SU1305455A1 - Hydraulic system - Google Patents

Abstract

Invention m. used in hydraulic systems of mobile machines and allows to increase the speed. The throttle is installed in the suction line 7 of the pump parallel to the locking element 8, made in the form of a spring-loaded valve 9 with a cavity (II) 10 of the control. During normal operation of the system, the flow creates a small pressure in the discharge line 4 (0.2-0.4 MPa), which is enough to hold the spool 12 in a position that ensures free passage of fluid through the shut-off device. In order to expand functionality when connecting to the suction line 7 of the main pump of the additional pump 17, the valve 9 is provided with an additional control P 1, located opposite the P 0, and an additional spring 13. P II is connected to the drain line 19 of the pump 17 between its distributor 18 and filter 20. The overlap of the fluid supply to the pumps enters when the flow stops in any Drain line, i.e. in case of accident of any of the elements of the hydraulic system. 1 3.P. f-ly, 4 ill. From $ (L with

Description

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The invention relates to hydraulic systems for general engineering purposes and can be used in hydraulic systems of mobile machines.

The purpose of the invention is to increase the speed of the hydraulic system, as well as to expand its functionality when connecting an additional pump to the suction line of the main pump

Fig, is a diagram of the hydraulic system with a single pump; FIG. 2 is a section A-A in FIG. FIG. 3 is a hydraulic system diagram when an additional pump is connected to the suction line of the main pump; FIG. 4 is a hydraulic system with two separate pumps.

The hydraulic system (Fig. 1) contains a pump 1, a distributor 2 connected by a pressure line 3 to a pump 1 and a drain line 4 through a filter 5 to a tank 6, the pump 1 being connected by a suction line 7 through a locking element 8 to a tank 6,

A valve 9 with a control cavity 10, an additional cavity II, an opposite cavity 10, and a spool 12. A spring 13 is installed in the cavity 1, and a cavity IO is provided with a mechanical control element 14 and connected to a drain line 4 between the distributor 2 and filter 5, and the valve 9 is made normally closed two-position.

Parallel to the locking element 8 in the suction line 7, a choke 15 is installed, made in the form of a channel of small section, with the locking device 16 (Fig. 2).

The hydraulic system (FIG. 3) is equipped with an additional pump 17 with a distributor 18, a drain line 19 and a filter 20, the drain line 19 is connected to the tank 6, the cavity 10 of the valve 9 is equipped with an additional spring, the opposite spring 13, and the cavity 11 is connected to the drain line 19 between the distributor 18 and the filter 20, the valve 9 here playing the role of a three-position valve,

In the hydraulic system (FIG. 4), the same system with an iacocoM 21 having a valve 22, a drain line 23 connected via a filter 24 to the tank 6 is connected to the tank 6 parallel to the pump system 1, and the suction line 25 of the pump 21 is connected via an analog

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with valve 18, valve 26, having cavities 27 and 28, with tank 6,

The difference lies in the fact that the cavity 10 of the control valve 9 is connected to the drain line 23 of the pump 21, and the cavity 28 of the valve 26 is connected to the drain line 4 of the pump 1,

The hydraulic system (Fig, 1 and 2) works as follows.

Before starting operation by pressing the mechanical element 14, the locking element 8 is opened and the pump 1 is put into operation. During normal operation of the system, the flow creates a slight pressure in the discharge line 4 (0.2-0.4 MPa), which is enough to hold the spool 12 in position providing free passage of fluid through the locking device.

In the event of an accident in the system (rupture of pipelines), there is a sharp decrease in pressure in the discharge line 4, as the flow of fluid through line 4 stops. This causes the suction line 7 to shut off by the spool 12 of the valve 9 under the action of the spring 13. The choke 15 ensures that a small amount of fluid enters the pump 1 to lubricate it.

Thus, the emergency discharge of liquid from the tank is terminated.

Hydraulics (fig.Z and 4) work similarly. The difference lies in the fact that the overlapping of the supply of fluid to the pumps occurs when the flow in any drain line, t, e, is stopped in the event of an accident of any of the hydraulic system elements.

Claims (2)

Invention Formula 1, A hydraulic system comprising a pump, a tank, a distributor connected by a drain line through a filter with a tank and a pressure line with a pump, the suction line of which is connected to the tank through a removable element, characterized in that, in order to improve speed, it is equipped with a throttle installed in the suction line of the pump parallel to the shut-off element, which is made in the form of a spring-loaded valve with a control cavity connected to the drain line between the valve and the filter and equipped with a mechanical control element. . . 313054 2. The hydraulic system according to claim 1, which is designed so that, in order to extend the functionality when connecting to the suction line of the main pump, additional-. 5 it has a pump equipped with its distributor and a drain line with 1ltrom, the valve is equipped with a second up554 equating the cavity located opposite the first control cavity, an additional spring placed opposite the first spring, the second control cavity being connected to the drain line of the additional pump between its distributor and its filter. Fig.} FIG. 2 Figm