JP2005214190A - Impurity crushing device relative to vertical shaft type centrifugal pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein suction force is weak in a conventional crushing device due to a structure of a pump which is a main body of the device, clogging occurs often in combination of an installation position, a shape and the like of a crushing part, and the pump damage or the like occurs due to cavitation caused by clogging. <P>SOLUTION: A structure of the pump to be a mainstream has strong suction force and resistance against cavitation. Clogging is eliminated by reorganizing a set position and a structure of the crushing part to eliminate troubles such as pump damage caused by vibration due to cavitation generated by clogging, crushing pumping of impurity in viscous fluid is enabled. Since flow of fluid in the device is extremely smooth, the device is excellent in strong suction force and wear resistance, and can be used permanently. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a crushing apparatus that crushes foreign matters mixed in a liquid fed by a pump, efficiently clogs them, and efficiently feeds them.

  Conventionally, the crushing apparatus generally used mainly uses a horizontal shaft type pump, and the main shaft of the rotating impeller is further extended to the center of the front suction pipe so as to penetrate the impeller and cut into this. There are many blades and a system in which grit is fixed to the inside thereof, and the passage area of the crushed material is also reduced, so the pump inlet diameter must be increased. Depending on the physical properties after crushing, the vacuum force of the pump is weak, causing the grid to be clogged and making it impossible to feed liquid. Furthermore, clogging becomes more severe in highly viscous fluids. Further, the pump body vibrates due to cavitation occurring at this time, and the pump main body is also damaged. Also, even if this is a shaft type (submersible pump, etc.), a pump that sucks up from the bottom and discharges it upwards will simply cause the phenomenon as shown in the previous term to be just vertical. Is inevitable.

Problems to be solved by the invention

  An object of the present invention is to provide a compact apparatus capable of solving the troubles described in the section of the prior art and crushing / feeding foreign matter mixed in a highly viscous fluid.

Means for solving the problem

In the present invention, as a means for solving the above-mentioned problems, the basic premise is to use the shaft type centrifugal pump shown in FIG.
As shown in the figure, this pump has a suction port (6) located at the upper end of the body (1) and is sucked into the inlet of the impeller (5) while being rotated in the rotation direction of the main shaft. A strong vacuum of -760 mmHg can be exhibited under atmospheric pressure. The grit (8) having a shape in which the passage area of the crushed material is increased and the above-described vacuum force are united and the previous problem is solved.

  The strong vacuum force of the pump body of the embodiment shown in FIG. 1 is obtained by the fact that the mechanical seal (13) is mounted on the suction side opposite to the seal position of the conventional pump, and the body (1) It is generated by the swirling flow of the main shaft {circle around (2)} rotating at the center of ▼. This swirling flow passes through the cut blades {9}, passes through the cutout holes {11} arranged in a rectangle around the grit {8}, and is sucked into the entrance of the impeller {5}.

  This swirling flow, for example, plays the role of <Running> in the case of long jump, and impellers are similar to the case where the force of kicking the ground is extremely small compared to the case of flying from a state where a certain interval is stopped. The impact given to 5 ▼ is small, and therefore the wear resistance is increased.

The invention's effect

  As described above, in the present invention, the shaft-type centrifugal pump having a strong vacuum and wear resistance is used as a basic tone, and by mounting a specially shaped grit and cut blade having a large crushed material passage area, Contaminants mixed in the highly viscous liquid can be transported in a compact and efficient manner. Experimentally, it has succeeded in crushing and feeding impurities in the viscosity coefficient of 1000 cp, and the effect is considered to be great.

1 is a schematic cross-sectional view of an embodiment of the present invention. It is a schematic top view of the grit of this invention. It is a schematic sectional drawing of the grit of this invention. It is a schematic sectional drawing of the cut blade | wing of this invention. It is a schematic plan view of the cut blade of the present invention. It is A arrow directional view in FIG.

Explanation of symbols

(1) Body (2) Main shaft (3) Casing (4) Casing disk (5) Impeller (6) Suction port (7) Discharge port (8) Grit body (9) Cut blade body (10) Bearing box (7) 11 ▼ Grit cutout hole ▲ 12 ▼ Cut blade ▲ 13 ▼ Mechanical seal ▲ 14 ▼ Pulley A Suction fluid path B Discharge fluid path

Claims (2)

  In the shaft centrifugal pump, the main shaft (2) penetrates secretly in a bowl shape at the center, and the uppermost corner of the body (1) having a diameter about three times the inner diameter of the bearing box (10). The fluid sucked in from the suction port (6) located in the middle of the casing (6) has a certain clearance between the lowermost casing (3) and the casing disk (4) fixed on the upper part. Impeller (5) is installed. The blade of this impeller is facing upward and is an open type. As the impeller rotates, the head of the casing {circle over (3)} gradually rises, and the casing disc of the vertical centrifugal pump is constructed so as to be guided to the discharge port {circle around (7)} by the draining part of the volute inside the casing and further pumped to an arbitrary height. A crushing apparatus characterized in that a grit (8) is fixed on the top and a cutting blade (9) that rotates on a main shaft (2) at a close distance on the upper part is mounted.   The center portion of the grit (8) fixed on the casing disk (4) is tilted inward by about 15 degrees near the inner diameter of the casing disk and extends upward to form a conical shape. Open a rectangular cutout hole (11). The cut blade (9) fixed to the main shaft and rotating is conical with a certain clearance between the outer periphery of the grit (8) and the portion extending downward is a plurality of cut blades (12). In addition, this cut blade is inclined backward by about 20 degrees in the opposite direction to the rotation direction to increase the cutting efficiency. 2. The crushing apparatus according to claim 1, wherein the passage area of the crushed material is increased by extending the grit (8) and the cut blade (9) upward and downward, respectively.

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