JP2014194252A - Energizing force variable valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energizing force variable valve device capable of substantially changing a spring force by virtue of an action of magnetic viscous fluid, in the valve device in which a valve body is energized with respect to a valve seat by the spring force.SOLUTION: In an energizing force variable valve device 1, a valve body 2 is pressed by a spring 3 onto a valve seat 4. The valve body 2 is bonded to one edge of a plunger 6 made of iron, and the plunger 6 is received to an energizing force adjusting mechanism 5 freely movably in the axial direction. The energizing force adjusting mechanism 5 includes a casing 7 which air-tightly receives plunger 6, a yoke 8 disposed so as to surround the outer circumference of the plunger 6 and a solenoid 9 for magnetizing the yoke 8 which is disposed within the casing 7, a fluid chamber 10 formed between the outer circumference of the plunger 6 and the yoke 8, and a magnetic viscous fluid 11 filled into the fluid chamber 10. By changing electric current caused to flow through the solenoid 9, viscous resistance with respect to the movement of the plunger 6 is increased and decreased and apparent spring force is made variable.

Description

  The present invention relates to a valve device in which a valve body is urged against a valve seat by a spring force, and the spring force can be substantially changed by the action of a magnetorheological fluid.

2. Description of the Related Art Conventionally, as a regulating valve used in hydraulic equipment, a type that urges a valve body toward a valve seat with a spring is known. In this adjusting valve device, the flow rate of the fluid is adjusted by the spring force inherent to the biasing spring.
On the other hand, what was described in patent document 1 is known as an electromagnetic valve using a magnetic fluid. This solenoid valve is a solenoid valve that performs switching operation of the flow path by a solenoid, and suppresses the adsorption speed of both iron cores, which cause wear and collision noise between the movable iron core and the fixed iron core, and the movable iron core and the magnetic plate. The magnetic resistance due to the magnetic path gap between the magnetic plate and the solenoid is reduced, and the solenoid is designed to save power. The gap between the magnetic plate and the movable iron core is filled with magnetic fluid and magnetic The frame is provided with magnetism necessary for holding the magnetic fluid.

JP 2000-130632 A

In an adjustment valve of a type in which the valve body is urged to the valve seat side by a spring, the characteristic is determined by the characteristic of the spring. Therefore, the characteristic of the valve cannot be changed unless the spring is changed.
The solenoid valve using the magnetic fluid has only ON / OFF operation regardless of the magnitude of the current applied to the solenoid.
The present invention provides a valve device in which a valve body is urged against a valve seat by a spring force, which can substantially change the spring force by the action of a magnetorheological fluid. It is aimed.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In the biasing force variable valve device 1 of the present invention for solving the above-described problem, the valve body 2 is pressed against the valve seat 4 by a spring force. The valve body 2 is coupled to one end of an iron plunger 6, and this plunger 6 is received by the biasing force adjusting mechanism 5 so as to be movable in the axial direction. The biasing force adjusting mechanism 5 includes a casing 7 that receives the plunger 6 in an airtight manner, a yoke 8 that is provided in the casing 7 so as to surround the outer periphery of the plunger 6, a solenoid 9 that magnetizes the yoke 8, and an outer periphery of the plunger 6. A fluid chamber 10 formed between the yoke 8 and a magnetorheological fluid 11 filled in the fluid chamber 10 is provided. When the magnetic powder scattered in the magnetorheological fluid is aligned in the magnetic field direction by the magnetic field of the solenoid 9, a magnetic powder cluster is formed. Along with the movement of the plunger 6, a viscous resistance due to the shear stress of the magnetic powder cluster is generated, and a moving load is generated in a direction that prevents the movement of the plunger 6. By changing the current flowing to the solenoid 9, the viscous resistance to the movement of the plunger 6 is increased or decreased to make the apparent spring force variable.

  The biasing force variable valve of the present invention can easily and accurately adjust the apparent spring force of the spring that biases the valve body by increasing or decreasing the viscosity resistance of the magnetorheological fluid by changing the current flowing to the solenoid.

It is a schematic explanatory drawing of the urging | biasing force variable valve which concerns on this invention. It is sectional drawing of embodiment of the urging | biasing force variable valve of FIG. It is sectional drawing of other embodiment of the urging | biasing force variable valve of FIG.

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the valve body 2 in the biasing force variable valve device 1 is biased against the valve seat 4 by a spring 3. The valve body 2 is coupled to one end of a plunger 6 made of a magnetic material, and the plunger 6 is received by the biasing force adjusting mechanism 5 so as to be movable in the axial direction.

  The urging force adjusting mechanism 5 includes a casing 7 made of a magnetic material that receives the plunger 6 in an airtight manner, a yoke 8 provided so as to surround the outer periphery of the plunger 6 in the casing 7, and a solenoid 9 that magnetizes the yoke 8. To do. A fluid chamber 10 is formed between the outer periphery of the plunger 6 and the yoke 8, and the fluid chamber 10 is filled with the magnetorheological fluid 11. When a current is passed through the solenoid 9, a magnetic field is generated as shown by an arrow, and the magnetic powder scattered in the magnetorheological fluid 11 is aligned in the magnetic field direction by this magnetic field, thereby forming a magnetic powder cluster. When the plunger 6 moves with respect to the casing 7, the shear stress of the magnetic powder cluster becomes viscous resistance, and a load in a direction that prevents the plunger 6 from moving is generated. By changing the current flowing to the solenoid 9, the viscosity of the magnetorheological fluid 11 can be changed to increase or decrease the resistance against movement of the plunger 6. Thereby, the apparent spring force is changed.

  In the embodiment shown in FIG. 2, the valve device 1 includes a substantially cylindrical valve case 12 that houses the valve body 2, a substantially cylindrical casing 7 that constitutes the biasing force adjusting mechanism 5, and a spring receiving cylinder 13. To do. The valve case 12 includes an outer case 121 and an inner case 122, which is hermetically fixed to the cylinder cover 101 of the hydraulic device on one end side and connected to one end side of the casing 7 on the other end side. The spring receiving cylinder 13 is connected to the other end side of the casing 7.

  The outer case 121 of the valve case 12 has a first port 121a that communicates with the oil passage 102 of the cylinder cover 101 on one end side, and the oil supply pipes 14 and 15 are connected to an intermediate portion.

  The inner case 122 is fitted in the outer case 121 in an airtight manner, and can be extracted from the other end side of the outer case 121. The valve seat 4 is airtightly fitted to one end side of the inner case 122 so as to face the first port 121a, and is prevented from coming off to one end side by a retaining ring 16. In the middle part of the inner case 122, second and third ports 121b and 121c communicating with the oil feeding pipes 14 and 15 are provided. The valve body 2 is inserted into the valve chamber 17 formed inside the inner case 122. The valve body 2 is urged against the valve seat 4 by the spring 3 through the plunger 6 so as to close the port 121a.

  The casing 7 of the urging force adjusting mechanism 5 includes a cylindrical cylinder 71 made of a magnetic material, cylinder covers 72 and 73 that hermetically close both ends, and rod covers 74 and 75 that are hermetically fixed to the outside thereof. To do. Reference numeral 23 denotes a sliding bush, and 24 denotes a sealing element such as a sealing material. The cylinder covers 72 and 73 have oil supply ports 72a and 73a for supplying the magnetorheological fluid 11, respectively. The oil filler ports 72a and 73a are closed by steel balls 72b and 73b and bolts 72c and 73c. The rod cover 74 on one end side is fixed to the connection flange 18 with a bolt, and the connection flange 18 is fixed to the outer case 121 with a bolt (not shown).

  Plunger 6 penetrates rod covers 74 and 75 and cylinder covers 72 and 73 on one end side so as to be movable in the axial direction in an airtight manner. The valve body 2 is detachably attached to one end of the plunger 6 protruding into the valve chamber 17. A retaining member 61 that also serves as a spring seat is fixed to the other end of the plunger 6 that protrudes into the spring receiver 13.

  A yoke 8 and a solenoid 9 for magnetizing the yoke 8 are provided in the cylinder 71 so as to surround the outer periphery of the plunger 6. 91 is a coil, and 92 is a non-magnetic bobbin. A fluid chamber 10 is formed between the outer periphery of the plunger 6 and the yoke 3 and the bobbin 92, and the magnetorheological fluid 11 is filled in the fluid chamber 10.

  The spring receiving cylinder 13 has a threaded portion 131 on the inner periphery, and the spring receiving disk 19 and the rotation-stopping disk 20 are screwed into this, and are connected by bolts 21 with a space between each other. The spring 3 is inserted between the spring receiving seat 61 and the spring receiving disk 19.

  In another embodiment shown in FIG. 3, a rubber film 25 such as a diaphragm or a bellowram is used as a sealing material instead of the sealing material 24 in the previous embodiment.

  In order to fix one end side of the rubber film 25 to the outer periphery of the plunger 6, a staying 26 and a holding rod 27 are attached to both ends of the plunger 6. A holding rod 27 is screwed to both ends of the plunger 6 via a staying 26, and the rubber film 25 is sandwiched between the staying 26 and the holding rod 27.

  The rod covers 74 and 75 are composed of main bodies 741 and 751 and presser covers 742 and 752, and the other end side of the rubber film 25 is sandwiched between them, and are tightened airtight with bolts. The rod cover main bodies 741 and 751 have oil supply ports 741a and 751a for supplying the magnetorheological fluid 11, respectively. The oil supply ports 741a and 751a are closed by steel balls 741b and 751b and bolts 741c and 751c. The through holes of the rod covers 74 and 75 are set so as to form a gap 28 between the outer periphery of the plunger 6, and the rubber film 25 is attached to the gap 28 so as to be folded back. The plunger 6 moves in the axial direction within a range in which the rubber film 25 extends.

  In the case of this embodiment, since the rubber film 25 is used as a sealing element between the plunger 6 and the rod covers 74 and 75, there is no sliding resistance, and the resistance against the movement of the valve body 2 is increased by the current flowing through the solenoid 9. It can be controlled precisely. There is no possibility that the iron powder contained in the magnetorheological fluid enters the sliding portion and wears the sealing material.

DESCRIPTION OF SYMBOLS 1 Valve apparatus 2 Valve body 3 Spring 4 Valve seat 5 Adjustment mechanism 6 Plunger 61 Retaining member 7 Casing 71 Cylinder 72 Cylinder cover 721 Oil supply port 722 Steel ball 723 Bolt 73 Cylinder cover 731 Oil supply port 732 Steel ball 733 Bolt 74 Rod cover 741 Rod cover body 742 Presser cover 75 Rod cover 751 Rod cover body 752 Presser cover 752
8 Yoke 9 Solenoid 10 Fluid chamber 11 Magnetorheological fluid 12 Valve case 13 Spring receiving cylinder 14 Oil feeding tube 15 Oil feeding tube 16 Retaining ring 17 Valve chamber 18 Connection flange 19 Spring receiving disc 20 Non-rotating disc 21 Bolt 22 Bolt 23 Sliding bush 24 Sealing material 25 Rubber film 26 Staying 27 Holding rod 28 Clearance

Claims (5)

The valve body is pressed against the valve seat by a spring force,
The valve body is coupled to one end of an iron plunger that is movably received in the axial direction by the biasing force adjusting mechanism,
The biasing force adjusting mechanism is formed between a casing for airtightly receiving the plunger, a yoke provided in the casing so as to surround the outer periphery of the plunger, a solenoid for magnetizing the yoke, and the outer periphery of the plunger and the yoke. A fluid chamber and a magnetorheological fluid filled in the fluid chamber,
A biasing force variable valve device characterized in that the apparent spring force is variable by increasing or decreasing the viscous resistance to the movement of the plunger by changing the current flowing to the solenoid. The casing of the urging force adjusting mechanism includes a rod cover that allows the plunger to penetrate airtightly,
The rod cover includes a through hole that forms a gap with the outer periphery of the plunger and allows the plunger to pass through.
2. The urging force variable valve device according to claim 1, wherein the gap is hermetically sealed by a rubber film whose intermediate portion is folded and inserted into the gap. The plunger penetrates the casing of the biasing force adjusting mechanism in an airtight manner, and the other end protrudes from the casing.
On the outside of the casing, a spring receiving portion for receiving the other end side of the plunger is provided,
The urging force variable valve device according to claim 1, wherein a spring that presses the other end of the plunger toward one end side is provided in the spring receiving portion. The spring receiving portion includes a cylindrical spring receiving tube that is concentrically fixed to the plunger on the outside of the casing, and a spring seat that is screwed to the spring receiving tube so as to be movable forward and backward in the axial direction.
The urging force variable valve device according to claim 3, wherein an initial deflection amount of the spring can be adjusted by adjusting the advance and retreat of the spring seat. The casing of the biasing force adjusting mechanism includes a rod cover that allows the plunger to pass through in an airtight manner on one end side,
The valve body and the valve seat are provided in a cylindrical inner case that is removably fitted inside a cylindrical valve case that is fixed to the apparatus body.
The valve seat is detachably connected to the inner end of the inner case on the device main body side,
The valve body is detachably connected to one end of the plunger protruding into the inner case,
The urging force variable valve device according to claim 1, wherein the rod cover is detachably connected to an outer end of the inner case.

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