JPH0611817U - Filter - Google Patents

Abstract

(57) [Summary] [Purpose] Despite the fact that the fluid is at low temperature and at high temperature, it obtains a substantially constant permeability, and does not cause clogging of the fluid and fulfills the optimum filtering function. [Structure] The filter body 1 is formed into a shape shown in (B) by braiding a shape-memory alloy wire rod and compression-molding the wire at a high temperature. A compression coil spring 6 is mounted between the large diameter portion 2 at the front end of the filter body 1 and a spring seat 5 fixed at the rear end. While the fluid a has a high viscosity and is at a low temperature, the filter body 1 is expanded and deformed in the axial direction by the elastic force of the compression coil spring 6 to have a low density, as shown in (A). When the temperature of the fluid a becomes low and the temperature becomes high, the filter body 1 contracts to the original shape at the time of molding and becomes a high density due to the characteristics of the shape memory alloy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter that is fitted in a fluid flow pipe and is used for filtering a fluid.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, various types of filters for filtering fluid of this type have been used, which are compression-molded by knitting a fine wire such as a natural material, a synthetic resin or a metal material.

[0003]

[Problems to be solved by the device]

 Conventional filters are formed invariably in density in advance, whereas the viscosity of the fluid to be filtered tends to decrease as the temperature rises, so that it is different when the fluid is hot and when it is cold. Then, the transmittance of the filter is different.

Therefore, for example, when a filter is formed to have a high density suitable for filtering a fluid having a low viscosity and a high temperature, the fluid having a low temperature and a high viscosity has a low transmittance and becomes clogged, and conversely. However, if it is matched with a low temperature fluid, the filtering function of a high temperature fluid may not be fully fulfilled.Therefore, it is necessary to obtain a substantially constant transmittance regardless of whether the fluid is a high temperature or a low temperature. It was hoped that a new type of filter would appear.

[0005]

[Means for Solving the Problems]

 The filter of the present invention has been devised based on such a requirement, and a fine wire made of a shape memory alloy is braided and compression-molded at a high temperature so that it is tightly packed in a fluid flow pipe. A filter main body having a fixed volume that fits in is formed, and an elastic member that expands and deforms the filter main body in the axial direction is attached to the filter main body.

[0006]

[Action]

 Shape memory alloys remember the shape that they remember at high temperatures, and have the property of returning to their original shape when heated to high temperatures even when deformed at low temperatures.

When the filter is fitted into the flow pipe, the filter body is expanded and deformed in the axial direction by the elastic force of the elastic member, and the density is lower than that at the time of molding.

When the circulating fluid has a low temperature, the filter body is expanded and deformed to have a low density, and the fluid flows in the filter body.

When the temperature of the fluid becomes high and the main body of the filter is heated to a high temperature, the main body of the filter is compressed into the original shape at the time of molding due to the elasticity of the elastic member due to the property of the shape memory alloy described above. It becomes the density.

That is, when a high-viscosity fluid flows at a low temperature, the filter body expands and deforms to have a low density. On the other hand, when a high-viscosity fluid at a high temperature lowers, the filter body shrinks to its original shape. The density is high, and the transmittance is almost constant when the temperature of the fluid is high and when it is low, and the transmittance is almost constant.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is a main body of the filter, which is made by shape-measuring a wire material made of a shape memory alloy such as a Ti-Ni alloy, an Ag-Cd alloy or a Cu-Al alloy having a wire diameter of 0.1 to 0.3 mmφ. By performing compression molding at high temperature, as shown in FIG. 1 (B), a large-diameter portion 2 that is tightly fitted to the inner circumference of the filter accommodating tube 3 is provided at one end to form a constant volume. ing.

The above shape memory alloy remembers the shape stored at high temperature and has the property of returning to its original shape when heated to high temperature even if it is deformed at low temperature.

A ring-shaped spring seat 5 is fixed to the filter body 1 by welding at an end of the filter body 1 opposite to the side where the large diameter part 2 is provided. A compression coil spring 6 is fitted between them.

As a result, the filter body 1 is adapted to be expanded and deformed in the axial direction by the elastic force of the compression coil spring 6 at low temperature.

As shown in FIG. 1A, the expanded and deformed filter body 1 is fitted into the filter housing pipe 3, and the large-diameter portion 2 is formed on the front end side of the inward locking collar. 7, a retaining ring 9 with a flange 10 is attached to the rear end of the filter accommodating pipe 3 by screwing a male screw 11 cut on the outer periphery thereof into a female screw 12 cut on the inner periphery of the accommodating pipe 3. The filter main body 1 is attached to the filter housing pipe 3 so as not to come off.

At this time, by changing the screwing amount of the locking ring 9 to change the distance between the front end of the housing tube 3 and the locking collar 7, the mounting dimensions of the filter main body 1 are changed, and the filter main body at low temperature is changed. A density of 1 is adjusted.

The filter accommodating tube 3 has a flange 14 formed at the front end and a flange 10 of the locking ring 9 screwed at the rear end in the middle of the flow tube 16 for flowing the fluid a. Each of them is connected by fastening a screw 18 to a flange 17 formed in the connection port of the flow pipe 16.

The present embodiment has such a structure, and when the fluid a flows in the direction of the arrow and the fluid a is at a low temperature, the filter body 1 remains as-assembled as shown in FIG. 1 (A). That is, in a state in which the density is lowered by expanding and deforming in the axial direction, the fluid a 1 passes through the inside.

When the fluid a reaches a high temperature and the filter main body 1 is heated to a high temperature, the filter main body 1 causes the compression coil spring 6 to move to the compression coil spring 6 due to the property of the shape memory alloy described above. While shrinking, it shrinks to the original shape at the time of molding, resulting in a high density.

That is, when the circulating fluid a has a high viscosity at a low temperature, the filter body 1 expands and deforms to have a low density. On the other hand, at a high temperature where the fluid a has a low viscosity, the filter body 1 contracts to its original shape. The density is high, so that a substantially constant transmittance is obtained when the fluid a is at a high temperature and when it is at a low temperature.

Note that the expansion degree, that is, the density, of the filter main body 1 at low temperature can be adjusted also by appropriately selecting the material of the shape memory alloy forming the filter main body 1 and the spring characteristic of the compression coil spring 6. it can.

[0022]

[Effect of device]

 As described in detail above, according to the present invention, the filter body expands and deforms to have a low density when the circulating fluid has a high viscosity and has a low density, and the filter body returns to its original shape at a high temperature that has a low viscosity. By contracting to a high density, the fluid to be filtered is not affected by high and low temperatures at a high temperature and a low temperature, and a substantially constant transmittance is obtained. Whether the temperature is low or high, there is the effect that the fluid can not be clogged and the optimum filtration function can be achieved.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a case where a low temperature fluid flows.

FIG. 1B is a cross-sectional view showing a case where a high-temperature fluid flows.

[Explanation of symbols]

a: fluid 1: filter main body 2: large diameter part 3: filter housing pipe 5: spring seat 6: compression coil spring (elastic member) 9: locking ring 16:
Distribution pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B01D 46/30 B 7059-4D

Claims (1)

[Scope of utility model registration request] 1. A thin wire made of a shape memory alloy is knitted and compression-molded at a high temperature to form a filter body having a constant volume that is tightly fitted in a fluid flow pipe, and the filter body is provided with A filter having an elastic member for expanding and deforming the filter body in an axial direction.