JPH064640U - Temperature indicator - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a temperature indicator for detecting the temperature rise of an object, which can be used for a long time. [Structure] Heat-conductive container 3 attached to target 9
A shape memory alloy 2 provided in the container 3 to be deformed at a predetermined temperature; and a colored portion 2a and a semitransparent window 4 or a contact 5 which are display means for displaying the temperature due to the deformation of the shape memory alloy 2. Consists of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature indicator for detecting and displaying when the temperature of an object exceeds a predetermined temperature.

[0002]

[Prior art]

 As a conventional temperature indicator, there is a means of attaching a thermo label whose color changes with temperature to an object and knowing the temperature by changing the color.

[0003]

[Problems to be solved by the device]

 Although the conventional temperature indicator is as described above, it has a problem that it fades over time and has a short life.

The present invention has been made to solve the above problems, and an object thereof is to obtain a temperature indicator which can be used for a long period of time.

[0005]

[Means for Solving the Problems]

 A temperature indicator according to the present invention displays a heat-conductive container attached to an object, a shape memory alloy provided in the container that deforms at a predetermined temperature, and the temperature of the shape memory alloy due to the deformation. Display means.

[0006]

[Action]

 In the container of the temperature indicator according to the present invention, when the temperature of the attached object rises, the heat is transferred and the temperature rises. When the temperature of the container rises, the temperature of the shape memory alloy provided in this container also rises. When the temperature of the shape memory alloy rises to a predetermined temperature, the shape memory alloy deforms. When the shape memory alloy is deformed, the display means receives it and displays that the temperature has risen. Thus, this temperature indicator indicates that the temperature of the object has risen to the predetermined temperature.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 2 is a shape memory alloy, and the shape memory alloy 2 is provided in a container 3. A semitransparent window 4 is provided on the front surface of the container 3. The container 3 is attached to an object 9 such as a conductor connecting portion that generates heat by an adhesive or the like. The shape memory alloy 2 is in a shortened state at room temperature as shown in (A), and is deformed to a stretched state as shown in (B) when the temperature exceeds a predetermined temperature. The front surface of the shape memory alloy 2 is colored red to form a red colored surface 2a. The container 3 is made of heat-resistant and weather-resistant plastic or the like, which can transfer heat from the object 9 well, and is preferably an insulating material.

Next, the operation of the embodiment shown in FIG. 1 will be described. When the object 9 is normal, the temperature in the container 3 is room temperature, and the shape memory alloy 2 is in a shortened state as shown in (A). When the inside of the container 3 is viewed through the semitransparent window 4 in this state, the red color of the red-colored surface 2a of the shape memory alloy 2 is hardly visible due to the light scattered by the semitransparent window 4. However, when the object 9 generates heat, the heat is transmitted to the shape memory alloy 2 through the container 3, and when the temperature of the shape memory alloy 2 becomes equal to or higher than a predetermined temperature, the shape memory alloy 2 is generated as shown in (B). Stretched state. Since the red colored surface 2a of the shape memory alloy 2 approaches the semi-transparent window 4, the red colored surface 2a can be seen through the semi-transparent window 4 and it can be seen that the temperature of the object 9 has risen, and some action will be taken. .

Next, a second embodiment shown in FIG. 2 will be described. A contact point 5 is provided at the tip of the shape memory alloy 2, and a contact point 5 is also provided on the inner surface of the container 3 facing the contact point 5. An output terminal 6 is connected to each contact 5. The output terminal 6 is connected to display means or alarm means (not shown). When the object 9 is normal and at room temperature, the shape memory alloy 2 is in a shortened state and the contacts 5 are separated, as shown in the figure. When the object 9 generates heat, the shape memory alloy 2 is stretched and the contacts 5 come into contact with each other. Then, the circuit is closed, and the display or alarm means (not shown) informs that the temperature of the object has risen above a predetermined temperature.

Next, a third embodiment shown in FIG. 3 will be described. This temperature indicator is for high voltage, and in order to provide this temperature indicator at a position distant from the object 9, the container 3 is attached via the heat transfer material container 33 containing the heat transfer material 8 The memory alloy 2 is provided with a heat sensitive portion 7. The heat transfer material 8 and the heat transfer material container 33 have good insulating properties, and the heat transfer material 8 has good heat transfer properties. Means as shown in FIGS. 1 and 2 are provided as the display means. When the object 9 generates heat, heat is transferred to the shape memory alloy 2 via the heat transfer material 8, the shape memory alloy 2 is stretched, and the display or alarm means operates, as described above.

[0011]

[Effect of device]

 As described above, according to the present invention, since the shape memory alloy is used, a semi-permanent temperature indicator can be obtained.

[Brief description of drawings]

1 shows a temperature indicator according to a first embodiment of the present invention, (A) is a sectional view in a normal state, and (B) is a sectional view in a heat generating state.

FIG. 2 is a sectional view of a temperature indicator according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a temperature indicator according to a third embodiment of the present invention.

[Explanation of symbols]

2: Shape memory alloy, 2a: Red colored surface, 3: Container,
4: translucent window, 5: contact point, 7: heat sensitive part,
8: Heat transfer material, 9: Object. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A heat transfer container attached to an object, a shape memory alloy provided in the container that deforms at a predetermined temperature, and a display unit that displays a temperature by the deformation of the shape memory alloy. A temperature indicator characterized by: