WO2019204951A1

WO2019204951A1 - Pipe connecting structure

Info

Publication number: WO2019204951A1
Application number: PCT/CN2018/000241
Authority: WO
Inventors: 龚岳强
Original assignee: 浙江康帕斯流体输送技术有限公司
Priority date: 2018-04-28
Filing date: 2018-07-04
Publication date: 2019-10-31
Also published as: CN108386628B; CN108386628A

Abstract

A pipe connecting structure, comprising: a first pipe (1) provide with an insertion end (a); and a second pipe (2) provided with a socket end (b). The socket end (b) sheaths outside the insertion end (a); a projecting limiting part (11) is provided along the outer circumferential wall of the insertion end (a); a flaring part (c) for the insertion end (a) to insert in is provided on the socket end (b); the flaring part (c) is deformed to be fitted onto the outer surface of the limiting part (11) to form a detent part (21) fixedly connected to the limiting part (11); an elastic sealing element (3), which is substantially in a shape of a tubular, is provided between the outer wall of the insertion end (a) and the inner war of the socket end (b); one end of the sealing element (3) sheaths the port portion of the insertion end (a), and the other end of the sealing element extends along the inner wall surface of the socket end (b) to a direction away from the port of the insertion end (a).

Description

Pipe joint structure

Technical field

The invention relates to the field of pipe joints, and in particular to a pipe joint structure.

Background technique

At present, the transportation of fluids such as gas and liquid requires the use of pipe fittings, and the long-distance transportation often requires connecting a plurality of pipe members. Among them, crimping is a commonly used connection method in the prior art. The pipe connection in the prior art is usually directly operated by the installation site. The tools used are usually the top type clamping die, and the top type clamping die is composed of the upper die and the lower die, and the pipe fitting is inserted into the socket pipe fitting during installation. Positioning the step position, using a special clamping tool to simultaneously press the pressing parts of the U-shaped groove and the U-shaped groove on one side or both sides, the rubber sealing ring is pressed and sealed, and the pipe fittings at the pressing part and The socket tube is simultaneously contracted and deformed to form a hexagonal shape or a circular shape, and the structure of the hexagonal shape can be specifically referred to the invention patent No. CN1217771A, and a method for manufacturing a pipe extrusion joint. "Device"; the circular structure can refer to the utility model patent "Non-steel pipe ring pressure connection structure and compression type pipe ring compression mold" with the announcement number CN201827546U.

It can be seen that the foregoing connecting structure has good sealing property and good pull-out resistance in order to realize the connection portion between the pipe member and the connecting pipe, and the deformation occurs in the pressing portion, and the diameter of the pressing portion is only original. About 80% will greatly affect the flow of the fluid. In addition, since both the pipe and the connecting pipe need to be deformed by nearly 20%, the larger the diameter, the greater the pressure required, and the corresponding pressing tools will become larger and bulkier. It is inconvenient to move and use such a pressing tool, so that the diameter of the pipe fittings connected by this method is generally less than 50 mm, and it is not suitable for more occasions.

The crimping of the stainless steel pipe fittings is particularly important. Whether the crimping die is pressed into place, whether the die is worn and deformed, etc., directly affects the sealing performance and the pull-out resistance of the stainless steel pipe fittings. The sealing performance is not in place, the pipe fittings are prone to leakage, and the pull-out performance is not in place. When the pipe fittings are tested for water pressure at the final acceptance, they are pulled out due to the increase of water pressure in the pipe, and finally water leakage occurs.

Summary of the invention

The technical problem to be solved by the present invention is to provide a pipe joint connection structure which is convenient for on-site installation, does not affect flow rate and has good pressure bearing capability, in view of the current state of the art.

The technical solution adopted by the present invention to solve the above technical problem is: a pipe joint structure comprising a first pipe member provided with an insertion end; a second pipe member provided with a receiving end, the receiving end being sleeved on the outer side of the insertion end a peripheral portion of the insertion end is provided with a convex limiting portion, and the receiving end is provided with a flared portion on the receiving end for inserting the insertion end, The flared portion is deformed and attached to the outer surface of the limiting portion to form a latching portion fixed to the limiting portion, and a substantially cylindrical portion is disposed between the outer wall of the inserting end and the inner wall of the receiving end An elastic sealing member, and one end of the sealing member is sleeved at a port portion of the insertion end, and the other end of the sealing member extends in a direction of an inner wall of the receiving end facing a port away from the insertion end.

Further, the longitudinal cross-sectional shape of the limiting portion is a mountain-like shape with a low height on both sides in the middle. The limiting portion of the shape has a good limiting effect and is easy to manufacture.

Further, the sealing member includes a sealing base and a sealing lip, the sealing base is cylindrical and the outer side wall surface is in contact with the inner wall of the receiving end, and the sealing lip extends from the inner side wall of the sealing base toward the outer wall of the insertion end, so that The sealing lip surrounds and conforms to the outer wall of the insertion end, and an angle between the wall surface of the sealing lip adjacent to the sealing substrate side and the inner side wall of the sealing substrate is an acute angle. When the sealing element is in use, the outer wall of the insertion end a has a pressing force on the sealing lip to the side of the sealing base, and the sealing lip has a tendency to return to the original state, so that the fit between them is more tight; When a fluid such as gas flows therein, there is an impact on the side of the sealing lip close to the sealing substrate, further driving the sealing lip against the outer wall of the insertion end to further seal, so that the sealing element 3 is more than 60% after the pressure change It can also have a good sealing effect, and the conventional cylindrical seal in the prior art will fail after more than 50% of the pressure change, and leakage will occur.

Further, both ends of the second pipe member are provided with the receiving end, the sealing member is disposed at a middle portion of the second pipe member, and the sealing member comprises the sealing substrate and two disposed at two ends of the sealing substrate Sealing lips. The second pipe of the structure has a simple structure and good sealing performance.

Further, each of the receiving ends of the second tubular member is provided with a first tubular member, and a gap is formed between the opposite ports of the two first tubular members. The gap is arranged such that fluid within the tube can flow into the seal, enhancing the seal and making the fluid flow more smoothly.

Preferably, the gap has a length of 2 to 4 mm. This length of clearance is more conducive to the sealing of the sealing element.

Preferably, the relationship between the axial length s of the sealing lip and the axial length L of the sealing member is 0.2 L ≤ s < 0.5 L. This length-dependent sealing lip has a better sealing effect.

Preferably, the angle of the included angle ranges from 30 to 60 degrees. This sealing angle of the sealing lip is better.

Preferably, the height h of the position of the limiting portion with respect to the highest position of the outer peripheral wall of the insertion end is 3 to 5 mm. This height limit is better for the limit.

Compared with the prior art, the invention has the advantages that the cooperation of the limiting portion and the latching portion makes the pull-out performance and the pressure-bearing capacity of the tubular connecting structure better, and the pressure resistance of the steel pipe of DN65 is shown in FIG. It can reach 6MPa, and can hold pressure for more than 30min; and the type of the card portion only needs to be bent and deformed to fit the limit portion, and the shrinkage deformation of the pipe is not required, and the required installation pressure is small. In the field installation, only need to carry a small installation tool (the larger the pressure, the larger the pressure tool), the installation is convenient and fast, and the pipe connection structure is used. The 100mm diameter steel pipe uses 32 kN or less. The pressing tool can be used, and the prior art 50mm diameter steel pipe requires a clamping tool of 40 kN or more; the pipe connecting method does not need to reduce the diameter, and the steel pipe of the same diameter is used, and the flow rate is larger than that of the prior art. Connection method; and the sealing element is placed at this position for better sealing effect.

DRAWINGS

1 is a schematic structural view of a pipe joint connection structure according to an embodiment of the present invention;

2 is a cross-sectional view showing a pipe joint connection structure according to an embodiment of the present invention;

Figure 3 is an enlarged schematic view of a portion A of Figure 2;

4 is a schematic cross-sectional view showing a second pipe member according to an embodiment of the present invention;

FIG. 5 is a schematic view of a pipe member before clamping according to an embodiment of the present invention; FIG.

Figure 6 is an enlarged schematic view of a portion B of Figure 5;

Figure 7 shows the data of the withstand voltage test.

detailed description

The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments.

As shown in Figures 1 to 7, the pipe connecting structure comprises a first pipe member 1 provided with an insertion end a; a second pipe member 2 provided with a receiving end b, the receiving end b being sleeved on the outside of the insertion end a a protruding limiting portion 11 is disposed along the outer peripheral wall of the insertion end a, and the receiving end b is provided with a flared portion c for inserting the insertion end a, and the flared portion c is deformed and attached to the a locking portion 21 fixed to the limiting portion 11 is formed on an outer surface of the limiting portion 11, and a substantially cylindrical sealing member 3 is disposed between an outer wall of the insertion end a and an inner wall of the receiving end b. And one end of the sealing member 3 is sleeved at the port portion of the insertion end a, and the other end of the sealing member 3 extends in a direction in which the inner wall of the receiving end b faces away from the port of the insertion end a. The longitudinal cross-sectional shape of the limiting portion 11 of the present embodiment is a mountain-like shape with a low height on both sides of the middle, and the shape is convenient for manufacturing, and other shape of the limiting portion 11 can be selected as long as the first tubular member 1 and The second pipe members 2 are firmly connected to each other and are not easily moved relative to each other. The height h of the highest position of the stopper portion 11 with respect to the outer peripheral wall of the insertion end a is 3 to 5 mm, and h = 3.5 mm in the present embodiment.

The sealing member 3 includes a sealing base 31 and a sealing lip 32. The sealing base 31 has a cylindrical shape and the outer side wall surface is in contact with the inner wall of the receiving end b. The sealing lip 32 extends from the inner side wall of the sealing base 31 toward the outer wall of the insertion end a. The sealing lip 32 is caused to surround and conform to the outer wall of the sealing insertion end a, and the angle α between the wall surface of the sealing lip 32 close to the sealing substrate 31 side and the inner side wall of the sealing base 31 is an acute angle, and the angle range of the angle α is preferably The angle α of the present embodiment is 45°, which is 30 to 60°. The structural sealing member of the present embodiment is made of a resilient material, generally rubber, and the outer wall of the insertion end a has a pressing force against the sealing lip 32 on the side of the sealing base 31, while the sealing lip 32 is sealed. There is a tendency to restore the original shape, so that the fit between them is more tight; in addition, when a fluid such as water or gas flows therein, there is an impact on the side of the sealing lip 32 close to the sealing base 31, further driving the sealing seat 32 to be tightly attached. The outer wall of the insertion end a is further sealed. Therefore, the sealing member 3 can have a good sealing effect after the pressure change exceeds 60%, and the conventional cylindrical seal is more than 50% in the prior art. After that, it will fail and a leak will occur.

The first tube 1 can have a plurality of insertion ends a, and the second tube 2 can also have a plurality of receiving ends b and match the respective sealing elements 3. The first tube member 1 of the embodiment is provided with an insertion end a at both ends thereof, the second tube member 2 is a straight tubular shape, and both ends of the second tube member 2 are provided with a receiving end b, and the sealing member 3 is disposed at the second tube member 2 In the groove of the middle portion which matches the shape of the sealing member 3, the sealing member 3 includes a sealing base 31 and two sealing lips 32 provided at both ends of the sealing substrate 31. Each of the receiving ends b of the second pipe member 2 of the present embodiment is provided with a first pipe member 1, and a gap d is formed between the opposite ports of the two first pipe members 1, and the length of the gap d is 2 to 4 mm. Example d = 3 mm. The relationship between the axial length s of the seal lip 32 with respect to the axial length L of the sealing member 3 is 0.2 L ≤ s < 0.5 L, and s = 0.35 L in the present embodiment.

When the pipe joint connection structure is used for connection in the field, it is only necessary to press the flared portion c of the receiving end as shown in FIGS. 5 and 6 into a shape suitable for the latch portion 11 of the limiting portion 11 by using a pressing tool. And the 100mm diameter steel pipe of the pipe connecting structure can be used with a clamping tool of 32 kN or less, and has no influence on the caliber after the pressing; whereas the prior art requires the pressing portion to perform the shrinkage deformation, 50 mm. Steel pipes require more than 40 kN of compression tools. The pipe fitting of the pipe connecting structure of the present invention is subjected to a withstand voltage test, and the test data is as shown in Fig. 5. The pressure resistance of the steel pipe using DN65 can reach 6 MPa, and the pressure can be maintained for more than 30 min.

Claims

A pipe joint structure comprising a first pipe member (1) provided with an insertion end (a); a second pipe member (2) provided with a receiving end (b), the receiving end (b) being sleeved on the An outer side of the insertion end (a), characterized in that: a peripheral limiting portion (11) is disposed along the outer peripheral wall of the insertion end (a), and the receiving end (b) is provided with the a flared portion (c) into which the insertion end (a) is inserted, and the flared portion (c) is deformed and attached to the outer surface of the limiting portion (11) to form a solid portion with the limiting portion (11) a latching portion (21), a substantially cylindrical elastic sealing member (3) disposed between the outer wall of the insertion end (a) and the inner wall of the receiving end (b), and the sealing member One end of (3) is sleeved on the port portion of the insertion end (a), and the other end of the sealing member (3) faces the port away from the insertion end (a) along the inner wall of the receiving end (b) The direction extends.
The pipe joint structure according to claim 1, characterized in that the longitudinal section of the limiting portion (11) has a mountain shape with a low height on both sides.
A pipe joint structure according to claim 1, wherein said sealing member (3) comprises a sealing base (31) and a sealing lip (32), said sealing substrate (31) being cylindrical and having an outer side wall surface and receiving The inner wall of the end (b) is fitted, and the sealing lip (32) extends from the inner side wall of the sealing base (31) toward the outer wall of the insertion end (a) such that the sealing lip (32) surrounds and fits the seal An outer wall of the insertion end (a), and an angle (α) between the wall surface of the sealing lip (32) near the sealing substrate (31) side and the inner side wall of the sealing substrate (31) is Sharp angle.
The pipe joint structure according to claim 3, wherein the second pipe member (2) is provided with the receiving end (b) at both ends, and the sealing member (3) is disposed on the second pipe member In the middle portion of (2), the sealing member (3) includes the sealing substrate (31) and two sealing lips (32) disposed at both ends of the sealing substrate (31).
The pipe joint structure according to claim 4, characterized in that each of the receiving ends (b) of the second pipe member (2) is provided with a first pipe member (1), and two first pipe members (1) There is a gap (d) between the opposite ports.
The pipe joint structure according to claim 5, wherein the gap (d) has a length of 2 to 4 mm.
The pipe joint structure according to claim 4, characterized in that the relationship between the axial length s of the seal lip (32) and the axial length L of the seal member (3) is 0.2 L ≤ s < 0.5 L.
The pipe joint structure according to claim 4, wherein the angle (α) is in the range of 30 to 60°.
The pipe connecting structure according to any one of claims 1 to 8, characterized in that the height h of the highest position of the limiting portion (11) with respect to the outer peripheral wall of the interposing end (a) It is 3 to 5 mm.