A high efficiency centrifugal pump

Abstract

A high-efficiency centrifugal pump relates to the field of centrifugal pump technology. The fixed-blade assembly includes an outer tube and an inner tube. The outer tube is fixedly connected to an expansion tube by set screws. An outer frame is bolted between the outer and inner tubes. Three outer frames are evenly arranged along the circumference of the outer tube. A fixed cutting edge and a torque clutch are installed within the outer frame. The beneficial effects of this invention are: by incorporating a torque clutch and a fixed cutting edge capable of rotating and falling around a hinge axis in the fixed-blade assembly, when incoming stones become stuck between the moving blade and the fixed cutting edge, the portion of the fixed cutting edge in contact with the stone rotates and falls, preventing hard contact with the stone, thus protecting the blade from breakage and ensuring efficient pump operation.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and in particular to a high-efficiency centrifugal pump. Background Technology

[0002] Submersible sewage pumps are a type of centrifugal pump, typically used to pump sewage containing solids. The solid content of sewage is very complex, often containing easily entangled fibrous materials such as plastics and cloth strips. When pumping, these entangled materials continuously wrap around the impeller, causing blockage of the impeller flow channel and preventing the pump from operating. Submersible sewage pumps with cutters can cut fibrous impurities in sewage; however, when stones are sucked in and get stuck in the moving and stationary blades, the blades may chip or break, thus losing their cutting function and affecting the pump's efficient operation. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a high-efficiency centrifugal pump.

[0004] The technical solution provided by this invention is: a high-efficiency centrifugal pump, including a motor, an impeller, and a volute casing. The output shaft of the motor is connected to the impeller via a key B. The output shaft is axially positioned by a locking cap threaded onto the lower part of the impeller. The lower part of the locking cap is connected to a moving blade and a hydrocyclone via a key A. The volute casing has an expansion tube with an enlarged diameter below the impeller's suction inlet. The lower part of the expansion tube is connected to a hydrocyclone shroud via bolts. The bottom of the hydrocyclone shroud is connected to a positioning sleeve via a support arm. The positioning sleeve is rotatably connected to the hydrocyclone via two bearings and a spacer. The positioning sleeve axially positions the hydrocyclone. A fixed blade assembly is fixedly connected inside the expansion tube by a set screw.

[0005] The aforementioned fixed-blade assembly includes an outer tube and an inner tube. The outer tube is fixedly connected to the expansion tube by a set screw. The outer tube and the inner tube are fixedly connected to an outer frame by bolts. There are three outer frames evenly arranged along the circumference of the outer tube. A fixed cutting edge and a torque clutch are installed inside the outer frame.

[0006] The outer frame has a notch at the top, and the fixed cutting edge is placed in the notch. The fixed cutting edge is connected to the outer frame by a hinge shaft in the direction of movement of the moving tool. The outer frame has an inner protrusion in the direction of movement of the moving tool, and the fixed cutting edge has an outer boss in the direction of movement of the moving tool. The outer boss is located below the fixed cutting edge, and the inner protrusion presses on the outer boss.

[0007] The aforementioned torque clutch includes a square tube, with its end vertically fixed to the bottom of the outer frame. A positioning plate and a rotating sleeve are fixedly connected to the inner wall of the square tube. The positioning plate and the rotating sleeve are arranged coaxially. A compression spring, a torque plate, and a torque disk are installed between the positioning plate and the rotating sleeve, respectively. The positioning plate has six circumferentially distributed positioning pins B, and each positioning pin B is fixedly connected to a compression spring. The torque plate has positioning pins A, and the other end of each compression spring is fixedly connected to positioning pin A. The torque plate has a rotating one-way tooth B machined on the side opposite to the torque disk, and the torque disk has a rotating one-way tooth A machined on the side opposite to the torque plate. The rotating one-way tooth A and rotating one-way tooth B allow the torque disk to rotate only in one direction. The torque disk is rotatably connected to the rotating sleeve.

[0008] The aforementioned torque disc has several support plates on its outer circumference, and these support plates are evenly arranged along the circumference of the torque disc. One of the support plates supports the fixed cutting edge to the outer boss against the lower side of the inner protrusion.

[0009] The aforementioned hydrocyclone has a cone with a large upper diameter and a small lower diameter in the middle. Spiral blades are welded to the outer circle of the cone. The cyclone cover is a cone with a large upper diameter and a small lower diameter. The expansion tube has several vent holes above the cyclone cover, and the vent holes are evenly arranged along the circumference of the expansion tube.

[0010] The aforementioned moving tool includes an inner sleeve, which is connected to a connecting lock cap via a flat key A. Three moving cutting edges are welded to the outer side of the inner sleeve. The moving cutting edges are evenly arranged along the circumference of the inner sleeve. The moving cutting edges have an arc-shaped strip structure and are machined with a front angle and a rear angle.

[0011] The aforementioned torque disc rotates towards the outward protrusion, and the support plate tilts at an angle in the direction of rotation to support the fixed cutting edge. The bottom surface of the fixed cutting edge has a gap that can accommodate the next support plate rotating to support the fixed cutting edge again.

[0012] The beneficial effects of this invention are as follows: 1. By setting a torque clutch in the fixed blade assembly and a fixed cutting edge that can rotate and fall around the hinge axis, when the incoming stones get stuck in the moving blade and the fixed cutting edge, the part of the fixed cutting edge that contacts the stones rotates and falls, without making hard contact with the stones, thereby protecting the blade from breakage and ensuring the efficient operation of the pump. After the stones leave, the torque clutch can continue to complete the positioning of the fixed cutting edge to cut fibrous debris; 2. The large-diameter expansion pipe can reduce the inflow velocity of fibrous debris and reduce the length of the cut fibrous debris; 3. A cyclone separator is set at the lower part of the moving blade to drive the incoming water flow into a swirling state. The centrifugal force of the swirling flow causes the incoming stones to spiral upward along the cyclone separator and be discharged from the drain hole, which can discharge most of the larger diameter stones and further protect the blade; 4. The arc-shaped moving cutting edge and the fixed cutting edge make intersecting point contact during cutting, resulting in a small cutting torque and improved cutting efficiency. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Appendix Figure 2 This is a three-dimensional diagram of the fixed blade assembly in this invention;

[0015] Appendix Figure 3 This is a schematic diagram of the fixed blade assembly in this invention;

[0016] Appendix Figure 4 It is attached Figure 3 AA cross-section view;

[0017] Appendix Figure 5 This is an exploded view of the torque clutch in this invention;

[0018] Appendix Figure 6 It is attached Figure 4 Action graphics;

[0019] Appendix Figure 7 This is a schematic diagram of the moving blade in this invention;

[0020] Appendix Figure 8 This is a schematic diagram of the cyclone separator in this invention;

[0021] Appendix Figure 9 This is a schematic diagram of the outer frame in this invention.

[0022] In the diagram: 1-Impeller, 2-Snail shell, 201-Expansion tube, 202-Drain hole, 3-Motor, 301-Output shaft, 4-Locking cap, 5-Moving blade, 501-Inner sleeve, 502-Moving cutting edge, 503-Rake angle, 504-Receding angle, 6-Fixed blade assembly, 601-Outer frame, 6011-Inner protrusion, 6012-Notch, 602-Inner tube, 603-Outer tube, 7-Hydrocyclone, 701-Cone, 702-Helical blade, 8-Hydrocyclone shroud, 9-Positioning sleeve, 10- Support arm, 11-flat key A, 12-fixed cutting edge, 121-neutral, 122-outer boss, 13-square tube, 14-torque disc, 141-support plate, 142-rotating one-way gear A, 15-torque disc, 151-rotating one-way gear B, 152-locating pin A, 16-compression spring, 17-locating disc, 171-locating pin B, 18-rotating sleeve, 19-bearing, 20-spacer, 21-set screw, 22-torque clutch, 23-flat key B, 24-hinge shaft. Detailed Implementation

[0023] like Figures 1-9As shown, a high-efficiency centrifugal pump includes a motor 3, an impeller 1, and a volute 2. The output shaft 301 of the motor 3 is connected to the impeller 1 via a key B23. The output shaft 301 is axially positioned by a locking cap 4 threaded onto the lower part of the impeller 1. The lower part of the locking cap 4 is connected to a moving blade 5 and a hydrocyclone 7 via a key A11. The volute 2 has an expansion tube 201 with an enlarged diameter at the lower part of the suction port of the impeller 1. The lower part of the expansion tube 201 is connected to a hydrocyclone shroud 8 via bolts. The bottom of the hydrocyclone shroud 8 is connected to a positioning sleeve 9 via a support arm 10. The positioning sleeve 9 is rotatably connected to the hydrocyclone 7 via two bearings 19 and a spacer 20. The positioning sleeve 9 axially positions the hydrocyclone 7. The fixed blade assembly 6 is fixedly connected inside the expansion tube 201 by a set screw 21.

[0024] The fixed blade assembly 6 includes an outer tube 603 and an inner tube 602. The outer tube 603 is fixedly connected to the expansion tube 201 by a set screw 21. The outer tube 603 and the inner tube 602 are fixedly connected to an outer frame 601 by bolts. There are three outer frames 601 evenly arranged around the circumference of the outer tube 603. The fixed cutting edge 12 and the torque clutch 22 are installed inside the outer frame 601.

[0025] The upper part of the outer frame 601 is provided with a notch 6012, and the fixed cutting edge 12 is placed in the notch 6012. The fixed cutting edge 12 is rotatably connected to the outer frame 601 via the hinge shaft 24 in the direction of movement of the moving tool 5. The outer frame 601 is provided with an inner protrusion 6011 in the direction of movement of the moving tool 5, and the fixed cutting edge 12 is provided with an outer boss 122 in the direction of movement of the moving tool 5. The outer boss 122 is located below the fixed cutting edge 12, and the inner protrusion 6011 presses on the outer boss 122.

[0026] The torque clutch 22 includes a square tube 13, the end of which is vertically fixed to the bottom of the outer frame 601. A positioning disc 17 and a rotating sleeve 18 are fixedly connected to the inner wall of the square tube 13. The positioning disc 17 and the rotating sleeve 18 are coaxially arranged. A compression spring 16, a torque plate 15, and a torque disk 14 are respectively installed between the positioning disc 17 and the rotating sleeve 18. The positioning disc 17 has six circumferentially distributed positioning posts B171, each fixedly connected to the compression spring 16. The torque plate 15... A positioning post A152 is provided, and the other end of each compression spring 16 is fixedly connected to the positioning post A152. The torque plate 15 transmits torque and is elastically connected to the positioning plate 17 through the compression spring 16. The torque plate 15 has a rotating one-way tooth B151 machined on the side opposite to the torque plate 14, and the torque plate 14 has a rotating one-way tooth A142 machined on the side opposite to the torque plate 15. The rotating one-way tooth A142 and the rotating one-way tooth B151 make the torque plate 14 rotate only in one direction. The torque plate 14 is rotatably connected to the rotating sleeve 18.

[0027] The outer circle of the torque disk 14 is provided with several support plates 141. The support plates 141 are evenly arranged along the circumference of the torque disk 14. One of the support plates 141 supports the fixed cutting edge 12 to the outer boss 122 against the lower side of the inner protrusion 6011.

[0028] The hydrocyclone 7 has a cone 701 with a large upper diameter and a small lower diameter in the middle. The outer circle of the cone 701 is welded with a spiral blade 702. The hydrocyclone shroud 8 is a cone cylinder with a large upper diameter and a small lower diameter. The expansion tube 201 has several discharge holes 202 above the hydrocyclone shroud 8. The discharge holes 202 are evenly arranged along the circumference of the expansion tube 201. The rotation of the spiral blade 702 drives the incoming water flow into a swirling state. The centrifugal force of the swirling flow causes the incoming stones to spiral upward along the hydrocyclone shroud 8 and be discharged from the discharge holes 202. This can discharge most of the larger diameter stones (which are heavy) and further protect the blade.

[0029] The moving cutter 5 includes an inner sleeve 501, which is connected to the connecting lock cap 4 via a flat key A11. Three moving cutting edges 502 are welded to the outside of the inner sleeve 501. The moving cutting edges 502 are evenly arranged along the circumference of the inner sleeve 501. The moving cutting edges 502 have an arc-shaped strip structure and are machined with a front angle 503 and a back angle 504 for better cutting effect.

[0030] The torque plate 14 rotates toward the outer boss 122, and the support plate 141 tilts at an angle in the direction of rotation to support the fixed cutting edge 12. The bottom surface of the fixed cutting edge 12 has a gap 121 that can accommodate the support plate 141 rotating to support the fixed cutting edge 12 again.

[0031] When the moving blade 5 and the fixed cutting edge 12 are installed, there is a fixed gap to cut fibrous debris. The rotating moving blade 5 cuts the fibrous debris that enters with the water flow, preventing the fibrous debris from getting tangled on the impeller 1 and causing blockage.

[0032] Compression spring 16 keeps torque plate 15 and torque disk 14 in contact. Rotating one-way gears A142 and B151 transmit a fixed torque. Within this fixed torque range, torque disk 14 does not rotate, and support plate 141 supports fixed cutting edge 12. The fixed torque of torque clutch 22 can support fixed cutting edge 12 to cut fibrous debris. When a stone gets stuck between moving blade 5 and fixed cutting edge 12, fixed cutting edge 12 is subjected to great pressure, exceeding the fixed torque of torque clutch 22. Support plate 141 rotates and disengages from fixed cutting edge 12. Fixed cutting edge 12 rotates downward around hinge axis 24 and falls between the two support plates 141, as shown in the attached figure. Figure 6As shown, after the stone leaves, the pressure of the fixed cutting edge 12 disappears, and the torque disk 14 will rotate to the contact part of the next rotating one-way tooth A142 and rotating one-way tooth B151 under the action of the compression spring 16, that is, the next support plate 141 rotates to the part supporting the fixed cutting edge 12.

[0033] By incorporating a torque clutch 22 and a fixed cutting edge 12 that can rotate and fall around the hinge axis 24 in the fixed blade assembly 6, when incoming stones get stuck between the moving blade 5 and the fixed cutting edge 12, the part of the fixed cutting edge 12 that contacts the stone rotates and falls, preventing hard contact with the stone and thus protecting the blade from breakage and ensuring efficient pump operation. After the stone leaves, the torque clutch 22 can continue to position the fixed cutting edge 12 to cut fibrous debris. A vortex generator 7 is installed at the lower part of the moving blade 5 to drive the incoming water flow into a swirling state. The centrifugal force of the swirling flow causes the incoming stones to spiral upward along the vortex cover 8 and be discharged from the drain hole 202, which can discharge most of the larger diameter stones and further protect the blade. The arc-shaped moving cutting edge 502 makes point contact with the fixed cutting edge 12 during cutting, which improves the cutting efficiency.

Claims

1. A high-efficiency centrifugal pump, comprising a motor (3), an impeller (1), and a volute casing (2), characterized in that: The output shaft (301) of the motor (3) is connected to the impeller (1) via a flat key B (23). The output shaft (301) is axially positioned by a locking cap (4) threaded to the lower part of the impeller (1). The lower part of the locking cap (4) is connected to the moving knife (5) and the hydrocyclone (7) via a flat key A (11). The volute (2) has an expansion tube (201) with an enlarged diameter at the lower part of the suction port of the impeller (1). The lower part of the expansion tube (201) is connected to the hydrocyclone shroud (8) via bolts. The bottom of the hydrocyclone shroud (8) is connected to the positioning sleeve (9) via a support arm (10). The positioning sleeve (9) is rotatably connected to the hydrocyclone (7) via two bearings (19) and a spacer (20). The positioning sleeve (9) axially positions the hydrocyclone (7). The fixed knife assembly (6) is fixedly connected inside the expansion tube (201) via a set screw (21). The fixed blade assembly (6) includes an outer tube (603) and an inner tube (602). The outer tube (603) is fixedly connected to the expansion tube (201) by a set screw (21). The outer tube (603) and the inner tube (602) are fixedly connected to the outer frame (601) by bolts. There are three outer frames (601) evenly arranged around the circumference of the outer tube (603). The fixed cutting edge (12) and torque clutch (22) are installed inside the outer frame (601). The torque clutch (22) includes a square tube (13), the end of which is vertically fixed to the bottom of the outer frame (601). A positioning plate (17) and a rotating sleeve (18) are fixedly connected to the inner wall of the square tube (13). The positioning plate (17) and the rotating sleeve (18) are arranged coaxially. A compression spring (16), a torque plate (15), and a torque disk (14) are respectively installed between the positioning plate (17) and the rotating sleeve (18). The positioning plate (17) is provided with six circumferentially distributed positioning pins B (171). A compression spring (16) is fixedly connected. A positioning post A (152) is provided on the torque plate (15). The other end of each compression spring (16) is fixedly connected to the positioning post A (152). A rotating one-way tooth B (151) is machined on the side of the torque plate (14) relative to the torque plate (14). A rotating one-way tooth A (142) is machined on the side of the torque plate (15) relative to the torque plate (15). The rotating one-way tooth A (142) and the rotating one-way tooth B (151) make the torque plate (14) rotate only in one direction. The torque plate (14) is rotatably connected to the rotating sleeve (18). The outer circle of the torque disk (14) is provided with several support plates (141). The support plates (141) are evenly arranged along the circumference of the torque disk (14). One of the support plates (141) supports the fixed cutting edge (12) to the outer boss (122) against the lower side of the inner protrusion (6011).

2. The high-efficiency centrifugal pump according to claim 1, characterized in that: The upper part of the outer frame (601) is provided with a notch (6012), and the fixed cutting edge (12) is placed in the notch (6012). The fixed cutting edge (12) is rotatably connected to the outer frame (601) through the hinge shaft (24) in the direction of movement of the moving tool (5). The outer frame (601) is provided with an inner protrusion (6011) in the direction of movement of the moving tool (5), and the fixed cutting edge (12) is provided with an outer boss (122) in the direction of movement of the moving tool (5). The outer boss (122) is located below the fixed cutting edge (12), and the inner protrusion (6011) presses on the outer boss (122).

3. The high-efficiency centrifugal pump according to claim 1, characterized in that: The cyclone separator (7) has a cone (701) with a large upper diameter and a small lower diameter in the middle. The outer circle of the cone (701) is welded with a spiral blade (702). The cyclone shroud (8) is a cone with a large upper diameter and a small lower diameter. The expansion tube (201) has several drainage holes (202) above the cyclone shroud (8). The drainage holes (202) are evenly arranged along the circumference of the expansion tube (201).

4. A high-efficiency centrifugal pump according to claim 1, characterized in that: The moving tool (5) includes an inner sleeve (501), which is connected to the connecting lock cap (4) via a flat key A (11). Three moving cutting edges (502) are welded to the outside of the inner sleeve (501). The moving cutting edges (502) are evenly arranged along the circumference of the inner sleeve (501). The moving cutting edges (502) are arc-shaped strip structures, and the moving cutting edges (502) are machined with a front angle (503) and a back angle (504).

5. A high-efficiency centrifugal pump according to claim 2, characterized in that: The torque plate (14) rotates toward the outer boss (122), and the support plate (141) tilts at an angle in the direction of rotation to support the fixed cutting edge (12). The bottom surface of the fixed cutting edge (12) has a gap (121) that can accommodate the next support plate (141) to rotate to support the fixed cutting edge (12) again.

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