CN209976827U - Centrifugal driving device for cooling tower fan - Google Patents
Centrifugal driving device for cooling tower fan Download PDFInfo
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- CN209976827U CN209976827U CN201920786626.8U CN201920786626U CN209976827U CN 209976827 U CN209976827 U CN 209976827U CN 201920786626 U CN201920786626 U CN 201920786626U CN 209976827 U CN209976827 U CN 209976827U
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Abstract
The utility model relates to the technical field of cooling towers, in particular to a centrifugal driving device of a fan of a cooling tower, which comprises a water chamber for a main shaft of the fan to pass through, wherein blades distributed along the radial direction of the main shaft are arranged in the water chamber; the water chamber is provided with a water inlet end and a water outlet end which are positioned on the same horizontal plane; the water inlet end comprises a round and square reducing pipe body and an arc inlet pipe body which are connected with each other, the water outlet end comprises a transition part and a flow dividing part, and the flow dividing part is equally divided into two sub-runners which can be communicated with a water distribution system of the cooling tower. Circulating water flows to the blades along the tangential direction of the water chamber through the round and square reducing pipe body and the arc inlet pipe body at the water inlet end, so that the blades are fully stressed; meanwhile, the transition part buffers the circulating water flowing out of the water outlet chamber, and the two branch channels of the branch part quickly and uniformly guide the circulating water to the water distribution system, so that the problems of blockage and waste of residual pressure easily caused when the circulating water flows out of the water outlet chamber in the prior art are solved, the quick and stable rotation of the main shaft is ensured, and the cooling effect of the cooling tower is ensured.
Description
Technical Field
The utility model relates to a cooling tower technical field, in particular to centrifugal drive arrangement of cooling tower fan.
Background
The traditional cooling tower is generally provided with a fan driven by a motor, the ventilation of the fan enables circulating water entering the cooling tower to be cooled quickly, and then the circulating water is conveyed to equipment needing water cooling by a water pump and then is introduced into the cooling tower for cooling, so that the purpose of recycling cooling water is achieved. Because the circulation of the cooling water is driven by the water pump, in the design, a large number of factors such as energy loss, certain allowance added when the water pump is selected and the like need to be considered, so that the water pump has a large amount of surplus lift and flow in actual use, the part of energy is not fully utilized and is wasted, and the basic national policy of energy conservation and emission reduction at the present stage of China is not met.
To solve the above problems, chinese patent publication No. CN2916555Y discloses an energy-saving cooling tower with blades driven by a water turbine to dissipate heat, which includes a tower body and fan blades, the water turbine is installed in the tower body and below an air outlet cylinder, a water inlet end is provided on a wall plate, the water inlet end is communicated with the water inlet end of the water turbine, the heat dissipating blades are installed on a blade shaft of the water turbine, the water outlet end of the water turbine is connected with a water distributor, a water-spraying filler is located below the water distributor, a water collecting tray is located below the water-spraying filler, and a water outlet tank is provided on the water collecting tray. This patent utilizes the hydraulic turbine to get up surplus energy utilization in with the water pump and dispels the heat, can reduce the energy consumption effectively, realizes the rational utilization of the energy, but the water discharge velocity of water outlet end play in this patent is slower, can't make the circulating water discharge to the water distribution system fast, and the excess pressure of circulating water is extravagant great, influences the rotational speed of the hydraulic turbine and to the cooling effect who influences the cooling tower.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a centrifugal drive arrangement of cooling tower fan has solved the problem that the end drainage speed of play water is slow, inefficiency.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the centrifugal driving device of the cooling tower fan comprises a water chamber through which a main shaft of the fan can penetrate, wherein a plurality of blades distributed along the radial direction of the main shaft are arranged in the water chamber; the water chamber is provided with a water inlet end and a water outlet end which are positioned on the same horizontal plane; the water outlet end comprises a transition part and a flow dividing part which are communicated with each other, the transition part is positioned between the water chamber and the flow dividing part, and the flow dividing part is provided with two flow dividing channels which can be communicated with a water distribution system of the cooling tower.
The principle of the utility model is that: the water inlet end, the water chamber and the water outlet end are communicated with each other, circulating water enters the water chamber from the water inlet end and then is discharged out of the water chamber from the water outlet end; the circulating water entering the water chamber from the water inlet end has a strong flow velocity, when the circulating water enters the water chamber, the circulating water impacts blades arranged on the main shaft, the blades drive the main shaft to rotate under the action of impact force, so that a fan fixedly connected to the main shaft is driven to rotate, the circulating water entering the cooling tower is subjected to quick heat dissipation and cooling through fan air draft, and a heat dissipation and cooling function of the cooling tower is achieved; the transition part of the water outlet end provides transition for circulating water in the convection water outlet chamber, so that water in the water chamber can quickly flow to the flow dividing part; circulating water flowing through the flow dividing part flows to the two sub-channels, the two sub-channels are communicated with a water distribution system of the cooling tower, one sub-channel is communicated with one side of the water distribution system, the other sub-channel is communicated with the other side of the water distribution system, and the circulating water can flow to the water distribution system quickly and is cooled and dissipated quickly.
The scheme has the advantages that:
1. the water of the water outlet end of being convenient for is discharged efficiently: compare in prior art the play water end only with a pipe connection, because water rotatory flow in the hydroecium, lead to the water in the hydroecium can't be fast by a play water end discharge for the circulating water produces certain resistance and influences the fast rotation of main shaft to the blade rotation, thereby makes the cooling effect of fan reduce. In this application, go out the water end and include transition portion and reposition of redundant personnel portion, transition portion can prevent that the circulating water from going out and blocking with the hydroecium juncture at the water outlet, makes the circulating water flow away fast, and the water of being convenient for go out the water end is discharged high-efficiently to it is extravagant to reduce the residual pressure of circulating water.
2. Circulating water flow direction water distribution system of being convenient for: because the water inlet end and the water outlet end are positioned on the same horizontal plane, the circulating water in the water chamber cannot change the flow direction in the vertical direction, so that the circulating water can quickly circulate in the same horizontal plane, and the circulating water can quickly flow to the water distribution system; meanwhile, the flow dividing part is provided with two flow dividing channels which are respectively communicated with one side of the water distribution system correspondingly, so that circulating water flowing out of the flow dividing channels can rapidly flow to the water distribution system, the circulating water can be rapidly cooled and dissipated, and the cooling effect of the cooling tower is ensured.
3. The water flow is more stable: because the existence of transition portion for the circulating water that flows out by the hydroecium can obtain certain buffering, just the circulating water flows into the subchannel behind the transition portion, just because the cushioning effect of transition portion makes the velocity of flow and the pressure of two subchannel internal circulation roughly equal, thereby guarantees to flow into the water yield of every subchannel roughly equal, makes the circulating water can be fast, evenly, stably flow to the water distribution system, thereby guarantees that circulating water can be cooled off the heat fast, evenly.
Further, the water inlet end is arranged along the tangential direction of the water chamber.
Compare in the end circulating water of intaking and radially flow in the hydroecium along the hydroecium, the circulating water is by less angle flow direction blade, and the blade receives the impact of circulating water less, and the blade is used in the epaxial power of main shaft less, and the circulating water is less to the blade work for main shaft slew velocity is lower and cause the cooling effect not good. In this scheme, the end of intaking sets up along hydroecium tangential direction, and the blade is along the radial setting of main shaft, and when the circulating water was held the flow direction blade by intaking, the circulating water was mutually perpendicular's state with the blade almost, and the blade received the stronger impact of circulating water this moment, finally makes the main shaft receive great thrust and fast turn, makes the fan fast turn with main shaft fixed connection to realize the unblocked and the make full use of excess pressure of circulating water, reach high-efficient radiating purpose.
Further, the water inlet end comprises a round and square reducing pipe body and an arc chamber inlet pipe body, the arc chamber inlet pipe body is located between the round and square reducing pipe body and the water chamber, and the cross section of the arc chamber inlet pipe body is rectangular.
Because the longitudinal section of the rotating range of the blade is rectangular when the blade rotates, and in order to reduce the loss in the transmission process, a pipeline for transmitting circulating water generally adopts a round pipe, if the round pipe is directly introduced into a water chamber, when cylindrical water flowing out of the round pipe rushes to the blade, the water outside the cylindrical water cannot impact the blade, so that part of the circulating water does not work on the blade, and the energy waste is caused. In the scheme, the water inlet end is provided with the round and square reducing pipe body and the arc-shaped chamber inlet pipe body, circulating water flows into the round and square reducing pipe body through the transmission circular pipe and then flows into the arc-shaped chamber inlet pipe body, the cross section of the arc-shaped chamber inlet pipe body is rectangular and corresponds to the longitudinal section of the blade rotating range in rectangular mode, and therefore the circulating water flowing out of the arc-shaped chamber inlet pipe body is fully contacted with the blades, the main shaft is enabled to be stressed to be larger, the fan is enabled to rotate rapidly, and the cooling effect is guaranteed.
Furthermore, the cross-sectional area of the round and square reducing pipe body is larger than that of the arc chamber inlet pipe body.
The cross section area of the round and square reducing pipe body is larger than that of the arc inlet pipe body, and when circulating water flows from the round and square reducing pipe body to the arc inlet pipe body, the cross section area of circulating water is reduced, so that the water flow pressure is increased when water flows from the round and square reducing pipe body to the arc inlet pipe body, and the circulating water drives the blades to rotate quickly; the circular arc transition between the round and square reducing pipe body and the arc inlet pipe body reduces the resistance effect on circulating water during flowing, so that the water energy of the circulating water is fully utilized.
Furthermore, the round and square reducing pipe body and the transition part are provided with flanges.
The end part of the round and square reducing pipe body is provided with a flange plate, and correspondingly, the round main water pipeline connected with the round and square reducing pipe body is also provided with a corresponding flange plate, so that the round and square reducing pipe body is conveniently and fixedly connected with the main water pipeline for conveying circulating water; transition portion department is equipped with the ring flange, and what correspond, reposition of redundant personnel portion department is equipped with the ring flange that matches with transition portion, is convenient for connect reposition of redundant personnel portion and transition portion steadily, can be by dismouting fast when needs are overhauld simultaneously, reduces the time of overhauing.
Furthermore, the ratio of the cross-sectional area of the water outlet end to the cross-sectional area of the water inlet end is 1.1-1.2: 1.
Compared with the method that the cross sectional area of the water outlet end is equal to that of the water inlet end, the circulating water at the water outlet end flows out slowly, and the rotation of the blades is influenced; or the cross-sectional area of the water outlet end is far larger than that of the water inlet end, so that the water outlet pressure of the water outlet end is too low. In the scheme, the ratio of the cross sectional area of the water outlet end to the cross sectional area of the water inlet end is 1.1-1.2: 1, namely the cross section area of the water outlet end is slightly larger than that of the water inlet end, so that circulating water can be quickly discharged from the water outlet end, the outflow water pressure can be ensured, certain pressure is provided when the circulating water flows into a water supplementing system, the quick circulation of the circulating water in the water distributing system is promoted, and the cooling effect of the cooling tower is improved.
Further, the hydroecium is the cake form, and the hydroecium includes upper cover plate, lower apron and fixed connection in the curb plate between upper cover plate and the lower apron, through ring flange fixed connection between upper cover plate and the curb plate.
The water chamber is in a round cake shape, so that the blades have larger rotating space, and meanwhile, the inner wall of the water chamber is smooth, so that circulating water can flow smoothly, and the ineffective consumption of water energy is reduced; through ring flange fixed connection, be convenient for open the upper cover plate fast between upper cover plate and the curb plate to the convenience is overhauld and the part is changed to hydroecium inside.
Furthermore, an upper rotary table and a lower rotary table are arranged in the water chamber, the upper rotary table is fixedly connected to the upper end of the blade, and the lower rotary table is fixedly connected to the lower end of the blade.
Compared with the water chamber in which only the blades are arranged, the blades are generally flaky, and are easy to deform or damage due to impact of circulating water. In this scheme, carousel under the downside fixedly connected with of blade on the upside fixedly connected with of blade, when the blade rotates, go up carousel and carousel down and follow the synchronous rotation of blade to make the blade can bear bigger impact force, the blade is not fragile, and life is longer.
Further, the outside of the water chamber is provided with a reinforcing rib.
The hydroecium outside sets up the strengthening rib, prevents that the hydroecium inner wall from taking place deformation under receiving circulating water impact, guarantees that the appearance of hydroecium is firm for the blade possesses good and stable operational environment.
Further, circular arc transition is formed between the round square reducing pipe body and the arc inlet pipe body, between the arc inlet pipe body and the water chamber, and between the transition part and the water chamber.
Set up to the circular arc transition between each connecting portion, reduce the resistance that the circulating water received at the circulation in-process to reduce the ineffective loss of circulating water energy, make the cooling tower internal energy obtain abundant effectual utilization.
Drawings
Fig. 1 is a schematic view of a centrifugal driving device of a cooling tower fan according to an embodiment of the present invention.
Fig. 2 is a schematic view of the centrifugal driving device of the cooling tower fan according to the embodiment of the present invention, in which the split portion is removed, along the direction K.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the water chamber comprises a water chamber 1, a main shaft 2, an upper cover plate 3, a lower cover plate 4, a side plate 5, reinforcing ribs 6, blades 7, an upper rotary table 8, a lower rotary table 9, a water inlet end 10, a square reducing pipe body 11, an arc chamber inlet pipe body 12, a water outlet end 13, a transition part 14, a flow dividing part 15 and a flow dividing channel 16.
Example one
In the first embodiment, as shown in fig. 1 and 2, a centrifugal driving device for a fan of a cooling tower includes a water chamber 1 through which a main shaft 2 of the fan passes, the main shaft 2 is vertically arranged, the water chamber 1 is in a shape of a circular cake, the water chamber 1 includes an upper cover plate 3, a lower cover plate 4 and a side plate 5 located between the upper cover plate 3 and the lower cover plate 4, the bottom of the side plate 5 and the lower cover 4 are fixedly connected through screws, the top of the side plate 5 and the upper cover 3 are fixedly connected through a flange, and the side plate 5 provides a supporting function for the upper cover plate 3 and the fan above the upper cover; a plurality of reinforcing ribs 6 are welded on the outer side of the side plate 5, and the reinforcing ribs 6 are arranged to enable the structure of the water chamber 1 to be more stable.
Combine fig. 1 and fig. 2, be equipped with blade 7 in the hydroecium 1, blade 7 is along hydroecium 1's radial setting, it is preferably thirty pieces that blade 7 quantity, and the circumference array distribution of main shaft 2 is followed to all blades 7, the upper end welding of blade 7 has last carousel 8, the lower extreme welding of blade 7 has lower carousel 9, simultaneously, go up the 8 upper ends of carousel and pass through screw fixedly connected with ring flange, the ring flange passes through screw fixed connection on main shaft 2, receive the impulsive force effect when blade 7 receives circulating water impact, blade 7 transmits the impact force for main shaft 2 through upper cover plate 3, thereby make main shaft 2 rotate, final drive rotates with main shaft 2 coaxial coupling's fan, the fan realizes convulsions heat dissipation function. Set up the aim at of carousel 8 and lower carousel 9, go up carousel 8 and lower carousel 9 and can follow blade 7 synchronous rotation, rotate the in-process at blade 7, go up carousel 8 and lower carousel 9 and for blade 7 provides the support, make blade 7 be difficult for taking place deformation when bearing external impact force to make blade 7 can move more stably.
As shown in fig. 1, the left side of hydroecium 1 is equipped with the end 10 of intaking that distributes along the 1 outside tangential direction of hydroecium, end 10 and hydroecium 1 intercommunication of intaking, end 10 of intaking includes interconnect's round side reducing body 11 and arc income room body 12, arc income room body 12 is located between round side reducing body 11 and hydroecium 1, screw fixedly connected with ring flange is passed through to the left end of round side reducing body 11, the circular shape water main pipeline tip of carrying the circulating water is equipped with the corresponding ring flange, be convenient for connect round side reducing body 11 and water main pipeline fast, the right-hand member that the arc was gone into room body 12 welds on curb plate 5. In this embodiment, room body 12 integrated into one piece is gone into to circle side reducing body 11 and arc, wherein the passageway cross-sectional area that room body 12 formed is gone into to circle side reducing body 11 and arc reduces gradually, when making the circulating water flow through circle side reducing body 11 and arc and going into room body 12, the cross-sectional area of circulating water reduces gradually, thereby make the velocity of flow of circulating water accelerate, behind the circulating water inflow hydroecium 1, the circulating water is stronger to blade 7's impact force, blade 7 drive 2 pivoted efforts of main shaft are bigger, 2 rotational speeds of main shaft are just faster, thereby make the fan rotational speed faster, the cooling effect is stronger. Meanwhile, the round and square reducing pipe body 11 and the arc inlet pipe body 12 as well as the arc inlet pipe body 12 and the side plate 5 are in arc transition, so that the resistance of circulating water when the circulating water flows through the arc inlet pipe body 12 from the round and square reducing pipe body 11 and enters the water chamber 1 is reduced.
As shown in fig. 1, the cross section of the arc-shaped chamber inlet pipe 12 is rectangular, so that the cross section of the circulating water flowing from the arc-shaped chamber inlet pipe 12 to the water chamber 1 is rectangular, and the longitudinal section of the range swept by the blades 7 in a rotating manner is rectangular, so that the circulating water flowing out of the arc-shaped chamber inlet pipe 12 can be well contacted with the blades 7, and the circulating water can not impact the blades 7 and is wasted.
As shown in fig. 1, a water outlet end 13 is arranged on the right side of the water chamber 1, the water outlet end 13 is communicated with the water chamber 1, the water outlet end 13 comprises a transition portion 14 and a flow dividing portion 15 which are fixedly connected with each other through a flange, the transition portion 14 is welded with the side plate 5, the flow dividing portion 15 is divided into two branch flow passages 16, one branch flow passage 16 is communicated with one side of a water distribution system in the cooling tower, the other branch flow passage 16 is communicated with the other side of the water distribution system in the cooling tower, and circulating water flowing out from the flow dividing portion 15 rapidly flows to the water distribution system through the branch flow passage 16, so that rapid cooling and heat dissipation of the. The transition part 14 and the inner wall of the water chamber 1 are in arc transition, so that the resistance of the circulating water flow when the circulating water flow exits the water chamber 1 is reduced.
The ratio of the sum of the cross sections of the two branch passages 16 to the cross section of the left end of the round reducing pipe body 11 is 1.15:1, so that the integral cross section of the branch passages 16 is larger than the cross section of the water outlet of the water inlet end 10, the branch passages 16 can conveniently and quickly discharge the circulating water to a water distribution system, and the negative influence on the rotation of the blades 7 caused by the blockage of the circulating water at the water outlet end 13 is avoided.
The specific implementation process is as follows:
when the cooling tower works, circulating water flows in from the round and square reducing pipe body 11, the circulating water flows through the arc-shaped chamber-entering pipe body 12 and then flows to the blades 7 at a high speed, the blades 7 are impacted by the circulating water, meanwhile, the impact force is transmitted to the main shaft 2 by the blades 7 to drive the main shaft 2 to rotate, the main shaft 2 drives the fan fixedly connected to the main shaft 2 to rotate when rotating, and the fan rotates to exhaust air; meanwhile, the circulating water flowing through the water chamber 1 flows out from the transition part 14, the flowing circulating water continues to flow to the flow dividing part 15 and then flows to the two flow dividing channels 16 in the flow dividing part 15, the circulating water is guided to a water distribution system of the cooling tower by the flow dividing channels 16 and is cooled and radiated in the water distribution system, and the circulating water is cooled and radiated more quickly by the draught fan, so that the circulating water is cooled finally.
When the maintenance is needed, the maintenance can be performed on the inside of the water chamber 1 only by opening the flange between the upper cover 3 and the side plate 5 and the flange between the transition part 14 and the flow dividing part 15.
Example two
The difference between the second embodiment and the first embodiment is that: the cross-sectional area from the transition part 14 to the cross-sectional area from the branch part 15 is gradually reduced, and when circulating water enters the branch part 15 from the transition part 14, the flow speed of the circulating water is increased due to the reduction of the cross-sectional area of the circulating water, so that the circulating water quickly enters the water distribution system, and the circulating water is quickly cooled.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures or features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. Centrifugal drive arrangement of cooling tower fan, its characterized in that: the fan blade water chamber comprises a water chamber through which a main shaft of a fan can penetrate, and a plurality of blades distributed along the radial direction of the main shaft are arranged in the water chamber; the water chamber is provided with a water inlet end and a water outlet end which are positioned on the same horizontal plane; the water outlet end comprises a transition part and a flow dividing part which are communicated with each other, the transition part is positioned between the water chamber and the flow dividing part, and the flow dividing part comprises two flow dividing channels which can be communicated with a water distribution system of the cooling tower.
2. The cooling tower fan centrifugal drive of claim 1, wherein: the water inlet end is arranged along the tangential direction of the water chamber.
3. The cooling tower fan centrifugal drive of claim 2, wherein: the water inlet end comprises a round and square reducing pipe body and an arc chamber inlet pipe body, the arc chamber inlet pipe body is located between the round and square reducing pipe body and the water chamber, and the cross section of the arc chamber inlet pipe body is rectangular.
4. The cooling tower fan centrifugal drive of claim 3, wherein: the cross-sectional area of the round and square reducing pipe body is larger than that of the arc chamber inlet pipe body.
5. The cooling tower fan centrifugal drive of claim 4, wherein: the round and square reducing pipe body and the transition part are provided with flanges.
6. The cooling tower fan centrifugal drive of claim 3, wherein: the ratio of the cross-sectional area of the water outlet end to the cross-sectional area of the water inlet end is 1.1-1.2: 1.
7. The cooling tower fan centrifugal drive of claim 6, wherein: the hydroecium is the cake form, and the hydroecium includes upper cover plate, lower apron and fixed connection in the curb plate between upper cover plate and the lower apron, through ring flange fixed connection between upper cover plate and the curb plate.
8. The cooling tower fan centrifugal drive of claim 7, wherein: an upper rotary table and a lower rotary table are arranged in the water chamber, and the upper rotary table is fixedly connected to the upper end of the blade and the lower rotary table is fixedly connected to the lower end of the blade.
9. The cooling tower fan centrifugal drive of claim 8, wherein: and reinforcing ribs are arranged on the outer side of the water chamber.
10. The cooling tower fan centrifugal drive of any one of claims 3-9, wherein: circular arc transition is formed between the round square reducing pipe body and the arc inlet pipe body, between the arc inlet pipe body and the water chamber and between the transition part and the water chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920786626.8U CN209976827U (en) | 2019-05-28 | 2019-05-28 | Centrifugal driving device for cooling tower fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920786626.8U CN209976827U (en) | 2019-05-28 | 2019-05-28 | Centrifugal driving device for cooling tower fan |
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| CN209976827U true CN209976827U (en) | 2020-01-21 |
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| CN201920786626.8U Expired - Fee Related CN209976827U (en) | 2019-05-28 | 2019-05-28 | Centrifugal driving device for cooling tower fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110949168A (en) * | 2020-02-24 | 2020-04-03 | 大连理工江苏研究院有限公司 | Water-cooled water drive cooling fills electric pile |
-
2019
- 2019-05-28 CN CN201920786626.8U patent/CN209976827U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110949168A (en) * | 2020-02-24 | 2020-04-03 | 大连理工江苏研究院有限公司 | Water-cooled water drive cooling fills electric pile |
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Effective date of registration: 20200429 Address after: 402160 no.80-2, group 7, Sanxing village, Linjiang Town, Kaizhou District, Chongqing Patentee after: Lei Youwen Address before: 402269 No.1, floor 1, building 1, No.13, Park Avenue, zone B, Luohuang Industrial Park, Luohuang town, Jiangjin District, Chongqing Patentee before: Chongqing JIAHANG Environmental Protection Technology Co.,Ltd. |
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Granted publication date: 20200121 |
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