A frequency conversion system control device of a hot air dryer with humidity control

Abstract

The utility model belongs to drying -machine control technical field, concretely relates to a kind of frequency conversion system control device of hot air dryer with humidity control. Including the control module with single-chip microcontroller as core, and with its electric connection power module, monitoring module, sensor module, execution module and man-machine interactive module, external single-phase power supply is accessed through monitoring module, sensor module humidity sensor and thermocouple, signal acquisition end extends to outside;Execution module includes heating control unit, contactor, alarm module and frequency converter module, frequency converter connects asynchronous motor and is electrically connected with single-chip microcontroller. Power module is fixed on the side of control module, the distance between frequency converter and power module is not more than 10cm;Man-machine interactive module contains display screen, LED indicator light group and operating button, both sides are provided with heat dissipation grid;Control module integrates WiFi communication module. The device realizes power monitoring, temperature and humidity acquisition, frequency conversion speed regulation and remote monitoring, improves system security, data precision and response speed.

Description

Technical Field

[0001] This utility model belongs to the field of dryer control technology, specifically relating to a frequency converter control device for a hot air dryer with humidity control. Background Technology

[0002] The existing frequency conversion systems of hot air dryers mostly adopt the traditional local control mode. The connection structure between their control modules and monitoring and execution components lacks integrated design, especially in terms of hardware support for remote monitoring and intelligent interaction functions, which makes it impossible to remotely view the dryer's operating status and operation logs.

[0003] A dehumidifying and drying device with wireless communication function, disclosed in patent publication number CN104165439A, further includes a key input module, a drive module, a heater, a fault detection module, a status display circuit, and an input circuit. A humidity sensor is connected to a microprocessor via a corresponding signal conditioning module. The microprocessor is connected to the heater via the drive module. The key input module is connected to the microprocessor. The input terminal of the fault detection module is connected to the heater, and the output terminal is connected to the microprocessor. The microprocessor is also connected to the status display circuit and a host computer via a wireless communication module. The microprocessor is also connected to the input circuit. This invention provides a dehumidifying and drying device with a simple structure, capable of changing the heater temperature as needed, enabling remote control, fault detection, and alarm functions, and featuring wireless communication. However, the aforementioned device cannot remotely monitor the dryer's operating status or display the current working status in a timely manner. Therefore, it is imperative for those skilled in the art to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention aims to solve existing problems, improve the flexibility of remote monitoring of dryers, and reduce the frequency of manual on-site inspections.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A frequency converter control device for a hot air dryer with humidity control includes a control module and a power supply module, a monitoring module, a sensor module, an execution module and a human-machine interaction module electrically connected thereto.

[0007] The control module is based on a microcontroller. An external single-phase 220V power supply is first connected to the monitoring module. The monitoring module is connected in series between the input terminal of the power supply module and the microcontroller, and is fixedly installed on the input side of the control module.

[0008] The sensor module includes two humidity sensors and a thermocouple. The humidity sensors and the thermocouple are connected to the control module and associated with the microcontroller through a line. The signal acquisition end of the humidity sensor extends to the outside of the control module and is fixed.

[0009] The execution module includes a heating control unit, a contactor, a 24V alarm module, and a frequency converter module. The frequency converter module is electrically connected to the control module. The input terminal of the frequency converter module is connected to the power supply module. The output terminal of the frequency converter module is connected to the asynchronous motor and electrically connected to the port of the microcontroller through a control signal line.

[0010] By adopting the above technical solution, the monitoring module is connected in series between the power input terminal and the microcontroller and fixed on the input side. It can prioritize real-time monitoring of power parameters, ensuring that abnormal power signals are detected and processed before entering the core circuit, thereby improving system safety. The sensor signal acquisition terminal extends to the outside and is fixed, facilitating direct contact with the monitoring environment, reducing signal transmission loss, and improving data acquisition accuracy. The frequency converter module is directly connected to the power module and electrically connected to the microcontroller port through the control signal line, shortening the control link, improving the motor speed regulation response speed, and realizing remote monitoring of the dryer's operating status.

[0011] Furthermore, the power module is fixedly installed on one side of the control module, the input terminal of the power module is connected to a single-phase 220V power supply, and the output terminal of the power module is connected to the control module, the frequency converter module and external equipment respectively to form the main circuit;

[0012] The inverter module outputs a three-phase 220V power supply. The housing of the inverter module is fixed to the inner wall of the control module's chassis by bolts, and the distance between the inverter module and the power supply module is no more than 10cm.

[0013] By adopting the above technical solution, the power supply module is fixed on one side of the control module, and the input and output terminals are centrally arranged, which shortens the main circuit wiring length and reduces line loss and electromagnetic interference. The inverter housing is fixed to the inner side wall of the chassis with bolts and the distance between it and the power supply module is no more than 10cm, realizing the compact integration of the power supply and the frequency conversion unit, saving installation space, shortening the power supply line between the two, reducing voltage fluctuations, improving the power supply stability of the asynchronous motor, and ensuring a smooth and reliable speed regulation process.

[0014] Furthermore, the human-computer interaction module includes a 4.3-inch display screen and an LED indicator group. The display screen is embedded in the center of the front panel of the control device and is bidirectionally connected to the LCD interface of the microcontroller via an FPC cable.

[0015] The LED indicator group includes a power indicator, an alarm indicator, and a running indicator, which are arranged side by side on the right side of the display screen. The pins of the LED indicator group are electrically connected to the GPIO interface of the microcontroller, and the height of the LED indicator group is flush with the surface of the display screen.

[0016] The control device is also provided with heat dissipation grilles on both sides;

[0017] The display screen has a heating button, an on / off button, and a power input interface on its left side.

[0018] By adopting the above technical solution, the display screen is embedded in the middle of the front panel and bidirectionally connected to the microcontroller via an FPC cable. The central layout conforms to ergonomics, making it easy for users to intuitively view the system status. The LED indicator lights are arranged side by side on the right side of the display screen at the same height, allowing users to quickly determine the equipment's operating status, such as power on / off and alarm triggering, by observing the color and status of the lights, thus improving information acquisition efficiency. The partitioned layout of the heat dissipation grilles on both sides and the operation buttons on the left side ensures smooth heat dissipation to prevent overheating of components and avoids accidental button presses during operation, thereby improving the reliability and safety of equipment operation.

[0019] Furthermore, the two humidity sensors and thermocouples of the sensor module are connected to the control module through a terminal block. The terminal block is fixed inside the control module on the side near the power module, and its pin definitions correspond one-to-one with the analog input interface of the microcontroller.

[0020] The humidity sensor is integrated into the edge of the control module's motherboard and is directly soldered to the adjacent pins of the microcontroller.

[0021] By adopting the above technical solution, the sensor is connected to the control module through a terminal block, which is close to the power module. The pin definitions correspond one-to-one with the microcontroller interface. The standardized wiring layout reduces installation errors and facilitates quick identification of the circuit during later maintenance. The humidity sensor is integrated on the edge of the motherboard and directly soldered to the microcontroller pins, reducing intermediate connection links, lowering the risk of poor contact, improving the stability and anti-interference ability of environmental humidity signal acquisition, and ensuring the accuracy of humidity control during the drying process.

[0022] Furthermore, the heating control unit and contactor of the execution module are installed side by side in the rear output interface area of ​​the control module. The control signal input terminal of the heating control unit is electrically connected to the output port of the microcontroller through a relay, and its power output terminal is connected to an external heating rod through a copper busbar.

[0023] The 24V alarm module is independently installed below the contactor and connected in series with the main circuit via a wire, with the alarm light directly exposed on the front panel of the control module.

[0024] By adopting the above technical solution, the heating control unit and the contactor are installed side by side in the rear output interface area. The partitioned layout concentrates the high-voltage control lines and avoids cross-interference with the front-end low-voltage signal lines. The heating control unit is connected to the microcontroller through a relay to achieve isolation between high and low voltage, protecting the core control circuit from power surges. The 24V alarm module is independently set below the contactor and connected in series with the main circuit. The alarm signal is directly taken from the main circuit to ensure that the alarm light responds quickly in abnormal conditions. At the same time, it is exposed on the front panel, making it easy for users to intuitively detect faults.

[0025] Furthermore, the control module also includes a WiFi communication module, which is integrated in an adjacent location to the microcontroller.

[0026] By adopting the above technical solution, the WiFi module is integrated into the adjacent position of the microcontroller, shortening the signal transmission path between the wireless communication module and the core processor, reducing data latency and packet loss rate, and improving the stability of remote monitoring, such as real-time status viewing and remote control. The integrated layout saves internal space of the control module, facilitates the miniaturization design of the overall structure, and reduces electromagnetic interference between modules, ensuring the reliable implementation of wireless functions such as OTA upgrades and alarm log uploads.

[0027] This utility model has the following beneficial effects:

[0028] 1. This utility model achieves priority monitoring of power parameters, high-precision acquisition of environmental data, and rapid response of motor speed regulation by connecting the monitoring module in series between the power input terminal and the microcontroller and fixing it on the input side, extending the sensor signal acquisition terminal to the outside and fixing it, and directly connecting the frequency converter module and the power module and electrically connecting it to the microcontroller port through the control signal line. This improves system safety, data acquisition accuracy and control closed-loop efficiency.

[0029] 2. This utility model shortens the main circuit wiring length, reduces line loss and electromagnetic interference, and achieves compact integration of power supply and frequency conversion unit by fixing the power supply module to one side of the control module, centralizing the input and output terminals, and fixing the inverter housing to the inner side wall of the chassis with bolts and keeping the distance between the inverter housing and the power supply module no more than 10cm.

[0030] 3. This utility model embeds the display screen in the middle of the front panel and connects it to the microcontroller bidirectionally via an FPC cable. The LED indicator lights are arranged side by side on the right side of the display screen at the same height. Heat dissipation grilles are set on both sides and operation buttons are arranged on the left side. This conforms to the ergonomic design, improves the intuitiveness of users to view the system status and the convenience of operation, and ensures smooth heat dissipation and operational safety of the equipment.

[0031] 4. By integrating the WiFi module into the adjacent position of the microcontroller, this utility model shortens the signal transmission path between the wireless communication module and the core processor, reduces data latency and packet loss rate, improves the stability of remote monitoring, such as real-time status viewing and remote control, and saves internal space of the control module and reduces electromagnetic interference between modules. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is an internal framework diagram of this utility model;

[0034] Figure 3 This is the circuit structure diagram of this utility model.

[0035] Among them, 1-control device; 11-display screen; 12-heat dissipation grille; 13-LED indicator light group; 14-heating button; 15-on / off button; 16-power input interface. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0037] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0038] Reference Figure 1 , Figure 2 and Figure 3As can be seen, a frequency converter control device for a hot air dryer with humidity control is described. This device is centered on a control module, with a microcontroller as its core component. An external single-phase 220V power supply is first connected in series between the power module input and the microcontroller, and is fixedly installed on the control module's input side. Two humidity sensors and thermocouples from the sensor module are connected to the control module via a terminal block fixed inside the control module near the power module. The terminal block's pin definitions correspond one-to-one with the microcontroller's analog input interface. The humidity sensor is integrated into the edge of the control module's main board and directly soldered to adjacent pins of the microcontroller. The sensor's signal acquisition end extends to the outside of the control module and is fixed. The execution module's heating control unit and contactor are installed side-by-side in the control module's rear output interface area. The heating control unit's control signal input is electrically connected to the microcontroller's output port via a relay, and its power output is connected to an external heating rod via a copper busbar. A 24V alarm module is independently located below the contactor and connected in series with the main circuit via a wire. The alarm light... The inverter module of the execution module is exposed on the front panel of the control module. Its input terminal is connected to the power supply module, and its output terminal is connected to the asynchronous motor and electrically connected to the port of the microcontroller through the control signal line. The housing of the inverter module is fixed to the inner side wall of the control module chassis with bolts, and the distance between it and the power supply module is no more than 10cm. The power supply module is fixedly installed on one side of the control module. Its input terminal is connected to a single-phase 220V power supply, and its output terminal is connected to the control module, the inverter module and external equipment to form the main circuit. The 4.3-inch display screen 11 of the human-machine interaction module is embedded in the middle of the front panel of the control device 1 and is bidirectionally connected to the LCD interface of the microcontroller through the FPC cable. The LED indicator group 13 is arranged side by side on the right side of the display screen 11. Its pins are electrically connected to the GPIO interface of the microcontroller and its height is flush with the surface of the display screen 11. The control device 1 has heat dissipation grilles 12 on both sides. The left side of the display screen 11 has a heating button 14, an on / off button 15 and a power input interface 16. The control module also includes a WiFi communication module integrated in the adjacent position of the microcontroller.

[0039] Reference Figure 2As can be seen, in the overall framework of this device, the control module is the core. Internally, a microcontroller acts as the hub to connect and exchange data between various modules. An external 220V power supply is first connected to the power, voltage, and current monitoring modules, and the monitoring data is transmitted to the microcontroller. Simultaneously, the microcontroller receives input signals from two humidity sensors and thermocouples, and communicates bidirectionally with modules such as WiFi, USB, RTC, FLASH, maintenance port, and NTC through internal interfaces to achieve data transmission and functional expansion. On one hand, the microcontroller drives the screen, buttons, and LEDs for human-machine interaction; on the other hand, it outputs control signals to the heating control, contactor alarm, and 24V alarm modules, and controls the asynchronous motor through the frequency converter module. For the external interface, the input signals from the 220V power supply, buttons, two humidity sensors, and thermocouples are connected to the control module and then associated with the microcontroller. The output signals from the heating control, contactor, 24V alarm, asynchronous motor, and LEDs are directly or indirectly driven by the microcontroller. The screen, as an input / output module, is bidirectionally connected to the microcontroller. Each module achieves signal transmission and functional collaboration with the microcontroller through the definition of internal and external interfaces.

[0040] Reference Figure 3 As can be seen, the single-phase 220V input power supply is first connected to the power module to power the entire system; the power module is also connected to the DFL simplified bare-board frequency converter, which outputs three-phase 220V power; external devices such as humidity sensors (×2), heating control, thermocouples, contactors, and 24V alarms are all connected to the main circuit where the power module is located through wiring, forming signal or control loops; the 4.3-inch display screen is bidirectionally connected to the control circuit, receiving and displaying system information. The control circuit is also connected to the humidity sensor, LED indicator group 13, and buttons to realize parameter detection, status indication, and manual operation functions; the alarm light is directly connected to the main circuit, and the system triggers the alarm signal according to the operating status. The overall circuit uses the power module as the core power supply unit, and integrates sensor signals, operating commands, and actuators through the control circuit to realize the monitoring and control of the equipment.

[0041] Working Principle: This device uses a microcontroller within the control module as its core, and achieves closed-loop control of the frequency converter system for a hot air dryer with humidity control through the collaboration of multiple modules. After an external single-phase 220V power supply is connected, the monitoring module first collects voltage, current, and power parameters in real time and transmits them to the microcontroller to ensure a rapid response in case of power abnormalities to protect the core circuit. In the sensor module, two humidity sensors and thermocouples are connected to the control module via terminal blocks. The humidity sensor signal acquisition end extends to the external environment to collect humidity and temperature data in the drying chamber in real time. After signal conditioning, the data is transmitted to the microcontroller. The humidity sensor is integrated on the edge of the motherboard and directly soldered to the microcontroller pins to reduce signal loss and improve acquisition accuracy. The microcontroller processes the sensor data according to a preset algorithm. On one hand, it drives the execution module through the control signal line. The frequency converter module receives the PWM signal from the microcontroller and adjusts the frequency of the three-phase 220V power supply to control the speed of the asynchronous motor, realizing stepless speed regulation of the fan airflow. At the same time, the heating control unit receives the microcontroller's instructions through a relay to drive the external heating rod to heat, and works with the contactor to realize dynamic adjustment of the heating power. On the other hand, the 24V alarm module is connected in series with the main circuit. When the monitoring module or sensor detects an abnormality such as over-temperature or over-current, the microcontroller triggers an alarm signal, and the alarm light is exposed on the front panel to visually indicate the fault. In the human-machine interface module, the 4.3-inch display screen 11 communicates bidirectionally with the microcontroller's LCD interface via an FPC cable, displaying the set temperature, actual temperature, fan speed, and energy consumption data in real time. The LED indicator group 13 synchronously indicates power on / off, operating status, and alarm information. The heat dissipation grilles 12 on both sides ensure module heat dissipation. The heating button 14 and the on / off button 15 on the left side support local operation, forming a dual control mode of local and remote control with the WiFi communication module. The WiFi module is integrated adjacent to the microcontroller, enabling remote power on / off, parameter setting, energy consumption log viewing, and OTA upgrades. The data transmission latency is low and the anti-interference capability is strong. The system achieves closed-loop control through a PID algorithm. When the sensor detects that the actual temperature and humidity deviate from the set value, the microcontroller adjusts the inverter frequency and heating power in real time. For example, when the humidity is too high, the fan speed is increased to accelerate dehumidification, and when the temperature is too low, the heating power is increased to ensure that the drying process is precise and controllable. At the same time, the RTC module records the running time, accumulates energy consumption data, and feeds it back through the display screen or remote APP.

[0042] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A frequency converter control device for a hot air dryer with humidity control, characterized in that, It includes a control module and a power supply module, a monitoring module, a sensor module, an execution module, and a human-machine interaction module electrically connected to it; The control module is based on a microcontroller. An external single-phase 220V power supply is first connected to the monitoring module. The monitoring module is connected in series between the input terminal of the power supply module and the microcontroller, and is fixedly installed on the input side of the control module. The sensor module includes two humidity sensors and a thermocouple. The humidity sensors and the thermocouple are connected to the control module and associated with the microcontroller through a line. The signal acquisition end of the humidity sensor extends to the outside of the control module and is fixed. The execution module includes a heating control unit, a contactor, a 24V alarm module, and a frequency converter module. The frequency converter module is electrically connected to the control module. The input terminal of the frequency converter module is connected to the power supply module. The output terminal of the frequency converter module is connected to the asynchronous motor and electrically connected to the port of the microcontroller through a control signal line.

2. The frequency converter control device for a hot air dryer with humidity control according to claim 1, characterized in that, The power module is fixedly installed on one side of the control module. The input terminal of the power module is connected to a single-phase 220V power supply, and the output terminal of the power module is connected to the control module, the frequency converter module and external equipment to form the main circuit. The inverter module outputs a three-phase 220V power supply. The housing of the inverter module is fixed to the inner wall of the control module's chassis by bolts, and the distance between the inverter module and the power supply module is no more than 10cm.

3. The frequency converter control device for a hot air dryer with humidity control according to claim 1, characterized in that, The human-computer interaction module includes a 4.3-inch display screen (11) and an LED indicator group (13). The display screen (11) is embedded in the middle of the front panel of the control device (1) and is bidirectionally connected to the LCD interface of the microcontroller through an FPC cable. The LED indicator group (13) includes a power light, an alarm light and a running light, which are arranged side by side on the right side of the display screen (11). The pins of the LED indicator group (13) are electrically connected to the GPIO interface of the microcontroller. The height of the LED indicator group (13) is flush with the surface of the display screen (11). The control device (1) is also provided with heat dissipation grilles (12) on both sides; The display screen (11) is provided with a heating button (14), an on / off button (15), and a power input interface (16) on the left side.

4. The frequency converter control device for a hot air dryer with humidity control according to claim 1, characterized in that, The two humidity sensors and thermocouples of the sensor module are connected to the control module through a terminal block. The terminal block is fixed inside the control module on the side near the power module, and its pin definitions correspond one-to-one with the analog input interface of the microcontroller. The humidity sensor is integrated into the edge of the control module's motherboard and is directly soldered to the adjacent pins of the microcontroller.

5. The frequency converter control device for a hot air dryer with humidity control according to claim 1, characterized in that, The heating control unit and contactor of the execution module are installed side by side in the rear output interface area of ​​the control module. The control signal input terminal of the heating control unit is electrically connected to the output port of the microcontroller through a relay, and its power output terminal is connected to an external heating rod through a copper busbar. The 24V alarm module is independently installed below the contactor and connected in series with the main circuit via a wire, with the alarm light directly exposed on the front panel of the control module.

6. The frequency converter control device for a hot air dryer with humidity control according to claim 1, characterized in that, The control module also includes a WiFi communication module, which is integrated in an adjacent location to the microcontroller.

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