CN110792548A - New-generation reaction type water turbine - Google Patents
New-generation reaction type water turbine Download PDFInfo
- Publication number
- CN110792548A CN110792548A CN201911277367.7A CN201911277367A CN110792548A CN 110792548 A CN110792548 A CN 110792548A CN 201911277367 A CN201911277367 A CN 201911277367A CN 110792548 A CN110792548 A CN 110792548A
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- water flow
- water
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- wheel
- cavity
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000006757 chemical reactions by type Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 230000008014 freezing Effects 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 4
- 206010016256 fatigue Diseases 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/04—Machines or engines of reaction type; Parts or details peculiar thereto with substantially axial flow throughout rotors, e.g. propeller turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/126—Rotors for essentially axial flow, e.g. for propeller turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
A new generation of reaction type water turbine and cavity circular cone and impeller ring therein, the axial water flow channel of the water turbine is blocked deliberately, what blocked up is: the axial (downward) flow of the liquid does not divide the length of the lever power arm, does not have holes and does not penetrate, and the low-efficiency water flow energy conversion is carried out at the shortest position of the lever power arm; the figures are: the selection of the axial passing of the water in the water wheel is cancelled, and the water in the water wheel can only pass through the position with the longest lever power arm to carry out the highest-efficiency water flow energy conversion. The traditional propeller type vanes are radially tied and permanently fixed on a wheel shaft, while the new generation reaction water turbine arranges the vanes on the edge of a cavity cone and annularly distributes the vanes into vane rings, and the axial tying is permanently fixed on a double-layer edge (a place (25) where the four-side conversion vanes of centrifugal water flow depend on standing) which is extended in all directions by 360 degrees of the cavity cone blocking an axial water flow channel.
Description
Technical Field
The field of hydraulic turbines for hydroelectric power generation.
Background
Various conventional reaction water turbines.
Disclosure of Invention
If the axial projection of the assembly of the propeller water flow energy conversion wheel blade in the reaction type water turbine is imagined as a multi-ring target diagram for detecting shooting skills, and the multi-ring target diagram is examined by the sight rich in lever knowledge characteristics, the difference of lever characteristics of an inner ring and an outer ring in the target diagram can tell an observer a scientific secret: the water flow energy unit with the same volume and the same mass (the impact force of the movement is generally large) has low energy conversion efficiency when passing through the inner ring, and has high energy conversion efficiency when passing through the outer ring, and the difference between the small energy conversion efficiency and the large energy conversion efficiency is large, so that the situation that the large energy conversion efficiency and the medium energy conversion efficiency are like to be mastered by no people for thousands of years can be realized. The existence of a large and medium background gas is warranted by the theory on fluid pressure, the very powerful fluid pressure theory: in the liquid with the same density and the negligible depth difference, the pressure in the upper, lower, front, rear, left and right six-dimensional directions is equal. Based on the characteristic of liquid pressure, the invention blocks the axial water flow channel of the water turbine deliberately, and the blocking is as follows: the axial (downward) flow of the liquid does not divide the length of the lever power arm, does not have holes and does not penetrate, and the low-efficiency water flow energy conversion is carried out at the shortest position of the lever power arm; the figures are: the selection of the axial passing of the water in the water wheel is cancelled, and the water in the water wheel can only pass through the position with the longest lever power arm to carry out the highest-efficiency water flow energy conversion. The traditional propeller type vanes are radially tied and permanently fixed on a wheel shaft, while the new generation reaction water turbine arranges the vanes on the edge of a cavity cone and annularly distributes the vanes into vane rings, and the axial tying is permanently fixed on a double-layer edge (a place (25) where the four-side conversion vanes of centrifugal water flow depend on standing) which is extended in all directions by 360 degrees of the cavity cone blocking an axial water flow channel. The new generation reaction turbine has no axial water flow channel, so that radial water flow is selectively changed into centrifugal water flow to act on the blade wheel converted from four sides of the centrifugal water flow at the longest position of the lever power arm, and the centrifugal water flow passes through the cavity cone forming the water wheel to the water wheel shaft and then to the generator and the power grid, and the capacity of hydropower is improved by 30%.
In the new generation reaction type water turbine and the cavity cone and the impeller ring thereof, the vertical foot trace lines of N single-piece water flow energy conversion flat impeller blades (24) are not parallel to the arc line of the outer circle of the water wheel and are not parallel to the radius line of the water wheel, the included angle of α formed by the trace lines and the radius line of the water wheel is preferably 55 degrees to 66 degrees, the trace lines and the radius line of the water wheel are distributed in an evenly-spaced ring arrangement mode, the next end is axially tied and permanently fixed on a double-layer edge which can block an axial water flow channel and extends in 360 degrees in an all-around mode (the four-side conversion impeller blades of the centrifugal water flow depend on the position (25) where the blades stand), the last end is permanently fixed and is opposite to the plane of the double-layer edge face which extends along the radius line of the cavity cone, the four-side conversion impeller blades of the centrifugal water flow are positioned between the circles of the inner and the outer circles of the impeller ring of the water flow energy conversion impeller ring which are framed by the (20) and the (25).
In the new generation reaction type water turbine and the cavity cone and another water flow energy conversion impeller ring, the A + B combination of the water flow energy conversion impeller blades of N units [ (A) type air lift wing section profile water flow energy conversion impeller blades (24) and (B) type flat plate water flow energy conversion impeller blades (24) ], A, B are alternated, AB and AB … … are distributed in an equally-spaced and newly-designed ring row, and the next end is axially tied and permanently fixed on a double-layer edge (the centrifugal water flow four-side conversion impeller blades extend in 360 degrees in all directions and can block an axial water flow channel); the upper end is fixedly rooted on the big circle (20) which is parallel and opposite to the brim surface of the double-layer edge extended from the cavity cone along the radius line, and the centrifugal water flow four-side conversion wheel blades are positioned between the inner circle and the outer circle of the water flow energy conversion wheel blade ring in which the frames (20) and (25) are positioned in a fixed grid shape like a nut plane washer. High-speed rapid flows flow flows between the arch back part of the wing section water flow energy conversion wheel blade and the flat plate water flow energy conversion wheel blade, and the rapid flows enable the liquid pressure in the space occupied by the rapid flows to be small; and the low-speed text flow flows between the concave belly parts of the flat plate water flow energy conversion vanes and the wing section water flow energy conversion vanes, and the liquid pressure in the space occupied by the text flow is high due to the text flow. The wing section profile water flow energy conversion wheel blade has the effects of different pressure difference of liquid, the reaction effect of water flow energy acting on the flat plate water flow energy conversion wheel blade, the narrow tube effect and the recoil effect of jet flow at the beginning of flushing the narrow tube, and an innovative technology for comprehensive application of numerous effects is created in a claimed manner.
In the new generation reaction type water turbine and the cavity cone and the blade ring thereof, a guide cone surface (21), a water wheel cone cavity (22) and a multi-layer stacked cavity cone backing plane (23) are combined into a cavity cone body in three, and the cavity cone body is in serial fit with a wheel shaft (12) of the water turbine along the same central line, so that the absolute fit with firm compactness is extremely realized; a flow guide conical surface (21) above the cavity cone is sufficient for resisting axial water flow impact, and a double-layer edge eave surface extending along the cavity cone in 360 degrees in all directions is sufficient for bearing a water flow energy conversion impeller ring in which the frames (20) and (25) are located.
The new generation of reaction type water turbine and the cavity cone and the blade ring thereof are provided with an assembly consisting of (18), (19) and (20) which has the function of freezing the water flow energy conversion blade (24) of the water turbine, and the assembly can stop the machine edge of the water flow energy conversion blade (24) which can generate chronic fatigue damage due to swinging.
In the new generation reaction type water turbine and the cavity cone and the blade ring thereof, the perimeter of the inner circle of the water flow energy four-side conversion blade ring formed by (20), (24) and (25) is multiplied by the axial height area of the blade ring, and the area is equal to the projection area of the circular cone flow guide conical surface (21) of the water wheel center cavity cone.
In the new generation reaction type water turbine and the cavity cone and the blade ring therein, the preferred diameter of the water flow energy four-side conversion blade ring consisting of (20), (24) and (25) is between 0.6M and 6.0M.
Drawings
Fig. 1 is a schematic diagram of a newly-developed water turbine assembly (including a concrete shaft wall (9)) which is cut into two vertical blades of north and south radii and east and west, and then removed from the assembly 1/4. In the figure, 1 is a thrust bearing seat, 2 is a conjoined pull-stop brim connected with a wheel shaft (12), 3 is a back rest wheel connected with the pull-stop brim at the end of a water turbine, 4 is a connecting shaft back rest wheel at the end of a generator, 5 is a push bearing, 6 is a positioning bearing at the upper end of the water turbine shaft, 7 is a positioning bearing seat of a vertical well cover and a water turbine, 8 is a sealing ring for preventing water from overflowing a generator room, 9 is a concrete vertical well wall, 10 is a positioning bearing at the lower end of the water turbine shaft, 11 is a sealing ring guided from a ship propulsion spiral propeller shaft to be used by the ship, 12 is a main shaft of the water turbine, 13 indicates a path with a water inlet and a turning water flow, 14 is a flow guide funnel, 15 is a path for turning the horizontal flow of tail water, 16 is a reinforced pull-stop nut connected with the wheel shaft, 17 is a positioning fastening ring matched with the same serial central line of the wheel shaft with a cavity cone and 18 is a thick round steel plate of a bicycle, 19 is drawing steel between (18) and (20) in the wheel blade stop motion assembly, 20 is a large ring which is used for framing a water flow energy conversion wheel blade and is shaped like a nut plane washer in the wheel blade stop motion assembly, 21 is a centrifugal flow guide conical surface above a water wheel cavity cone, 22 is a water wheel cavity cone, 23 is a bottom plane structural member of the water wheel cavity cone, 25 is an edge brim (where the centrifugal water flow four-side conversion wheel blade stands on) extending along the cavity cone in 360 degrees in all directions, 26 is a fastening and combining screw of the multilayer stacking reinforced water wheel cavity cone bottom plane structural member, and 27 is a tail water flow direction opening.
Fig. 2 is an exploded view of a hollow conical pad bottom plane structural member of a multi-stacked reinforced water wheel, in which 28 is a splined axial center hole, 29 is a bolt hole of a first ring from middle to side of multi-stacked reinforcement, 30 is a bolt hole of a second ring from middle to side of multi-stacked reinforcement, 31 is a bolt hole of a third ring from middle to side of multi-stacked reinforcement, and 32 is a bolt hole of a fourth ring from middle to side of multi-stacked reinforcement.
FIG. 3 is a top view of an A-ring (with a single flat plate water flow energy conversion vane therein); the lower diagram is a section A-A of the four-side conversion impeller ring framed by (20) and (25).
FIG. 4 is a top view of a front view of a B-type vane ring (with aerodynamic lift airfoil section profile water flow energy conversion vanes (A) and flat plate water flow energy conversion vanes (B) inside); the lower diagram is a sectional view B-B of the four-side conversion impeller ring of the water flow energy framed by (20) and (25).
Fig. 5 is a top view of an assembly consisting of (18), (19) and (20) for freezing the flow energy conversion vanes (24) of the turbine, in which 18 is a bicycle hub wheel type thick steel plate circular basin, 19 is a drawing steel, and 20 is the same as (20) of fig. 1; the lower drawing is an enlarged drawing of a partial sampling from the position marked with a five-pointed star on the upper drawing, wherein 18 is a lower wall of a hub wheel type thick steel plate round basin of the bicycle, 19 is the same as (19) of the drawing and (19) of the upper drawing in figure 1, 33 is an angle steel pad with a plane changed from an inclined plane, and 34 is a tightness adjusting nut of a steel pull rod (19).
FIG. 6 is a schematic view of an aero-lift wing section profile water flow energy conversion vane (A) more clearly than in FIG. 4; the lower drawing is a schematic drawing of the drawing steel (19) which is more clear than in fig. 5.
Detailed Description
Because of the high density of water, the energy generated is so high that the resulting impact is also so damaging. Therefore, all materials used to manufacture the new generation of Kabushiki turbine assemblies are steel and iron with relatively high strength. The water flow energy conversion wheel blade (24) is a firm electric welding product due to the fact that one end of the blade is anchored in the blade (25) and the other end of the blade is anchored in the root of the blade (20).
Because the circumference of the inner circle of the water flow energy four-side conversion wheel blade ring formed by (20), (24) and (25) of the water turbine is multiplied by the area of the axial height of the wheel blade ring, the circumference is always equal to the projection area of the conical centrifugal flow guide conical surface (21) of the water wheel central cavity. Therefore, the axial height of the water flow energy conversion impeller blade ring should be increased along with the increase of the axial projected area of the water wheel.
The cavity cone and the blade ring in the new generation reaction type water turbine and the cavity cone cushion bottom plane structural member of the multilayer stacked reinforced water turbine with the diameter of more than 1.6M are connected into a whole by bolts. Only when the diameter of the water flow energy conversion impeller ring composed of (20), (24) and (25) reaches more than 1.6M, the freezing factor of the matching (20) of (18) and (19) is considered. The diameter is below 1.6M, the cavity conical cushion bottom plane structural member can not be stacked in multiple layers, and the adoption of a bicycle hub wheel type thick steel plate round basin (18) and a steel pull rod (19) is not considered.
The principle of benefiting essence is to make water flow in a range not work but to be smooth. How much should the "equal-pitch" blade-to-blade spacing mentioned in this specification? The optimal parameters are found through a comparison test of a plurality of object wind wheels under the conditions of same time, space and wind resource area, the water flow energy conversion vanes A, B are arranged alternately, the AB and AB … … are distributed in a novel equidistant annular row, and the optimal equidistant parameters are obtained in the comparison test process and then are used freely, so that the maximization of the water flow energy conversion efficiency is achieved.
Claims (8)
1. A new generation of reaction type hydraulic turbine and cavity circular cone and impeller circle wherein, its characterized in that: the axial water flow channel of the water turbine is blocked deliberately, and the blockage is as follows: the axial (downward) flow of the liquid does not divide the length of the lever power arm, does not have holes and does not penetrate, and the low-efficiency water flow energy conversion is carried out at the shortest position of the lever power arm; the figures are: the selection of the axial passing of the water in the water wheel is cancelled, and the water in the water wheel can only pass through the position with the longest lever power arm to carry out the highest-efficiency water flow energy conversion; the traditional propeller type vanes are radially tied and permanently fixed on a wheel shaft, while the new generation reaction water turbine arranges the vanes on the edge of a cavity cone and annularly distributes the vanes into vane rings, and the axial tying is permanently fixed on a double-layer edge (a place (25) where the four-side conversion vanes of centrifugal water flow depend on standing) which is extended in all directions by 360 degrees of the cavity cone blocking an axial water flow channel.
2. The new generation of reaction type water turbine and cavity cone and vane ring thereof according to claim 1, characterized in that the vertical trace of N single water flow energy conversion flat vanes (24) is not parallel to the arc line of the outer circle of the water turbine and not parallel to the radius line of the water turbine, preferably the trace line forms an included angle of α degrees to 66 degrees with the radius line of the water turbine, the next end is fixed on the double layer edge extending in 360 degrees of the cavity cone capable of blocking the axial water flow channel, the four side conversion vanes of the centrifugal water flow depend on the location (25) where the four side conversion vanes of the centrifugal water flow stand, the last end is fixed on the large circle (20) parallel to the double layer edge surface extending along the radius line of the cavity cone, the four side conversion vanes of the centrifugal water flow are located between the inner and outer circles of the water flow energy conversion vane ring framed by (20) and (25).
3. The new generation of reaction hydraulic turbine and the cavity cone and the vane ring therein according to claim 1, characterized in that: a + B combination of water flow energy conversion vanes of N units [ (A) type air lift wing section profile water flow energy conversion vanes (24) and (B) type flat plate water flow energy conversion vanes (24) ], A, B are alternated, AB and AB … … are distributed in a ring row with a new pattern at equal intervals, and the next end is axially tied and permanently fixed on a double-layer edge (where the centrifugal water flow four-side conversion vanes depend on the standing place (25)) which can block a cavity cone of an axial water flow channel and extends in 360 degrees in an all-around manner; the upper end is fixedly rooted on the big circle (20) which is parallel and opposite to the brim surface of the double-layer edge extended from the cavity cone along the radius line, and the centrifugal water flow four-side conversion wheel blades are positioned between the inner circle and the outer circle of the water flow energy conversion wheel blade ring in which the frames (20) and (25) are positioned in a fixed grid shape like a nut plane washer.
4. The new generation of reaction hydraulic turbine and the cavity cone and the vane ring therein according to claim 1, characterized in that: the guide conical surface (21), the water wheel conical cavity (22) and the multilayer stacked cavity conical backing bottom plane (23) form a cavity cone in three, and the cavity cone is matched with the same center line of the wheel shaft (12) of the water turbine in series, so that the absolute matching of firm compactness is extremely realized; a flow guide conical surface (21) above the cavity cone is sufficient for resisting axial water flow impact, and a double-layer edge eave surface extending along the cavity cone in 360 degrees in all directions is sufficient for bearing a water flow energy conversion impeller ring in which the frames (20) and (25) are located.
5. The new generation of reaction hydraulic turbine and the cavity cone and the vane ring therein according to claim 1, characterized in that: the assembly consisting of (18), (19) and (20) is used for freezing the water flow energy conversion vanes (24) of the water turbine, and the assembly can cut off the edges of the water flow energy conversion vanes (24) which can generate chronic fatigue damage due to swinging.
6. The new generation of reaction hydraulic turbine and the cavity cone and the blade ring thereof according to claim 1, wherein the flat blades are not parallel to the arc line of the outer circle of the water wheel and are not parallel to the radius line of the water wheel, and preferably the inclined line of the flat blades forms an angle of α degrees with the radius line of the water wheel in the range of 55 degrees to 66 degrees.
7. The new generation of reaction hydraulic turbine and the cavity cone and the vane ring therein according to claim 1, characterized in that: the circumference of the inner circle of the water flow energy four-side conversion wheel blade ring formed by the components (20), (24) and (25) is multiplied by the area of the axial height of the wheel blade ring, and the area is equal to the projection area of the conical flow guide conical surface (21) of the water wheel central cavity.
8. The new generation of reaction hydraulic turbine and the cavity cone and the vane ring therein according to claim 1, characterized in that: the preferred diameter of the water flow energy four-side conversion impeller blade ring composed of (20), (24) and (25) is 0.6M-6.0M.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019105001395 | 2019-06-01 | ||
| CN201910500139.5A CN110206674A (en) | 2019-06-01 | 2019-06-01 | A kind of Cenozoic reaction turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110792548A true CN110792548A (en) | 2020-02-14 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910500139.5A Pending CN110206674A (en) | 2019-06-01 | 2019-06-01 | A kind of Cenozoic reaction turbine |
| CN201911277367.7A Pending CN110792548A (en) | 2019-06-01 | 2019-12-06 | New-generation reaction type water turbine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910500139.5A Pending CN110206674A (en) | 2019-06-01 | 2019-06-01 | A kind of Cenozoic reaction turbine |
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| CN (2) | CN110206674A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113217258A (en) * | 2021-05-02 | 2021-08-06 | 李新亚 | Backflushing type water turbine power generation system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2631708A1 (en) * | 2008-05-22 | 2008-10-21 | Robert Jean Druzin | Hydroelectricity water-wheel turbine system |
| CN107401478A (en) * | 2016-05-20 | 2017-11-28 | 唐华山 | The fan blade circle of centrifugal flow four side conversion of the circular cone wind wheel circumferential edge along the top of a wall that keeps out the wind |
-
2019
- 2019-06-01 CN CN201910500139.5A patent/CN110206674A/en active Pending
- 2019-12-06 CN CN201911277367.7A patent/CN110792548A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2631708A1 (en) * | 2008-05-22 | 2008-10-21 | Robert Jean Druzin | Hydroelectricity water-wheel turbine system |
| CN107401478A (en) * | 2016-05-20 | 2017-11-28 | 唐华山 | The fan blade circle of centrifugal flow four side conversion of the circular cone wind wheel circumferential edge along the top of a wall that keeps out the wind |
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| Publication number | Publication date |
|---|---|
| CN110206674A (en) | 2019-09-06 |
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Application publication date: 20200214 |