CN109488875B - Liquid nitrogen automatic filling system of FTIR online monitoring instrument and control method thereof - Google Patents
Liquid nitrogen automatic filling system of FTIR online monitoring instrument and control method thereof Download PDFInfo
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- CN109488875B CN109488875B CN201811331498.4A CN201811331498A CN109488875B CN 109488875 B CN109488875 B CN 109488875B CN 201811331498 A CN201811331498 A CN 201811331498A CN 109488875 B CN109488875 B CN 109488875B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 226
- 239000007788 liquid Substances 0.000 title claims abstract description 113
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 112
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005485 electric heating Methods 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims description 51
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 208000020673 hypertrichosis-acromegaloid facial appearance syndrome Diseases 0.000 claims 3
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000003325 tomography Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 230000003028 elevating effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001506 fluorescence spectroscopy Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
Abstract
The invention belongs to maintenance equipment of an optical instrument, and particularly relates to an automatic liquid nitrogen filling system of an FTIR (infrared fluorescence tomography) online monitoring instrument and a control method thereof, wherein the automatic liquid nitrogen filling system comprises a liquid nitrogen storage tank and a filling pipe, one end of the filling pipe is inserted into the liquid nitrogen storage tank from the bottle opening of the liquid nitrogen storage tank, and the other end of the filling pipe is communicated with the inner cavity of a Dewar flask of the FTIR online monitoring instrument; an electric heating device is further arranged in the liquid nitrogen storage tank, a pressure release valve is arranged on the filling pipe, and the starting and stopping of the filling system are jointly controlled by the pressure release valve and the electric heating device. According to the invention, the pump head of the liquid nitrogen automatic filling system of the FTIR online monitoring instrument is integrally designed, optimized and improved, high-pressure nitrogen is forced to be introduced into the FTIR online monitoring instrument through the closing of the pressure release valve, the filling system is decompressed through the opening of the pressure release valve, so that the filling is stopped, the pressurization is carried out by assisting the heating device, the timed and quantitative filling of the liquid nitrogen is simply and efficiently realized, the system stability is good, and the working precision is high.
Description
Technical Field
The invention belongs to maintenance equipment of an optical instrument, and particularly relates to an automatic liquid nitrogen filling system of an FTIR (Fourier transform infrared spectroscopy) online monitoring instrument and a control method thereof.
Background
An FTIR (infrared fluorescence spectroscopy) online monitoring instrument is an air detection device for detecting atmospheric components by utilizing infrared absorption spectrum, is the leading technology in the field of air detection, and develops rapidly in recent years. And the spectrum of FTIR on-line monitoring instrument is gathered and is required infrared signal emission unit and receiving element collaborative work, and infrared signal detection unit wherein is higher to the sensitivity of temperature, need keep realizing high accuracy under microthermal operational environment and survey, because FTIR on-line monitoring instrument needs continuously cool down to infrared signal detection unit.
The liquid nitrogen temperature can reach-196 ℃, and in the FTIR instrument, the infrared signal detection unit is mainly refrigerated, and the thermal noise of the detection unit can be reduced by refrigeration. And the Dewar flask of FTIR instrument adds a liquid nitrogen and uses 24h at most, need the guard to maintain to the on-line monitoring instrument, regularly supplements the liquid nitrogen in the Dewar flask, so not only extravagant manual work, is difficult to guarantee the continuous supply of liquid nitrogen moreover to influence the detection precision of instrument.
Disclosure of Invention
The invention aims to provide a simple and efficient liquid nitrogen automatic filling system for an FTIR online monitoring instrument and a filling method thereof.
In order to achieve the purpose, the invention provides the following technical scheme: an automatic liquid nitrogen filling system of an FTIR online monitoring instrument comprises a liquid nitrogen storage tank and a filling pipe, wherein one end of the filling pipe is inserted into the liquid nitrogen storage tank from the bottle opening of the liquid nitrogen storage tank and extends to the bottom of the liquid nitrogen storage tank, and the other end of the filling pipe is communicated with the inner cavity of a Dewar flask of the FTIR online monitoring instrument; the filling pipe is hermetically connected with the opening of the liquid nitrogen storage tank; still be equipped with electric heater unit in the liquid nitrogen storage tank, be equipped with the relief valve on the filler pipe, start-stop of filling system is by relief valve and electric heater unit joint control, and when electric heater unit started and the relief valve closed, the filling system was in the filling state, and in the liquid nitrogen gasification back directly got into the dewar bottle this moment, when electric heater unit closed and the relief valve started, the filling system was in and stopped the filling state, and the gasified nitrogen gas in the liquid nitrogen storage tank directly discharged to the atmosphere through the relief valve.
The pressure relief valve is an electromagnetic pressure relief valve, the start and stop of the electric heating device and the pressure relief valve are controlled by an automatic controller, the automatic controller comprises a timer, and the automatic controller automatically controls the start and stop states of the electric heating device and the pressure relief valve according to a set time period.
The system also comprises a liquid level meter and a pressure sensor, wherein the liquid level meter is inserted into the liquid nitrogen storage tank from the bottle opening of the liquid nitrogen storage tank and extends to the bottle bottom of the liquid nitrogen storage tank, and the pressure sensor is communicated with the bottle opening of the liquid nitrogen storage tank in a sealing way through a hose; and the filling pipe is also provided with a safety valve.
Still be equipped with temperature sensor in the Dewar flask of FTIR on-line monitoring instrument, temperature sensor's signal output part is connected with the automatic control electricity, the automatic control opens according to opening of signal control relief valve and electric heater unit that temperature sensor gathered.
The liquid nitrogen storage tank's bottleneck department is equipped with the pump head base, set up exhaust passage in the pump head base, the filling pipe establishes ties with this exhaust passage, relief valve and electric heater unit's lead wire are installed on the pump head base, last pressure sensor of installing of pump head base and/or the relief valve.
The pressure relief valve comprises a conical valve core, a pressure relief hole communicated with an official cavity of the filling pipe is formed in the base of the pump head, the conical valve core reciprocates along the vertical direction and forms opening and closing actions with the pressure relief hole, the upper end of the conical valve core is fixedly connected with the relay iron core, a reset spring is sleeved on the conical valve core, and the lower end of the reset spring is abutted to an orifice of the pressure relief hole.
Still be equipped with the protection shroud on the pump head base, each sensor lead wire and control circuit board integration are inside the protection shroud, the pressure release hole also is located inside the protection shroud, the protection shroud top is equipped with the exhaust hole.
The bottom of the pump head base is provided with a connecting flange, the connecting flange is in butt joint with a flange at the bottle mouth of the liquid nitrogen storage tank, a sealing ring is arranged between the end faces of the two flanges, and the peripheries of the two flanges are clamped through a half type clamp; the two half bodies of the half hoop reciprocate in the horizontal direction, a locking mechanism is arranged on the top wall of the half hoop, and the locking mechanism is assembled to be capable of applying pressing force to the top surface of the flange of the pump head base when the locking mechanism is locked.
The system also comprises a lifting mechanism for driving the pump head base to reciprocate along the vertical direction; elevating system includes the lift slip table, the pump head base is connected with the lift slip table, be equipped with first linkage between lift slip table and the half formula clamp, first linkage is assembled for two halfbodies block that first linkage can drive half formula clamp when the lift slip table is down, and first linkage can drive two halfbodies separation of half formula clamp when the lift slip table goes upward.
First link gear is including the horizontal guide arm that half body outside of ha fu formula clamp set up, the guide pin bushing sliding connection that sets up on guide arm and the frame, the one end that ha fu formula clamp was kept away from to the guide arm is equipped with the gyro wheel, be equipped with the spring between guide arm and the guide pin bushing, the spring is assembled for its elasticity can order about half body of ha fu formula clamp to the direction motion of keeping away from each other, the bottom of lift slip table with gyro wheel correspondence position department is equipped with the wedge drive block, the wedge drive block is assembled when lift slip table is down, and the wedge drive block can extrude the gyro wheel and drive two half bodies of ha fu formula clamp are close to each other.
Locking mechanism includes the cam with the roof articulated of ha fu formula clamp, the top surface butt of the wheel face of cam and the flange on the pump head base, be fixed with a pendulum rod on the cam, the pendulum rod sets up to the outside overhang of ha fu formula clamp, thereby the pendulum rod is assembled with the cam and can extrudees the flange top surface of pump head base downwards for the bulge of cam when the pendulum rod pushes down, and just the minimum is just swung to the bulge of cam when the pendulum rod pushes down and contradicts with the top surface of ha fu formula clamp makes cam and pendulum rod auto-lock.
And a second linkage mechanism is arranged between the locking mechanism and the lifting sliding table, and is assembled to drive the swing rod to press downwards when the lifting sliding table goes downwards, and drive the swing rod to lift upwards when the lifting sliding table goes upwards.
Be equipped with the round hole that is used for dodging the pump head base on the lift slip table, second linkage includes that the round hole inner wall goes up to round hole center overhang setting go up the shifting block and lower shifting block, it is used for stirring pendulum rod lower hem to go up the shifting block, lower shifting block is used for stirring and lifts on the pendulum rod, the overhang length of going up the shifting block is greater than the overhang length of shifting block down, and the overhang length of shifting block down is set up to down the shifting block can dodge completely and be in the pendulum rod of lifting up the station on when the lift slip table is down, and down the shifting block can with be in the overhang end butt of the pendulum rod of pushing down the station when the lift slip table is up.
Horizontal guide pins are symmetrically arranged on two sides of the pump head base, a limiting plate is arranged on the top surface of the lifting sliding table, and vertical waist-shaped holes in sliding fit with the guide pins are formed in the limiting plate.
The two ends of the lifting sliding table are respectively provided with a vertical threaded hole, the lifting sliding table and the two screws form threaded fit through the threaded holes, the two ends of the screws are respectively rotatably arranged on the base, the top of the base is provided with a lifting motor, and the lifting motor and the two screws form transmission fit through a synchronous belt pulley.
The system also comprises a liquid nitrogen storage tank loading and unloading mechanism, wherein the liquid nitrogen storage tank loading and unloading mechanism comprises a base consisting of a plurality of roller columns which are arranged in parallel in a rotating manner, one end of the base is provided with a slope slideway, the upper part of the base is provided with a liquid nitrogen storage tank positioning mechanism, the liquid nitrogen storage tank positioning mechanism comprises an arc-shaped back plate arranged on one side far away from the slope slideway and two elastic compression rollers symmetrically arranged on one side close to the slope slideway, a space for containing the liquid nitrogen storage tank is formed between the two elastic compression rollers and the arc-shaped back plate, the two elastic compression rollers are mutually opened and closed along the left and right direction, horizontal guide rods are arranged on roller seats of the two elastic compression rollers, the guide rods are in sliding fit with the; the arc-shaped back plate is arranged in a reciprocating mode in the front-back direction, and a piston cylinder used for driving the arc-shaped back plate to reciprocate is arranged on the machine base.
The invention also provides a control method of the liquid nitrogen automatic filling system for the FTIR online monitoring instrument, which comprises the following steps:
the method comprises the following steps: and circularly opening and closing the electric heating device and the pressure release valve according to a set time period, synchronously closing the pressure release valve when the electric heating device is opened, synchronously opening the pressure release valve when the electric heating device is closed, and opening the electric heating device for 3-10min every time every 8-12 h.
The second is as follows: according to the collection signal control electric heater unit that sets up of liquid nitrogen storage tank and the opening of relief valve, specifically do: when the temperature is higher than-180 ℃, the electric heating device is opened and the pressure relief valve is closed, when the temperature is lower than-193 ℃, the temperature is continuously kept for 80s, namely the liquid nitrogen adding is considered to be finished, and at the moment, the electric heating device is closed and the pressure relief valve is opened.
The invention has the technical effects that: the invention carries out integrated design and optimized improvement on the pump head of the liquid nitrogen automatic filling system for the FTIR online monitoring instrument, forces high-pressure nitrogen to enter the optical instrument through the closing of the pressure release valve, and leads the filling system to lose pressure through the opening of the pressure release valve, thereby stopping filling, and is assisted with a heating device for pressurization, thereby simply and efficiently realizing the timing and quantitative filling of the liquid nitrogen, and having good system stability and high working precision.
Drawings
FIG. 1 is a schematic perspective view of a liquid nitrogen filling system according to an embodiment of the present invention;
FIG. 2 is an exploded view of a liquid nitrogen filling system provided by an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a liquid nitrogen fill system provided by an embodiment of the present invention;
FIG. 4 is a schematic view of a portion of a pump head according to an embodiment of the present invention;
FIG. 5 is a schematic perspective view of a pump head provided in an embodiment of the present invention;
FIG. 6 is a front view of a liquid nitrogen storage tank handling mechanism provided by an embodiment of the present invention;
FIG. 7 is a perspective view of a liquid nitrogen storage tank attachment/detachment mechanism provided in an embodiment of the present invention;
FIG. 8 is a sectional view of a liquid nitrogen storage tank loading and unloading mechanism and a partially enlarged view of a second linkage mechanism in different station states, according to an embodiment of the present invention;
fig. 9 is a schematic perspective view of an elevating slide table according to an embodiment of the present invention;
FIG. 10 is a perspective view of a first linkage provided by an embodiment of the present invention;
FIG. 11 is a perspective view of a liquid nitrogen storage tank positioning mechanism provided by an embodiment of the present invention.
Detailed Description
In the following, the detailed description of the embodiments of the present invention is provided with reference to fig. 1 to 11, and it should be particularly noted that the expressions of directions indicated as "left and right", "front and back" and the like in the present invention are based on the actual installation state of the equipment, for example, in fig. 11, the side where the slope slideway is located is the front, and the side where the arc-shaped backboard is located is the back.
As shown in fig. 1, 2 and 3, an automatic liquid nitrogen filling system for an FTIR online monitoring instrument comprises a liquid nitrogen storage tank 10 and a filling pipe 21, wherein one end of the filling pipe 21 is inserted into the liquid nitrogen storage tank 10 from a bottle opening of the liquid nitrogen storage tank 10 and extends to the bottom of the liquid nitrogen storage tank 10, the other end of the filling pipe is communicated with an inner cavity of a dewar of the FTIR online monitoring instrument, and a necessary one-way valve is arranged on a pipeline; the filling pipe 21 is connected with the opening of the liquid nitrogen storage tank 10 in a sealing way; still be equipped with electric heater unit 24 in the liquid nitrogen storage tank 10, be equipped with relief valve 22 on the filler pipe 21, start-stop of filling system is by relief valve 22 and electric heater unit 24 joint control, and when electric heater unit 24 started and relief valve 22 closed, the filling system was in the filling state, and in the liquid nitrogen gasification back directly got into the dewar bottle this moment, when electric heater unit 24 closed and relief valve 22 opened, the filling system was in the state of stopping filling, and the gaseous nitrogen gas in the liquid nitrogen storage tank 10 directly discharges to the atmosphere through relief valve 22. The invention carries out integrated design and optimized improvement on the pump head of the liquid nitrogen automatic filling system for the FTIR online monitoring instrument, forces high-pressure nitrogen to enter the optical instrument by closing the pressure release valve 22, and leads the filling system to lose pressure by opening the pressure release valve 22, thereby stopping filling, and is assisted with a heating device for pressurization, thereby simply and efficiently realizing the timing and quantitative filling of the liquid nitrogen, and having good system stability and high working precision.
Example 1
As one embodiment of the present invention, the pressure relief valve 22 is an electromagnetic pressure relief valve 22, the start and stop of the electric heating device 24 and the pressure relief valve 22 are both controlled by an automatic controller, the automatic controller includes a timer, and the automatic controller automatically controls the start and stop states of the electric heating device 24 and the pressure relief valve 22 according to a set time period. The specific control method of the embodiment comprises the following steps: the electric heating device 24 and the pressure release valve 22 are opened and closed circularly according to a set time period, the pressure release valve 22 is closed synchronously when the electric heating device 24 is opened, the pressure release valve 22 is opened synchronously when the electric heating device 24 is closed, and the electric heating device 24 is opened once every 8-12h for 3-10min each time.
The system further comprises a liquid level meter 25 and a pressure sensor 23, wherein the liquid level meter 25 is inserted into the liquid nitrogen storage tank 10 from the bottle opening of the liquid nitrogen storage tank 10 and extends to the bottle bottom of the liquid nitrogen storage tank 10, and the pressure sensor 23 is in sealed communication with the bottle opening of the liquid nitrogen storage tank 10 through a hose; a safety valve is also arranged on the filling pipe 21.
Example 2
As another embodiment of the present invention, a temperature sensor is further disposed in a dewar of the FTIR online monitoring instrument, a signal output end of the temperature sensor is electrically connected to an automatic controller, and the automatic controller controls the start and stop of the pressure release valve 22 and the electric heating device 24 according to a signal collected by the temperature sensor. The specific control method of the embodiment comprises the following steps: according to the collection signal control electric heater unit 24 that sets up in the dewar bottle and opening of relief valve 22, specifically do: when the temperature is higher than-180 ℃, the electric heating device 24 is opened and the pressure relief valve 22 is closed, when the temperature is < -193 ℃, the liquid nitrogen adding is considered to be finished, and at the moment, the electric heating device 24 is closed and the pressure relief valve 22 is opened.
Example 3
As shown in fig. 4 and 5, a liquid nitrogen filling pump head includes a pump head base 20 disposed at a bottle opening of the liquid nitrogen storage tank 10, a vent passage is disposed in the pump head base 20, the fill pipe 21 is connected in series with the vent passage, the pressure relief valve 22 and a lead wire of the electric heating device 24 are mounted on the pump head base 20, the pump head base 20 is mounted with a pressure sensor 23 and a safety valve, and a safety pressure of the safety valve is set to 20 Kpa. According to the invention, the liquid nitrogen filling system is designed in an integrated manner, and all components are integrated on the pump head base 20, so that the disassembly and the assembly between the filling system and the liquid nitrogen storage tank 10 are greatly facilitated, and the liquid nitrogen storage tank 10 can be replaced quickly.
Specifically, the pressure release valve 22 includes a conical valve core 221, a pressure release hole communicated with the cavity of the filling pipe 21 is formed in the pump head base 20, the conical valve core 221 reciprocates along the vertical direction and forms an opening and closing action with the pressure release hole, the upper end of the conical valve core 221 is fixedly connected with the relay core, a return spring is sleeved on the conical valve core 221, and the lower end of the return spring is abutted to the orifice of the pressure release hole.
Still be equipped with protection shroud 30 on the pump head base 20, each sensor lead wire and control circuit board 32 integration are inside protection shroud 30, the pressure release hole also is located inside protection shroud 30, protection shroud 30 top is equipped with exhaust hole 31. When the filling system is in a standby state, the pressure release valve 22 is kept open, nitrogen can be filled into a cavity surrounded by the protective cover, self-protection of the system is achieved, and in addition, the cover is provided with the exhaust hole 31, so that normal pressure release of the system is ensured.
As shown in fig. 6 and 7, a connecting flange is arranged at the bottom of the pump head base 20, the connecting flange is butted with a flange at the bottle mouth of the liquid nitrogen storage tank 10, a sealing ring is arranged between the end surfaces of the two flanges, and the peripheries of the two flanges are clamped by a hough clamp 40; the two halves of the half-yoke 40 are arranged to reciprocate horizontally, and a locking mechanism is arranged on the top wall of the half-yoke 40 and is configured to apply a pressing force to the top surface of the flange of the pump head base 20 when the locking mechanism is locked.
As shown in fig. 6-10, the system further includes a lifting mechanism for driving the pump head base 20 to reciprocate in a vertical direction; elevating system includes lift slip table 45, pump head base 20 is connected with lift slip table 45, be equipped with first link gear between lift slip table 45 and the half formula clamp 40, first link gear is assembled for two halfbodies block that first link gear can drive half formula clamp 40 when lift slip table 45 is down, and two halfbodies separation that first link gear can drive half formula clamp 40 when lift slip table 45 goes upward.
The first linkage mechanism comprises horizontal guide rods 41 arranged on the outer sides of two half bodies of a half-type clamp 40, the guide rods 41 are connected with guide sleeves 42 arranged on the base 1 in a sliding mode, rollers 44 are arranged at one ends, far away from the half-type clamp 40, of the guide rods 41, springs 43 are arranged between the guide rods 41 and the guide sleeves 42, the springs 43 are assembled to enable the two half bodies of the half-type clamp 40 to move towards the directions far away from each other due to elasticity of the springs, wedge-shaped driving blocks 46 are arranged at positions, corresponding to the rollers 44, of the bottom of the lifting sliding table 45, and the wedge-shaped driving blocks 46 are assembled to enable the rollers 44 to extrude and drive the two half bodies of the half-type clamp 40 to be close to each other when the lifting sliding table 45 goes down.
The locking mechanism comprises a cam 401 hinged to the top wall of the half type hoop 40, the wheel surface of the cam 401 is abutted to the top surface of a flange on the pump head base 20, a swing rod 402 is fixed on the cam 401, the swing rod 402 is arranged in a suspending mode towards the outer side of the half type hoop 40, the swing rod 402 and the cam 401 are assembled in a mode that when the swing rod 402 is pressed downwards, the protruding portion of the cam 401 can downwards press the top surface of the flange of the pump head base 20, and when the swing rod 402 is pressed downwards to be abutted to the top surface of the half type hoop 40, the protruding portion of the cam 401 just swings to the lowest point, so that the cam 401 and the swing rod 402 are self-locked.
And a second linkage mechanism is arranged between the locking mechanism and the lifting sliding table 45, and is assembled to drive the swing rod 402 to press downwards when the lifting sliding table 45 goes downwards, and drive the swing rod 402 to lift upwards when the lifting sliding table 45 goes upwards.
Be equipped with the round hole that is used for dodging pump head base 20 on the lift slip table 45, second linkage includes that the round hole inner wall goes up to last shifting block 451 and the lower shifting block 452 of round hole center overhang setting, it is used for stirring pendulum rod 402 lower hem to go up shifting block 451, lower shifting block 452 is used for stirring pendulum rod 402 and lifts up, the overhang length of going up shifting block 451 is greater than the overhang length of shifting block 452 down, and the overhang length of shifting block 452 is set up to be located the pendulum rod 402 of lifting up the station completely down when lift slip table 45 is down shifting block 452, and shift block 452 can with be in the overhang end butt of the pendulum rod 402 of pushing down the station down when lift slip table 45 goes upward.
The bilateral symmetry of pump head base 20 is provided with horizontal uide pin 201, be equipped with the limiting plate on the top surface of lift slip table 45, seted up on the limiting plate with vertical waist type hole 47 of uide pin 201 sliding fit.
The both ends of lift slip table 45 are equipped with vertical screw hole respectively, lift slip table 45 constitutes screw-thread fit through this screw hole and two screw rods 48, the setting is rotated respectively at screw rod 48 both ends on frame 1, frame 1 top is equipped with elevator motor 49, elevator motor 49 constitutes transmission fit through synchronous pulley 491 and two screw rods 48.
As shown in fig. 11, the system further includes a liquid nitrogen storage tank 10 loading and unloading mechanism, the liquid nitrogen storage tank 10 loading and unloading mechanism includes a base 50 formed by a plurality of rollers 51 arranged in parallel in a rotating manner, one end of the base 50 is provided with a slope slideway 55, the upper portion of the base 50 is provided with a liquid nitrogen storage tank 10 positioning mechanism, the liquid nitrogen storage tank 10 positioning mechanism includes an arc-shaped back plate 56 arranged at one side far away from the slope slideway 55 and two elastic pressing rollers 54 symmetrically arranged at one side close to the slope slideway 55, a space for accommodating the liquid nitrogen storage tank 10 is formed between the two elastic pressing rollers 54 and the arc-shaped back plate 56, the two elastic pressing rollers 54 are arranged in a mutually opening and closing manner along the left and right direction, horizontal guide rods 52 are arranged on roller seats of the two elastic pressing rollers 54, the guide rods 52 form a sliding fit with the machine; the arc-shaped back plates 56 are arranged in a reciprocating manner along the front-back direction, and the engine base 1 is provided with a piston cylinder 57 for driving the arc-shaped back plates 56 to reciprocate.
The installation and disassembly processes of the liquid nitrogen storage tank 10 are as follows:
installing a steel cylinder: firstly, pushing the liquid nitrogen storage tank 10 to the base 50 along the slope slideway 55, extruding the elastic pressing roller 54 by the steel cylinder in the pushing process to open the elastic pressing roller 54, and resetting the elastic pressing roller 54 and pressing the steel cylinder tightly as the steel cylinder enters an installation station; then, the lifting motor 49 is started to drive the lifting sliding table 45 to move downwards, the pump head base 20 and components thereof fall to the opening of the steel cylinder by means of self gravity, then the lifting sliding table 45 continues to move downwards, the first linkage mechanism is triggered firstly to enable the two half bodies of the half hoop 40 to be folded, finally the lifting sliding table 45 continues to move downwards, the second linkage mechanism is triggered, the upper shifting block 451 presses the swing rod 402 down, and therefore the half hoop 40 is locked with the opening flange.
Disassembling the steel cylinder: firstly, starting a lifting motor 49, ascending a lifting sliding table 45, firstly triggering the second linkage mechanism to reset by the lifting sliding table 45 to unlock the locking mechanism, then continuously ascending, triggering the second linkage mechanism to reset immediately to separate two half bodies of the half hoop 40, then keeping the lifting sliding table 45 ascending, and supporting a pump head base 20 and components thereof until the pump head components are completely separated from a steel cylinder; and finally, starting the piston cylinder 57, ejecting the steel cylinder out of the base 50 by using the arc-shaped back plate 56, and completing the disassembly.
According to the invention, the liquid nitrogen storage tank 10 is quickly mounted and dismounted through a series of linkage mechanisms, only two sets of power mechanisms are needed in the whole process, the operation is simple and quick, and the equipment cost is greatly saved.
Claims (9)
1. The utility model provides a liquid nitrogen automatic filling system of FTIR on-line monitoring instrument which characterized in that: the device comprises a liquid nitrogen storage tank (10) and a filling pipe (21), wherein one end of the filling pipe (21) is inserted into the liquid nitrogen storage tank (10) from the bottle opening of the liquid nitrogen storage tank (10) and extends to the bottom of the liquid nitrogen storage tank (10), and the other end of the filling pipe is communicated with the inner cavity of a Dewar flask of an FTIR online monitoring instrument; the filling pipe (21) is hermetically connected with the opening of the liquid nitrogen storage tank (10); an electric heating device (24) is further arranged in the liquid nitrogen storage tank (10), a pressure release valve (22) is arranged on the filling pipe (21), the starting and stopping of the filling system are jointly controlled by the pressure release valve (22) and the electric heating device (24), when the electric heating device (24) is started and the pressure release valve (22) is closed, the filling system is in a filling state, liquid nitrogen directly enters the Dewar flask after being gasified at the moment, when the electric heating device (24) is closed and the pressure release valve (22) is started, the filling system is in a filling stopping state, and gasified nitrogen in the liquid nitrogen storage tank (10) is directly discharged to the atmosphere through the pressure release valve (22); a pump head base (20) is arranged at the bottle mouth of the liquid nitrogen storage tank (10), an exhaust passage is formed in the pump head base (20), the filling pipe (21) is connected with the exhaust passage in series, the pressure release valve (22) and a lead of the electric heating device (24) are arranged on the pump head base (20), and a pressure sensor (23) and/or a safety valve are/is arranged on the pump head base (20); the pressure release valve (22) comprises a conical valve core (221), a pressure release hole communicated with an official cavity of the filling pipe (21) is formed in the pump head base (20), the conical valve core (221) reciprocates along the vertical direction and forms opening and closing actions with the pressure release hole, the upper end of the conical valve core (221) is fixedly connected with the relay iron core, a reset spring is sleeved on the conical valve core (221), and the lower end of the reset spring is abutted to an orifice of the pressure release hole; still be equipped with protection shroud (30) on pump head base (20), each sensor lead wire and control circuit board (32) are integrated inside protection shroud (30), the pressure release hole also is located inside protection shroud (30), protection shroud (30) top is equipped with exhaust hole (31).
2. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 1, wherein: the pressure relief valve (22) is an electromagnetic pressure relief valve (22), the start and stop of the electric heating device (24) and the pressure relief valve (22) are controlled by an automatic controller, the automatic controller comprises a timer, and the automatic controller automatically controls the start and stop states of the electric heating device (24) and the pressure relief valve (22) according to a set time period; the system further comprises a liquid level meter (25) and a pressure sensor (23), wherein the liquid level meter (25) is inserted into the liquid nitrogen storage tank (10) from the bottle opening of the liquid nitrogen storage tank (10) and extends to the bottle bottom of the liquid nitrogen storage tank (10), and the pressure sensor (23) is in sealed communication with the bottle opening of the liquid nitrogen storage tank (10) through a hose; and a safety valve is also arranged on the filling pipe (21).
3. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 1, wherein: still be equipped with temperature sensor in the Dewar flask of FTIR on-line monitoring instrument, temperature sensor's signal output part is connected with the automatic control electricity, the automatic control opens and stops according to the signal control relief valve (22) that temperature sensor gathered and electric heater unit (24).
4. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 1, wherein: the bottom of the pump head base (20) is provided with a connecting flange, the connecting flange is in butt joint with a flange at the bottle mouth of the liquid nitrogen storage tank (10), a sealing ring is arranged between the end faces of the two flanges, and the peripheries of the two flanges are clamped through a half type clamp (40); the two half bodies of the half-type hoop (40) are arranged in a reciprocating mode along the horizontal direction, a locking mechanism is arranged on the top wall of the half-type hoop (40), and the locking mechanism is assembled to be capable of exerting pressing force on the top face of the flange of the pump head base (20) when the locking mechanism is locked.
5. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 4, wherein: the system also comprises a lifting mechanism for driving the pump head base (20) to reciprocate along the vertical direction; the lifting mechanism comprises a lifting sliding table (45), the pump head base (20) is connected with the lifting sliding table (45), a first linkage mechanism is arranged between the lifting sliding table (45) and the half type hoop (40), the first linkage mechanism is assembled to be capable of driving two half bodies of the half type hoop (40) to be clamped when the lifting sliding table (45) moves downwards, and the first linkage mechanism is capable of driving two half bodies of the half type hoop (40) to be separated when the lifting sliding table (45) moves upwards;
the first linkage mechanism comprises horizontal guide rods (41) arranged at the outer sides of two half bodies of a half-type hoop (40), the guide rod (41) is connected with a guide sleeve (42) arranged on the machine base (1) in a sliding way, one end of the guide rod (41) far away from the half type hoop (40) is provided with a roller (44), a spring (43) is arranged between the guide rod (41) and the guide sleeve (42), the spring (43) is arranged so that its spring force urges the halves of the half clamp (40) away from each other, a wedge-shaped driving block (46) is arranged at the position of the bottom of the lifting sliding table (45) corresponding to the roller (44), the wedge drive block (46) is arranged such that when the lift ramp (45) is lowered, a wedge-shaped driving block (46) capable of pressing against the roller (44) and driving the halves of the half-clamp (40) towards each other;
locking mechanism includes cam (401) with the top wall articulated of haff formula clamp (40), the wheel face of cam (401) and the top surface butt of the flange on pump head base (20), be fixed with a pendulum rod (402) on cam (401), pendulum rod (402) are to the outside overhang setting of haff formula clamp (40), pendulum rod (402) and cam (401) are assembled for the flange top surface that can extrude pump head base (20) downwards for the bulge of cam (401) when pendulum rod (402) pushes down, and thereby the bulge of cam (401) just swings the minimum when pendulum rod (402) pushes down to contradict with the top surface of haff formula clamp (40) makes cam (401) and pendulum rod (402) auto-lock.
6. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 5, wherein: a second linkage mechanism is arranged between the locking mechanism and the lifting sliding table (45), and is assembled to drive the swing rod (402) to press downwards when the lifting sliding table (45) goes downwards, and drive the swing rod (402) to lift upwards when the lifting sliding table (45) goes upwards;
the lifting sliding table (45) is provided with a round hole used for avoiding the pump head base (20), the second linkage mechanism comprises an upper shifting block (451) and a lower shifting block (452) which are arranged on the inner wall of the round hole in a hanging manner towards the center of the round hole, the upper shifting block (451) is used for shifting the swing rod (402) to swing downwards, the lower shifting block (452) is used for shifting the swing rod (402) to lift upwards, the hanging length of the upper shifting block (451) is larger than that of the lower shifting block (452), the hanging length of the lower shifting block (452) is set to be such a way that the lower shifting block (452) can completely avoid the swing rod (402) at the upper lifting station when the lifting sliding table (45) moves downwards, and the lower shifting block (452) can abut against the hanging end of the swing rod (402) at the lower pressing station when the lifting sliding table (45) moves upwards;
horizontal guide pins (201) are symmetrically arranged on two sides of the pump head base (20), a limiting plate is arranged on the top surface of the lifting sliding table (45), and a vertical waist-shaped hole (47) in sliding fit with the guide pins (201) is formed in the limiting plate;
the both ends of lift slip table (45) are equipped with vertical screw hole respectively, lift slip table (45) constitute screw-thread fit through this screw hole and two screw rods (48), screw rod (48) both ends are rotated respectively and are set up on frame (1), frame (1) top is equipped with elevator motor (49), elevator motor (49) constitute the transmission cooperation through synchronous pulley (491) and two screw rods (48).
7. The automatic liquid nitrogen filling system of the FTIR online monitoring instrument as recited in claim 6, wherein: the system also comprises a liquid nitrogen storage tank (10) loading and unloading mechanism, the liquid nitrogen storage tank (10) loading and unloading mechanism comprises a base (50) consisting of a plurality of rollers (51) which are arranged in parallel in a rotating manner, one end of the base (50) is provided with a slope slideway (55), the upper part of the base (50) is provided with a positioning mechanism of the liquid nitrogen storage tank (10), the positioning mechanism of the liquid nitrogen storage tank (10) comprises an arc-shaped back plate (56) which is arranged at one side far away from the slope slideway (55) and two elastic press rollers (54) which are symmetrically arranged at one side close to the slope slideway (55), a space for containing the liquid nitrogen storage tank (10) is formed between the two elastic press rollers (54) and the arc-shaped back plate (56), the two elastic press rollers (54) are arranged in a mutual opening and closing manner along the left and right directions, horizontal guide rods (52) are arranged on roller seats of the two elastic press, a pressure spring (53) is arranged between the roller seat and the machine base (1); the arc-shaped back plate (56) reciprocates back and forth, and a piston cylinder (57) for driving the arc-shaped back plate (56) to reciprocate is arranged on the machine base (1).
8. A control method of a liquid nitrogen automatic filling system of an FTIR online monitoring instrument as claimed in any one of claims 1 to 7, characterized in that: the electric heating device (24) and the pressure release valve (22) are opened and closed circularly according to a set time period, the pressure release valve (22) is closed synchronously when the electric heating device (24) is opened, the pressure release valve (22) is opened synchronously when the electric heating device (24) is closed, and the electric heating device (24) is opened once every 8-12h and for 3-10min each time.
9. A control method of a liquid nitrogen automatic filling system of an FTIR online monitoring instrument as claimed in any one of claims 1 to 7, characterized in that: according to the start and stop of temperature sensor's the collection signal control electric heater unit (24) that set up in the dewar bottle and relief valve (22), specifically do: when the temperature is higher than-180 ℃, the electric heating device (24) is opened and the pressure relief valve (22) is closed, when the temperature is < -193 ℃, the temperature is continuously maintained for 80s, namely the liquid nitrogen charging is considered to be finished, and then the electric heating device (24) is closed and the pressure relief valve (22) is opened.
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| CN201811331498.4A CN109488875B (en) | 2018-11-09 | 2018-11-09 | Liquid nitrogen automatic filling system of FTIR online monitoring instrument and control method thereof |
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| CN201811331498.4A CN109488875B (en) | 2018-11-09 | 2018-11-09 | Liquid nitrogen automatic filling system of FTIR online monitoring instrument and control method thereof |
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| CN110159917A (en) * | 2019-05-20 | 2019-08-23 | 中国自然资源航空物探遥感中心 | A kind of liquid nitrogen automatic filling device and liquid nitrogen automatic filling system |
| CN111188751B (en) * | 2020-01-16 | 2024-01-26 | 重庆贝纳吉液氮生物容器有限公司 | Method for extracting liquid nitrogen |
| CN112782248B (en) * | 2020-12-31 | 2022-12-13 | 东莞市雍华昊信息技术有限公司 | Sensing system |
| CN112833930B (en) * | 2020-12-31 | 2022-10-11 | 陕西拓普索尔电子科技有限责任公司 | Multifunctional sensing device |
| CN112648537A (en) * | 2020-12-31 | 2021-04-13 | 苏州联点数据技术有限公司 | Induction system |
| CN118129070A (en) * | 2024-05-06 | 2024-06-04 | 南通市港闸液化气罐场有限公司 | Filling table for liquefied petroleum gas cylinder and use method |
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| CA788175A (en) * | 1963-12-20 | 1968-06-25 | D. Lewis John | Method and apparatus for handling natural gas |
| CN103822087B (en) * | 2013-12-25 | 2017-01-11 | 国家电网公司 | SF6 (Sulfur Hexafluoride) integrated inflating device of substation equipment and use method thereof |
| CN205896681U (en) * | 2016-07-31 | 2017-01-18 | 杰瑞石油天然气工程有限公司 | Filling system that LNG is unpowered |
| CN108194827B (en) * | 2018-02-12 | 2023-09-15 | 国家电网公司 | Insulating gas treatment device and control method thereof |
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