JPH06102909B2 - Automatic water supply system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water supply system for automatically supplying water from a water distribution pipe to a terminal water tap.

[0002]

2. Description of the Related Art For example, the water in a water pipe is a source pressure (hydrostatic pressure).
Since this causes pressure, we aim to be able to supply water to the terminal hydrant of a two-story building by this source pressure. It seems that it may not be possible to supply water to the terminal hydrant by itself. Therefore, once the water from the distribution pipe is put in the water receiving tank, pumping up from this water receiving tank to the elevated water tank installed on the roof of the building, and from this elevated water tank to the terminal water tap on each floor, water is supplied by natural flow. is doing. Alternatively, the water once put in the water receiving tank was directly supplied to the terminal water tap by a pressure pump.

[0003]

However, in such a conventional water supply system, in order to supply water to the terminal water faucet of a middle-high-rise building, water from the water distribution pipe is once put in the water receiving layer. Therefore, the source pressure applied to the water distribution pipe will be cut off even when the pressure is sufficient to flow into the terminal faucet, and therefore the energy of the source pressure will not be used, and in the age of energy saving There was a problem that it was against the request.

Further, once the water is stored in the water receiving tank, the activity of the water is lost, so that the water receiving tank having an effective volume of more than 20 cubic meters is subject to the regulation of the simplified water supply law, and the health and safety management is obligatory. . However, in recent years, it has become difficult to maintain the above management due to rising installation costs due to soaring land, labor shortages, and rising personnel costs. Furthermore, in the case of a small-scale water receiving tank that does not meet the above regulations, safety and health management is likely to be insufficient, which is a problem in terms of safety and health.

According to the present invention, when the source pressure of the water distribution pipe is sufficient, the energy of this source pressure is utilized, and the installation of a water receiving tank is not required, thereby reducing the maintenance cost of this automatic water supply system. The objective is to provide an automatic water supply system that has no problems in terms of health and safety.

[0006]

In order to achieve such an object, according to the present invention, a water supply pipe for supplying water from a water distribution pipe to an end water tap and an intermediate water supply pipe are provided. At least one electric pump that discharges water to the terminal water tap, a source pressure sensor that is arranged in a water supply pipe upstream of the electric pump and detects a source pressure of a water source, and a water supply pipe downstream of the electric pump. And a discharge pressure sensor for detecting the discharge pressure, and for operating the electric pump by determining whether the detected source pressure is within a range from a minimum pressure to a predetermined pressure and whether the discharge pressure is a constant pressure or less. The control means for outputting a signal and the drive means for designating and supplying variable electric power to the electric pump based on the signal from the control means are provided.

[0007]

When the source pressure is detected by the source pressure, the control means determines whether or not the source pressure is equal to or higher than a predetermined value. When the source pressure is higher than or equal to the predetermined value, the source pressure is sufficient and the energy can be poured into the terminal faucet. Therefore, the electric pump is stopped. When the original pressure is determined to be equal to or lower than the predetermined value, the drive means supplies the variable electric power to the electric pump, and the electric pump to be operated at this time is designated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 3 are views showing an embodiment of an automatic water supply system according to the present invention.

In FIG. 1, reference numeral 1 is a water source to which a main pressure (hydrostatic pressure) is applied. A water distribution pipe 2 is connected to this water source 1 and from this water distribution pipe 2 to each floor of a building 3 of middle and high rises. Water supply pipe 4 for supplying water to the provided end hydrant STV
Is branched.

The water supply pipe 4 has electric pumps MP1, MP2 ...
MPn is provided and this electric pump MP1, MP2 ... M
The water absorption side collecting pipe 5 is attached to the water absorption side of Pn, and the discharge side collecting pipe 6 is attached to the discharge side. The water intake side collecting pipe 5 and the discharge side collecting pipe 6 are communicated with each other by a bypass pipe 7, and check valves CHV0, CHV1, CHV2 ... CHVn are arranged in the bypass pipe 7 and the water absorbing side collecting pipe 5. A source pressure sensor PS1 for detecting the source pressure of the water distribution pipe 2 and a double check valve DC are provided in the water supply pipe 4 upstream of the water intake side collecting pipe 5.
HV is provided. Further, a flow rate switch F for detecting whether water is flowing in the water supply pipe 4 on the downstream side of the discharge side collecting pipe 6 (whether the terminal water supply tap STV is used).
S, a discharge pressure sensor PS2 for detecting the pressure of water discharged by the electric pumps MP1, MP2, ... MPn, and a pressure tank T for reducing the pressure fluctuation of water are arranged.

The source pressure detected by the source pressure sensor PS1, the flow rate detected by the flow rate switch FS, and the discharge pressure detected by the discharge pressure sensor PS2 are input as signals to the determination unit 8 and determined by the determination unit 8. Depending on the conditions, a drive signal is output to the operating unit number controller 9 and the discharge pressure signal is input to the PI controller 10. In the PI controller 10, the electric pump MP
1, MP2 ... MPn are operated at a constant discharge pressure,
The deviation signal between the set target value PdC and the discharge pressure Pd detected by the discharge pressure sensor PS2 is proportionally and integrally controlled. Here, the determiner 8 and the PI controller 10 constitute the control means 12.

Based on the signal output from the PI controller 10, the VVVF inverter 11 supplies V / F converted power to the operating number controller 9. The operating number controller 9 drives the electric pumps MP1, MP2 ... MPn by designating the order of starting, starting, and succeeding. Electric pump MP1,
MP2 ... MPn are VVV in order to keep the discharge pressure constant.
It is operated at a variable speed by the V / F converted electric power supplied from the F inverter 11. Here, the VVVF inverter 1
1 and the operating number controller 9 constitute a driving means 13.

Next, the operation of this automatic water supply system will be described based on FIG. 1 with reference to the flow chart shown in FIG.

When the original pressure is detected by the original pressure sensor PS1, this original pressure is output as a signal to the judging device 8, and this judging device 8 judges whether the original pressure is equal to or higher than a predetermined pressure P _S H (step S ₁ ). If the original pressure is equal to or greater than the predetermined pressure P _S H,
That is, when the source pressure is sufficient and this energy enables pouring into the end water tap STV, a signal is output from the determination unit 8 to the operating unit number controller 9 to cause the electric pumps MP1 and MP1 to operate.
2 ... MPn is held in a resting state (step S ₂ ).
When the source pressure is equal to or lower than the predetermined value P _S H, it is impossible to pour into the end water tap STV and the electric pumps MP1, MP2 ... MP
It is necessary to operate n, but this source pressure is the minimum pressure P _S L
When: (Step S _3), namely the electric pump MP1 when the abnormal state such as a water source is depleted have or or electric pump MP1, MP2 ... damage accident in the water pipe 2 leading to MPn or cause, MP2 ... of MPn The operation is stopped (step S ₂ ). Moreover source pressure be less than the minimum pressure value P _S L or more predetermined pressure value P _S H, since the discharge pressure value Pd is the discharge pressure set target value PdC the same value, the deviation signal value of the discharge pressure sensor PS ₂ 0 value If this is the case, the end water tap STV is not being used at all, so all electric pumps MP ₁ , M
P _2, ... MPn is allowed to rest in order not to unnecessary operation (step S _4).

Next, when even one of the terminal hydrants STV is opened,
Water is supplied from the pressure tank T, and the discharge pressure value Pd gradually decreases. When the starting pressure set value PdS set to be lower than the target discharge pressure setting value PdC is decreased, the signal of the discharge pressure sensor PS ₂ is input to the operating unit number controller 9 via the determining device 8 (step S ₅ ). The number of operating units controller 9 electric pump MP1, MP2, ... starting to MPn, following onset, specifies the order of the subsequent onset (Step S _6).

The signal of the pressure sensor PS ₂ becomes a deviation signal at the judging device 8 and is also inputted to the PI controller 10. P
The control signal (proportional and integral) of the I controller 10 is set to VV.
Input to the VF inverter 11 (step S _7). VV
The VF inverter 11 supplies the V / F converted power to the designated electric pump (starter) that designates the operating unit number controller 9 (step S ₈ ).

The electric pump is supplied with V / F conversion power,
Operation is performed at a variable speed in order to maintain the discharge pressure setting target value Pdc. When the used end water tap STV increases, the starting electric pump MP1 reaches the limit of the discharge pressure target value maintaining ability and starts to decrease from the discharge pressure set target value. When the sustain discharge pressure set target value is determined to be difficult due to the discharge pressure sensor PS2 (Step S _9), to operate the electric pump MP2 follows onset in the same manner on the basis of a signal Pd of the discharge pressure. In addition, the terminal tap S used
When the TV increases, the subsequent electric pumps MP3 to MPn are additionally operated. Electric pumps MP1, MP2 ...
The relationship between the discharge amount of MPn and the discharge pressure is as shown in FIG. Next, when the number of the end taps STV starts to decrease, the reverse order is followed, and the electric pumps of the succeeding ones are sequentially stopped. The last remaining starter is stopped by the stop signal of the flow rate switch FS. Here, the operating number controller 9
At the time of the next cycle, the order of the first, second, and subsequent electric pumps is switched to equalize the load time of each electric pump. It should be noted that the pressure tank T also reduces water hammer due to pressure fluctuations when the discharge amount of the electric pump is rapidly closed.

[0018]

As described above, according to the present invention, when the source pressure applied to the water distribution pipe is sufficient, it is possible to pour the water into the terminal water tap as it is. Therefore, it is possible to use energy having a sufficient source pressure, and it is possible to meet the demand of the age of energy saving.

Further, since it is not necessary to install a water receiving tank, safety and health management and high labor costs for this are not required. Therefore, the maintenance cost of this automatic water supply system can be reduced and the safety and health can be improved. There is no problem.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of an automatic water supply system according to the present invention.

FIG. 2 is a flowchart showing the operation of this automatic water supply system.

FIG. 3 is a graph showing operating characteristics of an electric pump used in this automatic water supply system.

[Explanation of symbols]

2 ... Water distribution pipe, 4 ... Water supply pipe, 8 ... Judgment device, 9 ... Operation number controller, 10 ... PI controller, 11 ... VVVF inverter, PS1 ... Source pressure sensor, PS2 ... Discharge pressure sensor, M
P1, MP2 ... MPn ... Electric pump.

Claims (1)

[Claims] 1. A water supply pipe for supplying water from a water supply pipe to an end water tap, at least one electric pump interposed in the middle of the water supply pipe to discharge water to the end water tap, and an upstream of the electric pump. Source pressure sensor for detecting the source pressure of the water source, which is installed in the side water supply pipe, a discharge pressure sensor for detecting the discharge pressure provided in the water supply pipe downstream of the electric pump, and the detected source pressure is the lowest. A control unit that outputs a signal to operate the electric pump by determining whether the discharge pressure is within a range from a pressure or more to a predetermined pressure or less and a discharge pressure is a certain pressure or less; and a variable electric power based on a signal from the control unit. An automatic supply system comprising: a drive unit that supplies the electric pump by designating it.