WO2005050073A1

WO2005050073A1 - Magnetostrictive solenoid valve

Info

Publication number: WO2005050073A1
Application number: PCT/JP2004/016569
Authority: WO
Inventors: Teruo Mori; Toshihiro Suzuki
Original assignee: Tdk Corporation
Priority date: 2003-11-18
Filing date: 2004-11-09
Publication date: 2005-06-02
Also published as: JP2005147314A

Abstract

A magnetostrictive solenoid valve with a simplified structure, where the number of parts can be reduced and which enables highly accurate and high speed regulation of a fluid flow rate. A magnetostrictive solenoid valve (10) has a substantially tubular casing (12), a magnetic coil (20) disposed so as to surround the outer periphery of the casing (12), and a valve body (14) made from a magnetostrictive material, provided in an inner space (12A) of the casing (12) and displaced according to the variation of a magnetic field, applied by a magnetic coil (20), to regulate the flow rate of a fluid flowing in the inner space (12A).

Description

Specification

Magnetostrictive solenoid valve

Technical field

The present invention relates to a magnetostrictive solenoid valve that adjusts a flow rate of a fluid using a magnetostrictive element.

Background art

Conventionally, various types of magnetostrictive solenoid valves for adjusting a flow rate of a fluid using a magnetostrictive element as shown in FIGS. 9 and 10 have been proposed (see, for example, Japanese Patent Application Laid-Open No. 6-174128). ;).

[0003] This conventionally known magnetostrictive solenoid valve 1 is composed of a casing 2 in which a pipe 2A through which a fluid flows is formed, and a casing 2 provided in the pipe 2A. The magnetostrictive element 4 includes a magnetostrictive element 4 that expands and contracts correspondingly, and a valve body 5 that is an elastic member and is arranged in the axial direction of the magnetostrictive element 4.

In this magnetostrictive solenoid valve 1, as shown in FIG. 9, when no magnetic field is applied to the magnetostrictive element 4, the magnetostrictive element 4 contracts in the axial direction, and the casing 2 and the valve element 5 A fluid passage is formed between them, and the fluid is ready to flow through the pipe 2A. On the other hand, as shown in FIG. 10, when a magnetic field is applied to the magnetostrictive element 4, the magnetostrictive element 4 extends in the axial direction, whereby the valve element 5 is elastically deformed and the flow rate of the fluid is restricted. .

[0005] As described above, the magnetostrictive solenoid valve 1 can adjust the flow rate of the fluid by changing the area of the fluid passage by elastically deforming the valve body 5 by expansion and contraction of the magnetostrictive element 4! You.

[0006] While this force is applied, the conventionally known magnetostrictive solenoid valve 1 changes the area of the fluid passage by the valve element 5 which is also an elastic member, so that the valve element 5 changes with time and temperature. The deformation tends to cause errors in the flow rate adjustment of the fluid, and the improvement of the response speed of the valve element 5 (the speed required for elastic deformation) is limited, and the flow rate adjustment cannot be performed at high speed. There was a point. In addition, there is also a problem that if the number of parts is large and the structure is likely to be complicated, the cost will increase!

Disclosure of the invention

The present invention has been made to solve such a problem, and it is possible to reduce the number of parts and at the same time adjust the flow rate of a fluid with high accuracy and high speed. It is an object of the present invention to provide a magnetostrictive solenoid valve having a simple structure capable of performing the following.

[0008] The inventor of the present invention has found a magnetostrictive solenoid valve having a simple structure capable of adjusting the flow rate of a fluid with high accuracy and at high speed.

[0009] That is, the following objects of the present invention can achieve the above object.

[0010] (1) A substantially cylindrical casing, a valve body made of a magnetostrictive member disposed in an inner space of the casing, and a valve body arranged to surround the outside of the casing, and applying a magnetic field to the valve body. And the electromagnetic coil displaces the valve body in the radial direction of the inner space to adjust the flow rate of the fluid flowing in the inner space. Magnetostrictive solenoid valve.

(2) The magnetostrictive solenoid valve according to (1), wherein the inner space can be closed by the valve element.

(3) The valve body is formed of a plate-like body disposed along a radial direction of the inner space, and

A magnetostrictive solenoid valve according to (1) or (2), wherein a columnar soft magnetic member is coaxially disposed on both sides in the thickness direction of the valve body.

(4) The valve element has a cylindrical body arranged coaxially with the casing, and a column-shaped soft magnetic member is disposed so as to penetrate an inner space of the valve element. The magnetostrictive solenoid valve according to the above (1) or (2), which is characterized by:

(5) The magnetostrictive solenoid valve according to any one of the above (1) to (4), wherein the casing and the valve element have substantially the same thermal expansion coefficient.

(6) The magnetostrictive solenoid valve according to any one of (1) to (5), wherein a preload can be applied in a magnetic field direction of the electromagnetic coil in the valve body.

(7) The magnetostrictive solenoid valve according to any one of (1) to (6), wherein the valve body is made of a giant magnetostrictive member made of a giant magnetostrictive element.

Brief Description of Drawings

FIG. 1 is a schematic sectional side view showing a magnetostrictive solenoid valve according to Embodiment 1 of the present invention.

[Figure 2] Sectional view along line II in Figure 1

[FIG. 3] A graph showing the relationship between the magnitude of the magnetic field applied to the valve body and the displacement of the valve body in FIG. FIG. 4 is a schematic side sectional view showing a state before a magnetic field is applied to the magnetostrictive solenoid valve according to the first embodiment.

FIG. 5 is a schematic side sectional view showing a state where a magnetic field is applied to the magnetostrictive solenoid valve.

FIG. 6 is a graph showing a relationship between a magnitude of a magnetic field applied to a valve body and a gap area in the magnetostrictive solenoid valve.

FIG. 7 is a schematic side sectional view showing a state before a magnetic field is applied to the magnetostrictive solenoid valve according to the second embodiment.

FIG. 8 is a schematic side sectional view showing a state where a magnetic field is applied to the magnetostrictive solenoid valve.

FIG. 9 is a schematic sectional side view showing a state before a magnetic field is applied to a conventional magnetostrictive solenoid valve.

FIG. 10 is a schematic side sectional view showing a state where a magnetic field is applied to the magnetostrictive solenoid valve.

BEST MODE FOR CARRYING OUT THE INVENTION

[0018] The present invention provides a substantially cylindrical casing, a valve body made of a magnetostrictive member provided in an inner space of the casing, and a valve body surrounding the outside of the casing, and applying a magnetic field to the valve body. An electromagnetic coil to be applied, the electromagnetic coil displacing the valve body in a radial direction of the inner space to adjust a flow rate of a fluid flowing in the inner space, thereby achieving the above object. Is solved.

Hereinafter, Embodiments 1 and 2 of the present invention will be described in detail with reference to the drawings.

Example 1

As shown in FIGS. 1 and 2, the magnetostrictive solenoid valve 10 according to the first embodiment of the present invention includes a substantially cylindrical casing 12, and an inner space 12A of the casing 12 includes: A valve body 14 made of a disc-shaped giant magnetostrictive member arranged along the radial direction of the inner space 12A, and first and second cylindrical members arranged on both sides in the thickness direction of the valve body 14. 2 Magnetic yokes (soft magnetic components) 16 and 18 are accommodated. In this example, the coefficients of thermal expansion of the casing 12 and the valve body 14 are substantially the same.

In addition, an electromagnetic coil 20 is provided around the casing 12 so as to surround the casing 12. Further, disk-shaped punching metals 22A and 22B are attached to the vicinity of the flange portion on one end 12B of the casing 12 and the flange portion on the other end 12C, respectively. The valve element 14 and the first and second magnetic yokes 16 and 18 are bonded and integrated via a polyethylene film 24. Further, a counter panel 26A is provided between one end 16A of the first magnetic yoke 16 and the punching metal 22A.

On the other hand, between the one end 18A of the second magnetic yoke 18 and the punching metal 22B, the punching metal 22C and the counter panel 26B are slidably disposed in the inner space 12A in the axial direction. Further, the punching metal 22C and the counter panel 26B are positioned while being pressed in the axial direction by a pressing screw 28 attached to the center of the punching metal 22B.

As described above, the valve element 14 and the first and second magnetic yokes 16 and 18 are moved in the axial direction in the inner space 12A by the members such as the punching metals 22A and 22C and the counterpanes 26A and 26B. Is regulated, and a predetermined preload in the axial direction is applied to the valve body 14 by the pressurizing screw 28.

[0025] Each of the punching metals 22A-22C is provided with a punching hole for allowing a fluid such as oil or gas to pass therethrough. In the present embodiment, the fluid flows through the inner space 12A of the casing 12 in FIG. The left force in 1 also flows to the right.

[0026] The valve element 14, which also includes a giant magnetostrictive member, uses a giant magnetostrictive element as a material. Here, the term “giant magnetostrictive element” refers to a powdered sintered alloy or a single crystal alloy made mainly of a rare earth element and Z or a specific transition metal (for example, terbium, dysprosium, iron, etc.). Magnetostrictive element, which has the property of causing large displacement when an external force magnetic field is applied.

The magnetostrictive member includes a positive magnetostrictive member having a positive magnetostrictive characteristic and a negative magnetostrictive member having a negative magnetostrictive characteristic. Positive magnetostrictive members have the property of expanding in the direction of a magnetic field when an external force magnetic field is applied. With the expansion in the direction of the magnetic field, the positive magnetostrictive member contracts in a direction orthogonal to the direction of the magnetic field. On the other hand, a negative magnetostrictive member has the property of contracting in the direction of the magnetic field when an external force magnetic field is applied. With the contraction of the direction of the magnetic field, the negative magnetostrictive member extends in a direction perpendicular to the direction of the magnetic field.

FIG. 3 shows the magnetostriction characteristics of the valve element 14 in the present embodiment. The solid line in the figure indicates the relationship between the magnitude of the applied magnetic field and the displacement in the direction of the magnetic field. The broken line shows the relationship between the magnitude of the applied magnetic field and the displacement in the direction perpendicular to the direction of the magnetic field.

As described above, in the first embodiment, the positive giant magnetostrictive member is used as the valve body 14, and its composition is TbO.34DyO.66Fel.88. It is needless to say that the valve element according to the present invention is not limited to a positive magnetostrictive member, but may be a negative magnetostrictive member.

The electromagnetic coil 20 is capable of applying a magnetic field in the thickness direction to the valve element 14, and extending the valve element 14 in the thickness direction (magnetic field direction) by changing the magnetic field. Reduce in the radial direction (direction orthogonal to the magnetic field direction).

Next, the operation of the magnetostrictive solenoid valve 10 will be described with reference to FIGS.

When no magnetic field is applied to the valve body 14, as shown in FIG. 4, the valve body 14 comes into close contact with the inner peripheral surface of the casing 12, so that the fluid F Can not pass through the inside space 12A of. Therefore, it is possible to completely close the inner space 12A by the valve element 14.

On the other hand, when a magnetic field in the thickness direction is applied to the valve body 14 by the electromagnetic coil 20, the valve body 14 expands in the thickness direction and contracts in the radial direction, as shown in FIG. I do. As a result, a gap is formed between the casing 12 and the valve body 14, and the fluid can pass through the inside space 12A of the casing 12.

[0034] The inventors of the present invention collected data on the relationship between the magnitude of the magnetic field applied by the electromagnetic coil 20 and the gap area formed between the casing 12 and the valve element 14. In this experiment, a disc-shaped giant magnetostrictive member having a diameter of 20 mm and a length of 5 mm was used as the valve element 14, and a preload of 60 kgfZcm ² was applied to the valve element 14 by the pressing screw 28. Further, the gap area was measured after a lapse of 0.1 lm seconds after the application of the magnetic field by the electromagnetic coil 20.

As a result, as shown in FIG. 6, the magnitude of the magnetic field generated by the electromagnetic coil 20 and the gap area have a linear relationship in the entire range of 0 to 80 (kAZm) from which the data was collected. Was found. In other words, by changing the magnitude of the magnetic field generated by the electromagnetic coil 20, the flow rate of the fluid F flowing in the inner space 12A of the casing 12 can be adjusted with high accuracy. Also, according to the present experiment, the magnetostrictive solenoid valve 10 has a gap of 0.1 lm seconds. It can be seen that the area can be changed and the flow rate can be adjusted extremely quickly.

[0036] According to the magnetostrictive solenoid valve 10 according to the first embodiment of the present invention, the substantially cylindrical casing 12 and the valve element 14 also including the magnetostrictive member 14 disposed in the inner space 12A of the casing 12 are provided. And an electromagnetic coil 20 arranged so as to surround the outside of the casing 12 and applying a magnetic field to the valve element 14.The electromagnetic coil 20 displaces the valve element 14 in the radial direction of the inner space 12A. Since the flow rate of the fluid flowing in the inner space 12A is adjusted, the flow rate of the fluid can be adjusted with high accuracy and at high speed. Further, since the valve element 14 itself functions as an actuator, the number of parts can be reduced.

In particular, the valve element 14 also has a plate-like body force arranged along the radial direction of the inner space 12A, and has a columnar magnetic yoke (soft magnetic member) 16 on both sides in the thickness direction of the valve element 14; Since the 18 is coaxially arranged, the magnetic field generated by the electromagnetic coil 20 can be efficiently guided to the valve element 14, and the flow rate of the fluid can be adjusted with higher accuracy and at a higher speed. Since the valve body 14 is formed in a plate shape, the size of the device can be reduced, and the (fluid) flow disturbance due to the valve body can be suppressed.

[0038] Further, since the thermal expansion coefficients of the casing 12 and the valve body 14 are substantially the same, it is possible to prevent an error in the flow rate adjustment of the fluid due to the deformation of the member due to the temperature change.

[0039] Further power! ] Since the preload can be applied in the direction of the magnetic field of the electromagnetic coil 20 in the valve body 14 by the pressure screw 28, the displacement amount of the valve body 14 can be increased. Accuracy and response speed have been increased!

Example 2

Next, a magnetostrictive solenoid valve 30 according to Embodiment 2 of the present invention will be described.

As shown in FIG. 7, the magnetostrictive solenoid valve 30 according to the second embodiment of the present invention includes the valve element 14 and the first and second magnetic yokes 16 of the magnetostrictive solenoid valve 10 according to the first embodiment. In place of the valve body 18, a valve body 32, which is also provided with a cylindrical giant magnetostrictive member disposed coaxially with the casing 12, and a cylindrical magnetic body arranged so as to penetrate the inner space of the valve body 32. It has a yoke 34. The movement of the valve body 32 and the magnetic yoke 34 in the axial direction is restricted by punching metals 36A and 36B arranged at both ends in the axial direction. Other structures are the same as those in the first embodiment. Since it is the same as the magnetostrictive solenoid valve 10, the description is omitted.

[0042] In this magnetostrictive solenoid valve 30, when no magnetic field is applied to the valve body 32, as shown in Fig. 7, the cylindrical valve body 32 has the inner peripheral surface of the casing 12 and the magnetic yoke. The fluid F cannot pass through the inside space 12A of the casing 12 because the fluid F comes into close contact with the outer peripheral surface of the casing 34.

On the other hand, when an axial magnetic field is applied to the valve body 32 by the electromagnetic coil 20, the valve body 32 expands in the axial direction and contracts in the radial direction, as shown in FIG. The fluid can pass through the inside space 12A of the casing 12.

According to the magnetostrictive solenoid valve 30 according to the second embodiment, the same effect as the magnetostrictive solenoid valve 10 according to the first embodiment can be obtained, and the magnetic yoke 34 controls the magnetic field of the electromagnetic coil 20. The flow can be efficiently guided to the body 32, and the accuracy of flow rate adjustment and the response speed can be further improved.

[0045] The magnetostrictive solenoid valve according to the present invention is not limited to the structure and shape of the magnetostrictive solenoid valves 10, 30 according to the first and second embodiments. The valve body 32 may be a polygonal cylinder or the like. Further, when it is not necessary to change the flow rate of the fluid so much, a magnetostrictive member having a magnetostrictive element may be used as the valve body. If it is not necessary to adjust the flow rate with such high accuracy, the magnetic yokes 14, 16, 34 and the screw 28 for calo-pressure need not be provided.

That is, a substantially cylindrical casing, a valve body composed of a magnetostrictive member disposed in the inner space of the casing, and a valve body arranged to surround the outside of the casing, and a magnetic field is applied to the valve body. A magnetostrictive electromagnetic valve comprising: an electromagnetic coil that displaces the valve body in a radial direction of the inner space by the electromagnetic coil to adjust a flow rate of a fluid flowing in the inner space. Just fine.

Industrial applicability

[0047] The magnetostrictive solenoid valve having a simple structure according to the present invention can adjust the flow rate of fluid with high accuracy and at high speed while reducing the number of parts.

Claims

The scope of the claims

[1] A substantially cylindrical casing, a valve body formed of a magnetostrictive member disposed in an inner space of the casing, and an electromagnetic field disposed to surround the outside of the casing and applying a magnetic field to the valve body. Wherein the electromagnetic coil displaces the valve body in a radial direction of the inner space to adjust a flow rate of a fluid flowing in the inner space. solenoid valve.

[2] In claim 1,

A magnetostrictive solenoid valve, wherein the inner space can be closed by the valve element.

[3] In claim 1,

The valve body is formed of a plate-like body arranged along the radial direction of the inner space, and a columnar soft magnetic member is coaxially arranged on both sides in the thickness direction of the valve body. Magnetostrictive solenoid valve.

[4] In claim 2,

[5] In claim 1,

The valve body is formed of a cylindrical body disposed coaxially with the casing, and a columnar soft magnetic member is provided so as to penetrate an inner space of the valve body. solenoid valve.

[6] In claim 2,

[7] In any one of claims 1 to 6,

A magnetostrictive solenoid valve, wherein the casing and the valve element have substantially the same thermal expansion coefficient.

[8] In any one of claims 1 to 6, A magnetostrictive solenoid valve characterized in that a preload can be applied in a direction of a magnetic field of the electromagnetic coil in the valve body.

[9] In any one of claims 7,

A magnetostrictive solenoid valve characterized in that a preload can be applied in a direction of a magnetic field of the electromagnetic coil in the valve body.

[10] In any one of claims 1 to 6,

The valve body is made of a giant magnetostrictive member made of a giant magnetostrictive element.

[11] In claim 7,

[12] In claim 8,

[13] In claim 9,