CN217083367U - Cooling system of wind generating set - Google Patents
Cooling system of wind generating set Download PDFInfo
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- CN217083367U CN217083367U CN202220726156.8U CN202220726156U CN217083367U CN 217083367 U CN217083367 U CN 217083367U CN 202220726156 U CN202220726156 U CN 202220726156U CN 217083367 U CN217083367 U CN 217083367U
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Abstract
The utility model provides a wind generating set cooling system, include: the frame comprises an upper frame body provided with an upper fixing groove and a lower frame body provided with a lower fixing groove; the upper end and the lower end of each cooling tower core body are respectively positioned in the upper fixing groove and the lower fixing groove; the first fixing piece penetrates through a first upper side wall of the upper fixing groove to press the upper end of the cooling tower core body onto a second upper side wall of the upper fixing groove; the second fixing piece penetrates through the first lower side wall of the lower fixing groove to press the lower end of the cooling tower core body onto the second lower side wall of the lower fixing groove. The utility model discloses a set up the concrete structure of frame and through first mounting and second mounting and the upper end and the lower extreme of frame cooperation fixed each cooling tower core respectively to the realization only needs in one side of cooling tower core, can accomplish the installation and the change of cooling tower core, has made things convenient for the installation of cooling tower core and the work of changing.
Description
Technical Field
The utility model relates to a, in particular to wind generating set cooling system.
Background
As onshore wind turbine generators continue to evolve to a greater megawatt level, cooling towers are increasingly being used. However, water leakage from the core of the cooling tower sometimes occurs, and the cooling tower needs to be replaced.
The core body of the existing cooling tower is fixed on the support frame through bolts, and the bolts are required to be completely removed when the core body is replaced. Specifically, because the cooling tower core is fixed on the support frame through the bolt pair wearing, need respectively arrange a staff and operate simultaneously around the cooling tower core during the change, need two staff cooperations just can accomplish the operation, cause the inconvenience of installation and change.
Therefore, how to simplify the installation and replacement of the cooling tower core is a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a wind generating set cooling system in order to overcome the installation of cooling tower core and to change inconvenient defect among the prior art.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
a wind generating set cooling system, characterized in that it includes:
the frame comprises an upper frame body and a lower frame body which are oppositely arranged, wherein an upper fixing groove is formed in the upper frame body, a lower fixing groove is formed in the position, corresponding to the upper fixing groove, of the lower frame body, the upper fixing groove comprises a first upper side wall and a second upper side wall which are oppositely arranged, and the lower fixing groove comprises a first lower side wall and a second lower side wall which are oppositely arranged;
the cooling tower cores are arranged between the upper frame body and the lower frame body in a row, and the upper end and the lower end of each cooling tower core are respectively positioned in the upper fixing groove and the lower fixing groove;
the first fixing piece penetrates through a first upper side wall of the upper fixing groove to press the upper end of the cooling tower core body onto a second upper side wall of the upper fixing groove;
and the second fixing piece penetrates through the first lower side wall of the lower fixing groove to press the lower end of the cooling tower core body onto the second lower side wall of the lower fixing groove.
In this technical scheme, through setting up the concrete structure of frame, and pass the first last lateral wall of last fixed slot through first mounting and compress tightly the upper end of cooling tower core on the lateral wall on the second of last fixed slot, and pass the first lateral wall of lower fixed slot through two mountings and compress tightly the lower extreme of cooling tower core on the second lateral wall of lower fixed slot, can realize only needing one side at the cooling tower core (the first last lateral wall outside of last fixed slot, and the first downside outer wall of lower fixed slot), can accomplish the installation and the change of cooling tower core, that is to say, only need a staff to be located one side of cooling tower core just can accomplish the installation and the change of cooling tower core, the work of the installation and the change of cooling tower core has been made things convenient for.
Preferably, an upper opening is formed in a first upper side wall of the upper fixing groove, and an upper end of each cooling tower core body can enter the upper fixing groove through the upper opening; and/or the presence of a gas in the gas,
and a lower opening is formed in the first lower side wall of the lower fixing groove, and the lower end of each cooling tower core body can enter the lower fixing groove through the lower opening.
In this technical scheme, set up the upper shed of the upper end of accessible cooling tower core on the first upper side wall through last fixed slot to make things convenient for the upper end of cooling tower core to get into or break away from last fixed slot. The lower opening through the lower end of the cooling tower core body is formed in the first lower side wall of the lower fixing groove, so that the lower end of the cooling tower core body can conveniently enter or be separated from the lower fixing groove.
Preferably, the lower opening and the upper opening are correspondingly arranged.
In this technical scheme, through the under shed with the corresponding setting of last opening to the upper end and the lower extreme of convenient cooling tower core can get into fixed slot and under fixed slot respectively simultaneously.
Preferably, the cooling system of the wind generating set further comprises:
the upper baffle plate is arranged on the upper opening in a covering manner;
and the third fixing piece penetrates through the upper baffle plate to press the upper end of the cooling tower core body onto the second upper side wall of the upper fixing groove.
In the technical scheme, the upper baffle is arranged to shield the upper opening; the third fixing piece penetrates through the upper baffle plate to press the upper end of the cooling tower core body onto the second upper side wall of the upper fixing groove so as to fix the upper end of the cooling tower core body below the upper baffle plate; simultaneously, can realize only needing in one side of cooling tower core (the outside of overhead gage), can accomplish the installation and the change of cooling tower core, that is to say, only need one staff to be located one side of cooling tower core just can accomplish the installation and the change that become the cooling tower core that is located the overhead gage below, made things convenient for the installation of cooling tower core and the work of changing.
Preferably, the cooling system of the wind generating set further comprises:
the lower baffle plate is arranged on the lower opening in a covering manner;
and the fourth fixing piece penetrates through the lower baffle plate to press the lower end of the cooling tower core body onto the second lower side wall of the lower fixing groove.
In the technical scheme, the lower opening is shielded by arranging the lower baffle; the fourth fixing piece penetrates through the lower baffle plate to press the lower end of the cooling tower core body below the second lower side wall of the lower fixing groove so as to fix the lower end of the cooling tower core body below the lower baffle plate; simultaneously, can realize only needing in one side of cooling tower core (the outside of baffle down), can accomplish the installation and the change of cooling tower core, that is to say, only need one staff to be located one side of cooling tower core just can accomplish the installation and the change of the cooling tower core that is located baffle below down, made things convenient for the installation of cooling tower core and the work of changing.
Preferably, a gap is formed between the upper end surface of each cooling tower core and the bottom wall of the upper fixing groove.
In this technical scheme, through every set up the clearance between the up end of cooling tower core and the diapire of going up the fixed slot, make things convenient for the both ends of cooling tower core to slide in last fixed slot and lower fixed slot respectively.
Preferably, the frame further comprises an upper pressing plate, the upper pressing plate is pressed on the outer side of the first upper side wall of the upper fixing groove, and at least part of the upper pressing plate is covered on the cooling tower core body.
In this technical scheme, through setting up the top board, can play protection and limiting displacement to the upper end that is located the cooling tower core in the fixed slot.
Preferably, the frame further comprises a lower pressing plate, the lower pressing plate is pressed on the outer side of the first lower side wall of the lower fixing groove and at least partially covers the cooling tower core.
In this technical scheme, through setting up the holding down plate, can play protection and limiting displacement to the lower extreme that is located the cooling tower core in the fixed slot down.
Preferably, the frame further includes two side frame bodies disposed oppositely, upper ends of the two side frame bodies are connected to two sides of the upper frame body, respectively, and lower ends of the two side frame bodies are connected to two sides of the lower frame body, respectively.
In this technical scheme, through setting up the side framework, can play protection and limiting displacement to the cooling tower core that is arranged in the framework in the both sides of last framework and lower framework to make the structure of frame more firm.
Preferably, the side frame is plate-shaped.
In this technical scheme, through setting up the side frame body for platelike in order to further save the cost of manufacture on the firm basis of the structure of guaranteeing the frame.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses a wind generating set cooling system is through setting up the concrete structure of frame, and pass the first lateral wall of going up of fixed slot through first mounting and compress tightly the upper end of cooling tower core on the second of last fixed slot on the lateral wall, and pass the first lateral wall of lower fixed slot through two mountings and compress tightly the lower extreme of cooling tower core on the second lateral wall of lower fixed slot, can realize only needing one side at the cooling tower core, can accomplish the installation and the change of cooling tower core, that is to say, only need one staff to be located one side of cooling tower core and just can accomplish the installation and the change of cooling tower core, the work of the installation and the change of cooling tower core has been made things convenient for.
Drawings
Fig. 1 is a schematic view of a partial front view structure of a cooling system of a wind turbine generator system according to an embodiment of the present invention.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Fig. 3 is a sectional view taken in the direction B-B in fig. 1.
Fig. 4 is a partial structural view of a portion C in fig. 2.
Fig. 5 is a partial structural view of a portion D in fig. 2.
Fig. 6 is a partial structural view of a portion E in fig. 3.
Fig. 7 is a partial structural view of a portion F in fig. 3.
Fig. 8 is a schematic partial top view of a cooling system of a wind turbine generator system according to an embodiment of the present invention.
Fig. 9 is a schematic partial side view of a cooling system of a wind turbine generator system according to an embodiment of the present invention.
Fig. 10 is an installation schematic diagram of a cooling tower core of a cooling system of a wind turbine generator system according to an embodiment of the present invention.
Description of the reference numerals
First upper side wall 131
Second upper side wall 132
First lower sidewall 141
Second lower side wall 142
Detailed Description
The present invention will be more clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1 to 9, the present embodiment provides a cooling system for a wind turbine generator system, which includes: the cooling tower comprises a frame 10, a plurality of cooling tower cores 20, a first fixing piece and a second fixing piece.
The frame 10 includes an upper frame body 11 and a lower frame body 12 which are oppositely arranged, the upper frame body 11 is provided with an upper fixing groove 13, a lower fixing groove 14 is provided at a position of the lower frame body 12 corresponding to the upper fixing groove 13, the upper fixing groove 13 includes a first upper sidewall 131 and a second upper sidewall 132 which are oppositely arranged, and the lower fixing groove 14 includes a first lower sidewall 141 and a second lower sidewall 142 which are oppositely arranged. The upper housing 11 and the lower housing 12 are located at opposite ends of the frame 10 in the height direction H.
A plurality of cooling tower cores 20 are disposed in a row between the upper frame 11 and the lower frame 12, and the upper end and the lower end of each cooling tower core 20 are respectively located in the upper fixing groove 13 and the lower fixing groove 14.
The first fixing member penetrates the first upper sidewall 131 of the upper fixing groove 13 to press the upper end of the cooling tower core 20 against the second upper sidewall 132 of the upper fixing groove 13. The second fixing member penetrates the first lower sidewall 141 of the lower fixing groove 14 to press the lower end of the cooling tower core 20 against the second lower sidewall 142 of the lower fixing groove 14. In this embodiment, the first fixing member and the second fixing member are both the locking bolt 40. The locking bolt 40 is screw-engaged with the nuts 50 previously fixed to the first upper sidewall 131 of the upper fixing groove 13 and the first lower sidewall 141 of the lower fixing groove 14. The nut 50 may be embedded in the first upper sidewall 131 of the upper fixing groove 13 or the first lower sidewall 141 of the lower fixing groove 14, or may be welded to the outer surface of the first upper sidewall 131 of the upper fixing groove 13 or the first lower sidewall 141 of the lower fixing groove 14. In this way, by fixing the nut 50 on the first upper sidewall 131 of the upper fixing groove 13 or the first lower sidewall 141 of the lower fixing groove 14 in advance, the operation step of tightening the locking bolt 40 can be saved, and the advantageous effects of saving labor and improving assembly efficiency can be achieved. In other embodiments, the first fixing element and the second fixing element may also be other fixing elements or limiting elements such as a limiting bump.
In this way, by setting the specific structure of the frame 10, and passing the first upper sidewall 131 of the upper fixing groove 13 through the first fixing member to compress the upper end of the cooling tower core 20 on the second upper sidewall 132 of the upper fixing groove 13, and passing the first lower sidewall 141 of the lower fixing groove 14 through the second fixing member to compress the lower end of the cooling tower core 20 on the second lower sidewall 142 of the lower fixing groove 14, it is possible to achieve that the installation and replacement of the cooling tower core 20 can be completed only on one side of the cooling tower core 20 (the outer side of the first upper sidewall 131 of the upper fixing groove 13, and the first lower outer sidewall of the lower fixing groove 14), that is, only one worker needs to be located on one side of the cooling tower core 20 to complete the installation and replacement of the cooling tower core 20, which facilitates the installation and replacement of the cooling tower core 20.
In the embodiment, the first upper sidewall 131 of the upper fixing groove 13 is opened with an upper opening 135, and the upper end of each cooling tower core 20 can enter the upper fixing groove 13 through the upper opening 135; the first lower sidewall 141 of the lower fixing groove 14 is opened with a lower opening 145, and the lower end of each cooling tower core 20 can enter the lower fixing groove 14 through the lower opening 145. In this way, the upper opening 135 through which the upper end of the cooling tower core 20 can pass is opened in the first upper sidewall 131 of the upper fixing groove 13, so that the upper end of the cooling tower core 20 can be conveniently inserted into or separated from the upper fixing groove 13. The first lower sidewall 141 of the lower fixing groove 14 is opened with a lower opening 145 through which the lower end of the cooling tower core 20 can pass, so that the lower end of the cooling tower core 20 can be easily inserted into or separated from the lower fixing groove 14.
Preferably, the lower opening 145 is disposed corresponding to the upper opening 135. Thus, the upper opening 145 is provided to correspond to the upper opening 135, so that the upper end and the lower end of the cooling tower core 20 can be simultaneously inserted into the upper fixing groove 13 and the lower fixing groove 14, respectively.
The upper fixing groove 13 and the lower fixing groove 14 are integrally formed, and the wall thickness is 6 mm-12 mm. That is, the thicknesses of the first upper sidewall 131 and the second upper sidewall 132 are the same and are both 6mm to 12 mm; the first and second lower sidewalls 141 and 142 have the same thickness, and are both 6mm to 12 mm.
Preferably, the cooling system of the wind generating set further comprises: an upper baffle 31, a third fixing piece, a lower baffle 32 and a fourth fixing piece.
The upper baffle 31 covers the upper opening 135 to shield the upper opening 135 and prevent the cooling tower core 20 located below the upper opening 135 from being separated from the upper fixing groove 13. The lower baffle 32 covers the lower opening 145 to shield the lower opening 145 and prevent the cooling tower core 20 located below the lower opening 145 from escaping from the lower fixing groove 14. The upper baffle 31 may be fixed outside the first upper sidewall 131 by being inserted in an upper limit groove formed at an outer periphery of the upper opening 135; also, the lower baffle 32 may be fixed outside the first lower sidewall 141 by being inserted in a lower catching groove formed at the outer circumference of the lower opening 145. Alternatively, the upper baffle plate 31 and the first upper sidewall 131 may be fixed together, and the lower baffle plate 32 and the first lower sidewall 141 may be fixed together by bolts.
The third fixing piece penetrates through the upper baffle plate 31 to press the upper end of the cooling tower core body 20 onto the second upper side wall 132 of the upper fixing groove 13 so as to fix the upper end of the cooling tower core body 20 below the upper baffle plate 31; meanwhile, the installation and the replacement of the cooling tower core body 20 can be completed only by one side (the outer side of the upper baffle plate 31) of the cooling tower core body 20, that is, the installation and the replacement of the cooling tower core body 20 below the upper baffle plate 31 can be completed only by one side of the cooling tower core body 20, and the installation and the replacement of the cooling tower core body 20 are facilitated.
The fourth fixing member penetrates through the lower baffle 32 to press the lower end of the cooling tower core body 20 against the second lower side wall 142 of the lower fixing groove 14, so as to fix the lower end of the cooling tower core body 20 below the lower baffle 32; meanwhile, the installation and the replacement of the cooling tower core body 20 can be completed only by one side (the outer side of the lower baffle plate 32) of the cooling tower core body 20, namely, the installation and the replacement of the cooling tower core body 20 below the lower baffle plate 32 can be completed only by one side (located on the cooling tower core body 20) of one worker, and the installation and the replacement of the cooling tower core body 20 are facilitated.
In the present embodiment, the third fixing member and the fourth fixing member are both the locking bolts 40. The lock bolt 40 is screw-engaged with nuts 50 previously fixed to the upper and lower plates. It should be noted that the nut 50 may be embedded in the upper baffle or the lower baffle, or may be welded to the outer surface of the upper baffle or the lower baffle. Thus, the nut 50 is fixed on the upper baffle plate and the lower baffle plate in advance, so that the operation step of tightening the locking bolt 40 can be saved, the labor is saved, and the assembly efficiency is improved. In other embodiments, the third fixing element and the fourth fixing element may also be other fixing elements or limiting elements such as a limiting bump.
A gap 60 is provided between the upper end surface of each cooling tower core 20 and the bottom wall 133 of the upper fixing groove. Thus, by providing the gap 60 between the upper end surface of each cooling tower core 20 and the bottom wall 133 of the upper fixing groove, the sliding or movement of the both ends of the cooling tower core 20 in the upper fixing groove 13 and the lower fixing groove 14, respectively, is facilitated. Preferably, the height h of the gap 60 is 20mm to 30 mm.
The lower end surface of each cooling tower core 20 is closely attached to the bottom wall 143 of the lower fixing groove.
In another embodiment, the frame 10 may further include an upper platen and a lower platen. The upper pressing plate is pressed on the outer side of the first upper sidewall 131 of the upper fixing groove 13 and at least partially covers the cooling tower core 20. In this way, by providing the upper pressing plate, the upper end of the cooling tower core body 20 located in the upper fixing groove 13 can be protected and limited. The lower pressing plate is pressed on the outer side of the first lower sidewall 141 of the lower fixing groove 14, and at least partially covers the cooling tower core 20. In this way, by providing the lower platen, the lower end of the cooling tower core 20 located in the lower fixing groove 14 can be protected and limited.
In this embodiment, the frame 10 further includes two side frames 15 disposed oppositely, upper ends of the two side frames 15 are respectively connected to two sides of the upper frame 11, and lower ends of the two side frames 15 are respectively connected to two sides of the lower frame 12. Both sides of upper frame 11 and both sides of lower frame 12 refer to both sides along longitudinal direction L of frame 10. By providing the side frames 15 in this way, the cooling tower cores 20 positioned in the upper frame 11 and the lower frame 12 can be protected and restrained at both sides thereof, and the structure of the frame 10 can be further stabilized. Preferably, the side frame 15 is plate-shaped, so as to further save the manufacturing cost on the basis of ensuring the stable structure of the frame 10.
When the cooling tower core 20 is installed, the upper baffle 31 and the lower baffle 32 are removed, the upper end of the cooling tower core 20 is placed in the upper fixing groove 13 through the upper opening 135, the lower end of the cooling tower core 20 is placed in the lower fixing groove 14 through the lower opening 145, then the cooling tower core 20 is pushed to the final fixing position, and then the upper end and the lower end of the cooling tower core 20 are respectively pressed in the upper fixing groove 13 and the lower fixing groove 14 by the locking bolts 40. When replacing the cooling tower core 20, the upper baffle 31 and the lower baffle 32 are removed, the cooling tower core 20 located below the upper opening 135 and the lower opening 145 is removed, and then the locking bolts 40 of the cooling tower core 20 to be replaced and the cooling tower core 20 located between the cooling tower core 20 to be replaced and the cooling tower core 20 located below the upper opening 135 and the lower opening 145 are loosened, and the cooling tower core 20 to be replaced is pushed to the upper opening 135 and the lower opening 145 to be removed. The upper and lower ends of the cooling tower core 20 are slidably received in the upper and lower fixing grooves 13 and 14, respectively, so that the movement from the fixing position to the upper and lower openings 135 and 145 can be achieved. As shown in fig. 10, when the cooling tower core 20 located at the outermost side is installed, the cooling tower core 20 is pushed to the final fixing position by the external force X after entering the upper fixing groove 13 and the lower fixing groove 14 through the upper opening 135 and the lower opening 145.
The upper opening 135 and the lower opening 145 may be respectively provided at a middle position of the first upper sidewall 131 of the upper fixing groove 13 in the length direction L of the frame 10 and a middle position of the first lower sidewall 141 of the lower fixing groove 14 in the length direction L of the frame 10, so as to achieve more convenient installation or replacement of the cooling tower cores 20 at both ends of the length direction L of the frame 10.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A wind generating set cooling system, characterized in that it comprises:
the frame comprises an upper frame body and a lower frame body which are oppositely arranged, wherein an upper fixing groove is formed in the upper frame body, a lower fixing groove is formed in the position, corresponding to the upper fixing groove, of the lower frame body, the upper fixing groove comprises a first upper side wall and a second upper side wall which are oppositely arranged, and the lower fixing groove comprises a first lower side wall and a second lower side wall which are oppositely arranged;
the cooling tower cores are arranged between the upper frame body and the lower frame body in a row, and the upper end and the lower end of each cooling tower core are respectively positioned in the upper fixing groove and the lower fixing groove;
the first fixing piece penetrates through a first upper side wall of the upper fixing groove to press the upper end of the cooling tower core body onto a second upper side wall of the upper fixing groove;
and the second fixing piece penetrates through the first lower side wall of the lower fixing groove to press the lower end of the cooling tower core body onto the second lower side wall of the lower fixing groove.
2. The wind turbine generator system cooling system of claim 1,
an upper opening is formed in a first upper side wall of the upper fixing groove, and the upper end of each cooling tower core body can enter the upper fixing groove through the upper opening; and/or the presence of a gas in the gas,
and a lower opening is formed in the first lower side wall of the lower fixing groove, and the lower end of each cooling tower core body can enter the lower fixing groove through the lower opening.
3. The wind turbine generator system cooling system of claim 2, wherein the lower opening is disposed in correspondence with the upper opening.
4. The wind park cooling system according to claim 2, wherein the wind park cooling system further comprises:
the upper baffle plate is arranged on the upper opening in a covering manner;
and the third fixing piece penetrates through the upper baffle plate to press the upper end of the cooling tower core body onto the second upper side wall of the upper fixing groove.
5. The wind park cooling system according to claim 2, wherein the wind park cooling system further comprises:
the lower baffle plate is arranged on the lower opening in a covering manner;
and the fourth fixing piece penetrates through the lower baffle plate to press the lower end of the cooling tower core body onto the second lower side wall of the lower fixing groove.
6. The wind turbine generator system of claim 1, wherein a gap is provided between the upper end surface of each cooling tower core and the bottom wall of the upper retaining groove.
7. The wind turbine generator system cooling system of claim 1, wherein the frame further comprises an upper platen that is pressed against the outside of the first upper sidewall of the upper retaining groove and at least partially overlies the cooling tower core.
8. The wind turbine generator system cooling system of claim 1, wherein the frame further comprises a lower platen that is pressed against the exterior of the first lower sidewall of the lower retaining groove and at least partially overlies the cooling tower core.
9. The cooling system of any one of claims 1 to 8, wherein the frame further comprises two side frames disposed oppositely, the upper ends of the two side frames are connected to two sides of the upper frame, and the lower ends of the two side frames are connected to two sides of the lower frame.
10. The wind turbine generator system cooling system of claim 9, wherein the side frame is plate-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220726156.8U CN217083367U (en) | 2022-03-28 | 2022-03-28 | Cooling system of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220726156.8U CN217083367U (en) | 2022-03-28 | 2022-03-28 | Cooling system of wind generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217083367U true CN217083367U (en) | 2022-07-29 |
Family
ID=82553037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220726156.8U Active CN217083367U (en) | 2022-03-28 | 2022-03-28 | Cooling system of wind generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217083367U (en) |
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2022
- 2022-03-28 CN CN202220726156.8U patent/CN217083367U/en active Active
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