1. An electromagnetic barring apparatus includes a plurality of electromagnetic coils, characterized in that: the plurality of electromagnetic coils are uniformly arranged along the circumferential direction of the outer circle of the steam turbine rotor, and the plurality of electromagnetic coils are respectively connected with corresponding intermediate relays in the control device and used for generating electromagnetic force to push the steam turbine rotor to rotate after the corresponding intermediate relays are sequentially electrified through logic control.

2. The electromagnetic barring device according to claim 1, characterized in that: and the plurality of electromagnetic coils are fixedly connected to a circular ring on the periphery of the steam turbine rotor to form a nested structure.

3. The electromagnetic barring device according to claim 1, characterized in that: the electromagnetic coil comprises an iron core and a coil, wherein the coil is wound outside the iron core and is connected with the intermediate relay.

4. The electromagnetic barring device according to claim 3, characterized in that: and the number of turns of the coil wound outside the iron core is matched with the required electromagnetic force.

5. The electromagnetic barring device according to claim 1, characterized in that: the number of the electromagnetic coils is 5, and an included angle between the two electromagnetic coils is 72 degrees.

Background

Before starting and after stopping the steam turbine, turning is needed to avoid bending deformation of the rotor. The turning gear of the steam turbine has three types of manual operation, electric operation and hydraulic pressure.

The oldest marine steam turbine generally adopts manual barring, needs manual barring of a special design hand wheel handle, and rotates the steam turbine rotor through a mechanical mechanism composed of connecting rod pawls and the like. As shown in fig. 1. The manual barring gear is complex in structure, a handle needs to be manually turned, the rotor is difficult to rotate at a constant speed, and torque capable of being driven is limited by manpower, so that the manual barring gear is an original barring mode.

With the development of hydraulic technology, the electric oil pumps which are required to be started for turning a vehicle before starting and after stopping of a marine steam turbine are operated to provide oil pressure of about 0.8MPa for hydraulic transmission, and a ratchet structure arranged on a steam turbine rotor system is pushed after a pawl regularly acts, so that the rotor is turned, as shown in fig. 2. (patent No. ZL 201620372457X).

The medium-sized and large-sized units both adopt an electric automatic barring gear, and on the basis of land electric barring, a certain marine steam turbine adopts a rotation speed difference of mutual meshing of internal threads and external threads when an electromagnet stroke clutch shaft and a transmission shaft synchronously rotate, so that the clutch shaft axially moves along a thread section, and automatic meshing and automatic disengagement of the barring are realized, as shown in fig. 3. (patent application No. 201811493513.5).

Manual barring requires manual cooperation, and the barring mode has been used in the ancient times along with the improvement and the requirement of the automation level; the main problems of the hydraulic barring gear and the electric barring gear are that: 1. the structure is complex, and the device needs to be configured as an independent device; 2. the weight and the volume are large, which is not beneficial to the utilization of the space for the ship; 3. lubricating oil needs to be supplied in a matched manner, and as the unit develops to the electromagnetic bearing, the supply of the lubricating oil restricts the simplification and miniaturization of the system.

Disclosure of Invention

In order to realize automatic rotary barring of a rotor before starting and after stopping of a marine steam turbine and simplify a steam turbine body and a matching system, the invention provides the electromagnetic barring device which innovatively utilizes electromagnetic force to carry out set barring work, is beneficial to simplifying the barring device, helps the set and the system to distinguish a lubricating oil system, and provides assistance for full-electric development.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an electromagnetic barring gear, includes a plurality of solenoid, and a plurality of solenoid are evenly arranged along steam turbine rotor excircle circumference, and a plurality of solenoid are connected with the intermediate relay who corresponds among the controlling means respectively for the intermediate relay who corresponds produces the electromagnetic force and promotes the steam turbine rotor and rotate after circular telegram in proper order through logic control.

Furthermore, a plurality of solenoid fixed connection constitute nested structure on the ring of steam turbine rotor periphery.

Further, solenoid includes iron core, coil, the winding coil outside the iron core, the intermediate relay is connected to the coil.

Furthermore, the number of turns of the coil wound outside the iron core is matched with the required electromagnetic force.

Furthermore, the number of the electromagnetic coils is 5, and an included angle between the two electromagnetic coils is 72 degrees.

The invention has the beneficial effects that:

in order to avoid the influence on the dynamic balance performance of the rotor caused by arranging a movable component on the rotor of the rotary machine, avoid the occurrence of misoperation and movable component failure and ensure the safety and reliability of the operation of equipment. Therefore, the electromagnetic turning gear is designed into a nested structure and is arranged on the outer circle of the rotor. Meanwhile, the compact structural arrangement mode is favorable for the miniaturization design of the rotary machine.

According to the electromagnetic barring device, the electromagnetic barring is innovatively utilized for the barring work of the unit, the barring device is simplified, the unit and the system are helped to distinguish a lubricating oil system, and assistance is provided for full-electric development.

Drawings

FIG. 1 is a schematic view of a manual barring gear;

FIG. 2 is a schematic view of a hydraulic barring gear;

FIG. 3 is a schematic view of an electric barring gear;

FIG. 4 is a schematic structural diagram of an electromagnetic barring apparatus according to the present invention;

fig. 5 is a control logic diagram of the electromagnetic barring apparatus according to the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 4, the electromagnetic barring apparatus of the present invention includes a rotor 1, a ring 2, an iron core 3, a coil, and a control device.

The proper amount of iron core 3 of ring 2 internally mounted to twine proper amount of coil with iron core 3 outward, energize the coil, the electromagnetic force that produces promotes the rotor and rotates, in order to make the rotor can rotate according to the required direction, therefore the iron core can not be energized simultaneously, need output electromagnetic force in proper order according to certain logic order in order to drive the rotor and rotate.

In the preferred embodiment of the invention, 5 iron cores 3 are adopted, 72 ℃ is arranged between every two iron cores 3, 5 independent intermediate relays are adopted in the control device and are respectively connected with the 5 iron cores 3, and the energization of 5 iron core coils is respectively controlled by logically controlling the on-off of the 5 intermediate relays, as shown in fig. 5, namely, the 5 iron cores can sequentially generate electromagnetic force according to the corresponding sequence to push the rotor to rotate, so that the electromagnetic force barring effect is realized, and meanwhile, according to the actual condition of a unit, the size of the electromagnetic force is adjusted by adjusting the number of turns of the coils on the iron cores, namely, the number of turns is more, the electromagnetic force is larger, and conversely, the number of turns is less, and the electromagnetic force is smaller.