JPS62121881A - Water supply apparatus - Google Patents

Abstract

PURPOSE:To reduce the impacting force functioning onto various points due to intermittent operation of a pump while to save the energy by additionally providing a control circuit for operating the pump continuously untill the flow will drop below a predetermined level if the intermittent operation of pump will exceed over a predetermined time. CONSTITUTION:A level 1 drive control means 12 for operating a pump 1 intermittently on the basis of an output signal S1 of the inner pressure of a supply pipe 5 from a pressure detecting means 6 is provided. While a level 2 drive control means 13 for never providing a stop signal S4 even upon exceeding of said output pressure signal S1 over a predetermined level but providing the stop signal S4 upon droppage of an output signal S2 of the flow in the supply tube 5 from a flow detecting means 7 below a predetermined level is provided. In the control of the pump 1 by means of the level 1 drive control means 12, it is shifted to the control through the level 2 drive control means 13 upon decision that the output frequency of the stop signal S4 has exceeded over a predetermined level through a decision means 14.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a water supply device having a water supply pump, and in particular detects the pressure and flow rate of a medium in a supply pipe on the discharge side of the pump to control whether the pump is on or off. Related to a water supply device that performs control <Prior art> Conventionally, the operation control of the pump in this type of water supply system has been limited to the supply of water to the equipment and equipment used on the discharge side of the pump. 1il, perform so-called on-off control by detecting pressure fluctuations in the medium in the pipe, driving the pump when the pressure is below a predetermined pressure, and stopping the rotation when the pressure is above a predetermined pressure. was common. Operation control according to such pressure changes has excellent advantages in terms of energy saving, but
When a large amount of water is consumed by the equipment used, the frequency of pump interruptions (number of interruptions per unit time) increases, which causes impact force to be applied to various parts of the pump, which can cause damage. was there.

However, in order to compensate for this drawback, a control method has been adopted in which the pump is forcibly kept in operation for a certain period of time once it has been turned on due to a pressure drop. Since then, there has been a drawback in that this goal has not been fully achieved.

Purpose of the present invention In view of the problems such as damage to the pump caused by the control method of the water supply device based on the above-mentioned conventional technology, it is an object of the present invention to solve By configuring the system to shift the pump, once turned on, to a control level that keeps it on intermittently for a certain period of time only when the frequency increases, the above drawbacks can be eliminated, and energy savings and pump performance can be achieved. It is an object of the present invention to provide an excellent water supply device that can satisfy the contradictory demands of reliability. Means outputs a high pressure condition signal, flow sensing means outputs a low flow condition signal in response to the flow rate of the medium in the supply pipe, and drive control means responds to the high pressure condition and low flow condition signal. In a water supply device that selectively supplies a drive signal or a stop signal to a switch means of a pump driving electric motor, the level state storage means stores a level I state or a level 2 state in response to a level 1 shift signal or a level 2 shift signal. and when the level I state is stored, the level 1 drive control means outputs a stop signal or a drive signal in response to the supply or disappearance of the high pressure state signal,
When the level 2 state is memorized, the level 2 drive control means outputs a stop signal in response to the simultaneous supply of the high pressure state signal and the low flow state signal, and also outputs a stop signal in response to the simultaneous supply of the high pressure state signal and the low flow state signal. In response, a drive signal is output, and on the other hand, the high-frequency state determining means determines, based on the drive signal or the stop signal, that the number of occurrences of the signal during a specific frequency determination period is equal to or greater than a specific value. and outputs a high-frequency status signal, and in response to the high-frequency status signal, the level 2 shift means shifts to level 2.
outputting a shift signal, and in response to the stop signal, the level 1 shift means outputs a level I shift signal, thereby:
In the level 1 state, the pump is intermittent in response to fluctuations in the medium pressure in the supply pipe, and when the frequency of intermittent interruption becomes high, it shifts to the level 2 state, and at this control level, the pump is once activated in response to the pressure drop The main idea is that the pump continues to operate intermittently even if the pressure increases, and its operation is only stopped when the pressure increases and the flow rate drops below a certain value. Further, in the above configuration, the level 1 shift means is configured to shift the level 1 shift means to the first and second level 1 shift means.
The level l shifting means $1 performs a first level l shifting in response to the first stop signal after the elapse of a specific driving state duration period starting at the time of supply of the driving signal. The second level 1 shift means outputs a second level 1 shift signal at the expiration of a specific stop state intermittent period starting at the time when the stop signal is supplied, and the second level 1 shift means is in the level 2 state. The gist of this is that the pump is shifted to the level I state only when the operating state of the pump continues for a certain period of time or more, or when the stopped state continues for a certain period of time or more.

<Example> Next, an example of the present invention will be described below based on the drawings.

FIG. 1 is a blow diagram simultaneously showing the hardware configuration and software function implementation means, in which an electric motor 2 for driving a pump 1 is connected to a power source 4 via a switch means 3, On the other hand, in the supply pipe 5, a pressure detection means 6 and a flow rate detection means 7 are attached. 8 is a pressure adjustment tank.

10 represents a drive control means, and the drive control means 10 includes:
In response to the high pressure state signal S1 from the pressure detection means 6 and the low flow state signal S2 from the flow rate detection means 7, a drive signal S3 or a stop signal S4 is selectively supplied to the switch means 3. The function realizing means stores the level 1 state in response to the level 1 shift signal S5,
A level state storage means 11 stores the level 2 state in response to the level 2 shift signal S6, and when the level state storage means 11 stores the level 1 state, it stops upon receiving the high pressure state signal S1. Level l drive control means 1 that outputs the signal S4 and outputs the drive signal S3 when it disappears.
2, when the level state storage means 11 stores the level 2 state, it receives the high pressure state signal St and the low flow state signal S2 simultaneously and outputs the stop signal S4, and outputs the high pressure state signal A level 2 drive control means 13 outputs a drive signal S3 when Sl disappears, and a high-frequency status signal S7 determines that the number of occurrences of the drive signal S3 or stop signal S4 during a specific period is equal to or greater than a specific value. A high-frequency state discriminating means 14 that outputs a high-frequency state signal S7, which is subsequent to the high-frequency state outputting means 14, receives a high-frequency state signal S7, and outputs a level 2 shift signal S8 to the level state storage means 11 that follows the high-frequency state signal S7.
a level 2 shift means 15 for outputting a level 1 shift signal S5, and a level 1 shift means following the level 2 drive control means 13 and outputting a level 1 shift signal S5 to the level state storage means 11 following the stop signal S4. It consists of 16.

The drive signal S3 or stop signal S4 from the level 1 drive means 12 and level 2 drive means 13 is supplied to the switch means 3.

The level I state regarding the operational control state of the pump 1 in the above configuration refers to a state in which the operational control of the pump 1 is controlled by the level of medium pressure in the supply pipe 5.
The pump 1 is driven when the pressure is below a certain level, and the operation of the pump 1 is stopped when the pressure is above a certain level. on the other hand,
The level 2 state refers to a state in which the operation of the pump 1 is controlled by the medium pressure in the supply pipe 5 and the flow rate; the pump 1 is driven when the pressure is below a certain level, and when the pressure is above a certain level. The pump 1 continues to operate even when the pump 1 is in use, and stops operating when the flow rate falls below a certain level. The transition from level 1 to level 2 is performed when the intermittent operation frequency of the pump 1 in the level 1 state within a specific period exceeds a certain frequency.

The operation of the above M configuration will be described below with reference to FIG. 2 showing a flow chart of the drive control means 10 and FIG. 3 showing a control time chart.

The drive control means 10 that has started (Fig. 2g) determines whether the pressure of the medium in the supply pipe 5 detected by the pressure detection means 6 is higher than a constant pressure (Fig. 2b), and the determination result is When is YES, that is, when the system is in a high pressure state, it is determined whether the operating state stored in the level state storage means 11 is at level 1 (FIG. 2c), and the result of the determination is YES. , if it is in the level 1 state, go off course and determine whether the pump 1 is in operation (Fig. 2 d); if YES, determine whether it is in the level 2 state or not (Fig. 2 e) ), in this case, the determination result is NO, so the contents of the stop count counter CTOI are incremented by 1 (FIG. 2 f).

Here, referring to FIG. 3, (A) shows a time chart of the on/off control of the pump 1, and the on/off control is performed within a specific frequency determination period T1 of the timer TM01 shown in (B). When the number of occurrences of the off signal reaches a specific value, which is three times in the illustrated example, the level 1 shifts to the level 2.

That is, returning to FIG. 2, it is determined whether the count at the counter CTOI has reached a specific value, for example, 3 times or more (FIG. 2 g), and when the determination result is YES, the control level is set to level l. Shift from level 2 to level 2 (Fig. 2 h), reset counter CTOl and timer TMOl (second
Figure i, D, stop signal S4 from level 1 drive control means 12
output and turn off pump 1 (Fig. 2k). After that, the second step determines whether or not to continue controlling the operation of the pump.
Figure 1), when stopping the operation control, stop the operation control (Figure 2 m), and when continuing, return to the process shown in Figure 2 (m) and repeat the subsequent steps.

During this time, when the timer TMOI times out (Fig. 2 n), an interrupt occurs and the timer TM old is reset (Fig. 2 0), the counter CTOl is reset (Fig. 2 p), and the main program is restarted. Return (Fig. 2 q).

However, in the above-mentioned off-course, if the judgment result in the step d in FIG.
If the count of the counter (:To 1) is less than or equal to a specific value as determined in the step of FIG. 2 q, the process skips to the step of FIG. 2 in both cases.

If the determination result in the step of FIG. 2C is NO, that is,
When the operation control state of the pump is at level 2, it is necessary to determine whether the flow rate detection result by the flow rate detection means 7 is in the low flow state (see Figure 2 r), and if the determination result is YES, the low flow state is established. At some point, the vehicle goes off course, passes through the process shown in Figure 2 d, and then enters the process shown in Figure 2 e. In this case, the determination result is YES, and the control level is shifted from level 2 to level 1. After FIG. 2 S), the process skips to the step shown in FIG. 2 j, and thereafter the same steps as described above are performed.

On the other hand, if the determination result in the step shown in Figure 2 is NO, that is,
When the medium pressure in the supply pipe 5 is in a low pressure state below a certain pressure, the system enters the on-course state and determines whether the pump 1 is off or not.
When the timer TMOI is stopped, it is determined whether the timer TMOI is on or not (FIG. 2 t), N.

When , set the timer TMOI (Figure 2 U).
, the pump 1 is turned on (Fig. 2 v), and if the determination as to whether the pump is stopped (Fig. 2 S) is NO, or the judgment as to whether the timer TMO1 is on (Fig. 2 If YES in t), skip to the step V in FIG. 2 and perform the subsequent steps.

Furthermore, when the flow rate determination result is NO (Fig. 2 r), that is, in the level 2 state, even if the pressure of the medium in the supply pipe 5 is in a high pressure state, the flow rate is in a large flow state. In some cases, the on-course process is carried out in a similar manner to the above (Fig. 2s).
-v) to continue operating the pump I.

Next, an embodiment of the second invention will be described below based on the drawings from FIG. 4 onwards.

In FIG. 4, first level 1 shift means 17 and second level 1 shift means 18 are provided in place of the level 1 shift means 16 in the first invention shown in FIG. said first and second level 1 shifting means 17.18
are both subsequent to the level 2 drive control means 13, and the first level I shifting means 17 determines the specific drive state ! which starts at the time of supply of the drive signal S3. ! In response to the first stop signal S4 after the elapse of the subsequent opening period, the subsequent level state storage means 1
1, a first level 1 shift signal S5° is output. Further, the second level 1 shift means 18 outputs the stop signal S4.
A second level 1 shift signal S5'' is output to the level state storage means 11 at the elapse of a specific stop state continuation period that starts at the time of supply of the signal.The other components are as follows. These components are the same as those indicated by the same reference numerals in FIG.

The operation of the above configuration will be described below with reference to FIG. 5 showing a flowchart of the drive control means 10 and FIG. 6 showing a control time chart.

The operation when shifting the operation control state of the pump 1 from level 1 to level 2 is the same as that of the first invention. Regarding the operation when shifting from level 2 to level 1, in the first invention, the pump 1 in the level 2 state
In contrast, in the second invention, the pump 1 is shifted to level 1 only at the first stop after the operation state of the pump 1 continues for a predetermined period in the level 2 state, or Alternatively, the pump 1 is shifted to level 1 when the operation of the pump 1 continues in the level 2 state for a predetermined period of time.

Referring to FIG. 6, when the pump is turned on in the level 2 state (FIG. 6 (A)), the first level 1 shift means 1
The on-timer TMO1 connected to 7 is set and starts timing operation (FIG. 6(B)), and after a specific drive state duration T2 has elapsed, a shift to level I occurs when the first stop signal S4 is generated. happens. Further, when the pump in the level 2 state is turned off (FIG. 6(C)), the off timer TMO2 connected to the second level 1 shift means 18 is activated.
Figure 6 (D)
), the shift to level 1 occurs when a specific stop state duration period T3 has elapsed.

That is, in FIG. 5, the control operation when the pump operation control is at level 1 and the shift operation from level 1 to level 2 are basically the same as in the case of FIG. After completing the process in Figure 5 j, it is determined whether the off timer TMO2 is on or not (Figure 5 A).
, when the judgment result is NO, the timer ↑[02 is set (Fig. 5B) and the pump is turned off (Fig. 5k). On the other hand, when the on-course is entered, the off-timer TM02 is set. After resetting (FIG. 5C), the step SV in FIG. 5 is performed.

On the other hand, when the pump is in level 2 state, if the medium pressure becomes high pressure state and low flow state, it will go off course.
After going through the steps d and e in FIG. 5, it is determined whether the flag register FLOI is "1" (5th AF). It's something that raises a flag. If the determination result (5th AF) is YES,
That is, if the timer TMO1 has already timed up, the control level should be shifted from level 2 to level 1.
5s), reset the flag register FLOI (5th AF), skip to the step in FIG. 5A, and judge whether or not 02 is on in the off timer (Fig. 5A); if NO, The timer TMO2 is set (FIG. 5AF) and the pump is turned off (FIG. 5k). When the timer τMO2 is on (FIG. 5A), the process skips to the step shown in FIG.

On the other hand, if the flag register FLOI is not "1" (5th AF), the process skips to the step of FIG. 5j and the subsequent steps are performed.

During this time, when the on-timer TMQ1 times up (5th AF), an interrupt occurs, and after resetting the timer TMO1 (0 in Figure 5), the flag register FLOI is set (1st AF), and the counter CTO1 is reset (Figure 55). p) After that, return to the main program (Fig. 5 q), and when the off timer TMO2 times out (Fig. 5 G), an interrupt occurs similarly and the control level is shifted from level 2 to level 1. )
, the timer TMO2 is reset (FIG. 5), and the program returns to the main program (FIG. 5J).

On the other hand, when it is not in a high pressure state (Fig. 5 b) or when it is in a level 2 state and not in a low flow state (Fig. 5 c, r), it enters the on course, but in this case, the off timer TMO
2 is reset (FIG. 5C), the process shown in FIG. 5 SV is performed. Further, the operations in other steps are the same as those indicated by the same reference numerals in FIG.

In the above-described embodiments of the first and second inventions, the frequency of intermittent operation of the pump in the level 1 state is counted based on the number of times the stop signal S4 is generated.

Of course, it is also possible to count the number of times the drive signal S3 is generated.

Other Embodiments> By the way, in the level 1 state in the embodiments of the first and second inventions, the operation control of the pump 1 is controlled by the level of the medium pressure in the supply pipe 5, and the Pump 1 starts operating when the pressure is below a certain level, and stops when the pressure rises above a certain level, and when the intermittent frequency exceeds a certain level. This is a transition to a level 2 state. however,
In the level 1 state, even though the intermittent operation of pump 1 is below a certain value, the intermittent operation still has some mechanical adverse effect on pump 1, so the intermittent operation should be reduced as much as possible. It is desired to gradually reduce the

Therefore, in the modified embodiment shown below, in the operation control in the level 1 state of the embodiments of the first and second inventions, a pressure detection means is provided as a configuration in which a timer TMO5 set by a low pressure state signal is attached. 6 detects a low pressure state of 7g and drives pump 1, it simultaneously sets timer TMO5 and forcibly continues pump 1's operation until a certain period of time set by timer TMO5 has elapsed. Even if the pressure detection means 6 detects a high pressure state during the process, the operation of the pump L is not stopped, and the frequency of intermittent operation of the pump in the level I state is gradually reduced. be. Further, when the flow rate detection means 7 detects a low flow rate state, that is, a state in which the amount of water consumed is decreased during the time measurement operation by the timer TMO5, the timer TMO5 is activated.
The operation of the pump 1 is stopped prior to the completion of timing of MO5.

The operation of this modified embodiment will be explained below with reference to the flowchart of FIG. 7 and the time chart of FIG. 8.

The drive control means 10 that has started (Fig. 7a) judges whether the pressure of the medium in the supply pipe 5 is equal to or higher than a preset constant pressure (Fig. 7b), and the judgment result is NO. When the low pressure state signal is output in a low pressure state (
Fig. 8 (A) a), according to the calculation flow, it is necessary to judge whether the pump l is in a stopped state or not (Fig. 7 S), and the judgment result is Y.
If it is ES and the pump is stopped, then
Determine whether or not timer TMO5 is ON (Fig. 7 w)
), the judgment result is NO and timer TMO5 is OFF.
When in the F state, set the timer ↑MO5 (X in Figure 7, (C) d) in Figure 8), then t in Figure 2, uc7.
) In the same way as the steps in Figure 7 t and u, the pump l
(V in FIG. 7, (D)g in FIG. 8). Also, if the determination result in the step W in FIG. 7 is YES, the timer TMQ5 is already in the ON state (timekeeping). in action)
If so, the process moves to the seventh step, and thereafter the same steps as described above are performed.

On the other hand, the judgment result in the process shown in Figure 7 is YI! And,
When a high pressure state signal is output due to detection of a high pressure state (Fig. 8 (A) b), it is determined whether or not the operation control is in a level I state (Fig. 7 C). is level l
Since the operation control is based on the state, the judgment result is Y.
ES, and then it is determined whether or not the timer TMO5 is in the ON state (Fig. 7y). When the result of this determination is NO, that is, when the timer TMO5 completes the timing of the set period T5 (Fig. Figure (C)e), the calculation flow goes off course by moving to the process shown in Figure 7 d, and the subsequent steps are from Figure 2 d to
In the process of FIG. 7 d-j, which is similar to the process of j, the timer TMO
5 (Fig. 7 z), and turn off the pump 1 (Fig. 7 k, Fig. 8 (D) h).

Further, the determination result of the step y in FIG. 7 is YES,
When the timer TMO5 is in the ON state and is in the timing operation, the process moves to the step shown in FIG. If NO and the state is in a large IJt amount state, the operation of the pump 1 cannot be stopped because it enters on-course according to the calculation flow and goes through the steps shown in FIG. 7 s-v in the same way as described above. On the other hand, if the determination result in the process of FIG. 7 r is YES and a low flow rate state signal is output (FIG. 8 (B) C), then in the calculation flow, After entering the off-course, the timer TMO5 should be reset via the process shown in Fig. 7 e-3 in the same way as described above. Fig. 7 2 and Fig. 8 (C
) f), turn off pump 1 (Fig. 7 2, 8
Figure (D) is D. Regarding other operations, please refer to the second
It is similar to that in the figure.

Furthermore, for convenience of explanation, the above modified embodiment has been explained as a modification of the operation control in the level 1 state in the embodiment of the first invention shown in FIG. [Level in Example] This is also directly applied to state operation control.

According to this modified embodiment, there is a practical benefit in that the mechanical load on each part of the pump can be further reduced during intermittent operation of the pump in the level 1 state.

Effects> As described above, according to the present invention, a drive signal or a stop signal is selectively supplied to the switch means of the pump drive motor in response to the pressure and flow rate of the medium in the supply pipe. In a water supply system that has a drive control means, there are two types: level 1 state, in which the pump is turned on and off in response to rises and falls in pressure, and one state in which it is turned on when the pressure drops and continues to operate even if the pressure rises, and when the flow rate decreases. By preparing a level 2 state in which the pump is first turned off at , when the consumption of the medium is relatively low, the pump is controlled on and off based only on the pressure fluctuation of the medium in the supply pipe to achieve energy saving, while on the other hand, when the consumption of the medium is high and the pump operation is interrupted When the frequency increases, once the pump is turned on, it continues to operate even if the pressure increases, and only when the consumption decreases and the flow rate becomes small, the pump stops, causing frequent intermittent operation. This has the excellent effect of being able to prevent damage to the pump caused by such problems.

According to the second aspect of the invention, the pump is turned off by the high pressure state signal and the low flow state signal after the level 2 operating state continues for a specific period or more. By doing this when shifting to level 1 after a short period of operation at level 2, it is possible to avoid the phenomenon in which the number of intermittent operations tends to increase again when shifting to level 1 after a short period of operation at level 2. By shifting to level 1 after a certain period of time has passed after the pump stops operating, it is possible to shift to level 1 after the water consumption has stabilized and decreased to a small amount, which contributes to preventing damage to the pump. It has an excellent effect of being large.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; Fig. 1 is a block diagram, Fig. 2 is a flowchart, Fig. 3 is a control time chart, and Fig. 4 and the following show an embodiment of the second invention. FIG. 4 is a block diagram, FIG. 5 is a flowchart, and FIG. 6 is a control time chart. Figure 7,
FIG. 8 shows a modified embodiment of the first and second inventions, FIG. 7 is a flowchart, and FIG. 8 is a time chart. ■・・・・・・・・・Pump 2・・・・・・・
...Electric motor 3...Switch means 5...
..... Supply pipe 6 ..... Pressure detection means 7 ..... Flow rate detection means 10 ....
... Drive control means 11 ... Level state storage means 12 ...
...Level 1 driving means 13...
Level 2 drive means 14...High frequency state discrimination means 15...Level 2 shift means 16
......Level 1 shift means 17...
...First level l shift means 18...
...Second level 1 shift means St...
High pressure status signal S2...Low flow rate status signal S3...Drive signal S4...Stop signal S5... ...Level l shift signal S8...
...Level 2 shift signal S7...
・High frequency status signal S5'...First level 1
Shift signal S5''... Second level 1 shift signal τ1... Frequency determination period T2... Drive state continuation period T3...
...Suspended state duration patent applicant Ebara Corporation Figure 3

Claims (2)

[Claims] (1) A pump 1 that pumps a medium into a supply pipe 5, an electric motor 2 that receives power and drives the pump, and that supplies power to the electric motor 2 in response to a drive signal S3 and in response to a stop signal S4. switch means 3 for stopping power supply to the electric motor 2; and a switch means 3 provided in the supply pipe for detecting that the pressure of the medium in the supply pipe 5 is equal to or higher than a preset reference pressure value, and detecting a high pressure state. A pressure detection means 6 that outputs a signal S1 is provided in the supply pipe 5, and detects that the flow rate of the medium in the supply pipe 5 is below a preset reference flow value, and outputs a low flow state signal S2. a drive control means 10 for selectively supplying a drive signal S3 or a stop signal S4 to the switch means 3 in response to the high pressure state signal S1 and the low flow state signal S2; In the water supply device, the drive control means 10 has a level 1
Level state storage means 11 stores the level 1 state in response to the shift signal S5 and stores the level 2 state in response to the level 2 shift signal S6; and the level state storage means 11 stores the level 1 state. level 1 drive control means 12, which outputs a stop signal S4 in response to the supply of the high pressure state signal S1, and outputs a drive signal S3 in response to disappearance of the high pressure state signal S1; When the level state storage means 11 stores the level 2 state, it outputs the stop signal S4 in response to the simultaneous supply of the high pressure state signal S1 and the low flow state signal S2, and outputs the high pressure state signal S1. level 2 drive control means 13 that outputs a drive signal S3 in response to disappearance of the drive signal S3, and the number of occurrences of the signals S3 and S4 during a specific frequency determination period T1 based on the drive signal S3 or the stop signal S4. High frequency state determining means 14 outputs a high frequency state signal S7 by determining that the level is equal to or higher than a specific value, and in response to the high frequency state signal S7, a level 2
Level 2 shift means 15 outputting a shift signal S6;
A water supply device comprising: level 1 shift means 16 for outputting a level 1 shift signal S5 in response to a stop signal S4. (2) A pump 1 that pumps a medium to the supply pipe 5, an electric motor 2 that receives power and drives the pump, and that supplies electric power to the electric motor 2 in response to a drive signal S3 and responds to a stop signal S4. switch means 3 for stopping power supply to the electric motor 2; and a switch means 3 provided in the supply pipe for detecting that the pressure of the medium in the supply pipe 5 is equal to or higher than a preset reference pressure value, and detecting a high pressure state. A pressure detection means 6 that outputs a signal S1 is provided in the supply pipe 5, and detects that the flow rate of the medium in the supply pipe 5 is below a preset reference flow value, and outputs a low flow state signal S2. a drive control means 10 for selectively supplying a drive signal S3 or a stop signal S4 to the switch means 3 in response to the high pressure state signal S1 and the low flow state signal S2; In the water supply device comprising:
Level state storage means 15 for storing the level 1 state and storing the level 2 state in response to the level 2 shift signal S6
When the level state storage means 15 stores the level 1 state, it outputs a stop signal S4 in response to the supply of the high pressure state signal S1, and in response to the disappearance of the high pressure state signal S1, When the level 1 drive control means 12 that outputs the drive signal S4 and the level state storage means 11 store the level 2 state, it responds to the simultaneous supply of the high pressure state signal S1 and the low flow state signal S2. level 2 drive control means 13 which outputs a stop signal S4 and outputs a drive signal S3 in response to disappearance of the high pressure state signal S1; The high-frequency state determining means 14 determines that the number of occurrences of the signals S3 and S4 during the period T1 is equal to or greater than a specific value and outputs the high-frequency state signal S7, and starts at the time of supply of the drive signal S3. a first level 1 shift means 17 for outputting a first level 1 shift signal S5' in response to a first stop signal S4 after the expiration of a specific drive state duration T2; and at the time of supply of the stop signal S4; The second level 1 shift signal S5'' starts at the elapse of the specific stop state duration period T3.
and second level 1 shift means 18 for outputting.