Sealing structure for end part of oil cylinder

Abstract

The utility model provides an oil cylinder end part sealing structure, at least two circles of ring grooves which are arranged inside and outside and are concentric with a cylinder barrel are arranged on the end surface of the cylinder barrel, and the section of each ring groove is rectangular; in a free state, the lower part of the section of the sealing ring is rectangular, and the upper part is arc-shaped. According to the utility model, a multi-stage sealing structure is formed by matching a plurality of circles of concentric ring grooves with a sealing ring with a special section shape. The sealing ring is of a structure with the arc-shaped upper portion and the rectangular lower portion, after the sealing ring is installed in the annular groove and extruded by the cylinder cover to the arc-shaped portion, the whole annular groove can be smoothly filled, the sealing contact face between the sealing ring and the cylinder cover and the annular groove of the cylinder barrel is large, high-pressure impact can be reliably resisted, a hydraulic oil leakage path can be effectively blocked, and the sealing effect is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing technical field, concretely is a kind of oil cylinder end sealing structure. BACKGROUND

[0002] In hydraulic force standard machine, oil cylinder is as core executive component, bears the important task of converting hydraulic energy into mechanical energy. The performance stability and reliability of oil cylinder directly determine the force stability in the detection process of hydraulic force standard machine, and the sealing effect between oil cylinder cover and cylinder end face is one of the key factors to guarantee normal operation of oil cylinder.

[0003] Currently, in the sealing design of oil cylinder cover and cylinder end face, O-ring structure is usually used. In the installation process, O-ring is placed in the sealing groove of oil cylinder cover and cylinder end face, and when oil cylinder cover and cylinder body are assembled, O-ring is extruded to produce elastic deformation, thereby filling the gap between sealing groove and contact surface, forming a seal to prevent hydraulic oil from leaking from the inside of the oil cylinder to the outside environment.

[0004] However, with the rapid development of industrial technology, the force value demand of hydraulic force standard machine is increasing, and the working pressure of hydraulic system is increasing. In this high-pressure working environment, the limitations of O-ring structure are gradually exposed. Because the sealing contact surface formed between O-ring and oil cylinder cover and cylinder end face is relatively small, under the action of high-pressure hydraulic oil, the pressure distribution on the sealing contact surface becomes uneven. Under the continuous impact of high pressure, the local area of sealing contact surface will bear pressure far beyond the material bearing limit. This excessive pressure can cause serious elastic deformation of O-ring material in this area, and even local damage. Once the integrity of the sealing surface is damaged, hydraulic oil will gradually leak out through the small gap between the sealing material and the contact surface, forming oil leakage. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the utility model aims to provide an oil cylinder end sealing structure.

[0006] In order to achieve the above purpose, the utility model solves the technical problems by adopting the following technical scheme: an oil cylinder end sealing structure, the oil cylinder includes a cylinder barrel, a sealing ring and a cylinder cover;

[0007] At least two rings of inner and outer rings are arranged on the end face of the cylinder barrel and are concentric with the cylinder barrel, and the cross section of the ring groove is rectangular;

[0008] In a free state, the lower part of the cross section of the sealing ring is rectangular, and the upper part is arc-shaped, the depth of the ring groove is greater than the height of the bottom of the upper arc-shaped part of the sealing ring, and less than the height of the top of the upper arc-shaped part of the sealing ring, and the width of the lower part of the sealing ring is 0.4-1mm less than the width of the ring groove;

[0009] Each of the ring grooves is provided with the sealing ring, the lower surface of the cylinder cover is attached to the end surface of the cylinder barrel, and the cylinder cover extrudes the sealing ring in the ring groove.

[0010] The utility model discloses a multi-stage sealing structure formed by the cooperation of the multiple concentric ring grooves and the sealing ring with special cross section shape. The sealing ring has an upper arc-shaped part and a lower rectangular part. After the sealing ring is installed in the ring groove and is extruded by the arc-shaped part of the cylinder cover, the sealing ring can smoothly fill the whole ring groove. The sealing contact surface between the sealing ring and the cylinder cover and the ring groove of the cylinder barrel is large, can reliably resist high pressure impact, and can effectively block the hydraulic oil leakage path, thereby significantly improving the sealing effect.

[0011] Further, the ratio of the depth to the width of the ring groove is 0.5-0.65.

[0012] By adopting the above preferred scheme, the appropriate ratio of the depth to the width of the ring groove can provide sufficient support for the sealing ring and enhance the stability of the sealing structure in a high pressure environment.

[0013] Further, in a free state, the cross-sectional area of the sealing ring is 1-1.1 times the cross-sectional area of the ring groove.

[0014] By adopting the above preferred scheme, after the sealing ring is extruded by the cylinder cover, the sealing ring can fully fill the ring groove space, form a tight sealing effect, and effectively prevent hydraulic oil leakage.

[0015] Further, the intersection between the bottom surface and the side wall of the ring groove is provided with a rounded corner with an R0.5, and the intersection between the bottom surface and the side surface of the sealing ring is provided with a chamfer with a C0.5.

[0016] By adopting the above preferred scheme, the chamfer design of the sealing ring helps the sealing ring to be smoothly installed into the ring groove and reduces the installation resistance.

[0017] Further, the edge corner of the mouth part of the ring groove is provided with a rounded corner with an R0.2.

[0018] By adopting the above preferred scheme, the rounded corner design can avoid scratching the sealing ring during installation, and further improves the service life and sealing reliability of the sealing ring.

[0019] Further, the edge part of the end surface of the cylinder barrel is provided with a stop face lower than the end surface where the mouth part of the ring groove is located, and the lower surface of the cylinder cover is provided with an outwardly convex ring platform matched with the stop face.

[0020] With the preferred scheme, the cooperation between the stop face and the ring table can play the role of accurate positioning during installation, preventing the mispositioning of the cylinder cover and the cylinder barrel, ensuring the uniform stress of the sealing ring, and improving the sealing effect.

[0021] Further, the annular flat washer is arranged between the stop face of the cylinder barrel end face and the ring table of the cylinder cover.

[0022] With the preferred scheme, the annular flat washer can further enhance the sealing performance of the connection between the cylinder barrel and the cylinder cover, and simultaneously play the role of buffering and shock absorption, reducing the risk of sealing failure caused by vibration.

[0023] Further, the stop face of the cylinder barrel is provided with a circumferential array of threaded holes, the cylinder cover and the cylinder barrel are connected through bolts, and the number of the bolts is not less than 6.

[0024] With the preferred scheme, the circumferential array of the multiple bolts can make the connection between the cylinder cover and the cylinder barrel more stable, ensure that the sealing ring is uniformly extruded, and maintain a good sealing state. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 is a structural schematic view of the present application.

[0027] Figure 2 is a top view of the cylinder barrel of the present application.

[0028] Figure 3 is a sectional view of the cylinder barrel of the present application.

[0029] Figure 4 is Figure 3 is a local enlarged view of A in FIG.

[0030] Figure 5 is an enlarged view of the ring groove.

[0031] Figure 6 is a sectional view of the sealing ring of the present application.

[0032] Names of corresponding parts represented by numbers and letters in the figure:

[0033] 10-cylinder barrel; 11-ring groove; 12-stop face; 13-threaded hole; 20-sealing ring; 30-cylinder cover; 40-annular flat washer. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] like Figures 1-6 As shown, one embodiment of this utility model is: a cylinder end sealing structure, the cylinder including cylinder barrel 10, sealing ring 20 and cylinder cover 30;

[0036] At least two annular grooves 11 are provided on the end face of the cylinder barrel 10, which are arranged inside and outside the cylinder barrel and are concentric with the cylinder barrel. The cross-section of the annular grooves 11 is rectangular.

[0037] In the free state, the lower part of the cross section of the sealing ring 20 is rectangular and the upper part is arc-shaped. The depth h1 of the annular groove 11 is greater than the bottom height h2 of the upper arc of the sealing ring 20 and less than the top height h3 of the upper arc of the sealing ring 20. The lower width b2 of the sealing ring 20 is 0.4-1mm smaller than the width b1 of the annular groove 11.

[0038] Each annular groove 11 is provided with a sealing ring 20. The lower surface of the cylinder head 30 is in contact with the end face of the cylinder barrel 10, and the cylinder head 30 presses the sealing ring 20 into the annular groove 11.

[0039] The beneficial effects of adopting the above technical solution are as follows: A multi-level sealing structure is formed by combining multiple concentric annular grooves with a sealing ring of a special cross-sectional shape. The sealing ring adopts an upper arc-shaped and lower rectangular structure. After the sealing ring is installed in the annular groove, it can smoothly fill the entire annular groove after being squeezed by the cylinder head against the arc-shaped part. The sealing contact surface between the sealing ring and the cylinder head and cylinder barrel annular groove is large, which can reliably withstand high-pressure impacts, effectively block hydraulic oil leakage paths, and significantly improve the sealing effect.

[0040] In some other embodiments of this invention, the ratio of the depth h1 to the width b1 of the annular groove 11 is 0.5-0.65. The beneficial effect of adopting the above technical solution is that a suitable ratio of annular groove depth to width can provide sufficient support for the sealing ring, enhancing the stability of the sealing structure under high pressure.

[0041] In some other embodiments of this invention, in the free state, the cross-sectional area of ​​the sealing ring 20 is 1-1.1 times the cross-sectional area of ​​the annular groove 11. The beneficial effect of adopting the above technical solution is that the sealing ring, after being compressed by the cylinder head, can fully fill the annular groove space, forming a tight seal and effectively preventing hydraulic oil leakage.

[0042] In some other embodiments of the present application, the junction of the bottom surface of the annular groove 11 and the side wall is provided with a rounded corner with a radius of R0.5, and the junction of the bottom surface and the side surface of the sealing ring 20 is provided with a chamfer with a radius of C0.5. The beneficial effect of the above technical solution is that the chamfer design of the sealing ring helps it to be smoothly installed into the annular groove, reducing the installation resistance.

[0043] In some other embodiments of the present application, the edge corner of the mouth of the annular groove 11 is provided with a rounded corner with a radius of R0.2. The beneficial effect of the above technical solution is that the rounded corner design can avoid scratching the sealing ring during installation, further improving the service life and sealing reliability of the sealing ring.

[0044] In some other embodiments of the present application, the edge of the end surface of the cylinder barrel 10 is provided with a stop surface 12 lower than the end surface where the annular groove mouth is located, and the lower surface of the cylinder cover 30 is provided with an annular platform protruding outward and matching the stop surface. The beneficial effect of the above technical solution is that the cooperation of the stop surface and the annular platform can play a role in precise positioning during installation, preventing misalignment of the cylinder cover and the cylinder barrel, ensuring uniform stress on the sealing ring, and improving the sealing effect.

[0045] In some other embodiments of the present application, an annular flat washer 40 is arranged between the stop surface 12 of the end surface of the cylinder barrel 10 and the annular platform of the cylinder cover 30. The beneficial effect of the above technical solution is that the annular flat washer can further enhance the sealing performance of the connection between the cylinder barrel and the cylinder cover, and also play a role in shock absorption, reducing the risk of sealing failure caused by vibration.

[0046] In some other embodiments of the present application, the stop surface 12 of the cylinder barrel 10 is provided with a circumferential array of threaded holes 13, and the cylinder cover 30 and the cylinder barrel 10 are connected by bolts, and the number of bolts is not less than 6. The beneficial effect of the above technical solution is that the circumferential array of multiple bolts can make the connection between the cylinder cover and the cylinder barrel more stable, ensuring that the sealing ring is subjected to uniform extrusion pressure and maintaining a good sealing state.

[0047] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A cylinder end seal structure, characterized by, The oil cylinder comprises a cylinder barrel, a sealing ring and a cylinder cover. At least two annular grooves are arranged on the end face of the cylinder barrel and concentric with the cylinder barrel, and the cross section of the annular groove is rectangular. In the free state, the lower part of the cross section of the sealing ring is rectangular, and the upper part is arc-shaped, the depth of the annular groove is greater than the height of the bottom of the upper arc-shaped part of the sealing ring, and less than the height of the top of the upper arc-shaped part of the sealing ring, and the width of the lower part of the sealing ring is 0.4-1mm less than the width of the annular groove. Each of the annular grooves is provided with the sealing ring, the lower surface of the cylinder cover is in close contact with the end face of the cylinder barrel, and the cylinder cover extrudes the sealing ring in the annular groove.

2. The rod end seal structure of claim 1, wherein The ratio of the depth to the width of the annular groove is 0.5-0.

65.

3. The rod end seal structure of claim 1, wherein In the free state, the cross-sectional area of the sealing ring is 1-1.1 times the cross-sectional area of the annular groove.

4. The rod end seal structure of claim 1, wherein The intersection between the bottom surface of the annular groove and the side wall is provided with a rounded corner with a radius of R0.5, and the intersection between the bottom surface of the sealing ring and the side surface is provided with a chamfer with a radius of C0.

5.

5. The rod end seal structure of claim 4, wherein The edge corner of the mouth of the annular groove is provided with a rounded corner with a radius of R0.

2.

6. The rod end seal structure of claim 1, wherein The edge of the end face of the cylinder barrel is provided with a stop face lower than the end face where the mouth of the annular groove is located, and the lower surface of the cylinder cover is provided with an annular platform protruding and matching the stop face.

7. The rod end seal structure of claim 6, wherein An annular flat washer is arranged between the stop face of the end face of the cylinder barrel and the annular platform of the cylinder cover.

8. The rod end seal structure of claim 7, wherein, The stop face of the cylinder barrel is provided with a circumferential array of threaded holes, the cylinder cover is connected with the cylinder barrel by bolts, and the number of bolts is not less than 6.

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