Centrifugal water pump magnetically connected with impeller

Abstract

The invention relates to a centrifugal water pump magnetically connected with an impeller. The centrifugal water pump is composed of a pump shell assembly and the like. The pump shell assembly comprises a front-end pump shell and a rear-end pump shell which are connected through a partition plate. A centrifugal cavity is formed in the front end of the front-end pump shell, a liquid inlet is formed in the front end of the front-end pump shell, a liquid outlet is formed in the side wall of the front-end pump shell, the centrifugal impeller rotates in the centrifugal cavity through the driving shaft, the impeller disc is a part of the centrifugal impeller, a sealing cavity is formed in the rear-end pump shell, and the driving shaft is rotationally connected to the two axial ends of the rear-end pump shell. The impeller disc and the driving shaft are fixed through a magnetic connection mechanism. The mechanism is provided with a driving disc fixed on the end face of a driving shaft and a driven disc coaxially fixed on the inner ring of an impeller disc, the driving disc and the driven disc are circumferentially matched through a jaw structure, a magnetic conductive ring is arranged on the inner side of the driving disc, and a permanent magnet ring is arranged on the inner side of the driven disc. One end of a magnetic force output assembly in the rear-end pump shell is connected to one side of the partition plate, the magnetic pole axis is parallel to the rotating shaft, macromolecule sealing blocks in an annular array are arranged on the partition plate, and magnetic force of the macromolecule sealing blocks is transmitted to the magnetic conducting ring through the sealing blocks.

Description

Technical Field

[0001] The present invention relates to a centrifugal water pump with a magnetically connected impeller, belonging to the field of fluid machinery. Background Art

[0002] In the field of sewage pumps, the properties of the conveyed fluids vary greatly, and the conditions of the objects contained therein are complex and changeable. The number and density of the blades of the centrifugal pump impeller are relatively fixed, making it difficult to flexibly adapt to this diversity. When the number of blades is large, when conveying fluids containing large or numerous particulate matters and viscous fluids, too many blades will generate a large viscous resistance, which will seriously reduce the driving efficiency. On the contrary, if the number of blades is small, when conveying fluids with low viscosity or small particulate matters, the contact area between the blades and the fluid is insufficient, resulting in low transfer efficiency of the impeller driving force to the fluid.

[0003] Currently, the common method to deal with different fluids is to replace different impellers. However, the impeller is usually fixed by static press-fitting, and the disassembly process takes a long time. Moreover, frequent static press-fitting operations will cause wear of the drive shaft, thereby affecting the concentricity and stability of the impeller, and reducing the overall performance and service life of the sewage pump. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the technical problems in the prior art and provide a centrifugal water pump with a magnetically connected impeller.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A centrifugal water pump with a magnetically connected impeller, comprising, A pump housing assembly, which includes a front pump housing and a rear pump housing that are sequentially connected to each other, and are separated by a partition plate between the front pump housing and the rear pump housing; Wherein, a centrifugal chamber is provided at the front end of the front pump housing, a liquid inlet is provided at the front end of the centrifugal chamber, a liquid outlet is provided on the side wall of the centrifugal chamber, the centrifugal impeller is rotationally connected to the centrifugal chamber through a drive shaft, the centrifugal impeller includes an impeller disc, a sealing chamber is provided in the rear pump housing, and the drive shaft is rotationally connected to both axial ends of the rear pump housing; The impeller disc and the drive shaft are fixedly connected through a magnetic connection mechanism; The magnetic connection mechanism includes a drive disc fixed to the end face of the drive shaft and a driven disc coaxially fixed to the inner ring of the impeller disc. The drive disc and the driven disc are circumferentially matched through a jaw structure, a magnetic conduction ring is provided inside the drive disc, and a permanent magnetic ring is provided inside the driven disc; The magnetic connection mechanism further includes a magnetic force output component arranged in the rear pump housing. One axial end of the magnetic force output component is fixedly connected to one side of the partition plate. The magnetic pole axis of the magnetic force output component is parallel to the axis of the rotating shaft. A number of sealing blocks made of polymer materials are arranged in a circular array on the partition plate. The magnetic force of the magnetic force output component passes through the sealing blocks and is output to the magnetic conductive ring.

[0006] As a further improvement of the present invention, a sealing mechanism is arranged on the outer ring of the partition plate corresponding to the sealing groove. The sealing mechanism includes a grinding component coaxially arranged on the outer ring of the rotating shaft and a sliding sealing component arranged on the inner ring of the grinding component. Among them, the grinding component includes a first grinding ring fixedly connected to the partition plate and a second grinding ring fixedly connected to the centrifugal impeller. A grinding gap is arranged between the first grinding ring and the second grinding ring. Among them, the sliding sealing component includes a first sealing ring fixedly connected to the partition plate and a second sealing ring fixedly connected to the centrifugal impeller. The first sealing ring and the second sealing ring are in sliding sealing contact. The grinding ring can grind and crush foreign objects sucked between the centrifugal impeller and the partition plate to prevent them from getting into between the driving disk and the driven disk, affecting the normal engagement between the driven disk and the driving disk and the normal rotation of the rotating shaft. At the same time, the sliding sealing component can not only further grind and crush fine particles, but also further ensure that impurities will not enter between the driving disk and the driven disk.

[0007] As a further improvement of the present invention, a number of first grinding protrusions are arranged in a circular array on the first grinding ring. The cross-section of the first grinding protrusion is a right triangle, and the right angle is located at the protruding end of the first grinding protrusion. The axis of the first grinding protrusion is located on the radial axis of the first grinding ring. The protruding height of the first grinding protrusion at the outer ring position of the first grinding ring is less than the protruding height of the first grinding protrusion at the inner ring position of the first grinding ring. A number of second grinding protrusions are arranged in a circular array on the second grinding ring. The cross-section of the second grinding protrusion is a right triangle, and the right angle is located at the protruding end of the second grinding protrusion. The axis of the second grinding protrusion is inclined relative to the radial axis of the second grinding ring. The protruding height of the second grinding protrusion at the outer ring position of the second grinding ring is less than the protruding height of the second grinding protrusion at the inner ring position of the second grinding ring. The grinding mechanism uses two groups of grinding protrusions with right-angle structures at a certain angle to cooperate with each other. Compared with grinding structures such as granular ones, the right-angle protrusion structure can effectively shear pollutants that are easy to entangle, and form a number of grinding protrusion intersection points through the arranged angle to further damage the sheared pollutants. At the same time, the grinding protrusions are arranged to incline inward, so that the flow velocity of the outer ring of the grinding mechanism is greater than that of the inner ring, making the pressure of the outer ring lower, allowing more impurities in the inner ring to be discharged into the outer ring, and reducing the probability of pollutants entering the driving shaft.

[0008] As a further improvement of the present invention, a sliding sleeve is fixedly connected inside the liquid inlet through a plurality of connecting plates. A sliding hole is provided inside the sliding sleeve. A thrust plate is connected inside the sliding hole through a spring. A spherical ceramic bead is fixedly provided in the middle of the thrust plate through a connecting pin. A driving shaft is coaxially fixed on the centrifugal impeller. A sliding bowl for sliding connection with the ceramic bead is provided at the end of the driving shaft; The front-end thrust structure can provide radial support and axial support for the front end of the centrifugal impeller, reduce the end vibration when the centrifugal impeller rotates, and at the same time, the magnetic connection mechanism provides redundancy to ensure that the centrifugal impeller will not fall off when the magnetic connection fails accidentally.

[0009] As a further improvement of the present invention, a sealing groove is provided on the side of the partition plate facing the centrifugal chamber. The driving disk and the driven disk are located in the sealing groove. A bottom sliding piece is provided at the bottom of the sealing groove. The bottom sliding piece is in sliding contact with the driving disk. A sealing block is located at the bottom of the sealing groove; The setting of the sealing groove reduces the contact area between the driving disk, the driven disk and the liquid in the centrifugal chamber, reduces the influence of pollutants on the magnetic connection mechanism, and at the same time, the sealing groove reduces the axial distance between the magnetic conduction ring and the magnetic force output component, improving the efficiency of magnetic connection.

[0010] As a further improvement of the present invention, an aluminum adapter plate is coaxially fixed on the impeller disk. The driven disk is fixedly connected to the adapter plate; The adapter plate can reduce the magnetic force influence of the permanent magnet ring and the magnetic conduction ring on the centrifugal impeller, prevent the centrifugal impeller from being magnetized and resulting in unstable rotation of the centrifugal impeller and the possibility of adhering impurities.

[0011] As a further improvement of the present invention, a first inlay groove is provided at one axial end of the driving disk. A pressing ring is fixed on the driving disk through tension bolts arranged in a circular array. A magnetic conduction ring is provided between the pressing ring and the bottom of the first inlay groove; a second inlay groove is provided at one axial end of the driven disk. The driven disk is fixed to the adapter plate through fixing bolts arranged in a circular array on the driven disk. A permanent magnet ring is provided between the adapter plate and the bottom of the second inlay groove; The magnetic conduction ring and the permanent magnet ring are fixed with bolts, which has higher stability compared to interference fit fixing or bonding fixing and will not become loose due to the rotation of the centrifugal impeller; moreover, it can ensure that the permanent magnet ring and the magnetic conduction ring are in a closed state, reducing the possibility of impurities adsorbing on the permanent magnet ring and the magnetic conduction ring.

[0012] As a further improvement of the present invention, a stepped shaft is provided at the front end of the driving shaft. A connecting ring is provided on the inner ring of the driving disk. The inner ring of the connecting ring is in fit connection with the outer wall surface of the stepped shaft through a keyway mechanism. A locking bolt is also coaxially fixed on the driving shaft. The connecting ring is pressed against the stepped end surface of the stepped shaft through the locking bolt; The drive disk uses a keyway mechanism and a locking bolt to cooperate with the drive shaft, which can ensure the axial limit while ensuring the stability of the circumferential driving force transmission.

[0013] As a further improvement of the present invention, a drive shaft is rotatably connected to the end of the rear pump housing. The drive shaft is connected to the driving shaft through a coupling. A bolt hole is provided through the driving shaft, and a locking nut is provided at the end of the driving shaft. The end of the locking bolt passes through the bolt hole and is fixed to the locking nut; the coupling includes a linkage disk fixedly connected to the driving shaft. The end of the driving shaft is a stepped shaft structure. The linkage disk sleeve is sleeved on the stepped shaft structure of the driving shaft through a keyway mechanism, and the locking nut presses on the end face of the linkage disk; The locking bolt is provided through, which ensures the strength of the hollow drive shaft. At the same time, the stable axial fixation between the coupling and the drive disk is realized through the locking bolt, reducing the possibility of axial sliding of the single keyway mating structure.

[0014] As a further improvement of the present invention, a rotating support column is integrally fixed in the middle of the partition plate, and the rotating shaft is rotatably connected in the rotating support column; a connecting sleeve is fixed through a flange on the outer ring of the partition plate corresponding to the support column, and the magnetic force output component is fixedly connected between the connecting sleeve and the rotating support column. The magnetic force output component includes a plurality of electromagnets fixedly arranged in an annular array between the connecting sleeve and the rotating support column. The electromagnet includes an iron core with an axis parallel to the axis of the rotating shaft, and windings are arranged on the iron core; a sealing cover plate is arranged between the rotating support column and the connecting sleeve. The electromagnet is sealed in the sealing cavity in the sealing cover plate, the partition plate, the rotating support column and the connecting sleeve. An internal connector is arranged on the sealing cover plate, and the internal connector is connected to an external connector arranged on the rear pump housing through a connecting wire; The rotating support column ensures the rotation support efficiency of the rotating shaft, shortens the cantilever length, and reduces the possibility of the rotating shaft swinging at the partition plate. The electromagnet further assists in structurally supporting the rotating support column, further improving the support strength; in addition, the electromagnet is coaxially arranged outside the rotating shaft, making the structure more compact, reducing the distance between the electromagnet and the magnetic conduction ring, and improving the magnetic force transmission efficiency.

[0015] The beneficial effects of the present invention are: The present invention realizes the combined fixation of the centrifugal impeller through magnetic connection, and at the same time realizes the circumferential fixation between the centrifugal impeller and the drive shaft through a jaw coupling structure. The acting axis of the magnetic force not only ensures the efficiency of the circumferential driving force conversion of the jaw coupling structure, but also ensures the stability of the coaxial fixation of the centrifugal impeller in the radial direction; compared with the original interference fit press-fitting fixation, it is easier to disassemble and replace according to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is a schematic cross-sectional view of the present invention; Figure 2 is Figure 1 a partial enlarged view of the position A in Figure 3 is a schematic structural view of the first grinding ring; Figure 4 is a schematic structural view of the second grinding ring; Figure 5 is a schematic structural view of the first sealing ring; Figure 6 is a schematic structural view of the second sealing ring; Figure 7 is a schematic structural view of the drive disk; Figure 8 is a schematic structural view of the driven disk.

[0018] In the figure: 1, rear end pump housing; 2, front end pump housing; 3, centrifugal chamber; 4, liquid inlet; 5, liquid outlet; 6, impeller disk; 7, centrifugal impeller; 8, adapter disk; 9, partition plate; 10, drive shaft; 11, drive disk; 12, driven disk; 13, locking bolt; 14, first grinding ring; 15, second grinding ring; 16, second sealing ring; 17, first sealing ring; 18, rotating support column; 19, connecting sleeve; 20, sealing cover plate; 21, iron core; 22, winding; 23, built-in connector; 24, external connector; 25, connecting plate; 26, sliding sleeve; 27, spring; 28, thrust plate; 29, ceramic bead; 30, push shaft; 31, linkage disk; 32, locking nut; 33, gasket; 34, transmission disk; 35, rear sealing plate; 36, transmission shaft; 37, end pump housing; 38, oil injection bolt; 39, pressure ring; 40, magnetic conduction ring; 41, permanent magnet ring; 42, first grinding projection; 43, second grinding projection. Detailed implementation manners

[0019] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0020] This embodiment describes a centrifugal water pump in which the impeller is drivingly connected to the drive shaft 10 by magnetic force.

[0021] As Figure 1 , the water pump mainly includes a pump housing assembly, and the pump housing assembly includes a front end pump housing 2, a rear end pump housing 1 and an end pump housing 37 that are fixedly connected in sequence through flanges; As Figure 1 and Figure 2, a centrifugal chamber 3 is provided inside the front pump housing 2, a centrifugal impeller 7 is provided inside the centrifugal chamber 3, and the centrifugal impeller 7 is used to drive the liquid to flow. A partition chamber is provided inside the rear pump housing 1, and a certain pressure of air is filled in the partition chamber. The pressure chamber is used to provide pressure to the seal at the centrifugal chamber 3 to reduce the possibility of liquid leakage from the pressure chamber. A seal chamber is provided inside the end pump housing 37, and seal oil is filled in the seal chamber.

[0022] As Figure 1 , wherein, a liquid inlet 4 is provided at the front end of the centrifugal chamber 3, a liquid outlet 5 is provided on the side wall of the centrifugal chamber 3, and the liquid inlet 4 and the liquid outlet 5 are communicated through the conical centrifugal chamber 3. The centrifugal impeller 7 is also conical and is coaxially rotatably connected to the inside of the centrifugal chamber 3. The front pump housing 2 and the rear pump housing 1 are separated and fixed by a partition plate 9 integrally provided at the front end of the rear pump housing 1. The conical bottom surface of the centrifugal chamber 3 is located on one side surface of the partition plate 9; a drive shaft 10 is rotatably connected to the middle of the partition plate 9, and the centrifugal impeller 7 and the drive shaft 10 are connected by a magnetic connection mechanism.

[0023] As Figure 1 and Figure 2 , a rotating support column 18 perpendicular to the partition plate 9 is integrally provided on the side of the partition plate 9 facing the rear pump housing 1. A stepped hole is provided in the middle of the rotating support column 18, and the drive shaft 10 is rotatably connected through a sealed bearing in the stepped hole; a connecting sleeve 19 is coaxially provided outside the rotating support column 18, and the connecting sleeve 19 is vertically fixed to the partition plate 9 through a flange structure. A seal chamber is provided between the connecting sleeve 19 and the rotating support column 18. The magnetic connection mechanism includes a magnetic force output component embedded in the seal chamber. The magnetic force output component includes a plurality of electromagnets arranged in an annular array. The iron core 21 of the electromagnet is arranged parallel to the axis of the rotating support column 18, the plane of the winding 22 is perpendicular to the axis of the rotating support column 18, and one side magnetic pole faces the axial end of the drive shaft 10; a seal cover plate 20 flange-connected to the rotating support column 18 is provided between the end faces of the rotating support column 18 and the connecting sleeve 19. Glue is poured between the rotating support column 18 and the connecting sleeve 19, and the seal cover plate 20 can reduce the influence of lubricating oil on the aging of the glue and at the same time achieve a certain degree of electromagnetic shielding. An internal connector 23 is provided on the seal cover plate 20, and the internal connector 23 is connected to an external connector 24 provided on the rear pump housing 1 through a connecting wire. The power supply of the electromagnet is supplied through the external connector 24.

[0024] As Figure 2 , a seal groove is provided on the side of the partition plate 9 facing the front pump housing 2. The magnetic connection mechanism further includes a drive disk 11 and a driven disk 12 provided in the seal groove. The driven disk 12 and the drive disk 11 are circumferentially matched through a jaw structure. As Figure 7 and Figure 8, a number of mutually engaged raised teeth are annularly arrayed on the surfaces of the driving disk 11 and the driven disk 12; as Figure 2 , wherein, a stepped shaft is provided at the front end of the driving shaft 10, a connecting ring is provided on the inner ring of the driving disk 11, and the inner ring of the connecting ring is in fit connection with the outer wall surface of the stepped shaft through a keyway mechanism. A locking bolt 13 is also coaxially fixed on the driving shaft 10, and the connecting ring is pressed against the stepped end surface of the stepped shaft by the locking bolt 13. The driving disk 11 is located at the bottom of the sealing groove, and a bottom sliding piece made of nylon is provided at the bottom of the sealing groove for sliding and sealing contact with the driving disk 11; as Figure 2 , wherein, a first inlay groove is provided at one axial end of the driving disk 11, a pressing ring 39 is fixed on the driving disk 11 by tightening bolts arranged in an annular array, and a magnetic conductive ring 40 is provided between the pressing ring 39 and the bottom of the first inlay groove; wherein, a number of sealing blocks made of nylon are annularly arrayed at the radial position of the partition plate 9 corresponding to the magnetic conductive ring 40, and the magnetic force of the electromagnet is transmitted to the magnetic conductive ring 40 through the sealing blocks. The number of the sealing blocks is less than the number of the electromagnets, and the diameter of the sealing blocks is greater than the diameter of the electromagnets; as Figure 2 , wherein, the centrifugal impeller 7 includes an impeller disk 6 and impeller vanes provided on the impeller disk 6. An aluminum adapter disk 8 is fixed on the back of the impeller disk 6, the driven disk 12 is fixedly connected to the adapter disk 8, a second inlay groove is provided at one axial end of the driven disk 12, and the driven disk 12 is fixed to the adapter disk 8 by fixing bolts arranged in an annular array. A permanent magnetic ring 41 is provided between the adapter disk 8 and the bottom of the second inlay groove; the permanent magnetic ring 41 and the magnetic conductive ring 40 attract each other, thereby driving the axial engagement between the driving disk 11 and the driven disk 12, and realizing the transmission between the centrifugal impeller 7 and the driving shaft 10.

[0025] As Figure 1 And Figure 2 , a sealing mechanism is further provided at the outer ring position of the impeller disk 6 corresponding to the adapter disk 8. The sealing mechanism includes a grinding component coaxially arranged on the outer ring of the rotating shaft and a sliding sealing component arranged on the inner ring of the grinding component; wherein, the grinding component includes a first grinding ring 14 fixedly connected to the partition plate 9 and a second grinding ring 15 fixedly connected to the impeller disk 6, and a grinding gap is provided between the first grinding ring 14 and the second grinding ring 15; wherein, as Figure 3 , a number of first grinding protrusions 42 are annularly arrayed on the first grinding ring 14. The cross section of the first grinding protrusion 42 is a right triangle, the right angle is located at the protruding end of the first grinding protrusion 42, and the axis of the first grinding protrusion 42 is located on the radial axis of the first grinding ring 14; the protruding height of the first grinding protrusion 42 at the outer ring position of the first grinding ring 14 is less than the protruding height of the first grinding protrusion 42 at the inner ring position of the first grinding ring 14; as Figure 4, a plurality of second grinding protrusions 43 are annularly arrayed on the second grinding ring 15. The cross-section of the second grinding protrusion 43 is a right triangle, and the right angle is located at the protruding end of the second grinding protrusion 43. The axis of the second grinding protrusion 43 is inclined relative to the radial axis of the second grinding ring 15; the protruding height of the second grinding protrusion 43 at the outer ring position of the second grinding ring 15 is less than the protruding height of the second grinding protrusion 43 at the inner ring position of the second grinding ring 15; wherein, as Figure 1 , Figure 2 , Figure 5 and Figure 6 , the sliding seal assembly includes a first seal ring 17 fixedly connected to the partition plate 9 and a second seal ring 16 fixedly connected to the impeller disc 6. A rough sliding contact surface is provided on the surfaces of the first seal ring 17 and the second seal ring 16, and the first seal ring 17 is in sliding seal contact with the second seal ring 16.

[0026] As Figure 1 , a sliding sleeve 26 is fixedly connected in the liquid inlet 4 through a plurality of connecting plates 25. A sliding hole is provided in the sliding sleeve 26. A thrust plate 28 is connected in the sliding hole through a spring 27. A spherical ceramic bead 29 is fixedly provided in the middle of the thrust plate 28 through a connecting pin. A pushing shaft 30 is coaxially fixed on the centrifugal impeller 7, and a sliding bowl for sliding connection with the ceramic bead 29 is provided at the end of the pushing shaft 30.

[0027] As Figure 1 , in addition, a rear seal plate 35 is fixedly sealed between the rear pump housing 1 and the end pump housing 37 through a flange. A transmission shaft 36 penetrating the end pump housing 37 is rotatably connected in the middle of the rear seal plate 35. The transmission shaft 36 is also rotatably connected to the end of the end pump housing 37. The transmission shaft 36 is used to connect to a power source, and lubricating oil is added into the rear pump housing 1 through an oil injection bolt 38; the transmission shaft 36 and the drive shaft 10 are connected through a coupling. A bolt hole is provided through the drive shaft 10. A locking nut 32 is provided at the end of the drive shaft 10. The end of the locking bolt 13 passes through the bolt hole and is fixed to the locking nut 32; the coupling includes a linkage disc 31 fixedly connected to the drive shaft 10 and a transmission disc 34 fixedly connected to the transmission shaft 36. The end of the drive shaft 10 is a stepped shaft structure. The linkage disc 31 is sleeved on the stepped shaft structure of the drive shaft 10 through a keyway mechanism. The locking nut 32 is pressed against the end face of the linkage disc 31 through a gasket 33.

[0028] During use, as Figure 1, during the preparation process, first start the electromagnet with a low current, pre-fix the centrifugal impeller 7 through the low magnetic force between the magnetic conduction ring 40 and the permanent magnetic ring 41. Subsequently, install the front pump housing 2, insert the push shaft 30 at the front end of the centrifugal impeller 7 into the sliding sleeve 26, embed the ceramic beads 29 into the sliding bowl, and lock the front pump housing 2 through the flange. Then increase the current to lock the centrifugal impeller 7. During the rotation of the centrifugal impeller 7, since the number of sealing blocks is less than the number of electromagnets, it can ensure that there is always the magnetic force of an electromagnet passing through the sealing block to attract the magnetic conduction ring 40 and ensure the strength of the partition plate 9. After the preparation is completed, the driving disk 11 and the driven disk 12 are engaged with each other through the jaw structure to achieve driving transmission; during the working process, the conveying medium is input from the liquid inlet 4 and contacts the impeller blades of the centrifugal impeller 7. Under the action of the rotational driving force of the impeller blades perpendicular to the rotational path of the impeller blades, the fluid rotates, the linear velocity increases, and along with the inclination angle of the impeller blades and the radial axis, under the action of the centrifugal force, it moves to the periphery of the centrifugal chamber 3 and is discharged through the liquid outlet 5. At the same time, most of the impurities will be discharged along with the fluid, while some impurities or fluid carry-ons will enter the gap between the impeller disk 6 and the partition plate 9. At this time, the impurities will enter the gap between the first grinding ring 14 and the second grinding ring 15. Subsequently, the impurities will be continuously sheared and crushed between the first grinding protrusion 42 of the first grinding ring 14 and the second grinding protrusion 43 of the second grinding ring 15. The first grinding protrusion 42 and the second grinding protrusion 43 are arranged obliquely to the horizontal plane, so that the surface roughness of the inner circle of the first grinding ring 14 is higher than that of the outer circle of the first grinding ring 14, and the same is true for the second grinding ring 15. This results in a low flow rate due to the high roughness, and the flow rate difference brings a fluid pressure difference, making the fluid pressure in the inner circle of the grinding ring greater than the fluid pressure in the outer circle of the grinding ring. Through the pressure difference, most of the crushed debris after grinding can be continuously discharged to the periphery of the first grinding ring 14 and the second grinding ring 15, while the other part of the debris will be blocked by the first sealing ring 17 and the second sealing ring 16. Only a small part of the debris will enter between the first sealing ring 17 and the second sealing ring 16 and be ground into extremely small particle sizes by the first sealing ring 17 and the second sealing ring 16, eliminating the possibility of impurities winding around the driving shaft 10 and also eliminating the influence of impurities on the rotation of the bearing; when it is necessary to replace the centrifugal impeller 7, the front pump housing 2 can be removed and the circuit of the electromagnet can be turned off to achieve the replacement of the centrifugal impeller 7. Due to the existence of the entire sealing mechanism, there will not be many difficult-to-remove impurities between the driving disk 11 and the driven disk 12, improving the replacement efficiency and also improving the coupling efficiency of the driving disk 11 and the driven disk 12.

[0029] Inspired by the above-described ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A centrifugal water pump with a magnetically connected impeller, comprising: A pump casing assembly, the pump casing assembly comprising a front pump casing (2) and a rear pump casing (1) which are connected to each other in sequence, and the front pump casing (2) and the rear pump casing (1) are separated by a partition plate (9); in, A centrifugal chamber (3) is provided at the front end of the front pump housing (2), a liquid inlet (4) is provided at the front end of the centrifugal chamber (3), a liquid outlet (5) is provided on the side wall of the centrifugal chamber (3), a centrifugal impeller (7) is rotatably connected to the centrifugal chamber (3) via a drive shaft (10), the centrifugal impeller (7) includes an impeller disc (6), a sealing chamber is provided in the rear pump housing (1), and the drive shaft (10) is rotatably connected to both axial ends of the rear pump housing (1); The feature is that the impeller disk (6) and the drive shaft (10) are fixedly connected via a magnetic connection mechanism; The magnetic connection mechanism comprises a driving disk (11) fixed to the end surface of the driving shaft (10) and a driven disk (12) coaxially fixed to the inner ring of the impeller disk (6); the driving disk (11) and the driven disk (12) are circumferentially matched via a tooth-embedded structure; a magnetic conductive ring (40) is provided on the inner side of the driving disk (11), and a permanent magnetic ring (41) is provided on the inner side of the driven disk (12); The magnetic connection mechanism also includes a magnetic output component arranged in the rear end pump housing (1), one axial end of the magnetic output component is fixedly connected to one side of the partition plate (9), the magnetic pole axis of the magnetic output component is parallel to the axis of the rotating shaft, and a plurality of sealing blocks made of polymer materials are arranged in an annular array on the partition plate (9), and the magnetic force of the magnetic output component is output to the magnetic conductive ring (40) through the sealing block.

2. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A sealing mechanism is provided on the outer ring of the partition plate (9) corresponding to the sealing groove, and the sealing mechanism comprises a grinding assembly coaxially arranged on the outer ring of the rotating shaft and a sliding sealing assembly arranged on the inner ring of the grinding assembly; wherein the grinding assembly comprises a first grinding ring (14) fixedly connected to the partition plate (9) and a second grinding ring (15) fixedly connected to the centrifugal impeller (7), and a grinding gap is provided between the first grinding ring (14) and the second grinding ring (15); wherein the sliding sealing assembly comprises a first sealing ring (17) fixedly connected to the partition plate (9) and a second sealing ring (16) fixedly connected to the centrifugal impeller (7), and the first sealing ring (17) and the second sealing ring (16) are in sliding sealing contact.

3. A centrifugal water pump with a magnetically connected impeller as claimed in claim 2, characterized in that: A plurality of first grinding protrusions (42) are arranged in an annular array on the first grinding ring (14); the cross section of the first grinding protrusion (42) is a right triangle, the right angle is located at the protruding end of the first grinding protrusion (42), and the axis of the first grinding protrusion (42) is located on the radial axis of the first grinding ring (14); the protrusion height of the first grinding protrusion (42) at the outer ring position of the first grinding ring (14) is smaller than the protrusion height of the first grinding protrusion (42) at the inner ring position of the first grinding ring (14); a plurality of second grinding protrusions (43) are arranged in an annular array on the second grinding ring (15); the cross section of the second grinding protrusion (43) is a right triangle, the right angle is located at the protruding end of the second grinding protrusion (43), and the axis of the second grinding protrusion (43) is arranged obliquely relative to the radial axis of the second grinding ring (15); the protrusion height of the second grinding protrusion (43) at the outer ring position of the second grinding ring (15) is smaller than the protrusion height of the second grinding protrusion (43) at the inner ring position of the second grinding ring (15).

4. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A sliding sleeve (26) is fixedly connected to the liquid inlet (4) via a plurality of connecting plates (25), a sliding hole is provided in the sliding sleeve (26), a thrust plate (28) is connected to the sliding hole via a spring (27), a spherical ceramic bead (29) is fixed to the middle of the thrust plate (28) via a connecting pin, a driving shaft (30) is coaxially fixed to the centrifugal impeller (7), and a sliding bowl for sliding connection with the ceramic bead (29) is provided at the end of the driving shaft (30).

5. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A sealing groove is provided on the side of the partition plate (9) facing the centrifugal chamber (3), the driving disc (11) and the driven disc (12) are located in the sealing groove, a bottom sliding sheet is provided at the bottom of the sealing groove, the bottom sliding sheet is in sliding contact with the driving disc (11), and a sealing block is located at the bottom of the sealing groove.

6. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: An aluminum adapter plate (8) is coaxially fixed on the impeller plate (6), and the driven plate (12) is fixedly connected to the adapter plate (8).

7. A centrifugal water pump with a magnetically connected impeller as claimed in claim 6, characterized in that: A first embedding groove is provided at one axial end of the driving disk (11); a pressure ring (39) is fixed to the driving disk (11) by means of tension bolts arranged in an annular array; a magnetic conductive ring (40) is provided between the pressure ring (39) and the bottom of the first embedding groove; a second embedding groove is provided at one axial end of the driven disk (12); the driven disk (12) is fixed to the adapter disk (8) by means of fixing bolts arranged in an annular array; a permanent magnetic ring (41) is provided between the adapter disk (8) and the bottom of the second embedding groove.

8. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A stepped shaft is arranged at the front end of the drive shaft (10), and a connecting ring is arranged on the inner ring of the drive disc (11). The inner ring of the connecting ring and the outer wall surface of the stepped shaft are connected by a keyway mechanism. A locking bolt (13) is coaxially fixed to the drive shaft (10), and the connecting ring is pressed onto the stepped end surface of the stepped shaft by the locking bolt (13).

9. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A transmission shaft (36) is rotatably connected to the rear end of the rear pump housing (1), and the transmission shaft (36) is connected to the drive shaft (10) via a coupling. A bolt hole is provided in the drive shaft (10), and a locking nut (32) is provided at the end of the drive shaft (10). The end of the locking bolt (13) passes through the bolt hole and is fixed to the locking nut (32). The coupling comprises a linkage disk (31) fixedly connected to the drive shaft (10), and the end of the drive shaft (10) is a stepped shaft structure. The linkage disk (31) is sleeved on the stepped shaft structure of the drive shaft (10) via a keyway mechanism, and the locking nut (32) is pressed against the end surface of the linkage disk (31).

10. A centrifugal water pump with a magnetically connected impeller as claimed in claim 1, characterized in that: A rotating support column (18) is integrally fixed to the middle of the partition plate (9), and the rotating shaft is rotatably connected to the rotating support column (18); a connecting sleeve (19) is fixed to the outer ring of the supporting column corresponding to the partition plate (9) through a flange, and a magnetic output assembly is fixedly connected between the connecting sleeve (19) and the rotating support column (18), and the magnetic output assembly includes a plurality of electromagnets in an annular array fixed between the connecting sleeve (19) and the rotating support column (18), and the electromagnet includes an iron core (21) whose axis is parallel to the axis of the rotating shaft, and a winding (22) is arranged on the iron core (21); a sealing cover plate (20) is arranged between the rotating support column (18) and the connecting sleeve (19), and the electromagnet is sealed in a sealing cavity in the sealing cover plate (20), the partition plate (9), the rotating support column (18) and the connecting sleeve (19), and a built-in connector (23) is arranged on the sealing cover plate (20), and the built-in connector (23) is connected to an external connector (24) arranged on the rear end pump housing (1) through a connecting line.

Images