Air suction rate control method and system of ventilation cabinet for experiment

Abstract

The invention discloses an air suction rate control method and system for a ventilation cabinet for an experiment, and the method comprises the steps: controlling a cabinet door to move when it is detected that the experiment needs to be started, so as to move the cabinet door to a position meeting the current experiment requirement; determining the opening degree of the cabinet door according to the position of the cabinet door, and determining the area of the opening of the experimental area according to the opening degree of the cabinet door; and according to the area of the opening of the experimental area, determining the target air suction amount currently required by the fume hood, and performing air suction on the fume hood according to the target air suction amount. The problem of inaccurate air exhaust control in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, and in particular to an air extraction volume control method and system for an experimental fume hood. Background Art

[0002] Fume hoods are a type of local exhaust equipment commonly used in laboratories. Fume hoods can completely and promptly exhaust harmful gases from the workplace, and can prevent operators from inhaling toxic, harmful, and odorous gases, thus providing good protection for operators. Fume hoods are usually equipped with experimental areas, which are separated from the outside world by closed doors. Operators conduct experiments in the experimental areas, and the fans of the fume hoods exhaust harmful gases.

[0003] In the prior art, the exhaust volume of the fan of the fume hood is constant. However, under different experimental requirements or different heights of the operators themselves, the opening of the cabinet door will be different, thereby making the opening area of ​​the experimental area different. The constant exhaust volume cannot adapt to the variable cabinet door opening, which leads to inaccurate exhaust. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method and system for controlling the air extraction volume of a fume hood for an experiment, aiming to solve the problem of inaccurate air extraction control of a fume hood in the prior art.

[0005] The present invention is achieved in that:

[0006] A method for controlling the exhaust volume of a fume hood for an experiment is used to exhaust air from the fume hood for the experiment. The fume hood includes a cabinet body with an experimental area inside, and a cabinet door of the experimental area arranged in the cabinet body and movable up and down along the cabinet body to control the opening size of the experimental area. The back of the cabinet body is provided with an exhaust port, and the exhaust port is used to exhaust the gas generated in the experimental area. The method includes:

[0007] When it is detected that an experiment needs to be started, the cabinet door is controlled to move to a position that meets the current experimental requirements;

[0008] Determining the opening of the cabinet door according to the position of the cabinet door, and determining the area of ​​the opening of the experimental area according to the opening of the cabinet door;

[0009] The target air extraction volume currently required by the fume hood is determined according to the area of ​​the opening of the experimental area, and the fume hood is evacuated according to the target air extraction volume.

[0010] Furthermore, in the above-mentioned method for controlling the air extraction volume of the fume hood, the step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises:

[0011] The cross-sectional area of ​​the arm portion of the experiment operator blocking the opening during the current experiment is obtained, the final opening area is determined according to the area of ​​the opening of the experimental area and the cross-sectional area, and the target air extraction volume is determined according to the final opening area.

[0012] Furthermore, in the above-mentioned method for controlling the exhaust volume of the fume hood, the bottom of the cabinet door, the bottom of the cabinet body, and both sides of the cabinet body are relatively provided with infrared detection arrays, and the step of obtaining the cross-sectional area of ​​the arm portion of the experimental operator blocking the opening during the current experiment includes:

[0013] A preset coordinate system is constructed with the preset point as the center, the distance information between the infrared detection array and the arm part is obtained, and the distance information is converted into coordinate information according to the preset coordinate system to obtain a plurality of contour points;

[0014] The contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour.

[0015] Furthermore, in the above-mentioned method for controlling the exhaust volume of the fume hood, the infrared detection arrays at the bottom of the cabinet door and the bottom of the cabinet body are arranged in a staggered manner, and the contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour. The step includes:

[0016] Determine the symmetry axis of the arm portion at the opening according to the contour points of the arm portion detected by the infrared detection array on one side of the cabinet,

[0017] According to the symmetry axis, the contour points detected by the infrared detection array at the bottom of the cabinet door and the bottom of the cabinet are mirrored to obtain multiple virtual contour points, and the virtual contour points and contour points are fitted to obtain the contour of the arm part at the opening.

[0018] Furthermore, in the above-mentioned method for controlling the air extraction volume of the fume hood, the step of fitting the virtual contour points and the contour points to obtain the contour of the arm part at the opening includes:

[0019] Determining whether the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet;

[0020] If the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet, the virtual contour point is removed.

[0021] Furthermore, in the above-mentioned method for controlling the air extraction volume of the fume hood, the step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises:

[0022] According to the area of ​​the opening of the experimental area, the target air extraction volume corresponding to the area of ​​the opening of the experimental area is searched in a preset mapping table.

[0023] Furthermore, in the above-mentioned method for controlling the air extraction volume of the fume hood, after the step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, the method further includes:

[0024] The temperature and humidity in the experimental area are obtained, an adjustment coefficient is determined according to the temperature and humidity, and the target air extraction volume is adjusted according to the adjustment coefficient to obtain a final target air extraction volume.

[0025] Another object of the present invention is to provide an air extraction volume control system for an experimental fume hood, which is used to extract air from the experimental fume hood. The fume hood includes a cabinet body with an experimental area inside, and a cabinet door of the experimental area arranged in the cabinet body that can move up and down along the cabinet body to control the opening size of the experimental area. The back of the cabinet body is provided with an air extraction port, and the air extraction port is used to discharge the gas generated in the experimental area. The system includes:

[0026] A detection module, for controlling the cabinet door to move to a position that meets the current experimental requirements when detecting that an experiment needs to be started;

[0027] A determination module, used to determine the opening of the cabinet door according to the position of the cabinet door, and determine the area of ​​the opening of the experimental area according to the opening of the cabinet door;

[0028] The control module is used to determine the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, and to extract air from the fume hood according to the target air extraction volume.

[0029] The present invention obtains the opening of the door of the fume hood during the experiment, thereby determining the current opening area of ​​the fume hood, and then determining the target air extraction volume corresponding to the opening area, and exhausts the fume hood according to the target air extraction volume, thereby achieving corresponding air extraction processing for different door opening conditions. The problem of inaccurate fume hood exhaust control in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a fume hood in a method for controlling the air extraction volume of an experimental fume hood in one embodiment of the present invention;

[0031] Figure 2 It is a flow chart of the air extraction volume control method of the fume hood used in the experiment in the first embodiment of the present invention;

[0032] Figure 3 It is a structural block diagram of the air extraction volume control system of the fume hood used in the experiment in the third embodiment of the present invention.

[0033] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed types.

[0037] The following embodiments can be applied to Figure 1 Among the fume hoods shown, Figure 1 The structure shown is a schematic diagram of the structure of a fume hood provided in one embodiment of the present invention, wherein:

[0038] The fume hood includes a cabinet body 10 and a cabinet door 20 arranged on the cabinet body 10. An experimental area 30 is formed between the cabinet door 20 and the cabinet body 10. The experimental area 30 is used for experimental operations. The cabinet door 20 is slidably connected to the cabinet body 10, and the cabinet door 20 can move up and down along the cabinet body 10, so that the opening of the cabinet door 20 is adjustable, that is, the opening of the experimental area 30 is adjustable, so as to adapt to different experimental requirements and the height requirements of the operator. When conducting an experiment, the operator can control the cabinet door 20 by turning on and off the electric control switch on the cabinet body 10. 0 is moved to a position on the cabinet 10, or a corresponding sensor is configured. After the cabinet door 20 is opened and moved, the cabinet door 20 is controlled to stop moving by monitoring information through the sensor. For example, when the sensor detects a set distance from the operator's arm, the cabinet door 20 is controlled to stop moving downward. In order to achieve exhaust in the experimental area 30, a plurality of exhaust ports are provided on the back of the cabinet. The gas in the experimental area 30 can be discharged by connecting the exhaust equipment, wherein the exhaust volume can be controlled by controlling the power of the exhaust equipment or the opening and closing of the exhaust port.

[0039] How to improve the accuracy of air extraction of the exhaust cabinet will be described in detail below with reference to specific embodiments and drawings.

[0040] Embodiment 1

[0041] See also Figure 2 , shown is a method for controlling the exhaust volume of an experimental fume hood in a first embodiment of the present invention, which is used to exhaust air from an experimental fume hood, wherein the fume hood comprises a cabinet body having an experimental area therein, and a cabinet door of the experimental area arranged in the cabinet body and movable up and down along the cabinet body to control the opening size of the experimental area, and an exhaust port is arranged on the back of the cabinet body, and the exhaust port is used to discharge the gas generated in the experimental area, and the method comprises steps S10 to S12.

[0042] Step S10, when it is detected that an experiment needs to be started, the cabinet door is controlled to move to a position that meets the current experimental requirements.

[0043] Among them, the instruction on whether to start the experiment can be sent through the key switch integrated in the cabinet. Specifically, the key switch can be set separately, or the switch of the cabinet door can be used to control this function. When the control of opening the cabinet door is detected, it can be determined that the experiment needs to start, and then the cabinet door is controlled to move to the required position.

[0044] Step S11, determining the opening of the cabinet door according to the position of the cabinet door, and determining the area of ​​the opening of the experimental area according to the opening of the cabinet door.

[0045] Among them, after determining the position of the cabinet door, the current opening of the cabinet door can be determined, and the length of the opening of the experimental area is constant. Based on the known width (opening of the cabinet door), the area of ​​the opening of the experimental area can be determined. This area is the main factor affecting the exhaust volume.

[0046] Step S12, determining the target air extraction volume currently required for the fume hood according to the area of ​​the opening of the experimental area, and exhausting the fume hood according to the target air extraction volume.

[0047] Specifically, the opening area and the air extraction volume can be calibrated in advance to establish a mapping table between the opening area and the air extraction volume, wherein the air extraction volume corresponding to different opening areas can be obtained based on empirical values. For example, by performing a large amount of experimental data, the corresponding relationship between different opening areas and the air extraction volume can be found, so that after determining the opening area, the corresponding air extraction volume can be determined. Alternatively, it can be calculated by a model for a large amount of sample data. Exemplarily, the mapping table can be as shown in Table 1.

[0048] Table 1

[0049]

[0050] It can be seen from Table 1 that the inner width, that is, the opening length of the experimental area is 1410. When the face wind speed is 0.3, the air extraction volume of the opening of 100mm is 152m3 / hour, and the air extraction volume of the opening of 200mm is 304m3 / hour. After obtaining the opening area, the target air extraction volume corresponding to the opening area is searched in the preset mapping table, and the current fume hood is exhausted by the target air extraction volume. Specifically, the corresponding air extraction volume can be adjusted by adjusting the power of the exhaust equipment.

[0051] In addition, in some optional embodiments of the present invention, after the step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, the step further includes:

[0052] The temperature and humidity in the experimental area are obtained, an adjustment coefficient is determined according to the temperature and humidity, and the target air extraction volume is adjusted according to the adjustment coefficient to obtain a final target air extraction volume.

[0053] Specifically, in a specific experiment, the conditions required for each experiment are different, for example, the requirements for temperature and humidity, and humidity changes will affect the physical properties of the air (such as density), and in a high humidity environment, some substances may be more likely to condense or settle, and temperature affects the flow properties of the air. Therefore, it is necessary to appropriately adjust the exhaust volume to maintain this balance, wherein the temperature and humidity in the experimental area can be collected by arranging temperature and humidity sensors, and after collecting the temperature and humidity, the corresponding adjustment coefficient can be determined according to the pre-calibrated data, so as to adjust the target exhaust volume according to the adjustment coefficient to obtain the final target exhaust volume, and finally exhaust the fume hood according to the final target exhaust volume.

[0054] In summary, the method for controlling the exhaust volume of the experimental fume hood in the above embodiment of the present invention can determine the current opening area of ​​the fume hood by obtaining the door opening of the fume hood during the experiment, and then determine the target exhaust volume corresponding to the opening area, and exhaust the fume hood according to the target exhaust volume, thereby achieving corresponding exhaust processing for different door opening conditions. The problem of inaccurate exhaust control of the fume hood in the prior art is solved.

[0055] Embodiment 2

[0056] This embodiment also proposes a method for controlling the air extraction volume of an experimental fume hood. The difference between the method for controlling the air extraction volume of an experimental fume hood proposed in this embodiment and the method for controlling the air extraction volume of an experimental fume hood proposed in the first embodiment is that:

[0057] The step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises:

[0058] The cross-sectional area of ​​the arm portion of the experiment operator blocking the opening during the current experiment is obtained, the final opening area is determined according to the area of ​​the opening of the experimental area and the cross-sectional area, and the target air extraction volume is determined according to the final opening area.

[0059] Among them, since during the experiment, the experimental operator needs to put his hand into the experimental area to perform the experimental operation, the part of the experimental operator's arm blocking the opening will affect the air extraction volume and may cause the harmful gas to not be completely discharged. Therefore, in order to accurately control the air extraction volume, this factor is included in the reference of the air extraction volume adjustment. Specifically, the most direct impact of the arm blocking is to reduce the opening area. Therefore, it is necessary to obtain the cross-sectional area of ​​the arm part blocking the opening, so as to determine the final opening area based on the opening area and the cross-sectional area, and determine the target air extraction volume through the final opening area.

[0060] Specifically, in order to obtain the cross-sectional area, infrared detection arrays are relatively arranged at the bottom of the cabinet door, the bottom of the cabinet body, and both sides of the cabinet body, so as to form an infrared detection matrix, wherein the infrared detection array is composed of a plurality of infrared detection sensors. In practice, the number and position of the sensors on both sides to be opened can be determined according to the size of the opening. The bottom of the cabinet body is the side opposite to the bottom of the cabinet door, that is, the part close to the bottom of the experimental area. A preset coordinate system can be constructed with a preset point as the center, for example, the lower left corner of the cabinet body. After establishing the coordinate system, the distance information between the infrared detection array and the arm part can be obtained, and the distance information can be converted into coordinate information according to the preset coordinate system to obtain multiple contour points; then, the contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour, wherein, obtaining the area of ​​the shape enclosed by the contour points on the premise of knowing a plurality of contour points is known to those skilled in the art and will not be elaborated here.

[0061] In addition, in order to obtain a more accurate contour of the arm, more contour points need to be obtained. However, in fact, the number of contour points obtained is related to the density of the arranged infrared sensors. However, in practice, due to the limitations of hardware or layout space, the spacing of the infrared sensors cannot be absolutely close. In this case, in order to make the obtained contour more accurate, more virtual contour points can be generated between adjacent sensors through data interpolation methods, such as linear interpolation or high-order interpolation. In addition, the upper and lower infrared sensors can be staggered to ensure that the obtained contour points are not in a vertical plane, thereby covering more spatial information. Furthermore, the blocked part of the arm can be roughly regarded as an approximate symmetrical object, and the contour points of the arm part detected by the infrared detection array on one side of the cabinet can be used to determine the symmetry axis of the arm part at the opening, so that the contour points detected by the infrared detection array at the bottom of the cabinet door and the bottom of the cabinet can be mirrored to obtain multiple virtual contour points. Without increasing the hardware equipment, the number of contour points is increased to obtain a more accurate arm contour.

[0062] At the same time, since the arm is not completely symmetrical, but some parts will show certain local similarities. Therefore, in the embodiment of the present invention, the arm is made nearly symmetrical and mirrored. Therefore, in this case, the virtual contour points with obvious errors can be eliminated through the existing information, for example, judging whether the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet; if the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet, the virtual contour point is eliminated, thereby further improving the accuracy of the arm contour acquisition.

[0063] In summary, the method for controlling the exhaust volume of the experimental fume hood in the above embodiment of the present invention can determine the current opening area of ​​the fume hood by obtaining the door opening of the fume hood during the experiment, and then determine the target exhaust volume corresponding to the opening area, and exhaust the fume hood according to the target exhaust volume, thereby achieving corresponding exhaust processing for different door opening conditions. The problem of inaccurate exhaust control of the fume hood in the prior art is solved.

[0064] Embodiment 3

[0065] See also Figure 3 , shown is an air extraction control system of an experimental fume hood proposed in the third embodiment of the present invention, which is used to extract air from the experimental fume hood. The fume hood includes a cabinet body with an experimental area inside, and a cabinet door of the experimental area arranged in the cabinet body that can move up and down along the cabinet body to control the opening size of the experimental area. The back of the cabinet body is provided with an air extraction port, and the air extraction port is used to discharge the gas generated in the experimental area. The system includes:

[0066] A detection module, for controlling the cabinet door to move to a position that meets the current experimental requirements when detecting that an experiment needs to be started;

[0067] A determination module, used to determine the opening of the cabinet door according to the position of the cabinet door, and determine the area of ​​the opening of the experimental area according to the opening of the cabinet door;

[0068] The control module is used to determine the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, and to extract air from the fume hood according to the target air extraction volume.

[0069] Furthermore, in the above-mentioned exhaust volume control system of the fume hood, the step of determining the target exhaust volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises:

[0070] The cross-sectional area of ​​the arm portion of the experiment operator blocking the opening during the current experiment is obtained, the final opening area is determined according to the area of ​​the opening of the experimental area and the cross-sectional area, and the target air extraction volume is determined according to the final opening area.

[0071] Furthermore, in the above-mentioned exhaust volume control system of the fume hood, the bottom of the cabinet door, the bottom of the cabinet body and both sides of the cabinet body are relatively provided with infrared detection arrays, and the step of obtaining the cross-sectional area of ​​the arm portion of the experimental operator blocking the opening during the current experiment includes:

[0072] A preset coordinate system is constructed with the preset point as the center, the distance information between the infrared detection array and the arm part is obtained, and the distance information is converted into coordinate information according to the preset coordinate system to obtain a plurality of contour points;

[0073] The contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour.

[0074] Furthermore, in the above-mentioned exhaust volume control system of the fume hood, the infrared detection arrays at the bottom of the cabinet door and the bottom of the cabinet body are arranged in a staggered manner, and the contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour. The step includes:

[0075] Determine the symmetry axis of the arm portion at the opening according to the contour points of the arm portion detected by the infrared detection array on one side of the cabinet,

[0076] According to the symmetry axis, the contour points detected by the infrared detection array at the bottom of the cabinet door and the bottom of the cabinet are mirrored to obtain multiple virtual contour points, and the virtual contour points and contour points are fitted to obtain the contour of the arm part at the opening.

[0077] Furthermore, in the above-mentioned fume hood exhaust volume control system, the step of fitting the virtual contour points and contour points to obtain the contour of the arm part at the opening includes:

[0078] Determining whether the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet;

[0079] If the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet, the virtual contour point is removed.

[0080] Furthermore, in the above-mentioned exhaust volume control system of the fume hood, the step of determining the target exhaust volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises:

[0081] According to the area of ​​the opening of the experimental area, the target air extraction volume corresponding to the area of ​​the opening of the experimental area is searched in a preset mapping table.

[0082] Furthermore, in the above-mentioned exhaust volume control system of the fume hood, after the step of determining the target exhaust volume currently required by the fume hood according to the area of ​​the opening of the experimental area, the step further includes:

[0083] The temperature and humidity in the experimental area are obtained, an adjustment coefficient is determined according to the temperature and humidity, and the target air extraction volume is adjusted according to the adjustment coefficient to obtain a final target air extraction volume.

[0084] The functions or operation steps implemented when the above modules are executed are substantially the same as those in the above method embodiments, and will not be repeated here.

[0085] Embodiment 4

[0086] Another aspect of the present invention further provides a readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the steps of the method described in any one of the above embodiments 1 to 2 are implemented.

[0087] Embodiment 5

[0088] Another aspect of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in any one of the above-mentioned embodiments one to two when executing the program.

[0089] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0091] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0092] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for controlling the air extraction volume of a fume hood for an experiment, characterized in that: The method is used to extract air from a fume hood used for an experiment, wherein the fume hood includes a cabinet body with an experimental area provided therein, and a cabinet door provided in the cabinet body and movable up and down along the cabinet body, so as to control the opening size of the experimental area, and an air extraction port is provided on the back of the cabinet body, and the air extraction port is used to discharge the gas generated in the experimental area. The method includes: When it is detected that an experiment needs to be started, the cabinet door is controlled to move to a position that meets the current experimental requirements; Determining the opening of the cabinet door according to the position of the cabinet door, and determining the area of ​​the opening of the experimental area according to the opening of the cabinet door; The target air extraction volume currently required by the fume hood is determined according to the area of ​​the opening of the experimental area, and the fume hood is evacuated according to the target air extraction volume.

2. The method for controlling the air extraction volume of a fume hood for an experiment according to claim 1, characterized in that: The step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises: The cross-sectional area of ​​the arm portion of the experiment operator blocking the opening during the current experiment is obtained, the final opening area is determined according to the area of ​​the opening of the experimental area and the cross-sectional area, and the target air extraction volume is determined according to the final opening area.

3. The method for controlling the air extraction volume of a fume hood for an experiment according to claim 2, characterized in that: The bottom of the cabinet door, the bottom of the cabinet body and both sides of the cabinet body are relatively provided with infrared detection arrays, and the step of obtaining the cross-sectional area of ​​the arm portion of the experiment operator blocking the opening during the current experiment includes: A preset coordinate system is constructed with the preset point as the center, the distance information between the infrared detection array and the arm part is obtained, and the distance information is converted into coordinate information according to the preset coordinate system to obtain a plurality of contour points; The contour points are mapped to the preset coordinate system according to the coordinate information of the contour points, and the contour points are fitted to obtain the contour of the arm part at the opening, so as to determine the cross-sectional area of ​​the arm part at the opening according to the contour.

4. The method for controlling the air extraction volume of a fume hood for an experiment according to claim 3, characterized in that: The infrared detection arrays at the bottom of the cabinet door and the bottom of the cabinet body are arranged in a staggered manner, and the steps of mapping the contour points to the preset coordinate system according to the coordinate information of the contour points, fitting the contour points to obtain the contour of the arm part at the opening, and determining the cross-sectional area of ​​the arm part at the opening according to the contour include: Determine the symmetry axis of the arm portion at the opening according to the contour points of the arm portion detected by the infrared detection array on one side of the cabinet, According to the symmetry axis, the contour points detected by the infrared detection array at the bottom of the cabinet door and the bottom of the cabinet are mirrored to obtain multiple virtual contour points, and the virtual contour points and contour points are fitted to obtain the contour of the arm part at the opening.

5. The method for controlling the air extraction volume of a fume hood for an experiment according to claim 4, characterized in that: The step of fitting the virtual contour points and the contour points to obtain the contour of the arm part at the opening comprises: Determining whether the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet; If the virtual contour point exceeds the outermost contour point detected by the infrared detection array on one side of the cabinet, the virtual contour point is removed.

6. The method for controlling the air extraction volume of a fume hood for an experiment according to claim 1, characterized in that: The step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area comprises: According to the area of ​​the opening of the experimental area, the target air extraction volume corresponding to the area of ​​the opening of the experimental area is searched in a preset mapping table.

7. The method for controlling the exhaust volume of a fume hood for an experiment according to any one of claims 1 to 6, characterized in that: After the step of determining the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, the method further includes: The temperature and humidity in the experimental area are obtained, an adjustment coefficient is determined according to the temperature and humidity, and the target air extraction volume is adjusted according to the adjustment coefficient to obtain a final target air extraction volume.

8. An air extraction control system for a fume hood for an experiment, characterized in that: Used to extract air from a fume hood used for an experiment, the fume hood includes a cabinet body with an experimental area inside, and a cabinet door of the experimental area arranged in the cabinet body that can move up and down along the cabinet body to control the opening size of the experimental area, and an air extraction port is arranged on the back of the cabinet body, and the air extraction port is used to discharge the gas generated in the experimental area. The system includes: A detection module, for controlling the cabinet door to move to a position that meets the current experimental requirements when detecting that an experiment needs to be started; A determination module, used to determine the opening of the cabinet door according to the position of the cabinet door, and determine the area of ​​the opening of the experimental area according to the opening of the cabinet door; The control module is used to determine the target air extraction volume currently required by the fume hood according to the area of ​​the opening of the experimental area, and to extract air from the fume hood according to the target air extraction volume.

9. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the methods of claims 1 to 7 when executing the program.

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