CN108953785A - A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system - Google Patents
A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system Download PDFInfo
- Publication number
- CN108953785A CN108953785A CN201810857869.6A CN201810857869A CN108953785A CN 108953785 A CN108953785 A CN 108953785A CN 201810857869 A CN201810857869 A CN 201810857869A CN 108953785 A CN108953785 A CN 108953785A
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- Prior art keywords
- layer
- air
- external
- screw thread
- exhaust
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- 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.)
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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
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
-
- 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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
- F16L15/007—Screw-threaded joints; Forms of screw-threads for such joints with straight threads with more than one threaded section
-
- 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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
- F16L15/008—Screw-threaded joints; Forms of screw-threads for such joints with straight threads with sealing rings
-
- 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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
-
- 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
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric 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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/16—Screw-threaded joints
-
- 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
- F16L9/00—Rigid pipes
- F16L9/006—Rigid pipes specially profiled
-
- 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
- F16L9/00—Rigid pipes
- F16L9/21—Rigid pipes made of sound-absorbing materials or with sound-absorbing structure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The present invention provides a kind of high-air-tightness pipe fittings applied to exhaust-gas treatment air-line system, connector including air hose and for connecting air hose, it is characterized by: air hose includes external tube layer and interior tube layer, the external tube layer and inner tube interlayer are equipped with hollow layer, external tube layer and inner tube interlayer are equipped with several dowels, connector includes inscribed layer and external layer, inscribed layer and external interlayer are equipped with several connection ribs, the connection rib and inscribed layer and external interlayer form hollow channel, the two ends of inscribed layer and external layer are respectively symmetrically equipped with the first internal screw thread and the second external screw thread, tube layer end is equipped with the first external screw thread with the first screw-internal thread fit in air hose, air hose external tube layer end is equipped with the second internal screw thread cooperated with the second external screw thread；The present invention is based on the hollow layer structure matching designs of air hose and connector, realize the high-air-tightness effect of pipe fitting, reduce toxic and harmful gas leakage, the contamination hazard to atmosphere and worker, and noise reduction effect improves exhaust-gas treatment comfortable working environment degree.
Description
Technical field
The invention belongs to technical field of waste gas treatment, and in particular, to a kind of height applied to exhaust-gas treatment air-line system
Air-tightness pipe fitting.
Background technique
Air hose used by exhaust treatment system generally selects PP corrosion-resistant, that weatherability is strong, PVC pipe, and PP, PVC
Pipe fitting is used for the drawbacks of air-line system and is that the cooperation of pipe fitting joint is unable to reach the air-tightness of metalwork, in actual production,
Often there is micro, a small amount of high pressure gas leakage at each connector of exhaust-gas treatment pipeline, such case but looked forward to mostly
Industry is ignored, and if processing gas is poisonous and harmful element, pollution and injury will be brought to environment and workers in enterprise, in addition, generally depositing
The situation to be improved for being exhaust treatment system further includes noise pollution caused by gas high-speed motion in air-line system.
Therefore, the above problem is urgently to be resolved.
Summary of the invention
Goal of the invention: for overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of high-air-tightness, low noise
The pipe fitting for exhaust-gas treatment air-line system.
Technical solution: the present invention provides a kind of high-air-tightness pipe fittings applied to exhaust-gas treatment air-line system, including wind
Pipe and the connector for connecting air hose, it is characterised in that: the air hose includes external tube layer and interior tube layer, the external tube layer and interior
It is equipped with hollow layer, the external tube layer and inner tube interlayer between tube layer and is axially arranged with several dowels along air hose, the connector includes interior
Connect layer and external layer, the inscribed layer and external interlayer are axially arranged with several connection ribs, the connection rib and inscribed layer along connector
With external interlayer formation hollow channel, the two ends of the inscribed layer and external layer are respectively symmetrically equipped with the first internal screw thread and second
External screw thread, tube layer end is equipped with the first external screw thread with the first screw-internal thread fit, air hose external tube layer end in the air hose
Equipped with the second internal screw thread cooperated with the second external screw thread.
The air-line system that air hose in above-mentioned technical proposal and connector are constituted, it is useless for conveying high-pressure in tube layer in air hose
Gas, that is, the leakage biggish junction of possibility, which occurs, is at the first internal screw thread and the first externally threaded cooperation, and frees gas herein
After body leakage, gas can enter to be continued to convey by the normal pressure hollow layer of interior tube layer and outer tube interlayer, and is based on normal pressure, outside second
The possibility leaked at the cooperation for the second internal screw thread being threadedly engaged is very little, therefore realizes crucial high-air-tightness effect
Fruit；Furthermore hollow wall air hose has the characteristics that reduce noise, realizes low noise, high airtight exhaust gas conveying.
Further, a kind of above-mentioned high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, it is characterised in that: institute
It states and is equipped with a circle sealing ring, when two air hoses are connected to connector, the inscribed layer end of two air hoses in the middle part of inscribed layer Nell wall
Head is resisted against sealing ring-side wall.
Sealing ring selects elastic material, and when two air hoses and connector are cooperatively connected, interior tube layer end is resisted against sealing ring-side wall,
It is further reduced the possibility that gas leakage is freeed at the first internal screw thread and the first externally threaded cooperation.
Further, a kind of above-mentioned high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, it is characterised in that: institute
It states the first internal screw thread and the first external screw thread is the buttress thread worked in coordination.
Buttress thread is compared with regular screw threads tooth, flank gapless, has higher air-tightness, and connector use is partially trapezoidal
Screw thread can bear relatively large load, improve the compression strength of connector.
Further, above-mentioned a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, it is characterised in that: the
One externally threaded one tooth of middle section is equipped with inclined for preventing the tooth height that gas leaks in air hose from being higher than other first externally threaded protrusions
Trapezoidal thread section.
The purpose of design of above structure is to be to exist in view of the first internal screw thread and the first externally threaded buttress thread tooth
Tooth top and bottom of the tooth subtle exhaust leak gap that may be present after cooperating are screwed, a tooth height is being arranged in the first externally threaded middle section
Slightly above other first externally threaded protrusion buttress threads can function well as airtight effect.
Further, a kind of above-mentioned high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, which is characterized in that institute
Stating has the helical wind-guiding muscle for being uniformly distributed protrusion in interior tube layer.
The purpose of design of helical wind-guiding muscle is to play the effect of air hose noise reduction based on air hose internal spiral silencing method.
Further, a kind of above-mentioned high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, which is characterized in that institute
The external tube layer for stating external tube layer and external layer is respectively arranged with the hex nut section being easily installed.
Hex nut section is easy to use conventional tool can Fast Installation pipe fitting.
Further, a kind of above-mentioned high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, which is characterized in that institute
Stating interior tube layer includes the foaming layer wrapped up outside solid wall layer and solid wall layer.
Air hose foaming layer structure has the effect of good sound-absorbing and sound insulation, and the noise reduction for further realizing air-line system is made
With.
Above-mentioned technical proposal can be seen that the invention has the following beneficial effects: one kind provided by the present invention to be applied to
The high-air-tightness pipe fitting of exhaust-gas treatment air-line system, the hollow layer structure matching design based on air hose and connector, realizes pipe fitting
High-air-tightness effect, reduce toxic and harmful gas leakage, the contamination hazard to atmosphere and worker, noise reduction effect improve exhaust gas at
Science and engineering makees environmental degree of comfort.
Detailed description of the invention
Fig. 1 is the air hose and connector matching structure schematic diagram of the embodiment of the present invention；
Fig. 2 is air hose schematic cross-section；
Fig. 3 is connector main view；
Fig. 4 is contact cross-section schematic diagram；
In figure: 1 air hose, 11 external tube layers, tube layer in 12,121 solid wall layers, 122 foaming layers, 13 hollow layers, 14 dowels, 2 connectors,
21 inscribed layers, 22 external layers, 23 connection ribs, 24 hollow channels, 3 first internal screw threads, 4 second external screw threads, 5 first external screw threads, 6 the
Two internal screw threads, 7 sealing rings, 8 helical wind-guiding muscle, 9 hex nut sections.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " clockwise ", " inverse
The orientation or positional relationship of the instructions such as hour hands " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two
It is a or more than two, unless otherwise restricted clearly.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Embodiment
A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system as shown in Figs 1-4, including air hose 1 and use
In the connector 2 of connection air hose 1, it is characterised in that: the air hose 1 includes external tube layer 11 and interior tube layer 12,11 He of external tube layer
It is equipped with hollow layer 13 between interior tube layer 12, is axially arranged with several dowels 14, institute along air hose 1 between the external tube layer 11 and interior tube layer 12
Stating connector 2 includes inscribed layer 21 and external layer 22, is axially arranged with several companies along connector 2 between the inscribed layer 21 and external layer 22
Rib 23 forms hollow channel 24, the inscribed layer 21 and external layer between the connection rib 23 and inscribed layer 21 and external layer 22
22 two ends are respectively symmetrically equipped with the first internal screw thread 3 and the second external screw thread 4, and 12 end of tube layer is equipped with and the in the air hose 1
First external screw thread 5 of one internal screw thread 3 cooperation, 1 external tube layer of air hose, 11 end are equipped in second cooperated with the second external screw thread 4
Screw thread 6.
Wherein, a circle sealing ring 7 is equipped in the middle part of 21 inner wall of inscribed layer, two air hoses 1 are connected to 2 both ends of connector
When, 21 end of inscribed layer of two air hoses 1 is resisted against 7 side wall of sealing ring.
Wherein, first internal screw thread 3 and the first external screw thread 5 are the buttress thread worked in coordination.
Wherein, one tooth of middle section of the first external screw thread 5 is equipped with for preventing the protrusion that gas leaks in interior tube layer 12 partially terraced
Shape thread segment, the protrusion buttress thread section tooth height are higher than other first external screw threads 5.
Wherein, there is the helical wind-guiding muscle 8 for being uniformly distributed protrusion on said inner tube layer 12.
Wherein, the outer wall of the external tube layer 11 and external layer 22 is respectively arranged with the hex nut being coupled convenient for pipe fitting
Section 9.
Wherein, said inner tube layer 12 includes the foaming layer 122 wrapped up outside solid wall layer 121 and solid wall layer 121.
When production, it is considered as between the first internal screw thread 3, the second external screw thread 4, the first external screw thread 5, the second internal screw thread 6 convenient for matching
It closes through the thread parameter that does not screw, in installation, should also be as by the leakage gas passage that hollow layer 13 and hollow channel 24 are constituted
It is connected with exhaust-gas treatment pipeline.
It is worth noting that, the fit structure of air hose described in technical solution of the present invention and connector can be completely applied to it
Fit structure between his pipe fitting and pipe fitting, such as air hose and elbow, air hose and concentric reducer, air hose and air-valve；In addition, can also English
The pipe fitting of language and other application occasion, such as water pipe system, tubing system.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement also should be regarded as of the invention
Protection scope.
Claims (7)
1. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system, including air hose (1) and for connecting air hose (1)
Connector (2), it is characterised in that: the air hose (1) includes external tube layer (11) and interior tube layer (12), the external tube layer (11) and interior
Hollow layer (13) are equipped between tube layer (12), along air hose (1) if being axially arranged with involvement between the external tube layer (11) and interior tube layer (12)
It connects muscle (14), the connector (2) includes inscribed layer (21) and external layer (22), edge between the inscribed layer (21) and external layer (22)
Connector (2) is axially arranged with several connection ribs (23), between the connection rib (23) and inscribed layer (21) and external layer (22) in formation
The two ends of empty channel (24), the inscribed layer (21) and external layer (22) are respectively symmetrically equipped with the first internal screw thread (3) and second
External screw thread (4), the interior tube layer of the air hose (1) (12) end are equipped with the first external screw thread (5) cooperated with the first internal screw thread (3), institute
It states air hose (1) external tube layer (11) end and is equipped with the second internal screw thread (6) cooperated with the second external screw thread (4).
2. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 1, it is characterised in that:
Circle sealing ring (7), when two air hoses (1) are connected to connector (2) both ends, two institutes are equipped in the middle part of inscribed layer (21) inner wall
Inscribed layer (21) end for stating air hose (1) is resisted against sealing ring (7) side wall.
3. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 1, it is characterised in that:
First internal screw thread (3) and the first external screw thread (5) are the buttress thread worked in coordination.
4. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 3, it is characterised in that:
One tooth of middle section of first external screw thread (5) is equipped with the protrusion buttress thread section for preventing the interior gas leakage of interior tube layer (12),
The protrusion buttress thread section tooth height is higher than other first external screw threads (5).
5. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 1, which is characterized in that
There is the helical wind-guiding muscle (8) for being uniformly distributed protrusion on said inner tube layer (12).
6. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 1, which is characterized in that
The outer wall of the external tube layer (11) and external layer (22) is respectively arranged with the hex nut section (9) being coupled convenient for pipe fitting.
7. a kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system according to claim 1, which is characterized in that
Said inner tube layer (12) includes the foaming layer (122) that solid wall layer (121) and solid wall layer (121) wrap up outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857869.6A CN108953785A (en) | 2018-07-31 | 2018-07-31 | A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857869.6A CN108953785A (en) | 2018-07-31 | 2018-07-31 | A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108953785A true CN108953785A (en) | 2018-12-07 |
Family
ID=64466752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810857869.6A Pending CN108953785A (en) | 2018-07-31 | 2018-07-31 | A kind of high-air-tightness pipe fitting applied to exhaust-gas treatment air-line system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108953785A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360402A (en) * | 2019-07-26 | 2019-10-22 | 袁洪金 | A kind of polypropylene anti-corrosion pipe fitting |
| CN111425675A (en) * | 2020-03-26 | 2020-07-17 | 刘成阜 | Hollow wall spiral silencing pipe and preparation method thereof |
| CN112145803A (en) * | 2020-09-25 | 2020-12-29 | 中建六局水利水电建设集团有限公司 | Construction method of thermal pipeline with on-site foamed heat-insulating layer |
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| CN103292073A (en) * | 2013-06-04 | 2013-09-11 | 无锡金顶石油管材配件制造有限公司 | Petroleum pipe end connector |
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2018
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| EP1436539B1 (en) * | 2001-10-19 | 2008-07-02 | Technip France SA | Bulkhead assembly for use in pipe-in-pipe systems |
| CN201568662U (en) * | 2009-09-27 | 2010-09-01 | 无锡西姆莱斯石油专用管制造有限公司 | Threading connector with three torque shoulders |
| CN202125258U (en) * | 2011-06-21 | 2012-01-25 | 杨林 | Oil sleeve connector with high sealing performance and thread-gluing resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360402A (en) * | 2019-07-26 | 2019-10-22 | 袁洪金 | A kind of polypropylene anti-corrosion pipe fitting |
| CN111425675A (en) * | 2020-03-26 | 2020-07-17 | 刘成阜 | Hollow wall spiral silencing pipe and preparation method thereof |
| CN112145803A (en) * | 2020-09-25 | 2020-12-29 | 中建六局水利水电建设集团有限公司 | Construction method of thermal pipeline with on-site foamed heat-insulating layer |
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Application publication date: 20181207 |
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