阅读说明：本技术 单作用轴用u型低阻尼密封圈 (U-shaped low-damping sealing ring for single-acting shaft ) 是由 李瑞川 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种单作用轴用U型低阻尼密封圈,包括套装在轴上的环状密封圈本体,密封圈本体上设置有环状凹槽,凹槽的两侧分别设置有第一槽肩和第二槽肩,第一槽肩的内径小于轴的外径,第二槽肩上设置有倾斜内周面,第二槽肩外侧边沿的内径小于其内侧边沿的内径,第二槽肩内侧边沿的内径大于轴的外径；第二槽肩外侧边沿的内径小于或等于轴的外径；液压油从第一槽肩处进入凹槽,通过对凹槽实施压力从而将密封圈本体的外周面和两个侧面压紧在密封圈安装槽内,第二槽肩内侧边沿的压力大于其外侧边沿的压力,第二槽肩被压紧在轴的外周壁上,凹槽和第二槽肩的设计使得密封圈在轴做高速运动的时候不会出现扭曲或翻转,实现可靠密封。(The invention discloses a U-shaped low-damping sealing ring for a single-acting shaft, which comprises an annular sealing ring body sleeved on the shaft, wherein an annular groove is formed in the sealing ring body, a first groove shoulder and a second groove shoulder are respectively arranged on two sides of the groove, the inner diameter of the first groove shoulder is smaller than the outer diameter of the shaft, an inclined inner circumferential surface is arranged on the second groove shoulder, the inner diameter of the outer side edge of the second groove shoulder is smaller than the inner diameter of the inner side edge of the second groove shoulder, and the inner diameter of the inner side edge of the second groove shoulder is larger than the outer diameter of the shaft; the inner diameter of the outer side edge of the second groove shoulder is smaller than or equal to the outer diameter of the shaft; hydraulic oil gets into the recess from first groove shoulder, thereby compresses tightly the outer peripheral face and two sides of sealing washer body in the sealing washer mounting groove through implementing pressure to the recess, and the pressure at the inboard border of second groove shoulder is greater than the pressure at its outside border, and the second groove shoulder is compressed tightly on the periphery wall of axle, and the design of recess and second groove shoulder makes the sealing washer can not appear warping or upset when the axle is high-speed motion, realizes reliably sealing.)

1. The single-acting shaft is with U type low damping sealing washer which characterized in that: the sealing ring comprises an annular sealing ring body sleeved on a 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, each groove shoulder comprises a first groove shoulder and a second groove shoulder, the inner diameter of each first groove shoulder is smaller than the outer diameter of the shaft, an inclined surface which obliquely extends from the outer side edge of each second groove shoulder to the inner side edge of each second groove shoulder is arranged on each second groove shoulder, the inner diameter of the outer side edge of each second groove shoulder is smaller than the inner diameter of the inner side edge of each second groove shoulder, and the inner diameter of the inner side edge of each second groove shoulder is larger than the outer diameter of the shaft; the inner diameter of the outer side edge of the second groove shoulder is smaller than or equal to the outer diameter of the shaft.

2. The U-shaped low-damping seal ring for a single acting shaft according to claim 1, wherein: the inner surface of the groove is an arc-shaped surface.

3. The U-shaped low-damping seal ring for a single acting shaft according to claim 1, wherein: the inner surface of the groove is an arc-like surface consisting of a plurality of continuous folding surfaces.

4. The U-shaped low-damping seal ring for a single acting shaft according to claim 1, wherein: and in an uninstalled state, an included angle of 5-20 degrees is formed between the annular inner surface of the second groove shoulder and the outer surface of the shaft.

5. The U-shaped low-damping seal ring for a single acting shaft according to claim 1, wherein: under the installation state, the annular inner surface of second groove shoulder with the surface of axle presses together, and both press the contact surface outer edge and have narrow gap, narrow gap's length is press 5% ~ 20% of contact surface length.

6. The U-shaped low-damping seal ring for a single acting shaft according to claim 1, wherein: the groove is arranged in the center of the inner circumferential surface of the sealing ring body.

7. The U-shaped low-damping seal ring for a single acting shaft 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 on the outer side of the second groove shoulder 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 single-acting shaft.

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 single-acting shaft, which has the advantages of good sealing effect, small damping area, small damping force, micro-deformation compensation effect 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 single-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, each groove shoulder comprises a first groove shoulder and a second groove shoulder, the inner diameter of each first groove shoulder is smaller than the outer diameter of the shaft, an inclined surface which obliquely extends from the outer side edge of each second groove shoulder to the inner side edge of each second groove shoulder is arranged on each second groove shoulder, the inner diameter of the outer side edge of each second groove shoulder is smaller than the inner diameter of the inner side edge of each second groove shoulder, and the inner diameter of the inner side edge of each second groove shoulder is larger than the outer diameter of the shaft; the inner diameter of the outer side edge of the second 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 second groove shoulder and the outer surface of the shaft.

As a preferable technical solution, in the mounted state, the annular inner surface of the second groove shoulder and the outer surface of the shaft are pressed together, and a narrow gap is formed along the outer edge of the pressing contact surface of the second groove shoulder and the outer surface of the pressing contact surface, and the length of the narrow gap is 5% to 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 solution, an annular retainer ring for eliminating a gap is installed in the installation groove outside the second groove shoulder of the seal ring body.

By adopting the technical scheme, the U-shaped low-damping sealing ring for the single-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, each groove shoulder comprises a first groove shoulder and a second groove shoulder, the inner diameter of each first groove shoulder is smaller than the outer diameter of the shaft, an inclined surface which obliquely extends from the outer side edge of each second groove shoulder to the inner side edge of each second groove shoulder is arranged on each second groove shoulder, the inner diameter of the outer side edge of each second groove shoulder is smaller than the inner diameter of the inner side edge of each second groove shoulder, and the inner diameter of the inner side edge of each second groove shoulder is larger than the outer diameter of the shaft; the inner diameter of the outer side edge of the second groove shoulder is smaller than or equal to the outer diameter of the shaft; during the use, hydraulic oil enters into annular groove from first groove shoulder, thereby hydraulic oil compresses tightly the outer peripheral face and two sides of sealing washer body in the sealing washer mounting groove through implementing pressure to annular groove, and the pressure at the inboard border of second groove shoulder is greater than the pressure at its outside border, so the second groove shoulder is compressed tightly on the periphery wall of axle, and the design of recess and second groove shoulder makes the sealing washer can not appear warping or upset when the axle is high-speed motion, realizes reliably sealing.

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 structural view of the hydraulic cylinder end cover to which the embodiment of the present invention is applied;

in the figure: 1-axis; 21-a seal ring body; 22-a groove; 31-a first groove shoulder; 32-a second 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, 3 and 4, the U-shaped low-damping seal ring for a single-acting shaft includes an annular seal ring body 21 sleeved on a shaft 1, wherein an annular groove 22 is formed in an annular inner wall of the seal ring body 21 facing the shaft 1, two sides of the groove 22 are respectively provided with an annular groove shoulder, the groove shoulder includes a first groove shoulder 31 and a second groove shoulder 32, an inner diameter of the first groove shoulder 31 is smaller than an outer diameter of the shaft 1, an inclined surface obliquely extending from an outer side edge to an inner side edge of the second groove shoulder 32 is formed on the second groove shoulder 32, an inner diameter of an outer side edge of the second groove shoulder 32 is smaller than an inner diameter of an inner side edge of the second groove shoulder 32, and an inner diameter of an inner side edge of the second groove shoulder 32 is larger than an outer diameter of the shaft 1; the inner diameter of the outer edge of the second groove shoulder 32 is smaller than or equal to the outer diameter of the shaft 1. The groove 22 is provided in the center of the inner peripheral surface of the seal ring body 21.

The inner surface of the groove 22 is a circular arc surface.

As shown in fig. 3 and 4, an included angle β of 10 ° to 15 ° is formed between the annular inner surface of the second groove shoulder 32 and the outer surface of the shaft 1 in an uninstalled state, and a part of the structure interferes with the assembled parts if the second groove shoulder 32 is not compressed and deformed in fig. 4, and the interference part is shown by a dotted line in fig. 4, which is only processed to show a comparison of the form of the second groove shoulder 32 before and after assembly, 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 second groove shoulder 32 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 second groove shoulder and the outer surface of the pressing contact surface, and the length of the narrow gap is 10% to 15% of the length of the pressing contact surface.

An annular retainer ring 4 for eliminating a gap is mounted in the mounting groove outside the second groove shoulder 32 of the seal ring body 21. The annular retainer ring 4 is a polytetrafluoroethylene retainer ring 4.

As shown in fig. 2 and 8, the inner surface of the concave groove 22 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 single action is structural feature of U type low damping sealing washer for axle:

1. the single-acting shaft can realize one-way sealing by using the U-shaped low-damping sealing ring. As shown in fig. 6, when the sealing ring is sealed from left to right, because the heights of the two sides of the sealing ring are different, the groove shoulder on the left side of the sealing ring is lower, and has a certain gap with the outer surface of the shaft 1, hydraulic oil can smoothly enter the annular groove 22 of the sealing ring, but pressure oil cannot flow out from the right side, and the pressure oil in the groove 22 can realize reliable sealing. As shown in fig. 7, if the hydraulic oil enters from the right side of the second groove shoulder 32, the hydraulic oil can easily flow out from the left first groove shoulder 31 due to a gap at the left first groove shoulder 31, and the right-to-left sealing cannot be realized. Similarly, when the installation directions are opposite, sealing from right to left can be realized; 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. The single acting shaft uses the U-shaped low damping seal ring to realize that the pressure oil at the two sides enters the seal ring groove 22. The U-shaped low-damping sealing ring for the single acting shaft is designed to have different heights of groove shoulders at two sides. When the sealing ring is used, as shown in fig. 6, when hydraulic oil comes from the left side, a certain gap is formed between the first groove shoulder 31 and the outer surface of the shaft 1, and the hydraulic oil can smoothly enter the groove 22 of the sealing ring; as shown in fig. 7, when the hydraulic oil is fed from the right side, the second groove shoulder 32 has a small area contact with the outer surface of the shaft 1, that is, a gap is formed between the outer edge of the second groove shoulder 32 and the outer surface of the shaft 1, and the outer pressure oil applies pressure on the inclined surface of the second groove shoulder 32, so that a small gap is formed between the second groove shoulder 32 and the outer surface of the shaft 1, and the pressure oil enters the groove 22.

3. Two sides of the low-damping sealing ring for the one-way shaft are designed in a high-low mode, as shown in fig. 6, the first groove shoulder 31 on the lower side enables hydraulic oil to smoothly enter the groove 22, and the second groove shoulder 32 on the higher side prevents the hydraulic oil in the groove 22 from continuously flowing rightwards, so that a good sealing effect is guaranteed.

4. The second groove shoulder 32 on the higher side of the sealing ring is designed to be an inclined plane with a certain angle, so that stable sealing of pressure oil in the groove 22 can be ensured. After the oil pressure in the groove 22 ensures the compression, the attaching force on the inner side of the groove 22 is larger than the attaching force on the outer side, and the reliable sealing is realized.

5. The groove 22 and second shoulder 32 slope design make up a stable seal. The pressure of the hydraulic oil in the groove 22 deforms the whole groove 22 along the direction of the curved surface, the deformation force enables the groove 22 to press two side surfaces and the peripheral surface of the sealing ring body 21 on one hand, meanwhile, the micro-deformation generated by the deformation force enables the inclined side surface of the second groove shoulder 32 of the sealing ring to press, 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.

6. The width of the groove shoulder binding surface on the sealing side of the sealing ring is small, the resistance is small during movement, and the binding force generated at the same time is smaller than that of other common sealing rings.

7. The structural design of the sealing ring ensures that the sealing ring cannot be seriously deformed during working. The sealing ring is designed by adopting the annular groove 22, two side surfaces and the peripheral surface of the sealing ring body 21 can be tightly pressed in the groove 22, the sealing ring cannot be distorted or overturned during height movement by the mode, and meanwhile, the second groove shoulder 32 of the sealing ring is designed to be of a structure with a narrow upper part and a wide lower part, so that the sealing ring cannot be distorted or overturned.

8. The groove 22 can be designed into a shape similar to a circular arc line formed by a plurality of continuous folding surfaces, and can achieve good sealing effect.

9. The trapezoidal design of the second groove shoulder 32 of the sealing ring can effectively support the joint surface to be tightly jointed, and reliable sealing is realized.

10. The inner side of the sealing ring is sealed by the deep annular groove 22, so that the contact surface of the sealing ring is tightly pressed by pressure oil, a good sealing effect can be achieved, and stable sealing is realized. Pressure oil enters the groove 22 from one side of the first groove shoulder 31, certain pressure is kept in the groove 22, the oil inlet side of the sealing ring is reliably attached to the contact surface by the oil pressure, stable sealing is achieved, and the sealing principle is different from that of a conventional sealing ring.

11. The axial clearance between the sealing ring and the fitting surface of the mounting groove is in a small clearance fit state, if the clearance is larger, the polytetrafluoroethylene check ring 4 without clearance with the fitting surface is used, the sealing ring is prevented from being extruded into the fitting clearance by high-pressure oil, and the sealing effect of the sealing ring is reduced or the sealing ring is damaged.

12. The difference from the conventional sealing ring in use is as follows: the gapless retainer ring 4 is added 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 22 achieves a good sealing effect, and the conventional sealing ring must ensure that the oil pressure on the outer side is compressed.

13. The one-way low-damping sealing ring can only realize one-way sealing, and the two sealing rings can be used as one two-way sealing ring when being symmetrically installed and used in certain specific occasions.

The working principle is as follows:

the mounting direction of the sealing ring is different, and left side sealing or right side sealing can be realized.

Sealing the left side: the sealing washer left side is lower during the installation, and first groove shoulder 31 is located the left side promptly, and left side hydraulic oil produces pressure, leaves the gap between low damping sealing washer left side and the axle 1, and hydraulic oil gets into sealing washer recess 22 smoothly, because the second groove shoulder 32 on sealing washer right side is the inclined plane design, and the pressure oil that gets into recess 22 compresses tightly the right side sealing washer, can't follow the right side and flow to realize the left side and seal.

And (3) sealing the right side: the sealing washer right side is lower during the installation, and first groove shoulder 31 is located the right side promptly, and right side hydraulic oil produces pressure, leaves the gap between low damping sealing washer right side and the axle 1, and hydraulic oil directly gets into sealing washer recess 22, because the left second groove shoulder 32 of sealing washer is the inclined plane design, and the pressure oil that gets into recess 22 compresses tightly the left side sealing washer, can't follow the left side and flow to realize that the right side is sealed.

Fig. 9 shows a cross-sectional view of the application of the sealing ring to the end cover of the hydraulic cylinder, where the two sides of the sealing ring are not tightly fitted to its mounting groove, so that the annular collar 4 is mounted on the outside of the second groove shoulder 32. The sealing ring seals oil in the hydraulic cylinder, and has a good sealing effect.

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.