CN108386628B - Pipe fitting connecting structure - Google Patents
Pipe fitting connecting structure Download PDFInfo
- Publication number
- CN108386628B CN108386628B CN201810399801.8A CN201810399801A CN108386628B CN 108386628 B CN108386628 B CN 108386628B CN 201810399801 A CN201810399801 A CN 201810399801A CN 108386628 B CN108386628 B CN 108386628B
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- Prior art keywords
- sealing
- wall
- pipe fitting
- sealing element
- pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
- F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joints With Sleeves (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention relates to a pipe fitting connecting structure, which comprises a first pipe fitting provided with an inserting end; be provided with the second pipe fitting of accepting the end, accept the end cover and locate the outside of inserting the end, its characterized in that: follow the periphery wall of insertion end is provided with bellied spacing portion, accept to serve and be provided with the let insertion end male flaring portion, flaring portion warp the laminating form on the surface of spacing portion with the screens portion of spacing portion rigid coupling, be provided with the elastic sealing element of roughly tube-shape between the outer wall of insertion end and the inner wall of accepting the end, just sealing element's a pot head is located the port part of insertion end, sealing element's the other end is followed the inner wall of accepting the end and is towards keeping away from the direction extension of the port of insertion end. The pipe fitting connecting structure is convenient to install on site, and does not influence flow and pressure bearing capacity.
Description
Technical Field
The invention relates to the field of pipe fitting connection, in particular to a pipe fitting connection structure.
Background
At present, pipes are needed for conveying fluids such as gas, liquid and the like, and a plurality of pipes are often needed to be connected for long-distance conveying, wherein crimping is a common connecting mode in the prior art. The pipe fitting connection in the prior art usually adopts a mode of direct operation on an installation site, the used tool is usually an opposite-top clamping and pressing die which is composed of an upper die and a lower die, the pipe fitting is inserted into a bellmouth pipe fitting to a positioning step position during installation, a special clamping and pressing tool is used for simultaneously extruding clamping and pressing parts at one side or two sides of a U-shaped groove and the U-shaped groove, a rubber sealing ring is extruded to play a sealing role, the pipe fitting and the bellmouth pipe fitting at the clamping and pressing parts are simultaneously contracted and deformed to form a clamping and pressing structure with a hexagonal or circular cross section and a positioning and fixing role, and the hexagonal structure can be referred to the invention patent of CN1217771A, namely a method and a device for manufacturing a pipe extrusion connector; the circular structure can be referred to in the utility model patent "stainless steel pipe ring press connection structure and clamp-press type pipe fitting ring press mold" with the publication number of CN 201827546U.
Therefore, in order to realize that the connecting part of the pipe fitting and the connecting pipe has good sealing performance and better anti-drawing performance, the clamping and pressing part is deformed to cause diameter reduction, the caliber of the clamping and pressing part is only about 80% of the original caliber, and the flow of fluid in the clamping and pressing part can be greatly influenced; in addition, the pipe fitting and the connecting pipe are required to deform by about 20%, the larger the caliber is, the larger the required pressure is, the larger and heavier the corresponding clamping and pressing tool is, and the clamping and pressing tool is inconvenient to move and use, so that the caliber of the pipe fitting connected by the mode is generally below 50mm, and the pipe fitting can not be suitable for more occasions.
The press-fit ring joint is particularly important in the installation of stainless steel pipe fittings. Whether the crimping die is in place or not, whether the die is abraded and deformed and other factors directly influence the sealing performance and the drawing resistance of the stainless steel pipe fitting. The sealing performance is not in place, the pipe fitting is easy to leak, the anti-pulling performance is not in place, and the pipe fitting is pulled off under the increase of water pressure in the pipeline when the pipe fitting is subjected to the final acceptance water pressure test, so that water leakage is generated finally.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pipe fitting connecting structure which is convenient to install on site, does not influence flow and has good pressure bearing capacity aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pipe connecting structure comprises a first pipe provided with an inserting end; be provided with the second pipe fitting of accepting the end, accept the end cover and locate the outside of inserting the end, its characterized in that: follow the periphery wall of insertion end is provided with bellied spacing portion, it is provided with to accept to serve be provided with let insertion end male flaring portion, flaring portion warp laminate in form on the surface of spacing portion with the screens portion of spacing portion rigid coupling, be provided with the elastic sealing element of roughly tube-shape between the outer wall of insertion end and the inner wall of accepting the end, just sealing element's a pot head is located the port part of insertion end, sealing element's the other end is followed the inner wall of accepting the end and is towards keeping away from the direction extension of the port of insertion end.
Further, the longitudinal cross-sectional shape of the stopper portion is a peak shape having a high middle and low sides. The limiting part with the shape has good limiting effect and is convenient to manufacture.
Further, sealing element includes sealing substrate and sealing lip, sealing substrate is the tube-shape and outside wall and the inner wall of accepting the end is laminated mutually, sealing lip extends to the outer wall of inserting the end from sealing substrate's inside wall, makes sealing lip encircles and the laminating is sealed the outer wall of inserting the end, just sealing lip is close to sealing substrate's the wall with the contained angle between sealing substrate's the inside wall is the acute angle. When the sealing element is used, the outer wall of the insertion end a applies extrusion force to one side of the sealing lip towards the sealing substrate, and meanwhile, the sealing lip has the tendency of recovering the original shape, so that the sealing lip and the sealing lip are attached more tightly; in addition, when fluid such as water or gas flows in the sealing element, impact exists on one side of the sealing lip close to the sealing base, the sealing lip is further driven to be tightly attached to the outer wall of the insertion end, and sealing is further performed, so that the sealing element 3 can have good sealing effect after the pressure change exceeds 60%, and the common cylindrical sealing element in the prior art fails after the pressure change exceeds 50%, and leakage occurs.
Furthermore, the two ends of the second pipe fitting are provided with the bearing ends, the sealing element is arranged in the middle of the second pipe fitting and comprises the sealing substrate and two sealing lips arranged at the two ends of the sealing substrate. The second pipe fitting of this kind of structure simple structure and leakproofness are good.
Further, each bearing end of the second pipe fitting is provided with one first pipe fitting, and a gap is reserved between the opposite ports of the two first pipe fittings. The setting in clearance makes the fluid in the pipe fitting can flow into the sealing washer, strengthens the leakproofness and makes fluidic circulation more smooth and easy.
Preferably, the length of the gap is 2-4 mm. Such a length of the gap is more advantageous for the sealing of the sealing element.
Preferably, the axial length s of the sealing lip is in relation to the axial length L of the sealing element in a relationship of 0.2 L.ltoreq.s < 0.5L. The sealing effect of the sealing lip with the length relation is better.
Preferably, the included angle is 30-60 degrees. The sealing effect of the sealing lip in the included angle range is better.
Preferably, the height h of the limiting part relative to the highest position of the outer peripheral wall protrusion of the insertion end is 3-5 mm. The spacing effect of this kind of spacing portion of height is better.
Compared with the prior art, the invention has the advantages that the matching of the limiting part and the clamping part ensures that the pulling resistance and the pressure bearing capacity of the pipe fitting connecting structure are better, the pressure resistance of a steel pipe of DN65 shown in figure 5 can reach 6MPa, and the pressure can be maintained for more than 30 min; the clamping part only needs to be bent and deformed by the flaring part and matched with the limiting part, the contraction and deformation of the pipeline are not needed, the required installation pressure is small, only an installation tool with a small volume is needed to be carried during field installation (the clamping and pressing tool with larger pressure has larger volume), the installation is convenient and quick, by using the pipe fitting connecting structure, a steel pipe with the caliber of 100mm can use a clamping and pressing tool with the caliber of less than 32 kilonewtons, and a steel pipe with the caliber of 50mm in the prior art needs a clamping and pressing tool with the caliber of more than 40 kilonewtons; the pipe fitting connection mode does not need reducing, steel pipes with the same caliber are used, and the flow rate is larger than that of the reducing connection mode in the prior art; and placing the sealing element in this position results in a better sealing effect.
Drawings
Fig. 1 is a schematic structural view of a pipe connection structure according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a pipe connection structure according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a second tube according to an embodiment of the invention;
FIG. 4 is a schematic view of a pipe fitting before being clamped and pressed according to an embodiment of the present invention;
fig. 5 shows data of the withstand voltage test.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
As shown in fig. 1 to 5, the pipe connection structure includes a first pipe 1 provided with an insertion end a; the second pipe fitting 2 is provided with a bearing end b, the bearing end b is sleeved outside the insertion end a, a raised limiting portion 11 is arranged along the peripheral wall of the insertion end a, an expanding portion c for inserting the insertion end a is arranged on the bearing end b, the expanding portion c deforms and is attached to the outer surface of the limiting portion 11 to form a clamping portion 21 fixedly connected with the limiting portion 11, a substantially cylindrical sealing element 3 is arranged between the outer wall of the insertion end a and the inner wall of the bearing end b, one end of the sealing element 3 is sleeved on the port portion of the insertion end a, and the other end of the sealing element 3 extends in the direction of the inner wall of the bearing end b facing the port far away from the insertion end a. The shape of the longitudinal section of the limiting part 11 is a mountain peak shape with a high middle and two low sides, which is convenient for manufacturing, and other shapes of the limiting part 11 can be selected as long as the first pipe fitting 1 and the second pipe fitting 2 are firmly connected with each other and are not easy to move relatively. The height h of the highest position of the limiting part 11 protruding relative to the outer peripheral wall of the insertion end a is 3-5 mm, and h of the embodiment is 3.5 mm.
The sealing element 3 comprises a sealing substrate 31 and a sealing lip 32, wherein the sealing substrate 31 is cylindrical, the outer side wall surface of the sealing substrate 31 is attached to the inner wall of the receiving end b, the sealing lip 32 extends from the inner side wall of the sealing substrate 31 to the outer wall of the inserting end a, so that the sealing lip 32 surrounds and is attached to the outer wall of the sealing inserting end a, an included angle alpha between the wall surface of the sealing lip 32 close to the sealing substrate 31 side and the inner side wall of the sealing substrate 31 is an acute angle, the angle range of the included angle alpha is preferably 30-60 degrees, and the included angle alpha in the embodiment is 45 degrees. The sealing element with the structure of the embodiment is made of elastic materials, generally rubber, when in use, the outer wall of the insertion end a has extrusion force towards one side of the sealing substrate 31 to the sealing lip 32, and meanwhile, the sealing lip 32 has the tendency of recovering the original shape, so that the sealing lip 32 and the sealing lip are attached tightly; in addition, when a fluid such as water or gas flows in the sealing element, an impact is applied to the side of the sealing lip 32 close to the sealing base 31, and the sealing lip 32 is further driven to be attached to the outer wall of the insertion end a to further perform sealing, so that the sealing element 3 can have good sealing effect after the pressure change exceeds 60%, while the common cylindrical sealing element in the prior art fails after the pressure change exceeds 50%, and leakage occurs.
The first pipe element 1 can have a plurality of insertion ends a and the second pipe element 2 can also have a plurality of receiving ends b and can be adapted to the respective sealing element 3. The two ends of the first pipe fitting 1 of this embodiment are provided with insertion ends a, the second pipe fitting 2 is straight pipe-shaped, the two ends of the second pipe fitting 2 are provided with receiving ends b, the sealing element 3 is arranged in a groove which is located in the middle of the second pipe fitting 2 and is matched with the shape of the sealing element 3, and the sealing element 3 comprises a sealing substrate 31 and two sealing lips 32 arranged at the two ends of the sealing substrate 31. Each bearing end b of the second pipe fitting 2 of the present embodiment is provided with one first pipe fitting 1, and a gap d is formed between the opposite ends of the two first pipe fittings 1, the length of the gap d is 2-4 mm, and the length of the gap d is 3 mm. The axial length s of the seal lip 32 is in relation to the axial length L of the seal element 3, 0.2L ≦ s < 0.5L, 0.35L in the present embodiment.
When the pipe fitting connecting structure is used for connection on site, the flared part c of the bearing end shown in fig. 4 is pressed into a shape suitable for the clamping part 11 of the limiting part 11 by using a clamping and pressing tool, a steel pipe with the diameter of 100mm of the pipe fitting connecting structure can be pressed by using a clamping and pressing tool with the diameter of less than 32 kilonewtons, and the diameter of the steel pipe is not influenced after clamping and pressing; in the prior art, the clamping and pressing part is required to be contracted and deformed, so that a clamping and pressing tool of more than 40 kilonewtons is required for a steel pipe with the caliber of 50 mm. The pipe fitting using the pipe fitting connection structure of the invention is subjected to a pressure resistance test, the test data is shown in fig. 5, the pressure resistance of a steel pipe using DN65 can reach 6MPa, and the pressure can be maintained for more than 30 min.
Claims (6)
1. A pipe connection structure comprises a first pipe (1) provided with an insertion end (a); be provided with second pipe fitting (2) of accepting end (b), accept end (b) cover and locate the outside of inserting end (a), its characterized in that: a raised limiting part (11) is arranged along the peripheral wall of the insertion end (a), and the longitudinal section of the limiting part (11) is in a peak shape with a high middle and low two sides; the bearing end (b) is provided with a flaring part (c) for inserting the inserting end (a), the flaring part (c) is deformed and attached to the outer surface of the limiting part (11) to form a clamping part (21) fixedly connected with the limiting part (11), a roughly cylindrical elastic sealing element (3) is arranged between the outer wall of the inserting end (a) and the inner wall of the bearing end (b), one end of the sealing element (3) is sleeved on the port part of the inserting end (a), and the other end of the sealing element (3) extends in the direction of facing away from the port of the inserting end (a) along the inner wall of the bearing end (b); the sealing element (3) comprises a sealing substrate (31) and a sealing lip (32), wherein the sealing substrate (31) is cylindrical, the outer side wall surface of the sealing substrate (31) is attached to the inner wall of the bearing end (b), the sealing lip (32) extends from the inner side wall of the sealing substrate (31) to the outer wall of the insertion end (a), so that the sealing lip (32) surrounds and is attached to and seals the outer wall of the insertion end (a), and the included angle (alpha) between the wall surface of the sealing lip (32) close to the sealing substrate (31) and the inner side wall of the sealing substrate (31) is an acute angle; each bearing end (b) of the second pipe fitting (2) is provided with one first pipe fitting (1), and a gap (d) is reserved between the opposite ports of the two first pipe fittings (1).
2. The pipe connecting structure according to claim 1, wherein: the two ends of the second pipe fitting (2) are provided with the bearing ends (b), the sealing element (3) is arranged in the middle of the second pipe fitting (2), and the sealing element (3) comprises a sealing base (31) and two sealing lips (32) arranged at the two ends of the sealing base (31).
3. The pipe connecting structure according to claim 1, wherein: the length of the gap (d) is 2-4 mm.
4. A tubular connecting structure according to claim 1, characterized in that the relation between the axial length s of the sealing lip (32) relative to the axial length L of the sealing element (3) is 0.2L ≦ s < 0.5L.
5. A tubular connecting structure according to claim 1, characterized in that the angle of the included angle (α) ranges from 30 to 60 °.
6. The pipe connecting structure according to any one of claims 1 to 5, wherein: the height h of the limiting part (11) relative to the highest position of the outer peripheral wall of the insertion end (a) in the protruding mode is 3-5 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810399801.8A CN108386628B (en) | 2018-04-28 | 2018-04-28 | Pipe fitting connecting structure |
| PCT/CN2018/000241 WO2019204951A1 (en) | 2018-04-28 | 2018-07-04 | Pipe connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810399801.8A CN108386628B (en) | 2018-04-28 | 2018-04-28 | Pipe fitting connecting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108386628A CN108386628A (en) | 2018-08-10 |
| CN108386628B true CN108386628B (en) | 2020-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810399801.8A Active CN108386628B (en) | 2018-04-28 | 2018-04-28 | Pipe fitting connecting structure |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108386628B (en) |
| WO (1) | WO2019204951A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386628B (en) * | 2018-04-28 | 2020-01-21 | 浙江康帕斯流体输送技术有限公司 | Pipe fitting connecting structure |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3732882B2 (en) * | 1996-03-21 | 2006-01-11 | カルソニックカンセイ株式会社 | Tube connection structure |
| JP2012172825A (en) * | 2011-02-24 | 2012-09-10 | Nitta Corp | Connection structure of resin tube |
| CN202646962U (en) * | 2012-05-02 | 2013-01-02 | 卜莹 | Ring-pressure strengthening type thin-wall metal pipe connection body |
| GB2539972B (en) * | 2015-07-24 | 2017-07-19 | Hydra-Ring Ltd | A connector |
| CN205716120U (en) * | 2016-04-07 | 2016-11-23 | 大连凯斯博格设备制造有限公司 | A kind of assembling pipe joint with Simple sealing circle |
| CN206145309U (en) * | 2016-10-25 | 2017-05-03 | 安耐特流体输送科技有限公司 | Pipe connection quick -assembly structure |
| CN108386628B (en) * | 2018-04-28 | 2020-01-21 | 浙江康帕斯流体输送技术有限公司 | Pipe fitting connecting structure |
| CN208107367U (en) * | 2018-04-28 | 2018-11-16 | 浙江康帕斯流体输送技术有限公司 | A kind of pipe fitting joint structure |
-
2018
- 2018-04-28 CN CN201810399801.8A patent/CN108386628B/en active Active
- 2018-07-04 WO PCT/CN2018/000241 patent/WO2019204951A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019204951A1 (en) | 2019-10-31 |
| CN108386628A (en) | 2018-08-10 |
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Address after: A10, Plant 5 #, No. 96, Hibiscus Road, High tech Zone, Ningbo, Zhejiang 315800 Patentee after: ZHEJIANG KANGPASI FLUID TECHNIQUE Co.,Ltd. Address before: 315040 Gate 5, No. 1 Workshop, No. 96, Hibiscus Road, High tech Zone, Ningbo, Zhejiang Patentee before: ZHEJIANG COMPRESSED FLUID TRANSMISSION ENGINEERING Co.,Ltd. |
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