JPH01169185A - Flow control device - Google Patents

Abstract

PURPOSE:To promote the improvement of controllability and responsiveness by providing the first and second control magnetic field generating units respectively in a pipe external part in its position corresponding to a bag part and in a pipe internal part almost in its center surrounded by the bag part. CONSTITUTION:A control magnetic field acts on magnetic fluid 4, sealed in a bag part 3, by the first control magnetic field generating unit 5 from outside a pipe 1 while by the second control magnetic field generating unit 6 from almost the center of the pipe 1. Consequently, the magnetic fluid 4 is moved between both the opposed facing control magnetic field generating units 5, 6 by the magnetic field in the same direction generated from both the units 5, 6, and protruding the bag part 3 from its flat condition to be deformed to a condition that the point end of the bag part is closely attached to the second control magnetic field generating unit 6, a passage of fluid can be controlled from its fully opened condition to fully closed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flow rate control device that controls the flow rate of fluid flowing in a pipe by utilizing the action of a magnetic fluid.

(Prior art) Conventionally, this type of flow rate control device was disclosed in Japanese Patent Application Laid-open No. 59-23.
The one described in Publication No. 1279 was proposed. As shown in FIG. 7, a donut-shaped bag portion 62 made of a flexible membrane and whose outer periphery is in contact with the inner peripheral surface of the tube 61 is provided inside a tube 61 through which fluid such as air flows. A magnetic fluid 63 is sealed inside the section 62, and a bag section 6 on the outer periphery of the tube 61 is sealed.
An annular control magnetic field generator 64 is provided at a position corresponding to 2, and the magnetic fluid 63 in the bag portion 62 is moved by the control magnetic field emitted from the control magnetic field generator 64 toward the inside of the tube 61. By.

The bag portion 62 is raised according to the strength of the control magnetic field, and the bag portion 62
The amount of fluid passing through the passage is adjusted by changing the cross-sectional area of the fluid passage surrounded by the passage.

(Problems to be Solved by the Invention) In the above configuration, the strength of the control magnetic field acting on the magnetic fluid 63 in the bag portion 62 becomes weaker as the distance from the control magnetic field generator 64 increases. The influence of the control magnetic field is weaker near the center axis of the tube 61 than on the other side. However, when the bag portion 62 is raised to narrow the passage formed by the inner periphery of the bag portion 62, the pressure of the fluid passing through the passage increases. It becomes easier to deform against the force received from the control magnetic field of the magnetic fluid 63 sealed inside. Therefore, in the conventional example described above, the more the fluid passage is narrowed by raising one bag part 62, the more the bag part 62 is raised.
The influence of the control magnetic field on the magnetic fluid 63 near the inner circumference of the magnetic fluid 63 becomes weaker, resulting in poor responsiveness and making it difficult to accurately control the restriction of the fluid passage against fluid pressure. . Furthermore, in this conventional example, it is extremely difficult to completely close the fluid passage.

Therefore, in the present invention, in view of the problems of the above-mentioned conventional example.

In a flow control device using a magnetic fluid, it is intended to improve controllability and responsiveness over the entire flow control range, and to make it possible to reliably completely close a fluid passage.

(Means for Solving the Problems) The present invention provides a bag portion made of a flexible membrane so as to surround the cross section of the tube through which the fluid passes, and seals a magnetic fluid within the bag portion. In addition, a first control magnetic field generator is provided on the outside of the tube at a position corresponding to the bag portion, and a second control magnetic field generator is provided inside the tube at approximately the center surrounded by the bag portion. It is.

(Function) In the above configuration, in the present invention, the control magnetic field from the first control magnetic field generator acts on the magnetic fluid sealed inside the bag portion from the outside of the tube, and the second control magnetic field from approximately the center of the tube acts on the magnetic fluid sealed inside the bag portion. A control magnetic field from a control magnetic field generator is applied. For this reason, the magnetic fluid is moved between both opposing control magnetic field generators by the magnetic fields in the same direction emitted from both, causing the bag to bulge from its flat state and the tip thereof to the second control magnetic field generator. Transform it until it fits tightly.

In this way, by deforming the bag part by the opposing control magnetic field and changing the cross-sectional area of the fluid passage in the tube surrounded by the bag part, the bag part is brought into close contact with the second control magnetic field generator from the fully open state of the fluid passage. It can be controlled in a range up to a fully open state that surrounds the vehicle.

(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

FIGS. 1 and 2 are diagrams showing the configuration of an embodiment of the present invention. In FIG. 1, a tube 1 through which a fluid such as air flows is formed by connecting tubes 1a and 1b of equal diameter at flanges 2a and 2b provided at both ends. A donut-shaped bag portion 3 is provided inside the tube 1a, which is coaxial with the tube 1 and has the inner circumferential surface of the tube 1a as part of its outer circumferential surface. The bag portion 3 is made of a flexible material such as rubber, synthetic rubber, or synthetic resin, and is made of a magnetic material in which ultrafine particles of magnetic material such as ferrite are dispersed in a solvent such as oil or water via a surfactant. A fluid 4 is enclosed. On the outside of the tube 1a, on the outer peripheral surface facing the bag portion 3 across the tube wall,
An annular first control magnetic field generator 5 as shown in FIG. 2 is provided.

A cylindrical second control magnetic field generator 6 is also arranged at the axial center of the bag portion 3 in the tube 1a, and this second control magnetic field generator 6 is shown in FIGS. 1 and 2. As in, tube 1
1 to a support member 8 fixed to the inner end of three bridging members 7 provided in the radial direction of the pipe 16 with the outer end fixed to the tube 16.
It is coaxially fixed to the central axis of the tube 1b via a cylindrical seat 9. The bridging member 7 has a cross-sectional shape such as an ellipse or a symmetrical airfoil shape in order to reduce the resistance to the air flow in the pipe 1, and the support member 8 is provided on the upstream side of the air flow in the pipe 1 (in this embodiment) for the same purpose. In the example, if the airflow flows from the left side to the right side in FIG. 1, the left side) is formed into a narrow spindle-shaped cross section. The maximum outer diameter of the support member 8 and the outer diameter of the seat portion 9 are the second
The support member 8 is equal to the outer diameter of the control magnetic field generator 6,
The outer peripheral surfaces of the seat portion 9 and the second control magnetic field generator 6 are smoothly connected. The first and second control magnetic field generators 5 and 6 are composed of electromagnets and the like, and are energized and controlled by a control device (not shown) to generate magnetic fields in the same direction and with controlled intensity.

FIG. 3 shows a modification of the embodiment shown in FIG. 1, in which the bridging member 7 and the support member 8 are fixedly supported on a short tube 10 having the same diameter as the tubes 1a and 1b, and are inserted between the tubes 1a and 1b. and is connected at its flange 10a to the flanges 2a and 2b of the tubes 1a and 1b.

The flexible bag portion 3 is pre-formed to a size such that when it is extended in the radial direction of the tube 1a, its inner diameter is smaller than the outer diameter of the second control magnetic field generator 6.
Fixed.

Next, the operation of this embodiment will be explained. First, the first and second
If the control magnetic field emitted from the control magnetic field generators 5 and 6 is absent or weak, the magnetic fluid 4 in the bag 3 will not be affected by the magnetic field, and the magnetic fluid 4 in the bag 3 will not be affected by the magnetic field as shown in FIG. 3 has a flat shape, and the cross-sectional area of the fluid passage formed by the inner peripheral part of the bag part 3 and the outer peripheral surface of the second control magnetic field generating device 6 is the widest, and is in a fully open state. Next, when the control magnetic fields emitted from the first and second control magnetic field generators 5 and 6 are strengthened, the magnetic fluid 4 in the bag portion 3 is affected by the magnetic force from the control magnetic field in the axial center direction of the tube 1 ( 2), and the movement of the magnetic fluid 4 causes the bag portion 3 to rise as shown in FIG. Therefore, the cross-sectional area of the fluid passage between the bag portion 3 and the second control magnetic field generating device 6 is reduced, the fluid passage is constricted, and the amount of fluid passing through the passage is reduced. Then, when the control magnetic field is further strengthened, the bag portion 3 further bulges, and as shown in FIG. The fluid passage between the control magnetic field generating device 6 and the second control magnetic field generating device 6 becomes fully open.

In this embodiment, a control magnetic field is applied to the magnetic fluid 4 sealed inside the donut-shaped bag 3 from both the outer circumference and the axial center of the tube 1 by the surface control magnetic field generators 5 and 6. , near the inner periphery of the bag portion 3 where the influence of the control magnetic field from the first control magnetic field generator 5 has weakened due to the distance from the first control magnetic field generator 5 outside the tube 1 due to the protrusion of the bag portion 3 As the distance between the magnetic fluid 4 and the second control magnetic field generator 6 decreases, the influence of the control magnetic field from the second control magnetic field generator 6 becomes stronger. Therefore, no matter where the magnetic fluid 4 in the bag 3 moves to any position within the cross section of the tube 1, the first and second control magnetic field generators 5 and 6
Since the control magnetic field from either of the two is reliable and the distance between the surface control magnetic field generators 5 and 6 is short and a strong magnetic field can be obtained, responsiveness is achieved over the entire control range from fully open to fully open. , the controllability can be improved, and since the second control magnetic field generating device 5 is located in the sealed part when fully closed, it resists the fluid pressure in the tube 1 and closes the inner peripheral part in the bag part 3. It is possible to strongly attract the magnetic fluid 4 of the bag portion 3 and firmly bring the inner circumferential portion of the bag portion 3 into close contact with the outer circumferential surface of the second control magnetic field generator 6, thereby achieving a reliable fully closed state.

In the above embodiment, the second control magnetic field generating device 6 was arranged coaxially with the center axis of the tube 1, but depending on the installation conditions of this device, the magnetic field inside the tube 1 may be affected due to the weight of the magnetic fluid 4. There may be cases where the distribution of the fluid 4 in the circumferential direction is not uniform, so in that case, the second control magnetic field generator 6 is arranged eccentrically in accordance with the distribution of the magnetic fluid 4. bias can be offset. Also in this case,
By replacing the bridging member 7, the position of the second control magnetic field generator 6 can be freely selected.

Furthermore, although the donut-shaped bag portion is provided in the above embodiment, the bag portion may be divided into a plurality of pieces and arranged to surround the inner periphery of the tube.

(Effects) As described above, the present invention provides a bag portion that is disposed in a tube so as to surround one cross section thereof and that has a magnetic fluid sealed therein, and a position corresponding to the bag portion outside the tube. By providing the first and second control magnetic field generators at approximately the center surrounded by the bag inside the tube, the magnetic fluid in the bag is located between the opposing surface control magnetic field generators, and both Because it is affected by the control magnetic field from the surface control magnetic field generator, the control magnetic field will definitely act on the magnetic fluid no matter where it is between the surface control magnetic field generators, and it will always respond well depending on the strength of the magnetic field. The magnetic fluid moves and deforms the bag, and the cross-sectional area of the fluid passage surrounded by the bag can be changed, so the amount of fluid passing through the fluid passage can be controlled over the entire control range from fully open to fully open. can be controlled accurately, and the fully open state is obtained by the inner circumference of the bag being in close contact with the outer circumferential surface of the second control magnetic field generator, which is the magnetic field generation source. The bag portion can be firmly brought into close contact with the second control magnetic field generator against resistance.

It has the effect of being able to reliably bring the fluid passage into a fully closed state with high sealing performance.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the configuration of an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. Sectional view of a modification of the embodiment shown in FIG.
6 to 6 are diagrams for explaining the operation of an embodiment of the present invention, and FIG. 7 is a longitudinal sectional view of a conventional flow rate control device. DESCRIPTION OF SYMBOLS 1... Pipe 3... Bag portion 4... Magnetic fluid 5... First control magnetic field generator 6... Second control magnetic field generator 7... Bridge member 8... Support Member 9... Seat Patent applicant Nippondenso Co., Ltd. Figure 1 Figure 2 Figure 3rI! I Figure 4 @ Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] a tube through which a fluid passes; a bag portion made of a flexible membrane and disposed within the tube so as to surround a cross section of the tube; a magnetic fluid sealed in the bag portion; A first control magnetic field generating device disposed outside at a position corresponding to the bag portion, and a second control magnetic field generating device disposed inside the tube at a substantially center surrounded by the bag portion. A flow rate control device characterized by: