CN107276305B

CN107276305B - Rotor braking device

Info

Publication number: CN107276305B
Application number: CN201710416166.5A
Authority: CN
Inventors: 李玩幽; 刘伟; 卢熙群; 黄建哲; 乐帅; 陈美龙
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2017-06-06
Filing date: 2017-06-06
Publication date: 2020-05-15
Anticipated expiration: 2037-06-06
Also published as: CN107276305A

Abstract

The invention discloses a rotor braking device, which comprises an iron cylinder, an electromagnet and an annular bracket, wherein the iron cylinder is provided with a first end and a second end; the electric measuring iron comprises electrician pure iron and a coil; the electrical pure iron is fixed on the axial cross section of the annular bracket, and the coil is wound on the electrical pure iron; the iron cylinder is arranged on the rotor and faces one side of the electromagnet; the annular support is fixed in the base, and the pivot is located annular channel of annular support. The invention has novel structure, simple integral structure, convenient processing and installation on equipment, and can quickly brake.

Description

Rotor braking device

Technical Field

The invention belongs to the field of rotating machinery, and particularly relates to a rotor braking device.

Background

The rotor is mostly a rotating part in power machinery and working machinery and has the function of outputting torque; typical rotors include motor rotors, rotors for various pumps, disk-like structures, rotors for turbo compressors, and the like. The rotating speed of the rotor structure is often very high when the rotor structure operates, and after the rotor is stopped, the rotor structure can still be in a working state or a semi-working state due to the inertia of the rotor structure. In order to enable the rotor structure to be stopped for maintenance and provide sufficient time for replacing power elements, the rotor structure needs to be stopped quickly; for example, in a thermal power generation enterprise, a boiler induced draft fan often generates unbalanced mass of a rotor caused by abrasion of blades, so that the vibration of the induced draft fan exceeds the standard, and the safe and stable operation of a generator set is influenced, so that the induced draft fan is often required to be subjected to dynamic balance treatment on site, and the induced draft fan needs to be subjected to dynamic balance work mostly and needs to be repaired, so that a rotor braking device needs to be designed. Also, for example, the rotor driving the turbine to rotate needs to be provided with a rotor brake device for preventing the rotor from continuing to rotate after the engine is stopped.

In recent years, the braking problem of the rotor structure has been studied extensively. For example, a braking device for a rotor of a rotating device is proposed in (publication number CN203796800U), which includes a base, a jack, a steel column, a braking steel plate, and a polyester layer. The device is placed right below the rotor, the device is contacted with the rotor through the jack, and the rotor is braked by adjusting the friction force between the device and the rotor, but the device is not easy to actually operate and operators are easy to hurt; the patent (publication number CN201328046) proposes a braking device for a rotor of a disc brake motor, in which the rotor is in a disc shape, a ring-shaped friction plate is bonded to the back of the rotor, and the rotor and the ring-shaped friction plate are combined into a whole by a countersunk head screw, a compression spring is arranged in a central slot of an iron core of the rotor, a casing is fixed on a machine base, covers the rotor, and keeps a braking gap with the ring-shaped friction plate. The device has the advantages of novel structure, short axial dimension, flexible braking, accurate positioning and the like, but the manufacturing cost is relatively high, the stator structure is more complex and the mass is large. Conventional methods for rotor braking include tie-up braking, increased contact friction, etc., but these methods are not easy to operate, are risky, and are unsafe.

Disclosure of Invention

The invention aims to provide a rotor braking device which can realize rapid braking of a rotor, has a simple structure, is convenient to process and is convenient to install on equipment.

The purpose of the invention is realized as follows: comprises an iron cylinder, an electromagnet and an annular bracket; the electromagnet comprises electrician pure iron and a coil; the electrical pure iron is fixed on the axial cross section of the annular bracket, and the coil is wound on the electrical pure iron; the iron cylinder is arranged on the rotor and faces one side of the electromagnet; the annular bracket is fixed on the base, and the rotating shaft is positioned in an annular channel of the annular bracket;

the present invention may further comprise:

1. the iron cylinders are multiple and are uniformly distributed in a circumferential manner relative to the rotating center in the rotating plane of the rotor;

2. the number of the electromagnets is multiple; the electrician pure iron of the electromagnet is uniformly distributed on the axial cross section of the annular bracket in a circumference way relative to the center of the annular bracket.

3. The quantity of the electromagnets is equal to that of the iron cylinders, and the electrician pure iron mounting positions of the electromagnets are matched with the iron cylinders one by one.

The invention has the beneficial effects that:

the invention provides a rotor braking device, which can adjust the acting force between an electromagnet and a ferrous cylinder on a rotor only by changing the current in an electromagnet coil, and finally realize the rapid braking of the rotor 3. The invention has novel structure, simple integral structure, convenient processing and convenient installation on equipment.

Drawings

Fig. 1 is a schematic overall structure diagram of the device of the invention during a braking test.

Fig. 2 is a schematic view of the structure of the rotor and the ring support of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The invention provides a rotor braking device, which comprises an iron cylinder 4, an electromagnet and an annular bracket 7; the electromagnet comprises electrician pure iron 5 and a coil 6; the electrician pure iron 5 is fixed on the axial cross section of the annular bracket 7, and the coil 6 is wound on the electrician pure iron 5; the iron cylinder 4 is arranged on the rotor 3 and faces one side of the electromagnet; the annular bracket 7 is fixed on the base, and the rotating shaft is positioned in an annular channel of the annular bracket;

the iron cylinders are multiple and are uniformly distributed in a circumferential manner relative to the rotating center in the rotating plane of the rotor;

the quantity of the electromagnets is equal to that of the iron cylinders; the electrician pure iron of the electromagnet is uniformly distributed on the axial cross section of the annular bracket in a circumference way relative to the center of the annular bracket;

as shown in fig. 1, the rotor brake device proposed by the present invention was used for the test. The test device specifically includes: the device comprises a driving motor 1, a left end coupler 2, a rotor 3, an iron cylinder 4, electrician pure iron 5, a coil 6, an annular support 7, a rotating shaft 8, a right end coupler 9, a load motor 10, a base 11 and a fixed support 12. A left end coupling 2 is connected between the driving motor 1 and the rotor 3; the rotor 3 is connected with a load motor 10 through a right end coupling 9; the rotor 3 and the rotating shaft 8 are connected by a key. An iron cylinder 4 is connected to the rotor 3; the electrician pure iron 5 is fixed on the annular bracket 7, and a coil 6 is wound on the electrician pure iron 5 to form an electromagnet structure; the inner diameter of the annular bracket 7 is larger than the outer diameter of the shaft 8, and the annular bracket and the shaft are in non-contact; the whole rotor rack is arranged on the base 11; the annular support 7 is fixed on the base 11. A fixing support 12 is arranged below the driving motor 1 and the load motor 10, and the driving motor 1 and the load motor 10 are connected with the base 11 through the fixing support 12.

The device can adjust the acting force between the electromagnet structure and the rotor 3 only by changing the current of the coil 6 after being electrified, and finally realizes the rapid braking of the rotor 3. The invention has novel structure, simple integral structure, convenient processing and convenient installation on equipment.

With reference to fig. 1, the acting force between the electromagnet structure and the rotor 3 is adjusted by changing the current of the solenoid coil 6 after the circular bracket 7 is powered on, so as to realize the rapid braking of the rotor 3. When the driving motor 1 is suddenly stopped, the rotor 3 is in a gradual speed reduction state, and the iron cylinders 4 on the rotor 3 gradually rotate along with the rotor 3 in a speed reduction manner; the electrician pure iron 5 on the annular bracket 7 is right opposite to the iron cylinder 4 on the rotor 3; when the pure electric iron 5 on the annular bracket 7 is electrified, an electromagnet structure is formed, and the electromagnet structure generates a torsional force component on the iron cylinders 4 on the rotor 3 in the torsional direction, which is equivalent to that a pulling force pulls the iron cylinders 4; finally, the rotor 3 is braked rapidly.

The rotor 3 and the iron cylinder 4 can be connected by welding or threads, and the number of the iron cylinders 4 on the rotor 3 can be selected to be multiple.

The annular support 7 is fixed, and the annular support 7 is not in contact with the rotating shaft 8; the conducting wire of the coil 6 after being electrified can be led out from the annular bracket 7, and the phenomenon of stranded wires between the conducting wire and the annular bracket 7 is required to be avoided when the coil is used.

It should be noted that the above examples are only for illustrating the present invention and are not limited thereto. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.

Claims

1. The utility model provides a rotor arresting gear, includes driving motor, left end shaft coupling, rotor, iron cylinder, electrician's pure iron, coil, ring carrier, pivot, right-hand member shaft coupling, load motor, base and fixed bolster, its characterized in that: a left end coupling is connected between the driving motor and the rotor; the rotor is connected with the load motor through a right end coupler; the rotor and the rotating shaft are connected by a key; the rotor is connected with an iron cylinder; the electrician pure iron is fixed on the annular bracket, and a coil is wound on the electrician pure iron to form an electromagnet structure; the inner diameter of the annular bracket is larger than the outer diameter of the shaft, and the annular bracket and the shaft are in non-contact; the whole rotor rack is arranged on the base; the annular bracket is fixed on the base; a fixed bracket is arranged below the driving motor and the load motor, and the driving motor and the load motor are connected with the base through the fixed bracket;

the acting force between the electromagnet structure and the rotor is adjusted by changing the current of the spiral coil after the annular bracket is electrified, so that the rotor is quickly braked; when the driving motor is suddenly stopped, the rotor is in a gradual speed reduction state, and the iron cylinders on the rotor rotate along with the rotor in a gradual speed reduction manner; the electrician pure iron on the annular bracket is right opposite to the iron cylinder on the rotor; when the pure electric iron on the annular bracket is electrified, an electromagnet structure is formed, and the electromagnet structure generates a torsional force component in the torsional direction for a plurality of iron cylinders on the rotor, which is equivalent to that the iron cylinders are dragged by a pulling force; finally, the rotor is quickly braked;

the rotor is connected with the iron cylinders in a welding or threaded mode, and the number of the iron cylinders on the rotor is selected to be multiple;

the annular support is fixed and is not in contact with the rotating shaft; the conducting wire of the coil after being electrified can be led out from the annular support, and the phenomenon of stranded wires between the conducting wire and the annular support needs to be avoided when the coil is used.