JPS588292A - Self-suction type centrifugal pump - Google Patents

Abstract

PURPOSE:To suppress wear of a vacuum pump and thereby eliminate wasteful use of the power by keeping away the air with a vacuum pump, in case when the air existing in the centrifugal pump hinders pumping-up, and by shutting off the drive of vacuum pump after the centrifugal pump is put in operation. CONSTITUTION:In case no water exists in the pump chamber 2 at the time of starting the pump, the revolving drive shaft 4 rotates the rotor 6 of the vacuum pump 5 to permit the blade plate 16 to rotate incontact with the internal surface of the casing 17, which will suck the air out of the pump chamber 2 through a communication pipe 14 into the flowout pipe 12, whereby inside of the pump chamber 2 will become in negative pressure to pump up the water for filling the pump chamber 2. Then the centrifugal pump 1 is put in operation to suck up the water, which flows out to the flowout pipe 12 through a check valve 13. Thus the water pressure in the pump chamber 2 rises, and this water at high pressure is sent to the clutch chamber 7 through a communication pipe 10 to push the clutch 8 in the direction of disengagement, which will decouple the drive shaft 4 to stop the rotor 6 and thereby the vacuum pump 5 also, so that wear of the vacuum pump 5 can be suppressed and wasteful use of the power, eliminated.

Description

[Detailed description of the invention] The self-priming centrifugal pump of this invention is a centrifugal pump.

If air is present in the pump and cannot be sucked up, the air is removed by the vacuum pump, and after the centrifugal pump has started operating, the vacuum pump is cut off to avoid wear on the rotating parts of the vacuum pump and waste of power. That is, the drive of the vacuum pump that bypasses the centrifugal pump is released by the water pressure of the centrifugal pump.

A centrifugal pump and a vacuum pump are coaxially connected, both flow paths are connected in parallel, and the rotor of the vacuum pump is moved from an eccentric position to a concentric position of the casing by the water pressure of the centrifugal pump.
There is a centrifugal pump that is designed to reduce the driving force of the vacuum pump after the centrifugal pump operates (Utility Model Publication No. 35-20372).
However, since the blades continue to rotate in contact with the casing, wear is unavoidable.

The centrifugal pump of this invention eliminates the above-mentioned drawbacks. Next, referring to the drawings, the pump chamber 2 of the centrifugal pump 1
The rotor 6 of the vacuum pump 50 is connected to the drive shaft 4 of the impeller 3 inside via the clutch 8 inside the clutch chamber 7, and the high pressure side of the pump chamber 2 and the inflow pipe 9 are connected to the coupling side of the clutch 8 and The connecting pipes 10 and 11 are connected to the detachment side, respectively.

A check valve 13 is provided to the outflow pipe 12, and the check valve 1 of the outflow pipe 12
In all cases, the outflow side and the pump chamber 2 are connected via a vacuum pump 5 and a connecting pipe 14.

Next, to explain the operation when there is no water in the pump chamber 2 when starting the pump, when the motor 15 is energized, the rotation of the drive shaft 4 causes the rotor 6 of the vacuum pump 5 to When the pump rotates, the impeller 3 of the centrifugal pump 1 also rotates, but since there is no water in the pump chamber 2, the centrifugal pump 1 does not suck up any water.

As the rotational pressure of the rotor 6 of the vacuum pump 5 increases, the vane plate 16 rotates while contacting the inner surface of the casing 17, sucking out the air in the pump chamber 2 through the connecting pipe 14 and releasing it into the outflow pipe 12. Since the inside is depressurized, water is sucked up and fills the pump chamber 2.

Then, the centrifugal pump 1 operates and sucks up water, and the water flows through the check valve 1.
3 to the outflow pipe 12.

Then, the water pressure inside the pump chamber 2 rises and becomes this high.

The pressurized water reaches the clutch chamber 7 through the connecting pipe IO and pushes the clutch 8 in the direction of disengagement, so the clutch 8 retreats against the spring 18 and disengages, and the drive shaft 4 is uncoupled, so the rotor 6
stops.

This invention is a centrifugal pump that uses a vacuum pump to remove air when there is no water in the pump chamber, and sucks up water by the resulting depressurization. Avoiding pump wear and wasting power.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a centrifugal pump of the present invention, and FIG. 2 is a longitudinal sectional view of the vacuum pump. 1: Centrifugal pump 2: Pump chamber 3: Impeller 4: Drive shaft 5: Vacuum pump 6: Rotor 7: Clutch chamber 8: Crate 9: Inflow pipe 10, 11, 14: Connecting pipe 12:
Outflow pipe 13: Check valve inventor Hiyoshi Tatsuno Applicant Tokyo Tack Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A self-priming centrifugal pump that uses the water pressure of the centrifugal pump to release the drive of the vacuum pump that bypasses the centrifugal pump.