Cutting System of Grinding Pump and Grinding Pump

Abstract

The present invention provides a cutting system and a grinding pump for a grinding pump. The cutting system includes: a cutting disc, which is adapted to be fixed to the inlet of the grinding pump and has a cutting surface, and a plurality of cutting openings are provided on the cutting surface; a cutting knife, which is adapted to be rotatably coupled to the grinding pump through a rotating shaft and includes at least two blades, and each blade is provided with a cutting edge on one side in the rotating forward direction. The cutting knife is arranged on the upstream side of the cutting disc and forms a shear with the cutting openings of the cutting disc through the cutting edge during rotation; each cutting opening of the cutting disc includes a hole area extending through the cutting disc from the cutting surface to form a feeding port, and a cutting area protruding from the cutting surface. The cutting area surrounds the hole area and forms a plurality of recessed areas between the respective cutting openings on the cutting surface. The cutting system of the present invention can effectively cut and reduce the size of foreign objects, and the uncut foreign objects can be flexibly disengaged to avoid jamming of the impeller / cutting knife, thereby improving the use efficiency and safety.

Description

Technical Field

[0001] The present invention relates to the field of grinding pumps, and in particular to a cutting system for a grinding pump. Background Art

[0002] Pumps for pumping / conveying liquids and slurries containing solid or semi-solid substances can be equipped with devices arranged on the suction side of the pump for cutting solid substances suspended in the liquid into smaller parts to better pass through the pump. These pumps are also called grinding pumps or chopping pumps. Generally, the cutting system of a grinding pump includes a cutting blade, a rotating shaft, and a cutting disc. The cutting blade is provided with a cutting edge, and the cutting disc is provided with a cutting surface. A series of holes with cutting edges are arranged on the cutting surface. During operation, the cutting blade rotates with the rotating shaft and forms a shearing effect with the holes on the cutting disc. However, since the cutting edge of the cutting blade and the cutting edge of the cutting disc are in a coplanar integral plane, the liquid transported by the grinding pump contains some floating foreign objects such as solid or semi-solid particulate matter, fabrics, etc. These foreign objects are easily stuck in the gap between the cutting blade and this integral plane. Once stuck, it is very difficult for the foreign object to break free, easily causing the rotating shaft to get stuck, and even resulting in the motor being blocked or overloaded. Similarly, if the foreign object cannot be cut or chopped, it will also cause the foreign object in the liquid not to be transported out, resulting in the impeller / cutting blade getting stuck. Therefore, in practical applications, higher requirements have been put forward for the installation accuracy and structural design of the cutting system of the grinding pump. Summary of the Invention

[0003] Based on the above various factors in the prior art, the present invention proposes an improvement, and provides a cutting system that can smoothly cut and discharge foreign objects, improving the cutting effect and efficiency.

[0004] To this end, according to one aspect of the present invention, there is provided a cutting system for a grinding pump. The cutting system includes: a cutting disc, the cutting disc being adapted to be fixed to the inlet of the grinding pump and having a cutting surface, and a plurality of cutting openings being provided on the cutting surface; a cutting knife, the cutting knife being adapted to be rotationally coupled to the grinding pump through a rotating shaft and including at least two blades, each blade being provided with a cutting edge on the side in the rotating forward direction, the cutting knife being arranged on the upstream side of the cutting disc and forming a shear with the cutting openings of the cutting disc through the cutting edge during rotation; wherein each cutting opening of the cutting disc includes a hole region extending through the cutting disc from the cutting surface to form a feed inlet, and a cutting region protruding from the cutting surface, the cutting region surrounding the hole region and forming a plurality of recessed regions between the respective cutting openings on the cutting surface.

[0005] In the cutting system of the present invention, by improving the structure of the cutting openings, a recessed area is obtained between the respective cutting openings, and this recessed area provides an axial clearance between the cutting tool and the cutting disc. Thus, except for the positions of the cutting openings, there are no adjacent surfaces with small clearances between the cutting tool and the cutting disc, ensuring the shearing action at the shearing interface between the two, and enabling foreign objects to be smoothly cut and discharged.

[0006] According to the above technical concept, the present invention may further include any one or more of the following optional forms.

[0007] In some optional forms, the plurality of cutting openings are distributed along the radial direction of the cutting disc and circumferentially arranged around the axis of the rotation axis.

[0008] In some optional forms, the cutting area of the cutting opening is configured as an annular structure, and includes an inner cutting edge provided at the inner edge of the annulus and an outer cutting edge provided at the outer edge of the annulus. The cutting opening is designed to include an inner and outer double cutting edge, which is beneficial for fully cutting foreign objects entering the hole area via the cutting area, further ensuring the effective operation of the cutting system.

[0009] In some optional forms, the annular structure has at least one notch, or the annular structure is configured as a closed annulus.

[0010] In some optional forms, the cutting disc includes a plurality of cutting groups, each cutting group includes at least two of the plurality of cutting openings, and the plurality of cutting groups are arranged to be distributed along the radial direction of the cutting disc and circumferentially arranged around the axis of the rotation axis.

[0011] In some optional forms, two cutting openings in each cutting group are connected by at least one cutting tip, and the cutting tip edge of the cutting tip connects the cutting edge of the cutting area.

[0012] In some optional forms, the cutting tip edge of the cutting tip is arranged towards the advancing direction of the cutting tool.

[0013] In some optional forms, a plurality of cutting blocks are further provided on the cutting disc, the cutting blocks are arranged between the respective cutting openings, and are provided with cutting block edges arranged towards the advancing direction of the cutting tool.

[0014] In some optional forms, the cutting surface of the cutting disc further includes a plurality of chip discharge ribs connected to or separated from the cutting openings, the plurality of chip discharge ribs protrude from the cutting surface, and are circumferentially arranged around the axis of the rotation axis.

[0015] In some optional forms, the plurality of chip discharge ribs are configured as arc-shaped or linear, and are distributed along the radial direction of the cutting disc, wherein the arc tangent of the chip discharge rib is consistent with the advancing direction of the cutting tool.

[0016] In some alternative forms, the plurality of recessed regions are configured as at least one plane.

[0017] According to another aspect of the present invention, there is provided a grinding pump, including a pump body having an inlet and an outlet, and a rotating shaft disposed within the pump body. The grinding pump further includes the cutting system of the above-mentioned grinding pump. The cutting disc of the cutting system is fixed to the inlet, and the cutting blade of the cutting system is coupled to the rotating shaft and driven by the rotating shaft to rotate, so that the cutting edge of the cutting blade forms a shear with the cutting opening of the cutting disc.

[0018] The cutting system of the present invention can effectively cut and reduce the size of foreign objects, and the uncut foreign objects can flexibly disengage, avoiding jamming of the impeller / cutting blade of the grinding pump, and improving the use efficiency and safety of the product. The cutting system of the present invention has low cost, is easy to produce and process, and can extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features and advantages of the present invention will be better understood from the following alternative embodiments described in detail in conjunction with the drawings, in which the same reference numerals identify the same or similar components, wherein:

[0020] Figure 1 is a schematic cross-sectional view of a grinding pump according to an embodiment of the present invention;

[0021] Figure 2 is an exploded view of the cutting system applied to the grinding pump according to an embodiment of the present invention;

[0022] Figure 3 Similar to Figure 2 shows an exploded view of the cutting system;

[0023] Figure 4a is Figure 3 a schematic view of one embodiment of the cutting group on the cutting disc in

[0024] Figure 4b is Figure 3 a schematic view of another embodiment of the cutting group on the cutting disc in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The implementation and use of the embodiments will be discussed in detail below. However, it should be understood that the specific embodiments discussed are only illustrative of the specific ways of implementing and using the present invention, and do not limit the scope of the present invention. The descriptions of the structural positions of the various components, such as the directions of up, down, top, bottom, etc., are not absolute but relative. When the various components are arranged as shown in the figures, these direction descriptions are appropriate, but when the positions of the various components in the figures change, these direction descriptions also change accordingly.

[0026] In this article, the terms "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0027] Combination Figure 1 As shown, the grinding pump 10 includes a pump body 11 having an inlet 14 and an outlet 15, a rotating shaft 12 is provided in the pump body 11, and an impeller 13 is supported by the rotating shaft 12 in a chamber defined by the pump body 11 and driven to rotate by the rotating shaft 12, so as to realize the liquid being transferred from the inlet 14 on the suction side or the upstream side to the outlet 15 on the discharge side or the downstream side. Generally, the cutting system 20 of the grinding pump 10 is arranged at the inlet 14, and includes a cutting disc 21 and a cutting knife 22 that cooperate with each other to shear. Among them, the cutting disc 21 is fixedly connected to the pump body 11, for example, by a threaded fastener, and covers the inlet 14, and forms a feed inlet that plays a filtering role, for example, through a cutting opening 30, and the cutting knife 22 is connected to the upstream side of the cutting disc 21, for example, by a threaded fastener and the rotating shaft 12, so that while rotating, it combines with the cutting disc 21 to cut foreign matter entering the feed inlet, so that the size of foreign matter in the fluid (for example, sewage) is reduced and smoothly enters the pump body.

[0028] It should be understood that in the following description, the grinding pump is described by taking a water pump for conveying sewage as an example, however, grinding pumps suitable for implementing the present invention include but are not limited to water pumps with cutting functions, vacuum cleaners, suction filters, etc.

[0029] According to the concept of the present invention, an axial gap is provided between the cutting disk and the cutting knife of the cutting system to allow foreign matter to be fully cut and smoothly discharged into the pump body. The axial gap does not require additional components to be implemented and will not affect conventional shearing operations.

[0030] Specifically, see Figure 2 and Figure 3 According to one embodiment of the present invention, the cutting system comprises a cutting disc 21 and a cutting blade 22, wherein the cutting disc 21 is adapted to be fixed to the inlet 14 of the grinding pump and has a cutting surface 211, on which a plurality of cutting openings 30 are provided. The cutting blade 22 is adapted to be inserted into the cutting disc 21 through a rotating shaft 12 ( Figure 2 and Figure 3 The grinding pump is connected to the grinding pump for rotation and includes at least two blades 221. Two blades are shown in the figure as an example, and three or four blades can be provided according to actual needs. Each blade 221 rotates in the forward direction (such as Figure 3On one side (as indicated by the arrow in the figure), a cutting edge 222 is provided. When the cutting tool 22 rotates driven by the rotating shaft 12, the cutting edge 222 and the cutting opening 30 on the cutting disc 21 interact through shearing, thereby implementing the cutting of foreign objects.

[0031] Combined Figure 4a Or Figure 4b As shown, in some embodiments, each cutting opening 30 of the cutting disc 21 includes a hole region 31 that extends through the cutting disc 21 from the cutting surface 211 to form a feed opening. In some embodiments, the hole region 31 can be set to have a consistent axial dimension, or the dimension can increase or decrease along the feed direction. Additionally, although the hole region 31 shown in the figure has a circular cross-section, any other suitable cross-sectional shape is feasible, such as oval, triangular, square, rectangular, regular or irregular polygon, etc. In some embodiments, each cutting opening can have the same or different sizes, and can also have the same or different cross-sectional shapes.

[0032] According to the present invention, the cutting opening 30 advantageously includes a cutting region that protrudes from the cutting surface 211. The cutting region surrounds the hole region 31 and forms a plurality of recessed regions 212 between each cutting opening 30 on the cutting surface 211, as Figure 3 shown. Depending on the fluid to be conveyed by the grinding pump and the foreign object particles therein, the distance that the cutting region extends out of the cutting surface 211 can be determined according to actual needs, thereby limiting the depth of the recess (i.e., the axial clearance) of the recessed region 212, as long as the cutting edge 222 of the cutting tool 22 can be adjusted to cooperate with the cutting edge of the cutting region. Optionally, the plurality of recessed regions are configured as at least one plane. In some embodiments, each cutting region can be set to extend different distances out of the cutting surface 211, so that the plurality of recessed regions are configured as multiple planes, thereby achieving a multi-stage cutting effect.

[0033] In each embodiment, the recessed region provides a movement space for foreign objects on the cutting surface, preventing jamming with the cutting tool or the rotating shaft and ensuring the smooth transmission of foreign objects. At the same time, the recessed region only exists between each cutting opening and does not have any adverse effect on the shearing operation between the cutting opening and the cutting tool, ensuring the smooth cutting of foreign objects.

[0034] In some embodiments, the plurality of cutting openings 30 can be independent of each other and are arranged radially along the cutting disc 21 and circumferentially around the axis of the rotating shaft 12. Such an arrangement can include radially evenly spaced distribution or circumferentially evenly spaced distribution, and also includes various ways of regular but uneven spaced distribution in the radial and / or circumferential directions.

[0035] Advantageously, a plurality of cutting openings 30 are distributed radially along the cutting disk 21 and arranged circumferentially around the axis of the rotation axis 12. In some embodiments, the cutting disk 21 includes a plurality of cutting groups 36, and each cutting group 36 includes at least two of the plurality of cutting openings 30, for example Figure 3 exemplarily shown in, and each cutting group 36 is arranged to be distributed radially along the cutting disk 21 and circumferentially around the axis of the rotation axis 12. In particular, Figure 3 the cutting groups 36 may also be arranged at an angle to each other, such that the cutting openings 30 form a staggered layout on the cutting surface 211. In this way, the cutting openings 30 can cover almost the entire cutting range of the cutting blade 22, thereby effectively and fully implementing the cutting operation.

[0036] In some embodiments, the cutting area of the cutting opening 30 may be configured as an annular structure, and includes an inner cutting edge 32 provided on the inner edge of the ring and an outer cutting edge 33 provided on the outer edge of the ring, as Figure 4a or Figure 4b shown. It should be understood that the "annular" here refers to the shape formed by surrounding, and is not limited to the circular ring shown in the figure, and should also include but not be limited to triangles, squares, rectangles, ellipses, regular or irregular polygons, etc.

[0037] By providing the inner and outer double cutting edges, the cutting opening of the present invention substantially implements multiple cuts during the process of mutual shearing between the cutting blade and the cutting opening. Once foreign matter in the fluid needs to enter the pump body through the hole area 31 of the cutting opening 30 under the suction pressure of the grinding pump, it will be cut into sufficiently small particles, and these small particles can smoothly enter the pump body and be discharged without hindrance.

[0038] In Figure 4a one embodiment shown, the annular structure of the cutting area has at least one notch 37, which can help the small particles after cutting to enter the pump body. In Figure 4b one embodiment shown, the annular structure of the cutting area may be set as a closed ring.

[0039] Figure 4a There is also shown a cutting group 36a of an embodiment, in which two cutting openings 30 in the cutting group 36a are connected by at least one cutting tip 34. One cutting tip is exemplarily shown in the figure, and the cutting tip edge 34a of the cutting tip 34 is connected to the cutting edge of the cutting area. For example, in the manner that the annular structure has a notch 37, the cutting tip edge 34a is connected to the inner cutting edge 32. Advantageously, in combination with Figure 3 shown, the cutting tip edge 34a is arranged towards the advancing direction of the cutting blade 22. From Figure 4aIt can also be seen that in some embodiments, cutting blocks 35 may be provided on the cutting disc 21 between each cutting opening 30. The cutting blocks 35 are provided with cutting block edges 35a arranged in the advancing direction of the cutting blade 22. The provision of the cutting tips and the cutting blocks further provides sufficient cutting of foreign matter particles. Although shown in a triangular manner in the figure, this is not a limitation.

[0040] In Figure 4b In the cutting group 36b of another embodiment shown, the annular structure of the cutting area 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 area.

[0041] In some embodiments, such as Figure 3 shown, the cutting surface 211 of the cutting disc 21 may further include a plurality of chip discharge ribs 40 connected to or spaced apart from the cutting openings 30. The plurality of chip discharge ribs 40 protrude from the cutting surface 211 and are circumferentially arranged around the axis of the rotating shaft. Similar to the arrangement of the cutting openings, the plurality of chip discharge ribs may be radially distributed on the cutting disc 21 and may optionally be configured as arcs or lines. Among them, in the arc-shaped manner, the arc tangent of the chip discharge rib 40 is consistent with the advancing direction of the cutting blade 22.

[0042] Whether in the form of independent cutting openings, in the form of a configured cutting group, in the form of connected cutting openings, or in the form of combined chip discharge ribs, the cutting system of the present invention effectively solves the problems of low cutting efficiency and easy blockage of the pump body inlet in the prior art. Specifically, in combination with Figures 1 to 3 For example, when operating the grinding pump 10, the impeller 13 in the pump body 11 is driven to rotate by the rotating shaft 12. For example, the liquid such as sewage is sucked in through the cutting opening 30 of the cutting system 20 under the action of centrifugal force and enters the inlet 14 of the pump body. When the foreign matter in the sewage passes through the cutting opening 30, the cutting blade 22 driven by the rotating shaft 12 rotates and forms a shearing action with the cutting disc 21, cutting and chopping the large particles in the foreign matter into small particles with reduced size. Thus, the small particles enter the pump body 11 through the cutting opening 30 along with the water flow. Furthermore, the impeller 13 rotates to drive the sewage to be discharged from the outlet 15, improving the cutting effect and drainage efficiency.

[0043] It should be understood that the embodiments shown in the figure only show the optional shapes, sizes, and arrangement manners of the cutting system of the grinding pump according to the present invention and the optional components of the applied grinding pump. However, they are only illustrative and not restrictive. Without departing from the spirit and scope of the present invention, other shapes, sizes, and arrangement manners may also be adopted.

[0044] The technical content and features of the present invention have been disclosed above. However, it can be understood that under the creative concept of the present invention, those skilled in the art can make various changes and improvements to the above-disclosed concept, but all fall within the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims

1. A cutting system for a grinding pump, characterized in that, The cutting system (20) includes: A cutting disc (21), which is adapted to be fixed to the inlet (14) of the grinding pump (10) and has a cutting surface (211), and a plurality of cutting openings (30) are provided on the cutting surface (211); A cutting knife (22), which is adapted to be rotatably connected to the grinding pump through a rotating shaft (12) and includes at least two blades (221). Each blade (221) is provided with a cutting edge (222) on one side in the rotating forward direction. The cutting knife (22) is arranged on the upstream side of the cutting disc (21), and when rotating, a shear is formed between the cutting edge (222) and the cutting opening (30) of the cutting disc (21). A plurality of the cutting openings (30) are distributed radially along the cutting disc (21) and circumferentially arranged around the axis of the rotating shaft (12); Wherein, each cutting opening (30) of the cutting disc (21) includes a hole area (31) extending through the cutting disc (21) from the cutting surface (211) to form a feed inlet, and a cutting area protruding from the cutting surface (211). The cutting area surrounds the hole area (31) and forms a plurality of recessed areas (212) between the cutting openings (30) on the cutting surface (211). The cutting area of the cutting opening (30) is configured as an annular structure and includes an inner cutting edge (32) provided on the inner edge of the annulus and an outer cutting edge (33) provided on the outer edge of the annulus.

2. The cutting system for a grinding pump according to claim 1, characterized in that, The annular structure has at least one notch (37), or the annular structure is set as a closed ring.

3. The cutting system for a grinding pump according to any one of claims 1 to 2, characterized in that, The cutting disc (21) includes a plurality of cutting groups (36). Each cutting group (36) includes at least two of the plurality of cutting openings (30), and a plurality of cutting groups (36) are arranged to be distributed radially along the cutting disc (21) and circumferentially arranged around the axis of the rotating shaft (12).

4. The cutting system for a grinding pump according to claim 3, characterized in that, Two cutting openings in each cutting group (36) are connected by at least one cutting tip (34), and the cutting tip edge (34a; 34b) of the cutting tip (34) connects the cutting edges of the cutting area.

5. The cutting system for a grinding pump according to claim 4, characterized in that, The cutting tip edge (34a; 34b) of the cutting tip (34) is arranged towards the advancing direction of the cutting knife (22).

6. The cutting system for a grinding pump according to any one of claims 1 to 2, characterized in that, A plurality of cutting blocks (35) are further provided on the cutting disc (21). The cutting blocks are arranged between the cutting openings (30) and are provided with a cutting block edge (35a) arranged towards the advancing direction of the cutting knife (22).

7. The cutting system for a grinding pump according to any one of claims 1 to 2, characterized in that, The cutting surface (211) of the cutting disc (21) further includes a plurality of chip discharge ribs (40) connected to or separated from the cutting openings (30). A plurality of the chip discharge ribs (40) protrude from the cutting surface (211) and are circumferentially arranged around the axis of the rotating shaft (12).

8. The cutting system for a grinding pump according to claim 7, characterized in that, A plurality of the chip discharge ribs (40) are configured to be linear and are distributed radially along the cutting disc (21).

9. The cutting system for a grinding pump according to claim 8, characterized in that, A plurality of the chip discharge ribs (40) are configured to be arc-shaped, and the arc tangent of the chip discharge rib (40) is consistent with the advancing direction of the cutting knife (22).

10. The cutting system for a grinding pump according to any one of claims 1 to 2, characterized in that, A plurality of the recessed regions (212) are configured as at least one plane.

11. A grinding pump (10) comprising a pump body (11) having an inlet (14) and an outlet (15), and a rotating shaft (12) disposed within the pump body (11), characterized in that, The grinding pump further includes a cutting system of the grinding pump according to any one of claims 1 to 10, a cutting disc (21) of the cutting system is fixed to the inlet (14), a cutting tool (22) of the cutting system is coupled to the rotating shaft (12) and driven to rotate by the rotating shaft (12), so that a cutting edge of the cutting tool (22) forms a shear with a cutting opening of the cutting disc (21).

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