CN113154167A - Closed air chamber, air pressure adjusting system and air pressure adjusting method thereof - Google Patents
Closed air chamber, air pressure adjusting system and air pressure adjusting method thereof Download PDFInfo
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- CN113154167A CN113154167A CN202110522545.9A CN202110522545A CN113154167A CN 113154167 A CN113154167 A CN 113154167A CN 202110522545 A CN202110522545 A CN 202110522545A CN 113154167 A CN113154167 A CN 113154167A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 44
- 239000010935 stainless steel Substances 0.000 claims abstract description 44
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 39
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 210000003437 trachea Anatomy 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 239000004945 silicone rubber Substances 0.000 claims 1
- 238000013467 fragmentation Methods 0.000 abstract description 3
- 238000006062 fragmentation reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 109
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 231100000331 toxic Toxicity 0.000 description 6
- 230000002588 toxic effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
- F16L23/22—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of a material other than metal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0271—Housings; Attachments or accessories for photometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
Abstract
The application provides a closed air chamber, an air pressure adjusting system and an air pressure adjusting method thereof, wherein the closed air chamber comprises a stainless steel air chamber, and flanges are fixedly connected to two ends of the stainless steel air chamber respectively; the upper cover of the flange is provided with a fixing piece; a first air pipe and a second air pipe are welded on the side wall of the stainless steel air chamber; by adopting the device, the stainless steel air chamber with the cylindrical structure improves the integral anti-fragmentation capability of the air chamber; the first air pipe and the second air pipe are welded with the stainless steel air chamber, so that the connection stability of the first air pipe and the second air pipe with the stainless steel air chamber is enhanced; the mounting is through with screw hole assorted bolt fastening flange to fix first sealing washer, calcium fluoride lens and second sealing washer in the space that first circular recess and the circular recess of second formed, and then seal stainless steel air chamber both ends, improve the holistic leakproofness of air chamber. The inner part of the closed air chamber is in low air pressure or even in a vacuum state, so that the closed air chamber and the calcium fluoride lens are prevented from being cracked due to the acting force generated by the clamp.
Description
Technical Field
The application relates to the technical field of experimental equipment, in particular to a closed air chamber and an air pressure adjusting system and an air pressure adjusting method thereof.
Background
Most of gases which are toxic and harmful to human bodies have strong absorption peaks in the mid-infrared band, and the width of the absorption peak of the gas is in direct proportion to the pressure of the gas. Therefore, the concentration of toxic and harmful gases in the closed environment can be detected by using the near-infrared laser.
The accuracy of detecting the concentration of the toxic and harmful gases is affected by the output frequency, the line width, the wavelength and other properties of the near-infrared laser. Therefore, the performance of the near-infrared laser needs to be tested to meet the accuracy of detecting the concentration of the toxic and harmful gas. At present, the method for testing the performance of the near-infrared laser is to input toxic and harmful gas into a closed gas chamber with a cylindrical structure made of glass. The outer wall of the closed air chamber is provided with two air holes, one of the air holes is hermetically connected with the air generating device through a rubber tube, and the other air hole is hermetically connected with the air pump through a rubber tube. The two ends of the closed air chamber are respectively connected with a piece of calcium fluoride lens through plastic sleeves, and the parts of the plastic sleeves, which are in contact with the closed air chamber and the calcium fluoride lens, are fastened by clamps so as to ensure the tightness of the closed air chamber. After the gas is input, the interior of the closed gas chamber needs to be in a stable low-pressure environment. And the near-infrared laser generated by the near-infrared laser penetrates through one calcium fluoride lens, penetrates through the inside of the closed air chamber and the other calcium fluoride lens along the axis of the closed air chamber, and is driven into a photoelectric probe positioned at the other calcium fluoride lens, the photoelectric probe is connected with an oscilloscope, and the intensity of the near-infrared laser is monitored through the waveform on the oscilloscope.
However, the clamp and the plastic sleeve need to be in close contact with the air chamber and the calcium fluoride lens under low pressure or even vacuum inside the air chamber, and the force generated by the clamp easily causes the breakage of the air chamber and the calcium fluoride lens.
Disclosure of Invention
The application provides a closed air chamber and air pressure adjusting system, air pressure adjusting method thereof, can be used to solve the problem that the effort that the clamp produced among the prior art leads to closed air chamber and calcium fluoride lens to take place cracked easily.
In a first aspect, the application provides a closed gas chamber, which comprises a stainless steel gas chamber with a cylindrical structure, wherein two ends of the stainless steel gas chamber are respectively and fixedly connected with a flange; the upper cover of the flange is provided with a fixing piece;
a first air pipe and a second air pipe which are communicated with the stainless steel air chamber are welded on the side wall of the stainless steel air chamber;
a first circular groove is formed in the side face, perpendicular to the axis of the flange, and threaded holes are uniformly formed along the outer side of the first circular groove; a first sealing ring and a calcium fluoride lens which are matched with the first circular groove are sequentially arranged in the first circular groove;
a second circular groove is formed in the side face, perpendicular to the axis of the flange, of the fixing piece, and a screw hole corresponding to the threaded hole is formed in the fixing piece; a second sealing ring matched with the second circular groove is arranged in the second circular groove; the fixing piece is fixedly connected with the flange through bolts matched with the threaded holes.
Optionally, the first air pipe and the second air pipe are both KF flange pipes.
Optionally, the side wall of the stainless steel air chamber is provided with a plurality of support holes.
Optionally, a support column is inserted into the support hole.
Optionally, the first sealing ring and the second sealing ring are made of nitrile rubber or silica gel.
In a second aspect, the present application provides a closed cell air pressure regulation system comprising a closed cell of the first aspect; the gas pump is connected with the first gas tank through the first gas pipe, the first gas tank is connected with the second gas tank through the second gas pipe, and the second gas tank is connected with the third gas tank through the third gas pipe; the second trachea is connected with the second gas jar, be provided with the third valve between second trachea and the second gas jar.
In a third aspect, the present application provides a closed air chamber air pressure regulating method, which is applied to the closed air chamber air pressure regulating system of the second aspect;
the air pressure adjusting method comprises the following steps:
closing the second valve and the third valve, and opening the first valve;
starting an air pump to vacuumize the closed air chamber;
closing the first valve, opening the third valve, and inflating the closed air chamber until the air pressure is stable;
closing the third valve and opening the first valve;
and starting the air pump to pump the closed air chamber to the target air pressure.
Optionally, the air pressure adjusting method may further include:
closing the second valve and the third valve, and opening the first valve;
starting the air pump to vacuumize the closed air chamber;
closing the first valve, opening the second valve, and inflating the closed air chamber until the air pressure is stable;
closing the second valve and opening the first valve;
and starting the air pump to pump the closed air chamber to the target air pressure.
Optionally, the gas in the first gas tank and the gas in the second gas tank are the same, and the concentration of the gas in the first gas tank and the concentration of the gas in the second gas tank are different.
Optionally, the gas in the first gas tank and the gas in the second gas tank are different, and the concentration of the gas in the first gas tank and the concentration of the gas in the second gas tank are different.
The application provides a closed air chamber, an air pressure adjusting system and an air pressure adjusting method thereof, wherein the closed air chamber comprises a stainless steel air chamber with a cylindrical structure, and two ends of the stainless steel air chamber are respectively and fixedly connected with a flange; the upper cover of the flange is provided with a fixing piece; a first air pipe and a second air pipe which are communicated with the stainless steel air chamber are welded on the side wall of the stainless steel air chamber; a first circular groove is formed in the side face, perpendicular to the axis of the flange, and threaded holes are uniformly formed along the outer side of the first circular groove; a first sealing ring and a calcium fluoride lens which are matched with the first circular groove are sequentially arranged in the first circular groove; a second circular groove is formed in the side face, perpendicular to the axis of the flange, of the fixing piece, and a screw hole corresponding to the threaded hole is formed in the fixing piece; a second sealing ring matched with the second circular groove is arranged in the second circular groove; the fixing piece is fixedly connected with the flange through bolts matched with the threaded holes.
By adopting the device, the stainless steel air chamber with the cylindrical structure improves the integral anti-fragmentation capability of the air chamber; the first air pipe and the second air pipe are welded with the stainless steel air chamber, so that the connection stability of the first air pipe and the second air pipe with the stainless steel air chamber is enhanced; the mounting is through with screw hole assorted bolt fastening flange to fix first sealing washer, calcium fluoride lens and second sealing washer in the space that first circular recess and the circular recess of second formed, and then seal the both ends of stainless steel air chamber, improve the holistic leakproofness of air chamber. The inner part of the closed air chamber is in low air pressure or even in a vacuum state, so that the closed air chamber and the calcium fluoride lens are prevented from being cracked due to the acting force generated by the clamp.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a closed air chamber provided in the examples section of the present application;
FIG. 2 is a schematic structural diagram of a fixture in a closed air chamber according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a stainless steel chamber in a closed gas chamber according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a closed cell pressure regulation system according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart of a method for adjusting the pressure of a closed air chamber according to an embodiment of the present disclosure;
fig. 6 is another schematic flow chart of a method for adjusting the pressure of a closed air chamber according to the embodiments of the present disclosure.
Wherein, 1-stainless steel air chamber, 11-first air pipe, 12-second air pipe, 13-supporting hole, 14-supporting column; 2-flange, 21-first circular groove, 22-threaded hole, 23-first sealing ring, 24-calcium fluoride lens; 3-a fixing piece, 31-a second circular groove, 32-a screw hole, 33-a second sealing ring and 34-a bolt; 4-a three-way flange pipe; 5-air pump, 51-first valve; 6-a first gas tank, 61-a second valve; 7-second gas tank, 71-third valve.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As described in the background of the present application, the current method for testing the performance of a near-infrared laser is to introduce toxic and harmful gases into a sealed gas chamber of a cylindrical structure made of glass. The outer wall of the closed air chamber is provided with two air holes, one of the air holes is hermetically connected with the air generating device through a rubber tube, and the other air hole is hermetically connected with the air pump through a rubber tube. The two ends of the closed air chamber are respectively connected with a piece of calcium fluoride lens through plastic sleeves, and the parts of the plastic sleeves, which are in contact with the closed air chamber and the calcium fluoride lens, are fastened by clamps so as to ensure the tightness of the closed air chamber. After the gas is input, the interior of the closed gas chamber needs to be in a stable low-pressure environment. And the near-infrared laser generated by the near-infrared laser penetrates through one calcium fluoride lens, penetrates through the inside of the closed air chamber and the other calcium fluoride lens along the axis of the closed air chamber, and is driven into a photoelectric probe positioned at the other calcium fluoride lens, the photoelectric probe is connected with an oscilloscope, and the intensity of the near-infrared laser is monitored through the waveform on the oscilloscope. However, the clamp and the plastic sleeve need to be in close contact with the air chamber and the calcium fluoride lens under low pressure or even vacuum inside the air chamber, and the force generated by the clamp easily causes the breakage of the air chamber and the calcium fluoride lens.
Therefore, in order to solve the above problems, the present application provides a closed air chamber, referring to fig. 1, where fig. 1 is a schematic structural diagram of the closed air chamber. The closed air chamber comprises a stainless steel air chamber 1 with a cylindrical structure, the stainless steel air chamber 1 can be made of 304 stainless steel materials, deformation and even fragmentation are avoided when ultra-low pressure or even vacuum exists in the stainless steel air chamber 1, and the stability and the safety of the stainless steel air chamber 1 are improved.
Two ends of the stainless steel air chamber 1 are respectively and fixedly connected with a flange 2; the upper cover of the flange 2 is provided with a fixing part 3; optionally, the flange 2 is made of 304 stainless steel and integrally connected with the stainless steel air chamber 1, so that the sealing performance of the connection between the stainless steel air chamber 1 and the flange 2 is improved. Optionally, when ultralow pressure is even the vacuum in stainless steel air chamber 1, the lifting surface area of mounting 3 is less relatively, and mounting 3 chooses for use the aluminium material also can not take place deformation, has reduced the quality of a airtight air chamber that this application provided, and has improved the portability. The materials of the stainless steel gas chamber 1, the flange 2 and the fixing member 3 in the present application may be selected as needed, and are not particularly limited.
The side wall of the stainless steel air chamber 1 is welded with a first air pipe 11 and a second air pipe 12 which are communicated with the stainless steel air chamber 1. Wherein, first trachea 11 and second trachea 12 are KF25 flange pipe, and KF25 flange pipe is common flange pipe, is convenient for obtain.
The flange 2 is provided with a first circular groove 21 on a side surface perpendicular to the axis of the flange 2, and threaded holes 22 are uniformly formed along the outer side of the first circular groove 21.
A first sealing ring 23 and a calcium fluoride lens 24 which are matched with the first circular groove 21 are sequentially arranged in the first circular groove 21; wherein, the first sealing ring 23 is arranged at the bottom of the first circular groove 21, and the calcium fluoride lens 24 is covered on the first sealing ring 23.
Referring to fig. 2, a second circular groove 31 is formed in a side surface of the fixing member 3 perpendicular to the axis of the flange 2, and a screw hole 32 corresponding to the screw hole 22 is formed; a second sealing ring 33 matched with the second circular groove 31 is arranged in the second circular groove 31; the fixing piece 3 is fixedly connected with the flange 2 through bolts 34 matched with the threaded holes 22. The end of the bolt 34 extends through the screw hole 32 to the screw hole 22, and the bolt 34 is tightened to achieve tight connection between the fixing member 3 and the flange 2.
The second sealing ring 33 is pressed on the calcium fluoride lens 24 by the fixing part 3, the fixing part 3 is in direct contact with the calcium fluoride lens 24, the calcium fluoride lens 24 can be crushed by the acting force generated by the fixing part 3, the second sealing ring 33 is positioned between the 3 calcium fluoride lenses 24 of the fixing part, the buffering effect is achieved, the calcium fluoride lens 24 is prevented from being crushed by the fixing part 3, and meanwhile the sealing performance of the closed air chamber provided by the application is further improved.
The first sealing ring 23 and the second sealing ring 33 are both made of nitrile rubber or silica gel. The soft ageing-resistant of butadiene acrylonitrile rubber or silica gel matter, and be convenient for acquire, improved the compactness of first sealing washer 23 and second sealing washer 33 and calcium fluoride lens 24 contact, improve the practicality of an airtight air chamber that this application provided simultaneously.
Referring to fig. 3, a plurality of support holes 13 are formed in the side wall of the stainless steel air chamber 1; a support column 14 is inserted into the support hole 13. The support holes 13 do not penetrate through the side wall of the stainless steel air chamber 1; the tip of support column 14 inserts in supporting hole 13, and the other end is pegged graft on the fixed station, plays the fixed action to the airtight air chamber that this application provided.
The application provides a closed air chamber which comprises a stainless steel air chamber 1 with a cylindrical structure, wherein two ends of the stainless steel air chamber 1 are respectively and fixedly connected with a flange 2; the upper cover of the flange 2 is provided with a fixing part 3; a first air pipe 11 and a second air pipe 12 which are communicated with the stainless steel air chamber 1 are welded on the side wall of the stainless steel air chamber 1; a first circular groove 21 is formed in the side surface, perpendicular to the axis of the flange 2, and threaded holes 22 are uniformly formed along the outer side of the first circular groove 21; a first sealing ring 23 and a calcium fluoride lens 24 which are matched with the first circular groove 21 are sequentially arranged in the first circular groove 21; a second circular groove 31 is formed in the side surface of the fixing piece 3 perpendicular to the axis of the flange 2, and a screw hole 32 corresponding to the screw hole 22 is formed; a second sealing ring 33 matched with the second circular groove 31 is arranged in the second circular groove 31; the fixing piece 3 is fixedly connected with the flange 2 through bolts 34 matched with the threaded holes 22. By adopting the device, the fracture of the closed air chamber and the calcium fluoride lens 24 caused by the acting force generated by the clamp is avoided under the condition of low air pressure or even vacuum inside the closed air chamber.
Based on the above disclosed airtight chamber, the embodiment of the present application also provides an airtight chamber air pressure adjusting system, refer to fig. 4, and fig. 4 is a schematic structural diagram of the airtight chamber air pressure adjusting system.
The closed air chamber air pressure adjusting system comprises the closed air chamber disclosed above; the first air pipe 11 is connected with a three-way flange pipe 4, the three-way flange pipe 4 is respectively connected with an air pump 5 and a first air tank 6, a first valve 51 is arranged between the air pump 5 and the three-way flange pipe 4, and a second valve 61 is arranged between the first air tank 6 and the three-way flange pipe 4; the second gas pipe 12 is connected with the second gas tank 7, and a third valve 71 is arranged between the second gas pipe 12 and the second gas tank 7. Wherein, the first air pipe 11 is fixedly connected with the three-way flange pipe 4 through a KF vacuum flange hoop; the air pump 5 and the first gas tank 6 are both fixedly connected with the three-way flange pipe 4 through KF vacuum flange hoops; similarly, the second gas pipe 12 is fixedly connected to the second gas tank 7 by a KF vacuum flange clamp. KF vacuum flange clamp clamping strength is high, but the quick clamping or loosen, each mouth of pipe quick butt joint and separation of the above-mentioned device of being convenient for.
Based on the above disclosed closed air chamber air pressure adjusting system, the embodiment of the present application further provides a closed air chamber air pressure adjusting method, which is applied to the above disclosed closed air chamber air pressure adjusting system; referring to fig. 5, the air pressure adjusting method includes:
in step S11, the second valve 61 and the third valve 71 are closed, and the first valve 51 is opened.
In step S12, the air pump 5 is turned on to evacuate the closed air chamber.
In step S13, the first valve 51 is closed, the third valve 71 is opened, and the closed air chamber is inflated until the air pressure is stabilized.
In step S14, the third valve 71 is closed and the first valve 51 is opened.
In step S15, the air pump 5 is turned on to pump the closed air chamber to the target air pressure.
In steps S11-S15, a vacuum gauge is also installed to detect the air pressure in the sealed air chamber, and the target air pressure is observed by the vacuum gauge. In the scheme, the second gas tank 7 can inflate the closed gas chamber and the air pump 5 can exhaust the gas at the same time, and the target gas pressure of the closed gas chamber is dynamically balanced; or the second gas tank 7 can firstly charge gas into the closed gas chamber until the gas pressures in the second gas tank 7 and the closed gas chamber are the same, then the third valve 71 is closed, the first valve 51 is opened, the gas pump 5 is started to pump the closed gas chamber to the target gas pressure, and at the moment, the closed gas chamber is not charged with gas any more and is not pumped out of the closed gas chamber; and finally, penetrating the near-infrared laser generated by the near-infrared laser through one calcium fluoride lens 24, penetrating the inside of the closed air chamber and the other calcium fluoride lens 24 along the axis of the closed air chamber, and driving a photoelectric probe positioned at the other calcium fluoride lens 24 into the closed air chamber, wherein the photoelectric probe is connected with an oscilloscope, and the intensity of the near-infrared laser is monitored through the waveform on the oscilloscope.
Referring to fig. 6, the air pressure adjusting method may further include:
in step S16, the second valve 61 and the third valve 71 are closed, and the first valve 51 is opened.
And step S17, turning on the air pump 5 to vacuumize the closed air chamber.
Step S18 is to close the first valve 51, open the second valve 61, and inflate the closed air chamber until the air pressure is stabilized.
In step S19, the second valve 61 is closed and the first valve 51 is opened.
In step S20, the air pump 5 is turned on to pump the closed air chamber to the target air pressure.
In steps S16-S20, it is also necessary to install a vacuum gauge to detect the air pressure in the closed air chamber, and the target air pressure is observed by the vacuum gauge. According to the scheme, the first gas tank 6 can inflate the closed gas chamber and the air pump 5 can exhaust the gas at the same time, and the target gas pressure of the closed gas chamber is dynamically balanced; or the first gas tank 6 can firstly charge gas into the closed gas chamber until the gas pressures in the first gas tank 6 and the closed gas chamber are the same, then the second valve 61 is closed, the first valve 51 is opened, the gas pump 5 is started to pump the closed gas chamber to the target gas pressure, and at the moment, the gas is not charged into the closed gas chamber, and the gas is not pumped out of the closed gas chamber; and finally, penetrating the near-infrared laser generated by the near-infrared laser through one calcium fluoride lens 24, penetrating the inside of the closed air chamber and the other calcium fluoride lens 24 along the axis of the closed air chamber, and driving a photoelectric probe positioned at the other calcium fluoride lens 24 into the closed air chamber, wherein the photoelectric probe is connected with an oscilloscope, and the intensity of the near-infrared laser is monitored through the waveform on the oscilloscope.
The gas in the first gas tank 6 and the gas in the second gas tank 7 are the same, and the concentration is different.
The measured gas absorption lines will also be different for corresponding gases of different concentrations; the first gas tank 6 may be 99% methane in concentration and the second gas tank 7 may be 80% methane in concentration. Therefore, the gas absorption spectral lines of two kinds of gases with different concentrations under different air pressures can be measured on the premise of not replacing the gas tank.
The first gas tank 6 and the second gas tank 7 have different gases and different concentrations.
The first gas tank 6 may be 99% methane in concentration and the second gas tank 7 may be 80% methane in concentration and 20% nitrogen in concentration. Therefore, the gas absorption spectral lines of two kinds of gases with different concentrations under different air pressures can be measured on the premise of not replacing the gas tank.
In the embodiment of the present application, the embodiment of the closed air chamber air pressure adjusting system portion and the embodiment of the closed air chamber air pressure adjusting method portion may be referred to each other, and are not described herein again.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. The closed air chamber is characterized by comprising a stainless steel air chamber (1) with a cylindrical structure, wherein two ends of the stainless steel air chamber (1) are respectively and fixedly connected with a flange (2); the upper cover of the flange (2) is provided with a fixing piece (3);
a first air pipe (11) and a second air pipe (12) which are communicated with the stainless steel air chamber (1) are welded on the side wall of the stainless steel air chamber (1);
a first circular groove (21) is formed in the side face, perpendicular to the axis of the flange (2), and threaded holes (22) are uniformly formed along the outer side of the first circular groove (21); a first sealing ring (23) and a calcium fluoride lens (24) which are matched with the first circular groove (21) are sequentially arranged in the first circular groove (21);
a second circular groove (31) is formed in the side face, perpendicular to the axis of the flange (2), of the fixing piece (3), and a screw hole (32) corresponding to the threaded hole (22) is formed in the side face; a second sealing ring (33) matched with the second circular groove (31) is arranged in the second circular groove (31); the fixing piece (3) is fixedly connected with the flange (2) through a bolt (34) matched with the threaded hole (22).
2. A containment plenum according to claim 1, wherein said first and second gas tubes (11, 12) are KF25 flanged tubes.
3. A closed air chamber according to claim 1, characterized in that the side wall of the stainless steel air chamber (1) is provided with a plurality of supporting holes (13).
4. A closed gas cell according to claim 3, characterized in that support posts (14) are inserted in said support holes (13).
5. A closed gas cell according to claim 1, wherein said first and second sealing rings (23, 33) are made of nitrile rubber or silicone rubber.
6. A closed cell air pressure regulation system, comprising a closed cell according to any one of claims 1 to 5; the gas pump is connected with the first gas tank through the first gas pipe, the first gas tank is connected with the second gas tank through the second gas pipe, and the second gas tank is connected with the third gas tank through the third gas pipe; the second trachea is connected with the second gas jar, be provided with the third valve between second trachea and the second gas jar.
7. A closed-cell air pressure adjusting method, characterized in that the air pressure adjusting method is applied to a closed-cell air pressure adjusting system according to claim 6;
the air pressure adjusting method comprises the following steps:
closing the second valve and the third valve, and opening the first valve;
starting an air pump to vacuumize the closed air chamber;
closing the first valve, opening the third valve, and inflating the closed air chamber until the air pressure is stable;
closing the third valve and opening the first valve;
and starting the air pump to pump the closed air chamber to the target air pressure.
8. The closed gas chamber air pressure adjusting method according to claim 7, further comprising:
closing the second valve and the third valve, and opening the first valve;
starting the air pump to vacuumize the closed air chamber;
closing the first valve, opening the second valve, and inflating the closed air chamber until the air pressure is stable;
closing the second valve and opening the first valve;
and starting the air pump to pump the closed air chamber to the target air pressure.
9. A method of regulating a gas pressure in a closed gas cell as claimed in claim 8, wherein the gas in said first gas tank and said second gas tank are the same and have different concentrations.
10. A method for regulating a gas pressure in a closed gas cell as claimed in claim 8, wherein said first gas tank and said second gas tank are different in gas concentration.
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