Device for pumping water by utilizing hollow shaft of motor rotor

Abstract

The invention discloses a water pumping device utilizing a motor rotor hollow shaft, which comprises an upper shell, a lower shell with a base, a left end cover, a right end cover, bearings, a stator, a rotor and a water inlet sealing sleeve with a sealing ring, and further comprises a rotor hollow shaft and a spiral propeller, the spiral propeller is fixed to the inner wall of the rotor hollow shaft, and the water inlet sealing sleeve is sleeved with the water inlet end of the rotor hollow shaft in a sealed mode through a sealing ring. According to the device, the spiral blades in the rotor hollow shaft rotate to push liquid to flow, a motor and pump integrated structure is achieved, heat generated in operation is taken away by pumped liquid, and the purpose of cooling the motor is achieved. The device has the characteristics that the structure is simplified, the product cost and the maintenance cost are reduced, and energy conservation and consumption reduction are realized through self-cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and in particular to a water pumping device using the hollow shaft of a motor rotor. Background Art

[0002] A water pump is a combined mechanical product of a motor and a pump body, which is widely used in various industries and has a huge market demand. Among many types and models, there is a horizontal spiral impeller pump, which is suitable for farmland irrigation, urban construction, petroleum, shipping, and water supply and drainage projects in industrial and mining enterprises. The pump body consists of key components such as a spiral impeller, a pump casing, inlet and outlet pipes, and bearings. The pump body is connected to the motor through a coupling. The working principle of the horizontal spiral impeller pump is that when the pump starts to operate, the motor drives the spiral impeller to rotate. After the liquid enters the pump casing through the inlet pipe, it first enters the spiral impeller. Under the rotation of the impeller, the liquid is pushed towards the outlet of the centrifugal pump casing. During this process, the spiral shape of the spiral impeller causes the liquid to form a vortex flow inside the impeller, thereby increasing the pressure of the liquid. Finally, when the liquid is pushed to the outlet of the pump casing, it will flow out through the outlet pipe.

[0003] According to the calculation of the General Machinery Industry Association, the power consumption of pump products accounts for about 20% of the national power generation. Therefore, the power saving of pumps is of great significance. The energy-saving measures of pumps mainly refer to that when the pump unit operates at the maximum power, the consumed electric energy drops to the lowest point, which involves the operation management of the pump itself. In the existing horizontal spiral impeller, it is connected to the motor through a coupling, and this structure has strict requirements for all aspects of design, manufacturing, installation, and operation. Some horizontal spiral impeller pumps mainly have the following problems: First, the axis of the installed unit is asymmetric and the swing exceeds the allowable value, resulting in a large starting torque during operation. Second, the resonance caused by the coincidence of the critical speed of the water pump and the natural frequency of the unit will generate strong vibration and noise, which is the main factor affecting energy conservation and consumption reduction. Third, the installation of a multi-stage impeller pump occupies a large space and has a high cost. Fourth, continuous operation requires frequent maintenance, which increases the cost and poses great limitations to design, construction, and installation. Therefore, it is necessary to find more reasonable energy-saving measures from all aspects of design, production, and equipment installation to reduce product costs and maintenance costs, which plays a crucial role in energy conservation and consumption reduction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a water pumping device using the hollow shaft of a motor rotor, which integrates the water pump and the motor, has the characteristics of simplified structure, reduced product costs and maintenance costs, and realizes energy conservation and consumption reduction through self-cooling.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A water pumping device using the hollow shaft of a motor rotor, comprising an upper shell, a lower shell with a base, a left end cover, a right end cover, bearings, a stator, a rotor, and a water inlet sealing sleeve provided with a sealing ring. It further includes a rotor hollow shaft and a screw propeller. The rotor hollow shaft is installed in the left end cover and the right end cover through bearings. The screw propeller is fixed to the inner wall of the rotor hollow shaft. The water inlet sealing sleeve is hermetically sleeved with the water inlet end of the rotor hollow shaft through a sealing ring.

[0006] For the above-mentioned water pumping device using the hollow shaft of a motor rotor, the iron cores of both the stator and the rotor are made of high-silicon steel, and the rotor hollow shaft is made of stainless steel.

[0007] For the above-mentioned water pumping device using the hollow shaft of a motor rotor, the screw propeller includes a central shaft and a plurality of continuous screw blades. The central shaft passes through the central holes of the screw blades and is fixedly connected. The outer periphery of the screw blades is fixedly connected to the inner wall of the rotor hollow shaft.

[0008] For the above-mentioned water pumping device using the hollow shaft of a motor rotor, docking convex edges are provided on the front and rear sides of both the upper shell and the lower shell, and the docking convex edges are docked through bolts.

[0009] For the above-mentioned water pumping device using the hollow shaft of a motor rotor, it further includes a water outlet sealing sleeve provided with a sealing ring. Both the water inlet sealing sleeve and the water outlet sealing sleeve are provided with bottom plates. The bottom plates are provided with central holes, and the sealing rings are installed in the central holes. Step holes are provided at the outer ends of both the left end cover and the right end cover. The water inlet sealing sleeve and the water outlet sealing sleeve are symmetrically installed in the left and right step holes and are hermetically connected to both ends of the rotor hollow shaft through sealing rings.

[0010] The water pumping device using the hollow shaft of a motor rotor provided by the present invention includes an upper shell, a lower shell with a base, a left end cover, a right end cover, bearings, a stator, a rotor, and a water inlet sealing sleeve provided with a sealing ring. It further includes a rotor hollow shaft and a screw propeller. The rotor hollow shaft is installed in the left end cover and the right end cover through bearings. The screw propeller is fixed to the inner wall of the rotor hollow shaft. The water inlet sealing sleeve is hermetically sleeved with the water inlet end of the rotor hollow shaft through a sealing ring.

[0011] The beneficial technical effects of the present invention are as follows:

[0012] First, the device can eliminate the motor fan, the pump body shell, and the coupling. By using the hollow shaft of the motor rotor to pump water, the integration design of the water pump and the motor is realized, reducing energy consumption. Using high-silicon steel to make the silicon steel sheets of the rotor can reduce the volume and diameter of the rotor, and increase the inner diameter of the rotor hollow shaft, creating conditions for improving the water pumping flow rate.

[0013] Second, the hollow shaft of the motor rotor pumps water to directly cool the rotor, which further cools the stator, achieving energy saving and consumption reduction through self-cooling, and stable operation with low noise.

[0014] Third, the front and rear sides of the upper shell and the lower shell are butted together by butt convex edges and bolts, which facilitates installation and maintenance.

[0015] Fourth, the overall structure is simplified, the installation space is reduced, the floor space is reduced, the operation is stable, and the noise is significantly reduced.

[0016] The device drives the liquid flow by the rotation of the spiral blades in the hollow shaft of the rotor, realizing the same structure of the motor and the pump. The heat generated during operation is taken away by the pumped liquid to achieve the purpose of cooling the motor. It is suitable for equipment with small installation space and low noise requirements, especially for installation on marine equipment. It has the characteristics of simplified structure, reduced product cost and maintenance cost, and energy saving and consumption reduction through self-cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 Internal structure diagram.

[0019] The components in the figure are numbered as follows: water outlet sealing sleeve 1, left end cover 2, lifting ring 3, upper shell 4, right end cover 5, water inlet sealing sleeve 6, lower shell 7, base 8, docking flange 9, bearing 10, stator winding 11, stator core 12, rotor core 13, sealing ring 14, middle shaft 15, spiral blade 16, bottom plate 17, step hole 18, rotor hollow shaft 19. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1-2As shown, a water pumping device using the hollow shaft of a motor rotor provided by the present invention may have a rotor core and a stator core made of high-silicon steel (usually with a silicon content of about 6.5%). The magnetic permeability and magnetic induction intensity of high-silicon steel are significantly higher than those of ordinary silicon steel (with a silicon content of 0.8% - 4.8%). Under the same magnetic field strength, high-silicon steel can provide a higher magnetic flux density, lower iron loss and higher efficiency, and can reduce the amount of materials required. At the same power output, the rotor volume can be reduced. High-silicon steel has higher mechanical strength, allowing for the design of a thinner rotor structure. By replacing ordinary silicon steel sheets with high-silicon steel, the rotor volume can be reduced by about 10% to 30%, creating conditions for reducing the diameters of the stator core 12 and the rotor core 13. Correspondingly, the inner diameter of the rotor hollow shaft 19 can be increased to improve the water pumping flow rate. To reduce the diameters and volumes of the stator core 12 and the rotor core 13, other materials can also be selected.

[0022] The material of the rotor hollow shaft 19 can be selected from stainless steel grades such as 1Cr18Ni9Ti, 316 or 314 stainless steel to prevent corrosion and rust under the premise of ensuring strength.

[0023] After the water inlet sealing sleeve 6 is connected to the water source, it can be started and operated. The water inlet sealing sleeve 6 and the water outlet sealing sleeve 1 can be replaced by a rotary joint, which is a sealed rotary connector that rotates 360° to convey the medium.

[0024] The method of fixedly connecting the spiral blade 16 to the inner wall of the rotor hollow shaft 19: In this device, the central shaft 15 of the screw propeller can be made of a stainless steel pipe with a wall thickness of 2.5 mm. The material of the spiral blade 16 is stainless steel with a thickness of 2.5 mm - 3 mm. The central shaft 15 is inserted into the central hole of the spiral blade 16 and welded. The outer peripheral surface of the spiral blade 16 is welded to the inner wall of the motor rotor hollow shaft 19. Plug covers are welded to both ends of the central shaft 15. The fixation of the motor rotor hollow shaft 19 and the screw propeller can adopt the hot-fitting method, and the standard of the hot-fitting gap is controlled between 0.02 and 0.05 mm, with a maximum not exceeding 0.1 mm. The rotor hollow shaft 19 can also be placed vertically under a hydraulic press, and the screw propeller is pressed into the rotor hollow shaft 19 to confirm that the screw propeller is in place accurately. First, perform a dynamic balance test, and then use the weld bead to find the balance. The principle of selecting the weld bead position is to use the weight of the weld bead itself as the adjustment balance point, and the two ends of the spiral blade 16 are welded to the inner wall of the rotor hollow shaft 19 in sections.

[0025] According to the disclosure and teachings of the above specification, those skilled in the art of the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A water pumping device using a hollow shaft of a motor rotor, comprising an upper shell (4), a lower shell (7) with a base (8), a left end cover (2), a right end cover (5), a bearing (10), a stator, a rotor and a water inlet sealing sleeve (6) provided with a sealing ring (14), characterized in that: It also includes a rotor hollow shaft (19) and a screw propeller. The rotor hollow shaft (19) is installed in the left end cover (2) and the right end cover (5) through a bearing (10). The screw propeller is fixed to the inner wall of the rotor hollow shaft (19). The water inlet sealing sleeve (6) is sealed with the water inlet end of the rotor hollow shaft (19) through a sealing ring (14).

2. A water pumping device using a hollow shaft of a motor rotor according to claim 1, characterized in that: The material of the stator iron core (12) and the rotor iron core (13) are both high silicon steel, and the material of the rotor hollow shaft (19) is stainless steel.

3. A water pumping device using a hollow shaft of a motor rotor according to claim 2, characterized in that: The screw propeller comprises a central shaft (15) and a plurality of continuous spiral blades (16); the central shaft (15) passes through a central hole of the spiral blade (16) and is fixedly connected; the outer periphery of the spiral blade (16) is fixedly connected to the inner wall of a hollow rotor shaft (19).

4. A water pumping device using a hollow shaft of a motor rotor according to claim 3, characterized in that: The upper shell (4) and the lower shell (7) are both provided with butt joint flanges (9) on the front and rear sides, and the butt joint flanges (9) are butt jointed by bolts.

5. A water pumping device using a hollow shaft of a motor rotor according to claim 4, characterized in that: It also includes a water outlet sealing sleeve (1) provided with a sealing ring (14), the water inlet sealing sleeve (6) and the water outlet sealing sleeve (1) are both provided with a bottom plate (17), the bottom plate (17) is provided with a center hole, the sealing ring (14) is installed in the center hole, the outer ends of the left end cover (2) and the right end cover (5) are both provided with a step hole (18), the water inlet sealing sleeve (6) and the water outlet sealing sleeve (1) are symmetrically installed in the left and right step holes (18) and are sealedly connected to the two ends of the rotor hollow shaft (19) through the sealing ring (14).

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