CN206302314U - A three-phase asynchronous variable frequency motor for main pump - Google Patents

Abstract

A kind of phase asynchronous variable-frequency motor of main pump, including support, rotor and stator are provided with support, the inside of rotor is coaxially provided with rotating shaft, the upper and lower ends of rotating shaft are connected by upper end bearing and bottom end bearing with support respectively, the circular gear platform for located stator position is provided with below stator, the first arc bond for located stator position is provided with above stator, rotor gear platform is fixedly installed below rotor, the second arc bond for fixed rotor is provided with above rotor, the first cavity oil storage tank is provided with the enclosing cover of bottom end bearing, the second cavity oil storage tank is provided with the inner cap of upper end bearing, the 3rd cavity oil storage tank is provided with the enclosing cover of upper end bearing.The utility model provides a kind of phase asynchronous adjustable frequency motor of main pump, and motor operation is steady, can effectively reduce vibration and noise, and long-term safety is effectively run.

Description

A three-phase asynchronous variable frequency motor for main pump

technical field

The utility model relates to the field of motors, in particular to a three-phase asynchronous variable-frequency motor for a main pump.

Background technique

The stator of the existing motor adopts the interference fit between the base and the stator core. For a vertical motor with the shaft extending downward, the stator core will gradually slide down after long-term operation of the motor, resulting in misalignment of the stator and rotor or uneven air gap, causing motor vibration, noise etc. The rotation of the rotor will inevitably generate vibration, which will cause the change of the air gap and cause electromagnetic vibration, which is then transmitted to the housing through the bearing and the end cover. The inner and outer cover oil storage tanks in the motor bearing device are small, and a special design is required for motors that cannot be maintained with waste oil for long-term operation. A vertical motor with an inertial flywheel on the shaft extension will generate a large axial force and radial force when the motor is running, which is easy to damage the bearing. The main pump motor is the key motor equipment of a large power station, which must ensure long-term, reliable and safe operation.

The application number is 201510928673.8, which discloses a low-temperature rising high-voltage flameproof three-phase asynchronous motor, which includes a machine base, a rotor and a stator are arranged inside the machine base, and front-end covers connected to the machine base are respectively provided at the front and rear ends of the rotor. and the rear end cover, the center of circle of the rotor and stator is lower than the center of circle of the base; the base is provided with a cooling pipe area, and the cooling pipe area is provided with cooling pipes passing through the two ends of the base, and the cooling pipe is connected to the base The central axes of the rotor and the stator are parallel, and the cooling pipe area includes a first cooling pipe area and a second cooling pipe area; the first cooling pipe area is composed of multi-layered cooling pipes arranged concentrically around the stator; the second cooling pipe area It is arranged on the upper part of the first cooling pipe area, which is composed of cooling pipes arranged in multiple layers in an arc shape around the stator; the rotor is located at one end of the rear end cover and an external fan is installed, and the machine base is located at one end of the rear end cover A windshield is provided, and the outer fan is arranged on the windshield, and the outer fan and the windshield are sealed and overlapped by a suction nozzle; Explosion-proof joint surface; the rotor and the front end cover are rotationally connected through the front bearing, and the joint surfaces of the front bearing and the rotor and the front end cover are all set as explosion-proof joint surfaces, and the rotor and the rear end cover are connected through the rear bearing Rotationally connected, the joint surfaces of the rear bearing, the rotor and the rear end cover are all set as flameproof joint surfaces. This utility model cannot solve the actual work requirements of the main pump motor of the key motor equipment of large-scale power stations, and vibration and noise will be generated during the working process, which cannot guarantee the long-term reliable and safe operation of the motor.

Contents of utility models

In order to solve the problems in the prior art, the utility model provides a three-phase asynchronous frequency conversion motor for a main pump. The motor runs smoothly, can effectively reduce vibration and noise, and can run safely and effectively for a long time.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a three-phase asynchronous frequency conversion motor for a main pump, including a frame, a rotor and a stator are arranged in the frame, a rotating shaft is coaxially arranged inside the rotor, and the rotor and the rotating shaft Interference fit, the upper and lower ends of the rotating shaft are connected to the machine base through the upper end bearing and the lower end bearing respectively, and the stator is fixedly connected to the machine base through screws. The stand is fixedly connected with the machine base, the first arc key for positioning the position of the stator is arranged above the stator, the first arc key is fixedly connected with the machine base, the rotor stop is fixedly arranged at the bottom of the rotor, and the rotor The stopper is fixedly connected with the rotating shaft, the second arc key for fixing the rotor is arranged above the rotor, the second arc key is fixedly connected with the rotating shaft, and the outer cover of the lower end bearing is provided with a first cavity oil storage tank , the inner cover of the upper end bearing is provided with a second cavity oil storage tank, the outer cover of the upper end bearing is provided with a third cavity oil storage tank, the first cavity oil storage tank, the second cavity oil storage tank , The oil storage tank of the third cavity is provided with an oil hole on one side close to the rotating shaft. The circular block and the first arc key can prevent the stator core from slipping in the axial and radial directions, and can also improve the heat conduction capacity and the overall anti-vibration performance. The rotor block and the second arc key can prevent the axial movement of the rotor. The occurrence of displacement improves the overall anti-seismic performance of the motor. Compared with the existing oil storage tanks, the first, second and third cavity oil storage tanks have larger volumes, which increase the oil storage capacity, make the motor run smoothly, and effectively reduce vibration and noise.

Preferably, an inertia flywheel is provided at the shaft extension end of the rotating shaft.

Preferably, a plurality of circular grooves are provided on the shaft holes where the upper end bearing and the lower end bearing cooperate with the rotating shaft. Such setting can improve the oil storage capacity and axial load resistance capacity of the whole bearing device.

Preferably, the inertia flywheel is in interference fit with the shaft extension end.

Preferably, the side of the inertia flywheel that cooperates with the rotating shaft is set as a conical surface, and a conical ring is fitted on the conical surface to cooperate with it.

As a preference, a fixing plate for fixing the inertia flywheel is provided on the rotating shaft near the shaft extension end of the inertia flywheel, and an axial bolt is pierced on the fixing plate, and one end of the axial bolt tightens the inertia flywheel, and the Radial bolts for fixing the inertia flywheel are arranged on the radial frame of the inertia flywheel, and the radial bolts pass through the frame to tighten the inertia flywheel. The two ends are positioned by the tapered ring, and the flywheel is provided with axial bolts and radial bolts at the same time, which can ensure that the flywheel is stable and does not rotate during transportation.

Preferably, the rotor is an aluminum casting rotor. The aluminum casting rotor is easy to process, and it is convenient to take process quality control on the rotor parts and reduce the unbalance.

Through the above settings, the motor is guaranteed to run smoothly, vibration and noise are effectively reduced, and the long-term safe and effective operation of the motor is guaranteed. By adding axial bolts and radial bolts to the flywheel, it is ensured that the flywheel is stable and does not rotate during transportation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural schematic diagram of place A in Fig. 1;

Fig. 3 is a schematic structural diagram of the inertial flywheel in Fig. 1 .

detailed description

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

A three-phase asynchronous variable frequency motor for main pumps as shown in Figures 1 to 3, includes a base 1, a rotor 2 and a stator 3 are arranged inside the base 1, and a rotating shaft 4 is coaxially arranged inside the rotor 2. This implementation The rotor 2 of the example is an aluminum casting rotor, which is easy to process, and is convenient to take process quality control on the parts of the rotor 2 and reduce the unbalance. The upper and lower ends of the rotating shaft 4 are respectively connected to the machine base 1 through the upper end bearing 5 and the lower end bearing 6, the stator 3 is fixedly connected to the machine base 1 through screws, and a circular block 7 for positioning the position of the stator 3 is arranged under the stator 3 , the circular block 7 is fixedly connected with the machine base 1, the first arc key 8 for positioning the position of the stator 3 is arranged above the stator 3, the first arc key 8 is fixedly connected with the machine base 1, and the bottom of the rotor 2 is fixed A rotor block 9 is provided, and the rotor block 9 is fixedly connected to the rotating shaft 4. A second arc key 10 for positioning the rotor 2 is arranged above the rotor 2. The second arc key 10 is fixedly connected to the rotating shaft 4. In this embodiment The second arc key 10 is welded with the rotating shaft 4, the outer cover of the lower end bearing 6 is provided with a first cavity oil storage tank 11, the inner cover of the upper end bearing 5 is provided with a second cavity oil storage tank 12, and the outer cover of the upper end bearing 5 is provided with a second cavity oil storage tank 12. The cover is provided with a third cavity oil storage tank 13, the first cavity oil storage tank 11, the second cavity oil storage tank 12, and the third cavity oil storage tank 13 have an oil hole 23 on one side close to the rotating shaft 4, and the shaft of the rotating shaft 4 Stretching end is provided with inertial flywheel 14. This setting can prevent the stator 3 core from slipping in the axial and radial directions, the rotor block 9 and the second arc key 10 can prevent the axial displacement of the rotor 2, and improve the overall anti-vibration performance of the motor. This embodiment Compared with the existing oil storage tanks, the first, second, and third cavity oil storage tanks have larger volumes, which increase the oil storage capacity, make the motor run smoothly, and effectively reduce vibration and noise.

A plurality of circular grooves 22 are arranged on the shaft holes where the upper end bearing 5 and the lower end bearing 6 cooperate with the rotating shaft 4, so that the oil storage capacity and axial load resistance capacity of the entire bearing device can be improved.

In this embodiment, the inertia flywheel 14 is in interference fit with the shaft end, and the side of the inertia flywheel 14 that cooperates with the rotating shaft 4 is set as a conical surface 17, and a conical ring 18 is mounted on the conical surface 17 in cooperation with it. The inertia flywheel 14 is provided with a fixed plate 19 for fixing the inertia flywheel 14 on the rotating shaft 4 near the shaft extension end. The fixed plate 19 is pierced with an axial bolt 20, and one end of the axial bolt 20 is pressed against the inertia flywheel 14, and then The position of the inertial flywheel 14 can be fixed during transportation. The radial frame 1 of the inertial flywheel 14 is provided with radial bolts 21 for fixing the inertial flywheel 14. The radial bolts 21 pass through the frame 1 to tighten the flywheel. During transportation 1. Lock the flywheel 14 with axial bolts 20 and radial bolts 21 to ensure that the flywheel is stable and does not rotate during transportation.

What is described above is only the embodiment of the utility model, and common knowledge such as the specific structure and characteristics known in the scheme are not described too much here. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the utility model, some deformations and improvements can also be made, and these should also be regarded as the protection scope of the utility model, and these will not affect the utility model. Effects of utility model implementation and practicability of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (7)

1. a kind of phase asynchronous variable-frequency motor of main pump, including support, is provided with rotor and stator in support, the inside of rotor is same Axle is provided with rotating shaft, rotor and rotating shaft interference fit, and the upper and lower ends of rotating shaft pass through upper end bearing and bottom end bearing and support respectively It is connected, it is characterised in that：The stator is fixedly connected by screw with support, is provided with for located stator below stator The circular gear platform of position, circle gear platform is fixedly connected with support, and first for located stator position is provided with above stator Arc bond, the first arc bond is fixedly connected with support, and rotor gear platform is fixedly installed below the rotor, and the rotor keeps off platform It is fixedly connected with rotating shaft, the second arc bond for fixed rotor, the second arc bond and rotating shaft is provided with above the rotor It is fixedly connected, the first cavity oil storage tank is provided with the enclosing cover of the bottom end bearing, is provided with the inner cap of the upper end bearing Second cavity oil storage tank, is provided with the 3rd cavity oil storage tank, the first cavity oil storage tank, at the enclosing cover of the upper end bearing Two cavity oil storage tanks, the 3rd cavity oil storage tank are provided with oilhole near the one side of rotating shaft.

2. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 1, it is characterised in that：The shaft extension of the rotating shaft End is provided with inertial flywheel.

3. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 1, it is characterised in that：The upper end bearing and Multiple circular troughs are provided with the axis hole that bottom end bearing coordinates with rotating shaft.

4. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 2, it is characterised in that：The inertial flywheel with Axle stretch end interference fit.

5. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 4, it is characterised in that：The inertial flywheel with The one side that rotating shaft coordinates is arranged to the conical surface, coordinates with it on the conical surface and is provided with conical ring.

6. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 5, it is characterised in that：The inertial flywheel is leaned on The fixed plate for fixing inertial flywheel is provided with the rotating shaft of nearly axle stretch end side, axial spiral shell is equipped with the fixed plate Bolt, one end of axial bolts holds out against inertial flywheel, is provided with for fixing inertial flywheel on the support of the inertial flywheel radial direction Radial bolts, radial bolts hold out against inertial flywheel through support.

7. the phase asynchronous variable-frequency motor of a kind of main pump according to claim 1, it is characterised in that：Described rotor is aluminium Casting rotor.