CN204692788U - Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof - Google Patents
Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof Download PDFInfo
- Publication number
- CN204692788U CN204692788U CN201520389942.3U CN201520389942U CN204692788U CN 204692788 U CN204692788 U CN 204692788U CN 201520389942 U CN201520389942 U CN 201520389942U CN 204692788 U CN204692788 U CN 204692788U
- Authority
- CN
- China
- Prior art keywords
- adapter
- embedded
- direct
- socket
- pipe
- 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.)
- Expired - Fee Related
Links
Landscapes
- Joints With Sleeves (AREA)
Abstract
The utility model belongs to connecting tube technical field, especially relates to a kind of direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof.This direct-type embedded electromagnetic welding double tube structure comprises embedded direct-type joint and composite pipe, metal connecting sleeve is embedded with in an adapter of embedded direct-type joint, another is provided with socket pipe in taking over and the inner circumference of socket pipe is connected as a single entity with this adapter, composite pipe comprises metal tube layer and is compounded in the external tube layer in interior tube layer inside metal tube layer and outside, socket is accepted between nozzle inner wall and socket pipe outer wall, also comprise stuffing box gland, stuffing box gland and the adjacent one end of adapter have ring packing plane and ring packing plane is arranged on the opening end end face of described undertaking socket, metal tube layer makes interior tube layer and socket pipe hot melt be integrated respectively after electromagnetic induction heating, external tube layer and adapter hot melt are integrated, and stuffing box gland and external tube layer hot melt are integrated.Advantage is: be beneficial to and improve sealing between body and joint.
Description
Technical field
The utility model belongs to connecting tube technical field, especially relates to a kind of direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof.
Background technique
Multiple tube forms composite pipe by being compounded with metal layer in the middle of plastic tube and being connected and composed by joint, metal layer due to tubing mesosphere is airtight, has good resistance oxygen effect, can be directly used in direct drinking water project, and its internal and external layer is plastic material, there is extraordinary corrosion resistance.Therefore the purposes of multiple tube widely, and in oil, natural gas transport, work pipes for mining, water drinking tube, the various field of waste pipe etc. all can be applied.The metallic character of the connection general metal layer of its joint of current multiple tube and composite pipe, by electromagnetic welding, but be connected not tight between body with joint, easily there is gap in welding end, sealing is poor.
Etc. technological deficiency.
In order to improve prior art, people have carried out long-term exploration, propose various solution.Such as, Chinese patent literature discloses a kind of steel plastic composite structure wall tube [application number: CN200820158041.3], is made of welded connection by hot melt adhesive by the T-shaped band spiral winding of steel plastic compount, forms the U-shaped structural walls pipeline with stiffening rib.
Although such scheme to some extent solves the deficiencies in the prior art, be connected not tight between body with joint, easily there is gap in welding end, sealing is poor, and global design is reasonable not enough, poor practicability.
Model utility content
The purpose of this utility model is for the problems referred to above, provides a kind of reasonable in design, and structure is simple, be beneficial to the embedded electromagnetic welding double tube structure of direct-type improving sealing between body and joint.
The purpose of this utility model is for the problems referred to above, and provide a kind of reasonable in design, structure is simple, the embedded direct-type joint with direct-type embedded electromagnetic welding double tube structure of good airproof performance.
For achieving the above object, the utility model have employed following technical proposal: the embedded electromagnetic welding double tube structure of this direct-type, comprise embedded direct-type joint and composite pipe, metal connecting sleeve is embedded with in an adapter of described embedded direct-type joint, the socket pipe that coaxially arranges with this adapter is provided with and the inner circumference of socket pipe is connected as a single entity with this adapter in another adapter, described composite pipe comprises the metal tube layer be made up of electromagnetic induction heat generating material and the external tube layer being compounded in tube layer and outside in inside metal tube layer, it is characterized in that, formed between described nozzle inner wall and socket pipe outer wall and insert and the undertaking socket that adapts of shape and insertion composite pipe shape wherein for composite pipe, this pipeline configuration also comprises the stuffing box gland being set in composite pipe periphery, described stuffing box gland and the adjacent one end of adapter have ring packing plane and ring packing plane is arranged on the opening end end face of described undertaking socket, described metal tube layer makes interior tube layer and socket pipe hot melt be integrated respectively after electromagnetic induction heating, external tube layer and adapter hot melt are integrated, and stuffing box gland and external tube layer hot melt are integrated.Formed between adapter and socket pipe and accept socket, composite pipe inserts to be accepted in socket, the interior tube layer of composite pipe is formed as one the first order with the interior edge face hot melt accepting socket and seals, the composite pipe of composite pipe and the exterior edge face hot melt of undertaking socket are formed as one second level sealing, described stuffing box gland and stuffing box gland hot melt are formed as one third level sealing, be connected closely between composite pipe with embedded direct-type joint, welding end is not easy to occur gap, there are three grades of sealings, good airproof performance, global design is reasonable, practical, is beneficial to industrialization promotion.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the adapter sidepiece being inside provided with socket pipe have at least one can make undertaking socket and the external world through and when can by the exhaust port of shutoff after hot melt.When socket pipe, between composite pipe and adapter during hot melt, hot gas is discharged by exhaust port, prevents hot melt place from producing bubble by the impact of gas, improves sealing.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the outer end of described socket pipe extends to outside adapter; Inside the outer end of described socket pipe, there is circular cone.Circular cone is beneficial to the hot melt between socket pipe and socket pipe, and this extending end is as hot melt place.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the outer surface of described adapter has axially extension and some raised lines of circumference distribution.Raised line improves the frictional force on adapter surface, is beneficial to adapter grips when composite pipe and adapter connect, and avoids occurring skidding.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the described adapter being embedded with metal connecting sleeve and another take over and be on same axis.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, described metal tube layer is made of steel or iron, and described interior tube layer, external tube layer and embedded direct-type joint are made up of hot melt material respectively.Steel or iron low price, and heating effect is good, good rigidly.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the inner of described undertaking socket forms planar annular, and described composite pipe inserts the interior edge face accepting socket one end and to fit on described planar annular and planar annular described in after hot melt and interior edge face disappear because hot melt material hot melt is integrated.
In the embedded electromagnetic welding double tube structure of above-mentioned direct-type, the external diameter of described composite pipe is 20mm-400mm.
Apply the embedded direct-type joint of above-mentioned direct-type embedded electromagnetic welding double tube structure, comprise the joint body with two adapters, it is characterized in that, metal connecting sleeve is embedded with wherein in an adapter, the socket pipe that coaxially arranges with this adapter is provided with and the inner circumference of socket pipe is connected as a single entity with this adapter in another adapter, formed between described nozzle inner wall and socket pipe outer wall and insert and the undertaking socket that adapts of shape and insertion composite pipe shape wherein for composite pipe, the adapter sidepiece being inside provided with socket pipe have at least one can make undertaking socket and the external world through and when can by the exhaust port of shutoff after hot melt.Formed between adapter and socket pipe and accept socket, composite pipe inserts to be accepted in socket, the interior tube layer of composite pipe is formed as one the first order with the interior edge face hot melt accepting socket and seals, the composite pipe of composite pipe and the exterior edge face hot melt of undertaking socket are formed as one second level sealing, described stuffing box gland and stuffing box gland hot melt are formed as one third level sealing, be connected closely between composite pipe with embedded direct-type joint, welding end is not easy to occur gap, there are three grades of sealings, good airproof performance, exhaust port is beneficial to socket pipe, the hot gas produced during hot melt between composite pipe and adapter is discharged, prevent hot melt place from producing bubble by the impact of gas, improve sealing.
In above-mentioned embedded direct-type joint, the outer end of described socket pipe extends to outside adapter; Inside the outer end of described socket pipe, there is circular cone.Circular cone is beneficial to the hot melt between socket pipe and socket pipe, and this extending end is as hot melt place.
Compared with prior art, the advantage of this direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof is:
First, formed between adapter and socket pipe and accept socket, composite pipe inserts to be accepted in socket, the interior tube layer of composite pipe is formed as one the first order with the interior edge face hot melt accepting socket and seals, the composite pipe of composite pipe and the exterior edge face hot melt of undertaking socket are formed as one second level sealing, described stuffing box gland and stuffing box gland hot melt are formed as one third level sealing, be connected closely between composite pipe with embedded direct-type joint, welding end is not easy to occur gap, have three grades of sealings, good airproof performance, global design is reasonable, practical, be beneficial to industrialization promotion.
The second, when socket pipe, between composite pipe and adapter during hot melt, hot gas is discharged by exhaust port, prevents hot melt place from producing bubble by the impact of gas, improves sealing.
3rd, circular cone is beneficial to the hot melt between socket pipe and composite pipe, and this extending end is as hot melt place.
4th, raised line improves the frictional force on adapter surface, is beneficial to adapter grips when composite pipe and adapter connect, and avoids occurring skidding; Metal tube layer is made of steel or iron, and steel or iron low price, reduce production cost, and heating effect is good, good rigidly.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model provides,
In figure, embedded direct-type joint 1, composite pipe 2, adapter 3, metal connecting sleeve 4, socket pipe 5, metal tube layer 6, interior tube layer 7, external tube layer 8, undertaking socket 9, stuffing box gland 10, exhaust port 11, circular cone 12, raised line 13, planar annular 4, interior edge face 15.
Embodiment
Embodiment
As shown in Figure 1, this direct-type embedded electromagnetic welding double tube structure comprises embedded direct-type joint 1 and composite pipe 2, metal connecting sleeve 4 is embedded with in an adapter 3 of embedded direct-type joint 1, the coaxial socket pipe 5 that arranges with this adapter 3 is provided with and the inner circumference of socket pipe 5 is connected as a single entity with this adapter 3 in another adapter 3, composite pipe 2 comprises the metal tube layer 6 be made up of electromagnetic induction heat generating material and the external tube layer 8 being compounded in tube layer 7 and outside in inside metal tube layer 6, it is characterized in that, formed between adapter 3 inwall and socket pipe 5 outer wall and insert and the undertaking socket 9 that adapts of shape and insertion composite pipe 2 shape wherein for composite pipe 2, this pipeline configuration also comprises the stuffing box gland 10 being set in composite pipe 2 periphery, one end that stuffing box gland 10 is adjacent with adapter 3 has ring packing plane and ring packing plane is arranged on the opening end end face of described undertaking socket 9, metal tube layer 6 makes interior tube layer 7 be integrated with socket pipe 5 hot melt respectively after electromagnetic induction heating, external tube layer 8 and adapter 3 hot melt are integrated, and stuffing box gland 10 is integrated with external tube layer 8 hot melt.Formed between adapter 3 and socket pipe 5 and accept socket 9, composite pipe 2 inserts to be accepted in socket 9, the interior tube layer 7 of composite pipe 2 is formed as one the first order with interior edge face 15 hot melt accepting socket 9 and seals, the composite pipe 2 of composite pipe 2 and the exterior edge face hot melt of undertaking socket 9 are formed as one second level sealing, stuffing box gland 10 and stuffing box gland 10 hot melt are formed as one third level sealing, be connected closely between composite pipe 2 with embedded direct-type joint 1, welding end is not easy to occur gap, there are three grades of sealings, good airproof performance, global design is reasonable, practical, be beneficial to industrialization promotion.
Wherein, adapter 3 sidepiece being inside provided with socket pipe 5 has at least one can make undertaking socket 9 and the external world through and when can by the exhaust port 11 of shutoff after hot melt.When socket pipe 5, between composite pipe 2 and adapter 3 during hot melt, hot gas is discharged by exhaust port 11, prevents hot melt place from producing bubble by the impact of gas, improves sealing.Improve as one, the outer end of socket pipe 5 extends to outside adapter 3; There is inside the outer end of socket pipe 5 circular cone 12.Circular cone 12 is beneficial to the hot melt between socket pipe 5 and socket pipe 5, and this extending end is as hot melt place.More particularly, the inner of accepting socket 9 forms planar annular 14, and composite pipe 2 inserts to be accepted the interior edge face 15 of socket 9 one end and to fit on described planar annular 14 and when planar annular after hot melt 14 and interior edge face 15 disappear because hot melt material hot melt is integrated.Improve as one, the outer surface of adapter 3 has axially extension and some raised lines 13 of circumference distribution.Raised line 13 improves the frictional force on adapter 3 surface, is beneficial to adapter 3 grips when composite pipe 2 and adapter 3 connect, and avoids occurring skidding.Improve as one, the adapter 3 being embedded with metal connecting sleeve 4 is on same axis with another adapter 3.Metal tube layer 6 is made of steel or iron, and interior tube layer 7, external tube layer 8 and embedded direct-type joint 1 are made up of hot melt material respectively.Steel or iron low price, and heating effect is good, good rigidly.The external diameter of composite pipe 2 is 20mm-400mm.
Originally there is the embedded direct-type joint of direct-type embedded electromagnetic welding double tube structure, comprise the joint body with two adapters 3, it is characterized in that, metal connecting sleeve 4 is embedded with wherein in an adapter 3, the coaxial socket pipe 5 that arranges with this adapter 3 is provided with and the inner circumference of socket pipe 5 is connected as a single entity with this adapter 3 in another adapter 3, formed between adapter 3 inwall and socket pipe 5 outer wall and insert and the undertaking socket 9 that adapts of shape and insertion composite pipe 2 shape wherein for composite pipe 2, adapter 3 sidepiece being inside provided with socket pipe 5 has at least one can make undertaking socket 9 and the external world through and when can by the exhaust port 11 of shutoff after hot melt.Formed between adapter 3 and socket pipe 5 and accept socket 9, composite pipe 2 inserts to be accepted in socket 9, the interior tube layer 7 of composite pipe 2 is formed as one the first order with interior edge face 15 hot melt accepting socket 9 and seals, the composite pipe 2 of composite pipe 2 and the exterior edge face hot melt of undertaking socket 9 are formed as one second level sealing, stuffing box gland 10 and stuffing box gland 10 hot melt are formed as one third level sealing, be connected closely between composite pipe 2 with embedded direct-type joint 1, welding end is not easy to occur gap, there are three grades of sealings, good airproof performance, exhaust port 11 is beneficial to socket pipe 5, the hot gas produced during hot melt between composite pipe 2 and adapter 3 is discharged, prevent hot melt place from producing bubble by the impact of gas, improve sealing.Improve as one, the outer end of socket pipe 5 extends to outside adapter 3; There is inside the outer end of socket pipe 5 circular cone 12.Circular cone 12 is beneficial to the hot melt between socket pipe 5 and socket pipe 5, and this extending end is as hot melt place.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Although more employ embedded direct-type joint 1, composite pipe 2, adapter 3, metal connecting sleeve 4, socket pipe 5, metal tube layer 6, interior tube layer 7, external tube layer 8 herein, accept the terms such as socket 9, stuffing box gland 10, exhaust port 11, circular cone 12, raised line 13, planar annular 4, interior edge face 15, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present utility model more easily; The restriction that they are construed to any one additional is all contrary with the utility model spirit.
Claims (10)
1. the embedded electromagnetic welding double tube structure of direct-type, comprise embedded direct-type joint (1) and composite pipe (2), metal connecting sleeve (4) is embedded with in an adapter (3) of described embedded direct-type joint (1), the coaxial socket pipe (5) that arranges with this adapter (3) is provided with and inner circumferential and this adapter (3) of socket pipe (5) is connected as a single entity in another adapter (3), described composite pipe (2) comprises the external tube layer (8) in the metal tube layer (6) be made up of electromagnetic induction heat generating material and the interior tube layer (7) be compounded in inside metal tube layer (6) and outside, it is characterized in that, formed between described adapter (3) inwall and socket pipe (5) outer wall and insert and the undertaking socket (9) that adapts of shape and insertion composite pipe wherein (2) shape for composite pipe (2), this pipeline configuration also comprises the stuffing box gland (10) being set in composite pipe (2) periphery, described stuffing box gland (10) and adapter (3) adjacent one end have ring packing plane and ring packing plane is arranged on the opening end end face of described undertaking socket (9), described metal tube layer (6) makes interior tube layer (7) and socket pipe (5) hot melt be integrated respectively after electromagnetic induction heating, external tube layer (8) is integrated with adapter (3) hot melt, and stuffing box gland (10) is integrated with external tube layer (8) hot melt.
2. the embedded electromagnetic welding double tube structure of direct-type according to claim 1, it is characterized in that, adapter (3) sidepiece being inside provided with socket pipe (5) has at least one can make undertaking socket (9) and the external world through and when can by the exhaust port of shutoff (11) after hot melt.
3. the embedded electromagnetic welding double tube structure of direct-type according to claim 1 and 2, is characterized in that, the outer end of described socket pipe (5) extends to adapter (3) outward; Inside the outer end of described socket pipe (5), there is circular cone (12).
4. the embedded electromagnetic welding double tube structure of direct-type according to claim 3, is characterized in that, the outer surface of described adapter (3) has axially extension and some raised lines (13) of circumference distribution.
5. the embedded electromagnetic welding double tube structure of direct-type according to claim 3, is characterized in that, the described adapter (3) being embedded with metal connecting sleeve (4) is taken over (3) with another and is on same axis.
6. the embedded electromagnetic welding double tube structure of direct-type according to claim 3, it is characterized in that, described metal tube layer (6) is made of steel or iron, and described interior tube layer (7), external tube layer (8) and embedded direct-type joint (1) are made up of hot melt material respectively.
7. the embedded electromagnetic welding double tube structure of direct-type according to claim 6, it is characterized in that, the inner of described undertaking socket (9) forms planar annular (14), and described composite pipe (2) inserts the interior edge face (15) accepting socket (9) one end and fits in described planar annular (14) upper and planar annular (14) described in after hot melt and interior edge face (15) and disappear because hot melt material hot melt is integrated.
8. the embedded electromagnetic welding double tube structure of direct-type according to claim 3, is characterized in that, the external diameter of described composite pipe (2) is 20mm-400mm.
9. be applied to the embedded direct-type joint of the direct-type embedded electromagnetic welding double tube structure in claim 1-8 described in any one, comprise the joint body with two adapters (3), it is characterized in that, metal connecting sleeve (4) is embedded with wherein in an adapter (3), the coaxial socket pipe (5) that arranges with this adapter (3) is provided with and inner circumferential and this adapter (3) of socket pipe (5) is connected as a single entity in another adapter (3), formed between described adapter (3) inwall and socket pipe (5) outer wall and insert and the undertaking socket (9) that adapts of shape and insertion composite pipe wherein (2) shape for composite pipe (2), adapter (3) sidepiece being inside provided with socket pipe (5) has at least one can make undertaking socket (9) and the external world through and when can by the exhaust port of shutoff (11) after hot melt.
10. embedded direct-type joint according to claim 9, is characterized in that, the outer end of described socket pipe (5) extends to adapter (3) outward; Inside the outer end of described socket pipe (5), there is circular cone (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520389942.3U CN204692788U (en) | 2015-06-08 | 2015-06-08 | Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520389942.3U CN204692788U (en) | 2015-06-08 | 2015-06-08 | Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204692788U true CN204692788U (en) | 2015-10-07 |
Family
ID=54233081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520389942.3U Expired - Fee Related CN204692788U (en) | 2015-06-08 | 2015-06-08 | Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204692788U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439279A (en) * | 2016-11-30 | 2017-02-22 | 罗贤想 | Steel-plastic composite pipe connector |
| CN108119709A (en) * | 2016-11-30 | 2018-06-05 | 罗贤想 | A kind of steel plastic compount pipe connections |
| CN111065854A (en) * | 2017-09-04 | 2020-04-24 | 德国诺玛公司 | Plumbing fitting with bonded joints |
-
2015
- 2015-06-08 CN CN201520389942.3U patent/CN204692788U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439279A (en) * | 2016-11-30 | 2017-02-22 | 罗贤想 | Steel-plastic composite pipe connector |
| CN108119709A (en) * | 2016-11-30 | 2018-06-05 | 罗贤想 | A kind of steel plastic compount pipe connections |
| CN108119709B (en) * | 2016-11-30 | 2020-10-02 | 湖北大洋塑胶有限公司 | Steel-plastic composite pipe connector |
| CN111065854A (en) * | 2017-09-04 | 2020-04-24 | 德国诺玛公司 | Plumbing fitting with bonded joints |
| CN111065854B (en) * | 2017-09-04 | 2022-03-15 | 德国诺玛公司 | Plumbing fitting with bonded joints |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203500680U (en) | Bimetal composite pipe with stainless steel pipe connector and two staggered double-welding layers | |
| CN204692788U (en) | Direct-type embedded electromagnetic welding double tube structure and embedded direct-type joint thereof | |
| CN204692867U (en) | Curvedly connect formula outer electromagnetic welding double tube structure and outerly curvedly connect formula joint | |
| CN203404513U (en) | Connecting pipe fitting | |
| CN204692874U (en) | Curvedly connect the embedded electromagnetic welding double tube structure of formula and elbow connection thereof | |
| CN204692876U (en) | Direct-type outer electromagnetic welding double tube structure and outer direct-type joint thereof | |
| CN204692855U (en) | Three way type embedded electromagnetic welding double tube structure and embedded tee union thereof | |
| CN204692875U (en) | Single-connecting type electromagnetic welding double tube structure and single-connecting type joint thereof | |
| CN204692870U (en) | Direct-type electromagnetic welding double tube structure and straight joint thereof | |
| CN204164528U (en) | A kind of welding type pipe fitting joint applying single lip sealing ring | |
| CN204164527U (en) | A kind of welding type pipe fitting joint applying double-lip sealing ring | |
| CN207621524U (en) | Pipeline, which docks circumferential weld, repairs sealing structure | |
| CN204692861U (en) | Three way type electromagnetic welding double tube structure and tee union thereof | |
| CN202302525U (en) | Novel polyethylene steel-plastic transition pipe fitting | |
| CN202252451U (en) | Female threaded union | |
| CN204692854U (en) | The outer electromagnetic welding double tube structure of Three way type and tee union thereof | |
| CN204692864U (en) | Curvedly connect formula electromagnetic welding double tube structure and elbow connection thereof | |
| CN204787939U (en) | Coiled pipe heat exchanger business turn over mouth connection structure | |
| CN203948846U (en) | A kind of linkage structure of metal tube | |
| CN206439531U (en) | A kind of inner liner stainless steel fitting pipe | |
| CN204692821U (en) | Embedded composite tube joint and pipe joint structure thereof | |
| CN204785159U (en) | Inlay combined type coupling outward and pipe connector structure thereof | |
| CN202955393U (en) | Bending-connection steel-plastic composite pipe with external thread insert | |
| CN205315895U (en) | Sealing washer is used in compound steel pipes connection | |
| CN202955398U (en) | Straight connection type steel-plastic composite pipe with external thread insert |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20180608 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |