Y-shaped sealing ring for guide sleeve of hydraulic jack

Abstract

The utility model belongs to the technical field of mechanical sealing elements, and discloses a Y-shaped sealing ring for a hydraulic jack guide sleeve, which comprises an annular sealing body, an outer lip and an inner lip, the outer lip and the inner lip are respectively and fixedly arranged on the sealing body, a gap is arranged between the outer lip and the inner lip, and the outer side of the outer lip protrudes outwards to form a circle of arc-shaped protrusion. The sealing effect of the sealing device is not affected by installation factors, the sealing effect is greatly improved, and the sealing device is suitable for sealing a gap between the guide sleeve and the outer cylinder barrel of the hydraulic oil cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals and relates to a Y-shaped sealing ring, in particular to a Y-shaped sealing ring for a guide sleeve of a hydraulic jack. Background Art

[0002] The Y-shaped sealing ring is an important sealing component for sealing the hydraulic medium of the hydraulic jack. It is installed in the groove between the outer cylinder and the guide sleeve of the jack, and seals the gap between the guide ring and the outer cylinder. The Y-shaped sealing ring includes an outer lip and an inner lip, and the outer lip abuts against the outer wall of the groove. In the prior art, a circle of sharp-angled protrusions is provided on the surface of the outer lip abutting against the outer cylinder, and the bend of the sharp-angled protrusion forms a line that is tightly attached to the inner wall of the outer cylinder to form a line seal. However, the existing Y-type sealing ring does not seal well under the low-pressure state of hydraulic oil, and leakage or even loss of sealing may occur. The reason is that, in an ideal state, the angle structure on the outside of the outer lip is close to the inner wall of the outer cylinder. However, in actual use, the Y-type sealing ring will be pressed into the groove with force during the installation process, and it is difficult to control the force. When the guide sleeve with the Y-type sealing ring is pushed to the specified position of the outer cylinder, it cannot be guaranteed that the sealing will stop when a circle of angles is exactly on a horizontal plane. If the installation force is excessive, it is easy to cause the upper side of the angle to be close to the outer wall of the outer cylinder, while the lower side of the angle is close to the inner wall of the outer cylinder, resulting in the outermost circle fold line not being evenly on a straight line, forming an S-shaped distortion, and then creating a gap with the inner wall of the outer cylinder, so that the sealing medium seeps out of the gap, causing sealing leakage. Utility Model Content

[0003] In order to solve the above deficiencies in the prior art, the utility model aims to provide a Y-shaped sealing ring for a hydraulic jack guide sleeve, so as to achieve the purpose of improving the sealing effect under low pressure conditions.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A Y-shaped sealing ring for a hydraulic jack guide sleeve comprises an annular sealing body and an outer lip and an inner lip respectively fixed on the sealing body, a gap is provided between the outer lip and the inner lip, and the outer side of the outer lip protrudes outward to form a circle of arc-shaped protrusions.

[0006] As a limitation of the present invention, the length of the inner lip is greater than the length of the outer lip.

[0007] As another limitation of the present invention, the outer side of the sealing body protrudes outward to form a circle of sealing protrusions.

[0008] As a limitation of the present invention, the cross-section of the sealing protrusion is triangular, arc-shaped or trapezoidal.

[0009] As a third limitation of the present utility model, the outer side of the inner lip protrudes outward to form a corner protrusion.

[0010] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0011] (1) During installation, no matter if too much force is applied or the sealing ring is twisted, the outer lip is provided with an arc-shaped protrusion, which can achieve a smooth transition. The contact between the arc-shaped protrusion and the inner wall of the outer cylinder at any position is the contact between the tangent of the arc-shaped protrusion and the inner wall of the outer cylinder, and no turning point after the angle twisting will be generated. Linear sealing can be formed. When the hydraulic oil is under low pressure, the sealing performance can be guaranteed and will not be affected by installation factors. The sealing effect is greatly improved.

[0012] (2) The length of the outer lip of the utility model is relatively short, which facilitates the hydraulic oil to enter the gap between the inner lip and the outer lip. The inner lip and the outer lip are pushed away from each other by the pressure of the hydraulic oil, so that the inner lip is closely attached to the groove wall and the outer lip is closely attached to the outer cylinder wall, thereby improving the sealing effect under high pressure;

[0013] (3) The sealing protrusion on the sealing body of the utility model can further form a secondary protection through interference contact sealing, thereby improving the sealing effect.

[0014] In summary, the sealing effect of the utility model is not affected by installation factors, the sealing effect is greatly improved, and the utility model is suitable for sealing the gap between the guide sleeve and the outer cylinder barrel of the hydraulic oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model installed in the outer cylinder and the guide sleeve groove.

[0018] In the figure: 1, sealing body; 11, sealing protrusion; 2, outer lip; 21, arc-shaped protrusion, 3, inner lip; 31, corner protrusion; 4, outer cylinder; 5, guide sleeve; 6, groove. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0020] Embodiment A Y-type sealing ring for a hydraulic jack guide sleeve

[0021] like Figure 1 As shown, it includes an annular sealing body 1 and an outer lip 2 and an inner lip 3 respectively fixed on the sealing body 1, wherein the sealing body 1, the outer lip 2 and the inner lip 3 are integrally arranged, a gap is provided between the outer lip 2 and the inner lip 3 to form a Y shape, and the portion where the outer lip 2 and the inner lip 3 are connected is an arc transition.

[0022] The outer side of the outer lip 2 protrudes outward to form a circle of arc-shaped protrusions 21, which are used to stick to the inner and outer walls of the outer cylinder 4. During installation, the Y-shaped sealing ring is first sleeved in the groove 6 of the guide sleeve 5, and then the guide sleeve 5 with the Y-shaped sealing ring is inserted into the outer cylinder 4. In this process, since the Y-shaped sealing ring and the groove 6 are interference fit, it is necessary to use external force to squeeze the Y-shaped sealing ring and the outer wall of the outer cylinder 4 to push the guide sleeve 5 to a specified position. When the arc-shaped protrusion 21 of the outer lip 2 contacts the inner wall of the outer cylinder 4, no matter how the arc-shaped protrusion 21 and the inner wall of the outer cylinder 4 are deformed and squeezed, the arc structure can still form an arc-shaped tangent to fit the inner wall of the outer cylinder 4, forming a line surface seal with a good sealing effect. Even under low pressure, the pressure of the hydraulic oil has limited effect on the expansion of the inner lip 3 and the outer lip 2, and no leakage will occur.

[0023] The length of the inner lip 3 is greater than the length of the outer lip 2, that is, Figure 1 L2-L1>0, the height difference between the two can promote the hydraulic oil to enter the gap between the outer lip 2 and the inner lip 3. Through the pressure of the hydraulic oil, the outer lip 2 and the inner lip 3 can be stretched to both sides, so that the outer lip 2 fits tightly against the inner wall of the outer cylinder 4, and the inner lip 3 fits tightly against the inner wall of the groove 6 on the guide sleeve 5, further improving the sealing effect.

[0024] The outer side of the sealing body 1 protrudes outward to form a circle of sealing protrusions 11. The cross-section of the sealing protrusions 11 is triangular, arc-shaped or trapezoidal. This embodiment adopts a trapezoidal shape. The sealing protrusions 11 fit against the inner wall of the outer cylinder 4 to form a secondary sealing guarantee, further ensuring the sealing effect and preventing leakage.

[0025] The outer side of the inner lip 3 protrudes outward to form a folded corner protrusion 31, and the folded corner protrusion 31 is tightly fitted with the inner wall of the groove 6 to form a triple seal to ensure the sealing effect.

[0026] When using this embodiment, the Y-shaped sealing ring is installed in the groove 6 between the inner wall of the outer cylinder 4 and the guide sleeve 5 by extrusion, so that the outer lip 2 contacts the outer cylinder 4 and the inner lip 3 contacts the inner wall of the groove 6, thereby achieving a sealing effect.

[0027] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A Y-shaped sealing ring for a guide sleeve of a hydraulic jack, comprising an annular sealing body and an outer lip and an inner lip respectively fixed on the sealing body, with a gap between the outer lip and the inner lip, characterized in that: The outer side of the outer lip protrudes outward to form a circle of arc-shaped protrusions.

2. The Y-shaped sealing ring for a hydraulic jack guide sleeve according to claim 1, characterized in that: The length of the inner lip is greater than that of the outer lip.

3. A Y-shaped sealing ring for a hydraulic jack guide sleeve according to claim 1 or 2, characterized in that: The outer side of the sealing body protrudes outward to form a circle of sealing protrusions.

4. The Y-shaped sealing ring for a hydraulic jack guide sleeve according to claim 3, characterized in that: The cross section of the sealing protrusion is triangular, arc-shaped or trapezoidal.

5. A Y-shaped sealing ring for a hydraulic jack guide sleeve according to any one of claims 1, 2 and 4, characterized in that: The outer side of the inner lip protrudes outward to form a corner protrusion.

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