Multifunctional interlocking control device for autonomously regulating and controlling frequency conversion of draught fan

Abstract

The utility model provides a multifunctional interlocking control device for automatically regulating and controlling frequency conversion of a fan, which comprises a pressure transmitter, a flow sensor and a temperature sensor, the pressure transmitter is connected with a pressure control instrument, the flow sensor is connected with a flow control instrument, and the temperature sensor is connected with a temperature control instrument. The pressure control instrument, the flow control instrument and the temperature control instrument are respectively connected with the frequency converter, and the frequency converter is connected with the fan. Through combination of various index detection electrical elements, physical signals of pressure, flow and temperature are converted into electric signals, use requirements in different environments can be met, real-time automatic adjustment of the fan is achieved in the environment that external environment physical information constantly changes, meanwhile, a two-way feedback mechanism is provided, and the system is convenient to use. The automatic control system is simple, effective, high in reliability and high in safety coefficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical control equipment, and in particular relates to a multifunctional interlocking control device for autonomously regulating fan frequency conversion. Background Art

[0002] A wide variety of smelting equipment is used in nonferrous metallurgical production, with fans being the most common and frequently used. Their primary function is to provide the necessary air volume and pressure to support gas transportation and combustion during the smelting process. By delivering high-pressure, high-temperature gases, they facilitate key process steps such as smelting and combustion, ensuring smooth production. Fans are widely used in the metallurgical industry due to their following features and technical advantages: High-pressure output: Fans can deliver high outlet pressures, making them suitable for industrial applications requiring high-pressure, high-temperature gas transportation; High stability: The fan's impeller is dynamically balanced to ensure stable operation; and Easy maintenance: The fan's structural design is designed for easy maintenance, facilitating routine inspection and maintenance. These features and advantages make fans indispensable in nonferrous metal smelting, supporting efficient and environmentally friendly production processes. This is particularly true for waste gas treatment during the smelting process, where fans are used to transport exhaust gases generated during the smelting process to an exhaust gas absorption tower for treatment. Once these gases meet standards, they are discharged to ensure normal production. Among the fans currently in use, most are direct-start fans, which means they maintain a fixed speed after being powered on. Many companies have added inverter control in subsequent modifications to achieve speed regulation, but they still have to make adjustments manually through handheld operators, and still cannot achieve autonomous operation according to production conditions. The problem is that the fan always runs at high load, causing waste of electricity and frequent operations. In order to solve this bottleneck problem, it is necessary to consider adjusting the fan operation in conjunction with changes in specific production conditions, and at the same time increase the chain to achieve autonomous operation of the fan.

[0003] The utility model patent, patent publication number CN206738205U, entitled "A Multifunctional Intelligent Fan Controller," specifically discloses a multifunctional intelligent fan controller comprising an MCU control chip, an external display, a power input module, a sensor input module, an alarm input module, a PWM control output module, and a relay control output module. The external display is connected to the MCU control chip, the power input module is connected to the MCU control chip, the sensor input module and the alarm input module are connected to the MCU control chip, the PWM control output module is connected to the MCU control chip, and the relay control output module is connected to the MCU control chip. While the utility model not only provides standard temperature and humidity sensing, it also enhances temperature sensing, making overall fan control more precise. It also features a multi-channel switch alarm that, in addition to temperature and humidity sensing, can generate alarms for other environmental factors. However, this only provides alarms for environmental changes and fails to automatically adjust the fan to these changes, nor does it enable automatic operation after the external environment returns to normal.

[0004] Patent publication number CN202326340U, entitled "A Variable Frequency Automatic Control Device for a Fan," discloses a variable frequency automatic control device for a fan. The device includes a fan and features a control circuit board with a chip and a temperature sensor. The control circuit board incorporates a DC-AC inverter consisting of a forward converter circuit, an intermediate filter circuit, and an inverter circuit. The forward converter circuit and the inverter circuit utilize a thyristor three-phase bridge circuit, and the intermediate filter circuit comprises a capacitor or reactor. This device measures the indoor temperature of the main transformer and uses a variable frequency device to control the fan's start, stop, and speed. This effectively addresses issues such as excessive fan noise and high energy consumption, reduces maintenance workload, and reduces the workload for operators. Compared to this utility model, the aforementioned patent only addresses temperature control, not pressure or flow rate. Furthermore, it lacks a dual feedback mechanism. When the temperature drops, the fan automatically reduces its operating frequency, achieving continuous, cyclic operation rather than shutdown. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a multifunctional interlocking control device for autonomously regulating fan frequency conversion.

[0006] The technical solution of the utility model is achieved as follows: a multifunctional interlocking control device for autonomously regulating fan frequency conversion, comprising a pressure transmitter, a flow sensor, and a temperature sensor, wherein the pressure transmitter is connected to a pressure control instrument, the flow sensor is connected to a flow control instrument, the temperature sensor is connected to a temperature control instrument, the pressure control instrument, the flow control instrument, and the temperature control instrument are respectively connected to a frequency converter, the frequency converter is connected to the fan, and one end of the pressure transmitter, the flow sensor, and the temperature sensor are respectively connected to the interior of the equipment required for interlocking control;

[0007] Preferably, the pressure transmitter, flow sensor and temperature sensor sense the change signal and convert it into an electrical signal, which is transmitted to each control instrument in the form of an electrical signal. Each instrument is closed and the output frequency of the frequency converter is controlled according to the strength of the electrical signal to adjust the speed of the fan.

[0008] Preferably, it may also include a temperature sensor, a smoke sensor and a control instrument thereof.

[0009] The beneficial effects of the present invention are as follows: the present invention converts the physical signals of pressure, flow and temperature into electrical signals through a combination of multiple indicator detection electrical components, which can meet the use requirements in different environments, and at the same time meet the real-time autonomous adjustment of the fan in an environment where the physical information of the external environment is constantly changing. At the same time, it has a two-way feedback mechanism to achieve non-stop cycle operation, achieve the purpose of automatic control, and achieve energy-saving effects. The present invention is simple and effective, with high reliability and high safety factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 This is the electrical circuit diagram of the utility model.

[0012] Parts description: 1. Pressure transmitter, 2. Pressure control instrument, 3. Flow sensor, 4. Flow control instrument, 5. Temperature sensor, 6. Temperature control instrument, 7. Frequency converter, 8. Fan. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0015] Refer to the attached Figure 1-2 A multifunctional interlocking control device for autonomously regulating fan frequency conversion includes a pressure transmitter 1, a flow sensor 3 and a temperature sensor 5. The pressure transmitter 1 is connected to the pressure control instrument 2, the flow sensor 3 is connected to the flow control instrument 4, the temperature sensor 5 is connected to the temperature control instrument 6, the pressure control instrument 2, the flow control instrument 4 and the temperature control instrument 6 are respectively connected to the frequency converter 7, the frequency converter 7 is connected to the fan 8, and one end of the pressure transmitter 1, the flow sensor 3 and the temperature sensor 5 are respectively connected to the inside of the equipment required for interlocking control.

[0016] Specifically, pressure transmitter 1 is connected to pressure control instrument 2, which is in turn connected to frequency converter 7. One end of pressure transmitter 1 is connected to the internal part of the interlocking device. When the operating pressure inside the device changes, the pressure transmitter senses the pressure change signal, converts it into an electrical signal, and transmits it to pressure control instrument 2. Pressure control instrument 2 closes, and the output frequency of frequency converter 7, and thus the speed of fan 8, is controlled based on the strength of the electrical signal. When the ambient pressure decreases, the signal is transmitted to the fan through the pressure transmitter, pressure control instrument, and frequency converter, causing the fan to automatically reduce its operating frequency.

[0017] Flow sensor 3 is connected to flow control instrument 4, which is in turn connected to frequency converter 7. One end of the flow sensor is connected to the internal equipment to be interlocked. When the operating flow rate within the equipment changes, the flow sensor senses the flow change signal and converts it into an electrical signal. This signal is then transmitted to the flow control instrument, which closes the flow control instrument. The frequency converter output frequency is then controlled based on the strength of the electrical signal, adjusting the fan speed. When the ambient flow rate decreases, a signal is transmitted to the fan via the flow sensor, flow control instrument, and frequency converter, causing the fan to automatically reduce its operating frequency.

[0018] Temperature sensor 5 is connected to temperature control instrument 6, which is in turn connected to frequency converter 7. One end of the temperature sensor is connected to the internal part of the interlocked device. When the internal operating temperature of the device changes, the temperature sensor senses the temperature change and converts it into an electrical signal. This signal is then transmitted to the temperature control instrument, which then switches on. The frequency converter output frequency is then controlled based on the strength of the electrical signal, adjusting the fan speed. When the ambient temperature drops, a signal is transmitted to the fan via the temperature sensor, temperature control instrument, and frequency converter, causing the fan to automatically reduce its operating frequency.

[0019] In addition to pressure, flow, and temperature, other linkages can also be added, such as humidity sensors, smoke sensors, etc., to adjust the fan according to changes in humidity and smoke.

[0020] This interlocking device is equipped with a pressure transmitter 1, a flow sensor 3, and a temperature sensor 5, which can be selected according to actual conditions. For example, the pressure transmitter 1 is suitable for closed equipment, the flow sensor 3 is suitable for pipeline equipment, and the temperature sensor 5 is suitable for heating equipment.

[0021] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional interlocking control device for autonomously regulating fan frequency conversion, characterized in that The invention comprises a pressure transmitter (1), a flow sensor (3) and a temperature sensor (5), wherein the pressure transmitter (1) is connected to a pressure control instrument (2), the flow sensor (3) is connected to a flow control instrument (4), the temperature sensor (5) is connected to a temperature control instrument (6), the pressure control instrument (2), the flow control instrument (4) and the temperature control instrument (6) are respectively connected to a frequency converter (7), the frequency converter (7) is connected to a fan (8), and one end of the pressure transmitter (1), the flow sensor (3) and the temperature sensor (5) are respectively connected to the interior of a device for required interlocking control.

2. A multifunctional interlocking control device for autonomously regulating fan frequency conversion according to claim 1, characterized in that The pressure transmitter (1), flow sensor (3) and temperature sensor (5) sense the change signal and convert it into an electrical signal, which is then transmitted to each control instrument in the form of an electrical signal. Each instrument is closed and the output frequency of the frequency converter (7) is controlled according to the strength of the electrical signal to adjust the speed of the fan (8).

3. A multifunctional interlocking control device for autonomously regulating fan frequency conversion according to claim 1 or 2, characterized in that It can also include temperature sensors, smoke sensors and their control instruments.

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