CN103322373A - Pressured plugging device for stolen hole of oil pipe - Google Patents
Pressured plugging device for stolen hole of oil pipe Download PDFInfo
- Publication number
- CN103322373A CN103322373A CN2013101035323A CN201310103532A CN103322373A CN 103322373 A CN103322373 A CN 103322373A CN 2013101035323 A CN2013101035323 A CN 2013101035323A CN 201310103532 A CN201310103532 A CN 201310103532A CN 103322373 A CN103322373 A CN 103322373A
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- plug
- wall
- plugging
- shutoff
- main cylinder
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- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 230000006837 decompression Effects 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 7
- 238000004080 punching Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 37
- 230000032258 transport Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
A pressured plugging device for a stolen hole of an oil pipe mainly comprises lever rods, a pin frame, an indicating pin, a fixing sleeve, a main cylinder, a ball valve, a grinding head, a pressure release valve, a hydraulic pressure gauge, a seal ring, a caliper shaft, a sleeve, a plugging shaft, a plug bolt, a plug nut, a rubber plugging plug, a plugging cap and the like, wherein the main cylinder is mounted on the ball valve; the fixing sleeve is mounted on the main cylinder; the plugging shaft for mounting the grinding head is screwed in through the fixing sleeve; the plug bolt penetrates the rubber plugging plug, and the upper end of the plug bolt is mounted with the plug nut; the plugging shaft penetrates the sleeve and is fixed by the lever rods; the sleeve is screwed in the fixing sleeve; the rubber plugging plug is mounted at the lower end of the plugging shaft; a short pipe is cut, devices are dismounted, the rubber plugging plug is covered by the cap, the plug nut is tightly clamped by the cap, and the cap is welded with the pipe. The device can calibrate and plug the stolen hole on the condition that the pressured pipeline transports without stop; the entire journey is sealed without the leaking of raw oils; the device is simple in structure and safe and convenient to use, and avoids the financial loss caused by the shutdown of the pipeline.
Description
Technical field
The present invention relates to a kind of oil transport pipeline blocking device, particularly a kind ofly under stop status, implement to steal hole non-stop plugging device without the oil transport pipeline that leaks shutoff at oil transport pipeline.
Background technique
Oil transport pipeline is the important means of oil transportation, and it relates to safely economic life line of the country.At present, the lawless person is commonplace in the phenomenon that oil transport pipeline punching, mounting ball valve carry out stolen, can repeat constantly to steal oil by ball valve.When carrying out shutoff for this type of robber hole on the oil transport pipeline, because the pressure of pipeline Crude Oil is too large, so when construction, must to will just can carry out shutoff after ducted crude oil shutdown, the pressure release first, the recovery required time of oil transportation is long from the pipe plugging to the pipeline, shutoff mode working efficiency such for long distance oil pipeline is low, constructs very inconvenient, and the stopping transportation of oil transport pipeline is huge to the loss that enterprise causes.
The scheme in shutoff oil transport pipeline robber hole mainly contains at present: the welding of ball valve upper cover cap and these two kinds of methods of embedding timber wedge in stealing the hole; Front a kind of method easily forms corrosion and not attractive in appearance in the protruding part, the chock that embeds pipeline in rear a kind of method can stop passing through of the interior rotating wash bowl of pipeline, above two kinds of methods all need pipeline shutdown, implement after the pressure release, and stopping transportation is huge to the oil play economic loss.
Summary of the invention
For the deficiencies in the prior art part, the present invention will provide a kind of oil delivering pipe road to steal hole non-stop plugging device, this oil transport pipeline is stolen hole non-stop plugging device and can not carried out shutoff to stealing the hole under the prerequisite of stopping transportation at oil transport pipeline, and omnidistance sealing is high when shutoff, the leakage of crude oil can not occur.
The technical solution adopted for the present invention to solve the technical problems is:
Oil transport pipeline steal hole non-stop plugging device mainly by: lever, punch block, pointer, fixed muffle, main cylinder, ball valve, bistrique, Decompression valves, hydralic pressure gauge, seal ring, calibrate axle, sleeve pipe, shutoff axle, plug screw, plug nut, rubber block head, plugging hood cap etc. and form.
The inner chamber of main cylinder is divided into upper and lower chamber, and upper end, lower end outer wall all have screw thread, are installed to the upper end of ball valve; Fixed muffle is cylindrical round steel, and body cavity is divided into two circular cylindrical cavities that diameter is different, and screw thread is arranged on the cavity inner wall, is installed on the main cylinder; Seal ring is fixed on the main cylinder epicoeloma madial wall, can hold tightly and calibrate axle or sleeve pipe, and the linear bearing of vertical direction is arranged on the seal ring inwall; Decompression valves is installed to the bottom of main drum outer wall, is communicated with the pressure that is used for releasing in the main cylinder with the hypocoelom of main cylinder; Hydralic pressure gauge is installed in the bottom of main drum outer wall, is communicated with the hypocoelom of main cylinder, is used for showing the interior pressure of main cylinder; Calibrating axle is that the outer wall upper end has screw thread and through hole, the cylindrical body steel that rear surface is smooth, and the bottom body cavity is bistrique fixedly, screws in from fixed muffle when bore dia is stolen in survey, and insert in the seal ring of main cylinder the bottom, and rotating lever passes through fixed muffle chamber internal thread to lower feeding; Bistrique, for there is knurling on the surface and scribbles the cone-shaped metal bistrique of paint, the upper end is large end, and the lower end be most advanced and sophisticated, and it is also air-dry that the surface is coated with full paint, is installed to the bottom of calibrating axle; Rubber plug is the little cylindrical body of the large lower diameter of upper diameter, and there is annular groove the plug upper-end surface, is installed to casing shoe; Sleeve pipe, for screw thread and through hole, the smooth steel pipe in outer wall lower end are arranged on the outer wall, there is the annular groove of fastening rubber plug the bottom, and sleeve pipe screws in the fixed muffle; Shutoff axle, top have two through holes, and there is the fixedly body cavity of plug the bottom, is fixed in the sleeve pipe during shutoff; The plug screw, outer wall is smooth, and there is screw thread the upper end, and there is the projection with rubber plug bottom equal diameters the lower end, passes rubber plug; The plug nut, inwall has screw thread, and outer wall punching is installed on the plug screw and is fixed in the chamber of shutoff axle lower end; Punch block is installed in the upper end of shutoff axle and sleeve pipe, and the other end is installed pointer; The plugging hood cap is steel cover cap, chucking shutoff nut, and body cavity compresses rubber shutoff plug, and the bottom surface cambered surface is close to the oil transportation tube wall.
The present invention has beneficial following effect: when 1, the present invention stole the hole shutoff to underground oil transport pipeline, the soil was without excavation face, and plugging device is directly installed on the ball valve; 2, the seal ring in the main cylinder of the present invention, so that calibrate the measurement of under condition with pressure, stealing the aperture, hole and the shutoff of stealing the hole, good airproof performance, without the leakage of crude oil; 3, the present invention uses the plugging hood cap with the capping of rubber shutoff plug, welding, good sealing effect; 4, of the present invention simple in structure, be easy to disassembly and assembly transportations, use safe, easy.
Description of drawings
Fig. 1 is that oil transport pipeline robber of the present invention hole non-stop plugging device is measured the generalized section when stealing the aperture, hole.
Generalized section when Fig. 2 is oil transport pipeline robber hole non-stop plugging device shutoff robber of the present invention hole.
Generalized section when Fig. 3 is the non-stop plugging device plugging hood cap welding shutoff of oil transport pipeline robber of the present invention hole.
1. lever, 2. punch block, 3. pointer, 4. fixed muffle, 5. lead cylinder, 6. ball valve, 7. short tube, 8. bistrique, 9. Decompression valves, 10. hydralic pressure gauge, 11. seal rings, 12. calibrate axle, 13. oil transport pipeline, 14. sleeve pipes, 15. shutoff axles, 16. the plug screw, 17. plug nuts, 18. levers, 19. lever, 20. rubber plugs, 21. plugging hood caps
Embodiment
By reference to the accompanying drawings 1 to accompanying drawing 3 and embodiment the present invention is further detailed explanation.
Oil transport pipeline of the present invention steals hole non-stop plugging device, mainly by lever 1, punch block 2, pointer 3, fixed muffle 4, main cylinder 5, bistrique 8, Decompression valves 9, hydralic pressure gauge 10, seal ring 11 is calibrated axle 12, sleeve pipe 14, shutoff axle 15, plug screw 16, plug nut 17, lever 18, lever 19, rubber plug 20, plugging hood cap 21 forms, and it is characterized in that:
The inner chamber of main cylinder 5 is divided into upper and lower chamber, and upper end, lower end outer wall all have screw thread, are installed to the upper end of ball valve 6; Fixed muffle 4 is cylindrical round steel, and body cavity is divided into two circular cylindrical cavities that diameter is different, and screw thread is arranged on the cavity inner wall, is installed on the main cylinder 5; Seal ring 11 is fixed on the main cylinder 5 epicoeloma madial walls, can hold tightly and calibrate axle 12 or sleeve pipe 14, and the linear bearing of vertical direction is arranged on seal ring 11 inwalls; Decompression valves 9 is installed to the bottom of main cylinder 5 outer walls, is communicated with the pressure that is used for releasing in the main cylinder 5 with the hypocoelom of main cylinder 5; Hydralic pressure gauge 10 is installed in the bottom of main cylinder 5 outer walls, is communicated with the hypocoelom of main cylinder 5, is used for showing the pressure that main cylinder 5 is interior; Calibrate axle 12 and for the outer wall upper end screw thread and through hole are arranged, the cylindrical body steel that rear surface is smooth, the bottom body cavity is bistrique 8 fixedly, surveys when stealing bore dia to screw in from fixed muffle 4, insert in the seal ring 11 of main cylinder 5 bottom, and rotating lever 1 passes through fixed muffle 4 chamber internal threads to lower feeding; Bistrique 8, for there is knurling on the surface and scribbles the cone-shaped metal bistrique of paint, the upper end is large end, and the lower end be most advanced and sophisticated, and it is also air-dry that the surface is coated with full paint, is installed to the bottom of calibrating axle 12; Rubber plug 20 is the little cylindrical body of the large lower diameter of upper diameter, and there is annular groove the plug upper-end surface, is installed to sleeve pipe 14 bottoms; Sleeve pipe 14, for screw thread and through hole, the smooth steel pipe in outer wall lower end are arranged on the outer wall, there is the annular groove of fastening rubber plug 20 bottom, and sleeve pipe 14 screws in the fixed muffles 4; Shutoff axle 15, top have two through holes, and there is the fixedly body cavity of plug the bottom, are fixed on during shutoff in the sleeve pipe 14; Plug screw 16, outer wall is smooth, and there is screw thread the upper end, and there is the projection with rubber plug 20 bottom equal diameters the lower end, passes rubber plug 20; Plug nut 17, inwall has screw thread, and outer wall punching is installed on the plug screw 16 and is fixed in the chamber of shutoff axle 15 lower ends; Punch block 2 is installed in the upper end of shutoff axle 15 and sleeve pipe 14, and the other end is installed pointer 3; Plugging hood cap 21 is steel cover cap, chucking shutoff nut, and body cavity compresses rubber shutoff plug, and the bottom surface cambered surface is close to the oil transportation tube wall.
Working principle of the present invention and working procedure are:
The lawless person is welded on short tube 7 on the oil transport pipeline 13 when stolen, and at short tube 7 dress ball valves 6, then at ball valve 6 perforating device being installed punches, steal for a long time oil by at ball valve 6 flexible pipe being installed after the punching, the main pin of this plugging device carries out the behavior of long-term stolen at oil transport pipeline punching mounted valve.
Because all be the drill bit of employing standard during stolen molecule drilling hole of oil stolen, in order to satisfy the robber hole in the multiple aperture of shutoff, described rubber shutoff plug 2 is different according to bit diameter, makes in advance the rubber plug 20 of multiple diameter.
At first, to lead cylinder 5 is installed on the ball valve 6, fixed muffle 4 is installed on the main cylinder 5, bistrique 8 is installed in the body cavity of calibrating axle 12 lower ends, and be screwed, pointer 3 is installed on the punch block 2, punch block 2 is installed to calibrates on the axle 12, the through hole of axle 12 upper ends is calibrated in lever 1 insertion, the axle 12 of calibrating that installs bistrique 8 is inserted from fixed muffle 4 upper ends, after the threaded engagement of the screw thread of calibrating axle 12 outer walls and fixed muffle 4 inwalls, drive by lever 1 and calibrate axle 12 to lower feeding, can indicate bistrique 8 to enter the degree of depth of main cylinder 5 by pointer 3, when bistrique 8 enters into ball valve 6 and not yet pushes up the valve that arrives ball valve 6, spanner by ball valve 6 is with valve open, calibrate axle 12 by lever 1 drive and rotate continuation to lower feeding, until the robber hole that bistrique 8 pushes up on the oil transport pipeline 13, lever 1 feeding, withdraw from three times, so that steal hole wall the dry paint on the bistrique 8 is ground off, will calibrate axle 12 and screw out, by pointer 3 indications, just withdrawed from the valve of ball valve 6 when bistrique 8, with valve closing, screw out and calibrate axle 12, the cleaning oil pollution on the bistrique 8 is clean, by the polishing scratch on the bistrique 8, measure the diameter of stealing the hole with the vernier calliper ulnar side.
Again, shutoff screw 16 is inserted from rubber plug 20 lower ends, shutoff nut 17 screws off and compresses rubber plug 20 from shutoff screw 16 upper ends, shutoff nut 17 is fixed in the cavity of shutoff axle 15 lower ends, the annular of sleeve pipe 14 lower ends is told groove to be inserted in the annular groove in the rubber plug 20 and chucking, this moment, the through hole of sleeve pipe 14 and shutoff axle 15 upper ends alignd, by lever 18 both are fixed, mounted sleeve pipe 14 is inserted from fixed muffle 4 upper ends, rotating lever 18 so that sleeve pipe 14 under the internal thread interlock of fixed muffle 4 to lower feeding, indication by pointer 3, before entering into ball valve 6 and do not push up valve, rubber plug 20 opens ball valve 6, by lever 18 so that sleeve pipe 14 continue to lower feeding, until rubber plug 20 hold out against can not be to lower feeding on the oil transport pipeline 13, open Decompression valves 9 and release inner pressure, when being zero, hydralic pressure gauge 10 pressure close Decompression valves 9, if the registration of hydralic pressure gauge 10 remains 0 expression and steals the hole by jam-pack, if hydralic pressure gauge 10 has registration, repeat above operation, lever 18 is taken away, rotating lever 19, driving shutoff axle 15 rotates, shutoff axle 15 drives shutoff nut 17 and rotates, thereby will carry on the shutoff screw 16 so that rubber plug 20 expands, thereby will steal the complete shutoff in hole, cut off and plugging device is pulled down from short tube 7, only have shutoff nut 17 on transport pipe 13 surfaces, shutoff screw 16, rubber plug 20 this moment.
At last, plugging hood cap 21 is covered rubber plug 20 and tightens shutoff nut 17, and plugging hood cap 21 ground are cambered surface, are close to oil transport pipeline 13, plugging hood cap 21 is welded on oil transport pipeline 13 surfaces, and the shutoff that realizes the robber hole is welded in plugging hood cap 21 and shutoff nut 17 contacting points.
Claims (4)
1. an oil transport pipeline is stolen hole non-stop plugging device, it is characterized in that comprising:
Main cylinder, inner chamber is divided into upper and lower chamber, and upper end, lower end outer wall all have screw thread, are installed in the upper end of ball valve;
Seal ring is fixed on the main cylinder epicoeloma madial wall, can hold tightly and calibrate axle or sleeve pipe, and the linear bearing of vertical direction is arranged on the seal ring inwall;
Decompression valves is installed in the bottom of main drum outer wall, is communicated with the hypocoelom of main cylinder;
Hydralic pressure gauge is installed in the bottom of main drum outer wall, is communicated with the hypocoelom of main cylinder;
Fixed muffle is cylindrical round steel, and body cavity is divided into two circular cylindrical cavities that diameter is different, and screw thread is arranged on the cavity inner wall;
Calibrate axle, for there are screw thread and through hole, the cylindrical body steel that rear surface is smooth in the outer wall upper end, there is the fixedly body cavity of bistrique the bottom, screw in from fixed muffle when bore dia is stolen in survey, insert in the seal ring of main cylinder the bottom, and rotating lever passes through fixed muffle chamber internal thread to lower feeding;
Bistrique, for there is knurling on the surface and scribbles the cone-shaped metal bistrique of paint, the upper end is large end, and the lower end be most advanced and sophisticated, and it is also air-dry that the surface is coated with full paint, is installed in the bottom of calibrating axle during work;
Rubber plug is the little cylindrical body of the large lower diameter of upper diameter, and there is annular groove the plug upper-end surface;
Sleeve pipe, for screw thread and through hole, the smooth steel pipe in outer wall lower end are arranged on the outer wall, there is the annular groove of fastening rubber plug the bottom;
Shutoff axle, top have two through holes, and there is the fixedly body cavity of plug the bottom, is fixed in the sleeve pipe during shutoff;
The plug screw, outer wall is smooth, and there is screw thread the upper end, and there is the projection with rubber plug bottom equal diameters the lower end.
2. oil transport pipeline according to claim 1 is stolen hole non-stop plugging device, and it is characterized in that: also comprise the plug nut, the plug nut inner wall has screw thread, the outer wall punching.
3. oil transport pipeline according to claim 1 is stolen hole non-stop plugging device, it is characterized in that: comprise that also pointer, punch block are installed in the upper end of shutoff axle and sleeve pipe, the other end is installed pointer.
4. oil transport pipeline according to claim 1 is stolen hole non-stop plugging device, it is characterized in that: also comprise the plugging hood cap, for steel cover cap, can tighten the shutoff nut, body cavity compresses rubber shutoff plug, and the bottom surface is the cambered surface of being close to the oil transportation tube wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101035323A CN103322373A (en) | 2013-03-15 | 2013-03-15 | Pressured plugging device for stolen hole of oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101035323A CN103322373A (en) | 2013-03-15 | 2013-03-15 | Pressured plugging device for stolen hole of oil pipe |
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| Publication Number | Publication Date |
|---|---|
| CN103322373A true CN103322373A (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101035323A Pending CN103322373A (en) | 2013-03-15 | 2013-03-15 | Pressured plugging device for stolen hole of oil pipe |
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| CN (1) | CN103322373A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104075071A (en) * | 2014-07-01 | 2014-10-01 | 大连福佳·大化石油化工有限公司 | Air cooler tapping leakage stopper |
| CN105465525A (en) * | 2015-12-25 | 2016-04-06 | 中国石油化工股份有限公司 | Double-stroke valve picking tool with pressure |
| CN108087652A (en) * | 2018-02-06 | 2018-05-29 | 钦州学院 | Ship submarine pipeline air heave type device for plugging |
| CN108105521A (en) * | 2018-02-06 | 2018-06-01 | 钦州学院 | Combined joint based on ship |
| CN108105526A (en) * | 2018-02-06 | 2018-06-01 | 钦州学院 | Ship submarine pipeline device for plugging |
| GR20170100032A (en) * | 2017-01-25 | 2018-10-22 | Αλεξανδρος Δημητριου Μπακαλης | Anti-leak plug |
| CN109000955A (en) * | 2018-09-06 | 2018-12-14 | 河南中托力合化学有限公司 | A kind of pipeline sampling apparatus |
| CN112228778A (en) * | 2020-10-10 | 2021-01-15 | 天长市志昊机电配件有限公司 | Blowout prevention and disassembly prevention pressure gauge valve |
| CN114017934A (en) * | 2021-09-17 | 2022-02-08 | 中材(北京)地热能科技有限公司 | Tube bottom self-sealing device of coaxial sleeve heat exchanger |
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| CN2752585Y (en) * | 2004-11-10 | 2006-01-18 | 中国石油化工股份有限公司 | Multi-functional quick plugging device |
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| CN202708460U (en) * | 2012-05-05 | 2013-01-30 | 青岛科技大学 | Device for plugging stealing hole in petroleum transmission pipeline under pressure |
| CN203147154U (en) * | 2013-03-15 | 2013-08-21 | 青岛科技大学 | Under-pressure plugging device of stealing hole of oil transportation pipeline |
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2013
- 2013-03-15 CN CN2013101035323A patent/CN103322373A/en active Pending
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| CN2752585Y (en) * | 2004-11-10 | 2006-01-18 | 中国石油化工股份有限公司 | Multi-functional quick plugging device |
| DE102004055732A1 (en) * | 2004-11-18 | 2006-06-01 | Beate Baust und Hans-Michael Rößler GbR (vertretungsberechtigte Gesellschafterin Frau Beate Baust, Dahlienweg 20, 68775 Ketsch) | Method for sealing of leaks in pipes, passages, channels or containers entails inserting of sealing element with diameter smaller or same as diameter of leak and tensioning sealing element against wall of leak |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104075071A (en) * | 2014-07-01 | 2014-10-01 | 大连福佳·大化石油化工有限公司 | Air cooler tapping leakage stopper |
| CN105465525A (en) * | 2015-12-25 | 2016-04-06 | 中国石油化工股份有限公司 | Double-stroke valve picking tool with pressure |
| CN105465525B (en) * | 2015-12-25 | 2017-09-19 | 中国石油化工股份有限公司 | Two-pass is with pressure to pluck valve instrument |
| GR20170100032A (en) * | 2017-01-25 | 2018-10-22 | Αλεξανδρος Δημητριου Μπακαλης | Anti-leak plug |
| GR1009701B (en) * | 2017-01-25 | 2020-02-06 | Αλεξανδρος Δημητριου Μπακαλης | Anti-leak plug |
| CN108087652A (en) * | 2018-02-06 | 2018-05-29 | 钦州学院 | Ship submarine pipeline air heave type device for plugging |
| CN108105526A (en) * | 2018-02-06 | 2018-06-01 | 钦州学院 | Ship submarine pipeline device for plugging |
| CN108105521A (en) * | 2018-02-06 | 2018-06-01 | 钦州学院 | Combined joint based on ship |
| CN108105521B (en) * | 2018-02-06 | 2023-12-29 | 钦州学院 | Pipeline plugging device based on ship |
| CN109000955A (en) * | 2018-09-06 | 2018-12-14 | 河南中托力合化学有限公司 | A kind of pipeline sampling apparatus |
| CN112228778A (en) * | 2020-10-10 | 2021-01-15 | 天长市志昊机电配件有限公司 | Blowout prevention and disassembly prevention pressure gauge valve |
| CN114017934A (en) * | 2021-09-17 | 2022-02-08 | 中材(北京)地热能科技有限公司 | Tube bottom self-sealing device of coaxial sleeve heat exchanger |
| CN114017934B (en) * | 2021-09-17 | 2024-04-19 | 中材(北京)地热能科技有限公司 | Self-sealing device for bottom of coaxial double-pipe heat exchanger |
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Application publication date: 20130925 |