CN117646727B

CN117646727B - Vertical multistage magnetic drive pump

Info

Publication number: CN117646727B
Application number: CN202410115052.7A
Authority: CN
Inventors: 许文达; 牟龙龙; 孙元武; 刘华中; 姜林志
Original assignee: Yantai Humon Pumps Co ltd
Current assignee: Yantai Humon Pumps Co ltd
Priority date: 2024-01-29
Filing date: 2024-01-29
Publication date: 2024-04-16
Anticipated expiration: 2044-01-29
Also published as: CN117646727A

Abstract

The invention belongs to the technical field of pump equipment, and relates to a vertical multistage magnetic pump. Including pump cylinder, motor, magnetic force driver and driven shaft, magnetic force driver includes interior magnetic rotor, outer magnetic rotor and spacer sleeve, interior magnetic rotor with the drive shaft connection of motor, outer magnetic rotor parcel is in interior magnetic rotor is outer, just outer magnetic rotor with the driven shaft is connected, the spacer sleeve sets up interior magnetic rotor with between the outer magnetic rotor, the upper end of spacer sleeve is open, its open end with the upper cover fixed connection of pump cylinder, still be equipped with the blade on the lateral wall of outer magnetic rotor, the lower extreme of driven shaft is equipped with the reflow hole. The invention adopts a forced reverse circulation structure, and the blades are added outside the outer magnetic rotor to forcibly circulate the circulating liquid, so that the vortex heat of the magnetic driver is taken away, the pressure-bearing mode of the isolation sleeve is changed, the pressure-bearing pressure of the isolation sleeve is changed into the pressure-bearing external pressure, the compression strength of the isolation sleeve is increased, and the safety performance of the pump is improved.

Description

Vertical multistage magnetic drive pump

Technical Field

The invention relates to a vertical multistage magnetic pump, and belongs to the technical field of pump equipment.

Background

The vertical multistage magnetic pump is a pump product widely used in the industries of chemical industry, pharmacy, electric power, food and the like, and is characterized by no leakage, no pollution, safety, reliability, long service life and the like. The vertical multistage magnetic pump mainly comprises a pump body, a motor, a magnetic driver, a sliding bearing and the like. The magnetic driver is a core component of the magnetic pump and consists of an inner magnetic rotor, an outer magnetic rotor, a spacer sleeve and other structures, and the rotary motion of the motor is transmitted to the pump shaft through the magnetic force action, so that the pump shaft is driven to rotate.

However, the existing vertical multistage magnetic pump still has the following problems:

(1) Poor bearing capacity: a magnetic driver of a traditional vertical multistage magnetic pump is characterized in that an outer magnetic rotor is connected with a driving shaft of a motor, an inner magnetic rotor is connected with a driven shaft and is responsible for transmitting power to impellers of all stages, and an opening end of a separation sleeve faces downwards and is connected with an upper bearing body. In the medium circulation process, the isolating sleeve mainly bears the internal pressure from the medium, and the pressure bearing capacity of the isolating sleeve is poor, so that the safety coefficient of the pump is reduced.

(2) The magnetic gap and the overcurrent area are smaller: the magnetic gap and the overflow area of the traditional magnetic pump are smaller, which means that the requirements on the dimensional accuracy are higher during the operation process. Once the situation of unsuitable size appears, extremely easily produce and scratch between inner magnetic rotor and the spacer bush, between outer magnetic rotor and the spacer bush, lead to the damage of parts such as spacer bush, this can seriously influence the safe operation of pump.

(3) And the disassembly and maintenance are difficult: the wearing parts in the vertical multistage magnetic pump, such as the parts of the sliding bearing assembly, the shaft sleeve, the thrust bearing assembly and the like, have a certain service cycle and need to be replaced periodically. However, the existing vertical multistage magnetic pump adopts a mode of connecting all parts in series and fixing all parts together by one penetrating bar. In this design, all parts need to be disassembled during maintenance to replace the vulnerable parts. Such an operation not only increases the burden of maintenance but also increases the time for maintenance. In addition, the process of disassembly and reassembly also increases the risk of leakage, making the operation inconvenient and unsafe.

(4) Axial force problem: the axial force generated when the vertical multistage magnetic pump is started or stopped can lead to the damage of the sliding bearing, the self weight of the rotor component can also generate the axial force, even under the condition that the vertical multistage magnetic pump is normally operated, the axial force can also exist, and the change of the operating condition can lead to the change of the axial force, thereby causing the damage of the balance disc and the balance sleeve.

(5) Frequent start-stop noise is large: when the motor runs, the impeller is driven to rotate through a magnetic field, the blades of the impeller suck liquid from the liquid inlet pipe, and necessary pressure is generated to output the liquid from the liquid outlet pipe. The liquid outlet pipe is connected with external equipment, and a valve is arranged at the joint. Because of the production process, the valve is frequently opened and closed sometimes, and the magnetic pump is shut down. Frequent start-up and shut-down of the magnetic pump can increase wear on the pump body. In order to solve the problem, the existing design is to add a return line on the liquid outlet pipe. When the external valve is closed, the sucked high-pressure liquid can return to the pump body from the return pipeline to form internal circulation of the liquid, so that the pump can be ensured to run for a short time within a certain time. However, in the actual production process, if the return pipeline is simply added, high pressure generated by the high-pressure liquid return in the return pipeline can impact the inside of the pump body, so that abnormal loud sound is generated, noise and vibration are out of standard, and the service performance and the service life of the magnetic pump are seriously affected. Therefore, in order to solve this problem, more effective measures are required.

Disclosure of Invention

The present invention aims to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

The technical scheme provided by the invention is as follows: the utility model provides a vertical multistage magnetic drive pump, includes pump barrel, motor, magnetic force driver and driven shaft, magnetic force driver includes interior magnetic rotor, outer magnetic rotor and spacer sleeve, interior magnetic rotor with the drive shaft of motor is connected, outer magnetic rotor parcel is in interior magnetic rotor is outer, just outer magnetic rotor with the driven shaft is connected, the spacer sleeve sets up interior magnetic rotor with between the outer magnetic rotor, the upper end of spacer sleeve is open, its open end with the upper cover fixed connection of pump barrel, still be equipped with the blade on the lateral wall of outer magnetic rotor, the lower extreme of driven shaft is equipped with the reflow hole.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

The invention improves the traditional vertical multistage magnetic pump and changes the medium circulation mode and the pressure-bearing mode of the isolation sleeve. Most of the medium is pressurized by impellers of all stages and finally pumped out through a liquid outlet pipe. At the same time, a small part of the medium upwards passes through the balance device, the upper bearing body and other parts, and under the rotation and pressurization effects of the blades outside the outer magnetic rotor, the medium enters the gap between the isolation sleeve and the outer magnetic rotor along the outer side of the outer magnetic rotor. The medium cools the magnetic driver, and finally the medium enters the inner cavity of the driven shaft from the gap between the isolating sleeve and the outer magnetic rotor and flows back into the pump cylinder from the backflow hole at the bottom of the driven shaft. The invention adopts a forced reverse circulation structure, and the blades are added outside the outer magnetic rotor to carry out pressurization, so that circulating liquid is forced to circulate, vortex heat of the magnetic driver is taken away, the pressure-bearing mode of the isolation sleeve is changed, the pressure of the isolation sleeve is changed into the pressure of the isolation sleeve, the compression strength of the isolation sleeve is increased, and the safety performance of the pump is improved.

Further, the width of the magnetic gap between the inner magnetic rotor and the outer magnetic rotor is in the range of 6mm to 7.5mm

The adoption of the further scheme has the beneficial effects that the small magnetic gap is changed into the large magnetic gap, so that the overcurrent area can be effectively increased. The design can reduce the flowing resistance of the medium in the magnetic gap, and reduce the scratch probability among the inner magnetic rotor, the isolation sleeve and the outer magnetic rotor, thereby improving the safety and stability of the pump. In addition, the design of big magnetic gap can also reduce the calorific capacity of magnetic actuator, improves its cooling efficiency, further strengthens the performance and the reliability of pump. Therefore, the design is very effective for improving the traditional vertical multistage magnetic pump, the service life and the efficiency of the pump can be improved, and the maintenance cost and the maintenance time are reduced.

Further, an upper bearing body, a balancing device, a multi-stage impeller and a lower bearing body which are sequentially arranged on the driven shaft from top to bottom are further arranged in the pump cylinder, the multi-stage impeller comprises a secondary impeller and a final-stage impeller, a liquid inlet pipe and a liquid outlet pipe are arranged on the pump cylinder, the liquid outlet pipe is connected with an outlet of the final-stage impeller, and the backflow hole is close to the secondary impeller.

Further, the balancing device comprises a balancing disc, a first permanent magnet, a balancing sleeve and a second permanent magnet, wherein the balancing disc is arranged on the driven shaft, the first permanent magnet is embedded in the balancing disc, the balancing sleeve is fixedly connected with the upper bearing body, the second permanent magnet is embedded in the balancing sleeve, and homopolar of the first permanent magnet and homopolar of the second permanent magnet are oppositely arranged.

The balancing device has the beneficial effects that the balancing device not only can play a role in balancing the axial force of the pump, but also is embedded with a group of first permanent magnets at the balancing disc, proper magnetic induction intensity is selected according to the shape of the pump, a group of second permanent magnets are embedded at the balancing sleeve, the balancing disc and the magnetic driver are lifted by adopting the principle of homopolar repulsion, a gap is formed between the balancing disc and the balancing sleeve, the balancing disc and the balancing sleeve can have certain opening and closing degree before the pump is started, and adhesive wear between the balancing disc and the balancing sleeve is prevented.

Further, the balancing device further comprises a disc cover and a sleeve cover, the first permanent magnet is mounted on the lower end face of the balancing disc in a limiting mode through the disc cover, and the second permanent magnet is mounted on the upper end face of the balancing sleeve in a limiting mode through the sleeve cover.

The adoption of the further scheme has the beneficial effects that the first permanent magnet is wrapped by the disc cover, so that the first permanent magnet is prevented from reacting with the medium, the permanent magnet is prevented from being damaged due to failure, the second permanent magnet is wrapped by the sleeve cover, and the second permanent magnet is prevented from reacting with the medium, so that the permanent magnet is prevented from being damaged due to failure.

Further, the balance disc comprises an upper disc body and an inner sleeve, the first permanent magnet is arranged on the lower end face of the upper disc body, and the inner sleeve is sleeved on the driven shaft; the balance sleeve comprises a lower disc body and an outer sleeve, the second permanent magnet is installed on the upper end face of the lower disc body, the outer sleeve is sleeved on the outer side of the inner sleeve, and a throttling groove is further arranged between the inner sleeve and the outer sleeve.

Further, the device further comprises a penetrating bar, a thrust bearing, a first-stage guide vane, a first-stage impeller, a locking bolt and a water absorbing cover, wherein two ends of the penetrating bar are respectively connected with the upper bearing body and the lower bearing body, parts between the upper bearing body and the lower bearing body are fixed on the driven shaft in an axial overlapping mode, the water absorbing cover is detachably fixed on the lower bearing body, the locking bolt is in threaded connection with the end portion of the driven shaft to fix the thrust bearing, the first-stage guide vane and the first-stage impeller on the bottom end of the driven shaft in the axial mode, an upper sliding bearing assembly is arranged between the upper bearing body and the driven shaft, and a lower sliding bearing assembly is arranged between the lower bearing body and the driven shaft.

The beneficial effect of adopting the further scheme is that the parts which are easy to wear, such as the parts of the upper sliding bearing assembly, the lower sliding bearing assembly, the thrust bearing, the first-stage guide vane and the like, are fixed separately from the parts which are fixed by the penetrating bar in the middle. When the wearing parts are required to be replaced, the parts of the middle section do not need to be disassembled, so that the wearing parts can be replaced easily under the condition that the penetrating bar is not disassembled. The design makes maintenance and replacement of the vulnerable part very convenient and quick, remarkably improves maintenance efficiency, reduces maintenance cost and can prolong the service life of equipment.

Further, the upper sliding bearing assembly comprises an upper sliding bearing and an upper bearing seat, the upper sliding bearing is sleeved on the driven shaft, the upper bearing seat is sleeved outside the upper sliding bearing, and a flange at the upper end of the upper bearing seat is connected with the upper bearing body through a plurality of first bolts; the lower sliding bearing assembly comprises a lower sliding bearing and a lower bearing seat, the lower sliding bearing is sleeved on the driven shaft, the lower bearing seat is sleeved outside the lower sliding bearing, and a flange at the lower end of the lower bearing seat is connected with the lower bearing body through a plurality of second bolts.

The further scheme has the beneficial effects that the first bolt can be detached from the upper bearing body from the upper side, so that the upper bearing assembly can be detached for replacement; the second bolt can be detached from the lower bearing body from below, so that the lower bearing assembly can be detached for replacement.

Further, still include the amortization backward flow ware, set up the backward flow mouth on the drain pipe, the amortization backward flow ware includes the barrel, the barrel has the inner chamber, the upper end of barrel is open opening, set up a plurality of holes that permeate water on the circumference lateral wall of barrel, the opening of barrel upper end with the backward flow mouth on the drain pipe is connected.

The vertical multistage magnetic pump has the beneficial effects that the silencing reflux device is arranged on the vertical multistage magnetic pump, holes are drilled on the periphery of the cylinder body of the silencing reflux device, and the sound and pressure originally concentrated in the cylinder body can be dispersed, so that noise and pressure vibration generated during high-pressure liquid reflux are reduced, the silencing vibration reduction effect is achieved, and the service life of the vertical multistage magnetic pump is remarkably prolonged.

Furthermore, the cylinder body is in a shape of thin upper part and thick lower part, and the middle is connected through a transition section.

The beneficial effect of adopting above-mentioned further scheme is, the barrel is by thin grow and drilling to reduce the velocity of flow and slowly flow, simultaneously with the medium diffusion of backward flow to different directions, thereby play fine amortization damping effect. The design can adjust the flow of the reflux according to the flow velocity of the liquid and the diameter of the cylinder, effectively reduce noise and vibration, ensure that the liquid flows more stably, and improve the reflux efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a vertical multistage magnetic pump of the present invention;

FIG. 2 is a schematic view of a partially enlarged structure of an upper portion of the vertical multistage magnetic pump of the present invention;

FIG. 3 is a schematic exploded view of the balance disc assembly of the present invention;

FIG. 4 is a schematic exploded view of the balance sleeve assembly of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;

FIG. 6 is a schematic view of the muffler reflux unit of the present invention;

FIG. 7 is a schematic illustration of a media circulation flow path of the present invention;

FIG. 8 is a schematic diagram of a medium circulation flow path within a conventional vertical multistage magnetic pump;

In the figure, 1, a pump barrel; 2. a water absorbing cover; 3. a first stage impeller; 4. a lower bearing body; 5. a secondary impeller; 6. a liquid inlet pipe; 7. a last stage impeller; 8. a balancing device; 81. a balancing disk; 811. an upper tray body; 812. an inner sleeve; 813. a tray cover; 814. a first permanent magnet; 82. a balance sleeve; 821. a lower tray body; 822. an outer sleeve; 823. a cover; 824. a second permanent magnet; 83. a throttling groove; 9. an upper bearing body; 10. a bracket; 11. an outer magnetic rotor; 12. a liquid outlet pipe; 13. a cylinder cover; 15. a motor; 16. an inner magnetic rotor; 17. a spacer sleeve; 18. an upper sliding bearing assembly; 181. an upper sliding bearing; 182. an upper bearing seat; 183. a first bolt; 19. an upper shaft sleeve; 20. a silencing reflux device; 21. a water permeable hole; 22. a driven shaft; 221. a limit step; 23. penetrating a bar; 24. a lower sliding bearing assembly; 241. a lower sliding bearing; 242. a lower bearing seat; 243. a second bolt; 25. a lower shaft sleeve; 26. a first stage guide vane; 27. a locking bolt; 28. a thrust bearing; 29. adjusting the sleeve; 30. a backstop pad; 31. a nut; 32. and (3) a blade.

Detailed Description

The principles and features of the present invention are described below in connection with examples, which are set forth only to illustrate the present invention and not to limit the scope of the invention.

As shown in fig. 8, the circulation path of the medium in the conventional vertical multistage magnetic pump is: most of the medium passes through each stage impeller, the pressure and the speed of the medium are gradually increased under the rotation action of each stage impeller, and when the medium passes through the final stage impeller 7, the medium is pumped out of the pump through the liquid outlet pipe 12. At the same time, a small part of medium enters the inner cavity of the driven shaft 22 through the liquid inlet at the lower end of the driven shaft 22 and upwards enters the inside of the isolation sleeve 17 along the inner cavity of the driven shaft 22. This part of the medium cools the magnetic drive, then passes through the spacer 17 and the balancing device 8 in sequence, and finally returns to the pump cylinder 1 through the balancing pipe. During this medium circulation, the spacer 17 is mainly subjected to the internal pressure from the medium, and the pressure-bearing capacity of the spacer 17 is poor, thereby reducing the safety factor of the pump.

Compared with the structural design of the traditional vertical multistage magnetic pump, the invention has the advantages that the inner magnetic rotor 16 is contacted with air, the outer magnetic rotor 11 is contacted with a medium, and the isolation sleeve 17 is changed into external pressure from internal pressure in a reverse assembly mode that the opening of the isolation sleeve 17 is upward; the blades 32 are additionally arranged outside the outer magnetic rotor 11, so that the forced reverse circulation of the medium is realized, and the effect of taking away the vortex heat is achieved; the inertia force of the rotor is increased by properly increasing the weight of the inner magnetic rotor 16, so that the motor 15 is ensured to start smoothly; the invention changes the small magnetic gap into the large magnetic gap, and can effectively increase the overcurrent area; the invention also changes the connecting structure of the outer magnetic rotor 11 of the traditional vertical multistage magnetic pump and the driving shaft of the motor 15 into a direct-connection structure, has simple structure, easy operation, small mechanical loss, small output power and high efficiency compared with the prior art.

As shown in fig. 1 to 7, the vertical multistage magnetic pump of the invention comprises a pump cylinder 1, a motor 15, a magnetic driver and a driven shaft 22, wherein the magnetic driver comprises an inner magnetic rotor 16, an outer magnetic rotor 11 and a separation sleeve 17, the inner magnetic rotor 16 is connected with a driving shaft of the motor 15, the outer magnetic rotor 11 is wrapped outside the inner magnetic rotor 16, the outer magnetic rotor 11 is connected with the driven shaft 22, the separation sleeve 17 is arranged between the inner magnetic rotor 16 and the outer magnetic rotor 11, the upper end of the separation sleeve 17 is opened, the opening end of the separation sleeve is fixedly connected with an upper cover of the pump cylinder 1, a blade 32 is further arranged on the outer side wall of the outer magnetic rotor 11, and a reflow hole is arranged at the lower end of the driven shaft 22.

More specifically, the width of the magnetic gap between the inner magnetic rotor 16 and the outer magnetic rotor 11 is in the range of 6mm to 7.5mm. The upper end of the pump cylinder 1 is provided with a cylinder cover 13, and the motor 15 is fixed outside the cylinder cover 13. The outer side of the outer magnetic rotor 11 is provided with a bracket 10, the lower end of the bracket 10 is fixed on the upper bearing body 9, and the upper end of the bracket 10 is fixedly connected with a cylinder cover 13. The pump cylinder 1 is internally provided with an upper bearing body 9, a balancing device 8, a multi-stage impeller and a lower bearing body 4 which are sequentially arranged on the driven shaft 22 from top to bottom, the multi-stage impeller comprises a secondary impeller 5 and a final-stage impeller 7, the secondary impeller 5 is positioned at the lower end of the pump shaft and above the lower bearing body 4, the final-stage impeller 7 is positioned at the upper end of the driven shaft 22 and below the balancing device 8, the pump cylinder 1 is provided with a liquid inlet pipe 6 and a liquid outlet pipe 12, the liquid outlet pipe 12 is connected with an outlet of the final-stage impeller 7, and a backflow hole is close to the secondary impeller 5.

As shown in fig. 2 to 4, the balancing device 8 includes a balancing disc 81, a first permanent magnet 814, a balancing sleeve 82 and a second permanent magnet 824, the balancing disc 81 is mounted on the driven shaft 22, the first permanent magnet 814 is embedded in the balancing disc 81, the balancing sleeve 82 is fixedly connected with the upper bearing body 9, the second permanent magnet 824 is embedded in the balancing sleeve 82, and the first permanent magnet 814 and the second permanent magnet 824 are disposed with the same poles opposite to each other.

The balancing device 8 further comprises a tray cover 813 and a sleeve cover 823, the first permanent magnet 814 is mounted on the lower end face of the balancing tray 81 in a limiting mode through the tray cover 813, and the second permanent magnet 824 is mounted on the upper end face of the balancing sleeve 82 in a limiting mode through the sleeve cover 823. The first permanent magnet 814 is wrapped by the disc cover 813, so that the first permanent magnet 814 is prevented from reacting with the medium, and the permanent magnet is prevented from being invalid and damaged, and the second permanent magnet 824 is wrapped by the sleeve cover 823, so that the second permanent magnet 824 is prevented from reacting with the medium, and the permanent magnet is prevented from being invalid and damaged.

The surfaces of the tray cover 813 and the cover 823 are provided with wear-resistant material layers. The manufacturing method of the wear-resistant material layer is not limited in the embodiment of the present invention, and the wear-resistant material layer may be manufactured by laser cladding, laser coating or electroplating, so long as the effect of preventing the wear or corrosion of the disc cover 813 and the cover 823 can be achieved, and the wear-resistant material layer is within the protection scope of the present invention. The wear-resistant material layer is made of high wear-resistant materials such as nickel-based tungsten carbide alloy or stellite alloy.

The balance disc 81 comprises an upper disc body 811 and an inner sleeve 812, the first permanent magnet 814 is mounted on the lower end face of the upper disc body 811, and the inner sleeve 812 is used for sleeving the driven shaft 22; the balancing sleeve 82 comprises a lower disc 821 and an outer sleeve 822, the second permanent magnet 824 is mounted on the upper end face of the lower disc 821, the outer sleeve 822 is sleeved on the outer side of the inner sleeve 812, and a throttling groove 83 is further arranged between the inner sleeve 812 and the outer sleeve 822. In this embodiment, the upper disc 811 and the lower disc 821 are disc-shaped, and of course, the upper disc 811 and the lower disc 821 may also be elliptical, square or polygonal, so long as the axial force of the pump can be balanced within the protection scope of the present invention. The shapes of the first permanent magnet 814 and the second permanent magnet 824 are respectively matched with the shapes of the upper disc 811 and the lower disc 821, and in this embodiment, the first permanent magnet 814 and the second permanent magnet 824 are both in a circular ring shape.

The driven shaft 22 is further provided with a limiting step 221, the limiting step 221 is located above the balance disc 81, the upper end surface of the balance disc 81 is in limiting contact with the limiting step 221, and the limiting step 221 is used for limiting axial displacement of the balance disc 81.

The balance disc 81, the first permanent magnet 814 and the disc cover 813 constitute a balance disc assembly; the balance sleeve 82, the second permanent magnet 824 and the sleeve cover 823 form a balance sleeve assembly, and the balance disc assembly is fixed on the driven shaft 22 and is connected with the multistage impellers in series to form a rotating assembly; the balance sleeve assembly is fixed on the upper bearing body 9 and fastened by bolts to form a static assembly. The balance disc assembly and the balance sleeve 82 assembly are designed into disc-type homopolar balance assemblies according to the principle of the magnetic coupling driver, the homopolar repulsion principle is adopted to enable the balance disc 81 and the balance sleeve 82 to generate a required gap value, and the disc cover 813 and the sleeve cover 823 are covered with a high wear-resistant material to perform double assurance, so that the balance disc assembly and the balance sleeve assembly are prevented from being worn when the pump is started, used and stopped.

The embodiment of the invention does not limit the size of the gap between the balance disc 81 and the balance sleeve 82, and the size of the gap value is determined through calculation and test, so long as a certain opening and closing degree of the balance disc 81 and the balance sleeve 82 before the pump is started is ensured, and the adhesion is prevented, and the invention is within the protection scope of the invention.

As shown in fig. 1 and 5, the vertical multistage magnetic pump further comprises a penetrating bar 23, a thrust bearing 28, a first-stage guide vane 26, a first-stage impeller 3, a locking bolt 27 and a water absorbing cover 2, wherein two ends of the penetrating bar 23 are respectively connected with the upper bearing body 9 and the lower bearing body 4, parts between the upper bearing body 9 and the lower bearing body 4 are axially overlapped and fixed on the driven shaft 22, the water absorbing cover 2 is detachably fixed on the lower bearing body 4, the locking bolt 27 is in threaded connection with the end part of the driven shaft 22 to axially fix the thrust bearing 28, the first-stage guide vane 26 and the first-stage impeller 3 at the bottom end of the driven shaft 22, an upper sliding bearing assembly 18 is arranged between the upper bearing body 9 and the driven shaft 22, and a lower sliding bearing assembly 24 is arranged between the lower bearing body 4 and the driven shaft 22. An upper sleeve 19 is further disposed between the upper sliding bearing 181 and the driven shaft 22, and the upper sleeve 19 is used for protecting the driven shaft 22 from abrasion and corrosion. A lower sleeve 25 is further disposed between the lower sliding bearing 241 and the driven shaft 22, and the lower sleeve 25 is used for protecting the driven shaft 22 from abrasion and corrosion.

The upper sliding bearing assembly 18 comprises an upper sliding bearing 181 and an upper bearing seat 182, the upper sliding bearing 181 is sleeved on the driven shaft 22, the upper bearing seat 182 is sleeved outside the upper sliding bearing 181, and a flange at the upper end of the upper bearing seat 182 is connected with the upper bearing body 9 through a plurality of first bolts 183; the lower sliding bearing assembly 24 comprises a lower sliding bearing 241 and a lower bearing seat 242, the lower sliding bearing 241 is sleeved on the driven shaft 22, the lower bearing seat 242 is sleeved outside the lower sliding bearing 241, and a flange at the lower end of the lower bearing seat 242 is connected with the lower bearing body 4 through a plurality of second bolts 243.

The vertical multistage magnetic pump further comprises a retaining gasket 30 and a nut 31, and the retaining gasket 30, the nut 31 and the locking bolt 27 are matched to fasten the thrust bearing 28, the first-stage guide vane 26 and the first-stage impeller 3 on the driven shaft 22. The thrust bearing 28 is mounted at the lower end of the lower sliding bearing assembly 24 for limiting the downward axial movement of the lower sliding bearing 241, and the upper end of the lower sliding bearing assembly 24 is provided with an adjusting sleeve 29 for limiting the upward axial movement of the lower sliding bearing 241.

When the upper part of the upper sliding bearing assembly 18, the upper shaft sleeve 19 and other wearing parts need to be replaced, firstly, the motor 15 is detached from the cylinder cover 13, after the cylinder cover 13 is opened, the outer magnetic rotor 11, the isolation sleeve 17 and the inner magnetic rotor 16 are detached and removed, and then the first bolts 183 for fixing the upper bearing seat 182 are detached, so that the upper sliding bearing 181, the upper bearing seat 182 and the upper shaft sleeve 19 can be detached from the driven shaft 22 for replacement; when the wearing parts such as the lower sliding bearing 241, the lower shaft sleeve 25 and the thrust bearing 28 are needed to slide down, the pump cylinder 1 is removed, the water absorbing cover 2 is detached from the lower bearing body 4, then the locking nut 31 is loosened, the thrust bearing 28, the first-stage guide vane 26 and the first-stage impeller 3 can be detached from the driven shaft 22, then the second bolt 243 for fixing the lower bearing seat 242 is detached, and the lower sliding bearing 241, the lower bearing seat 242 and the lower shaft sleeve 25 can be detached for replacement.

As shown in fig. 1 and 6, the vertical multistage magnetic pump further includes a silencing backflow device 20, a backflow port is formed in the liquid outlet pipe 12, the silencing backflow device 20 includes a cylinder body, the cylinder body has an inner cavity, the upper end of the cylinder body is an open opening, a plurality of water permeable holes 21 are formed in the circumferential side wall of the cylinder body, and the opening at the upper end of the cylinder body is connected with the backflow port in the liquid outlet pipe 12. The cylinder body is in a shape of thin upper part and thick lower part, and the middle is connected through a transition section.

The silencing and vibration damping principle of the vertical multistage magnetic pump is as follows: after the liquid is pressurized by the multistage impeller and then pumped out from the liquid outlet pipe 12, when the liquid outlet pipe 12 is additionally provided with the silencing reflux device 20, if a valve connected with the outside through the liquid outlet pipe 12 of the magnetic pump is closed, high-pressure liquid in the liquid outlet pipe 12 can flow into the silencing reflux device 20 through a reflux port, a plurality of water permeable holes 21 are formed in the side wall of the barrel body of the silencing reflux device 20, the high-pressure liquid returns into the pump barrel 1 through the water permeable holes 21, and the water permeable holes 21 can disperse sound and pressure originally concentrated in the pump barrel 1, so that noise and pressure vibration generated during high-pressure liquid reflux are reduced, and the noise reduction effect is achieved.

As shown in fig. 7, a medium circulation flow chart of the vertical multistage magnetic pump of the present invention is shown: most of the medium is pressurized by the impellers of each stage, the pressure and the speed of the medium are gradually increased under the rotation action of the impellers of each stage, and when the medium passes through the final stage impeller 7, the medium is pumped out through the liquid outlet pipe 12. At the same time, a small part of the medium continuously passes through the balance device 8, the upper bearing body 9 and other parts, and the medium enters the gap between the isolation sleeve 17 and the outer magnetic rotor 11 along the outer side of the outer magnetic rotor 11 under the rotary pressurizing action of the blades 32 outside the outer magnetic rotor 11. The medium cools the magnetic driver, and finally the medium enters the inner cavity of the driven shaft 22 from the gap between the isolating sleeve 17 and the outer magnetic rotor 11 and flows back into the pump cylinder 1 from the backflow hole at the bottom of the driven shaft 22.

The invention adopts a forced reverse circulation structure, and the blades 32 are added outside the outer magnetic rotor 11 to carry out pressurization, so that circulating liquid is forced to circulate, vortex heat of the magnetic driver is taken away, meanwhile, the pressure-bearing mode of the isolation sleeve 17 is changed, the internal pressure of the isolation sleeve 17 is changed into external pressure, the compression strength of the isolation sleeve 17 is increased, and the safety performance of the pump is improved.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides a vertical multistage magnetic drive pump, includes pump cylinder (1), motor (15), magnetic force driver and driven shaft (22), its characterized in that, magnetic force driver includes interior magnetic rotor (16), outer magnetic rotor (11) and spacer sleeve (17), interior magnetic rotor (16) with the drive shaft of motor (15) is connected, outer magnetic rotor (11) parcel is in outside interior magnetic rotor (16), just outer magnetic rotor (11) with driven shaft (22) are connected, spacer sleeve (17) set up interior magnetic rotor (16) with between outer magnetic rotor (11), the upper end of spacer sleeve (17) is opened, its open end with the upper cover fixed connection of pump cylinder (1), still be equipped with blade (32) on the lateral wall of outer magnetic rotor (11), the lower extreme of driven shaft (22) is equipped with the reflow hole.

A liquid inlet pipe (6) and a liquid outlet pipe (12) are arranged on the pump cylinder (1);

Still include amortization backward flow ware (20), offer the return port on drain pipe (12), amortization backward flow ware (20) are including the barrel, the barrel has the inner chamber, the upper end of barrel is open opening, offer a plurality of holes (21) that permeate water on the circumference lateral wall of barrel, the opening of barrel upper end with the return port on drain pipe (12) is connected.

2. The vertical multistage magnetic pump according to claim 1, characterized in that the width of the magnetic gap between the inner magnetic rotor (16) and the outer magnetic rotor (11) ranges from 6mm to 7.5mm.

3. The vertical multistage magnetic pump according to claim 1, wherein an upper bearing body (9), a balancing device (8), a multistage impeller and a lower bearing body (4) which are sequentially installed on the driven shaft (22) from top to bottom are further arranged in the pump cylinder (1), the multistage impeller comprises a secondary impeller (5) and a final impeller (7), the liquid outlet pipe (12) is connected with an outlet of the final impeller (7), and the backflow hole is close to the secondary impeller (5).

4. A vertical multistage magnetic pump according to claim 3, characterized in that the balancing device (8) comprises a balancing disc (81), a first permanent magnet (814), a balancing sleeve (82) and a second permanent magnet (824), the balancing disc (81) is mounted on the driven shaft (22), the first permanent magnet (814) is embedded in the balancing disc (81), the balancing sleeve (82) is fixedly connected with the upper bearing body (9), the second permanent magnet (824) is embedded in the balancing sleeve (82), and the first permanent magnet (814) and the second permanent magnet (824) are arranged homopolar opposite to each other.

5. The vertical multistage magnetic pump according to claim 4, wherein the balancing device (8) further comprises a disc cover (813) and a sleeve cover (823), the first permanent magnet (814) is mounted on the lower end face of the balancing disc (81) in a limiting mode through the disc cover (813), and the second permanent magnet (824) is mounted on the upper end face of the balancing sleeve (82) in a limiting mode through the sleeve cover (823).

6. The vertical multistage magnetic pump according to claim 5, characterized in that the balancing disk (81) comprises an upper disk body (811) and an inner sleeve (812), the first permanent magnet (814) is mounted on the lower end face of the upper disk body (811), and the inner sleeve (812) is used for sleeving on the driven shaft (22); the balance sleeve (82) comprises a lower disc body (821) and an outer sleeve (822), the second permanent magnet (824) is installed on the upper end face of the lower disc body (821), the outer sleeve (822) is sleeved on the outer side of the inner sleeve (812), and a throttling groove (83) is further formed between the inner sleeve (812) and the outer sleeve (822).

7. The vertical multistage magnetic pump according to any one of claims 4 to 6, wherein a limiting step (221) is further arranged on the driven shaft (22), the limiting step (221) is located above the balance disc (81), the upper end face of the balance disc (81) is in limiting contact with the limiting step (221), and the limiting step (221) is used for limiting axial displacement of the balance disc (81).

8. The vertical multistage magnetic pump according to claim 7, further comprising a penetrating bar (23), a thrust bearing (28), a first-stage guide vane (26), a first-stage impeller (3), a locking bolt (27) and a water absorbing cover (2), wherein two ends of the penetrating bar (23) are respectively connected with the upper bearing body (9) and the lower bearing body (4), parts between the upper bearing body (9) and the lower bearing body (4) are axially overlapped and fixed on the driven shaft (22), the water absorbing cover (2) is detachably fixed on the lower bearing body (4), the locking bolt (27) is in threaded connection with the end portion of the driven shaft (22) to fix the thrust bearing (28), the first-stage guide vane (26) and the first-stage impeller (3) at the bottom end of the driven shaft (22) along the axial direction, an upper sliding bearing assembly (18) is arranged between the upper bearing body (9) and the driven shaft (22), and a lower sliding bearing assembly (24) is arranged between the lower bearing body (4) and the driven shaft (22).

9. The vertical multistage magnetic pump according to claim 8, wherein the upper sliding bearing assembly (18) comprises an upper sliding bearing (181) and an upper bearing seat (182), the upper sliding bearing (181) is sleeved on the driven shaft (22), the upper bearing seat (182) is sleeved outside the upper sliding bearing (181), and a flange at the upper end of the upper bearing seat (182) is connected with the upper bearing body (9) through a plurality of first bolts (183); the lower sliding bearing assembly (24) comprises a lower sliding bearing (241) and a lower bearing seat (242), the lower sliding bearing (241) is sleeved on the driven shaft (22), the lower bearing seat (242) is sleeved outside the lower sliding bearing (241), and a flange at the lower end of the lower bearing seat (242) is connected with the lower bearing body (4) through a plurality of second bolts (243).

10. The vertical multistage magnetic pump according to claim 1, wherein the cylinder is thin at the top and thick at the bottom.