CN2491683Y

CN2491683Y - Heat contracting tubing

Info

Publication number: CN2491683Y
Application number: CN 00246766
Authority: CN
Inventors: 张义刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-22
Filing date: 2000-08-22
Publication date: 2002-05-15
Anticipated expiration: 2010-08-22

Abstract

The utility model discloses a thermal contraction pipe which is formed by the injection of cross-linked and modified polyethylene employed as the raw materials, and the pipe is used for the connection of pipes with different materials such as plastic pipes with plastic pipes, plastic pipes with steel pipes, plastic pipes with cast-iron pipes, etc, and which is capable of maintaining pipes that are damaged, broken and leaking. The appearance of the pipe body 1 is that the middle portion is swollen. The thickness of both ends of pipe 1 is 0.6 to 0.8 times of that of to-be-connected plastic pipes 3, 4, the thickness of wall of the middle portion of the pipe 1 is 1.2 to 1.5 times of that of the both ends, and the length of the pipe 1 is 1.3 to 2.2 times of the diameter of the connected plastic pipes 3, 4. Inner wall of the pipe 1 is sprayed with a hot-melt rubber film 2. In using time, the pipe 1 is connected to a connecting position 6 of the to-be-connected plastic pipes 3, 4, special tools are employed to heat on the surface of the pipe 1, and then the pipe and the connecting pipe are stuck together. The plastic pipes 3, 4 are contracted as a combination after the heating towards the pipe 1, and then the two pipes are connected. The utility model can meet or even surpass the requirements of pressure-bearing and sealing standard of all sized plastic, and processes can even be implemented with out a field power supply.

Description

Thermally shrinking pipe

The utility model relates to the thermal contraction type pipe fitting that a kind of plastic tube connects usefulness.

In all gases, liquid all types of plastic pipe installation work progresss such as (industrial water, agricultural drainage and irrigation, petrochemical industry, plumbing), the connection of pipeline is very crucial.Therefore, pipe fitting also is an indispensable critical component in the work progress.Because the plastic tube of different cultivars, different size, all require to have certain seal and pressure bearing standard, if the pipe fitting of connecting line does not reach the desired seal and pressure bearing standard of pipeline, just be difficult to guarantee the seal and pressure bearing and the requirement of strength of pipeline, especially being connected of plastic tube and steel pipe, cast iron tube, reducer, all exist certain degree of difficulty.In addition, produce at plastic lined piping break, when damage and seepage, also be a great problem if repair when thinking of.

At present, the known technology that uses in plastic lined piping laying construction process has in the pipe fitting gluing intubate connect, in establish rubber sealing and connect.Because the underground plastic lined piping of burying underground is subjected to bury again the extruding (or other external force effect) of soil, it is low that plastic tube easily produces in pipe fitting and is offset, causes seepage, pressure is born in sealing.Other has a kind of is to adopt welding, described in Chinese patent 90103705, adopts welding to need use welding equipment, and joint intensity is low, bear that pressure is low, construction bothers, and expense is higher.Having a kind of again is hot fusion method for linking, and described in Chinese patent 97196602, this method is to carry out in a heater station, and construction is inconvenient, and expense is higher.

The purpose of invention of the present utility model is that a kind of energy of design guarantees be connected the novel thermally shrinking pipe that plastic lined piping reaches use seal and pressure bearing standard-required, because being connected of seal and pressure bearing standard-required when connecting pipe fitting that plastic lined piping uses and not reaching actual use and plastic tube and steel pipe, cast iron tube, reducer, plastic lined piping in use breaks, the repairing problem of damage, seepage to solve.

The utility model is achieved in that adopting cross-linking modified polyethylene is the thermally shrinking pipe that raw material is processed into through injection, and profile is the waist drum shape, also can be long tubular or two ends and is tapered long tubular, also can be processed into different shape as required.Pipe fitting two ends wall thickness is to be connected 0.6～0.8 times of plastic tube wall thickness, and pipe fitting middle part wall thickness is 1.2～1.5 times of two ends wall thickness, and the length of pipe fitting is to be connected 1.3～2.2 times of plastic tube caliber.The thermally shrinking pipe inwall scribbles the hot melt adhesive film of 0.1～0.4mm.During use, be connected plastic tube counterpart place with what thermally shrinking pipe was enclosed within wiped clean, heat equably repeatedly at upper edge, thermally shrinking pipe surface axial direction with special-purpose heating tool, heating-up temperature is 160 ℃～240 ℃ (optimum temperature is 170 ℃～200 ℃), when seamless until between pipe fitting and connected tube, pipe fitting and connected tube tightly adhere to each other, stop heating.The pipe fitting that is heated is cooling gradually after stopping heating, and the powerful contractile force of generation makes pipe fitting and plastic tube be shrunk to one, and two pipes are firmly connected.

The utility model can also be used to repair break, the pipeline of damage and seepage, also can be used for being connected and the connection of pipes such as the distortion of tubing jointing, overproof, reducing of plastic tube and steel pipe, plastic tube and cast iron tube.The flexibility of pipe fitting is good, can embrittlement; Good corrosion resistance can anti-most of acid, alkali and chemical product; Resistance to pressure is good, can be made into the different size requirement height (more than the 40kg), in (16～40kg), low pressure (16kg following) product, pressure-bearing and sealability can satisfy or surpass the desired pressure bearing and seal standard of plastic tube of different cultivars, all size; Temperature tolerance is good, the highest can be anti-110 ℃, minimum can be anti--70 ℃.

Use the utility model connecting line, site operation is simple, convenient and easy, and the job site has non-transformer all can construct.Available dedicated heating grilled gun when electricity is arranged can not heat with blowtorch or welding torch when having electricity.

The utility model low production cost only is 1/3～1/10 of a like product.

The utility model is described in further detail below in conjunction with the drawings and the specific embodiments:

Fig. 1 is a sectional view of the present utility model

Fig. 2 is of the present utility model and is connected the sectional view of pipeline

Fig. 3 is a processing process of the present utility model

The counterpart place 6 connected plastic tubes 3,4 of 1 thermally shrinking pipe, 2 hot melt adhesive films, 3 connected plastic tube 4 connected plastic tube 5 connected plastic tubes 3,4 and the junction of thermally shrinking pipe among the figure

Embodiment:

1, the processing of thermally shrinking pipe and with being connected of plastic lined piping

To be the waist drum shape with thermally shrinking pipe 1 sharp processing that cross-linking modified polyethylene is made raw material by processing process shown in Figure 3, as shown in Figure 1.Thermally shrinking pipe 1 two ends wall thickness is to be connected 0.6～0.8 times of plastic tube 3,4 wall thickness, and thermally shrinking pipe 1 middle part wall thickness is 1.2～1.5 times of two ends wall thickness, and the length of thermally shrinking pipe 1 is to be connected 1.3～2.2 times of plastic tube 3,4 calibers.Thermally shrinking pipe 1 inwall scribbles the hot melt adhesive film 2 of 0.1～0.4mm.Elder generation is with thermally shrinking pipe 1 and be connected plastic tube 3,4 counterpart places 5 wiped clean, again thermally shrinking pipe 1 is enclosed within 6 places, junction on the plastic tube 3,4 of being connected of wiped clean, heat equably repeatedly at thermally shrinking pipe 1 surperficial upper edge axial direction with special-purpose heating tool, heating-up temperature is 200 ℃, and thermally shrinking pipe 1 is subjected to thermal shrinkage.Until thermally shrinking pipe 1 and be connected 3,4 of plastic tubes seamless, when tightly adhering to each other, stop heating.The thermally shrinking pipe 1 that is heated is cooling and continuation contraction in this process gradually after stopping heating, until being shrunk to one with plastic tube 3,4, two plastic tubes is firmly connected, as shown in Figure 2.

Testing result: pressure-bearing test

Pressure medium (kg) time (hour) testing result

Water 22 150 ne-leakages

When 2, thermally shrinking pipe was used for being connected of plastic tube and steel pipe, plastic tube and cast iron tube, its processing and connecting means were with embodiment 1.

Claims

1, a kind of plastic tube connects the thermally shrinking pipe of usefulness, and it is characterized in that: the profile of pipe fitting (1) is the waist drum shape.

2, a kind of plastic tube according to claim 1 connects the thermally shrinking pipe of usefulness, it is characterized in that: pipe fitting (1) two ends wall thickness is to be connected plastic tube (3), (4) wall thickness 0.6～0.8 times, the middle part wall thickness of pipe fitting (1) is 1.2～1.5 times of two ends wall thickness, and the length of pipe fitting (1) is to be connected plastic tube (3), (4) caliber 1.3～2.2 times.

3, connect the thermally shrinking pipe of usefulness according to claim 1,2 described a kind of plastic tubes, it is characterized in that: the inwall of pipe fitting (1) scribbles the hot melt adhesive film (2) of 0.1～0.4mm.