CN217462449U - Hydraulic unit of pneumatic booster pump - Google Patents
Hydraulic unit of pneumatic booster pump Download PDFInfo
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- CN217462449U CN217462449U CN202220249217.6U CN202220249217U CN217462449U CN 217462449 U CN217462449 U CN 217462449U CN 202220249217 U CN202220249217 U CN 202220249217U CN 217462449 U CN217462449 U CN 217462449U
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Abstract
The utility model relates to the technical field of pneumatic pumps, in particular to a hydraulic unit of a pneumatic booster pump, which comprises an air pressing part main body, wherein an air pressing cover is arranged on the air pressing part main body, and a wool felt is arranged in the air pressing cover; an exhaust valve seat and an exhaust valve cover are arranged inside the upper end of the air pressing part main body, an exhaust valve core is movably arranged in the exhaust valve seat, the exhaust valve seat is matched with the exhaust valve core, and the air pressing part main body is arranged on the exhaust valve cover; and the lower end of the exhaust valve cover is movably provided with an air pressure reversing piston. The utility model provides a pneumatic booster pump hydraulic unit wherein improves the inside structure of pneumatics splenium main part, has effectively promoted the motion frequency of pneumatics piston for the holistic play oil of device and oil return speed promote greatly, compact structure moreover, work is steady, makes the part participate in simultaneously gaseous getting rid of through silencing device, avoids exploding the sound, has reduced the noise.
Description
Technical Field
The utility model relates to a pneumatic pump technical field especially relates to a pneumatic booster pump hydraulic unit.
Background
The hydraulic booster pump is an ultrahigh pressure hydraulic component for amplifying hydraulic pressure by utilizing the principle that the action areas of two ends of a piston are different and the stress sizes are the same, and the hydraulic booster pump can increase the low-pressure to 200MPa or above. At present, the traditional hydraulic booster pump adopted in China controls the booster pump to reciprocate and continuously output high pressure through continuous reversing of an electromagnetic reversing valve.
The existing hydraulic booster pump has low sensitivity and long response time, so that the oil outlet speed and the oil return speed are low, and the working efficiency is low.
To the above problem, the utility model provides a pneumatic booster pump hydraulic unit.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims to solve the problem lie in to above-mentioned prior art in not enough, provide a pneumatic booster pump hydraulic unit, can solve current hydraulic booster pump's sensitivity not high, response time is longer, leads to the speed of producing oil and oil return all very slow, the lower problem of work efficiency.
(II) technical scheme
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a hydraulic unit of a pneumatic booster pump comprises an air pressing part main body, wherein an air pressing cover is arranged on the air pressing part main body, and a wool felt is arranged in the air pressing cover; an exhaust valve seat and an exhaust valve cover are arranged inside the upper end of the air pressing part main body, an exhaust valve core is movably arranged in the exhaust valve seat, the exhaust valve seat is matched with the exhaust valve core, and the air pressing part main body is arranged on the exhaust valve cover;
the lower end of the exhaust valve cover is movably provided with an air pressure reversing piston, an upper retaining ring matched with the air pressure reversing piston is arranged at a position, close to the air pressure reversing piston, in the air pressure part main body, the outer wall of the air pressure reversing piston is provided with a lower retaining ring at the lower end of the upper retaining ring, and a pressurizing plunger rod is movably connected in the air pressure reversing piston;
the lower end of the air pressing part main body is sequentially provided with an air pressing part and an oil pressure part, and the pressurization plunger rod is matched with the air pressing part and the oil pressure part to work.
Preferably, the lower end of the exhaust valve cover is provided with a groove;
the outer wall of the upper end of the air compression reversing piston is sleeved with a sealing ring, and the air compression reversing piston is located in the groove and is in sliding connection with the groove.
Preferably, the upper retainer ring is arranged in the air compression part main body and positioned at the lower end of the exhaust valve cover, and the air compression reversing piston can penetrate through the upper retainer ring to move up and down in the upper retainer ring, so that the lower retainer ring can be in contact with the upper retainer ring.
In the above structure, in a normal state, the vent valve core and the vent valve cover are sealed, the booster plunger rod and the air pressure reversing piston are sealed, compressed air enters the inner cavity of the air pressure part main body through the hole in the air pressure part main body, and the air pressure reversing piston moves upwards together with the lower retainer ring under the action of air pressure, so that the upper retainer ring and the lower retainer ring are contacted and sealed.
Preferably, the exhaust valve seat and the exhaust valve core are assembled on the exhaust valve cover in a matching mode, a spring is arranged between the exhaust valve seat and the exhaust valve core, and the exhaust valve core and the exhaust valve cover are sealed to form a one-way valve.
Preferably, a through hole is formed in the middle of the exhaust valve cover, the exhaust valve seat is arranged at the upper end of the exhaust valve cover, the exhaust valve core is arranged on the exhaust valve seat in a sliding mode, and the lower end of the exhaust valve core is connected with the through hole in a sliding mode and can block and plug the through hole.
Preferably, an inner cavity penetrates through the middle of the air pressure reversing piston, and the upper end of the pressurizing plunger rod is located in the inner cavity and is in sliding connection with the inner cavity.
Preferably, the air compression part comprises an air compression pipe connected with the air compression part main body, an air compression piston is arranged in the air compression pipe in a sliding manner, the lower end of the pressurization plunger rod extends into the air compression pipe, and the air compression piston is fixed on the outer wall of the pressurization plunger rod;
the oil pressure part comprises an oil pressure part main body connected with the lower end of the air pressure pipe, and an air pressure piston return spring is connected between the air pressure piston and the oil pressure part main body.
When the air compression reversing valve works, compressed air enters an air compression pipe through an inner cavity of the air compression part main body, the air compression piston and the pressurization plunger rod are pushed to move downwards together, when the air compression reversing valve moves downwards to a set position, the upper end of the pressurization plunger rod is separated from the air compression reversing piston, the compressed air enters the air compression reversing piston through a gap between the pressurization plunger rod and the air compression reversing piston, at the moment, the air vent valve core and the air vent valve cover are in a sealing state, the air compression reversing piston can drive the lower retainer ring to move downwards together under the action of air pressure, the upper retainer ring is separated from the lower retainer ring, and the sealing state is relieved.
The air pressure piston loses air pressure, under the action of the piston return spring, the air pressure piston drives the pressurizing plunger rod to move upwards together, meanwhile, compressed air on the air pressure piston can pass through the inner cavity of the air pressure part main body and then is discharged into the air pressure upper cover through a gap between the upper retainer ring and the lower retainer ring, and then is discharged to the outside through wool felt inside the air pressure upper cover, and noise generated when the compressed air is discharged can be reduced through the wool felt.
When the air pressure piston and the pressurization plunger rod move upwards to a set position together, the pressurization plunger rod contacts with the air pressure reversing piston to form sealing, the upper end of the pressurization plunger rod contacts with the exhaust valve core to jack the exhaust valve core from the through hole, the sealing of the exhaust valve core and the exhaust valve cover is released, and compressed air in the air pressure reversing piston is discharged into the air pressure upper cover and is discharged to the outside through wool felt.
The air pressure piston and the pressurization plunger rod are restored to the initial positions, and the air pressure reversing piston and the lower retainer ring move upwards to restore to the initial positions to complete a stroke due to the fact that pressure inside the air pressure reversing piston is lost; at this time, the upper retainer ring and the lower retainer ring are sealed in a contact manner, the lower retainer ring and the air pressure part main body are separated from each other to remove the seal, and the booster plunger rod and the air pressure reversing piston are sealed.
Compressed air enters the inner cavity of the air compression part main body from the hole in the air compression part main body to push the air compression piston and the pressurization plunger rod to move downwards, and the steps are repeated to realize the reciprocating motion of the air compression piston and the pressurization plunger rod.
Preferably, a copper sleeve is arranged in the oil pressure part main body, and the pressurizing plunger rod extends into the oil pressure part main body and is in sliding connection with the oil pressure part main body.
Preferably, an oil inlet valve body and an oil outlet valve body are respectively arranged below and on the side face of the oil pressure part main body, the oil inlet valve body and the oil outlet valve body are of hollow structures, and the oil inlet valve body and the oil outlet valve body are communicated with an inner cavity of the oil pressure part main body to form an oil passage.
Preferably, the oil inlet valve body and the oil outlet valve body are assembled with the oil pressing part main body through threads respectively; the oil inlet check valve is installed at one end, connected with the oil pressure part main body, in the oil inlet valve body, and the oil outlet check valve is installed at one end, connected with the oil pressure part main body, in the oil outlet valve body.
When the pressurization plunger rod moves downwards during specific work, the oil inlet one-way valve is in a sealed state, the oil outlet one-way valve is opened, and hydraulic oil is pressed out through the oil outlet one-way valve and the oil outlet valve body; when the pressurizing plunger rod moves upwards, the oil inlet one-way valve is opened, the oil outlet one-way valve is in a sealed state, hydraulic oil filters impurities through the filter screen and enters the cavity of the oil pressure part main body through the oil suction pipe, and when the pressurizing plunger rod moves downwards, the actions are repeated to press out the hydraulic oil to finish one-time pressing.
(III) advantageous effects
The utility model provides a pneumatic booster pump hydraulic unit wherein improves the inside structure of pneumatics splenium main part, has effectively promoted the motion frequency of pneumatics piston for the holistic play oil of device and oil return speed promote greatly, compact structure moreover, work is steady, makes the part participate in gas simultaneously and gets rid of through silencing device, avoids popping one's voice, has reduced the noise.
Drawings
Fig. 1 is a schematic view of the overall cross-sectional structure of the present invention.
Wherein: the hydraulic control valve comprises a main body of a pneumatic part 1, an upper cover of the pneumatic part 11, an exhaust valve seat 12, an exhaust valve cover 13, a groove 13a, a through hole 13b, an exhaust valve core 14, a reversing piston of the pneumatic part 15, a sealing ring 15a, an inner cavity of the pneumatic part 15b, an upper retaining ring 16, a lower retaining ring 17, a pressurizing plunger rod 18, a pneumatic part 2, a pneumatic pipe 21, a pneumatic piston 22, a piston return spring of the pneumatic piston 23, an oil pressure part 3, a main body of an oil pressure part 31, a copper sleeve 32, an oil inlet valve body 33, an oil outlet valve body 34, an oil inlet check valve 35 and an oil outlet check valve 36.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the hydraulic unit of the pneumatic booster pump comprises an air pressing part main body 1, wherein an air pressing upper cover 11 is arranged on the air pressing part main body 1, and a wool felt is arranged inside the air pressing upper cover 11; an exhaust valve seat 12 and an exhaust valve cover 13 are arranged in the upper end of the air compression part main body 1, an exhaust valve core 14 is movably arranged in the exhaust valve seat 12, and the exhaust valve seat 12 is matched with the exhaust valve core 14 and is arranged on the exhaust valve cover 13;
an air pressure reversing piston 15 is movably arranged at the lower end of the exhaust valve cover 13, an upper retainer ring 16 matched with the air pressure reversing piston 15 is arranged at a position, close to the air pressure reversing piston 15, in the air pressure part main body 1, a lower retainer ring 17 is arranged at the lower end of the upper retainer ring 16 on the outer wall of the air pressure reversing piston 15, and a pressurizing plunger rod 18 is movably connected in the air pressure reversing piston 15;
the lower end of the air pressing part main body 1 is sequentially provided with an air pressing part 2 and an oil pressure part 3, and the pressurizing plunger rod 18 is matched with the air pressing part 2 and the oil pressure part 3 to work.
The lower end of the exhaust valve cover 13 is provided with a groove 13 a;
and a sealing ring 15a is sleeved on the outer wall of the upper end of the air compression reversing piston 15, and the air compression reversing piston 15 is positioned in the groove 13a and is in sliding connection with the groove 13 a.
The upper retainer ring 16 is arranged in the air pressure part main body 1 and positioned at the lower end of the exhaust valve cover 13, and the air pressure reversing piston 15 can penetrate through the upper retainer ring 16 to move up and down in the upper retainer ring 16, so that the lower retainer ring 17 can be in contact with the upper retainer ring 16.
In the above structure, in a normal state, the vent valve core 14 and the vent valve cover 13 are sealed, the pressurizing plunger rod 18 and the air pressure reversing piston 15 are sealed, compressed air enters the inner cavity 15b of the air pressure part main body 1 through the hole in the air pressure part main body 1, and the air pressure reversing piston 15 moves upward together with the lower retainer ring 17 due to the action of air pressure, so that the upper retainer ring 16 and the lower retainer ring 17 are contacted and sealed.
The exhaust valve seat 12 and the exhaust valve core 14 are assembled on the exhaust valve cover 13 in a matching mode, a spring is arranged between the exhaust valve seat 12 and the exhaust valve core 14, and the exhaust valve core 14 and the exhaust valve cover 13 are sealed to form a one-way valve.
The middle of the exhaust valve cover 13 is provided with a through hole 13b, the exhaust valve seat 12 is arranged at the upper end of the exhaust valve cover 13, the exhaust valve core 14 is arranged on the exhaust valve seat 12 in a sliding manner, and the lower end of the exhaust valve core 14 is connected with the through hole 13b in a sliding manner and can block and plug the through hole 13 b.
An inner cavity 15b is arranged in the middle of the air pressure reversing piston 15 in a penetrating mode, and the upper end of the pressurizing plunger rod 18 is located in the inner cavity 15b and is connected with the inner cavity 15b in a sliding mode.
The air compression part 2 comprises an air compression pipe 21 connected with the air compression part main body 1, an air compression piston 22 is arranged in the air compression pipe 21 in a sliding mode, the lower end of the pressurization plunger rod 18 extends into the air compression pipe 21, and the air compression piston 22 is fixed on the outer wall of the pressurization plunger rod 18;
the hydraulic unit 3 includes a hydraulic unit body 31 connected to a lower end of the air pressure pipe 21, and an air pressure piston return spring 23 is connected between the air pressure piston 22 and the hydraulic unit body 31.
During specific work, compressed air enters the air pressure pipe 21 through the inner cavity 15b of the air pressure part main body 1, the air pressure piston 22 and the pressurization plunger rod 18 are pushed to move downwards together, when the compressed air moves downwards to a set position, the upper end of the pressurization plunger rod 18 is separated from the air pressure reversing piston 15, the compressed air enters the air pressure reversing piston 15 through a gap between the pressurization plunger rod 18 and the air pressure reversing piston 15, at the moment, the air exhaust valve core 14 and the air exhaust valve cover 13 are in a sealing state, so that the air pressure reversing piston 15 drives the lower retainer ring 17 to move downwards together under the action of air pressure, the upper retainer ring 16 is separated from the lower retainer ring 17, and the sealing state is released.
Under the action of air pressure, the air pressure reversing piston 15 and the lower retainer 17, the lower retainer 17 is matched with the air pressure part main body 1 to form sealing, and compressed air cannot enter the air pressure pipe 21 again.
The air pressure of the air pressure piston 22 is lost, the air pressure piston 22 drives the booster plunger rod 18 to move upwards together under the action of the piston return spring, meanwhile, compressed air on the air pressure piston 22 can pass through the inner cavity 15b of the air pressure part main body 1 and then is discharged into the air pressure upper cover 11 through a gap between the upper retainer ring 16 and the lower retainer ring 17, and then is discharged to the outside through wool felt inside the air pressure upper cover 11, and noise generated when the compressed air is discharged can be reduced through the wool felt.
When the air pressure piston 22 moves upwards to a set position together with the pressurization plunger rod 18, the pressurization plunger rod 18 contacts with the air pressure reversing piston 15 to form a seal, the upper end of the pressurization plunger rod 18 contacts with the vent valve core 14 to jack the vent valve core 14 from the through hole 13b, the seal between the vent valve core 14 and the vent valve cover 13 is released, and compressed air in the air pressure reversing piston 15 is discharged into the air pressure upper cover 11 and is discharged to the outside through wool felt.
The air pressure piston 22 and the pressurizing plunger rod 18 are restored to the initial positions, and because the pressure inside the air pressure reversing piston 15 is lost, the air pressure reversing piston 15 and the lower retainer ring 17 move upwards to be restored to the initial positions, and a stroke is completed; at this time, the upper retainer 16 and the lower retainer 17 are in contact with each other and sealed, the lower retainer 17 and the air pressure unit main body 1 are separated from each other and released from the seal, and the pressurizing plunger rod 18 and the air pressure direction changing piston 15 are sealed.
Compressed air enters the inner cavity 15b of the air pressing part main body 1 from the hole on the air pressing part main body 1, the air pressing piston 22 and the pressurizing plunger rod 18 are pushed to move downwards, and the steps are repeated to realize the reciprocating motion of the air pressing piston 22 and the pressurizing plunger rod 18.
A copper sleeve 32 is arranged in the oil pressure part main body 31, and the pressurizing plunger rod 18 extends into the oil pressure part main body 31 and is connected with the oil pressure part main body 31 in a sliding manner.
The lower surface and the side surface of the oil pressure part main body 31 are respectively provided with an oil inlet valve body 33 and an oil outlet valve body 34, the oil inlet valve body 33 and the oil outlet valve body 34 are of hollow structures, and the oil inlet valve body 33 and the oil outlet valve body 34 are communicated with the inner cavity of the oil pressure part main body 31 to form an oil passage.
The oil inlet valve body 33 and the oil outlet valve body 34 are assembled to the hydraulic unit main body 31 by a screw; an oil inlet check valve 35 is installed at one end of the oil inlet valve body 33 connected to the oil pressure portion main body 31, and an oil outlet check valve 36 is installed at one end of the oil outlet valve body 34 connected to the oil pressure portion main body 31.
Specifically, go into oily valve body 33 lower extreme and installed the filter screen in proper order, whole hydraulic unit can judge whether install the mounting panel according to the difference of mounted position and environment and demand.
During specific work, when the pressurizing plunger rod 18 moves downwards, the oil inlet check valve 35 is in a sealed state, the oil outlet check valve 36 is opened, and hydraulic oil is pressed out through the oil outlet check valve 36 and the oil outlet valve body 34; when the pressurizing plunger rod 18 moves upwards, the oil inlet check valve 35 is opened, the oil outlet check valve 36 is in a sealed state, hydraulic oil filters impurities through a filter screen and enters the cavity of the oil pressure part main body 31 through the oil suction pipe, and when the pressurizing plunger rod 18 moves downwards, the actions are repeated to press out the hydraulic oil to finish one-time pressing.
The utility model discloses the structure of well hollow pressing portion main part 1 inside improves, has effectively promoted the motion frequency of air compressor piston 22 for the holistic play oil of device and oil return speed promote greatly, compact structure moreover, and work is steady, makes the part participate in simultaneously gaseous getting rid of through silencing device, avoids popping one's voice, has reduced the noise.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The hydraulic unit of the pneumatic booster pump is characterized by comprising an air pressing part main body (1), wherein an air pressing upper cover (11) is arranged on the air pressing part main body (1), and a wool felt is arranged in the air pressing upper cover (11); an exhaust valve seat (12) and an exhaust valve cover (13) are arranged inside the upper end of the air compression part main body (1), an exhaust valve core (14) is movably arranged in the exhaust valve seat (12), and the exhaust valve seat (12) is matched with the exhaust valve core (14) and arranged on the exhaust valve cover (13);
an air pressure reversing piston (15) is movably arranged at the lower end of the exhaust valve cover (13), an upper check ring (16) matched with the air pressure reversing piston (15) is arranged at a position, close to the air pressure reversing piston (15), in the air pressure part main body (1), a lower check ring (17) is arranged at the lower end, located at the upper check ring (16), of the outer wall of the air pressure reversing piston (15), and a pressurizing plunger rod (18) is movably connected in the air pressure reversing piston (15);
the lower end of the air compression part main body (1) is sequentially provided with an air compression part (2) and an oil pressure part (3), and the pressurization plunger rod (18) is matched with the air compression part (2) and the oil pressure part (3) for work.
2. The pneumatic booster pump hydraulic unit of claim 1, wherein: the lower end of the exhaust valve cover (13) is provided with a groove (13 a);
and the outer wall of the upper end of the air compression reversing piston (15) is sleeved with a sealing ring (15a), and the air compression reversing piston (15) is positioned in the groove (13a) and is in sliding connection with the groove (13 a).
3. The pneumatic booster pump hydraulic unit of claim 1, wherein: the upper retainer ring (16) is arranged in the air compression part main body (1) and is positioned at the lower end of the exhaust valve cover (13), and the air compression reversing piston (15) can penetrate through the upper retainer ring (16) to move up and down in the upper retainer ring (16), so that the lower retainer ring (17) can be in contact with the upper retainer ring (16).
4. The pneumatic booster pump hydraulic unit of claim 1, wherein: the exhaust valve seat (12) and the exhaust valve core (14) are assembled on the exhaust valve cover (13) in a matching mode, a spring is arranged between the exhaust valve seat (12) and the exhaust valve core (14), and the exhaust valve core (14) and the exhaust valve cover (13) are sealed to form a one-way valve.
5. The pneumatic booster pump hydraulic unit of claim 4, wherein: the middle of the exhaust valve cover (13) is provided with a through hole (13b), the exhaust valve seat (12) is arranged at the upper end of the exhaust valve cover (13), the exhaust valve core (14) is arranged on the exhaust valve seat (12) in a sliding mode, and the lower end of the exhaust valve core (14) is connected with the through hole (13b) in a sliding mode and can be blocked and plugged by the through hole (13 b).
6. The pneumatic booster pump hydraulic unit of claim 1, wherein: an inner cavity (15b) penetrates through the middle of the air pressure reversing piston (15), and the upper end of the pressurizing plunger rod (18) is located in the inner cavity (15b) and is in sliding connection with the inner cavity (15 b).
7. The pneumatic booster pump hydraulic unit of claim 1, wherein: the air compression part (2) comprises an air compression pipe (21) connected with the air compression part main body (1), an air compression piston (22) is arranged in the air compression pipe (21) in a sliding mode, the lower end of the pressurization plunger rod (18) extends into the air compression pipe (21), and the air compression piston (22) is fixed on the outer wall of the pressurization plunger rod (18);
the hydraulic component (3) comprises a hydraulic part main body (31) connected with the lower end of the air pressure pipe (21), and an air pressure piston return spring (23) is connected between the air pressure piston (22) and the hydraulic part main body (31).
8. The pneumatic booster pump hydraulic unit of claim 7, wherein: be provided with copper sheathing (32) in oil pressure portion main part (31), pressure boost plunger rod (18) stretch into in oil pressure portion main part (31) and with oil pressure portion main part (31) sliding connection.
9. The pneumatic booster pump hydraulic unit of claim 7, wherein: the oil pressure part is characterized in that an oil inlet valve body (33) and an oil outlet valve body (34) are respectively arranged below and on the side face of the oil pressure part main body (31), the oil inlet valve body (33) and the oil outlet valve body (34) are of a hollow structure, and the oil inlet valve body (33) and the oil outlet valve body (34) are communicated with an inner cavity of the oil pressure part main body (31) to form an oil path channel.
10. The pneumatic booster pump hydraulic unit of claim 9, wherein: the oil inlet valve body (33) and the oil outlet valve body (34) are assembled with the oil pressure part main body (31) through threads respectively; go into in oily valve body (33) with oil pressure portion main part (31) one end that is connected installs into oily check valve (35), go out oily check valve (36) are installed to the one end that is connected with oil pressure portion main part (31) in going out oily valve body (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220249217.6U CN217462449U (en) | 2022-01-30 | 2022-01-30 | Hydraulic unit of pneumatic booster pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220249217.6U CN217462449U (en) | 2022-01-30 | 2022-01-30 | Hydraulic unit of pneumatic booster pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217462449U true CN217462449U (en) | 2022-09-20 |
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ID=83262873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220249217.6U Active CN217462449U (en) | 2022-01-30 | 2022-01-30 | Hydraulic unit of pneumatic booster pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217462449U (en) |
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2022
- 2022-01-30 CN CN202220249217.6U patent/CN217462449U/en active Active
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