An exhaust duct air volume control device based on wind pressure detection

Abstract

The utility model relates to the technical field of exhaust duct, provide an exhaust duct air volume control device based on wind pressure detection, include: integrated control board, microprocessor, power module, air valve adjusting module, wind pressure detection module, AD conversion module, DA conversion module, communication module and communication setting module, integrated control board sets up in the exhaust duct, microprocessor fixed mounting is in integrated control board, power module, air valve adjusting module, wind pressure detection module, AD conversion module, DA conversion module, communication module and communication setting module are electrically connected with microprocessor, the utility model discloses rational in structure, convenient to use, can realize the accurate control to the exhaust duct wind pressure, make the wind pressure range of exhaust duct meet the production process requirement.

Description

Technical Field

[0001] This utility model relates to the field of exhaust duct technology, and in particular to an exhaust duct airflow control device based on wind pressure detection. Background Technology

[0002] An exhaust duct airflow control device is an automated device used to regulate the pressure or airflow in an exhaust system. It uses sensors, controllers, and actuators to control the opening and closing of valves, thereby improving system efficiency and accuracy.

[0003] For example, application number CN202410333661.X discloses a temperature control method for a ducted split air conditioner. This method includes: in the current control cycle, obtaining a first temperature difference between a first indoor temperature and a first set temperature in a first room; using the first temperature difference as input, adjusting the first opening degree of a first air valve in the first room according to a control algorithm capable of eliminating deviations, thereby reducing the first temperature difference; and controlling the fan speed of the indoor unit according to the set airflow of a second air valve in a second room, so that the airflow from the second air valve remains at the set airflow even when the opening degree of the first air valve changes.

[0004] However, clean indoor air is crucial for human health and efficient production. If the exhaust duct has too little airflow, the indoor air cleanliness, temperature, humidity, and concentration of harmful gases cannot meet the requirements, leading to a deteriorating environment and harm to people's health. If the exhaust duct has too much airflow, a large amount of outside air enters, causing indoor temperature fluctuations. In order to reach the set temperature, the temperature regulation equipment is forced to operate to achieve the appropriate working temperature, resulting in a large amount of energy waste. In addition, it will increase the burden on the filter components in the exhaust duct, reducing the lifespan of the filter components. Utility Model Content

[0005] To address the aforementioned problems, this invention provides an exhaust duct airflow control device based on wind pressure detection.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An exhaust duct airflow control device based on wind pressure detection includes: an integrated control board, a microprocessor, a power supply module, a damper adjustment module, a wind pressure detection module, an A / D conversion module, a D / A conversion module, a communication module, and a communication setting module. The integrated control board is disposed inside the exhaust duct, and the microprocessor is fixedly mounted on the integrated control board. The power supply module, damper adjustment module, wind pressure detection module, A / D conversion module, D / A conversion module, communication module, and communication setting module are electrically connected to the microprocessor.

[0008] Preferably, the microprocessor, power supply module, air valve adjustment module, air pressure detection module, A / D conversion module, D / A conversion module, communication module, and communication setting module are fixedly connected to the integrated control board by welding.

[0009] Preferably, it further includes: a foldable heat dissipation and protective shell assembly, the foldable heat dissipation and protective shell assembly including: a protective shell, a sliding hinge seat, a light rod, a limiting plate, a heat dissipation plate and a pull plate, the protective shell being detachably connected to the integrated control board by screws, two sets of light rods being provided, the lower ends of the two sets of light rods being fixedly connected to the integrated control board, the sliding hinge seat being slidably disposed on the light rod, the protective shell being hinged to the sliding hinge seat through a hinge shaft, the limiting plate being fixedly installed on the light rod, the heat dissipation plate being disposed on the upper side of the protective shell, and the pull plate being disposed on the outer side of the protective shell.

[0010] Preferably, the power supply module includes: a 24V DC regulated power supply, a relay, a 5V voltage conversion module, and a 12V voltage conversion module.

[0011] Preferably, the wind pressure detection module includes a pressure sensor and a pitot tube. The pressure sensor includes a static pressure contact and a total pressure contact. The static pressure contact is provided with a static pressure hole, and the total pressure contact is provided with a total pressure hole. Two sets of pitot tubes are provided, and the two sets of pitot tubes are respectively connected to the static pressure hole and the total pressure hole. The port of the total pressure hole faces away from the airflow direction, and the port of the static pressure hole faces the airflow direction.

[0012] Preferably, the air valve adjustment module includes: a range DIP switch and a valve actuator.

[0013] Preferably, the communication module includes a communication interface and a communication conversion interface, which are connected by a wire.

[0014] Preferably, the communication setting module includes: a communication station number setting switch.

[0015] Preferably, the integrated control board has mounting holes at its four corners.

[0016] Preferably, the control method includes the following steps:

[0017] S1: Enter the desired airflow setting value;

[0018] S2: The air pressure detection module measures the air pressure inside the exhaust duct;

[0019] S3: Calculate the current air volume in the exhaust duct;

[0020] S4: Feedback on the current air volume and valve opening in the exhaust duct;

[0021] S5: If the current air volume in the exhaust duct deviates from the set value, the microprocessor calculates the valve opening using the PID algorithm and outputs a control signal;

[0022] S6: Changes in valve opening result in changes in air volume within the exhaust duct.

[0023] The advantages of this utility model are as follows: This utility model includes a microprocessor, a power supply module, a damper adjustment module, a wind pressure detection module, an A / D conversion module, a D / A conversion module, a communication module, and a communication setting module connected to the microprocessor. This utility model converts the detected exhaust duct pressure data into an analog signal through the wind pressure detection module and sends it to the A / D conversion module. The A / D conversion module converts the analog signal into a digital signal and sends it to the microprocessor. The damper adjustment module controlled by the microprocessor adjusts the damper opening to achieve precise control of the exhaust duct wind pressure, ensuring that the exhaust duct wind pressure range meets the production process requirements. By setting a foldable heat dissipation and protective shell assembly, the integrated control board components can be protected from wind, improving the service life of each component and allowing for heat dissipation. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0025] Figure 1 This is a flowchart of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of each module of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the foldable heat dissipation and protective shell assembly of this utility model when opened;

[0029] Figure 5 This is a schematic diagram of the closed structure of the foldable heat dissipation and protective shell assembly of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Integrated control board; 2. Microprocessor; 3. Power supply module; 4. Air valve adjustment module; 5. Air pressure detection module; 6. A / D conversion module; 7. D / A conversion module; 8. Communication module; 9. Communication setting module; 10. Folding heat dissipation and protective shell assembly; 101. Protective shell; 102. Sliding hinge seat; 103. Guide rod; 104. Limit plate; 105. Heat sink; 106. Pull plate; 31. 24V DC regulated power supply; 32. Relay; 33. 5V voltage conversion module; 34. 12V voltage conversion module; 51. Pressure sensor; 52. Pitot tube; 41. Range DIP switch; 42. Valve actuator; 91. Communication station number setting switch; 11. Mounting hole. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0035] Example 1, combined with Figures 1-3 Explanation:

[0036] An exhaust duct airflow control device based on wind pressure detection includes: an integrated control board 1, a microprocessor 2, a power supply module 3, a damper adjustment module 4, a wind pressure detection module 5, an A / D conversion module 6, a D / A conversion module 7, a communication module 8, and a communication setting module 9. The integrated control board 1 is disposed inside the exhaust duct, and the microprocessor 2 is fixedly mounted on the integrated control board 1. The power supply module 3, the damper adjustment module 4, the wind pressure detection module 5, the A / D conversion module 6, the D / A conversion module 7, the communication module 8, and the communication setting module 9 are electrically connected to the microprocessor 2.

[0037] Microprocessor 2, power supply module 3, air valve adjustment module 4, air pressure detection module 5, A / D conversion module 6, D / A conversion module 7, communication module 8, and communication setting module 9 are fixedly connected to the integrated control board 1 by welding.

[0038] The power supply module 3 includes: a 24V DC regulated power supply 31, a relay 32, a 5V voltage conversion module 33, and a 12V voltage conversion module 34.

[0039] The wind pressure detection module 5 includes a pressure sensor 51 and a Pitot tube 52. The pressure sensor 51 includes a static pressure contact and a total pressure contact. The static pressure contact is provided with a static pressure hole, and the total pressure contact is provided with a total pressure hole. Two sets of Pitot tubes 52 are provided. The two sets of Pitot tubes 52 are respectively connected to the static pressure hole and the total pressure hole. The port of the total pressure hole faces away from the airflow direction, and the port of the static pressure hole faces the airflow direction.

[0040] The air valve adjustment module 4 includes: a range DIP switch 41 and a valve actuator 42.

[0041] The communication module 8 includes a communication interface and a communication conversion interface, which are connected by a wire.

[0042] The communication setting module 9 includes: a communication station number setting switch 91.

[0043] The integrated control board 1 has mounting holes 11 at its four corners, which makes it easy to install the integrated control board 1 inside the ventilation duct.

[0044] A control method for an exhaust duct airflow control device based on wind pressure detection includes the following steps:

[0045] S1: Enter the desired airflow setting value;

[0046] S2: Wind pressure detection module 5 measures the wind pressure inside the exhaust duct;

[0047] S3: Calculate the current air volume in the exhaust duct;

[0048] S4: Feedback on the current air volume and valve opening in the exhaust duct;

[0049] S5: If the current air volume in the exhaust duct deviates from the set value, the microprocessor 2 calculates the valve opening using the PID algorithm and outputs a control signal;

[0050] S6: Changes in valve opening result in changes in air volume within the exhaust duct.

[0051] Example 2, based on Example 1, combined with... Figure 4 and Figure 5 Explanation:

[0052] It also includes: a foldable heat dissipation and protective shell assembly 10, which includes: a protective shell 101, a sliding hinge seat 102, a light rod 103, a limiting plate 104, a heat dissipation plate 105, and a pull plate 106. The protective shell 101 is detachably connected to the integrated control board 1 by screws. Two sets of light rods 103 are provided, and the lower ends of the two sets of light rods 103 are fixedly connected to the integrated control board 1. The sliding hinge seat 102 is slidably disposed on the light rod 103. The protective shell 101 and the sliding hinge seat 102 are hingedly connected by a hinge shaft. The limiting plate 104 is fixedly installed on the light rod 103. The heat dissipation plate 105 is disposed on the upper side of the protective shell 101, and the pull plate 106 is disposed on the outer side of the protective shell 101.

[0053] With this configuration, during use, the screws connecting the protective housing 101 to the integrated control board 1 are removed, and then the protective housing 101 is pulled up using the pull plate 106 to avoid the pitot tube 52. Then, the protective housing 101 can be opened around the hinge axis. The heat sink 105 can effectively dissipate heat from the internal components. The pull plate 106 facilitates the disassembly and assembly of the protective housing 101. The limit plate 104 can prevent the protective housing 101 from separating from the integrated control board 1, avoiding the loss of the protective housing 101 during maintenance. The guide rod 103 and the sliding hinge seat 102 can effectively avoid the pitot tube 52.

[0054] The working principle of this utility model:

[0055] The first step is that the wind pressure detection module 5 sends the detection data to the microprocessor 2. The wind pressure detection module 5 sends the detection data to the microprocessor 2, which includes: the differential pressure detection module detects the negative pressure value in the exhaust duct, the differential pressure detection module converts the negative pressure value in the exhaust duct into an analog signal, and then sends the analog signal to the A / D conversion module 6. The A / D conversion module 6 converts the analog signal into a digital signal and sends it to the microprocessor 2.

[0056] The second step involves the microprocessor 2 generating a corresponding control signal based on the detection data and sending the control signal to the damper adjustment module 4. This process includes the microprocessor 2 generating a corresponding control signal based on the digital signal, combined with the airflow setpoint, environmental parameters, and PID control parameters, using a PID algorithm, and sending the control signal to the D / A conversion module 7. The D / A conversion module 7 then converts the digital signal into an analog signal and sends it to the damper adjustment module 4.

[0057] The physical parameters in the second step include the area of ​​the exhaust duct, denoted as A, in cm². 3 Air density, denoted as ρ, is expressed in kg / m³. 3 The air volume correction factor is denoted as K; the pressure measured by the pressure sensor at time n is denoted as P(n), in Pa; the air velocity in the exhaust duct at time n is denoted as F(n), in m / s; and the air volume in the exhaust duct at time n is denoted as Q. n Unit m 3 / h; Air volume setpoint, denoted as Q, unit m. 3 / h; sampling period, denoted as T s The unit is milliseconds (ms); the control output at time n is denoted as u(n); the error at time n is denoted as e(n); and the proportional gain coefficient is denoted as K. p Integral gain coefficient, denoted as K i The differential gain coefficient, denoted as K. d The set value of the valve opening / closing angle at time n is denoted as θ(n).

[0058] The microprocessor calculates the air velocity and air volume in the exhaust duct from the pressure data, using the following formulas:

[0059]

[0060] Q(n) = 3600A·K·F(n);

[0061] The microprocessor control signal is derived from the PID algorithm, and the calculation formula is as follows:

[0062] e(n) = Q(n) - Q;

[0063]

[0064] Third, the damper adjustment module 4 controls the opening and closing degree of the damper according to the control signal, thereby adjusting the negative pressure value in the exhaust duct.

[0065] For those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model; therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the technical solution of the present utility model.

Claims

1. A ventilation duct airflow control device based on wind pressure detection, characterized in that, include: The integrated control board (1), microprocessor (2), power supply module (3), air valve adjustment module (4), air pressure detection module (5), A / D conversion module (6), D / A conversion module (7), communication module (8) and communication setting module (9) are installed inside the exhaust duct. The microprocessor (2) is fixedly installed on the integrated control board (1). The power supply module (3), air valve adjustment module (4), air pressure detection module (5), A / D conversion module (6), D / A conversion module (7), communication module (8) and communication setting module (9) are electrically connected to the microprocessor (2).

2. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The microprocessor (2), power supply module (3), air valve adjustment module (4), air pressure detection module (5), A / D conversion module (6), D / A conversion module (7), communication module (8) and communication setting module (9) are fixedly connected to the integrated control board (1) by welding.

3. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, Also includes: The foldable heat dissipation protective shell assembly (10) includes: a protective shell (101), a sliding hinge seat (102), a light rod (103), a limiting plate (104), a heat dissipation plate (105), and a pull plate (106). The protective shell (101) is detachably connected to the integrated control board (1) by screws. Two sets of light rods (103) are provided. The lower ends of the two sets of light rods (103) are fixedly connected to the integrated control board (1). The sliding hinge seat (102) is slidably disposed on the light rod (103). The protective shell (101) and the sliding hinge seat (102) are hinged together by a hinge shaft. The limiting plate (104) is fixedly installed on the light rod (103). The heat dissipation plate (105) is disposed on the upper side of the protective shell (101). The pull plate (106) is disposed on the outer side of the protective shell (101).

4. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The power supply module (3) includes: a 24V DC regulated power supply (31), a relay (32), a 5V voltage conversion module (33), and a 12V voltage conversion module (34).

5. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The wind pressure detection module (5) includes a pressure sensor (51) and a pitot tube (52). The pressure sensor (51) includes a static pressure contact and a total pressure contact. The static pressure contact is provided with a static pressure hole, and the total pressure contact is provided with a total pressure hole. The pitot tube (52) is provided in two sets. The two sets of pitot tubes (52) are respectively connected to the static pressure hole and the total pressure hole. The port of the total pressure hole faces away from the airflow direction, and the port of the static pressure hole faces the airflow direction.

6. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The air valve adjustment module (4) includes: a range dial switch (41) and a valve actuator (42).

7. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The communication module (8) includes a communication interface and a communication conversion interface, which are connected by wires.

8. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The communication setting module (9) includes: a communication station number setting switch (91).

9. The exhaust duct airflow control device based on wind pressure detection according to claim 1, characterized in that, The integrated control board (1) has mounting holes (11) at its four corners.

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