CN220168432U - Hydro-pneumatic spring and vehicle suspension system - Google Patents
Hydro-pneumatic spring and vehicle suspension system Download PDFInfo
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- CN220168432U CN220168432U CN202321581187.XU CN202321581187U CN220168432U CN 220168432 U CN220168432 U CN 220168432U CN 202321581187 U CN202321581187 U CN 202321581187U CN 220168432 U CN220168432 U CN 220168432U
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- 239000000725 suspension Substances 0.000 title claims abstract description 19
- 238000013016 damping Methods 0.000 claims abstract description 52
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 5
- 230000005489 elastic deformation Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of hydraulic machinery, and particularly discloses a hydro-pneumatic spring and a vehicle suspension system, wherein a cavity A is arranged in a first cylinder barrel of the hydro-pneumatic spring 1 And the cavity B is a hollow structure in the piston rod, the hollow structure comprises a cavity C and a cavity D, the piston is provided with a compensation runner which is respectively communicated with the cavity C and the cavity B, and the cavity A is provided with a compensation runner which is respectively communicated with the cavity C and the cavity B 1 Damping oil is filled in the cavity C, and the cavity D is filled withThe damper is provided with a plurality of damping holes, and two ends of the hydraulic flow passage are respectively communicated with the damper and the cavity A 1 The damper is communicated with the energy accumulator. The piston can be caused to move up and down in the first cylinder barrel when the vehicle is on uneven road surface, and the cavity A is under the action of pressure difference 1 The damping oil flows through a plurality of damping holes of the damper, heat is generated by a small-hole throttling principle to consume energy, vibration of the vehicle is damped, load is borne by elastic deformation of gas, the rigidity of a vehicle suspension system can be adjusted in real time, and the damping performance is excellent.
Description
Technical Field
The utility model relates to the technical field of hydraulic machinery, in particular to a hydro-pneumatic spring and a vehicle suspension system.
Background
The suspension system is one of the important assemblies of motor vehicles, the existing suspension usually adopts a structural form of a leaf spring and cylinder type shock absorber, an elastic element and a damping element of the existing suspension are separated, the elastic characteristic of the elastic element is nearly linear, the rigidity is almost unchanged, when the motor vehicle runs on an uneven road surface, the impact from the road surface is very large, the vehicle body vibrates violently, the suspension is required to have enough rigidity to absorb vibration energy, the spring rigidity is too small at the moment, the vibration energy absorption is not large, the buffering performance is too poor, the phenomenon of impact limit often occurs, and therefore, the existing suspension cannot meet the requirements of people on the running smoothness and riding comfort of the vehicle under the working conditions such as the change of the vehicle body quality.
Thus, there is a need for a hydro-pneumatic spring to address the above-described problems.
Disclosure of Invention
The utility model aims to provide a hydro-pneumatic spring and a vehicle suspension system, which have nonlinear rigidity-changing characteristics and good damping characteristics, can adjust the rigidity of the vehicle suspension system in real time, have excellent vibration damping performance and have smoothness and comfortableness.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in one aspect, the present utility model provides a hydro-pneumatic spring comprising:
the hydraulic cylinder comprises a first cylinder barrel, wherein a first cavity is arranged in the first cylinder barrel, and a hydraulic flow passage is arranged on the side wall of the first cylinder barrel;
the piston comprises a first piston sleeve and a piston rod connected with the first piston sleeve, wherein the first piston sleeve is in sliding connection with the inner wall of the first cavity and divides the first cavity into a cavity A 1 And cavity A 2 The piston rod part is positioned in the cavity A 2 In, the cavity A 2 An annular boss is arranged on the inner wall of the piston rod in a protruding way, the annular boss is in sliding connection with the piston rod, and the periphery of the piston rod is connected with the cavity A 2 The side walls of the piston rod are arranged at intervals to form a cavity B, and a second cavity is arranged inside the piston rod;
the second piston sleeve is arranged on the inner wall of the second cavity in a sliding manner and divides the second cavity into a cavity C and a cavity D, the piston is provided with a compensation flow passage which is respectively communicated with the cavity C and the cavity B, and the cavity A is provided with a compensation flow passage which is respectively communicated with the cavity C and the cavity D 1 Damping oil is filled in the cavity C, and gas is filled in the cavity D;
the hydraulic flow passage is characterized by comprising a damper and an energy accumulator, wherein a plurality of damping holes are formed in the damper, and two ends of the hydraulic flow passage are respectively communicated with the damper and the cavity A 1 The damper is communicated with the energy accumulator.
Wherein the energy storage device comprises:
the second cylinder barrel is internally provided with a third cavity;
the third piston sleeve is arranged on the inner wall of the third cavity in a sliding manner, the third cavity is divided into a cavity E and a cavity F, the damper is communicated with the cavity E, and damping oil liquid and gas are respectively filled in the cavity E and the cavity F.
The top end of the cavity E is provided with an oil adding port, the oil adding port is provided with an oil valve, and the oil valve is used for opening or closing the oil adding port.
Wherein the damper can realize three-stage damping adjustment, and is internally provided with a compression valve and a recovery valve, and the compression valve is configured to only allow damping oil to flow from the cavity A 1 Toward the cavity E, the reset valve is configured toAllowing only damping oil to flow from the cavity E to the cavity A 1 。
The bottom end of the piston rod is provided with an air passage communicated with the cavity D, and the air passage is provided with a gas valve used for opening or closing the air passage.
The piston rod is sleeved with a dust cover, and the dust cover is fixedly connected with the first cylinder barrel and is positioned outside the first cylinder barrel.
The bottom end of the first cylinder barrel is provided with a displacement sensor, and the displacement sensor is used for detecting the position of the piston rod.
Wherein the first cylinder barrel is provided with an oil pressure sensor for detecting the cavity A 1 Internal oil pressure.
Wherein the first cylinder barrel is also provided with a temperature sensor for detecting the cavity A 1 Internal temperature.
On the other hand, the utility model also provides a vehicle suspension system, which comprises an axle, wherein the vehicle suspension system further comprises the hydro-pneumatic spring in any scheme, the piston rod is connected to the axle, and the first cylinder barrel is used for being connected with a chassis.
The beneficial effects of the utility model are as follows:
the utility model provides a hydro-pneumatic spring and a vehicle suspension system, the hydro-pneumatic spring comprises a first cylinder barrel, a piston, a second piston sleeve, a damper and an energy accumulator, wherein a first cavity is arranged in the first cylinder barrel, a hydraulic flow passage is arranged on the side wall of the first cylinder barrel, the piston comprises the first piston sleeve and a piston rod connected with the first piston sleeve, the first piston sleeve is in sliding connection with the inner wall of the first cavity, and separates the first cavity into a cavity A 1 And cavity A 2 The piston rod part is positioned in the cavity A 2 In, cavity A 2 An annular boss is convexly arranged on the inner wall of the piston rod, the annular boss is in sliding connection with the piston rod, and the periphery of the piston rod is connected with the cavity A 2 The side walls of the piston rod are arranged at intervals to form a cavity B, a second cavity is arranged in the piston rod, a second piston sleeve is arranged on the inner wall of the second cavity in a sliding way,and the second cavity is divided into a cavity C and a cavity D, the piston is provided with a compensation runner which is respectively communicated with the cavity C and the cavity B, and the cavity A 1 Damping oil liquid is filled in the cavity C, gas is filled in the cavity D, a plurality of damping holes are formed in the damper, and two ends of the hydraulic flow passage are respectively communicated with the damper and the cavity A 1 The damper is communicated with the energy accumulator. So arranged, when the vehicle is in a driving state, uneven road surface can cause the piston to move up and down in the first cylinder barrel, and the cavity A is caused by the pressure difference 1 The damping oil flows through a plurality of damping holes of the damper, heat is generated by a damping hole throttling principle to consume energy, vibration of a vehicle is attenuated, meanwhile, due to the existence of a compensation runner, the balance of the upper pressure and the lower pressure of a piston can be guaranteed, the load born by the vehicle is borne by elastic deformation of gas, and the ground impact is lightened, so that the hydro-pneumatic spring has nonlinear rigidity-variable characteristics and good damping characteristics, the rigidity of a vehicle suspension system can be adjusted in real time, the vibration reduction performance is excellent, and smoothness and comfortableness are both considered.
Drawings
Fig. 1 is a schematic structural diagram of a hydro-pneumatic spring provided by the utility model.
Wherein:
1. a first cylinder; 101. a hydraulic flow passage; 2. a first piston sleeve; 3. compensating the flow channel; 4. a piston rod; 5. a second piston sleeve; 6. an annular boss; 7. a damper; 8. a second cylinder; 9. a third piston sleeve; 10. an oil liquid inlet; 11. an airway; 12. a dust cover; 13. a displacement sensor.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides a hydro-pneumatic spring comprising a first cylinder 1, a piston, a first cylinderThe two piston sleeves 5, the damper 7 and the energy accumulator, a first cavity is arranged in the first cylinder barrel 1, a hydraulic flow passage 101 is arranged on the side wall of the first cylinder barrel 1, the piston comprises a first piston sleeve 2 and a piston rod 4 connected with the first piston sleeve 2, the first piston sleeve 2 is in sliding connection with the inner wall of the first cavity, and the first cavity is divided into a cavity A 1 And cavity A 2 The piston rod 4 is partially positioned in the cavity A 2 In, cavity A 2 An annular boss 6 is arranged on the inner wall of the piston rod 4 in a protruding way, the annular boss 6 is connected with the piston rod 4 in a sliding way, and the periphery of the piston rod 4 is connected with the cavity A 2 Is arranged at intervals and forms a cavity B, a second cavity is arranged in the piston rod 4, a second piston sleeve 5 is arranged on the inner wall of the second cavity in a sliding way, the second cavity is divided into a cavity C and a cavity D, a compensation runner 3 which is respectively communicated with the cavity C and the cavity B is arranged on the piston, and a cavity A is arranged on the piston 1 Damping oil liquid is filled in the cavity C, gas is filled in the cavity D, a plurality of damping holes are formed in the damper 7, and two ends of the hydraulic flow passage 101 are respectively communicated with the damper 7 and the cavity A 1 The damper 7 communicates with the accumulator. So arranged, when the vehicle is in a driving state, uneven road surface can cause the piston to move up and down in the first cylinder 1, and under the action of pressure difference, the cavity A 1 The damping oil flows through a plurality of damping holes of the damper 7, heat is generated by a damping hole throttling principle to consume energy, vibration of a vehicle is damped, meanwhile, due to the existence of the compensation runner 3, the balance of the upper pressure and the lower pressure of the piston can be guaranteed, the load born by the vehicle is borne by elastic deformation of gas in the cavity D, the ground impact is lightened, and the hydro-pneumatic spring has excellent nonlinear stiffness characteristic and nonlinear damping characteristic, excellent vibration damping performance and both smoothness and comfort.
Further, the energy accumulator comprises a second cylinder barrel 8 and a third piston sleeve 9, a third cavity is arranged in the second cylinder barrel 8, the third piston sleeve 9 is slidably arranged on the inner wall of the third cavity, the third cavity is divided into a cavity E and a cavity F, the damper 7 is communicated with the cavity E, and damping oil liquid and gas are respectively filled in the cavity E and the cavity F. In the present embodiment, the gas filled in the chambers D and F is high pressure nitrogen, so arranged that when the road surface is uneven, the piston is in the first cylinder 1When moving up and down, under the action of pressure difference, cavity E and cavity A 1 The damping oil flows through a plurality of damping holes of the damper 7, heat is generated by a damping hole throttling principle to consume energy, the damping characteristic of the hydro-pneumatic spring is formed, the load born by the vehicle is borne by the elastic deformation of high-pressure nitrogen in the cavity D and the cavity F, and the elastic characteristic of the hydro-pneumatic spring is formed. In the present embodiment, the first piston sleeve 2, the second piston sleeve 5 and the third piston sleeve 9 are all floating piston sleeves.
In the present embodiment, the first cylinder tube 1 and the second cylinder tube 8 are disposed at intervals in the radial direction of the first cylinder tube 1. In other embodiments, the accumulator may also be arranged on the same axis as the first cylinder 1, and the second cylinder 8 is fixedly connected to the first cylinder 1.
Optionally, in order to replace or add damping oil into the cavity E in time, an oil inlet 10 is provided at the top end of the cavity E, and an oil valve is provided at the oil inlet 10, and is used for opening or closing the oil inlet 10.
Optionally, in order to adapt the damping variation of the vehicle to the impact of different road surfaces, the damper 7 can be three-stage damping adjustable, and is internally provided with a compression valve and a rebound valve, the compression valve being configured to allow only damping oil to pass from the cavity a 1 To the cavity E, the reset valve is configured to only allow damping oil to flow from the cavity E to the cavity A 1 。
Optionally, in order to timely supplement gas into the cavity D, the bottom end of the piston rod 4 is provided with an air passage 11 communicated with the cavity D, and the air passage 11 is provided with a gas valve for opening or closing the air passage 11.
Optionally, in order to prevent external dust and other particulate matters from entering the first cylinder 1, the piston rod 4 is sleeved with a dust cover 12, and the dust cover 12 is fixedly connected with the first cylinder 1 and is located outside the first cylinder 1.
Optionally, the bottom end of the first cylinder 1 is provided with a displacement sensor 13, the displacement sensor 13 being adapted to detect the position of the piston rod 4. Specifically, the displacement sensor 13 is a magneto-resistive displacement sensor 13, magnetic and non-magnetic materials are plated on the periphery of the piston rod 4 at equal intervals, and the magneto-resistive displacement sensor 13 is used for measuring the magnetic field change generated by the movement of the piston at the bottom of the first cylinder 1, so that accurate piston displacement data is obtained through processing.
Optionally, the first cylinder 1 is provided with an oil pressure sensor for detecting the cavity a 1 Internal oil pressure. Further, the first cylinder 1 is further provided with a temperature sensor for detecting the cavity a 1 Internal temperature. In this embodiment, the oil pressure sensor and the oil pressure sensor are both disposed on the top of the first cylinder 1 by screw connection.
The working principle of the hydro-pneumatic spring is as follows:
when the vehicle is in a running state, the road surface unevenness causes the piston to move up and down in the first cylinder tube 1, thereby forming a compression stroke and a recovery stroke.
When the hydro-pneumatic spring is in the compression stroke, the piston moves upwards to compress the cavity A 1 Part of the damping oil in the damper flows through the damper 7 and enters the cavity E, at the moment, a compression valve in the damper 7 is opened, and a recovery valve is closed, so that the third piston sleeve 9 is pushed to compress the gas in the cavity F. Meanwhile, under the action of high-pressure gas in the cavity D, the second piston sleeve 5 is pushed to move upwards, and part of damping oil in the compression cavity C enters the cavity B through the compensation runner 3 so as to compensate the volume of the cavity B after the piston moves upwards.
In the compression stroke, the elastic rigidity is mainly provided by the compressed high-pressure gas in the cavity F; the damping force is provided by the damping hole throttling principle of the damping hole in the damper 7, and the throttling effect of the compensation flow channel 3 can be ignored due to the large caliber of the compensation flow channel.
When the hydro-pneumatic spring is in the restoring stroke, the piston moves downwards, part of damping oil in the compression cavity B enters the cavity C through the compensation flow channel 3, so that the second piston sleeve 5 is pushed to move downwards, and gas in the cavity D is compressed. Meanwhile, under the action of high-pressure gas in the cavity F, the third piston sleeve 9 is pushed to move upwards, and part of damping oil in the compression cavity E enters the cavity A through the damper 7 1 At this time, the restoring valve in the damper 7 is opened and the compression valve is closed to compensate for the cavity A after the piston moves down 1 The volume that is vacated.
In the restoring stroke, the elastic rigidity is mainly provided by the compressed high-pressure gas in the cavity D, the damping force is provided by the damping hole throttling principle of the damping hole in the damper 7, and the throttling effect of the compensation flow channel 3 can be ignored because of the large caliber of the compensation flow channel.
The embodiment also provides a vehicle suspension system, which comprises an axle, the vehicle suspension system further comprises the hydro-pneumatic spring in any scheme, the piston rod 4 is connected to the axle, and the first cylinder barrel 1 is used for connecting a chassis.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. A hydro-pneumatic spring, comprising:
the hydraulic cylinder comprises a first cylinder barrel (1), wherein a first cavity is arranged in the first cylinder barrel (1), and a hydraulic flow passage (101) is arranged on the side wall of the first cylinder barrel (1);
the piston comprises a first piston sleeve (2) and a piston rod (4) connected with the first piston sleeve (2), wherein the first piston sleeve (2) is in sliding connection with the inner wall of the first cavity and divides the first cavity into a cavity A 1 And cavity A 2 The piston rod (4) is partially positioned in the cavity A 2 In, the cavity A 2 An annular boss (6) is arranged on the inner wall of the piston rod (4) in a protruding mode, the annular boss (6) is connected with the piston rod (4) in a sliding mode, and the periphery of the piston rod (4) is connected with the cavity A 2 The side walls of the piston rod (4) are arranged at intervals to form a cavity B, and a second cavity is arranged inside the piston rod;
a second piston sleeve (5) which is arranged on the inner wall of the second cavity in a sliding way and divides the second cavity into a cavity C and a cavity D, and the piston is provided withHas a compensation flow passage (3) respectively communicated with the cavity C and the cavity B, the cavity A 1 Damping oil is filled in the cavity C, and gas is filled in the cavity D;
the hydraulic flow passage (101) is characterized by comprising a damper (7) and an energy accumulator, wherein a plurality of damping holes are formed in the damper (7), and two ends of the hydraulic flow passage (101) are respectively communicated with the damper (7) and the cavity A 1 The damper (7) is in communication with the accumulator.
2. The hydro-pneumatic spring of claim 1 wherein the accumulator comprises:
the second cylinder (8) is internally provided with a third cavity;
the third piston sleeve (9) is arranged on the inner wall of the third cavity in a sliding manner, the third cavity is divided into a cavity E and a cavity F, the damper (7) is communicated with the cavity E, and damping oil liquid and gas are respectively filled in the cavity E and the cavity F.
3. A gas spring according to claim 2, characterized in that the top end of the cavity E is provided with an oil feed port (10), the oil feed port (10) being provided with an oil valve for opening or closing the oil feed port (10).
4. A hydro-pneumatic spring as claimed in claim 2, wherein the damper (7) is three-stage damping-adjustable and internally provided with a compression valve configured to allow only damping oil from the cavity a and a return valve 1 To the cavity E, the recovery valve is configured to only allow damping oil to flow from the cavity E to the cavity A 1 。
5. A hydro-pneumatic spring as claimed in claim 1 wherein the bottom end of the piston rod (4) is provided with an air passage (11) in communication with the cavity D, the air passage (11) being provided with a gas valve for opening or closing the air passage (11).
6. A hydro-pneumatic spring as defined in any one of claims 1-5 wherein a dust cap (12) is provided over the piston rod (4), the dust cap (12) being fixedly connected to the first cylinder (1) and being located outside the first cylinder (1).
7. A hydro-pneumatic spring as defined in any one of claims 1-5 wherein the bottom end of the first cylinder (1) is provided with a displacement sensor (13), the displacement sensor (13) being adapted to detect the position of the piston rod (4).
8. A hydro-pneumatic spring as defined by any one of claims 1-5 wherein the first cylinder (1) is provided with an oil pressure sensor for detecting the cavity a 1 Internal oil pressure.
9. Hydro-pneumatic spring according to claim 8, characterized in that the first cylinder (1) is also provided with a temperature sensor for detecting the cavity a 1 Internal temperature.
10. Vehicle suspension system comprising an axle, characterized in that it further comprises a hydro-pneumatic spring according to any one of claims 1-9, to which the piston rod (4) is connected, the first cylinder (1) being intended for connection to a chassis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321581187.XU CN220168432U (en) | 2023-06-20 | 2023-06-20 | Hydro-pneumatic spring and vehicle suspension system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321581187.XU CN220168432U (en) | 2023-06-20 | 2023-06-20 | Hydro-pneumatic spring and vehicle suspension system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220168432U true CN220168432U (en) | 2023-12-12 |
Family
ID=89065418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321581187.XU Active CN220168432U (en) | 2023-06-20 | 2023-06-20 | Hydro-pneumatic spring and vehicle suspension system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220168432U (en) |
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2023
- 2023-06-20 CN CN202321581187.XU patent/CN220168432U/en active Active
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