JPS6299897A - Constant temperature type spot heat sensor - 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] [Technical Field] The present invention relates to a constant temperature spot type heat sensor, more specifically,
This invention relates to a display for confirming operation in a constant temperature spot type heat sensor that provides a contact output when the temperature exceeds a predetermined temperature.

[Background technology 1 Generally, this type of constant temperature spot type heat sensor is tlS4
As shown in the figure, the contact output from heat sensor A is received and displayed! It is connected to the receiving fiB that notifies the user, and when the receiving fiB does not detect the operation of the heat sensing HA, it is possible that the heat sensor A has been activated due to a fire, or that the heat sensor A has not been activated due to some kind of shock, etc. It is not possible to determine whether device A has operated or not, and it is not possible to determine whether it is a malfunction.

In addition, when multiple heat sensors A are provided,
It is difficult to confirm which heat sensor A is activated by which heat source.

In order to check the operation, it is considered that the operation check lamp LD is connected in series with the contact rl of the heat sensor A, as shown in FIG.
The operation confirmation lamp LD lights up even when αr is closed, and there is a problem in that it is impossible to determine whether it is a malfunction or a normal operation. Also, since the contact r to this type of heat sensor is automatically opened when the temperature drops, which of the multiple heat sensors A was operating in the circuit shown in Figure 5? cannot be confirmed later. In order to check which heat sensor A has operated after a fire has been extinguished, etc., as shown in Figure 6, a commercial power supply AC is connected to a bridge circuit BDr full-wave rectified power supply, an operation check lamp LD and a thyristor SCR are connected. One possibility is to insert a series circuit, connect it in parallel with thyristor SCR, and connect αr so that when this contact r is closed, a date voltage is applied to thyristor SCH.In this circuit configuration, the contact Although the operation check lamp LD remains lit even if contact r is opened after it has been closed, in this circuit configuration as well, malfunction due to impact etc. and fire may occur, similar to the circuit shown in Figure 5. It cannot be distinguished from normal movement.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned points, and its main purpose is to be able to distinguish between malfunction due to impact etc. and normal operation due to fire. An object of the present invention is to provide a constant temperature spot type heat sensor.

[Disclosure 1 of the Invention (Embodiment) As shown in FIGS. 1 and 2, the sensor main body 5 is equipped with a heat-sensitive cord 1 that provides a contact output when a predetermined temperature is reached, and a heat-sensitive element 1 attached to the ceiling surface. It consists of a mounting base 2 that is attached to a mounting surface such as the like.

As shown in FIG. 3, the heat-sensitive element 1 consists of a body 11 made of 4 resin, which is formed into a box shape that is open downward, and a body 1 made of resin.
The interior of the casing 10 is composed of a metal cap 12 that covers the opening and side surfaces of the casing 1, a heat-sensitive response section made of a bimetal 13 that reverses operation when the temperature reaches a predetermined temperature, and a heat-sensitive section that moves when the bimetal 13 is reversed. , α14 and fixed tangent, α
15, and a contact mechanism portion for closing the contact and breakage are housed and formed. The bimetal 13 is formed in a circular shape, and at room temperature it is convex downward in the tjS3 diagram.
It is set so that it inverts and becomes convex upward when it reaches a predetermined temperature. The contact mechanism includes a contact plate 16 having a movable contact 14 at its tip, a driver 17 made of an insulating material, one end of which is fixed to the contact plate 16, and the other 4 parts abut against the center of the bimetal 13. A terminal plate 18 having a fixed contact 15 at one end and protruding outside the casing 10 at the other end is in contact with the terminal plate 18 and is electrically and mechanically connected to the α plate 16 and the other end is connected to the outside of the casing 10. It is composed of a protruding terminal plate 19.

As shown in Fig. 2, the mounting base 2 is formed into a truncated conical cylinder whose diameter decreases at the bottom, and a mounting hole 21 into which a mounting screw is inserted is formed at the upper periphery. There is.

The inside of the mounting base 2 is divided into upper and lower parts by a fixing plate 22.
The lower end surface of the mounting base 2 is open, and the upper end portion of the heat-sensitive element 1 is mounted thereon. Further, a heat collecting plate 23 is attached to the outer periphery of the lower i portion of the mounting base 2, and the heat rays from below the mounting base 2 are collected to the heat-sensitive element 1 mounted in the recess 3. There is. With the thermal element 1 mounted on the lower end of the mounting base 2, the terminal plate 18.19 of the thermal element 1 is connected to the lead #i24.25 drawn into the lower part of the mounting base 2 through the fixing plate 22.
and is connected to an external circuit via leads [24, 25].

M1 layers of elastic plates 26 are arranged on the lower surface of the fixed plate 22.
A part of the elastic plate 26 projects to the upper part of the fixed plate 22 through a through hole formed in the fixed plate 22 for drawing out a lead wire. Therefore, the protruding portion of the elastic plate 26 comes into contact with the circumferential surface of the lead wires 24 and 25, so that the waterproofness of the portion I5 inside the mounting base 2 and below the fixed plate 22 is maintained. Furthermore, resin is poured around the lead wires 24 and 25 to improve waterproofness.

A temperature-indicating sheet 3 coated with temperature-indicating paint is attached to the upper and lower surfaces of the mounting base 2 as an operation confirmation part.When the temperature-indicating paint is heated, it changes color according to the temperature and maintains its color.
It is a type of paint that returns to its original color only when it absorbs moisture at room temperature (paint that does not return to its original color just by cooling, so-called under-mold reversible temperature-indicating paint). There is a temperature-indicating paint that turns bright purple. This temperature-indicating paint is applied to the surface of a circular Tetron film, and an adhesive is applied to the back surface to form a temperature-indicating sheet 3, which is pasted at a suitable location on the mounting frame 2. Here, since adhesive is applied to the temperature-indicating sheet 3 in advance, if the temperature-indicating sheet 3 is supplied with it attached to release paper, etc., the temperature-indicating sheet 3 can be peeled off from the release paper and pasted on the mounting frame 2. By wearing the adhesive, you can perform the adhesion work efficiently.

However, when the temperature-indicating sheet 3 coated with the temperature-indicating paint that changes color at 80°C is attached to the mounting frame 2, when a plurality of heat sensors A are installed as shown in FIG. If only one of them, the temperature indicator sheet 3, is discolored, it becomes clear that only that heat sensor A is activated.
This is useful for investigating the cause of fires. In addition, since the temperature indicator sheet 3 changes color depending on the ambient temperature, if a contact output is obtained to the heat sensor when the temperature indicator sheet 3 does not change color, it can be determined that there is a malfunction. It is easy to distinguish between

Furthermore, even after a fire has been extinguished and the temperature has decreased, it will not return to its original color unless it absorbs moisture, so it has the advantage of being useful in investigating the cause of human disasters after a fire has been extinguished. In the above embodiment, the temperature indicating sheet 3 is attached to the mounting frame 2, but the same effect can be obtained even if the temperature indicating paint is applied directly to the mounting frame 2.

[Effects of the Invention 1] As described above, the present invention is a constant temperature spot type heat sensor that provides a contact output when a predetermined temperature level reaches a predetermined temperature, which changes color depending on the ambient temperature and maintains its color. The operation confirmation part, which is coated with temperature-indicating paint that returns to its original color only when it absorbs moisture at room temperature, is installed in one part of the sensor body, so there is no need to change the electrical or mechanical structure. This has the advantage that an operation confirmation section can be easily installed in an existing heat sensor. In addition, the operation confirmation part changes color depending on the ambient temperature, so if it is connected without generating heat like an impact and α output is obtained, or if it is connected due to a fire, α
This has the advantage that it is possible to distinguish between cases where an output is obtained and whether it is a malfunction or a normal operation. Furthermore, since the work confirmation part is formed by adhering temperature-indicating paint, it has the advantage that it can be formed at low cost.

[Brief explanation of drawings]

Fig. 1 is a lower Eni diagram showing one embodiment of the present invention, and Fig. 2 is a partially cutaway side view of the same. Figure W3 is a cross-sectional view showing the heat-sensitive element used in the above, and Figure 4 shows an example of the use of the constant temperature spot type heat sensor according to the present invention. FIG. 1 is a heat-sensitive element, 2 is a mounting base, 3 is a temperature indicator sheet, and 5 is a main body of the sensor. Agent Patent Attorney Ishi 1) Chief 7, Figure 51, Guest 2, Figure 3, Figure 14, Exit 95X, Tan 6S-

Claims (1)

[Claims] (1) A fixed-temperature spot type heat sensor that provides a contact output when the temperature exceeds a predetermined temperature. It changes color depending on the ambient temperature and retains its color, and returns to its original color only when it absorbs moisture at room temperature. A fixed-temperature spot type heat sensor characterized in that an operation confirmation part to which temperature-indicating paint is attached is provided at one place on the sensor body.