CN112648709A - Automatic oxygen concentration maintaining and controlling device for closed space - Google Patents
Automatic oxygen concentration maintaining and controlling device for closed space Download PDFInfo
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- CN112648709A CN112648709A CN202011397606.5A CN202011397606A CN112648709A CN 112648709 A CN112648709 A CN 112648709A CN 202011397606 A CN202011397606 A CN 202011397606A CN 112648709 A CN112648709 A CN 112648709A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/76—Oxygen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The invention discloses an automatic oxygen concentration maintaining and controlling device for a closed space, which comprises three components, namely a bubble sensor, a bubble detector and an electrolytic oxygen generator; the electrolytic oxygen generator generates oxygen by utilizing an electrolytic oxygen generation principle, the bubble sensor senses the bubble diameter of the oxygen generated in the electrolytic oxygen generator and transmits a bubble signal to the bubble detector, and the bubble signal comprises the bubble diameter and the number; the bubble detector collects bubble signals of the bubble sensor, analyzes and processes the bubble signals, calculates the accumulated volume and the oxygen production amount of the generated oxygen bubbles in a fixed period according to a preset algorithm, calculates the corresponding oxygen concentration by combining the volume of the closed space, compares the calculated oxygen concentration with a preset oxygen concentration range, and generates a control signal to control the oxygen production working state of the electrolytic oxygen generator. The technical scheme provided by the embodiment of the invention solves the problems of continuous supply and concentration maintenance of oxygen in the closed space.
Description
The technical field is as follows:
the present invention relates to, but not limited to, the field of signal processing technology and automatic control technology, and particularly to an automatic oxygen concentration maintaining and controlling device for an enclosed space.
Background art:
in the development and development of closed spaces such as aircraft cockpit, submarine, space station and the like, the oxygen supply technology is a key technology, normal human body needs oxygen with a certain concentration, and the oxygen with too low or too high concentration is harmful to the human body and threatens the life safety of people. The traditional oxygen supply mode is oxygen cylinder oxygen supply, and the oxygen supply amount is limited, so that the requirement of long-time continuous oxygen supply cannot be met. The electrolytic oxygen production technology is the most reasonable oxygen supply technology for the closed space at present.
The prior published documents are mostly directed to the description of an oxygen production method, and the oxygen concentration monitoring and maintaining control method is rarely involved, and the method is crucial to the continuous and proper supply of oxygen and the life safety of pilots or astronauts.
The invention content is as follows:
the purpose of the invention is: the embodiment of the invention provides an automatic oxygen concentration maintaining and controlling device for a closed space, which aims to solve the problems of continuous supply and concentration maintaining of oxygen in the closed space.
The technical scheme of the invention is as follows:
the embodiment of the invention provides an automatic oxygen concentration maintaining and controlling device for a closed space, which comprises: a bubble sensor, a bubble detector and an electrolytic oxygen generator;
the electrolytic oxygen generator is used for generating oxygen in an electrolytic oxygen generation mode and conveying the generated oxygen to the bubble sensor;
the bubble sensor is used for sensing the bubble diameter of oxygen generated in the electrolytic oxygen generation equipment and transmitting a bubble signal to the bubble detector, wherein the bubble signal comprises the bubble diameter and the number;
the bubble detector is used for collecting bubble signals transmitted by the bubble sensor, analyzing and processing the bubble signals, calculating the accumulated volume and the oxygen production amount of oxygen bubbles generated in a fixed period according to a preset algorithm, calculating corresponding oxygen concentration by combining the volume of the closed space, comparing the calculated oxygen concentration with a preset oxygen concentration range, and generating a control signal to control the oxygen production working state of the electrolytic oxygen generator.
Alternatively, in the apparatus for automatically maintaining an oxygen concentration in an enclosed space as described above, the bubble detector includes: the oxygen generation system comprises a bubble signal processing unit, an oxygen concentration monitoring unit and an electrolytic oxygen generation enabling control unit;
the bubble signal processing unit is used for carrying out analog-to-digital conversion through signal conditioning according to bubble signals transmitted by the bubble sensor, caching a bubble digital signal of an analysis period, carrying out data operation and calculating the cumulative volume and oxygen production amount of oxygen bubbles;
the oxygen concentration monitoring unit is used for estimating the oxygen concentration of the current closed space according to the oxygen production amount and the oxygen consumption amount which are calculated, comparing the calculated oxygen concentration serving as an observed amount with a preset oxygen concentration range, and using a comparison difference value as the input of the electrolytic oxygen production enabling control unit;
and the electrolytic oxygen generation enabling control unit is used for generating a switching value control signal according to the comparison difference value so as to control the oxygen generation working state of the electrolytic oxygen generator to be opened or closed.
Alternatively, in the automatic oxygen concentration maintaining control device for an enclosed space as described above, the bubble signal processing unit may calculate the cumulative volume of oxygen bubbles generated in one analysis period as vAir bubbleAnd the oxygen production amount is z ═ rho vAir bubbleWherein ρ represents an oxygen density under normal temperature and pressure conditions;
the accumulated volume v of the oxygen bubbles generated by the electrolytic oxygen generator in one analysis periodAir bubbleIs the sum of the columnar gas volume v1, the irregular bubble volume v2, and the single bubble volume v3, i.e.:
vair bubble＝v1+v2+v3。
Alternatively, in the automatic oxygen concentration maintaining and controlling apparatus for an enclosed space as described above,
when the amplitude of the acquired bubble signal is greater than or equal to the threshold value T1 of the full gas state, the generated oxygen bubbles are columnar gas, and the bubble signal processing unit obtains the volume of the columnar gas by counting the number n of the oxygen bubbles of which the amplitude of the acquired signal is greater than or equal to T1 in the analysis period:
v1 ═ V _ lg ═ n ═ pi × (r)/f, where V _ lg is the gas flow rate, r is the radius of the gas transport line, f is the sampling frequency of the analog-to-digital conversion, and pi is a constant.
Alternatively, in the automatic oxygen concentration maintaining and controlling apparatus for an enclosed space as described above,
when the amplitude of the acquired bubble signal is smaller than T1 and is larger than or equal to the peak threshold value T2 of the pulse signal corresponding to a single bubble, the generated oxygen bubbles are irregular bubbles, the irregular bubbles are approximated to spherical bubbles with the inner diameter of the gas transmission pipeline as the diameter, the pulse peak values of the approximated spherical bubbles are detected, when the peak value A [ T ] of the bubble signal acquired at one moment is larger than the peak values of the bubble signal acquired at the previous moment and the next moment, the count value p of the number of the bubbles is increased by one, the number p of the irregular bubbles in the analysis period is counted, and the volume of the irregular bubbles is obtained:
v2＝4*π*r3*p/3。
alternatively, in the automatic oxygen concentration maintaining and controlling apparatus for an enclosed space as described above,
when the amplitude of the acquired bubble signal is smaller than T2 and is larger than or equal to a threshold value T3 of a full water state, the generated oxygen bubbles are single small bubbles, the pulse peak value of the single small bubbles is detected, when the peak value A [ T ] of the bubble signal acquired at one moment is larger than the peak values of the bubble signal acquired at the previous moment and the next moment, the peak value of the pulse signal at the moment is recorded, and the single bubble volume v 3' at the moment is obtained through a polynomial fitting formula of the single bubble volume and the single bubble pulse signal peak value; the cumulative sum of the single bubble volumes v 3' over the analysis period is denoted as v 3.
Alternatively, in the automatic oxygen concentration maintaining and controlling apparatus for an enclosed space as described above,
the oxygen concentration monitoring unit calculates the oxygen concentration of the current closed space according to the oxygen consumption X and the oxygen production Z in one analysis period as follows:
wherein, CCRepresenting the current oxygen concentration, C, in the enclosed space0Representing the initial oxygen concentration, V, in the enclosed spaceSpace(s)Represents the volume of the closed space, X represents the oxygen consumption in the analysis period, and Z represents the oxygen production in the analysis period.
Alternatively, in the automatic oxygen concentration maintaining and controlling apparatus for an enclosed space as described above,
the preset oxygen concentration range comprises: lower limit of suitable oxygen concentration CLower partAnd an upper limit of suitable oxygen concentration COn the upper partTwo constants;
the electrolysis oxygen generation enabling control unit enables the current oxygen concentration CCAnd the lower limit C of the preset oxygen concentration rangeLower partAnd upper limit COn the upper partComparing and processing according to a preset mechanism, wherein the processing mode comprises the following steps:
if CCLess than or equal to CLower partThe electrolytic oxygen generation enable control unit outputs a high-level enable signal to control the electrolytic oxygen generator to work to generate oxygen;
if CCGreater than CLower partAnd CCLess than COn the upper partOr CCGreater than or equal to COn the upper partWhen the electrolytic oxygen generation enabling control unit outputs a low-level forbidding signal, the electrolytic oxygen generator does not work;
if CCGreater than COn the upper partAnd outputting a fault alarm signal when the fixed time length T is exceeded.
The invention has the advantages that:
the automatic oxygen concentration maintaining and controlling device for the closed space, provided by the embodiment of the invention, adopts an electrolytic oxygen generator to generate oxygen, and senses the bubble diameter of the generated oxygen in an electrolytic oxygen generating device through a bubble sensor, a bubble detector collects bubble signals transmitted by the bubble sensor, analyzes and processes the bubble signals, calculates the accumulated volume and the oxygen generation amount of the generated oxygen bubbles in a fixed period according to a preset algorithm, calculates the corresponding oxygen concentration by combining the volume of the closed space, compares the calculated oxygen concentration with a preset oxygen concentration range, and generates a control signal to control the oxygen generation working state of the electrolytic oxygen generator. The technical scheme of the embodiment of the invention fully utilizes the signal processing technology and the automatic control technology to realize the real-time monitoring of the oxygen concentration in the closed space and control the oxygen concentration to be kept in a set value or range; the oxygen supply is realized continuously without the limit of the number of personnel and the volume of a closed space.
Description of the drawings:
the accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an automatic oxygen concentration maintaining and controlling device for an enclosed space according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal processing process of a bubble signal processing unit in the automatic oxygen concentration maintaining and controlling device for an enclosed space according to an embodiment of the present invention;
fig. 3 is a flowchart of the bubble accumulation volume calculation performed by the bubble signal processing unit according to the embodiment of the present invention.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Regarding the automatic oxygen supply method, an automatic oxygen supply system and a control method are disclosed in the patent "automatic oxygen supply system and control method" (application No. 201510599353.2, publication No. 105115110a) applied by guangzhou jintian unicin manufacturing of purification plant, ltd. However, this method is a method for monitoring and controlling the oxygen concentration in a space communicating with the air, and is not suitable for controlling the supply and concentration maintenance of oxygen in a closed space.
Therefore, there is a need to provide an automatic oxygen concentration maintaining and controlling device for an enclosed space to achieve the purpose of controlling the oxygen concentration in the enclosed space.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of an automatic oxygen concentration maintaining and controlling device for an enclosed space according to an embodiment of the present invention. The automatic oxygen concentration maintaining and controlling device for the closed space provided by the embodiment of the invention can comprise three components, namely a bubble sensor, a bubble detector and an electrolytic oxygen generator.
In the structure of the oxygen concentration automatic maintaining control device, as shown in the figure, an electrolytic oxygen generator generates oxygen by using an electrolytic oxygen generation mode and conveys the generated oxygen to a bubble sensor, the bubble sensor senses the bubble diameter of the oxygen generated in the electrolytic oxygen generator and transmits a bubble signal to a bubble detector, and the bubble signal comprises the bubble diameter and the number; the bubble detector collects bubble signals of the bubble sensor, analyzes and processes the bubble signals, calculates the accumulated volume and the oxygen production amount of oxygen bubbles generated in a fixed period according to a preset algorithm, calculates corresponding oxygen concentration by combining the volume of the closed space, and compares the calculated oxygen concentration with the preset oxygen concentration, so that a control signal is generated to control the oxygen production working state of the electrolytic oxygen generator, and finally the purpose of controlling the oxygen concentration of the closed space is achieved.
In the automatic oxygen concentration maintaining and controlling device provided by the embodiment of the invention, the bubble detector is the core part of the device, the bubble sensor and the electrolytic oxygen generator can be realized by adopting equipment in the prior art, the bubble sensor is arranged in the electrolytic oxygen generator, and is used for sensing bubble signals generated by the electrolytic oxygen generator in real time and converting the bubble diameter information into electric signals.
In one implementation manner of the embodiment of the present invention, as shown in fig. 1, the bubble detector in the embodiment of the present invention may include: the device comprises three functional units, namely a bubble signal processing unit, an oxygen concentration monitoring unit and an electrolytic oxygen generation enabling control unit.
As shown in fig. 1, fig. 2 is a schematic diagram of a signal processing process of a bubble signal processing unit in an automatic oxygen concentration maintaining and controlling device for an enclosed space according to an embodiment of the present invention. The bubble signal processing unit processes analog-to-digital conversion by signal conditioning according to bubble signals (such as bubble diameter electrical signals) transmitted by the bubble sensor, caches bubble digital signals of an analysis period and performs data operation to calculate the cumulative volume and oxygen production of oxygen bubbles; the oxygen concentration monitoring unit estimates the oxygen concentration of the current closed space according to the detected oxygen production amount and oxygen consumption (for example, in the closed space and in the occasion that passengers are fixed, the oxygen consumption in a certain time is a relative constant); and comparing the calculated oxygen concentration serving as an observed quantity with a preset oxygen concentration range, and using a comparison difference value as the input of an electrolytic oxygen generation enabling control unit.
For example, since the amount of oxygen consumed in a certain period of time is relatively constant when the occupant is stationary in a closed space, the calculated oxygen concentration can be used as the observed amount and the oxygen concentration range suitable for the human body (including the lower limit C of the suitable oxygen concentration)Lower partAnd an upper limit of suitable oxygen concentration COn the upper partTwo constants) and the difference value is used as the input of the electrolytic oxygen generation enabling control unit. The electrolytic oxygen generation enabling control unit generates a switching value control signal according to the comparison difference value so as to control the oxygen generation working state of the electrolytic oxygen generator to be on or off. For example, the electrolysis reaction of an electrolytic oxygen generator can be controlled to control the amount of oxygen produced.
The specific implementation manner of each component of the bubble detector in the embodiment of the invention is described as follows:
1) the bubble signal processing unit: the signal processing process is as shown in fig. 2, and the bubble signal (for example, the bubble diameter voltage signal) detected by the bubble sensor enters the analog-to-digital converter after being signal-conditionedThe converter (ADC) converts the analog signal into a digital signal, and the bubble signal can be in a range of 0-5V; the processing unit buffers data of one analysis period (usually 1s or 2s), and performs data processing to calculate the cumulative volume v of the generated oxygen bubbles in one analysis periodAir bubbleAnd the oxygen production amount z ═ rho vAir bubbleAnd ρ represents the oxygen density under normal temperature and pressure conditions.
It should be noted that the volume v of the bubbles generated by the electrolytic oxygen generatorAir bubbleConsists of a columnar gas volume v1, an irregular bubble volume v2 and a single bubble volume v3, namely, the cumulative volume v of oxygen bubbles generated by the electrolytic oxygen generator in one analysis periodAir bubbleIs the sum of the columnar gas volume v1, the irregular bubble volume v2, and the single bubble volume v3, i.e.:
vair bubble＝v1+v2+v3。
In the embodiment of the present invention, the resolution modes of the columnar gas, the irregular bubbles and the single bubbles may be:
when the amplitude A [ N ] of the acquired bubble signal is greater than or equal to the threshold value T1 of the full gas state, the generated oxygen bubbles are columnar gas, under the condition, the bubble signal processing unit obtains the volume of the columnar gas by counting the number N of the oxygen bubbles with the signal amplitude greater than or equal to T1 in the analysis period:
v1 ═ V _ lg ═ n ═ pi × (r)/f, where V _ lg is the liquid flow rate, r is the radius of the gas transport line, f is the sampling frequency of the analog-to-digital conversion, and pi is a constant.
When the amplitude A [ N ] of the acquired bubble signal is smaller than T1 and is larger than or equal to the peak threshold value T2 of the pulse signal corresponding to a single bubble, the generated oxygen bubbles are irregular bubbles, the irregular bubbles are approximately spherical bubbles with the inner diameter of a gas transmission pipeline as the diameter, the pulse peak value of the approximate spherical bubbles is detected, when the peak value A [ T ] of the bubble signal acquired at a certain moment is larger than the peak values of the acquired signals at the previous moment and the next moment, the count value p of the number of the bubbles is added by one, the number p of the irregular bubbles in a period of statistical analysis is counted, and the volume of the irregular bubbles is obtained as follows:
v2＝4*π*r3*p/3；
when the amplitude A [ N ] of the acquired bubble signal is smaller than T2 and is larger than or equal to a threshold value T3 of a full water state, the generated oxygen bubbles into a single small bubble, the pulse peak value of the single small bubble is detected, when the peak value A [ T ] of the bubble signal acquired at a certain moment is larger than the peak values of the bubble signal acquired at the previous moment and the next moment, the peak value of the pulse signal at the moment is recorded, and the single bubble volume v 3' at the moment is obtained through a polynomial fitting formula of the single bubble volume and the single bubble pulse signal peak value; the cumulative sum of the bubble volumes at all pulse peak points during an analysis cycle is v 3.
Fig. 3 is a flowchart showing the bubble accumulation volume calculation performed by the bubble signal processing unit according to the embodiment of the present invention.
2) And an oxygen concentration monitoring unit: according to the oxygen consumption X (in the closed space, the situation that passengers are fixed, the oxygen consumption in a certain time is a relative constant) and the oxygen production Z in one analysis period, the oxygen concentration of the current closed space is calculated as follows:
in the formula, CCRepresenting the current oxygen concentration, C, in the enclosed space0Representing the initial oxygen concentration, V, in the enclosed spaceSpace(s)Represents the volume of the closed space, X represents the oxygen consumption in one analysis period, and Z represents the oxygen production in one analysis period.
3) And an electrolytic oxygen generation enabling control unit: the current oxygen concentration CCLower limit of oxygen concentration suitable for human body CLower partAnd an upper limit of suitable oxygen concentration COn the upper partThe comparison is performed and the processing is performed according to the following mechanism:
if CCLess than or equal to CLower partThe electrolytic oxygen generation enable control unit outputs a high-level enable signal to control the electrolytic oxygen generator to work to generate oxygen;
if Cc is greater than CLower partAnd CCLess than COn the upper partOr CCGreater than or equal to COn the upper partWhen the electrolytic oxygen generation enabling control unit outputs a low-level forbidding signal, the electrolytic oxygen generator does not work;
if Cc is greater than COn the upper partAnd outputting a fault alarm signal when the fixed time length T is exceeded.
The automatic oxygen concentration maintaining control device for the closed space provided by the embodiment of the invention adopts the electrolytic oxygen generator to generate oxygen, the bubble diameter of the oxygen generated in the electrolytic oxygen generating equipment is sensed by the bubble sensor, the bubble signal transmitted by the bubble sensor is collected by the bubble detector, the analysis and the processing are carried out, the accumulated volume and the oxygen generation amount of the generated oxygen bubbles in a fixed period are calculated according to a preset algorithm, the corresponding oxygen concentration is calculated by combining the volume of the closed space, the calculated oxygen concentration is compared with the preset oxygen concentration range, and a control signal is generated to control the oxygen generation working state of the electrolytic oxygen generator. The technical scheme of the embodiment of the invention fully utilizes the signal processing technology and the automatic control technology to realize the real-time monitoring of the oxygen concentration in the closed space and control the oxygen concentration to be kept in a set value or range; the oxygen supply is realized continuously without the limit of the number of personnel and the volume of a closed space.
The following describes an embodiment of an automatic oxygen concentration maintaining and controlling device for an enclosed space according to an embodiment of the present invention with reference to a specific implementation example.
The processor adopts FT-C6701V DSP, the analog-to-digital converter adopts AD976A chip of ADI company, and the bubble sensor adopts XXXBA007 of Middle 48 institute.
Acquiring bubble diameter electric signals by a bubble sensor, conditioning the signals, performing analog-to-digital conversion by an AD976A analog-to-digital converter, reading and caching digital information of bubble diameters in a period of 2 seconds by FT-C6701V, and calculating the bubble volume v according to the bubble accumulation volume calculation flow shown in figure 3Air bubbleAnd oxygen production Z, wherein the inner diameter of the tube wall is 4mm, the sampling frequency f is 1k, T3 is 0.6V, T2 is 3.1V, T1 is 4.4V, V _ lg is 0.036, Z1 is-0.33, Z2 is 1.94, and Z3 is 1.20; calculating the oxygen consumption X of the testers in the closed space within 2 seconds, and estimating the oxygen concentration of the current closed space as follows:
c is to beCAs observed quantity and lower limit of suitable oxygen concentration CLower partAnd an upper limit of suitable oxygen concentration COn the upper partComparison was made (setting the lower limit C for the optimum oxygen concentrationLower part20.5%, the upper limit of suitable oxygen concentration COn the upper part21.5%) and processed according to the following mechanism: if CCLess than or equal to CLower partThe electrolytic oxygen generation enable control unit outputs a high-level enable signal to control the electrolytic oxygen generator to work to generate oxygen; if Cc is greater than CLower partAnd CCLess than COn the upper partWhen the electrolytic oxygen generation enabling control unit outputs a low-level forbidding signal, the electrolytic oxygen generator does not work; if Cc is greater than or equal to COn the upper partWhen the electrolytic oxygen generation enabling control unit outputs a low-level forbidding signal, the electrolytic oxygen generator stops generating oxygen; if Cc is greater than COn the upper partAnd outputting a fault alarm signal when the fixed time length T is exceeded.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An automatic oxygen concentration maintaining control device for a closed space is characterized by comprising: a bubble sensor, a bubble detector and an electrolytic oxygen generator;
the electrolytic oxygen generator is used for generating oxygen in an electrolytic oxygen generation mode and conveying the generated oxygen to the bubble sensor;
the bubble sensor is used for sensing the bubble diameter of oxygen generated in the electrolytic oxygen generation equipment and transmitting a bubble signal to the bubble detector, wherein the bubble signal comprises the bubble diameter and the number;
the bubble detector is used for collecting bubble signals transmitted by the bubble sensor, analyzing and processing the bubble signals, calculating the accumulated volume and the oxygen production amount of oxygen bubbles generated in a fixed period according to a preset algorithm, calculating corresponding oxygen concentration by combining the volume of the closed space, comparing the calculated oxygen concentration with a preset oxygen concentration range, and generating a control signal to control the oxygen production working state of the electrolytic oxygen generator.
2. The apparatus for automatically maintaining and controlling oxygen concentration in an enclosed space according to claim 1, wherein the bubble detector comprises: the oxygen generation system comprises a bubble signal processing unit, an oxygen concentration monitoring unit and an electrolytic oxygen generation enabling control unit;
the bubble signal processing unit is used for carrying out analog-to-digital conversion through signal conditioning according to bubble signals transmitted by the bubble sensor, caching a bubble digital signal of an analysis period, carrying out data operation and calculating the cumulative volume and oxygen production amount of oxygen bubbles;
the oxygen concentration monitoring unit is used for estimating the oxygen concentration of the current closed space according to the oxygen production amount and the oxygen consumption amount which are calculated, comparing the calculated oxygen concentration serving as an observed amount with a preset oxygen concentration range, and using a comparison difference value as the input of the electrolytic oxygen production enabling control unit;
and the electrolytic oxygen generation enabling control unit is used for generating a switching value control signal according to the comparison difference value so as to control the oxygen generation working state of the electrolytic oxygen generator to be opened or closed.
3. The apparatus for automatically maintaining and controlling the oxygen concentration in an enclosed space according to claim 2, wherein the cumulative volume of the oxygen bubbles generated in one analysis period solved by the bubble signal processing unit is vAir bubbleAnd the oxygen production amount is z ═ rho vAir bubbleWherein ρ represents an oxygen density under normal temperature and pressure conditions;
the electrolytic oxygen generator is used in one analysis periodCumulative volume v of oxygen bubbles generated thereinAir bubbleIs the sum of the columnar gas volume v1, the irregular bubble volume v2, and the single bubble volume v3, i.e.:
vair bubble＝v1+v2+v3。
4. The automatic oxygen concentration maintaining and controlling device for an enclosed space according to claim 3,
when the amplitude of the acquired bubble signal is greater than or equal to the threshold value T1 of the full gas state, the generated oxygen bubbles are columnar gas, and the bubble signal processing unit obtains the volume of the columnar gas by counting the number n of the oxygen bubbles of which the amplitude of the acquired signal is greater than or equal to T1 in the analysis period:
v1 ═ V _ lg ═ n ═ pi × (r)/f, where V _ lg is the gas flow rate, r is the radius of the gas transport line, f is the sampling frequency of the analog-to-digital conversion, and pi is a constant.
5. The automatic oxygen concentration maintaining and controlling device for an enclosed space according to claim 3,
when the amplitude of the acquired bubble signal is smaller than T1 and is larger than or equal to the peak threshold value T2 of the pulse signal corresponding to a single bubble, the generated oxygen bubbles are irregular bubbles, the irregular bubbles are approximated to spherical bubbles with the inner diameter of the gas transmission pipeline as the diameter, the pulse peak values of the approximated spherical bubbles are detected, when the peak value A [ T ] of the bubble signal acquired at one moment is larger than the peak values of the bubble signal acquired at the previous moment and the next moment, the count value p of the number of the bubbles is increased by one, the number p of the irregular bubbles in the analysis period is counted, and the volume of the irregular bubbles is obtained:
v2＝4*π*r3*p/3。
6. the automatic oxygen concentration maintaining and controlling device for an enclosed space according to claim 3,
when the amplitude of the acquired bubble signal is smaller than T2 and is larger than or equal to a threshold value T3 of a full water state, the generated oxygen bubbles are single small bubbles, the pulse peak value of the single small bubbles is detected, when the peak value A [ T ] of the bubble signal acquired at one moment is larger than the peak values of the bubble signal acquired at the previous moment and the next moment, the peak value of the pulse signal at the moment is recorded, and the single bubble volume v 3' at the moment is obtained through a polynomial fitting formula of the single bubble volume and the single bubble pulse signal peak value; the cumulative sum of the single bubble volumes v 3' over the analysis period is denoted as v 3.
7. The automatic oxygen concentration maintaining and controlling device for the enclosed space according to any one of claims 2 to 6,
the oxygen concentration monitoring unit calculates the oxygen concentration of the current closed space according to the oxygen consumption X and the oxygen production Z in one analysis period as follows:
wherein, CCRepresenting the current oxygen concentration, C, in the enclosed space0Representing the initial oxygen concentration, V, in the enclosed spaceSpace(s)Represents the volume of the closed space, X represents the oxygen consumption in the analysis period, and Z represents the oxygen production in the analysis period.
8. The automatic oxygen concentration maintaining and controlling device for the enclosed space according to any one of claims 2 to 6,
the preset oxygen concentration range includes: lower limit of suitable oxygen concentration CLower partAnd an upper limit of suitable oxygen concentration COn the upper partTwo constants;
the electrolysis oxygen generation enabling control unit enables the current oxygen concentration CCAnd the lower limit C of the preset oxygen concentration rangeLower partAnd upper limit COn the upper partComparing and processing according to a preset mechanism, wherein the processing mode comprises the following steps:
if CCLess than or equal to CLower partThe electrolytic oxygen generation enable control unit outputs a high-level enable signal to control the electrolytic oxygen generatorOxygen is generated during working;
if CCGreater than CLower partAnd CCLess than COn the upper partOr CCGreater than or equal to COn the upper partWhen the electrolytic oxygen generation enabling control unit outputs a low-level forbidding signal, the electrolytic oxygen generator does not work;
if CCGreater than COn the upper partAnd outputting a fault alarm signal when the fixed time length T is exceeded.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981466A (en) * | 2021-09-14 | 2022-01-28 | 广东卡沃罗氢科技有限公司 | Closed space hydrogen concentration monitoring and automatic adjusting method, device and system |
| CN114326528A (en) * | 2021-12-31 | 2022-04-12 | 成都康拓兴业科技有限责任公司 | Control method of onboard oxygen concentrator |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7347944B2 (en) * | 2005-06-03 | 2008-03-25 | BAGLEY David | Method for making and conditioning super-oxygenated and structured water |
| CN101365514A (en) * | 2006-10-19 | 2009-02-11 | 艾摩罗那股份公司 | Method for determining the air tightness of enclosed spaces |
| CN103471502A (en) * | 2013-08-22 | 2013-12-25 | 中国电子科技集团公司第四十八研究所 | Device and method for detecting volume of gas-liquid two-phase flow bubbles |
| CN104045060A (en) * | 2014-06-03 | 2014-09-17 | 中物功能材料研究院有限公司 | Automatic control oxygen generator |
| CN104657573A (en) * | 2014-01-06 | 2015-05-27 | 北京千安哲信息技术有限公司 | Leaking gas diffusion forecasting method used for three-dimensional space |
| CN104895686A (en) * | 2015-05-07 | 2015-09-09 | 潍柴动力股份有限公司 | Method and system for determining oxygen concentration of exhaust gas of engine |
| CN105354923A (en) * | 2015-10-30 | 2016-02-24 | 珠海优特电力科技股份有限公司 | Hotel oxygen charging method and system |
| CN205227620U (en) * | 2015-10-30 | 2016-05-11 | 珠海优特电力科技股份有限公司 | Oxygen system |
| CN208187893U (en) * | 2018-05-24 | 2018-12-04 | 中国地质大学（北京） | For measuring gas absorption-diffusion-displacement experimental system |
| CN108954718A (en) * | 2018-08-06 | 2018-12-07 | 深圳明创自控技术有限公司 | The exceeded early warning system of concentration of toxic gases |
| CN110407176A (en) * | 2018-04-28 | 2019-11-05 | 深圳市美好创亿医疗科技有限公司 | Obtain the oxygenerator and method for producing oxygen through of high oxygen concentration processed |
-
2020
- 2020-12-04 CN CN202011397606.5A patent/CN112648709A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7347944B2 (en) * | 2005-06-03 | 2008-03-25 | BAGLEY David | Method for making and conditioning super-oxygenated and structured water |
| CN101365514A (en) * | 2006-10-19 | 2009-02-11 | 艾摩罗那股份公司 | Method for determining the air tightness of enclosed spaces |
| CN103471502A (en) * | 2013-08-22 | 2013-12-25 | 中国电子科技集团公司第四十八研究所 | Device and method for detecting volume of gas-liquid two-phase flow bubbles |
| CN104657573A (en) * | 2014-01-06 | 2015-05-27 | 北京千安哲信息技术有限公司 | Leaking gas diffusion forecasting method used for three-dimensional space |
| CN104045060A (en) * | 2014-06-03 | 2014-09-17 | 中物功能材料研究院有限公司 | Automatic control oxygen generator |
| CN104895686A (en) * | 2015-05-07 | 2015-09-09 | 潍柴动力股份有限公司 | Method and system for determining oxygen concentration of exhaust gas of engine |
| CN105354923A (en) * | 2015-10-30 | 2016-02-24 | 珠海优特电力科技股份有限公司 | Hotel oxygen charging method and system |
| CN205227620U (en) * | 2015-10-30 | 2016-05-11 | 珠海优特电力科技股份有限公司 | Oxygen system |
| CN110407176A (en) * | 2018-04-28 | 2019-11-05 | 深圳市美好创亿医疗科技有限公司 | Obtain the oxygenerator and method for producing oxygen through of high oxygen concentration processed |
| CN208187893U (en) * | 2018-05-24 | 2018-12-04 | 中国地质大学（北京） | For measuring gas absorption-diffusion-displacement experimental system |
| CN108954718A (en) * | 2018-08-06 | 2018-12-07 | 深圳明创自控技术有限公司 | The exceeded early warning system of concentration of toxic gases |
Non-Patent Citations (2)
| Title |
|---|
| 刘应平、缪国平: "《高等流体力学》", 30 June 2000 * |
| 崔引安: "《农业生物环境工程》", 31 October 1994 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981466A (en) * | 2021-09-14 | 2022-01-28 | 广东卡沃罗氢科技有限公司 | Closed space hydrogen concentration monitoring and automatic adjusting method, device and system |
| CN114326528A (en) * | 2021-12-31 | 2022-04-12 | 成都康拓兴业科技有限责任公司 | Control method of onboard oxygen concentrator |
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