Laboratory air safety purification system

Abstract

The invention discloses a laboratory air safety purification system, and relates to the technical field of air purification. Air in a laboratory is inspected in real time, and the flow velocity and the flow direction of the air in the laboratory are monitored in real time; then the poison gas monitor is driven by the inspection robot to timely monitor the poison gas in the laboratory in real time, then the volatile source of the volatile poison gas is roughly positioned according to analysis and processing of monitored data, timely processing by workers is facilitated, and meanwhile, according to the positioned volatile source of the volatile gas, the poison gas in the laboratory can be timely monitored. According to the method, the toxic gas volatilization area is analyzed according to the toxic gas type and the air velocity and flowing direction in the laboratory, and the toxic gas in the volatilization area is directionally absorbed and purified, so that the volatile toxic gas is prevented from entering other areas of the laboratory to pollute the other areas, and the purification effect of the laboratory air is further improved; and meanwhile, the power of the exhaust fan in the air suction purification process is controlled in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of air purification, and specifically relates to a laboratory air safety purification system. Background Art

[0002] In a chemical laboratory, multiple experiment tables are usually placed in the laboratory, and an exhaust fan is set on each experiment table. The exhaust fan timely exhausts and purifies the gas generated during the experiment. Usually, some chemical reagents are placed on the chemical experiment table, and some toxic chemical reagents may leak from the reagent box and volatilize into the laboratory. Usually, during the experiment, the exhaust fan on the experiment table is turned on for exhaust and purification to prevent the volatilized poisonous gas from harming the experimenters.

[0003] However, when the laboratory is not in use, the exhaust fans in the laboratory are turned off. At this time, when some poisonous gases leak from the experiment table, they cannot be monitored in time, nor can they be exhausted and purified. The poisonous gases will volatilize in the laboratory, resulting in air pollution in the laboratory. When the experimenters enter the laboratory for chemical experiments, the volatilized poisonous gases in the laboratory will pose some safety hazards to the experimenters, and at the same time cause a large amount of volatilization of the experimental reagents, resulting in waste of the reagents.

[0004] To solve the above problems, the present invention proposes a solution. Summary of the Invention

[0005] The present invention aims to solve the problems raised in the above background art; for this purpose, the present invention proposes a laboratory air safety purification system, including:

[0006] Information acquisition terminal: A gas detector is carried by an inspection robot to collect the gas concentration information in the laboratory, and a plane coordinate system is established with the starting point of the robot as the origin to record the position information. The position information specifically includes the coordinates during the movement of the inspection robot carrying the gas detector. At the same time, the air velocity and air flow direction in the laboratory are monitored in real time through a number of wind direction sensors, and the specific flow direction of the monitored air in the coordinate system is determined in combination with the plane coordinate system;

[0007] Data processing terminal: Based on the gas concentration, coordinate points, flow velocity and flow direction, calculate the approximate position of the gas volatilization source, determine the maximum volatilization radius according to the time interval Ti between two detections, and determine the gas diffusion area in combination with the air flow velocity and flow direction.

[0008] Preferably, the specific acquisition method of the information acquisition terminal is:

[0009] An inspection robot carries a gas detector and records the concentration Ci of different poisons Dq at each coordinate point Ai;

[0010] A wind direction sensor is arranged in the laboratory to monitor the air velocity V and the angle θ between the flow direction and the X-axis of the coordinate system in real time.

[0011] Preferably, the specific method for the data processing end to determine the approximate position of the poison gas volatilization source is as follows:

[0012] When the poison gas concentration exceeds the preset value, the average velocity Vi within the time interval Ti when the inspection robot passes through this point twice is obtained;

[0013] If the air velocity Vi < V1, where V1 is a preset value, at this time the influence of the air velocity on the volatilization of the poison gas is small, and the concentration distribution is expressed as approximately symmetric with the volatilization source as the center;

[0014] Subsequently, the approximate coordinates of the poison gas volatilization source are calculated by weighted average of the coordinate points and the poison gas concentration:

[0015] For example, the abscissa Xd coordinate of the poison gas volatilization position is:

[0016]

[0017] For example, the ordinate Yd coordinate of the poison gas volatilization position is:

[0018]

[0019] According to the above calculation method, the approximate position (Xd, Yd) of the poison gas volatilization source is calculated. At this time, an abnormal signal is generated, and the position of the volatilization source is represented.

[0020] Preferably, when the air velocity Vi ≥ V1, the specific method for calculating the poison gas volatilization source is as follows:

[0021] According to the angle θ between the acquisition end and the positive direction of the X-axis of the coordinate system obtained by the acquisition end, the air flow influence factor f at each coordinate point position is calculated i , f i = e -αdi , where α is a constant related to the wind speed and gas characteristics, which is a preset value set by the administrator according to experience, and di represents the projection of the distance from the detection position to the coordinate position of the volatilization source without considering the air flow factor in the air flow direction, di = (Xd - xi)cosθ + (Yd - yi)sinθ;

[0022] According to the above air flow influence factor, the concentration data is corrected to obtain Ci′ = Ci × fi. Subsequently, according to the above weighted average method, the approximate coordinates (X′d, Y′d) of the poison gas volatilization source under the influence of air flow are calculated, and then an abnormal signal is generated.

[0023] Preferably, it further includes an air purification control terminal. The air purification control terminal analyzes the specific area where poisonous gas volatilizes based on the data processing terminal, and conducts directional absorption and purification on the volatilized poisonous gas. The specific method is as follows:

[0024] When the air velocity Vi < V1, calculate the maximum approximate radius r1i of the poisonous gas volatilization: r1i = TixRxK Dq where R is a preset value, and K Dq is the diffusion coefficient of different types of poisonous gases, which is a preset value. Then, draw a circle with the poisonous gas volatilization source as the center and r1i as the radius. Subsequently, start the exhaust fan on the experimental bench within the covered area of this circle.

[0025] Preferably, when Vi ≥ V1, according to the air velocity Vi of the poisonous gas volatilization source collected and the interval time Ti between two monitors, calculate the maximum distance r2i of the poisonous gas volatilization under the influence of the air velocity: r2i = TixRxK Dq xpVi,p is the weight coefficient;

[0026] Establish a straight line Li passing through the volatilization source and perpendicular to the wind direction. Take a semi-circular area in the positive wind direction of the circle with r2i as the radius and the volatilization source as the center as the purification area, and start the exhaust fan within the covered range of this semi-circular area.

[0027] Preferably, it further includes a purification equipment management terminal. The purification equipment management terminal adjusts the power of the exhaust fan within the air purification range according to the concentration within the gas volatilization range. The specific method is as follows:

[0028] When the air velocity Vi < V1, control the inspection robot to move from the edge of the maximum diffusion radius r1i of the poisonous gas towards the center of the volatilization source, and monitor the concentration Cj of the poisonous gas on the moving path in real time:

[0029] When the gas concentration Cj < Cx within the moving range, Cx is a preset value. At this time, obtain the straight-line distance Lj of the movement. Then, draw a circular ring with the straight-line distance Lj around the poisonous gas volatilization source as the center, and turn off the exhaust fan within this area;

[0030] When the concentration within the moving range is Cx ≤ Cj < Cx1, at this time, adjust the power of the exhaust fan within this area to W1, where Cx1 and W1 are preset values;

[0031] When the concentration within the moving range is Cj ≥ Cx1, at this time, adjust the power of the exhaust fan within this area to W2, where W2 is a preset value.

[0032] Preferably, when Vi≥V1, control the inspection robot to move along the wind direction to the edge of the maximum diffusion radius r2 i, move from the edge towards the volatile source and monitor the gas concentration Cj in real time. Subsequently, adopt the same concentration grading control strategy as when Vi<V1 to perform real-time control of the power of the exhaust fans within the volatile range.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: By performing real-time inspections on the air in the laboratory and monitoring the air flow rate and direction in the laboratory in real time, and then driving the gas monitor by the inspection robot to timely monitor the toxic gases in the laboratory in real time. Subsequently, based on the analysis and processing of the monitored data, roughly locate the volatile sources of the volatile toxic gases, which is convenient for the staff to handle in a timely manner;

[0034] At the same time, based on the located volatile sources of the volatile gases, as well as the types of toxic gases, the air flow rate and direction in the laboratory, analyze the areas where the toxic gases volatilize, and perform directional absorption and purification of the toxic gases in the volatile areas to prevent the volatilized toxic gases from entering other areas of the laboratory, resulting in pollution in other areas, further improving the purification effect of the laboratory air. At the same time, perform real-time control of the power during the air suction and purification process of the exhaust fans, further reducing the energy consumption of the air purification in the laboratory.

[0035] By performing real-time power control on the exhaust fans in the volatile gas area based on the concentration volatilized in the volatile gas area, effectively discharge and purify the volatile toxic gases, while also reducing the exhaust air purification energy consumption and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the principle framework of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figure 1 , this application provides a laboratory air safety purification system, including:

[0040] Information acquisition end: The patrol robot drives the gas monitor to move around in the laboratory, and a plane coordinate system is established with the starting point of the patrol robot as the origin. Combining with the plane coordinate system, the moving coordinates of the patrol robot driving the gas monitor can be located. The patrol robot drives the gas monitor to monitor the concentrations of different types of poisonous gases Dq, and collects the gas concentrations Ci corresponding to several coordinate points Ai(xi, yi) of the poisonous gas Dq. At the same time, several wind direction sensors are installed in the laboratory. The wind direction sensors are used to monitor the air flow velocity V in the laboratory in real time, and the angle θ between the flow direction and the positive direction of the coordinate system X;

[0041] Data processing end: When it is detected that a certain poisonous gas leaks in the laboratory, the gas concentrations corresponding to different coordinate points are collected according to the data collected by the data acquisition end; when the gas monitor detects that the gas concentration at this point exceeds the predetermined value, the air flow velocity Vi within the time period Ti from the last time the patrol robot passed this point to the current time passing this point is obtained at this time. When the air flow velocity Vi < V1, where V1 is a preset value set by the administrator, the influence of the air flow velocity on the gas volatilization is small at this time, and the concentration distribution is expressed as approximately symmetric with the volatilization source as the center;

[0042] Subsequently, the approximate coordinates of the gas volatilization source are calculated by weighted average according to the coordinate points and the gas concentrations:

[0043] For example, the abscissa Xd coordinate of the gas volatilization position is:

[0044]

[0045] For example, the ordinate Yd coordinate of the gas volatilization position is:

[0046]

[0047] According to the above calculation method, the approximate position (Xd, Yd) of the gas volatilization source is calculated. At this time, an abnormal signal is generated, and the position of the volatilization source is represented;

[0048] For example, the patrol robot in the information acquisition end drives the gas monitor to detect a gas leak. At this time, the gas concentrations corresponding to three coordinate positions are C1 = 40 ppm at position A1(2, 2), C1 = 50 ppm at position A2(3, 2), and C1 = 60 ppm at position A3(5, 2).

[0049] At this time, substitute into the above formula: Thus, the coordinate position of the gas volatilization source is obtained as (3.53, 2);

[0050] When the air flow velocity Vi ≥ V1, it is necessary to consider the influence of air flow on the volatilization of poisonous gas. At this time, according to the angle θ between the flow direction obtained by the acquisition end and the positive direction of the coordinate system X,

[0051] First, calculate the air flow influence factor f at each coordinate point position i , f i = e -αdi , where α is a constant related to the wind speed and gas characteristics, which is a preset value set by the administrator according to experience. di represents the projection of the distance from the detection position to the coordinate (Xd, Yd) of the poisonous gas volatilization source without considering the air flow factor in the air flow direction, and di = (Xd - xi)cosθ + (Yd - yi)sinθ;

[0052] According to the above air flow influence factor, correct the concentration data to obtain Ci′ = Ci × fi,

[0053] Subsequently, according to the above calculation method and the corrected concentration data, calculate the approximate coordinates (X′d, Y′d) of the poisonous gas volatilization source under the influence of air flow, then generate an abnormal signal, and represent the poisonous gas volatilization source.

[0054] By conducting real-time inspections on the air in the laboratory and real-time monitoring of the air flow velocity and direction in the laboratory, then driving the poisonous gas monitor by the inspection robot to conduct real-time monitoring of the poisonous gas in the laboratory, timely capture some volatile poisonous gases, and at the same time timely estimate the position of the volatilization source, which is convenient for the staff to timely process the drugs at the volatilization source, further improving the monitoring of the air safety in the laboratory, and at the same time timely treatment also reduces the waste of drugs.

[0055] Example Two

[0056] Compared with Example One, this example provides an air purification control end based on the information acquisition end and the data processing end. According to the approximate position of the poisonous gas volatilization source, the volatilized poisonous gas is directionally absorbed and purified. The specific method is as follows:

[0057] When the air flow velocity Vi < V1, at this time, it will volatilize radially with the poisonous gas volatilization source as the center. Subsequently, according to the interval time period Ti between the time when the leakage at this point is found during the inspection of the inspection robot and the last time it passed this point, calculate the maximum approximate radius r1 i = TixRxK Dq where R is a preset value set by the administrator, K DqThe diffusion coefficient of different types of poisonous gases is a preset value set by the administrator. Subsequently, a circle is drawn with the poisonous gas volatilization source as the center and r1i as the radius. Then, the exhaust fans on the experimental bench within the covered area of the circle are started. The exhaust fans directionally absorb and purify the poisonous gas within the maximum volatilization range of the poisonous gas, so that during the inhalation and purification process of the poisonous gas, the poisonous gas is only absorbed and purified within the maximum volatilization area, and some poisonous gas will not enter other areas of the laboratory through the air flow due to the absorption of the poisonous gas, causing pollution in other areas.

[0058] When Vi≥V1, the volatilization of the poisonous gas will be affected by the air flow in the laboratory at this time. At this time, the volatilization area of the poisonous gas is analyzed according to the air flow direction and velocity collected by the data acquisition end at the poisonous gas volatilization source. The specific method is as follows:

[0059] According to the air flow velocity Vi of the poisonous gas volatilization source collected and the interval time Ti between two monitors, calculate the maximum distance r2i of the poisonous gas volatilization under the influence of the air flow velocity, r2i = TixRxK Dq xpVi,p is the weight coefficient set by the administrator. Subsequently, according to the collected air flow direction of the poisonous gas source, a straight line Li passing through the coordinate point of the poisonous gas source is established. The straight line Li is perpendicular to the reverse direction of the air flow. Then, a circle is drawn with r2i as the radius, and the semi-circle formed by the straight line Li and the circle in the air flow direction is marked as the poisonous gas volatilization area. Then, the exhaust fans covered within the poisonous gas volatilization area are started to directionally absorb and purify the poisonous gas within the volatilization area, so that the volatilized poisonous gas is fully absorbed within the volatilization area.

[0060] During the volatilization process of the poisonous gas, under different air flow conditions, calculate the maximum range of the poisonous gas volatilized from the volatilization source, and combine the positions of the exhaust fans on the experimental bench in the laboratory coordinate system to reasonably start and stop the exhaust fans in the volatilization area. The volatilized toxic gas is directionally discharged and purified from the volatilization area, and it will not cause the toxic gas to flow outside the volatilization area during the air purification process, resulting in a larger area of poisonous gas pollution in the laboratory, further improving the purification effect of the toxic gas in the laboratory.

[0061] Example Three

[0062] Compared with Example Two, this example provides a purification equipment management terminal: adjust the power of the exhaust fans within the air purification range according to the concentration range of the gas volatilization. The specific method is as follows:

[0063] When the exhaust fan in the volatile area of the laboratory is exhausting air, since the volatile source cannot be processed in time at this time, it is necessary to continuously exhaust and purify the poisonous gas in the volatile area. According to the maximum volatile radius calculated in the second embodiment, then the inspection robot at the data acquisition end moves to the edge of the maximum volatile radius, and drives the poisonous gas monitor to move towards the position of the volatile source to perform real-time monitoring of the poisonous gas concentration;

[0064] When the air velocity Vi < V1, at this time, when radioactive volatilization occurs with the poisonous gas volatile source as the center, at this time, the inspection robot drives the poisonous gas monitor to move to the edge of the maximum radius of poisonous gas volatilization, and slowly moves from the edge of the maximum radius towards the volatile source. While moving, the concentration of the gas is monitored, and the operating power of the exhaust fan is controlled in real time according to the monitored concentration. The specific method is as follows:

[0065] When the inspection robot drives the gas instrument to move from the edge of the maximum radius r1 i to the center of the volatile source, and the gas concentration Cj < Cx within the moving range, Cx is a preset value set by the administrator. At this time, the straight-line distance Lj of the movement is obtained. At this time, the straight-line distance Lj is used to draw a circular ring with the poisonous gas volatile source as the center, and this area is marked. Subsequently, the exhaust fan within this area is turned off;

[0066] When the concentration within the moving range is Cx ≤ Cj < Cx1, at this time, the exhaust fan within this area is adjusted to a power of W1, Cx1 and W1 are preset values set by the administrator;

[0067] When the concentration within the moving range is Cj ≥ Cx1, at this time, the exhaust fan within this area is adjusted to a power of W2, W2 is a preset value set by the administrator;

[0068] When the inspection robot slowly moves from the edge of the maximum radius towards the volatile source for one cycle, and then moves in the reverse direction, and drives the poisonous gas monitor to perform real-time monitoring, thereby controlling the power of the exhaust fan within the diffusion range in real time, reducing the energy consumption of exhaust purification. At the same time, according to the volatile concentration, the power of the exhaust fan is adjusted in real time, further improving the purification effect of the poisonous gas.

[0069] When Vi ≥ V1, at this time, the inspection robot drives the poisonous gas monitor to move along the wind direction to the edge of the maximum radius of poisonous gas volatilization, and slowly moves from the edge of the maximum radius towards the volatile source. While moving, the concentration of the gas is monitored. Subsequently, the power of the exhaust fan within the volatile range is controlled in real time according to the same method above. Through the concentration of volatilization within the poisonous gas volatile area, the power of the exhaust fan within the volatile area is controlled in real time, realizing the effective emission and purification of the volatile poisonous gas, while also reducing the energy consumption of exhaust purification and saving resources.

[0070] Some of the data in the above formula are numerically calculated after removing their dimensions, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A laboratory air safety purification system, characterized in that, Including: Information collection end: A gas detector is carried by a patrol robot to collect the gas concentration information in the laboratory, and a plane coordinate system is established with the starting point of the robot as the origin to record the position information. The position information specifically includes the coordinates during the movement of the patrol robot carrying the gas detector. At the same time, the air velocity and air flow direction in the laboratory are monitored in real time through several wind direction sensors, and the specific flow direction of the monitored air in the coordinate system is determined in combination with the plane coordinate system. Data processing end: Based on the gas concentration, coordinate points, air velocity, and flow direction in the laboratory obtained by the information collection end, the approximate position of the gas volatilization source is calculated by the weighted average method based on the above-obtained data. And according to the time interval Ti between two detections, combined with the diffusion coefficient of the gas, the maximum volatilization radius and diffusion area are determined.

2. The laboratory air safety purification system according to claim 1, wherein, The specific collection method of the information collection end is: A patrol robot carries a gas detector and records the concentration Ci of different poisons Dq at each coordinate point Ai. Wind direction sensors are arranged in the laboratory to monitor the air velocity V and the angle θ between the flow direction and the X-axis of the coordinate system in real time.

3. The laboratory air safety purification system according to claim 2, wherein, The specific method for the data processing end to determine the approximate position of the gas volatilization source is: When the gas concentration exceeds the preset value, the average velocity Vi within the time interval Ti when the patrol robot passes through this point twice is obtained. If the air velocity Vi < V1, where V1 is the preset value, the concentration distribution is expressed as approximately symmetric with the volatilization source as the center. Subsequently, the approximate coordinates of the gas volatilization source are calculated by the weighted average method based on the coordinate points and gas concentration: For example, the abscissa Xd coordinate of the gas volatilization position is: For example, the ordinate Yd coordinate of the gas volatilization position is: The approximate position (Xd, Yd) of the gas volatilization source is calculated according to the above calculation method. At this time, an abnormal signal is generated, and the position of the volatilization source is represented.

4. A laboratory air safety purification system according to claim 3, wherein When the air velocity Vi ≥ V1, the specific calculation method of the gas volatilization source is: According to the angle θ between the flow direction obtained by the acquisition end and the positive direction of the coordinate system X, calculate the air flow influence factor f at the position of each coordinate point i , f i = e -αdi , where α is a constant related to the wind speed and gas characteristics, which is a preset value set by the administrator according to experience. di represents the projection of the distance from the detection position to the coordinate position of the volatile source without considering the air flow factor in the air flow direction. di = (Xd - xi)cosθ + (Yd - yi)sinθ; The concentration data is corrected according to the above air flow influence factor to obtain Ci′ = Ci × fi. Subsequently, the approximate coordinates (X′d, Y′d) of the gas volatilization source under the influence of air flow are calculated by the above weighted average method, and then an abnormal signal is generated.

5. The laboratory air safety purification system according to claim 4, characterized in that, It further includes an air purification control end. The air purification control end analyzes the specific area of gas volatilization based on the data processing end and conducts directional absorption and purification of the volatilized gas. The specific method is: When the air flow velocity Vi < V1, the maximum approximate radius r1i of the toxic gas volatilization is calculated as r1i = TixRxK Dq where R is a preset value, and K Dq is the diffusion coefficient of different types of toxic gases, which is a preset value. Subsequently, a circle is drawn with the toxic gas volatilization source as the center and r1i as the radius. Then, the exhaust fan on the experimental table within the covered area of the circle is started.

6. The laboratory air safety purification system according to claim 5, characterized in that, When Vi ≥ V1, based on the air velocity Vi of the gas volatilization source collected and the interval time Ti between two monitorings, calculate the maximum distance r2i of gas volatilization under the influence of the air velocity, where r2i = Ti x RxK Dq xpVi, where p is the weight coefficient; A straight line Li passing through the volatilization source and perpendicular to the wind direction is established. A circle is drawn with the volatilization source as the center and r2i as the radius. The semi-circular area in the positive wind direction of the circle is taken as the purification area, and the exhaust fans within the coverage of this semi-circular area are started.

7. A laboratory air safety purification system according to claim 1, characterized in that, It further includes a purification equipment management end. The purification equipment management end adjusts the power of the exhaust fans within the air purification range according to the concentration within the gas volatilization range. The specific method is: When the air velocity Vi < V1, the patrol robot is controlled to move from the edge of the maximum gas diffusion radius r1i towards the center of the volatilization source to monitor the gas concentration Cj on the moving path in real time. When the gas concentration Cj monitored within the moving range is less than Cx, where Cx is a preset value, the straight-line distance Lj of the movement is obtained at this time. Then, a circular ring is drawn with the straight-line distance Lj around the poison gas volatilization source as the center, and the exhaust fans within this area are turned off. When the concentration within the moving range is Cx ≤ Cj < Cx1, the exhaust fans within this area are adjusted to a power of W1 at this time, where Cx1 and W1 are preset values. When the concentration within the moving range is Cj ≥ Cx1, the exhaust fans within this area are adjusted to a power of W2 at this time, where W2 is a preset value.

8. A laboratory air safety purification system according to claim 7, characterized in that, When Vi ≥ V1, the inspection robot is controlled to move along the wind direction to the edge of the maximum diffusion radius r2i, move from the edge towards the volatilization source and monitor the poison gas concentration Cj in real time. Subsequently, the same concentration classification control strategy as when Vi < V1 is adopted to perform real-time control of the power of the exhaust fans within the volatilization range.

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