CN110118211B - Square cylinder and sealing ring and sealing structure used in square cylinder - Google Patents
Square cylinder and sealing ring and sealing structure used in square cylinder Download PDFInfo
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- CN110118211B CN110118211B CN201910449817.XA CN201910449817A CN110118211B CN 110118211 B CN110118211 B CN 110118211B CN 201910449817 A CN201910449817 A CN 201910449817A CN 110118211 B CN110118211 B CN 110118211B
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- 238000007789 sealing Methods 0.000 title claims abstract description 461
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 79
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 10
- 239000000057 synthetic resin Substances 0.000 claims description 10
- 229920003002 synthetic resin Polymers 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Classifications
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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
- F15B15/1428—Cylinders
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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
-
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
Abstract
The invention provides a square cylinder, and a sealing ring and a sealing structure used in the square cylinder. The square cylinder device comprises a cylinder body, a piston rod and a sealing structure arranged between the piston and the cylinder body, wherein the cross section of the cylinder body is square, the sealing structure comprises a first sealing bag ring and a second sealing bag ring which are arranged at the upper part and the lower part of the piston, a third sealing bag ring is arranged at the opening of the cylinder body, annular sealing grooves are correspondingly formed in the outer wall of the piston and the opening of the cylinder body, the sealing bag rings are respectively embedded into the corresponding annular sealing grooves and are in contact with the inner wall of the grooves, the inner groove surface of each sealing groove is communicated with the cylinder body of the cylinder, and when hydraulic oil is injected under pressure, the corresponding sealing bag ring is pressed by injecting the hydraulic oil into the inner groove surface of the sealing groove, so that the piston and the cylinder body are sealed. The sealing method is reliable, solves the problems of uneven contact pressure of the sealing element and easy damage and sealing of the square cylinder, and can enable the square cylinder to replace a cylinder in a specific occasion.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure, relates to a hydraulic cylinder, and particularly relates to a square cylinder, and a sealing ring and a sealing structure used in the square cylinder.
Background
The hydraulic oil cylinder converts the hydraulic energy of a liquid medium enclosed in the oil cylinder into mechanical energy, so that load is applied to a pressed object, and the hydraulic oil cylinder has wide application. With the development of national economy and the requirement of engineering construction, a large-output oil cylinder and a square piston are required in specific occasions, but at present, all the hydraulic oil cylinders are cylindrical, the piston rods are round, the piston rods are converted into square bodies, the size of the oil cylinder is increased, or steel plates are padded, friction loss and uneven stress of objects can be generated. The square cylinder and the square piston can improve rated output, avoid output loss and lead the object to be stressed uniformly. The sealing mode and the sealing material directly influence the performance of the oil cylinder.
The cylinder body and the piston of the common cylinder are generally sealed by self-sealing, and are respectively pressed and sealed by lip-shaped sealing pieces, and the sealing pieces are annular. The extrusion sealing is to generate contact pressure between the sealing element and the inner side wall of the cylinder body, which is increased along with the increase of the pressure of the hydraulic oil in the cylinder body, by the precompression force of the sealing element and the compression force of the pressure of the hydraulic oil in the cylinder body, so that the sealing ring is worn in on the sealing surface to seal the leakage channel between the piston and the side wall of the cylinder body to achieve sealing; the self-sealing lip seal is to make initial sealing by utilizing the counterforce generated by the deformation of the sealing ring, and under the action of a liquid working medium, the lip edge of the sealing ring is propped open to be tightly attached to a sealed surface, and the contact pressure of the lip seal is increased along with the increase of the working pressure so as to achieve the self-sealing effect. The extrusion sealing piece is provided with an O-shaped sealing ring, a square sealing ring, an X-shaped sealing ring and the like, and the lip-shaped sealing piece is provided with a V-shaped sealing ring, a U-shaped sealing ring, a Y-shaped sealing ring and the like.
By initially sealing the seal member with the precompression force and the reaction force generated by the deformation of the seal ring itself, the contact pressure and the seal member deformation are often uneven, and the durability is deteriorated. Because of the corner that exists between square body cylinder, the square body piston, directly adopt extrusion seal or self-sealing lip seal to seal between square body cylinder and the square body piston, because of the existence of corner, sealing washer initial seal pressure can not make sealing washer and sealed face effective closely laminating, and the friction is great, and wearing and tearing are serious, and the durability reduces, produces hydraulic oil easily and reveal.
Disclosure of Invention
According to the defects of the prior art, the square cylinder capable of solving the sealing problem of the square cylinder, the sealing ring and the sealing structure used in the square cylinder are provided, the sealing problem of the square cylinder is solved through the special sealing ring and the sealing structure, the square cylinder can replace the traditional cylinder in a specific occasion, the load stress is not required to be converted through a cylinder piston end and a square steel plate, the friction loss is reduced, the object stress is uniform, and the rated output of the cylinder is increased.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the square cylinder comprises a cylinder body with a square cross section, a square cylinder cavity arranged in the cylinder body, a piston with a square cross section and a piston rod, wherein the piston is arranged in the square cylinder cavity and divides the square cylinder cavity into a lower cylinder cavity and an upper cylinder cavity, a pressurizing oil nozzle is arranged at the lower part of the lower cylinder cavity, and a pressure relief oil nozzle is arranged at the upper part of the upper cylinder cavity; a first sealing bag ring and a second sealing bag ring are arranged between the piston and the inner wall of the square cylinder cavity, a first annular sealing groove and a second annular sealing groove are respectively formed in the outer wall of the piston at positions corresponding to the first sealing bag ring and the second sealing bag ring, and the first sealing bag ring and the second sealing bag ring are respectively embedded into the first annular sealing groove and the second annular sealing groove; a third sealing bag ring is arranged between the outer wall of the piston rod and the opening of the cylinder body, a third annular sealing groove is correspondingly formed in the opening of the cylinder body, and the third sealing bag ring is embedded into the third annular sealing groove; the first sealing bag ring, the second sealing bag ring and the third sealing bag ring are all annular hollow bag body structures filled with liquid or gas, the outer wall of each sealing bag ring is tightly attached to the inner wall of the corresponding sealing groove and seals the notch of the corresponding sealing groove, the inner grooves of the first annular sealing groove, the second annular sealing groove and the third annular sealing groove are communicated with the square cylinder cavity, and hydraulic oil is injected into the inner groove surfaces of the three sealing grooves through the square cylinder cavity to respectively pressurize the three sealing bag rings so that the sealing bag rings are tightly attached to the inner wall of the cylinder body to form sealing.
The invention has the preferable technical scheme that: the sections of the oil cylinder, the square cylinder cavity, the piston and the piston rod are square with four corners being arc-shaped, and the radians of all arc angles are the same; the first sealing bag ring, the second sealing bag ring, the third sealing bag ring, the first annular sealing groove, the second annular sealing groove and the third annular sealing groove are square ring bodies with round corners, and the radius of the round corners is equal; the inner surfaces of the first sealing bag ring and the second sealing bag ring are respectively in close contact with the groove walls of the first annular sealing groove and the second annular sealing groove after being pressurized by hydraulic oil, and the outer surfaces of the first sealing bag ring and the second sealing bag ring are respectively in close contact with the inner wall of the square cylinder cavity; and the inner surface of the third sealing bag ring is tightly contacted with the outer wall of the piston rod after being pressurized by hydraulic oil, and the outer surface of the third sealing bag ring is tightly contacted with the groove wall of the third annular sealing groove.
The invention has the preferable technical scheme that: the upper surface and the lower surface of the first sealing bag ring and the second sealing bag ring are respectively provided with a first sealing check ring, the second sealing check ring is arranged above the third sealing bag ring, and the cylinder opening of the square cylinder body is provided with a dustproof ring; the first sealing retainer ring, the second sealing retainer ring and the dustproof ring are round corner square with the same shape as the annular sealing bag ring, retainer ring clamping grooves are formed in positions corresponding to the first sealing retainer ring, the second sealing retainer ring and the dustproof ring, the first sealing retainer ring, the second sealing retainer ring and the dustproof ring are embedded into the corresponding retainer ring clamping grooves, and the upper surface or the lower surface of the first sealing retainer ring or the second sealing retainer ring is tightly attached to the corresponding sealing bag ring; the part of the cylinder body cylinder opening above the third sealing bag ring is provided with a bump.
The invention has the preferable technical scheme that: the first annular sealing groove is arranged at the upper part of the piston and close to the upper oil cylinder cavity, and is communicated with the upper oil cylinder cavity through a first oil through hole; the second annular sealing groove is arranged at the lower part of the piston and close to the lower oil cylinder cavity and is communicated with the lower oil cylinder cavity through a second oil through hole, and the first oil through hole and the second oil through hole are both formed in the piston; the third annular sealing groove is arranged at the lower part of the opening of the cylinder body and is directly communicated with the cylinder body through a gap between the piston rod and the cylinder body; the first sealing bag ring and the second sealing bag ring are respectively filled with hydraulic oil through the first oil through hole and the second oil through hole to pressurize and then seal the piston and the cylinder body, and the third sealing bag ring is filled with hydraulic oil through a gap communicated with the third annular sealing groove and the upper cylinder cavity to pressurize and then seal the opening of the cylinder body.
The invention has the preferable technical scheme that: the first sealing bag ring, the second sealing bag ring and the third sealing bag ring are all of an annular bag-shaped structure formed by integrally adopting corrosion-resistant, high-elasticity and flexible rubber or synthetic resin, and the tensile strength of the three sealing bag rings is equal to or greater than 1.2 times of the rated oil pressure of the oil cylinder.
The invention has the preferable technical scheme that: the first sealing retainer rings are respectively arranged at the notches of the first annular sealing groove and the second annular sealing groove, retainer ring clamping grooves are respectively formed in the upper part and the lower part of the notches of the first annular sealing groove and the second annular sealing groove, one end of each first sealing retainer ring is correspondingly embedded into each retainer ring clamping groove, and the other end face is in contact with the inner wall of the cylinder body; the second sealing check ring is correspondingly arranged on the piston rod, and is in sealing contact with the third sealing bag ring when the piston rod moves to the cylinder opening position; the dustproof ring is arranged on the convex block, and the end face of the dustproof ring is contacted with the outer wall of the piston rod.
The invention provides a sealing ring for a square cylinder, which is characterized in that: the sealing ring is a square annular hollow bag body structure made of rubber materials or synthetic resin materials with the tensile strength equal to or larger than 1.2 times of the rated oil pressure of the oil cylinder, the outer ring and the inner ring corner of the bag ring are both arranged to be arc-shaped angles with equal radian, and gas or liquid in the sealing bag ring is directly filled in the sealing ring forming process or is filled in through an oil filling nozzle or an air filling opening on the sealing ring after the sealing ring is formed.
The invention provides a sealing structure for a square cylinder, which is characterized in that: the sealing structure comprises a piston upper sealing element, a piston lower sealing element and a cylinder port sealing element, wherein the piston upper sealing element is arranged at a position, close to an upper cylinder cavity, of the upper part of the piston; the upper sealing piece and the lower sealing piece of the piston are both composed of annular sealing bag rings and annular grooves correspondingly arranged on the periphery of the piston body, the cylinder port sealing piece is composed of annular sealing bag rings and annular grooves correspondingly arranged on the inner surface of the cylinder port, each sealing bag ring is of an annular hollow bag body structure with tensile strength equal to or greater than 1.2 times of rated oil pressure of the oil cylinder, an inner cavity made of rubber materials or synthetic resin materials is filled with gas or liquid, and each annular sealing bag ring is sealed and embedded into the annular groove; the inner groove surfaces of the annular grooves in the upper sealing piece and the cylinder opening sealing piece of the piston are communicated with the upper cylinder cavity through oil holes or oil communication channels, the inner groove surfaces of the annular grooves in the lower sealing piece of the piston are communicated with the lower cylinder cavity through the oil holes, and hydraulic oil is respectively injected into the three annular grooves through the upper cylinder cavity and the lower cylinder cavity after the sealing piece is installed to pressurize and seal the sealing bag ring.
The invention has the preferable technical scheme that: the annular sealing bag ring and the annular groove in the upper sealing piece of the piston, the lower sealing piece of the piston and the cylinder port sealing piece are square with four corners being arc-shaped, and the radian of all arc angles is the same.
The invention has the preferable technical scheme that: the upper sealing piece of the piston and the upper surface and the lower surface of the sealing bag ring of the lower sealing piece of the piston are respectively provided with a first sealing check ring, and a second sealing check ring and a dust-proof ring are arranged above the sealing bag ring of the cylinder port sealing piece; and the first sealing check ring, the second sealing check ring and the dustproof ring are round corner square with the same shape as the annular sealing bag ring, and check ring clamping grooves are formed in positions corresponding to the first sealing check ring, the second sealing check ring and the dustproof ring.
The sealing bag ring is a hollow sealing bag ring filled with gas or liquid, is of an integral structure adopting corrosion-resistant, high-elasticity and flexible rubber or synthetic resin, can be used for hollow sealing in a gas high-pressure bin, ensures the sealing effect, and can be hydraulic oil. The arrangement mode of the cylinder body, the cylinder cavity, the piston and the piston rod is consistent with that of the existing circular jack, the cylinder body, the cylinder cavity, the piston and the piston rod are all arranged into a square structure, the square cylinder cavity is divided into an upper cavity and a lower cavity by the piston, and the end part of the piston rod is provided with an expansion end with the same size as the section of the piston, so that the piston rod can be directly sealed with a cylinder opening of the cylinder through a piston rod sealing element. The sealing retainer ring is arranged in the same way as the sealing retainer ring of the existing circular piston, the shape of the sealing retainer ring is round-corner square, the sealing retainer ring and the dustproof ring are arranged on the side, close to the outlet, of the sealing retainer ring at the outlet of the cylinder body, the sealing retainer ring and the dustproof ring are arranged in the same way as the sealing retainer ring and the dustproof ring of the existing circular cylinder, and the sealing retainer ring and the dustproof ring are arranged in the round-corner square similar to the sealing retainer ring.
The invention carries out chamfering treatment on 4 inner angles of the square cylinder and 4 outer angles of the square piston, four planes of the inner side wall of the square cylinder and four planes of the outer wall of the square piston are tangent to 1/4 cylindrical surface, so that the inner side wall of the cylinder body and the side surface of the piston form smooth continuous surfaces, after the square piston is subjected to chamfering treatment, the contact pressure of each point of the sealing contact surface is equal by filling hydraulic oil or gas in the sealing bag ring, the equal contact pressure and consistent pressure increasing speed on the sealing surface when the cylinder works are ensured, and the contact pressure is generated under the action of the working hydraulic oil in the cylinder and is increased along with the increase of the cylinder pressure, thereby achieving the aim of sealing the cylinder. The sealing bag ring is embedded into the sealing groove, the inner wall of the sealing bag ring is tightly contacted with the inner groove surface of the sealing groove, the inner groove surface of the sealing groove is provided with the hydraulic oil through hole leading to the cylinder body, and in the working process of the oil cylinder, the hydraulic oil can be injected into the inner groove surface of the sealing groove through the through hole to give radial pressure to the sealing bag ring, so that the sealing bag ring is tightly contacted with the sealing groove and the inner side surfaces of the piston and the cylinder body, and the sealing effect of the sealing bag ring is improved.
The square cylinder and the sealing device have the advantages of reasonable structure, reliable sealing mode, the use method is the same as that of a common cylinder, the square cylinder can replace a cylinder in a specific occasion, the load stress is not required to be converted by adding a square steel plate at the end of a cylinder piston, and the problems that the contact pressure of a sealing element is uneven and easy to damage and the sealing of the square cylinder are solved.
Drawings
FIG. 1 is a schematic diagram of a square cylinder of the present invention;
FIG. 2 is a cross-sectional view of AA in FIG. 1;
FIG. 3 is a cross-sectional view of BB in FIG. 1;
FIG. 4 is a schematic view of the structure of the sealing bladder ring of the present invention;
FIG. 5 is an enlarged schematic view of portion C of FIG. 1;
FIG. 6 is an enlarged schematic view of portion D of FIG. 1;
FIG. 7 is an enlarged schematic view of portion E of FIG. 1;
fig. 8 is an enlarged schematic view of the cylinder port seal in the present invention.
In the figure: 1-cylinder, 1-lug, 2-square cylinder cavity, 2-1-lower cylinder cavity, 2-upper cylinder cavity, 3-piston, 4-piston rod, 5-dust ring, 6-first sealing bag ring, 6-1-first annular sealing groove, 6-2-first oil through hole, 7-second sealing bag ring, 7-1-second annular sealing groove, 7-2-second oil through hole, 8-third sealing bag ring, 8-1-third annular sealing groove, 9-pressurized oil nozzle, 10-relief oil nozzle, 11-retainer ring clamping groove, 12-first sealing retainer ring and 13-second sealing retainer ring.
Detailed Description
The invention will be further described with reference to examples and figures. The following detailed description of the embodiments of the invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 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 definition or explanation thereof is necessary in the following figures.
In the description of the embodiments below, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc., are based on those shown in the drawings, or those conventionally put in place when the product is used, or those conventionally understood by those skilled in the art, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The invention provides a sealing structure for a square oil cylinder, which is shown in fig. 2 to 8, and comprises a piston upper sealing element, a piston lower sealing element and a cylinder port sealing element, wherein the piston upper sealing element is arranged at a position, close to an upper oil cylinder cavity 2-2, of the upper part of the piston, the piston lower sealing element is arranged at a position, close to a lower oil cylinder cavity 2-1, of the lower part of the piston, and the cylinder port sealing element is arranged at a position, close to the upper oil cylinder cavity 2-2, of the lower part of the cylinder port; the upper sealing piece and the lower sealing piece of the piston are both composed of annular sealing bag rings and annular grooves correspondingly arranged on the periphery of the piston body, the cylinder port sealing piece is composed of annular sealing bag rings and annular grooves correspondingly arranged on the inner surface of the cylinder port, each sealing bag ring is of an annular hollow bag body structure with tensile strength equal to or greater than 1.2 times of rated oil pressure of the oil cylinder, an inner cavity made of rubber materials or synthetic resin materials is filled with gas or liquid, and each annular sealing bag ring is sealed and embedded into the annular groove; the inner groove surfaces of the annular grooves in the upper sealing piece and the cylinder opening sealing piece of the piston are communicated with the upper cylinder cavity 2-2 through oil holes or oil communication channels, the inner groove surfaces of the annular grooves in the lower sealing piece of the piston are communicated with the lower cylinder cavity 2-1 through the oil holes, and hydraulic oil is respectively injected into the three annular grooves through the upper cylinder cavity and the lower cylinder cavity after the sealing piece is installed to pressurize the sealing bag ring for sealing. The annular sealing bag ring and the annular groove in the upper sealing piece of the piston, the lower sealing piece of the piston and the cylinder port sealing piece are square with four corners being arc-shaped, and the radian of all arc angles is the same. The upper sealing piece of the piston and the lower sealing piece of the piston are respectively provided with a first sealing check ring 12 on the upper surface and the lower surface, and a second sealing check ring 13 and a dust ring 5 are arranged above the sealing check ring of the cylinder port sealing piece; and the first sealing check ring 12, the second sealing check ring 13 and the dust ring 5 are round corner squares with the same shape as the annular sealing bag ring, and check ring clamping grooves 11 are arranged at positions corresponding to the first sealing check ring 12, the second sealing check ring 13 and the dust ring 5.
The sealing bag rings used in the implementation adopt the sealing ring for the square oil cylinder, in particular to a square annular bag-shaped structure formed by integrally adopting corrosion-resistant, high-elasticity and flexible rubber or synthetic resin, the tensile strength of the three sealing bag rings is equal to or more than 1.2 times of the rated oil pressure of the oil cylinder, the corners of the outer ring and the inner ring of the sealing bag rings are all arranged to be arc-shaped angles with equal radian, gas or liquid in the sealing bag rings is directly filled in the sealing ring forming process or is filled through an oil filling nozzle or an air filling opening on the sealing ring after the sealing ring is formed, and the caliber of the oil filling nozzle or the air filling opening is 1/5-1/4 of the diameter of the cavity section of the sealing bag rings when the oil filling nozzle or the air filling opening is arranged. The sealing bag ring can be sealed in a gas high-pressure bin, and when liquid is injected into the sealing bag ring, the liquid can adopt corrosion-resistant hydraulic oil.
The square cylinder provided by the embodiment comprises a cylinder body 1 with a square cross section, a square cylinder cavity 2 arranged in the cylinder body 1, a piston 3 with a square cross section and a piston rod 4, wherein the piston 3 is arranged in the square cylinder cavity 2 and divides the square cylinder cavity 2 into a lower cylinder cavity 2-1 and an upper cylinder cavity 2-2, a pressurizing oil nozzle 9 is arranged at the lower part of the lower cylinder cavity 2-1, and a pressure relief oil nozzle 10 is arranged at the upper part of the upper cylinder cavity 2-2; the invention carries out rounding treatment on 4 inner angles of the square cylinder and 4 outer angles of the square piston, four planes of the inner side wall of the square cylinder and four planes of the outer wall of the square piston are tangent to 1/4 cylindrical surfaces, so that the sections of the cylinder 1, the square cylinder cavity 2, the piston 3 and the piston rod 4 are square with four corners forming circular arcs, the radian of all circular arc angles is the same, the inner side wall of the cylinder body and the side surface of the piston form smooth continuous surfaces, and after the square piston is subjected to rounding treatment, the hydraulic oil or gas is filled in the sealing bag ring to ensure that the contact pressure of each point of a sealing contact surface is equal, thereby ensuring that the contact pressure on the sealing surface is equal and the pressure increasing speed is consistent when the cylinder works.
As shown in fig. 1 to 3, a first sealing bag ring 6 and a second sealing bag ring 7 are arranged between a piston 3 and the inner wall of a square cylinder cavity 2, a first annular sealing groove 6-1 and a second annular sealing groove 7-1 are respectively formed in the outer wall of the piston 3 at positions corresponding to the first sealing bag ring 6 and the second sealing bag ring 7, and the first sealing bag ring 6 and the second sealing bag ring 7 are respectively embedded into the first annular sealing groove 6-1 and the second annular sealing groove 7-1; a third sealing bag ring 8 is arranged between the outer wall of the piston rod 4 and the opening of the cylinder body 1, a third annular sealing groove 8-1 is correspondingly formed in the opening of the cylinder body 1, and the third sealing bag ring 8 is embedded into the third annular sealing groove 8-1; the shapes of the first sealing bag ring 6, the third sealing bag ring 8 of the second sealing bag ring 7, the first annular sealing groove 6-1, the second annular sealing groove 7-1 and the third annular sealing groove 8-1 are square ring bodies with round corners, and the round corners have equal radius.
In the square cylinder in implementation, as shown in fig. 1, a first sealing bag ring 6 is arranged at the upper part of a piston 3 and close to an upper cylinder cavity 2-2, a second sealing bag ring 7 is arranged at the lower part of the piston 3 and close to a lower cylinder cavity 2-1, and a third sealing bag ring 8 is arranged at the lower part of an opening of a cylinder body 1. As shown in fig. 5, the first annular sealing groove 6-1 is correspondingly arranged at the upper part of the piston 3 near the upper cylinder cavity 2-2, and is communicated with the upper cylinder cavity 2-2 through the first oil through hole 6-2, the first sealing bag ring 6 is embedded into the first annular sealing groove 6-1, the outer wall of the first sealing bag ring is tightly attached to the inner wall of the first annular sealing groove 6-1, the notch of the first annular sealing groove 6-1 is sealed, and the upper surface and the lower surface of the first sealing bag ring 6 are both provided with first sealing check rings 12. As shown in fig. 6, the second annular sealing groove 7-1 is correspondingly formed at a position near the lower cylinder cavity 2-1 at the lower part of the piston 3 and is communicated with the lower cylinder cavity 2-1 through the second oil through hole 7-2, the second sealing bag ring 7 is embedded into the second annular sealing groove 7-1, the outer wall of the second sealing bag ring is tightly attached to the inner wall of the second annular sealing groove 7-1, the notch of the second annular sealing groove 7-1 is sealed, and the upper surface and the lower surface of the second sealing bag ring 7 are both provided with first sealing check rings 12. The first oil through holes 6-2 and the second oil through holes 7-2 are all formed in the piston 3, the first sealing check rings 12 are respectively arranged at the notch positions of the first annular sealing groove 6-1 and the second annular sealing groove 7-1, check ring clamping grooves 11 are respectively formed in the upper and lower parts of the notch positions of the first annular sealing groove 6-1 and the second annular sealing groove 7-1, one end of each first sealing check ring 12 is correspondingly embedded into each check ring clamping groove 11, and the other end face is in contact with the inner wall of the cylinder body 1. As shown in fig. 7 and 8, the third annular sealing groove 8-1 is correspondingly formed at the lower part of the opening of the cylinder body 1, and is directly communicated with the cylinder body 1 through a gap between the piston rod 4 and the cylinder body 1, and a second sealing check ring 13 is arranged above the third sealing bag ring 8, and the second sealing check ring 13 is correspondingly arranged on the piston rod 4, and when the piston rod moves to the cylinder opening position, the second sealing check ring 13 is in sealing contact with the third sealing bag ring 8. The inner surfaces of the first sealing bag ring 6 and the second sealing bag ring 7 are respectively in close contact with the groove walls of the first annular sealing groove 6-1 and the second annular sealing groove 7-1 after being pressurized by hydraulic oil, and the outer surfaces of the first sealing bag ring and the second sealing bag ring are respectively in close contact with the inner wall of the square cylinder cavity 2; the inner surface of the third sealing bag ring 8 is tightly contacted with the outer wall of the piston rod 4 after being pressurized by hydraulic oil, and the outer surface is tightly contacted with the groove wall of the third annular sealing groove 8-1. When the oil cylinder works, hydraulic oil is injected into the inner groove surfaces of the three sealing grooves through the square cylinder cavity 2 to respectively pressurize the three sealing bag rings to be closely attached to the inner wall of the cylinder body 1 so as to form sealing.
In the square cylinder in implementation, as shown in fig. 8, a bump 1-1 is arranged at a position of the cylinder opening of the cylinder body 1 above the third sealing bag ring 8, a dust-proof ring 5 is arranged on the bump 1-1, the dust-proof ring 5 is embedded into a groove arranged on the butt joint surface of the bump 1-1 and the piston rod 4, and the end surface of the dust-proof ring is contacted with the outer wall of the piston rod 4.
The working process of the invention is the same as that of the existing hydraulic cylinder, and in the concrete working process, hydraulic oil is injected into the lower cylinder cavity 2-1 through the pressurizing oil nozzle 9 to give pressure to the piston, meanwhile, hydraulic oil is injected into the inner groove surfaces of the first annular sealing groove 6-1 and the second annular sealing groove 7-1 through the first oil through hole 6-2 and the second oil through hole 7-2 on the piston to give radial pressure to the first sealing bag ring 6 and the second sealing bag ring 7, so that the outer walls of the first sealing bag ring 6 and the second sealing bag ring 7 are in closer contact with the corresponding sealing groove, the piston and the cylinder body, and the sealing effect between the upper part and the lower part of the piston and the cylinder body is ensured; meanwhile, hydraulic oil is injected into the inner groove surface of the third annular sealing groove 8-1 through a gap between the piston rod 4 and the cylinder body, and radial pressure is given to the third sealing bag ring 8, so that the third sealing bag ring is sealed with the cylinder opening of the cylinder body 1.
The foregoing description of only one embodiment of the invention is specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (8)
1. The utility model provides a square cylinder which characterized in that: the square cylinder comprises a cylinder body (1) with a square cross section, a square cylinder cavity (2) arranged in the cylinder body (1), a piston (3) with a square cross section and a piston rod (4), wherein the piston (3) is arranged in the square cylinder cavity (2) and divides the square cylinder cavity (2) into a lower cylinder cavity (2-1) and an upper cylinder cavity (2-2), a pressurizing oil nozzle (9) is arranged at the lower part of the lower cylinder cavity (2-1), and a relief oil nozzle (10) is arranged at the upper part of the upper cylinder cavity (2-2); a first sealing bag ring (6) and a second sealing bag ring (7) are arranged between the piston (3) and the inner wall of the square cylinder cavity (2), a first annular sealing groove (6-1) and a second annular sealing groove (7-1) are respectively formed in positions, corresponding to the first sealing bag ring (6) and the second sealing bag ring (7), of the outer wall of the piston (3), and the first sealing bag ring (6) and the second sealing bag ring (7) are respectively embedded into the first annular sealing groove (6-1) and the second annular sealing groove (7-1); the first annular sealing groove (6-1) is arranged at the upper part of the piston (3) near the upper oil cylinder cavity (2-2) and is communicated with the upper oil cylinder cavity (2-2) through the first oil through hole (6-2); the second annular sealing groove (7-1) is arranged at the lower part of the piston (3) and close to the lower oil cylinder cavity (2-1), and is communicated with the lower oil cylinder cavity (2-1) through a second oil through hole (7-2), and the first oil through hole (6-2) and the second oil through hole (7-2) are both arranged on the piston (3); the third annular sealing groove (8-1) is arranged at the lower part of the opening of the cylinder body (1) and is directly communicated with the gap between the cylinder body (1) through the piston rod (4); the first sealing bag ring (6) and the second sealing bag ring (7) are respectively filled with hydraulic oil through a first oil through hole (6-2) and a second oil through hole (7-2) for pressurizing and then seal the piston (3) and the cylinder body (1), and the third sealing bag ring (8) is filled with hydraulic oil through a gap communicated with a third annular sealing groove (8-1) and the upper cylinder cavity (2-2) for pressurizing and then seals the opening of the cylinder body (1); a third sealing bag ring (8) is arranged between the outer wall of the piston rod (4) and the opening of the cylinder body (1), a third annular sealing groove (8-1) is correspondingly formed in the opening of the cylinder body (1), and the third sealing bag ring (8) is embedded into the third annular sealing groove (8-1);
the first sealing bag ring (6), the second sealing bag ring (7) and the third sealing bag ring (8) are all annular hollow bag body structures filled with liquid or gas, the outer wall of each sealing bag ring (8) is clung to the inner wall of the corresponding sealing groove and seals the corresponding sealing groove opening, the inner grooves of the first annular sealing groove (6-1), the second annular sealing groove (7-1) and the third annular sealing groove (8-1) are communicated with the square cylinder cavity (2), and hydraulic oil is injected into the inner groove surfaces of the three sealing grooves through the square cylinder cavity (2) to respectively pressurize the three sealing bag rings to be clung to the inner wall of the cylinder body (1) so as to form sealing; the upper surface and the lower surface of the first sealing bag ring (6) and the second sealing bag ring (7) are respectively provided with a first sealing check ring (12), the upper part of the third sealing bag ring (8) is provided with a second sealing check ring (13), and the cylinder opening of the square cylinder cavity (2) is provided with a dustproof ring (5);
the first sealing retainer ring (12), the second sealing retainer ring (13) and the dust ring (5) are round corners square with the shape identical to that of the annular sealing bag ring, retainer ring clamping grooves (11) are formed in positions corresponding to the first sealing retainer ring (12), the second sealing retainer ring (13) and the dust ring (5), the first sealing retainer ring (12), the second sealing retainer ring (13) and the dust ring (5) are embedded into the corresponding retainer ring clamping grooves (11), and the upper surface or the lower surface of the first sealing retainer ring is tightly attached to the corresponding sealing bag ring; the part of the cylinder body (1) with the cylinder opening above the third sealing bag ring (8) is provided with a bump (1-1).
2. A square cylinder as defined in claim 1, wherein: the sections of the cylinder body (1), the square cylinder cavity (2), the piston (3) and the piston rod (4) are square with four corners being arc-shaped, and the radian of all arc angles is the same; the first sealing bag ring (6), the second sealing bag ring (7), the third sealing bag ring (8), the first annular sealing groove (6-1), the second annular sealing groove (7-1) and the third annular sealing groove (8-1) are square ring bodies with round corners, and the round corners have equal radius; the inner surfaces of the first sealing bag ring (6) and the second sealing bag ring (7) are respectively in close contact with the groove walls of the first annular sealing groove (6-1) and the second annular sealing groove (7-1) after being pressurized by hydraulic oil, and the outer surfaces of the first sealing bag ring and the second sealing bag ring are respectively in close contact with the inner wall of the square cylinder cavity (2); after being pressurized by hydraulic oil, the inner surface of the third sealing bag ring (8) is tightly contacted with the outer wall of the piston rod (4), and the outer surface of the third sealing bag ring is tightly contacted with the groove wall of the third annular sealing groove (8-1).
3. A square cylinder as claimed in claim 1 or 2, wherein: the first sealing bag ring (6), the second sealing bag ring (7) and the third sealing bag ring (8) are all of annular bag-shaped structures formed by rubber or synthetic resin with corrosion resistance, high elasticity and flexibility, and the tensile strength of the three sealing bag rings is equal to or greater than 1.2 times of rated oil pressure of the oil cylinder.
4. A square cylinder as claimed in claim 1 or 2, wherein: : the first sealing retainer ring (12) is respectively arranged at the notches of the first annular sealing groove (6-1) and the second annular sealing groove (7-1), retainer ring clamping grooves (11) are respectively formed in the upper part and the lower part of the notches of the first annular sealing groove (6-1) and the second annular sealing groove (7-1), one end of the first sealing retainer ring (12) is correspondingly embedded into the retainer ring clamping grooves (11), and the other end face is in contact with the inner wall of the cylinder body (1); the second sealing check ring (13) is correspondingly arranged on the piston rod (4), and when the piston rod moves to the cylinder opening position, the second sealing check ring (13) is in sealing contact with the third sealing bag ring (8); the dustproof ring (5) is arranged on the convex block (1-1), and the end surface of the dustproof ring is contacted with the outer wall of the piston rod (4).
5. A gasket for use in a square cylinder as claimed in claim 1 or 2, characterized in that: the sealing bag ring is of a square annular hollow bag body structure made of rubber materials or synthetic resin materials, wherein the tensile strength of the rubber materials or the synthetic resin materials is equal to or greater than 1.2 times of the rated oil pressure of the oil cylinder, the corners of the outer ring and the inner ring of the bag ring are respectively provided with arc angles with equal radian, and gas or liquid in the sealing bag ring is directly filled in the forming process of the sealing ring or is filled in the sealing ring through an oil filling nozzle or an air filling opening of the sealing ring after the sealing ring is formed.
6. A sealing structure for use in the square cylinder as claimed in claim 1 or 2, characterized in that: the sealing structure comprises a piston upper sealing element, a piston lower sealing element and a cylinder port sealing element, wherein the piston upper sealing element is arranged at the position, close to an upper cylinder cavity (2-2), of the upper part of the piston, the piston lower sealing element is arranged at the position, close to a lower cylinder cavity (2-1), of the lower part of the piston, and the cylinder port sealing element is arranged at the position, close to the upper cylinder cavity (2-2), of the lower part of the cylinder port; the upper sealing piece and the lower sealing piece of the piston are both composed of annular sealing bag rings and annular grooves correspondingly arranged on the periphery of the piston body, the cylinder port sealing piece is composed of annular sealing bag rings and annular grooves correspondingly arranged on the inner surface of the cylinder port, each sealing bag ring is of an annular hollow bag body structure with tensile strength equal to or greater than 1.2 times of rated oil pressure of the oil cylinder, an inner cavity made of rubber materials or synthetic resin materials is filled with gas or liquid, and each annular sealing bag ring is sealed and embedded into the annular groove; the inner groove surfaces of the annular grooves in the upper sealing piece and the cylinder opening sealing piece of the piston are communicated with the upper cylinder cavity (2-2) through oil holes or oil communication channels, the inner groove surfaces of the annular grooves in the lower sealing piece of the piston are communicated with the lower cylinder cavity (2-1) through the oil holes, and hydraulic oil is injected into the three annular grooves through the upper cylinder cavity and the lower cylinder cavity respectively after the sealing piece is installed to pressurize the sealing bag ring for sealing.
7. The sealing structure for use in a square cylinder according to claim 6, wherein: the annular sealing bag ring and the annular groove in the upper sealing piece of the piston, the lower sealing piece of the piston and the cylinder port sealing piece are square with four corners being arc-shaped, and the radian of all arc angles is the same.
8. The sealing structure for use in a square cylinder according to claim 6, wherein: the upper sealing piece of the piston and the upper surface and the lower surface of the sealing bag ring of the lower sealing piece of the piston are respectively provided with a first sealing check ring (12), and a second sealing check ring (13) and a dust ring (5) are arranged above the sealing bag ring of the cylinder port sealing piece; and the first sealing check ring (12), the second sealing check ring (13) and the dust ring (5) are round corners square with the shape identical to that of the annular sealing bag ring, and check ring clamping grooves (11) are formed in positions corresponding to the first sealing check ring (12), the second sealing check ring (13) and the dust ring (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449817.XA CN110118211B (en) | 2019-05-28 | 2019-05-28 | Square cylinder and sealing ring and sealing structure used in square cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449817.XA CN110118211B (en) | 2019-05-28 | 2019-05-28 | Square cylinder and sealing ring and sealing structure used in square cylinder |
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| CN110118211A CN110118211A (en) | 2019-08-13 |
| CN110118211B true CN110118211B (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910449817.XA Active CN110118211B (en) | 2019-05-28 | 2019-05-28 | Square cylinder and sealing ring and sealing structure used in square cylinder |
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| CN109534211A (en) * | 2019-01-24 | 2019-03-29 | 长江水利委员会长江科学院 | A kind of flexible jack |
| CN210034022U (en) * | 2019-05-28 | 2020-02-07 | 长江水利委员会长江科学院 | Square oil cylinder, sealing ring used in square oil cylinder and sealing structure |
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| AT408209B (en) * | 2000-03-23 | 2001-09-25 | Hoerbiger Hydraulik | Activation arrangement for moveable parts on vehicles |
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| GB1269055A (en) * | 1968-06-28 | 1972-03-29 | Rootes Motors Ltd | Improvements in or relating to hydraulic dampers |
| CN102162479A (en) * | 2011-05-06 | 2011-08-24 | 浙江浦大液压机械有限公司 | Composite boosting oil cylinder |
| CN102797723A (en) * | 2012-07-26 | 2012-11-28 | 苏州劲元液压机电设备有限公司 | Thin-type hydraulic oil cylinder |
| CN109281891A (en) * | 2018-11-09 | 2019-01-29 | 湖南师范大学 | A kind of sealing piston of hydraulic cylinder device and hydraulic cylinder that seal clearance is variable |
| CN109534211A (en) * | 2019-01-24 | 2019-03-29 | 长江水利委员会长江科学院 | A kind of flexible jack |
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