JP3295585B2 - Liquid leak detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a liquid leakage detecting device for detecting at an early stage whether or not liquid leakage has occurred in a liquid leakage detection target area.

[0002]

2. Description of the Related Art In factory facilities and other facilities, leaks may cause disasters or damage the facilities themselves. Therefore, it is necessary to recognize the occurrence of leaks at an early stage.
For this reason, various optical means have been proposed as simple and reliable means. For example, a device configured to irradiate light to a filter made of thin paper or the like and detect leakage of liquid by detecting a change in the amount of transmitted light or reflected light of the filter when the liquid leaks into the thin paper. (Patent Application No. 35353 of 1987). However, when targeting high viscosity liquids, it is difficult to penetrate thin paper, it is not useful, and when resetting, there is a disadvantage that replacement of thin paper is required and it is troublesome and expensive. When a liquid that is not suitable for a clean room that dislikes stiffness and that has a high risk is the target, the user may encounter an unexpected disaster when the thin paper is replaced without paying much attention to the operator. Therefore, a reflective medium that is a transparent (semi-transparent) material having a light refractive index close to the light refractive index of the leaked liquid and has a reflective surface that reflects irradiation light when water is not immersed, and a light emitting unit that irradiates the reflective medium There has been proposed a liquid leakage detecting device comprising liquid detecting means for detecting liquid leakage based on information from the light emitting means, and capable of detecting liquid leakage by a change in the amount of reflected light when the reflecting surface is flooded. (Japanese Utility Model Registration Application No. 97626), for example, the distance (placement) between the liquid detection device and a floor or the like on which the liquid detection device is mounted (hereinafter abbreviated as “mounting surface”). This occurs when the liquid leakage detection device is not installed parallel to the surface and the liquid leakage detection device is placed at an angle.) It may cause malfunction of the liquid detection device, and the leakage may cause If hardly penetrate between the sensing device has a problem such as can not be detected (viscosity of leakage is high when) leakage.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a leak detecting device which can eliminate the cause of the malfunction and can detect the leak immediately regardless of the nature of the leak. is there.

[0004]

In order to attain the above object, first, even if the nature of the liquid leakage is high, it can be detected by reaching the periphery of the casing of the liquid leakage detection device. If it is configured and does not necessarily need to reach the bottom of the casing, it is possible to detect the leakage at an early stage without making the nature of the leakage a problem. Further, in order to avoid malfunction, the object can be achieved by providing a means for confirming whether or not the liquid leakage detection device is properly installed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
1 is a perspective explanatory view showing an outline of the embodiment, FIG. 2 is an explanatory view showing a change in reflected light at the time of liquid leakage, FIG. 3 is an explanatory view showing no influence of external light, and FIG. FIG. 5 is an explanatory diagram showing the confirmation means, and FIG. 5 is a block circuit diagram. As shown in FIG. 1, the casing (1) is configured to be a part of a liquid leakage detection device mechanism. That is, the casing (1) is formed in a cylindrical body having a transparent or translucent bottom having a circular or regular polygonal cross-sectional shape, provided with a plurality of reflecting portions (4) described later, and ) And a light source circuit (2) for irradiating a reflecting object (8) , which will be described later, a light receiving circuit (3) for receiving light reflected from the reflecting section (4), and a light receiving circuit (3) for receiving light. A detection signal generation circuit / current limiting circuit (10) for detecting a change in light amount and outputting a detection result as a signal is housed. The reflecting portion (4) is provided at a plurality of locations below the cylindrical body.
From the side wall of the cylinder to the center of the bottom wall
Is formed in a prism shape, and the prism shape portion is formed.
Except for the bottom outer surface (7), the inner surface (5) and the prism-shaped portion
And the outer surface (6) is formed as a smooth surface. Then, a reflector (8) having a smooth surface is fitted between the mounted object of the casing (1) and the reflector (4) . In this case, the light (L) irradiated in the vertical direction on the inner surface (5) is not transmitted but received as reflected light (L *).
As shown in FIG. 2, when the liquid leaks to the outer surface of the casing (1), the leaked light is transmitted at that portion, and the amount of light received by the light receiving circuit (3) decreases. As shown in FIG. 3, external light (Lx)
Does not reach the light receiving circuit (3) and does not affect the leak detection function. Also, as shown in FIG.
Is not placed parallel to the object, the reflected light (L *)
Is not received by the light receiving circuit (3) , so that it can be seen that it is not mounted immediately in parallel. As described above, when the liquid is not properly placed, even if the liquid leaks, the liquid may not reach the detection area, and early and accurate detection becomes impossible. According to the present invention, such a problem can be completely prevented. As the configuration of the light source circuit (2), the light receiving circuit (3), and the detection signal generating circuit / current limiting circuit (10), for example, a circuit as shown in the block diagram of FIG. 5 is conceivable. Absent.

[0006]

Industrial Applicability The present invention relates to an apparatus capable of detecting a liquid leak at a factory facility or other various facilities which is likely to cause a disaster or damage the facility itself early and reliably. Is so concise that
Since it can be manufactured and supplied at a low cost, it is possible to prevent disasters and damages beforehand, and since the handling of the device is easy, it can be installed and used without special knowledge and experience.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing an outline of an embodiment.

FIG. 2 is an explanatory diagram of a change in reflected light at the time of liquid leakage.

FIG. 3 is an explanatory diagram showing no external light influence;

FIG. 4 is an explanatory view showing a means for confirming whether or not the mounting state is correct;

FIG. 5 is a block circuit diagram.

[Explanation of symbols]

1 casing 2 source circuit 3 receiving circuit 4 reflecting portion 5 the inner surface 6 an outer surface 7 bottom outer surface 8 reflecting object 10 detection signal generating circuit, current limiting circuit

Claims (1)

(57) [Claims] 1. A sectional shape of a circle or regular polygon having a bottom.
At the bottom of the transparent or translucent cylindrical body, from the side wall to the bottom
A portion of the wall edge slightly near the center is formed in a prism shape, and except for the bottom outer surface (7) of the prism shape portion, the prism is formed.
The inner surface (5) and the outer surface (6) of the
And a casing (1) provided with a reflecting portion (4), and inserted between the mounted object of the casing (1) and the bottom outer surface (7).
Reflective material formed on the smooth surface (8), wherein the reflective portion (4) and reflector and light source circuit for irradiating the (8) (2), the reflective portion (4) and reflector (8 ), And a detection signal generating circuit / current limiting circuit (10) for detecting a change in the amount of light received by the light receiving circuit (3) and outputting a detection result as a signal. ) And a liquid leakage detection device