CN221629115U

CN221629115U - Diameter-reducing-prevention pipe joint

Info

Publication number: CN221629115U
Application number: CN202322926352.7U
Authority: CN
Inventors: 周刚刚; 赖勇华; 王禹; 高聪
Original assignee: Jiangxi Liansu Technology Industry Co ltd
Current assignee: Jiangxi Liansu Technology Industry Co ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2024-08-30
Anticipated expiration: 2033-10-31

Abstract

The utility model relates to the technical field of pipe joints, in particular to an anti-shrinkage pipe joint, which comprises a plastic shell and a hollow metal insert, wherein the metal insert comprises an embedding part and a cylindrical guide part, the embedding part is embedded with the plastic shell, and an inserting space for hot melt insertion is formed between the guide part and the plastic shell. The utility model can provide centering guide when the pipeline is in hot melting connection, improves the connection precision, adopts the metal material for the guide part, is not easy to cause expansion with heat and contraction with cold, can avoid the shrinkage of the inner wall of the pipe, and greatly improves the quality of the hot melting connection of the pipe.

Description

Diameter-reducing-prevention pipe joint

Technical Field

The utility model relates to the technical field of pipe joints, in particular to an anti-shrinkage pipe joint.

Background

Compared with the traditional cast iron pipe, galvanized steel pipe, cement pipe and other pipes, the PPR pipe has the advantages of energy conservation, material saving, environmental protection, light weight, high strength, corrosion resistance, smooth inner wall, no scaling, simple and convenient construction and maintenance, long service life and the like, and is widely applied to the building industry, municipal administration, industry and agriculture fields such as building water supply and drainage, urban and rural water supply and drainage, urban fuel gas, electric power and optical cable sheaths, industrial fluid transportation, agricultural irrigation and the like.

The connection mode mostly adopts hot-melt welding, namely, the outer circular surface of the end part of the pipe and the inner circular surface of the end part of the pipe are heated by using a hot-melt welding machine, so that the material at the position of the pipe is heated to form a molten state, and then the pipe and the pipe are inserted into a centering bearing for welding. In the welding process, the condition that the pipe is not aligned with the pipe fitting is easy to occur, and the condition is very easy to cause that the pipe is unqualified in the welding and the pipe fitting, so that the diameter reduction is generated inside to influence the water consumption experience of a user.

Chinese patent discloses a hot melt pipe joint, which comprises a joint body and at least one joint component; the joint assembly comprises a hot melt piece and a positioning piece; the positioning piece is arranged on the inner side of the hot melting piece to socket and position a pipe fitting connected with the joint assembly; the joint component is in hot-melt sealing connection with the pipe fitting through the hot-melt piece. Meanwhile, the water pipe joint device with the hot melt pipe joint is also provided. By adopting the technical scheme of the invention, the structure of the hot melting pipe is changed, so that the hot melting pipe joint and the hot melting part of the pipe fitting can be quickly and accurately positioned and connected in the installation process, the operation difficulty is reduced, the yield after hot melting is ensured, and the water leakage rate of the hot melting pipe in the welding process is reduced. But the locating piece and the joint body integrated into one piece of this hot melt coupling are hot melt material, and locating piece inner wall softens and easily appears collapsing after the heating is connected to lead to the pipeline reducing, buries down the potential safety hazard for the production use in the future.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art, and provides the anti-shrinkage pipe joint which can provide centering guide when a pipeline is subjected to hot melting connection, so that the connection precision is improved, the shrinkage of the inner wall of the pipe can be avoided, and the quality of the hot melting connection of the pipe is greatly improved.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The anti-shrinkage pipe joint comprises a plastic shell and a hollow metal insert, wherein the metal insert is arranged in the plastic shell; the metal insert comprises an embedding part and a cylindrical guide part which are connected with each other, wherein the embedding part is communicated with the inside of the guide part, the embedding part is embedded in the plastic shell, and an inserting space for hot melt insertion is formed between the guide part and the plastic shell.

Through this kind of setting mode, the grafting space can carry out socket joint location to the pipe fitting, when needs carry out the hot melt with tubular product and coupling and be connected, the user heats between guide part and the plastics shell earlier, insert the pipe fitting of hot melt state in the grafting space between guide part and the plastics shell again, pipe fitting inner wall and guide part butt, pipe fitting outer wall and plastics shell butt, guarantee the coaxial setting of pipe fitting and coupling through the guiding effect of guide part, and the guide part of metal material plays the effect of support at the tubular product inner wall, avoid the inside collapse deformation that takes place of tubular product of hot melt state.

Preferably, the end of the guide remote from the engagement portion projects axially beyond the plastic housing.

By means of the arrangement mode, when the pipeline in the hot melting state is inserted, the convexly arranged guide part can play a guiding role, so that the pipeline is ensured to be inserted along the centering path.

Further, the protruding length of the guide part is at least 5mm.

Preferably, the guide part is in a cone structure, and the outer diameter of the end part of the guide part far away from the scarf joint part is smaller than the outer diameter of the end part near the scarf joint part.

Through this kind of setting method, the minimum external diameter of guide part is less than the internal diameter of tubular product, the maximum external diameter of guide part is greater than the internal diameter of tubular product, when inserting the tubular product, the guide part outside be with tubular product clearance fit earlier, transition to the transition fit at guide part middle part gradually again, at last be close to the afterbody interference fit of scarf joint portion at the guide part, can ensure the smoothness nature of direction, can ensure the guide part again and tubular product in close contact after the hot melt, improve the hot melt stability.

Further, the taper of the cone structure of the guide part is 0.5-0.6 degrees.

Preferably, a plurality of grooves are arrayed along the circumference of the guide part, and the grooves are arranged along the axial direction.

Through this kind of setting method, when tubular product and guide interference fit, the clout that is extruded can pack into in the axial slot, makes tubular product pipe fitting be difficult for taking place relative rotation when hot melt connection.

Preferably, an annular limiting ring is arranged on the outer side of the guide part, and the limiting ring is positioned on the end part, close to the scarf joint part, of the guide part and is abutted to the bottom of the splicing space in the plastic shell.

Through this kind of setting method, when the grafting space between tubular product grafting guide part and the plastic housing, can stop in spacing ring department, again because the guide part is close to the one section of scarf joint portion and tubular product interference fit, the clout of tubular product can pile up in the accommodation space that forms between spacing ring and the plastic housing to avoid clout to spill over or internal pressure is too big to lead to the tubular product unable abundant to insert.

Further, the height of the limiting ring is 1mm-1.5mm.

Preferably, a plurality of annular bosses are arranged on the outer side of the scarf joint part, and an annular groove is formed between two adjacent annular bosses.

Through this kind of setting, when metal insert and plastic casing pass through injection moulding, annular boss can be embedded in the plastic casing to make the scarf joint portion more inseparable with plastic casing's connection.

Preferably, the end part of the scarf joint part, which is close to the guide part, is provided with a rotation stopping boss, and the rotation stopping boss is axially provided with a plurality of rotation stopping grooves.

By this arrangement, a relative rotation between the scarf joint and the plastic housing can be avoided. When the plastic shell is injection molded, plastic can infiltrate into the spacing grooves between the bulges, and after solidification molding, the embedding part and the plastic shell can not rotate relatively due to the limitation of the bulges.

Preferably, an internal thread structure is arranged on the inner wall of the hollow part of the scarf joint part.

By this arrangement, the scarf joint can be screwed with the externally threaded pipe.

Preferably, one end of the scarf joint part far away from the guide part is convexly provided with a mounting pipe, and the outer wall of the mounting pipe is provided with an external thread structure.

By this arrangement, the mounting tube can be screwed with the female screw interface.

Preferably, the anti-shrinkage pipe joint can be provided with a straight-through structure, in particular, the plastic shell is provided with a straight-head structure, and the metal insert is also provided with the straight-head structure.

Preferably, the anti-shrinkage pipe joint can be provided with an elbow structure, specifically, the plastic shell is provided with a first bending part, and a second bending part which is matched with the first bending part is arranged between the guiding part and the scarf joint part of the metal insert.

By the arrangement mode, the pipe joints with different structures can be selected according to different use scenes, and the application range of the utility model is improved.

When the shrink-proof pipe joint is used for hot melt connection, firstly, the insertion space between the plastic shell and the guide part is heated by the heater, so that the inner wall of the plastic shell is in a molten state, and the guide part made of metal is in a high-temperature state; simultaneously, the pipe to be spliced is subjected to heat treatment, so that the outer surface of the pipe is in a molten state, then the pipe is spliced along the outer end of the guide part, the guide part is attached to the inner wall of the pipe, the pipe and the pipe joint are kept in a centered state, then the pipe and the pipe joint are slowly moved in opposite directions until the pipe cannot move after being abutted against the limiting ring, the guide part made of metal materials is heated to a high-temperature state in the process, and when the inner wall of the pipe is contacted with the guide part, the material of the inner wall of the pipe is melted and then filled into an axial groove of the outer surface of the guide part, so that the pipe and the pipe joint are not easy to rotate in the hot-melt splicing process.

Compared with the prior art, the utility model has the beneficial effects that:

(1) In the process of hot melting and inserting of the pipe fitting, the metal guide part plays a role in centering and positioning the hot melting pipe, and the metal guide part cannot be easily deformed during hot melting, so that the pipe fitting hot melting socket is prevented from being not centered or the guide part is prevented from collapsing to cause shrinkage of the pipe.

(2) The guide part is of a cone structure, so that the pipe and the guide part are more convenient to plug and interference fit, and the axial groove and the limiting ring are arranged on the outer side of the guide part, so that surplus materials of interference fit during hot melt connection can be contained, and the pipe joint are more tightly and firmly connected.

Drawings

FIG. 1 is a schematic view of a first view angle structure of a first embodiment of an anti-shrink tube fitting according to the present utility model;

FIG. 2 is a schematic view of a first embodiment of an anti-shrink tube fitting according to the present utility model;

FIG. 3 is a schematic view in section A-A of FIG. 2;

FIG. 4 is a schematic view of a metal insert structure of a first embodiment of an anti-shrink tube fitting according to the present utility model;

FIG. 5 is a schematic view of a second embodiment of an anti-shrink tube fitting according to the present utility model;

FIG. 6 is a schematic view of a second view angle of a second embodiment of an anti-shrink tube fitting according to the present utility model;

FIG. 7 is a schematic view in section B-B of FIG. 6;

FIG. 8 is a schematic view of a third embodiment of an anti-reducing coupler according to the present utility model;

FIG. 9 is a schematic view of a third embodiment of a shrink-proof pipe joint according to the present utility model;

Fig. 10 is a schematic view of section C-C of fig. 9.

The graphic indicia are illustrated as follows:

1. A plastic housing; 11. a first bending portion; 2. a metal insert; 21. an engagement portion; 211. an annular boss; 212. a rotation stopping boss; 213. installing a pipe; 22. a guide part; 221. an axial groove; 222. a limiting ring; 223. and a second bending part.

Detailed Description

The utility model is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

Example 1

Referring to fig. 1 to 4, a first embodiment of an anti-reducing pipe joint according to the present utility model includes a plastic housing 1 and a hollow metal insert 2, wherein the metal insert 2 is installed in the plastic housing 1; the metal insert 2 comprises an embedding part 21 and a cylindrical guide part 22 which are connected with each other, the embedding part 21 is communicated with the inside of the guide part 22, the embedding part 21 is embedded in the plastic shell 1, and an inserting space for hot melt insertion is formed between the guide part 22 and the plastic shell 1.

Through this kind of setting mode, the grafting space can carry out socket joint location to the pipe fitting, when needs carry out hot melt with tubular product and coupling and be connected, the user heats between guide part 22 and the plastics shell 1 earlier, inserts the pipe fitting of hot melt state in the grafting space between guide part 22 and the plastics shell 1 again, pipe fitting inner wall and guide part 22 butt, pipe fitting outer wall and plastics shell 1 butt, guarantee the coaxial setting of pipe fitting and coupling through the guiding action of guide part 22, and the guide part 22 of metal plays the effect of support at the tubular product inner wall, avoid the inside collapse deformation that takes place of tubular product of hot melt state.

As an embodiment of the utility model, the guide 22 is arranged protruding from the plastic housing 1 in the axial direction away from the end of the scarf joint 21, and the protruding length is 5mm.

In this way, the convexly arranged guide portion 22 can act as a guide when inserting the tube in the hot-melt state, ensuring that the tube is inserted along the centering path.

As one embodiment of the present utility model, the outer surface of the guide portion 22 is a tapered surface, the taper of the tapered surface is 0.5 °, and the outer diameter of the end of the guide portion 22 away from the engagement portion 21 is smaller than the outer diameter of the end near the engagement portion 21.

Through this kind of setting, the minimum external diameter of guide part 22 is less than the internal diameter of tubular product, and the maximum external diameter of guide part 22 is greater than the internal diameter of tubular product, and when inserting the tubular product, guide part 22 outside is first with tubular product clearance fit, then gradually transition to the transition fit at guide part 22 middle part, finally is close to the afterbody interference fit of scarf joint portion 21 at guide part 22, can ensure the smoothness nature of direction, can ensure the inseparable contact of guide part 22 and tubular product after the hot melt again, improves the hot melt stability.

As an embodiment of the present utility model, four grooves 221 are circumferentially arrayed along the guide portion 22, the grooves 221 being disposed in the axial direction.

By this arrangement, when the pipe is in interference fit with the guide portion 22, the extruded excess material fills the axial groove 221, so that the pipe is not easy to rotate relatively during hot melt connection.

As an embodiment of the present utility model, an annular stop ring 222 is disposed outside the guide portion 22, and the stop ring 222 is located at an end portion of the guide portion 22 near the engagement portion 21 and abuts against the bottom of the insertion space in the plastic housing 1.

Through this kind of setting scheme, when tubular product grafting inserted into the grafting space between guide part 22 and the plastics shell 1, can stop in spacing ring 222 department, again because the one section that guide part 22 is close to scarf joint portion 21 and tubular product interference fit, the clout of tubular product can pile up in the accommodation space that forms between spacing ring 222 and the plastics shell 1 to avoid clout to spill over or internal pressure too big to lead to the tubular product unable abundant to insert.

As one embodiment of the present utility model, the height of the stop collar 222 is 1.3mm.

As an embodiment of the present utility model, a plurality of annular bosses 211 are provided on the outer side of the scarf joint 21, and an annular groove is formed between two adjacent annular bosses 211.

In this way, when the metal insert 2 and the plastic housing 1 are injection molded, the annular boss 211 can be embedded into the plastic housing 1, thereby making the connection of the scarf joint 21 and the plastic housing 1 tighter.

As an embodiment of the present utility model, the end of the engagement portion 21 near the guide portion 22 is provided with a rotation stopping boss 212, and the rotation stopping boss 212 is provided with a plurality of rotation stopping grooves along the axial direction.

By this arrangement, a relative rotation between the engagement portion 21 and the plastic housing 1 can be avoided. When the plastic housing 1 is injection molded, the plastic can penetrate into the space between the projections, and after the solidification molding, the engagement portion 21 and the plastic housing 1 cannot rotate relatively due to the restriction of the projections.

As an embodiment of the present utility model, an internal thread structure is provided on the inner wall of the hollow of the caulking portion 21.

By this arrangement, the scarf joint 21 can be screwed with the externally threaded pipe.

As an embodiment of the present utility model, the anti-shrinkage pipe joint may have a straight structure, the plastic housing 1 has a straight structure, and the metal insert 2 has a straight structure.

Example 2

Fig. 5 to 7 show a second embodiment of the anti-reduction pipe joint according to the present utility model, which is similar to embodiment 1, except that the threads for connection according to the present utility model have an external thread structure.

As an embodiment of the present utility model, the end of the scarf joint 21 away from the guide 22 is provided with a mounting tube 213 in a protruding manner, and the outer wall of the mounting tube 213 is provided with an external thread structure. In this arrangement, the mounting tube 213 can be screwed to the female screw interface.

Example 3

Fig. 8 to 10 show a third embodiment of the anti-reducing pipe joint according to the present utility model, which is similar to embodiment 1, except that the anti-reducing pipe joint according to the present utility model has a bent pipe structure.

As an embodiment of the present utility model, the shrink-proof pipe joint may have an elbow structure, the plastic housing 1 has an elbow structure, the plastic housing 1 is provided with a first bending portion 11, and a second bending portion 223 engaged with the first bending portion 11 is provided between the guide portion 22 and the engagement portion 21 of the metal insert 2. By this arrangement, the embodiment can be adapted to the use situation where it is necessary to change the direction of the connection.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The anti-shrinkage pipe joint is characterized by comprising a plastic shell (1) and a hollow metal insert (2), wherein the metal insert (2) is arranged in the plastic shell (1); the metal insert (2) comprises an embedding part (21) and a cylindrical guide part (22) which are connected with each other, wherein the embedding part (21) is communicated with the inside of the guide part (22), the embedding part (21) is embedded in the plastic shell (1), and an inserting space for hot melt insertion is formed between the guide part (22) and the plastic shell (1).

2. A shrink-proof pipe joint as claimed in claim 1, characterized in that the end of the guide part (22) remote from the scarf joint (21) protrudes axially beyond the plastic housing (1).

3. The shrink-proof pipe joint according to claim 1, wherein the guide part (22) has a cone structure, and an outer diameter of an end of the guide part (22) far from the scarf joint part (21) is smaller than an outer diameter of an end near the scarf joint part (21).

4. A shrink-proof pipe joint as claimed in claim 3, characterized in that a plurality of grooves (221) are arrayed along the circumference of the guide part (22), the grooves (221) being arranged in the axial direction.

5. The anti-shrinkage pipe joint according to claim 1, wherein a limiting ring (222) is arranged on the outer side of the guide part (22), and the limiting ring (222) is positioned on the end part, close to the scarf joint part (21), of the guide part (22).

6. The shrink-proof pipe joint according to claim 5, wherein the end of the limiting ring (222) close to the scarf joint (21) is abutted with the bottom of the plugging space in the plastic shell (1).

7. A shrink-proof pipe joint according to any one of claims 1-6, characterized in that the outside of the scarf joint (21) is provided with a plurality of annular bosses (211), and an annular groove is formed between two adjacent annular bosses (211).

8. The shrink-proof pipe joint according to claim 7, wherein the end of the engagement portion (21) close to the guiding portion (22) is provided with a rotation stopping boss (212), and the rotation stopping boss (212) is provided with a plurality of rotation stopping grooves along the axial direction.

9. The shrink-proof pipe joint according to claim 8, wherein an inner wall of the hollow part of the scarf joint (21) is provided with an inner thread structure, or one end of the scarf joint (21) far away from the guiding part (22) is provided with a mounting pipe (213) in a protruding manner, and an outer thread structure is arranged on the outer wall of the mounting pipe (213).

10. A shrink-proof pipe joint according to claim 8, characterized in that the plastic housing (1) is of straight or bent construction.