CN211975886U - Zero-leakage combined shaft seal device for high-temperature and high-dust working condition - Google Patents
Zero-leakage combined shaft seal device for high-temperature and high-dust working condition Download PDFInfo
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- CN211975886U CN211975886U CN202020110953.4U CN202020110953U CN211975886U CN 211975886 U CN211975886 U CN 211975886U CN 202020110953 U CN202020110953 U CN 202020110953U CN 211975886 U CN211975886 U CN 211975886U
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Abstract
The utility model relates to the technical field of shaft seal, in particular to a zero-leakage combined shaft seal device for high-temperature and high-dust working conditions, wherein a fixed end combined seal device is sleeved on a drive end on the left side of a rotating shaft, a sliding end combined seal device is arranged on the other end on the right side of the rotating shaft and is symmetrically arranged relative to a pyrolysis reactor of the fixed end combined seal device; when the sliding end limiting mechanism rotates along with the rotating shaft, the sliding end double-end-face mechanical seal rotates synchronously with the sliding end limiting mechanism through the smooth guide rod. The utility model discloses can realize under 500 ℃ -1200 ℃ ambient temperature, the span of axles is 10 ~ 15 meters long, and the diameter is the reliable and stable operation of shaft seal when more than 400mm, guarantees the zero leakage of solid heat carrier particle dust and toxic gas in the pyrolytic reaction ware.
Description
Technical Field
The utility model belongs to the technical field of the shaft seal, concretely relates to zero leakage combination shaft seal device for high temperature high dust operating mode.
Background
The pyrolysis reactor is a key core device in a household garbage pyrolysis system, plays a role in conveying, mixing and stirring household garbage and a solid heat carrier, and the household garbage is decomposed into CO and H in the pyrolysis reactor under the action of the high-temperature heat carrier2S、H2Flammable and combustible toxic pyrolysis gas such as this, because entire system is in the high temperature anoxybiotic environment about 500 ~ 1200 ℃ and the solid heat carrier is tiny particle, pyrolysis reactor's long axis span is long, can arouse in the time of the operation to beat, there is certain gas leakage, pyrolysis gas overflows the reactor and can cause the pollution to the surrounding environment, and form explosive gas environment, and the air gets into inside then can arouse the burning of pyrolysis reactor, so pyrolysis reactor is zero leakage and the axle seal environmental condition is harsh to the axle seal device performance requirement. The common shaft seal used at home and abroad for high temperature is mainly a packing seal and a mechanical seal.
The packing sealing structure is simple, the requirement on the processing precision of a shaft is low, but the packing sealing performance is poor, a packing gland needs to be fastened frequently in the using process, the stability is poor, the packing gland cannot be sealed completely, flammable and explosive toxic pyrolysis gas is easy to leak out when the packing sealing structure is used in a pyrolysis reactor, the consumed power is overlarge, and the packing sealing structure is not suitable for being used as a sealing device of a rotary shaft of the pyrolysis reactor.
Although mechanical seal sealing performance is good, stability is high, but simple mechanical seal directly exposes direct seal high temperature solid heat carrier in pyrolysis reactor, can get into sealed inside by high temperature solid heat carrier very easily to cause sealed damage, and mechanical seal damages the back, and the pyrolysis reactor is gone into easily to the water that is used for cooling mechanical seal, can cause very big influence with pyrolysis technology. In addition, under high temperature environment, the expansion and radial runout of the long shaft can cause the extrusion and unbalance between the dynamic ring and the static ring of the traditional mechanical seal, thereby causing the damage of the mechanical seal, so the traditional mechanical seal can not be used as a sealing device of the pyrolysis reactor.
Therefore, a new sealing device is needed to meet the sealing requirement of the pyrolysis reactor shaft.
Disclosure of Invention
An object of the utility model is to provide a zero leakage combination shaft seal device for high temperature high dust operating mode, the leakproofness is good and stability is high under high temperature environment.
The technical scheme of the utility model as follows:
a zero-leakage combined shaft seal device for high-temperature and high-dust working conditions is used for sealing a gap Q between a double rotating shaft of a pyrolysis reactor and a housing of the pyrolysis reactor to prevent harmful gas from escaping; comprises a fixed end combined sealing device and a sliding end combined sealing device;
the fixed end combined sealing device is sleeved at the driving end on the left side of the rotating shaft and comprises a fixed end isolation air seal, a fixed end multi-stage labyrinth seal, a fixed end brush seal, a fixed end double-end-face mechanical seal and a fixed end limiting mechanism;
the sliding end combined sealing device is arranged at the other end on the right side of the rotating shaft and is symmetrically arranged relative to the fixed end combined sealing device relative to the pyrolysis reactor, and comprises a sliding end isolation air seal, a sliding end multi-stage labyrinth seal, a sliding end brush seal, a sliding end double-end-face mechanical seal and a sliding end limiting mechanism.
The structure that the airtight is kept apart to the slip end and the airtight is kept apart to the stiff end is the same, the multistage labyrinth seal of slip end is the same with the multistage labyrinth seal's of stiff end structure, the brush seal of slip end is the same with the brush seal's of stiff end structure, slip end bi-polar face mechanical seal is the same with stiff end bi-polar face mechanical seal's structure, stiff end stop gear is inequality with slip end stop gear structure.
The fixed end isolation air seal is a first seal for contacting the fixed end combined sealing device with the shell of the pyrolysis reactor; the fixed end isolation air seal is in a ring shape and is sleeved on the rotating shaft; an air supply channel is processed on the circular ring, an air inlet of the air supply channel is positioned on the side surface of the outer ring of the circular ring, and an air outlet of the air supply channel is positioned on the end surface of one side of the circular ring; the air inlet of the fixed end isolation air seal is communicated with the isolation air supply end, and the air outlet of the fixed end isolation air seal is opposite to the gap Q and is communicated with the isolation air supply end and the gap Q; the isolation gas is inert gas which does not react with the sealing medium, and the pressure of the isolation gas is higher than the internal pressure of the pyrolysis reactor and does not exceed 10 kpa.
The fixed end multi-stage labyrinth seal is processed on the side wall of the inner ring of the annular cavity of the fixed end isolation air seal and is contacted with the rotating shaft to form a second seal; the fixed end multi-stage labyrinth seal has 4-5 throttling tooth gaps; the distance between each throttling gear gap is 1mm, and the gap between each throttling gear gap and the shaft is 0.5 mm.
The fixed end brush type seal consists of an annular brush, is positioned on the left side of the fixed end isolation air seal and is connected with the fixed end isolation air seal through a bolt to form a third seal; the brush silk adopts nanometer level technique, scribbles high temperature resistant lubricating grease on the brush silk, and long-time operation can not produce the mar to the axis of rotation, can compensate the space that the axis of rotation is beated and is produced simultaneously, and wherein annular brush thickness is 5 mm.
The fixed end double-end-face mechanical seal is positioned on the left side of the fixed end brush seal and is connected with the fixed end brush seal through a bolt; the fixed end double-end-face mechanical seal comprises a cooling water cavity, a balance tank, and two groups of movable rings and static rings which are arranged on two sides of the cooling water cavity; one group on the right side of the cooling water cavity is set as a moving ring A and a static ring A, and the other group on the left side of the cooling water cavity is set as a moving ring B and a static ring B; the moving ring A and the static ring A are both designed by adopting double hard-face sealing of hard alloy materials; the moving ring B is made of hard alloy, and the static ring B is made of graphite material and is in a sealing design combining soft and hard surfaces. Meanwhile, the movable ring B is connected with a fixed end double-end-face mechanical sealing movable ring seat through a bolt; the balance tank is connected with the cooling water cavity through a hose, is placed outside the combined sealing device and serves as a water storage tank, and meanwhile, the water storage tank is provided with a liquid level alarm device.
The fixed end limiting mechanism is of an annular structure and is located on the left side of the fixed end double-end-face mechanical seal, the rotating shaft is sleeved with the fixed end limiting mechanism in a sleeved mode, the fixed end limiting mechanism is fastened along the radial direction through a fastening screw, and meanwhile the fixed end limiting mechanism and the left side of the fixed end double-end-face mechanical seal movable ring seat are fixed together through screws.
The sliding end limiting mechanism is of an annular structure, is positioned on the right side of the double-end-face mechanical seal of the sliding end and is fastened on the rotating shaft along the radial direction through a fastening screw; and a groove is axially processed on the outer ring of the sliding end limiting mechanism and used for limiting the smooth guide rod.
One end of the smooth guide rod is fixed with the right side of the sliding end double-end-face mechanical sealing movable ring seat through threads, and the middle part of the smooth guide rod is clamped in a groove in the sliding end limiting mechanism.
When the sliding end limiting mechanism rotates along with the rotating shaft, the sliding end double-end-face mechanical seal rotates synchronously with the sliding end limiting mechanism through the smooth guide rod.
The beneficial effects of the utility model reside in that:
(1) the utility model discloses keep apart that airtight and multistage labyrinth seal can ensure that a large amount of high-temperature gas dust can not get into hou mian sealing system, and brush sealed can adapt to the jumping amount of pivot to a certain extent, ensures that solid dust particle can not get into behind double mechanical seal in, double mechanical seal can ensure the gaseous zero of pyrolysis and leak.
(2) The utility model discloses contain balance tank and alarm device among the auxiliary system, ensure that the device damages the back cooling water among the double mechanical seal can not get into inside the equipment, influence the whole operation of equipment.
(3) The utility model discloses a modular sealing device divide into stiff end and two kinds of forms of slip end, through the structural design who does the difference on the stop gear, can make the thermal expansion volume of pivot remove to slip end direction, makes modular sealing device stable work under the condition of thermal expansion axle extension.
(4) The utility model discloses a combination formula sealing device contains the isolation gas and seals, and multistage labyrinth seals, brush seal, bi-polar face seal, stop gear and auxiliary system can realize under 500 ℃ -1200 ℃ ambient temperature, and the span of an axle is 10 ~ 15 meters long, and the diameter is the reliable and stable operation of axle seal when 400mm is above, guarantees the zero leakage of solid heat carrier particle dust and toxic gas in the pyrolytic reaction ware.
Drawings
FIG. 1 is a schematic structural view of the upper half of the combined sealing device of the present invention;
FIG. 2 is a schematic view of a fixed end limiting mechanism;
fig. 3 is a schematic view of a sliding end limiting mechanism.
In the figure: 1 fixing end combined sealing device; 2 sliding end combined sealing device; 11, the fixed end is isolated and hermetically sealed; 12 fixed end multi-stage labyrinth seal; 13 fixing end brush seal; 14, fixing end and double end surface mechanical sealing; 141 fixed end double end mechanical sealing movable ring seat; 15 fixing end limit mechanism; 21, isolating and air-sealing the sliding end; 22 sliding end multi-stage labyrinth seal; 23 sliding end brush seal; 24 sliding end double end face mechanical seal; 241 sliding end double end face mechanical seal movable ring seat; 25 sliding end limiting mechanism; a sliding end limiting mechanism before 251 shaft expansion; 252 sliding end limiting mechanisms after shaft expansion; 26 smooth guide rods.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The zero-leakage combined shaft sealing device for the high-temperature and high-dust working condition as shown in fig. 1 comprises a fixed end combined sealing device 1 and a sliding end combined sealing device 2. There are two axis of rotation that can carry, mix solid heat carrier and domestic waste in the pyrolytic reaction ware, the utility model discloses combination sealing device is used for sealed two axis of rotation and the clearance Q between the pyrolytic reaction ware shell, prevents that harmful gas from escaping.
The fixed end combined sealing device 1 is sleeved at a driving end on the left side of the rotating shaft and comprises a fixed end isolation air seal 11, a fixed end multi-stage labyrinth seal 12, a fixed end brush seal 13, a fixed end double-end-face mechanical seal 14 and a fixed end limiting mechanism 15.
The fixed end isolation air seal 11 is the first seal of the fixed end combined sealing device 1 contacting with the shell of the pyrolysis reactor. The fixed end isolation air seal 11 is in a ring shape and is sleeved on the rotating shaft. And an air supply channel is processed on the circular ring, an air inlet of the air supply channel is positioned on the side surface of the outer ring of the circular ring, and an air outlet of the air supply channel is positioned on the end surface of one side of the circular ring. The air inlet of the fixed end isolation air seal 11 is communicated with the isolation air supply end, and the air outlet of the fixed end isolation air seal is opposite to the gap Q and is communicated with the isolation air supply end and the gap Q. By introducing the separation gas into the gas supply channel of the fixed-end separation gas seal 11, positive pressure is formed in the gap Q, and a high-temperature solid heat carrier escaping from the inside of the pyrolysis reactor to the gap Q is blown out, and meanwhile, the high-temperature gas of the pyrolysis reactor is prevented from entering the inside of the fixed-end combined sealing device 1 to damage the combined sealing device, so that good sealing is formed. The isolation gas is any one of N2, CO2 and water vapor, and the pressure of the isolation gas is higher than the internal pressure of the pyrolysis reactor and is not more than 10 kpa.
The fixed end multi-stage labyrinth seal 12 is processed on the side wall of the inner ring of the annular cavity of the fixed end isolation air seal 11 and is in contact with the rotating shaft. The multistage labyrinth seal 12 of stiff end totally 4 ~ 5 throttle tooth gaps, every throttle tooth gap interval is 1mm, the clearance between every throttle tooth gap and the axle is 0.5 mm. Due to the turbulent mixing effect of the airflow, when the pyrolysis gas mixed with the solid heat carrier passes through the fixed end labyrinth seal 12, a part of kinetic potential energy can be converted into heat energy, and the kinetic potential energy is reduced, so that the purpose of sealing is achieved, and a second seal is formed.
The fixed end brush seal 13 is composed of an annular brush with the thickness of 5mm, is positioned on the left side of the fixed end isolation air seal 11 and is connected with the fixed end isolation air seal 11 through a bolt. The brush wire of the fixed end brush seal 13 adopts a nanometer technology, high-temperature-resistant lubricating grease is coated on the brush wire, scratches cannot be generated on the rotating shaft after long-time operation, meanwhile, the gap generated by jumping of the rotating shaft can be compensated, and a third seal is formed.
The fixed end double-end-face mechanical seal 14 is positioned on the left side of the fixed end brush seal 13 and is connected with the fixed end brush seal 13 through a bolt. The fixed end double-end-face mechanical seal 14 comprises a cooling water cavity, a balance tank, and two groups of movable rings and static rings which are arranged on two sides of the cooling water cavity. The cooling water cavity is sleeved on the rotating shaft, wherein a group on the right side of the cooling water cavity is provided with a movable ring A and a static ring A which are both designed by adopting hard alloy material double-hard-face sealing; a group of cooling water cavity left side is established to rotating ring B and quiet ring B, and rotating ring B adopts carbide, and quiet ring B adopts graphite material, and soft or hard combines seal structure form like this to guarantee that stiff end double mechanical seal 14 can the steady operation under the environment of high temperature solid heat carrier. The movable ring B is connected with a fixed end double-end-face mechanical seal movable ring seat 141 through a bolt.
Through to the cooling water chamber in let in recirculated cooling water in order to guarantee that the inside temperature of stiff end double mechanical seal 14 can not the superelevation, prevent that the inside O type circle of stiff end double mechanical seal 14 from being damaged by high temperature for also can stabilize the safe operation under high temperature environment. The balance tank is connected with the cooling water cavity through a hose, is placed outside the combined sealing device and serves as a water storage tank, and a liquid level alarm device is arranged on the water outlet tank. Once the cooling water leaks, the cooling water enters the balance tank, when the liquid level reaches the warning line system, the warning line system can give an alarm, the cooling water can be prevented from entering a gap Q formed between the shell of the pyrolysis reactor and the fixed combined sealing device 1 through the fixed end brush seal 13 and the fixed end multi-stage labyrinth seal 12 after the cooling water leaks, and then the cooling water is prevented from entering the pyrolysis reactor.
As shown in fig. 2, the fixed end limiting mechanism 15 is of an annular structure, and is located on the left side of the fixed end double-end-face mechanical seal 14, and is sleeved on the rotating shaft and fastened radially by fastening screws, and is fixed together with the left side of the fixed end double-end-face mechanical seal moving ring seat 141 by screws, so that not only can the rotating shaft and the fixed end combined sealing device 1 rotate synchronously, but also the left driving end of the rotating shaft can be ensured to be subjected to thermal expansion, and then the direction of the expansion amount can be conducted to the other end on the right side of the rotating shaft, so that the fixed end combined sealing device.
The sliding end combined sealing device 2 is arranged at the other end on the right side of the rotating shaft and is symmetrically arranged relative to the fixed end combined sealing device 1 relative to the pyrolysis reactor, and comprises a sliding end isolation air seal 21, a sliding end multistage labyrinth seal 22, a sliding end brush seal 23, a sliding end double-end-face mechanical seal 24 and a sliding end limiting mechanism 25.
The sliding end isolation air seal 21 and the fixed end isolation air seal 11 have the same structure, the sliding end multistage labyrinth seal 22 and the fixed end multistage labyrinth seal 12 have the same structure, the sliding end brush seal 23 and the fixed end brush seal 13 have the same structure, and the sliding end double-end-face mechanical seal 24 and the fixed end double-end-face mechanical seal 14 have the same structure.
The sliding end limiting mechanism 25 is of an annular structure, is positioned on the right side of the sliding end double-end-face mechanical seal 24, and is fastened on the rotating shaft along the radial direction through fastening screws. And a groove is axially processed on the outer ring of the sliding end limiting mechanism 25 and used for limiting the smooth guide rod 26.
One end of the smooth guide rod 26 is fixed with the right side of the sliding end double-end-face mechanical sealing movable ring seat 241 through threads, and the middle part of the smooth guide rod 26 is clamped in a groove in the sliding end limiting mechanism 25. The sliding end double mechanical seal 24 rotates synchronously with the sliding end stop mechanism 25 via the smooth guide rod 26 as the sliding end stop mechanism 25 rotates with the rotating shaft. As shown in fig. 3, after the rotating shaft expands due to heat, the sliding-end double-end-face mechanical seal 24 and the sliding-end limiting mechanism 25 slide axially relative to each other through the smooth guide rod 26 to counteract the effect of the rotating shaft after being subjected to high temperature.
Claims (10)
1. A zero-leakage combined shaft seal device for high-temperature and high-dust working conditions is characterized in that: the device is used for sealing a gap Q between a double rotating shaft of the pyrolysis reactor and a shell of the pyrolysis reactor to prevent harmful gas from escaping; comprises a fixed end combined sealing device (1) and a sliding end combined sealing device (2);
the fixed end combined sealing device (1) is sleeved at the driving end on the left side of the rotating shaft and comprises a fixed end isolating air seal (11), a fixed end multi-stage labyrinth seal (12), a fixed end brush seal (13), a fixed end double-end-face mechanical seal (14) and a fixed end limiting mechanism (15);
the sliding end combined sealing device (2) is arranged at the other end of the right side of the rotating shaft and is symmetrically arranged relative to the fixed end combined sealing device (1) relative to the pyrolysis reactor, and comprises a sliding end isolation air seal (21), a sliding end multi-stage labyrinth seal (22), a sliding end brush seal (23), a sliding end double-end-face mechanical seal (24) and a sliding end limiting mechanism (25).
2. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the structure that the airtight (11) was kept apart to slip end isolation gas seal (21) and stiff end is the same, the multistage labyrinth seal of slip end (22) and the multistage labyrinth seal of stiff end (12) are the same, the structure of slip end brush seal (23) and stiff end brush seal (13) is the same, slip end double-end face mechanical seal (24) and stiff end double-end face mechanical seal (14) are the same, stiff end stop gear (15) and slip end stop gear (25) structure are inequality.
3. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the fixed end isolation air seal (11) is a first seal for contacting the fixed end combined sealing device (1) with the shell of the pyrolysis reactor; the fixed end isolation air seal (11) is in a ring shape and is sleeved on the rotating shaft; an air supply channel is processed on the circular ring, an air inlet of the air supply channel is positioned on the side surface of the outer ring of the circular ring, and an air outlet of the air supply channel is positioned on the end surface of one side of the circular ring; the air inlet of the fixed end isolation air seal (11) is communicated with the isolation air supply end, and the air outlet of the fixed end isolation air seal is opposite to the gap Q and is communicated with the isolation air supply end and the gap Q; the isolation gas is inert gas which does not react with the sealing medium, and the pressure of the isolation gas is higher than the internal pressure of the pyrolysis reactor and does not exceed 10 kpa.
4. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the fixed end multi-stage labyrinth seal (12) is processed on the side wall of the inner ring of the annular cavity of the fixed end isolation air seal (11) and is contacted with the rotating shaft to form a second seal; the fixed end multi-stage labyrinth seal (12) has 4-5 throttling tooth gaps; the distance between each throttling gear gap is 1mm, and the gap between each throttling gear gap and the shaft is 0.5 mm.
5. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the fixed end brush type seal (13) consists of an annular brush, is positioned on the left side of the fixed end isolation air seal (11), and is connected with the fixed end isolation air seal (11) through a bolt to form a third seal; the brush silk adopts nanometer level technique, scribbles high temperature resistant lubricating grease on the brush silk, and long-time operation can not produce the mar to the axis of rotation, can compensate the space that the axis of rotation is beated and is produced simultaneously, and wherein annular brush thickness is 5 mm.
6. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the fixed end double-end-face mechanical seal (14) is positioned on the left side of the fixed end brush seal (13) and is connected with the fixed end brush seal (13) through a bolt; the fixed end double-end-face mechanical seal (14) comprises a cooling water cavity, a balance tank, and two groups of moving rings and static rings which are arranged on two sides of the cooling water cavity; one group on the right side of the cooling water cavity is set as a moving ring A and a static ring A, and the other group on the left side of the cooling water cavity is set as a moving ring B and a static ring B; the moving ring A and the static ring A are both designed by adopting double hard-face sealing of hard alloy materials; the moving ring B is made of hard alloy, and the static ring B is made of graphite material and is in a sealing design with soft and hard surfaces combined; meanwhile, the movable ring B is connected with a fixed end double-end-face mechanical seal movable ring seat (141) through a bolt; the balance tank is connected with the cooling water cavity through a hose, is placed outside the combined sealing device and serves as a water storage tank, and meanwhile, the water storage tank is provided with a liquid level alarm device.
7. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: stiff end stop gear (15) be annular structure, be located the left side of stiff end double mechanical seal (14), the cover is located the axis of rotation and is radially fastened through fastening screw, simultaneously with the left side of stiff end double mechanical seal rotating ring seat (141) through the fix with screw together.
8. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in claim 1, wherein: the sliding end limiting mechanism (25) is of an annular structure, is positioned on the right side of the sliding end double-end-face mechanical seal (24), and is fastened on the rotating shaft along the radial direction through fastening screws; and a groove is axially processed on the outer ring of the sliding end limiting mechanism (25) and is used for limiting the smooth guide rod (26).
9. The zero-leakage combined shaft seal device for high-temperature and high-dust conditions as claimed in claim 8, wherein: one end of the smooth guide rod (26) is fixed with the right side of the sliding end double-end-face mechanical seal movable ring seat (241) through threads, and the middle part of the smooth guide rod (26) is clamped in a groove in the sliding end limiting mechanism (25).
10. The zero-leakage combined shaft seal device for the high-temperature and high-dust working condition as claimed in any one of claims 1 to 9, wherein: when the sliding end limiting mechanism (25) rotates along with the rotating shaft, the sliding end double-end-face mechanical seal (24) rotates synchronously with the sliding end limiting mechanism (25) through the smooth guide rod (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020110953.4U CN211975886U (en) | 2020-01-17 | 2020-01-17 | Zero-leakage combined shaft seal device for high-temperature and high-dust working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020110953.4U CN211975886U (en) | 2020-01-17 | 2020-01-17 | Zero-leakage combined shaft seal device for high-temperature and high-dust working condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211975886U true CN211975886U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020110953.4U Active CN211975886U (en) | 2020-01-17 | 2020-01-17 | Zero-leakage combined shaft seal device for high-temperature and high-dust working condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211975886U (en) |
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2020
- 2020-01-17 CN CN202020110953.4U patent/CN211975886U/en active Active
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