JPS6014944Y2 - Auto stop pump - Google Patents

Description

[Detailed explanation of the invention] This invention uses an extremely sensitive response means to instantly stop the pump when suction is completed in a pump used to suck up bilge or engine oil accumulated in the engine room, etc. Concerning a structure devised to be made.

As is well known, bilge accumulates on small fishing boats, motor boats, etc., and bilge pumps are used as a countermeasure against this problem. Conventionally, this type of pump generally continues to operate even after suction is completed unless the hand switch is turned off. Therefore, these factors are not known and the pump is often operated idly, which may damage the pump and is not desirable in terms of service life.

This idea was devised to solve the above problem, and its purpose was to eliminate dry running and improve the durability of the pump, and in particular, to improve the durability of the pump by introducing a diaphragm that responds to the stop switch to stop the pump. To provide an auto-stop type pump which is devised so that the pumps react sharply to internal water flow pressure and stop the pumps almost simultaneously.

The specific examples shown in the drawings will be described below.

The drawing shows an example of a pump that is primarily used for draining bilges, changing engine oil, etc., but can also be used for cleaning decks and watering gardens as needed.
The pump is rotationally driven by a drive device (not shown).

In the figure, reference numeral 1 denotes a pump body with a double structure, and a vane body 2 that rotates in the direction of arrow R is installed inside the body 1, and the vane body 2 is attached to an offset cam 3 protruding from the inner circumference of the body 1. It bends accordingly and performs a pumping operation.

4 is a suction side pipe joint connected to the main body 1 to connect a suction pipe with a strainer (not shown), and 5 is a suction side pipe joint connected to the main body 1 to connect a discharge pipe with a water discharging piece (not shown). This is a discharge side pipe joint.

A discharge passage 6 communicating from the pump chamber to the discharge side pipe joint 5 is formed in the main body 1 .

An enlarged portion 7 and a constricted portion 8 are successively provided in this order along the flow direction in the middle of the discharge path 6.

In the case of this embodiment, the inner hole at the base of the discharge side pipe joint 5 is formed to have a small diameter to form the constricted portion 8 .

A cylindrical protrusion 9 is provided that protrudes from the opening periphery of the aperture portion 8 toward the enlarged portion 7.

This cylindrical protrusion 9 is formed at the end of the discharge side pipe joint 5.

A predetermined space 10 is formed on the outer circumferential surface of the cylindrical protrusion 9 and on the inner surface of the circumferential wall of the enlarged portion 7.

Note that it is desirable that the outer circumferential surface of the cylindrical protrusion 9 be formed into a tapered shape.

A pressure extraction pipe 13 is connected to the wall of the enlarged portion 7.

This pressure take-off pipe 13 is formed in the shape of a flange, and an inner passage 12 communicating with the enlarged portion 7 is formed therein.

A diaphragm 11 is attached to the flange end of the flange-shaped pressure outlet pipe 13, and the diaphragm 11 covers the inner passage 12 in a watertight manner.

A rubber expansion/contraction plate 11a is attached to the outer surface of the diaphragm 11 so as to be movable forward and backward by a deformed portion a on the outer periphery.

A pressure switch 15 is attached to the flange surface of the pressure outlet pipe 13.

This pressure switch 15 is in contact with the expansion/contraction plate 11a via the cylinder 14.

That is, the pressure switch 1 is
5 is activated.

The pressure switch 15 is electrically connected to a drive device (not shown) and is configured to detect a drop in pressure in the enlarged portion 7 and disconnect the drive device.

Therefore, in the above configuration, when the pump is started by the push button switch, the pressure in the enlarged part 7 is increased by the throttle part 8 on the discharge side, and the pressure in the diaphragm 11 is accordingly increased, which simultaneously turns on the switch 15 and starts the pump. Even if the button is released, pumping continues, and when the suction is completed and the pump reaches an empty state, the internal pressure drops and the diaphragm 11 turns off the switch 15, so that the pumping is stopped.

When fluid flows from inside the enlarged part 7 to the tightened part 8 in the Mini, the opening periphery of the tightened part 8 is formed into a cylindrical protruding part 9 that projects into the enlarged part 7, so compared to the case where the pipe path is simply narrowed, The conduit loss coefficient becomes extremely large, and the throttling effect becomes significant.

Therefore, the pressure rise in the enlarged portion becomes larger than that in the case where the diameter of the pipe is simply narrowed.

On the other hand, when the flow of the bilge ceases, the above-mentioned pressurized state is rapidly dissolved, and this large pressure difference causes the diaphragm 11
is reliably moved backward, and the switch 15 is turned OFF to stop the pump.

This idea is as described above, and since there is a place in the discharge passage where the pressure is locally increased, when the water flow is completed, the pressure returns from a considerably high pressure state to zero, and this is used to quickly turn the switch. Since the pump is responsive, the pump can be stopped quickly and accurately.

Moreover, it is more effective because it is done through the discharge side.
Another advantage is that it can be implemented at low cost with an extremely simple structure.

In particular, if the tip of the discharge side pipe joint 5 is processed to form the cylindrical protrusion 9, the joint 5 can be attached and detached freely, so that the empty space 1
Even if the 0 is clogged with water scale or other foreign matter, it can be easily removed.

[Brief explanation of drawings]

The figure is a partially sectional front view of a pump showing an example of this invention. DESCRIPTION OF SYMBOLS 1... Pump body, 5... Discharge side pipe joint, 6° 7... Discharge path, 9... Cylindrical protrusion, 10... ... Blank space, 11 ... Diaphragm, 15 ... Pump stop switch.

Claims (1)

[Scope of utility model registration request] An enlarged part and a throttle part are arranged in this order along the flow direction in the middle of the discharge path of a pump rotated by a drive device, and a cylindrical protrusion projects from the opening periphery of the throttle part toward the enlarged part. A pressure take-off pipe is connected to the enlarged part, and a diaphragm pressure switch is connected to the pressure take-off pipe, and the driving device is disconnected by detecting a pressure drop in the pressure switch. This is an auto-stop type pump.