Intelligent linkage control device for switching from frequency conversion to power frequency of primary air fan

Abstract

The utility model relates to an intelligent linkage control device for switching from frequency conversion to power frequency of a primary air fan. The intelligent linkage control device comprises sensor equipment, a PLC (Programmable Logic Controller), a switching device, a power frequency device and a frequency converter, wherein the sensor equipment is connected with the PLC controller; the PLC is connected with the switching device; the switching device is respectively connected with the power frequency device and the frequency converter; the power frequency device and the frequency converter are used for being connected with a motor of a primary air fan. According to the intelligent linkage control device for switching from frequency conversion to power frequency of the primary air fan, through the reasonable connection relation and structural design, the maintenance and repair difficulty of the intelligent linkage control device is reduced. And meanwhile, the clear connection relation between the equipment is beneficial to reducing the possibility of misoperation and fault occurrence, so that the stability and reliability of the intelligent linkage control device are improved. Any connection problem or equipment fault can be recognized and solved more easily, and the operation risk of the intelligent linkage control device is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of frequency conversion control, and particularly relates to an intelligent linkage control device for switching a primary fan from frequency conversion to industrial frequency. Background Art

[0002] The primary fan is an important auxiliary machine in a thermal power plant. It has a large capacity and consumes a lot of electricity. It is in continuous operation, low load and variable load operation for a long time. Currently, most of them use throttling regulation to control the primary air main pipe pressure. It has huge energy-saving potential. The use of variable frequency speed regulation technology is a more ideal way to save energy.

[0003] However, the current control device for switching from frequency conversion to industrial frequency of a primary fan has a complex structure, and each connection point and component is a potential source of failure. Therefore, the complex structure makes the existing control device more prone to failure, and also increases the instability and reliability of the existing control device. Problems such as connection errors, component failure or mismatch may affect the stability of the existing control device, thereby reducing the reliability of the control device.

[0004] Therefore, there is an urgent need for a new intelligent linkage control device for switching the primary fan frequency from variable frequency to industrial frequency. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In order to solve the above problems in the prior art, the utility model provides an intelligent linkage control device for switching a primary fan from variable frequency to industrial frequency.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] The utility model provides an intelligent linkage control device for switching a primary fan from variable frequency to industrial frequency, comprising:

[0010] Sensor equipment 1, PLC controller 2, switching device 3, power frequency device 4, frequency converter 5;

[0011] Wherein, the sensor device 1 is connected to the PLC controller 2;

[0012] The PLC controller 2 is connected to the switching device 3;

[0013] The switching device 3 is connected to the power frequency device 4 and the frequency converter 5 respectively;

[0014] The industrial frequency device 4 and the frequency converter 5 are respectively used to connect to the motor of the primary fan.

[0015] Preferably,

[0016] The sensor device 1 includes a rotation speed sensor, a current sensor, and a voltage sensor;

[0017] The speed sensor is arranged at the bearing position of the motor of the primary fan, and is used to obtain the speed information of the motor of the primary fan, and transmit the speed information to the PLC controller 2;

[0018] The current sensor is arranged in the motor cable of the primary fan, and is used to obtain the current signal of the motor of the primary fan, and transmit the current signal to the PLC controller 2;

[0019] The voltage sensor is arranged in the power supply circuit of the motor of the primary fan, and is used to obtain the voltage signal of the power supply circuit of the motor of the primary fan, and transmit the voltage signal to the PLC controller 2.

[0020] Preferably,

[0021] The PLC controller 2 is a Siemens S7-1500 PLC controller.

[0022] Preferably,

[0023] The switching device 3 includes a switching switch and a contactor connected in sequence;

[0024] The switch is also connected to the power supply circuit of the motor of the primary fan.

[0025] Preferably,

[0026] The switch is an ABB switch;

[0027] The contactor is a Schneider Electric contactor.

[0028] Preferably,

[0029] Wherein, the control terminal of the ABB switch is connected to the PLC controller 2 via a cable;

[0030] The power terminal of the ABB switch is connected to the power supply line of the motor of the primary fan through a cable;

[0031] The control terminal of the contactor is connected to the PLC controller 2 via a cable;

[0032] The input contact terminal of the contactor is connected to the control terminal of the ABB switch through a cable, the first output contact terminal of the contactor is connected to the control terminal of the frequency converter 5 through a cable; the second output contact terminal of the contactor is connected to the control terminal of the power frequency converter 4 through a cable.

[0033] Preferably,

[0034] The output terminal of the frequency converter 5 is used to connect to the motor of the primary fan to transmit the electric energy output by the frequency converter 5 to the motor;

[0035] The output terminal of the power frequency converter 4 is used to be connected to the motor of the primary fan to transmit the electric energy output by the power frequency converter 4 to the motor.

[0036] Preferably,

[0037] The switching device 3 also includes a protection device;

[0038] The protection device is connected between the switch and the contactor;

[0039] The protection device is a Schneider Electric safety relay.

[0040] Preferably, the sensor device 1 of the intelligent linkage control device further includes: a damper door position sensor installed at the bearing position of the damper door at the air inlet of the primary fan, for real-time monitoring of the opening of the damper door at the air inlet of the primary fan;

[0041] Wherein, the baffle door position sensor is also connected to the PLC controller 2;

[0042] The PLC controller 2 is also connected to a damper door actuator 6 installed at the air inlet of the primary fan, and is used to control the opening and closing of the damper door through the damper door actuator 6.

[0043] Preferably, the PLC controller 2 is also connected to a SCADA system.

[0044] (III) Beneficial effects

[0045] The intelligent linkage control device for switching from frequency conversion to industrial frequency provided by the utility model connects the sensor device, PLC controller, switching device, industrial frequency device and inverter together through a clear connection relationship to form a clear architecture. This helps to reduce the complexity of the intelligent linkage control device and makes the intelligent linkage control device easier to understand and maintain.

[0046] The intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan provided by the utility model uses the industrial frequency device and the frequency converter to connect the motor of the primary fan respectively, so that the intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan provided by the utility model has flexible control capability. The operating frequency of the fan can be switched at any time as needed, thereby meeting the needs under different working conditions.

[0047] The utility model provides an intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan. The PLC controller is used as the control core and is connected with sensor equipment, switching devices, industrial frequency devices, frequency converters and other equipment to achieve intelligent linkage control. At the same time, the clear connection relationship between the devices helps to reduce the possibility of misoperation and failure, thereby improving the stability and reliability of the intelligent linkage control device. Any connection problems or equipment failures can be more easily identified and resolved, reducing the operating risks of the intelligent linkage control device.

[0048] The intelligent linkage control device for switching a primary fan from frequency conversion to industrial frequency provided by the utility model reduces the difficulty of maintenance and repair of the intelligent linkage control device through reasonable connection relationship and structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural schematic diagram of an intelligent linkage control device for switching a primary fan from frequency conversion to industrial frequency provided by the utility model.

[0050] Description of reference numerals:

[0051] 1: Sensor equipment;

[0052] 2: PLC controller;

[0053] 3: Switching device;

[0054] 4: Power frequency device;

[0055] 5: Frequency converter;

[0056] 6: Baffle door actuator. DETAILED DESCRIPTION

[0057] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0058] like Figure 1 As shown, the utility model provides an intelligent linkage control device for switching a primary fan from variable frequency to industrial frequency, comprising:

[0059] Sensor equipment 1, PLC controller 2, switching device 3, power frequency device 4, frequency converter 5;

[0060] Wherein, the sensor device 1 is connected to the PLC controller 2;

[0061] The PLC controller 2 is connected to the switching device 3;

[0062] The switching device 3 is connected to the power frequency device 4 and the frequency converter 5 respectively;

[0063] The industrial frequency device 4 and the frequency converter 5 are respectively used to connect to the motor of the primary fan.

[0064] In this embodiment, the sensor device is connected to the PLC controller, the PLC controller is connected to the switching device, the switching device is connected to the power frequency device and the frequency converter respectively, the power frequency device and the frequency converter are connected to the motor of the primary fan respectively, and this connection method can realize the intelligent linkage control of the primary fan frequency conversion to power frequency switching. This method of connection according to functional division makes the functions between each part clear and easy to manage and maintain. In addition, in this embodiment, the data collected by the sensor device needs to be transmitted to the PLC controller for processing, and then the control signal is transmitted to the switching device via the PLC controller, and then the power frequency device and the frequency converter are controlled by the switching device. This signal transmission path is reasonable and clear, which is conducive to the stability and reliability of the intelligent linkage control device. Moreover, in this embodiment, each device of the intelligent linkage control device only needs to be connected to the device associated with it, and there will be no chaotic connection situation, which simplifies the installation and maintenance process and reduces the possibility of errors. The connection between each component is clear and clear. Once a fault occurs or maintenance is required, it is easy to locate the specific component, which improves the efficiency of fault diagnosis and maintenance. It reduces the possibility of unnecessary interference and misoperation, which helps to improve the stability and reliability of the system.

[0065] Specifically, the sensor device 1 includes a rotation speed sensor, a current sensor, and a voltage sensor;

[0066] The speed sensor is arranged at the bearing position of the motor of the primary fan, and is used to obtain the speed information of the motor of the primary fan, and transmit the speed information to the PLC controller 2;

[0067] The current sensor is arranged in the motor cable of the primary fan, and is used to obtain the current signal of the motor of the primary fan, and transmit the current signal to the PLC controller 2;

[0068] The voltage sensor is arranged in the power supply circuit of the motor of the primary fan, and is used to obtain the voltage signal of the power supply circuit of the motor of the primary fan, and transmit the voltage signal to the PLC controller 2.

[0069] In this embodiment, the power supply circuit refers to the power supply circuit of the motor of the primary fan. This circuit is responsible for transmitting electrical energy to the motor of the primary fan to drive it to operate normally.

[0070] The utility model provides a sensor device in an intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan, including a speed sensor, a current sensor, and a voltage sensor, which can comprehensively monitor the operating status of the primary fan from multiple aspects. The speed sensor monitors the speed of the motor, the current sensor monitors the current signal of the motor, and the voltage sensor monitors the voltage signal of the motor power supply line. These data can comprehensively reflect the working condition of the primary fan. During the application process, the collected data such as speed, current and voltage are transmitted to the PLC controller, realizing centralized management and processing of data. The PLC controller can perform logical judgment and control operations based on these data, thereby realizing intelligent linkage control of the primary fan.

[0071] The utility model provides an intelligent linkage control device for switching the primary fan from variable frequency to industrial frequency. The data collected by the sensor equipment can be transmitted to the PLC controller in real time, ensuring timely monitoring and feedback of the operating status of the primary fan, helping to timely discover and solve problems that may occur in the primary fan, and improving the reliability and stability of the intelligent linkage control device. By monitoring parameters such as speed, current and voltage, possible faults and abnormal conditions of the primary fan can be discovered in time, which is conducive to fault diagnosis and maintenance, reducing the impact of faults on the intelligent linkage control device, and improving the reliability and maintainability of the intelligent linkage control device.

[0072] The PLC controller 2 is a Siemens S7-1500 PLC controller.

[0073] In this embodiment, the Siemens S7-1500 PLC controller is a high-end product of Siemens with excellent performance and reliability. It uses advanced processors and communication technologies, can quickly and accurately perform control tasks, and is suitable for complex industrial automation applications. The S7-1500 series PLC controller has a modular design and supports a variety of different types of digital and analog input / output modules, which can be flexibly expanded and configured according to actual needs. This means that the number and type of connections of sensor devices can be easily expanded when needed to meet different application scenarios. The S7-1500 PLC controller supports a variety of communication interfaces and protocols, and can reliably exchange and communicate data with other devices (such as sensors, actuators, host computers, etc.), realize efficient interconnection between devices, and thus better realize intelligent linkage control.

[0074] The switching device 3 includes a switching switch and a contactor connected in sequence;

[0075] The switch is also connected to the power supply circuit of the motor of the primary fan.

[0076] In this embodiment, the switching switch and the contactor are combined together to realize the switching and control of the circuit more conveniently. The contactor is usually used to control the high current circuit, and the switching switch can conveniently control the switching of the circuit manually or automatically, so as to ensure that the power supply can be quickly switched when needed to ensure the safe operation of the equipment.

[0077] The switch is an ABB switch;

[0078] The contactor is a Schneider Electric contactor.

[0079] In this embodiment, the ABB switching switch has various types and specifications, including manual switching switches and automatic switching switches, etc. High-quality materials and advanced manufacturing processes are usually used, with reliable performance and long life. ABB switching switches can be used in various occasions, including industrial automation, power systems, building facilities, etc., to meet the electrical control needs in different scenarios. Schneider Electric contactors have various types and specifications, including AC contactors, DC contactors, thermal relays, etc. They have high reliability, safety and durability, and are suitable for various industrial environments and application scenarios. Schneider Electric contactors adopt advanced design and manufacturing processes, with fast action speed, stable contact performance and good durability, which can ensure the safe operation and stable control of electrical systems. As products of well-known electrical equipment manufacturers, ABB switching switches and Schneider Electric contactors have been widely used in industrial control systems. They have excellent performance and reliability, can meet complex electrical control needs, and are an important part of the field of industrial automation.

[0080] Wherein, the control terminal of the ABB switch is connected to the PLC controller 2 via a cable;

[0081] The power terminal of the ABB switch is connected to the power supply line of the motor of the primary fan through a cable;

[0082] The control terminal of the contactor is connected to the PLC controller 2 via a cable;

[0083] The input contact terminal of the contactor is connected to the control terminal of the ABB switch through a cable, the first output contact terminal of the contactor is connected to the control terminal of the frequency converter 5 through a cable; the second output contact terminal of the contactor is connected to the control terminal of the power frequency converter 4 through a cable.

[0084] Because the PLC controller needs to be able to receive and send signals to control the operation of the switch, the control terminal of the ABB switch is connected to the PLC controller 2 via a cable. The switch needs to be connected to the power supply line of the motor to control the switching state of the power supply. In this embodiment, the power supply terminal of the ABB switch is connected to the power supply line of the motor of the primary fan via a cable. The operation of the contactor needs to be controlled by the PLC controller, so the control terminal of the contactor in this embodiment is connected to the PLC controller 2 via a cable. Since the operation of the contactor needs to be triggered according to the state of the switch, the input contact terminal of the contactor is connected to the control terminal of the ABB switch via a cable. The first output contact terminal of the contactor is connected to the control terminal of the frequency converter 5 via a cable to realize that the output of the contactor needs to be connected to the frequency converter to control its working state. The second output contact terminal of the contactor is connected to the control terminal of the power frequency converter 4 via a cable, because the output of the contactor also needs to be connected to the power frequency converter to control its working state.

[0085] The output terminal of the frequency converter 5 in this embodiment is used to connect to the motor of the primary fan to transmit the electric energy output by the frequency converter 5 to the motor;

[0086] The output terminal of the power frequency converter 4 is used to be connected to the motor of the primary fan to transmit the electric energy output by the power frequency converter 4 to the motor.

[0087] Specifically, in this embodiment, the two output terminals transmit the electric energy output by the frequency converter and the industrial frequency converter to the motor of the primary fan, thereby driving the motor to operate normally. This connection method allows the motor of the primary fan to obtain electric energy from the frequency converter or the industrial frequency converter as needed, and realizes the adjustment of the frequency and voltage when the motor is running, thereby realizing the switching of the variable frequency to the industrial frequency of the primary fan and ensuring the normal operation of the fan.

[0088] In this embodiment, the switching device 3 also includes a protection device;

[0089] The protection device is connected between the switch and the contactor.

[0090] In the switching device 3, in addition to the switching switch and the contactor, a protection device is also included. The function of this protection device is to protect the system from damage or failure during the switching process or under certain conditions.

[0091] Specifically, the protection device is connected between the transfer switch and the contactor, which means that it is located between the two, possibly connected by cables or wires. This connection allows the protection device to monitor the circuit status between the transfer switch and the contactor and trigger protective measures when necessary. For example, if a fault or abnormal condition occurs in the switching device, the protection device may disconnect the circuit to prevent damage to the primary fan or other components.

[0092] Specifically, the protection device is a Schneider Electric safety relay.

[0093] In this intelligent linkage control device, the Schneider Electric safety relay is connected between the transfer switch and the contactor to protect the circuit. It can monitor the current, voltage or other parameters during the switching process and cut off the circuit when necessary to prevent system damage or accidents. As part of the protection device, the Schneider Electric safety relay helps to improve the safety and stability of the system and protect key equipment from damage or failure.

[0094] In this embodiment, the sensor device 1 of the intelligent linkage control device for switching the primary fan from variable frequency to industrial frequency provided by the utility model also includes: a damper door position sensor installed at the bearing position of the damper door at the air inlet of the primary fan, which is used to monitor the opening of the damper door at the air inlet of the primary fan in real time;

[0095] Wherein, the baffle door position sensor is also connected to the PLC controller 2;

[0096] The PLC controller 2 is also connected to a damper door actuator 6 installed at the air inlet of the primary fan, and is used to control the opening and closing of the damper door through the damper door actuator 6.

[0097] In this embodiment, the damper door position sensor is used to monitor the opening of the damper door at the inlet of the primary fan in real time. This damper door sensor can measure the angle or position of the damper door, and transmit these data to the PLC controller so as to adjust the opening of the damper door as needed. The damper door actuator 6 is used to automatically adjust the opening of the damper door according to the instructions sent by the PLC controller. This actuator can adjust the position of the damper door as needed to maintain the stability of the primary fan output. This embodiment provides a hardware foundation for automatically adjusting the damper door opening during the switching process of the primary fan from variable frequency to industrial frequency through the connection of the damper door position sensor, the PLC controller, and the damper door actuator 6, thereby ensuring the stability of the primary fan output and the stability of the primary fan outlet pressure, and realizing intelligent linkage control.

[0098] In this embodiment, the damper door actuator 6 is installed at the air inlet of the primary fan to control the opening and closing of the damper door. In this embodiment, the damper door actuator 6 includes an electric actuator or a pneumatic actuator. The electric actuator is used as an example: the electric actuator is usually composed of an electric motor, a reduction mechanism and a transmission rod, and has a power line and a control line for receiving control signals and driving the opening and closing movement of the damper door. The electric actuator is installed on the side or bottom of the damper door and is connected to the damper door through a transmission rod or a gear system. The damper door actuator 6 in this embodiment can also adopt an existing structure, which is not specifically limited.

[0099] In this embodiment, the utility model provides an intelligent linkage control device for switching a primary fan from variable frequency to industrial frequency, wherein the PLC controller 2 is also connected to a SCADA system.

[0100] The PLC controller 2 is connected to the SCADA system, which is very important for monitoring and managing industrial processes. SCADA (Supervisory Control and Data Acquisition) can monitor and control the PLC controller 2 and other equipment in real time, and can also collect and record a large amount of data to help operators make decisions and optimize the production process. This integration can improve production efficiency, ensure the safety of intelligent linkage control devices, and be able to quickly respond to any potential problems.

[0101] In this embodiment, the SCADA system can record historical data and identify potential trends and problems by analyzing these data, thereby helping to optimize the production process and predict equipment failures. Through the SCADA system, operators can remotely access the PLC controller 2, so that industrial processes can be monitored and controlled anywhere. This remote access function can improve the flexibility and responsiveness of production. The SCADA system can be configured with alarm and notification functions, and when abnormal situations occur, relevant personnel can be notified in time to help them take quick action to solve the problem. The SCADA system usually provides a customizable user interface, and operators can configure the display information according to their needs and preferences to make it more in line with actual operation requirements. In short, the PLC controller 2 connected to the SCADA system can achieve more advanced monitoring, control and optimization functions, thereby improving the efficiency and reliability of industrial production.

[0102] In the intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan in this embodiment, a speed sensor, a current sensor and a voltage sensor are respectively installed on the motor of the primary fan during actual use, and are used to monitor the speed, current and voltage parameters of the motor. The data collected by these sensors are transmitted to the PLC controller for subsequent logical judgment and control operations. The PLC controller receives the data collected by the sensor and processes and judges according to the preset control logic. For example, according to the changes in parameters such as speed, current and voltage, the PLC controller can determine whether it is necessary to switch the working mode of the primary fan (these control logics are also existing technologies and need not be repeated here). According to the logical judgment of the PLC controller, the switching device is responsible for controlling the state of the switching switch and the contactor. When it is necessary to switch the primary fan from the variable frequency mode to the industrial frequency mode, the switching device triggers the corresponding operation, so that the circuit is switched from the frequency converter to the industrial frequency converter. The switching device is also responsible for controlling the power supply line of the motor. When switching to the industrial frequency mode, the switching device connects the circuit to the industrial frequency converter, thereby transmitting the output power of the industrial frequency converter to the motor, so that the motor runs at the frequency of the industrial frequency. The protection device is responsible for monitoring the circuit status during the switching process and triggering protection measures when necessary. For example, when an abnormal situation is detected during the switching process, the protection device may cut off the circuit to prevent equipment damage or accidents. The PLC controller is also connected to the SCADA system, which enables real-time monitoring and remote management of the entire system, thereby better optimizing the production process and ensuring safe and stable operation of the system.

[0103] In summary, through the steps of sensor data acquisition, PLC control logic, switching device control, motor power supply switching, protection device monitoring and SCADA system integration, the intelligent linkage control device can realize the switching of the primary fan frequency conversion to the industrial frequency and ensure the stability and reliability of the system. It should be noted that this embodiment does not involve any computer program and control improvement and use, but only provides the connection relationship and structural layout design between the sensor equipment, PLC controller, switching device, industrial frequency device, inverter, etc.

[0104] The intelligent linkage control device for switching the primary fan frequency conversion to industrial frequency in this embodiment is arranged in a control cabinet, which is made of metal (such as steel plate) or plastic. The steel control cabinet has good durability and corrosion resistance, while the plastic control cabinet is lighter and has better insulation performance. The cabinet door of the control cabinet also has a transparent window or observation hole so that the operator can observe the internal equipment status without opening the cabinet door. At the same time, the control cabinet is equipped with vents or fans to promote air circulation and discharge heat. The cabinet door and side walls should be designed with appropriate heat dissipation holes to enhance the heat dissipation effect. Appropriate brackets and fixtures are provided in the control cabinet for each device in the intelligent linkage control device to ensure that the equipment is firmly installed in the predetermined position. The brackets and fixtures are usually made of metal and have sufficient strength and stability. For heavier equipment, additional support structures may be required to enhance fixation.

[0105] The intelligent linkage control device for switching from frequency conversion to industrial frequency provided by the utility model connects the sensor device, PLC controller, switching device, industrial frequency device and inverter together through a clear connection relationship to form a clear architecture. This helps to reduce the complexity of the intelligent linkage control device and makes the intelligent linkage control device easier to understand and maintain.

[0106] The intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan provided by the utility model uses the industrial frequency device and the frequency converter to connect the motor of the primary fan respectively, so that the intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan provided by the utility model has flexible control capability. The operating frequency of the fan can be switched at any time as needed, thereby meeting the needs under different working conditions.

[0107] The utility model provides an intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan. The PLC controller is used as the control core and is connected with sensor equipment, switching devices, industrial frequency devices, frequency converters and other equipment to achieve intelligent linkage control. At the same time, the clear connection relationship between the devices helps to reduce the possibility of misoperation and failure, thereby improving the stability and reliability of the intelligent linkage control device. Any connection problems or equipment failures can be more easily identified and resolved, reducing the operating risks of the intelligent linkage control device.

[0108] The intelligent linkage control device for switching a primary fan from frequency conversion to industrial frequency provided by the utility model reduces the difficulty of maintenance and repair of the intelligent linkage control device through reasonable connection relationship and structural design.

[0109] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a combined manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0110] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An intelligent linkage control device for switching from frequency conversion to industrial frequency of a primary fan, characterized in that: include: Sensor equipment (1), PLC controller (2), switching device (3), power frequency device (4), frequency converter (5); Wherein, the sensor device (1) is connected to the PLC controller (2); The PLC controller (2) is connected to the switching device (3); The switching device (3) is connected to the power frequency device (4) and the frequency converter (5) respectively; The industrial frequency device (4) and the frequency converter (5) are respectively used to connect the motor of the primary fan.

2. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 1 is characterized in that: The sensor device (1) comprises a rotation speed sensor, a current sensor, and a voltage sensor; The speed sensor is arranged at a bearing position of a motor of the primary fan, and is used to obtain speed information of the motor of the primary fan, and transmit the speed information to a PLC controller (2); The current sensor is arranged in the motor cable of the primary fan, and is used to obtain the current signal of the motor of the primary fan, and transmit the current signal to the PLC controller (2); The voltage sensor is arranged in the power supply circuit of the motor of the primary fan, and is used to obtain the voltage signal of the power supply circuit of the motor of the primary fan, and transmit the voltage signal to the PLC controller (2).

3. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 2, characterized in that: The PLC controller (2) is a Siemens S7-1500 PLC controller.

4. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 3 is characterized in that: The switching device (3) comprises a switching switch and a contactor connected in sequence; The switch is also connected to the power supply circuit of the motor of the primary fan.

5. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 4, characterized in that: The switch is an ABB switch; The contactor is a Schneider Electric contactor.

6. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 5, It is characterized in that Wherein, the control terminal of the ABB switch is connected to the PLC controller (2) via a cable; The power terminal of the ABB switch is connected to the power supply line of the motor of the primary fan through a cable; The control terminal of the contactor is connected to the PLC controller (2) via a cable; The input contact terminal of the contactor is connected to the control terminal of the ABB switch through a cable, the first output contact terminal of the contactor is connected to the control terminal of the frequency converter (5) through a cable; and the second output contact terminal of the contactor is connected to the control terminal of the power frequency converter (4) through a cable.

7. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 6, characterized in that: The output terminal of the frequency converter (5) is used to be connected to the motor of the primary fan, and transmit the electric energy output by the frequency converter (5) to the motor; The output terminal of the power frequency converter (4) is used to be connected to the motor of the primary fan, and transmit the electric energy output by the power frequency converter (4) to the motor.

8. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 7, characterized in that: The switching device (3) also includes a protection device; The protection device is connected between the switch and the contactor; The protection device is a Schneider Electric safety relay.

9. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 8, characterized in that: The sensor device (1) of the intelligent linkage control device also includes: a damper door position sensor installed at the bearing position of the damper door at the air inlet of the primary fan and used for real-time monitoring of the opening of the damper door at the air inlet of the primary fan; Wherein, the baffle door position sensor is also connected to the PLC controller (2); The PLC controller (2) is also connected to a damper door actuator (6) installed at the air inlet of the primary fan, and is used to control the opening and closing of the damper door through the damper door actuator (6).

10. The intelligent linkage control device for switching from variable frequency to industrial frequency of a primary fan according to claim 9, characterized in that: The PLC controller (2) is also connected to a SCADA system.

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