CN212337652U

CN212337652U - Cutting structure of submersible sewage pump

Info

Publication number: CN212337652U
Application number: CN202020612340.0U
Authority: CN
Inventors: 郝福合; 柴春苗; 方慧康; 陆伟刚; 曹卫东; 张雪玲; 陈长华; 张留; 郭倩; 董国庆
Original assignee: Jining Antai Mine Equipment Manufacturing Co ltd
Current assignee: Jining Antai Mine Equipment Manufacturing Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2021-01-12
Anticipated expiration: 2030-04-16

Abstract

The invention relates to a cutting structure of a submersible sewage pump, and provides a cutting structure of a submersible sewage pump with an impurity cutting function.

Description

Cutting structure of submersible sewage pump

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a cutting structure of a submersible sewage pump.

Background

The most common underwater pumps in the market at present are submersible sewage pumps and deep-well pumps. Compared with a conventional land drainage pump, the submersible sewage pump has the advantages of compact structure, small floor area, long continuous operation time, convenience in installation, no need of water filling during starting and the like, but because sewage is required to be drained, the drained water usually contains various impurities such as long fibers, bags, belts, grass and cloth strips, for the submersible sewage pump used under a mine, large solid impurities such as stones and coal blocks can also exist in the conveyed water, so that the submersible sewage pump has the advantages of good passing performance, filtering and screening performance and impurity cutting performance which are very important. The patent of the publication No. CN209892459U proposes a cutting pump with a rotary cutter arranged on the blade of the impeller, and this cutting type pump must be a semi-open impeller, and the replacement cost is high in case of damage to the cutter, which affects the performance of the pump. The submersible pump cutting technology that patent technology of No. CN204961374U announced announces of grant bulletin number proposed, including the tube-shape cutting seat that has the through-hole inside and locate in the through-hole with the cutting knife of stealthily dirty pump's pump shaft coaxial setting, the outer fringe of cutting knife has the cutting edge, the cutting edge is cut with the medial surface clearance fit of through-hole, its cutting seat complexity is higher, increases manufacturing cost, debris and water need successively pass through the through-hole of cutting seat, filter screen, water course, the ring channel just gets into the pump chamber, the complicated suction performance that influences the pump that makes pump import flow field become.

Disclosure of Invention

Aiming at the problems and the technical defects of the existing cutting pump, the invention provides a cutting structure of a submersible sewage pump, which can effectively cut sundries in conveying sewage under the condition of not influencing the hydraulic performance of the pump, and prevent the submersible pump from being blocked.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in order to realize cutting, a cutting structure of a submersible sewage pump is characterized in that a fixed cutting disc is arranged below a water inlet of a volute on the basis of an original structure of the submersible sewage pump, a rotor shaft penetrates through the fixed cutting disc, regular hexagonal water inlet holes are uniformly distributed between a hub and the outer edge of the fixed cutting disc, a rotary cutter is arranged below the fixed cutting disc, and the rotary cutter and the fixed cutting disc are matched to cut sundries penetrating through the rotary cutter.

The technical scheme adopted by the invention for solving the technical problem also comprises the following steps: the inner diameter of the hub of the fixed cutting disc is slightly larger than the diameter of the rotor shaft passing through the hub of the fixed cutting disc so as to ensure that the rotor shaft does not contact the fixed cutting disc when rotating. The maximum size of the regular hexagonal water inlet holes uniformly distributed between the hub and the outer edge of the fixed cutting disc is determined by the maximum solid overflowing size of the submersible pump, generally is 50% of the minimum size of the section of a runner of the submersible pump, and when impurities are small particles smaller than the size of the water inlet holes, the impurities can enter the pump body through the water inlet holes and are discharged out of the submersible pump; when the impurities are larger solid particles or long fibers and the like, the impurities can be clamped on the regular hexagonal water inlet holes, are cut up by the rotary cutter, and are discharged by the water inlet submersible pump. The total area of all the water inlet holes is not smaller than the minimum inlet area when the submersible pump is hydraulically designed, and the fixed cutting disc plays roles of filtering and fixed cutting under the condition that the water inlet performance of the pump is not affected at all. 6 mounting holes are uniformly distributed on the fixed cutting disc and are fixed below the volute through matching with bolts.

The technical scheme adopted by the invention for solving the technical problem also comprises the following steps: one end of the front side of the rotary cutter hub is pressed against a shaft shoulder of the rotor shaft, one end of the back side of the hub is tightly pressed through a round nut, and circumferential fixing and transmission of the rotary cutter and the rotor shaft are realized through keys, so that the rotary cutter is fixed on the rotor shaft and rotates together with the rotor shaft to cut; after the front face of the hub of the rotary cutter abuts against the shaft shoulder of the rotor shaft, the whole back face is not contacted with the fixed cutting disc, so that the friction between the rotary cutter and the fixed cutting disc during rotation is avoided, and the non-contact between the rotary cutter and the fixed cutting disc is closely attached to cut impurities through the shearing force of relative motion.

Drawings

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a top and cross-sectional view of a stationary cutting disk

FIG. 3 is a top and cross-sectional view of a rotary cutter

The invention is further illustrated with reference to the following figures and examples.

In the figure, 1, a volute, 2, an impeller, 3, an impeller nut, 4, an oil chamber, 5, a mechanical seal, 6, a rotor shaft, 7, a fixed cutting disc, 8, a rotating cutter, 9, a key, 10, a round nut, 11, a mounting hole, 12, a water inlet, 13, a hub and 14, cutters are arranged.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to FIGS. 1-3:

a cutting structure of a submersible sewage pump comprises a volute 1, an impeller 2, an impeller nut 3, an oil chamber 4, a mechanical seal 5, a rotor shaft 6, a fixed cutting disc 7, a rotary cutter 8, a key 9 and a round nut 10; the rotor shaft 6 passes through the oil chamber 4, the mechanical seal 5, the impeller 2, the fixed cutting disc 7 and the rotary cutter 8 from top to bottom.

6 mounting holes 11 are uniformly distributed on the fixed cutting disc 7, the fixed cutting disc 7 is fixed on the volute 1 through bolts, and regular hexagonal water inlet holes 12 with uniform sizes are uniformly distributed between the hub and the outer edge on the fixed cutting disc 7.

The front surface of a hub 13 of the rotary cutter 8 is propped against the shaft shoulder of the rotor shaft 6, the back surface of the hub 13 is tightly pressed through a round nut 10, and the circumference is fixed through a key 9.

A gap is reserved between the hub of the fixed cutting disc 7 and the rotor shaft 6.

A gap is arranged between the front surface of the rotary cutter 8 and the fixed cutting disc 7.

4 cutters 14 are uniformly distributed on the rotary cutter 8.

When the product of the patent works, water containing impurities enters the impeller 2 through the water inlet hole 12 of the fixed cutting disc 7; impurities with the size smaller than that of the water inlet hole 12 directly enter the impeller 2; the impurity of rectangular shape, solid large granule can be blocked on inlet opening 12, are cut by the shearing force that the relative motion of rotary cutter 8 and fixed cutting dish 7 formed, then get into impeller 2 through inlet opening 12, at last along with the rotatory pressure boost of impeller 2, through 1 discharge immersible pump of spiral case.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a cutting structure of submersible sewage pump which characterized by: a fixed cutting disc (7) is arranged below a water inlet of a volute (1) of the submersible pump, a rotor shaft (6) penetrates through the fixed cutting disc (7), regular-hexagon water inlet holes (12) are uniformly distributed between a hub and the outer edge of the fixed cutting disc (7), and a rotary cutter (8) is arranged below the fixed cutting disc (7).

2. The cutting structure of a submersible sewage pump as set forth in claim 1, wherein: the inner diameter of the hub of the fixed cutting disc (7) is slightly larger than the diameter of the rotor shaft (6) passing through the hub; the maximum size of the regular hexagonal water inlet holes (12) uniformly distributed between the hub and the outer edge of the fixed cutting disc (7) is determined by the maximum solid overflowing size of the submersible pump, generally is 50% of the minimum size of the section of a runner of the submersible pump, and meanwhile, the total area of all the water inlet holes (12) is not smaller than the minimum inlet area of the submersible pump during hydraulic design; 6 mounting holes (11) are uniformly distributed on the fixed cutting disc (7).

3. The cutting structure of a submersible sewage pump as set forth in claim 1, wherein: one end of the front surface of a hub (13) of the rotary cutter (8) is propped against a shaft shoulder of the rotor shaft (6), one end of the back surface of the hub (13) is tightly pressed through a round nut (10), and circumferential fixing and transmission of the rotary cutter (8) and the rotor shaft (6) are realized through a key (9); the front surface of the hub (13) of the rotary cutter (8) is propped against the shaft shoulder of the rotor shaft (6), and the whole back surface is not contacted with the fixed cutting disc (7).