CN209925801U

CN209925801U - Plastic-coated metal water supply pipe fitting

Info

Publication number: CN209925801U
Application number: CN201822118763.2U
Authority: CN
Inventors: 黄伟; 黄妍备
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2020-01-10
Anticipated expiration: 2028-12-17

Abstract

The utility model relates to a cover and mould metal water supply pipe spare, it includes feed pipe and pipe connector spare, and the feed pipe is outside to be covered and mould, inside be the tubular metal resonator, and the pipe connector spare includes that outside plastic housing and inside metal are taken over, is equipped with the pipe connector mouth that is used for the hot melt to connect the feed pipe between plastic housing and the metal are taken over. The design key points are that an annular expansion ring is arranged in the metal connecting pipe of the pipe connecting piece at the joint of the metal connecting pipe and the bottom of the plastic housing inner pipe interface, the annular expansion ring is subjected to expansion molding through an expansion machine, and the annular expansion ring limits the metal connecting pipe in the plastic housing. The end part of the metal pipe of the water supply pipe is flared by a flaring machine to form a conical flaring, and when the water supply pipe is connected and fixed with the pipe connecting piece, the flaring of the metal pipe in the water supply pipe is tightly propped against the annular expansion ring of the metal connecting pipe in the pipe connecting piece to form contact sealing. The utility model has the advantages of simple integral structure, convenient manufacture and processing, reliable water supply pipe connection, long service life, and difficult corrosion and corrosion.

Description

Plastic-coated metal water supply pipe fitting

Technical Field

The utility model relates to a delivery pipe field is a cover and moulds metal water supply pipe spare.

Background

The plastic-coated metal water supply pipe is characterized in that the inner part is a metal pipe, the outer part is a plastic layer, a connecting piece for connecting the water supply pipe is also in a structure of an inner metal piece and an outer plastic layer, the connecting piece is usually a straight-through pipe, a right-angle bent pipe and a three-way bent pipe, and the end part of the connecting piece forms a pipe interface. The water supply pipe and the connector of the connecting piece are spliced through a metal pipe and a metal connecting pipe and are matched with outer-layer plastic hot melt for sealing connection; for example, the publication of the patent documents in china on the publication entitled "connecting piece for plastic-coated stainless steel water supply pipe and connecting structure for plastic-coated stainless steel water supply pipe" on the publication of publication No. 5/8/2013 and No. CN 202927347U; the invention also discloses a plastic-coated metal water supply pipeline connecting structure and a plastic-coated metal water supply pipe connecting piece thereof, as published in Chinese patent literature under the publication number CN100504136C, on the publication date 2009, 6-24. The technical structures disclosed in the above two patent documents are approximately similar, and the sealing ring is designed in the early technical scheme, but considering that the actual sealing effect is not good, and the problems of water pollution, water leakage and the like are easily caused due to the aging problem of the sealing ring, so the sealing ring structure is cancelled in the later technical scheme. However, the following defects still exist in the later technical scheme: 1. when the metal pipe in the water supply pipe is inserted into the metal lining of the connecting piece, a gap is inevitably formed between the metal pipe and the metal lining, the gap is communicated or contacted with the plastic part, so that dead water remained in the gap is contacted with the plastic, and along with the increase of service life, the problems of corrosion, corrosion and the like easily occur in the gap, and finally the reliability of water quality and the pipe joint is influenced. 2. The metal lining and the outer plastic layer in the connecting piece are formed by conventional thermoplastic molding, but the drawing clearly shows that the metal lining and the outer plastic layer are not effectively limited after being formed, so that the metal lining and the outer plastic layer are easily separated in actual use, and the connection reliability of the water supply pipe is affected. For this reason, improvements to existing plastic-coated metal water supply pipes are desired.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a plastic-coated metal water supply pipe fitting for the field, which solves the technical problems of unreliable connection, easy failure and short service life of the existing like products. The purpose is realized by the following technical scheme.

The utility model provides a cover and mould metal water supply pipe spare, its includes feed pipe and pipe connector, and the feed pipe is outside for covering moulds, inside is the tubular metal resonator, and the pipe connector includes outside plastic housing and inside metal takeover, is equipped with between plastic housing and the metal takeover to be used for the hot melt to be connected the pipe connector of feed pipe, and when connecting, the metal takeover of pipe connector inserts in the tubular metal resonator of feed pipe. The plastic housing pipe joint is structurally characterized in that an annular expansion ring is arranged in the metal connecting pipe of the pipe joint piece at the joint of the metal connecting pipe and the bottom of the plastic housing inner pipe joint, namely the annular expansion ring limits the metal connecting pipe in the plastic housing; when the water supply pipe is fixedly connected with the pipe connector, the flaring of the metal pipe in the water supply pipe is tightly propped against the annular expansion ring of the metal connecting pipe in the pipe connector to form contact sealing. Through the structure, when the water supply pipe is connected with the pipe connector, the metal pipe of the water supply pipe and the metal connecting pipe of the pipe connector form ball cone sealing, so that the contact between a gap between the water supply pipe and the pipe connector and an external plastic housing is effectively prevented, the water supply pipe is not easy to corrode and rust, the connection reliability of the water supply pipe is improved, and the service life of the water supply pipe is prolonged. In addition, the metal connecting pipe of the pipe connecting piece is provided with the annular expansion ring to play a role in limiting, so that the metal connecting pipe is ensured to be fixed relative to the plastic housing, the problem of separation and movement is not easy to occur, and the reliability of the connection of the water supply pipe is further improved.

In the plastic-coated metal water supply pipe fitting, the metal connecting pipe in the pipe fitting is provided with at least one annular limiting ring in an expansion molding mode, and the annular limiting ring is embedded into the plastic housing and is not exposed when the pipe fitting is subjected to injection molding. Because the annular expansion ring of the metal connecting pipe has certain elasticity, when the water supply pipe is connected with the pipe connector in a hot melting mode, the deformation of the annular expansion ring still has the possibility of leading the metal connecting pipe in the pipe connector to be moved.

Furthermore, the annular limiting ring is an annular body welded on the outer wall of the metal connecting pipe. Compared with a structure that the metal connecting pipe expands to form the annular limiting ring, the structure that the annular body is welded is easier to process and operate.

Furthermore, the section of the annular limiting ring is arc-shaped or conical. The shape of the annular limiting ring and the shape of the outer plastic structure for effective limiting can be realized.

In the plastic-coated metal water supply pipe fitting, the annular expansion ring is replaced by an annular welding ring, namely the annular welding ring is welded on the metal connecting pipe to form an annular structure of the annular expansion ring. Similarly, the structure can realize the sealing of the metal pipe of the water supply pipe and the metal connecting pipe of the pipe connecting piece.

In the plastic-coated metal water supply pipe fitting, the pipe fitting is any one of a three-way shape, a bent pipe shape and a straight pipe shape. I.e., the conventional pipe coupling shapes may all be designed using the above-described construction.

In the plastic-coated metal water supply pipe, the section of the annular expansion ring is arc-shaped or conical. The circular arc and the flaring of the water supply pipe form a ball cone seal, and the cone and the flaring of the water supply pipe form a cone seal, namely the structural style of the annular expansion ring can realize that the flaring of the annular expansion ring and the water supply pipe can form a ball cone seal or a cone seal.

In the plastic-coated metal water supply pipe fitting, the metal connecting pipe of the pipe fitting is in conical splicing fit with the metal pipe of the water supply pipe to form conical sealing.

The molding method of the plastic-coated metal water supply pipe comprises the following steps: the flaring of the end part of the metal pipe in the water supply pipe is performed by using a flaring machine, the annular expansion ring of the metal connecting pipe in the pipe connecting piece is subjected to expansion operation by using the expanding machine, the outside of the flared metal pipe is subjected to plastic coating by using a plastic coating machine to form the water supply pipe, and the metal connecting pipe is positioned after being manufactured into the annular expansion ring and is placed into a pipe connecting piece die for injection molding to form the pipe connecting piece.

The utility model discloses overall structure is comparatively simple, and the preparation processing is comparatively convenient, and the feed pipe is connected comparatively reliably, and long service life is difficult for corroding and takes place the corrosion, is fit for using as the feed pipe spare in current water supply field, or the institutional advancement of like product.

Drawings

Fig. 1 is a schematic sectional view of the pipe joint of the present invention.

Fig. 2 is a schematic sectional view of the water supply pipe of the present invention.

Fig. 3 is a schematic view of the metal adapter structure of fig. 1.

Fig. 4 is a sectional view schematically showing the connection of a service pipe to the pipe joint of fig. 1.

Fig. 5 is a schematic structural view of a modification of fig. 3.

Fig. 6 is a sectional view schematically showing the connection of a water feed pipe using the pipe joint of fig. 5.

Fig. 7 is a schematic structural view of the pipe connector of the present invention in a three-way shape, and the annular expansion ring in the figure is in a cone shape.

Fig. 8 is a schematic view of a further improved structure of the metal connecting pipe of the pipe connecting member of the present invention.

Fig. 9 is a schematic view of an improved structure of the water supply pipe of the present invention.

Fig. 10 is a schematic structural view of a straight pipe connector according to the present invention.

The sequence numbers and names in the figure are: 1. the plastic expansion joint comprises a plastic housing, 101, a pipe joint, 2, a metal connecting pipe, 201, an annular expansion ring, 202, an annular limiting ring, 3, a plastic coating layer, 4, a metal pipe, 401 and a flaring.

Detailed Description

The invention will now be further described with reference to the accompanying drawings.

As shown in fig. 1-4, the plastic-coated metal water supply pipe comprises a water supply pipe and a pipe connector, wherein the outer part of the water supply pipe is a plastic-coated layer 3, and the inner part of the water supply pipe is a metal pipe 4, when the plastic-coated metal water supply pipe is processed, a flaring operation is carried out on the end part of the metal pipe through a flaring machine to form a conical flaring 401, and then the outer part of the metal pipe is subjected to plastic-coated processing through the plastic-coated machine to form the water supply pipe. The pipe connector comprises a plastic housing 1 and an internal metal connecting pipe 2, when the pipe connector is processed, the metal connecting pipe is expanded through an expander to form two annular expansion rings 201, then the metal connecting pipe is bent through a pipe bending machine to form a state shown in figure 3, finally the metal connecting pipe in the state shown in figure 3 is positioned and placed into a corresponding pipe connector mould to be injection-molded to form the pipe connector shown in figure 1, two pipe interfaces 101 used for connecting a water supply pipe are formed between the metal connecting pipe and the plastic housing in the pipe connector, and the annular expansion rings of the metal connecting pipe are positioned at the joint of the metal connecting pipe and the plastic housing in the two pipe interfaces and effectively limit the metal connecting pipe and the plastic housing. When the water supply pipe is connected with the pipe connector, as shown in fig. 4, the water supply pipe is connected with the pipe connector mouth of the pipe connector through hot melting, and after connection, the flaring of the metal pipe in the water supply pipe is tightly abutted with the annular expansion ring of the metal connecting pipe in the pipe connector to form contact sealing.

As shown in fig. 5 and 6, the metal connecting pipe 2 in the pipe connector may also be provided with an annular limiting ring 202 embedded in the plastic housing 1 during the injection molding of the pipe connector, and the annular limiting ring may be formed by the above-mentioned annular expansion pipe forming process or welded to the metal connecting pipe by using an annular body.

In addition to the above structure, the annular expansion ring 201 of the plastic-coated metal water supply pipe may also be replaced by an annular welding ring, that is, the annular welding ring is welded to the metal connecting pipe 2 to form the annular structure of the annular expansion ring. The effect of sealing the metal pipe 4 in the water supply pipe and the metal connecting pipe in the pipe connector can also be achieved, but the expansion forming process is preferably adopted, and the expansion forming structure has elasticity, so that the sealing is easier to form.

The plastic-coated metal water supply pipe fitting may also be a three-way pipe fitting as shown in fig. 7, a straight pipe fitting as shown in fig. 10, or other conventional pipe fitting shape patterns, besides the right-angle pipe fitting. The utility model discloses a grafting cooperation between pipe connector and the feed pipe can be cylindricality grafting cooperation, does to adopt like the toper grafting cooperation shown in figure 8, figure 9, and the toper cooperation can form the awl and seal, further improves the sealed effect of pipe connector. In addition, the cross-sectional shape of the annular expansion ring of the pipe joint may be circular arc as shown in fig. 5, or may be tapered as shown in fig. 7, but the cross-sectional shape is not limited to the above shape, and other shapes may be used to achieve ball cone sealing or cone sealing. Similarly, the pipe connector and the annular limiting ring of the water supply pipe can be both in shapes capable of realizing effective limiting.

The above contents are intended to illustrate the technical means of the present invention, and do not limit the technical scope of the present invention. Obvious modifications to the invention, combined with the prior common general knowledge, are also within the scope of the claims of the invention.

Claims

1. A plastic-coated metal water supply pipe fitting comprises a water supply pipe and a pipe connector, wherein the outer part of the water supply pipe is coated with plastic, the inner part of the water supply pipe is a metal pipe (4), the pipe connector comprises an outer plastic housing (1) and an inner metal connecting pipe (2), a pipe connector (101) for connecting the water supply pipe in a hot melting manner is arranged between the plastic housing and the metal connecting pipe, and the metal connecting pipe of the pipe connector is inserted into the metal pipe of the water supply pipe during connection; the pipe joint is characterized in that an annular expansion ring (201) is arranged in the metal connecting pipe (2) of the pipe joint at the joint of the metal connecting pipe and the bottom of the inner pipe interface (101) of the plastic housing (1), namely the annular expansion ring limits the metal connecting pipe in the plastic housing; the end part of the metal pipe (4) of the water supply pipe forms a conical flaring (401), and when the water supply pipe is fixedly connected with the pipe connector, the flaring of the metal pipe in the water supply pipe is tightly propped against the annular expansion ring of the metal connecting pipe in the pipe connector to form contact sealing.

2. A plastic-coated metal water supply pipe according to claim 1, wherein the metal nipple (2) of the pipe connector is formed by expansion with at least one annular retainer (202) which is embedded in the plastic casing (1) without being exposed when the pipe connector is injection molded.

3. A plastic-coated metal water feeding pipe fitting according to claim 2, wherein the annular retainer (202) is an annular body welded to the outer wall of the metal adapter (2).

4. The plastic-coated metal water feeding pipe fitting as claimed in claim 2 or 3, wherein the cross-section of the annular retainer ring (202) is circular arc-shaped or conical.

5. A plastic-coated metal water feeding pipe fitting according to claim 1, characterized in that the annular expansion ring (201) is replaced by an annular welding ring, i.e. the annular welding ring is welded to the metal nipple (2) to form an annular structure of the annular expansion ring.

6. The plastic-coated metal water supply pipe fitting as claimed in claim 1, wherein the pipe fitting is any one of a tee-joint shape, a bent pipe shape and a straight pipe shape.

7. A plastic-coated metal water feeding pipe according to claim 1, wherein the cross-section of the annular expansion ring (201) is circular arc-shaped or conical.

8. A plastic-coated metal water supply pipe according to claim 1, wherein the metal nipple (2) of the pipe connector and the metal pipe (4) of the water supply pipe are in tapered plug-in fit and form a tapered seal.