JPH1182317A - Operation control device for water feed and distribution pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a remarkable energy saving by minimizing a power consumption when a small amount of water supply and distribution is required for consumers at higher levels and when a large amount of water supply and distribution is required for consumers at lower levels while an entire equipment is reduced in sized for economization. SOLUTION: An operation control device of a water supply and distribution pump is structured so that it judges the consumers who, at present, require supply and distribution of water and necessary water amounts based on a flow rates detected by a flow detectors 1F-3, 2F-3,..., 51F-3 which detect the flow rates in water supply and distribution branch pipes 1F-2, 2F-2,..., 51F-2 installed at multiple consumers with a height differences such as multistory buildings and, according to the judgment, performs the operation control in which the control of the number of operating pumps among a plurality of pumps 4A to 4D having a required water amount and lift at rating, selective switchover of the operation mode between the series and parallel operations of each pump, and operating rotational speed control of each pump are combined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where tap water or the like is supplied and distributed to each floor from the lowest floor (first floor or basement) to the highest floor of a high-rise building such as a high-rise building, or along a slope of a mountain. The present invention relates to an operation control device for a water supply / distribution pump used for distributing irrigation water to terraced fields existing in a wide range from a high place to a low place.

[0002]

2. Description of the Related Art Conventionally, there are two types of facilities for supplying and distributing water to a wide range of high and low level demand destinations from high places to low places, for example, from the lowest floor to the highest floor of a high-rise building. Water distribution facilities are known. One of them is to install a water supply tank at a high place such as the roof of a high-rise building, and when the water level in the water supply tank falls below a certain level at a low place such as the first floor or basement of a high-rise building. And a make-up water pump to be operated.

[0003] The other is to install a plurality of pumps having a head and a water amount capable of supplying and distributing water to a rated highest demand destination at a low place such as the first floor or the basement of a high-rise building. The number of operating the plurality of pumps is controlled in accordance with the required water amount.

[0004]

However, among the above-mentioned conventional water supply and distribution facilities, the former requires installation of a very large and heavy water supply tank at a high place such as the roof of a high-rise building. It is not desirable from the viewpoint of maintaining the strength of the building or the mountain slope itself and occupying space, and the maximum capacity with a head and water volume that can supply and distribute water to the highest level of demand as a makeup water pump Must be installed, and the entire equipment tends to be uneconomical. In addition, with the water level in the water tank below a certain level,
For example, even when supplying a small amount of water to a demand place at a low place, there is a problem that unnecessary power is consumed because the makeup water pump having the above-mentioned head and water quantity is operated at rated operation.

[0005] In the case of the latter, although only the amount of water can be changed stepwise by controlling the number of operating pumps, all of the plurality of pumps can supply water to the rated and highest-level demand destination. Since it has a possible head and quantity of water, it is necessary to supply a small amount of water to high-level customers or to supply a small or large amount of water to low-level customers. However, since the high-lift pump as described above is operated, excessive power is consumed, and there is a problem that an increase in running cost cannot be avoided.

[0006] The present invention has been made in view of the above-mentioned circumstances, and is intended to reduce the size and cost of the entire facility while requiring a small amount of water supply and distribution to high-level customers and low-level customers. Alternatively, it is an object of the present invention to provide an operation control device of a water supply / distribution pump capable of achieving significant energy saving by minimizing power consumption when a large amount of water supply / distribution is required.

[0007]

In order to achieve the above object, an operation control device for a water supply / distribution pump according to the first aspect of the present invention supplies power to a wide range of high and low level demand destinations from high places to low places. A flow rate detecting device is provided in each of the water supply and distribution branch mains branched and connected so as to distribute the water distribution, and a plurality of water supply units having a rated required water amount and a head are provided at the lower end side of the common water supply and distribution mains. Pumps are arranged, and the plurality of pumps are connected downstream of a connecting pipe connecting the discharge-side pipe of one pump and the suction-side pipe of the other pump, and the connecting pipe and a connecting point of the connecting pipe. An open / close valve interposed in each of the discharge-side pipe and the suction-side pipe of the other pump, and the one pump and the other pump are operated in parallel and in series by switching the open / close of these open / close valves. Off to the state Rotation speed control means for varying the operating rotation speed of the plurality of pumps is provided, and the required demand and supply destinations of the water supply and distribution are determined based on the flow rates detected by the respective flow rate detection devices. Determine the amount of water, and in accordance with the determination,
It is characterized in that the selection of the parallel operation state and the control of the operating speed of the pump are performed simultaneously in parallel.

According to the first aspect of the present invention having the above-described structure, the flow rates in the water supply / distribution branch main pipes provided at the high and low level demand destinations are respectively detected by the flow rate detecting device, and the respective detections are performed. Based on the flow rate, the demand destination and the required amount of water that currently require water supply and distribution are determined. According to the determination of the necessary demand and the required water amount of such water supply and distribution, for example, when a small amount of water is required for the high-level demand destination, one pump and another pump are switched to the serial operation state. The operating speed of these pumps is reduced to the required head and water volume through the speed control means, and if a large amount of water is required for low-level demand, a plurality of pumps must be installed. In parallel with switching to the parallel operation state, the number of operating pumps is controlled in series / parallel with the control of the number of operating pumps, for example, by controlling the number of operating pumps so that the required head and the required amount of water per pump are obtained via the number of rotation control means. By simultaneously selecting the operation state switching and controlling the operation speed of the pump, compared to the above-mentioned conventional operation number control system, a wide range of high and low levels can be achieved with less power consumption. It is possible to supply water distribution the necessary amount of water to the required destination.

In the operation control device for a water supply / distribution pump according to the first aspect of the present invention, the plurality of pumps can be selectively switched between a parallel operation state and a series operation state. When a plurality of pumps are combined into a single set and the plurality of pumps are configured, the operation control of the pump corresponding to the determination of the required demand and the required amount of water supply and distribution based on the detected flow rate of each floor can be performed more finely, and the power consumption can be reduced. Can be further increased.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a case in which an operation control device for a water supply / distribution pump according to the present invention is applied to an operation control device for a water supply / distribution pump in a high-rise building. In FIG. This common water supply and distribution main has a length ranging from the lowest floor of the high-rise building to the 51st floor, which is the highest floor, and is installed in a vertical position in a duct space (not shown). At a location corresponding to each floor 1F to 51F of the pipe 1, a water supply / distribution branch main pipe 1F-2, 2F- for distributing water supply / distribution to a demand destination of each floor.
, 51F-2 are branched and connected.

[0011] Water supply and distribution branch mains 1F-2 and 2F on each floor
−2,..., 51F-2 each have a flow detector 1F-
, 51F-3 are provided. In the machine room constructed on the basement floor or the first floor of a high-rise building at the lower end side of the common water supply / distribution main pipe 1, a plurality of units each having a required water amount and a head at a rated (highest efficiency point), for example, 4 units The pumps 4A, 4B, 4C, and 4D are provided. These four pumps 4A to 4D are configured such that a pair of adjacent pumps 4A and 4B and 4C and 4D are set as a set, and their operating states can be switched and selected for each set.

Specifically, as shown in FIG. 2, the suction side pipes 5A to 5D of the pumps 4A to 4D are connected to the water supply pipe 7, respectively, and the discharge side pipes 6A to 6D are connected to the common water supply and distribution. Each of the pumps 4A, 4C of each pair is connected to the base end of the main pipe 1 and is connected to the discharge side pipe 6 of one of the pumps 4A, 4C.
Connection pipes 8-1 and 8-2 are provided for connecting A, 6C and the suction-side pipes 5B, 5D of the other pumps 4B, 4D of each set. The discharge-side pipes 6B, 6D of the discharge pumps 6A, 6C of one of the pumps 4A, 4C of the set are downstream from the connection point of the connecting pipes 8-1, 8-2, and the pumps 4B, 4D of the other pumps 4B, 4D of each set. Each of the motorized on-off valves V11, V41 and V12, V42
V13 and V43 are interposed. Further, electric open / close valves V10, V20, V30 and V40 are also interposed in the suction side pipes 5A to 5D of the pumps 4A to 4D, respectively.

[0013] The electric on-off valve V
A valve opening / closing control device 10 for switching the opening and closing of 11, V41 and V12, V42 and V13, V43 is provided. By the operation of the valve opening / closing control device 10, as shown in FIG. The pumps 4A and 4B and the pumps 4C and 4D are operated in parallel and, as shown in FIG. 2B, can be selectively operated in series.
In FIG. 2, the valve painted black is closed, the valve outlined is open, and the arrows indicate the flow of water.

The motors 9A to 9D for driving the four pumps 4A to 4D are provided with a pump operation number control device 11 for controlling the operation and stop of the pumps 4A to 4D.
And a rotation speed control device 12 that makes the rotation speed of each of the pumps 4A to 4D variable. Further, in FIG.
Reference numeral 3 denotes a controller. The controller 13 receives the detected flow rate signals from the respective flow rate detecting devices 1F-3, 2F-3,..., 51F, and compares the input detected flow rate signals on each floor. By doing so, the necessary floor and the required water amount of the supply and distribution water are determined, and the pump operation number control device 11, the valve opening / closing control device 1
It is configured to output a command signal to each of the zero and the rotation speed control device 12.

Next, a description will be given of a pump operation control operation by the operation control device of the water supply / distribution pump in the high-rise building configured as described above. Each floor of high-rise building 1F-5
Water supply and distribution branch mains 1F-2, 2F-2,
..., the flow rate in 51F-2 is the flow rate detection device 1F-
3, 2F-3, ..., 51F-3,
The respective detected flow rate signals are transmitted to the controller 13 and are compared with each other to determine the floor requiring the current water supply and the required water amount. A command signal is output from the controller 13 to the pump operation number control device 11, the valve opening / closing control device 10, and the rotation speed control device 12 in accordance with the determination of the necessary floor and the required water amount of the water supply and distribution.

For example, when it is determined that a small amount of water is required to be supplied to the upper floor, a set of pumps 4A and 4B (or 4C and 4D) is operated via the pump operation number controller 11, and the valves are opened and closed. The electric on-off valve V via the control device 10
10, V11 and V13 open, V20 and V12 closed and both pumps 4
A and 4B are switched to the series operation state shown in FIG. 2B, and the pumps 4A and 4B are
The operating speed of B is reduced to the required head and water amount. If a large amount of water is required on the lower floors,
Electric on-off valves V10 and V10 via the valve on-off control device 10
20, V12 and V13 open, V11 closed and both pumps 4A, 4
B is switched to the parallel operation state shown in FIG. 2A and the pumps 4A, 4B
Is controlled such that the required number of rotations is equal to the required head and the required amount of water per pump.

As described above, the plurality of pumps 4A to 4A to 4F are determined in accordance with the determination of the floor that currently requires water supply and the required amount of water.
4D operation number control and one set of pumps 4A and 4B
And the selection of switching between the series operation state and the parallel operation state of the pumps 4C and 4D and the control of the operating speed of each of the pumps 4A to 4D at the same time, in each case, the required water amount to the required floor with the minimum power. Water can be supplied and distributed, saving energy.

By the way, as shown in the above embodiment, 5
Specific examples of water supply and distribution in a one-story high-rise building will be given, and the energy saving effect of each case will be described. (Case 1) A case where water supply and distribution of 50% of the rated water amount of one pump is required for the top floor (51F); % Rotation (N ₁₀₀ ). The required discharge pressure H, required water amount Q, and required power P at this time are as follows: H = H ₁₀₀ Q = 0.5 × Q ₁₀₀ P = P ₁₀₀ According to the present invention, two pumps are operated in series. At this time, the discharge pressure required to pump water to the top floor (H ₁ =
H ₂ ) and the number of revolutions N ′ are as follows: H ₁₀₀ = H ₁ + H ₂ H ₁ = H ₂ = (N ′ / N ₁₀₀ ) ² × HＮ (N ′ / N ₁₀₀ ) ² = 1 / 2´N ′ = N ₁₀₀ × ^{1/2 1/2} = 0.7 × N _{100 In} addition, the water amount Q ′ and the power P ′ per unit at this time.
Q ′ = 0.7 × Q… 70% of the rated water volume. P ′ = (0.7) ³ , so the total power PT is PT = P ′ ₁ + P ′ ₂ = 2p ′ = 2 × (0.7) ³ × P = 0.686P, and the conventional unit control 6 compared to one operation in the system
Only 8.6% power is required, and 31.4% energy savings can be achieved.

(Case 2) (1/1) of the top floor (51F)
0) When water supply and distribution of 200% of the rated water volume of one pump is required on the floor (approx. 5th floor) where the head can be lifted; The pump is rotated 100% (N ₁₀₀ ). The required power at this time is 2P. According to the present invention, two sets of two pumps are operated in parallel. At this time, the required water amount Q per pump, the required rotation speed N ', the head H' per pump, and the power P 'per pump are as follows: Q = 0.5 × Q × = 2 × Q × (1/4)｝ N ′ = 0.5 Q / Q = 0.5 H ′ = (0.5) ² × H ₁₀₀ = 0.25 × H ₁₀₀ > 0.1 × H ₁₀₀ P ′ = (0. 5) ³ × P = 0.125P, and thus the total power PT becomes PT = 4 × 0.125P = 0.5P, which is 6 times smaller than the operation of two units in the conventional number control method.
Only 8.6% power is required, and 31.4% energy savings can be achieved. <Discharge pressure required to pump water to the top floor (H ₁ =
H ₂ ) and the number of revolutions N ′ are as follows: H ₁₀₀ = H ₁ + H ₂ H ₁ = H ₂ = (N ′ / N ₁₀₀ ) ² × HＮ (N ′ / N ₁₀₀ ) ² = 1 / 2´N ′ = N ₁₀₀ × ^{1/2 1/2} = 0.7 × N _{100 In} addition, the water amount Q ′ and the power P ′ per unit at this time.
Q ′ = 0.7 × Q… 70% of the rated water volume. P ′ = (0.7) ³ , so the total power PT is PT = P ′ ₁ + P ′ ₂ = 2p ′ = 2 × (0.7) ³ × P = 0.686P, and the conventional unit control Only 25% power is required and 75% energy savings can be achieved.

(Case 3) Water supply and distribution of 100% of the rated water volume of one pump is required on the middle floor; in this case, it is between Case 1 and Case 2 described above, and several tens% The above energy saving can be achieved.

In the above embodiment, the present invention is applied to the operation control of the water supply / distribution pump in a high-rise building, but other than this, for example, as schematically shown in FIG. .., NF existing along a wide range from high places to low places along the slope T, a common water supply / distribution main pipe 1 and each step field 1F of the common water supply / distribution main pipe 1 NF can be applied to the case where the irrigation water is distributed through the water supply / distribution branch main pipes 1F-2, 2F-2,... In FIG. 3, a plurality of pumps 4 (4A to 4D) installed at the lowest position of the slope use a river or a pond R as a water supply source, and other configurations are the same as those of the above-described embodiment. Since they are the same as those described above, description and illustration are omitted.

[0022]

As described above, according to the first aspect of the present invention, the demand which currently requires the water supply and distribution based on the detected flow rate in the water supply and distribution branch mains provided at the high and low level demand destinations. The operation is controlled by combining the control of the number of pumps operated, the selection of switching between serial and parallel operation, and the control of the operating speed of the pump in accordance with the judgment. Compared to a system with a heavy water supply tank and make-up water pump, it is possible to reduce the size and economy of the entire equipment, as well as when a small amount of water is required or supplied to a high-level demand destination. Even when a large or small amount of water supply and distribution is required at the level demand destination, predetermined water supply and distribution can be performed with minimum power, and there is an effect that a large energy saving can be achieved as a whole.

In particular, according to the second aspect of the present invention, the operation control of the pump can be performed more finely, the amount of power reduction can be increased, and the energy saving effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an outline of a case where the present invention is applied to an operation control device of a water supply / distribution pump in a high-rise building.

FIG. 2 is an enlarged view of a main part of the operation control device;
(A) is a figure which shows a parallel operation state, (b) is a figure which shows a series operation state.

FIG. 3 is a schematic side view showing another embodiment (application example) of the present invention.

[Explanation of symbols]

 1F2, 2F-2, ..., 51F-2 Water supply / distribution branch main pipe 1F-3, 2F-3, ..., 51F-3 Flow rate detection device 4A-4D Pump 5A-5D Suction side piping 6A-6D Discharge side piping 8- 1, 8-2 communication pipe 12 rotation speed control device (rotation speed control means) 13 controller V10 to V13, V20, V30, V40 to V43 Electric open / close valve

Claims (2)

[Claims] A flow detecting device is provided in each of water supply and distribution branch main pipes which are branched and connected so as to distribute water supply and distribution to a wide range of high and low level demand destinations from high places to low places. At the lower end side of the water supply and distribution mains, a plurality of pumps having a required amount of water and a required head are arranged, and the plurality of pumps are connected to a discharge-side pipe of one pump and a suction-side pipe of another pump. Connecting pipes, and an on-off valve interposed in each of the discharge-side pipe and the suction-side pipe of the other pump downstream of the connecting pipe and the connection point of the connecting pipe. The one pump and the other pump can be switched between a parallel operation state and a series operation state by switching on and off, and rotation speed control means for varying the operation rotation speed of the plurality of pumps is provided. Being Based on the flow rate detected by each of the flow rate detection devices, the required demand destination and the required water amount of the supply and distribution water are determined, and the number of pumps to be operated and the selection of the serial / parallel operation state and the operation speed of the pumps are determined according to the determination. An operation control device for a water supply / distribution pump, wherein control is performed in parallel with control. 2. The operation control of the water supply / discharge pump according to claim 1, wherein the plurality of pumps are a set of a plurality of pumps that can be selectively switched between a parallel operation state and a series operation state. apparatus.