JPS5985933A - Leaked water detecting device - Google Patents

Abstract

PURPOSE:To prevent the faults caused by forgetfulness in resetting, by automatically restoring a warning buzzer circuit beta, which is manually turned OFF, thereby automatically resetting the warning buzzer circuit under specified conditions, with a warning stopping switch being operated. CONSTITUTION:When a warning stopping switch Er is depressed, a warning stopping relay E is turned ON, a contact point (e) is changed, and the warning is stopped. A water leakage signal t1 from a timer circuit T1 and the signal from the contact point (e) are inputted to an amplifier A2. The amplifier A2 outputs a positive level signal based on the two signals, and operates the warning stopping realy E. A warning relay B is tunred OFF, and a buzzer A is stopped. When the flooded water is processed and an output a1 becomes a ''0'' level, an output t2 of a second timer circuit T2 is immediately returned to a ''0'' level. After 34sec, the outut of the timer circuit T1 becomes a ''0''. Accordingly, the output from the amplifier A2 becomes a ''0'' level. The warning stopping relay E is turned OFF, its contact point (e) is restored, and the circuit of the warning relay B is prepared.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a system in which two parallel conductors are arranged slightly apart from each other at a water leakage detection location, and when water leakage adheres between them, both conductors are short-circuited. Regarding the water leakage detection device that detects water leakage based on the change in the line resistance value of the parallel conductor, the alarm circuit is activated under certain conditions while the manual alarm stop switch is kept operating This automatically resets the alarm to prevent accidents caused by forgetting to return the alarm stop switch.

[Technical background of the invention and its problems]

In a conventional water leakage detection device, three conductors are mainly arranged parallel to the floor and slightly spaced apart from each other.

Then, water leakage occurs and the floor surface is flooded with water beyond a certain level (
When a water leakage (approximately 5fi) occurs, the two conductors are short-circuited by water, and a buzzer sounds based on the water leakage signal to issue a water leakage alarm. Then, the lifeguard manually activates the alarm stop switch, which consists of a toggle switch, and stops the alarm buzzer, which makes a constant noise. After the supervisor inspects and repairs the water leakage point, the alarm stop switch is returned to its original position and the alarm buzzer circuit is reset in preparation for the next water leakage alarm.

However, after inspecting and repairing a water leakage point, the watchman does not necessarily return the alarm stop switch to its original position. In particular, when inspection and repair take a long time and the work is handed over to another worker, it is common to forget to restore the alarm buzzer circuit after the work is completed. If a water leak were to occur again, the alarm buzzer would not sound, which could result in a major accident. Note that the alarm buzzer circuit and the water leak indicator lamp circuit are generally provided separately. Even if the warning buzzer is manually turned off to eliminate the noise, the water leakage message continues to be displayed. However, experience has shown that once the buzzer is turned off, the observer's attention is no longer directed to the indicator lamp. Moreover, the indicator lamps often break down. As mentioned above, even if the water leakage indicator lamp lights up when a water leakage accident occurs again, it is often not noticed. As a result, a serious accident could occur as mentioned above.

[Summary of the invention]

In view of the above-mentioned problems, the present invention automatically resets the alarm buzzer circuit under certain conditions while the alarm stop switch remains in operation. The purpose is to prevent accidents.

In this water leakage detection device, a detection band 4 is provided at a location to be detected, which is formed so that three conductors 1 and 2 slightly spaced apart from each other can be bridged by water leakage. The present invention also relates to a water leakage detection device that detects water leakage based on a change in the resistance value between the three conductors 1.2 and operates an alarm buzzer based on the water leakage detection signal a1.

Then, only when the alarm stop switch Er is manually operated and the water leakage detection signal a1 from the detection band 4 is input, the alarm buzzer circuit β is shut off, and the water leakage detection signal a1 continues for a certain period of time or more. This is a problem in that an auto-reset circuit W is provided which resets the alarm buzzer circuit β which has been cut off as described above when the alarm buzzer circuit β is no longer present.

Therefore, according to the present device, when the water leakage detection signal a1 is no longer present for a certain period of time or more due to the auto-reset circuit W, the vI alarm buzzer circuit β is manually shut off.
will be automatically restored.

Therefore, accidents caused by forgetting to return the alarm stop switch can be prevented, and an alarm buzzer can be emitted when a water leakage signal is input again.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a block diagram showing one embodiment of this device, and Fig. 2 shows a detection band 4 used as a sensor of this device on a wall surface 3.
FIG. 3 is an enlarged cross-sectional view taken along the line A--A in FIG. 2.

The sensor of the device consists of a flexible sensing strip 4, as shown in FIGS. 2 and 3, by way of example. This detection band 4 consists of two conductors 1.2 (stainless steel wires) on the surface of a band-shaped insulating rubber.
The conductors are arranged in parallel with a slight distance (for example, about 1 to 8 fi), and the surface of the conductor is exposed by 1°2. Then, as shown in the figure, the detection band 4 having two parallel lines is horizontally disposed on the wall surface 3 using an adhesive or a fastener. Then, one ends of these two parallel conductors 1 and 2 are connected to a terminal COM and a terminal DC (or terminal AC), respectively, as shown in FIG. Thus, water leakage is detected based on the change in electrical resistance between the parallel conductors 1°2. That is, when leakage water 6 drips onto the detection band 4 as shown in Figure 3, the parallel conductors 1 and 2 are short-circuited, and the electrical resistance between them is significantly reduced.The input signal 1 is generated based on the decrease in the resistance value. input to the amplifier A1, and its output is input to the second timer circuit T2. timer circuit TI,
The signals are input to the counter circuit C, respectively. In addition, both timer circuits T
I and T2 have variable resistors R1 and R2, respectively, and the set time can be changed as appropriate by the variable resistors. For example, in the second timer circuit T2, the set time is 2
It shall be possible to change between seconds and 60 seconds. Further, as an example, in the timer circuit T1, the set time can be changed between 2 seconds and 34 seconds.

This allows each set time to be selected depending on the humidity at the water leakage detection location and the surface temperature of the tank or the like.

Therefore, if the setting time of the timer circuit T1 is 34 seconds, when the time between one input signal a1 and the second input signal a1 that is input subsequently is 34 seconds or more, the timer circuit T1
1 outputs a signal t1 for resetting the counter circuit C.

Thereby, the first input signal is not counted. Next, the counter circuit C is based on the peak change in the electrical resistance value (
This circuit integrates the number of - input signals a1, and is connected to the switch circuit SW. And switch circuit SW
Terminals 1 to 9 are provided, and an appropriate terminal is selected.

Then, when the counter number reaches the number of the terminal number, a negative pulse is output from the terminal. - For example, if terminal number 7 is selected, the signal S is output from the switch circuit SW and the alarm circuit F is operated by seven input signals.

In this embodiment, terminal No. 9 of the switch circuit SW is selected, and at the 9th count, the switch circuit SW outputs the signal S, which is transmitted to the alarm circuit F made of a flip-flop circuit, etc.
is input. Further, in the present embodiment, the set time of the second timer circuit T2 is selected to be 60 seconds, as an example. Therefore, the detection pot 4 is submerged and its line resistance continuously decreases,
When it continues for 60 seconds, the signal t2 is sent to the switch circuit S.
It is input to the alarm circuit F via W. Then,
The output terminal f of the alarm circuit F is inverted to 0 potential (or negative potential), energizes the alarm buzzer circuit β, and its contact turns ON to sound the alarm buzzer. At the same time, the operation of the contacts is recorded on a time recorder K, and the operation time and the like are recorded.

Next, an auto-reset circuit W is provided on the output side of the alarm circuit F. This auto-reset circuit W is connected to the amplifier A.
2, a buzzer stop switch Er, and an alarm stop relay E. This buzzer stop switch Er is an automatic return type push button switch, and by actuating the switch Er, first the alarm relay E is activated and its contact e is switched to the amplifier A2 side. And e
The alarm stop relay E is self-held by the amplifier A2, which outputs only when the input from the timer circuit T1 and the water leakage signal t1 from the timer circuit T1 are input. At the same time, the signal from the amplifier A2 is input to the reset terminal of the alarm circuit F, and the level of the output terminal f of the alarm circuit F is inverted and reset. When the restoration of the water leak location is completed in this state, the water leak signal a1 ceases to exist.

Then, after 34 seconds have elapsed from that point, the water leakage signal t1 of the timer circuit T1 disappears. Then, the alarm stop relay E becomes 0FFL and its contact automatically returns to the W!buzzer circuit β side.

[Action of the invention]

Next, the operation of the present invention will be explained.

For an experiment, water droplets were deposited one by one at intervals of several seconds on the outer wall surface 3 of a tank or the like from an experimental water supply pipe 5 as shown in FIG. 2 under the same conditions as for a water leak. Then, the water droplets 6 instantaneously short-circuit between the parallel conductors 1 and 2, as shown in FIG. 3, and fall downward. At this time, the change in resistance value r between the parallel conductors 1 and 2 appears as shown in FIG. As is clear from the change in r in FIG. 4, at the first water droplet N1, the inter-conductor resistance decreases to a peak, and then immediately as the water droplet flows out, the line-to-line resistance value increases. However, in a dry state, the resistance value does not decrease and becomes about 2MΩ. Next, at the time of the water droplet N2 at the mouth of the second bay, a peak resistance decrease occurs, and the water droplet partially flows downward. However, since the first water droplet remains slightly between the lines, the movement of the second water droplet appears completely different from that of the first water droplet. As a result, the resistance value may actually decrease over time as shown in FIG. Then, another peak-like change appears at the third water droplet N3. Then, N4. As with N5, each time a water droplet is dropped, a different resistance change curve appears. This resistance change r is input as a signal i to the first amplifier A1. Then, the output a1 appears as shown in the lower graph of FIG. Thus, the amplifier A1 is configured to characteristically capture the peak change in each resistance value. At the same time, it is configured to maintain a constant level of output in a submerged state where the two-handed conductors 1.2 are continuously short-circuited. FIG. 5 shows a time chart of the present device in a state where water droplets are dripping onto the detection band 4. In this embodiment, the alarm circuit F is configured to activate and sound a buzzer when the interval between drops of each water droplet (Nl, N2, etc.) is within 34 seconds and the number of water drops is 9. Therefore, in FIG. 5, since the interval between the water droplet NO and the water droplet N1 is 34 seconds or more, the counter circuit C is reset and starts counting from the water droplet N1.

Then, the water droplet N9 at the mouth of the ninth bay activates the alarm circuit F, and the alarm buzzer sounds. Next, if the next water drop does not fall even after 34 seconds or more have elapsed after the N9 at the mouth of the ninth bay has flowed down, the alarm circuit F returns to the original state and stops the alarm buzzer from sounding. Therefore, according to this device, the water droplets generated at the beginning of water leakage can cause the detection device to operate and issue an alarm. At the same time, this device will not issue an alarm due to water droplets that have relatively long dripping intervals, such as condensed water dripping from the ceiling or the outer surface of the tank.

Furthermore, this alarm device will not issue false alarms due to lightning or noise signals generated when equipment stops driving. This is because, generally, a predetermined number (for example, nine) of these noise signals do not occur consecutively within the time set by the timer circuit T1.

Next, FIG. 6 is a flowchart of the present apparatus when the detection band 4 is continuously short-circuited due to water leakage. That is, it shows the operation during submergence. At the time of submergence, the output signal a1 from the first amplifier A1 becomes a constant level output as shown in FIG. The alarm circuit F is operated through the alarm circuit F.

Then, a warning buzzer sounds.

Then, when the alarm stop switch Er is pressed, the alarm stop relay E is turned on, and its contact e is switched to stop the alarm, and the alarm stop relay E is self-held. That is, the water leakage signal t1 of the timer circuit T1 and the signal from the contact e are input to the amplifier A2, and the presence of both signals causes the amplifier A2 to output a positive level, thereby activating the alarm stop relay E. At the same time, alarm relay B goes to 0FFL.
, the buzzer stops. Further, the output from the amplifier A2 is input to the reset terminal of the alarm circuit F, and the level of the output terminal f of the alarm circuit F is inverted.

Next, at time y in FIG. 6, the submergence of the detection zone 4 is treated and the output a1 is set to O level.

Immediately, the output t2 of the second timer circuit T2 returns to 0 level. At the same time, after 34 seconds, timer circuit T1
The output of becomes 0. Accordingly, the output from amplifier A2 becomes 0 level. Then, alarm stop relay E turns OFF.
F L, its contact e returns and the alarm relay B circuit is prepared. Therefore, even if the alarm stop switch remains in use, the alarm circuit will automatically reset and issue an alarm in case of water leakage again.

That is, in this embodiment, it is possible to prevent an accident in which an alarm is not issued when water leaks again due to forgetting to return the alarm stop valve as in the conventional case.

In this case, the alarm buzzer circuit β is energized via the counter circuit C and the switch circuit SW. Along with that,
The fact that the water leakage signal t1 is also output from the timer circuit TI is the same as in the case of flooding. Therefore, N'
When the A stop switch Er is manually pressed, the alarm stop relay E is activated and its contact e is switched to the amplifier A2 side, and the alarm stop relay E is self-held in the same manner as described above. Then, the alarm buzzer circuit β is cut off.

Next, when the water leakage location in the dripping state is repaired and restored, the pulsed water leakage detection signal a1 disappears. Then,
34 seconds after that time, the water leakage signal t of the timer circuit T1
1 disappears, the alarm stop relay E goes to 0FFL, and its contact e returns to restore the alarm buzzer circuit β. Then,
A warning can be issued in case of water leakage again. In addition,
The present invention is of course not limited to the above-mentioned embodiments. For example, instead of inputting the output t1 from the timer circuit T1 to the amplifier A2 in FIG. Then, the output thereof may be input to amplifier A2. In this case, the third timer circuit has a much longer set time than the two timer circuits. Thereby, the alarm buzzer circuit β may be reset after waiting for water droplets on the tank surface to dry after the water leakage point has been repaired. Thereby, a more rational auto-reset circuit W is obtained.

Further, subsequent experiments revealed that by forming the cross-sectional shape of the detection band 4 as shown in FIGS. 7 to 14, each curve of r in FIG. 4 changes more peak-like.

〔Effect of the invention〕

In the water leakage detection device of the present invention, the alarm circuit is shut off only when the buzzer stop switch Er is manually activated and the water leakage detection signal a1 from the detection band 4 is input. Along with that,
An auto-reset circuit W is provided that resets the alarm circuit that has been shut off when the water leakage detection signal a1 continues to be absent for a predetermined period of time or more.

This device has the above configuration and has the following effects.

Tll This detection device has an auto-reset circuit W, so if the water leakage detection signal does not exist for a certain period of time or more (
When this happens, the alarm buzzer circuit that was manually shut off is automatically reset. Therefore, if a water leakage accident occurs again, the alarm buzzer will sound immediately, making it possible to know about the accident. Therefore, there is an effect of preventing accidents caused by forgetting to return the alarm stop switch Er manually.

(2) Also, the warning buzzer circuit is activated when the water leakage detection signal a1 continues for a certain period of time and ceases to exist. Therefore, when the water leak detection signal a1 ceases to exist for a relatively short period of time due to various causes during water leak repair work, the alarm buzzer circuit is not reset. The reason for doing this is as follows. For example, assume that a water leakage point has been repaired and the moisture only on the detection band 4 and its periphery is wiped with a cloth. At that time, if the alarm buzzer circuit were to be reset immediately, the moisture remaining on the upper part of the tank wall would flow down and short-circuit the detection body 4 again. Then, the warning alarm goes off, surprising the lifeguards. Generally, the monitoring location and the water leakage detection location are located in separate locations, resulting in unnecessary confusion in communication between the two. However, in the present invention, if the water leakage detection signal a1 does not exist for a short period of time as described above, the alarm buzzer circuit is not activated, so that the above-mentioned confusion is prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the water leak detection device of the present invention, Fig. 2 shows an embodiment in which a detection band 4 used at the detection end of the detection device is attached to a wall surface 3, and Fig. 3 shows an embodiment of the water leakage detection device of the present invention. The cross-sectional view taken along the line A-A in Fig. 2, and Fig. 4 show the changes in the electrical resistance between the parallel conductors 1 and 2 when water drops are dropped onto the detection band 4 one by one at intervals of several seconds, and the changes in the electrical resistance at that time. Amplifier A1 in Figure 1
The horizontal axis shows time and the vertical axis shows the resistance value or potential. Figure 5 is a time chart of this device when water leaks in a dripping state, and Figure 6 shows when water leaks across detection zone 4. A time chart when submerged in water, Figures 7 to 13 are enlarged cross-sectional views showing other experimental examples of the detection band 4 used in this device, and Figure 14 is a plan view of the main part of an experimental example at the same location. Enlarged view. 1.2...Conductor, 3...Wall surface, 4...Detection band, 5
...Water supply pipe, 6...Water drop, 7...Small groove, C...
Counter circuit, T1... timer circuit, T2... second
Timer circuit, F...Alarm circuit, Er...Alarm stop switch, E...Alarm stop relay, B...Alarm relay, Al, A2...Amplifier, SW...Sui Nochi circuit , S... Rectifier, K... Time recorder, β.
...Alarm buzzer circuit, W...Auto-reset circuit. Agent Patent Attorney Kubo 1) Takumi Figure 2 5

Claims (1)

[Claims] A detection band (4) configured so that water leakage can bridge between the three conductors (1) and (21), which are slightly spaced apart from each other, is installed at the detection location, and the three conductors (1) and (21) are Water leakage is detected based on the change in resistance value, and the water leakage detection signal (al) is
In a water leak detection device that activates an alarm buzzer, the alarm buzzer circuit is activated only when the buzzer stop switch (Er) is manually activated and the water leak detection signal (al) from the detection band (4) is input. (β), and an auto-reset circuit (W
) Water leakage detection device.