High-power submersible cross-flow pump

Abstract

The application discloses a high-power submersible tubular pump, which comprises the following components: an inner cylinder, a cylinder cavity of which is a sealed cavity; a rotating shaft, which is in rotary cooperation with the inner cylinder and is sealed with the inner cylinder at a contact surface; a rotor assembly, which is arranged in the cylinder cavity of the inner cylinder and is coaxially fixed with the rotating shaft; a stator assembly, which is arranged in the cylinder cavity of the inner cylinder and is in electromagnetic induction cooperation with the rotor assembly so as to drive the rotor assembly and the rotating shaft to rotate; an outer cylinder, two ends of which are communicated with a drainage pipeline, the inner cylinder is coaxially arranged in the outer cylinder, and the outer cylinder and the inner cylinder are fixedly supported through support plates; the support plates are arranged in at least two groups along the axis of the outer cylinder, the outer cylinder, the inner cylinder and the support plates form a sealed cooling cavity, the cooling cavity is communicated with the cylinder cavity of the inner cylinder; and a water pipe, which penetrates through the support plates so as to pass through the cooling cavity of the outer cylinder, and two ends of the water pipe are communicated with external fluid. The application improves the heat dissipation efficiency of the submersible tubular pump matched with the high-power submersible motor, and ensures the stable operation of the submersible tubular pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to a large-power submersible tubular pump. BACKGROUND

[0002] The submersible tubular pump is a horizontal pump type with low lift and large flow, which is widely used in the field of water delivery. The existing submersible tubular pump is matched with a submersible motor with a maximum power of 1600 kW. However, with the increase of demand, the power demand of the submersible motor to be matched will reach 5000 kW. When the submersible tubular pump works under the operating condition of large power, the original motor heat dissipation structure cannot meet the requirements, the motor cannot effectively dissipate heat, and the rotor will expand, which may cause the serious consequence of the friction between the stator and the rotor, directly leading to the shutdown of the submersible tubular pump. Therefore, it is urgent to be solved. SUMMARY

[0003] In order to avoid and overcome the technical problems existing in the prior art, the present application provides a large-power submersible tubular pump. The present application greatly improves the heat dissipation efficiency of the submersible tubular pump matched with a large-power submersible motor, and ensures the stable operation of the submersible tubular pump.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A large-power submersible tubular pump comprises the following components:

[0006] An inner cylinder, the cylinder cavity of which is a sealed cavity;

[0007] A rotating shaft, which is rotationally matched with the inner cylinder and is sealingly arranged at the contact surface of the inner cylinder;

[0008] A rotor assembly, which is arranged in the cylinder cavity of the inner cylinder and is fixed coaxially with the rotating shaft;

[0009] A stator assembly, which is arranged in the cylinder cavity of the inner cylinder and is electromagnetically inductively matched with the rotor assembly to drive the rotor assembly and the rotating shaft to rotate;

[0010] An outer cylinder, both ends of which are communicated with a drainage pipeline, the inner cylinder is coaxially arranged in the outer cylinder, and the outer cylinder and the inner cylinder are fixed and supported by a support plate; the support plate is provided with at least two groups along the axial direction of the outer cylinder, and the outer cylinder, the inner cylinder and the support plates form a sealed cooling cavity, and the cooling cavity is communicated with the cylinder cavity of the inner cylinder;

[0011] A water pipe, which penetrates through each support plate to pass through the cooling cavity of the outer cylinder, and both ends of the water pipe are communicated with the external fluid;

[0012] A driving assembly, which drives the gas in the cylinder cavity of the inner cylinder to enter the cooling cavity and exchange heat with the water pipe;

[0013] The pump body is coaxially arranged with the inner cylinder, and the first oil chamber, the impeller chamber and the second oil chamber are sequentially arranged in the pump body in the axial direction. The two ends of the pump shaft are respectively located in the first oil chamber and the second oil chamber, and the impeller of the impeller chamber is coaxially fixed on the shaft body of the pump shaft. The bearing part is arranged in the first oil chamber and the second oil chamber to form two-point support for the pump shaft, and the shaft body of the pump shaft is coaxially fixed with the rotating shaft after penetrating through the second oil chamber.

[0014] As a further scheme of the present application: the pump shaft and the rotating shaft are connected through a planetary gear reduction box; the bearing part includes a first axial thrust bearing, a first radial bearing, a second axial thrust bearing and a second radial bearing. The first axial thrust bearing is located in the first oil chamber to bear the axial load on one side of the pump shaft, and the second axial thrust bearing is located in the second oil chamber to bear the axial load on the other side of the pump shaft. The first radial bearing is located in the first oil chamber to bear the radial load on one side of the pump shaft, and the second radial bearing is located in the second oil chamber to bear the radial load on the other side of the pump shaft.

[0015] As a further scheme of the present application: the rotor assembly includes a rotor core with a rotor ventilation slot opened in the radial direction, and the stator assembly includes a stator core with a stator ventilation slot opened in the radial direction. The rotor ventilation slot and the stator ventilation slot are positionally corresponding to form a cooling passage for gas flow.

[0016] The inner cylinder is provided with an air inlet and an air outlet on the cylinder wall to enable the gas in the inner cylinder cavity to flow back into the inner cylinder cavity through the air inlet, the cooling cavity and the air outlet in sequence. The inner circle of the rotor core is uniformly arranged with rotor yokes in the circumferential direction and connected with the rotating shaft through the rotor yokes. The driving assembly is a centrifugal fan coaxially fixed on the rotor assembly.

[0017] As a further scheme of the present application: the position of the air inlet corresponds to the position of the stator ventilation slot, and the air outlet has two groups and is arranged at the front and rear ends of the inner cylinder. The centrifugal fan has two groups and is arranged at the front and rear ends of the rotor core to correspond to the position of the stator coil. The fluid discharged from the air outlet passes through the stator coil and then reaches the air inlet through the centrifugal fan. Another part of the fluid passes through the gap between the rotor yokes and the cooling passage in sequence and then reaches the air inlet.

[0018] As a further scheme of the present application: the inner cylinder is provided with a first air guide plate corresponding to the two centrifugal fans in the radial direction. The first air guide plate is located between the end cover of the inner cylinder and the corresponding centrifugal fan. There is a gap between the plate end of the first air guide plate and the rotor yoke, and the corresponding centrifugal fan is installed at the gap.

[0019] As a further scheme of the present application: the outer cylinder and the inner cylinder are coaxially arranged, and the cylinder wall of the inner cylinder is provided with a second air baffle extending to the direction of the cylinder wall of the outer cylinder in the radial direction, and the second air baffle is located between the air inlet and the air outlet.

[0020] As a further scheme of the present application: the support plates are uniformly and circumferentially spaced, and a fluid passage is formed between adjacent support plates for the fluid to pass through the outer cylinder.

[0021] As a further scheme of the present application: the support plate comprises a radial support rib connecting and fixing the outer cylinder and the inner cylinder, and the support plate further comprises a partition plate located at the front and rear ends of the outer cylinder and corresponding to the position of the support rib, and the two partition plates, the two support ribs, the outer cylinder and the inner cylinder are matched with each other to form a cooling cavity; the contact surface between the partition plate and the inner cylinder is sealed by a sealing strip matched with the shape of the partition plate, and the contact surface between the partition plate and the cylinder wall of the outer cylinder is provided with a shock-absorbing pad.

[0022] As a further scheme of the present application: a water collecting tank is further arranged between the inner cylinder and the outer cylinder and located at the bottom of the inner cylinder, and the water collecting tank is positionally avoided by the support plate and is communicated with the cylinder cavity of the inner cylinder.

[0023] As a further scheme of the present application: the outer cylinder is a split half structure, and the power cable and the control cable in the inner cylinder are connected to the terminal box outside the outer cylinder through the terminal pipe.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The support plate is arranged between the inner cylinder and the outer cylinder, and the cooling cavity can be formed by the support plate, the inner cylinder and the outer cylinder, and the cylinder cavity of the inner cylinder is in communication with the cooling cavity, so that when the motor works, the gas in the cylinder cavity of the inner cylinder can enter the cooling cavity and exchange heat with the pipe wall of the water pipe, thereby reducing the temperature of the gas in the cylinder cavity of the inner cylinder, and the support plate can support the inner cylinder and produce a cooling effect on the gas in the inner cylinder through the water pipe, thereby greatly improving the heat dissipation efficiency of the submersible motor used in the submersible tubular pump.

[0026] 2. Two groups of oil chambers are arranged at the front and rear ends of the impeller chamber, and axial thrust bearings and radial bearings are arranged in the two groups of oil chambers, thereby forming two-point support for the pump shaft and the impeller, ensuring that there is always a certain gap between the impeller and the impeller shell, thereby ensuring stable operation of the unit.

[0027] 3. Ventilation grooves are formed on the stator core and the rotor core in the radial direction, and when the centrifugal fan rotates synchronously with the rotor core, wind pressure is generated to cool the stator and the rotor internally, and the rational arrangement of the air inlet and the air outlet enables the gas to circulate along a predetermined track, thereby further improving the heat dissipation efficiency.

[0028] 4、The centrifugal fan of the present application can distribute fluid during operation, so that the gas can generate two-way circulation, one part of which cools the stator coil, and the other part cools the rotor and the stator core, and finally converges at the air inlet to perform the next circulation flow process.

[0029] 5、The present application sets the first air baffle in the inner cylinder in the radial direction, which can guide the gas flow to the centrifugal fan and also play a partitioning role to prevent leakage in the motor and thus prevent water leakage. The centrifugal fan is arranged at the gap between the first air baffle and the rotor yoke, so that the rotor and the stator core can be protected by the two first air baffles from the influence of leakage. The second air baffle is further arranged in the cooling cavity, so as to prolong the flow path of the gas, increase the contact time of the gas in the inner cylinder with the water pipe, and improve the cooling efficiency of the gas.

[0030] 6、The present application supports the inner cylinder through the struts, and closes the front and rear ends of the two groups of struts through the front and rear two groups of partition plates, so as to form the cooling cavities arranged uniformly along the circumference of the outer cylinder. The gaps between adjacent cooling cavities allow the water flow to pass through the outer cylinder normally. Under the synergistic action of the sealing strip and the shock-absorbing pad, the sealing performance is ensured while the mechanical vibration is buffered. The setting of the water collecting tank can accumulate the leakage generated in the inner cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 It is a structural schematic diagram of the present application.

[0032] Fig. 2 It is a structural schematic diagram of the submersible motor in the present application.

[0033] Fig. 3 It is a side view of the submersible motor in the present application.

[0034] Fig. 4 It is an assembly schematic diagram of the shaft and the rotor yoke.

[0035] In the figure:

[0036] 1, inner cylinder;

[0037] 11, rotor core; 111, rotor ventilation groove; 112, rotor yoke; 113, centrifugal fan;

[0038] 12, stator core; 121, stator ventilation groove; 122, stator coil;

[0039] 13, shaft; 14, first air baffle;

[0040] 2, outer cylinder; 21, water pipe; 22, support plate;

[0041] 221, partition plate; 222, support rib; 223, sealing strip; 224, shock pad;

[0042] 23, second air deflector; 24, air outlet; 25, air inlet; 26, water collecting tank; 27, junction box;

[0043] 3, pump body; 31, first oil chamber; 311, first axial thrust bearing; 312, first radial bearing;

[0044] 32, second oil chamber; 321, second axial thrust bearing; 322, second radial bearing;

[0045] 33, impeller; 34, pump shaft. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] Please refer to Figs. 1-4 In the embodiments of the present application, a high-power submersible tubular pump, a submersible motor in the tubular pump includes an inner cylinder 1 and an outer cylinder 2 coaxially sleeved outside the inner cylinder 1, a cylinder cavity of the inner cylinder 1 is used as a motor cavity and is sealed inside, and an annular gap exists between the inner cylinder 1 and the outer cylinder 2 for water flow.

[0048] The outer cylinder 2 is a haf structure and is in a multi-petal form, and can be assembled and fixed into a shape.

[0049] Support plates 22 are uniformly arranged along the radial direction of the outer cylinder 2 between the outer cylinder 2 and the inner cylinder 1 to connect and support the inner cylinder 1, and hollow areas exist between adjacent support plates 22 to allow water to normally pass through the outer cylinder 2.

[0050] Each group of support plates 22 includes two rows of support ribs 222 arranged in the radial direction, the length of the support rib 222 matches the length of the outer cylinder 2, and the gap at the front and rear ends of the two rows of support ribs 222 is closed by a partition plate 221, so that the two groups of partition plates 221, the two groups of support ribs 222, the outer cylinder wall of the inner cylinder 1, and the inner cylinder wall of the outer cylinder 2 can enclose a cooling cavity arranged along the length direction of the outer cylinder 2.

[0051] The partition plate 221 is sealed from the inner cylinder 1 by a sealing strip 223, and the partition plate 221 and the outer cylinder are provided with a shock pad 224, so that the cooling cavity can be in a sealed state through the use of the sealing strip 223 and the shock pad 224.

[0052] The water pipes 21 are arranged in several groups and sequentially penetrate the two groups of partition plates 221 along the axial direction of the outer cylinder 2, so that the water flow on one side of the outer cylinder 2 can also flow to the other side of the outer cylinder 2 through the water pipes 21, and the water pipes 21 pass through the cooling cavity.

[0053] The power cable and the control cable in the inner cylinder 1 pass through the wiring pipe and are connected to the wiring box 27 outside the outer cylinder 2 and are in communication with the power source.

[0054] The two ends of the inner cylinder 1 are sealed by end covers, and the rotating shaft 13 is coaxially arranged in the cylinder cavity of the inner cylinder 1, one end of the shaft body of the rotating shaft 13 extends out of the inner cylinder 1 to serve as a power shaft. Bearings are arranged at the end covers of the two ends of the inner cylinder 1 to form a rotary fit with the rotating shaft 13, and a mechanical seal is arranged at the contact surface between the rotating shaft 13 and the inner cylinder 1.

[0055] The rotor core 11 is sleeved outside the rotating shaft 13, and the inner ring of the rotor core 11 is arranged in a radial direction and is spaced apart to form rotor yokes 112, so that the rotor yokes 112 are coaxially fixed with the rotating shaft 13, and there is a gap between adjacent rotor yokes 112.

[0056] The inner wall of the inner cylinder 1 is also fixed with a stator core 12 through a fixing plate, the stator core 12 is coaxially sleeved outside the rotor core 11, so that after being electrified, the stator core 12 can generate electromagnetic induction cooperation to drive the rotating shaft 13 to rotate.

[0057] The rotor core 11 is uniformly and spacedly arranged with rotor ventilation grooves 111 in a radial direction, and the stator core 12 is uniformly and spacedly arranged with stator ventilation grooves 121 in a radial direction, and the rotor ventilation grooves 111 and the stator ventilation grooves 121 are positionally corresponding to form a cooling passage.

[0058] The inner cylinder 1 is provided with an air inlet 25 in the middle of the cylinder wall, which is in communication with the cooling cavity, one end of the cooling passage is positionally corresponding to the air inlet 25, and the other end is in communication with the gap between adjacent rotor yokes 112.

[0059] Centrifugal fans 113 are arranged at the two ends of the rotor core 11, and when the centrifugal fans 113 rotate synchronously with the rotor core 11, air pressure can be generated to make the gas in the inner cylinder 1 circulate.

[0060] The cylinder wall of the inner cylinder 1 is provided with air outlets 24 at the front and rear ends, and the second air guide plate 23 extends from the cylinder wall of the inner cylinder 1 to the cylinder wall of the outer cylinder 2 between the air outlets 24 and the air inlets 25, thereby prolonging the flow time of the gas in the cooling cavity.

[0061] The plate end of the fixing plate for supporting the stator core 12 is provided with a first air guide plate 14 arranged in a radial direction, the two ends of the stator core 12 are provided with stator coils 122, and the position of the first air guide plate 14 is between the air outlet 24 and the stator coil 122.

[0062] There is a gap between the first air baffle 14 and the rotor yoke 112, and the centrifugal fan 113 is arranged at the gap. There is a gap between the first air baffle 14 and the end cover of the inner cylinder 1, so that the air flow from the air outlet 24 is guided to the centrifugal fan 113.

[0063] When the centrifugal fan 113 works, the air flow from the air outlet 24 is divided into two streams, one of which reaches the air inlet 25 after passing through the stator coil 122, and the other reaches the air inlet 25 after passing through the gap between the adjacent rotor yokes 112 and the cooling passage in sequence. The gas in the inner cylinder 1 enters the cooling cavity after passing through the air inlet 25 and exchanges heat with the pipe wall of the water pipe 21, and then flows back to the cylinder cavity of the inner cylinder 1 from the air outlet 24, so as to realize the circulation of the gas.

[0064] A water collecting tank 26 is arranged below the inner cylinder 1 and communicates with the outer cylinder 2. The water collecting tank 26 and the cylinder cavity of the inner cylinder 1 are in communication and are located directly below the first air baffle 14.

[0065] The outer cylinder 2 is communicated with the drainage pipeline at both front and rear ends.

[0066] The pump body 3 is arranged in the drainage pipeline at the upstream end of the outer cylinder 2, and the first oil chamber 31, the impeller chamber and the second oil chamber 32 are arranged in sequence in the pump body 3 in the axial direction. One end of the pump shaft 34 is located in the first oil chamber 31, and the first oil chamber 31 is provided with the first axial thrust bearing 311 for bearing the axial load on one side of the pump shaft 34 and the first radial bearing 312 for bearing the radial load on one side of the pump shaft 34.

[0067] The other end of the pump shaft 34 penetrates through the second oil chamber 32 and is coaxially fixedly connected with the rotating shaft 13 through the planetary gear reducer box, and the second oil chamber 32 is provided with the second axial thrust bearing 321 for bearing the axial load on the other side of the pump shaft 34 and the second radial bearing 322 for bearing the radial load on the other side of the pump shaft 34.

[0068] The pump shaft 34 is also coaxially fixed with the impeller 33 of the impeller chamber through a key, and the blades of the impeller 33 extend into the drainage pipeline. When the impeller 33 rotates synchronously with the pump shaft 34 and the rotating shaft 13, the water in the water pipeline is continuously transported forward.

[0069] After the support plate installation 22 is installed, the cooler is formed and is sealingly connected with the inner cylinder 1 through a flange, forming a detachable structure, so as to reduce the volume and weight of a single part and facilitate transportation and installation.

[0070] The above describes the basic principles of the present application in combination with specific embodiments, but it needs to be pointed out that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0071] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0072] It also needs to be pointed out that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present application.

[0073] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0074] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A high-power submersible cross-flow pump, characterized in that, It includes the following components: The inner cylinder (1) has a sealed cavity. The rotating shaft (13) is rotatably coupled with the inner cylinder (1) and its contact surface with the inner cylinder (1) is sealed. The rotor assembly is arranged inside the inner cylinder (1) and fixed coaxially with the rotating shaft (13); The stator assembly is arranged inside the inner cylinder (1) and electromagnetically engages with the rotor assembly to drive the rotor assembly and the shaft (13) to rotate. The outer cylinder (2) is connected to the drainage pipe at both ends. The inner cylinder (1) is coaxially arranged inside the outer cylinder (2). The outer cylinder (2) and the inner cylinder (1) are supported and fixed by the support plate (22). At least two sets of support plates (22) are provided along the axial direction of the outer cylinder (2). The outer cylinder (2), the inner cylinder (1) and each support plate (22) enclose a sealed cooling chamber. The cooling chamber is connected to the cylinder cavity of the inner cylinder (1). Water pipe (21) passes through each support plate (22) and thus through the cooling chamber of the outer cylinder (2). Both ends of the water pipe (21) are connected to the external fluid. The drive assembly drives the gas in the inner cylinder (1) cavity to enter the cooling chamber and exchange heat with the water pipe (21); The pump body (3) is arranged coaxially with the inner cylinder (1). The pump body (3) is provided with a first oil chamber (31), an impeller chamber and a second oil chamber (32) in sequence along the axial direction. The two ends of the pump shaft (34) are located in the first oil chamber (31) and the second oil chamber (32) respectively. The impeller (33) of the impeller chamber is coaxially fixed on the shaft body of the pump shaft (34). The first oil chamber (31) and the second oil chamber (32) are provided with bearing parts that rotate with the pump shaft (34) to form two-point support for the pump shaft (34). The shaft body of the pump shaft (34) passes through the second oil chamber (32) and is coaxially fixed with the rotating shaft (13). The rotor assembly includes a rotor core (11) with a rotor ventilation slot (111) in the radial direction, and the stator assembly includes a stator core (12) with a stator ventilation slot (121) in the radial direction. The rotor ventilation slot (111) and the stator ventilation slot (121) are positioned correspondingly and can be connected to form a cooling passage for gas flow. The inner cylinder (1) has an air inlet (25) and an air outlet (24) on its wall so that the gas in the inner cylinder (1) can flow back into the inner cylinder (1) after passing through the air inlet (25), the cooling chamber and the air outlet (24) in sequence; the inner ring of the rotor core (11) is evenly arranged with rotor axes (112) along the circumference and is connected to the rotating shaft (13) through the rotor axes (112); the drive assembly is a centrifugal fan (113) coaxially fixed on the rotor assembly; The support plates (22) are evenly spaced along the circumference, and fluid channels are formed between adjacent support plates (22) to allow fluid to pass through the outer cylinder (2); The support plate (22) comprises a radial support rib (222) connecting the outer cylinder (2) and the inner cylinder (1), and further comprises two partition plates (221) located at the front and back ends of the outer cylinder (2) and corresponding to the positions of the support rib (222), the two partition plates (221), the two support ribs (222), the outer cylinder (2) and the inner cylinder (1) are matched with each other to form a cooling cavity; the contact surface between the partition plate (221) and the inner cylinder (1) is sealed by a sealing strip (223) matching the shape of the partition plate (221), and the contact surface between the partition plate (221) and the wall of the outer cylinder (2) is provided with a shock pad (224).

2. A large power submersible cross flow pump according to claim 1, characterized in that, The pump shaft (34) and the rotating shaft (13) are connected through a planetary gear reduction box; the bearing part comprises a first axial thrust bearing (311), a first radial bearing (312), a second axial thrust bearing (321) and a second radial bearing (322), the first axial thrust bearing (311) is located in the first oil chamber (31) to bear the axial load on one side of the pump shaft (34), and the second axial thrust bearing (321) is located in the second oil chamber (32) to bear the axial load on the other side of the pump shaft (34); the first radial bearing (312) is located in the first oil chamber (31) to bear the radial load on one side of the pump shaft (34), and the second radial bearing (322) is located in the second oil chamber (32) to bear the radial load on the other side of the pump shaft (34).

3. A large power submersible cross-flow pump according to claim 1, characterized in that, The position of the air inlet (25) corresponds to the position of the stator ventilation groove (121), the air outlet (24) has two groups and is arranged at the front and back ends of the inner cylinder (1), the centrifugal fan (113) has two groups and is arranged at the front and back ends of the rotor core (11) to correspond to the position of the stator coil (122), the fluid discharged from the air outlet (24) is distributed by the centrifugal fan (113), part of which passes through the stator coil (122) and then reaches the air inlet (25), and the other part sequentially passes through the gap between the rotor yokes (112) and the cooling passage and then reaches the air inlet (25).

4. A large power submersible cross-flow pump according to claim 1 or 3, characterized in that, The inner cylinder (1) is provided with a first air guide plate (14) corresponding to the two centrifugal fans (113) in the radial direction, the first air guide plate (14) is located between the end cover of the inner cylinder (1) and the corresponding centrifugal fan (113), and there is a gap between the plate end of the first air guide plate (14) and the rotor yoke (112), and the corresponding centrifugal fan (113) is installed at the gap.

5. A large power submersible cross flow pump according to claim 1 or 3, characterized in that, The outer cylinder (2) is coaxially arranged with the inner cylinder (1), the wall of the inner cylinder (1) is provided with a second air guide plate (23) extending to the wall of the outer cylinder (2) in the radial direction, and the second air guide plate (23) is located between the air inlet (25) and the air outlet (24).

6. The high-power submersible cross-flow pump according to any one of claims 1-3, characterized in that, A water collecting tank (26) is further arranged between the inner cylinder (1) and the outer cylinder (2) and located at the bottom of the inner cylinder (1), the water collecting tank (26) is positionally avoided from the support plate (22), and the water collecting tank (26) is in communication with the cylinder cavity of the inner cylinder (1).

7. The high-power submersible cross-flow pump according to any one of claims 1-3, characterized in that, The outer cylinder (2) is a split half structure, the power cable and control cable in the inner cylinder (1) are connected to the terminal box (27) outside the outer cylinder (2) through the terminal pipe.

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