CN102606814A

CN102606814A - Novel reducing-preventive pipe fitting

Info

Publication number: CN102606814A
Application number: CN2012100512867A
Authority: CN
Inventors: 汪仕斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-01
Filing date: 2012-03-01
Publication date: 2012-07-25

Abstract

The invention discloses a novel reducing-preventive pipe fitting, which relates to a pipe fitting and comprises a hollow pipe fitting body with ends open. The inner wall of the pipe fitting body includes connecting sections in the middle, insertion sections close to ends and stacking sections between the connecting sections and the insertion sections, the diameter of each insertion section is matched with the outer diameter of a corresponding lining pipe of a bell-and-socket pipe, the diameter of each stacking section is matched with the inner diameter of the corresponding lining pipe of the bell-and-socket pipe, and the diameter of each connecting section is smaller than that of each stacking section. By the novel reduction-preventive pipe fitting, reducing and blockage of pipes can be prevented effectively, fusing strength and fusing tightness of connections are improved, and further, integral connection rigidity of the pipes is improved and the novel reducing-preventive pipe fitting is quite practical.

Description

Novel anti-undergauge pipe fitting

Technical field

The present invention relates to a kind of pipe fitting and be equipped with, relate in particular to a kind of novel anti-undergauge pipe fitting.

Background technique

The thermofusible spigot Placement is mainly adopted in the connection of the pipe-line system of metallic plastic-lining pipes such as water supply at present,, heating, air feed.Spill one section inner lining plastic tube after at first the outer layer metal of metallic plastic-lining composite pipe being peeled off, use special tool to carry out respectively carrying out the socket joint welding again behind the surface melting with inwall then with the plastic pipe of material.Become the lateral extrusion state along pipe fitting when tubing is connected with pipe fitting, form, produce the welding density of fused body along pipe fitting fusion face pressure radially; Thereby ensure certain heat seal strength and welding density, be referred to as the socket joint welding of interference usually, when the pipe fitting hot melt connects; Axial direction along pipe fitting must form the socket joint accumulation body, can cause pipe fitting undergauge even blocking pipe, produces potential safety hazard; Because metallic plastic-lining meets in the pipeline, and outer field metallic conduit is different with the linear expansion coeffcient of plastic lining pipeline, the linear expansion amount of plastics is bigger in addition; With the aluminum alloy is example, approximately is 7 times of aluminum alloy, thereby when causing expanding with heat and contract with cold in temperature variation; Two ends at the metallic plastic-lining multiple tube; Be pipeline and pipe fitting joint, the plastic lining pipeline has one section expansion elongation and exposes outside metallic conduit, and metallic conduit can't wrap up it fully, cover.Aspect the structural strength and compressive strength of whole tubing, the exposed plastic lining pipeline of elongation has formed the weak section of metallic plastic-lining multiple tube system, occurs water clock the most easily in this weakness section, even pipe explosion accident.Therefore caused rigidity, the compressive strength of metallic plastic-lining multiple tube system also to reduce to the level with plastic lining pipeline system; The overall structure rigidity and the compressive strength advantage of metal piping system will not exist, and become the systematic defect of metallic plastic-lining pipeline.

Summary of the invention

Problem to above-mentioned existing technology existence; The invention provides a kind of novel anti-undergauge pipe fitting, can effectively prevent undergauge and line clogging phenomenon, improved the fusion intensity and fusion sealing of connection part; And improved the integral rigidity that pipeline connects, very practical.

Technological scheme of the present invention is: a kind of novel anti-undergauge pipe fitting; Comprise hollow, open-ended main pipe body; Said main pipe body inwall comprises the linkage section at middle part, near the inserting section of end, and the accumulation section between linkage section and the inserting section, the external diameter coupling of the diameter of inserting section and corresponding bell-and-spigot pipe internal lining pipe; Pile up the internal diameter coupling of diameter with the corresponding bell-and-spigot pipe internal lining pipe of section, the diameter of linkage section is less than the diameter of piling up section.

As preferably, the horn mouth that increases gradually to outer diameter in the opening end of inserting section is served as reasons, the diameter of horn mouth largest portion is greater than the external diameter of corresponding bell-and-spigot pipe outer tube.

As preferably, the main pipe body outer wall has annular groove, is provided with stiffening rib in the annular groove.

As preferably, the material of said main pipe body is atactic copolymerized polypropene, polybutylene or heat-proof polythene.

As preferably, said main pipe body is straight-through tube, swan neck, three-way pipe or four-way pipe.

As preferably, said straight-through tube comprises equal coupling pipe, reducing coupling pipe, internal thread straight-through tube and outer silk straight-through tube.

As preferably, said swan neck comprises 90 degree elbows, one eighth bend, internal thread elbow and outer silk elbow.

As preferably, said three-way pipe comprises straight tee and reduced tee.

As preferably, said four-way pipe comprises straight cross pipe and reducing cross.

The invention has the beneficial effects as follows: the space that forms because of diameter difference between the accumulation section of main pipe body inwall of the present invention and the linkage section can hold the socket joint accumulation body that when fusion forms along the axial direction of pipe fitting; Be formed with the confined space that press seal closes; Avoid undergauge and blocking phenomenon, improved sealability.And because the void ratio of piling up between section and the linkage section is less, most of socket joint accumulation body is pressed fusion by envelope in this space, has improved the fusion intensity of connection part.The expansion extension that produces when the horn mouth of the opening end of inserting section is can be with the pipeline medium temperature variation big places in it, has avoided the plastic lining pipeline to expose outside metallic conduit, has improved integral rigidity and compressive strength that pipeline connects, and is very practical.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the invention 1 equal coupling pipe;

Fig. 2 is the plan view of the embodiment of the invention 1 equal coupling pipe;

Fig. 3 is the internal structure schematic representation of the embodiment of the invention 1 equal coupling pipe;

Fig. 4 is the sectional view of the embodiment of the invention 1 equal coupling pipe;

Fig. 5 is the structural representation of 90 degree elbows in the embodiment of the invention 2;

Fig. 6 is the plan view of 90 degree elbows in the embodiment of the invention 2;

Fig. 7 is the structural representation of the embodiment of the invention 3 straight tees;

Fig. 8 is the plan view of the embodiment of the invention 3 straight tees;

Fig. 9 is the structural representation of the embodiment of the invention 4 straight cross pipes;

Figure 10 is the plan view of the embodiment of the invention 4 straight cross pipes.

Embodiment

As one embodiment of the present invention, extremely shown in Figure 4 like Fig. 1, a kind of novel anti-undergauge pipe fitting; Comprise hollow, open-ended main pipe body 1; In the present embodiment, said main pipe body 1 is the equal coupling pipe, can certainly be other forms of straight-through tube; Such as reducing coupling pipe and wire connection straight-through tube etc., the wire connection straight-through tube comprises internal thread straight-through tube and outer silk straight-through tube.As preferably, the material of said main pipe body 1 is atactic copolymerized polypropene, polybutylene or heat-proof polythene.Said main pipe body 1 inwall comprises the linkage section 5 at middle part, near the inserting section 4 of end; And the accumulation section 6 between linkage section 5 and the inserting section 4; The diameter of inserting section 4 matees with the external diameter of corresponding bell-and-spigot pipe internal lining pipe, and during fusion, inserting section 4 is held metallic plastic-lining pipe lining pipe.Pile up the internal diameter coupling of diameter with the corresponding bell-and-spigot pipe internal lining pipe of section 6, the diameter of linkage section 5 is less than the diameter of piling up section 6.During fusion, pile up the space that forms because of diameter difference between section 6 and the linkage section 5 socket joint accumulation body along the axial direction formation of pipe fitting can hold fusion the time, be formed with the confined space that press seal closes, avoided undergauge and blocking phenomenon, improved sealability.And because the void ratio of piling up between section and the linkage section is less, most of socket joint accumulation body is pressed fusion by envelope in this space, has improved the fusion intensity of connection part.

In the present embodiment, as preferably, the horn mouth 7 that increases gradually to outer diameter in the opening end of inserting section 4 is served as reasons, the diameter of horn mouth 7 largest portions is greater than the external diameter of corresponding bell-and-spigot pipe outer tube.During fusion, the expansion extension that produces when horn mouth 7 is can be with the pipeline medium temperature variation big places in it, has avoided the plastic lining pipeline to expose outside metallic conduit, has improved integral rigidity and compressive strength that pipeline connects,

In the present embodiment, main pipe body 1 outer wall has annular groove 2, can economical with materials, be provided with stiffening rib 3 in the annular groove 2, and improved intensity of the present invention.

Embodiment 2:

Like Fig. 5 and shown in Figure 6, said main pipe body 1 is 90 degree elbows, can certainly be other forms of elbow, such as one eighth bend, internal thread elbow and outer silk elbow etc.All the other are identical with embodiment 1.

Embodiment 3:

Like Fig. 7 and shown in Figure 8, said main pipe body 1 is a straight tee, can certainly be reduced tee.All the other are identical with embodiment 1.

Embodiment 4:

Like Fig. 9 and shown in Figure 10, said main pipe body 1 is the straight cross pipe, can certainly be reducing cross.All the other are identical with embodiment 1.

The above is merely four kinds of preferred embodiments of invention, in order to restriction invention, any modification of being done within all spirit in invention and the principle, is equal to replacement and obvious mode of texturing etc., all should be included within the protection domain of invention.

Claims

1. novel anti-undergauge pipe fitting; Comprise hollow, open-ended main pipe body; It is characterized in that: said main pipe body inwall comprises the linkage section at middle part, near the inserting section of end, and the accumulation section between linkage section and the inserting section, the external diameter coupling of the diameter of inserting section and corresponding bell-and-spigot pipe internal lining pipe; Pile up the internal diameter coupling of diameter with the corresponding bell-and-spigot pipe internal lining pipe of section, the diameter of linkage section is less than the diameter of piling up section.

2. novel anti-undergauge pipe fitting according to claim 1, it is characterized in that: the horn mouth that increases gradually to outer diameter in the opening end of inserting section is served as reasons, the diameter of horn mouth largest portion is greater than the external diameter of corresponding bell-and-spigot pipe outer tube.

3. novel anti-undergauge pipe fitting according to claim 1 and 2, it is characterized in that: the main pipe body outer wall has annular groove, is provided with stiffening rib in the annular groove.

4. novel anti-undergauge pipe fitting according to claim 3, it is characterized in that: the material of said main pipe body is atactic copolymerized polypropene, polybutylene or heat-proof polythene.

5. novel anti-undergauge pipe fitting according to claim 4, it is characterized in that: said main pipe body is straight-through tube, swan neck, three-way pipe or four-way pipe.

6. novel anti-undergauge pipe fitting according to claim 5 is characterized in that: said straight-through tube comprises equal coupling pipe, reducing coupling pipe, internal thread straight-through tube and outer silk straight-through tube.

7. novel anti-undergauge pipe fitting according to claim 5 is characterized in that: said swan neck comprises 90 degree elbows, one eighth bend, internal thread elbow and outer silk elbow.

8. novel anti-undergauge pipe fitting according to claim 5, it is characterized in that: said three-way pipe comprises straight tee and reduced tee.

9. novel anti-undergauge pipe fitting according to claim 5, it is characterized in that: said four-way pipe comprises straight cross pipe and reducing cross.