JP2578606Y2 - LED display unit for explosion-proof electrical equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display unit used as a charge monitor or the like in explosion-proof electric equipment such as explosion-proof guide lights.

[0002]

2. Description of the Related Art An induction lamp is provided with a rechargeable storage battery for turning on a lamp independently even after a normal power supply is cut off. This battery must be fully charged at all times, and is equipped with a charge monitor to confirm this. If the guide light is an explosion-proof type, the charge monitor and the mounting portion of the charge monitor must also have an explosion-proof structure.

In a charge monitor of an explosion-proof type guide light, a display unit using an LED display element is usually provided in a container of the guide light, and light emitted from the LED display element of the display unit is transmitted through a window fitted with glass or the like. It is structured to be led out of the container. Japanese Utility Model Application Laid-Open No. 64-25847 discloses a charge monitor in which light emitted from an LED display element in a container is led out of the container using an optical fiber.

[0004]

In such a charge monitor, different structures are adopted between a pressure-resistant explosion-proof type and a safety-enhanced explosion-proof type. The arrangement, the window structure, and the structural design of the optical fiber portion are performed, and there has been a problem that these designs are troublesome.

[0005] The present invention has been made in view of the above circumstances, and can be shared by a flameproof type and a safety-enhanced explosion-proof type by mounting the LED display unit as a unit structure certified as an explosion-proof electric part, and mounting. It is an object of the present invention to provide an LED display unit for an explosion-proof electric device whose structure can be standardized.

[0006]

An LED display unit for an explosion-proof electric device according to the present invention includes an LED display element molded into a lens shape and a recess corresponding to the resin molded portion of the LED display element at the bottom inside. A transparent container that accommodates the LED display element by fitting a resin mold part into the recess, and one end is electrically connected to the lead of the LED display element and the other end is outside the transparent container. It is characterized by comprising a lead wire led out and a mold resin filled in the transparent container so as to enclose the LED display element including the connection portion of the lead wire in the transparent container.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a charge monitor of an explosion-proof type guide light according to an embodiment of the present invention.

The explosion-proof type guide light has a container 10 for accommodating a storage battery, a charging device and the like. An LED display unit 20 is attached to the container 10 as a charge monitor unit. A mounting hole 11 is provided in the unit mounting portion of the container 10 so as to penetrate the inside and outside of the container 10. Mounting hole 1
The inner end of 1 is a small-diameter holding portion 11a reduced in diameter to hold the LED display unit 20, and the outer end is a fixing portion for fixing the LED display unit 20 in the mounting hole 11. Large diameter screw portion 11b into which the tool 30 is screwed
It has become.

[0009] The LED display unit 20 includes an LED display element 21 and a transparent container 22 accommodating the same. The LED display element 21 has a structure in which the element body is resin-molded into a lens shape, and two leads 21b, 21b are projected from the resin molded portion 21a. LE
Lead wires 23, 23 are connected to the leads 21b, 21b of the D display element 21.

The transparent container 22 is made of, for example, polycarbonate resin and has a cylindrical shape with one end closed. An LED display element 21 is provided on the inner surface of the bottom of the transparent container 22.
A hemispherical recess 22a in which the resin mold portion 21a is fitted closely is provided concentrically.

Then, the resin molded portion 21a of the LED display element 21 is fitted into the recess 22a, and the lead wire 2
By filling the transparent container 22 with the mold resin 24 in a state in which the transparent containers 3 and 23 are drawn out of the transparent container 22,
The LED display element 21 is sealed in the transparent container 22 together with the connection portions with the lead wires 23, 23.

The LED display unit 20 is mounted on the container 10 as follows. With the bottom of the transparent container 22 facing outward and the lead wires 23, 23 introduced into the container 10, the LED display unit 20 is attached to the mounting hole 11 of the container 10.
Plugged in. And the screw portion 11 of the mounting hole 11
The LED display unit 20 is held in the mounting hole 11 by screwing the base end of the fixture 30 into the b through an O-ring 40 for sealing.

The fixture 30 has a through hole 31 through which light passes in the center.
Having. The end of the through-hole 31 on the emission side expands in a trumpet shape.

Light emitted from the LED display element 21 of the LED display unit 20 is transmitted from the bottom surface of the transparent container 22 to the LE.
Go out of the D display unit 20. The light is transmitted to the fixture 30
Out of the container 10 through the through hole 31.

Since the LED display unit 20 is certified as an explosion-proof electric component by itself, when it is mounted on the container 10, a gap formed between the inner peripheral surface of the mounting hole 11 and the outer peripheral surface of the transparent container 22. And the explosion strength can be satisfied, and the mounting structure can be simplified.

In particular, in the mounting structure of the present embodiment, since the fixing device 30 is screwed into the mounting hole 11 from outside the container 10 to hold down the LED display unit 20, it is easy to secure the strength.

Although the above embodiment is used as a charge monitor in an explosion-proof type guide light, the present invention is not limited to this, and other types of explosion-proof electric equipment, safety-enhanced explosion-proof electric equipment, etc. can be charged. It can be used for monitors, power monitors, operation monitors, etc. When used in a safety-enhanced explosion-proof electric device, the LED display unit 20 constitutes an explosion-proof electric component by itself, so that it can be used in substantially the same manner as a normal LED indicator light.

The structure of the LED display unit 20 is not limited to the above embodiment. For example, the transparent container 22 may be a cylinder such as an ellipse, a triangle with rounded corners, or a square.
The material of the transparent container 22 can be arbitrarily selected from resin, glass, and the like.

[0019]

As described above, the LED display unit for explosion-proof electric equipment according to the present invention has a unit structure that is certified as an explosion-proof electric component by itself.
Can be used for both explosion-proof type and safety-enhanced explosion-proof type. In addition, in the case of the explosion-proof type, it is only necessary to satisfy the rules for the plow and the rules for the explosion strength. Therefore, the mounting structure can be simplified and standardized. The safety-enhanced explosion-proof type can be handled almost the same as a normal LED display unit. Therefore, the design and manufacture of the charge monitor and the like in the explosion-proof electrical equipment are facilitated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a charge monitor of an explosion-proof type guide light according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Explosion-proof type guide light container 11 Mounting hole 20 LED display unit 21 LED display element 22 Transparent container 23 Lead wire 24 Mold resin 30 Fixture

Claims (1)

(57) [Scope of request for utility model registration] 1. An LED display element having a lens-shaped resin mold and a recess corresponding to a resin mold portion of the LED display element on the inner side of a bottom portion, wherein the resin mold portion is fitted into the recess. A transparent container accommodating
A lead wire having one end electrically connected to the lead of the ED display element and the other end led out of the transparent container, and the LED display element including the connection portion of the lead wire is sealed in the transparent container. An LED display unit for an explosion-proof electrical device, comprising: a mold resin filled in a transparent container as much as possible.