A variable air volume adjustment method of a fume hood, an electronic device, and a storage medium

Abstract

The present application relates to the technical field of intelligent control, in particular to a variable air volume adjustment method of a fume hood, an electronic device and a storage medium, the fume hood has an opening, the opening is provided with a sliding door, the method comprises the following steps: in response to the experimental mode selected by the user on the interactive interface of the terminal, obtaining the target face wind speed set by the user and the opening height of the sliding door; obtaining the current height of the sliding door detected by the displacement sensor, and determining the moving distance and the moving direction of the sliding door according to the current height and the opening height; triggering the controller to control the driving unit to drive the sliding door to move in the moving direction until the displacement sensor detects that the sliding door reaches the opening height; obtaining the width of the sliding door, and determining the target exhaust air volume of the fume hood according to the width of the sliding door, the opening height and the target face wind speed; and triggering the controller to control the variable air volume venturi valve to adjust the air volume of the fume hood to the target exhaust air volume; the present application can realize accurate and efficient control of the face wind speed and the exhaust air volume in the fume hood.

Description

A method for regulating the variable air volume of a fume hood, electronic equipment, and storage medium. Technical Field

[0001] This invention relates to the field of intelligent control technology, specifically to a method for adjusting the variable air volume of a fume hood, an electronic device, and a storage medium. Background Technology

[0002] A fume hood serves as an operating platform for staff and also provides ventilation. It is a relatively enclosed cabinet with a certain volume of space, featuring a movable door at the front and an operating platform inside. This allows researchers to open the door and use the platform to conduct various experiments.

[0003] To make the experimental environment safer and more energy-efficient for on-site experimental operators, precise and efficient control of the face velocity and air volume inside the fume hood is required; the constant air volume control method used in related technologies for fume hoods cannot meet the needs of laboratories. Summary of the Invention

[0004] The purpose of this invention is to provide a method for adjusting the variable air volume of a fume hood, an electronic device, and a storage medium, which can achieve precise and efficient control of the face velocity and exhaust volume inside the fume hood.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, embodiments of the present invention provide a method for adjusting the variable air volume of a fume hood, wherein the fume hood has an opening, and a sliding door is slidably provided on the opening, the sliding door being used to cover or open the opening, and the fume hood is provided with: a controller, a drive unit for driving the sliding door to rise or fall, a displacement sensor for detecting the height value of the sliding door, and a variable air volume Venturi valve for adjusting the air volume of the fume hood, wherein the controller is signal-connected to the drive unit, the displacement sensor, and the variable air volume Venturi valve respectively;

[0007] The method includes the following steps:

[0008] In response to the experimental mode selected by the user in the terminal's interactive interface, the target face wind speed and the opening height of the sliding door set by the user are obtained;

[0009] The current height of the sliding door detected by the displacement sensor is obtained, and the moving distance and direction of the sliding door are determined based on the current height and the opening height.

[0010] The trigger controller controls the drive unit to drive the sliding door to move in the moving direction until the displacement sensor detects that the sliding door has reached the opening height;

[0011] The width of the sliding door is obtained, and the target exhaust volume of the fume hood is determined based on the width and opening height of the sliding door and the target surface wind speed. The controller is then triggered to control the variable air volume venturi valve to adjust the air volume of the fume hood to the target exhaust volume.

[0012] Optionally, the target exhaust volume is calculated using the following formula:

[0013] E = D × L × V × 3600;

[0014] Where E is the target exhaust volume in cubic meters per hour, D is the door height in meters, L is the door height in meters, and V is the target face velocity in meters per second.

[0015] Optionally, the method further includes:

[0016] In response to the emergency mode selected by the user in the terminal's interactive interface, the controller is triggered to control the variable air volume venturi valve to open to the maximum air volume at the maximum opening speed.

[0017] Optionally, the front panel of the fume hood is further provided with a zone sensor that is signal-connected to the controller, and the method further includes:

[0018] In response to the area sensor detecting that no one is in the operating area for the detection time, the controller sends an unmanned status signal to the terminal, displays the unmanned status signal on the terminal's interactive interface, and enters energy-saving mode.

[0019] The trigger controller controls the drive unit to drive the sliding door to the opening height corresponding to the energy-saving mode; wherein, the detection time and the opening height corresponding to the energy-saving mode are preset.

[0020] Optionally, the method further includes:

[0021] When the area sensor detects that someone is in the operating area for a certain period of time, the controller sends a presence status signal to the terminal, displays the presence status signal on the terminal's interactive interface, and enters experimental mode.

[0022] The trigger controller controls the drive unit to drive the sliding door to the opening height corresponding to the experimental mode; wherein, the delay time and the opening height corresponding to the experimental mode are preset.

[0023] Optionally, the variable air volume venturi valve is equipped with a differential pressure transmitter, and the method further includes:

[0024] When the differential pressure transmitter detects that the working pressure of the variable air volume venturi valve deviates from the working pressure range, an alarm signal is sent to the terminal through the controller, and an alarm prompt is displayed on the terminal's interactive interface.

[0025] Optionally, the method further includes:

[0026] Obtain the height range of the sliding door's lifting and lowering, and divide the height range into multiple sub-ranges;

[0027] In each sub-section, the sliding door is controlled to move to the height corresponding to that sub-section. Based on the width and height of the sliding door and the exhaust volume of the sliding door at that height, the face velocity of the sliding door at that height is calculated and used as the design face velocity.

[0028] The actual surface wind speed at multiple locations within the sub-interval is obtained using an anemometer. The deviation between the average value of the multiple measured surface wind speeds and the design surface wind speed is calculated to obtain the surface wind speed correction value for the sub-interval.

[0029] Within a data acquisition cycle, multiple real-time calculated design surface wind velocities are acquired, and the average of the multiple design surface wind velocities is taken to obtain the average surface wind speed.

[0030] The face wind speed correction value is determined based on the sub-interval of the sliding door height within the collection period. The sum of the face wind speed correction value and the average face wind speed is used as the face wind speed display value, which is then displayed on the interactive interface.

[0031] In a second aspect, embodiments of the present invention provide an electronic device, the electronic device comprising:

[0032] At least one processor;

[0033] At least one memory for storing at least one program;

[0034] When the at least one program is executed by the at least one processor, the at least one processor implements the variable air volume regulation method for the fume hood as described in any of the preceding claims.

[0035] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a processor-executable program, which, when executed by a processor, is used to perform the variable air volume adjustment method for a fume hood as described in any of the preceding claims.

[0036] The beneficial effects of this invention are as follows: This invention discloses a variable air volume (VAV) adjustment method, electronic equipment, and storage medium for a fume hood. Based on the opening height of the sliding door, this invention calculates the corresponding exhaust volume using a formula and sends it to the controller of the valve body in real time. Through the linkage control of the VAV venturi valve and the fume hood's airflow, a constant air velocity is maintained inside the fume hood, achieving precise and efficient control of the face velocity and exhaust volume within the fume hood. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a flowchart illustrating the variable air volume adjustment method for the fume hood in an embodiment of the present invention.

[0039] Figure 2 is a schematic diagram of the structure of the electronic device in an embodiment of the present invention. Detailed Implementation

[0040] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0041] Referring to Figure 1, Figure 1 illustrates a variable air volume adjustment method for a fume hood provided by the present invention. The fume hood has an opening, and a sliding door is slidably provided on the opening. The sliding door is used to cover or open the opening. The fume hood is provided with: a controller, a drive unit for driving the sliding door to rise or fall, a displacement sensor for detecting the height value of the sliding door, and a variable air volume Venturi valve for adjusting the air volume of the fume hood. The controller is signal-connected to the drive unit, the displacement sensor, and the variable air volume Venturi valve, respectively.

[0042] The method includes the following steps:

[0043] S100, in response to the experimental mode selected by the user in the terminal's interactive interface, obtains the target face wind speed and the opening height of the sliding door set by the user.

[0044] S200, obtain the current height detected by the displacement sensor of the sliding door, and determine the moving distance and moving direction of the sliding door based on the current height and the opening height;

[0045] S300, the trigger controller controls the drive unit to drive the sliding door to move in the moving direction until the displacement sensor detects that the sliding door has reached the opening height;

[0046] Specifically, the fume hood is also equipped with a controller, which is communicatively connected to a terminal. Users interact with the control system through the terminal and execute control commands through the controller. The terminal's interface provides an experimental mode and an energy-saving mode. In energy-saving mode, the fume hood is controlled for energy efficiency.

[0047] The experimental mode meets the operator's need to maintain a certain height of the sliding door and a certain airflow within the fume hood during experiments; the operator can set the experiment duration. During the set time, it remains in manual mode and will not enter energy-saving mode. The experimental mode requires a countdown timer; after the countdown ends, it will revert to energy-saving mode, the sliding door will automatically lower, and energy-saving control will be implemented.

[0048] S400, obtain the width of the sliding door, determine the target exhaust volume of the fume hood based on the width and opening height of the sliding door and the target surface wind speed, and trigger the controller to control the variable air volume venturi valve to adjust the air volume of the fume hood to the target exhaust volume.

[0049] It should be noted that this invention calculates the corresponding exhaust volume based on the opening height of the sliding door using a formula and sends it to the controller of the valve body in real time. Through the linkage control of the variable air volume venturi valve and the fume hood's airflow, a constant air velocity is maintained inside the fume hood, achieving precise and efficient control of the face velocity and exhaust volume within the fume hood.

[0050] In some embodiments, the target exhaust volume is calculated using the following formula:

[0051] E = D × L × V × 3600;

[0052] Where E is the target exhaust volume in cubic meters per hour, D is the door height in meters, L is the door height in meters, and V is the target face velocity in meters per second.

[0053] In some embodiments, the method further includes:

[0054] In response to the emergency mode selected by the user in the terminal's interactive interface, the controller is triggered to control the variable air volume venturi valve to open to the maximum air volume at the maximum opening speed.

[0055] In an emergency, to effectively prevent toxic gases from escaping the fume hood, the sliding door is forcibly disengaged from the drive unit and enters manual mode. The interactive interface (LCD touchscreen) emits a buzzer sound and displays alarm information.

[0056] In some embodiments, the front panel of the fume hood is further provided with a zone sensor connected to the controller signal, and the method further includes:

[0057] In response to the area sensor detecting that no one is in the operating area for the detection time, the controller sends an unmanned status signal to the terminal, displays the unmanned status signal on the terminal's interactive interface, and enters energy-saving mode.

[0058] The trigger controller controls the drive unit to drive the sliding door to the opening height corresponding to the energy-saving mode; wherein, the detection time and the opening height corresponding to the energy-saving mode are preset.

[0059] When operators conduct experiments in the operating area in front of the fume hood, they need to manually push the sliding door up or down. After a certain period of time after the operator leaves the operating area, when the area sensor installed on the top of the fume hood detects that the operating area below is unoccupied for the specified detection time, the system enters energy-saving mode, and the sliding door automatically lowers to the designated height. The detection time for entering energy-saving mode and the designated door height for energy-saving mode are configurable. Specifically, the area sensor installed on the top of the fume hood detects whether an operator is working in the operating area. When the area sensor detects that the operating area is unoccupied for the specified detection time, it sends an unoccupied status signal to the fume hood automatic door controller. After the unoccupied status signal continues for several seconds, the system enters the energy-saving mode page. The detection time for entering energy-saving mode and the designated door height for energy-saving mode are configurable.

[0060] In some embodiments, the method further includes:

[0061] When the area sensor detects that someone is in the operating area for a certain period of time, the controller sends a presence status signal to the terminal, displays the presence status signal on the terminal's interactive interface, and enters experimental mode.

[0062] The trigger controller controls the drive unit to drive the sliding door to the opening height corresponding to the experimental mode; wherein, the delay time and the opening height corresponding to the experimental mode are preset.

[0063] When the operator re-enters the operating area and the specified delay time is reached, the energy-saving mode exits and enters the experimental mode, with the sliding door automatically rising to the designated height. The delay time for exiting energy-saving mode and the designated door height are configurable. Operators can set either no delay or a delay for exiting energy-saving mode, depending on their needs. The delay time for exiting energy-saving mode prevents unauthorized personnel from accidentally triggering the exit mechanism and causing the sliding door to automatically rise.

[0064] In some embodiments, the variable air volume venturi valve is equipped with a differential pressure transmitter, and the method further includes:

[0065] When the differential pressure transmitter detects that the working pressure of the variable air volume venturi valve deviates from the working pressure range, an alarm signal is sent to the terminal through the controller, and an alarm prompt is displayed on the terminal's interactive interface.

[0066] Specifically, the differential pressure transmitter determines whether the working pressure of the variable air volume venturi valve is within the normal range of 150 to 750 Pa; if it is lower or higher than the working pressure range, it will trigger an alarm prompt through the interactive interface.

[0067] In some embodiments, the method further includes:

[0068] Obtain the height range of the sliding door's lifting and lowering, and divide the height range into multiple sub-ranges;

[0069] In each sub-section, the sliding door is controlled to move to the height corresponding to that sub-section. Based on the width and height of the sliding door and the exhaust volume of the sliding door at that height, the face velocity of the sliding door at that height is calculated and used as the design face velocity.

[0070] The actual surface wind speed at multiple locations within the sub-interval is obtained using an anemometer. The deviation between the average value of the multiple measured surface wind speeds and the design surface wind speed is calculated to obtain the surface wind speed correction value for the sub-interval.

[0071] Within a data acquisition cycle, multiple real-time calculated design surface wind velocities are acquired, and the average of the multiple design surface wind velocities is taken to obtain the average surface wind speed.

[0072] The face wind speed correction value is determined based on the sub-interval of the sliding door height within the collection period. The sum of the face wind speed correction value and the average face wind speed is used as the face wind speed display value, which is then displayed on the interactive interface.

[0073] It should be noted that due to individual differences in fume hoods, the actual face velocity will vary slightly from the design face velocity as the sliding door moves at different heights. A face velocity correction value is added to adjust the design face velocity according to the sliding door height to obtain the displayed face velocity value, in meters per second (m / s). For example, if the real-time height is between 10 and 20 cm, the corresponding face velocity correction value is increased by 0.10 m / s; if the real-time height is between 40 and 50 cm, the corresponding face velocity correction value is decreased by 0.08 m / s. When the sliding door... If the real-time height of the sliding door is 15cm and the designed face wind speed is 0.43, then the face wind speed display value is 0.43 + 0.10 = 0.53 m / s; if the real-time height of the sliding door is 45cm and the designed face wind speed is 0.57, then the face wind speed display value is 0.57 - 0.08 = 0.49 m / s; to avoid frequent fluctuations in the displayed face wind speed value, multiple design face wind speed readings are collected in 10-second intervals, the average value is taken, and then added to the average face wind speed to obtain and display the face wind speed value.

[0074] Corresponding to the method in Figure 1, referring to Figure 2, an embodiment of the present invention provides an electronic device, including:

[0075] At least one processor;

[0076] At least one memory for storing at least one program;

[0077] When the at least one program is executed by the at least one processor, the at least one processor performs the method described above.

[0078] It is evident that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0079] Furthermore, embodiments of the present invention also disclose a computer program product or computer program stored in a computer-readable storage medium. A processor of a computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, causing the computer device to perform the described method. Similarly, the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0080] It will be understood by those skilled in the art that all or some of the methods and systems disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0081] The above is a detailed description of the preferred embodiments of this disclosure. However, this disclosure is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this disclosure. All such equivalent modifications or substitutions are included within the scope defined by the claims of this disclosure.

Claims

1. A method for adjusting the variable air volume of a fume hood, characterized in that, The fume hood has an opening, and a sliding door is slidably mounted on the opening. The sliding door is used to cover or open the opening. The fume hood is equipped with: a controller, a drive unit for driving the sliding door to rise or fall, a displacement sensor for detecting the height of the sliding door, and a variable air volume (VAV) Venturi valve for adjusting the airflow of the fume hood. The VAV Venturi valve is equipped with a differential pressure transmitter. The controller is connected to the drive unit, the displacement sensor, and the VAV Venturi valve. The method includes the following steps: responding to the experimental mode selected by the user on the terminal's interactive interface, acquiring the target surface wind speed and the opening height of the sliding door set by the user; acquiring the current height detected by the displacement sensor of the sliding door, and determining the moving distance and moving direction of the sliding door based on the current height and the opening height; triggering the controller to control the drive unit to drive the sliding door to move in the moving direction until the displacement sensor detects that the sliding door has reached the opening height; acquiring the width of the sliding door, and determining the moving distance and moving direction of the sliding door based on the width of the sliding door and the opening height. The target face velocity determines the target exhaust volume of the fume hood, triggering the controller to adjust the air volume of the fume hood to the target exhaust volume using a variable air volume venturi valve. The height range of the sliding door is obtained and divided into multiple sub-ranges. In each sub-range, the sliding door is moved to the corresponding height. Based on the width, height, and exhaust volume of the sliding door at that height, the face velocity corresponding to that height is calculated as the design face velocity. An anemometer is used to measure the actual face velocity at multiple locations within the sub-range. The deviation between the average of the measured face velocities and the design face velocity is calculated to obtain the face velocity correction value for that sub-range. Within one acquisition cycle, multiple real-time calculated design face velocities are acquired, and the average of these design face velocities is obtained to obtain the average face velocity. Based on the sub-range where the sliding door's height is located within the acquisition cycle, the face velocity correction value is determined. The sum of the face velocity correction value and the average face velocity is used as the face velocity display value, which is then displayed on the interactive interface.

2. The method for adjusting the variable air volume of a fume hood according to claim 1, characterized in that, The target exhaust volume is calculated using the following formula: E = D × L × V × 3600; where E is the target exhaust volume in cubic meters per hour, D is the door height in meters, L is the door width in meters, and V is the target surface wind speed in meters per second.

3. The method for adjusting the variable air volume of a fume hood according to claim 1, characterized in that, The method further includes: in response to the emergency mode selected by the user on the terminal's interactive interface, triggering the controller to control the variable air volume venturi valve to open to the maximum air volume at the maximum opening speed.

4. The method for adjusting the variable air volume of a fume hood according to claim 1, characterized in that, The front panel of the fume hood is also equipped with an area sensor that is signal-connected to the controller. The method further includes: responding to the area sensor detecting that no one is in the operating area for a detection time, sending an unoccupied status signal to the terminal through the controller, displaying the unoccupied status signal on the interactive interface of the terminal, and entering the energy-saving mode; triggering the controller to control the drive unit to drive the sliding door to the opening height corresponding to the energy-saving mode; wherein, the detection time and the opening height corresponding to the energy-saving mode are preset.

5. The method for adjusting the variable air volume of a fume hood according to claim 1, characterized in that, The method further includes: responding to a situation where the area sensor detects that someone is in the operating area for a certain period of time, sending a person status signal to the terminal through the controller, displaying the person status signal on the terminal's interactive interface, and entering the experimental mode; triggering the controller to control the drive unit to drive the sliding door to the opening height corresponding to the experimental mode; wherein the delay time and the opening height corresponding to the experimental mode are preset.

6. The method for adjusting the variable air volume of a fume hood according to claim 1, characterized in that, The method further includes: in response to the differential pressure transmitter detecting that the working pressure of the variable air volume venturi valve deviates from the working pressure range, sending an alarm signal to the terminal through the controller, and displaying an alarm prompt on the terminal's interactive interface.

7. An electronic device, characterized in that, The electronic device includes: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the variable air volume regulation method for the fume hood as described in any one of claims 1 to 6.

8. A computer-readable storage medium storing a processor-executable program, characterized in that, The processor-executable program, when executed by the processor, is used to perform the method as described in any one of claims 1 to 6.

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