JP3292325B2 - Forced operation method of direct connection unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forcibly operating a directly connected unit for supplying water from a water supply main pipe to a supply destination building.

[0002]

2. Description of the Related Art First, a conventional direct connection unit will be described with reference to FIG.

In FIG. 6, a water supply main pipe L is connected to a suction pipe L1.
Is connected to the suction side of a pump 4 driven by an electric motor 3 via a check valve 1, and a suction pressure sensor 2
Is provided. The discharge side of the pump 4 is a pumping pipe L
2, the pipe is guided to the supply destination building 8 via the check valve 5, the pipe end is branched, and a plurality of taps 9 are provided.

A discharge pressure sensor 6 and a pressure tank 7 are provided in the middle of the pumping pipe L2, and a downstream side of the suction pressure sensor 2 of the suction pipe L1 and a downstream side of the check valve 5 of the pumping pipe L2. The side is bypassed by a bypass pipe L3 provided with a check valve 10. The suction pressure sensor 2, the discharge pressure sensor 6, and the electric motor 3 are connected to a control panel 11A, and a power supply 12 is connected to the control panel 11A.

In such a configuration, the control panel 11A
Performs control such that when the set value of the discharge pressure of the pump 4 is always lower than the suction side pressure, water is supplied to the supply destination building 8 via the bypass pipe L3 without operating the pump 4.

In the operation of the conventional direct connection unit, if the set value of the discharge pressure (hereinafter referred to as set pressure) is Pd and the suction pressure is Ps, the operation is determined by the relationship between these two pressures Pd and Ps.

[0007] That is, in the case of setting pressure> suction pressure Ps, when water is used in the building 8, the water in the pressure tank 7 is used first, and when the pressure in the tank 7 becomes equal to or lower than the setting pressure Pd. , The pump 4 is started, and the water supply main pipe L is connected to the suction pipe L1.
The water in the pump 4 is always replaced by the water in the water supply main pipe L because the water is sent to the water pumping pipe L2 via the pump 4 via the pump.

On the other hand, as described above, the set pressure Pd
In the direct connection unit set to ≦ suction pressure Ps, when water is used in the building 8, the water is sent from the water supply main pipe L to the pumping pipe L2 via the suction pipe L1 via the bypass pipe L3. The water in 4 always stagnates and the water supply main line L
There is a problem that it is not replaced with water.

[0009] JP-A-4-330127 and JP-A-1-138383 disclose a technique for automatically supplying water from a water distribution pipe or a water receiving tank to a terminal faucet. However, the former aims to save energy by suspending the electric pump when the source pressure is sufficient, and the latter opens the discharge port branched to the discharge side a predetermined time after the pump is stopped and stagnates. It releases water and does not solve the above problem.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of forcibly operating a directly connected unit capable of replacing stagnant water in a pump due to an insufficient number of operations (time).

[0011]

According to the present invention, a check valve is connected to a suction side of a pump from a water supply main line via a suction pipe, and a check valve is connected to a discharge side of the pump. A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe on the downstream side of the valve, and a bypass pipe is connected between the suction pipe and the pumping pipe. Is a device equipped with a check valve, and when the set value of the discharge pressure is always lower than the suction side pressure, it can be supplied to the supply destination building via the bypass pipe without operating the pump In the forced operation method of the direct connection unit,
The pump is forcibly operated when there is a flow in the pumping pipe when the number of times of operation of the pump per day / or the operation time is equal to or less than the set number of times / time.

Further, according to the present invention, the check valve is connected to the suction side of the pump from the water supply main line via the suction pipe, and the discharge side of the pump is connected to the downstream side of the check valve. A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe, and a bypass pipe is connected between the suction pipe and the pumping pipe. If the set value of the discharge pressure is always lower than the suction side pressure and the pump is not operated, the device directly attached to the supply destination building can be supplied via the bypass pipe when the valve is installed. In the operation method, when the number of times of operation / day of the pump is equal to or less than the set number of times / time, the discharge pressure is measured based on a signal from the discharge pressure sensor, and the discharge pressure immediately before the operation is set to a predetermined value. (For example, 0.5kgf / c ²⁾ adding to the calculated pressure setting during operation, then, it is characterized by operating the pump and the set value as the discharge pressure.

According to the present invention, the water supply main pipe is connected to the suction side of the pump via the suction pipe, and the discharge side of the pump is connected to the check valve. A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe, and a bypass pipe is connected between the suction pipe and the pumping pipe. If the set value of the discharge pressure is always lower than the suction side pressure and the pump is not operated, the device directly attached to the supply destination building can be supplied via the bypass pipe when the valve is installed. In the operation method, when the number of times of operation of the pump per day / or the operation time is equal to or less than the set number of times / time, the set value of the discharge pressure is set to a pressure higher than the suction side pressure, and the pump is operated. The specified number of times and / or operation time It is characterized in that return to the set value of the original discharge pressure Once beyond.

[0014]

According to the present invention, the number of times of operation of the pump per day /
Or, determine whether the operation time is equal to or less than the set number of times and / or set time, and when there is a flow in the pumping pipe, that is, when there is water usage, forcibly operate the pump to reduce the stagnant water in the pump. The water can be discharged and replaced with fresh water from a water supply main pipe (claim 1).

Further, it is determined whether or not the number of times of operation / day of the pump is equal to or less than the set number of times / time, and the discharge pressure is measured based on a signal from the discharge pressure sensor.
A predetermined value, for example, 0.5 kgf / c,
By calculating the set pressure during operation by adding m ² and operating the pump using the value as the discharge pressure, the discharge water of the pump is sent to the pressure tank even when water is not used at the supply destination. The stagnant water in the pump can be replaced with fresh water from the water supply main line (claim 2).

[0016] Then, it is determined whether or not the number of daily operations / or the operating time of the pump is equal to or less than the set number / or the set time.
The pump is operated with the set value of the discharge pressure set to a pressure higher than the suction side pressure to discharge the stagnant water in the pump (if water is not used, it is sent to the pressure tank). Replace with fresh water from When the number of times of operation / or the operation time exceeds the specified value, the discharge pressure is returned to the original set value (claim 3).

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a direct connection unit for implementing the present invention. A flow switch 13 is interposed downstream of the discharge pressure sensor 6 of the pumping pipe L2 of the direct connection unit, and the flow switch 13 is connected to the conventional direct connection shown in FIG. It has the same configuration as the unit.

The control panel 11 is provided with a timer (not shown). When the pump 4 is a variable speed pump, the operating pressure is lower than the pressure immediately before the pump 4 is operated by a predetermined pressure (for example, 0.5 kgf / cm ² ).

Next, the mode of control will be described with reference to FIG.

The control panel 11 determines whether or not the pump 4 is stopped based on the operation state of the electric motor 3 (step S1). If YES, the stop time is measured by the timer (step S2). If NO, the stop time of the timer is reset (step S3), and the process proceeds to step S4. In step S4, it is determined whether or not the measured stop time, that is, the number of times of operation per day is equal to or longer than the set time, that is, the set number of times of operation. In the case of NO, the control ends, and in the case of YES, it is determined whether or not the flow switch 13 is ON, that is, whether or not there is a flow in the pumping pipe L2 (step S5). If no, wait
If YES, that is, if water is used in the building 8, the discharge pressure is measured based on the signal from the discharge pressure sensor 6 (step S6), and the discharge pressure immediately before the operation is set to a predetermined value (0. After adding 5 kgf / cm ² ) to calculate the set value of the pressure during operation (step S7), the electric motor 3 is operated, the pump 4 is operated (step S8), and the control is terminated.

That is, when the number of times of operation of the pump 4 is the number of times of operation set per day, the pump 4 needs to be forcibly operated. However, even if the pump 4 is operated when the amount of used water is zero, water does not flow on the discharge side, so that the operation state of the pump 4 is in the cut-off state, so that the water in the pump 4 is not replaced. Therefore, the pump 4 is operated by detecting that there is an amount of water to be used.
The water inside can be replaced to prevent stagnant water.

FIG. 3 shows another embodiment of the present invention.

In steps S11 to S14, the control panel performs the same processing as in steps S1 to S4, and then operates the pump 4 for a predetermined time (step S15).
Therefore, the number of operations is counted (step S16), and it is determined whether or not the number of operations has reached a specified value (step S16).
17). If NO, the process returns to step S11, and YES
Then end the control.

In the above control, the pressure during the operation of the pump 4 is set higher by a predetermined pressure P (for example, 0.5 kgf / cm ² ) than immediately before the operation of the pump 4, similarly to the above-described control mode.

In FIG. 4, the amount of water retained inside the pressure tank 7 before starting corresponds to the lower part a. On the other hand, when the predetermined pressure P is increased as described above, the internal water amount corresponds to the lower part b, and the difference between them is the effective water amount Vt of the pressure tank 7.

That is, by operating the pump 4, even if the building 8 is not using water, water corresponding to the minimum effective water amount Vt flows out of the pump 4.

When the volume inside the pump 4 is Vp, and the specified value N is expressed by N = Vp / Vt by comparing the volume Vp with the effective water amount Vt, the operation of the pump 4 is repeated by the specified value or more. Of water can be replaced.

When the pump 4 is a fixed speed pump, the pump 4 is operated at a fixed speed for a fixed time, or
Is performed at a pressure higher than that immediately before the operation of the pump 4 (for example, 0.5 kgf / cm ² ).

Next, another embodiment of the present invention will be described mainly with reference to the flowchart of FIG.

When the discharge set pressure Pd> the suction pressure Ps, when water is consumed at the water supply destination, the water in the pressure tank 7 is used first, and when the pressure in the tank 7 becomes equal to or lower than the discharge set pressure Pd, the pump is operated. 4 starts. Then, new water is sucked into the pump 4 from the water supply main pipe L via the suction pipe L1,
The water in the pump 4 is constantly replaced with fresh water in the water supply main pipe L because the water is sent to the pumping pipe L2 through the pump.

On the other hand, when the discharge set pressure Pd ≦ the suction pressure Ps, the pump 4 is not operated because a pressure equal to or higher than the set pressure Pd always exists on the discharge side. The water in the water supply main pipe L passes through the bypass pipe L3 via the suction pipe L1, and is sent to the pumping pipe L2. If this state continues for a predetermined time or longer, the state is detected and the control described below is performed.

When it is determined whether or not the above state (discharge set pressure Pd ≦ suction pressure Ps and the pump 4 is stopped) has continued for a predetermined time or more, it is first determined whether or not the pump 4 has stopped. (Step S21). If stopped (step S21 is YES), the stop time is measured by a timer (not shown) (step S22). If not stopped (step S21 is NO), the timer not shown is reset (step S21). Step S23).

Next, in step S24, the stop time is compared with the set time (predetermined time). If the stop time has not reached the set time (step S24 is NO), the control routine is stopped once and the above-mentioned operation is performed again. S21 to S24 are restarted.

On the other hand, if the set time has elapsed (YES in step S24), the discharge set pressure Pd is set as in the following equation (step S25).

If the suction set pressure Pd = suction pressure Ps + α is set as in the above equation, the suction set pressure becomes higher than the suction pressure, and the pump is started. This state corresponds to the case where the discharge set pressure Pd> the suction pressure Ps described above.
That is, the water in the pressure tank 7 is used first, and when the pressure becomes equal to or lower than the set discharge pressure Pd, the pump 4 starts, and new water is sucked into the pump 4 from the water supply main pipe L via the suction pipe L1 to pump water. Water is sent to the pipe L2, and the water in the pump 4 is constantly replaced with fresh water in the water supply main pipe L.

The number of operations or the operation time in such a state is counted in step S26, and step S2
At 7, a comparison is made with a predetermined number of operation times or operation time (specified value). If the value is equal to or less than the specified value (step S
27 is NO), the above-described steps S25 to S27 are repeated.

If the number of operations or the operation time exceeds the set value (YES in step S27), the discharge set pressure Pd changed by the above equation is returned to the original value (step S28), and the control routine ends. I do.

[0039]

As described above, according to the present invention, the following effects can be obtained. (A) When the set discharge pressure is lower than the suction side pressure, the pump is not operated and can be supplied to the supply destination via the bypass pipe. Operation, the stagnant water in the pump generated due to infrequent operation is discharged and replaced with fresh water from the water supply main pipe (claim 1). (B) Even when water is not used at the supply destination, the pump is operated with the set value obtained by adding a predetermined value to the discharge pressure immediately before the operation as the discharge pressure, so that the stagnant water in the pump is supplied to the water supply source. It can be replaced with fresh water from a tube (claim 2). (C) Further, by setting the discharge pressure of the pump to be higher than the suction side pressure and operating for a specified time, the stagnant water generated due to infrequent operation is discharged and replaced with fresh water from the water supply main pipe. (Claim 3). (D) Each replacement method of the stagnant water can be performed without discharging water from the discharge side to the outside.

[0040]

[0041]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram illustrating an example of a direct connection unit that implements the present invention.

FIG. 2 is a control flowchart of one embodiment of the present invention.

FIG. 3 is a control flowchart of another embodiment of the present invention.

FIG. 4 is a circuit diagram around a pressure tank for explaining the operation of this embodiment.

FIG. 5 is a control flowchart of still another embodiment of the present invention.

FIG. 6 is an overall configuration diagram showing an example of a conventional direct connection unit.

[Explanation of symbols]

 L: Water supply main pipe L1: Suction pipe L2: Pumping pipe L3: Bypass pipe 1 ... Check valve 2 ... Suction pressure sensor 3 ... Electric motor 4 ... Pump 5 , 10 ... check valve 6 ... discharge pressure sensor 7 ... pressure tank 8 ... supply destination building 9 ... faucet 11, 11A ... control panel 12 ... power supply 13 ... Flow switch

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E03B 1/00 E03B 11/16 E03B 11/12 E03B 11/00 E03B 7/00-7/04 E03B 5 / 00-5/02

Claims (3)

(57) [Claims] 1. A check valve is connected to a suction side of a pump from a water supply main line via a suction pipe, and a check valve is connected to a discharge side of the pump. The check valve is connected to a pumping pipe downstream of the check valve. And
A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe, a bypass pipe is connected between the suction pipe and the pumping pipe, and a check valve is attached to the bypass pipe. If the set value of the discharge pressure is always lower than the suction side pressure, in the forced operation method of the direct connection unit that can supply the building to the supply destination via the bypass pipe without operating the pump, the pump A forced operation of the pump when there is a flow in the pumping pipe when the number of operations and / or the operating time is less than the set number of times and / or the set time. 2. A pump is connected from a main water supply pipe to a suction side of a pump via a suction pipe, and a check valve is connected to a discharge side of the pump, and is connected to a pumping pipe downstream of the check valve. And
A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe, a bypass pipe is connected between the suction pipe and the pumping pipe, and a check valve is attached to the bypass pipe. If the set value of the discharge pressure is always lower than the suction side pressure, in the forced operation method of the direct connection unit that can supply the building to the supply destination via the bypass pipe without operating the pump, the pump If the number of times of operation / or the operation time is equal to or less than the set number of times / or the set time, the discharge pressure is measured based on the signal from the discharge pressure sensor, and a predetermined value is added to the discharge pressure immediately before the operation to obtain the pressure during the operation. A forced operation method for a direct-coupled unit, comprising: calculating a set value of a direct connection unit, and thereafter operating the pump using the set value as a discharge pressure. 3. A pump is connected from a main water supply pipe to a suction side of a pump via a suction pipe, and a check valve is connected to a discharge side of the pump. The check valve is connected to a pumping pipe downstream of the check valve. And
A discharge pressure sensor and a discharge pressure tank are connected to the pumping pipe, a bypass pipe is connected between the suction pipe and the pumping pipe, and a check valve is attached to the bypass pipe. If the set value of the discharge pressure is always lower than the suction side pressure, in the forced operation method of the direct connection unit that can supply the building to the supply destination via the bypass pipe without operating the pump, the pump If the number of operations and / or the operation time is less than the set number of times and / or the set time, the pump is operated with the set value of the discharge pressure higher than the suction side pressure, and the number of operations and / or the operation time is the specified value. A method of forcibly operating a directly connected unit, wherein the setting value of the discharge pressure is returned to the original value when the pressure exceeds the limit.