CN115790987A - Pressure test plug for open end of conduit - Google Patents
Pressure test plug for open end of conduit Download PDFInfo
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- CN115790987A CN115790987A CN202310086979.8A CN202310086979A CN115790987A CN 115790987 A CN115790987 A CN 115790987A CN 202310086979 A CN202310086979 A CN 202310086979A CN 115790987 A CN115790987 A CN 115790987A
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- gland
- air chamber
- pressure head
- annular
- conduit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a pressure testing plug for an open end of a guide pipe, which comprises an air chamber, wherein a spring pressure head is arranged at the port of the air chamber, the spring pressure head protrudes out of the port of the air chamber, a locking nut is sleeved on the protruding part of the spring pressure head and is in threaded fit with the port of the air chamber, a rubber sealing block is arranged in the spring pressure head, a locking through hole is formed in the rubber sealing block, a first gland and a second gland are respectively arranged at two ends of the rubber sealing block, an annular clamping table is arranged at the port of the outer side of the spring pressure head, and the annular clamping table is abutted to the first gland; a piston is arranged in the air chamber in a sliding manner and comprises a shell, an annular protruding part is arranged on the outer side wall of the shell, a plurality of vent holes are formed in the side wall of the shell, and the outer side end of the shell is abutted to the second gland; this scheme structural design is ingenious, and the pipe dismouting is convenient, and the opening end that is applicable to the pipe is sealed fixed under the test of different pressure seal, and the pressure of test is big more, just is showing the sealed effect of pipe.
Description
Technical Field
The invention relates to the technical field of pressure testing of a conduit, in particular to a pressure testing plug for an open end of the conduit.
Background
The pipeline piece is mainly applied to hydraulic, fuel oil, lubricating oil, environment control and other systems of the airplane and is a life line of the airplane; the pressure sealing test of the conduit is an important detection process for detecting the sealing performance of a product in the production and manufacturing process of the conduit, and the pressure sealing test of the conduit is mainly divided into the following steps:
air pressure test: testing the sealing performance of the product under the gas condition with the pressure as the working pressure;
and (3) pressure resistance test: testing the capability of the test piece to bear the liquid medium with twice working pressure;
and (3) blasting test: and (4) checking whether the test piece can bear four times of the burst pressure of the working pressure liquid medium.
For the conduit with two molding ends, the pressure sealing test is to connect one end of the conduit with external pressure equipment in a threaded connection mode through an adapter, and to plug the other end of the conduit in a threaded connection mode through a plug; aiming at the catheter with one end being a forming end and the other end being an open end, the manufacturing conformity of the catheter is ensured; at present, the open end is extended (usually 50 mm), the extended tail end is formed by a process piece so as to facilitate the threaded connection between the open end of the conduit and the plug, the forming end of the conduit is connected with external pressure equipment, and the pressure sealing test is carried out on the conduit (the test mode is the same as the test mode of the conduit with the forming ends at both ends); after the pressure seal test is finished, the extended part of the open end is cut, the cut port needs to be subjected to flat end, and finally, the catheter needs to be measured, so that the catheter is ensured to be manufactured to meet the design requirement, and therefore, the mode has the following defects:
1. the material loss in the process of machining and manufacturing the guide pipes is increased, the open end of each guide pipe with one open end needs to be prolonged for testing, the cost of aviation materials is high, and the requirement of a single guide pipe is high, so that the method can cause the loss of a large amount of materials.
2. The catheter needs to prolong the allowance of the open end under the condition of design parameters; then, a process piece is adopted to form and process the extended end head, and a test is carried out after the processing; then, after the test is finished, the extended part needs to be cut and the end needs to be flattened; finally, the catheter is measured to ensure that the design requirements are met; thereby increasing the manufacturing process and the manufacturing cost of the catheter and reducing the production efficiency of the catheter.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pressure test plug for an open end of a conduit, which solves the problems of large material loss and complicated manufacturing process of the conduit with one open end in the prior art due to a pressure sealing test.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the end plug comprises an air chamber which is hollow inside and is provided with an opening at one end, a spring pressure head which is hollow inside and is provided with openings at two ends is arranged at the port of the air chamber, the spring pressure head protrudes out of the port of the air chamber, a locking nut which is used for extruding the spring pressure head and enabling the spring pressure head to contract is sleeved on the protruding portion of the spring pressure head, the locking nut is in threaded fit with the port of the air chamber, a rubber sealing block is arranged in the spring pressure head, a locking through hole which is used for penetrating through the opening end of the guide pipe is formed in the rubber sealing block, a first gland and a second gland are respectively arranged at two ends of the rubber sealing block, an annular clamping platform is arranged at the port of the outer side of the spring pressure head, and the annular clamping platform is abutted to the first gland; the air chamber slides and is provided with the piston, and the piston includes inside cavity and both ends open-ended casing, be provided with on the lateral wall of casing with air chamber inside wall sliding seal complex annular bulge, be located and be provided with a plurality of air vents on the lateral wall of the inboard casing of annular bulge, the outside end and the second gland looks butt of casing, the opening end of pipe run through first gland, locking through-hole and second gland and with the inside intercommunication of casing.
The beneficial effects of adopting the above technical scheme are: according to the scheme, the locking nut is screwed, the spring pressure head can be driven to contract and extrude the rubber sealing block, so that the rubber sealing block applies pretightening force to the guide pipe, the guide pipe is prevented from loosening, and meanwhile, the air chamber is sealed; afterwards, pressurize the pipe through external pressure equipment, the medium passes through the pipe, casing and air vent, finally flow to the air chamber in, and the medium that has pressure can produce thrust to annular bulge, make the piston slide and extrude second gland and rubber seal block to the open end of air chamber gradually, make the rubber seal block produce the axial contraction, and the rubber seal block of axial contraction can only be to its radial expansion, thereby increase the radial pressure of rubber seal block to the pipe, and then increase the frictional force between rubber seal block and the pipe, promote the sealed effect to the pipe.
Furthermore, the spring pressure head is fitted with a contraceptive ring and has a plurality of bar openings that are convenient for the spring pressure head shrink, and the lateral wall of spring pressure head bulge is the round platform form of opening shrink, and lock nut is the ring form, and lock nut's outside port department is provided with annular pressure platform, and annular pressure platform and the lateral wall looks butt of spring pressure head bulge.
The beneficial effects of adopting the above technical scheme are: the bar opening provides buffer space for spring pressure head's shrink, and at lock nut's in-process of screwing up gradually, the annular is pressed the platform and can be slided on spring pressure head's lateral wall, because the annular is pressed the radial dimension of platform and is fixed, leads to the annular to press the platform and can extrude spring pressure head's lateral wall to order about spring pressure head and shrink gradually.
Furthermore, an annular sinking platform is arranged at the port of the air chamber, and the inner side end of the spring pressure head is clamped on the annular sinking platform.
Furthermore, the two ends of the rubber sealing block are respectively provided with a first clamping groove, and the first gland and the second gland are respectively provided with a clamping head clamped with the first clamping grooves, so that the first gland, the second gland and the rubber sealing block are stable in structure and are not easy to radially deviate; the inboard of second gland is provided with the second draw-in groove, and the open end of casing is inserted and is established in the second draw-in groove, makes the difficult radial skew that takes place of second gland in the in-process of transmission pressure, is favorable to the second gland to transmit the pressure of casing to the rubber seal piece on evenly steadily.
Further, the inner side end of the shell is abutted to the bottom of the air chamber, so that the piston cannot slide in the air chamber before the pressure sealing test is carried out, and the outer side end of the shell is prevented from being separated from the second gland.
Furthermore, the open end of the conduit is in interference fit with the locking through hole, and the elasticity of the rubber sealing block is utilized, so that the conduit has a certain sealing effect on the outer wall of the conduit after penetrating through the locking through hole.
Further, a rubber ring for sliding seal is arranged on the contact surface of the annular protrusion part and the inner wall of the air chamber.
The invention has the beneficial effects that:
1. the scheme reduces the damage to the guide pipe in the pressure seal test process to the maximum extent through the extrusion seal form of the rubber seal block, and realizes the quick seal of the open end of the guide pipe, thereby reducing the material waste of the guide pipe and simplifying the production and manufacturing procedures of the guide pipe.
2. This scheme is applicable to the pressure seal test under the different pressure situations, and when testing pressure was bigger, then the piston promoted the stroke bigger, and the sealed piece of forcing rubber produces bigger deformation volume for form bigger frictional force between sealed piece of rubber and the pipe, thereby promote the sealed effect to the pipe, in order to improve the reliability of test.
3. According to the scheme, the locking outer sleeve is screwed to compress the spring chuck, so that the rubber sealing block is radially extruded to provide pretightening force for the guide pipe, the open end of the guide pipe is fixed, and the guide pipe is prevented from being rushed and separated in the medium pressurizing process.
Drawings
Fig. 1 is a schematic structural view of a pressure testing plug for an open end of a conduit.
Figure 2 is a cross-sectional view of a pressure testing plug at the open end of a conduit.
Fig. 3 is a schematic view of the flow of pressure medium from the pressure test plug at the open end of the conduit.
Fig. 4 is a schematic structural view of the piston.
Fig. 5 is a schematic diagram of the spring ram.
Fig. 6 is a schematic structural view of the lock nut.
The sealing device comprises an air chamber 1, a spring pressure head 2, a spring pressure head 3, a locking nut 4, a rubber sealing block 5, a locking through hole 6, a first pressing cover 7, a second pressing cover 8, an annular clamping table 9, a shell 10, an annular protruding portion 11, a vent hole 12, a strip-shaped opening 13, an annular pressing table 14, an annular sinking table 15, a first clamping groove 16, a clamping head 17, a second clamping groove 18, a rubber ring 19 and a guide pipe.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
As shown in fig. 1 to 4, the pressure test plug for the open end of the conduit of the scheme comprises an air chamber 1 with an inner hollow part and an opening at one end, a spring pressure head 2 with an inner hollow part and an opening at two ends is arranged at the port of the air chamber 1, an annular sinking platform 14 is arranged at the port of the air chamber 1, the inner side end of the spring pressure head 2 is clamped on the annular sinking platform 14, the spring pressure head 2 protrudes out of the port of the air chamber 1, and a locking nut 3 which is used for extruding the spring pressure head 2 and enabling the spring pressure head 2 to shrink is sleeved on the protruding part of the spring pressure head 2, and the locking nut 3 is in threaded fit with the port of the air chamber 1.
Be provided with rubber seal block 4 in the spring pressure head 2, be provided with on the rubber seal block 4 and be used for wearing to establish the locking through-hole 5 of 19 opening ends of pipe, the both ends of rubber seal block 4 are provided with first gland 6 and second gland 7 respectively, and the outside port department of spring pressure head 2 is provided with annular card platform 8, and annular card platform 8 and first gland 6 looks butt.
The piston is arranged in the air chamber 1 in a sliding mode, the piston comprises a hollow shell 9 with two open ends, an annular protruding portion 10 matched with the inner side wall of the air chamber 1 in a sliding and sealing mode is arranged on the outer side wall of the shell 9, a rubber ring 18 used for sliding and sealing is arranged on the contact surface of the annular protruding portion 10 and the inner wall of the air chamber 1, a plurality of vent holes 11 are formed in the side wall of the shell 9 located on the inner side of the annular protruding portion 10, the outer side end of the shell 9 is abutted to a second gland 7, the opening end of the guide pipe 19 penetrates through the first gland 6, the locking through hole 5 and the second gland 7 and is communicated with the inside of the shell 9, the opening end of the guide pipe 19 is in interference fit with the locking through hole 5, and the elasticity of the rubber sealing block 4 is utilized, and after the guide pipe 19 is arranged on the locking through hole 5 in a penetrating mode, and a certain sealing effect is achieved on the outer wall of the guide pipe 19.
The two ends of the rubber sealing block 4 are respectively provided with a first clamping groove 15, and the first gland 6 and the second gland 7 are respectively provided with a clamping head 16 clamped with the first clamping groove 15, so that the first gland 6, the second gland 7 and the rubber sealing block 4 are stable in structure and are not easy to radially deviate; the inboard of second gland 7 is provided with second draw-in groove 17, and the open end of casing 9 is inserted and is established in second draw-in groove 17, makes second gland 7 difficult radial skew of taking place at the in-process of transmission pressure, is favorable to second gland 7 evenly to transmit the pressure of casing 9 to rubber seal block 4 steadily.
The inside end of the housing 9 abuts the bottom of the air chamber 1, so that the piston does not slide in the air chamber 1 before the pressure seal test, and the outside end of the housing 9 is prevented from being separated from the second gland 7.
When the scheme is used for pressure seal test, the forming end of the guide pipe 19 is connected with external pressure equipment, the spring pressure head 2 is driven to contract by screwing the locking nut 3, and the contracted spring pressure head 2 can extrude the rubber seal block 4, so that the rubber seal block 4 applies pretightening force to the guide pipe 19, the locking through hole 5 is tightly matched with the guide pipe 19, and the air chamber 1 is sealed while the guide pipe 19 is prevented from loosening; then, the conduit 19 is stamped by external pressure equipment, a medium flows into the shell 9 through the conduit 19 and flows into the air chamber 1 through the vent hole 11, so that the pressure in the air chamber 1 is gradually increased, the medium with the pressure can generate thrust on the annular bulge 10, the piston gradually slides towards the opening end of the air chamber 1 and extrudes the second gland 7 and the rubber sealing block 4, the rubber sealing block 4 is axially contracted, the rubber sealing block 4 axially contracted can only radially expand, the radial pressure of the rubber sealing block 4 on the conduit 19 is increased, the friction force between the rubber sealing block 4 and the conduit 19 is increased, and the sealing effect on the conduit 19 is improved; the arrangement is such that the greater the test pressure is, the greater the axial compression amount of the rubber sealing block 4 is, the greater the radial pressure generated on the conduit 19 is, the more remarkable the sealing effect is, and finally, the sealing under different pressure tests on the open end of the conduit 19 is realized.
After the pressure sealing test is finished, the pressure in the air chamber 1 is relieved through external pressure equipment, and then the locking nut 3 is screwed out, so that the guide pipe 19 can be pulled out of the locking through hole 5, and the pressure sealing test is convenient and fast to disassemble.
Example 2
As shown in fig. 5 and fig. 6, this embodiment provides a concrete scheme of the spring pressure head 2 on the basis of embodiment 1, a plurality of strip-shaped openings 12 which are convenient for the spring pressure head 2 to contract are arranged on the spring pressure head 2 in a ring manner, the outer side wall of the protruding portion of the spring pressure head 2 is in a circular truncated cone shape with the contracted opening, the locking nut 3 is in a circular ring shape, an annular pressure table 13 is arranged at the end opening of the outer side of the locking nut 3, and the annular pressure table 13 is abutted against the outer side wall of the protruding portion of the spring pressure head 2.
In conclusion, the pressure test plug for the open end of the conduit has the advantages that the structure design is ingenious, the conduit 19 is convenient to disassemble and assemble, and the pressure test plug is suitable for sealing and fixing the open end of the conduit 19 under different pressure sealing tests, so that the material waste of the conduit 19 is reduced, and the production and manufacturing processes of the conduit 19 are simplified; meanwhile, the larger the pressure of the sealing test is, the more remarkable the sealing effect on the guide pipe 19 is, thereby effectively improving the reliability of the pressure sealing test.
Claims (7)
1. The utility model provides a pipe opening end pressure test end cap, its characterized in that, includes inside cavity and one end open-ended air chamber (1), the port department of air chamber (1) is provided with inside cavity and both ends open-ended spring pressure head (2), the port of spring pressure head (2) protrusion air chamber (1), and the bulge of spring pressure head (2) goes up the cover and is equipped with lock nut (3) that are used for extruding spring pressure head (2) and make spring pressure head (2) shrink, lock nut (3) and the port screw-thread fit of air chamber (1), be provided with rubber seal block (4) in spring pressure head (2), be provided with on rubber seal block (4) and be used for wearing to establish locking through-hole (5) of pipe (19) opening end, the both ends of rubber seal block (4) are provided with first gland (6) and second gland (7) respectively, the outside port department of spring pressure head (2) is provided with annular ka tai (8), annular ka tai (8) and first gland (6) looks butt;
slide in air chamber (1) and be provided with the piston, the piston includes inside cavity and both ends open-ended casing (9), be provided with on the lateral wall of casing (9) with air chamber (1) inside wall sliding seal complex annular bulge (10), be located annular bulge (10) inboard be provided with a plurality of air vents (11) on the lateral wall of casing (9), the outside end and the second gland (7) looks butt of casing (9), the opening end of pipe (19) runs through first gland (6), locking through-hole (5) and second gland (7) and communicates with the inside of casing (9).
2. The pressure test plug for the open end of the conduit according to claim 1, wherein a plurality of strip-shaped openings (12) facilitating contraction of the spring pressing head (2) are annularly distributed on the spring pressing head (2), the outer side wall of the protruding portion of the spring pressing head (2) is in a round table shape with the contracted opening, the locking nut (3) is in a circular ring shape, an annular pressing table (13) is arranged at the position of an outer side port of the locking nut (3), and the annular pressing table (13) is abutted to the outer side wall of the protruding portion of the spring pressing head (2).
3. The pressure testing plug for the open end of the conduit according to claim 1, wherein an annular sinking platform (14) is arranged at the port of the air chamber (1), and the inner end of the spring pressure head (2) is clamped on the annular sinking platform (14).
4. The pressure testing plug for the open end of the conduit according to claim 1, wherein the rubber sealing block (4) is provided with a first clamping groove (15) at each end, the first gland (6) and the second gland (7) are provided with clamping heads (16) clamped with the first clamping grooves (15), the inner side of the second gland (7) is provided with a second clamping groove (17), and the open end of the shell (9) is inserted into the second clamping groove (17).
5. The conduit open end pressure testing plug according to claim 1, wherein the inner end of the housing (9) abuts the bottom of the air chamber (1).
6. The conduit open end pressure testing plug according to claim 1, wherein the open end of the conduit (19) is in interference fit with the locking through hole (5).
7. The conduit open end pressure testing plug according to claim 1, wherein a rubber ring (18) for sliding sealing is provided on the contact surface of the annular protrusion (10) with the inner wall of the air chamber (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310086979.8A CN115790987B (en) | 2023-02-09 | 2023-02-09 | Pressure test plug for open end of conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310086979.8A CN115790987B (en) | 2023-02-09 | 2023-02-09 | Pressure test plug for open end of conduit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115790987A true CN115790987A (en) | 2023-03-14 |
| CN115790987B CN115790987B (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310086979.8A Active CN115790987B (en) | 2023-02-09 | 2023-02-09 | Pressure test plug for open end of conduit |
Country Status (1)
| Country | Link |
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| CN (1) | CN115790987B (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855275A (en) * | 1959-09-07 | 1960-11-30 | Flight Refueling Ltd | Improvements in or relating to plugs or closures |
| EP0225573A2 (en) * | 1985-12-02 | 1987-06-16 | Aluminum Company Of America | End sealing apparatus for hollow members |
| DE19648364A1 (en) * | 1996-11-22 | 1998-05-28 | Georg Maier | Sealing test stopper for monitoring tightness of pipe system carrying medium |
| CN102937506A (en) * | 2012-11-22 | 2013-02-20 | 浙江久立特材科技股份有限公司 | Inlet sealing device for steel pipe airtight tests |
| WO2013143703A1 (en) * | 2012-03-30 | 2013-10-03 | Helium Technology S.R.L. | Sealed coupling device |
| CN105135146A (en) * | 2015-10-13 | 2015-12-09 | 天津博益气动股份有限公司 | Pipe opening plugging device |
| CN108444808A (en) * | 2018-02-01 | 2018-08-24 | 东莞市联洲知识产权运营管理有限公司 | A kind of nozzle attachment device of automobile radiators pressure test |
| CN108827541A (en) * | 2018-03-13 | 2018-11-16 | 中冶南方（武汉）自动化有限公司 | Novel air tight detects seal plug |
| CN109211476A (en) * | 2017-06-30 | 2019-01-15 | 东风（十堰）汽车管业有限公司 | A kind of hose pipe end blocks the device of leak test |
| CN109458515A (en) * | 2018-12-07 | 2019-03-12 | 中车西安车辆有限公司 | A kind of airtight plugging device of sampling line and method |
| CN112145859A (en) * | 2020-10-20 | 2020-12-29 | 张家港中集圣达因低温装备有限公司 | Pressure test plug |
| CN112412387A (en) * | 2020-11-23 | 2021-02-26 | 中国矿业大学 | Reusable gas drilling two-plugging one-injection integrated hydraulic packer |
| CN213206944U (en) * | 2020-04-01 | 2021-05-14 | 福州振协管道有限公司 | A interior expanding end cap for pipeline leakproofness detects |
| CN214947320U (en) * | 2021-04-09 | 2021-11-30 | 山西建筑工程集团有限公司 | Plugging device for port for municipal pipeline construction |
| CN114165671A (en) * | 2021-10-18 | 2022-03-11 | 上海贤日测控科技有限公司 | Floating filling sealing mechanism |
| CN217081868U (en) * | 2021-12-31 | 2022-07-29 | 万耐特(珠海珠澳跨境工业区)温控设备有限公司 | Quick-mounting follow-up sealing plug for air tightness test |
-
2023
- 2023-02-09 CN CN202310086979.8A patent/CN115790987B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855275A (en) * | 1959-09-07 | 1960-11-30 | Flight Refueling Ltd | Improvements in or relating to plugs or closures |
| EP0225573A2 (en) * | 1985-12-02 | 1987-06-16 | Aluminum Company Of America | End sealing apparatus for hollow members |
| DE19648364A1 (en) * | 1996-11-22 | 1998-05-28 | Georg Maier | Sealing test stopper for monitoring tightness of pipe system carrying medium |
| WO2013143703A1 (en) * | 2012-03-30 | 2013-10-03 | Helium Technology S.R.L. | Sealed coupling device |
| CN102937506A (en) * | 2012-11-22 | 2013-02-20 | 浙江久立特材科技股份有限公司 | Inlet sealing device for steel pipe airtight tests |
| CN105135146A (en) * | 2015-10-13 | 2015-12-09 | 天津博益气动股份有限公司 | Pipe opening plugging device |
| CN109211476A (en) * | 2017-06-30 | 2019-01-15 | 东风（十堰）汽车管业有限公司 | A kind of hose pipe end blocks the device of leak test |
| CN108444808A (en) * | 2018-02-01 | 2018-08-24 | 东莞市联洲知识产权运营管理有限公司 | A kind of nozzle attachment device of automobile radiators pressure test |
| CN108827541A (en) * | 2018-03-13 | 2018-11-16 | 中冶南方（武汉）自动化有限公司 | Novel air tight detects seal plug |
| CN109458515A (en) * | 2018-12-07 | 2019-03-12 | 中车西安车辆有限公司 | A kind of airtight plugging device of sampling line and method |
| CN213206944U (en) * | 2020-04-01 | 2021-05-14 | 福州振协管道有限公司 | A interior expanding end cap for pipeline leakproofness detects |
| CN112145859A (en) * | 2020-10-20 | 2020-12-29 | 张家港中集圣达因低温装备有限公司 | Pressure test plug |
| CN112412387A (en) * | 2020-11-23 | 2021-02-26 | 中国矿业大学 | Reusable gas drilling two-plugging one-injection integrated hydraulic packer |
| CN214947320U (en) * | 2021-04-09 | 2021-11-30 | 山西建筑工程集团有限公司 | Plugging device for port for municipal pipeline construction |
| CN114165671A (en) * | 2021-10-18 | 2022-03-11 | 上海贤日测控科技有限公司 | Floating filling sealing mechanism |
| CN217081868U (en) * | 2021-12-31 | 2022-07-29 | 万耐特(珠海珠澳跨境工业区)温控设备有限公司 | Quick-mounting follow-up sealing plug for air tightness test |
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| Publication number | Publication date |
|---|---|
| CN115790987B (en) | 2023-06-16 |
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