JPS5842631Y2 - osui pump - Google Patents

Description

[Detailed description of the invention] Conventionally, pumps that handle sewage, sludge, etc. have been designed with a plate to prevent blockages caused by fibrous soft foreign objects such as cloth and straw debris mixed into the liquid from getting entangled with the inlet edges of the blades. A dressed impeller was used or a cutter device was installed in front of the impeller.

However, in the former case, there is a severe imbalance due to wear, which not only causes significant power loss, vibration, and noise, but also fundamentally makes the pump itself very expensive. The cutter is severely damaged by nails, metal pieces, pebbles, etc. that get mixed in, and therefore it becomes necessary to cut out soft foreign objects such as cloth pieces and straw waste, which causes the cutter to become stuck, making it impossible to achieve the intended purpose, etc. It has drawbacks.

In order to eliminate the above-mentioned drawbacks, the present invention has been developed by drilling holes of appropriate size in the substrate at the front and rear surfaces of the blade inlet edge of the impeller.
A sewage pump that aims to prevent blockage by generating a jet flow from the through hole toward the inflow end of the blade during operation, and by using the jet flow to release soft foreign matter that tends to become entangled with the inflow end edge. It is related to.

To explain in detail the embodiment shown in the figure, 1 is a submersible pump with a built-in electric motor, a closed type impeller 4 is fixed to the tip of a pump shaft 3 inside a pump casing 2, and a cover at the lower end that covers the front surface of the impeller. The plate 5 is fixed.

The impeller 4 has appropriately sized through holes 9, 10 and 1L12 bored toward the front and rear surfaces of the blade inlet edge 8, respectively. It is set up.

In addition, 13 is an appropriate number of legs hanging down from the lower surface of the cover plate 5, and 14.
Reference numeral 15 designates an appropriate number of back blades provided on the back sides of the front and rear substrates 6 and 7, the purpose of which is to reduce the leakage back from the volute chamber 16 to the inlet 17 and the thrust caused by the pressure difference between inside and outside the impeller. However, the amount of jets from the through holes 9 to 11 can also be adjusted.

However, during operation, high pressure is generated in the swirl chamber 16, and since the inlet 17 is low pressure, part of the water tends to return toward the inlet due to the pressure difference between the two.

Therefore, although it is somewhat reduced by the action of the back blade 140, the through hole 9
, 10, a jet flow is generated toward the blade inlet edge 8, respectively.

Further, the high pressure inside the swirl chamber 16 also acts on the back surface of the substrate 7, and although it is somewhat reduced by the action of the back blade 15, the through hole 11
．． Similarly, a jet flow is generated from the blade 12 toward the inlet edge 8 of the blade.

Therefore, since the jets from the through holes 9 to 12 constantly flow along the front and rear surfaces of the blade inlet edge 8, as shown in FIG. Even so, the foreign matter is released from the edge by the jet, and the foreign matter is sent to the swirl chamber 16 by sliding over the core.

Note that it is more effective to obtain a powerful jet flow by not providing the back blades 14 and 15 for the purpose of preventing foreign objects from getting stuck, but in the case of an elevated pump, they are provided ubiquitously to prevent a drop in pump performance. It is desirable to provide a

In addition, although the submersible pump using closed vanes was explained in this example, it is not limited to these, and semi-submersible pumps are used.
It is equally effective when used with an oven vane or an ordinary centrifugal pump.

In addition, it is better to make the through holes slightly larger and longer on the rear side (10 and 12 in this example) of the blade inlet edge than on the front side to release soft foreign matter and send it to the discharge side. It is effective for (see arrow in Figure 3).

As detailed above, when using the pump of the present invention, it is possible to prevent blockage in the impeller due to soft foreign matter getting entangled with the inlet edge of the impeller, which was considered extremely difficult in the past, with an extremely simple configuration, and it can be used for a long time. Even when various parts are worn out, the effect is not diminished at all, and it can be manufactured in a very stable manner.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional view of the main part, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is an enlarged explanatory view showing the relationship between the blade inlet edge and the through hole. In the figure, 2 is a pump ring, 3 is a pump shaft, 4 is an impeller, 5 is a cover plate, 6 and 7 are front and rear substrates, 8 is a blade inlet edge, and 9 to 12 are through holes.

Claims (1)

[Scope of utility model registration request] An impeller is provided with appropriately sized through-holes in the front and rear surfaces of the inlet edge of the impeller, and during operation, a portion of the water in the volute chamber of the pump casing flows from the back side of the substrate through the through-holes to the impeller. A sewage pump characterized in that water is ejected along the inlet edge.