CN219299584U

CN219299584U - Wind speed monitoring system of biosafety cabinet and biosafety cabinet

Info

Publication number: CN219299584U
Application number: CN202222577537.7U
Authority: CN
Inventors: 张桂宇; 朱立国; 温英利; 贾平平
Original assignee: Biobase Biodustry Shandong Co Ltd
Current assignee: Biobase Biodustry Shandong Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-07-04
Anticipated expiration: 2032-09-28

Abstract

The utility model provides a wind speed monitoring system of a biosafety cabinet and the biosafety cabinet. The system comprises a main control board, wherein the main control board comprises a main control chip, a PWM (pulse-Width modulation) unit and a judging unit; the judging unit is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value; when the Pulse Width Modulation (PWM) modulation unit judges that the current wind speed is greater than the wind speed threshold value according to the judgment unit, the duty ratio of PWM is reduced, and a first duty ratio is generated; the main control chip reduces the current wind speed according to the first duty ratio to generate a first wind speed; when the PWM modulation unit judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit, the duty ratio of PWM is increased, and a second duty ratio is generated; the main control chip increases the current wind speed according to the second duty ratio, generates the second wind speed, and modulates the PWM duty ratio through the PWM modulation unit according to the comparison result of the current wind speed and the wind speed threshold value while controlling the rotating speed of the fan, thereby realizing the function of automatic modulation according to the wind speed change.

Description

Wind speed monitoring system of biosafety cabinet and biosafety cabinet

[ field of technology ]

The utility model relates to the technical field of wind speed monitoring, in particular to a wind speed monitoring system of a biosafety cabinet and the biosafety cabinet.

[ background Art ]

When the medical clean bench is used, the pressure of clean air flow is higher than the pressure of the outside, so that the outside harmful gas cannot enter, and the cleanliness and accuracy of the experiment are ensured. Different experiments have different requirements on the wind speed, and products with requirements on the air flow and the wind speed are based on the modulation of the fan.

In the related art, when a modulation mode of a fan adopts silicon controlled modulation, a modulation interval is smaller, and the air speed reduction or the air speed increase caused by the reduction of the performance of a filter and the environmental problem cannot be accurately regulated, and manual regulation is required, so that the regulated air speed is overlarge or overlarge; when the centrifugal fan is used for adjusting the duty ratio of output to modulate the fan, although the rotating speed of the fan can be accurately controlled, the fan cannot be manually controlled, so that the rotating speed index of the fan is a fixed value, and modulation according to the change of wind speed cannot be realized.

[ utility model ]

In view of the above, the utility model provides a wind speed monitoring system of a biosafety cabinet and the biosafety cabinet, which are used for realizing the function of modulating according to the change of wind speed while controlling the rotating speed of a fan.

In a first aspect, the utility model provides a wind speed monitoring system of a biosafety cabinet, the system comprises a main control board, wherein the main control board comprises a main control chip, a PWM (pulse-width modulation) unit and a judging unit; the PWM modulation unit is connected with the main control chip and the judging unit; the judging unit is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value; the Pulse Width Modulation (PWM) modulation unit reduces the duty ratio of PWM to generate a first duty ratio according to the judgment unit judging that the current wind speed is greater than the wind speed threshold value; the main control chip reduces the current wind speed according to the first duty ratio to generate a first wind speed; when the PWM modulation unit judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit, the PWM duty ratio is increased, and a second duty ratio is generated; and the main control chip increases the current wind speed according to the second duty ratio to generate a second wind speed.

Optionally, the first wind speed comprises first wind speed data; the second wind speed includes second wind speed data; the system further comprises a display screen; the display screen is connected with the main control chip; the main control chip sends the first wind speed data to a display screen so that the display screen can display the first wind speed data; and sending the second wind speed data to a display screen so that the display screen can display the second wind speed data.

Optionally, the system further comprises a fan, a wind speed sensor and an anemometer; the main control chip is connected with the fan, the wind speed sensor and the anemometer; the method comprises the steps that a fan responds to a wind speed instruction input by an operator, and an initial wind speed is set, wherein the initial wind speed comprises initial wind speed data; the wind speed sensor sends the monitored initial wind speed data to the main control chip; the main control chip determines a third wind speed according to the initial wind speed data; determining a current wind speed according to the comparison result of the initial wind speed, the third wind speed and the fourth wind speed sent by the anemometer, wherein the current wind speed comprises current wind speed data; and the display screen receives the current wind speed data sent by the main control chip and displays the current wind speed data.

Optionally, the PWM modulation unit includes a power supply VCC, a sliding rheostat R1, an NPN transistor Q1, a PNP transistor Q2, and D-FAN-OUT ports.

In a second aspect, the present utility model provides a biosafety cabinet comprising: the wind speed monitoring system of the biosafety cabinet provided in the first aspect or any possible implementation of the first aspect.

The utility model provides a wind speed monitoring system of a biosafety cabinet, which comprises a main control board, wherein the main control board comprises a main control chip, a PWM (pulse-width modulation) unit and a judging unit; the PWM modulation unit is connected with the main control chip and the judging unit; the judging unit is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value, when the Pulse Width Modulation (PWM) modulating unit judges that the current wind speed is larger than the wind speed threshold value according to the judging unit, the duty ratio of PWM is reduced to generate a first duty ratio, and the main control chip reduces the current wind speed according to the first duty ratio to generate the first wind speed; when the PWM modulation unit judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit, the duty ratio of PWM is increased to generate a second duty ratio, the main control chip increases the current wind speed according to the second duty ratio to generate a second wind speed, and the main control chip modulates the duty ratio of PWM according to the comparison result of the current wind speed and the wind speed threshold value while controlling the rotating speed of the fan, so that the function of automatic modulation according to the wind speed change is realized.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a wind speed monitoring system of a biosafety cabinet according to the utility model;

fig. 2 is a schematic circuit diagram of a PWM modulation unit according to the present utility model.

[ detailed description ] of the utility model

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terminology used in the present utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.

Fig. 1 is a schematic structural diagram of a wind speed monitoring system of a biosafety cabinet according to the present utility model, as shown in fig. 1, the system includes: the main control board 1, wherein the main control board 1 comprises a main control chip 11, a PWM modulation unit 12 and a judgment unit 13. The PWM modulation unit 12 is connected to the main control chip 11 and the judging unit 13.

The judging unit 13 is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value; when the Pulse Width Modulation (PWM) modulation unit 12 judges that the current wind speed is greater than the wind speed threshold value according to the judgment unit 13, the duty ratio of PWM is reduced, and a first duty ratio is generated; the main control chip 11 reduces the current wind speed according to the first duty ratio to generate a first wind speed; when the PWM modulation unit 12 judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit 13, the duty ratio of PWM is increased, and a second duty ratio is generated; the main control chip 11 increases the current wind speed according to the second duty ratio to generate a second wind speed.

In the utility model, the first wind speed comprises first wind speed data; the second wind speed includes second wind speed data; the system also comprises a display screen 2, wherein the display screen 2 is connected with the main control chip 11.

The main control chip 11 sends first wind speed data to the display screen 2 so that the display screen 2 can display the first wind speed data; the second wind speed data is sent to the display screen 2 for the display screen 2 to display the second wind speed data.

In the utility model, the system also comprises a fan 3, an air speed sensor 4 and an anemometer 5, and the main control chip 11 is connected with the fan 3, the air speed sensor 4 and the anemometer 5.

The fan 3 responds to a wind speed instruction input by an operator, and sets an initial wind speed, wherein the initial wind speed comprises initial wind speed data; the wind speed sensor 4 sends the monitored initial wind speed data to the main control chip 11; the main control chip 11 determines a third wind speed according to the initial wind speed data; determining a current wind speed according to the comparison result of the initial wind speed, the third wind speed and the fourth wind speed sent by the anemometer 5, wherein the current wind speed comprises current wind speed data; the display screen 2 receives the current wind speed data sent by the main control chip 11 and displays the current wind speed data.

Fig. 2 is a schematic circuit diagram of a PWM modulation unit according to the present utility model, and as shown in fig. 2, the PWM modulation unit includes a power supply VCC 121, a sliding rheostat R1 122, an NPN transistor Q1 123, a PNP transistor Q2 124, and a D-FAN-OUT port 125.

The D-FAN1 port of the main control chip 11 is connected with the Q1 123. The main control chip 11 sends a PWM signal to the Q1 123 of the PWM modulation unit 12 through the D-FAN1 port, and when the PWM signal is at a high level, the Q1 123 is turned on at the moment; the D-FAN-OUT port 125 is connected with the FAN 3, the PWM modulation unit 12 outputs voltage to the FAN 3 through the D-FAN-OUT port 125, and when the PWM signal is in a high level and the voltage is 1, the opening of the FAN 3 is controlled at the moment; when the PWM signal is low, the voltage is 0, and the fan 3 is controlled to be turned off.

In the utility model, the PWM modulation unit modulates the duty ratio of PWM so as to control the rotating speed of the fan, namely the wind speed.

In the present utility model, the circuit diagram can control the output of different voltages by adjusting the sliding rheostat R1 122.

In the technical scheme of the wind speed monitoring system of the biosafety cabinet, a main control chip is connected with a PWM (pulse-width modulation) unit, a fan, a wind speed sensor and an anemometer, and the PWM unit is connected with a judging unit; the judging unit is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value, when the Pulse Width Modulation (PWM) modulating unit judges that the current wind speed is larger than the wind speed threshold value according to the judging unit, the duty ratio of PWM is reduced to generate a first duty ratio, and the main control chip reduces the current wind speed according to the first duty ratio to generate the first wind speed; when the PWM modulation unit judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit, the duty ratio of PWM is increased to generate a second duty ratio, the main control chip increases the current wind speed according to the second duty ratio to generate a second wind speed, and the main control chip modulates the duty ratio of PWM according to the comparison result of the current wind speed and the wind speed threshold value while controlling the rotating speed of the fan, so that the function of automatic modulation according to the wind speed change is realized.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present utility model.

In the several embodiments provided by the present utility model, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.

Claims

1. The wind speed monitoring system of the biosafety cabinet is characterized by comprising a main control board, wherein the main control board comprises a main control chip, a PWM (pulse-Width modulation) unit and a judging unit; the PWM modulation unit is connected with the main control chip and the judging unit; the judging unit is used for judging whether the current wind speed is larger than or smaller than a set wind speed threshold value; the PWM modulation unit reduces the duty ratio of PWM to generate a first duty ratio when judging that the current wind speed is greater than a wind speed threshold value according to the judgment unit; the main control chip reduces the current wind speed according to the first duty ratio to generate a first wind speed; when the PWM modulation unit judges that the current wind speed is smaller than the wind speed threshold value according to the judgment unit, the PWM duty ratio is increased, and a second duty ratio is generated; and the main control chip increases the current wind speed according to the second duty ratio to generate a second wind speed.

2. The system of claim 1, wherein the first wind speed comprises first wind speed data; the second wind speed includes second wind speed data; the system further comprises a display screen; the display screen is connected with the main control chip; the main control chip sends the first wind speed data to a display screen so that the display screen can display the first wind speed data; and sending the second wind speed data to a display screen so that the display screen can display the second wind speed data.

3. The system of claim 1, further comprising a wind turbine, a wind speed sensor, and an anemometer; the main control chip is connected with the fan, the wind speed sensor and the anemometer; the method comprises the steps that a fan responds to a wind speed instruction input by an operator, and an initial wind speed is set, wherein the initial wind speed comprises initial wind speed data; the wind speed sensor sends the monitored initial wind speed data to the main control chip; the main control chip determines a third wind speed according to the initial wind speed data; determining a current wind speed according to the comparison result of the initial wind speed, the third wind speed and the fourth wind speed sent by the anemometer; and the display screen receives the current wind speed sent by the main control chip and displays the current wind speed.

4. The system of claim 1, wherein the PWM modulation unit comprises power supply VCC, slide rheostat R1, NPN transistor Q1, PNP transistor Q2, and D-FAN-OUT ports.

5. A biosafety cabinet comprising: a wind speed monitoring system for a biosafety cabinet as recited in any one of claims 1-4.