CN104423405B - Nitrogen air conditioning control system and method - Google Patents
Nitrogen air conditioning control system and method Download PDFInfo
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- CN104423405B CN104423405B CN201310414708.7A CN201310414708A CN104423405B CN 104423405 B CN104423405 B CN 104423405B CN 201310414708 A CN201310414708 A CN 201310414708A CN 104423405 B CN104423405 B CN 104423405B
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Abstract
The invention provides a nitrogen air conditioning control system and method. The nitrogen air conditioning control system comprises an air compressor and a nitrogen making machine, wherein the air compressor is connected with the nitrogen making machine, the nitrogen making machine is connected with the air inlet of an air conditioning bin, the air compressor is connected with the air outlet of the air conditioning bin through a circulating pipeline, a circulating valve group is arranged on the circulating pipeline for controlling air in the air outlet of the air conditioning bin to enter the air compressor through the circulating pipeline, the nitrogen making machine continuously adsorb oxygen in the air to effectively improve the working efficiency of the nitrogen making machine, and the nitrogen air conditioning duration is correspondingly shortened, thus not only is the power saved, are the dissipation of the nitrogen making machine and assorted equipment reduced and the service life is prolonged, but also the quality and the freshness of stored food are improved.
Description
Technical field
The present invention relates to gas concentration monitoring and control technical field, being specifically related to a kind of nitrogen controlled atmosphere control system and method.
Background technology
Inflated with nitrogen conditioning technology is to be filled with appropriate nitrogen in confined conditions in warehouse or container with displaced air, the state of hypoxia or anoxybiotic it is chronically in making warehouse or in container, this technology is mainly used in the storage of the food such as grain, fruit and vegerable, nitrogen charging controlled atmosphere can with killing pests and suppressing bacteria, delay the shelf-life and keep food freshness.At inflated with nitrogen timing, airing form, nitrogen charging amount, capacity, air compensation, circulation etc. directly affect the quality of controlled atmosphere effect, and therefore, how inflated with nitrogen timing realizes the control of system is particularly important.
At present, traditional nitrogen controlled atmosphere control system uses outer circulation type, after starting nitrogen controlled atmosphere control system, extraneous air is as source of the gas, nitrogen controlled atmosphere control system is entered by air compressor, air cleaner it is transported to, to remove dust therein, moisture, mist of oil after the compression of air compressor.Air after purification is transported in nitrogen making machine again, to adsorb oxygen therein, finally give the nitrogen of high concentration and it is delivered in the air conditioned store for storing food, by the hyperoxia air (concentration is 21%) in the gas compartment (in the gas compartment=storehouse space-be stored material take up room) of nitrogen displacement air conditioned store, and the hyperoxia air in storehouse is emitted in the air outside storehouse, in order to reach applicable hypoxia storage environment.In the storage of food, by the artificial oxygen concentration reading nitrogen making machine outlet, and control the gas output that nitrogen making machine exports, to regulate the oxygen concentration in air conditioned store.
But, in actual use, it is found by the applicant that the controlled atmosphere process of traditional nitrogen controlled atmosphere control program is veryer long, typically require and long controlled atmosphere, not only increase power consumption, shorten the working life of nitrogen making machine and corollary equipment, also the quality of the food of storage and freshness can be produced impact.
Therefore, a kind of nitrogen controlled atmosphere control program is needed badly in order to solve above-mentioned technical problem.
Summary of the invention
The present invention is directed to above-mentioned deficiency present in prior art, it is provided that a kind of nitrogen controlled atmosphere control system and method, in order to solve the problem that existing scheme nitrogen controlled atmosphere is time-consumingly grown.
The present invention solves above-mentioned technical problem, adopt the following technical scheme that
A kind of nitrogen controlled atmosphere control system, including: air compressor and nitrogen making machine, air compressor is connected with nitrogen making machine, and nitrogen making machine is connected with the air inlet of air conditioned store, it is characterised in that
Air compressor is connected by circulation line with the gas outlet of air conditioned store, is provided with circulation valve group on circulation line, enters in air compressor via circulation line for controlling the gas of the gas outlet of air conditioned store.
Preferably, described circulation line includes that the first circulation line and the second circulation line, described one end of first circulation line are connected with the air inlet of air compressor, and described one end of second circulation line is connected with the gas outlet of air conditioned store；
Described circulation valve group includes: adjustable 5th valve of the first valve, the second valve and opening degree；The two ends of the first valve are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve is located on the second circulation line, and its one end connects with extraneous air, for controlling the break-make between the gas outlet of air conditioned store and extraneous air；5th valve is located on the first circulation line, and its one end connects with extraneous air, connects with extraneous air for controlling the air inlet of air compressor；Or, described circulation valve group includes: the first valve, the second valve, the 3rd valve and adjustable 4th valve of opening degree；The two ends of the first valve are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve is located on the second circulation line, and its one end connects with extraneous air, for controlling the break-make between the gas outlet of air conditioned store and extraneous air；3rd valve and the 4th valve are all located on the first circulation line, and one end of the 3rd valve connects with extraneous air, connect with extraneous air for controlling the air inlet of air compressor；One end of 4th valve connects with extraneous air, for controlling the degree that the air inlet of air compressor connects with extraneous air.
Further, this system also includes controller, is preset with air inlet duration in described controller；
The original state of described circulation valve group is to connect with extraneous air, and is not turned on air compressor；
Described controller is connected with circulation valve group, is used for controlling circulation valve group and turns on air compressor, so that extraneous air enters in air compressor via circulation line, and starts timing；And, when described air inlet duration arrives, control circulation valve group and completely cut off with extraneous air, so that the gas in air conditioned store enters described air compressor via circulation line.
Further, this system also includes that the first oxygen being arranged in air conditioned store divides instrument；Oxygen concentration threshold value also it is preset with in controller；
Described first oxygen divides instrument to be connected with controller, is sent to controller for the oxygen concentration detected value detected in the oxygen concentration in air conditioned store, and air conditioned store detection obtained；
Controller is connected with nitrogen making machine, and controller is additionally operable to, and is compared with the oxygen concentration threshold value preset by the oxygen concentration detected value in air conditioned store, and controls the start and stop of nitrogen making machine according to comparative result.
Further, this system also includes the effusion meter being arranged at the gas outlet of nitrogen making machine；
Described effusion meter is connected with controller, and for detecting the gas output of the gas outlet of nitrogen making machine, and gas output detected value detection obtained is sent to controller；
Controller is additionally operable to, when the oxygen concentration detected value judged in air conditioned store is more than the oxygen concentration threshold value preset, by gas output detected value compared with the metered flow value that nitrogen making machine is current, and control the connecting degree of circulation valve group and extraneous air according to comparative result；Wherein, if the former is less than the latter, then controls circulation valve group and connect with extraneous air, or, control circulation valve group and increase the degree connected with extraneous air, enter circulation line with supplementary extraneous air；If the former is more than the latter, then controls circulation valve group and reduce the degree connected with extraneous air.
Preferably, described controller specifically for, calculate the difference between tolerance detected value and the nitrogen making machine metered flow value under current operating state, and calculate the ratio between described difference and the nitrogen making machine metered flow value under current operating state；And, when judge gas output detected value less than nitrogen making machine at current operating state under metered flow value time, according to this ratio, increase the degree that circulation valve group connects with extraneous air；When judge gas output detected value more than nitrogen making machine at current operating state under metered flow value time, according to this ratio, reduce the degree that circulation valve group connects with extraneous air.
Preferably, controller specifically for, the oxygen concentration detected value judged in air conditioned store less than or equal to preset oxygen concentration threshold value time, control nitrogen making machine quit work.
Further, this system also includes temperature controlling machine, the first temperature measurer and the second temperature measurer；Temperature difference threshold Δ t it is additionally provided with in described controller；
Described temperature controlling machine is connected with the gas outlet of nitrogen making machine, for regulating the temperature of the gas outlet expellant gas of nitrogen making machine；
Described first temperature measurer is arranged in air conditioned store, and is connected with controller, is sent to controller for the temperature detection value t1 detected in the temperature in air conditioned store, and the air conditioned store that will detect；
Described second temperature measurer is arranged at the outlet of temperature controlling machine, and is connected with controller, for the temperature of detection gas after temperature controlling machine homoiothermic, and the temperature detection value t2 detected is sent to controller；
Described controller is additionally operable to, calculate the difference between t1 and t2, and judge that this difference is whether within the scope of default temperature difference threshold Δ t, if not existing, then send temperature regulation signal to temperature controlling machine, to indicate temperature controlling machine to regulate the temperature of the gas outlet expellant gas of nitrogen making machine to (t1 ± Δ t)；Wherein, if t1 is ＞ t2, then the temperature of the gas outlet expellant gas of nitrogen making machine is regulated to (temperature of the gas outlet expellant gas of nitrogen making machine if t1 is ＜ t2, is then regulated to (t1+ Δ t) by t1-Δ t).
A kind of nitrogen controlled atmosphere control method, in nitrogen controlled atmosphere control system, the method includes that initial gas adjusts rate-determining steps and operating controlled atmosphere rate-determining steps, and described operating controlled atmosphere rate-determining steps includes:
The gas outlet expellant gas of air conditioned store is delivered in the air inlet of the air compressor in nitrogen controlled atmosphere control system.
Concrete, described initial gas adjusts rate-determining steps to include: controls extraneous air and enters in air compressor, and starts timing, and controls to open nitrogen making machine；When default air inlet duration arrives, control air compressor and completely cut off with extraneous air.
Further, described operating controlled atmosphere rate-determining steps also includes: the oxygen concentration in detection air conditioned store, and the oxygen concentration detected value in air conditioned store detection obtained compares with the oxygen concentration threshold value preset, control the start and stop of nitrogen making machine further according to comparative result；Wherein, if the former is less than or equal to the latter, then controls nitrogen making machine and quit work；If the former is more than the latter, then controls nitrogen making machine and work on.
Further, described operating controlled atmosphere rate-determining steps also includes: detect the gas output of the gas outlet of nitrogen making machine when nitrogen making machine runs, and when the oxygen concentration detected value judged in air conditioned store is more than the oxygen concentration threshold value preset, gas output detected value detection obtained is compared with the metered flow value that nitrogen making machine is current, and controls the air inflow of extraneous air entrance nitrogen controlled atmosphere control system according to comparative result；Wherein, if the former is less than the latter, then increases extraneous air and enter the air inflow of nitrogen controlled atmosphere control system；If the former is more than the latter, then reduces extraneous air and enter the air inflow of nitrogen controlled atmosphere control system；
And,
Described operating controlled atmosphere rate-determining steps also includes that homoiothermic step, described homoiothermic step include:
Temperature in detection air conditioned store, obtains temperature detection value t1, and the temperature of the gas that detection is after homoiothermic, obtains temperature detection value t2；
Calculate the difference between t1 and t2, and judge that this difference, whether within the scope of default temperature difference threshold Δ t, if not existing, then carries out temperature regulation, in order to by gas temperature regulation to (t1 ± Δ t)；Wherein, if t1 is ＞ t2, then by gas temperature regulation to (t1-Δ t), if t1 is ＜ t2, then by gas temperature regulation to (t1+ Δ t).
There is advantages that
The present invention utilizes circulation line to connect air conditioned store and air compressor, circulation line arranges circulation valve group, and control circulation line by controlling this circulation valve group, in order to the gas in air conditioned store is delivered in the middle of nitrogen controlled atmosphere control system via this circulation line, continued to adsorb oxygen therein by nitrogen making machine, so, the oxygen concentration of the gas after a controlled atmosphere processes, can be lower than the oxygen concentration in extraneous air, the system that is again delivered to by this gas continues controlled atmosphere, the work efficiency of nitrogen making machine can be effectively improved, the time of nitrogen controlled atmosphere shortens accordingly, not only save electric power, reduce nitrogen making machine and the loss of corollary equipment, extension device service life, and, improve quality and the freshness of institute's preserved food products.
Accompanying drawing explanation
The structural representation of the nitrogen controlled atmosphere control system that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 is one of structural representation of circulation control valve group；
Fig. 3 is the two of the structural representation of circulation control valve group；
One of schematic flow sheet of nitrogen controlled atmosphere control method that Fig. 4 provides for the embodiment of the present invention:
The two of the schematic flow sheet of the nitrogen controlled atmosphere control method that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is carried out clear, complete description, it is clear that described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into the scope of protection of the invention.
As shown in Figure 1, embodiments provide a kind of nitrogen controlled atmosphere control system 1, this system at least includes: air compressor 10 and system with molecular sieve for preparing nitrogen machine 11, air compressor 10 is connected with system with molecular sieve for preparing nitrogen machine 11, system with molecular sieve for preparing nitrogen machine 11 is connected with the air inlet of air conditioned store 2, air compressor 10 is connected by circulation line with the gas outlet of air conditioned store 2, circulation line is provided with circulation valve group 12, enters in air compressor 11 via circulation line for controlling the gas of the gas outlet of air conditioned store 2.Wherein, the original state of circulation valve group 12 is and air communication, and is not turned on air compressor 10.
It should be noted that nitrogen controlled atmosphere control system 1 can also select other kinds of nitrogen making machine, such as, cryogenic air separation unit nitrogen making machine, film nitrogen production by air separation machine, the present invention illustrates as a example by system with molecular sieve for preparing nitrogen machine.
Being additionally provided with air processor (not illustrating in figure) between air compressor 10 and system with molecular sieve for preparing nitrogen machine 11, air processor may include that air reservoir, cooling driers, oil water separator, accurate filter and carbon bed filter.Air reservoir is used for storing air, balance pressure；Oil water separator, accurate filter and carbon bed filter are for removing the moisture in air, and mist of oil, dust etc., with purification, dry air.Air processor belongs to prior art, and its structure and annexation do not repeat them here.
Circulation line includes the first circulation line and the second circulation line, and one end of the first circulation line is connected with the air inlet of air compressor 10, and one end of the second circulation line is connected with the gas outlet of air conditioned store 2.
Fig. 2 and Fig. 3 sets forth two kinds of specific implementations of circulation valve group 12, below in conjunction with Fig. 2 and Fig. 3, the internal structure of both circulation valve groups 13 is elaborated, wherein, air compressor 10 is connected with the air inlet of air conditioned store 2 by system with molecular sieve for preparing nitrogen machine, in order to the structure of circulation valve group 12 is clearly described with having emphasis, system with molecular sieve for preparing nitrogen machine does not illustrates in figs. 2 and 3.
As in figure 2 it is shown, circulation valve group 12 includes: the first valve the 121, second valve the 122, the 3rd valve 123 and adjustable 4th valve 124 of opening degree.The two ends of the first valve 121 are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve 122 is located on the second circulation line, and its one end connects with extraneous air, the break-make between gas outlet and the extraneous air controlling air conditioned store 2；3rd valve 123 and the 4th valve 124 are all located on the first circulation line, and one end of the 3rd valve 123 connects with extraneous air, connect with extraneous air for controlling the air inlet of air compressor 10；One end of 4th valve 124 connects with extraneous air, and for controlling the degree that the air inlet of air compressor 10 connects with extraneous air, the i.e. the 3rd valve 123 is in parallel with the 4th valve 124.
When closing the second valve the 122, the 3rd valve 123 and the 4th valve 124, and during conducting the first valve 121, gas in air conditioned store 2 can enter in air compressor 10 via circulation line (the most successively via the second circulation line and the first circulation line), and extraneous air cannot be introduced into nitrogen controlled atmosphere control system 1, thus realize gas body-internal-circulation.When closing the second valve 122 and the 3rd valve 123, and when turning on the first valve 121 and four valves 124, extraneous air can enter the first circulation line by the 4th valve 124, and is delivered in air compressor 10 via the first circulation line.When closing the first valve 121, when turning on the second valve the 122, the 3rd valve 123 and four valves 124, circulation valve group 12 is in original state, extraneous air enters air conditioned store 2 by the second valve 122, but do not enter air compressor 10, i.e. air conditioned store 2 is connected with extraneous air by the second circulation line and the second valve 122.
Preferably, first valve the 121, second valve 122 and the 3rd valve 123 can use electrically-controlled valve, and the 4th valve 124 can use the adjustable ball valve of opening degree, to control the degree that Circulation valve 12 connects with extraneous air.
In order to simplify the internal structure of circulation valve group 12,3rd valve 123 and the 4th valve 124 can be merged into adjustable 5th valve 125 of opening degree, as it is shown on figure 3, circulation valve group 12 includes: first valve the 121, second valve 122 and adjustable 5th valve 125 of opening degree；The two ends of the first valve 121 are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve 122 is located on the second circulation line, and its one end connects with extraneous air, the break-make between gas outlet and the extraneous air controlling air conditioned store 2；5th valve 125 is located on the first circulation line, and its one end connects with extraneous air, connects with extraneous air for controlling the air inlet of air compressor 10.
When closing the second valve 122 and the 5th valve 125, and during conducting the first valve 121, gas in air conditioned store 2 can enter in air compressor 10 via circulation line (the most successively via the second circulation line and the first circulation line), and extraneous air cannot be introduced into nitrogen controlled atmosphere control system 1, thus realize gas body-internal-circulation.When closing the second valve 122, when turning on the first valve 121 and conducting five valve 125, under the effect of air compressor 10, extraneous air can enter the first circulation line by the 5th valve 125 of conducting, and is delivered in air compressor 10 via the first circulation line.When closing the first valve 121, when turning on the second valve 122 and five valves 125, circulation valve group 12 is in original state, gas in air conditioned store 2 can be expelled to outside storehouse via the second valve 122, and extraneous air can enter air conditioned store 2 by the second valve 122, i.e. air conditioned store 2 is connected with extraneous air by the second circulation line and the second valve 122, and so, under original state, the nitrogen gas concn in air conditioned store 2 is identical with the nitrogen gas concn in air.During additionally, circulation valve group 12 is in original state, the 5th valve 125 is also at conducting state, in order to be delivered in air compressor 10 by extraneous air.
Preferably, first valve the 121, second valve 122 and the 5th valve 125 can use electrically-controlled valve to realize, and wherein, the opening degree of the 5th valve 125 is adjustable.
Preferably, the nitrogen controlled atmosphere control system 1 that the embodiment of the present invention provides may also include controller 13, for controlling closedown and the conducting of circulation valve group 12, and the start and stop of system with molecular sieve for preparing nitrogen machine 11, it is preset with air inlet duration in controller 13.Preferably, controller 13 can use PLC (Programmable Logic Controller, programmable logic controller (PLC)).
Controller 13 is connected with circulation valve group 12, turn on air compressor 10 for controlling circulation valve group 12, so that extraneous air enters in air compressor 10 via circulation line, and start timing, and, when air inlet duration arrives, control circulation valve group 12 and completely cut off with extraneous air, so that the gas in air conditioned store 2 enters air compressor 10 via circulation line, thus realize the gas body-internal-circulation of nitrogen controlled atmosphere control system.
For clearer explanation technical scheme, the most all illustrate as a example by the structure (structures of 3 valves) of the circulation valve group 12 shown in Fig. 3.
Concrete, when starting this nitrogen controlled atmosphere control system 1, controller 13 can be according to user instruction, control signal is sent to system with molecular sieve for preparing nitrogen machine 11, to open system with molecular sieve for preparing nitrogen machine 11, and, control conducting the first valve 121, close the second valve 122 and keep the 5th valve 125 to turn on, the 5th valve 125 making extraneous air pass through conducting enters in air compressor 10 via circulation line, in order to provide gas source for system with molecular sieve for preparing nitrogen machine 11.It should be noted that controller 13 starts timing, to monitor the inlet period of extraneous air when controlling conducting the first valve 121.Air inlet duration it is preset with in controller 13, when air inlet duration arrives, controller 13 controls the 5th valve 125 in circulation valve group 12 and cuts out and keep the second valve 122 to cut out, so that Circulation valve 12 is completely cut off with extraneous air, and, control the first valve 121 and be held on, so that the gas in air conditioned store 2 is by the first valve 121, air compressor 10 is entered, it is achieved the gas body-internal-circulation of nitrogen controlled atmosphere control system via circulation line.
Further, nitrogen controlled atmosphere control system 1 according to the oxygen concentration in air conditioned store 2, can also control the start and stop of system with molecular sieve for preparing nitrogen machine 11, to save the energy, to improve system automation degree.This nitrogen controlled atmosphere control system 1 also includes that the first oxygen divides instrument 14.Also being preset with oxygen concentration threshold value in controller 13, this oxygen concentration threshold value preset is set to consistent with for the aimed oxygen concn in air conditioned store 2.
First oxygen divides instrument 14 to be arranged in air conditioned store 2, and is connected with controller 13, and for detecting the oxygen concentration in air conditioned store 2, and the oxygen concentration detected value in the air conditioned store 2 that will obtain after detection is sent to controller 13.
Controller 13 is connected with system with molecular sieve for preparing nitrogen machine 11, and controller 13 is additionally operable to, and the oxygen concentration threshold value that the oxygen concentration detected value in air conditioned store 2 is preset with Qi Nei is compared, and controls the start and stop of system with molecular sieve for preparing nitrogen machine 11 according to comparative result.Wherein, when the former is less than or equal to the latter, illustrate that the oxygen concentration in air conditioned store 2, at or below default aimed oxygen concn (i.e. in air conditioned store 2, the nitrogen gas concn of gas is more than or equal to the target nitrogen gas concn preset), controls system with molecular sieve for preparing nitrogen machine 11 and quits work.When the former is more than the latter, illustrating that the oxygen concentration in air conditioned store 2 not yet reaches default aimed oxygen concn, controller does not sends control instruction to system with molecular sieve for preparing nitrogen machine, so that system with molecular sieve for preparing nitrogen machine 11 continues to remain on state.
Further, in order to realize automatically controlling of system with molecular sieve for preparing nitrogen machine 11, the duty of system with molecular sieve for preparing nitrogen machine 11 being adjusted optimally, nitrogen controlled atmosphere control system 1 also includes effusion meter 15.Effusion meter 15 is arranged at the gas outlet of system with molecular sieve for preparing nitrogen machine 11, and is connected with controller 13, for the gas output of the gas outlet of detection molecules sieve nitrogen making machine 11, and the gas output detected value obtained after detection is sent to controller 13.
Controller 13 is additionally operable to, when the oxygen concentration detected value judged in air conditioned store 2 is more than the oxygen concentration threshold value preset, gas output detected value is compared with the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, and controls the connecting degree of circulation valve group and extraneous air according to comparative result.Wherein, the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state is when nitrogen controlled atmosphere control system 1 initializes, and is arranged in controller 13.
If the metered flow value that gas output detected value is current less than system with molecular sieve for preparing nitrogen machine 11, treat in nitrogen controlled atmosphere control system 1 is described that the oxygen concentration in the gas of controlled atmosphere cannot meet system with molecular sieve for preparing nitrogen machine 11 and currently carry out saturated requirements of one's work, in order to improve the operational efficiency of system with molecular sieve for preparing nitrogen machine 11, controller 13 can control circulation valve group 12 and connect with extraneous air, entering circulation line with supplementary extraneous air, the 5th valve 125 during i.e. controller 13 controls circulation valve group 12 turns on.Preferably, it is partially ON that controller 13 can control the 5th valve 125, and control the second valve 122 and remain turned-off, and control the first valve 121 and be held on.Or, controller 13 controls circulation valve group 12 and increases the degree that connects with extraneous air, i.e. controller 13 and can control the 5th valve group 125 and increase opening degree, and controls the second valve 122 and remain turned-off, and control the first valve 121 is held on.
If gas output detected value is more than the metered flow value under system with molecular sieve for preparing nitrogen machine 11 current operating state, illustrate that the opening degree of the 5th valve 125 is excessive, the air entering nitrogen controlled atmosphere control system 1 is too much, then control circulation valve group 12 and reduce the degree connected with extraneous air, i.e. controller 13 controls the 5th valve 125 and reduces opening degree, and control the first valve 121 and be held on, and control the second valve 122 and remain turned-off.
Concrete, controller 13 is used for, calculate the difference between tolerance detected value and the current metered flow value of system with molecular sieve for preparing nitrogen machine 11, and, calculate the ratio between described difference and the current metered flow value of system with molecular sieve for preparing nitrogen machine 11, and according to this ratio, the degree that regulation circulation valve group 12 connects with extraneous air, with the accurate air inflow controlling to enter the extraneous air of nitrogen controlled atmosphere control system.
When the metered flow value that gas output detected value is current less than system with molecular sieve for preparing nitrogen machine 11, controller 13 is according to described ratio, control circulation valve group 12 and increase the degree that circulation valve group 12 connects with extraneous air, i.e., controller 13 is according to described ratio, the corresponding opening degree increasing by the 5th valve 125, to supplement corresponding extraneous air entrance circulation line.
When the metered flow value that gas output detected value is current equal to system with molecular sieve for preparing nitrogen machine 11, the degree that circulation valve group 12 is not connected by controller 13 with extraneous air is adjusted, so that system with molecular sieve for preparing nitrogen machine 11 keeps current gas output.
When the metered flow value that gas output detected value is current more than system with molecular sieve for preparing nitrogen machine 11, controller 13, according to described ratio, controls circulation valve group 12 and reduces the degree that circulation valve group 12 connects with extraneous air, i.e., controller 13 is according to described ratio, the corresponding opening degree reducing the 5th valve 125.
The embodiment of the present invention connects air conditioned store and air compressor by utilizing circulation line, and circulation valve group is set on circulation line, and control circulation line by controlling this circulation valve group, in order to the gas in air conditioned store is delivered in nitrogen controlled atmosphere control system via this circulation line, the work efficiency of nitrogen making machine can be effectively improved, and shorten the time of nitrogen controlled atmosphere.To replace 200m3As a example by air in space, by system with molecular sieve for preparing nitrogen machine ability to work with gas production as 50m3/ h, aerogenesis concentration be 99.0% nitrogen calculate, if the oxygen concentration of the gas compartment of air conditioned store is down to less than 2% by 21%, the most at least need to meet requirement in more than 15 hours.Relative to prior art needs to obtain source of the gas from extraneous air, and by oxygen concentration from 21% be down to below 2% for, the nitrogen controlled atmosphere control system of the present invention makes full use of the source of the gas (its oxygen concentration is less than the oxygen concentration 21% in air) as the equipment of making nitrogen of the gas in air conditioned store, oxygen concentration is down to less than 2%, whole controlled atmosphere process has only to about 10 hours, carries out corresponding controlled atmosphere process than prior art in time and to shorten a lot.
Further, in order to control to enter the temperature of the gas of air conditioned store 2, avoid the excessive temperature differentials between the gas temperature in the temperature of gas outlet expellant gas (nitrogen) from system with molecular sieve for preparing nitrogen machine 11 and air conditioned store, produce the phenomenon of condensation, causing the article in air conditioned store to go mouldy, nitrogen controlled atmosphere control system 1 can also include temperature controlling machine 17.
Temperature controlling machine 17 is connected with the gas outlet of system with molecular sieve for preparing nitrogen machine 11, for the temperature of the gas outlet expellant gas of Molecular regulator sieve nitrogen making machine 11, such as, gas is heated or cooled.
Preferably, nitrogen controlled atmosphere control system 1 can also include: the first temperature measurer 18 and the second temperature measurer 19.Temperature difference threshold Δ t also it is preset with in controller 13.
First temperature measurer 18 is arranged in air conditioned store 2, and is connected with controller 13, is sent to controller 13 for the temperature detection value t1 detected in the temperature in air conditioned store 2, and the air conditioned store 2 detection obtained.
Second temperature measurer 19 can be arranged at the exit of temperature controlling machine 17, and is connected with controller 13, and for the temperature of detection gas after temperature controlling machine 17 homoiothermic, and temperature detection value t2 detection obtained is sent to controller 13.
Controller 13 is connected with temperature controlling machine 17, controller 13 is additionally operable to, calculate the difference between t1 and t2, and judge that this difference is whether within the scope of default temperature difference threshold Δ t, if not existing, then send temperature regulation signal to temperature controlling machine 17, to indicate temperature controlling machine 17 to regulate the temperature of the gas outlet expellant gas of system with molecular sieve for preparing nitrogen machine 11 to (t1 ± Δ t) according to this temperature regulation signal, i.e. so that t2=(t1 ± Δ t).Wherein, if t1 is ＞ t2, then the temperature of the gas outlet expellant gas of system with molecular sieve for preparing nitrogen machine 11 is regulated to (temperature of the gas outlet expellant gas of system with molecular sieve for preparing nitrogen machine 11 if t1 is ＜ t2, is then regulated to (t1+ Δ t) by t1-Δ t).
The embodiment of the present invention also provides for a kind of nitrogen controlled atmosphere control method, in nitrogen controlled atmosphere control system, the method includes that initial gas adjusts rate-determining steps and operating controlled atmosphere rate-determining steps, and described operating controlled atmosphere rate-determining steps includes: be delivered in the air inlet of air compressor by the gas outlet expellant gas of air conditioned store.
Below as a example by the structure of the circulation control valve group shown in Fig. 3, in conjunction with Fig. 1 and Fig. 4, rate-determining steps and operating controlled atmosphere rate-determining steps is adjusted to elaborate respectively the initial gas in nitrogen controlled atmosphere control flow.
Be first carried out initial gas adjust rate-determining steps, i.e. step 401:
Step 401, controls extraneous air and enters in air compressor, and start timing, and controls to open system with molecular sieve for preparing nitrogen machine 11.
Concrete, controller 13 can send control signal according to user instruction to circulation valve group 12, turns on air compressor 10 controlling circulation valve group 12.I.e., controller 13 controls conducting the first valve 121, cuts out the second valve 122 and keep the 5th valve 125 to turn on, the 5th valve 125 making extraneous air pass through conducting enters in air compressor 10 via circulation line (the first circulation line), in order to provide gas source for system with molecular sieve for preparing nitrogen machine 11.
In controller 13, timing module can be set, when controller 13 control the first valve 121 turn on time, timing module starts timing, to monitor the inlet period of extraneous air.
Controller 13 controls system with molecular sieve for preparing nitrogen machine 11 and opens, it is preferred that controller 13 controls system with molecular sieve for preparing nitrogen machine 11 and runs with the operational taps that maximum gas output is corresponding.
After initial gas adjusts rate-determining steps to be finished, perform operating controlled atmosphere rate-determining steps, i.e. perform step 402-409.
Step 402, when air inlet duration arrives, controls air compressor 10 and completely cuts off with extraneous air.
Concrete, when air inlet duration arrives, controller 13 controls circulation valve group 12 and completely cuts off with extraneous air, so that the gas in air conditioned store 2 enters air compressor 10 via circulation line.That is, timing module stops timing, and controller 13 controls the 5th valve 125 in circulation valve group 12 and cuts out and keep the second valve 122 to cut out, in order to by Circulation valve 12 and air exclusion, to stop extraneous air to enter nitrogen controlled atmosphere control system 1.
Step 403, is delivered to the gas outlet expellant gas of air conditioned store 2 in the air inlet of air compressor 10.
Concrete, controller 13 controls the first valve 121 and is held on, so that the gas in air conditioned store 2 is by the first valve 121, enter air compressor 10 via circulation line (the i.e. second circulation line and the first circulation line), it is achieved the gas body-internal-circulation of nitrogen controlled atmosphere control system.
Step 404-405, the oxygen concentration in detection air conditioned store 2, and the oxygen concentration detected value A in the air conditioned store 2 detection obtained compare with the oxygen concentration threshold value preset, if the former is less than or equal to the latter, then perform step 406；Otherwise, control system with molecular sieve for preparing nitrogen machine 11 to work on.
Along with system with molecular sieve for preparing nitrogen machine 11 supplying nitrogen in air conditioned store 2, the nitrogen gas concn in air conditioned store 2 is gradually increased, and accordingly, oxygen concentration is gradually decreased, and controller 13 can divide instrument 14 to obtain the oxygen concentration detected value A in air conditioned store 2 in real time by the first oxygen.
When controller 13 by oxygen concentration detected value A with preset oxygen concentration threshold value compared with, and when judging the oxygen concentration detected value A in air conditioned store 2 less than or equal to the oxygen concentration threshold value preset, illustrate that the nitrogen gas concn in air conditioned store 2 has reached at or above target nitrogen gas concn, then control system with molecular sieve for preparing nitrogen machine 11 to quit work, i.e. perform step 406.
When the oxygen concentration detected value A in air conditioned store 2 judged by controller 13 is more than the oxygen concentration threshold value preset, nitrogen gas concn in air conditioned store 2 still miss the mark nitrogen gas concn is described, then controller 13 does not sends control instruction to system with molecular sieve for preparing nitrogen machine, so that system with molecular sieve for preparing nitrogen machine continues to remain on state, even system with molecular sieve for preparing nitrogen machine 11 works on.
Step 406, controls system with molecular sieve for preparing nitrogen machine 11 and quits work.
Concrete, when controller 13 judges that gas goes out to adjust the oxygen concentration detected value in storehouse 2 less than or equal to the oxygen concentration threshold value preset, send control signal to system with molecular sieve for preparing nitrogen machine 11, quit work controlling system with molecular sieve for preparing nitrogen machine 11.
It should be noted that when the oxygen concentration detected value A in air conditioned store 2 judged by controller 13 is more than the oxygen concentration threshold value preset, controller 13 can continue executing with step 404.
Be can be seen that by above-mentioned flow process, after nitrogen controlled atmosphere control system starts (i.e. system with molecular sieve for preparing nitrogen machine 11 is opened), controller 13 can automatically control the connecting degree of circulation valve group 12 regulation and extraneous air, and after the oxygen concentration in air conditioned store 2 reaches default aimed concn, automatically control system with molecular sieve for preparing nitrogen machine 11 to quit work, omnidistance without manual monitoring, regulation, save human cost, improve the automaticity of nitrogen controlled atmosphere control system, and this operating process is simple, control in time, accurately.
Further, in system with molecular sieve for preparing nitrogen machine 11 work process, the oxygen concentration of the gas being delivered to system with molecular sieve for preparing nitrogen machine 11 from air conditioned store 2 is real-time change (being gradually reduced), in order to make system with molecular sieve for preparing nitrogen machine 11 be adjusted to optimum Working, controller 13 can also control circulation valve group 12 and air communication, enters nitrogen controlled atmosphere control system 1 with supplementary air.After even judging that the oxygen concentration detected value in air conditioned store 2 is more than the oxygen concentration threshold value preset, it is also possible to execution following steps:
Compared with the metered flow value that step 407-408, the gas output of gas outlet of detection molecules sieve nitrogen making machine 11, and the gas output detected value that detection obtained are current with system with molecular sieve for preparing nitrogen machine 11, if the former is less than the latter, then execution step 409；If the former is more than the latter, then perform step 410；If the former is equal to the latter, then keep the gas output that system with molecular sieve for preparing nitrogen machine 11 is current.
Concrete, controller 13 obtains the gas output detected value of the system with molecular sieve for preparing nitrogen machine 11 that effusion meter 15 sends, and by compared with gas output detected value and the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state.
If controller 13 judges that tolerance detected value is less than the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, lack of air in nitrogen controlled atmosphere control system 1 is described, system with molecular sieve for preparing nitrogen machine 11 cannot work under metered flow, then controller 13 controls circulation valve group 12 and air communication, or, control circulation valve group 12 and increase the degree connected with extraneous air, with supplementary air, i.e. perform step 409.
If controller 13 judges that gas output detected value is more than the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, illustrate that the degree that circulation valve group 12 connects with extraneous air is excessive, the air entering nitrogen controlled atmosphere control system 1 is too much, then controller 13 controls circulation valve group 12 and reduces the degree connected with extraneous air, to reduce the air capacity entering nitrogen controlled atmosphere control system 1, i.e. perform step 410 (now, circulation valve group 12 and air compressor 10 remain on).
If gas output detected value is equal to the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, then the degree that circulation valve group 12 is not connected by controller 13 with extraneous air is adjusted, so that system with molecular sieve for preparing nitrogen machine 11 keeps current gas output.
Step 409, increases extraneous air and enters the air inflow of nitrogen controlled atmosphere control system.
Concrete, controller 13 controls circulation valve group 12 and connects with extraneous air, or, control circulation valve group 12 and increase the degree connected with extraneous air, enter circulation line with supplementary air.
Controller 13 can remain turned-off by controlling the second valve 122, first valve 121 is held on, and control the 5th valve 125 and turn on, or, control the second valve 122 to remain turned-off, first valve 121 is held on, and controls to increase the degree that the 5th valve connects with extraneous air, to control circulation valve group 12 and air communication.
Concrete, controller 13 calculates the difference between the gas output detected value of system with molecular sieve for preparing nitrogen machine 11 and the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, and, calculate the ratio between described difference and the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, and according to this ratio, increase the degree of circulation valve group 12 and air communication, i.e. according to this ratio, increase the opening degree of the 5th valve 125.
Controller 13 controls circulation valve group 12 and air communication, circulation line is entered with supplementary air, or after controlling the degree that the increase of circulation valve group connects with extraneous air, continue executing with step 404, during until the oxygen concentration detected value A in air conditioned store 2 is less than or equal to the oxygen concentration threshold value preset, controller 13 controls system with molecular sieve for preparing nitrogen machine 11 and quits work.
Step 410, reduces extraneous air and enters the air inflow of nitrogen controlled atmosphere control system.
Concrete, controller 13 reduces the degree that circulation valve group 12 connects, i.e. controller 13 opening degree by reduction the 5th valve 125 with extraneous air, reduces the degree that circulation valve group 12 connects with extraneous air.
Controller 13 calculates the difference between the gas output detected value of system with molecular sieve for preparing nitrogen machine 11 and the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, and, calculate the ratio between described difference and the system with molecular sieve for preparing nitrogen machine 11 metered flow value under current operating state, and according to this ratio, reduce the degree of circulation valve group 12 and air communication, i.e. according to this ratio, reduce the opening degree of the 5th valve 125.
After controller 13 reduces the degree that circulation valve group 12 connects with extraneous air,
Continuing executing with step 404, during until the oxygen concentration detected value A in air conditioned store 2 is less than or equal to the oxygen concentration threshold value preset, controller 13 controls system with molecular sieve for preparing nitrogen machine 11 and quits work.
Be can be seen that by step 406-410, controller 13 is by comparing the oxygen concentration detected value in air conditioned store and oxygen concentration threshold value, when oxygen concentration reaches default aimed oxygen concn, it is possible to automatically control system with molecular sieve for preparing nitrogen machine 11 and quit work, reduce manual supervisory human cost.And, by comparing the current gas output of system with molecular sieve for preparing nitrogen machine 11 and the metered flow under current operating state, automatically control the connecting degree of circulation valve group 12 and extraneous air, improve system automation degree.
Further, in order to control to enter the temperature of the gas of air conditioned store 2, avoid the excessive temperature differentials between the temperature in the temperature of system with molecular sieve for preparing nitrogen machine 11 expellant gas and air conditioned store, produce the phenomenon of condensation, stored goods is caused to go mouldy, as it is shown in figure 5, the nitrogen controlled atmosphere control method of the embodiment of the present invention can also comprise the following steps:
Step 501, the temperature in detection air conditioned store, obtain temperature detection value t1, and the temperature of the gas that detection is after homoiothermic, obtain temperature detection value t2.
Concrete, controller 13 obtains the temperature detection value t1 in the air conditioned store 2 that the first temperature measurer 18 sends, and obtains the temperature detection value t2 of the gas after temperature controlling machine 17 homoiothermic that the second temperature measurer 19 sends.
More specifically, temperature controlling machine 17 can be arranged at the gas outlet of system with molecular sieve for preparing nitrogen machine 11, described temperature controlling machine 17 can be used in the temperature of the gas outlet expellant gas of Molecular regulator sieve nitrogen making machine 11.
Can arrange the first temperature measurer 18 in air conditioned store 2, the first temperature measurer 18 is connected with controller 13, is sent to controller 13 for the temperature detection value t1 detected in the temperature in air conditioned store 2, and the air conditioned store 2 detection obtained；Can arrange the second temperature measurer 19 in the exit of temperature controlling machine 17, the second temperature measurer 19 is connected with controller 13, and for the temperature of detection gas after temperature controlling machine 17 homoiothermic, and temperature detection value t2 detection obtained is sent to controller 13.
Step 502, calculates the difference between t1 and t2.
Concrete, controller 13 calculates the difference between t1 and t2.
Step 503, it is judged that whether this difference is within the scope of default temperature difference threshold Δ t, if not existing, then performs step 504, otherwise, keeps the temperature that gas is current.
Concrete, controller 13 judges that this difference is whether within the scope of default temperature difference threshold Δ t, if the difference judged between t1 and t2 is not within the scope of Δ t, illustrate system with molecular sieve for preparing nitrogen machine 11 gas outlet gas temperature and air conditioned store 2 in the excessive temperature differentials of gas temperature, need to carry out homoiothermic, i.e. perform step 504.If controller 13 judges that the difference between t1 and t2 is within the scope of Δ t, illustrate that the gas temperature of the gas outlet of system with molecular sieve for preparing nitrogen machine 11 is moderate with the temperature difference of the gas temperature in air conditioned store 2, without homoiothermic, keep the temperature that the gas of the gas outlet of system with molecular sieve for preparing nitrogen machine 11 is current.
Step 504, carries out temperature regulation, in order to by gas temperature regulation to (t1 ± Δ t).
Concrete, controller 13 sends temperature regulation signal to temperature controlling machine 17, to indicate temperature controlling machine 17 by t2 regulation to (t1 ± Δ t).Wherein, if t1 is ＞ t2, then gas temperature is regulated to (t1-Δ t), i.e. temperature controlling machine 17 carry out heating operation to the gas of the gas outlet of system with molecular sieve for preparing nitrogen machine 11.If t1 is ＜ t2, then gas temperature is regulated to (t1+ Δ t), temperature controlling machine 17 carries out refrigerating operation to the gas of the gas outlet of system with molecular sieve for preparing nitrogen machine 11.
It is understood that the principle that is intended to be merely illustrative of the present of embodiment of above and the illustrative embodiments that uses, but the invention is not limited in this.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (10)
1. a nitrogen controlled atmosphere control system, including: air compressor and nitrogen making machine, air compressor is connected with nitrogen making machine, and nitrogen making machine is connected with the air inlet of air conditioned store, it is characterised in that
Air compressor is connected by circulation line with the gas outlet of air conditioned store, is provided with circulation valve group on circulation line, enters in air compressor via circulation line for controlling the gas of the gas outlet of air conditioned store；This system also includes controller, is preset with air inlet duration in described controller；
The original state of described circulation valve group is to connect with extraneous air, and is not turned on air compressor；
Described controller is connected with circulation valve group, is used for controlling circulation valve group and turns on air compressor, so that extraneous air enters in air compressor via circulation line, and starts timing；And, when described air inlet duration arrives, control circulation valve group and completely cut off with extraneous air, so that the gas in air conditioned store enters described air compressor via circulation line.
2. control system as claimed in claim 1, it is characterized in that, described circulation line includes that the first circulation line and the second circulation line, described one end of first circulation line are connected with the air inlet of air compressor, and described one end of second circulation line is connected with the gas outlet of air conditioned store；
Described circulation valve group includes: adjustable 5th valve of the first valve, the second valve and opening degree；The two ends of the first valve are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve is located on the second circulation line, and its one end connects with extraneous air, for controlling the break-make between the gas outlet of air conditioned store and extraneous air；5th valve is located on the first circulation line, and its one end connects with extraneous air, connects with extraneous air for controlling the air inlet of air compressor；Or,
Described circulation valve group includes: the first valve, the second valve, the 3rd valve and adjustable 4th valve of opening degree；The two ends of the first valve are connected with the first circulation line and the second circulation line respectively, for controlling the break-make between the first circulation line and the second circulation line；Second valve is located on the second circulation line, and its one end connects with extraneous air, for controlling the break-make between the gas outlet of air conditioned store and extraneous air；3rd valve and the 4th valve are all located on the first circulation line, and one end of the 3rd valve connects with extraneous air, connect with extraneous air for controlling the air inlet of air compressor；One end of 4th valve connects with extraneous air, for controlling the degree that the air inlet of air compressor connects with extraneous air.
3. control system as claimed in claim 1, it is characterised in that this system also includes that the first oxygen being arranged in air conditioned store divides instrument；Oxygen concentration threshold value also it is preset with in controller；
Described first oxygen divides instrument to be connected with controller, is sent to controller for the oxygen concentration detected value detected in the oxygen concentration in air conditioned store, and air conditioned store detection obtained；
Controller is connected with nitrogen making machine, and controller is additionally operable to, and is compared with the oxygen concentration threshold value preset by the oxygen concentration detected value in air conditioned store, and controls the start and stop of nitrogen making machine according to comparative result.
4. control system as claimed in claim 3, it is characterised in that this system also includes the effusion meter being arranged at the gas outlet of nitrogen making machine；
Described effusion meter is connected with controller, and for detecting the gas output of the gas outlet of nitrogen making machine, and gas output detected value detection obtained is sent to controller；
Controller is additionally operable to, when the oxygen concentration detected value judged in air conditioned store is more than the oxygen concentration threshold value preset, by gas output detected value compared with the metered flow value that nitrogen making machine is current, and control the connecting degree of circulation valve group and extraneous air according to comparative result；Wherein, if the former is less than the latter, then controls circulation valve group and connect with extraneous air, or, control circulation valve group and increase the degree connected with extraneous air, enter circulation line with supplementary extraneous air；If the former is more than the latter, then controls circulation valve group and reduce the degree connected with extraneous air.
5. control system as claimed in claim 4, it is characterized in that, described controller specifically for, calculate the difference between tolerance detected value and the nitrogen making machine metered flow value under current operating state, and calculate the ratio between described difference and the nitrogen making machine metered flow value under current operating state；And, when judge gas output detected value less than nitrogen making machine at current operating state under metered flow value time, according to this ratio, increase the degree that circulation valve group connects with extraneous air；When judge gas output detected value more than nitrogen making machine at current operating state under metered flow value time, according to this ratio, reduce the degree that circulation valve group connects with extraneous air.
6. control system as claimed in claim 3, it is characterised in that controller specifically for, when the oxygen concentration detected value judged in air conditioned store is less than or equal to the oxygen concentration threshold value preset, controls nitrogen making machine and quit work.
7. the control system as described in any one of claim 1-6, it is characterised in that this system also includes temperature controlling machine, the first temperature measurer and the second temperature measurer；Temperature difference threshold Δ t it is additionally provided with in described controller；
Described temperature controlling machine is connected with the gas outlet of nitrogen making machine, for regulating the temperature of the gas outlet expellant gas of nitrogen making machine；
Described first temperature measurer is arranged in air conditioned store, and is connected with controller, is sent to controller for the temperature detection value t1 detected in the temperature in air conditioned store, and the air conditioned store that will detect；
Described second temperature measurer is arranged at the outlet of temperature controlling machine, and is connected with controller, for the temperature of detection gas after temperature controlling machine homoiothermic, and the temperature detection value t2 detected is sent to controller；
Described controller is additionally operable to, calculate the difference between t1 and t2, and judge that this difference is whether within the scope of default temperature difference threshold Δ t, if not existing, then send temperature regulation signal to temperature controlling machine, to indicate temperature controlling machine to regulate the temperature of the gas outlet expellant gas of nitrogen making machine to (t1 ± Δ t)；Wherein, if t1 is ＞ t2, then the temperature of the gas outlet expellant gas of nitrogen making machine is regulated to (temperature of the gas outlet expellant gas of nitrogen making machine if t1 is ＜ t2, is then regulated to (t1+ Δ t) by t1-Δ t).
8. a nitrogen controlled atmosphere control method, in nitrogen controlled atmosphere control system, the method includes that initial gas adjusts rate-determining steps and operating controlled atmosphere rate-determining steps, it is characterised in that described operating controlled atmosphere rate-determining steps includes:
The gas outlet expellant gas of air conditioned store is delivered in the air inlet of the air compressor in nitrogen controlled atmosphere control system；
Described initial gas adjusts rate-determining steps to include: controls extraneous air and enters in air compressor, and starts timing, and controls to open nitrogen making machine；When default air inlet duration arrives, control air compressor and completely cut off with extraneous air.
9. method as claimed in claim 8, it is characterised in that described operating controlled atmosphere rate-determining steps also includes:
Detect the oxygen concentration in air conditioned store, and the oxygen concentration detected value in air conditioned store detection obtained compares with the oxygen concentration threshold value preset, and controls the start and stop of nitrogen making machine further according to comparative result；Wherein, if the former is less than or equal to the latter, then controls nitrogen making machine and quit work；If the former is more than the latter, then controls nitrogen making machine and work on.
10. method as claimed in claim 9, it is characterised in that described operating controlled atmosphere rate-determining steps also includes:
The gas output of the gas outlet of nitrogen making machine is detected when nitrogen making machine runs, and when the oxygen concentration detected value judged in air conditioned store is more than the oxygen concentration threshold value preset, gas output detected value detection obtained is compared with the metered flow value that nitrogen making machine is current, and controls the air inflow of extraneous air entrance nitrogen controlled atmosphere control system according to comparative result；Wherein, if the former is less than the latter, then increases extraneous air and enter the air inflow of nitrogen controlled atmosphere control system；If the former is more than the latter, then reduces extraneous air and enter the air inflow of nitrogen controlled atmosphere control system；
And,
Described operating controlled atmosphere rate-determining steps also includes that homoiothermic step, described homoiothermic step include:
Temperature in detection air conditioned store, obtains temperature detection value t1, and the temperature of the gas that detection is after homoiothermic, obtains temperature detection value t2；
Calculate the difference between t1 and t2, and judge that this difference, whether within the scope of default temperature difference threshold Δ t, if not existing, then carries out temperature regulation, in order to by gas temperature regulation to (t1 ± Δ t)；Wherein, if t1 is ＞ t2, then by gas temperature regulation to (t1-Δ t), if t1 is ＜ t2, then by gas temperature regulation to (t1+ Δ t).
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| CN106594519A (en) * | 2016-12-26 | 2017-04-26 | 山东宏润空压机科技有限公司 | Nitrogen continuous supply device and control method thereof |
| CN107608262B (en) * | 2017-09-05 | 2020-10-09 | 无锡吉兴汽车声学部件科技有限公司 | Intelligent control system for concentration of automobile exhaust in laboratory |
| CN108181942A (en) * | 2017-12-13 | 2018-06-19 | 中国航空工业集团公司上海航空测控技术研究所 | A kind of airborne equipment of making nitrogen control device and method |
| CN110874106B (en) * | 2018-08-31 | 2022-09-02 | 伊利诺斯工具制品有限公司 | Gas control system and method for reflow oven |
| CN110694872A (en) * | 2019-11-14 | 2020-01-17 | 中山易必固新材料科技有限公司 | Gas protection device and inflation system for ultraviolet curing of plate |
| CN115067387A (en) * | 2022-07-21 | 2022-09-20 | 杭州辰睿空分设备制造有限公司 | Remote intelligent control system of nitrogen production system |
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