RU1828967C - Sealing device for hydraulic cylinder rod - Google Patents

Abstract

SUMMARY OF THE INVENTION: sealing elements are placed in the housing, there is a cavity between the edges. An annular partition is made in the cavity with the formation of chambers communicating with each other by channels, the axes of which are made at an angle to the axis of the rod and tangentially to its circumference. The chamber from the side of the high pressure cavity of the hydraulic cylinder is connected through a check valve to the supply line, and the other to the drain line. 2 ill.

Description

The invention relates to mechanical engineering, in particular to sealing technology, and can be used, for example, in power cylinders.

The purpose of the invention is to increase the reliability of the sealing device of the hydraulic cylinder rod when working with a medium with abrasive particles.

Figure 1 shows a schematic diagram of a sealing device with connecting the cavity between the sealing elements to the drain line of the main hydraulic system; figure 2 is a section aa in figure 1.

The sealing device of the hydraulic cylinder 1 is made in the housing of the cover with a cavity located between the inner 2 and outer 3 sealing elements. The cavity in its middle part is divided by a partition 4 into chambers 5 and 6 communicating with each other by channels 7. The axes of the channels are located at an angle to the axis of the rod 8 and tangentially to its surface. The chamber 5 is connected through a check valve 9 to the drain

line 10 of the main hydraulic system 11. And the chamber 6 - to the additional drain branch 12 with a check valve 13 and a filter 14 for cleaning the fluid sent to the tank 15 of the hydraulic system.

The sealing device operates as follows.

During operation of the hydraulic pump and turning on the hydraulic distributor of the main hydraulic system 11 to any of positions I, II, III, the liquid from the drain line 10 enters the chamber 5 through the non-return valve 9 and, directed through the channels 7 of the partition 4, enters the rod 8. taken into the chamber 6 through the channel 7 at an angle to the axis of the rod 8 and tangentially to its surface, flushes the abrasive particles entering through the sealing element 3 from the surface of the rod. This prevents the abrasive particles from entering the chamber 5, and even more so P smallness gi rotsilin- nucleus.

Contaminated liquid is removed through a non-return valve 13 and a filter 14. after

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which purified liquid is discharged into the oil tank 15.

In addition, since the pressure in the cavity 6 is negligible and is mainly determined only by the resistances in the filter 14 and the check valves 9 and 13, which can be adjusted to an arbitrarily low pressure, liquid leakage through the sealing element 3 is eliminated.

The use of the proposed sealing device allows to increase the reliability of the seal, to eliminate leakage of fluid from the hydraulic cylinder under any operating conditions and to increase the durability of the wear of the rod, sealing elements and other elements of the hydraulic system.

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Claims (1)

The claims A hydraulic cylinder rod sealing device comprising sealing elements located in the housing, a cavity between them and a hydraulic system with a supply line and a drain line including non-return valves, characterized in that an annular partition is made in the cavity to form chambers communicating with each other by channels whose axes are made at an angle of the rod’s oblique and tangent to its surface, while the chamber from the side of the high-pressure cavity of the hydraulic cylinder is connected through a check valve to the supply line, another - the drain line. fifteen 2 5 ± 1 12 ft U, g AA / increased / FIG. 2