JPH04330127A - Automatic water supply system - Google Patents

Abstract

PURPOSE:To provide a sanitary automatic water supply system by furnishing a main pressure sensor to a water supply pipe, judging with this sensor if the main pressure is below a specified value, and thereupon stopping the operation of or controlling the drive of a pump for a group of terminal water supply taps. CONSTITUTION:An automatic water supply system comprises a group 3 of terminal water supply taps, a water supply pipe 4, a motor-driven pump MP, a main pressure sensor PS1, a discharge pressure sensor PA2, a controlling means 12, and a driving means 13. The main pressure is sensed by the sensor PS2, and the result is fed to a judging device 8 of the control means 12 which judges whether the pressure is over the specified value. If over, it is possible to supply water to terminal water supply tap STV while the pressure is kept at the main pressure, and the pump MP is put in standstill. If under the specified value, variable voltage is supplied to the pump MP by the driving means 13 through the control means 12 to put the pump into operation. This eliminates necessity for providing any water receiving tank, and a sanitary automatic water supply system can be accomplished.

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 pipe to a terminal faucet.

0002

[Prior art] For example, the water in a water distribution pipe is under the original pressure (hydrostatic pressure)
The goal is to be able to supply water to the end faucet of a two-story building using this source pressure, but for mid-to-high-rise buildings of three or more stories, the source pressure It seems that there may be cases where there is insufficient water to supply water to the end hydrant. Therefore, water from the distribution pipes is first put into a water tank, and then pumped up from this water tank to an elevated water tank installed on the roof of the building, and from this elevated water tank, water is supplied by gravity to the terminal water taps on each floor. are doing. Alternatively, the water once placed in the water tank was directly supplied to the end faucet using a pressure pump.

0003

[Problem to be solved by the invention] However, in such conventional water supply systems, in order to supply water to the terminal hydrants of mid-to-high-rise buildings, water from the distribution pipes has to be first introduced into the water receiving layer. Therefore, the source pressure applied to the water pipes is cut off even when the pressure is sufficient to flow into the terminal faucet, and therefore the energy of the source pressure is not used, which is an issue in the age of energy conservation. There was a problem in that it went against the request.

[0004] Furthermore, once water is stored in a water tank, the activity of the water is lost, so water tanks with an effective volume exceeding 20 cubic meters are subject to the Simple Water Supply Act, and safety and health management is mandatory. . However, in recent years, it has become difficult to maintain the above management due to rising installation costs due to soaring land prices, labor shortages, and rising personnel costs. Furthermore, in the case of small-scale water tanks that are not subject to the above-mentioned regulations, safety and health management tends to be insufficient, which poses safety and health problems.

[0005] The present invention utilizes the energy of the source pressure when the source pressure of the water distribution pipe is sufficient, and also eliminates the need to install a water tank, thereby reducing the maintenance cost of this automatic water supply system. The purpose is to provide an automatic water supply system that is free from health and safety issues.

[0006]

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a water supply pipe that supplies water from a water pipe to an end hydrant, and a water supply pipe that is interposed in the middle of this water supply pipe. at least one electric pump that discharges water to the terminal water tap; a source pressure sensor that is installed in a water supply pipe upstream of the electric pump and detects the source pressure of the water source; and a water supply pipe downstream of the electric pump. a discharge pressure sensor for detecting discharge pressure; and a discharge pressure sensor for 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 certain pressure or less to operate the electric pump. The electric pump is configured to include a control means that outputs a signal, and a drive means that specifies and supplies variable electric power to the electric pump based on the signal from the control means.

[0007]

[Operation] When the source pressure is detected by the source pressure, the control means determines whether or not this source pressure is above a predetermined value, and if it is above the predetermined value, the source pressure is sufficient and this energy can be used to flow into the end faucet. Therefore, the electric pump will be stopped. When it is determined that the original pressure is less than or equal to a predetermined value, variable power is supplied to the electric pump by the driving means, and the electric pump to be operated at this time is specified.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings. 1 to 3 are diagrams showing an embodiment of an automatic water supply system according to the present invention.

In FIG. 1, reference numeral 1 indicates a water source to which original pressure (hydrostatic pressure) is applied, and a water pipe 2 is connected to this water source 1, and from this water pipe 2, each floor of a mid-to-high-rise building 3 is connected. Water supply pipe 4 for supplying water to the provided end hydrant STV
is branching out.

[0010] The water supply pipe 4 includes electric pumps MP1, MP2...
MPn is provided, and these electric pumps MP1, MP2...M
A water absorption side collecting pipe 5 is attached to the water absorption side of Pn, and a 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 by a bypass pipe 7, and the bypass pipe 7 and the water intake side collecting pipe 5 are provided with check valves CHV0, CHV1, CHV2...CHVn. The water supply pipe 4 on the upstream side of the water intake side collecting pipe 5 is equipped with a source pressure sensor PS1 that detects the source pressure of the water distribution pipe 2 and a double check valve DC.
HV is installed. Additionally, there is a flow rate switch FS that detects whether water is flowing in the water supply pipe 4 downstream of the discharge side collecting pipe 6 (whether the end water supply tap STV is being used).
, a discharge pressure sensor PS2 that detects the pressure of water discharged by the electric pumps MP1, MP2, . . . MPn, and a pressure tank T that reduces pressure fluctuations of the water.

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 determiner 8, and are determined by the determiner 8. Depending on the conditions, a drive signal is output to the operating number controller 9, and a signal of the discharge pressure is input to the PI controller 10. In the PI controller 10, the electric pump MP1
, MP2...MPn are operated at a constant discharge pressure by proportionally and integrally controlling the deviation signal between the set target value PdC and the discharge pressure Pd detected by the discharge pressure sensor PS2. Here, the determiner 8 and the PI controller 10 are the control means 1
2.

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 specifies the order of the electric pumps MP1, MP2, . Electric pump MP1,
MP2...MPn is VVV to keep the discharge pressure constant.
It is operated at variable speed by V/F converted power supplied from the F inverter 11. Here, 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 explained based on FIG. 1 while referring to the flowchart shown in FIG.

When the source pressure is detected by the source pressure sensor PS1, this source pressure is output as a signal to the determiner 8, and the determiner 8 determines whether the source pressure is equal to or higher than a predetermined pressure PSH (step S1). When the source pressure is equal to or higher than the predetermined pressure PSH, that is, when the source pressure is sufficient and this energy allows water to flow into the terminal hydrant STV, a signal is output from the determiner 8 to the operation number controller 9, and the electric pumps MP1, M
P2...MPn is maintained in a dormant state (step S2)
. When the source pressure is below the predetermined value PSH, it is impossible to flow to the terminal water supply valve STV, and the electric pumps MP1, MP2...MP
It is necessary to operate n, but this source pressure is the lowest pressure PSL
In the following cases (step S3), that is, in an abnormal situation such as the water source being depleted or a breakage accident occurring in the water distribution pipe 2 leading to the electric pumps MP1, MP2...MPn, the electric pumps MP1, MP2...MPn are activated. (step S2). Furthermore, the source pressure is the lowest pressure value PSL
Even if it is less than the predetermined pressure value PSH, the discharge pressure value Pd is the same value as the discharge pressure setting target value PdC, so if the deviation signal value with the discharge pressure sensor PS2 is 0 value, the end hydrant STV is not used at all. state, the all-electric pump MP1,
MP2, . . . MPn are stopped to prevent unnecessary operation (step S4).

Next, if you open even one terminal water tap STV,
Water is supplied from the pressure tank T, and the discharge pressure value Pd gradually decreases. When the discharge pressure decreases to the starting pressure set value PdS, which is set lower than the discharge pressure set target value PdC, the signal from the discharge pressure sensor PS2 is inputted to the operating number controller 9 via the determiner 8 (step S5). The operating number controller 9 specifies the order of first, next, and subsequent electric pumps MP1, MP2, . . . MPn (step S6).

The signal from the pressure sensor PS2 is converted into a deviation signal by the determiner 8, and is also input to the PI controller 10. P
The control signal (proportional and integral) of the I controller 10 is
It is input to the VF inverter 11 (step S7). VV
The VF inverter 11 supplies the V/F converted power to the specified electric pump (starter) specified by the operating number controller 9 (step S8).

[0017] The electric pump is supplied with V/F converted power,
It is operated at a variable speed to maintain the discharge pressure at the target value Pdc. As the number of terminal water taps STV in use increases, the original electric pump MP1 reaches the limit of its ability to maintain the discharge pressure target value and begins to decrease from this discharge pressure set target value. When the discharge pressure sensor PS2 determines that it is difficult to maintain the discharge pressure set target value (step S9), the next electric pump MP is adjusted based on the discharge pressure signal Pd.
Drive 2. Furthermore, the end hydrant STV used
When increases, the subsequent electric pumps MP3 to MPn are additionally operated. Electric pumps MP1, MP2...MP at this time
The relationship between the discharge pressure and the discharge amount of n is as shown in FIG. Next, when the number of terminal water taps STV starts to decrease, the sequence is reversed and the subsequent electric pumps are stopped one after another. The last remaining leading machine is stopped by the stop signal from the flow rate switch FS. Here, in the next cycle, the operating number controller 9 changes the order of the first, next, and subsequent electric pumps to equalize the load time of each electric pump. Furthermore, the pressure tank T also reduces water hammer due to pressure fluctuations when the discharge amount of the electric pump is suddenly closed.

[0018]

[Effects of the Invention] As explained above, according to the present invention, when the source pressure applied to the water pipe is sufficient, water can be directly poured into the end faucet. Therefore, it is possible to utilize energy possessed by sufficient source pressure, and it is possible to meet the demands of the times for energy saving.

[0019] Furthermore, since it is not necessary to install a water tank, there is no need for safety and health management or high labor costs for this purpose. Therefore, the maintenance cost of this automatic water supply system can be reduced, and it is also possible to improve safety and health. There is no problem.

[Brief explanation of the drawing]

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 the operating characteristics of the electric pump used in this automatic water supply system.

[Explanation of symbols]

2...Water 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 that supplies water from a water distribution pipe to a terminal faucet, at least one electric pump interposed in the middle of this water supply pipe and discharging water to the terminal faucet, and a water supply pipe that supplies water from a water distribution pipe to a terminal faucet; A source pressure sensor is installed in the water supply pipe on the side and detects the source pressure of the water source, and a discharge pressure sensor is installed in the water supply pipe downstream of the electric pump and detects the discharge pressure. control means for determining whether the pressure is within a range from above a predetermined pressure to below a predetermined pressure and whether the discharge pressure is below a certain pressure and outputting a signal to operate the electric pump; An automatic supply system characterized by comprising a drive means for specifying supply to an electric pump.