JP2023177647A - Abnormal heating detection system - Google Patents

Abstract

To provide an abnormal heating detection system that does not require a temperature sensor and a potential difference circuit and is capable of detecting occurrence of abnormal heating with a single sensor even if there are multiple target portions being monitored.SOLUTION: In an abnormal heating detection system, a resin body 1 with a heat resistance temperature lower than that of a resin housing of an electric device 10 is disposed in close contact with or in the vicinity of a target portion M of the electric device 10. The abnormal heating detection system includes: a gas sensor 2 which is arranged in a specific closed space A common with the resin body 1 and detects gas that is discharged from the resin body 1 by being overheated by heat generation of the target portion M; and a signal output unit 3 which outputs a predetermined signal when the gas ensor 2 has performed a detecting operation.SELECTED DRAWING: Figure 1

Description

The present invention relates to an abnormal heat generation detection system that detects abnormal heat generation in a specific part of an electrical device.

BACKGROUND ART Electrical equipment, such as power outlets to which power plugs are connected, may generate heat and cause a fire if a poor connection or tracking discharge occurs, so some devices are equipped with a function to detect heat generation. For example, in Patent Document 1, a temperature sensor is arranged near the blade receiving spring, and when the detected temperature exceeds a specified temperature, the notification unit is activated to notify.
Also, some circuit breakers are equipped with a function to detect heat generation at the connection terminals, since a faulty connection between the connection terminals may generate heat and lead to a fire. For example, in Patent Document 2, a connection failure of a power supply side terminal is determined from the magnitude of a voltage drop at a connecting terminal, and a circuit breaker is operated to interrupt when the voltage drop exceeds a certain value.

JP 2021-015734 Publication Japanese Patent Application Publication No. 2010-176988

The conventional technology for detecting abnormal heat generation described above makes a judgment based on the temperature of the detection target region or the amount of voltage drop. Therefore, when making decisions based on temperature, it is necessary to attach a temperature sensor to the heat generating part, and it is necessary to change the design to a dedicated structure. Furthermore, it is necessary to attach a temperature sensor to each part to be detected, and the number of temperature sensors required is equal to the number of parts to be monitored.
Further, the configuration in which the determination is made based on the amount of voltage drop requires a complicated determination circuit in addition to connecting wiring to the connection terminal to measure the potential difference, resulting in an expensive configuration.

Therefore, in view of these problems, the present invention provides an abnormal heat generation detection system that does not require a temperature sensor and a potential difference determination circuit, and can detect the occurrence of abnormal heat generation with a single sensor even if there are multiple parts to be monitored. is intended to provide.

In order to solve the above problem, the abnormal heat generation detection system according to the invention of claim 1 tightly adheres a resin body having a heat resistance temperature that is the same as or lower than the heat resistance temperature of the resin housing of the electrical equipment to the monitored part of the electrical equipment. Alternatively, a gas sensor is placed in close proximity to the resin body and placed in a specific closed space common to the resin body, and detects gas emitted from the resin body when it is overheated by the heat generated by the monitored part. The device is characterized in that it has a signal output section that outputs a predetermined signal when activated.
According to this configuration, it is only necessary to arrange the resin body in the monitoring target part, and there is no need for a temperature sensor or the like to be brought into close contact with it, so that abnormal heat generation can be detected with a simple configuration. Furthermore, since the gas sensor detects a specific gas in the air, it does not need to be installed near the monitored part, and there is no need to make major changes to the configuration of the monitored part and the surrounding layout.
Further, even if there are a plurality of parts to be monitored and a plurality of resin bodies are installed, abnormal heat generation can be detected with a single gas sensor within a certain closed space, and detection can be performed with a small number of members. Further, by using a signal output in response to the occurrence of abnormal heat generation, it is possible to make a notification, cut off an electric circuit, etc., and prevent the continuation of heat generation.
In addition, the heat resistance temperature of the resin body is lower than that of the housing, so the resin body closest to the monitored area generates gas before the housing, making it possible to detect abnormal heat generation before the housing deforms due to heat generation. .

The invention according to claim 2 is the configuration according to claim 1, in which the monitored part is an electrical connection part of at least one circuit breaker assembled in a distribution board, and the resin body is an electrical connection part of the circuit breaker. In addition, one gas sensor and a signal output part are installed in the housing of the distribution board, and the master breaker, which is one of the circuit breakers assembled in the distribution board, is shut off by a predetermined signal. It is characterized in that it has a signal input section that operates, and when the gas sensor detects a detection operation, the main breaker operates to interrupt the operation.
According to this configuration, when the gas sensor performs a detection operation regardless of the number of resin bodies, the main breaker performs a cutoff operation. Therefore, even if a plurality of resin bodies are attached, abnormal overheating can be monitored with one gas sensor, and the electric circuit is cut off in response to the occurrence of abnormal heat generation, thereby preventing the abnormal overheating from continuing.
Furthermore, since the gas sensor is located within the distribution board, the gas sensor can detect even a small amount of gas generated, and can reliably detect abnormal heat generation.

The invention according to claim 3 is the configuration according to claim 1, in which the monitored part is an electrical connection part of a circuit breaker assembled in a distribution board, and the resin body is an electrical connection part of at least one electrical circuit breaker of the circuit breaker. The present invention is characterized in that one gas sensor and a signal output section are installed in the housing of the distribution board, and further includes an alarm section that issues an alarm based on a predetermined signal output from the signal output section.
According to this configuration, the alarm unit issues an alarm when the gas sensor performs a detection operation regardless of the number of resin bodies. Therefore, even if a plurality of resin bodies are attached, the occurrence of abnormal heat generation can be recognized with one gas sensor.
Furthermore, since the gas sensor is located within the distribution board, the gas sensor can detect even a small amount of gas generated, and can reliably detect abnormal heat generation.

According to a fourth aspect of the present invention, in the configuration according to claim 1, the monitored part is a blade receiving spring of an outlet to which a plug is connected, and a resin body is disposed on the blade receiving spring, and a resin body is disposed in the housing of the outlet. Alternatively, the gas sensor and the signal output unit are housed in a switch box in which the outlet is housed, and is further provided with an electric circuit cutoff unit that operates to cut off the power supply side electric line that supplies electricity to the outlet in response to a predetermined signal. It is characterized in that the cut-off part performs a cut-off operation.
According to this configuration, if abnormal heat generation occurs in the outlet, the electric circuit is cut off, so that heat generation can be reliably eliminated. Further, since the gas sensor is disposed in the housing of the outlet or the switch box housing the outlet, the gas sensor can detect even a small amount of gas generated, and abnormal heat generation can be reliably detected.

According to a fifth aspect of the invention, in the configuration according to claim 1, the monitored part is a blade receiving spring of an outlet to which a plug is connected, and a resin body is disposed on the blade receiving spring, and a resin body is disposed in the housing of the outlet. Alternatively, the gas sensor and the signal output section are housed in a switch box in which the outlet is housed, and further includes an alarm section that issues an alarm in response to a predetermined signal.
According to this configuration, an alarm sound is emitted when abnormal heat generation occurs in the outlet, so that the occurrence of abnormal heat generation can be recognized. Further, since the gas sensor is disposed in the housing of the outlet or the switch box housing the outlet, the gas sensor can detect even a small amount of gas generated, and abnormal heat generation can be reliably detected.

According to the present invention, it is only necessary to arrange a resin body in the monitoring target part, and there is no need for a temperature sensor or the like to be brought into close contact with the monitoring target part, so that abnormal heat generation can be detected with a simple configuration. Further, since the gas sensor detects a specific gas in the air, it does not need to be installed near the monitored part, and there is no need to make major changes to the configuration of the monitored part and the surrounding layout.
Furthermore, even if there are a plurality of parts to be monitored and a plurality of resin bodies are installed, abnormal heat generation can be detected with a single gas sensor within a certain space, and can be detected with a small number of members. Further, by using a signal output in response to the occurrence of abnormal heat generation, it is possible to make a notification, cut off an electric circuit, etc., and prevent the continuation of heat generation. In addition, since the heat resistance temperature of the resin body is lower than that of the housing, the resin body closest to the monitored area generates gas before the housing, making it possible to detect abnormal heat generation before the housing deforms due to heat generation. .

1 is a schematic diagram of an abnormal heat generation detection system according to the present invention. FIG. 2 is a configuration diagram of a distribution board showing a case where the abnormal heat generation detection system is applied to a circuit breaker of the distribution board. 1 is a configuration diagram of an outlet showing a case where the abnormal heat generation detection system is applied to the outlet, in which (a) is a front view of the outlet, and (b) is an explanatory diagram of the internal structure.

Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of an abnormal heat generation detection system according to the present invention, showing a configuration for monitoring heat generation in a specific part of an electrical device and detecting abnormal heat generation when it occurs.
In FIG. 1, reference numeral 1 denotes a resin body, and 10 denotes an electrical device including a monitoring target part M, which is a part for monitoring abnormal heat generation, and the resin body 1 is attached to the monitoring target part M. Further, 2 is a gas sensor that detects gas generated from the resin body 1, and 3 is a signal output section that outputs a signal (predetermined signal) in response to the detection operation of the gas sensor 2. Here, a gas sensor 2 and a signal output section 3 are incorporated into an electrical device 10.

Reference numeral 4 designates an electrical circuit interrupting unit that performs a circuit interrupting operation based on the output signal of the signal output unit 3, and 5 represents an alarm unit that issues an alarm based on the output signal of the signal output unit 3. It is connected to the. These are installed in a closed space A consisting of a specific housing or room in which the electrical equipment 10 is housed.
The electric circuit interrupting unit 4 is installed in the middle of an electric line L arranged from a power source 7 such as a commercial power source to the electrical equipment 10, and opens (cuts off) a contact part 4a provided in the electric line L. It is composed of a blocking section 4b.

Note that the gas sensor 2 and the signal output unit 3 may also be arranged outside the electrical equipment 10 as long as it is inside the closed space A, instead of inside the electrical equipment 10. Conversely, the circuit interrupter 4 and the alarm unit 5 may also be incorporated into the electrical equipment 10 together with the gas sensor 2 and the signal output unit 3.

The monitored part M is, for example, a connection terminal to which an electric line L is connected, and when abnormal heat generation occurs in the monitored part M due to loosening of screws, the attached resin body 1 softens and generates carbon monoxide or dioxide. A gas such as carbon is generated, and the gas sensor 2 detects it.
The gas sensor 2 is a known gas sensor that detects gases such as carbon monoxide gas and carbon dioxide gas. When the gas sensor 2 detects gas, the signal output section 3 recognizes it and outputs a predetermined signal. For example, if this predetermined signal is a cutoff signal that causes the circuit cutoff unit 4 to perform a cutoff operation, the supply of power to the monitored part M is stopped, and if this predetermined signal is an alarm activation signal, the alarm unit 5 operates to issue an alarm. The occurrence of abnormal heat generation is then notified to the surrounding area.

Here, the resin body 1 will be explained. For the resin body, a resin having a heat resistance temperature lower than that of the mold resin (housing) surrounding the monitored part M is used, and for example, thermoplastic resin such as nylon 6 (PA6) or polybutylene terephthalate (PBT) is used. Thermosetting resins such as urea resin (UF) can also be used. When these resins are heated and softened, they release carbon monoxide gas or carbon dioxide gas.
Furthermore, by selecting resins with different characteristics such as those with a heat resistance temperature of 70°C or 100°C, the detection temperature of the generated heat can be changed, making it possible to Selected based on set temperature.
For example, if the housing of the electrical device 10 to be detected is made of phenolic resin, the resin body 1 may be made of PA6.While the heat-resistant temperature of phenol resin is 150°C to 180°C, the heat-resistant temperature of PA6 is 80°C. ℃, the resin body 1 reliably generates gas below the heat-resistant temperature of the housing, so it is effective for detecting heat generation.

The gas sensor 2, the signal output section 3, and the alarm section 5 are supplied with power from a power supply section (not shown) of the electric device 10. Further, the alarm section 5 has a built-in power storage means (not shown), and can issue an alarm for a certain period of time even if the power to the electrical device 10 is cut off. Further, power is normally supplied from the signal output section 3 via the signal line L2.

In this way, it is only necessary to arrange the resin body 1 on the monitored part M, and there is no need to bring a temperature sensor or the like into close contact with it, so that abnormal heat generation can be detected with a simple configuration. Moreover, since the gas sensor 2 detects a specific gas in the air, it does not need to be installed near the monitored part M, and there is no need to make major changes to the configuration of the monitored part M and the layout of its surroundings.
Furthermore, even if there are a plurality of parts M to be monitored and a plurality of resin bodies 1 are installed, abnormal heat generation can be detected with one gas sensor 2 within a certain space, and can be detected with a small number of members.
By using the signal output in response to the occurrence of abnormal heat generation, it is possible to perform notifications, cut off electrical circuits, etc., and prevent the continuation of heat generation.

FIG. 2 is a configuration diagram of a distribution board, and shows a case where the abnormal heat generation detection system described above is applied to a branch breaker (circuit breaker) of the distribution board. In FIG. 2, 11 is a main breaker, and 12 is a branch breaker. Power (commercial power) is supplied to each branch breaker 12 via the main breaker 11 via the electric line L, and power is further supplied to a load (not shown) via the branch breaker 12.
Here, the resin body 1 is attached to the load side terminal 12b of each branch breaker 12, and the load side terminal 12b is the part M to be monitored. The gas sensor 2, the signal output section 3, and the alarm section 5 are assembled in the housing 15 of the distribution board 14 that forms the closed space A.

The master breaker 11 also includes an external control terminal (signal input section) 11a, and is configured to perform a breaking operation in response to an external signal. Here, the signal output section 3 outputs a signal to perform the shutoff operation, and the alarm section 5 issues an alarm sound.

Note that 12a indicates a power supply side terminal of the branch breaker 12, and if it is desired to detect heat generation in addition to the monitored part M, the resin body 1 is also placed on the power supply side terminal 12a. Furthermore, if the connection terminal of the main breaker 11 is also to be monitored part M, the resin body 1 may be installed at the connection terminal of the main breaker 11.

In this way, regardless of the number of resin bodies 1, when the gas sensor 2 performs a detection operation, the main breaker 11 performs a breaking operation. Therefore, even if a plurality of resin bodies 1 are attached, abnormal overheating can be monitored with one gas sensor 2, and the electric circuit L is cut off in response to the occurrence of abnormal heat generation, thereby preventing continuation of abnormal overheating.
In addition, since the gas sensor 2 is placed inside the housing of the distribution board, it is in the same closed space as the resin body 1, and even if the amount of gas generated is small, the gas sensor 2 can be detected well, and an abnormality can be reliably detected. Can detect fever.
Furthermore, since the alarm section 5 issues an alarm when the gas sensor 2 performs a detection operation regardless of the number of resin bodies 1, the occurrence of abnormal heat generation can be recognized.
In addition, since the resin body 1 is made of a resin with a lower heat resistance temperature than the housing of the electrical device 10, abnormal heat generation can be detected by gas generation before the housing is deformed due to heat generation.

FIG. 3 shows a configuration in which the abnormal heat generation detection system is applied to an outlet, in which (a) is a front view of the outlet, and (b) is an explanatory diagram of the internal structure. The outlet 17 is configured to be installed by being attached to a switch box (not shown) buried in the wall surface, and here has two sets of plug blade insertion openings 18 and is an outlet to which two plugs (not shown) can be connected. It shows.
Then, as shown in FIG. 3(b), the resin body 1 is attached to the blade receiving springs 19 arranged in each blade insertion opening 18, and the gas sensor 2 is arranged at an intermediate position between these blade receiving springs 19. ing. Further, although not shown, the signal output section 3, the electric circuit interrupting section 4, and the alarm section 5 shown in FIG. 1 are housed in an outlet box.
With this configuration, when the blade receiving spring 19 generates abnormal heat, the resin body 1 generates gas, and the gas sensor 2 detects it. As a result, the circuit interrupter 4 performs a interrupting operation to stop supplying power to the outlet 17, and the alarm section 5 issues an alarm sound.

In this way, if abnormal heat generation occurs in the outlet 17, the electric circuit L is cut off, so that heat generation can be reliably eliminated. Furthermore, since the gas sensor 2 is placed between the blade receiving springs 19 of the outlet 17, that is, placed inside the housing of the outlet 17, the gas sensor 2 can detect even a small amount of gas generated, thereby reliably detecting abnormal heat generation. can.
Note that the gas sensor 2 does not need to be placed inside the housing of the outlet 17, but can detect the gas generated by the resin body 1 with the same sensitivity as long as it is placed inside a switch box forming a closed space.
Moreover, since an alarm sound is emitted when abnormal heat generation occurs in the outlet 17, the occurrence of abnormal heat generation can be recognized.

In addition, in the said embodiment, although the electric circuit interruption part 4 and the alarm part 5 which interrupt|block the electric path L are provided, either one may be sufficient.
In addition, the resin body 1 used has a heat resistance temperature lower than that of the resin forming the housing, but the same resin as the housing may be used, and even if it is the same resin, Since the resin body 1 closest to the monitored part M deteriorates and generates gas before the housing, abnormal heat generation can be detected before the housing deforms and deteriorates due to the heat generated by the monitored part.

1...Resin body, 2...Gas sensor, 3...Signal output section, 4...Electric circuit interrupting section, 4b...Interrupting section, 5...Alarm section, 10...Electrical equipment, 11...Main breaker (circuit) circuit breaker), 11a...external control terminal (signal input part), 12...branch breaker (circuit breaker), 12b...load side terminal (electrical circuit connection part), 17...outlet, 18...plug blade insertion Mouth, 19...Blade receiving spring, A...Closed space (specific closed space), M...Monitored part.

Claims (5)

A resin body having a heat resistance temperature that is the same as or lower than the heat resistance temperature of the resin housing of the electrical equipment is disposed in close contact with or in close proximity to the monitoring target part of the electrical equipment, and
a gas sensor that is placed in a specific closed space common to the resin body and detects gas emitted from the resin body when it is overheated by heat generation of the monitoring target part;
An abnormal heat generation detection system comprising: a signal output section that outputs a predetermined signal when the gas sensor performs a detection operation. The monitored part is an electrical circuit connection part of at least one circuit breaker assembled in a distribution board,
The resin body is disposed at the electrical circuit connection part of the circuit breaker, and the one gas sensor and the signal output part are installed in the housing of the distribution board,
Furthermore, the master breaker, which is one of the circuit breakers assembled in the distribution board, has a signal input section that operates to interrupt in response to the predetermined signal,
2. The abnormal heat generation detection system according to claim 1, wherein the main breaker operates to shut off when the gas sensor performs a detection operation. The monitored part is an electrical circuit connection part of at least one circuit breaker assembled in a distribution board,
The resin body is disposed at the electrical circuit connection part of the circuit breaker, and the one gas sensor and the signal output part are installed in the housing of the distribution board,
The abnormal heat generation detection system according to claim 1, further comprising an alarm unit that issues an alarm based on the predetermined signal. The monitored part is a blade receiving spring of an outlet to which a plug is connected,
The resin body is arranged on the blade receiving spring, and
The gas sensor and the signal output unit are housed in a housing of the outlet or a switch box in which the outlet is housed,
Further, a power circuit interrupter is provided on a power supply side electrical circuit that conducts electricity to the outlet, and the circuit interrupter operates to interrupt the electrical circuit in response to the predetermined signal.
2. The abnormal heat generation detection system according to claim 1, wherein when the gas sensor performs a detection operation, the electric circuit interrupting section performs an interrupting operation. The monitored part is a blade receiving spring of an outlet to which a plug is connected,
The resin body is arranged on the blade receiving spring, and
The gas sensor and the signal output unit are housed in a housing of the outlet or a switch box in which the outlet is housed,
The abnormal heat generation detection system according to claim 1 or 2, further comprising an alarm unit that issues an alarm based on the predetermined signal.

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