CN217796182U - Biochemical plastic pipe - Google Patents
Biochemical plastic pipe Download PDFInfo
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- CN217796182U CN217796182U CN202221656964.8U CN202221656964U CN217796182U CN 217796182 U CN217796182 U CN 217796182U CN 202221656964 U CN202221656964 U CN 202221656964U CN 217796182 U CN217796182 U CN 217796182U
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Abstract
The utility model discloses a biochemical plastic pipe, which comprises a pipe body, a water injection cavity arranged at one end of the opening of the pipe body and a water injection deep hole communicated with the water injection cavity; one side of the water injection deep hole is provided with an air outlet deep hole communicated with the water injection cavity; and the water injection deep hole is communicated with at least the bottom of the air outlet deep hole, and the width of the communicated part is smaller than the diameter of the water injection deep hole. The utility model discloses after filling liquid from the water injection chamber, liquid sinks the hole bottom along the water injection deep hole, the hole bottom air gets into the deep hole of giving vent to anger from the intercommunication department, and discharge from the hole, make liquid sink gently wholly, can not plug up because of the unable discharge of inside air when injecting into liquid, stand upside down when the plastic tubing, the air flows in the bottom of water injection deep hole once more by the deep hole of giving vent to anger, fill the cavity space that solution flows, the solution of being convenient for flows the water injection chamber, liquid can not be hindered by downthehole air in intraductal flow, and is labor-saving and convenient to use.
Description
Technical Field
The utility model relates to the field of medical equipment, especially, relate to a biochemical plastic pipe.
Background
When the existing biochemical plastic pipe, especially a small-caliber biochemical plastic pipe is used, due to the existence of surface tension, convection between gas and liquid in the pipe is difficult to form, although when the pipe body is heated, a water column in the pipe exceeds a high-temperature part, and a certain temperature difference can be formed between the water column and the water in the high-temperature part under the heat conduction action of air or other objects with lower temperature, so that the lateral convection of the internal aqueous solution is formed. However, in the two steps of injecting the liquid into the bottom of the tube body and inverting the tube body to make the liquid flow into the filling cavity from the bottom, the flow of the liquid is very poor, and the liquid is easily dispersed. In this case, a centrifuge or a tube is usually forcibly swung to smoothly collect liquid into the tube or a tube opening, which has a large limitation in use, but the forced swinging increases the difficulty in operation, which makes the liquid easily leak, and a large amount of bubbles are mixed in the liquid during swinging to affect the subsequent operation. Therefore, it is necessary to design a biochemical plastic tube which can solve the above technical problems, facilitate the liquid filling and the experiment operation, lead out the air in the tube, make the liquid flow smoothly in the tube body, and is not easy to be doped with bubbles.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a make things convenient for filling liquid and experimental operation, the air in the derivation pipe makes liquid smoothly flow in the body, is difficult for the biochemical plastic tubing of adulteration bubble.
Realize the utility model discloses the technical scheme of purpose is: a biochemical plastic pipe comprises a pipe body, a water injection cavity arranged at one end of an opening of the pipe body and a water injection deep hole communicated with the water injection cavity; one side of the water injection deep hole is provided with an air outlet deep hole communicated with the water injection cavity;
wherein the water injection deep hole with the deep hole of giving vent to anger at least bottom intercommunication, and the intercommunication department width is less than the water injection deep hole diameter.
Furthermore, the air outlet deep hole extends upwards from the opening to form a water blocking surrounding plate and is integrally formed with the air outlet deep hole.
Specifically, the height of the water blocking enclosing plate is not less than 2mm.
Furthermore, a water-repellent air guide rod is arranged in the air outlet deep hole; the outer surface of the water-repellent air guide rod is provided with a plurality of vertical air guide grooves which are communicated with the water injection cavity and the bottoms of the air outlet deep holes; and a gap is formed between the bottom surface of the inner wall of the air outlet deep hole and the bottom surface of the water and air guide rod.
Furthermore, the air outlet deep hole is provided with a water-blocking enclosing plate which is wrapped with a water-blocking air guide rod and extends upwards from the opening.
Furthermore, a bulge which is abutted against the bottom surface of the inner wall of the air outlet deep hole is arranged on one side, away from the air outlet deep hole, of the bottom of the water-repellent air guide rod; the inner walls of the bulges and the air outlet deep holes are encircled to form a water-repellent air-guide cavity communicated with the water injection deep holes and the vertical air-guide groove.
Further, the height of the water and air conducting cavity is as small as possible, so that air can circulate under the action of the surface tension of water, and the water is prevented from entering as much as possible.
Furthermore, a fixing part for fixing the water-repellent air guide rod is arranged in a contact area of the inner wall of the air outlet deep hole and the water-repellent air guide rod; the fixing part is a convex ring arranged on the inner wall of the air outlet deep hole and a groove on the water-repellent air guide rod, or a groove arranged on the inner wall of the air outlet deep hole and a convex ring on the water-repellent air guide rod.
Furthermore, the water injection deep hole is made of hydrophilic plastics, preferably one of PET plastics, PC plastics, ABS plastics, PA plastics and PPO plastics; the water-repellent air guide rod is made of hydrophobic plastics, preferably one of PP plastics, PVC plastics, PS plastics and PE plastics.
Further, a gap which is communicated with the water injection deep hole and the air outlet deep hole is arranged between the water injection deep hole and the air outlet deep hole.
Furthermore, the water-repellent air guide rod is radially provided with an inserting strip matched with the gap.
Preferably, two vertical air guide grooves are formed in the two vertical air guide grooves and are respectively arranged on two sides of the inserting strip.
Furthermore, the thickness of the inner walls of the water injection deep hole and the air outlet deep hole is not more than 0.18mm.
Furthermore, at least one guide reinforcing rib which extends upwards from the bottom surface of the water injection deep hole to the opening of the water injection deep hole is arranged on the side wall of the water injection deep hole.
By adopting the technical scheme, the utility model discloses following beneficial effect has:
(1) The utility model discloses after filling liquid from the water injection chamber, liquid sinks the hole bottom along the water injection deep hole, the hole bottom air gets into the deep hole of giving vent to anger from the intercommunication department, and discharge from the hole, make liquid sink gently wholly, can not plug up because of the unable discharge of inside air when injecting into liquid, stand upside down when the plastic tubing, the air flows in the bottom of water injection deep hole once more by the deep hole of giving vent to anger, fill the cavity space that solution flows, the solution of being convenient for flows the water injection chamber, liquid can not be hindered by downthehole air in intraductal flow, and is labor-saving and convenient to use.
(2) The utility model discloses a bellied bounding wall that blocks water prevents that water injection intracavity liquid from getting into the deep hole of giving vent to anger, can prevent effectively that the deep hole of giving vent to anger from being flooded by solution, avoids gaseous unable circulation.
(3) The utility model discloses a set up the water of having vertical air guide groove in the deep hole of giving vent to anger and refuse the water air guide stick, and give vent to anger deep hole inner wall bottom surface and refuse the water air guide stick bottom surface and be equipped with the clearance, can prevent liquid entering deep hole of giving vent to anger, make the smooth and easy circulation of downthehole air to make things convenient for liquid flow, avoid liquid stagnation, or sneak into the bubble in the whipping.
(4) The utility model discloses insert in the deep hole of giving vent to anger and refuse the water air guide stick, protruding and the deep hole bottom surface butt of giving vent to anger, the arch encloses into the water of intercommunication water injection deep hole and vertical air guide groove promptly with the deep hole inner wall of giving vent to anger and refuse the air guide chamber, makes things convenient for the circulation of air, and the operation is very convenient.
(5) The utility model discloses a protruding ring and the fixed water air guide stick of refusing of recess that agree with make refuse water air guide stick firmly fixed after inserting the deep hole of giving vent to anger, can not the roll-off, and is very convenient.
(6) The utility model discloses a water injection deep hole adopts hydrophilic plastics, makes things convenient for liquid to flow, refuses water gas guide stick and adopts hydrophobic plastics, prevents that liquid from getting into vertical air guide groove under the effect of surface tension.
(7) The utility model discloses a cutting inserts the gap, can effectively fix refusing the water air guide stick, prevents to refuse the rotation of water air guide stick.
(8) The utility model discloses a refuse and lead gas stick bottom and be provided with solitary refuse and lead gas chamber, make things convenient for gaseous flow.
(9) The utility model discloses an inner wall thickness of water injection deep hole is little, and heat conduction efficiency is high, and temperature control effect is good.
(10) The utility model discloses the setting of strengthening rib not only can multiplicable when moulding plastics the mobility of plastic, guarantees that injection moulding is stable, also increases structural strength simultaneously, is convenient for guarantee and the laminating and the heat transfer of heating seat.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is given in conjunction with the accompanying drawings, in which
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic cross-sectional view of embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of embodiment 1 of the present invention without a tube cover.
Fig. 4 is a schematic structural view of embodiment 2 of the present invention without a pipe cover.
Fig. 5 is a schematic cross-sectional view of embodiment 2 of the present invention.
FIG. 6 is a schematic structural view of embodiment 3 of the present invention without pipe cover
Fig. 7 is a schematic cross-sectional view of embodiment 3 of the present invention.
Fig. 8 is a schematic structural view of a water and gas repellent rod according to embodiment 3 of the present invention.
The reference numbers in the drawings are as follows: a tube cover 1; a water injection cavity 2; water injection deep holes 3;
the air outlet deep hole 4, the water-blocking surrounding plate 41 and the water-blocking air-conducting cavity 42;
a water-repellent air guide rod 5, a vertical air guide groove 51 and an inserting strip 52;
and a fixing portion 6.
Detailed Description
(example 1)
Referring to fig. 1 to 3, the biochemical plastic tube of the embodiment includes a tube body and a tube cap 1. The pipe body comprises a water injection cavity 2 arranged at one end of an opening of the pipe body and a water injection deep hole 3 communicated with the water injection cavity 2; and an air outlet deep hole 4 communicated with the water injection cavity 2 is arranged on one side of the water injection deep hole 3.
A water-repellent air guide rod 5 is arranged in the air outlet deep hole 4. The outer surface of the water-repellent air guide rod 5 is provided with a plurality of vertical air guide grooves 51 in the whole length. The surface tension of the plastic pipe body and the hydrophobic water-repellent air guide rod 5 and the narrow gap between the vertical air guide groove 51 and the inner wall of the air outlet deep hole 4 are utilized to prevent liquid from entering, so that the air in the hole can be effectively discharged, the liquid is prevented from being dispersed, bubbles are not easy to dope, and the water-repellent air guide rod 5 can also play a role in strengthening the structural strength of the air outlet deep hole 4.
Specifically, the deviation between the diameter of the water-repellent air guide rod 5 and the inner diameter of the air outlet deep hole 4 is not more than 0.2mm, so that the water-repellent air guide rod 5 is tightly attached to the air outlet deep hole 4, and gaps, air or liquid are prevented from remaining.
In some embodiments, a gap is formed between the water injection deep hole 3 and the air outlet deep hole 4, and the gap penetrates through the water injection deep hole 3 and the air outlet deep hole 4. Refuse radially on the gas guide rod 5 be equipped with gap complex cutting 52, insert the gap through cutting 52, can effectively fix and refuse water gas guide rod 5, prevent to refuse water gas guide rod 5 and rotate.
The bottom of the water-repellent air guide rod 5 facing the air outlet deep hole 4 and the inner wall of the air outlet deep hole 4 form a water-repellent air guide cavity 42 for air circulation. The height of the water-repellent air-guide cavity 42 is as small as possible to prevent water from entering under the premise of air circulation, and the vertical air-guide groove 51 communicates the water-repellent air-guide cavity 42 with the gap.
Specifically, the water-repellent air-conducting cavity 42 is formed by arranging a raised step on the side of the bottom surface of the water-repellent air-conducting rod 5 far away from the air outlet deep hole 4, so that the air can flow conveniently.
Specifically, two vertical air guide grooves 51 are provided, and are respectively provided on two sides of the cutting bar 52, so that air in the water injection deep hole 3 and the air outlet deep hole 4 can be discharged as much as possible.
In some embodiments, a fixing part 6 for fixing the water-repellent air-guide rod 5 is arranged on the inner wall of the air-outlet deep hole 4 and the water-repellent air-guide rod 5. The fixing part 6 is a convex ring arranged on the inner wall of the air outlet deep hole 4 and a groove on the water-repellent air guide rod 5, or a groove arranged on the inner wall of the air outlet deep hole 4 and a convex ring on the water-repellent air guide rod 5.
Specifically, the water-repellent air-guide bar 5 is hydrophobic plastic, preferably one of PP plastic, PVC plastic, PS plastic and PE plastic.
In some embodiments, the water injection deep hole 3 is made of hydrophilic plastic, preferably one of PET plastic, PC plastic, ABS plastic, PA plastic and PPO plastic, so as to facilitate the liquid flowing in the water injection deep hole 3 and further prevent the liquid from entering the air outlet deep hole 4.
In some embodiments, the thicknesses of the inner walls of the water injection deep hole 3 and the air outlet deep hole 4 are not more than 0.18mm, the heat transfer efficiency is high, the heating is convenient, and the reaction temperature can be accurately controlled.
In some embodiments, the side walls of the water filling hole 3 are provided with at least one rib 31 extending from the bottom of the water filling hole 3 up to the opening of the water filling hole 3. The arrangement of the reinforcing ribs 31 can not only increase the flowability of the plastic during injection molding and ensure the stability of injection molding, but also increase the structural strength and ensure the attachment and heat transfer with the heating seat.
In some embodiments, the cap 1 and the tube body are provided with a sealing portion for sealing the biochemical plastic tube. The sealing is at least a set of recess that sets up on the bulge loop of body inner wall and tube cap 1 outer wall, or sets up the recess of body inner wall and the bulge loop on the tube cap 1 outer wall, can realize that the multistage is sealed, can one section sealed conveniently open, perhaps three-section sealed lock dies to prevent to open, adapts to different use scenes, and is sealed through sealing ring and seal groove, and is convenient firm, difficult weeping.
In some embodiments, the top end of the tube cover 1 is provided with a liquid taking port, and the liquid taking port is coated with a film to facilitate taking out after heating is completed.
The use mode of the embodiment is as follows: liquid is after the water injection chamber 1 is annotated, through water injection deep hole 3 inflow deep hole bottom, air is in proper order in the water injection deep hole 3 through gap and water gas guide cavity 42 of refusing, get into vertical air guide groove 51, lead to in the water injection chamber 1 by vertical air guide groove 51, can effectively discharge downthehole air, it is intraductal to prevent to lead to the unable admission pipe of liquid because of liquid surface pressure, when standing upside down with the plastic tubing, when solution whipping in with the pipe, the air is by the bottom of giving vent to anger deep hole 4 inflow water injection deep hole 3 once more, fill the space that solution flows, the solution of being convenient for flows in water injection chamber 1, liquid can not blockked by downthehole air in the intraductal flow, and can avoid rocking or the oscillation leads to the internal bubble of sneak into of liquid, thereby improve experimental accuracy nature.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages: the water injection deep hole 3 made of hydrophilic materials increases the liquidity of liquid; the water-repellent air guide bar 5 made of hydrophobic materials can reduce liquid adsorption and prevent liquid from entering the vertical air guide groove 51 under the action of surface tension; the water-repellent air guide rod 51 is firmly fixed in the air outlet deep hole 4 through the matching of the convex ring and the groove and the matching of the inserting strip 52 and the gap, and cannot shake; the water-repellent air-guide rod 51 forms a water-repellent air-guide cavity 42 communicated with the gap through the bulge at the bottom, so that the air can smoothly circulate.
(example 2)
Referring to fig. 4 and 5, the biochemical plastic tube of the present embodiment includes a tube body and a tube cover 1. The body is including setting up water injection chamber 2 on body upper portion and the water injection deep hole 3 and the deep hole 4 of giving vent to anger that communicate with water injection chamber 2. The water injection deep hole 3 and the air outlet deep hole 4 are arranged side by side, and the bottoms of the water injection deep holes are communicated. When the plastic pipe is inverted, the plastic pipe is swung, air flows into the bottom of the water injection deep hole again through the air outlet deep hole, the cavity space where the solution flows out is filled, the solution can flow outwards conveniently, the liquid can not be blocked by the air in the hole when flowing in the pipe, and the use is labor-saving and convenient.
Further, the opening of the air outlet deep hole 4 extends upwards to form a water blocking enclosing plate 41. The apron 41 that blocks water live 4 openings in the deep hole of giving vent to anger with the sealing washer, after filling liquid from water injection chamber 2, liquid blocks water the apron 41 and can get into the deep hole 4 of giving vent to anger, and filling liquid sinks into the hole bottom along water injection deep hole 3, and hole bottom air gets into the deep hole 4 of giving vent to anger from bottom intercommunication department to discharge from downthehole, make liquid sink gently wholly, can not plug up because of the unable discharge of inside air when pouring into liquid, need not to throw away by a wide margin during the use, and it is convenient to use laborsaving.
Specifically, the water blocking fence 41 has a height of not less than 2mm. The pipe body and the pipe cover 2 are made of plastic materials. The inner diameter of the water injection deep hole 3 is less than 2mm.
Specifically, the water injection deep hole 3 is made of hydrophilic plastic, preferably one of PET plastic, PC plastic, ABS plastic, PA plastic and PPO plastic, so that liquid can flow in the water injection deep hole 3 conveniently, and the liquid is further prevented from entering the air outlet deep hole 4.
Specifically, the thicknesses of the inner walls of the water injection deep hole 3 and the air outlet deep hole 4 are not more than 0.18mm, the heat transfer efficiency is high, and the heating is convenient
In some embodiments, the side walls of the water filling hole 3 are provided with at least one rib 31 extending from the bottom of the water filling hole 3 up to the opening of the water filling hole 3. The setting of strengthening rib 31 not only can increase the mobility of plastic when moulding plastics, guarantees that injection moulding is stable, also increases structural strength simultaneously, is convenient for guarantee with the laminating and the heat transfer of heating seat.
The tube cover 1 and the tube body are provided with sealing parts for sealing the biochemical plastic tube. The sealing part is at least a set of grooves arranged on the convex ring of the inner wall of the pipe body and the outer wall of the pipe cover 1, or the grooves arranged on the inner wall of the pipe body and the convex ring on the outer wall of the pipe cover 1, and the sealing part is sealed by the sealing ring and the sealing groove, is convenient and firm and is not easy to leak liquid.
This embodiment has at least the following advantages when in use: the liquid can sink integrally after being injected, the liquid does not need to be thrown greatly, the liquid sinks, when the plastic pipe is inverted, the plastic pipe is thrown, air flows into the bottom of the water injection deep hole again from the air outlet deep hole, the cavity where the solution flows out is filled, the solution flows outwards conveniently, the liquid cannot be blocked by the air in the hole when flowing in the pipe, and the use is labor-saving and convenient; the raised water-blocking surrounding plate prevents liquid in the water injection cavity from entering the air outlet deep hole, can effectively prevent the air outlet deep hole from being submerged by the solution, and avoids the situation that the gas cannot circulate; the water injection deep hole is made of hydrophilic plastic, so that liquid can flow conveniently.
(example 3)
This embodiment is substantially the same as embodiment 1 except that: referring to fig. 6 to 8, in order to prevent the vertical air guide groove 51 from being blocked by liquid, the opening of the air outlet deep hole 4 is provided with a water-blocking surrounding plate 41 surrounding the water-repellent air guide rod 5.
Specifically, the water blocking surrounding plate 41 and the air outlet deep hole 4 are integrally formed. The height of the water blocking enclosing plate 41 is not less than 2mm. The enclosing plate 41 for blocking water surrounds the water-repellent air guide rod, so that the vertical air guide groove 51 can be effectively prevented from being submerged by solution when the solution is dripped, and the gas cannot circulate.
Specifically, the top of the water-repellent air-guide rod 5 is higher than the water-blocking enclosing plate 41. The vertical air guide groove 51 is communicated with the water injection cavity 2 and the water-repellent air guide cavity 42, and further plays a role in preventing the vertical air guide groove 51 from being blocked by liquid.
In some embodiments, the fixing portion 6 is a convex ring disposed on the inner wall of the water-blocking enclosure 41 and a groove on the water-repellent air-guiding rod 5, or a concave ring disposed on the inner wall of the water-blocking enclosure 41 and a convex ring disposed on the water-repellent air-guiding rod 5.
The use mode of the embodiment is as follows: the technical scheme in the embodiment of the application at least has the following technical effects or advantages: the apron 41 that blocks water packs up and refuses gas guide rod 5, and refuses water gas guide rod 5 and be higher than apron 42 that blocks water, and liquid is through the water injection chamber 1 back of annotating, and the apron 41 that blocks water can prevent effectively that liquid from plugging up the department of giving vent to anger of vertical air guide groove 51, can effectively guarantee the unobstructed of vertical air guide groove 51.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A biochemical plastic tube is characterized in that: the device comprises a pipe body, a water injection cavity arranged at one end of an opening of the pipe body and a water injection deep hole communicated with the water injection cavity; one side of the water injection deep hole is provided with a gas outlet deep hole communicated with the water injection cavity;
wherein the water injection deep hole is communicated with at least the bottom of the air outlet deep hole.
2. A biochemical plastic tube according to claim 1, wherein: and a water-blocking surrounding plate is arranged at the opening of the air outlet deep hole.
3. A biochemical plastic tube according to claim 1, wherein: a water-repellent air guide rod is arranged in the air outlet deep hole; the outer surface of the water-repellent air guide rod is provided with a plurality of vertical air guide grooves which are communicated with the water injection cavity and the bottoms of the air outlet deep holes; the bottom surface of the water-repellent air guide rod is provided with a water-repellent air guide cavity for communicating the water injection deep hole with the vertical air guide groove.
4. A biochemical plastic tube according to claim 3, wherein: and the air outlet deep hole extends upwards from the opening to form a water-blocking surrounding plate for wrapping the water-repellent air guide rod.
5. A biochemical plastic tube according to claim 3, wherein: a bulge abutted with the bottom surface of the inner wall of the air outlet deep hole is arranged on one side of the bottom of the water-repellent air guide rod, which is far away from the air outlet deep hole; the bulge and the inner wall of the air outlet deep hole are encircled to form a water-repellent air-conducting cavity which is communicated with the water injection deep hole and the vertical air-conducting groove.
6. A biochemical plastic tube according to claim 3, wherein: a gap for communicating the water injection deep hole and the air outlet deep hole is arranged between the water injection deep hole and the air outlet deep hole; and the water-repellent air guide rod is provided with an inserting strip matched with the gap.
7. A biochemical plastic tube according to claim 3, wherein: and a fixing part for fixing the water-repellent air guide rod is arranged in a contact area of the inner wall of the air outlet deep hole and the water-repellent air guide rod.
8. A biochemical plastic tube according to claim 3, wherein: the water injection deep hole is made of hydrophilic plastic; the water-repellent air guide rod is made of hydrophobic plastic.
9. A biochemical plastic tube according to claim 1, wherein: the thickness of the inner wall of the water injection deep hole is not more than 0.18mm.
10. A biochemical plastic tube according to claim 9, wherein: and at least one guide reinforcing rib which extends upwards from the bottom surface of the water injection deep hole to the opening of the water injection deep hole is arranged on the side wall of the water injection deep hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221656964.8U CN217796182U (en) | 2022-06-30 | 2022-06-30 | Biochemical plastic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221656964.8U CN217796182U (en) | 2022-06-30 | 2022-06-30 | Biochemical plastic pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217796182U true CN217796182U (en) | 2022-11-15 |
Family
ID=83961132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221656964.8U Active CN217796182U (en) | 2022-06-30 | 2022-06-30 | Biochemical plastic pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217796182U (en) |
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2022
- 2022-06-30 CN CN202221656964.8U patent/CN217796182U/en active Active
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