Air volume adjusting device of fresh air handling unit

Abstract

The utility model discloses an air volume adjusting device of a fresh air handling unit, belongs to the technical field of fresh air handling units, and solves the problems that a terminal of an air volume adjusting valve of the fresh air handling unit is loosened due to vibration of a power line or a signal line, intermittent interruption of voltage is caused, and the adjusting valve suddenly stops or malfunctions occur. The case is provided with an air inlet and an air outlet, the fan is arranged in the case and guides air to flow from the air inlet to the air outlet, the adjusting valve is communicated with the air outlet and can adjust the air volume, and the adjusting valve is coupled with an anti-vibration redundant power circuit. The anti-vibration redundant power supply circuit switches a standby power supply when a main power supply of the regulating valve is interrupted and inhibits signal line contact noise caused by vibration to prevent false triggering. Power supply redundancy, energy storage buffering and rapid switching are achieved through pure hardware design, a controller is not needed, and it is guaranteed that the power supply of the air volume adjusting valve is continuous and stable in the vibration environment.

Description

Technical Field

[0001] This utility model relates to the field of fresh air handling unit technology, and in particular to a fresh air handling unit air volume regulating device. Background Technology

[0002] The airflow regulating device in a fresh air handling unit is essentially an airflow regulating valve, a key component for controlling airflow in a fresh air system. It is typically installed in the air duct of the fresh air handling unit, changing the airflow area by adjusting the valve's opening and closing degree, thereby achieving precise control of the airflow. An airflow regulating valve generally consists of a valve body, valve core, drive unit, and control circuit. The valve body is the main structure of the regulating valve, usually made of metal, possessing good strength and corrosion resistance; the valve core is the core component for regulating airflow, and its shape and material affect the accuracy and stability of the regulation. The drive unit is generally electric, used to drive the movement of the valve core. The control circuit is responsible for receiving external control signals, such as instructions from the fresh air handling unit controller, to achieve automatic adjustment. The airflow regulating valve plays a vital role in the fresh air system, not only adjusting the fresh air volume according to indoor air quality requirements but also optimizing fan power and improving system operating efficiency in energy-saving operation modes. Its performance directly affects the comfort and energy-saving effect of the fresh air system; therefore, selecting a high-quality airflow regulating valve is crucial for the stable operation of the fresh air system.

[0003] However, the air volume regulating valve of the fresh air unit may suddenly stop or malfunction because the terminals of the power cord or signal line become loose due to vibration.

[0004] Therefore, a fresh air handling unit air volume regulation device is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a new air volume regulating device for air handling units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A fresh air handling unit's air volume regulating device includes a chassis with an air inlet and an air outlet, a fan installed inside the chassis and guiding air flow from the air inlet to the air outlet, and a regulating valve connected to the air outlet and capable of regulating air volume. The regulating valve is coupled to a vibration-resistant redundant power supply circuit. The vibration-resistant redundant power supply circuit switches to a backup power supply when the main power supply to the regulating valve is interrupted and suppresses signal line contact noise caused by vibration to prevent false triggering.

[0008] Preferably, the vibration-resistant redundant power supply circuit includes a main power input and filtering module, a main voltage regulator module, a supercapacitor energy storage and charging module, a voltage monitoring and switching module, and an output redundancy and protection module.

[0009] The AC input terminal of the main power input and filtering module is used to connect to AC power, and its DC output terminal is electrically connected to the input terminal of the main voltage regulator module.

[0010] The output terminal of the main voltage regulator module is connected to the charging terminal of the supercapacitor energy storage and charging module, and the first input terminal of the output redundancy and protection module, respectively.

[0011] The output terminal of the supercapacitor energy storage and charging module is connected to the second input terminal of the output redundancy and protection module through the voltage monitoring and switching module.

[0012] The output terminal of the output redundancy and protection module is connected to the power interface of the regulating valve.

[0013] The voltage monitoring and switching module detects the output voltage of the main voltage regulator module in real time. When the voltage is lower than the set threshold, it controls the supercapacitor energy storage and charging module to supply power to the output redundancy and protection module.

[0014] Preferably, the main power input and filtering module includes a power frequency transformer, a common mode inductor, a rectifier bridge GBJ2510, an electrolytic capacitor, and a ceramic capacitor. The first and second pins of the primary winding of the power frequency transformer are connected to the AC 220V live wire and neutral wire, respectively. The third and tenth pins of the secondary winding of the power frequency transformer are connected to the two input pins of the common mode inductor. The two output pins of the common mode inductor are connected to the two AC input pins of the rectifier bridge GBJ2510. The DC positive pin of the rectifier bridge GBJ2510 is connected to the positive terminal of the electrolytic capacitor and one end of the ceramic capacitor. The DC negative pin of the rectifier bridge GBJ2510 is grounded. The negative terminal of the electrolytic capacitor and the other end of the ceramic capacitor are grounded.

[0015] Preferably, the main voltage regulator module includes a switching regulator LM2596-ADJ, a freewheeling diode SS34, an energy storage inductor, a feedback resistor, and a filter capacitor. The Vin pin of the switching regulator LM2596-ADJ is connected to the DC positive pin of the rectifier bridge GBJ2510, the GND pin of the switching regulator LM2596-ADJ is grounded, and the FB pin of the switching regulator LM2596-ADJ is connected to its Vout pin through the feedback resistor. DJ is grounded through a feedback resistor. The anode of the freewheeling diode SS34 is connected to the SW pin of the switching regulator LM2596-ADJ, and the cathode of the freewheeling diode SS34 is connected to the Vout pin of the switching regulator LM2596-ADJ. One end of the energy storage inductor is connected to the SW pin, and the other end is connected to the Vout pin of the switching regulator LM2596-ADJ. The positive terminal of the filter capacitor is connected to the Vout pin of the switching regulator LM2596-ADJ, and the negative terminal of the filter capacitor is grounded.

[0016] Preferably, the supercapacitor energy storage and charging module includes a supercapacitor, a current-limiting resistor, a balancing resistor, and a charging diode SS34. The positive terminal of the supercapacitor is connected to the Vout pin of the switching regulator LM2596-ADJ through the current-limiting resistor, the negative terminal of the supercapacitor is grounded, the balancing resistor is connected in parallel across the supercapacitor, the anode of the charging diode SS34 is connected to the Vout pin of the switching regulator LM2596-ADJ, and the cathode of the charging diode SS34 is connected to the positive terminal of the supercapacitor.

[0017] Preferably, the voltage monitoring and switching module includes an adjustable Zener diode TL431, a voltage divider resistor, and a MOSFET. The reference pin of the adjustable Zener diode TL431 is connected to the common node of the voltage divider resistor. The other end of the voltage divider resistor is connected to the Vout pin of the switching regulator LM2596-ADJ. The other end of the voltage divider resistor is grounded. The cathode pin of the adjustable Zener diode TL431 is connected to the gate of the MOSFET. The anode pin of the adjustable Zener diode TL431 is grounded. The source of the MOSFET is connected to the positive terminal of the supercapacitor. The drain of the MOSFET is connected to the second input terminal of the output redundancy and protection module.

[0018] Preferably, the output redundancy and protection module includes a diode or gate circuit and a resettable fuse MF-R050. The diode or gate circuit includes two Schottky diodes SS34. The anode of one Schottky diode SS34 is connected to the main power supply, and the anode of the other Schottky diode SS34 is connected to the output terminal of the supercapacitor. The cathodes of the two Schottky diodes SS34 are connected in parallel to the power supply terminal of the regulating valve. The resettable fuse MF-R050 is connected in series between the diode or gate circuit and the power supply terminal of the regulating valve.

[0019] This utility model has the following beneficial effects:

[0020] This invention achieves power redundancy, energy storage buffering, and rapid switching through pure hardware design, eliminating the need for a controller and ensuring continuous and stable power supply to the airflow regulating valve under vibration conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a structural block diagram of the anti-vibration redundant power supply circuit in this utility model.

[0024] 1. Chassis; 2. Fan; 3. Regulating valve; 4. Main power input and filtering module; 5. Main voltage regulator module; 6. Supercapacitor energy storage and charging module; 7. Voltage monitoring and switching module; 8. Output redundancy and protection module. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] A fresh air handling unit's air volume regulating device, such as Figure 1 As shown, the device includes a chassis 1 with an air inlet and an air outlet, a fan 2 installed inside the chassis 1 and guiding air flow from the air inlet to the air outlet, and a regulating valve 3 connected to the air outlet and capable of adjusting the air volume. The regulating valve 3 is coupled to an anti-vibration redundant power supply circuit. When the main power supply of the regulating valve 3 is interrupted, the anti-vibration redundant power supply circuit switches to a backup power supply and suppresses signal line contact noise caused by vibration to prevent false triggering.

[0032] like Figure 2As shown, the vibration-resistant redundant power supply circuit includes a main power input and filtering module 4, a main voltage regulator module 5, a supercapacitor energy storage and charging module 6, a voltage monitoring and switching module 7, and an output redundancy and protection module 8. The AC input terminal of the main power input and filtering module 4 is used to connect to AC power, and its DC output terminal is electrically connected to the input terminal of the main voltage regulator module 5. The output terminal of the main voltage regulator module 5 is connected to the charging terminal of the supercapacitor energy storage and charging module 6 and the first input terminal of the output redundancy and protection module 8. The output terminal of the supercapacitor energy storage and charging module 6 is connected to the second input terminal of the output redundancy and protection module 8 through the voltage monitoring and switching module 7. The output terminal of the output redundancy and protection module 8 is connected to the power interface of the regulating valve 3. The voltage monitoring and switching module 7 detects the output voltage of the main voltage regulator module 5 in real time. When the voltage is lower than the set threshold, it controls the supercapacitor energy storage and charging module 6 to supply power to the output redundancy and protection module 8.

[0033] The main power input and filtering module 4 includes a power frequency transformer, a common mode inductor, a rectifier bridge GBJ2510, an electrolytic capacitor, and a ceramic capacitor. The first and second pins of the primary winding of the power frequency transformer are connected to the AC 220V live wire and neutral wire, respectively. The third and tenth pins of the secondary winding of the power frequency transformer are connected to the two input pins of the common mode inductor. The two output pins of the common mode inductor are connected to the two AC input pins of the rectifier bridge GBJ2510. The DC positive pin of the rectifier bridge GBJ2510 is connected to the positive terminal of the electrolytic capacitor and one end of the ceramic capacitor. The DC negative pin of the rectifier bridge GBJ2510 is grounded, and the negative terminal of the electrolytic capacitor and the other end of the ceramic capacitor are grounded.

[0034] The main voltage regulator module 5 includes a switching regulator LM2596-ADJ, a freewheeling diode SS34, an energy storage inductor, a feedback resistor, and a filter capacitor. The Vin pin of the switching regulator LM2596-ADJ is connected to the positive DC pin of the rectifier bridge GBJ2510. The GND pin of the switching regulator LM2596-ADJ is grounded. The FB pin of the switching regulator LM2596-ADJ is connected to its Vout pin through the feedback resistor, and the switching regulator LM2596-ADJ is also grounded through the feedback resistor. The anode of the freewheeling diode SS34 is connected to the SW pin of the switching regulator LM2596-ADJ, and the cathode of the freewheeling diode SS34 is connected to the Vout pin of the switching regulator LM2596-ADJ. One end of the energy storage inductor is connected to the SW pin, and the other end is connected to the Vout pin of the switching regulator LM2596-ADJ. The positive terminal of the filter capacitor is connected to the Vout pin of the switching regulator LM2596-ADJ, and the negative terminal of the filter capacitor is grounded.

[0035] The supercapacitor energy storage and charging module 6 includes a supercapacitor, a current-limiting resistor, a balancing resistor, and a charging diode SS34. The positive terminal of the supercapacitor is connected to the Vout pin of the switching regulator LM2596-ADJ through the current-limiting resistor, the negative terminal of the supercapacitor is grounded, the balancing resistor is connected in parallel across the supercapacitor, the anode of the charging diode is connected to the Vout pin of the switching regulator LM2596-ADJ, and the cathode of the charging diode is connected to the positive terminal of the supercapacitor.

[0036] The voltage monitoring and switching module 7 includes an adjustable Zener diode TL431, a voltage divider resistor, and a MOSFET. The reference pin of the adjustable Zener diode TL431 is connected to the common node of the voltage divider resistor. The other end of the voltage divider resistor is connected to the Vout pin of the switching regulator LM2596-ADJ. The other end of the voltage divider resistor is grounded. The cathode pin of the adjustable Zener diode TL431 is connected to the gate G of the MOSFET. The anode pin of the adjustable Zener diode TL431 is grounded. The source S of the MOSFET is connected to the positive terminal of the supercapacitor. The drain of the MOSFET is connected to the second input terminal of the output redundancy and protection module 8.

[0037] The output redundancy and protection module 8 includes a diode OR gate circuit and a resettable fuse MF-R050. The diode OR gate circuit includes two Schottky diodes SS34. The anode of one Schottky diode SS34 is connected to the main power supply, and the anode of the other Schottky diode SS34 is connected to the output terminal of the supercapacitor. The cathodes of the two Schottky diodes SS34 are connected in parallel to the power supply terminal of the regulating valve 3. The resettable fuse MF-R050 is connected in series between the diode OR gate circuit and the power supply terminal of the regulating valve 3.

[0038] This invention utilizes a vibration-resistant redundant power supply circuit and a multi-stage coordinated control valve 3 to provide continuous and stable power in a vibration environment. Its working principle is as follows:

[0039] The 220V AC input is stepped down to 30V by a power frequency transformer, then sequentially passes through a common-mode inductor to suppress common-mode noise, a rectifier bridge GBJ2510 to convert it to pulsating DC, and a composite filter network consisting of a 470μF electrolytic capacitor and a 0.1μF ceramic capacitor to filter out high and low frequency interference. The purified DC input is then fed into a switching regulator LM2596-ADJ, which stabilizes the voltage to 24V through internal PWM control and an external 68μH energy storage inductor. Simultaneously, the voltage is charged to a series supercapacitor via a 1Ω current-limiting resistor and a charging diode SS34 to store energy. When the main power supply is normal... The 24V output directly powers the load via an OR gate diode circuit, while the adjustable Zener diode TL431 monitors the output voltage in real time through a voltage divider resistor network. When vibration causes poor contact of the main power supply and the voltage drops below the 22V threshold, the cathode of the adjustable Zener diode TL431 conducts and drives the gate of the MOSFET, causing the supercapacitor bank to discharge to the load through the diode OR gate circuit. The switching process is short and the output voltage fluctuation is small. The dual power supply achieves physical isolation through the diode OR gate circuit to avoid reverse current interference. At the same time, a self-resetting fuse is connected in series at the output terminal to form dual protection against overcurrent and overvoltage.

[0040] Through supercapacitor energy storage and hardware-level rapid switching, it can maintain continuous power supply after the main power supply is interrupted, completely covering the instantaneous power outage caused by vibration. At the same time, it adopts multiple EMI suppressions of common mode inductor, capacitor and two-stage filtering to effectively avoid the malfunction of regulating valve 3 due to power supply noise.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fresh air handling unit's air volume regulating device, characterized in that, It includes a chassis (1) with an air inlet and an air outlet, a fan (2) installed in the chassis (1) and guiding air to flow from the air inlet to the air outlet, and a regulating valve (3) connected to the air outlet and capable of adjusting the air volume. The regulating valve (3) is coupled to a vibration-resistant redundant power supply circuit. When the main power supply of the regulating valve (3) is interrupted, the vibration-resistant redundant power supply circuit switches to a backup power supply and suppresses signal line contact noise caused by vibration to prevent false triggering.

2. The air volume regulating device for a fresh air handling unit according to claim 1, characterized in that, The vibration-resistant redundant power supply circuit includes a main power input and filtering module (4), a main voltage regulator module (5), a supercapacitor energy storage and charging module (6), a voltage monitoring and switching module (7), and an output redundancy and protection module (8). The AC input terminal of the main power input and filtering module (4) is used to connect to AC power, and its DC output terminal is electrically connected to the input terminal of the main voltage regulator module (5). The output terminal of the main voltage regulator module (5) is connected to the charging terminal of the supercapacitor energy storage and charging module (6) and the first input terminal of the output redundancy and protection module (8); The output terminal of the supercapacitor energy storage and charging module (6) is connected to the second input terminal of the output redundancy and protection module (8) through the voltage monitoring and switching module (7); The output terminal of the output redundancy and protection module (8) is connected to the power interface of the regulating valve (3); The voltage monitoring and switching module (7) detects the output voltage of the main voltage regulator module (5) in real time. When the voltage is lower than the set threshold, it controls the supercapacitor energy storage and charging module (6) to supply power to the output redundancy and protection module (8).

3. The air volume regulating device for a fresh air handling unit according to claim 2, characterized in that, The main power input and filtering module (4) includes a power frequency transformer, a common mode inductor, a rectifier bridge GBJ2510, an electrolytic capacitor, and a ceramic capacitor. The first and second pins of the primary winding of the power frequency transformer are connected to the AC 220V live wire and the neutral wire, respectively. The third and tenth pins of the secondary winding of the power frequency transformer are connected to the two input pins of the common mode inductor. The two output pins of the common mode inductor are connected to the two AC input pins of the rectifier bridge GBJ2510. The DC positive pin of the rectifier bridge GBJ2510 is connected to the positive terminal of the electrolytic capacitor and one end of the ceramic capacitor. The DC negative pin of the rectifier bridge GBJ2510 is grounded. The negative terminal of the electrolytic capacitor and the other end of the ceramic capacitor are grounded.

4. The air volume regulating device for a fresh air handling unit according to claim 2, characterized in that, The main voltage regulator module (5) includes a switching regulator LM2596-ADJ, a freewheeling diode SS34, an energy storage inductor, a feedback resistor, and a filter capacitor. The Vin pin of the switching regulator LM2596-ADJ is connected to the DC positive pin of the rectifier bridge GBJ2510. The GND pin of the switching regulator LM2596-ADJ is grounded. The FB pin of the switching regulator LM2596-ADJ is connected to its Vout pin through the feedback resistor. J is grounded through a feedback resistor. The anode of the freewheeling diode SS34 is connected to the SW pin of the switching regulator LM2596-ADJ, and the cathode of the freewheeling diode SS34 is connected to the Vout pin of the switching regulator LM2596-ADJ. One end of the energy storage inductor is connected to the SW pin, and the other end is connected to the Vout pin of the switching regulator LM2596-ADJ. The positive terminal of the filter capacitor is connected to the Vout pin of the switching regulator LM2596-ADJ, and the negative terminal of the filter capacitor is grounded.

5. The air volume regulating device for a fresh air handling unit according to claim 2, characterized in that, The supercapacitor energy storage and charging module (6) includes a supercapacitor, a current-limiting resistor, a balancing resistor, and a charging diode SS34. The positive terminal of the supercapacitor is connected to the Vout pin of the switching regulator LM2596-ADJ through the current-limiting resistor. The negative terminal of the supercapacitor is grounded. The balancing resistor is connected in parallel across the two ends of the supercapacitor. The anode of the charging diode SS34 is connected to the Vout pin of the switching regulator LM2596-ADJ, and the cathode of the charging diode SS34 is connected to the positive terminal of the supercapacitor.

6. The air volume regulating device for a fresh air handling unit according to claim 2, characterized in that, The voltage monitoring and switching module (7) includes an adjustable Zener diode TL431, a voltage divider resistor, and a MOSFET. The reference pin of the adjustable Zener diode TL431 is connected to the common node of the voltage divider resistor. The other end of the voltage divider resistor is connected to the Vout pin of the switching regulator LM2596-ADJ. The other end of the voltage divider resistor is grounded. The cathode pin of the adjustable Zener diode TL431 is connected to the gate of the MOSFET. The anode pin of the adjustable Zener diode TL431 is grounded. The source of the MOSFET is connected to the positive terminal of the supercapacitor. The drain of the MOSFET is connected to the second input terminal of the output redundancy and protection module (8).

7. The air volume regulating device for a fresh air handling unit according to claim 2, characterized in that, The output redundancy and protection module (8) includes a diode or gate circuit and a self-resetting fuse MF-R050. The diode or gate circuit includes two Schottky diodes SS34. The anode of one Schottky diode SS34 is connected to the main power supply, and the anode of the other Schottky diode SS34 is connected to the output terminal of the supercapacitor. The cathodes of the two Schottky diodes SS34 are connected in parallel to the power supply terminal of the regulating valve (3). The self-resetting fuse MF-R050 is connected in series between the diode or gate circuit and the power supply terminal of the regulating valve (3).

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