CN110006596B - Static seal leakage detection device - Google Patents
Static seal leakage detection device Download PDFInfo
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- CN110006596B CN110006596B CN201910320484.0A CN201910320484A CN110006596B CN 110006596 B CN110006596 B CN 110006596B CN 201910320484 A CN201910320484 A CN 201910320484A CN 110006596 B CN110006596 B CN 110006596B
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000003068 static effect Effects 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 62
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000002265 prevention Effects 0.000 claims description 11
- 230000000670 limiting effect Effects 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 2
- 238000011896 sensitive detection Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012502 risk assessment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model provides a static seal leakage detection device, come the leakage condition of sign sealing strip through the signal of telecommunication, the sealing strip sets up between upper cover and box, it is provided with the sensor group of compriseing a plurality of sensors to lie in the sealing strip contact area on the box up end, every sensor includes positive plate and negative plate by insulating sheet metal partition, wherein, external power supply's positive pole is connected to each positive plate, external power supply's negative pole is connected to each negative plate, whole circuit is the state of opening circuit under the normal no leakage state, when leaking the emergence, the conducting liquid medium covers insulating sheet metal top, positive plate and negative plate switch on. The device has the advantages of sensitive detection, simple operation and the like.
Description
Technical Field
The invention belongs to the technical field of static seal leakage detection, and particularly relates to a static seal leakage detection device which is suitable for potential leakage risk assessment and leakage detection of a sealing strip under a conductive liquid medium.
Background
Static seals refer to seals in which the sealing interfaces do not slide relative to one another and the mating surfaces are relatively stationary. The sealing element is usually arranged between the sealing end faces, is soft in texture, has good rebound resilience and following performance, and can fill up tiny gaps of the sealing end faces to achieve the sealing effect. However, due to the influence of factors such as assembly error, mechanical properties of materials, external working conditions and the like, the sealing system can leak sealing media. The leakage influences the normal working operation of mechanical equipment, the sealing performance and the leakage condition of the sealing element are detected in advance, the leakage risk of the sealing element is evaluated, and the faults, economic losses and casualties of the mechanical equipment can be effectively avoided.
The leakage detection method is multiple, air pressure detection is generally adopted for a gas medium, the pressure in a sealing cavity is reduced due to gas leakage, and the pressure change in the sealing cavity is detected by additionally arranging a pressure gauge. The liquid medium can observe the liquid leakage condition, and the leakage detection can be realized by means of external collection devices and the like. For the air pressure detection method, except for the leakage of a sealing interface, air leakage may occur at an air inlet, a pressure gauge interface and the like, so that the reading of the pressure gauge is reduced, and the detection is inaccurate. For liquid leakage detection, the viscosity of liquid per se is large compared with that of gas, the leakage amount is small particularly for static sealing, the leaked liquid is difficult to directly observe, and the leaked liquid is difficult to collect. This presents certain difficulties for liquid medium leak detection.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a static seal leakage detection device which can detect the static seal leakage condition and accurately position.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a static seal leakage detection device, the sealing strip sets up between upper cover 1 and box 7, a serial communication port, it is provided with the sensor group 8 of constituteing by a plurality of sensors to lie in the sealing strip contact area on 7 up ends of box, every sensor includes positive plate and negative plate by insulating sheet metal partition, wherein, external power supply's positive pole is connected to each positive plate, external power supply's negative pole is connected to each negative plate, whole circuit is the state of opening circuit under the normal no leakage state, when leaking the emergence, the conducting liquid medium covers insulating sheet metal top, positive plate and negative plate switch on.
The last edge of box 7 is provided with negative pole metal strip 10 and anodal metal strip 11, and wherein each positive plate connects external power supply's positive pole through anodal metal strip 11, and each negative plate connects external power supply's negative pole through negative pole metal strip 10, and wherein between every positive plate and anodal metal strip 11, perhaps between every negative plate and negative pole metal strip 10, all connect a emitting diode 6, between anodal metal strip 11 and external power supply's positive pole, perhaps between negative pole metal strip 10 and external power supply's negative pole, be connected with the ampere meter.
The cross section of the box body 7 is square, the sensors are arranged on three boundaries of the upper end face of the box body 7, the anode metal strip 11 and the cathode metal strip 10 are also arranged on the three boundaries, and the cathode metal strip 10 and the anode metal strip 11 are located at different heights.
Three borders of box 7 are provided with negative pole metal strip draw-in groove 24 and anodal metal strip draw-in groove 15, are equipped with 3 metal strip fixed position 12 on every border, and it has multiunit sensor draw-in groove 13 to distribute on three borders in the sealing strip contact area, and the length of adjacent sensor draw-in groove 13 is linear degressive in proper order for the measuring position distributes in whole sealing strip contact area, is provided with the protruding 14 of overload prevention in the sealing strip contact area of no sensor draw-in groove 13, is asymmetric distribution, is used for the location sealing strip, prevents the reverse installation.
Each group of the sensor clamping grooves 13 consists of a first groove and a second groove, the first groove and the second groove are equal in length and are used for placing the positive plate and the negative plate respectively, the first groove and the second groove are spaced by 0.5mm,
be provided with the holder 5 of right angle U-shaped along the outside on the box 7, the centre gripping is in three border on, wherein be provided with along the outside on the box 7 along the horizontally slide rail 17 of three border direction, wherein the upper portion of holder 5 and the upper surface cooperation of box 7, accompany negative pole metal strip 10 between, the lower part be provided with slide rail 17 complex recess 22, anodal metal strip 11 presss from both sides between recess 22 and slide rail 17, the middle part fretwork of holder 5, each emitting diode 6 is located fretwork department to in order to observe the luminous condition.
Four corners of upper cover 1 are provided with through- hole 19, and 19 peripheries of through-hole are equipped with the recess of placing gasket 2, are provided with stopper 4 above the sealing strip, and 7 up end four corners of box are provided with screw hole 21, and bolt 3 passes through-hole 19, gasket 2, stopper 4 and screw hole 21, is connected with box 7, upper cover 1, box 7, holder 5, stopper 4 are insulating material.
The contact area of the sealing strip is lengthened, two overload prevention protrusions 20 are arranged at four corners of the contact area, and when overload occurs, the two overload prevention protrusions 20 are in surface contact with the box body 7, so that direct bearing of the sensor is avoided.
Compared with the prior art, the invention has the beneficial effects that:
the device detects the leakage condition of the sealing interface, and well avoids the influence of leakage at other positions.
The device can detect the condition of liquid medium infiltration of different positions of the sealing contact surface, can measure the liquid leakage condition, and under the condition that the sealing strip has no leakage, the sensor can detect the existence of the liquid medium in the sealing area, namely can evaluate the potential leakage risk.
By replacing the limiting block, different loads can be loaded to carry out leakage test on the sealing strip.
The electric signal can detect the existence of the liquid medium at the contact position of the sealing strip with high sensitivity.
Drawings
Fig. 1 is a schematic structural view (perspective view) of the present invention.
Fig. 2 is a schematic view (longitudinal sectional view) of the structure of the present invention.
Fig. 3 is a longitudinal sectional view of the case of the present invention.
FIG. 4 is a top view of the housing of the present invention.
Fig. 5 is a schematic view (perspective view) of the structure of the holder of the present invention.
Fig. 6 is a bottom view of the upper cover of the present invention.
Fig. 7 is a side view of the upper cover of the present invention.
Fig. 8 is a perspective view of the upper cover of the present invention.
Detailed Description
In order to make the working principle and the structural features of the leak detection device easy to understand, the device is further explained below with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 and 2, the static seal leakage detection device of the invention comprises an upper cover 1 and a box body 7, wherein the cross section of the box body 7 is square, and a sealing strip is arranged between the upper cover 1 and the box body 7.
A sensor group 8 consisting of a plurality of sensors is provided on the upper end surface of the case 7 at the seal strip contact area, each sensor includes a positive plate and a negative plate separated by an insulating sheet, and the thinner the insulating sheet is, the higher the sensor sensitivity is. Wherein, each positive plate is connected with the positive pole of external power supply, and each negative plate is connected with the negative pole of external power supply, and whole circuit is the state of opening circuit under normal no leakage state, and when the leakage took place, the conducting liquid medium covered the insulating sheet metal top, and the positive plate switches on with the negative plate.
Wherein, each positive plate connects external power supply's positive pole through anodal metal strip 11, each negative plate connects external power supply's negative pole through negative pole metal strip 10, wherein between every positive plate and anodal metal strip 11, perhaps between every negative plate and the negative pole metal strip 10, all connect a emitting diode 6, between anodal metal strip 11 and external power supply's positive pole, perhaps between negative pole metal strip 10 and external power supply's negative pole, be connected with the ampere meter, when positive plate and negative plate switched on, corresponding emitting diode 6 works, the registration appears in the ampere meter on the total road.
Namely, the sensor is used for detecting leakage, the positive/negative pole metal strip is responsible for transmitting an electric signal obtained by the sensor, the ammeter is used for indicating the current change condition on the bus circuit, and the light-emitting diode is used for indicating the leakage position.
Specifically, referring to fig. 3 and 4, the box 7 is a carrier for the sensor, the seal strip, the holder, and the metal strip, and the box 7 is provided with a liquid inlet 9. A sealing strip placing clamping groove 18 with the width of 20mm and the depth of 6mm is formed in the upper end face of the box body 7 and used for positioning and placing the sealing strip. Threaded holes 21 are formed in four corners of the upper end face of the box body 7 and are used for being matched and connected with the upper cover 1.
Three boundaries of the box body 7 are provided with a negative metal strip clamping groove 24 and a positive metal strip clamping groove 15, the outer edges of the three boundaries are provided with horizontal sliding rails 17, the distance between each sliding rail 17 and the upper boundary is 40mm, each side protrudes outwards by 20mm, the outer side of the upper edge of the box body 7 is provided with a right-angled U-shaped clamp holder 5 which is clamped on the three boundaries, and the sliding rails 17 are used for being matched with the clamp holder 5.
The negative metal strip clamping groove 24 is parallel to the positive metal strip clamping groove 15, the positive metal strip clamping groove 15 is located above the sliding rail 17, each boundary is provided with 3 metal strip fixing positions 12 with the length being 8mm and 2mm, the negative metal strip 10 is installed in the metal strip fixing position 12 of the negative metal strip clamping groove 24, the positive metal strip 11 is installed in the metal strip fixing position 12 of the positive metal strip clamping groove 15, 30 groups of sensor clamping grooves 13 are distributed on three boundaries in a sealing strip contact area, the leakage conditions of 30 different positions of the sealing strip contact area can be measured, namely the position conditions of a conductive liquid permeating interface on the sealing strip contact surface are evaluated, and the leakage risk is evaluated. In order to detect the leakage condition of different positions of the contact area of the sealing strip, the lengths of the adjacent sensor clamping grooves 13 are sequentially and linearly decreased in a decreasing manner (sequentially different by 0.5mm), so that the measurement positions are distributed in the whole contact area of the sealing strip. Each group of sensor clamping grooves 13 consists of a first groove and a second groove, the first groove and the second groove are equal in length and are used for placing a positive plate and a negative plate of a sensor respectively, and the interval between the first groove and the second groove is 0.5 mm.
The outer sides of three boundaries of the box body 7 are also provided with light emitting diode mounting grooves 16 for mounting light emitting diodes, and the sealing strip contact area of the sensorless clamping groove 13 is internally provided with overload-proof bulges 14 with the radius of 4mm and the height of 0.5mm, which are asymmetrically distributed and used for positioning the sealing strip and preventing reverse mounting, and the overload-proof bulges are matched with the upper cover 1 to prevent the sensor from being damaged when the load is overlarge.
Referring to fig. 5, the holder 5 is connected to the case 7 through a groove 22 and a bolt 23 for fixing the sensor group 8, the metal strip and the wires and preventing external contaminants from entering the sensor and the inside of the case. The upper part of the clamp is matched with the upper surface of the box body 7, a cathode metal strip 10 is clamped between the upper surface of the box body and the upper surface of the box body, a groove 22 matched with the sliding rail 17 is arranged at the lower part of the clamp, an anode metal strip 11 is clamped between the groove 22 and the sliding rail 17, the middle part of the clamp holder 5 is hollowed out, and each light-emitting diode 6 is positioned at the hollowed-out part so as to observe the light-emitting condition. The positive and negative plate terminals are arranged on the clamper 5 and are used for being connected with an ammeter and an external power supply in series.
Referring to fig. 6, 7 and 8, the upper cover 1 is a cavity structure, and is used for cooperating with the box body 7 to form a complete sealed cavity and fixing the sealing strip, and cooperating with the box body 7 to apply a load to the sealing strip. Through holes 19 are formed in four corners of the sealing strip, grooves for placing the gaskets 2 are formed in the peripheries of the through holes 19, limiting blocks 4 are arranged above the sealing strip, the bolts 3 penetrate through the through holes 19, the gaskets 2, the limiting blocks 4 and the threaded holes 21 and are connected with the box body 7, and the limiting blocks 4 are used for giving compression amount. The contact area of the sealing strip is lengthened, so that the loading and leakage conditions of the sealing strip can be conveniently observed, and the lower surface of the upper cover 1 is prevented from being contacted with the upper part of the clamp 5 or the box body 7. And four corners of the contact area are provided with two overload prevention protrusions 20 with the radius of 4mm and the height of 0.5mm, the two overload prevention protrusions 20 are matched with the overload prevention protrusions 14 on the box body, and when overload occurs, the two overload prevention protrusions 20 are in surface contact with the box body 7, so that direct bearing of the sensor is avoided. When the compression amount exceeds the preset value, the sealing contact area on the upper cover 1 is contacted with the second overload prevention protrusion 20, the action is stopped, and the phenomenon that the load is too large and other structures of the sensor and the box body are damaged is prevented.
Considering that an insulating environment needs to be created in the working process of the leakage detection device, the influence of external electromagnetic interference and self current is eliminated, and the upper cover 1, the box body 7, the clamp holder 5 and the limiting block 4 are made of insulating materials.
The working principle of the leakage detection device is as follows: the positive and negative poles of the external power supply are respectively connected with the positive and negative pole metal strips, and an ammeter is connected in series on the positive pole circuit. The sensors are connected in parallel, and the positive circuit of each sensor is provided with a light-emitting diode. The positive and negative plates are separated by a thin insulating material, and the whole circuit is in an open circuit state under a normal non-leakage state, and the ammeter has no number. When the sealing device leaks, when the conductive liquid flows through the surface of the insulating material, the positive and negative electrode plates are conducted, current is formed under the action of external voltage, the light-emitting diode works, and the ammeter generates a reading so as to represent the occurrence of the leakage of the conductive liquid. And 30 groups of sensors are arranged at different positions of the contact area of the sealing strip, so that the leakage condition of the conductive liquid under different penetration depths can be measured, and the conductive liquid can leak out of the box body if the whole circuit is conducted.
The used sealing strip test sample is prepared according to the size and the structural shape of the sealing strip clamping groove of the box body and the upper cover. The size is slightly smaller than the clamping groove, and the position of the limiting hole is consistent with the overload prevention protrusion of the upper cover and the overload prevention protrusion of the box body.
Operating a leakage device:
1. and (4) switching on a circuit, coating conductive liquid on the surface of each sensor, and observing whether the light-emitting diode and the ammeter work normally or not and whether the circuit is normal or not.
2. And (4) disconnecting the circuit, removing the conductive liquid on the surface of the sensor, and placing the sealing strip sample in the sealing strip clamping groove of the box body.
3. The stopper is selected according to a predetermined compression amount.
4. And sequentially assembling the upper cover, the bolt, the gasket, the box body and the clamp holder.
5. And (3) injecting the conductive liquid into the box body through the water inlet by using a pressure pump, and keeping the pressure constant.
6. And (5) switching on the power supply and starting detection.
In order to improve the detection precision, the thickness of the insulating sheet between the positive plate and the negative plate can be properly reduced, and the voltage between the two plates can be increased.
Claims (7)
1. A static seal leakage detection device, a sealing strip is arranged between an upper cover (1) and a box body (7), and is characterized in that a sensor group (8) consisting of a plurality of sensors is arranged on the upper end surface of the box body (7) in a sealing strip contact area, each sensor comprises a positive plate and a negative plate which are separated by an insulating thin plate, wherein each positive plate is connected with the positive electrode of an external power supply, each negative plate is connected with the negative electrode of the external power supply, the whole circuit is in a circuit breaking state under a normal non-leakage state, when leakage occurs, a conductive liquid medium covers the upper part of the insulating thin plate, the positive plate is communicated with the negative plates, a negative metal strip (10) and a positive metal strip (11) are arranged on the upper edge of the box body (7), each positive plate is connected with the positive electrode of the external power supply through the positive metal strip (11), each negative plate is connected with the negative electrode of, the cross-section of the box body (7) is square, each sensor is arranged on three boundaries of the upper end face of the box body (7), the anode metal strip (11) and the cathode metal strip (10) are also arranged on the three boundaries, the cathode metal strip (10) and the anode metal strip (11) are located at different heights, cathode metal strip clamping grooves (24) and anode metal strip clamping grooves (15) are arranged on the three boundaries of the box body (7), 3 metal strip fixing positions (12) are arranged on each boundary, a plurality of groups of sensor clamping grooves (13) are distributed on the three boundaries in a sealing strip contact area, and the lengths of adjacent sensor clamping grooves (13) are linearly decreased in sequence, so that the measuring positions are distributed in the whole sealing strip contact area.
2. The static seal leakage detection device according to claim 1, wherein a light emitting diode (6) is connected between each positive plate and the positive metal strip (11) or between each negative plate and the negative metal strip (10), and an ammeter is connected between the positive metal strip (11) and the positive electrode of the external power supply or between the negative metal strip (10) and the negative electrode of the external power supply.
3. The static seal leakage detecting device according to claim 1, wherein the seal strip contact area of the sensorless card slot (13) is provided with an overload prevention protrusion one (14) which is asymmetrically distributed and used for positioning the seal strip and preventing reverse installation.
4. The static seal leakage detector according to claim 3, wherein each set of sensor slots (13) is composed of a first groove and a second groove, the first groove and the second groove are equal in length and are used for placing the positive plate and the negative plate respectively, and the first groove and the second groove are spaced by 0.5 mm.
5. The static seal leakage detection device according to claim 1, wherein a right-angled U-shaped holder (5) is arranged on the outer side of the box body (7) and is clamped on the three boundaries, a horizontal sliding rail (17) is arranged on the outer side of the box body (7) along the three boundary directions, the upper portion of the holder (5) is matched with the upper surface of the box body (7) and a negative metal strip (10) is clamped between the holder and the upper surface of the box body, a groove (22) matched with the sliding rail (17) is arranged on the lower portion of the holder, a positive metal strip (11) is clamped between the groove (22) and the sliding rail (17), the middle portion of the holder (5) is hollowed out, and each light emitting diode (6) is positioned at the hollowed-out portion so as to observe the light emitting condition.
6. The static seal leakage detection device according to claim 1, wherein through holes (19) are formed in four corners of the upper cover (1), a groove for placing the gasket (2) is formed in the periphery of the through holes (19), the limiting block (4) is arranged above the sealing strip, threaded holes (21) are formed in four corners of the upper end face of the box body (7), the bolt (3) penetrates through the through holes (19), the gasket (2), the limiting block (4) and the threaded holes (21) and is connected with the box body (7), and the upper cover (1), the box body (7), the clamp holder (5) and the limiting block (4) are made of insulating materials.
7. The static seal leakage detection device according to claim 1, characterized in that the contact area of the sealing strip is lengthened, and the four corners of the contact area are provided with anti-overload protrusions (20), when overload occurs, the anti-overload protrusions (20) are in surface contact with the box body (7) to avoid direct bearing of the sensor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910320484.0A CN110006596B (en) | 2019-04-20 | 2019-04-20 | Static seal leakage detection device |
| PCT/CN2019/101728 WO2020215540A1 (en) | 2019-04-20 | 2019-08-21 | Static seal leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910320484.0A CN110006596B (en) | 2019-04-20 | 2019-04-20 | Static seal leakage detection device |
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| CN110006596A CN110006596A (en) | 2019-07-12 |
| CN110006596B true CN110006596B (en) | 2021-04-06 |
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| CN201910320484.0A Active CN110006596B (en) | 2019-04-20 | 2019-04-20 | Static seal leakage detection device |
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| WO (1) | WO2020215540A1 (en) |
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|---|---|---|---|---|
| CN110006596B (en) * | 2019-04-20 | 2021-04-06 | 清华大学 | Static seal leakage detection device |
| CN110907098B (en) * | 2019-11-19 | 2021-07-09 | 长沙永昌车辆零部件有限公司 | Static water leakage experimental equipment and method for sealing strip |
| CN112065998B (en) * | 2020-09-10 | 2024-07-19 | 浙江工业大学 | Mechanical sealing structure for measuring leakage quantity |
| CN113218588B (en) * | 2021-04-01 | 2024-03-26 | 新兴铸管股份有限公司 | Alarm device for detecting leakage of pulverized coal bin |
| CN113390590B (en) * | 2021-05-26 | 2022-07-12 | 天能电池集团股份有限公司 | Device and method for detecting sealing performance of joint of storage battery groove body and groove cover |
| CN115420438A (en) * | 2022-08-05 | 2022-12-02 | 中广核工程有限公司 | Modularized static seal test detection device |
| CN116659758B (en) * | 2023-08-02 | 2023-10-10 | 烟台盈德精密机械有限公司 | Air-tightness test platform for air-driven urea nozzle |
| CN118005568B (en) * | 2023-12-22 | 2024-10-18 | 江苏神华药业有限公司 | Processing technique and device for preparing acipimox |
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| CN206244888U (en) * | 2016-11-17 | 2017-06-13 | 福建浩达智能科技有限公司 | One kind electrolysis leak-proof device and sealing ring |
| CN109425639A (en) * | 2017-08-28 | 2019-03-05 | 通用汽车环球科技运作有限责任公司 | For detecting method and apparatus existing for fluid |
| CN109100087A (en) * | 2018-09-29 | 2018-12-28 | 安徽中鼎密封件股份有限公司 | A kind of sealing performance test sensor, sealing ring tightness energy test device to be measured |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110006596A (en) | 2019-07-12 |
| WO2020215540A1 (en) | 2020-10-29 |
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