Hydraulic oil cylinder sealing device

Abstract

The utility model relates to the field of hydraulic oil cylinders, and discloses a hydraulic oil cylinder sealing device which comprises a cylinder body, a cylinder seat, a cylinder cover, a piston, a piston rod, a first sealing ring, a piston ring, a second sealing ring, a sealing assembly and a cooling assembly. The piston is slidably installed in the cylinder body, one end of the piston rod is fixedly connected with the right side wall of the piston, a through hole is formed in the center of the cylinder cover, the right end of the piston rod slidably penetrates through the through hole, the sealing assembly is arranged between the through hole and the piston rod, and the cooling assembly is arranged on the cylinder cover. The utility model has the following advantages and effects: the dustproof ring and the two third sealing rings mounted on the cylinder cover can be effectively subjected to heat conduction, heat dissipation and cooling, the sealing performance of the dustproof ring and the two third sealing rings can be improved, and the service life of the dustproof ring and the two third sealing rings can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to a hydraulic oil cylinder sealing device. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The hydraulic cylinder sealing device is one of the necessary parts of the hydraulic cylinder. The traditional hydraulic cylinder sealing device is prone to internal leakage and cannot be used for high-pressure oil transmission. In addition, the sealing ring is difficult to install. After severe deformation, it is difficult to ensure the integrity of the sealing ring, which easily causes unreliable sealing; the assembly efficiency is low and the labor intensity is high.

[0003] In response to the above problem, a hydraulic cylinder sealing device is disclosed in the Chinese patent announcement with announcement number CN206889386U, including: a cylinder body, a base, a guide sleeve and a cylinder head; both sides of the cylinder body extend outward to form a flange, the flange and the base are connected by screws, the base is partially located in the cylinder body, a first sealing ring and a second sealing ring are provided on the base, the first sealing ring is located between the base and the cylinder body, and the second sealing ring is located between the base and the flange; a third sealing ring, a fourth sealing ring and an O-ring are provided on the guide sleeve, the third sealing ring is located between the guide sleeve and the piston rod, the fourth sealing ring is located between the guide sleeve and the cylinder head, and the O-ring is located between the guide sleeve and the cylinder body; the cylinder head, the guide sleeve and the flange are connected by screws, a dust ring is provided on the side of the cylinder head away from the guide sleeve, and the dust ring is located between the cylinder head and the piston rod.

[0004] Although the hydraulic cylinder sealing device of the above scheme has the advantages of good sealing performance and preventing the occurrence of hydraulic cylinder leakage, it is found in actual use that there are still at least the following shortcomings: during the reciprocating telescopic motion of the piston rod, due to the relative sliding between the piston rod and the cylinder cover, the dust ring and the sealing ring installed on the cylinder cover will also have relative sliding friction with the telescopic rod to generate heat. Once the heat of the dust ring and the sealing ring installed on the cylinder cover cannot be dissipated in time, the temperature will become higher and higher, thereby reducing the performance and service life of the dust ring and the sealing ring.

[0005] Therefore, it is necessary to design a hydraulic cylinder sealing device that can effectively dissipate heat and cool the dust ring and sealing ring installed on the cylinder head to improve their performance and service life. Utility Model Content

[0006] The utility model aims to provide a hydraulic cylinder sealing device, which can achieve the purpose of effective heat conduction, heat dissipation and cooling of the dust ring and two third sealing rings installed on the cylinder cover, thereby improving the sealing performance and service life of the dust ring and the two third sealing rings.

[0007] The above technical objectives of the utility model are achieved through the following technical solutions: a hydraulic cylinder sealing device, including a cylinder body, a cylinder seat, a cylinder head, a piston, a piston rod, a first sealing ring, a piston ring, a second sealing ring, a sealing assembly and a cooling assembly, the cylinder seat is detachably fixedly installed on the left end of the cylinder body, the cylinder head is detachably fixedly installed on the right end of the cylinder body, the piston is slidably installed in the cylinder body, one end of the piston rod is fixedly connected to the right side wall of the piston, a through hole is opened in the center of the cylinder head, the right end of the piston rod slides through the through hole, the sealing assembly is arranged between the through hole and the piston rod, and the cooling assembly is arranged on the cylinder head.

[0008] The utility model is further configured as follows: the first sealing ring is embedded on the cylinder seat, the piston ring is embedded on the piston, the second sealing ring is embedded on the cylinder cover, and the first sealing ring, the piston ring and the second sealing ring are all in sealing contact with the inner wall of the cylinder body.

[0009] The utility model is further configured as follows: the sealing assembly includes a dust ring and two third sealing rings, the dust ring and the two third sealing rings are both mounted on the inner wall of the through hole, and the dust ring and the two third sealing rings are both in sliding sealing contact with the piston rod.

[0010] The utility model is further configured as follows: the cooling component includes heat-conducting oil, multiple first heat-conducting rods, multiple second heat-conducting rods, multiple third heat-conducting rods and annular heat sinks; an annular oil storage chamber is opened in the cylinder head; the heat-conducting oil is stored in the annular oil storage chamber; multiple first heat-conducting rods and multiple second heat-conducting rods are fixedly mounted on the inner circular wall of the annular oil storage chamber and are arranged in an annular pattern with equal spacing; one end of multiple first heat-conducting rods extends outside the annular oil storage chamber and contacts the third sealing ring; one end of multiple second heat-conducting rods extends outside the annular oil storage chamber and contacts the dustproof ring; multiple third heat-conducting rods are fixedly mounted on the right inner wall of the annular oil storage chamber and are arranged in an annular pattern with equal spacing; the annular heat sink is fixedly mounted on the right side wall of the cylinder head; the right end of the piston rod passes through the inner ring of the annular heat sink; the right ends of multiple third heat-conducting rods are fixedly connected to the annular heat sink.

[0011] The utility model is further configured as follows: an oil changing hole is opened on the right inner wall of the annular oil storage cavity, and a sealing cock is installed on the inner thread of the oil changing hole.

[0012] The utility model is further configured as follows: the cylinder seat is fixedly connected to the left end of the cylinder body by screws, and the cylinder cover is fixedly connected to the right end of the cylinder body by screws.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model can seal the gap between the cylinder body and the cylinder seat by using the first sealing ring, and can seal the gap between the cylinder head and the cylinder seat by using the second sealing ring, wherein the first sealing ring and the second sealing ring are both in a static sealing state, which can effectively prevent the hydraulic oil inside the cylinder body from leaking out from the connection between the cylinder body and the cylinder seat and the connection between the cylinder body and the cylinder head, and can seal the gap between the cylinder head and the piston rod by using the dustproof ring and the two third sealing rings, and can prevent dust from entering the cylinder body by using the dustproof ring, which can extend the service life of the hydraulic cylinder, wherein the dustproof ring and the two third sealing rings are both in a dynamic sealing state, which can effectively prevent the hydraulic oil inside the cylinder body from leaking out from between the cylinder head and the piston rod, thereby ensuring good sealing characteristics when the hydraulic cylinder is in use.

[0015] 2. The utility model utilizes a cooling assembly composed of heat-conducting oil, multiple first heat-conducting rods, multiple second heat-conducting rods, multiple third heat-conducting rods and annular heat sinks to achieve the purpose of effective heat conduction, heat dissipation and cooling of the dustproof ring and the two third sealing rings, and can improve the sealing performance and service life of the dustproof ring and the two third sealing rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0018] Figure 2 It is a schematic diagram of the main cross-sectional structure of this embodiment.

[0019] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0020] In the figure, 1. cylinder body; 2. cylinder seat; 3. cylinder head; 4. piston; 5. piston rod; 6. first sealing ring; 7. piston ring; 8. second sealing ring; 9. dust ring; 10. third sealing ring; 11. annular oil storage chamber; 12. heat-conducting oil; 13. first heat-conducting rod; 14. second heat-conducting rod; 15. third heat-conducting rod; 16. annular heat sink; 17. oil change hole; 18. sealing plug. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , Figure 2 and Figure 3 The utility model provides a hydraulic cylinder sealing device, including a cylinder body 1, a cylinder seat 2, a cylinder head 3, a piston 4, a piston rod 5, a first sealing ring 6, a piston ring 7, a second sealing ring 8, a sealing assembly and a cooling assembly, wherein:

[0023] The cylinder seat 2 is detachably fixedly installed on the left end of the cylinder body 1, the cylinder head 3 is detachably fixedly installed on the right end of the cylinder body 1, the piston 4 is slidably installed in the cylinder body 1, the cylinder seat 2 is fixedly connected to the left end of the cylinder body 1 by screws, and the cylinder head 3 is fixedly connected to the right end of the cylinder body 1 by screws, thereby facilitating the disassembly and assembly between the cylinder body 1, the cylinder seat 2 and the cylinder head 3, so as to facilitate the inspection and maintenance of the parts inside the cylinder body 1, the first sealing ring 6 is mounted on the cylinder seat 2, the piston ring 7 is mounted on the piston 4, and the second sealing ring 8 is mounted on the cylinder head 3. The first sealing ring 6, the piston ring 7 and the second sealing ring 8 are all in sealing contact with the inner wall of the cylinder body 1, the first sealing ring 6 is used to seal the gap between the cylinder body 1 and the cylinder seat 2, and the piston ring 7 is used to seal the gap between the piston and the cylinder seat 2 The gap is sealed, and the second sealing ring 8 is used to seal the gap between the cylinder head 3 and the cylinder base 2, wherein the first sealing ring 6 and the second sealing ring 8 are both in a static sealing state and are not easily damaged by wear. It should be noted that the number of the first sealing ring 6, the piston ring 7 and the second sealing ring 8 is at least two, one end of the piston rod 5 is fixedly connected to the right side wall of the piston 4, a through hole is opened in the central part of the cylinder head 3, and the right end of the piston rod 5 slides through the through hole, and the sealing component is arranged between the through hole and the piston rod 5. The sealing component is used to seal the gap between the cylinder head 3 and the piston rod 5. The above-mentioned sealing component includes a dust ring 9 and two third sealing rings 10, which are all mounted on the inner wall of the through hole. 9 and the two third sealing rings 10 are in sliding sealing contact with the piston rod 5. The dust ring 9 is used to prevent dust from entering the cylinder body 1, which can extend the service life of the hydraulic cylinder. The dust ring 9 and the two third sealing rings 10 can be used to seal the gap between the cylinder head 3 and the piston rod 5, wherein the dust ring 9 and the two third sealing rings 10 are in a dynamic sealing state. The cooling component is arranged on the cylinder head 3, and the cooling component is used to dissipate heat and cool the dust ring 9 and the two third sealing rings 10. The above-mentioned cooling component includes heat-conducting oil 12, multiple first heat-conducting rods 13, multiple second heat-conducting rods 14, multiple third heat-conducting rods 15 and annular heat sinks 16. An annular oil storage chamber 11 is opened in the cylinder head 3, and the heat-conducting oil 12 is stored in the annular oil storage chamber 11. The annular oil storage chamber 11 provides storage space for the heat transfer oil 12. A plurality of first heat transfer rods 13 and a plurality of second heat transfer rods 14 are fixedly mounted on the inner wall of the annular oil storage chamber 11 and are arranged in an annular pattern with equal spacing. One end of each of the first heat transfer rods 13 extends outside the annular oil storage chamber 11 and contacts the third sealing ring 10. One end of each of the second heat transfer rods 14 extends outside the annular oil storage chamber 11 and contacts the dust ring 9. A plurality of third heat transfer rods 15 are fixedly mounted on the right inner wall of the annular oil storage chamber 11 and are arranged in an annular pattern with equal spacing. An annular heat sink 16 is fixedly mounted on the right side wall of the cylinder head 3. The right end of the piston rod 5 passes through the inner ring of the annular heat sink 16. The right ends of the plurality of third heat transfer rods 15 are fixedly connected to the annular heat sink 16.By utilizing the heat conduction characteristics of the heat-conducting oil 12, the multiple first heat-conducting rods 13, the multiple second heat-conducting rods 14, the multiple third heat-conducting rods 15 and the annular heat sink 16, the heat generated by the relative sliding friction between the dust ring 9 and the two third sealing rings 10 and the piston rod 5 can be transferred to the outside air, so as to achieve the purpose of effective heat conduction, heat dissipation and cooling of the dust ring 9 and the two third sealing rings 10, and improve the sealing performance and service life of the dust ring 9 and the two third sealing rings 10. It should be noted that the multiple first heat-conducting rods 13, the multiple second heat-conducting rods 14, the multiple third heat-conducting rods 15 and the annular heat sink 16 can be made of aluminum alloy or copper alloy materials with good thermal conductivity.

[0024] In this embodiment, an oil change hole 17 is opened on the right inner wall of the annular oil storage chamber 11, and a sealing plug 18 is installed on the inner thread of the oil change hole 17. The oil change hole 17 is provided to facilitate the replacement of the heat transfer oil 12, and the sealing plug 18 is used to seal the oil change hole 17.

[0025] Through the above structure, the hydraulic cylinder sealing device provided by the utility model can effectively conduct heat to dissipate heat and cool the dust ring 9 and the two third sealing rings 10 installed on the cylinder head 3 when in use, and can improve the sealing performance and service life of the dust ring 9 and the two third sealing rings 10. When in use, the gap between the cylinder body 1 and the cylinder seat 2 can be sealed by using the first sealing ring 6, and the gap between the cylinder head 3 and the cylinder seat 2 can be sealed by using the second sealing ring 8, wherein the first sealing ring 6 and the second sealing ring 8 are both in a static sealing state, which can effectively prevent the hydraulic oil inside the cylinder body 1 from leaking from the connection between the cylinder body 1 and the cylinder seat 2 and the connection between the cylinder body 1 and the cylinder head 3, and the gap between the cylinder head 3 and the piston rod 5 can be sealed by using the dust ring 9 and the two third sealing rings 10, and the dust ring 9 can prevent dust from entering the cylinder body 1, thereby extending the service life of the hydraulic cylinder, wherein, The dust ring 9 and the two third sealing rings 10 are both in a dynamic sealing state, which can effectively prevent the hydraulic oil inside the cylinder body 1 from leaking out from between the cylinder head 3 and the piston rod 5, thereby ensuring good sealing characteristics when the hydraulic cylinder is in use. When the piston 4 drives the piston rod 5 to perform horizontal reciprocating motion, the piston rod 5 will have relative sliding friction with the dust ring 9 and the two third sealing rings 10 to generate heat. At this time, the heat on the dust ring 9 and the two third sealing rings 10 can be transferred to the heat conducting oil 12 through multiple first heat conducting rods 13 and multiple second heat conducting rods 14, and then the heat is transferred to the annular heat sink 16 through the heat conducting oil 12 and multiple third heat conducting rods 15. Finally, the heat is transferred to the air of the external environment through the annular heat sink 16, which can achieve the purpose of effective heat conduction, heat dissipation and cooling of the dust ring 9 and the two third sealing rings 10, and can improve the sealing performance and service life of the dust ring 9 and the two third sealing rings 10.

[0026] The above is a detailed introduction to the hydraulic cylinder sealing device provided by the utility model. This article uses specific embodiments to explain the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. Hydraulic cylinder sealing device, characterized in that: The invention comprises a cylinder body (1), a cylinder seat (2), a cylinder head (3), a piston (4), a piston rod (5), a first sealing ring (6), a piston ring (7), a second sealing ring (8), a sealing assembly and a cooling assembly. The cylinder seat (2) is detachably fixedly mounted on the left end of the cylinder body (1), the cylinder head (3) is detachably fixedly mounted on the right end of the cylinder body (1), the piston (4) is slidably mounted in the cylinder body (1), one end of the piston rod (5) is fixedly connected to the right side wall of the piston (4), a through hole is opened in the center of the cylinder head (3), the right end of the piston rod (5) slides through the through hole, the sealing assembly is arranged between the through hole and the piston rod (5), and the cooling assembly is arranged on the cylinder head (3).

2. The hydraulic cylinder sealing device according to claim 1, characterized in that: The first sealing ring (6) is mounted on the cylinder seat (2), the piston ring (7) is mounted on the piston (4), and the second sealing ring (8) is mounted on the cylinder head (3). The first sealing ring (6), the piston ring (7) and the second sealing ring (8) are all in sealing contact with the inner wall of the cylinder body (1).

3. The hydraulic cylinder sealing device according to claim 1, characterized in that: The sealing assembly comprises a dust ring (9) and two third sealing rings (10); the dust ring (9) and the two third sealing rings (10) are both mounted on the inner wall of the through hole; the dust ring (9) and the two third sealing rings (10) are both in sliding sealing contact with the piston rod (5).

4. The hydraulic cylinder sealing device according to claim 3, characterized in that: The cooling assembly comprises heat-conducting oil (12), a plurality of first heat-conducting rods (13), a plurality of second heat-conducting rods (14), a plurality of third heat-conducting rods (15) and an annular heat sink (16); an annular oil storage chamber (11) is provided in the cylinder head (3); the heat-conducting oil (12) is stored in the annular oil storage chamber (11); the plurality of first heat-conducting rods (13) and the plurality of second heat-conducting rods (14) are fixedly mounted on the inner circular wall of the annular oil storage chamber (11) and are arranged in an annular manner with equal spacing; one end of the plurality of first heat-conducting rods (13) extends to the annular oil storage chamber (11); ) outside the annular oil storage chamber (11) and in contact with the third sealing ring (10), one end of each of the plurality of second heat-conducting rods (14) extends outside the annular oil storage chamber (11) and in contact with the dust ring (9), each of the plurality of third heat-conducting rods (15) is fixedly mounted on the right inner wall of the annular oil storage chamber (11) and is arranged in an annular pattern with equal spacing, the annular heat sink (16) is fixedly mounted on the right wall of the cylinder head (3), the right end of the piston rod (5) passes through the inner ring of the annular heat sink (16), and the right ends of each of the plurality of third heat-conducting rods (15) are fixedly connected to the annular heat sink (16).

5. The hydraulic cylinder sealing device according to claim 4, characterized in that: An oil exchange hole (17) is provided on the right inner wall of the annular oil storage chamber (11), and a sealing cock (18) is installed in the inner thread of the oil exchange hole (17).

6. The hydraulic cylinder sealing device according to claim 1, characterized in that: The cylinder seat (2) is fixedly connected to the left end of the cylinder body (1) by means of screws, and the cylinder cover (3) is fixedly connected to the right end of the cylinder body (1) by means of screws.

Images