JPH08277781A - Water feeding device - Google Patents

Abstract

PURPOSE: To restrain large impact by closing an automatic opening and closing valve after slowly stopping a pump when the pump stop water level is detected by a water level detecting unit in a high position water tank, and slowly starting the pump after opening the automatic opening and closing valve when the pump operation water level is detected. CONSTITUTION: A pressurizing pump 13 provided with a variable speed means 25 is directly connected to a piping 11, water is once stored in a high position water tank 14, and water is supplied to a terminal water feeding equipment 17 through a connection pipe 18B. The water level in the high position water tank 14 is read from a water level detecting unit 24, whether the water level in the high position water tank 14 is the stop water level H or not is judged, the operating speed of the pressurizing pump 13 is gradually decreased so as to slowly stop the pump, and an automatic opening and closing valve 16 is closed. When the water level is not the pump stop water level H, the operation of the pump is continued. Next, whether the water level is the pump operation water level L or not is judged, the automatic opening and closing valve 16 is opened, and the pressurizing pump 13 is slowly started. When the water level is not the pump operation water level L, the stoppage of the pump is continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device, and in particular, it directly pumps water from a water distribution pipe to a high water tank installed on the roof of a building or the like via a pressure pump, and then from the high water tank to a terminal water supply device. The present invention relates to a so-called direct connection type water supply device having a water supply system.

[0002]

2. Description of the Related Art FIG. 1A shows a system outline of a direct connection type water supply device. For example, an inflow pipe 12 is connected to a water distribution pipe 11 which is a main water pipe, and a pressurizing pump 13 is connected to the inflow pipe via a water meter 15 or the like. Pressure pump 1
On the discharge side of 3, the high water tank 14 provided on the roof of the building, etc.
A connection pipe 18 connected to the terminal water supply device 17 is connected via the. A check valve 19, an automatic opening / closing valve 16 and the like are connected to the connecting pipe 18. Check valve 1 here
9 is the pump 1 when the pressure on the side of the water distribution pipe 11 decreases
3 is a blocking valve for preventing backflow from the discharge side of No. 3.
The automatic opening / closing valve 16 is a valve for separating the high water tank 14 side and the pressurizing pump 13 side when the pump is stopped, and the opening / closing is controlled by the valve opening / closing drive device 20.

The pump 13 is driven at a variable speed by an electric motor (variable speed means) 25 having a frequency / voltage converter (inverter) connected to a three-phase 200V commercial power source. The control unit 22 sends a signal to the variable speed means 25 based on the signals from the inflow pressure detector 21 and the discharge pressure detector 23 to control the rotation speed of the pump 13 to an arbitrary speed.

Japanese Unexamined Patent Publication Nos. 5-118280 and 5
According to Japanese Patent Application Laid-Open No. 263444/1993 and Japanese Patent Application Laid-Open No. 5-240186, the speed of the pump is kept constant so as to constantly supply water of a predetermined pressure to the terminal water supply equipment. A technique for increasing or decreasing the is disclosed. Further, in order to prevent the water pressure from decreasing in the water distribution pipe, when the pressure on the inflow side of the pump decreases, the speed of the pump is reduced or stopped to prevent the pressure decrease on the water distribution pipe side. Etc. are disclosed.

In such a direct connection type water supply device, as compared with a conventional water pipe connected to a water storage tank and the water stored in the water storage tank is distributed to a terminal water supply device using a pressure pump,
There are various advantages. The merit is that since the water tank is not provided, the water supply device can be downsized as a whole and the installation area can be reduced. It is preferable for hygiene because water is not stored. Since the water pressure of the water distribution pipe can be used as it is on the suction side of the pressurizing pump, the head of the pressurizing pump is lowered, and energy can be saved accordingly.

FIG. 1B shows an outline of an elevated water tank provided on the roof of a building or the like. The elevated water tank 14 has a pressure pump 1
Water flows into the water tank from the inflow port 18A of the connecting pipe 18 connected to the discharge side of No. 3. Then, the water flows out from the outlet 18B of the connecting pipe 18 connected to the terminal water supply device 17 side, and is supplied to the terminal water supply device 17. The high water tank 14
A water level detector 24 such as an electrode rod is provided to detect that the water level is the pump operating water level (L) and the pump stop water level (H).

That is, when the water stored in the high water tank 14 is supplied to the terminal water supply device 17, the water level thereof gradually decreases. When the pump operating water level (L) is reached,
The water level detector 24 detects this, transmits a signal to the control unit 22, the pressurizing pump 13 is activated by a command from the control unit 22, and the automatic open / close valve 16 opens to send water to the high water tank 14.
Then, the water level in the elevated water tank 14 gradually rises, and when it reaches the pump stop water level (H) at which the water in the elevated water tank is full, the water level detector 24 detects this and sends a signal to the control unit 22. To send. Then, the control unit 22 stops the pump 13 and also closes the automatic opening / closing valve 16.

According to this water supply system, the terminal water supply device 17 is supplied with water from the elevated water tank provided on the roof of the building or the like, so that the water is always supplied at a substantially constant pressure, which causes an extreme increase or decrease in water pressure. Problems are avoided and a comfortable water supply is provided.

[0009]

However, in the conventional water supply device before the direct connection type, since the water tank was provided on the inflow side of the pressurizing pump, the inflow side of the pressurizing pump was kept at a substantially zero pressure state. However, the pressure on the pump inflow side did not rise unlike the direct connection type. However, in the case of the direct connection type as described above, for example, when the water level in the elevated water tank lowers and reaches the pump operating water level, the pump is activated and the automatic opening / closing valve is opened. At that time, if the pressure on the water pipe side is high,
Further, the pressure pressurized by the pump is applied to the connecting pipe connected to the elevated water tank, and a great impact is given to the connecting pipe and various valves connected to the connecting pipe. Similarly, when the water level in the elevated water tank rises and the pump stop level is reached, the pump operation is immediately stopped and the automatic opening / closing valve is closed. It will give a shock.

The present invention has been made in view of the above-mentioned circumstances, and in a direct connection type water supply device equipped with a high water tank, a stable water supply operation to the high water tank is possible even if the inflow pressure of the pump fluctuates. It is an object to provide a water supply device that can be performed.

[0011]

The water supply device of the present invention comprises an inflow pipe connected to a water distribution pipe, a pressurizing pump connected to the inflow pipe, and a high-pressure device connected to the discharge side of the pressurizing pump. After pumping to the water tank, a connecting pipe for supplying water from the elevated water tank to the terminal water supply device, an automatic opening / closing valve provided in the middle of the connecting pipe for connecting the pressure pump and the elevated water tank, and the inside of the elevated water tank A water level detector for detecting the water level of the water tank, and a control means for controlling the pressure pump, the control means comprising means for slowly starting and stopping the pressure pump, When the water level detector in the water tank detects the pump stop water level, the pump is first stopped slowly, then the automatic open / close valve is closed, and when the water level detector detects the pump operating water level, the automatic open / close valve is first opened and then the addition Start pressure pump slowly And wherein the Rukoto.

Further, the water supply device of the present invention includes an inflow pipe connected to the water distribution pipe, a pressurizing pump connected to the inflow pipe,
A connecting pipe connected to the discharge side of the pressurizing pump and pumping water to the elevated water tank, and then supplying water from the elevated water tank to the terminal water supply device,
An automatic opening / closing valve provided in the middle of a connecting pipe connecting the pressurizing pump and the elevated water tank, a water level detector for detecting the water level of the water tank provided in the elevated water tank, and the pressurizing pump. A control means for controlling the control means, the control means includes means for slowly starting and stopping the automatic opening / closing valve, and when the water level detector in the elevated water tank detects a pump stop water level, the automatic opening / closing valve is slowly closed. After that, the pump is stopped, and when the water level detector detects the pump operating water level, the pump is first activated and then the automatic opening / closing valve is slowly opened.

[0013]

[Operation] When the water level in the elevated water tank is lowered and the pressurizing pump is started, the automatic opening / closing valve is first opened and then the pump is slowly started, so that even if the inflow side pressure rises,
Since the pressure inside the connecting pipe gradually rises, a large impact is prevented from being applied. When stopping the pressure pump, first stop the pump slowly, then
Since the automatic opening / closing valve is closed, the pressure inside the connecting pipe gradually decreases, and similarly, a large impact is prevented.

When the water level in the elevated water tank is lowered and the pressurizing pump is started, the pump is first started and then the automatic opening / closing valve is slowly opened, so that even if the pressure on the inlet side is increased, the inside of the connecting pipe is increased. Since the pressure of the is gradually increased, a large impact is prevented from being applied. Further, when stopping the pressurizing pump, first, the automatic on-off valve is slowly closed and then the pump is stopped, so that the pressure inside the connecting pipe is gradually lowered, and similarly, a large impact is prevented from being applied. It

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first and second embodiments of the present invention will be described below with reference to the accompanying drawings. Also in this embodiment, a system in which the pressure pump 13 is directly connected to the water distribution pipe 11, water is temporarily stored in a high water tank provided on the roof of a building, and the water is supplied from there to the terminal water supply device 17 via a connecting pipe 18. The structure is as shown in FIG. The high water tank 14 is also provided with the water level detector 24 that detects the pump stop water level H and the pump operating water level L such as the electrode rod.

An automatic opening / closing valve 16 is provided in the middle of a connecting pipe 18 connecting the pressurizing pump 13 and the elevated water tank 14. In the first embodiment, the opening / closing valve 16 is opened / closed by a valve opening / closing drive device 20. Is done instantaneously. Pressure pump 13
Is equipped with means for driving the pressurizing pump slowly, which is driven by a variable speed means 25 such as an inverter and gradually increases the operating speed when the pump is started. Further, there is provided means for gradually reducing the operating speed of the pressurizing pump 13 even when the pump is stopped so as to slowly stop the pump.

Further, in the second embodiment of the present invention,
The valve opening / closing drive device 20 of the automatic opening / closing valve 16 slowly opens and closes over a period of several seconds. This is achieved, for example, by combining an automatic valve 16 such as a proportional control motor valve capable of adjusting the valve opening degree with an electric signal and a valve opening / closing drive device 20 that outputs a valve opening degree signal so that the automatic valve slowly opens and closes. It can be carried out. The pump B is started and stopped instantaneously.

FIG. 2 shows the structure of the control unit of the water supply system of the above embodiment of the present invention. The water level detector 24 of the elevated water tank 14 lowers the water level in the elevated water tank and transmits a water level L signal, which is the water level at which the operation of the pump should be started, to the control unit 22.
Similarly, water is pumped into the high water tank, the high water tank is filled up, and the water level L signal at which the operation of the pump 13 should be stopped is transmitted.

In the first embodiment of the present invention, the control unit 2
2 slowly starts or stops the pump 13, and the automatic opening / closing valve 16 momentarily opens and closes. On the other hand, in the second embodiment of the present invention, the control unit 22 uses the automatic opening / closing valve 16
Is slowly opened or closed, and the pump 13 is momentarily started or stopped.

FIG. 3 shows a control flow of the pump and the automatic opening / closing valve of the first embodiment of the present invention. In the control device 22,
The routine described below is incorporated. First, the water level in the elevated water tank 14 is read from the water level detector 24. Then, it is determined whether or not the water level in the elevated water tank has risen to reach the water level H at which the pump should be stopped. If yes,
Gradually reduce the operating speed of the pump and stop slowly.
Then, the automatic open / close valve 16 is closed. When the water level is not L, the pump operation is continued. Next, it is determined whether or not the water level in the elevated water tank is lowered and the operating water level L to be supplied to the elevated water tank is reached. When the operating water level is L, the automatic opening / closing valve 16 is first opened, and then the pressurizing pump 13 is slowly started. If the water level is not L, the pump continues to be stopped.

FIG. 4 shows the operation of each part of the water supply device according to the control flow described above. At time t ₀ , the pump is stopped, and the water in the high water tank 14 is at the end water supply device 17
The water level is gradually decreasing. Time t
_{When the} water level in the high water tank reaches the pump operating water level L in 1,
First, the automatic open / close valve 16 is opened. Then, the pump starts slowly and the pump speed gradually increases. And
After a few seconds, the pump shifts to operation at a constant speed so that the pressure of the discharge pressure detector 23 becomes a predetermined value. The water level in the elevated water tank gradually rises after time t ₁ . The water pressure in the connecting pipe 18 that connects the elevated water tank 14 and the pressurizing pump 13 gradually rises (starting from time t ₁ ) with the start of the pump operation as shown in the figure, and is predetermined when the pump operation speed becomes constant. Will be applied.

At time t ₂ when the water level in the elevated water tank reaches the water level H at which the pump should be stopped, the pump starts to slowly stop. That is, the operating speed gradually decreases from time t ₂ , the pump stops at time t ₃ , and the automatic opening / closing valve 16 closes. Therefore, the water level in the elevated water tank rises slightly as the pump decelerates, but gradually decreases with the supply of water to the terminal water supply equipment after the time t ₃ when the pump stops. The pressure in the connecting pipe 18 that connects the pressurizing pump 13 to the elevated water tank 14 gradually decreases as the pump speed decreases, and the automatic opening / closing valve 16 closes, so that the pressure becomes substantially zero.

FIG. 5 shows a control flow of the pump and the automatic opening / closing valve of the second embodiment of the present invention. In the control device 22,
The routine described below is incorporated. First, the water level in the elevated water tank 14 is read from the water level detector 24. Then, it is determined whether or not the water level in the elevated water tank has risen to reach the water level H at which the pump should be stopped. If yes,
Gradually reduce the valve opening and close slowly. Then, the pump 13 is stopped. When the water level is not L, the pump operation is continued. Next, it is determined whether or not the water level in the elevated water tank is lowered and the operating water level L to be supplied to the elevated water tank is reached. When the operating water level is L, first the pump 13 is started, and then the automatic opening / closing valve 16 is slowly opened.

FIG. 6 shows the operation of each part of the water supply device according to the control flow described above. At time t ₀ , the pump is stopped, and the water in the high water tank 14 is at the end water supply device 17
The water level is gradually decreasing. Time t
_{When the} water level in the high water tank reaches the pump operating water level L in 1,
First, the pump 13 is started. Then, the automatic opening / closing valve 16 slowly opens, and the flow rate gradually increases. The water level in the elevated water tank gradually rises after time t ₁ . As shown in the figure, the water pressure in the connecting pipe 18 that connects the elevated water tank 14 and the pressurizing pump 13 gradually rises (starting from time t ₁ ) with the start of pump operation, and when the valve opening reaches a predetermined value. A predetermined pressure will be applied.

At time t ₂ when the water level in the elevated water tank reaches the water level H at which the operation of the pump should be stopped, the automatic opening / closing valve starts to slowly close. That is, the valve opening gradually decreases from time t ₂ , the valve closes at time t ₃ , and the operation of the pump 13 is stopped. Therefore, the water level in the elevated water tank rises slightly with the closing of the automatic opening / closing valve, but gradually decreases with the supply of water to the terminal water supply equipment after time t ₃ when the pump is stopped. The water pressure in the connecting pipe 18 that connects the pressurizing pump 13 to the elevated water tank 14 is gradually reduced with a decrease in the valve opening degree, and by closing the automatic opening / closing valve 16,
The pressure is almost zero.

In the above-mentioned embodiment, either the pump or the automatic opening / closing valve is opened / closed slowly, but both of them may be opened / closed slowly.

[0027]

According to the present invention as described above,
This is a direct connection type water supply device equipped with a high water tank, in which a pressurizing pump or an automatic opening / closing valve is slowly opened or closed. Therefore, the water pressure in the connecting pipe from the pressurizing pump to the elevated water tank slowly rises and falls slowly. Therefore, in the direct connection type water supply device, even when the pressure on the inflow side is high, the problem that a large impact is given to the connecting pipe from the discharge side of the pressurizing pump to the elevated water tank is prevented.

[Brief description of drawings]

FIG. 1A is an explanatory view of a system configuration of a direct connection type water supply device including a high water tank, and FIG. 1B is an explanatory view of a high water tank.

FIG. 2 is an explanatory diagram of a control system of the water supply device according to the embodiment of the present invention.

FIG. 3 is a control flow chart of the first embodiment of the present invention.

FIG. 4 is a time chart showing the state of each part of the water supply device in the above embodiment.

FIG. 5 is a control flow chart of the second embodiment of the present invention.

FIG. 6 is a time chart showing the state of each part of the water supply device in the above embodiment.

[Explanation of symbols]

 13 Pressure Pump 14 High Water Tank 16 Automatic Open / Close Valve 18 Connection Pipe

Claims (2)

[Claims] 1. An inflow pipe connected to a water distribution pipe, a pressurizing pump connected to the inflow pipe, and a pump connected to a discharge side of the pressurizing pump to pump water to a high water tank, and then from the high water tank. A connection pipe for supplying water to the terminal water supply device, an automatic opening / closing valve provided in the middle of the connection pipe for connecting the pressure pump and the elevated water tank,
A water level detector provided in the elevated water tank for detecting the water level of the water tank and a control means for controlling the pressure pump are provided, and the control means includes means for slowly starting and stopping the pressure pump. When the water level detector in the elevated water tank detects the pump stop water level, the pump is slowly stopped first, and then the automatic opening / closing valve is closed, and when the water level detector detects the pump operating water level, the automatic opening / closing valve is first provided. And then slowly starting the pressurizing pump. 2. An inflow pipe connected to a water distribution pipe, a pressurizing pump connected to this inflow pipe, and a pump connected to a discharge side of the pressurizing pump to pump water to a high water tank, and then from the high water tank. A connection pipe for supplying water to the terminal water supply device, an automatic opening / closing valve provided in the middle of the connection pipe for connecting the pressure pump and the elevated water tank,
A water level detector provided in the elevated water tank for detecting the water level of the water tank and a control means for controlling the pressurizing pump are provided, and the control means includes means for slowly starting and stopping the automatic opening / closing valve. When the water level detector in the elevated water tank detects a pump stop water level, the automatic on-off valve is first slowly closed and then the pump is stopped, and when the water level detector detects the pump operating water level, the pump is started first. After that, the water supply device is characterized in that the automatic opening / closing valve is slowly opened.