CN212454839U - Multi-stage pump capable of reducing fluid resistance - Google Patents

Abstract

The utility model discloses a reduce fluid resistance's multistage pump, include the shell, install in drive stator assembly, the rotor assembly of shell, drive stator assembly includes two at least drive stators that distribute along the shell axial, the rotor assembly includes multistage impeller module, every level impeller module includes the rotor and installs in the impeller subassembly of rotor in multistage impeller module, and every drive stator provides the pivoted drive power for the rotor of the one-level impeller module that corresponds, controls the rotational speed that corresponds the rotor through setting up different voltages to different drive stators, realizes that multistage impeller module differential rotates. The utility model discloses not only realized multistage pressure boost transmission and reduced the fluid resistance, improved the lift of pump, the noise that the rotational speed change between the multistage impeller made fluid vary voltage to arouse moreover is showing to reduce.

Description

Multi-stage pump capable of reducing fluid resistance

Technical Field

The utility model belongs to the technical field of the water pump, the multistage differential shaftless water pump of magnetic suspension specifically says so, can extensively be used for the transport of water, can be used to water conservancy trade, water and electricity trade, sewage treatment trade etc..

Background

Water pumps are machines that deliver or pressurize a liquid. The energy-increasing device transmits the mechanical energy of a prime motor or other external energy to liquid, increases the energy of the liquid, is mainly used for conveying the liquid including water, oil, acid-base liquid, emulsion, suspoemulsion, liquid metal and the like, is the most common industrial equipment in modern industrial production, and plays an important role in almost all fields of modern industry.

Water pumps are divided into displacement pumps and vane pumps. The vane pump comprises a centrifugal pump, an axial flow pump, a mixed flow pump and the like, and is structurally provided with an impeller and a pump shaft, the pump shaft is driven by an output shaft of a motor, and the impeller rotates to achieve the function of the water pump. Because the high-speed operation of impeller and pump shaft has brought all sorts of drawbacks of traditional water pump: such as low conversion efficiency, high power consumption, limited lift, easy damage of the bearing, frequent maintenance, great noise, etc. The shaftless water pump is developed, the defects can be solved, and the effects of high efficiency, energy conservation, durability and environmental protection are achieved. Patent CN205225763U has announced a shaftless pump, and it combines through fixed pipeline and rotation pipeline, adopts two sets of load bearing and rotation pipeline normal running fit simultaneously, and the location bearing setting is in the recess that mutually supports and corresponds, and the displacement of restriction pipeline makes the water pump operation more stable. Patent CN1138919C discloses a shaftless sealed rotor tandem pipe pump. It comprises a hollow housing, an annular rotor rotatably mounted within the housing, and an annular stator fixedly mounted within the housing and surrounding the rotor. Patent CN102619788A discloses an integrated shaftless motor axial-flow pump. This pump both ends are equipped with flange's pump casing, are equipped with the pump impeller between two parties in the inside cavity of pump casing, are located the inside cavity of the pump casing of axial-flow pump downstream side and are equipped with the stator, be equipped with the solid fixed ring of rotor on the outer fringe of pump impeller, the assembly of driving motor rotor is on the solid fixed ring of rotor, and the solid fixed ring of rotor is fixed at pump casing inboard through solid fixed ring bearing, and the inboard position that corresponds with the driving motor rotor of pump casing is equipped with the recess, is equipped with the driving motor stator in this recess. Patent CN102055277A discloses a shaftless motor for use with a mud pump. The rotor of the motor is internally provided with a mounting cavity, and the outside of the rotor is sequentially provided with rotor auxiliary iron; permanent magnets are uniformly distributed on the outer circle surface of the rotor auxiliary iron at intervals of N, S stages, a winding stator is arranged outside the permanent magnets, a casing is arranged outside the stator, two ends of the casing are respectively and fixedly connected with an inner end cover and an outer end cover, and the inner end cover is fixed on equipment by a device spigot.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a reduce fluid resistance's multistage pump is provided, realize multistage pressure boost transmission and reduce fluid resistance to can further noise reduction.

In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a reduce fluid resistance's multistage pump, includes the shell, installs in the drive stator assembly, the rotor assembly of shell, drive stator assembly includes along two at least drive stators of shell axial distribution, the rotor assembly includes multistage impeller module, every level impeller module includes the rotor and installs in the impeller subassembly of rotor in multistage impeller module, and every drive stator provides the pivoted power of driving for the rotor of the one-level impeller module that corresponds, and the rotational speed that corresponds the rotor is controlled through setting up different voltages to different drive stators, realizes that multistage impeller module differential rotates.

Preferably, the rotor comprises a cylindrical steel ring and a plurality of permanent magnet steels uniformly distributed and installed along the circumferential direction of the cylindrical steel ring.

Preferably, the impeller assembly comprises an impeller, a front cover plate and a reducing flow guide body, the front cover plate and the reducing flow guide body are respectively covered on the front side and the rear side of the impeller, and the reducing flow guide body is connected with the cylindrical steel ring.

Preferably, the cylinder steel ring is connected with the reducing flow guide body through a bolt body structure, the inner side of the cylinder steel ring is provided with a reducing flow guide body mounting groove, the reducing flow guide body comprises a reducing flow guide body rear cover, the outer side of the reducing flow guide body rear cover is provided with a fastening body structure mounting groove, and the fastening body structure is embedded in the fastening body structure mounting groove and the reducing flow guide body mounting groove.

Preferably, the rotor assembly is still including being located multistage impeller module front side from inhaling the formula impeller module, it includes from inhaling the formula impeller module rotor and impeller component, the center of inhaling the formula impeller module's front shroud is equipped with from the suction inlet, the impeller of inhaling the formula impeller module is connected with from inhaling the impeller shaft, stretch out forward and be connected with from inhaling the blade from inhaling the mouth from inhaling the impeller shaft, drive stator assembly is still including corresponding a drive stator who inhales the rotor setting of formula impeller module.

Preferably, between self-suction impeller module and the multistage impeller module, rotate through the impeller module connector and connect between the adjacent two-stage of multistage impeller module.

Preferably, the impeller module connector comprises a front flange body, a rear flange body and a ball bearing, the ball bearing comprises a bearing outer ring, a ball and a bearing inner ring, the front flange body is fixed with a cylindrical steel ring of the front side rotor and fixed with the bearing outer ring, and the rear flange body is fixed with the cylindrical steel ring of the rear side rotor and fixed with the bearing inner ring.

Preferably, the side wall of the front flange body is provided with a bearing front fixing hole, the side wall of the rear flange body is provided with a bearing rear fixing hole, the front flange body is fixed with a bearing outer ring bolt through the bearing front fixing hole, and the rear flange body is fixed with a bearing inner ring bolt through the bearing rear fixing hole.

Preferably, the front end face and the rear end face of the cylinder steel ring are correspondingly provided with flange mounting grooves embedded with the front flange body and the rear flange body, the front wall of the front flange body is provided with a front flange hole, the rear wall of the rear flange body is provided with a rear flange hole, the front flange body is fixed with a flange mounting groove on the front rotor through the front flange hole by bolts, and the rear flange body is fixed with a flange mounting groove on the rear rotor through the rear flange hole by bolts.

Preferably, the front end face and the rear end face of the cylindrical steel ring are provided with annular grooves which are embedded with the ball bearings.

The utility model discloses a technical scheme, following beneficial effect has:

the driving stators provide rotating driving force for the rotor under the action of current, different voltages are set for different driving stators to control the rotating speed of the corresponding rotor, so that differential rotation of the multistage impeller module is realized, multistage supercharging transmission is realized, fluid resistance is reduced, and the pump lift is improved; and the noise caused by the pressure change of the fluid is obviously reduced due to the change of the rotating speed among the multi-stage impellers.

The specific technical solution and the advantages of the present invention will be described in detail in the following detailed description with reference to the accompanying drawings.

Drawings

The invention will be further described with reference to the accompanying drawings and specific embodiments:

fig. 1 is an overall structure diagram of a magnetic suspension multistage differential shaftless water pump provided by the present invention, wherein arrows indicate the flow of fluid passing through the pump when the pump is in operation;

fig. 2 is an expanded view of the overall structure of a magnetic suspension multistage differential shaftless water pump provided by the present invention;

FIG. 3 is a cross-sectional view of the housing;

FIG. 4 is an expanded view of the housing;

FIG. 5 is a cross-sectional view of the rear housing;

FIG. 6 is a rear housing expanded view;

FIG. 7-1 is a first schematic view of the barrel deployment;

FIG. 7-2 is a second schematic view of the barrel deployment;

FIGS. 7-3 are axial views of the barrel;

FIGS. 7-4 are isometric views of the cartridge;

FIG. 8-1 is a front view of the rotor assembly;

FIG. 8-2 is a cross-sectional view taken along line A-A of FIG. 8-1;

FIG. 9-1 is a first schematic view of the rear impeller body in an expanded configuration;

FIG. 9-2 is a radial schematic view of the assembled rear impeller body;

FIG. 9-3 is a rear isometric view of the rear impeller body assembly;

FIG. 10 is an expanded schematic view of the self-priming impeller module and the multi-stage impeller module;

FIG. 11 is a schematic deployment view of the rotor;

FIG. 12-1 is an isometric view of a variable diameter baffle;

fig. 12-2 is a radial schematic view of a variable diameter baffle;

fig. 12-3 is an axial schematic view of a variable diameter baffle;

FIG. 13-1 is an expanded schematic view of a self-priming impeller module;

FIG. 13-2 is a second expanded schematic view of the self-priming impeller module;

FIG. 14 is a schematic structural view of a multi-stage impeller module;

FIG. 15-1 is a schematic view of an impeller module interface configuration;

FIG. 15-2 is a schematic view of a fan module interface in expanded view;

in the figure:

the device comprises a rear impeller 1, an impeller tray 2, a rear cover 3, a middle disc 4, a cylinder 5, a front shell 6, a grating 7, a grating flange 8, a front magnetic suspension stator 9, a front permanent magnet 10, a rotor flange 11, a fixing flange 12, a diversion cover 13, a rear permanent magnet 14, a rear magnetic suspension stator 15 and a rear impeller cover 16;

the variable-diameter guide body comprises a cylinder steel ring 20, a variable-diameter guide body rear cover 21, an impeller b22, a front cover plate b23, a bolt structure a26, a bolt structure b27, permanent magnet steel 28 and a bolt 29;

front cover plate a30, self-suction blades 31, impeller a 39;

the structure comprises an electric control box 40, a bolt body 41, a driving stator 42, a bolt closing groove 43, a bolt body groove I44, a bolt body groove II 45, a reducing flow guide body mounting groove 46, a bolt groove 47, a permanent magnet steel mounting groove 48 and a bolt body structure mounting groove 49;

a flange mounting groove 50, a front flange body 51, a bearing outer ring 52, balls 53, a bearing inner ring 54, a rear flange body 55, a front flange hole 56, a bearing front fixing hole 57, a bearing rear fixing hole 58, a rear flange hole 59,

the self-suction impeller comprises a self-suction impeller module a, a multi-stage impeller module b and a rear end impeller body c.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "front," "back," "inner," "outer," "axial," "radial," and the like, which refer to orientations or positional relationships, are based only on the orientations or positional relationships shown in the drawings and are used only for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

As shown in fig. 1 and 2, the utility model discloses a multistage differential shaftless water pump of magnetic suspension, including the shell, install in drive stator assembly and magnetic suspension stator, the rotor assembly of shell, be equipped with the circulating water flow channel of front and back intercommunication between rotor assembly and the drive stator assembly, drive stator assembly includes along two at least drive stators 42 of shell axial distribution, the rotor assembly includes magnetic suspension permanent magnet and multistage impeller module b. The rotor assembly is in a magnetic suspension state through the matching of the magnetic suspension stators and the magnetic suspension permanent magnets, each stage of impeller module in the multistage impeller module b comprises a rotor and an impeller assembly arranged on the rotor, and each driving stator provides a rotating driving force for the rotor of the corresponding stage of impeller module. The rotating speed of the corresponding rotor is controlled by setting different voltages for different driving stators, so that the differential rotation of the multistage impeller module is realized.

The magnetic suspension stator is matched with the magnetic suspension permanent magnet to enable the rotor assembly to be in a magnetic suspension state, so that the shaftless design is realized, and the pump is small in size, high in efficiency and long in service life.

Through the differential rotation of the multistage impeller modules, the multistage supercharging transmission is realized, the fluid resistance is reduced, and the pump lift is improved; and the noise caused by the pressure change of the fluid is obviously reduced due to the change of the rotating speed among the multi-stage impellers.

The housing of the magnetic levitation multistage differential shaftless water pump shown in fig. 3 and 4 comprises a front shell 6, a cylinder 5, a middle disc 4 and a rear shell. Wherein, the front shell 6 is connected with the cylinder 5 through bolts. The central disc 4 is connected with the cylinder 5 through bolts. The electronic control box 40 is arranged outside the barrel 5, the barrel 5 is provided with a wiring hole, and a lead penetrates through the wiring hole to be connected with the electronic control box 40. The central disc 4 is connected with the rear shell through bolts and nuts.

The electric control box 40 includes a power output circuit module, a magnetic suspension control module, and a power management module, wherein the power output circuit module controls each driving stator of the driving stator assembly, so that different driving stators set different voltages to control the rotation speed of the corresponding rotor. The magnetic suspension control module controls the magnetic suspension stator to enable the stator and the rotor assembly to keep a rotor suspension state through magnetic force. Furthermore, magnetic suspension control module includes position control system, and position control system and distance sensor and magnetic suspension stator electric connection control magnetic suspension stator's output through accepting the distance value that distance sensor sensed after, and then control the magnetic force between magnetic suspension stator and the rotor and keep the suspension state.

Furthermore, the front shell 6 is provided with a water flow channel inlet, the front end of the water flow channel inlet is provided with a grating step, and the grating 7 is placed on the grating step and fixed by a grating flange 8. The rear end of the water flow channel inlet is provided with a preposed magnetic suspension stator step, and a preposed magnetic suspension stator 9 is arranged on the preposed magnetic suspension stator step.

As shown in fig. 3 to 6, the rear housing includes three parts, namely a flow guide cover 13, an impeller tray 2 and a rear cover 3, and the flow guide cover 13, the impeller tray 2 and the rear cover 3 are connected in a fitting manner. The rear cover 3 is connected with the middle disc 4 through bolts and nuts, and simultaneously fixes the flow guide cover 13 and the impeller tray 2. The center of the rear cover 3 is provided with a water flow channel outlet.

Further, the center of impeller tray 2 is equipped with the supporting hole, impeller tray 2 encircles the supporting hole and is equipped with the annular, install rearmounted magnetic suspension stator 15 on the impeller tray 2, rearmounted magnetic suspension stator 15 gomphosis is installed in the annular.

As shown in fig. 7-1 to 7-4, a plurality of sets of driving stators 42 are axially mounted inside the cylinder 5, and the driving stators 42 are provided with torque windings. The outer side wall of the driving stator 42 is provided with a first bolt body groove 44 and a second bolt body groove 45, the driving stator 42 is embedded with the cylinder 5 through a bolt body 41, the inner wall of the cylinder is provided with a bolt groove 43, and the bolt body 41 is bolted with the first bolt body groove 44, the second bolt body groove 45 and the bolt groove 43 to fix the driving stator 42 and the cylinder 5.

Further, the space between the driving stator 42 and the cylinder 5 is filled with a waterproof and nonconductive filler.

As shown in fig. 8-1 and 8-2, the rotor assembly of the magnetic levitation multistage shaftless water pump includes a front permanent magnet 10, a rear permanent magnet 14, a self-suction impeller module a, a multistage impeller module b, and a rear end impeller body c. The front permanent magnet 10 is installed at the front end of the self-priming impeller module a, and the rear permanent magnet 14 is installed at the rear end of the rear impeller body c.

As shown in fig. 9-1 to 9-3, the rear impeller body c includes a rear impeller cover 16, a rear impeller 1, a rotor flange 11, and a fixing flange 12. The fixing flange 12 has a plurality of screw holes distributed on two concentric circles of different diameters. The rear impeller cover 16 is connected with the screw bolt on the outer side of the fixed flange 12, and the rear impeller cover 16 is connected with the rear impeller 1 through the embedded bolt. The rotor flange 11 is connected with the screw holes on the inner side of the fixed flange 12 through bolts.

Further, radial protrusions are distributed on the periphery of the rear impeller 1 along the circumferential direction, caulking grooves are correspondingly distributed on the periphery of the rear impeller cover 16 along the circumferential direction, and the radial protrusions are embedded into the caulking grooves. The rear end ring of the rear impeller 1 is provided with a ring groove around the impeller shaft, and the rear permanent magnet 14 is embedded and installed in the ring groove of the rear impeller. The impeller shaft of the rear impeller is supported by the support hole.

As shown in fig. 10, the self-priming impeller module a is connected in series with the multi-stage impeller module b.

As shown in fig. 11, the self-suction impeller module a and the multi-stage impeller module b are each provided with a rotor. The rotor comprises a cylindrical steel ring 20 and a plurality of permanent magnet steels 28 uniformly distributed and installed along the circumferential direction of the cylindrical steel ring 20. The outer side of the cylinder steel ring 20 is provided with a permanent magnet steel mounting groove 48, the inner side is provided with a reducing flow guide body mounting groove 46, the front side and the rear side are provided with an annular groove 18 and a flange mounting groove 50, the annular groove 18 is located on the radial outer side of the flange mounting groove 50, the annular groove and the flange mounting groove form a step shape, and the rotor flange 11 is embedded with the flange mounting groove 50.

Specifically, the impeller subassembly includes the impeller and covers front shroud and the reducing baffle of locating the impeller front and back side respectively, and the center of front shroud and reducing baffle is equipped with the rivers passway hole that supplies rivers to pass through, the reducing baffle is connected with drum steel ring 20.

As shown in fig. 12-1 to 12-3, the reducing flow conductor is composed of a fastening structure a26, a fastening structure b27 and a reducing flow conductor rear cover 21, a fastening structure mounting groove 49 is formed in the outer side of the reducing flow conductor rear cover 21, and the fastening structure a26 and the fastening structure b27 are installed in the fastening structure mounting groove 49 of the reducing flow conductor rear cover 21 in an embedded manner. The fastening structure b27 is inserted into the cylinder steel ring 20 through the reducing flow guide body installation groove 46 on the inner side of the cylinder steel ring 20, the fastening structure b27 is embedded with the bolt groove 47 on the inner side of the cylinder steel ring 20 through rotation, then the fastening body 29 is inserted into the bolt groove 47 on the inner side of the cylinder steel ring 20, and the design enables the fastening structure reducing flow guide body to be conveniently detached and installed to repair the impeller blade.

As shown in fig. 13-1 and 13-2, the self-priming impeller module a includes an impeller a39, a front cover plate a30, and a self-priming blade 31. The impeller a39 is provided with an impeller shaft, and the self-priming blade 31 is fitted to the impeller shaft of the impeller a39 and fixed by a bolt to form an impeller body. The front cover plate a30 has a self-suction port at the center, and the impeller shaft extends forward from the self-suction port and is connected to a self-suction blade 31. The impeller body, the front cover plate a30 and the reducing guide body rear cover 21 are fixed through the reducing guide body embedded bolts to form the self-suction impeller module a.

Of course, it will be understood by those skilled in the art that the drive stator assembly also includes a drive stator disposed in correspondence with the rotor of the self-priming impeller module. The self-suction impeller module a and the multi-stage impeller module b also rotate in a differential mode.

As shown in fig. 14, the multistage impeller module b includes an impeller b22 and a front shroud b 23. The impeller b22, the front cover plate b23 and the reducing guide body rear cover 21 are fixed through reducing guide body embedded bolts to form the multistage impeller module b.

In order to realize the rotation connection between the self-suction impeller module a and the multi-stage impeller module b, the multi-stage impeller module b independently rotates between all stages, and an impeller module connecting body is further arranged. As shown in fig. 15-1 and 15-2, the impeller module connector includes a front flange body 51, a rear flange body 55, and ball bearings that are fitted into the annular groove 18. The ball bearing includes a bearing outer race 52, balls 53, and a bearing inner race 54. Wherein, the side wall of the front flange body 51 is provided with a bearing front fixing hole 57, the front wall is provided with a front flange hole 56, the side wall of the rear flange body 55 is provided with a bearing rear fixing hole 58, and the rear wall is provided with a rear flange hole 59.

The front flange body 51 is bolted to the flange mounting groove 50 of the cylinder steel ring 20 of the self-suction impeller module a or the multi-stage impeller module b through a front flange hole 56. The rear flange body 55 is bolted to the flange mounting groove 50 of the cylindrical steel ring 20 of the multistage impeller module b through the rear flange hole 59. The front flange body 51 is bolted with the bearing outer ring 52 through a bearing front fixing hole 57, and the rear flange body 55 is bolted with the bearing inner ring 54 through a bearing rear fixing hole 58.

In order to connect the final stage of the multistage impeller module b to the rear end impeller body c, the rotor flange 11 of the rear end impeller body c is supported in the flange mounting groove 50 of the final stage of the multistage impeller module b, and the two are bolted together.

According to the technical scheme, the self-suction type impeller module a and the multi-stage impeller module b are sequentially arranged along the axial direction of the rotor assembly, the self-suction type impeller module a and the multi-stage impeller module b are connected in a rotating mode, and the multi-stage impeller module b is connected in a rotating mode through the impeller module connecting body between each stage, so that the self-suction type impeller module a and the multi-stage impeller module b can independently rotate when the multi-stage impeller module b is connected in the.

The front magnetic suspension stator 9 is matched with the front permanent magnet 10, the rear magnetic suspension stator 15 is matched with the rear permanent magnet 14, and the whole rotor assembly is in a magnetic suspension state through the matching of the magnetic suspension stator and the magnetic suspension permanent magnet, so that the shaftless design is realized. The distance sensor detects the distance between the magnetic suspension stator and the magnetic suspension permanent magnet, and adjusts the output power according to the distance value, specifically, after the distance between the preposed magnetic suspension stator and the preposed magnetic suspension permanent magnet is larger than a threshold value, the magnetic poles of the preposed magnetic suspension stator and the magnetic poles of the magnetic suspension permanent magnet are adjusted to be different, and the rotor is pulled to be within the threshold value range; after the distance between the front magnetic suspension stator and the front magnetic suspension permanent magnet is smaller than a threshold value, adjusting the magnetic pole of the front magnetic suspension stator to be the same as that of the magnetic suspension permanent magnet, and pushing the rotor to be within the threshold value range; the larger the deviation range is, the higher the power of the magnetic suspension stator is.

Because the self-suction impeller module a and the multi-stage impeller module b adopt modularized impeller design, the impeller is easy to replace.

In addition, in the above rotor assembly, an annular circulating water channel is formed between the rotor and the driving stator in the self-suction impeller module a and the multi-stage impeller module b, and the diversion cover 13 is communicated with the water channel inlet, so that friction is reduced while water circulation is realized, and noise and energy consumption are reduced.

Fig. 1 shows the fluid flow path of the magnetic suspension multistage differential shaftless water pump of the present invention during operation. The fluid enters the pump cavity through the water flow channel inlet on the front shell 6, and the water at the front end and the circulating water flow channel is sucked into the pump body through the action of the self-suction blades 31.

Water enters the pump body and is centrifugally driven through the impeller a39 in the self-suction type impeller module a, the water obtains kinetic energy provided by the blades to move towards the periphery of the impeller, the water turns to the back of the impeller a39 through the reducing guide body rear cover 21 and flows into the multistage impeller module b from the outlet of the reducing guide body rear cover 21, and the water sequentially passes through each stage in the multistage impeller module b in the same way, is accelerated for multiple times, and multistage supercharging transmission is realized.

Finally, the water is sent into a flow guide channel of the flow guide cover 13 through the rear impeller 11, the water is divided into two paths in the flow guide channel of the flow guide cover 13, one path flows out through a water flow channel outlet of the rear cover 3, and the other path circulates in the direction of a water flow channel inlet in front through the circulating water flow channel.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. A multistage pump for reducing fluid resistance, comprising: including the shell, install in drive stator assembly, the rotor assembly of shell, drive stator assembly includes along two at least drive stators of shell axial distribution, the rotor assembly includes multistage impeller module, every level impeller module includes the rotor and installs in the impeller subassembly of rotor in multistage impeller module, and every drive stator provides the pivoted drive power for the rotor of the one-level impeller module that corresponds, controls the rotational speed that corresponds the rotor through setting up different voltages to different drive stators, realizes multistage impeller module differential rotation.

2. The multi-stage pump of claim 1, wherein: the rotor comprises a cylindrical steel ring and a plurality of permanent magnet steels which are uniformly distributed along the circumferential direction of the cylindrical steel ring.

3. A multistage pump for reducing fluid resistance as defined in claim 2, wherein: the impeller assembly comprises an impeller, a front cover plate and a reducing flow guide body, wherein the front cover plate and the reducing flow guide body are respectively covered on the front side and the rear side of the impeller, and the reducing flow guide body is connected with a cylindrical steel ring.

4. A multi-stage pump of reduced fluidic resistance as defined in claim 3, wherein: the cylinder steel ring is connected with the reducing flow guide body through a bolt body structure, the inner side of the cylinder steel ring is provided with a reducing flow guide body mounting groove, the reducing flow guide body comprises a reducing flow guide body rear cover, the outer side of the reducing flow guide body rear cover is provided with a fastening body structure mounting groove, and the fastening body structure is embedded in the fastening body structure mounting groove and the reducing flow guide body mounting groove.

5. A multi-stage pump of reduced fluidic resistance as defined in claim 3, wherein: the rotor assembly is still including being located multistage impeller module front side from inhaling the formula impeller module, inhale formula impeller module from the formula impeller module includes rotor and impeller component, the center of inhaling the formula impeller module's front shroud is equipped with from the suction inlet, the impeller of inhaling formula impeller module is connected with from inhaling the impeller shaft, from inhaling the impeller shaft from inhaling the mouth and stretching out forward and be connected with from inhaling the blade, drive stator assembly is still including corresponding a drive stator who inhales the rotor setting of formula impeller module.

6. The multistage pump of claim 5, wherein: between self-suction impeller module and the multistage impeller module, rotate through the impeller module connector between the adjacent two-stage of multistage impeller module and connect.

7. The multi-stage pump of claim 6, wherein: the impeller module connector comprises a front flange body, a rear flange body and a ball bearing, wherein the ball bearing comprises a bearing outer ring, a ball and a bearing inner ring, the front flange body is fixed with a cylindrical steel ring of the front side rotor and fixed with the bearing outer ring, and the rear flange body is fixed with the cylindrical steel ring of the rear side rotor and fixed with the bearing inner ring.

8. The multi-stage pump of claim 7, wherein: the side wall of the front flange body is provided with a bearing front fixing hole, the side wall of the rear flange body is provided with a bearing rear fixing hole, the front flange body is fixed with a bearing outer ring bolt through the bearing front fixing hole, and the rear flange body is fixed with a bearing inner ring bolt through the bearing rear fixing hole.

9. The multi-stage pump of claim 7, wherein: the front end face and the rear end face of the cylinder steel ring are correspondingly provided with flange mounting grooves embedded with the front flange body and the rear flange body, a front flange hole is formed in the front wall of the front flange body, a rear flange hole is formed in the rear wall of the rear flange body, the front flange body is fixed with a flange mounting groove bolt on the front rotor through the front flange hole, and the rear flange body is fixed with a flange mounting groove bolt on the rear rotor through the rear flange hole.

10. The multi-stage pump of claim 7, wherein: and annular grooves embedded with the ball bearings are formed in the front end face and the rear end face of the cylindrical steel ring.

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