Long-shaft submerged pump

Abstract

The invention discloses a long-shaft submerged pump, and belongs to the technical field of submerged pumps, the long-shaft submerged pump comprises a shell, a double-shaft driving assembly is rotatably connected in the shell, the double-shaft driving assembly comprises a first driving shaft and a second driving shaft which are coaxially arranged, the first driving shaft is connected with a rotary driving assembly, the first driving shaft is fixedly connected with a first impeller, and the second driving shaft is fixedly connected with a second impeller. A first internal 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 in sliding connection with the first driving shaft, a second convex ring, a first external spline and a second external spline are fixedly connected to the outer wall of the upper shaft, and the second convex ring is connected with a lifting driving assembly; the lower shaft is rotationally connected into 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. According to the long-shaft submerged pump with the structure, the lift of the submerged pump can be adjusted without disassembling the submerged pump, and the long-shaft submerged pump is convenient and fast to use.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible pumps, and in particular relates to a long-axis submersible pump. Background Art

[0002] A submersible pump is a positive-pressure vertical pump that effectively solves the problems of air lock and cavitation. Currently, operators often use submersible pumps when transporting liquids. However, existing submersible pumps often use the pump body and impeller of a single-stage centrifugal pump as the hydraulic components of the pump. This structural design has the disadvantage of generally low head and difficulty in adjustment. The Chinese patent application number CN202022523868.3 provides a long-axis submersible pump, including a water inlet section component, the water inlet section component is connected to a first flow guide component by bolts, the first flow guide component is connected to a second flow guide component by bolts, the second flow guide component is connected to a lower connecting pipe by bolts, the top of the lower connecting pipe is movably connected to a first connecting plate, the top of the first connecting plate is movably connected to a middle connecting pipe, the lower connecting pipe, the first connecting plate and the middle connecting pipe are fixedly connected by bolts, the top of the middle connecting pipe is movably connected to the second connecting plate, the top of the second connecting plate is movably connected to an upper connecting pipe, the middle connecting pipe, the second connecting plate and the upper connecting pipe are fixedly connected by bolts, and the top of the upper connecting pipe The water outlet section is connected by bolts, the top of the water outlet section is fixedly connected to the motor bracket by bolts, the middle part of the top of the water outlet section is fixedly connected to the mechanical seal cover by bolts, the interior of the first connecting disk is movably sleeved with the lower shaft, the top of the lower shaft is located inside the middle connecting pipe, the bottom end of the lower shaft passes through the lower connecting pipe, the second guide component, the first guide component and the water inlet section component in sequence and extends to the interior of the water inlet section component and is movably sleeved with the bottom of the inner cavity of the water inlet section component, the outer surface of the lower shaft is fixedly sleeved with the first impeller located inside the first guide component, the outer surface of the lower shaft is fixedly sleeved with the second impeller located inside the second guide component, the first impeller and the second impeller are both tightened to the outer surface of the lower shaft by expansion sleeves, and the first impeller and the second impeller themselves are detachable.

[0003] While the operator can disassemble and resize the first and second impellers to adjust the flow rate of the water pump, and can also adjust the pump head by increasing or decreasing the number of impeller stages, thereby satisfying user requirements for different heads and increasing the practicality of the submersible pump, the above-mentioned structure, however, presents the following problems: the submersible pump must be shut down, disassembled, and then the first impeller must be installed or removed to adjust the submersible pump head, resulting in a complex adjustment process.

[0004] In order to solve the above problems, it is necessary to provide a new type of submersible pump. Summary of the Invention

[0005] The object of the present invention is to provide a long-axis submersible pump, which can adjust the head of the submersible pump conveniently and quickly without disassembling the submersible pump.

[0006] To achieve the above-mentioned objectives, the present invention provides a long-axis submersible pump, comprising a casing, the bottom of which is fixedly connected to a first pump casing and a second pump casing arranged above and below, a dual-shaft drive assembly being rotatably connected in the casing, the dual-shaft drive assembly comprising a first drive shaft and a second drive shaft arranged coaxially, the first drive shaft being connected to the rotation drive assembly, and the first drive shaft being fixedly connected to a first impeller located in the first pump casing, a first internal spline being fixedly connected on the inner wall of the first drive shaft, the second drive shaft comprising an upper shaft and a lower shaft arranged above and below, the upper shaft passing through the first drive shaft and being slidably connected to the first drive shaft, a second convex ring, a first external spline and a second external spline being fixedly connected on the outer wall of the upper shaft, which are arranged in sequence from top to bottom, the second convex ring being connected to the lifting drive assembly, the first external spline being adapted to the first internal spline structure, the lower shaft being rotatably connected in the casing, the outer wall of the lower shaft being fixedly connected to the second impeller located in the second pump casing, and the inner wall of the lower shaft being fixedly connected to a second internal spline adapted to the second external spline structure.

[0007] Preferably, the rotary drive assembly includes a mounting platform, a rotary drive motor, a driving gear, a driven gear, a first protrusion and a first annular boss. The mounting platform is fixedly connected to the outer side wall of the shell, the rotary drive motor is fixedly connected to the mounting platform, the output shaft of the rotary drive motor is fixedly connected to the driving gear coaxially, the driven gear and the first protrusion are both fixedly connected to the outer side wall of the first drive shaft coaxially, the driven gear is meshed with the driving gear, the first protrusion overlaps the first annular boss, and the first annular boss is fixed to the inner wall of the shell.

[0008] Preferably, the casing, the first drive shaft and the upper shaft all include an upper section, a middle section and a lower section that are detachably connected from top to bottom, the height of the middle section of the casing is not higher than the height of the middle section of the first drive shaft, the height of the middle section of the first drive shaft is not higher than the height of the middle section of the upper shaft, the first pump casing and the second pump casing are fixedly connected to the lower section of the casing, and the first impeller is fixedly connected to the lower section of the first drive shaft.

[0009] Preferably, the lifting drive assembly includes a lifting bracket fixedly connected to the mounting platform, the top surface of the top plate of the lifting bracket is fixedly connected to the lifting drive motor, the bottom surface of the top plate of the lifting bracket is rotatably connected to a threaded rod, guide rods fixed to the lifting bracket are symmetrically provided on both sides of the threaded rod, the top of the threaded rod is fixedly connected to the output shaft of the lifting drive motor, the nut seat on the threaded rod is fixedly connected to the lifting plate, the lifting plate is provided with a guide hole adapted to be connected to the guide rod, and the bottom surface of the lifting plate is detachably connected to two support seats, the two support seats are symmetrically provided on both sides of the second convex ring, and the support seat is provided with a supporting groove slidably connected to the second convex ring.

[0010] Preferably, the top end of the upper shaft is fixedly connected to a magnetic metal block, the bottom end of the threaded rod is provided with a clearance groove adapted to the upper shaft structure, the bottom of the clearance groove is fixedly connected to a magnet block, and the magnet block and the magnetic metal block are arranged relative to each other up and down.

[0011] Preferably, a socket slot is provided on the top surface of the lower shaft, and the socket slot is adapted to the structure of the upper shaft. The second internal spline is provided on the inner wall of the socket slot. After the bottom end of the upper shaft contacts the bottom of the socket slot, the first external spline is connected to the first internal spline, and the second external spline is connected to the second internal spline.

[0012] Preferably, a third protrusion is fixedly connected to the outer wall of the lower shaft, and the third protrusion overlaps the second annular boss on the inner wall of the shell.

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

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

[0015] Therefore, the present invention adopts a long-axis submersible pump with the above-mentioned structure, which has the following beneficial effects: the lifting and lowering of the upper shaft in the dual-axis drive assembly is used to switch between the first impeller's independent rotation mode and the first impeller and the second impeller's joint rotation mode, thereby achieving the purpose of adjusting the submersible pump head. The entire process does not require disassembly of the submersible pump to achieve the adjustment of the submersible pump head, which is convenient and quick.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of an embodiment of a long-axis submersible pump of the present invention; Figure 2This is a schematic structural diagram of an embodiment of a dual-shaft drive assembly in a long-shaft submersible pump of the present invention; Figure 3 This is a schematic structural diagram of an embodiment of a first drive shaft in a long-shaft submersible pump of the present invention; Figure 4 This is a schematic structural diagram of an embodiment of an upper shaft in a long-shaft submersible pump according to the present invention; Figure 5 This is a schematic structural diagram of an embodiment of a lower shaft in a long-shaft submersible pump according to the present invention; Figure 6 The figure is a structural schematic diagram of an embodiment of a lifting drive assembly in a long-axis submersible pump of the present invention.

[0018] In the figure: 1. casing; 2. first pump casing; 3. second pump casing; 4. first drive shaft; 5. second drive shaft; 51. upper shaft; 52. lower shaft; 61. mounting platform; 62. rotary drive motor; 63. driving gear; 64. driven gear; 65. first flange; 7. first impeller; 8. second flange; 9. first external spline; 10. second external spline; 11. lifting drive assembly; 111. lifting bracket; 112. lifting drive motor; 113. threaded rod; 114. guide rod; 115. lifting plate; 116. support seat; 117. supporting groove; 12. second impeller; 13. second internal spline; 14. flange; 15. magnetic metal block; 16. third flange; 17. liquid outlet pipe; 18. filter screen; 19. connecting pipe. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0021] Reference Figures 1-6As shown, this embodiment provides a long-axis submersible pump, including a housing 1, the bottom of which is fixedly connected to a first pump housing 2 and a second pump housing 3 arranged above and below. A dual-axis drive assembly is rotatably connected within the housing 1, and the dual-axis drive assembly includes a first drive shaft 4 and a second drive shaft 5 arranged coaxially. The first drive shaft 4 is connected to the rotary drive assembly, and the first drive shaft 4 is fixedly connected to the first impeller 7 located within the first pump housing 2. A first internal spline is fixedly connected to the inner wall of the first drive shaft 4. The rotary drive assembly is used to drive the first drive shaft 4 to rotate and thereby drive the first impeller 7 to rotate.

[0022] The second drive shaft 5 includes an upper shaft 51 and a lower shaft 52, which are arranged vertically. The upper shaft 51 passes through the first drive shaft 4 and is slidably connected to the first drive shaft 4. The outer wall of the upper shaft 51 is fixedly connected to a second flange 8, a first external spline 9, and a second external spline 10, which are arranged in sequence from top to bottom. The second flange 8 is connected to a lifting drive assembly 11. The lifting drive assembly 11 is used to drive the second flange 8 to rise and fall, thereby achieving the lifting and lowering of the upper shaft 51 as a whole. The first external spline 9 is adapted to the first internal spline structure. After the upper shaft 51 is lowered, the first external spline 9 is connected to the first internal spline, so that the first drive shaft 4 can drive the upper shaft 51 to rotate. The lower shaft 52 is rotatably connected to the housing 1. The second impeller 12 located in the second pump housing 3 is fixedly connected to the outer wall of the lower shaft 52. The second internal spline 13 adapted to the second external spline 10 structure is fixedly connected to the inner wall of the lower shaft 52. After the upper shaft 51 descends, the second external spline 10 is connected to the second internal spline 13 , so that the upper shaft 51 can drive the lower shaft 52 to rotate.

[0023] When in use, the rotary drive assembly drives the first drive shaft 4 to rotate and then drives the first impeller 7 to rotate, and the first impeller 7 is used to provide power for the pumping of the liquid. When it is necessary to increase the head of the submersible pump, the lifting drive assembly 11 is started, so that the lifting power device drives the second flange 8 to descend, thereby realizing the overall descent of the upper shaft 51. After the upper shaft 51 descends, the first external spline 9 is connected to the first internal spline, and the second external spline 10 is connected to the second internal spline 13. The connection between the first external spline 9 and the first internal spline enables the first drive shaft 4 to drive the upper shaft 51 to rotate, and the second external spline 1 0 and the second internal spline 13 can enable 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 realizing the increase of the head of the submersible pump; when it is necessary to restore the head of the submersible pump, the lifting drive assembly 11 is started, so that the lifting power device drives the second flange 8 to rise, thereby realizing the overall rise of the upper shaft 51. After the upper shaft 51 rises, the first external spline 9 is separated from the first internal spline, and the second external spline 10 is separated from the second internal spline 13. At this time, the second impeller 12 does not rotate, and only the first impeller 7 rotates to provide conveying power for the liquid.

[0024] In a further preferred embodiment, the rotary drive assembly includes a mounting platform 61, a rotary drive motor 62, a driving gear 63, a driven gear 64, a first flange 65 and a first annular boss. The mounting platform 61 is fixedly connected to the outer wall of the shell 1, the rotary drive motor 62 is fixedly connected to the mounting platform 61, the output shaft of the rotary drive motor 62 is fixedly connected to the driving gear 63 coaxially, the driven gear 64 and the first flange 65 are both coaxially fixedly connected to the outer wall of the first drive shaft 4, the driven gear 64 is meshed with the driving gear 63, the first flange 65 is overlapped on the first annular boss, and the first annular boss is fixed to the inner wall of the shell 1.

[0025] During use, the first protrusion 65 and the first annular boss cooperate to realize the rotational connection of the first drive shaft 4 in the housing 1. After starting the rotation drive motor 62, the rotation drive motor 62 drives the driving gear 63 to rotate, and the driving gear 63 drives the driven gear 64 to rotate to realize the rotation of the first drive shaft 4. After the first drive shaft 4 rotates, it drives the first impeller 7 to rotate, providing power for pumping the liquid.

[0026] A further preferred embodiment is that the casing 1, the first drive shaft 4 and the upper shaft 51 all include an upper section, a middle section and a lower section that are detachably connected from top to bottom, the height of the middle section of the casing 1 is not higher than the height of the middle section of the first drive shaft 4, 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, the first pump casing 2 and the second pump casing 3 are fixedly connected to the lower section of the casing 1, and the first impeller 7 is fixedly connected to the lower section of the first drive shaft 4.

[0027] When in use, the upper section, the middle section and the lower section can be connected by the flange 14. By replacing the middle section of different lengths to change the overall length of the submersible pump, the device can be used under different liquid level heights and has greater applicability.

[0028] In a further preferred embodiment, the lift drive assembly 11 includes a lift bracket 111 fixedly connected to the mounting platform 61. A lift drive motor 112 is fixedly connected to the top surface of the top plate of the lift bracket 111. A threaded rod 113 is rotatably connected to the bottom surface of the top plate of the lift bracket 111. Guide rods 114, fixed to the lift bracket 111, are symmetrically disposed on either side of the threaded rod 113. The top end of the threaded rod 113 is fixedly connected to the output shaft of the lift drive motor 112, and the nut seat on the threaded rod 113 is fixedly connected to a lift plate 115. The lift plate 115 is provided with guide holes that mate with the guide rods 114. Two support blocks 116 are detachably attached to the bottom surface of the lift plate 115. The two support blocks 116 are symmetrically disposed on either side of the second bead 8. Each support block 116 is provided with a bearing groove 117 that is slidably connected to the second bead 8. The cooperation between the bearing grooves 117 and the second bead 8 enables the upper shaft 51 to rotate.

[0029] During use, the lifting drive motor 112 drives the threaded rod 113 to rotate, which in turn drives the lifting plate 115 to move up and down along the guide rod 114. Since the second flange 8 is connected to the support groove 117 on the lifting plate 115, the lifting plate 115 can drive the second flange 8 and the upper shaft 51 to move up and down. The lifting bracket 111 and the mounting platform 61 can be connected by bolts, and the detachable connection between the support base 116 and the lifting plate 115 facilitates the disassembly and maintenance of the upper shaft 51.

[0030] A further preferred solution is that the top end of the upper shaft 51 is fixedly connected to a magnetic metal block 15, and the bottom end of the threaded rod 113 is provided with a clearance groove adapted to the structure of the upper shaft 51, and the bottom of the clearance groove is fixedly connected to a magnet block, and the magnet block and the magnetic metal block 15 are arranged opposite to each other up and down.

[0031] During use, the combination of the magnetic metal block 15 and the magnet block can provide an upward pulling force for the upper shaft 51 after the upper shaft 51 rises, share the load on the support seat 116, avoid deformation of the support seat 116 after long-term use, and improve the service life of the entire lifting drive assembly 11.

[0032] A further preferred solution is that a socket slot is provided on the top surface of the lower shaft 52, and the socket slot is adapted to the structure of the upper shaft 51. A second internal spline 13 is provided on the inner wall of the socket slot. After the bottom end of the upper shaft 51 contacts the bottom of the socket slot, the first external spline 9 is connected to the first internal spline, and the second external spline 10 is connected to the second internal spline 13.

[0033] When in use, the socket can provide support for the upper shaft 51 after the upper shaft 51 descends, share the load on the support seat 116, avoid deformation of the support seat 116 after long-term use, and improve the service life of the entire lifting drive assembly 11.

[0034] In a further preferred embodiment, a third protrusion 16 is fixedly connected to the outer wall of the lower shaft 52 , and the third protrusion 16 overlaps the second annular boss on the inner wall of the housing 1 .

[0035] During use, the third protrusion 16 and the second annular boss cooperate to enable the lower shaft 52 to rotate within the housing 1 .

[0036] In a further preferred embodiment, the outlet of the second pump housing 3 is connected to the inlet of the first pump housing 2 via a connecting pipe 19, and the outlet of the first pump housing 2 is connected to the liquid outlet pipe 17. The connecting pipe 19 is used to realize the series connection of the first pump housing 2 and the second pump housing 3, and the liquid outlet pipe 17 is used to realize the pumping out of the liquid.

[0037] During operation, the outlet of the first pump housing 2 and the liquid outlet pipe 17 can be detachably connected, facilitating maintenance and replacement of the first pump housing 2 and the liquid outlet pipe 17. The top of the sidewall of the liquid outlet pipe 17 can be fixedly connected to the mounting platform 61, which improves the stability of the liquid outlet pipe 17. The liquid outlet pipe 17 can be segmented, with each segment detachably connected to the other, making it easy to change the length of the liquid outlet pipe 17 by replacing a specific segment.

[0038] In a further preferred embodiment, a filter screen 18 is detachably connected to the inlet of the second pump housing 3 .

[0039] When in use, the filter screen 18 can filter impurities in the liquid to prevent the impurities from clogging the submersible pump.

[0040] Therefore, the present invention adopts a long-axis submersible pump with the above structure, which can adjust the head of the submersible pump without disassembling the submersible pump, which is convenient and quick.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A long-axis submersible pump, characterized in that: The invention comprises a housing (1), wherein the bottom of the housing (1) is fixedly connected to a first pump housing (2) and a second pump housing (3) arranged in an upper and lower position, wherein a dual-shaft drive assembly is rotatably connected in the housing (1), wherein the dual-shaft drive assembly comprises a first drive shaft (4) and a second drive shaft (5) arranged coaxially, wherein the first drive shaft (4) is connected to the rotary drive assembly, and the first drive shaft (4) is fixedly connected to a first impeller (7) located in the first pump housing (2), wherein a first internal spline is fixedly connected to the inner wall of the first drive shaft (4), and the second drive shaft (5) comprises an upper shaft (51) and a lower shaft (52) arranged in an upper and lower position, wherein the upper shaft (51) passes through the first drive shaft (51) and the second drive shaft (52). The upper shaft (51) is fixedly connected to the outer wall of the upper shaft (51) with a second convex ring (8), a first external spline (9) and a second external spline (10) arranged in sequence from top to bottom, the second convex ring (8) is connected to the lifting drive assembly (11), the first external spline (9) is adapted to the first internal spline structure, the lower shaft (52) is rotatably connected in the housing (1), the outer wall of the lower shaft (52) is fixedly connected to the second impeller (12) located in the second pump housing (3), and the inner wall of the lower shaft (52) is fixedly connected to the second internal spline (13) adapted to the second external spline (10) structure.

2. The long-axis submersible pump according to claim 1, characterized in that: The rotary drive assembly comprises a mounting platform (61), a rotary drive motor (62), a driving gear (63), a driven gear (64), a first convex ring (65) and a first annular boss. The mounting platform (61) is fixedly connected to the outer wall of the housing (1). The rotary drive motor (62) is fixedly connected to the mounting platform (61). The output shaft of the rotary drive motor (62) is fixedly connected to the driving gear (63) coaxially. The driven gear (64) and the first convex ring (65) are both coaxially fixedly connected to the outer wall of the first drive shaft (4). The driven gear (64) is meshed with the driving gear (63). The first convex ring (65) is overlapped on the first annular boss. The first annular boss is fixed to the inner wall of the housing (1).

3. The long-axis submersible pump according to claim 1, characterized in that: The housing (1), the first drive shaft (4) and the upper shaft (51) all include an upper section, a middle section and a lower section that are detachably connected from top to bottom. The height of the middle section of the housing (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). The first pump housing (2) and the second pump housing (3) are fixedly connected to the lower section of the housing (1), and the first impeller (7) is fixedly connected to the lower section of the first drive shaft (4).

4. The long-axis submersible pump according to claim 2, characterized in that: The lifting drive assembly (11) includes a lifting bracket (111) fixedly connected to the mounting platform (61), the top surface of the top plate of the lifting bracket (111) is fixedly connected to the lifting drive motor (112), the bottom surface of the top plate of the lifting bracket (111) is rotatably connected to a threaded rod (113), guide rods (114) fixed to the lifting bracket (111) are symmetrically arranged on both sides of the threaded rod (113), the top end of the threaded rod (113) is fixedly connected to the output shaft of the lifting drive motor (112), the nut seat on the threaded rod (113) is fixedly connected to the lifting plate (115), the lifting plate (115) is provided with a guide hole adapted to be connected to the guide rod (114), the bottom surface of the lifting plate (115) is detachably connected to two support seats (116), the two support seats (116) are symmetrically arranged on both sides of the second convex ring (8), and the support seats (116) are provided with a supporting groove (117) slidably connected to the second convex ring (8).

5. The long-axis submersible pump according to claim 4, characterized in that: The top end of the upper shaft (51) is fixedly connected to a magnetic metal block (15), the bottom end of the threaded rod (113) is provided with a clearance groove adapted to the structure of the upper shaft (51), the bottom of the clearance groove is fixedly connected to a magnet block, and the magnet block and the magnetic metal block (15) are arranged opposite to each other in the upper and lower directions.

6. The long-axis submersible pump according to claim 4, characterized in that: A socket slot is provided on the top surface of the lower shaft (52), and the socket slot is adapted to the structure of the upper shaft (51). The inner wall of the socket slot is provided with the second internal spline (13). After the bottom end of the upper shaft (51) contacts the bottom of the socket slot, the first external spline (9) is connected to the first internal spline, and the second external spline (10) is connected to the second internal spline (13).

7. The long-axis submersible pump according to claim 1, characterized in that: A third convex ring (16) is fixedly connected to the outer wall of the lower shaft (52), and the third convex ring (16) overlaps the second annular boss on the inner wall of the housing (1).

8. The long-axis submersible pump according to claim 1, characterized in that: The outlet of the second pump housing (3) is connected to the inlet of the first pump housing (2) via a connecting pipe (19), and the outlet of the first pump housing (2) is connected to the liquid outlet pipe (17).

9. The long-axis submersible pump according to claim 1, characterized in that: A filter screen (18) is detachably connected to the inlet of the second pump housing (3).

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