CN216926762U

CN216926762U - Sensor-replaceable multi-parameter gas detection hardware system

Info

Publication number: CN216926762U
Application number: CN202220381164.3U
Authority: CN
Inventors: 崔冠; 郑黎明; 董旭毅
Original assignee: Shenzhen Korno Electronic Technology Co ltd
Current assignee: Shenzhen Korno Electronic Technology Co ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-07-08
Anticipated expiration: 2032-02-24

Abstract

The utility model discloses a sensor-replaceable multi-parameter gas detection hardware system, which comprises an air pump and a host; an ADC (analog-to-digital converter), four detection units and four gas channels corresponding to the detection units are arranged in the host; the surface of the main machine is provided with four channel openings which are communicated with the gas channels one by one; each detection unit comprises two sensors, a detection circuit of each sensor and a sensor output signal selection circuit, and each sensor is connected with the sensor output signal selection circuit through the detection circuit of each sensor; the same detection unit adopts two different sensors, and different detection units adopt two different sensor combinations; the sensor output signal selection circuits are connected with the ADC, the ADC is connected with the single chip microcomputer, the single chip microcomputer is connected with the sensor output signal selection circuits, and gating signals are sent to the sensor output signal selection circuits to control gating of the two sensors in each detection unit, so that various sensor combinations are realized, and detection is more comprehensive and convenient.

Description

Sensor-replaceable multi-parameter gas detection hardware system

Technical Field

The utility model relates to a sensor-replaceable multi-parameter gas detection hardware system, in particular to a sensor-replaceable multi-parameter gas detection hardware system.

Background

At present, inflammable and explosive, poisonous and harmful gas detection's application scope is more and more extensive nowadays, like enterprises such as coal mine gallery, underground pipe gallery, special chemical production, all provide timely early warning mechanism for avoiding the emergence of major production accident, have adopted following equipment:

1. a single portable gas detection device that provides single gas detection depending on the application, for example: carbon monoxide, hydrogen sulfide, sulfur hexafluoride, and the like. However, the device can only be used in certain situations, for example, a certain chemical manufacturer only produces one gas to be detected during the production process. The use requirements can be met only by purchasing a plurality of devices, and the purchase cost and the maintenance difficulty of the user are increased.

2. A portable gas detecting apparatus of the multi-parameter diffusion type provides two to six different types of gas detection according to the use situation, and the gas to be detected is supplied to a sensor by natural diffusion or pumping. However, the sensor for detecting gas is fixed, only a designated gas combination can be detected, different devices need to be purchased for different application scenes, and the number of types subdivided by manufacturers during production is too many, which increases the complexity of production management.

Therefore, a novel gas detector capable of meeting the requirement of simultaneously detecting multiple gases is urgently needed to be researched and designed.

Disclosure of Invention

Aiming at the existing technical problems, the utility model provides a multi-parameter gas detection hardware system with replaceable sensors, which realizes the combination of various sensors by replacing the sensors so as to better meet the application requirements of most scenes.

In order to achieve the aim, the utility model provides a multi-parameter gas detection hardware system with replaceable sensors, which comprises a gas pump and a host;

the host is internally provided with a lithium battery, a singlechip, a data memory, an ADC (analog to digital converter), four detection units and four gas channels corresponding to the detection units one by one; the surface of the main machine is provided with a display, keys and four channel openings which are communicated with the gas channels one by one;

each detection unit comprises two sensors, a detection circuit of the sensors and a sensor output signal selection circuit, and various sensors are connected with the sensor output signal selection circuit through the detection circuits of the sensors; the same detection unit adopts two different sensors, and different detection units adopt two different sensor combinations;

the sensor output signal selection circuit of each detection unit is respectively connected with an ADC (analog to digital converter), and the ADC, the data memory, the display, the key, the lithium battery and the air pump are respectively connected with the single chip microcomputer;

and the singlechip is respectively connected with the sensor output signal selection circuits of the detection units, and controls the gating of the output signals of the two sensor detection circuits in each detection unit by sending gating signals to the sensor output signal selection circuits.

According to the technical scheme, the gas detection hardware system comprises 8 sensor detection circuits, every two sensor detection circuits form a detection unit, under the action of a gating signal of the single chip microcomputer, each detection unit selects two sensors through a sensor output signal selection circuit, so that 8 paths of sensor signals are changed into 4 paths of sensor signals, the 4 paths of sensor signals enter an ADC (analog-to-digital converter) for sampling, and detection data are sent to the single chip microcomputer. And because the same detection unit adopts two different sensors, and different detection units adopt different sensor combinations, the gas detection hardware system can select various sensor combinations according to the field conditions, so that the gas detection range is more comprehensive, the operation is more convenient and faster, and the result is more accurate.

Further, the host computer still be equipped with alarm lamp, bee calling organ and vibrations motor, and alarm lamp, bee calling organ and vibrations motor are connected the singlechip respectively.

Furthermore, the sensor adopts an electrochemical sensor, an infrared sensor, a catalytic combustion sensor or a photo-ion sensor.

The electrochemical sensor is used for detecting CO and H by selecting specific types as a sensor for detecting electrochemistry₂S、HO₂、SO₂、NO、NO₂And the like. The advantages are that: low power consumption, high precision, high sensitivity, excellent repeatability and stability; the disadvantages are that: other gases interfere and have short service life.

Catalytic combustion sensor for detecting CH₄、CH₃CH₃And, CH₃CH₂CH₃And the like. The advantages are that: the metering is accurate, the response is quick, and the service life is long; the disadvantages are that: in the combustible gas range, there is no selectivity. The hidden fire works, there is a danger of igniting explosion, and oxygen must exist.

The infrared sensor adopts non-dispersive infrared gas detection technology, and can be used for detecting CO and CO by selecting specific models₂、H₂S、CH₄、SF₆And the like. The advantages are that: the precision is high, the gas sensor is not easily interfered by other gases, and the gas sensor can stably work for a long time; the disadvantages are that: the cost is high.

The light ion sensor adopts the gaseous mode of ultraviolet ray ionization to detect volatile organic compound gas, includes: aromatics, ketones, aldehydes, amines, amino compounds, unsaturated hydrocarbons, and the like. The advantages are that: the detection precision is high; the disadvantages are that: the gas species cannot be distinguished, and the gas species should be known first, and then the quantitative test should be performed.

According to the technical scheme, the same detection unit adopts two different sensors, and each sensor can subdivide the sensors for detecting different gases, such as: the electrochemical sensor can be specifically selected to be a carbon monoxide sensor and matched with an electrochemical detection circuit, so that the gas detection hardware system can detect specific four different gases simultaneously.

Specifically, the electrochemical sensor adopts CO and H₂S、HO₂、SO₂、NO、NO₂One of the sensors.

Specifically, the photoion sensor adopts one of aromatic, ketone, aldehyde, amine, amino compound and unsaturated hydrocarbon sensors.

Specifically, the catalytic combustion sensor adopts CH₄、CH₃CH₃、CH₃CH₂CH₃One of the sensors.

Specifically, the infrared sensor adopts CO and CO₂、H₂S、CH₄、SF₆One of the sensors.

Preferably, the sensor output signal selection circuit adopts a chip with the model number of ADG 333A.

Preferably, the ADC analog-to-digital converter is a four-channel 24-bit resolution serial analog-to-digital converter. The ADC can sample the analog signal input of the four detection units respectively, and then sends the converted 4-path sensor data to the single chip microcomputer in a digital interface IIC mode.

Preferably, the single chip microcomputer adopts a 32-bit single chip microcomputer.

In conclusion, the gas composition detection device can judge the gas composition needing to be detected on site firstly in different use environments, and then different sensor combinations are installed for detection. Therefore, the gas detection system not only integrates the advantages of various sensors, but also can detect whether toxic, harmful, flammable and explosive gases, volatile gases and the content of the gases more comprehensively and more quickly, and is particularly suitable for emergency monitoring of dangerous gases on the disaster site under unknown conditions.

Compared with the prior art, the utility model has the following technical advantages:

1. the combination of sensors of the individual detection cells, as well as the sensor type of each detection cell, may be selected based on the actual situation and the particular gas component to be detected, thereby enabling the present gas detection system to accurately detect a particular gas component.

2. This gas detection system can select multiple sensor combination, detects four kinds of different gases and content simultaneously for detection range is more comprehensive, and the operation is more convenient.

3. The gas detection system has multiple functions of screen display information, intelligent man-machine interaction, acousto-optic vibration alarm and the like, so that the operation is more intelligent and simple.

Drawings

FIG. 1 is an electrical schematic block diagram of the present invention;

FIG. 2 is an electrical schematic block diagram of a detection unit of the present invention;

FIG. 3 is a circuit diagram of the electrochemical detection of the present invention;

FIG. 4 is a circuit diagram of the infrared detection circuit of the present invention;

FIG. 5 is a circuit diagram of a photoion detection of the present invention;

FIG. 6 is a circuit diagram of a catalytic combustion detection circuit according to the present invention;

FIG. 7 is a circuit diagram of a sensor output signal selection circuit according to the present invention;

FIG. 8 is a circuit diagram of an ADC according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained below by combining the specific drawings.

As shown in FIG. 1, the present invention provides a sensor-replaceable multi-parameter gas detection hardware system, which comprises a gas pump and a host. The host is internally provided with a lithium battery, a singlechip, a data memory, an ADC (analog to digital converter), four detection units, four gas channels, an alarm lamp, a buzzer and a vibration motor, wherein the four detection units correspond to the four detection units one by one; the surface of the main machine is provided with a display, a key and four channel openings which are communicated with the gas channels one by one.

And the air pump, the lithium battery, the data memory, the display, the key, the alarm lamp, the buzzer and the vibrating motor are respectively connected with the singlechip. Wherein the air pump can suck the gas to be detected into the four passage openings so as to contact the sensors in the four detection units. The lithium battery can be connected with a USB charging seat and provides a power supply for the system. The data storage can store historical data and alarm data and provide data support for subsequent analysis. The display screen can display the name, concentration value, alarm information, historical record and the like of the currently detected gas. The keys and the display screen are matched to establish a good man-machine interaction interface, and configuration information of sensors in all detection units can be set. The alarm lamp, the buzzer and the vibration motor can give out sound-light alarm and vibration when the singlechip detects that the gas concentration exceeds a set alarm value.

As shown in fig. 2, each detection unit includes two sensors and their detection circuits, and a sensor output signal selection circuit, and the various sensors are connected to the sensor output signal selection circuit through their detection circuits; and the same detection unit adopts two different sensors, and different detection units adopt two different sensor combinations. The sensor output signal selection circuits of the detection units are respectively connected with an ADC (analog-to-digital converter), the ADC is connected with a single chip microcomputer, the single chip microcomputer is respectively connected with the sensor output signal selection circuits of the detection units, and the gating of the output signals of the two sensor detection circuits in each detection unit is controlled by sending gating signals to the sensor output signal selection circuits.

For example: as shown in fig. 1, the surface of the main machine is provided with a first channel opening, a second channel opening, a third channel opening and a fourth channel opening, the surface of the main machine is provided with a liquid crystal display and a key, and the main machine is internally provided with a single chip microcomputer, a memory, a lithium battery, an alarm lamp, a buzzer, a vibration motor, a first gas channel, a second gas channel, a third gas channel, a fourth gas channel and a first detection unit, a second detection unit, a third detection unit and a fourth detection unit which are in one-to-one correspondence with the first gas channel, the second gas channel, the third gas channel and the fourth gas channel.

The first detection unit adopts an electrochemical sensor and an infrared sensor, and the electrochemical sensor and the infrared sensor are respectively connected with a first sensor output signal selection circuit through an electrochemical detection circuit and an infrared detection circuit.

The second detection unit adopts an electrochemical sensor and a light ion sensor, and the electrochemical sensor and the light ion sensor are respectively connected with a second sensor output signal selection circuit through an electrochemical detection circuit and a light ion detection circuit.

The third detection unit adopts an electrochemical sensor and a catalytic combustion sensor, and the electrochemical sensor and the catalytic combustion sensor are respectively connected with a sensor output signal selection circuit III through an electrochemical detection circuit and a catalytic combustion detection circuit.

The fourth detection unit adopts a catalytic combustion sensor and an infrared sensor, and the catalytic combustion sensor and the infrared sensor are respectively connected with a sensor output signal selection circuit IV through a catalytic combustion detection circuit and an infrared detection circuit.

In practice, the electrochemical sensor selects CO and H₂S、HO₂、SO₂、NO、NO₂One of the sensors; selecting CO and CO by infrared sensor₂、H₂S、CH₄、SF₆One of the sensors; the light ion sensor selects one of aromatic, ketone, aldehyde, amine, amino compound and unsaturated hydrocarbon sensor; selecting CH for catalytic combustion sensor₄、CH₃CH₃、CH₃CH₂CH₃One of the sensors. And each sensor is one of more sensors, and only one sensor can be installed in the circuit board. One of the sensors of the same type can be selected according to actual requirements, such as: the electrochemical sensor of the first detection unit can be selected from CO and H₂S、HO₂、SO₂、NO、NO₂One of the sensors is selected to be installed on the sensor interface.

The electrochemical detection circuit, the infrared detection circuit, the photoion detection circuit and the catalytic combustion detection circuit are different and respectively adopt the prior art as shown in figures 3-6.

The sensor output signal selection circuits I, II, III and IV all adopt the prior art as shown in FIG. 7, preferably adopt chips with the model number of ADG333A, and the chips have the function of selecting one from two, and can convert 8-path sensors into 4-path sensors under the action of a single chip microcomputer.

The ADC analog-to-digital converter adopts a four-channel serial analog-to-digital converter with 24-bit resolution, and the resolution and the linearity of the ADC analog-to-digital converter can both guarantee the precision requirement of a single chip microcomputer on collected signals. The preferred type is ADS122C04IPW, and as shown in fig. 8, in the prior art, the ADC chip is a four-way analog signal input, and can sample the analog signal inputs of four detection units, and then send the converted data of the 4-way sensor to the single chip via the digital interface IIC.

The single chip microcomputer adopts a 32-bit single chip microcomputer, preferably an STM32F412RET6 model, and performs signal acquisition, data calculation, display control and alarm control.

The specific operation steps of the utility model during working are as follows:

first, one of the first, second, third, and fourth detecting units is selected on a menu of the liquid crystal display. Such as: a first detection unit is selected.

Second, in the current detection unit, a sensor type is selected. Such as: the sensor type of the first detection unit employs an electrochemical sensor and an infrared sensor, and the electrochemical sensor can be selected. In the current sensor type, a sensor that detects a certain gas is selected. Such as: the electrochemical sensor comprises CO and H₂S、SO₂Sensors, etc., CO sensors may be selected. Four detection units are thus set.

Furthermore, as shown in fig. 2, according to the actual installation condition of the sensor in the system, the single chip microcomputer sends a control signal to each sensor output signal selection circuit. In each detection unit, the weak signals output by two different sensors respectively output analog voltage signals through corresponding detection circuits, the voltage signal of one sensor is transmitted to an ADC through a sensor output signal selection circuit, then is transmitted to a single chip microcomputer through the ADC, and the single chip microcomputer performs numerical calculation to obtain the gas concentration value detected by the sensor.

In addition, when the sensors of all the detection units are replaced, corresponding selection is carried out on the menu of the liquid crystal display screen according to the actually installed sensors, and the steps are repeated.

Moreover, because every detecting element can select the sensor of two kinds of different grade types, every type sensor can also further select the sensor of multiple different gaseous of detection, so a detecting element can detect two kinds of different gases, four detecting elements can have multiple sensor combination mode, just can realize detecting different gaseous components simultaneously, can satisfy the application demand of most environment basically, and detection range is comprehensive, and is easy and simple to handle, swift.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A sensor-replaceable multi-parameter gas detection hardware system is characterized by comprising a gas pump and a host;

2. The replaceable multi-parameter gas detection hardware system of claim 1, wherein the host is further provided with an alarm lamp, a buzzer and a vibration motor, and the alarm lamp, the buzzer and the vibration motor are respectively connected with the single chip microcomputer.

3. The sensor-replaceable multiparameter gas detection hardware system of claim 1, wherein said sensor is an electrochemical sensor, an infrared sensor, a catalytic combustion sensor, or a photo-ionic sensor.

4. The sensor-replaceable multiparameter gas detection hardware system of claim 3, wherein said electrochemical sensor employs CO, H₂S、HO₂、SO₂、NO、NO₂One of the sensors.

5. The sensor-replaceable multiparameter gas detection hardware system of claim 3, wherein said photoion sensor is one of an aromatic, ketone, aldehyde, amine, amide, unsaturated hydrocarbon sensor.

6. The sensor-replaceable multiparameter gas detection hardware system of claim 3, wherein said catalytic combustion sensor employs CH₄、CH₃CH₃、CH₃CH₂CH₃One of the sensors.

7. The sensor-replaceable multiparameter gas detection hardware system of claim 3, wherein said infrared sensor employs CO, CO₂、H₂S、CH₄、SF₆One of the sensors.

8. The replaceable multiparameter gas detection hardware system of one of claims 1-7, wherein said sensor output signal selection circuit is a chip of type ADG 333A.

9. The sensor-replaceable multiparameter gas detection hardware system according to any one of claims 1 to 7, wherein said ADC analog-to-digital converter is a four-channel 24-bit resolution serial analog-to-digital converter.

10. The replaceable sensor multiparameter gas detection hardware system as claimed in any one of claims 1 to 7, wherein the single chip microcomputer employs a 32-bit single chip microcomputer.