Double-stator water-filled submersible tubular pump

Abstract

The application discloses a double-stator water-filled submersible cross-flow pump, which is characterized in that an axial rotor core is arranged between a guide vane body and a water suction chamber in a motor cavity, axial stator cores are arranged on both sides of the axial rotor core in the motor cavity, stator coils are arranged on the outer sides of the axial stator cores in the motor cavity, and a rotor assembly connected with the axial rotor core is arranged between the middle positions of the water suction chamber and the guide vane body. The whole structure has the characteristics of a greatly shortened axial distance, improved heat dissipation effect, compact structure, light weight, safety and reliability, and the two stator cores are placed on both sides of the impeller rotor core, so that the impeller rotor is prevented from rotating in water to generate large friction loss, the water pump efficiency is greatly improved, and meanwhile, the two stator cores are used in parallel, and can be used alone under light load, so that the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submersible electric pumps, and particularly relates to a double-stator water-filled submersible cross-flow pump. BACKGROUND

[0002] At present, there are two structural types of submersible cross-flow pumps, one is a submersible cross-flow pump matched with a traditional dry-type submersible motor, and the other is an impeller built-in type submersible cross-flow pump.

[0003] In the submersible cross-flow pump matched with the traditional dry-type submersible motor, the dry-type submersible motor and the pump body are relatively independent. The most significant feature is that the dry-type submersible motor is coaxially connected with the submersible pump, the dry-type submersible motor is placed in the water outlet flow channel of the submersible electric pump, the dry-type submersible motor is matched with a full-sealed structure, the inner cavity is dry air, the impeller of the pump is at the water inlet side of the submersible electric pump set, the impeller of the pump pumps water flow, and the water flow flows to the water outlet flow channel through the outer wall of the motor. The submersible electric pump of this structural type has the following disadvantages: first, the submersible motor is immersed in water for a long time, the sealing of the motor is difficult to guarantee, especially when the immersion depth is deep, the electrical insulation performance of the motor cannot be reliably guaranteed, there is a risk of leakage, and the dry-type submersible motor has safety hazards; secondly, the impeller of the pump is a cantilever beam structure, that is, there is only one bearing support point on the side of the impeller close to the motor or the support point is directly arranged in the motor cavity. This structure requires high machining precision and has poor anti-vibration performance. The impeller is prone to uneven gaps between edges, causing rubbing accidents between the rotating impeller and the fixed impeller shell. At the same time, the dry-type submersible motor is placed in the water outlet flow channel, which affects the water flow state of the pumped water flow and directly affects the efficiency of the submersible electric pump. The traditional dry-type submersible motor is immersed in water for a long time, which is difficult to maintain and has high maintenance cost

[0004] The impeller built-in type submersible cross-flow pump directly fixes the impeller assembly or blade of the submersible electric pump in the inner cavity of the water-filled submersible motor rotor, and welds the same into a whole with the water-filled submersible motor rotor, which is placed in the inner part of the water-filled submersible motor stator. The water-filled submersible motor stator is fixedly arranged in the stator shell, and the water-filled submersible motor stator and the water-filled submersible motor rotor are both placed in a radial concentric manner, and have a relatively long axial length. The stator core is assembled in the stator shell, and the axial ends of the stator shell are respectively connected with the water suction chamber and the water outlet chamber.

[0005] At present, there are two structural types of submersible cross-flow pumps, which generally adopt AC induction motors. The AC induction motor has low efficiency and low power factor. In particular, the power factor fluctuates greatly with the change of the load, and is only about 25% of the rated load or even lower under light load or no load. Meanwhile, the submersible electric pump with built-in impeller has the following deficiencies: since the integrated rotor (impeller assembly and water-filled submersible motor rotor) rotates in water, the friction loss of the impeller assembly rotating in water is comparable to the normal loss of the ordinary water pump, while the friction loss of the water-filled submersible motor rotor rotating in water is increased loss. This friction loss has two parts: one is the friction loss of the cylindrical surface of the water-filled submersible motor rotor, which is proportional to the fourth power of the rotor radius and the length of the rotor; the other is the friction loss of the end surface of the rotor, which is proportional to the fifth power of the rotor radius. The friction loss of the cylindrical surface of the rotor is about twice that of the end surface, and the friction loss power of the cylindrical surface of the rotor can be calculated according to the formula of disc friction loss. SUMMARY

[0006] The purpose of the present application is to overcome the deficiencies of the prior art and provide a double-stator water-filled submersible cross-flow pump.

[0007] The present application is achieved by the following technical solutions:

[0008] A double-stator water-filled submersible cross-flow pump comprises a water suction chamber, a guide vane body is arranged at one end of the water suction chamber, an electric motor cavity is arranged on the outer surface of the guide vane body and the outer surface of the water suction chamber, an axial rotor core is arranged inside the electric motor cavity between the guide vane body and the water suction chamber, axial stator cores are arranged on both sides of the axial rotor core inside the electric motor cavity, stator coils are arranged on the outer side of the axial stator cores inside the electric motor cavity, and a rotor assembly connected with the axial rotor core is arranged between the middle positions of the water suction chamber and the guide vane body.

[0009] A terminal box is arranged on the outer side of the electric motor cavity.

[0010] The guide vane body and the water suction chamber are symmetrically arranged about the axial rotor core.

[0011] The rotor assembly comprises a shaft, bearings and bearing covers are arranged on the outer surface of the shaft, a hub is arranged on the outer surface of the bearing cover, blades are fixedly connected to the surface of the hub, flow channel cylinders are fixedly connected to the other ends of the blades, and the axial rotor core is arranged on the flow channel cylinders.

[0012] Supports are fixedly arranged at both ends of the shaft, and the supports are fixedly arranged on the water suction chamber and the guide vane body, respectively.

[0013] The flow channel cylinders are located between the ends of the water suction chamber and the guide vane body.

[0014] The advantages of the present application are: the overall structure has the characteristics of greatly shortened axial distance, improved heat dissipation effect, compact structure, light weight, safety and reliability, etc., the two stator cores are innovatively placed on both sides of the impeller rotor core, the friction loss generated by the rotation of the impeller rotor in water is reduced, the efficiency of the water pump is greatly improved, and the two stator cores are used in parallel, and one can be used alone under light load, improving the operating efficiency; the axial stator core does not need to be closed, the coil can be manufactured in advance, and threading is not needed as in the traditional structure, saving manufacturing time. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present application.

[0016] Figure 2 It is a sectional view of the present application.

[0017] Figure 3 It is a structural schematic diagram of the rotor assembly of the present application. DETAILED DESCRIPTION

[0018] As shown in Figure 1 , 2 , 3, a double-stator water-filled submersible cross-flow pump, comprising a water suction chamber 1, a guide vane body 8 is arranged at one end of the water suction chamber 1, the outer surface of the guide vane body 8 and the outer surface of the water suction chamber 1 are provided with a same motor cavity 9, an axial rotor core 6 is arranged inside the motor cavity 9 between the guide vane body 8 and the water suction chamber 1, axial stator cores 4 are arranged on both sides of the axial rotor core 6 in the motor cavity 9, the existing technology adopts a radial stator core and a rotor core, the present application adopts an axial type, which shortens the length of the core and reduces friction loss, the axial stator core does not need to be closed, the coil can be manufactured in advance, threading is not needed as in the traditional structure, and manufacturing time is saved; the traditional one stator core is disassembled into two stator cores, only one stator core is powered when the power operation is low, and the operating power factor and efficiency are improved; stator coils 5 are arranged on the outside of the axial stator core 4 inside the motor cavity 9, and a rotor assembly 2 connected with the axial rotor core 6 is arranged between the middle positions of the water suction chamber 1 and the guide vane body 8.

[0019] A junction box 3 is arranged on the outside of the motor cavity 9, the motor cavity is composed of two cover shells connected with the guide vane body and the water suction chamber, the two cover shells are fixedly connected through a bolt-nut washer assembly, and a sealing ring 7 is arranged in the middle. The motor cavity 9 has a small volume, reduces the volume of the traditional stator shell, saves components, and reduces manufacturing cost.

[0020] The guide vane body 8 and the water suction chamber 1 are symmetrically arranged about the axial rotor core 6.

[0021] The rotor assembly is an integral structure, the rotor assembly 2 comprises a shaft 21, a bearing 22 and a bearing cover 23 are installed on the outer surface of the shaft 21, the bearing 22 comprises an angular contact bearing and a deep groove ball bearing, a wheel hub 24 is installed on the outer surface of the bearing cover 23, a blade 25 is fixedly connected on the surface of the wheel hub 24, a flow passage cylinder 26 is fixedly connected on the other end of the blade 25, and the axial rotor core 6 is installed on the flow passage cylinder 26.

[0022] The two ends of the shaft 21 are fixedly connected with the support 10, and the two ends of the support 10 are fixedly connected with the water suction chamber 1 and the guide vane body 8 respectively.

[0023] The flow passage cylinder 26 is located between the water suction chamber 1 and the guide vane body 8.

[0024] The working principle of the present application is as follows: the stator coil 5 is electrified to generate a rotating magnetic field, through electromagnetic induction, the axial rotor core 6, the flow passage cylinder 26, the wheel hub 24, the blade 25 and the bearing 22 are driven to rotate; the water suction chamber 1, the guide vane body 8 and the axial stator core 4 are stationary; water enters from the water suction chamber 1, passes through the wheel hub 24 and the blade 25, and flows out from the guide vane body 8.

Claims

1. A dual stator water-filled submersible crossflow pump, characterized by: The water absorption chamber is provided with a guide vane body at one end, and the outer surface of the guide vane body and the outer surface of the water absorption chamber are provided with a same motor cavity, the inside of the motor cavity is provided with an axial rotor core between the guide vane body and the water absorption chamber, the axial rotor core is provided with an axial stator core at both sides in the motor cavity, the axial stator core is provided with a stator coil at the outside in the motor cavity, and a rotor assembly connected with the axial rotor core is installed between the middle positions of the water absorption chamber and the guide vane body. A junction box is installed on the outside of the motor cavity. The rotor assembly comprises a shaft, a bearing and a bearing cover are installed on the outside of the shaft, a hub is installed on the outside of the bearing cover, blades are fixedly connected on the surface of the hub, a flow channel cylinder is fixedly connected on the other end of the blades, and the axial rotor core is installed on the flow channel cylinder.

2. The dual-stator water-filled submersible cross-flow pump according to claim 1, characterized in that: The guide vane body and the water absorption chamber are symmetrically arranged about the axial rotor core.

3. The dual stator water-filled submersible crossflow pump according to claim 1, characterized in that: The both ends of the shaft are respectively fixed with supports, and the both end supports are respectively fixed on the water absorption chamber and the guide vane body.

4. The dual stator water-filled submersible crossflow pump according to claim 1, characterized in that: The flow channel cylinder is located between the mutually close ends of the water absorption chamber and the guide vane body.

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