JPH0537033Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sewage pump having a mechanism for crushing foreign substances.

[Prior art and its problems] As shown in Fig. 5, the conventional filth pump has a ring 5' with a flat lower edge 4'e and groove teeth 6'...6' arranged vertically on the inner peripheral surface. is fitted onto the inner periphery of the pump suction port 4', and the crushing impeller 9' fixed below the boss of the water pumping impeller 2' is fitted into the ring 5' to establish a foreign matter crushing mechanism. The one that has been constructed is the mainstream.

This crushing mechanism can crush minute contaminants in waste, but contaminants such as fabrics that are larger than the diameter of the pump suction port 4' are crushed under the flat, continuous annular opening of the pump suction port 4'. adsorbs to the edge 4'e and closes it,
This method has the disadvantage of causing a significant drop in water pumping.
Furthermore, due to the structure of the crushing impeller 9', it has a weakness in that it is difficult to crush hard foreign substances.

[Purpose of the invention] The purpose of the invention is to easily crush foreign materials such as fabrics that are larger than the diameter of the pump suction port even if they are mixed in wastewater, and to crush hard foreign materials well. To provide a sewage pump that suctions without clogging and does not cause a drop in water pumping.

[Structure of the invention] In the sewage pump according to the invention, a rotating body is fixed below the boss of the pumping impeller in the pump vortex chamber and is fitted with the inner periphery of the annular guide wall described later with a slight gap. so that it rotates with the impeller,
A groove-shaped fixed blade serving as a suction path is installed vertically on the inner periphery of the annular guide wall led down from the center hole of the suction cover facing the lower surface of the blade plate of the pumping impeller. A side-opening annular relief opening is opened in the centrifugal direction so that the side edge is provided vertically in a part, and a part of the annular lower surface of the rotating body is made to protrude downward, and a vertical edge is provided between it and the non-protruding part. is formed, and the protruding part reaches the opening part of the annular relief opening so that the vertical edge faces the side edge.

[Function] When the pump is driven, the rotating body rotates together with the water pumping impeller, and large contaminants are once sucked in and then released in the direction of the ring-shaped relief port, and when re-suctioned, the side edges of the relief port and the rotating body are Primary crushing is performed in a rough cut shape by the lower vertical edge, and secondary crushing is performed in finely cut shapes between the grooved fixed blades.

[Example] In the drawings of the example, 1 is a pump vortex chamber, 2
3 is a pumping impeller housed in the pump swirl chamber 1;
4 is a center hole of the suction cover 3, and 5 is an annular guide wall guided down from the center hole 4, and has a suction passage and a suction passage on its inner periphery. Groove-shaped fixed blades 6, 6 are arranged vertically. Reference numeral 7 denotes a side-opening annular relief opening opened in the centrifugal direction in a part of the lower part of the peripheral wall of the annular lower guide wall 5 so that the side edge 8 is provided vertically; It is a rotating body that fits together with a certain gap, and is fixed below the boss so as to rotate together with the pumping impeller 2. 10a is a downward protruding portion formed on a part of the annular lower surface of the rotating body 9, 10b is a non-protruding portion, and 10c is a protruding portion 10a and a non-protruding portion 10b.
This is the vertical edge formed between the In other words, the rotating body 9
The annular lower surface of the blade constitutes a single-bladed spiral rotary blade. The protruding portion 10a of the rotating body 9 is guided down within the annular guiding lower wall 5 to the opening of the annular cut-out outlet 7, and the vertical edge 10c is configured to face the outlet side edge 8.

When the pump is driven, the rotary body 2 rotates together with the pumping impeller 2 within the annular guide wall 5. Small impurities mixed in the wastewater are finely crushed in the process of passing between the grooved fixed blades 6 . . . 6 together with the pumped water, and are discharged from the discharge port 11 . In addition, foreign objects such as fabrics that are larger than the diameter of the pump suction port are sucked once and then released in the direction of the ring-shaped relief port 7 and sucked again. Primary crushing is performed in a rough cut by the side edge 8 and the vertical groove 10c below the rotating body, and further the grooved fixed blade 6...
6, secondary crushing is performed finely, and the powder is discharged from the discharge port 11 after passing through the pump vortex chamber 1. Further, hard foreign matter is also strongly crushed by the side edge 8 of the outlet and the vertical edge 10c below the rotation, and then finely crushed between the grooved fixed blades 6...6.

[Effects of the invention] In the pump of the present invention, the lower edge of the suction port is not formed into a flat, continuous annular surface 4e as in the conventional pump, but has a side-opening annular relief port 7 in the centrifugal direction. In addition, since it has a rotating body 9 with a single-bladed spiral rotary blade on its lower surface, it can reliably crush even large fabric-like foreign objects, and can crush even hard foreign objects. It can be powerfully crushed without causing blockage, and there is no risk of lowering water pumping.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional side view of the main parts of the sewage pump of the present invention.
Fig. 2 is a bottom view showing the fitted state of the annular guiding wall and the rotating body in the sewage pump of the present invention, Fig. 3 A is a longitudinal cross-sectional side view of the annular guiding wall in the sewage pump of the present invention, and B is the same. A bottom view of the lower wall, FIG. 4 A is an external view of the rotating body in the sewage pump of the present invention, B is a bottom view of the rotating body, C is a vertical side view of the rotating body, and FIG. 5 is a conventional sewage pump. FIG. 3 is a longitudinal sectional side view of a main part showing a contaminant crushing mechanism in FIG. 1... Pump swirl chamber, 2... Lifting impeller, 3...
... Suction cover, 4 ... Center hole, 5 ... Annular guide wall, 6 ... Groove-shaped fixed blade, 7 ... Side-opening ring-shaped relief port, 8 ... Side edge, 9 ... Rotation Body, 10a...
Protruding portion, 10b... Non-protruding portion, 10c... Vertical edge.

Claims (1)

[Scope of utility model registration request] A rotating body 9 that fits with the inner periphery of the annular guide wall 5 described later with a slight gap is fixed below the boss of the pumping impeller 2 in the pump swirl chamber 1, and the pumping impeller 2 is fixed thereto.
A groove-shaped fixed blade 6 that serves as a suction path is provided on the inner periphery of the annular guide wall 5 that is guided down from the center hole 4 of the suction cover 3 facing the lower surface of the blade plate of the pumping impeller 2. At the same time, a side-opening annular relief opening 7 is opened in the centrifugal direction so that a side edge 8 is vertically provided in a part of the lower part of the peripheral wall of the annular guiding lower wall 5, and a part of the annular lower surface of the rotating body 9 is opened. The non-projecting part 10 is made to project downward.
A sewage pump characterized in that a vertical edge 10c is formed between the protruding portion 10a and the annular outlet 7, and the vertical edge 10c is opposed to the side edge 8.