JPS586073B2 - automatic water supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrical connection between an elevated water supply tank installed at a high place such as a rooftop and a pump installed at a low place such as the ground or basement to pump water to the elevated water supply tank. This invention relates to an automatic water supply device that does not require any connection means.

Automatic operation of the pump to pump water to the elevated water supply tank is achieved by detecting the height of the water surface using a water surface detection means in the elevated water supply tank, such as a float switch, and using this signal to automatically operate the pump via an electrical connection. However, it is not preferable because electrical connection requires special equipment and labor costs, and maintenance and inspection to prevent wire breakage must be performed constantly.

Although Japanese Patent No. 825015 has been proposed to solve these drawbacks, the water supply device has the following essential drawbacks.

That is, the conduit from the pump to the elevated water supply tank (hereinafter referred to as the pumping main pipe in the present invention).

) is fixed at the bottom of the elevated water supply tank. (1) Pumping water into the elevated water supply tank agitates the bottom of the tank, which prevents dirt such as limescale and fine dust from settling at the bottom of the tank. Each time the water is pumped up, it is suspended to make the water stored in the water supply tank turbid, and the turbid water is supplied to the end of use.

(2) In the unlikely event that the foot valve, check valve, etc. attached to the pump malfunctions and becomes unable to close, when the pump is stopped, the water pumped into the elevated water tank will be transferred to the main pump, pump, and suction pipe. The backflow water flows back to the water supply source (hereinafter referred to as the water tank in this application), but in this case, the backflow water is turbid (1) as well (due to rust and limescale naturally occurring and attached to the pumping main pipe). etc., which are washed away by the backflow and become turbid as they are stripped all at once), and because they stir the inside of the water tank, it becomes even more turbid.

Therefore, the device of Patent No. 825015 does not solve the sanitary problem.

Furthermore, in Patent No. 825015, a timer is used to set the pump operation time to a constant value, so when a large amount of water is used, the elevated water tank will not become full of water.
The water level in the tank is the water level L shown in Patent No. 825015.
The pump stops when the water level is slightly higher than ', and the water level does not reach L.

Therefore, the frequency of starting and stopping of the pump increases, and there is a high risk of burnout of the electric motor and the like.

The invention of the patent application filed on December 8, 1976 solves the above-mentioned drawbacks, but the invention of the present application obtains the same effect with a different structure and operation. When the amount of water stored in the elevated water tank increases and the water level in the tank reaches a predetermined upper limit water level,
A self-closing valve with a float is installed so that the float rises and completely or partially closes the open end of the lift main, and between the lift main and the lower part of the elevated water tank, from the lift main to the elevated water tank. They are connected by a short-circuit pipe with a check valve that opens only for the opposite flow and prevents the opposite flow.The diameter of the short-circuit pipe is smaller than that of the pump main pipe. A pump pumping flow detector is installed in the water suction pipe that detects the decrease in the flow velocity in the pipe due to the reduction in pumping volume when the automatic closing valve closes and operates to keep the pump stopped. At the same time, when the water stored in the elevated water supply tank decreases due to the supply of water to each use end, and the water level in the tank and the pumping main pipe drops to the predetermined lower limit water level, the pressure detector mounting part for pump starting is activated from the lower limit water level. The feature is that a pump starting pressure detector that detects the hydrostatic pressure due to the water head up to the horizontal surface and operates to start the pump is attached to the pumping main pipe at the pump discharge port. When the amount of water stored in the elevated water intake tank increases and the water level in the tank reaches the upper limit water level, a float is raised at the open end of the main water pumping pipe directly above the water supply tank that pumps water from above to the same tank, completely or partially. An automatic closing valve with a float is installed to automatically close the open end, and the flow from the pumping main pipe to the water supply pipe is installed between the pumping main pipe and the water supply pipe leading from the elevated water supply tank to the service end. They are connected by a short-circuit pipe with a check valve that opens only when the pump is open and prevents the reverse flow.The diameter of the short-circuit pipe is smaller than that of the pump main pipe. A pump pumping flow detector is installed in the pipe to detect a decrease in the flow velocity in the pipe due to a reduction in the pumping amount when an automatic closing valve is operated and closed, and the pump is operated to keep the pump stopped. When the water stored in the elevated water supply tank and water supply pipe decreases due to water supply to each use end, and the water level in the water supply pipe and pumping main pipe drops to a predetermined lower limit water level, the pump starts from the lower limit water level on the horizontal surface of the pressure detector mounting part. This system is characterized in that a pump starting pressure detector that operates to detect the hydrostatic pressure due to the water head up to and starts the pump is attached to the pumping main pipe at the pump discharge port.

The present invention will be described below with reference to embodiments shown in the accompanying drawings.

First Embodiment In the schematic layout of the first embodiment shown in FIG. 1, 1 is a water tank, 2 is a pump, 3 is an electric motor for driving the pump 2, and 4 is an elevated water tank. A water suction pipe 14 to which a foot valve 15 is fixed is provided at the lower end of the space between the pumps 2 and 2.
A pumping main pipe 6 with a pumping main check valve 16 interposed is installed between the elevated water supply tank 4 and the pumping main water tank 4, but the pumping main pipe 6 opens above the elevated pongee water tank 4. An automatic closing valve 8 with a float is fixed to the open end 7 of the pumping water main pipe, which closes the open end 7 of the pumping water main pipe by raising a float 8' when the upper limit water level U of the elevated water supply tank 4 is detected. It is set up.

At the bottom of the elevated water supply tank 4, the tank 4 and the main water supply pipe 6 are communicated by a short-circuit pipe 9, and the short-circuit pipe 9 has a reverse valve that opens only for flow from the main water supply pipe 6 to the elevated water supply tank 4. A stop valve 10 is provided.

Here, the diameter of the short-circuit pipe 9 is smaller than that of the main pumping pipe 6.

The pump pumping water flow detector 12 and the pump starting pressure detector 11 are arranged near the pump discharge part 2' so as to be able to detect the flow and pressure of pumped water in the discharge main pipe 6 near the discharge part 2' of the pump 2. has been done.

5 is a water supply pipe, 13 is a used end of each end of the water supply pipe 5,
16 is a pumping main pipe check valve.

To explain the operation of the present invention based on the first embodiment, the pump 2
When the water receiving tank 1 is operated, most of the water in the water tank 1 flows through the foot valve 15, the water suction pipe 14, the pump 2, the pumping main check valve 16, and the pumping main pipe 6. The water is pumped up to the elevated water supply tank 4 via the short-circuit pipe 9, but when the amount of water stored in the tank 4 increases and the water level reaches the upper limit water level U, the float 8' rises to the water surface in Fig. 1. As a result, the upper limit water level U is detected and the automatic closing valve 8 with a float is immediately closed.

At this time, the discharge side of the pump 2 is in a fully closed operation, the amount of pumped water approaches 0 (zero), and the flow rate of pumped water in the main pumping pipe 6 and suction pipe 14 also approaches O (zero), but the flow velocity in the pipes is slowed down. The pump pumping flow detector 11 detects the flow and uses this signal to cut off the power supply (not shown) to the electric motor 3 to stop the operation of the pump 2 and keep it stopped.

When the water level in the elevated water supply tank 4 gradually decreases due to the use of water and reaches the automatic closing valve opening water level U', the automatic closing valve 8 with a float opens again, while the water level at the top of the pumping main pipe 6 decreases. The pumping main pipe 6 is connected to the pumping main pipe 6 by a short-circuit pipe 9 interposed with a check valve 10 that opens only for the flow from the pumping main pipe 6 to the elevated water supply tank 4.
Because the elevated water supply tank 4 is in communication with the pumping main pipe 6
The water in the upper part flows to the elevated water supply tank 4 and reaches the same water level as the water level in the elevated water supply tank 4, and drops as the water level in the elevated water supply tank 4 falls due to water usage.

When the lower limit water level L corresponding to the location of the short-circuit pipe 9 is reached, the hydrostatic pressure acting on the horizontal surface of the mounting part of the pump starting pressure detector 11 corresponds to the water head H, and the hydrostatic pressure at this time is Compared to when the elevated water supply tank 4 is at the upper limit water level U, the hydrostatic pressure has decreased by the hydrostatic pressure corresponding to the water head H' between the upper limit water level U and the lower limit water level L, so the hydrostatic pressure is lower due to the above water head H. is detected by the pump starting pressure detector 11,
This signal causes the power supply to remain cut off and the stopped pump 2 to shut off the power supply, start up, and resume operation and pumping.

As described above, the device of the present invention connects the pump 2 to the elevated water supply tank 4.
When the water level in the tank is between the upper limit water level U and the lower limit water level L, water is supplied by accurately repeating stopping and operation.

Second Embodiment In the first embodiment, a short-circuit pipe 9 having a check valve 10 is provided at the bottom of an elevated pongee water tank 4. Generally, the tank is large, that is, the height of the tank 4 to the bottom of the tank is small. This is an example of a relatively large tank, but if the tank is small, that is, the height to the bottom of the tank is not very high (approximately 1 m or less), sufficient hydrostatic pressure cannot be obtained. Carry out as shown.

In this embodiment, a short-circuit pipe 9 having a diameter smaller than that of the pumping main pipe 6 is arranged below the elevated water supply tank 4 so as to communicate between the pumping main pipe 6 and the water supply pipe 5. Other than that, the structure and function are the same as the first embodiment.

FIG. 3 is a schematic layout diagram showing another example of the automatic closing valve structure with a float in the device of the present invention. A pumping main pipe normally open port 7' is opened near the pump 2 when viewed from the attached automatic closing valve 8.

In this example, when the inside of the elevated water supply tank 4 reaches the upper limit water level U and the automatic closing valve 8 with a float closes, the open end 7 of the pumping main pipe is closed and only the normally open port 7' of the pumping main pipe flows into the elevated water tank 4. Although the amount of water is reduced and the water can be pumped completely, the flow rate of the pumped water in the main pumping pipe 6 and water suction pipe 14 is O(
Although the water does not drastically decrease to zero (0), the water is pumped by increasing the throttle resistance on the discharge side of the pump 2, so the amount of water pumped by the pump 2 is reduced compared to normal operation, and the flow velocity in the pipe is still reduced.

The pump pumping flow detector 12 detects this deceleration and the pump 2 is stopped, but this operation is exactly the same as in the previous embodiment.

Note that the provision of the pumping main pipe normally open port 7' can be added as another aspect of the first and second embodiments.

Figure 4 shows that instead of opening the normally open port 7' in the pumping main pipe as described above, a through hole 8'' is bored in the automatic closing valve 8 with a float, so that a small amount of water is removed even when the valve 8 is closed. FIG. 2 is a schematic layout diagram of an embodiment configured to intentionally cause leakage.

FIG. 5 is a schematic layout diagram showing another embodiment of the pump 2 portion, in which a pump pumping flow detector 12 is interposed in a pumping bypass pipe 6' with respect to the pumping main pipe 6.

FIG. 6 is a schematic layout diagram similarly showing another embodiment,
A pump pumping flow detector 12 is interposed in the water suction pipe 14.

FIG. 7 is also a schematic layout diagram showing another example, in which the pump pumping flow detector 12 is connected to the water suction bypass pipe 1 with respect to the water suction pipe 14.
4'.

As is clear from the above, the device of the present invention has a simple overall configuration and does not require any connection means such as a control circuit between the elevated water supply tank and the pump. It is possible to create an extremely economical automatic water supply system that does not require extra labor costs, material costs, or maintenance and inspection. Automatic operation is repeated, and the turbidity of the water stored in the elevated water supply tank, the backflow from the elevated water supply tank to the water tank, and the accompanying turbidity of the water stored in the water tank are completely prevented, and it is completely effective in terms of health and hygiene. .

[Brief Description of the Drawings] The attached drawings show an example of the implementation of the device of the present invention,
Figure 1 is a schematic layout of the first embodiment, Figure 2 is a schematic layout of the second embodiment, Figures 3 and 4 are schematic diagrams showing other examples of automatic closing valve structures, and Figure 5. , FIG. 6, and FIG. 7 are schematic layout diagrams showing other examples of the pump portion. 1...Water tank, 2...Pump, 3...Electric motor, 4...Elevated water supply pump, 5...Water supply pipe, 6...Pumping main pipe, 7...Pumping main pipe open end, 7'...Pumping main pipe always open port, 8... Automatic closing valve with float, 8”...through hole, 9...short circuit pipe, 10...short circuit pipe check valve, 1
1...Pump starting pressure detector, 12...Pump pumping flow detector.

Claims (1)

[Scope of Claims] 1. At the open end of the pumping main pipe directly above the elevated water supply tank that pumps water from above to the tank, the amount of water stored in the elevated water supply tank increases and the water level in the tank reaches a predetermined upper limit water level. An automatic closing valve with a float is installed that raises the float to completely or partially close the open end of the pumping main pipe when the pumping water reaches the lower part of the elevated water tank. The valve is opened only for the flow from the main pipe to the elevated water supply tank, and the connection is made through a short-circuit pipe equipped with a check valve that prevents the reverse flow.The diameter of the short-circuit pipe is smaller than that of the main water pipe. Also, when the automatic closing valve with a float in the main pumping pipe or the water suction pipe of the pump is activated and closed, it detects the decrease in the flow velocity in the pipe due to the reduction in the amount of pumped water and operates to keep the pump stopped. When the water stored in the elevated water supply tank decreases due to water supply to each use end and the water level in the tank and pumping main pipe drops to a predetermined lower limit water level, the pump starts from the lower limit water level. Automatic water supply characterized in that the pumping main pipe at the pump discharge port is equipped with a pressure detector for starting the pump, which detects the hydrostatic pressure due to the water head up to the horizontal surface of the pressure detector mounting part and starts the pump. Device. 2. When the amount of water stored in the elevated water tank increases and the water level in the tank reaches the upper limit water level, a float will be raised at the open end of the pumping main pipe directly above the elevated water tank that pumps water from above to the tank. An automatic closing valve with a float is provided to completely or partially close the open end of the pumping main.
The valve between the water supply pipe connecting the elevated water supply tank with the pumping main to the service end is opened only for flow from the pumping main to the water supply pipe,
They are connected by a short-circuit pipe equipped with a reverse 1 valve to prevent the reverse flow, and the short-circuit pipe has a smaller diameter than the pumping main pipe. A pump pumping flow detector that detects the decrease in the flow velocity in the pipe due to a reduction in pump pumping volume when the pump is closed and operates to keep the pump stopped, and an elevated water supply system that supplies water to each use end. The amount of water stored in tanks and water pipes decreases,
A pump that operates so that when the water level in the water supply pipe and pumping main pipe drops to a predetermined lower limit water level, the hydrostatic pressure due to the water head from the lower limit water level to the horizontal surface of the pump starting pressure detector installation part is detected and the pump is started. An automatic water supply device characterized in that a starting pressure detector is attached to the pumping main pipe at the pump discharge port.