A device and system for detecting the sealing performance of a lip seal

Abstract

The application discloses a device for detecting the sealing performance of a lip-shaped sealing ring, which comprises a left end cover, a valve body and a right end cover. The left end cover is uniformly provided with N first through holes on the outer side of the edge thereof, and is symmetrically provided with two first positioning holes on the outer side of the edge thereof; the inner side of the left end cover extends outward to form a hollow boss; and the middle part of the left end cover is provided with an air inlet hole. The valve body is symmetrically provided with N second through holes and two second positioning holes, which are adapted to the first through holes. The right end cover is uniformly provided with N third through holes on the outer side of the edge thereof, which are adapted to the first through holes. The left end cover, the valve body and the right end cover are sequentially sleeved. The positioning of the valve body and the left end cover is realized through a guide pin. A winding gasket is arranged between one side of the valve body and the left end cover and one side of the right end cover. A first adjusting gasket or a second adjusting gasket is sleeved between the right end cover and the valve body. The first adjusting gasket / second adjusting gasket, the valve body and the left end cover are provided with a containing space for containing the lip-shaped sealing ring. The application further discloses a system for detecting the sealing performance of a lip-shaped sealing ring.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of sealing detection, and particularly relates to a device and system for detecting the sealing performance of a lip-shaped sealing ring. BACKGROUND

[0002] Chemical raw material liquid gas storage has specific storage conditions, such as the storage condition of liquid oxygen is low-temperature high-pressure compression, and the liquid oxygen is converted into gas and released when decompression and temperature rising, so that a low-temperature pressure container is used for storing and transporting liquid ethylene, liquefied natural gas, liquid nitrogen, liquid oxygen, liquid hydrogen and other liquid gases. The low-temperature pressure container must use a valve. The ultra-low temperature ball valve is widely used in the low-temperature pressure container due to the characteristics of good sealing, high reliability, small fluid resistance, long service life, rapid switching and the like.

[0003] The sealing performance is a key factor for the reliable operation of the ball valve in a specified temperature range, and is important for the safety factor of the gas fuel. At present, the minimum temperature requirement reaches-163 DEG C in the liquefied natural gas field, and reaches-196 DEG C in the liquid nitrogen application field, which requires higher requirements on the sealing structure and material.

[0004] At present, all the industry standards about the ultra-low temperature ball valve in China specify the allowable leakage of the valve seat. This means that the valve seat leakage will pass through two possible leakage paths: 1, the connection between the valve seat and the valve ball; 2, the sealing place of the valve seat and the valve body.

[0005] Once the valve seat of the ultra-low temperature ball valve is detected to have a leakage exceeding the industry standard, it is difficult to determine whether the sealing layer at the connection between the valve seat and the valve ball leaks or the lip-shaped sealing ring at the sealing place of the valve seat and the valve body leaks. Since the sealing performance of the sealing layer at the connection between the valve seat and the valve ball is not easy to detect, how to detect the sealing performance of the lip-shaped sealing ring becomes a problem to be solved. After preliminary search, no device and system for detecting the sealing performance of the lip-shaped sealing ring are found. SUMMARY

[0006] The application aims at improving the prior art, that is, the application discloses a device and system for detecting the sealing performance of a lip-shaped sealing ring.

[0007] Technical scheme: A device for detecting the sealing performance of a lip-shaped sealing ring comprises:

[0008] A left end cover is uniformly provided with N first through holes on the edge outer side, and is symmetrically provided with two first positioning holes on the edge outer side, and the inner side of the left end cover extends outward to form a hollow boss, and the middle part of the left end cover is provided with an air inlet hole, wherein N is an integer not less than 3;

[0009] a valve body, which is annular in whole, symmetrically provided with N second through holes corresponding to the first through holes, and symmetrically provided with two second positioning holes on one side of the valve body;

[0010] a right end cover, which is uniformly provided with N third through holes corresponding to the first through holes on the outer edge of the right end cover, wherein:

[0011] the left end cover, the valve body and the right end cover are sequentially sleeved and fixed by studs and nuts;

[0012] the positioning of the valve body and the left end cover is realized by guide pins arranged in the first positioning holes and the second positioning holes;

[0013] a winding pad is arranged between the valve body and one side of the left end cover and one side of the right end cover, respectively;

[0014] a first adjusting pad or a second adjusting pad is sleeved between the right end cover and the valve body, for simulating the condition of no slip or slip;

[0015] a containing space for accommodating a lip-shaped sealing ring is arranged between the first adjusting pad, the valve body and the left end cover, or

[0016] a containing space for accommodating a lip-shaped sealing ring is arranged between the second adjusting pad, the valve body and the left end cover.

[0017] Further, a thermocouple is arranged in the valve body.

[0018] Further, the outer edge of the left end cover is uniformly provided with three first through holes.

[0019] Further, the outer edge of the left end cover is uniformly provided with twelve first through holes.

[0020] A system for detecting the sealing performance of a lip-shaped sealing ring, comprising:

[0021] a test container, which is provided with an incubator cover at the top of the test container to form a closed space, and is provided with a device for detecting the sealing performance of a lip-shaped sealing ring in the closed space, and the closed space is filled with liquid nitrogen;

[0022] a helium cylinder, which is provided with a gas pressure gauge, and is connected with a first gas outlet pipe, the first gas outlet pipe is sequentially provided with a cylinder adjusting valve and a first needle valve, and the first gas outlet pipe is connected with an air inlet hole of the device for detecting the sealing performance of a lip-shaped sealing ring, the test container is provided with a second gas outlet pipe, the second gas outlet pipe is provided with a second needle valve, and the second gas outlet pipe is connected with an alcohol bubble meter, and the alcohol bubble meter is provided with a third gas outlet pipe which is connected with the atmosphere;

[0023] The temperature monitoring device is connected with the thermocouple of the device for detecting the sealing performance of the lip-shaped sealing ring.

[0024] Further, the second air outlet pipe is further provided with a venting pipe, and the venting pipe is provided with a venting valve.

[0025] Beneficial effects: the device and system for detecting the sealing performance of the lip-shaped sealing ring have the following beneficial effects:

[0026] 1. Other factors affecting the sealing performance of the valve can be excluded, and the sealing performance of the lip-shaped sealing ring is independent.

[0027] 2. The sealing performance of the lip-shaped sealing ring under two working conditions of valve seat with and without sliding can be simulated.

[0028] 3. The valve cavity of the real ball valve is relatively large, and a relatively large amount of test medium helium is required, and the application can reduce the use amount of the test medium helium and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 For no sliding, the cross-sectional view of the device for detecting the sealing performance of the lip-shaped sealing ring is disclosed.

[0030] Figure 2 For sliding, the cross-sectional view of the device for detecting the sealing performance of the lip-shaped sealing ring is disclosed.

[0031] Figure 3 For the device for detecting the sealing performance of the lip-shaped sealing ring, the three-dimensional schematic view is disclosed.

[0032] Figure 4 For the left end cover, the three-dimensional schematic view is disclosed.

[0033] Figure 5 For the valve body, the three-dimensional schematic view is disclosed.

[0034] Figure 6 For the right end cover, the three-dimensional schematic view is disclosed.

[0035] Figure 7 For the first adjusting pad, the three-dimensional schematic view is disclosed.

[0036] Figure 8 For the lip-shaped sealing ring, the three-dimensional schematic view is disclosed.

[0037] Figure 9 For the winding pad, the three-dimensional schematic view is disclosed.

[0038] Figure 10 For the system for detecting the sealing performance of the lip-shaped sealing ring, the schematic view is disclosed.

[0039] Wherein:

[0040]

[0041] DETAILED DESCRIPTION

[0042] The specific embodiments of the present application are described in detail below. Specific embodiment 1

[0044] As shown in Figure 1 , Figures 3-9 A device for detecting the sealing performance of a lip seal, comprising:

[0045] A left end cover 1, the outer edge of which is uniformly provided with N first through holes, and the outer edge of the left end cover 1 is also symmetrically provided with two first positioning holes 1a, and the inner side of the left end cover 1 extends outward to form a hollow boss, and the middle part of the left end cover 1 is provided with an air inlet hole 1b, wherein N is an integer not less than 3;

[0046] A valve body 2, which is annular as a whole, and the valve body 2 is symmetrically provided with N second through holes adapted to the first through holes, and one side of the valve body 2 is symmetrically provided with two second positioning holes 2a;

[0047] A right end cover 3, the outer edge of which is uniformly provided with N third through holes adapted to the first through holes, wherein:

[0048] The left end cover 1, the valve body 2, and the right end cover 3 are sequentially sleeved and fixed by studs 7 and nuts 8;

[0049] The positioning of the valve body 2 and the left end cover 1 is realized by guide pins arranged in the first positioning holes 1a and the second positioning holes 2a;

[0050] A winding pad 6 is arranged between the valve body 2 and one side of the left end cover 1 and one side of the right end cover 3, respectively;

[0051] A first adjusting pad 4 is sleeved between the right end cover 3 and the valve body 2, for simulating the case of no slip;

[0052] The first adjusting pad 4, the valve body 2, and the left end cover 1 are provided with a containing space for containing a lip seal 5.

[0053] Further, a thermocouple is arranged in the valve body 2.

[0054] In this embodiment, the outer edge of the left end cover 1 is uniformly provided with twelve first through holes.

[0055] As shown in Figure 10 A system for detecting the sealing performance of a lip seal, comprising:

[0056] The test container 31 has an insulated box cover 32 on top to form a sealed space. The sealed space is equipped with a device 10 for testing the sealing performance of the lip seal ring, and the sealed space is filled with liquid nitrogen.

[0057] Helium cylinder 20 is equipped with a pressure gauge 61. A first outlet pipe is connected to the helium cylinder 20. A cylinder regulating valve 62 and a first needle valve 63 are sequentially installed on the first outlet pipe. The first outlet pipe is connected to the air inlet 1b of the device 10 for detecting the sealing performance of the lip seal ring. The test container 31 is equipped with a second outlet pipe and a second needle valve 64. An alcohol bubble meter 40 is connected to the second outlet pipe. The alcohol bubble meter 40 is equipped with a third outlet pipe that communicates with the atmosphere.

[0058] Temperature monitoring device 50 is connected to a thermocouple of device 10 for detecting the sealing performance of lip seal ring.

[0059] Furthermore, the second vent pipe is also provided with a vent pipe, and the vent pipe is provided with a vent valve 65. Specific Implementation Example 2

[0061] like Figures 2-9 As shown, an apparatus for testing the sealing performance of a lip seal includes:

[0062] The left end cover 1 has N first through holes evenly provided on its outer edge. The left end cover 1 also has two first positioning holes 1a symmetrically provided on its outer edge. The inner side of the left end cover 1 extends outward to form a hollow boss. The middle part of the left end cover 1 has an air inlet 1b, where N is an integer not less than 3.

[0063] The valve body 2 is generally annular, and the valve body 2 is symmetrically provided with N second through holes that are adapted to the first through hole. Two second positioning holes 2a are symmetrically provided on one side of the valve body 2.

[0064] The right end cap 3 has N third through holes evenly distributed on its outer edge, corresponding to the first through hole, wherein:

[0065] The left end cap 1, the valve body 2, and the right end cap 3 are sequentially sleeved together and fixed by studs 7 and nuts 8;

[0066] The valve body 2 and the left end cover 1 are positioned by guide pins set in the first positioning hole 1a and the second positioning hole 2a.

[0067] A winding pad 6 is provided between the valve body 2 and one side of the left end cover 1 and one side of the right end cover 3, respectively;

[0068] A second adjusting pad 9 is sleeved between the right end cover 3 and the valve body 2, for simulating the situation of existing slip.

[0069] The second adjusting pad 9, the valve body 2 and the left end cover 1 are provided with a containing space containing the lip-shaped sealing ring 5.

[0070] Further, the valve body 2 is provided with a thermocouple.

[0071] Further, the edge of the left end cover is uniformly provided with twelve first through holes.

[0072] In another embodiment, the edge of the left end cover 1 is uniformly provided with three first through holes.

[0073] In yet another embodiment, the edge of the left end cover 1 is uniformly provided with eight first through holes.

[0074] A system for detecting the sealing performance of a lip-shaped sealing ring, comprising:

[0075] A test container 31 is provided with a heat preservation box cover 32 at the top of the test container 31 to form a closed space, and a device 10 for detecting the sealing performance of a lip-shaped sealing ring is arranged in the closed space, and the closed space is filled with liquid nitrogen;

[0076] A helium cylinder 20 is provided with a gas pressure gauge 61, and the helium cylinder 20 is connected with a first gas outlet pipe, which is sequentially provided with a cylinder adjusting valve 62 and a first needle valve 63, and the first gas outlet pipe is connected with the gas inlet hole 1b of the device 10 for detecting the sealing performance of a lip-shaped sealing ring, and the test container 31 is provided with a second gas outlet pipe, which is provided with a second needle valve 64, and the second gas outlet pipe is connected with an alcohol bubble meter 40, and the alcohol bubble meter 40 is provided with a third gas outlet pipe which is connected with the atmosphere.

[0077] A temperature monitoring device 50 is connected with the thermocouple of the device 10 for detecting the sealing performance of a lip-shaped sealing ring.

[0078] Further, the second gas outlet pipe is further provided with an emptying pipe, and the emptying pipe is provided with an emptying valve 65.

[0079] The winding pads 6 are respectively arranged between the left end cover 1 and the valve body 2, and between the valve body 2 and the right end cover 3, to ensure the sealing performance.

[0080] In use, only the right end cover 3 needs to be disassembled, and the first adjusting pad 4 or the second adjusting pad 9 can be replaced, and the sealing performance of the lip-shaped sealing ring 5 under the two working conditions of valve seat with slip and without slip can be simulated.

[0081] The embodiments of the present application have been described in detail. However, the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A system for testing the sealing performance of a lip seal, characterized in that, include: The test container has an insulated lid on top to form a sealed space. A device for testing the sealing performance of the lip seal is installed in the sealed space, and the sealed space is filled with liquid nitrogen. A helium cylinder is equipped with a pressure gauge. The helium cylinder is connected to a first outlet pipe. The first outlet pipe is equipped with a cylinder regulating valve and a first needle valve in sequence. The first outlet pipe is connected to the air inlet of the device for detecting the sealing performance of the lip seal ring, which is equipped with a lip seal ring. The test container is equipped with a second outlet pipe and a second needle valve. The second outlet pipe is connected to an alcohol bubble meter. The alcohol bubble meter is equipped with a third outlet pipe that is open to the atmosphere. A temperature monitoring device is connected to a thermocouple of the device for detecting the sealing performance of the lip seal ring, which is equipped with a lip seal ring. The device for detecting the sealing performance of the lip seal includes: The left end cap has N first through holes evenly distributed on its outer edge. The left end cap also has two first positioning holes symmetrically distributed on its outer edge. The inner side of the left end cap extends outward to form a hollow boss. The middle part of the left end cap has an air inlet. N is 3 or 12. The valve body is generally annular, and the valve body is symmetrically provided with N second through holes that are adapted to the first through hole. Two second positioning holes are symmetrically provided on one side of the valve body. The right end cap has N third through holes evenly distributed on its outer edge, corresponding to the first through hole, wherein: The left end cap, the valve body, and the right end cap are sequentially sleeved together and fixed by studs and nuts; The valve body and the left end cover are positioned by guide pins set in the first positioning hole and the second positioning hole; A winding pad is provided between the valve body and one side of the left end cover and one side of the right end cover, respectively; A first adjusting pad or a second adjusting pad is fitted between the right end cover and the valve body to simulate the situation where the valve seat has no slippage or the valve seat has slippage. The valve body is equipped with a thermocouple; A receiving space for accommodating a lip seal ring is provided between the first adjusting pad, the valve body, and the left end cap, or A receiving space for accommodating a lip seal is provided between the second adjusting pad, the valve body, and the left end cover.

2. The system for detecting the sealing performance of a lip seal according to claim 1, characterized in that, The second vent pipe is also equipped with a drain pipe, and the drain pipe is equipped with a drain valve.

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