A gas sensing device, collector and gas alarm system

Abstract

The present application is applicable to the technical field of gas alarms, and provides a gas sensing device, a collector and a gas alarm system, wherein the gas sensing device comprises a slave instrument bus module, a first power module, a first controller and a gas sensor; the slave instrument bus module, the first controller and the gas sensor are connected in sequence, and the first power module is respectively connected to the slave instrument bus module, the first controller and the gas sensor; by connecting the slave instrument bus module to the main instrument bus module of the collector through a two-wire and non-polar instrument bus, receiving a first power signal sent by the main instrument bus module and outputting it to the first power module, powering the slave instrument bus module, the first controller and the gas sensor, and upon receiving a request signal sent by the main instrument bus module, sending the gas concentration data output by the gas sensor to the main instrument bus module through the instrument bus, the wiring difficulty can be reduced, the number of wiring can be reduced and the communication quality can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of gas alarms, and in particular, relates to a gas sensor device, a collector and a gas alarm system. Background Art

[0002] Gas alarm systems are widely used in various industrial sites to detect the leakage of flammable or toxic gases. When the flammable or toxic gas reaches a critical value, the gas alarm system will send an alarm signal to remind relevant personnel to take safety measures to prevent explosions, fires or poisoning accidents, thereby ensuring safe production.

[0003] Most existing gas alarm systems use RS485-based communication to communicate with the host. RS485 has polarity requirements when wiring. It is easy to connect the wrong wires during the actual installation process, and it is easily disturbed by the external environment, resulting in unstable communication quality. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a gas sensor device, a collector and a gas alarm system to solve the problem that most existing gas alarm systems communicate with the host based on RS485. RS485 has polarity requirements when wiring, it is easy to connect the wrong wires during the actual installation process, and it is easy to be disturbed by the external environment, resulting in unstable communication quality.

[0005] A first aspect of an embodiment of the present application provides a gas sensing device, including a slave meter bus module, a first power module, a first controller, and a gas sensor;

[0006] The slave instrument bus module, the first controller and the gas sensor are connected in sequence, and the first power supply module is connected to the slave instrument bus module, the first controller and the gas sensor respectively;

[0007] The slave instrument bus module is used to connect to the master instrument bus module of the collector through the instrument bus, receive the first power signal sent by the master instrument bus module and output it to the first power module, and when receiving the request signal sent by the master instrument bus module, output the request signal to the first controller;

[0008] The first power supply module is used to perform voltage conversion on the first power supply signal to supply power to the slave instrument bus module, the first controller and the gas sensor;

[0009] The gas sensor is used to detect gas concentration and output gas concentration data to the first controller;

[0010] The first controller is used to output the gas concentration data to the slave instrument bus module when receiving the request signal;

[0011] The slave instrument bus module is further configured to send the gas concentration data to the master instrument bus module via the instrument bus when receiving the gas concentration data.

[0012] In one embodiment, the slave meter bus module includes a slave meter bus transceiver, a slave meter bus interface, and a first dual-channel digital isolator;

[0013] The first instrument bus terminal, the second instrument bus terminal, the data receiving terminal, the data sending terminal and the power supply terminal of the slave instrument bus transceiver are respectively connected with the first instrument bus terminal and the second instrument bus terminal of the slave instrument bus interface, the first data sending terminal and the first data receiving terminal of the first dual-channel digital isolator and the power supply output terminal of the first power supply module in a one-to-one correspondence;

[0014] The power input terminal of the slave instrument bus interface is connected to the power input terminal of the first power module;

[0015] The first power supply terminal and the second power supply terminal of the first dual-channel digital isolator are connected to the power output terminal of the first power module, and the second data receiving terminal and the second data sending terminal of the first dual-channel digital isolator are respectively connected to the data sending terminal and the data receiving terminal of the first controller in a one-to-one correspondence;

[0016] The power input terminal, the first instrument bus terminal and the second instrument bus terminal of the slave instrument bus interface are used to connect to the master instrument bus module through the instrument bus;

[0017] The slave instrument bus transceiver is used to output the request signal to the first controller through the first dual-channel digital isolator when the request signal is received through the slave instrument bus interface, and is also used to send the gas concentration data to the master instrument bus module through the slave instrument bus interface when the gas concentration data is received through the first dual-channel digital isolator.

[0018] In one embodiment, the repeater connection terminal of the slave instrument bus interface is connected to the repeater connection terminal of the first controller;

[0019] The power input terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the slave instrument bus interface are used to connect to the instrument bus through a repeater.

[0020] In one embodiment, the first power module includes a first power conversion unit, a second power conversion unit and a third power conversion unit;

[0021] The power input end of the first power conversion unit and the power input end of the second power conversion unit are connected to the instrument bus module, the power output end of the first power conversion unit is connected to the power input end of the third power conversion unit, the power output end of the second power conversion unit is connected to the gas sensor, and the power output end of the third power conversion unit is connected to the slave instrument bus module and the first controller;

[0022] The first power conversion unit is used to convert the first power signal into a second power signal;

[0023] The third power conversion unit is used to convert the second power signal into a third power signal to supply power to the slave instrument bus module and the first controller;

[0024] The second power conversion unit is used to convert the first power signal into a fourth power signal to supply power to the gas sensor.

[0025] In one embodiment, the gas sensing device further comprises a first display connected to the first controller and the first power module, for displaying the gas concentration data.

[0026] A second aspect of an embodiment of the present application provides a collector, including a main instrument bus module, a second power supply module, an RS485 communication module, a second controller and an alarm control module;

[0027] The main instrument bus module, the RS485 communication module, the second controller and the alarm control module are connected in sequence, and the second power supply module is connected to the main instrument bus module, the second controller and the alarm control module respectively;

[0028] The second power supply module is used to convert the power supply signal into a first power supply signal and a fifth power supply signal and output them to the main instrument bus module, and is also used to convert the first power supply signal into a voltage to supply power to the main instrument bus module, the second controller and the alarm control module;

[0029] The master instrument bus module is used to connect to the slave instrument bus module of the gas sensor device through the instrument bus, and send the first power supply signal to the slave instrument bus module to supply power to the gas sensor device;

[0030] The second controller is used to control the main instrument bus module to output a request signal to the slave instrument bus module through the RS485 communication module to obtain the gas concentration data collected by the gas sensor device, and output an alarm control signal to the alarm control module according to the gas concentration data;

[0031] The alarm control module is used to connect to the alarm and control the alarm to send out an alarm signal according to the alarm control signal;

[0032] Wherein, the request signal is composed of the first power signal and / or the fifth power signal.

[0033] In one embodiment, the main instrument bus module includes a main instrument bus transceiver, a main instrument bus interface, and a second dual-channel digital isolator;

[0034] The first instrument bus terminal, the second instrument bus terminal, the data receiving terminal, the data sending terminal and the power supply terminal of the main instrument bus transceiver are respectively connected with the first instrument bus terminal and the second instrument bus terminal of the main instrument bus interface, the first data sending terminal and the first data receiving terminal of the second dual-channel digital isolator and the power supply output terminal of the second power supply module in a one-to-one correspondence;

[0035] The power output end of the main instrument bus interface is connected to the power output end of the second power module;

[0036] The first power supply terminal and the second power supply terminal of the second dual-channel digital isolator are connected to the power output terminal of the second power supply module, and the second data receiving terminal and the second data sending terminal of the second dual-channel digital isolator are respectively connected to the data sending terminal and the data receiving terminal of the RS485 communication module in a one-to-one correspondence;

[0037] The power output terminal, the first instrument bus terminal and the second instrument bus terminal of the master instrument bus interface are used to connect with the slave instrument bus module through the instrument bus;

[0038] The main instrument bus transceiver is used to send the request signal to the slave instrument bus module through the main instrument bus interface when the request signal is received through the second dual-channel digital isolator, and is also used to output the gas sensor data to the second controller through the second dual-channel digital isolator and the RS485 communication module in sequence when the gas sensor data is received through the main instrument bus interface.

[0039] In one embodiment, the repeater connection end of the main instrument bus interface is connected to the repeater connection end of the second controller;

[0040] The power output terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the master instrument bus interface are used to connect to the slave instrument bus module through a repeater.

[0041] In one embodiment, the alarm control module includes a first electronic switch unit, a second electronic switch unit, a light alarm interface, and a sound alarm interface;

[0042] The first electronic switch unit is respectively connected to the second power module, the second controller and the light alarm interface, and the second electronic switch unit is respectively connected to the second power module, the second controller and the sound alarm interface;

[0043] The light alarm interface is used to connect a light alarm;

[0044] The sound alarm interface is used to connect a sound alarm;

[0045] The second controller is also used to control the first electronic switch unit and the second electronic switch unit to turn on or off according to the gas concentration data;

[0046] The first electronic switch unit is used to trigger the light alarm to emit a light signal when turned on, and to trigger the light alarm to stop emitting a light signal when turned off;

[0047] The second electronic switch unit is used to trigger the sound alarm to emit a sound signal when turned on, and to trigger the sound alarm to stop emitting a sound signal when turned off.

[0048] A third aspect of the embodiments of the present application provides a gas alarm system, comprising at least one gas sensor device as described in the first aspect of the embodiments of the present application and a collector as described in the second aspect of the embodiments of the present application;

[0049] The collector is connected to at least one of the gas sensing devices via an instrument bus;

[0050] Alternatively, the collector is connected to at least one repeater via an instrument bus, and each of the repeaters is connected to at least one of the gas sensor devices.

[0051] The gas sensing device provided in the first aspect of the embodiment of the present application enables the slave instrument bus module to be connected to the main instrument bus module of the collector through a two-wire and non-polar instrument bus, without distinguishing between positive and negative polarities, which can reduce the difficulty of wiring and reduce the number of wirings; by receiving the first power supply signal sent by the main instrument bus module and outputting it to the first power supply module, the slave instrument bus module, the first controller and the gas sensor are powered, and electric energy can be remotely obtained from the collector through the instrument bus, which can effectively reduce maintenance costs; when receiving the request signal sent by the main instrument bus module, the gas concentration data output by the gas sensor is sent to the main instrument bus module through the instrument bus. Since the instrument bus uses a level signal to transmit the gas concentration data (digital signal), it has a strong anti-interference ability, can improve the communication quality and can realize remote transmission.

[0052] The collector provided in the second aspect of the embodiment of the present application enables the main instrument bus module to be connected to the slave instrument bus module of the gas sensor device through the instrument bus, without distinguishing between positive and negative polarities, which can reduce the difficulty of wiring and reduce the number of wirings; by sending a first power supply signal to the slave instrument bus module to power the gas sensor device, the collector can remotely power the gas sensor device through the instrument bus, which can effectively reduce maintenance costs; the second controller controls the main instrument bus module to output a request signal to the slave instrument bus module through the RS485 communication module to obtain the gas concentration data sent by the gas sensor device, and outputs an alarm control signal to the alarm control module according to the gas concentration data, so as to control the alarm to send an alarm signal through the alarm control module, so that the main instrument bus module can be installed independently, which is convenient for production and maintenance.

[0053] It can be understood that the beneficial effects of the third aspect mentioned above can be found in the relevant description of the first aspect or the second aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 This is a schematic diagram of the first structure of the gas sensor device provided in the embodiment of the present application;

[0056] Figure 2 is a structural diagram of a slave instrument bus module provided in an embodiment of the present application;

[0057] Figure 3 is a second structural schematic diagram of the gas sensor device provided in an embodiment of the present application;

[0058] Figure 4 This is a schematic diagram of the first structure of the collector provided in the embodiment of the present application;

[0059] Figure 5 This is a second structural diagram of the collector provided in the embodiment of the present application;

[0060] Figure 6 This is a schematic diagram of the first structure of the gas alarm system provided in the embodiment of the present application;

[0061] Figure 7 This is a second structural diagram of the gas alarm system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0064] The embodiment of the present application provides a gas sensor device, which can be applied to various places such as factories, office buildings, residences, underground parking lots, and biogas pools where gas concentration needs to be detected. The gas sensor device can be specifically used to detect the concentration of various flammable, toxic or harmful gases such as methane, carbon monoxide, and sulfur dioxide, and send the obtained gas concentration data to a collector through a meter bus (MBus). A collector can be connected to at least one gas sensor device to collect gas concentration data sent by the gas sensor device, analyze the gas concentration according to the gas concentration data, and control the alarm to send an alarm signal when the gas concentration exceeds a critical value to prevent explosions, fires or poisoning accidents. The collector can be set in a security monitoring center, security room, and other places far away from the gas sensor device. By remotely communicating with the gas sensor device, remote monitoring of the gas concentration at the place where the gas sensor device is located can be achieved.

[0065] like Figure 1 As shown, the gas sensing device 10 provided in the embodiment of the present application includes a slave instrument bus module 11, a first power module 12, a first controller 13 and a gas sensor 14;

[0066] The slave meter bus module 11, the first controller 13 and the gas sensor 14 are connected in sequence, and the first power supply module 12 is connected to the slave meter bus module 11, the first controller 13 and the gas sensor 14 respectively;

[0067] The slave instrument bus module 11 is used to connect to the master instrument bus module 21 of the collector 20 through the instrument bus 30, receive the first power signal sent by the master instrument bus module 21 and output it to the first power module 12, and when receiving the request signal sent by the master instrument bus module 21, output the request signal to the first controller 13;

[0068] The first power supply module 12 is used to perform voltage conversion on the first power supply signal to supply power to the instrument bus module 11, the first controller 13 and the gas sensor 14;

[0069] The gas sensor 14 is used to detect the gas concentration and output the gas concentration data to the first controller 13;

[0070] The first controller 13 is used to output the gas concentration data to the slave instrument bus module 11 when receiving the request signal;

[0071] The slave instrument bus module 11 is further configured to send the gas concentration data to the master instrument bus module 21 via the instrument bus 30 when receiving the gas concentration data.

[0072] In application, the slave instrument bus module may be composed of an instrument bus transceiver and its peripheral circuits. The instrument bus transceiver may select any device, circuit or chip that can realize its function according to actual needs, for example, a TSS721A instrument bus transceiver.

[0073] like Figure 2 As shown, in one embodiment, the slave meter bus module 11 includes a slave meter bus transceiver 111, a slave meter bus interface 112 and a first dual-channel digital isolator 113;

[0074] The first instrument bus terminal BUSL1, the second instrument bus terminal BUSL2, the data receiving terminal RX, the data transmitting terminal TX and the power supply terminal VDD of the slave instrument bus transceiver 111 are respectively connected to the first instrument bus terminal MBUS+ and the second instrument bus terminal MBUS- of the slave instrument bus interface 112, the first data transmitting terminal VOA and the first data receiving terminal VIB of the first dual-channel digital isolator 113 and the power supply output terminal of the first power supply module 12 in a one-to-one correspondence;

[0075] The power input terminal VDD0 of the slave instrument bus interface 112 is connected to the power input terminal of the first power module 12;

[0076] The first power supply terminal VDD1 and the second power supply terminal VDD2 of the first dual-channel digital isolator 113 are connected to the power output terminal of the first power supply module 12, and the second data receiving terminal VIA and the second data sending terminal VOB of the first dual-channel digital isolator 113 are connected to the data sending terminal and the data receiving terminal of the first controller 13 in a one-to-one correspondence.

[0077] The power input terminal VDD0, the first instrument bus terminal MBUS+ and the second instrument bus terminal MBUS- of the slave instrument bus interface 112 are used to connect to the master instrument bus module 21 via the instrument bus 30;

[0078] The slave instrument bus transceiver 111 is used to output a request signal to the first controller 13 through the first dual-channel digital isolator 113 when a request signal is received through the slave instrument bus interface 112, and is also used to send the gas concentration data to the main instrument bus module 21 through the slave instrument bus interface 112 when the gas concentration data is received through the first dual-channel digital isolator 113.

[0079] In application, the slave instrument bus interface may further include a repeater connection terminal for connecting to a repeater, so that the gas sensor device may be connected to the instrument bus through the repeater. The first dual-channel digital isolator may specifically be a UART (Universal Asynchronous Receiver / Transmitter) signal isolator, for example, an ADUM1201 dual-channel digital isolator. The connection between the slave instrument bus transceiver and the first controller is achieved by a dual-channel digital isolator, so that the slave instrument bus transceiver can be independently installed, which is convenient for production and maintenance.

[0080] In one embodiment, the repeater connection terminal of the slave instrument bus interface is connected to the repeater connection terminal of the first controller;

[0081] The power input terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the slave instrument bus interface are used to connect to the instrument bus through a repeater.

[0082] In the application, a repeater is used to realize the connection between the instrument bus interface and the instrument bus, so that two or more gas sensor devices can be connected in series and then connected to the instrument bus through the repeater, thereby effectively increasing the number of gas sensor devices that can be connected to the collector.

[0083] In the application, the first power module is used to receive the first power signal sent by the collector and convert it into a power signal suitable for the working voltage of each device in the gas sensor device to power each device. The first power module can be implemented by a DC-DC (Direct current-Direct current) step-down device, an LDO (low dropout regulator), etc. The specific type of the first power module is not particularly limited in the embodiment of the present application.

[0084] In one embodiment, the first power module includes a first power conversion unit, a second power conversion unit and a third power conversion unit;

[0085] The power input end of the first power conversion unit and the power input end of the second power conversion unit are connected to the instrument bus module, the power output end of the first power conversion unit is connected to the power input end of the third power conversion unit, the power output end of the second power conversion unit is connected to the gas sensor, and the power output end of the third power conversion unit is connected to the slave instrument bus module and the first controller;

[0086] The first power conversion unit is used to convert the first power signal into a second power signal;

[0087] The third power conversion unit is used to convert the second power signal into a third power signal to supply power to the slave instrument bus module and the first controller;

[0088] The second power conversion unit is used to convert the first power signal into a fourth power signal to supply power to the gas sensor.

[0089] In the application, the first power conversion unit and the second power conversion unit can be implemented by a DC-DC step-down device, and the third power conversion unit can be implemented by an LDO. For example, the first power conversion unit and the second power conversion unit are LM2842 type DC-DC step-down devices, and the third power conversion unit is a TPS76333DBV type LDO. The voltages of the first power signal, the second power signal, the third power signal and the fourth power signal are 24V, 6V, 3.3V and 2.6V respectively.

[0090] like Figure 3 As shown, in one embodiment, the gas sensing device 10 further includes an analog-to-digital converter 15 connected between the first controller 13 and the gas sensor 14 .

[0091] In the application, the analog-to-digital converter can be integrated into the first controller. The first controller can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor (MCU) or the processor can also be any conventional processor, for example, a PIC18F25K22 microprocessor. The analog-to-digital converter is a 16-bit or 24-bit analog-to-digital converter, for example, the ADS1110 type 16-bit high-resolution analog-to-digital converter has an internal reference voltage of 2.048V, an accuracy of ±0.05%, an accuracy of 0.0312mV for converting one voltage signal unit, extremely low temperature drift (5ppm / ℃), a nonlinearity of 0.01%, a power supply voltage of 2.7 to 5.5V, an internal gain adjustment function, an I2C (Inter-Integrated Circuit) communication interface, and is capable of bidirectional serial communication with the processor.

[0092] In applications, the gas sensor may specifically be a highly sensitive combustible gas sensor or a toxic gas sensor, for example, a VQ548MP2-DA combustible gas sensor having a sensitivity of 8 mV / %.

[0093] In one embodiment, the sensitivity of the gas sensor is less than or equal to 8m V / %, and is configured to output a voltage signal less than or equal to 8XmV when the gas concentration is X%, wherein X≥1 and is an integer.

[0094] In application, the smaller the value of the sensitivity of the gas sensor, the higher its sensitivity. For a gas sensor with a sensitivity of 8mV / %, when the detected gas concentration is 1%, the output voltage is 8mV; when the detected gas concentration is 2%, the output voltage is 16mV; when the detected gas concentration is 3%, the output voltage is 24mV; ...; when the detected gas concentration is 60%, the output voltage is 480mV, and so on.

[0095] like Figure 3As shown, in one embodiment, the gas sensor device 10 further includes a first display 16 connected to the first controller 13 and the first power module 12 for displaying gas concentration data.

[0096] In the application, the first display is used to display gas concentration data (specifically, gas concentration) in the form of text (specifically, it can be numbers), graphics or images. The first display can be any type of display, for example, a liquid crystal display based on LCD (Liquid Crystal Display) technology, an organic electroluminesence display based on OLED (Organic Electroluminesence Display) technology, a quantum dot light emitting diode display based on QLED (Quantum Dot Light Emitting Diodes) technology, a seven-segment or eight-segment LED (Light Emitting Diode) digital tube (Segment Displays), etc.

[0097] The gas sensing device provided in the embodiment of the present application connects the slave instrument bus module to the main instrument bus module of the collector through a two-wire and non-polar instrument bus, without distinguishing between positive and negative polarities, thereby reducing the difficulty of wiring and the number of wirings; by receiving the first power supply signal sent by the main instrument bus module and outputting it to the first power supply module, the slave instrument bus module, the first controller and the gas sensor are powered, and electric energy can be remotely obtained from the collector through the instrument bus, which can effectively reduce maintenance costs; by sending the gas concentration data output by the gas sensor to the main instrument bus module through the instrument bus when receiving the request signal sent by the main instrument bus module, since the instrument bus uses a level signal to transmit the gas concentration data (digital signal), it has a strong anti-interference ability, can improve the communication quality and can realize remote transmission.

[0098] like Figure 4 As shown, the embodiment of the present application also provides a collector 20, including a main instrument bus module 21, a second power module 22, an RS485 communication module 23, a second controller 24 and an alarm control module 25;

[0099] The main instrument bus module 21, the RS485 communication module 23, the second controller 24 and the alarm control module 25 are connected in sequence, and the second power supply module 22 is connected to the main instrument bus module 21, the second controller 24 and the alarm control module 25 respectively;

[0100] The second power supply module 22 is used to convert the power supply signal into a first power supply signal and a fifth power supply signal and output them to the main instrument bus module 21, and is also used to convert the first power supply signal into a voltage to supply power to the main instrument bus module 21, the second controller 24 and the alarm control module 25;

[0101] The master instrument bus module 21 is used to connect to the slave instrument bus module 11 of the gas sensor device 10 through the instrument bus 30, and send the first power supply signal to the slave instrument bus module 21 to supply power to the gas sensor device 10;

[0102] The second controller 24 is used to control the main instrument bus module 21 to output a request signal to the slave instrument bus module 11 through the RS485 communication module 23 to obtain the gas concentration data collected by the gas sensor device 10, and output an alarm control signal to the alarm control module 25 according to the gas concentration data;

[0103] The alarm control module 25 is used to connect to the alarm and control the alarm to send out an alarm signal according to the alarm control signal;

[0104] The request signal is composed of the first power signal and / or the fifth power signal.

[0105] In application, the main instrument bus module may be composed of an instrument bus transceiver and its peripheral circuits. The instrument bus transceiver may select any device, circuit or chip that can realize its function according to actual needs, for example, a TSS721A instrument bus transceiver.

[0106] In one embodiment, the main instrument bus module includes a main instrument bus transceiver, a main instrument bus interface, and a second dual-channel digital isolator;

[0107] The first instrument bus terminal, the second instrument bus terminal, the data receiving terminal, the data sending terminal and the power supply terminal of the main instrument bus transceiver are respectively connected with the first instrument bus terminal and the second instrument bus terminal of the main instrument bus interface, the first data sending terminal and the first data receiving terminal of the second dual-channel digital isolator and the power supply output terminal of the second power supply module in a one-to-one correspondence;

[0108] The power output end of the main instrument bus interface is connected to the power output end of the second power module;

[0109] The first power supply terminal and the second power supply terminal of the second dual-channel digital isolator are connected to the power output terminal of the second power supply module, and the second data receiving terminal and the second data sending terminal of the second dual-channel digital isolator are respectively connected to the data sending terminal and the data receiving terminal of the RS485 communication module in a one-to-one correspondence;

[0110] The power output terminal, the first instrument bus terminal and the second instrument bus terminal of the master instrument bus interface are used to connect with the slave instrument bus module through the instrument bus;

[0111] The main instrument bus transceiver is used to send the request signal to the slave instrument bus module through the main instrument bus interface when the request signal is received through the second dual-channel digital isolator, and is also used to output the gas sensor data to the second controller through the second dual-channel digital isolator and the RS485 communication module in sequence when the gas sensor data is received through the main instrument bus interface.

[0112] In the application, the main instrument bus interface may also include a repeater connection terminal for connecting to a repeater so that the collector can be connected to the instrument bus through the repeater. The second dual-channel digital isolator may be a UART signal isolator, for example, an ADUM1201 dual-channel digital isolator. The connection between the slave instrument bus transceiver and the RS485 communication module is realized by a dual-channel digital isolator, so that the main instrument bus transceiver can be installed independently, which is convenient for production and maintenance.

[0113] In one embodiment, the repeater connection end of the main instrument bus interface is connected to the repeater connection end of the second controller;

[0114] The power output terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the master instrument bus interface are used to connect to the slave instrument bus module through a repeater.

[0115] In the application, a repeater is used to realize the connection between the instrument bus interface and the instrument bus, so that two or more gas sensor devices can be connected in series and then connected to the instrument bus through the repeater, thereby effectively increasing the number of gas sensor devices that can be connected to the collector.

[0116] In the application, the second power module is used to access the external power signal and convert it into a power signal suitable for the working voltage of each device in the collector to power each device. The second power module can be implemented by a transformer, a DC-DC (Direct current-Direct current, direct current-direct current) step-down device, an LDO (low dropout regulator, low voltage difference linear regulator), etc., and the specific type of the second power module is not particularly limited in the embodiment of the present application. The request signal is a digital signal, and the voltage magnitudes of the first power signal and the fifth power signal can be 24V and 36V respectively. The logic 0 of the request signal is characterized by the first power signal of 24V, and the logic 1 of the request signal is characterized by the fifth power signal of 34V. The main instrument bus module can switch the output of the 24V and 36V power signals through its internal selection switch. When the main instrument bus module receives the gas concentration data, it collects the current signal on the instrument bus and converts it into a voltage signal, then filters and compares the voltage signal, converts the voltage signal into a digital signal represented by logic 1 and logic 0, and then outputs it to the second controller through the second dual-channel digital isolator and the RS485 communication module.

[0117] In the application, the RS485 communication module is mainly composed of an RS485 communication chip, an RS485 interface and its peripheral circuits. The second dual-channel digital isolator, the RS485 interface, the RS485 communication chip and the second controller are connected in sequence. The RS485 communication chip can be a low-power RS485 communication chip, and specifically, the SN65HVD3082 low-power RS485 communication chip can be selected. By using the RS485 communication module, differential signal transmission can be achieved through only two cables.

[0118] In application, the second controller may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor (MCU) or the processor may be any conventional processor, for example, a PIC18F25K22 microprocessor.

[0119] In one embodiment, the alarm control module includes a first electronic switch unit, a second electronic switch unit, a light alarm interface, and a sound alarm interface;

[0120] The first electronic switch unit is respectively connected to the second power module, the second controller and the light alarm interface, and the second electronic switch unit is respectively connected to the second power module, the second controller and the sound alarm interface;

[0121] The light alarm interface is used to connect a light alarm;

[0122] The sound alarm interface is used to connect a sound alarm;

[0123] The second controller is also used to control the first electronic switch unit and the second electronic switch unit to turn on or off according to the gas concentration data;

[0124] The first electronic switch unit is used to trigger the light alarm to emit a light signal when turned on, and to trigger the light alarm to stop emitting a light signal when turned off;

[0125] The second electronic switch unit is used to trigger the sound alarm to emit a sound signal when turned on, and to trigger the sound alarm to stop emitting a sound signal when turned off.

[0126] In application, the first electronic switch unit and the second electronic switch unit can be realized by an electronic switch tube and its peripheral circuits, and the electronic switch tube can be a transistor, for example, a triode or a field effect tube. The sound alarm can be composed of a buzzer and its peripheral circuits, or a voice chip and a speaker and peripheral circuits, and is used to send out a sound signal under the control of the second controller when the gas concentration reaches a critical value. The light alarm can be composed of a single-color, two-color or multi-color LED lamp and its peripheral circuits, and is used to send out a light signal under the control of the second controller when the gas concentration reaches a critical value.

[0127] like Figure 5 As shown, in one embodiment, the collector 20 further includes a second display 26 connected to the second controller 24 and the second power module 22 for displaying gas concentration data.

[0128] In the application, the second display is used to display the gas concentration data (specifically, the gas concentration size) in the form of text (specifically, it can be numbers), graphics or images. The second display can be any type of display, for example, a liquid crystal display based on LCD (Liquid Crystal Display) technology, an organic electroluminesence display based on OLED (Organic Electroluminesence Display) technology, a quantum dot light emitting diode display based on QLED (Quantum Dot Light Emitting Diodes) technology, a seven-segment or eight-segment LED (Light Emitting Diode) digital tube (Segment Displays), etc.

[0129] The collector provided in the embodiment of the present application enables the main instrument bus module to be connected to the slave instrument bus module of the gas sensor device through the instrument bus, without distinguishing between positive and negative polarities, which can reduce the difficulty of wiring and the number of wirings; by sending a first power supply signal to the slave instrument bus module to power the gas sensor device, the collector can remotely power the gas sensor device through the instrument bus, which can effectively reduce maintenance costs; the second controller controls the main instrument bus module to output a request signal to the slave instrument bus module through the RS485 communication module to obtain the gas concentration data sent by the gas sensor device, and outputs an alarm control signal to the alarm control module according to the gas concentration data, so as to control the alarm to send an alarm signal through the alarm control module, so that the main instrument bus module can be installed independently, which is convenient for production and maintenance.

[0130] like Figure 6 or Figure 7 As shown, an embodiment of the present application further provides a gas alarm system, comprising at least one gas sensor device 10 and a collector 20 .

[0131] In application, the collector is connected to at least one gas sensor device via an instrument bus; or, the collector is connected to at least one repeater via an instrument bus, and each repeater is connected to at least one gas sensor device. The number of gas sensors and repeaters is determined according to the networking requirements of the gas alarm system.

[0132] Figure 6 The collector 20 is shown as being connected to a plurality of gas sensing devices 10 via an instrument bus 30 ;

[0133] Figure 7 It is exemplarily shown that the collector 20 is connected to a plurality of repeaters 40 via an instrument bus 30 , and each repeater 40 is connected to a plurality of gas sensor devices 10 .

[0134] The gas alarm system provided in the embodiment of the present application realizes bus-type topology networking between the gas sensor device and the collector through the instrument bus, which is convenient for network expansion and has low networking cost. In addition, the failure of any gas sensor device will not affect the transmission function of the entire instrument bus, and the system has good stability.

[0135] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A gas sensing device, characterized in that: It includes a slave instrument bus module, a first power module, a first controller, a gas sensor and a first display; The slave instrument bus module, the first controller and the gas sensor are connected in sequence, and the first power supply module is connected to the slave instrument bus module, the first controller and the gas sensor respectively; The slave instrument bus module is used to connect to the master instrument bus module of the collector through the instrument bus, receive the first power signal sent by the master instrument bus module and output it to the first power module, and when receiving the request signal sent by the master instrument bus module, output the request signal to the first controller; The first power supply module is used to perform voltage conversion on the first power supply signal to supply power to the slave instrument bus module, the first controller and the gas sensor; The gas sensor is used to detect gas concentration and output gas concentration data to the first controller; The first controller is used to output the gas concentration data to the slave instrument bus module when receiving the request signal; The slave instrument bus module is further used for sending the gas concentration data to the master instrument bus module via the instrument bus when receiving the gas concentration data; The slave instrument bus module includes a slave instrument bus transceiver, a slave instrument bus interface and a first dual-channel digital isolator; The first instrument bus terminal, the second instrument bus terminal, the data receiving terminal, the data sending terminal and the power supply terminal of the slave instrument bus transceiver are respectively connected with the first instrument bus terminal and the second instrument bus terminal of the slave instrument bus interface, the first data sending terminal and the first data receiving terminal of the first dual-channel digital isolator and the power supply output terminal of the first power supply module in a one-to-one correspondence; The power input terminal of the slave instrument bus interface is connected to the power input terminal of the first power module; The first power supply terminal and the second power supply terminal of the first dual-channel digital isolator are connected to the power output terminal of the first power module, and the second data receiving terminal and the second data sending terminal of the first dual-channel digital isolator are respectively connected to the data sending terminal and the data receiving terminal of the first controller in a one-to-one correspondence; The power input terminal, the first instrument bus terminal and the second instrument bus terminal of the slave instrument bus interface are used to connect to the master instrument bus module through the instrument bus; The slave instrument bus transceiver is used to output the request signal to the first controller through the first dual-channel digital isolator when the request signal is received through the slave instrument bus interface, and is also used to send the gas concentration data to the master instrument bus module through the slave instrument bus interface when the gas concentration data is received through the first dual-channel digital isolator; The first power module includes a first power conversion unit, a second power conversion unit and a third power conversion unit; The power input end of the first power conversion unit and the power input end of the second power conversion unit are connected to the instrument bus module, the power output end of the first power conversion unit is connected to the power input end of the third power conversion unit, the power output end of the second power conversion unit is connected to the gas sensor, and the power output end of the third power conversion unit is connected to the slave instrument bus module and the first controller; The first power conversion unit is used to convert the first power signal into a second power signal; The third power conversion unit is used to convert the second power signal into a third power signal to supply power to the slave instrument bus module and the first controller; The second power conversion unit is used to convert the first power signal into a fourth power signal to power the gas sensor; The first display is connected to the first controller and the first power module, and is used to display the gas concentration data.

2. The gas sensor device according to claim 1, characterized in that: The repeater connection end of the slave instrument bus interface is connected to the repeater connection end of the first controller; The power input terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the slave instrument bus interface are used to connect to the instrument bus through a repeater.

3. A collector, characterized in that: It includes a main instrument bus module, a second power supply module, an RS485 communication module, a second controller and an alarm control module; The main instrument bus module, the RS485 communication module, the second controller and the alarm control module are connected in sequence, and the second power supply module is connected to the main instrument bus module, the second controller and the alarm control module respectively; The second power supply module is used to convert the power supply signal into a first power supply signal and a fifth power supply signal and output them to the main instrument bus module, and is also used to convert the first power supply signal into a voltage to supply power to the main instrument bus module, the second controller and the alarm control module; The master instrument bus module is used to connect to the slave instrument bus module of the gas sensor device through the instrument bus, and send the first power supply signal to the slave instrument bus module to supply power to the gas sensor device; The second controller is used to control the main instrument bus module to output a request signal to the slave instrument bus module through the RS485 communication module to obtain the gas concentration data collected by the gas sensor device, and output an alarm control signal to the alarm control module according to the gas concentration data; The alarm control module is used to connect to the alarm and control the alarm to send out an alarm signal according to the alarm control signal; Wherein, the request signal is composed of the first power signal and / or the fifth power signal; The main instrument bus module includes a main instrument bus transceiver, a main instrument bus interface, a second dual-channel digital isolator and a second display; The first instrument bus terminal, the second instrument bus terminal, the data receiving terminal, the data sending terminal and the power supply terminal of the main instrument bus transceiver are respectively connected with the first instrument bus terminal and the second instrument bus terminal of the main instrument bus interface, the first data sending terminal and the first data receiving terminal of the second dual-channel digital isolator and the power supply output terminal of the second power supply module in a one-to-one correspondence; The power output end of the main instrument bus interface is connected to the power output end of the second power module; The first power supply terminal and the second power supply terminal of the second dual-channel digital isolator are connected to the power output terminal of the second power supply module, and the second data receiving terminal and the second data sending terminal of the second dual-channel digital isolator are respectively connected to the data sending terminal and the data receiving terminal of the RS485 communication module in a one-to-one correspondence; The power output terminal, the first instrument bus terminal and the second instrument bus terminal of the master instrument bus interface are used to connect with the slave instrument bus module through the instrument bus; The master instrument bus transceiver is used to send the request signal to the slave instrument bus module through the master instrument bus interface when the request signal is received through the second dual-channel digital isolator, and is also used to output the gas sensor data to the second controller through the second dual-channel digital isolator and the RS485 communication module in sequence when the gas sensor data is received through the master instrument bus interface; The repeater connection end of the main instrument bus interface is connected to the repeater connection end of the second controller; The power output terminal, the first instrument bus terminal, the second instrument bus terminal and the repeater connection terminal of the master instrument bus interface are used to connect to the slave instrument bus module through a repeater; The second display is connected to the second controller and the second power module, and is used for displaying the gas concentration data.

4. The collector according to claim 3, characterized in that: The alarm control module includes a first electronic switch unit, a second electronic switch unit, a light alarm interface and a sound alarm interface; The first electronic switch unit is respectively connected to the second power module, the second controller and the light alarm interface, and the second electronic switch unit is respectively connected to the second power module, the second controller and the sound alarm interface; The light alarm interface is used to connect a light alarm; The sound alarm interface is used to connect a sound alarm; The second controller is also used to control the first electronic switch unit and the second electronic switch unit to turn on or off according to the gas concentration data; The first electronic switch unit is used to trigger the light alarm to emit a light signal when turned on, and to trigger the light alarm to stop emitting a light signal when turned off; The second electronic switch unit is used to trigger the sound alarm to emit a sound signal when turned on, and to trigger the sound alarm to stop emitting a sound signal when turned off.

5. A gas alarm system, characterized in that: Comprising at least one gas sensing device as claimed in claim 1 or 2 and a collector as claimed in claim 3 or 4; The collector is connected to at least one of the gas sensing devices via an instrument bus; Alternatively, the collector is connected to at least one repeater via an instrument bus, and each of the repeaters is connected to at least one of the gas sensor devices.

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