Hydrogen sulfide gas leakage monitoring and early warning equipment

Abstract

The utility model provides hydrogen sulfide gas leakage monitoring and early warning equipment, which comprises a laser transmitting module, a laser receiving module and a control module, and is used for judging whether hydrogen sulfide leakage exists in a target area based on a laser signal received by the laser receiving module, and if so, sending an enable signal to an alarm module; the alarm module is used for responding to the enable signal and sending out alarm information; the laser receiving module is electrically connected with the control module; the alarm module is electrically connected with the laser receiving module; in conclusion, the hydrogen sulfide gas leakage monitoring and early warning equipment is adopted, the equipment has very high sensitivity, trace leakage of hydrogen sulfide gas can be accurately detected, non-contact monitoring is carried out on a target area, contact with gas is not needed, and measurement errors possibly caused by poor contact or equipment damage in a traditional method are avoided; and non-contact monitoring can also perform remote monitoring in a dangerous environment, so that the risk of manual detection is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen sulfide monitoring technology, and more specifically, to a hydrogen sulfide gas leak monitoring and early warning device. Background Technology

[0002] Before the feed gas enters the purification system, it needs to be pretreated to remove impurities. Feed gas often contains hydrogen sulfide and other impurities, and these sulfur compounds may be released during pretreatment, forming hydrogen sulfide. Desulfurization is a crucial step in oil and gas purification, aiming to remove hydrogen sulfide from the feed gas. However, during desulfurization, hydrogen sulfide leakage may occur due to various factors such as the type of solvent, production process, and equipment design. Especially when the solvent concentration is high, the loss of amine solution is significant, which may exacerbate the release of hydrogen sulfide.

[0003] The existing fixed hydrogen sulfide gas detectors and portable gas detectors in the various production units and exhaust gas treatment areas of the plant have limitations such as limited monitoring distance and long response time. There are many static sealing points such as flanges and blind plates in the equipment. The manual leak detection method is labor-intensive, has a long inspection cycle, and is inefficient. It is impossible to monitor and grasp the dynamics and early warning of gas emissions and leaks in a comprehensive and real-time manner. It cannot provide information on the movement, diffusion and accumulation trends of gases, cannot promptly grasp the sudden abnormal emissions and leaks in the surrounding area, and cannot trace the source. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydrogen sulfide gas leak monitoring and early warning device to overcome the shortcomings of the existing technology that cannot monitor whether there is a hydrogen sulfide leak in the target area in real time.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a hydrogen sulfide gas leak monitoring and early warning device, comprising: a laser emitting module for emitting a laser signal toward a target area; a laser receiving module for receiving the laser signal after it passes through the target area; a control module for determining whether there is a hydrogen sulfide leak in the target area based on the laser signal received by the laser receiving module, and if so, sending an enable signal to an alarm module; an alarm module for responding to the enable signal and issuing an alarm message; the laser receiving module is electrically connected to the control module; and the alarm module is electrically connected to the laser receiving module.

[0006] In one embodiment, the hydrogen sulfide gas leak monitoring and early warning device further includes: an optical reflection module, a first bracket, and a second bracket; the optical reflection module is used to adjust the propagation direction of the laser signal emitted by the laser emitting module so that the laser signal is transmitted to the laser receiving module; the laser emitting module and the laser receiving module are both slidably connected to the first bracket; the optical reflection module is slidably connected to the second bracket; the first bracket is located on one side of the target area; the second bracket is located on the other side of the target area; the connecting line between the first bracket and the second bracket passes through the center point of the target area; the center points of the laser emitting module, the laser receiving module, and the optical reflection module are all at the same horizontal level.

[0007] In one embodiment, the first support includes a first fixed base and a first column; the bottom of the first column is fixedly connected to the first fixed base; a first clamp is movably disposed on the upper part of the first column; the laser emitting module and the laser receiving module are both fixedly connected to the first clamp.

[0008] In one embodiment, the second bracket includes a second fixed base and a second column; the bottom of the second column is fixedly connected to the second fixed base; a second clamp is movably disposed on the upper part of the first column; and the optical reflection module is fixedly connected to the second clamp.

[0009] In one embodiment, an explosion-proof box is fixedly installed on the first column; the control module is housed inside the explosion-proof box; the control module is electrically connected to the laser emitting module and the laser receiving module via wires.

[0010] In one embodiment, the control module specifically includes: a power management unit for converting 220V AC power into 24V DC power and 5V DC power; a communication unit for converting the single-ended signal generated by the computing unit into a differential signal; a computing unit for determining whether there is hydrogen sulfide leakage in the target area based on the differential signal; the power management unit is electrically connected to the communication unit, the computing unit, the laser emitting module, and the laser receiving module respectively; the communication unit is communicatively connected to the laser receiving module and the computing unit respectively.

[0011] In one embodiment, the power management unit includes: a first step-down subunit for converting 220V AC to 16V AC; a rectifier subunit for converting 16V AC to 24V DC; and a second step-down subunit for converting 24V DC to 5V DC. The output terminal of the first step-down subunit is electrically connected to the input terminal of the rectifier subunit, and the output terminal of the rectifier subunit is electrically connected to the input terminal of the second step-down subunit.

[0012] In one embodiment, the computing unit includes: a computing chip, a first isolation optocoupler, a second isolation optocoupler, a third isolation optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; the fifth pin of the computing chip is electrically connected to the fifth pin of the first isolation optocoupler; the fifth pin of the first isolation optocoupler is also electrically connected to a power supply voltage terminal through the second resistor; the fourth pin of the first isolation optocoupler is grounded; the first pin of the first isolation optocoupler is electrically connected to a 5V voltage terminal through the first resistor; the second pin of the first isolation optocoupler is electrically connected to the communication unit; and the seventh pin of the computing chip is electrically connected to the second pin of the second isolation optocoupler. The first pin of the second isolation optocoupler is electrically connected to the power supply voltage terminal through the fourth resistor; the fourth pin of the second isolation optocoupler is grounded; the fifth pin of the second isolation optocoupler is electrically connected to the communication unit; the fifth pin of the second isolation optocoupler is also electrically connected to the 5V voltage terminal through the third resistor; the nineteenth pin of the computing chip is electrically connected to the second pin of the third isolation optocoupler; the first pin of the third isolation optocoupler is electrically connected to the power supply voltage terminal through the fifth resistor; the fourth pin of the third isolation optocoupler is grounded through the sixth resistor, and the fourth pin of the third isolation optocoupler is also electrically connected to the communication unit; the fifth pin of the third isolation optocoupler is electrically connected to the 5V voltage terminal.

[0013] In one embodiment, the communication unit specifically includes: a first signal conversion chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first diode, and a second diode; the first pin of the first signal conversion chip is connected to the second pin of the first isolation optocoupler; the second and third pins of the first signal conversion chip are both connected to the fourth pin of the third isolation optocoupler; the fourth pin of the first signal conversion chip is connected to the fifth pin of the second isolation optocoupler; the fifth pin of the first signal conversion chip is grounded; the sixth pin of the first signal conversion chip is grounded through the ninth resistor; the sixth pin of the first signal conversion chip is electrically connected to the anode of the second diode through the eleventh resistor; the seventh pin of the first signal conversion chip is connected to a 5V voltage terminal through the eighth resistor; the seventh pin of the first signal conversion chip is electrically connected to the anode of the first diode through the tenth resistor; the sixth pin of the first signal conversion chip is connected to the seventh pin of the first signal conversion chip through the seventh resistor; the eighth pin of the first signal conversion chip is connected to a 5V voltage terminal; the anode of the first diode is communicatively connected to a host computer; the anode of the second diode is communicatively connected to a host computer.

[0014] In one embodiment, the communication unit further includes: a second signal conversion chip and a connector for communicating with a laser emitting module and / or a laser receiving module; the second pin of the second signal conversion chip is grounded; the fourth pin of the second signal conversion chip is connected to the forty-fourth pin of the computing chip; the sixth pin of the second signal conversion chip is connected to the forty-third pin of the computing chip; the seventh pin of the second signal conversion chip is connected to the forty-second pin of the computing chip; the eighth pin of the second signal conversion chip is connected to the forty-first pin of the computing chip; the ninth pin of the second signal conversion chip is connected to the thirty-fifth pin of the computing chip; the tenth pin of the second signal conversion chip is connected to the thirty-fourth pin of the computing chip; the thirteenth pin of the second signal conversion chip is connected to the fourth pin of the connector; the fourteenth pin of the second signal conversion chip is connected to the third pin of the connector; the sixteenth pin of the second signal conversion chip is connected to the second pin of the connector; the seventeenth pin of the second signal conversion chip is connected to the first pin of the connector; and the twenty-eighth pin of the second signal conversion chip is connected to a 5V voltage terminal.

[0015] In summary, this utility model has the following beneficial effects: A hydrogen sulfide gas leak monitoring and early warning device includes: a laser emitting module for emitting laser signals to a target area; a laser receiving module for receiving the laser signals after they pass through the target area; a control module for determining whether there is a hydrogen sulfide leak in the target area based on the laser signals received by the laser receiving module, and if so, sending an enable signal to an alarm module; an alarm module for responding to the enable signal and issuing an alarm message; the laser receiving module is electrically connected to the control module; the alarm module is electrically connected to the laser receiving module. In summary, this application employs a hydrogen sulfide gas leak monitoring and early warning device. This device has very high sensitivity and can accurately detect trace leaks of hydrogen sulfide gas. It performs non-contact monitoring of the target area without contact with the gas, avoiding measurement errors that may occur in traditional methods due to poor contact or equipment damage. Non-contact monitoring also enables remote monitoring in hazardous environments, reducing the risks associated with manual detection. Attached Figure Description

[0016] Figure 1 This is a block diagram of a hydrogen sulfide gas leak monitoring and early warning device according to the present invention;

[0017] Figure 2 This is a schematic diagram of the power management unit circuit of this utility model;

[0018] Figure 3 This is a circuit schematic diagram of the computing unit and communication unit of this utility model;

[0019] Figure 4 This is a schematic diagram of the second signal conversion chip circuit of this utility model;

[0020] Figure 5 This is a schematic diagram of the installation of a hydrogen sulfide gas leak monitoring and early warning device according to the present invention;

[0021] In the diagram: 1. Optical reflection module; 2. First mounting base; 3. First column; 4. Second mounting base; 5. Second column; 6. Explosion-proof box. Detailed Implementation

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0023] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] To address the aforementioned problems, this invention provides a hydrogen sulfide gas leak monitoring and early warning device, such as... Figures 1-5 As shown, it includes:

[0027] The laser emitting module is used to emit laser signals toward the target area;

[0028] A laser receiving module is used to receive the laser signal after it has passed through the target area;

[0029] The control module is used to determine whether there is hydrogen sulfide leakage in the target area based on the laser signal received by the laser receiving module. If so, it sends an enable signal to the alarm module.

[0030] An alarm module is used to respond to the enable signal and issue an alarm message;

[0031] The laser receiving module is electrically connected to the control module; the alarm module is electrically connected to the laser receiving module.

[0032] In practical applications, the laser emitting module specifically comprises a tunable semiconductor laser. Since hydrogen sulfide gas has a distinct absorption peak in the infrared region, when the laser beam passes through the area to be detected, if hydrogen sulfide gas is present in that area, the gas molecules will absorb a certain amount of laser energy at their specific absorption wavelength. The wavelength of light absorbed by hydrogen sulfide molecules is known and has a specific absorption spectrum. The laser receiving module specifically consists of a photodetector or other type of sensor that receives the laser beam after it has passed through the gas medium and converts the signal into an electrical signal. By comparing this signal with a preset concentration-absorbance relationship, the system can accurately measure the gas concentration. In other words, there is a quantitative relationship between the light intensity output by the laser source and the concentration of gas molecules. When the gas concentration increases, the light intensity absorbed by the gas molecules increases, leading to a decrease in the intensity of the received signal light. By analyzing the change in light intensity, the concentration of hydrogen sulfide gas can be calculated. The control module determines, according to a predetermined program, whether the electrical signal generated by the laser receiving module meets predetermined conditions, specifically whether the light intensity in the corresponding wavelength range of the spectrum is below a predetermined threshold. If so, it indicates the presence of leaked hydrogen sulfide gas in the target area, and an enable signal is sent to the alarm module. The alarm module then issues an alert to relevant personnel for timely investigation of the area. In summary, this application employs a hydrogen sulfide gas leak monitoring and early warning device. This device has very high sensitivity and can accurately detect minute leaks of hydrogen sulfide gas. It performs non-contact monitoring of the target area, eliminating the need for contact with the gas and avoiding measurement errors that may occur in traditional methods due to poor contact or equipment damage. Non-contact monitoring also enables remote monitoring in hazardous environments, reducing the risks associated with manual inspection.

[0033] In existing technologies, to monitor a target area, the laser emitting module and the laser receiving module need to be placed on opposite sides of the target area, requiring power and communication signals to be provided to each module. This increases the complexity of the system and the difficulty of installation. Especially in large-scale applications, the complexity of wiring and installation increases significantly.

[0034] To address the aforementioned issues, in one embodiment, the system further includes: an optical reflection module 1, a first support, and a second support; the optical reflection module 1 is used to adjust the propagation direction of the laser signal emitted by the laser emitting module, so that the laser signal is transmitted to the laser receiving module; both the laser emitting module and the laser receiving module are slidably connected to the first support; the optical reflection module 1 is slidably connected to the second support; the first support is located on one side of the target area; the second support is located on the other side of the target area; the connecting line between the first support and the second support passes through the center point of the target area; the center points of the laser emitting module, the laser receiving module, and the optical reflection module 1 are all at the same horizontal level.

[0035] In practical applications, to improve system manageability, the laser emitting module and the laser receiving module are integrated into one unit. This eliminates the need for separate power cables and communication cables for the laser emitting and receiving modules. To ensure the laser emitted by the emitting module is received by the receiving module, an optical reflection module 1 is installed on the other side of the target area. The optical reflection module 1 can use a plane mirror or a corner cone for optical reflection. The corner cone mirror has a unique advantage: it can focus or reflect laser beams from various directions to the same direction. To ensure the laser accurately illuminates the optical reflection module 1, the laser emitting module, laser reflection module, and laser receiving module must all be positioned at the same horizontal level to guarantee accurate reception of laser light passing through the target area. In summary, integrating the laser emitting and receiving modules avoids the complex wiring problems associated with providing separate power and communication cables for each module. This design simplifies equipment installation, maintenance, and management, reduces wiring complexity, and, especially in large-scale systems, reduces labor and time costs.

[0036] In one embodiment, the first support includes a first fixed base 2 and a first column 3; the bottom of the first column 3 is fixedly connected to the first fixed base 2; a first clamp is movably provided on the upper part of the first column 3; the laser emitting module and the laser receiving module are both fixedly connected to the first clamp.

[0037] In one embodiment, the second bracket includes a second fixed base 4 and a second column 5; the bottom of the second column 5 is fixedly connected to the second fixed base 4; a second clamp is movably provided on the upper part of the first column 3; and the optical reflection module 1 is fixedly connected to the second clamp.

[0038] In practical applications, the first fixing base 2 is used to fix it to the ground, and the bottom of the first column 3 is fixed to the first fixing base 2 to provide stable support for the laser emitting module and the laser receiving module. To avoid excessive swaying of the column, the height of the column needs to be limited to 60cm. During installation, after applying a lateral pressure of 50 Newtons, the horizontal sway deviation should not exceed 3mm-5mm, the vertical deviation should not exceed 1.5mm-3mm, and the adjustment gap of the waist hole should not be less than 5mm. By setting the movable clamp of the first column 3, the laser emitting module and the receiving module can be finely adjusted without affecting the overall stability. This ensures that the horizontal height of the equipment is precisely aligned with the horizontal height of the reflective module, avoiding monitoring errors caused by alignment problems.

[0039] In one embodiment, an explosion-proof box 6 is fixedly installed on the first column 3; the control module is housed inside the explosion-proof box 6; the control module is electrically connected to the laser emitting module and the laser receiving module via wires.

[0040] In practical applications, since the optical reflection module 1 on the second column 5 in this application is a passive device and does not require power lines and communication cables, there is no need to set up an explosion-proof box 6. Placing the laser emitting module and the laser receiving module on the same column can reduce the number of explosion-proof boxes 6, thereby reducing equipment and maintenance costs. Placing the control module in the explosion-proof box 6 can prevent the control module from being interfered with by external factors, improving the stability and safety of the control module's operation. In one embodiment, the control module specifically includes: a power management unit for converting 220V AC power into 24V DC power and 5V DC power; a communication unit for converting the single-ended signal generated by the computing unit into a differential signal; a computing unit for determining whether there is hydrogen sulfide leakage in the target area based on the differential signal; the power management unit is electrically connected to the communication unit, the computing unit, the laser emitting module, and the laser receiving module respectively; the communication unit is communicatively connected to the laser receiving module and the computing unit respectively.

[0041] In practical applications, industrial electrical signals are typically 220V AC, but in general digital circuits, 12V or 5V DC is commonly used. To convert 220V AC to the DC commonly used in digital circuits, the 220V voltage needs to be reduced to 16V AC using an AC transformer, then the 16V AC needs to be converted to 24V DC using a rectifier bridge, and finally the 12V DC needs to be stepped down to 5V DC to achieve a smooth conversion. In practical applications, to achieve remote monitoring of the target area, long cables are needed to upload the data collected by the control module to the server for statistical analysis. Since signals are susceptible to interference during long-distance transmission, this application converts single-ended signals into differential signals in the communication unit to enable communication between the computing unit and the remote host computer. The computing unit is used to compare the wavelength of the received laser signal according to a predetermined program to see if it meets the requirements.

[0042] In one embodiment, the power management unit includes: a first step-down subunit for converting 220V AC to 16V AC; a rectifier subunit for converting 16V AC to 24V DC; and a second step-down subunit for converting 24V DC to 5V DC. The output terminal of the first step-down subunit is electrically connected to the input terminal of the rectifier subunit, and the output terminal of the rectifier subunit is electrically connected to the input terminal of the second step-down subunit.

[0043] In practical applications, the first step-down subunit is an AC step-down converter used to convert 220V AC to 16V AC. The rectifier subunit is made of four rectifier diodes and is used to convert 16V AC to 24V DC. The output of the rectifier subunit also has two filter capacitors, C1 and C2. The second step-down subunit is made of a step-down chip of model LM7815T. The step-down chip can convert 24V DC to 5V DC and provides two filter capacitors, C3 and C4, for the 5V output.

[0044] In one embodiment, the computing unit includes: a computing chip U6, a first isolation optocoupler U3, a second isolation optocoupler U4, a third isolation optocoupler U5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the fifth pin of the computing chip U6 is electrically connected to the fifth pin of the first isolation optocoupler U3; the fifth pin of the first isolation optocoupler U3 is also electrically connected to a power supply voltage terminal through the second resistor R2; the fourth pin of the first isolation optocoupler U3 is grounded; the first pin of the first isolation optocoupler U3 is electrically connected to a 5V voltage terminal through the first resistor R1; the second pin of the first isolation optocoupler U3 is electrically connected to the communication unit; the seventh pin of the computing chip U6 is connected to the sixth pin of the second isolation optocoupler U4. The two pins are electrically connected; the first pin of the second isolation optocoupler U4 is electrically connected to the power supply voltage terminal through the fourth resistor R4; the fourth pin of the second isolation optocoupler U4 is grounded; the fifth pin of the second isolation optocoupler U4 is electrically connected to the communication unit; the fifth pin of the second isolation optocoupler U4 is also electrically connected to the 5V voltage terminal through the third resistor R3; the nineteenth pin of the computing chip U6 is electrically connected to the second pin of the third isolation optocoupler U5; the first pin of the third isolation optocoupler U5 is electrically connected to the power supply voltage terminal through the fifth resistor R5; the fourth pin of the third isolation optocoupler U5 is grounded through the sixth resistor R6; the fourth pin of the third isolation optocoupler U5 is also electrically connected to the communication unit; the fifth pin of the third isolation optocoupler U5 is electrically connected to the 5V voltage terminal.

[0045] In practical applications, the computing chip uses an AT80C31X2 microcontroller chip. This chip can compare and analyze the received photoelectric signals based on a predetermined program to determine whether the corresponding spectral signal meets the standards for hydrogen sulfide leakage. The laser receiving module typically uses a photodetector to convert the light signal into an electrical signal. When the light intensity decreases, the generated voltage signal will also decrease accordingly. The voltage change is proportional to the laser intensity and gas concentration. As the hydrogen sulfide gas concentration increases, the signal amplitude gradually decreases, and the amplitude of the electrical signal becomes smaller, reflecting the change in gas concentration. Therefore, it is only necessary to compare the peak intensity of the electrical signal to determine whether there is a hydrogen sulfide leak. The first isolation optocoupler is used to transmit the signal from the first signal conversion chip U2 to the computing chip, and the second and third isolation optocouplers are used to transmit the microcontroller's signal to the first signal conversion chip.

[0046] In one embodiment, the communication unit specifically includes: a first signal conversion chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first diode U7, and a second diode U8; the first pin of the first signal conversion chip U2 is connected to the second pin of the first isolation optocoupler U3; the second and third pins of the first signal conversion chip U2 are both connected to the fourth pin of the third isolation optocoupler U5; the fourth pin of the first signal conversion chip U2 is connected to the fifth pin of the second isolation optocoupler U4; the fifth pin of the first signal conversion chip U2 is grounded; the sixth pin of the first signal conversion chip U2 is grounded through the ninth resistor R9. The sixth pin of the first signal conversion chip U2 is electrically connected to the anode of the second diode U8 through the eleventh resistor R11; the seventh pin of the first signal conversion chip U2 is connected to the 5V voltage terminal through the eighth resistor R8; the seventh pin of the first signal conversion chip U2 is electrically connected to the anode of the first diode U7 through the tenth resistor R10; the sixth pin of the first signal conversion chip U2 is connected to the seventh pin of the first signal conversion chip U2 through the seventh resistor R7; the eighth pin of the first signal conversion chip U2 is connected to the 5V voltage terminal; the anode of the first diode U7 is connected to the host computer for communication; the anode of the second diode U8 is connected to the host computer for communication.

[0047] In practical applications, the first signal conversion chip U2 uses the SN75176BDR signal conversion chip, which can convert the single-ended signal output by the microcontroller into a differential signal and use the RS485 protocol for long-distance transmission. In actual factory environments, electromagnetic signals are complex, and single-ended signals are easily affected by electromagnetic interference during transmission. Converting single-ended signals into differential signals can effectively improve the anti-interference capability of signal transmission and avoid false alarms or missed alarms during signal transmission.

[0048] In one embodiment, the communication unit further includes: a second signal conversion chip U9 and a connector for communicating with a laser emitting module and / or a laser receiving module; the second pin of the second signal conversion chip U9 is grounded; the fourth pin of the second signal conversion chip U9 is connected to the forty-fourth pin of the computing chip U6; the sixth pin of the second signal conversion chip U9 is connected to the forty-third pin of the computing chip U6; the seventh pin of the second signal conversion chip U9 is connected to the forty-second pin of the computing chip U6; and the eighth pin of the second signal conversion chip U9 is connected to the forty-first pin of the computing chip U6. Pin 9 of the second signal conversion chip U9 is connected to pin 35 of the computing chip U6; pin 10 of the second signal conversion chip U9 is connected to pin 34 of the computing chip U6; pin 12 of the second signal conversion chip U9 is connected to pin 4 of the connector; pin 13 of the second signal conversion chip U9 is connected to pin 3 of the connector; pin 16 of the second signal conversion chip U9 is connected to pin 2 of the connector; pin 17 of the second signal conversion chip U9 is connected to pin 1 of the connector; and pin 28 of the second signal conversion chip U9 is connected to a 5V voltage terminal.

[0049] In practical applications, the second signal conversion chip U9 uses the ENC28J60 / SS model, which converts the Ethernet protocol signal from the RJ45 interface into a data signal that the microcontroller can recognize and process. Specifically, pin 7 (SI) of the second signal conversion chip U9 is used to receive data from the microcontroller; pin 6 (SO) is used to send data to the microcontroller; pin 4 is used to send an interrupt request to the microcontroller; pin 8 (SCK) is used as the clock signal for synchronizing data transmission, and the microcontroller generates the clock signal to drive data transmission; pin 9 is used to receive the enable signal. When CS is low, the chip is selected, allowing data transmission; when CS is high, the chip is unselected, and communication is interrupted. Connector H1 is used to connect to the laser module. Because the laser module is an integrated design and uses an RJ45 interface for connection, the second signal conversion chip U9 is needed to convert the Ethernet protocol signal into a single-ended signal corresponding to the microcontroller.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0051] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A hydrogen sulfide gas leakage monitoring and early warning device, characterized in that, The application relates to a hydrogen sulfide leakage detection device. The device comprises: a laser emission module for emitting a laser signal to a target area; a laser receiving module for receiving the laser signal after the laser signal passes through the target area; a control module for judging whether hydrogen sulfide leaks exist in the target area based on the laser signal received by the laser receiving module, and sending an enable signal to an alarm module if hydrogen sulfide leaks exist; an alarm module for sending an alarm information in response to the enable signal; an optical reflection module for adjusting the propagation direction of the laser signal emitted by the laser emission module so that the laser signal is transmitted into the laser receiving module; 2. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 1, characterized in that, the laser receiving module is electrically connected with the control module; and the alarm module is electrically connected with the laser receiving module. The device further comprises: a first support and a second support; the laser emission module and the laser receiving module are both in sliding connection with the first support; the optical reflection module is in sliding connection with the second support; 3. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 2, characterized in that, the first support is located on one side of the target area; the second support is located on the other side of the target area; the connecting line of the first support and the second support passes through the center point of the target area; and the center points of the laser emission module, the laser receiving module and the optical reflection module are all at the same horizontal height. The first support comprises a first fixed seat and a first column; 4. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 3, characterized in that, the bottom of the first column is fixedly connected with the first fixed seat; a first clamp is movably arranged on the top of the first column; and the laser emission module and the laser receiving module are both fixedly connected with the first clamp. The second support comprises a second fixed seat and a second column; 5. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 4, characterized in that, the bottom of the second column is fixedly connected with the second fixed seat; a second clamp is movably arranged on the top of the first column; and the optical reflection module is fixedly connected with the second clamp.

6. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 1, characterized in that, An explosion-proof box is fixedly arranged on the first column; the control module is contained in the interior of the explosion-proof box; and the control module is electrically connected with the laser emission module and the laser receiving module through wires. The control module specifically comprises: a power management unit for converting 220V alternating current into 24V direct current and 5V direct current; a communication unit for converting the single-ended signal generated by a calculation unit into a differential signal; a calculation unit for judging whether hydrogen sulfide leaks exist in the target area based on the differential signal; the power management unit is electrically connected with the communication unit, the calculation unit, the laser emission module and the laser receiving module respectively; 7. The hydrogen sulfide gas leakage monitoring and early warning device according to claim 6, characterized in that, the communication unit is in communication connection with the laser receiving module and the calculation unit respectively. The power management unit comprises: a first voltage reduction subunit for converting 220V alternating current into 16V alternating current; a rectification subunit for converting 16V alternating current into 24V direct current; a second voltage reduction subunit for converting 24V direct current into 5V direct current; the output end of the first voltage reduction subunit is electrically connected with the input end of the rectification subunit; and the output end of the rectification subunit is electrically connected with the input end of the second voltage reduction subunit.

8. The hydrogen sulfide gas leak monitoring and warning device of claim 7, wherein, The computing unit comprises a computing chip, a first isolated optical coupler, a second isolated optical coupler, a third isolated optical coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; The fifth pin of the computing chip is electrically connected with the fifth pin of the first isolated optical coupler; the fifth pin of the first isolated optical coupler is further electrically connected with a power voltage end through the second resistor; the fourth pin of the first isolated optical coupler is grounded; the first pin of the first isolated optical coupler is electrically connected with a 5V voltage end through the first resistor; and the second pin of the first isolated optical coupler is electrically connected with the communication unit; The seventh pin of the computing chip is electrically connected with the second pin of the second isolated optical coupler; the first pin of the second isolated optical coupler is electrically connected with a power voltage end through the fourth resistor; the fourth pin of the second isolated optical coupler is grounded; the fifth pin of the second isolated optical coupler is electrically connected with the communication unit; and the fifth pin of the second isolated optical coupler is further electrically connected with a 5V voltage end through the third resistor; The nineteenth pin of the computing chip is electrically connected with the second pin of the third isolated optical coupler; the first pin of the third isolated optical coupler is electrically connected with a power voltage end through the fifth resistor; the fourth pin of the third isolated optical coupler is grounded through the sixth resistor; the fourth pin of the third isolated optical coupler is further electrically connected with the communication unit; and the fifth pin of the third isolated optical coupler is electrically connected with a 5V voltage end. 9.The hydrogen sulfide gas leakage monitoring and warning device according to claim 8, characterized in that, The communication unit specifically comprises a first signal conversion chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first diode and a second diode; The first pin of the first signal conversion chip is connected with the second pin of the first isolated optical coupler; The second pin and the third pin of the first signal conversion chip are both connected with the fourth pin of the third isolated optical coupler; The fourth pin of the first signal conversion chip is connected with the fifth pin of the second isolated optical coupler; The fifth pin of the first signal conversion chip is grounded; The sixth pin of the first signal conversion chip is grounded through the ninth resistor; and the sixth pin of the first signal conversion chip is electrically connected with the anode of the second diode through the eleventh resistor; The seventh pin of the first signal conversion chip is connected with a 5V voltage end through the eighth resistor; and the seventh pin of the first signal conversion chip is electrically connected with the anode of the first diode through the tenth resistor; The sixth pin of the first signal conversion chip is connected with the seventh pin of the first signal conversion chip through the seventh resistor; The eighth pin of the first signal conversion chip is connected with a 5V voltage end; The anode of the first diode is in communication connection with an upper computer; The anode of the second diode is in communication connection with the upper computer.

10. The hydrogen sulfide gas leak monitoring and warning device of claim 9, wherein, The communication unit further comprises a second signal conversion chip and a plug for being in communication connection with a laser emission module and / or a laser receiving module; The second pin of the second signal conversion chip is grounded; The fourth pin of the second signal conversion chip is connected with the forty-fourth pin of the computing chip; The sixth pin of the second signal conversion chip is connected with the forty-third pin of the computing chip; The seventh pin of the second signal conversion chip is connected with the forty-second pin of the computing chip; The eighth pin of the second signal conversion chip is connected with the forty-first pin of the computing chip; The ninth pin of the second signal conversion chip is connected with the thirty-fifth pin of the computing chip; The tenth pin of the second signal conversion chip is connected with the thirty-fourth pin of the computing chip; The thirteenth pin of the second signal conversion chip is connected with the fourth pin of the plug; The fourteenth pin of the second signal conversion chip is connected with the third pin of the plug; The sixteenth pin of the second signal conversion chip is connected with the second pin of the plug; The seventeenth pin of the second signal conversion chip is connected with the first pin of the plug; The twenty-eighth pin of the second signal conversion chip is connected with a 5V voltage end.

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