CN109164837B - Flow constant device and using method thereof, rapid analysis instrument and detection method thereof - Google Patents
Flow constant device and using method thereof, rapid analysis instrument and detection method thereof Download PDFInfo
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- CN109164837B CN109164837B CN201810914695.2A CN201810914695A CN109164837B CN 109164837 B CN109164837 B CN 109164837B CN 201810914695 A CN201810914695 A CN 201810914695A CN 109164837 B CN109164837 B CN 109164837B
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- 238000001514 detection method Methods 0.000 title claims abstract description 67
- 238000004458 analytical method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 238000002156 mixing Methods 0.000 claims abstract description 94
- 238000001595 flow curve Methods 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 135
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 3
- RBFQJDQYXXHULB-UHFFFAOYSA-N arsane Chemical compound [AsH3] RBFQJDQYXXHULB-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 239000002341 toxic gas Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000070 arsenic hydride Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003891 environmental analysis Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
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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
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Abstract
The invention discloses a flow constant device and a using method thereof, a rapid analysis instrument and a detection method thereof, wherein the flow constant device comprises an air guide channel and an air pump, the air guide channel is used for introducing outside air, the air pump can be connected into the air guide channel in a driving manner, the air guide channel is provided with a pressure sensor, the pressure sensor is used for detecting the pressure of the air in an inner cavity of the air guide channel, a first adjusting device is arranged between the pressure sensor and the air pump in a driving manner, the first adjusting device is used for controlling the on-off of the air guide channel, the output end of the air pump is connected with a connecting channel, the output end of the connecting channel is provided with a gas-liquid mixing device, and the mixing device is used for receiving the air output by the air pump. According to the flow constant device, the pressure sensor and the gas to be detected are designed in a non-contact mode, so that the interference of the gas to be detected on the pressure sensor is effectively avoided, and the gas pump outputs the constant gas quantity.
Description
Technical Field
The invention relates to the field of environmental analysis, in particular to a flow constant device and a using method thereof. In addition, the invention also relates to a rapid analysis instrument comprising the flow constant device and a detection method thereof.
Background
The on-line analysis of environment for detecting partial components in the sample requires separating the component to be detected from the matrix (water body) and detecting in a gaseous state. In the detection process, the separation efficiency and the separation time of the components to be detected are directly influenced by the gas quantity, so that the gas quantity is constant. Constant flow measures are mainly constant pressure and constant flow. The artificial flow measurement adopts a flow measurement device mainly comprising a rotor flowmeter; the automatic flow measurement adopts a measurement device which is converted into flow in a pressure measurement mode, flow curves under different pressure conditions are drawn, analog quantity signals are fed back to a driving motor through pressure regulation, the control of rotating speed is realized, and the required constant flow is obtained. Pressure measurement often uses pressure sensors, and the measurement and control technology for gases with single components is well developed. But to the composition complicacy, for example moist, the great gas of water content, after measuring pressure through pressure sensor, convert the mode into analog signal control motor rotational speed, its effective performance receives great influence, leads to exporting the gas volume inaccurate, directly influences the precision that analytical instrument detected.
The analyzer uses an air pump to blow air into the solution, and part of small amount of water in the solution is brought out by the air in the form of water vapor, so that the accuracy of the determination is influenced. On one hand, the gas contains a certain amount of water vapor, the water vapor forms water drops in the pressure sensor, the pressure value can be changed, the pressure misjudgment is caused, and the pressure of the gas output by the gas pump is inaccurate. Especially for equipment needing circular blowing, a large amount of water and gas are circulated, and the pressure sensor cannot obtain an accurate value. On the other hand, the air pump is worn to a certain extent and cannot provide a constant air source. And if the constant air pump air quantity needs to be obtained, the air pump air quantity needs to be calibrated at regular time.
Disclosure of Invention
The invention provides a flow constant device and a using method thereof, a rapid analysis instrument and a detection method thereof, and aims to solve the technical problem that the output of an air pump is inaccurate due to interference of water vapor carried by humid or gas with large water content on a pressure sensor.
The utility model provides a flow constant device, including air guide channel and air pump, the air guide channel is used for leading-in external gas, the air pump can driven inserts the air guide channel, be equipped with pressure sensor on the air guide channel, pressure sensor is used for detecting the gaseous pressure of air guide channel inner chamber, be provided with first adjusting device between pressure sensor and the air pump drive connection, first adjusting device is used for controlling the break-make of air guide channel, the output of air pump even has the link channel, the output of link channel is equipped with gas-liquid mixing device, mixing arrangement is used for receiving the gas of air pump output.
Furthermore, the flow constant device also comprises a processing device which is arranged on the inlet end of the air guide channel and is used for drying and purifying the outside air.
Further, the flow constant device also comprises a detection device, and the detection device is used for analyzing gas components released by the gas-liquid mixing device; and the gas output end of the gas-liquid mixing device is pumped to the detection device by the gas pump for detection.
Furthermore, the flow constant device also comprises a circulating channel, and the circulating channel is positioned at the gas output end of the gas-liquid mixing device; and the output end of the circulating channel is provided with a second adjusting device for controlling the on-off of the circulating channel, and the circulating channel is communicated to the gas input end of the gas pump.
Further, the flow constant device also comprises a detection device, and the detection device is used for analyzing gas components released by the gas-liquid mixing device; the detection device is arranged on the circulation channel and/or the connecting channel.
Further, the circulating channel adopts at least one of a U-shaped channel, a V-shaped channel, an S-shaped channel, a W-shaped channel or a zigzag channel; the second adjusting device adopts at least one of a pneumatic valve, an electric valve, an electromagnetic valve and a manual valve.
Furthermore, the number of the detection devices is at least one, and a plurality of detection devices are connected in parallel; the detection device adopts a detection unit; alternatively, the detection device adopts a chromatographic column unit and a detection unit.
Further, the flow-constancy apparatus is for analyzing at least one of nitrogen, sulfur dioxide, nitric oxide, nitrogen dioxide, arsine and hydrogen cyanide; the first adjusting device adopts at least one of a pneumatic valve, an electric valve, an electromagnetic valve and a manual valve.
Further, the gas-liquid mixing device adopts a gas-liquid mixing pool; the gas-liquid mixing tank comprises a gas inlet end, and the gas inlet end is positioned at the bottom end of the gas-liquid mixing tank; the gas-liquid mixing tank comprises a gas outlet end which is arranged at the upper end of the gas-liquid mixing tank; the gas-liquid mixing pool comprises a liquid inlet and a liquid outlet, and the liquid outlet is positioned at the bottom of the gas-liquid mixing pool.
Further, the gas-liquid mixing tank is provided with a temperature adjusting device for heating or cooling; the gas-liquid mixing tank adopts a transparent gas-liquid mixing tank which is convenient for observing the gas circulation condition and the liquid level; the liquid height in the gas-liquid mixing tank is 2/3 of the height of the gas-liquid mixing tank.
According to another aspect of the present invention, there is also provided a method for using a flow-rate-constant device, comprising the steps of: opening a first adjusting device for controlling the on-off of the air guide channel, allowing external air to enter the air guide channel, starting an air pump and a pressure sensor for detecting the air pressure in an inner cavity of the air guide channel, converting the pressure value detected by the pressure sensor in the inner cavity of the air guide channel to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump through the adjustment of the pressure, and controlling the rotating speed of the air pump so that the air pump outputs constant air; and closing the first adjusting device, introducing the constant gas output by the gas pump into the gas-liquid mixing device through the connecting channel, and fully contacting the constant gas with the liquid contained in the gas-liquid mixing device.
Further, the method also comprises the step that outside air enters the processing unit through the air guide channel to be dried and purified; the calibration work of the air pump before the output air of the air pump is determined to be constant is also included; the air pump calibration work monitors the working state of the air pump according to the pressure value of the pressure sensor.
According to another aspect of the present invention, there is also provided a rapid analysis apparatus including the above flow rate constancy device.
According to another aspect of the present invention, there is also provided a method for detecting a rapid analysis instrument, comprising the steps of: opening a first adjusting device for controlling the on-off of the air guide channel, allowing external air to enter the air guide channel, starting an air pump and a pressure sensor for detecting the air pressure in an inner cavity of the air guide channel, converting the pressure value detected by the pressure sensor in the inner cavity of the air guide channel to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump through the adjustment of the pressure, and controlling the rotating speed of the air pump so that the air pump outputs constant air; and closing the first adjusting device, introducing the constant gas output by the gas pump into the gas-liquid mixing device through the connecting channel, fully contacting with the liquid contained in the gas-liquid mixing device, and introducing the gas released by the mixing device into the detection device for analysis.
According to another aspect of the present invention, there is also provided a method for detecting a rapid analysis instrument, comprising the steps of: opening a first adjusting device for controlling the on-off of the air guide channel, closing a second adjusting device for controlling the on-off of the circulating channel, allowing outside air to enter the air guide channel, starting an air pump and a pressure sensor for detecting the air pressure in an inner cavity of the air guide channel, converting the detected pressure value in the inner cavity of the air guide channel by the pressure sensor to draw flow curves under different pressure conditions, feeding an analog signal back to a driving motor of the air pump through the pressure adjustment, and controlling the rotating speed of the air pump so that the air pump outputs constant air; and closing the first adjusting device, opening the second adjusting device, introducing constant gas output by the gas pump into the gas-liquid mixing device through the connecting channel, fully contacting liquid contained in the gas-liquid mixing device, introducing gas released by the mixing device into the circulating channel, conveying the gas to the detecting device for analysis, and recovering the gas to the gas pump.
The invention has the following beneficial effects:
the flow constant device comprises an air guide channel, a pressure sensor, a first adjusting device, an air pump, a gas-liquid mixing device and a connecting channel, and is simple and compact in structure and convenient to operate. And the outside air enters from the air guide channel and flows into the gas-liquid mixing device through the pressure sensor and the air pump. The pressure sensor converts the detected pressure value in the air guide channel to draw a flow curve under different pressure conditions, and feeds back an analog signal to a driving motor of the air pump through pressure regulation, so that the control of the rotating speed of the air pump is realized, and the constant air quantity of the air pump is realized; the first adjusting device closes the air guide channel, and the air pump continuously and constantly outputs air. The first adjusting device effectively isolates gas circulation between the pressure sensor and the air pump, and effectively avoids the interference of gas to be detected on the pressure sensor. And, pressure sensor can accurately judge whether air pump is in normal operating condition. The pressure sensor and the gas to be measured in the flow constant device are designed in a non-contact mode, misjudgment of the pressure sensor is avoided, and the constant gas quantity output by the gas pump is accurately guaranteed. The non-contact design with the gas to be measured can also prolong the service life of the flow constant device and save the cost.
The rapid analysis instrument comprises a flow constant device, wherein a pressure sensor and gas to be detected in the flow constant device are designed in a non-contact mode, and online rapid and accurate detection of gas components is achieved. The rapid analysis instrument is simple in structure and convenient to operate, an automatic detection mode can be adopted, and labor cost is saved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a flow-rate-constancy apparatus of a preferred embodiment of the present invention; and
FIG. 2 is a schematic view of a flow rate stabilizing device including a circulation path according to a preferred embodiment of the present invention.
Description of reference numerals:
1. a processing device; 2. an air guide channel; 3. a pressure sensor; 4. a first adjusting device; 5. an air pump; 6. a gas-liquid mixing device; 7. a circulation channel; 8. a second adjustment device; 9. a connecting channel.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic view of a flow-rate-constancy apparatus of a preferred embodiment of the present invention; FIG. 2 is a schematic view of a flow rate stabilizing device including a circulation path according to a preferred embodiment of the present invention.
As shown in fig. 1, the flow constant device of this embodiment, including air guide channel 2 and air pump 5, air guide channel 2 is used for leading-in external gas, air pump 5 driveably inserts air guide channel 2, be equipped with pressure sensor 3 on the air guide channel 2, pressure sensor 3 is used for detecting the gaseous pressure of air guide channel 2 inner chamber, be provided with first adjusting device 4 between pressure sensor 3 and the air pump 5 drive connection, first adjusting device 4 is used for controlling the break-make of air guide channel 2, the output of air pump 5 even has linking channel 9, the output of linking channel 9 is equipped with gas-liquid mixing device 6, gas-liquid mixing device 6 is used for receiving the gas of air pump 5 output. The flow constant device comprises an air guide channel 2, a pressure sensor 3, a first adjusting device 4, an air pump 5, a gas-liquid mixing device 6 and a connecting channel 9, and is simple and compact in structure and convenient to operate. The outside air enters from the air guide channel and passes through the pressure sensor 3 and the air pump 5 to the gas-liquid mixing device 6. The pressure sensor 3 converts the detected pressure value in the air guide channel 2 to draw a flow curve under different pressure conditions, and feeds back an analog signal to a driving motor of the air pump 5 through pressure regulation, so that the control of the rotating speed of the air pump 5 is realized, and the constant air quantity of the air pump is realized; the first adjusting device 4 closes the air guide channel, and the air pump 5 continuously and constantly outputs air. The first adjusting device 4 effectively isolates the gas circulation between the pressure sensor 3 and the air pump 5, and effectively avoids the interference of the gas to be measured on the pressure sensor 3. And, the pressure sensor 3 can accurately determine whether the air pump 5 is in a normal operating state. The pressure sensor 3 and the gas to be measured in the flow constant device adopt a non-contact design, so that misjudgment of the pressure sensor 3 is avoided, and the constant gas output of the air pump 5 is accurately ensured. The non-contact design with the gas to be measured can also prolong the service life of the flow constant device and save the cost.
As shown in fig. 1, in this embodiment, the flow rate stabilizing device further includes a processing device 1, and the processing device 1 is disposed at the inlet end of the gas guide channel 2 and is used for drying and purifying the outside air. The processing device 1 improves the purity of air components in the air guide channel 2, improves the stability of output air quantity and improves the detection precision. And the influence on the detection accuracy caused by the reaction of certain components of the external gas and the liquid to be detected when the external gas is introduced into the gas-liquid mixing device 6 is avoided.
As shown in fig. 1, in the present embodiment, the flow rate constancy means further includes detection means for analyzing the gas components released from the gas-liquid mixing device 6. And the gas output end of the gas-liquid mixing device 6 is pumped to the detection device by the gas pump 5 for detection. The detection device is used for detecting the gas released by the gas-liquid mixing device 6, and the pressure value range of the pressure sensor 3 or the accuracy grade of the pressure sensor 3 is selected according to the gas amount detection design.
As shown in fig. 2, in the present embodiment, the flow rate stabilizing device further includes a circulation passage 7, and the circulation passage 7 is located at the gas output end of the gas-liquid mixing device 6. The output end of the circulating channel 7 is provided with a second adjusting device 8 for controlling the on-off of the circulating channel 7, and the circulating channel 7 is communicated to the gas input end of the gas pump 5. The arrangement of the circulating channel 7 enables gas released by the gas-liquid mixing device 6 to form a closed pipeline, the second adjusting device 8 opens the circulating channel 7, the first adjusting device 4 closes the gas guide channel 2, the circulating channel 7, the gas pump 5, the connecting channel 9 and the gas-liquid mixing device 6 form a closed pipeline, and gas tightness is guaranteed. Is suitable for recovering toxic gas and preventing the toxic gas from being discharged into the atmosphere to pollute the environment.
As shown in fig. 2, in the present embodiment, the flow rate constancy means further includes detection means for analyzing the gas components released from the gas-liquid mixing device 6. The detection device is arranged on the circulation channel 7 and/or on the connecting channel 9. The gas released by the gas-liquid mixing device 6 enters the circulating closed pipeline, the internal gas is constant, and the detection device can be arranged at any position in the circulating closed pipeline.
In this embodiment, the circulation channel 7 is at least one of a U-shaped channel, a V-shaped channel, an S-shaped channel, a W-shaped channel, or a zigzag channel. The second adjusting device 8 employs at least one of a pneumatic valve, an electric valve, an electromagnetic valve, and a manual valve. The circulating channel 7 is connected to the output end of the mixing device 6, released gas can contain water vapor or gas suspended matters, the circulating channel 7 adopts a U-shaped channel, a V-shaped channel, an S-shaped channel, a W-shaped channel or a zigzag channel, the path of the gas is increased, the water vapor which is brought out is precooled to form liquid drops which flow back to the mixing device 6, the pollution of the water vapor to the air pump 5 is reduced, the performance of the air pump 5 is prevented from being reduced, and the service life of the air pump 5 is prolonged. Optionally, the circulation channel 7 is provided with a cooling device to accelerate the cooling back flow of the moisture.
As shown in fig. 2, in this embodiment, there is at least one detection device, and a plurality of detection devices are connected in parallel. The aforesaid can set up a plurality of detection device, detection device parallel connection realizes that multiple gas detects simultaneously, keeps waiting to detect the identity of liquid sample, improves detection efficiency and degree of accuracy. Optionally, the detection device employs a detection unit; alternatively, the detection device adopts a chromatographic column unit and a detection unit. The gas released from the gas-liquid mixing device 6 contains impurities, and the detection effect is affected by low purity. The chromatographic column unit can improve the gas purity, reach the detection standard and improve the detection sensitivity.
As shown in fig. 1 and 2, in the present embodiment, the flow rate constant device is used to analyze at least one of nitrogen, sulfur dioxide, nitric oxide, nitrogen dioxide, arsine and hydrogen cyanide. The first adjusting device 4 employs at least one of a pneumatic valve, an electric valve, an electromagnetic valve, and a manual valve. The flow constant device is suitable for measuring and analyzing nitrogen, sulfur dioxide, nitric oxide, nitrogen dioxide, arsenic hydride and hydrogen cyanide, and has a wide application range. When toxic gas is analyzed, the circulating channel 7 is needed to be recycled, so that air pollution is avoided.
As shown in fig. 1 and 2, in the present embodiment, the gas-liquid mixing device 6 employs a gas-liquid mixing tank. The gas-liquid mixing device 6 adopts a gas-liquid mixing tank which can contain strong acid, strong alkali and corrosive liquid, the application range is wide, and the liquid stably exists in the gas-liquid mixing tank. Optionally, the gas-liquid mixing tank comprises a gas inlet end, and the gas inlet end is located at the bottom end of the gas-liquid mixing tank. The gas-liquid mixing tank comprises a gas outlet end, and the gas outlet end is positioned at the upper end of the gas-liquid mixing tank. The gas-liquid mixing pool comprises a liquid inlet and a liquid outlet, and the liquid outlet is positioned at the bottom of the gas-liquid mixing pool. Air pump 5 inputs gas to gas-liquid mixture pond bottom through connecting channel 9, and gas lets in the liquid in the gas-liquid mixture pond completely for gas and the maximum contact of liquid are favorable to the gaseous complete release that awaits measuring, guarantee to examine the accuracy of side. Gas is released from the upper end of the liquid level, and the gas outlet end at the upper end of the gas-liquid mixing pool is connected with the circulating channel 7 to form a closed passage, so that the emission of harmful and corrosive gases is effectively reduced. The liquid inlet and the liquid outlet facilitate the liquid to enter the gas-liquid mixing pool and be discharged from the gas-liquid mixing pool, and each device of the device does not need to be disassembled, so that the air tightness of the flow constant device is influenced. The liquid to be detected can be continuously replaced by arranging the sample inlet and the liquid outlet, so that automatic continuous operation is realized, and the detection efficiency is improved.
As shown in fig. 1 and 2, in the present embodiment, the gas-liquid mixing tank is provided with a temperature adjusting device for heating or cooling. The gas-liquid mixing tank is provided with a temperature adjusting device, so that the most suitable temperature adjustment can be carried out according to the physical and chemical properties of the released gas and the liquid to be detected, and the release of the gas is accelerated. Optionally, the gas-liquid mixing tank adopts a transparent gas-liquid mixing tank which is convenient for observing the gas circulation condition and the liquid level. Above-mentioned transparent gas-liquid mixture pond can observe the liquid level condition, avoids the liquid to spill over. Meanwhile, the bubble condition in the liquid can be observed to determine whether the output gas quantity of the gas pump 5 is constant. Optionally, the liquid height in the gas-liquid mixing tank is 2/3 of the gas-liquid mixing tank height. Due to the appropriate liquid level height, the volatilized water vapor can flow back, and the subsequent water vapor treatment work and the influence on the accuracy of a detection result are avoided.
As a general inventive concept, the present invention also provides a method of using a flow-rate-invariable device, comprising the steps of: opening a first adjusting device 4 for controlling the on-off of the air guide channel 2, allowing outside air to enter the air guide channel 2, starting an air pump 5 and a pressure sensor 3 for detecting the air pressure in the inner cavity of the air guide channel 2, converting the pressure value detected in the inner cavity of the air guide channel 2 by the pressure sensor 3 to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump 5 through the adjustment of the pressure, and controlling the rotating speed of the air pump 5 so that the air pump outputs constant air; the first adjusting device 4 is closed, and the constant gas output by the gas pump 5 is introduced into the gas-liquid mixing device 6 through the connecting channel 9 and fully contacts with the liquid contained in the gas-liquid mixing device 6. The flow constant device comprises an air pump 5, a pressure sensor 3, a first adjusting device 4, a gas-liquid mixing device 6, an air guide channel 2 and a connecting channel 9, and is simple and compact in structure and convenient to install and detach. The pressure sensor 3 and the gas to be measured in the flow constant device adopt a non-contact design, so that misjudgment of the pressure sensor 3 is avoided, and the output constant gas quantity of the gas pump 5 is accurately ensured.
As shown in fig. 1, in this embodiment, the method further includes that the external air enters the processing unit through the air guide channel for drying and purification. The purity of air components in the air guide channel 2 is improved, the stability of output air quantity is improved, and the detection precision is improved.
As shown in fig. 1, the present embodiment further includes calibration of the air pump 5 before determining that the output air of the air pump is constant; the calibration work of the air pump 5 monitors the working state of the air pump 5 according to the pressure value of the pressure sensor 3.
The method comprises the following specific steps: opening a first adjusting device 4, allowing external gas to enter through a gas guide channel 2, starting an air pump 5 to enable the gas to pass through a pressure sensor 3, the air pump 5, a connecting channel 9 and a gas-liquid mixing device 6, discharging gas reserved by a flow constant device, starting the pressure sensor 3, calibrating the air pump 5, calibrating the qualified air pump 5, converting the detected pressure value of an inner cavity of the gas guide channel 2 by the pressure sensor 3 to draw a flow curve under different pressure conditions, feeding back an analog signal to a driving motor of the air pump 5 through pressure adjustment, and controlling the rotating speed of the air pump 5 to enable the air pump 5 to output the constant gas;
and closing the first adjusting device 4, introducing the constant gas output by the gas pump 5 into the gas-liquid mixing device 6 through the connecting channel 9, stopping outputting the gas by the flow constant device in the whole period, and readjusting the gas output by the gas pump 5 in the next period according to the flow so as to ensure that the gas pump 5 outputs the constant gas in the working process of each period.
As a general inventive concept, the present invention also provides a rapid analysis apparatus including the above flow rate constancy device. The rapid analysis instrument comprises a flow constant device, wherein a pressure sensor 3 in the flow constant device and a gas to be detected are designed in a non-contact mode, and online rapid and accurate gas component detection is achieved. The rapid analysis instrument is simple in structure and convenient to operate, an automatic detection mode can be adopted, and labor cost is saved.
As a general inventive concept, the present invention also provides a detection method of a rapid analysis instrument, comprising the steps of: opening a first adjusting device 4 for controlling the on-off of the air guide channel 2, allowing outside air to enter the air guide channel 2, starting an air pump 5 and a pressure sensor 3 for detecting the air pressure in the inner cavity of the air guide channel 2, converting the pressure value detected in the inner cavity of the air guide channel 2 by the pressure sensor 3 to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump 5 through the adjustment of the pressure, and controlling the rotating speed of the air pump 5 so that the air pump outputs constant air; and closing the first adjusting device 4, introducing the constant gas output by the gas pump 5 into the gas-liquid mixing device 6 through the connecting channel 9, fully contacting with the liquid contained in the gas-liquid mixing device 6, and introducing the gas released by the mixing device 6 into the detection device for analysis. The detection method of the rapid analysis instrument is convenient to operate, the pressure sensor 3 and the gas to be detected are designed in a non-contact mode through opening and closing of the first adjusting device 4, misjudgment caused by the fact that the pressure sensor 3 is influenced by the gas to be detected is avoided, the fact that the gas pump 5 outputs constant gas quantity is guaranteed, the gas is released constantly by the gas-liquid mixing device 6, and the detection accuracy of the detection device is effectively improved.
As a general inventive concept, the present invention also provides a detection method of a rapid analysis instrument, comprising the steps of: opening a first adjusting device 4 for controlling the on-off of the air guide channel 2, closing a second adjusting device 8 for controlling the on-off of the circulating channel 7, allowing outside air to enter the air guide channel 2, starting an air pump 5 and a pressure sensor 3 for detecting the air pressure in an inner cavity of the air guide channel 2, converting the detected pressure value in the inner cavity of the air guide channel 2 by the pressure sensor 3 to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump 5 through the adjustment of the pressure, and controlling the rotating speed of the air pump 5 so that the air pump outputs constant air; the first adjusting device 4 is closed, the second adjusting device 8 is opened, the constant gas output by the air pump 5 is introduced into the gas-liquid mixing device 6 through the connecting channel 9, the constant gas is fully contacted with the liquid contained in the gas-liquid mixing device 6, the gas released by the mixing device 6 enters the circulating channel 7, the gas is conveyed to the detecting device for analysis, and the gas is recycled to the air pump 5. The double-adjusting device effectively avoids the pressure sensor 3 from contacting with the gas to be detected, and forms a closed return pipeline through the circulating channel 7, so that the gas is prevented from being discharged out of the rapid analysis instrument to pollute the environment.
The method comprises the following specific steps: opening the first adjusting device 4, closing the second adjusting device 8, allowing external gas to enter through the gas guide channel 2, opening the air pump 5, allowing the gas passing through the drying agent to pass through the pressure sensor 3, the air pump 5, the connecting channel 9 and the gas-liquid mixing device 6, discharging the gas reserved by the flow constant device, opening the pressure sensor 3, calibrating the air pump 5, calibrating the qualified air pump 5, converting the detected pressure value of the external gas into a flow curve under different pressure conditions, and feeding an analog signal back to a driving motor of the air pump 5 through pressure adjustment to control the rotating speed of the air pump 5 so that the air pump outputs the constant gas;
the first adjusting device 4 is closed, the second adjusting device 8 is opened, the constant gas output by the air pump 5 is introduced into the gas-liquid mixing device 6 through the connecting channel 9, the gas released by the liquid mixing device 6 is absorbed through the circulating channel 7, enters the circulating channel 7 and is conveyed to the detection device for detection, the detection device firstly performs chromatographic column unit purification, then enters the detection unit for detection and analysis, and the detected gas is recovered to the air pump 5. In the next period, the output gas quantity of the air pump 5 is readjusted according to the above procedure, so as to ensure that the air pump 5 outputs a constant gas quantity in the working process of each period.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A flow rate stabilizing device is characterized in that,
comprises an air guide channel (2) and an air pump (5), wherein the air guide channel (2) is used for introducing outside air, the air pump (5) can be driven to be connected into the air guide channel (2),
the air guide channel (2) is provided with a pressure sensor (3), the pressure sensor (3) is used for detecting the pressure of air in the inner cavity of the air guide channel (2), a first adjusting device (4) is arranged between the pressure sensor (3) and the air pump (5) in a driving connection way, the first adjusting device (4) is used for controlling the on-off of the air guide channel (2),
the output end of the air pump (5) is connected with a connecting channel (9), the output end of the connecting channel (9) is provided with a gas-liquid mixing device (6), and the mixing device (6) is used for receiving the gas output by the air pump (5);
the flow constant device further comprises a circulating channel (7), and the circulating channel (7) is arranged at the gas output end of the gas-liquid mixing device (6);
and the output end of the circulating channel (7) is provided with a second adjusting device (8) for controlling the on-off of the circulating channel (7), and the circulating channel (7) is communicated to the gas input end of the gas pump (5).
2. Flow-rate-constancy apparatus according to claim 1,
the flow constant device further comprises a processing device (1), and the processing device (1) is arranged at the inlet end of the air guide channel (2) and used for drying and purifying the outside air.
3. Flow-rate-constancy apparatus according to claim 1,
the flow constant device also comprises a detection device used for analyzing the gas components released by the gas-liquid mixing device (6);
and the gas output end of the gas-liquid mixing device (6) is pumped to the detection device by the gas pump (5) for detection.
4. Flow-rate-constancy apparatus according to claim 1,
the flow constant device also comprises a detection device used for analyzing the gas components released by the gas-liquid mixing device (6);
the detection device is arranged on the circulation channel (7) and/or the connecting channel (9).
5. Method for using a device for constancy of flow, characterised in that the use of a device for constancy of flow according to any of claims 1 to 4 comprises the following steps
Opening a first adjusting device (4) for controlling the on-off of the air guide channel (2), allowing outside air to enter the air guide channel (2), starting an air pump (5) and a pressure sensor (3) for detecting the air pressure in the inner cavity of the air guide channel (2), converting the pressure value detected in the inner cavity of the air guide channel (2) by the pressure sensor (3) to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump (5) through the adjustment of the pressure, and controlling the rotating speed of the air pump (5) to enable the air pump to output constant air;
and closing the first adjusting device (4), introducing the constant gas output by the air pump (5) into the gas-liquid mixing device (6) through a connecting passage (9), and fully contacting the constant gas with the liquid contained in the gas-liquid mixing device (6).
6. The method of using a flow-rate-invariant device of claim 5,
the device also comprises a gas guide channel (2) through which the outside gas enters the processing unit (1) for drying and purification;
the calibration work of the air pump (5) before the output air of the air pump (5) is constant is determined;
the air pump (5) is calibrated and monitors the working state of the air pump (5) according to the pressure value of the pressure sensor (3).
7. A rapid analysis apparatus comprising a flow constancy device as claimed in any one of claims 1 to 4.
8. A detection method of a rapid analysis instrument is characterized by comprising the following steps:
opening a first adjusting device (4) for controlling the on-off of the air guide channel (2), closing a second adjusting device (8) for controlling the on-off of the circulating channel (7), allowing outside air to enter the air guide channel (2), opening an air pump (5) and a pressure sensor (3) for detecting the air pressure in an inner cavity of the air guide channel (2), converting the detected pressure value in the inner cavity of the air guide channel (2) by the pressure sensor (3) to draw a flow curve under different pressure conditions, feeding an analog signal back to a driving motor of the air pump (5) through the adjustment of the pressure, and controlling the rotating speed of the air pump (5) to enable the air pump to output constant air;
the first adjusting device (4) is closed, the second adjusting device (8) is opened, the constant gas output by the air pump (5) is introduced into the gas-liquid mixing device (6) through the connecting channel (9) and is fully contacted with the liquid contained in the gas-liquid mixing device (6), the gas released by the mixing device (6) enters the circulating channel (7) and is conveyed to the detection device for analysis, and the gas is recovered to the air pump (5).
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