CN109307612B - Device and method for preventing gas sampling passage from being blocked - Google Patents
Device and method for preventing gas sampling passage from being blocked Download PDFInfo
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- CN109307612B CN109307612B CN201811223554.2A CN201811223554A CN109307612B CN 109307612 B CN109307612 B CN 109307612B CN 201811223554 A CN201811223554 A CN 201811223554A CN 109307612 B CN109307612 B CN 109307612B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
The invention belongs to the field of gas component detection, and particularly relates to a device and a method for preventing a gas sampling passage from being blocked, wherein the device is of an integrated structure and comprises a first gas hose with one end serving as a first end part of the device, a second gas hose with one end serving as a second end part of the device, and a gas detection pipeline, wherein the other end of the first gas hose is communicated with the other end of the second gas hose through the gas detection pipeline; the middle parts of the first gas hose and the second gas hose are close to each other, and a gas sampling power mechanism is arranged at the close part; the first end portion and the second end portion are respectively provided with a first gas filter and a second gas filter. The invention has the advantages that: the fluency of the gas in the gas sampling passage can be improved, and the pollution or corrosion to other components such as an optical device of the detection device can be avoided.
Description
Technical Field
The invention relates to the field of gas component detection, in particular to a device and a method for preventing a gas sampling passage from being blocked.
Background
The detection of environmental gas components is commonly found in various places such as industrial production, social activities, even household life and the like, and is an important technical means for ensuring the environmental quality and protecting the personal safety. Due to the influence of suspended matters such as dust, particles or aerosol in the air, a gas sampling passage of a gas component detection device or equipment is often blocked, so that the efficiency of the detection device or equipment is reduced or even the detection device or equipment cannot be used. In addition, in conventional gas detection, the optical device is usually exposed to the gas to be measured, and is very susceptible to negative effects such as contamination, corrosion and the like, thereby further interfering with the measurement result. Therefore, according to the influence degree of suspended matters in the gas environment and the physicochemical properties of the gas to be detected, the conventional gas component detection device needs to be periodically operated and maintained, including dust removal and even part replacement of a gas sampling passage. Related operation and maintenance work often needs to disassemble devices or equipment, the requirement on professional technology is high, and the operation and maintenance cost is high due to the fact that the business volume is extremely large when the Internet of things detection system is distributed in a large scale.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a device and a method for preventing the blockage of a gas sampling passage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for preventing a gas sampling passage from being blocked is of an integrated structure and comprises a first gas hose, a second gas hose and a gas detection pipeline, wherein one end of the first gas hose is used as a first end part of the device, one end of the second gas hose is used as a second end part of the device, and the other end of the first gas hose is communicated with the other end of the second gas hose through the gas detection pipeline;
the middle parts of the first gas hose and the second gas hose are close to each other, and a gas sampling power mechanism is arranged at the close part;
the first end portion and the second end portion are respectively provided with a first gas filter and a second gas filter.
Preferably, a first air bag and a second air bag are respectively connected between the first air hose and the gas detection pipeline and between the second air hose and the gas detection pipeline.
Preferably, the first gas filter and the second gas filter are manufactured by superposing single-layer or multi-layer filter screens and/or filter membranes and/or filter paper.
Preferably, the gas detection pipeline is made of a high-transparency flexible material, and shows spectral characteristics under the irradiation of light.
Preferably, the first air bag and the second air bag are made of high-elasticity materials, and the gas containing volume per unit length is larger than that of the first gas hose and the second gas hose.
Preferably, flow meters for measuring the gas flow are arranged on the first gas hose and the second gas hose.
A method of using the above apparatus for preventing blockage of a gas sampling passage, comprising the steps of:
s1, setting working parameters of the gas sampling power mechanism, wherein the working parameters comprise a rotating speed and a forward and reverse rotation replacement frequency, and starting the gas sampling power mechanism;
and S2, purging and removing the deposits on the outer side walls of the first gas filter and the second gas filter by utilizing the positive and negative airflow provided by the gas sampling power mechanism, and performing spectrum detection on the gas at the gas detection pipeline.
Preferably, in step S2, the gas sampling power mechanism is accelerated and decelerated to replace the rotation direction when rotating in the forward direction and the reverse direction.
Preferably, step S2 further includes:
the gas flow is detected by using the flow meters on the first gas hose and the second gas hose, and when the gas flow is always smaller than a threshold value within a set time range, the working parameters of the gas sampling power mechanism are reset, so that the initial rotation speed and/or the maximum speed and/or the frequency of positive and negative rotation replacement are improved.
The invention has the advantages that:
(1) the device is a complete integrated gas sampling passage, so that the fluency of gas in the gas sampling passage can be improved, and water (or liquid drops) possibly contained in the gas to be detected is blocked outside the gas sampling passage, so as to avoid polluting or corroding other components of the optical device and the like of the detection device, and the device can be integrally replaced when necessary.
(2) The gas sampling power mechanism of the invention realizes that the gas flows with opposite directions are generated in the gas sampling passage, namely reciprocating gas flows with certain frequency are generated in the sampling passage by quickly switching the gas flow direction. And by varying the magnitude of the gas flow, the gas flow will generate an axial impact force on deposits outside the first gas filter and the second gas filter. According to the newton's second law of physics, the higher the frequency of the change of the direction of the airflow during the reciprocating motion of the airflow, i.e. the higher the acceleration, the higher the pressure of the airflow (in addition, the higher the initial velocity of the airflow, the higher the pressure of the airflow will be); the higher the efficiency of the outer side walls of the first and second gas filters driven by the pressure of the reciprocating gas flow. The air flow speed and the air flow reciprocating frequency are controlled by an air sampling power mechanism. Then, the particles (or deposits) originally deposited on the inner wall of the sampling channel will be loosened or fall off.
(3) In the rotating process of the gas sampling power mechanism, the gas flows near the first end and the second end both have pulsation characteristics, and the faster the rotating speed of the gas sampling power mechanism is, the higher the gas pulsation frequency is; the higher the frequency, the stronger the force between the gas flow and the solid particles and particles, and the more conducive to blowing out the solid and liquid particles adhered to the outer side walls of the first gas filter and the second gas filter pipeline. Under the condition that the direction of the airflow is changed continuously, solid and liquid particles are difficult to attach firmly, so that the cleanness and the smoothness of the gas sampling passage are kept.
(4) According to the rotating direction of the gas sampling power mechanism, the working process can be divided into a clockwise period and a counterclockwise period. The first process is in a clockwise cycle with the second end of the gas sampling path being the incoming gas flow and the first end being the outgoing gas flow. Particulate matter in the ambient air adheres to the second gas filter outer side wall along the gas flow. The second process is to change the rotation direction of the gas sampling power mechanism and enter a counterclockwise period, wherein in the counterclockwise period, the second end part in the gas sampling passage is an outgoing gas flow, and the first end part is an incoming gas flow. In the last cycle, particles adhering to the outer side wall of the second gas filter are blown away by the outgoing gas flow. Constantly change gas sampling power unit's rotation direction to repeat above-mentioned two processes, under the state that the air current direction constantly changes, solid, liquid granule are difficult to firmly attach to on first gas cleaner and the second gas cleaner lateral wall, and constantly are blown away to keep the cleanness and the unobstructed of gas sampling passageway.
(5) The first air bag and the second air bag can provide air buffering, and under the action of the air sampling power mechanism, the air flow in the air sampling passage has the characteristic of pulsation. The pulsation phenomenon can be reduced through the elastic action of the air bag, and the stability of the pipe wall in the gas detection pipeline is ensured. The stability can keep the stability of the spectrum detection value to a certain extent, and the detection accuracy is improved.
(6) In the device, gaseous sampling pipeline and gas detection pipe connection, outside gas detection device only need carry out spectral analysis to gas detection pipeline, and gaseous sampling and the mutual independent two parts of gas detection can not let gas lead to the fact the pollution to gas detection device like this, are favorable to low-cost industrialization, have also reduced fortune dimension cost simultaneously.
(7) According to the method, the arrangement of the flowmeter is adopted, and the working parameters of the gas sampling power mechanism are adjusted, so that the impact force of the reciprocating gas flow on the sediment is improved, and the high-viscosity sediment is prevented from being adhered to the first gas filter and the second gas filter.
Drawings
Fig. 1 is a schematic structural view of an apparatus for preventing clogging of a gas sampling passage.
Fig. 2 is a flow chart of a method of using the device for preventing clogging of a gas sampling passage.
The notations in the figures have the following meanings:
11-first gas hose 12-second gas hose 13-third gas hose
21-first bladder 22-second bladder
3-gas detection pipeline
41-first gas filter 42-second gas filter
5-gas sampling power mechanism
Detailed Description
Example 1
As shown in FIG. 1, the device for preventing the blockage of the gas sampling passage is of an integrated structure and comprises a first gas hose 11 with one end serving as a first end part of the device, a second gas hose 12 with one end serving as a second end part of the device and a gas detection pipeline 3, wherein the other end of the first gas hose 11 is communicated with the other end of the second gas hose 12 through the gas detection pipeline 3, and a first air bag 21 and a second air bag 22 are respectively connected between the first gas hose 11, the second gas hose 12 and the gas detection pipeline 3. The transition between the first balloon 21 and the gas detection line 3, and between the second balloon 22 and the gas detection line 3 may also be via a third gas hose 13.
The middle parts of the first gas hose 11 and the second gas hose 12 are close to each other and are provided with a gas sampling power mechanism 5, the gas sampling power mechanism 5 rotates forwards and backwards to extrude the first gas hose 11 and the second gas hose 12, and the first end part and the second end part of the device are alternately used as gas input ends.
The first and second end portions are provided with a first gas filter 41 and a second gas filter 42, respectively.
The first gas filter 41 and the second gas filter 42 are made by superposing single-layer or multi-layer filter screens and/or filter membranes and/or filter paper.
The gas detection pipeline 3 is made of high-transparency flexible materials, and the gas detection pipeline 3 shows spectral characteristics under the irradiation of light. The first air bag 21 and the second air bag 22 are made of high elastic materials, and the gas containing volume in unit length is larger than that of the first gas hose 11 and the second gas hose 12.
In addition, flow meters for measuring the flow rate of the gas may be provided in the first gas hose 11 and the second gas hose 12. The data obtained by the flowmeter are transmitted to a control system, and the control system controls and changes the working parameters of the gas sampling power mechanism 5.
Example 2
As shown in fig. 2, the method for using the device for preventing the blockage of the gas sampling passage comprises the following steps:
s1, setting working parameters of the gas sampling power mechanism 5, wherein the working parameters comprise a rotating speed and a forward and reverse rotation replacement frequency, and starting the gas sampling power mechanism 5;
s2, purging and removing the deposits on the outer side walls of the first gas filter 41 and the second gas filter 42 by utilizing the positive and negative airflow provided by the gas sampling power mechanism 5, and performing spectrum detection on the gas at the gas detection pipeline 3; in step S2, the rotational direction is changed by accelerating and decelerating the rotation of the gas sampling power mechanism 5 in both the normal rotation and the reverse rotation.
In addition, when the apparatus includes a flow meter, step S2 further includes the following: when the gas flow is always smaller than the threshold value within the set time range, the working parameters of the gas sampling power mechanism 5 are reset, and one or more values of the initial rotation speed, the highest speed and the positive and negative rotation replacement frequency are increased, so that the impact force of the reciprocating gas flow on the sediment is increased.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The device for preventing the blockage of the gas sampling passage is characterized by being of an integrated structure and comprising a first gas hose (11) with one end serving as a first end part of the device, a second gas hose (12) with one end serving as a second end part of the device and a gas detection pipeline (3), wherein the other end of the first gas hose (11) is communicated with the other end of the second gas hose (12) through the gas detection pipeline (3);
the middle parts of the first gas hose (11) and the second gas hose (12) are close to each other, a gas sampling power mechanism (5) is arranged at the close position, the gas sampling power mechanism (5) rotates forwards and backwards to extrude the first gas hose (11) and the second gas hose (12), and the first end part and the second end part of the device are alternately used as gas input ends;
the first end portion and the second end portion are respectively provided with a first gas filter (41) and a second gas filter (42).
2. A device for preventing blockage of a gas sampling passage according to claim 1, wherein a first air bag (21) and a second air bag (22) are connected between the first gas hose (11) and the second gas hose (12) and the gas detection line (3), respectively.
3. The device for preventing the blockage of the gas sampling passage according to claim 1, wherein the first gas filter (41) and the second gas filter (42) are both made of single-layer or multi-layer filter screens and/or filter membranes and/or filter paper in an overlapping mode.
4. The device for preventing the blockage of the gas sampling passage according to claim 1, wherein the gas detection pipeline (3) is made of a high-transparent flexible material, and the gas detection pipeline (3) shows spectral characteristics under the irradiation of light.
5. A device for preventing blockage of a gas sampling passage according to claim 2, wherein the first and second air cells (21, 22) are made of a highly elastic material and have a gas containing volume per unit length larger than the first and second gas hoses (11, 12).
6. A device for preventing blockage of a gas sampling passage according to claim 1, wherein flow meters for measuring the flow of gas are provided on the first gas hose (11) and the second gas hose (12).
7. A method of using the device of any one of claims 1 to 6 for preventing blockage of a gas sampling passage, comprising the steps of:
s1, setting working parameters of the gas sampling power mechanism (5), wherein the working parameters comprise a rotating speed and a forward and reverse rotation replacement frequency, and starting the gas sampling power mechanism (5);
and S2, purging and removing the deposits on the outer side walls of the first gas filter (41) and the second gas filter (42) by utilizing the positive and negative airflow provided by the gas sampling power mechanism (5), and performing spectrum detection on the gas at the gas detection pipeline (3).
8. The method of claim 7, wherein in step S2, the gas sampling power mechanism (5) is accelerated and decelerated to replace the rotation direction in both forward and reverse rotation.
9. The method according to claim 7, wherein step S2 further comprises:
and the gas flow is detected by using flow meters on the first gas hose (11) and the second gas hose (12), and when the gas flow is always smaller than a threshold value within a set time range, the working parameters of the gas sampling power mechanism (5) are reset, so that the initial rotation speed and/or the highest speed and/or the frequency of positive and negative rotation replacement are/is increased.
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| CN201811223554.2A CN109307612B (en) | 2018-10-19 | 2018-10-19 | Device and method for preventing gas sampling passage from being blocked |
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