CN112879384B - Ultra-high pressure oil cylinder for compensating sealing gap by annular groove structure - Google Patents
Ultra-high pressure oil cylinder for compensating sealing gap by annular groove structure Download PDFInfo
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- CN112879384B CN112879384B CN202110044608.4A CN202110044608A CN112879384B CN 112879384 B CN112879384 B CN 112879384B CN 202110044608 A CN202110044608 A CN 202110044608A CN 112879384 B CN112879384 B CN 112879384B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/17—Characterised by the construction of the motor unit of the straight-cylinder type of differential-piston type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1433—End caps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1476—Special return means
Abstract
The invention discloses an ultra-high pressure oil cylinder for compensating a sealing gap by utilizing an annular groove structure, and relates to the technical field of ultra-high pressure oil cylinder design; in particular to a sealing gap of an ultrahigh pressure oil cylinder with the working pressure of 60-100MPa, which is compensated by an annular groove structure. The piston and the piston rod are of an integrated structure and are arranged in the cylinder body; the cylinder cover is sleeved on the piston rod and fixed on the cylinder body through bolts, and the piston is packaged in the cylinder body; an oil port A communicated with the interior of the cylinder body is formed in the cylinder body; an oil port B communicated with the interior of the cylinder body is formed in the cylinder cover; the piston is provided with an annular groove A and an annular groove B; a piston sealing structure is arranged on the side wall of the piston; an annular groove C is formed in the cylinder cover; a piston rod sealing structure is arranged on the inner wall of the cylinder cover; a piston rod sealing oil drain structure is arranged in the cylinder cover; the piston and the piston rod are internally provided with a piston sealing oil drainage structure. The technical scheme of the invention solves the problem that the gap between the cylinder body and the piston is increased and the sealing is easy to lose efficacy due to the fact that the expansion amount of the cylinder body is larger than the expansion amount of the piston under the ultrahigh pressure in the prior art.
Description
Technical Field
The invention discloses an ultra-high pressure oil cylinder for compensating a sealing gap by utilizing an annular groove structure, and relates to the technical field of ultra-high pressure oil cylinder design; in particular to a sealing gap of an ultrahigh pressure oil cylinder with the working pressure of 60-100MPa, which is compensated by an annular groove structure.
Background
With increasing tonnage of pressure equipment, the demand for an ultra-high pressure oil cylinder capable of stably working is becoming wider. However, under the ultrahigh working pressure (60-100 MPa), the expansion amount of the cylinder body of the oil cylinder is large, the possibility of damage of the sealing due to the extrusion effect is obviously large, the sealing performance of the piston and the cylinder cover cannot be ensured, internal leakage and external leakage are extremely easy to occur, and the service life and the working stability of the hydraulic cylinder are influenced.
The invention patent with a sealing gap adjusting structure applied by Tianjin heavy equipment engineering research Co-Ltd in the prior art is a hydraulic cylinder device, when high-pressure oil is introduced to the side of a hydraulic cylinder plug, an adjusting high-pressure cavity and a high-pressure ring cavity on the piston can synchronously expand and contract along with the expansion and contraction of a cylinder body under the action of the high-pressure oil, so that the sealing gap between the piston and the cylinder body is effectively reduced, and the sealing performance is improved. The patent only enables the high-pressure ring cavity to expand outwards to compensate the clearance when the plug cavity is communicated with high pressure and the rod cavity is returned with low pressure. However, when the rod cavity is communicated with high pressure and the plug cavity is subjected to low pressure oil return, the gap at one side of the piston seal rod cavity is high pressure, the high pressure cavity and the high pressure ring cavity are adjusted to be subjected to low pressure oil return, the gap is increased due to the adduction of the piston under the action of pressure, and the sealing is easy to fail; when the rod cavity and the plug cavity are simultaneously communicated with high pressure, gaps between the piston and the cylinder body and the high pressure cavity are adjusted to be high pressure, as the diameter of the piston is larger than that of the high pressure cavity, the area of the pressure oil acting on the outer circle of the piston is larger than that of the high pressure cavity, the piston adduction is caused, the gaps are increased, and the sealing is easy to lose efficacy.
Aiming at the problems in the prior art, the novel ultrahigh pressure oil cylinder which utilizes the annular groove structure to compensate the sealing gap is researched and designed, so that the problems in the prior art are overcome.
Disclosure of Invention
According to the technical problem that when the rod cavity is filled with oil and the rod cavity is plugged with the rod cavity and the piston is retracted simultaneously, the gap is increased, and the sealing is easy to fail. The invention mainly adopts the annular groove structure which is additionally arranged on the piston and the cylinder cover, thereby realizing the compensation of the sealing clearance between the piston and the cylinder body as well as between the piston rod and the cylinder cover and achieving the effect of preventing the sealing failure.
According to the invention, the annular grooves are respectively arranged on the upper end surface and the lower end surface of the piston, no matter the piston cavity is communicated with high pressure or the rod cavity is communicated with high pressure, the annular grooves can generate outward expansion force under the action of pressure, and the pressure of a gap between the piston and the cylinder body is unloaded through the oil drain groove and the oil drain hole, so that the piston generates elastic deformation close to the inner wall of the cylinder body, the sealing gap between the piston and the cylinder body is compensated, the gap is kept within an allowable range, the main seal of the piston is always tightly attached to the inner wall of the cylinder body, the sealing performance is improved, and the risk that the main seal of the piston is extruded into the gap is reduced.
Meanwhile, the annular groove is also arranged on the cylinder cover, when the rod cavity is filled with oil, the annular groove generates inward expansion force under the action of pressure, and the pressure of a gap between the piston rod and the cylinder cover is unloaded through the oil drain groove and the oil drain hole, so that the cylinder cover generates elastic deformation close to the piston rod, the sealing gap between the cylinder cover and the piston rod is compensated, the gap is kept within an allowable range, the piston rod seal is tightly attached to the piston rod all the time, the sealing performance is improved, and the risk that the piston rod seal is extruded into the gap is reduced.
The invention adopts the following technical means:
an ultra-high pressure cylinder for compensating a seal gap using an annular groove structure, comprising: the piston, the piston rod, the cylinder body and the cylinder cover; the piston and the piston rod are of an integrated structure and are arranged in the cylinder body; the cylinder cover is sleeved on the piston rod and fixed on the cylinder body through bolts, and the piston is packaged in the cylinder body; an oil port A communicated with the interior of the cylinder body is formed in the cylinder body; an oil port B communicated with the interior of the cylinder body is formed in the cylinder cover;
further, an annular groove A and an annular groove B are formed in the piston;
further, a piston sealing structure is arranged on the side wall of the piston;
further, an annular groove C is formed in the cylinder cover;
further, a piston rod sealing structure is arranged on the inner wall of the cylinder cover;
further, a piston rod sealing oil drain structure is arranged in the cylinder cover;
further, the piston and the piston rod are internally provided with a piston sealing oil drain structure.
Further, the annular groove A and the annular groove B have the same structure and are symmetrically arranged at the positions of the upper end surface and the lower end surface of the piston, which are close to the outer side wall;
further, the cross section of the annular groove A and the annular groove B is one of rectangle, trapezoid and other geometric shapes.
Further, the piston sealing structure includes: piston seal A, guide belt B and piston seal B;
further, the piston seal A, the guide belt B and the piston seal B are symmetrically arranged in the annular mounting groove on the outer wall of the piston up and down to form a piston seal structure together.
Further, the annular groove C is arranged at the position, close to the inner side wall, of the upper end face of the cylinder cover;
further, the annular groove C has a cross-section of one of rectangular, trapezoidal and other geometric shapes.
Further, the piston rod sealing structure includes: the piston rod is arranged in each annular mounting groove on the inner wall of the cylinder cover from top to bottom, and comprises a seal, a guide belt C, a guide belt D and a dust ring.
Further, the piston seal oil drain structure includes: oil drain groove A, oil drain hole B and oil drain hole C;
further, the oil drain groove A is an annular groove body and is arranged on the outer wall of the piston;
further, the oil drain hole C is arranged on the piston rod, the top end of the oil drain hole C is higher than the horizontal height of the oil drain groove A, and the bottom end of the oil drain hole C is communicated with the outside through the bottom end face of the piston rod;
further, the number of the oil drain holes B is N, and the oil drain holes B are horizontally, radially and uniformly distributed in the piston by taking the center of the piston as the center;
further, one end of the oil drain hole B is communicated with the oil drain groove A, and the other end of the oil drain hole B is communicated with the oil drain hole C.
Further, the piston rod seal oil drainage structure includes: an oil drain hole D and an oil drain groove B;
further, the oil drain groove B is an annular groove body and is arranged on the inner wall of the cylinder cover;
further, the oil drain hole D is horizontally and radially penetrated in the cylinder cover, one end of the oil drain hole D is communicated with the oil drain groove B, and the other end of the oil drain hole D is communicated with the outside of the cylinder cover.
The working process of the invention is as follows:
when high-pressure oil (60-100 MPa) enters the plug cavity from the oil port A, the inside of the plug cavity and the annular groove A are filled with high-pressure oil. Under the action of pressure oil, the expansion size of the cylinder body is larger than that of the piston due to the fact that the thickness of the cylinder body is larger than the diameter of the piston, the gap between the cylinder body and the piston is increased, and the sealing performance is reduced. The high-pressure oil fills the annular groove A on the side end surface of the piston plug cavity, the annular groove A generates outward expansion force under the action of pressure, and the pressure of a gap between the piston and the cylinder body is unloaded through the oil drain groove A, the oil drain hole B and the oil drain hole C, so that the piston generates elastic deformation close to the inner wall of the cylinder body, the sealing gap between the piston and the cylinder body is compensated, the gap is kept within an allowable range, the piston main seal A is always tightly attached to the inner wall of the cylinder body, the sealing performance is improved, and the risk that the piston main seal A is extruded into the gap is reduced.
Similarly, when high-pressure oil (60-100 MPa) enters the rod cavity from the oil port B, the interior of the rod cavity and the annular groove B are filled with high-pressure oil. Under the action of pressure oil, the expansion size of the cylinder body is larger than that of the piston due to the fact that the thickness of the cylinder body is larger than the diameter of the piston, the gap between the cylinder body and the piston is increased, and the sealing performance is reduced. The high-pressure oil fills the annular groove B on the side end surface of the piston rod cavity, the annular groove B generates outward expansion force under the action of pressure, and the pressure of a gap between the piston and the cylinder body is unloaded through the oil drain groove A, the oil drain hole B and the oil drain hole C, so that the piston generates elastic deformation close to the inner wall of the cylinder body, the sealing gap between the piston and the cylinder body is compensated, the gap is kept within an allowable range, the piston main seal B is always tightly attached to the inner wall of the cylinder body, the sealing performance is improved, and the risk that the piston main seal B is extruded into the gap is reduced.
Similarly, when high-pressure oil (60-100 MPa) enters the plug cavity and the rod cavity from the oil port A and the oil port B simultaneously, the plug cavity, the rod cavity and the annular grooves A and B are filled with high-pressure oil. Under the action of pressure oil, the expansion size of the cylinder body is larger than that of the piston due to the fact that the thickness of the cylinder body is larger than the diameter of the piston, the gap between the cylinder body and the piston is increased, and the sealing performance is reduced. The high-pressure oil fills the piston plug cavity and the annular grooves A and B on the side end surfaces of the rod cavity simultaneously, the annular grooves A and B generate outward expansion force under the action of pressure, and the pressure of a gap between the piston and the cylinder body is unloaded through the oil drain groove A, the oil drain hole B and the oil drain hole C, so that the piston generates elastic deformation close to the inner wall of the cylinder body, the sealing gap between the piston and the cylinder body is compensated, the gap is kept in an allowable range, the main seals A and B of the piston are always tightly attached to the inner wall of the cylinder body, the sealing performance is improved, and the risk that the main seals A and B of the piston are extruded into the gap is reduced.
The oil drain groove A is communicated with the outside of the cylinder through the oil drain hole B and the oil drain hole C, and when a large amount of oil flows out from the oil drain hole C, the failure of the piston main seal A or the piston main seal B can be judged, and the piston main seal B should be replaced in time.
When high-pressure oil (60-100 MPa) enters the rod cavity from the oil port B, the interior of the rod cavity and the annular groove C are filled with high-pressure oil. Under the action of pressure, the cylinder body expands outwards to drive the cylinder cover to expand outwards, and meanwhile, the piston rod is compressed, so that the gap between the cylinder cover and the piston rod is increased, and the sealing performance is reduced. The high-pressure oil fills the annular groove C on the inner side end surface of the cylinder cover, the annular groove C generates inward tension under the action of pressure, and the pressure of a gap between the piston rod and the cylinder cover is unloaded through the oil drain groove B and the oil drain hole D, so that the cylinder cover generates elastic deformation close to the piston rod, the sealing gap between the cylinder cover and the piston rod is compensated, the gap is kept in an allowable range, the piston rod is always tightly attached to the piston rod in a sealing way, the sealing performance is improved, and the risk that the piston rod is squeezed into the gap in a sealing way is reduced.
The oil drain groove B is communicated with the outside of the cylinder through an oil drain hole D, and when a large amount of oil flows out from the oil drain hole D, the sealing failure of the piston rod can be judged and the piston rod should be replaced in time.
Compared with the prior art, the invention has the following advantages:
1. the ultrahigh-pressure oil cylinder utilizing the annular groove structure to compensate the sealing gap provided by the invention utilizes the annular groove to compensate the sealing gap between the piston and the cylinder body as well as between the piston rod and the cylinder cover, and the greater the working pressure is, the better the compensation effect is and the better the sealing effect is;
2. the ultrahigh pressure oil cylinder utilizing the annular groove structure to compensate the sealing gap can realize the compensation of the sealing gap between the piston and the cylinder body when the oil is fed into the plug cavity, the oil is fed into the rod cavity and the rod cavity of the plug cavity at the same time, and the existing sealing gap adjusting structure can only realize the compensation of the sealing gap when the oil is fed into the plug cavity;
3. the ultrahigh pressure oil cylinder utilizing the annular groove structure to compensate the sealing gap can realize the compensation of the sealing gap between the piston rod and the cylinder cover during the oil feeding of the rod cavity, and reduce the risk of oil leakage outside the oil liquid
4. The ultrahigh pressure oil cylinder utilizing the annular groove structure to compensate the sealing gap is respectively provided with the piston seal and the oil drain hole of the piston rod seal, and whether the sealing is invalid can be judged by observing whether oil flows out of the oil drain hole.
In conclusion, the technical scheme of the invention solves the problems that in the prior art, when the oil is fed into the rod cavity and the oil is fed into the rod cavity plug cavity simultaneously, the clearance is increased and the sealing is easy to fail.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of the structure of a conventional ultra-high pressure cylinder. .
In the figure: 1. oil port A2, piston 3, annular groove A4, piston seal A5, guide belt A6, drain groove A7, guide belt B8, piston seal B9, annular groove B10, drain hole B11, cylinder block 12, piston rod 13, annular groove C14, oil port B15, drain hole D16, piston rod seal 17, guide belt C18, guide belt D19, drain groove B20, dust ring 21, cylinder head 22, drain hole C.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in the figure, the invention provides an ultra-high pressure oil cylinder for compensating a sealing gap by utilizing an annular groove structure, which comprises the following components: a piston 2, a piston rod 12, a cylinder 11 and a cylinder head 21; the piston 2 and the piston rod 12 are of an integrated structure and are arranged in the cylinder body 11; the cylinder cover 21 is sleeved on the piston rod 12 and is fixed on the cylinder body by bolts, and the piston 2 is encapsulated in the cylinder body 11; an oil port A1 communicated with the interior of the cylinder body 11 is formed in the cylinder body 11; the cylinder cover 21 is provided with an oil port B14 communicated with the interior of the cylinder body 11; the piston 2 is provided with an annular groove A3 and an annular groove B9; a piston sealing structure is arranged on the side wall of the piston 2; the cylinder cover 21 is provided with an annular groove C13; a piston rod sealing structure is arranged on the inner wall of the cylinder cover 21; a piston rod sealing oil drain structure is arranged in the cylinder cover 21; the piston 2 and the piston rod 12 are provided with a piston seal oil drain structure in common.
The annular groove A3 and the annular groove B9 have the same structure and are symmetrically arranged at the positions of the upper end surface and the lower end surface of the piston 2, which are close to the outer side wall; the annular grooves A3 and B9 are rectangular, trapezoidal or any other geometric shape in cross section.
The piston seal structure includes: piston seal A4, guide belt A5, guide belt B7, and piston seal B8; the piston seal A4, the guide belt A5, the guide belt B7 and the piston seal B8 are symmetrically arranged in the annular mounting groove on the outer wall of the piston 2 up and down, and form a piston seal structure together.
The annular groove C13 is arranged at a position, close to the inner side wall, of the upper end surface of the cylinder cover 21; the annular groove C13 is one of rectangular, trapezoidal and other geometric shapes in cross section.
The piston rod seal structure includes: the piston rod seal 16, the guide belt C17, the guide belt D18 and the dust ring 20 are arranged in annular mounting grooves on the inner wall of the cylinder cover 21 from top to bottom.
The piston seal oil drainage structure includes: oil drain groove A6, oil drain hole B10, and oil drain hole C22; the oil drain groove A6 is an annular groove body and is arranged on the outer wall of the piston 2; the oil drain hole C22 is arranged on the piston rod 12, the top end of the oil drain hole C22 is higher than the horizontal height of the oil drain groove A6, and the bottom end of the oil drain hole C22 is communicated with the outside through the bottom end face of the piston rod 12; the number of the oil leakage holes B10 is N, and the oil leakage holes B are horizontally, radially and uniformly distributed in the piston 2 by taking the center of the circle of the piston 2 as the center; one end of the oil drain hole B10 is communicated with the oil drain groove A6, and the other end is communicated with the oil drain hole C22.
The sealed oil drainage structure of piston rod includes: an oil drain hole D15 and an oil drain groove B19; the oil drain groove B19 is an annular groove body and is arranged on the inner wall of the cylinder cover 21; the oil drain hole 15 is horizontally and radially penetrating through the cylinder cover 21, one end of the oil drain hole is communicated with the oil drain groove B19, and the other end of the oil drain hole is communicated with the outside of the cylinder cover 21.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. An ultra-high pressure cylinder for compensating a seal gap using an annular groove structure, comprising: a piston (2), a piston rod (12), a cylinder body (11) and a cylinder cover (21); the piston (2) and the piston rod (12) are of an integrated structure and are arranged in the cylinder body (11); the cylinder cover (21) is sleeved on the piston rod (12) and is fixed on the cylinder body (11) through bolts, and the piston (2) is packaged in the cylinder body (11); an oil port A (1) communicated with the interior of the cylinder body (11) is formed in the cylinder body (11); an oil port B (14) communicated with the interior of the cylinder body (11) is formed in the cylinder cover (21); the method is characterized in that:
an annular groove A (3) and an annular groove B (9) are arranged on the piston (2);
a piston sealing structure is arranged on the side wall of the piston (2);
an annular groove C (13) is formed in the cylinder cover (21);
a piston rod sealing structure is arranged on the inner wall of the cylinder cover (21);
a piston rod sealing oil drain structure is arranged in the cylinder cover (21);
the piston (2) and the piston rod (12) are internally provided with a piston sealing oil draining structure.
2. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the annular groove A (3) and the annular groove B (9) have the same structure and are symmetrically arranged at the positions of the upper end face and the lower end face of the piston (2) close to the outer side wall;
the cross sections of the annular grooves A (3) and the annular grooves B (9) are rectangular, trapezoidal or in other geometric shapes.
3. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the piston sealing structure comprises: piston seal A (4), guide belt A (5), guide belt B (7) and piston seal B (8);
the piston seal A (4) and the guide belt A (5), the guide belt B (7) and the piston seal B (8) are vertically symmetrically arranged in an annular mounting groove on the outer wall of the piston (2) to form a piston sealing structure together.
4. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the annular groove C (13) is arranged at the position, close to the inner side wall, of the upper end face of the cylinder cover (21);
the cross section of the annular groove C (13) is one of rectangle, trapezoid and other geometric shapes.
5. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the piston rod sealing structure includes: the piston rod sealing device comprises a piston rod sealing device (16), a guide belt C (17), a guide belt D (18) and a dust ring (20), wherein the piston rod sealing device is arranged in each annular mounting groove on the inner wall of a cylinder cover (21) from top to bottom.
6. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the piston seal oil drainage structure includes: an oil drain groove A (6), an oil drain hole B (10) and an oil drain hole C (22);
the oil drain groove A (6) is an annular groove body and is arranged on the outer wall of the piston (2);
the oil drain hole C (22) is arranged on the piston rod (12), the top end of the oil drain hole C (22) is higher than the horizontal height of the oil drain groove A (6), and the bottom end of the oil drain hole C is communicated with the outside through the bottom end face of the piston rod (12);
the number of the oil drain holes B (10) is N, and the oil drain holes B are horizontally, radially and uniformly distributed in the piston (2) by taking the center of the piston (2) as the center;
one end of the oil drain hole B (10) is communicated with the oil drain groove A (6), and the other end is communicated with the oil drain hole C (22).
7. The ultra-high pressure cylinder for compensating a sealing gap by using an annular groove structure as claimed in claim 1, wherein:
the sealed oil drainage structure of piston rod include: an oil drain hole D (15) and an oil drain groove B (19);
the oil drain groove B (19) is an annular groove body and is arranged on the inner wall of the cylinder cover (21);
the oil drain hole D (15) is horizontally and radially arranged inside the cylinder cover (21) in a penetrating way, one end of the oil drain hole D is communicated with the oil drain groove B (19), and the other end of the oil drain hole D is communicated with the outside of the cylinder cover (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110044608.4A CN112879384B (en) | 2021-01-13 | 2021-01-13 | Ultra-high pressure oil cylinder for compensating sealing gap by annular groove structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110044608.4A CN112879384B (en) | 2021-01-13 | 2021-01-13 | Ultra-high pressure oil cylinder for compensating sealing gap by annular groove structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112879384A CN112879384A (en) | 2021-06-01 |
| CN112879384B true CN112879384B (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110044608.4A Active CN112879384B (en) | 2021-01-13 | 2021-01-13 | Ultra-high pressure oil cylinder for compensating sealing gap by annular groove structure |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3390616A (en) * | 1965-10-19 | 1968-07-02 | William L. Hammer | Fluid pressure cylinders having load responsive piston valves |
| DE2847274C2 (en) * | 1978-10-31 | 1983-01-27 | Fa. Carl Freudenberg, 6940 Weinheim | Piston for a working cylinder |
| DE4133188A1 (en) * | 1990-10-08 | 1992-04-09 | Zahnradfabrik Friedrichshafen | Sealing unit for pressurised chambers, - is esp. used with pistons and piston rods and consists of sealing rings with leakage chamber between and leakage pipe |
| DE102017000857A1 (en) * | 2017-01-31 | 2018-08-02 | Liebherr-Components Kirchdorf GmbH | A cylinder piston device |
| CN107218266A (en) * | 2017-07-27 | 2017-09-29 | 攀枝花学院 | Ultrahigh pressure cylinder sealing structure |
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2021
- 2021-01-13 CN CN202110044608.4A patent/CN112879384B/en active Active
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