Permanent magnet full cross-flow submersible pump

Abstract

The permanent magnet full-cross-flow submersible pump comprises a water suction cover, an impeller rotor assembly, a stator assembly and a water drainage cover, and the impeller rotor assembly is provided with an isolation cylinder which is rotatably arranged between the stator assembly and the water drainage cover; a plurality of blades which are rotatably connected with the wheel shaft through the wheel carrier are distributed in the isolation cylinder in a surrounding mode, a motor rotor is arranged outside the isolation cylinder, the stator assembly is provided with a machine shell, the two ends of the machine shell are fixed to the stator assembly and the drainage cover respectively, and a stator iron core arranged outside the motor rotor in a sleeving mode is installed in the machine shell. A stator coil connected to a power supply through a cable is wound outside the stator iron core, so that the power factor is high, and the influence of iron-containing impurities in water is not easily caused.

Description

[Technical field]

[0001] The present invention relates to the technical field of through-flow pumps, in particular to the technical field of full-through-flow pumps. [Background technology]

[0002] A tubular pump is a low-lift horizontal axial flow pump, which is approximately straight cylindrical in shape, and the inlet and outlet water channels are located on the same straight line. It has the characteristics of low hydraulic loss, high water lifting efficiency, compact structure, convenient maintenance and installation, and simple pump station engineering, and has been widely used. Full-tubular pumps, such as a stable and reliable submersible full-tubular pump announced by the utility model with announcement number CN215256860U, a conveniently installed full-tubular pump announced by the utility model with announcement number CN213574638U, and a new full-tubular pump with auxiliary blades announced by the utility model with announcement number CN212202489U, as a type of tubular pump, have the most prominent feature that the motor stator is integrated with the water pump housing, the motor rotor is integrated with the water pump impeller, and the submersible motor is placed outside the water pump impeller. With this design, after the three-phase AC is supplied to the motor stator, the rotor with the built-in impeller can start to rotate under the action of the rotating magnetic field, and the water will pass through the suction chamber, impeller and pressure chamber in sequence under the action of the impeller and finally be directly discharged. Since the working water of the full-flow pump flows through the inner cavity of the submersible motor rotor (straight in and straight out, smooth flow), it has good hydraulic performance and high device efficiency.

[0003] However, the traditional full-flow submersible pump directly uses a three-phase asynchronous motor to provide power, which has the problem of low power factor (especially at low speed, the power factor will be even lower). In addition, the existing full-flow submersible pumps on the market use a wet stator structure design, which causes the motor to be completely immersed in water. There is a problem that iron impurities in the water enter the machine cavity and have a negative impact on the performance of the motor. [Summary of the invention]

[0004] The purpose of the present invention is to solve the problems in the prior art and to provide a permanent magnet full-flow submersible pump which has a high power factor and is not easily affected by iron impurities in water.

[0005] To achieve the above-mentioned purpose, the present invention proposes a permanent magnet full-flow submersible pump, including a water suction hood, an impeller-rotor assembly, a stator assembly and a drainage hood, the impeller-rotor assembly having an isolation cylinder rotatably arranged between the stator assembly and the drainage hood, a plurality of blades rotatably connected to the wheel axle through a wheel frame are distributed inside the isolation cylinder, and a motor rotor is arranged outside the isolation cylinder, the stator assembly has a casing with two ends respectively fixed to the stator assembly and the drainage hood, a stator core sleeved outside the motor rotor is installed in the casing, and a stator coil connected to a power supply through a cable is wound outside the stator core.

[0006] Preferably, the water absorption hood includes a water absorption base tube, a water absorption base and water absorption ribs, and the water absorption base is fixed to the inside of the water absorption base tube by a plurality of water absorption ribs. The drainage hood includes a drainage base tube, a drainage base and drainage ribs, and the drainage base is fixed to the inside of the drainage base tube by a plurality of drainage ribs. The two ends of the wheel axle are respectively plugged into the water absorption base and the drainage base. The water absorption base tube, the isolation tube, the casing and the drainage base tube together surround a cavity that can accommodate the motor rotor, the stator core and the stator coil, and the cable passes through the cavity along the casing.

[0007] Preferably, the end of the water absorption base tube facing the water inlet side is provided with a flared portion which gradually opens from the inside to the outside, the drainage base tube is in a trumpet shape which gradually expands from the water inlet side to the water outlet side, and the end of the water absorption base facing the water inlet side and the end of the drainage base facing the water outlet side are respectively provided with a water absorption guide cone head and a drainage guide cone head which gradually shrink from the inside to the outside.

[0008] Preferably, a water absorption magnet and a drainage magnet are installed at one end of the water absorption base tube facing the water inlet side and one end of the drainage base tube facing the water outlet side, respectively.

[0009] Preferably, the isolation cylinder is made of a material having magnetic shielding properties.

[0010] Preferably, the cable core of the cable is filled with sealing filler, each wire core of the cable core is respectively covered with a sealing sleeve, a transverse tube for blocking capillary leakage is provided between each core wire of the wire core and a sealing tape is wrapped around the outside.

[0011] Preferably, the wheel frame includes a hub and a bearing, the wheel axle, the bearing and the hub are sleeved in sequence, the blades are fixed between the isolation cylinder and the hub, and the motor rotor and the isolation cylinder are detachable.

[0012] Preferably, a gland and a rotary seal are respectively installed between the wheel hub and the axle, and the wheel hub, the gland, the rotary seal and the axle together surround and form an oil cavity filled with lubricating oil that can wet the bearing.

[0013] Preferably, the rotary seal comprises a rotary seal dynamic ring, a rotary seal static ring and an elastic element, wherein the rotary seal dynamic ring is fixed on the pressure cover and can rotate with the motor rotor, the rotary seal static ring is fixed on the wheel axle and remains stationary together with the wheel axle, and the elastic element has an elastic tendency to push the rotary seal dynamic ring and the rotary seal static ring closer together.

[0014] Preferably, a dynamic ring auxiliary sealing ring is installed between the rotating seal dynamic ring and the pressure cover, and a static ring auxiliary sealing ring is installed between the rotating seal static ring, the elastic element and the wheel axle.

[0015] Beneficial effects of the present invention:

[0016] 1) The impeller rotor assembly and stator assembly of the present application adopt a permanent magnet wet stator motor design, which has the characteristics of high working efficiency (generally above 95%) and high power factor (generally above 0.9, while ordinary motors with more than 20 poles generally have a power factor below 0.7), and has significant advantages in energy conservation and emission reduction;

[0017] 2) The present application concentrates the center of gravity of the rotating parts and immerses the whole machine in water for operation, which can reduce its own vibration to avoid noise generation from the source as much as possible, and further reduce noise by using the damping effect of water on sound, and can reduce the noise to within 70 decibels during operation (the noise of traditional submersible pumps is generally above 80 decibels);

[0018] 3) The present application has no motor sealed chamber, which not only saves various water leakage protection devices, but also effectively avoids the harm of false alarms (the whole machine has a simple structure, fewer parts, and fewer fault points), and because the stator winding works immersed in water, it can provide strong overload capacity through efficient heat dissipation;

[0019] 4) The present application adds an isolation cylinder made of a material with magnetic shielding properties between the blades and the motor rotor, and installs a water-absorbing magnet and a water-draining magnet on the water-absorbing base cylinder and the water-draining base cylinder respectively to absorb iron impurities in the water. On the one hand, it can prevent the rotor from being adsorbed and on the other hand, it can also allow the cable to be directly drawn out from the cavity formed by the water-absorbing base cylinder, the isolation cylinder, the casing and the water-draining base cylinder, so that the cable does not pass through the flowing water pumped by the pump, effectively avoiding the impact and damage of the water flow and impurities in the water on the cable;

[0020] 5) The present application adopts a rotating seal dynamic ring, a rotating seal static ring, an elastic element, a dynamic ring auxiliary sealing ring and a static ring auxiliary sealing ring to form a rotating seal. The rotating seal can be used to achieve reliable rotating sealing at both ends of the wheel hub, thereby preventing water from entering the wheel hub and affecting the bearing life.

[0021] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the permanent magnet full-throughflow submersible pump of the present invention;

[0023] Figure 2 It is a cross-sectional view of the impeller rotor assembly of the permanent magnet full-throughflow submersible pump of the present invention;

[0024] Figure 3 It is a schematic diagram of the assembly of the gland, the seal and the axle of the permanent magnet full-throughflow submersible pump of the present invention;

[0025] Figure 4It is a cross-sectional view of the stator assembly of the permanent magnet full-flow submersible pump of the present invention.

[0026] In the figure: 1-water absorption cover, 11-water absorption base cylinder, 111-expanding part, 12-water absorption base, 121-water absorption guide cone head, 13-water absorption ribs, 14-water absorption magnet, 2-impeller rotor assembly, 21-motor rotor, 22-isolation cylinder, 23-blade, 24-wheel frame, 241-wheel hub, 242-bearing, 243-pressure cover, 244-seal, 2441-rotating seal dynamic ring, 2442-rotating sealing static ring, 2443-elastic element, 2444-dynamic ring auxiliary sealing ring, 2445-static ring auxiliary sealing ring, 25-axle, 3-stator assembly, 31-casing, 32-stator core, 33-stator coil, 34-cable, 4-drainage cover, 41-drainage base tube, 42-drainage base, 421-drainage guide cone head, 43-drainage ribs, 44-drainage magnet. [Specific implementation method]

[0027] See also Figures 1 to 4 The permanent magnet full-flow submersible pump of the present invention comprises a water suction cover 1, an impeller rotor assembly 2, a stator assembly 3 and a drainage cover 4, wherein the impeller rotor assembly 2 has an isolation cylinder 22 rotatably arranged between the stator assembly 3 and the drainage cover 4, wherein the isolation cylinder 22 has a plurality of blades 23 rotatably connected to the wheel shaft 25 through a wheel frame 24, and a motor rotor 21 is arranged outside the isolation cylinder 22, wherein the stator assembly 3 has a housing 31 whose two ends are respectively fixed to the stator assembly 3 and the drainage cover 4, wherein a stator iron core 32 sleeved outside the motor rotor 21 is installed in the housing 31, and a stator coil 33 connected to a power supply through a cable 34 is wound outside the stator iron core 32. This structure can not only effectively shorten the axial dimension of the whole machine (the axial dimension of the whole machine is only one-third of that of a traditional water pump), and improve the assembly efficiency of the whole machine, but also because the water inlet and the water outlet are respectively located at the two ends of the axial direction, the water can flow in and out directly, and the loss of water blocking of the traditional motor can be effectively avoided. In addition, since the water absorption cover 1 and the drainage cover 4 can support the impeller rotor assembly 2 at both ends and form a double-beam structure, the impeller rotor assembly 2 can be ensured to maintain stable operation during operation to avoid the hazard of the impeller falling. For the impeller rotor assembly 2 and the stator assembly 3, during operation, the stator coil 33 can generate a rotating magnetic field under the excitation of alternating current (a number of high-quality permanent magnets for generating a stable magnetic field are installed at the inner circumference of the motor rotor 21), and the permanent magnets can cause the motor rotor 21 to rotate relative to the stator core 32 and the stator coil 33 under the action of the rotating magnetic field.

[0028] The water absorption cover 1 includes a water absorption base tube 11, a water absorption base 12 and a water absorption rib sheet 13. The water absorption base 12 is fixed inside the water absorption base tube 11 through a plurality of water absorption rib sheets 13. The drainage cover 4 includes a drainage base tube 41, a drainage base 42 and a drainage rib sheet 43. The drainage base 42 is fixed inside the drainage base tube 41 through a plurality of drainage rib sheets 43. The two ends of the wheel axle 25 are respectively plugged with the water absorption base 12 and the drainage base 42. The water absorption base tube 11, the isolation tube 22, the housing 31 and the drainage base tube 41 together surround and form a cavity that can accommodate the motor rotor 21, the stator core 32 and the stator coil 33. The cable 34 passes through the cavity along the housing 31. Among them, the water absorption rib sheet 13 and the drainage rib sheet 43 can support the water absorption base 12 and the drainage base 42 respectively, and the drainage rib sheet 43 can also be used to eliminate the rotation of water to reduce power loss. In addition, a shell flange is provided on the casing 31, and a water absorption flange and a drainage flange which can be threadedly connected to the shell flange by fasteners are provided on the water absorption base tube 11 and the drainage base tube 41 respectively; a lifting lug and a wire outlet hole for the cable 34 to pass through can also be installed on the top of the casing 31, and a base or roller for fixing can be installed below the casing 31; the stator core 32 can be installed in the casing 31 by press-fitting; the stator coil 33 uses a wet coil whose insulating layer is made of polymer material and can be immersed in water to work; a keyway can be added on the water absorption base 12 to use a key to assist in reinforcing the wheel axle 25.

[0029] The end of the water-absorbing base tube 11 facing the water inlet side is provided with a flared portion 111 that gradually opens from the inside to the outside, and the drainage base tube 41 is in a trumpet shape that gradually expands from the water inlet side to the water outlet side. The end of the water-absorbing base 12 facing the water inlet side and the end of the drainage base 42 facing the water outlet side are respectively provided with a water-absorbing guide cone head 121 and a drainage guide cone head 421 that gradually shrink from the inside to the outside. Among them, the flared portion 111 can improve the water inlet flow state at the water inlet side (large water inlet, small water outlet), while the trumpet-shaped drainage base tube 41 can improve the water outlet flow state at the water outlet side (small water inlet, large water outlet); the water-absorbing guide cone head 121 and the drainage guide cone head 421 can guide the water flow when the water is inlet and the water is out, respectively.

[0030] The end of the water absorption base cylinder 11 facing the water inlet side and the end of the water drainage base cylinder 41 facing the water outlet side are respectively equipped with a water absorption magnet 14 and a water drainage magnet 44. The water absorption magnet 14 and the water drainage magnet 44 can absorb iron impurities in the water at the water inlet side and the water outlet side respectively.

[0031] The isolation cylinder 22 is made of a material with magnetic shielding properties, such as stainless steel. Specifically, the isolation cylinder 22 can shield the inward magnetism of the permanent magnet from the motor rotor 21, thereby avoiding the adsorption of iron-containing impurities inside the isolation cylinder 22, effectively preventing the iron-containing impurities from rotating with the impeller rotor assembly 2 and passing through the gap (located between the isolation cylinder 22 and the water absorption base cylinder 11 and between the isolation cylinder 22 and the drainage base cylinder 41) to damage the stator coil 33, and can also avoid the damage of the motor rotor 21 to a certain extent due to impeller cavitation.

[0032] The cable core of the cable 34 is filled with sealing fillers (such as rubber fillers), each wire core of the cable core is respectively covered with a sealing sleeve (such as a vulcanized rubber sleeve), and a transverse tube (such as a copper tube) that can block capillary leakage is provided between each core wire of the wire core, and a sealing tape (such as an insulating self-adhesive tape) is wrapped around the outside. In other words, the cable 34 adopts three layers of waterproof measures, and the waterproof effect is better, which can effectively ensure the safe operation of the whole machine.

[0033] The wheel frame 24 includes a wheel hub 241 and a bearing 242, the wheel shaft 25, the bearing 242 and the wheel hub 241 are sleeved in sequence, the blades 23 are fixed between the isolation cylinder 22 and the wheel hub 241 (can be fixed by welding), and the motor rotor 21 and the isolation cylinder 22 can be disassembled (a key can be used to achieve a detachable connection between the two). In addition, the part where the wheel hub 241 and the blades 23 are fixed can also be removed from the main body of the wheel hub 241 (such as using fasteners to achieve a detachable connection between the two). With such a design, when replacing the impeller, the motor rotor 21 does not need to be replaced synchronously.

[0034] A pressure cover 243 and a rotary seal 244 are respectively installed between the wheel hub 241 and the wheel axle 25 . The wheel hub 241 , the pressure cover 243 , the rotary seal 244 and the wheel axle 25 together surround and form an oil cavity filled with lubricating oil that can wet the bearing 242 .

[0035] The rotating seal 244 includes a rotating seal dynamic ring 2441, a rotating seal static ring 2442 and an elastic element 2443. The rotating seal dynamic ring 2441 is fixed on the pressure cover 243 and can rotate with the motor rotor 21. The rotating seal static ring 2442 is fixed on the axle 25 and remains stationary together with the axle 25. The elastic element 2443 has an elastic tendency to push the rotating seal dynamic ring 2441 and the rotating seal static ring 2442 closer to each other.

[0036] A dynamic ring auxiliary seal ring 2444 is installed between the rotating seal dynamic ring 2441 and the pressure cover 243 , and a static ring auxiliary seal ring 2445 is installed between the rotating seal static ring 2442 , the elastic element 2443 and the wheel shaft 25 .

[0037] Working process of the present invention:

[0038] During operation, the stator coil 33 is energized and cooperates with the stator core 32 to drive the motor rotor 21 to rotate, and each blade 23 rotates accordingly to make water flow into the water absorption cover 1 first and then flow out along the drainage cover 4.

[0039] In the present application, the impeller rotor assembly 2 and the stator assembly 3 adopt a permanent magnet synchronous motor design. Specifically, the cable 34 passes a three-phase symmetrical current into the stator coil 33 and generates a stator rotating magnetic field. The stator rotating magnetic field rotates relative to the rotor to generate current in the cage winding and form a rotor rotating magnetic field. The asynchronous torque generated by the interaction between the stator rotating magnetic field and the rotor rotating magnetic field can accelerate the motor rotor 21 from static. In this process, the rotor permanent magnetic field and the stator rotating magnetic field have different speeds, which will generate an alternating torque. When the motor rotor 21 accelerates to a speed close to the synchronous speed, the speeds of the rotor permanent magnetic field and the stator rotating magnetic field are close to the same, and the stator rotating magnetic field speed is slightly greater than the rotor permanent magnetic field. They interact with each other to generate torque to pull the motor rotor 21 into a synchronous operation state. In the synchronous operation state, no current is generated in the rotor winding. At this time, only the permanent magnet on the motor rotor 21 generates a magnetic field, and it interacts with the stator rotating magnetic field and generates a driving torque. That is to say, the permanent magnet synchronous motor is started by the asynchronous torque of the rotor winding, and after the start-up is completed, the rotor winding no longer works, and the magnetic field generated by the permanent magnet and the stator winding interacts to generate the driving torque. This permanent magnet synchronous motor design usually has a higher efficiency (under the same power, the operating efficiency of the permanent magnet synchronous motor is often higher than that of the traditional motor) because it eliminates the excitation loss, and has significant advantages in energy saving and emission reduction.

[0040] For the rotary seal 244, the elastic element 2443 can use elastic force to make the rotary seal dynamic ring 2441 and the rotary seal static ring 2442 rotate synchronously and relatively under the condition of keeping relative fit during operation. Under the action of the medium fluid, the rotary seal dynamic ring 2441 and the rotary seal static ring 2442 can form an extremely thin medium liquid film to achieve axial sealing, thereby preventing water from entering the oil chamber and damaging the bearing 242. The elastic element 2443 mainly uses elasticity to compensate and adjust the rotary seal dynamic ring 2441 and the rotary seal static ring 2442. Specifically, if the rotary seal dynamic ring 2441 and the rotary seal static ring 2442 produce a small amount of wear after running for a period of time, the elastic element 2443 can prevent the leakage of the medium liquid through the function of automatic elastic adjustment (if the worn sealing end surface between the rotary seal dynamic ring 2441 and the rotary seal static ring 2442 is not pressed in time, it will cause sealing failure).

[0041] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Permanent magnet full-flow submersible pump, characterized by: The invention comprises a water absorption cover (1), an impeller rotor assembly (2), a stator assembly (3) and a drainage cover (4). The impeller rotor assembly (2) comprises an isolation cylinder (22) rotatably arranged between the stator assembly (3) and the drainage cover (4). A plurality of blades (23) rotatably connected to a wheel shaft (25) are distributed in a surrounding manner inside the isolation cylinder (22), and a motor rotor (21) is arranged outside the isolation cylinder. The stator assembly (3) comprises a casing (31) with two ends respectively fixed to the stator assembly (3) and the drainage cover (4). A stator core (32) sleeved outside the motor rotor (21) is installed in the casing (31), and a stator coil (33) connected to a power source through a cable (34) is wound outside the stator core (32).

2. The permanent magnet full-flow submersible pump according to claim 1, characterized in that: The water absorption cover (1) comprises a water absorption base tube (11), a water absorption base (12) and a water absorption rib sheet (13); the water absorption base (12) is fixed inside the water absorption base tube (11) by means of a plurality of water absorption rib sheets (13); the drainage cover (4) comprises a drainage base tube (41), a drainage base (42) and a drainage rib sheet (43); the drainage base (42) is fixed inside the drainage base tube (41) by means of a plurality of drainage rib sheets (43); the two ends of the wheel axle (25) are respectively plugged into the water absorption base (12) and the drainage base (42); the water absorption base tube (11), the isolation tube (22), the casing (31) and the drainage base tube (41) together surround a cavity that can accommodate a motor rotor (21), a stator core (32) and a stator coil (33); the cable (34) passes through the cavity along the casing (31).

3. The permanent magnet full-flow submersible pump according to claim 2, characterized in that: The end of the water absorption base tube (11) facing the water inlet side is provided with a flared portion (111) which gradually opens from the inside to the outside, the drainage base tube (41) is in the shape of a trumpet which gradually expands from the water inlet side to the water outlet side, and the end of the water absorption base (12) facing the water inlet side and the end of the drainage base (42) facing the water outlet side are respectively provided with a water absorption guide cone head (121) and a drainage guide cone head (421) which gradually shrink from the inside to the outside.

4. The permanent magnet full-flow submersible pump according to claim 2, characterized in that: A water absorption magnet (14) and a drainage magnet (44) are respectively installed on one end of the water absorption base cylinder (11) facing the water inlet side and one end of the drainage base cylinder (41) facing the water outlet side.

5. The permanent magnet full-flow submersible pump according to claim 4, characterized in that: The isolation cylinder (22) is made of a material having magnetic shielding properties.

6. The permanent magnet full-flow submersible pump according to claim 2, characterized in that: The cable core of the cable (34) is filled with sealing filler, each wire core of the cable core is respectively covered with a sealing sleeve, and a transverse tube capable of blocking capillary leakage is arranged between each core wire of the wire core, and a sealing tape is wrapped around the outside.

7. The permanent magnet full-flow submersible pump according to claim 1, characterized in that: The wheel frame (24) comprises a wheel hub (241) and a bearing (242); the wheel shaft (25), the bearing (242) and the wheel hub (241) are sleeved in sequence; the blades (23) are fixed between the isolation cylinder (22) and the wheel hub (241); and the motor rotor (21) and the isolation cylinder (22) are detachable.

8. The permanent magnet full-flow submersible pump according to claim 7, characterized in that: A pressure cover (243) and a rotary seal (244) are respectively installed between the wheel hub (241) and the wheel axle (25); the wheel hub (241), the pressure cover (243), the rotary seal (244) and the wheel axle (25) together surround an oil cavity filled with lubricating oil that can wet the bearing (242).

9. The permanent magnet full-flow submersible pump according to claim 8, characterized in that: The rotating seal (244) comprises a rotating seal dynamic ring (2441), a rotating seal static ring (2442) and an elastic element (2443); the rotating seal dynamic ring (2441) is fixed on the pressure cover (243) and can rotate along with the motor rotor (21); the rotating seal static ring (2442) is fixed on the wheel axle (25) and remains stationary together with the wheel axle (25); and the elastic element (2443) has an elastic tendency to push the rotating seal dynamic ring (2441) and the rotating seal static ring (2442) closer together.

10. The permanent magnet full-flow submersible pump according to claim 9, characterized in that: A dynamic ring auxiliary seal ring (2444) is installed between the rotating seal dynamic ring (2441) and the pressure cover (243), and a static ring auxiliary seal ring (2445) is installed between the rotating seal static ring (2442), the elastic element (2443) and the wheel shaft (25).

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