CN101476658B - Socket pipe connector - Google Patents
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- CN101476658B CN101476658B CN2009100767440A CN200910076744A CN101476658B CN 101476658 B CN101476658 B CN 101476658B CN 2009100767440 A CN2009100767440 A CN 2009100767440A CN 200910076744 A CN200910076744 A CN 200910076744A CN 101476658 B CN101476658 B CN 101476658B
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Abstract
The invention relates to a splicing piece of a socket pipe, which comprises a pipe body and a splicing section connected with the pipe body. The splicing piece of the socket pipe also comprises an accumulation fusing section, a retractable compensating section and measurement identifications, wherein the accumulation fusing section is connected with the splicing section; the inner diameter of the accumulation fusing section gradually increases from a connecting position of the splicing section to the retractable compensating section, and is used for fusing a splicing accumulation body in a space formed between the accumulation fusing section, a plastic lined pipeline in a metal plastic-lined pipeline to be connected and an end wall of an outer lining metal pipeline; the retractable compensating section is connected with the accumulation fusing section and the inner diameter of the retractable compensating section is larger than that of the splicing section; and the measurement identifications are arranged on outer surfaces of the splicing section and the accumulation fusing section. The splicing piece of the socket pipe utilizes the splicing accumulation body to carry out secondary sealing on the outer surfaces of the accumulation fusing section and the plastic lined pipeline so as to improve fusion strength and fusion sealing property of the connecting position, and makes an expansion stretched section generated when medium temperature of the pipeline has large variation arranged in the retractable compensating section so as to improve the whole rigidity of the metal plastic-lined pipeline.
Description
Technical field
The present invention relates to a kind ofly to be used to feed water, the pipe joint of system such as air feed, chemical industry, heating power, the socket pipe connecting part of particularly a kind of plastic pipe or metallic plastic-lining pipeline.
Background technique
At present, the socket joint Placement of plastic pipe or metallic plastic-lining pipeline is mainly adopted in the connection of water supply, hot duct system.Wherein socket joint connects and comprises that thermofusible spigot connects and be connected with the electric capacity socket joint, generally adopts the inwall use special tool of the outer wall of the plastic pipe that thermoplastic material (as polyethylene, heat-proof polythene, polypropylene, polybutylene etc.) makes and plastic tube fitting to carry out the Placement of a kind of socket joint welding of carrying out behind the surface melting respectively.When being connected with pipe connector socket joint hot melt or electric capacity, tubing becomes the lateral extrusion state along pipeline, formation is along pipeline fusion face pressure radially, produce the welding density of fusion, thereby ensure certain heat seal strength and welding density, be referred to as the socket joint welding of interference usually.
When plastic pipe connects, be port alignment,, carry out the connection of socket joint hot melt after the insertion and get final product according to the insertion depth of national Specification with pipeline and pipe connector.The Placement of metallic plastic-lining pipeline is basic identical with plastic pipe, spills one section plastic lining pipeline after at first the outer layer metal of metallic plastic-lining multiple tube being peeled off, and the plastic lining pipeline that then this section is exposed carries out thermofusible spigot with plastic pipe and is connected.
From as can be known above-mentioned, there is following problem points in present pipe fitting when being connected with pipe connector:
1, plastic pipe or metallic plastic-lining pipeline are when thermofusible spigot or the connection of electric capacity socket joint, axial direction along pipeline must form the socket joint accumulation body, in the world described socket joint accumulation body is not done the consideration of any application facet before this, inevitable outcome after only being used as socket joint and connecting is treated and is not used, certainly in socket joint hot melt or electric capacity attended operation process these socket joint accumulation bodies sometimes to the effect of damaging property of pipe-line system.Random error aspect from the attended operation of socket joint hot melt: (1) hot molten time is long or inserting depth is excessive, and the socket joint accumulation body in pipe connector inside along the socket joint direction can cause pipeline undergauge even blocking pipe, buries the major accident hidden danger of pipeline operation; (2), the operation lack of standardization, off-axis causes the face of weld discontinuity to insertion during as thermofusible spigot, or welding socket joint excessive velocities, slow excessively, cause face of weld to fail thoroughly to fuse, produce the plane of weakness of heat seal strength, in the long-time running process, bury accident potential such as seepage, booster.Systematic error aspect from the attended operation of socket joint hot melt: (1), can destroy greatly the aesthetic property that pipe-line system connects along the socket joint accumulation body that socket joint oppositely forms the joint pipeline outer wall at the pipe connector port; (2), the out of roundness of pipe part causes thermofusible spigot interference face unbalance stress, the face of weld heat seal strength is inhomogeneous, even produces the gap, causes seepage.
2, the Placement of metallic plastic-lining pipeline is under the little situation of pipeline medium temperature variation, and is stable, is not prone to the phenomenon of dripping, leak, run, emitting.If but the medium temperature amplitude of variation will go wrong when bigger, even causes Accident due to quality to take place.Its basic reason is in the metallic plastic-lining multiple tube that outer field metallic conduit is different with the linear expansion coeffcient of plastic lining pipeline, and the linear expansion amount of plastics is bigger, is example with the aluminum alloy, 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, at the easiest water clock that occurs of this weakness section, even pipe explosion accident.Therefore caused metallic plastic-lining multiple tube system rigidity, compressive strength to reduce to 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 yet.
3, plastic pipe or metallic plastic-lining pipeline are when connecting, its welding degree of depth is utilized the regulation of gauge according to NBS by the staff basically, after indicating the welding degree of depth, the outer surface of pipeline carries out in advance that socket joint connects, pipeline and pipe connector itself do not have the function of measurement, therefore, shortcomings such as existing pipe connector has the socket joint complex procedures, and efficiency of construction is low, and operate miss is big.
Summary of the invention
Purpose of the present invention just is to provide a kind of socket pipe connecting part, to address the above problem.
For achieving the above object, technological scheme of the present invention is to adopt a kind of socket pipe connecting part, comprises body and the inserting section that is attached thereto, and also comprises:
Pile up the welding section, link to each other with described inserting section, external diameter is identical with the external diameter of described inserting section, internal diameter from the joint of described inserting section, direction towards the flexible compensation section increases gradually, in the space that is used for the fusion of grafting accumulation body is formed between the end wall of described accumulation welding section, the ducted plastic lining pipeline of metallic plastic-lining to be connected and outer lining metallic conduit;
The flexible compensation section links to each other with described accumulation welding section, and internal diameter is greater than the internal diameter of inserting section;
The tolerance sign is located at described inserting section and piles up the outer surface of welding section, and length is described inserting section and the length sum of piling up the welding section.
Wherein, described accumulation welding section forms minimum diameter and maximum inner diameter, described minimum diameter is formed on the joint with inserting section, described maximum inner diameter is formed on the joint with the flexible compensation section, and the difference of described maximum inner diameter and minimum diameter equals the thickness of the ducted outer lining metallic conduit of metallic plastic-lining to be connected.
Wherein, the spatial volume that forms between the end wall of described accumulation welding section, the ducted plastic lining pipeline of metallic plastic-lining to be connected and outer lining metallic conduit is less than or equal to the volume of grafting accumulation body.
Wherein, the internal surface of described flexible compensation section is provided with flexible compensation section groove, or the internal surface of described flexible compensation section is a rough surface.
Wherein, the internal surface of described body is provided with the body groove.
Wherein, described tolerance sign is along the axial direction setting of described inserting section, and initial position is in the joint of described body and described inserting section.
Wherein, described tolerance sign and described inserting section and to pile up the welding section one-body molded, described tolerance are designated with respect to inserting section and pile up outstanding convex parts of the outer surface of welding section or sagging shallow slot.
Wherein, described tolerance is designated paster, or is the marker by spraying, be coated with, carve, write, drawing.
Wherein, the surface of described paster is printed on graduation line, or described paster is an arrowhead form.
Wherein, the outer surface in each described inserting section of same body is provided with one or two described tolerance sign.
Wherein, described socket pipe connecting part is thermofusible spigot pipe connector or electric smelting socket pipe connecting part.
Advantage of the present invention and beneficial effect are, socket pipe connecting part of the present invention, by grafting accumulation body and the internal surface of piling up the welding section, fusion between the ducted plastic lining pipeline of the metallic plastic-lining to be connected outer surface, connection part is carried out secondary seal, the fusion intensity and the fusion sealing of connection part have been improved, and the expansion extension that utilizes the flexible compensation section that the pipeline medium temperature variation is produced when big places in it, improved the integral rigidity that pipeline connects, simultaneously by being located at the tolerance sign of inserting section and accumulation welding section surface, reduce measurement error, and improved efficiency of construction.
Description of drawings
Fig. 1 is the structural representation of socket pipe connecting part of the present invention;
Fig. 2 is the connection diagram of socket pipe connecting part of the present invention and metallic plastic-lining pipeline to be connected;
Fig. 3 is the structure enlarged diagram of A part among Fig. 2 of the present invention;
Fig. 4 is the enlarged diagram of the another kind of structure of A part among Fig. 2 of the present invention.
Among the figure: 10, body; 11, body groove; 20, inserting section; 30, pile up the welding section; 40, flexible compensation section; 41, flexible compensation section groove; 50, tolerance sign; 60, end wall; 61, outer lining metallic conduit; 62, plastic lining pipeline.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, socket pipe connecting part of the present invention, the inserting section 20 (the bc section among Fig. 1) that comprises body 10 (the ab section among Fig. 1) and be attached thereto, the other end of inserting section 20 connects successively piles up welding section 30 and flexible compensation section 40.The welding degree of depth of the compound national Specification of length of inserting section 20.
The external diameter of piling up welding section 30 is identical with the external diameter of inserting section 20, internal diameter begins to increase gradually from the joint with inserting section 20, form the minimum diameter of piling up welding section 30 in joint with inserting section 20, form the maximum inner diameter of piling up welding section 30 in the joint with flexible compensation section 40, the difference of maximum inner diameter and minimum diameter equals the pipe thickness of the ducted outer lining metallic conduit 61 of metallic plastic-lining to be connected.
The concrete computational methods of the length of flexible compensation section 40 are as follows:
With aluminum alloy plastics lined pipe road is example, when maximum uses the temperature difference to be 80 ℃, the maximum free linear expansion amount of aluminum alloy plastics lined pipe road under the normal mounting condition according to different size, getting plastic lining pipe line expansion coefficient is the swell increment calculating parameter, calculate aluminum alloy lining plastic composited pipe road pairing pipe fitting flexible compensation section 40 length of each specification, in the foundation relevant national standard, for example, the plastic lining pipeline is the metallic plastic-lining pipeline of polypropylene material, according to the GB/T18742.3-2002 NBS, when the plastic lining pipeline is other class plastics, hot melt connects the degree of depth then according to its corresponding national standards, on the thermofusible spigot formula pipe fitting basis of regulation, it is as follows to design the special pipe fitting data:
Be of a size of example with the dn20 pipe fitting, be calculated as follows:
1, the linear expansion amount of liner PP-R plastic tube
ΔL1＝ΔT×L×α1
In the formula: Δ L1-PP-R moulds pipeline swell increment (mm)
The maximum temperature difference of water in the Δ T-pipeline (℃)=90-10=80
L-pipeline rigid support maximum spacing (m), dn20 pipeline L=1.2
α 1-PP-R moulds pipeline expansion coefficient (mm/mk)=0.15
: Δ L1=80 * 1.2 * 0.15=14.4 (mm)
2, outer compound Al-alloy pipe linear expansion amount
ΔL2＝ΔT×L×α2
In the formula: Δ L2-Al-alloy pipe linear expansion amount (mm)
L-pipeline rigid support maximum spacing (m), dn20 pipeline L=1.2
α 2-Al-alloy pipe coefficient of linear expansion (mm/mk)=0.025
: Δ L2=80 * 1.2 * 0.025=2.4 (mm)
3, PP-R moulds the relative Al-alloy pipe linear expansion amount of pipe
ΔL3＝ΔL1-ΔL2
In the formula: Δ L3-PP-R moulds pipe relative Al-alloy pipe linear expansion amount (mm)
Δ L1-PP-R moulds pipeline swell increment (mm)
Δ L2-Al-alloy pipe linear expansion amount (mm)
: Δ L3=14.4-2.4=12 (mm)
4, pipe connector flexible compensation segment length
L3＝ΔL3/2+c
In the formula: L3-pipe connector flexible compensation segment length
Δ L3-PP-R moulds pipe relative Al-alloy pipe linear expansion amount (mm)
C-installs surplus (mm), gets c=1
: L3=12/2+1=7 (mm)
The pipe connector flexible compensation segment length that draws all size of dn20～160 with same computational methods sees the following form 1:
Table 1: the pipe connector flexible compensation segment length of all size
| Sequence number | Nominal outside diameter dn | Pipeline maximum flexibility support interval L | Mould pipeline swell increment Δ L1 | Al-alloy pipe linear expansion amount Δ L2 | Mould the relative Al-alloy pipe linear expansion amount Δ L3 of pipe | Pipe connector flexible compensation segment length L3 | Flexible compensation section bellmouth mean inside diameter D3 |
| 1 | 20 | 1200 | 14.4 | 2.4 | 12.0 | 7.0 | 21.3 |
| 2 | 25 | 1400 | 16.8 | 2.8 | 14.0 | 8.0 | 26.3 |
| 3 | 32 | 1600 | 19.2 | 3.2 | 16.0 | 9.0 | 33.3 |
| 4 | 40 | 1800 | 21.6 | 3.6 | 18.0 | 10.0 | 41.5 |
| 5 | 50 | 2000 | 24.0 | 4.0 | 20.0 | 11.0 | 51.5 |
| Sequence number | Nominal outside diameter dn | Pipeline maximum flexibility support interval L | Mould pipeline swell increment Δ L1 | Al-alloy pipe linear expansion amount Δ L2 | Mould the relative Al-alloy pipe linear expansion amount Δ L3 of pipe | Pipe connector flexible compensation segment length L3 | Flexible compensation section bellmouth mean inside diameter D3 |
| 6 | 63 | 2200 | 26.4 | 4.4 | 22.0 | 12.0 | 64.8 |
| 7 | 75 | 2400 | 28.8 | 4.8 | 24.0 | 13.0 | 77.0 |
| 8 | 90 | 2600 | 31.2 | 5.2 | 26.0 | 14.0 | 92.4 |
| 9 | 110 | 2800 | 33.6 | 5.6 | 28.0 | 15.0 | 112.8 |
| 10 | 125 | 2800 | 33.6 | 5.6 | 28.0 | 15.0 | 128.3 |
| 11 | 160 | 3000 | 36.0 | 6.0 | 30.0 | 16.0 | 164.0 |
Tolerance sign 50 is located at inserting section 20 and piles up the outer surface of welding section 30, length is inserting section 20 and the length sum of piling up welding section 30, initial position is in the joint of body 10 and inserting section 20, final position is in the joint of piling up welding section 30 and flexible compensation section, also can be located at inserting section 20, pile up the outer surface of welding section 30 and flexible compensation section 40, length is described inserting section 20, the length sum of piling up welding section 30 and flexible compensation section 40.50 of tolerance signs of the present invention have been located at inserting section 20 and have piled up the outer surface of welding section 30.
Tolerance sign 50 can be one-body molded with pipe connector, and its shape can as arrow or other different shapes that is used to identify, comprise graduation line for the convex parts with certain given shape outstanding with respect to the outer surface of inserting section 20; Also can be the shallow slot that sink, under the prerequisite that does not influence pipe connector wall thickness rigidity, described shallow slot can have the different shape that can thinkablely be used to identify arbitrarily, as the arrowhead form that sink.
Tolerance sign 50 also can be the paster with paste functionality, and graduation line or other patterns that is used to identify are printed in the surface of paster, or directly the shape of paster are made the arbitrary shape that can be used for identifying, as arrowhead form.
Tolerance sign 50 can also be by as spray, be coated with, carve, write, different shape that means such as picture mark.
The effect of the step when below socket pipe connecting part of the present invention being connected with metallic plastic-lining pipeline to be connected and accumulation welding section 30 and flexible compensation section 40 is elaborated:
(1) at first, the needs of metallic plastic-lining pipeline port that connects and the tolerance that is located at the socket pipe connecting part outer surface being identified 50 initial position aligns, axial length (being range) by tolerance sign 50 indicates welding depth location sign on the outer surface of the outer lining metallic conduit 61 of metallic plastic-lining pipeline, described welding depth location is designated inserting section 20 and the length sum of piling up welding section 30, and, the port edge of the flexible compensation section 40 by the pipe connector outer surface of lining metal pipeline 61 outside indicates the inserting depth station location marker, identify the port of the needs connection of removing the metallic plastic-lining pipeline and the outer lining metal sleeve 61 between this welding depth location sign according to the welding depth location, expose plastic lining pipeline 62.
(2) afterwards, as shown in Figure 2, utilize hot-melting machine, stipulate according to the hot-melt technology code requirement, fused portion to pipe connector and plastic lining pipeline carries out hot melt, exposed plastic lining pipeline is inserted in the inserting section 20 of socket pipe connecting part of the present invention, till the inserting depth station location marker shown in the outer lining metallic conduit outer surface, guarantees the accurate of socket joint weld length with this.Can find according to socket pipe connecting part of the present invention, at this moment, the internal surface of ducted plastic lining pipeline 62 of metallic plastic-lining and accumulation welding section 30 and the end wall 60 of outer lining metallic conduit 61 can form the confined space of a relative closure, as shown in Figure 3, the grafting accumulation body that produces during fusion can be inserted in the described confined space by nature, and be formed with press seal and close state, because the volume of described confined space designs forr a short time than the volume of grafting accumulation body, therefore most of grafting accumulation body can be pressed fusion by envelope in described confined space, utilize the grafting accumulation body for molten and be not subjected to the characteristic of the fluid that mechanical form influences, effectively remedied the system defect that traditional socket joint hot melt connects, cause socket joint welding fusion intensity inhomogeneous as the welding slit that the out of roundness of pipe connector and plastic pipe causes, not welding and the seal leak that produces fully, or the leak source that causes of socket joint hot melt excessive velocities or the slow excessively grafting gap that produces etc.Accumulation welding section 30 parts after the fusion are identical with inserting section 20 with the integral tube wall thickness of grafting accumulation body simultaneously, satisfied the integral rigidity requirement of socket pipe connecting part.
The grafting accumulation body that does not fuse in the confined space of above-mentioned relative closure can flow in the flexible compensation section 40 of the present invention, and locate to flow to flexible compensation section port (near the outside), but because there is the bigger temperature difference in flexible compensation section 40 both sides, the grafting accumulation body with the flowing velocity of piling up welding section 30 joints greater than (wherein in the flowing velocity of flexible compensation section port, the rough surface that is located on flexible compensation section 40 inwalls is played a role to producing current difference), this current difference cause most of grafting accumulation body be stacked in the flexible compensation section 40 with the joint of piling up welding section 30 near, prevented that the grafting accumulation body from exposing to pipe connector, influence the overall appearance that pipeline connects, simultaneously in order to shorten the length of flexible compensation section 40, the conservation cost, internal surface in flexible compensation section 40 is provided with flexible compensation section groove 41, the surplus body of the grafting accumulation body that does not fuse in piling up welding section 30 is inserted in it, the accumulation body that prevents to peg graft exposes to pipe connector, but the invention is not restricted to this, also can not establish rough surface and flexible compensation section groove 41 on the inwall of flexible compensation section 40.
The space that forms between the internal surface of flexible compensation section 40 and the pipeline to be connected can be enough to hold under the prerequisite that does not have the surplus body of the grafting accumulation body of fusion in piling up welding section 30, flexible compensation section 40 also needs the expansion extension that produces when can containing pipe track media temperature variation big, preventing, and influence the defective of pipeline connection integral rigidity because of the promptly weak section of expansion extension is formed on outside the pipeline.
In addition, some grafting accumulation body can flow to the inboard of body 10, for preventing to flow to the grafting accumulation body blocking pipe of body 10 inboards, as shown in Figure 3, the present invention is provided with body groove 11 in the inboard of body 10, the sectional shape of the body groove 11 among the present invention is triangular in shape, but is not limited thereto, and its shape can be the random geometry except that triangle.The grafting accumulation body that flows in the body groove 11 solidifies in the space of the inwall of body groove 11 and the end wall formation of plastic lining pipeline 62, and combine with tube wall, further improved the sealing intensity of pipe connector and pipeline to be connected, prevented to flow to of the obstruction of body 10 interior grafting accumulation bodies simultaneously pipeline.
Socket pipe connecting part of the present invention is by forming two-way welding (the axial welding consistent with the socket joint direction and the radially welding of Vertical direction), double seal (sealing vertically and radially O type accumulation sealing) structure, the quality assurance that fundamentally perfect socket joint hot melt connects, remedied the system defect that traditional socket joint hot melt connects, the welding slit that causes as the out of roundness of pipe connector and plastic pipe causes the socket joint welding to fuse intensity inhomogeneous, not welding and the seal leak that produces fully; The leak source that socket joint hot melt excessive velocities or the slow excessively grafting gap that produces cause; Welding leak source that the socket joint deviation in driction is caused or the like.Utilize the grafting accumulation body for molten and be not subjected to the characteristic of the fluid that mechanical form influences, adopt hydromechanical structural characteristics to carry out effectively remedying the systematic error of all socket joint weldings.
The above only is a preferred implementation of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement or modification or choose wherein part etc., all these should be considered as protection scope of the present invention.
Claims (11)
1. socket pipe connecting part, the inserting section (20) that comprises body (10) and be attached thereto is characterized in that, also comprises:
Pile up welding section (30), link to each other with described inserting section (20), external diameter is identical with the external diameter of described inserting section (20), internal diameter from the joint of described inserting section (20), direction towards flexible compensation section (40) increases gradually, in the space that is used for the fusion of grafting accumulation body is formed between the end wall of described accumulation welding section (30), the ducted plastic lining pipeline of metallic plastic-lining to be connected and outer lining metallic conduit;
Flexible compensation section (40) links to each other with described accumulation welding section (30), and internal diameter is greater than the internal diameter of inserting section (20);
Tolerance sign (50) is located at described inserting section (20) and piles up the outer surface of welding section (30), and length is described inserting section (20) and the length sum of piling up welding section (30).
2. socket pipe connecting part as claimed in claim 1, it is characterized in that, described accumulation welding section (30) forms minimum diameter and maximum inner diameter, described minimum diameter is formed on the joint with inserting section (20), described maximum inner diameter is formed on the joint with flexible compensation section (40), and the difference of described maximum inner diameter and minimum diameter equals the thickness of the ducted outer lining metallic conduit of metallic plastic-lining to be connected (61).
3. socket pipe connecting part as claimed in claim 2, it is characterized in that the spatial volume that forms between the end wall of described accumulation welding section (30), the ducted plastic lining pipeline of metallic plastic-lining to be connected (62) and outer lining metallic conduit (61) is less than or equal to the volume of grafting accumulation body.
4. socket pipe connecting part as claimed in claim 3 is characterized in that, the internal surface of described flexible compensation section (40) is provided with flexible compensation section groove (41), or the internal surface of described flexible compensation section (40) is a rough surface.
5. socket pipe connecting part as claimed in claim 4 is characterized in that, the internal surface of described body (10) is provided with body groove (11).
6. socket pipe connecting part as claimed in claim 1 is characterized in that, described tolerance sign (50) is along the axial direction setting of described inserting section (20), and initial position is in the joint of described body (10) with described inserting section (20).
7. socket pipe connecting part as claimed in claim 6, it is characterized in that, described tolerance sign (50) and described inserting section (20) and to pile up welding section (30) one-body molded, described tolerance sign (50) be the convex parts given prominence to respect to the outer surface of inserting section (20) and accumulation welding section (30) or sagging shallow slot.
8. socket pipe connecting part as claimed in claim 6 is characterized in that, described tolerance sign (50) is a paster, or is the marker by spraying, be coated with, carve, write, drawing.
9. socket pipe connecting part as claimed in claim 8 is characterized in that the surface of described paster is printed on graduation line, or described paster is an arrowhead form.
10. socket pipe connecting part as claimed in claim 9 is characterized in that, is provided with one or two described tolerance sign (50) at the outer surface of each described inserting section (20) of same body (10).
11., it is characterized in that described socket pipe connecting part is thermofusible spigot pipe connector or electric smelting socket pipe connecting part as each described socket pipe connecting part in the claim 1～10.
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| CN2009100767440A CN101476658B (en) | 2009-01-16 | 2009-01-16 | Socket pipe connector |
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| CN2009100767440A CN101476658B (en) | 2009-01-16 | 2009-01-16 | Socket pipe connector |
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| CN101476658B true CN101476658B (en) | 2010-06-02 |
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| CN1648512A (en) * | 2004-01-26 | 2005-08-03 | 株式会社Acorn | Heat melting assembling connector for pipeline |
| CN2806941Y (en) * | 2005-07-15 | 2006-08-16 | 俞乃苟 | Joining pipe fitting for fusion joining of composite pipes |
| CN2913789Y (en) * | 2006-05-19 | 2007-06-20 | 岑伟达 | New type composite connecting pipe |
| CN201028212Y (en) * | 2007-02-09 | 2008-02-27 | 郭德宝 | Pipe fitting with end cover |
| CN101251217A (en) * | 2007-12-18 | 2008-08-27 | 北京航天凯撒国际投资管理有限公司 | Hot melt spigot-and-socket special pipe fittings for metallic plastic-lining pipe |
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