JP2002295905A - Abnormality detector for water-quantity sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector for water-quantity sensor that can detect the abnormal state of a water-quantity sensor in an early state. SOLUTION: The water-quantity sensor 7 has an impeller which is rotated by a water flow passing through a water supply pipe 5 and a magnetic sensor which outputs a pulse signal of the period corresponding to the number of revolutions of the impeller and outputs a pulse signal of a frequency proportional to the quantity of water supplied to the pipe 5. An abnormality detecting means 41 for water-quantity sensor installed to a controller 2 detects the period of the pulse signal outputted from the sensor 7 at every pulse and, when the period T of detected one pulse changes beyond the range (1/2TB<=T<=2TB) from 1/2 to two times of the average period TB of the six pulses immediately before the pulse, notifies the abnormal state of the sensor 7 by means of a loudspeaker 34 and a buzzer 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an abnormality of a water quantity sensor for detecting a flow rate of water flowing in a water supply pipe.

[0002]

2. Description of the Related Art Conventionally, a water heater that generates water by heating water supplied from a water supply pipe connected to a water pipe is provided with a water quantity sensor for detecting a flow rate of water supplied from the water supply pipe. Things are known. In the fed-hot water unit,
When the water amount sensor detects a water amount equal to or more than a predetermined amount, it is determined that water supply from the water supply pipe has started, and heating of the water is started. When the water amount detected by the water amount sensor becomes less than the predetermined amount, water supply is performed. It is determined that the water supply from the pipe has been stopped, and the heating of the water is terminated.

[0003] Here, the water sensor, an impeller rotated by the flowing water passing through the water supply tube provided in the water supply pipe, a pulse signal for outputting a pulse signal with a period corresponding to the rotational speed of the impeller Output means.

The water heater detects the amount of water supplied from the water supply pipe by detecting the cycle of the pulse signal. However, foreign matter such as dust may enter the water flowing in the water supply pipe.
When these foreign matters adhere to the impeller, the load on the impeller increases, the correlation between the actual water amount and the cycle of the pulse signal deviates from the initial state, and the accuracy of detecting the water amount by the water amount sensor deteriorates.

That is, the amount of water detected by the water amount sensor becomes smaller than the actual amount of water. Then, the detection accuracy of the amount of water to become progressively worse as the adhesion of foreign matter into the impeller is increased, when the user continues to use the water heater without realizing it, from said water supply pipe eventually actually In spite of the fact that water is supplied with a water amount equal to or larger than a predetermined amount, the amount of water detected by the water amount sensor becomes less than the predetermined amount, and there is a disadvantage that the water heater is not heated by the water heater.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for detecting an abnormality in a water sensor which can detect an abnormality in the water sensor at an early stage.

[0007]

To achieve the above object, according to an aspect of the first aspect of the present invention includes an impeller rotated by the water flow passing through the water supply tube provided in the water supply pipe, of the impeller A signal output means for outputting a pulse signal of a cycle according to the number of rotations, a device for detecting an abnormality of the water amount sensor, the cycle of the pulse signal is detected for each pulse,
An abnormality notifying unit for notifying when the detected period of the one pulse changes from the average period of the last one pulse of the first predetermined number beyond the first predetermined range. .

According to the present invention, the foreign matter adheres to a part of the impeller, causing uneven rotation of the impeller, and accordingly, the cycle of the pulse signal changes beyond the first predetermined range. Then, notification is performed by the abnormality notification means. Therefore, it is possible to prompt the user to check the water amount sensor at an initial stage when the foreign matter adheres to the impeller.

Further, a plurality of magnetic poles are attached to the impeller at intervals in a rotation direction of the impeller, and the pulse signal output means is arranged to face each of the magnetic poles when the impeller rotates. The magnetism detecting means is provided, and the pulse signal is output by one pulse each time the magnet is detected by the magnetism detecting means. The notification is performed when the number of magnetic poles changes from the cycle of one pulse detected earlier by a number exceeding the second predetermined range.

[0010] According to such present invention, details will be described later, said some of the plurality of magnetic poles is broken, become Until a state in which a part is lacking in succession the pulse signal which has been output And when the magnetic pole is cracked and two or more pulses are detected for one magnetic pole, the period of one detected pulse is changed from the one pulse to the number of the magnetic poles. A change is made from the cycle of one pulse detected earlier by a minute to exceed the second predetermined range, and the abnormality is notified by the abnormality notification means. Therefore, at the initial stage when the magnetic pole is damaged, the magnetic pole user can be urged to repair the water amount sensor.

In order to avoid erroneous detection of an abnormality of the water amount sensor due to a change in the amount of water supplied to the water supply pipe,
When the first predetermined range cannot be set to a very narrow range, the period of one pulse detected even if the magnetic pole is damaged is calculated from the average period of the immediately preceding first predetermined number of pulses. It may not change beyond the range.
Therefore, by combining the process of comparing the period of the pulse period of the pulse detected in accordance with the present invention has been previously detected by the number fraction of the pole, even in such a case,
It is possible to reliably detect breakage of the magnetic pole and to notify an abnormality of the water amount sensor.

Further, the water supply pipe is for supplying water to the water heater, and the water heater is configured to supply one second pulse of the second predetermined number of the pulse signals output from the pulse signal output means. Heating the water supplied from the water supply pipe to generate hot water when the average cycle of the pulse signal becomes equal to or less than a predetermined value, and the abnormality notifying means outputs one pulse of the pulse signal having a cycle longer than the predetermined value. The abnormality notification is performed when a third predetermined number or more are detected within a predetermined time.

According to the present invention, foreign matters adhere to the impeller and the like, and the rotation of the impeller becomes uneven, and the average period of the second predetermined number of pulses is equal to the predetermined cycle. When one or more pulses having a period equal to or less than the value but equal to or greater than the predetermined value are detected within the predetermined time, the abnormality notification unit can notify the third predetermined number or more.

Further, according to the present invention, when the pulse signal is being output at a period near the predetermined value, the abnormality notification means may exceed the first predetermined range and the second predetermined range. Detecting that the period of one pulse of the pulse signal has changed to a predetermined value or more,
It can inform the abnormality of the water sensor.

According to a second aspect of the present invention, there is provided an impeller provided in a water supply pipe, rotated by flowing water passing through the water supply pipe, and provided with a plurality of magnets at intervals in a rotation direction; Pulse signal output means having magnetic detection means provided so as to face each of the magnets when the car rotates, and outputting one pulse signal each time the magnet is detected by the magnetic detection means; An apparatus for detecting an abnormality of a water amount sensor provided with a pulse signal having a period of 1
Abnormality notification means for performing notification when a cycle of the detected one pulse is detected for each pulse and the cycle of the detected one pulse changes by more than a predetermined range from a cycle of one pulse detected by the number of magnets before the one pulse. It is characterized by having.

According to the present invention, similarly to the above-described first embodiment, it is possible to notify the user when the magnetic pole is damaged and to prompt the user for repair.

Further, an impeller provided in a water supply pipe for supplying water to the water heater and rotated by a water flow passing through the water supply pipe, and a pulse for outputting a pulse signal having a cycle corresponding to the rotation speed of the impeller An apparatus for detecting an abnormality of a water amount sensor provided with signal output means, wherein the water heater is configured such that when an average period of a first predetermined number of consecutive pulses of the pulse signal becomes equal to or less than a predetermined value. When the water supplied from the water supply pipe is heated to generate hot water, and when a predetermined number or more of the pulse signals having a cycle longer than the predetermined value are detected within a predetermined time, an abnormality notification is performed. It is characterized by having an abnormality notification means.

According to the present invention, similarly to the above-described first embodiment, when the rotation unevenness of the impeller occurs, the abnormality of the sensor can be detected and the user can be notified.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a water heater including a function of an abnormality detection device for a water amount sensor of the present invention, FIG. 2 is a configuration diagram of the water amount sensor shown in FIG. 1, and FIG. 3 is a change in a pulse signal output from the water amount sensor. FIG. 4 to FIG.
FIG. 5 is a flowchart of the abnormality detection processing of the water amount sensor.

Referring to FIG. 1, the overall operation of water heater 1 is controlled by controller 2, burner 3 operated by a control signal from controller 2, heat exchanger 4 heated by burner 3, water supply not shown. A water supply pipe 5 connected to the pipe to supply water to the heat exchanger 4, a water quantity servo 6 for adjusting an opening degree of the water supply pipe 5 by a control signal from the controller 2, and a flow rate of water passing through the water supply pipe 5 is detected and detected. A water quantity sensor 7 for outputting a signal to the controller 2, a hot water supply pipe 8 from which hot water heated by the heat exchanger 4 is supplied, a bypass pipe 9 for mixing a part of water supplied to the water supply pipe 5 into the hot water supply pipe 8, A bypass servo that adjusts the opening of the bypass pipe according to a control signal from the controller, detects a temperature of hot water downstream of a junction of the hot water supply pipe and the bypass pipe, and outputs a detection signal to the controller; A hot water supply temperature sensor 11, a heat exchange temperature sensor 12 that detects the temperature of hot water near the outlet of the heat exchanger 4 and outputs a detection signal to the controller 2, and a controller that detects abnormal overheating of the heat exchanger 4 and controls the detection signal. 2 is provided.

Furthermore, water heater 1, the combustion fan 1 in which the rotational speed is controlled by the control signal from the controller 2
4, a spark plug 15 that generates a spark discharge according to a control signal from the controller 2 and ignites the burner 3,
And a frame rod 16 for detecting the combustion state of the controller 2 and outputting a detection signal to the controller 2.

A gas supply pipe 17 for supplying fuel gas to the burner 3 has a source gas solenoid valve 18 and a hot water supply gas solenoid valve 19, which are opened and closed by a control signal from the controller 2.
20, and a gas proportional valve 21 whose opening degree is adjusted by the control signal from the controller 2 is provided.

Further, 30 is a remote controller that is communicatively connected to the controller 2, the operation switch 31 for switching the entire water heater 1 in the driver standby state and the operating state, to hot water supply pipe 22 which communicates with the hot water supply pipe 8 A hot water temperature setting switch 32 for setting a target hot water temperature, a display unit 33 for displaying the actual hot water temperature to the hot water supply pipe 22 and the like, a speaker 34 for outputting voice guidance, and a buzzer 35 are provided.

Next, the operation of the water heater 1 will be described.
When the water heater 1 is connected to a commercial power supply (not shown), the controller 2 and the remote controller 30 start operating, and the water heater 1 enters an operation standby state. When the user turns on the operation switch 31 of the remote controller 30 in this operation standby state, the water heater 1 switches from the operation standby state to the operation state, and the hot water temperature setting switch 32 of the remote controller 30 can be operated.

After the user operates the hot water supply temperature setting switch 32 to set the target hot water supply temperature and then opens the callan 23 connected to the tip of the hot water supply pipe 22, a water pipe (not shown) is opened.
Then, the water supply to the water supply pipe 5 is started, and the amount of water flowing to the water supply pipe 5 is detected by the water amount sensor 7.

When the controller 2 recognizes the start of water supply to the water supply pipe 5 based on the detection signal output from the water amount sensor 7, the controller 2 activates the combustion fan 14 to generate spark discharge in the ignition plug 15 and returns to the original state. gas solenoid valve 18, and opens the hot water supply gas solenoid valves 19 and 20 performs the ignition process of the burner 3.

The hot water supply control means 40 provided in the controller 2 matches the target hot water supply temperature set by the hot water temperature setting switch 32 with the actual hot water supply temperature to the hot water supply pipe detected by the hot water supply temperature sensor 11. As described above, the hot water supply operation for controlling the combustion amount of the burner 3 and the bypass ratio which is the ratio of the amount of water supplied to the bypass pipe 9 to the amount of water supplied to the heat exchanger 4 is started.

Thereafter, when the hot water supply control means 40 recognizes from the detection signal of the water quantity sensor 7 that the curan 23 has been closed by the user and the water supply from the water supply pipe 5 has been stopped, the hot water supply control means 40 The hot water supply electromagnetic valves 19 and 20 are closed, the operation of the combustion fan 14 is stopped, and the hot water supply operation ends.

Next, as shown in FIG. 2A, the water amount sensor 7 rotates between a first bearing 51 and a second bearing 52 mounted in a hollow main body 50 through which water passes. An impeller 53 is provided freely, and a magnet 54 is integrally attached to the impeller 53. The impeller 53 is configured to rotate by a water flow passing through the main body 50.

As shown in FIG. 2B, six magnetic poles M1 to M6 are provided at equal intervals around the magnet 54, and as shown in FIG. When the magnet 54 is rotated by the rotation of the magnet 53, the magnetic poles M1 to M1
A magnetic sensor 55 is provided such that M6 faces each other. Then, the magnetic sensor 55 outputs a high-level voltage when detecting any one of the magnetic poles M1 to M6, and outputs a low-level voltage when not detecting.

Therefore, when the magnet 54 rotates,
Pulse signal having a period corresponding to the rotational speed (high /
Binary low level of the pulse signal) is a magnetic sensor 5
5 is output. Since the rotation speed of the impeller 53 is proportional to the amount of water passing through the main body 50, the magnetic sensor 55
It is possible to detect the amount of water supplied to the water supply pipe 5 from the frequency of the pulse signal output from. Note that a rectifier 56 is provided on the inlet side of the water amount sensor 7 and a governor 57 is provided on the outlet side.

Here, when the hot water supply control means 40 detects that the amount of water supplied from the water supply pipe 5 has become equal to or more than a predetermined amount from the detection signal of the water amount sensor 7, it determines that water supply has started, and determines that the hot water supply has started. Start driving. Therefore, the water sensor 7
It is necessary to detect the water supply amount with a certain degree of accuracy, but foreign matter such as dust may be mixed in the water supplied from the water pipe to the water supply pipe 5. Therefore, there is a case where the mesh on the inlet side of the water sensor 7, it is difficult to remove all foreign matter the mesh, also, in some cases the mesh foreign matter is mixed with torn.

If the contaminated foreign matter adheres to the impeller 53 or between the impeller 53 and the first bearing 51, the rotational load of the impeller 53 increases, and the amount of water supplied from the water supply pipe 5 is reduced. The detection accuracy deteriorates, and in extreme cases, although water is actually supplied from the water supply pipe 5 with a water amount exceeding the predetermined amount, this is not detected by the water amount sensor 7 and the hot water supply operation is not performed. It becomes a state.

Therefore, in order to prevent such a situation, the water amount sensor abnormality detecting means 41 provided in the controller 2 detects the abnormality of the water amount sensor 7 in the initial stage when the detection accuracy of the water amount sensor 7 starts to deteriorate. Is detected, and the user is notified of the occurrence of the abnormality, and processing for prompting inspection and cleaning of the water amount sensor 7 is performed. Hereinafter, the abnormality detection processing of the water amount sensor 7 by the water amount sensor abnormality detection means 41 will be described with reference to FIGS.

FIG. 3 is a diagram showing pulse signals output from the water amount sensor 7 when the water amount sensor 7 is operating normally and when the water amount sensor 7 is abnormal. When water sensor 7 is normally operating, as shown in (1), the period of each pulse is output constant pulse signals. On the other hand, if foreign matter adheres to the impeller 53 or the like,
Since the rotation of the impeller 53 becomes uneven, the period of each pulse varies as shown in (2),
As shown in (3), the pulse is interrupted on the way. In the drawing, P1 to P6 correspond to pulse signals output from the magnetic sensor 55 in response to detection of the magnetic poles M1 to M6 (see FIG. 2B) of the magnet 54, respectively.

If one of the magnetic poles M1 to M6 is broken and chipped, one pulse (P3 in the figure) is cut off as shown in (4). The magnetic poles M1 to M6
If one of them (M3 in the figure) is damaged and cracked,
As shown in (5), two or more pulses are output.

Therefore, the water quantity sensor abnormality detecting means 41
By detecting these states, the abnormality of the water amount sensor 7 is detected at an initial stage. Hereinafter, the execution procedure of the abnormality detection processing of the water amount sensor 7 by the water amount sensor abnormality detection means 41 will be described with reference to the flowcharts of FIGS.

When the user turns on the operation switch 31 (see FIG. 1) provided on the remote controller 30, the controller 2 is in an operation state, and six pulses of the pulse signal output from the water amount sensor 7 in STEP1 of FIG. Second embodiment of the present invention
Wait for the average frequency of the predetermined number and the first predetermined number to become higher than 29 Hz. Note that this 2
The value of 9 Hz is the frequency of the pulse signal output from the water amount sensor 7 when the amount of water supplied to the water supply pipe 5 is 2 liters / minute.

The frequency of the pulse signal is 29 Hz
Is exceeded, that is, when the amount of water supplied to the water supply pipe 5 exceeds 2 liters / minute,
3 is opened and it is determined that the water supply to the water supply pipe 5 has been started, and the process proceeds to STEP 2, where the hot water supply operation is started by the hot water supply control means 40.

Next STEP 3 to STEP 11 and FIG.
STEP30-STEP32 and STEP40-STE
P42 is a process by water sensor abnormality detecting means 41, water sensor abnormality detecting means 41, to start the 1 minute timer in STEP3, in STEP4 counter (CNT)
Is reset (CNT = 0).

Then, in the following STEP 5, the water amount sensor 7
The cycle T of the pulse signal output from the CPU is detected for each pulse. If the cycle T exceeds 34 msec in STEP 6, the process branches to STEP 30 in FIG. Also, the next ST
If the cycle T is 100 msec or more in EP7, S
The process branches to TEP 20, and hot water supply control means 40 ends the hot water supply operation.

[0042] In this case, 34msec in STEP6
Is a reference value for determining the water supply to the hot water supply pipe 5 is being made, as described above. Also, 100 msec in STEP 7 is assumed to be the cycle of the pulse signal output from the water amount sensor 7 when the user performs the operation of closing the curan 23 (the period becomes longer as the amount of water supplied to the hot water supply pipe 5 decreases). The set time. Period T is 100m
When it becomes longer than sec, it is determined that the curran 23 is closed and the water supply to the water supply pipe 7 is stopped, and the hot water supply control means 40 ends the hot water supply operation in STEP20.

On the other hand, in step 7, the period T is 100 ms.
c, that is, the period T is 34 msec.
(Corresponding to the predetermined value of the present invention) longer than 100mse
If it is within the range shorter than c, the process proceeds to STEP 8 and the counter (CNT) is counted up. Then, if the count value of the counter (CNT) has not reached 5 in the next STEP 9, the process returns to STEP 5, and if the count value has reached 5, the process proceeds to STEP 10.

[0044] When the one minute timer has been time up in STEP10, the process returns to STEP3, again STEP3
~STEP10 of the loop is executed. Meanwhile, STEP
When the one minute timer has not expired at 10,
That is, five pulses whose period T is longer than 34 msec and shorter than 100 msec within one minute (corresponding to the predetermined time of the present invention) (corresponding to the third predetermined number and the second predetermined number of the present invention) When counted, the STE
Proceeding to P11, the water amount sensor abnormality detecting means 41 sounds the buzzer 35 and outputs a sound (for example, “an abnormality of the water amount sensor 7 has occurred”) from the speaker 34 to notify that an abnormality has occurred in the water amount sensor 7. Output from

Thus, during the hot water supply operation, as shown in FIG. 3 (2), the pulse P3 having a long cycle T (34 msec)
If <T ₁₃ <100 msec) is output five times or more per minute, and it can be determined that the rotation of the impeller 53 is uneven, the user can be prompted to check and clean the water amount sensor 7.

[0046] Incidentally, during the execution of the hot water supply operation, the controller 2 calculates the average period of six successive pulses of the pulse signal output from the water amount sensor 7 the average period 34m
Monitors whether a sec (29Hz) or more, the average period is completed the hot water supply operation is stopped the combustion of the burner 3 is when it becomes a more 34Msec.

In step 6, the pulse period T is 34.
When shorter than msec, i.e., when the water supply to the water supply pipe 5 is determined to have been performed, STEP 30
Branches, the period T is compared with the period T _B of the previous 6 pulses pulse. Then, in STEP31, the period T is the period T
_If the value exceeds a range longer than 1/2 of _B and shorter than 2 times (corresponding to a second predetermined range of the present invention), ST
Proceeding to EP32, the water amount sensor abnormality detecting means 41 performs abnormality notification of the water amount sensor 7 in the same manner as in STEP 11 described above.

As a result, as shown in FIG.
The magnetic pole M3 (see FIG. 2B) is damaged and the magnetic sensor 55
(See FIG. 2 (a)), the state is not detected, and the pulse P3 corresponding to the magnetic pole M3 is missing ((P
3)), when the period of the pulse P2 (T ₃₂₎ is more than double the period of six pulses previous pulse P2 (T ₃₁₎ is detected, abnormality notification of water sensor 7 is performed.

As shown in FIG. 3 (5), the magnetic pole M
3 (see FIG. 2B), and two pulses are output corresponding to the magnetic pole M3.
When it is detected that the cycle of the cycle 3 (T ₄₂ ) is 以下 or less of the cycle (T ₄₁ ) of the pulse P 3 six pulses before, the abnormality of the water amount sensor 7 is notified.

Next, beyond the range shorter than 2 times longer than a half of the period T _B of the period T is 6 pulses previous pulse _{(1/2 · T B <T <} 2T B) in STEP31 change when not in branches to STEP 40, water sensor abnormality detecting means 41 calculates the average period T _a of the content (corresponding to a first predetermined number of the present invention) 6 pulse immediately before. And
2 fold range (1/2 of the average period T _A 1/2 subsequent STEP41 with a period T is the average period T _A T _A ≦ T ≦ 2T _A,
If the value exceeds the range (corresponding to the first predetermined range of the present invention), the process proceeds to STEP 42, and the abnormality of the water amount sensor 7 is notified as in STEP 11 described above.

As a result, as shown in FIG. 3C, the period (T ₂₁ , T _21)
22 ,..., T ₂₅ ) is changed (T ₂₆ ), the abnormality of the water amount sensor 7 is notified.

In the present embodiment, as shown in the flowcharts of FIGS.
When the following pulse 100msec has been detected five or more above 4msec (STEP3~STEP11), shorter range than 2 times longer than a half of the period T _B of the period T is 6 pulses previous pulse (T _B < T <T _B ) (STEP 30 to STEP 32) and the period T
Has changed beyond the range (T _A ≦ T ≦ T _A ) of １ ／ to twice the average period T _A of the immediately preceding six pulses (STEP 4).
0 to STEP 42), the abnormality of the water amount sensor 7 is detected, and any one of the conditions may be detected to detect the abnormality of the water amount sensor 7. Any of the two conditions may be detected to detect an abnormality of the water amount sensor 7.

Further, in the present embodiment, an example has been shown in which an abnormality of the water amount sensor 7 attached to the water supply pipe of the water heater 1 is detected. However, the present invention is not limited to this example, and the invention is not limited to this example. The present invention can be widely applied when detecting an abnormality of the water amount sensor.

Also, when the amount of water supplied to the water supply pipe 5 becomes 2 liters / minute or more, it is turned on separately from the water amount sensor 7.
The water flow switch provided, despite the water flow switch is turned ON, when the frequency of the pulse signal output from the water amount sensor 7 is less than 29Hz (frequency corresponding to 2 liters / min), water The abnormality of the sensor 7 may be notified.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a water heater according to the present invention.

Figure 2 is a configuration diagram of a water sensor shown in FIG.

FIG. 3 is a diagram showing a change in an output pulse output from a water amount sensor.

FIG. 4 is a flowchart of a water amount sensor abnormality detection process.

FIG. 5 is a flowchart of a water amount sensor abnormality detection process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water heater, 2 ... Controller, 3 ... Burner, 4 ... Heat exchanger, 5 ... Water supply pipe, 6 ... Water amount servo, 7 ... Water amount sensor,
8: Hot water supply pipe, 9: Bypass pipe, 10: Bypass servo,
11 ... hot water temperature sensor, 12 ... heat exchanger temperature sensor, 13 ...
Overheat detection sensor, 14: combustion fan, 15: spark plug, 16: frame rod, 17: gas supply pipe, 18 ...
Source gas solenoid valve, 19, 20 hot water supply gas solenoid valve, 21 gas proportional valve, 30 remote control, 40 hot water supply control means, 41
... Water amount sensor abnormality detecting means, 53 ... Impler, 54 ... Magnet

Claims (5)

[Claims] 1. An amount of water comprising an impeller provided in a water supply pipe and rotated by a water flow passing through the water supply pipe, and signal output means for outputting a pulse signal having a cycle corresponding to the rotation speed of the impeller. An apparatus for detecting an abnormality of a sensor, wherein a period of the pulse signal is detected for each pulse, and a period of the detected one pulse is calculated based on an average period of a preceding first predetermined number of one pulse. An abnormality detection device for a water quantity sensor, comprising: abnormality notification means for notifying when a change has occurred beyond a predetermined range. 2. A plurality of magnetic poles are attached to the impeller at intervals in the direction of rotation of the impeller, and the pulse signal output means is arranged to face each of the magnetic poles when the impeller rotates. The magnetism detecting means is provided and outputs one pulse of the pulse signal each time the magnet is detected by the magnetism detecting means.
When the number of the magnetic poles has changed from the pulse by a number exceeding the second predetermined range from the cycle of one pulse detected previously,
The abnormality detection device for a water amount sensor according to claim 1, wherein the notification is performed. 3. The water supply pipe is for supplying water to a water heater, and the water heater is configured to supply one second pulse of a second predetermined number of the pulse signals output from the pulse signal output means. average period of generating hot water by heating water supplied from the water supply pipe when it becomes less than a predetermined value, the abnormality notification means, one pulse of the pulse signal having a period longer than the predetermined value 3. The abnormality detection device for a water amount sensor according to claim 1, wherein an abnormality notification is performed when a third predetermined number or more is detected within a predetermined time. 4. An impeller provided in a water supply pipe, rotated by flowing water passing through the water supply pipe, and provided with a plurality of magnetic poles at intervals in a rotational direction, and each of the magnetic poles when the impeller rotates. A device for detecting an abnormality of a water amount sensor comprising: a magnetic detecting means provided so as to be opposed to the above; and a pulse signal output means for outputting one pulse signal every time the magnet is detected by the magnetic detecting means. The period of the pulse signal is detected for each pulse, and the detected period of the one pulse changes from the period of the one pulse previously detected by the number of magnetic poles beyond the one pulse beyond a predetermined range. An abnormality detecting device for a water quantity sensor, comprising: an abnormality notifying unit for notifying when a failure occurs. 5. An impeller provided in a water supply pipe for supplying water to a water heater and rotated by a water flow passing through the water supply pipe.
A pulse signal output means for outputting a pulse signal having a cycle corresponding to the rotation speed of the impeller, wherein the water heater is provided with a first predetermined pulse signal continuous When the average period of one part of the pulse becomes equal to or less than a predetermined value, water supplied from the water supply pipe is heated to generate hot water, and one of the pulse signals having a period longer than the predetermined value is generated.
An abnormality detection device for a water quantity sensor, comprising: abnormality notification means for performing abnormality notification when a second predetermined number or more pulses are detected within a predetermined time.