JPS6244118B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic operating device that is capable of continuous operation even when the water faucet is turned off.

Conventionally, in order to enable continuous operation even when the faucet is turned off, a pressure switch 1 is used as shown in Figure 1.
There is one in which the flow rate switch 2 and the flow rate switch 2 are connected in parallel. With this kind of connection, when the water faucet is opened, the pressure on the discharge side of the pump decreases, so turn on the pressure switch 1.
is closed and the pump motor 3 is energized to start operation. When the pump operates, water flows, so the flow rate switch 2 also closes its contacts. When the water faucet is closed to reduce the flow rate, the pressure on the discharge side of the pump increases and the pressure switch 1 opens, but since the flow rate switch 2 is closed, current continues to flow to the pump motor 3, and the pump continues to operate. When the faucet is almost completely shut off, there is no flow of water, so the flow rate switch 2 is opened and the pump motor 3 is stopped. Therefore, if pressure switch 1 and flow rate switch 2 are connected in parallel, the pump will operate continuously until the faucet is almost completely shut off, so the switch will not chattering even when the flow rate is low, improving durability. can be increased.

However, since it is economically disadvantageous to use two switches, a pressure switch and a flow rate switch, the present invention attempts to combine these two switches into one switch.

To achieve this objective, the present invention includes a reed switch that controls the operation of the pump, and a float that is kept pushed up by a water flow during operation to keep the magnet close to the reed switch. , a water pressure sensing body that is actuated to push up the float by detecting a pressure drop in the waterway due to opening of the water faucet at the start of operation. Therefore, when the water faucet is opened and the pressure in the waterway decreases, the water pressure sensor detects this and pushes up the float, and the magnet provided on the float approaches the reed switch and closes the contact of this switch. Rotate the pump motor. When the water faucet is closed during operation, the pressure in the water channel increases, and the water pressure sensor loses its force pushing up the float, but the float is kept pushed up by the water flow, so the pump motor continues to rotate. Continue. When the faucet is almost completely shut off, there is no flow of water, so the float descends under its own weight, the reed switch opens the contact, and the pump motor stops. Therefore, even if there is only one switch, chattering can be prevented.

The present invention will be explained below based on FIG. 2 and subsequent figures.
Reference numeral 4 denotes a switch device connected between the discharge side of the pump and the water faucet. The inflow side passage 5 and the outflow side passage 6 are in communication with each other via a bored communication hole 8. The communication hole 8 is provided in the upper wall of the outflow side passage 6.
A through hole 9 is bored at a position opposite to the hole 9, and the through hole is closed by a cover plate 10. A guide pin 11 is inserted from this cover plate toward the center of the communication hole 8.
is installed vertically, and a float 12 is fitted to the guide pin so as to be vertically movable. A permanent magnet 13 is embedded in the upper surface of this float, and a plurality of ribs 14, 14, . . . are vertically provided in the lower surface. Further, an opening is provided in the lower wall of the inflow side passage 5 at a position opposite to the communication hole 8, and a water pressure detection body 15 made of a bellows is attached to the opening, and the water pressure detection body is connected to the communication hole 8. O-ring 1
6 and is held down by a cap 17. Reference numeral 18 denotes a spring for applying a force to the water pressure sensing body 15 in the direction of extension. Although the strength of the spring 18 cannot be adjusted in this embodiment, it may be adjusted from the outside using a screw mechanism.
Reference numeral 19 denotes a stopper provided radially around the periphery of the communication hole 8. When the water pressure sensing element 15 extends, it hits this stopper 19 and prevents it from elongating any further. Even when the stoppers 19 are extended, the communication hole 8 is not blocked, and water can flow through the communication hole 8 from between the stoppers 19, 19... Note that when the water pressure sensing body 15 extends and hits the stopper 19, this water pressure sensing body comes into contact with the ribs 14, 14, . It's becoming like that. A reed switch 20 is mounted on the top surface of the cover plate 10, and when the top surface of the float 12 approaches the cover plate 10, the contact is closed by the magnetic force of the magnet 13 installed inside the float.

FIG. 3 is an electrical circuit diagram of the reed switch 2.
0 is connected in series with a relay coil 21, and when the relay coil is energized, a relay contact 23 connected in series with the pump motor 22 is closed.

The operation of the above configuration will be explained below. First, when the faucet is opened, the pressure on the discharge side of the pump decreases, so the force of the spring 18 causes the water pressure sensor 15 to
extends until it hits the stoppers 19, 19, . . . and pushes up the float 12. (Fig. 2A) As a result, the upper surface of the float comes into approximate contact with the cover plate 10, and the reed switch 2 is activated by the magnet 13 installed inside the float.
Close 0. When the reed switch closes, the relay coil 21 is energized, the relay contact 23 is closed, current flows to the pump motor 22, and the pump starts operating. When the water faucet is slightly tightened while the pump is running, the pressure on the discharge side of the pump increases, causing the water pressure sensor 15 to contract, but since water is flowing, the float 12 is pushed up by the water pressure, and the lead The switch 20 remains closed. (Figure 2B) When the faucet is completely shut off, the pressure on the discharge side of the pump increases further, so the water pressure detector 15 further contracts, and since water no longer flows, the float 12 descends under its own weight. Thereby, magnet 1
3 moves away from the reed switch 20, the reed switch opens the contact, cuts off the power to the relay coil 21, opens the relay contact 23, cuts off the power to the pump motor 22, and stops the operation.

In this manner, the present invention allows the pump to be operated continuously until the faucet is almost completely shut off.

As described above, the present invention allows the water faucet to be operated continuously until it is almost completely shut off, so there is little variation in the pressure on the discharge side of the pump, making it particularly valuable as a water source for water heaters, etc., and also preventing the chattering of the switch. durability is increased. Furthermore, by simply providing a float holding a reed switch actuating magnet and a water pressure detector that pushes up the float,
Both a drop in water pressure and a loss of flow can be detected with just one reed switch, thus simplifying the device with fewer components.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a conventional automatic driving device, FIGS. 2A, 2B, and 2 are explanatory diagrams of the operation of the automatic driving device of the present invention, and FIG. 3 is an electric circuit diagram. 22...Pump motor, 20...Reed switch, 13...Magnet, 12...Float, 15...
Water pressure sensing body.

Claims (1)

[Claims] 1. A reed switch that controls the operation of the pump;
A float that has a magnet that activates the reed switch and is kept pushed up by the water flow during operation to keep the magnet close to the reed switch, and detects a pressure drop in the waterway at the start of operation. An automatic operation device for a pump comprising a water pressure sensing body that operates to push up the float. 2. The automatic operation device for a pump according to claim 1, wherein the water pressure sensing body is pushed by a spring in the direction of pushing up the float. 3. The automatic operation device for a pump according to claim 2, wherein the water pressure sensing body is constituted by a bellows.