CN210949157U - Single-stage high-lift submersible pump - Google Patents

Abstract

The utility model discloses a single-stage high-lift immersible pump, belong to immersible pump technical field, its technical scheme main points are including the motor and the pump body, the pump body includes the pump case and sets up multiunit impeller subassembly and the disk seat in the pump case, the lower extreme of pump case is the end of intaking, the upper end of pump case is the water outlet end, there is the transmission shaft that accesss to into water end and water outlet end respectively along its length direction setting and both ends in the pump case, multiunit impeller subassembly sets gradually on the transmission shaft along transmission shaft length direction, the disk seat sets up in the upper end of transmission shaft, the output of motor is connected and is used for driving multiunit impeller subassembly on. Be provided with first impeller blade and second impeller blade on the impeller, the impeller rotates the in-process, and first impeller blade and second impeller blade rotate simultaneously, and the speed and the diameter of swirl that can flow are improved in the two stack, and then improve impeller assembly's single-stage lift, have increased the lift of whole submersible pump.

Description

Single-stage high-lift submersible pump

Technical Field

The utility model belongs to the technical field of the immersible pump, specificly indicate a high-lift immersible pump of single-stage.

Background

The submersible pump is a water lifting device which is formed by directly connecting a motor and a water pump into a whole and is used for diving, and has the advantages of simple structure, high unit efficiency, safe and reliable operation, convenient installation and maintenance and the like. It is suitable for extraction from deep well, hot well, river, reservoir, canal, etc. and is used mainly in irrigation of farm land, water for people and animals in plateau and mountain area, and for water drainage in city, factory, railway, mine and building site.

In the impeller structure of some existing submersible pumps, the flow separation of blades generated by stirring water flow is large and the vortex is more during operation, so that the flow loss of the water flow is large, the single-stage lift of the impeller structure is not high, more impeller assemblies need to be connected in series for achieving the requirement, and the impeller assemblies can influence the stable operation of the whole impeller structure after reaching a certain number.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a higher immersible pump of single-stage lift to the technical problem that above-mentioned exists to the guarantee immersible pump is long-time to the operation.

The purpose of the utility model is realized like this: a single-stage high-lift submersible pump comprises a motor and a pump body, wherein the pump body comprises a pump shell, a plurality of groups of impeller assemblies and valve seats, the impeller assemblies and the valve seats are arranged in the pump shell, the lower end of the pump shell is a water inlet end, the upper end of the pump shell is a water outlet end, a transmission shaft is arranged in the pump shell along the length direction of the pump shell, two ends of the transmission shaft are respectively communicated with the water inlet end and the water outlet end, the impeller assemblies are sequentially arranged on the transmission shaft along the length direction of the transmission shaft, the valve seats are arranged at the upper end part of the transmission shaft, and the output end of the motor is connected to the transmission shaft;

impeller subassembly includes that the cavity was seted up to the lower extreme the stator and is located impeller seat and the impeller of stator cavity, the impeller set up in the upper end of impeller seat, the impeller seat the impeller and there is the opening that runs through the setting on the stator, be provided with the cover on the opening of impeller and locate the axle sleeve of transmission shaft, the both ends of axle sleeve lead to respectively the opening of impeller seat and the opening of stator, opening on the impeller seat with clearance between the axle sleeve forms first water inlet, opening on the stator with clearance between the axle sleeve forms the third mouth of a river, still be provided with on the impeller with the impeller seat with the second water inlet that the third mouth of a river on the stator is linked together.

By adopting the technical scheme, the impeller assembly mainly comprises the guide vane, an impeller seat and the impeller, the impeller seat plays a role in supporting the impeller, and the guide vane provides a sealed environment for the impeller; the transmission shaft is driven to rotate by the motor, so that the impeller on the impeller assembly is driven to rotate, in the process, water flows into the pump shell from the water inlet end below the pump shell, then enters between the impeller and the impeller seat from the first water inlet, then flows into the upper part of the impeller from the second water inlet on the impeller and is discharged from the third water inlet on the guide vane to reach the previous impeller assembly, and after the water flows in the first-stage, the water is discharged from the water outlet end of the pump shell by the valve seat.

The utility model discloses further set up to: the outer diameter of impeller is less than the outer diameter of impeller seat, the lateral wall of impeller has along its circumference direction and a plurality of first impeller blade of evenly distributed, the lateral wall of first impeller blade is the arc surface, and this arc surface apart from the perpendicular distance of impeller seat lateral wall is along circumference direction crescent or dwindle gradually, the lateral wall of impeller, the lateral wall of first impeller blade and clearance between the inner wall of stator forms the second water inlet.

Through adopting above-mentioned technical scheme, the impeller is rotating the swirl that the in-process produced through first impeller blade, extracts water, and first impeller blade sets up on the lateral wall of impeller, can increase the scope of swirl to make impeller assembly's single-stage lift higher.

The utility model discloses further set up to: the impeller is provided with a plurality of second impeller blades which are spiral and evenly distributed at one end opposite to the impeller seat, the number of the second impeller blades is the same as that of the first impeller blades, the spiral direction of the second impeller blades is consistent with that of the first impeller blades, one end of each second impeller blade is respectively led to the side end part of each first impeller blade, the outer side wall of the bottom part of each first impeller blade covered by each second impeller blade is respectively positioned on the same arc surface with the side wall of each first impeller blade, and the other end of each second impeller blade is abutted to the opening of the impeller.

By adopting the technical scheme, the lower end surface of the impeller is provided with the second impeller blade which is consistent with the spiral direction of the first impeller blade, and in the rotating process of the impeller, the first impeller blade and the second impeller blade rotate simultaneously and are superposed to further improve the speed and the diameter of a flowing vortex, so that the single-stage lift of the impeller component is improved, and the lift of the whole submersible pump is increased; the middle end part of the second impeller blade is arranged at the side end part of the first impeller blade, and the other end of the second impeller blade is arranged on the opening close to the impeller, so that the utilization rate of the second impeller blade is improved, and the diameter of the vortex is increased.

The utility model discloses further set up to: the second impeller blade is provided with a wear-resistant strip which is arranged along the length direction of the second impeller blade and is abutted against the impeller, and the width of the wear-resistant strip is smaller than that of the second impeller blade.

Through adopting above-mentioned technical scheme, set up wear strip on second impeller blade to improve the wearability of second impeller blade on the impeller seat, and then prolong second impeller blade's life.

The utility model discloses further set up to: the inner wall of the lower end of the guide vane cavity is provided with a circular groove which is radially and outwards opened, an annular guide vane bottom plate is embedded in the circular groove, a circular hole in the middle of the guide vane bottom plate is used for the transmission shaft to pass through and is not in contact with the transmission shaft, the lower end of the impeller seat is provided with a support ring, and the support ring is abutted against the guide vane bottom plate; the upper end outer wall of stator has the radial inward ring channel of seting up, and is adjacent behind the impeller subassembly block, the top the outer wall of following of stator circular recess supports tightly in the below the inner wall of stator ring channel, and the top the stator bottom plate supports tightly in the below the upper end of stator, circular recess has been seted up to the up end of stator, be provided with a plurality of heliciform and evenly distributed's stator blade in the circular recess, stator blade's spiral direction with first impeller blade's spiral direction is the same, stator blade wherein one end accesss to the inner wall of circular recess, and the other end near in the opening of stator, circular tank bottom portion has still been seted up and has been located adjacently between the stator blade and accesss to the fourth water inlet of stator cavity.

Through adopting above-mentioned technical scheme, for improving impeller assembly job stabilization nature, be provided with the stator bottom plate at the lower extreme of stator for this reason, be provided with the ring channel in the upper end outer fringe department of stator, support impeller seat and stator through the stator bottom plate, the mounting means is: the guide vane bottom plate is fixed at the water inlet port of the pump shell, an impeller seat is placed on the guide vane bottom plate, an impeller is placed on the impeller seat, the guide vane is sleeved in the guide vane, the guide vane is clamped on the guide vane bottom plate through a circular groove at the lower end of the guide vane, the first impeller assembly is installed at the moment, then the second impeller assembly is superposed on the first impeller assembly in the same mode, the lower end face of the guide vane on the second impeller assembly is tightly attached to the bottom of the circular groove of the guide vane on the first impeller assembly, and the upper end face and the upper end side face of the guide vane on the second impeller assembly are tightly attached to the guide vane bottom plate and the inner wall of the circular groove of the guide. The guide vanes, the guide vane bottom plate, the impeller seat and the impellers on the plurality of groups of impeller assemblies are clamped in sequence, so that the running stability of the plurality of groups of impeller assemblies is improved; the upper end of the guide vane is provided with a guide vane blade and a fourth water inlet so as to improve the water inflow.

The utility model discloses further set up to: the motor comprises a motor shell, a base, an oil bag, a lower bearing seat, a stator assembly, a rotor assembly and an upper bearing seat, wherein the stator assembly is arranged on the inner wall of the motor shell, the upper end of the rotor assembly is arranged on the upper bearing seat after penetrating through the stator assembly, the lower end of the rotor assembly is arranged on the lower bearing seat, the upper end of the rotor assembly is connected with the transmission shaft through a coupler after penetrating through the upper bearing seat, the lower bearing seat is arranged on the base, the oil bag is arranged between the base and the lower bearing seat, the lower bearing seat and the upper bearing seat are both sleeved with connecting snap springs, and the motor shell is arranged between the upper bearing seat and the lower bearing seat through the connecting snap springs;

the motor is a vertical single-phase or three-phase squirrel-cage asynchronous motor.

By adopting the technical scheme, the upper end part of the rotor assembly is connected with the transmission shaft through the coupler so as to be convenient to mount and dismount; set up the connection jump ring on step and bolster bearing housing to improve the installation intensity of motor casing installation on step and bolster bearing housing, avoid appearing becoming flexible.

The utility model discloses further set up to: the utility model discloses a pump case, including pump case, bolster bearing housing, baffle, bolster bearing housing, pump case, bolster bearing housing, the end of intaking of pump case is provided with the protection casing on the wall outward, the protection casing includes the baffle that sets up from top to bottom and is used for connecting the splice bar of two baffles, the splice bar have a plurality ofly and evenly distributed in the outer fringe department of baffle, bolster bearing housing sets up in the below on the baffle, the protection casing still includes along the cladding of circumferential direction in two metal mesh enclosure on the baffle, just the inner wall of metal mesh enclosure is contradicted.

Through adopting above-mentioned technical scheme, set up the protection casing in order to prevent that the immersible pump from at the during operation, with the great foul (pasture and water etc.) of aquatic inhale the pump case in, can filter water through the metal screen panel, the baffle of protection casing top is used for supporting stator and the stator bottom plate on the impeller subassembly of below.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic view of the internal structure of the present invention;

fig. 3 is a schematic diagram of an exploded structure of the impeller assembly of the present invention;

fig. 4 is a schematic view of the internal structure of the stacked two impeller assemblies of the present invention;

fig. 5 is a schematic structural view of the guide vane of the present invention;

fig. 6 is a schematic structural view of the impeller of the present invention;

fig. 7 is a schematic structural view of the protective cover of the present invention;

FIG. 8 is a cross-sectional view taken at A-A of FIG. 7;

the reference numbers in the figures are: 1. a motor; 11. a motor housing; 12. a base; 13. an oil pocket; 14. a lower bearing seat; 15. a stator assembly; 16. a rotor assembly; 17. an upper bearing seat; 18. a coupling; 2. a pump body; 21. a pump housing; 211. a water inlet end; 212. a water outlet end; 22. an impeller assembly; 221. a guide vane; 2211. a circular groove; 2212. an annular groove; 2213. a circular groove; 2214. a guide vane blade; 222. an impeller seat; 2221. a support ring; 223. an impeller; 2231. a shaft sleeve; 2232. a first impeller blade; 2233. a second impeller blade; 2234. wear resistant strips; 224. a guide vane bottom plate; 225. a first water inlet; 226. a second water inlet; 227. a third water inlet; 228. a fourth water inlet; 23. a valve seat; 24. a drive shaft; 3. a protective cover; 31. a baffle plate; 32. connecting ribs; 33. a metal mesh enclosure.

Detailed Description

In order to make the technical solutions in the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings:

as shown in fig. 1 and 2, a single-stage high-lift submersible pump comprises a motor 1 and a pump body 2 connected to the motor 1;

the motor 1 is a vertical single-phase or three-phase squirrel-cage asynchronous motor, the motor 1 comprises a motor shell 11, a base 12, an oil bag 13, a lower bearing seat 14, a stator assembly 15, a rotor assembly 16 and an upper bearing seat 17, the stator assembly 15 is arranged on the inner wall of the motor shell 11, the upper end of the rotor assembly 16 penetrates through the stator assembly 15 and is arranged on the upper bearing seat 17, the lower end of the rotor assembly is arranged on the lower bearing seat 14, the lower bearing seat 14 is arranged on the base 12, the oil bag 13 is arranged between the base 12 and the lower bearing seat 14, a connecting snap spring is sleeved on each of the lower bearing seat 14 and the upper bearing seat 17, and the motor shell 11 is arranged between the upper bearing seat 17 and.

The lower bearing seat 14 and the upper bearing seat 17 are provided with connecting clamp springs to improve the installation strength of the motor shell 11 on the lower bearing seat 14 and the upper bearing seat 17 and avoid looseness.

The pump body 2 comprises a pump shell 21, and a plurality of groups of impeller assemblies 22 and valve seats 23 which are arranged in the pump shell 21, wherein the lower end of the pump shell 21 is a water inlet end 211, the upper end of the pump shell 21 is a water outlet end 212, and a transmission shaft 24 which is arranged along the length direction of the pump shell 21 and is respectively communicated with the water inlet end 211 and the water outlet end 212 is arranged in the pump shell 21; the multiple groups of impeller assemblies 22 are sequentially arranged on the transmission shaft 24 along the length direction of the transmission shaft 24, the valve seat 23 is arranged at the upper end part of the transmission shaft 24, and the upper end of the rotor assembly 16 of the motor 1 penetrates through the upper bearing seat 17 and then is connected with the transmission shaft 24 through the coupler 18 so as to drive the multiple groups of impeller assemblies 22 to rotate;

as shown in fig. 3, 4, 5 and 6, the impeller assembly 22 includes a guide vane 221 having a cavity at a lower end, and an impeller seat 222 and an impeller 223 located in the cavity of the guide vane 221, the impeller 223 is disposed at an upper end of the impeller seat 222, openings are disposed on the impeller seat 222, the impeller 223 and the guide vane 221 in a penetrating manner, a shaft sleeve 2231 sleeved on the transmission shaft 24 is disposed on the opening of the impeller 223, two ends of the shaft sleeve 2231 respectively lead to the opening of the impeller seat 222 and the opening of the guide vane 221, a first water inlet 225 is formed by a gap between the opening of the impeller seat 222 and the shaft sleeve 2231, a third water inlet 227 is formed by a gap between the opening of the guide vane 221 and the shaft sleeve 2231, and a second water inlet 226 communicating the impeller seat 222 and the third water inlet 227 of the guide vane 221 is further disposed.

The impeller assembly 22 mainly comprises a guide vane 221, an impeller seat 222 and an impeller 223, wherein the impeller seat 222 supports the impeller 223, and the guide vane 221 provides a sealed environment for the impeller 223; the drive shaft 24 is driven by the motor 1 to rotate, so as to drive the impeller 223 on the impeller assembly 22 to rotate, in the process, water flows into the pump housing 21 from the water inlet end 211 below the pump housing 21, then enters between the impeller 223 and the impeller seat 222 from the first water inlet 225, then flows into the upper part of the impeller 223 from the second water inlet 226 on the impeller 223 and is discharged from the third water inlet 227 on the guide vane 221 to the previous impeller assembly 22, and after the water flows in the first stage, the water is finally discharged from the water outlet end 212 of the pump housing 21 by the valve seat 23.

The outer diameter of the impeller 223 is smaller than that of the impeller seat 222, the side wall of the impeller 223 has a plurality of first impeller blades 2232 uniformly distributed along the circumferential direction thereof, the side wall of the first impeller blade 2232 is a circular arc surface, the vertical distance between the circular arc surface and the side wall of the impeller seat 222 gradually increases or gradually decreases along the circumferential direction, and a gap between the side wall of the impeller 223, the side wall of the first impeller blade 2232 and the inner wall of the guide vane 221 forms the second water inlet 226.

The impeller 223 draws water through the swirl that first impeller blade 2232 produced at the rotation in-process, and first impeller blade 2232 sets up on the lateral wall of impeller 223, can increase the scope of swirl to make the single-stage lift of impeller subassembly 22 higher.

The impeller 223 has a plurality of second impeller blades 2233 which are spirally and uniformly distributed at an end opposite to the impeller seat 222, the number of the second impeller blades 2233 is the same as that of the first impeller blades 2232, the spiral direction of the second impeller blades 2233 is the same as that of the first impeller blades 2232, one end of each second impeller blade 2233 is respectively opened to the side end of each first impeller blade 2232, the outer side wall of each second impeller blade 2233 covering the bottom portion of each first impeller blade 2232 is respectively on the same arc surface with the side wall of each first impeller blade 2232, and the other end of each second impeller blade 2233 is abutted to the opening of the impeller.

The second impeller blades 2233 whose spiral direction is consistent with that of the first impeller blades 2232 are arranged on the lower end surface of the impeller 223, and in the rotating process of the impeller 223, the first impeller blades 2232 and the second impeller blades 2233 rotate simultaneously, and the overlapping of the first impeller blades 2232 and the second impeller blades 2233 can further improve the speed and the diameter of a flowing vortex, so that the single-stage lift of the impeller component 22 is improved, and the lift of the whole submersible pump is increased; the second impeller blades 2233 are provided at the side end of the first impeller blades 2232 at the other end thereof, which is close to the opening of the impeller 223, to improve the utilization of the second impeller blades 2233 and increase the diameter of the vortex.

The second impeller blade 2233 has a wear strip 2234 arranged along the length direction and abutting against the impeller, and the width of the wear strip 2234 is smaller than the width of the impeller 223 blade. The wear-resistant strips 2234 are provided on the second impeller blade 2233 to improve the wear resistance of the second impeller blade 2233 on the impeller seat 222, thereby prolonging the service life of the second impeller blade 2233.

A circular groove 2211 which is radially and outwards formed in the inner wall of the lower end of the cavity of the guide vane 221, an annular guide vane bottom plate 224 is embedded in the circular groove 2211, a circular hole in the middle of the guide vane bottom plate 224 is used for a transmission shaft 24 to penetrate through and is not in contact with the transmission shaft 24, a support ring 2221 is arranged at the lower end of the impeller seat 222, and the support ring 2221 is abutted against the guide vane bottom plate 224; the outer wall of the upper end of the guide vane 221 has a radial inward-opened annular groove 2212, after the adjacent impeller assemblies 22 are clamped, the outer wall of the upper guide vane circular groove 2211 abuts against the inner wall of the annular groove 2212 of the lower guide vane, and the upper guide vane bottom plate 224 abuts against the upper end of the lower guide vane 221, the upper end face of the guide vane 221 is provided with a circular groove 2213, a plurality of guide vane blades 2214 which are spirally and uniformly distributed are arranged in the circular groove 2213, the spiral direction of the guide vane blades 2214 is the same as that of the first impeller blade 2232, one end of each guide vane blade 2214 leads to the inner wall of the circular groove 2213, the other end of each guide vane blade 2214 abuts against the opening of the guide vane 221, and the bottom of the circular groove 2211 is further provided with a fourth water inlet 228 which is located between.

In order to improve the working stability of the impeller assembly 22, a guide vane bottom plate 224 is arranged at the lower end of the guide vane 221, an annular groove 2212 is arranged at the outer edge of the upper end of the guide vane 221, and the impeller seat 222 and the guide vane are supported by the guide vane bottom plate 224;

the installation mode is as follows: the guide vane bottom plate 224 is fixed at the water inlet end 211 of the pump shell 21, the guide vane base plate 224 is provided with the impeller seat 222, the impeller is arranged on the impeller seat 222, and the guide vane 221 is sleeved into the guide vane 221, the guide vane 221 is clamped on the guide vane bottom plate 224 through the circular groove 2211 at the lower end of the guide vane 221, at this time, the first impeller assembly 22 is installed completely, then the second impeller assembly 22 is superposed on the first impeller assembly 22 in the same way, at this time, the lower end surface of the guide vane on the second impeller assembly 22 is tightly attached to the bottom of the circular groove 2212 of the guide vane 221 on the first impeller assembly 22, and the upper end surface and the upper end side surface of the guide vane 221 on the second impeller assembly 22 are tightly attached to the guide vane bottom plate 224 and the inner wall of the. The guide vanes 221, the guide vane bottom plate 224, the impeller seat 222 and the impeller 223 on the multiple groups of impeller assemblies 22 are clamped in sequence, so that the running stability of the multiple groups of impeller assemblies 22 is improved;

a guide vane blade 2214 and a fourth water inlet 228 are arranged at the upper end of the guide vane 221 to improve the water inflow.

As shown in fig. 1, 7 and 8, the submersible pump further comprises a protective cover 3 arranged on the outer edge wall of the water inlet end 211 of the pump shell 21, the protective cover 3 comprises a baffle 31 arranged up and down and a connecting rib 32 used for connecting the two baffles 31, the connecting rib 32 is provided with a plurality of and evenly distributed at the outer edge of the baffle 31, the upper bearing seat 17 is arranged on the baffle 31 below, the protective cover 3 further comprises a metal mesh enclosure 33 coated on the two baffles 31 along the circumferential direction, and the inner wall of the metal mesh enclosure 33 is abutted on the connecting ribs 32.

The protective cover 3 is arranged to prevent the submersible pump from sucking large dirt (aquatic weeds and the like) in water into the pump shell 21 when the submersible pump works, the water can be filtered through the metal mesh 33, and the baffle 31 above the protective cover 3 is used for supporting the guide vanes on the lowermost impeller assembly 22 and the guide vane bottom plate 224.

The above embodiments are only preferred embodiments of the present invention, not all embodiments, and other embodiments obtained based on the above embodiments by those skilled in the art without any creative work shall fall within the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a single-stage high-lift immersible pump, includes motor (1) and the pump body (2), its characterized in that: the pump body (2) comprises a pump shell (21) and a plurality of groups of impeller assemblies (22) and valve seats (23) which are arranged in the pump shell (21), the lower end of the pump shell (21) is a water inlet end (211), the upper end of the pump shell (21) is a water outlet end (212), the pump shell (21) is internally provided with a transmission shaft (24) which is arranged along the length direction of the pump shell and the two ends of which are respectively communicated with the water inlet end (211) and the water outlet end (212), the plurality of groups of impeller assemblies (22) are sequentially arranged on the transmission shaft (24) along the length direction of the transmission shaft (24), the valve seats (23) are arranged at the upper end part of the transmission shaft (24), and the output end of the motor (1) is connected to the transmission shaft (24) and used for driving the plurality of;

impeller subassembly (22) including the guide vane (221) that the cavity was seted up to the lower extreme and be located guide vane (221) impeller seat (222) and impeller (223) in the cavity, impeller (223) set up in the upper end of impeller seat (222), impeller (223) and guide vane (221) are last to have the opening that runs through the setting, be provided with on the opening of impeller (223) and locate shaft sleeve (2231) of transmission shaft (24), the both ends of shaft sleeve (2231) lead to respectively the opening of impeller seat (222) and the opening of guide vane (221), opening on impeller seat (222) with the clearance between shaft sleeve (2231) forms first water inlet (225), opening on guide vane (221) with the clearance between shaft sleeve (2231) forms third inlet (227), still be provided with on impeller (223) with impeller seat (222) with third inlet (227) on guide vane (221) link to each other A second water inlet (226) which is open.

2. The single stage high head submersible pump of claim 1, wherein: the outer diameter of the impeller (223) is smaller than the outer diameter of the impeller seat (222), the side wall of the impeller (223) is provided with a plurality of first impeller blades (2232) which are uniformly distributed along the circumferential direction of the impeller, the side wall of each first impeller blade (2232) is an arc surface, the distance between the arc surface and the side wall of the impeller seat (222) is gradually increased or reduced along the circumferential direction, and the gaps among the side wall of the impeller (223), the side wall of each first impeller blade (2232) and the inner wall of each guide vane (221) form the second water inlet (226).

3. The single stage high head submersible pump of claim 2, wherein: the impeller (223) has a plurality of second impeller blades (2233) which are spirally and uniformly distributed at one end of the impeller seat (222), the number of the second impeller blades (2233) is the same as that of the first impeller blades (2232), the spiral direction of the second impeller blades (2233) is the same as that of the first impeller blades (2232), one end of each second impeller blade (2233) is respectively opened to the side end of each first impeller blade (2232), the outer side wall of the bottom part of each first impeller blade (2232) covered by each second impeller blade (2233) is respectively on the same arc surface with the side wall of each first impeller blade (2232), and the other end of each second impeller blade (2233) is close to the opening of the impeller (223).

4. A single stage high head submersible pump according to claim 3, wherein: the second impeller blade (2233) is provided with a wear-resistant strip (2234) which is arranged along the length direction and is abutted against the impeller (223), and the width of the wear-resistant strip (2234) is smaller than that of the second impeller blade (2233).

5. The single stage high head submersible pump of claim 2, wherein: the inner wall of the lower end of the cavity of the guide vane (221) is provided with a circular groove (2211) which is radially and outwards opened, an annular guide vane bottom plate (224) is embedded in the circular groove (2211), a circular hole in the middle of the guide vane bottom plate (224) is used for the transmission shaft (24) to penetrate, the transmission shaft and the guide vane bottom plate are not in contact, the lower end of the impeller seat (222) is provided with a support ring (2221), and the support ring (2221) is abutted to the guide vane bottom plate (224); the upper end outer wall of stator vane (221) has radial inside ring channel (2212) of seting up, and is adjacent impeller subassembly (22) block back, top the outer wall of following of stator vane (221) circular groove (2211) supports tightly in the below the inner wall of stator vane (221) ring channel (2212), and the top stator vane bottom plate (224) supports tightly in the below the upper end of stator vane (221), circular recess (2213) have been seted up to the upper end face of stator vane (221), be provided with a plurality of stator vane (2214) that are heliciform and evenly distributed in circular recess (2213), the spiral direction of stator vane (2214) with the spiral direction of first impeller vane (2232) is the same, stator vane (2214) wherein one end accesss to the inner wall of circular recess (2213), and the other end is close to the opening of stator vane (221), circular groove (2211) bottom has still been seted up and has been located adjacently between stator vane (2214) and accesss to stator vane (221) cavity (2212) is adjacent And a fourth water inlet (228).

6. The single stage high head submersible pump of claim 1, wherein: the motor (1) comprises a motor shell (11), a base (12), an oil bag (13), a lower bearing seat (14), a stator assembly (15), a rotor assembly (16) and an upper bearing seat (17), wherein the stator assembly (15) is arranged on the inner wall of the motor shell (11), the rotor assembly (16) penetrates through the upper end of the stator assembly (15) and is arranged on the upper bearing seat (17), the lower end of the rotor assembly is arranged on the lower bearing seat (14), the upper end of the rotor assembly (16) penetrates through the upper bearing seat (17) and is connected with a transmission shaft (24) through a shaft coupling (18), the lower bearing seat (14) is arranged on the base (12), the oil bag (13) is arranged between the base (12) and the lower bearing seat (14), and the upper bearing seat (17) are both sleeved with a connecting clamp spring, the motor shell (11) is installed between the upper bearing seat (17) and the lower bearing seat (14) through the connecting clamp spring.

7. The single stage high head submersible pump of claim 6, wherein: the utility model discloses a pump case, including pump case (21), intake end (211) of pump case (21) is provided with protection casing (3) on the wall outward along, protection casing (3) are including baffle (31) that set up from top to bottom and be used for connecting splice bar (32) of two baffles (31), splice bar (32) have a plurality ofly and evenly distributed in the outer fringe department of baffle (31), bolster bearing housing (17) set up in the below on baffle (31), protection casing (3) still include along the circumference direction cladding in two metal screen panel (33) of cavity between baffle (31), just the inner wall of metal screen panel (33) is contradicted in a plurality of on splice bar (32).

8. A single stage high head submersible pump according to any one of claims 1 to 7, wherein: the motor (1) is a vertical single-phase or three-phase squirrel-cage asynchronous motor.

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