A gas collection device and method

Abstract

The present application discloses a gas collection device and method, including a gas collection chamber, a concentration detection module, an air inlet channel, a negative pressure channel, a fan, a pressure detection module and a control module. Among them, the concentration detection module is arranged in the gas collection chamber and is used to detect the gas concentration. The air inlet channel is communicated with the gas collection chamber through the negative pressure channel, and the negative pressure channel is used to adjust the gas flow rate. The fan is arranged in the air inlet channel; the pressure detection module is used to detect the pressure of the gas entering the negative pressure channel; the control module is connected to the pressure detection module and the concentration detection module. The control module is used to control the fan according to the data feedback of the pressure detection module, and the control module is used to issue an alarm according to the concentration of harmful gases detected by the concentration detection module. The above gas collection device can detect the concentration of harmful gases in the air in real time and accurately, which is beneficial to making timely reminders, thereby avoiding threatening people's lives and property safety.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and particularly relates to a gas collection device, and the present application also relates to a gas collection method applied to the gas collection device. Background Art

[0002] Currently, most of the methods for detecting harmful gases in households or industries are to detect the presence of harmful gases when the harmful gases naturally volatilize to the detection position. Such a collection method has low efficiency, cannot perform the function of rapid alarm, and sometimes there will be a situation where the collection of harmful gases cannot be achieved due to channel blockage, and the concentration of the collected harmful gases is higher than the true concentration of the harmful gases, ultimately resulting in the inability to accurately detect the concentration of harmful gases, thereby threatening people's lives and property safety.

[0003] Therefore, how to avoid the inability to detect the concentration of harmful gases in real time and accurately is a technical problem that those skilled in the art need to solve at present. Summary of the Invention

[0004] The purpose of the present application is to provide a gas collection device and method, which can detect the concentration of harmful gases in real time and accurately, is conducive to making timely reminders, and thus avoids threatening people's lives and property safety.

[0005] To achieve the above purpose, the present application provides a gas collection device, including:

[0006] A gas collection chamber;

[0007] A concentration detection module, arranged in the gas collection chamber, for detecting the gas concentration;

[0008] An air inlet channel, communicated with the gas collection chamber through a negative pressure channel, and the negative pressure channel is used to adjust the flow rate of the gas;

[0009] A fan, arranged in the air inlet channel, for providing power to enable the gas to enter the gas collection chamber;

[0010] A pressure detection module, arranged at one end of the negative pressure channel close to the air inlet channel, for detecting the pressure of the gas entering the negative pressure channel;

[0011] A control module, connected to the pressure detection module and the concentration detection module, for controlling the fan according to the data feedback of the pressure detection module, and for issuing an alarm according to the concentration of harmful gases detected by the concentration detection module.

[0012] In some embodiments, it further includes a dust-proof filter plate. There is a replacement port in the air inlet channel, and the dust-proof filter plate is detachably connected to the replacement port, and the gas entering the air inlet channel enters the negative pressure channel through the dust-proof filter plate.

[0013] In some embodiments, the gas collection chamber is provided with a drawer-type structure, and the concentration detection module and the control module are installed in the drawer-type structure.

[0014] In some embodiments, an arch-shaped gas path is provided in the negative pressure channel.

[0015] In some embodiments, partitions are provided at intervals in the vertical direction in the negative pressure channel to form an arch-shaped gas path.

[0016] In some embodiments, it further includes:

[0017] A first air outlet channel, which is communicated with the gas collection chamber and separated from the negative pressure channel;

[0018] A second air outlet channel, which is communicated with the first air outlet channel and the air inlet channel, and is used for the gas in the first air outlet channel and the air inlet channel to flow out.

[0019] In some embodiments, it further includes a deflector plate, which is arranged in the second air outlet channel, and the gas in the first air outlet channel and the air inlet channel flows out from the outlet of the second air outlet channel after being deflected by the deflector plate.

[0020] In some embodiments, one or more of a temperature and humidity sensor, a VOC sensor, and a combustible gas sensor are further provided in the gas collection chamber.

[0021] The present application provides a gas collection method, which is applied to the gas collection device of any one of the above, and includes:

[0022] Control the fan to start;

[0023] Obtain the gas pressure entering the negative pressure channel, and perform closed-loop control on the fan according to the gas pressure;

[0024] Obtain the concentration of harmful gas entering the gas collection chamber, and give an alarm according to the concentration of harmful gas.

[0025] In some embodiments, the step of obtaining the gas pressure entering the negative pressure channel and performing closed-loop control on the fan according to the gas pressure includes:

[0026] Obtain the gas pressure e|n - 2| entering the negative pressure channel at time t 1 , the gas pressure e|n - 1| entering the negative pressure channel at time t 2 and the gas pressure e|n| entering the negative pressure channel at time t 3 , where t 1 < t 2 < t 3 ;

[0027] The motor control quantity of the fan is calculated according to Δu|n| = Kp*{e|n| - e|n - 1|} + Ki*e|n| + Kd*{e|n| - 2e|n - 1| + e|n - 2|}, and the fan is closed-loop controlled according to the motor control quantity, where Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and Δu|n| is the motor control quantity that should be changed for the previous moment at the current moment.

[0028] Compared with the above background technology, the gas collection device provided by the embodiments of the present application includes a gas collection chamber, a concentration detection module, an air inlet channel, a negative pressure channel, a fan, a pressure detection module, and a control module. Among them, the concentration detection module is arranged in the gas collection chamber, and the concentration detection module is used to detect the concentration of harmful gases. The air inlet channel is communicated with the gas collection chamber through the negative pressure channel. After the gas enters the air inlet channel, the flow rate of the gas is adjusted through the negative pressure channel, so that the gas slowly flows into the gas collection chamber to reduce the pressure impact caused by the fan, thereby ensuring that the air pressure in the gas collection chamber is close to the air pressure outside and the air flow rate is relatively slow, and solving the problem that the concentration detection module detects that the concentration of harmful gases is higher than the actual concentration in the air due to too fast wind speed; the fan is arranged in the air inlet channel, and the fan is used to provide negative pressure power to make the gas enter the gas collection chamber; the pressure detection module is arranged at one end of the negative pressure channel close to the air inlet channel, and the pressure detection module is used to detect the pressure of the gas entering the negative pressure channel; the control module is connected to the pressure detection module and the concentration detection module, and the control module is used to control the fan according to the data feedback of the pressure detection module, and the control module is used to issue an alarm according to the concentration of harmful gases detected by the concentration detection module. At the same time, the present application also provides a gas collection method, which includes: first, controlling the fan to start, then, obtaining the gas pressure entering the negative pressure channel, and performing closed-loop control on the fan according to the gas pressure, and finally, obtaining the concentration of harmful gases entering the gas collection chamber, and issuing an alarm according to the concentration of harmful gases.

[0029] Specifically, after the device is started, the fan is controlled to provide negative pressure power to make the gas outside the air inlet channel (a mixed gas of harmful gas and air) enter the air inlet channel; then, the pressure of the gas entering the negative pressure channel is detected by the pressure detection module, and the detected data is transmitted to the control module, and the fan is closed-loop controlled by the control module, so that there is a constant gas passing through the gas collection chamber for the concentration detection module to collect data, which is beneficial to improving the sensitivity of the concentration detection module; after the gas enters the gas collection chamber, the concentration of harmful gases is detected by the concentration detection module, and the control module issues an alarm according to the concentration of harmful gases detected by the concentration detection module.

[0030] It can be understood that the control module can perform closed-loop control on the fan according to the data feedback of the air pressure detection module, so that a constant gas actively enters the gas collection chamber at an appropriate speed, enabling the concentration detection module to quickly collect and detect harmful gases, which is beneficial to improving the sensitivity of the concentration detection module. At the same time, the control module can also detect the concentration of harmful gases according to the data of the concentration detection module and issue an alarm. In this way, the gas collection device and gas collection method provided by the embodiments of the present application can detect the concentration of harmful gases in the air in real time and accurately, which is beneficial to making timely reminders and thus avoiding threats to people's lives and property safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0032] Figure 1 is an exploded view of the gas collection device in the embodiment of the present application;

[0033] Figure 2 is an overall schematic diagram of the gas collection device in the embodiment of the present application.

[0034] Wherein:

[0035] 1 - fan, 2 - dust-proof filter plate, 3 - air pressure detection module, 4 - air inlet channel, 5 - replacement port, 6 - negative pressure channel, 7 - bow-shaped gas path, 8 - partition board, 9 - gas collection chamber, 10 - drawer-type structure, 11 - concentration detection module, 12 - control module, 13 - first air outlet channel, 14 - second air outlet channel, 15 - guide plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0037] In order to enable those skilled in the art of the present technology to better understand the solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0038] It should be noted that the orientation terms such as "upper end, lower end, left side, right side" described below are defined based on the drawings of the specification.

[0039] Please refer to Figure 1 and Figure 2 , Figure 1 which is the explosion diagram of the gas collection device in the embodiment of the present application; Figure 2 which is the overall schematic diagram of the gas collection device in the embodiment of the present application.

[0040] The gas collection device provided by the embodiment of the present application includes a gas collection chamber 9, a concentration detection module 11, an air inlet passage 4, a negative pressure passage 6, a fan 1, a pressure detection module 3, and a control module 12. Among them, the concentration detection module 11 is arranged in the gas collection chamber 9. The concentration detection module 11 is used to detect the concentration of harmful gases and output the concentration of harmful gases through a data line interface. The detected gas is discharged through an air outlet passage connected to the gas collection chamber 9; the air inlet passage 4 is communicated with the gas collection chamber 9 through the negative pressure passage 6. After the gas enters the air inlet passage 4, the flow rate of the gas is adjusted through the negative pressure passage 6, so that the gas slowly flows into the gas collection chamber 9 to reduce the pressure influence brought by the fan 1, so as to ensure that the air pressure in the gas collection chamber 9 is close to the air pressure outside and the air flow rate is relatively slow, and solve the problem that the concentration detection module 11 detects that the concentration of harmful gases is higher than the actual concentration in the air due to too fast wind speed; the fan 1 is arranged in the air inlet passage 4, and the fan 1 is used to provide negative pressure power to make the gas enter the gas collection chamber 9.

[0041] In addition, the pressure detection module 3 is arranged at one end of the negative pressure passage 6 close to the air inlet passage 4. The pressure detection module 3 is used to detect the pressure of the gas entering the negative pressure passage 6; the control module 12 is connected to the pressure detection module 3 and the concentration detection module 11. The control module 12 is used to control the fan 1 according to the data feedback of the pressure detection module 3, and the control module 12 is used to give an alarm according to the concentration of harmful gases detected by the concentration detection module 11.

[0042] Among them, the fan 1 includes a motor and an impeller assembly. The impeller assembly is installed at the output end of the motor. After the motor is powered on, it drives the impeller assembly to rotate. After the blades of the impeller assembly rotate, a negative pressure is formed, so as to suck external gas into the air inlet passage 4.

[0043] In this way, after the device is started, the control fan 1 provides negative pressure power to enable the gas outside the air inlet passage 4 (a mixed gas of harmful gas and air) to enter the air inlet passage 4; then, the pressure of the gas entering the negative pressure passage 6 is detected by the air pressure detection module 3, and the detected data is transmitted to the control module 12, and the control module 12 performs closed-loop control on the fan 1, so that a constant gas can pass through the gas collection chamber 9 and be used by the concentration detection module 11 for data collection, which is beneficial to improving the sensitivity of the concentration detection module 11; after the gas enters the gas collection chamber 9, the concentration of the harmful gas is detected by the concentration detection module 11, and the control module 12 issues an alarm according to the concentration of the harmful gas detected by the concentration detection module 11.

[0044] It can be understood that the control module 12 can perform closed-loop control on the fan 1 according to the data feedback of the air pressure detection module 3, so that a constant gas actively enters the gas collection chamber 9 at a suitable speed, enabling the concentration detection module 11 to quickly collect and detect the harmful gas, which is beneficial to improving the sensitivity of the concentration detection module 11; at the same time, the control module 12 can also detect the concentration of the harmful gas according to the data of the concentration detection module 11 and issue an alarm. In this way, the gas collection device provided by the embodiment of the present application can detect the concentration of harmful gases in the air in real time and accurately, which is beneficial to making timely reminders and thus avoiding threatening people's lives and property safety.

[0045] In some embodiments, the gas collection device further includes a dust-proof filter plate 2. A replacement port is provided in the air inlet passage 4, and the dust-proof filter plate 2 is detachably connected to the replacement port. The gas entering the air inlet passage 4 enters the negative pressure passage 6 through the dust-proof filter plate 2.

[0046] It should be noted that considering that the concentration detection module 11 may be unable to detect the concentration of harmful gases due to the blockage of the dust-proof filter plate 2, which may further threaten people's lives and property safety, a replacement port 5 is provided in the air inlet passage 4, and the dust-proof filter plate 2 is detachably connected to the replacement port 5. In this way, the dust-proof filter plate 2 can be easily replaced. Once the control module 12 issues a reminder to replace the dust-proof filter plate 2, the dust-proof filter plate 2 can be replaced, greatly improving the work efficiency.

[0047] In this way, after the external gas enters the air inlet passage 4, a part of the gas enters the negative pressure passage 6 through the dust-proof filter plate 2, and a part of the gas is directly discharged into the external environment through the air outlet passage communicated with the air inlet passage 4.

[0048] It should be noted that after the dust-proof filter plate 2 is blocked due to long-term work, more air will directly flow through the air outlet channel communicating with the air inlet channel 4. At this time, due to the siphon phenomenon, the air pressure at the front end of the negative pressure channel 6 will decrease. When it decreases to a certain extent, the pressure detection module 3 will transmit the detected pressure value to the control module 12, and the control module 12 will automatically send a reminder to replace the dust-proof filter plate 2.

[0049] In addition, a reminder device and an alarm device can be set. Both the reminder device and the alarm device are electrically connected to the control module 12. When the pressure value detected by the pressure detection module 3 is lower than the preset value, the control module 12 controls the reminder device to send a reminder, thereby reminding the staff to replace the dust-proof filter plate 2; when the gas concentration detected by the concentration detection module 11 is higher than the preset value, the control module 12 controls the alarm device to give an alarm to remind the staff to evacuate in time or take corresponding protective measures, which is beneficial to protecting people's lives and property safety.

[0050] In some embodiments, the control module 12 is arranged in the gas collection chamber 9. Preferably, the gas collection chamber 9 is provided with a drawer-type structure 10, and the concentration detection module 11 and the control module 12 are installed in the drawer-type structure 10.

[0051] Specifically, screw holes are provided around the bottom of the drawer-type structure 10 for installing the concentration detection module 11.

[0052] Of course, according to actual needs, a temperature and humidity sensor and various gas sensors, such as VOC sensors and combustible gas sensors, etc., can also be installed in the gas collection chamber 9.

[0053] In some embodiments, an arch-shaped gas path 7 or an S-shaped gas path is provided in the negative pressure channel 6.

[0054] Specifically, partition plates 8 are provided in the negative pressure channel 6 at intervals in the vertical direction to form an arch-shaped gas path 7. By adopting the arch-shaped gas path 7, the gas flow rate inside the negative pressure channel 6 can be effectively reduced, so that the gas flow rate in the gas collection chamber 9 is slower, and the pressure influence brought by the fan 1 on the gas collection chamber 9 can be reduced. That is, the gas pushed by the fan 1 has a slower flow rate in the negative pressure channel 6 and finally reaches the gas collection chamber 9. At this time, the air pressure in the gas collection chamber 9 is close to the air pressure outside and the gas flow rate is relatively slow, and it will not cause the concentration of harmful gases detected by the concentration detection module 11 to be higher than the concentration in the actual air due to too fast wind speed.

[0055] In some embodiments, the gas collection device further includes a first air outlet channel 13 and a second air outlet channel 14. Among them, the first air outlet channel 13 is communicated with the gas collection chamber 9, and the first air outlet channel 13 is separated from the negative pressure channel 6; the second air outlet channel 14 is communicated with the first air outlet channel 13 and the air inlet channel 4, and the second air outlet channel 14 is used for the gas in the first air outlet channel 13 and the air inlet channel 4 to flow out.

[0056] Furthermore, the gas collection device further includes a deflector 15. The deflector 15 is arranged in the second air outlet channel 14. The deflector 15 can be set to an arc shape or an S shape. The deflector 15 is arranged towards the outlet of the second air outlet channel 14. The gas in the first air outlet channel 13 and the air inlet channel 4 flows out from the outlet of the second air outlet channel 14 after being deflected by the deflector 15.

[0057] Preferably, the above-mentioned air pressure detection module 3 is an air pressure sensor, the concentration detection module 11 is a concentration sensor, and the control module 12 is a PLC (Programmable Logic Controller) or a control circuit board with a preset control chip.

[0058] In addition, the present application also provides a gas collection method, which is applied to the gas collection device described in the above embodiments. The gas collection method includes:

[0059] S1: Control the fan 1 to start;

[0060] S2: Obtain the gas pressure entering the negative pressure channel 6, and perform closed-loop control on the fan 1 according to the gas pressure;

[0061] S3: Obtain the concentration of harmful gas entering the gas collection chamber 9, and issue an alarm according to the concentration of harmful gas.

[0062] It should be noted that the above-mentioned closed-loop control of the fan 1 is realized by the control module 12 through the incremental PID algorithm.

[0063] Specifically, the above step of obtaining the gas pressure entering the negative pressure channel 6 and performing closed-loop control on the fan 1 according to the gas pressure includes:

[0064] S201: Obtain the gas pressure e|n - 2| entering the negative pressure channel 6 at time t 1 , the gas pressure e|n - 1| entering the negative pressure channel 6 at time t 2 , and the gas pressure e|n| entering the negative pressure channel 6 at time t 3 , where t 1 < t 2 < t 3 ;

[0065] S202: Calculate the motor control quantity of the fan 1 according to Δu|n| = Kp*{e|n| - e|n - 1|} + Ki*e|n| + Kd*{e|n| - 2e|n - 1| + e|n - 2|}, and perform closed-loop control on the fan 1 according to the motor control quantity, where Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and Δu|n| is the motor control quantity that should be changed at the current moment for the previous moment.

[0066] Adopting the above control method to perform closed-loop control on the motor 1 can ensure that there is always a constant external air passing through the gas collection chamber 9 for the concentration detection module 11 to collect data, which is beneficial to improving the sensitivity of the concentration detection module 11, and can detect the concentration of harmful gases in the air in real time and accurately, which is beneficial to making timely reminders, thereby avoiding threatening people's lives and property safety.

[0067] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0068] The above has introduced the gas collection device and method provided by this application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the solution and its core idea of this application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A gas collection device, characterized in that, it includes: a gas collection chamber; a concentration detection module, arranged in the gas collection chamber, for detecting the gas concentration; an air inlet channel, communicated with the gas collection chamber through a negative pressure channel; a fan, arranged in the air inlet channel, for providing power to enable gas to enter the gas collection chamber; a gas pressure detection module, arranged at one end of the negative pressure channel close to the air inlet channel, for detecting the pressure of the gas entering the negative pressure channel; a control module, connected to the gas pressure detection module and the concentration detection module, for controlling the fan according to the data feedback of the gas pressure detection module, and for giving an alarm according to the concentration of harmful gas detected by the concentration detection module; an arch-shaped gas path is arranged in the negative pressure channel, so that the negative pressure channel can adjust the gas flow rate and can reduce the pressure influence brought by the fan to the gas collection chamber; The control module is used to obtain the gas pressure e|n-2| entering the negative pressure channel at time t 1 , the gas pressure e|n-1| entering the negative pressure channel at time t 2 , and the gas pressure e|n| entering the negative pressure channel at time t 3 , where t 1 <t 2 <t 3 ; it is also used to calculate the motor control quantity of the fan according to Δu|n| = Kp*{e|n| - e|n-1|} + Ki*e|n| + Kd*{e|n| - 2e|n-1| + e|n-2|}, and perform closed-loop control on the fan according to the motor control quantity, where Kp is the proportionality coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and Δu|n| is the motor control quantity that should be changed at the current moment relative to the previous moment.

2. The gas collection device according to claim 1, characterized in that, it further includes a dust-proof filter plate, a replacement port is arranged in the air inlet channel, the dust-proof filter plate is detachably connected to the replacement port, and the gas entering the air inlet channel enters the negative pressure channel through the dust-proof filter plate.

3. The gas collection device according to claim 1, characterized in that, the gas collection chamber is provided with a drawer-type structure, and the concentration detection module and the control module are installed in the drawer-type structure.

4. The gas collection device according to claim 1, characterized in that, partition plates are arranged at intervals in the vertical direction in the negative pressure channel to form the arch-shaped gas path.

5. The gas collection device according to claim 1, characterized in that, it further includes: a first air outlet channel, communicated with the gas collection chamber and separated from the negative pressure channel; a second air outlet channel, communicated with the first air outlet channel and the air inlet channel, for the gas in the first air outlet channel and the air inlet channel to flow out.

6. The gas collection device according to claim 5, characterized in that, it further includes a deflector, the deflector is arranged in the second air outlet channel, and the gas in the first air outlet channel and the air inlet channel flows out from the outlet of the second air outlet channel after being deflected by the deflector.

7. The gas collection device according to claim 1, characterized in that, one or more of a temperature and humidity sensor, a VOC sensor and a combustible gas sensor are further arranged in the gas collection chamber.

8. A gas collection method, applied to the gas collection device according to any one of claims 1-7, characterized in that, it includes: controlling the fan to start; acquiring the gas pressure entering the negative pressure channel and performing closed-loop control on the fan according to the gas pressure; acquiring the concentration of harmful gas entering the gas collection chamber and giving an alarm according to the concentration of harmful gas.

9. The gas collection method according to claim 8, characterized in that, the step of acquiring the gas pressure entering the negative pressure channel and performing closed-loop control on the fan according to the gas pressure includes: Obtain t 1 The gas pressure e|n - 2|, t entering the negative pressure channel at the moment 2 The gas pressure e|n - 1| and t entering the negative pressure channel at the moment 3 The gas pressure e|n| entering the negative pressure channel at the moment, where t 1 <t 2 <t 3 ; The motor control quantity of the fan is calculated according to Δu|n| = Kp*{e|n| - e|n - 1|} + Ki*e|n| + Kd*{e|n| - 2e|n - 1| + e|n - 2|}, and the fan is subjected to closed-loop control according to the motor control quantity, where Kp is the proportionality coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and Δu|n is the motor control quantity that should be changed at the current moment for the previous moment.

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