CN114458606A - Cutting system of grinding pump and grinding pump - Google Patents

Abstract

The invention provides a cutting system of a grinding pump and the grinding pump. The cutting system includes: a cutting disc adapted to be secured to the grinding pump at an inlet thereof and having a cutting surface with a plurality of cutting ports thereon; the cutting knife is suitable for being rotationally connected with the grinding pump through a rotating shaft and comprises at least two blades, each blade is provided with a cutting edge on one side in the rotating advancing direction, and the cutting knife is arranged on the upstream side of the cutting disc and forms shearing with a cutting opening of the cutting disc through the cutting edge when rotating; each cutting aperture of the cutting disk includes a hole region extending from the cutting surface through the cutting disk to form a feed aperture, and a cutting region projecting from the cutting surface, the cutting region surrounding the hole region and forming a plurality of recessed regions between each cutting aperture on the cutting surface. The cutting system can effectively cut and reduce the size of foreign matters, and the uncut foreign matters can be flexibly separated, so that the clamping stagnation of the impeller/the cutting knife is avoided, and the use efficiency and the safety are improved.

Description

Cutting system of grinding pump and grinding pump

Technical Field

The present invention relates to the field of grinder pumps, and more particularly to a cutting system for a grinder pump.

Background

Pumps for pumping/transporting liquids and slurries containing solid matter or semi-solid matter may be equipped with a device arranged on the suction side of the pump for cutting the solid matter suspended in the liquid into smaller sized portions for better passage through the pump, these pumps also being referred to as grinder pumps or chopper pumps. Generally, the cutting system of the grinder pump includes a cutting blade having a cutting edge, a rotating shaft, and a cutting disk having a cutting surface with a series of holes with cutting edges, wherein the cutting blade rotates with the rotating shaft and forms a shearing effect with the holes on the cutting disk during operation. However, since the cutting edges of the cutting blades and the cutting edges of the cutting disk are coplanar, the liquid transported by the grinder pump contains solid or semi-solid particles, fabrics and other floating foreign matters which are easy to be clamped into the gap between the cutting blades and the integral plane. Once the motor is clamped, foreign matters are difficult to disengage, so that the rotating shaft is easy to be blocked, and even the motor is blocked or has a large load. Similarly, the foreign matter is cut continuously and is not broken, which can also cause the foreign matter in the liquid not to be transported out, resulting in the clamping stagnation of the impeller/cutting knife. Therefore, higher requirements have been put on the installation accuracy and structural design aspect of the cutting system of the grinding pump in practical application.

Disclosure of Invention

The invention provides an improvement based on various factors in the prior art, provides a cutting system capable of smoothly cutting and discharging foreign matters, and improves the cutting effect and efficiency.

To this end, according to one aspect of the present invention, there is provided a cutting system of an abrasive pump, the cutting system comprising: a cutting disc adapted to be secured to the grinding pump at an inlet thereof and having a cutting surface with a plurality of cutting ports thereon; the cutting knife is suitable for being rotationally connected with the grinding pump through a rotating shaft and comprises at least two blades, each blade is provided with a cutting edge on one side in the rotational advancing direction, the cutting knife is arranged on the upstream side of the cutting disc and forms shearing with the cutting opening of the cutting disc through the cutting edge when rotating; wherein each cut of the cutting disk includes a hole region extending from the cutting surface through the cutting disk to form a feed port, and a cutting region projecting from the cutting surface, the cutting region surrounding the hole region and forming a plurality of recessed regions between each cut on the cutting surface.

In the cutting system of the present invention, the recessed area between the respective cutting openings, which provides an axial clearance between the cutting blade and the cutting disc, is obtained by improving the structure of the cutting openings. Therefore, except the position of the cutting opening, the adjacent surface without small gap between the cutting knife and the cutting disc ensures the shearing action at the shearing interface of the cutting knife and the cutting disc, and foreign matters can be smoothly cut and discharged.

The present invention may further include any one or more of the following alternatives according to the above technical idea.

In certain alternatives, the plurality of cutting openings are distributed radially of the cutting disc and are arranged circumferentially about the axis of the rotating shaft.

In certain alternatives, the cutting zone of the cutting opening is configured as an annular structure and includes an inner cutting edge disposed at the annular inner rim and an outer cutting edge disposed at the annular outer rim. The cutting edge sets up to the design including inside and outside two cutting edges, can be favorable to fully cutting the foreign matter that gets into the hole region via cutting area, further ensures cutting system's effective operation.

In some alternatives, the ring-shaped structure has at least one indentation, or the ring-shaped structure is configured as a closed ring.

In certain alternatives, the cutting disc comprises a plurality of cutting groups, each cutting group comprising at least two of the plurality of cutting openings, and the plurality of cutting groups are arranged distributed radially of the cutting disc and arranged circumferentially about the axis of the rotating shaft.

In certain alternatives, the two cutting openings in each cutting group are connected by at least one cutting tip, the cutting tip edge of the cutting tip connecting the cutting edges of the cutting zone.

In some alternatives, the cutting tip of the cutting tip is arranged towards the direction of advance of the cutting blade.

In some alternative forms, the cutting disc is also provided with a plurality of cutting blocks, which are arranged between the cutting openings and are provided with cutting block edges arranged towards the advancing direction of the cutting knife.

In certain alternatives, the cutting surface of the cutting disk further comprises a plurality of ribs connected to or spaced from the cutting ports, the ribs projecting beyond the cutting surface and being circumferentially disposed about the axis of the rotating shaft.

In some alternatives, the plurality of ribs are configured in an arc or line shape and are distributed along the radial direction of the cutting disc, wherein the arc tangent of the ribs coincides with the advancing direction of the cutting blade.

In certain alternatives, the plurality of recessed areas are configured as at least one plane.

According to another aspect of the present invention, there is provided an abrasive pump comprising a pump body having an inlet and an outlet, and a rotatable shaft disposed within the pump body, the abrasive pump further comprising a cutting system of the abrasive pump described above, a cutting disc of the cutting system being secured to the inlet, a cutting blade of the cutting system being coupled to and driven in rotation by the rotatable shaft such that a cutting edge of the cutting blade forms a shear with a cutting opening of the cutting disc.

The cutting system can effectively cut and reduce the size of foreign matters, and the uncut foreign matters can be flexibly separated, so that the clamping stagnation of an impeller/a cutting knife of a grinding pump is avoided, and the use efficiency and the safety of a product are improved. The cutting system has low cost, is easy to produce and process, and can prolong the service life.

Drawings

Other features and advantages of the present invention will be better understood by the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like characters represent the same or similar parts, and in which:

FIG. 1 is a schematic cross-sectional view of an abrasive pump according to one embodiment of the invention;

FIG. 2 is an exploded view of a cutting system applied to a grinder pump according to one embodiment of the present invention;

FIG. 3 is a schematic exploded view similar to FIG. 2 showing the cutting system;

FIG. 4a is a schematic view of one embodiment of a cutting group on the cutting disk of FIG. 3;

fig. 4b is a schematic view of another embodiment of the cutting group on the cutting disk of fig. 3.

Detailed Description

The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The description herein of the structural positions of the respective components, such as the directions of upper, lower, top, bottom, etc., is not absolute, but relative. When the respective components are arranged as shown in the drawings, these direction expressions are appropriate, but when the positions of the respective components in the drawings are changed, these direction expressions are changed accordingly.

The terms "coupled" and "connected" are used broadly and may include, for example, a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.

As shown in connection with fig. 1, the grinder pump 10 includes a pump body 11 having an inlet 14 and an outlet 15, a rotary shaft 12 is provided in the pump body 11, and an impeller 13 is supported by and driven to rotate by the rotary shaft 12 in a chamber defined in the pump body 11, thereby achieving liquid transfer from the inlet 14 on a suction side or an upstream side to the outlet 15 on a discharge side or a downstream side. Typically, the cutting system 20 of the grinder pump 10 is arranged at the inlet 14 and comprises a cutting disc 21 and a cutting knife 22 which shear in cooperation with each other. Wherein the cutting disc 21 is fixedly connected with the pump body 11 by a screw fastener, for example, and covers the inlet 14, a feed port for filtering is formed by the cutting port 30, and the cutting knife 22 is connected with the rotary shaft 12 by a screw fastener, for example, on the upstream side of the cutting disc 21, so that the cutting disc 21 is combined to cut foreign matters entering the feed port while rotating, and the size of the foreign matters in the fluid (such as sewage) is reduced, and the foreign matters can smoothly enter the pump body.

It should be understood that in the following description, the description of the grinder pump is given by way of example of a water pump for conveying sewage, however, grinder pumps suitable for implementing the invention include, but are not limited to, water pumps with cutting function, suction cleaners, suction filters, etc.

According to the concept of the invention, an axial gap is provided between the cutting disc and the cutting knife of the cutting system, so that foreign matters are fully cut and smoothly discharged into the pump body, the axial gap is realized without additionally arranging parts, and the influence on the conventional shearing operation is avoided.

In particular, with reference to fig. 2 and 3, a cutting system according to an embodiment of the invention comprises a cutting disc 21 and a cutting knife 22, wherein the cutting disc 21 is adapted to be fixed to the grinding pump at the inlet 14 and has a cutting surface 211, which cutting surface 211 is provided with a plurality of cutting openings 30. The cutting knife 22 is adapted to be rotationally coupled with the grinding pump by means of a rotary shaft 12 (not shown in fig. 2 and 3) extending through an opening 213 in the cutting disc 21 and comprises at least two blades 221. Two blades are exemplarily shown in the figure, and three or four blades can be arranged according to actual needs. Each blade 221 is provided with a cutting edge 222 on one side in the rotational advancing direction (as indicated by an arrow in fig. 3), and when the cutting blade 22 is rotated by the rotation shaft 12, the cutting edge 222 and the cutting opening 30 of the cutting disk 21 perform a shearing action, thereby cutting foreign matter.

As shown in connection with fig. 4a or 4b, in certain embodiments, each cutting opening 30 of the cutting disk 21 includes a hole region 31 extending from the cutting surface 211 through the cutting disk 21 to form a feed opening. In certain embodiments, the hole region 31 can be configured to be uniform in axial dimension, or to increase or decrease in dimension in the feed direction. Furthermore, although the hole area 31 is shown as having a circular cross-section, any other suitable cross-sectional shape is possible, such as oval, triangular, square, rectangular, regular or irregular polygonal, etc. In some embodiments, each of the cuts may have the same or different dimensions and may have the same or different cross-sectional shapes.

According to the present invention, the cuts 30 advantageously comprise cutting zones protruding from the cutting surface 211, said cutting zones surrounding the hole zone 31 and forming a plurality of recessed zones 212 between the individual cuts 30 on the cutting surface 211, as shown in fig. 3. Depending on the fluid to be delivered by the grinder pump and the foreign particles therein, the distance that the cutting region extends beyond the cutting surface 211 may be determined according to practical needs, thereby defining the recess depth (i.e., axial clearance) of the recessed region 212, so long as the cutting edge 222 of the cutting blade 22 can be adjusted to fit the cutting edge of the cutting region. Optionally, the plurality of recessed regions is configured as at least one plane. In some embodiments, each cutting region may be disposed to extend different distances from the cutting surface 211 such that the plurality of recessed regions are configured as a plurality of planes, thereby achieving the effect of multi-stage cutting.

In various embodiments, the recessed area provides a moving space for foreign matters on the cutting surface, so that clamping stagnation with the cutting knife or the rotating shaft is not formed, and smooth transmission of the foreign matters is guaranteed. Meanwhile, the sunken areas only exist among the cutting openings, no adverse effect is generated on shearing operation between the cutting openings and the cutting knife, and smooth cutting of foreign matters is ensured.

In certain embodiments, the plurality of cutting ports 30 may be independent of each other and arranged in a radial distribution along the cutting disk 21 and circumferentially arranged about the axis of the rotatable shaft 12, such arrangement may include a radially evenly spaced distribution or a circumferentially evenly spaced distribution, as well as various manners of radially and/or circumferentially regular but unevenly spaced distribution.

Advantageously, a plurality of cutting openings 30 are distributed radially of the cutting disc 21 and are arranged circumferentially around the axis of the rotating shaft 12. In certain embodiments, the cutting disk 21 comprises a plurality of cutting groups 36, each cutting group 36 comprising at least two of the plurality of cutting openings 30, such as exemplarily shown in fig. 3, and each cutting group 36 is provided distributed radially of the cutting disk 21 and arranged circumferentially around the axis of the rotary shaft 12. In particular, the individual cutting groups 36 in fig. 3 may also be arranged at an angle to each other, such that the individual cutting openings 30 form a staggered arrangement on the cutting surface 211. In this manner, the cutting opening 30 can cover almost the entire cutting range of the cutting blade 22, thereby effectively and sufficiently performing the cutting operation.

In some embodiments, the cutting region of the cutting opening 30 may be configured as an annular structure and include an inner cutting edge 32 disposed at the annular inner edge and an outer cutting edge 33 disposed at the annular outer edge, as shown in fig. 4a or 4 b. It should be understood that the term "annular" as used herein refers to a shape formed around the ring, and is not limited to the circular shape shown in the drawings, but also includes, but is not limited to, triangular, square, rectangular, oval, regular or irregular polygonal, etc.

By arranging the inner cutting edge and the outer cutting edge, the cutting opening of the invention is cut for many times in the mutual shearing process of the cutting knife and the cutting opening. Once foreign matter in the fluid enters the pump body through the hole area 31 of the cutting opening 30 under the suction pressure of the grinding pump, the foreign matter is cut into sufficiently fine particles many times, and the small particles can smoothly enter the pump body and be discharged without hindrance.

In one embodiment shown in fig. 4a, the annular configuration of the cutting zone has at least one notch 37 to facilitate the entry of the small particles that have been cut into the pump body. In one embodiment shown in fig. 4b, the ring-shaped structure of the cutting zone may be arranged as a closed ring.

Fig. 4a also shows an embodiment of a cutting group 36a, in which two cutting openings 30 in the cutting group 36a are connected by at least one cutting tip 34, which is shown by way of example in the figure, the cutting tip 34a of which cutting tip 34 is connected to the cutting edge of the cutting zone, for example in the case of a ring-shaped structure with a cut-out 37, the cutting tip 34a being connected to the inner cutting edge 32. Advantageously, as shown in connection with fig. 3, the cutting tip 34a is arranged towards the advancing direction of the cutting blade 22. As can also be seen in fig. 4a, in some embodiments, the cutting disc 21 may also be provided with cutting blocks 35 arranged between the respective cutting openings 30, the cutting blocks 35 being provided with cutting block edges 35a arranged towards the advancing direction of the cutting knives 22. The arrangement of cutting tips and cutting blocks further provides for an adequate cutting of foreign particles, although shown in the figures in the form of triangles, this is not a limitation.

In another embodiment of the cutting group 36b shown in fig. 4b, the annular configuration of the cutting zone is arranged as a closed ring. In this case, the cutting tip edge 34b of the cutting tip 34 is connected to the outer cutting edge 33 of the cutting zone.

In some embodiments, as shown in fig. 3, the cutting surface 211 of the cutting disk 21 may further include a plurality of ribs 40 attached to or spaced from the cutting ports 30, the plurality of ribs 40 protruding from the cutting surface 211 and being circumferentially arranged about the axis of the rotating shaft. In a similar manner to the arrangement of the cutting openings, a plurality of ribs may be distributed in the radial direction of the cutting disc 21 and may optionally be configured in an arc or line shape, wherein in the arc-shaped manner the arc tangent of the rib 40 coincides with the advancing direction of the cutting blade 22.

No matter in a mode of independent cutting openings, a mode of constructing a cutting group, a mode of connecting the cutting openings or a mode of combining chip removal ribs, the cutting system effectively solves the problems that in the prior art, the cutting efficiency is low, an inlet of a pump body is easy to block and the like. With particular reference to fig. 1-3, during operation of the grinder pump 10, the impeller 13 in the pump body 11 is rotated by the rotating shaft 12, and liquid, such as sewage, is drawn through the cutting openings 30 of the cutting system 20 and into the inlet 14 of the pump body under centrifugal force. When the foreign matter in the sewage passes through the cutting opening 30, the cutting knife 22 driven by the rotating shaft 12 rotates and forms a shearing action with the cutting disc 21, large particles in the foreign matter are cut off and chopped into small particles with smaller sizes, and therefore the small particles enter the pump body 11 along with water flow through the cutting opening 30. Furthermore, the impeller 13 rotates to drive the sewage to be discharged from the outlet 15, so that the cutting effect and the drainage efficiency are improved.

It is to be understood that the embodiments shown in the figures merely show alternative shapes, sizes and arrangements of the various optional components of the cutting system of the grinder pump according to the invention and the grinder pump applied thereto, which are, however, merely illustrative and not restrictive, and that other shapes, sizes and arrangements may also be adopted without departing from the spirit and scope of the invention.

While the technical content and the technical features of the invention have been disclosed, it is understood that various changes and modifications of the disclosed concept can be made by those skilled in the art within the spirit of the invention, and the invention is not limited thereto. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims (12)

1. A cutting system (20) for a grinder pump, the cutting system comprising:

a cutting disc (21), the cutting disc (21) being adapted to be fixed to an inlet (14) of a grinding pump (10) and having a cutting surface (211), the cutting surface (211) being provided with a plurality of cutting openings (30);

a cutting knife (22), the cutting knife (22) is suitable for being rotationally coupled with the grinding pump through a rotating shaft (12) and comprises at least two blades (221), each blade (221) is provided with a cutting edge (222) on one side in the rotational advancing direction, the cutting knife (22) is arranged on the upstream side of the cutting disk (21) and forms shearing with a cutting opening (30) of the cutting disk (21) through the cutting edge (222) when rotating;

wherein each cutting opening (30) of the cutting disc (21) comprises a hole area (31) extending from the cutting surface (211) through the cutting disc (21) to form a feed opening, and a cutting area protruding from the cutting surface (211), the cutting area surrounding the hole area (31) and forming a plurality of recessed areas (212) between each cutting opening (30) on the cutting surface (211).

2. The cutting system of a grinding pump according to claim 1, characterized in that the plurality of cutting openings (30) are distributed radially of the cutting disc (21) and are arranged circumferentially around the axis of the rotating shaft (12).

3. The grinding pump cutting system according to claim 1, characterized in that the cutting area of the cutting opening (30) is configured as an annular structure and comprises an inner cutting edge (32) arranged at the annular inner edge and an outer cutting edge (33) arranged at the annular outer edge.

4. Cutting system of a grinding pump according to claim 3, characterized in that the ring-shaped structure has at least one indentation (37) or is provided as a closed ring.

5. The cutting system of a grinding pump according to any of claims 1 to 4, characterized in that the cutting disc (21) comprises a plurality of cutting groups (36), each cutting group (36) comprising at least two of the plurality of cutting openings (30), and in that a plurality of cutting groups (36) are provided distributed radially of the cutting disc (21) and arranged circumferentially around the axis of the rotating shaft (12).

6. The cutting system of a grinding pump according to claim 5, characterized in that the two cutting mouths in each cutting group (36) are connected by at least one cutting tip (34), the cutting tip edges (34 a; 34b) of the cutting tips (34) being connected to the cutting edges of the cutting zone.

7. The cutting system of a grinding pump according to claim 6, characterized in that the cutting tip (34 a; 34b) of the cutting tip (34) is arranged towards the advancing direction of the cutting knife (22).

8. The cutting system of a grinding pump according to any of claims 1 to 4, characterized in that the cutting disc (21) is further provided with a plurality of cutting blocks (35) arranged between the respective cutting openings (30) and provided with cutting block edges (35a) arranged towards the advancing direction of the cutting knives (22).

9. The grinding pump cutting system according to any of claims 1 to 4, characterized in that the cutting surface (211) of the cutting disc (21) further comprises a plurality of ribs (40) connected to or spaced from the cutting opening (30), the plurality of ribs (40) projecting beyond the cutting surface (211) and being arranged circumferentially around the axis of the rotating shaft (12).

10. The cutting system of grinding pumps according to claim 9, characterized in that the plurality of ribs (40) are configured as arcs or lines and are distributed in the radial direction of the cutting disc (21), wherein the arc tangent of the ribs (40) coincides with the advancing direction of the cutting knife (22).

11. The grinding pump cutting system according to one of claims 1 to 4, characterized in that the plurality of recessed regions (212) are configured as at least one plane.

12. An abrasion pump (10) comprising a pump body (11) having an inlet (14) and an outlet (15), and a rotary shaft (12) arranged within said pump body (11), characterized in that it further comprises a cutting system of the abrasion pump according to any one of claims 1 to 11, a cutting disc (21) of said cutting system being fixed to said inlet (14), a cutting knife (22) of said cutting system being coupled with said rotary shaft (12) and being driven in rotation by said rotary shaft (12) so that a cutting edge of said cutting knife (22) forms a shear with a cutting opening of said cutting disc (21).

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