JPS6050280A - Response improvement system for shape-memory alloy - Google Patents

Abstract

PURPOSE:To achieve reliable stroke by combining shape-memory alloy with a magnet thereby sharpening the rising of response of coil spring against the temperature variation. CONSTITUTION:Upon feeding of hot fluid (A), a coil spring 19 will respond in extending direction while coil spring 20 will respond in contracting direction. Consequently, a tube 8 is advanced laterally, and since a guide groove 16 is made obliquely in the circumference of said tube 8, the magnets 9', 10' are rotated forcefully against attraction to the magnets 11', 12'. Similarly, the magnets 9, 10 will rotate to move to the position shifted by 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device whose purpose is to functionally improve the responsive operation of a shape memory alloy coil spring to temperature changes.

That is, this device combines a coil spring made of a shape memory alloy and a magnet to establish responsive operation due to temperature changes as a sharp and steady stroke behavior.

Various attempts have been made to incorporate shape memory alloy coil springs into various devices, as they can perform both temperature sensor and actuator functions with one simple element. Use as material
There are almost no examples of successful development and practical use.

As shown in Figure 4, the amount of change in the shape memory alloy's response to temperature changes is rapid.

In addition, when the temperature fluctuates significantly, it shows extremely good results, but when it gradually changes around the set temperature for transformation, especially when the heating medium is a gas or when the r? -h 4-4
n L J+ -1-1-n Δ1*White++4- I(
l R1+ 1 41 people Su-shi- It is not necessarily a sensitive operation, and it is delicately influenced by other external conditions such as the applied load.

This is because it has been difficult to adequately satisfy functions such as reliable operability required as a practical industrial functional material.

Therefore, in the present invention, instead of using a shape memory alloy coil spring alone, by combining it with a magnet,
The idea is to utilize the attractive force and repulsive force of the magnet to absorb the slow response to temperature changes of the shape memory alloy coil spring, and to realize a sharp and steady stroke operation.

Therefore, the present invention can be used in various ways, such as as a drive source for an engine using relatively low-temperature waste heat, or as a drive device for opening and closing valves.

As a specific example, the configuration will be described here in the case where the response operation improvement device of the present shape memory alloy is incorporated into a temperature-based classification valve.

FIG. 1 is a cross-sectional view of the improved device of the present invention applied to a temperature-based classification valve.

FIGS. 2 and 3 are cross-sectional views along the a-a' cotton line and the bb-cotton line.

The body 1, which forms the outer frame of the temperature classification valve, is made of non-magnetic material such as plastic, bronze, or aluminum, and has a T-shaped appearance like a kind of three-way valve. The inlet that receives the thermal fluid A with varying temperatures is referred to as the inlet part 2, and the outlet that classifies and discharges the thermal fluid A when the temperature is low is referred to as the outlet part 3.
When the temperature is high, the outflow section 4 is the outflow section 1 which classifies and discharges it.

Then, a large swollen space in the center of the body 1 is used as a response section 5, and the response operation improvement device of the present shape memory alloy is placed inside the response section 5.

An immovable support 6 is erected in the center of the response part 5, and a cylinder 8 and a shaft 7 suitably longer than the cylinder 8 are set so as to be able to slide on each other through the support.

Guide grooves 16 are diagonally carved into both ends of the cylinder 8, and non-magnetic guide grooves 16 are formed at both ends of the shaft 7, such as hemispherical or convex shapes made of plastic or the like. Fix the glue 13.

The magnets 9 and 10, such as disk-shaped or square plates, are set at 180° or 90° so that they can slide along the circumference of the gauging 13.
.

Place one or more pairs at an angle such as 60°.

As shown in Figure 3, the rings 24
Connect with.

The stem 15 is made to protrude from the cylinder 8 from the magnets 9 and 10.

The stem 15 protrudes so as to be rotatable while being held perpendicularly to a sliding guide groove 16 carved into the 8th surface of the cylinder.

Then, as shown in FIG. 2, magnets 11 and 12 of similar size are set at positions on the outside of the casing 13 opposite to the magnets 9 and 10 using a support frame 23 made of plastic or the like.

Also, between the magnet 9 and the magnet 11, and between the magnet IO and the magnet 12
An iron piece 14 made of annealed soft iron or the like is tightly attached to the outside of the casing 13 between the casing 13 and the casing 13 .

Coil sheets 17 and 17' are fixed to appropriate positions slightly inside the guide groove 16 of the cylinder 8, and coil sheets 18 and 18' are also attached to both sides of the column 6. A coil spring 19 made of a shape memory alloy or the like is installed between the coil sheet 18 and the coil sheet 17, and a coil spring 20 is installed between the coil sheet 18' and the coil sheets 1-17'.

A groove 21 is provided in the cylinder 8 to prevent rotational movement when the slidable cylinder 8 makes a sideways forward movement, and a groove 21 is provided in the cylinder 8. Measures will be taken to prevent the movement of 8.

A baffle/distributor 22 is provided at the tip of the support column 6 to moderate the flow velocity of the thermal fluid A from the inflow section 2 within the response section 5 .

Here, the combination of characteristics of the shape memory alloy coil springs is (1) Both the coil springs 19 and 20 are made of bidirectional shape memory alloy. However, at the set temperature for transformation, the operating directions of expansion and contraction during restoration are opposite to each other.

(U) The coil spring 19 is a unidirectional shape memory alloy, and the coil spring 20 is a bias spring that uses normal elastic force.

(2) Both coil springs 19 and 20 are a combination of a unidirectional shape memory alloy and a bias spring that uses normal elastic force. However, at the set temperature for transformation of shape memory alloy,
The expansion and contraction operations are in opposite directions.

Other combinations are possible.

As described below, this shape memory alloy responsive operation improvement device may be used in temperature-based classification valves, but the stem 26 is protruded from the casing 13 to improve forward and reverse stroke operation due to temperature changes. It is also conceivable to use an engine that is taken out to the outside, that is, one portion of the improvement device is used as a driving source.

In this case, by increasing the strength of the magnets 11 and 12, it is possible to obtain a larger output than the stress of the shape memory alloy coil spring.

Also, considering these mechanical features, that is, the magnet 9.1
Instead of the method of changing the mechanical pole position of 9, for example, by inserting a battery or other power source into the support column 6, and winding the wire into a coil so that the gauging section 13 becomes an electromagnet, a shape memory alloy coil spring can be used. If you try to change the number of 10 and - depending on the responsiveness of Naka and Shizu, 1. What is the polarity change of N-8 as a magnet? It is also possible to perform 1'L purely and reliably.

As described above, one aspect of the present invention is a shape memory alloy response operation improvement device that is characterized by combining a shape memory alloy coil spring and a magnet, and improves the response operation of the shape memory alloy to temperature changes.

The operating order of this shape memory alloy response action improvement device.

This will be explained based on FIG. 1 and FIGS. 5 to 7.

Figure 1 can be said to be the original positional relationship diagram.

FIGS. 5 and 6 are diagrams showing intermediate positional relationships in which the shape memory alloy coil bar waste is responding to temperature changes.

FIG. 7 is a diagram showing the positional relationship of the completion.

The operating sequence of a specific embodiment will be described below when applied to a temperature-based classification valve as described above.

As shown in FIG. 1, if the thermal fluid A with temperature variations is supplied to the inflow section 2, the thermal fluid The flow velocity of A is relaxed, and it becomes a quiet fluid with a uniform temperature distribution.

Coil spring 19.2 used in one improvement device
0, if bidirectional shape memory alloys that operate in opposite directions are used, and the set temperature for transformation is both 50°C, that is, when the coil spring 19 is below 50°C. is in a contracted state, and when the temperature is below 50°C, it responds in the stretching direction and returns to the extended state, and when the temperature drops below 50°C, it responds in the shrinking direction and returns to the contracted state. The coil spring 20 is
When the temperature is below 50°C, it is in an elongated state, and when the temperature is above 50°C, it responds in the direction of shrinkage and returns to the contracted state, and when it becomes below 50°C, it responds in the direction of elongation and returns to the extended state.

If these are in use and the thermal fluid A is now being fed at a temperature of 60°C, the coil spring 19 will act in response in the direction of extension, and the coil spring 20 will act in response in the direction of contraction.

The coil sheets 17 and 17' that support the coil springs 19 and 20 are fixed to the cylinder 8, and the cylinder 8 is slidable relative to the stationary support 6, so that the coil springs 19 and 2
The current actuation of 0 results in the cylinder 8 sliding forward to the left.

At that time, if the magnets 9 and 10 supported by the rotatable shaft within the frame of the casing 13 are in the position shown in FIG. The stem 15 protrudes, and if the cylinder 8 moves forward in a skidding state, the guide groove 16 is cut into the circumference of the cylinder 8 diagonally 1], so the magnet 9 connected by the ring 24 ' and 10' are forced to rotate by shaking off the attraction force with magnets 11' and 12'.

With the same operation, the magnets 9 and JO also undergo rotational movement at the same time, and as shown in FIG.

On the other hand, an iron piece 1 made of soft iron or the like is attached to the outer part of the casing 13'.
4' is attached and is attracted by the attractive force of magnets 11' and 12', so casing 13' is not synchronized with the forward movement of cylinder 8 or the rotational movement of magnets 9' and 10'. It remains as it is without moving.

Therefore, in order for these movements to occur with lubrication, it is better for the magnetic force of the magnets to be 11, 12 ≧ 9, 10, and it is desirable that the magnets have strong directionality (different orientations). <, the stress of the shape memory alloy coil spring is the magnet 11
It is necessary to generate enough stress to overcome the attractive force of magnets 9' and 12' and rotate the magnets 9' and 10'.

Further, as the coil spring 19 expands and the coil bye 20 contracts, the tube 8 moves forward to the position shown in FIG.

Magnets 9 and 10 are rotated 180 degrees, and the top and bottom are reversed from the original position. If we look at the movement up to the positional relationship shown in Figure 6 from the relationship between the coil-by-responsiveness of the shape memory alloy and the movement of the casing 3, we can see that the shape memory alloy has a slow initial rise in response to temperature changes. It can be said that the movement has no involvement in the movement of the casing 13, is absorbed by the movement of the cylinder 8, and merely rotates the magnets 9 and 104.

However, this results in a significant change in the relationship between the opposing magnet poles. That is, initially, as shown in FIG.
The relationship between the opposing poles of magnet 11' and magnet 10' and magnet 12' was N:S, but now it becomes S:S or N:N, and the attraction up to that point is Force turns into repulsive force.

The relationship between the other magnets 9 and 11 and magnets 10 and 12 was S:S, N:N, but becomes N:S, and the repulsive force changes to an attractive force.

This means that the stress between the coil springs 19 and 20 of the shape memory alloy magnets is released in a no-load state, and furthermore, the attractive and repulsive forces of the magnetic force are accelerated. Become.

Therefore, the coil spring 19 can be expanded more easily.

The coil spring 20 is easily restored in the direction of contraction, and the casing 13 is rapidly advanced to the restored position shown in FIG. 7, thereby blocking the outflow portion 3.

The outflow portion 4 on the opposite side is in an open state.

Then, the thermal fluid A is recognized as a thermal fluid with a higher temperature than the set temperature for transformation of the shape memory alloy of the coil springs 19 and 20, and is classified into one class and flows out from the outflow portion 4 as a high-temperature thermal fluid C.

Conversely, if the thermal fluid A that is fed is at a low temperature of 40°C, the set temperatures for transformation of the coil springs 19 and 20 are both 50°C.

Showing the opposite response, the coil-by-bow 9 responds in the direction of contraction; Then, the reverse phenomenon described above occurs through the same procedure, the outflow part 4 is blocked by the casing 13', and the thermal fluid A is classified as a low-temperature thermal fluid B below the set temperature for transformation of the shape memory alloy. As,
It flows out from the outflow part 3 which is in an open state.

This also applies to other combinations of coil springs 19 and 20.

It is clear that this will be done accordingly.

In this way, by combining the shape memory alloy coil spring and the magnet, a sharp and steady stroke operation is established, and the temperature of the supplied thermal fluid A varies depending on the temperature. The classification work is done automatically.

As described above, the present invention is a device that improves the functionality of the response operation of a shape memory alloy coil spring to temperature changes by combining a shape memory alloy coil spring with a magnet.

[Brief explanation of the drawing]

Figure 1 shows the response operation improvement device for this shape memory alloy. FIG. 3 is a cross-sectional view when applied to a temperature-based classification valve. It is also a diagram of the initial positional relationship of the response operation. FIG. 2 is a sectional view taken along line a-a'--1 in FIG. 1. FIG. 3 is a sectional view taken along line bb'-11 in FIG. 1. FIG. 4 is a diagram showing the amount of displacement of the shape memory alloy with respect to temperature change. FIGS. 5 and 6 are cross-sectional views showing intermediate positional relationships during operation in response to temperature changes. FIG. 7 is a cross-sectional view showing the positional relationship at the time when the response operation to temperature change is completed. Tokukai Sho GO-50280 (6)

Claims (5)

[Claims] (1) A cylinder and a shaft longer than the cylinder are set so that they can slide against each other by penetrating the column, and guide grooves are cut diagonally into both ends of the cylinder, and hemispherical shapes are formed at both ends of the shaft. etc. to set up the casing. (2) A magnet is placed inside the casing, and the stem protrudes from the magnet so that it can slide and rotate in the guide groove of the cylinder. (3) Set a magnet at the outside position opposite to the magnet inside the casing. In the meantime, attach pieces of iron, etc. to the casing. (4) Coil sheets are fixed at appropriate positions on both sides of the cylinder, and coil springs such as shape memory alloy are set between the coil sheets on both sides around the pillar. (5) A shape memory alloy response operation improvement device characterized by using a shape memory alloy coil spring and a magnet in combination.