Self-circulation cooling system of energy-saving deep well submersible pump

Abstract

The invention discloses a self-circulation cooling system of an energy-saving deep well submersible pump, and belongs to the technical field of submersible pump cooling circulation, the self-circulation cooling system comprises a pump cylinder, a plurality of guide vanes are axially arranged in the pump cylinder, impellers are coaxially and rotatably arranged in the guide vanes, an impeller shaft rod is rotatably connected in the pump cylinder, and each impeller is fixed with the impeller shaft rod; a motor cylinder is coaxially mounted at one end of the pump cylinder, a water inlet section is connected between the motor cylinder and the pump cylinder, and a mesh enclosure sleeves the water inlet section; a coil winding and a rotor are coaxially mounted in the motor cylinder; one end of the rotor is connected with the impeller shaft rod; a first cooling channel is formed in the side wall of the motor cylinder, and a second cooling channel is formed in the inner wall of the motor cylinder; a liquid guide unit is further arranged at the end part of the motor cylinder; flow circulation of a cooling medium in the flow cavity and a cooling medium in the first cooling channel is achieved, efficient cooling of the submersible pump under high-power work is further guaranteed, extra pump fluid power is not needed, and finally energy saving and cooling are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible pump cooling circulation, in particular to a self-circulating cooling system of an energy-saving deep-well submersible pump. Background Art

[0002] Deep well submersible pumps are mainly used to extract water or other liquids from deep underground. Since the pump body and motor need to run continuously at high speed, a large amount of heat will be generated. If the heat dissipation is poor, it will lead to problems such as overheating of the motor winding, lubrication failure, and aging of the insulation material. The traditional forced cooling cycle design requires additional energy consumption for pumping coolant, and some cooling structures use natural convection or weak pressure difference drive for cooling. Although it can achieve energy-free effect, during the motor startup phase or low-speed operation, the cooling medium hardly flows or the flow rate is extremely low, and the heat dissipation effect is very limited. Moreover, as the motor power increases, the maximum cooling effect it can achieve is generally general, resulting in the motor being unable to continue high-power operation.

[0003] Therefore, it is necessary to provide a self-circulating cooling system for an energy-saving deep well submersible pump to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a self-circulating cooling system for an energy-saving deep-well submersible pump, comprising a pump barrel, a plurality of guide vanes being axially arranged inside the pump barrel, an impeller being coaxially arranged inside the guide vane, an impeller shaft being rotatably connected inside the pump barrel, and each impeller being fixed to the impeller shaft;

[0005] A motor cylinder is coaxially mounted on 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 provided on the outer cover of the water inlet section;

[0006] The motor cylinder is coaxially mounted with a coil winding and a rotor, and one end of the rotor is connected to the impeller shaft;

[0007] A first cooling channel is provided inside the side wall of the motor barrel, and a second cooling channel is provided on the inner wall of the motor barrel;

[0008] A liquid guiding unit is also provided at the end of the motor barrel.

[0009] Furthermore, preferably, both the first cooling channel and the second cooling channel are filled with cooling medium.

[0010] Furthermore, preferably, the first cooling channels are multiple and circumferentially distributed, and each of the first cooling channels is arranged obliquely along the axial direction of the motor barrel;

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

[0012] Furthermore, preferably, the second cooling channels are multiple and distributed circumferentially, and are arranged corresponding to the first cooling channels, and the second cooling channels are arranged along the axial straight line of the motor barrel;

[0013] The interior of the motor barrel is located outside the second cooling channel and is configured as a flow cavity.

[0014] Further, preferably, positioning plates are fixed at both ends of the first cooling channel, a connecting shaft is connected between the positioning plates, the connecting shaft is arranged parallel to the first cooling channel, and a plurality of liquid guide plates are evenly arranged on the connecting shaft;

[0015] The positioning plates are all slidably connected with guide shafts, the connecting shafts are fixed to the guide shafts, the positioning plates are rotatably connected with side section plates, the other ends of the guide shafts are hinged with support rods, and are connected to the side section plates through the support rods.

[0016] Furthermore, preferably, the side section plate is fixed with a positioning shaft vertically distributed with respect to 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 barrel.

[0017] Further, preferably, the liquid guide unit includes a first liquid guide seat, an internal rotating shaft of which is connected to a first liquid guide wheel, the first liquid guide wheel is fixed coaxially with the rotor, and a plurality of liquid inlet holes are formed on one end surface of the first liquid guide seat, and the liquid inlet holes are connected to the flow cavity in the motor barrel;

[0018] A plurality of drainage channels are provided on the other side of the first liquid guide seat, and a connecting channel is provided on the side wall of the motor barrel at the second cooling channel, and the drainage channels are sealed and connected to the connecting channel;

[0019] A second liquid guide seat is coaxially fixed in the motor barrel, and a second liquid guide wheel is rotatably connected in the second liquid guide seat. A liquid delivery channel corresponding to the second cooling channel is opened in the second liquid guide seat, and the liquid delivery channel is connected to the second cooling channel. A plurality of external flow channels are also distributed on the second liquid guide seat.

[0020] Furthermore, preferably, a shutoff ring 1 is provided in the drainage channel of the first liquid guide seat, the shutoff ring 1 is slidably connected to the drainage channel via a support spring, a side through hole is provided on the side wall of the shutoff ring 1, a bypass hole is provided on the side wall of the drainage channel, and the side through hole of the shutoff ring 1 is slidably docked with the bypass hole;

[0021] A sealing shaft is also fixed in the first liquid guiding seat, and the sealing shaft is in sliding and sealing cooperation with the end portion of the first intercepting ring.

[0022] Furthermore, preferably, a second intercepting ring is fixed at one end of each of the second cooling channels close to the second liquid guide seat, and a sealing shaft is also fixed in the second cooling channel for sliding and sealing cooperation with the second intercepting ring;

[0023] An inner flow hole is provided in the first cooling channel, and the inner flow hole is slidably connected to the side through hole on the second intercepting ring.

[0024] Furthermore, preferably, the cut-off ring 1 and the cut-off ring 2 are slidably adjusted synchronously, and the cut-off ring 1 and the cut-off ring 2 are separated from the sealing shaft and the ends of the cut-off ring 1 and the cut-off ring 2 by the elastic force of the supporting spring in the absence of external force. At this time, the side through holes on the cut-off ring 1 and the cut-off ring 2 are slidably staggered with the bypass hole and the inner flow hole respectively.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present invention, a plurality of first cooling channels are opened in the annular wall of the motor barrel, and the plurality of first cooling channels are interconnected through axially staggered side openings, thereby forming a cooling channel structure with a serpentine circulation, so that the cooling medium can fully flow along the first cooling channel, thereby achieving uniform cooling and heat dissipation of the motor barrel. A connecting shaft is provided 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 by the operation of the motor barrel to achieve reciprocating axial displacement of the connecting shaft by controlling the deflection of the side node 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 opening, thereby achieving circulation of the cooling medium, which not only ensures uniform cooling effect, but also can achieve liquid circulation without additional energy consumption.

[0027] The first liquid guide wheel and the second liquid guide wheel provided in the liquid guide unit can guide the cooling medium in the flow cavity of the motor barrel to the first liquid guide seat during the rotation of the rotor, and then enter the second cooling channels through the discharge channel in the first liquid guide seat, and circulate and discharge to the flow cavity through the external flow channel of the second liquid guide seat, thereby realizing the circulation of the cooling medium in the flow cavity and the second cooling channel, ensuring efficient cooling and cooling; wherein, as the rotor speed is faster, the flow liquid pressure of the cooling medium in the first liquid guide seat is greater, and the cut-off ring 1 and the cut-off ring 2 can, under the hydraulic push of the cooling medium, connect the side through hole with the bypass hole and the inner flow hole respectively. 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 cavity and the cooling medium in the first cooling channel, further ensuring the efficient cooling and cooling of the submersible pump under high power operation, without the need for additional pump hydraulic power, and ultimately achieving energy saving and cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0030] Figure 3 Schematic diagram of the structure of the first cooling channel in the present invention;

[0031] Figure 4 Schematic diagram of the cross-sectional structure of the first cooling channel and the second cooling channel in the present invention;

[0032] Figure 5 Schematic diagram of the structure of the connecting shaft in the present invention;

[0033] Figure 6 for Figure 5 A schematic diagram of the structure at center A;

[0034] Figure 7 Schematic diagram of the structure of the liquid guide unit in the present invention;

[0035] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point B in the middle;

[0036] Figure 9 Schematic diagram of the structure of the second liquid guide seat in the present invention;

[0037] In the figure: 1. Pump barrel; 11. Guide vane; 12. Impeller shaft; 13. Water inlet section; 14. Mesh cover; 2. Motor barrel; 21. Coil winding; 22. Rotor; 3. First cooling channel; 31. Side through port; 32. Inner flow hole; 33. Positioning plate; 34. Connecting shaft; 35. Liquid guide plate; 36. Guide shaft; 37. Side section plate; 38. Positioning shaft; 39. Shaft block; 4. Second cooling channel; 41. Connecting channel; 5. Liquid guide unit; 51. First liquid guide seat; 52. First liquid guide wheel; 53. Liquid inlet hole; 54. Discharge channel; 55. Second liquid guide seat; 56. Second liquid guide wheel; 57. Liquid delivery channel; 6. Intercept ring 1; 61. Side through hole; 62. Bypass hole; 63. Intercept ring 2 DETAILED DESCRIPTION

[0038] See also Figures 1-9 In an embodiment of the present invention, a self-circulating cooling system for an energy-saving deep-well submersible pump includes a pump barrel 1 having a plurality of guide vanes 11 axially disposed therein. Impellers are coaxially disposed within the guide vanes 11. An impeller shaft 12 is rotatably connected to the pump barrel 1, and each impeller is fixed to the impeller shaft 12. The impeller adopts a centrifugal plastic structure, has six blades, and can be twisted arc-shaped to improve fluid dynamics. The central hub of the impeller is designed with a special reinforcement structure or a hollow design to reduce weight while ensuring strength.

[0039] The impeller blades are made of PPO (polyphenylene ether), a high-strength, corrosion-resistant engineering plastic. This material offers excellent chemical resistance and stable operation within a pH range of 3-11. It also possesses high mechanical strength, with a tensile strength exceeding 90 MPa and a flexural strength exceeding 140 MPa, sufficient to withstand the centrifugal forces of deep-well pump operation.

[0040] A motor cylinder 2 is coaxially mounted on one end of the pump cylinder 1. A water inlet section 13 is connected between the motor cylinder 2 and the pump cylinder 1. A mesh cover 14 is provided on the outer cover of the water inlet section 13.

[0041] The motor barrel 2 is coaxially mounted with a coil winding 21 and a rotor 22, one end of which is connected to the impeller shaft 12; the rotor 22 can drive the impeller shaft 12 to rotate under electromagnetic force, thereby realizing the rotation of the impeller in the submersible pump;

[0042] A first cooling channel 3 is provided inside the side wall of the motor barrel 2, and a second cooling channel 4 is provided on the inner wall of the motor barrel 2; wherein, the first cooling channel 3 is provided in the annular wall of the motor barrel 2, so when the submersible pump is working in a deep well, the well water in the deep well can provide environmental cooling to achieve cooling in the first cooling channel 3, and the second cooling channel 4 is provided in the motor barrel 2. 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 barrel 2, thereby making full use of the low-temperature well water in the deep well for cooling.

[0043] A liquid guiding unit 5 is also provided at the end of the motor barrel 2 .

[0044] In this embodiment, the first cooling channel 3 and the second cooling channel 4 are both filled with a cooling medium. The cooling medium may be a water-based coolant having a relatively high heat capacity (about 4.18 J / g·°C).

[0045] As a preferred embodiment, the first cooling channels 3 are multiple and distributed circumferentially. Each of the first cooling channels 3 is arranged obliquely along the axial direction of the motor barrel 2, and the angle between the first cooling channel 3 and the axis of the motor barrel 2 is about 6°. This arrangement can extend the overall length of the first cooling channel 3 so that the first cooling channel 3 can cover the entire motor barrel 2 as much as possible. On the other hand, by arranging the first cooling channel 3 obliquely, the cooling medium inlet channel and the discharge channel in the first cooling channel 3 are in non-uniform axial directions, which can effectively utilize the vibration of the motor barrel 2 during operation to promote the coolant in the first cooling channel 3 to flow to the discharge channel.

[0046] The inner wall of the motor barrel 2 is provided with side openings 31 between adjacent first cooling channels 3, and multiple side openings 31 are alternately arranged at axially opposite positions on the inner wall of the motor barrel 2 so that a serpentine channel can be formed between the multiple first cooling channels 3, so that the cooling medium in the first cooling channel 3 can circulate along the first cooling channel 3, thereby achieving uniform cooling of the motor barrel 2 as a whole.

[0047] In this embodiment, the second cooling channels 4 are multiple and distributed circumferentially, and are arranged corresponding to the first cooling channels 3. The second cooling channels 4 are arranged along the axial straight line of the motor barrel 2.

[0048] The inside of the motor barrel 2 is set as a flow cavity outside the second cooling channel 4, wherein the ends of the motor barrel 2 are provided with shaft sealing seats to prevent the coolant from leaking from the ends of the motor barrel 2. The overall length of the second cooling channel 4 is consistent with the length of the first cooling channel 3, and its cross-sectional span 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 can exchange heat with the cooling medium in the first cooling channel 3.

[0049] In this embodiment, positioning plates 33 are fixed at both ends of the first cooling channel 3. A connecting shaft 34 is connected between the positioning plates 33. The connecting shaft 34 is arranged parallel to the first cooling channel 3. A plurality of liquid guide plates 35 are evenly arranged on the connecting shaft 34. The liquid guide plates 35 can guide the coolant in the first cooling channel 3 to one side when the connecting shaft 34 slides axially.

[0050] The positioning plates 33 are all slidably connected with guide shafts 36, the connecting shafts 34 are fixed to the guide shafts 36, and the positioning plates 33 are rotatably connected with side section plates 37. The other end of the guide shafts 36 is hinged with a support rod and connected to the side section plates 37 through the support rod. 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 shafts 36.

[0051] In this embodiment, the side node plate 37 is fixed with a positioning shaft 38 distributed perpendicularly to the positioning plate 33, and a shaft block 39 is coaxially fixed on the positioning shaft 38. A limiting spring (not shown in the figure) is connected between the shaft block 39 and the inner wall of the motor barrel 2. Among them, since the first cooling channel 3 is tilted, the positioning shaft 38 on the positioning plate 33 faces different radial directions. Therefore, during the operation of the submersible pump, it can make full use of the vibration of the motor barrel 2 to make each shaft block 39 shake, and the shaft block 39 can push the side node plate 37 to deflect through the positioning shaft 38. At this time, the side node plate 37 can use the support rod to push the guide shaft 36 along its axial direction, thereby realizing the reciprocating diversion effect of the liquid guide plate 35 on the connecting shaft 34, without the need for additional pumping equipment.

[0052] As a preferred embodiment, the liquid guide unit 5 includes a first liquid guide seat 51, whose internal rotating shaft is connected to a first liquid guide wheel 52. The first liquid guide wheel 52 is fixed coaxially with the rotor 22. A plurality of liquid inlet holes 53 are formed on one end surface of the first liquid guide seat 51. The liquid inlet holes 53 are connected to the flow cavity in the motor barrel 2. The first liquid guide wheel 52 can guide the cooling medium in the flow cavity into the first liquid guide seat 51 through the liquid inlet holes 53 as the rotor 22 rotates.

[0053] A plurality of drainage channels 54 are provided on the other side of the first liquid guide seat 51. A connecting channel 41 is provided on the side wall of the motor barrel 2 at the second cooling channel 4. The drainage channels 54 are sealed and connected to the connecting channel 41. The cooling medium entering the first liquid guide seat 51 can flow into the connecting channel 41 through the drainage channels 54 and then into each second cooling channel 4.

[0054] A second liquid guide seat 55 is also coaxially fixed in the motor barrel 2, and a second liquid guide wheel 56 is rotatably connected in the second liquid guide seat 55. A liquid delivery channel 57 corresponding to the second cooling channel 4 is opened in the second liquid guide seat 55, and the liquid delivery channel 57 is connected to the second cooling channel 4. A plurality of external flow channels (not shown in the figure) are also distributed on the second liquid guide seat 55, wherein the second liquid guide wheel 56 in the second liquid guide seat 55 can guide the cooling medium in each second cooling channel 4 to the second liquid guide seat 55 through the liquid delivery channel 57 as the rotor 22 rotates, and the cooling medium can eventually enter the flow cavity through the external flow channel, thereby realizing the circulation of the cooling medium between the second cooling channel 4 and the flow cavity.

[0055] In this embodiment, a shutoff ring 6 is provided in the drainage channel 54 of the first liquid guide seat 51. The shutoff ring 6 is slidably connected to the drainage channel 54 via a support spring. A side through hole 61 is provided on the side wall of the shutoff ring 6. A bypass hole 62 is provided on the side wall of the drainage channel 54. The side through hole 61 of the shutoff ring 6 is slidably connected to the bypass hole 62.

[0056] A sealing shaft is also fixed in the first liquid guide seat 51, and the sealing shaft is in sliding and sealing cooperation with the end of the intercepting ring 6. The sealing shaft can block the end of the intercepting ring 6 when the intercepting ring 6 slides. At this time, the corresponding side through hole 61 and the bypass hole 62 are slidably docked, so that the cooling medium in the first liquid guide seat 51 can enter the first cooling channel 3.

[0057] In this embodiment, a second shutoff ring 63 is fixed to one end of each second cooling channel 4 near the second liquid guide seat 55, and a sealing shaft is also fixed to the second cooling channel 4 to slide and seal with the second shutoff ring 63;

[0058] An inner flow hole 32 is formed in the first cooling channel 3 , and the inner flow hole 32 is slidably connected to the side through hole 61 on the second intercepting ring 63 .

[0059] In this embodiment, the intercepting ring 1 6 and the intercepting ring 2 63 are slidably adjusted synchronously (wherein, the intercepting ring 1 6 and the intercepting ring 2 63 may also be fixed by a connecting rod to ensure that they can slide synchronously), and the intercepting ring 1 6 and the intercepting ring 2 63 are separated from the sealing shaft and the ends of the intercepting ring 1 6 and the intercepting ring 2 63 by the elastic force of the supporting spring in the absence of external force. At this time, the side through holes 61 on the intercepting ring 1 6 and the intercepting ring 2 63 are slidably staggered with the bypass hole 62 and the inner flow hole 32 respectively;

[0060] Specifically, when the submersible pump is working at low power, 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 holes 61 on the cut-off ring 1 6 and the cut-off ring 2 63 are respectively slidably staggered with the bypass hole 62 and the inner flow hole 32. At this time, the cooling medium in the flow cavity in the motor barrel 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 barrel 2 can flow fully. When the submersible pump is working at high power, the rotation speed of the rotor 22 is faster, and the cooling medium in the first liquid guide seat 51 The flow pressure is greater than the elastic force of the supporting spring. At this time, the cut-off ring 1 6 and the cut-off ring 2 63 can be hydraulically pushed so that their ends are in contact with the sealing shaft for sealing, and the side through holes 61 on the cut-off ring 1 6 and the cut-off ring 2 63 are slidably docked with the bypass hole 62 and the inner flow hole 32 respectively. The cooling medium in the flow cavity in the motor barrel 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 cooling during high-power operation of the submersible pump.

[0061] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A self-circulating cooling system for an energy-saving deep well submersible pump, characterized in that: It comprises a pump barrel (1), a plurality of guide vanes (11) are axially arranged inside the pump barrel, an impeller is coaxially rotatably arranged inside the guide vane (11), an impeller shaft (12) is rotatably connected inside the pump barrel (1), and each impeller is fixed to the impeller shaft (12); A motor cylinder (2) is coaxially mounted on one end of the pump cylinder (1), a water inlet section (13) is connected between the motor cylinder (2) and the pump cylinder (1), and a mesh cover (14) is provided on the outer cover of the water inlet section (13); A coil winding (21) and a rotor (22) are coaxially mounted in the motor barrel (2), and one end of the rotor (22) is connected to the impeller shaft (12); A first cooling channel (3) is provided inside the side wall of the motor barrel (2), and a second cooling channel (4) is provided on the inner wall of the motor barrel (2); A liquid guiding unit (5) is also provided at the end of the motor cylinder (2).

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

3. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 1 is characterized in that: The first cooling channels (3) are multiple and distributed circumferentially, and each of the first cooling channels (3) is arranged obliquely along the axial direction of the motor barrel (2); The inner wall of the motor barrel (2) is provided with side openings (31) between adjacent first cooling channels (3), and the plurality of side openings (31) are alternately arranged at axially opposite positions on the inner wall of the motor barrel (2).

4. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 3 is characterized in that: The second cooling channels (4) are multiple and distributed around the circumference and are arranged corresponding to the first cooling channels (3). The second cooling channels (4) are arranged along the axial straight line of the motor barrel (2); The interior of the motor barrel (2) and the exterior of the second cooling channel (4) are provided as a flow cavity.

5. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 1 is characterized in that: Positioning plates (33) are fixed at both ends of the first cooling channel (3), a connecting shaft (34) is connected between the positioning plates (33), the connecting shaft (34) is arranged parallel to the first cooling channel (3), and a plurality of liquid guide plates (35) are evenly arranged on the connecting shaft (34); The positioning plates (33) are all slidably connected to guide shafts (36), the connecting shafts (34) are fixed to the guide shafts (36), the positioning plates (33) are rotatably connected to side section plates (37), and the other ends of the guide shafts (36) are hinged to support rods and connected to the side section plates (37) via the support rods.

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

7. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 1 is characterized in that: The liquid guide unit (5) comprises a first liquid guide seat (51), the internal rotating shaft of which is connected to a first liquid guide wheel (52), the first liquid guide wheel (52) being fixed coaxially with the rotor (22), and a plurality of liquid inlet holes (53) being formed on one end surface of the first liquid guide seat (51), the liquid inlet holes (53) being connected to the flow cavity in the motor barrel (2); A plurality of drainage channels (54) are provided on the other side of the first liquid guide seat (51), and a connecting channel (41) is provided on the side wall of the motor barrel (2) at the second cooling channel (4), and the drainage channels (54) are sealed and connected to the connecting channel (41); A second liquid guide seat (55) is coaxially fixed in the motor barrel (2), a second liquid guide wheel (56) is rotatably connected in the second liquid guide seat (55), a liquid delivery channel (57) corresponding to the second cooling channel (4) is opened in the second liquid guide seat (55), the liquid delivery channel (57) is connected to the second cooling channel (4), and a plurality of external flow channels are distributed on the second liquid guide seat (55).

8. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 7, characterized in that: A shutoff ring (6) is provided in the discharge channel (54) of the first liquid guide seat (51), and the shutoff ring (6) is slidably connected to the discharge channel (54) via a support spring. A side through hole (61) is provided on the side wall of the shutoff ring (6), and a bypass hole (62) is provided on the side wall of the discharge channel (54). The side through hole (61) of the shutoff ring (6) is slidably connected to the bypass hole (62); A sealing shaft is also fixed in the first liquid guide seat (51), and the sealing shaft is in sliding sealing cooperation with the end of the intercepting ring (6).

9. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 8, characterized in that: A second shutoff ring (63) is fixed at one end of each second cooling channel (4) close to the second liquid guide seat (55), and a sealing shaft that is in sliding sealing cooperation with the second shutoff ring (63) is also fixed in the second cooling channel (4); An inner flow hole (32) is provided in the first cooling channel (3), and the inner flow hole (32) is slidably connected to the side through hole (61) on the second intercepting ring (63).

10. The self-circulating cooling system of an energy-saving deep well submersible pump according to claim 9, characterized in that: The intercepting ring 1 (6) and the intercepting ring 2 (63) are slidably adjusted synchronously, and the intercepting ring 1 (6) and the intercepting ring 2 (63) are separated from the sealing shaft and the ends of the intercepting ring 1 (6) and the intercepting ring 2 (63) by the elastic force of the supporting spring in the absence of external force. At this time, the side through holes (61) on the intercepting ring 1 (6) and the intercepting ring 2 (63) are slidably staggered with the bypass hole (62) and the inner flow hole (32) respectively.

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