CN107934918B - Oxygen generation control system of PSA oxygenerator - Google Patents
Oxygen generation control system of PSA oxygenerator Download PDFInfo
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- CN107934918B CN107934918B CN201711286783.4A CN201711286783A CN107934918B CN 107934918 B CN107934918 B CN 107934918B CN 201711286783 A CN201711286783 A CN 201711286783A CN 107934918 B CN107934918 B CN 107934918B
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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
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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
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0028—Separation of the specific gas from gas mixtures containing a minor amount of this specific gas
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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
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0043—Impurity removed
- C01B2210/0046—Nitrogen
Abstract
The invention provides an oxygen generation control system of a PSA oxygen generator. The PSA oxygenerator comprises an air compressor, a freeze-drying machine and an oxygenerator, and an oxygen generation control system of the PSA oxygenerator at least comprises an air tank drainage system, an oxygen concentration adjustment control and alarm system, a freeze-drying machine control system, a PLC control program and a network control system; the air tank drainage system at least comprises a pressure sensor arranged at the bottom of the air storage tank, a drainage pneumatic control valve arranged at the bottom of the air storage tank and a dew point monitoring device arranged at the outlet of the air storage tank. The drainage system of the control system is provided with the dew point monitoring device at the outlet of the air storage tank through the pressure sensor and the drainage pneumatic control valve arranged at the bottom of the air storage tank, can accurately control the drainage time and the drainage interval of the air tank according to the pressure of the air tank and the dew point, and is an oxygen generation control system of the PSA oxygenerator with more accurate control, more stable performance and good safety.
Description
Technical Field
The invention relates to the technical field of oxygen generation, in particular to an oxygen generation control system of a PSA (pressure swing adsorption) oxygen generator, which has the advantages of more accurate control, more stable performance and good safety.
Background
The control system of the prior PSA oxygenerator has the following defects:
1. the traditional air tank drainage system is realized by installing an electronic drainage valve or a floating ball type drainage valve at the bottom of an air tank, the basic principle is that drainage time is set in advance or a floating ball is floated to drain water when the water level in a water storage container reaches a certain height, the electronic drainage valve only can set drainage time and drainage gaps in advance, the time interval cannot be set too short and is not suitable for some special occasions, and the floating ball type drainage valve is easy to condense the floating ball by oil under the conditions of low environmental temperature and poor air source quality, so that the drainage valve cannot be opened;
2. when the traditional oxygen generator detects that the oxygen concentration is lower than 90%, a fault is output and the oxygen generator is automatically stopped, so that the hospital cannot provide enough oxygen when oxygen is needed, and meanwhile, the hospital knows the condition of the oxygen generator only after the oxygen concentration is lower than 90%, and only after the oxygen generator is completely out of operation, a manufacturer is informed to maintain, so that the hospital cannot provide oxygen due to the fact that oxygen is needed in time;
3. traditional oxygenerator just can maintain the cold machine of doing when detecting that the air dew point is low or the cold machine of doing trouble appears, the cold machine system control of doing at present simultaneously mainly is simple opens and stops the control, only the cold machine of doing starts the simple control flow that the air compressor machine just started after the settlement time simultaneously, to in the adjustment of the dew point of cold machine itself, the adjustment of refrigerant volume and bypass valve can't go on, can only shut down when the cold machine of doing appears ice stifled simultaneously.
Disclosure of Invention
The invention aims to provide an oxygen generation control system of a PSA oxygenerator, aiming at the defects of poor structural controllability, inconvenient drainage time setting or easy drainage fault, imperfect oxygen concentration adjustment control and alarm system and simple control of a refrigeration dryer of the existing air tank, the drainage system of the control system can accurately control the drainage time and the drainage interval of the air tank according to the pressure and the dew point of the air tank by installing a pressure sensor and a drainage pneumatic control valve at the bottom of the air tank and installing a dew point monitoring device at the outlet of the air tank, and simultaneously, the oxygen concentration adjustment control and alarm system and the refrigeration dryer control system are improved, so that the oxygen generation control system of the PSA oxygenerator has more accurate control, more stable performance and good safety.
In order to solve the above-mentioned prior art problems, the technical scheme of the invention is as follows:
the invention relates to an oxygen generation control system of a PSA oxygenerator, which comprises an air compressor, a refrigeration dryer and an oxygenerator, wherein the oxygenerator comprises a box body, a pipeline component, an adsorption tower component and a control system, which are arranged on the box body;
as an improvement, the oxygen generation control system of the PSA oxygen generator at least comprises an air tank drainage system, an oxygen concentration adjustment control and alarm system, a refrigeration dryer control system, a PLC control program and a network control system;
as an improvement, the air tank drainage system at least comprises a pressure sensor arranged at the bottom of the air storage tank, a drainage pneumatic control valve arranged at the bottom of the air storage tank and a dew point monitoring device arranged at an outlet of the air storage tank;
the opening and closing of the drainage pneumatic control valve, the drainage time and the drainage interval are controlled by a PLC control program, and the drainage time and the drainage interval can be set to be accurate to millisecond level;
the action mode of the drainage pneumatic control valve is as follows:
by arranging the pressure sensor on the air tank, when the pressure on the air tank approaches the shutdown or unloading pressure of the air compressor, the drainage pneumatic control valve is opened to discharge excessive gas and discharge partial moisture; when the gas dew point at the outlet of the air tank rises, increasing the water drainage time or reducing the water drainage interval by PLC program control, reducing the water content in the air storage tank, and further reducing the dew point to ensure the quality of a gas source; when the pressure of the air storage tank is reduced to a set value, the drainage time is reduced or the drainage interval is increased through PLC program control, and the pressure of the air storage tank is ensured to be more than a stable value; on the premise of ensuring that the dew point of an air source meets the use requirement, the excessive drainage causes the pressure of an air storage tank to be too low, and the air storage tank still cannot reach the balance after being adjusted for many times, an alarm program is started through a PLC program control system, a buzzer and an alarm lamp are started, and meanwhile, a short message or other modes are utilized to give an alarm to an equipment manager through a remote control program.
The oxygen concentration adjusting, controlling and alarming system at least comprises an oxygen concentration sensor arranged on the oxygen tank, an oxygen tank pressure gauge arranged on the oxygen tank, a flow meter arranged at the output end of the oxygen tank and an alarm;
the oxygen concentration adjustment control and alarm mode comprises the following steps:
acquiring the oxygen concentration of an oxygen concentration sensor, the pressure of an oxygen tank and a current flow value, transmitting the oxygen concentration, the pressure and the current flow value to a PLC (programmable logic controller), analyzing the oxygen concentration by the PLC, and establishing a database of the oxygen concentration value; the database can perform curve analysis on the relation between the oxygen concentration and the time, the system provides program control flows of 5 gears (more than 95%, 93-92%, 92-91%, 91-90%), different purging amounts of the purging valve are controlled according to different oxygen concentration intervals, the oxygen concentration is quickly increased to a high-concentration gear through different program control by adjusting the oxygen flow and the standby pressure of the oxygen tank in time to enable the oxygen concentration to be increased to a low-gear oxygen concentration; meanwhile, when the concentration is 91%, the system firstly sends out an early warning signal, and early warning reminding is carried out through a cloud control system, a remote control system and a mobile phone control system to remind a manufacturer and a hospital administrator to carry out field inspection and real-time monitoring in time; the system can carry out the analysis through the curve that the concentration reduces and the oxygen concentration after the program control flow adjustment, when appearing that the adjustment control procedure still can't improve oxygen concentration (the system sets up to adjust 2 intervals still can't improve the concentration, for example oxygen concentration initial value is 95.2%, still can't improve when oxygen concentration reduces to 93 ~ 92%), can remind the manufacturer through the high in the clouds, need maintain or overhaul, prevent that oxygen concentration has been less than 90% just to inform the manufacturer to maintain and delay the oxygen condition in hospital.
The control system of the air conditioner at least comprises a bypass valve arranged on the air conditioner and an air conditioner dew point sensor, wherein the air conditioner bypass valve adopts an automatic adjustment mode of analog quantity of 4-20 mA;
the action mode of the control system of the refrigeration dryer is as follows:
when the dew point sensor detects that the dew point rises, the bypass valve is closed; when the dew point sensor detects that the dew point is reduced, the bypass valve is opened greatly to prevent the ice blockage; meanwhile, a high-pressure signal and a low-pressure signal of the cold dryer are transmitted to the controller, the controller analyzes the collected high-pressure signal and low-pressure signal, when the refrigerant is R134a, the normal value of the low pressure is 0.2, and the normal value of the high pressure is 0.8-1.2; when the refrigerant is R404a, the low-pressure normal value is 0.5, and the high-pressure normal value is 1.5-1.8; the current state of the cold dryer is judged, and when the state is abnormal, the cold dryer can timely give an early warning and alarm through the remote control module and the cloud control.
The invention relates to an oxygen generation control system of a PSA oxygenerator, which has the following beneficial effects:
1. according to the drainage system of the control system, the pressure sensor and the drainage pneumatic control valve are installed at the bottom of the air storage tank, and the dew point monitoring device is installed at the outlet of the air storage tank, so that the drainage time and the drainage interval of the air storage tank can be accurately controlled according to the pressure and the dew point of the air storage tank, the timely drainage can be ensured, the large fluctuation of the pressure can not be caused, and the faults of the air compressor caused by frequent starting and stopping and frequent loading and unloading can be reduced;
2. the oxygen concentration adjustment control and alarm system is improved, different purging amounts of the purging valve can be controlled according to different oxygen concentration intervals, the oxygen concentration at a low gear is controlled by different programs through timely adjusting the oxygen flow and the standby pressure of the oxygen tank, and the oxygen concentration is quickly increased back to a high-concentration gear;
3. the control system of the air conditioner is improved, the bypass valve (the current bypass valve is manually adjusted) is automatically adjusted, the proper opening of the bypass valve can be correspondingly adjusted according to the dew point, the ice blockage phenomenon is prevented, and the required normal high pressure and low pressure can be analyzed by aiming at different refrigerants used by the air conditioner.
Drawings
Fig. 1 is a schematic structural diagram of an oxygen generation control system of a conventional PSA oxygen generator, in which 1 'is an air compressor, 2' is a freeze dryer, 3 'is an oxygen generator, and 14' is an air tank;
fig. 2 is a schematic structural diagram of an oxygen generation control system of a PSA oxygen generator according to the present invention.
Detailed Description
The invention is further illustrated by the following examples:
example (b):
the invention relates to an oxygen generation control system of a PSA oxygenerator, which comprises an air compressor 1, a refrigeration dryer 2 and an oxygenerator 3, wherein the oxygenerator comprises a box body, a pipeline component, an adsorption tower component and a control system which are arranged on the box body, a pressure gauge, a display component and an alarm system are arranged at the top of the box body, the adsorption tower component comprises a first adsorption tower component and a second adsorption tower component, the first adsorption tower component comprises a first upper vent and a first lower vent, and the second adsorption tower component comprises a second upper vent and a second lower vent;
the oxygen generation control system of the PSA oxygen generator at least comprises an air tank drainage system 10, an oxygen concentration adjustment control and alarm system 11, a refrigeration dryer control system 12, a PLC control program 13 and a network control system;
the air tank drainage system 10 at least comprises a pressure sensor 101 arranged at the bottom of the air storage tank, a drainage pneumatic control valve 102 arranged at the bottom of the air storage tank and a dew point monitoring device 103 arranged at the outlet of the air storage tank;
the opening and closing, the drainage time and the drainage interval of the drainage pneumatic control valve 102 are controlled by a PLC (programmable logic controller) control program 13, and the arrangement of the drainage time and the drainage interval can be accurate to millisecond level;
the action mode of the drainage pneumatic control valve 102 is as follows:
by providing the pressure sensor 101 on the air tank 14, when the pressure on the air tank approaches the shutdown or unloading pressure of the air compressor, the drain gas control valve 102 is opened to drain the excess gas and simultaneously drain part of the moisture; when the gas dew point at the outlet of the air tank rises, increasing the water drainage time or reducing the water drainage interval by PLC program control, reducing the water content in the air storage tank, and further reducing the dew point to ensure the quality of a gas source; when the pressure of the air storage tank is reduced to a set value, the drainage time is reduced or the drainage interval is increased through PLC program control, and the pressure of the air storage tank is ensured to be more than a stable value; on the premise of ensuring that the dew point of an air source meets the use requirement, the excessive drainage causes the pressure of an air storage tank to be too low, and the air storage tank still cannot reach the balance after being adjusted for many times, an alarm program is started through a PLC program control system, a buzzer and an alarm lamp are started, and meanwhile, a short message or other modes are utilized to give an alarm to an equipment manager through a remote control program.
The oxygen concentration adjusting, controlling and alarming system 11 at least comprises an oxygen concentration sensor arranged on the oxygen tank, an oxygen tank pressure gauge 111 arranged on the oxygen tank, a flow meter arranged at the output end of the oxygen tank and an alarm;
the oxygen concentration adjustment control and alarm mode comprises the following steps:
acquiring the oxygen concentration of an oxygen concentration sensor, the pressure of an oxygen tank and a current flow value, transmitting the oxygen concentration, the pressure and the current flow value to a PLC (programmable logic controller), analyzing the oxygen concentration by the PLC, and establishing a database of the oxygen concentration value; the database can perform curve analysis on the relation between the oxygen concentration and the time, the system provides program control flows of 5 gears (more than 95%, 93-92%, 92-91%, 91-90%), different purging amounts of the purging valve are controlled according to different oxygen concentration intervals, the oxygen concentration is quickly increased to a high-concentration gear through different program control by adjusting the oxygen flow and the standby pressure of the oxygen tank in time to enable the oxygen concentration to be increased to a low-gear oxygen concentration; meanwhile, when the concentration is 91%, the system firstly sends out an early warning signal, and early warning reminding is carried out through a cloud control system, a remote control system and a mobile phone control system to remind a manufacturer and a hospital administrator to carry out field inspection and real-time monitoring in time; the system can carry out the analysis through the curve that the concentration reduces and the oxygen concentration after the program control flow adjustment, when appearing that the adjustment control procedure still can't improve oxygen concentration (the system sets up to adjust 2 intervals still can't improve the concentration, for example oxygen concentration initial value is 95.2%, still can't improve when oxygen concentration reduces to 93 ~ 92%), can remind the manufacturer through the high in the clouds, need maintain or overhaul, prevent that oxygen concentration has been less than 90% just to inform the manufacturer to maintain and delay the oxygen condition in hospital.
The control system 12 of the air conditioner at least comprises a bypass valve 121 arranged on the air conditioner 2 and an air conditioner dew point sensor, wherein the air conditioner bypass valve adopts an automatic adjustment mode of analog quantity of 4-20 mA;
the action mode of the refrigeration dryer control system 12 is as follows:
when the dew point sensor detects that the dew point rises, the bypass valve is closed; when the dew point sensor detects that the dew point is reduced, the bypass valve is opened greatly to prevent the ice blockage; meanwhile, a high-pressure signal and a low-pressure signal of the cold dryer are transmitted to the controller, the controller analyzes the collected high-pressure signal and low-pressure signal, when the refrigerant is R134a, the normal value of the low pressure is 0.2, and the normal value of the high pressure is 0.8-1.2; when the refrigerant is R404a, the low-pressure normal value is 0.5, and the high-pressure normal value is 1.5-1.8; the current state of the cold dryer is judged, and when the state is abnormal, the cold dryer can timely give an early warning and alarm through the remote control module and the cloud control.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (6)
1. An oxygen generation control system of a PSA oxygenerator, the PSA oxygenerator comprises an air compressor, a refrigeration dryer and an oxygenerator, the oxygenerator comprises a box body, a pipeline component and an adsorption tower component and a control system which are arranged on the box body, the top of the box body is provided with a pressure gauge, a display component and an alarm system, the adsorption tower component comprises a first adsorption tower component and a second adsorption tower component, the first adsorption tower component comprises a first upper vent and a first lower vent, the second adsorption tower component comprises a second upper vent and a second lower vent, and the system is characterized in that,
the oxygen generation control system of the PSA oxygen generator at least comprises an air tank drainage system, an oxygen concentration adjustment control and alarm system, a refrigeration dryer control system, a PLC control program and a network control system;
the air tank drainage system at least comprises a pressure sensor arranged at the bottom of the air storage tank, a drainage pneumatic control valve arranged at the bottom of the air storage tank and a dew point monitoring device arranged at the outlet of the air storage tank;
the opening and closing of the drainage pneumatic control valve, the drainage time and the drainage interval are controlled by a PLC control program, and the drainage time and the drainage interval can be set to be accurate to millisecond level.
2. The oxygen generation control system of the PSA oxygenerator as set forth in claim 1, wherein the action mode of the water discharge pneumatic control valve is as follows:
by arranging the pressure sensor on the air tank, when the pressure on the air tank approaches the shutdown or unloading pressure of the air compressor, the drainage pneumatic control valve is opened to discharge excessive gas and discharge partial moisture; when the gas dew point at the outlet of the air tank rises, increasing the water drainage time or reducing the water drainage interval by PLC program control, reducing the water content in the air storage tank, and further reducing the dew point to ensure the quality of a gas source; when the pressure of the air storage tank is reduced to a set value, the drainage time is reduced or the drainage interval is increased through PLC program control, and the pressure of the air storage tank is ensured to be more than a stable value; on the premise of ensuring that the dew point of an air source meets the use requirement, the excessive drainage causes the pressure of an air storage tank to be too low, and the air storage tank still cannot reach the balance after being adjusted for many times, an alarm program is started through a PLC program control system, a buzzer and an alarm lamp are started, and meanwhile, a short message or other modes are utilized to give an alarm to an equipment manager through a remote control program.
3. The oxygen generation control system of the PSA oxygen generator as set forth in claim 1, wherein the oxygen concentration adjustment control and alarm system comprises at least an oxygen concentration sensor disposed on the oxygen tank, an oxygen tank pressure gauge disposed on the oxygen tank, a flow meter disposed at the output end of the oxygen tank, and an alarm.
4. The oxygen generation control system of the PSA oxygen generator as set forth in claim 1, wherein the oxygen concentration adjustment control and alarm modes are:
acquiring the oxygen concentration of an oxygen concentration sensor, the pressure of an oxygen tank and a current flow value, transmitting the oxygen concentration, the pressure and the current flow value to a PLC (programmable logic controller), analyzing the oxygen concentration by the PLC, and establishing a database of the oxygen concentration value; the database can perform curve analysis on the relation between the oxygen concentration and the time, the system provides 5 gears which are respectively program control flows of more than 95%, 93-92%, 92-91% and 91-90%, different purging amounts of a purging valve are controlled according to different oxygen concentration intervals, the oxygen concentration is quickly increased to a high-concentration gear through different program control by adjusting the oxygen flow and the standby pressure of an oxygen tank in time to enable the oxygen concentration to be increased to a low-gear oxygen concentration; meanwhile, when the concentration is 91%, the system firstly sends out an early warning signal, and early warning reminding is carried out through a cloud control system, a remote control system and a mobile phone control system to remind a manufacturer and a hospital administrator to carry out field inspection and real-time monitoring in time; the system can carry out analysis through the curve that the concentration reduces and the oxygen concentration after the program control flow adjustment, can remind the manufacturer through the high in the clouds when appearing that the adjustment control procedure still can't improve oxygen concentration, need carry out maintenance or maintenance, prevent that oxygen concentration from having been less than 90% just notifying the manufacturer to maintain and delay the oxygen condition of hospital.
5. The oxygen generation control system of the PSA oxygenerator as set forth in claim 1, wherein the freeze dryer control system at least comprises a bypass valve arranged on the freeze dryer and a freeze dryer dew point sensor, and the freeze dryer bypass valve adopts an automatic adjustment mode with an analog quantity of 4-20 mA.
6. The oxygen generation control system of the PSA oxygen generator, as set forth in claim 1, wherein the action mode of the refrigeration dryer control system is:
when the dew point sensor detects that the dew point rises, the bypass valve is closed; when the dew point sensor detects that the dew point is reduced, the bypass valve is opened greatly to prevent the ice blockage; meanwhile, a high-pressure signal and a low-pressure signal of the cold dryer are transmitted to the controller, the controller analyzes the collected high-pressure signal and low-pressure signal, when the refrigerant is R134a, the normal value of the low pressure is 0.2, and the normal value of the high pressure is 0.8-1.2; when the refrigerant is R404a, the low-pressure normal value is 0.5, and the high-pressure normal value is 1.5-1.8; the current state of the cold dryer is judged, and when the state is abnormal, the cold dryer can timely give an early warning and alarm through the remote control module and the cloud control.
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| CN110395693A (en) * | 2019-07-09 | 2019-11-01 | 珠海联创医疗科技有限公司 | A kind of remote controlled medical oxygen generating system |
| CN112346394B (en) * | 2020-09-27 | 2021-10-01 | 杭州博大净化设备有限公司 | Device for monitoring opening state of gas control valve in PSA (pressure swing adsorption) oxygen generator |
| CN113176754A (en) * | 2021-05-14 | 2021-07-27 | 广州埃珥赛璞医疗设备有限公司 | Remote monitoring system and method for medical molecular sieve oxygen generation equipment and computer equipment |
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