JP2909687B2 - Pump device impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller of a pump device for sucking and discharging a fluid to be sucked mixed with solid matter and mud in a state where air is easily sucked.

[0002]

2. Description of the Related Art Conventionally, drainage treatment of spring water or pool water at a construction site has conventionally been carried out by using a pump device for sucking and discharging sewage and sewage.
Japanese Patent Application Laid-Open No. 2-199295) is applied.

[0003] That is, when a fluid to be sucked such as pool water is sucked from the suction port of the pump device, air is also attracted, and the mixed air is agitated by an impeller inside the pump device to remove the fluid to be sucked. After being mixed with water, it was discharged from the discharge port of the pump device through the guide blade.

[0004]

However, when the amount of air sucked from the suction port increases, the mixing with the fluid to be sucked does not proceed sufficiently even under the stirring action of the impeller. The vehicle stays near the axis of the car.

[0005] This means that the amount of stagnant air increases with the passage of time and the suction function of the pump device is greatly hindered, so that there has been a problem that the operating reliability of the pump device and the work efficiency of drainage treatment decrease. .

According to the present invention, in view of such a conventional situation, even if the mixed air in the fluid to be sucked stagnates near the axis of the impeller, the entire amount of the mixed air is mixed with the fluid to be sucked. It is an object of the present invention to provide an impeller of a pump device as described above.

[0007]

According to the impeller of the pump device of the present invention, an inner casing is housed in an outer casing having a discharge port, and a driving means housed in the inner casing has a lower end of a rotating shaft. A plurality of guide blades are protruded from the bottom of the inner casing into the lower portion of the outer casing, and a plurality of guide blades are provided on the inner peripheral surface of the lower side wall of the outer casing on the outer periphery of the impeller attached to the lower end of the protruding rotary shaft. In the pump device, which is provided in a circumferential direction with an interval from the outer casing and one end of the suction pipe is opened at the bottom of the outer casing covering the lower part of the impeller so as to face the impeller, the impeller is one of the rotating blades. At least one base end is extended to the boss of the impeller, and this extension is formed to be larger than the height of the rotating blade main body to maintain a small gap with the bottom of the outer casing. It is made formed in the gas-liquid mixing vanes.

[0008]

When the fluid to be sucked mixed with air is sent to the discharge port through the guide blade by the rotating operation of the impeller, even if a part of the air in the fluid to be sucked stagnates near the axis of the impeller, This stagnant air is thoroughly mixed with the water to be sucked by the agitation and mixing operation of the gas-liquid mixing blades, thereby preventing the pumping device from having a failure in pumping function.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

A pump device 11 shown in FIG. 1 is for sucking and discharging a fluid to be sucked mixed with mud together with air around a suction position, and is provided inside an outer casing 13 having a discharge port 12 inside an inner casing. The drive means 15 is housed inside the inner casing 14.

The driving means 15 has an impeller 1 to be described later attached to the lower end of a rotating shaft 16, and a plurality of guide blades 17 on the outer periphery of the impeller 1 for a pump-side bottom case 20 of the outer casing 13 to be described later. It is provided in the circumferential direction with an interval D kept from the side wall portion 20a.

Outer casing 13 that covers the lower part of impeller 1
Bottom, ie, the bottom plate 20b of the pump-side bottom case 20
One end of a suction pipe 21 described later is opened to face the axis of the impeller 1.

The outer casing 13 is provided with the flow path side case 1.
8, the pump side upper case 19 and the pump side bottom case 20 are sequentially connected, and the discharge port 12 is connected to the upper part of the flow path side case 18.
A suction pipe 21 integrally formed with the pump-side bottom case 20 is formed on the outer side of the suction pipe 21.

The other end of the suction pipe 21 is opened to a suction port 22, while a throttle member 23 and a backflow hole 2 are provided at an intermediate portion.
4 are provided.

The inner casing 14 includes a flow path side upper case 25, a flow path side lower case 26, and a pump side upper case 2.
7 and a pump-side lower case 28.

The driving means 15 comprises an underwater motor 31 comprising a stator 29 and a rotor 30 and the rotary shaft 16, which is supported by bearings 32 and 33. Reference numeral 34 denotes an impeller fixing nut.

The impeller 1 is for stirring the fluid to be sucked in from one end of the suction pipe 21 and sending out the air in the fluid to be sucked to the guide blades 17, and is shown in FIGS.
As shown in the figure, the base 2, the boss 3, and a plurality (for example, 8
) Of rotating blades 4.

At least one base end of the rotary blade 4 is extended to the boss 3 of the impeller 1, and this extended portion is connected to the bottom of the outer casing 13, that is, the bottom plate 20 b of the pump-side bottom case 20. It is formed on the gas-liquid mixing blade 5 with a small gap C therebetween. In other words, the gas-liquid mixing blade 5 formed at the extension of the rotary blade 4 projects greatly below the main body of the rotary blade 4.

It is desirable to provide one or more pairs of the gas-liquid mixing blades 5 at symmetrical positions with respect to the rotating shaft 16.

The fine gap C must be as small as possible, and is formed, for example, to 1 mm.

Next, the operation of the above embodiment will be described.

Priming water is poured in advance to the surface A in FIG.

When the submersible motor 31 is started, the rotation is transmitted to the impeller 1, and the fluid to be sucked mixed with air is mixed by the impeller 1, and is guided from the guide blade 17 to the outer casing 1.
While being sent to the discharge port 12 through the inside of the nozzle 4, a part of the fluid to be sucked is returned to the inside of the suction pipe 21 from the backflow hole 24, and the stirring and mixing by the impeller 1 is repeated again. The suctioned fluid mixed with air is continuously sucked from the suction port 22.

If the air in the fluid to be sucked is not sufficiently mixed with the water and a part of the air is separated and stays near the axis of the impeller 1, the unmixed air is removed from the air of the impeller 1. The liquid mixing blade 5 thoroughly mixes with the water of the fluid to be sucked and sends it out to the guide blade 17, so that the pumping operation of the pump device 11 continues in a normal state.

In this embodiment, the case where the airflow mixing blade 5 is formed integrally with the rotary blade 4 of the impeller 1 has been described. Instead, an airflow mixing blade (not shown) formed separately is provided. May be attached to the impeller fixing nut 34.

[0026]

According to the impeller of the pump device of the present invention, the base end of the rotating blade of the impeller is extended to the boss of the impeller, and the extended portion is provided between the impeller and the outer casing covering the lower part of the impeller. Since it is formed on the gas-liquid mixing blade with the fine gap, the amount of air in the fluid to be sucked sucked by the impeller increases, and this air tends to stagnate near the axis of the impeller. In this case, the air is thoroughly mixed with the fluid to be sucked by the gas-liquid mixing blades of the impeller, thereby preventing the pumping function of the pump device from being reduced, and therefore, the operation reliability of the pump device and the work of drainage treatment There is an excellent advantage that the efficiency is significantly improved.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a pump device.

FIG. 2 is a bottom view of the impeller.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 impeller 3 boss 4 rotating blade 5 gas-liquid mixing blade C minute gap 11 pump device 12 discharge port 13 outer casing 14 inner casing 15 drive means 16 rotating shaft 17 guide blade 20a side wall 21 suction pipe

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 7/04 F04D 29/22 F04D 29/66

Claims (1)

(57) [Claims] An inner casing is accommodated in an outer casing having a discharge port, and a driving means accommodated in the inner casing has a lower end portion of a rotating shaft projecting from a bottom portion of the inner casing into a lower portion of the outer casing. A plurality of guide blades are provided on the outer periphery of the impeller attached to the lower end of the protruding rotary shaft in a circumferential direction with an interval from the inner peripheral surface of the lower side wall of the outer casing. In a pump device in which one end of a suction pipe is opened at a bottom portion of an outer casing covering a lower part so as to face an impeller, the impeller has a base end of at least one of the rotating blades extending to a boss of the impeller. The extended portion is formed to be larger than the height of the rotating blade main body, and is formed as a gas-liquid mixing blade that maintains a small gap with the bottom of the outer casing. The impeller of the pump apparatus.