Long shaft submersible pump

Abstract

The application discloses a long-shaft submersible pump and belongs to the technical field of submersible pumps.The long-shaft submersible pump comprises a shell, a double-shaft driving assembly is rotationally connected in the shell, the double-shaft driving assembly comprises coaxially arranged first and second driving shafts, the first driving shaft is connected with a rotary driving assembly, the first driving shaft is fixedly connected with a first impeller, a first inner spline is fixedly connected to the inner wall of the first driving shaft, the second driving shaft comprises an upper shaft and a lower shaft, the upper shaft penetrates through the first driving shaft and is slidably connected with the first driving shaft, a second protruding ring, a first outer spline and a second outer spline are fixedly connected to the outer wall of the upper shaft, the second protruding ring is connected with a lifting driving assembly, the lower shaft is rotationally connected in the shell, a second impeller is fixedly connected to the outer wall of the lower shaft, and a second inner spline is fixedly connected to the inner wall of the lower shaft.The long-shaft submersible pump has the above-mentioned structure, the lift of the submersible pump can be adjusted without disassembling the submersible pump, and the adjustment is convenient and fast.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of submersible pumps, and particularly relates to a long-shaft submersible pump. BACKGROUND

[0002] The submersible pump is a positive pressure delivery vertical pump, which can effectively solve the problems of air resistance and cavitation. At present, the submersible pump is often used by the operator when the liquid is delivered, and the existing submersible pump adopts the pump body and impeller of a single-stage centrifugal pump as the hydraulic components of the pump. However, the structure design has the defects that the lift is generally not too high and is not easy to adjust. The Chinese patent with the application number CN202022523868.3 provides a long-shaft submersible pump, which comprises a water inlet section component. The water inlet section component is fixedly connected with a first flow guide component through bolts. The first flow guide component is fixedly connected with a second flow guide component through bolts. The second flow guide component is fixedly connected with a lower connecting pipe through bolts. The top of the lower connecting pipe is movably connected with a first connecting disc. The top of the first connecting disc is movably connected with a middle connecting pipe. The lower connecting pipe, the first connecting disc and the middle connecting pipe are fixedly connected through bolts. The top of the middle connecting pipe is movably connected with a second connecting disc. The top of the second connecting disc is movably connected with an upper connecting pipe. The middle connecting pipe, the second connecting disc and the upper connecting pipe are fixedly connected through bolts. The top of the upper connecting pipe is fixedly connected with a water outlet section through bolts. The top of the water outlet section is fixedly connected with a motor support through bolts. The middle of the top end of the water outlet section is fixedly connected with a mechanical seal cover through bolts. The inside of the first connecting disc movably sleeves a lower shaft. The top end of the lower shaft is located in the inside of the middle connecting pipe. The bottom end of the lower shaft sequentially passes through the lower connecting pipe, the second flow guide component, the first flow guide component and the water inlet section component and extends into the inside of the water inlet section component and movably sleeves the bottom of the inner cavity of the water inlet section component. The outer surface of the lower shaft fixedly sleeves a first impeller located in the inside of the first flow guide component. The outer surface of the lower shaft fixedly sleeves a second impeller located in the inside of the second flow guide component. The first impeller and the second impeller are tightly sleeved on the outer surface of the lower shaft by expansion and contraction, and the first impeller and the second impeller have detachable performance.

[0003] When the operator uses the above structure, the first impeller and the second impeller can be detached and the size of the first impeller and the second impeller can be changed to adjust the flow of the water pump. Meanwhile, the number of stages of the impeller can be increased or decreased to change the lift of the water pump, so as to meet the needs of users for different lifts and increase the practicability of the submersible pump. However, the above structure has the following problems when used: the submersible pump needs to be detached after shutdown, and then the first impeller needs to be installed or detached to adjust the lift of the submersible pump, and the adjustment process is complex.

[0004] To solve the above problems, a new type of submersible pump needs to be provided. SUMMARY

[0005] The long-shaft submersible pump of the present application can adjust the lift of the submersible pump without disassembling the submersible pump, which is convenient and fast.

[0006] To achieve the above object, the present application provides a long-shaft submersible pump, which comprises a shell, a first pump shell and a second pump shell fixedly connected to the bottom of the shell in an up-down arrangement, a double-shaft driving assembly rotatably connected in the shell, the double-shaft driving assembly comprising a first driving shaft and a second driving shaft coaxially arranged, the first driving shaft being connected with a rotary driving assembly and fixedly connected with a first impeller in the first pump shell, a first inner spline fixedly connected to the inner wall of the first driving shaft, the second driving shaft comprising an upper shaft and a lower shaft arranged in an up-down arrangement, the upper shaft penetrating through the first driving shaft and being in sliding connection with the first driving shaft, an outer wall of the upper shaft being fixedly connected with a second protruding ring, a first outer spline and a second outer spline arranged in sequence from top to bottom, the second protruding ring being connected with a lifting driving assembly, the first outer spline being structurally matched with the first inner spline, the lower shaft being rotatably connected in the shell, an outer wall of the lower shaft being fixedly connected with a second impeller in the second pump shell, and an inner wall of the lower shaft being fixedly connected with a second inner spline structurally matched with the second outer spline.

[0007] Preferably, the rotary driving assembly comprises a mounting table, a rotary driving motor, a driving gear, a driven gear, a first protruding ring and a first annular boss, the mounting table being fixedly connected with the outer side wall of the shell, the rotary driving motor being fixedly connected on the mounting table, an output shaft of the rotary driving motor being coaxially fixedly connected with the driving gear, the driven gear and the first protruding ring being coaxially fixedly connected on the outer side wall of the first driving shaft, the driven gear being in meshing connection with the driving gear, the first protruding ring being overlapped on the first annular boss, and the first annular boss being fixed on the inner wall of the shell.

[0008] Preferably, the shell, the first driving shaft and the upper shaft all comprise an upper segment, a middle segment and a lower segment which are detachably connected in sequence from top to bottom, the height of the middle segment of the shell is not higher than the height of the middle segment of the first driving shaft, the height of the middle segment of the first driving shaft is not higher than the height of the middle segment of the upper shaft, the first pump shell and the second pump shell are fixedly connected on the lower segment of the shell, and the first impeller is fixedly connected on the lower segment of the first driving shaft.

[0009] Preferably, the lifting driving assembly comprises a lifting support fixedly connected to the mounting table, a lifting driving motor fixedly connected to the top surface of the top plate of the lifting support, a threaded rod rotatably connected to the bottom surface of the top plate of the lifting support, guide rods fixedly connected to the lifting support and symmetrically arranged on the two sides of the threaded rod, an output shaft of the lifting driving motor fixedly connected to the top end of the threaded rod, a nut seat on the threaded rod fixedly connected to the lifting disc, a guide hole on the lifting disc adaptedly connected to the guide rods, and two support bases detachably connected to the bottom surface of the lifting disc and symmetrically arranged on the two sides of the second protruding ring.

[0010] Preferably, the top end of the upper shaft is fixedly connected with a magnetic metal block, the bottom end of the threaded rod is provided with a gap slot adapted to the structure of the upper shaft, and the slot bottom of the gap slot is fixedly connected with a magnet block.

[0011] Preferably, the top surface of the lower shaft is provided with a socket groove adapted to the structure of the upper shaft, the inner wall of the socket groove is provided with the second inner spline, the bottom end of the upper shaft is in contact with the slot bottom of the socket groove, the first outer spline is connected with the first inner spline, and the second outer spline is connected with the second inner spline.

[0012] Preferably, the outer wall of the lower shaft is fixedly connected with a third protruding ring lapping on the second annular boss on the inner wall of the shell.

[0013] Preferably, the outlet of the second pump shell is connected with the inlet of the first pump shell through a connecting pipe, and the outlet of the first pump shell is connected with a liquid outlet pipe.

[0014] Preferably, a filter screen is detachably connected to the inlet of the second pump shell.

[0015] Therefore, the long-shaft submersible pump with the above structure has the following beneficial effects: the lifting of the upper shaft in the double-shaft driving assembly is used to switch the first impeller single rotation mode and the first impeller and second impeller common rotation mode, thereby achieving the purpose of adjusting the lift of the submersible pump, and the lift of the submersible pump can be adjusted without disassembling the submersible pump, which is convenient and fast.

[0016] The technical solutions of the present application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the long-shaft submersible pump of the present application;

[0018] Figure 2It is a structure schematic view of an embodiment of a double-shaft driving assembly in a long-shaft submersible pump according to the present application.

[0019] Figure 3 It is a structure schematic view of an embodiment of a first driving shaft in a long-shaft submersible pump according to the present application.

[0020] Figure 4 It is a structure schematic view of an embodiment of an upper shaft in a long-shaft submersible pump according to the present application.

[0021] Figure 5 It is a structure schematic view of an embodiment of a lower shaft in a long-shaft submersible pump according to the present application.

[0022] Figure 6 It is a structure schematic view of an embodiment of a lifting driving assembly in a long-shaft submersible pump according to the present application.

[0023] In the figure: 1, housing; 2, first pump shell; 3, second pump shell; 4, first driving shaft; 5, second driving shaft; 51, upper shaft; 52, lower shaft; 61, mounting table; 62, rotary driving motor; 63, driving gear; 64, driven gear; 65, first collar; 7, first impeller; 8, second collar; 9, first external spline; 10, second external spline; 11, lifting driving assembly; 111, lifting support; 112, lifting driving motor; 113, threaded rod; 114, guide rod; 115, lifting disc; 116, support seat; 117, bearing groove; 12, second impeller; 13, second internal spline; 14, flange; 15, magnetic metal block; 16, third collar; 17, liquid outlet pipe; 18, filter screen; 19, connecting pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments. EMBODIMENT

[0026] REFERENCE Figures 1-6As shown, the embodiment provides a long shaft submersible pump, which comprises a shell 1, the bottom of the shell 1 is fixedly connected with a first pump shell 2 and a second pump shell 3 arranged in sequence. A double-shaft driving assembly is rotationally connected in the shell 1, the double-shaft driving assembly comprises a first driving shaft 4 and a second driving shaft 5 arranged on the same axis. The first driving shaft 4 is connected with a rotary driving assembly, and the first driving shaft 4 is fixedly connected with a first impeller 7 located in the first pump shell 2. A first inner spline is fixedly connected on the inner wall of the first driving shaft 4. The rotary driving assembly is used to drive the first driving shaft 4 to rotate and in turn drive the first impeller 7 to rotate.

[0027] The second driving shaft 5 comprises an upper shaft 51 and a lower shaft 52 arranged in sequence, the upper shaft 51 penetrates through the first driving shaft 4 and is slidably connected with the first driving shaft 4. A second protruding ring 8, a first outer spline 9 and a second outer spline 10 are fixedly connected on the outer wall of the upper shaft 51 in sequence from top to bottom, and the second protruding ring 8 is connected with a lifting driving assembly 11. The lifting driving assembly 11 is used to drive the second protruding ring 8 to lift and in turn realize the lifting of the whole upper shaft 51. The first outer spline 9 is matched with the structure of the first inner spline. After the upper shaft 51 is lowered, the first outer spline 9 is connected with the first inner spline, so that the first driving shaft 4 can drive the upper shaft 51 to rotate. The lower shaft 52 is rotationally connected in the shell 1, a second impeller 12 located in the second pump shell 3 is fixedly connected on the outer wall of the lower shaft 52, and a second inner spline 13 matched with the structure of the second outer spline 10 is fixedly connected on the inner wall of the lower shaft 52. After the upper shaft 51 is lowered, the second outer spline 10 is connected with the second inner spline 13, so that the upper shaft 51 can drive the lower shaft 52 to rotate.

[0028] In use, the rotary driving assembly drives the first driving shaft 4 to rotate and in turn drives the first impeller 7 to rotate, and the first impeller 7 provides power for the pumping of liquid. When it is needed to increase the lift of the submersible pump, the lifting driving assembly 11 is started, the lifting power device drives the second protruding ring 8 to descend and in turn realizes the descent of the whole upper shaft 51. After the upper shaft 51 is lowered, the first outer spline 9 is connected with the first inner spline, and the second outer spline 10 is connected with the second inner spline 13. The connection of the first outer spline 9 with the first inner spline enables the first driving shaft 4 to drive the upper shaft 51 to rotate, and the connection of the second outer spline 10 with the second inner spline 13 enables the upper shaft 51 to drive the lower shaft 52 to rotate, thereby realizing the common rotation of the first impeller 7 and the second impeller 12 and increasing the lift of the submersible pump. When it is needed to restore the lift of the submersible pump, the lifting driving assembly 11 is started, the lifting power device drives the second protruding ring 8 to ascend and in turn realizes the ascent of the whole upper shaft 51. After the upper shaft 51 is ascended, the first outer spline 9 is separated from the first inner spline, and the second outer spline 10 is separated from the second inner spline 13. At this time, the second impeller 12 does not rotate, and only the first impeller 7 rotates to provide power for the conveying of liquid.

[0029] Further preferably, the rotating driving assembly comprises a mounting table 61, a rotating driving motor 62, a driving gear 63, a driven gear 64, a first collar 65 and a first annular boss, the mounting table 61 is fixedly connected with the outer side wall of the shell 1, the rotating driving motor 62 is fixedly connected on the mounting table 61, the output shaft of the rotating driving motor 62 is fixedly connected with the driving gear 63 coaxially, the driven gear 64 and the first collar 65 are both fixedly connected on the outer side wall of the first driving shaft 4 coaxially, the driven gear 64 is meshingly connected with the driving gear 63, and the first collar 65 is overlapped on the first annular boss, which is fixed on the inner wall of the shell 1.

[0030] In use, the cooperation of the first collar 65 and the first annular boss realizes the rotating connection of the first driving shaft 4 in the shell 1, after the rotating driving motor 62 is started, the rotating driving motor 62 drives the driving gear 63 to rotate, the driving gear 63 drives the driven gear 64 to rotate, and the first driving shaft 4 is rotated, thereby driving the first impeller 7 to rotate and providing power for the pumping of the liquid.

[0031] Further preferably, the shell 1, the first driving shaft 4 and the upper shaft 51 all comprise an upper segment, a middle segment and a lower segment which are detachably connected from top to bottom, the height of the middle segment of the shell 1 is not higher than the height of the middle segment of the first driving shaft 4, the height of the middle segment of the first driving shaft 4 is not higher than the height of the middle segment of the upper shaft 51, the first pump shell 2 and the second pump shell 3 are fixedly connected on the lower segment of the shell 1, and the first impeller 7 is fixedly connected on the lower segment of the first driving shaft 4.

[0032] In use, the upper segment, the middle segment and the lower segment can be connected through the flange 14, the length of the submersible pump as a whole can be changed by replacing the middle segment with different lengths, so that the device can be used under different liquid levels, and the applicability is stronger.

[0033] Further preferably, the lifting driving assembly 11 comprises a lifting support 111 fixedly connected on the mounting table 61, and a lifting driving motor 112 fixedly connected on the top surface of the top plate of the lifting support 111. The bottom surface of the top plate of the lifting support 111 is rotationally connected with a threaded rod 113, and the two sides of the threaded rod 113 are symmetrically provided with guide rods 114 fixed on the lifting support 111. The top end of the threaded rod 113 is fixedly connected with the output shaft of the lifting driving motor 112, and the nut seat on the threaded rod 113 is fixedly connected with a lifting disc 115. The lifting disc 115 is provided with guide holes adaptedly connected with the guide rods 114, and the bottom surface of the lifting disc 115 is detachably connected with two support seats 116. The two support seats 116 are symmetrically provided on the two sides of the second collar 8, and the support seat 116 is provided with a supporting groove 117 slidably connected with the second collar 8. The cooperation of the supporting groove 117 and the second collar 8 enables the upper shaft 51 to rotate.

[0034] In use, the lifting driving motor 112 drives the threaded rod 113 to rotate, and the threaded rod 113 can drive the lifting disc 115 to move up and down along the guide rod 114 after rotating. Since the second lug 8 is connected with the supporting groove 117 on the lifting disc 115, the lifting disc 115 can drive the second lug 8 and the upper shaft 51 to move up and down. The lifting support 111 can be connected with the mounting table 61 through bolts, and the detachable connection of the supporting seat 116 and the lifting disc 115 facilitates the disassembly and maintenance of the upper shaft 51.

[0035] Further preferably, the top end of the upper shaft 51 is fixedly connected with a magnetic metal block 15, and the bottom end of the threaded rod 113 is provided with a clearance groove matched with the structure of the upper shaft 51. The groove bottom of the clearance groove is fixedly connected with a magnet block, and the magnet block is arranged opposite to the magnetic metal block 15.

[0036] In use, the cooperation of the magnetic metal block 15 and the magnet block can provide an upward force for the upper shaft 51 after the upper shaft 51 is lifted, thereby sharing the load on the supporting seat 116 and avoiding deformation of the supporting seat 116 after long-term use, thereby improving the service life of the entire lifting driving assembly 11.

[0037] Further preferably, the top surface of the lower shaft 52 is provided with a socket groove matched with the structure of the upper shaft 51, and the inner wall of the socket groove is provided with a second inner spline 13. After the bottom end of the upper shaft 51 contacts with the groove bottom of the socket groove, the first outer spline 9 is connected with the first inner spline, and the second outer spline 10 is connected with the second inner spline 13.

[0038] In use, the socket groove can provide support for the upper shaft 51 after the upper shaft 51 is lowered, thereby sharing the load on the supporting seat 116 and avoiding deformation of the supporting seat 116 after long-term use, thereby improving the service life of the entire lifting driving assembly 11.

[0039] Further preferably, the outer wall of the lower shaft 52 is fixedly connected with a third lug 16, and the third lug 16 is lapped on the second annular boss on the inner wall of the shell 1.

[0040] In use, the cooperation of the third lug 16 and the second annular boss enables the lower shaft 52 to rotate in the shell 1.

[0041] Further preferably, the outlet of the second pump shell 3 is connected with the inlet of the first pump shell 2 through a connecting pipe 19, and the outlet of the first pump shell 2 is connected with a liquid outlet pipe 17. The connecting pipe 19 is used to realize the series connection of the first pump shell 2 and the second pump shell 3, and the liquid outlet pipe 17 is used to realize the pumping of the liquid.

[0042] When in use, the outlet of the first pump shell 2 can be detachably connected with the liquid outlet pipe 17, so that the first pump shell 2 and the liquid outlet pipe 17 can be conveniently maintained and replaced. The top of the side wall of the liquid outlet pipe 17 can be fixedly connected with the mounting table 61, so that the stability of the liquid outlet pipe 17 is improved. The liquid outlet pipe 17 can be in a segmented mode, and the segments of the liquid outlet pipe 17 can be detachably connected, so that the length of the liquid outlet pipe 17 can be conveniently changed by replacing a segment of the liquid outlet pipe 17.

[0043] Further preferably, the inlet of the second pump shell 3 is detachably connected with a filter screen 18.

[0044] When in use, the filter screen 18 can filter impurities in the liquid, so that the liquid submersible pump is prevented from being blocked by the impurities.

[0045] Therefore, the long-shaft liquid submersible pump with the above structure can conveniently and quickly adjust the lift of the liquid submersible pump without disassembling the liquid submersible pump.

[0046] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A long shaft submersible pump characterized by: The utility model provides a kind of pump, including shell (1), the bottom of the shell (1) is fixedly connected with first pump shell (2) and second pump shell (3) arranged in upper and lower, the outlet of the second pump shell (3) is connected with the inlet of the first pump shell (2) by connecting pipe (19), the outlet of the first pump shell (2) is connected with liquid outlet pipe (17), double-shaft drive assembly is rotatably connected in the shell (1), the double-shaft drive assembly includes coaxial first drive shaft (4) and second drive shaft (5) arrangement, the first drive shaft (4) is connected with rotary drive assembly, and the first drive shaft (4) is fixedly connected with first impeller (7) in the first pump shell (2), first inner spline is fixedly connected on the inner wall of the first drive shaft (4), the second drive shaft (5) includes upper shaft (51) and lower shaft (52) arranged in upper and lower, the upper shaft (51) penetrates the first drive shaft (4) and is slidably connected with the first drive shaft (4), the outer wall of the upper shaft (51) is fixedly connected with second boss (8), first outer spline (9) and second outer spline (10) sequentially arranged from top to bottom, the second boss (8) is connected with lifting drive assembly (11), the first outer spline (9) is compatible with the first inner spline structure, the lower shaft (52) is rotatably connected in the shell (1), the outer wall of the lower shaft (52) is fixedly connected with second impeller (12) in the second pump shell (3), the inner wall of the lower shaft (52) is fixedly connected with second inner spline (13) compatible with the second outer spline (10) structure; The outer side wall of the shell (1) is fixedly connected with mounting table (61), and the rotary drive assembly and the lifting drive assembly are fixedly installed on the mounting table (61); The shell (1), the first drive shaft (4) and the upper shaft (51) all include upper section, middle section and lower section that can be detachably connected from top to bottom, the first pump shell (2) and the second pump shell (3) are fixedly connected on the lower section of the shell (1), and the first impeller (7) is fixedly connected on the lower section of the first drive shaft (4).

2. The long shaft submersible pump of claim 1, wherein: The rotary drive assembly includes rotary drive motor (62), driving gear (63), driven gear (64), first boss (65) and first annular boss, the rotary drive motor (62) is fixedly connected on the mounting table (61), the output shaft of the rotary drive motor (62) is fixedly connected with the driving gear (63) coaxially, the driven gear (64) and the first boss (65) are both fixedly connected coaxially on the outer side wall of the first drive shaft (4), the driven gear (64) is meshingly connected with the driving gear (63), and the first boss (65) is lapped on the first annular boss, and the first annular boss is fixed on the inner wall of the shell (1).

3. The long shaft submersible pump of claim 1, wherein: The height of the middle section of the shell (1) is not higher than the height of the middle section of the first drive shaft (4), and the height of the middle section of the first drive shaft (4) is not higher than the height of the middle section of the upper shaft (51).

4. The long shaft submersible pump of claim 1, wherein: The lifting drive assembly (11) comprises a lifting support (111) fixedly connected to the mounting table (61), a lifting drive motor (112) fixedly connected to the top surface of the top plate of the lifting support (111), a threaded rod (113) rotatably connected to the bottom surface of the top plate of the lifting support (111), guide rods (114) fixedly connected to the lifting support (111) and symmetrically arranged on both sides of the threaded rod (113), the top end of the threaded rod (113) is fixedly connected with the output shaft of the lifting drive motor (112), a nut seat on the threaded rod (113) is fixedly connected with a lifting disc (115), the lifting disc (115) is provided with a guide hole adaptedly connected with the guide rods (114), and the bottom surface of the lifting disc (115) is detachably connected with two support seats (116) symmetrically arranged on both sides of the second annular protrusion (8), and the support seat (116) is provided with a bearing groove (117) slidably connected with the second annular protrusion (8).

5. The long shaft submersible pump of claim 4, wherein: The top end of the upper shaft (51) is fixedly connected with a magnetic metal block (15), the bottom end of the threaded rod (113) is provided with a clearance slot adapted to the structure of the upper shaft (51), and the bottom of the clearance slot is fixedly connected with a magnet block, which is arranged opposite to the magnetic metal block (15) in an up-down direction.

6. The long shaft submersible pump of claim 4, wherein: The top surface of the lower shaft (52) is provided with a socket groove adapted to the structure of the upper shaft (51), and the inner wall of the socket groove is provided with the second inner spline (13), the bottom end of the upper shaft (51) is in contact with the bottom of the socket groove, the first outer spline (9) is connected with the first inner spline, and the second outer spline (10) is connected with the second inner spline (13).

7. The long shaft submersible pump of claim 1, wherein: The outer wall of the lower shaft (52) is fixedly connected with a third annular protrusion (16) overlapped on the second annular protrusion on the inner wall of the shell (1).

8. The long shaft submersible pump of claim 1, wherein: The inlet of the second pump shell (3) is detachably connected with a filter screen (18).

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