CN115289386A - Temperature deformation compensation device for low-temperature liquid oxygen manhole - Google Patents
Temperature deformation compensation device for low-temperature liquid oxygen manhole Download PDFInfo
- Publication number
- CN115289386A CN115289386A CN202210959430.0A CN202210959430A CN115289386A CN 115289386 A CN115289386 A CN 115289386A CN 202210959430 A CN202210959430 A CN 202210959430A CN 115289386 A CN115289386 A CN 115289386A
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- Prior art keywords
- positioning
- ring
- manhole
- low
- face
- Prior art date
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/06—Closures, e.g. cap, breakable member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/013—Single phase liquid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention provides a temperature deformation compensation device for a low-temperature liquid oxygen manhole, which comprises a connecting cylinder, a sealing cover and a fixing component, wherein the upper end surface of the connecting cylinder is provided with a limit groove; the compensation mechanism comprises a compensation ring which is arranged on the bottom wall of the limit groove and is sleeved on the opening of the through groove through an inner ring surface, a limit block which is arranged in the limit groove in a penetrating way, and an extension block which is arranged on the upper end surface of the sealing cover close to the connecting cylinder, wherein the thickness of the extension block is less than one fourth of the thickness of the compensation ring; the invention can conveniently plug the gap appearing at low temperature and improve the sealing performance of the pressure container.
Description
Technical Field
The invention relates to the technical field of manhole compensation, in particular to a temperature deformation compensation device for a low-temperature liquid oxygen manhole.
Background
The movable pressure container is widely applied to the fields of petroleum and chemical industry, aerospace industry, medical treatment, daily life and the like, and has the characteristics of large loading capacity, flexible transportation means, low transportation cost and the like. Mobile pressure vessels can be divided into three major categories, namely rail tank cars, tank cars and tank containers.
In a mobile pressure vessel, a manhole is an important component, which is installed on the top of the tank body for charging and maintenance.
In the existing manhole structure, after a hole is formed in a barrel body of a pressure container, a manhole reinforcing plate is welded to the outer side of the barrel body in an attaching mode; and then a manhole ring plate, a manhole cover plate, a sealing ring and the like are installed to be fixed on the cylinder body. It has the problem that when pressure vessel is being equipped with low temperature material, for example liquid oxygen, because the imperial device can make pressure vessel itself be in the low temperature state, the state of shrink can appear in pressure vessel itself this moment, and wherein the manhole device that sets up in pressure vessel trompil department receives microthermal influence great, can appear the condition that the gap appears in sealed department this moment, leads to the sealed effect of device to reduce, and the condition of leaking appears in low temperature material even.
Disclosure of Invention
Aiming at the technical problems, the invention provides the temperature deformation compensation device for the low-temperature liquid oxygen manhole, which can conveniently plug the gap at low temperature and improve the sealing performance of the pressure container.
In order to achieve the purpose, the invention provides the following technical scheme: a temperature deformation compensation device for a low-temperature liquid oxygen manhole comprises a connecting cylinder, a sealing cover and a fixing assembly, wherein a limiting groove is formed in the upper end face of the connecting cylinder, one end of the sealing cover is rotatably connected with the connecting cylinder, the fixing assembly is arranged on the sealing cover and on the side face of the connecting cylinder, a through groove is formed in the bottom wall of the limiting groove, and a compensation mechanism is arranged on the limiting groove;
the compensation mechanism is located including locating on the spacing slot diapire and through interior annular surface cover link up the compensating ring on the groove opening, wear to locate spacing piece in the spacing slot and locate the closing cap and close on the extension piece on the connecting cylinder up end, the thickness of extension piece is less than the quarter of compensating ring.
Preferably, the side of the connecting cylinder is provided with a first connecting block at a position close to the upper end face, and the first connecting block is rotatably connected with the sealing cover through a second connecting block.
Preferably, the fixing component comprises two positioning blocks which are respectively arranged on the side surfaces of the sealing cover and the connecting cylinder, are far away from the first connecting block and the second connecting block and are parallel to each other, positioning nuts which are rotatably arranged on the end surfaces of the positioning blocks and are arranged in rotating grooves, and positioning screws which can be in threaded connection with the two positioning nuts.
Preferably, the limiting block is cylindrical, and a plurality of clamping blocks arranged along the axis direction of the limiting block are arranged on the side surface of the limiting block in a circumferential array manner; and a plurality of clamping grooves which are in one-to-one correspondence with and matched with the clamping blocks are formed in the inner wall of the limiting groove.
Preferably, the lower end face of the compensation ring is provided with a positioning ring for positioning, and the positioning ring is matched with a positioning groove formed in the bottom wall of the limiting groove.
Preferably, the upper end surface of the compensation ring is provided with connecting rings with different sizes at positions close to the inner ring surface and the outer ring surface respectively, and the connecting rings are matched with connecting grooves formed in the lower end surface of the limiting block.
Preferably, the lower end face of the limiting block is provided with two air extraction mechanisms between the two connecting grooves.
The invention has the beneficial effects that: at first through set up the compensating ring on the outside that is located through the groove at spacing groove diapire, the rethread stopper is worn to locate the spacing inslot and is fixed compensating ring, and cover on the stopper through rotating the closing cap, fix the position of closing cap and connecting cylinder through fixed subassembly, so that fix the position of stopper at the spacing inslot, wherein the closing cap is provided with the extension piece on closing on the terminal surface of connecting cylinder, thereby be convenient for be fixed in the spacing inslot with stopper and compensating ring tightly, so that compensate when the device appears contracting under being in low temperature state, can be convenient carry out the shutoff to the gap that the low temperature appears through the compensating ring, pressure vessel's sealing performance has been improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
fig. 1 is a schematic view of a simple structure of a temperature deformation compensation device for a low-temperature liquid oxygen manhole according to the present invention.
Fig. 2 is a schematic view of an opening structure of the low-temperature liquid oxygen manhole temperature deformation compensation device provided by the invention.
Fig. 3 is a schematic view of an expanded structure of the temperature deformation compensation device for a low-temperature liquid oxygen manhole provided by the invention.
Fig. 4 is a schematic diagram of the stop block structure of the present invention.
Figure 5 is a schematic view of a connector barrel and compensating ring configuration of the present invention.
In the figure: 1. a connecting cylinder; 2. sealing the cover; 3. a first connection block; 4. a second connecting block; 5. positioning blocks; 6. positioning a nut; 7. a control block; 8. positioning a screw rod; 9. a stretching block; 10. a limiting groove; 11. a card slot; 12. a limiting block; 13. a clamping block; 14. a through groove; 15. a connecting ring; 16. a compensation ring; 17. and (6) positioning a groove.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the invention, and not all embodiments are provided. Other embodiments obtained by persons skilled in the art without making creative efforts based on the embodiments in the implementation belong to the protection scope of the invention.
Referring to fig. 1-5, a temperature deformation compensation device for a low-temperature liquid oxygen manhole comprises a connecting cylinder 1, a sealing cover 2 and a fixing component, wherein a limit groove 10 is formed in the upper end face of the connecting cylinder 1, one end of the sealing cover 2 is rotatably connected with the connecting cylinder 1, the fixing component is arranged on the sealing cover 2 and opposite to the side face of the connecting cylinder 1, a through groove 14 is formed in the bottom wall of the limit groove 10, and a compensation mechanism is arranged on the limit groove 10;
the compensation mechanism comprises a compensation ring 16, a limiting block 12 and an extension block 9, wherein the compensation ring 16 is arranged on the bottom wall of the limiting groove 10 and sleeved on an opening of the through groove 14 through an inner annular surface, the limiting block 12 penetrates through the limiting groove 10, the extension block 9 is arranged on the upper end face, close to the connecting cylinder 1, of the sealing cover 2, and the thickness of the extension block 9 is smaller than one fourth of that of the compensation ring 16.
As shown in fig. 1-5, at first, the compensating ring 16 is arranged on the bottom wall of the limiting groove 10, the limiting block 12 is arranged in the limiting groove 10 in a penetrating manner to fix the position of the compensating ring 16, the compensating ring 16 is prevented from moving, the situation that the sealing performance is reduced is avoided, the limiting block 12 is covered by rotating the sealing cover 2, the limiting block 12 is convenient to be fixed in the limiting groove 10, the sealing cover 2 is close to the extension block 9 on the upper end face of the connecting cylinder 1 so that the position of the compensating ring 16 in the limiting groove 10 can be tightly fixed and attached to the bottom wall of the limiting groove 10 through the limiting block 12, the sealing performance of the device is ensured, gaps which are generated at low temperature can be conveniently blocked, and the sealing performance of the pressure container is improved.
The position that the connecting cylinder 1 side is close to the up end is provided with first connecting block 3, and first connecting block 3 rotates with closing cap 2 through second connecting block 4 and is connected.
The fixing component comprises two positioning blocks 5 which are respectively arranged on the side surfaces of the sealing cover 2 and the connecting cylinder 1, far away from the positions of the first connecting block 3 and the second connecting block 4 and are parallel to each other, positioning nuts 6 which are rotatably arranged on the end surfaces of the positioning blocks 5 and are arranged in rotating grooves, and positioning screws 8 which can be in threaded connection with the two positioning nuts 6.
As shown in fig. 1-3 and fig. 5, when the sealing cap 2 is covered on the upper end surface of the connecting cylinder 1, the positioning screw 8 passes through the two positioning nuts 6 and is in threaded connection with the positioning nuts 6, wherein a rotating rod with a thickness greater than the thickness 6 of the positioning nuts is arranged on the top end of the positioning screw 8, and a control block 7 is arranged on the rotating rod, so that the positioning screw 8 is in threaded connection with the positioning nuts 6 by the rotation of the control block 7, when the positioning nuts 6 arranged on the sealing cap 2 move to the positions of the rotating rod, the positioning nuts 6 arranged on the sealing cap 2 are not in threaded connection with the rotating rod, so that the positioning screw 8 is in threaded connection with the positioning nuts 6 arranged on the connecting cylinder 1, so that the sealing cap 2 is tightly fixed on the connecting cylinder 1 under the condition that the positioning screw 8 rotates, and the limiting block 12 and the compensation ring 16 are conveniently fixed in the limiting groove 10.
The limiting block 12 is cylindrical, and a plurality of clamping blocks 13 arranged along the axis direction of the limiting block 12 are arranged on the side surface of the limiting block 12 in a circumferential array manner; the inner wall of the limiting groove 10 is provided with a plurality of clamping grooves 11 which are in one-to-one correspondence and match with the clamping blocks 13.
As shown in fig. 3, the position of the limiting block 12 in the limiting groove 10 is conveniently limited and fixed by the fixture block 13 entering the fixture groove 11, so that the situation that the limiting block 12 rotates in the limiting groove 10 to cause the compensation ring 16 to move or wear in the limiting groove 10 is avoided, and the sealing performance of the device is improved.
The lower end face of the compensating ring 16 is provided with a positioning ring for positioning, and the positioning ring is matched with a positioning groove 17 arranged on the bottom wall of the limiting groove 10.
As shown in fig. 5, the position of the positioning ring in the limiting groove 10 can be further limited by the positioning ring, so that the position of the compensating ring 16 in the limiting groove 10 is prevented from moving, so as to ensure that the position of the compensating ring 16 in the limiting groove 10 moves, so that when the device is in a low-temperature state, and parts of the device shrink, gaps can be generated between the parts of the device, the gaps can be conveniently plugged by the compensating ring 16, the gaps generated at low temperature can be conveniently plugged, and the sealing performance of the pressure container is improved.
Wherein the compensating ring 16 can be made of rubber material, thereby facilitating the ductility of the compensating ring 16, and when a gap occurs between the device components, the gap is compensated and blocked by the compensating ring 16, thereby facilitating the improvement of the sealing performance of the device.
The upper end surface of the compensation ring 16 is provided with connecting rings 15 with different sizes at positions close to the inner ring surface and the outer ring surface respectively, and the connecting rings 15 are matched with connecting grooves formed in the lower end surface of the limiting block 12.
As shown in fig. 5, the connection ring 15 facilitates fixing the positions of the connection cylinder 1, the compensation ring 16 and the stopper 12.
An air extraction mechanism located between the two connecting grooves is arranged on the lower end face of the limiting block 12.
As shown in fig. 1-5, the air between the two connection rings 15 is pumped by the air pumping mechanism to make the compensation ring 16 and the limiting block 12 in a negative pressure state, so that the position between the compensation ring 16 and the limiting block 12 is fixed, a gap at low temperature can be conveniently sealed, and the sealing performance of the pressure container is improved.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A temperature deformation compensation device for a low-temperature liquid oxygen manhole comprises a connecting cylinder (1) with a limiting groove (10) formed in the upper end face, a sealing cover (2) with one end rotatably connected with the connecting cylinder (1), and a fixing assembly arranged on the sealing cover (2) and on the side face of the connecting cylinder (1) in a relative position, and is characterized in that a through groove (14) is formed in the bottom wall of the limiting groove (10), and a compensation mechanism is arranged on the limiting groove (10);
the compensating mechanism is including locating on spacing groove (10) diapire and locating through interior annular surface cover run through compensation ring (16) on groove (14) opening, wear to locate stopper (12) in spacing groove (10) and locate closing cap (2) and close on extension piece (9) on connecting cylinder (1) up end, the thickness of extension piece (9) is less than the quarter of compensation ring (16).
2. The device for compensating the temperature deformation of the low-temperature liquid oxygen manhole according to claim 1, wherein: the connecting cylinder is characterized in that a first connecting block (3) is arranged at a position, close to the upper end face, of the side face of the connecting cylinder (1), and the first connecting block (3) is rotatably connected with the sealing cover (2) through a second connecting block (4).
3. The device for compensating the temperature deformation of the low-temperature liquid oxygen manhole according to claim 2, wherein: the fixing assembly comprises two positioning blocks (5) which are respectively arranged on the side surfaces of the sealing cover (2) and the connecting cylinder (1) and far away from the first connecting block (3) and the second connecting block (4) and are parallel to each other, positioning nuts (6) which are rotatably arranged on the end surfaces of the positioning blocks (5) and are arranged in rotating grooves, and positioning screw rods (8) which can be in threaded connection with the positioning nuts (6).
4. The temperature deformation compensation device for the low-temperature liquid oxygen manhole as claimed in claim 1, wherein: the limiting block (12) is cylindrical, and a plurality of clamping blocks (13) arranged along the axial direction of the limiting block (12) are arranged on the side surface of the limiting block (12) in a circumferential array manner; and a plurality of clamping grooves (11) which correspond to and match with the clamping blocks (13) one to one are formed in the inner wall of the limiting groove (10).
5. The temperature deformation compensation device for the low-temperature liquid oxygen manhole as claimed in claim 1, wherein: the lower end face of the compensation ring (16) is provided with a positioning ring for positioning, and the positioning ring is matched with a positioning groove (17) formed in the bottom wall of the limiting groove (10).
6. The temperature deformation compensation device for the low-temperature liquid oxygen manhole as claimed in claim 5, wherein: the upper end face of the compensation ring (16) is provided with connecting rings (15) with different sizes at positions close to the inner ring face and the outer ring face respectively, and the connecting rings (15) are matched with connecting grooves formed in the lower end face of the limiting block (12).
7. The device for compensating the temperature deformation of the low-temperature liquid oxygen manhole according to claim 6, wherein: and an air extraction mechanism positioned between the two connecting grooves is arranged on the lower end face of the limiting block (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210959430.0A CN115289386A (en) | 2022-08-10 | 2022-08-10 | Temperature deformation compensation device for low-temperature liquid oxygen manhole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210959430.0A CN115289386A (en) | 2022-08-10 | 2022-08-10 | Temperature deformation compensation device for low-temperature liquid oxygen manhole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115289386A true CN115289386A (en) | 2022-11-04 |
Family
ID=83827248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210959430.0A Pending CN115289386A (en) | 2022-08-10 | 2022-08-10 | Temperature deformation compensation device for low-temperature liquid oxygen manhole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115289386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115638369A (en) * | 2022-12-23 | 2023-01-24 | 江苏皓宇特种设备制造有限公司 | Boiler pressure vessel with anti-leakage structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003095382A (en) * | 2001-09-25 | 2003-04-03 | Ishikawajima Harima Heavy Ind Co Ltd | Tank manhole structure |
| CN101382235A (en) * | 2007-09-04 | 2009-03-11 | 八千代工业株式会社 | Sealing structure for high-pressure container |
| CN206055187U (en) * | 2016-07-02 | 2017-03-29 | 宁波镇洋化工发展有限公司 | Chlorine Buffer Vessel |
| CN110285315A (en) * | 2019-05-28 | 2019-09-27 | 江阴市富仁高科股份有限公司 | A kind of high-pressure hydrogen storage of the both ends with sealing structure |
| CN210601018U (en) * | 2019-05-28 | 2020-05-22 | 江阴市富仁高科股份有限公司 | High-pressure hydrogen storage container with sealing structures at two ends |
| CN211282269U (en) * | 2019-12-13 | 2020-08-18 | 湖北华特专用设备有限公司 | One-key manhole cover with double safety devices for road transportation tank type vehicle |
| CN114183690A (en) * | 2021-10-20 | 2022-03-15 | 福建雪氢加氢装备有限公司 | Special joint sealing structure for high-pressure hydrogen storage container |
-
2022
- 2022-08-10 CN CN202210959430.0A patent/CN115289386A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003095382A (en) * | 2001-09-25 | 2003-04-03 | Ishikawajima Harima Heavy Ind Co Ltd | Tank manhole structure |
| CN101382235A (en) * | 2007-09-04 | 2009-03-11 | 八千代工业株式会社 | Sealing structure for high-pressure container |
| CN206055187U (en) * | 2016-07-02 | 2017-03-29 | 宁波镇洋化工发展有限公司 | Chlorine Buffer Vessel |
| CN110285315A (en) * | 2019-05-28 | 2019-09-27 | 江阴市富仁高科股份有限公司 | A kind of high-pressure hydrogen storage of the both ends with sealing structure |
| CN210601018U (en) * | 2019-05-28 | 2020-05-22 | 江阴市富仁高科股份有限公司 | High-pressure hydrogen storage container with sealing structures at two ends |
| CN211282269U (en) * | 2019-12-13 | 2020-08-18 | 湖北华特专用设备有限公司 | One-key manhole cover with double safety devices for road transportation tank type vehicle |
| CN114183690A (en) * | 2021-10-20 | 2022-03-15 | 福建雪氢加氢装备有限公司 | Special joint sealing structure for high-pressure hydrogen storage container |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115638369A (en) * | 2022-12-23 | 2023-01-24 | 江苏皓宇特种设备制造有限公司 | Boiler pressure vessel with anti-leakage structure |
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