CN216650040U - Electromagnetic heating device - Google Patents
Electromagnetic heating device Download PDFInfo
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- CN216650040U CN216650040U CN202122558526.XU CN202122558526U CN216650040U CN 216650040 U CN216650040 U CN 216650040U CN 202122558526 U CN202122558526 U CN 202122558526U CN 216650040 U CN216650040 U CN 216650040U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The utility model relates to an electromagnetic heating device, which comprises a heating coil, a heating control circuit assembly, a heat dissipation assembly and an insulation assembly, wherein the heating control circuit assembly is electrically connected with the heating coil; the insulation assembly includes a circuit insulator and a coil insulator, which are respectively disposed outside the electronic component and the heating coil and are respectively in heat-transferring contact with outer surfaces of the electronic component and the heating coil. The utility model can insulate and seal the electronic element, improve the waterproof performance and simultaneously not influence the heat dissipation performance of the electronic element, effectively ensure the long-term stability of the insulation seal and prolong the service life of the device.
Description
Technical Field
The utility model relates to the technical field of electromagnetic heating, in particular to an electromagnetic heating device.
Background
Electromagnetic heating (IH), also known as electromagnetic Induction heating, is based on the principle of passing an alternating current through an electronic circuit board or coil to generate an alternating magnetic field, arranging a metal heating rod in the alternating magnetic field, wherein the metal heating rod generates an eddy current in the alternating magnetic field, the eddy current makes carriers inside the heating rod move randomly at a high speed, and the carriers collide and rub with atoms to generate Heat energy, thereby heating an article or fluid to be heated.
Most of the existing electromagnetic heating devices are not applied to wading environments, and do not need to be insulated and sealed, so that excessive heat generated by electronic elements of exposed electronic circuit boards, heating coils and other heating control circuits in the working process can be directly exchanged with air to achieve the purpose of heat dissipation and cooling, and for enhancing the heat dissipation rate, fans are further arranged in partial products, the air flow rate on the surfaces of heat-producing components is accelerated to achieve rapid cooling, and the problem that the interior of the products is overheated, so that the working performance is influenced, and even the safety risk is caused is avoided.
For products needing to be used in an wading environment or products needing to be used for heating a liquid medium, in order to avoid the problem that in the use process, external moisture or the liquid medium enters the electromagnetic heating device and then contacts with wading parts such as an electronic circuit board, a heating coil or electronic elements of other heating control circuits and the like to cause electric shock hazard, the electromagnetic heating device is usually insulated and sealed by adopting insulation sealing, the electronic elements of the electronic circuit board, the heating coil or the electronic elements of other heating control circuits and the like cannot be directly cooled after the insulation sealing, and the electronic elements are easily burnt out or the insulation sealing is damaged and failed due to overheating after the electromagnetic heating device runs for a period of time, so that the problem of the electric shock hazard is caused.
SUMMERY OF THE UTILITY MODEL
Accordingly, an object of the present invention is to provide an electromagnetic heating device having advantages of simple structure, high water resistance, and excellent sealing and insulating properties and heat dissipation effects.
An electromagnetic heating device comprises a heating coil, a heating control circuit assembly, a heat dissipation assembly and an insulation assembly;
the heating control circuit assembly is electrically connected with the heating coil and controls the heating coil to be closed and opened; the heating control circuit assembly comprises a loop box and a plurality of electronic elements arranged in the loop box;
the heat dissipation assembly comprises a heat transfer unit and a medium heat dissipation unit, and the heat transfer unit is detachably fixed with the electronic element and is in heat transfer contact with the electronic element; a heat dissipation medium flows in the medium heat dissipation unit and is in heat transfer contact with the surface of the heat transfer unit;
the insulation assembly comprises a circuit insulation piece and a coil insulation piece, wherein the circuit insulation piece and the coil insulation piece are respectively arranged outside the electronic element and the heating coil and are respectively in heat transfer contact with the electronic element and the outer surface of the heating coil.
According to the electromagnetic heating device provided by the embodiment of the utility model, the circuit insulating piece and the coil insulating piece are respectively arranged outside the electronic element and the heating coil to carry out insulating sealing on the electronic element and the heating coil, so that water resistance is realized, and the problem that external moisture or a liquid medium to be heated enters an electric-shock area to cause electric shock danger when the electromagnetic heating device is used is avoided; in addition, by arranging the heat transfer unit and the medium heat dissipation unit, the heat transfer unit is detachably fixed and in heat transfer contact with the electronic element to transfer heat generated by the electronic element during operation, and further the heat is taken away from the heat transfer unit by combining the flow of the heat transfer medium in the medium heat dissipation unit, so that the purpose of heat dissipation is achieved, the electronic element can be subjected to insulation sealing, the waterproof performance is improved, the heat dissipation performance is not influenced, the long-term stability of the insulation sealing is effectively ensured, and the service life of the device is prolonged.
Furthermore, the medium heat dissipation unit is of a liquid cooling structure and comprises a liquid storage tank, a cooling pipeline and a power device; the liquid storage tank is internally stored with a liquid medium, one end of the cooling pipeline is communicated with the liquid storage tank, and the power device is communicated with the cooling pipeline and drives the liquid medium to flow in the cooling pipeline; the pipe wall of the cooling pipe is in heat transfer contact with the surface of the heat transfer unit, heat generated by the electronic element is transferred through the heat transfer unit and the pipe wall of the cooling pipe in sequence, and the liquid medium flowing in the cooling pipe is further utilized to take away the heat, so that the purpose of heat dissipation is achieved.
Furthermore, the cooling pipeline penetrates through the loop box, and the heat transfer unit is sleeved outside the cooling pipeline and located in the loop box. The heat transfer unit is sleeved outside the cooling pipeline, so that the heat transfer contact area can be increased, and the heat transfer efficiency is improved.
Furthermore, the electronic component comprises an IGBT and a rectifier bridge, and the IGBT and the rectifier bridge are detachably fixed with the heat transfer unit through fixing screws. Utilize the fixed screw to realize detachable fixed, fixed stability is good, and dismouting convenient operation.
Furthermore, the heat transfer unit is a radiator with a multi-fin structure, the material of the radiator is selected from one or more of aluminum, aluminum alloy, ceramic and quartz, the multi-fin structure can enlarge the heat transfer area, and the material with higher heat transfer coefficient is preferably used, so that the heat transfer rate is improved, and the heat dissipation is enhanced; the material of the cooling pipeline is selected from one or more of plastic, metal and quartz, and the insulation and heat transfer can be realized simultaneously.
Further, the medium heat dissipation unit is an air cooling structure and comprises a heat dissipation fan; the heat transfer unit comprises a fixed end and a heat dissipation end which are fixedly connected, and the fixed end is arranged in the loop box and detachably fixed with the electronic element; the heat dissipation end penetrates and extends to the outside of the loop box, and the heat dissipation fan faces the heat dissipation end. By means of the arrangement of the heat transfer unit, heat generated by the electronic element during working can be transferred out of the loop box, and further taken away by flowing air generated by the cooling fan during working, so that effective cooling is achieved, and electric shock hazard is avoided.
Furthermore, electronic component includes IGBT and rectifier bridge, IGBT with the rectifier bridge be through the fixation clamp with the stiff end detachable fixed of heat transfer unit, fixed stability is good and dismouting easy and simple to handle.
Furthermore, the circuit insulating part is a two-liquid type polyurethane resin and is filled in the loop box, and the whole filling arrangement can effectively realize heat transfer contact between the cooling pipeline and the heat transfer unit and realize insulation; coil insulation spare is two liquid type polyurethane resin, its parcel set up in outside the heating coil, when carrying out insulation sealing, can also absorb produced heat of heating coil during operation reaches the effect of cooling to a certain extent, with the extension the operating time of heating coil.
Furthermore, the insulating assembly further comprises a ceramic insulating sheet, and the ceramic insulating sheet is arranged between the electronic element and the heat transfer unit so as to realize insulation between the electronic element and the heat transfer unit and not influence the heat transfer effect of the electronic element and the heat transfer unit.
Further, the ceramic insulating sheet with electronic component the ceramic insulating sheet with still be provided with the polyimide insulating cement between the heat transfer unit, the polyimide insulating cement with the ceramic insulating sheet electronic component still coat between the heat transfer unit and have heat conduction silicone grease to further improve insulating effect.
For a better understanding and practice, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of an electromagnetic heating apparatus according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a partial structure of an electromagnetic heating apparatus according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of the heat transfer unit and the cooling pipe according to embodiment 1 of the present invention;
fig. 4 is a schematic partial structure diagram of a first electromagnetic heating device according to embodiment 2 of the present invention;
fig. 5 is a schematic view of a partial structure of an electromagnetic heating apparatus according to embodiment 2 of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1
Referring to fig. 1-2, fig. 1 is a schematic diagram illustrating an electromagnetic heating device according to embodiment 1 of the present invention, and fig. 2 is a schematic diagram illustrating a partial structure of the electromagnetic heating device according to embodiment 1 of the present invention, as shown in the drawings, embodiment 1 of the present invention provides an electromagnetic heating device, which can be applied to a warm water tooth rinsing device, i.e., a hot water faucet, etc., for heating liquid or heating other media, and includes a heating coil 1, a heating control circuit assembly 2, a heat dissipation assembly 3, and an insulation assembly 4;
the heating control circuit assembly 2 is electrically connected with the heating coil 1 and controls the closing and opening of a loop of the heating coil 1; the heating control circuit assembly 2 comprises a loop box 21 and a plurality of electronic elements arranged in the loop box 21;
the heat dissipation assembly 3 comprises a heat transfer unit 31 and a medium heat dissipation unit, wherein the heat transfer unit 31 is detachably fixed with the electronic element and is in heat transfer contact with the electronic element; a heat dissipation medium flows in the medium heat dissipation unit and is in heat transfer contact with the surface of the heat transfer unit 31;
the insulating assembly 4 includes a circuit insulator 41 and a coil insulator 42, and the circuit insulator 41 and the coil insulator 42 are respectively disposed outside the electronic component and the heating coil 1 and are respectively in heat-transferring contact with outer surfaces of the electronic component and the heating coil 1.
In the electromagnetic heating device according to embodiment 1 of the present invention, the circuit insulating member 41 and the coil insulating member 42 are respectively disposed outside the electronic component and the heating coil 1 to perform insulating sealing on the electronic component and the heating coil 1, so as to avoid the problem of electric shock hazard caused by external moisture or a liquid medium to be heated entering an electric-shock region during use; in addition, by arranging the heat transfer unit 31 and the medium heat dissipation unit, the heat transfer unit 31 is detachably fixed and in heat transfer contact with the electronic element to transfer heat generated by the electronic element during operation, and further, the heat is taken away from the heat transfer unit 31 by combining the flow of the heat transfer medium in the medium heat dissipation unit, so that the purpose of heat dissipation is achieved, the electronic element can be subjected to insulation sealing, the waterproof performance is improved, the heat dissipation performance is not influenced, the long-term stability of the insulation sealing is effectively ensured, and the service life of the device is prolonged.
Specifically, the heating coil 1 is used for heating a medium to be heated, for heating water flowing through a pipeline when the heating coil is applied to a warm water tooth flusher or an instant heating faucet, the heating coil 1 is of a multi-layer coil structure formed by winding multiple strands of stranded wires, each strand of stranded wire is an enameled wire, functional insulation is formed between the wires, and the service voltage of the heating coil 1 in normal operation is high voltage (above dangerous voltage 42V), so that the heating coil needs to be sealed and insulated when applied to an IPX7 waterproof type ii appliance, and meanwhile, the heating value of the heating coil 1 in normal operation is large, so that the heating coil needs to be radiated, and damage to an insulating material coated by the stranded wires is avoided, and further electric shock danger is caused.
As an optional implementation manner, in the present embodiment, the medium heat dissipation unit is a liquid cooling structure, and includes a liquid storage tank 32, a cooling pipeline 33, and a power device, the liquid storage tank 32 stores a liquid medium, one end of the cooling pipeline 33 is communicated with the liquid storage tank 32, and the power device is communicated with the cooling pipeline 33 and drives the liquid medium to flow in the cooling pipeline 33; specifically, in the present embodiment, the power device includes a liquid pump 34 and a motor 35 in driving connection with the liquid pump 34, and an inlet and an outlet of the liquid pump 34 are both communicated with the cooling pipeline 33; the outer side surface of the cooling pipeline 33 is in heat transfer contact with the surface of the heat transfer unit 31, heat generated by the electronic element is further transferred through the heat transfer unit 31 and the side wall of the cooling pipeline 33, and the liquid medium flowing in the cooling pipeline 33 is used for carrying away the heat, so that the purpose of heat dissipation is achieved. When the electromagnetic heating device is applied to a product for heating liquid instantly, such as a warm water tooth-rinsing device or an instant water faucet, the liquid medium can be water, and the liquid storage tank 32 and the cooling pipeline 33 can be further overlapped with a heating water loop of the warm water tooth-rinsing device or the instant water faucet, as shown by the arrow direction in fig. 1, the design can also fully utilize the heat absorbed by the water when the water is used as the liquid medium for heat dissipation, so as to achieve the purpose of saving energy.
As an optional implementation manner, please refer to fig. 3, fig. 3 is a schematic structural view of the heat transfer unit and the cooling pipeline in embodiment 1 of the present invention, as shown in the drawing, in this embodiment, the cooling pipeline 33 is disposed through the loop box 21, and the heat transfer unit 31 is sleeved outside the cooling pipeline 33 and located inside the loop box 21; the cooling water flows through the cooling pipe in the direction of the arrow shown in fig. 3, and the heat transfer unit 31 is disposed outside the cooling pipe 33, so as to increase the heat transfer contact area and improve the heat transfer efficiency.
The heat transfer unit 31 is a heat sink with a multi-fin structure, the heat sink is made of one or more of aluminum, aluminum alloy, ceramic and quartz, the multi-fin structure can enlarge the heat transfer area, and preferably uses a material with a higher heat transfer coefficient, which is beneficial to improving the heat transfer rate and enhancing the heat dissipation; the material of the cooling pipeline 33 is selected from one or more of plastic, metal and quartz, so that insulation and heat transfer can be realized simultaneously, the cooling pipeline 33 can be a straight-through pipe, a bent pipe or an irregular-shaped pipe, and the shape and the size of the cooling pipeline depend on the heat productivity of the heating element IGBT 10 and the rectifier bridge 11 at the maximum power.
As an alternative embodiment, the circuit insulator 41 is a two-component polyurethane resin, and is filled and disposed in the loop box 21, and the overall filling arrangement can effectively realize the heat transfer contact between the cooling pipe 33 and the heat transfer unit 31, and simultaneously realize insulation; furthermore, the loop box 21 should be made of a material with a fire rating of V0 or above, the polyurethane resin is poured into the loop box 21 when not solidified, and the distance between the liquid level of the polyurethane resin and the electronic component with the highest level should be 2mm or above, so as to ensure that all the electronic components are wrapped by the polyurethane resin and ensure the insulation effect, and the minimum distance between the heat transfer unit 31 and the outer surface of the pipe wall of the cooling pipe 33 should be 2.0mm or above, so as to facilitate the filling and insulation of the polyurethane resin. The insulation structure is filled in the loop box 21 after the resin is condensed, preferably, the loop box 21 can be also selected as a transparent part to be beneficial to checking whether bubbles remain after the polyurethane resin is filled to cause insufficient insulation distance, the coil insulation part 42 is made of two-liquid polyurethane resin and is wrapped outside the heating coil 1, and when insulation sealing is carried out, heat generated when the heating coil 1 works can be absorbed, so that the cooling effect is achieved to a certain extent, and the working time of the heating coil 1 is prolonged.
Specifically, referring to fig. 2-3, as shown in the drawings, in the present embodiment, the electronic component includes an IGBT 22 and a rectifier bridge 23, and since the heat transfer unit and the electronic component are integrally embedded in the liquid polyurethane resin in the present embodiment, insulation can be effectively achieved, the IGBT 22 and the rectifier bridge 23 can be detachably fixed to the heat transfer unit 31 by fixing screws (not shown). Utilize the fixed screw to realize detachable fixed, fixed stability is good, and dismouting convenient operation.
Further preferably, the insulation assembly 4 further comprises a ceramic insulation sheet (not shown) disposed between the electronic component and the heat transfer unit 31 to realize insulation between the electronic component and the heat transfer unit 31 without affecting the heat transfer effect thereof, and preferably, the thickness of the ceramic insulation sheet should be not less than 0.6mm to ensure the insulation effect.
Example 2
Referring to fig. 4-5, fig. 4 is a schematic view of a partial structure of an electromagnetic heating device according to embodiment 2 of the present invention, and fig. 5 is a schematic view of a partial structure of an electromagnetic heating device according to embodiment 2 of the present invention, where as shown in the drawings, embodiment 2 of the present invention provides an electromagnetic heating device, which is different from embodiment 1 in that: the medium heat radiation unit is an air cooling structure and comprises a heat radiation fan 36; the heat transfer unit 31 includes a fixed end 311 and a heat dissipation end 312, which are fixedly connected, the fixed end 311 is disposed in the loop box 21 and detachably fixed with the electronic component; the heat dissipating end 312 extends through the circuit box 21, and the heat dissipating fan 36 is disposed toward the heat dissipating end 312. By the arrangement of the heat transfer unit 31, heat generated by the electronic component during operation can be transferred from the loop box 21, and further taken away by the flowing air generated by the heat dissipation fan 36 during operation, so that effective heat dissipation is realized, and electric shock hazard is not caused.
Specifically, the electronic component includes an IGBT 22 and a rectifier bridge 23, in order to realize insulation between the electronic component and the heat transfer unit 31, the IGBT 22 and the rectifier bridge 23 are detachably fixed to a fixing end 311 of the heat transfer unit 31 through a fixing clip 5, the fixing stability is good, the dismounting and mounting operations are simple and convenient, the fixing clip 5 is an insulating material, the fire protection rating of the fixing clip is above V0, and the fixing clip is used for clamping and fixing relative to a fixing screw made of a conductive material, so that effective insulation can be realized.
Further, in this embodiment, since the heat dissipating end 312 of the heat transferring unit 31 penetrates through the loop box 21, in order to enhance the insulation, and to meet the requirement of dual insulation in the waterproof type ii apparatus, a polyimide insulating glue 44 is further disposed between the ceramic insulating sheet 43 and the electronic component, between the ceramic insulating sheet 43 and the heat transferring unit 31, so as to further improve the insulation effect, and further, a heat conductive silicone grease (not shown) is further coated between the polyimide insulating glue 44 and the ceramic insulating sheet 43, between the electronic component and the heat transferring unit 31, so that the heat transferring effect is better and more uniform.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model.
Claims (10)
1. An electromagnetic heating device, characterized by: comprises a heating coil, a heating control circuit component, a heat dissipation component and an insulation component;
the heating control circuit assembly is electrically connected with the heating coil and controls the on and off of a heating coil loop; the heating control circuit component comprises a loop box and a plurality of electronic elements arranged in the loop box;
the heat dissipation assembly comprises a heat transfer unit and a medium heat dissipation unit, and the heat transfer unit is detachably fixed with the electronic element and is in heat transfer contact with the electronic element; a heat dissipation medium flows in the medium heat dissipation unit and is in heat transfer contact with the surface of the heat transfer unit;
the insulation assembly comprises a circuit insulation piece and a coil insulation piece, wherein the circuit insulation piece and the coil insulation piece are respectively arranged outside the electronic element and the heating coil and are respectively in heat transfer contact with the electronic element and the outer surface of the heating coil.
2. An electromagnetic heating apparatus according to claim 1, characterized in that: the medium heat dissipation unit is of a liquid cooling structure and comprises a liquid storage tank, a cooling pipeline and a power device; the liquid storage tank is internally stored with a liquid medium, one end of the cooling pipeline is communicated with the liquid storage tank, and the power device is communicated with the cooling pipeline and drives the liquid medium to flow in the cooling pipeline; the pipe wall of the cooling pipe is in heat transfer contact with the surface of the heat transfer unit.
3. An electromagnetic heating apparatus according to claim 2, characterized in that: the cooling pipeline penetrates through the loop box, and the heat transfer unit is sleeved outside the cooling pipeline and located in the loop box.
4. An electromagnetic heating apparatus according to claim 3, characterized in that: the electronic element comprises an IGBT and a rectifier bridge, and the IGBT and the rectifier bridge are detachably fixed with the heat transfer unit through fixing screws.
5. An electromagnetic heating apparatus according to claim 4, characterized in that: the heat transfer unit is a radiator with a multi-fin structure, and the material of the radiator is selected from one of aluminum, aluminum alloy, ceramic and quartz; the material of the cooling pipeline is selected from one of plastic, metal and quartz.
6. An electromagnetic heating apparatus according to claim 1, characterized in that: the medium heat dissipation unit is of an air cooling structure and comprises a heat dissipation fan; the heat transfer unit comprises a fixed end and a heat dissipation end which are fixedly connected, and the fixed end is arranged in the loop box and detachably fixed with the electronic element; the heat dissipation end penetrates and extends to the outside of the loop box, and the heat dissipation fan faces the heat dissipation end.
7. An electromagnetic heating apparatus according to claim 6, characterized in that: the electronic element comprises an IGBT and a rectifier bridge, and the IGBT and the rectifier bridge are detachably fixed to the fixed end of the heat transfer unit through a fixing clamp.
8. An electromagnetic heating apparatus according to claim 2 or 6, characterized in that: the circuit insulating part is a two-liquid type polyurethane resin and is filled in the loop box; the coil insulator is a liquid polyurethane resin, and is wrapped outside the heating coil.
9. An electromagnetic heating apparatus according to claim 8, characterized in that: the insulation assembly further includes a ceramic insulation sheet disposed between the electronic component and the heat transfer unit.
10. An electromagnetic heating apparatus according to claim 9, characterized in that: the heat-conducting heat-insulating plate is characterized in that a polyimide insulating glue is further arranged between the ceramic insulating plate and the electronic element and between the ceramic insulating plate and the heat transfer unit, and a heat-conducting silicone grease is further coated between the polyimide insulating glue and the ceramic insulating plate and between the electronic element and the heat transfer unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122558526.XU CN216650040U (en) | 2021-10-22 | 2021-10-22 | Electromagnetic heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122558526.XU CN216650040U (en) | 2021-10-22 | 2021-10-22 | Electromagnetic heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216650040U true CN216650040U (en) | 2022-05-31 |
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ID=81731029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122558526.XU Active CN216650040U (en) | 2021-10-22 | 2021-10-22 | Electromagnetic heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216650040U (en) |
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2021
- 2021-10-22 CN CN202122558526.XU patent/CN216650040U/en active Active
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