Static sealing ring of hydraulic support reversing valve

Abstract

The utility model discloses a hydraulic support reversing valve static sealing ring which is characterized in that the sealing ring is an elastic sealing ring and comprises a base ring and a sealing ring body located on the outer side wall of the base ring. The section of the base ring is of a quadrilateral structure, and beveled edge structures are arranged on the outer side walls of the two ends of the base ring. The axial size of the sealing ring is smaller than that of the base ring, and the sealing ring is located in the center of the base ring. The utility model not only is convenient to install, but also can improve the anti-extrusion performance.

Description

Technical Field

[0001] The utility model relates to the field of seals, in particular to a static seal ring for a hydraulic support reversing valve. Background Art

[0002] As Figure 3 shown is a sealing structure used in a reversing valve of a coal mining machine hydraulic support. The sealing medium is water emulsion, and the maximum working pressure is 40 MPa. This sealing structure is formed by the cooperation of an O-ring 7 and a retaining ring 8. Since the O-ring 7 will have a rolling displacement during use and the stability is poor, it needs to be used in cooperation with the retaining ring 8. This sealing structure has defects in use: 1. Due to material factors of the retaining ring, it is too hard to be effectively stretched, and customers cannot achieve automatic installation; 2. It is necessary to install the retaining ring and the O-ring successively, resulting in a cumbersome installation process and low installation efficiency. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a static seal ring for a hydraulic support reversing valve, which can not only facilitate installation but also improve the extrusion resistance performance.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A static seal ring for a hydraulic support reversing valve, characterized in that: the seal ring is an elastic seal ring, and includes a base ring and a sealing ring located on the outer side wall of the base ring;

[0006] The cross-section of the base ring is a quadrilateral structure, and chamfered structures are provided on the outer side walls at both ends of the base ring;

[0007] The axial dimension of the sealing ring is smaller than the axial dimension of the base ring, and the sealing ring is located at the central position of the base ring.

[0008] Preferably, the outer side surface of the sealing ring is an arc structure.

[0009] Preferably, the seal ring is a pure polyurethane elastic seal ring.

[0010] Preferably, the sealing ring and the base ring are an integrally injection-molded structure.

[0011] The advantages of the utility model are:

[0012] 1. The seal ring can be stably assembled on the piston rod through the base ring, and the setting of the retaining ring can be saved. At the same time, the seal ring is an elastic structure, and it can be cooperated with mechanical equipment to expand it and then sleeved onto the installation position of the corresponding piston to achieve the function of automatic assembly;

[0013] 2. The sealing ring and the chamfered structure can keep the parts on the sealing ring as far away as possible from the gap between the piston and the cylinder block, thus effectively preventing the end of the sealing ring or the base ring from being squeezed into the gap between the piston and the cylinder block, and improving the extrusion resistance performance of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a partial cross-sectional view of the static sealing ring of the hydraulic support reversing valve provided in this embodiment;

[0015] Figure 2 is an assembly schematic diagram of the sealing ring provided in this embodiment between the piston rod and the cylinder block;

[0016] Figure 3 is a sealing structure for the reversing valve of the coal mining machine hydraulic support in the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Combined with Figures 1 to 2 the static sealing ring of the hydraulic support reversing valve of the present invention will be further described.

[0018] A static sealing ring for a hydraulic support reversing valve, characterized in that: the sealing ring is an elastic sealing ring, and includes a base ring 1 with a central hole and a sealing ring 2 located on the outer side wall of the base ring 1.

[0019] The axial dimension of the sealing ring 2 is smaller than the axial dimension of the base ring 1, and the sealing ring 2 is located at the central position of the base ring 1, so that both ends of the sealing ring 2 are located inside both ends of the base ring 1. The cross-section of the base ring 1 is a rectangular structure, and a chamfered structure 3 is provided on the outer side walls at both ends of the base ring 1.

[0020] The cooperation of the base ring 1 and the sealing ring 2 can ensure the sealing performance between the piston rod 4 and the cylinder block 5. Specifically, the shape and structure of the base ring 1 can enable the entire sealing ring to be stably assembled in the sealing groove of the piston rod 4, that is, the inner side wall of the base ring 1 can completely fit with the bottom of the sealing groove on the piston rod 4 to ensure the stability of the base ring on the piston rod. After the chamfered structure 3 is provided at both ends of the base ring 1, the height of the end 11 of the base ring 1 is lower than the depth of the sealing groove, so that the end position of the base ring 1 corresponding to the gap between the piston rod 4 and the cylinder block 5 forms a retracted structure. At the same time, the axial length of the sealing ring 2 is smaller than the axial length of the base ring 1, so that both ends of the sealing ring 2 are retracted inside the two chamfered structures 3 of the base ring 1, providing a deformation space 6 for the sealing ring when the piston rod 4 and the cylinder block 5 move relative to each other and the sealing ring deforms. Thus, it effectively prevents the edge part of the end of the base ring 1 or the end of the sealing ring 2 from being squeezed into the gap between the piston rod 4 and the cylinder block 5 due to deformation, and improves the stability and service life of the entire sealing structure.

[0021] The outer side surface of the sealing ring 2 is an arc structure 21. Under this structure, when the sealing ring is under stable force, the sealing ring 2 deforms appropriately to seal the piston rod 4 and the cylinder block 5. When the force on the sealing ring is unstable or increases, the deformation amount of the sealing ring 2 increases. As the deformation amount increases, both the reverse extrusion force generated by the sealing ring 2 and the contact area with the inner wall of the cylinder block 5 will increase to achieve effective sealing performance. Secondly, the shape structure of the sealing ring 2 cooperates with the chamfered structures 3 on both sides of the base ring 1, making the entire sealing ring have the characteristic that the axial dimension gradually increases from the outside to the inside, so that the overall sealing performance and reverse extrusion force of the sealing ring can be gradually improved as the deformation amount increases.

[0022] The sealing ring is a pure polyurethane elastic sealing ring. Polyurethane has the characteristics of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, and elasticity. It can be effectively expanded to cooperate with mechanical equipment to complete the automatic installation function, and at the same time, it can also achieve the sealing function.

[0023] The sealing ring 2 and the base ring 1 are of an integrally injection-molded structure, which has the characteristics of stable structure and convenient production.

[0024] Unless otherwise clearly specified and limited, in the present invention, if there are terms such as "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or position relationship in the present invention are only used for exemplary illustration and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood by combining the drawings and according to specific circumstances.

[0025] Unless otherwise clearly specified and limited, in the present invention, if there are terms such as "set", "connected" and "connected", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A static seal ring for a hydraulic support reversing valve, characterized by: The sealing ring is an elastic sealing ring, and comprises a base ring and a sealing ring located on the outer side wall of the base ring; The cross section of the base ring is a quadrilateral structure, and chamfered structures are provided on the outer side walls at both ends of the base ring; The axial dimension of the sealing ring is smaller than the axial dimension of the base ring, and the sealing ring is located at the center of the base ring.

2. The static seal ring of the hydraulic support reversing valve according to claim 1 is characterized in that: The outer side surface of the sealing ring is an arc structure.

3. The static seal ring of the hydraulic support reversing valve according to claim 1 is characterized by: The sealing ring is a pure polyurethane elastic sealing ring.

4. The static seal ring of the hydraulic support reversing valve according to claim 1 is characterized by: The sealing ring and the base ring are an integral injection-molded structure.

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