JPS62136735A - Overcurrent detection - 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] <Industrial Application Field> The present invention is designed to prevent abnormal currents (overcurrent ) This relates to the detection of abnormal currents (overcurrents) that emit odorous substances and issue alarms.

Therefore, the present invention is applicable to various industries and to all types of equipment, from industrial equipment to general household equipment.

<Prior art> Conventionally, to detect abnormal current, a sensor (circuit, element, etc.) that generates a voltage output in response to an increase in current is generally known. There are methods of converting and amplifying the voltage, and methods of simply inserting a resistor in series and obtaining the voltage by the voltage drop, but all methods use electrical amplification means to drive the alarm. I had to increase the power to just enough power.

In addition, the structure becomes even more complicated if circuits, amplifiers, and alarms for detecting abnormal currents are installed for each electronic component where abnormal currents are expected to occur inside complex electrical or electronic products. However, it also has the drawbacks of being large and very expensive. Furthermore, if an alternating current is used in one circuit, the method becomes more complicated than the conventional method, making it difficult to use in practice.

Purpose> An object of the present invention is to provide an overcurrent detection method that does not use a detection circuit, an amplifier, an alarm, etc. as described above, has a simple configuration, and is inexpensive.

<Summary of the Invention> The main features of the present invention include a heating element that generates heat due to overcurrent, and an encapsulating body that is attached to the heating element and encapsulates an odorous substance and melts and ruptures at a predetermined temperature. It lies in having.

<Example> The abnormal current (overcurrent) detection method of this example is to encapsulate an odorous substance and place an encapsulation body that melts and ruptures due to an abnormal current flowing through a heating element into an element or circuit where an abnormal current is expected to occur. Embodiments of the present invention are shown in FIGS. 1 to 6. In the detector 1 shown in FIG. 1, H is a coil-shaped heater connected to the lead wire 2. 0M is a microcapsule in which an odorous substance is encapsulated, and is attached to a coil-shaped heater M. B is a hole through which the odorous substance is released, and J is the emitted odorous substance.

FIG. 3 shows an example in which the heater is installed in a glass tube fuse, and H2 is a coil-shaped heater to which a microcapsule containing an odorous substance is added.

f is connected to gold AC by a fuse connected in series with the coiled heater H2.

T is a fuse holder and t is a metal fitting.

Fig. 2 shows an example of actual use, Fig. 2 (I) shows an example of use in an electric motor such as a motor, and Fig. 2 (II) shows an example of use in an electronic circuit.

Next, the operation will be explained. First, in FIG. 2(I), the motor G is normally rotated and stopped by the control device ME. Here, if an abnormality such as runaway or locking of the motor shaft occurs, the current i flowing through the load (motor G) becomes extremely large, resulting in a so-called overcurrent.

Here, the current i flowing through the heater H also increases, causing heat generation. Due to this heat generation, the microcapsules enclosing the odorous substance melt, and the odorous substance is emitted from the inside through the hole B.

Similarly, it can be used in a circuit using a semiconductor as shown in FIG. 2 (II) even when the load R becomes abnormal and an overcurrent flows.

As described above, when an overcurrent i flows during an abnormality, the abnormality can be detected as an odor.

Figure 3 shows an embodiment of the present invention incorporated into the size of a normal glass tube fuse, in which the thread fuse f is connected in series to the heater H2.
Connected to each metal fitting CI.

Connected to C2.

T is a fuse holder for setting a glass tube fuse, and a circuit current is passed between tl and t2.

Microcapsules M containing an odorous substance are attached to the surface of the heater H2, and the microcapsules M are melted by the heat generated by the heater H2 due to the overcurrent i, and the odorous substance encapsulated therein is released.

Furthermore, if a very dangerous large current flows, the fuse can be used in combination with a fuse as shown in FIG. 3 to cut off the large current. In addition, by integrating it, it becomes compact, there is no need to attach a separate fuse, and replacement becomes easy.

The K and Q cases are ceramic and glass.

Nonflammable materials such as cement and heat-resistant plastic are recommended. The material for the microcapsules may be gelatin, starch, cellulose, silicone, paraffin, etc. The odorous substances to be placed inside may be, for example, ammonia, esters, acetic acid, etc., but the capsules do not react with odorous substances (they do not dissolve). (No) It can be combined with other materials.

The microcapsules may be produced by the already known electrostatic coalescence method, spray granulation method, or the like.

In addition, when paraffin is used in microcapsules,
The melting temperature of paraffin is around 60'C, so
It is sufficient to provide a heater that can raise the temperature to 60°C or higher when a predetermined overcurrent i is applied.

The heater may be, for example, a coiled nichrome wire heater, a ceramic heater, or a nine-sided heating element.

Figure 4 shows another embodiment, where L is ceramic.

A board such as Beta is covered with double-sided tape S on the back side, and a flame-retardant synthetic resin bag filled with an odorous gas such as ammonia gas or ester is provided on the front side.
A heater H3 is placed in contact with this bag.

When an overcurrent is passed between the terminals t2' and t2 to which this heater is connected, the bag containing the odorous gas is torn due to heat generation.

In this case, the operating overcurrent value can be set based on the melting temperature of the synthetic resin and the heat generated by the heater H3 due to the overcurrent.

FIG. 5 shows another embodiment of the present invention in which the above-mentioned configuration is combined with a temperature fuse. When abnormal current i flows in one circuit due to a failure in load R, heater H4 generates heat. The microcapsules enclosing the odorous substance are ruptured, and the substance is released from inside.

Here, heat is also transferred to the temperature fuse provided near the heater H2, and when the cutoff temperature of the temperature fuse fT is reached, the circuit can be automatically cut off.

That is, when an abnormal current i occurs, the circuit can be automatically cut off by an alarm using an odorous substance and a temperature fuse fT.

This allows one circuit to be automatically protected even when the device is in unattended operation, and when maintenance is performed later, abnormalities can be quickly discovered from the residual odor.

h is a container made of ceramic or the like with holes for odor release.

The example shown in FIG. 6 is different from the example described above.

1 Normal interrupting means (e.g. fuse) due to abnormal current i
This example is used to notify that a fuse or the like has been disconnected when a circuit is interrupted.

Here, an abnormality occurs in the main unit, and an abnormal current i flows through the fuse FU, cutting the fuse FU.

A small current i' then flows through the resistor r to the detector, heating the heater and emitting the odorous substance.

In this case, under normal conditions, the circuit current flows through the fuse FU, so the current flowing through the detector is (very small)
So it can be ignored.

In this way, it can also be used as a means to notify that the shutoff device has worked.

Effectiveness> As mentioned above, it has a very simple structure that only requires an odorous substance sealed in a heating element such as a heater, and is
If abnormal current detection, which previously required a complicated circuit, can be configured easily, simply, and at low cost, the entire device can be downsized.

Furthermore, since the present invention is operated by electric power applied to the heating element, it can be operated regardless of whether the current used for the load is direct current or alternating current.

By using a plurality of odorous substances used in the present invention and providing them to each load, it is possible to identify which part has caused the abnormality based on the odor.

For example, by adding pineapple, apple, or banana odors, even if one main unit of equipment goes down, you can simply notify the service personnel over the phone, and the service personnel will be able to estimate the location of the equipment malfunction. There is no need to carry unnecessary service parts, and there is no need to carry around unnecessary service parts, and there is no need to worry about any abnormalities occurring when performing repairs. It is possible to easily find damaged parts, which also improves the effectiveness of repair time.

Furthermore, by combining an odorous substance and a smoke-emitting substance, it is possible to issue an alarm using both the sense of smell and the sense of sight.

As described above, the present invention has great effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a detection element to which the present invention is applied placed in a cylinder, Fig. 2 (I) and (II) are detailed explanatory diagrams of the present invention connected in series with a load, and Fig. 3 1 is a detailed explanatory diagram of the present invention in the shape of a glass tube fuse, FIG. 4 is an explanatory diagram of an embodiment of the present invention in which a gaseous substance is used as an odorous substance and sealed in a bag, and FIG. FIG. 6 is an explanatory diagram of the circuit according to the embodiment of the present invention combined with a temperature fuse and a perspective view, and FIG. ■ is the detector, B is the hole, M, m, M2 are the capsules, and H is the heater. Male 1 Kasumi Sara 22 (I) ξ

Claims (2)

[Claims] (1) Overcurrent detection characterized by having the following: a heating element that generates heat due to overcurrent; and an envelope that is attached to the heating element, encloses an odorous substance, and melts and ruptures at a predetermined temperature. Method. (2) The overcurrent detection method according to claim 1, wherein the encapsulating body is a microcapsule containing an odorous substance.