CN216642652U - Closed hydraulic linear driver - Google Patents
Closed hydraulic linear driver Download PDFInfo
- Publication number
- CN216642652U CN216642652U CN202122640065.0U CN202122640065U CN216642652U CN 216642652 U CN216642652 U CN 216642652U CN 202122640065 U CN202122640065 U CN 202122640065U CN 216642652 U CN216642652 U CN 216642652U
- Authority
- CN
- China
- Prior art keywords
- cavity
- cylinder body
- hydraulic cylinder
- hydraulic
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Actuator (AREA)
Abstract
The utility model discloses a closed hydraulic linear driver, comprising: the hydraulic cylinder comprises a hydraulic cylinder body and a driving device, wherein a motion cavity is arranged in the hydraulic cylinder body, hydraulic oil is filled in the motion cavity, a piston motion part is connected in the motion cavity in a sliding mode and comprises a piston motion head part and a rod-shaped connecting part, one end of the rod-shaped connecting part penetrates through the upper end face of the hydraulic cylinder body and extends to the outside, and the piston motion head part abuts against the inner side wall of the hydraulic cylinder body; the piston moving head divides the moving cavity into a first cavity and a second cavity; a reserved space is clamped between the inner side wall and the outer side wall of the hydraulic cylinder body; an air cavity is arranged inside the rod-shaped connecting part; the driving output end of the driving device is connected with a pump set; first intercommunication mouth and second intercommunication mouth have been seted up to the pump package, and first intercommunication mouth intercommunication second cavity, second intercommunication mouth intercommunication headspace, the headspace switches on with first cavity, and first cavity switches on with the air cavity. The utility model improves the structural compactness of the hydraulic linear actuator.
Description
Technical Field
The utility model relates to the technical field, in particular to a closed hydraulic linear driver.
Background
Traditional hydraulic drive system comprises triplex, including actuating lever, hydraulic oil pump and oil drum. The hydraulic oil pump consists of four parts, including pump body, rectangular oil tank, pressing handle and superhigh pressure steel wire braided rubber hose, and the power element of the hydraulic system converts the mechanical energy of the prime mover into pressure energy of liquid and provides power for the whole hydraulic driving system. When the hydraulic oil pump begins to operate, pump into liquid or draw liquid in to the actuating lever for the inside piston rod reciprocating motion of actuating lever leads to the inside space of hydro-cylinder of actuating lever constantly changing, need receive the interior exhaust liquid of hydro-cylinder through outside oil drum. Therefore, the traditional fixed hydraulic driving system has the defects of large volume and insufficient structural compactness.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a closed type hydraulic linear actuator, which is used for reducing the volume of the hydraulic linear actuator and improving the structural compactness of the hydraulic linear actuator.
In order to achieve the purpose, the utility model provides the following technical scheme: an enclosed hydraulic linear drive comprising:
the hydraulic cylinder comprises a hydraulic cylinder body and a driving device, wherein a motion cavity is arranged in the hydraulic cylinder body, hydraulic oil is filled in the motion cavity, a piston motion part is connected in the motion cavity in a sliding mode and comprises a piston motion head and a rod-shaped connecting part, the piston motion head is fixedly connected with the rod-shaped connecting part, one end, far away from the piston motion head, of the rod-shaped connecting part penetrates through the upper end face of the hydraulic cylinder body and extends to the outside, and the piston motion head is in sliding and abutting contact with the inner side wall of the hydraulic cylinder body;
the piston moving head divides the moving cavity into a first cavity and a second cavity, and the first cavity is positioned above the second cavity;
a reserved space is clamped between the inner side wall and the outer side wall of the hydraulic cylinder body;
an air cavity is arranged inside the rod-shaped connecting part, and air is filled inside the air cavity;
the driving device is arranged at the lower end of the hydraulic cylinder body, the driving output end of the driving device is connected with a pump set, and the driving device is used for driving the pump set to operate;
the pump set is provided with a first communicating port and a second communicating port, the first communicating port is communicated with the second cavity, the second communicating port is communicated with the reserved space, the reserved space is communicated with the first cavity, and the first cavity is also communicated with the air cavity;
when the driving device operates in the forward direction, the pump set pumps the hydraulic oil in the first cavity into the second cavity to drive the piston moving piece to move vertically upwards.
Further, the pump package is the gear pump, the gear pump includes the pump case, first intercommunication mouth with the second intercommunication mouth is seted up respectively in the both sides of pump case, inside first rotation cavity and the second rotation cavity of being equipped with of pump case, first rotation cavity intercommunication the second rotates the cavity, rotationally be provided with the driving gear in the first rotation cavity, rotationally be provided with driven gear in the second rotation cavity, the driving gear meshing driven gear.
Furthermore, the driving device is a driving motor, an output shaft of the driving motor penetrates through the pump shell and extends into the first rotating cavity, and the driving gear is sleeved on the output shaft of the driving motor.
Further, a supporting seat is fixedly arranged at the lower end of the hydraulic cylinder body, the upper end face of the supporting seat is abutted to the lower end face of the hydraulic cylinder body in a fitting mode, and the gear pump fixing frame is arranged inside the supporting seat.
Further, the piston moving member is a piston rod.
Furthermore, the reserved space is an interlayer, and the shape of the interlayer is matched with that of the hydraulic cylinder.
Furthermore, a transmission pipeline is arranged between the second communication port and the reserved space, and the second communication port is communicated with the reserved space through the transmission pipeline.
Furthermore, a first through hole penetrates through the lower end face of the hydraulic cylinder body, and the second cavity is communicated with the first communication port through the first through hole.
Furthermore, at least one second through hole penetrates through the inner side wall of the hydraulic cylinder body and the reserved space, and the reserved space is communicated with the first cavity through the second through hole.
Furthermore, at least one third through hole penetrates through the space between the side wall of the rod-shaped connecting part and the air cavity, and the air cavity is communicated with the first cavity through the third through hole.
The utility model has the beneficial effects that:
according to the hydraulic linear actuator, the reserved space is arranged between the inner side wall and the outer side wall of the hydraulic cylinder body, and the air cavity is arranged in the rod-shaped connecting part, so that when the driving device drives the pump set to extract hydraulic oil in the first cavity or the second cavity through the reserved space, the hydraulic oil can be pumped into or discharged out of the air cavity of the rod-shaped connecting part to offset the volume change of the movement cavity in the hydraulic cylinder body, and an oil drum is not required to be additionally arranged to discharge or pump the hydraulic oil, so that the structural compactness of the hydraulic linear actuator is improved, the overall volume of the hydraulic linear actuator is reduced, and the high integration of the hydraulic linear actuator is realized; meanwhile, the hydraulic linear actuator is sealed with the external environment, so that the adverse effect of the external environment on the internal structure of the hydraulic linear actuator is avoided.
Drawings
FIG. 1 is an internal cross-sectional view of the present invention;
fig. 2 is an external structural view of the present invention.
Reference numerals: 1. a hydraulic cylinder block; 11. a first cavity; 12. a second cavity; 13. reserving space; 14. a first through hole; 15. a second through hole; 16. a third through hole; 2. a drive device; 3. a piston moving member; 31. A piston motion head; 32. a rod-shaped connecting portion; 33. an air cavity; 4. a pump group; 41. a first communication port; 42. a second communication port; 43. a transport pipeline; 5. and (4) supporting the base.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1 and 2, the enclosed hydraulic linear actuator of the present embodiment includes:
the hydraulic cylinder comprises a hydraulic cylinder body 1 and a driving device 2, wherein a motion cavity is arranged in the hydraulic cylinder body 1, hydraulic oil is filled in the motion cavity, a piston motion part 3 is connected in the motion cavity in a sliding manner, the piston motion part 3 comprises a piston motion head part 31 and a rod-shaped connecting part 32, the piston motion head part 31 is fixedly connected with the rod-shaped connecting part 32, one end, far away from the piston motion head part 31, of the rod-shaped connecting part 32 penetrates through the upper end face of the hydraulic cylinder body 1 and extends to the outside, and the piston motion head part 31 is in sliding and abutting contact with the inner side wall of the hydraulic cylinder body 1;
the piston moving head 31 divides the moving cavity into a first cavity 11 and a second cavity 12, and the first cavity 11 is positioned above the second cavity 12;
a reserved space 13 is clamped between the inner side wall and the outer side wall of the hydraulic cylinder body 1;
an air cavity 33 is arranged inside the rod-shaped connecting part 32, and air is filled inside the air cavity 33;
the driving device 2 is arranged at the lower end of the hydraulic cylinder body 1, the driving output end of the driving device 2 is connected with a pump set 4, and the driving device 2 is used for driving the pump set 4 to operate;
the pump unit 4 is provided with a first communication port 41 and a second communication port 42, the first communication port 41 is communicated with the second cavity 12, the second communication port 42 is communicated with the reserved space 13, the reserved space 13 is communicated with the first cavity 11, and the first cavity 11 is also communicated with the air cavity 33;
when the driving device 2 runs in the forward direction, the pump set 4 pumps the hydraulic oil in the first cavity 11 into the second cavity 12, so that the piston moving part 3 is driven to move vertically upwards.
According to the technical scheme, the reserved space 13 is arranged between the inner side wall and the outer side wall of the hydraulic cylinder body 1, and the air cavity 33 is arranged in the rod-shaped connecting portion 32, so that when the driving device 2 drives the pump set 4 to extract hydraulic oil in the first cavity 11 or the second cavity 12 through the reserved space 13, the hydraulic oil can be pumped into or discharged out of the air cavity 33 of the rod-shaped connecting portion 32 to offset the volume change of the moving cavity in the hydraulic cylinder body 1, an oil drum is not required to be additionally arranged to discharge or pump the hydraulic oil, the structural compactness of the hydraulic linear driver is improved, the overall volume of the hydraulic linear driver is reduced, and the high integration of the hydraulic linear driver is realized; meanwhile, the hydraulic linear actuator is sealed with the external environment, so that the adverse effect of the external environment on the internal structure of the hydraulic linear actuator is avoided.
In a preferred embodiment, the enclosed hydraulic linear drive is applied to a dental chair for cushioning the dental chair. The rod-shaped connecting part 32 of the closed hydraulic linear driver is fixedly connected with the chair seat of the dental chair. When a patient sits on the dental chair, the rod-shaped connecting part 32 of the hydraulic linear driver is subjected to gravity from vertical downward during closing, the driving device 2 runs in the forward direction, the driving pump set 4 pumps hydraulic oil in the first cavity 11 into the second cavity 12 through the reserved space 13, the hydraulic pressure of the second cavity 12 is increased, the hydraulic pressure of the first cavity 11 is reduced, and the piston moving head 31 is driven to move upwards under the action of the hydraulic pressure. Therefore, the piston moving part 3 provides a vertical upward thrust for the chair seat, offsets a part of gravity of a patient on the chair seat, slows down the descending speed of the chair seat and further realizes effective buffering of the dental chair.
Preferably, the pump set 4 is a gear pump, the gear pump comprises a pump case, the first communicating port 41 and the second communicating port 42 are respectively arranged on two sides of the pump case, a first rotating cavity and a second rotating cavity are arranged inside the pump case, the first rotating cavity is communicated with the second rotating cavity, a driving gear is rotatably arranged in the first rotating cavity, a driven gear is rotatably arranged in the second rotating cavity, and the driving gear is meshed with the driven gear.
Preferably, the driving device 2 is a driving motor, an output shaft of the driving motor penetrates through the pump shell and extends into the first rotating cavity, and the driving gear is sleeved on the output shaft of the driving motor. When the driving motor operates, the output shaft of the driving motor drives the driving gear to rotate, the driving gear drives the driven gear to rotate, and at the moment, the hydraulic pressure inside the first rotating cavity and the second rotating cavity changes. When the driving motor rotates forwards, the driving gear and the driven gear rotate forwards, so that the hydraulic pressure at the second communicating port 42 is reduced, the hydraulic oil in the reserved space 13 is pumped into the pump shell, is discharged from the second communicating port 42 and flows into the second cavity 12. When the driving motor rotates reversely, the driving gear and the driven gear rotate reversely, so that the hydraulic pressure at the first communication port 41 is reduced, the hydraulic oil in the second cavity 12 is pumped into the pump shell and is discharged from the first communication port 41, flows into the reserved space 13, is discharged into the first cavity 11 from the reserved space 13, and is finally discharged into the air cavity 33 from the first cavity 11.
Preferably, the lower end of the hydraulic cylinder body 1 is fixedly provided with a supporting seat 5, the upper end face of the supporting seat 5 abuts against the lower end face of the hydraulic cylinder body 1 in a fitting manner, and the gear pump fixing frame is arranged inside the supporting seat 5. Through setting up supporting seat 5, realized effectively supporting hydraulic cylinder body 1, realized the fixed of gear pump simultaneously, promoted this technical scheme's structural stability.
Preferably, the piston moving member 3 is a piston rod.
Preferably, the reserved space 13 is a sandwich layer, and the shape of the sandwich layer is matched with that of the hydraulic cylinder body 1. Further, the reserved space 13 can also be a drilled hole and a milled groove between the inner side wall and the outer side wall of the hydraulic cylinder block 1.
Preferably, a transfer pipe 43 is provided between the second communication port 42 and the headspace 13, and the second communication port 42 communicates with the headspace 13 via the transfer pipe 43.
Preferably, a first through hole 14 is formed through the lower end surface of the hydraulic cylinder block 1, and the second cavity 12 is communicated with the first communication port 41 through the first through hole 14. In the present embodiment, two first through holes 14 are provided.
Preferably, at least one second through hole 15 is arranged between the inner side wall of the hydraulic cylinder body 1 and the reserved space 13 in a penetrating manner, and the reserved space 13 is communicated with the first cavity 11 through the second through hole 15. In the present embodiment, two second through holes 15 are provided.
Preferably, at least one third through hole 16 is formed between the side wall of the rod-shaped connecting portion 32 and the air cavity 33, and the air cavity 33 is communicated with the first cavity 11 through the third through hole 16. In the present embodiment, two third through holes 16 are provided.
The working principle is as follows:
the hydraulic oil flow between the first chamber 11 and the second chamber 12 is driven by operation of the driving device 2. When the driving device 2 is not operated, the hydraulic oil cannot flow between the first chamber 11 and the second chamber 12, and therefore the rod-shaped connecting portion 32 of the piston moving member 3 cannot move up and down by the hydraulic pressure.
When the rod-shaped connecting part 32 of the piston moving part 3 is pressed vertically downwards, the driving device 2 runs in the forward direction, the driving pump group 4 pumps the hydraulic oil in the first cavity 11 into the second cavity 12 through the reserved space 13, the hydraulic pressure of the second cavity 12 is increased, the hydraulic pressure of the first cavity 11 is decreased, and the piston moving head 31 is driven to move upwards under the action of the hydraulic pressure; at this time, the rod-like connecting portion 32 connected to the piston moving head 31 is gradually pushed out of the movable chamber, the internal space of the movable chamber is gradually increased, at this time, part of the hydraulic oil in the movable chamber is discharged from the air chamber 33 into the first chamber 11, and at this time, a part of the volume of the air chamber 33 originally occupied by the hydraulic oil is released, so that the air pressure in the air chamber 33 is reduced.
When the rod-shaped connecting part 32 of the piston moving part 3 is pulled upwards vertically, the driving device 2 runs in the reverse direction, the driving pump group 4 pumps the hydraulic oil in the second cavity 12 into the first cavity 11 through the reserved space 13, at the moment, the hydraulic pressure of the first cavity 11 is increased, the hydraulic pressure of the second cavity 12 is decreased, and the piston moving head 31 is driven to move downwards under the action of the hydraulic pressure; at this time, the rod-shaped connecting portion 32 connected to the piston moving head 31 is gradually pushed into the movable cavity, the internal space of the movable cavity is gradually occupied by the pushed-in rod-shaped connecting portion 32, and the internal volume of the movable cavity is not changed, so that part of the hydraulic oil in the movable cavity is forced to be pressed into the air chamber 33, and at this time, the volume of the air chamber 33 is partially occupied by the hydraulic oil, so that the air chamber 33 is forced to be compressed by the original air volume, and the air pressure in the air chamber 33 is increased.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.
Claims (10)
1. The closed hydraulic linear driver is characterized by comprising a hydraulic cylinder body (1) and a driving device (2), wherein a motion cavity is arranged in the hydraulic cylinder body (1), hydraulic oil is filled in the motion cavity, a piston motion part (3) is connected in the motion cavity in a sliding manner, the piston motion part (3) comprises a piston motion head (31) and a rod-shaped connecting part (32), the piston motion head (31) is fixedly connected with the rod-shaped connecting part (32), one end, far away from the piston motion head (31), of the rod-shaped connecting part (32) penetrates through the upper end face of the hydraulic cylinder body (1) and extends to the outside, and the piston motion head (31) is in sliding abutting contact with the inner side wall of the hydraulic cylinder body (1);
the piston movement head (31) divides the movement cavity into a first cavity (11) and a second cavity (12), the first cavity (11) being located above the second cavity (12);
a reserved space (13) is arranged between the inner side wall and the outer side wall of the hydraulic cylinder body (1) in a clamping mode;
an air cavity (33) is arranged inside the rod-shaped connecting part (32), and air is filled inside the air cavity (33);
the driving device (2) is arranged at the lower end of the hydraulic cylinder body (1), the driving output end of the driving device (2) is connected with a pump set (4), and the driving device (2) is used for driving the pump set (4) to operate;
the pump unit (4) is provided with a first communication port (41) and a second communication port (42), the first communication port (41) is communicated with the second cavity (12), the second communication port (42) is communicated with the reserved space (13), the reserved space (13) is communicated with the first cavity (11), and the first cavity (11) is also communicated with the air cavity (33);
when the driving device (2) operates in the forward direction, the pump set (4) pumps the hydraulic oil in the first cavity (11) into the second cavity (12) to drive the piston moving piece (3) to move vertically upwards.
2. The enclosed hydraulic linear drive of claim 1, wherein: pump package (4) is the gear pump, the gear pump includes the pump case, first intercommunication mouth (41) with second intercommunication mouth (42) are seted up respectively in the both sides of pump case, inside first rotation cavity and the second rotation cavity of being equipped with of pump case, first rotation cavity intercommunication the cavity is rotated to the second, rotationally be provided with the driving gear in the first rotation cavity, rotationally be provided with driven gear in the second rotation cavity, the driving gear meshing driven gear.
3. The enclosed hydraulic linear drive of claim 2, wherein: the driving device (2) is a driving motor, an output shaft of the driving motor penetrates through the pump shell and extends into the first rotating cavity, and the driving gear is sleeved on the output shaft of the driving motor.
4. The enclosed hydraulic linear drive of claim 3, wherein: the hydraulic cylinder body (1) lower extreme is fixed and is provided with supporting seat (5), the up end of supporting seat (5) with the lower terminal surface laminating of hydraulic cylinder body (1) offsets, the gear pump fixed frame is located inside supporting seat (5).
5. The enclosed hydraulic linear drive of claim 1, wherein: the piston moving part (3) is a piston rod.
6. The enclosed hydraulic linear drive of claim 1, wherein: the reserved space (13) is an interlayer, and the shape of the interlayer is matched with that of the hydraulic cylinder body (1).
7. The enclosed hydraulic linear drive of claim 1, wherein: a transmission pipeline (43) is arranged between the second communication port (42) and the reserved space (13), and the second communication port (42) is communicated with the reserved space (13) through the transmission pipeline (43).
8. The enclosed hydraulic linear drive of claim 1, wherein: the lower end face of the hydraulic cylinder body (1) is provided with a first through hole (14) in a penetrating mode, and the second cavity (12) is communicated with the first communication hole (41) through the first through hole (14).
9. The enclosed hydraulic linear drive of claim 1, wherein: at least one second through hole (15) penetrates between the inner side wall of the hydraulic cylinder body (1) and the reserved space (13), and the reserved space (13) is communicated with the first cavity (11) through the second through hole (15).
10. The enclosed hydraulic linear drive of claim 1, wherein: at least one third through hole (16) penetrates through the space between the side wall of the rod-shaped connecting portion (32) and the air cavity (33), and the air cavity (33) is communicated with the first cavity (11) through the third through hole (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122640065.0U CN216642652U (en) | 2021-10-29 | 2021-10-29 | Closed hydraulic linear driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122640065.0U CN216642652U (en) | 2021-10-29 | 2021-10-29 | Closed hydraulic linear driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216642652U true CN216642652U (en) | 2022-05-31 |
Family
ID=81734592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122640065.0U Active CN216642652U (en) | 2021-10-29 | 2021-10-29 | Closed hydraulic linear driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216642652U (en) |
-
2021
- 2021-10-29 CN CN202122640065.0U patent/CN216642652U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110397565B (en) | Variable plunger pump | |
| US6793467B2 (en) | Thick matter pump | |
| CN216642652U (en) | Closed hydraulic linear driver | |
| CN216477715U (en) | Piston reciprocating type bidirectional acting double-liquid grouting pump | |
| CN114001066A (en) | Closed hydraulic linear driver | |
| CN109416060A (en) | Cylinder driving device | |
| CN201925133U (en) | Electric diaphragm pump | |
| CN212744576U (en) | Hydraulic cylinder with control air valve | |
| CN108547749B (en) | Electric water pump and squirt structure | |
| CN206839694U (en) | A kind of manual hydraulic device for having fast absorbing oil function | |
| CN216111151U (en) | Motor direct-drive fracturing device | |
| CN202152718U (en) | Double-acting plunger pump with low rotational speed and large discharge capacity | |
| CN201265493Y (en) | Plunger pump | |
| CN103982397A (en) | Hand-operated air compressor | |
| CN111877976A (en) | Angle-adjustable ground drilling equipment | |
| CN204267848U (en) | A kind of novel vacuum locking-valve | |
| BR102016020653A2 (en) | HYDRAULIC POWER GENERATING SYSTEM | |
| CN220929808U (en) | Self-pressurization closed system and assembly | |
| JP6975360B1 (en) | Manual air pump manpower substitute drive | |
| CN101424255A (en) | Mineral fluid high-pressure delivery pump | |
| CN213416184U (en) | Electric hydraulic cylinder for forklift | |
| US877583A (en) | Balanced pump. | |
| CN107339231B (en) | A kind of suction pump elevated pressurization device | |
| JP4323025B2 (en) | Drive device in press | |
| CN215109308U (en) | Energy-saving plunger pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |