CN210896950U - Wireless charging device - Google Patents
Wireless charging device Download PDFInfo
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- CN210896950U CN210896950U CN201921554339.0U CN201921554339U CN210896950U CN 210896950 U CN210896950 U CN 210896950U CN 201921554339 U CN201921554339 U CN 201921554339U CN 210896950 U CN210896950 U CN 210896950U
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Abstract
The utility model relates to a wireless charging device, which belongs to the technical field of wireless charging, comprising a wireless charging coil, wherein the wireless charging coil comprises an excitation layer, a first coil annular loop and a second coil annular loop, the first coil annular loop is arranged on the upper end surface of the excitation layer in parallel, an electromagnetic shielding plate made of magnetic materials is arranged on the periphery of the first coil annular loop, the electromagnetic shielding plate is fixed on the upper end surface of the excitation layer, and the height of the electromagnetic shielding plate on the upper end surface of the excitation layer is higher than the height of the first coil annular loop and the height of the third coil annular loop on the upper end surface of the excitation layer; the second coil annular loop is arranged around the upper end surface, the lower end surface and two side surfaces of the excitation layer; the edge of the second coil loop on the upper end surface is arranged close to the edge of the first coil loop. The utility model discloses a wireless charging device can improve wireless charging efficiency, can also shield the radiation scattering that the charging coil produced at the transmission energy in-process, plays good electromagnetic shield effect.
Description
Technical Field
The utility model belongs to the technical field of wireless charging, concretely relates to wireless charging device.
Background
With the development of modern society, electronic devices are continuously updated, and people put higher demands on the performance and functions of the electronic devices. The traditional charging mode brings a lot of inconvenience for people's life when using, and wireless charging mode takes place in due charge, has solved the inconvenience that traditional charging mode adopted the charging wire rod to bring. The wireless charging mode mainly uses the electromagnetic induction principle, does not need to charge the wire rod and contact with mobile phone equipment, convenient and fast, but the drawback is that charge efficiency is lower than traditional wired charging mode, and how to improve charge efficiency is a difficult problem in the wireless charging technology.
A wireless charging device for wireless power transmission among the prior art, including wireless transmitter and the wireless receiver that charges, and all be provided with wireless charging coil, this wireless charging coil includes the excitation layer and sets up the plane coil on the excitation layer, and the plane coil coiling forms coil loop. The wireless charging coil of the wireless charging transmitter is used for electrifying to generate an electromagnetic signal, and the wireless charging coil of the wireless charging receiver is used for inducing the electromagnetic signal, so that current is generated for the electric equipment. The defects of the wireless charging coil in the prior art are that the wireless charging efficiency is low and the practicability is poor.
The application publication number is CN110189897A, and the application of the Chinese utility model discloses a wireless charging coil, which utilizes the same insulated wire to design two coil loop circuits, so that the magnetic field generated after the wireless charging coil is electrified is strengthened, and the wireless charging efficiency is relatively improved, however, in the process of energy transmission of the wireless charging coil, the coil loop circuits can generate radiation scattering, which causes electromagnetic radiation pollution and is not beneficial to the environmental safety outside the wireless charging operation area; in addition, the coil loop circuit can generate radiation scattering, and the wireless charging efficiency can also be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wireless charging device for solve the problem that current wireless charging coil charging efficiency reduces in wireless charging process.
Based on the above purpose, a first technical solution of the wireless charging device is as follows:
the wireless charging coil comprises an excitation layer and a coil annular loop formed by winding the same insulated conducting wire, wherein the coil annular loop comprises a first coil annular loop and a second coil annular loop, the first coil annular loop is arranged on the upper end surface of the excitation layer, the plane of the first coil annular loop is parallel to the excitation layer, and the second coil annular loop is arranged around the upper end surface, the lower end surface and two side surfaces of the excitation layer; and after the excitation layer is electrified, the current direction of the edge of the second coil annular loop on the upper end surface is consistent with that of the edge of the first coil annular loop, the edge of the second coil annular loop on the upper end surface is arranged nearby the edge of the first coil annular loop, the periphery of the first coil annular loop is provided with an electromagnetic shielding plate made of a magnetic conductive material, the electromagnetic shielding plate is fixed on the upper end surface of the excitation layer, and the height of the electromagnetic shielding plate on the upper end surface of the excitation layer is higher than that of the first coil annular loop on the upper end surface of the excitation layer.
The beneficial effects of the above technical scheme are:
the utility model discloses a wireless charging device is owing to arranged the electromagnetic shield board in the periphery of first coil annular circuit, and the electromagnetic shield board highly is higher than the height of first coil annular circuit at excitation layer up end, can shield the radiation scattering that the charging coil produced at the transmission energy in-process, plays good electromagnetic shield effect. And due to the effect of the electromagnetic shielding plate, the magnetic circuit area of the wireless charging coil after being electrified is increased, the magnetic field intensity of a working area (used for transmitting electric energy) of the wireless charging coil after being electrified is greatly increased, and the efficiency of electric energy transmission is favorably improved.
In order to improve the electromagnetic shielding effect, the electromagnetic shielding plate is made of ferrite material, and the ferromagnetic material can greatly increase the magnetic field in the working area and reduce the magnetic field in the non-working area.
In order to improve the electromagnetic shielding effect, the excitation layer is made of ferrite material, and the electromagnetic shielding plate and the excitation layer are integrated.
Further, the excitation layer is fixedly bonded with the electromagnetic shielding plate. As another embodiment, a fixture of a non-ferromagnetic material may be used for fixing. The direct bonding installation is more convenient and faster, and simultaneously, the used materials are reduced.
In order to improve the electromagnetic shielding effect, further, the excitation layer and the periphery of the electromagnetic shielding plate are sleeved with a U-shaped aluminum plate shielding layer, the aluminum plate belongs to non-ferromagnetic metal, and the shielding mechanism of the non-ferromagnetic material is that a reverse magnetic field is generated by eddy current generated inside the material and is counteracted with a magnetic field between a primary source to play a shielding role. Therefore, the aluminum plate shielding layer can effectively shield the magnetic field leakage of the non-working area, reduce the magnetic field index of the non-working area, and also can enhance the magnetic field of the working area, so that the coupling is tighter, and further the aluminum plate shielding layer and the electromagnetic shielding plate form a double-layer shielding mechanism.
Based on the above purpose, a second technical solution of the wireless charging device is as follows:
the wireless charging coil comprises an excitation layer and a coil annular loop formed by winding the same insulated conducting wire, wherein the coil annular loop comprises a first coil annular loop and a third coil annular loop, and a second coil annular loop and a fourth coil annular loop, the first coil annular loop and the third coil annular loop are adjacently arranged on the upper end surface of the excitation layer, and the planes of the first coil annular loop and the third coil annular loop are parallel to the excitation layer; the second coil annular loop and the fourth coil annular loop are arranged adjacently and surround the upper end surface, the lower end surface and the two side surfaces of the excitation layer; after the power is switched on, the edges of the second coil annular loop and the fourth coil annular loop on the upper end surface are consistent with the current directions of the edges of the first coil annular loop and the third coil annular loop, the edge of the second coil annular loop on the upper end surface is arranged nearby the edge of the first coil annular loop, and the edge of the fourth coil annular loop on the upper end surface is arranged nearby the edge of the third coil annular loop;
and the electromagnetic shielding plates are fixed on the upper end surface of the excitation layer, and the height of the electromagnetic shielding plates on the upper end surface of the excitation layer is higher than that of the first coil annular loop and the third coil annular loop on the upper end surface of the excitation layer.
The beneficial effects of the above technical scheme are:
the utility model discloses a wireless charging device is owing to arranged the electromagnetic shield board in first coil annular circuit and third coil annular circuit's periphery, and the electromagnetic shield board highly is higher than first coil annular circuit, third coil annular circuit in the height of excitation layer up end at excitation layer up end, can shield the radiation scattering that the charging coil produced at the transmission energy in-process, plays good electromagnetic shield effect. And due to the effect of the electromagnetic shielding plate, the magnetic circuit area of the wireless charging coil after being electrified is increased, the magnetic field intensity of a working area (used for transmitting electric energy) of the wireless charging coil after being electrified is greatly increased, and the efficiency of electric energy transmission is favorably improved.
In order to improve the electromagnetic shielding effect, the electromagnetic shielding plate is made of ferrite material, and the ferromagnetic material can greatly increase the magnetic field in the working area and reduce the magnetic field in the non-working area.
In order to improve the electromagnetic shielding effect, the excitation layer is made of ferrite material, and the electromagnetic shielding plate and the excitation layer are integrated.
Further, the excitation layer is fixedly bonded with the electromagnetic shielding plate. As other embodiments, the fixture can also be fixedly installed by using a non-ferromagnetic material, so that the direct bonding installation is more convenient and quicker, and the use of materials is reduced.
In order to improve the electromagnetic shielding effect, further, the excitation layer and the periphery of the electromagnetic shielding plate are sleeved with a U-shaped aluminum plate shielding layer, the aluminum plate belongs to non-ferromagnetic metal, and the shielding mechanism of the non-ferromagnetic material is that a reverse magnetic field is generated by eddy current generated inside the material and is counteracted with a magnetic field between a primary source to play a shielding role. Therefore, the aluminum plate shielding layer can effectively shield the magnetic field leakage of the non-working area, reduce the magnetic field index of the non-working area, and also can enhance the magnetic field of the working area, so that the coupling is tighter, and further the aluminum plate shielding layer and the electromagnetic shielding plate form a double-layer shielding mechanism.
Drawings
Fig. 1 is a schematic cross-sectional view of the wireless charging coil and electromagnetic shielding structure of the present invention;
fig. 2 is a top view of a wireless charging coil of the present invention;
fig. 3 is a side view of a wireless charging coil of the present invention;
fig. 4 is an application scenario diagram of the wireless charging coil of the present invention;
fig. 5 is a schematic cross-sectional view of another wireless charging coil and electromagnetic shielding structure of the present invention;
figure 6 is a top view of another wireless charging coil of the present invention;
the reference numerals of the drawings are explained below:
1-a first coil annular loop, 2-a second coil annular loop, 3-a third coil annular loop, 4-a fourth coil annular loop, 5-an excitation layer, 1-a side of the first coil annular loop, 2-1-a side of the second coil annular loop on an upper end face of the excitation layer, 3-1-a side of the third coil annular loop, 4-1-a side of the fourth coil annular loop on the upper end face of the excitation layer, 6-a wireless charging transmitter, 7-a wireless charging receiver, 8-1, 8-2-an electromagnetic shielding plate, 9-a U-shaped aluminum plate shielding layer.
Detailed Description
The utility model discloses a wireless charging device both can be the wireless transmitter that charges, can be the wireless receiver that charges, just the utility model discloses a wireless charging device's improvement lies in, provides a new wireless charging coil and electromagnetic shield plate. The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
The first embodiment is as follows:
a wireless charging device as shown in fig. 1, comprising a wireless charging coil, electromagnetic shielding plates (8-1, 8-2) and a U-shaped aluminum plate shielding layer 9, wherein the wireless charging coil comprises an excitation layer 5, and a first coil loop 1, a second coil loop 2, a third coil loop 3 and a fourth coil loop 4 which are wound by the same insulated conducting wire. To describe the positional relationship of the four coil loops in terms of aspects, a coordinate system is drawn in fig. 1 with the perpendicular bisector of the excitation layer as the y-axis and the horizontal direction along the excitation layer as the x-axis.
As shown in fig. 1, the four coil loops are respectively located in four quadrants, and the winding shapes are all rectangular. The first coil annular loop 1 and the third coil annular loop 3 are adjacently arranged on the upper end face of the excitation layer 5, and the planes of the first coil annular loop 1 and the third coil annular loop 3 are parallel to the excitation layer 5. In addition, electromagnetic shielding plates (8-1 and 8-2) are arranged on the peripheries of the first coil annular loop 1 and the third coil annular loop 3, and a U-shaped aluminum plate shielding layer 9 is sleeved on the peripheries of the excitation layer 5 and the electromagnetic shielding plates (8-1 and 8-2). The electromagnetic shield plate is a ferrite shield plate (i.e. a shield plate made of ferrite material such as NiZn ferrite, MnZn ferrite, etc.) disposed at the end of the excitation layer, and as shown in fig. 1, the height of the ferrite shield plate on the upper end surface of the excitation layer is higher than the height of the first coil loop and the third coil loop on the upper end surface of the excitation layer. In another embodiment, the height of the ferrite shield plate on the upper end surface of the field layer may be set to be equal to the height of the first coil loop and the third coil loop on the upper end surface of the field layer, so that the magnetic shielding effect can be achieved.
The second coil loop 2 and the fourth coil loop 4 are arranged around the upper end face, the lower end face and the two side faces of the excitation layer 5, wherein the second coil loop 2 and the fourth coil loop 4 are adjacent to each other, and the plane of the second coil loop 2 is parallel to the plane of the fourth coil loop 4. And after the wireless charging coil is electrified, the current direction of the edge 2-1 of the second coil annular loop on the upper end surface of the excitation layer and the current direction of the edge 4-1 of the fourth coil annular loop on the upper end surface of the excitation layer are consistent with the current direction of the edge 3-1 of the first coil annular loop 1-1 and the current direction of the edge 3-1 of the third coil annular loop. The side 2-1 of the second coil annular loop on the upper end surface of the excitation layer is arranged nearby the side 1-1 of the first coil annular loop, and the side 4-1 of the fourth coil annular loop on the upper end surface of the excitation layer is arranged nearby the side 3-1 of the third coil annular loop.
Two adjacent grooves are formed in the upper end face of the excitation layer 5 and used for placing insulated wires of the second coil annular loop 2 and the fourth coil annular loop 4 respectively so as to guarantee the smooth arrangement of the first coil annular loop 1 and the third coil annular loop 3. In addition, when the number of turns of the second coil loop 2 and the fourth coil loop 4 is multiple, the insulated conducting wire of the second coil loop 2 is placed in one groove, and the insulated conducting wire of the fourth coil loop 4 is placed in the other groove, so that the reinforcing effect of the magnetic field after the wireless charging coil is electrified is improved.
The terminal surface is higher than the coil upper surface about the excitation layer 5, is used for wrapping up the insulated wire of first coil annular circuit 1 and third coil annular circuit 3 respectively to guarantee the level and smooth design of coil upper surface, also can increase the magnetic circuit area simultaneously and make the magnetic field intensity of workspace increase by a wide margin, be favorable to improving electric energy transmission's efficiency.
In fig. 1, an oval mark area is defined as a coil central area, four coil loops are wound as shown in fig. 2 and 3, an input end of a second coil loop 2 enters in a direction indicated by an arrow in fig. 2, the excitation layer 5 is wound by a lower end surface of the excitation layer 5 in a counterclockwise direction (viewed from the x-axis forward direction), a certain number of turns (i.e., the number of turns) is wound, the winding of the first coil loop 1 is turned in the coil central area of the excitation layer 5, the first coil loop 1 is wound in a counterclockwise direction (viewed from the y-axis forward direction) in a circular stack for a certain number of turns, the winding of the third coil loop 3 is turned from the coil central area of the excitation layer 5, the winding of the third coil loop 3 is turned in a clockwise direction (viewed from the y-axis forward direction) in a circular stack for a certain number of turns, the winding of the fourth coil loop 4 is turned from the coil central area of the excitation layer 5, the fourth coil loop 4 is wound around the field layer 5 in a counterclockwise direction (when viewed from the x-axis in the forward direction) for a certain number of turns around the field layer 5.
When the coil is wound, the winding directions of the parts in the central area of the coil are consistent, namely the winding directions of the side 1-1 of the first coil loop, the side 3-1 of the third coil loop, the side 4-1 of the fourth coil loop on the upper end face of the excitation layer and the side 2-1 of the second coil loop on the upper end face of the excitation layer are consistent, in fig. 1, the current directions are represented by points and crosses (the points indicate that the plane vertical to fig. 1 points from inside to outside of the figure, and the crosses indicate that the plane vertical to fig. 1 points from outside of the figure), wherein the current directions of the sides 1-1, 2-1, 3-1 and 4-1 in the central area of the coil are points, and fig. 1 shows that the current directions are consistent. Of course, all the current directions of the sides in the coil central region may be forked. In addition, the winding forms of the four coil annular loops can be stacked and tiled, and the central magnetic circuit can be reinforced.
In the wireless charging coil of the embodiment, the plane of the upper-layer coil loop is perpendicular to the plane of the lower-layer coil loop, that is, the plane of the first coil loop is perpendicular to the plane of the second coil loop, the plane of the third coil loop is perpendicular to the plane of the fourth coil loop, and when the wireless charging coil is charged, the directions of currents passing through the insulated wires in the central area of the coil are consistent, and the generated magnetic fields are mutually strengthened, thereby being beneficial to improving the efficiency of wireless charging energy transmission.
The wireless charging coil of the embodiment can be used as a transmitting coil in a wireless charging transmitter and a receiving coil in a wireless charging receiver, and when the wireless charging coil is used as the transmitting coil, the wireless charging device of the embodiment is the wireless charging transmitter; when the receiving coil is used, the wireless charging device of the present embodiment is a wireless charging receiver. The wireless charging method can be applied to wireless charging of automobile batteries and wireless charging of portable equipment, such as wireless charging of mobile phones. For example, applied to a wireless charging system including a wireless charging transmitter 6 and a wireless charging receiver 7 having a wireless charging coil and an electromagnetic shielding structure, as shown in fig. 4.
In this embodiment, the ferrite shield and the field layer are integrally designed, and the field wire (i.e. the insulated wire of the coil loop, and the insulated wire of the field layer) is completely embedded. Therefore, the magnetic field intensity of the working area is greatly increased by increasing the area of the magnetic circuit, the efficiency of electric energy transmission is favorably improved, the magnetic field of the non-working area is reduced, the leakage magnetic field shielding around the wireless charging coil is enhanced, and EMF (electromagnetic field) testing is favorably realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. For example, in the present embodiment, the ferrite shield plate is provided only at the end of the excitation layer, and as another embodiment, the ferrite shield plate having a size corresponding to the lower end surface of the excitation layer may be provided to improve the electromagnetic shielding effect.
For example, for the wireless charging coil in this embodiment, the side 4-1 of the fourth coil loop on the upper end surface of the excitation layer is parallel to the side 2-1 of the second coil loop on the upper end surface of the excitation layer.
For another example, the winding shape of the first coil loop and the third coil loop in this embodiment is rectangular, and as another embodiment, the winding shape may also be elliptical, and at this time, a section of the insulated conducting wire in the first coil loop, which is close to the edge of the second coil loop on the upper end face of the excitation layer, may be used as the edge of the first coil loop; similarly, a section of the insulated conducting wire in the third coil loop, which is close to the edge of the fourth coil loop on the upper end surface of the excitation layer, is used as the edge of the third coil loop.
Example two:
the wireless charging device of this embodiment is as shown in fig. 5 and fig. 6, and includes wireless charging coil and electromagnetic shield 8, and the wireless charging coil includes excitation layer 5 and the coil loop that is formed by the coiling of same insulated wire, and the coil loop includes first coil loop 1 and second coil loop 2, and wherein, first coil loop 1 sets up on the up end of excitation layer 5, and the plane that first coil loop 1 located is parallel with excitation layer 5.
The second coil loop 2 is arranged around the upper end surface, the lower end surface and two side surfaces of the excitation layer 5; after the power is switched on, the current direction of the edge 2-1 of the second coil annular loop 2 on the upper end surface is consistent with the current direction of the edge 1-1 of the first coil annular loop, and the edge 2-1 of the second coil annular loop on the upper end surface is arranged nearby the edge 1-1 of the first coil annular loop. The upper end face of the excitation layer 5 is provided with a groove, and when the number of turns of the second coil loop 2 is multiple, the insulated conducting wire of the second coil loop 2 is placed in the groove.
The left and right ends of excitation layer 5 are provided with ferrite shield 8 (electromagnetic shield), and ferrite shield 8 highly is higher than the height of first coil annular loop 1 at the excitation layer up end, is used for wrapping up the insulated wire of first coil annular loop 1 respectively to guarantee the level and smooth design of coil upper surface, also can increase the magnetic field intensity that the magnetic circuit area made the workspace simultaneously and increase by a wide margin, is favorable to improving electric energy transmission's efficiency.
In this embodiment, the ferrite shield 8 and the excitation layer 5 are designed as an integrated structure to increase the magnetic shielding effect, and the U-shaped aluminum shield 9 is sleeved on the peripheries of the layer excitation layer 5 and the electromagnetic shield 8.
Since the wireless charging coil of this embodiment is actually a half of the wireless charging coil in the first embodiment of the coil, and is only a left half or a right half of the structure bounded by the y-axis in fig. 1, the detailed description thereof is omitted.
It should be noted that the terms of left, right, up and down, etc. are used in the present invention only as relative terms to each other, and should not be construed as limiting. Just the utility model discloses the parallel that mentions is relative position relation under the ideal state, and practical application be close parallel can.
Claims (10)
1. A wireless charging device comprises a wireless charging coil, wherein the wireless charging coil comprises an excitation layer and a coil annular loop formed by winding the same insulated conducting wire, the coil annular loop comprises a first coil annular loop and a second coil annular loop, the first coil annular loop is arranged on the upper end surface of the excitation layer, the plane of the first coil annular loop is parallel to the excitation layer, and the second coil annular loop is arranged around the upper end surface, the lower end surface and two side surfaces of the excitation layer; and after the excitation layer is electrified, the current direction of the edge of the second coil annular loop on the upper end surface is consistent with that of the edge of the first coil annular loop, and the edge of the second coil annular loop on the upper end surface is arranged nearby the edge of the first coil annular loop.
2. The wireless charging apparatus of claim 1, wherein the electromagnetic shield is a shield of ferrite material.
3. The wireless charging device according to claim 1, wherein the excitation layer is an excitation layer made of ferrite material, and the electromagnetic shield plate and the excitation layer are an integrated structure.
4. The wireless charging apparatus according to claim 1, wherein the excitation layer is adhesively fixed to the electromagnetic shield plate.
5. The wireless charging device of claim 1, wherein a U-shaped aluminum shield is sleeved on the excitation layer and the electromagnetic shield.
6. A wireless charging device comprises a wireless charging coil, wherein the wireless charging coil comprises an excitation layer and a coil annular loop formed by winding the same insulated conducting wire, the coil annular loop comprises a first coil annular loop and a third coil annular loop, and a second coil annular loop and a fourth coil annular loop, wherein the first coil annular loop and the third coil annular loop are adjacently arranged on the upper end surface of the excitation layer, and the planes of the first coil annular loop and the third coil annular loop are parallel to the excitation layer; the second coil annular loop and the fourth coil annular loop are arranged adjacently and surround the upper end surface, the lower end surface and the two side surfaces of the excitation layer; after the power is switched on, the edges of the second coil annular loop and the fourth coil annular loop on the upper end surface are consistent with the current directions of the edges of the first coil annular loop and the third coil annular loop, the edge of the second coil annular loop on the upper end surface is arranged nearby the edge of the first coil annular loop, and the edge of the fourth coil annular loop on the upper end surface is arranged nearby the edge of the third coil annular loop; the electromagnetic shielding plate is fixed on the upper end surface of the excitation layer, and the height of the electromagnetic shielding plate on the upper end surface of the excitation layer is higher than that of the first coil annular loop and the third coil annular loop on the upper end surface of the excitation layer.
7. The wireless charging apparatus of claim 6, wherein the electromagnetic shield is a shield of ferrite material.
8. The wireless charging device according to claim 6, wherein the excitation layer is made of ferrite material, and the electromagnetic shield plate and the excitation layer are integrated.
9. The wireless charging apparatus according to claim 6, wherein the excitation layer is adhesively fixed to the electromagnetic shield plate.
10. The wireless charging device of claim 6, wherein a U-shaped aluminum shield is sleeved on the excitation layer and the electromagnetic shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921554339.0U CN210896950U (en) | 2019-09-18 | 2019-09-18 | Wireless charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921554339.0U CN210896950U (en) | 2019-09-18 | 2019-09-18 | Wireless charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210896950U true CN210896950U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921554339.0U Active CN210896950U (en) | 2019-09-18 | 2019-09-18 | Wireless charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210896950U (en) |
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2019
- 2019-09-18 CN CN201921554339.0U patent/CN210896950U/en active Active
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