WO2019080894A1

WO2019080894A1 - Clamp ring type connection structure for metal pipe

Info

Publication number: WO2019080894A1
Application number: PCT/CN2018/111851
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: CN109707928A

Abstract

Disclosed is a clamp ring type connection structure for a metal pipe, the connection structure comprising: a clamp ring type pipe fitting (1), at least a sealing groove (2) and a clamp ring groove (3) being provided in an inner peripheral surface at a female end thereof, and the clamp ring groove (3) being located axially outside the sealing groove (2); a sealing ring (4) arranged in the sealed groove (2); a guide ring (5) arranged in the clamp ring groove (3) and located axially outside sealing ring (4), with the inner diameter of the guide ring (5) being less than that of the sealing ring (4) and being greater than the outer diameter of a metal pipe (7); and a metal clamp ring (6) being in a ring shape with a notch so as to be arranged in the clamp ring groove (3) and located axially outside the guide ring (5), wherein when the metal pipe (7) is inserted in place in the female end of the clamp ring type pipe fitting (1), the sealed groove (2) and the clamp ring groove (3) of the clamp ring type pipe fitting (1) are compressed to be deformed using a crimping tool, so as to deform the metal pipe by means of the tightening and deformation of the clamp ring, thereby realizing the sealed connection between the metal pipe and the clamp ring type pipe fitting by means of the sealing ring.

Description

Metal pipe snap ring connection structure

Technical field

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

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

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal pipe snap ring type connection structure which can solve the defects of corrosion resistance reduction in the existing galvanized carbon steel pipe connection structure.

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

The present invention provides a metal pipe snap ring type connecting structure, comprising: a snap ring type pipe member 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 sealing groove An axially outer side; a sealing ring disposed in the sealing groove; a guiding ring disposed in the snap ring groove and located axially outside the sealing ring, the inner diameter of the guiding ring being smaller than the inner diameter of the sealing ring and larger than the metal tube An outer diameter; and a metal snap ring having a notched annular shape disposed in the snap ring groove and located axially outward of the guide ring, wherein the pressure is utilized when the metal tube is inserted into the socket of the snap ring tube The connecting tool presses the sealing groove of the snap ring type pipe fitting and the snap ring groove to deform, so that the metal pipe is deformed correspondingly by the tightening deformation of the snap ring, thereby achieving the sealed connection between the metal pipe snap ring fittings through the sealing ring .

In the above metal pipe snap ring connection structure, preferably, a guide ring disposed in the snap ring groove and located between the seal ring and the snap ring may be further included, the inner diameter of the guide ring being smaller than the inner diameter of the seal ring and larger than the metal The outer diameter of the tube. Further preferably, the guide ring is made of polyethylene.

In the metal pipe snap ring connection structure described above, preferably, the anti-seepage ring disposed on the axially outer side of the snap ring is further included, so that the snap ring type pipe and the metal pipe are realized from the axially outer side when the snap ring type pipe member is pressed. The seal between. Further preferably, the anti-seepage ring is made of engineering plastic.

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

In the metal pipe clasp type connection structure described above, preferably, the inner side of the metal snap ring has a toothed structure.

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

In the above metal pipe snap ring connection structure, 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.

The invention also provides a metal pipe snap ring type connecting structure, comprising: a snap ring type pipe member, the bearing end is provided with a sealing groove and a snap ring groove; a sealing ring is disposed in the sealing groove; the snap ring, It has a ring-shaped annular shape so as to be disposed in the snap ring groove and facilitates compression deformation; and a guide ring disposed in the snap ring groove, the inner diameter of the guide ring being smaller than the inner diameter of the seal ring and larger than the outer diameter of the metal pipe When the metal tube is inserted into the socket of the snap ring type pipe fitting, the sealing groove and the snap ring groove of the snap ring type pipe are pressed by the crimping tool to deform, thereby achieving the sealed connection between the metal pipe snap ring type pipe fittings. .

The invention also provides a metal pipe snap ring connection structure, comprising: a snap ring type pipe member, the bearing end is provided with a sealing groove and a snap ring groove; a sealing ring is disposed in the sealing groove; the metal snap ring , which has an annular shape with a notch so as to be disposed in the snap ring groove and facilitate compression deformation; and an anti-seepage ring which is disposed at the outermost axial direction in the socket of the snap ring type pipe, the diameter of the anti-seepage ring is smaller than The diameter of the seal ring is slightly larger than the diameter of the metal tube, so that the seal between the snap ring tube and the metal tube is realized from the axially outer side when the snap ring tube is pressed.

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, the present invention can prevent damage to the seal ring during the insertion of the metal pipe member into the joint structure.

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 structure of a snap ring type pipe fitting of the metal pipe snap ring type connection structure of the present invention.

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

4 is a cross-sectional view showing the metal pipe snap ring connection structure of the present invention, in which the inside of the snap ring pipe member has been installed with a seal ring, a guide ring, a snap ring, an anti-seepage ring, and a metal pipe is inserted and carried out. Crimp assembly.

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

Fig. 6 shows a toroidal snap ring of the present invention, wherein the right side view is a cross-sectional view of the left side view.

Figure 7 shows a ring gear type snap ring of the present invention.

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 snap ring type connecting structure 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.

3 is a half cross-sectional view showing the metal pipe snap ring connection structure of the present invention. As shown in Fig. 3, the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 have been mounted 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.

Here, the guide ring 5 is not necessary. The guide ring 5 has a circular shape whose inner diameter is smaller than the inner diameter of the seal ring 4 and larger than the outer diameter of the metal pipe 7 to be inserted.

Fig. 4 is a cross-sectional view showing the metal pipe clasp type connection structure of the present invention. Fig. 5 is an enlarged view showing a portion A of the snap ring type metal pipe connecting structure of Fig. 4. As shown in FIG. 4 and FIG. 5, the sealing ring 4, the guiding ring 5, the snap ring 6 and the anti-seepage ring 8 are sequentially installed in the sealing groove 2 and the snap ring groove 3 of the snap ring type pipe fitting 1, and the metal is inserted. Tube 7 was crimped and assembled.

Here, the guide ring 5 has a metal tube 7 which helps to guide the insertion, avoiding damage or moving the sealing ring 4, thereby better ensuring the sealing effect. For this purpose, the inner diameter of the guide ring 5 is smaller than the inner diameter of the sealing ring 4 and larger than the outer diameter of the metal tube 7, thereby achieving a guiding effect on the insertion of the metal tube 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 preferred to use an engineering plastic such as polyethylene or the like.

The anti-seepage ring 8 is not required. The anti-seepage ring 8 has a circular shape and is disposed at the axially outermost side in the socket of the snap ring type pipe member 1. When the snap ring type pipe member 1 is pressed, the anti-seepage ring 8 and the metal pipe 7 are brought into close contact, and the seal is realized from the axially outer side, so that external moisture can be prevented from infiltrating into the snap ring type pipe member 1 to cause corrosion.

The diameter of the anti-seepage ring 8 can be set smaller than the diameter of the seal ring 4 and larger than the diameter of the metal pipe 7. At this time, the anti-seepage ring 8 can function as a guide ring (centering the inserted metal pipe 7 to avoid damage or moving the seal ring 4), whereby the guide ring 5 can be omitted.

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 preferred to use an engineering plastic such as polyethylene or the like.

Moreover, it should be noted that the arrangement order of the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 shown in the drawing is only a preferred fact. The basic function of the guide ring 5 is to guide the metal tube 7 to be inserted in the center to avoid damage or to move the sealing ring 4. The basic function of the anti-seepage ring 8 is to prevent external moisture from infiltrating into the snap ring tube 1 and causing corrosion. Other arrangements are also possible on request. For example, regardless of the order in which the other related components are arranged, the guide ring 5 is placed in the axial direction of the seal ring 4 in the socket of the snap ring type pipe member 1. For another example, regardless of the order in which the other related components are arranged, the seepage prevention ring 8 is disposed in the axially outermost side in the socket of the snap ring type tubular member 1.

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 snap ring 6 has an annular shape with a notch to reduce the inner diameter when subjected to radial compression. The snap ring 6 can take various forms. As an example, Figure 6 shows a toroidal snap ring.

The right side view of Fig. 6 is a cross-sectional view of the left side view. The right side view of Fig. 6 shows that the inner circumferential surface of the snap ring 6 has a tapered surface. Of course, this is only an exemplary cross section, which may also take the form of a rectangular cross section as shown in FIG. 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.

Fig. 7 shows a ring-shaped snap ring having a tooth-like structure distributed in the circumferential direction inside. This toothed structure helps to be inserted into the metal tube when subjected to radial compression to increase the tensile strength. Similarly, the inner peripheral surface structure of the tapered surface of the snap ring 6 shown in Fig. 7 can also be applied to the annular snap ring shown in Fig. 6.

The metal pipe snap ring connection structure shown in Fig. 4 is assembled as such. First, the metal pipe 7 is inserted into the socket of the snap ring pipe 1 in which the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 have been mounted as shown in Fig. 3, and then the retaining tool is used to the snap ring. The seal groove 2 and the snap ring groove 3 on the tubular member 1 are simultaneously compressed 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 inner snap ring 6 to be tightly inserted into the metal tube 7 to form a compression groove embedded in the metal tube, which satisfies the pipe pull-out performance. When the guide ring 5 is provided, 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 anti-seepage ring 8 is provided, the anti-seepage ring 8 is also simultaneously compressed inwardly on the circumference so as to be in close contact with 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 snap ring connection structure is only subjected to compression deformation of 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 snap ring 6 is tightly embedded in the metal tube 7 to cause the galvanized layer of the outer wall of the galvanized steel pipe to be broken, the water flow infiltrated between the snap ring type pipe member 1 and the inserted metal pipe 7 is reached. The damaged portion of the galvanized layer is blocked by the sealing ring 4, so that the metal tube 7 is not corroded. Figure 5 also shows that although the snap ring 6 is tightly embedded in the metal tube 7 to cause the galvanized layer of the outer wall of the galvanized steel pipe to be broken, the anti-seepage ring 8 forms a seal on the axially outermost side in the socket of the snap ring type pipe member 1. 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.

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 snap ring connection structure, 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 guiding ring (5) disposed in the snap ring groove (3) and located axially outside the sealing ring (4), the inner diameter of the guiding ring being smaller than the inner diameter of the sealing ring and larger than the outer diameter of the metal pipe (7); as well as

a metal snap ring (6) having a ring-shaped annular shape so as to be disposed in the snap ring groove (3) and located axially outside the guide ring (5),

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 snap ring causes the metal tube (7) to be deformed accordingly, whereby the sealing connection between the metal tube (7) snap-on tube (1) is achieved by the sealing ring (4).
The metal pipe clasp type connection structure according to claim 1, wherein the guide ring is made of engineering plastic.
The metal pipe clasp type connection structure according to claim 1, further comprising an anti-seepage ring (8) disposed axially outward of the metal clasp (6), thereby being clamped in the snap ring type (1) The sealing between the snap ring tube (1) and the metal tube (7) is achieved from the axially outer side when compacted.
The metal pipe clasp type connection structure according to claim 3, characterized in that the anti-seepage ring (8) is made of engineering plastic.
The metal pipe snap ring connection structure according to claim 1, characterized in that the metal pipe (7) is a galvanized pipe.
The metal pipe clasp type connection structure according to claim 1, wherein an inner circumferential surface of the metal snap ring (6) has a toothed structure.
The metal pipe clasp type connection structure according to claim 1, characterized in that the inner circumferential surface of the metal snap ring (6) has a tapered surface.
The metal pipe clasp type connection structure according to claim 1, characterized in that the width of the cross section of the sealing ring (4) is greater than the height.
A metal pipe snap ring connection structure, comprising:

a snap ring type pipe fitting (1), the bearing end is provided with a sealing groove (2) and a snap ring groove (3);

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

a metal snap ring (6) having a ring-shaped annular shape so as to be disposed in the snap ring groove (3) and to facilitate compression deformation;

a guiding ring (5) disposed in an axially outer side of the sealing ring (4) in the socket of the snap ring type tubular member (1), the inner diameter of the guiding ring being smaller than the inner diameter of the sealing ring and larger than the metal tube (7) The outer diameter, wherein when the metal tube (7) is inserted into the socket of the snap ring type pipe, 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 the same. Thereby achieving a sealed connection between the metal tube (7) snap ring fittings (1).
A metal pipe snap ring connection structure, comprising:

a snap ring type pipe fitting (1), the bearing end is provided with a sealing groove (2) and a snap ring groove (3);

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

a metal snap ring (6) having a ring-shaped annular shape so as to be disposed in the snap ring groove (3) and to facilitate compression deformation;

An anti-seepage ring (8), which is disposed at the outermost axial direction in the socket of the snap ring type pipe (1), the diameter of the anti-seepage ring (8) is smaller than the diameter of the seal ring (4) and slightly larger than the metal pipe ( 7) The diameter of the seal between the snap ring tube (1) and the metal tube (7) from the axially outer side when the snap ring tube (1) is compressed.