JPS6224082A - Fluid control valve - Google Patents

Abstract

PURPOSE:To drive and control a valve plug even with a small driving section and finely control the displacement of the valve plug by driving the valve plug with the reduced driving displacement quantity of the driving section and the increased driving force respectively. CONSTITUTION:The motor rod 3a of a linear pulse motor 3 is digitally moved downward step by step based on control pulse signals to press and drive a small-diameter piston 7. Then, a large-diameter piston 8 is likewise moved downward via the operating oil in an operating chamber 6. In this case, the displacement quantity of the large-diameter piston 8 is reduced than that of the small-diameter piston 7, and the driving force is increased than that of the small-diameter piston 7. Accordingly, the large-diameter piston 8 presses and drives a poppet valve 14 with the reduced displacement quantity of the motor rod 3a and the increased driving force.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a fluid control valve, and more particularly to a fluid control valve whose valve body is driven by a linear pulse motor, a solenoid, or the like.

(Prior Art) A valve whose valve body is driven by a solenoid is often used as a control element for hydraulic equipment. For example, as shown in FIG. 3, a poppet valve 33, which is arranged so as to be movable up and down with respect to an intermediate sleeve 32 of a main body 31, is always urged upward by a coil spring 34, and is attached to the upper part of the main body 1. It is designed to be directly driven by a solenoid 35.

That is, when the solenoid 35 is excited, the plunger 36 of the solenoid 35 is attracted to the stator 38 of the solenoid 35 against the biasing force of the coil spring 34.
The poppet valve 33 is displaced via a bushing pin 37.

Further, when the solenoid 35 is demagnetized, the poppet 1-valve 33 is moved back by the biasing force of the coil spring 34.

In addition, in FIG. 3, 39 is the coil of the solenoid 35, and 40 is the coil of the solenoid 35.
is a spring that urges the plunger 36 in the suction direction.

(Problems to be Solved by the Invention) Although the control valve in which the poppet valve 33 is directly driven by the solenoid 35 as described above requires a large force during its operation, a small amount of displacement of the valve 33 to the poppet 1 is expected. That was difficult.

The present invention has been made in order to solve the above-mentioned problems, and provides a fluid control valve that enables minute control of the displacement of a valve body and that can also be driven and controlled even by a drive section with a small thrust. It is an object.

Structure of the Invention (Means for Solving Problems) The fluid control valve of the present invention has a working chamber formed between a driving body with a small cross-sectional area and a driven body with a large cross-sectional area, which are driven by a driving part. A valve body is provided on the side of the non-actuating chamber of the driven body, which is operated by the driven body and expands and contracts the oil passage.

(Function) With the above configuration, when the drive section drives the drive body, the driven body is pressed and driven via the fluid in the working chamber, thereby operating the valve body. At this time, the amount of displacement of the valve body is smaller than the drive stroke amount of the drive section, and the force transmitted to the valve body is made larger than the force output from the drive section.

(Example) An example embodying this invention will be described below with reference to FIGS. 1 and 2.
This will be explained according to the diagram.

A linear pulse motor 3 as a drive unit is fixed to the upper part of the main body 1 via a bracket 2 (X).

The linear pulse motor 3 is driven and controlled by a control pulse signal from a control device 22 as shown in FIG.
The motor rod 3a is digitally driven in steps by control pulse signals appropriately outputted from the motor rod 22.

Corresponding to the linear pulse motor 3, an operating chamber 6 is formed in the upper part of the main body, the upper and lower parts of which are each composed of a small chamber 4 and a graduate chamber 5. In the small chamber 4, a small-diameter piston 7 as a driving body with a small cross-sectional area is disposed so as to be slidable in the vertical direction, and in the large chamber 5, a large-diameter piston 8 as a driven body with a large cross-sectional area is similarly arranged. The working chamber 6, which is arranged to be slidable in the vertical direction and is surrounded by both pistons 7 and 8, is sealed with fluid such as hydraulic oil.

A working chamber 6 consisting of the small chamber 4 and the large space 5. The small diameter piston 7 and the large diameter piston 8 constitute a hydraulic booster mechanism A.

The motor rod 3a of the pulse motor 3 is brought into contact with the upper surface of the small diameter piston 7, and presses the small diameter piston 7 via the motor rod 3a when the linear pulse motor 3 is driven. A valve hole 9 is formed below the working chamber 6 in the main body 1, and the lower part of the large diameter piston 8 protrudes from the inner portion of the valve hole 9.

A sleeve 10 is disposed below the valve hole 9, and the main body 1
An oil passage 11 provided in the sleeve 10 communicates with an oil passage 13 also provided in the main body 1 via an oil passage 12 provided in the sleeve 10 and a valve hole 9. A poppet valve 14 serving as a valve body is disposed in the sleeve 10 so as to be slidable in the vertical direction by a guide portion 140 provided at a lower portion of the poppet valve 14 .

The poppet valve 14 has an upper end surface that is connected to the large diameter piston 8.
A tapered seat surface 1 is arranged in contact with the lower part of the seat and is provided between the upper part and the small diameter part on the center side.
6 comes into contact with and separates from the valve seat 15, which is provided at the upper opening of the sleeve 10 and expands outward, so that the hydraulic oil (i.e., the amount of fluid) flows into the oil passages 11, 12, 13.
is designed to be controlled.

A coil spring 18 is interposed between the lower part of the poppet valve 14 and the lower end cap 17 of the main body 1, and constantly urges the poppet valve 14 upward.

An oil passage 19 is connected between the working chamber 6 and the oil passage 13, and a check valve 2 equipped with a spring 20 is connected to the oil passage 19.
1 is provided. Note that 21a is a set screw for fixing and sealing the check valve 21 within the oil passage 19.

The oil passage 19 is used to release hydraulic oil from the oil passage 13 when the fluid sealed in the working chamber 6 leaks to the outside due to long-term use, and the fluid in the working chamber 6 becomes less than the required amount. The check valve 21 is for preventing the fluid stored in the working chamber 6 from leaking to the oil passage 13 side.

The operation of the fluid control valve configured as above will be explained.

Now, when the control device 22 outputs an appropriate control pulse signal, the linear pulse motor 3
Based on the control pulse signal, the motor rod 3a is digitally moved forward and downward, thereby suppressing and driving the small diameter screws 1 to 7. Then, the large diameter screw 1-8 is similarly moved via the hydraulic oil in the operation chamber 6.

At this point, the amount of displacement of the large diameter piston 8 is equal to the amount of displacement of the small diameter piston 7.
The displacement of the small-diameter piston 7 is reduced in proportion to the area of the large-diameter piston 80/the area of the large-diameter piston 80.

Further, the driving force of the large diameter piston 8 is increased compared to the driving force of the small diameter piston 7 in proportion to the area of the large diameter piston 8/the area of the small diameter piston 7.

In this way, the large diameter screws 1 to 8 push and drive the poppet valve 14 while the displacement amount and driving force of the motor rod 3a are reduced and increased, respectively. Then, the poppet valve 14
moves its seat surface 16 closer to the valve seat 15 against the biasing force of the coil spring 18.

In this case, the controller 22 controls the linear pulse motor.
When the control pulse signal outputted to valve 3 is a signal indicating full opening, the poppet valve 14 moves its seat surface 16 to the valve seat 1.
5 and completely closes the oil passage 12. For example, when the control pulse signal output from the control device 22 to the linear pulse motor 3 is a signal indicating half-open, the valves 1 to 14 stop their seat surfaces 16 at the half-open position.

Next, when the control device 22 outputs a control pulse signal meaning fully open to the linear pulse motor 3 while the opening degree of the poppet valve 14 is kept constant as described above, the linear pulse motor 3 The motor rod 3a is moved upward. Then, since the pressing force on the poppet valve 14 is released, the poppet valve 14 is moved by the coil spring 18.
It returns upward to the fully open position due to the urging force of .

In this way, the amount of displacement of the poppet valve 14 can be arbitrarily set in response to the control pulse signal from the control device 22. In other words, when a solenoid is used in the drive part, the solenoid is excited and deenergized only by on/off control, and in this case, the poppet valve 14 has only two stroke positions, fully closed and fully open. The linear pulse motor 3 can arbitrarily control the opening degree of the poppet valve 14 digitally, and as a result, the amount of hydraulic oil flowing through the oil passages 11, 12, and 13 can be arbitrarily controlled. At the same time, the occurrence of pulsations in the oil passages on the supply side and output side of the hydraulic oil can be greatly suppressed.

Furthermore, the opening degree of the poppet valve 14 is determined by the linear pulse motor 3.
By using this, it is possible to improve accuracy and reduce hysteresis when opening and closing.

In addition, the amount of displacement of the motor rod 3a of the linear pulse motor 3 is reduced by passing through the hydraulic booster mechanism A, so the amount of displacement of the poppet valve 14 can be reduced, and therefore fine control is possible.

Furthermore, in this embodiment, a linear pulse motor 3, which generally has a small driving force, is used as the drive unit of the poppet valve 14, but the motor rod 3a of the linear pulse motor 3 is
Since the driving force is amplified by the hydraulic booster mechanism A, the driving force necessary for driving the poppet valve 14 can be sufficiently provided. Furthermore, since the linear pulse motor 3 is used, the microcomputer control power of the fluid control device becomes easier (and when this fluid control valve is systemized, the response to the control pulse signal output from the control device 22 is quick. There is an advantage.

Note that this invention is not limited to the above embodiments, but
For example, in the configuration of the above embodiment, the linear pulse motor as the drive unit may be replaced with a proportional solenoid, the valve body may be a normally closed type, and the valve body may be replaced with a valve body other than a poppet valve, for example. It is also possible to make arbitrary changes, such as changing to a spool valve or a rotary valve, without departing from the spirit of the invention.

Effects of the Invention As detailed above, this invention drives the valve body by reducing and increasing the drive displacement and driving force of the drive unit, respectively, so even if the drive unit has a small thrust, the valve body can be driven. This invention is excellent for industrial use because it has the effect of being able to control the displacement of the valve body and also to enable minute control of the displacement of the valve body.

[Brief explanation of the drawing]

Figure M1 shows a cross section of an embodiment embodying the present invention; 1 is a main body; 3 is a linear pulse motor; 14 is a small chamber; 5 is a large chamber;
is a working chamber, 7 is a small diameter piston, 8 is a large diameter piston, 9 is a valve hole, 10 is a sleeve, 11.12.13 is an oil passage, 14
15 is a poppet valve, 15 is a valve seat, 16 is a seat surface, 18 is a coil spring, 21 is a check valve, and 22 is a control device. Patent applicant: Toyoda Automatic Machinery Machinery Co., Ltd. Agent: Patent attorney On 1) Hironobu Figure 1

Claims (3)

[Claims] 1. A fluid is sealed in a working chamber formed between a driving body with a small cross-sectional area and a driven body with a large cross-sectional area driven by the driving part, and a reaction chamber side of the driven body is operated by the driven body. A fluid control valve equipped with a valve body that expands and contracts the oil passage. 2. The fluid control valve according to claim 1, wherein the drive section is a linear pulse motor. 3. Claim 1, wherein the drive unit is a solenoid.
The fluid control valve described in section.