JPH03181684A - Fluid control device - Google Patents

Abstract

PURPOSE:To prevent generation of a vibration to a device and to reduce the noise even in the case of a high speed fluid flow by composing a flow control device with a flow passage of the fluid, and a shape memory body which is provided in the passage, and controls the flow in multistages, and a heating means thereof. CONSTITUTION:At first, in the condition a current is not fed to nickel-chromium wires 8, the cross section area of the flow passage is made maximum, the fluid flowing in from a fluid entrance 5 is made maximum, and flows out from a fluid exit 6. And when the current is fed to the nickel-chromium wires 8, plural shape memory resins 7 are heated by the nickel-chromium wires 8, changed to the form memorized beforehand, and the cross section area of the flow passage is reduced gradually. Furthermore, by changing the current fed to the nickel-chromium wires 8 with switches 9, the number of throttling steps can be regulated as desired, and the flow can be controlled. Since the flow passage of the fluid can be changed by plural shape memory resins 7 in such a way, the flow of every fluid can be controlled in multistages, and even though the fluid is of a high flow speed, it can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fluid control device for controlling the flow of gas or fluid.

Prior Art Such a fluid control device is known, for example, from Utility Model Application No. 61-156.
As shown in Publication No. 773, it had a structure as shown in FIG. In other words, a magnetic fluid 2 is placed in a flow path 1 by an electromagnet 3.
The flow rate of the fluid is controlled by changing the cross-sectional area of the flow path l by changing the strength of the magnetic field.

Problems to be Solved by the Invention However, in such a structure, since the magnetic fluid 2 itself is exposed to the fluid flowing through the flow path 1, the magnetic fluid 2
It causes a reaction with the fluid itself. Therefore, it can only be used with a limited number of fluids that do not cause any change. Furthermore, since the flow rate of the fluid is controlled using a magnetic fluid, it is difficult to control a fluid with a high flow rate. Furthermore, since the fluid flow rate is controlled in a single stage, the pressure difference between the fluids controlled in one stage becomes large, which causes vibration in the fluid control device and causes noise generation.

Therefore, the present invention heats a plurality of shape memory bodies using a heating means to arbitrarily vary the flow path cross-sectional area of the fluid by the plurality of shape memory bodies, thereby making it possible to control the flow rate of any fluid in multiple stages and achieve a high flow rate. A first object of the present invention is to obtain a fluid control device that produces low noise without causing vibration in the device even in the case of fluid.

A second object is to use a plurality of shape memory resins for the plurality of shape memory bodies, thereby making it possible to control the flow rate of a flammable fluid with less occurrence of electric leakage.

A third object is to use an alloy for the plurality of shape memory bodies and to energize the plurality of shape memory alloys themselves, thereby making it possible to omit a heating means and to save space.

Moreover, the fourth object is that since the heating means is provided in contact with the plurality of shape memory bodies, the shape can be changed with high efficiency.

A fifth object is to prevent fluid from leaking from the seal portion for energizing by providing the heating means outside the flow path facing the plurality of shape memory bodies.

In order to solve the problems and to further achieve the first object, the present invention uses a plurality of shape memory bodies in multiple stages in a fluid control device.

Moreover, in order to achieve the second object, the present invention uses a plurality of shape memory resins for a plurality of shape memory bodies.

Furthermore, in order to achieve the third object, the present invention uses a plurality of shape memory alloys in a plurality of shape memory bodies.

Furthermore, in order to achieve the fourth object, the present invention provides heating means in contact with a plurality of shape memory bodies.

Furthermore, in order to achieve the fifth object, the present invention provides a heating means outside the flow path facing the plurality of shape memory bodies.

Function The fluid control device using a plurality of shape memory bodies of the present invention has the following features:
The flow rate of the fluid can be varied by changing the shape of the plurality of shape memory bodies.

Furthermore, by using a plurality of shape memory resins in a plurality of shape memory bodies, the cross-sectional area of the fluid flow path can be varied in multiple stages by heating the plurality of shape memory resins, and the flow rate of the fluid can be controlled. Further, by using a plurality of shape memory alloys in a plurality of shape memory bodies, the plurality of shape memory alloys themselves can be energized to serve as a heating means, and the space can be reduced. Furthermore, since the heating means is provided in contact with the plurality of shape memory bodies, the flow rate of the fluid can be controlled with high efficiency.

Furthermore, by providing the heating means outside the flow path facing the plurality of shape memory bodies, it is possible to prevent fluid from leaking from the seal portion for energizing.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIGS. 1 and 2, 4 is a cylindrical pipe line serving as a fluid flow path, 5 is a fluid inlet, and 6 is a fluid outlet. In addition, a plurality of shape memory resins 7 which are shape memory bodies are provided in multiple stages in the conduit, and nichrome M8 which is a heating means is in contact with the plurality of shape memory resins 7 and between the conduit 4. Each is provided. Here, the plurality of shape memory resins 7 are
It is preliminarily memorized that when heat is applied, the fluid compresses in the flow direction and expands in the direction perpendicular to the fluid flow, and the flow path area gradually increases as it goes from the fluid population 5 to the outlet 6. It becomes smaller.

Next, the operation of the configuration of this embodiment will be explained. First, when the nichrome wire 8 is not energized, the cross-sectional area of the flow path is at its maximum, and the fluid flowing in from the fluid outlet 5 reaches its maximum flow rate and flows out from the fluid outlet 6.

Further, when the nichrome wire 8 is energized, the plurality of shape memory resins 7 are heated by the nichrome m8 and change to the pre-memorized shape, thereby gradually reducing the cross-sectional area of the flow path. Furthermore, by switching the t-current flowing through the nichrome wire 8 using a switch 9, the number of throttling stages can be arbitrarily adjusted, making it possible to control the flow rate.

Next, in the embodiment shown in FIG. 3, the heating means Nichrome vA8
This is a case where the shape memory resin 7 is provided outside the flow path facing the plurality of shape memory resins 7.

Next, in the embodiment shown in FIG. 4, a plurality of shape memory alloys 10 are used in a plurality of shape memory bodies. It has the same effect as the plurality of shape memory resins 7 shown in the above embodiment, but by energizing the plurality of shape memory alloys 10 themselves without providing a heating means, self-heating occurs and the heat is used to spread the plurality of shape memory alloys 10.
It transforms into a shape that is vaguely memorized.

Effects of the Invention As described above, the present invention is capable of changing the flow path of the fluid by using a plurality of shape memory bodies, so that the flow rate of all fluids can be controlled in multiple stages, and even fluids with high flow velocity can be controlled. Since it is possible to reduce the pressure difference between the fluids, a low-noise water flow control device can be achieved without causing vibration in the device.

Also, if the structure uses resin for multiple shape memory bodies,
Since there is no need to energize the resin itself, there is little risk of electrical leakage and the flow rate of the flammable fluid can be controlled.

In addition, if the structure uses an alloy for multiple shape memory bodies,
By applying electricity to the alloy itself, the shape can be changed by self-heating, so no heating means is required and the space can be reduced.

Moreover, if the heating means is provided in contact with a plurality of shape memory bodies, it is possible to efficiently deform the plurality of shape memory bodies.

Furthermore, if the heating means is provided outside the flow path facing the plurality of shape memory bodies, it becomes possible to energize the heating means outside the flow path, thereby preventing leakage of fluid from the seal part required for energization. Does not occur.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a fluid control device according to an embodiment of the present invention at maximum flow rate, Fig. 2 is a longitudinal cross-sectional view of the fluid control device when the flow rate is throttled, and Fig. 3 is a heating means of the same device. Fig. 4 is a longitudinal cross-sectional view of the same device when an alloy is used for multiple shape memory bodies, and Fig. 5 is a conventional fluid control device using magnetic fluid. FIG. 4...Flow path, 7...Plural shape memory resins, 8...Heating means, 10...Plural shape memory alloys.

Claims (5)

[Claims] (1) A fluid control device comprising a fluid flow path, a plurality of shape memory bodies provided in the flow path for controlling the flow rate of the fluid in multiple stages, and a heating means for heating the plurality of shape memory bodies. (2) The fluid control device according to claim 1, wherein the plurality of shape memory bodies are made of resin. (3) The fluid control device according to claim 1, wherein the plurality of shape memory bodies are made of an alloy. (4) The fluid control device according to claim 1, wherein the heating means is provided in contact with a plurality of shape memory bodies. (5) The fluid control device according to claim 1, wherein the heating means is provided outside the flow path facing the plurality of shape memory bodies.