CN103323189A - Ship pipeline negative pressure leakage detection cover - Google Patents

Ship pipeline negative pressure leakage detection cover Download PDF

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Publication number
CN103323189A
CN103323189A CN2013102232808A CN201310223280A CN103323189A CN 103323189 A CN103323189 A CN 103323189A CN 2013102232808 A CN2013102232808 A CN 2013102232808A CN 201310223280 A CN201310223280 A CN 201310223280A CN 103323189 A CN103323189 A CN 103323189A
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CN
China
Prior art keywords
negative pressure
pipeline
detection cover
leak detection
film
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Application number
CN2013102232808A
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Chinese (zh)
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CN103323189B (en
Inventor
吴云锋
刘波
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QINGDAO LABORATORY UNIT 91872 OF PLA
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QINGDAO LABORATORY UNIT 91872 OF PLA
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Priority to CN201310223280.8A priority Critical patent/CN103323189B/en
Publication of CN103323189A publication Critical patent/CN103323189A/en
Application granted granted Critical
Publication of CN103323189B publication Critical patent/CN103323189B/en
Expired - Fee Related legal-status Critical Current
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Abstract

Provided is a ship pipeline negative pressure leakage detection cover. The negative pressure leakage detection cover is of a rectangular bag structure, and comprises films, a framework clamping chain, mighty cement gum, vacuum sealing silicone grease, an elastic belt and a magnet. The negative pressure leakage detection cover coats a piece to be tested tightly. The framework clamping chain is used for sealing the thermoplastic polyurethane film, pressure-sensitive adhesives (the mighty cement gum) and the magnet are used for sealing the sealing surface of a pipeline externally, and the elastic belt coats the pipeline for sealing internally. When negative pressure leakage occurs in the piece to be detected, the detection cover contracts fast and is attached to the surface of the piece to be tested, and the leakage degree can be determined by reading the pressure difference of a digital negative pressure meter. The negative pressure leakage detection cover is an online testing device, can check and determine the leakage portions fast, is convenient and fast to install, convenient to use and obvious in indication, can detect leakage conveniently and fast, and is especially suitable for detection and maintenance of a ship cabin, a steam turbine, refrigeration equipment and an air pumping system.

Description

A kind of marine piping negative pressure leak detection cover
Technical field
The present invention relates to a kind of vacuum detecting utility appliance, particularly a kind of marine piping negative pressure leak detection cover of a kind of vacuum for equipment such as boats and ships (negative pressure) system.
Background technology
Along with the high development of modern science and technology, the vacuum tank, the system that use in industry, commerce, science and research institution are increasing.Because manufacturing process can not be flawless, seal point is thousands of, and along with wearing out of components and parts is loosening, unavoidably there is the possibility of leakage in packoff in the middle of using.In actual production and life, the part of every requirement sealing, it is impossible definitely " not leaking ", " not leaking " that we say at ordinary times or " without leaking " refer to that only actual leakage rate is very small, and people out or not do not affect certain request for utilization with the instrument detection, and people's regulation is " not leaking " less than the leakage of a certain order of magnitude.
Vacuum (negative pressure) system is heap cabin, steam turbine, refrigerating plant and extract system important component part, in case break down, generally can have a strong impact on the normal operation of ship power, refrigeration system.The main generator of boats and ships, the vacuum system of main frame is set up in the process in vacuum, the situation that vacuum can't be set up often occurs, usually all be because vacuum pump, flange, the hermetic unit of the equipment such as pipeline breakage occurs and causes leaking, owing to being that negative pressure is leaked, system equipment, pipeline external does not have obvious presentation, can't in time find, there is not at present special-purpose checkout facility on the boats and ships, can only be by the switch of valve, the methods such as replacement of redundant pipeline valve are searched pipeline section and the scope at leak source place, definite location is unusually difficult, sometimes have to come " covering " maintenance leakage point by the method for changing sealings all in the certain limit, cause servicing time long, accuracy is not high, wastes time and energy, and also can affect maneuverability in the navigation process.The common method that at present industrial circle detection vacuum system is leaked has: freon detection, helium Mass Spectrometer Method, candle detect, ultrasound examination.Research about the online leak detection of vacuum system mainly is in the following areas both at home and abroad: (1) ultrasound examination, ultrasonic technology detects vacuum system and leaks, have the characteristics such as simple, that accurate, cost is low that detect, but need to use supersonic reflectoscope along closely (in the 15cm) detection of the suspicious leakage position of unit under test, and ultrasound examination requires leak source must send the ultrasound wave of some strength, in case leak source does not meet the demands, perhaps the background ultrasonic hash is excessive, just can't measure leak source; (2) candle detects, and the candle method is the most original method, still using in some urgent or simple occasion, but there is potential safety hazard in the candle method.Thereby send out vacuum system for the master of boats and ships and study the strong vacuum leak hunting technology of a kind of applicability, have very important economic benefit.
Summary of the invention
The object of the invention is to, overcome the deficiencies in the prior art part, a kind of device for detection of the vacuum pipe leakage is provided, principle of the present invention is to utilize the thermoplastic polyurethane film tightly to coat unit under test, make it effectively isolated with atmosphere outside, thereby set up one by the space that coats cover inner surface and formed by the lateral body outside surface, in case hole appears leaking in measured body, then this space is by leaking hole and vacuum system UNICOM, change by the pressure that detects this space, know that namely the leakage situation appears in testee.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of marine piping negative pressure leak detection cover, described negative pressure leak detection cover specifically comprises digital vacuum table, film, splenial bone chain, powerful clay, elastic webbing, magnet for the rectangle bag shaped structure; Described film is the rectangle bag shaped structure, be divided into, lower two-layer, the negative pressure leak detection cover of described rectangle bag shaped structure is connected with seal for pipe joints with valve, flange is equipped with at described valve two ends, flange is connected with pipeline, bulge-structure is set around the described pipeline, described valve, flange and pipeline are coated in the film, wherein the double-layer films of negative pressure leak detection cover upper end seals fully, and be connected with digital vacuum table, described leak detection cover lower end is equipped with the splenial bone chain, utilizes the sealing of splenial bone chain, and two ends, the described leak detection cover left and right sides utilize its double-layer films to pass through elastic webbing, powerful clay, magnet and splenial bone chain and pipeline seal.
Further, the double-layer films of end and the sealing of pipeline are achieved in the following ways about described negative pressure leak detection cover, at first by elastic webbing pipeline is sealed at leak detection cover two ends, the inboard described leak detection cover left and right sides, the pipeline outside utilizes projection and the splenial bone chain fitted seal on the pipeline, then coat powerful clay around the pipeline that the splenial bone chain coats and carry out three sealings, utilize at last magnet to be adsorbed on mutually that the pipeline to film coated seals on the film.
Further, described film is the thermoplastic polyurethane film, and its toughness and intensity are high, is difficult for being punctured by metal burr and sharp shaped material; Adopt the corona treatment method to process to described film surface, improved the bounding force of adhesive and film.
Further, described powerful clay is pressure sensitive adhesive.
Further, described digital vacuum table passes through before the display screen read test and the pressure difference after the test, realizes online detection.
Compared with prior art, the present invention has following useful effect:
(1) propose to adopt soft clad type leak detection cover technology for detection pipeline vacuum leak, visual result has interim leak stopping effect simultaneously.
(2) the leak detection cover is by selecting suitable splenial bone chain, polyurethane diaphragm seal material, magnet and elastic webbing, so that tightness reaches designing requirement, diaphragm seal is cracky not, has solved sealing problem.
(3) three sealings of rectangle bag shaped structure negative pressure leak detection cover two ends, left and right sides employing of the present invention, the outside utilizes cooperating of pipeline and splenial bone chain, pipe ends is utilized magnet and the sealing of powerful clay, and the inboard utilizes the sealing function of elastic webbing and magnet, has increased sealing.
Description of drawings
Fig. 1 is the structural representation of negative pressure leak detection cover of the present invention;
1. digital vacuum table, 2. conduit, 3. thermoplastic polyurethane film (TPU), 4. valve, 5. powerful clay, 6. splenial bone chain, 8. elastic webbing, 9. magnet
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
A kind of marine piping negative pressure leak detection cover, structure is the rectangle bag shaped structure.As shown in Figure 1, the leak detection cover of rectangle bag shaped structure is mainly used in the detection of valve type, flange, vibroshock class and round pie flange, can determine the size of the leak detection cover of rectangle bag shaped structure by the size of measuring part on the boats and ships.
Rectangle bag shaped structure leak detection cover comprises digital vacuum table 1, thermoplastic polyurethane film (TPU) 3, powerful clay 5, splenial bone chain 6, elastic webbing 8, magnet 9, as shown in Figure 1, the thermoplastic polyurethane film 3 of rectangle bag shaped structure leak detection cover is divided into two-layer, the upper end of the leak detection cover double-layer films 3 of rectangle bag shaped structure seals fully, the lower end is installed splenial bone chain 6 and is sealed, the structure of splenial bone chain 6 is that projection and spill are staggered, wherein the projection of splenial bone chain 6 cooperates the realization sealing with another spill, rectangle bag shaped structure negative pressure leak detection cover two ends, left and right sides upside 3/4ths length seal fully, all the other 1/4th length are installed splenial bone chain 6 structures, utilize 6 sealings of splenial bone chain.Design bulge-structure around the pipeline on flange, the projection of splenial bone chain 6 and pipeline cooperates assembling, and all the other utilize bilevel splenial bone chain 6 to seal.3/4ths length seal fully in inside, two ends, the rectangle bag shaped structure left and right sides, inside at outer membrane 3 increases thin film 3, utilize elastic webbing 8 to pass inboard film 3 at 3/4ths length places, make round and elastic band 8, the two ends remainder is installed splenial bone chain 6.
When the flange that pipeline is installed is detected, open the splenial bone chain 6 of lower end, make the up and down two separate of film 3, open simultaneously the splenial bone chain 6 at two ends, the left and right sides, pipeline and flange are coated in the film 3, the upper end of pipeline is near the upper end of film 3 openings, pipeline is respectively by the circular elastic webbing 8 in two ends, the left and right sides, utilize the elastic reaction of elastic webbing 8 that pipeline is sealed, utilize projection and splenial bone chain 6 fitted seal on the pipeline in two ends, left and right sides outermost, the pipeline that again splenial bone chain 6 is coated is coated powerful clay 5 all around and is carried out three sealings, all the other utilize the splenial bone chain 6 on the double-layer films 3 to seal, and utilize the mutual absorption of magnet 9 that the pipeline that film 3 coats is sealed at the two ends of film 3 and elastic webbing 8 coating pipelines.Rectangle bag shaped structure negative pressure leak detection cover upper end fully sealing and and be connected vacuum table 1 connection, utilize the tight units under test such as valve such as vacuum system, flange that coat of rectangle bag shaped structure negative pressure leak detection cover, thereby set up the space that forms by coating cover inner surface and measured body outside surface, in case hole appears leaking in measured body, then this space is by leaking hole and vacuum system UNICOM, change by the pressure that detects this space, know that namely the degree of leaking appears in measured body.
Copy the vacuum pipe simulation on the boats and ships to set up an empirical model, utilize the present invention that measured piece is detected, experiment coating speed is 3.5 minutes, and when the negative pressure leakage appearred in device, the leak detection cover can shrink rapidly, is close to the unit under test surface, and the result is obvious.Experimental result is analyzed: (1) leak detection cover seal leakage amount is less than 6sccm/m, and the covered effect of this data declaration film is fine; (2) contrasted multiple leak detection cover material, found that toughness and the tensile strength of thermoplastic polyurethane film is better, reliability is higher, is difficult for being punctured by sharp things such as metal burrs; (3) can people's complete operation, operation easier is low, and the deadline is short, and the result easily judges; (4) result indicates obviously, because leak detection cover sealing is very good, in case valve member leaks, the leak detection cover obviously is close to the surface of measured piece.
The present invention is a kind of Portable negative pressure pick-up unit, read the pressure difference of closed system by the coating that utilizes the thermoplastic polyurethane film, thereby determine whether to leak and leakiness, be specially adapted to pile detection and the maintenance of cabin, steam turbine, refrigeration dress and extract system, have good effect.

Claims (5)

1. a marine piping negative pressure leak detection is covered, described negative pressure leak detection cover specifically comprises digital vacuum table (1), film (3), splenial bone chain (6), powerful clay (5), elastic webbing (8), magnet (9) for the rectangle bag shaped structure; It is characterized in that, described film (3) is the rectangle bag shaped structure, be divided into, lower two-layer, the negative pressure leak detection cover of described rectangle bag shaped structure is connected with seal for pipe joints with valve (4), flange is equipped with at described valve (4) two ends, flange is connected with pipeline, bulge-structure is set around the described pipeline, described valve, flange and pipeline are coated in the film, wherein the double-layer films (3) of negative pressure leak detection cover upper end seals fully, and be connected with digital vacuum table (1), described leak detection cover lower end is equipped with splenial bone chain (6), utilize the sealing of splenial bone chain, two ends, the described leak detection cover left and right sides utilize its double-layer films (3) by elastic webbing (8), powerful clay (5), magnet (9) and splenial bone chain (6) seal with pipeline.
2. marine piping negative pressure leak detection according to claim 1 is covered, it is characterized in that, the double-layer films (3) at described negative pressure leak detection cover two ends, the left and right sides is achieved in the following ways with the sealing of pipeline, at first by elastic webbing (8) pipeline is sealed at leak detection cover two ends, the inboard described leak detection cover left and right sides, the pipeline outside utilizes projection and splenial bone chain (6) fitted seal on the pipeline, then coat powerful clay (5) around the pipeline that splenial bone chain (6) coats and carry out three sealings, utilize at last magnet (9) mutually to be adsorbed on the pipeline that on the film film (3) is coated and seal.
3. marine piping negative pressure leak detection cover according to claim 1 and 2 is characterized in that, described film (3) is the thermoplastic polyurethane film, and described film (3) surface adopts the corona treatment method to process.
4. marine piping negative pressure leak detection cover according to claim 1 and 2 is characterized in that, described powerful clay (5) is pressure sensitive adhesive.
5. marine piping negative pressure leak detection cover according to claim 1 and 2 is characterized in that, described digital vacuum table (1) passes through before the display screen read test and the pressure difference after the test, realizes online detection.
CN201310223280.8A 2013-06-07 2013-06-07 A kind of ship pipeline negative pressure leakage detection cover Expired - Fee Related CN103323189B (en)

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CN103323189B CN103323189B (en) 2016-01-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104913193A (en) * 2015-06-30 2015-09-16 宜昌江峡船用机械有限责任公司 Leakage detection method and device for inner container of interlayer low-temperature container
CN108168800A (en) * 2017-12-25 2018-06-15 沪东中华造船(集团)有限公司 A kind of method for butterfly valve being replaced to carry out pipeline tightness test using polyethylene tube
CN110702328A (en) * 2019-10-21 2020-01-17 中船澄西船舶修造有限公司 Sealing device for detecting vacuum state of ship tail shaft seal

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CN203309526U (en) * 2013-06-07 2013-11-27 中国人民解放军91872部队青岛研究室 Ship pipeline negative pressure leakage detection casing

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104913193A (en) * 2015-06-30 2015-09-16 宜昌江峡船用机械有限责任公司 Leakage detection method and device for inner container of interlayer low-temperature container
CN108168800A (en) * 2017-12-25 2018-06-15 沪东中华造船(集团)有限公司 A kind of method for butterfly valve being replaced to carry out pipeline tightness test using polyethylene tube
CN110702328A (en) * 2019-10-21 2020-01-17 中船澄西船舶修造有限公司 Sealing device for detecting vacuum state of ship tail shaft seal
CN110702328B (en) * 2019-10-21 2021-06-18 中船澄西船舶修造有限公司 Vacuum state detector in ship tail shaft sealing cavity

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