CN207161712U - A kind of novel piston rod double-channel sealing structure - Google Patents

Abstract

The utility model discloses a novel piston rod double-channel sealing structure, which comprises an actuator piston rod (1), an actuator cylinder end cover (2) and a sealing ring, which are on the inner wall of the center hole of the cylinder end cover, In the direction of the internal pressure oil to the external air, the first seal ring groove (2a) and the second seal ring groove (2b) are opened in sequence, the cross sections of which are all rectangular, and are set in the first seal ring groove (2a) There is a spring sealing ring (3) with a U-shaped cross section; a combined sealing ring (4) is arranged in the second sealing ring groove (2b), and the combined sealing ring (4) includes a polytetrafluoroethylene seal for sealing Ring (4a), O-shaped rubber ring (4b) for pressing the sealing surface, plastic protection ring (4c) and copper ring protection ring (4d). The utility model is suitable for a wide range of temperatures and can meet the requirements of high and low temperature use. At the same time, it has excellent high and low pressure sealing performance, high reliability of the sealing structure, and long wear-resistant service life, which meets the sealing requirements of the new actuator design.

Description

A New Type of Piston Rod Double Sealing Structure

technical field

The utility model belongs to the hydraulic sealing technology and relates to an improvement of the sealing structure between the piston rod and the end cover of an actuator.

Background technique

At present, the sealing structure between the actuator piston rod and the end cover generally adopts an O-shaped rubber seal. There are two sealing ring grooves with a rectangular section on the inner wall of the center hole of the end cover of the actuator housing. O-shaped nitrile rubber sealing rings are installed in the ring grooves. The disadvantages are: the first nitrile rubber has a small temperature range and poor performance in high-temperature working environments; the second rubber material has low hardness and is easily damaged, resulting in seal failure; the third rubber material has poor wear resistance and is easy to wear and has a short service life.

Contents of the invention

The purpose of the utility model is to propose a new double-channel sealing form of the piston rod of the actuator, which has a wide temperature range, excellent high and low pressure sealing performance, high reliability, and long wear-resistant service life.

The technical scheme of the utility model is: a novel piston rod double-channel sealing structure, which is characterized in that it includes the actuator piston rod 1, the actuator cylinder end cover 2 and the sealing ring, and the inner wall of the center hole of the cylinder end cover Above, in the direction of the internal pressure oil to the external air, the first sealing ring groove 2a and the second sealing ring groove 2b are opened in sequence, the cross sections of which are all rectangular, and the first sealing ring groove 2a is provided with a cross section It is a U-shaped spring sealing ring 3; a combined sealing ring 4 is arranged in the second sealing ring groove 2b, and the combined sealing ring 4 includes a polytetrafluoroethylene sealing ring 4a for sealing, an O-shaped sealing ring for pressing the sealing surface Rubber ring 4b, plastic protection ring 4c and copper ring protection ring 4d.

The utility model has the advantages of wide application temperature, meeting the requirements of high and low temperature use, excellent high and low pressure sealing performance, high reliability of the sealing structure, long wear-resistant service life, and meeting the sealing requirements of the new actuator design.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them, the piston rod 1, the actuator cylinder end cover 2, the first sealing ring groove 2a, the second sealing ring groove 2b, the spring sealing ring 3, the combined sealing ring 4, the polytetrafluoroethylene sealing ring 4a, the O-shaped rubber Ring 4b, plastic protection ring 4c, copper ring protection ring 4d.

Detailed ways

The new type of actuator piston rod double-channel sealing form, including the actuator piston rod 1, the actuator cylinder end cover 2 and the sealing ring, on the inner wall of the center hole of the cylinder end cover, between the internal pressure oil and the external air In the direction, the first seal ring groove 2a and the second seal ring groove 2b are successively opened, the cross sections of which are all rectangular, and a spring seal ring 3 with a U-shaped cross section is arranged in the first seal ring groove 2a; The combined sealing ring 4 is arranged in the secondary sealing ring groove 2b, and the combined sealing ring 4 includes a polytetrafluoroethylene sealing ring 4a for sealing, an O-shaped rubber ring 4b for pressing the sealing surface, a plastic protection ring 4c and a copper ring Guard ring 4d.

The working principle of the utility model is: the temperature range of the normal operation of the spring seal ring 3 is -65°C to 316°C, and the temperature range of the normal operation of the combined seal ring 4 is -54°C to 200°C. Because the spring sealing ring 3 is installed in the first sealing ring groove 2a, the working range of the sealing structure is -65°C to 316°C.

The maximum sealing pressure of the spring sealing ring 3 in normal operation is 42MPa, and the maximum sealing pressure of the combined sealing ring 4 in normal operation is 21MPa. After the oil pressure on the left side passes through the first sealing ring groove 2a and the spring sealing ring 3, the pressure drops rapidly to form a low-pressure area between the first sealing ring groove 2a and the second sealing ring groove 2b. In fact, the second The sealing ring groove 2b and combined sealing ring 4 only need to seal the low-pressure oil. At the same time, the contact area between the sealing lip of the spring sealing ring 3 and the actuator piston rod 1 is small, and the contact area between the combined sealing ring 4 and the actuator piston rod 1 is large, and the sealing effect of the combined sealing ring 4 is better. Because the high-pressure oil passes through the first sealing ring groove 2a and the spring sealing ring 3 to reduce the pressure, and then passes through the second sealing ring groove 2b and the combined sealing ring 4 for better sealing effect, so the excellent performance under high pressure of the oil is realized. Sealing effect.

Because the spring sealing ring 3 and the combined sealing ring 4 are two different sealing structures, when one structure fails due to some reason, the possibility of another structure failing due to the same reason is small, so the normal sealing structure of the whole is guaranteed. Work, improve the reliability of the double seal structure of the actuator piston rod 1.

The thermal deformation of the metal is small, and the hardness of the polytetrafluoroethylene plastic is high, and the wear resistance is good. The spring sealing ring 3 adopts a metal spring as the pressing device of the sealing contact surface, which has small deformation at high temperature, and its outer jacket is made of polytetrafluoroethylene plastic material, and the contact area between the sealing lip and the actuator piston rod 1 is small , the amount of wear is small; the sealing part in contact between the combined sealing ring 4 and the actuator piston rod 1 is also a polytetrafluoroethylene plastic material, which has high hardness and low wear, and will not cause damage to the sealing structure due to extrusion deformation. Therefore, the designed novel double-channel seal structure of the actuator piston rod 1 is wear-resistant and has a long service life.

In an implementation example of the present utility model, this novel actuator piston rod double-channel sealing structure is adopted, the working temperature is -55°C to 240°C, the working pressure is 35MPa, and the sealing effect is still good after 600 hours of use.

Claims (1)

1. A novel piston rod double-channel seal structure is characterized in that it comprises an actuator piston rod (1), an actuator cylinder end cover (2) and a sealing ring, on the inner wall of the cylinder end cover center hole, In the direction of the internal pressure oil to the external air, the first sealing ring groove (2a) and the second sealing ring groove (2b) are sequentially opened, the cross sections of which are all rectangular, in the first sealing ring groove (2a) A spring sealing ring (3) with a U-shaped cross section is provided; a combined sealing ring (4) is provided in the second sealing ring groove (2b), and the combined sealing ring (4) includes polytetrafluoroethylene for sealing Sealing ring (4a), O-shaped rubber ring (4b) for pressing the sealing surface, plastic protection ring (4c) and copper ring protection ring (4d).