A magnetically driven self-priming vortex pump

Abstract

The present invention relates to a self-priming vortex pump, and specifically to a magnetically driven self-priming vortex pump, wherein a pump cover is fixedly connected to the front end of a housing to form an annular flow channel, and a motor is fixedly connected to the rear end of the housing; the interior of the housing includes a pump shaft fixed in the housing by a chuck, an impeller keyed to the front end of the pump shaft and located in the annular flow channel, an inner rotor fixed to the rear end of the pump shaft, an outer rotor keyed to the motor, and an isolation sleeve arranged between the inner rotor and the outer rotor and fixed to the housing; the housing is provided with a liquid inlet and a liquid outlet section communicating with the annular flow channel, and the liquid outlet section includes a gas-liquid separation chamber communicating with the annular flow channel, a reflux port connecting the gas-liquid separation chamber and the annular flow channel, and a liquid outlet arranged on the gas-liquid separation chamber; the lower end of the impeller is provided with a liquid storage area formed by the housing and the pump cover. Compared with the prior art, the present invention adopts magnetic drive to realize the conversion of the shaft seal of the self-priming vortex pump from a dynamic seal to a static seal, effectively solving the phenomena of running, bubbling, dripping, and leakage.

Description

Technical Field

[0001] The invention relates to a self-priming vortex pump, in particular to a magnetically driven self-priming vortex pump. Background Art

[0002] The vortex pump is mainly composed of an impeller, a pump body, a pump cover and the annular flow channel formed by them. The vortex pump impeller is different from the centrifugal pump impeller. It is a disc with radial blades on the outer wheel. The liquid enters the flow channel from the suction pipe, repeatedly makes vortex motion in the blades and the pump body flow channel, obtains energy through the rotating impeller, and is transported to the discharge pipe to complete the working process of the pump. The specific speed of the vortex pump is usually between 6-50. It is a small flow, high head pump, suitable for conveying liquids or gas-liquid mixtures with a viscosity not greater than 5°E, no solid particles, and no impurities. Its flow range is 0.18-45m 3 / h, and the single-stage head can reach about 250m. Vortex pumps are usually used in the petroleum and chemical sectors, especially in chemical fibers, medicines, fertilizers and small boiler water supply.

[0003] The shaft seals of existing self-priming vortex pumps all adopt dynamic seal mechanical seals or packing seals, which will cause running, bubbling, dripping, leakage and other phenomena. Therefore, the existing self-priming vortex pumps cannot or are difficult to be used for the transportation of flammable, explosive, harmful, toxic and rare and precious liquids, and need to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetically driven self-priming vortex pump in order to solve at least one of the above problems. By adopting magnetic drive, the shaft seal of the self-priming vortex pump is converted from a dynamic seal to a static seal, effectively solving the problems of running, bubbling, dripping, and leakage, so that the magnetically driven self-priming vortex pump can be used for the transportation of flammable and explosive, harmful and toxic, and rare and precious liquids, thereby broadening the scope of application.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A magnetically driven self-priming vortex pump comprises a housing, a pump cover is fixedly connected to the front end of the housing to form an annular flow channel, and a motor is fixedly connected to the rear end of the housing;

[0007] The interior of the housing includes a pump shaft fixed in the housing by a chuck, an impeller keyed to the front end of the pump shaft and located in the annular flow channel, an inner rotor fixed to the rear end of the pump shaft, an outer rotor keyed to the motor, and an isolation sleeve disposed between the inner rotor and the outer rotor and fixed to the housing;

[0008] The shell is provided with a liquid inlet and a liquid outlet section communicating with the annular flow channel, the liquid outlet section includes a gas-liquid separation chamber communicating with the annular flow channel, a reflux port connecting the gas-liquid separation chamber and the annular flow channel, and a liquid outlet provided on the gas-liquid separation chamber; the lower end of the impeller is provided with a liquid storage area formed by the shell and the pump cover;

[0009] The motor drives the outer rotor to rotate, and the magnetic field force generated by the outer rotor pushes and pulls the inner rotor to rotate, thereby driving the pump shaft and the impeller to rotate synchronously (magnetic drive); the air sucked in from the liquid inlet is mixed with the liquid stored in the liquid storage area, and the gas-liquid mixture is transported to the gas-liquid separation chamber under the rotation of the impeller, and the air leaves from the liquid outlet, and the liquid returns to the annular flow channel through the reflux port until the air is completely exhausted (self-priming), and the magnetically driven self-priming vortex pump starts to work normally.

[0010] The outer rotor and the inner rotor are made of magnetic materials, so that the outer rotor can generate a magnetic field after being driven by the motor to rotate, thereby driving the inner rotor to rotate, thereby achieving static sealing; at the same time, the isolation sleeve is made of non-magnetic material to prevent it from changing or moving under the action of the magnetic field.

[0011] Preferably, 40-56 blades are evenly arranged along the circumferential direction on both sides of the impeller.

[0012] Further preferably, 48 blades are evenly arranged along the circumferential direction on both sides of the impeller.

[0013] When the impeller rotates and does work (when the magnetically driven self-priming vortex pump is working), the blades symmetrically distributed along the circumferential direction on both sides of the impeller will transfer energy to the liquid entering the flow channel. The energy transfer process is carried out through the momentum exchange of three-dimensional flow. The energy transfer is repeated several to dozens of times in the flow channel of the entire pump. The longitudinal vortex gains energy every time it passes through the impeller in the flow channel. After multiple superpositions, the longitudinal vortex will convert the stored energy into pressure energy and kinetic energy at the pump outlet and pump the liquid to the next position.

[0014] Preferably, the shell includes a pump body and a bracket that are fixedly connected; the pump cover is fixedly connected to the front end of the pump body, together forming an annular flow channel (for liquid to pass through and accumulate energy therein) and a liquid storage area (retaining part of the liquid in the liquid storage area to achieve self-priming); the rear end of the bracket is fixedly connected to the motor; the liquid inlet and liquid outlet section are both arranged on the pump body; the bracket presses the isolation sleeve against the rear end of the pump body to achieve fixation of the isolation sleeve.

[0015] Preferably, a sealing gasket is provided between the pump cover and the pump body and between the pump body and the isolation sleeve. The provision of the sealing gasket further improves the sealing performance and prevents leakage of the internal liquid or medium.

[0016] Preferably, a pair of bearings are sleeved on the outer side of the pump shaft, and the bearings are fixed on the chuck by positioning pins. The bearings can support the pump shaft and reduce the friction coefficient during the rotation of the pump shaft, while also ensuring the rotation accuracy of the pump shaft.

[0017] Preferably, the bearing comprises a bearing inner ring sleeved on the outside of the pump shaft and a bearing outer ring sleeved on the outside of the bearing inner ring, and the bearing outer ring is fixed on the chuck by a locating pin. The bearing outer ring and the bearing inner ring are both made of SiC, which has good wear resistance and corrosion resistance, so that it can be used in bearing and rotary seal applications. In addition, the additional hardness and conductivity can further improve the sealing effect and bearing performance.

[0018] Preferably, the outer side of the pump shaft is also sleeved with a front seat plate, a bearing thrust ring, a shaft sleeve and a rear seat plate, the shaft sleeve is set between the bearings; a pair of bearing thrust rings are provided, which are respectively set against the outer sides of the bearings; the front seat plate and the rear seat plate are respectively set against the outer sides of the bearing thrust rings.

[0019] Preferably, a plurality of O-rings are sleeved on the inner side of the bearing inner ring on the pump shaft. The O-rings can further improve the sealing ability and elastically tighten the bearing inner ring to avoid gaps between the SIC bearing inner ring and the shaft, which may damage the bearing.

[0020] Preferably, a liquid flow channel is also provided in the shell, and the liquid flow channel includes a guide pin that fixes the chuck on the shell, a flow channel in the chuck, a flow channel in the pump shaft, and a flow channel in the isolation sleeve. The liquid flows into the shell from the guide pin arranged in the high-pressure area (the outlet of the magnetically driven self-priming vortex pump), and then passes through the flow channel in the chuck to reach the flow channel in the pump shaft (during the flow through the intersection of the chuck and the bearing to lubricate the bearing), cooling the inside of the pump shaft, and then flows from the flow channel in the pump shaft into the flow channel in the isolation sleeve, cooling the isolation sleeve and the outside of the pump shaft, and finally flows out of the shell through the flow channel in the chuck and the guide pin arranged in the low-pressure area. The provision of the guide pin enables the liquid to flow completely according to the designed flow channel, effectively reducing the possibility of leakage.

[0021] Preferably, the isolation sleeve is made of carbon fiber reinforced polyetheretherketone material. Carbon fiber reinforced peek (polyetheretherketone) has good heat resistance, and the allowable temperature for continuous use is up to 250°C. It can be made into a thin-walled container that is corrosion-resistant, impact-resistant, wear-resistant, and pressure-resistant. The characteristics of the vortex pump are small flow and high head, small driving motor power, and low pump efficiency. If the end isolation sleeve of the magnetic vortex pump is made of metal, then the metal isolation sleeve will generate eddy heat in the generated rotating magnetic field. Since the vortex pump is a small flow transmission, the medium circulation volume inside the isolation sleeve is very small, and the circulating medium cannot take away all the eddy heat generated by the isolation sleeve. The temperature inside the pump gradually increases, causing the internal parts of the pump to deform due to thermal expansion, which in turn causes the pump to fail to work normally. If the flow rate of the circulating medium in the isolation sleeve is increased, the hydraulic loss inside the pump is large, and the flow rate and head of the pump cannot reach the design parameters; if a non-metallic carbon fiber reinforced peek is used, the isolation sleeve will not generate eddy heat in the rotating magnetic field, which can effectively improve the pump efficiency. In addition, the carbon fiber reinforced peek isolation sleeve only needs to be molded, which greatly saves machining time and saves raw materials.

[0022] The working principle of the present invention is:

[0023] During startup, the motor drives the outer rotor to rotate. The rotation of the outer rotor forms a magnetic field. The magnetic field force passes through the isolation sleeve and directly acts on the inner rotor, causing the inner rotor to rotate under the action of the magnetic field force. The rotation of the inner rotor will drive the fixedly connected pump shaft and impeller to rotate synchronously, realizing power transmission without direct contact.

[0024] At the same time, the rotation of the impeller will suck the air in the pipeline into the annular flow channel and mix it with the liquid stored in the liquid storage area to form a gas-liquid mixture. When the gas-liquid mixture follows the rotation of the impeller to the gas-liquid separation chamber, due to the sudden change in volume, the air will leave the magnetically driven self-priming vortex pump from the liquid outlet of the gas-liquid separation chamber, and the liquid will flow back into the annular flow channel from the reflux port connected to the annular flow channel and mix with the air again. After a period of exhaust, the air in the pipeline connected to the liquid inlet is completely discharged, completing self-priming, and then starts to work normally (pumping liquid).

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Through the cooperation of the outer rotor, the inner rotor and the isolation sleeve, the rotation is driven by magnetic force, which can avoid the possibility of leakage caused by the dynamic seal used in the mechanical transmission process, and the rotation of the inner rotor is transmitted to the impeller through the pump shaft, so that the impeller rotates synchronously, realizing the pumping function of the vortex pump. The dynamic seal in the prior art is replaced with a static seal, and the sealing cooperation of the isolation sleeve and the sealing gasket can prevent the liquid entering the pump from leaking, overcoming the problems of running, bubbling, dripping and leaking, and can be applied to the transportation of flammable, explosive, harmful, toxic and rare and precious liquids.

[0027] 2. The vortex pump can complete the self-priming function through the liquid remaining in the liquid storage area and the reflux port connecting the gas-liquid separation chamber and the annular flow channel; and a liquid flow channel is set between the high-pressure area and the low-pressure area near the outlet of the annular flow channel, which passes through the chuck, pump shaft, isolation sleeve and other components in turn, and can complete the cooling of multiple components. The cooling will automatically occur under the action of the pressure difference after the motor is driven to rotate, without the need for additional external components or devices, which can reduce the investment in equipment.

[0028] 3. The isolation sleeve is made of carbon fiber reinforced peek material, which has good heat resistance, corrosion resistance, impact resistance, wear resistance and pressure resistance, and does not generate eddy heat in the magnetic field, so that the inside of the pump does not generate a lot of heat due to the effect of the magnetic field on the isolation sleeve, so that the pump of the present invention can use its own small flow circulation (the aforementioned liquid flow channel) to achieve cooling. At the same time, the carbon fiber reinforced peek material can be made by compression molding, which is convenient and simple, can greatly improve production efficiency, and reduce material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic side cross-sectional view of the magnetically driven self-priming vortex pump of the present invention;

[0030] Figure 2 It is a front cross-sectional view of the magnetically driven self-priming vortex pump of the present invention ( Figure 1 AA section) structural diagram;

[0031] In the figure: 1- pump cover; 2- impeller; 3- pump body; 4- guide pin; 5- front seat plate; 6- bearing thrust ring; 7- bearing outer ring; 8- shaft sleeve; 9- bearing inner ring; 10- rear seat plate; 11- inner rotor; 12- isolation sleeve; 13- outer rotor; 14- bracket; 15- sealing gasket; 16- O-ring; 17- pump shaft; 18- round nut; 19- motor; 20- chuck; 21- liquid inlet; 22- gas-liquid separation chamber; 23- reflux port; 24- liquid outlet; 25- liquid storage area. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] A magnetically driven self-priming vortex pump, such as Figure 1 and Figure 2 As shown, it includes a shell, a pump cover 1 is fixedly connected to the front end of the shell to form an annular flow channel, and a motor 19 is fixedly connected to the rear end of the shell; the shell includes a pump shaft 17 fixed to the shell by a chuck 20, an impeller 2 keyed to the front end of the pump shaft 17 and located in the annular flow channel, an inner rotor 11 fixed to the rear end of the pump shaft 17, an outer rotor 13 keyed to the motor 19, and an isolation sleeve 12 arranged between the inner rotor 11 and the outer rotor 13 and fixed to the shell; the shell is provided with a liquid inlet 21 and a liquid outlet section communicated with the annular flow channel, and the liquid outlet section includes a gas-liquid separation chamber 22 communicated with the annular flow channel, and a reflux port connecting the gas-liquid separation chamber 22 and the annular flow channel 23 and a liquid outlet 24 arranged on the gas-liquid separation chamber 22; a liquid storage area 25 formed by the shell and the pump cover 1 is provided at the lower end of the impeller 2; the motor 19 drives the outer rotor 13 to rotate, and the magnetic field force generated by the outer rotor 13 pushes and pulls the inner rotor 11 to rotate the inner rotor 11, thereby driving the pump shaft 17 and the impeller 2 to rotate synchronously (magnetic drive); the air sucked in by the liquid inlet 21 is mixed with the liquid stored in the liquid storage area 25, and the gas-liquid mixture is transported to the gas-liquid separation chamber 22 under the rotation of the impeller 2, the air leaves from the liquid outlet 24, and the liquid returns to the annular flow channel through the reflux port 23 until the air is completely exhausted (self-priming), and the magnetically driven self-priming vortex pump starts to work normally.

[0035] More specifically, in this embodiment:

[0036] From front to back ( Figure 1 The pump cover 1, pump body 3, bracket 14 and motor 19 are arranged in sequence (from left to right in the figure); the pump cover 1 is fixed to the front end of the pump body 3 by bolts, and an annular flow channel is formed between the two to accommodate the impeller 2 and allow the liquid to flow, as well as a liquid storage area 25 that can automatically store the liquid; the rear end of the pump body 3 is fixedly connected to the front end of the bracket 14 by bolts; the rear end of the bracket 14 is fixedly connected to the motor 19. The impeller 2 arranged in the annular flow channel has 48 blades evenly arranged on both sides along the circumferential direction (similar to the impeller 2 of an ordinary vortex pump, the blades are only arranged on the outer edge of the impeller 2), and its lower part extends into the liquid storage area 25, so that when the impeller 2 rotates, it can bring up the liquid stored therein. The impeller 2 is fixed to the pump shaft 17 by key fitting, and can rotate together with the pump shaft 17. As shown Figure 2As shown, the liquid inlet 21 and the gas-liquid separation chamber 22 at the top of the pump body 3 are respectively connected to the annular flow channel. In order to allow the incoming liquid to completely pass through the annular flow channel to obtain large kinetic energy, a baffle is provided between the liquid inlet 21 and the gas-liquid separation chamber 22. At the same time, it is required that the baffle does not affect the rotation of the impeller 2. Therefore, only a small gap is left between the baffle and the impeller 2. In this way, when the impeller 2 rotates counterclockwise (the structure shown in the figure), the liquid flows from the liquid inlet 21 to the annular flow channel and then moves along the rotation direction of the impeller 2, and does not directly leave the pump from the liquid outlet 24. A baffle is also provided in the gas-liquid separation chamber 22, so that when the magnetically driven self-priming vortex pump is started, the gas-liquid mixture obtained by mixing the inhaled air with the liquid stored in the liquid storage area 25 will first go up along the baffle and when approaching the liquid outlet 24, due to the sudden increase in volume, the air will continue to move forward and leave from the liquid outlet 24, while the liquid will flow back over the baffle, and the liquid flowing to the right side of the baffle will return to the annular flow channel through the reflux port 23 connecting the annular flow channel and the gas-liquid separation chamber 22, and mix with the gas again until the gas in the pipeline connected to the liquid inlet 21 is discharged cleanly (self-priming), and then enters the normal working stage. A flange is provided at the end of the liquid inlet 21 and the liquid outlet 24 to facilitate the connection with other pipelines. A pair of supporting feet is provided at the lower part of the pump body 3, which can complete the support of the magnetically driven vortex pump together with the fixed points of the motor 19 and the bracket 14.

[0037] A pair of bearings are sleeved on the outside of the pump shaft 17. The bearings are fixed near the front and rear ends of the pump shaft 17. They can fix and support the pump shaft 17, and can reduce the friction coefficient during the rotation of the pump shaft 17, reduce the speed loss (kinetic energy loss) caused by friction, and at the same time ensure the rotation accuracy of the pump shaft 17, thereby avoiding the impeller 2 from moving around. The bearing is fixed on the chuck 20 through the positioning pin, and the chuck 20 is fixed on the pump body 3 through the guide pin 4, thereby achieving the fixation of the pump shaft 17. The bearing can be divided into a bearing outer ring 7 and a bearing inner ring 9. The bearing inner ring 9 is directly sleeved on the outside of the pump shaft 17, and the bearing outer ring 7 is sleeved on the outside of the bearing inner ring 9. The bearing outer ring 7 and the bearing inner ring 9 are both made of SiC material, which has good wear resistance and corrosion resistance. In addition, its high hardness and electrical conductivity can further improve the sealing effect and bearing performance. In addition to the bearing, the front seat plate 5, the bearing thrust ring 6, the shaft sleeve 8 and the rear seat plate 10 are also sleeved on the outside of the pump shaft 17. Among them, a pair of bearing thrust rings 6 are provided, which are respectively against the outside of the bearing outer ring 7 (the outside here refers to: the front end of the bearing outer ring 7 close to the front end, and the rear end of the bearing outer ring 7 close to the rear end), and are sleeved on the outside of the bearing inner ring 9. The bearing thrust ring 6 is provided to bear the axial force; the shaft sleeve 8 is provided between the bearings, and the front seat plate 5 and the rear seat plate 10 are respectively against the outside of the bearing thrust ring 6 (the outside here refers to: the front end of the bearing thrust ring 6 close to the front end, and the rear end of the bearing thrust ring 6 close to the rear end), and cooperate with each other to fix the various components sleeved on the pump shaft 17. Specifically, the front end of the pump shaft 17 is an impeller 2 that is keyed, and the rear end is an inner rotor 11 that is fixed by a key and a round nut 18. The front seat plate 5, the bearing thrust ring 6, the bearing, the sleeve 8, the bearing, the bearing thrust ring 6 and the rear seat plate 10 are sleeved on the outer side of the pump shaft 17 between the impeller 2 and the inner rotor 11 in sequence, and they are easily fixed by abutting each other. An O-ring 16 is also sleeved on the pump shaft 17 inside the bearing inner ring 9 to further provide sealing capability.

[0038] Corresponding to the inner rotor 11, an outer rotor 13 is arranged on the outer side (rear end) thereof without contact. The outer rotor 13 is fixed to the motor 19 by key fitting. There is also an isolation sleeve 12 between the outer rotor 13 and the inner rotor 11. The isolation sleeve 12 is in the shape of a "J" as a whole. Its two ends are fixed by the bracket 14 against the rear end of the pump body 3. The middle part is blocked between the outer rotor 13 and the inner rotor 11 to complete the closed space on the inner rotor 11 side. In order to further improve the airtightness, a sealing gasket 15 is arranged between the isolation sleeve 12 and the pump body 3 and between the pump cover 1 and the pump body 3 to completely block the leakage of the liquid. The outer rotor 13 and the inner rotor 11 are made of magnetic materials, so that the outer rotor 13 can generate a magnetic field after the motor 19 drives it to rotate, thereby driving the inner rotor 11 to rotate (contactless power transmission), and static sealing can be achieved; at the same time, the isolation sleeve 12 is made of non-magnetic material to prevent it from changing or moving under the action of the magnetic field. Specifically, it is made of carbon fiber reinforced polyetheretherketone (peek) material. Since the vortex pump is characterized by small flow rate and high head, the power of the driving motor 19 is usually small and the pump efficiency is low. If the isolation sleeve 12 is made of metal, eddy heat will be generated in the magnetic field formed by the rotation of the outer rotor 13. The generated heat cannot be cooled by the circulation of a small flow rate, and the temperature inside the pump body 3 will continue to rise, causing the various components to expand and deform under the action of heat, resulting in the pump being unable to work normally. Under the premise of not changing the material, in order to overcome the internal high temperature, it is necessary to increase the flow rate of the internal circulation, and then its hydraulic performance will be The isolation sleeve 12 made of non-metallic carbon fiber reinforced peek will not generate eddy current heat in the rotating magnetic field formed, so there is no need to cool the isolation sleeve 12, and its own performance is excellent, the heat resistance is good, the allowable temperature for continuous use is up to 250°C, and it can be manufactured into corrosion-resistant, impact-resistant, wear-resistant and pressure-resistant thin-walled parts through simple compression molding. It has high production efficiency and low production cost, and is suitable for use in the magnetically driven self-priming vortex pump of this embodiment.

[0039] When the impeller 2 rotates and does work (that is, when the magnetically driven self-priming vortex pump is working), the blades on the impeller 2 will transfer the rotational energy to the liquid entering the flow channel, and the energy transfer process will be carried out through the momentum exchange of the three-dimensional flow. The energy will be repeatedly transferred in the flow channel of the entire pump. The longitudinal vortex of the liquid gains energy every time it passes through the impeller 2 in the flow channel. After multiple superpositions, the longitudinal vortex will have strong internal energy. At the pump outlet, it will convert the stored energy into pressure energy and kinetic energy to pump the liquid to the next position.

[0040] The pump shaft 17 generates heat when it rotates, so a liquid flow path is designed inside the pump body 3 and the bracket 14. The liquid flow path starts from the high-pressure area of ​​the annular flow path (i.e., the position close to the outlet of the annular flow path), passes through the guide pin 4, the flow path in the chuck 20, the flow path in the pump shaft 17, the flow path in the isolation sleeve 12, and then flows into the low-pressure area of ​​the annular flow path through the flow path in the chuck 20 and the guide pin 4. For specific flow paths, please refer to Figure 1 , the liquid will enter the guide pin 4 from the upper end of the annular flow channel, and flow through the flow channel inside the chuck 20 to the junction of the chuck 20 and the bearing. At this time, the liquid will lubricate the bearing to further reduce the loss of kinetic energy, and then enter the pump shaft 17 and flow along the flow channel inside the pump shaft 17 to achieve cooling of the inside of the pump shaft 17. The liquid then flows out of the flow channel of the pump shaft 17 from the rear end of the pump shaft 17 and enters the flow channel of the isolation sleeve 12. In order to facilitate the diversion of the liquid and ensure the strength of the isolation sleeve 12, the isolation sleeve 12 at the outlet of the flow channel of the pump shaft 17 adopts a thickened and obtuse top. The liquid entering the flow channel of the isolation sleeve 12 will continue to flow through the gap between the isolation sleeve 12 and the inner rotor 11, and cool the outside of the pump shaft 17 and the inner rotor 11 and other components. Finally, it will flow from the flow channel of the chuck 20 at the bottom of the chuck 20 through the guide pin 4 corresponding to the lower end of the annular flow channel and return to the annular flow channel to complete the cooling cycle. Since the liquid flows back to the inner flow channel through the guide pin 4, the possibility of leakage of this part of the liquid can be effectively reduced. At the same time, the setting of the isolation sleeve 12 and the setting of the sealing gasket 15 can prevent the leakage of the liquid. In addition, after the impeller 2 rotates, high pressure and low pressure will be automatically formed inside the annular flow channel, so the circulation of the liquid inside the liquid flow channel can be realized without the help of external force.

[0041] The working mode of the magnetically driven self-priming vortex pump of this embodiment is as follows: after starting the motor 19, the outer rotor 13 rotates under the drive of the motor 19 to form a magnetic field. The magnetic field force directly acts on the inner rotor 11 through the isolation sleeve 12 to rotate the inner rotor 11. The rotational power can be transmitted to the impeller 2 through the key-matched pump shaft 17, so that the impeller 2 also rotates synchronously. Under the rotation of the impeller 2, the air in the external pipe connected to the liquid inlet 21 will be drawn into the pump body 3, and mixed with the liquid stored in the liquid storage area 25 (when installed for the first time, the liquid can be added to the liquid storage area 25 through the liquid inlet 21. After use, due to its own structure, part of the liquid will be automatically retained in the liquid storage area 25, and it is not necessary to add it every time) to form a gas-liquid mixture. Then, the gas-liquid mixture is sent to the gas-liquid separation chamber 22 under the action of the impeller 2. In the case of a sudden increase in volume, the gas-liquid mixture is separated, and the air will continue to flow upward from the liquid outlet 24, while the liquid will return to the annular flow channel from the reflux port 23 and remix with the air. After a period of time, the air will be completely discharged, and the magnetically driven self-priming vortex pump will start to work normally. At this time, the gas-liquid separation chamber 22 and the reflux port 23 will be filled with liquid.

[0042] The working principle of the present invention is:

[0043] During startup, the motor 19 drives the outer rotor 13 to rotate. The rotation of the outer rotor 13 forms a magnetic field. The magnetic field force passes through the isolation sleeve 12 and directly acts on the inner rotor 11, thereby causing the inner rotor 11 to rotate under the action of the magnetic field force. The rotation of the inner rotor 11 will drive the fixedly connected pump shaft 17 and impeller 2 to rotate synchronously, thereby realizing power transmission without direct contact.

[0044] At the same time, the rotation of the impeller 2 will suck the air in the pipeline into the annular flow channel and mix it with the liquid stored in the liquid storage area 25 to form a gas-liquid mixture. When the gas-liquid mixture rotates with the impeller 2 to the gas-liquid separation chamber 22, due to the sudden change in volume, the air will leave the magnetically driven self-priming vortex pump from the liquid outlet 24 of the gas-liquid separation chamber 22, and the liquid will flow back into the annular flow channel from the reflux port 23 connected to the annular flow channel and mix with the air again. After a period of exhaust, the air in the pipeline connected to the liquid inlet 21 is completely discharged, completing self-priming, and then starting normal work (pumping liquid).

[0045] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A magnetically driven self-priming vortex pump, characterized in that: It comprises a housing, the front end of which is fixedly connected to a pump cover (1) to form an annular flow channel, and the rear end of which is fixedly connected to a motor (19); The housing includes a pump shaft (17) fixed to the housing via a chuck (20), an impeller (2) keyed to the front end of the pump shaft (17) and located in the annular flow channel, an inner rotor (11) fixed to the rear end of the pump shaft (17), an outer rotor (13) keyed to the motor (19), and an isolation sleeve (12) disposed between the inner rotor (11) and the outer rotor (13) and fixed to the housing; The shell is provided with a liquid inlet (21) communicating with the annular flow channel and a liquid outlet section, the liquid outlet section comprising a gas-liquid separation chamber (22) communicating with the annular flow channel, a reflux port (23) communicating with the gas-liquid separation chamber (22) and the annular flow channel, and a liquid outlet (24) provided on the gas-liquid separation chamber (22); the lower end of the impeller (2) is provided with a liquid storage area (25) formed by the shell and the pump cover (1); The motor (19) drives the outer rotor (13) to rotate. The magnetic field force generated by the outer rotor (13) pushes and pulls the inner rotor (11) to rotate the inner rotor (11), thereby driving the pump shaft (17) and the impeller (2) to rotate synchronously. The air sucked in from the liquid inlet (21) is mixed with the liquid stored in the liquid storage area (25). The gas-liquid mixture is transported to the gas-liquid separation chamber (22) under the rotation of the impeller (2). The air leaves from the liquid outlet (24), and the liquid returns to the annular flow channel through the reflux port (23). After the air is completely exhausted, the magnetically driven self-priming vortex pump starts to work normally. The housing comprises a pump body (3) and a bracket (14) which are fixedly connected; the pump cover (1) is fixedly connected to the front end of the pump body (3), together forming an annular flow channel and a liquid storage area (25); the rear end of the bracket (14) is fixedly connected to the motor (19); the liquid inlet (21) and the liquid outlet section are both arranged on the pump body (3); the bracket (14) presses the isolation sleeve (12) against the rear end of the pump body (3); A sealing gasket (15) is provided between the pump cover (1) and the pump body (3), and between the pump body (3) and the isolation sleeve (12); A pair of bearings are sleeved on the outer side of the pump shaft (17); The housing is also provided with a liquid flow channel, the liquid flow channel comprising a guide pin (4) for fixing the chuck (20) on the housing, a flow channel in the chuck, a flow channel in the pump shaft, and a flow channel in the isolation sleeve; the liquid enters the guide pin (4) from the upper end of the annular flow channel, passes through the chuck flow channel inside the chuck (20), and first flows to the junction between the chuck (20) and the bearing, at which time the liquid lubricates the bearing to further reduce the loss of kinetic energy, and then enters the pump shaft (17) and flows along the flow channel in the pump shaft In order to realize cooling of the inside of the pump shaft (17), the liquid then flows out of the pump shaft inner flow channel from the rear end of the pump shaft (17) and enters the inner flow channel of the isolation sleeve. The liquid entering the inner flow channel of the isolation sleeve continues to flow through the gap between the isolation sleeve (12) and the inner rotor (11), thereby cooling the outside of the pump shaft (17) and the inner rotor (11). Finally, the liquid flows from the chuck inner flow channel at the bottom of the chuck (20) through the guide pin (4) corresponding to the lower end of the annular flow channel and returns to the annular flow channel, thereby completing the cooling cycle.

2. A magnetically driven self-priming vortex pump according to claim 1, characterized in that: 40 to 56 blades are evenly arranged on both sides of the impeller (2) along the circumferential direction.

3. A magnetically driven self-priming vortex pump according to claim 1, characterized in that: The bearing is fixed on the chuck (20) via a positioning pin.

4. A magnetically driven self-priming vortex pump according to claim 3, characterized in that: The bearing comprises a bearing inner ring (9) sleeved on the outside of the pump shaft (17) and a bearing outer ring (7) sleeved on the outside of the bearing inner ring (9); the bearing outer ring (7) is fixed to the chuck (20) via a positioning pin.

5. A magnetically driven self-priming vortex pump according to claim 4, characterized in that: The pump shaft (17) is also sleeved with a front seat disc (5), a bearing thrust ring (6), a shaft sleeve (8) and a rear seat disc (10) on the outside. The shaft sleeve (8) is arranged between the bearings. A pair of bearing thrust rings (6) are arranged respectively on the outside of the bearings. The front seat disc (5) and the rear seat disc (10) are respectively arranged on the outside of the bearing thrust ring (6).

6. A magnetically driven self-priming vortex pump according to claim 5, characterized in that: A plurality of O-rings (16) are sleeved on the inner side of the bearing inner ring (9) on the pump shaft (17).

7. A magnetically driven self-priming vortex pump according to claim 1, characterized in that: The isolation sleeve (12) is made of carbon fiber reinforced polyetheretherketone material.

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