CN110778813A - Welding-free connecting pipe joint - Google Patents
Welding-free connecting pipe joint Download PDFInfo
- Publication number
- CN110778813A CN110778813A CN201911237187.6A CN201911237187A CN110778813A CN 110778813 A CN110778813 A CN 110778813A CN 201911237187 A CN201911237187 A CN 201911237187A CN 110778813 A CN110778813 A CN 110778813A
- Authority
- CN
- China
- Prior art keywords
- pipe
- flared
- coupling body
- tube
- positioning ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims abstract description 44
- 238000010168 coupling process Methods 0.000 claims abstract description 44
- 238000005859 coupling reaction Methods 0.000 claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 238000003780 insertion Methods 0.000 description 13
- 230000037431 insertion Effects 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 6
- 230000008093 supporting effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002640 oxygen therapy Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- F16L21/007—Joints with sleeve or socket clamped by a wedging action
-
- 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
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
- F16L13/16—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars
- F16L13/165—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars the pipe or collar being deformed by an axially movable sleeve
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention belongs to the technical field of metal pipe joints, and provides a welding-free connecting pipe joint which comprises a positioning ring and a welding-free connecting pipe joint, wherein the positioning ring is provided with an outer surface limited for a flared pipe; the first connecting body is formed by mechanically connecting the positioning ring and the flared tube; an inner nest having a tube defined for a straight cannula; the second coupling body is formed by mechanically connecting the inner nesting pipe and the straight inserting pipe; a third coupling body mechanically coupled by the second coupling body portion within the flare tube contained by the first coupling body portion; a snap ring having said flared tube outer surface defined for said third coupling body, and upon mechanical coupling of said third coupling body; the invention adopts the physical characteristics of the metal pipes and reasonably deforms and matches, thereby achieving the purpose of welding-free connection between the pipe fittings and saving the cost.
Description
Technical Field
The invention relates to the technical field of metal pipe joints, in particular to a welding-free connecting pipe joint.
Background
With the development of modern large industries, the pipeline fluid industry, particularly the refrigeration industry, the solar industry and even the hospital oxygen therapy bottle are widely applied to metal pipelines, at present, most of the construction site installation of the industries is copper pipes, but the copper resources are seriously short, the cost is higher, the sustainable development of social large production is not facilitated, China is a country with rich aluminum resources, and the aluminum resources with low production cost, abundance and low cost provide convenient conditions. Therefore, copper pipes and aluminum pipes are often connected together to be used as conveying pipelines in refrigeration industry, solar industry and even hospital oxygen bottle industry to form a circulating pipeline system, so that the production cost is reduced, and the copper pipes and the aluminum pipes are generally connected by copper-aluminum joints; a common copper-aluminum joint in the market is provided with a pipe joint structure connected with an aluminum pipe at the end, the pipe joint structure is generally conical, the conical pipe joint structure is inserted into the aluminum pipe, and the connection is carried out in an electric resistance welding mode; however, the conical pipe joint is too simple in structure, the welding quality of the copper aluminum joint and the aluminum pipe is unstable, the welding area is small, the corrosion resistance of the resistance welding mode is weak, and leakage is easy to occur; the second one is a product of German Lokring company, the structure of which is composed of a middle copper pipe part, two ends of which are two aluminum quick closing rings with different diameters, two ends of the middle copper pipe are provided with a closing end, the closing end is directly inserted into a pipeline and then is inserted into the closing end through the quick closing rings, and the pipeline and the copper pipe which are inserted into the closing end are consolidated; such connected mode, the benefit lies in can be through the fast throat that closes that is equipped with on ring sum copper pipe, with the abundant pressfitting of two pipe fittings, sealing performance is also fine, is used for air conditioner pipeline to connect more, perhaps on external pipeline, but such product uses in the market many, and the product leakproofness is good, but its product use material mainly is the copper product, and the cost consumes greatly, and processing technology is loaded down with trivial details, and the low price of efficiency is expensive.
Disclosure of Invention
In order to overcome the technical defects of the prior patents and the metal pipeline joints currently on the market, the inventor of the invention has conducted intensive research on the defects and completed the invention after paying a great deal of creative labor.
Specifically, the technical problems to be solved by the present invention are: the first physical characteristic that adopts metal tubular product, thereby the reasonable deformation cooperation reaches exempting from to weld between the pipe fitting and connects, and the problem that the big price is expensive of market metal pipe joint consumptive material volume at present is solved to the second, and the third guarantees that the product is connected the effect of back seal and is unanimous with market effect at present.
To achieve the above objects, a welding-free connection pipe joint includes,
a positioning ring having an outer surface defining a flared tube;
the first connecting body is formed by mechanically connecting the positioning ring and the flared tube;
an inner nest having a tube defined for a straight cannula;
the second coupling body is formed by mechanically connecting the inner nesting pipe and the straight inserting pipe;
a third coupling body mechanically coupled by the second coupling body portion within the flare tube contained by the first coupling body portion;
a snap ring having said flared tube outer surface defined for said third coupling body, and after said third coupling body is mechanically coupled.
In the invention, as a preferred technical scheme, the positioning ring is a flared ring and is provided with an original section and a positioning ring flared section, and the joint position of the original section and the positioning ring flared section is the positioning ring flared part.
In the invention, as a preferred technical scheme, the flaring part of the positioning ring is mechanically connected to the flaring part of the flaring pipe.
In the invention, as a preferable technical scheme, one end of the inner nest is provided with a clamping ring, and the outer diameter of the clamping ring is larger than the inner diameter of the flared pipe and smaller than the outer diameter of the flared pipe, or the outer diameter of the clamping ring is smaller than the inner diameter of the flared pipe.
In the invention, as a preferable technical scheme, the snap ring embedded and sleeved with the flare pipe is mechanically connected to the flaring opening of the flare pipe.
After the technical scheme is adopted, the invention has the beneficial effects that:
in the invention, as a preferred technical scheme, the positioning ring is a flared ring and is set as an original section and a positioning ring flared section, the joint position of the original section and the positioning ring flared section is a positioning ring flared section, the size of the inner diameter of the pipe orifice of the original section flared section is smaller than the size of the outer diameter of the flared pipe mechanically matched with the original section flared section, and the interference fit between the positioning ring and the flared pipe is further realized, so that the positioning ring applies load to the flared pipe when the positioning ring and the flared pipe are in interference fit, and the size of the flared pipe deforms within a stress allowable range.
In the invention, as a preferred technical scheme, the flaring part of the positioning ring is mechanically connected to the flaring part of the flaring pipe, and further, when the positioning ring is mechanically matched with the flaring pipe, a radial load is applied to the flaring pipe, so that the flaring part of the positioning ring can be further forcibly embedded into the flaring part of the flaring pipe, the purpose of applying radial inward pressure to the flaring part of the flaring pipe is achieved, and the size of the flaring part of the specific flaring pipe is deformed within a stress allowable range.
In the invention, as a preferable technical scheme, a snap ring is arranged at one end of the inner nest, the outer diameter of the snap ring is larger than the inner diameter of the flared pipe and smaller than the outer diameter of the flared pipe, or the outer diameter of the snap ring is smaller than the inner diameter of the flared pipe, the size of the sleeve body is larger than the inner diameter of the straight insertion pipe and smaller than the outer diameter of the straight insertion pipe, the size design of the integral inner nest further ensures the mechanical connection relation of the inner nest and the interference fit between the straight insertion pipe and the flared pipe, or the outer diameter of the snap ring is smaller than the inner diameter of the flared pipe, so that the inner nest can be further mechanically assembled into the.
In the invention, as a preferable technical scheme, the snap ring embedded and sleeved with the locating ring is mechanically connected to the flaring opening of the flaring pipe, and the snap ring can be further forced to generate a radially outward supporting force on the flaring opening of the flaring pipe in an interference fit mode of the snap ring and the flaring opening of the flaring pipe, so that the locating ring has a further supporting effect on a deformation part generated by the radially inward pressure of the flaring pipe.
The beneficial effect of global design: from the aspect of product connection structure design, the invention relates to a welding-free connecting pipe joint which adopts a welding-free cold connection mode, and achieves welding-free connection between pipe fittings and natural sealing insertion in an ideal state by fully utilizing the physical characteristics of metal pipes and reasonably deforming and matching; compared with the existing common copper-aluminum pipe joint, the copper-aluminum pipe joint has the advantages and characteristics that the copper joint on the existing copper-aluminum pipe joint in the market is replaced by the inner nesting in design, the copper material loss can be reduced due to material saving, the product process is reduced, the metal material loss of the product is reduced, and the effect the same as that of the existing joint can be further realized, and even better.
Drawings
FIG. 1 is a schematic diagram of an overall front view structure in an embodiment of the invention;
FIG. 2 is an exploded perspective view of the embodiment of the present invention
FIG. 3 is a sectional view of the inner part of the embodiment of the invention;
FIG. 4 is a schematic structural diagram of an inner nested part in the embodiment of the invention;
FIG. 5 is a diagram illustrating the positioning ring components of an embodiment of the present invention.
In the figure, 1-flared tube, 101-flared section, 102-flared tube flared section, 2-positioning ring, 201-positioning ring flared section, 202-positioning ring flared section, 203-original section, 3-quick-closing ring, 4-inner nesting, 401-snap ring, 402-sleeve body and 5-straight-insertion tube
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Referring to fig. 1-5, a weld-free joint for connecting pipes includes,
a positioning ring 2 having an outer surface defining a passage for the flared tube 1;
the first connecting body is formed by mechanically connecting the positioning ring 2 and the flared tube 1;
an inner nest 4 having a tube defined for a straight cannula 5;
the second coupling body is formed by mechanically connecting the inner nest 4 and the straight insertion pipe 5;
a third coupling body mechanically connected by the second coupling body part within the flared tube 1 contained by the first coupling body part;
a snap ring 3 having an outer surface defining said flared tube 1 for said third coupling, and after said third coupling is mechanically coupled.
In the invention, as a preferred technical scheme, the positioning ring 2 is an expanding ring and is provided with an original section 203 and a positioning ring expanding section 202, the connecting position of the original section 203 and the positioning ring expanding section 202 is a positioning ring expanding 201, the inner diameters of the pipe orifices of the original section 203 and the positioning ring expanding section 202 are smaller than the outer diameter of the expanding pipe 1 mechanically matched with the original section 203 and the positioning ring expanding section 202, and further, the interference fit between the positioning ring 2 and the expanding pipe 1 is realized, so that the positioning ring 2 applies radial load to the expanding pipe 1 when the positioning ring 2 and the expanding pipe 1 are in interference fit, and the size of the expanding pipe 1 deforms within a stress allowable range.
In the invention, as a preferred technical scheme, the positioning ring flaring port 201 is mechanically connected to the flaring tube flaring port 102, and further, when mechanically matched with the flaring tube 1, a radial load is applied to the flaring tube 1, so that the positioning ring flaring port 201 can be further forcibly inserted into the flaring tube flaring port 102, the purpose of applying radial inward pressure to the flaring tube flaring port 102 is achieved, and the size of the specific flaring tube flaring port 102 is deformed within a stress allowable range.
In the invention, as a preferred technical scheme, a snap ring 401 is arranged at one end of the inner nest 4, and the outer diameter of the snap ring 401 is larger than the inner diameter of the flared tube 1 and smaller than the outer diameter of the flared tube 1, or the outer diameter of the snap ring 401 is smaller than the inner diameter of the flared tube 1, and the size of the sleeve body 402 is larger than the inner diameter of the straight insertion tube 5 and smaller than the outer diameter of the straight insertion tube 5, so that the mechanical connection relation of interference fit between the inner nest 4 and the straight insertion tube 5 and the flared tube 1 is further ensured, or the outer diameter of the snap ring 401 is smaller than the inner diameter of the flared tube 1, and further mechanical assembly of the inner nest 4 into the straight insertion.
In the invention, as a preferable technical scheme, the snap ring 401 arranged in the inner nest 4 is mechanically connected to the flared tube flaring port 102, and the snap ring 401 can be further forced to generate a radial outward supporting force on the flared tube flaring port 102 in an interference fit mode of the snap ring 401 and the flared tube flaring port 102, so that the positioning ring 2 has a further supporting effect on a deformed part generated by the radial inward pressure of the flared tube 1.
The whole process is installed and implemented:
during installation, the positioning ring 2 and the flared tube 1 are mechanically connected in an interference fit mode through mechanical force, the positioning ring flared part 201 included by the positioning ring 2 is externally embedded into the outer side of the flared tube flared part 102 included by the flared tube 1 in an interference fit mode in a specific matched installation state, and the original section 203 of the positioning ring 2 is in interference fit with the flared tube 1 to enable the whole flared tube 1 to shrink and deform within a stress allowable range, so that a first connecting body is formed, at the moment, the first connecting body is in a state that the positioning ring 2 exerts inward pressure on the flared tube 1, meanwhile, the flared tube flared part 102 generates inward compression deformation force perpendicular to the position, and the positioning ring flared part 201 exerts inward radial force on the flared tube flared part 102; then, the inner nest 4 is installed in a matched mode with the straight insertion pipe 5 in an interference fit mode through mechanical force, and a clamping ring 401 arranged on the inner nest 4 is further attached to the pipe orifice of the straight insertion pipe 5 to form a second coupling body; then the snap ring 401 on the second coupling body is opposite to the mouth of the flared section 101 of the flared tube 1 of the first coupling body, and coaxial insertion is carried out through mechanical force, so that the snap ring 401 on the second coupling body is embedded into the flared tube flared section 102 of the flared tube of which the stress allowable range is contracted and deformed in the flared section 101 of the first coupling body, thereby forming a third coupling body, at the moment, the state of the third coupling body is that the snap ring 401 is embedded into the flared tube flared section 102 of the flared tube of which the stress allowable range is contracted and deformed in the flared tube flared section 101 of the first coupling body, a force opposite to the inward compressive deformation force at the position perpendicular to the flared tube flared section 102 can be generated, and the force is balanced, and when the second coupling body is mechanically assembled into the first coupling body, because the flared tube flared section 201 of the first coupling body generates a radial inward force effect on the flared tube flared section 102, so that when the second coupling body is, preventing the second coupling body from damaging the flare 102 of the flare of the first coupling body under the action of mechanical force; finally, the quick-closing ring 3 is mounted by mechanical force from the flared end 101 of the flared tube 1 of the third coupling body with a coaxial interference fit and with the front end of the quick-closing ring 3 mounted against the flared end 202 of the positioning ring 2, thus forming a complete whole.
The complete working process comprises the following steps: the physical property of the metal material is reasonably utilized, when the first and the second coupling bodies are prepared and the first and the second coupling bodies are coaxially inserted in place, namely, the snap ring 401 arranged on the inner nest 4 is attached to the flaring pipe flaring port 102, at this time, an external force is applied between the positioning ring 2 and the quick-closing ring 3, firstly, the positioning ring 2 can overturn by taking the vertical surface vertical to the flaring pipe flaring port 102 as an axis and taking the circular diameter as a track towards the direction of the quick-closing ring 3, so that the positioning ring 2 further radially compresses the flaring section 101 of the flaring pipe 1, the diameter reduction of the flaring section 101 of the flaring pipe 1 can prevent the second coupling body from withdrawing from the first coupling body, and simultaneously, the radial supporting force of the snap ring 401 of the inner nest 4 can be realized, the supporting force for the flaring tube flaring port 102 enables the flaring tube flaring port 102 to bear larger external force, thereby ensuring the realization of the reliable connection process of the metal pipes and the low-cost connection and sealing requirements to be achieved.
Elevation: the term "facade" as used in this installation is not an industry term and refers only to a facade that is formed vertically and through the center of a cylindrical workpiece during assembly.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A welding-free connecting pipe joint comprises a connecting pipe body,
a positioning ring having an outer surface defining a flared tube;
the first connecting body is formed by mechanically connecting the positioning ring and the flared tube;
an inner nest having a tube defined for a straight cannula;
the second coupling body is formed by mechanically connecting the inner nesting pipe and the straight inserting pipe;
a third coupling body mechanically coupled by the second coupling body portion within the flare tube contained by the first coupling body portion;
a snap ring having said flared tube outer surface defined for said third coupling body, and after said third coupling body is mechanically coupled.
2. The solderless connecting tube joint of claim 1, wherein: the positioning ring is a flared ring and is provided with an original section and a positioning ring flared section, and the joint position of the original section and the positioning ring flared section is the positioning ring flared part.
3. The solderless connecting tube joint of claim 2, wherein: and the flaring part of the positioning ring is mechanically connected to the flaring part of the flaring pipe.
4. The solderless connecting tube joint of claim 1, wherein: the inner nesting end is provided with a clamping ring, the outer diameter of the clamping ring is larger than the inner diameter of the flared pipe and smaller than the outer diameter of the flared pipe, or the outer diameter of the clamping ring is smaller than the inner diameter of the flared pipe.
5. The solderless connecting tube joint of claim 4, wherein: the snap ring that the embedded cover was equipped with mechanically connect in flaring pipe flaring department.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237187.6A CN110778813A (en) | 2019-12-05 | 2019-12-05 | Welding-free connecting pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237187.6A CN110778813A (en) | 2019-12-05 | 2019-12-05 | Welding-free connecting pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110778813A true CN110778813A (en) | 2020-02-11 |
Family
ID=69394229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237187.6A Pending CN110778813A (en) | 2019-12-05 | 2019-12-05 | Welding-free connecting pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110778813A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735445A (en) * | 1993-05-18 | 1995-02-07 | Mitsubishi Heavy Ind Ltd | Strainer |
| CN2506838Y (en) * | 2001-05-08 | 2002-08-21 | 梁文华 | Pipe joint |
| CN205781511U (en) * | 2016-07-05 | 2016-12-07 | 南京协众汽车空调集团有限公司 | Butt welding structure exempted from by the air conditioning for automobiles pipe fitting of a kind of band pressing plate joint |
| US20180119851A1 (en) * | 2012-02-17 | 2018-05-03 | Core Linepipe Inc. | Pipe, pipe connection and pipeline system |
| CN208011105U (en) * | 2017-12-29 | 2018-10-26 | 重庆华超金属有限公司 | A kind of pipeline jointing construction for exempting from weldering |
| CN211145648U (en) * | 2019-12-05 | 2020-07-31 | 青岛速合连接技术有限公司 | Welding-free connecting pipe joint |
-
2019
- 2019-12-05 CN CN201911237187.6A patent/CN110778813A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735445A (en) * | 1993-05-18 | 1995-02-07 | Mitsubishi Heavy Ind Ltd | Strainer |
| CN2506838Y (en) * | 2001-05-08 | 2002-08-21 | 梁文华 | Pipe joint |
| US20180119851A1 (en) * | 2012-02-17 | 2018-05-03 | Core Linepipe Inc. | Pipe, pipe connection and pipeline system |
| CN205781511U (en) * | 2016-07-05 | 2016-12-07 | 南京协众汽车空调集团有限公司 | Butt welding structure exempted from by the air conditioning for automobiles pipe fitting of a kind of band pressing plate joint |
| CN208011105U (en) * | 2017-12-29 | 2018-10-26 | 重庆华超金属有限公司 | A kind of pipeline jointing construction for exempting from weldering |
| CN211145648U (en) * | 2019-12-05 | 2020-07-31 | 青岛速合连接技术有限公司 | Welding-free connecting pipe joint |
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