JPS62288778A - Hydraulic control valve - Google Patents

Abstract

PURPOSE:To improve the accuracy of flow control by providing means for regulating the position of a stopper being arranged separately from a valve seat in the opening/closing direction. CONSTITUTION:A poppet valve 3 moves between a position for closing a valve seat 15 arranged at the lower portion of an intermediate sleeve 2 and an open position where it is stopped by a stopper 14. The stopper 14 formed into a ring so as to be engagable with the top portion of the poppet valve 3 is secured to a piezoeleotric element 13. When the maximum voltage is applied from a control circuit to the piezoelectric element, the stopper 14 is moved to a position where the stroke D is minimized. Since the opening area and the open time can be adjusted simultaneously, micro flow can be controlled accurately.

Description

[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) This invention relates to a fluid control valve.

(Prior Art) A conventional fluid control valve is configured as shown in FIG. 4, for example. That is, the poppet valve 33 is arranged so as to be slidable in the vertical direction with respect to the intermediate sleeve 32 of the valve body 31. The poppet valve 33 has a return spring 3/I arranged below.
The valve body 31 is always biased upward and is directly driven by a solenoid 35 mounted on the upper part of the valve body 31. Further, a stopper 39 is disposed between the lower end of the intermediate sleeve 32 and a locking step 38 provided at the lower part of the oil passage 31a of the valve body 31, and the valve 33 is connected to the valve 1 which is driven to open relative to the stopper 39. The top of the valve can be locked.

When the solenoid 35 is energized, the first flange 1736 moves against the biasing force of the return spring 34.
5, and the poppet valve 33 is displaced in the opening direction via the bushing rod 36a. The poppet valve 33, which is in the open position EM, is driven through the bushing rod 36a until it reaches the open position where it is stopped by the stopper 39.

Further, when the solenoid 35 is demagnetized, the poppet valve 33 is moved toward the intermediate sleeve 3 by the biasing force of the return spring 34.
The valve seat 4o provided at the lower end of the valve 2 is closed.

The fluid R and II control valves configured as described above are
When the valve 33 is driven to open, the valve opening area is determined by the stroke D of the valve 33, and this stroke D is the distance from the top of the valve 33 to the stopper 39. is defined as

(Problems to be Solved by the Invention) In the above-described fluid control valve, the poppet valve 3 serves as a valve body.
Since the opening area of valve 3 is constant and the flow cannot be adjusted when valves 1 to 33 are open, the flow rate has been adjusted only by controlling the valve opening time. For this reason, the following problems remained: (1) the flow rate control range was narrow, (2) the flow rate control accuracy was poor, and (2) the pressure vibration was large.

(Object of the Invention) This invention was made to solve the above-mentioned problems, and since the opening area of the valve can be adjusted, the capacity of the same valve can be changed, improving the accuracy of flow control. The purpose of the present invention is to provide a fluid control valve that can perform the following steps.

(Means for Solving the Problems) The fluid syringe control valve of the present invention has an open position in which the valve seat is opened;
A valve body that opens and closes a flow path by being caught in a stopper that is spaced from a valve seat and moves between an open position and an open position that is locked against a stopper that is spaced from a valve seat; a drive unit that drives the valve body to open and close; It is equipped with a 1m fi1 position adjustment means for adjusting the arrangement position in the opening/closing direction.

(Function) With the above configuration, when the stopper arrangement position is set by the opening position adjustment means, the valve body driven in the opening direction by the drive unit is at the set opening position, and the opening is stopped by the stopper. state.

(First Embodiment) Hereinafter, an example of an actual FF1 embodying the present invention will be described with reference to FIG.

The valve body 1, which is formed in the shape of a right bottom part, has an inlet 1b formed on the outer circumferential surface of the center part and an outlet 1c formed on the lower circumferential surface, which communicate with the oil 181a provided inside the valve. Body'1
The middle sleeve 2 is S! The intermediate sleeve 2 has a poppet valve 3 as a valve body that can move vertically.
is located. Further, stone-shaped cylindrical screws 1 to 4 are arranged at the upper end of the intermediate sleeve 2, and are tightened together with the intermediate sleeve 2 to the valve body 1 by a coil plug 5 screwed onto the upper end of the valve body 1. It is fixed and the three parties are arranged densely.

A stator 7 is installed in the lower part of the piston sleeve 4, and a plunger 8 is arranged in the upper part to be movable up and down. A bushing rod 9 is provided at the lower part of the plunger 8 and passes through the stator 7 in the vertical direction.
It is in contact with the upper part of the poppet valve 3. Also, screw 1
A coil spring 10 is disposed between the inner curved surface of the sleeve 4 and the plunger 8, and presses the plunger 8 downward.
J9A, so that the bushing rod 9 is always in contact with the upper ends of the poppets 1 to 3. The coil plug 5
A coil 11 is installed between the inner circumferential surface of substantially the lower half of the piston sleeve 4 and the outer circumferential surface of the piston sleeve 4 .

the piston sleeve 4, the coil plug 5, the stator 7,
The plunger +78, the bushing rod 9, the coil spring 10, and the coil 11 constitute a driving portion Δ.

A return spring 12 is disposed between the valve top of the valve f'3 and the bottom 81 of the oil passage 1a, so as to always bias the valve 3 in the opening direction. A plurality of ring-shaped piezoelectric cables 13 as open position adjusting means are fixedly attached to the upper part of the lower end surface of the oil passage 1a of the main body 1 so as to surround the return spring 12 in a stacked state using adhesive blades. Further, a stopper 14 formed in a ring shape and capable of being latched onto the valve top of the poppet valve 3 is fixed to the piezoelectric cord 13 at the upper portion thereof by a method such as adhesion.

The piezoelectric cord 13 is driven by a control voltage applied from a control circuit (not shown). That is, when the maximum electric power is applied to the piezoelectric cable 13 from the control circuit, the stopper 14
is driven by the piezoelectric element 13 and moved to position ■ to minimize the stroke D, and υJl! When the control i1 voltage is not applied from one circuit (in the case of no voltage), it is arranged at a position that maximizes the distance D.

Therefore, the poppet valve 3 moves between a closed position in which the valve seat 15 provided at the lower part of the intermediate sleeve 2 is closed and an open position in which it is locked by the stopper.

゛The intermediate sleeve 2, the poppet valve 3, the return spring 12,
The valve part B is constituted by the spring 1, the collar 14, and the piezoelectric cord 13.

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

Now, in FIG. 1, the coil 11 of the drive section A is in a non-excited state, and at this time, the poppet valve 3 is located at the closing position where the valve seat 15 is closed due to the biasing force of the return spring 12.

Therefore, fluid such as oil from the inlet 1b is stopped at the valve seat 15. Further, in FIG. 1, the piezoelectric element 13 is in a no-voltage state where no voltage is applied. This state C
When the coil 11 of the drive section A is excited, the plunger t8 is attracted to the stator 7 and the bushing rod 9 is driven to open the poppet valve 3 against the urging force of the return spring 12. ,
The poppet valve 3 that is driven to open has a maximum stroke Q wa
After moving x, it is stopped by the stopper 14 and held at the open position.

When the poppet valve 3 is held open in this manner, the opening area of the valve is maximized, and the fluid flowing in from the inlet 1b flows out from the outlet 1C via the oil passage 1a. In this state, when the maximum control voltage is applied from the control circuit to the piezoelectric cable 13, the piezoelectric cable 13 resists the pressing force of the plunger 8 (adsorption force by the stator 7) and moves the stopper 14 to the minimum stroke ( ). As a result, the frontage area of the valve becomes minimum, and the fluid flowing through the oil passage is controlled by LIJ. Note that the control voltage L[
When the voltage is set to an arbitrary voltage value smaller than the maximum voltage, the piezoelectric element 13 moves the stopper 14 to a position corresponding to the voltage value.

When the coil 11 of the drive unit A is turned off, the pressing force of the plunger 8 is released. The valve seat 15 returns to the open position and opens the valve seat 15.

Incidentally, in the above explanation] before the coil 11 is excited, no voltage is applied to the piezoelectric element 13, but before the coil 1 is excited, a predetermined frontage area of 176 A control voltage may be applied to the piezoelectric cord 13 in order to set the value to .

By changing the control voltage applied to the piezoelectric element 13 in this way, the opening area can be arbitrarily controlled, and by controlling the excitation time of the coil 11, the opening time of the poppet valve can be arbitrarily controlled. Can be controlled.

Therefore, no voltage is applied to the piezoelectric cord 13, and the stroke D
If the opening time is controlled while the opening area is maximized (in other words, the frontage area is maximized), human flow cooling control becomes possible. On the other hand, if the opening time is similarly controlled by 6+1 while the stroke D is minimized (the opening area is minimized), highly accurate control of minute amounts becomes possible. In addition, since the frontage area and the frontage time can be adjusted and controlled at the same time, it is possible to accurately control minute flow rates, and
Large capacity valves can be realized. This also enables high-speed driving of the plunger and soft start/stub.

Further, by controlling the opening area to be small at the beginning of the outflow of the controlled flow rate and increasing the opening area at the latter stage of the outflow, pressure vibrations can be reduced and rumors can be spread.

(Second Embodiment) In the second embodiment shown in FIG. 2, the piezoelectric element 13 of the first embodiment is
A linear stepping Tanabata 20 is disposed at the lower end of the valve body 1 instead of the screw 1 to the collar 14, and the screw 1 is displaced in the axial direction by the linear stepping motor 20. A foot 21 is arranged. The screw shaft 21 is arranged so as to be able to lock onto the valve top of the poppet valve 3 with its tip as a stopper. The stepping motor 20 and the screw shaft 21 constitute an open position adjusting means.

In this embodiment, the speed of change of the frontage area is slower than that of the fluid control valve of the first embodiment, but after the opening area is set, the screw shaft 21 does not need to be supplied with control power because of the structure of the screw shaft 21. Since the shaft 21 is held at the set position, there is no need to supply power to the stepping motor. Further, there is an advantage that the stepping motor 20 can be driven with a lower voltage than the piezoelectric element 13 of the first embodiment, and the cost can be reduced.

(Third Embodiment) In the third practical example shown in FIG. A threaded bolt 23 serving as an open position control means is screwed in through 22 so as to be adjustable in forward and backward movement. The threaded bolt 23 is arranged so as to be able to lock onto the valve top of the poppet valve 3 with its tip as a stopper.

Although it is difficult to change the opening area during fluid control in this embodiment, it is possible to set the opening area to any desired opening area when changing the valve capacity of this fluid control valve built-in system. Control power for is not required.

Note that this invention is not limited to the above embodiments, but
In the first to third embodiments, the poppet 2-way valve is embodied, but it is not limited to this, and it can be embodied in a diball type or 3,4000 valve, etc., and other changes may be made to the extent that it does not depart from the spirit of the invention. It is also possible to do so.

(Effects of the Invention) As detailed above, in this invention, since the opening area of the valve can be adjusted, the function of the valve can be changed with the same valve, and there is no need to create a series of valves for each application. Various types of valves can be used, reducing product costs. Moreover, not only can the flow rate control range be changed, but also the flow rate can be changed.
This invention has an excellent effect of improving control accuracy and further reducing pressure sensing, making it an excellent invention for industrial use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a fluid control valve of a first embodiment embodying the present invention, FIG. 2 is a sectional view of a fluid control valve of a second embodiment,
FIG. 3 is a sectional view of a fluid control valve according to a third embodiment, and FIG. 4 is a sectional view of a conventional fluid control valve. 1 is the valve body, 3 is the poppet valve (valve body), 13 is the piezoelectric element, 14 is the stopper, 20 is the stepping seventh, 21 is the screw shaft, 22 is the threaded bolt, A is the drive part, B is the valve part It is.

Claims (1)

[Claims] 1. The flow path is opened and closed by moving between a closed position where the valve seat is closed and an open position where the valve seat is locked to a stopper located apart from the valve seat. A fluid control valve comprising a valve body, a drive unit that drives the valve body to open and close, and an open position adjusting means that adjusts the position of the stopper in the opening and closing directions. 2. The opening position adjusting means is a piezoelectric element provided on the side opposite to the locking side of the stopper, and the arrangement position of the stopper is adjusted by applying a control voltage to the piezoelectric element. The fluid control valve according to item 1. 3. The opening position adjusting means is constituted by a screw shaft having a tip portion serving as a stopper, and a linear stepping motor that drives and adjusts the locking position of the screw shaft with respect to the valve body. The fluid control valve according to scope 1. 4. The fluid control valve according to claim 1, wherein the opening position adjusting means is an opening position adjusting member that is provided with a tip portion as a stopper and is screwed into the valve body so as to be movable forward and backward.