CN210051720U

CN210051720U - Device for online monitoring data of flue gas

Info

Publication number: CN210051720U
Application number: CN201920645117.3U
Authority: CN
Inventors: 岳伟
Original assignee: Sichuan Yunhua Sichuan Technology Co Ltd
Current assignee: Sichuan Yunhua Sichuan Technology Co Ltd
Priority date: 2019-05-07
Filing date: 2019-05-07
Publication date: 2020-02-11
Anticipated expiration: 2029-05-07

Abstract

The utility model provides a device for online monitoring data of flue gas, which comprises a cavity and a base, wherein the cavity is connected with the base through a support rod, the cavity comprises a threaded cover, the threaded cover is provided with a plurality of air vents, a gas sensor, an amplifying circuit, a voltage stabilizing module, a first analog-to-digital conversion module and a power module are arranged in the cavity, the output end of the gas sensor is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage stabilizing module; the amplifying circuit comprises a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein the first operational amplifier and the second operational amplifier are symmetrically arranged, zero drift generated by the first operational amplifier and the second operational amplifier can be mutually offset, and then the output ends of the first operational amplifier and the second operational amplifier are respectively connected with the input end of the third operational amplifier to form a linear amplifying circuit, so that a circuit system is more stable.

Description

Device for online monitoring data of flue gas

Technical Field

The utility model relates to a gaseous detection area, concretely relates to flue gas on-line monitoring data's device.

Background

The carbon monoxide detector is a high-brightness liquid crystal indicator, and can be flexibly configured into gas detection instruments of various gas sensors. The instrument can continuously detect the concentration of toxic gas, oxygen and flammable and explosive gas and observe the concentration value of the existing gas at any time. It is widely used in petroleum, chemical, coal mine, metallurgy, paper making, fire fighting, municipal, telecommunication, food, textile and other industries.

Along with the progress of science and technology, carbon monoxide detector also is developing constantly, and we need test the carbon monoxide concentration in the place that the temperature is higher many times, and carbon monoxide detector of prior art interference killing feature is poor, and amplifier module is because the influence of temperature, pressure easily produces zero drift and leads to carbon monoxide detector job instability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome among the prior art carbon monoxide detector appearance and easily receive the temperature, the influence of pressure, produce drift easily and lead to carbon monoxide detector appearance job stabilization.

The purpose of the utility model is realized through the following technical scheme: a device for online monitoring data of flue gas comprises a base and a cavity arranged on the base, and is characterized in that a gas sensor, an amplifying circuit, a voltage stabilizing module, a first analog-to-digital conversion module and a power module are arranged in the cavity, the power module is electrically connected with the gas sensor, the output end of the gas sensor is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage stabilizing module; the amplifying circuit comprises a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein the first operational amplifier and the second operational amplifier form a positive feedback amplifying circuit, the first operational amplifier and the second operational amplifier are symmetrically arranged, the output end of the first operational amplifier is connected with the same-direction input end of the third operational amplifier, and the output end of the second operational amplifier is connected with the reverse-direction input end of the third operational amplifier.

Through the technical means, carbon monoxide gas in the air contacts the gas sensor to carry out chemical reaction to generate current, the current value and the concentration of the carbon monoxide are in a linear relation, the current is linearly amplified through the amplifying circuit and the voltage stabilizing module, and the amplified current is converted into a digital signal through the analog-to-digital conversion module. The first operational amplifier and the second operational amplifier are symmetrically arranged, zero drift generated by the first operational amplifier and the second operational amplifier can be mutually offset, so that the aim of reducing the zero drift is fulfilled, and then the output end is connected with the input end of the third operational amplifier, so that a circuit system is more stable.

Preferably, a drying layer matched with the threaded cover is further arranged between the threaded cover and the gas sensor, a drying agent is filled in the drying layer, and a plurality of through holes are formed in the upper surface and the lower surface of the drying layer.

Through the technical means, the drying layer is used for absorbing water vapor in the air, and the influence of the water vapor on the concentration of carbon monoxide is reduced.

Preferably, a first capacitor is arranged between the non-inverting input end and the output end of the first operational amplifier, and a second capacitor is arranged between the non-inverting input end and the output end of the second operational amplifier.

Through the technical means, the first capacitor and the second capacitor are arranged to weaken high-frequency noise.

Preferably, the surface of the cavity is provided with an electronic display screen, the cavity is also internally provided with a second analog-to-digital conversion module, the voltage signal acquired by the gas sensor is controlled by the second analog-to-digital conversion module through AT89S51 to obtain a digital voltage signal, and the digital voltage signal is displayed through the display screen.

Through the technical means, the concentration of the carbon monoxide is displayed through a 51 single-chip microcomputer control electronic display screen, so that an operator can observe conveniently.

Preferably, the system further comprises a wireless transmission module, and the wireless transmission module is used for transmitting the carbon monoxide concentration to the client for real-time monitoring.

Through above-mentioned technique hand end, set up wireless transmission module for carbon monoxide data carries out real-time detection to carbon monoxide concentration under the inconvenient condition of carrying out limited transmission.

Preferably, the wireless transmission module includes a microprocessor, a second terminal module and a first terminal module, the microprocessor is connected to the output end of the second analog-to-digital conversion module and is used for controlling the second terminal module and the first terminal module, and the microprocessor is AT89C 52.

Through the technical means, the AT89C52 single-chip microcomputer is used as the controller, so that the power consumption is low, the function is strong, and the expandability is strong.

Preferably, the first terminal module comprises a first PTR2000, and the output terminal of the AT89C52 is connected to the input terminal of the first PTR 2000; the second terminal module comprises a second PTR2000, and serial input DI and output DO pins of the second PTR2000 are connected with a serial port of the PC through MAX 2000.

Through the technical means, the PTR2000 is used for receiving and sending the wireless transmission module, so that the number of peripheral elements is small, the working frequency is stable, and the anti-interference capability is strong.

Preferably, the support rod is an electric push rod.

Through above-mentioned technical means, set up the bracing piece into electric putter for the bracing piece is collapsible, extension, and is convenient using the utility model discloses the instrument distance can carry out when not enough and detect through extending the bracing piece, also conveniently carries when the shrink bracing piece.

The utility model has the advantages that:

1. the utility model discloses an amplifier circuit includes first operational amplifier, second operational amplifier and third operational amplifier, first operational amplifier with second operational amplifier all constitutes positive feedback amplifier circuit, first operational amplifier with second operational amplifier symmetry sets up, and the feedback circuit parameter that constitutes separately is the same, first operational amplifier the syntropy input of third operational amplifier is connected, second operational amplifier's output with third operational amplifier's reverse input is connected, through with first operational amplifier with second operational amplifier symmetry sets up, and the drift of zero point of production can offset each other, reduces the drift of zero point and is connected the output with third operational amplifier's input again, makes circuit system more stable.

2. The utility model discloses a wireless transmission module, AT89C52 is adopted to the controller, low-power consumption, powerful, and scalability is strong, and first terminal module includes first PTR2000, AT89C 52's output and first PTR 2000's input are connected; the second terminal module comprises a second PTR2000, serial input DI and output DO pins of the second PTR2000 are connected with a serial port of the PC through MAX2000, and the second PTR2000 has few peripheral elements, stable working frequency and strong anti-interference capability.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a diagram of the connection relationship of the amplifying circuit of the present invention;

FIG. 3 is a schematic diagram of the connection of the first terminal module single chip microcomputer of the present invention;

fig. 4 is a configuration diagram of a second terminal module port of the present invention;

fig. 5 is a schematic diagram of an embodiment of the present invention.

In the figure: 1. a base; 2. a support bar; 3. a cavity; 4. a threaded cap; 5. drying the layer; 6. an electronic display screen; 7. a gas sensor; 8. and (4) a vent hole.

Detailed Description

The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

Example 1

As shown in fig. 1, a device for online monitoring data of flue gas comprises a base 1 and a cavity 3 arranged on the base, and is characterized in that a gas sensor 7, an amplifying circuit, a voltage stabilizing module, a first analog-to-digital conversion module and a power module are arranged in the cavity 3, the power module is electrically connected with the gas sensor 7, the output end of the gas sensor 7 is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage stabilizing module;

the amplifying circuit comprises a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein the first operational amplifier and the second operational amplifier form a positive feedback amplifying circuit, the first operational amplifier and the second operational amplifier are symmetrically arranged, the output end of the first operational amplifier is connected with the same-direction input end of the third operational amplifier, and the output end of the second operational amplifier is connected with the reverse-direction input end of the third operational amplifier.

The carbon monoxide gas in the air contacts the gas sensor to carry out chemical reaction to generate current, the current value is in linear relation with the concentration of the carbon monoxide, the current is linearly amplified through the amplifying circuit and the voltage stabilizing module, the voltage stabilizing module can use a voltage stabilizing circuit formed by LM7805 three-terminal voltage stabilization and a peripheral circuit thereof, the amplified current is converted into a digital signal through the analog-to-digital conversion module, the alarm module can be connected with the alarm module after the first digital-to-analog conversion module and used for driving the alarm module to give an alarm, the alarm module can be composed of a KD9561 chip and a loudspeaker, the first operational amplifier and the second operational amplifier are symmetrically arranged, the parameters of the feedback circuits formed by the first operational amplifier and the second operational amplifier are the same, and the generated zero drift can be mutually offset, so that the purpose of reducing the zero drift is achieved, and then the.

Still be provided with between screw cap 4 and the gas sensor 7 with screw cap 4 complex drying layer 5, the inside drier that is equipped with of drying layer 5, the upper surface and the lower surface of drying layer 5 all are provided with a plurality of through-holes, and drying layer 5 is arranged in absorbing the vapor in the air, reduces the influence of vapor to carbon monoxide concentration.

As shown in fig. 2, the amplifying circuit includes a first operational amplifier U1, a second operational amplifier U2, and a third operational amplifier U3, each of the first operational amplifier U1 and the second operational amplifier U2 forms a positive feedback amplifying circuit, the first operational amplifier U1 and the second operational amplifier U2 are symmetrically disposed, the first operational amplifier U1 is connected to a non-inverting input terminal of the third operational amplifier, and an output terminal of the second operational amplifier is connected to an inverting input terminal of the third operational amplifier. The first operational amplifier U1 and the second operational amplifier U2 are symmetrically arranged to form a differential operational amplifier, so that zero drift is effectively reduced, and then the output ends of the first operational amplifier U1 and the second operational amplifier U2 are respectively connected with the input end of the third operational amplifier U3, so that a circuit system is more stable. A first capacitor C1 is arranged between the homodromous input end and the output end of the first operational amplifier U1, and a second capacitor C2 is arranged between the non-inverting input end and the output end of the second operational amplifier U2. The first capacitor C1 and the second capacitor C2 are provided to attenuate high frequency noise.

The surface of the cavity 3 is provided with an electronic display screen 6, a second analog-to-digital conversion module is further arranged in the cavity 3, the voltage signal acquired by the gas sensor 7 is controlled by the second analog-to-digital conversion module through AT89S51 to obtain a digital voltage signal, and the digital voltage signal is displayed through the display screen. The carbon monoxide concentration is displayed by the electronic display screen 6 controlled by the 51 single chip microcomputer, so that an operator can observe conveniently.

The system also comprises a wireless transmission module, wherein the wireless transmission module is used for transmitting the carbon monoxide concentration to the client side for real-time monitoring. Set up wireless transmission module for carbon monoxide data carry out real-time detection to carbon monoxide concentration under the inconvenient circumstances of carrying out limited transmission. The wireless transmission module comprises a microprocessor, a second terminal module and a first terminal module, the microprocessor is connected with the output end of the second analog-to-digital conversion module and used for controlling the second terminal module and the first terminal module, and the microprocessor is AT89C 52. The AT89C52 single-chip microcomputer is used as a controller, so that the power consumption is low, the function is strong, and the expandability is strong. As shown in fig. 3, the connection relationship of the AT89C52 and the PTR2000 is provided, and the rest of the pins can refer to the chip instruction manual. As shown in FIG. 4, the first termination module includes a first PTR2000, the TXD pin of the AT89C52 is connected to the DI pin of the PTR2000, and the RXD pin of the AT89C52 is connected to the DO pin of the PTR 2000. As shown in fig. 5, the second terminal module includes a second PTR2000, the serial input DI of the second PTR2000 is connected to pin T2IN of MAX2000, the serial output DO pin MAX2000 of the second PTR2000 is connected to pin T1IN, and the output port of MAX2000 is connected to the corresponding input port of the PC. Through the technical means, the PTR2000 is used for receiving and sending the wireless transmission module, so that the number of peripheral elements is small, the working frequency is stable, and the anti-interference capability is strong.

The support rod 2 is an electric push rod. Set up bracing piece 2 into electric putter for bracing piece 2 is collapsible, extension, and is convenient using the utility model discloses the instrument distance can carry out and detect through extending bracing piece 2 when not enough, also conveniently carries when the shrink bracing piece 2.

The utility model discloses an implement the principle, the user is through inciting somebody to action the utility model discloses arrange carbon monoxide concentration environment in, power module provides sufficient electric energy for gas sensor, and the cavity is reachd through the filter layer to the air, and the carbon monoxide gas contact in the air takes place chemical reaction to gas sensor 7, produces electric current, and the current value is linear relation with the concentration of carbon monoxide, and a branch road is linearly enlarged the electric current through amplifier circuit and voltage stabilizing module, and the electric current after enlargiing becomes digital signal drive alarm module through an analog-to-digital conversion module and reports to the police.

The current collected by the gas sensor is converted into a digital voltage signal through the second analog-to-digital conversion module through the other branch circuit, and the digital voltage signal is connected with the input end of the AT89S51 chip and the AT89S51 chip to control the electronic display screen to display the concentration of the carbon monoxide.

The output port of the second digital-to-analog conversion module is also connected with the input port of the AT89C52, and the AT89C52 controls the first PTR2000 and the second receiving and sending PTR2000 data by controlling the working state of the AT89C52 through programs. When receiving a transmitting command, the PTR2000 is arranged in a transmitting module, namely TEXD is arranged to be 1; upon receipt of the receive command, PTR2000 is placed in receive mode, i.e., TEXD is set to 0.

The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed in the above teachings or as known to the person skilled in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A device for online monitoring data of flue gas comprises a base (1) and a cavity (3) arranged on the base, and is characterized in that a gas sensor (7), an amplifying circuit, a voltage stabilizing module, a first analog-to-digital conversion module and a power module are arranged in the cavity (3), the power module is electrically connected with the gas sensor (7), the output end of the gas sensor (7) is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage stabilizing module;

2. The device for online monitoring data of flue gas according to claim 1, wherein a drying layer (5) matched with the threaded cover (4) is further arranged between the threaded cover (4) and the gas sensor (7), a drying agent is filled in the drying layer (5), and a plurality of through holes are formed in the upper surface and the lower surface of the drying layer (5).

3. The device for online monitoring of flue gas data according to claim 1, wherein a first capacitor is arranged between the homodromous input end and the output end of the first operational amplifier, and a second capacitor is arranged between the non-homophase input end and the output end of the second operational amplifier.

4. The device for online monitoring of flue gas data according to claim 3, wherein an electronic display screen (6) is arranged on the surface of the cavity (3), a second analog-to-digital conversion module is further arranged in the cavity (3), and the voltage signal collected by the gas sensor (7) is controlled by the second analog-to-digital conversion module through AT89S51 to obtain a digital voltage signal, which is then displayed by the electronic display screen (6).

5. The device for the online monitoring data of the flue gas as recited in claim 4, further comprising a wireless transmission module, wherein the wireless transmission module is used for transmitting the carbon monoxide concentration to the client for real-time monitoring.

6. The device for on-line monitoring data of flue gas of claim 5, wherein the wireless transmission module comprises a microprocessor, a second terminal module and a first terminal module, the microprocessor is connected with the output end of the second analog-to-digital conversion module and is used for controlling the second terminal module and the first terminal module, and the microprocessor is AT89C 52.

7. The device for on-line monitoring data of flue gas as claimed in claim 6, wherein the first terminal module comprises a first PTR2000, and the output end of the AT89C52 is connected with the input end of the first PTR 2000; the second terminal module comprises a second PTR2000, and serial input DI and output DO pins of the second PTR2000 are connected with a serial port of the PC through MAX 2000.

8. The device for on-line monitoring data of flue gas as recited in claim 7, wherein said cavity (3) and base (1) are connected by a support rod (2), said support rod (2) is an electric push rod.