Sealing element for hydraulic cylinder

Abstract

The sealing element comprises a sealing ring arranged between a cylinder cover and a piston rod of the hydraulic cylinder, and the cylinder cover and the piston rod are arranged on the inner side and the outer side of the sealing ring in an attached mode respectively. The sealing ring is of a cavity structure, and a cavity in the sealing ring extends in the circumferential direction of the sealing ring. The sealing ring expands and deforms towards the two sides under the influence of pressure in the hydraulic cylinder, force in the axial direction of the piston rod is converted into force facing the cylinder cover and the piston rod, and therefore the cylinder cover, the sealing ring and the piston rod are sequentially and tightly contacted, media are prevented from leaking through gaps among the cylinder cover, the sealing ring and the piston rod, and the hydraulic cylinder is simple, efficient, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic equipment technology, and in particular to a seal for hydraulic cylinders. Background Technology

[0002] A hydraulic cylinder, also known as an oil cylinder, is an actuator in a hydraulic system. It converts hydraulic energy into mechanical energy and drives a working mechanism to perform linear reciprocating motion (or oscillating motion). A hydraulic cylinder mainly consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a buffer device, and an venting device. There is a certain assembly clearance between the assembled cylinder head and piston rod. Since the hydraulic cylinder transmits power through the movement of the high-pressure medium inside the cylinder barrel, a sealing device is generally installed between the cylinder head and piston rod to prevent leakage of the high-pressure medium.

[0003] Existing sealing devices experience wear during the long-term reciprocating sliding of the piston rod, leading to gradual gaps between the cylinder head, sealing device, and piston rod. During the reciprocating motion of the piston rod, some high-pressure medium is carried out, causing leakage and severely affecting the sealing effect. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a novel sealing component for hydraulic cylinders. This component utilizes the expansion and deformation of the sealing ring to both sides under the pressure within the hydraulic cylinder. This transforms the axial force along the piston rod into a force directed towards the cylinder head and piston rod, ensuring a tight contact between the cylinder head, sealing ring, and piston rod. This prevents leakage of the medium through the gaps between the cylinder head, sealing ring, and piston rod. The result is a simple, efficient, safe, reliable, and easy-to-operate sealing component for hydraulic cylinders.

[0005] This utility model is achieved through the following technical solution: a sealing component for a hydraulic cylinder is provided, including a sealing ring disposed between the cylinder head and the piston rod of the hydraulic cylinder, with the cylinder head and piston rod respectively fitted to the inner and outer sides of the sealing ring; the sealing ring has a hollow structure, and the cavity inside the sealing ring extends circumferentially along the sealing ring; by the sealing ring expanding and deforming to both sides under the influence of the pressure inside the hydraulic cylinder, the force along the piston rod axis is converted into a force toward the cylinder head and piston rod, thereby making the cylinder head, sealing ring and piston rod in close contact in sequence, preventing the medium from leaking through the gap between the cylinder head, sealing ring and piston rod.

[0006] As an optimization, the sealing rings are arranged sequentially along the piston rod axis, and adjacent sealing rings are fitted together; by the sealing rings arranged sequentially along the piston rod axis, pressure is transmitted to each other and the cylinder head and piston rod are sealed in multiple layers, reducing the possibility of media leakage.

[0007] As an optimization, the sealing ring is provided with matching anti-slip textures A and B on both sides of the piston rod axial direction. Anti-slip textures A and B extend along the circumference of the sealing ring; this ensures that the pressure is transmitted evenly between the sealing rings and prevents gaps from forming between the sealing rings and the hydraulic cylinder due to uneven force.

[0008] As an optimization, the sealing ring has matching anti-slip patterns A and B on both sides of the piston rod axial direction, and the anti-slip patterns A and B are interlocked; the interlocking anti-slip patterns A and B prevent relative sliding between adjacent sealing rings and prevent the sealing rings from being sleeved on each other under pressure, thereby preventing gaps from being generated between the cylinder head, sealing ring and piston rod during the sleeve process.

[0009] As an optimization, anti-slip textures A and B extend circumferentially along the sealing ring; ensuring uniform pressure transmission between the sealing rings and preventing gaps from forming between the sealing rings and the hydraulic cylinder due to uneven force distribution.

[0010] As an optimization, several sealing rings extending circumferentially along the sealing ring (3) and arranged sequentially along the piston rod axis are provided on the inner and outer sides of the sealing ring; the cylinder head and piston rod are respectively tightly connected by the sealing rings in sections to reduce the possibility of high pressure medium leakage.

[0011] The beneficial effects of this invention are as follows: The sealing ring expands and deforms to both sides under the influence of pressure within the hydraulic cylinder, converting the force along the piston rod axial direction into a force towards the cylinder head and piston rod. This ensures that the cylinder head, sealing ring, and piston rod are in close contact sequentially, preventing leakage of the medium through the gaps between them. Furthermore, the sealing rings arranged sequentially along the piston rod axial direction transmit pressure to each other and simultaneously provide multi-layer sealing to the cylinder head and piston rod, reducing the possibility of medium leakage. Finally, it ensures uniform pressure transmission between the sealing rings, preventing gaps from forming between the sealing rings and the hydraulic cylinder due to uneven force distribution. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention in use.

[0013] Figure 2 This is a cross-sectional view of the utility model structure;

[0014] Figure 3 This is a schematic diagram of the utility model structure;

[0015] As shown in the figure:

[0016] 1. Cylinder head, 2. Piston rod, 3. Sealing ring, 301. Anti-slip texture A, 302. Anti-slip texture B, 303. Sealing ring. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figure 1 , Figure 2 and Figure 3 The sealing component for a hydraulic cylinder shown in this utility model includes a sealing ring 3 disposed between the cylinder head 1 and the piston rod 2 of the hydraulic cylinder, with the cylinder head 1 and the piston rod 2 respectively fitted to the inner and outer sides of the sealing ring 3; the sealing ring 3 has a cavity structure, and the cavity inside the sealing ring 3 extends circumferentially along the sealing ring 3; a sealing groove is provided on the side of the cylinder head 1 facing the piston rod 2, the sealing ring 3 is embedded in the sealing groove, the piston rod 2 slides through the sealing ring 3, and the sealing ring 303 contracts radially along the piston rod 2 and expands axially along the piston rod 2 after being sleeved on the piston rod 2; the sealing ring 3 is made of a flexible wear-resistant material.

[0019] The sealing ring 3 is embedded in the cylinder head 1, and the piston rod 2 slides through the sealing ring 3. When the piston rod 2 slides in the cylinder, the pressure in the cylinder changes. Under the action of the pressure and driven by the piston rod 2, the sealing ring 3 is compressed axially along the piston rod 2 and expanded radially outward along the piston rod 2. The cylinder head 1, the sealing ring 3, and the piston rod 2 are in close contact in sequence. After the part where the inner side of the sealing ring 3 and the piston rod 2 are in contact wears, the inner side of the sealing ring 3 contracts inward under its own elasticity, always maintaining the close contact between the sealing ring 3 and the piston rod 2.

[0020] like Figure 1 , Figure 2 and Figure 3 The sealing rings 3 shown are arranged sequentially along the axial direction of the piston rod 2, and adjacent sealing rings 3 are fitted together.

[0021] The sealing rings 3 are sequentially embedded in the cylinder head 1, with adjacent sealing rings 3 fitting together. The piston rod 2 slides through the sealing rings 3. When the piston rod 2 slides in the cylinder, the pressure inside the cylinder changes. Under the action of the pressure and driven by the piston rod 2, the sealing rings 3 are compressed axially along the piston rod 2 and expanded radially outward along the piston rod 2. The cylinder head 1, sealing rings 3, and piston rod 2 are in close contact in sequence. The sealing rings 3 transmit pressure to each other and expand radially outward along the piston rod 2 in sequence. The sealing rings 3 are in close contact with the cylinder head 1 and the piston rod 2 in sequence. After the inner side of the sealing ring 3 and the part that fits with the piston rod 2 wears, the inner side of the sealing ring 3 contracts inward under its own elasticity, always maintaining close contact between the sealing ring 3 and the piston rod 2.

[0022] like Figure 1 , Figure 2 and Figure 3 The sealing ring 3 shown has matching anti-slip textures A301 and B302 on both sides of the piston rod 2 in the axial direction. The anti-slip textures A301 and B302 extend circumferentially along the sealing ring 3; the anti-slip textures A301 and B302 are interlocked with each other.

[0023] Adjacent sealing rings 3 are interlocked by anti-slip textures A301 and B302; pressure is evenly transmitted between adjacent sealing rings 3.

[0024] like Figure 1 , Figure 2 and Figure 3 The sealing ring 3 shown has matching anti-slip textures A301 and B302 on both sides of the piston rod 2 along the axial direction. The anti-slip textures A301 and B302 are interlocked. Adjacent sealing rings 3 are interlocked with each other through the anti-slip textures A301 and B302 to prevent pressure transmission and sliding between adjacent sealing rings 3.

[0025] like Figure 1 , Figure 2 and Figure 3 The anti-slip textures A301 and B302 shown extend circumferentially along the sealing ring 3. Pressure is uniformly transmitted between adjacent sealing rings 3.

[0026] like Figure 1 , Figure 2 and Figure 3 The sealing ring 3 shown has several sealing rings 303 extending circumferentially along the sealing ring 3 and arranged sequentially along the piston rod 2 on both its inner and outer sides.

[0027] The sealing rings 303 on the inner and outer sides of the sealing ring 3 are in close contact with the cylinder head 1 and the piston rod 2, respectively.

[0028] In actual production, the sealing rings 3 are sequentially embedded in the cylinder head 1, with adjacent sealing rings 3 fitting together and being interlocked by anti-slip textures A301 and B302. The piston rod 2 slides through the sealing rings 3. When the piston rod 2 slides in the cylinder, the pressure inside the cylinder changes. Under the pressure and driven by the piston rod 2, the sealing rings 3 are compressed axially along the piston rod 2 and expanded radially outward along the piston rod 2. The cylinder head 1, sealing rings 3, and piston rod 2 are in close contact sequentially. The sealing rings 3 uniformly transmit pressure to each other and expand radially outward along the piston rod 2 sequentially. The sealing rings 3 are in close contact with the cylinder head 1 and piston rod 2 respectively. After the inner side of the sealing ring 3 and the part in contact with the piston rod 2 wears, the inner side of the sealing ring 3 contracts inward under its own elasticity, always maintaining close contact between the sealing ring 3 and the piston rod 2.

[0029] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A seal for a hydraulic cylinder, comprising a sealing ring (3) disposed between a cylinder head (1) and a piston rod (2) of the hydraulic cylinder, wherein the inner and outer sides of the sealing ring (3) are respectively fitted to the cylinder head (1) and the piston rod (2); characterized in that: The sealing ring (3) has a cavity structure, and the cavity inside the sealing ring (3) extends circumferentially along the sealing ring (3).

2. The seal for a hydraulic cylinder according to claim 1, characterized in that: The sealing rings (3) are arranged sequentially along the axial direction of the piston rod (2), and adjacent sealing rings (3) are fitted together.

3. The seal for a hydraulic cylinder according to claim 2, characterized in that: The sealing ring (3) has matching anti-slip textures A (301) and B (302) on both sides of the piston rod (2) in the axial direction, and the anti-slip textures A (301) and B (302) are engaged with each other.

4. The seal for a hydraulic cylinder according to claim 3, characterized in that: Anti-slip texture A (301) and anti-slip texture B (302) extend circumferentially along the sealing ring (3).

5. The seal for a hydraulic cylinder according to claim 1, characterized in that: The inner and outer sides of the sealing ring (3) are provided with a number of sealing rings (303) that extend circumferentially along the sealing ring (3) and are arranged sequentially along the piston rod (2).

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