A full-through flow pump with reduced motor energy loss

Abstract

The application relates to a full-through flow pump capable of reducing motor energy loss, which comprises a water guide cone, a suction chamber, a motor stator, a motor rotor, an impeller and a guide vane body; the hub of the impeller is radially fixed by a stopper on a bearing pressure cover of the full-through flow pump and a tapered roller bearing, the outer ring of the bearing rotates along with the impeller, the inner ring of the bearing is fixed with the shaft, and the guide vane body is axially fixed with the pump shell; a ring-shaped water throwing disc is welded on the fixed wall surface in the motor stator outer cylinder, and a ring-shaped water blocking disc is welded on the impeller outer shell; a water collecting groove is arranged at the bottom of the full-through flow pump; the internal structure of the pump motor cavity is changed without changing the original appearance size and flow area of the full-through flow pump; the ring-shaped water throwing disc is welded on the fixed wall surface in the motor stator outer cylinder, the water blocking disc is welded on the impeller outer shell, the water collecting groove is added at the bottom of the pump, the water in the water collecting groove is sucked by an external water ring vacuum pump, the motor stator cooling is changed from water cooling to air cooling, and the water state in the motor cavity is maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of whole through-flow pumps, specifically relates to a kind of whole through-flow pumps of reducing motor energy loss under the premise of retaining existing structure, can improve the internal environment of motor, solve the temperature rise when motor operates, reduce the eddy current formed in the stator channel of motor due to high-speed rotation of rotor, finally reduce the friction energy loss of whole through-flow pump, improve the hydraulic efficiency of pump device. BACKGROUND

[0002] Whole through-flow pump belongs to one kind of horizontal axial flow pump, has the characteristics of large flow and low lift, pump motor uses wet stator structure, wet stator uses water-resistant winding coil, coil is made by multi-layer co-melting co-extrusion technology, winding coil is cooled by water, without sealing requirement, thereby reducing the security risk of burning motor due to sealing failure and leakage, the above structural advantages make it widely used in urban rainwater flood control and drainage, water conservancy projects and farmland irrigation.

[0003] Figure 1 It is the overall structure schematic diagram of the whole through-flow pump currently common, mainly includes: water guide cone 1, hexagonal bolt 2, elastic pad 3, suction chamber 4, stator 5, rotor 6, impeller 7, guide vane body 8, O-shaped sealing ring 9, hexagonal stud 10, nut 11, soft pad 12, key 13.When pump is connected to external power supply, motor rotor 6 cuts magnetic line to form induced electromotive force to drive impeller 7 to rotate and work, so that pressure difference is generated at both ends of flow passage, and liquid is efficiently transported after rectification by guide vane body 8.

[0004] From Figure 1 It can be seen that the working process of whole through-flow pump includes three parts: suction process, impeller pressurization and discharge process. The suction process refers to when the pump is connected to external power supply, the motor drives the impeller to rotate at high speed, the liquid pressure at the inlet of the impeller is lower than the external liquid pressure, under the action of the pressure difference, the external liquid will be continuously sucked into the runner chamber; the pressurization process refers to that the liquid entering the impeller obtains kinetic energy and pressure energy under the action of rotating blades; the discharge process refers to that the liquid after obtaining energy flows out from the impeller, enters the rear guide vane body for rectification, recovers part of the pressure, and discharges from the pump body.

[0005] Since whole through-flow pump adopts non-sealing structure, there are two places of leakage in the liquid pumping process: one is that the liquid enters the motor cavity through the front end face gap (A place) and the rear end face gap (B place) between the runner chamber and the guide vane body; the other is that the motor stator core is formed by stacking countless punching sheets along the axial direction, there is a very small stator gap channel between adjacent punching sheets, the stator slots are uniformly distributed along the circumferential direction, and the high-speed rotating motor rotor will bring the liquid in the motor cavity into the stator slots; when the pump is started, the high viscosity of water flow makes the high-speed rotating motor rotor form a large amount of eddy current in its adjacent stator channel, thereby reducing the conveying efficiency of whole through-flow pump. SUMMARY

[0006] In order to solve the above problems, the main purpose of the present application is to provide a full-through flow pump capable of reducing the energy loss of the motor, improving the internal environment of the motor, solving the temperature rise problem of the motor during operation, reducing the eddy current formed by the high-speed rotation of the rotor in the stator slot of the motor, and ultimately reducing the friction energy loss of the full-through flow pump and improving the hydraulic efficiency of the pump device.

[0007] The present application solves the above technical problems by the following technical scheme: a full-through flow pump capable of reducing the energy loss of the motor, comprising: a water guide cone, a suction chamber, a motor stator, a motor rotor, an impeller, and a guide vane body; the water guide cone is axially fixed on the end faces of the suction chamber; the outer shell of the motor stator is fixed on the inner wall of the pump shell; and the motor rotor and the impeller shell are fixed together.

[0008] The hub of the impeller is radially fixed by the stopper on the bearing pressure cover of the full-through flow pump and the tapered roller bearing, the outer ring of the bearing rotates with the impeller, the inner ring of the bearing is fixed, and the guide vane body is axially fixed with the pump shell.

[0009] An annular water throwing disc is welded on the inner wall of the motor stator outer cylinder, and an annular water blocking disc is welded on the impeller shell; a water collecting tank is arranged at the bottom of the full-through flow pump, and the water collecting tank is located at the center of the bottom of the full-through flow pump and is in communication with the pump shell.

[0010] The outer ring of the annular water throwing disc is welded and fixed in the motor stator outer cylinder; and the inner ring of the annular water blocking disc is obliquely installed on the end faces of the motor rotor.

[0011] In the specific embodiment of the present application, the thickness of the annular water throwing disc is 5-10 mm, and the outer ring of the annular water throwing disc is welded and fixed with the inner wall of the pump shell in the normal direction.

[0012] In the specific embodiment of the present application, the thickness of the annular water blocking disc is 5-10 mm, and the inner ring of the annular water blocking disc is obliquely installed on the end faces of the motor rotor at an angle of 30-60°.

[0013] In the specific embodiment of the present application, the inner ring of the bearing is axially fixed by means of a stop washer and a circular nut.

[0014] In the specific embodiment of the present application, the outer ring of the guide vane body is axially fixed with the pump shell by means of hexagonal bolts and elastic pads; and the guide vane body is end face sealed by means of an O-shaped sealing ring.

[0015] In the specific embodiment of the present application, the water guide cone is axially fixed on the end faces of the suction chamber by means of hexagonal bolts and elastic pads.

[0016] In the specific embodiment of the present application, the outer shell of the motor stator is anchored on the inner wall of the pump shell by means of an axial flange and a circumferential shear key.

[0017] In the specific embodiment of the present application, the motor rotor and the impeller shell are fixed together by welding; the bearing inner ring is axially fixed by means of a stop washer and a round nut.

[0018] In the specific embodiment of the present application, the guide vane body outer ring and the pump shell are axially fixed by means of a hexagonal bolt combined with a spring washer; the guide vane body is end face sealed by means of an O-shaped sealing ring.

[0019] In the specific embodiment of the present application, the motor stator and the motor rotor cooling mode is air cooling; the suction chamber is provided with a sand discharge hole.

[0020] The positive progress effect of the present application is that the full tubular pump for reducing motor energy loss has the following advantages compared with the traditional full tubular pump structure:

[0021] (1) Compared with the traditional tubular pump test, the full tubular pump can quickly and accurately predict the energy loss in the motor cavity by sealing the impeller chamber and testing the no-load input power, which shortens the test cycle and cost.

[0022] (2) The energy-saving and consumption-reducing structural improvement measure can greatly improve the system device efficiency of the full tubular pump, while maintaining its original structural advantages.

[0023] (3) The new tubular pump after structural improvement has the advantages of low manufacturing cost, shortened processing cycle, reduced manual intervention, etc., which promotes social economic benefits.

[0024] The present application retains the structural advantages of the original tubular pump, does not change the external dimensions and flow area, changes the internal structure of the pump motor cavity, welds a ring-shaped water throwing disc in the motor stator outer cylinder, welds a water baffle on the impeller shell, increases a water collecting groove at the bottom of the pump, and uses an external water ring vacuum pump to suck water in the water collecting groove. The motor stator and rotor cooling is changed from water cooling to air cooling, and the motor cavity is maintained in a water-free state. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the full tubular pump.

[0026] Figure 2 It is a schematic diagram of the overall structure of the full tubular pump.

[0027] Figure 3 It is Figure 2 the local schematic diagram of the water throwing disc and the water baffle.

[0028] Figure 4 It is a schematic diagram of the installation position of the water collecting groove in the present application.

[0029] Figure 5The commercial analysis software of computational fluid dynamics is used to set the rotating period boundary condition and the three-dimensional turbulent flow numerical solution calculation simulation diagram.

[0030] The following is the name corresponding to the label in the application:

[0031] In the figure: water cone 1, hexagonal bolt 2, elastic pad 3, suction chamber 4, stator 5, rotor 6, impeller 7, guide vane body 8, O-shaped sealing ring 9, hexagonal stud 10, nut 11, soft pad 12, key 13, motor stator outer cylinder 14, annular water throwing disc 15, water baffle 16, water collecting tank 17, sand discharge hole 18, radial gap 19. DETAILED DESCRIPTION

[0032] The preferred embodiments of the application are described below in conjunction with the accompanying drawings to specifically describe the technical solutions of the application.

[0033] The application focuses on solving the problems in the background art, and under the premise of retaining the advantages of the existing structure, a new structure is invented to improve the internal environment of the motor, which not only solves the temperature rise problem during motor operation, but also reduces the eddy current formed in the stator slot of the motor due to the high-speed rotation of the rotor, finally reduces the friction energy loss of the whole-through flow pump, and improves the hydraulic efficiency of the pump device.

[0034] Figure 2 The overall structure diagram of the application is shown in Figure 2 A whole-through flow pump for reducing energy loss of a motor is provided, which comprises a water cone 1, a suction chamber 4, a motor stator 5, a motor rotor 6, an impeller 7, and a guide vane body 8.

[0035] The hub of the impeller 7 is radially fixed by the stopper on the upper bearing gland of the whole-through flow pump and the tapered roller bearing, the outer ring of the bearing rotates with the impeller, the inner ring of the bearing is fixed, the guide vane body 8 is axially fixed with the pump shell, and the inner ring of the bearing is axially fixed by the stop washer and the round nut.

[0036] The annular water throwing disc 15 is welded to the inner wall surface of the motor stator outer cylinder 14, and the annular water baffle 16 is welded to the outer shell of the impeller 7; the outer ring of the annular water throwing disc 15 is welded and fixed in the motor stator outer cylinder 14; the inner ring of the annular water baffle 16 is installed obliquely on the two side surfaces of the motor rotor. Figure 4 A water collecting tank 17 is arranged at the bottom of the whole-through flow pump (see

[0037] The application changes the internal structure of the pump motor cavity, the annular water throwing disc is welded on the fixed wall surface in the motor stator outer cylinder 14, the water baffle is welded on the impeller 7 outer shell, the water collecting groove is added at the pump bottom, the water in the water collecting groove is pumped by the external water ring vacuum pump, the motor stator cooling is changed from water cooling to air cooling, and the water state of the motor cavity is maintained.

[0038] Figure 3 For Figure 2 The annular water throwing disc 15 in the application has a thickness of 5-10mm, the outer ring of the annular water throwing disc is welded and fixed with the pump inner shell wall surface in a normal direction, the annular water baffle 16 has a thickness of 5-10mm, and the inner ring of the annular water baffle is installed in a 30-60° inclination with the two sides of the motor rotor end surface.

[0039] The water guide cone 1 in the application is axially fixed on the two sides of the suction chamber 4 by using hexagonal bolts 2 and elastic pads 3.

[0040] In the specific implementation process, the outer shell of the motor stator 5 in the application can be anchored in the inner wall of the pump shell by using axial flanges and circumferential shear keys.

[0041] In the specific implementation process, the motor rotor 6 and the impeller outer shell in the application are fixed together by using the welding mode.

[0042] In the specific implementation process, the inner ring of the bearing in the application is axially fixed by relying on the stop washer and the round nut.

[0043] The outer ring of the guide vane body 8 in the application is axially fixed by using hexagonal bolts combined with elastic pads; and the guide vane body 8 is end surface sealed by using O-shaped sealing rings 9.

[0044] In the specific implementation process, the motor stator and rotor cooling mode in the application can generally be air cooling.

[0045] In the specific implementation process, the suction chamber 4 in the application can also be provided with a sand discharging hole 18.

[0046] The application is mainly applied to improving the actual product efficiency of the whole-through flow pump, based on the viscous fluid dynamics basic theory, combined with the modern CFD numerical calculation method to quickly and accurately evaluate the energy consumption of the pump motor, taking the whole-through flow pump product as the research object, the motor cavity water gap is divided into three parts: the axial end surface gap on the left and right sides of the rotor, the radial gap in the stator and rotor channel, the flow end surface gap (delta=3mm) and the radial gap (delta=2mm) calculation model is established, the commercial software of computational fluid dynamics is used to compare the influence of two different viscous media, air and water, on the operating energy consumption, and the calculation results show that the high viscosity of water leads to 485 times energy loss of the pump motor cavity than air. Therefore, the improvement scheme is proposed: on the basis of reducing the axial end surface gap and the radial gap of the motor rotor, high pressure air is injected into the radial gap of the motor cavity, the cooling mode of the motor stator and rotor is changed from water cooling to air cooling, and the stator and rotor are maintained without water operation; the water disc with taper is added to the both ends of the motor rotor, and the water disc is placed on the inner surface of the motor stator shell, so that the water flow in the pump body does not enter the radial gap of the stator and rotor, and the hydraulic friction loss in the radial gap of the stator and rotor during operation is greatly reduced, and the system operation efficiency of the whole-through flow pump is improved by 20%.

[0047] In order to further verify the actual effect of the application, the technical scheme for evaluating and reducing the energy loss of the gap between the motor stator and rotor of the whole-through flow pump based on CFD is adopted, and the verification process specifically includes the following steps:

[0048] Step (1): the motor cavity water gap is divided into three parts: the axial end surface gap on the left and right sides of the impeller chamber (rotor), and the radial gap in the motor stator and rotor channel.

[0049] Step (2): considering that the number of circumferential grooves of the motor stator and rotor is large and has obvious periodicity, when simulating calculation, in order to improve the computer solving accuracy and convergence, the full hexahedral boundary layer grid is used for grid division of the three-dimensional single channel.

[0050] Step (3): the commercial analysis software of computational fluid dynamics is used to set the rotation period boundary condition and three-dimensional turbulent flow numerical solution calculation, as shown in Figure 5 .

[0051] Step (4): the calculation results show that the power loss of the water medium under the no-slip rotating wall boundary condition of the motor rotor is much higher than that of the air, and the energy loss caused by the water is 485 times that caused by the air.

[0052] Step (5): taking the full-through pump as an example, the axial end face gap on the left and right sides of the rotor and the radial gap inside the stator and rotor channel are reduced, a small air hole is opened on the pump shell, an air pipe is led to the radial gap, high-pressure air is injected into the radial gap by an external air compressor through the air pipe to cool the stator and rotor, and the cooling mode of the motor stator and rotor is changed from water cooling to air cooling, so that the motor stator and rotor are kept in a water-free running state.

[0053] Step (6): a water throwing disc with a taper is added on the two sides of the motor rotor, a water baffle is arranged on the inner surface of the motor stator shell, a water collecting groove is arranged at the bottom of the pump shell, the water flow sprayed from the end face gap on the two sides of the rotating impeller rotor is collected in the water collecting groove below, and the water flow is pumped away by an external water ring vacuum pump, so that the water flow does not enter the radial gap of the motor stator and rotor channel during pump operation, the water friction loss in the radial gap of the motor stator and rotor is reduced, and the device operation efficiency of the full-through pump is improved.

[0054] The present application retains the structural advantages of the original through pump, does not change the size and flow area, changes the internal structure of the pump motor cavity, welds a ring-shaped water throwing disc on the inner wall of the motor stator outer cylinder, welds a water baffle on the impeller shell, increases a water collecting groove at the bottom of the pump, and pumps the water in the water collecting groove by an external water ring vacuum pump, so that the motor stator and rotor cooling is changed from water cooling to air cooling, and the motor cavity is kept in a water-free state.

[0055] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application, and the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A full-flow pump that reduces motor energy loss, characterized in that: The full-flow pump for reducing motor energy loss includes: a guide cone, a suction chamber, a motor stator, a motor rotor, an impeller, and a guide vane body; the guide cone is axially fixed to both end faces of the suction chamber, the outer casing of the motor stator is fixed to the inner wall of the pump casing, and the motor rotor is fixed together with the impeller casing. The impeller hub is radially fixed by the stop on the bearing cover of the full-flow pump and the tapered roller bearing. The outer ring of the bearing rotates with the impeller, the inner ring of the bearing is fixed to the shaft, and the guide vane is axially fixed to the pump housing. An annular water-throwing plate is welded to the inner wall of the motor stator outer cylinder, and an annular water-baffle plate is welded to the impeller outer shell; a water collection tank is set at the bottom of the full-flow pump, and the water collection tank is located at the center of the bottom of the entire full-flow pump and is connected to the pump casing. The outer ring of the annular water-splashing plate is welded and fixed inside the outer cylinder of the motor stator; the inner ring of the annular water-baffle plate is installed at an angle to the two end faces of the motor rotor. The thickness of the annular water-throwing plate is 5-10mm, and the outer ring of the annular water-throwing plate is welded and fixed to the normal surface of the pump inner shell. The thickness of the annular baffle plate is 5-10mm, and its inner ring is installed at a 30-60° angle to the two end faces of the motor rotor.

2. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The inner ring of the bearing is axially fixed by a retaining washer and a round nut.

3. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The outer ring of the guide vane is axially fixed to the pump housing using hexagonal bolts and spring washers; the guide vane body uses O-rings for end face sealing.

4. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The water guide cone is axially fixed to the two end faces of the suction chamber using hexagonal bolts and spring washers.

5. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The motor stator housing is anchored to the pump casing inner wall via an axial flange and a circumferential shear key.

6. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The motor rotor and impeller housing are fixed together by welding; the bearing inner ring is axially fixed by a retaining washer and a round nut.

7. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The outer ring of the guide vane is axially fixed to the pump housing using hexagonal bolts and spring washers; the guide vane body uses O-rings for end face sealing.

8. The full-flow pump for reducing motor energy loss according to claim 1, characterized in that: The motor stator and rotor are cooled by air; the intake chamber is equipped with sand discharge holes.

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