JP4691519B2 - Increased pressure water supply system for medium to high-rise buildings - Google Patents

Description

  The present invention is a pressure booster that is directly connected to a water pipe for water supply and has a pressure booster pump arranged in the water pipe so as to supply and distribute moderately pressurized water to each floor of middle and high-rise buildings of 20 floors or more. It relates to the improvement of the water supply system.

  Conventionally, in the water supply of medium- and high-rise buildings, a water supply system that supplies water that has been boosted by a pump from a water receiving tank placed at a low position to a high-rise floor has become widespread. Excessive pressure may interfere with the use of faucets and appliances, and noise and water hammer may occur, causing wear on faucets and pressure reducing valves on lower floors, shortening the life of parts. There were drawbacks. Therefore, zoning systems in which water supply sections are divided into a plurality of systems and intermediate water tanks, high-rise water tanks, intermediate pressure increasing pumps, and the like are appropriately disposed in each system in middle- and high-rise buildings have become widespread.

On the other hand, the main water supply type water supply system, which is used as a booster pump by eliminating the water receiving tank and directly connecting the pump to the water pipe, saves energy and is especially noticed as an improvement in the building structure by eliminating the water receiving tank on the higher floors. Has been. The zoning method is also introduced to this main direct water supply system, and as disclosed in, for example, Japanese Patent No. 3318860 (Patent Document 1), each floor of a medium-high-rise building is sequentially divided into several floor groups from the lower side. The water supply to the floor belonging to the lower floor group is performed by the water pipe for the lower floor group directly connected to the water pipe, and the water supply to the floor belonging to the floor group other than the lower floor group is There is known a water supply system in which each floor group is provided by a water pipe for each higher floor group connected to the discharge side of a dedicated booster pump.
Patent No. 3301860

Furthermore, as disclosed in, for example, Japanese Patent No. 3302004 (Patent Document 2), when the zoning method is adopted for the main pipe direct water supply system, the suction side of the dedicated booster pump of each floor group is sequentially, Water is supplied by connecting to the water supply pipes on the lower floor group side of the floor group, and when the booster pump on the upper floor group side of the above booster pump starts operation, It is also known to perform operation control of each booster pump so that the booster pumps of the floor groups of the other floors start operating simultaneously.
Patent No. 3302004

  However, the water pressure in water pipes varies from region to region, and there are changes in water pressure throughout the day. Based on this current situation, it is necessary to provide stable water supply to the middle and high floors regardless of the region. On the other hand, in the pressure-increasing water supply system disclosed in Patent Documents 1 and 2, water is supplied only to the water pressure of the water pipe without using a pressure-intensifying pump in the lower floor group, so that depending on the area, the lower floor There is a risk that water may not be supplied to the floor group and the accompanying higher floor group.

  In addition, the current Japan Water Works Association standard specifies that the maximum operating pressure of the pressure increasing pump is 0.75 MPa. Further, the suction pressure drop when the pump is started is regulated to be 0.05 MPa or less within 25% of the pre-starting pressure. This pressure-increasing water supply system using the pressure-intensifying pump can be used only for middle-rise buildings up to the 15th floor. Recently, however, high-rise buildings with more than 20 stories have been increasing, and water supply pipes and booster pump units use more expensive materials and require high performance, which raises the construction and maintenance cost of medium- and high-rise buildings. The result is

Therefore, in the present invention, in the pressurized water supply system for middle and high-rise buildings that increases the water supply pressure from the water pipe and supplies water to each floor layer of the middle and high-rise building, it is directly connected to the water pipe via a backflow preventer and arranged in parallel. After combining the unit pressure tank provided on the discharge side of the two unit pumps and the bypass pipe parallel to the two unit pumps, it has a gate valve to increase the pressure of water supply from the water pipe and pressure, with a low floor for pressure increasing pump unit for supplying water to the lower floor layer, is directly connected to the discharge side of the floor for pressure increasing pump unit floor group lower than the floor, disposed in parallel After combining the unit pressure tank provided on the discharge side of the two unit internal pumps and the bypass pipe parallel to the two unit internal pumps, the gate has a gate valve and is located below the floor. Booster pump for floor of floor group The pressure of the feed water from the knit and pressure increase, the higher-order floor pressure increasing pump unit for supplying water to the intermediate floors up floor pressure pump unit and the high floor group to feed water to the intermediate floor group, the intermediate floor floor pressure increasing pump A pressure tank provided in communication with the suction side of each of the unit and the booster pump unit for higher floors, and a pressure tank for suppressing a decrease in the pressure in the pipe held by the booster pump unit on the upstream side of the feed water, The pressure on the suction side of the low floor booster pump unit is detected, and when the pressure is higher than the pressure set in advance in the low floor booster pump unit, the pressure in the lower floor booster pump unit is When the water in the bypass unit is supplied with water and the pumps in the two units are not operated and the pressure is lower than the pressure set in advance in the booster pump unit for the lower floor, the two units are set so as to have a preset target pressure. In the unit The water supply is performed by controlling the rotational speed of the pump, and for the intermediate floor booster pump unit or the higher floor booster pump unit, the floor booster of the floor group below the floor is concerned. When it is possible to continue water supply at the pressure held in the discharge side piping of the pump unit, the two in-unit pumps in the intermediate floor booster pump unit or the higher floor booster pump unit Does not start and water is supplied through the bypass pipe, and water supply cannot be continued with the pressure held in the discharge side pipe of the floor booster pump unit in the floor group below the floor. Is a floor below the floor so that the water pressure in the discharge side piping in the floor booster pump unit of the floor group below the floor becomes a preset target pressure. The two units of the booster pump unit for the floor of the group Provided is a pressurized water supply system for medium- and high-rise buildings, wherein water supply is performed by controlling the number of operation revolutions of a pump in the unit.

The total head of the building is determined by the sum of the water supply height, the pressure loss (pipe resistance) of the water supply pipe and water supply equipment, and the required pressure at the end. The terminal required pressure here is a required pressure at the terminal water tap on the uppermost floor. This required pressure was 0.147 MPa (1.5 kgf / cm ² ) in the conventional request, but in recent years water supply equipment that requires operating pressure at the end of the faucet, such as automatic dishwashers and tankless toilets, has increased. , 0.196 MPa (2.0 kgf / cm ² ) indentation pressure is required.

According to the water supply association standard, it is stipulated that the lowering of the suction pressure of the intermediate floor group booster pump is 0.05 MPa or less at the start of the pump. When the operation is started, it is necessary to maintain the suction side pressure of the booster pump at least 0.098 MPa (1.0 kgf / cm ² ) or more. In addition, in order to set the required pressure at the end of the top floor to an indentation pressure of 0.196 MPa (2.0 kgf / cm ² ), the middle floor group booster pump that has started operation of the booster pump of the lower floor group The discharge pressure is the pressure on the suction side of the booster pump in the upper floor group, and it is necessary to maintain the indentation pressure of 0.147 MPa (1.5 kgf / cm ² ) to 0.196 MPa (2.0 kgf / cm ² ). In this way, the suction side of the booster pump for the lower floor group is directly connected to the water pipe through the backflow preventer, and the discharge side of the booster pump for the lower floor group is boosted for the intermediate floor group In the pressurized water supply system for middle and high-rise buildings, which is directly connected to the suction side of the pump, and further, the discharge side of the booster pump for the intermediate floor group is directly connected to the suction side of the booster pump for the higher floor group, Each pressure pump independently detects the discharge side pressure of each booster pump and starts / stops, or controls the rotational speed of the pump so as to maintain the target pressure. The booster pump on the intermediate floor is controlled so that the indentation pressure is 0.196 MPa (2.0 kgf / cm ² ). In addition, when the middle floor group booster pump starts operation, the suction of the booster pump placed on the intermediate floor is suppressed in order to prevent the pressure in the piping held by the lower booster pump from decreasing. A pressure tank is provided on the side.

Since the present invention is configured as described above and performs operation control, it has the following operational effects as compared with the above-described conventional pressure-increasing water supply system for high-rise buildings.
(1) A common water supply system can be supplied even in areas where the water supply pressure of water pipes is different.
(2) Sufficient water supply can be economically arranged on the upper floors of high-rise buildings over 20 floors without using special facilities or equipment.
(3) Installation is possible at a lower cost than in the past, and an energy-saving control water supply system is constructed.
(4) Water supply on all floors is performed by the pressure-intensifying pump unit and the control device attached to it, and it is possible to control the integrated water supply system, contributing to system construction such as remote monitoring and automatic control.

  As an embodiment of the present invention described above, a booster pump unit I including a backflow preventer, a booster pump and a bypass pipe, a pressure tank, etc. is directly connected to a water main through the backflow preventer, and the booster pump A pressure increasing pump unit II including a pressure increasing pump, a bypass piping, a pressure tank, etc. is directly connected to the end of the discharge side water supply pipe of the unit 1, and the pressure increasing pump unit II is connected to the end of the discharge side water supply pipe of the pressure increasing pump unit II. The pressure-increasing pump units III, IV,... Having the same structure as the pressure pump unit II are sequentially connected in series, and each pump unit increases the suction-side pressure obtained by the suction-side pressure transmitter to a predetermined water supply pressure. A control unit that controls the operation of each booster pump is provided, and water is supplied at a predetermined pressure from the lower floor to the upper floor. Therefore, the pressure-intensifying pump unit directly connected to the water pipe can cover the amount of water that can supply the entire building, and is arranged on the first floor or the basement of the building.

  FIG. 1 shows a conceptual diagram of the present invention. The pressure-intensifying pump unit 1 directly connected to the water pipe 10 is in charge of water supply of the lower floor and mainly uses the suction pressure from the water pipe 10, so the degree of pressure increase is low, but it is directly connected to this unit 1 It shall cover the amount of water supply that can supply the entire building, and is arranged on the first floor or basement of the building. The booster pump unit 2 for the intermediate floor group is directly connected to the end of the discharge side water supply pipe of the booster pump unit 1. In order to suppress a decrease in the pressure in the pipe held by the booster pump unit 1, a pressure tank 4 having a predetermined capacity is provided on the suction side of the booster pump unit 2 arranged on the intermediate floor. Pressure tanks 5... Can also be provided on the suction side of the higher floor booster pump units 3.

  FIG. 2 shows a detailed mechanism of the pressure increasing pump unit 1 directly connected to the water pipe. The unit 1 includes a decompression type or double type backflow preventer 6 on the suction side from the water pipe 10. The booster pump unit 1 has two pumps P1 and P2 arranged in parallel, a pressure tank 7 on the discharge side of the pump, combined with a bypass pipe 8 parallel to the pump, and then connected through a gate valve 9 Directly connected to the suction side of the booster pump unit 2. In another embodiment, three pumps P1, P2, and P3 (not shown) may be arranged in the booster pump unit 1. Further, a pressure transmitter 11 is provided on the suction side of the booster pump unit 1 and a pressure transmitter 12 is provided on the discharge side, and the pressure value detected by each transmitter is received by the control device 13 to start / stop water supply in advance. The boost pumps P1 and P2 are controlled by operating and stopping the motors M1 and M2 via the inverter 14 as compared with the pressure set value, the rotation speed set value, the boost target value, and the like.

  FIG. 3 shows a mechanism of the pressure-increasing pump units 2, 3,... Directly connected to the discharge side of the pressure-intensifying pump unit 1 and sequentially supplying water at an optimum pressure to the water supply facilities in the middle and high floor groups. This configuration is basically the same as that of the booster pump unit 1 except that the backflow preventer 6 to the water pipe on the suction side of the booster pump unit 1 in the mechanism diagram shown in FIG. Further, as shown in FIG. 1, the pressure-intensifying pump unit 2.3... Is provided with a pressure tank 4 as shown in FIG. I have to.

  Next, pump operation control of each booster pump unit 1, 2, 3... Will be described. The suction side pressure transmitter 11 provided in the booster pump units 1, 2, 3... Always detects the pressure on the suction side of the booster pump, and water is used between the booster pump units 1 and 2. If the pressure is higher than the pressure set in advance in the booster pump unit 1 (pressure that can be supplied between the booster pump units 1 and 2), the bypass piping provided in the booster pump unit 1 Supply water at 8 and do not operate pumps P1 and P2.

  When the pressure on the suction side of the booster pump unit 1 detected by the suction side pressure transmitter 11 is equal to or lower than the pressure preset in the booster pump unit 1 (pressure that can be supplied between the booster pump units 1 and 2). Then, water supply is performed by controlling the operating rotational speeds of the pumps P1 and P2 so that the target pressure is set in advance (different from the pressure at which water can be supplied between the booster pump units 1 and 2).

  When water is used on the discharge side of the booster pump unit 2, if it is possible to continue water supply with the pressure held in the discharge side piping of the booster pump unit 1, the booster pump unit 2 is provided. Pumps P1 and P2 are not activated, and water is supplied only by bypass piping. When water supply cannot be continued with the pressure held in the discharge side piping of the booster pump unit 1, the suction side pressure transmitter 11 ′ provided in the booster pump unit 2 is always used for the booster pump unit 1. Water is supplied by detecting the water pressure in the discharge side pipe and controlling the number of revolutions of the pump so as to obtain a preset target pressure. Hereinafter, even when the booster pump units 3... Are installed, the same water supply control as that of the booster pump unit 2 is performed.

  By the way, in a model house with 230 units and 26 stories, the water supply unit with the conventional water supply system with a receiving tank and the water supply unit with the water main-intensifier pump series water supply system of the present invention was calculated and compared. From 28.5 million yen to 12 million yen, the running cost was 1.1 million yen / year including the water tank cleaning cost, but it turned out to be halved to 620,000 yen / year. As described above, in the pressure-increasing water supply system of the present invention, the installation cost is reduced by about 58%, the running cost is reduced by about 44%, and the equipment is thinned and the contract power is reduced for appropriate pressure control. This has the advantage of reducing equipment costs.

It is a conceptual diagram of the booster pump unit of this invention. The mechanism of the pressure increase pump unit 1 directly connected to a water pipe is shown. The mechanism of the booster pump units 2, 3,... Directly connected to the booster pump unit 1 is shown.

Explanation of symbols

1, 2, 3 Booster pump unit 4, 5 Pressure tank 6 Backflow preventer 7 Pressure tank 8 Bypass piping 9 Gate valve
10 Water pipe
11 Suction pressure transmitter
12 Discharge pressure transmitter
13 Control device
14 Inverter

Claims (4)

In the increased pressure water supply system for medium to high-rise buildings that increases the water supply pressure from the water pipe and supplies water to each floor of the middle and high-rise buildings,
The internal pressure tank provided on the discharge side of the two unit internal pumps directly connected to the water pipe via a backflow preventer and arranged in parallel with the bypass piping parallel to the two internal unit pumps were combined. A booster pump unit for lower floors, having a gate valve afterward, increasing the pressure of water supply from the water pipe, and supplying water to the lower floors;
The unit internal pressure tank and the two units provided on the discharge side of the two unit internal pumps connected in parallel and directly connected to the discharge side of the floor booster pump unit of the floor group below the floor After having combined with the bypass pipe parallel to the pump in the unit, the gate valve has a gate valve, and the pressure of the water supply from the floor booster pump unit of the floor group below the floor is increased, A booster pump unit for an intermediate floor for supplying water to a floor group and a booster pump unit for a higher floor for supplying water to a higher floor group;
Provided in communication with the suction side of each of the intermediate floor booster pump unit and the higher floor booster pump unit, and suppresses a decrease in the pressure in the pipe held by the booster pump unit upstream of the feed water. A pressure tank,
The pressure on the suction side of the low floor booster pump unit is detected, and when the pressure is higher than the pressure preset in the low floor booster pump unit, When the water is supplied through the bypass pipe and the two in-unit pumps are not operated, and the pressure is lower than the pressure set in advance in the low floor pressure increasing pump unit, the 2 Supply water by controlling the operating speed of the pump in the unit
For the intermediate floor booster pump unit or the higher floor booster pump unit, the pressure held by the discharge side piping of the floor booster pump unit of the floor group below the floor. When it is possible to continue water supply, the two in-unit pumps in the intermediate floor booster pump unit or the higher floor booster pump unit do not start and supply water through the bypass pipe, If the water supply cannot be continued with the pressure held by the discharge side piping of the floor pressure booster pump unit of the floor group below the floor, the floor group below the floor The two booster pump units for floors in the floor group below the floor so that the water pressure in the discharge side piping in the floor booster pump unit of the floor becomes a preset target pressure. Control the operating speed of the pump in the unit Pressure feed water system up for a mid-to-high-rise buildings and carrying out water. Each of the booster pump unit for the lower floor layer, the booster pump unit for the intermediate floor, and the booster pump unit for the higher floor,
A suction side pressure transmitter that detects and transmits the pressure on the suction side, and a discharge side pressure transmitter that detects and transmits the pressure on the discharge side;
The control apparatus which controls operation | movement of the said pump in two units based on the pressure value received from the said suction side pressure transmitter and the said discharge side pressure transmitter, The middle-high layer of Claim 1 characterized by the above-mentioned. Increased pressure water supply system for buildings. The controller is
A pressure value thus received, predetermined water supply start and stop pressure set value, compared to the boost target value, by driving and stopping the motor based on the comparison result, the operation of the two units in the pump The pressure-increasing water supply system for medium- and high-rise buildings according to claim 2, which is controlled. The controller is
When the pumps in each unit of the intermediate floor booster pump unit and the higher floor booster pump unit start operation, the suction side pressure of each unit pump is 0.098 MPa (1.0 kgf / cm ² ) or more. So that the discharge pressure of the pumps in each unit in the lower floor group is 0.147 MPa (1.5 kgf / cm ² ) to the suction side pressure of the pumps in each unit in the upper floor group. 4. The pressurized water supply system for medium and high-rise buildings according to claim 2 or 3, wherein control is performed to maintain an indentation pressure of 0.196 MPa (2.0 kgf / cm ² ).

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