JPS59103081A - Fixed quantity delivery valve - Google Patents

Abstract

PURPOSE:To enable to make flow control of an intermittent flow by correct fixed quantity delivery, by a method wherein a plunger is moved by the movement of a spool and a fixed quantity of working liquids in the right and left chambers to be generated through the movement of the plunger are made to discharge alternately. CONSTITUTION:A hydraulic liquid entered through an inlet port 22 is arrived at a flow chamber 28 through a liquid groove 16, a liquid ducts 24, 26 and a plunger 2 is moved to the left by pressing it. A fixed quantity of a working liquid in a liquid chamber 27 is discharged through a check valve 31 by passing from liquid ducts 25, 23 through liquid grooves 15, 14 and a liquid duct 29. Simultaneously with the above, the number of delivery times is counted by a count detector through a touch of an end of a rod of the plunger 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve that discharges a fixed amount, in which a plunger is moved in accordance with the movement of a spool, and which alternately discharges a fixed amount of hydraulic fluid in two groups, left and right, generated by this movement. . Conventionally, there has been no method for obtaining fixed discharge using a valve, and flow rate control has mainly been performed by adjusting continuous flow in an analog manner using a flow rate regulating valve. The present invention allows the flow rate to be controlled digitally by moving the plunger, that is, by accurately discharging an intermittent flow at a constant rate.

To explain the figure in detail, the main body (2) houses a plunger (2) with double ronds, and is sealed with rod covers (2) and (2) passing through both ronds of the plunger (2) via a seal.

A valve block (2) is attached to the main body (2), and a liquid passage bored in the block (2) is communicated with a liquid chamber created by the movement of the plunger (2).

In other words, the block ■ has three lands ■ and a spool ■■ (only the central land ■ has a slightly larger diameter).
It has a built-in body, and is sealed with a seal on both sides using a lid [phase] and ■ (the lid [phase] is made as shown in the figure due to construction). Spool groove 0 that slidably supports the spool ■ of the block ■
has seven liquid grooves 0, ■, ■, ■, 0, [phase], ■, among which liquid grooves [phase] and O are connected by a liquid path @, and an open groove ○, (2) leads to the main body (2), communicates with the liquid path (2), [phase], and opens into liquid chambers O, @, which are formed on the left and right sides of the plunger (2). The liquid grooves (2) and [phase] located outside the liquid groove 010 open from the liquid channels [phase] and [phase] to the discharge ports A and B via the check valves [Co., Ltd.] and (2). In addition, the thin liquid path ■, [phase] forms a pilot circuit, one end of which reaches the spool groove ■, and when the spool is switched, the liquid groove ■, ■ goes from the liquid groove ■ to the drain boat ■, and the other end connects to the liquid chamber O of the plunger ■, Open to ■. The rod covers (2) and (2) are provided with count detectors (2) and @, respectively, and the discharge amount is displayed by counting according to the left and right rows of the plunger.

Pressure liquid entering from the inlet port [phase] reaches the flow chamber [stock] through the liquid groove ■, the liquid path [phase], [phase], presses the plunger ■ to move it to the left, and this left movement causes the liquid to flow. A fixed amount of the working fluid in the chamber [phase] is discharged from the discharge port A through the liquid groove @, ■, and the liquid path ■ from the liquid path ■, ■, through the check valve, and at the same time, the rod end of the plunger ■. The number of ejections is displayed on the count detector when touched. The figure shows the state at this time. Since the droplet path ■ opens at the left-hand end of the plunger ■, the pressurized liquid ascends from the liquid chamber ■ through the droplet path [phase], enters the spool groove ■, presses the spool ■, and moves it to the right. Switch. By this switching, the pressure liquid enters the liquid chamber ■ from the liquid groove ■, via the liquid path 0 [phase], and moves the plunger ■ to the right, thereby moving the pressure liquid in the liquid chamber 0 to the liquid paths ■, ■, and the liquid groove ■
, .. A fixed amount is discharged from the discharge port B via the liquid path ■ and the check valve ■. Since the fine droplet path [phase] communicates with each other at the right-hand end of the granger ■, the pressure liquid ascends the fine droplet path [phase] and reaches the spool groove ■, suppressing the spool ■ and moving it to the left. These left and right rows are often performed automatically and consecutively. As mentioned above (in parentheses), the central land ■ of the spool ■ has a slightly larger diameter than the other lands ■, ■, so that the automatic lateralization of the spool ■ is performed smoothly.

The present invention, constructed and operated as described above, accurately quantifies continuous flow from the O]-artificial port.

Therefore, when used in connection with a hydraulic cylinder, the stroke of the hydraulic cylinder is quantified, and by controlling this count signal, the position of the hydraulic cylinder can be controlled.

(2) Although conventional flow rate control valves could not control minute inflows, the valve according to the present invention can be used even for minute inflows.

The mark is -1.The flow control valve required the addition of a compensator to reduce the effects of changes in pressure and temperature, but this is not necessary in the valve according to the present invention.

The valve having two discharge ports in the embodiment can be used as a flow rate dividing valve.

0, which is a metered discharge valve with the following characteristics.

[Brief explanation of the drawing]

The figure traverses the embodiment according to the present invention and shows the state of the plunger (2) at the end of the left row. Patent applicant Osaka Jatsuki Seisakusho 5

Claims (1)

[Claims] , a block ■ having a drain port O and an inlet port ○ is attached to the main body ■ which has a built-in plunger ■, a spool ■ having three lands is built into the spool groove 0 of the block ■, and a spool ■ having three lands is built into the spool groove O. There are 7 liquid grooves■,■,■
, ■, 0, ■, ■ are bored, and the outermost liquid groove 0.0 is connected to the liquid chamber @ formed by the plunger via the drain boat ■ and the thin liquid passage [phase], [phase]. It is opened at the stroke end of the granger of O, and the central liquid groove [phase] is connected to the inlet port O, and the liquid groove [phase] is formed on both sides sandwiching the liquid groove [phase]. is connected to the liquid chamber O [phase] via the liquid path [phase], and further to the liquid groove 0, ■ and ■,
[Phase] Forms a drip groove 0, ■ is a check valve [Phase],
(2) A fixed quantity discharge valve characterized in that the discharge valve is opened at A and B respectively.