JPS6054520B2 - water supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a water supply device equipped with a pressure tank, and particularly to a mechanism for replenishing the pressure tank with an appropriate amount of air.

[Background of the Invention] In a water supply system, a pressure tank provided with an air reservoir is connected to a water supply pipe on the discharge side of a pump, and the influence of pulsations in the discharge pressure of the pump can be absorbed by expansion/contraction or expansion of the air. It is being done.

In addition, when the demand for water is small, even if the pump is stopped, the water stored in the pressure tank is pushed out by the expansion of air.
By continuing the supply, the frequency of starting the pump is reduced and the efficiency of the pump is increased. In such a water supply system, the air in the pressure tank is lost as water is continued to be supplied, so new air must be constantly replenished.

If a sumo wrestler continues to send air into the pressure tank, and the amount of air in the tank exceeds the appropriate value, air bubbles will easily form in the water being supplied. If air bubbles are mixed into the water supply, the water flowing from the faucet may splash or become cloudy, causing significant discomfort to customers. Moreover, since the water stored in the pressure tank conversely decreases, the frequency of starting the pump increases and the operating rate decreases. For this reason, it is necessary to always maintain an appropriate amount of air in the pressure tank.

For this reason, conventional methods have been to install a water level detection means such as an electrode or a float switch in the pressure tank and change the amount of air supplied according to the water level in the pressure tank, or to install an exhaust valve in the pressure tank to reduce the amount of excess air. It is common practice to exhaust the supplied air. However, these water supply devices are not only complicated and unreliable, but also expensive. [Object of the Invention] Therefore, the present invention provides a water supply device that has a small number of components and can constantly replenish a pressure tank with an appropriate amount of air.

[Summary of the Invention] The present invention is characterized by a pump, a pressure tank connected to a water supply pipe of the pump, an air supply tank connected to the pressure tank by a water supply pipe and an air supply pipe, and an air supply pipe connected to the air supply pipe. A check valve connected to the pressure tank to prevent water or air from flowing in from the pressure tank side, a drain pipe connected to the lower part of the air supply tank, a first gate valve connected to the drain pipe, and a first gate valve connected to the water supply pipe. a second gate valve that opens when the first gate valve is closed; and an air intake valve connected to an upper part of the air supply tank; Connect to the lower limit water level of the water supply pipe, and lift the center part above the connection point of the water supply pipe to the pressure tank and turn it into an inverted U.
The top of the inverted U-shape is located near the desired upper limit water level of the pressure tank, and the other end is connected below the air supply tank.

Therefore, if the air in the pressure tank is less than the appropriate value, the water in the pressure tank will flow through the water supply pipe into the air supply tank, and air will be supplied from the air supply tank to the pressure tank, and conversely, the air in the pressure tank will be at the proper level. If the value exceeds the value, the air in the pressure tank flows into the water supply pipe, and an inverted U-shaped action delays the intrusion of water into the air supply tank, thereby suppressing the amount of air supply from the air supply tank to the pressure tank. [Embodiments of the invention] Below,
The embodiment shown in the drawings will be described.

Reference numeral 1 denotes a pump, and a water pipe 2 is connected to the discharge side.

3 is a pressure tank connected to water pipe 2;

4 is a pressure switch that detects the pressure inside the pressure tank 3.

This pressure switch 4 starts the pump 1 at a predetermined lower limit pressure, and issues an operation command to stop the pump 1 when a predetermined upper limit pressure is reached. 5 is a water supply pipe arranged in an inverted U-shape with its central part raised, and one end 5a of this pipe is connected to the pressure tank 3 so that it communicates with the air portion 6 when the air in the pressure tank 3 exceeds an appropriate amount.
connected to the wall.

That is, as will be described in detail later, the lowest water level in the pressure tank 3 is maintained near the position where this one end 5a is connected. Therefore, in the embodiment, if the desired lowest water level at the time of the lower limit pressure is set to the lower limit water level LWL, in order to use the pressure tank 3 most efficiently, one end 5a of the water supply pipe 5 is connected to the position of the lower limit water level LWL. Connected. 1 (WL is the upper limit water level, and indicates the water level when the inside of the pressure tank 3 reaches the upper limit pressure by continuing to operate the pump 1 when the water surface is at the lower limit water level LWL at the lower limit pressure.

Reference numeral 7 denotes an air supply tank, which is provided below the attachment position of one end 5a of the water supply pipe 5, that is, below the lower limit water level LWL.

The other end 5c of the water supply pipe 5, which is bent into an inverted U-shape and raised to a position where the top 5b exceeds the lower limit water level LWL, is connected to the lower part of the air supply tank 7 so that water can flow smoothly. Further, the top portion 5b of the water supply pipe 5 is connected to the pressure tank 3.
When the water level in the pressure tank 3 falls below the lower limit water level LWL and the inside of the water supply pipe 5 is filled with compressed air from the pressure tank 3, even if the pump 1 starts operating and the water level in the pressure tank 3 rises, the water in the pressure tank 3 will continue to flow. Sufficient to prevent the air from easily flowing into the air supply tank 7 side (for example, close to the desired upper limit water level HWL)
It is meant to be lifted high. Note that the volume of the water supply pipe 5 is sufficiently smaller than the volume of the air supply tank 7. Reference numeral 8 denotes an air supply pipe, which connects the upper part of the air supply tank 7 and the desired lower limit water level LWL of the pressure tank 3.

Reference numeral 9 denotes a check valve connected to the air supply pipe 8, which prevents water or compressed air from flowing into the air supply tank 7 from the pressure tank.

That is, the air supply pipe 8 is provided below the desired lower limit water level LWL so that the check valve 9 is always in contact with the water in the pressure tank 3 and the operation of the check valve 9 is ensured. Reference numeral 10 denotes an air intake valve installed above the air supply tank 7, and is for taking in outside air into the air supply tank 7.

Reference numeral 11 denotes a drain pipe connected below the air supply tank 7, and is for discharging water or compressed air in the air supply tank 7.

Reference numeral 12 denotes a first gate valve connected to the drain pipe 11, and is configured to be open while the pump 1 is stopped.

13 is a second gate valve connected to the water supply pipe 5;
The gate valve 12 is configured to open when the gate valve 12 is closed.

Next, the operation of the device configured as described above will be explained.

It is now assumed that the pump 1 is stopped and the water stored in the pressure tank 3 is pushed out by the action of the compressed air in the pressure tank 3 to continue water supply. In this state, the first gate valve 12 is opened and the second gate valve 13 is opened.
is closed, the water in the air supply tank 7 is discharged through the water pipe 11, and the negative pressure generated at this time draws outside air into the air supply tank 7 through the air intake valve 10.
As the water supply continues, the air 6 in the pressure tank 3 flows out together with the water, and when the air 6 becomes insufficient, the pressure tank 3
The pressure inside the pressure tank 3 reaches the lower limit pressure before the water level inside falls to the lower limit water level LWL. When the pressure switch 4 detects this lower limit pressure, the pump 1 starts operating. Simultaneously with the start of the pump 1, the first gate valve 12 closes, and the second gate valve 12 closes.
gate valve 13 opens. This state is shown in FIG. At this time, since one end 5a of the water supply pipe 5 is below the water surface of the lower limit water level LWL'', the water in the pressure tank 3 is forcefully pushed through the water supply pipe 5 into the low pressure air supply tank 7, and the air supply tank 7 Since the water supply pipe 5 is filled with water, the pressure tank 3 and the air supply tank 7 are in communication with each other through water.Therefore, the pressure inside the air supply tank 7 is lower than that of the pressure tank. 3. This will be explained in more detail.

Now, assume that the water level in the air supply tank 7 is AL, the water level in the pressure tank 3 is LWL'', the difference between these water levels is H, and the head difference between the water level LWL'' in the pressure tank 3 and the air supply pipe 8 is h. If the pressure inside the pressure tank 3 is Pl, and the pressure inside the air supply tank 7 is PlAl, then the pressure PlA inside the air supply tank 7 is expressed by the following equation (1). k: Constant Next, let Pl be the pressure on the pressure tank 3 side of the check valve 9. This pressure Pl is expressed by the following equation (2).

Therefore, by subtracting equation (2) from (1), we get the following (3
). PlA-PlS=k(H-h)
-(3) As is clear from equation (3), the pressure before and after the check valve 9 is the head difference between the pressure tank 3 side position of the check valve 9 and the water level of the air supply tank 7, that is, the water level difference (H -h) The air supply side is higher than the pressure tank 3 side.

Therefore, the air compressed in the air supply tank 7 passes through the check valve 9 and is supplied to the pressure tank 3 side.

Of course, as the replenishment progresses and the water level difference between the pressure tank 3 and the air replenishment tank 7 becomes smaller, the air replenishment action becomes more gradual.

When the pump 1 continues to operate and the pressure in the pressure tank 3 reaches the upper limit pressure, the pump 1 stops. At the same time, the first gate valve 12 opens and the second gate valve 13 closes, so the water that has flowed into the air supply tank 7 is drained through the drain pipe 11, and fresh outside air is left in the air supply tank 7. is air intake valve 10
be taken in more. By repeating such operations, air is replenished into the pressure tank 3. Next, the operation when more air than necessary is replenished into the pressure tank 3 will be explained based on FIG. 3. If water continues to be supplied while the pump 1 is stopped, the water level and pressure in the pressure tank 3 will gradually decrease. If the air in the pressure tank 3 exceeds the appropriate amount and the pressure in the pressure tank 3 reaches the lower limit pressure, the water surface has already passed the desired lower limit water level LWL due to the excess air, and from this point onwards. It has been pushed down to the lower water level LWL″″. Therefore, one end 5a of the water supply pipe 5 opens to the air portion 6, and when the first gate valve 12 closes and the second gate valve 13 opens with the start of the pump 1, pressure is applied to the water supply pipe 5. Compressed air in the tank 3 flows into it. Then, the pressures in the pressure tank 3 and the air supply tank 7 become equal. When the pump 1 continues to operate and the water level in the pressure tank 3 rises, and one end 5a of the water supply pipe 5 is submerged, the water supply pipe 5
The water in the pressure tank 3 is also gradually pushed in. However, a considerable time delay occurs for the water in the pressure tank 3 to flow over the top 5b of the water supply pipe 5 and into the air supply tank 7 while further compressing the compressed air in the water supply pipe 5. Therefore, during the normal continuous operation time of the pump 1, it is not possible to replenish all of the outside air taken into the air replenishment tank 7 into the pressure tank 3, and the pressure inside the pressure tank 3 reaches the upper limit pressure. , leaving compressed air in the air supply tank 7. When the pump 1 is stopped, the first gate valve 12 is opened, and the second gate valve 13 is closed, the compressed air and water remaining in the air supply tank 7 are discharged through the drain pipe 11. When this operation is repeated, the excess air 6 in the pressure tank 3 is gradually discharged. By repeating such operations and constantly replenishing the pressure tank 3 with an appropriate amount of air, the water level in the pressure tank 3 is maintained at approximately the lower limit water level LWL. In the embodiment described above, the water supply pipe 5, the air supply tank 7, etc. can be fixed to the outer wall of the pressure tank 3.

Furthermore, in the embodiment described above, the top 5b of the inverted U-shaped water supply pipe 5 was raised almost to the upper limit water level HWL as shown in the figure, but the height of the top 5b was determined depending on the operating conditions of the pump 1. You can choose to. In addition, when the pressure tank 3 is excessively replenished with air, in order to delay the flow of water into the air replenishment tank 7 and ensure that the excess air is discharged, it is necessary to It is advantageous to have a long pipe line on the tank 3 side. This includes the top 5
The water supply pipe 5 disposed closer to the pressure tank 3 than b can be configured in a spiral shape, or the water supply pipe 5 can be formed with a gentle slope and wrapped around the outer wall of the pressure tank 3 to make the pipe longer. Furthermore, the embodiment includes first and second gate valves 1.
2 and 13 are opened and closed in synchronization with the operation of the pump 1. However, in this case, the first and second gate valves 12 and 13 are configured to be alternately opened and closed at regular intervals. almost the same results can be obtained. [Effects of the Invention] As is clear from the above description, the present invention provides a water supply pipe for flowing water in a pressure tank into an air supply tank, by connecting one end of the water supply pipe to a desired lower limit water level of the pressure tank, and The upper part is lifted upward to form an inverted U-shape, and the other end is connected to the lower part of the air supply tank, which prevents the water supply pipe from being filled with compressed air when there is excess air in the pressure tank. This delays the air replenishment operation and makes it difficult for air to be replenished from the air replenishment tank to the pressure tank.

Therefore, according to the present invention, it is possible to maintain an appropriate amount of air in the pressure tank with an extremely simple component configuration.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining one embodiment of the present invention;
FIGS. 2 and 3 are diagrams for explaining the invention in detail. 1 is a pump, 2 is a water supply pipe, 3 is a pressure tank, 5 is a water supply pipe, 5a is one end of the water supply pipe, 5b is the top, 5c is the other end of the water supply pipe, 6 is an air portion, 7 is an air supply tank, 8 is an air supply pipe, 9 is a check valve, 10 is an air intake valve, 11 is a drain pipe,
12 is a first gate valve, and 13 is a second gate valve.

Claims (1)

[Claims] 1. A pump, a pressure tank connected to the water supply pipe of this pump, an air supply tank connected to this pressure tank by a water supply pipe and an air supply pipe, and an air supply tank connected to the air supply pipe and supplied with water from the pressure tank side. Alternatively, a check valve that prevents air from flowing in, a drain pipe connected below the air supply tank, a first gate valve connected to the drain pipe, and a first gate valve provided in the water supply pipe. The water supply pipe has one end connected to a desired lower limit water level of the pressure tank, and a second gate valve that opens when the tank is closed, and an air intake valve connected to the upper part of the air supply tank. is raised above the connection point of the water supply pipe to the pressure tank to form an inverted U shape, the top of the inverted U shape is located near the desired upper limit water level of the pressure tank, and the other end is connected to the air supply tank. A water supply device characterized by being connected below the.