A large flow fluoroplastic magnetic pump

Abstract

The technical solution of the present invention is achieved as follows: a large-flow fluoroplastic magnetic pump includes a pump body, an impeller, a main shaft, a bearing, a central shaft seat, a rotor body, an external magnetic assembly and a spacer assembly, wherein a shaft sleeve is provided on the central shaft seat, and the shaft sleeve is coaxially installed with the bearing; a magnetic sealing ring is provided on the external magnetic assembly, and a groove is provided on the surface of the rotor body; the present invention has the characteristics of high installation accuracy, compact structure, reasonable design, high installation accuracy, high operating temperature, etc., and can withstand large flow operation.

Description

Technical Field

[0001] The invention relates to a pump, in particular to a large-flow fluoroplastic magnetic pump. Background Art

[0002] At present, there is a blank in the domestic chemical industry for high-temperature resistant and corrosion-resistant fluoroplastic magnetic pumps. General fluoroplastic centrifugal pumps (mechanical seals) use external cooling water, have a service life of less than 3 months, and have many problems, such as: structural design defects, unstable and easy deformation of the sealing surface, low pressure resistance, and generally use temperatures below 70°C; unstable operation, short service life, and magnetic transmission components using ferrite, which has low magnetic properties, small torque, and large size; although imported fluoroplastic magnetic pumps can meet user requirements, they are not accepted by domestic manufacturers due to high prices, expensive maintenance costs, and long supply cycles of imported parts, and users rarely choose them.

[0003] More and more manufacturers require a leak-free process environment for the media they transport. In some special occasions, such as transporting hot oil or media with particles (such as sewage treatment), as well as in chemical production processes, there is an urgent need to choose an ideal leak-free pump type.

[0004] The current structure of the fluoroplastic magnetic pump in China is: a pump body static ring is assembled on the pump body; the impeller inlet end and back are equipped with an impeller dynamic ring, called the impeller; the rotor body and the main shaft are assembled, called the rotor assembly; the sliding bearing and the isolation sleeve are assembled, and the back of the isolation sleeve is assembled with the reinforcement sleeve, called the isolation assembly; the sliding bearing and the central shaft seat are assembled; the bracket is connected to the motor; the external magnet is assembled to the motor main shaft; the rotor assembly is assembled to the central shaft seat, and the impeller and the impeller nut are assembled to the main shaft of the rotor assembly; then the isolation assembly is assembled to the central shaft seat, the pump body and the sealing ring are assembled to the central shaft seat, and the central shaft seat is assembled to the bracket.

[0005] In summary, and through years of use and testing, it is found that the existing fluoroplastic magnetic pumps have the following problems:

[0006] (1) Since the gap between the rotor body and the isolation sleeve is very small, generally 1mm, when the pump is used at a medium temperature above 70℃, the plastic expands and the rotating rotor body will scratch the isolation sleeve, affecting the normal operation of the magnetic pump.

[0007] (2) The sliding bearing is assembled with the center shaft seat and the isolation sleeve. The isolation sleeve is a plastic part and is assembled on the center shaft seat. In this way, the coaxiality of the two sliding bearings cannot be guaranteed, causing the rotor body to be not on the center axis of the pump, increasing the noise and vibration of the pump.

[0008] (3) The magnetic leakage of the external magnet of the magnetic pumps sold on the domestic market is between 200 and 300 gauss, and the highest is over 400 gauss. When the motor starts and the rotating magnetic field is cut by the metal, a large amount of magnetic leakage will generate magnetic eddy currents, which in turn will generate high temperature (doing useless work), which not only reduces the efficiency of the magnetic pump, but also shortens the service life of the magnetic pump under high temperature working conditions. Moreover, the magnetic materials used in the rotor body and external magnet of the domestic magnetic pump are all ferrites, which have low torque transmission capacity. If the density of the conveying medium exceeds 1.2, it will slip and fail to work.

[0009] (4) The impeller nut, impeller and main shaft are assembled. The impeller is pressed firmly by the impeller nut. Due to the accidental reverse rotation of the pump, the impeller nut may become loose, causing the impeller to move or detach from the main shaft. Summary of the Invention

[0010] In view of the shortcomings of the prior art, the present invention aims to provide a large-flow fluoroplastic magnetic pump.

[0011] The technical solution of the present invention is achieved as follows: a large-flow fluoroplastic magnetic pump, comprising a pump body, a pump chamber provided on the pump body and for material movement, an impeller movable in the pump chamber, and a driving device for driving the impeller to rotate and having a rotating shaft connected to the impeller, characterized in that it includes a central axis module installed with the pump body and matched with the rotating shaft and having at least two matching points with the rotating shaft.

[0012] Preferably, the central axis module includes a central axis seat, a transmission cavity provided in the central axis seat and having a transmission cavity for movement of the rotating shaft, and at least one bearing installed in the transmission cavity and matched with the rotating shaft.

[0013] Preferably, it also includes a sleeve provided on the mating surface of the bearing and the transmission cavity, and the sleeve is coaxially installed with the bearing; the material of the sleeve and the bearing is pressureless sintered silicon carbide (SSic); the sleeve and the bearing are both pressureless sintered silicon carbide (SSic) sintered at a high temperature of 2100°C, and have the characteristics of high temperature resistance, strong corrosion resistance, excellent hardness and good wear resistance.

[0014] Preferably, a limiting groove for mounting the bearing is provided on the transmission cavity, and the bearing is mounted by correspondingly engaging with the limiting groove during installation.

[0015] Preferably, the impeller comprises an impeller body provided with an internally threaded blind hole, the impeller body is connected to the output end of the rotating shaft through the internally threaded blind hole, the outer surface of the impeller is covered with a plastic layer, and no plastic layer is provided at the threaded connection.

[0016] Preferably, the internal threaded blind hole on the impeller and the mating surface of the rotating shaft are filled with glue.

[0017] Preferably, the water receiving surface of the impeller is arc-shaped.

[0018] Preferably, the driving device includes a rotor body connected to the rotating shaft, an external magnetic assembly for driving the rotor body to rotate and controlled by a motor, and an isolation assembly arranged between the rotor body and the external magnetic assembly, wherein the isolation assembly includes an isolation sleeve and a reinforcement sleeve.

[0019] Preferably, the rotor body is a fluoroplastic-wrapped magnetic steel, the surface of the rotor body is a plastic layer wrapped with fluoroplastic, a groove is provided on the surface of the rotor body, and multiple grooves are processed on the inlay surface of the rotor body, that is, the surface of the plastic layer. The groove includes a dovetail groove and a through hole, and the through hole is provided at a location where the groove is not easy to be processed. The groove is used to improve the heat dissipation effect of the rotor body, reduce the deformation and expansion of the plastic layer, and at the same time increase the lateral expansion space of the plastic layer to reduce the outward expansion of the plastic layer.

[0020] Preferably, the external magnetic assembly includes a magnet mounting frame and an external magnet arranged on the inner side wall of the magnet mounting frame; the external magnetic assembly is provided with a magnetic sealing ring, which can reduce magnetic leakage by blocking the magnetic flux lines of the external magnet; the magnetic sealing ring is arranged on the inner side of the magnet mounting frame and in contact with the external magnet; the magnetic materials used for the magnets in the rotor body and the external magnets are both rare earth samarium cobalt, which has the characteristics of strong magnetism and high temperature resistance, and can transmit sufficiently large torque.

[0021] The beneficial effects of the present invention are:

[0022] (1) Through holes and process grooves are processed on the surface of the rotor insert. When heated at high temperatures, the process grooves and through holes can improve the heat dissipation effect. At the same time, lateral expansion space is provided for the plastic layer to prevent the plastic layer from expanding outward due to heat, thereby reducing the deformation of the plastic layer on the surface of the rotor body and preventing the expansion and deformation of the plastic layer from contacting and scratching the isolation sleeve, thereby ensuring the stable operation of the magnetic pump.

[0023] (2) By assembling two sliding sleeves on the central shaft seat, corresponding to the two bearings, the impeller and the rotor body are installed at both ends of the main shaft, and the central shaft seat and the impeller are assembled, and the spacer assembly is connected to the central shaft seat, thereby improving the installation accuracy and ensuring the stable installation of the rotor body; compared with the existing assembly of the central shaft seat, the sliding bearing and the spacer assembly, the assembly method of multiple fulcrums is changed to installation on the same main shaft, with one axis as the reference, thereby improving the coaxiality, reducing the offset of components due to different coaxiality, improving the installation accuracy, and avoiding the two sliding bearings failing to ensure coaxiality during operation, resulting in the rotor body being not on the central axis of the pump, thereby increasing the noise and vibration of the pump.

[0024] (3) By setting a magnetic sealing ring on the external magnetic assembly, magnetic leakage is reduced, magnetic eddy currents generated by leakage magnetic field are eliminated, and the isolation assembly is protected from damage caused by magnetic eddy currents.

[0025] (4) The main shaft is connected to the impeller and rotor through metal threads, and is set to a non-fully wrapped plastic layer to ensure that the stress-bearing surfaces of the main shaft, impeller and rotor body are not on the plastic layer, avoiding the phenomenon that the plastic layer at the connection is easily deformed during rotation, causing slipping and scratching; at the same time, the connection between the main shaft and the impeller does not contain an impeller nut, and glue is used to reinforce the metal thread to avoid accidental reverse rotation during the operation of the pump, which may cause the impeller nut to loosen, resulting in the impeller displacement or separation from the main shaft, thereby ensuring the stability of the impeller operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a transmission assembly in a specific embodiment of the present invention;

[0029] Figure 3 It is a general assembly drawing of a specific embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of an external magnetic assembly in a specific embodiment of the present invention;

[0031] Figure 5 This is a diagram showing the position of the slot on the rotor body in a specific embodiment of the present invention;

[0032] Figure 6 This is a schematic structural diagram of an impeller in a specific embodiment of the present invention;

[0033] Figure 7 This is a structural diagram of a glue injection groove in a specific embodiment of the present invention;

[0034] The example in the figure is: 1. Pump body, 2. Impeller, 3. Main shaft, 4. Sealing ring, 5. Bearing, 6. Bushing, 7. Middle shaft seat, 8. Isolation sleeve, 9. Reinforcement sleeve, 10. Pressure plate, 11. Rotor body, 12. External magnetic assembly, 121. Magnet mounting frame, 122. External magnet, 13. Bracket, 14. Adjusting ring, 15. O-ring, 16. Motor, 17. Magnetic sealing ring, 18. Tank body, 19. Glue injection hole, 20. Glue injection groove. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1 As shown, the present invention discloses a large-flow fluoroplastic magnetic pump. In a specific embodiment of the present invention, it includes a pump body 1, an impeller 2, a main shaft 3, a bearing 5, a central shaft seat 7, a rotor body 11, an external magnetic assembly 12 and a spacer assembly. The spacer assembly includes an isolation sleeve 8 and a reinforcement sleeve 9. A shaft sleeve 6 is provided on the central shaft seat 7, and the shaft sleeve 6 is coaxially installed with the bearing 5; a bearing 5 that can be assembled with the impeller 2 is provided on the main shaft 3, and the bearing 5 can be installed on the main shaft 3 with a tight fit on the back of the impeller 2, and the central shaft seat 7 can be installed with a tight fit on the impeller 2.

[0038] At the same time, a bracket 13 is provided outside the external magnetic assembly 12, and a bolt hole for assembling with the motor 16 is provided on the end of the bracket 13 away from the impeller 2. The bracket 13 is also provided with a large concave stop connected to the central shaft seat 7 and the pump body 1.

[0039] like Figure 2 As shown, there are two bearings 5, and there are two corresponding limiting grooves on the central axis seat. During installation, the shaft sleeve is first installed in the limiting groove and then the bearing is installed in conjunction with the shaft sleeve and the limiting groove. An adjusting ring 14 is provided between the two sliding bearings 5; a shaft sleeve 6 is provided on the bearing 5, and the shaft sleeve 6 can be fitted with the central axis seat 7. During assembly, after the main shaft is installed, the bearing 5 is assembled with the impeller, and then the adjusting ring 14 is installed, and then the central axis seat 7 with the sliding sleeve 6 installed is installed with the impeller. At this time, the sleeve 6 is fitted with the bearing, and then the second bearing is inserted and installed, and finally the rotor body 11 is installed; the central axis seat forms a fitting point through the installation of two bearings and sleeves to ensure the coaxial installation of the central axis seat and the main shaft; the subsequent spacer assembly is directly assembled on the central axis seat, reducing the installation and coordination with the main shaft, and changing the installation point of the spacer assembly from the existing two end installations to only cooperating with the central axis seat, reducing the installation and coordination points, and ensuring the coaxiality of the spacer assembly.

[0040] The material of the sleeve 6 and the bearing 5 is pressureless sintered silicon carbide (SSic); the sleeve 6 and the bearing 5 are both pressureless sintered silicon carbide (SSic) sintered at a high temperature of 2100°C, which has the characteristics of high temperature resistance, strong corrosion resistance, excellent hardness and good wear resistance.

[0041] The water-receiving surface of the impeller is set to an arc shape. Setting the water-receiving surface of the impeller to an arc surface enhances the structural strength of the impeller and enhances the pressure resistance of the impeller. When impacted by water, the arc surface of the impeller evenly disperses the force of the water, thereby ensuring the normal operation of the impeller and extending the service life of the impeller.

[0042] In this embodiment, the impeller 2 and the rotor body 11 are both made of a non-fully wrapped plastic layer. The impeller 2 is connected to the main shaft by a thread, and the connection is at the part where the impeller 2 is not wrapped with the plastic layer. The impeller 2 and the main shaft 3 are connected by a metal thread. The impeller 2 is made of a metal matrix wrapped with fluoroplastic, and the main shaft 3 is directly connected to the metal matrix of the impeller 2 by a thread. There is no plastic layer at this connection, which avoids the stress surface of the main shaft and impeller being deformed, slipped or scratched on the plastic layer when the impeller rotates. The metal thread connection makes the connection between the impeller and the main shaft increasingly tighter as the impeller rotates, and the stability is enhanced. A sealing ring 4 is provided between the impeller and the main shaft.

[0043] The connection between the impeller 2 and the main shaft 3 is also bonded, and 326 structural glue is used for bonding and reinforcement at the same time as the threaded connection. Compared with the previous method of using an impeller nut to assemble the impeller and the main shaft, the metal threaded connection between the main shaft and the impeller and the glue bonding are used to avoid the impeller nut loosening and causing the impeller to deviate or detach from the main shaft when the pump is accidentally reversed. At the same time, the front of the impeller can be wrapped with a full plastic layer and a curved surface setting to enhance the structural strength of the impeller's stress-bearing surface and improve the stability of the pump operation.

[0044] The main shaft 3 and the rotor body 11 are connected by metal threads, and a non-fully wrapped plastic layer is used on the surface of the rotor body 11. The installation method of the main shaft and the impeller is consistent with that of the main shaft and the impeller, and the main shaft is connected through a threaded blind hole on the impeller. External threads are provided at both ends of the main shaft, which are respectively connected to the impeller and the rotor body 11; an O-ring 15 is provided between the rotor body 11 and the main shaft.

[0045] like Figure 4As shown, in this embodiment, the outer magnetic assembly 12 is provided with a magnetic sealing ring 17, and a pressure plate 10 is provided between the outer magnetic assembly 12 and the partition assembly, and the partition assembly is fixed by the pressure plate, the central axis seat and the external bracket. The outer magnetic assembly 12 includes a magnet mounting frame 121 and an outer magnet 122 arranged on the inner side wall of the magnet mounting frame 121. The inner side wall of the magnet mounting frame 121 is provided with a mounting groove for mounting the outer magnet 122, and the outer magnet 122 is mounted in the mounting groove. The magnetic sealing ring 17 is arranged near the magnet mounting frame 121. One end of the pressure plate is in contact with the external magnet 122, and the inner ring diameter of the magnetic sealing ring 17 is smaller than the linear distance relative to the external magnet 122. By setting the magnetic sealing ring 17, the magnetic sealing ring 17 is added to the leakage surface of the external magnet 122. When working, the magnetic flux lines are blocked from diverging to the outside, the magnetic leakage of the external magnet is greatly reduced, the generation of magnetic eddy currents is avoided to affect the total isolation, and the stability of the magnetic pump is ensured; the external magnetic magnetic leakage is between 20 and 30 gauss, which is 90% lower than the magnetic leakage of the existing magnetic pump.

[0046] The magnetic material used in the rotor body 11 and the external magnetic assembly 12 is rare earth samarium cobalt, which has the characteristics of strong magnetism and high temperature resistance, and can transmit sufficiently large torque.

[0047] like Figure 5 As shown, in this embodiment, a groove body 18 is opened on the surface of the rotor body 11, and the rotor body 11 is a fluoroplastic-wrapped magnetic steel. A plurality of dovetail grooves and through holes are processed on the inlay surface of the rotor body 11. When the rotor body is heated, the dovetail grooves and through holes provide heat dissipation space to enhance the heat dissipation effect. At the same time, the fluoroplastic on the surface of the rotor body expands due to heat, and the arrangement of the groove body and the through holes provides space for the lateral expansion of the fluoroplastic, thereby reducing the outward deformation and expansion of the fluoroplastic layer and the possibility of scratching the isolation sleeve. The isolation sleeve includes an isolation sleeve and a reinforcement sleeve. At the same time, the metal thread design of the rotor and the main shaft solves the problem of expansion and deformation of fluoroplastic at high temperature, ensures the stable performance of the fluoroplastic magnetic centrifugal pump under high temperature working conditions, and increases the operating temperature of the fluoroplastic magnetic pump from 70°C to about 165°C.

[0048] The material of the sliding sleeve and sliding bearing is SSic pressureless sintered silicon carbide, which is sintered at a high temperature of 2100℃. It has the characteristics of high temperature resistance, strong corrosion resistance, excellent hardness and good wear resistance. During the installation process, the bearing is installed tightly on the back of the impeller, and an adjusting ring made of polytetrafluoroethylene is installed at the front end of the bearing. First, the sleeve and the middle shaft seat are installed and assembled, and then the middle shaft seat with the assembled sleeve is installed on the impeller. Then, the second bearing is installed tightly, and finally the thread of the rotor body is tightened with the thread of the impeller. The connection of the metal thread ensures sufficient torque transmission, completes the assembly of the main transmission components, and ensures that its axial stringing is between 0.1mm and 0.05mm. The installation size of the sleeve on the middle shaft seat is fixed, and the axial stringing clearance is controlled by the adjusting ring to meet the required clearance. At the same time, the two end faces of the bearing and the sleeve cooperate to play the role of a friction pair, eliminating the setting of the dynamic ring and the static ring.

[0049] To sum up, the position of the impeller in the pump casing depends entirely on the installation position of the center shaft seat. At the same time, the radial clearance and axial stringing required for the rotation of the impeller have been controlled when assembling the impeller, and are no longer affected by the clearance of the impeller by other parts, reducing unstable factors; a groove is provided on the surface of the rotor body, and the rotor body is a fluoroplastic wrapped magnetic steel. A plurality of dovetail grooves are processed on the surface of the inlay of the rotor body to reduce the deformation and expansion of the plastic layer. When the fluoroplastic is heated, it is easy to expand, thereby causing the surface of the rotor body to deform and scratch the isolation sleeve. By providing the dovetail groove, lateral expansion space for the fluoroplastic is provided, while the heat dissipation effect is improved and the deformation of the rotor body surface is reduced; the super-large center shaft seat iron core is processed with multiple dovetail grooves on both the positive and negative surfaces, and process holes are processed at places where dovetail grooves are difficult to process. By processing process holes and dovetail grooves, it is ensured that the PFA plastic is not easily expanded and deformed by high temperature and separated from the iron core, and the impeller, rotor body and external magnet in the external magnetic assembly have all been tested by a dynamic balancing machine, meeting the dynamic balancing quality accuracy G2.5 level requirements, ensuring the stability and safety of the installation of each component.

[0050] The center shaft seat is assembled with the sliding shaft sleeve, the impeller and the sealing ring are assembled, the rotor body and the O-ring are assembled, the back of the impeller is assembled with the main shaft, sliding bearing, and adjusting ring, the back of the impeller is assembled with the center shaft seat, and then assembled with the rotor body, which is called the transmission assembly; the back of the isolation sleeve is assembled with the reinforcement sleeve, which is called the isolation assembly; the bracket is assembled with the motor drive end; the pressure plate and the isolation assembly are assembled with the bracket in turn, the transmission assembly is assembled with the bracket, and then the pump body and the sealing flat gasket are assembled with the center shaft seat; the transmission assembly is sent into the isolation sleeve, and the large outer diameter of the center shaft seat is matched with the large concave stop of the bracket, and then the sealing gasket and the pump body are installed on the center shaft seat of the transmission assembly, and the bolts are connected and tightened; in this way, the main components of the pump are positioned by the iron stop of the bracket, which ensures the concentricity of the pump assembly and the stability and strength requirements of the installation of the pump components.

[0051] The overall assembly of the present invention is as follows Figure 3As shown, mate the external magnetic assembly with the shaft end of the motor, tighten the set screws, install the bracket and the motor connecting plate with bolts, and then use the large concave stop of the bracket to position, and assemble the pressure plate and the spacer assembly in sequence; this assembly eliminates the problem of each component being an assembly reference for each other, which causes the accumulation of processing errors. The large concave stop of the bracket will be used as the assembly reference, and the assembly accuracy will be improved to ensure the concentricity of the components.

[0052] Through the above technical solution: when the impeller is assembled, the circumferential movement of the impeller is controlled by the assembled adjusting ring, and it is installed with the main shaft by metal threads. Compared with the existing impeller installation method, the pump body static ring, impeller dynamic ring and impeller nut are eliminated. During assembly, the impeller gap is directly controlled and is not limited by the setting of the impeller dynamic ring and the pump body static ring, which reduces the influence of other components on the impeller, ensures the stability of the impeller operation, and thus ensures the stability of the pump body operation; the rotor body of the present invention is directly assembled with the main shaft and then matched with the bearing. The rotor body does not need to be installed in conjunction with the middle shaft seat, and the two bearings are matched with the shaft sleeve, and the installation position of the shaft sleeve and the middle shaft seat is fixed, and then the isolation sleeve is installed on the middle shaft seat and pressed by the pressure plate. Compared with the existing isolation sleeve that needs to be matched with the bearing, the installation fulcrum of the bearing is reduced, and the coaxiality and the stability of the installation of each component are guaranteed.

[0053] Compared with the existing fluoroplastic magnetic pump, the present invention has the characteristics of compact structure, reasonable design, high installation precision and high operating temperature. The current design can withstand high flow and high efficiency, and can reach a flow of 400 cubic meters per hour, filling the large flow gap of domestic high-temperature resistant fluoroplastic magnetic pumps.

[0054] Example 2

[0055] like Figures 6-7 As shown, this embodiment is basically the same as embodiment 1, except that: a glue injection groove 20 is provided on the threaded head at one end of the main shaft 3 connected to the impeller 2, and a glue injection hole 19 is provided on the impeller 2; the glue injection groove 20 includes a main groove axially parallel to the main shaft 3 and a plurality of through holes evenly spaced on the main shaft 3 and connected to the main groove.

[0056] When installing the impeller and the main shaft, first apply a small amount of structural adhesive on the internal thread of the impeller and the external thread of the main shaft, then tighten the impeller and the main shaft through the metal thread, and then fully inject adhesive into the connection between the main shaft and the impeller through the adhesive injection hole on the impeller, so that the structural adhesive fills the thread gap and the adhesive injection groove, and close the adhesive injection hole after the adhesive injection is completed; fully fix the main shaft and the impeller to ensure the stability of the connection between the main shaft and the impeller, avoid accidental reverse rotation of the impeller causing the impeller to fall off or deflect, ensure the stability of the impeller operation, and thus ensure the stability of the pump body operation.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-flow fluoroplastic magnetic pump comprising a pump body, a pump chamber provided on the pump body and through which material flows, an impeller moving within the pump chamber, and a drive device for driving the impeller to rotate and having a rotating shaft connected to the impeller, characterized in that: It includes a central shaft module mounted on the pump body and matched with the rotating shaft and having at least two matching points with the rotating shaft; The central axis module includes a central axis seat, a transmission cavity provided in the central axis seat and having a transmission cavity for the rotation of the rotating shaft, and at least one bearing installed in the transmission cavity and matched with the rotating shaft; It also includes a sleeve provided on the mating surface of the bearing and the transmission cavity; The transmission cavity is provided with a limiting groove for mounting the bearing; The impeller comprises an impeller body provided with an internally threaded blind hole, and the impeller body is connected to the output end of the rotating shaft through the internally threaded blind hole; The mating surface between the internal thread blind hole and the rotating shaft is filled with glue; The water receiving surface of the impeller is set to be arc-shaped; The driving device includes a rotor body connected to the rotating shaft, an external magnetic assembly for driving the rotor body to rotate and controlled by a motor, and an isolation assembly provided between the rotor body and the external magnetic assembly, wherein the isolation assembly includes an isolation sleeve and a reinforcement sleeve; The surface of the rotor body is provided with a plastic layer, and the surface of the rotor body is provided with a groove body for heat dissipation of the rotor body and lateral expansion of the plastic layer on the surface of the rotor body. The groove body includes a dovetail groove and a through hole, the dovetail groove is located inside the rotor body, and the through hole is located outside the dovetail groove; The external magnetic assembly includes an external magnet, and the external magnetic assembly is provided with a magnetic sealing ring that can reduce magnetic leakage of the external magnet; The material of the sleeve and bearing is pressureless sintered silicon carbide (SSic), and both are sintered at a high temperature of 2100°C. The outer surface of the impeller is covered with a plastic layer, and no plastic layer is provided at the threaded connection.

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