Deep well submersible pump

Abstract

The invention relates to the technical field of submersible pumps, and discloses a deep well submersible pump, which includes: a submersible motor, a coupling, a connecting frame, a main shaft, a suction section, a plurality of impellers, a plurality of guide vanes, a sand flushing pipe and a check valve; a sand collecting ring groove is provided at the bottom end of the suction section, a sand leakage hole is provided at the top end of the connecting frame, a sand collecting cavity is provided in the connecting frame, the sand collecting ring groove is connected to the sand collecting cavity through the sand leakage hole, a hole cover is provided in the sand collecting cavity which is slidably connected to the connecting frame, the hole cover can open and close the sand leakage hole by sliding up and down, a liquid inlet hole and a sand outlet hole connected to the sand collecting cavity are also provided on the peripheral wall of the connecting frame, the liquid inlet hole and the sand outlet hole are arranged oppositely, the first end of the sand flushing pipe is connected to the liquid inlet hole, and the second end thereof is connected to the bottom of the pump cavity, and a solenoid valve is connected in series on the sand flushing pipe. The invention has the functions of collecting silt, isolating silt, and automatically flushing and discharging silt.

Description

Technical Field

[0001] The invention relates to the technical field of submersible pumps, in particular to a deep well submersible pump. Background Art

[0002] As a general-purpose machinery, deep well submersible pumps are widely used in various industries and fields, such as underground oil lifting, seawater lifting and auxiliary drilling on offshore platforms, vacuum pre-pressure dewatering for land reclamation, fire protection for marine facilities and islands, long-distance water transmission for water conservancy projects, civil underground drinking water, agricultural reservoir river drainage and irrigation, garden sprinkler irrigation, hot spring bathing, and water supply and drainage in cities, subways, mines, and industrial and mining enterprises.

[0003] Since the submersible pump directly submerges into the pumping medium, which often contains a large amount of impurities such as silt, it is very important to prevent sand from entering the submersible motor of the deep well submersible pump, isolate sand, and prevent the main shaft from scouring and wearing. In the prior art, the deep well submersible pump does not have the function of collecting and automatically flushing silt. The silt is very easy to accumulate in the coupling frame, coupling, and sand throwing cover of the submersible pump. As the rotor components of the pump rotate at high speed, the accumulated silt and other impurities will rapidly wear the coupling, sand throwing cover, and the sealing device of the submersible motor and enter the submersible motor, causing serious damage to the submersible motor. Summary of the invention

[0004] The purpose of the invention is to design a deep well submersible pump which can prevent the coupling and the submersible motor from being worn by mud and sand.

[0005] In order to achieve the above-mentioned object, the present invention provides a deep well submersible pump, comprising: a submersible motor, a coupling, a connecting frame, a main shaft, a suction section, a plurality of impellers, a plurality of guide vanes, a sand flushing pipe and a check valve;

[0006] The submersible motor has an upwardly extending power output end, the power output end is coaxially connected with the main shaft through a coupling, the connecting frame is sleeved on the coupling and installed on the upper end of the submersible motor, a water inlet is provided on the peripheral wall of the suction section, the connecting frame, the suction section, the guide vane and the check valve are fixedly connected in sequence from bottom to top, and the top of the connecting frame, the inner peripheral wall of the suction section, the inner peripheral wall of the guide vane and the bottom end of the check valve are surrounded to form a pump chamber; each of the impellers is sleeved on the main shaft in sequence and is located in the pump chamber, and the impeller is fixedly connected to the main shaft;

[0007] A sand collecting ring groove is provided at the bottom end of the suction section, a sand leakage hole is provided at the top end of the connecting frame, a sand collecting chamber is provided in the connecting frame, the sand collecting ring groove is connected with the sand collecting chamber through the sand leakage hole, a hole cover is provided in the sand collecting chamber which is slidably connected with the connecting frame, and the hole cover can open and close the sand leakage hole by sliding up and down, a liquid inlet hole and a sand outlet hole which are connected to the sand collecting chamber are also provided on the peripheral wall of the connecting frame, the liquid inlet hole and the sand outlet hole are arranged opposite to each other, a first end of the sand flushing pipe is connected with the liquid inlet hole, and a second end thereof is connected to the bottom of the pump chamber, and a solenoid valve is connected in series on the sand flushing pipe.

[0008] Furthermore, it also includes: a sand-proof cover and a sand-proof ring;

[0009] A sand collecting groove is formed on the top of the connecting frame and is arranged in a ring around the coupling. The sand-proof cover is passed through the coupling and fixedly installed in the sand-collecting groove. The sand leakage holes are arranged in the sand-collecting groove and are located around the sand-proof cover. Part of the outer peripheral wall of the coupling, the top of the sand-proof cover, the sand-collecting groove and part of the inner peripheral wall of the suction section are combined to form the sand-collecting ring groove. The top of the sand-proof cover gradually tilts downward along its radial direction outward.

[0010] Furthermore, a closed cavity is formed between the inner wall of the connecting frame, part of the outer peripheral wall of the coupling, and part of the end of the submersible motor. A first wire inlet hole and a first wire outlet hole connected to the closed cavity are opened on the connecting frame. The first wire inlet hole is located at the bottom of the closed cavity. The submersible motor has a cable, and the cable is sequentially passed through the first wire inlet hole and the first wire outlet hole from the top of the submersible motor and is sealed and connected to the closed cavity.

[0011] Further, the check valve comprises a check valve body, a check ring, a stop pin, a valve stem and a valve cover, the lower end of the check valve body is connected to the guide vane, the check ring is arranged at one end of the check valve body connected to the guide vane, the check valve body is provided with a first channel extending along its central axis, the valve stem is passed through the first channel and is slidably connected to the check valve body, the valve cover is fixedly connected to the lower end of the valve stem and can move up and down relative to the check ring; when the valve cover moves to abut against the check ring, the check valve is closed, and when the valve cover moves away from the check ring, the check valve is opened;

[0012] The check valve body is radially provided with a second channel, one end of which is connected to the first channel, the stop pin is inserted into the second channel, and an elastic component is connected between the stop pin and the check valve body, and the elastic component is used to drive the stop pin to move in the direction of the first channel; a stop groove matched with the stop pin is provided on the outer peripheral wall of the valve stem, and the stop groove is located at the end of the valve stem away from the valve cover.

[0013] Furthermore, the coupling has an upper opening for installing the main shaft and a lower opening for installing the power output end of the submersible motor. The inner circumferential wall of the coupling is provided with a first step portion arranged toward the upper opening and a second step portion arranged toward the lower opening. The first step portion and the second step portion are arranged with an upper and lower interval. The main shaft is transmission-connected to the coupling through a flat key, and the lower end of the main shaft abuts against the first step portion. The power output end of the submersible motor is transmission-connected to the coupling through a flat key, and the power output end of the submersible motor and the second step portion are clearance-fitted.

[0014] Furthermore, it also includes a first sleeve, a first bearing sleeve and a plurality of sleeve assemblies, the first sleeve and the plurality of sleeve assemblies are sequentially sleeved on the main shaft from bottom to top, the lower end of the first sleeve is connected to the upper end of the coupling, the upper end of the first sleeve is connected to the sleeve assembly, the first bearing sleeve is sleeved on the first sleeve, and the first bearing sleeve is connected to the suction section; the sleeve assembly includes a connecting bearing sleeve, and an elastic ring, an interstage sleeve and a connecting sleeve sequentially arranged from bottom to top, the connecting bearing sleeve is sleeved on the connecting sleeve, each of the impellers is correspondingly arranged between the interstage sleeve and the interpolar sleeve in each of the sleeve assemblies, the lower end of the impeller abuts against the interstage sleeve, the upper end of the impeller is connected to the connecting sleeve, and each of the connecting bearing sleeves is correspondingly connected to each of the guide vanes.

[0015] Furthermore, the shaft sleeve assembly also includes a bolt member, a connecting platform is provided on the outer peripheral wall of the connecting shaft sleeve, the lower end of the connecting platform is flush with the lower end of the connecting shaft sleeve, and a threaded countersunk hole is opened at the upper end of the connecting platform. The bolt member passes through the threaded countersunk hole from top to bottom and is fixedly connected to the impeller.

[0016] Furthermore, it also includes a front ring and a rear ring, both of which are installed on the guide vane, and the front ring is matched with the bottom end of the guide vane, and the rear ring is matched with the top end of the guide vane, the guide vane connected to the check valve is defined as a last-stage guide vane, and the guide vane arranged in the last-stage guide vane is defined as a last-stage guide vane, and the last-stage guide vane has an abutment plane arranged opposite to the rear ring on the last-stage guide vane in the axial direction, a thrust ring is arranged on the abutment plane, and an axial thrust gap Lmm is provided between the thrust ring and the rear ring, satisfying: 0.5≤L≤1.5.

[0017] Furthermore, a plurality of anti-rotation ribs extending in the axial direction and radial direction of the main shaft are provided in the pump chamber, and each of the anti-rotation ribs is respectively connected to any one of the suction section and the guide vanes.

[0018] Furthermore, a balancing disk is provided at one end of the main shaft close to the check valve, and a balancing chamber is provided at a side of the balancing disk away from the check valve.

[0019] Compared with the prior art, the deep well submersible pump according to the embodiment of the present invention has the following beneficial effects:

[0020] The deep well submersible pump of the embodiment of the present invention forms a sand collecting ring groove by combining the bottom end of the suction section with the connecting frame, a sand collecting chamber is arranged in the connecting frame, the sand collecting ring groove is connected with the sand collecting chamber through a sand leakage hole, a hole cover that can move up and down is arranged under the sand leakage hole, a sand flushing pipe is arranged between the bottom of the pump chamber and the sand collecting chamber, and a solenoid valve is arranged on the sand flushing pipe. Under the natural state, the hole cover moves down to open the sand leakage hole, and the sand entering the suction section and the pump chamber settles down in the sand collecting ring groove, and then enters the sand collecting chamber through the sand leakage hole; when the submersible motor stops, the liquid in the pump chamber enters the sand collecting chamber from the sand flushing pipe through the control of the solenoid valve, and the water flow force causes the hole cover to move up to close the sand leakage hole, and at the same time, the sand collected in the sand collecting chamber is flushed out of the sand collecting chamber. The present invention has the functions of collecting sand, isolating sand, and automatically flushing and discharging sand, and can eliminate impurities such as sand in the pumping medium so that they will not enter the submersible motor and damage the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of a deep well submersible pump according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0023] Figure 3 yes Figure 1 The enlarged schematic diagram of point B in the middle;

[0024] Figure 4 yes Figure 1 The enlarged schematic diagram of the center C;

[0025] Figure 5 yes Figure 1 The enlarged schematic diagram of point D in the middle;

[0026] Figure 6 yes Figure 1 The enlarged schematic diagram of point E in the middle;

[0027] Figure 7 yes Figure 1 The enlarged schematic diagram of F in the middle;

[0028] Figure 8 yes Figure 1 The enlarged schematic diagram of G in the middle;

[0029] Fig. 9 is a cross-sectional view of a connecting frame of a deep well submersible pump according to an embodiment of the present invention;

[0030] Fig.10 is a top view of a connecting frame of a deep well submersible pump according to an embodiment of the present invention;

[0031] Fig.11 is a cross-sectional view of a suction section of a deep well submersible pump according to an embodiment of the present invention;

[0032] Fig.12 is a cross-sectional view of a first-stage guide vane of a deep well submersible pump according to an embodiment of the present invention;

[0033] Fig.13 is a cross-sectional view of a check valve of a deep well submersible pump according to an embodiment of the present invention;

[0034] Fig.14 is a cross-sectional view of a valve stem of a deep well submersible pump according to an embodiment of the present invention;

[0035] Fig.15 is a cross-sectional view of a valve cover of a deep well submersible pump according to an embodiment of the present invention;

[0036] Fig.16 is a cross-sectional view of a connecting sleeve of a deep well submersible pump according to an embodiment of the present invention;

[0037] Fig.17 is a cross-sectional view of a guide rod of a deep well submersible pump according to an embodiment of the present invention;

[0038] Fig.18 is a cross-sectional view of a sand-proof cover of a deep well submersible pump according to an embodiment of the present invention;

[0039] Fig.19 is a cross-sectional view of a coupling of a deep well submersible pump according to an embodiment of the present invention;

[0040] Fig. 20 It is a cross-sectional view of a final-stage impeller of a deep well submersible pump according to an embodiment of the present invention.

[0041] In the figure, 1, submersible motor; 11, power output terminal; 12, cable; 100, pump chamber;

[0042] 2. Connecting frame; 21. Sand leakage hole; 22. Sand collecting chamber; 23. Hole cover; 231. Guide rod; 24. Liquid inlet hole; 25. Sand outlet hole; 26. Anti-sand cover; 27. Anti-sand ring; 28. Sand collecting trough; 29. ​​Closed chamber; 291. First inlet hole; 292. First outlet hole; 293. Installation window;

[0043] 3. Coupling; 31. First step portion; 32. Second step portion;

[0044] 41. spindle; 42. first sleeve; 43. first bearing sleeve; 44. sleeve assembly; 441. elastic ring; 442. interstage sleeve; 443. connecting sleeve; 444. connecting bearing sleeve; 445. bolt; 446. connecting platform; 447. threaded countersunk hole; 45. balancing plate; 451. balancing chamber;

[0045] 5. Suction section; 51. Water inlet; 52. Sand collecting ring trough;

[0046] 61. impeller; 611. final stage impeller; 612. abutment plane; 62. thrust ring; 63. keyway; 64. cavity groove; 65. balance hole;

[0047] 71. Guide vane; 711. Final guide vane; 72. Front ring; 73. Rear ring; 74. Anti-rotation rib;

[0048] 81. Sand flushing pipe; 811. Solenoid valve;

[0049] 9. Check valve; 91. Check valve body; 911. First channel; 912. Second channel; 92. Check ring; 93. Stop pin; 94. Valve stem; 941. Stop groove; 95. Valve cover; 96. Elastic component. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate 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 and simplifying the description, 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.

[0052] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0054] like Figure 1 , Figure 8 to Figure 10 As shown, a deep well submersible pump according to a preferred embodiment of the present invention comprises: a submersible motor 1, a coupling 3, a connecting frame 2, a main shaft 41, a suction section 5, a plurality of impellers 61, a plurality of guide vanes 71, a sand flushing pipe 81 and a check valve 9;

[0055] The submersible motor 1 has an upwardly extending power output end 11, which is coaxially connected to the main shaft 41 through a coupling 3. The coupling frame 2 is sleeved on the coupling 3 and installed on the upper end of the submersible motor 1. A water inlet 51 is provided on the peripheral wall of the suction section 5. The coupling frame 2, the suction section 5, the guide vane 71 and the check valve 9 are fixedly connected in sequence from bottom to top, and the top of the coupling frame 2, the inner peripheral wall of the suction section 5, the inner peripheral wall of the guide vane 71 and the bottom end of the check valve 9 enclose a pump chamber 100; each impeller 61 is sleeved on the main shaft 41 in sequence and is located in the pump chamber 100, and the impeller 61 is fixedly connected to the main shaft 41;

[0056] A sand collecting annular groove 52 is provided at the bottom end of the suction section 5, a sand leakage hole 21 is provided at the top of the connecting frame 2, a sand collecting chamber 22 is provided in the connecting frame 2, the sand collecting annular groove 52 is connected with the sand collecting chamber 22 through the sand leakage hole 21, a hole cover 23 slidably connected with the connecting frame 2 is provided in the sand collecting chamber 22, the hole cover 23 can open and close the sand leakage hole 21 by sliding up and down, a liquid inlet hole 24 and a sand outlet hole 25 connected to the sand collecting chamber 22 are also provided on the peripheral wall of the connecting frame 2, the liquid inlet hole 24 and the sand outlet hole 25 are arranged opposite to each other, a first end of the sand flushing pipe 81 is connected with the liquid inlet hole 24, and a second end thereof is connected to the bottom of the pump chamber 100, a second end of the sand flushing pipe 81 is located above the water inlet 51, and a solenoid valve 811 is connected in series to the sand flushing pipe 81.

[0057] Specifically, the bottom end of the suction section 5 is combined with the connecting frame 2 to form a sand collecting annular groove 52, a sand collecting chamber 22 is provided in the connecting frame 2, the sand collecting annular groove 52 is connected to the sand collecting chamber through the sand leakage hole 21, a sand flushing pipe 81 is provided between the bottom of the pump chamber 100 and the sand collecting chamber, and a solenoid valve 811 is provided on the sand flushing pipe 81. The guide vane 71 connected to the suction section 5 is defined as the first-stage guide vane 71, the first end of the sand flushing pipe 81 is connected to the liquid inlet hole 24, and the second end is connected to the lower part of the first-stage guide vane 71.

[0058] In the natural state, the hole cover 23 moves down to open the sand leakage hole 21, and the sand entering the suction section 5 and the pump chamber 100 settles down in the sand collecting ring groove 52, and then enters the sand collecting chamber 22 through the sand leakage hole 21; when the submersible motor 1 is shut down, the liquid in the pump chamber 100 enters the sand collecting chamber 22 from the sand flushing pipe 81 through the control of the electromagnetic valve 811, and the water flow force causes the hole cover 23 to move up to close the sand leakage hole 21, and at the same time, the sand collected in the sand collecting chamber 22 is flushed out of the sand collecting chamber 22. Since the present invention is a deep well submersible pump, it is usually necessary to set a multi-stage impeller 61 to obtain a high pressure head. When the submersible motor 1 is shut down, a huge water hammer force will be formed in the pump chamber 100, and the sand flushing pipe 81 can instantly flush the sand in the sand collecting chamber 22 by using the water hammer force.

[0059] like Fig.17 and Fig.18 As shown, in some improved solutions of the present application, it also includes: a sand-proof cover 26 and a sand-proof ring 27;

[0060] The top of the coupling frame 2 is provided with a sand collecting groove 28 arranged around the coupling 3, the sand-proof cover 26 is passed through the coupling 3 and fixedly installed in the sand collecting groove 28, the sand leakage hole 21 is arranged in the sand collecting groove 28 and is located around the sand-proof cover 26, part of the outer peripheral wall of the coupling 3, the top of the sand-proof cover 26, the sand collecting groove 28, and part of the inner peripheral wall of the suction section 5 are enclosed to form a sand collecting annular groove 52, and the top of the sand-proof cover 26 gradually tilts downward along its radial direction outward. It can further isolate sand from the main shaft 41 and the submersible motor 1, and the downward tilt of the sand-proof cover 26 can make the collected mud and sand smoothly enter the sand collecting annular groove 52 and the sand collecting cavity 22.

[0061] In some improved schemes of the present application, a guide rod 231 is also included, one end of which is fixed to the bottom of the sand collecting chamber 22, and the other end of which is a free end and is inserted into the sand leakage hole 21. There is a sand leakage gap between the peripheral wall of the guide rod 231 and the sand leakage hole 21. The guide rod 231 is provided with a clamping portion along its peripheral wall. The clamping portion is located in the sand collecting chamber 22 and is arranged close to the sand leakage hole 21. The hole cover 23 is slidably sleeved on the guide rod 231 and can move up and down between the clamping portion and the sand leakage hole 21. The moving distance of the hole cover 23 is limited, so that the hole cover 23 can open the sand leakage hole 21 conveniently, and close the sand leakage hole 21 under the action of water flow.

[0062] Since the connection frame 2 of the submersible pump in the prior art is mostly an open structure, the external medium of the submersible pump will directly contact the coupling 3 and the submersible motor 1, so that the mud and sand directly enter the connection frame 2 and rub against the sealing device of the coupling 3 and the submersible motor 1, thereby accelerating the damage of the coupling 3 and the submersible motor 1, seriously reducing the safe and reliable operation and service life of the deep well submersible pump. Therefore, in some improved schemes of the present application, the inner wall of the connection frame 2, part of the outer peripheral wall of the coupling 3, and part of the end of the submersible motor 1 are enclosed to form a closed cavity 29, and the connection frame 2 is provided with a first inlet hole 291 and a first outlet hole 292 connected to the closed cavity 29, and the first inlet hole 291 is located at the bottom of the closed cavity 29, and the submersible motor 1 has a cable 12, and the cable 12 is sequentially passed through the first inlet hole 291 and the first outlet hole 292 from the top of the submersible motor 1 and is sealed and connected to the closed cavity 29.

[0063] In some improved schemes of the present application, a temperature detection probe and a probe wire are also included. A second wire inlet hole and a second wire outlet hole connected to the closed cavity 29 are opened on the connecting frame 2. The second wire inlet hole is located at the bottom of the closed cavity 29. The temperature detection probe is installed on the submersible motor 1. One end of the probe wire is connected to the temperature detection probe, and the other end is successively passed through the second wire inlet hole and the second wire outlet hole from the top of the submersible motor 1 and is sealed and connected to the closed cavity 29.

[0064] The cable 12 of the submersible motor 1 passes through the first inlet hole 291 and the first outlet hole 292 provided on the connection frame 2, the temperature detection probe is installed on the submersible motor 1, and the probe wire passes through the second inlet hole and the second outlet hole provided on the connection frame 2, and then the connection frame 2 is installed and fixed on the submersible motor 1. The connection frame 2, the submersible motor 1, and the coupling 3 form a closed cavity 29 to prevent the silt in the liquid outside the submersible pump from entering the submersible motor 1 through the power output end 11, ensuring that the silt will not enter the submersible motor 1, and improving the safe operation and service life of the submersible motor 1. Among them, the first outlet hole 292 and the second outlet hole are both provided with sealing seams.

[0065] like Figure 2 , Figure 3 , Figure 5 , Fig.13 , Fig.14 and Fig.15As shown, in some improved schemes of the present application, the check valve 9 includes a check valve body 91, a check ring 92, a stop pin 93, a valve stem 94 and a valve cover 95. The lower end of the check valve body 91 is connected to the guide vane 71. The check ring 92 is provided at one end of the check valve body 91 connected to the guide vane 71. The check valve body 91 is provided with a first channel 911 extending along its central axis. The valve stem 94 is penetrated through the first channel 911 and is slidably connected to the check valve body 91. The valve cover 95 is fixedly connected to the lower end of the valve stem 94 and can move up and down relative to the check ring 92. When the valve cover 95 moves to abut against the check ring 92, the check valve 9 is closed, and when the valve cover 95 moves away from the check ring 92, the check valve 9 is opened.

[0066] The check valve body 91 is radially provided with a second channel 912, one end of the second channel 912 is connected to the first channel 911, a stop pin 93 is penetrated through the second channel 912, and an elastic component 96 is connected between the stop pin 93 and the check valve body 91, and the elastic component 96 is used to drive the stop pin 93 to move in the direction of the first channel 911; a stop groove 941 adapted to the stop pin 93 is provided on the outer peripheral wall of the valve stem 94, and the stop groove 941 is located at the end of the valve stem 94 away from the valve cover 95.

[0067] The check valve 9 is provided with a valve stem 94 stop pin 93 and an elastic component 96, and a stop groove 941 is provided on the valve stem 94. After the pump is used for a long time, the check ring 92 provided at the check valve body 91 will become larger due to impact wear, and the valve cover 95 will be reduced in size, causing the valve cover 95 to move too downward and hit the main shaft 41, damaging the impeller 61 and the submersible motor 1. When the valve stem 94 moves downward to the set position, the stop pin 93 enters the stop groove 941 through the elastic component 96 to limit the valve stem 94 and the valve cover 95 from moving downward and hitting the main shaft 41, thereby improving the safe operation and service life of the deep well submersible pump. Specifically, the elastic component 96 can be composed of a spring and a push rod.

[0068] The specific installation process of the check valve 9 is as follows: the valve stem 94 is installed in the connecting hole on the valve cover 95 through the thread set at its lower end, the screw is passed through the lower end of the connecting hole and installed in the screw hole set on the valve stem 94 to further fix the valve cover 95 and the valve stem 94 together, the stud passes upward from the lower end of the connecting hole, and is connected to the valve cover 95 through the thread of the surrounding wall of the connecting hole, and then the screw is tightened, and the anti-return ring is installed in the anti-return groove at the lower end of the connecting hole and cooperates with the stud to ensure that the screw will not loosen and withdraw, ensuring that the connection between the valve cover 95 and the valve stem 94 is firm and stable. Install the valve stem 94 in the first channel 911 set on the check valve body 91, so that the hub end face set on the valve cover 95 cooperates with the hole cover positioning face set on the check valve body 91, install the stop pin 93 in the second channel 912 set on the check valve body 91 to cooperate with the valve stem 94, install the spring in the second channel 912 set on the check valve body 91 to cooperate with the stop pin 93, install the push rod in the second channel 912 set on the check valve body 91 to cooperate with the spring, install the stud in the screw hole set on the check valve body 91 to cooperate with the push rod, install the check ring in the outer end of the screw hole set on the check valve body 91 to cooperate with the stud, ensure that the stud will not loosen and withdraw to cause the push rod, spring and stop pin 93 to fall off; install the check ring 92 on the last-stage guide vane 711, and after the check valve body 91 is placed on the check ring 92, the installation groove at the water inlet of the check valve body 91 cooperates with the check ring 92 and is fixed on the last-stage guide vane 711.

[0069] In the prior art, the main shaft 41 of the pump, the power output end 11 of the submersible motor 1 and the coupling 3 are all fixed and tightly matched, and the shaft end of the main shaft 41 is directly matched and contacted with the power output end 11 of the submersible motor 1, while the coupling 3 only plays a connecting role; during the operation of the pump, the weight of the rotor components of the pump and the water thrust will completely act on the small end face of the power output end 11 of the submersible motor 1 through the main table, and the axial force it bears will be very large and easy to be damaged. In addition, when the pump is started, due to the external liquid pressure of the submersible pump chamber 100 and the upward flow of the liquid in the pump chamber 100, the rotor components of the pump such as the impeller 61 will move upward instantly. Because the main shaft 41 of the pump, the power output end 11 of the submersible motor 1 and the coupling 3 are all fixed and tightly matched, when the pump rotor components move upward instantly, they will drive the power output end 11 of the submersible motor 1 to move upward together and damage the motor, which reduces the safe and reliable operation and service life of the deep well submersible pump, increases the operation, maintenance and repair costs of the pump, and is not conducive to the needs of modern society and industrial development.

[0070] Therefore, Fig.19As shown, in some improved schemes of the present application, the coupling 3 has an upper opening for installing the main shaft 41 and a lower opening for installing the power output end 11 of the submersible motor 1, the inner peripheral wall of the coupling 3 is provided with a first step portion 31 arranged toward the upper opening and a second step portion 32 arranged toward the lower opening, the first step portion 31 and the second step portion 32 are arranged at intervals up and down, the main shaft 41 is transmission-connected to the coupling 3 through a flat key, and the lower end of the main shaft 41 abuts against the first step portion 31, the power output end 11 of the submersible motor 1 is transmission-connected to the coupling 3 through a flat key, and the power output end 11 of the submersible motor 1 is clearance-matched with the second step portion 32. Specifically, the axial clearance between the power output end 11 and the second step portion 32 is Nmm, where 0.1≤N≤0.5.

[0071] The flat key has high positioning accuracy and can be used for shafts at high speed or subjected to impact or variable loads, but it is difficult to fix in the axial direction; in the present application, the coupling 3 and the main shaft 41 can be further locked radially by bolts, so that the lower end of the main shaft 41 fits on the first step portion 31 of the coupling 3 for axial positioning, which can limit the vertical axial displacement between the coupling 3 and the main shaft 41. The power output end 11 of the submersible motor 1 is not locked and fixed with the coupling 3, and there is a gap between its upper end and the second step portion 32 of the coupling 3 for axial positioning, ensuring that when the impeller 61 and other rotor components of the submersible pump move upward at the moment of starting, the coupling 3 can move upward freely without driving the power output end 11 of the submersible motor 1 to move upward and damage the motor, thereby improving the safe operation and service life of the deep well submersible pump.

[0072] The specific assembly process of the submersible motor 1, the coupling frame 2 and the coupling 3 of the present invention is as follows: the sand-proof ring 27 is installed in the bottom surface of the sand-proof cover 26, the sand-proof ring 27 and the sand-proof cover 26 are sleeved on the coupling 3, the coupling 3 is passed through the coupling frame 2 and then installed on the power output end 11 of the submersible motor 1, so that the lower end of the coupling 3 is matched with the axial positioning surface of the power output end 11, and there is an axial gap N between the upper end of the power output end 11 and the second step 32 of the coupling 3, and the size of the axial gap N is 0.1-0.5 mm. The suction section 5 is matched with the coupling frame 2 and fixed together, the sand-proof cover 26 and the sand-proof ring 27 are moved downward to match the mounting groove and the coupling 3 provided on the coupling frame 2, and the sand-proof cover 26 is fixed to the coupling frame 2 after the screws are sunk into the screw countersunk holes provided on the sand-proof cover 26. The sealing ring is installed on the sealing stop provided on the connecting frame 2 and matched with the cable 12. The cable sealing cover is matched with the cable 12 and fixed on the connecting frame 2 to press the sealing ring. Another sealing ring is installed on the probe wire sealing cover. The probe wire sealing cover passes through the probe wire and matches and fixes with the second wire outlet hole provided on the connecting frame. The installation window door is installed on the installation window 293 provided on the connecting frame. The filter is installed on the suction section 5. The solenoid valve 811 is installed on the sand flushing pipe 81. The sand flushing pipe 81 is respectively installed on the liquid outlet hole provided on the first-stage guide vane and the liquid inlet hole provided on the connecting frame 2. The solenoid valve 811 and the temperature detection probe are electrically connected to the external power supply control cabinet of the submersible motor 1 through the probe wire to form a high-safety and high-reliability deep well submersible pump.

[0073] Since in the prior art, there is no protective sleeve on the outside of the main shaft 41 of the pump, and the keyway 63 of the impeller 61 of the pump is mostly an axial through-type structure, when the rotor component of the pump rotates at high speed, the impurities such as mud and sand in the medium will quickly wear the main shaft 41, reducing the safety of the main shaft 41; plus there is no through-through between the protective sleeve and the keyway 63 of the impeller 61, the mud and sand in the medium will enter the keyway 63 under the action of the pressurized liquid flow, and due to the operating condition fluctuation of the pump outlet pipe network pressure, the operation of the rotor component will experience a fluctuating transient stall, and the flat key and the keyway 63 of the impeller 61 and the keyway 63 of the main shaft 41 will experience intermittent wear, and this wear will be more serious when the pump is started and stopped, which will reduce the reliability of the pump operation. In addition, the impeller 61 of the submersible pump is mostly fixed by a series of concentrated nuts or a cone sleeve, which is easy to fall off. When the series of concentrated nuts are used for fixing, the axial force generated by each impeller 61 will also be concentrated on the nut on the main shaft 41, and the main shaft 41 here is subjected to a large axial compressive stress, which is easy to bend, deform and damage.

[0074] Therefore, Figure 7As shown, in some improved schemes of the present application, it also includes a first sleeve 42, a first bearing sleeve 43 and a plurality of sleeve assemblies 44. The first sleeve 42 and the plurality of sleeve assemblies 44 are sequentially sleeved on the main shaft 41 from bottom to top. The lower end of the first sleeve 42 is connected to the upper end of the coupling 3, the upper end of the first sleeve 42 is connected to the sleeve assembly 44, the first bearing sleeve 43 is sleeved on the first sleeve 42, and the first bearing sleeve 43 is connected to the suction section 5; the sleeve assembly 44 includes a connecting The connecting bearing sleeve 444, and the elastic ring 441, the interstage sleeve 442 and the connecting sleeve 443 are arranged in sequence from bottom to top, the connecting bearing sleeve 444 is sleeved on the connecting sleeve 443, and each impeller 61 is arranged one by one between the interstage sleeve 442 and the interpole sleeve in each sleeve assembly 44, the lower end of the impeller 61 abuts against the interstage sleeve 442, the upper end of the impeller 61 is connected to the connecting sleeve 443, and each connecting bearing sleeve 444 is connected one by one to each guide vane 71.

[0075] Specifically, the impeller 61 is independently positioned and fixed on the main shaft 41 through the interstage sleeve 442 and the connecting sleeve 443 instead of being centrally fixed in series. The impeller 61 is fixedly connected to the connecting sleeve 443, so that the axial force generated by each impeller 61 can be dispersed on the main shaft 41, and the impeller 61 is firmly fixed on the main shaft 41 and will not fall off, thereby reducing the concentrated axial compressive stress on the main shaft 41; the sleeve assembly 44 completely wraps the main shaft 41, so that the main shaft 41 is completely isolated from the pumping medium, ensuring that impurities in the medium do not wear the main shaft 41, thereby improving the safe operation and service life of the deep well submersible pump.

[0076] Specifically, the interstage sleeve 442 is axially fixed to the impeller 61 through the tension elastic action of the elastic ring 441, so that the interstage sleeve 442 and the end surface of the impeller 61 are seamlessly matched, and the interstage sleeve 442 and the connecting sleeve 443 are seamlessly matched through the elastic ring 441, ensuring that the main shaft 41 is completely separated from the pumping medium. The sleeve assembly 44 may also include a positioning ring, the inner peripheral wall of the connecting sleeve 443 is provided with a first positioning groove, and the outer peripheral wall of the main shaft 41 is correspondingly provided with a second positioning groove, and the positioning ring is set at the second positioning groove on the main shaft 41 and is located in the first positioning groove, which can further fix the axial position of the connecting sleeve 443 on the main shaft 41.

[0077] The specific installation process of the sleeve assembly is as follows: the positioning ring is sleeved on the main shaft 41 and matched with the connecting sleeve 443, the interstage sleeve 442 is sleeved on the main shaft 41 and matched with the elastic ring 441, the impeller 61 is sleeved on the main shaft 41 and matched with the interstage sleeve 442 and the front ring 72, the positioning ring is installed in the second positioning groove provided on the main shaft 41 and matched with the impeller 61, the connecting sleeve 443 is sleeved on the main shaft 41 and matched with the impeller 61, so that the first positioning groove provided on the connecting sleeve 443 is The positioning groove cooperates with the positioning ring, and the connecting sleeve 443, the impeller 61 and the positioning ring are independently fixed on the main shaft 41 after the screw is sunk into the screw countersunk hole set on the connecting sleeve 443. The interstage sleeve 442 is axially fixed to the impeller 61 through the tension elasticity of the elastic ring 441, so that the interstage sleeve 442 and the end face of the impeller 61 are seamlessly matched, and the interstage sleeve 442 and the connecting sleeve 443 are seamlessly matched through the elastic ring 441, ensuring that the main shaft 41 is completely separated from the pumping medium. After the guide vane 71 is put over the main shaft 41, the rear ring 73 is matched with the impeller 61, and the connecting bearing sleeve 444 is matched with the connecting sleeve 443, the guide vane 71 and the adjacent guide vane 71 are connected and fixed together. The number of impellers 61 and guide vanes 71 installed can be multiple.

[0078] Specifically, Fig. 20 As shown, a cavity groove 64 and a key groove 63 for mounting with the main shaft 41 are axially opened on the impeller 61, and the lower end of the key groove 63 is connected with the cavity groove 64, so that the key groove 63 and the shaft hole of the impeller 61 are a non-through structure.

[0079] When the connecting sleeve 443 is radially locked on the main shaft 41 by bolts, the fixation is not firm enough and it is easy to fall off, causing the pump to run unsafely. In addition, the bolts are exposed outside the connecting sleeve 443. When the rotor of the pump rotates at high speed, the exposed bolts will cause friction with the liquid ring, which is easy to be damaged. The friction will reduce the running efficiency of the pump and not save energy. Fig.16 As shown, in some improved schemes of the present application, the sleeve assembly 44 also includes a bolt member 445, a connecting platform 446 is provided on the outer peripheral wall of the connecting sleeve 443, the lower end of the connecting platform 446 is flush with the lower end of the connecting sleeve 443, and a threaded countersunk hole 447 is provided at the upper end of the connecting platform 446, and the bolt member 445 passes through the threaded countersunk hole 447 from top to bottom and is fixedly connected to the impeller 61.

[0080] The connecting sleeve 443 is fixedly connected to the impeller 61 by means of bolts 445, and the bolts 445 are sunk in the connecting platform 446 to avoid the liquid ring friction caused by the bolts 445 being exposed when the submersible pump is running due to the high-speed rotation of the rotor components. In addition, the structure of the first sleeve 42 can be provided with the same connecting platform 446 as the connecting sleeve 443, so as to be connected to the coupling 3 by means of the sunken bolts.

[0081] When the submersible pump is used in a very deep water level, at the moment of starting the pump, due to the external liquid pressure of the submersible pump chamber 100 and the upward flow of the liquid in the chamber, the pump's impeller 61 and other rotor parts will move upward instantly. The excessive upward displacement of the rotor parts will cause the impeller 61 to collide and rub against the mouth ring of the guide vane 71, thereby causing damage to the impeller 61 and the guide vane 71, reducing the safe and reliable operation and service life of the deep well submersible pump. Therefore, if Figure 6 As shown, in some improved schemes of the present application, a front ring 72 and a rear ring 73 are also included, and both the front ring 72 and the rear ring 73 are installed on the guide vane 71, and the front ring 72 is arranged in cooperation with the bottom end of the guide vane, and the rear ring 73 is arranged in cooperation with the top end of the guide vane; the guide vane 71 connected to the check valve 9 is defined as a last-stage guide vane 711, and the guide vane arranged in the last-stage guide vane 711 is defined as a last-stage guide vane, and the last-stage guide vane has an abutment plane 612 arranged opposite to the rear ring 73 on the last-stage guide vane in the axial direction, and a thrust ring 62 is arranged on the abutment plane 612, and an axial thrust clearance Lmm is provided between the thrust ring 62 and the rear ring 73, satisfying: 0.5≤L≤1.5.

[0082] The last-stage impeller 611 is provided with a thrust ring 62. When the submersible pump is used in a very deep water level, the impeller 61 and other rotor parts will move upwards due to the liquid pressure outside the pump chamber 100 and the upward flow of the liquid inside the pump chamber 100 at the moment of starting the pump. When the last-stage impeller 611 chases the thrust ring 62, the thrust ring 62 can effectively prevent the impeller 61 from excessively moving upwards and causing collision and friction of various parts on the main shaft 41, thereby avoiding damage to the impeller 61, the guide vane 71 and the main shaft 41, and improving the safe operation and service life of the deep well submersible pump.

[0083] When the pump is running, the front cover and rear cover of each impeller 61 will cause the liquid in the pump chamber 100 to rotate at high speed due to the high-speed rotation of the rotor components. The high-speed rotation of the liquid will cause annular friction on the inner wall of the pump chamber 100. The impurities such as mud and sand in the medium will quickly wear the impellers 61, guide vanes 71, connecting frame 2, suction section 5, and submersible motor 1 under the drive of the rotating liquid. At the same time, the annular friction of the rotating liquid will consume a lot of motor power and cause vibration of the submersible pump. Therefore, if Fig.11 and Fig.12 As shown, in some improved schemes of the present application, a plurality of anti-rotation ribs 74 extending in the axial direction and radial direction of the main shaft 41 are provided in the pump chamber 100, and each anti-rotation rib 74 is respectively connected to any one of the suction section 5, the first-stage guide vane 71, the middle-stage guide vane 71, and the final-stage guide vane 711. After the guide vane 71 and the suction section 5 are provided with corresponding anti-rotation ribs 74, the front cover plate and the rear cover plate of each impeller 61 can be effectively prevented from causing the liquid ring friction caused by the high-speed rotation of the rotor parts during the operation of the pump. The suction section 5 and the coupling frame 2 are also provided with corresponding anti-rotation ribs 74, which can effectively prevent the liquid ring friction in the sand collecting ring groove 52 and the coupling frame.

[0084] Since the residual axial force generated by the impeller 61 during the operation of the pump will act on the submersible motor 1 through the main shaft 41, the residual axial force of the pump running for a long time will damage the thrust bearing of the submersible motor 1. Figure 4 As shown, in some improved schemes of the present application, a balancing disc 45 is provided at one end of the main shaft 41 close to the check valve 9, and a balancing chamber 451 is provided at the side of the balancing disc 45 away from the check valve 9. When the pump is running, the axial force generated by the impeller 61 will still have residual axial force after being balanced by the balancing hole 65 provided on the impeller 61. The residual axial force acts on the submersible motor 1 through the main shaft 41. When the pump is running for a long time, the residual axial force will damage the thrust bearing of the submersible motor 1. The balancing chamber 451 provided on the main shaft 41 for balancing the axial force can completely balance the residual axial force, thereby improving the safe operation and service life of the deep well submersible pump.

[0085] In summary, the embodiment of the present invention provides a deep well submersible pump, which has the functions of collecting silt, isolating silt and automatically flushing and discharging silt, and can completely eliminate silt and other impurities in the pumping medium from entering the submersible motor 1 and damaging the motor; the valve cover 95 of the check valve 9 has the most unfavorable axial downward movement limiting function, which can fully guarantee the safe operation of the pump rotor components and the submersible motor 1; it has the ability to completely balance the residual axial force to ensure that the rotor components and the submersible motor 1 are not subjected to any axial force and operate safely; it has a thrust limiting function for the axial upward movement of the rotor components at the moment of pump startup to ensure the safe operation of the pump at startup; it has the function of independent positioning and fixing of the impeller 61, which can reduce the concentrated axial compressive stress of the main shaft 41; it has the ability to completely isolate the pumping medium from the main shaft 41 to ensure that impurities in the medium do not wear the main shaft 41; it has the characteristics of the connecting sleeve 443 and the impeller 61 being independently fixed and shared, thus saving the production cost of the pump; at the same time, the sleeve connecting and fixing bolt 445 has the ability to prevent the ring friction between the pumped medium and the pumped medium, thereby improving the operation efficiency and service life of the pump; it has the anti-rotation ribs 74 to prevent the liquid ring friction caused by the front cover plate and the rear cover plate of each impeller 61, and the anti-rotation ribs 74 have the ability to prevent the liquid ring friction in the sand collecting ring groove 52 and the coupling; it has the ability of the main shaft 41 of the rotor component to move upward independently at the moment of pump startup, thereby ensuring that the power output end 11 of the submersible motor 1 will not be driven upward by the pump rotor component, thereby ensuring the safe operation of the submersible motor 1, and at the same time, it can ensure that the weight of the rotor component and the water thrust completely act on the axial end face of the power output end 11 of the submersible motor 1, thereby reducing the operation, maintenance and repair costs of the pump.

[0086] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A deep well submersible pump, characterized in that: include: Submersible motor, coupling, coupling frame, main shaft, suction section, multiple impellers, multiple guide vanes, sand flushing pipe and check valve; The submersible motor has an upwardly extending power output end, the power output end is coaxially connected with the main shaft through a coupling, the connecting frame is sleeved on the coupling and installed on the upper end of the submersible motor, a water inlet is provided on the peripheral wall of the suction section, the connecting frame, the suction section, the guide vane and the check valve are fixedly connected in sequence from bottom to top, and the top of the connecting frame, the inner peripheral wall of the suction section, the inner peripheral wall of the guide vane and the bottom end of the check valve are surrounded to form a pump chamber; each of the impellers is sleeved on the main shaft in sequence and is located in the pump chamber, and the impeller is fixedly connected to the main shaft; A sand collecting ring groove is provided at the bottom end of the suction section, a sand leakage hole is provided at the top end of the connecting frame, a sand collecting chamber is provided in the connecting frame, the sand collecting ring groove is communicated with the sand collecting chamber through the sand leakage hole, a hole cover is provided in the sand collecting chamber which is slidably connected to the connecting frame, and the hole cover can open and close the sand leakage hole by sliding up and down, a liquid inlet hole and a sand outlet hole which are communicated with the sand collecting chamber are also provided on the peripheral wall of the connecting frame, the liquid inlet hole and the sand outlet hole are arranged opposite to each other, a first end of the sand flushing pipe is communicated with the liquid inlet hole, and a second end thereof is communicated with the bottom of the pump chamber, and a solenoid valve is connected in series on the sand flushing pipe; Also includes: sand cover and sand ring; The top of the coupling frame is provided with a sand collecting groove arranged around the coupling, the sand-proof cover is passed through the coupling and fixedly installed in the sand collecting groove, the sand leakage hole is arranged in the sand collecting groove and is located around the sand-proof cover, part of the outer peripheral wall of the coupling, the top of the sand-proof cover, the sand collecting groove, and part of the inner peripheral wall of the suction section are surrounded to form the sand collecting ring groove, and the top of the sand-proof cover is gradually inclined downward along its radial direction outward; The check valve comprises a check valve body, a check ring, a stop pin, a valve stem and a valve cover, the lower end of the check valve body is connected to the guide vane, the check ring is arranged at one end of the check valve body connected to the guide vane, the check valve body is provided with a first channel extending along its central axis, the valve stem is passed through the first channel and is slidably connected to the check valve body, the valve cover is fixedly connected to the lower end of the valve stem and can move up and down relative to the check ring; when the valve cover moves to abut against the check ring, the check valve is closed, and when the valve cover moves away from the check ring, the check valve is opened; The check valve body is radially provided with a second channel, one end of which is connected to the first channel, the stop pin is inserted into the second channel, and an elastic component is connected between the stop pin and the check valve body, and the elastic component is used to drive the stop pin to move in the direction of the first channel; a stop groove matched with the stop pin is provided on the outer peripheral wall of the valve stem, and the stop groove is located at the end of the valve stem away from the valve cover.

2. The deep well submersible pump according to claim 1, characterized in that: A closed cavity is formed between the inner wall of the connecting frame, part of the outer wall of the coupling, and part of the end of the submersible motor. A first wire inlet hole and a first wire outlet hole connected to the closed cavity are opened on the connecting frame. The first wire inlet hole is located at the bottom of the closed cavity. The submersible motor has a cable. The cable is sequentially passed through the first wire inlet hole and the first wire outlet hole from the top of the submersible motor and is sealed and connected to the closed cavity.

3. The deep well submersible pump according to claim 1, characterized in that: The coupling has an upper opening for installing the main shaft and a lower opening for installing the power output end of the submersible motor. The inner peripheral wall of the coupling is provided with a first step portion arranged toward the upper opening and a second step portion arranged toward the lower opening. The first step portion and the second step portion are arranged with an upper and lower interval. The main shaft is transmission-connected to the coupling through a flat key, and the lower end of the main shaft abuts against the first step portion. The power output end of the submersible motor is transmission-connected to the coupling through a flat key, and the power output end of the submersible motor and the second step portion are clearance-fitted.

4. The deep well submersible pump according to claim 1, characterized in that: It also includes a first sleeve, a first bearing sleeve and a plurality of sleeve assemblies, the first sleeve and the plurality of sleeve assemblies are sequentially sleeved on the main shaft from bottom to top, the lower end of the first sleeve is connected to the upper end of the coupling, the upper end of the first sleeve is connected to the sleeve assembly, the first bearing sleeve is sleeved on the first sleeve, and the first bearing sleeve is connected to the suction section; the sleeve assembly includes a connecting bearing sleeve, and an elastic ring, an interstage sleeve and a connecting sleeve sequentially arranged from bottom to top, the connecting bearing sleeve is sleeved on the connecting sleeve, each of the impellers is correspondingly arranged between the interstage sleeve and the connecting sleeve in each of the sleeve assemblies, the lower end of the impeller abuts against the interstage sleeve, the upper end of the impeller is connected to the connecting sleeve, and each of the connecting bearing sleeves is correspondingly connected to each of the guide vanes.

5. The deep well submersible pump according to claim 4, characterized in that: The shaft sleeve assembly also includes a bolt member, a connecting platform is provided on the outer peripheral wall of the connecting shaft sleeve, the lower end of the connecting platform is flush with the lower end of the connecting shaft sleeve, and a threaded countersunk hole is opened at the upper end of the connecting platform. The bolt member passes through the threaded countersunk hole from top to bottom and is fixedly connected to the impeller.

6. The deep well submersible pump according to claim 1, characterized in that: A plurality of anti-rotation ribs extending in the axial direction and radial direction of the main shaft are arranged in the pump cavity, and each of the anti-rotation ribs is respectively connected to any one of the suction section and the guide vanes.

7. The deep well submersible pump according to claim 1, characterized in that: A balancing disc is arranged at one end of the main shaft close to the check valve, and a balancing chamber is arranged at one side of the balancing disc away from the check valve.

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