JPH01310193A - Air suction device for pump - Google Patents

Abstract

PURPOSE:To dissolve the unbalance of a winged wheel which is caused by sucking a large bubble, and by reason of this, to prevent vibration and noise at the time of air suction, by providing at the outlet portion of an air suction pipe a means to fractionalize the bubble at the time of air suction. CONSTITUTION:The inelt portion of an air suction pipe 1 is connected to atmosphere, and the outlet portion looks out on the inlet portion of a winged wheel 2. A filter 4, for example, is provided at the outlet portion of the air suction pipe 1 as a means to fractionalize a bubble. Also, the bubble is uniformly dispersed by means of a bubble stirrer 3 provided at the winged wheel 2, and at the same time, the choking of the filter 4 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pump air intake device, and more particularly to a pump air intake device suitable for reducing vibration and noise generated during air intake.

[Conventional technology]

Conventionally, a technique has been proposed in which a pump is provided with an intake device and the flow rate is controlled by intake air.

However, the conventional technology does not take into consideration the vibration and noise generated during intake.

[Problem to be solved by the invention]

In the prior art, vibration and noise generated during intake are large, which poses a serious problem in practice.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air intake device for a pump that solves the problems of the prior art, reduces vibration and noise during intake, and allows practical use of flow rate control using intake air.

[Means to solve the problem]

The above object is achieved by providing at the outlet of the intake pipe a means for breaking up air bubbles during intake.

[Effect]

It is technically predicted that in a pump that controls the flow rate by intake air, the suction of large air bubbles causes an unbalance during the rotation of one impeller, which causes vibration and noise.

In the present invention, the air bubbles can be subdivided by the means for subdividing the air bubbles during intake, so it is possible to eliminate the unbalance during the rotation of the impeller due to the intake of large air bubbles, and therefore the vibration and noise during intake. This makes it possible to reduce the

As a result, it is possible to put into practical use flow rate control using intake air, and as a result, the discharge amount of the pump can be reduced by the amount of air taken in, which reduces the inflow speed of water sucked into the pump, which generates water in the water intake tank of the pump. It is possible to suppress the vortex flow that occurs, and it is possible to realize low water level operation of the pump.

〔Example〕

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

FIG. 1 shows a first embodiment of the present invention applied to a spindle pump, and is a partially cutaway view, and FIG. 2 is an enlarged view of portion A in FIG. 1.

In the first embodiment shown in these figures, an intake pipe 1 is provided at the inlet of an impeller 2 of a shaft pump.

The inlet portion of the intake pipe 1 is communicated with the atmosphere, and the outlet portion faces the inlet portion of the impeller 2.

A filter 4 is provided at the outlet of the intake pipe 1 as a means for dividing air bubbles.

On the other hand, a bubble agitator 3 is attached to the impeller 2. This bubble agitator 3 rotates together with the impeller 2 to uniformly disperse bubbles, and also rotates in contact with the filter 4 to prevent the filter 4 from clogging.

In the intake device of the first embodiment, when the operating water level of the pump decreases, the pressure at the inlet of the impeller 2 decreases, so air is taken in through the intake pipe 1.

When large air bubbles are sucked in during this intake, the air bubbles are divided into small pieces by the filter 4 provided at the outlet of the intake pipe 1.

Therefore, by sucking in large air bubbles during intake, it is possible to reduce vibrations and noise that occur when the impeller 2 becomes unbalanced during rotation.

The pressure at the inlet of the impeller 2 decreases as the water level becomes lower and becomes below atmospheric pressure, so air is taken in from the intake pipe 1, but the pump discharge amount decreases by the amount of air taken in.

This reduces the inflow speed of water sucked into the pump, suppresses the vortex generated in the water suction tank of the pump, and allows the pump to be operated at a low water level.

However, with conventional technology, large air bubbles are sucked in during intake, which generates large vibrations and noise.
However, in the first embodiment of the present invention, the filter 4 can break up air bubbles, so the pump can be operated in a healthy manner even at low water levels. It is possible.

Further, in this first embodiment, the bubble stirrer 3 can uniformly disperse the bubbles sucked in during intake.

Thereby, vibration and noise during intake can be further reduced. Moreover, since the bubble agitator 3 is rotated with the filter 4 in contact with it, clogging of the filter 4 can also be prevented.

Next, FIG. 3 is an enlarged sectional view showing a second embodiment of the present invention.

In this second embodiment, a filter 4 serving as a means for dividing bubbles and a bubble agitator 3 are provided apart from each other in the axial direction.

Therefore, although the bubble agitator 3 does not have the function of preventing the filter 4 from clogging, it is possible to use the filter 4 in the existing pump.
and the bubble agitator 3 can be easily attached.

Furthermore, in this second embodiment, the intake pipe 1 is installed in a direction that does not block the swirling flow at the inlet of the impeller 2.
The negative pressure value when the pump is operating increases, allowing efficient intake of air.

Next, FIG. 4 is an enlarged sectional view showing a third embodiment of the present invention.

In this third embodiment, the shaft 5 of the impeller 2 is a hollow shaft,
An intake port 6 is provided on this shaft 5, and the shaft 5 is also used as an intake pipe.

In addition, a filter 4 as a means for dividing air bubbles is provided at the tip of the impeller 2 in the above-mentioned 1lIt 5.
is installed.

In this third embodiment, the shaft 5 of the impeller 2 is hollow and also serves as an intake pipe, so the structure can be simplified.

Further, since the filter 4 is attached to the tip of the shaft 5 facing downward, it is difficult for dust to accumulate on the filter 4.

Furthermore, since the air outlet portion is located on the axis of the impeller 2, air can easily enter the impeller 2 evenly.

Next, FIG. 5 is an enlarged sectional view showing a fourth embodiment of the present invention.

In this fourth embodiment, a plurality of suction pipes 1 are provided at equal intervals in the circumferential direction of the suction bell 7 of the pump, and each suction pipe 1 has a plurality of suction pipes 1 at the outlet thereof as a means for dividing air bubbles into small pieces. A filter 4 is attached.

In this fourth embodiment, since the diameter of the outlet part of the intake pipe 1 can be made small, the filter 4 attached to this outlet part can be reduced.
In addition to being able to subdivide air bubbles into smaller ones, since multiple intake pipes 1 are provided at equal intervals, 1
The bubbles flowing into the impeller 2 can be made uniform.

6 is an enlarged sectional view showing a fifth embodiment of the present invention.

In this fifth embodiment, suction holes 8 are provided in the suction bell 7 at equal intervals in one circumferential direction.

An intake pipe 1 is connected to each intake hole 8, and a filter 4 is attached as a means for dividing air bubbles into small pieces.

This fifth embodiment also functions in the same manner as the fourth embodiment.

In the present invention, the means for dividing air bubbles is not limited to the filter 4 shown in FIG. 1, but may be a perforated plate, as long as it is capable of dividing large air bubbles when they are sucked in.

〔Effect of the invention〕

According to the present invention described above, since the bubbles can be divided into small pieces by means of the means for dividing the bubbles during intake, it is possible to eliminate the unbalance during the rotation of the impeller caused by sucking in large bubbles, and therefore, the unbalance during the rotation of the impeller due to the intake This has the effect of reducing vibration and noise when the air is sucked in, and it also makes it possible to put into practical use flow rate control using air intake, which reduces the pump's discharge amount by the amount of air that is taken in, reducing the amount of water sucked into the pump. The speed is reduced, the vortex generated in the water suction tank of the pump can be suppressed, and the pump can be operated at a low water level.

[Brief explanation of the drawing]

Fig. 1 shows a first embodiment of the present invention applied to a spindle pump, with a part cut away, Fig. 2 is an enlarged view of part A in Fig. 1, and Fig. 3 is a partially cutaway view. Figures 4, 5 and 6 are the second embodiment of the present invention. FIG. 3 is an enlarged sectional view showing the fourth and fifth embodiments. DESCRIPTION OF SYMBOLS 1... Intake pipe, 2... Impeller of pump, 4... Filter as means for dividing air bubbles, 5... Hollow shaft that also serves as intake pipe, 6... Inlet port, 7 ... Pump suction...1 Figure 1 Figure 1 Figure 3 Figure I 4 Figure Z Impeller 2 Air handling port 2 Impeller 4 Filter 7 σ and II included 6 Figure 4 Filter 70 and I) included J Hele 87 exit

Claims (1)

[Claims] 1. An intake device for a pump that takes air through an intake pipe at the inlet of the impeller of the pump, characterized in that means for dividing air bubbles during intake is provided at the outlet of the intake pipe.