JPS5857640B2 - pump equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent the pump from chattering even when the water faucet is used with the tap closed.

In order to achieve this objective, the present invention provides a bypass passage in parallel with an on-off valve that is pushed open by water pressure when the hydrant is opened, and in which the flow of water stops only when the hydrant is almost completely closed. , a thermistor is provided in the bypass passage to control the operation of the pump.

With this configuration, when the water supply faucet is closed, water no longer flows into the bypass passage, the temperature of the thermistor rises, and the resistance changes, thereby stopping the operation of the pump.

Therefore, no chattering occurs even when the faucet is turned off.

The present invention will be explained below with reference to the drawings. 1 is a pump, its suction pipe 2 is connected to a water source such as a well, and its discharge pipe 3 is connected to a faucet 6 at its tip via an on-off valve 4 and a water tap 5. ing.

The on-off valve 4 is always urged in the closing direction by a spring 7 and opened by water pressure.

A bypass passage 8 connects the upstream side and the downstream side of the on-off valve 4, and a positive temperature coefficient thermistor 9 is provided in this bypass passage, and a pressure tank 10 is connected thereto.

This pressure tank (to which the pressure switch 11 is connected)
The contacts of this pressure switch 11 are designed to close when the air pressure in the pressure tank 10 becomes low.

Although the thermistor 9 was provided in the bypass passage 8,
It may be attached to the outer surface of the bypass passage to avoid an increase in water flow resistance.

However, in this case, the bypass passage must be made of a metal with good thermal conductivity so as not to inhibit the cooling effect of the thermistor 9 by the water flowing in the bypass passage.

FIG. 2 shows a prosthetic air circuit, in which the thermistor 9 and the pressure switch 11 are connected in parallel, and the parallel circuit is connected in series with a relay 12, and the contact 13, which is closed when the relay is energized, is connected to the pump motor 14. connected in series.

In the above configuration, when the water tap 5 is opened, the pressure tank 10
As the internal pressure decreases, the contacts of the pressure switch 11 close, current flows through the relay 12 and closes the contacts 13, the pump motor 14 rotates and the pump 1 starts operating, and the water discharged from the pump is The on-off valve 4 is pushed open and the water is supplied to the faucet 6.

When the faucet 5 is turned down, the water flow becomes weaker and the on-off valve 1
4 is closed by the force of spring 7.

Even if the on-off valve 4 is closed, unless the water tap 5 is completely closed, water will flow into the bypass passage 8 and the positive temperature coefficient thermistor 9 will flow.
is being cooled.

Therefore, this thermistor has a small resistance value, and even if the pressure in the pressure tank 10 increases and the pressure tank inch 11 opens by closing the water tap, the resistance value is small.
Current continues to flow through the J relay 12, and the pump motor 14 continues to rotate.

Therefore, even if the faucet 5 is used in a closed state, chucking will not occur in the relay.

When the faucet 5 is completely shut off, water no longer flows into the bypass passage 8, so that the positive temperature coefficient thermistor 9 cannot be cooled, and the resistance of the thermistor 9 increases due to self-heating.

On the other hand, since the pressure in the pressure tank 10 is also high, the pressure switch 11 opens its contacts, and as a result, no current flows to the relay 12, and the contacts 13 are opened to stop the pump motor 14.

As described above, the present invention cools the thermistor 9 as long as water is flowing through the bypass passage 8 even when the water tap 5 is closed, and maintains the same resistance value as when the water tap is fully open. Chattering does not occur when operation is continued, and durability can be increased.

Note that the pump is started by the pressure switch 11, but this pressure switch may be of a conventionally used type; only the thermistor 9 is required to carry out the present invention, which is economical. be.

[Brief explanation of the drawing]

FIG. 1 is a hydrographic diagram of the pump device of the present invention, and FIG. 2 is an electric circuit diagram. 5... Water tap, 4... Open/close valve, 8...
...Bypass passage, 9...Thermis Ku 11
・・・・・・Pressure switch, 12・・・・・・Relay,
14...Pump motor.

Claims (1)

[Claims] 1. An on-off valve that is pushed open by water pressure when a hydrant is opened, a bypass passage that connects the upstream and downstream sides of the on-off valve, and a system that is cooled by water flowing through the bypass passage. It is equipped with a thermistor and a pressure switch that opens and closes by detecting the pressure of the discharge side waterway, and when the water faucet is opened, the pump is activated by the operation of the pressure switch, and when the faucet is closed, the resistance change due to temperature change of the thermistor is activated. A pump device characterized in that the pump is stopped by: 2. The pump device according to claim 1, wherein the thermistor has a positive characteristic of increasing resistance as the temperature rises, and the pressure switch closes its contacts as the pressure decreases. 3. The pump device according to claim 1 or 2, wherein the thermistor and the pressure switch are connected in parallel, and this parallel circuit is connected in series with a relay for pump operation.