Energy-saving deep-well submersible pump self-circulation cooling system

Abstract

The application discloses an energy-saving self-circulation cooling system of a deep-well submersible pump, and belongs to the technical field of submersible pump cooling circulation, which comprises a pump cylinder, a plurality of guide vanes are arranged axially in the pump cylinder, an impeller is arranged coaxially and rotatably in the guide vanes, an impeller shaft is rotatably connected in the pump cylinder, and each impeller is fixed to the impeller shaft; a motor cylinder is coaxially arranged at one end of the pump cylinder, a water inlet section is connected between the motor cylinder and the pump cylinder, and a mesh cover is arranged on the water inlet section; a coil winding and a rotor are coaxially arranged in the motor cylinder, one end of the rotor is connected to the impeller shaft; a first cooling channel is formed in the inner wall of the side wall of the motor cylinder, and a second cooling channel is arranged on the inner wall of the motor cylinder; a liquid guiding unit is further arranged at the end of the motor cylinder; the flow circulation of the cooling medium in the flow cavity and the cooling medium in the first cooling channel is realized, the efficient cooling of the submersible pump under high-power working is further ensured, no additional liquid pumping power is needed, and finally, energy-saving cooling is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of submersible pump cooling circulation, and particularly relates to a self-circulation cooling system of an energy-saving deep-well submersible pump. BACKGROUND

[0002] The deep-well submersible pump is mainly used for pumping water or other liquid from the deep underground. Since the pump body and the motor need to be continuously and rapidly operated, a large amount of heat is generated. If the heat dissipation is poor, the motor winding will be overheated, the lubrication will be invalid, and the insulating material will be aged. The traditional forced cooling circulation design needs additional energy consumption for pumping the cooling liquid. Some cooling structures use the natural convection or the weak pressure difference driving mode for cooling. Although the energy consumption can be reduced, the cooling medium almost does not flow or has a very low flow rate during the motor starting stage or the low-speed operation, and the heat dissipation effect is very limited. Moreover, the larger the motor power is, the more limited the cooling effect is, so that the motor cannot be continuously operated at a high power.

[0003] Therefore, it is necessary to provide a self-circulation cooling system of an energy-saving deep-well submersible pump to solve the problems in the background. SUMMARY

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a self-circulation cooling system of an energy-saving deep-well submersible pump, which comprises a pump barrel, a plurality of guide vanes are arranged axially in the pump barrel, an impeller is arranged coaxially in the guide vanes, an impeller shaft is rotatably connected in the pump barrel, and each impeller is fixed to the impeller shaft.

[0005] One end of the pump barrel is coaxially provided with a motor barrel, a water inlet section is connected between the motor barrel and the pump barrel, and a mesh cover is arranged on the water inlet section.

[0006] A coil winding and a rotor are coaxially arranged in the motor barrel, one end of the rotor is connected to the impeller shaft.

[0007] A first cooling channel is arranged in the inner wall of the motor barrel, and a second cooling channel is arranged in the inner wall of the motor barrel.

[0008] A liquid guiding unit is further arranged at the end of the motor barrel.

[0009] Further, as a preferred, the first cooling channel and the second cooling channel are filled with cooling medium.

[0010] Further, as a preferred, the first cooling channel is a plurality of circumferentially distributed channels, and each first cooling channel is arranged obliquely along the axial direction of the motor barrel.

[0011] The inner wall of the motor barrel is provided with a side opening between adjacent first cooling channels, and a plurality of side openings are alternately arranged at opposite positions in the axial direction of the inner wall of the motor barrel.

[0012] Further, as preferred, the second cooling channel is circumferentially distributed and arranged corresponding to the first cooling channel, and is linearly arranged along the axial direction of the motor cylinder.

[0013] The flow cavity is arranged outside the second cooling channel in the motor cylinder.

[0014] Further, as preferred, the first cooling channel is fixed with positioning plates at both ends, and a connecting shaft is connected between the positioning plates, the connecting shaft is arranged in parallel with the first cooling channel, and a plurality of liquid guide plates are uniformly arranged on the connecting shaft.

[0015] A guide shaft is slidingly connected to the positioning plate, the connecting shaft is fixed with the guide shaft, a side joint plate is rotatably connected to the positioning plate, and a support rod is hingedly connected to the other end of the guide shaft and connected with the side joint plate.

[0016] Further, as preferred, the side joint plate is fixed with a positioning shaft which is vertically distributed with the positioning plate, a shaft block is coaxially fixed on the positioning shaft, and a limiting spring is connected between the shaft block and the inner wall of the motor cylinder.

[0017] Further, as preferred, the liquid guide unit comprises a first liquid guide base, a first liquid guide wheel is rotatably connected in the first liquid guide base, the first liquid guide wheel is fixed on the same shaft with the rotor, a plurality of liquid inlet holes are arranged on one end surface of the first liquid guide base, and the liquid inlet holes are communicated with the flow cavity in the motor cylinder.

[0018] A plurality of liquid discharge channels are arranged on the other side of the first liquid guide base, and a plurality of communication channels are arranged on the side wall of the motor cylinder at the second cooling channel, the liquid discharge channels are sealingly communicated with the communication channels.

[0019] A second liquid guide base is coaxially fixed in the motor cylinder, a second liquid guide wheel is rotatably connected in the second liquid guide base, a liquid feeding channel corresponding to the second cooling channel is arranged in the second liquid guide base, the liquid feeding channel is communicated with the second cooling channel, and a plurality of liquid outflow channels are arranged on the second liquid guide base.

[0020] Further, as preferred, a first liquid blocking ring is arranged in the liquid discharge channel of the first liquid guide base, the first liquid blocking ring is slidingly connected with the liquid discharge channel through a supporting spring, a side through hole is arranged on the side wall of the first liquid blocking ring, a bypass hole is arranged on the side wall of the liquid discharge channel, and the side through hole of the first liquid blocking ring is slidingly connected with the bypass hole.

[0021] A sealing shaft is further fixed in the first liquid guide base, and the sealing shaft is slidingly and sealingly connected with the end of the first liquid blocking ring.

[0022] Further, as preferred, one end of each of the second cooling channels is fixed with a cut-off ring two, and a sealing shaft is also fixed in the second cooling channel and in sliding sealing cooperation with the cut-off ring two;

[0023] An inner flow hole is formed in the first cooling channel, and the inner flow hole is in sliding abutment with the side through hole on the cut-off ring two.

[0024] Further, as preferred, the cut-off ring one and the cut-off ring two are synchronously adjusted in sliding, and the cut-off ring one and the cut-off ring two are separated from the sealing shaft at the end of the cut-off ring one and the cut-off ring two under the action of the supporting spring force, at this time, the side through holes on the cut-off ring one and the cut-off ring two are respectively in sliding misalignment with the bypass hole and the inner flow hole.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] In the present application, a plurality of first cooling channels are formed in the annular wall of the motor cylinder, and the plurality of first cooling channels are in structure with each other through the axially staggered side through holes, thereby forming a serpentine flow circulation cooling channel structure, so that the cooling medium can fully flow along the first cooling channel, realizing uniform cooling and heat dissipation of the motor cylinder. Among them, a connecting shaft is arranged in each first cooling channel, and a plurality of liquid guide plates are distributed on the connecting shaft. The shaft block on the positioning shaft can fully utilize the radial vibration generated during the operation of the motor cylinder to realize the reciprocating axial displacement of the connecting shaft by controlling the deflection of the side segment plate, so that the liquid guide plate can fully discharge the cooling medium in the first cooling channel into the adjacent first cooling channel through the side through hole, realizing the circulation of the cooling medium. It not only ensures the uniform cooling effect, but also realizes the liquid circulation without additional energy consumption.

[0027] The first liquid guide wheel and the second liquid guide wheel arranged in the liquid guide unit can guide the cooling medium in the flow chamber of the motor cylinder to the first liquid guide seat during rotation of the rotor, and then enter each second cooling channel through the drainage channel in the first liquid guide seat, and then circulate and discharge to the flow chamber through the outflow channel of the second liquid guide seat, thereby realizing the circulation of the cooling medium in the flow chamber and the second cooling channel, and ensuring efficient cooling and heat dissipation. Among them, the faster the rotor speed, the greater the flow pressure of the cooling medium in the first liquid guide seat, and the cut-off ring one and the cut-off ring two can be connected with the side through hole and the bypass hole and the inner flow hole under the hydraulic pressure of the cooling medium. At this time, the first liquid guide seat and the second liquid guide seat can form a flow circulation with the first cooling channel, thereby realizing the flow circulation of the cooling medium in the flow chamber and the cooling medium in the first cooling channel, further ensuring efficient cooling and heat dissipation of the submersible pump under high power without additional pumping power, and finally realizing energy-saving cooling. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0029] Figure 2 is a sectional view of the overall structure of the present application;

[0030] Figure 3 is a structural schematic view of the first cooling channel in the present application;

[0031] Figure 4 is a cross-sectional structural schematic view of the first cooling channel and the second cooling channel in the present application;

[0032] Figure 5 is a structural schematic view of the connecting shaft in the present application;

[0033] Figure 6 is a structural schematic view of Figure 5 is an enlarged schematic view of the structure at A in the present application;

[0034] Figure 7 is a structural schematic view of the liquid guiding unit in the present application;

[0035] Figure 8 is a structural schematic view of Figure 7 is an enlarged schematic view of the structure at B in the present application;

[0036] Figure 9 is a structural schematic view of the second liquid guiding seat in the present application;

[0037] In the figure: 1, pump cylinder; 11, guide vane; 12, impeller shaft; 13, water inlet section; 14, mesh cover; 2, motor cylinder; 21, coil winding; 22, rotor; 3, first cooling channel; 31, side opening; 32, inner flow hole; 33, positioning plate; 34, connecting shaft; 35, liquid guiding plate; 36, guide shaft; 37, side section plate; 38, positioning shaft; 39, shaft block; 4, second cooling channel; 41, communication channel; 5, liquid guiding unit; 51, first liquid guiding seat; 52, first liquid guiding wheel; 53, liquid inlet hole; 54, flow discharge channel; 55, second liquid guiding seat; 56, second liquid guiding wheel; 57, liquid delivery flow channel; 6, cut-off ring one; 61, side through hole; 62, bypass hole; 63, cut-off ring two. DETAILED DESCRIPTION

[0038] Please refer to Figures 1-9 In the embodiment of the present application, an energy-saving type deep-well submersible pump self-circulation cooling system comprises a pump cylinder 1, a plurality of guide vanes 11 are arranged axially in the pump cylinder 1, an impeller is arranged coaxially rotatably in the guide vane 11, an impeller shaft 12 is rotatably connected in the pump cylinder 1, and each impeller is fixed with the impeller shaft 12. The impeller adopts a centrifugal plastic structure, the number of blades is 6, and the shape of the blade can be a twisted arc-shaped blade to improve the fluid dynamics performance. The central hub part of the impeller is designed with a special reinforcing structure or is hollow designed to reduce the weight while ensuring the strength.

[0039] The impeller blade material is selected from a plastic material PPO plastic raw material (polyphenylene oxide), such as a high-strength, corrosion-resistant engineering plastic. The material has good chemical corrosion resistance and can work stably in a pH range of 3-11. At the same time, it has high mechanical strength, with a tensile strength of more than 90 MPa and a bending strength of more than 140 MPa, which is sufficient to withstand the centrifugal force during the operation of the deep-well pump.

[0040] One end of the pump cylinder 1 is coaxially provided with a motor cylinder 2, and a water inlet section 13 is connected between the motor cylinder 2 and the pump cylinder 1. The water inlet section 13 is provided with a mesh cover 14.

[0041] The coil winding 21 and the rotor 22 are coaxially arranged in the motor cylinder 2, and one end of the rotor 22 is connected to the impeller shaft 12. The rotor 22 can drive the impeller shaft 12 to rotate under the driving rotation of the electromagnetic force, thereby realizing the rotation of the impeller in the submersible pump.

[0042] The inner wall of the motor cylinder 2 is provided with a second cooling channel 4, and the first cooling channel 3 is arranged in the annular wall of the motor cylinder 2. Therefore, during the operation of the submersible pump in the deep well, the well water in the deep well can provide environmental cooling, realizing the cooling of the first cooling channel 3. The second cooling channel 4 is arranged in the motor cylinder 2, and the second cooling channel 4 mainly utilizes the first cooling channel 3 to cool the heat generated by the coil winding 21 and the rotor 22 in the motor cylinder 2, thereby fully utilizing the low-temperature well water in the deep well for cooling work.

[0043] The end of the motor cylinder 2 is also provided with a liquid guiding unit 5.

[0044] In this embodiment, the first cooling channel 3 and the second cooling channel 4 are filled with a cooling medium, which can be a water-based coolant with a high heat capacity (about 4.18 J / g·℃).

[0045] As a preferred embodiment, the first cooling channel 3 is circumferentially distributed, and each first cooling channel 3 is inclined along the axial direction of the motor cylinder 2, and the included angle between the first cooling channel 3 and the axis of the motor cylinder 2 is about 6°. In this way, on the one hand, the overall length of the first cooling channel 3 can be extended to cover the entire motor cylinder 2 as much as possible. On the other hand, by inclining the first cooling channel 3, the cooling medium inlet and outlet channels in the first cooling channel 3 are not in the same axial direction, which can effectively utilize the vibration of the motor cylinder 2 during operation to promote the flow of the cooling liquid in the first cooling channel 3 to the outlet channel;

[0046] The inner wall of the motor cylinder 2 is provided with side openings 31 between adjacent first cooling channels 3, and a plurality of side openings 31 are alternately arranged at opposite positions in the axial direction of the inner wall of the motor cylinder 2, so that the plurality of first cooling channels 3 can form a serpentine channel, and the cooling medium in the first cooling channel 3 can circulate and flow along the first cooling channel 3, thereby achieving uniform cooling of the entire motor cylinder 2.

[0047] In this embodiment, the second cooling channel 4 is circumferentially distributed and corresponds to the first cooling channel 3, and the second cooling channel 4 is linearly arranged along the axial direction of the motor cylinder 2.

[0048] The second cooling channel 4 is provided with a flow cavity outside the second cooling channel 4, wherein the end of the motor cylinder 2 is provided with a shaft seal for preventing leakage of the cooling liquid from the end of the motor cylinder 2, and the overall length of the second cooling channel 4 is the same as the length of the first cooling channel 3, and the cross-sectional span of the second cooling channel 4 is not less than the cross-sectional span of the first cooling channel 3, so that the cooling medium in the second cooling channel 4 exchanges heat with the cooling medium in the first cooling channel 3.

[0049] In this embodiment, the first cooling channel 3 is fixed at both ends of the inside of the first cooling channel 3, and the connecting shaft 34 is connected between the positioning plates 33, the connecting shaft 34 is parallel to the first cooling channel 3, and a plurality of liquid guide plates 35 are uniformly arranged on the connecting shaft 34, and the liquid guide plates 35 can guide the cooling liquid in the first cooling channel 3 to one side in the axial sliding of the connecting shaft 34.

[0050] The positioning plate 33 is slidably connected with a guide shaft 36, the connecting shaft 34 is fixed with the guide shaft 36, and the positioning plate 33 is rotatably connected with a side segment plate 37, the other end of the guide shaft 36 is hinged with a support rod, and the support rod is connected with the side segment plate 37, it should be noted that the sliding directions of the guide shafts 36 on the two positioning plates 33 are consistent, so that the two ends of the connecting shaft 34 can be displaced synchronously with the sliding of the guide shaft 36.

[0051] In this embodiment, the side segment plate 37 is fixed with a positioning shaft 38 which is perpendicular to the positioning plate 33, the positioning shaft 38 is coaxially fixed with a shaft block 39, and the shaft block 39 is connected with a limiting spring (not shown in the figure) between the inner wall of the motor cylinder 2, wherein, since the first cooling channel 3 is inclined, the positioning shaft 38 on the positioning plate 33 faces different radial directions, so that in the working of the submersible pump, the vibration of the motor cylinder 2 can be fully utilized to make the shaft block 39 shake, the shaft block 39 can push the side segment plate 37 to deflect through the positioning shaft 38, at this time the side segment plate 37 can push the guide shaft 36 along its axial direction through the support rod, thereby realizing the reciprocating flow guiding effect of the liquid guide plates 35 on the connecting shaft 34, without the need for additional pump liquid equipment.

[0052] As a preferred embodiment, the liquid guide unit 5 comprises a first liquid guide base 51, a first liquid guide wheel 52 is rotatably connected in the first liquid guide base 51, the first liquid guide wheel 52 is fixed on the same shaft as the rotor 22, a plurality of liquid inlet holes 53 are formed on one side end face of the first liquid guide base 51, the liquid inlet holes 53 are communicated with the flow cavity in the motor cylinder 2, and the first liquid guide wheel 52 can guide the cooling medium in the flow cavity to the first liquid guide base 51 through the liquid inlet holes 53 during the rotation of the rotor 22.

[0053] A plurality of liquid outlet channels 54 are formed on the other side of the first liquid guide base 51, and a plurality of communication channels 41 are formed in the side wall of the motor cylinder 2 at the second cooling channel 4, the liquid outlet channels 54 are in sealed communication with the communication channels 41, and the cooling medium entering the first liquid guide base 51 can flow into the communication channels 41 through the liquid outlet channels 54, and then into each second cooling channel 4.

[0054] The motor cylinder 2 further coaxially fixedly has a second liquid guide base 55, the second liquid guide base 55 rotatably connects a second liquid guide wheel 56, the second liquid guide base 55 is provided with a liquid sending channel 57 corresponding to the second cooling channel 4, the liquid sending channel 57 is communicated with the second cooling channel 4, and the second liquid guide base 55 is further provided with a plurality of outflow channels (not shown in the figure), wherein the second liquid guide wheel 56 in the second liquid guide base 55 can guide the cooling medium in each second cooling channel 4 to the second liquid guide base 55 through the liquid sending channel 57 during the rotation of the rotor 22, and the cooling medium can finally enter the flow cavity through the outflow channel, thereby realizing the circulation of the cooling medium between the second cooling channel 4 and the flow cavity.

[0055] In this embodiment, the liquid outlet channel 54 of the first liquid guide base 51 is provided with a flow blocking ring one 6, the flow blocking ring one 6 is slidably connected with the liquid outlet channel 54 through a supporting spring, a side through hole 61 is formed on the side wall of the flow blocking ring one 6, a bypass hole 62 is formed on the side wall of the liquid outlet channel 54, and the side through hole 61 of the flow blocking ring one 6 is slidably connected with the bypass hole 62.

[0056] The first liquid guide base 51 further fixedly has a sealing shaft, the sealing shaft is slidably and sealingly connected with the end of the flow blocking ring one 6, and the sealing shaft can block the end of the flow blocking ring one 6 during the sliding of the flow blocking ring one 6, at this time, the corresponding side through hole 61 and the bypass hole 62 are slidably connected, so that the cooling medium in the first liquid guide base 51 can enter the first cooling channel 3.

[0057] In this embodiment, the second cooling channel 4 is fixedly provided with a flow blocking ring two 63 at one end close to the second liquid guide base 55, and the second cooling channel 4 is further fixedly provided with a sealing shaft slidably and sealingly connected with the flow blocking ring two 63.

[0058] The first cooling channel 3 is provided with an inner flow hole 32, and the inner flow hole 32 is in sliding abutment with the side through hole 61 of the second intercepting ring 63.

[0059] In the embodiment, the first intercepting ring 6 and the second intercepting ring 63 are synchronously adjusted in sliding mode (wherein the first intercepting ring 6 and the second intercepting ring 63 can also be fixed by a connecting rod to ensure synchronous sliding displacement), and the first intercepting ring 6 and the second intercepting ring 63 are separated from the end of the sealing shaft by the elastic force of the supporting spring without external force, at this time, the side through hole 61 of the first intercepting ring 6 and the second intercepting ring 63 are respectively in sliding misalignment with the bypass hole 62 and the inner flow hole 32.

[0060] Specifically, when the submersible pump is in low-power operation, the flow pressure of the cooling medium in the first liquid guide seat 51 is less than the elastic force of the supporting spring, therefore, the side through hole 61 of the first intercepting ring 6 and the second intercepting ring 63 are respectively in sliding misalignment with the bypass hole 62 and the inner flow hole 32, at this time, the cooling medium in the flow cavity of the motor cylinder 2 can form a flow circulation through the first liquid guide seat 51, the second liquid guide seat 55 and the second cooling channel 4, so that the cooling medium in the motor cylinder 2 can flow fully; when the submersible pump is in high-power operation, the rotating speed of the rotor 22 is fast, the flow pressure of the cooling medium in the first liquid guide seat 51 is greater than the elastic force of the supporting spring, at this time, the first intercepting ring 6 and the second intercepting ring 63 can be hydraulically pushed to contact and block the end of the sealing shaft, and the side through hole 61 of the first intercepting ring 6 and the second intercepting ring 63 are respectively in sliding abutment with the bypass hole 62 and the inner flow hole 32, the cooling medium in the flow cavity of the motor cylinder 2 can form a flow circulation through the first liquid guide seat 51, the second liquid guide seat 55 and the first cooling channel 3, realizing the flow exchange between the first cooling channel 3 and the cooling medium in the flow cavity, so as to achieve maximum cooling and ensure the cooling of the submersible pump in high-power operation.

[0061] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An energy-saving self-circulation cooling system for a deep-well submersible pump, characterized in that, It include pump cylinder (1), its inside axial direction is provided with multiple guide vane (11), the guide vane (11) is provided with impeller coaxially, the pump cylinder (1) is rotatably connected with impeller shaft (12), each impeller is fixed with impeller shaft (12); The one end of the pump cylinder (1) is coaxially installed with motor cylinder (2), the motor cylinder (2) is connected with the water inlet section (13) between the pump cylinder (1), the water inlet section (13) is equipped with the mesh cover (14); The motor cylinder (2) is coaxially installed with coil winding (21) and rotor (22) in, the one end of the rotor (22) is connected with the impeller shaft (12); The first cooling channel (3) is established in the inside of the side wall of the motor cylinder (2), and the second cooling channel (4) is established in the inner wall of the motor cylinder (2); The end of the motor cylinder (2) is also provided with a liquid guide unit (5); The liquid guide unit (5) includes a first liquid guide seat (51), a first liquid guide wheel (52) is connected to the inside of the first liquid guide seat (51), the first liquid guide wheel (52) is fixed with the rotor (22) on the same shaft, a plurality of liquid inlet holes (53) are formed on one side of the first liquid guide seat (51), the liquid inlet holes (53) are communicated with the flow cavity in the motor cylinder (2); A plurality of drainage channels (54) are formed on the other side of the first liquid guide seat (51), the side wall of the motor cylinder (2) is provided with a communication channel (41) at the second cooling channel (4), the drainage channels (54) are sealed with the communication channel (41); The motor cylinder (2) is also coaxially fixed with a second liquid guide seat (55), a second liquid guide wheel (56) is rotatably connected to the second liquid guide seat (55), a liquid sending channel (57) corresponding to the second cooling channel (4) is formed in the second liquid guide seat (55), the liquid sending channel (57) is communicated with the second cooling channel (4), a plurality of outflow channels are distributed on the second liquid guide seat (55); A first flow cutoff ring (6) is arranged in the drainage channel (54) of the first liquid guide seat (51), the first flow cutoff ring (6) is slidably connected with the drainage channel (54) through a supporting spring, a side through hole (61) is formed on the side wall of the first flow cutoff ring (6), a bypass hole (62) is formed on the side wall of the drainage channel (54), the side through hole (61) of the first flow cutoff ring (6) is slidably connected with the bypass hole (62); A sealing shaft is fixed in the first liquid guide seat (51), the sealing shaft is slidably connected with the end of the first flow cutoff ring (6).

2. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 1, characterized in that, The first cooling channel (3) and the second cooling channel (4) are filled with cooling medium.

3. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 1, characterized in that, The first cooling channel (3) is a plurality of circumferentially distributed, each of the first cooling channel (3) is inclined along the axial direction of the motor cylinder (2); The inner wall of the motor cylinder (2) is provided with a side opening (31) between adjacent first cooling channels (3), a plurality of side openings (31) are alternately arranged on the opposite positions of the inner wall of the motor cylinder (2) in the axial direction.

4. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 3, characterized in that, The second cooling channel (4) is circumferentially distributed and corresponds to the first cooling channel (3), and is linearly arranged along the axial direction of the motor cylinder (2); The second cooling channel (4) is arranged outside the flow cavity in the motor cylinder (2).

5. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 1, characterized in that, The first cooling channel (3) is fixed with positioning plates (33) at both ends, and the positioning plates (33) are connected with a connecting shaft (34) arranged in parallel with the first cooling channel (3), and the connecting shaft (34) is uniformly arranged with a plurality of liquid guide plates (35). The positioning plates (33) are slidably connected with guide shafts (36), the connecting shaft (34) is fixed with the guide shafts (36), and the positioning plates (33) are rotatably connected with side segment plates (37), and the other end of the guide shaft (36) is hingedly connected with a support rod and connected with the side segment plate (37) through the support rod.

6. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 5, characterized in that, The side segment plate (37) is fixed with a positioning shaft (38) distributed perpendicularly to the positioning plate (33), the positioning shaft (38) is coaxially fixed with an axle block (39), and the axle block (39) is connected with a limiting spring between the inner wall of the motor cylinder (2).

7. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 1, characterized in that, Each second cooling channel (4) is fixed with a second flow cutoff ring (63) at one end close to the second liquid guide base (55), and is further fixed with a sealing shaft in sliding sealing cooperation with the second flow cutoff ring (63); The first cooling channel (3) is provided with an inner flow hole (32), and the inner flow hole (32) is in sliding butt joint with the side through hole (61) on the second flow cutoff ring (63).

8. The self-circulation cooling system of an energy-saving deep-well submersible pump according to claim 7, characterized in that, The first flow cutoff ring (6) and the second flow cutoff ring (63) are synchronously adjusted in sliding, and the first flow cutoff ring (6) and the second flow cutoff ring (63) are separated from the end of the sealing shaft under the action of the supporting spring force without external force, at this time, the side through hole (61) on the first flow cutoff ring (6) and the second flow cutoff ring (63) is respectively in sliding misalignment with the bypass hole (62) and the inner flow hole (32).

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