CN217327904U

CN217327904U - Novel piston sealing structure of hydraulic cylinder

Info

Publication number: CN217327904U
Application number: CN202122972046.8U
Authority: CN
Inventors: 张慧慧
Original assignee: Yantai Qiankun Hydraulic Equipment Co ltd
Current assignee: Yantai Qiankun Hydraulic Equipment Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-08-30
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a novel piston seal structure of pneumatic cylinder, including the hydro-cylinder section of thick bamboo, the hydro-cylinder cover is installed to hydro-cylinder section of thick bamboo one side, is provided with the piston in the hydro-cylinder section of thick bamboo, installs the piston rod in the piston, and ring channel I has been seted up to piston left and right sides symmetry, installs the sealed soft cover that the edge is the cockscomb structure in the ring channel I, all is provided with two sets of extrusion devices in the ring channel I, and extrusion device and the setting of the contact of sealed soft cover inner wall, four inlet openings have been seted up to piston left and right sides symmetry, and every inlet opening communicates with the extrusion device that corresponds respectively. The sealed flexible sleeve of cockscomb structure has been installed, and the oil pressure of hydraulic oil is big more, and the pressure that produces extrusion device is also big more, and the sealed flexible sleeve of extrusion device exerts force, has strengthened sealedly, has avoided because the phenomenon of the big oil leak of oil pressure to set up the sealing ring in the centre of piston, multiple protection has further promoted sealed between piston and the oil cylinder section of thick bamboo, has reduced the incident because the oil leak produces.

Description

Novel piston sealing structure of hydraulic cylinder

Technical Field

The utility model relates to a pneumatic cylinder technical field specifically is a novel piston seal structure of pneumatic cylinder.

Background

The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion), and when the hydraulic actuating element is used for realizing reciprocating motion, a speed reducing device can be omitted, and the hydraulic actuating element has no transmission clearance and moves stably, so that the hydraulic actuating element is widely applied to various mechanical hydraulic systems. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area, and the hydraulic cylinder basically comprises a cylinder barrel, a cylinder cover, the piston, a piston rod, a sealing device, a buffering device and an exhaust device. Sealing between piston and the cylinder all has been the technological problem, and present sealed mostly one deck sealing washer seal, and sealed effect is extremely poor, and the oil leak easily when the oil pressure is great causes the pressure differential in the chamber of piston both sides to reduce for the output power of piston rod reduces, takes place the incident easily.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel piston seal structure of pneumatic cylinder to solve the problem that proposes in the above-mentioned background art.

In order to achieve the purpose, the utility model discloses a novel piston seal structure of pneumatic cylinder, including the oil cylinder section of thick bamboo, the oil cylinder lid is installed to oil cylinder section of thick bamboo one side, be provided with the piston in the oil cylinder section of thick bamboo, install the piston rod in the piston, ring channel one has been seted up to piston left and right sides symmetry, install the sealed soft cover that the edge is the cockscomb structure in the ring channel one, all be provided with two sets of extrusion device in the ring channel one, extrusion device and the contact setting of sealed soft cover inner wall, four inlet ports, every have been seted up to piston left and right sides symmetry the inlet port communicates with the extrusion device that corresponds respectively.

As a further aspect of the present invention: the extrusion device is including setting up the extrusion shell in ring channel one, the through-hole that communicates with the inlet port is seted up to extrusion shell bottom, two spinal branch daggers of fixedly connected with in the extrusion shell, the slip is provided with the slide on the support column, it has spring one still to overlap on the support column, the slide is connected to the spring one end, spring one other end and extrusion shell wall connection, one side fixedly connected with spliced pole of spring one is kept away from to the slide, the spliced pole run through to the extrusion shell outside and with the extrusion shell between the slip set up, the spliced pole is connected with the arc clamp plate, the arc clamp plate is connected through two springs with the extrusion shell, the arc clamp plate sets up with the contact of sealed mantle inner wall.

As a further aspect of the present invention: the piston is provided with a second annular groove in the middle, a wear-resisting ring is installed in the second annular groove and bears friction force instead of a sealing device, third annular grooves are symmetrically formed in two sides of the second annular groove, and special-shaped sealing rings are installed in the third annular groove. And the sealing between the piston and the oil cylinder barrel is strengthened.

As a further aspect of the present invention: an O-shaped sealing ring is arranged between the piston rod and the piston, and the O-shaped sealing ring is sleeved on the piston rod. For sealing between the piston and the piston rod.

As a further aspect of the present invention: and the left side and the right side of the piston are provided with bearing plates through bolts. The piston is prevented from being abraded by pressure generated by hydraulic oil.

The utility model has the advantages that: through adopting above technical scheme, simple structure, the installation of being convenient for has adopted neotype sealed scheme, has installed the sealed flexible sleeve of cockscomb structure, and the oil pressure of hydraulic oil is big more, and the pressure that produces extrusion device is just also big more, and the sealed flexible sleeve of extrusion device exerts force, has strengthened sealedly, has avoided because the phenomenon of the big oil leak of oil pressure to set up the sealing ring in the centre of piston, multiple protection has further promoted sealed between piston and the oil cylinder section, has reduced the incident because the oil leak produces.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

fig. 2 is a schematic structural view of the extrusion apparatus.

In the figure: 1-oil cylinder barrel, 2-oil cylinder cover, 3-piston, 4-piston rod, 5-annular groove I, 6-sealing soft sleeve, 7-extrusion device, 70-extrusion shell, 71-through hole, 72-support column, 73-sliding plate, 74-spring I, 75-connecting column, 76-arc-shaped pressing plate, 77-spring II, 8-oil inlet, 9-annular groove II, 10-wear-resisting ring, 11-annular groove III, 12-special-shaped sealing ring, 13-O-shaped sealing ring, 14-bolt and 15-bearing plate.

Detailed Description

The drawings are for illustrative purposes only, and some components in the drawings may be omitted, enlarged or reduced for better explanation of the present embodiments, and do not represent the size of an actual product.

Referring to the attached figure 1, a novel piston sealing structure of a hydraulic cylinder comprises an oil cylinder barrel 1, wherein an oil cylinder cover 2 is installed on one side of the oil cylinder barrel 1, a piston 3 is arranged in the oil cylinder barrel 1, a piston rod 4 is installed in the piston 3, bearing plates 15 are installed on the left side and the right side of the piston 3 through bolts 14, abrasion of pressure generated by hydraulic oil on the piston 3 is prevented, annular grooves 5 are symmetrically formed in the left side and the right side of the piston 3, sealing soft sleeves 6 with saw-toothed edges are installed in the annular grooves 5, one of the saw-toothed edges can store the hydraulic oil which permeates in, the other one of the saw-toothed edges can deform under the extrusion force of the extrusion devices 7, the sealing performance is improved, two groups of extrusion devices 7 are arranged in the annular grooves 5, the extrusion devices 7 are arranged in contact with the inner walls of the sealing soft sleeves 6, four oil inlet holes 8 are symmetrically formed in the left side and the right side of the piston 3, and the oil inlet holes 8 penetrate through the bearing plates 15, each oil inlet 8 is respectively communicated with a corresponding extrusion device 7, the middle of the piston 3 is provided with a second annular groove 9, a wear-resistant ring 10 is arranged in the second annular groove 9 to replace a sealing ring to play a role of wear resistance, two sides of the second annular groove 9 are symmetrically provided with third annular grooves 11, the third annular grooves 11 are internally provided with special-shaped sealing rings 12, one side of each special-shaped sealing ring 12, which is in contact with oil, is provided with an oil groove, if hydraulic oil penetrates into the soft sealing sleeve 6 and enters the annular groove III 11, a certain gap is formed in the annular groove III 11, the hydraulic oil enters an oil groove of the special-shaped sealing ring 12, then after the oil is full of oil, the oil pressure can extrude the special-shaped sealing ring 12, and upwards and downwards expand to increase the sealing effect, an O-shaped sealing ring 13 is arranged between the piston rod 4 and the piston 3 to seal the piston rod 4 and the piston 3, and the O-shaped sealing ring 13 is sleeved on the piston rod 4.

Further, referring to fig. 2, the extruding device 7 includes an extruding shell 70 disposed in the annular groove one 5, a through hole 71 communicated with the oil inlet hole 8 is disposed at the bottom of the extruding shell 70, two support columns 72 fixedly connected to the inside of the extruding shell 70, a sliding plate 73 and a spring one 74 are sleeved on the support columns 72, the sliding plate 73 is slidably connected to the support columns 72, the sliding plate 73 is connected to one end of the spring one 74, the other end of the spring one 74 is connected to the inner wall of the extruding shell 70, a connecting column 75 is fixedly connected to one side of the sliding plate 73 far away from the spring one 74, the connecting column 75 penetrates through to the outside of the extruding shell 70 and is connected to an arc-shaped pressing plate 76, the connecting column 75 is slidably connected to the extruding shell 70, the shape of the arc-shaped pressing plate 76 is matched with the inner wall of the sealing soft sleeve 6, the arc-shaped pressing plate 76 is connected to the extruding shell 70 through two springs 77, and the arc-shaped pressing plate 76 is in contact with the inner wall of the sealing soft sleeve 6. When oil is fed into the front cavity and oil is discharged from the rear cavity, hydraulic oil in the front cavity enters the extrusion shell 70 in the through hole 71, the sliding plate 73 is pushed by the hydraulic oil to slide, the connecting column 75 drives the arc-shaped pressing plate 76 to move, differential extrusion force is generated on the sealing soft sleeve 6, the sealing soft sleeve 6 is stressed to generate small deformation and generate larger sealing performance, when the hydraulic oil in the rear cavity is released, the hydraulic pressure is reduced, the arc-shaped pressing plate 76 is pulled by the second spring 77 to move back, the sliding plate 73 is pulled back to the initial position by matching with the first spring 74, the hydraulic oil is discharged from the through hole 71, and the sealing soft sleeve 6 returns to the initial state and position.

The working principle is as follows: when oil is fed into the front cavity and discharged from the rear cavity, the piston rod 4 moves rightwards, after the front cavity is filled with hydraulic oil, the hydraulic oil enters the oil inlet 8 and then enters the extrusion shell 70 in the through hole 71, the sliding plate 73 is pushed by the hydraulic oil to slide, the connecting column 75 drives the arc-shaped pressing plate 76 to move, differential extrusion force is generated on the sealing soft sleeve 6, the sealing soft sleeve 6 is stressed to generate micro deformation, the differential tightness is higher, when the hydraulic oil in the rear cavity is released, the hydraulic pressure is reduced, the spring II 77 pulls the arc-shaped pressing plate 76 to move backwards, the sliding plate 73 is pulled back to the initial position by matching with the spring I74, the hydraulic oil is discharged from the through hole 71, and the sealing soft sleeve 6 returns to the initial state and position; when the piston rod 4 moves leftwards, oil is discharged from the front cavity, oil is discharged from the rear cavity, the sealing soft sleeve 6 is extruded by the extrusion device 7 on the right side under the stress to increase the sealing, and the extrusion device 7 on the left side releases the pressure to discharge the hydraulic oil in the extrusion device 7 out of the oil inlet hole 8.

To sum up, the present invention is not limited to the above-mentioned specific embodiments. Those skilled in the art may make numerous changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to the claims of the present invention.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Claims

1. The utility model provides a novel piston seal structure of pneumatic cylinder, includes hydro-cylinder section (1), its characterized in that, hydro-cylinder section (1) one side is installed hydro-cylinder lid (2), be provided with piston (3) in hydro-cylinder section (1), install piston rod (4) in piston (3), ring channel (5) have been seted up to piston (3) left and right sides symmetry, install sealed soft cover (6) that the edge is the cockscomb structure in ring channel (5), all be provided with two sets of extrusion device (7) in ring channel (5), extrusion device (7) and sealed soft cover (6) inner wall contact setting, four inlet port (8), every have been seted up to piston (3) left and right sides symmetry inlet port (8) communicate with extrusion device (7) that correspond respectively.

2. The piston sealing structure of the novel hydraulic cylinder according to claim 1, characterized in that the extruding device (7) comprises an extruding shell (70) arranged in the annular groove I (5), a through hole (71) communicated with the oil inlet hole (8) is formed in the bottom of the extruding shell (70), two supporting columns (72) are fixedly connected in the extruding shell (70), a sliding plate (73) is arranged on each supporting column (72) in a sliding manner, a spring I (74) is sleeved on each supporting column (72), one end of the spring I (74) is connected with the sliding plate (73), the other end of the spring I (74) is connected with the inner wall of the extruding shell (70), a connecting column (75) is fixedly connected to one side, away from the spring I (74), of the sliding plate (73), and the connecting column (75) penetrates through the outside of the extruding shell (70) and is arranged between the extruding shell (70) in a sliding manner, the connecting column (75) is connected with an arc-shaped pressing plate (76), the arc-shaped pressing plate (76) is connected with the extrusion shell (70) through two springs II (77), and the arc-shaped pressing plate (76) is in contact with the inner wall of the sealing soft sleeve (6).

3. A novel piston sealing structure of a hydraulic cylinder according to claim 2, characterized in that a second annular groove (9) is formed in the middle of the piston (3), a wear-resistant ring (10) is installed in the second annular groove (9), third annular grooves (11) are symmetrically formed in two sides of the second annular groove (9), and a special-shaped sealing ring (12) is installed in the third annular groove (11).

4. A novel piston sealing structure of a hydraulic cylinder according to claim 3, characterized in that an O-ring (13) is arranged between the piston rod (4) and the piston (3), and the O-ring (13) is sleeved on the piston rod (4).

5. A novel piston sealing structure of a hydraulic cylinder according to any one of claims 1-4, characterized in that bearing plates (15) are installed on the left and right sides of the piston (3) through bolts (14).