SU1286805A1 - Piston pump - Google Patents

Abstract

The invention relates to a pump engineering technique and can be used, in particular, in various power devices for creating high hydraulic pressure. The purpose of the invention is to reduce the energy costs of the pump drive during its operation in the low pressure (LP) mode. The control line 16 for hydraulic control of the two-position three-way distributor 17 is connected to the working chamber (RK) 6 ND. The high pressure injection valve 14 of the RK 10 is made hydraulically controlled, while its control cavity 18 is connected to the RK 6 ND and the tank 15 through a hydraulically controlled valve 17. Until the pressure in the RK 6 ND reaches the specified value, the valve 14 hydraulically locks the RK 10 In this case, only the piston 4 ND is moved in the cylinder 2 with maximum delivery. 1 il. (L tND 00 O) 00 o JV

Description

The invention relates to a pump engineering technique and can be used, in particular, in various power devices for creating high hydraulic pressure.

The purpose of the invention is to reduce the energy cost of driving the pump when it is operating in low pressure mode.

The drawing shows a schematic diagram of a piston pump.

The piston pump contains cylinders 2 and 3 coaxially located inside the housing 1, in which the low pressure piston 4 and the high pressure piston 5 are mounted, which are axially displaced relative to each other and form a low pressure between the pistons 4 and 5

The low pressure piston 4 and the high pressure piston 5 are connected to each other through a spring 7 and a telescopic rod 8,

The high pressure piston 5 is made in two stages with the formation under the stage 9 of a smaller diameter of the high pressure working chamber 10.

The working chambers of low 6 and high 10 pressure are connected through suction and discharge valves 11 12 and 13, 14, respectively, with tank 15 and with consumer (not shown).

The control line 16 of the hydraulically controlled two-position three-line distributor 17 is connected to the low-pressure working chamber 6, and the discharge valve 14 of the high-pressure working chamber 10 is hydro-controlled. At that, its control cavity 18 is connected to the low-pressure working chamber 6 and the tank 15. through a hydraulically controlled distributor 17.

The piston pump comprises a manual actuator in the form of a handle 19, kinematically connected with a low pressure piston 4, a bypass valve 20. A low pressure working chamber 6

It can be additionally communicated to the control cavity 18 of the valve 14 through a check valve 21 and a hydraulically controlled valve 17 with a spring 22.

Piston pump works as follows.

In the initial period, with no load on the cylinders (not

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35 30

40

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shown) by swinging the handle 19, only the low pressure piston 4 in the cylinder 2 is moved, ensuring maximum supply of, for example, oil from the tank 15 through the initial valve 13 to the consumer. While the high-pressure piston 5 is in place, pressed in its upper position to the housing 1 by the force of the spring 7,

When the pressure in the low pressure chamber 6 is increased, the force in the cavity 18 of the control valve 14 is increased, locking the high pressure injection system while maintaining the immobility of the high pressure piston 5.

In a hydraulically controlled valve 17 at low pressures in the low pressure working chamber 6 and under the influence of the spring 22, the tank 15 is disconnected from the valve 17. Oil from the low pressure chamber 6 enters the control cavity 18 through a check valve 21 and valve 17.

When the set pressure in the low pressure chamber 6 is reached, the force of the spring 22 is overcome, and the control cavity 18 is disconnected from the low pressure chamber 6 and communicates with the tank 15, with the result that the pump switches to high pressure.

Both pistons 4 and 5 with the fluid volume enclosed between them in the low-pressure working chamber 6 turn into a single piston. As the relative relative movement of the pistons 4 and 5 ceases, the volume of the working chamber 6 becomes constant and the low pressure system of the pump ceases to function.

The use of the invention allows to significantly reduce the energy costs of driving the pump when it is operating in low pressure mode as a result of hydraulic locking of the high pressure working chamber.

Claims (1)

Invention Formula A piston pump comprising coaxially arranged cylinders inside the housing, in which a low pressure piston and a high pressure piston are mounted, which are axially displaceable relative to each other and to be formed between 3 12868054 pistons of the low pressure working chamber so that, in order to reduce energy, the low pressure costs of the pump drive laziness and the high pressure piston when it is operating in the low pressure mode is interconnected by itself through the spring of the yalene, it is equipped with a hydraulically controlled a telescopic piston, a high-5 two-position three-line expansion pressure piston is made by a two-stage-divider, the control line of which is tyn with the formation of a low diameter of the working chamber of the high pressure, and the discharge valve of the pressure, with the working chambers of the high pressure of the low pressure and high pressure, about the fully hydraulically controlled, and its we are connected through the intake and supercharger-control cavity with the working Valves with a low pressure chamber and a consumer consumer tank, respectively, are distinguished by a hydraulically controlled valve.