CN116146900A - Pressure stabilizing gas circuit structure and flow adjusting method - Google Patents

Pressure stabilizing gas circuit structure and flow adjusting method Download PDF

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Publication number
CN116146900A
CN116146900A CN202310191278.0A CN202310191278A CN116146900A CN 116146900 A CN116146900 A CN 116146900A CN 202310191278 A CN202310191278 A CN 202310191278A CN 116146900 A CN116146900 A CN 116146900A
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pressure
pressure sensor
molecular
value
oxygen
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蒲友强
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Changai Technology Chengdu Co ltd
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Changai Technology Chengdu Co ltd
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Priority to CN202310191278.0A priority Critical patent/CN116146900A/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/02—Preparation of oxygen
    • C01B13/0229—Purification or separation processes
    • C01B13/0248—Physical processing only
    • C01B13/0259—Physical processing only by adsorption on solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2210/00—Purification or separation of specific gases
    • C01B2210/0001—Separation or purification processing
    • C01B2210/0009—Physical processing
    • C01B2210/0014—Physical processing by adsorption in solids
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2210/00—Purification or separation of specific gases
    • C01B2210/0043—Impurity removed
    • C01B2210/0046—Nitrogen

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)

Abstract

The invention discloses a pressure stabilizing gas circuit structure and a flow regulating method, comprising a nitrogen discharging unit, a molecular tower group, an oxygen storage unit and a flow regulating assembly which are connected in sequence; the molecular tower group comprises a plurality of groups of molecular towers, and a first control valve and a first air resistor are arranged at two ends of each group of molecular towers; the first control valve is connected with the nitrogen discharge unit, the first air resistor is connected with the oxygen storage unit, and a one-way valve and a second air resistor are arranged between the first air resistor and the oxygen storage unit; the flow regulating assembly comprises a first pressure sensor, a third air resistor, a second pressure sensor and a third pressure sensor which are sequentially arranged. The pressure in each molecular tower in the first air resistance and the second air resistance stable molecular tower group is set, the check valve is set to avoid oxygen loss caused by the fact that oxygen in the oxygen storage unit flows back into each molecular tower, and the first pressure sensor, the second pressure sensor and the third pressure sensor are matched to carry out closed-loop dynamic control on the pressure and the flow of oxygen discharged by the oxygen generator, so that the change of gas concentration caused by pressure fluctuation is prevented.

Description

Pressure stabilizing gas circuit structure and flow adjusting method
Technical Field
The invention relates to the technical field of oxygen manufacture, in particular to a pressure stabilizing gas circuit structure and a flow regulating method.
Background
The oxygen production concentration and the oxygen output flow of the PSA oxygenerator are important parameters of the oxygenerator performance, a plurality of molecular sieve towers are generally arranged for nitrogen-oxygen separation of compressed air to generate oxygen in order to improve the oxygenerator oxygen production, then the oxygen separated from the molecular sieve towers is collected into an oxygen storage bin, a pressure reducing valve is arranged at the rear end of the oxygen storage bin, then oxygen with a certain pressure is output, and the nitrogen is discharged after being silenced by a nitrogen-discharging silencer.
The molecular sieve separates oxygen and nitrogen in the compressed air through the physical property of nitrogen adsorption, but the adsorption performance of the molecular sieve is influenced by the pressure of the gas, and the pressure of each molecular sieve tower can change when the compressed air is connected, the nitrogen is discharged or the oxygen is discharged, so that the adsorption performance of the molecular sieve can be influenced due to the fact that the pressure in the molecular sieve tower is too small, the compressed air can be influenced to enter the molecular sieve tower due to the fact that the pressure in the molecular sieve tower is too large, and the load of an air compressor is increased; and in the process of flowing the separated oxygen from the molecular sieve tower into the oxygen storage bin, some loss can occur due to pressure change of the molecular sieve tower. The pressure and the flow of the gas in the pipeline at the rear end of the oxygen storage bin are in a proportional relation in an ideal state, the larger the pressure is, the larger the flow is, the pressure fluctuation problem generally exists in the precision and non-precision mechanical spring type pressure reducing valve on the market, and the fluctuation of the pressure can bring about the increase or decrease of the flow, so that the change of the gas concentration is caused.
Therefore, how to maintain the pressure of each molecular sieve tower in the oxygen production process and reduce the oxygen concentration reduction caused by the increase or decrease of the oxygen output flow caused by the pressure fluctuation becomes a problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a pressure stabilizing gas circuit structure and a flow regulating method, wherein a plurality of groups of molecular towers are arranged, a first control valve and a first air resistor are arranged at two ends of each group of molecular towers, a one-way valve and a second air resistor are arranged between the first air resistor and an oxygen storage unit, the pressure in each molecular tower in the molecular tower group is stabilized by the first air resistor and the second air resistor, the one-way valve is arranged to prevent oxygen in the oxygen storage unit from flowing back into each molecular tower to cause oxygen loss, and a flow regulating assembly is arranged to carry out closed-loop dynamic control on the pressure and the flow of oxygen discharged by an oxygen generator to prevent the change of the gas concentration caused by the fluctuation of the pressure.
The invention is realized by the following technical scheme:
the first aspect of the invention provides a pressure stabilizing gas circuit structure, which comprises a nitrogen discharging unit, a molecular tower group, an oxygen storage unit and a flow regulating assembly which are connected in sequence;
the molecular tower group comprises a plurality of groups of molecular towers, and a first control valve and a first air resistor are arranged at two ends of each group of molecular towers;
the first control valve is connected with the nitrogen discharge unit, the first air resistor is connected with the oxygen storage unit, and a one-way valve and a second air resistor are arranged between the first air resistor and the oxygen storage unit;
the flow regulating assembly comprises a first pressure sensor, a third air resistor, a second pressure sensor and a third pressure sensor which are sequentially arranged.
According to the invention, the plurality of groups of molecular towers are arranged, the first control valves and the first air resistors are arranged at the two ends of each group of molecular towers, the first control valves are arranged to control the nitrogen discharging speed, the air pressure stability during nitrogen discharging is ensured, the air pressure stability in the molecular towers is ensured, the one-way valves and the second air resistors are arranged between the first air resistors and the oxygen storage units, the pressure in each molecular tower group is stabilized through the first air resistors and the second air resistors, the one-way valves are arranged to avoid oxygen loss caused by the fact that oxygen in the oxygen storage units flows back into each molecular tower, and the first pressure sensor, the third air resistors, the second pressure sensor and the third pressure sensor are mutually matched to carry out closed-loop dynamic control on the oxygen outlet pressure and flow of the oxygen generator, so that the change of the gas concentration caused by pressure fluctuation is prevented.
Further, the aperture of the second air resistor is larger than that of the first air resistor.
Further, the oxygen storage unit specifically includes: the first oxygen storage bin, the second control valve and the second oxygen storage bin are sequentially arranged.
Further, the first pressure sensor is used for monitoring the air outlet pressure of the oxygen storage unit, the second pressure sensor is used for monitoring the air pressure after the third air resistance steady flow, and the third pressure sensor is used for detecting the ambient atmospheric pressure.
Further, the molecular tower is also provided with a fourth pressure sensor.
Further, the inside of each molecular tower is filled with a molecular sieve.
A second aspect of the present invention provides a flow rate adjustment method using the regulated pressure gas path structure according to any one of claims 1 to 6, comprising the following specific steps:
s1, acquiring a target air outlet pressure value P0, monitoring data P2 of a second pressure sensor and monitoring data P3 of a third pressure sensor in real time;
s2, acquiring a pressure difference value P between P2 and P3 23 Judging the differential pressure value P 23 Adjusting the control voltage VF of the second control valve according to the judgment result to obtain an adjusted P2';
s3, obtaining a pressure difference value P between P2' and P3 2ˊ3 Judging the differential pressure value P 2ˊ3 Up to the magnitude of P0 2ˊ3 And if the difference value with P0 is within the target range, executing step S2.
The closed-loop dynamic control of the pressure and the flow of the oxygen discharged by the oxygenerator is realized by the flow regulating component and the flow regulating method.
Further, the adjusting the control voltage of the second control valve according to the judgment result specifically includes:
the magnitude relation between the pressure difference value P23 and the pressure difference value P0 comprises more than, less than and equal to;
judging the magnitude relation between the pressure difference value P23 and the pressure difference value P0, adjusting the change trend of the control voltage VF according to the magnitude relation, and outputting the change trend of the control voltage VF:
when the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is larger than the preset value, the variation trend of the output control voltage VF is reduced;
when the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is smaller than the preset value, the variation trend of the output control voltage VF is rising;
when the magnitude relation between the differential pressure values P23 and P0 is equal to the predetermined value, the trend of the output control voltage VF is maintained.
Further, the method further comprises the step of obtaining monitoring data P3 of the third pressure sensor and monitoring data P4 of the fourth pressure sensor, and adjusting the pressure of the molecular tower according to the pressure difference value of the P3 and the P4.
Further, the method further comprises the steps of acquiring monitoring data P1 of the first pressure sensor and monitoring data P2 of the second pressure sensor;
and adjusting the third air resistance according to the pressure difference value between P1 and P2 as a reference value of the third air resistance pressure stabilization.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. through setting up multiunit molecular tower, every group molecular tower both ends are provided with first control valve and first air lock, be provided with check valve and second air lock between first air lock and the oxygen storage unit, through the pressure in every molecular tower in first air lock and the second air lock stable molecular tower group, set up the check valve and avoid the oxygen in the oxygen storage unit to flow back into each molecular tower and cause the oxygen loss, set up flow control assembly and carry out closed loop dynamic control to oxygenerator oxygen-out pressure and flow, prevent the change of gas concentration that fluctuation of pressure brought;
2. the dynamic control of the oxygen outlet pressure of the oxygen storage bin can be realized by matching with a mechanical structure, so that the oxygen outlet quantity of the oxygen generator is always maintained in a stable state, and the problem of oxygen concentration reduction caused by the increase or decrease of the oxygen outlet flow caused by the pressure fluctuation commonly existing in the precision and non-precision mechanical spring type pressure reducing valves in the market is thoroughly solved;
3. the influence of the resistance brought by the overlong user pipeline on the gas flow can be solved, namely, if the resistance reaches a certain degree, the user pipeline is reminded to be blocked, and the problem is found and solved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a voltage stabilizing air circuit in an embodiment of the invention;
fig. 2 is a schematic diagram of a voltage stabilizing gas circuit in an embodiment of the invention.
In the drawings, the reference numerals and corresponding part names:
10. a molecular tower group; 11. a molecular tower; 12. a first control valve; 13. a first air lock; 14. a one-way valve; 15. a second air resistance; 20. a nitrogen removal unit; 21. a nitrogen discharging bin; 30. an oxygen storage unit; 31. a first oxygen storage bin; 32. a second control valve; 33. a second oxygen storage bin; 40. a flow regulating assembly; 41. a first pressure sensor; 42. a third air resistance; 43. a second pressure sensor; 44. a third pressure sensor; 45. a fourth pressure sensor; 46. and a third control valve.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a pressure stabilizing air path structure, which includes a nitrogen discharging unit 20, a molecular tower group 10, an oxygen storage unit 30 and a flow adjusting assembly 40 connected in sequence;
the molecular tower group 10 comprises a plurality of groups of molecular towers 11, and a first control valve 12 and a first air resistor 13 are arranged at two ends of each group of molecular towers 11;
the first control valve 12 is connected with the nitrogen discharge unit 20, the first air resistor 13 is connected with the oxygen storage unit 30, and a one-way valve 14 and a second air resistor 15 are arranged between the first air resistor 13 and the oxygen storage unit 30;
the flow regulating assembly 40 includes a first pressure sensor 41, a third air resistor 42, a second pressure sensor 43, and a third pressure sensor 44, which are sequentially disposed.
According to the invention, through arranging a plurality of groups of molecular towers 11, both ends of each group of molecular towers 11 are provided with a first control valve 12 and a first air resistor 13, the first control valve 12 is arranged to control the nitrogen discharging speed, the air pressure stability during nitrogen discharging is ensured, the air pressure stability in the molecular towers 11 is ensured, a one-way valve 14 and a second air resistor 15 are arranged between the first air resistor 13 and an oxygen storage unit 30, the pressure in each molecular tower 11 in the molecular tower group 10 is stabilized through the first air resistor 13 and the second air resistor 15, the one-way valve 14 is arranged to prevent oxygen in the oxygen storage unit 30 from flowing back into each molecular tower 11 to cause oxygen loss, and the first pressure sensor 41, the third air resistor 42, the second pressure sensor 43 and the third pressure sensor 44 are mutually matched to carry out closed-loop dynamic control on the pressure and flow of oxygen discharged by an oxygen generator, so as to prevent the change of gas concentration caused by pressure fluctuation.
In some possible embodiments, the nitrogen removal unit 20 includes a nitrogen removal bin 21 and a first control valve 12 on the path from each molecular tower 11 to the nitrogen removal bin 21, and is capable of periodically removing nitrogen from each molecular tower 11, so as to ensure that the base pressure in each molecular tower 11 is higher than the current ambient atmospheric pressure.
In some possible embodiments, the aperture of the second air resistor 15 is larger than the aperture of the first air resistor 13. The aperture of the second air resistor 15 is larger than that of the first air resistor 13, so that the process of blocking oxygen to be discharged into the oxygen storage unit 30 can be avoided, and the efficiency of collecting oxygen in each molecular tower 11 is improved. Meanwhile, the aperture setting of the first gas resistor 13 can not only smoothly discharge oxygen separated from the molecular towers 11, but also avoid that the pressure in the molecular towers 11 is reduced too quickly due to too quick oxygen discharge in the molecular towers 11 to influence the adsorption performance of the molecular sieve, and the corresponding branches of each molecular tower 11 are also mutually communicated, so that the pressure equalizing process of each molecular tower 11 is favorably set in a time period before oxygen production after nitrogen is discharged from one of the molecular towers 11, the time of filling compressed air is prolonged due to too small pressure in the molecular towers 11, and the oxygen production efficiency is improved.
In some possible embodiments, the oxygen storage unit 30 specifically includes: the first oxygen storage bin 31, the second control valve 32 and the second oxygen storage bin 33 are sequentially arranged. The first oxygen storage bin 31 is used as a primary oxygen storage bin and is communicated with a main road where the second air resistor 15 is located, the opening degree of the second control valve 32 can be controlled and regulated, oxygen in the first oxygen storage bin 31 flows into the second oxygen storage bin 33 through the second control valve 32, and the fluctuation of the oxygen outlet pressure can be primarily reduced due to a buffering effect on the oxygen pressure.
In some possible embodiments, the first pressure sensor 41 is used to monitor the outlet pressure of the oxygen storage unit 30, the second pressure sensor 43 is used to monitor the gas pressure after the third air resistor 42 is stabilized, and the third pressure sensor 44 is used to detect the ambient atmospheric pressure. The differential pressure between the first pressure sensor 41 and the second pressure sensor 43 can be used as a reference value for stabilizing the pressure of the third air resistor 42, and the differential pressure between the second pressure sensor 43 and the third pressure sensor 44 can be used for representing the final outlet air pressure and flow.
In some possible embodiments, the molecular tower 11 is further provided with a fourth pressure sensor 45, one of the molecular towers 11 in the molecular tower group 10 is connected with the fourth pressure sensor 45 for monitoring the pressure in the molecular tower 11, so as to ensure the pressurized adsorption performance of the molecular sieve in the molecular tower 11, and the other end of the fourth pressure sensor 45 connected with the molecular tower 11 is connected with a third control valve 46, and the third control valve 46 is the same as the first control valve 12.
In some possible embodiments, the molecular towers 11 are filled with molecular sieves, and an air compressor unit is further connected to the molecular towers 11, and the air compressor unit includes an air compressor for providing compressed air to the molecular tower set 10.
Example 2
The embodiment provides a flow regulating method based on a stabilized pressure gas path structure based on the basis of embodiment 1, which comprises the following specific steps:
s1, acquiring a target air outlet pressure value P0, monitoring data P2 of a second pressure sensor 43 and monitoring data P3 of a third pressure sensor 44 in real time;
s2, acquiring a pressure difference value P between P2 and P3 23 Judging the differential pressure value P 23 And P0, regulating the control voltage VF of the second control valve 32 according to the judgment result to obtain regulated P2';
s3, obtaining a pressure difference value P between P2' and P3 2ˊ3 Judging the differential pressure value P 2ˊ3 With P0Up to the pressure difference value P 2ˊ3 And if the difference value with P0 is within the target range, executing step S2.
Closed-loop dynamic control of the pressure and flow of the oxygenerator oxygen is realized by the flow regulating assembly 40 in combination with a flow regulating method.
In some possible embodiments, adjusting the control voltage of the second control valve 32 according to the determination result specifically includes:
the magnitude relation between the pressure difference value P23 and P0 comprises more than, less than and equal to;
judging the magnitude relation between the differential pressure value P23 and P0, and adjusting the change trend of the control voltage VF according to the magnitude relation;
and outputting the change trend of the control voltage VF.
When the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is larger than the preset value, the variation trend of the output control voltage VF is reduced;
when the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is smaller than the preset value, the variation trend of the output control voltage VF is rising;
when the magnitude relation between the differential pressure values P23 and P0 is equal to the predetermined value, the trend of the output control voltage VF is maintained.
In some possible embodiments, the method further includes acquiring the monitoring data P3 of the third pressure sensor 44 and the monitoring data P4 of the fourth pressure sensor 45, and adjusting the pressure of the molecular tower 11 according to the differential pressure value of P3 and P4.
Acquiring monitoring data P1 of the first pressure sensor 41 and monitoring data P2 of the second pressure sensor 43; the third air resistor 42 is adjusted according to the differential pressure value between P1 and P2 as a reference value for the voltage stabilization of the third air resistor 42.
When the pressure of the molecular tower 11 is adjusted, the monitoring data of the first pressure sensor 41 and the second pressure sensor 43 are affected, and thus the obtained monitoring data are all data in a real-time state.
Example 3
The voltage-stabilizing electromagnetic valve is a high-speed electromagnetic valve or a proportional electromagnetic valve, for example, the opening of the voltage-stabilizing electromagnetic valve is controlled by voltage, and the control method is as follows:
assuming that the opening range of the proportional solenoid valve is Vc to Vo, where Vc is a control voltage value at which the opening of the proportional solenoid valve is 0 (i.e., closed state), vo is a control voltage value at which the opening of the proportional solenoid valve is 100 (i.e., fully open state), and the control parameter of the proportional solenoid valve is set to VF, the dynamic control range of VF is Vc to Vo. If the control pressure difference value P23 of the oxygen outlet pressure of the oxygenerator is set to be 50kPa, the actual detected and calculated pressure difference value P23 is 60kPa, at the moment, the current oxygen outlet pressure is judged to be greater than the control target value, the value of the control parameter VF for reducing the opening degree of the proportional solenoid valve is regulated, so that the pressure difference value P23 is reduced, otherwise, if the current oxygen outlet pressure is judged to be smaller than the control target value, the value of the control parameter VF for increasing the opening degree of the proportional solenoid valve is increased, and finally, the value of the pressure difference value P23 is stabilized at the control target value, so that the dynamic stable control of the oxygen outlet pressure of the oxygenerator is realized.
When the differential pressure value P23 is judged, if the judging result is that the differential pressure value deviates from the range of normal values, the pipeline blockage of the user can be primarily judged and reminded.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The pressure stabilizing gas circuit structure is characterized by comprising a nitrogen discharging unit (20), a molecular tower group (10), an oxygen storage unit (30) and a flow regulating assembly (40) which are connected in sequence;
the molecular tower groups (10) comprise a plurality of groups of molecular towers (11), and a first control valve (12) and a first gas resistor (13) are arranged at two ends of each group of molecular towers (11);
the first control valve (12) is connected with the nitrogen discharge unit (20), the first air resistor (13) is connected with the oxygen storage unit (30), and a one-way valve (14) and a second air resistor (15) are further arranged between the first air resistor (13) and the oxygen storage unit (30);
the flow regulating assembly (40) comprises a first pressure sensor (41), a third air resistor (42), a second pressure sensor (43) and a third pressure sensor (44) which are sequentially arranged.
2. A voltage stabilizing gas circuit structure according to claim 1, characterized in that the pore size of said second gas barrier (15) is larger than the pore size of the first gas barrier (13).
3. The pressure stabilizing gas circuit structure according to claim 2, wherein said oxygen storage unit (30) specifically comprises: the first oxygen storage bin (31), the second control valve (32) and the second oxygen storage bin (33) are sequentially arranged.
4. A stabilized gas circuit structure according to claim 3, wherein the first pressure sensor (41) is configured to monitor the gas outlet pressure of the oxygen storage unit (30), the second pressure sensor (43) is configured to monitor the gas pressure after the third air resistor (42) is stabilized, and the third pressure sensor (44) is configured to detect the ambient atmospheric pressure.
5. The pressure stabilizing gas circuit structure according to claim 4, wherein said molecular tower (11) is further provided with a fourth pressure sensor (45).
6. A pressure stabilizing gas circuit structure according to claim 1, wherein the inside of each molecular tower (11) is filled with molecular sieves.
7. A flow rate adjusting method using the stabilized pressure gas path structure as claimed in any one of claims 1 to 6, comprising the specific steps of:
s1, acquiring a target air outlet pressure value P0, monitoring data P2 of a second pressure sensor (43) and monitoring data P3 of a third pressure sensor (44) in real time;
s2, acquiring a pressure difference value P between P2 and P3 23 Judging the differential pressure value P 23 And P0, and adjusting the control voltage VF of the second control valve (32) according to the judgment result to obtainObtaining regulated P2';
s3, obtaining a pressure difference value P between P2' and P3 2ˊ3 Judging the differential pressure value P 2ˊ3 Up to the magnitude of P0 2ˊ3 And if the difference value with P0 is within the target range, executing step S2.
8. A flow rate adjustment method according to claim 7, characterized in that the adjusting the control voltage of the second control valve (32) according to the determination result specifically comprises:
the magnitude relation between the pressure difference value P23 and the pressure difference value P0 comprises more than, less than and equal to;
judging the magnitude relation between the pressure difference value P23 and the pressure difference value P0, adjusting the change trend of the control voltage VF according to the magnitude relation, and outputting the change trend of the control voltage VF:
when the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is larger than the preset value, the variation trend of the output control voltage VF is reduced;
when the magnitude relation between the differential pressure value P23 and the differential pressure value P0 is smaller than the preset value, the variation trend of the output control voltage VF is rising;
when the magnitude relation between the differential pressure values P23 and P0 is equal to the predetermined value, the trend of the output control voltage VF is maintained.
9. A flow regulating method according to claim 7, further comprising acquiring the monitoring data P3 of the third pressure sensor (44) and the monitoring data P4 of the fourth pressure sensor (45), and adjusting the pressure of the molecular tower (11) according to the differential pressure value of P3 and P4.
10. A flow regulating method according to claim 7, further comprising acquiring monitoring data P1 of the first pressure sensor (41) and monitoring data P2 of the second pressure sensor (43);
and adjusting the third air resistor (42) according to the pressure difference value between the P1 and the P2 as a reference value for stabilizing the third air resistor (42).
CN202310191278.0A 2023-03-02 2023-03-02 Pressure stabilizing gas circuit structure and flow adjusting method Pending CN116146900A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310191278.0A CN116146900A (en) 2023-03-02 2023-03-02 Pressure stabilizing gas circuit structure and flow adjusting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310191278.0A CN116146900A (en) 2023-03-02 2023-03-02 Pressure stabilizing gas circuit structure and flow adjusting method

Publications (1)

Publication Number Publication Date
CN116146900A true CN116146900A (en) 2023-05-23

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Application Number Title Priority Date Filing Date
CN202310191278.0A Pending CN116146900A (en) 2023-03-02 2023-03-02 Pressure stabilizing gas circuit structure and flow adjusting method

Country Status (1)

Country Link
CN (1) CN116146900A (en)

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