Efficient sealing oil hydraulic cylinder

Abstract

The utility model discloses an efficient sealing oil hydraulic cylinder, and relates to the technical field of oil hydraulic cylinders, the efficient sealing oil hydraulic cylinder comprises a cylinder body, a cylinder cover and a plug rod, the plug rod used for outputting mechanical energy is installed in the cylinder body, a piston head is installed on one side of the plug rod, and the cylinder cover is arranged at the joint of the plug rod and the cylinder body; a sealing structure is arranged at the communication position of the cylinder cover and the piston rod, a lower rubber layer is arranged at the contact position of the sealing device and the piston rod, an inner lip is arranged above the lower rubber layer, a supporting layer is arranged on the side, away from the piston head, of the inner lip, and an upper rubber layer is arranged below the cylinder cover. An outer lip connected with the supporting layer is arranged below the upper rubber layer, and an oil filling layer for buffering oil pressure is arranged between the inner lip and the outer lip. By means of double sealing of the inner lip and the outer lip and the design of the double-layer rubber ring, hydraulic oil leakage is effectively prevented, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and more specifically to a high-efficiency sealed hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are actuators in hydraulic systems, used to convert hydraulic energy into mechanical energy. The seals of hydraulic cylinders (such as O-rings, Y-rings, and V-rings) are crucial components for preventing oil leakage. Over time, these seals may lose their sealing performance due to aging, wear, or deformation.

[0003] The existing hydraulic cylinder, as shown in application number CN201711324614.5, "A Sealing Structure for an Ultra-High Pressure Hydraulic Cylinder", further ensures the sealing of the device by adjusting the tightness between the inner and outer rubber rings and each component. However, there is no buffer zone when the hydraulic pressure impacts the connecting layer, which is prone to wear after long-term operation. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-efficiency sealed hydraulic cylinder.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] This utility model proposes a high-efficiency sealed hydraulic cylinder, including a cylinder body, a cylinder head, and a piston rod. The piston rod for outputting mechanical energy is installed inside the cylinder body. A piston head is installed on one side of the piston rod. A cylinder head is provided at the connection between the piston rod and the cylinder body. A sealing structure is provided at the connection between the cylinder head and the piston rod. A lower rubber ring is provided at the contact point between the sealing structure and the piston rod. An inner lip is provided above the lower rubber ring. A support layer is provided on the side of the inner lip away from the piston head. An upper rubber ring is provided below the cylinder head. An outer lip connected to the support layer is provided below the upper rubber ring. An oil-flushing layer for buffering oil pressure is provided between the inner and outer lips.

[0007] As a preferred embodiment of this invention, the piston rod is connected to a rod ring for hinged working device on the side away from the piston head.

[0008] As a preferred embodiment of this invention, the support layer is made of high-pressure resistant rubber material and is used to buffer the oil pressure impact of the oil-flushing layer.

[0009] As a preferred technical solution of this utility model, the shape of the oil flushing layer is narrow on the outside and wide on the inside, so as to buffer the pressure of the oil rushing into the connection.

[0010] As a preferred embodiment of this utility model, the sealing structure is installed at the connection between the cylinder head and the piston rod by a snap-fit ​​method.

[0011] The beneficial effects of this utility model are as follows:

[0012] The design of the sealing structure of this utility model can effectively prevent hydraulic oil leakage and improve sealing performance; the double seal of the inner and outer lips may be more reliable than the single-layer seal; the support layer is made of high-pressure resistant material, which can enhance the durability of the sealing structure and extend its service life; the shape design of the flushing layer may help to disperse oil pressure, reduce impact force, and improve system stability; the design of the double-layer rubber ring buffers the oil pressure impact at the connection and enhances the sealing performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is an enlarged view of point A of this utility model;

[0015] Figure 3 This is a schematic diagram of the sealing structure of this utility model.

[0016] Reference numerals: 1. Cylinder head; 2. Plug rod; 3. Piston head; 4. Connecting port; 5. Rod ring; 6. Sealing structure; 7. Cylinder block; 11. Lower rubber ring; 12. Inner lip; 13. Outer lip; 14. Upper rubber ring; 15. Support layer; 16. Oil flushing layer. Detailed Implementation Example 1

[0017] like Figures 1 to 3 As shown, this utility model proposes a high-efficiency sealed hydraulic cylinder, including a cylinder body, a cylinder head, and a piston rod.

[0018] The cylinder body is a cylindrical structure made of high-strength steel with a smooth inner wall for mounting the piston rod. A cylinder head mounting hole is located at the top of the cylinder body for securing the cylinder head. The cylinder head is mounted on top of the cylinder body and secured with bolts. A through-hole for mates with the piston rod is located in the center of the cylinder head, and a sealing structure is installed at the through-hole to prevent hydraulic oil leakage. The piston rod is a cylindrical rod installed inside the cylinder body, with one end connected to the piston head and the other end extending outside the cylinder body. The surface of the piston rod is chrome-plated to improve wear resistance and corrosion resistance. The piston head is mounted on one end of the piston rod and contacts the hydraulic oil inside the cylinder body. The piston head is made of polyurethane material, providing good sealing and wear resistance.

[0019] The sealing structure is installed at the connection between the cylinder head and the piston rod to prevent hydraulic oil leakage. The sealing structure includes the following parts: lower rubber ring: installed at the contact point between the sealing structure and the piston rod, made of EPDM rubber, with good oil resistance and sealing performance; inner lip: located above the lower rubber ring, used to enhance the sealing effect; support layer: made of high pressure resistant rubber material, installed on the side of the inner lip away from the piston head, used to buffer the oil pressure impact of the flushing layer; upper rubber ring: installed below the cylinder head (1), connected to the support layer; outer lip: located below the upper rubber ring, connected to the support layer, used to further enhance the sealing effect; flushing layer: set between the inner lip and the outer lip, with a shape that is narrow on the outside and wide on the inside, used to buffer the pressure of oil rushing into the connection.

[0020] The rod ring is installed at the end of the piston rod away from the piston head and is used to articulate the working device; the rod ring is made of alloy steel and the surface is hardened, which has high strength and wear resistance.

[0021] Working Principle: When hydraulic oil enters the cylinder, the piston head is pushed by the pressure of the hydraulic oil, driving the piston rod to move, thereby outputting mechanical energy. Simultaneously, the sealing structure, through the synergistic action of the inner lip, outer lip, support layer, and flushing layer, effectively prevents hydraulic oil leakage. Lower and upper rubber rings: Installed at the contact points between the sealing structure and the piston rod and cylinder head, respectively, providing initial sealing. Inner and outer lips: Through special shape design, they enhance the sealing performance of the sealing structure, preventing hydraulic oil leakage from gaps. Support layer: Made of high-pressure resistant rubber material, it can withstand high pressure, buffering the oil pressure impact of the flushing layer and extending the service life of the sealing structure. Flushing layer: Adopting a narrow outer and wide inner shape design, it can effectively disperse oil pressure, reduce the pressure of oil rushing into the connection, and improve system stability.

[0022] The rod ring is installed at the end of the piston rod and is used to articulate the working device; through the connection of the rod ring, the hydraulic cylinder can flexibly cooperate with the external working device to complete a variety of work tasks.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency sealed hydraulic cylinder, comprising a cylinder body (7), a cylinder head (1), and a piston rod (2), characterized in that: The cylinder body (7) is equipped with a piston rod (2) for outputting mechanical energy. A piston head (3) is installed on one side of the piston rod (2). A cylinder cover (1) is provided at the connection between the piston rod (2) and the cylinder body (7). A sealing structure (6) is provided at the connection between the cylinder cover (1) and the piston rod (2). A lower rubber ring (11) is provided at the contact point between the sealing structure (6) and the piston rod (2). An inner lip (12) is provided above the lower rubber ring (11). A support layer (15) is provided on the side of the inner lip (12) away from the piston head (3). An upper rubber ring (14) is provided below the cylinder cover (1). An outer lip (13) connected to the support layer (15) is provided below the upper rubber ring (14). A buffer oil layer (16) is provided between the inner lip (12) and the outer lip (13).

2. The high-efficiency sealed hydraulic cylinder according to claim 1, characterized in that: The piston rod (2) is connected to a rod ring (5) for hinged working device on the side away from the piston head (3).

3. The high-efficiency sealed hydraulic cylinder according to claim 1, characterized in that: The support layer (15) is made of high-pressure resistant rubber material and is used to buffer the oil pressure impact of the oil-filled layer (16).

4. The high-efficiency sealed hydraulic cylinder according to claim 1, characterized in that: The oil flushing layer (16) is narrow on the outside and wide on the inside to buffer the pressure of the oil entering the connection.

5. The high-efficiency sealed hydraulic cylinder according to claim 1, characterized in that: The sealing structure (6) is installed at the connection between the cylinder head (1) and the piston rod (2) by means of a snap-fit.

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