JP5342405B2 - Wiring equipment - Google Patents

Description

  The present invention relates to a wiring apparatus such as a power outlet or a plug having a function of detecting a sign of tracking.

  2. Description of the Related Art Conventionally, there has been known a wiring device that detects discharge gas generated in a plug connection portion as a sign of tracking and operates an alarm device or a circuit breaker. For example, the conventional power outlet 51 shown in FIG. 10 includes a plug insertion port 53 and a detection hole 54 in the front cover portion 52a of the case 52, and a discharge gas G accompanying spark discharge generated in a plug blade (not shown). Is detected from the detection hole 54 to the inside of the case 52, detected by a linear sensor 56 embedded in the inner wall 55, and a detection signal is sent to a tracking detection circuit on the circuit board 57.

  Patent Document 1 describes a power outlet in which a large-diameter through hole is formed on the front surface of a case, a bushing is press-fitted into the through-hole, and a small-diameter detection hole is formed in the center of the bushing. In Patent Document 2, a detection hole is formed in the case between two plug blades, a sensor for detecting discharge gas, an alarm lamp, and an alarm buzzer are incorporated in the case, and a tracking detection function is added to the plug. Technology to do is described.

Japanese Patent Laid-Open No. 2006-48962 JP 2007-5027 A

  However, according to the conventional wiring device, since the detection hole 54 is always open on the outer surface of the case 52, foreign matter easily enters the inside of the case 52. In Patent Document 1, the through hole is closed with a bushing. However, in order to secure the gas passage, it is necessary to finely process the detection hole in the bushing which is a separate part, and it takes time and effort to install the bushing. There was a problem that the production cost of the was expensive.

  Further, in the conventional tracking detection mechanism, since the sensor 56 is spatially separated from the detection hole 54, it is difficult for the discharge current to flow. In addition, since the sensor 56 and the detection hole 54 are opposed to each other in a very small area, the sensitivity of the sensor 56 decreases when the relative position of the detection hole 54 and the sensor 56 changes due to deformation of the case 52 or the inner wall 55. There was also a problem of fear.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wiring device that can prevent foreign matter from entering the inside of a case and can detect tracking with high accuracy by a simple and inexpensive mechanism.

  In order to solve the above problems, the wiring device of the present invention is provided with a sensor that forms a detection hole in the case, guides the discharge gas to the inside of the case through the detection hole, and detects the discharge gas on the inner wall of the case, A locking hole is formed in the sensor, a pin penetrating the locking hole is provided on the inner wall, the sensor is locked to the base of the pin, the tip of the pin is inserted into the detection hole, and between the detection hole and the pin A slit is formed to guide the discharge gas to the sensor.

  Here, it is preferable that the sensor is formed in a strip shape with a metal plate so that the sensor can come into contact with the discharge gas over a wide area, and a positioning groove into which the sensor is fitted is provided on the inner wall. Further, in order to adhere the moisture in the discharge gas to a narrow space with a limited space over a wide area, it is desirable to form a plurality of irregularities on the relative surface of the pin and the detection hole so as to extend in the flow direction of the discharge gas. .

  According to the wiring device of the present invention, since the pin protruding from the inner wall blocks the detection hole, it is possible to prevent foreign matter from entering the inside of the case without using a separate part. Further, since the moisture contained in the discharge gas adheres to a wide area of the slit surface, the discharge current easily flows to the sensor side. In addition, since the pin fixes the relative position between the sensor and the detection hole and the slit is directly connected to the sensor, the sensitivity of the sensor can be increased and a sign of tracking can be detected with high accuracy.

It is a perspective view of the power outlet which shows Example 1 of this invention. It is a front view which shows the plug insertion port and detection hole of a power outlet. FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 showing a tracking detection mechanism around a detection hole. It is a perspective view which shows the sensor attachment structure of a tracking detection mechanism. It is the B section enlarged view of FIG. 3 which shows the slit between a pin and a detection hole. It is the C section enlarged view of FIG. 2 which shows the uneven | corrugated strip formed in the outer peripheral side of a pin. It is the C section enlarged view of FIG. 2 which shows the uneven | corrugated strip formed in the inner peripheral side of a detection hole. It is sectional drawing of the insertion plug which shows Example 2 of this invention. It is the D section enlarged view of FIG. 8 which shows the tracking detection mechanism of an insertion plug. It is a principal part fracture | rupture top view which shows the conventional power outlet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the wiring device of this embodiment, as shown in FIG. 5, the detection hole 8 is formed in the front cover portion 2 a of the case 2, and the discharge gas G flows from the outside to the inside of the case 2 through the detection hole 8. A positioning groove 13 is formed in the inner wall 10 of the case 2, and a sensor 11 made of a metal strip is fitted in the positioning groove 13. A locking hole 12 is formed in the sensor 11, and a pin 14 that projects through the locking hole 12 is provided on the inner wall 10. The base of the pin 14 locks the sensor 11, the tip of the pin 14 is fitted into the detection hole 8, and a slit 15 that guides the discharge gas G to the sensor 11 is formed between the detection hole 8 and the pin 14. Yes.

  Next, a first embodiment in which the present invention is embodied in a power outlet will be described with reference to FIGS. As shown in FIG. 1, in the power outlet 1, two sets of plug insertion ports 3 are arranged on the front cover portion 2 a of the case 2, for example, up and down. Next to the plug insertion port 3, an alarm lamp 4 and a circuit breaker 5 that operate when a sign of tracking is detected, a buzzer stop button 6 that stops the operated buzzer, and an operation test of the tracking detection circuit are performed. A test button 7 is provided.

  As shown in FIGS. 2 and 3, a detection hole 8 that guides the discharge gas to the inside of the case 2 is formed between the two plug insertion ports 3. A receiving blade 9 that receives the plug blade body 23 (see FIG. 8) is fixed to the back of the plug insertion port 3, and the front cover portion is positioned between the pair of receiving blades 9 so that the inner wall 10 faces the detection hole 8. It is erected so as to contact the inner surface of 2a. Then, a sensor 11 is mounted on the upper end surface of the inner wall 10, detects the discharge gas flowing in from the detection hole 8, and transmits a detection signal (current) to the tracking detection circuit on the circuit board (see FIG. 10).

  As shown in FIGS. 4 and 5, the sensor 11 is formed of a metal band plate, and a locking hole 12 having substantially the same size as the detection hole 8 is formed in a part of the band plate. A positioning groove 13 into which the sensor 11 is fitted is provided on the upper end surface of the inner wall 10, and a pin 14 that penetrates the locking hole 12 is integrally projected. The pin 14 is formed in a cylindrical shape having a slightly smaller diameter than the locking hole 12 and the detection hole 8, the base portion of the pin 14 locks the sensor 11, and the tip portion of the pin 14 is fitted in the detection hole 8. An annular slit 15 is formed between the detection hole 8 and the pin 14, and the discharge gas G is guided to the sensor 11 through the slit 15.

  As shown in FIGS. 6 and 7, on the relative surface of the detection hole 8 and the pin 14, a plurality of ridges 16 and 17 extend through the slit 15 in the flow direction of the discharge gas G (the arrow direction in FIG. 5). Is formed. 6 are formed on the outer peripheral surface of the pin 14 at an equal pitch. 7 are formed on the inner peripheral surface of the detection hole 8 at an equal pitch.

According to the power outlet 1 configured as described above, the following operational effects can be obtained.
(A) The detection hole 8 of the front cover portion 2a is closed with the pins 14 projecting from the inner wall 10, and foreign matter can be reliably prevented from entering the inside of the case 2 without using another part such as a bushing.
(B) It is possible to eliminate the opening from between the plug insertion ports 3 to give the user a sense of security and to improve the appearance of the power outlet 1.

(C) Moisture contained in the discharge gas G is adhered to the relative surfaces of the detection hole 8 and the pin 14, and an annular current path using moisture as a medium can be formed in the slit 15.
(D) Since the plurality of ridges 16 and 17 are formed on the relative surfaces of the detection hole 8 and the pin 14, the moisture adhesion area can be expanded and the current path of the slit 15 can be formed in a wider range.

(E) Since the pin 14 fixes the relative position between the sensor 11 and the detection hole 8 and directly connects the current path of the slit 15 to the sensor 11, the sensitivity of the sensor 11 with respect to the discharge current is increased, and a sign of tracking is provided. It can be detected with high accuracy.
(F) Since the sensor 11 is formed in a band shape and is fitted in the positioning groove 13 of the inner wall 10, the contact area with the discharge gas G can be expanded, and the sensitivity of the sensor 11 can be further increased.

  Next, a second embodiment in which the present invention is embodied as an insertion plug will be described with reference to FIGS. In the plug 21, two plug blades 23 protrude from the front cover portion 22 a of the case 22. A detection hole 24 is formed between the plug blades 23, and the discharge gas G flows from the outside of the case 22 to the inside through the detection hole 24. A positioning groove 28 is formed in the inner wall 25 of the case 22, and a belt-like sensor 26 similar to that of the first embodiment is fitted in the positioning groove 28.

  A locking hole 27 is formed in the sensor 26, and a pin 29 penetrating the locking hole 27 is integrally provided on the inner wall 25. The base of the pin 29 locks the sensor 26, and the tip of the pin 29 is fitted in the detection hole 24. A slit 30 that guides the discharge gas G to the sensor 26 side is formed between the detection hole 24 and the pin 29, and irregular stripes 16 and 17 (see FIGS. 6 and 7) are formed in the slit 30 as necessary. Is provided. Therefore, as with the power outlet 1 of the first embodiment, the plug 21 can prevent foreign matter from entering the case 22 and can detect a sign of tracking with a simple and inexpensive mechanism with high accuracy. Can do.

  In addition, this invention is not limited to the said Example 1, 2, For example, change the shape of a detection hole or a pin into an ellipse or a polygon, or it applies to the wiring apparatus equipped with both a plug and an outlet socket. For example, the configuration of each part can be changed as appropriate without departing from the spirit of the invention.

1 Power outlet 21 Plug 2, 22 Case 8, 24 Detection hole 10, 25 Inner wall 11, 26 Sensor 12, 27 Locking hole 13, 28 Positioning groove 14, 29 Pin 15, 30 Slot 16, 17 Concavity and convexity G Discharge gas

Claims (3)

In the wiring device provided with a sensor for detecting the discharge gas on the inner wall of the case, forming a detection hole in the case, guiding the discharge gas through the detection hole to the inside of the case,
A locking hole is formed in the sensor, a pin penetrating the locking hole is provided on the inner wall, the sensor is locked to the base of the pin, and the tip of the pin is fitted into the detection hole. A wiring device in which a slit for guiding the discharge gas to a sensor is formed between pins.   The wiring device according to claim 1, wherein the sensor is formed of a metal band plate, and a positioning groove into which the sensor is fitted is provided on the inner wall.   The wiring device according to claim 1 or 2, wherein a plurality of concave and convex strips are formed on a relative surface of the pin and the detection hole so as to extend in a discharge gas flow direction.

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