JP2000328613A - Feed water system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feed water system inexpensively and easily constructed by connecting a pumping feed water pipe having the function of pumping and feed water to the lower part of a high set water tank or a pressure water tank as a main piping system. SOLUTION: A feed water system is formed of a pumping feed water pipe 1 for connecting one end to the discharge port of a feed water pump 3 and connecting the other end to the lower part of a high set water tank 2, and a feed water branch pipe 8 branched from the feed water pipe 1. When a pump 3 is started, water is pumped from the feed water pipe 1 to the water tank 2, and when it reaches a stop water level 21, the pump 3 is stopped. Thereafter, when the faucet of a feed water consumption part is opened, water is fed through the feed water pipe 1 and the branch pipe 8 to the consumption part by gravity. When feed water consumption is advanced, the water level of the water tank 2 is lowered, when it reaches a water level 22, the pump 3 is started again, and water is supplied to the consumption part as soon as water is pumped to the water tank 2. Successively, when a consumption amount is smaller than a pumping amount, it reaches a water level 21, and the pump 3 is stopped. Thereby a cost can be remarkably lessened as compared with two pipe passages of pumping and feed water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply system from a water supply pump to a water supply branch pipe of a middle-high-rise building or the like.

[0002]

2. Description of the Related Art Conventionally, as a water supply system for a middle-to-high-rise building, (a) water is pumped from a water source by a water supply pump, the water is pumped and stored in an elevated water tank via a water pump, and a water pipe different from the water pipe. Gravity water supply system that supplies water to necessary places by gravity. (B) A pressure water supply system in which a pressure water tank is provided in the vicinity of the discharge port of the water supply pump, in which the amount of water that the motor of the water supply pump can maintain the minimum start interval within a safe range is stored by air, and water is supplied to a required portion by the pressure. . (C) There is a direct pumping water supply system that supplies water by controlling the number of operating water pumps and the number of rotations in accordance with the amount of water supply at a required location.

[0003]

This has the following disadvantages. (A) The gravity water supply system has two pipes for pumping and supplying water, which requires a reasonable piping cost and required space. (B) In addition, since there is an elevated water tank with a large amount of stored water at a high place, a large building structural strength is required, and the building is disadvantageous particularly against lateral stress during an earthquake. (C) In addition, an elevated water tank with a large amount of stored water at a high place is installed outside the roof of the tower, but measures against freezing and snow were required in cold regions.

(A) In the pressure water supply system, since the pressure water tank is located immediately near the discharge port of the water supply pump, the pressure held by the pressure water tank is the actual head from the pressure water tank to the highest water supply point and the frictional loss head of the fluid. And the required water pressure at the water supply point increased, and the pressure tank required large structural strength. (B) In Japan, pressure water tanks, which are subject to large pressures, became pressure vessels subject to the regulations of the Industrial Safety and Health Act, and were obliged to perform inspections based on laws and regulations and to prepare and store forms.

[0005] The direct pump water supply system requires a complicated control circuit and control parts for controlling the number of operation and the number of rotations of the water supply pump in accordance with the amount of water supply, resulting in enormous cost and complicated maintenance.

An object of the present invention is to provide a water supply system which solves the above-mentioned drawbacks.

[0007]

In order to achieve the above-mentioned object, in the water supply system of the present invention, a high water tank 1 or a pressure tank is used as a main piping system in a water supply pipe 1 having both functions of water pumping and water supply. Connected to the lower part of the water tank 4.

Further, the pumping water supply pipe 1 is branched into a water pumping pipe 11 and a water supply pipe 12 near the elevated water tank 2 or the pressure water tank 4, and the water pumping pipe 11 is connected to the upper part of the elevated water tank 1 or the pressure water tank 4 to supply water. The pipe 12 can be connected to the lower part of the elevated water tank 1 or the pressure water tank 4 via the pumping shutoff valve 7.

Alternatively, a pumping stop valve 7 is provided at a lower portion of the elevated water tank 2 or the pressure water tank 4, which is branched from the pumping water supply pipe 1 in the vicinity of the elevated water tank 2 or the pressure water tank 4, immediately below the stop water surface 21.
And the pumping water supply pipe 1 can be connected to the lower part of the elevated water tank 2 or the pressure water tank 4.

Further, the amount of water pumped by the water supply pump 3 is set to the maximum water consumption at the peak time, and the small water tank 2 or the pressure water tank 4 is so small that the electric motor of the water pump can keep the minimum starting interval within a safe range. Can also.

Further, the pressure water tank 4 can be provided as high as possible in the building to reduce the required pressure of the pressure water tank.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings based on embodiments. (A) In FIG. 1, a pumping water supply pipe made of, for example, vinyl chloride lining steel pipe, having one end connected to a discharge port of, for example, a spiral water supply pump 3 and the other end connected to a lower part of an elevated water tank 2 made of, for example, FRP. 1 and one or more water supply branch pipes 8 made of, for example, vinyl chloride lining steel pipes branched from the pumping water supply pipe 1. (B) When the water supply pump 3 is started, water is pumped from the water pumping water supply pipe 1 to the high water tank 2, and when the water surface reaches the stop water surface 21, the water supply pump 3 is stopped. (C) Thereafter, when the faucet or the like at the water supply consuming point is opened, water is supplied from the elevated water tank 2 to the water consuming point through the pumping water supply pipe 1 and the water supply branch pipe 8 by gravity. (D) As the consumption of water supply proceeds, the water level of the elevated water tank 2 drops, and when the water level reaches the activation water surface 22, the water supply pump 3 is activated again and water is pumped to the elevated water tank 2. If the faucet at the location is open, water will also be supplied there. (E) In this case, when the water consumption is larger than the water pumping amount of the water supply pump 3, the water is supplied more than the high water tank 2 at the same time. Although the water level drops, the water level of the elevated water tank 2 rises as soon as the water supply consumption becomes smaller than the pumping amount of the water supply pump 3, and when the water level reaches the stop water level 21, the water supply pump 3 is stopped. (F) For this purpose, the capacity of the high water tank 2, the pumping amount of the water supply pump 3, and the head calculated in the same manner as in the conventional technique are used. (G) Alternatively, the pumping amount of the water supply pump 3 is set to be the same as the maximum water consumption at the peak time, and the capacity of the high water tank 2 is reduced so that the starting interval of the motor for the water supply pump 3 is a minimum when the water consumption is small. The capacity can be made as small as possible to secure time. (H) When the capacity of the elevated water tank 2 is small, the elevated water tank 2 can be manufactured using, for example, a hard vinyl chloride tube. (I) Of the water supply branch pipes 8, the one closest to the elevated tank 2
It is also possible to take out the pumping water supply pipe 1 from a position near the connection part of the elevated water tank 2 and promptly replace the water in the elevated water tank 2 more quickly. (Nu) Further, the water level was adjusted to the stop water surface 21 and the start water surface 22,
For example, a relay interlocked with a water level sensor using a stainless steel electrode rod can be provided, and the signal can be used to automate the start and stop of the pump. (R) Further, as shown in FIG. 2, a plurality of pumping water supply pipes 1 may be provided. (ヲ) Also, as shown in FIG. 3, a plurality of high water tanks 2 can be provided. For example, a valve 5 using a gate valve can be opened and closed, and one of them can be used as a backup. (C) Alternatively, the sum of the capacities of the plurality of high water tanks 2 may be used in parallel as the required capacity, and one of them may be used only for the other, for example, for cleaning, so that the water is not imperfectly cut off. it can.

(A) In the embodiment shown in FIG. 4, two water supply pumps 3 are used. In this case, the capacity of the water supply pumps 3 is the same as that of a single water supply pump. Can back up each other. (B) Alternatively, the required pumping amount is divided by a plurality of water pumps 3, and when the water consumption is small, only one of the plurality of water pumps 3 is operated, and the water consumption is increased and only one is operated. If there is not enough water supply, another water supply pump 3
Can also be operated at the same time, as a single operation and a following operation. (C) When measuring the automatic start and automatic stop of the water supply pump 3 by the water level relay in the case of the single operation and the following operation, the start water surface 22 and the stop water surface 21 for the independent operation are determined, and the following water surface 24 for the following operation is determined. Is defined below the start water surface 22 and the following stop water surface 23 for the following operation is set below the stop water surface 21. When there are three water supply pumps 3, a third automatic operation water surface can be further defined below them. (D) Multiple feed pumps 3 for single operation and following operation
May be the same or different. (E) A plurality of feed pumps 3 are operated independently and in a following operation,
When the total water consumption of the water supply pump 3 is set to the maximum water consumption at the peak, the capacity of the high water tank 2 can be set to the capacity of the high water tank 2 for only one of the water supply pumps 3. It will be small. (F) Even in the case of the single operation and the following operation, backup can be performed with each other, so that the water can be prevented from being cut off even though the operation is incomplete.

(A) FIG. 5 shows an embodiment of the pipe connection of the elevated water tank 2, which branches near the elevated water tank 2 of the pumping water supply pipe 1 and is connected to the upper part of the elevated water tank 2. A pumping pipe 11 of the same material as that of the pumping water supply pipe 1 and a pumping stop valve 7 that closes when pumping water into the Kochi water tank 2 using, for example, a check valve, are connected. The water supply pipe 12 is connected to the lower part of the elevated water tank 2. (B) When the water supply pump 3 is operated and the water consumption is smaller than the pump water pumping amount, water flows into the high water tank 2 via the water pumping water supply pipe 1 and the water pumping pipe 11, but only when water is pumped into the Kochi water tank 2. There is no inflow of water from the water supply pipe 12 to the high water tank 2 by the closing valve 7 at the time of pumping to be closed. When the water level reaches the stop water level 21, the water supply pump 3 is stopped. (C) If the water consumption continues, water is supplied to the water consumption point via the pumping stop valve 7 which closes only when water is pumped from the water supply pipe 12 to the Kochi water tank 2, and the water is supplied to the Kochi water tank 2 and the water pump 1
The water surface of the water supply pump 1 will soon reach the start-up water surface 22 and the water supply pump 3 will be started. However, if the amount of water consumption is larger than the amount of water pumped by the water supply pump 3, all of the water pumped will be supplied to the water consumption point. The remaining water is supplied from the Kochi water tank 2 and the water level of the Kochi water tank 2 keeps lowering further. (D) Eventually, the flow of water from the water pump 11 into the Kochi water tank 2 in which the water consumption is smaller than the water pumping amount of the water pump 3 starts. (E) By repeating the above cycle, the water in the elevated water tank 2 is consumed from the lower part of the elevated water tank 2, while the supply of water to the elevated water tank 2 is performed from the upper part, and the water is constantly replaced. (F) Also in this case, of the water supply branch pipes 8, the one closest to the high water tank 2 is taken out from the water supply pump 3 side of the pumping water supply pipe 1 near the stop valve 7 at the time of pumping, and the water in the high water tank 2 is taken out. The replacement can be encouraged earlier.

(A) FIG. 6 also shows an embodiment in which the elevated water tank 2 is connected to a pipe. The valve branches off near the elevated water tank 2 of the pumping water supply pipe 1 and closes when the water is pumped into the elevated water tank 2. For example, an auxiliary water supply pipe 13 made of the same material as the pumped water supply pipe 1 connected to the upper part of the elevated water tank 2 via 7 is provided, and the pumped water supply pipe 1 is connected to the lower part of the Kochi water tank 2. (B) When the water supply pump 3 is operated and the water consumption is smaller than the pumping amount, the water flows into the high water tank 2 from the water supply pipe 1 and the water level of the high water tank 2 gradually rises. Water does not flow into the sub-water supply pipe 13 branched from the pipe 1 by the pumping-time closing valve 7 that is closed only when pumping water into the high water tank 2. (C) The water surface of the elevated water tank 2 that has risen soon becomes the auxiliary water pipe 13.
Reaches the connection part of the high water tank 2 and the water flows into the sub-water supply pipe 13 and fills, but the water level further rises and the pump stop water level 21
Is reached, the water supply pump 3 is stopped. (D) If water consumption continues, water is supplied from the pumping water pipe 1 to the water consumption point, and the Kochi water tank 2 and the auxiliary water pipe 1 are supplied.
The water surface of the water supply pump 3 will soon reach the starting water surface 22 and the water supply pump 3 will be activated. However, if the water consumption is larger than the water supply amount of the water supply pump 3, all of the water supply amount will be supplied to the water supply consumption point, and the water supply amount will be insufficient. The remaining water is supplied from the Kochi water tank 2 and the water level of the Kochi water tank 2 keeps lowering further. (E) Eventually, water starts to flow from the pumping water supply pipe 1 to the Kochi water tank 2 where the water consumption is smaller than the water pumping amount of the water supply pump 3. (F) Repeating the above cycle, the water in the elevated water tank 2
Immediately before the pump starts and stops, water flows into the sub water supply pipe 13 from the upper part of the high water tank 2 and is consumed, and the water is constantly replaced. (G) Also in this case, of the water supply branch pipes 8, the one closest to the elevated water tank 2 is taken out from a place near the connection part of the pumped water supply pipe 1 to the elevated water tank 2, and the water in the elevated water tank 2 is replaced. Can be encouraged earlier.

(A) Conventionally, it has been difficult to employ a gravity water supply system in a pressure water supply system. For example, when a high water tank cannot be installed at a sufficiently high place due to a building structure or form, or when a low-rise building is used over a wide area of a large site. In cases where the towers are dispersed and high water towers must be installed in order to set up elevated water tanks, such water towers will damage the landscape and the budget for water tower construction cannot be allocated It is adopted when it is done. (B) Therefore, in the present invention, the pressure water tank 4 is provided at a height that can be installed even under the above-mentioned conditions, and the pressure is set to have only insufficient water supply pressure at the installed height. . (C) The pressure in the pressure water tank 4 traps air in the upper part of the water tank,
The required pressure is obtained by utilizing the elasticity. The principle is that in the isothermal state of a certain amount of ideal gas, the product of pressure and volume is always constant, and pressure and volume are inversely proportional.
Sharl's law is used, considering air as an ideal gas. That is, if the absolute pressure is 1.033 Kgf / square cm and pressure is applied to 1,000 liters of air to make the absolute pressure 2.066 Kgf / square cm, the volume is 500
Liters. In other words, so that the air in the container does not flow out from the lower part of the 1,000 liter container in the atmosphere,
If 500 liters of water is injected, the water is incompressible, so the absolute pressure is 2.066 kgf / cm 2 on the top of the container.
500 liters of air and 2.06 absolute pressure below
It has 6 kgf / cm 2 of 500 liters of water, i.e. a gauge pressure of 1.033 kgf / cm 2 and an effective water volume of 5
It becomes a pressure water tank 4 of 00 liters. (D) FIG. 7 shows the vicinity of the pressure water tank 4 in which the elevated water tank 2 of FIGS. 1, 2 and 3 is replaced with a pressure water tank 4 made of, for example, a rigid PVC pipe. The pumping water supply pipe 1 and the water supply branch pipe 8 are the same as those shown in FIGS. (E) The distance between the start water surface 22 and the stop water surface 21 of the water supply pump 3 is determined so that the electric motor of the water supply pump 3 has a capacity enough to maintain the minimum start interval of the water supply pump within a safe range. Insufficient water supply pressure at the height where the pressure water tank 4 is installed is determined, and the pressure of the stop water surface 43 and the air volume above the stop water surface 43 are calculated by Boyle-Charard's law. (F) Since the pressure on the stop water surface 21 and the air volume above it are in inverse proportion, the higher the pressure, the smaller the air volume. In other words, if the pressure is increased, the overall capacity of the pressure water tank 4 becomes smaller than the effective water amount, but a structural strength that can withstand that pressure is required.
If it exceeds Kgf / square cm, it is subject to the regulations of the Industrial Safety and Health Law and may be subject to restrictions. Therefore, the pressure on the stop water surface 21 is reduced by taking these into consideration. (G) Of the water supply branch pipes 8, the one closest to the pressure water tank 4 can be taken out from the lower portion immediately adjacent to the stop water surface 21 to prompt the replacement of the water in the pressure water tank 4 earlier.

(A) Based on FIG. 7, the pressure of the starting water surface 22 is increased to a gauge pressure of 0.5 kgf / cm 2 (absolute pressure of 1.5 kgf).
33Kgf / square cm), the effective water volume is 450 liters, and the gauge pressure of the stop water surface 43 is 1.5 Kgf / square cm (absolute pressure 2.533 Kgf / square cm). The volume is 690 liters when calculated according to Boyle-Charle's law, and the volume above the starting water surface 22 is 1,140 liters which is 450 liters added to 690 liters. Furthermore, in order to obtain an upper volume of 1,140 liters of the starting water surface 22 having a gauge pressure of 0.5 kgf / cm 2 (absolute pressure 1.533 kgf / cm 2), the atmospheric pressure (absolute pressure 1.033 kgf / cm 2) is required. 692 liters of air with 0.5K gauge pressure
gf / square cm (absolute pressure 1.533Kgf / square cm)
It is obtained by applying pressure so that (B) Then, the atmospheric pressure water surface 41 is determined so that an air volume of 1,692 liters can be obtained at the upper portion thereof. For example, the atmospheric pressure water surface 41 is provided by opening the drain valve 9 using a ball valve. (C) The starting water surface 22 is determined so that a volume of 1,140 liters can be obtained at the upper part, and the stop water surface 21 is also determined such that a volume of 690 liters can be obtained at the upper part. An operating relay is provided, and a control circuit is provided so that the water supply pump 3 starts and stops at each water surface. (D) The intake / exhaust valve 6 such as a ball valve is provided above the stop water surface 21. (E) Opening the intake / exhaust valve 6 and manually operating the water supply pump 3 to fill the water supply piping system with water while discharging air from the intake / exhaust valve 6, and then opening the drain valve 9 to open the atmospheric pressure water surface. 41 is determined. (F) When the atmospheric pressure water level 41 is determined, the drain valve 9 and the intake / exhaust valve 6 are closed, and the water supply pump 3 is turned on and off by the control circuit so as to start and stop at the respective water levels. . (G) The water supply pump 3 starts operating, and automatically stops at the stop water surface 21. The pressure at that time is a gauge pressure of 1.5 kgf.
/ Square cm. (H) When the consumption of water supply continues, the water level in the pressure water tank 4 decreases and the pressure decreases at the same time. However, when the consumption of water supply reaches 450 liters, the starting water level 22 is reached, and the water supply pump 3 is started again. .5Kgf / square cm
It is. (I) In the case of the pressure water supply system, the capacity of the water supply pump 3 is previously set to be the same as the maximum water consumption at the peak, so that if the water consumption continues, the water is gradually stopped while the water is supplied to the water consumption point. The water level rises toward 21 and becomes the stop water level 21 soon, and the water supply pump 3 is automatically stopped. (V) This cycle is repeated to continuously supply water to the water consumption point. However, since the air in the pressure water tank 4 dissolves into the water little by little and the operating pressure decreases, the water level of the pressure water tank 4 is reset after the automatic operation for a certain period. I do. (L) As a drain valve 9 and an intake / exhaust valve 6, for example, an electromagnetic valve, a time switch is incorporated in a control circuit, and if normal operation is performed for a certain period of time, the water level of the pressure water tank 4 can be reset automatically to realize fully automatic operation. .

A pumping pipe 11, a pump-off shut-off valve 7 that closes when pumping water into the pressure water tank 4, and a water supply pipe 12 are also provided around the pressure water tank 4 as in FIG. You can also.

Alternatively, a pumping-time shut-off valve 7, which closes when the water is pumped into the pressure water tank 4, around the pressure water tank 4, as in FIG.
In addition, it is also possible to provide a sub-water supply pipe 13 and always replace the water in the pressure water tank 4.

Further, a plurality of pressure water tanks 4 may be provided as in the embodiment of FIG. 3, or a plurality of water supply pumps 3 may be provided as in the embodiment of FIG.

[0021]

Since the present invention is configured as described above, it has the following effects.

Since there is only one pumping water supply pipe, the cost is almost 67% of that of the conventional technology and the piping in the building, compared with the two pipes of the conventional water supply pipe and the water supply main pipe in the gravity water supply method. The space is significantly reduced to almost 60%.

The pumping amount of the water supply pump 3 is set to the maximum water consumption at the peak time, and the high water tank 2 having a small capacity enough for the electric motor of the water pump to keep the minimum starting interval within a safe range. The weight and size are much smaller, almost 12% of that of the conventional gravity water supply system, and the cost is low. In addition, the influence on the building structure and the installation space are small,
Countermeasures against freezing and snow in cold regions are also easier.

By providing the pressure water tank 4 at the upper part of the building where it can be installed, the set pressure of the pressure water tank 4 is reduced, the structural strength is reduced, and the manufacturing cost is reduced.

[0025] Reducing the pressure requires even less pressure in Japan, which obviates the regulations of the Occupational Safety and Health Law, and eliminates the need for complicated legal regulations.

Alternatively, in the prior art, in order to be exempt from the regulations of the Industrial Safety and Health Law, a necessary number of pressure water tanks of 40 liters or less were provided to cope with the problem, but such palliative and complicated means are not required. .

In the prior art, the diaphragm was provided so that the air in the pressure water tank did not dissolve into the water. However, the present invention does not require a diaphragm, so that the structure of the pressure water tank 4 is different from that of the prior art. Thus, the water level in the pressure water tank 4 can be controlled by a water level sensor using an electrode rod.

The control by the water level sensor using the electrode rod is more reliable in operation than the control by the pressure sensor used in the conventional technology, can be set finely, is inexpensive, and is easy to maintain and inspect. The maintenance cost is also low.

Further, a complicated control circuit and control parts for controlling the number and the number of rotations of the water supply pump according to the water supply amount are required, and it is necessary to dare to adopt a pump direct water supply system which requires a great deal of cost and complicated maintenance. There is no.

In the case of a small high-capacity water tank or a pressure water tank,
Various piping materials can be freely combined to form an elevated water tank or a pressure water tank, and a narrow place of a building or the back of a hut can be used as an installation place of an elevated water tank or a pressure water tank.

Further, in the case of a high-capacity water tank or a pressure water tank having a small capacity, the storage time of water in the water tank is shortened, and fresher water can be supplied to the water supply consuming point.

[Brief description of the drawings]

FIG. 1 is a diagram of a gravity water supply system.

FIG. 2 is a diagram showing a plurality of pumping water supply pipes of the gravity water supply system of FIG. 1;

FIG. 3 is a diagram when a plurality of high water tanks of the gravity water supply system are provided.

FIG. 4 is a diagram when a plurality of water supply pumps are used in the gravity water supply system.

FIG. 5 is a diagram of an embodiment of a piping in the vicinity of an elevated water tank of a gravity water supply system.

FIG. 6 is a diagram of an embodiment of a piping in the vicinity of an elevated water tank of the gravity water supply system.

FIG. 7 is a view near a pressure water tank of the pressure water supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pumping water supply pipe 2 Elevated water tank 3 Water supply pump 4 Pressure water tank 5 Valve 6 Intake valve 7 Shut-off valve at the time of pumping 8 Water supply branch pipe 9 Drainage valve 11 Pumping pipe 12 Water supply pipe 13 Secondary water supply pipe 21 Stop water surface 22 Start-up water surface 23 Follow-up stop Water surface 24 Follow-up activation water surface 41 Atmospheric pressure water surface

Claims (5)

[Claims] An elevated water tank and a pumping water supply pipe having one end connected to a discharge port of a water supply pump and the other end connected to the elevated water tank, and a water supply branch pipe branched from the pumping water supply pipe. Water supply system. 2. A pumping water supply pipe 1 is branched near the elevated water tank 2 and is connected to an upper part of the elevated water tank 2 through a water pumping pipe 11 and a lower part of the elevated water tank 2 through a shutoff valve 7 at the time of pumping. <2> The water supply system according to <1>, comprising a water supply pipe 12 connected and connected. 3. Branching from the pumping water supply pipe 1 in the vicinity of the elevated water tank 2 and connected to the elevated water tank 2 immediately below the stop water surface 21 of the elevated water tank 2 through the shutoff valve 7 during pumping. <2> The water supply system according to <1>, wherein the auxiliary water supply pipe 13 is provided. 4. The starting water surface 22 and the stopping water surface 2 of the elevated water tank 2.
The water supply system according to claim 1, claim 2, or claim 3, wherein the amount of water between them is set to a minimum activation interval within a safe range of the electric motor of the water supply pump 3. 5. The water supply system according to claim 1, 2 or 3, wherein the elevated water tank 2 is replaced with a pressure water tank 4.