Internal expansion jointed pipe fitting special for steel-plastic composite pressure pipe
A steel-plastic composite technology for connecting pipe fittings, applied in the direction of pipes/pipe joints/pipe fittings, pipe connection layout, mechanical equipment, etc. Reliability, increased pull-out resistance, convenient disassembly and assembly
Active Publication Date: 2007-07-25
XINXING DUCTILE IRON PIPES CO LTD
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Problems solved by technology
The existing problems are: (1) Since this kind of pipe fitting adopts the internal sealing method, the inner bushing that plays a supporting role is placed on the inner side of the pipe, so there is a phenomenon of reducing the diameter of this kind of pipe fitting at the joint of the pipeline
(2) Since the stainless steel sleeve is fastened on the outer plastic of the pipe by special tools, it is difficult to deform the steel pipe. Only the outer plastic of the pipe can resist pulling out, and the pressure bearing capacity is low, which may cause The joint is not tightly sealed and leaks water
[0006] The slot-type pipe fittings are nickel-plated copper pipe fittings, which have high pressure bearing capacity, strong anti-corrosion ability, and convenient construction, but the existing problems are: (1) the pipe fittings are expensive; (2) this kind of pipe fittings adopts the internal sealing method, A part of the pipe fitting body needs to be placed inside the pipe, so this kind of pipe fittings has serious diameter reduction problems at the joints of the pipeline.
[0007] The problems of grooved pipe fittings are: (1) This kind of pipe fittings requires special tools to roll groove the end of the pipe, and roll out a groove with a certain width and depth on the end of the pipe. Since the depth of this groove is only About 2mm, only the outer plastic deformation, the steel pipe is not deformed at all, so the pressure bearing capacity is low, and the anti-pull-off ability is weak; (2) When the groove is rolled, the inside of the pipe will have protrusions, which will cause some damage to the joints of the pipe. (3) This type of connection has weak resistance to pulling out, so it can only be used for buried installation, and cement piers are required at the corners of the pipeline, which brings inconvenience to the construction and increases the construction cost
[0008] The problems existing in the socket-type pipe fittings are: (1) This connection method is an external sealing method, and the end surface of the pipe is in contact with the medium. Therefore, in order to prevent the delamination of the pipe end of the steel-plastic composite pressure pipe, the end of the pipe must be cut when the pipe is sawed. Sealing treatment makes the construction more difficult; (2) This kind of pipe fittings basically does not have the ability to prevent slippage, and the technical requirements for pipe installation are relatively strict. After the pipe is installed, cement piers are required, which increases the difficulty and cost of construction; (3) The price of pipe fittings is relatively high. Expensive; (4) It is difficult to pull out the pipe by inserting the pipe into the pipe fitting, which makes the maintenance of the pipeline more difficult
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[0023] In the present invention, the internal expansion of the steel-plastic composite pressure pipe is carried out first, and then the connection of the pipeline is carried out, and the present invention does not cause the problem of reducing the diameter of the pipeline. The sealing method adopts the combination of pipe end seal and side seal.
[0024] This kind of pipe fittings Dn63 and below adopts nut type, and above Dn63 adopts flange type.
[0025] 1. Nut-type internal expansion pipe fittings are composed of threaded ring 4, snap ring 1, nut 2, left and right sealing rubber rings 3, etc. The connection method of this kind of pipe fittings is:
[0026] 1) Connection of equal-diameter straight-through pipe fittings: (1) put threaded ring 4 on the end of one pipe to be connected; put snap ring 1 on the end of another pipe to be connected; (2) put special The expansion tool is inserted into the inside of the pipe, and the inside of the pipe is expanded to the specified si...
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The present invention relates to a kind of connecting pipe fittings special-purpose for steel-plastic composite pressure pipe. It includes the following components: threaded ring, fastening ring and left and right sealing rubber rings. Said invention also provides the concrete structure of every above-mentioned component and its application method.
Description
(1) Technical field [0001] The invention relates to a special internal expansion connection pipe fitting for steel-plastic composite pressure pipes. (two), background technology [0002] The steel-plastic composite pressure pipe industry is an emerging industry that has just developed in recent years. It is favored by many manufacturers and users because of its high pressure bearing capacity, low price, good corrosion resistance, and small linear expansion coefficient. . However, judging from the current market situation and user feedback, the matching of pipe fittings for steel-plastic composite pressure pipes is not optimistic, and there are big problems in the matching of pipe fittings. [0003] At present, the special pipe fittings for steel-plastic composite pressure pipes appearing on the market mainly include the following types: (1) crimping inner sealing rigid pipe fittings (2) compression type pipe fittings; (3) card groove type pipe fittings; (4) groove type Fit...
Claims
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IPC IPC(8): F16L47/04
Inventor王黎晖宋亚峰陈芹英张红斌
OwnerXINXING DUCTILE IRON PIPES CO LTD