CN220834395U - Vacuum suction filtration device for medicine preparation - Google Patents
Vacuum suction filtration device for medicine preparation Download PDFInfo
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- CN220834395U CN220834395U CN202322575604.6U CN202322575604U CN220834395U CN 220834395 U CN220834395 U CN 220834395U CN 202322575604 U CN202322575604 U CN 202322575604U CN 220834395 U CN220834395 U CN 220834395U
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- cavity
- suction
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- nozzle
- filtration
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- 238000000967 suction filtration Methods 0.000 title claims abstract description 32
- 239000003814 drug Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 238000011110 re-filtration Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 24
- 238000003828 vacuum filtration Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229940079593 drug Drugs 0.000 claims description 3
- 239000000825 pharmaceutical preparation Substances 0.000 claims 8
- 229940127557 pharmaceutical product Drugs 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000003860 storage Methods 0.000 description 19
- 239000000243 solution Substances 0.000 description 18
- 230000009471 action Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000003186 pharmaceutical solution Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Landscapes
- Filtration Of Liquid (AREA)
Abstract
The utility model discloses a vacuum suction filtration device for medicine preparation, and relates to the technical field of medicine production equipment; the device comprises a suction filtration tank and a vacuum pump, wherein a first filter piece and a second filter piece are arranged in the suction filtration tank from top to bottom at intervals, and the filtration precision of the first filter piece is smaller than that of the second filter piece; the inner cavity of the suction filtration tank is divided into a liquid inlet cavity, a re-filtration cavity and a liquid outlet cavity from top to bottom by the first filter piece and the second filter piece in sequence, and the liquid inlet cavity is provided with a liquid inlet nozzle; a backflushing nozzle is arranged in the re-filtering cavity, an outlet of the backflushing nozzle is opposite to the first filtering piece, a first suction filter tip is arranged on the side wall of the re-filtering cavity, and the first suction filter tip is connected with an air suction end of the vacuum pump through a pressure regulating valve; the liquid outlet cavity is provided with a backflushing nozzle, a liquid outlet nozzle and a second suction filter tip, the second suction filter tip is connected with the air extraction end of the vacuum pump through a first switch valve, and the liquid outlet nozzle is connected with a fourth switch valve. The utility model does not need shutdown back flushing.
Description
Technical Field
The utility model relates to the technical field of medicine production equipment, in particular to a vacuum suction filtration device for medicine preparation.
Background
In the production process of pharmaceutical production, filtration of the pharmaceutical solution is generally performed by using a vacuum evacuation device to improve the filtration efficiency of the pharmaceutical solution. However, since the filtering precision of the filtering component (filter cloth) is high, the pore diameter of the filtering hole is small, the filtering component is easy to be blocked, a large amount of particles adhere to the surface of the filtering component after filtering for a period of time, the filtering capability is reduced, shutdown back flushing is required, and the overall filtering efficiency of the tablet solution is still low.
Disclosure of utility model
Aiming at the technical problem that the existing vacuum suction filter for medicine preparation needs to be shut down and back flush; the utility model provides a vacuum suction filtration device for medicine preparation, which can continuously perform vacuum suction filtration without stopping back flushing so as to improve the efficiency of medicine solution filtration.
The utility model is realized by the following technical scheme:
The utility model provides a vacuum suction filtration device for medicine preparation, which comprises a suction filtration tank and a vacuum pump, wherein a first filter piece and a second filter piece are arranged in the suction filtration tank from top to bottom at intervals, and the filtration precision of the first filter piece is smaller than that of the second filter piece; the inner cavity of the suction filtration tank is divided into a liquid inlet cavity, a secondary filtration cavity and a liquid outlet cavity from top to bottom by the first filter piece and the second filter piece in sequence, and the liquid inlet cavity is provided with a liquid inlet nozzle; a backflushing nozzle is arranged in the re-filtering cavity, an outlet of the backflushing nozzle is opposite to the first filtering piece, a first suction filter tip is arranged on the side wall of the re-filtering cavity, and the first suction filter tip is connected with an air suction end of the vacuum pump through a pressure regulating valve; the liquid outlet cavity is provided with a backflushing nozzle, a liquid outlet nozzle and a second suction filter tip, the second suction filter tip is connected with the air extraction end of the vacuum pump through a first switch valve, and the liquid outlet nozzle is connected with a second switch valve.
The utility model provides a vacuum suction filtration device for medicine preparation, which comprises a suction filtration tank inner cavity, a liquid inlet cavity, a secondary filtration cavity and a liquid outlet cavity, wherein the inner cavity of a suction filtration tank is divided into a first filtration part and a second filtration part from top to bottom, a first suction filter tip on the side wall of the secondary filtration cavity is connected with a suction end of a vacuum pump through a pressure regulating valve, a second suction filter tip of the liquid outlet cavity is connected with a suction end of the vacuum pump, when the vacuum suction filtration device works, liquid medicine to be filtered enters the liquid inlet cavity, the secondary filtration cavity and the liquid outlet cavity are simultaneously vacuumized through the vacuum pump, the vacuum degree in the secondary filtration cavity is regulated through a pressure regulating valve, so that the vacuum degree in the secondary filtration cavity is lower than that in the liquid medicine cavity, at the moment, the liquid medicine in the secondary filtration cavity is filtered through the second filtration part under the action of negative pressure in the liquid outlet cavity, and the filtration precision of the first filtration part is smaller than that of the second filtration part, so that particles are relatively large to be trapped on the first filtration part, and the blocking risk of the second filtration part is reduced. And primary filtration and secondary filtration are carried out simultaneously, so that the overall filtration efficiency is not affected.
The back flushing spray head opposite to the first filter piece is arranged in the re-filtering cavity, when the passing capacity of the first filter piece is greatly reduced, the pressure regulating valve is closed, back flushing liquid or high-pressure gas is output through the back flushing spray head to back flush the first filter piece, so that the first filter piece is enabled to recover the passing capacity, and when the first filter piece is back flushed, negative pressure still exists in the liquid outlet cavity, and the second filter piece still works normally.
In addition, the liquid outlet cavity is provided with a backflushing nozzle and is connected with the vacuum pump through a first switching valve, the liquid outlet nozzle is connected with a second switching valve, when the passing capacity of the second filter piece is greatly reduced, the backflushing nozzle is connected with a backflushing liquid storage tank or a high-pressure gas storage tank, so that corresponding media enter the liquid outlet cavity, negative pressure exists in the re-filter cavity at the moment, the first filter piece normally works, the first switching valve and the second switching valve are in a closed state, and the cleaning media reversely pass through the second filter piece under the combined action of the self pressure and the negative pressure in the re-filter cavity, so that the second filter piece is backwashed.
Therefore, the vacuum filtration device for medicine preparation provided by the utility model can continuously perform vacuum filtration without stopping back flushing, so that the medicine solution filtration efficiency is improved.
In an alternative embodiment, the first suction filter is located on the upper side wall of the re-filter chamber to avoid as much as possible that the solution in the re-filter chamber enters the first suction filter.
In an alternative embodiment, the inlet nozzle is arranged on the side wall of the liquid inlet cavity so as to facilitate the solution to enter the liquid inlet cavity from the side wall of the suction filtration tank.
In an optional embodiment, the liquid inlet cavity is internally provided with a stirring paddle, the top of the suction filtration tank is provided with a stirring motor, the stirring motor is in transmission connection with the stirring paddle, and the stirring motor drives the stirring paddle to rotate, so that the solution in the liquid inlet cavity can be driven to disturb, and the solution in the liquid inlet cavity is driven to continuously wash the first filter element, so that the blocking time of the first filter element is delayed.
In an alternative embodiment, the stirring paddle comprises a blade and a connecting shaft, one end of the connecting shaft is fixedly connected with the stirring motor, the other end of the connecting shaft extends towards the first filtering piece, and the blade is fixed at one end, far away from the stirring motor, of the connecting shaft, so that the blade can be ensured to be close to the first filtering piece as much as possible.
In an alternative embodiment, the pressure regulating valve is a three-way valve provided with two air inlets, one air inlet of the pressure regulating valve is connected with the first suction filter tip, and the other air inlet of the pressure regulating valve is communicated with the atmosphere, so that the vacuum degree in the re-filtering cavity can be regulated through the pressure regulating valve.
In an alternative embodiment, the device further comprises a gas storage tank, wherein the gas storage tank is connected with the backflushing nozzle through a third switch valve, so that purge gas with set pressure can be directly input into the liquid outlet cavity through the gas storage tank.
In an alternative embodiment, the air storage tank is connected with the backflushing nozzle through a fourth switch valve, so that high-pressure air in the air storage tank is directly backflushed to the first filtering piece through the backflushing nozzle.
In an alternative embodiment, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are two-position two-way electromagnetic valves, so as to realize automatic control.
In an alternative embodiment, the device further comprises a liquid storage tank, wherein the liquid storage tank is connected with the liquid outlet end of the second switch valve, so that the solution discharged from the liquid outlet cavity is stored directly through the liquid storage tank.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
1. The vacuum suction filtration device for medicine preparation provided by the utility model comprises a suction filtration tank inner cavity which is divided into a liquid inlet cavity, a liquid re-filtration cavity and a liquid outlet cavity from top to bottom by a first filtration piece and a second filtration piece, wherein the first suction filter on the side wall of the liquid re-filtration cavity is connected with the air suction end of a vacuum pump through a pressure regulating valve, the second suction filter of the liquid outlet cavity is connected with the air suction end of the vacuum pump, and the filtration precision of the first filtration piece is smaller than that of the second filtration piece, so that particles are relatively large trapped on the first filtration piece, and the blocking risk of the second filtration piece is reduced.
2. According to the vacuum suction filtration device for preparing medicines, the backflushing nozzle which is opposite to the first filter piece is arranged in the secondary filtration cavity, the second filtration can be performed while the first filter piece is backflushed, the liquid outlet cavity is provided with the backflushing nozzle and is connected with the vacuum pump through the first switching valve, and the liquid outlet nozzle is connected with the second switching valve, so that the primary filtration can be performed after the second filter piece is backflushed, the shutdown backflushing is not needed, and the vacuum suction filtration can be continuously performed, so that the efficiency of filtering medicine solution is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
In the drawings:
fig. 1 is a schematic structural diagram of a vacuum filtration device for drug preparation according to an embodiment of the present utility model.
In the drawings, the reference numerals and corresponding part names:
1-suction filtration tank, 2-vacuum pump, 3-first filter piece, 4-second filter piece, 5-feed liquor chamber, 6-re-filtration chamber, 7-play liquid chamber, 8-feed liquor mouth, 9-recoil shower nozzle, 10-first suction filtration mouth, 11-air-vent valve, 12-recoil mouth, 13-play liquid mouth, 14-second suction filtration mouth, 15-first switching valve, 16-second switching valve, 17-stirring rake, 18-stirring motor, 19-gas holder, 20-third switching valve, 21-fourth switching valve, 22-liquid storage pot.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the application, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Meanwhile, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples
With reference to fig. 1, this embodiment provides a vacuum filtration device for medicine preparation, which includes a filtration tank 1 and a vacuum pump 2, wherein a first filtration member 3 and a second filtration member 4 are disposed in the filtration tank 1 at intervals from top to bottom, and the filtration precision of the first filtration member 3 is smaller than the filtration precision of the second filtration member 4; the inner cavity of the suction filtration tank 1 is divided into a liquid inlet cavity 5, a re-filtration cavity 6 and a liquid outlet cavity 7 from top to bottom by the first filter element 3 and the second filter element 4 in sequence, and the liquid inlet cavity 5 is provided with a liquid inlet nozzle 8; a backflushing nozzle 9 is arranged in the re-filtering cavity 6, an outlet of the backflushing nozzle 9 is opposite to the first filtering piece 3, a first suction filter tip 10 is arranged on the side wall of the re-filtering cavity 6, and the first suction filter tip 10 is connected with a suction end of the vacuum pump 2 through a pressure regulating valve 11; the liquid outlet cavity 7 is provided with a backflushing nozzle 12, a liquid outlet nozzle 13 and a second suction filter tip 14, the second suction filter tip 14 is connected with the air exhaust end of the vacuum pump 2 through a first switch valve 15, and the liquid outlet nozzle 13 is connected with a second switch valve 16.
Specifically, the first filter 10 is located on the upper side wall of the re-filter chamber 6, so as to avoid the solution in the re-filter chamber 6 from entering the first filter 10 as much as possible.
It will be appreciated that the inlet nozzle 8 is provided on the side wall of the inlet chamber 5 to facilitate the passage of solution from the side wall of the suction canister 1 into the inlet chamber 5.
The pressure regulating valve 11 is a three-way valve with two air inlets, one air inlet of the pressure regulating valve 11 is connected with the first suction filter 10, and the other air inlet is communicated with the atmosphere, so that the vacuum degree in the re-filtering cavity 6 can be regulated by the pressure regulating valve 11.
In this embodiment, the air storage tank 19 is further included, and the air storage tank 19 is connected to the backflushing nozzle 12 through a third switch valve 20, so that the purge gas with the set pressure is directly input to the liquid outlet cavity 7 through the air storage tank 19.
Similarly, the air storage tank 19 is connected with the back flushing nozzle 9 through a fourth switch valve 21, so that the high-pressure air in the air storage tank 19 is directly back flushed to the first filtering piece 3 through the back flushing nozzle 9.
In general, the first switch valve 15 is connected in series with the vacuum pump 2, so as to control whether the vacuum pump 2 draws vacuum from the liquid outlet cavity 7.
Typically, the apparatus further comprises a liquid storage tank 22, and the liquid storage tank 22 is connected to the liquid outlet end of the second switch valve 16, so as to store the solution discharged from the liquid outlet cavity 7 directly through the liquid storage tank 22.
The on-off valve and the pressure regulating valve 11 in the present embodiment are each an electronically controlled valve to achieve automatic control. In this embodiment, the first switching valve 15, the second switching valve 16, the third switching valve 20, and the fourth switching valve 21 are two-position two-way solenoid valves.
On the basis, be provided with stirring rake 17 in the feed liquor chamber 5, suction filtration jar 1 top is provided with agitator motor 18, agitator motor 18 with stirring rake 17 transmission is connected, drives stirring rake 17 through agitator motor 18 and rotates, can drive the solution disturbance in the feed liquor chamber 5 to drive the solution in the feed liquor chamber 5 constantly erodees first filter 3, in order to delay the time that first filter 3 blockked up.
Specifically, the stirring paddle 17 includes a blade and a connecting shaft, one end of the connecting shaft is fixedly connected with the stirring motor 18, the other end of the connecting shaft extends toward the first filter element 3, and the blade is fixed at one end of the connecting shaft away from the stirring motor 18, so as to ensure that the blade can be close to the first filter element 3 as much as possible.
It should be noted that, in the vacuum filtration device for preparing a medicine provided in this embodiment, during operation, the liquid medicine to be filtered is input into the liquid inlet cavity 5, the third switch valve 20 and the fourth switch valve 21 are closed, the first switch valve and the pressure regulating valve 11 are opened, vacuum is simultaneously pumped into the re-filtration cavity 6 and the liquid outlet cavity 7 through the vacuum pump 2, and the vacuum degree in the re-filtration cavity 6 is regulated through the pressure regulating valve 11, so that the vacuum degree in the re-filtration cavity 6 is lower than that in the liquid outlet cavity 7, at this time, the liquid medicine is primarily filtered through the first filtration element 3 under the action of negative pressure in the re-filtration cavity 6, the liquid medicine in the re-filtration cavity 6 is filtered again through the second filtration element 4 under the action of negative pressure in the liquid outlet cavity 7, and the filtration precision of the first filtration element 3 is lower than that of the second filtration element 4, so that particles are relatively large and trapped on the first filtration element 3, and the risk of blocking the second filtration element 4 is reduced. And primary filtration and secondary filtration are carried out simultaneously, so that the overall filtration efficiency is not affected.
When the passing capacity of the first filter element 3 is greatly reduced, the pressure regulating valve 11 is closed, the fourth switching valve 21 is opened, high-pressure gas is output through the backflushing nozzle 9 to backflush the first filter element 3, so that the passing capacity of the first filter element 3 is recovered, and when the first filter element 3 is backflushed, the vacuum pump 2 continuously pumps negative pressure into the liquid outlet cavity 7, negative pressure still exists in the liquid outlet cavity 7, and the second filter element 4 still works normally.
When the passing capacity of the second filter element 4 is greatly reduced, the third switch valve 20 is opened, the first switch valve 15 and the second switch valve 16 are closed, so that corresponding media enter the liquid outlet cavity 7, the pressure regulating valve 11 is in an open state, the vacuum pump 2 pumps negative pressure into the re-filtering cavity, so that negative pressure exists in the re-filtering cavity 6, the first filter element 3 normally works, and high-pressure gas reversely passes through the second filter element 4 under the combined action of the self pressure and the negative pressure in the re-filtering cavity 6, so that back flushing is carried out on the second filter element 4.
In addition, during the back flushing process, gas is input, and the gas entering the re-filtering cavity 6 is pumped by the vacuum pump 2, so that the filtering workload is not increased.
Therefore, the vacuum filtration device for medicine preparation provided by the embodiment can continuously perform vacuum filtration without stopping back flushing, so that the medicine solution filtration efficiency is improved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The vacuum suction filtration device for preparing medicines comprises a suction filtration tank (1) and a vacuum pump (2), and is characterized in that a first filter piece (3) and a second filter piece (4) are arranged in the suction filtration tank (1) from top to bottom at intervals, and the filtration precision of the first filter piece (3) is smaller than that of the second filter piece (4);
The inner cavity of the suction filtration tank (1) is divided into a liquid inlet cavity (5), a re-filtration cavity (6) and a liquid outlet cavity (7) from top to bottom by the first filter piece (3) and the second filter piece (4), and the liquid inlet cavity (5) is provided with a liquid inlet nozzle (8);
A backflushing nozzle (9) is arranged in the re-filtering cavity (6), an outlet of the backflushing nozzle (9) is opposite to the first filtering piece (3), a first suction filter tip (10) is arranged on the side wall of the re-filtering cavity (6), and the first suction filter tip (10) is connected with an air suction end of the vacuum pump (2) through a pressure regulating valve (11);
The liquid outlet cavity (7) is provided with a backflushing nozzle (12), a liquid outlet nozzle (13) and a second suction filter nozzle (14), the second suction filter nozzle (14) is connected with the air exhaust end of the vacuum pump (2) through a first switch valve (15), and the liquid outlet nozzle (13) is connected with a second switch valve (16).
2. Vacuum filtration device for pharmaceutical preparation according to claim 1, characterized in that the first suction filter (10) is located at the upper end side wall of the re-filtration chamber (6).
3. Vacuum filtration device for pharmaceutical preparation according to claim 1, characterized in that the inlet mouth (8) is arranged at the side wall of the inlet chamber (5).
4. A vacuum filtration device for medicine preparation according to claim 3, characterized in that a stirring paddle (17) is arranged in the liquid inlet cavity (5), a stirring motor (18) is arranged at the top of the filtration tank (1), and the stirring motor (18) is in transmission connection with the stirring paddle (17).
5. Vacuum filtration device for pharmaceutical preparation according to claim 4, characterized in that the stirring paddle (17) comprises a blade and a connecting shaft, one end of the connecting shaft is fixedly connected with the stirring motor (18), the other end extends towards the first filter element (3), and the blade is fixed at the end of the connecting shaft away from the stirring motor (18).
6. Vacuum filtration device for the preparation of pharmaceutical products according to claim 1, characterized in that said pressure regulating valve (11) is a three-way valve provided with two air inlets, one air inlet of said pressure regulating valve (11) being connected to said first filter (10) and the other air inlet being open to the atmosphere.
7. Vacuum filtration device for pharmaceutical preparation according to claim 1, further comprising a gas reservoir (19), said gas reservoir (19) being connected to said backflushing nozzle (12) by means of a third switching valve (20).
8. Vacuum filtration device for pharmaceutical preparation according to claim 7, characterized in that the air reservoir (19) is connected to the backflushing nozzle (9) through a fourth switching valve (21).
9. Vacuum filtration device for pharmaceutical preparation according to claim 8, characterized in that the first switching valve (15), the second switching valve (16), the third switching valve (20) and the fourth switching valve (21) are two-position two-way solenoid valves.
10. Vacuum filtration device for pharmaceutical preparation according to any of claims 1-9, further comprising a liquid reservoir (22), said liquid reservoir (22) being connected to the liquid outlet end of said second switch valve (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575604.6U CN220834395U (en) | 2023-09-21 | 2023-09-21 | Vacuum suction filtration device for medicine preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322575604.6U CN220834395U (en) | 2023-09-21 | 2023-09-21 | Vacuum suction filtration device for medicine preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220834395U true CN220834395U (en) | 2024-04-26 |
Family
ID=90739176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322575604.6U Active CN220834395U (en) | 2023-09-21 | 2023-09-21 | Vacuum suction filtration device for medicine preparation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220834395U (en) |
-
2023
- 2023-09-21 CN CN202322575604.6U patent/CN220834395U/en active Active
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