inlet assembly away from an initial position, and the inside of the pressure inlet assembly is ensured to be communicated with a gas circuit of the plunger 4. The pressure filling device is a high-precision pressure controller, the pressure control precision is 0.02% FS, and the pressure filling precision of the pressure reference cavity 1 is effectively guaranteed. When the pressure controller displays that the pressure is stable, the threaded sleeve is screwed off the shell 2, in the process of screwing off the threaded sleeve, the thrust of the plunger 4 to the head of the thimble 6 is reduced, the thimble 6 moves outwards under the reaction force of the spring 7, finally, the sealing element 8 at the head of the thimble 6 is sealed on the air inlet by the reaction force of the spring 7, and the end face of the head of the thimble 6 and the end face of the air inlet are positioned on the same plane. At the moment, the pressure controller releases the pressure, and the pressure filling is finished.
The fifth step: welding of air inlets
After the pressure filling is finished, a sealing element 8 at the head of the thimble 6 seals an air inlet (small hole) under the action of a spring 7 on one hand, and further seals the air inlet under the action of the pressure reference cavity 1 on the other hand, but micro leakage is inevitable, and in order to ensure the stability of the pressure of the reference cavity, the end of the thimble 6 is subjected to laser welding or electron beam welding. The welding process is as follows: firstly, spot welding is carried out on a circular seam, at least three welding spots are spot-welded, the effect of initial fixation is achieved on the thimble 6, the spot welding heat is small, and the influence on sealing is small; and then the circular seam is integrally welded, and finally the high-stability and high-precision pressure reference cavity 1 is manufactured.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A pressure reference device for leak detection, comprising a pressure reference chamber (1), a pressure inlet assembly and a pressurizing assembly; one end of the pressure reference cavity (1) is open, the pressure inlet assembly comprises a shell (2), an ejector pin (6) and an adjusting block (5), the opening of one end of the shell (2) is in butt joint with the opening of the pressure reference cavity (1), the other end of the shell (2) is provided with a small hole, the adjusting block (5) is located inside the shell (2) and is provided with a vent hole, one end of the ejector pin (6) is connected with the adjusting block (5), the other end of the ejector pin is located in the small hole, one end of the ejector pin (6) in the small hole is provided with a convex ring, a spring (7) is sleeved on the ejector pin (6) between the adjusting block (5) and the convex ring, and a sealing element (8) is sleeved on the ejector pin (6) between the convex ring and the small hole; the pressurizing assembly comprises a shell (3) and a plunger (4), the shell (3) is connected with the shell (2), one end of the plunger (4) is hermetically arranged in the shell (2), and the other end of the plunger extends out of the shell (3); the middle part of the plunger (4) is provided with a plunger hole, one end of the plunger (4) in the shell (2) is provided with a boss, the end part of the boss is abutted against the other end of the thimble (6), and the periphery of the boss is provided with an air guide hole communicated with the plunger hole.
2. The pressure reference device for leak detection according to claim 1, characterized in that the inside of the housing (2) is provided with an internal thread, with which the adjusting block (5) is screwed for adjusting the pressure of the spring (7).
3. The pressure reference device for leak detection according to claim 2, wherein a through hole is provided in the middle of the adjusting block (5), and one end of the thimble (6) is located in the through hole.
4. A pressure reference arrangement for leak detection according to claim 1, 2 or 3, characterised in that the plunger (4) is provided with a sealing ring (9) on the peripheral side of one end of the housing (2) for sealing against the inner wall of the housing (2).
5. A pressure reference device for leak detection according to claim 1, 2 or 3, characterized in that the outer side of the other end of the housing (2) is provided with an external thread, and the inner side of the shell (3) is screwed with the external thread of the housing (2).
6. The pressure reference device for leak detection according to claim 5, characterized in that the outside of the other end of the housing (2) is provided with a bevel.
7. The pressure reference device for leak detection according to claim 1 or 2, wherein an opening at one end of the housing (2) is butted with an opening of the pressure reference chamber (1) by welding.
8. A pressure sensor comprising a pressure reference device for leak detection as claimed in any one of claims 1 to 7.
9. A method of assembling a pressure reference device for leak detection according to any one of claims 1 to 7, comprising the steps of:
assembling the pressure inlet assembly: firstly, sleeving a sealing element (8) at the other end of the thimble (6), then integrally placing the thimble into the shell (2), and inserting the other end of the thimble (6) into a small hole at the front part of the shell (2); then, a spring (7) is sleeved on the middle part of the thimble (6), and finally, an adjusting block (5) is screwed in to adjust the pressure;
welding the pressure inlet assembly: after the integral assembly of the pressure inlet assembly is completed, an opening at one end of the shell (2) is welded at an opening part of the pressure reference cavity (1) in a laser welding or electron beam welding mode;
assembling the pressurizing assembly: connecting the shell sleeve (3) with the outer shell (2) so that the plunger (4) extends into the outer shell (2) and abuts against the end part of the thimble (6);
pressure filling: the thimble (6) is pushed away from the initial position through the plunger (4), so that the inside of the shell (2) is communicated with the gas path of the plunger (4); and then pressure filling is carried out, after the pressure is stabilized, the shell sleeve (3) and the shell (2) are loosened, in the loosening process, the pushing force of the plunger (4) to the ejector pin (6) is reduced, the ejector pin (6) moves outwards under the reaction force of the spring (7), finally, the sealing element (8) at the head part of the ejector pin (6) is sealed by the reaction force of the spring (7), and the pressure filling is finished.
10. The method of assembling a pressure reference device for leak detection as defined in claim 9, wherein after the pressure filling, the welding of the small hole is further performed: and performing laser welding or electron beam welding between the end of the thimble (6) and the small hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111675116.1A CN114264431A (en) | 2021-12-31 | 2021-12-31 | Pressure reference device for leak detection, assembly method and pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111675116.1A CN114264431A (en) | 2021-12-31 | 2021-12-31 | Pressure reference device for leak detection, assembly method and pressure sensor |
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| Publication Number | Publication Date |
|---|---|
| CN114264431A true CN114264431A (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111675116.1A Pending CN114264431A (en) | 2021-12-31 | 2021-12-31 | Pressure reference device for leak detection, assembly method and pressure sensor |
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| WO2021227845A1 (en) * | 2020-05-12 | 2021-11-18 | 浙江盾安人工环境股份有限公司 | Charging valve and air conditioner system having same |
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2021
- 2021-12-31 CN CN202111675116.1A patent/CN114264431A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020170597A1 (en) * | 2000-12-28 | 2002-11-21 | Colussi Rafael A. | Pressure-controlled three-way valve device for transport vehicle tires and remote pressure control method |
| CN2623997Y (en) * | 2003-04-09 | 2004-07-07 | 大捷达实业（深圳）有限公司 | Tire inflation coupler |
| US20080115838A1 (en) * | 2006-11-22 | 2008-05-22 | Tien-Tsai Huang | Inflation valve |
| CN101109463A (en) * | 2007-08-10 | 2008-01-23 | 四川大学 | General explosion-proof pressure-limit air valve for automobile tyre |
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| CN106799938A (en) * | 2017-03-06 | 2017-06-06 | 大连职业技术学院 | A kind of Tire Pressure Monitor System |
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| WO2021227845A1 (en) * | 2020-05-12 | 2021-11-18 | 浙江盾安人工环境股份有限公司 | Charging valve and air conditioner system having same |
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