Dual-purpose sealing ring for piston rod and piston

Abstract

The invention relates to the technical field of piston sealing, in particular to a piston rod and piston dual-purpose sealing ring which comprises a piston rod assembly, a sealing installation mechanism and two piston sealing rings, the sealing installation mechanism is installed on the outer side of the bottom end of the piston rod assembly, and the two piston sealing rings are installed on the outer side of the sealing installation mechanism. The piston rod assembly comprises a rod body, a spline ring is installed on the lower end face of the rod body, and a threaded sleeve is installed on the inner side of the spline ring. The sealing ring on the piston rod is actively pressurized, so that the contact degree of the sealing ring and the piston cylinder can be effectively improved, stable sealing of the piston is further kept, the pressure in the cylinder is conveniently monitored, and the sealing of the piston is conveniently detected; the problems that when an existing sealing ring is used for sealing a piston rod, the piston rod drives the sealing ring to do reciprocating motion, sealing deformation is easily caused, sealing fails, and the pressure in a piston cylinder is inconvenient to monitor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of piston sealing, in particular to a dual-purpose sealing ring for a piston rod and a piston. Background Art

[0002] The hydraulic cylinder and pneumatic cylinder of construction machinery work in harsh working conditions for a long time. Therefore, a dust ring is set outside the hydraulic cylinder to prevent external impurities, dust layers, moisture, etc. from entering the system to damage the hydraulic cylinder and the sealing system. A piston rod seal is also needed to play the main sealing role. The seal is to prevent the leakage of the working medium (internal leakage and external leakage) and prevent foreign objects from entering the hydraulic components and hydraulic systems. Although the seal is an auxiliary part of the hydraulic equipment, the quality of the seal and the sealing device is one of the keys that directly affects whether the hydraulic system can work normally. The quality of the seal has, to a certain extent, restricted the improvement of the performance and reliability of the hydraulic components and hydraulic systems, the length of service life, and the key to affecting the grade and level of hydraulic equipment and participating in international competition.

[0003] When the existing sealing ring seals the piston rod, the piston rod drives the sealing ring to move back and forth, which can easily cause the seal to be compressed and deformed, thereby causing the seal to fail, and it is not convenient to monitor the pressure in the piston cylinder; therefore, it does not meet the existing needs. We have proposed a dual-purpose sealing ring for the piston rod and the piston. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-purpose sealing ring for piston rod and piston, so as to solve the problem mentioned in the above background technology that when the existing sealing ring seals the piston rod, the piston rod drives the sealing ring to move back and forth, which easily causes the seal to be compressed and deformed, thereby causing the seal to fail, and it is inconvenient to monitor the pressure in the piston cylinder.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a piston rod and piston dual-purpose sealing ring, comprising a piston rod assembly, a sealing installation mechanism and two piston sealing rings, the outer side of the bottom end of the piston rod assembly is equipped with a sealing installation mechanism, the outer side of the sealing installation mechanism is equipped with two piston sealing rings, the piston rod assembly comprises a rod body, the lower end surface of the rod body is equipped with a spline ring, the inner side of the spline ring is equipped with a threaded sleeve, the inner side of the threaded sleeve is equipped with a pressure detection seat, and the lower end surface of the pressure detection seat is provided with a protective sheet;

[0006] The sealing installation mechanism comprises a sealing installation ring, a plurality of axial sliding grooves are arranged on the outer side of the middle part of the sealing installation ring, a positioning piece is arranged on the inner side of the axial sliding groove, an extrusion block is arranged in the middle part of the positioning piece, conical sliders are arranged on both sides of the extrusion block, two annular positioning grooves are arranged at both ends of the plurality of axial sliding grooves, and a movable pressing ring is arranged on the inner side of the annular positioning groove;

[0007] The piston sealing ring comprises an oil seal body, one side of which is provided with an elastic groove, and an oil seal skeleton and two elastic support wires are installed inside each of the oil seal bodies.

[0008] Preferably, the piston rod assembly also includes a connecting ring fixedly connected to the bottom end of the rod body, four anti-deflection strips are installed on the inner side of the connecting ring, a center positioning rod is installed on the upper end surface of the pressure detection seat, and a support sleeve is installed between the middle part of the center positioning rod and the rod body.

[0009] Preferably, the inner wall of the sealing mounting ring is provided with a plurality of slots, and the plurality of anti-deflection strips are inserted into the inner sides of the slots and welded and fixed to the connecting ring, the sealing mounting ring is sleeved on the outer side of the bottom end of the rod body, and the sealing mounting ring is fixedly connected to the bottom end of the rod body through the connecting ring and the plurality of anti-deflection strips.

[0010] Preferably, the lower end face of the rod body is provided with a spline groove, the spline ring is arranged on the inner side of the spline groove, the upper end of the threaded sleeve passes through the spline ring and is threadedly connected to the rod body, and the bottom end of the center positioning rod passes through the supporting sleeve and is inserted into the inner side of the threaded sleeve.

[0011] Preferably, the center positioning rod is connected to the rod body via a support sleeve, the center positioning rod and the support sleeve are connected via a flat key, a limiting ring is provided on the inner wall of the rod body, and the upper end surface of the support sleeve is in close contact with the limiting ring.

[0012] Preferably, the pressure detection seat is connected to the threaded sleeve via a protective sheet, a tapered hole is provided on the inner side of the bottom end of the threaded sleeve, and the protective sheet is arranged on the inner side of the tapered hole.

[0013] Preferably, the sealing mounting ring is formed by an integrated machine, the axial slide groove coincides with the axis of the sealing mounting ring, and a plurality of the axial slide grooves are arranged in a circle relative to the sealing mounting ring.

[0014] Preferably, the positioning plate and the extrusion block are integrally machined and fixed to the sealing mounting ring by screws, guide bevels are provided on both sides of the extrusion block and one end of two adjacent conical sliders, and the extrusion block contacts the two adjacent conical sliders through the guide bevels.

[0015] Preferably, two adjacent conical sliders are symmetrically installed relative to the extrusion block, and the two adjacent conical sliders slide in opposite directions along the axis of the sealing mounting ring on the inner side of the axial slide groove, and one side of the movable pressure ring is in close contact with the ends of multiple conical sliders.

[0016] Preferably, the side of the oil seal body away from the elastic groove is connected to the sealing mounting ring through a movable pressure ring, the oil seal body is covered on the outside of the elastic support wire and the oil seal skeleton, the oil seal skeleton is made of metal, and the elastic support wire is an annular spring.

[0017] The present invention can effectively maintain the stable contact between the tapered slider and the sealing mounting ring by fixing the positioning piece and the sealing mounting ring, and can adjust the installation gap between the positioning piece and the sealing mounting ring, thereby adjusting the depth of the extrusion block inserted into the axial slide groove. The extrusion block contacts the two adjacent tapered sliders through the guiding inclined surface, and then the extrusion block can squeeze the two adjacent tapered sliders through the guiding inclined surface, and then the two adjacent tapered sliders slide in opposite directions on the inner side of the axial slide groove and push the movable pressure ring, and the two movable pressure rings can synchronously axially squeeze the side of the oil seal body away from the elastic groove, thereby improving the contact tightness between the oil seal body and the piston cylinder body, and achieving the sealing effect when the piston is in motion.

[0018] The present invention can also provide annular support for the oil seal body through the oil seal skeleton to avoid radial deformation of the oil seal body, and can elastically support the oil seal body through two elastic support wires, so as to facilitate the oil seal body to automatically reset after being compressed, and avoid the situation where the seal fails due to deformation. The pressure detection seat can monitor the internal pressure of the piston cylinder in real time during the action of the piston rod assembly through the protective sheet. The center positioning rod is connected to the rod body by a supporting sleeve, so that the threaded sleeve and the pressure detection seat can be effectively supported by the center positioning rod and the supporting sleeve to avoid sliding of the threaded sleeve and the pressure detection seat relative to the rod body under pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a partial structural schematic diagram of the present invention as a whole;

[0021] Figure 3 It is a partial cross-sectional structural schematic diagram of the piston rod assembly of the present invention;

[0022] Figure 4 Schematic diagram of the cross-sectional structure of the anti-deflection strip of the present invention;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the piston sealing ring of the present invention;

[0024] Figure 6 It is a schematic cross-sectional structure diagram of the sealing installation mechanism of the present invention;

[0025] Figure 7 It is a schematic diagram of the explosion structure of the sealing installation mechanism of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] See also Figures 1 to 4 The present invention provides a dual-purpose sealing ring for a piston rod and a piston, comprising a piston rod assembly 1, a sealing installation mechanism 2 and two piston sealing rings 3. The piston rod assembly 1 comprises a rod body 101, a spline ring 102 is installed on the lower end surface of the rod body 101, a threaded sleeve 103 is installed on the inner side of the spline ring 102, a spline groove is provided on the lower end surface of the rod body 101, the spline ring 102 is arranged on the inner side of the spline groove, the upper end of the threaded sleeve 103 passes through the spline ring 102 and is connected to the rod body 101 by threads, and the threaded sleeve A pressure detection seat 107 is installed on the inner side of 103, and a protective sheet 104 is provided on the lower end surface of the pressure detection seat 107. The pressure detection seat 107 is connected to the threaded sleeve 103 through the protective sheet 104. A tapered hole is provided on the inner side of the bottom end of the threaded sleeve 103, and the protective sheet 104 is arranged on the inner side of the tapered hole, so that the pressure detection seat 107 can monitor the internal pressure of the piston cylinder in real time during the movement of the piston rod assembly 1 through the protective sheet 104, and then can detect whether the piston seal fails;

[0028] A connecting ring 105 is installed on the outer side of the bottom end of the rod body 101, and four anti-deflection strips 106 are installed on the inner side of the connecting ring 105. A center positioning rod 108 is installed on the upper end surface of the pressure detection seat 107, and a support sleeve 109 is installed between the middle part of the center positioning rod 108 and the rod body 101. The bottom end of the center positioning rod 108 passes through the support sleeve 109 and is plugged into the inner side of the threaded sleeve 103. The center positioning rod 108 is connected to the rod body 101 through the support sleeve 109, and the center positioning rod 108 and the support sleeve 109 are connected through a flat key. A limiting ring is provided on the inner wall of the rod body 101, and the upper end surface of the support sleeve 109 is in contact with the limiting ring. The center positioning rod 108 and the support sleeve 109 can effectively support the threaded sleeve 103 and the pressure detection seat 107 to prevent the threaded sleeve 103 and the pressure detection seat 107 from sliding relative to the rod body 101 under pressure.

[0029] See also Figures 2 to 7A sealing installation mechanism 2 is installed on the outer side of the bottom end of the piston rod assembly 1, and the sealing installation mechanism 2 includes a sealing installation ring 201. The inner wall of the sealing installation ring 201 is provided with a plurality of slots, and a plurality of anti-deflection strips 106 are inserted into the inner side of the slots and welded and fixed with the connecting ring 105. The sealing installation ring 201 is sleeved on the outer side of the bottom end of the rod body 101, and the sealing installation ring 201 is fixedly connected to the bottom end of the rod body 101 through the connecting ring 105 and a plurality of anti-deflection strips 106. The anti-deflection strips 106 can effectively prevent the sealing installation ring 201 from axially deflecting relative to the rod body 101.

[0030] Furthermore, a plurality of axial grooves 207 are provided on the outer side of the middle part of the sealing mounting ring 201, and the sealing mounting ring 201 is formed by an integrated machine. The axial grooves 207 coincide with the axis of the sealing mounting ring 201, and the plurality of axial grooves 207 are arranged in a circle relative to the sealing mounting ring 201. A positioning piece 203 is installed on the inner side of the axial groove 207, and an extrusion block 205 is provided in the middle part of the positioning piece 203. Conical sliders 204 are installed on both sides of the extrusion block 205, and the positioning piece 203 and the extrusion block 205 are formed by an integrated machine. The positioning piece 203 is fixed to the sealing mounting ring 201 by screws, and both sides of the extrusion block 205 and one end of the two adjacent conical sliders 204 are provided with guiding inclined surfaces. The extrusion block 205 contacts the two adjacent conical sliders 204 through the guiding inclined surfaces. By adjusting the installation gap between the positioning piece 203 and the sealing mounting ring 201, the depth of the extrusion block 205 inserted into the axial slide groove 207 can be adjusted, and the extrusion block 205 can extrude the two adjacent conical sliders 204 through the guiding inclined surfaces.

[0031] Two annular positioning grooves 206 are provided at both ends of the multiple axial sliding grooves 207, and a movable pressure ring 202 is installed on the inner side of the annular positioning groove 206. The two adjacent conical sliders 204 are symmetrically installed relative to the extrusion block 205. The two adjacent conical sliders 204 slide in opposite directions along the axis of the sealing mounting ring 201 on the inner side of the axial sliding groove 207. One side of the movable pressure ring 202 is in contact with the end of the multiple conical sliders 204. The two adjacent conical sliders 204 push the movable pressure ring 202, so that the two movable pressure rings 202 can synchronously axially squeeze the side of the oil seal body 301 away from the elastic groove 304, thereby improving the contact tightness between the oil seal body 301 and the piston cylinder.

[0032] See also Figure 5 and Figure 6Two piston sealing rings 3 are installed on the outer side of the sealing installation mechanism 2. The piston sealing ring 3 includes an oil seal body 301. An elastic groove 304 is provided on one side of the oil seal body 301. An oil seal skeleton 303 and two elastic support wires 302 are installed inside each oil seal body 301. The side of the oil seal body 301 away from the elastic groove 304 is connected to the sealing installation ring 201 through a movable pressure ring 202. The oil seal body 301 is covered on the outer side of the elastic support wire 302 and the oil seal skeleton 303. The material of the oil seal skeleton 303 is metal. The elastic support wire 302 is an annular spring. The oil seal skeleton 303 can provide annular support for the oil seal body 301 to avoid radial deformation of the oil seal body 301. The two elastic support wires 302 can provide elastic support for the oil seal body 301, so that the oil seal body 301 can automatically reset after being compressed to avoid sealing failure caused by deformation.

[0033] When in use, the sealing installation ring 201 is sleeved on the outer side of the bottom end of the rod body 101, so that the connecting ring 105 drives the multiple anti-deflection strips 106 to be inserted into the inner side of the rod body 101 and the sealing installation ring 201, and then the sealing installation ring 201 is kept stable when the connecting ring 105 and the rod body 101 are fixedly connected by screws. The anti-deflection strips 106 can effectively prevent the sealing installation ring 201 from axially deflecting relative to the rod body 101, and the two movable pressing rings 202 are placed on the inner side of the annular positioning groove 206, so that the extrusion block 205 and the conical slider 204 are installed between the two movable pressing rings 202. By fixing the positioning piece 203 and the sealing installation ring 201, the stable contact between the conical slider 204 and the sealing installation ring 201 can be effectively maintained. At this time, the two oil seal bodies 301 are placed between the movable pressing ring 202 and the sealing installation ring 201;

[0034] When the whole is used, the installation gap between the positioning piece 203 and the sealing installation ring 201 is adjusted, so that the depth of the extrusion block 205 inserted into the axial slide groove 207 can be adjusted. Guide slopes are provided on both sides of the extrusion block 205 and the ends facing the two adjacent conical sliders 204. The extrusion block 205 contacts the two adjacent conical sliders 204 through the guide slopes, so that the extrusion block 205 can squeeze the two adjacent conical sliders 204 through the guide slopes, and then the two adjacent conical sliders 204 slide in opposite directions on the inner side of the axial slide groove 207 and push the movable pressure ring 202. The two movable pressure rings 202 can synchronously axially squeeze the side of the oil seal body 301 away from the elastic groove 304, so as to improve the contact tightness between the oil seal body 301 and the piston cylinder body, and achieve the sealing effect when the piston is in motion;

[0035] An oil seal skeleton 303 and two elastic support wires 302 are installed inside the oil seal body 301, so that the oil seal skeleton 303 can provide annular support for the oil seal body 301 to prevent the oil seal body 301 from radial deformation, and the two elastic support wires 302 can provide elastic support for the oil seal body 301, so that the oil seal body 301 can automatically reset after being compressed to prevent deformation from causing sealing failure. A threaded sleeve 103 is connected to the inner side of the bottom end of the rod body 101 through a thread, and the spline ring 102 is fixedly connected to the rod body 101 through the threaded sleeve 103, so that the spline ring 102 positions the threaded sleeve 103, and a tapered hole is provided on the inner side of the bottom end of the threaded sleeve 103, so that the protective sheet 104 can be effectively prevented from falling off through the tapered hole;

[0036] A pressure detection seat 107 is provided between the protective sheet 104 and the center positioning rod 108, so that the pressure detection seat 107 can monitor the internal pressure of the piston cylinder in real time during the movement of the piston rod assembly 1 through the protective sheet 104, and the center positioning rod 108 is connected to the rod body 101 through a support sleeve 109, so that the threaded sleeve 103 and the pressure detection seat 107 can be effectively supported by the center positioning rod 108 and the support sleeve 109, so as to prevent the threaded sleeve 103 and the pressure detection seat 107 from sliding relative to the rod body 101 under pressure.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A dual-purpose sealing ring for a piston rod and a piston, comprising a piston rod assembly, a sealing mounting mechanism and two piston sealing rings, characterized in that: A sealing installation mechanism is installed on the outer side of the bottom end of the piston rod assembly, and two piston sealing rings are installed on the outer side of the sealing installation mechanism. The piston rod assembly includes a rod body, a spline ring is installed on the lower end surface of the rod body, a threaded sleeve is installed on the inner side of the spline ring, a pressure detection seat is installed on the inner side of the threaded sleeve, and a protective sheet is provided on the lower end surface of the pressure detection seat; The sealing installation mechanism comprises a sealing installation ring, a plurality of axial sliding grooves are arranged on the outer side of the middle part of the sealing installation ring, a positioning piece is arranged on the inner side of the axial sliding groove, an extrusion block is arranged in the middle part of the positioning piece, conical sliders are arranged on both sides of the extrusion block, two annular positioning grooves are arranged at both ends of the plurality of axial sliding grooves, and a movable pressing ring is arranged on the inner side of the annular positioning groove; The piston sealing ring comprises an oil seal body, one side of which is provided with an elastic groove, and an oil seal skeleton and two elastic support wires are installed inside each of the oil seal bodies.

2. A dual-purpose sealing ring for piston rod and piston according to claim 1, characterized in that: The piston rod assembly also includes a connecting ring fixedly connected to the bottom end of the rod body, four anti-deflection strips are installed on the inner side of the connecting ring, a center positioning rod is installed on the upper end surface of the pressure detection seat, and a supporting sleeve is installed between the middle part of the center positioning rod and the rod body.

3. A dual-purpose sealing ring for piston rod and piston according to claim 2, characterized in that: The inner wall of the sealing mounting ring is provided with a plurality of slots, and the plurality of anti-deflection strips are inserted into the inner sides of the slots and welded and fixed with the connecting ring. The sealing mounting ring is sleeved on the outer side of the bottom end of the rod body, and the sealing mounting ring is fixedly connected to the bottom end of the rod body through the connecting ring and the plurality of anti-deflection strips.

4. A dual-purpose sealing ring for piston rod and piston according to claim 2, characterized in that: The lower end surface of the rod body is provided with a spline groove, the spline ring is arranged on the inner side of the spline groove, the upper end of the threaded sleeve passes through the spline ring and is connected to the rod body by threads, and the bottom end of the center positioning rod passes through the supporting sleeve and is inserted into the inner side of the threaded sleeve.

5. A dual-purpose sealing ring for piston rod and piston according to claim 3, characterized in that: The center positioning rod is connected to the rod body through a supporting sleeve, and the center positioning rod is connected to the supporting sleeve through a flat key. A limiting ring is provided on the inner wall of the rod body, and the upper end surface of the supporting sleeve is in close contact with the limiting ring.

6. A dual-purpose sealing ring for piston rod and piston according to claim 5, characterized in that: The pressure detection seat is connected to the threaded sleeve via a protective sheet. A conical hole is provided on the inner side of the bottom end of the threaded sleeve, and the protective sheet is arranged on the inner side of the conical hole.

7. A dual-purpose sealing ring for piston rod and piston according to claim 1, characterized in that: The sealing installation ring is formed by an integrated machine, the axial sliding groove coincides with the axis of the sealing installation ring, and a plurality of the axial sliding grooves are arranged in a circle relative to the sealing installation ring.

8. A dual-purpose sealing ring for piston rod and piston according to claim 7, characterized in that: The positioning piece and the extrusion block are machined as one piece, the positioning piece is fixed to the sealing mounting ring by screws, both sides of the extrusion block and one end of two adjacent conical sliders are provided with guiding inclined surfaces, and the extrusion block contacts the two adjacent conical sliders through the guiding inclined surfaces.

9. A dual-purpose sealing ring for piston rod and piston according to claim 8, characterized in that: The two adjacent conical sliders are symmetrically installed relative to the extrusion block, and the two adjacent conical sliders slide in opposite directions along the axis of the sealing mounting ring on the inner side of the axial slide groove, and one side of the movable pressure ring is in close contact with the ends of multiple conical sliders.

10. A dual-purpose sealing ring for piston rod and piston according to claim 9, characterized in that: The side of the oil seal body away from the elastic groove is connected to the sealing mounting ring through a movable pressure ring. The oil seal body is covered on the outside of the elastic support wire and the oil seal skeleton. The material of the oil seal skeleton is metal, and the elastic support wire is an annular spring.

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