CN218817813U - Hydraulic damper - Google Patents
Hydraulic damper Download PDFInfo
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- CN218817813U CN218817813U CN202222263532.7U CN202222263532U CN218817813U CN 218817813 U CN218817813 U CN 218817813U CN 202222263532 U CN202222263532 U CN 202222263532U CN 218817813 U CN218817813 U CN 218817813U
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- oil
- damping
- piston
- oil path
- hydraulic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model discloses a hydraulic damper, the damping component is arranged in the shell, the damping component comprises a piston, a piston sleeve and a damping rod, the piston is movably sleeved in the piston sleeve and forms a hydraulic oil upper cavity and a hydraulic oil lower cavity in the piston sleeve, the upper end of the damping rod is connected with the piston, and the lower end of the damping rod extends to the lower side of the shell and extends to the outside of the shell; the damping elastic mechanism is arranged in the hydraulic oil upper cavity, the upper end of the damping elastic mechanism is connected with the piston sleeve, and the lower end of the damping elastic mechanism is connected with the upper surface of the piston; the damping oil path and the release oil path are arranged in the shell, the input end of the damping oil path is communicated with the hydraulic oil upper cavity, and the output end of the damping oil path is communicated with the hydraulic oil lower cavity; the input end of the release oil path is communicated with the hydraulic oil lower cavity, and the output end of the release oil path is communicated with the hydraulic oil upper cavity. The hydraulic damper solves the problem that the existing damper can not realize slow opening and quick closing of the electromagnetic valve.
Description
Technical Field
The utility model relates to a attenuator field, in particular to hydraulic damper.
Background
The damper has the effects of providing damping, and different using environments have different effects, so that the effects of damping, shock resistance and movement speed reduction can be achieved. The application of the electromagnetic valve is more and more extensive, but the opening and closing time of the electromagnetic valve without the damper is short, the instantaneous opening can cause impact on a pipeline system, and if the gas system can generate larger explosion.
When the solenoid valve is closed, the closing speed cannot influence a pipeline system, after the existing damper acts on the solenoid valve, the solenoid valve needs to be buffered by the damper no matter opened or closed, so that the purposes of slow opening and quick closing of the solenoid valve cannot be realized, and when the solenoid valve is closed, the solenoid valve still needs to be buffered by the damper, so that the closing efficiency of the solenoid valve is low.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the utility model provides a hydraulic damper to solve the above-mentioned problem.
The utility model provides a technical scheme that its technical problem adopted is: a hydraulic damper comprises a shell, a damping component, a damping elastic mechanism, a damping oil path and a release oil path;
the damping assembly is arranged in the shell and comprises a piston, a piston sleeve and a damping rod, the piston is movably sleeved in the piston sleeve, a hydraulic oil upper cavity and a hydraulic oil lower cavity are formed in the piston sleeve, the upper end of the damping rod is connected with the piston, and the lower end of the damping rod extends to the lower side of the shell and extends to the outside of the shell; the damping elastic mechanism is arranged in the hydraulic oil upper cavity, the upper end of the damping elastic mechanism is connected with the piston sleeve, and the lower end of the damping elastic mechanism is connected with the upper surface of the piston;
the damping oil path and the release oil path are both arranged inside the shell, the input end of the damping oil path is communicated with the hydraulic oil upper cavity, and the output end of the damping oil path is communicated with the hydraulic oil lower cavity; the input end of the release oil path is communicated with the hydraulic oil lower cavity, and the output end of the release oil path is communicated with the hydraulic oil upper cavity.
It is worth to say that the damping assembly further comprises a one-way valve plate, and the release oil path is arranged on the piston and penetrates through the piston;
one end of the one-way valve plate is arranged at the output end of the release oil way, and the other end of the one-way valve plate is fixedly connected with the upper surface of the piston.
The hydraulic damper further comprises a flow passage adjusting block, the damping oil path comprises a first oil passage, a second oil passage and a third oil passage, the first oil passage is arranged on the flow passage adjusting block, the second oil passage is arranged on the piston sleeve, and a gap between the shell and the piston sleeve forms the third oil passage; the flow channel adjusting block is arranged on the piston sleeve and is rotationally connected with the piston sleeve, wherein the length direction of the first oil channel is perpendicular to a rotating shaft of the flow channel adjusting block;
the input end of the first oil duct is communicated with the hydraulic oil upper cavity, the output end of the first oil duct faces the second oil duct and is communicated with the second oil duct, the output end of the second oil duct is communicated with the input end of the third oil duct, and the output end of the third oil duct is communicated with the hydraulic oil lower cavity.
Preferably, the damping oil path further comprises a fourth oil path, the fourth oil path sequentially penetrates through the piston sleeve and the piston, an input end of the fourth oil path is communicated with an output end of the third oil path, and an output end of the fourth oil path is communicated with the hydraulic oil lower cavity.
Optionally, the damping assembly further comprises a rod guide sleeve, the upper end of the rod guide sleeve is connected with the piston, and the damping rod is sleeved in the rod guide sleeve; the lower end of the rod guide sleeve extends to the outside of the shell towards the lower side of the shell, and threads matched with the electromagnetic valve are arranged at the lower end of the rod guide sleeve.
It should be noted that the hydraulic damper further includes a bottom cover disposed at a lower side of the housing, the rod guide sleeve penetrates the bottom cover and then is connected to the piston, and the rod guide sleeve is slidably connected to the bottom cover.
Specifically, the outer wall of the rod guide sleeve is provided with a polygonal limiting portion, the bottom cover is provided with a polygonal through hole corresponding to the polygonal limiting portion, the rod guide sleeve penetrates through the polygonal through hole and then is connected with the piston, and the polygonal limiting portion is arranged in the polygonal through hole.
Optionally, a limiting groove is formed in the peripheral wall surface of the bottom cover, a limiting protruding portion is arranged on the lower side of the shell, the limiting groove corresponds to the limiting protruding portion, and the limiting protruding portion is arranged in the limiting groove.
Preferably, the side wall of the shell is provided with a fixing plate, and the fixing plate is of a C-shaped structure.
It is worth to say that the upper end of the flow channel adjusting block extends upwards to the outer side of the shell, and the upper end of the flow channel adjusting block is provided with scales for marking the corner position.
The beneficial effects of the utility model reside in that: in the hydraulic damper, after the solenoid valve is electrified, the valve core of the solenoid valve moves and contacts with the damping rod, the damping rod is jacked up, the acting force of the damping elastic mechanism is overcome to push the piston to move upwards, the volume of the hydraulic oil upper cavity is reduced, a part of hydraulic oil passes through the damping oil way and then enters the hydraulic oil lower cavity, and as the hydraulic oil flows through the damping oil way, a period of time is required, so that the action time of the valve core of the solenoid valve can be prolonged, and the solenoid valve is slowly opened. When the electromagnetic valve is powered off, the valve core of the electromagnetic valve retracts, the damping rod cannot block the valve core of the electromagnetic valve to move, the action time of the valve core of the electromagnetic valve is the rated action time of the electromagnetic valve, so that the electromagnetic valve is quickly closed, at the moment, due to the fact that the supporting force of the valve core of the electromagnetic valve is not available, the elastic force of the damping elastic mechanism can push the piston and the damping rod to move downwards, and a part of hydraulic oil located in the hydraulic oil lower cavity can enter the hydraulic oil upper cavity through the release oil way, so that the hydraulic damper is restored to an initial state.
Drawings
Fig. 1 is a front cross-sectional view of a hydraulic damper in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a flow channel adjusting block according to an embodiment of the present invention;
FIG. 3 is an elevation view of a rod guide sleeve according to an embodiment of the present invention;
FIG. 4 is a bottom view of the rod guide sleeve according to an embodiment of the present invention;
fig. 5 is a bottom view of the bottom cover in an embodiment of the present invention;
fig. 6 is a right side view of a fixation plate in an embodiment of the present invention;
in the figure: 1, a shell; 11 a limit bulge; 2, a damping component; 21 a piston; 22 a piston sleeve; 221 a hydraulic oil upper cavity; 222 hydraulic oil lower cavity; 23 damping rods; 24, a one-way valve plate; 25 rod guide sleeves; 251 a polygonal limiting part; 3 damping elastic mechanism; 4, a flow passage adjusting block; 41 a rotating shaft; 5 damping oil way; 51 a first oil passage; 52 a second oil passage; 53 third oil passage; 54 a fourth oil passage; 6, releasing an oil way; 7 fixing the plate; 8, a bottom cover; 81 polygonal through holes; 82 limit the groove.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 6, a hydraulic damper includes a housing 1, a damping assembly 2, a damping elastic mechanism 3, a damping oil path 5, and a release oil path 6;
the damping assembly 2 is arranged in the housing 1, the damping assembly 2 includes a piston 21, a piston sleeve 22 and a damping rod 23, the piston 21 is movably sleeved in the piston sleeve 22, a hydraulic oil upper chamber 221 and a hydraulic oil lower chamber 222 are formed in the piston sleeve 22, the upper end of the damping rod 23 is connected with the piston 21, and the lower end of the damping rod 23 extends to the lower side of the housing 1 and extends to the outside of the housing 1; the damping elastic mechanism 3 is arranged in the hydraulic oil upper cavity 221, the upper end of the damping elastic mechanism 3 is connected with the piston sleeve 22, and the lower end of the damping elastic mechanism 3 is connected with the upper surface of the piston 21; in this embodiment, the damping elastic mechanism 3 is a spring; the hydraulic oil upper cavity 221 is located above the piston 21, and the hydraulic oil lower cavity 222 is located below the piston 21;
the damping oil path 5 and the release oil path 6 are both arranged inside the shell 1, the input end of the damping oil path 5 is communicated with the hydraulic oil upper chamber 221, and the output end of the damping oil path 5 is communicated with the hydraulic oil lower chamber 222; the input end of the release oil path 6 is communicated with the hydraulic oil lower cavity 222, and the output end of the release oil path 6 is communicated with the hydraulic oil upper cavity 221.
In the hydraulic damper, after the electromagnetic valve is powered on, the valve core of the electromagnetic valve moves and contacts with the damping rod 23, the damping rod 23 is jacked up, the piston 21 is pushed to move upwards by overcoming the acting force of the damping elastic mechanism 3, the volume of the hydraulic oil upper cavity 221 is reduced, a part of hydraulic oil enters the hydraulic oil lower cavity 222 after passing through the damping oil path 5, and as the hydraulic oil needs a period of time to flow through the damping oil path 5, the action time of the valve core of the electromagnetic valve can be prolonged, and the electromagnetic valve is slowly opened. When the electromagnetic valve is powered off, the valve core of the electromagnetic valve retracts, the damping rod 23 cannot block the valve core of the electromagnetic valve to move, the action time of the valve core of the electromagnetic valve is the rated action time of the electromagnetic valve, so that the electromagnetic valve is quickly closed, at the moment, because the supporting force of the valve core of the electromagnetic valve is not available, the elastic force of the damping elastic mechanism 3 can push the piston 21 and the damping rod 23 to move downwards, and a part of hydraulic oil in the hydraulic oil lower cavity 222 can enter the hydraulic oil upper cavity 221 through the release oil path 6, so that the hydraulic damper is restored to the initial state.
In some embodiments, the damping assembly 2 further includes a check valve plate 24, and the release oil path 6 is opened in the piston 21 and penetrates through the piston 21;
one end of the check valve plate 24 is arranged at the output end of the release oil path 6, and the other end of the check valve plate 24 is fixedly connected with the upper surface of the piston 21.
In this embodiment, the check valve sheet 24 is made of rubber. Work as damping elastic mechanism 3 promotes piston 21 with behind the downstream of damping rod 23, the volume of hydraulic oil cavity 222 reduces, and the pressure increases, hydraulic oil will get into release oil circuit 6, and promote check valve piece 24 to the direction perk of hydraulic oil epicoele 221, at this moment hydraulic oil cavity 222 passes through release oil circuit 6 with hydraulic oil epicoele 221 intercommunication to the part hydraulic oil that is located hydraulic oil cavity 222 can pass through release oil circuit 6 gets into hydraulic oil epicoele 221, thereby makes the hydraulic damper resumes initial condition.
It should be noted that, as shown in fig. 1 and 2, the hydraulic damper further includes a flow passage adjusting block 4, the damping oil path 5 includes a first oil path 51, a second oil path 52 and a third oil path 53, the first oil path 51 is opened in the flow passage adjusting block 4, the second oil path 52 is opened in the piston sleeve 22, and a gap between the housing 1 and the piston sleeve 22 forms the third oil path 53; the flow channel adjusting block 4 is disposed on the piston sleeve 22 and is rotatably connected to the piston sleeve 22, wherein the length direction of the first oil passage 51 is perpendicular to the rotating shaft 41 of the flow channel adjusting block 4;
the input end of the first oil passage 51 is communicated with the hydraulic oil upper cavity 221, the output end of the first oil passage 51 faces the second oil passage 52 and is communicated with the second oil passage 52, the output end of the second oil passage 52 is communicated with the input end of the third oil passage 53, and the output end of the third oil passage 53 is communicated with the hydraulic oil lower cavity 222.
The damping rod 23 is jacked up to overcome the acting force of the damping elastic mechanism 3 to push the piston 21 to move upwards, the volume of the hydraulic oil upper cavity 221 is reduced, and a part of hydraulic oil located in the hydraulic oil upper cavity 221 enters the hydraulic oil lower cavity 222 after sequentially passing through the first oil passage 51, the second oil passage 52 and the third oil passage 53. The flow channel adjusting block 4 is rotated to enable the output end of the first oil channel 51 to be staggered with or completely coincide with the input end of the second oil channel 52, so that the cross-sectional area of the coincidence of the output end of the first oil channel 51 and the input end of the second oil channel 52 can be adjusted by rotating the flow channel adjusting block 4, the flow rate of the hydraulic oil flowing into the damping oil channel 5 is adjusted, the time of the hydraulic oil flowing into the hydraulic oil lower cavity 222 from the hydraulic oil upper cavity 221 is adjusted, the time of the damping rod 23 in movement is adjusted, and the purpose of indirectly adjusting the action time of the electromagnetic valve after being electrified is achieved. In the embodiment, the adjustable range of the action time after the electromagnetic valve is electrified is 1s-60s.
Optionally, the damping oil path 5 further includes a fourth oil path 54, the fourth oil path 54 sequentially passes through the piston sleeve 22 and the piston 21, an input end of the fourth oil path 54 is communicated with an output end of the third oil path 53, and an output end of the fourth oil path 54 is communicated with the hydraulic oil lower cavity 222. A part of the hydraulic oil in the hydraulic oil upper chamber 221 sequentially passes through the first oil passage 51, the second oil passage 52, the third oil passage 53 and the fourth oil passage 54 and then enters the hydraulic oil lower chamber 222.
Preferably, the damping assembly 2 further comprises a rod guide 25, the upper end of the rod guide 25 is connected with the piston 21, and the damping rod 23 is sleeved in the rod guide 25; the lower end of the rod guide sleeve 25 extends to the outside of the shell 1 towards the lower side of the shell 1, and the lower end of the rod guide sleeve 25 is provided with threads matched with the electromagnetic valve. The hydraulic damper is threadedly coupled to the solenoid valve through the rod guide 25 so that the spool of the solenoid valve can be aligned with the damping rod 23.
In some embodiments, the hydraulic damper further comprises a bottom cover 8, the bottom cover 8 is disposed at the lower side of the housing 1, the rod guide 25 is connected to the piston 21 after passing through the bottom cover 8, and the rod guide 25 is slidably connected to the bottom cover 8. Therefore, the rod guide sleeve 25 can move along the length direction of the rod guide sleeve 25 relative to the bottom cover 8, so as to drive the damping rod 23 to stretch and retract, thereby adjusting the distance between the damping rod 23 and the solenoid valve, and further realizing that the valve core of the solenoid valve is contacted with the damping rod 23 only after the solenoid valve is opened for a certain time, and the damping rod 23 has a damping effect on the solenoid valve.
It should be noted that, as shown in fig. 1, 3, 4 and 5, a polygonal limiting portion 251 is disposed on an outer wall of the rod guide sleeve 25, a polygonal through hole 81 corresponding to the polygonal limiting portion 251 is disposed on the bottom cover 8, the rod guide sleeve 25 passes through the polygonal through hole 81 and then is connected to the piston 21, and the polygonal limiting portion 251 is disposed in the polygonal through hole 81. Thus, after the rod guide sleeve 25 passes through the polygonal through hole 81 and the polygonal limiting portion 251 is disposed in the polygonal through hole 81, the rod guide sleeve 25 can be limited from rotating, and the rod guide sleeve 25 can only move along the length direction of the rod guide sleeve 25 relative to the bottom cover 8, so that the damping rod 23 can only move telescopically relative to the bottom cover 8. In this embodiment, the polygonal limiting portion 251 is a hexagon head, and the polygonal through hole 81 is a hexagon hole.
Specifically, a limiting groove 82 is formed on the peripheral wall surface of the bottom cover 8, a limiting protrusion 11 is arranged on the lower side of the housing 1, the limiting groove 82 corresponds to the limiting protrusion 11, and the limiting protrusion 11 is arranged in the limiting groove 82. In this way, the bottom cover 8 can be fixed on the lower side of the housing 1 through the limiting groove 82 and the limiting protrusion 11, and the bottom cover 8 and the housing 1 are prevented from moving relatively.
Preferably, as shown in fig. 6, a fixing plate 7 is disposed on a side wall of the housing 1, and the fixing plate 7 has a C-shaped structure. Through fixed plate 7, can with casing 1 with the shell joint of solenoid valve gets up, and the fixed plate 7 of C shape structure can make things convenient for being connected of casing 1 and solenoid valve. Specifically, the fixing plate 7 is connected to the housing of the solenoid valve by means of screws, and in order to eliminate an axial gap, a wave-shaped elastic washer is provided between the fixing plate 7 and the housing of the solenoid valve, so that the hydraulic damper can be rotated at the joint of the fixing plate 7 and the housing of the solenoid valve by slightly loosening the connected screws, thereby adjusting the position and angle of the hydraulic damper.
Specifically, the upper end of the flow channel adjusting block 4 extends upwards to the outer side of the housing 1, and the upper end of the flow channel adjusting block 4 is provided with a scale for marking a corner position. By arranging the scales for marking the corner positions on the flow passage adjusting block 4, the relative position of the flow passage adjusting block 4 relative to the piston sleeve 22 can be clearly known, so that the current flow rate of the hydraulic oil can be known.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.
Claims (10)
1. The utility model provides a hydraulic damper, includes casing, damping subassembly, damping elastic mechanism, damping oil circuit and release oil circuit, its characterized in that:
the damping assembly is arranged in the shell and comprises a piston, a piston sleeve and a damping rod, the piston is movably sleeved in the piston sleeve, a hydraulic oil upper cavity and a hydraulic oil lower cavity are formed in the piston sleeve, the upper end of the damping rod is connected with the piston, and the lower end of the damping rod extends to the lower side of the shell and extends to the outside of the shell; the damping elastic mechanism is arranged in the hydraulic oil upper cavity, the upper end of the damping elastic mechanism is connected with the piston sleeve, and the lower end of the damping elastic mechanism is connected with the upper surface of the piston;
the damping oil path and the release oil path are both arranged inside the shell, the input end of the damping oil path is communicated with the hydraulic oil upper cavity, and the output end of the damping oil path is communicated with the hydraulic oil lower cavity; the input end of the release oil path is communicated with the hydraulic oil lower cavity, and the output end of the release oil path is communicated with the hydraulic oil upper cavity.
2. A hydraulic damper as set forth in claim 1 wherein: the damping assembly further comprises a one-way valve plate, and the release oil way is arranged on the piston and penetrates through the piston;
one end of the one-way valve plate is arranged at the output end of the release oil way, and the other end of the one-way valve plate is fixedly connected with the upper surface of the piston.
3. A hydraulic damper as set forth in claim 1 wherein: the hydraulic damper further comprises a flow passage adjusting block, the damping oil path comprises a first oil path, a second oil path and a third oil path, the first oil path is arranged on the flow passage adjusting block, the second oil path is arranged on the piston sleeve, and a gap between the shell and the piston sleeve forms the third oil path; the flow channel adjusting block is arranged on the piston sleeve and is rotationally connected with the piston sleeve, wherein the length direction of the first oil channel is perpendicular to a rotating shaft of the flow channel adjusting block;
the input end of the first oil duct is communicated with the hydraulic oil upper cavity, the output end of the first oil duct faces the second oil duct and is communicated with the second oil duct, the output end of the second oil duct is communicated with the input end of the third oil duct, and the output end of the third oil duct is communicated with the hydraulic oil lower cavity.
4. A hydraulic damper as claimed in claim 3, characterized in that: the damping oil path further comprises a fourth oil path, the fourth oil path sequentially penetrates through the piston sleeve and the piston, the input end of the fourth oil path is communicated with the output end of the third oil path, and the output end of the fourth oil path is communicated with the hydraulic oil lower cavity.
5. A hydraulic damper as set forth in claim 1 wherein: the damping assembly further comprises a rod guide sleeve, the upper end of the rod guide sleeve is connected with the piston, and the damping rod is sleeved in the rod guide sleeve; the lower end of the rod guide sleeve extends to the outside of the shell towards the lower side of the shell, and threads matched with the electromagnetic valve are arranged at the lower end of the rod guide sleeve.
6. A hydraulic damper as set forth in claim 5 wherein: the hydraulic damper further comprises a bottom cover, the bottom cover is arranged on the lower side of the shell, the rod guide sleeve penetrates through the bottom cover and then is connected with the piston, and the rod guide sleeve is connected with the bottom cover in a sliding mode.
7. A hydraulic damper as set forth in claim 6 wherein: the outer wall of the rod guide sleeve is provided with a polygonal limiting portion, the bottom cover is provided with a polygonal through hole corresponding to the polygonal limiting portion, the rod guide sleeve penetrates through the polygonal through hole and then is connected with the piston, and the polygonal limiting portion is arranged in the polygonal through hole.
8. A hydraulic damper as set forth in claim 6 wherein: the bottom cover is characterized in that a limiting groove is formed in the peripheral wall surface of the bottom cover, a limiting protruding portion is arranged on the lower side of the shell, the limiting groove corresponds to the limiting protruding portion, and the limiting protruding portion is arranged in the limiting groove.
9. A hydraulic damper as set forth in claim 1 wherein: the lateral wall of casing is equipped with the fixed plate, the fixed plate is C shape structure.
10. A hydraulic damper as set forth in claim 3 wherein: the upper end of the flow channel adjusting block extends upwards to the outer side of the shell, and the upper end of the flow channel adjusting block is used for marking scales of corner positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222263532.7U CN218817813U (en) | 2022-08-27 | 2022-08-27 | Hydraulic damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222263532.7U CN218817813U (en) | 2022-08-27 | 2022-08-27 | Hydraulic damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218817813U true CN218817813U (en) | 2023-04-07 |
Family
ID=87269268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222263532.7U Active CN218817813U (en) | 2022-08-27 | 2022-08-27 | Hydraulic damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218817813U (en) |
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2022
- 2022-08-27 CN CN202222263532.7U patent/CN218817813U/en active Active
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