CN109613187B - Gas monitoring device - Google Patents
Gas monitoring device Download PDFInfo
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- CN109613187B CN109613187B CN201910133884.0A CN201910133884A CN109613187B CN 109613187 B CN109613187 B CN 109613187B CN 201910133884 A CN201910133884 A CN 201910133884A CN 109613187 B CN109613187 B CN 109613187B
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 44
- 238000005070 sampling Methods 0.000 claims abstract description 173
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims description 28
- 238000009530 blood pressure measurement Methods 0.000 claims description 18
- 238000009529 body temperature measurement Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 13
- 238000004140 cleaning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
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- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a gas monitoring device, comprising: the device comprises a high-pressure air flow sampling tube, a low-pressure air flow sampling tube, a differential pressure sensor, a high-pressure end zero-clearing electromagnetic valve, a low-pressure end zero-clearing electromagnetic valve and a controller; the high-pressure end zero clearing electromagnetic valve comprises a first channel and a second channel; the low-pressure end zero clearing electromagnetic valve comprises a third channel and a fourth channel; the controller controls the high-pressure end zero clearing electromagnetic valve to be switched to the first channel so that high-pressure air flow of the high-pressure air flow sampling tube is transmitted to the differential pressure sensor through the first channel; controlling the low-pressure end zero clearing electromagnetic valve to switch to a third channel so that low-pressure air flow of the low-pressure air flow sampling tube passes through the third channel to the differential pressure sensor; and controlling the high-voltage end zero clearing electromagnetic valve to be switched to the second channel, and controlling the low-voltage end zero clearing electromagnetic valve to be switched to the fourth channel so as to zero the differential pressure sensor. The invention provides a gas monitoring device, which aims to solve the problem of low testing precision of a gas detection device.
Description
Technical Field
The invention relates to the technical field of environmental protection monitoring, in particular to a gas monitoring device.
Background
With the improvement of the scientific technical level and the living standard of people, the environment pollution with different degrees is realized in the global scope, and the continuous monitoring of the concentration and the total emission of volatile organic compounds, gaseous pollutants and gaseous particulate matters is extremely important.
In the prior art, a gas monitoring device is arranged in a VOCS (volatile organic compound concentration and total emission continuous monitoring system) or a CEMS (gaseous pollutant and particulate matter concentration and total emission continuous monitoring system) for acquiring specific data of temperature, differential pressure and pressure of gas, thereby acquiring gas emission concentration and monitoring the gas emission concentration.
However, in the process of measuring the pressure difference by the gas monitoring device in the current industry, the pressure difference sensor is easy to drift due to environmental factors, the test precision is lower, meanwhile, the zero clearing and calibrating functions of the sensor are not available, and the increasingly accurate environment-friendly monitoring requirement is difficult to meet.
Disclosure of Invention
The embodiment of the invention provides a gas monitoring device, which aims to solve the problem of low testing precision of the gas monitoring device.
The embodiment of the invention provides a gas monitoring device, which comprises:
the device comprises a high-pressure air flow sampling tube, a low-pressure air flow sampling tube, a differential pressure sensor, a high-pressure end zero-clearing electromagnetic valve, a low-pressure end zero-clearing electromagnetic valve and a controller;
the first end of the high-pressure end zero clearing electromagnetic valve is communicated with the outlet end of the high-pressure air flow sampling tube, the second end of the high-pressure end zero clearing electromagnetic valve is communicated with the high-pressure end of the differential pressure sensor, and the third end of the high-pressure end zero clearing electromagnetic valve is communicated with the sixth end of the low-pressure end zero clearing electromagnetic valve; a first channel is formed between the first end and the second end of the high-voltage end zero clearing electromagnetic valve, and a second channel is formed between the second end and the third end of the high-voltage end zero clearing electromagnetic valve;
The fourth end of the low-pressure end zero clearing electromagnetic valve is communicated with the outlet end of the low-pressure air flow sampling tube, and the fifth end of the low-pressure end zero clearing electromagnetic valve is communicated with the low-pressure end of the differential pressure sensor; a third channel is formed between the fourth end and the fifth end of the low-pressure end zero clearing electromagnetic valve, and a fourth channel is formed between the fifth end and the sixth end;
the high-pressure end of the differential pressure sensor is communicated with the sixth end of the low-pressure end zero-clearing electromagnetic valve through the second channel, and the low-pressure end of the differential pressure sensor is communicated with the third end of the high-pressure end zero-clearing electromagnetic valve through the fourth channel of the low-pressure end zero-clearing electromagnetic valve;
the controller is respectively and electrically connected with the high-voltage end zero clearing electromagnetic valve and the low-voltage end zero clearing electromagnetic valve,
the controller is used for: controlling the high-pressure end zero clearing electromagnetic valve to be switched to a first channel so that high-pressure air flow collected by the high-pressure air flow sampling tube is conveyed to the high-pressure end of the differential pressure sensor through the first channel; controlling the low-pressure end zero clearing electromagnetic valve to switch to a third channel so that low-pressure air flow collected by the low-pressure air flow sampling tube passes through the third channel to the low-pressure end of the differential pressure sensor; and controlling the high-voltage end zero clearing electromagnetic valve to be switched to a second channel, and controlling the low-voltage end zero clearing electromagnetic valve to be switched to a fourth channel so as to zero the differential pressure sensor.
Optionally, the gas monitoring device further comprises: back blowing the air inlet pipe; the back-blowing air inlet pipe is respectively communicated with the outlet end of the high-pressure air flow sampling pipe and the outlet end of the low-pressure air flow sampling pipe and is used for conveying back-blowing air to the high-pressure air flow sampling pipe and the low-pressure air flow sampling pipe.
Optionally, the gas monitoring device further comprises: a high-pressure end blowback electromagnetic valve and a low-pressure end blowback electromagnetic valve; the seventh end of the high-pressure end back-blowing electromagnetic valve is communicated with the outlet end of the high-pressure air flow sampling pipe, the eighth end of the high-pressure end back-blowing electromagnetic valve is communicated with the first end of the high-pressure end zero clearing electromagnetic valve, and the ninth end of the high-pressure end back-blowing electromagnetic valve is communicated with the back-blowing air inlet pipe; a fifth channel is formed between the seventh end and the eighth end of the high-pressure end back-blowing electromagnetic valve, and a sixth channel is formed between the seventh end and the ninth end; the controller is electrically connected with the high-pressure end blowback electromagnetic valve and is used for controlling the high-pressure end blowback electromagnetic valve to be switched to a fifth channel, so that the high-pressure air flow sampling tube is communicated with the first end of the high-pressure end zero clearing electromagnetic valve through the fifth channel; the controller is also used for controlling the high-pressure end blowback electromagnetic valve to be switched to a sixth channel, so that the blowback air inlet pipe is communicated with the outlet end of the high-pressure air flow sampling pipe through the sixth channel; the tenth end of the low-pressure end back-blowing electromagnetic valve is communicated with the outlet end of the low-pressure air flow sampling pipe, the tenth end of the low-pressure end back-blowing electromagnetic valve is communicated with the fourth end of the low-pressure end zero clearing electromagnetic valve, and the twelfth end of the low-pressure end back-blowing electromagnetic valve is communicated with the back-blowing air inlet pipe; a seventh channel is formed between the tenth end and the eleventh end of the high-pressure end back-blowing electromagnetic valve, and an eighth channel is formed between the tenth end and the twelfth end; the controller is electrically connected with the low-pressure end blowback electromagnetic valve and is used for controlling the low-pressure end blowback electromagnetic valve to be switched to a seventh channel so that the low-pressure air flow sampling tube is communicated with a fourth end of the low-pressure end zero clearing electromagnetic valve through the seventh channel; the controller is also used for controlling the low-pressure end blowback electromagnetic valve to be switched to an eighth channel, so that the blowback air inlet pipe is communicated with the outlet end of the low-pressure air flow sampling pipe through the eighth channel of the low-pressure end blowback electromagnetic valve.
Optionally, the controller includes: the device comprises a detection device, a control chip and a trigger device; the detection device is electrically connected with the control chip and is used for sending a blowback trigger signal to the control chip when the high-voltage end blowback electromagnetic valve is switched to a sixth channel and the low-voltage end blowback electromagnetic valve is switched to an eighth channel; the control chip is electrically connected with the trigger device, and is used for generating a zero clearing trigger signal according to the blowback trigger signal and sending the zero clearing trigger signal to the trigger device; the trigger device is used for controlling the high-voltage end zero clearing electromagnetic valve to switch to the second channel according to the zero clearing trigger signal, controlling the low-voltage end zero clearing electromagnetic valve to switch to the fourth channel and controlling the differential pressure sensor to perform zero clearing operation.
Optionally, the detection device includes: the device comprises a rectifying circuit, a first filter capacitor and a bidirectional voltage stabilizing tube; the control chip is also used for outputting an alternating current signal through an alternating current signal output end when the high-voltage end back-flushing electromagnetic valve is switched to a sixth channel and the low-voltage end back-flushing electromagnetic valve is switched to an eighth channel; the input end of the rectifying circuit is electrically connected with the alternating current signal output end of the control chip and is used for rectifying the alternating current signal to form a direct current signal; the high-level output end of the rectifying circuit is electrically connected with the first connecting end of the first filter capacitor, and the low-level output end of the rectifying circuit is electrically connected with the second connecting end of the first filter capacitor and the ground end respectively; the bidirectional voltage stabilizing tube is connected with the first filter capacitor in parallel; the high-level output end of the rectifying circuit is electrically connected with the first input end of the control chip and is used for outputting the direct-current signal to the control chip.
Optionally, the triggering device includes: the switching device comprises a current limiting resistor, a switching tube, a first diode, a first relay, a second diode and a second relay; the first output end of the control chip is electrically connected with the control end of the switching tube through the current limiting resistor; the first connecting end of the switching tube is electrically connected with the anode of the first diode, and the second connecting end of the switching tube is electrically connected with the ground end; the cathode of the first diode is electrically connected with the first level output end; the first input end of the first relay is electrically connected with the first level output end, the second input end of the first relay is electrically connected with the positive electrode of the first diode, the first output end of the first relay is electrically connected with the high-voltage end zero clearing electromagnetic valve and used for controlling the high-voltage end zero clearing electromagnetic valve to be switched to a second channel, the second output end of the first relay is electrically connected with the low-voltage end zero clearing electromagnetic valve and used for controlling the low-voltage end zero clearing electromagnetic valve to be switched to a fourth channel, and the third output end of the first relay is respectively electrically connected with the negative electrode of the second diode and the first input end of the second relay; the second input end of the second relay is electrically connected with the anode of the second diode and the ground end respectively, and the first output end of the second relay is electrically connected with the differential pressure sensor and used for controlling the differential pressure sensor to execute zero clearing operation.
Optionally, the gas monitoring device further comprises: a temperature measurement sampling tube, a temperature sensor, a pressure measurement sampling tube and a pressure sensor; the temperature sensor is arranged at the inlet end of the temperature measurement sampling tube and is used for measuring the temperature of the air flow collected by the temperature measurement sampling tube; the pressure sensor is arranged at the outlet end of the pressure measurement sampling tube and is used for measuring the pressure of the air flow collected by the pressure measurement sampling tube.
Optionally, the gas monitoring device further comprises: sampling a pitot tube; the sampling pitot tube is used for coating the high-pressure air flow sampling tube, the low-pressure air flow sampling tube, the temperature measurement sampling tube and the pressure measurement sampling tube.
Optionally, the gas monitoring device further comprises: a movable mounting flange; the movable mounting flange is arranged at the periphery of the sampling pitot tube; the movable mounting flange is position-adjustable along the extension direction of the sampling pitot tube.
Optionally, the gas monitoring device further comprises: installing a box body; the installation box body is communicated with one end of the sampling pitot tube, which is close to the outlet end of the high-pressure air flow sampling tube; the differential pressure sensor, the high-pressure end zero-clearing electromagnetic valve, the low-pressure end zero-clearing electromagnetic valve and the pressure sensor are all arranged in the installation box body.
Optionally, the differential pressure sensor is a monocrystalline silicon differential pressure sensor or a capacitive differential pressure sensor.
In the invention, the high-pressure end zero clearing electromagnetic valve is connected with the high-pressure end of the high-pressure air flow sampling pipe and the high-pressure end of the differential pressure sensor through the first channel, so that the high-pressure air flow collected by the high-pressure air flow sampling pipe is conveyed to the high-pressure end of the differential pressure sensor through the first channel, the low-pressure end zero clearing electromagnetic valve is connected with the low-pressure end of the low-pressure air flow sampling pipe and the low-pressure end of the differential pressure sensor through the third channel, the low-pressure air flow collected by the low-pressure air flow sampling pipe is conveyed to the low-pressure end of the differential pressure sensor through the third channel, the differential pressure sensor can detect the differential pressure of the high-pressure air flow and the low-pressure air flow, the high-pressure end zero clearing electromagnetic valve is connected with the high-pressure end of the differential pressure sensor through the second channel and the fourth channel of the low-pressure end zero clearing electromagnetic valve, and the fourth channel of the low-pressure end zero clearing electromagnetic valve is connected with the second channel and the low-pressure end of the differential pressure sensor, so that the low-pressure end of the differential pressure sensor and the high-pressure end of the differential pressure sensor can be communicated through the second channel and the third channel, and the differential pressure sensor can be operated in a zero-pressure free environment, and the differential pressure sensor can have high-pressure sensor testing precision.
Drawings
FIG. 1 is a schematic diagram of a gas monitoring apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gas monitoring system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another gas monitoring apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another gas monitoring apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a controller according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another controller according to an embodiment of the present invention;
FIG. 7 is a front view of a gas monitoring apparatus according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of a sampling portion of a gas monitoring apparatus according to an embodiment of the present invention;
FIG. 9 is another schematic cross-sectional view of a sampling portion of a gas monitoring apparatus according to an embodiment of the present invention;
FIG. 10 is a side view of a gas monitoring apparatus according to an embodiment of the present invention;
fig. 11 is a schematic structural view of a pallet installation module according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
An embodiment of the present invention provides a gas monitoring device, referring to fig. 1, fig. 1 is a schematic structural diagram of a gas monitoring device provided by the embodiment of the present invention, where the gas monitoring device includes: the high-pressure air flow sampling tube 11, the low-pressure air flow sampling tube 12, the differential pressure sensor 13, the high-pressure end zero-clearing electromagnetic valve 14, the low-pressure end zero-clearing electromagnetic valve 15 and the controller 16;
the first end a of the high-pressure end zero clearing electromagnetic valve 14 is communicated with the outlet end of the high-pressure air flow sampling tube 11, the second end b is communicated with the high-pressure end of the differential pressure sensor 13, and the third end c is communicated with the sixth end f of the low-pressure end zero clearing electromagnetic valve 15; a first channel is formed between a first end a and a second end b of the high-pressure end zero clearing electromagnetic valve 14, and a second channel is formed between the second end b and a third end c;
the fourth end d of the low-pressure end zero clearing electromagnetic valve 15 is communicated with the outlet end of the low-pressure air flow sampling tube 12, and the fifth end e is communicated with the low-pressure end of the differential pressure sensor 13; a third channel is formed between a fourth end d and a fifth end e of the low-pressure end zero clearing electromagnetic valve 15, and a fourth channel is formed between the fifth end e and a sixth end f;
the high-pressure end of the differential pressure sensor 13 is communicated with the sixth end f of the low-pressure end zero-clearing electromagnetic valve 15 through a second channel, and the low-pressure end is communicated with the third end c of the high-pressure end zero-clearing electromagnetic valve 14 through a fourth channel of the low-pressure end zero-clearing electromagnetic valve 15;
The controller 16 is electrically connected with the high-pressure end zero solenoid valve 14 and the low-pressure end zero solenoid valve 15 respectively,
the controller 16 is configured to: the high-pressure end zero clearing electromagnetic valve 14 is controlled to be switched to a first channel, so that high-pressure air flow collected by the high-pressure air flow sampling tube 11 is conveyed to the high-pressure end of the differential pressure sensor 13 through the first channel; the low-pressure end zero clearing electromagnetic valve 15 is controlled to be switched to a third channel, so that low-pressure air flow collected by the low-pressure air flow sampling tube 12 passes through the third channel to the low-pressure end of the differential pressure sensor 13; the high-pressure side clear solenoid valve 14 is controlled to switch to the second channel, and the low-pressure side clear solenoid valve 15 is controlled to switch to the fourth channel, so that the differential pressure sensor 13 is cleared.
Referring to fig. 2, fig. 2 is a schematic diagram of gas monitoring provided in an embodiment of the present invention, when a gas monitoring device measures a differential pressure value of a monitored gas, the gas monitoring device generally stretches into a gas pipeline of the gas to be detected through a high-pressure gas flow sampling pipe 11 and a low-pressure gas flow sampling pipe 12, and measures the differential pressure value of the gas obtained in the gas pipeline 2, so that a user obtains an emission concentration and a total emission amount of the gas emitted in the gas pipeline 2 according to the differential pressure value. The flow direction of the gas in the gas pipeline 2 is shown by arrows in fig. 2, the inlet ends of the high-pressure gas flow sampling pipe 11 and the low-pressure gas flow sampling pipe 12 are slightly bent, the inlet end of the high-pressure gas flow sampling pipe 11 is bent towards the flow direction of the gas flow, so that the high-pressure gas flow is obtained, and the inlet end of the low-pressure gas flow sampling pipe 12 is bent away from the flow direction of the gas flow, so that the low-pressure gas flow is obtained.
With continued reference to fig. 1, the high pressure air flow sampling tube 11 is communicated with the high pressure end of the differential pressure sensor 13 through the high pressure end clearing solenoid valve 14 for delivering high pressure air flow to the differential pressure sensor 13, and the low pressure air flow sampling tube 12 is communicated with the low pressure end of the differential pressure sensor 13 through the low pressure end clearing solenoid valve 15 for delivering low pressure air flow to the differential pressure sensor 13, so that the differential pressure sensor 13 obtains the differential pressure value of the monitored air according to the high pressure air flow and the low pressure air flow.
The high-end clear solenoid valve 14 includes three terminals: the first end a, the second end b and the third end c form a first channel between the first end a and the second end b, and a second channel between the second end b and the third end c. The first end a is communicated with the outlet end of the high-pressure air flow sampling tube 11, and the second end b is communicated with the high-pressure end of the differential pressure sensor 13, so that the high-pressure air flow collected by the high-pressure air flow sampling tube 11 is conveyed to the high-pressure end of the differential pressure sensor 13 through the first channel.
Similarly, the low-end clear solenoid valve 15 includes three terminals: a third channel is formed between the fourth end d, the fifth end e and the sixth end f, and a fourth channel is formed between the fifth end e and the sixth end f. The fourth end d is communicated with the outlet end of the low-pressure air flow sampling tube 12, and the fifth end e is communicated with the low-pressure end of the differential pressure sensor 13, so that the low-pressure air flow collected by the low-pressure air flow sampling tube 12 is conveyed to the low-pressure end of the differential pressure sensor 13 through a third channel.
The third end c of the high-pressure end zero clearing electromagnetic valve 14 is communicated with the sixth end f of the low-pressure end zero clearing electromagnetic valve 15, namely, the high-pressure end of the differential pressure sensor 13 is communicated with the sixth end f of the low-pressure end zero clearing electromagnetic valve 15 through a second channel, and the low-pressure end is communicated with the third end c of the high-pressure end zero clearing electromagnetic valve 14 through a fourth channel of the low-pressure end zero clearing electromagnetic valve 15. The controller 16 is electrically connected to the high-voltage end zero solenoid valve 14 and the low-voltage end zero solenoid valve 15, respectively, and is used for controlling the high-voltage end zero solenoid valve 14 to switch between the first channel and the second channel, and controlling the low-voltage end zero solenoid valve 15 to switch between the third channel and the fourth channel. When the controller 16 controls the high-voltage end zero clearing electromagnetic valve 14 to switch to the second channel and controls the low-voltage end zero clearing electromagnetic valve 15 to switch to the fourth channel, the high-voltage end and the low-voltage end of the differential pressure sensor 13 are communicated, so that the differential pressure sensor 13 is cleared under the condition of no differential pressure, the accuracy of clearing is ensured, and the measurement precision of the differential pressure sensor 13 is improved.
Alternatively, the differential pressure sensor 13 is a monocrystalline silicon differential pressure sensor or a capacitive differential pressure sensor. Preferably, the differential pressure sensor 13 is a high overload differential pressure sensor to effectively prevent damage to the differential pressure sensor caused by overload.
In this embodiment, the high-pressure end zero clearing solenoid valve is connected to the high-pressure end of the high-pressure air flow sampling tube and the high-pressure end of the differential pressure sensor through the first channel, so that the high-pressure air flow collected by the high-pressure air flow sampling tube is conveyed to the high-pressure end of the differential pressure sensor through the first channel, the low-pressure end zero clearing solenoid valve is connected to the low-pressure end of the low-pressure air flow sampling tube and the low-pressure end of the differential pressure sensor through the third channel, so that the low-pressure air flow collected by the low-pressure air flow sampling tube is conveyed to the low-pressure end of the differential pressure sensor through the third channel, the differential pressure sensor can detect the differential pressure of the high-pressure air flow and the low-pressure air flow, and the high-pressure end zero clearing solenoid valve is connected to the high-pressure end of the differential pressure sensor through the second channel and the fourth channel of the low-pressure end zero clearing solenoid valve, and the fourth channel of the low-pressure end zero clearing solenoid valve is connected to the second channel and the low-pressure end of the differential pressure sensor, so that the low-pressure end of the differential pressure sensor and the high-pressure end of the differential pressure sensor can be communicated through the second channel and the third channel, and the differential pressure sensor can operate in a zero clearing environment without differential pressure, so that the differential pressure sensor can have high test precision.
Optionally, referring to fig. 3, fig. 3 is a schematic structural diagram of another gas monitoring apparatus according to an embodiment of the present invention, where the gas monitoring apparatus further includes: a blowback intake pipe 17; the blowback intake pipe 17 is respectively communicated with the outlet end of the high-pressure air flow sampling pipe 11 and the outlet end of the low-pressure air flow sampling pipe 12, and is used for conveying blowback gas to the high-pressure air flow sampling pipe 11 and the low-pressure air flow sampling pipe 12.
For the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12, the gas collected by each of the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12 flows from the inlet end to the outlet end, and the gas collected by each of the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12 contains a lot of industrially processed particle impurities, so that the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12 are easy to be blocked, a blowback air inlet pipe 17 can be arranged, the blowback gas is input from the inlet end of the blowback air inlet pipe 17 and is output from the outlet end of the blowback air inlet pipe 17 to the outlet ends of the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12, so that the blowback gas is conveyed from the outlet end of the high-pressure air flow sampling tube 11 to the inlet end and the outlet end of the low-pressure air flow sampling tube 12, and residual impurities in the high-pressure air flow sampling tube 11 and the low-pressure air flow sampling tube 12 are prevented from generating dirt.
Optionally, referring to fig. 4, fig. 4 is a schematic structural diagram of another gas monitoring apparatus according to an embodiment of the present invention, where the gas monitoring apparatus further includes: a high-pressure side blowback solenoid valve 18 and a low-pressure side blowback solenoid valve 19; a seventh end g of the high-pressure end back-flushing electromagnetic valve 18 is communicated with the outlet end of the high-pressure air flow sampling tube 11, an eighth end h is communicated with a first end a of the high-pressure end zero clearing electromagnetic valve 14, and a ninth end i is communicated with the back-flushing air inlet tube 17; a fifth channel is formed between a seventh end g and an eighth end h of the high-pressure end back-blowing electromagnetic valve 18, and a sixth channel is formed between the seventh end g and a ninth end i; the controller 16 is electrically connected with the high-pressure end blowback electromagnetic valve 18, and is used for controlling the high-pressure end blowback electromagnetic valve 18 to switch to a fifth channel, so that the high-pressure air flow sampling tube 11 is communicated with the first end a of the high-pressure end zero clearing electromagnetic valve 14 through the fifth channel; the controller 16 is further configured to control the high-pressure end blowback electromagnetic valve 18 to switch to a sixth channel, so that the blowback air inlet pipe 17 is communicated with the outlet end of the high-pressure airflow sampling pipe 11 through the sixth channel; the tenth end j of the low-pressure end back-flushing electromagnetic valve 19 is communicated with the outlet end of the low-pressure air flow sampling tube 12, the eleventh end k is communicated with the fourth end d of the low-pressure end zero-clearing electromagnetic valve 15, and the twelfth end m is communicated with the back-flushing air inlet tube 17; a seventh passage is formed between a tenth end j and an eleventh end k of the high-pressure end blowback electromagnetic valve 18, and an eighth passage is formed between the tenth end j and a twelfth end m; the controller 16 is electrically connected with the low-pressure end blowback electromagnetic valve 19, and is used for controlling the low-pressure end blowback electromagnetic valve 19 to switch to a seventh channel so that the low-pressure air flow sampling tube 12 is communicated with a fourth end d of the low-pressure end zero clearing electromagnetic valve 15 through the seventh channel; the controller 16 is further configured to control the low-pressure-end blowback electromagnetic valve 19 to switch to the eighth channel, so that the blowback air intake pipe 17 communicates with the outlet end of the low-pressure airflow sampling pipe 12 through the eighth channel of the low-pressure-end blowback electromagnetic valve 19.
The high-pressure end blowback solenoid valve 18 and the low-pressure end blowback solenoid valve 19 are the same as the high-pressure end zero clearing solenoid valve 14, and each of the high-pressure end blowback solenoid valve and the low-pressure end blowback solenoid valve comprises three terminals and two channels. Specifically, the high-pressure side blowback solenoid valve 18 includes: a fifth channel is formed between the seventh end g, the eighth end h and the ninth end i, and a sixth channel is formed between the seventh end g and the ninth end i; the low-pressure side blowback solenoid valve 19 includes: a tenth end j, a tenth end k and a twelfth end m, a seventh channel is formed between the tenth end j and the eleventh end k, and an eighth channel is formed between the tenth end j and the twelfth end m.
As shown in fig. 4, in this embodiment, the high-pressure end zero clearing solenoid valve 14, the low-pressure end zero clearing solenoid valve 15, the high-pressure end blowback solenoid valve 18 and the low-pressure end blowback solenoid valve 19 may be simultaneously provided, so that the gas detection device may have the functions of cleaning the back-blowing of the sampling tube and clearing the differential pressure sensor. Under the control of the controller 16, when the high-pressure end blowback electromagnetic valve 18 is switched to the fifth channel, the low-pressure end blowback electromagnetic valve 19 is switched to the seventh channel, the high-pressure end clear electromagnetic valve 14 is switched to the first channel, the low-pressure end clear electromagnetic valve 15 is switched to the third channel, the low-pressure air flow collected by the low-pressure air flow sampling tube 12 can be transmitted to the low-pressure end of the differential pressure sensor 13, and the high-pressure air flow collected by the high-pressure air flow sampling tube 11 can be transmitted to the high-pressure end of the differential pressure sensor 13, so that the differential pressure sensor 13 can measure the differential pressure value; when the high-pressure side blowback electromagnetic valve 18 is switched to the sixth channel, the low-pressure side blowback electromagnetic valve 19 is switched to the eighth channel, the high-pressure side zero clearing electromagnetic valve 14 is switched to the second channel, the low-pressure side zero clearing electromagnetic valve 15 is switched to the fourth channel, the airflows collected by the low-pressure airflow sampling tube 12 and the high-pressure airflow sampling tube 11 cannot be conveyed to the differential pressure sensor 13, the blowback gas input by the blowback air inlet tube 17 cleans dirt in the high-pressure airflow sampling tube 11 through the sixth channel of the high-pressure side blowback electromagnetic valve 18, and cleans dirt in the low-pressure airflow sampling tube 11 through the eighth channel of the low-pressure side blowback electromagnetic valve 19, in addition, the high-pressure side zero clearing electromagnetic valve 14 is switched to the second channel, the low-pressure side zero clearing electromagnetic valve 15 is switched to the fourth channel, the low-pressure side and the high-pressure side of the differential pressure sensor 13 are conducted, and the differential pressure sensor 13 can perform zero clearing operation. Illustratively, the gas monitoring device may perform cleaning of the low-pressure gas flow sampling tube 12 and the high-pressure gas flow sampling tube 11 at intervals during the monitoring process, and perform a zero clearing operation on the differential pressure sensor 13.
Optionally, referring to fig. 5, fig. 5 is a schematic structural diagram of a controller according to an embodiment of the present invention, where the controller 16 includes: a detection device 161, a control chip 162, and a triggering device 163; the detection device 161 is electrically connected with the control chip 162, and is configured to send a blowback trigger signal to the control chip 162 when the high-voltage-side blowback electromagnetic valve 18 is switched to the sixth channel and the low-voltage-side blowback electromagnetic valve 19 is switched to the eighth channel; the control chip 162 is electrically connected with the trigger device 163, and is used for generating a zero clearing trigger signal according to the blowback trigger signal and sending the zero clearing trigger signal to the trigger device 163; the trigger device 163 is used for controlling the high-voltage end zero-clearing electromagnetic valve 14 to switch to the second channel according to the zero-clearing trigger signal, controlling the low-voltage end zero-clearing electromagnetic valve 15 to switch to the fourth channel, and controlling the differential pressure sensor 13 to perform zero-clearing operation.
The high-pressure end blowback solenoid valve 18 and the low-pressure end blowback solenoid valve 19 can be controlled by the control chip 162, and can also be controlled by other controllers of the gas monitoring device to switch channels so as to perform blowback cleaning of the low-pressure air flow sampling tube 12 and the high-pressure air flow sampling tube 11. The detection device 161 may be electrically connected to a control chip 162 or other controllers that control the high-pressure side blowback electromagnetic valve 18 and the low-pressure side blowback electromagnetic valve 19, and is configured to receive the detection signal when the control chip 162 or other controllers send a channel switching signal to control the high-pressure side blowback electromagnetic valve 18 and the low-pressure side blowback electromagnetic valve 19, generate a blowback trigger signal after the detection signal is received by the detection device 161 and transmit the blowback trigger signal to the control chip 162, the control chip 162 generates a zero clearing trigger signal according to the blowback trigger signal and sends the zero clearing trigger signal to the trigger device 163, the trigger device 163 controls the high-pressure side zero clearing electromagnetic valve 14 to switch to the second channel, controls the low-pressure side zero clearing electromagnetic valve 15 to switch to the fourth channel, so that both sides of the differential pressure sensor are turned on, and controls the differential pressure sensor 13 to perform a zero clearing operation.
Optionally, referring to fig. 6, fig. 6 is a schematic structural diagram of another controller according to an embodiment of the present invention, the detecting device 161 may include: the rectification circuit 164, the first filter capacitor C1 and the bidirectional voltage regulator TVS; the control chip 162 is further configured to output an ac signal through ac signal output terminals (N and L) when the high-pressure side blowback solenoid valve 18 is switched to the sixth channel and the low-pressure side blowback solenoid valve 19 is switched to the eighth channel; an input terminal of the rectifying circuit 164 is electrically connected to an ac signal output terminal of the controller 16, and is used for rectifying the ac signal to form a dc signal; the high level output terminal v0+ of the rectifying circuit 164 is electrically connected to the first connection terminal of the first filter capacitor C1, and the low level output terminal V0-of the rectifying circuit 164 is electrically connected to the second connection terminal of the first filter capacitor C1 and the ground terminal GND, respectively; the bidirectional voltage stabilizing tube TVS is connected with the first filter capacitor C1 in parallel; the high level output v0+ of the rectifying circuit 164 is electrically connected to the first input PC1 of the control chip 162, and is configured to output a dc signal to the control chip 162.
If the control chip 162 controls the switching of the channels of the high-pressure side blowback solenoid valve 18 and the low-pressure side blowback solenoid valve 19, the control chip 162 outputs an ac signal to the detection device 161 through the ac signal output terminals (N and L) when the control chip 162 switches the high-pressure side blowback solenoid valve 18 to the sixth channel and switches the low-pressure side blowback solenoid valve 19 to the eighth channel, and the rectification circuit 164 in the detection device 161 converts the ac signal into a dc signal and outputs the dc signal through the high-level output terminal v0+ and the low-level output terminal V0 of the rectification circuit 164.
A first filter capacitor C1 is further connected between the high level output end v0+ and the low level output end V0-of the rectifying circuit 164, and is configured to perform filtering processing on the dc signal, where the high level output end v0+ of the rectifying circuit 164 is connected to the first input end PC1 of the control chip 162 through the current limiting resistor R2, and the low level output end V0-of the rectifying circuit 164 is connected to the ground end GND through the current limiting resistor R2, so that the rectifying circuit 164 outputs the dc signal to the first input end PC1 of the control chip 162. The dc signal is a blowback trigger signal, and the control chip 162 may generate a clear trigger signal according to the blowback trigger signal, so that the control chip 162 controls the trigger device 163 according to the dc signal. In addition, a bidirectional voltage regulator TVS is further connected between the high-level output terminal v0+ and the low-level output terminal V0-of the rectifying circuit 164, and the bidirectional voltage regulator TVS can ensure the stability of the voltage difference between the high-level output terminal v0+ and the low-level output terminal V0-of the rectifying circuit 164, so as to prevent the voltage difference between the high-level output terminal v0+ and the low-level output terminal V0-from being too high, and has a certain protection effect on the control chip 162. Optionally, the detecting device 161 may further include a second filter capacitor C2, where the second filter capacitor C2 is connected in parallel with the first wave capacitor C1 to further filter, so as to ensure stability of the dc signal output to the control chip 162.
Optionally, with continued reference to fig. 6, the triggering device 163 may include: the switching device comprises a current limiting resistor R3, a switching tube M1, a first diode D1, a first relay KA1, a second diode D2 and a second relay KA2; the first output end PC2 of the control chip 162 is electrically connected with the control end of the switching tube M1 through a current limiting resistor R3; the first connecting end of the switching tube M1 is electrically connected with the anode of the first diode D1, and the second connecting end of the switching tube M1 is electrically connected with the ground end GND; the cathode of the first diode D1 is electrically connected with the first level output end V1; the first input end of the first relay KA1 is electrically connected with the first level output end V1, the second input end of the first relay KA1 is electrically connected with the positive electrode of the first diode D1, the first output end OUT1 of the first relay KA1 is electrically connected with the high-voltage end zero clearing electromagnetic valve 14 and used for controlling the high-voltage end zero clearing electromagnetic valve 14 to be switched to a second channel, the second output end OUT2 of the first relay KA1 is electrically connected with the low-voltage end zero clearing electromagnetic valve 15 and used for controlling the low-voltage end zero clearing electromagnetic valve 15 to be switched to a fourth channel, and the third output end OUT3 of the first relay KA1 is respectively electrically connected with the negative electrode of the second diode D2 and the first input end of the second relay KA2; the second input end of the second relay KA2 is electrically connected with the positive electrode of the second diode D2 and the ground end GND, respectively, and the first output end OUT4 of the second relay KA2 is electrically connected with the differential pressure sensor 13 for controlling the differential pressure sensor 13 to execute the zero clearing operation.
The control chip 162 generates a clear trigger signal according to the dc signal (blowback trigger signal) and sends the clear trigger signal to the trigger device 163, specifically, the control chip 162 outputs the clear trigger signal to the control end of the switching tube M1 through the first output end PC2, and as shown in fig. 6, the control chip 162 may be electrically connected to the control end of the switching tube M1 through the current limiting resistor R3. The first end of the switch tube M1 is electrically connected with the first relay KA1, and the second end of the switch tube M1 is electrically connected with the ground end GND and is used for controlling the first relay KA1 to work under the control of the zero clearing trigger signal. For example, if the switching tube M1 is turned on at a high level and turned off at a low level, the clear start signal is a high level signal, and when the control chip 162 outputs the high level signal to the control end of the switching tube M1, the switching tube M1 is turned on, the current output by the first level output end V1 flows to the first end of the switching tube M1 through the coil of the first relay KA1 and flows OUT from the second end of the switching tube M1, so that the first relay KA1 works, the first output end OUT1 of the first relay KA1 is electrically connected with the high voltage end clear solenoid valve 14, the second output end OUT2 of the first relay KA1 is electrically connected with the low voltage end clear solenoid valve 15 for controlling the switching of channels in the high voltage end clear solenoid valve 14 and the low voltage end clear solenoid valve 15, specifically, when the coil of the first relay KA1 flows current, the first relay KA1 controls the high-voltage side clear solenoid valve 14 to switch to the second channel, controls the low-voltage side clear solenoid valve 15 to switch to the fourth channel, and at this moment, referring to fig. 4, the control chip 162 has switched the high-voltage side blowback solenoid valve 18 to the sixth channel, switches the low-voltage side blowback solenoid valve 19 to the eighth channel, and controls the high-voltage side clear solenoid valve 14 to switch to the second channel, controls the low-voltage side clear solenoid valve 15 to switch to the fourth channel, and then the gas detection device may perform the blowback cleaning operation of the low-voltage gas flow sampling tube 12 and the high-voltage gas flow sampling tube 11 and the clearing operation of the differential pressure sensing at the same time.
When the high-pressure end zero clearing electromagnetic valve 14 is switched to the second channel and the low-pressure end zero clearing electromagnetic valve 15 is switched to the fourth channel, two sides of the differential pressure sensor 13 are communicated, namely, the differential pressure of two sides of the differential pressure sensor 13 is zero, so that the zero clearing effect of the differential pressure sensor 13 is more accurate, and the problem of incomplete zero clearing caused by the differential pressure of two sides of the differential pressure sensor 13 is prevented. When the high-voltage end zero clearing electromagnetic valve 14 is switched to the second channel and the low-voltage end zero clearing electromagnetic valve 15 is switched to the fourth channel, namely when the differential pressure on both sides of the differential pressure sensor 13 is zero, the first relay KA1 outputs current to the coil of the second relay KA2 through the third output end OUT3, so that the second relay KA2 works. The differential pressure sensor 13 is controlled to perform a zero clearing operation by the second relay KA2, and specifically, the first output terminal OUT4 of the second relay KA2 is electrically connected to the differential pressure sensor 13 and is used for controlling the differential pressure sensor 13.
In addition, the first input end of the first relay KA1 is electrically connected with the negative electrode of the first diode D1, and the second input end of the first relay KA1 is electrically connected with the positive electrode of the first diode D1, so that the first diode D1 and the first relay KA1 can form a loop, and accordingly, current generated by the coil of the first relay KA1 is discharged and the switch tube M1 is protected at the moment when the first relay KA1 is suddenly turned off. Similarly, the first input end of the second relay KA2 is electrically connected with the negative electrode of the second diode D2, the second input end of the second relay KA2 is electrically connected with the positive electrode of the second diode D2, and then the second diode D2 and the second relay KA2 can form a loop, and current generated by the coil of the second relay KA2 is discharged at the moment when the second relay KA2 is suddenly turned off.
Optionally, the first relay KA1 and the second relay KA2 can have a time delay function, clear the differential pressure sensor 13 at regular time, and the problem that the differential pressure sensor 13 is affected by the environment to drift so as to cause inaccurate testing is reduced.
Fig. 7 is a front view of a gas monitoring device according to an embodiment of the present invention, where the gas monitoring device includes a sampling portion 4 and a detecting portion 3, the sampling portion 4 is used for being inserted into a gas pipe of a gas to be detected, the gas to be detected is monitored for flow, and the detecting portion 3 is provided with a detecting device such as a differential pressure sensor 13.
Fig. 8 is a schematic cross-sectional view of a sampling portion of a gas monitoring apparatus according to an embodiment of the present invention, and fig. 9 is another schematic cross-sectional view of a sampling portion of a gas monitoring apparatus according to an embodiment of the present invention, where the cross-sections of fig. 8 and 9 are perpendicular to each other, and optionally, referring to fig. 7 to 9, the gas monitoring apparatus may further include: a temperature measurement sampling tube 21, a temperature sensor 24, a pressure measurement sampling tube 22, and a pressure sensor 25; the temperature sensor 24 is arranged at the inlet end of the temperature measurement sampling tube 21 and is used for measuring the temperature of the air flow collected by the temperature measurement sampling tube 21; the pressure sensor 25 is disposed at the outlet end of the pressure measurement sampling tube 22, and is used for measuring the pressure of the air flow collected by the pressure measurement sampling tube.
In this embodiment, the sampling portion 4 of the gas monitoring device integrates the high-pressure gas flow sampling tube 11, the low-pressure gas flow sampling tube 12, the temperature measurement sampling tube 21 and the pressure measurement sampling tube 22, so that the differential pressure sensor can obtain the differential pressure of the gas flow according to the high-pressure gas flow and the low-pressure gas flow, the temperature sensor 24 measures the temperature of the gas flow according to the gas flow of the temperature measurement sampling tube 21, and the pressure sensor 25 is used for obtaining the pressure of the gas flow in the pressure measurement sampling tube 22, so that the gas monitoring device integrates the functions of differential pressure measurement, temperature measurement and pressure measurement. Meanwhile, the device is convenient to install and easy to debug and maintain.
Optionally, with continued reference to fig. 7 to 9, the gas monitoring apparatus may further include: sampling pitot tube 23; the sampling pitot tube 23 encloses the high pressure gas flow sampling tube 11, the low pressure gas flow sampling tube 12, the temperature measurement sampling tube 21, and the pressure measurement sampling tube 22. The sampling pitot tube 23 enables the high-pressure air flow sampling tube 11, the low-pressure air flow sampling tube 12, the temperature measurement sampling tube 21 and the pressure measurement sampling tube 22 to share an insertion pipeline, so that the operation of the gas monitoring device is facilitated, and the high-pressure air flow sampling tube 11, the low-pressure air flow sampling tube 12, the temperature measurement sampling tube 21 and the pressure measurement sampling tube 22 do not need to be inserted into the gas pipeline respectively for detection.
Optionally, with continued reference to fig. 7, the gas monitoring apparatus may further include: a removable mounting flange 26; the movable mounting flange 26 is arranged on the periphery of the sampling pitot tube 23; the movable mounting flange 26 is position adjustable in the extending direction along the sampling pitot tube 23. The movable mounting flange 26 can move along the sampling pitot tube 23, so that the position of the movable mounting flange 26 on the sampling pitot tube 23 can be conveniently adjusted according to the diameter of a gas pipeline, and the distance between the fixed mounting structure and one end of the sampling pitot tube 23, which is inserted into the gas pipeline, is fixed, so that the fixed mounting structure is only applicable to the gas pipeline with fixed diameter values, and in the embodiment, the movable mounting flange 26 is adopted by the gas monitoring device, so that the universality of the gas monitoring device is enhanced, and the application range of the gas monitoring device is enlarged.
Optionally, with continued reference to fig. 7, the gas monitoring apparatus may further include: mounting a box 27; the mounting box 27 is communicated with one end of the sampling pitot tube 23 close to the outlet end of the high-pressure air flow sampling tube 11; the differential pressure sensor 13, the high-pressure end zero clearing electromagnetic valve 14, the low-pressure end zero clearing electromagnetic valve 15 and the pressure sensor are all arranged in the installation box body.
Referring to fig. 10, fig. 10 is a side view of a gas monitoring device provided in an embodiment of the present invention, in which a detection portion 3 of the gas monitoring device includes a pallet mounting module 28, where the pallet mounting module 28 is provided with elements such as a differential pressure sensor, and specifically referring to fig. 11, fig. 11 is a schematic structural diagram of the pallet mounting module provided in the embodiment of the present invention, the pallet mounting module 28 is provided with a mounting plate 29, and the mounting plate 29 is provided with a differential pressure sensor 13, a controller 16, a high-pressure end zero-clearing solenoid valve 14, a low-pressure end zero-clearing solenoid valve 15, a high-pressure end blowback solenoid valve 18, and a low-pressure end blowback solenoid valve 19. The electromagnetic valves are communicated through the air channel 31, and in addition, the electromagnetic valves are communicated with the differential pressure sensor 13, and the sampling pipe is communicated with the electromagnetic valves through the air channel 31.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (11)
1. A gas monitoring device, comprising: the device comprises a high-pressure air flow sampling tube, a low-pressure air flow sampling tube, a differential pressure sensor, a high-pressure end zero-clearing electromagnetic valve, a low-pressure end zero-clearing electromagnetic valve and a controller;
the first end of the high-pressure end zero clearing electromagnetic valve is communicated with the outlet end of the high-pressure air flow sampling tube, the second end of the high-pressure end zero clearing electromagnetic valve is communicated with the high-pressure end of the differential pressure sensor, and the third end of the high-pressure end zero clearing electromagnetic valve is communicated with the sixth end of the low-pressure end zero clearing electromagnetic valve; a first channel is formed between the first end and the second end of the high-voltage end zero clearing electromagnetic valve, and a second channel is formed between the second end and the third end of the high-voltage end zero clearing electromagnetic valve;
The fourth end of the low-pressure end zero clearing electromagnetic valve is communicated with the outlet end of the low-pressure air flow sampling tube, and the fifth end of the low-pressure end zero clearing electromagnetic valve is communicated with the low-pressure end of the differential pressure sensor; a third channel is formed between the fourth end and the fifth end of the low-pressure end zero clearing electromagnetic valve, and a fourth channel is formed between the fifth end and the sixth end;
the high-pressure end of the differential pressure sensor is communicated with the sixth end of the low-pressure end zero-clearing electromagnetic valve through the second channel, and the low-pressure end of the differential pressure sensor is communicated with the third end of the high-pressure end zero-clearing electromagnetic valve through the fourth channel of the low-pressure end zero-clearing electromagnetic valve;
the controller is respectively and electrically connected with the high-voltage end zero clearing electromagnetic valve and the low-voltage end zero clearing electromagnetic valve,
the controller is used for: controlling the high-pressure end zero clearing electromagnetic valve to be switched to a first channel so that high-pressure air flow collected by the high-pressure air flow sampling tube is conveyed to the high-pressure end of the differential pressure sensor through the first channel; controlling the low-pressure end zero clearing electromagnetic valve to switch to a third channel so that low-pressure air flow collected by the low-pressure air flow sampling tube passes through the third channel to the low-pressure end of the differential pressure sensor; and controlling the high-voltage end zero clearing electromagnetic valve to be switched to a second channel, and controlling the low-voltage end zero clearing electromagnetic valve to be switched to a fourth channel so as to zero the differential pressure sensor.
2. The gas monitoring device of claim 1, further comprising: back blowing the air inlet pipe;
the back-blowing air inlet pipe is respectively communicated with the outlet end of the high-pressure air flow sampling pipe and the outlet end of the low-pressure air flow sampling pipe and is used for conveying back-blowing air to the high-pressure air flow sampling pipe and the low-pressure air flow sampling pipe.
3. The gas monitoring device of claim 2, further comprising: a high-pressure end blowback electromagnetic valve and a low-pressure end blowback electromagnetic valve;
the seventh end of the high-pressure end back-blowing electromagnetic valve is communicated with the outlet end of the high-pressure air flow sampling pipe, the eighth end of the high-pressure end back-blowing electromagnetic valve is communicated with the first end of the high-pressure end zero clearing electromagnetic valve, and the ninth end of the high-pressure end back-blowing electromagnetic valve is communicated with the back-blowing air inlet pipe; a fifth channel is formed between the seventh end and the eighth end of the high-pressure end back-blowing electromagnetic valve, and a sixth channel is formed between the seventh end and the ninth end;
the controller is electrically connected with the high-pressure end blowback electromagnetic valve and is used for controlling the high-pressure end blowback electromagnetic valve to be switched to a fifth channel, so that the high-pressure air flow sampling tube is communicated with the first end of the high-pressure end zero clearing electromagnetic valve through the fifth channel; the controller is also used for controlling the high-pressure end blowback electromagnetic valve to be switched to a sixth channel, so that the blowback air inlet pipe is communicated with the outlet end of the high-pressure air flow sampling pipe through the sixth channel;
The tenth end of the low-pressure end back-blowing electromagnetic valve is communicated with the outlet end of the low-pressure air flow sampling pipe, the tenth end of the low-pressure end back-blowing electromagnetic valve is communicated with the fourth end of the low-pressure end zero clearing electromagnetic valve, and the twelfth end of the low-pressure end back-blowing electromagnetic valve is communicated with the back-blowing air inlet pipe; a seventh channel is formed between the tenth end and the eleventh end of the high-pressure end back-blowing electromagnetic valve, and an eighth channel is formed between the tenth end and the twelfth end;
the controller is electrically connected with the low-pressure end blowback electromagnetic valve and is used for controlling the low-pressure end blowback electromagnetic valve to be switched to a seventh channel so that the low-pressure air flow sampling tube is communicated with a fourth end of the low-pressure end zero clearing electromagnetic valve through the seventh channel; the controller is also used for controlling the low-pressure end blowback electromagnetic valve to be switched to an eighth channel, so that the blowback air inlet pipe is communicated with the outlet end of the low-pressure air flow sampling pipe through the eighth channel of the low-pressure end blowback electromagnetic valve.
4. A gas monitoring device according to claim 3, wherein the controller comprises: the device comprises a detection device, a control chip and a trigger device;
the detection device is electrically connected with the control chip and is used for sending a blowback trigger signal to the control chip when the high-voltage end blowback electromagnetic valve is switched to a sixth channel and the low-voltage end blowback electromagnetic valve is switched to an eighth channel;
The control chip is electrically connected with the trigger device, and is used for generating a zero clearing trigger signal according to the blowback trigger signal and sending the zero clearing trigger signal to the trigger device; the trigger device is used for controlling the high-voltage end zero clearing electromagnetic valve to switch to the second channel according to the zero clearing trigger signal, controlling the low-voltage end zero clearing electromagnetic valve to switch to the fourth channel and controlling the differential pressure sensor to perform zero clearing operation.
5. The gas monitoring device of claim 4, wherein the detection device comprises: the device comprises a rectifying circuit, a first filter capacitor and a bidirectional voltage stabilizing tube;
the control chip is also used for outputting an alternating current signal through an alternating current signal output end when the high-voltage end back-flushing electromagnetic valve is switched to a sixth channel and the low-voltage end back-flushing electromagnetic valve is switched to an eighth channel;
the input end of the rectifying circuit is electrically connected with the alternating current signal output end of the control chip and is used for rectifying the alternating current signal to form a direct current signal;
the high-level output end of the rectifying circuit is electrically connected with the first connecting end of the first filter capacitor, and the low-level output end of the rectifying circuit is electrically connected with the second connecting end of the first filter capacitor and the ground end respectively; the bidirectional voltage stabilizing tube is connected with the first filter capacitor in parallel;
The high-level output end of the rectifying circuit is electrically connected with the first input end of the control chip and is used for outputting the direct-current signal to the control chip.
6. The gas monitoring device of claim 5, wherein the triggering device comprises: the switching device comprises a current limiting resistor, a switching tube, a first diode, a first relay, a second diode and a second relay;
the first output end of the control chip is electrically connected with the control end of the switching tube through the current limiting resistor; the first connecting end of the switching tube is electrically connected with the anode of the first diode, and the second connecting end of the switching tube is electrically connected with the ground end; the cathode of the first diode is electrically connected with the first level output end;
the first input end of the first relay is electrically connected with the first level output end, the second input end of the first relay is electrically connected with the positive electrode of the first diode, the first output end of the first relay is electrically connected with the high-voltage end zero clearing electromagnetic valve and used for controlling the high-voltage end zero clearing electromagnetic valve to be switched to a second channel, the second output end of the first relay is electrically connected with the low-voltage end zero clearing electromagnetic valve and used for controlling the low-voltage end zero clearing electromagnetic valve to be switched to a fourth channel, and the third output end of the first relay is respectively electrically connected with the negative electrode of the second diode and the first input end of the second relay;
The second input end of the second relay is electrically connected with the anode of the second diode and the ground end respectively, and the first output end of the second relay is electrically connected with the differential pressure sensor and used for controlling the differential pressure sensor to execute zero clearing operation.
7. The gas monitoring device of claim 1, further comprising: a temperature measurement sampling tube, a temperature sensor, a pressure measurement sampling tube and a pressure sensor;
the temperature sensor is arranged at the inlet end of the temperature measurement sampling tube and is used for measuring the temperature of the air flow collected by the temperature measurement sampling tube;
the pressure sensor is arranged at the outlet end of the pressure measurement sampling tube and is used for measuring the pressure of the air flow collected by the pressure measurement sampling tube.
8. The gas monitoring device of claim 7, further comprising: sampling a pitot tube;
the sampling pitot tube is used for coating the high-pressure air flow sampling tube, the low-pressure air flow sampling tube, the temperature measurement sampling tube and the pressure measurement sampling tube.
9. The gas monitoring device of claim 8, further comprising: a movable mounting flange;
the movable mounting flange is arranged at the periphery of the sampling pitot tube;
The movable mounting flange is position-adjustable along the extension direction of the sampling pitot tube.
10. The gas monitoring device of claim 8, further comprising: installing a box body;
the installation box body is communicated with one end of the sampling pitot tube, which is close to the outlet end of the high-pressure air flow sampling tube;
the differential pressure sensor, the high-pressure end zero-clearing electromagnetic valve, the low-pressure end zero-clearing electromagnetic valve and the pressure sensor are all arranged in the installation box body.
11. A gas monitoring device according to any one of claims 1 to 10, wherein,
the differential pressure sensor is a monocrystalline silicon differential pressure sensor or a capacitance differential pressure sensor.
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| CN109613187A (en) | 2019-04-12 |
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