CN112197086A - Plastic-glass pipe connecting electric melting pipe fitting and connecting method - Google Patents
Plastic-glass pipe connecting electric melting pipe fitting and connecting method Download PDFInfo
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- CN112197086A CN112197086A CN202011290447.9A CN202011290447A CN112197086A CN 112197086 A CN112197086 A CN 112197086A CN 202011290447 A CN202011290447 A CN 202011290447A CN 112197086 A CN112197086 A CN 112197086A
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- pipe
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- plastic
- pipelines
- pipeline
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- 238000002844 melting Methods 0.000 title claims abstract description 33
- 230000008018 melting Effects 0.000 title claims abstract description 33
- 239000011521 glass Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 113
- 239000004033 plastic Substances 0.000 claims abstract description 46
- 229920003023 plastic Polymers 0.000 claims abstract description 46
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 23
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 238000005485 electric heating Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 229920006231 aramid fiber Polymers 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000004801 Chlorinated PVC Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding 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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
- F16L47/03—Welded joints with an electrical resistance incorporated in the joint
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention belongs to the technical field of pipeline joints, and particularly relates to a plastic glass pipe connecting electric melting pipe fitting particularly suitable for connecting flexible composite pipelines and a connecting method. The main technical scheme is as follows: the structure of the pipeline comprises a pipeline section of an inner plastic pipe layer, a reinforcing layer and an outer protective layer in sequence, wherein the inner diameter of the pipeline section is matched with the outer diameter of a connected pipeline; an electric heating assembly is embedded in the inner plastic pipe layer; sleeving a pipe fitting on a connected pipeline, stripping the corresponding end parts of two pipelines to be connected to form an inner pipe layer, melting and butting the inner pipe layers of the two pipelines, moving the pipe fitting between the two butted pipelines, and electrifying and heating an electric heating assembly embedded in the inner plastic pipe layer to melt the plastic pipe layer so as to form an integral structure with the two butted pipelines. The pipeline connected by the plastic glass pipe connected with the electric melting pipe fitting has the characteristics of corrosion resistance, firm connection, high connection line strength, and good effect of realizing drift diameter and sealing.
Description
Technical Field
The invention belongs to the technical field of pipeline connection, and particularly relates to a plastic-glass pipe connection electric melting pipe fitting and a connection method, which are particularly suitable for connection of flexible composite pipelines.
Background
Pipe elements, i.e. pipe connections, are connected by means of the pipe elements between two pipelines, forming a pipeline passage. At present, pipeline connection is realized by adopting steel structure pipe fittings mostly, the steel structure pipe fittings are easy to corrode in the using process due to the material of the steel structure pipe fittings, the operation is complex when the steel structure pipe fittings are connected with pipelines, and meanwhile, the pipe fittings are connected with sealing performance which is difficult to meet the requirement due to the different pipe materials of the pipe fittings and the connected pipelines; for the plastic glass tube with the caliber of more than 200 mm, which is composed of the plastic tube layer as the inner layer, the glass fiber winding layer as the reinforcing layer and the outer protective layer formed by rubber plastic, the performance of the connecting pipe fitting, such as service life, sealing performance and the like, is difficult to meet the requirements.
The invention application with the Chinese patent application number of 201710776717.9 discloses a pipe equivalent to a connecting pipe fitting, wherein the outer surface of the pipe is fixedly connected with a polyethylene layer, a polyisobutylene layer, a polymethyl methacrylate layer, a polyvinyl alcohol layer, an acrylate layer, a asbestos layer, a chlorinated polyvinyl chloride layer, a polytetrafluoroethylene layer and an aramid fiber layer in sequence. But the arranged asbestos layer and the aramid fiber layer are matched for use, and the fire resistance, the wear resistance and the water resistance of the pipe fitting are only solved.
The utility model with publication number CN 209943700U granted by chinese patent No. 201920456194.4 discloses a plastic-glass tube connecting electric melting pipe fitting, which has a structure comprising an inner plastic tube layer, a reinforcing layer and an outer protective layer in sequence, wherein the inner diameter of the pipe section is matched with the outer diameter of the connected pipeline; an electric heating component is embedded in the inner plastic pipe layer. The plastic-glass pipe connecting electric melting pipe fitting with the structure can be fused with the inner pipe layers of two connected pipelines into a whole, so that effective connection and sealing are achieved. However, the outer diameter of the connected pipeline is matched with the inner diameter of the electric melting pipe fitting, and the connected plastic inner pipe layer has a certain length, so that the reinforcing layer between the two butted pipelines is damaged, and the strength of the joint of the connecting pipelines is greatly reduced.
Disclosure of Invention
The invention aims to provide the plastic glass tube connecting electric melting pipe fitting which has the advantages of reasonable structure, good sealing performance and pressure resistance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a plastic-glass tube connecting electric melting pipe fitting structurally comprises an inner plastic tube layer, a reinforcing layer and a pipe section of an outer protective layer in sequence, wherein an electric heating assembly is embedded in the inner plastic tube layer; the method is characterized in that: forming the inner diameter of the pipe section
Matching the outer diameter of the outer protective layer forming the pipeline to which it is connected, or
Matching the outer diameter of the reinforcing layer forming the connected pipeline.
The additional technical characteristics that constitute above-mentioned plastic glass union coupling electric smelting pipe fitting still include:
-the reinforcing layer is a woven glass fibre layer, a wound steel belt layer or a woven chemical fibre layer;
-the length of the pipe section is greater than the sum of the lengths of the outer protective layers of the two pipelines to be stripped;
and the pipe section is provided with the table-shaped clamping ring at one end or two ends, namely, the inner diameter of the outer section of the table-shaped clamping ring is matched with the outer diameter of a connected pipeline, and the inner diameter of the inner section of the table-shaped clamping ring is matched with the outer diameter of the pipe section.
The step of connecting an electrofusion pipe fitting connection line using the plastic-glass tube of claim 1, comprising:
a first step of fitting the pipe fitting of claim 1 over a pipeline to which it is connected;
secondly, stripping the corresponding end parts of the two sections of pipelines to be connected to form an inner pipe layer which is 5-20 mm long and consists of a plastic pipe layer;
thirdly, melting the inner pipe layers of the two sections of pipelines in butt joint;
and fourthly, moving the pipe fitting to the two butted pipelines, and electrifying and heating the electric heating assembly embedded in the inner plastic pipe layer to melt the plastic pipe layer so as to form an integral structure with the two butted pipelines.
In the above step of connecting the electric melting pipe fittings to the pipeline,
-removing the outer pipe layer of the connected pipeline consisting of the plastic inner pipe layer, the reinforcement layer and the outer pipe layer; the length of the pipe fitting is greater than or equal to the sum of the lengths of the outer protective layers of the stripped two pipelines;
-prior to said first step, fitting a table-type collar over one or both of the pipes to be connected; the inner diameter of the outer section of the table-shaped clamping ring is matched with the outer diameter of a connected pipeline, and the inner diameter of the inner section of the table-shaped clamping ring is matched with the outer diameter of a pipe section of the pipeline.
Compared with the prior art, the plastic-glass pipe connecting electric melting pipe fitting and the connecting method provided by the invention have the following advantages: the structure of the pipe section of the pipe fitting comprises an inner plastic pipe layer, a reinforcing layer and an outer protective layer, and an electric heating assembly is embedded in the inner plastic pipe layer of the pipe section, so that the formed connecting pipe fitting can be fused with the inner pipe layers of two connected pipelines into a whole to achieve effective connection and sealing; secondly, because the table-shaped clamp ring is arranged at one end or two ends of the pipe section and can be clamped on the connecting stubbles of the pipe fitting and the pipeline, the connection strength and the sealing performance of the pipe section can be greatly improved; thirdly, because the length of the pipe fitting is greater than or equal to the sum of the lengths of the pipe layers in the two stripped pipelines, the pipe fitting can effectively realize seamless connection with the joint of the two pipelines so as to improve the connection performance of the pipe fitting.
Drawings
FIG. 1 is a schematic view of an axial cross-sectional structure of a plastic-glass tube connected electric melting pipe fitting;
fig. 2 is a schematic view of a connecting axial cross-sectional structure of the plastic-glass pipe connecting the electrofusion pipe fitting and the connecting pipeline shown in fig. 1;
fig. 3 is a schematic view of an axial cross-sectional structure of a second plastic-glass tube connected electric melting pipe fitting;
fig. 4 is a schematic view of a connection axial cross-sectional structure of the plastic-glass pipe connecting the electrofusion pipe fitting and the connection pipeline shown in fig. 3.
Detailed Description
The structure and the working principle of the plastic-glass pipe connecting electric melting pipe fitting provided by the invention are further described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present invention is an assembly structure diagram of a first plastic-glass tube connecting electrofusion pipe fitting and two connected pipelines. The structure of the pipe section 1 sequentially comprises an inner plastic pipe layer 11, a woven glass fiber layer, a wound steel belt layer or a woven chemical fiber layer formed reinforcing layer 12 and an outer protective layer 13, wherein the inner diameter of the pipe section is matched with the outer diameter of a connected outer pipe layer 33 forming a left pipeline 2 and a right pipeline 3, namely the pipe section can be sleeved on the outer pipe layer 33 of the left pipeline or the right pipeline; an electric heating unit 14 is embedded in the inner plastic tube layer 11 constituting the pipe section, and is capable of heating and melting the inner plastic tube layer by electric current.
The steps of using the electric melting pipe fitting to connect the left pipeline 2 and the right pipeline 3 are as follows:
first peeling off the outer pipe layers 23, 33 and the reinforcing layers 22, 32 of the connected pipelines 2, 3, i.e. exposing the inner pipe layers 21, 31 of the connected pipelines 2, 3, respectively, to a length of 5-20 mm; sleeving the pipe fitting 1 with the structure on the outer pipe layer 23 of the connected pipeline 2; aligning the inner pipe layers 21 and 31 of the plastic pipe layers corresponding to the left and right pipelines 2 and 3, melting the ends thereof by heating, and extruding, melting and butting the inner pipe layers of the pipelines 2 and 3 together, so that the molten plastic substantially fills the groove 5 which is formed by peeling the outer pipe layers 23 and 33 and the reinforcing layers 22 and 32 of the pipelines 2 and 3 and has a length less than 2X (5-20 mm); the pipe fitting 1 is moved to the two butted pipelines 2 and 3 to cover the groove, the electric heating assembly embedded in the inner plastic pipe layer is electrified and heated, so that the plastic pipe layer is melted, and the pipe fitting, the outer pipe layers 23 and 33 of the two butted pipelines and the melted plastic formed in the groove form an integral structure. I.e., the connection of the left and right pipelines 2 and 3 is completed.
In the above-described structure of the electrofused pipe and the step of connecting the pipeline,
in order to further improve the connection strength and the sealing performance of the connected pipe sections, the table-shaped clamping rings 4 are arranged at two ends (which can be one end, but are preferably two ends) of the pipe section 1, namely, the inner diameter of the outer section 41 of the table-shaped clamping ring is matched with the outer diameter of the connected pipelines 2 and 3, and the inner diameter of the inner section 42 of the table-shaped clamping ring is matched with the outer diameter of the pipe section 1, namely, the table-shaped clamping rings can clamp the pipelines and the pipe sections exactly;
in order to enable the connecting pipe section 1 to form a seamless connection with the connected pipelines 2 and 3 or to enable the pipe section 1 to form an overlap joint with the connected pipelines 2 and 3, so as to further improve the tensile connection strength and the sealing performance between the connecting pipes, the length of the pipe section forming the pipe fitting is greater than or equal to the length of the groove 5, namely greater than 2X (5-20 mm);
when adding the table-shaped snap ring to the structure for forming the pipe, the table-shaped snap ring 4 should be put on the two pipes 2 and 3 to be connected before the first step of the step of connecting the left and right pipes 2 and 3 by the electric melting pipe.
As shown in fig. 3 and 4, the present invention is an assembly structure diagram of a second plastic-glass tube connecting electrofusion pipe fitting and two connected pipelines. The structure of the pipe section 1 sequentially comprises an inner plastic pipe layer 11, a reinforcing layer 12 consisting of a woven glass fiber layer, a wound steel belt layer or a woven chemical fiber layer and an outer protective layer 13, wherein the inner diameter of the pipe section is matched with the outer diameter of a connected reinforcing layer 32 forming a left pipeline 2 and a right pipeline 3, namely the pipe section can be sleeved on the reinforcing layer 32 of the left pipeline or the right pipeline; an electric heating unit 14 is embedded in the inner plastic tube layer 11 constituting the pipe section, and is capable of heating and melting the inner plastic tube layer by electric current.
The steps of using the electric melting pipe fitting to connect the left pipeline 2 and the right pipeline 3 are as follows:
firstly, peeling off the outer pipe layers 23 and 33 of the connected pipelines 2 and 3 consisting of the plastic inner pipe layers 21 and 31, the reinforcing layers 22 and 32 and the outer pipe layers 23 and 33, wherein the peeled length sum of the peeling off lengths is less than the length of the plastic glass pipe connected with the electric melting pipe fittings; then peeling off the reinforcing layers 22, 32 of the connecting pipelines 2, 3 with the length controlled between 5 and 20 mm, namely, respectively exposing the inner pipe layers 21, 31 of the connecting pipelines 2, 3 with the length between 5 and 20 mm; sleeving the pipe fitting 1 with the structure on the reinforcing layer 22 of the connected pipeline 2; aligning the inner pipe layers 21 and 31 of the plastic pipe layers corresponding to the left and right pipelines 2 and 3, melting the ends by heating, and extruding, melting and butting the inner pipe layers of the pipelines 2 and 3 together, so that the molten plastic is basically filled in the groove 5 with the length less than 2X (5-20 mm) formed by stripping the reinforcing layers 22 and 32 of the pipelines 2 and 3; the pipe fitting 1 is sleeved on the two butted pipelines 2 and 3, and the electric heating component embedded in the inner plastic pipe layer is electrified and heated, so that the plastic pipe layer is melted, and the pipe fitting, the reinforcing layers 22 and 32 of the two butted pipelines and the plastic 50 melted in the groove form an integral structure. I.e., the connection of the left and right pipelines 2 and 3 is completed.
In the above-described structure of the electrofused pipe and the step of connecting the pipeline,
in order to further improve the connection strength and the sealing performance of the connected pipe sections, the table-shaped clamping rings 4 are arranged at two ends (which can be one end, but are preferably two ends) of the pipe section 1, namely, the inner diameter of the outer section 41 of each table-shaped clamping ring is matched with the outer diameter of the connected pipelines 2 and 3, and the inner diameter of the inner section 42 of each table-shaped clamping ring is matched with the outer diameter of the pipe section 1, namely, the table-shaped clamping rings can clamp the pipelines and the pipe sections properly.
In order to enable the connecting pipe section 1 to form a seamless connection with the connected pipelines 2 and 3 or to enable the pipe section 1 to form a lap joint with the connected pipelines 2 and 3 so as to further improve the tensile connection strength and the sealing performance between the connecting pipes, the length of the pipe section forming the pipe fitting is greater than or equal to the sum of the lengths of the two stripped outer pipe layers (namely, the outer protection layers) 23 and 33 of the pipelines;
when adding the table-shaped snap ring to the structure for forming the pipe, the table-shaped snap ring 4 should be put on the two pipes 2 and 3 to be connected before the first step of the step of connecting the left and right pipes 2 and 3 by the electric melting pipe.
Claims (7)
1. A plastic-glass tube connecting electric melting pipe fitting structurally comprises an inner plastic tube layer, a reinforcing layer and a pipe section of an outer protective layer in sequence, wherein an electric heating assembly is embedded in the inner plastic tube layer; the method is characterized in that: forming the inner diameter of the pipe section
Matching the outer diameter of the outer protective layer forming the pipeline to which it is connected, or
Matching the outer diameter of the reinforcing layer forming the connected pipeline.
2. The plastic-glass tube connecting electric melting pipe fitting of claim 1, characterized in that: the reinforcing layer is a woven glass fiber layer, a wound steel belt layer or a woven chemical fiber layer.
3. The plastic-glass tube connecting electric melting pipe fitting of claim 1, characterized in that: the length of the pipe section is greater than the sum of the lengths of the outer protective layers of the two pipelines to be stripped.
4. The plastic-glass tube connecting electric melting pipe fitting of claim 1, characterized in that: the pipe is characterized in that a table-shaped snap ring is arranged at one end or two ends of the pipe section, namely, the inner diameter of the outer section of the table-shaped snap ring is matched with the outer diameter of a connected pipeline, and the inner diameter of the inner section of the table-shaped snap ring is matched with the outer diameter of the pipe section.
5. The step of connecting an electrofusion pipe fitting connection line using the plastic-glass tube of claim 1, comprising:
a first step of fitting the pipe fitting of claim 1 over a pipeline to which it is connected;
secondly, stripping the corresponding end parts of the two sections of pipelines to be connected to form an inner pipe layer which is 5-20 mm long and consists of a plastic pipe layer;
thirdly, melting the inner pipe layers of the two sections of pipelines in butt joint;
and fourthly, moving the pipe fitting to the two butted pipelines, and electrifying and heating the electric heating assembly embedded in the inner plastic pipe layer to melt the plastic pipe layer so as to form an integral structure with the two butted pipelines.
6. The step of connecting the pipe by electrofusion pipe according to claim 5, wherein: removing an outer pipe layer of the connected pipeline consisting of the plastic inner pipe layer, the reinforcing layer and the outer pipe layer; the length of the pipe fitting is greater than or equal to the sum of the lengths of the outer protective layers of the stripped two pipelines.
7. The step of connecting the pipe by electrofusion pipe according to claim 5, wherein: before the first step, sleeving a table-type snap ring on one or two pipelines to be connected; the inner diameter of the outer section of the table-shaped clamping ring is matched with the outer diameter of a connected pipeline, and the inner diameter of the inner section of the table-shaped clamping ring is matched with the outer diameter of a pipe section of the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011290447.9A CN112197086A (en) | 2020-11-17 | 2020-11-17 | Plastic-glass pipe connecting electric melting pipe fitting and connecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011290447.9A CN112197086A (en) | 2020-11-17 | 2020-11-17 | Plastic-glass pipe connecting electric melting pipe fitting and connecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112197086A true CN112197086A (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011290447.9A Pending CN112197086A (en) | 2020-11-17 | 2020-11-17 | Plastic-glass pipe connecting electric melting pipe fitting and connecting method |
Country Status (1)
| Country | Link |
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| CN (1) | CN112197086A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130134700A1 (en) * | 2011-11-16 | 2013-05-30 | Flexpipe Systems Inc. | Connection for a thermoplastic pipe, assembly and method |
| CN107687545A (en) * | 2017-09-01 | 2018-02-13 | 江苏佳润管业有限公司 | A kind of electric smelting pipe fitting |
| CN110005876A (en) * | 2019-04-06 | 2019-07-12 | 河北宇通特种胶管有限公司 | A kind of modeling glass-tube connection electric melting pipe fittings and connection method |
| CN209743849U (en) * | 2019-04-09 | 2019-12-06 | 河北宇通特种胶管有限公司 | Connecting pipe fitting for plastic glass pipe |
| CN209943700U (en) * | 2019-04-06 | 2020-01-14 | 河北宇通特种胶管有限公司 | Plastic-glass tube connection electric melting pipe fitting |
| CN211175856U (en) * | 2019-12-20 | 2020-08-04 | 成都因明凯撒管材有限责任公司 | Combined electric melting connecting pipe fitting |
| CN213018289U (en) * | 2020-11-17 | 2021-04-20 | 河北宇通特种胶管有限公司 | Plastic-glass tube connecting structure |
-
2020
- 2020-11-17 CN CN202011290447.9A patent/CN112197086A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130134700A1 (en) * | 2011-11-16 | 2013-05-30 | Flexpipe Systems Inc. | Connection for a thermoplastic pipe, assembly and method |
| CN107687545A (en) * | 2017-09-01 | 2018-02-13 | 江苏佳润管业有限公司 | A kind of electric smelting pipe fitting |
| CN110005876A (en) * | 2019-04-06 | 2019-07-12 | 河北宇通特种胶管有限公司 | A kind of modeling glass-tube connection electric melting pipe fittings and connection method |
| CN209943700U (en) * | 2019-04-06 | 2020-01-14 | 河北宇通特种胶管有限公司 | Plastic-glass tube connection electric melting pipe fitting |
| CN209743849U (en) * | 2019-04-09 | 2019-12-06 | 河北宇通特种胶管有限公司 | Connecting pipe fitting for plastic glass pipe |
| CN211175856U (en) * | 2019-12-20 | 2020-08-04 | 成都因明凯撒管材有限责任公司 | Combined electric melting connecting pipe fitting |
| CN213018289U (en) * | 2020-11-17 | 2021-04-20 | 河北宇通特种胶管有限公司 | Plastic-glass tube connecting structure |
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