JP2563387B2 - Automatic water supply - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic water supply device for supplying water stored in a water tank or the like.

2. Description of the Related Art A conventional example of an automatic water supply device will be described below with reference to FIG.

In FIG. 3, reference numeral 1 is a pump, and a suction port 2 communicates with a water storage tank 3. A check valve 4 is provided at the discharge port of the pump 1, and a pressure switch 5 and a pressure accumulator tank 6 are provided downstream of the check valve 4. Further, a diaphragm 8 is provided via a passage 7 so as to receive the pressure on the upstream side and the downstream side of the check valve 4. The diaphragm 8 is urged by a spring 9 in the upstream direction of the check valve 4, and a magnet 10 is attached to the diaphragm 8. A magnet switch 11 is turned off when the magnet 10 approaches, and turned on when the magnet 10 moves away. Reference numeral 12 is a control device, which uses the output signals of the pressure switch 5 and magnet switch 11 to pump
It controls the drive motor of. Reference numeral 13 is a faucet communicating with the downstream side of the check valve 4.

The conventional automatic water absorption device configured as described above has a faucet 13
When the valve is opened, the pressure in the pipeline decreases, the pressure switch 5 is turned on, and the control device activates the drive motor of the pump 1.

When the faucet 13 is wide open, the pressure in the pipeline does not become too high even when the pump 1 is operating, and the pressure switch 5 does not turn off. However, when the faucet 13 is small open, the faucet 13 In some cases, the amount of water discharged from the pump 1 is larger than the amount of water discharged from the pump 1. In this case, the pressure in the pipeline gradually increases and the pressure switch 5 is turned off. However, in this case, due to the flow of water in the pipeline, the fluid resistance of the check valve 4 causes a pressure difference before and after the check valve 4, and the diaphragm 8 resists the spring 9 due to this pressure difference. 4 will be in the state of being shifted to the downstream side. As a result, the magnet switch 11 is turned on, and the control device 12 puts the pump 1 into an operating state. When the faucet 13 is completely closed during the operation of the pump 1, the pressure in the pipeline gradually rises, the pressure switch 5 is turned off, and the water flow in the pipeline is stopped, so that the pressure difference before and after the check valve 4 also disappears. The diaphragm 8 shifts to the upstream side of the check valve 4 and the magnet switch 11 is turned off. As a result, the control device 12 stops the operation of the pump 1.

Problems to be Solved by the Invention When a faucet connected to a pipeline is suddenly closed, a shock wave may be generated in the pipeline. Further, in particular, the fully automatic washing machine has an electromagnetic valve, and the electromagnetic valve is frequently opened and closed. Therefore, if the fully automatic washing machine is connected to the pipeline, a shock wave may frequently be generated in the pipeline.

In the conventional automatic water supply device, the shock wave generated in this way is transmitted to the diaphragm 8 and the diaphragm 8 may be damaged. Further, when one of the faucets in the automatic water supply device is rapidly closed while supplying water to two or more faucets and a shock wave is generated, the diaphragm may be displaced by the shock wave and the operation of the pump may be temporarily stopped. In such a case, the pressure in the water supply line is suddenly and suddenly lowered, and for example, when an instantaneous water heater is used, the temperature of the hot water changes and there is an inconvenience.

Means for Solving the Problems In order to solve the above problems, an automatic water supply device of the present invention includes a first check valve communicating with an outlet of a pump and a downstream side of the first check valve. A pressure switch is provided, a passage bypassing the first check valve is provided, and a second check valve and a flow switch for detecting the water flow in the passage are sequentially provided in the passage from the upstream side, and the discharge pressure is specified by the pressure switch. If the automatic water supply system is equipped with a control device that activates the pump when it detects that the pressure is less than the specified pressure, or when the flow switch detects that the water flow in the passage exceeds a specific water flow, the flow switch has an internal A mover is provided through the gap, and when the mover moves to the downstream side by the water flow, the flow switch is turned on, and when the mover moves to the upstream side, the flow switch is turned off. , When the shock wave is generated on the downstream side, the flow switch can be kept on by the resistance of water until the second check valve is closed by the shock wave that has passed through the gap and the mover moves to the upstream side. The flow switch is not immediately turned off by a shock wave.

Action With the above-described means, in the automatic water supply apparatus of the present invention, when the shock wave is generated on the downstream side, the first check valve is closed by the shock wave. At the same time, the shock wave propagating in the passage passes through the gap of the slow switch, goes around behind the moving element, is caught by the second check valve, and the second check valve is also quickly closed. By providing the gap and the second check valve, the shock wave that wraps around behind the moving element is rapidly attenuated and disappears between the moving element and the second check valve without entering the pump side. However, until the second check valve is closed and the mover moves to the upstream side, the flow switch can be kept on by braking due to the resistance of water. Aside from the pressure switch being off, the pump does not stop while the flow switch is on, so
Since the second check valve and the first check valve are opened again in a short time, the pump does not stop due to the shock wave. And if there is no second check valve and the flow switch is off, the pump will stop, so if there is no second check valve, water will drop through the passage, but the second check valve will Because it is provided, it will not fall off.

Embodiment An embodiment of the automatic water supply device according to the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 is a pump, and a suction port 2 communicates with a water storage tank 3. Reference numeral 4 denotes a first check valve provided at the discharge port of the pump 1, and a pressure switch 5 and a pressure accumulator tank 6 are provided downstream of the first check valve 4. Reference numeral 14 is a passage that bypasses between the upstream side and the downstream side of the first check valve 4, and a second check valve 15 is provided in this passage 14. Further, the passage 14 is provided with a flow switch 16 which is turned on when the water flow flowing in the passage 14 is a specific value or more. As for the check valve 15 and the flow switch 16, the check valve 15 is provided on the upstream side, and the flow switch 16 is provided in order. Flow switch
Reference numeral 16 is a cylindrical mover 17 that is moved by the water flow in the passage 14.
And a shaft 18 inserted in the moving element 17,
A magnet is attached to the shaft and the shaft 18 has a built-in magnet switch. Then, when the mover 17 moves due to the water flow in the passage 14, the magnet switch is turned on.
In addition, a gap is provided between the mover 17 and the passage 14, and the mover 17 ascends against gravity when there is a specific amount of water flow in the passage. Reference numeral 12 is a control device, which is provided with a relay 19, and the pressure switch 5 and the flow switch 16 are connected in parallel to the coil of the relay 19. Further, the drive motor 20 of the pump 1 is connected to the power supply via the contact of the relay 19.

The operation of the automatic water supply system of the present embodiment configured as above will be described.

When the faucet 13 is opened, the pressure in the pipeline decreases, the pressure switch 5 turns on, the contact of the relay 19 of the control device 12 turns on, and the drive motor 20 of the pump 1 starts.

When the faucet 13 is wide open, the pressure in the pipeline does not become too high even when the pump 1 is operating, and the pressure switch 5 does not turn off. However, when the faucet 13 is small open, the faucet 13 In some cases, the amount of water discharged from the pump 1 is larger than the amount of water discharged from the pump 1. In this case, the pressure in the pipeline gradually increases and the pressure switch 5 is turned off. However, in this case, since there is a flow of water in the pipeline, the fluid resistance of the check valve 4 causes a pressure difference before and after the check valve 4, and this pressure difference causes a water flow in the passage 14. This water flow moves the mover 17 to the downstream side of the check valve 4.
This turns on the flow switch and the controller 12
Maintains the operating state of the pump 1. When the faucet 13 is completely closed during the operation of the pump 1, the pressure in the pipeline gradually rises, the pressure switch 5 is turned off, and the water flow in the pipeline is stopped, so that the pressure difference before and after the check valve 4 also disappears. As a result of gravity, the mover 17 moves to the upstream side of the check valve 4, and the flow switch 11 is turned off. As a result, the control device 12 stops the operation of the pump 1. When the faucet 13 is suddenly closed and a shock wave is generated on the downstream side, the shock wave closes the check valve 4 and travels through the passage 14 to reach the flow switch 16. Inside the flow switch 16, there is a moving element through a gap.
Since the shock wave 17 is provided, a part of the shock wave passes through the gap, but most of the shock wave is reflected by the moving element 17 and absorbed by the accumulator tank 6, while being rapidly attenuated between the moving element 17 and the accumulator tank 6 side. The shock wave that has passed through the gap is transmitted to the check valve 15 and
Close 15 The shock wave reflected by the check valve 15 is a moving element.
It rapidly decays between 17 and the check valve 15 and disappears, and the passage 14
The water flow inside is, so to speak, stopped. The mover 17 slowly descends to the upstream side by gravity while being braked by the resistance of water, so that the operation of the pump 1 is maintained for a while. It should be noted that the check valve 15 is easy to make the valve body strong, and is not damaged by the shock wave. Since both the check valve 4 and the check valve 15 are closed, the shock wave is generated on the main body side of the pump 1. It is not transmitted to and affected. If there is no gap and check valve 15, the mover 17 should move to the upstream side rapidly due to the action of the shock wave, and the flow switch 16 should be turned off. Stop valve 15
As long as the switch is closed, the flow switch 16 can be kept on until the mover 17 moves to the upstream side. Since the operation of the pump 1 is maintained for a while, the second check valve 15 opens again after the shock wave disappears, and the mover 17 rises before it completely descends. Therefore, the operation of the pump 1 should be stopped by the shock wave. There is no. The time until the check valve 15 is opened can be set by appropriately selecting the configuration of the flow switch 16. If the check valve 15 is not provided and the flow switch 16 is turned off, the pump 1 is stopped and water is dropped through the passage. However, since the check valve 15 is provided, water is not dropped.

EFFECTS OF THE INVENTION As described above, the automatic water supply apparatus of the present invention is provided with the passage bypassing the first check valve provided on the discharge side of the pump, and the passage of the second check valve and the water flow of the passage in the passage. A flow switch for detection is provided, and it operates according to the operating state of the pressure switch and the flow switch, and puts the pump into operation when the pressure at the outlet of the pump is below a specific pressure or when the water flow in the passage is above a specific water flow. Since the control device is provided, even if the faucet or the like is suddenly closed and a shock wave is generated, there is no portion to be damaged, and the pump does not temporarily stop due to the shock wave. In addition, the first and second check valves can prevent the shock wave from propagating to the pump side. Without the second check valve, the pump will stop when the flow switch is turned off and water will drop through the passage. This should not be the case with the second check valve. Then, by appropriately selecting the configurations of the mover, the gap, and the second check valve, the time until the second check valve is opened can be set.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of an automatic water supply device of the present invention, FIG. 2 is a wiring diagram thereof, and FIG. 3 is a sectional view of an essential part of a conventional automatic water supply device. 1 ... Pump, 3 ... Water tank, 4 ... First check valve 5 ... Pressure switch, 6 ... Accumulator tank 12 ... Control device, 13 ... Faucet, 14 ... Passage 15 ... 2 Check valve, 16 …… Flow switch 17 …… Motor, 19 …… Relay, 20 …… Motor

Claims (1)

(57) [Claims] 1. A first check valve communicating with a discharge port of a pump, a pressure switch provided downstream of the first check valve, and a passage bypassing the first check valve. A second check valve and a flow switch for detecting the water flow in the passage are sequentially provided in the passage from the upstream side, and the pressure switch detects that the pressure at the outlet is equal to or lower than a specific pressure, or In an automatic water supply device provided with a control device that puts the pump into an operating state when the flow switch detects that the water flow in the passage is a specific water flow or more, in the flow switch, a mover is provided inside through a gap. The moving element is configured to turn on the flow switch when moving to the downstream side due to the water flow and turn off the flow switch when shifting to the upstream side. When it occurs on the flow side, the flow switch can be kept on by the resistance of water until the second check valve is closed by the shock wave that has passed through the gap and the mover moves to the upstream side. The automatic water supply device characterized in that the flow switch is not immediately turned off by the shock wave.