JPS586072B2 - 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 for pumping water to the elevated water supply tank. This invention relates to an automatic water supply device that does not require any connection means.

Conventionally, automatic pump operation for pumping water to an elevated water supply tank involves 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 supply tank will be drained from the pump main pipe, pump, and water intake pipe. water supply source (hereinafter referred to as a water tank in this application).

), but in this case, the backflow water is turbid in the same way as (1) (rust and limescale, etc. that naturally occur and adhere to the pumping main pipe, are washed away by the backflow and are stripped off at once). Furthermore, since it stirs the inside of the water tank, it makes the inside of the water tank even more turbid.

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

Furthermore, in Patent Law 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 supply tank will not be full of water, and the water level in the tank will not exceed the patent limit. The pump stops at a water level slightly higher than the water level L' shown in No. 825015 and does not reach the water level 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 first aspect of the present invention is that the water stored in the elevated water tank is increased to a predetermined upper limit water level at the open end of the pumping main pipe directly above the elevated water tank, which pumps water from above to the tank. A self-closing valve with a float is installed so that the float rises and completely or partially closes the open end when the water reaches the elevated water supply tank. The valve is opened only for the flow toward the water supply tank, and communicates with a short-circuit pipe equipped with a check valve that prevents the reverse flow, and the automatic closing valve with a float operates and closes the water pumping main pipe at the pump discharge port. A pressure detector for stopping the pump detects the increase in pump discharge pressure that occurs when the pump discharges, and operates to keep the pump stopped. When the water level in the tank and in the field water main falls 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 starting pressure detector installation part is detected and operates to start the pump. The feature is that a pressure detector for starting the pump is installed, and the second feature is that the amount of water stored in the elevated water tank is increased at the open end of the pumping main pipe directly above the water tank that pumps water from above the elevated water tank to the tank. An automatic closing valve with a float is installed so that when the water level in the tank reaches the upper limit water level, the float rises and completely or partially closes the open end. The pump discharge port is connected to the water supply pipe leading to the use end by a short-circuit pipe equipped with a check valve that opens only for flow from the pumping main pipe to the water supply pipe and prevents the reverse flow. A pressure detector for stopping the pump is installed in the pumping main pipe of the section, which operates to detect the pump discharge pressure when the above-mentioned automatic closing valve with a float operates and closes, and keeps the pump stopped. When the amount of water stored in the elevated water supply tank and water supply pipes decreases due to the water supply, and the water level in the water supply pipes and pumping main pipes drops to the specified lower limit water level, the water head from the lower limit water level to the horizontal surface of the starting pressure detector installation part will cause static water. This device is characterized by being equipped with a pump starting pressure detector that detects pressure and starts the pump.

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 elevated water supply tank 4, but the pumping main pipe 6 opens above the elevated water supply tank 4, An automatic closing valve 8 with a float is fixed to the open end 7 of the pumping main pipe so that when the upper limit water level U of the elevated water supply tank 4 is detected, a float 8' rises to close the open end 7 of the pumping main pipe. ing.

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

The pressure detector 11 for stopping the pump and the pressure detector 12 for starting the pump are arranged near the pump discharge part 2' so as to be able to detect the pressure in the discharge main pipe 6 near the discharge part 2' of the pump 2. .

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, 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, and most of the water flows from the pumping main pipe open end 7, and a part of the water flows through the pumping main pipe open end 7. Short circuit pipe 9
The water is pumped to the elevated water supply tank 4 via
When the amount of water stored in the tank increases and the water level reaches the upper limit water level U, the first
In the figure, since the float 8' is floating on the water surface, the upper limit water level U is detected and the automatic closing valve 8 with the float is immediately closed.

At this time, the discharge side of the pump 2 is in a fully closed operation, and the discharge pressure is the fully closed discharge pressure of the pump and increases rapidly compared to when pumping water, but the pump stop pressure detector 11 detects this increased pump discharge pressure. This signal acts to cut off the power supply (not shown) to the electric motor 3 and stop the operation of the pump 2.

When the water level in the elevated water supply tank 4 gradually falls due to the use of water and reaches the opening water level U' of the automatic closing valve with float,
The automatic closing valve 8 with a float opens again and the pressure inside the pumping main pipe 6 returns to the normal pumping state, but the pump 2
is kept stopped by an electrical circuit located elsewhere, while the water level at the top of the pumping main 6 is
Check valve 1 that opens only for flow from the elevated water supply tank 4 to the elevated water supply tank 4
Since the pumping main pipe 6 and the elevated water supply tank 4 are in communication with each other through the short-circuit pipe 9 that interposes As water is used, the water level decreases as the water level inside the elevated water supply tank 4 decreases.

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 12 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 12,
This signal causes the power supply to remain cut off, and the stopped pump 2 is forced to shut off the power supply and is started to resume operation and pumping water.

As described above, the device of the present invention connects the pump 2 to the elevated water supply tank 4.
When the water level changes within the range, water is supplied via the float 8' by accurately repeating stopping and operation between the upper limit water level U and the lower limit water level L.

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

In this embodiment, the structure and function are the same as in the first embodiment, except that the short-circuit pipe 9 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. be.

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 is pumped, although the pressure does not increase to the fully closed discharge pressure as in the two embodiments described above, the discharge side of the pump 2 is throttled and the resistance is increased to pump water, so the discharge pressure of the pump 2 increases. The pressure rises more rapidly than during normal pumping operation.

The pump 2 is stopped by this increased pump discharge pressure, 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 even when the valve 8 is closed, a small amount of water is removed. FIG. 2 is a schematic layout diagram of an embodiment configured to intentionally cause leakage.

As is clear from the above description, the device of the present invention can simplify the overall configuration and does not require any connection means such as a control circuit between the elevated water supply tank and the pump, so such a connection means can be installed in buildings, etc. Not only is it an extremely economical automatic water supply system that does not require extra labor costs, material costs, or maintenance inspections, but it is also a pump that can operate accurately between the upper and lower limit water levels in the elevated water supply tank and has an appropriate starting and stopping frequency. The 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 resulting turbidity of the water stored in the water tank are completely prevented, and the system is completely effective from a health and hygiene perspective. play.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the device of the present invention,
FIG. 1 is a schematic layout diagram of the first embodiment, FIG. 2 is a schematic layout diagram of the second embodiment, and FIGS. 3 and 4 are schematic diagrams showing other examples of the automatic closing valve structure. 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 stop pressure detector, 12...Pump start pressure 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 above-mentioned automatic closing valve with a float is connected to the pumping main pipe at the pump discharge port by a short-circuit pipe that opens only for flow from the main pipe to the elevated water supply tank and is equipped with a check valve that prevents the reverse flow. A pump stop pressure detector that detects the increase in pump discharge pressure that occurs when the pump closes and operates to keep the pump stopped, and a pump stop pressure detector that operates to keep the pump stopped and water stored in the elevated water tank by supplying water to each use end. When the water level in the tank and pumping main pipe decreases to a predetermined lower limit water level, the system detects the hydrostatic pressure due to the water head from the lower limit water level to the horizontal surface of the starting pressure detector installation part and starts the pump. An automatic water supply device characterized by being equipped with a pressure detector for starting the pump. 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 that completely or partially closes the open end is installed between the pumping main pipe and the water supply pipe leading from the elevated water supply tank to the use end.
The above-mentioned automatic closing valve with a float is connected to the pumping main pipe at the pump discharge port by a short-circuit pipe that is opened only for the flow from the pumping main pipe to the water supply pipe and interposed with a check valve that prevents the reverse flow. A pressure detector for stopping the pump operates to detect the pump discharge pressure when the pump closes and keeps the pump stopped, and the water stored in the elevated water supply tank and water supply pipes is reduced by supplying water to each use end. Then, when the water level in the water supply pipe and pumping main pipe drops to a predetermined lower limit water level, the pump is activated by detecting the hydrostatic pressure due to the water head from the lower limit water level to the horizontal surface of the starting pressure detector installation part. An automatic water supply device characterized by being equipped with a pressure detector for pump starting.