JPS6030499A - Fan - Google Patents

Abstract

PURPOSE:To have automatic alteration of the wind quantity and speed according to the change in temperature using a simple construction, by forming at least part of the construction from a bi-directional shape memory alloy so that any temp. change of the suction or exhaust gas causes corresponding alteration of the torsional angle. CONSTITUTION:Vanes 2 installed on a boss 1 solidly are made of a shape memory alloy such as NiTi alloy, and the shape of each vane 2 is altered automatically as shown by the solid and dot-and-dash lines according to the temp. of the wind blowing against it so that its torsional angle is adjusted. The temp. when the shapes shall be altered is so arranged to be equal for all vanes 2, and the amount of torsional angle alteration and its direction also be equal for all vanes 2. This will provide alteration of the torsional angle, i.e. of wind quantity, according to the temp. change by a simple construction at a low cost without requiring equipment of any temp. sensor or voltage controller.

Description

[Detailed description of the invention] This invention relates to a fan.

Conventionally, the blades of intake/exhaust fans for cooling/heating equipment, coolers, radiators, heaters, etc. are made of metal or resin, but the twist angle is usually fixed and cannot be changed. It has become. Therefore, the number of rotations of the blades is changed to change the air volume and wind speed in accordance with changes in the temperature of intake air and exhaust air.

In this case, secondary means such as a temperature sensor and a motor voltage control device or a pole number switch are required, which poses problems of complicating the structure and increasing costs.

The purpose of this invention is to solve the above-mentioned conventional problems and improve the air volume and
To provide a fan capable of automatically changing speed according to temperature changes with an extremely simple structure.

In the fan of the present invention, at least a portion of the blade is made of a bidirectional shape memory alloy so that the twist angle changes depending on changes in intake or exhaust temperature.

When the twist angle is increased (decreased), the intake volume and exhaust volume also decrease.
The wind speed also increases (decreases), but in this invention, the twist p angle is increased (decreased) due to a rise (decrease) in temperature, and the twist angle is increased (decreased) due to a decrease (increase) in temperature.
This includes both cases where

A first embodiment of this invention will be explained based on FIG. Each of the plurality of blades 2 integrally connected to the boss 1 is made entirely of a shape memory alloy made of NiTi alloy, etc., and its twist angle changes depending on the temperature of the louse that hits the blade 2. The shape of the blade 2 changes automatically as shown by the solid line and the chain line. The temperature at which this shape changes is the same for all blades 2, and the amount and direction of change in the twist angle are also the same for all blades 2. This embodiment has the advantage that the overall shape is simpler than that of the second embodiment described later.

Note that the number of blades 2 is arbitrary, such as three or four.

A second embodiment of the invention will be described with reference to FIG.

Only the base 2a of each blade 20 that is directly connected to the post 1 is made of a shape memory alloy, and the remaining part 2b of the blade 2 is made of the same metal or resin as the conventional one. The base portion 2a is fixed to a connecting device 3 such as a repeater or a bolt or nut, or to an adhesive, welding, or the like. The pond is the same as in the first embodiment. In the case of the second embodiment, there is an advantage that the cost can be reduced because the amount of shape memory alloy used is small.

According to the fan of the present invention, temperature sensors, IE pressure control devices, etc. are not required, and the automatic change of the twist p angle and the change of the air volume according to temperature changes can be realized economically with an extremely simple structure. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a first embodiment of the invention, and FIG. 2 is a perspective view of a second embodiment. 2... To the blade - Σ C Figure 2〉2 '2 ・2 a b

Claims (1)

[Claims] A fan in which at least a portion of a blade is made of a bidirectional shape memory alloy so that the twist angle changes depending on changes in intake or exhaust temperature.