WO2019080895A1

WO2019080895A1 - Metal pipe connection structure having composite snap ring

Info

Publication number: WO2019080895A1
Application number: PCT/CN2018/111855
Authority: WO
Inventors: 周庆念; 余张法
Original assignee: 周庆念; 余张法
Priority date: 2017-10-26
Filing date: 2018-10-25
Publication date: 2019-05-02
Also published as: CN109707924A

Abstract

Provided is a metal pipe connection structure having a composite snap ring, comprising: a snap-ring pipe member (1), the inner peripheral surface of the socket end of which is at least provided with a sealing groove (2) and a snap-ring groove (3), the snap-ring groove (3) being located on the outer side of the sealing groove (2) in the axial direction; a sealing ring (4), arranged in the sealing groove (2); and a composite snap ring (6), comprising a ring-shaped metal snap-ring piece (601) having a notch, and at least one annular ring; the annular ring and the metal snap ring (601) are arranged coaxially and integrated as one piece, and arranged in the snap-ring groove (3); when a metal pipe (7) is fully inserted into the socket of the snap-ring pipe member (1), a crimping tool is used to compress the sealing groove (2) and the snap-ring groove (3) of the snap-ring pipe member (1) and cause same to deform, thereby causing the metal pipe to deform accordingly by means of the tightening deformation of the composite snap ring; hence, a sealing connection between the metal pipe snap-ring pipe members is achieved by means of the sealing ring and the composite snap ring. The described structure prevents damage caused by fluid infiltrating the location of damage of the inserted metal pipe, and improves efficiency and accuracy in assembly.

Description

Metal pipe connection structure with composite snap ring

Technical field

The invention relates to a metal pipe connection structure, in particular to a metal pipe connection structure with a composite snap ring.

Background technique

Fluid delivery pipes are often used in the construction and industrial sectors. Conventional fluid delivery pipes are connected by pipe fittings, which are usually threaded to form various piping systems. As a mature pipe fitting connection method, the installation efficiency of the threaded connection is not high, and there are certain requirements for the working space, and a series of problems such as preventing leakage at the joint are also solved.

For this reason, in recent years, the connection structure of the snap-in metal pipe fittings has been gradually developed. The thin-walled metal tube design uses a special tool to crimp and deform the thin wall, so that the pipe connection is completed instantaneously. As shown in FIG. 1A, in the cross-sectional view of the snap-in connection, the crimping tool simultaneously presses the two portions of the socket section M and the sealing groove N, and the sealing groove portion is compressed, forcing the O-ring seal in the groove to closely adhere to the steel pipe. The function of sealing and stopping water is that the socket section M is pressed by the hexagon, and the steel pipe and the pipe fitting are pressed and deformed, and the rigidity of the metal material itself is utilized to resist the drawing.

The structure is simple in construction, short in operation time, no threaded connection of the joint, no complicated threading operation, no high temperature open flame, no pre-treatment during welding, no oil pollution or welding slag pollution during construction cutting or joining.

In the snap-fit metal pipe connection structure, the key can be made of various metal materials, such as stainless steel, copper, carbon steel pipe, and the like. In piping systems that have certain corrosive requirements (for example, fire sprinkler systems in buildings), stainless steel or copper fittings can be used, but this also leads to an increase in material costs. Therefore, in the current card-type connecting pipeline, more carbon steel galvanized thin-walled tubes are still used, and the connection method is still stuck-type, so that the cost performance is higher than that of the stainless steel tube and the copper tube.

However, the use of galvanized carbon steel pipes in the snap-fit metal pipe joint structure has great drawbacks. Fig. 1B shows an enlarged view of a portion B of the snap-in metal pipe connecting structure of Fig. 1A. As shown in FIG. 1B, since the socket portion M of the snap-in tubular member 91 is subjected to hexagonal pressing, the galvanized carbon steel pipe 92 and the pipe member are frictionally deformed, resulting in the outer wall of the galvanized carbon steel pipe 92 and the inner wall of the pressed tubular member 91. The galvanized layer is destroyed, and the water flow F in the pipe flows from the gap of the cannula to the hex extrusion deformation portion, and the galvanized layer of the inner wall of the galvanized carbon steel pipe 92 and the pressed pipe member 91 has been destroyed. Carbon steel pipes and snap-in pipe fittings are eroded and oxidized under the action of water flow, thereby making the service life of the pipe greatly reduced.

In addition, in the process of inserting the metal tube into the snap-in metal pipe member, the insertion end easily causes damage or displacement of the rubber sealing ring, resulting in a tight seal.

The information disclosed in the Background of the Invention is only intended to provide an understanding of the general background of the invention, and should not be construed as an admission or in any way.

Summary of the invention

The object of the present invention is to provide a metal pipe connection structure with a composite snap ring, which can solve the defects of the corrosion resistance of the existing galvanized carbon steel pipe connection structure due to the damage of the galvanized layer, and can improve the assembly efficiency. And prevent the installation location from being in the wrong order.

It is still another object of the present invention to provide a metal pipe joint structure having a composite snap ring capable of preventing damage to the seal ring during insertion of the metal pipe member into the joint structure.

The invention provides a metal pipe connection structure with a composite snap ring, comprising: a snap ring type pipe having at least a sealing groove and a snap ring groove on an inner circumferential surface of the socket end, wherein the snap ring groove is located in the seal An axially outer side of the groove; a seal ring disposed in the seal groove; and a composite snap ring including an annular metal snap ring piece having a notch and at least one annular ring, the annular ring and the ring The metal snap ring piece is coaxially arranged and integrated, and is disposed in the snap ring groove, wherein when the metal pipe is inserted into the socket of the snap ring type pipe fitting, the sealing groove and the card of the snap ring type pipe are pressed by the crimping tool. The ring groove deforms the metal tube to deform correspondingly by the tightening deformation of the composite snap ring, thereby achieving a sealed connection between the metal tube snap ring tubes through the sealing ring and the composite snap ring.

In the above metal pipe connection structure with a composite snap ring, preferably, the annular ring is a guiding ring which is disposed on a side of the composite snap ring close to the sealing ring, and the inner diameter of the guiding ring is smaller than the inner diameter of the sealing ring And greater than the outer diameter of the metal tube. Further preferably, the guide ring is made of engineering plastic.

In the above metal pipe connection structure having a composite snap ring, preferably, the annular ring is an anti-seepage ring which is disposed on an axial outer side of the socket of the composite snap ring adjacent to the snap ring type pipe, the seepage prevention The diameter of the ring is smaller than the diameter of the metal snap ring piece and larger than the diameter of the metal tube, thereby achieving a seal between the snap ring tube and the metal tube from the axially outer side when the snap ring tube is pressed. Further preferably, the anti-seepage ring is made of engineering plastic.

In the above metal pipe connection structure having a composite snap ring, preferably, the annular ring includes a guide ring and an anti-seepage ring, and the guide ring is disposed on a side of the composite snap ring adjacent to the seal ring, The anti-seepage ring is disposed on the other side of the composite snap ring, and the diameter of the guide ring anti-seepage ring is smaller than the diameter of the metal snap ring piece and larger than the diameter of the metal pipe.

In the above metal pipe connection structure having a composite snap ring, preferably, the metal pipe is a galvanized pipe.

In the above metal pipe connection structure having a composite snap ring, preferably, the inner side of the metal snap ring piece has a toothed structure.

In the above metal pipe connection structure having a composite snap ring, preferably, the inner circumferential surface of the metal snap ring piece has a tapered surface.

In the above metal pipe connection structure having a composite snap ring, preferably, the width of the cross section of the seal ring is greater than the height. Further preferably, the elliptical cross section of the cross section of the sealing ring.

In the above metal pipe connection structure having a composite snap ring, preferably, at least the inner surface of the snap ring type pipe member has a high strength anticorrosive coating.

By the above structure, the present invention can be blocked by the sealing ring before the fluid penetrating between the snap ring type pipe member and the inserted metal pipe reaches the damaged portion of the galvanized layer, thereby preventing corrosion of the metal pipe, thereby improving the entire The life of the connection structure.

In addition, by the arrangement of the guide ring and/or the anti-seepage ring in the composite snap ring, the present invention can prevent damage to the seal ring during the insertion of the metal pipe member into the joint structure and/or prevent external moisture from infiltrating into the snap ring type pipe member. Damage to the part, thereby further protecting the metal tube from corrosion and increasing the life of the joint structure.

In addition, the snap ring structure, the guide ring and/or the anti-seepage ring can be assembled in place at one time by the composite snap ring structure, thereby improving assembly efficiency.

The method and device of the present invention will have other features and advantages, which will be apparent from the drawings and the following detailed description, or the accompanying drawings and The detailed description is set forth with the particular embodiments

DRAWINGS

1A is a schematic view showing a connection structure of a snap-in metal pipe fitting in the prior art.

Fig. 1B shows an enlarged view of a portion B of the snap-in metal pipe connecting structure of Fig. 1A.

2 is a half cross-sectional view showing the construction of a snap ring type pipe joint structure of a metal pipe having a composite snap ring of the present invention.

3 is a half cross-sectional view showing the metal pipe connection structure of the present invention having a composite snap ring, in which the inside of the snap ring pipe member has been mounted with a seal ring and a composite snap ring, but has not been assembled with the metal pipe.

4 is a cross-sectional view showing a metal pipe connection structure having a composite snap ring of the present invention, in which a seal ring and a composite snap ring have been installed inside the snap ring type pipe member, and a metal pipe is inserted and crimped and assembled.

Fig. 5 is an enlarged view showing a portion A of the metal pipe clasp type connection structure of Fig. 4.

Figure 6 shows a composite snap ring of the present invention, wherein the right side view is a cross-sectional view of the left side view, the composite snap ring being formed by combining a guide ring and a metal snap ring piece.

Fig. 7 shows a composite snap ring of the present invention, wherein the left side view is a cross-sectional view of the left side view, the composite snap ring being formed by combining a metal snap ring piece and an anti-seepage ring.

Figure 8 shows a composite snap ring of the present invention, wherein the right side view is a cross-sectional view of the left side view, the composite snap ring being formed by a combination of a guide ring, a metal snap ring piece and an anti-seepage ring.

It should be understood that the appended drawings are not necessarily to The specific design features of the present invention as disclosed herein, including, for example, the particular dimensions, orientation, positioning, and <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> will be determined in part by the particular application and use environment.

In the figures of the invention, reference numerals refer to the same or equivalent parts of the invention in the various figures throughout the drawings.

Detailed ways

Reference will now be made in detail to the particular embodiments of the invention, While the present invention has been described in connection with the exemplary embodiments, it is understood that this description is not intended to limit the invention to those exemplary embodiments. Rather, the invention is intended to cover various alternatives, modifications, and equivalents, and other embodiments, which are included within the spirit and scope of the invention as defined by the appended claims .

As shown in FIG. 2, the snap ring type pipe fitting 1 of the metal pipe connecting structure with a composite snap ring of the present invention has a socket at one end for inserting a desired metal pipe. The socket of the snap ring type pipe fitting 1 is provided with a seal groove 2 and a snap ring groove 3 in this order from the inside to the outside. The inner diameter of the seal groove 2 and the snap ring groove 3 is larger than the inner diameter of the other portions of the snap ring type pipe member 1 to accommodate the rubber seal ring and the snap ring. The snap ring type pipe fitting 1 shown in the drawing is integrally formed.

The snap ring tube 1 can be made of any suitable material, typically a metallic material, such as steel, to meet strength and extrusion deformation requirements. In order to satisfy the corrosion resistance to the transport fluid, it is preferred to use a corrosion-resistant metal material such as stainless steel, copper or the like. When a non-corrosive ordinary metal material is used, for example, carbon steel, a high-strength anticorrosive coating can be bonded to the metal substrate surface of the snap ring type pipe member 1. The composite pipe wall structure not only satisfies the requirements of corrosion resistance of ordinary metal materials, but also makes the sealing better by the fact that the wall thickness of the metal substrate can be made thinner and more easily deformed during compaction.

3 is a half cross-sectional view showing a metal pipe connection structure having a composite snap ring of the present invention. As shown in Fig. 3, the seal ring 4 and the composite snap ring 6 have been installed in the seal groove 2 and the snap ring groove 3 of the snap ring type pipe member 1, but have not been assembled with the metal pipe. 4 is a cross-sectional view showing a metal pipe connection structure having a composite snap ring of the present invention. Figure 5 shows an enlarged view of a portion A of the metal pipe connection structure of Figure 4 with a composite snap ring. As shown in FIG. 4 and FIG. 5, the sealing ring 4 and the composite snap ring 6 have been installed in the sealing groove 2 and the snap ring groove 3 of the snap ring type pipe fitting 1, and the metal pipe 7 is inserted and crimped and assembled. .

As shown in FIG. 3, FIG. 4 and FIG. 5, the composite snap ring 6 includes an annular metal snap ring piece 601 having a notch and at least one annular ring. The annular ring is coaxially disposed and combined with the metal snap ring piece 601. It is integrated and disposed in the snap ring groove 3.

As an embodiment, as shown in FIG. 6, the annular ring is a guiding ring 5 which is disposed on the side of the composite snap ring 6 close to the sealing ring 4. The inner diameter of the guiding ring 5 is smaller than the inner diameter of the sealing ring 4 and larger than the to-be-inserted. The outer diameter of the metal tube 7. Therefore, the composite snap ring is formed by combining the guide ring 5 and the metal snap ring 601. The arrangement of the guide ring 5 helps to guide the insertion of the inserted metal tube 7 to avoid damage or movement of the sealing ring 4, thereby better ensuring the sealing effect. For this reason, the inner diameter of the guide ring 5 is smaller than the inner diameter of the seal ring 4 and larger than the outer diameter of the metal pipe 7, thereby achieving a guiding effect on the insertion of the metal pipe 7.

The guide ring 5 can be made of any suitable material as long as it meets the requirements of strength toughness and corrosion resistance, and produces sufficient deformation under pressure without being damaged. It is preferably made of engineering plastics such as polyethylene or the like.

As another embodiment, as shown in FIG. 7, the annular ring is an anti-seepage ring 8, which is disposed on the axially outer side of the socket of the composite snap ring 6 near the snap ring type tubular member 1. Therefore, the composite snap ring is formed by combining a metal snap ring piece 601 and an anti-seepage ring 8. The diameter of the anti-seepage ring 8 is smaller than the diameter of the metal snap ring piece 601 and slightly larger than the diameter of the metal pipe 7, and is also smaller than the diameter of the sealing ring 4, so that the card is realized from the axially outer side when the snap ring type pipe member 1 is pressed. The seal between the annular tube 1 and the metal tube 7 helps to guide the insertion of the inserted metal tube 7 to avoid damage or movement of the sealing ring 4.

The anti-seepage ring 8 can be made of any suitable material as long as it can satisfy the strength toughness and corrosion resistance requirements, and produces sufficient deformation under pressure without being damaged. It is preferably made of engineering plastics such as polyethylene or the like.

As still another embodiment, as shown in FIG. 8, the annular ring includes a guide ring 5 and an anti-seepage ring 8, and the guide ring 5 is disposed on a side of the composite snap ring 6 near the seal ring 4, The anti-seepage ring 8 is disposed on the other side of the composite snap ring 6, and the diameter of the guide ring 5 is smaller than the diameter of the metal snap ring piece 601 and larger than the diameter of the metal pipe 7. Therefore, the composite snap ring 6 composite snap ring is formed by combining the guide ring 5, the metal snap ring piece 601 and the anti-seepage ring 8. Also preferably, both the guide ring 5 and the anti-seepage ring 8 can be made of engineering plastics such as polyethylene or the like.

It should be noted that although the composite snap ring 6 in FIG. 6 does not have the anti-seepage ring 8, a separate anti-seepage ring 8 is used in combination with the composite snap ring 6 of FIG. 6 to prevent external fluid penetration, as needed. This is also allowed. Although the composite snap ring 6 of Fig. 7 does not have the guide ring 5, it is also permissible to use a separate guide ring 5 in combination with the composite snap ring 6 of Fig. 7 to enhance the guiding action as needed.

The sealing ring 4 preferably adopts a relatively flat structure, that is, a cross section having a width larger than the height to increase the contact area with the sealed tubular member, thereby improving the sealing effect. For example, a rectangular cross section or an elliptical cross section, or other suitable shape cross section.

The metal snap ring 601 has an annular shape with a notch to reduce the inner diameter when subjected to radial compression. The metal snap ring 601 can take a variety of forms. As an example, Figures 6, 7, and 8 show both ring-shaped metal snap ring pieces.

As a preferred embodiment, the inner peripheral surface of the metal snap ring piece may be distributed with a toothed structure (not shown). This toothed structure helps to be inserted into the metal tube when subjected to radial compression to increase the tensile strength.

The right side views of Figs. 6, 7, and 8 are each a cross-sectional view of the left side view. The right side view of Fig. 7 shows that the inner circumferential surface of the metal snap ring piece 601 has a tapered surface. Of course, this is only an exemplary cross section, which can also take the form of a rectangular cross section. When subjected to radial compression, the engagement of the tapered structure with the deformed metal tube provides axial pressure to further compress the rubber seal, thereby providing a better sealing effect.

The metal pipe connection structure with the composite snap ring shown in Fig. 4 is assembled as such. First, the metal pipe 7 is inserted into the socket of the snap ring type pipe fitting 1 in which the sealing ring 4 and the composite snap ring 6 have been mounted as shown in FIG. 3, and then the sealing groove 2 on the snap ring type pipe fitting 1 is pressed using a pressing tool. Simultaneous compression with the snap ring groove 3 to a predetermined size. At this time, the circumferential compression of the sealing groove 2 forces the inner sealing ring 4 to abut against the metal pipe 8 to form a one-side seal, which prevents fluid leakage in the pipe and satisfies the sealing requirements. At the same time, the snap ring groove 3 is circumferentially compressed, forcing the metal snap ring 601 of the inner composite snap ring 6 to be tightly embedded in the metal tube 7 to form a compression groove embedded in the metal tube, which satisfies the pipe pull-out performance. When the composite snap ring 6 is provided with the guide ring 5, the guide ring 5 is also simultaneously compressed inwardly on the circumference so as to abut against the outer surface of the metal tube 7 and the inner surface of the snap ring tube 1 to form a further seal. When the composite snap ring 6 is provided with the anti-seepage ring 8, the anti-seepage ring 8 is also simultaneously compressed inwardly on the circumference, thereby adhering to the outer surface of the metal pipe 7 and the inner surface of the snap-in tubular member 1 to form a further seal. .

The test data shows that the pull-out force of the snap ring connection of the same specification is 2.2 times or more of the pull-out force of the snap-fit connection. The modified pull-up force of the snap-on connection is the same specification. More than 4 times the pull resistance.

As can be seen from Fig. 4, the metal pipe connection structure having the composite snap ring is only compressed and deformed in the seal groove 2 and the snap ring groove 3 (in the same region) on the snap ring type pipe member 1, and the other portions are not deformed.

As can be seen from FIG. 5, although the metal snap ring 601 of the composite snap ring 6 is tightly embedded in the metal tube 7, the galvanized layer of the outer wall of the galvanized steel pipe is broken, but penetrates into the snap ring type pipe member 1 and the inserted metal pipe. The water flow between 7 is blocked by the sealing ring 4 before reaching the damaged portion of the galvanized layer, so that the metal pipe 7 is not corroded. FIG. 5 also shows that although the metal snap ring 601 of the composite snap ring 6 is tightly embedded in the metal tube 7 and the galvanized layer of the outer wall of the galvanized steel pipe is broken, the anti-seepage ring 8 is in the socket of the snap-in tubular member 1. The axially outermost side forms a seal, and the external moisture does not penetrate into the inside of the snap ring type pipe member 1, and thus the metal pipe 7 is not corroded. In other words, the structure of the present invention allows the connected galvanized steel pipe to not deteriorate in service life due to destruction of the galvanized layer.

In addition, in the above assembly process, since the guide ring 5 and/or the anti-seepage ring 8 are integrally integrated in the composite snap ring 6, the installation step can be saved, and the installation is quickly and accurately performed, thereby improving the installation efficiency and the installation accuracy, and also Helps avoid possible installation order errors.

The foregoing description of the specific exemplary embodiments of the present invention has The description is not intended to be exhaustive or to limit the scope of the invention. The embodiments were chosen and described in order to explain the particular embodiments of the invention Choices and changes. The scope of the invention is intended to be defined by the appended claims and their equivalents.

Claims

A metal pipe connection structure with a composite snap ring, comprising:

The snap ring type pipe fitting (1) has at least a seal groove (2) and a snap ring groove (3) on the inner circumferential surface of the socket end, and the snap ring groove (3) is located at the axis of the seal groove (2) To the outside;

a sealing ring (4) disposed in the sealing groove (2);

a composite snap ring (6) comprising an annular metal snap ring piece (601) having a notch and at least one annular ring, the annular ring being coaxially disposed and combined with the metal snap ring piece (601) One body and set in the snap ring groove (3),

When the metal tube (7) is inserted into the socket of the snap ring type pipe fitting, the sealing groove (2) of the snap ring type pipe member (1) and the snap ring groove (3) are pressed by the crimping tool to deform, thereby passing The tightening deformation of the composite snap ring (6) causes the metal tube (7) to be deformed accordingly, thereby realizing the metal tube (7) between the snap ring type pipe fittings (1) through the sealing ring (4) and the composite snap ring (6) Sealed connection.
The metal pipe connection structure with a composite snap ring according to claim 1, wherein the annular ring is a guiding ring (5) disposed on the composite snap ring (6) adjacent to the sealing ring (4) On one side, the inner diameter of the guide ring (5) is smaller than the inner diameter of the seal ring (4) and larger than the outer diameter of the metal pipe (7).
A metal pipe connection structure with a composite snap ring according to claim 2, characterized in that the guide ring (5) is made of engineering plastic.
The metal pipe connection structure with a composite snap ring according to claim 1, wherein the annular ring is an anti-seepage ring (8) disposed on the snap ring type of the composite snap ring (6) ( 1) The axially outer side of the socket, the diameter of the anti-seepage ring (8) is smaller than the diameter of the metal snap ring piece (601) and slightly larger than the diameter of the metal pipe (7), so that the snap ring type pipe fitting (1) The seal between the snap ring tube (1) and the metal tube (7) is achieved from the axially outer side when pressed.
The metal pipe connection structure with a composite snap ring according to claim 4, characterized in that the anti-seepage ring (8) is made of engineering plastic.
The metal pipe connection structure with a composite snap ring according to claim 1, wherein the annular ring comprises a guiding ring (5) and an anti-seepage ring (8), and the guiding ring (5) is arranged On the side of the composite snap ring (6) adjacent to the seal ring (4), the anti-seepage ring (8) is disposed on the other side of the composite snap ring (6), the guide ring (5) having a smaller diameter than the metal card The diameter of the ring piece (601) is larger than the diameter of the metal tube (7).
The metal pipe connection structure with a composite snap ring according to claim 1, wherein the metal pipe (7) is a galvanized pipe.
The metal pipe joint structure with a composite snap ring according to claim 1, wherein an inner circumferential surface of the metal snap ring piece (601) has a toothed structure.
The metal pipe joint structure with a composite snap ring according to claim 1, wherein an inner circumferential surface of the metal snap ring piece (601) has a tapered surface.
A metal pipe joint structure having a composite snap ring according to any one of claims 1 to 9, wherein at least an inner surface of the snap ring type pipe member (1) has a high-strength anticorrosive coating.