JPS5842633Y2 - Self-priming axial pump - Google Patents

Description

[Detailed description of the invention] This invention relates to an axial flow pump having a self-priming action.

Axial flow pumps are suitable for large volumes of water and low head, and can be operated with much lower power than centrifugal pumps. Their structure is simple and there are fewer troubles. The impeller has a simple shape, so the impeller can be made stronger. It has various advantages.

However, when starting up conventional axial flow pumps, it is necessary to evacuate the inside of the casing using a vacuum pump to pump water, which poses a problem in that it takes more time to pump water than with self-priming centrifugal pumps.

In order to solve the above-mentioned problems, this invention provides a self-priming axial-flow pump in which the axial-flow pump mechanism is installed in a pump casing having a water-air separation chamber to perform a self-priming action. .

Embodiments of this invention will be described in detail below with reference to the accompanying drawings.

As shown in the figure, 1 is a pump casing with a discharge port 2 at its upper end, a suction port 3 near the top of the front wall, and a check valve 4 made of rubber or the like inside this suction port 3. is installed to prevent water in the casing 1 from flowing out from the suction port 3.

In addition, the lower part of the rear wall of the pump casing 1 is opened, and a cover 5, which is a part of the rear wall of the casing 1, is fixed to this opening, and the ubiquitous bearing foot and shaft sealing device are installed in the center of the cover 5. A horizontal rotating shaft 6 is attached through the shaft, and an axial flow type impeller T is fixed to the inner end of this shaft 6.

8 is a cylindrical peripheral wall surrounding the outside of the impeller 7;
and the suction port 3 are integrally communicated through a smoothly bent bent pipe 9.

The rear end of the peripheral wall 8 becomes an opening 10, and a cover 5 as a part of the rear wall of the casing 1 faces the opening 10.
An annular water conduit 11 with a semi-circular cross section is formed inside the opening 10 for reversing the water discharged from the opening 10 outward, and a semicircular water conduit 11 is formed on the outside of the rear end of the peripheral wall 8, which is the outer periphery of the opening 10. A molded ring 12 having a cross section is integrally formed, and a plurality of guide plates 13 are provided in the water conduit 11.

Further, the lower part of the pump casing 1 is a steam/water separation chamber 14 surrounding the bent pipe 9 and the peripheral wall 8, and the upper part of this chamber 14 is provided with a steam/water separation wall 15.

The separation wall 15 is curved in an arc shape as shown in FIG. 2, and has a downwardly facing piece 16 at the right end in FIG. 2 so as to receive water splashed by the rotation of the impeller T in the direction of the arrow.

Further, although the front and rear ends of this separation wall 15 are in contact with the side walls of the casing 1 as shown in FIG. 1, sufficient gaps are provided between both ends and the casing as shown in FIG. 2.

The pump of this invention has the above-mentioned configuration, and the air-water separation chamber 14
When the rotary shaft 6 is driven by a motor or the like under the condition that water exists from 1 to 4 near the check valve 4, the water entering the curved pipe 9 from the surrounding wall 8 is moved by the impeller 7 to the annular water conduit 11.
There, the water is reversed and sent to the steam/water separation chamber 14.

The water thus sent out to the steam/water separation chamber 14 hits the steam/water separation wall 15 and is prevented from moving toward the discharge port 2, and accumulates in the steam/water separation chamber 14, and the air contained in this amount of water becomes bubbles. The liquid then separates and floats up, and is discharged into the atmosphere from the upper discharge port 2 through a discharge pipe (not shown).

A part of the water from which the air has been separated in the steam/water separation chamber 14 returns to the bent pipe 9 through the gap between the outer periphery of the impeller T and the inner periphery of the peripheral wall 8, and is returned to the bent pipe 9 by the stirring action of the impeller 7. The air and water in 9 are mixed, and the impeller 7 repeats the circulation in which the air and water flow through the opening 10 through the annular conduit 11 and into the steam/water separation chamber 14.

By repeating the water circulation as described above, the air inside the lift pipe connected to the button inside the curved pipe 9 and the suction port 3 is gradually discharged, so the air pressure inside the lift pipe and inside the curved pipe 9 gradually decreases. Eventually, water will be sucked up and pumping will begin.

When the rotating shaft 6 is stopped after pumping water in this way, the water in the pumping pipe connected to the suction port 3 will flow down, but because of the check valve 4, the water in the casing 1 will not be discharged from the suction port 3. Since sufficient water remains in the pump casing 1, the next pumping operation can be carried out immediately.

The pump of this invention has the air-water separation chamber 14, the air-water separation wall 15, and the axial flow pump mechanism in the pump casing 1 as described above, thereby achieving a self-priming action similar to that of a self-priming type centrifugal pump. In addition, the air-water separation wall 15 speeds up air-water separation, making it easy for the pump to quickly pump up water. At the same time, the air-water separation chamber can be made smaller, so the pump casing can be made smaller, and after pumping water, it can be used in the same way as an axial flow pump. This provides the characteristics of low head and large water flow.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of the pump of this invention, and Fig. 2 is a vertical side view of the pump of this invention.
It is a longitudinal sectional royal view taken along the line A-A. 1...Pump casing, 2...Discharge port, 3...
Suction port, 4... Check valve, 5... Cover, 7... Impeller, 8... Peripheral wall, 9... Bent pipe, 10... Opening,
11... Annular water conduit, 14... Air-water separation chamber, 15.
...Air-water separation wall.

Claims (1)

[Scope of utility model registration request] A air-water separation chamber is provided in the lower part, a suction port with a check valve is provided near the front upper part of the pump casing with a discharge port provided in the upper part, and an axial-flow type impeller is installed near the lower part of the pump casing. At the same time, the suction side of the front part of the cylindrical peripheral wall surrounding the outside of the impeller is communicated with the suction port through a curved pipe,
An annular water conduit with a semicircular cross section is formed inside the rear part of the casing opposite to the discharge side opening at the rear of the peripheral wall for inverting water discharged from this opening outward and guiding it into the air-water separation chamber. , and a self-priming axial flow pump characterized in that an air-water separation wall is provided above the air-water separation chamber in the pump casing.