JPS6245113Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement to a rotary pump, particularly for sewage and waste.

Conventionally, there has been a rotary pump in which an impeller having a large number of radial blades made of a flexible elastic body is elastically housed in a pump casing formed by protruding a portion of the inner periphery between the suction and discharge ports.

However, the inner opening of the discharge port of these conventional pumps is generally circular, and in addition, since the impeller material is a flexible material such as rubber, the coefficient of friction is higher than that of the side wall of the pump casing. As a result, foreign matter such as paper, vinyl pieces, fibers, hair, etc. that get stuck in the minute gap between the impeller side surface and the pump casing side wall are not released even when they reach the discharge port, and increase gradually. The increase in required power eventually causes the impeller to lock up, causing a motor burnout accident.

Therefore, although it can be used for fresh water, it cannot be used for sewage or water.
It was completely unusable for filth.

In view of the above-mentioned current situation, the present invention forms a groove-like recessed part of an appropriate depth in the side wall of the pump casing corresponding to the discharge port, and connects the inner opening with the discharge port formed in an angular shape. A spiral groove that unwinds in the rotational direction of the impeller is cut on the boss-corresponding surface, and the outer end of the groove merges into the groove-shaped recess notch, so that foreign matter inserted between the impeller and the side wall of the pump casing is removed from the groove-shaped recess. It is an object of the present invention to provide a rotary pump for sewage and filth which is released at a notch and discharged to a discharge port by centrifugal force.

To explain in detail based on the embodiment shown in the figure, 1 is a pump casing, the inner surface is cylindrical, and a crescent-shaped cam 2 is integrally provided on the upper part so that a part of the circumference protrudes linearly. The opening 1a and the discharge opening 1b are formed so that the inner wall surface on the opposite side to the discharge opening 1b or the suction opening 1a coincides with the tangent line of the inner circumferential circle, and the inner opening surface is formed into an angular shape, and the inner wall surface is formed in an angular shape, and the inner wall surface is formed in an angular shape. It is designed to be a condensed passage.

Reference numerals 3 and 4 designate pump covers forming side walls of the pump casing 1, which are fitted onto the inner circumferential surface of the casing 1 and formed into a fan shape that is radial to the center of the casing only in the portion corresponding to the inner opening of the discharge port 1b. Groove-shaped recessed parts 3a, 4a of appropriate depth
is formed so that the wall surface smoothly continues with the discharge port 1b.

Further, the pump covers 3 and 4 have spiral grooves 3b and 4b cut out in the wall surface near the center corresponding to an impeller boss portion (to be described later) that unwinds in the rotational direction of the impeller, and the outer ends of the spiral grooves 3b and 4b are formed as described above. It merges into the groove-like recessed parts 3a and 4a.

Reference numeral 5 denotes an impeller having a large number of radial blades 5a made of a flexible elastic material such as rubber, and fixed to the tip of the pump shaft 6 with a key 7.
The pump covers 3 and 4 are internally arranged so that they are in elastic contact with the inner circumferential surfaces of the pump covers 3 and 4 and can rotate with a slight gap between them and the inner surfaces of the pump covers 3 and 4.

Next, the effect will be explained. When the impeller 5 rotates in the direction of the arrow in FIG. The blades 5a,
The fluid trapped between the spaces 5a and the foreign matter quickly jumps out in the tangential direction toward the discharge port 1b due to centrifugal force, and the blade 5a moves into the groove-like notch 3.
At the same time, the foreign matter that has rotated while being held between the side of the blade 5a and the pump covers 3 and 4 is also released at the recessed portion and flies out into the discharge port 1b.

Furthermore, foreign matter that tries to enter between the boss part of the impeller 5 and the pump covers 3 and 4 is prevented from entering the spiral groove 3.
b, 4b and the impeller 5 are prevented from intruding toward the center, and along the threaded grooves reach the groove-shaped recesses 3a, 4a, and are released at the recesses and discharged to the discharge port 1b. Ru.

Therefore, the impeller 5 and the pump cover 3,
The foreign matter caught between the two spaces is discharged to the discharge port 1b every rotation, and no accumulation occurs due to the circulation rotation.

Incidentally, the outer ends of the suction port and the discharge port may be circular, and appropriate screws or flanges may be provided so that they can be connected to the suction pipe and the discharge pipe.

Although the embodiment is illustrated for use on land, it can also be used underwater if it is directly connected to an underwater motor.

Furthermore, although the spiral grooves 3b and 4b are illustrated as approximately triple-wound with one spiral, they can be similarly implemented as single-wound or multiple spirals.

As detailed above, in the pump of the present invention, the inner opening of the discharge port is formed into an angular shape, the groove-shaped recessed part provided in the side wall of the pump casing corresponding to the angular shape, and the spiral part provided in the side wall of the casing corresponding to the impeller boss part. The groove eliminates any foreign matter remaining between the impeller and the casing side wall, and eliminates all problems associated with conventional pumps of this type for use with sewage and filth, such as side wall wear and increased power requirements.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a cross-sectional view, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, Fig. 3 is a plan view of the pump cover, and Fig. 4 is a cross-sectional view of the pump cover. FIG. 3 is a sectional view taken along the - arrow in FIG. 3; In the figure, 1 is the pump casing, 1b is the discharge port,
3 and 4 are pump covers, 3a and 4a are groove-like recessed portions, 3b and 4b are spiral grooves, and 5 is an impeller.

Claims (1)

[Claims for Utility Model Registration] (1) An impeller having a large number of radial blades made of a flexible elastic body is elastically attached to a pump casing with a part of its inner periphery protruding between the suction and discharge ports. In the pump casing side wall corresponding to the discharge port, a groove-like recessed part of an appropriate depth is formed to connect the inner opening with the square-shaped discharge port, and a groove-shaped recessed part is formed on the side wall of the pump casing corresponding to the impeller boss part of the pump casing side wall. 1. A rotary pump for sewage and filth, characterized in that a helical groove is cut into the surface to unwind in the rotational direction of the impeller, and the outer end of the groove merges into the groove-like recessed part. (2) The rotary pump for sewage and filth according to claim 1, wherein the groove-like recessed portion is formed in a fan shape radially with respect to the center of the pump casing. (3) The rotary pump for sewage and filth according to claim 1, wherein a plurality of the spiral grooves are cut.