CN217633865U - Sealing and airtight device for lower airtight rotating shaft of blast furnace - Google Patents
Sealing and airtight device for lower airtight rotating shaft of blast furnace Download PDFInfo
- Publication number
- CN217633865U CN217633865U CN202221932827.2U CN202221932827U CN217633865U CN 217633865 U CN217633865 U CN 217633865U CN 202221932827 U CN202221932827 U CN 202221932827U CN 217633865 U CN217633865 U CN 217633865U
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- sealing
- nitrogen
- airtight
- sealed
- valve
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- 238000007789 sealing Methods 0.000 title claims abstract description 87
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 141
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 48
- 239000004519 grease Substances 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 37
- 210000004907 gland Anatomy 0.000 claims description 17
- 239000010687 lubricating oil Substances 0.000 claims description 10
- 239000003034 coal gas Substances 0.000 claims description 9
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 abstract description 15
- 238000005461 lubrication Methods 0.000 abstract description 11
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 15
- 230000001105 regulatory effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model provides a sealed airtight device of close pivot under blast furnace, include: the bottom surface of the lower sealing valve shell is provided with a lower sealing valve rotating shaft, and a Y-shaped rubber sealing body is tightly attached between the lower sealing valve shell and the lower sealing valve rotating shaft; the blocking assembly is arranged on one side of the lower airtight valve shell and used for blocking the baking path of furnace top high-temperature gas to lubricating grease and the baking path of the Y-shaped rubber sealing body, the blocking assembly comprises an airtight cover body, the airtight cover body is welded on one side of the lower airtight valve shell, nitrogen enters the airtight cover body through a pipeline and absorbs heat inside the airtight cover body, then is discharged through a gap between an airtight cover end cover and a lower airtight valve rotating shaft and takes away the heat inside, the temperature inside the airtight cover body cannot rise due to the baking of the high-temperature gas, and the occurrence of gas leakage accidents caused by the fact that lubricating grease and a sealing ring lose lubrication and sealing performance due to high temperature is avoided.
Description
Technical Field
The utility model relates to a blast furnace equipment field especially relates to sealed airtight device of close pivot under the blast furnace.
Background
The blast furnace uses steel plate as furnace shell, and refractory brick lining is built in the shell. The blast furnace body is divided into a furnace throat, a furnace body, a furnace waist, a furnace belly and a furnace hearth 5 from top to bottom. Because of the advantages of good economic index, simple process, large production capacity, high labor production efficiency, low energy consumption and the like of the blast furnace ironmaking technology, the iron produced by the method accounts for the vast majority of the total iron production in the world.
Because the temperature fluctuation of the blast furnace top raw gas is large, the instant temperature can reach more than 350 ℃, the lubricating grease is dried, solidified and loses the lubricating effect, the abrasion speed of the sealing ring and the rotating shaft is accelerated, the sealing ring of the rotating shaft of the lower sealing valve is made of rubber, the sealing ring loses the sealing performance when being baked by high-temperature gas, so that the gas leakage accident is caused, and the blast furnace is forced to stop blowing for rush repair.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an overcome above-mentioned problem or solve the sealed airtight device of close pivot under the blast furnace of above-mentioned problem partially at least to solve because blast furnace roof crude gas temperature fluctuation is great, the temperature can reach more than 350 ℃ in the twinkling of an eye, cause lubricating grease to solidify and lose the lubrication action and accelerate sealing washer and pivot wearing and tearing speed, lower airtight valve pivot sealing washer is the rubber material, the sealing washer receives high temperature coal gas and toasts the sealing washer and lose sealing performance and lead to the gas leakage occurence of failure, the problem that the blast furnace was salvageed by forced damping down.
In order to achieve the above object, the technical solution of the present invention is specifically realized as follows:
the utility model provides a sealed airtight device of close pivot under blast furnace, include:
the bottom surface of the lower sealing valve shell is provided with a lower sealing valve rotating shaft, and a Y-shaped rubber sealing body is tightly attached between the lower sealing valve shell and the lower sealing valve rotating shaft;
the utility model discloses a sealed valve, including sealed valve casing, block subassembly, it sets up to block the subassembly one side of sealed valve casing down for block furnace roof high temperature coal gas to grease and the stoving of the sealed body of Y type rubber is through, block the subassembly and include the airtight cover body, the welding of airtight cover body is in one side of sealed valve casing down, the fixed cover in inside of sealed valve casing is equipped with first nitrogen gas pipeline down, the one end of first nitrogen gas pipeline is passed one side of sealed valve casing down and is extended to the opposite side of sealed valve casing down, the other end fixed mounting of first nitrogen gas pipeline has nitrogen flow control valve, the excircle wall of sealed valve casing down is provided with the thermocouple, the one end of thermocouple is passed one side of sealed valve casing down and is extended to the opposite side of sealed valve casing down, one side of airtight cover body is provided with airtight cover end cover, airtight cover end cover with be provided with the clearance down between the sealed valve pivot.
Through adopting above-mentioned technical scheme, through setting up the airtight cover body, make the airtight valve seal down within a sealed space through the airtight cover body, the stoving of furnace roof high temperature coal gas to lubricating grease and Y type rubber seal body has been blocked and has been passed through, the thermocouple monitors the ambient temperature in this space often, and with temperature transmission to PLC control system, control system is according to the aperture size of thermocouple feedback temperature's height automatic control nitrogen flow control valve, the higher the ambient temperature is the bigger nitrogen flow control valve aperture, nitrogen gas gets into airtight cover body inside absorption airtight cover body inside heat back rethread airtight cover end cover and the clearance discharge between the airtight valve pivot down and takes away inside heat, reach airtight cover body inside ambient temperature and can not receive the stoving of high temperature coal gas and rise, stop lubricating grease, the sealing washer leads to the emergence of leakage accident because of high temperature loss lubrication and sealing performance.
As a further scheme of the utility model, the other end of first nitrogen gas pipeline is provided with second nitrogen gas pipeline, the one end of second nitrogen gas pipeline through with nitrogen gas flow control valve connects the setting and is in the other end of first nitrogen gas pipeline, the other end of second nitrogen gas pipeline is connected with the nitrogen gas source.
Through adopting above-mentioned technical scheme, through setting up second nitrogen gas pipeline, can make nitrogen gas provenance get into the inside of airtight cover body through the second nitrogen gas pipeline.
As a further scheme of the utility model, the one end fixed mounting of first nitrogen gas pipeline has the nitrogen gas ring canal, the nitrogen gas ring canal with first nitrogen gas pipeline is linked together, airtight cover body with fixed mounting has the nitrogen gas spray tube between the nitrogen gas ring canal, the nitrogen gas spray tube respectively with airtight cover body with the nitrogen gas ring canal is linked together.
Through adopting above-mentioned technical scheme, through setting up nitrogen gas spray tube and nitrogen gas ring canal, can spout the inside of airtight cover body through nitrogen gas spray tube and nitrogen gas ring canal nitrogen gas in first nitrogen gas pipeline, take away the inside heat of airtight cover body by the clearance discharge between airtight cover end cover and the lower airtight valve pivot again.
As a further scheme of the utility model, the left and right sides of lower valve case all is provided with Y type rubber gland, one side threaded connection of Y type rubber gland has first fastening bolt, two Y type rubber gland is respectively through two first fastening bolt fixed mounting in the left and right sides of lower valve case.
Through adopting above-mentioned technical scheme, through setting up Y type rubber gland, it is fixed with lower sealed valve case under the effect of fastening bolt through Y type rubber gland to make Y type rubber seal closely laminate under between sealed valve case and Y type rubber gland.
As a further scheme of the utility model, the inside of lower dense valve case is provided with the oil distribution ring, sealed lubrication oil duct has been seted up to one side of lower dense valve case, sealed lubrication oil duct with the oil distribution ring is linked together.
Through adopting above-mentioned technical scheme, through setting up the lubricating oil duct, can lubricate Y type rubber seal body and lower airtight valve pivot to the interior injection lubricating grease of branch oil ring through the lubricating oil duct.
As a further aspect of the present invention, one side of the airtight cover end cap is connected with a second fastening bolt through a thread, and the airtight cover end cap is fixedly installed on one side of the airtight cover body through the second fastening bolt.
By adopting the technical scheme, through setting up second fastening bolt, can with through second fastening bolt airtight cover end cover fixed mounting in one side of airtight cover body demolishs airtight cover end cover inspection internal seal condition when conveniently overhauing.
The utility model provides a sealed airtight device of close pivot under blast furnace, beneficial effect lies in:
through setting up the airtight cover body, make the airtight valve seal down within a sealed space through the airtight cover body, the stoving of furnace roof high-temperature gas to lubricating grease and Y type rubber seal body is passed through, the thermocouple monitors the ambient temperature in this space often, and with temperature transmission to PLC control system, control system is according to the height automatic control nitrogen flow control valve's of thermocouple feedback temperature aperture size, the higher the ambient temperature is the nitrogen flow control valve aperture is bigger, nitrogen gas gets into the inside absorption airtight cover body of airtight cover body after the heat through the pipeline and discharges through the clearance between airtight cover end cover and the airtight valve pivot and takes away inside heat down, it can not receive the stoving of high-temperature gas and rise to reach airtight cover body inside ambient temperature, lubricating grease stops, the sealing washer loses lubrication and sealing performance because of high temperature leads to the coal gas leakage accident to take place.
Through setting up nitrogen gas spray tube and nitrogen gas ring canal, can spout into the inside of airtight cover body through nitrogen gas spray tube and nitrogen gas ring canal nitrogen gas in first nitrogen gas pipeline, take away the inside heat of airtight cover body again by the clearance discharge between airtight cover end cover and the lower sealed valve pivot again, through setting up Y type rubber gland, through Y type rubber gland fixed with sealed valve case down under the effect of fastening bolt, thereby make Y type rubber seal closely laminate under between sealed valve case and Y type rubber gland.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a front view provided by an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structural view provided by an embodiment of the present invention;
fig. 3 is a schematic view of a splitting structure provided by the embodiment of the present invention.
In the figure: 1. a lower seal valve housing; 2. an oil separating ring; 3. a Y-shaped rubber seal body; 4. a Y-shaped rubber sealing gland; 5. a first fastening bolt; 6. a lower sealing valve rotating shaft; 7. a lubricating oil passage; 8. a first nitrogen gas conduit; 9. a nitrogen flow regulating valve; 10. a nitrogen ring pipe; 11. a nitrogen gas nozzle; 12. an airtight cover body; 13. an airtight cover end cap; 14. a second fastening bolt; 15. a gap; 16. a thermocouple; 17. a second nitrogen gas line.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, 2 and 3, the blast furnace lower sealing shaft sealing airtight device provided by the embodiment of the present invention includes a lower sealing valve housing 1, the lower sealing valve housing 1 is of an existing structure and is not described herein, a lower sealing valve shaft 6 is provided on the bottom surface of the lower sealing valve housing 1, the lower sealing valve shaft 6 is of an existing structure and is not described herein, a blocking component is provided on one side of the lower sealing valve housing 1 tightly attached to the Y-shaped rubber sealing body 3 between the lower sealing valve housing 1 and the lower sealing valve shaft 6 for blocking the baking path of the furnace top high temperature gas to the grease and the Y-shaped rubber sealing body 3, the blocking component includes an airtight cover body 12, the airtight cover body 12 is of an existing structure and is not described herein, the airtight cover body 12 is welded on one side of the lower sealing valve housing 1, a first nitrogen pipeline 8 is provided inside the lower sealing valve housing 1, one end of a first nitrogen pipeline 8 penetrates through one side of a lower sealing valve shell 1 and extends to the other side of the lower sealing valve shell 1, the other end of the first nitrogen pipeline 8 is fixedly provided with a nitrogen flow regulating valve 9, the nitrogen flow regulating valve 9 is of a conventional structure and is not described in detail herein, the outer circle wall surface of the lower sealing valve shell 1 is provided with a thermocouple 16, the thermocouple 16 is of a conventional structure and is not described in detail herein, one end of the thermocouple 16 penetrates through one side of the lower sealing valve shell 1 and extends to the other side of the lower sealing valve shell 1, one side of an airtight cover body 12 is provided with an airtight cover end cover 13, the airtight cover end cover 13 is of a conventional structure and is not described in detail herein, a gap 15 is formed between the airtight cover end cover 13 and a lower sealing valve rotating shaft 6, the lower sealing valve is sealed in a sealed space through the airtight cover body 12, the baking of the lubricating grease and a Y-shaped rubber sealing body 3 by high-temperature coal gas is blocked, the thermocouple 16 monitors the environmental temperature of the space at any time, the temperature is transmitted to the PLC control system, the control system automatically controls the opening size of the nitrogen flow regulating valve 9 according to the temperature fed back by the thermocouple 16, the higher the environmental temperature is, the larger the opening size of the nitrogen flow regulating valve 9 is, nitrogen enters the airtight cover body 12 through a pipeline to absorb the internal heat of the airtight cover body 12 and then is discharged through a gap 15 between the airtight cover end cover 13 and the lower airtight valve rotating shaft 6 to take away the internal heat, the internal environmental temperature of the airtight cover body 12 cannot be baked by high-temperature coal gas to rise, and the occurrence of coal gas leakage accidents caused by the loss of lubrication and sealing performance of lubricating grease and sealing rings due to high temperature is avoided.
Referring to fig. 1, 2 and 3, a second nitrogen pipe 17 is disposed at the other end of the first nitrogen pipe 8, one end of the second nitrogen pipe 17 is connected to a nitrogen flow regulating valve 9 and disposed at the other end of the first nitrogen pipe 8, the other end of the second nitrogen pipe 17 is connected to a nitrogen source, a nitrogen loop 10 is fixedly mounted at one end of the first nitrogen pipe 8, the nitrogen loop 10 is of a conventional structure and is not described herein, the nitrogen loop 10 is communicated with the first nitrogen pipe 8, a nitrogen nozzle 11 is fixedly mounted between the airtight cover body 12 and the nitrogen loop 10, the nitrogen nozzle 11 is of a conventional structure and is not described herein, the nitrogen nozzle 11 is respectively communicated with the airtight cover body 12 and the nitrogen loop 10, Y-shaped rubber sealing glands 4 are disposed on both left and right sides of the lower airtight valve housing 1, the Y-shaped rubber sealing glands 4 are of a conventional structure and are not described herein, a first fastening bolt 5 is threadedly connected to one side of the Y-shaped rubber sealing gland 4, first fastening bolt 5 does not do here for existing structure and gives redundant details, two Y type rubber seal gland 4 respectively through two first fastening bolt 5 fixed mounting the left and right sides of sealed valve case 1 down, the inside of sealed valve case 1 is provided with oil distribution ring 2 down, oil distribution ring 2 does not do here for existing structure and gives redundant details, sealed lubrication oil duct 7 has been seted up to one side of sealed valve case 1 down, sealed lubrication oil duct 7 does not do here for existing structure and gives redundant details, sealed lubrication oil duct 7 is linked together with oil distribution ring 2, one side threaded connection of airtight cover end cover 13 has second fastening bolt 14, second fastening bolt 14 does not do here for existing structure, airtight cover end cover 13 passes through one side of second fastening bolt 14 fixed mounting at airtight cover body 12, through setting up lubrication oil duct 7, can lubricate Y type rubber seal body 3 and give redundant details through lubricating oil duct 7 to pouring into lubricating grease into in oil distribution ring 2 in lubricating grease into lubricating grease through lubricating oil duct 7 The lower hermetic valve rotating shaft 6 is provided with a second fastening bolt 14, and the hermetic cover end cover 13 can be fixedly installed on one side of the hermetic cover body 12 through the second fastening bolt 14.
The working principle is as follows: referring to fig. 1-3, when in use, the airtight cover body 12 is arranged, the airtight cover body 12 is fixed on the inner side of the lower airtight valve casing 1 through welding, the airtight cover end cover 13 is fixed on the airtight cover body 12 through the airtight cover end cover 13 and the second fastening bolt 14, the airtight cover end cover 13 is removed to check the internal sealing condition when maintenance is convenient, one end of the first nitrogen pipeline 8 is connected with a nitrogen gas source, the other end of the first nitrogen pipeline is connected with the nitrogen flow regulating valve 9, the nitrogen flow regulating valve 9 penetrates through the lower airtight valve casing 1 through the first nitrogen pipeline 8 to be connected with the nitrogen ring pipe 10, the first nitrogen pipeline 8 is fixed with the lower airtight valve casing 1 in a welding manner, the nitrogen gas spray pipe 11 is arranged between the nitrogen ring 10 and the airtight cover, the thermocouple 16 is arranged in the airtight cover sealing area, the thermocouple 16 is arranged on the base in a welding manner for sealing and fixing, a gap 15 is left between the airtight cover end cover 13 and the lower airtight valve rotating shaft 6, and after installation, lubricating oil is injected into the lubricating oil channel 7, so that the oil distribution ring 2 is filled with lubricating oil.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (6)
1. Airtight device is sealed to sealed pivot under blast furnace which characterized in that includes:
the sealing device comprises a lower sealing valve shell (1), wherein a lower sealing valve rotating shaft (6) is arranged on the bottom surface of the lower sealing valve shell (1), and a Y-shaped rubber sealing body (3) is tightly attached between the lower sealing valve shell (1) and the lower sealing valve rotating shaft (6);
the utility model provides a low-pressure gas seal valve, including the sealed valve casing (1) of lower limit, block the subassembly setting and be in one side of sealed valve casing (1) down for block furnace roof high temperature coal gas to grease and the stoving of Y type rubber seal body (3) is through, it includes sealed cover body (12) to block the subassembly, sealed cover body (12) welding is in one side of sealed valve casing (1) down, the fixed cover of inside of sealed valve casing (1) is equipped with first nitrogen gas pipeline (8) down, the one end of first nitrogen gas pipeline (8) is passed one side of sealed valve casing (1) down and is extended to the opposite side of sealed valve casing (1) down, the other end fixed mounting of first nitrogen gas pipeline (8) has nitrogen gas flow control valve (9), the excircle wall of sealed valve casing (1) down is provided with thermocouple (16), the one end of thermocouple (16) is passed one side of sealed valve casing (1) down and is extended to the opposite side of sealed valve casing (1) down, one side of sealed cover body (12) is provided with sealed cover end cover (13) down, airtight cover end cover (13) with be provided with clearance (15) between sealed valve pivot (6) down.
2. The sealing and airtight device for the lower sealing shaft of the blast furnace according to claim 1, wherein a second nitrogen pipe (17) is provided at the other end of the first nitrogen pipe (8), one end of the second nitrogen pipe (17) is provided at the other end of the first nitrogen pipe (8) by being connected to the nitrogen flow rate adjusting valve (9), and the other end of the second nitrogen pipe (17) is connected to a nitrogen gas source.
3. The sealing and airtight device for the lower sealing shaft of a blast furnace according to claim 1, wherein a nitrogen ring pipe (10) is fixedly installed at one end of the first nitrogen pipeline (8), the nitrogen ring pipe (10) is communicated with the first nitrogen pipeline (8), a nitrogen nozzle (11) is fixedly installed between the airtight cover body (12) and the nitrogen ring pipe (10), and the nitrogen nozzle (11) is respectively communicated with the airtight cover body (12) and the nitrogen ring pipe (10).
4. The blast furnace lower sealing shaft sealing air-tight device according to claim 1, wherein Y-shaped rubber sealing glands (4) are arranged on the left and right sides of the lower sealing valve housing (1), a first fastening bolt (5) is connected to one side of each Y-shaped rubber sealing gland (4) in a threaded manner, and the two Y-shaped rubber sealing glands (4) are fixedly mounted on the left and right sides of the lower sealing valve housing (1) through the two first fastening bolts (5) respectively.
5. The blast furnace lower sealing rotating shaft sealing air-tight device according to claim 1, wherein an oil-separating ring (2) is arranged inside the lower sealing valve housing (1), a sealing lubricating oil channel (7) is formed in one side of the lower sealing valve housing (1), and the sealing lubricating oil channel (7) is communicated with the oil-separating ring (2).
6. The blast furnace lower sealing rotating shaft sealing air-tight device according to claim 1, wherein a second fastening bolt (14) is screwed to one side of the air-tight cover end cover (13), and the air-tight cover end cover (13) is fixedly installed at one side of the air-tight cover body (12) through the second fastening bolt (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221932827.2U CN217633865U (en) | 2022-07-26 | 2022-07-26 | Sealing and airtight device for lower airtight rotating shaft of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221932827.2U CN217633865U (en) | 2022-07-26 | 2022-07-26 | Sealing and airtight device for lower airtight rotating shaft of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217633865U true CN217633865U (en) | 2022-10-21 |
Family
ID=83636536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221932827.2U Expired - Fee Related CN217633865U (en) | 2022-07-26 | 2022-07-26 | Sealing and airtight device for lower airtight rotating shaft of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217633865U (en) |
-
2022
- 2022-07-26 CN CN202221932827.2U patent/CN217633865U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20221021 |
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| CF01 | Termination of patent right due to non-payment of annual fee |