CN203823043U - Sealing structure for oil cylinder - Google Patents

Sealing structure for oil cylinder Download PDF

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Publication number
CN203823043U
CN203823043U CN201420222640.2U CN201420222640U CN203823043U CN 203823043 U CN203823043 U CN 203823043U CN 201420222640 U CN201420222640 U CN 201420222640U CN 203823043 U CN203823043 U CN 203823043U
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CN
China
Prior art keywords
piston
sealing structure
oil
chamber
oil inlet
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420222640.2U
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Chinese (zh)
Inventor
罗静
Original Assignee
罗静
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 罗静 filed Critical 罗静
Priority to CN201420222640.2U priority Critical patent/CN203823043U/en
Application granted granted Critical
Publication of CN203823043U publication Critical patent/CN203823043U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a sealing structure and particularly relates to a sealing structure for an oil cylinder. The sealing structure for the oil cylinder comprises a cylinder body and a piston, wherein the piston is located in an inner cavity of the cylinder body, the inner cavity of the cylinder body is divided into a front semi-cavity and a rear semi-cavity by the piston, two annular grooves are formed in the outer side wall of the piston in parallel, a certain distance exists between the two annular grooves, a sealing ring is arranged in each annular groove, the cross section of each sealing ring is in an H shape, a sealed oil storage chamber is formed between the lower half portion of each sealing ring and the bottom surface of the corresponding annular groove, and two oil inlet channels which are independent of each other are arranged on the piston; one port of one oil inlet channel is communicated with the sealed oil storage chamber close to the front semi-cavity, and the other port of the oil inlet channel is communicated with the front semi-cavity; one port of the other oil inlet channel is communicated with the sealed oil storage cavity close to the rear semi-cavity, and the other port of the oil inlet channel is communicated with the rear semi-cavity. According to the sealing structure for the oil cylinder, high stability of sealing between the cylinder body and the piston is achieved, and the sealing structure for the oil cylinder has the advantage that the working efficiency is high.

Description

A kind of oil cylinder sealing structure
Technical field
The utility model relates to a kind of sealing configuration, particularly a kind of oil cylinder sealing structure.
Background technique
Current oil hydraulic cylinder, its structure generally includes: cylinder body and be arranged on the piston in inner chamber of cylinder block, this piston is divided into first half chamber and later half chamber by inner chamber of cylinder block, cylinder body is comprised of the end cover of cylinder barrel and cylinder barrel front end, by alternately realizing piston and move back and forth in cylinder body toward being pressed into hydraulic fluid in forward and backward half chamber in above-mentioned.
Between first half chamber and later half chamber, by the piston packing being embedded in the seal groove of the outer border of piston, seal, thus realize forward and backward half chamber each other seal to promote the hydraulic thrust of hydraulic fluid to piston completely.Conventional piston packing has O-ring seals or lip-type packing etc. at present.Piston packing in the working pressure of oil cylinder chamber reaches 25MPa when above, be above-mentioned just easily leaks.Therefore be necessary above-mentioned hydraulic cylinder structure to improve.
Model utility content
The purpose of this utility model is in order to solve the deficiency of above-mentioned technology, to provide a kind of can provide oil cylinder and the piston oil cylinder sealing structure of fitted seal between the two.
In order to achieve the above object, a kind of oil cylinder sealing structure that the utility model is designed, comprise cylinder body and be arranged in inner chamber of cylinder block and inner chamber of cylinder block be separated into the piston in first half chamber and later half chamber, on the outer side wall of described piston, be arranged with two annular grooves in parallel, and these two annular grooves keep a determining deviation each other, in two above-mentioned annular grooves, all plug is connected to the seal ring that cross section is " H " shape, and all form a tight storage chamber between lower half portion of each seal ring and the bottom surface of corresponding annular groove, described piston is provided with two separate oil inlet passages, wherein a port of an above-mentioned oil inlet passage is connected with the tight storage chamber that closes on first half chamber, another port is connected with first half chamber, one port of another oil inlet passage is connected with the tight storage chamber that closes on later half chamber, another port is connected with later half chamber.
Above-mentioned middle provided a kind of oil cylinder sealing structure, it is along with pressurized oil system is moved, fluid pressure medium rises, there is part fluid medium to flow into cross section for " H is " in the tight storage chamber of shape seal ring by the oil inlet passage on piston, along with constantly pouring in of fluid medium, above-mentioned tight storage chamber produces radial expansion under the active force of fluid medium, thereby making cross section is that " " the stage casing part of shape seal ring produces plastic deformation and fully contacts with oil cylinder madial wall H, oil cylinder working pressure is larger, the plastic deformation amount of above-mentioned middle seal ring is also just larger, lift-off seal circle and oil cylinder madial wall sealing stability between the two.As can be seen here, when the working pressure of oil cylinder chamber constantly promotes, what in this kind of oil cylinder sealing structure provided by the utility model, oil cylinder and the sealing stability between piston only can be relative promotes, and the problems such as sealing place leakage can not occur.
As further technological selection, the axial cross section of the oil inlet passage integral body in above-mentioned is curved.The oil inlet passage of this arc section is under the circulating resistance of fluid, working stability that can lift cylinder integral body.
As further technological improvement, parallelly on the piston madial wall in above-mentioned be embedded with two bar static sealing rings, these two bar static sealing rings keep a determining deviation each other equally.A pair of bar static sealing ring in this improvement technological scheme can avoid occurring the phenomenon of fluid from permeating between piston and piston rod, working stability that equally can lift cylinder integral body.
A kind of oil cylinder sealing structure provided by the utility model, it is the sealing good stability between cylinder body and piston in concrete use, and working efficiency is high.
Accompanying drawing explanation
Fig. 1 is a kind of view of embodiment 1 a kind of oil cylinder sealing structure that provides;
Fig. 2 is the another kind of view of embodiment 1 a kind of oil cylinder sealing structure that provides;
Fig. 3 is a kind of view of embodiment 2 a kind of oil cylinder sealing structure that provides;
Fig. 4 is a kind of view of embodiment 3 a kind of oil cylinder sealing structure that provides.
Wherein: cylinder body 1, first half chamber 1-1, later half chamber 1-2, piston 2, seal ring 3, lower half portion 3-1, tight storage chamber 3-2, stage casing part 3-3, oil inlet passage 4, piston rod 5, bar static sealing ring 6.
Embodiment
Below by embodiment, the utility model will be further described by reference to the accompanying drawings.
Embodiment 1:
As shown in Figure 1, a kind of oil cylinder sealing structure in the present embodiment, comprise cylinder body 1 and be arranged in cylinder body 1 inner chamber and cylinder body 1 inner chamber be separated into the piston 2 of first half chamber 1-1 and later half chamber 1-2, on the outer side wall of described piston 2, be arranged with two annular grooves in parallel, and these two annular grooves keep a determining deviation each other, in two above-mentioned annular grooves, all plug is connected to the seal ring 3 that cross section is " H " shape, and all form a tight storage chamber 3-2 between lower half portion 3-1 of each seal ring 3 and the bottom surface of corresponding annular groove, described piston 2 is provided with two separate oil inlet passages 4, wherein a port of an above-mentioned oil inlet passage 4 is connected with the tight storage chamber 3-2 that closes on first half chamber 1-1, another port is connected with first half chamber 1-1, one port of another oil inlet passage 4 is connected with the tight storage chamber 3-2 that closes on later half chamber 1-2, another port is connected with later half chamber 1-2.
Above-mentioned middle provided a kind of oil cylinder sealing structure, it is along with pressurized oil system is moved, fluid pressure medium rises, there is part fluid medium to flow into cross section for " H is " in the tight storage chamber 3-2 of shape seal ring 3 by the oil inlet passage 4 on piston 2, as shown in Figure 2, along with constantly pouring in of fluid medium, above-mentioned tight storage chamber 3-2 produces radial expansion under the active force of fluid medium, thereby making cross section is that " " the stage casing part 3-3 of shape seal ring 3 produces plastic deformation and fully contacts with oil cylinder madial wall H, oil cylinder working pressure is larger, the plastic deformation amount of above-mentioned middle seal ring 3 is also just larger, lift-off seal circle 3 and oil cylinder madial wall sealing stability between the two.As can be seen here, when the working pressure of oil cylinder chamber constantly promotes, what in this kind of oil cylinder sealing structure provided by the utility model, oil cylinder and the sealing stability between piston 2 only can be relative promotes, and the problems such as sealing place leakage can not occur.
Embodiment 2:
A kind of oil cylinder sealing structure providing in the present embodiment, embodiment 1 is consistent in its general structure territory, and as shown in Figure 3, but the axial cross section of 4 integral body of the oil inlet passage in the present embodiment is curved.Under the circulating resistance of 4 pairs of fluid of oil inlet passage of this arc section, working stability that can lift cylinder integral body.
Embodiment 3:
A kind of oil cylinder sealing structure providing in the present embodiment, embodiment 2 is consistent in its general structure territory, as shown in Figure 4, but parallelly on 2 madial walls of the piston in the present embodiment be embedded with two bar static sealing rings 6, these two bar static sealing rings 6 keep a determining deviation each other equally.A pair of bar static sealing ring 6 in this improvement technological scheme can avoid occurring that fluid is from the phenomenon of infiltration between piston 2 and piston rod 5, working stability that equally can lift cylinder integral body.

Claims (3)

1. an oil cylinder sealing structure, comprise cylinder body (1) and be arranged in this cylinder body (1) inner chamber and cylinder body (1) inner chamber be separated into the piston (2) of first half chamber (1-1) and later half chamber (1-2), on the outer side wall of described piston (2), be arranged with two annular grooves in parallel, and these two annular grooves keep a determining deviation each other, it is characterized in that all filling in and being connected to the seal ring (3) that cross section is " H " shape in two above-mentioned annular grooves, and all form a tight storage chamber (3-2) between lower half portion (3-1) of each seal ring (3) and the bottom surface of corresponding annular groove, described piston (2) is provided with two separate oil inlet passages (4), wherein a port of an above-mentioned oil inlet passage (4) is connected with the tight storage chamber (3-2) that closes on first half chamber (1-1), another port is connected with first half chamber (1-1), one port of another oil inlet passage (4) is connected with the tight storage chamber (3-2) that closes on later half chamber (1-2), another port is connected with later half chamber (1-2).
2. a kind of oil cylinder sealing structure according to claim 1, is characterized in that the whole axial cross section of oil inlet passage (4) in above-mentioned is curved.
3. a kind of oil cylinder sealing structure according to claim 1 and 2, it is characterized in that parallel two the bar static sealing rings (6) that are embedded with on piston (2) madial wall in above-mentioned, these two bar static sealing rings (6) keep a determining deviation each other equally.
CN201420222640.2U 2014-04-30 2014-04-30 Sealing structure for oil cylinder Expired - Fee Related CN203823043U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420222640.2U CN203823043U (en) 2014-04-30 2014-04-30 Sealing structure for oil cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420222640.2U CN203823043U (en) 2014-04-30 2014-04-30 Sealing structure for oil cylinder

Publications (1)

Publication Number Publication Date
CN203823043U true CN203823043U (en) 2014-09-10

Family

ID=51478548

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420222640.2U Expired - Fee Related CN203823043U (en) 2014-04-30 2014-04-30 Sealing structure for oil cylinder

Country Status (1)

Country Link
CN (1) CN203823043U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107939771A (en) * 2017-11-20 2018-04-20 武汉科技大学 A kind of linear oil cylinder with self-sealing function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107939771A (en) * 2017-11-20 2018-04-20 武汉科技大学 A kind of linear oil cylinder with self-sealing function

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140910

Termination date: 20150430

EXPY Termination of patent right or utility model