CN216080264U

CN216080264U - Novel fume chamber residual air volume control device

Info

Publication number: CN216080264U
Application number: CN202122080909.0U
Authority: CN
Inventors: 宋少阳; 祁书贤; 刘越; 杨帆; 韩晔
Original assignee: Tianjin Zhongfa Intelligent Technology Co ltd
Current assignee: Tianjin Zhongfa Intelligent Technology Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-18
Anticipated expiration: 2031-08-31

Abstract

The utility model relates to a novel fume hood residual air quantity control device, which relates to the technical field of fume hood residual air quantity control. The utility model can make the air quantity in the fume hood relatively stable and can accurately control.

Description

Novel fume chamber residual air volume control device

Technical Field

The utility model relates to the technical field of control over the residual air quantity of a fume hood, in particular to a novel control device for the residual air quantity of the fume hood.

Background

In the technical field of air volume control of experimental ventilation equipment, the existing ventilation cabinet realizes the control of the air speed within the range of 0.3-0.5 m/s by selecting the air speed to control the opening of an exhaust valve, and by adopting the control mode, the change of the air volume is relatively large, the air in the ventilation cabinet is relatively unstable, and the experiment is influenced.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provides a novel residual air volume control device for a fume hood.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a novel fume chamber residual air volume control device, including face air velocity transducer interface, door height sensor interface, the extension interface, power supply module, the power supply interface, starting switch and relay interface, CPU controller and air sensor interface, face air velocity transducer interface, door height sensor interface, the extension interface, power supply module, starting switch and relay interface and air sensor interface all are connected with the CPU controller, the power supply interface is connected with power supply module, face air velocity transducer interface even has face air velocity transducer, door height sensor interface even has door height sensor, air sensor interface even has air sensor, starting switch and relay interface are connected with the side valve of airing exhaust.

The expansion interface is a 485 output port of the bus.

The output signal of the surface wind speed sensor is 4-20 ma, an AD conversion module is connected between a surface wind speed sensor interface and the CPU controller, the surface wind speed sensor is connected with the AD conversion module through the surface wind speed sensor interface, and the AD conversion module converts a current signal output by the surface wind speed sensor into a voltage signal to the CPU controller.

The output signal of door height sensor is 4 ~ 20ma, also even has AD conversion module between door height sensor interface and the CPU controller, and the door height sensor passes through door height sensor interface and is connected with AD conversion module, and AD conversion module turns into the current signal of door height sensor output voltage signal and gives the CPU controller.

The door height sensor is a displacement sensor and is arranged on a lifting slide rail of the glass door.

The surface wind speed sensor is arranged on the vertical surface cabinet body on the glass door side of the fume hood.

The air quantity sensor is arranged on the air exhaust main pipe.

The utility model has the beneficial effects that: according to the utility model, the required air volume can be accurately calculated through the door height, the door width and the required surface air speed, the valve is opened through outputting corresponding control, the surface air speed is applied to measure the existing air speed, if the existing air speed is not met, corresponding supplement is carried out, the real-time air volume is measured through the air volume sensor at the exhaust side, and the opening degree of the valve is corrected in real time through comparing the real-time air volume with the required air volume. The utility model can make the air quantity in the fume hood relatively stable and can accurately control.

Drawings

FIG. 1 is a connection block diagram of the present invention;

FIG. 2 is a circuit diagram of the present invention;

in the figure: 1-a plane wind speed sensor interface; 2-door height sensor interface; 3-an expansion interface; 4-a power supply module; 5-a power supply interface; 6-starting switch and relay interface; 7-a CPU controller; 8-air volume sensor interface; 9-air quantity sensor; 10-plane wind speed sensor; 11-door height sensor;

the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in fig. 1 to 2, a novel ventilation cabinet residual air volume control device comprises a surface air velocity sensor interface 1, a door height sensor interface 2, an expansion interface 3, a power supply module 4, a power supply interface 5, a starting switch and relay interface 6, a CPU controller 7 and an air volume sensor interface 8, wherein the surface air velocity sensor interface 1, the door height sensor interface 2, the expansion interface 3, the power supply module 4, the starting switch and relay interface 6 and the air volume sensor interface 8 are all connected with the CPU controller 7, the power supply interface 5 is connected with the power supply module 4, an external 220v power supply supplies power to the power supply module 4 through the power supply interface 5, the power supply module 4 converts the power supply into +3.3v power to be supplied to the CPU controller 7, the surface air velocity sensor interface 1 is connected with a surface air velocity sensor 10, the door height sensor interface 2 is connected with a door height sensor 11, the sensor interface 8 is connected with an air volume sensor 9, the starting switch and the relay interface 6 are connected with the exhaust side valve.

The expansion interface 3 is a bus 485 output port.

The output signal of the surface wind speed sensor 10 is 4-20 ma, an AD conversion module is connected between the surface wind speed sensor interface 1 and the CPU controller 7, the surface wind speed sensor 10 is connected with the AD conversion module through the surface wind speed sensor interface 1, and the AD conversion module converts the current signal output by the surface wind speed sensor 10 into a voltage signal to be sent to the CPU controller 7.

Output signal of door height sensor 11 is 4 ~ 20ma, also even has AD conversion module between door height sensor interface 2 and the CPU controller 7, and door height sensor 11 passes through door height sensor interface 2 and is connected with AD conversion module, and AD conversion module turns into voltage signal with the current signal of door height sensor 11 output and gives CPU controller 7, and door height sensor 11 is displacement sensor.

The control program of the utility model is as follows:

when the glass door ventilation device works, the door height sensor 11 is installed on a lifting slide rail of a glass door, the door height sensor 11 can sense the opening height of the glass door of a ventilation cabinet, the surface wind speed sensor 10 capable of sensing the air quantity of the ventilation cabinet is installed on a vertical cabinet body on the side of the glass door of the ventilation cabinet, the air quantity sensor 9 capable of detecting the air quantity of exhausted air is installed on an air exhaust main pipe, the door height sensor 11 outputs 4-20 ma signals to be provided for the CPU controller 7, the CPU controller 7 reads the closing data and then controls the opening of the valve on the exhaust side according to a preset program and logic, the air quantity of exhausted air is detected in real time, and the opening of the exhaust valve is calibrated to be more accurate.

According to the utility model, the required air volume can be accurately calculated through the door height, the door width and the required surface air speed, the valve at the exhaust side is opened through outputting corresponding control, the surface air speed sensor 10 measures the existing air speed, if the existing air speed is not met, corresponding supplement is carried out, the real-time air volume is measured through the air volume sensor 9 at the exhaust side, and the opening degree of the valve is corrected in real time through comparing the real-time air volume with the required air volume. The utility model can make the air quantity in the fume hood relatively stable and can accurately control.

The "first" and "second" in the present invention are only for distinguishing the names of different parts, and do not represent the specifications thereof, nor the mounting order thereof.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

The utility model has been described in connection with the accompanying drawings, it is to be understood that the utility model is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the utility model, and all such modifications and variations are within the scope of the utility model.

Claims

1. A novel ventilation cabinet residual air quantity control device is characterized by comprising a surface air speed sensor interface (1), a door height sensor interface (2), an expansion interface (3), a power supply module (4), a power supply interface (5), a starting switch and relay interface (6), a CPU controller (7) and an air quantity sensor interface (8), wherein the surface air speed sensor interface (1), the door height sensor interface (2), the expansion interface (3), the power supply module (4), the starting switch and relay interface (6) and the air quantity sensor interface (8) are all connected with the CPU controller (7), the power supply interface (5) is connected with the power supply module (4), the surface air speed sensor interface (1) is connected with a surface air speed sensor (10), the door height sensor interface (2) is connected with a door height sensor (11), and the air quantity sensor interface (8) is connected with an air quantity sensor (9), the starting switch and the relay interface (6) are connected with the exhaust side valve.

2. The novel fume hood residual air volume control device according to the claim 1, characterized in that the expansion interface (3) is a bus 485 outlet.

3. The novel fume hood residual air volume control device according to claim 2, characterized in that an output signal of the surface air velocity sensor (10) is 4-20 ma, an AD conversion module is connected between the surface air velocity sensor interface (1) and the CPU controller (7), the surface air velocity sensor (10) is connected with the AD conversion module through the surface air velocity sensor interface (1), and the AD conversion module converts a current signal output by the surface air velocity sensor (10) into a voltage signal to the CPU controller (7).

4. The novel fume hood residual air volume control device according to claim 3, characterized in that an output signal of the door height sensor (11) is 4-20 ma, an AD conversion module is connected between the door height sensor interface (2) and the CPU controller (7), the door height sensor (11) is connected with the AD conversion module through the door height sensor interface (2), and the AD conversion module converts a current signal output by the door height sensor (11) into a voltage signal to the CPU controller (7).

5. The novel fume hood residual air quantity control device is characterized in that a door height sensor (11) is a displacement sensor, and the door height sensor (11) is installed on a lifting slide rail of a glass door.

6. A novel fume hood residual air volume control device according to claim 5, characterized in that the surface air velocity sensor (10) is mounted on the glass door side elevation cabinet body of the fume hood.

7. A novel fume hood residual air quantity control device according to claim 6, characterized in that the air quantity sensor (9) is installed on the exhaust main pipe.