CN114719112A - Bellmouth structure of corrugated pipe - Google Patents
Bellmouth structure of corrugated pipe Download PDFInfo
- Publication number
- CN114719112A CN114719112A CN202210334562.4A CN202210334562A CN114719112A CN 114719112 A CN114719112 A CN 114719112A CN 202210334562 A CN202210334562 A CN 202210334562A CN 114719112 A CN114719112 A CN 114719112A
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- bellmouth
- pipe
- reinforcing
- reinforcement
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- 230000002787 reinforcement Effects 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 7
- 235000017491 Bambusa tulda Nutrition 0.000 description 7
- 241001330002 Bambuseae Species 0.000 description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 7
- 239000011425 bamboo Substances 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002427 irreversible effect Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010865 sewage Substances 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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a bellmouth structure of a corrugated pipe, and belongs to the technical field of corrugated pipes. It has solved the not enough technical problem of bellmouth quality of current bellows. The bellmouth structure of the corrugated pipe comprises a bellmouth pipe and an bellmouth ring which are coaxially arranged, wherein the bellmouth ring comprises a guide section and a reinforcement section which are sequentially arranged in the axial direction, the inner edge of the guide section is in a conical surface shape, the small end of the guide section is fixedly connected with the bellmouth pipe, the reinforcement section is in a horn shape, the small end of the reinforcement section is fixedly connected with the large end of the guide section in a joint mode, and the longitudinal section of the reinforcement section is in a wave shape. The invention is beneficial to improving the quality of the bellmouth of the corrugated pipe and ensuring the stable operation.
Description
Technical Field
The invention belongs to the technical field of corrugated pipes, and relates to a bellmouth structure of a corrugated pipe.
Background
The PE corrugated pipe is a plastic protective sleeve extruded from polyethylene material, and is called a corrugated pipe because the inner and outer parts of the PE corrugated pipe are annular corrugated. Has the characteristics of good wear resistance, corrosion resistance and the like. Because the PE material is more corrosion-resistant, wear-resistant and ageing-resistant, green, so the PE corrugated pipe also commonly is used as a rainwater and sewage branch pipe. The double-wall corrugated pipe is a novel light pipe made of high-density polyethylene, has the characteristics of light weight, high pressure resistance, good toughness, quick construction, long service life and the like, and has an excellent pipe wall structure design, so that the cost is greatly reduced compared with pipes of other structures. And the connection is convenient and reliable, so the connector is widely applied at home and abroad. A great number of concrete pipes and cast iron pipes.
Chinese patent No. CN208859091U discloses an anti-deformation double-wall corrugated pipe, wherein one end of the double-wall corrugated pipe is provided with a flaring structure, and the other end of the double-wall corrugated pipe is provided with a plug structure, and the plug structure is inserted into the flaring structure of another pipe to realize connection between the pipes; the flaring structure is provided with an annular convex structure, and the end part of the flaring structure is provided with a guide port; the flaring structure is of a horn-shaped structure, the height value of each corrugation on the plug structure is gradually increased from the end part of the plug structure to the flaring direction, and the vertical distance value D between the wave crest of each corrugation on the plug structure and the inner wall of the flaring structure is 1-8 mm
The above structure has a certain deformation resistance, but the pipe end structure still has a large inward curling amount in the cooling process, and when the pipe end structure is subjected to axial load, irreversible buckling deformation can still be caused, and the operation quality can be influenced.
Disclosure of Invention
The invention provides a bellmouth structure of a corrugated pipe aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: the quality of the bellmouth of the corrugated pipe is improved.
The purpose of the invention can be realized by the following technical scheme:
the bellmouth structure of the corrugated pipe comprises a bellmouth pipe and an bellmouth ring which are coaxially arranged, and is characterized in that the bellmouth ring comprises a guide section and a reinforcement section which are axially and sequentially arranged, the inner edge of the guide section is in a conical surface shape, the small end of the guide section is fixedly connected with the bellmouth pipe, the reinforcement section is in a horn shape, the small end of the reinforcement section is fixedly connected with the large end of the guide section and a joint, and the longitudinal section of the reinforcement section is in a wave shape.
The bell pipe is used for forming socket fit with a pipe fitting to be butted, the joint length of the pipe fitting is prolonged, the connection sealing effect is improved, the radial size of the flared ring is larger than that of the bell pipe, and the flared ring is used for providing positioning guidance for the butted pipe fitting during socket operation, so that the operation is accurate and convenient. The bellmouth ring comprises a guide section and a reinforcement section which are sequentially arranged in the axial direction, the inner edge of the guide section connected with the bellmouth pipe is conical, the reinforcement section is in a horn shape when being connected with the big end of the guide section, so that the reinforcement section is outwards tilted in advance and keeps consistent inclination with the guide section, and the whole bellmouth shape is integrally horn-shaped, therefore, even if the bellmouth of the corrugated pipe is radially inwards curled to a certain extent after being cut and cooled, the integral bellmouth shape can be still kept, the guide and socket quality of the bellmouth is ensured to be stable, particularly, the reinforcement section is also in a wave shape, the strength of the reinforcement section is higher, each dimension of the reinforcement section has a larger deformation space, and simultaneously, the reinforcement section can generate resettable compression or tensile deformation to balance load when being subjected to the axial or radial load by being matched with the bellmouth shape, the irreversible deformation caused by the stress of the bellmouth is avoided, and the shape stability is ensured, the quality is more reliable.
In the above bellmouth structure of the corrugated pipe, the radial thickness dimension of the reinforcing section at the outer circumferential peak is larger than the radial thickness dimension of the reinforcing section at the outer circumferential valley. The wall thickness in the different regions of section of strengthening like this differs, does benefit to like this under the condition that improves bulk strength, makes the position inside wall surface that the crest corresponds more level and smooth, and resistance when doing benefit to and reducing socket joint pipe fitting location guarantees socket joint stable in quality.
In the above-described bellmouth structure of a bellows, the taper range of the flared ring is 1: 6-1: 1.5. the outward warping angle of the flared ring can make up the angle loss of the flared ring after cooling, and further the stable quality of the bell mouth is ensured.
In the bellmouth structure of the corrugated pipe, the fall between the wave crests and the wave troughs on the inner side wall of the reinforcing section is smaller than the fall between the wave crests and the wave troughs on the periphery of the reinforcing section, and the wave crests and the wave troughs on the inner side wall of the reinforcing section are in smooth transition through cambered surfaces. Therefore, the elastic performance for deformation resetting is mainly concentrated on the outer side wall of the reinforcing section, so that the inner side wall of the reinforcing section keeps a smooth contact surface, and the smoothness of socket positioning is ensured under the condition of improving the deformation resistance.
In the above-mentioned bellmouth structure of the bellows, the flared ring further includes a straight cylinder section connected to the other end of the reinforcement section, and an axial length dimension of the straight cylinder section is smaller than a radial thickness dimension of the straight cylinder section. The bellows is repeated continuous when extruding production, sets up straight section of thick bamboo section and is convenient for cutting device discernment position and carry out the accuracy cutting, and straight section of thick bamboo section can curl inwards after the cooling simultaneously, and the terminal surface of straight section of thick bamboo section can incline inwards and provide certain guide effect.
In the bellmouth structure of the corrugated pipe, the reinforcing section comprises a first convex ring and a second convex ring which are axially jointed, and the maximum outer diameter size of the first convex ring and the maximum outer diameter size of the second convex ring are approximately consistent with the outer diameter size of the straight cylinder section. Like this when whole enhancement section receives radial load, bulge loop one, bulge loop two and straight section of thick bamboo can form the supporting effect simultaneously, improve bellmouth bulk strength, and then guarantee socket joint steady quality.
In the bell mouth structure of the corrugated pipe, the straight cylinder section, the reinforcing section and the guide section are of an integrally formed structure. Therefore, the integral strength of the bell mouth is ensured to be higher, and the socket quality of the product is ensured.
Compared with the prior art, the invention has the following advantages:
the reinforcing section in the bellmouth structure of the corrugated pipe is outwards tilted in advance and keeps consistent integral inclination with the guiding section to be horn-shaped, so that even if the bellmouth of the corrugated pipe is radially inwards curled after cutting and cooling, the integral flaring-shaped shape can be still kept, the guiding and socket quality stability of the bellmouth is ensured, particularly, the reinforcing section is arranged in a wave shape, the strength of the reinforcing section is higher, the axis of the reinforcing section has a larger deformation space in the radial direction, the reinforcing section can generate resettable compression or stretching deformation according to the stress condition when the reinforcing section receives axial or radial load so as to balance the load, the irreversible deformation caused by the stress of the bellmouth is avoided, the stable shape is ensured, and the quality is more reliable.
Drawings
Fig. 1 is a schematic partial sectional structure diagram of the present embodiment.
Fig. 2 is an enlarged view of a portion a in fig. 1.
In the figure, 1, a socket pipe;
2. a flared ring; 21. a guide section; 22. a reinforcement section; 221. a first convex ring; 222. a convex ring II; 23. a straight cylinder section.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, the bell mouth structure of the corrugated pipe comprises a bell mouth pipe 1 and a flared ring 2, the flared ring 2 and the bell mouth pipe 1 are coaxially arranged, the flared ring 2 comprises a guide section 21 and a reinforcement section 22 which are sequentially arranged in the axial direction, the inner edge of the guide section 21 is in a conical surface shape, the small end of the guide section 21 is fixedly connected with the bell mouth pipe 1, the large end of the guide section 21 is fixedly connected with the small end of the reinforcement section 22 in a horn shape, and the longitudinal section of the reinforcement section 22 is in a wave shape. The bell pipe 1 is used for forming socket fit with a pipe fitting to be butted, the joint length of the pipe fitting is prolonged, the connection sealing effect is improved, the radial size of the flared ring 2 is larger than that of the bell pipe 1, and the flared ring is used for providing positioning guide for the butted pipe fitting during socket operation, so that the operation is accurate and convenient. By arranging the flaring ring 2 to comprise a guide section 21 and a reinforcement section 22 which are sequentially arranged in the axial direction, the inner edge of the guide section 21 connected with the bell pipe 1 is conical, the reinforcement section 22 is arranged to be in a horn shape in connection with the large end of the guide section 21, and the longitudinal section of the reinforcement section 22 is wavy, so that the reinforcement section 22 is raised outwards in advance and keeps the same integral inclination with the guide section 21 in the horn shape, and even if the bell mouth of the corrugated pipe is curled inwards in the radial direction after being cut and cooled, the integral flaring shape can be kept, and the guide and socket quality of the bell mouth is ensured to be stable; the strengthening section 22 is the wave setting simultaneously, makes strengthening section 22 intensity higher and self compressible reset, and strengthening section 22 self can produce resettable deformation in order to balance the load when receiving axial or radial load, avoids the bellmouth atress irreversible deformation to appear, guarantees the stable in shape, and the quality is more reliable. The radial thickness dimension at the peripheral crest of the reinforcing segment 22 is greater than the radial thickness dimension at the peripheral trough of the reinforcing segment 22. The wall thickness of the different regions of the reinforcing section 22 is different, so that the surface of the inner side wall of the position corresponding to the wave crest is smoother under the condition of improving the overall strength, resistance in the process of reducing the positioning of the socket pipe fitting is facilitated, and stable socket quality is guaranteed. Preferably, the overall inclination angle of the flared ring 2 is 15 degrees. The outward warping angle of the flared ring 2 can make up for the angle loss of the curled flared ring 2 after cooling, and further ensures the stable quality of the bell mouth. The fall between the wave crest and the wave trough of the inner side wall of the reinforcing section 22 is smaller than the fall between the wave crest and the wave trough of the periphery of the reinforcing section 22, and the wave crest and the wave trough of the inner side wall of the reinforcing section 22 are in smooth transition through an arc surface. Therefore, the elastic performance for deformation resetting is mainly concentrated on the outer side wall of the reinforcing section 22, so that the inner side wall of the reinforcing section 22 keeps a smooth contact surface, and the smoothness of socket positioning is ensured under the condition of improving the deformation resistance.
As shown in fig. 1 and 2, the flared ring 2 further includes a straight cylindrical section 23 connected to the other end of the reinforcing section 22, and the axial length dimension of the straight cylindrical section 23 is smaller than the radial thickness dimension of the straight cylindrical section 23. The bellows is repeated continuous when extruding production, sets up straight section of thick bamboo 23 and is convenient for cutting device discernment position and carry out the accuracy cutting, and straight section of thick bamboo 23 can curl inwards after the cooling simultaneously, and the terminal surface of straight section of thick bamboo 23 can incline inwards and provide certain guide effect. The reinforcing section 22 comprises a first convex ring 221 and a second convex ring 222 which are axially jointed, and the maximum outer diameter of the first convex ring 221 and the maximum outer diameter of the second convex ring 222 are approximately consistent with the outer diameter of the straight-cylindrical section 23. Therefore, when the whole reinforcing section 22 is subjected to radial load, the first convex ring 221, the second convex ring 222 and the straight cylinder section 23 can simultaneously form a supporting effect, the integral strength of the bell mouth is improved, and the stable socket quality is further ensured. The straight cylinder section 23, the reinforcing section 22 and the guiding section 21 are of an integrally formed PE pipe fitting structure. Therefore, the integral strength of the bell mouth is ensured to be higher, and the socket quality of the product is ensured.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The bellmouth structure of the corrugated pipe comprises a bellmouth pipe (1) and an bellmouth ring (2) which are coaxially arranged, and is characterized in that the bellmouth ring (2) comprises a guide section (21) and a reinforcement section (22) which are axially and sequentially arranged, the inner edge of the guide section (21) is in a conical surface shape, the small end of the guide section (21) is fixedly connected with the bellmouth pipe (1), the reinforcement section (22) is in a horn shape, the small end of the reinforcement section is fixedly connected with the large end of the guide section (21), and the longitudinal section of the reinforcement section (22) is in a wave shape.
2. Bellmouth structure of corrugated tubes according to claim 1, characterised in that the radial thickness dimension at the peripheral crests of the reinforcing segments (22) is greater than the radial thickness dimension at the peripheral troughs of the reinforcing segments (22).
3. Bellmouth structure of corrugated pipes according to claim 1 or 2, characterized in that the range of conicity of the flared ring (2) is 1: 6-1: 1.5.
4. the bellmouth structure of corrugated pipe as claimed in claim 1 or 2, wherein the height difference between the peaks and valleys of the inner sidewall of the reinforcing segment (22) is smaller than the height difference between the peaks and valleys of the outer periphery of the reinforcing segment (22), and the peaks and valleys of the inner sidewall of the reinforcing segment (22) are smoothly transited through the arc surface.
5. Bellmouth structure of corrugated pipes according to claim 1 or 2, characterized in that the flared ring (2) further comprises a straight cylindrical section (23) connected to the other end of the reinforcing section (22), the axial length dimension of the straight cylindrical section (23) being smaller than the radial thickness dimension of the straight cylindrical section (23).
6. The bellmouth structure of corrugated pipes according to claim 5, wherein the reinforcing section (22) comprises a first bulge loop (221) and a second bulge loop (222) which are axially joined, and the maximum outer diameter dimension of the first bulge loop (221) and the maximum outer diameter dimension of the second bulge loop (222) are approximately consistent with the outer diameter dimension of the straight-tube section (23).
7. Bellmouth structure of corrugated pipes according to claim 5, characterized in that the straight section (23), the reinforcement section (22) and the guide section (21) are of one-piece construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210334562.4A CN114719112A (en) | 2022-03-31 | 2022-03-31 | Bellmouth structure of corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210334562.4A CN114719112A (en) | 2022-03-31 | 2022-03-31 | Bellmouth structure of corrugated pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114719112A true CN114719112A (en) | 2022-07-08 |
Family
ID=82241846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210334562.4A Pending CN114719112A (en) | 2022-03-31 | 2022-03-31 | Bellmouth structure of corrugated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114719112A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6199592B1 (en) * | 1999-02-05 | 2001-03-13 | Hancor, Inc. | Pipe structure and method of manufacture |
| CN201535397U (en) * | 2009-10-16 | 2010-07-28 | 北京哈威工程材料有限责任公司 | Polyethylene double-wall corrugated pipe with guiding angle on socket |
| CN101952632A (en) * | 2008-02-14 | 2011-01-19 | 曼夫瑞德·A·A·鲁波克 | Double-wall corrugated pipe fitting with pipe joint |
| CN202629457U (en) * | 2012-03-30 | 2012-12-26 | 浙江伟星新型建材股份有限公司 | High-density polyethylene (HDPE) double-wall corrugated pipe with reinforced rib flaring |
| CN103277589A (en) * | 2013-05-17 | 2013-09-04 | 广东联塑机器制造有限公司 | Double-wall corrugated-pipe flared-head structure |
| US20160265700A1 (en) * | 2015-03-11 | 2016-09-15 | Manfred A.A. Lupke | Pipe coupling |
| CN208859091U (en) * | 2018-08-13 | 2019-05-14 | 联塑市政管道（河北）有限公司 | A kind of double-wall corrugated pipe of resistance to deformation |
| CN209115820U (en) * | 2018-10-29 | 2019-07-16 | 潍坊中云科研有限公司 | Double-wall corrugated pipe connection and plastic double-walled corrugated pipe with flaring |
| CN110425354A (en) * | 2019-08-30 | 2019-11-08 | 康命源（贵州）科技发展有限公司 | The release-resistant sealing structure connected between bellows |
| CN210566761U (en) * | 2019-07-02 | 2020-05-19 | 佛山联博工程科技有限公司 | Winding flaring socket solid wall structure pipe |
| CN210890424U (en) * | 2019-10-30 | 2020-06-30 | 广东永高塑业发展有限公司 | Socket type composite pipe |
| CN211901876U (en) * | 2020-04-09 | 2020-11-10 | 潍坊中云机器有限公司 | Hexagonal plastic double-wall corrugated pipe and forming die thereof |
-
2022
- 2022-03-31 CN CN202210334562.4A patent/CN114719112A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6199592B1 (en) * | 1999-02-05 | 2001-03-13 | Hancor, Inc. | Pipe structure and method of manufacture |
| CN101952632A (en) * | 2008-02-14 | 2011-01-19 | 曼夫瑞德·A·A·鲁波克 | Double-wall corrugated pipe fitting with pipe joint |
| CN201535397U (en) * | 2009-10-16 | 2010-07-28 | 北京哈威工程材料有限责任公司 | Polyethylene double-wall corrugated pipe with guiding angle on socket |
| CN202629457U (en) * | 2012-03-30 | 2012-12-26 | 浙江伟星新型建材股份有限公司 | High-density polyethylene (HDPE) double-wall corrugated pipe with reinforced rib flaring |
| CN103277589A (en) * | 2013-05-17 | 2013-09-04 | 广东联塑机器制造有限公司 | Double-wall corrugated-pipe flared-head structure |
| US20160265700A1 (en) * | 2015-03-11 | 2016-09-15 | Manfred A.A. Lupke | Pipe coupling |
| CN208859091U (en) * | 2018-08-13 | 2019-05-14 | 联塑市政管道（河北）有限公司 | A kind of double-wall corrugated pipe of resistance to deformation |
| CN209115820U (en) * | 2018-10-29 | 2019-07-16 | 潍坊中云科研有限公司 | Double-wall corrugated pipe connection and plastic double-walled corrugated pipe with flaring |
| CN210566761U (en) * | 2019-07-02 | 2020-05-19 | 佛山联博工程科技有限公司 | Winding flaring socket solid wall structure pipe |
| CN110425354A (en) * | 2019-08-30 | 2019-11-08 | 康命源（贵州）科技发展有限公司 | The release-resistant sealing structure connected between bellows |
| CN210890424U (en) * | 2019-10-30 | 2020-06-30 | 广东永高塑业发展有限公司 | Socket type composite pipe |
| CN211901876U (en) * | 2020-04-09 | 2020-11-10 | 潍坊中云机器有限公司 | Hexagonal plastic double-wall corrugated pipe and forming die thereof |
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