JPS5841521B2 - pressure control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control valve arrangement for generating a fluid pressure that is approximately a constant value higher than a control pressure.

The control valve device according to the present invention includes a piston-shaped valve member slidably disposed in a cylinder whose one end is connected to a pump output, and the valve member moves away from the one end portion against the spring action of a spring. A circumferential groove is provided in the cylinder so as not to be blocked by the valve member when the cylinder moves in the direction, and the output pressure of the pump is controlled.
Another cylinder is provided in which the circumferential groove is connected to the discharge port, and one end of which is connected to the pump output through a throttle, and a valve member disposed within the cylinder, and the cylinder has the discharge port and the valve. a centrifugal force device acting on a member and forcing it toward one end of the cylinder to block the outlet so that the pressure at the one end of the cylinder is proportional to the square of the velocity; A flow path is provided that communicates the one end of the cylinder with the other end of the cylinder, so that the output pressure of the pump is higher than the pressure in the cylinder by the pressure determined by the force applied by the spring. It is characterized by controlling.

The present invention will be explained with reference to the drawings.

The figure shows a control valve arrangement according to the invention.

This device has a control pressure cylinder 10 as a device for generating control pressure, and a valve member 11 is slidably disposed therein.

A conduit 12 is communicated with one end of a control pressure cylinder 10, and a throttle 13 is provided at the inlet of the cylinder 10.

Conduit 12 connects to the outlet of pump 14 .

A discharge port 16 is formed in the wall of the cylinder 10 and can be opened and closed by a valve member 11.

Mechanical pressure is applied to the opposite surface of the valve member 11 in opposition to the force applied to the valve member 11 surface by the hydraulic pressure within the cylinder.

From the pump 14 to the cylinder 10 via the conduit 12 and the throttle 13
The pressurized fluid flowing inside pushes the valve member 11 to the right, and the valve member 11 stops at a position that balances the force of the mechanical device acting on the valve member 11 from the right, and a corresponding pressure is applied to the cylinder. Occurs within 10 days.

When the discharge pressure of the pump 14 increases, the valve member 11 moves to the right and balance is again established within the cylinder 10.

The illustrated example has a pair of centrifugal weights 17 as a device for generating mechanical pressure.

When the centrifugal weight 17 rotates about an axis (not shown), it acts on the valve member 11 so as to apply a force proportional to the square of the rotational speed.

Therefore, the fluid pressure within the cylinder 10 changes in proportion to the square of the driving speed of the centrifugal weight 17. The conduit 12, which communicates with the discharge port of the pump 14, is further communicated with one end of the cylinder 18.

A piston-shaped control valve member 19 is slid into the cylinder 18 .

On the opposite side of the valve member 19, i.e. the lower side in the figures, there is provided an elastic device, in the example shown a spring 20, which produces a spring force counteracting the fluid pressure acting on the upper side of the cylinder 18.

Further, a conduit 15 is provided between the lower surface of the cylinder 18 and the wall surface of the cylinder 10, and a spring 20 is connected to the control pressure in the cylinder 10.
In addition to the force, a fluid pressure on the top surface of the cylinder 18 is created.

A circumferential groove 21 is provided on the entire circumference of the wall surface of the cylinder 18, and the circumferential groove 21 is communicated with the discharge port 22.

This circumferential groove 21 forms an overflow channel controlled by the valve member 19.

In operation of this device, the fluid pressure acting on the upper end of the control valve cylinder 18, that is, the discharge pressure of the pump 14 is
The spring 20 acting on the surface of the cylinder 10 presses down the valve member 19 against the force of the control pressure generated in the cylinder 10.
8, and this pressure is applied to cylinder 1 in the example shown.
A control pressure of 0 results in a constant pressure due to the Kabras spring 20.

By using the circumferential groove 21 as a liquid reservoir discharge passage, a slight movement of the control valve member 19 causes a large change in the cross-sectional area of the liquid drainage passage.

Therefore, even if the pressure change in the output of the pump 14 acting on one upper end of the cylinder 18 is large, the acting force of the spring 20 remains approximately constant.

The control valve described above is particularly advantageous for a fuel pump device for supplying fuel to an internal combustion engine.

In devices of this type, it is preferred that the various control functions be performed by pressure-responsive members that receive pressures that vary in proportion to the square of the speed at which the device is driven.

This control pressure is generated in the cylinder 10 and led out from the conduit 15 by a branch conduit (not shown).

At the same time, it becomes necessary to perform other control functions by means of a member that receives a pressure that is greater by a predetermined value than the pressure that varies in proportion to the square of the speed.

This pressure is created in the cylinder 18 and in the example shown in the conduit 1
It is led out from the branch conduit 23 of No. 2.

[Brief explanation of the drawing]

The figure is a schematic system diagram showing a pressure control valve according to the present invention. 10...Control pressure cylinder, ICl3...
...Valve member, 12, 15, 23... Conduit, 13
...Aperture, 14...Pump, 16...
...Discharge boat, 1T...Centrifugal weight, '18
... Control valve cylinder, 20 ... Spring,
21... Circumferential groove.

Claims (1)

[Claims] 1. A piston-shaped valve member 19 slidably disposed within a cylinder 18 whose one end is connected to a pump output, and this valve member 1.
A circumferential groove 21 is disposed in the cylinder 18 so as not to be blocked by the valve member 19 when the valve member 9 moves in a direction away from the one end against the spring action of the spring 20, thereby reducing the output of the pump 14. A pressure control valve device for controlling pressure includes another cylinder 10 in which the cylindrical groove 21 is connected to the discharge port 22 and one end of which is connected to the pump output through a throttle 13, and a valve member disposed within this cylinder 10. 11, and this cylinder 10 has a discharge port 16.
Et6 acts on the valve member 11 and presses it toward one end of the cylinder 10, closing the discharge port 16 so that the pressure at the one end of the cylinder 10 is proportional to the square of the velocity. A centrifugal force device 17 is provided, and a passage 15 is provided that communicates the one end of the cylinder 10 with the other end of the cylinder 18, so that the output pressure of the pump 14 is relative to the pressure inside the cylinder 10. , a pressure control valve device that controls the pressure value to be higher by the pressure determined by the force applied by the spring 20.