Primary fan control device

Abstract

The embodiment of the utility model provides a primary air fan control device, and relates to the technical field of primary air fan control devices. The primary fan control device comprises a frequency conversion system, one end of the frequency conversion system is connected with a fan motor through a connecting line, the frequency conversion system is composed of a power cabinet, a transformer cabinet, a control cabinet and a bypass cabinet, and a primary fan is changed into an operation mode that the air volume is adjusted through a frequency conversion speed regulation primary fan. A set of frequency conversion system is added to a primary fan motor to be transformed into frequency conversion speed regulation, when the primary fan operates in a frequency conversion mode, the rotating speed of the primary fan is adjusted to achieve the purpose of adjusting the air supply amount, meanwhile, the adjusting mode of an original air supply amount adjusting baffle is reserved, and when a frequency converter breaks down or is overhauled, the frequency can be manually switched to the power frequency locally so that the primary fan can adopt the baffle to adjust the air quantity to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of primary fan control devices, in particular to a primary fan control device. Background Art

[0002] Primary fan: provides primary air with a certain pressure and flow rate to dry the pulverized coal and send it to the burner, providing oxygen required for the combustion of volatile matter in the pulverized coal. It is mainly composed of a motor, impeller, casing, air inlet box, collector, base, adjustment control system, etc.

[0003] Currently, the primary fans on the market run at a constant speed at industrial frequency. The power supply is directly sent from the 6KV switch cabinet to the motor side of the primary fan. The primary fan uses a baffle to adjust the air volume. When the primary fan is started, the maximum starting current at industrial frequency starting is 7-8 times the rated current, which will cause a certain impact on the motor and accelerate the wear of the motor. Utility Model Content

[0004] The utility model aims to provide a primary fan control device, which can solve the problem of certain impact on the motor and accelerated wear of the motor during power frequency startup.

[0005] The utility model provides a primary fan control device, comprising:

[0006] Frequency conversion system: one end of the frequency conversion system is connected to the fan motor through a connecting line, and the other end of the frequency conversion system is connected to the high-voltage switch cabinet;

[0007] The frequency conversion system consists of a power cabinet, a transformer cabinet, a control cabinet and a bypass cabinet, and the cabinets are connected by wires;

[0008] Bypass cabinet, three sets of knife switches K1, K2, K3 are arranged in the connection line of the bypass cabinet;

[0009] Control cabinet, the control cabinet is connected to the power supply through wires;

[0010] Control chassis, the equipment inside the frequency conversion system is installed inside the control chassis, and a support unit is arranged at the lower end of the control chassis, and the support units are distributed at the four corners of the lower end of the control chassis.

[0011] In a specific implementation scheme, the support unit includes a fixed frame fixedly installed at the lower end of the control chassis and a telescopic frame movably installed at the lower end of the fixed frame. The telescopic frame is inserted into the interior of the fixed frame and matches the size of the fixed frame. The fixed frame is raised and lowered by an adjustment component, and the lower end of the telescopic frame is also connected to a positioning base plate.

[0012] In a specific embodiment, the adjustment assembly includes an adjustment screw rotatably mounted inside a fixing frame with an opening at the lower end, a first bevel gear fixedly mounted on the upper end of the adjustment screw, and a second bevel gear meshingly mounted on one side of the first bevel gear.

[0013] In a specific implementation, an adjusting screw hole is provided at the upper end of the telescopic frame, an elastic sleeve is arranged at the lower end of the telescopic frame, and the upper and lower ends of the elastic sleeve are respectively installed on the sides of the telescopic frame and the positioning base plate.

[0014] In a specific implementation, a first connector is fixedly mounted on the lower end of the telescopic frame, a second connector is fixedly mounted on the upper end of the positioning base plate, and the first connector and the second connector are mounted via a torsion spring.

[0015] The utility model provides a primary fan control device, the frequency conversion system consists of a power cabinet, a transformer cabinet, a control cabinet and a bypass cabinet. The primary fan is changed to a variable frequency speed regulation primary fan operation mode to adjust the air volume. The primary fan motor is modified to variable frequency speed regulation by adding a set of frequency conversion systems. When the primary fan is variable frequency operation, the primary fan speed is adjusted to achieve the purpose of adjusting the air supply volume. At the same time, the original adjustment method of the air supply volume adjustment damper is retained. When the frequency converter fails or is under maintenance, it can be manually switched to the industrial frequency on the spot for the primary fan to use the damper to adjust the air volume operation; the maximum starting current of the fan motor at the industrial frequency start-up is 7-8 times the rated current. When the variable frequency speed regulation device is used, the maximum starting current is only slightly higher than the rated current of the fan motor. Therefore, the variable frequency speed regulation solves the problem of large current impact when the fan motor is started, eliminates the impact of the large motor starting current on the fan motor, the transmission equipment and the main machine, and reduces the daily maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a structural schematic diagram of a primary fan frequency conversion system according to an embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the industrial frequency and variable frequency structure of an embodiment of the utility model.

[0019] Figure 3 This is a schematic diagram of the control chassis structure of an embodiment of the utility model.

[0020] Figure 4This is a schematic diagram of the support unit structure of an embodiment of the utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the adjustment component of an embodiment of the utility model.

[0022] Figure 6 This is a schematic diagram of the telescopic frame structure of an embodiment of the utility model.

[0023] Figure 7 This is a schematic diagram of the positioning base plate installation structure of an embodiment of the utility model.

[0024] Icons: 100, frequency conversion system; 110, power cabinet; 120, transformer cabinet; 130, control cabinet; 140, bypass cabinet; 200, high-voltage switch cabinet; 300, fan motor; 400, power supply; 500, control chassis; 600, support unit; 610, fixing bracket; 620, telescopic bracket; 621, adjusting screw hole; 622, elastic soft cover; 623, first connector; 630, positioning base plate; 631, second connector; 640, adjustment assembly; 641, adjustment screw; 642, first bevel gear; 643, second bevel gear. DETAILED DESCRIPTION

[0025] When the primary fan is started, the maximum starting current at power frequency starting is 7-8 times the rated current, which will cause a certain impact on the motor and accelerate the wear of the motor. Therefore, the inventor has provided a primary fan control device after research. The primary fan motor is modified to variable frequency speed regulation by adding a set of frequency conversion system. When the primary fan is running at variable frequency, the speed of the primary fan is adjusted to achieve the purpose of adjusting the air supply volume. At the same time, the original adjustment method of the air supply volume adjustment damper is retained. When the frequency converter fails or is under maintenance, it can be manually switched to the power frequency on the spot to supply the primary fan with the damper to adjust the air volume, thereby solving the above defects.

[0026] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0027] Please refer to Figure 1 to Figure 2 The embodiment of the utility model provides a primary fan control device, including a frequency conversion system 100, one end of the frequency conversion system 100 is connected to a fan motor 300 through a connecting line, the fan motor 300 can drive the primary fan to rotate, and the other end of the frequency conversion system 100 is connected to a high-voltage switch cabinet 200.

[0028] The frequency conversion system 100 is composed of a power cabinet 110, a transformer cabinet 120, a control cabinet 130 and a bypass cabinet 140. The cabinets are connected by wires. The control cabinet 130 is connected to the power supply 400 by wires. Three sets of knife switches K1, K2, and K3 are arranged in the connecting line of the bypass cabinet 140. When K1 and K2 are closed and K3 is open, it operates in the frequency conversion state. When K1 and K2 are open and K3 is closed, it operates in the industrial frequency state.

[0029] The original primary fan was operated at a constant speed at industrial frequency, and the power supply was directly sent from the 6KV switch cabinet to the fan motor 300 side, so that the primary fan could use a damper to adjust the air volume. The current frequency conversion system 100 is installed in the primary fan room. The frequency conversion system 100 consists of a power cabinet 110, a transformer cabinet 120, a control cabinet 130 and a bypass cabinet 140. The primary fan is changed to a variable frequency speed control primary fan to adjust the air volume. The primary fan motor is equipped with a set of frequency conversion system 100 to be converted into variable frequency speed control. When the primary fan is operated at variable frequency, the speed of the primary fan is adjusted to achieve the air supply adjustment. For the purpose of quantity, the original air supply volume adjustment damper adjustment method is retained. When the frequency converter fails or is under maintenance, it can be manually switched to the industrial frequency supply on site. The primary fan uses the damper to adjust the air volume operation; the maximum starting current of the fan motor 300 at industrial frequency starting is 7-8 times the rated current. When the frequency conversion speed regulation device is used, the maximum starting current is only slightly higher than the rated current of the fan motor 300. Therefore, the frequency conversion speed regulation solves the problem of large current impact when the fan motor 300 starts, eliminates the impact of large motor starting current on the fan motor 300, transmission equipment and main machine, and reduces daily maintenance costs.

[0030] Please refer to Figures 3 to 7 The equipment inside the frequency conversion system 100 is installed inside the control chassis 600. A support unit 700 for supporting the control chassis 600 is arranged at the lower end of the control chassis 600. The support units 700 are distributed at the four corners of the lower end of the control chassis 600. The support unit 700 includes a fixed frame 710 fixedly installed at the lower end of the control chassis 600 and a telescopic frame 720 movably installed at the lower end of the fixed frame 710. The telescopic frame 720 is inserted into the interior of the fixed frame 710 and matches the size of the fixed frame 710. The fixed frame 710 is fixed to the lower end of the control chassis 600 by bolts and is raised and lowered by an adjustment component 740. The lower end of the telescopic frame 720 is also connected to a positioning base plate 730.

[0031] The adjustment assembly 740 includes an adjustment screw 741 rotatably mounted inside a fixing frame 710 with an opening at the lower end, a first bevel gear 742 fixedly mounted on the upper end of the adjustment screw 741, and a second bevel gear 743 meshingly mounted on one side of the first bevel gear 742 for transmission. The first bevel gear 742 and the connection between the adjustment screw 741 are mounted and positioned by bearings, and one side of the second bevel gear 743 is supported and mounted by bearings and extends to the outside of the fixing frame 710 for installation.

[0032] An adjusting screw hole 721 for driving the telescopic frame 720 to be raised and lowered is provided at the upper end of the telescopic frame 720, and an elastic soft cover 722 for protecting the connection between the telescopic frame 720 and the positioning base plate 730 is arranged at the lower end of the telescopic frame 720. The upper and lower ends of the elastic soft cover 722 are respectively installed on the sides of the telescopic frame 720 and the positioning base plate 730. A first connecting head 723 is fixedly installed at the lower end of the telescopic frame 720, and a second connecting head 731 is fixedly installed at the upper end of the positioning base plate 730. The first connecting head 723 and the second connecting head 731 are installed and fixed by a connecting shaft and installed by a torsion spring.

[0033] When installing the frequency conversion device, considering the need for ventilation and heat dissipation and operating space, the distance between the back of the control box 500 and the wall shall not be less than 600mm, the distance between the top of the control box 500 and the roof space shall not be less than 700mm, and the distance between the front of the control box 500 and the wall shall not be less than 1800mm. During the installation process, the frequency converter shall be protected from impact and vibration. All control boxes 500 shall not be inverted, and the tilt angle shall not exceed 30°. The frequency conversion and control equipment shall be installed inside the control box 500 of the control device. After the control box 500 is placed at the target position, the adjustment component 640 can be rotated, and the second bevel gear 643 is driven to rotate through the handle, and the adjustment screw 641 is driven to rotate through the first bevel gear 642, thereby pushing the telescopic frame 620 at the lower end to extend or shorten. The height can be adjusted according to the placement situation, which is convenient for supporting the control box 500, and has strong flexibility. At the same time, when supporting, the positioning base plate 630 can be rotated, which is convenient for placing on the inclined ground, and the supporting effect is better.

[0034] In summary, a primary fan control device according to an embodiment of the utility model, the frequency conversion system 100 is composed of a power cabinet 110, a transformer cabinet 120, a control cabinet 130 and a bypass cabinet 140. The primary fan is changed to a variable frequency speed regulation primary fan operation mode to adjust the air volume. The primary fan motor is modified to a variable frequency speed regulation by adding a set of frequency conversion systems 100. When the primary fan is in variable frequency operation, the primary fan speed is adjusted to achieve the purpose of adjusting the air supply volume. At the same time, the original adjustment method of the air supply volume adjustment damper is retained. When the frequency converter fails or is under maintenance, it can be manually switched to the industrial frequency on the spot for the primary fan to use the damper to adjust the air volume. The maximum starting current of the fan motor 300 when the industrial frequency is started is 7-8 times the rated current. When the variable frequency speed regulation device is used, the maximum starting current is only slightly higher than the rated current of the fan motor 300. Therefore, the variable frequency speed regulation solves the problem of large current impact when the fan motor 300 is started, eliminates the impact of the large motor starting current on the fan motor 300, the transmission equipment and the host, and reduces the cost of daily maintenance.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A primary fan control device, characterized in that: include Frequency conversion system: one end of the frequency conversion system is connected to the fan motor through a connecting line, and the other end of the frequency conversion system is connected to the high-voltage switch cabinet; The frequency conversion system consists of a power cabinet, a transformer cabinet, a control cabinet and a bypass cabinet, and the cabinets are connected by wires; Bypass cabinet, three sets of knife switches K1, K2, K3 are arranged in the connection line of the bypass cabinet; Control cabinet, the control cabinet is connected to the power supply through wires; Control chassis, the equipment inside the frequency conversion system is installed inside the control chassis, and a support unit is arranged at the lower end of the control chassis, and the support units are distributed at the four corners of the lower end of the control chassis.

2. A primary fan control device according to claim 1, characterized in that: The support unit includes a fixed frame fixedly installed at the lower end of the control chassis and a telescopic frame movably installed at the lower end of the fixed frame. The telescopic frame is inserted into the interior of the fixed frame and matches the size of the fixed frame. The fixed frame is raised and lowered by an adjustment component, and the lower end of the telescopic frame is also connected to a positioning base plate.

3. A primary fan control device according to claim 2, characterized in that: The adjusting assembly comprises an adjusting screw rotatably mounted inside a fixing frame with an opening at the lower end, a first bevel gear fixedly mounted on the upper end of the adjusting screw, and a second bevel gear meshingly mounted on one side of the first bevel gear.

4. A primary fan control device according to claim 3, characterized in that: An adjusting screw hole is provided at the upper end of the telescopic frame, an elastic soft sleeve is arranged at the lower end of the telescopic frame, and the upper and lower ends of the elastic soft sleeve are respectively installed on the sides of the telescopic frame and the positioning bottom plate.

5. A primary fan control device according to claim 4, characterized in that: A first connector is fixedly mounted on the lower end of the telescopic frame, and a second connector is fixedly mounted on the upper end of the positioning base plate. The first connector and the second connector are mounted via a torsion spring.

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