CN217765347U - Calibration device - Google Patents
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- CN217765347U CN217765347U CN202221802683.9U CN202221802683U CN217765347U CN 217765347 U CN217765347 U CN 217765347U CN 202221802683 U CN202221802683 U CN 202221802683U CN 217765347 U CN217765347 U CN 217765347U
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Abstract
The application discloses calibrating device includes: a cavity; the product carrier is arranged in the cavity and used for bearing the pressure sensors; the temperature rising and lowering assembly is arranged below the product carrier and is in contact with the product carrier; the temperature raising and lowering assembly may include a plurality of heating assemblies for heating the plurality of pressure sensors, and a plurality of cooling assemblies for cooling the plurality of pressure sensors. The above-mentioned technical scheme that this application is disclosed through setting up a plurality of heating element and a plurality of refrigeration subassembly in product carrier below to go up and down the temperature operation with the help of heat-conducting mode to all pressure sensor that the product carrier bore, so that all pressure sensor's that the product carrier bore calibration temperature keeps basic unanimous, reduce the temperature difference when pressure sensor calibrates in batches, improve whole calibration accuracy, and reduce and go up and down warm time cycle, improve calibration efficiency.
Description
Technical Field
The present application relates to the field of sensor technology, and more particularly, to a calibration device.
Background
To ensure the reliability of the pressure sensor, the pressure sensor needs to be calibrated. When the pressure sensor is calibrated, the temperature of the pressure sensor needs to be increased or decreased so as to realize multi-temperature point calibration.
At present, during calibration, a plurality of pressure sensors are usually placed in a sealed cavity, and a high-low temperature impact machine and a flow passage connected with the high-low temperature impact machine and the sealed cavity are arranged outside. The high-low temperature impact machine blows air into the sealing cavity through the flow channel to raise and lower the temperature of the pressure sensor. However, the blown air has a certain energy loss and cannot ensure that the temperature of each pressure sensor is consistent, for example, taking the runner located in the middle area of the sealed cavity as an example, the temperature at the corner of the sealed cavity is lower than the temperature in the middle of the sealed cavity at high temperature, so that the temperature of the product at the corner is correspondingly lower than that of the product in the middle; at low temperatures, the product temperature at the corners is lower than the temperature in the middle due to the influence of the air flow, so that the overall calibration accuracy will deviate.
In summary, how to solve the temperature difference during the calibration of the batch pressure sensor is a technical problem to be urgently solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is an object of the present application to provide a calibration apparatus for resolving temperature differences during calibration of a batch of pressure sensors.
In order to achieve the above object, the present application provides the following technical solutions:
a calibration device, comprising:
a cavity;
a product carrier disposed within the cavity for carrying a plurality of pressure sensors;
a temperature raising and lowering assembly disposed below and in contact with the product carrier;
the temperature rise and fall subassembly includes a plurality of heating element that are used for being a plurality of pressure sensor heats, is used for a plurality of pressure sensor refrigerates a plurality of refrigeration subassemblies.
Preferably, the calibration device further comprises:
the upper template needle plate is arranged above the product carrier and is matched with the cavity; and an upper template needle which corresponds to the pressure sensor carried by the product carrier and is used for testing the pressure sensor is arranged on the upper template needle plate.
Preferably, the temperature raising and lowering assembly further comprises:
a first conductive block in contact with the product carrier for carrying the heating assembly;
the second conducting block is arranged below the first conducting block, is in contact with the first conducting block and is used for bearing the refrigeration assembly.
Preferably, a plurality of through holes are formed in the side surface of the first conducting block;
the heating assembly is provided with a heating rod, and the heating rod is arranged in the through hole.
Preferably, a plurality of through grooves are formed in the side surface of the second conduction block;
the refrigeration assembly is provided with refrigeration pieces, and the refrigeration pieces are arranged in the through grooves.
Preferably, the product carrier is a metal carrier, and the first conductive block and the second conductive block are metal conductive blocks.
Preferably, the first conductive block and the second conductive block are of a split structure.
Preferably, a plurality of groups of slots which are arranged in parallel and used for placing the pressure sensors are arranged on the product carrier.
Preferably, each group of the slots corresponds to one heating component and one refrigerating component.
Preferably, the calibration device further comprises a support frame located below the cavity.
The application provides a calibration device, includes: a cavity; the product carrier is arranged in the cavity and used for bearing the plurality of pressure sensors; the temperature rising and lowering assembly is arranged below the product carrier and is in contact with the product carrier; the temperature raising and lowering assembly may include a plurality of heating assemblies for heating the plurality of pressure sensors, and a plurality of cooling assemblies for cooling the plurality of pressure sensors.
The above-mentioned technical scheme that this application discloses, set up in the cavity and be used for bearing a plurality of pressure sensor's product carrier, the below setting of product carrier contacts and including the heating and cooling subassembly of a plurality of heating element and a plurality of refrigeration subassembly with the product carrier. The product carrier is heated by the plurality of heating assemblies at the same time, and at the moment, due to the existence of temperature difference, heat generated by heating is transmitted to the pressure sensors borne by the product carrier through the product carrier contacted by the temperature rise and fall assembly so as to heat the plurality of pressure sensors borne by the product carrier and raise the temperature of the pressure sensors; refrigerate simultaneously through a plurality of refrigeration subassemblies, at this moment, then can take place heat-conductively because the existence of temperature difference to cool down to a plurality of pressure sensor that the product carrier bore. This application also through set up a plurality of heating element and a plurality of refrigeration subassembly in product carrier below to with the help of heat-conduction's mode to all pressure sensor that the product carrier bore carry out the operation of rising and falling the temperature, so that all pressure sensor's that the product carrier bore calibration temperature keeps basic unanimous, reduces the temperature difference when pressure sensor calibrates in batches, improves whole calibration accuracy. In addition, the temperature rise and fall time period can be shortened through the mode, and the calibration efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an exploded view of a calibration device according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a product carrier and a corresponding temperature raising and lowering assembly according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of two product carriers and corresponding temperature raising and lowering assemblies according to an embodiment of the present disclosure;
FIG. 4 is an assembly diagram of an alignment device according to an embodiment of the present disclosure;
fig. 5 is a plan view of an upper template needle plate provided in an embodiment of the present application.
Detailed Description
The core of this application is to provide a calibrating device for solve the temperature difference when pressure sensor calibration in batches, improve holistic calibration accuracy.
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 3, in which fig. 1 illustrates an exploded view of a calibration device according to an embodiment of the present disclosure, fig. 2 illustrates a schematic view of a product carrier and a corresponding temperature raising and cooling assembly according to an embodiment of the present disclosure, and fig. 3 illustrates schematic views of two product carriers and corresponding temperature raising and cooling assemblies according to an embodiment of the present disclosure. The calibration device provided by the embodiment of the application can comprise:
a cavity 1;
a product carrier 2 arranged in the cavity 1 for carrying a plurality of pressure sensors 100;
a temperature raising and lowering assembly 3 disposed below the product carrier 2 and contacting the product carrier 2;
the temperature increasing and decreasing assembly 3 may include a plurality of heating assemblies 31 for heating the plurality of pressure sensors 100, and a plurality of cooling assemblies 32 for cooling the plurality of pressure sensors 100.
The calibration device that this application provided can include cavity 1, and this cavity 1 is used for placing product carrier 2 and goes up and down temperature subassembly 3 etc. can form the calibration chamber when calibrating pressure sensor 100 moreover to avoid ambient temperature etc. to cause the influence to pressure sensor 100's calibration.
The calibration device provided by the present application further includes a product carrier 2 disposed in the cavity 1, where the product carrier 2 is used for carrying a plurality of pressure sensors 100, so that the calibration device can simultaneously calibrate the plurality of pressure sensors 100. Wherein, in the calibration of the pressure sensors 100, a plurality of pressure sensors 100 may be regularly placed on the product carrier 2, for example: are placed in a plurality of rows side by side, each row containing a plurality of pressure sensors 100, so that the product carrier 2 carries as many pressure sensors 100 as possible and improves the ease of calibration of the pressure sensors 100. It should be noted that the product carrier 2 is specifically made of a material with good thermal conductivity, so as to better conduct heat.
In addition, the calibration device provided by the present application further includes a temperature raising and lowering assembly 3 disposed below the product carrier 2 and contacting the product carrier 2, wherein the temperature raising and lowering assembly 3 includes a plurality of heating assemblies 31 and a plurality of cooling assemblies 32 (the number of the heating assemblies 31 may be equal to or different from the number of the cooling assemblies 32). A plurality of heating assemblies 31 may be evenly distributed below the product carrier 2 and a plurality of cooling assemblies 32 may also be evenly distributed below the product carrier 2. When pressure sensor 100 is required to be heated up, then, a plurality of heating elements 31 contained in subassembly 3 that heats can be supplied with power simultaneously by using an external power supply, so that a plurality of heating elements 31 heat up simultaneously, at this moment, because of the existence of temperature difference, the heat of heating can be transmitted to all pressure sensors 100 borne by product carrier 2 through subassembly 3 that heats up and down and product carrier 2 that contacts with subassembly 3 that heats up and down (also heat conduction occurs), so as to heat pressure sensor 100, and thus pressure sensor 100 is heated up. When pressure sensor 100 needs to be cooled down, then can utilize external power supply (this external power supply can be the same with the external power supply that heating element 31 used, also can not be the same, specifically set up according to actual conditions) to supply power for a plurality of refrigeration subassemblies 32 that rise and fall temperature subassembly 3 and contain simultaneously, so that a plurality of refrigeration subassemblies 32 work simultaneously and refrigerate, at this moment, because there is the temperature difference between pressure sensor 100 that product carrier 2 bore and the refrigeration subassembly 32, consequently, heat conduction then can take place, in order to realize the refrigeration to pressure sensor 100, thereby make pressure sensor 100 cool down.
According to the process, the heating assembly 31 and the refrigerating assembly 32 are arranged below the product carrier 2, so that the temperature of all the pressure sensors 100 borne by the product carrier 2 can be increased or decreased in a heat conduction mode, the pressure sensors 100 can be calibrated simply and flexibly, the time period for increasing or decreasing the temperature can be shortened, and the calibration efficiency of the pressure sensors 100 can be improved conveniently. Moreover, since the plurality of heating assemblies 31 and the plurality of cooling assemblies 32 are provided in the present application, heat can be conducted to the pressure sensors 100 carried by the product carrier 2 as uniformly as possible, so that the calibration temperatures of all the pressure sensors 100 are substantially the same, thereby reducing the temperature difference during calibration of the plurality of pressure sensors 100 and improving the overall calibration accuracy.
It should be noted that, when the calibration device provided in the present application is used to calibrate the pressure sensor 100, the temperature control operation may be performed on the pressure sensor 100 according to the sequence of the first high temperature, the second normal temperature, and the last low temperature, or the first low temperature, the second normal temperature, and the last high temperature, so as to implement calibration at different temperature points. In addition, fig. 2 shows a schematic view of a pressure sensor 100 and a corresponding temperature raising and lowering assembly 3 carried by one product carrier 2, fig. 3 shows a schematic view of a pressure sensor 100 and a corresponding temperature raising and lowering assembly 3 carried by two product carriers 2 placed side by side, wherein the number of the product carriers 2 arranged in the calibration device can be specifically determined according to the size of the cavity 1 and the size of the product carriers 2, and fig. 1 illustrates an example of placing two product carriers 2 in the cavity 1, and does not limit the number of the product carriers 2 that can be placed in the cavity 1.
The above-mentioned technical scheme that this application discloses, set up in the cavity and be used for bearing a plurality of pressure sensor's product carrier, the below setting of product carrier contacts and including the heating and cooling subassembly of a plurality of heating element and a plurality of refrigeration subassembly with the product carrier. The product carrier is heated by the plurality of heating assemblies at the same time, and at the moment, due to the existence of temperature difference, heat generated by heating is transmitted to the pressure sensors borne by the product carrier through the product carrier contacted by the temperature rise and fall assembly so as to heat the plurality of pressure sensors borne by the product carrier and raise the temperature of the pressure sensors; refrigerate through a plurality of refrigeration subassemblies simultaneously, at this moment, then can take place heat-conductively because the existence of temperature difference to a plurality of pressure sensor that bear the weight of the product carrier cool down. This application also through set up a plurality of heating element and a plurality of refrigeration subassembly in product carrier below to with the help of heat-conduction's mode to all pressure sensor that the product carrier bore carry out the operation of rising and falling the temperature, so that all pressure sensor's that the product carrier bore calibration temperature keeps basic unanimous, reduces the temperature difference when pressure sensor calibrates in batches, improves whole calibration accuracy. In addition, the temperature rise and fall time period can be shortened through the mode, and the calibration efficiency is improved.
In an embodiment of the present application, a calibration apparatus may further include:
an upper template needle plate 4 which is arranged above the product carrier 2 and is matched with the cavity 1; the upper template needle plate 4 is provided with an upper template needle 5 which corresponds to the pressure sensor 100 carried by the product carrier 2 and is used for testing the pressure sensor 100.
The calibration device provided by the application can also comprise an upper template needle plate 4 which is arranged above the product carrier 2 and is matched with the cavity 1, wherein the matching mentioned here means that the size of the upper template needle plate 4 is almost the same as that of the cavity 1, so that the upper template needle plate 4 and the cavity 1 can form a calibration cavity. Referring specifically to fig. 4, there is shown an assembly schematic diagram of the calibration apparatus provided in the embodiment of the present application, in which the upper template pin plate 4 and the cavity 1 form a calibration cavity, and the product carrier 2 and the pressure sensor 100 and the temperature raising and lowering assembly 3 carried by the product carrier are located in the calibration cavity.
The upper platen pins 5 corresponding to the pressure sensors 100 carried by the product carrier 2 are provided on the upper platen pin plate 4. Reference is made in particular to fig. 5, which shows a top view of the upper template needle board provided by the embodiments of the present application. When the upper die plate 4 and the cavity 1 form a calibration cavity, the upper die plate pins 5 provided on the upper die plate 4 can be inserted into the pins of the pressure sensor 100 to be connected to the pressure sensor 100, thereby testing the pressure sensor 100.
The calibration device that this application embodiment provided, temperature rising and dropping subassembly 3 can also include:
a first conductive block 33 in contact with the product carrier 2 for carrying the heating assembly 31;
is disposed below the first conductive block 33 and contacts the first conductive block 33 for carrying the second conductive block 34 of the refrigeration assembly 32.
In the calibration device provided herein, the temperature raising/lowering assembly 3 may further include a first conductive block 33 located below the product carrier 2 and contacting the product carrier 2, the first conductive block 33 being used for carrying each heating assembly 31. In addition, the temperature raising and reducing assembly 3 may further include a second conductive block 34 located below the first conductive block 33 and contacting the first conductive block 33, wherein the second conductive block 34 is used for carrying and integrating the cooling assemblies 32.
When the heating assembly 31 is heating, the pressure sensor 100 can be heated by heat conduction through the first conductive block 33 and the product carrier 2, so that the temperature of the pressure sensor 100 is raised. When the cooling assembly 32 cools, the pressure sensor 100 can be cooled by heat conduction through the second conductive block 34, the first conductive block 33 and the product carrier 2, so that the temperature of the pressure sensor 100 is reduced.
Setting through first conduction block 33 can play the effect of holding heating element 31, setting through second conduction block 34 can play the effect of holding refrigeration subassembly 32, so that the relevant subassembly that heaies up to pressure sensor 100 can the modularization, and make the relevant subassembly that cools down to pressure sensor 100 can the modularization, thereby be convenient for carry out setting, installation, change and maintenance etc. of pressure sensor 100 calibrating device better, and play the effect of rising and falling the temperature to pressure sensor 100 better.
In the calibration apparatus provided in the embodiment of the present application, a plurality of through holes are disposed on a side surface of the first conductive block 33;
the heating assembly 31 is a heating rod, and the heating rod is arranged in the through hole.
In the present application, a plurality of through holes may be specifically formed on a side surface of the first conductive block 33, wherein the side surface of the first conductive block 33 mentioned herein is a surface of the first conductive block 33 that is not in contact with the product carrier 2 and the second conductive block 34, and the number of the through holes formed on the side surface of the first conductive block 33 may be equal to the number of the heating assemblies 31.
On the basis, the heating assembly 31 included in the temperature raising and reducing assembly 3 may specifically be heating rods, the heating rods may be disposed in through holes disposed on the side surface of the first conductive block 33, and one heating rod is disposed in one through hole, wherein the length of the heating rod is not shorter than that of the through hole, so that the plurality of heating rods can heat better and more uniformly.
By the above method, the temperature rising and lowering assembly 3 can achieve a better temperature rising effect on the pressure sensor 100, and the temperature rising cost during calibration of the pressure sensor 100 can be reduced.
In the calibration device provided in the embodiment of the present application, a plurality of through slots are disposed on the side surface of the second conductive block 34;
the refrigeration assembly 32 is a refrigeration piece disposed in the through slot.
In this application, a side surface of second conducting block 34 may be provided with a plurality of through grooves, where the side surface of second conducting block 34 mentioned herein is a surface parallel to the side surface of first conducting block 33 in second conducting block 34, and the side surface provided with the through grooves may specifically be located in the same plane as the side surface provided with the through holes in second conducting block 34, and of course, may also be located in different planes, which is not limited in this application. It should be noted that the number of the through slots provided on the side surface of the second conduction block 34 may be equal to the number of the refrigeration assemblies 32.
In addition, the refrigeration subassembly 32 that this application provided specifically can be the refrigeration piece, and these refrigeration pieces can set up in the logical inslot that second conduction piece 34 side set up, and a logical inslot is provided with a refrigeration piece, and wherein, the length of refrigeration piece can be not less than the length that leads to the groove to make a plurality of refrigeration pieces can refrigerate better, more evenly.
By means of the mode, the temperature rising and reducing assembly 3 can achieve a better refrigerating effect on the pressure sensor 100.
In an embodiment of the present disclosure, the product carrier 2 is a metal carrier, and the first conductive block 33 and the second conductive block 34 are metal conductive blocks.
In the present application, the product carrier 2 may be a metal carrier, and both the first conductive block 33 and the second conductive block 34 may be metal conductive blocks. Since the heat conduction effect of the metal material is good, the heat conduction effect can be improved by using the metal material to prepare the product carrier 2, the first conductive block 33 and the second conductive block 34, so that the temperature rising and falling effect of the pressure sensor 100 is improved.
The metal materials used for the product carrier 2, the first conductive block 33 and the second conductive block 34 may be the same, so as to reduce the complexity of manufacturing the product carrier 2, the first conductive block 33 and the second conductive block 34. Of course, the metal materials used for the product carrier 2, the first conductive block 33, and the second conductive block 34 may be different, and the application is not limited thereto.
In the calibration apparatus provided in the embodiment of the present application, the first conductive block 33 and the second conductive block 34 are split structures.
In the present application, the first conductive block 33 and the second conductive block 34 may have a distributed structure, that is, the first conductive block 33 and the second conductive block 34 are two independent conductive blocks, so that the corresponding detachment and replacement are facilitated, and the manufacturing cost is reduced.
Of course, the first and second conductive blocks 33 and 34 may be a unitary structure.
In the calibration apparatus provided in the embodiment of the present application, a plurality of sets of slots for placing the pressure sensors 100 are arranged in parallel on the product carrier 2.
In this application, can be provided with the trench that the multiunit was arranged side by side on the product carrier 2, and every group trench all includes the multiunit trench, and every trench all is used for placing pressure sensor 100.
The pressure sensor 100 can be positioned by performing the slot position setting, so as to facilitate the placement of the pressure sensor 100.
According to the calibrating device provided by the embodiment of the application, each group of slots corresponds to one heating component 31 and one refrigerating component 32.
In this application, every group trench that sets up on product carrier 2 can all correspond a heating element 31 and a refrigeration subassembly 32, and the heating element 31 and the refrigeration subassembly 32 that correspond can set up under corresponding group trench to in the temperature rise or fall to pressure sensor 100 better, and reduce the temperature difference when proofreading better.
According to the calibration device provided by the embodiment of the application, the calibration device further comprises a support frame 6 located below the cavity 1.
The calibration device that this application provided can also be including being located cavity 1 below support frame 6 to utilize support frame 6 to play the supporting role to cavity 1, go up and down temperature subassembly 3, product carrier 2 etc..
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the technical solutions provided in the embodiments of the present application that are consistent with implementation principles of corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A calibration device, comprising:
a cavity;
a product carrier disposed within the cavity for carrying a plurality of pressure sensors;
a temperature raising and lowering assembly disposed below and in contact with the product carrier;
the temperature rising and lowering assembly comprises a plurality of heating assemblies for heating the pressure sensors and a plurality of refrigerating assemblies for refrigerating the pressure sensors.
2. The calibration device of claim 1, further comprising:
the upper template needle plate is arranged above the product carrier and is matched with the cavity; and an upper template needle which corresponds to the pressure sensor carried by the product carrier and is used for testing the pressure sensor is arranged on the upper template needle plate.
3. The calibration device of claim 1, wherein the temperature ramping assembly further comprises:
a first conductive block in contact with the product carrier for carrying the heating assembly;
the second conducting block is arranged below the first conducting block, is in contact with the first conducting block and is used for bearing the refrigeration assembly.
4. The calibration device of claim 3, wherein the first conductive block is provided with a plurality of through holes at a side thereof;
the heating assembly is provided with a heating rod, and the heating rod is arranged in the through hole.
5. A calibration device according to claim 3 wherein the second conductive block is provided with a plurality of through slots on a side thereof;
the refrigeration piece of the refrigeration component is arranged in the through groove.
6. The calibration device of claim 3, wherein the product carrier is a metal carrier and the first and second conductive bumps are metal conductive bumps.
7. The calibration device of claim 3, wherein the first conductive block and the second conductive block are a split structure.
8. The calibration device according to any one of claims 1 to 7, wherein a plurality of sets of slots are provided in the product carrier in parallel for receiving the pressure sensors.
9. The calibration device of claim 8 wherein each set of slots corresponds to one of the heating assembly and the cooling assembly.
10. The calibration device of claim 8, further comprising a support stand positioned below the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221802683.9U CN217765347U (en) | 2022-07-13 | 2022-07-13 | Calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221802683.9U CN217765347U (en) | 2022-07-13 | 2022-07-13 | Calibration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217765347U true CN217765347U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221802683.9U Active CN217765347U (en) | 2022-07-13 | 2022-07-13 | Calibration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217765347U (en) |
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2022
- 2022-07-13 CN CN202221802683.9U patent/CN217765347U/en active Active
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