JPH0491618A - Overheat detector - Google Patents

Abstract

PURPOSE:To sustain performance for a long term and to realize free arrangement of sensor by a constitution wherein previously stored mechanical energy is discharged, upon deformation of an object in a temperature detector, and a sound is produced and received by a remote sound receiver which then converts the sound into an electric signal for detecting overheat. CONSTITUTION:Upon temperature rise over a set level, a bimetal 1a is inverted and an operational pin 1b responds to be pushed out of a temperature detector 1. Consequently, an actuating lever 2d rotates counterclockwise around a fixed shaft 2h and disenaged from the deceleration rotary blade 2c of a music box. As a result, the deceleration rotary blade 2c is rotated with a power supply 2a to operate a drum and a vibration board 2b thus producing sound. The sound is sensed by a microphone in a sound receiver located while being separated by longer than a predetermined distance from the temperature monitoring point and then converted into an electric signal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to power receiving and distribution equipment that is constantly energized or under high electric field/high magnetic field environments such as current flowing. The present invention relates to a device for detecting overheating of a main circuit conductive part.

[Conventional technology]

Figure 6 is a sectional view showing an example of application of a conventional overheat detection device to a closed switchboard. Circuit conductive part (
(8) is an odor generating device that generates an odor when the temperature exceeds a certain set temperature; This is an odor sensing device that detects the odor generated from the odor generating device (5) installed at the bottom, and the figure shows an example where it is installed at the top of the closed switchboard.

FIG. 7 is a cross-sectional view showing details of the odor generating device (5) attached to the temperature monitored part (8), and in the figure, (
8) is a temperature monitored part such as a main circuit conductive part of a closed switchboard, and (5e) is a housing of an odor generating device (5) having at least one side with multiple holes to facilitate odor diffusion. ,
(6) is a substance that is filled inside the housing (5e) of the odor generating device (5) and generates an odor when the temperature exceeds a certain set temperature.

FIG. 8 is a perspective view of the odor generating device (5), and FIG. 9 is a perspective view of the odor sensing device (7) that detects the odor generated from the odor generating device (5).

Fig. 1O is an operational block diagram of the odor sensing device (7). There is an odor detection sensor to be converted, and (7b) is a block-configured circuit for converting the output of the odor detection sensor (7a) into a contact output.

Next, the operation will be explained. As the temperature of the temperature monitored part (8) rises, the inside of the odor generating device (5) also rises, and when the temperature rises above a certain set temperature, odor is emitted from the odor generating substance (6) filled inside. The odor is then diffused to the upper or lower part of the outside through the multi-hole opening of the housing (5e) of the odor generating device.

Next, the odor diffused to the upper or lower part of the outside of the odor generating device (5) is separated from the temperature monitoring area (8) and is detected by an odor sensor attached to the upper or lower part of the odor generating device (5). The odor detection sensor (7a) inside the device (7) detects the odor, converts it into an electrical signal, and outputs it as an operation of the overheat detection contact by the detection/judgment circuit (7b).

(Problem to be solved by the invention) Since the conventional overheating detection device is configured as described above, it is possible to prevent deterioration of the odor-generating substance (6) and odor detection sensor (7).
There are problems such as a) deterioration of detection sensitivity due to surface contamination, etc., making it impossible to maintain stable long-term performance and requiring early replacement, that is, the service life is short.

In addition, since overheating is detected using odor as a medium, an odor detection device (
7) There was a problem that the arrangement was limited.

This invention was made to solve the above-mentioned problems, and aims to provide an overheat detection device that can maintain long-term performance and is not limited in the arrangement of the sensing device.

[Means to solve the problem]

The overheating detection device according to the present invention includes a temperature detection device that operates at a temperature higher than a set temperature in a temperature monitored region, and a sound generating device that generates a sound due to the operation thereof, and is arranged at a distance from the temperature monitored region. It also includes a sound receiving device that receives the sound generated from the sound generating device.

[Effect]

The overheat detection device according to the present invention generates a sound by releasing energy that has been mechanically stored in advance by deforming the object inside the temperature detection device when the temperature exceeds a certain set temperature. A sound receiving device receives the generated sound, converts it into an electrical signal, and detects overheating.

[Embodiments of the invention]

An embodiment of this invention will be described below. FIG. 1 is a sectional view showing an example of application of the overheat detection device of the present invention to a closed switchboard. It includes a temperature detection device (1) attached to the circuit conductive part (8) that deforms when the temperature exceeds a certain set temperature, and a sound generating device (4) that generates sound by the deformation, and (4) the main circuit conductive part ( 8) is a sound receiving device that receives the sound generated from the sound generating device (2).

Figure 2 shows the engagement between the inside of the temperature detection device (1) attached to the temperature monitored part (8) and the sound generation device (2) in the case where bimetal is applied as the temperature detection device (1). In the figure, (8) is a temperature monitored part such as a main circuit conductive part of a closed switchboard, (l
a) is a bimetal that deforms above a certain set temperature, (1
b) is the operating pin that operates when the bimetal (la) is deformed, and (IC) is the operating pin (IC) that operates when the bimetal (la) is deformed.
1b) is a retaining spring that prevents malfunction due to gravity or vibration;
(ld) is a housing of the temperature detection device. In addition, (2) is a sound generating device that is attached to cover the temperature detection device (1), and (2d) is an activation lever that operates in conjunction with the operation of the operation pin of the temperature detection device (2e). l
b) It is a twisting spring that biases the activation lever (2d) in the direction of contacting the activation lever (2d).

FIG. 3 is a perspective view showing the internal structure of a music box as an example of the sound generating device (2).

In the figure, (2a) is a spring-type power source for storing mechanical energy in the music box, and (2b) is the music box's diaphragm and drum for generating sound.
Similar to (2b), C) is a rotating blade for decelerating the music box, and is also engaged with the starting lever (2e), which is also a switch for starting and stopping the music box. Further, (2f) is a casing of the sound generating device (2), and (3) is a spring screw used when storing mechanical energy of a spring-type power source.

FIG. 4 is a perspective view showing the appearance of a sound receiving device (4) that receives the sound generated by the sound generating device (2), and FIG. 5 is an operational block of the sound receiving device (4). . In the figure, (4
a) is a microphone that detects the sound generated by the sound generator (2) and converts it into an electrical signal; (4b) is a microphone (
Amplifier A (4C) amplifies the output signal of amplifier A (4a), and bandpass filter (4C) removes noise other than the frequency of the sound generated by sound generator (2) from the output of amplifier A (4b).
4d) is an amplifier B that amplifies the output of the band pass filter (4C), (4e) is a timer that outputs an output signal after confirming that the output of the amplifier B (4d) continues for a certain set time or more;
(4f) is a relay that outputs the output of the timer (4e) as a contact to the outside of the sound receiving device (4).

Next, the operation will be explained. As the temperature of the part to be monitored rises, the inside of the temperature detection device (1) similarly rises, and when the temperature rises above a certain set temperature, the bimetal (1a) reverses and enters the state (1g) in Figure 2, and the operating pin (lb)
responds in the direction in which it is pushed out from the temperature sensing device (1).

The sound generator (2) must be installed with the mainspring screw (3) in advance.
, the spring-type power source (2a) is in the stored state, and the music box is in the deceleration rotary vane (2C) or activation lever (2d).
The rotation is stopped and no sound is generated, and the operating pin (1b) inside the temperature detection device (1)
In response to the movement of the start lever (2d) or fixed shaft (2h)
It rotates counterclockwise in FIG. 2 around , and is disengaged from the music box's deceleration rotating blade (2C). As a result, the power source (2a) rotates the deceleration rotating blade (2C) of the music box, and the operation of the drum and diaphragm (2b) generates sound.

Next, the generated sound is sensed by a microphone (4a) inside the sound receiving device (4), which is placed at least a predetermined insulation distance from the temperature monitoring part (9), and is converted into an electrical signal. Furthermore, the output electric signal is amplified by amplifier A (4b), amplifier B (4d), and band pass filter (4C), and only the sound generated from the sound generator (2) is amplified, and the amplified signal is used to prevent malfunction. Therefore, after the timer (4e) confirms the continuation for a certain set time or more, the relay (4f) outputs the signal to the outside of the sound receiving device (4) as an operation of the overheat detection contact.

In the above embodiment, the temperature detection device (1) is composed of a bimetal (la) that deforms at a certain set temperature, an operating pin (lb) that cooperates with the bimetal (la), and a holding spring (IC). However, it may also be constructed from a single component with operating characteristics similar to a shape memory alloy.

Also, a music box is used as a sound generator,
Other devices that convert mechanical energy into sound may also be used, such as a bell.

In addition, in the above embodiment, the high magnetic field and high electric field parts such as the main circuit conductive parts of the closed switchboard are the parts to be monitored for temperature, but this overheat detection device is installed in parts where the temperature cannot be directly monitored and where there is a risk of temperature rise. Even if applied, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the temperature detecting device (1) that operates at a temperature higher than the set temperature in the temperature monitored area and the sound generating device (2) that generates sound by its operation are installed, and the The structure is equipped with a sound receiving device (4) that is placed away from the monitoring part (9) and receives the sound generated from the sound generating device (2), so it has high long-term reliability and does not spread in all directions. Since overheating is detected using reverberating sound as a medium, the sound receiving device (4) can be freely arranged.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a sectional view when applied to a closed switchboard, Figure 2 being a sectional view showing a temperature detection device and a sound generating device, and Figure 3 4 is a perspective view showing the internal structure of the sound generating device (music box), FIG. 4 is a perspective view of the sound receiving device, and FIG. 5 is an operational block diagram of the sound receiving device. 6 to 10 show conventional examples, FIG. 6 is a sectional view when applied to a closed switchboard, FIG. 7 is a sectional view showing the odor generating device, and FIG. 8 is a perspective view of the odor generating device. 9 is a perspective view of the odor sensing device, and FIG. 10 is an operational block diagram of the odor sensing device. In the figure, (2) is a sound generator, (4) is a sound receiver,
(8) is the main circuit charging section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A temperature detecting device that operates at a predetermined temperature and a sound generating device that generates a sound by releasing pre-stored mechanical energy by operation of the temperature detecting device are attached to the temperature monitored part, An overheat detection device characterized by comprising a sound receiving device that is placed apart from a monitoring site and that receives sound generated from the sound generating device.