JPH0413437Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a grinder pump that breaks up solid matter in suction liquid and discharges it together with liquid.

[Prior art and its problems]

As shown in FIGS. 6 to 9, a ring 5 has a number of longitudinal grooves 6'...6' having an arc-shaped cross section on the inner periphery, and the corners thereof are formed into fixed blades 7'...7'. ' is fitted on the inner periphery of the pump suction port 4', and the breaking impeller 8' fixed below the boss of the pumping impeller 2' is fitted into the ring 5' to break the solids. A grinder pump having a cutting mechanism is known.

In such a known grinder pump, if the center of the arc of the vertical groove 6', which is to become the fixed blade 7', is located on the inner peripheral edge of the ring 5', the edge of the fixed blade 7' becomes obtuse. Therefore, the ability to break solid materials is insufficient. Therefore, the center of the arc of the vertical groove 6' is located outward from the inner circumference of the ring 5',
Some fixed blades 7' have blade edges formed at an obtuse angle, but while this improves the ability to break solids, it prevents the solids from flowing into the pump vortex chamber 1' after cutting. When doing so, it gets caught on the sharp edge of the blade, making it difficult to separate from the vertical groove 6', resulting in a serious drawback in that the amount of water lifted is reduced.

[Purpose of invention]

An object of the present invention is to provide a grinder pump that has a fixed blade that is excellent in the effect of cutting solid objects and that allows the solid objects to easily separate after cutting.

[Structure of the idea]

In the grinder pump according to the present invention, a rotating body that fits with the inner periphery of the annular guide wall described later while maintaining a slight gap is fixed below the boss of the pumping impeller in the pump vortex chamber, and rotates together with the pumping impeller. In this way, a large number of vertical grooves serving as suction passages are arranged on the inner periphery of the annular guiding wall that is guided down from the center hole of the suction cover facing the lower edge of the blade plate of the pumping impeller, and these vertical grooves have a cross section. It has a circular arc shape, and the center of the arc is located outward from the inner circumference on the lower end surface of the annular guide wall, and slightly inward on the upper end surface, so that
The inner periphery of the cylindrical guide wall and the corner of the vertical groove are formed into an acute fixed blade at the lower part and an obtuse ridge line at the upper part, and the ridge of the outer circumferential vertical edge of the rotating body is formed into an acute fixed blade at the lower part. It is formed on a rotating blade that faces the blade.

〔Example〕

In the drawings of the embodiment, 1 is a pump vortex chamber, 2 is a pump swirl chamber;
is a pumping impeller housed in the pump swirl chamber 1,
3 is a suction cover facing the lower surface of the blade plate of the pumping impeller 2, 4 is a center hole of the suction cover 3, and 5 is a center hole 4.
An annular guiding lower wall guided lower than the inner circumference 5
A large number of vertical grooves 6...6 serving as suction passages are provided in i. These vertical grooves 6...6 have an arc-shaped cross section, and the center P of the arc is located below the inner circumference 5i on the lower end surface 5u of the annular guiding lower wall 5, and slightly inside on the upper end surface 5e. It is biased so that it is located on the opposite side. In other words, since the inner circumference 5i is vertical but the groove axis is inclined, the groove depth of the vertical grooves 6...6 gradually becomes shallower from the bottom to the top, and therefore the inner circumference 5i and the longitudinal groove 6 The corners 7 of 6 are formed into acute fixed blades 7s...7s in the lower part, and obtuse ridgelines 7n...7n in the upper part. Reference numeral 8 denotes a rotating body fixed below the boss to rotate together with the pumping impeller 2, and is fitted with the inner circumference 5i of the annular guiding wall 5 with a slight gap, so that the ridge of the outer circumferential longitudinal groove 9 The fixed blades 7s are formed on the rotary blade 10 facing the fixed blades 7s.

When the pump is driven, the rotating body 8 rotates together with the pumping impeller 2, and the fixed blades 7s...7s and the rotary blade 10
The solids are broken by the intersection with the ridge lines 7n...7n, and the solids leave the vertical grooves 6...6 along with the pumped water, and then pass through the pump vortex chamber 1 and exit the discharge port 11. It will be discharged.

[Effect of idea]

According to the grinder pump of the present invention, the inner periphery 5i of the annular guide wall 5 and the corners 7 of the vertical grooves 6...6 are formed into fixed blades 7s...7s with an acute angle in the lower part, and with obtuse angles in the upper part. Since it is formed on the ridgeline, it has the advantage that it has an excellent effect of breaking the solid material, and that the solid material after being broken can easily separate from the vertical grooves 6...6 without reducing the amount of water pumped.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the main part of the grinder pump of the present invention, Fig. 2 is a longitudinal sectional side view of the annular guiding wall of the grinder pump of the invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4 is a longitudinal sectional side view of the main part of the grinder pump of the invention. An enlarged plan view of the main part of the annular guide wall in the grinder pump of the present invention, Fig. 5A
is a cross-sectional plan view taken along the line A-A in FIG. 3, FIG. 5 B is a cross-sectional plan view taken along the line B-B in FIG. 3, and FIG.
Figure 7 is a vertical side view of the main part of a conventional grinder pump, Figure 7 is a vertical side view of the ring in the conventional grinder pump, Figure 8 is an enlarged view of the main part of Figure 7, and Figure 9 is a conventional grinder pump. FIG. 3 is an enlarged plan view of the main part of the ring. 1... Pump swirl chamber, 2... Lifting impeller, 3...
... Suction cover, 4 ... Center hole, 5 ... Annular guiding wall, 5i ... Inner circumference, 5e ... Upper end surface, 5u ... Lower end surface, 6 ... Vertical groove, 7 ... Corner, 7s ... Sharp fixed blade, 7n... Obtuse ridge line, 8... Rotating body, 9...
...Outer circumference vertical edge, 10...Rotating blade.

Claims (1)

[Scope of utility model registration request] Below the boss of the pumping impeller 2 in the pump vortex chamber 1, a rotating body 8 that fits with the inner periphery 5i of the annular guide wall 5 described later with a slight gap is fixed so as to rotate together with the pumping impeller 2. None, and a large number of vertical grooves 6...6 serving as suction passages are arranged on the inner periphery 5i of the annular guide wall 5 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. However, these vertical grooves 6...
...6 has an arc-shaped cross section, and the center P of the arc is located outward from the inner circumference 5i on the lower end surface 5u of the annular guide wall 5, and is shifted slightly inward on the upper end surface 5e. By this, the inner circumference 5 of the cylindrical lower guide wall 5
The corners 7 of the vertical grooves 6...6 are formed into acute-angled fixed blades 7e...7e in the lower part, and obtuse ridge lines 7n...7n in the upper part. A grinder pump in which a ridge of the edge 9 is formed on a rotary blade 10 facing the fixed blades 7s...7s.