JPS59225075A - Thermal actuator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal actuator using a shape memory alloy, and a suitable application thereof is a fire and smoke damper used in air conditioning or ventilation ducts.

As an example of using shape memory alloy for the opening/closing adjustment of Dan Gu etc., Public Utility Model Publication No. 57-61429,
There are No. 57-12564 and No. 57-12565.

In all of these methods, the shape memory alloy itself or a member rigidly fixed to the shape memory alloy is used as the opening/closing member of the damper, but with this method, it is difficult to obtain a large opening/closing angle of the damper. Furthermore, the shape memory alloy itself needs to be large-sized, making it extremely expensive. Furthermore, since the damper itself is consumable, repair costs become extremely high. Therefore, it is difficult to use as an emergency damper for general air conditioning equipment, and cannot handle thick A wind.

An object of the present invention is to provide a thermal actuator that does not have the above-mentioned drawbacks and can be used in a wide range of applications.

Another object of the present invention is to provide a thermal actuator assembly that can be directly installed and operated at a desired location.

A thermal actuator assembly according to an embodiment of the present invention includes a frame, a bottle slidable within the frame, a spring for holding the bottle in an extended position, and a spring coupled between the rear end of the bottle and the frame to maintain a predetermined temperature. and a shape memory alloy member that allows the bottle to be retracted against the spring by its shape recovery behavior when the bottle exceeds the spring.

Since this thermal actuator assembly is assembled by setting the spring and the acting force of the shape memory alloy member in advance,
It can be installed and used directly at the required location.

Embodiments and drawings illustrating the present invention will be described.

FIG. 1 shows an example in which the thermal actuator according to the present invention is used in a fire damper. The fire damper has a damper casing 1 in which a shaft 2 is rotatably supported by a bearing 3. A damper blade (not shown) is fixed to the damper shaft 2 within the duct ξ4 of the casing 1. Casing 1
Fix the Dan i4 11112 Nile Par 5 that protrudes outward. Lever-5KJ! Arrived bottle 6 and casing 1
A tension spring 8 is engaged between the bottle 7 fixed to the outer wall of the
A force is applied to the lever 5 in the closing direction.

A frame 10 is attached to the casing 1 to hold the lever 5 in the open position shown. A lock bin 11 is movably engaged within the frame 10, and a head 13 of the lock bin 110 is projected outside the casing 1 by a bias spring 12. The furanone 14 of the bottle 11 prevents the bottle from being removed and is subjected to the pressure of the splash 12. The head 13 of the bottle 11 is inserted into the hole 15 of the lever 5, and the lever 5 is held in the open position.

According to the invention, a shape memory alloy member 17 is engaged between the left end of the frame 10 and the hole 16 at the rear end of the bin 11.

The shape memory alloy member 17 does not apply a tensile force to the bottle 11 at room temperature, but when the temperature exceeds a predetermined value, it performs a shape recovery behavior that moves the bottle 11 to the left against the force of the spring 12. It is determined as follows.

The frame 10, the pin 11, the spring 12, and the shape memory alloy member 17 form a thermal actuator assembly 20 according to the present invention.

The lever 5 maintains the open position shown in the figure when the fire protection chamber is at room temperature, for example, at the outside temperature during ventilation, or when a predetermined low or high temperature air flow during cooling or heating flows through the duct 4. The shape memory alloy member 17 is not deformed and the head 13 of the bottle 11 is in the hole 15 of the lever 5.

In an emergency, if the airflow temperature in the duct 4 rises and exceeds a predetermined value, the shape memory alloy member 17 performs a shape recovery behavior and repels the bottle 11, reducing the pressing force of the pin head 13 and the hole in the lever 5. The bottle 11 is moved to the left against the frictional force between the bottle 11 and the bottle 15, and the bottle 11 is separated from the hole 15. The lever 5 moves into the closed position under the force of the spring 18, and the damper vane fixed to the damper i4-shaft 2 closes the duct 4. To return the damper to the open position, after the inside of the duct 4 has cooled and the necessary inspections have been made, the lever 5 is manually moved to the open position and the protruding bottle 11 is engaged with the hole 15.

The thermal actuator assembly 20 according to the present invention includes a frame 10, pins 11 . Spring 12, shape memory alloy member 1
It is an independent assembly consisting of 7 parts.

Therefore, it is extremely easy to set the difference between the force of the spring 12 and the force during the shape recovery behavior of the shape memory alloy member 17, resulting in a simple and reliable thermal actuator. This assembly can be used not only for the fire protection Dan/f-operation shown, but also for a variety of other applications.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a thermal actuator according to the present invention combined with a fire damper, and FIG. 2 is a partial end view of FIG. 1. 1... Damper 4-casing, 2... Damper shaft,
4...Tact, 5...Lever, 8...Spring, 10
...Frame, 11...Bin, 12...Spring, 1
7... Shape memory alloy member, 20... Thermal actuator assembly.

Claims (1)

[Claims] rlJ A thermal device characterized in that when the temperature of surrounding gas exceeds a set value, an unlocking device is activated by the shape recovery behavior of a shape memory alloy member installed in contact with this gas. actuator. A frame, a pin that can move inside the frame (1!), a spring that holds the pin in the protruding position, and a shape recovery behavior when the pin is connected between the rear end of the pin and the frame when it exceeds a predetermined temperature. The thermal actuator according to claim 1, characterized in that the thermal actuator assembly includes a shape memory alloy member that allows the pin to be retracted against a spring. (3) Damper blade attachment damper of a fire prevention damper.・In a device in which a 9-shaft operating lever is biased toward the closed position by a tension spring, the thermal actuator assembly is attached to a Dan/Yaichi cage/g, and the protruding end of the pin is engaged with the operating lever to open. The thermal actuator according to claim 2, characterized in that the shape memory alloy member is held in position and exposed within the damper duct.