Novel air pre-heater flexible driving device

Abstract

The utility model relates to a novel flexible driving device for an air preheater, which is characterized by comprising an auxiliary motor, a drum-shaped tooth-shaped coupler, a support box, a permanent magnet rotor, a conductor rotor, an air preheater reduction gearbox, an electric actuator, a guide rail and a guide rail sliding block, the output end of the auxiliary motor is connected with the drum-shaped tooth-shaped coupler, and the drum-shaped tooth-shaped coupler is connected with one end of the support box; the bottom of the supporting box is connected with a guide rail sliding block, the guide rail sliding block is connected to a guide rail in a sliding mode, the guide rail sliding block is connected with an electric actuator, the other end of the supporting box is connected with a permanent magnet rotor, the permanent magnet rotor is inserted into a conductor rotor and is in coupling connection with the conductor rotor, and the conductor rotor is connected with an air preheater reduction gearbox. The air preheater is simple in structure and convenient to operate, a bearing and a quick-wear part are not arranged in the whole structure, the flexible starting function and the full-speed operation function of the air preheater are achieved, the air preheater can be completely separated from operation when a main motor operates, and a brake device does not need to be additionally arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of driving an air preheater, in particular to a novel flexible driving device for an air preheater. Background Art

[0002] Air preheater refers to air preheater. The air preheater drive device consists of main motor, auxiliary motor and pneumatic motor (see attached Figure 1 ). The pneumatic motor is used to start the air preheater. The auxiliary motor is used as backup power in case of a main motor failure. After the auxiliary motor speed is reduced by the reducer, it drives the air preheater through the overrunning elastic coupling, and the speed is half of the main motor. When the main motor is running, the power of the auxiliary motor is cut off due to the overrunning elastic coupling. When the main motor fails, the auxiliary motor is put into operation, but because the speed is only half of the main motor, it affects the heat exchange efficiency, so it is only used for short-term operation and the main motor is stopped after repair. The main motor is used to drive the air preheater under normal circumstances. The main motor uses a hydraulic coupling to drive the air preheater.

[0003] At present, the hydraulic coupling used in the main motor often leaks oil, resulting in a decrease in transmission capacity and affecting the heat exchange effect of the air preheater. When the oil leakage is serious or the load increases, the oil temperature will rise, the fusible plug will melt, the transmission oil will spray out, the power of the main motor will be cut off, and the air preheater will stop. The auxiliary motor uses an imported overrunning elastic coupling, which is expensive. Due to frequent idling, it is easy to wear and fail, resulting in the inability to automatically disengage the auxiliary motor. When the main motor is running, the auxiliary motor is reversely dragged and is in a power generation state. When the auxiliary motor is required to be put into operation, it cannot be driven normally. When the main motor fails, it is necessary to shut down, remove the main motor, and then put the auxiliary motor into half-speed operation to keep the air preheater from stopping for a long time. These problems make the air preheater maintenance workload large, the spare parts consumption large, and it is often in an unsafe operating state, threatening the safe operation of the power plant.

[0004] According to the operation status and operation requirements of the air preheater drive device, it is necessary to transform it. The commonly used speed control drive methods are: variable frequency speed control and permanent magnet speed controller, but there are still some problems;

[0005] 1) Frequency conversion speed regulation

[0006] Frequency conversion is a widely used speed regulation method. Its main disadvantages are strict environmental requirements, electromagnetic interference and grid pollution during use, easy failure and cumbersome maintenance. Some failures require disconnection of the power supply to reset. Electronic components are prone to aging, which can easily lead to downtime events. In addition, the transformation still requires the use of a super elastic coupling to disengage from operation.

[0007] 2) Permanent magnet speed regulator

[0008] The permanent magnet rotor and speed regulating mechanism are connected to the gearbox and rotate at full speed all the time. Due to the bearings, they need to be greased and replaced regularly. The bearings are unreliable and the rotor is easy to fly out after long-term operation. The motor shaft has a large permanent magnet rotor and is heavy. Moving the motor will have a large axial force, causing the motor shaft to bend.

[0009] Therefore, it is necessary to propose a new type of air preheater flexible driving device to solve the above problems. Utility Model Content

[0010] According to the above existing technical problems, the utility model provides a novel air preheater flexible drive device, which is characterized by comprising an auxiliary motor, a drum-shaped toothed coupling, a support box, a permanent magnet rotor, a conductor rotor, an air preheater reduction box, an electric actuator, a guide rail, and a guide rail slider. The output end of the auxiliary motor is connected to the drum-shaped toothed coupling, the drum-shaped toothed coupling is connected to one end of the support box, the bottom of the support box is connected to the guide rail slider, the guide rail slider is slidably connected to the guide rail, the guide rail slider is connected to the electric actuator, the other end of the support box is connected to the permanent magnet rotor, the permanent magnet rotor is inserted into the conductor rotor and coupled with it, and the conductor rotor is connected to the air preheater reduction box.

[0011] The electric actuator is electrically connected to the control box, and a control module in the control box transmits a signal to control the operation of the electric actuator.

[0012] Specifically, the auxiliary motor is an auxiliary motor in an air preheater.

[0013] Beneficial effects of the utility model:

[0014] The utility model has a simple structure and is easy to operate. There are no bearings or wearing parts in the overall structure, and the flexible starting function and full-speed operation function of the air preheater can be realized. Before the main motor is started, the electric actuator drives the guide rail slider to move, and pulls out the whole composed of the support box and the permanent magnet rotor, so that the auxiliary motor is completely disengaged, and the auxiliary motor does not rotate when the main motor is running; when the main motor fails, the auxiliary motor can be started as a starting motor, and the electric actuator drives the guide rail slider to insert the whole composed of the support box and the permanent magnet rotor and gradually couple it with the conductor rotor, so that the air preheater gradually accelerates from zero to the rated speed, and the power is smoothly connected to the system. At this time, the auxiliary motor plays the function of a backup main motor.

[0015] The permanent magnet flexible drive device designed in the utility model is currently the most suitable drive mode for air preheaters. The main motor can also be transformed into the drive mode in this application. The two are the main and auxiliary motors respectively. Any one of them can be used as the drive while the other is disconnected. In case one of the motors fails, it can be switched and sent for repair without stopping the machine, thus realizing maintenance without stopping the machine, not affecting the heat exchange effect, and ensuring the safe operation of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an air preheater in the prior art in the background technology of the utility model;

[0017] Figure 2 This is a schematic diagram of the front cover structure of a new type of air preheater flexible drive device of the utility model;

[0018] As shown in the figure: 11. Main motor, 12. Auxiliary motor, 13. Gearbox, 14. Fluid coupling, 15. Reducer, 16. Pneumatic motor, 17. Beyond elastic coupling, 1. Auxiliary motor, 2. Drum gear coupling, 3. Support box, 4. Permanent magnet rotor, 5. Conductor rotor, 6. Air preheater reducer, 7. Electric actuator, 8. Guide rail slider, 81. Guide rail, 9. Control box. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1

[0023] As shown in the figure, the output end of the auxiliary motor 1 is connected to the drum-shaped toothed coupling 2, the drum-shaped toothed coupling 2 is connected to one end of the support box 3, the bottom of the support box 3 is connected to the guide rail slider 8, the guide rail slider 8 is slidably connected to the guide rail 81, the guide rail slider 8 is connected to the electric actuator 7, the other end of the support box 3 is connected to the permanent magnet rotor 4, the permanent magnet rotor 4 is inserted in the conductor rotor 5 and coupled with it, the conductor rotor 5 is connected to the air preheater reduction box 6, wherein the electric actuator 7 is electrically connected to the control box 9, and the signal control is transmitted through the control module in the control box 9 The electric actuator is running, wherein the drum-shaped gear coupling 2 is an existing device. The drum-shaped gear coupling 2 is a rigid-flexible coupling, and has the ability to compensate for radial, axial and angular axis deviations. Compared with the CL-type spur gear coupling, it has the advantages of compact structure, small turning radius, large load-bearing capacity, high transmission efficiency, low noise and long maintenance cycle. In this application, it plays the role of providing telescopic amount and transmission. The electric actuator 7 can adopt an electric push rod, an electric telescopic rod, and a motor and a lead screw to form a lead screw guide rail, etc., to realize the axial movement function of the guide rail slider 8.

[0024] During the use of the utility model, the auxiliary motor 1 in the present application is the auxiliary motor 11 in the air preheater. Before the main motor is started, the electric actuator 7 drives the guide rail slider 8 to move, and pulls out the whole composed of the support box 3 and the permanent magnet rotor 4, so that the auxiliary motor 1 is completely disengaged. When the main motor is running, the auxiliary motor 1 does not rotate; when the main motor fails, the auxiliary motor 1 can be started as a starting motor, and the electric actuator 7 drives the guide rail slider 8 to insert the whole composed of the support box 3 and the permanent magnet rotor 4 and gradually couple with the conductor rotor 5, so that the air preheater gradually accelerates from zero to the rated speed, and the power is smoothly connected to the system. At this time, the auxiliary motor 1 plays the function of a backup main motor.

[0025] Before the air preheater is started, the auxiliary motor 1 is started, and the auxiliary motor 1 is started without load. The control box 9 receives the DCS signal and transmits the control command to control the electric actuator 7 to start. The electric actuator 7 drives the guide rail slider 8 to move, and the whole composed of the support box 3 and the permanent magnet rotor 4 is close to the conductor rotor 5, and the air gap is continuously reduced. The conductor rotor 5 drives the air preheater reduction box 6 to slowly accelerate until the rated speed, so that the air preheater gradually accelerates from zero to the rated speed. The auxiliary motor 1 can be used as the main motor in the air preheater for long-term operation. If the main motor needs to be put into use, the main motor is started, and then a disengagement signal is given. The electric actuator 1 drives the guide rail slider 8 to move the whole composed of the support box 3 and the permanent magnet rotor 4 away from the conductor rotor 5, and the air gap is continuously increased. The auxiliary motor 1 is completely out of operation and the power supply of the auxiliary motor 1 is cut off.

[0026] The new permanent magnet flexible drive device speed regulating drive device designed in this application has a simple structure, is easy to operate, has no bearings, and has no wearing parts. It can realize the flexible starting function and full-speed operation function of the air preheater, and can completely disengage from the operation when the main motor is running, without adding a brake device, and can fully achieve the expected transformation effect.

[0027] Example 2

[0028] The difference between this embodiment and Embodiment 1 is that the structure of the main motor 11 in the air preheater is also modified to adopt the driving method of the present application, and the main motor can also be disengaged. The main motor and the auxiliary motor can be the main or auxiliary motor of each other, and any one of them can be used as the drive while the other is disengaged.

[0029] In case one of the motors fails, it can be switched without stopping the machine and the faulty motor can be sent for repair, which can achieve maintenance without stopping the machine and affect the heat exchange effect, thus ensuring the safe operation of the power plant.

[0030] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The various components mentioned in the utility model are common technologies in the existing field. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A new type of air preheater flexible drive device, characterized in that It includes an auxiliary motor, a drum-shaped toothed coupling, a support box, a permanent magnet rotor, a conductor rotor, an air preheater reduction box, an electric actuator, a guide rail, and a guide rail slider. The output end of the auxiliary motor is connected to the drum-shaped toothed coupling, the drum-shaped toothed coupling is connected to one end of the support box, the bottom of the support box is connected to the guide rail slider, the guide rail slider is slidably connected to the guide rail, the guide rail slider is connected to the electric actuator, the other end of the support box is connected to the permanent magnet rotor, the permanent magnet rotor is inserted into the conductor rotor and coupled to it, and the conductor rotor is connected to the air preheater reduction box.

2. A novel air preheater flexible drive device according to claim 1, characterized in that The electric actuator is electrically connected to the control box.

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