Air valve control system

Abstract

The utility model discloses an air valve control system which comprises a remote monitoring terminal, a 4-20 mA current signal conversion circuit, a motor position detection module, a motor forward and reverse rotation driving circuit, a motor position signal feedback circuit, a driving motor and a control module. The 4-20mA current signal conversion circuit is connected with the remote monitoring terminal, the 4-20mA current signal conversion circuit is connected with the control module, the motor positive and negative rotation driving circuit is connected with the control module, the motor positive and negative rotation driving circuit is connected with the driving motor, the motor position signal feedback circuit is connected with the control module, and the motor position signal feedback circuit is connected with the control module. And the motor position signal feedback circuit is connected with the remote monitoring terminal. According to the application, the opening degree of the air door can be remotely controlled in real time through the remote monitoring terminal, the opening degree of the air door is detected in real time through the motor position detection module, 4-20mA analog current is output as a motor position feedback signal, and real-time dynamic monitoring of the opening degree of the air door is realized.

Description

Technical Field

[0001] The present application belongs to the technical field of rail transportation equipment, and in particular relates to a damper control system. Background Art

[0002] In a closed building environment, poor ventilation will not only affect human comfort, but also cause a series of hazards such as hypoxia, suffocation, toxic gas hazards, and viral cross-infection. Therefore, good ventilation is particularly important in a closed environment.

[0003] Ventilation systems are generally divided into natural ventilation and mechanical ventilation. However, natural ventilation is impossible in the confined underground environment, so mechanical ventilation is the only option. Mechanical ventilation typically uses fans for both exhaust and supply. To ensure a comfortable, fresh air supply within the station under varying environmental conditions, the supply or exhaust air volume must be adjusted. This air volume adjustment is accomplished by adjusting the damper opening of the damper.

[0004] The damper control system in the ventilation system not only needs to be able to adjust the size of the damper opening, but also needs to know the actual opening size in real time. Therefore, the damper control system must have a feedback signal to let the staff know the actual situation of the damper.

[0005] At present, the existing damper control systems on the market usually have single functions. Some can only control the damper opening size manually, some can be remotely controlled by external switch signals or analog signals, but there is no feedback signal, and the safe and reliable operation of the damper cannot be guaranteed. Others can be controlled by switch signals or analog signals and have feedback signals, but the feedback signals are non-4-20mA analog quantities and cannot meet the use requirements of conventional industrial monitoring systems. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of this application is to provide a damper control system to achieve remote real-time control and monitoring of the damper opening of the damper.

[0007] In order to achieve the above objectives, this application provides the following solutions:

[0008] The present application provides a damper control system, including a remote monitoring terminal, a 4-20mA current signal conversion circuit, a motor position detection module, a motor forward and reverse drive circuit, a motor position signal feedback circuit, a drive motor, and a control module.

[0009] The motor position detection module is connected to the first signal input terminal of the control module,

[0010] The signal input end of the 4-20mA current signal conversion circuit is connected to the control signal output end of the remote monitoring terminal, and the signal output end of the 4-20mA current signal conversion circuit is connected to the second signal input end of the control module.

[0011] The signal input end of the motor forward and reverse driving circuit is connected to the first signal output end of the control module, and the signal output end of the motor forward and reverse driving circuit is connected to the signal input end of the driving motor.

[0012] The signal input end of the motor position signal feedback circuit is connected to the second signal output end of the control module, and the signal output end of the motor position signal feedback circuit is connected to the feedback signal input end of the remote monitoring terminal.

[0013] Preferably, the air valve control system further includes an air valve switch position detection module, and the air valve switch position detection module is connected to the control module.

[0014] Preferably, the air valve switch in position detection module includes a cam, a first travel switch and a second travel switch, the cam is fixedly connected to the output shaft of the drive motor, the signal output end of the first travel switch is connected to the third signal input end of the control module, and the signal output end of the second travel switch is connected to the fourth signal input end of the control module.

[0015] Preferably, the air valve control system also includes an in-position signal processing circuit, the two signal input ends of the in-position signal processing circuit are respectively connected to the signal output end of the first travel switch and the signal output end of the second travel switch, and the two signal output ends of the in-position signal processing circuit are respectively connected to the third signal input end and the fourth signal input end of the control module.

[0016] Preferably, the motor position detection module adopts a potentiometer, and the potentiometer and the drive motor drive the motor.

[0017] Preferably, the air valve control system further comprises a voltage follower circuit, a signal input end of the voltage follower circuit is connected to the motor position detection module, and a signal output end of the voltage follower circuit is connected to the first signal input end of the control module.

[0018] Preferably, the 4-20mA current signal conversion circuit adopts a differential proportional amplifier circuit.

[0019] Preferably, the motor position signal feedback circuit includes a filtering unit and a voltage-to-current unit, the signal input end of the filtering unit is connected to the signal input end of the voltage-to-current unit, and the signal output end of the voltage-to-current unit is connected to the feedback signal input end of the remote monitoring terminal.

[0020] Preferably, the motor forward and reverse drive circuit includes a signal amplification unit, an optocoupler isolation unit and a bidirectional thyristor drive unit connected in sequence, the signal input end of the signal amplification unit is connected to the first signal output end of the control module, and the signal output end of the bidirectional thyristor drive unit is connected to the signal input end of the drive motor.

[0021] Preferably, the air valve control system further includes a human-computer interaction module, and the human-computer interaction module is connected to the control module.

[0022] Due to the adoption of the above technical solution, this application has the following beneficial effects:

[0023] This application can output a 4-20mA current signal through the remote monitoring terminal to remotely control the damper opening of the damper in real time. It can also detect the damper opening in real time through the motor position detection module, and output a 4-20mA analog current as the motor position feedback signal to achieve real-time dynamic monitoring of the damper opening, ensuring the safe and reliable operation of the damper and better meeting the use requirements of conventional industrial monitoring systems.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the various elements or parts are not necessarily drawn according to the actual scale. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort.

[0026] Figure 1 This is a principle block diagram of a damper control system in one embodiment of the present application;

[0027] Figure 2 This is a circuit diagram of a damper control system in one embodiment of the present application. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined.

[0030] In this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0031] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] like Figure 1-2 As shown, the embodiment of the present application provides a damper control system, which includes a remote monitoring terminal 1, a 4-20mA current signal conversion circuit 2, a motor position detection module 3, a motor forward and reverse drive circuit 4, a motor position signal feedback circuit 5, a drive motor 6 and a control module 7.

[0033] The motor position detection module 3 is connected to the first signal input terminal of the control module 7, the signal input terminal of the 4-20mA current signal conversion circuit 2 is connected to the control signal output terminal of the remote monitoring terminal 1, and the signal output terminal of the 4-20mA current signal conversion circuit 2 is connected to the second signal input terminal of the control module 7.

[0034] The signal input end of the motor forward and reverse drive circuit 4 is connected to the first signal output end of the control module 7, and the signal output end of the motor forward and reverse drive circuit 4 is connected to the signal input end of the drive motor 6.

[0035] The signal input end of the motor position signal feedback circuit 5 is connected to the second signal output end of the control module 7 , and the signal output end of the motor position signal feedback circuit 5 is connected to the feedback signal input end of the remote monitoring terminal 1 .

[0036] The working principle of the air valve control system in this embodiment is as follows:

[0037] When in use, the user inputs the control command of opening and closing the air valve on the remote monitoring terminal 1, and the remote control terminal converts the control command into a 4-20mA current signal and outputs it to the 4-20mA current signal conversion circuit 2. The 4-20mA current signal conversion circuit 2 converts the 4-20mA current signal into a corresponding voltage signal and inputs it to the control module 7. The control module 7 controls the motor forward and reverse drive circuit 4 to work according to the corresponding motor control signal output according to the voltage signal, thereby driving the drive motor 6 to open or close the air valve of the air valve through the motor forward and reverse drive circuit 4. During the process of opening and closing the damper, the motor position detection module 3 detects the position signal of the drive motor 6 in real time and transmits it to the control module 7 (the position signal corresponds to the damper opening of the damper). The control module 7 outputs a corresponding PWM signal to the motor position signal feedback circuit 5 according to the position signal. The motor position signal feedback circuit 5 converts the PWM signal into a voltage-converted 4-20mA current feedback signal and feeds it back to the remote control terminal so that the remote control terminal can display the corresponding damper opening size according to the 4-20mA current feedback signal, thereby realizing remote real-time monitoring of the damper opening of the damper.

[0038] The damper control system of this embodiment is equipped with a remote monitoring terminal 1, a 4-20mA current signal conversion circuit 2, a motor position detection module 3, a motor forward and reverse drive circuit 4, a motor position signal feedback circuit 5, a drive motor 6 and a control module 7. It can output a 4-20mA current signal through the remote monitoring terminal 1 to remotely control the damper opening of the damper in real time. It can also detect the damper opening in real time through the motor position detection module 3, and output a 4-20mA analog current as a motor position feedback signal to achieve real-time dynamic monitoring of the damper opening, thereby ensuring the safe and reliable operation of the damper and better meeting the use requirements of conventional industrial monitoring systems.

[0039] Specifically, if Figure 2 As shown, in this embodiment, the control module 7 adopts a single chip microcomputer of type PIC18F46K22 (ie Figure 2 U3); the driving motor 6 adopts a claw-pole permanent magnet synchronous motor.

[0040] In one embodiment, the damper control system further includes a damper opening / closing position detection module 8, which is connected to the control module 7. In this embodiment, the damper opening / closing position detection module 8 detects whether the damper is fully opened or fully closed, and when it detects that the damper is fully opened or fully closed, it outputs a corresponding position signal to the control module 7. The control module 7 then outputs the position signal to the remote monitoring terminal 1 for the user to view.

[0041] In one embodiment, the damper opening / closing position detection module 8 includes a cam (not shown), a first travel switch 801, and a second travel switch 802. The cam is fixedly connected to the output shaft of the drive motor 6. The signal output end of the first travel switch 801 is connected to the third signal input end of the control module 7, and the signal output end of the second travel switch 802 is connected to the fourth signal input end of the control module 7. In this embodiment, when the drive motor 6 rotates, it drives the damper of the damper to rotate, and at the same time drives the cam to rotate. When the damper of the damper is opened to the maximum opening or closed to the full position, the cam will contact the first travel switch 801 or the second travel switch 802, and the first travel switch 801 or the second travel switch 802 will be turned on to output the corresponding position signal to the control module 7, thereby realizing the monitoring of the upper limit signal of the damper opening and closing.

[0042] In one embodiment, the damper control system further includes an in-position signal processing circuit 9. The two signal input terminals of the in-position signal processing circuit 9 are respectively connected to the signal output terminals of the first travel switch 801 and the second travel switch 802. The two signal output terminals of the in-position signal processing circuit 9 are respectively connected to the third signal input terminal and the fourth signal input terminal of the control module 7. In this embodiment, the in-position signal processing circuit 9 processes the door open in-position signal and the door close in-position signal outputted by the first travel switch 801 and the second travel switch 802, thereby improving the stability of the signals.

[0043] Specifically, if Figure 2 As shown, in this embodiment, the processing chip of the in-position signal processing circuit 9 adopts a 74LS132 chip (i.e. Figure 2 In the figure, U2 is a chip having four groups of 2-input NAND gates with Schmitt triggers. The first limit switch 801 and the second limit switch 802 are connected to U2 via the connector P9.

[0044] In one embodiment, the motor position detection module 3 uses a potentiometer, which works with the drive motor 6 to drive the motor 6. When the drive motor 6 rotates, it drives the potentiometer to rotate, thereby changing the circuit in the circuit connected to the potentiometer. The resistance in the circuit connected to the potentiometer and the opening of the damper both correspond to the rotation angle of the motor. Therefore, by detecting the resistance in the circuit connected to the potentiometer, the rotation angle of the drive motor 6 is detected, thereby realizing the detection of the position of the drive motor 6 and, in turn, the detection of the damper opening. The circuit structure is simple, and the detection results are accurate and reliable.

[0045] Building on the previous embodiment, in one embodiment, the damper control system further includes a voltage follower circuit 10. The signal input of the voltage follower circuit 10 is connected to the motor position detection module 3, and the signal output of the voltage follower circuit 10 is connected to the first signal input of the control module 7. During the damper opening and closing process, the rotation of the drive motor 6 causes the resistance of the motor position detection module 3 (potentiometer) to change, thereby causing the voltage at the signal input of the voltage follower circuit 10 to change. The voltage follower circuit 10 processes the detected motor position signal so that the change in the output voltage of the voltage follower circuit 10 is the same as the change in the input voltage of the voltage follower circuit 10 caused by the change in the resistance of the motor position detection module 3. The output voltage of the voltage follower circuit 10 remains the same as the input voltage, without amplification. However, the voltage follower circuit 10 has the characteristics of high input impedance and low output impedance, and the circuit is simple.

[0046] Specifically, if Figure 2 As shown, in this embodiment, the voltage follower circuit 10 is connected to the motor position detection module 3 through the connector P3, and the voltage follower of the voltage follower circuit 10 adopts an LM324 operational amplifier (ie Figure 2 U1A).

[0047] In one embodiment, the 4-20mA current signal conversion circuit 2 adopts a differential proportional amplifier circuit. In this embodiment, the 4-20mA current signal conversion circuit 2 adopts a differential proportional amplifier circuit to convert and amplify the 4-20mA current signal output by the remote monitoring terminal 1. Specifically, the main amplifying component in the differential proportional amplifier circuit adopts an operational amplifier of model LM324 (i.e. Figure 2 (U1D).

[0048] In one embodiment, the motor position signal feedback circuit 5 includes a filter unit 501 and a voltage-to-current conversion unit 502. The signal input terminal of the filter unit 501 is connected to the signal input terminal of the voltage-to-current conversion unit 502, and the signal output terminal of the voltage-to-current conversion unit 502 is connected to the feedback signal input terminal of the remote monitoring terminal 1. The filter unit 501 filters the PWM signal output by the control module 7. The voltage-to-current conversion unit 502 then performs voltage-to-current conversion on the filtered PWM signal to obtain a 4-20mA current feedback signal and feeds it back to the remote control terminal, thereby meeting the use requirements of conventional industrial monitoring systems in the remote monitoring terminal 1.

[0049] Specifically, if Figure 2 As shown, the filter unit 501 is composed of R21, R22, R23, C12, C12, and C14 to form a third-order RC filter device, which filters the PWM signal through a third-order low-pass filter. The main components of the voltage-to-current unit 502 use two LM324 operational amplifiers (i.e. Figure 2 U1B and U1C in the figure), the converted current signal passes through two transistors (i.e. Figure 2 Q2, Q3) are amplified and transmitted to the remote monitoring terminal 1.

[0050] In this embodiment, a single chip microcomputer outputs a PWM signal and an operational amplifier mode is used to generate a 4-20mA continuously adjustable current analog signal, thereby reducing dependence on a dedicated current IC and lowering costs.

[0051] In one embodiment, the motor forward and reverse drive circuit 4 includes a signal amplification unit 401, an optocoupler isolation unit 402, and a bidirectional thyristor drive unit 403, which are connected in sequence. The signal input end of the signal amplification unit 401 is connected to the first signal output end of the control module 7, and the signal output end of the bidirectional thyristor drive unit 403 is connected to the signal input end of the drive motor 6. The signal amplification unit 401 amplifies the motor control signal of the control module 7 and outputs it to the optocoupler isolation unit 402. The optocoupler isolation unit 402 implements signal isolation between the control module 7 and the drive motor 6, improving circuit reliability and ensuring operator safety. The bidirectional thyristor drive unit 403 controls the forward and reverse rotation of the drive motor 6 according to the motor control signal output by the optocoupler isolation unit 402.

[0052] Specifically, in this embodiment, Figure 2 As shown, the main components of the signal amplification unit 401 are transistors, Q6 and Q8 respectively amplify the electrode forward control signal and the motor reverse control signal in the motor control signal; the optical coupler isolation unit 402 uses three MOC3061 optical coupler isolators (i.e. Figure 2 U4, U5, U6 in the bidirectional thyristor drive unit 403 uses three bidirectional thyristor devices (i.e. Figure 2 The bidirectional thyristor drive unit 403 is connected to the control module 7 through the connector P5.

[0053] In one embodiment, the damper control system further includes a human-machine interaction module 11, which is connected to the control module 7. In this embodiment, the human-machine interaction module 11 includes a button 111 and an LCD display 112, which are connected via a connector (Header 8X2) Figure 2 P4 in the middle is connected to the control module 7, and parameters can be set, motor position and corresponding current can be calibrated, and real-time data can be monitored through buttons 111 and LCD display 112.

[0054] Specifically, in one embodiment, the air valve control system further includes a switch 12, and the signal output end of the switch 12 is connected to the control module 7. Figure 2 As shown, the switch 12 adopts a dial switch of model SW-4 (i.e. Figure 2 In S1), the switching switch 12 is used to switch the control mode of the system, wherein the control mode of the system includes a manual control mode and an automatic control module 7. In the manual control mode, the user can control the damper opening of the damper through the button 111 and the display screen of the human-computer interaction module 11. In the automatic control mode, the damper opening of the damper is controlled through the remote monitoring terminal 1.

[0055] Specifically, in this embodiment, the remote monitoring terminal 1 is an industrial computer or a PC.

[0056] Those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of this application and to form different embodiments. In some instances, well-known methods, structures, and techniques are not shown in detail in order not to obscure the understanding of this specification.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and description of the present application.

Claims

1. A damper control system, characterized in that: It includes remote monitoring terminal, 4-20mA current signal conversion circuit, motor position detection module, motor forward and reverse drive circuit, motor position signal feedback circuit, drive motor and control module. The motor position detection module is connected to the first signal input terminal of the control module, The signal input end of the 4-20mA current signal conversion circuit is connected to the control signal output end of the remote monitoring terminal, and the signal output end of the 4-20mA current signal conversion circuit is connected to the second signal input end of the control module. The signal input end of the motor forward and reverse driving circuit is connected to the first signal output end of the control module, and the signal output end of the motor forward and reverse driving circuit is connected to the signal input end of the driving motor. The signal input end of the motor position signal feedback circuit is connected to the second signal output end of the control module, and the signal output end of the motor position signal feedback circuit is connected to the feedback signal input end of the remote monitoring terminal.

2. The air valve control system according to claim 1, characterized in that: It also includes an air valve switch in place detection module, and the air valve switch in place detection module is connected to the control module.

3. The air valve control system according to claim 2, characterized in that: The air valve switch in position detection module includes a cam, a first travel switch and a second travel switch. The cam is fixedly connected to the output shaft of the drive motor. The signal output end of the first travel switch is connected to the third signal input end of the control module, and the signal output end of the second travel switch is connected to the fourth signal input end of the control module.

4. The air valve control system according to claim 3, characterized in that: It also includes an in-position signal processing circuit, the two signal input ends of the in-position signal processing circuit are respectively connected to the signal output end of the first travel switch and the signal output end of the second travel switch, and the two signal output ends of the in-position signal processing circuit are respectively connected to the third signal input end and the fourth signal input end of the control module.

5. The air valve control system according to claim 1, characterized in that: The motor position detection module adopts a potentiometer, and the potentiometer and the drive motor drive the motor.

6. The air valve control system according to claim 5, characterized in that: It also includes a voltage follower circuit, wherein the signal input end of the voltage follower circuit is connected to the motor position detection module, and the signal output end of the voltage follower circuit is connected to the first signal input end of the control module.

7. The air valve control system according to claim 1, characterized in that: The 4-20mA current signal conversion circuit adopts a differential proportional amplifier circuit.

8. The air valve control system according to claim 1, characterized in that: The motor position signal feedback circuit includes a filtering unit and a voltage-to-current unit, the signal input end of the filtering unit is connected to the signal input end of the voltage-to-current unit, and the signal output end of the voltage-to-current unit is connected to the feedback signal input end of the remote monitoring terminal.

9. The air valve control system according to claim 1, characterized in that: The motor forward and reverse drive circuit includes a signal amplification unit, an optocoupler isolation unit and a bidirectional thyristor drive unit connected in sequence, the signal input end of the signal amplification unit is connected to the first signal output end of the control module, and the signal output end of the bidirectional thyristor drive unit is connected to the signal input end of the drive motor.

10. The air valve control system according to any one of claims 1 to 9, characterized in that: It also includes a human-computer interaction module, which is connected to the control module.

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