CN216599176U - Radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor - Google Patents
Radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor Download PDFInfo
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- CN216599176U CN216599176U CN202220016098.XU CN202220016098U CN216599176U CN 216599176 U CN216599176 U CN 216599176U CN 202220016098 U CN202220016098 U CN 202220016098U CN 216599176 U CN216599176 U CN 216599176U
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- rotor
- magnetic yoke
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- pole body
- generator motor
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- 238000001816 cooling Methods 0.000 title claims abstract description 27
- 238000009423 ventilation Methods 0.000 claims abstract description 76
- 238000004804 winding Methods 0.000 claims abstract description 48
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000112 cooling gas Substances 0.000 description 31
- 238000010248 power generation Methods 0.000 description 17
- 239000007789 gas Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 210000004508 polar body Anatomy 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The invention discloses an inner-cooling type pumped storage generator motor rotor with multiple radial parallel wind paths, and relates to the field of motors. The invention aims to solve the problem that the rotor area of the existing pumped storage generator motor generates heat seriously. The number of segments of the rotor magnetic yoke and the rotor pole body along the axial direction is n segments, n-1 segments of magnetic yoke radial ventilation channels are formed between each segment of the rotor magnetic yoke, n-1 segments of rotor pole body radial ventilation channels are formed between each segment of the rotor pole body, ventilation channel steel is installed in the magnetic yoke radial ventilation channels and the rotor pole body radial ventilation channels, magnetic yoke gradually-widening type ventilation channels are arranged on each segment of the rotor magnetic yoke along the circumferential direction and the axial direction, rectangular ventilation holes are formed in the rotor winding along the axial direction, the positions of the rectangular ventilation holes correspond to the positions of the n-1 segments of rotor pole body radial ventilation channels in the axial direction, rotor insulation plates are installed between the rotor winding and the rotor pole body and between the rotor pressing plates, and V-shaped fans are installed at the end parts of the two sides of the rotor magnetic yoke. The invention enhances the cooling effect of the rotor area, effectively reduces the temperature of the rotor and is convenient to realize.
Description
Technical Field
The utility model relates to a radial many parallel wind path inner cooling formula pumped storage generator motor rotor belongs to the motor field.
Background
Hydroelectric power generation is one of the cleanest power generation modes, a pumped storage power generation motor has a crucial role as the most core equipment in the whole system of hydroelectric power generation, along with the rapid development of the hydroelectric power generation technology, the single machine capacity of a large pumped storage power generation motor is continuously increased, the efficiency and the material utilization rate of the power generation motor are continuously improved, but the problems of electromagnetic load and temperature rise of the power generation motor are increasingly aggravated while the single machine capacity of the pumped storage power generation motor is increased, so that the electromagnetic loss of the power generation motor is obviously increased, the temperature is obviously increased, the safe operation and the service life of the large pumped storage power generation motor are seriously influenced, and the hidden danger of reliable power supply and burying of the living demands of people is avoided.
In order to improve the reliability of a large pumped storage generator motor and reduce the temperature of an inner rotor winding, a rotor insulating plate, a rotor pole shoe, a damping strip and a rotor pole body of the pumped storage generator motor, the inner-cooling pumped storage generator motor rotor with multiple radial parallel air paths can be adopted, the total fluid flow in the generator motor is effectively increased, the contact area of cooling gas in the generator motor and the rotor winding, the rotor insulating plate, the rotor pole shoe, the damping strip and the rotor pole body is obviously increased, the utilization rate of the cooling gas is improved, and the temperature of each component in the rotor area of the pumped storage generator motor is effectively reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a radial many parallel wind paths internal cooling formula pumped storage generator motor rotor to solve the too high problem of traditional pumped storage generator motor rotor winding and rotor insulation board temperature, improved the gaseous flow and the utilization ratio in generator motor, accelerated the gaseous flow velocity in pumped storage generator motor, reduced the temperature of each component of generator motor inner rotor effectively, strengthened the ability of pumped storage generator motor safety and stability operation.
The utility model discloses a radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor, which comprises a rotor magnetic yoke, a magnetic yoke gradually-widening type ventilating duct, a V-shaped fan, a rotor pole shoe, a rotor pole body, ventilating channel steel, a rotor winding, a rotor insulation board, a magnetic yoke radial ventilating duct, a rotor pole body radial ventilating duct, a rotor pressing plate, a supporting plate, a damping strip, a rotor slot wedge, a rectangular ventilating hole and a magnetic yoke axial ventilating hole, wherein the number of the rotor magnetic yoke and the rotor pole body is n sections along the axial direction, n-1 sections of magnetic yoke radial ventilating ducts are formed between the rotor magnetic yokes of all sections, n-1 sections of rotor pole body radial ventilating ducts are formed between the rotor pole bodies of all sections, the ventilating channel steel is arranged in the magnetic yoke radial ventilating duct and the rotor pole body radial ventilating duct, each section of rotor magnetic yoke is provided with the magnetic yoke gradually-widening type ventilating duct along the circumferential direction and the axial direction, the rotor winding is provided with the rectangular ventilating hole along the axial direction, the rectangular ventilation holes correspond to the radial ventilation channels of the n-1 sections of rotor pole bodies in the axial direction, rotor insulation plates are arranged between the rotor windings and the rotor pole bodies and between the rotor windings and the rotor pressing plates, and the V-shaped fans are arranged at the end parts of the two sides of the rotor magnet yoke.
The number n of the rotor magnetic yoke sections ranges from 3 sections to 7 sections; the length of the inlet of the rectangular vent hole is 10mm to 20 mm; the width of the inlet of the rectangular vent hole is 5mm to 10 mm; the width of the radial ventilation channel of the rotor pole body is 6mm to 20 mm; the outlet length of the outer diameter of the gradually-widened magnetic yoke type ventilation duct is 280mm to 320 mm; the length of an inlet at the inner diameter of the gradually-widened magnetic yoke ventilating duct is 200mm to 240 mm; the width of the gradually-widened magnetic yoke type ventilating duct 2 is 5mm to 15 mm; the included angle a between the two blades of the V-shaped fan 3 is 30-50 degrees.
Preferably, the two blades of the V-shaped fan are not connected, so that the flow rate of cooling gas in the end area of the pumped storage generator motor is further increased, and the temperature of the end part of the rotor winding is further reduced.
Preferably, the distance between the adjacent rotor windings in the circumferential direction is increased, so that the gas flow between the rotor windings is increased, and the temperature of the rotor windings is further reduced.
Preferably, the end part of the rotor yoke is provided with a yoke axial vent hole, so that the contact area between the cooling gas and the end part of the rotor yoke is increased, and the temperature of the end part of the rotor yoke is further reduced.
The utility model has the advantages that: the temperature of a rotor winding and a rotor insulating plate of the large-capacity pumped storage generator motor is high, the utilization rate of cooling gas in a rotor area is low, and the limited space in the rotor area cannot be effectively utilized to generate larger gas flow. The utility model discloses a have seted up the gradually wide formula ventiduct of yoke along circumference and axial in will original pumped storage generator motor solid rotor yoke, n-1 section rotor polar body radial ventilation ditch has been seted up in rotor pole shoe and the rotor polar body, n-1 section rotor polar body radial ventilation ditch is linked together with n-1 section rotor yoke radial ventilation ditch, all install the ventilation channel-section steel in n-1 section yoke radial ventilation ditch and the n-1 section rotor polar body radial ventilation ditch, original solid rotor winding has seted up the rectangle ventilation hole along the axial, rotor yoke both sides tip has newly increased V type fan, constitute a radial many wind paths of parallel inner cooling type pumped storage generator motor rotor. The V-shaped fan drives the cooling gas in the end area of the pumped storage generator motor to flow, the heat of each component of the rotor winding end, the stator core end, the stator winding end and the stator end can be effectively taken away, the cooling gas in the radial ventilation channel of the rotor pole body and the rectangular ventilation holes in the rotor winding can effectively take away the heat of the rotor pole shoe, the rotor pole body, the damping strips and the rotor winding, and the temperature of the rotor pole shoe, the rotor pole body, the damping strips and the rotor winding is obviously reduced. The ventilation channel steel in the rotor area can further improve the flow of cooling gas in the pumped storage power generation motor and accelerate the flow speed of the cooling gas. The utility model discloses a radial many parallel wind paths internal cooling type pumped storage generator motor rotor can strengthen the regional cooling effect of rotor effectively, improved the utilization ratio of fluid flow and cooling gas in the pumped storage generator motor, obviously reduced the temperature of each component in the rotor region, reduced generator motor along axial direction's the difference in temperature and thermal stress effectively, strengthened the long-term safe and reliable ability of operation of pumped storage generator motor.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
Fig. 1 is a three-dimensional perspective view of the rotor of the internal cooling pumped storage generator motor with multiple radial parallel wind paths according to the present invention;
fig. 2 is a partial enlarged view of a magnetic pole part (position) of the rotor of the internal cooling pumped storage generator motor with multiple radial parallel wind paths according to the present invention;
fig. 3 is a partial enlarged view of a magnetic yoke portion (position:) of the rotor of the internal cooling pumped storage generator motor with multiple radial parallel wind paths according to the present invention;
fig. 4 is a top view of the rotor of the radial multiple parallel wind path internal cooling pumped storage generator motor according to the present invention;
fig. 5 is a side view of the rotor of the radial multiple parallel wind path internal cooling pumped storage generator motor according to the present invention;
fig. 6 is a cross-sectional view of the rotor M-M of the internal cooling pumped storage generator motor with multiple radial parallel wind paths according to the present invention;
fig. 7 is a top view of a rotor yoke of an internal cooling pumped storage generator motor with multiple radial parallel wind paths according to a second embodiment of the present invention;
fig. 8 is a top view of a rotor of an internal cooling pumped-storage generator motor with multiple radial parallel wind paths according to a third embodiment of the present invention;
fig. 9 is a partial enlarged view of the rotor yoke and the V-shaped fan of the radial multiple parallel wind path internal cooling pumped storage generator motor according to the fourth embodiment of the present invention;
in the figure: the air-cooling type rotor comprises a rotor magnetic yoke 1, a magnetic yoke 2, a gradually-widening type ventilation channel, a 3-V-shaped fan, a rotor pole shoe 4, a rotor pole body 5, a ventilation channel 6, a ventilation channel 7, a rotor winding 8, a rotor insulation plate 9, a magnetic yoke radial ventilation channel 10, a rotor pole body radial ventilation groove 10, a rotor pressing plate 11, a supporting plate 12, a damping strip 13, a rotor slot wedge 14, a rectangular ventilation hole 15 and a magnetic yoke axial ventilation hole 16. The arrows in the figure show the flowing direction of the cooling gas inside the rotor of the cold-type pumped storage generator motor in a radial multi-parallel air path.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows: fig. 1, 2, 3, 4, 5 and 6 illustrate the present embodiment, which includes a rotor yoke 1, a yoke gradually-widening type ventilation duct 2, a V-shaped fan 3, a rotor pole shoe 4, a rotor pole body 5, a ventilation channel 6, a rotor winding 7, a rotor insulation plate 8, a yoke radial ventilation duct 9, a rotor pole body radial ventilation groove 10, a rotor pressing plate 11, a supporting plate 12, a damping strip 13, a rotor slot wedge 14, a rectangular ventilation hole 15 and a yoke axial ventilation hole 16. Rotor yoke 1 and rotor pole body 5 are n sections along the axial number of sections, form n-1 section radial ventilation way of yoke 9 between each section rotor yoke 1, form n-1 section radial ventilation ditch 10 of rotor pole body between each section rotor pole body 5, ventilation channel-section steel 6 is installed in radial ventilation way of yoke 9 and rotor pole body radial ventilation ditch 10, the gradually wide formula ventilation way 2 of yoke has been seted up along circumference and axial to each section rotor yoke 1, rotor winding 7 has seted up rectangle ventilation hole 15 along the axial, rectangle ventilation hole 15 is corresponding with n-1 section radial ventilation ditch 10 position of rotor pole body in the axial direction, rotor winding 7 and rotor pole body 5, install rotor insulation board 8 between rotor pressing plate 11, V type fan 3 is installed at 1 both sides tip of rotor yoke.
The number n of the rotor magnetic yoke 1 is 3 to 7, and the number n of the rotor magnetic yoke is 5 in the embodiment; the length of the inlet of the rectangular vent hole 15 is 10mm to 20mm, and the length of the inlet of the rectangular vent hole is 15mm in the embodiment; the width of the inlet of the rectangular vent hole 15 is 5mm to 10mm, and the width of the inlet of the rectangular vent hole is 6mm in the embodiment; the width of the rotor pole body radial ventilation channel 10 is 6mm to 20mm, and 10mm is taken in the embodiment; the length of an outlet at the outer diameter of the gradually-widened magnetic yoke type air duct 2 is 280mm to 320mm, and 300mm is adopted in the embodiment; the length of the inlet at the inner diameter part of the magnetic yoke gradually-widening type ventilating duct 2 is 200mm to 240mm, and the length is 220mm in the embodiment; the width of the gradually-widened magnetic yoke type ventilating duct 2 is 5mm to 15mm, and the width is 7mm in the embodiment; the included angle a between the two blades of the V-shaped fan 3 is 30 ° to 50 °, and 40 ° is assumed in this embodiment.
A magnetic yoke gradually-widening type ventilating duct 2 is formed in a magnetic yoke 1 of an original pumped storage power generation motor along the circumferential direction and the axial direction, n-1 sections of rotor pole body radial ventilating channels 10 are formed in a rotor pole shoe 4 and a rotor pole body 5, the n-1 sections of rotor pole body radial ventilating channels 10 are communicated with n-1 sections of rotor magnetic yoke radial ventilating channels 9, ventilating channel steel 6 are installed in the n-1 sections of magnetic yoke radial ventilating channels 9 and the n-1 sections of rotor pole body radial ventilating channels 10, a rectangular ventilating hole 15 is formed in an original solid rotor winding along the axial direction, the position of the rectangular ventilating hole 15 corresponds to the position of the n-1 sections of rotor pole body radial ventilating channels in the axial direction, V-shaped fans 3 are additionally arranged at the end portions of two sides of the rotor magnetic yoke 1, and the radial multi-parallel wind path inner cooling type pumped storage power generation motor rotor is formed. No matter the pumped storage power generation motor is under the working condition of a generator (clockwise rotation) or under the working condition of a motor (anticlockwise rotation), one path of cooling gas can effectively increase the flow of the cooling gas in the end area of the pumped storage power generation motor under the driving of the V-shaped fan 3, the flow rate of the cooling gas in the end area is accelerated, the heat at the end part of the rotor winding 7 is effectively taken away by the cooling gas, the temperature of the end part of the rotor winding 7 is obviously reduced and then the cooling gas enters the end area of the stator, and the temperatures of the end part of the stator winding, the end part component of the stator and the iron core at the end part of the stator in the end area of the stator are further reduced; the other path of cooling gas flows radially through the yoke widening type ventilation duct 2 and enters a fluid area between the rotor windings 7, the fluid speed around the rotor windings 7 is accelerated, the surface heat dissipation coefficient of the rotor windings 7 is increased, the temperature of the rotor windings 7 is effectively reduced, the path of cooling gas enters a stator area through an air gap between the stator core and the rotor core, the heat of the stator core and the stator windings is effectively taken away, and the temperature of the stator core and the stator windings is further reduced; one path of cooling gas flows in the radial direction through the yoke radial ventilation channels 9 between the rotor yokes 1 of each section and flows into the rotor pole body radial ventilation grooves 10, wherein a part of the cooling gas enters the rectangular ventilation holes 15 in the linear section area of the rotor winding 7 through the rotor insulation plate 8 under the action of the rotation of the rotor, so that the temperature of the rotor insulation plate 8 is effectively reduced, the rectangular ventilation holes 15 in the rotor winding 7 can effectively increase the contact area and the surface heat dissipation coefficient of the cooling gas and the rotor winding 7, the temperature of the rotor winding 7 is effectively reduced, the cooling gas coming out of the rectangular ventilation holes 15 and the gas between the rotor winding 7 are converged and then enter the linear section area of the stator through the air gap between the stator and rotor cores, and the other part of the cooling gas flows out of the rotor pole body radial ventilation grooves 10 after cooling the rotor pole body 5, the rotor pole shoe 4 and the damping strips 13, this portion of the cooling gas can significantly increase the velocity of the gas around the rotor pole body 5, the rotor pole shoes 4 and the damping strips 13, further reducing the temperature of the rotor pole body 5, the rotor pole shoes 4 and the damping strips 13. The ventilation channel steel 6 in the yoke radial ventilation channel 9 and the rotor pole body radial ventilation channel 10 can further improve the flow of cooling gas, accelerate the flow velocity of the cooling gas in the pumped storage power generation motor, and improve the ability of the cooling gas to take away the heat of the rotor area. The gradually-widening type ventilation duct 2 for the magnetic yoke, the radial ventilation duct 9 for the magnetic yoke and the radial ventilation channel 10 for the rotor pole body can ensure that the air volume of cooling gas in the linear section area of the rotor of the pumped storage generator motor is more uniformly distributed along the axial direction, the temperature difference and the thermal stress of the rotor magnetic yoke 1, the rotor pole body 5 and the rotor pole shoe 4 in the axial direction are reduced, meanwhile, the cooling gas uniformly distributed in the axial direction enters the stator area, and the temperature difference and the thermal stress of the stator core and the stator winding in the axial direction can be further reduced.
The second embodiment is as follows: the present embodiment is described with reference to fig. 7, and differs from the first embodiment in that the two blades of the V-shaped fan 3 are not connected, the flow rate of the cooling gas in the end region of the pumped-storage generator motor is further increased, and the temperature at the end of the rotor winding 7 is further reduced. Other components and connection relationships are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment is described with reference to fig. 8, and differs from the first embodiment in that the distance between adjacent rotor windings 7 in the circumferential direction is increased, the gas flow rate between the rotor windings 7 is increased, and the temperature of the rotor windings 7 is further reduced. Other components and connection relationships are the same as those in the first embodiment.
The present embodiment is described with reference to fig. 9, and differs from the first embodiment in that yoke axial direction vent holes 16 are formed in the end portions of the rotor yoke 1, so that the contact area between the cooling gas and the end portions of the rotor yoke 1 is increased, and the temperature of the end portions of the rotor yoke 1 is further reduced. Other components and connection relationships are the same as those in the first embodiment.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only for illustrating the principles of the present invention, without departing from the scope of the present invention, the present invention can also have various changes and modifications, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a radial many parallel wind paths inner cooled pumped storage generator motor rotor which characterized in that: the rotor comprises a rotor magnetic yoke (1), a magnetic yoke gradually-widening type ventilation channel (2), a V-shaped fan (3), a rotor pole shoe (4), a rotor pole body (5), a ventilation channel steel (6), a rotor winding (7), a rotor insulation plate (8), a magnetic yoke radial ventilation channel (9), a rotor pole body radial ventilation channel (10), a rotor pressing plate (11), a supporting plate (12), a damping strip (13), a rotor slot wedge (14), a rectangular ventilation hole (15) and a magnetic yoke axial ventilation hole (16), wherein n sections of the rotor magnetic yoke (1) and the rotor pole body (5) are arranged along the axial direction, n-1 sections of the magnetic yoke radial ventilation channel (9) are formed between the rotor magnetic yokes (1), n-1 sections of the rotor pole body radial ventilation channel (10) are formed between the rotor pole bodies (5), the ventilation channel steel (6) is arranged in the magnetic yoke radial ventilation channel (9) and the rotor pole body radial ventilation channel (10), the gradually-widening type ventilation channel (2) of the magnetic yoke is formed in each section of the rotor magnetic yoke (1) along the circumferential direction and the axial direction, the rectangular ventilation holes (15) are formed in the rotor winding (7) along the axial direction, the rectangular ventilation holes (15) correspond to the radial ventilation channels (10) of the n-1 sections of the rotor pole bodies in the axial direction, rotor insulation plates (8) are installed between the rotor winding (7) and the rotor pole bodies (5) and between the rotor pressing plates (11), and the end portions of the two sides of the rotor magnetic yoke (1) are installed through the V-shaped fans (3).
2. The rotor of a radial multiple parallel air path internal cooling pumped-storage generator motor of claim 1, wherein: the number n of the segments of the rotor magnet yoke (1) is 3 to 7; the length of the inlet of the rectangular vent hole (15) is 10mm to 20 mm; the width of the inlet of the rectangular vent hole (15) is 5mm to 10 mm; the width of the radial ventilation channel (10) of the rotor pole body is 6mm to 20 mm; the outlet length of the outer diameter of the gradually-widened magnetic yoke ventilating duct (2) is 280mm to 320 mm; the inlet length of the inner diameter of the magnetic yoke gradually-widening type ventilation duct (2) is 200mm to 240 mm; the width of the gradually-widened magnetic yoke type ventilating duct (2) is 5mm to 15 mm; the included angle a between two blades of the V-shaped fan (3) is 30-50 degrees.
3. The rotor of a radial multiple parallel air path internal cooling pumped-storage generator motor of claim 1, wherein: the two blades of the V-shaped fan (3) are not connected.
4. The rotor of a radial multiple parallel air path internal cooling pumped-storage generator motor of claim 1, wherein: the distance between adjacent rotor windings (7) in the circumferential direction increases.
5. The rotor of a radial multiple parallel air path internal cooling pumped-storage generator motor of claim 1, wherein: the end part of the rotor magnetic yoke (1) is provided with a magnetic yoke axial vent hole (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220016098.XU CN216599176U (en) | 2022-01-05 | 2022-01-05 | Radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220016098.XU CN216599176U (en) | 2022-01-05 | 2022-01-05 | Radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216599176U true CN216599176U (en) | 2022-05-24 |
Family
ID=81633018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220016098.XU Expired - Fee Related CN216599176U (en) | 2022-01-05 | 2022-01-05 | Radial multi-parallel wind path inner-cooling type pumped storage generator motor rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216599176U (en) |
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2022
- 2022-01-05 CN CN202220016098.XU patent/CN216599176U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220524 |