SU606016A1 - Hydraulic drive protection system - Google Patents

Description

(54) HYDRAULIC PROTECTION SYSTEM

one

The invention is intended to protect the hydraulic drive against leakage of the working fluid from the tank and the ingress of air into the hydraulic system.

The known system of protection of the hydraulic drive, containing a container for the working fluid, drain and intake piping, leakage sensors and shut-off valves on the piping, disconnecting the pump and shut-off pipelines for emergency leaks l.

The disadvantage of this system is that the shut-off valves must be designed for full flow of the working fluid in the pipelines, and, therefore, have large dimensions and weight.

The hydraulic protection system is also known; it contains a container for the working fluid, a drain pipe, an intake pipe in the form of a siphon, the knee of which is located above the maximum permissible level of liquid in the tank and has an opening at the top point that is closed during operation with a stopper, and the ascending branch of the siphon is marked According to the minimum permissible level of the liquid, it is hybriically connected to a pipe, one end of which is lowered to the depth of the liquid intake, and the second is in communication with the atmosphere 2.

This system is the closest in technical essence to the invention.

The disadvantage of the device is that in case of emergency leakage the pump is not turned off and supplies air to the hydraulic system. In addition, in the course of the movement of the mechanism, fluctuations in the level of the liquid in the tank and the entry of air into the hydraulic system through a pipe, which communicates the tank with the atmosphere, are possible. In case of destruction of the drain pipe below the level of the liquid in the tank, the device does not protect the hydraulic drive from leakage through the drain pipe. All these shortcomings significantly reduce the reliability of the hydraulic drive.

The aim of the invention is to improve the reliability of the protection of the hydraulic drive.

Claims (2)

This is achieved by the fact that the system is equipped with a leak detector for the working fluid and a control unit. The drain pipe, as well as the intake pipe, is made in the form of a siphon with a knee located above the permissible level of liquid in the tank and having an opening for communication with the atmosphere, with the pipe holes being closed with valves. The leakage detector is connected to the valves and the pump through the control unit. FIG. 1 shows schematically the protection system of the hydraulic drive, in which the opening of each siphon is closed by a separate valve; Fig. 2 shows the same situation in the case of connecting the siphon openings with a pipeline with an opening closed by one valve. The system contains a container 1 for the working fluid, drain 2 and intake 3 pipelines. Piping 2 and 3 are made in the form of siphons, bends 4 and 5 of which are elevated above the maximum permissible level of liquid in tank 1. Bends 4 and 5 have holes 6 and 7, respectively, for communication with the atmosphere, closed with valves 3 and 9. The system is equipped with fluid leak detector 10, which is associated with with valves 8 and 9 and pump 12 through the control unit 11. The warning lamp 10 can be located either in the tank (as shown in the drawing) or in the hydraulic line. Holes 6 and 7 in elbows 4, 5 of the fusion, 2 and intake 3 pipelines can be connected by pipeline 13 of small section, opening 14 of which is closed by valve 15 (see figure 2). The protection system of the hydraulic drive works as follows. When the hydraulic line breaks, the leakage alarm of the working fluid 10 is triggered. The control unit 11 sends a signal to the valves 8 and 9 and the pump engine 16 The valves 8 and 9 open together with the air and the intake pipelines 2, 3 with the atmosphere, and the pump engine 16 turns off. The air enters the siphon, fills elbows 4 and 5, and the flow of fluid disrupts. The fluid in knees 4 and 5 is partially merged into tank 1 and partially into pipe 2 and 3. Thus, if there is a break in the hydrolines, the flow of fluid in the intake and drain pipes and the pump stop simultaneously. This eliminates the leakage of fluid from the tank and the penetration of air into the hydraulic system. It also eliminates the possibility of air entering the hydraulic system due to changes in the level of the working fluid in the tank when the mechanism is moving, because from the version in the knees the siphons are closed by valves. When repairing the hydraulic valves 8 and 9 open manually. The invention The protection system of the hydraulic drive, containing a container for the working fluid, a drain pipe, an intake pipeline in the form of a siphon, the knee of which is located above the maximum permissible level of liquid in the tank and has an opening at the top point for communication with the atmosphere. In order to increase reliability, the system is equipped with a leak detector of the working fluid and a control unit, the drain pipe is also made in the form of a siphon with a knee located above the permissible level of liquid in a tank They have an opening for communication with the atmosphere, the pipeline openings are closed by valves, and the leakage warning device is connected to the valves and the pump through a control unit. Sources of information taken into account in the examination: 1. Dubrovsky O.N. and others. Hydraulic drives of ship mechanisms, L., Shipbuilding, 1963, p.174-176, 2. USSR author's certificate number 358581, cl. F 17 C 13/00, 1971. Hydrofluoric CfluS fuii in the system 73 15 1-G .J I yy GB I