JP2621321B2 - Fluid pressure regulating valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial application field The present invention is sent from a fluid pump to drive a fluid pressure actuator driven by a predetermined fluid pressure. The present invention relates to a fluid pressure adjusting valve device used for adjusting a pressure of a fluid to a predetermined value.

(2) Prior Art Conventionally, as this type of fluid pressure adjusting valve device, as shown in FIG. 3, a flap 03 pivotally supported by a support member 02 via a pivot pin 01 is illustrated. There is a configuration in which a drive means such as a torque motor or the like is used to swing by a predetermined angle so as to approach or move away from an opening 05 at the tip of a nozzle 04 connected to a fluid pump. Then, the gap between the flap 03 and the nozzle opening 05 is appropriately increased or decreased by the swing of the flap 03, the nozzle back pressure generated inside the nozzle 04 is adjusted to a predetermined magnitude, and the adjusted back pressure is reduced. It is sent to a fluid pressure actuator or the like via a back pressure extraction pipe 06 to drive it.

(3) Problems to be Solved by the Invention By the way, the flap is driven by a driving means such as a torque motor.
In the above-described conventional device configured to move the flap 03 closer to or away from the nozzle opening 05, the movement of the flap 03 must be delicately controlled. There is a problem that the structure is complicated. Further, since the device has a member pivotally supported by the pivot pin 01 such as the flap 03, the function of the device may be impaired by vibration or impact.

The present invention has been made in view of the above circumstances, has a simple structure, does not require much higher accuracy than conventional devices, and does not impair the function of the device even by vibration or impact, It is an object to provide the fluid pressure regulating valve device.

B. Configuration of the Invention (1) Means for Solving the Problems In order to solve the above problems, a fluid pressure regulating valve device of the present invention comprises a cylindrical case body having one end closed, and an opening of the case body. A diaphragm that covers and defines a sealed magnetic fluid storage portion inside the case body, a magnetic fluid sealed in the magnetic fluid storage portion, and a magnetic field generated in the magnetic fluid storage portion;
Magnetic field generating means for displacing the magnetic fluid in the magnetic fluid accommodating portion and displacing the surface of the diaphragm, and a nozzle arranged to face the diaphragm with an opening at a predetermined interval. It is characterized by that.

(2) Operation According to the above configuration, when a magnetic field is generated in the magnetic fluid storage unit by the magnetic field generation unit, the magnetic fluid is attracted to a predetermined location by the magnetic force of the magnetic field and is unevenly distributed in the storage unit, and the surface of the diaphragm is displaced. Is displaced, and the distance between the diaphragm and the nozzle opening increases or decreases. Therefore, the nozzle back pressure can be adjusted to a predetermined level by adjusting the amount of air passing through this interval by increasing or decreasing the interval.

(3) Embodiment Hereinafter, a fluid pressure regulating valve device according to the present invention will be described with reference to the drawings.
An embodiment in which the invention is applied to a pneumatic actuator driven by a predetermined air pressure or the like will be described.

First, a first embodiment of the present invention will be described with reference to FIGS. 1A and 1B. At one end (upper side in FIGS. 1A and 1B), a central part of a bottom surface 1a of an iron upper yoke 1 as a cylindrical case body closed. The iron core 2 forming one magnetic pole of the electromagnet is directed toward the inside of the upper yoke 1 (downward in FIGS. 1A and 1B).
It is formed integrally. A coil 3 whose both ends are connected to a power supply (not shown) is wound around the outer peripheral surface of the iron core 2. Rubber or the like is provided between the outer peripheral surface of the wound coil 3 and the inner peripheral surface of the upper yoke 1. The insulator 4 formed by the above is interposed.

At the open end of the upper yoke 1, a peripheral portion of a diaphragm 5 arranged at a slight distance from the tip of the iron core 2 is fixed, and the diaphragm 5 and the inner surface of the upper yoke 1 are magnetically fixed. A fluid container 6 is defined. A magnetic fluid 7 is sealed in the magnetic fluid container 6. The magnetic fluid 7 is a conventionally known magnetic fluid, and is formed by uniformly mixing and dispersing magnetic powder such as iron powder in a high-viscosity fluid. When no magnetic force is applied to the magnetic fluid, the magnetic fluid 7 is Is accommodated in the magnetic fluid accommodation portion 6 in a predetermined shape corresponding to the shape of the diaphragm,
When a magnetic force is applied, the magnetic force is attracted to a portion where the magnetic force is applied, so that the magnetic force can be unevenly distributed in the housing portion 6.

An opening end of a cylindrical lower yoke 8 having one end closed is fixed to an opening end of the upper yoke 1 via the diaphragm 5. A vent hole 9 communicating with the atmosphere is opened on the side surface of the lower yoke 8, and a nozzle 10 is provided at the center of the bottom surface 8a toward the inside of the lower yoke 8 (first A, 1A).
The nozzle 1 is formed integrally (upward in FIG.
The opening 11 at the leading end of the cylinder 0 faces the diaphragm 5 at a predetermined interval g. The nozzle 10 forms the other magnetic pole of the electromagnet, which forms a pair with the iron core 2. When a current flows through the coil 3, a magnetic path connecting the iron core 2, the upper yoke 1, the lower yoke 8, and the nozzle 10 is formed. Is formed, and a magnetic field is generated between the magnetic poles of the iron core 2 and the nozzle 10. And these iron cores 2, upper and lower yokes 1,
An electromagnet M as a magnetic field generating means is configured by the nozzle 10, the nozzle 10, and the coil 3.

On the lower surface of the lower yoke 8, a back pressure tube 12 having a back pressure chamber 12a communicating with the nozzle 10 is integrally formed, and the back pressure tube 12 is connected to an unillustrated air pressure feeding means.
A back pressure extraction pipe 13 branches from one side of the back pressure pipe 12, and the back pressure extraction pipe 13 is connected to a drive system such as a pneumatic actuator (not shown).

The apparatus according to this embodiment includes an upper yoke 1, a diaphragm 5, a nozzle 10, a back pressure tube 12, an electromagnet M, and the like.

Next, the operation of the first embodiment of the present invention having the above-described configuration will be described.

When the coil 3 is not energized, the magnetic fluid 7 is not unevenly distributed in the magnetic fluid container 6 as shown in FIG. 1A, so that a predetermined gap g is provided between the diaphragm 5 and the nozzle opening 11. Is open. In this case, even if high-pressure air is supplied to the nozzle 10 by the pneumatic transmitter, the amount of air injected from the interval g is large, so that only the pneumatic actuator or the like can be driven to the back pressure chamber 12a. The required back pressure cannot be obtained.

Next, when a switch (not shown) is input to energize the coil 3 from the power supply, the iron core 2, the upper yoke 1,
A magnetic path is formed in the lower yoke 8 and the nozzle 10 so that the core 2
And a magnetic field is generated between the nozzle 10. Thus, the magnetic fluid 7 is attracted to the magnetic force of the magnetic field and gathers near the tip of the iron core 2.
As a result, the magnetic fluid 7 is eccentrically located in the central portion in the magnetic fluid containing portion 6, and the central portion is in a swelling state, and the diaphragm 5 is displaced downward in the drawing. Therefore diaphragm 5
And narrows the spacing g ₀ between the nozzle opening 11, so that the amount of air injected from the gap g ₀ is squeezed, the back pressure chamber 12
The nozzle back pressure in a reaches a predetermined value. Then, the pneumatic actuator or the like can be driven by extracting the predetermined back pressure from the back pressure extraction pipe 13 and sending it to a drive system such as a pneumatic actuator.

As described above, in the apparatus according to the first embodiment having the above-described structure, the magnetic fluid 7 is unevenly distributed in the magnetic fluid storage unit 6 by the electromagnet M to adjust the gap g between the nozzle opening 11 and the diaphragm 5, thereby controlling the back pressure. Since the nozzle back pressure generated in the chamber 12a is adjusted, the gap between the flap and the nozzle opening is adjusted by moving the flap closer to or away from the nozzle opening by a torque motor as in the conventional device. Not only is the structure simpler than that which is configured so that it is not necessary, but there is no need to perform delicate control of the flap, and therefore, high precision is not required. Further, the device of this embodiment does not have a member such as a flap pivotally supported by a pivot pin and is weak against vibration and impact, and therefore has high durability.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2A and 2B. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

The device of the second embodiment differs from the device of the first embodiment in that the magnetic fluid 7 is unevenly distributed in the center of the magnetic fluid container 6 so that the center of the diaphragm 5 is expanded. The magnetic fluid 7 differs from the device of the first embodiment in that the magnetic fluid 7 is unevenly distributed in the peripheral portion of the magnetic fluid accommodating portion 6 'so that the center of the diaphragm 5' is depressed.

That is, the upper yoke 1 'is formed in a cylindrical shape with one end closed, and a gate-shaped iron core 2' having a pair of legs 2'a, 2'a is disposed inside the upper yoke 1 '. Both legs 2'a of the core 2 ',
A coil 3 'is wound around a connecting portion 2'b connecting the 2'a, and an insulator 4' is interposed between the iron core 2 'and the inner peripheral surface of the upper yoke 1'. An electromagnet M 'as a magnetic field generating means is formed by the coil 3' and the iron core 2 '.
And by energizing the coil 3 ',
A magnetic field is generated at the ends of both legs 2'a, 2'a of the iron core 2 '. The diaphragm 5 'is arranged at a slight distance from the tip of both legs 2'a, 2'a of the iron core 2', and the periphery of the diaphragm 5 'is fixed to the open end surface of the upper yoke 1'. Have been.

Next, the operation of the second embodiment having the above configuration will be described.

First, when the coil 3 'is not energized, as shown in FIG. 2A, the magnetic fluid 7 is not unevenly distributed in the magnetic fluid accommodating portion 6' and a predetermined space is provided between the diaphragm 5 'and the nozzle opening 11. The interval g 'is open. And in this case, when high-pressure air is supplied to the nozzle 10 from the air compressor,
Since the amount of air injected from the interval g 'is smaller, a nozzle back pressure of a predetermined size or more is generated in the back pressure chamber 12a.

Next, when a switch (not shown) is input to energize the coil 3 'from the power source, a magnetic field is generated at the tips of both legs 2'a and 2'a of the iron core 2', and the magnetic fluid 7 is attracted to the magnetic force of the magnetic field. And gather near the tips of the two legs 2'a, 2'a. As a result, the magnetic fluid 7 is unevenly distributed in the peripheral portion in the magnetic fluid containing portion 6 ', and the central portion is depressed. Thus the diaphragm 5 'is displaced as lifting of the upper in the vicinity of the center in FIG. As shown in FIG. 2B, the diaphragm 5' to the spacing g between the nozzle opening 11 'so that ₀ increases, the gap g' _The amount of air injected from ₀ increases, and the nozzle back pressure in the back pressure chamber 12a decreases to reach a predetermined magnitude. Therefore,
The pneumatic actuator or the like can be driven by the predetermined back pressure. The same effect as that of the device of the first embodiment can be obtained by the device of the second embodiment having the above configuration.

As described above, the embodiments of the fluid pressure adjusting valve device according to the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the present invention described in the appended claims. It is possible to make small design changes.

For example, the magnitude of the magnetic force of the magnetic field may be changed by appropriately changing the amount of current supplied to the coil, and the distance between the diaphragm and the nozzle opening may be freely adjusted. The apparatus can adjust the magnitude of the nozzle back pressure to a desired level, and can drive various hydraulic actuators.

Further, in the above embodiment, an example in which the device is operated by air pressure is shown, but the invention is not limited to this, and the device may be operated by hydraulic pressure or water pressure.

C. Effects of the Invention As described above, the fluid pressure regulating valve device of the present invention comprises a cylindrical case body having one end closed, and a hermetically sealed magnetic fluid housing inside the case body covering the opening of the case body. A diaphragm defining a portion, a magnetic fluid sealed in the magnetic fluid storage portion, a magnetic field generated in the magnetic fluid storage portion, and the magnetic fluid is unevenly distributed in the magnetic fluid storage portion to displace the surface of the diaphragm. Since it is composed of a magnetic field generating means capable of generating the magnetic field, and a nozzle disposed so as to oppose an opening to the diaphragm at a predetermined interval, the structure is simpler than that of the conventional device, and the accuracy is so high. Is not required, and its function is not likely to be impaired by vibration or impact.

[Brief description of the drawings]

1A and 1B show a first embodiment of a fluid pressure regulating valve device according to the present invention. FIG. 1A is a longitudinal sectional view of the device in an inactive state, and FIG. Vertical sectional view of the
2A and 2B show a second embodiment of the fluid pressure regulating valve device according to the present invention. FIG. 2A is a longitudinal sectional view of the device in an inactive state, and FIG. Longitudinal section, third
The figure is a longitudinal sectional view of a conventional device. M, M ': an electromagnet as a magnetic field generating means, 1, 1': an upper yoke as a cylindrical case body, 5, 5 '... a diaphragm, 6, 6' ... a magnetic fluid accommodating section, 7 ... Magnetic fluid, 10…
… Nozzle, 11 …… Opening

Claims (1)

(57) [Claims] 1. A cylindrical case body having one end closed, a diaphragm covering an opening of the case body to define a sealed magnetic fluid storage portion inside the case body, and sealed in the magnetic fluid storage portion. A magnetic fluid to be generated, a magnetic field generating means for generating a magnetic field in the magnetic fluid containing portion, and displacing the magnetic fluid in the magnetic fluid containing portion to displace the surface of the diaphragm,
A fluid pressure regulating valve device comprising: a nozzle disposed to face an opening of the diaphragm at a predetermined interval.