阅读说明：本技术 双作用孔用u型低阻尼密封圈 (U-shaped low-damping sealing ring for dual-purpose hole ) 是由 李瑞川 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种双作用孔用U型低阻尼密封圈,包括密封圈本体,密封圈本体上设置有凹槽,凹槽的两侧分别设置有一个环状的槽肩,槽肩上设置有自其外侧边沿向其内侧边沿倾斜延伸的斜面,槽肩内侧边沿的外径大于孔的内径；槽肩外侧边沿的外径小于或等于孔的内径；使用时,液压油从槽肩外侧边沿与孔配合面之间的小缝隙施加压力,使得槽肩的外周面发生变形并与孔配合面之间形成小缝隙通道,液压油进入到凹槽内,液压油通过凹槽的内弧面对密封圈本体施加压力,使其产生变形且其两个侧面和外周面压紧在密封圈安装槽的内壁上,另一侧的槽肩处由于内侧压力大于外侧压力,其内侧边沿被压紧在孔的内壁上,所以液压油无法从该侧流出,实现密封。(The invention discloses a U-shaped low-damping sealing ring for a double-acting hole, which comprises a sealing ring body, wherein a groove is formed in the sealing ring body, two annular groove shoulders are respectively arranged on two sides of the groove, an inclined plane which obliquely extends from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder is arranged on the groove shoulder, and the outer diameter of the inner side edge of the groove shoulder is larger than the inner diameter of the hole; the outer diameter of the outer side edge of the groove shoulder is smaller than or equal to the inner diameter of the hole; when the sealing ring is used, hydraulic oil applies pressure from a small gap between the outer side edge of the groove shoulder and the hole matching surface, so that the outer peripheral surface of the groove shoulder deforms and forms a small gap channel with the hole matching surface, the hydraulic oil enters the groove, the hydraulic oil applies pressure to the sealing ring body through the inner arc surface of the groove, the sealing ring body deforms, the two side surfaces and the outer peripheral surface of the sealing ring body are pressed on the inner wall of the sealing ring mounting groove, the groove shoulder at the other side cannot flow out from the side because the inner side pressure is greater than the outer side pressure, and the inner side edge of the groove shoulder is pressed on the inner wall of the hole, so that sealing is realized.)

1. U type low damping sealing washer is used in dual action hole, its characterized in that: the sealing ring comprises an annular sealing ring body arranged in a sealed hole, wherein an annular groove is formed in the outer peripheral surface of the sealing ring body, annular groove shoulders are respectively arranged on two sides of the groove, an inclined surface which obliquely extends from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder is arranged on the groove shoulder, and the outer diameter of the inner side edge of the groove shoulder is larger than the inner diameter of the hole; the outer diameter of the outer side edge of the groove shoulder is smaller than or equal to the inner diameter of the hole.

2. A U-shaped low damping seal ring for a dual acting bore as defined in claim 1, wherein: the inner surface of the groove is an arc-shaped surface.

3. A U-shaped low damping seal ring for a dual acting bore as defined in claim 1, wherein: the inner surface of the groove is an arc-like surface consisting of a plurality of continuous folding surfaces.

4. A U-shaped low damping seal ring for a dual acting bore as defined in claim 1, wherein: and in an uninstalled state, an included angle of 5-20 degrees is formed between the annular outer surface of the groove shoulder and the inner surface of the hole.

5. A U-shaped low damping seal ring for a dual acting bore as defined in claim 1, wherein: under the installation state, the annular outer surface of groove shoulder with the internal surface in hole is pressed together, and the contact surface outer edge that presses of both has narrow gap, narrow gap's length is press 5% ~ 20% of contact surface length.

6. A U-shaped low damping seal ring for a dual acting bore as defined in claim 1, wherein: the groove is formed in the center of the outer peripheral surface of the sealing ring body.

7. The U-shaped low-damping seal ring for a dual acting bore according to any one of claims 1 to 6, wherein: and an annular check ring for eliminating a gap is arranged in the mounting groove at one side or two sides of the sealing ring body.

Technical Field

The invention relates to a sealing ring, in particular to a U-shaped low-damping sealing ring for a double-acting hole.

Background

The hydraulic sealing ring is widely applied to occasions such as pipelines and pressure containers, the contact area of a sealing joint surface of the traditional sealing ring is large, large resistance is generated during high-speed movement, distortion and overturning are easy to occur, leakage is easy to cause, large friction force can cause large abrasion during the working of the sealing ring, and the service life is shortened. The seal ring with a small contact area has a poor sealing effect although its frictional resistance is small.

Disclosure of Invention

The invention aims to solve the technical problem of providing the U-shaped low-damping sealing ring for the double-acting hole, which has the advantages of good sealing effect, small damping area, small damping force, micro-deformation compensation function and no distortion and overturn in the high-speed movement process.

In order to solve the technical problems, the technical scheme of the invention is as follows: the U-shaped low-damping sealing ring for the double-acting hole comprises an annular sealing ring body arranged in a sealed hole, wherein an annular groove is formed in the outer peripheral surface of the sealing ring body, annular groove shoulders are respectively arranged on two sides of the groove, an inclined plane which obliquely extends from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder is arranged on the groove shoulder, and the outer diameter of the inner side edge of the groove shoulder is larger than the inner diameter of the hole; the outer diameter of the outer side edge of the groove shoulder is smaller than or equal to the inner diameter of the hole.

As a preferable technical solution, the inner surface of the groove is a circular arc surface.

As a preferable technical solution, the inner surface of the groove is an arc-like surface composed of a plurality of continuous folding surfaces.

As a preferable technical solution, in an uninstalled state, an included angle of 5 ° to 20 ° is formed between the annular outer surface of the groove shoulder and the inner surface of the hole.

Under the installation state, the annular outer surface of groove shoulder with the internal surface in hole is pressed together, and the contact surface outer edge that presses of both has narrow gap, narrow gap's length is press 5% ~ 20% of contact surface length.

As a preferable technical solution, the groove is provided in the center of the outer peripheral surface of the seal ring body.

As a preferable technical scheme, an annular retainer ring for eliminating a gap is arranged in the mounting groove at one side or two sides of the sealing ring body.

By adopting the technical scheme, the U-shaped low-damping sealing ring for the double-acting hole comprises an annular sealing ring body arranged in the sealed hole, wherein an annular groove is formed in the outer peripheral surface of the sealing ring body, annular groove shoulders are respectively arranged on two sides of the groove, an inclined surface which obliquely extends from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder is arranged on the groove shoulder, and the outer diameter of the inner side edge of the groove shoulder is larger than the inner diameter of the hole; the outer diameter of the outer side edge of the groove shoulder is smaller than or equal to the inner diameter of the hole; when the sealing ring is used, hydraulic oil applies pressure from a small gap between the outer side edge of the groove shoulder and the hole matching surface, so that the outer peripheral surface of the groove shoulder deforms and forms a small gap channel with the hole matching surface, the hydraulic oil enters the groove through the small gap channel, the groove is filled with the hydraulic oil and applies pressure to the sealing ring body through the inner arc surface of the groove, the sealing ring body deforms, two side surfaces and the outer peripheral surface of the sealing ring body are tightly pressed on the inner wall of the sealing ring mounting groove, and the inner side edge of the groove shoulder at the other side is tightly pressed on the inner wall of the hole due to the fact that the inner side pressure is larger than the outer side pressure, so that the hydraulic oil cannot flow out from the side to realize sealing; when the other side is supplied with hydraulic oil, the sealing principle is the same.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is a schematic structural view of a groove having an inner surface of a circular arc surface according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a groove having a plurality of continuous folds on the inner surface;

FIG. 3 is an enlarged view taken at I in FIG. 1;

FIG. 4 is an assembly schematic of an embodiment of the present invention;

FIG. 5 is a schematic view of an installation state of the embodiment of the present invention in which the inner ring inclined surface of the second groove shoulder is pressed against the mating surface of the shaft;

FIG. 6 is a schematic view of the flow of hydraulic oil in a sealed state according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating the flow of hydraulic oil in the oil-passing state according to the embodiment of the present invention;

FIG. 8 is a schematic view of an embodiment of the present invention in which the inner surface of the annular groove is a plurality of continuous folds;

FIG. 9 is a schematic view of the structure of the embodiment of the present invention applied to the piston of the hydraulic cylinder;

in the figure: 1-a seal ring body; 2-a groove; 3-a groove shoulder; 4-a retainer ring.

Detailed Description

The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

As shown in fig. 1 and 3, the U-shaped low-damping seal ring for a dual-purpose hole comprises an annular seal ring body 1 installed in a sealed hole, an annular groove 2 is formed in the outer peripheral surface of the seal ring body 1, annular groove shoulders 3 are respectively arranged on two sides of the groove 2, an inclined surface which obliquely extends from the outer side edge to the inner side edge of the groove shoulder 3 is arranged on the groove shoulder 3, and the outer diameter of the inner side edge of the groove shoulder 3 is larger than the inner diameter of the hole; the outer diameter of the outer side edge of the groove shoulder 3 is smaller than or equal to the inner diameter of the hole. The groove 2 is arranged in the center of the outer peripheral surface of the sealing ring body 1.

The inner surface of the groove 2 is an arc surface.

As shown in fig. 3 and 4, an included angle β of 5 ° to 20 ° is formed between the annular outer surface of the groove shoulder 3 and the inner surface of the hole in an uninstalled state, and in fig. 4, a part of the structure interferes with the fitting part if the groove shoulder 3 is not compressed and deformed, and in fig. 4, the interference part is shown by a dotted line, and this is only done to show a comparison of the form before and after the assembling of the groove shoulder 3, and fig. 5 shows the structure form in the installed state.

As shown in fig. 5, in the installed state, the annular outer surface of the groove shoulder 3 and the inner surface of the hole are pressed together, and the outer edges of the pressing contact surfaces of the two have a narrow gap, and the length of the narrow gap is 5% to 20% of the length of the pressing contact surface.

An annular retainer ring 4 for eliminating a gap is arranged in the mounting groove at one side or two sides of the sealing ring body 1, as shown in fig. 9.

As shown in fig. 2 and 8, the inner surface of the groove 2 is a circular arc-like surface composed of a plurality of continuous folded surfaces. The sealing ring material is soft polytetrafluoroethylene or medium-hard butadiene-acrylonitrile rubber.

This two structural feature of U type low damping sealing washer for action hole:

1. the U-shaped low-damping sealing ring for the dual-action hole is a bidirectional sealing structure. As shown in fig. 6 and 7, pressure oil on two sides of the sealing ring can enter the sealing ring groove 2, but the pressure oil in the groove 2 can not flow out from the oil inlet side, and the oil pressure in the groove 2 can realize the reliable compression of all connecting surfaces of the sealing ring.

In fig. 6 and 7, the fitting surfaces on both sides of the seal ring are drawn with a wide gap, which is an enlarged process for clearly expressing the flow direction of the hydraulic pressure.

2. When the oil pressure outside the sealing ring is enough, the U-shaped low-damping sealing ring for the double-acting hole can realize that pressure oil enters the sealing ring groove 2. The outer peripheral surfaces of the groove shoulders 3 on the two sides of the sealing ring are designed to be inclined, so that pressure oil can enter the inner side groove 2 from the outer side of the sealing ring. The design of recess 2 can save pressure oil, guarantees stable sealed.

3. The inclined plane design of the groove shoulder 3 at a certain angle on the outer side of the sealing ring can ensure that pressure oil smoothly enters the groove 2 from the outer side but cannot flow out of the groove 2. The outside pressure oil exerts pressure at the outside edge of the inclined plane, so that a gap channel is formed on the contact surface of the sealing ring, and the hydraulic oil enters the groove 2. After the oil pressure in the groove 2 ensures the compression, the attaching force on the inner side of the groove 2 is larger than the attaching force on the outer side, and the reliable sealing is realized.

4. The inclined plane design of the peripheral surface of the groove 2 and the groove shoulder 3 forms stable sealing. The pressure in the groove 2 enables the whole groove 2 to deform along the direction of the curved surface, the deformation force enables the groove 2 to press two side surfaces and the inner circumferential surface of the sealing ring body 1 on one hand, meanwhile, the micro deformation generated by the deformation force enables two inclined side surfaces of the sealing ring to be pressed, and the micro deformation generated by the pressing force enables the sealing surface to generate certain pressure, so that the sealing ring and all contact surfaces generate pressing force.

5. The width of the sealing joint surface of the U-shaped low-damping sealing ring for the dual-purpose hole is small, the resistance during movement is small, and the joint force generated is smaller than that of other common sealing rings.

6. Adopt recess 2 design sealing washer, all can compress tightly two sides and the inner peripheral surface of sealing washer body 1 in recess 2, this kind of mode makes the sealing washer can not distort or overturn when high-mobility, and the design of sealing washer both sides groove shoulder 3 is upper narrow wide structure down simultaneously, has also guaranteed that the sealing washer can not distort or overturn.

7. The groove 2 can be designed into an arc-shaped surface consisting of a plurality of continuous folding surfaces, and can achieve good sealing effect.

8. The groove shoulders 3 on the two sides of the sealing ring are in a trapezoidal design, so that the joint surfaces can be effectively supported to be tightly jointed, and reliable sealing is realized.

9. The sealing design of the deep groove 2 on the inner side of the sealing ring ensures that pressure oil compresses the contact surface of the sealing ring, so that a good sealing effect can be achieved, and stable sealing is realized. Pressure oil enters the groove 2 from one side, certain pressure is kept in the groove 2, the oil pressure reliably enables the oil inlet side of the sealing ring to be tightly attached to the contact surface, stable sealing is achieved, and the sealing principle is different from that of the conventional sealing method

10. The axial gap between the two sides of the sealing ring and the mounting groove is in a small clearance fit state, if the gap is large, the polytetrafluoroethylene check ring 4 without a gap with the fitting surface is used, high-pressure oil is prevented from extruding the sealing ring into the fitting gap, and the sealing effect of the sealing ring is reduced or the sealing ring is damaged.

11. The difference from the conventional sealing ring in use is as follows: a gapless retainer ring 4 is additionally arranged on one side of the inclined groove shoulder 3 to ensure that no pressure oil exists on the two outer side surfaces of the sealing ring, so that the pressure oil in the groove 2 achieves a good sealing effect, and the conventional sealing ring must ensure that the oil pressure on the outer side is compressed.

The working principle is as follows:

taking the sealing ring as an example for explanation, as shown in fig. 9, when the sealing ring is mounted on a piston, the axial direction moves to the left, the contact area between the left inclined plane part of the low-damping sealing ring and the upper part is smaller, hydraulic oil presses down the inclined plane of the groove shoulder 3 under the action of pressure to generate a small gap channel, so that the oil enters the groove 2 of the sealing ring, the volume of the hydraulic oil in the groove 2 is unchanged, and since the groove shoulder 3 on the right side of the sealing ring is also designed as an inclined plane, the hydraulic oil entering the groove 2 and having a certain pressure compresses all the contact surfaces of the sealing ring, and the hydraulic oil cannot flow out from the right side; in a similar way, the shaft moves rightwards, the inclined plane part inclining to the right side of the low-damping sealing ring is smaller than the contact area of the upper part, hydraulic oil presses down the inclined plane of the groove shoulder 3 under the action of pressure to generate a small gap, so that the oil enters the sealing ring groove 2, the volume of the hydraulic oil in the groove 2 is unchanged, the groove shoulder 3 on the left side of the sealing ring is also designed as an inclined plane, the hydraulic oil with certain pressure in the entering groove 2 compresses all the sealing ring contact surfaces, and the hydraulic oil can not flow out from the right side. Therefore, both sides of the sealing ring can realize stable sealing.

In fig. 9, the retainer rings 4 for eliminating the gap are installed on both sides of the seal ring.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.