阅读说明：本技术 双作用轴用u型低阻尼密封圈 (U-shaped low-damping sealing ring for double-acting shaft ) 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轴用U型低阻尼密封圈,包括密封圈本体,密封圈本体上设置有环状凹槽,凹槽的两侧分别设置有一个环状槽肩,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,槽肩外侧边沿的内径小于其内侧边沿的内径,槽肩内侧边沿的内径大于轴的外径,槽肩外侧边沿的内径小于或等于轴的外径；使用时,液压油从槽肩外侧边沿与轴配合面之间的小缝隙施加压力,使得槽肩的内周面变形并与轴配合面之间形成小缝隙通道,液压油通过小缝隙通道进入到凹槽内,液压油通过凹槽的内弧面施加压力,使其产生变形并被压紧,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轴上,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 shaft, which comprises a sealing ring body, wherein an annular 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 to the inner side edge of the groove shoulder is arranged on the groove shoulder, the inner diameter of the outer side edge of the groove shoulder is smaller than the inner diameter of the inner side edge of the groove shoulder, the inner diameter of the inner side edge of the groove shoulder is larger than the outer diameter of the shaft, and the inner diameter of the outer side edge of the groove shoulder is smaller than or equal to the outer diameter of the shaft; when the hydraulic oil sealing device is used, pressure is applied to the small gap between the outer side edge of the groove shoulder and the shaft matching surface, so that the inner circumferential surface of the groove shoulder deforms and a small gap channel is formed between the inner circumferential surface of the groove shoulder and the shaft matching surface, the hydraulic oil enters the groove through the small gap channel, the hydraulic oil applies pressure through the inner arc surface of the groove, the groove shoulder deforms and is pressed tightly, the inner side edge of the groove shoulder on the other side is pressed tightly on the shaft due to the fact that the inner side pressure is larger than the outer side pressure, and therefore the hydraulic oil cannot flow out from the side, and sealing is achieved.)

1. Two effect U type low damping sealing washer for axle, its characterized in that: including the suit at epaxial annular seal circle body, the sealing washer body towards be provided with annular groove on the cyclic annular inner wall of axle, the both sides of recess are provided with an annular groove shoulder respectively, be provided with on the groove shoulder from its outside border to the inclined plane that its inboard side extends along the slope, the internal diameter at groove shoulder outside border is less than the internal diameter at its inboard border, the internal diameter at groove shoulder inboard border is greater than the external diameter of axle, the internal diameter at groove shoulder outside border is less than or equal to the external diameter of axle.

2. A double acting shaft seal of the U-type low damping as defined in claim 1 wherein: the inner surface of the groove is an arc-shaped surface.

3. A double acting shaft seal of the U-type low damping 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 double acting shaft seal of the U-type low damping as defined in claim 1 wherein: and in an uninstalled state, an included angle of 5-20 degrees is formed between the annular inner surface of the groove shoulder and the outer surface of the shaft.

5. A double acting shaft seal of the U-type low damping as defined in claim 1 wherein: under the installation state, the annular inner surface of groove shoulder with the surface of axle 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 double acting shaft seal of the U-type low damping as defined in claim 1 wherein: the groove is arranged in the center of the inner circumferential surface of the sealing ring body.

7. A double acting shaft seal of the type U with low damping as claimed in 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 shaft.

Background

The sealing ring for hydraulic pressure is widely applied to occasions such as pipelines and pressure vessels, the contact area of the sealing and laminating surface of the traditional O-shaped sealing ring is large, great resistance is generated during high-speed movement, distortion and overturning easily occur, the sealing performance is poor, great friction force can cause great abrasion during the working of the sealing ring, and the service life is shortened.

Disclosure of Invention

The invention aims to solve the technical problem of providing the U-shaped low-damping sealing ring for the double-acting shaft, 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 shaft comprises an annular sealing ring body sleeved on the shaft, wherein the sealing ring body faces an annular groove formed in the annular inner wall of the shaft, annular groove shoulders are respectively arranged on two sides of the groove, an inclined plane extending from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder in an inclined mode is arranged on the groove shoulder, the inner diameter of the outer side edge of the groove shoulder is smaller than the inner diameter of the inner side edge of the groove shoulder, the inner diameter of the inner side edge of the groove shoulder is larger than the outer diameter of the shaft, and the inner diameter of the outer side edge of the groove shoulder is smaller than or equal to the outer diameter of the shaft.

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 inner surface of the groove shoulder and the outer surface of the shaft.

As a preferable technical solution, in the installation state, the annular inner surface of the groove shoulder and the outer surface of the shaft are pressed together, and the outer edge of the pressing contact surface of the groove shoulder and the outer surface of the pressing contact surface of the shaft have a narrow gap, and the length of the narrow gap is 5% -20% of the length of the pressing contact surface.

As a preferable technical solution, the groove is provided in the center of the inner 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 shaft comprises an annular sealing ring body sleeved on the shaft, wherein an annular groove is formed in the annular inner wall, facing the shaft, of the sealing ring body, annular groove shoulders are respectively arranged on two sides of the groove, inclined planes which extend from the outer side edge of the groove shoulder to the inner side edge of the groove shoulder in an inclined mode are arranged on the groove shoulder, the inner diameter of the outer side edge of the groove shoulder is smaller than the inner diameter of the inner side edge of the groove shoulder, the inner diameter of the inner side edge of the groove shoulder is larger than the outer diameter of the shaft, and the inner diameter of the outer side edge of the groove shoulder is smaller than or equal to the outer diameter of the shaft; 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 shaft matching surface, so that the inner circumferential surface of the groove shoulder deforms and forms a small gap channel with the shaft 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 circumferential surface of the sealing ring body are pressed on the inner wall of the sealing ring mounting groove, the inner side edge of the groove shoulder at the other side is pressed on the shaft due to the fact that the inner side pressure is larger than the outer side pressure, and therefore the hydraulic oil cannot flow out from the side to achieve 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 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 diagram illustrating an exemplary application of the present invention;

in the figure: 1-axis; 2-a seal ring body; 3-a groove; 4-a groove shoulder; 5-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, 3 and 4, the U-shaped low-damping seal ring for the double-acting shaft includes an annular seal ring body 2 sleeved on a shaft 1, the seal ring body 2 faces an annular inner wall of the shaft 1 and is provided with an annular groove 3, two sides of the groove 3 are respectively provided with an annular groove shoulder 4, the groove shoulder 4 is provided with an inclined surface extending obliquely from an outer side edge to an inner side edge thereof, an inner diameter of the outer side edge of the groove shoulder 4 is smaller than an inner diameter of the inner side edge thereof, an inner diameter of the inner side edge of the groove shoulder 4 is larger than an outer diameter of the shaft 1, and an inner diameter of the outer side edge of the groove shoulder 4 is smaller than or equal to an outer diameter of the shaft 1. The groove 3 is arranged in the center of the inner circumferential surface of the seal ring body 2.

The inner surface of the groove 3 is an arc surface.

As shown in fig. 3 and 4, an included angle β of 5 ° to 20 ° is formed between the annular inner surface of the groove shoulder 4 and the outer surface of the shaft 1 in an uninstalled state, and in fig. 4, a part of the structure interferes with the assembled parts if the groove shoulder 4 is not compressed and deformed, and the interference part is shown by a dotted line in fig. 4, which is only processed to show a comparison of the form before and after the assembly of the groove shoulder 4, and fig. 5 shows the structure form in the installed state.

As shown in fig. 5, in the installed state, the annular inner surface of the groove shoulder 4 is pressed against the outer surface of the shaft 1, and a narrow gap is formed along the outer edge of the pressing contact surface of the groove shoulder and the outer surface of the pressing contact surface, and the length of the narrow gap is 5% -20% of the length of the pressing contact surface.

An annular retainer ring 5 for eliminating a gap is arranged in the mounting groove on one side or two sides of the sealing ring body 2, and as shown in fig. 9, the retainer ring 5 is made of polytetrafluoroethylene retainer ring 5.

As shown in fig. 2 and 8, the inner surface of the concave groove 3 is an arc-like surface composed of a plurality of continuous folded surfaces. The sealing ring material is soft polytetrafluoroethylene or medium-hard butadiene-acrylonitrile rubber.

The U-shaped low-damping sealing ring for the double-acting shaft has the following structural characteristics:

1. the double-acting shaft 1 is a bidirectional sealing structure with a U-shaped low-damping sealing ring. As shown in fig. 6 and 7, pressure oil on both sides of the sealing ring can enter the groove 3 of the sealing ring, but the pressure oil in the groove 3 cannot flow out from the other side of the oil inlet, and the oil pressure in the groove 3 can realize 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 double-acting shaft 1 can realize that pressure oil enters the sealing ring groove 3 by using the U-shaped low-damping sealing ring. The groove shoulders 4 designed at the two sides of the sealing ring are inclined, so that pressure oil can enter the inner side groove 3 from the outer side of the sealing ring. The design of recess 3 can save pressure oil, guarantees stable sealed.

3. The groove shoulder 4 designed with the inclined plane with a certain angle at the outer side of the sealing ring can ensure that pressure oil smoothly enters the groove 3 from the outer side, but cannot flow out of the groove 3. The pressure oil on the outer side exerts pressure on the inclined plane, so that a gap is formed between the groove shoulder 4 of the sealing ring and the contact surface of the shaft 1, and the hydraulic oil enters the groove 3. After the oil pressure in the groove 3 ensures the compression, the attaching force on the inner side of the groove 3 is larger than the attaching force on the outer side, and the reliable sealing is realized.

4. The groove 3 and the groove shoulder 4 of the sealing ring are designed into a stable sealing. The pressure in the groove 3 enables the whole groove 3 to deform along the direction of the curved surface, the deformation force enables the groove 3 to press two side surfaces and the peripheral surface of the sealing ring body 2 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 double-acting shaft 1 is small in sealing width of the U-shaped low-damping sealing ring, small in resistance during movement, and small in generated fitting force compared with other common sealing rings.

6. Adopt recess 3 design sealing washer, hydraulic oil in recess 3 all can compress tightly two sides and the outer peripheral face of sealing washer body 2, and this kind of mode makes the sealing washer can not distort or overturn when high-mobility, and the groove shoulder 4 design of sealing washer both sides is upper narrow wide structure down simultaneously, has also guaranteed that the sealing washer can not distort or overturn.

7. The groove 3 can be designed to be arc-shaped, and a plurality of continuous folding surfaces form a shape similar to an arc line, so that a good sealing effect can be achieved.

8. The groove shoulders 4 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 3 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 3 from one side, certain pressure is kept in the groove 3, 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 5 without a gap with the matching surface is used, high-pressure oil is prevented from extruding the sealing ring into the matching 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 5 is additionally arranged on the outer side of the inclined groove shoulder 4 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 3 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:

when the pressure on the left side of the sealing ring is larger, the contact area between the inclined surface of the groove shoulder 4 on the left side of the low-damping sealing ring and the matching surface of the shaft 1 is small, a small gap is formed between the outer side of the inclined surface of the groove shoulder 4 and the matching surface of the shaft 1, hydraulic oil extrudes the inclined surface of the groove shoulder 4 under the action of pressure to generate a small gap channel, so that the hydraulic oil enters the groove 3 of the sealing ring from the left side, the volume of the hydraulic oil in the groove 3 is unchanged, and the hydraulic oil entering the groove 3 and having a certain pressure compresses the outer contact surfaces of all the sealing rings because the groove shoulder 4 on the right side of the sealing ring is also designed as an inclined surface, so that the hydraulic oil cannot flow out from the right side; in the same way, when sealing washer right side pressure is great, 4 inclined planes of low damping sealing washer right side groove shoulder are little with the fitting surface area of axle 1, hydraulic oil extrudes 4 inclined planes of groove shoulder under the pressure effect, produce little gap channel, make oil get into sealing washer recess 3, the hydraulic oil volume is unchangeable in the recess 3, because sealing washer left side groove shoulder 4 also is the inclined plane design, the hydraulic oil that has certain pressure in the entering recess 3 compresses tightly all sealing washer contact surfaces, make hydraulic oil can't follow the right side and flow out. Therefore, both sides of the sealing ring can realize stable sealing.

As shown in fig. 9, the sealing ring is an application example of the sealing ring, and the sealing ring can isolate pressure oil and high-pressure gas at two sides, thereby achieving a good sealing effect. In fig. 9, polytetrafluoroethylene retainers 5 are attached to both axial 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.