Control device of frequency converter of induced draft fan

Abstract

The utility model relates to the technical field of control devices, in particular to a control device of a frequency converter of an induced draft fan, which comprises a base, an engine is fixedly connected to the rear side of one side of the center of the base, and a main control box is fixedly connected to the front end of one side of the center of the base. The center of the engine is sleeved and fixedly connected with a protective sleeve, rotating motors are symmetrically and fixedly connected to the two sides of the top end of the protective sleeve, a speed reduction sleeve is arranged on the inner side of the protective sleeve, threaded holes are symmetrically formed in the two sides of the speed reduction sleeve, and the output ends of the rotating motors penetrate through the protective sleeve and are fixedly connected with threaded rods. According to the control device of the frequency converter of the induced draft fan, the rotating speed of the engine can be reduced through the arranged buffer wheel, the voltage fluctuation of a power grid is monitored and predicted in real time through the sensor, the output voltage and frequency of the frequency converter are adjusted, and the frequency of the frequency converter is adjusted. And stable operation of the induced draft fan during the voltage fluctuation period is ensured.

Description

Technical Field

[0001] This utility model relates to the field of control device technology, and in particular to a control device for an induced draft fan frequency converter. Background Technology

[0002] A variable frequency drive (VFD) for induced draft fans is a device specifically designed to control the speed of induced draft fans. It adjusts the fan speed by changing the frequency of the power supply, thereby achieving precise control of airflow. However, VFDs are prone to automatic tripping when there are large fluctuations in the mains voltage, leading to equipment downtime and impacting production efficiency. Furthermore, when restarting the VFD, it is essential to wait for the motor speed to drop to a safe range; otherwise, it may trip due to overvoltage faults, increasing downtime and maintenance costs. While some VFDs on the market possess certain protection functions, they still struggle to guarantee stable operation under significant mains voltage fluctuations. In addition, some VFDs require complex restart procedures and waiting times, failing to meet the demands of rapid production response.

[0003] Therefore, it is necessary to provide a new control device for the frequency converter of the induced draft fan to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a control device for an induced draft fan frequency converter.

[0005] The control device for the induced draft fan frequency converter provided by this utility model includes:

[0006] The base has an engine fixedly connected to its rear side and a main control box fixedly connected to its front side.

[0007] A buffer wheel is provided. A protective sleeve is fitted and fixedly connected to the center of the engine. Multiple sets of rotary motors are fixedly connected to the top of the protective sleeve. A reduction sleeve is provided on the inner side of the protective sleeve. Threaded holes are symmetrically opened on both sides of the reduction sleeve. The output end of the rotary motor passes through the protective sleeve and is fixedly connected to a threaded rod. The output end of the rotary motor is rotatably connected to the protective sleeve through a bearing. The threaded rod meshes with the threaded hole. Buffer wheels are rotatably connected to both sides of the reduction sleeve. A rotating shaft is connected inside the engine. The reduction sleeve is fitted on the outside of the rotating shaft. Observation windows are symmetrically opened on both sides of the protective sleeve.

[0008] The sensor is fixedly connected to a human-machine interface on one side of the main control box, a programmable logic controller is fixedly connected to one side of the main control box, an optical cable is fixedly connected to one side of the main control box, and a sensor is fixedly connected to the end of the optical cable.

[0009] Preferably, the bottom end of the base is fixedly connected with an anti-slip pad, and there are two sets of anti-slip pads. The anti-slip pads can prevent the device from sliding on the plane.

[0010] Preferably, the fuel inlet on the rear side of the engine is fixedly connected to a fuel supply pipe, through which fuel can be input into the engine.

[0011] Preferably, a cable is fixedly connected to the front end of the engine, through which power can be transmitted to the induced draft fan.

[0012] Preferably, the rotary motor is electrically connected to the main control box via wires, and power and control signals can be transmitted to various electronic components through the wires.

[0013] Preferably, a positioning sleeve is movably connected to the top end of the threaded rod, and the position of rotation of the threaded rod can be determined by the positioning sleeve.

[0014] Preferably, a switching power supply is fixedly connected to the front of the main control box, and the main control box can be started intuitively through the set switching power supply.

[0015] Preferably, a power cord is fixedly connected to the rear of the main control box, and power can be supplied to the main control box through the power cord.

[0016] Compared with related technologies, the control device for the induced draft fan frequency converter provided by this utility model has the following beneficial effects:

[0017] This utility model provides a control device for an induced draft fan frequency converter;

[0018] 1. This utility model can reduce the engine speed by setting a buffer wheel. After the induced draft fan stops, the bottom output end of the rotary motor can be controlled by the main control box through the human-machine interface to rotate, which drives the threaded rod to rotate. This causes the reduction sleeve sleeved and engaged on the threaded rod to close up and down, and causes the buffer wheel inside the reduction sleeve to contact the rotating shaft inside the engine. The buffer wheel disperses the rotation speed of the rotating shaft, thereby reducing the engine speed to facilitate the subsequent restart of the equipment.

[0019] 2. This utility model can monitor and predict grid voltage fluctuations in real time through set sensors. After the induced draft fan trips and the engine speed is reduced, the sensor can collect the induced draft fan's operating status information and transmit it to the programmable logic controller (PLC) in the main control box via optical fiber. The PLC receives and processes this information and transmits control signals to the main control box. Based on the processing results, the main control box outputs control signals via optical fiber to drive the power unit, thereby adjusting the induced draft fan's operating parameters. When the grid voltage fluctuation exceeds a set threshold, the low-voltage ride-through function is activated. The inverter output is adjusted to adapt to grid voltage changes. When the inverter needs to be restarted, a start signal is directly sent to the main control box to drive the power unit to adjust the induced draft fan's operating parameters to adapt to the engine speed and restart the induced draft fan, thereby reducing equipment downtime and meeting production process requirements. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of the control device for the induced draft fan frequency converter provided by this utility model;

[0021] Figure 2 for Figure 1 A top view schematic diagram of the control device for the frequency converter of the induced draft fan;

[0022] Figure 3 for Figure 1 The diagram shows a front sectional view of the control device for the induced draft fan frequency converter.

[0023] The following components are labeled in the diagram: 1. Base; 2. Engine; 3. Anti-slip mat; 4. Oil pipe; 5. Cable; 6. Protective sleeve; 7. Rotary motor; 8. Main control box; 9. Human-machine interface; 10. Programmable logic controller; 11. Switching power supply; 12. Power cord; 13. Wire; 14. Optical cable; 15. Sensor; 16. Threaded rod; 17. Reduction sleeve; 18. Threaded hole; 19. Shaft; 20. Observation window; 21. Buffer wheel; 22. Positioning sleeve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 3 This utility model provides a control device for an induced draft fan frequency converter, the control device for the induced draft fan frequency converter includes:

[0027] The base 1 has an engine 2 fixedly connected to its rear side and a main control box 8 fixedly connected to its front side.

[0028] A buffer wheel 21 is provided. A protective sleeve 6 is fitted and fixedly connected to the center of the engine 2. Multiple sets of rotary motors 7 are fixedly connected to the top of the protective sleeve 6. A reduction sleeve 17 is provided on the inner side of the protective sleeve 6. Threaded holes 18 are symmetrically opened on both sides of the reduction sleeve 17. The output end of the rotary motor 7 passes through the protective sleeve 6 and is fixedly connected to a threaded rod 16. The output end of the rotary motor 7 is rotatably connected to the protective sleeve 6 through a bearing. The threaded rod 16 meshes with the threaded hole 18. Buffer wheels 21 are rotatably connected to both sides of the reduction sleeve 17. A rotating shaft 19 is connected inside the engine 2. The reduction sleeve 17 is fitted on the outer side of the rotating shaft 19. Observation windows 20 are symmetrically opened on both sides of the protective sleeve 6.

[0029] Sensor 15, a human-machine interface 9 is fixedly connected to one side of the main control box 8, a programmable logic controller 10 is fixedly connected to one side of the main control box 8, an optical cable 14 is fixedly connected to one side of the main control box 8, and a sensor 15 is fixedly connected to the end of the optical cable 14.

[0030] It should be noted that after the induced draft fan trips and stops, the main control box 8 can be controlled via the human-machine interface 9 to rotate the bottom output end of the rotary motor 7, driving the threaded rod 16 to rotate. This causes the reduction sleeve 17, which is fitted and engaged on the threaded rod 16, to close up and down. This causes the buffer wheel 21, which is rotated inside the reduction sleeve 17, to contact the rotating shaft 19 inside the engine 2. The buffer wheel 21 disperses the rotational speed of the rotating shaft 19, thereby reducing the engine speed to facilitate subsequent restart of the equipment. After the induced draft fan trips and stops and the engine speed is reduced, the operating status information of the induced draft fan can be collected by the sensor 15 and transmitted to the programmable logic controller 10 of the main control box 8 via the optical cable 14. The programmable logic controller 10 receives and processes this information and transmits control signals to the main control box 8. Based on the processing results, the main control box 8 outputs control signals via the optical cable 14 to drive the power unit, thereby adjusting the operating parameters of the induced draft fan. When the grid voltage fluctuation exceeds the set threshold, the low voltage ride-through function is activated. Adjust the output of the frequency converter to adapt to changes in grid voltage. When it is necessary to restart the frequency converter, send a start signal directly to the main control box 8 to drive the power unit to adjust the operating parameters of the induced draft fan to adapt to the speed of the engine 2 and restart the induced draft fan, thereby reducing equipment downtime and meeting production process requirements.

[0031] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 The bottom end of the base 1 is fixedly connected to an anti-slip pad 3, and there are two sets of anti-slip pads 3. The anti-slip pads 3 can prevent the device from sliding on the plane.

[0032] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 Fuel can be fed into engine 2 through the oil inlet port on the rear side of engine 2 via oil pipe 4.

[0033] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 The front end of the engine 2 is fixedly connected to a cable 5, through which power can be transmitted to the induced draft fan.

[0034] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 The rotary motor 7 is electrically connected to the main control box 8 via wire 13. Power and control signals can be transmitted to various electronic components via the wire 13.

[0035] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 The top end of the threaded rod 16 is movably connected to a positioning sleeve 22, which determines the rotational position of the threaded rod 16.

[0036] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 A switching power supply 11 is fixedly connected to the front of the main control box 8, and the main control box 8 can be started directly by the switching power supply 11.

[0037] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 A power cord 12 is fixedly connected to the rear side of the main control box 8, and power can be provided to the main control box 8 through the power cord 12.

[0038] The working principle of the control device for the induced draft fan frequency converter provided by this utility model is as follows:

[0039] When in use, first connect the power cord 12 to the backup power supply. After the induced draft fan trips and stops, the main control box 8 can be controlled through the human-machine interface 9 to rotate the bottom output end of the rotary motor 7, which drives the threaded rod 16 to rotate. This causes the reduction sleeve 17, which is sleeved and engaged on the threaded rod 16, to close up and down. This causes the buffer wheel 21, which is rotated inside the reduction sleeve 17, to contact the rotating shaft 19 inside the engine 2. The buffer wheel 21 disperses the rotation speed of the rotating shaft 19, thereby reducing the engine speed to facilitate subsequent restart of the equipment. After the engine speed is reduced after the induced draft fan trips and stops, the operating status information of the induced draft fan can be collected by the sensor 15 and transmitted to the programmable logic controller 10 of the main control box 8 through the optical cable 14. The programmable logic controller 10 receives and processes this information and transmits the control signal to the main control box 8. Based on the processing result, the main control box 8 outputs the control signal through the optical cable 14 to drive the power unit, thereby adjusting the operating parameters of the induced draft fan. When the grid voltage fluctuation exceeds the set threshold, the low voltage ride-through function is activated. Adjust the output of the frequency converter to adapt to changes in grid voltage. When it is necessary to restart the frequency converter, send a start signal directly to the main control box 8 to drive the power unit to adjust the operating parameters of the induced draft fan to adapt to the speed of the engine 2 and restart the induced draft fan, thereby reducing equipment downtime and meeting production process requirements.

[0040] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A control device for an induced draft fan frequency converter, characterized in that, include: The base (1) has an engine (2) fixedly connected to its rear side and a main control box (8) fixedly connected to its front end. A buffer wheel (21) is provided. A protective sleeve (6) is fitted and fixedly connected to the center of the engine (2). Multiple sets of rotary motors (7) are fixedly connected to the top of the protective sleeve (6). A reduction sleeve (17) is provided on the inner side of the protective sleeve (6). Threaded holes (18) are symmetrically opened on both sides of the reduction sleeve (17). The output end of the rotary motor (7) passes through the protective sleeve (6) and is fixedly connected to a threaded rod (16). The output end of the rotary motor (7) is rotatably connected to the protective sleeve (6) through a bearing. The threaded rod (16) meshes with the threaded hole (18). A buffer wheel (21) is rotatably connected on both sides of the reduction sleeve (17). A rotating shaft (19) is connected inside the engine (2). The reduction sleeve (17) is fitted on the outside of the rotating shaft (19). Observation windows (20) are symmetrically opened on both sides of the protective sleeve (6). The sensor (15) is fixedly connected to a human-machine interface (9) on one side of the main control box (8), a programmable logic controller (10) is fixedly connected to one side of the main control box (8), an optical cable (14) is fixedly connected to one side of the main control box (8), and a sensor (15) is fixedly connected to the end of the optical cable (14).

2. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, The bottom end of the base (1) is fixedly connected to an anti-slip pad (3), and the anti-slip pad (3) is provided in two sets.

3. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, The oil supply port on the rear side of the engine (2) is fixedly connected to an oil supply pipe (4).

4. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, The front end of the engine (2) is fixedly connected to a cable (5).

5. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, The rotary motor (7) is electrically connected to the main control box (8) via wires (13).

6. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, The top end of the threaded rod (16) is movably connected to a positioning sleeve (22).

7. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, A switching power supply (11) is fixedly connected to the front side of the main control box (8).

8. The control device for the induced draft fan frequency converter according to claim 1, characterized in that, A power cord (12) is fixedly connected to the rear side of the main control box (8).

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