CN111852987A - High-pressure leakage-proof hydraulic cylinder - Google Patents

High-pressure leakage-proof hydraulic cylinder Download PDF

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Publication number
CN111852987A
CN111852987A CN202010760988.7A CN202010760988A CN111852987A CN 111852987 A CN111852987 A CN 111852987A CN 202010760988 A CN202010760988 A CN 202010760988A CN 111852987 A CN111852987 A CN 111852987A
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CN
China
Prior art keywords
wall
pressure
cavity
hydraulic cylinder
sealing
Prior art date
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Pending
Application number
CN202010760988.7A
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Chinese (zh)
Inventor
王昱
钟俊超
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Foshan Yuren Intelligent Technology Co ltd
Original Assignee
Foshan Yuren Intelligent Technology Co ltd
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Priority to CN202010760988.7A priority Critical patent/CN111852987A/en
Publication of CN111852987A publication Critical patent/CN111852987A/en
Pending legal-status Critical Current

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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
    • 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
    • F15B15/1428—Cylinders
    • 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
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator

Abstract

The invention provides a high-pressure leakage-proof hydraulic cylinder, which comprises a piston rod provided with a piston block, a cylinder body provided with a cavity, a cylinder sleeve comprising an end cover and a sliding wall, wherein the cylinder sleeve is fixed in the cavity, and the end cover is fixed at the upper end of the cylinder body; the upper end of the inner wall of the cavity is hermetically connected with the upper end of the outer wall of the sliding wall, and spaces are formed between the outer walls at the middle part and the lower part of the sliding wall and the inner wall of the cavity; the piston rod penetrates through the end cover and is arranged in the cylinder sleeve and can move up and down in the cylinder sleeve, the piston block is in sealing connection with the cylinder sleeve so as to divide the cylinder sleeve into a working high-pressure cavity and a low-pressure backflow cavity which are isolated from each other, and the piston rod is in sealing connection with the end cover; and the piston rod is provided with a first channel communicated with the working high-pressure cavity and a second channel communicated with the low-pressure return cavity. The invention can solve the problem that the sealing performance of the hydraulic cylinder is poor due to the change of the piston clearance caused by high pressure.

Description

High-pressure leakage-proof hydraulic cylinder
Technical Field
The invention relates to the field of hydraulic cylinder equipment, in particular to a high-pressure leakage-proof hydraulic cylinder.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems.
In the prior art, when the hydraulic cylinder works in a high pressure state, the cylinder body expands outwards due to the high pressure. When the cylinder body is deformed to a certain degree by stress, and the clearance between the cylinder body and the piston exceeds the designed clearance of the sealing element, oil leakage can occur, and the phenomena of extrusion of the sealing element, damage of the sealing groove and the like can be caused in severe cases.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-pressure leakage-proof hydraulic cylinder which can solve the problem that the sealing property of the hydraulic cylinder is poor due to the change of a piston gap caused by high pressure.
The technical scheme of the invention is realized as follows:
a high-pressure leakage-proof hydraulic cylinder comprises a piston rod provided with a piston block, a cylinder body provided with a cavity, an end cover and a cylinder sleeve provided with a sliding wall, wherein the cylinder sleeve is fixed in the cavity, and the end cover is fixed at the upper end of the cylinder body; the upper end of the inner wall of the cavity is hermetically connected with the upper end of the outer wall of the sliding wall, and spaces are formed between the outer walls at the middle part and the lower part of the sliding wall and the inner wall of the cavity; the piston rod penetrates through the end cover and is arranged in the cylinder sleeve and can move up and down in the cylinder sleeve, the piston block is in sealing connection with the cylinder sleeve so as to divide the cylinder sleeve into a working high-pressure cavity and a low-pressure backflow cavity which are isolated from each other, and the piston rod is in sealing connection with the end cover; and the piston rod is provided with a first channel communicated with the working high-pressure cavity and a second channel communicated with the low-pressure return cavity.
Further, the outer side wall of the cylinder body is provided with a steel wire winding groove for winding a steel wire.
Furthermore, a plurality of first grooves are formed in the upper end of the inner wall of the cavity, and first sealing pieces are arranged in the first grooves, so that the upper end of the inner wall of the cavity is in sealing connection with the upper end of the outer wall of the sliding wall.
Furthermore, a through hole for the piston rod to pass through is formed in the end cover, a limit ring with the diameter equivalent to that of the sliding wall is arranged below the through hole, and the limit ring is arranged in the sliding wall; the outer wall of the limiting ring is provided with a plurality of second grooves, and second sealing pieces are arranged in the second grooves, so that the outer wall of the limiting ring is in sealing connection with the inner wall of the sliding wall.
Furthermore, a plurality of third grooves are formed in the inner wall of the through hole, and third sealing elements are arranged in the third grooves, so that the piston rod is connected with the end covers in a sealing mode.
Furthermore, a plurality of fourth grooves are formed in the piston block, and fourth sealing elements are arranged in the fourth grooves, so that the piston block is connected with the inner side of the sliding wall in a sealing mode.
Furthermore, a plurality of fifth grooves are formed in the middle of the through hole, and first wear-resistant rings are arranged in the fifth grooves.
Furthermore, both sides of the fourth sealing element are respectively provided with a sixth groove, and a second wear-resistant ring is arranged in the sixth groove.
Furthermore, a concave table is arranged at the upper end of the cavity, and the cylinder sleeve is fixed on the concave table through screws.
Furthermore, a one-way valve and an overflow valve are arranged on the pipeline connected with the second channel.
Compared with the prior art, the invention has the following advantages: according to the invention, the sliding wall is arranged between the cylinder body and the piston rod, when high-pressure oil enters the working high-pressure cavity from the first channel, because the space is arranged between the middle part and the lower outer wall of the sliding wall and the inner wall of the cavity, the inner wall and the outer wall of the sliding wall can be contacted with the high-pressure oil when the high-pressure oil enters the working high-pressure cavity, and the inward and outward pressures of the sliding wall are automatically balanced, so that the pressure difference between the inner wall and the outer wall of the sliding wall is only the area difference between the two inner and outer surfaces, and because the surface area of the outer wall is larger than that of the inner wall, the resultant force applied to the sliding wall is inward, the sliding wall has an inward tiny deformation tendency under a high-pressure state, the working gap of the sealing element is reduced, and the problem that the sealing property of the hydraulic cylinder is.
The working surfaces of the related sealing elements are arranged on the sliding wall, so that only chromium plating and strengthening treatment are needed to be carried out on the cylinder sleeve, and the cylinder body only needs to be basically processed, so that the weight of parts needing finish machining is greatly reduced, the requirements on machining tools and equipment are greatly reduced in actual production, and the machining cost can be effectively reduced.
The invention can wind steel wires in the steel wire winding groove of the cylinder body, provides inward prestress for balancing stress when the cavity is internally pressurized, thereby reducing the design thickness of the outer cylinder wall.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of one embodiment of a high-pressure leakproof hydraulic cylinder of the present invention;
FIG. 2 is a schematic diagram of an explosion structure of an embodiment of the high-pressure leakproof hydraulic cylinder of the invention;
FIG. 3 is a schematic sectional view of the cylinder;
FIG. 4 is a schematic cross-sectional view of an end cap;
FIG. 5 is a cross-sectional schematic view of a cylinder liner.
The attached drawings are as follows: 1 a piston rod; 101 a piston block; 1011 fourth groove; 1012 a fourth seal; 1013 sixth grooves; 1014 a second wear ring; 102 a first channel; 103 a second channel; 2, a cylinder body; 201 a cavity; 2011 convex ring; 2012 a first groove; 2013 a first seal; 202, a steel wire winding groove; 203 concave platform; 3, end cover; 301 through holes; 3011 a third groove; 3012 a third seal; 3013 a fifth groove; 3014 a first wear ring; 302 a stop collar; 3021 a second recess; 3022 a second seal; 4 cylinder sleeve; 401 a sliding wall; 402 a working high pressure chamber; 403 a low pressure return chamber; 5 a first connecting pipe; 501 a one-way valve; 6 a second connecting pipe; 601 a relief valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-5, the embodiment of the invention discloses a high-pressure leakage-proof hydraulic cylinder, which comprises a piston rod 1 provided with a piston block 101, a cylinder body 2 provided with a cavity 201, an end cover 3 and a cylinder sleeve 4 provided with a sliding wall 401, wherein the cylinder sleeve 4 is fixed in the cavity 201, and the end cover 3 is fixed at the upper end of the cylinder body 2; the upper end of the inner wall of the cavity 201 is hermetically connected with the upper end of the outer wall of the sliding wall 401, and a space is arranged between the middle part and the lower outer wall of the sliding wall 401 and the inner wall of the cavity 201, so that the outer surface of the sliding wall 401 is communicated with the high-pressure oil phase; the piston rod 1 penetrates through the end cover 3 and is arranged in the cylinder sleeve 4 and can move up and down in the cylinder sleeve 4, the piston block 101 is in sealing connection with the cylinder sleeve 4 to divide the cylinder sleeve 4 into a working high-pressure cavity 402 and a low-pressure backflow cavity 403 which are isolated from each other, and the piston rod 1 is in sealing connection with the end cover 3; the piston rod 1 is provided with a first passage 102 communicating with the working high-pressure chamber 402 and a second passage 103 communicating with the low-pressure return chamber 403.
Specifically, the first passage 102 is a common conduit for high pressure oil to enter and for oil to be drained from the chamber during the return stroke of the cylinder, and when the cylinder is pressurized, high pressure oil enters the working high pressure chamber 402 from the first passage 102. When the hydraulic cylinder needs to return, the first channel 102 is directly connected with the oil tank, and the discharged oil flows back to the oil tank; and the second channel 103 is connected with two sets of connecting pipelines, namely a first connecting pipeline 5 and a second connecting pipeline 6, and the hydraulic cylinder is reset for use after high-pressure work is finished. The first connecting pipeline 5 is provided with a one-way valve 501, the second connecting pipeline 6 is provided with an overflow valve 602, and low-pressure oil can supply oil to the return cavity through the one-way valve 501 to realize resetting; when the high-pressure oil works, the oil can flow back to the oil tank from the second connecting pipeline 6 through the overflow valve 602 due to the action of the check valve 501 on the first connecting pipeline 5, wherein the return pressure of the low-pressure return cavity 403 can be adjusted from the overflow valve 602, and when the return pressure is adjusted to be equivalent to the pressure of the high-pressure oil, the pressure balance of the low-pressure return cavity 403 section can be realized.
In the embodiment of the invention, by arranging the sliding wall 401 between the cylinder body 2 and the piston rod 1, when high-pressure oil enters the working high-pressure cavity 402 from the first channel 102, because the middle part and the lower outer wall of the sliding wall 401 are provided with intervals with the inner wall of the cavity 201, the inner wall and the outer wall of the sliding wall 401 can be contacted with the high-pressure oil when the high-pressure oil enters the working high-pressure cavity 402, so that the inward pressure and the outward pressure of the sliding wall 401 are automatically balanced, the pressure of the inner wall and the outer wall of the sliding wall 401 is the same, and Pa is setInner partIs the pressure of the liquid in the sliding wall 401, and PaOuter coverIs the liquid pressure outside the sliding wall 401; sInner partIs the surface area of the wall surface of the inner wall of the sliding wall 401 which is in contact with the high-pressure oil, and SOuter coverFor contact with high-pressure oil in the outer wall of the sliding wall 401Surface area of wall surface of (D), FInner partIs the pressure of the high-pressure oil received by the inner wall of the sliding wall 401 on the inner wall of the sliding wall 401, and SOuter coverThe pressure of the high-pressure oil applied to the outer wall of the sliding wall 401 is
PaInner part＝PaOuter cover
SInner part＜SOuter cover
From the formula pressure formula F ═ Pa × S, it can be seen that
FInner part＜FOuter cover
Therefore, the resultant force applied to the sliding wall 401 is directed inward, so that the sliding wall 401 tends to deform slightly inward under high pressure, and the working gap between the sliding wall 401 and the piston block 101 is reduced, which is more favorable for sealing.
Specifically, as shown in fig. 1 and 3, a convex ring 2011 is provided at the upper end of the inner wall of the cavity 201, so that a certain distance is provided between the middle part and the lower outer wall of the sliding wall 401 and the inner wall of the cavity 201, and thus high-pressure oil can be simultaneously contacted with the inner wall and the outer wall of the sliding wall 401; meanwhile, a plurality of first grooves 2012 are formed in the convex ring 2011, and first sealing elements 2013 are arranged in the first grooves 2012, so that the upper end of the inner wall of the cavity 201 is hermetically connected with the upper end of the outer wall of the sliding wall 401, and high-pressure oil is prevented from overflowing out of the working high-pressure cavity 402.
Specifically, as shown in fig. 1 and 4, the end cap 3 is provided with a through hole 301 through which the piston rod 1 passes, a limit ring 302 having a diameter equivalent to that of the sliding wall 401 is provided below the through hole 301, and the limit ring 302 is provided in the sliding wall 401; a plurality of second grooves 3021 are formed in the outer wall of the limit ring 302, and second sealing elements 3022 are disposed in the second grooves 3021, so that the outer wall of the limit ring 302 is hermetically connected with the inner wall of the sliding wall 401, and low-pressure oil is prevented from overflowing out of the low-pressure return cavity 403.
Specifically, as shown in fig. 1 and 4, a plurality of third grooves 3011 are formed on the inner wall of the through hole 301, and third sealing elements 3012 are disposed in the third grooves 3011, so as to seal and connect the piston rod 1 and the end cover 3, and prevent the low-pressure oil in the low-pressure return cavity 403 from overflowing out of the end cover 3.
Specifically, as shown in fig. 1 and 2, a plurality of fourth grooves 1011 are formed in the piston block 101, and fourth sealing members 1012 are disposed in the fourth grooves 1011, so that the piston block 101 is hermetically connected to the inner side of the sliding wall 401, and the working high-pressure chamber 402 and the low-pressure return chamber 403 are isolated from each other, thereby providing a good sealing performance.
In the embodiment of the present invention, the first seal 2013, the second seal 3022, the third seal 3012 and the fourth seal 1012 have good effect on ensuring the sealing of the working high-pressure cavity 402 and the low-pressure return cavity 403, while the working surfaces of the second seal 3022 and the fourth seal 1012 are arranged on the inner surface of the sliding wall 401, and because the resultant force applied to the sliding wall 401 is inward, the sliding wall 401 has a tendency of inward slight deformation in a high-pressure state, so that the gap between the second seal 3022 and the fourth seal 1012 is reduced, and the problem of poor sealing performance of the hydraulic cylinder caused by the change of the piston gap due to high pressure is solved.
In the embodiment of the present invention, the number of the first seal 2013, the second seal 3022, and the third seal 3012 is 2 or more.
Further, as shown in fig. 4, a plurality of fifth grooves 3013 are formed in the middle of the through hole 301, and a first wear-resistant ring 3014 is disposed in the fifth groove 3013. When the piston rod 1 extends and retracts in the sliding wall 401, due to the existence of the first wear-resistant ring 3014, the movement of the piston rod 1 can be guided, the third sealing piece 3012 is prevented from being worn too fast, and therefore the service life of the hydraulic cylinder is prolonged. Preferably, third seals 3012 are provided above and below the first wear ring 3014 to provide sealing.
As shown in fig. 1 and 2, the sidewall of the piston block 101 is also provided with a sixth groove 1013, and a second wear-resistant ring 1014 is provided in the sixth groove 1013, so that when the piston rod 1 extends and contracts in the sliding wall 401, due to the second wear-resistant ring 1014, the movement of the piston block 101 can be guided, and the fourth sealing member 1012 is prevented from being worn too fast, thereby prolonging the service life of the hydraulic cylinder. Preferably, the fourth seal 1012 is located in the middle of the piston block 101, and second wear rings 1014 are located on the piston block 101 above and below the fourth seal 1012 to protect the fourth seal.
Further, the upper end of the cavity 201 is provided with a concave table 203, and the cylinder sleeve 4 is fixed on the concave table 203 through screws; and the end cap 3 may be fixed to the upper end of the cylinder 2 by screws. Specifically, screw holes are uniformly formed around the edge of the end cover 3, around the upper edge of the cylinder sleeve 4 and at the upper edge of the cylinder body 2, and are used for fixing the end cover 3, the cylinder sleeve 4 and the cylinder body 2 to each other.
Further, as shown in fig. 1 and 2, the outer side wall of the cylinder block 2 is provided with a wire winding groove 202 for winding a wire, and the wire winding groove 202 may be wound with a wire to provide an inward prestress to the cylinder block 2 for balancing stress when the inside of the cavity 201 is pressurized, so that the design thickness of the outer cylinder wall may be reduced.
In the embodiment of the invention, the arrangement of the cylinder sleeve 4 solves the problem that the sealing property of the hydraulic cylinder is poor due to the change of a piston clearance caused by high pressure, and the winding steel wire provides inward prestress for the cylinder body 2, so that the hydraulic cylinder can bear high-pressure oil with higher pressure; the hydraulic cylinder has smaller volume than that of the existing hydraulic cylinder, so that the hydraulic cylinder is convenient to reduce the volume, is convenient to install and carry, and is suitable for various scenes.
In summary, by providing a sliding wall 401 between the cylinder 2 and the piston rod 1, when the high-pressure oil enters the working high-pressure chamber 402 from the first passage 102, because the middle and lower outer walls of the sliding wall 401 are spaced from the inner wall of the cavity 201, therefore, the inner wall and the outer wall of the sliding wall 401 are in contact with the high-pressure oil when the high-pressure oil enters the working high-pressure chamber 402, the inward and outward pressures of the sliding wall 401 are automatically balanced, the pressure difference between the inner wall and the outer wall of the sliding wall 401 is only the area difference between the two inner and outer surfaces, since the surface area of the outer wall is greater than the surface area of the inner wall, the resultant force experienced by the sliding wall 401 is inward, therefore, the sliding wall 401 has a tendency of inward micro deformation under a high pressure state, so that the working clearance of the sealing element is reduced, and the problem that the sealing performance of the hydraulic cylinder is reduced due to the change of the piston clearance caused by the high pressure is solved.
The working surfaces of the related sealing elements are arranged on the sliding wall 401, so that only the chromium plating and strengthening treatment is needed to be carried out on the cylinder sleeve 4, and only the basic processing is needed to be carried out on the cylinder body 2, thereby greatly reducing the processing cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A high-pressure leakage-proof hydraulic cylinder comprises a piston rod provided with a piston block and a cylinder body provided with a cavity, and is characterized by also comprising an end cover and a cylinder sleeve provided with a sliding wall, wherein the cylinder sleeve is fixed in the cavity, and the end cover is fixed at the upper end of the cylinder body; the upper end of the inner wall of the cavity is hermetically connected with the upper end of the outer wall of the sliding wall, and spaces are formed between the outer walls at the middle part and the lower part of the sliding wall and the inner wall of the cavity; the piston rod penetrates through the end cover and is arranged in the cylinder sleeve and can move up and down in the cylinder sleeve, the piston block is in sealing connection with the cylinder sleeve so as to divide the cylinder sleeve into a working high-pressure cavity and a low-pressure backflow cavity which are isolated from each other, and the piston rod is in sealing connection with the end cover; and the piston rod is provided with a first channel communicated with the working high-pressure cavity and a second channel communicated with the low-pressure return cavity.
2. The high-pressure leakproof hydraulic cylinder according to claim 1, wherein the outer side wall of the cylinder body is provided with a steel wire winding groove for winding a steel wire.
3. The high-pressure leakproof hydraulic cylinder according to claim 1, wherein a plurality of first grooves are formed in the upper end of the inner wall of the cavity, and first sealing members are arranged in the first grooves, so that the upper end of the inner wall of the cavity is in sealing connection with the upper end of the outer wall of the sliding wall.
4. The high-pressure leakage-proof hydraulic cylinder as claimed in claim 1, wherein the end cap is provided with a through hole for the piston rod to pass through, a limit ring with a diameter equivalent to that of the sliding wall is arranged below the through hole, and the limit ring is arranged in the sliding wall; the outer wall of the limiting ring is provided with a plurality of second grooves, and second sealing pieces are arranged in the second grooves, so that the outer wall of the limiting ring is in sealing connection with the inner wall of the sliding wall.
5. The high-pressure leakage-proof hydraulic cylinder according to claim 4, wherein a plurality of third grooves are formed on the inner wall of the through hole, and third sealing elements are arranged in the third grooves, so that the piston rod and the end cover are connected in a sealing manner.
6. The high-pressure leakproof hydraulic cylinder according to claim 1, wherein the piston block is provided with a plurality of fourth grooves, and a fourth sealing element is arranged in each fourth groove, so that the piston block is in sealing connection with the inner side of the sliding wall.
7. The high-pressure leakproof hydraulic cylinder according to claim 5, wherein a plurality of fifth grooves are formed in the middle of the through hole, and a first wear-resistant ring is arranged in each fifth groove.
8. The high-pressure, leak-proof hydraulic cylinder of claim 6, wherein a sixth groove is formed on each side of the fourth sealing member, and a second wear ring is disposed in the sixth groove.
9. The high-pressure leakage-proof hydraulic cylinder as claimed in claim 1, wherein a concave platform is arranged at the upper end of the cavity, and the cylinder sleeve is fixed on the concave platform through screws.
10. The high-pressure leakage-proof hydraulic cylinder according to claim 1, wherein a check valve and an overflow valve are provided on a pipe connected to the second passage.
CN202010760988.7A 2020-07-31 2020-07-31 High-pressure leakage-proof hydraulic cylinder Pending CN111852987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010760988.7A CN111852987A (en) 2020-07-31 2020-07-31 High-pressure leakage-proof hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010760988.7A CN111852987A (en) 2020-07-31 2020-07-31 High-pressure leakage-proof hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN111852987A true CN111852987A (en) 2020-10-30

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Application Number Title Priority Date Filing Date
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920030A1 (en) * 1988-06-25 1989-12-28 Zahnradfabrik Friedrichshafen Hydraulic energy-storage system
CN202390148U (en) * 2011-12-08 2012-08-22 福建华橡自控技术股份有限公司 Hydraulic cylinder of high-pressure double-acting jack
CN207212833U (en) * 2017-09-29 2018-04-10 泸州市长江液压件装备有限公司 A kind of hydraulic cylinder protection device
CN208845441U (en) * 2018-10-17 2019-05-10 天津市鑫联建辉金属制品有限公司 High-pressure piston type accumulator cylinder body
CN209430525U (en) * 2019-01-11 2019-09-24 浙江工业职业技术学院 A kind of hydraulic cylinder bolt device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920030A1 (en) * 1988-06-25 1989-12-28 Zahnradfabrik Friedrichshafen Hydraulic energy-storage system
CN202390148U (en) * 2011-12-08 2012-08-22 福建华橡自控技术股份有限公司 Hydraulic cylinder of high-pressure double-acting jack
CN207212833U (en) * 2017-09-29 2018-04-10 泸州市长江液压件装备有限公司 A kind of hydraulic cylinder protection device
CN208845441U (en) * 2018-10-17 2019-05-10 天津市鑫联建辉金属制品有限公司 High-pressure piston type accumulator cylinder body
CN209430525U (en) * 2019-01-11 2019-09-24 浙江工业职业技术学院 A kind of hydraulic cylinder bolt device

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