CN113295243B - Negative pressure type gas standard detection device based on sonic nozzle - Google Patents
Negative pressure type gas standard detection device based on sonic nozzle Download PDFInfo
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- CN113295243B CN113295243B CN202110551008.7A CN202110551008A CN113295243B CN 113295243 B CN113295243 B CN 113295243B CN 202110551008 A CN202110551008 A CN 202110551008A CN 113295243 B CN113295243 B CN 113295243B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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Abstract
The invention belongs to the technical field of gas detection, and particularly relates to a negative pressure type gas standard detection device based on a sonic nozzle, which comprises a sonic nozzle element, a vacuum pump, a gas storage tank, a switch valve, a collecting pipe, a stagnation container, a first temperature detector, a first pressure detector, a straight pipe, a controller and a detected meter; one end of the straight pipe is communicated with the stagnation container, and the outer wall of the straight pipe is provided with a measured meter; a second temperature detector and a second pressure detector are arranged on two sides of the measured meter; one end of the sonic nozzle element is communicated with one side of the stagnation container far away from the straight pipe; according to the invention, through the arrangement of the dehumidification pipe, water vapor carried by gas is condensed on the inner wall of the dehumidification pipe, so that the water vapor carried by the gas entering the stagnation container through the dehumidification pipe is reduced, the gas humidity in the stagnation container is reduced, the calculation precision reduction of the air density, the air gas constant and the critical flow function caused by the gas humidity in the stagnation container is reduced, and the gas standard detection precision is improved.
Description
Technical Field
The invention belongs to the technical field of gas detection, and particularly relates to a negative pressure type gas standard detection device based on a sonic nozzle.
Background
The sonic nozzle is also called as a Venturi nozzle, is used for measuring gas flow, and has wide application in the fields of petroleum, chemical industry, energy conservation, aviation and aerospace; the measurement of gas flow is mainly affected by temperature, pressure and humidity; particularly for the aviation field, the accuracy of an air flow test result of a component of an aircraft engine needs to be improved, and the error of a flow test system needs to be controlled and reduced, so that the field has high requirements on the measurement accuracy of gas flow; since the magnitude of the air humidity affects the air density, the air gas constant and the magnitude of the critical flow function.
For the introduction of the negative pressure type gas standard detection device based on the sonic nozzle, reference can be made to: lie peng et al, influence of humidity measurement on performance of sonic nozzle flow device [ J ], metering technique, 2017 (No. 1) 30-32; the influence of humidity measurement on the measurement result of the sonic nozzle flow device is considered during critical flow calculation, and particularly when the humidity difference between the indoor environment and the outdoor environment is large, the influence of the humidity on the metering performance of the sonic nozzle gas flow standard device under the environment condition is large, so that the metering error of the sonic nozzle gas flow standard device is large; the article analyzes the influence degree of humidity on a measurement result by two methods of theoretical calculation and measurement of the meter coefficient of the flowmeter, thereby giving reasonable suggestions to ensure that the device keeps good metering performance in daily work; the article does not explicitly suggest a specific solution to this problem.
In view of this, the invention provides a negative pressure type gas standard detection device based on a sonic nozzle, and solves the technical problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a negative pressure type gas standard detection device based on a sonic nozzle.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a negative pressure type gas standard detection device based on a sonic nozzle, which comprises a sonic nozzle element, a vacuum pump, a gas storage tank, a switch valve, a collecting pipe, a stagnation container, a first temperature detector, a first pressure detector, a straight pipe, a controller and a measured meter, wherein the sonic nozzle element is arranged on the vacuum pump; one end of the straight pipe is communicated with the stagnation container, and the outer wall of the straight pipe is provided with a measured meter; a second temperature detector and a second pressure detector are arranged on two sides of the measured meter; one end of the sonic nozzle element is communicated with one side of the stagnation container far away from the straight pipe, and the other end of the sonic nozzle element is communicated with the collecting pipe; the sonic nozzle element is communicated with the collecting pipe through a switch valve; the first temperature detector and the first pressure detector are arranged on the stagnation container and are positioned on two sides of the sonic nozzle element; the gas storage tank is communicated with the collecting pipe; the vacuum pump is communicated with the air storage tank; the controller is used for controlling the gas standard detection device to automatically operate;
one end of the straight pipe, which is far away from the measured meter, is in threaded connection with a dehumidification pipe; a first cavity is formed in the pipe wall of the dehumidification pipe; the outer wall of the dehumidification pipe is provided with a water inlet and a water outlet; the water inlet and the water outlet are respectively positioned at two ends of the dehumidification pipe; the water inlet is positioned below the water outlet; the inner wall of the dehumidification pipe is fixedly connected with a water absorption sponge;
in the prior art, because the size of the air humidity affects the size of the air density, the air gas constant and the critical flow function, the calculation accuracy of the air density, the air gas constant and the critical flow function is reduced; particularly, when the outside is in humid and rainy weather, the difference value is generated in the calculated gas critical flow function due to inaccurate measurement of atmospheric humidity;
when in work, when in wet rainy weather; the staff controls the vacuum pump to evacuate the gas in the gas storage tank through the controller, and then the cooling water is introduced from the water inlet; cooling water enters the first cavity and fills the first cavity, and the cooling water in the first cavity flows out of the water outlet; then opening the switch valve, and then enabling the outside air to enter the straight pipe through the dehumidification pipe and enter the stagnation container through the straight pipe; at the moment, the second temperature detector, the second pressure detector and the measured meter detect and record the airflow in the straight pipe; in the process that gas enters the dehumidifying pipe, cooling water is introduced into a cavity I in the dehumidifying pipe, so that the temperature of the inner wall of the dehumidifying pipe is reduced, the gas is introduced into the dehumidifying pipe and is in contact with the inner wall of the dehumidifying pipe, water vapor carried in the wet gas is condensed into water drops on the inner wall of the dehumidifying pipe when the water drops are cooled, the water drops on the inner wall of the dehumidifying pipe roll along the inner wall of the dehumidifying pipe under the blowing of the gas along with the gas continuously entering the dehumidifying pipe, the water drops are in contact with the water-absorbing sponge and are absorbed by the water-absorbing sponge until the gas enters the stagnation container and the air pressure in the stagnation container is stable, numerical values displayed by a temperature detector I and a pressure detector I are observed and recorded, and after the standard detection of the gas is finished, the dehumidifying pipe is taken down and the water-absorbing sponge is dried;
according to the invention, through the arrangement of the dehumidification pipe, water vapor carried by gas is condensed on the inner wall of the dehumidification pipe, so that the water vapor carried by the gas entering the stagnation container through the dehumidification pipe is reduced, the gas humidity in the stagnation container is reduced, the calculation precision reduction of the air density, the air gas constant and the critical flow function caused by the gas humidity in the stagnation container is reduced, and the gas standard detection precision is improved.
Preferably, the inner wall of the dehumidification pipe is fixedly connected with a dehumidification plate; the dehumidification plate is spiral in shape, a second cavity is formed in the dehumidification plate, and the dehumidification plate inclines towards the inner wall of the dehumidification pipe along the center of the dehumidification pipe; the second cavity is communicated with the first cavity; the water absorption sponge is spirally wound on the edge of the windward side of the dehumidification board; when the dehumidifying plate works, cooling water enters the first cavity from the water inlet, so that the cooling water in the first cavity enters the second cavity, and the cooling water in the second cavity cools the dehumidifying plate; when the gas enters the dehumidifying pipe, the gas is in contact with the surface of the dehumidifying plate, so that water vapor carried in the gas is condensed on the surface of the dehumidifying plate, the condensed volume of the gas is increased, the condensation amount of the water vapor in the gas on the surface of the dehumidifying plate is increased, the water vapor in the gas is reduced, and the humidity of the gas in the stagnation container is reduced; the dehumidifying plate inclines towards the inner wall of the dehumidifying pipe along the center of the dehumidifying pipe, so that in the process that gas flows along the dehumidifying plate, the gas entering from the center of the dehumidifying pipe flows towards the inner wall of the dehumidifying pipe along the surface of the dehumidifying plate, and water vapor carried by the gas at the center of the dehumidifying pipe is condensed into water drops on the inner wall of the dehumidifying pipe, so that the water vapor carried by the gas entering the dehumidifying pipe is further reduced, and the dehumidifying plate plays a guiding role for the gas along with the introduction of the gas, so that the water drops condensed on the surface of the dehumidifying plate are in contact with the water absorbing sponge under the blowing of the gas and are absorbed by the water absorbing sponge; because the dehumidifying plate is spiral, the gas entering the straight pipe through the dehumidifying plate is mixed more uniformly, so that the difference of the humidity, the temperature and the pressure of the gas at each position in the straight pipe is reduced, and the detection accuracy of the temperature detector, the pressure detector and the detected meter at the straight pipe is further ensured; according to the invention, through the arrangement of the dehumidification plate, not only can the water vapor carried by the gas introduced into the dehumidification pipe be condensed on the surface of the dehumidification plate to reduce the content of the water vapor in the gas, but also the gas in the center of the dehumidification pipe is in contact with the inner wall of the dehumidification pipe under the guiding action of the dehumidification plate, so that the water vapor carried by the gas in the center of the dehumidification pipe is condensed on the inner wall of the dehumidification pipe, the content of the water vapor in the dehumidification pipe is reduced, and the dehumidification effect of the dehumidification pipe is improved; further improving the practical application effect of the invention.
Preferably, the inner wall of the dehumidifying plate is provided with a spiral groove; the spiral grooves are distributed along the edge profile of the dehumidification plate, and the elastic plate is connected in the spiral grooves in a sliding mode; the water-absorbing sponge is fixedly connected to the elastic plate; when the water absorption device works, the water absorption sponge is guided to enter the spiral groove by the elastic plate; aligning one end of the elastic plate with the spiral groove; pushing the elastic plate to insert into the spiral groove, and exposing the spiral groove at the other end of the elastic plate; when water drops condensed on the surface of the dehumidifying board flow to the inner wall of the dehumidifying pipe under the blowing of gas, the water drops enter the spiral groove to contact with the water absorbing sponge and are absorbed by the water absorbing sponge; when the detection is finished, a worker pulls the other end of the elastic plate to draw out the elastic plate from the spiral groove, so that the elastic plate drives the water absorption sponge to be separated from the spiral groove, and the water absorption sponge is dried; according to the invention, the spiral groove is matched with the water-absorbing sponge through the arrangement of the spiral groove, so that the water-absorbing sponge can be stored in the spiral groove; on one hand, water drops on the surface of the dehumidifying plate and on the inner wall of the dehumidifying pipe are absorbed, the water-absorbing sponge is prevented from occupying the inner space of the dehumidifying pipe, the dehumidifying efficiency of the dehumidifying pipe on gas is improved, on the other hand, the contact area of the water-absorbing sponge and the gas is reduced, the volatile water carried by the gas away from the surface of the water-absorbing sponge is reduced, the humidity of the gas entering the straight pipe through the dehumidifying pipe is reduced, and the practical application effect of the dehumidifying pipe is improved.
Preferably, the upper surface of the dehumidification pipe is fixedly connected with an air inlet pipe; the air inlet pipe is communicated with the interior of the dehumidification pipe, is close to the leeward side of the dehumidification plate, and is communicated with the interior of the dehumidification pipe, the air flow introduced into the air inlet pipe is one cubic meter per hour, and a permeable membrane sleeve is connected in the air inlet pipe in a sliding manner; anhydrous copper sulfate crystals are filled in the osmotic membrane sleeve; when the device works, the permeable membrane sleeve is inserted into the air inlet pipe, when the switch valve is opened, external air enters the dehumidification pipe through the air inlet pipe, so that anhydrous copper sulfate crystals inserted into the air inlet pipe absorb water vapor carried by the air, the humidity of the air entering the air inlet pipe is reduced, and the anhydrous copper sulfate crystals change from white to blue-green after absorbing water, so that whether the anhydrous copper sulfate crystals fail can be judged by observing the color of the anhydrous copper sulfate crystals, whether the anhydrous copper sulfate crystals need to be replaced is determined, and after the measurement is finished, the gas flow introduced into the air inlet pipe is subtracted from the reading of the measured meter, so that the gas standard quantity needing to be detected is obtained; the method comprises the following steps of (1) opening a side wall of a dehumidifying pipe, inserting an air inlet pipe, and welding the air inlet pipe and the side wall of the dehumidifying pipe; according to the invention, through the matching of the air inlet pipe and the anhydrous copper sulfate crystal, the external air is dried under the filtration of the anhydrous copper sulfate crystal, so that the dehumidification effect of the dehumidification pipe is improved, and the anhydrous copper sulfate crystal is installed from the outside of the dehumidification pipe, so that the observation and the replacement are convenient, and the practical application effect of the invention is improved.
Preferably, the air inlet pipe faces the leeward side of the dehumidification plate, the shape of the air inlet pipe is horn-shaped, and the horn-shaped air inlet pipes are distributed along the pipe wall of the dehumidification pipe in a large-size mode and a small-size mode; when the dehumidifying pipe works, when external gas enters the dehumidifying pipe through the air inlet pipe, the air inlet pipe is horn-shaped, the gas introduction amount is unchanged, the cross section of the air inlet pipe is reduced, the flow velocity of the gas through the air inlet pipe is accelerated, the flow velocity of the gas in the dehumidifying pipe is accelerated, the impact force of the gas is improved, the gas can blow condensed water drops on the lee side of the dehumidifying plate to move towards the inner wall of the dehumidifying pipe along the lee side of the dehumidifying plate, the water drops are moved into the spiral groove along the inner wall of the dehumidifying pipe, the condensed water drops on the lee side of the dehumidifying plate are absorbed by the water-absorbing sponge, and the practical application effect of the dehumidifying pipe is further improved.
Preferably, the windward side of the dehumidifying plate is fixedly connected with a convex strip; the convex strips are inclined towards the spiral groove; during operation, the gas entering through the gas inlet pipe blows the condensed water mist on the surface of the dehumidifying board to flow to the windward side of the convex strips, so that the water mist is gathered into water drops, the water drops move towards the spiral grooves along the windward side of the convex strips under the blowing of the gas, the convex strips play a role in guiding the condensed water on the surface of the dehumidifying board, the condensed water on the surface of the dehumidifying board can be conveniently absorbed by the water absorption sponge, the volatilization amount of the condensed water is reduced, the gas is reduced, the volatile condensed water driven by the gas is reduced, the dehumidifying effect of the dehumidifying pipe is kept, and the actual application effect of the dehumidifying pipe is further improved.
The invention has the following beneficial effects:
1. according to the invention, through the arrangement of the dehumidifying pipe, water vapor carried by the gas is condensed on the inner wall of the dehumidifying pipe, so that the water vapor carried by the gas entering the stagnation container through the dehumidifying pipe is reduced, the humidity of the gas in the stagnation container is reduced, the calculation precision reduction of the air density, the air gas constant and the critical flow function caused by the humidity of the gas in the stagnation container is reduced, and the precision of gas standard detection is improved.
2. According to the invention, through the arrangement of the dehumidification plate, not only can the water vapor carried by the gas introduced into the dehumidification pipe be condensed on the surface of the dehumidification plate to reduce the content of the water vapor in the gas, but also the gas in the center of the dehumidification pipe is in contact with the inner wall of the dehumidification pipe under the guiding action of the dehumidification plate, so that the water vapor carried by the gas in the center of the dehumidification pipe is condensed on the inner wall of the dehumidification pipe, the content of the water vapor in the dehumidification pipe is reduced, and the dehumidification effect of the dehumidification pipe is improved; further improving the practical application effect of the invention.
3. According to the invention, the spiral groove is matched with the water-absorbing sponge through the arrangement of the spiral groove, so that the water-absorbing sponge can be stored in the spiral groove; on one hand, water drops on the surface of the dehumidifying plate and on the inner wall of the dehumidifying pipe are absorbed, the water absorption sponge is prevented from occupying the inner space of the dehumidifying pipe, the dehumidifying efficiency of the dehumidifying pipe on gas is improved, on the other hand, the contact area of the water absorption sponge and the gas is reduced, the volatile water carried by the gas away from the surface of the water absorption sponge is reduced, the humidity of the gas entering the straight pipe through the dehumidifying pipe is reduced, and the practical application effect of the invention is improved.
Drawings
The invention is further described below with reference to the drawings and the embodiments.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a perspective view of a dehumidifying pipe according to the present invention;
FIG. 3 is a schematic view showing the construction of a dehumidifying pipe according to the present invention;
FIG. 4 is an enlarged view at A in FIG. 3;
in the figure: 1. a sonic nozzle element; 2. a vacuum pump; 3. a gas storage tank; 31. an on-off valve; 4. a collector pipe; 5. a stagnation vessel; 51. a first temperature detector; 52. a first pressure detector; 6. a straight pipe; 61. a measured table; 62. a second temperature detector; 63. a second pressure detector; 7. a dehumidification pipe; 71. a first cavity; 72. a water inlet; 73. a water outlet; 74. a water-absorbing sponge; 75. a helical groove; 751. an elastic plate; 76. an air inlet pipe; 8. a dehumidification plate; 81. a cavity II; 82. a convex strip; 9. an osmotic membrane cartridge; 91. anhydrous copper sulfate crystals.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 4, the negative pressure type gas standard detection device based on the sonic nozzle of the present invention comprises a sonic nozzle element 1, a vacuum pump 2, a gas storage tank 3, a switch valve 31, a collecting pipe 4, a stagnation container 5, a first temperature detector 51, a first pressure detector 52, a straight pipe 6, a controller and a measured meter 61; one end of the straight pipe 6 is communicated with the stagnation container 5, and the outer wall of the straight pipe 6 is provided with a meter 61 to be measured; a second temperature detector 62 and a second pressure detector 63 are arranged on two sides of the measured meter 61; one end of the sonic nozzle element 1 is communicated with one side of the stagnation container 5 far away from the straight pipe 6, and the other end is communicated with the collecting pipe 4; the sonic nozzle element 1 is communicated with the collecting pipe 4 through a switch valve 31; the first temperature detector 51 and the first pressure detector 52 are mounted on the stagnation container 5 and located on both sides of the sonic nozzle element 1; the gas storage tank 3 is communicated with the collecting pipe 4; the vacuum pump 2 is communicated with the air storage tank 3; the controller is used for controlling the gas standard detection device to automatically operate;
one end of the straight pipe 6, which is far away from the measured meter 61, is in threaded connection with a dehumidification pipe 7; a first cavity 71 is formed in the wall of the dehumidification pipe 7; the outer wall of the dehumidification pipe 7 is provided with a water inlet 72 and a water outlet 73; the water inlet 72 and the water outlet 73 are respectively positioned at two ends of the dehumidification pipe 7; the water inlet 72 is positioned below the water outlet 73; the inner wall of the dehumidification pipe 7 is fixedly connected with a water absorption sponge 74;
in the prior art, because the size of air humidity affects the size of air density, air gas constant and critical flow function, the calculation accuracy of the air density, the air gas constant and the critical flow function is reduced; particularly, when the outside is in humid and rainy weather, the difference value is generated in the calculated gas critical flow function due to inaccurate measurement of atmospheric humidity;
when in work, when in wet rainy weather; the staff controls the vacuum pump 2 to evacuate the gas in the gas storage tank 3 through the controller, and then the cooling water is introduced from the water inlet 72; cooling water enters the first cavity 71 and fills the first cavity 71, and the cooling water in the first cavity 71 flows out from the water outlet 73; then the switch valve 31 is opened, and at the moment, the outside air enters the straight pipe 6 through the dehumidification pipe 7 and enters the stagnation container 5 through the straight pipe 6; at this time, the second temperature detector 62, the second pressure detector 63 and the measured meter 61 detect and record the airflow in the straight pipe 6; in the process that the gas enters the dehumidification pipe 7, because the first cavity 71 in the dehumidification pipe 7 is filled with cooling water, the temperature of the inner wall of the dehumidification pipe 7 is reduced, the gas is introduced into the dehumidification pipe 7 and is contacted with the inner wall of the dehumidification pipe 7, so that water vapor carried in the humid gas is condensed into water drops on the inner wall of the dehumidification pipe 7 when being cooled, the water drops on the inner wall of the dehumidification pipe 7 roll along the inner wall of the dehumidification pipe 7 under the blowing of the gas along with the continuous gas entering the dehumidification pipe 7, the water drops are contacted with the water absorption sponge 74 and absorbed by the water absorption sponge 74 until the gas enters the stagnation container 5 and the air pressure in the stagnation container 5 is stable, the numerical values displayed by the first temperature detector 51 and the first pressure detector 52 are observed and recorded, and after the standard detection of the gas is finished, the dehumidification pipe 7 is taken down and the water absorption sponge 74 is dried;
according to the invention, through the arrangement of the dehumidifying pipe 7, water vapor carried by the gas is condensed on the inner wall of the dehumidifying pipe 7, so that the water vapor carried by the gas entering the stagnation container 5 through the dehumidifying pipe 7 is reduced, the humidity of the gas in the stagnation container 5 is reduced, the calculation accuracy reduction of the air density, the air gas constant and the critical flow function caused by the humidity of the gas in the stagnation container 5 is reduced, and the accuracy of gas standard detection is improved.
As an embodiment of the invention, the inner wall of the dehumidification pipe 7 is fixedly connected with a dehumidification plate 8; the shape of the dehumidifying plate 8 is spiral, a second cavity 81 is formed in the dehumidifying plate 8, and the dehumidifying plate 8 inclines towards the inner wall of the dehumidifying pipe 7 along the center of the dehumidifying pipe 7; the second cavity 81 is communicated with the first cavity 71; the water absorption sponge 74 is spirally wound on the edge of the windward side of the dehumidifying plate 8; when the dehumidifying plate works, the cooling water in the first cavity 71 enters the second cavity 81 along with the cooling water entering the first cavity 71 from the water inlet 72, so that the cooling water in the second cavity 81 cools the dehumidifying plate 8; when the gas enters the dehumidifying pipe 7, the gas contacts the surface of the dehumidifying plate 8, so that water vapor carried in the gas is condensed on the surface of the dehumidifying plate 8, the condensed volume of the gas is increased, the condensation amount of the water vapor in the gas on the surface of the dehumidifying plate 8 is increased, the water vapor in the gas is reduced, and the humidity of the gas in the stagnation container 5 is reduced; because the dehumidifying plate 8 inclines towards the inner wall of the dehumidifying pipe 7 along the center of the dehumidifying pipe 7, in the process that gas flows along the dehumidifying plate 8, the gas entering through the center of the dehumidifying pipe 7 flows towards the inner wall of the dehumidifying pipe 7 along the surface of the dehumidifying plate 8, so that the water vapor carried by the gas in the center of the dehumidifying pipe 7 is condensed into water drops on the inner wall of the dehumidifying pipe 7, the water vapor carried by the gas entering the dehumidifying pipe 7 is further reduced, and the dehumidifying plate 8 plays a guiding role for the gas along with the introduction of the gas, so that the water drops condensed on the surface of the dehumidifying plate 8 are blown by the gas to contact with the water absorbing sponge 74 and are absorbed by the water absorbing sponge 74; because the dehumidifying plate 8 is spiral, the gas entering the straight pipe 6 through the dehumidifying plate 8 is mixed more uniformly, so that the difference of the humidity, the temperature and the pressure of the gas at each position in the straight pipe 6 is reduced, and the detection accuracy of the temperature detector 51, the pressure detector 52 and the measured meter 61 at the straight pipe 6 is further ensured; according to the invention, through the arrangement of the dehumidifying plate 8, the water vapor carried by the gas introduced into the dehumidifying pipe 7 can be condensed on the surface of the dehumidifying plate 8, so that the content of the water vapor in the gas is reduced, and the gas in the center of the dehumidifying pipe 7 is contacted with the inner wall of the dehumidifying pipe 7 under the guiding action of the dehumidifying plate 8, so that the water vapor carried by the gas in the center of the dehumidifying pipe 7 is condensed on the inner wall of the dehumidifying pipe 7, thereby reducing the content of the water vapor in the dehumidifying pipe 7 and improving the dehumidifying effect of the dehumidifying pipe 7; further improving the practical application effect of the invention.
As an embodiment of the present invention, the inner wall of the dehumidification plate 8 is provided with a spiral groove 75; the spiral groove 75 is distributed along the edge profile of the dehumidifying plate 8, and an elastic plate 751 is connected in the spiral groove 75 in a sliding manner; the water-absorbing sponge 74 is fixedly connected to the elastic plate 751; when the device works, the elastic plate 751 is arranged to guide the water-absorbing sponge 74 to enter the spiral groove 75; aligning one end of the elastic plate 751 with the spiral groove 75; and pushes the elastic plate 751 to insert into the spiral groove 75, at which time the other end of the elastic plate 751 is exposed out of the spiral groove 75; when the water drops condensed on the surface of the dehumidifying plate 8 flow towards the inner wall of the dehumidifying pipe 7 under the blowing of the gas, the water drops enter the spiral groove 75 to contact with the water absorbing sponge 74 and are absorbed by the water absorbing sponge 74; the water drops condensed on the inner wall of the dehumidifying pipe 7 flow into the spiral groove 75 under the blowing of the gas, so that the water absorbing sponge 74 in the spiral groove 75 absorbs the water drops flowing into the spiral groove 75, when the detection is finished, a worker pulls the other end of the elastic plate 751 to draw the elastic plate 751 out of the spiral groove 75, so that the elastic plate 751 drives the water absorbing sponge 74 to be separated from the spiral groove 75, and the water absorbing sponge 74 is dried; according to the invention, the spiral groove 75 is arranged, so that the spiral groove 75 is matched with the water-absorbing sponge 74, and the water-absorbing sponge 74 can be stored in the spiral groove 75; on one hand, water drops on the surface of the dehumidifying plate 8 and on the inner wall of the dehumidifying pipe 7 are absorbed, the water absorbing sponge 74 is prevented from occupying the inner space of the dehumidifying pipe 7, the dehumidifying efficiency of the dehumidifying pipe 7 on gas is improved, on the other hand, the contact area of the water absorbing sponge 74 and the gas is reduced, the volatile moisture carried by the gas away from the surface of the water absorbing sponge 74 is reduced, the humidity of the gas entering the straight pipe 6 through the dehumidifying pipe 7 is reduced, and the practical application effect of the invention is improved.
As an embodiment of the present invention, an air inlet pipe 76 is fixedly connected to the upper surface of the dehumidification pipe 7; the air inlet pipe 76 is communicated with the interior of the dehumidifying pipe 7, the air inlet pipe 76 is close to the leeward side of the dehumidifying plate 8, the air flow introduced into the air inlet pipe 76 is one cubic meter per hour, and the permeable membrane sleeve 9 is connected in the air inlet pipe 76 in a sliding manner; anhydrous copper sulfate crystals 91 are arranged in the permeable membrane sleeve 9; when the device works, the permeable membrane sleeve 9 is inserted into the air inlet pipe 76, when the switch valve 31 is opened, external air enters the dehumidification pipe 7 through the air inlet pipe 76, the anhydrous copper sulfate crystal 91 inserted into the air inlet pipe 76 absorbs water vapor carried by the air, the humidity of the air entering the air inlet pipe 76 is reduced, and the anhydrous copper sulfate crystal 91 is changed from white to blue-green after absorbing water, so that whether the anhydrous copper sulfate crystal 91 fails can be judged by observing the color of the anhydrous copper sulfate crystal 91, whether the anhydrous copper sulfate crystal 91 needs to be replaced or not is determined, and after the measurement is finished, the flow of the air introduced into the air inlet pipe 76 is subtracted from the reading of the measured meter 61, so that the gas standard quantity needing to be detected is obtained; an opening is formed in the side wall of the dehumidification pipe 7, the air inlet pipe 76 is inserted, and the air inlet pipe 76 is welded with the side wall of the dehumidification pipe 7; the invention ensures that the outside air is dried under the filtration of the anhydrous copper sulfate crystal 91 through the matching of the air inlet pipe 76 and the anhydrous copper sulfate crystal 91, thereby improving the dehumidification effect of the dehumidification pipe 7, and the anhydrous copper sulfate crystal 91 is arranged from the outside of the dehumidification pipe 7, thereby being convenient for observation and replacement and improving the practical application effect of the invention.
As an embodiment of the present invention, the air inlet pipe 76 faces the leeward side of the dehumidification board 8, the shape of the air inlet pipe 76 is set to be a trumpet shape, and the trumpet-shaped air inlet pipe 76 is distributed along the pipe wall of the dehumidification pipe 7; in operation, when external air enters the dehumidification pipe 7 through the air inlet pipe 76, the air inlet pipe 76 is in a horn shape, so that the air inlet amount is unchanged, the cross section of the air inlet pipe 76 is reduced, the flow rate of the air passing through the air inlet pipe 76 is increased, the flow rate of the air in the dehumidification pipe 7 is increased, the impact force of the air is increased, the air can blow water drops condensed on the lee side of the dehumidification plate 8 to move towards the inner wall of the dehumidification pipe 7 along the lee side of the dehumidification plate 8, the water drops move into the spiral groove 75 along the inner wall of the dehumidification pipe 7, the water drops condensed on the lee side of the dehumidification plate 8 are absorbed by the water absorption sponge 74, and the practical application effect of the invention is further improved.
As an embodiment of the present invention, a raised line 82 is fixedly connected to the windward side of the dehumidification plate 8; the convex strip 82 is inclined towards the spiral groove 75; during operation, the gas entering through the gas inlet pipe 76 blows the condensed water mist on the surface of the dehumidifying plate 8 to flow to the windward side of the convex strip 82, so that the water mist is gathered into water droplets, the water droplets move towards the spiral groove 75 along the windward side of the convex strip 82 under the blowing of the gas, the convex strip 82 plays a role in guiding the condensed water on the surface of the dehumidifying plate 8, the absorption of the condensed water on the surface of the dehumidifying plate 8 by the water absorption sponge 74 is facilitated, the volatilization amount of the condensed water is reduced, the gas is reduced to drive the volatilized condensed water to enter the straight pipe 6, the dehumidifying effect of the dehumidifying pipe 7 is kept, and the actual application effect of the dehumidifying device is further improved.
The specific working process is as follows:
when in wet, rainy weather; the staff controls the vacuum pump 2 to evacuate the gas in the gas storage tank 3 through the controller, and then the cooling water is introduced from the water inlet 72; cooling water enters the first cavity 71 and fills the first cavity 71, and the cooling water in the first cavity 71 flows out from the water outlet 73; then the switch valve 31 is opened, and at the moment, the outside air enters the straight pipe 6 through the dehumidification pipe 7 and enters the stagnation container 5 through the straight pipe 6; at this time, the second temperature detector 62, the second pressure detector 63 and the measured meter 61 detect and record the airflow in the straight pipe 6; in the process that the gas enters the dehumidification pipe 7, because the first cavity 71 in the dehumidification pipe 7 is filled with cooling water, the temperature of the inner wall of the dehumidification pipe 7 is reduced, the gas is introduced into the dehumidification pipe 7 and is contacted with the inner wall of the dehumidification pipe 7, so that water vapor carried in the humid gas is condensed into water drops on the inner wall of the dehumidification pipe 7 when being cooled, the water drops on the inner wall of the dehumidification pipe 7 roll along the inner wall of the dehumidification pipe 7 under the blowing of the gas along with the continuous gas entering the dehumidification pipe 7, the water drops are contacted with the water absorption sponge 74 and absorbed by the water absorption sponge 74 until the gas enters the stagnation container 5 and the air pressure in the stagnation container 5 is stable, the numerical values displayed by the first temperature detector 51 and the first pressure detector 52 are observed and recorded, and after the standard detection of the gas is finished, the dehumidification pipe 7 is taken down and the water absorption sponge 74 is dried; as cooling water enters the first cavity 71 from the water inlet 72, the cooling water in the first cavity 71 enters the second cavity 81, so that the cooling water in the second cavity 81 cools the dehumidifying plate 8; when the gas enters the dehumidification pipe 7, the gas is in contact with the surface of the dehumidification plate 8, so that water vapor carried in the gas is condensed on the surface of the dehumidification plate 8, the condensed volume of the gas is increased, the condensation amount of the water vapor in the gas on the surface of the dehumidification plate 8 is increased, the water vapor in the gas is reduced, and the humidity of the gas in the stagnation container 5 is reduced; because the dehumidifying plate 8 inclines towards the inner wall of the dehumidifying pipe 7 along the center of the dehumidifying pipe 7, in the process that gas flows along the dehumidifying plate 8, the gas entering through the center of the dehumidifying pipe 7 flows towards the inner wall of the dehumidifying pipe 7 along the surface of the dehumidifying plate 8, so that the water vapor carried by the gas in the center of the dehumidifying pipe 7 is condensed into water drops on the inner wall of the dehumidifying pipe 7, the water vapor carried by the gas entering the dehumidifying pipe 7 is further reduced, and the dehumidifying plate 8 plays a guiding role for the gas along with the introduction of the gas, so that the water drops condensed on the surface of the dehumidifying plate 8 are blown by the gas to contact with the water absorbing sponge 74 and are absorbed by the water absorbing sponge 74; because the dehumidifying plate 8 is spiral, the gas entering the straight pipe 6 through the dehumidifying plate 8 is mixed more uniformly, so that the difference of the humidity, the temperature and the pressure of the gas at each position in the straight pipe 6 is reduced, and the detection accuracy of the temperature detector 51, the pressure detector 52 and the measured meter 61 at the straight pipe 6 is further ensured; the dehumidification pipe 7 is divided into an inner pipe and an outer pipe; the inner pipe of the dehumidifying pipe 7 and the spiral groove 75 thereof, the dehumidifying plate 8 and the second cavity 81 thereof are formed by lost foam casting, the outer pipe of the dehumidifying pipe 7 is sleeved outside the inner pipe, and two ends of the inner pipe and the outer pipe of the dehumidifying pipe 7 are welded and sealed through metal rings, so that a first cavity 71 is formed between the inner pipe and the outer pipe.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A negative pressure type gas standard detection device based on a sonic nozzle comprises a sonic nozzle element (1), a vacuum pump (2), a gas storage tank (3), a switch valve (31), a collecting pipe (4), a stagnation container (5), a first temperature detector (51), a first pressure detector (52), a straight pipe (6), a controller and a measured meter (61); one end of the straight pipe (6) is communicated with the stagnation container (5), and the outer wall of the straight pipe (6) is provided with a meter to be measured (61); a second temperature detector (62) and a second pressure detector (63) are arranged on two sides of the measured meter (61); one end of the sonic nozzle element (1) is communicated with one side of the stagnation container (5) far away from the straight pipe (6), the other end of the sonic nozzle element is communicated with the collecting pipe (4), and the sonic nozzle element (1) is communicated with the collecting pipe (4) through a switch valve (31); the first temperature detector (51) and the first pressure detector (52) are arranged on the stagnation container (5) and are positioned at two sides of the sonic nozzle element (1); the gas storage tank (3) is communicated with the collecting pipe (4); the vacuum pump (2) is communicated with the air storage tank (3); the controller is used for controlling the gas standard detection device to automatically operate;
the method is characterized in that: one end of the straight pipe (6) far away from the measured meter (61) is connected with a dehumidifying pipe (7) in a threaded manner; a first cavity (71) is formed in the wall of the dehumidification pipe (7), and a water inlet (72) and a water outlet (73) are formed in the outer wall of the dehumidification pipe (7); the water inlet (72) and the water outlet (73) are respectively positioned at two ends of the dehumidification pipe (7), and the water inlet (72) is positioned below the water outlet (73); the inner wall of the dehumidification pipe (7) is fixedly connected with a water absorption sponge (74);
the inner wall of the dehumidification pipe (7) is fixedly connected with a dehumidification plate (8); the dehumidification plate (8) is spiral in shape, a second cavity (81) is formed in the dehumidification plate (8), and the dehumidification plate (8) inclines towards the inner wall of the dehumidification pipe (7) along the center of the dehumidification pipe (7); the second cavity (81) is communicated with the first cavity (71); the water absorption sponge (74) is spirally wound on the edge of the windward side of the dehumidifying plate (8);
the inner wall of the dehumidification pipe (7) is provided with a spiral groove (75); the spiral groove (75) is distributed along the edge profile of the dehumidifying plate (8), and an elastic plate (751) is connected in the spiral groove (75) in a sliding manner; the water absorption sponge (74) is fixedly connected to the elastic plate (751);
the upper surface of the dehumidification pipe (7) is fixedly connected with an air inlet pipe (76); the air inlet pipe (76) is communicated with the interior of the dehumidification pipe (7), the air inlet pipe (76) is close to the leeward side of the dehumidification plate (8), the air flow introduced into the air inlet pipe (76) is one cubic meter per hour, and a permeable membrane sleeve (9) is connected in the air inlet pipe (76) in a sliding manner; anhydrous copper sulfate crystals (91) are arranged in the permeable membrane sleeve (9);
the air inlet pipe (76) faces the leeward side of the dehumidifying plate (8), the air inlet pipe (76) is in a horn shape, and the horn-shaped air inlet pipe (76) is distributed along the outer side and the inner side of the pipe wall of the dehumidifying pipe (7);
the windward side of the dehumidifying plate (8) is fixedly connected with a convex strip (82); the convex strip (82) is inclined towards the spiral groove (75).
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| CN209317401U (en) * | 2018-12-26 | 2019-08-30 | 王磊 | The dehumidification device of electrical equipment |
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| CN101318098B (en) * | 2008-07-15 | 2010-11-17 | 浙江理工大学 | Phase-change adsorption air dehumidifier |
| CN101419088B (en) * | 2008-11-28 | 2010-06-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Calibration device for sonic nozzle gas flowmeter by positive-pressure method and application method |
| CN206788171U (en) * | 2017-05-28 | 2017-12-22 | 临朐玉龙造纸有限公司 | A kind of Substance moisture detector supplies dehydrating unit |
| CN211837150U (en) * | 2020-02-27 | 2020-11-03 | 上海遇吉环保科技有限公司 | Organic waste gas light oxygen catalysis's dehydrating unit |
| CN210862863U (en) * | 2020-03-25 | 2020-06-26 | 南京亿准纳自动化控制技术有限公司 | Gas flowmeter calibrating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209317401U (en) * | 2018-12-26 | 2019-08-30 | 王磊 | The dehumidification device of electrical equipment |
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| Title |
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| 李德文 ; 焦敏 ; 郑磊 ; .燃煤电厂超低排放颗粒物在线监测烟气除湿技术.中国电力.2019,(12),全文. * |
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