JP4467447B2 - Leak sensor - Google Patents

Description

  The present invention relates to an improvement in a main part of a leak sensor, particularly an optical leak sensor.

Since the leakage may cause a disaster in the factory facility and other facilities, or the facility itself may be damaged, it is necessary to detect the occurrence of the leakage at an early stage.
For this reason, conventionally, various optical liquid leakage sensors that detect the occurrence of liquid leakage have been proposed (for example, Patent Document 1).

The optical leak sensor is configured such that the case of the leak sensor main body is made of a material having a predetermined refractive index , and air or leak is in contact with the boundary surface between the detection portion provided on the bottom surface side of the case and the outer peripheral portion thereof. Have When the detection light is incident on the boundary surface from the detection unit side at an incident angle greater than the critical angle when air is in contact with the boundary surface , the detection light is detected in a non-leakage state where the boundary surface is in contact with air. Is totally reflected at the interface. On the other hand, in the leak state where the leak is in contact with the boundary surface, the refractive index of the leak is larger than the refractive index of air, so a part of the detection light is transmitted from the boundary surface into the leak. Accordingly, the amount of reflected light reflected at the boundary surface is reduced. In the optical leak sensor, leak detection is performed based on the difference in the amount of reflected light between the leak state and the non-leak state as described above.

JP-A-8-122198

However, even in the optical liquid leakage sensor, further improvement in detection performance is desired, and conventionally, there has been no appropriate technique that can solve this.
The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a liquid leakage sensor capable of improving detection performance.

As a result of intensive studies on improvement of detection performance of the liquid leakage sensor, the present inventors have found the following points.
That is, as shown in FIG. 7A, in the general leak sensor 10, one detection point 18 is provided at the approximate center of the bottom surface of the case 16 of the leak sensor main body 14. If there is no liquid leakage 50 at the detection point 18 on the bottom surface of the case 16 of the liquid leakage sensor main body 14 as shown in FIG.
However, in actuality, the smooth movement of the liquid leakage to the substantially central portion of the bottom surface of the case 16 of the liquid leakage sensor main body 14 is not performed. As a result, it was found that even if a leak occurs, detection cannot be performed, and it may take time from the occurrence of leak to detection.
Then, the present inventors have specific results causes that prevent the improvement of such detection performance, in order to improve the detection performance, multi-point of the multi-point of the external output means test known points, and the detection unit I found out that the combination with the improvement of the composition of the is very important. As a result, it has been found that the detection performance, which has been extremely difficult in the past, can be improved, and the present invention has been completed.

That is, in order to achieve the above object, a leak sensor according to the present invention includes a main body portion placed at a leak detection place, and a boundary between a detection portion provided on the bottom surface side of the main body portion and an outer peripheral portion thereof. the detection light from the inside of the main body portion and projecting light onto a surface, the leakage sensor for detecting the presence or absence of leakage and based on the change in amount of light obtained that reflected light, the body portion, a predetermined refractive index A case made of a material having an annular shape integrally formed on the bottom surface of the case, and a cross section in the diametrical direction is an inverted isosceles triangle, and the two inclined surfaces shown as isosceles in the cross section are boundary surfaces And a plurality of detection points arranged in a shifted position in the detection unit , and the detection light provided at each detection point is vertically projected toward one inclined surface. a light projecting unit, the angle of incidence of the vertical detection light on one of the inclined surfaces It becomes less than the critical angle when the air is in contact, and the vertical projection of the receiving and the other inclined surface inclined surface of one being inclined at an angle to the horizontal reflection light traveling toward the tilt one of the The incident angle of the horizontal reflected light received from the surface is equal to or greater than the critical angle when air is in contact with the other inclined surface, and the angle is set to the second vertical reflected light by receiving the horizontal reflected light. The other inclined surface that is inclined , the light receiving unit that receives the reflected light for the second time , and the external output means by light or sound for informing the leaking liquid that is arranged in one-to-one correspondence to the plurality of detection points, Consists of .

And when a leak occurs and the leak is in contact with any one of the inclined surfaces of any of the detection points, the detection light from the light projecting part or a part of the reflected light is inclined to either The amount of reflected light received by the light receiving unit compared to the case where air is in contact with one of the inclined surfaces and the detection light or horizontal reflected light is totally reflected. When the leakage is detected, the presence or absence of leakage is detected, and when leakage is detected, the external output means notifies the leakage by light or sound .

<Installation state detection>
In the present invention, it is further preferable to detect the installation state of the main body with respect to the leakage detection location based on a change in the amount of reflected light from the plurality of detection points.
The basic configuration of the optical liquid leakage sensor of the present invention, the principle of liquid leakage detection, and the principle of detection of the installation state of the main body are described in, for example, Japanese Patent Application Laid-Open Nos. 2002-82011 and 2002-181695. A thing can be used suitably.

<External output means>
In the present invention, it is preferable to provide an external output means.
Here, the external output means is an operating state of a leak sensor selected from the group consisting of a leak non-detection state, a leak detection state, a normal installation state of the main body with respect to the leak detection location, and an abnormal installation state To inform you.

In the present invention, it is preferable that the external output means includes a plurality of light emitting units or sound generating units.
Here, the light emitting unit notifies the operating state of the leak sensor by light.
Further, the sound generation unit informs the operating state of the leak sensor by sound.

In the present invention, it is also preferable that the external output means can distinguish between the liquid leakage detection state and the liquid leakage non-detection state based on light of the light emitting unit or sound of the sound generation unit.
In the present invention, the plurality of detection points are associated with the plurality of light emitting units on a one-to-one basis. It is preferable that the external output means firstly emits only the light emitting portion corresponding to the detection point of the liquid leakage detection so that the leakage occurrence direction with respect to the main body portion in the liquid leakage detection state can be confirmed.

In the present invention, it is also preferable that the external output means can distinguish between the liquid leakage detection state and the abnormal installation state based on light of the light emitting unit or sound of the sound generation unit.
In the present invention, a plurality of the main body portions are placed at the liquid leakage detection place. It is also preferable that the external output means is capable of distinguishing between the main body in the liquid leakage detection state and the main body in the liquid leakage non-detection state by light of the light emitting unit or sound of the sound generation unit.
In the present invention, a plurality of the main body portions are placed at the liquid leakage detection place. It is also preferable that the external output means be able to distinguish between the main body part in the normal installation state and the main body part in the abnormal installation state by light of the light emitting part or sound of the sound generation part.

According to the liquid leakage sensor according to the present invention, since the main body portion includes a plurality of detection points and a substantially series of liquid introduction portions, the leakage detection performance can be improved.
In the present invention, the leakage detection performance can be further improved by detecting the installation state of the main body using a plurality of detection points.
In the present invention, it is possible to further improve the leakage detection performance by providing an external output means for notifying the operation state of the leakage sensor.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a leak sensor according to an embodiment of the present invention. (A) is a longitudinal sectional view of a leak sensor main body, FIG. (B) is a block diagram of an electric control circuit incorporated in the leak sensor main body, and (C) is a leak sensor main body. It is the figure which looked at from the upper part. The leak sensor 10 shown in the figure includes a leak sensor main body (main body) 14 placed in the leak detection place 12.
The liquid leakage sensor main body 14 has an annular shape integrally formed on the bottom surface of the case 16 and a diametrical cross section having an inverted isosceles triangle shape, and two surfaces shown as isosceles in the cross section. The detection unit 18 having the inclined surfaces 19, 19 ′ as a boundary surface with the outer peripheral portion, four detection points 18 a to 18 d disposed in the detection unit 18 at different positions, and the detection in the case 16. The light projecting units 20a to 20d and the light receiving units 22a to 22d arranged above the points, and the four detection points 18a to 18d are arranged in one-to-one correspondence to notify the detected liquid leakage LED for liquid leakage display 60a-60d as output means .

Here, the case 16 projected the detection light onto the inclined surfaces of the detection points 18a to 18d at an incident angle that is equal to or greater than the critical angle when air is in contact with the inclined surfaces (boundary surfaces) of the detection points 18a to 18d. Sometimes , it is formed of a material having a refractive index that causes a difference in the amount of light in the reflected light between the leaking state and the non-leaking state. In the present embodiment, four detection points 18a to 18d are located at equal angular intervals on the same circumference in the annular detector 18 integrally formed on the bottom surface of the case 16. Is provided. Light projecting unit 20a~20d and the light receiving unit 22a~22d is positioned right above the Oite each detection point 18a~18d the inner case 16 are each leakage sensor main body within 14.
Then, as shown in FIG. 1, the light projecting unit 20a~20d is toward the inclined surface 19 which is one of the boundary surfaces definitive each detection point 18a~18d of the detection unit 18, the detection light 26a~26d downward Flood light vertically . One inclined surface 19 has an incident angle of vertical light projection that is equal to or greater than a critical angle when air is in contact with one inclined surface 19, and reflected light in a horizontal direction upon receiving vertical light projection. Therefore, the vertical detection lights 26a to 26d are received and reflected toward the other inclined surface 19 'horizontally .
The inclined surface 19 ′, which is the other boundary surface, receives the horizontal reflected light from the one inclined surface 19 and makes it the second vertical reflected light upward . At this time, the horizontal reflected light is totally reflected when air is in contact with the other inclined surface 19 ′, but when the liquid is in contact with the other inclined surface 19 ′, the horizontal reflected light is reflected. A part of the light is transmitted from the inclined surface 19 ′ into the liquid leakage, so that the amount of the second reflected light from the inclined surface 19 ′ decreases . The light receiving portions 22a to 22d at the respective detection points receive the second reflected lights 28a to 28d that are vertically reflected upward from the other inclined surface 19 ′ .
As described above, in this embodiment, leakage and have groups Dzu secondly the amount of light reflected 28 A～28d of the other inclined surface 19 'that is received by the light receiving portion 22a~22d of fourth detection point 18a~18d Detect the presence or absence of liquid.
As shown in FIG. 1, since the optical axes of the detection lights 26a to 26d coincide with the optical axes of the reflected lights 28a to 28d, the amount of light received by the light receiving portions 22a to 22d is based on only the reflected light. Thus, the loss of the detection light that occurs when the optical axes of the detection light and the reflected light do not match is not included .

In the present embodiment, an electric control circuit 30 for detecting a leak is incorporated inside the leak sensor body 14. The electric control circuit 30 includes the light projecting units 20a to 20d and the light receiving units 22a to 22d. Electrical control circuit 30 further includes a determination unit 38, a memory 40, an external output unit 41. Judgment means 38, a the leakage determination information stored in the memory 40 (e.g. leakage occurs whether the threshold used when performing the determination, etc.) and the received light amount change by the respective light receiving portions 22a~22d Compare and perform leak detection.
In the present embodiment, judgment unit 38, by monitoring the change in the amount of light received for each light receiving portions 22a to 22d, it is possible to perform each leak detection each detection point 18a to 18d. In addition, since the determination unit 38 monitors the change in the amount of received light for each of the light receiving units 22a to 22d, the specific detection point of the leakage detection state can be easily confirmed, so that the specification of the leakage occurrence direction can be accurately performed. Easy to do. When the determination unit 38 determines that one or more of the four detection points 18a to 18d are detected, the external output unit 41 notifies the detection of the leak with light or sound.

In the present embodiment, the leakage sensor main body 14 is installed in parallel to the leakage detection surface 12 in a normal installation state. By providing the detection unit 18 having an annular shape and an inverted isosceles triangle shape on the bottom surface of the case 16 as described above, a gap 46 is formed between the bottom surface of the case 16 and the leakage detection surface 12. The leaked liquid reaches the inclined surface 19 at the detection points 18a, 18b, 18c, and 18d of the detection unit 18 via the gap 46 .

The liquid leakage sensor 10 according to this embodiment is configured as described above, and the operation thereof will be described below.
That is, the liquid leakage sensor 10 according to the present embodiment uses the property that the ratio of reflected light at the detection point of the liquid leakage sensor main body 14 decreases due to the presence of liquid leakage.

For example, the non-leakage state the inclined surface 19 'of the detection point 18a~18d in contact with air, a large difference in refractive index between the detection portion 18 and the air to case 16. Thus the detection light 26a~26d from the light emitting portion 20a~20d is totally reflected by the inclined surface 19 'of the test knowledge points 18a to 18d, and is received by the light receiving unit 22.
Other hand, the leakage state leakage to the inclined surface 19 'of the detection point 18a~18d are in contact, the difference in refractive index between the detection portion 18 and the leakage of to case 16 is reduced. As a result, the reflectance at the inclined surface 19 ′ of the detection points 18 a to 18 d is reduced, and part of the detection light 26 a to 26 d from the light projecting units 20 a to 20 d is transmitted from the inclined surface 19 ′ into the liquid leakage . , correspondingly, to decrease the amount of light reflected 28a~28d reflected by the inclined surface 19 of the detection point 18a to 18d 'is also reduced amount of reflected light received by the light receiving section 22a to 22d.

The determination means 38 determines that there is a liquid leakage when the difference in the light quantity between the liquid leakage state and the non-leakage state is equal to or greater than the threshold value of the liquid leakage determination information obtained in advance in the memory 40, for example. To do.
FIG. 2 shows an external view of the leak sensor main body 14 according to the present embodiment. FIG. 4A is a view of the leak sensor main body 14 viewed from the side, and FIG. 4B is a view of the leak sensor main body 14 viewed from the bottom.
Here, what is characteristic in the present embodiment is that leakage detection is performed at a plurality of detection points 18a to 18d. As a result, in the present embodiment, the leakage detection performance is greatly improved as compared with a case where one detection point is provided in the main body.

Moreover, in this embodiment, the liquid introduction part 24 is provided . The liquid introduction part 24 is a part in which liquid leakage easily comes into contact with the other inclined surface 19 ′ of the detection part 18 . Thus, by making the other inclined surface 19 ′ of the detection unit 18 have a liquid leakage property, the contact of the liquid leakage to the inclined surface 19 ′ at the detection points 18a to 18d is facilitated, and the liquid leakage detection is accelerated. Can be achieved .

As shown in FIG. 3 (A), the liquid introduction part 24 has an annular shape and has a cross section in the diametrical direction having an inverted isosceles triangle shape, and the leaking liquid formed on the other inclined surface 19 ′. Is the sex part . FIG . 3B is an enlarged view of the liquid introduction unit 24 on the left side in FIG . 3 (B) is obtained by surface-treating the other inclined surface 19 ′ of the detection unit 18 so as to make the liquid leaking . For example, coating that is easy to adjust to liquid leakage (excellent liquid leakage) ,
Alternatively, a surface treatment such as mirroring of the inclined surface 19 ′ is performed . Due to the liquid introduction part 24 subjected to such surface treatment based on the nature of the liquid leakage, the liquid leakage smoothly contacts the inclined surface 19 ′ at the detection points 18 a to 18 d, thereby further improving the leakage detection performance. .

For example, when the leak 50 generated in the leak detection place 12 as shown in FIG. 4A reaches the first detection point of the leak sensor main body 14, the leak detection is performed at the first detection point. Is called.
Here, as shown in FIG. 4B, the leaked liquid 50 that has reached the first detection point 18d is guided toward the adjacent detection points 18a and 18c along the liquid introduction part 24. The leak detection is also performed at the points 18a and 18c.

  Moreover, even if the leak 50 generated at the leak detection place 12 is not directly located at the detection point 18d, the leak 50 is guided along the liquid introduction part 24 as shown in FIG. Therefore, the leakage detection is performed at least at any one of the detection points 18a to 18d.

Thus, in this embodiment, since the liquid leakage part 24 can smoothly contact the liquid leakage 50 with the other inclined surface 19 ′ of the plurality of detection points 18a to 18d , the liquid leakage 50 can be easily and quickly made. Can be detected . Therefore , in the present embodiment, the leakage detection performance is greatly improved as compared with the case where one detection point is provided in the leakage sensor main body.

<Installation state detection>
By the way, in order to improve the detection performance of the liquid leakage sensor, it is important to perform liquid leakage detection while maintaining the installation state of the main body in a normal state.
Therefore, in the present embodiment, it is also preferable to detect the installation state of the leakage sensor main body 14 with respect to the leakage detection location 12 based on the change in the amount of reflected light 28 from the plurality of detection points 18a to 18d. It is.

For this purpose, information for determining the installation state different from the information for determining leakage (for example, a threshold value used for determining whether the installation state is normal or abnormal) is stored in advance in the memory 40.
Then, the determination unit 38 refers to the installation state determination information stored in the memory 40 to determine whether the installation state of the leakage sensor main body 14 with respect to the leakage detection location 12 is normal or abnormal.

<External output means>
In order to improve the detection performance of the leak sensor, it is easy to distinguish between leak detection and no leak detection, to easily check the leak direction, It is also important to easily distinguish from abnormal installation conditions.
In order to easily distinguish between leakage detection and non-leak detection and to easily check the leakage direction, it is also important to improve the status display. Moreover, in order to easily distinguish between the leakage detection state and the abnormal installation state, the abnormal installation state display is also important.

Therefore, in the present invention, it is preferable to provide external output means.
Here, the external output means is a leakage sensor selected from the group consisting of a leakage detection state, a leakage non-detection state, a normal installation state of the leakage sensor main body with respect to the leakage detection location, and an abnormal installation state. It shall be used to inform the operating state.

In the present invention, it is also preferable that the external output means includes a plurality of light emitting units. It is also preferable that the external output means further includes a sound generation unit.
Here, the light emitting unit notifies the operating state of the liquid leakage sensor by light.
In addition, the sound generation unit informs the operating state of the leak sensor by sound.

Therefore, in the present embodiment, as shown in FIG. 5, the external output means 41 includes a buzzer (sound generator) 64 and a controller 66.
The external output means 41 includes liquid leakage state display LEDs (light emitting units) 60 a to 60 d and an installation state display LED (light emitting unit) 62.
For example, it is preferable to arrange a plurality of liquid leakage state display LEDs 60a to 60d in the circumferential direction in the case 16 so as to correspond to the detection points 18a to 18d. It is also preferable to provide an installation state display LED 62 in the approximate center inside the case 16. It is also preferable to provide a buzzer 64 and a controller 66 inside the case 16.
The controller 66 performs operation control of the LEDs 60 a to 60 d and 62 and operation control of the buzzer 64 based on the operating state of the leak sensor 14 from the determination means 38.

In the following, the function of status display and the abnormal installation status display will be described more specifically.
<High-performance status display>
(1) Distinguishing between leak detection and no leak detection In order to improve the status display function, in the present invention, the external output means uses the light from the light emitting part or the sound from the sounding part to detect the liquid leakage. It is also preferable to be able to distinguish between the undetected state and the liquid leakage undetected state.

That is, normally, as a display function of the detection state of the liquid leakage sensor, it is conceivable that the green LED is turned on when no liquid leakage is detected, and the red LED is turned on when a liquid leakage is detected. However, with such a general status display function, it is not possible to quickly find a sensor that has detected a leak (a detection head in a leak detection state).
On the other hand, in this embodiment, in the liquid leakage detection state as shown in FIG. 6A, for example, the four liquid leakage state display LEDs 60a to 60d are set to the alarm display blinking state. Thereby, in this embodiment, compared with the display function of the detection state of a general liquid leak sensor, the sensor (detection head of a liquid leak detection state) which detected the liquid leak can be discovered quickly.
In the present embodiment, it is also preferable to output a continuous warning sound from the buzzer 64 when the liquid leakage is detected.
In the present embodiment, by combining such a plurality of light emitting units and sound generation units, it is possible to notify the user of leak detection more quickly and more reliably. As a result, the user can detect leak detection earlier and more reliably.

(2) Confirmation of leakage occurrence direction Even if the detection performance of a leakage sensor is improved, the user can easily check it and if the necessary leakage countermeasures cannot be taken, it means the improvement of detection performance. There is not much. For this reason, in the leak sensor, it is also important to promptly display the leak occurrence direction.
Therefore, in the present invention, a plurality of detection points and a plurality of light emitting units are made to correspond one-to-one. And it is suitable for an external output means to light-emit only the light emission part corresponding to the detection point which performed the leak detection first. Thereby, in this invention, the leak generation direction with respect to the main-body part of a leak detection state can be confirmed easily.

For example, as shown in FIG. 5B, if the first detection point where the liquid leakage 50 has flowed is the detection point 18d, only the liquid leakage display LED 60d corresponding to the detection point 18d is caused to emit light. Thereby, it is possible to easily confirm from which direction the liquid leakage 50 has flowed into the liquid leakage sensor main body portion 14 by the light emission of the liquid leakage display LEDs 60a to 60d.
For example, in the same figure (B), it can confirm that the leak generation direction is the left direction in the figure with respect to the leak sensor main body part 14.

(3) Discrimination between leakage detection state and abnormal installation state In order to improve the detection performance of the leakage sensor, it is also important to be able to easily distinguish between the leakage detection state and the abnormal installation state. For this reason, an abnormal installation state display is also important.
Therefore, in the present invention, it is also preferable that the external output means can distinguish between the liquid leakage detection state and the abnormal installation state by the light of the light emitting unit or the sound of the sounding unit.

That is, normally, the output of the external output means is the same as the operation display at the time of detecting leakage even when the abnormal installation state is detected due to the installation bracket or the holder being detached. At these times, for example, the red LED is lit, while the blue LED is lit when normal.
For this reason, the general status display mechanism cannot determine at a glance whether the cause of the abnormal signal output is the leakage detection.

On the other hand, in the present embodiment, when detecting an abnormal installation state as shown in FIG. 6C, the installation state display LED 62 is periodically blinked, and the liquid leakage as shown in FIG. It can be distinguished from the time of detection. It is also preferable to output an intermittent warning sound from the buzzer 64 when detecting an abnormal installation state. This further facilitates confirmation of the installation state of the detection head by the user.
<Modification>

(1) Leak Sensor Body In the present embodiment, it is preferable that one leak sensor body is placed with respect to the leak detection place, but a plurality of leak sensor bodies are placed at the leak detection place. It is particularly preferred that
At this time, the external output means is capable of distinguishing between the leakage sensor main body in the leakage detection state and the leakage sensor main body in the leakage non-detection state by the light of the plurality of light emitting portions or the sound of the sound generation portion. Is preferred.
It is also preferable that the external output means be able to distinguish between a normally installed leakage sensor main body part and an abnormally installed leakage sensor main body part by light of a plurality of light emitting parts or sounds of sound generation parts.

(2) Liquid introduction part
The liquid introduction part is not limited to the other inclined surface 19 ′ of the detection unit 18, and it is preferable that surface treatment is performed from the bottom surface of the case 16 to the inclined surface 19 ′. As a result, the leaked liquid easily reaches the inclined surface 19 ′ at the detection points 18 a to 18 d from the outer peripheral side of the bottom surface of the case 16 via the gap 46 between the bottom surface of the case 16 and the leak detection location 12. The effect to say is acquired .

It is explanatory drawing of schematic structure of the leak sensor concerning one Embodiment of this invention. It is explanatory drawing of the detection part characteristic in the liquid leak sensor shown in FIG. It is explanatory drawing of the liquid introduction part characteristic in the liquid leak sensor shown in FIG. It is explanatory drawing of an effect | action of the liquid leak sensor shown in FIG. It is explanatory drawing of the external output means characteristic in the leak sensor shown in FIG. It is explanatory drawing of the status display by the external output means shown in FIG. It is explanatory drawing of a common leak sensor.

Explanation of symbols

10 Liquid Leak Sensor 14 Liquid Leak Sensor Body (Main Body)
16 cases
18 detectors 18a, 18b, 18c, 18d detection points
19, 19 ′ One inclined surface (boundary surface with the outer peripheral portion) of the detection unit 18 and the other inclined surfaces 20a, 20b, 20c, 20d Light projecting units 22a, 22b, 22c, 22d
24 liquid transfer part
26a, 26b, 26c, 26d detection light
28a, 28b, 28c, 28d Reflected light received by the light receiving unit
30 control circuit
46 gap
50 leaks ,
60a, 60b, 60c, 60d LED for liquid leakage display
62 LED for installation status display

Claims (7)

A body portion to be placed in leak detection location, the detection light from the inside of the main body portion and projecting light to the boundary surface of the sensing unit provided on the bottom surface of the main body portion and its outer peripheral portion, is obtained in leakage sensor for detecting the presence or absence of leakage and based on the light amount change of the reflected light that,
The body portion is made of a material having a predetermined refractive index ;
The detection that uses an annular shape integrally formed on the bottom surface of the case and has an inverted triangular shape in which the diametrical cross section is isosceles, and the two inclined surfaces shown as isosceles in the cross section are the boundary surfaces. And
A plurality of detection points arranged in a shifted position in the detection unit;
Is provided above each of said sensing points, said a light projecting unit for vertically projected downward the detection light toward one of the inclined surface, the angle of incidence of the vertical sensing light one of the inclined One of the slopes which is inclined at an angle which is equal to or greater than a critical angle when air is in contact with the surface and is reflected in the horizontal direction toward the other inclined surface upon receiving the vertical light projection And the incident angle of the reflected light in the horizontal direction received from the one inclined surface is equal to or greater than a critical angle when air is in contact with the other inclined surface, and the reflected light in the horizontal direction is The other inclined surface that is inclined at an angle to receive and reflect the second vertical reflected light upward, and a light receiving unit that receives the second reflected light ,
It consists of light from the light emitting unit for notifying leaking liquid that is arranged in one-to-one correspondence with the plurality of detection points, or external output means by sound from the sound generation unit ,
When liquid leakage is in contact with any one of the inclined surfaces of any of the detection points, a part of the detection light or the horizontal reflected light enters the liquid leakage from either of the inclined surfaces. Compared with the case where air is in contact with any one of the inclined surfaces and the detection light or the horizontal reflected light is totally reflected , the amount of the second reflected light received by the light receiving unit The leak sensor is configured to detect whether or not there is a leak by lowering, and when the leak is detected, the external output means notifies the leak by light or sound. . The liquid leakage sensor according to claim 1 ,
A liquid leakage sensor characterized in that only the light emitting portion corresponding to the detection point at which liquid leakage is first detected emits light, and the direction of occurrence of the liquid leakage with respect to the main body portion can be confirmed . The liquid leakage sensor according to claim 1 ,
Leakage sensor characterized in that it can detect normal or abnormal installation state of the main body with respect to the leak detection location based on the amount of reflected light received by the light receiving portions of the plurality of detection points. . The liquid leakage sensor according to claim 1 ,
The liquid leakage sensor, wherein the external output means is also used for notifying an abnormal installation state of the main body with respect to the liquid leakage detection place . The liquid leakage sensor according to claim 1 or 4 ,
A liquid leakage sensor characterized in that it is possible to distinguish between a liquid leakage detection state and an abnormal installation state of the main body by the light or sound of the external output means . The leak sensor according to claim 1 or 4 ,
A plurality of the main body portions are placed at the liquid leakage detection location, and the main body portion in a liquid leakage detection state and the main body portion in a liquid leakage non-detection state can be distinguished by light or sound of the external output means. Leak sensor characterized by being said . The leak sensor according to claim 1 or 4 ,
A plurality of the main body portions are placed at the liquid leakage detection place, and the main body portion in a normal installation state and the main body portion in an abnormal installation state can be distinguished by light or sound of the external output means. Leak sensor characterized by being .

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