CN211266961U - Camera module and heating device - Google Patents
Camera module and heating device Download PDFInfo
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- CN211266961U CN211266961U CN202020181005.XU CN202020181005U CN211266961U CN 211266961 U CN211266961 U CN 211266961U CN 202020181005 U CN202020181005 U CN 202020181005U CN 211266961 U CN211266961 U CN 211266961U
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Abstract
The utility model discloses a camera module, include: a camera assembly; the camera fixing cavity is internally provided with a camera component; the front end part of the camera fixing cavity is provided with an air hole; the active radiator is arranged at the rear end part of the camera fixing cavity and is provided with a first radiating channel, the air hole, the camera fixing cavity and the first radiating channel form an airflow channel, and the camera assembly is positioned in the airflow channel; the camera assembly shoots images in the heating cavity through the first heat-insulation euphotic layer. The camera module can take the initiative the radiator directly give off high temperature environment's heat to the outside, and the radiating effect is showing, can also avoid filths such as dust and oil smoke to gather in the camera module, makes the camera module can be arranged in high temperature environment.
Description
Technical Field
The utility model relates to the technical field of household appliances, especially a camera module and heating device.
Background
Along with the progress of science and technology, the operation and management of the catering industry are influenced by the internet technology, the traditional catering industry starts to go on the way of automatic exploration, under the development trend, the intelligent steaming and baking oven takes place at the same time, the intelligent steaming and baking oven has obvious advantages compared with the traditional baking oven, particularly, in the aspect of functionality, the type and the state of food materials are automatically judged, the working mode of a machine is automatically judged, a corresponding cooking mode is made, time and labor are saved, energy is saved, and the automatic concept of the modern catering industry is perfectly conformed.
In order to automatically judge the type and state of food materials, a camera needs to be arranged to record food entering the steaming oven in the first step. In the prior art, a general high-temperature resistant camera covers a plurality of layers of heat-insulating light-transmitting layers on the outer side of a lens to play a role in heat insulation, and a heat dissipation fin is arranged at the tail part of the camera and used for heat dissipation.
However, in the high temperature resistant camera in the prior art, the heat dissipation fins usually perform contact type heat dissipation, and the high temperature resistant camera is usually small in size, so that the number of the heat dissipation fins in the high temperature resistant camera is small, the heat exchange coefficient is too small, and the heat dissipation effect is further reduced; and high temperature resistant camera sets up in the cooking device that the oil smoke is more, and radiating fin sets up in high temperature resistant camera densely, and the phenomenon of deposition, deposition oil smoke and dust appear easily, is unfavorable for the camera to carry out operations such as maintenance and washing.
SUMMERY OF THE UTILITY MODEL
To the above defect, the utility model aims to provide a camera module and heating device, this camera module can be used for high temperature environment, and simple structure, just dismantles and maintains with the installation.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a camera module, include:
a camera assembly;
the camera component is arranged in the camera fixing cavity; the front end part of the camera fixing cavity is provided with an air hole;
the active radiator is arranged at the rear end part of the camera fixing cavity and is provided with a first radiating channel, the air hole, the camera fixing cavity and the first radiating channel are communicated to form an airflow channel, and the camera assembly is positioned in the airflow channel;
the camera assembly shoots an external image through the first heat-insulation euphotic layer.
In the camera module, the air hole is located below the camera assembly and close to the first heat-insulation light-transmission layer.
In the camera module, the camera fixing cavity comprises a front cavity and a rear cavity which are connected, and the air hole is positioned in the front cavity;
the first heat-insulation light-transmitting layer is arranged at the front end of the front cavity, and the camera assembly is arranged in the front cavity;
the front end of the rear cavity is connected with the front cavity, and the active radiator is installed at the rear end of the rear cavity.
In the camera module, the first heat-insulating euphotic layer is provided with a first heat dissipation opening communicated with the camera fixing cavity.
In the camera module, the camera assembly comprises a lens, and an included angle between the extension direction of the central line of the lens and the plane of the first heat-insulation light-transmission layer is an acute angle beta.
In the camera module, the center line of the camera fixing cavity is superposed with the center line of the lens, and the center of the active radiator is located at the center line of the camera fixing cavity.
The utility model also provides a heating device, including the heating chamber, still include foretell camera module, camera module install in the outer chamber wall in heating chamber.
In the heating device, the heating chamber is provided with an observation hole, the observation hole is provided with a second heat-insulation euphotic layer, the first heat-insulation euphotic layer and the second heat-insulation euphotic layer are arranged oppositely, and a heat-insulation gap is arranged between the first heat-insulation euphotic layer and the second heat-insulation euphotic layer.
In the heating device, the front end of the camera fixing cavity is connected to the heating cavity, the camera fixing cavity is provided with a second heat dissipation opening, and the second heat dissipation opening is positioned between the first heat insulation light transmission layer and the second heat insulation light transmission layer;
the first heat dissipation opening, the heat insulation gap and the second heat dissipation opening form a second heat dissipation channel.
In the heating device, the first heat dissipation opening is located at the upper part of the first heat-insulation light-transmission layer, and the second heat dissipation opening is located at the lower part of the camera fixing cavity.
The utility model has the advantages that:
(1) the air hole, the camera fixing cavity and the first heat dissipation channel are communicated to form an air flow channel, the active heat radiator directly radiates heat from a high-temperature environment to the outside, and the heat dissipation effect is obvious; when the initiative radiator gives off heat to the outside, drive the air in the airflow channel, take away the dust and the oil smoke that get into the fixed cavity of camera, avoid filths such as dust and oil smoke to gather in the camera module, make the camera module can be arranged in the high temperature environment.
(2) Meanwhile, due to the good heat dissipation effect of the camera module, a plurality of heat-insulating and light-transmitting layers are not needed for heat insulation, so that the use of the heat-insulating and light-transmitting layers can be reduced; additionally, the camera module is with the thermal-insulated euphotic layer setting of second on heating the chamber, can further reduce the use of thermal-insulated euphotic layer on the camera module to reduce the total weight and the manufacturing cost of camera module.
(3) The camera fixing cavity is divided into a front cavity and a rear cavity, wherein the front cavity is used for fixing the camera assembly, and the rear cavity is connected with an active radiator; the front cavity and the rear cavity are connected in a plugging mode, so that the camera module is simple and compact in structure and convenient to mount, dismount and maintain.
Drawings
Fig. 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention.
Fig. 2 is an exploded view of a camera module according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a camera assembly according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of the connection between the front cavity and the heating cavity according to an embodiment of the present invention.
Wherein: the camera comprises a camera module A, a camera assembly 1, a lens 11, an image processing chip 12, a camera mounting plate 13, a camera fixing cavity 2, a front cavity 21, a through hole 211, an air hole 212, a groove 213, a cavity 22, a second heat dissipation port 23, an active heat radiator 3, a first heat insulation and light transmission layer 4, a first heat dissipation port 41, a first heat dissipation channel 5, a heating device B, a heating cavity B1, an observation hole B11, a second heat insulation and light transmission layer B12, a heat insulation gap B2, a central line X of the lens, a plane Y where the first heat insulation and light transmission layer is located, and a fixing surface Z of the camera module A.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The utility model provides a camera module, include:
a camera assembly 1;
the camera fixing cavity 2 is arranged, and the camera assembly 1 is arranged in the camera fixing cavity 2; the front end part of the camera fixing cavity 2 is provided with an air hole 212;
the active radiator 3 is arranged at the rear end part of the camera fixing cavity 2, the active radiator 3 is provided with a first radiating channel 5, the air hole 212, the camera fixing cavity 2 and the first radiating channel 5 are communicated to form an airflow channel, and the camera assembly 1 is positioned in the airflow channel;
the camera assembly comprises a first heat-insulation euphotic layer 4, wherein the first heat-insulation euphotic layer 4 is arranged at the front end of the camera fixing cavity 2, and the camera assembly 1 shoots and shoots external images through the first heat-insulation euphotic layer 4.
Specifically, referring to fig. 2, in an embodiment, the camera module a is applied inside a heating device capable of generating high temperature, such as an oven, a steam oven, and a microwave oven. Oven, steaming oven and microwave oven etc. can produce the heating device of high temperature and can produce higher heat, and the heat can transmit camera module A in, makes camera subassembly 1 temperature rise, leads to camera subassembly 1 can't bear the inside higher service environment temperature of heating device, and then leads to camera subassembly 1's image quality to descend or even damage.
The near end of one end of the camera fixing cavity 2, which is provided with the camera assembly 1, is provided with a through hole 211, and the through hole 211 provides a visual field required by shooting and recording for the lens 11.
The shape of the first insulating and light-transmitting layer 4 may be selected from various shapes, such as a circle or a rectangle, and in a specific embodiment, insulating and light-transmitting glass is used as the insulating and light-transmitting layer. And first thermal-insulated euphotic layer 4 is installed on preceding cavity 21 to cover through-hole 211, first thermal-insulated euphotic layer 4 are located the place ahead of camera lens 11 for it is thermal-insulated to transmit light, prevents that the heat from high temperature environment conduction from camera module A's inside, leads to camera module A's inside high temperature, reduces camera and camera mounting panel 13's life.
The camera module A forms an airflow channel through the air hole 212, the camera fixing cavity 2 and the first heat dissipation channel 5, the active heat radiator 3 directly radiates heat generated by the camera assembly 1 to the outside, and the heat dissipation effect is obvious; when the initiative radiator gives off heat to the outside, drive the air in the airflow channel, take away the dust and the oil smoke that get into the fixed cavity of camera, avoid filths such as dust and oil smoke to gather in camera module A, make camera module A can be arranged in the high temperature environment.
The heat dissipation form of the active heat sink 3 is various, and in a specific embodiment, the active heat sink 3 is a heat dissipation fan. The active radiator 3 is an exhaust type active radiator 3; the exhaust type active radiator 3 continuously discharges air with heat to the outside, negative pressure is formed inside the camera fixing cavity 2, and air with lower temperature enters the camera fixing cavity 2 from the air hole 212; the air with lower temperature meets the image processing chip 12 and exchanges heat with the air with heat near the camera assembly 1; the air with lower temperature becomes air with heat, and the density is reduced, therefore, the air with heat rises upwards and enters the first heat dissipation channel 5; the active heat sink 3 forms an airflow channel through the air hole 212, the camera fixing cavity 2 and the active heat sink 3, and discharges the air with heat in the first heat dissipation channel 5 to the outside, and the circulation is performed, so that the temperature inside the camera fixing cavity 2 is reduced.
Since the density of the air with heat is low, it is easy to accumulate in the first heat dissipation channel 5; the air with lower temperature has higher density and is easy to accumulate downwards, so the active radiator 3 with outward exhaust type is beneficial to the exchange of cold and hot air, thereby enhancing the heat radiation effect.
As a simple alternative, the air-breathing active heat sink 3 may be selected, when the air-breathing active heat sink 3 sucks air, air with a lower temperature is sucked into the first heat dissipation channel 5, so that the image processing chip 12 meets the air with a lower temperature, and the air with heat near the camera assembly 1 exchanges heat with the air with a lower temperature; because the active radiator 3 continuously inhales air, high pressure is formed inside the camera fixing cavity 2, air with heat is exhausted from the air hole 212, and the circulation is carried out, so that the heat from a high-temperature environment is radiated.
Preferably, the air hole 212 is located below the camera assembly 1 and near the first thermally insulated and optically transparent layer 4. The air hole 212 is provided on the ground-facing side of the front cavity 21. The area of front cavity bottom is bigger than the area of top surface, can set up a great amount of gas pockets, improves gas flow, increases the area of contact of cold air current and camera subassembly.
Specifically, the camera fixing cavity 2 includes a front cavity 21 and a rear cavity 22 connected to each other, and the air hole 212 is located in the front cavity 21;
the first heat-insulation and light-transmission layer 4 is arranged at the front end of the front cavity 21, and the camera assembly 1 is arranged in the front cavity 21;
the front end of the rear cavity 22 is connected with the front cavity 21, and the active radiator 3 is installed at the rear end of the rear cavity 22.
The camera fixing cavity 2 is divided into a front cavity 21 and a rear cavity 22, wherein the front cavity 21 is used for fixing the camera assembly 1, and the rear cavity 22 is connected with the active radiator 3; the front cavity 21 and the rear cavity 22 are connected in a plugging manner, so that the camera module is simple and compact in structure and convenient to mount, dismount and maintain.
The camera mounting plate 13 is directly mounted inside the front cavity 21, and the lens 11 is fixed on the camera mounting plate 13 in a screw locking manner, so that the lens 11 is aligned with the through hole 211; and an image processing chip 12 is arranged on the other side of the camera mounting plate 13.
The lens 11 captures images of the area in front of the through hole 211, the lens 11 transmits the captured images to the camera mounting plate 13 through electric signals, and the camera mounting plate 13 records and analyzes the images captured by the lens 11.
The active radiator 3 actively radiates heat from a high-temperature environment to the outside, air exchange is performed by matching with the air holes 212, and a cavity formed by the rear cavity 22 provides a space for exchanging cold and hot air, so that the radiating effect is remarkable, and the camera module A can be used in the high-temperature environment.
Specifically, referring to fig. 2 and fig. 4, the first heat-insulating and light-transmitting layer 4 is provided with a first heat sink 41 communicated with the camera fixing cavity 2. The front end of the camera fixing cavity 2 is provided with a groove 213 for the first heat-insulating and light-transmitting layer 4 to be embedded. In one embodiment, the first thermally and optically insulating layer 4 is rectangular, and the first thermally and optically insulating layer 4 fits into the groove 213, so that the groove 213 is also rectangular.
When the length (i.e., the width) of the first heat-insulating and light-transmitting layer 4 in the vertical direction is smaller than the length (i.e., the width) of the groove 213 in the vertical direction, the first heat-insulating and light-transmitting layer 4 cannot completely cover the groove 213, so that the through hole 211 cannot be completely sealed, and the first heat-insulating and light-transmitting layer 4 cannot completely cover the through hole 211, so that the uncovered portion of the through hole 211 becomes an open opening, thereby forming the first heat dissipation opening 41 for dissipating heat.
As a simple alternative, the shape of the first heat-insulating light-transmitting layer 4 is circular, and a first heat dissipation port 41 communicated with the camera fixing cavity 2 is formed in the surface of the first heat-insulating light-transmitting layer 4. The shape of the first thermally insulating and light-transmitting layer 4 and the groove 213 can be selected according to practical situations, and is not limited herein.
Referring to fig. 3 and 4, specifically, the camera assembly 1 includes a lens 11, and an included angle between an extending direction of a center line X of the lens 11 and a plane Y of the first thermally and optically insulating layer 4 is an acute angle β.
In order to meet the requirement of wider shooting angle, an included angle between the central line extending direction X of the lens 11 and the plane Y of the first heat-insulating and light-transmitting layer 4 is preferably an acute angle β. The plane of the first heat-insulating and light-transmitting layer 4 is parallel to the fixing plane Z of the camera module a, that is, the lens 11 is inclined relative to the fixing plane Z of the camera module a, and the acute angle β is an inclination angle of the lens 11 relative to the fixing plane Z of the camera module.
Specifically, the center line of the camera fixing cavity 2 coincides with the center line of the lens 11, and the center of the active heat sink 3 is located at the center line of the camera fixing cavity 2.
Under the condition that the position of the camera module is fixed and the observed object is the same, the position of the lens 11 inside the front camera fixing bracket 21 influences the shooting angle and range of the lens 11. When the axis of the front camera fixing bracket 21 coincides with the central line of the lens 11, the view of the lens 11 is widest and the dead angle is smallest.
The center of the active radiator 3 is located at the center line of the camera fixing cavity 2, that is, the active radiator 3 is arranged at the rear end part of the camera fixing cavity 2 in the middle, and when the active radiator 3 is a cooling fan, the air flowing effect is better, so that the cooling effect of the active radiator 3 is more remarkable.
Referring to fig. 1, 2 and 3, the present invention further provides a heating apparatus, including a heating chamber B1, and further including the camera module a, wherein the camera module a is installed on an outer chamber wall of the heating chamber B1.
The camera module A forms an airflow channel through the air hole 212, the camera fixing cavity 2 and the first heat dissipation channel 5, the active heat radiator 3 directly radiates heat from a high-temperature environment to the outside, and the heat dissipation effect is obvious; when initiative radiator distributes the heat to the outside, drive the air in the air current passageway, will get into the dust and the oil smoke of the fixed cavity of camera and take away, avoid filths such as dust and oil smoke to gather in camera module A, make camera module A is applicable to the high temperature environment, can the inside image of heating chamber of efficient shooting.
Due to the good heat dissipation effect of the camera module A, the heat insulation of the multi-layer heat insulation light transmission layer is not needed, and the use of the heat insulation light transmission layer can be reduced. In one embodiment, camera module a is mounted to three other outside chamber walls of heating chamber B1 in addition to the opening of heating chamber B1.
Furthermore, the heating chamber has been seted up and has been observed the hole, the thermal-insulated euphotic layer of second is installed to the observation hole, first thermal-insulated euphotic layer sets up with the thermal-insulated euphotic layer of second relatively, and has thermal-insulated clearance between the two.
The first heat-insulating transparent layer 4 and the second heat-insulating transparent layer B12 are arranged in an overlapping manner with a heat-insulating gap B2 therebetween. Because the coefficient of heat conductivity of air is extremely low, the heat that heating device produced is difficult to see through on thermal-insulated clearance B2 transmits the camera lens 11, avoids making camera module A's the problem that the temperature rises because of the heat increases for camera module A is applicable to in the high temperature environment.
The lens 11 can record the inside of the heating cavity B1 only by the heating cavity B1 requiring the observation hole B11. The shape and size of the second heat-insulating and light-transmitting layer B12 are matched with the shape and size of the observation hole B11.
The second heat-insulating light-transmitting layer B12 ensures that the lens 11 shoots and records the inside of the heating cavity B1, and simultaneously ensures the sealing property of the heating cavity B1, so that heat is prevented from being conducted to the outside of the heating cavity B1 from the inside of the heating cavity B1 through the observation hole B11; not only prevents the temperature of the camera module from rising due to the increase of heat and reduces the service life of the camera module, but also can reduce the heat consumption in the heating cavity B1 and save energy. In addition, the second heat-insulating and light-transmitting layer B12 can be arranged on the heating cavity B1, so that the use of the heat-insulating and light-transmitting layer on the camera module can be further reduced, and the total weight and the production cost of the camera module are reduced.
Preferably, one side of the second heat-insulating and light-transmitting layer B12 close to the interior of the heating cavity B1 is covered with a hydrophobic layer. When the heating cavity B1 is heated, water is heated and evaporated to form water vapor, and the water vapor is easily condensed into water drops; if water drops are condensed on the surface of the second heat-insulating and light-transmitting layer B12, the lens 11 is difficult to distinguish the inside of the heating cavity B1 through the refraction of the water drops, thereby interfering with the shooting process of the lens 11.
Therefore, the side of the second heat-insulating and light-transmitting layer B12 close to the inside of the heating chamber B1 needs to be coated with a hydrophobic layer (not shown in the figure) to avoid the phenomenon that water drops are condensed on the surface of the second heat-insulating and light-transmitting layer B12.
Furthermore, the front end of the camera fixing cavity 2 is connected to the heating cavity B1, the camera fixing cavity 2 has a second heat dissipation opening 23, and the second heat dissipation opening 23 is located between the first heat-insulating and light-transmitting layer 4 and the second heat-insulating and light-transmitting layer B12;
the first heat dissipation opening 41, the thermal insulation gap B2 and the second heat dissipation opening 23 form a second heat dissipation channel.
The first heat dissipation opening 41, the thermal insulation gap B2 and the second heat dissipation opening 23 form a second heat dissipation channel (not shown). When the active heat sink 3 is an exhaust type, air with a lower temperature enters the second heat dissipation channel from the second heat dissipation port 23, enters the front cavity 21 through the first heat dissipation port 41, and joins with the air with a lower temperature entering through the air hole 212.
When the active heat sink 3 is of an air suction type, air with heat enters the second heat dissipation channel from the first heat dissipation port 41 and is discharged to the outside through the second heat dissipation port 23, so that the air flow is increased, and the heat dissipation efficiency is increased.
Specifically, the first heat dissipation opening 41 is located at the upper portion of the first heat-insulating and light-transmitting layer, and the second heat dissipation opening 23 is located at the lower portion of the camera fixing cavity 2. When the first heat dissipation port 41 is located at the upper part of the first heat-insulating and light-transmitting layer and the second heat dissipation port 23 is located at the lower part of the camera fixing cavity 2, the air flow path is long, so that the cold and hot air can exchange heat sufficiently and take away the heat entering the camera module A.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. The utility model provides a camera module which characterized in that includes:
a camera assembly;
the camera component is arranged in the camera fixing cavity; the front end part of the camera fixing cavity is provided with an air hole;
the active radiator is arranged at the rear end part of the camera fixing cavity and is provided with a first radiating channel, the air hole, the camera fixing cavity and the first radiating channel are communicated to form an airflow channel, and the camera assembly is positioned in the airflow channel;
the camera component shoots an external image through the first heat-insulation euphotic layer.
2. The camera module of claim 1, wherein the air vent is located below the camera assembly and proximate to the first thermally and optically insulative layer.
3. The camera module according to claim 1, wherein the camera fixing cavity comprises a front cavity and a rear cavity which are connected, and the air hole is located in the front cavity;
the first heat-insulation light-transmitting layer is arranged at the front end of the front cavity, and the camera assembly is arranged in the front cavity;
the front end of the rear cavity is connected with the front cavity, and the active radiator is installed at the rear end of the rear cavity.
4. The camera module according to claim 1, wherein the first heat-insulating light-transmitting layer is provided with a first heat-dissipating opening communicated with the camera fixing cavity.
5. The camera module according to claim 1, wherein the camera assembly comprises a lens, and an included angle between the extending direction of the central line of the lens and the plane of the first thermal insulation and light transmission layer is an acute angle β.
6. The camera module according to claim 5, wherein a center line of the camera fixing cavity coincides with a center line of the lens, and a center of the active heat sink is located at the center line of the camera fixing cavity.
7. A heating apparatus comprising a heating chamber, and further comprising a camera module according to any one of claims 1 to 6, wherein the camera module is mounted to an outer chamber wall of the heating chamber.
8. The heating device as claimed in claim 7, wherein the heating cavity is provided with a viewing hole, the viewing hole is provided with a second thermal and light insulation layer, the first thermal and light insulation layer and the second thermal and light insulation layer are arranged oppositely, and a thermal insulation gap is arranged between the first thermal and light insulation layer and the second thermal and light insulation layer.
9. The heating device according to claim 8, wherein the front end of the camera fixing cavity is connected to the heating cavity, the camera fixing cavity has a second heat dissipation opening, and the second heat dissipation opening is located between the first heat-insulating light-transmitting layer and the second heat-insulating light-transmitting layer; the first heat-insulation light-transmitting layer is provided with a first heat dissipation port communicated with the camera fixing cavity;
the first heat dissipation opening, the heat insulation gap and the second heat dissipation opening form a second heat dissipation channel.
10. The heating device according to claim 9, wherein the first heat dissipation opening is located at an upper portion of the first heat-insulating light-transmitting layer, and the second heat dissipation opening is located at a lower portion of the camera fixing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020181005.XU CN211266961U (en) | 2020-02-18 | 2020-02-18 | Camera module and heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020181005.XU CN211266961U (en) | 2020-02-18 | 2020-02-18 | Camera module and heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211266961U true CN211266961U (en) | 2020-08-14 |
Family
ID=71955115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020181005.XU Active CN211266961U (en) | 2020-02-18 | 2020-02-18 | Camera module and heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211266961U (en) |
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2020
- 2020-02-18 CN CN202020181005.XU patent/CN211266961U/en active Active
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