CN201561227U

CN201561227U - Plastic pipe fitting for mechanical connection

Info

Publication number: CN201561227U
Application number: CN2009202104283U
Authority: CN
Inventors: 朱利平; 吕飞虹; 潘江林
Original assignee: SHANGHAI SANSHAN SINOBEST SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: SHANGHAI SANSHAN SINOBEST SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2009-09-29
Filing date: 2009-09-29
Publication date: 2010-08-25
Anticipated expiration: 2019-09-29

Abstract

The utility model discloses a plastic pipe fitting for mechanical connection, which comprises a plastic connector and two plastic nuts, wherein a central through-hole is arranged in the axial center of the plastic connector, and two external threads are arranged on the outer circumference of the plastic connector; an insertion part is arranged on the axial outer side of each thread and used for being inserted into a plastic pipe, and a saw-toothed ring is arranged on the insert part; and each plastic nut has a straight section with an inside diameter substantially equal to the outside diameter of the plastic pipe and an internal thread section matched with the external thread on the plastic connector, and the inside diameter of the straight section is smaller than that of the internal thread section. The plastic pipe fitting for mechanical connection is formed by the plastic connector and the plastic nuts, which are made of high-strength plastics, omits the use of the sealing ring and the metal sleeve/metal retainer ring in the prior art, meets the requirement for synchronization of the service life of the plastic pipe fitting for mechanical connection and the 50-year service life of the plastic pipe, and has good reliability and convenience for repair.

Description

The mechanical connection plastic pipe

Technical field

The utility model is designed for heating and uses plastic duct system and feedwater systems such as plastic pipe pipeline, particularly mechanical connection plastic pipe with plastic duct system, domestic hot-water.

Background technique

Existing plastic pipe mechanical connection pipe fitting mainly contains " clamp-press type " and " FERRULETYPE " two kinds of linkage structures.The common feature of above-mentioned two kinds of linkage structures are metal connecting pieces with the external diameter of plastic tube connection part all less than the internal diameter that is connected plastic tube with it.Their existing problems are as follows:

The shortcoming of a, " clamp-press type " connection pipe fitting is to need special-purpose pressing tongs instrument; Metallic sheath can not be dismantled and recycle; The difficulty of repairing when plastic piping goes wrong is big; The big sealing intensity that influences of the difference of thermal expansion coefficients of metallic sheath and plastic tube; Working life can not be synchronous with the plastic tube life-span.

B, because of the internal diameter size error of plastic tube bigger, this class error is because the accumulation of the external diameter tolerance of tubing and wall thickness tolerance produces, so the shortcoming of " FERRULETYPE " connecting means is to compress the join strength that size is difficult for guaranteeing plastic tube by same connection, join strength does not reach requirement the phenomenon that plastic tube comes off and leaks can occur; The big sealing intensity that influences of the difference of thermal expansion coefficients of metal clasp and plastic tube, sealing intensity do not reach the phenomenon that the infiltration of plastic tube joint can appear in requirement; Working life equally can not be synchronous with the plastic tube life-span.

The model utility content

Technical problem to be solved in the utility model is at the mechanical connection manner unreliability of existing plastic tube, is difficult for reparation property and is shorter than the plastic tube problem in 50 years working life working life, and proposes a kind of mechanical connection plastic pipe.

Technical problem to be solved in the utility model can be achieved through the following technical solutions:

The mechanical connection plastic pipe, it is characterized in that comprise plastic fastening and two plastic nuts, the axial centre of described plastic fastening is provided with a central through bore, the outer ring surface of described plastic fastening is provided with two sections outside threads, and externally threaded external diameter is greater than the external diameter of plastic tube; Each section outside thread arranged outside vertically has the insertion part of inserting in the plastic tube, and described insertion part external diameter is greater than the internal diameter of plastic tube, and described insertion part is provided with at least that twice prevent the saw-tooth ring that plastic tube comes off and seals; Straight-through section of having that an internal diameter equates with the plastic tube external diameter basically of described each plastic nut and with plastic fastening on the internal thread segment of outside thread engagement, described straight-through section internal diameter is less than the internal diameter of described internal thread segment, and described straight-through section with internal thread segment between adopt conical surface transition to be connected.

Has certain interval between two sections outside threads are axial.

Owing to adopted technological scheme as above, the utility model is made up of plastic fastening and plastic nut, plastic fastening and plastic nut select for use the highstrenghtpiston to make, seal ring and metallic sheath/metal clasp that prior art adopts have been removed, guarantee the working life of mechanical connection plastic pipe and the synchronous requirement in 50 years working life of plastic tube, and had good reliability, easy reparation property.

Description of drawings

Further specify the utility model below in conjunction with the drawings and specific embodiments.

Fig. 1 is the utility model mechanical connection plastic pipe and plastic tube connection diagram.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 1, the mechanical connection plastic pipe comprises plastic fastening 100 and two plastic nuts 200, and plastic fastening 100 and two plastic nuts 200 select for use the highstrenghtpiston to make.

The axial centre of plastic fastening 100 is provided with a central through bore 110, so that the flow of liquid mistake in the plastic tube 300.The outer ring surface of plastic fastening 100 is provided with two sections outside threads 120,120a, leaves certain distance between two sections outside threads 120, the 120a, can guarantee that like this plastic nut 200 is screwed to the position.The external diameter of two sections outside threads 120,120a is greater than the external diameter of plastic tube 300; In each section outside thread 120,120a arranged outside vertically insertion part 130, the 130a that inserts in two plastic tubes 300 arranged, insertion part 130,130a are essentially a tapered sleeve structure, external diameter is greater than the internal diameter of plastic tube 300, and insertion part 130,130a are provided with saw-tooth ring 131, the 131a that twice prevent that plastic tube from coming off and sealing.

Each plastic nut 200 has straight-through section 210 and the internal thread segment 220 that an internal diameter equates with plastic tube 300 external diameters basically, the internal diameter of straight-through section 210 is less than the internal diameter of

internal thread segment

220, and 230 transition of the employing conical surface are connected between straight-through section 210 and the internal thread segment 220.

Using method of the present utility model is as follows: at first two plastic nuts 200 are enclosed within on two plastic tubes 300, use traditional tube expander then, utilize the stretching ductility of plastic tube 300 that plastic tube 300 connection part internal diameters are enlarged, insertion part 130,130a with plastic fastening 100 two ends is inserted into respectively in the plastic tube 300 again, at last two plastic nuts 200 are screwed into outside thread 120, the 120a of plastic fastening 100, two plastic tubes 300 can be coupled together after screwing.

Owing to the utility model is connected with plastic tube 300 is to utilize the stretching ductility of plastics to adopt the expansion pipe internal diameter to connect, technological means is to strengthen with the insertion part 130 of plastic tube 300 internal diameter connection parts, 130a outside dimension on the plastic fastening 100, and adopt to prevent that plastic tube from coming off and the saw-tooth ring 131 that seal blocks function and the sealing function that plastic tube 300 inwalls play the assurance connection reliability, utilize the extruding recovery of plastic tube 300 and the reliability that guarantees to seal.

The utility model can not only couple together plastic tube and plastic tube, plastic tube and valve or plastic tube and other pipeline facilities can also be coupled together.

More than show and described basic principle of the present utility model and major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. mechanical connection plastic pipe, it is characterized in that comprise plastic fastening and two plastic nuts, the axial centre of described plastic fastening is provided with a central through bore, the outer ring surface of described plastic fastening is provided with two sections outside threads, and externally threaded external diameter is greater than the external diameter of plastic tube; Each section outside thread arranged outside vertically has the insertion part of inserting in the plastic tube, and described insertion part is provided with at least that twice prevent the saw-tooth ring that plastic tube comes off and seals; Straight-through section of having that an internal diameter equates with the plastic tube external diameter basically of described each plastic nut and with plastic fastening on the internal thread segment of outside thread engagement, described straight-through section internal diameter is less than the internal diameter of described internal thread segment.

2. mechanical connection plastic pipe as claimed in claim 1 is characterized in that, described straight-through section with internal thread segment between adopt conical surface transition to be connected.

3. mechanical connection plastic pipe as claimed in claim 1 is characterized in that, described insertion part external diameter is greater than the internal diameter of plastic tube.

4. mechanical connection plastic pipe as claimed in claim 1 is characterized in that, has certain interval between two sections outside threads are axial.