JPH055273Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a grinder pump that crushes 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 vertical grooves 6'...6' having an arcuate 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 crushing 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 surface of the ring 5', the edge of the fixed blade 7' will form an obtuse angle. 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',
There are some fixed blades 7' whose blade edges are formed at an acute angle, but while this improves the ability to break solids, it also 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]

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a grinder pump having fixed blades which are excellent in breaking up solid objects and which allow the broken up solid objects to be easily removed.

[Structure of the idea]

In the grinder pump according to the present invention, a large number of vertical grooves are arranged on the inner periphery of the annular guide wall that is guided down from the center hole of the suction cover that faces the lower surface of the blade plate of the pump impeller in the pump vortex chamber. The groove has an arc-shaped cross section, and the center of the arc is located slightly outward from the inner periphery of the annular guiding wall, so that the angle between the inner periphery and the longitudinal groove is formed into a fixed blade with an acute angle, and By tapering the upper part of the inner periphery so that it has a larger diameter than the lower part, the angle between the inner periphery and the longitudinal groove is formed into a ridge line that gradually becomes obtuse as it moves upward. A rotating body formed in a tapered shape is fixed below the boss of the car so that its outer periphery fits with the inner periphery of the annular guide wall with a slight gap, so that it rotates together with the pumping impeller. None, the ridge portion of the outer peripheral edge of the rotating body is formed on a rotating blade that faces the fixed 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 arranged in i. These longitudinal grooves 6...6 have a circular arc shape in cross section, and by locating the center P of the arc slightly outward from the inner circumference 5i of the annular guiding lower wall 5, the inner circumference 5i and the longitudinal grooves 6 The fixed blade 7s has an acute corner 7, and is tapered so that the upper part of the inner periphery 5i has a larger diameter than the lower part.
In other words, since the groove axis is vertical but the inner circumference 5i is tapered, the groove depth of the vertical grooves 6...6 gradually becomes shallower from the bottom to the top. . . . As the corner 7 with 6 moves upward, the ridge line 7n becomes gradually obtuse. Reference numeral 8 denotes a rotating body fixed below the boss of the pumping impeller 2 so as to rotate together with the pumping impeller 2, and its outer periphery is formed into a tapered shape so that it fits with the inner periphery 5i of the annular guide wall 5 with a slight gap. Also, the outer circumferential vertical edge 9
A ridge portion is formed on the rotary blade 10 facing the fixed portions 7s...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 guiding 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 is easily separated from the vertical grooves 6, so that the amount of water pumped is not reduced.

[Brief explanation of drawings]

Fig. 1 is a vertical 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 guide wall in the grinder pump of the invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4 is 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 line A-A in FIG. 3, FIG. 5 B is a cross-sectional plan view taken along 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] Vertical grooves 6...6 are formed 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 in the pump swirl chamber 1.
These vertical grooves 6...6 have a circular arc shape in cross section, and the center P of the arc is located at the inner circumference 5i of the annular guiding lower wall 5.
By positioning it slightly outward from the inner periphery 5i
The corners 7 of the vertical grooves 6 are formed into sharp fixed blades 7s, and the inner periphery 5i is tapered so that the upper part of the inner periphery 5i has a larger diameter than the lower part. The corners 7 of the vertical grooves 6 are formed into gradually obtuse ridge lines 7n as they move upward, and the outer periphery maintains a slight gap with the inner periphery 5i of the annular guide wall 5 below the boss of the pumping impeller 2. A rotating body 8 formed in a tapered shape so as to fit together is fixed so as to rotate together with the pumping impeller 2, and the ridge of the outer circumferential vertical edge 9 of the rotating body 8 is connected to the fixed blades 7s...7s. A grinder pump formed on opposing rotary blades 10.