CN109761199B - VPSA oxygenerator module based on intelligent pressure control and oxygen generation method thereof - Google Patents
VPSA oxygenerator module based on intelligent pressure control and oxygen generation method thereof Download PDFInfo
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- CN109761199B CN109761199B CN201910159867.4A CN201910159867A CN109761199B CN 109761199 B CN109761199 B CN 109761199B CN 201910159867 A CN201910159867 A CN 201910159867A CN 109761199 B CN109761199 B CN 109761199B
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Abstract
The VPSA oxygen production module based on intelligent pressure control comprises a first adsorption tower, a second adsorption tower, a vacuum pump and an oxygen storage tank, wherein the air inlet and outlet ends of the first adsorption tower and the second adsorption tower are respectively communicated with an air inlet of an oxygen generator through a first control valve and a third control valve, and are simultaneously respectively communicated with a nitrogen outlet of the oxygen generator through a second control valve and a fourth control valve, and the nitrogen outlet is connected with the vacuum pump; the oxygen outlet ends of the first adsorption tower and the second adsorption tower are respectively communicated with an oxygen storage tank through a fifth control valve and a sixth control valve, and the oxygen storage tank is connected with an oxygen outlet of the oxygen generator; a seventh control valve is arranged between the connecting pipeline of the first adsorption tower and the fifth control valve and the connecting pipeline of the second adsorption tower and the sixth control valve; the system also comprises a first differential pressure sensor, a second differential pressure sensor, a third differential pressure sensor and a fourth differential pressure sensor. And provides an oxygen production method thereof. The oxygen production efficiency of the small-sized household medical oxygen generator is improved, and the application scene is more flexible.
Description
Technical Field
The invention relates to the field of small household medical oxygen generators, in particular to an intelligent pressure control-based VPSA oxygen generation module and an oxygen generation method thereof.
Background
When the oxygenerator works, the function of the molecular sieve can be fully exerted after the gas pressure in the adsorption tower reaches the ideal working pressure, so that the oxygenerator can be operated in the ideal state. If the air pressure in the adsorption tower is higher or lower, the oxygen production efficiency is affected, and the quality of the product air is reduced. At present, the small-sized household medical oxygen generator in the domestic market controls the switch of the electromagnetic valve based on time, thereby controlling the gas pressure in the adsorption tower.
The structure of the existing small-sized household medical oxygen generator is shown in fig. 1, and the small-sized household medical oxygen generator is provided with two adsorption towers and a control valve, wherein the control valve is a four-way valve and is provided with an air inlet, two air outlets and a nitrogen discharge port. The using time is used as a parameter to control one of the two air outlets to be in an air outlet state, and then the other air outlet is communicated with the nitrogen discharge port. For example, during the period T1, the air flow flows in from the air inlet, passes through the first adsorption tower from the first air outlet, and the longer the time T1, the greater the air pressure in the adsorption tower. At this time, the second air outlet is communicated with the second adsorption tower and the nitrogen discharge port. Then, during a period of time T2, the air flow flows in from the air inlet, passes through the second adsorption tower from the second air outlet, and the air pressure in the adsorption tower is larger as the time T2 is longer, and at the moment, the first air outlet is communicated with the first adsorption tower and the nitrogen discharge port. And so forth. The time control implementation way of the control valve can be to control the on-off time of the electromagnetic valve or control the rotating speed of the rotary valve motor.
However, the small household medical oxygenerator in the prior art has obvious defects:
1. Using time parameter control, the method belongs to open loop control. In addition, the time parameters are directly burnt into the control circuit board during production, and then the time parameters cannot be changed, and after the parameters are set by the control circuit board, the running state of the product cannot be adjusted in detail according to the use environment.
2. Because the use environments of different customers are different, for example, the air pressure in the low-altitude area is higher, and the gas in the adsorption tower can reach the target pressure in a certain time. However, in high altitude areas, the air is rarer, and if the air is controlled in the same time, the expected gas pressure in the adsorption tower is difficult to reach, so that the oxygenerator cannot reach the optimal working state.
And various components of the oxygenerator are aged (such as compressors and molecular sieves) after long-term use, and the operating efficiency of the components is lower than that of new machine components. Therefore, even in low altitude areas, after the oxygenerator is used for a long time, the target gas pressure in the adsorption tower may not be reached in the same control time, and the use effect may be deteriorated.
The oxygen generator in the large-scale industrial application has more control structures and control methods, but the structure in the large-scale industrial application is complex, the cost is high, and the oxygen generator cannot be applied to the small-scale oxygen generator in the field of home medical treatment. And the use environment of the oxygenerator for large industrial application is usually fixed, and the oxygenerator does not have the capability of adapting to different use environments.
Disclosure of Invention
In view of the above situation, in order to solve the problems of the above technology, the present invention provides an intelligent pressure control-based VPSA oxygen generating module and an oxygen generating method thereof, which can directly adopt a pressure parameter control method as a control means during oxygen generation, ensure that the air pressure in an adsorption tower reaches the target air pressure, improve the oxygen generating efficiency of a small-sized household medical oxygen generator, and have more flexible application scenes.
The VPSA oxygen generation module based on intelligent pressure control comprises a first adsorption tower, a second adsorption tower, a vacuum pump and an oxygen storage tank, wherein the air inlet and outlet ends of the first adsorption tower and the second adsorption tower are respectively communicated with an air inlet of an oxygen generator through a first control valve and a third control valve, and are simultaneously respectively communicated with a nitrogen outlet of the oxygen generator through a second control valve and a fourth control valve, and the nitrogen outlet is connected with the vacuum pump; the oxygen outlet ends (the other ends opposite to the air inlet and outlet ends) of the first adsorption tower and the second adsorption tower are respectively communicated with an oxygen storage tank through a fifth control valve and a sixth control valve, and the oxygen storage tank is connected with an oxygen outlet of an oxygen generator; a seventh control valve is arranged between the connecting pipeline of the first adsorption tower and the fifth control valve and the connecting pipeline of the second adsorption tower and the sixth control valve; the system further comprises a first differential pressure sensor, a second differential pressure sensor, a third differential pressure sensor and a fourth differential pressure sensor, wherein the first differential pressure sensor and the second differential pressure sensor are respectively arranged at the air inlet end and the air outlet end of the first adsorption tower and the second adsorption tower, the third differential pressure sensor is arranged on a pipeline between the first adsorption tower and the fifth control valve, and the fourth differential pressure sensor is arranged on a pipeline between the second adsorption tower and the sixth control valve.
Preferably, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve and the seventh control valve are respectively provided with a valve body, a valve cavity is arranged in the valve body, and a valve core is arranged in the valve cavity; one end of the valve inner cavity is provided with a threaded hole, and one end of the valve core is arranged in the threaded hole in a threaded connection manner and extends out of the valve inner cavity to be connected with the stepping motor through a coupler; the valve inner cavity is also provided with two air vents communicated with the outside, and one air vent is detachably jacked and sealed by the other end of the valve core. The two air vents can be used as an air inlet and an air outlet of the control valve respectively when the control valve is used, the stepping motor can drive the valve core to rotate, and because of the limitation of the threaded hole, axial movement can be generated in the valve cavity when the valve core rotates, so that one air vent can be pressed and sealed to enable the control valve to be in a closed state or separated from the air vent, and both the air vents are communicated with the valve cavity to enable the control valve to be in an open state. The coupling can be arranged in a clearance fit mode that the valve core or the motor output shaft can move relatively in the axial direction, and the valve core or the motor output shaft can be fixed relatively in the radial direction through a spline or other structures, so that the motor can drive the valve core to rotate, and the axial moving stroke is larger than the moving distance of the valve core in the valve inner cavity, so that the valve core can be ensured not to be separated from control in use.
Preferably, the air inlet and outlet ends of the first adsorption tower and the second adsorption tower are respectively provided with a molecular sieve upper cover, the molecular sieve upper cover of the first adsorption tower is provided with a first control valve and a second control valve, the molecular sieve upper cover is provided with three channels communicated with the outside, one of the channels is communicated with an air outlet vent of the first control valve, and the air inlet vent of the first control valve is communicated with an air inlet of the oxygenerator; the other channel of the molecular sieve upper cover is communicated with an air inlet vent of the second control valve, and an air outlet vent of the second control valve is communicated with a nitrogen outlet of the oxygenerator; the third channel of the molecular sieve upper cover is communicated with the first differential pressure sensor.
Preferably, the air inlet vent and the air outlet vent of the first control valve are perpendicular to each other, and the air inlet vent and the air outlet vent of the second control valve are parallel to each other. The device is convenient for arranging the air inlet pipeline and the nitrogen discharge pipeline of the oxygenerator, and avoids mutual interference, thereby reducing the volume.
Preferably, the air inlet and outlet ends of the second adsorption tower and the second adsorption tower are respectively provided with a molecular sieve upper cover, the molecular sieve upper cover of the second adsorption tower is provided with a third control valve and a fourth control valve, the molecular sieve upper cover is provided with three channels communicated with the outside, one of the channels is communicated with an air outlet vent of the third control valve, and an air inlet vent of the third control valve is communicated with an air inlet of the oxygenerator; the other channel of the molecular sieve upper cover is communicated with an air inlet vent of a fourth control valve, and an air outlet vent of the fourth control valve is communicated with a nitrogen outlet of the oxygenerator; the third channel of the molecular sieve upper cover is communicated with the second differential pressure sensor.
Preferably, the air inlet vent and the air outlet vent of the third control valve are perpendicular to each other, and the air inlet vent and the air outlet vent of the fourth control valve are parallel to each other. The device is convenient for arranging the air inlet pipeline and the nitrogen discharge pipeline of the oxygenerator, and avoids mutual interference, thereby reducing the volume.
Preferably, the oxygen outlet ends of the first adsorption tower and the second adsorption tower are provided with molecular sieve bottom covers, a first communication space and a second communication space are arranged in the molecular sieve bottom covers, and the molecular sieve bottom covers are provided with a first communication port, a second communication port, a third communication port and a fourth communication port; the first communication space is communicated with the inside of the first adsorption tower, the first communication port and the third communication port, the first communication port is communicated with an air inlet vent of the fifth control valve, and the third communication port is communicated with the third differential pressure sensor; the second communication space is respectively communicated with the inside of the second adsorption tower, the second communication port and the fourth communication port, the second communication port is communicated with an air inlet vent of the sixth control valve, and the fourth communication port is communicated with the fourth differential pressure sensor.
Preferably, the oxygen storage tank is provided with a fifth control valve and a sixth control valve, and air outlet vents of the fifth control valve and the sixth control valve are respectively communicated with the interior of the oxygen storage tank.
Preferably, a third communication space is further arranged in the molecular sieve bottom cover, a fifth communication port and a sixth communication port are further arranged on the molecular sieve bottom cover, and the third communication space is communicated with the fifth communication port and the sixth communication port; the fifth communication port is communicated with the first communication port, the sixth communication port is communicated with one air port of the seventh control valve, and the other air port of the seventh control valve is communicated with the second communication port.
The various communication structures can be realized by arranging the pipe joint and the pipeline, and the structure is simple and reliable and has small volume. Wherein the first communication port and the second communication port can be provided with a three-way structure to realize multi-way communication because more than one way of the first communication port and the second communication port are respectively connected.
Preferably, the molecular sieve bottom cover comprises a bottom cover substrate and a bottom cover sealing plate, wherein a communication space is arranged in the bottom cover substrate, and the bottom cover sealing plate is sealed on the bottom cover substrate. And the manufacturing and the assembly are convenient.
Preferably, the oxygen generating method of the VPSA oxygen generating module based on intelligent pressure control comprises the following steps:
Opening the first control valve, closing the third control valve, communicating the air inlet with the first adsorption tower through the first control valve, and inflating and pressurizing the first adsorption tower through the air inlet by air flow; simultaneously, a fourth control valve is opened, a second control valve is closed, the second adsorption tower is vacuumized through a vacuum pump through a nitrogen discharge port, and gas in the second adsorption tower or waste gas in the last working cycle in the second adsorption tower is extracted; at this time, the fifth control valve, the sixth control valve and the seventh control valve are all kept closed;
When the first differential pressure sensor and the third differential pressure sensor detect that the pressure in the first adsorption tower meets the preset adsorption pressure Y1, a fifth control valve is opened to supply oxygen to the oxygen storage tank;
Closing the fifth control valve after the pressures of the first differential pressure sensor and the third differential pressure sensor are increased to satisfy the predetermined adsorption pressure Y2;
Closing the first control valve, opening the third control valve, communicating the air inlet with the second adsorption tower through the third control valve, and inflating and pressurizing the second adsorption tower through the air inlet by air flow; simultaneously closing the fourth control valve, opening the second control valve, vacuumizing the first adsorption tower through the nitrogen discharge port by a vacuum pump, and extracting gas in the first adsorption tower or waste gas of the last working cycle in the second adsorption tower; at this time, the fifth control valve, the sixth control valve and the seventh control valve are all kept closed;
when the second differential pressure sensor and the fourth differential pressure sensor detect that the pressure in the second adsorption tower meets the preset adsorption pressure Y1, a sixth control valve is opened to supply oxygen to the oxygen storage tank;
after the pressures of the second differential pressure sensor and the fourth differential pressure sensor are increased to meet the preset adsorption pressure Y2, closing the sixth control valve;
The above steps are circularly performed.
Preferably, in the step, after the first differential pressure sensor and the third differential pressure sensor detect that the pressure in the first adsorption tower meets the predetermined adsorption pressure Y1, the seventh control valve is opened to blow back the second adsorption tower, then the seventh control valve is closed, and the fifth control valve is opened to supply oxygen to the oxygen storage tank. The back blowing step mainly blows the waste gas possibly remained in the pipeline and the adsorption tower or the gas with insufficient oxygen content (oxygen concentration) into the second adsorption tower, and can be pumped out by a vacuum pump, thereby ensuring that the oxygen supplied to the oxygen storage tank subsequently has higher product quality.
Preferably, in the step, after the pressures of the first differential pressure sensor and the third differential pressure sensor are increased to satisfy the predetermined adsorption pressure Y2, the fifth control valve is closed, the seventh control valve is opened to back-blow the second adsorption tower again, and then the seventh control valve is closed. The back blowing step mainly comprises the step of pre-filling oxygen with high oxygen content (oxygen concentration) into the second adsorption tower, so that the fluctuation of the product quality in the subsequent process switching process is reduced.
Preferably, in the step, when the second differential pressure sensor and the fourth differential pressure sensor detect that the pressure in the second adsorption tower meets the preset adsorption pressure Y1, the seventh control valve is opened to blow back to the first adsorption tower, then the seventh control valve is closed, the sixth control valve is opened, and oxygen is supplied to the oxygen storage tank. The back blowing step mainly blows the waste gas possibly remained in the pipeline and the adsorption tower or the gas with insufficient oxygen content (oxygen concentration) into the first adsorption tower, and can be pumped out by a vacuum pump to ensure that the oxygen supplied to the oxygen storage tank subsequently has higher product quality.
Preferably, in the step, after the pressures of the second differential pressure sensor and the fourth differential pressure sensor are increased to satisfy the predetermined adsorption pressure Y2, the sixth control valve is closed, the seventh control valve is opened to back-blow the first adsorption tower again, and then the seventh control valve is closed. The back blowing step mainly comprises the step of pre-filling oxygen with high oxygen content (oxygen concentration) into the first adsorption tower, so that the fluctuation of the product quality in the subsequent process switching process is reduced.
Preferably, the adsorption pressure Y1 refers to a pressure value of the first differential pressure sensor and the third differential pressure sensor or a pressure value of the second differential pressure sensor and the fourth differential pressure sensor, which meets the following conditions:
The pressure values of the first differential pressure sensor and the third differential pressure sensor or the pressure values of the second differential pressure sensor and the fourth differential pressure sensor are all required to be within the optimal working pressure range of the molecular sieve arranged in the first adsorption tower or the second adsorption tower;
the integral of the pressure difference between the first pressure difference sensor and the third pressure difference sensor or the integral of the pressure difference between the second pressure difference sensor and the fourth pressure difference sensor accords with the condition of normal oxygen production operation.
Preferably, the adsorption pressure Y2 refers to a pressure value of the first differential pressure sensor and the third differential pressure sensor or a pressure value of the second differential pressure sensor and the fourth differential pressure sensor, which meets the following conditions:
The pressure values of the first differential pressure sensor and the third differential pressure sensor or the pressure values of the second differential pressure sensor and the fourth differential pressure sensor have tended to have an upper limit value of the operating pressure of the molecular sieve provided in the first adsorption column or the second adsorption column;
the integral of the pressure difference of the first differential pressure sensor and the third differential pressure sensor or the integral of the pressure difference of the second differential pressure sensor and the fourth differential pressure sensor has a tendency to become larger gradually.
After the technology provided by the invention is adopted, the VPSA oxygen generation module based on intelligent pressure control and the oxygen generation method thereof have the following beneficial effects: based on pressure control, the whole control system is convenient to be made into closed-loop control, and the stability and efficiency of the whole oxygen production system are improved. Ensuring that the gas pressure inside the adsorption tower can reach the ideal pressure when working in any environment. The problem of difference in the oxygenerator operation of different life-time states when different altitudes are solved, and the applicable scene is more nimble.
Drawings
FIG. 1 is a block diagram of a conventional small-sized domestic medical oxygenerator module;
FIG. 2 is a schematic diagram of a VPSA oxygen production module based on intelligent pressure control according to an embodiment of the application;
FIG. 3 is a schematic diagram of an embodiment of the present application of an intelligent pressure control based VPSA oxygen production module;
FIG. 4 is a half cross-sectional view of FIG. 3;
FIG. 5 is a cross-sectional view of the first control valve and the third control valve;
FIG. 6 is a cross-sectional view of the second control valve and the fourth control valve;
FIG. 7 is a bottom cover substrate block diagram of a molecular sieve bottom cover;
FIG. 8 is a rear view of the structure of FIG. 7;
FIG. 9 is a schematic diagram of a control valve stepper motor according to an embodiment of the present application;
Fig. 10 is a schematic diagram of pressure sensor control according to an embodiment of the present application.
Detailed Description
The invention will be described in further detail with reference to the examples given in the accompanying drawings. The described embodiments include various specific details to aid in understanding, but they are to be considered merely exemplary and are representative of some, but not all embodiments of the invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. Meanwhile, a detailed description of functions and configurations well known in the art will be omitted for clarity and conciseness of the specification.
As shown in fig. 2-10, the VPSA oxygen generation module based on intelligent pressure control comprises a first adsorption tower 11, a second adsorption tower 12, a vacuum pump 2 and an oxygen storage tank 3, wherein the air inlet and outlet ends of the first adsorption tower 11 and the second adsorption tower 12 are respectively communicated with an oxygen generator air inlet 91 through a first control valve F1 and a third control valve F3, and are simultaneously respectively communicated with an oxygen generator nitrogen outlet 92 through a second control valve F2 and a fourth control valve F4, and the nitrogen outlet 92 is connected with the vacuum pump 2; the oxygen outlet ends (the other ends opposite to the air inlet and outlet ends) of the first adsorption tower 11 and the second adsorption tower 12 are respectively communicated with an oxygen storage tank 3 through a fifth control valve F5 and a sixth control valve F6, and the oxygen storage tank 3 is connected with an oxygen outlet 93 of an oxygenerator; a seventh control valve F7 is connected between the connecting pipeline between the first adsorption tower 11 and the fifth control valve F5 and the connecting pipeline between the second adsorption tower 12 and the sixth control valve F6; the system further comprises a first differential pressure sensor P1, a second differential pressure sensor P2, a third differential pressure sensor P3 and a fourth differential pressure sensor P4, wherein the first differential pressure sensor P1 and the second differential pressure sensor P2 are respectively arranged at the air inlet end and the air outlet end of the first adsorption tower 11 and the second adsorption tower 12, the third differential pressure sensor P3 is arranged on a pipeline between the first adsorption tower 11 and the fifth control valve F5, and the fourth differential pressure sensor P4 is arranged on a pipeline between the second adsorption tower 12 and the sixth control valve F6.
The first control valve F1, the second control valve F2, the third control valve F3, the fourth control valve F4, the fifth control valve F5, the sixth control valve F6 and the seventh control valve F7 are respectively provided with a valve body 8, a valve inner cavity 80 is arranged in the valve body 8, and a valve core 81 is arranged in the valve inner cavity 80; one end of the valve inner cavity 80 is provided with a threaded hole 801, and one end of the valve core 81 is arranged in the threaded hole 801 in a threaded connection manner and extends out of the valve inner cavity 80 to be connected with a stepping motor 89 through a coupler; the valve cavity 80 is also provided with two air vents communicated with the outside, and the other end of the valve core 81 can be detachably pressed to close one of the air vents. The two air ports can be used as an air inlet and an air outlet of the control valve respectively when the control valve is in use, the stepping motor 89 can drive the valve core 81 to rotate, and because of the limitation of the threaded hole 801, axial movement is generated in the valve cavity 80 when the valve core 81 rotates, so that one air port can be pressed and sealed to enable the control valve to be in a closed state or separated from the air port, and both the air ports are communicated with the valve cavity 80 to enable the control valve to be in an open state. The coupling may be configured to be in clearance fit with the valve core 81 or the motor output shaft that can move relatively in the axial direction, and the two may be fixed relatively in the radial direction by using a spline or other structures, so that the motor may drive the valve core 81 to rotate, and the axial movement travel is greater than the movement distance of the valve core 81 in the valve cavity 80, so that the valve core may not be separated from control in use.
The air inlet and outlet ends of the first adsorption tower 11 and the second adsorption tower 12 are respectively provided with a molecular sieve upper cover 4, the molecular sieve upper cover 4 of the first adsorption tower 11 is provided with a first control valve F1 and a second control valve F2, the molecular sieve upper cover 4 is provided with three channels communicated with the outside, one of the channels is communicated with an air outlet vent of the first control valve F1, and an air inlet vent of the first control valve F1 is communicated with an air inlet 91 of the oxygenerator; the other channel of the molecular sieve upper cover 4 is communicated with an air inlet port of a second control valve F2, and an air outlet port of the second control valve F2 is communicated with a nitrogen outlet port 92 of the oxygenerator; the third passage of the molecular sieve upper cover 4 communicates with the first differential pressure sensor P1.
The air inlet vent and the air outlet vent of the first control valve F1 are mutually perpendicular, and the air inlet vent and the air outlet vent of the second control valve F2 are mutually parallel. The device is convenient for arranging the air inlet pipeline and the nitrogen discharge pipeline of the oxygenerator, and avoids mutual interference, thereby reducing the volume.
The second adsorption tower 12 and the air inlet and outlet ends of the second adsorption tower 12 are respectively provided with a molecular sieve upper cover 4, the molecular sieve upper cover 4 of the second adsorption tower 12 is provided with a third control valve F3 and a fourth control valve F4, the molecular sieve upper cover 4 is provided with three channels communicated with the outside, one of the channels is communicated with an air outlet vent of the third control valve F3, and an air inlet vent of the third control valve F3 is communicated with an air inlet 91 of the oxygenerator; the other channel of the molecular sieve upper cover 4 is communicated with an air inlet port of a fourth control valve F4, and an air outlet port of the fourth control valve F4 is communicated with a nitrogen outlet port 92 of the oxygenerator; the third channel of the molecular sieve upper cover 4 is communicated with the second differential pressure sensor P2.
The air inlet vent and the air outlet vent of the third control valve F3 are perpendicular to each other, and the air inlet vent and the air outlet vent of the fourth control valve F4 are parallel to each other. The device is convenient for arranging the air inlet pipeline and the nitrogen discharge pipeline of the oxygenerator, and avoids mutual interference, thereby reducing the volume.
The oxygen outlet ends of the first adsorption tower 11 and the second adsorption tower 12 are provided with a molecular sieve bottom cover 5, a first communication space 51 and a second communication space 52 are arranged in the molecular sieve bottom cover 5, and a first communication port 501, a second communication port 502, a third communication port 503 and a fourth communication port 504 are arranged on the molecular sieve bottom cover 5; the first communication space 51 is communicated with the inside of the first adsorption tower 11, the first communication port 501 and the third communication port 503, the first communication port 501 is communicated with the air inlet vent of the fifth control valve F5, and the third communication port 503 is communicated with the third differential pressure sensor P3; the second communication space 52 is respectively communicated with the inside of the second adsorption tower 12, the second communication port 502 and the fourth communication port 504, the second communication port 502 is communicated with the air inlet vent of the sixth control valve F6, and the fourth communication port 504 is communicated with the fourth differential pressure sensor P4.
The oxygen storage tank 3 is provided with a fifth control valve F5 and a sixth control valve F6, and air outlet vents of the fifth control valve F5 and the sixth control valve F6 are respectively communicated with the interior of the oxygen storage tank 3.
A third communication space 53 is further arranged in the molecular sieve bottom cover 5, a fifth communication port 505 and a sixth communication port 506 are further arranged on the molecular sieve bottom cover 5, and the third communication space 53 is communicated with the fifth communication port 505 and the sixth communication port 506; the fifth communication port 505 communicates with the first communication port 501, the sixth communication port 506 communicates with one vent port of the seventh control valve F7, and the other vent port of the seventh control valve F7 communicates with the second communication port 502.
The various communication structures can be realized by arranging the pipe joint and the pipeline, and the structure is simple and reliable and has small volume. The first communication port 501 and the second communication port 502 may be configured with a three-way structure to realize multiple communication because they are connected in more than one way.
The molecular sieve bottom cover 5 comprises a bottom cover substrate 55 and a bottom cover sealing plate 56, a communication space is arranged in the bottom cover substrate 55, and the bottom cover sealing plate 56 is sealed on the bottom cover substrate 55. And the manufacturing and the assembly are convenient.
An oxygen generation method of a VPSA oxygen generation module based on intelligent pressure control comprises the following steps:
Step 1, a first control valve F1 is opened, a third control valve F3 is closed, an air inlet 91 is communicated with the first adsorption tower 11 through the first control valve F1, and air flow charges air into the first adsorption tower 11 through the air inlet 91; simultaneously, the fourth control valve F4 is opened, the second control valve F2 is closed, the second adsorption tower 12 is vacuumized through the nitrogen discharge port 92 by the vacuum pump 2, and the gas in the second adsorption tower 12 or the waste gas of the last working cycle in the second adsorption tower 12 is extracted; at this time, the fifth control valve F5, the sixth control valve F6, and the seventh control valve F7 are all kept closed;
Step 2, after the first differential pressure sensor P1 and the third differential pressure sensor P3 detect that the pressure in the first adsorption tower 11 meets the predetermined adsorption pressure Y1, opening a fifth control valve F5 to supply oxygen to the oxygen storage tank 3;
Step 3, after the pressures of the first differential pressure sensor P1 and the third differential pressure sensor P3 are increased to meet the predetermined adsorption pressure Y2, closing the fifth control valve F5;
Step 4, closing the first control valve F1, opening the third control valve F3, enabling the air inlet 91 to be communicated with the second adsorption tower 12 through the third control valve F3, and enabling air flow to charge air into the second adsorption tower 12 through the air inlet 91; simultaneously closing the fourth control valve F4, opening the second control valve F2, vacuumizing the first adsorption tower 11 through the nitrogen discharge port 92 by the vacuum pump 2, and extracting gas in the first adsorption tower 11 or waste gas in the second adsorption tower 12 in the last working cycle; at this time, the fifth control valve F5, the sixth control valve F6, and the seventh control valve F7 are all kept closed;
Step 5, after the second pressure difference sensor P2 and the fourth pressure difference sensor P4 detect that the pressure in the second adsorption tower 12 meets the predetermined adsorption pressure Y1, opening the sixth control valve F6 to supply oxygen to the oxygen storage tank 3;
Step 6, after the pressures of the second differential pressure sensor P2 and the fourth differential pressure sensor P4 are increased to meet the predetermined adsorption pressure Y2, closing the sixth control valve F6;
And 7, circularly executing the steps 1 to 6.
In the step 2, when the first differential pressure sensor P1 and the third differential pressure sensor P3 detect that the pressure in the first adsorption tower 11 meets the predetermined adsorption pressure Y1, the seventh control valve F7 is opened to blow back the second adsorption tower 12, then the seventh control valve F7 is closed, the fifth control valve F5 is opened, and oxygen is supplied to the oxygen storage tank 3. The back blowing step mainly blows the waste gas possibly remained in the pipeline and the adsorption tower or the gas with insufficient oxygen content (oxygen concentration) into the second adsorption tower 12, and can be pumped out by a vacuum pump, thereby ensuring that the oxygen subsequently supplied to the oxygen storage tank 3 has higher product quality.
In the step 3, after the pressures of the first differential pressure sensor P1 and the third differential pressure sensor P3 are increased to meet the predetermined adsorption pressure Y2, the fifth control valve F5 is closed, the seventh control valve F7 is opened to back-blow the second adsorption tower 12 again, and then the seventh control valve F7 is closed. The back blowing step mainly fills oxygen with higher oxygen content (oxygen concentration) into the second adsorption tower 12 in advance, so as to reduce the fluctuation of product quality in the subsequent process switching process.
In the step 5, when the second pressure difference sensor P2 and the fourth pressure difference sensor P4 detect that the pressure in the second adsorption tower 12 satisfies the predetermined adsorption pressure Y1, the seventh control valve F7 is opened to blow back the first adsorption tower 11, then the seventh control valve F7 is closed, the sixth control valve F6 is opened, and oxygen is supplied to the oxygen storage tank 3. The back blowing step mainly blows the waste gas possibly remained in the pipeline and the adsorption tower or the gas with insufficient oxygen content (oxygen concentration) into the first adsorption tower 11, and can be pumped out by a vacuum pump to ensure that the oxygen subsequently supplied to the oxygen storage tank 3 has higher product quality.
In the step 6, after the pressures of the second differential pressure sensor P2 and the fourth differential pressure sensor P4 are increased to satisfy the predetermined adsorption pressure Y2, the sixth control valve F6 is closed, the seventh control valve F7 is opened to back-blow the first adsorption tower 11 again, and then the seventh control valve F7 is closed. The back blowing step mainly fills oxygen with higher oxygen content (oxygen concentration) into the first adsorption tower 11 in advance, so as to reduce the fluctuation of product quality in the subsequent process switching process.
Further, the adsorption pressure Y1 refers to the pressure value of the first differential pressure sensor P1 and the third differential pressure sensor P3 or the pressure value of the second differential pressure sensor P2 and the fourth differential pressure sensor P4 meets the following conditions:
The pressure values of the first pressure difference sensor P1 and the third pressure difference sensor P3 or the pressure values of the second pressure difference sensor P2 and the fourth pressure difference sensor P4 are all required to be within the optimal working pressure range of the molecular sieve arranged in the first adsorption tower 11 or the second adsorption tower 12;
The integral of the pressure difference of the first pressure difference sensor P1 and the third pressure difference sensor P3 or the integral of the pressure difference of the second pressure difference sensor P2 and the fourth pressure difference sensor P4 meets the condition of normal oxygen production operation.
Further, the adsorption pressure Y2 refers to the pressure value of the first differential pressure sensor P1 and the third differential pressure sensor P3 or the pressure value of the second differential pressure sensor P2 and the fourth differential pressure sensor P4 meets the following conditions:
the pressure values of the first pressure difference sensor P1 and the third pressure difference sensor P3 or the pressure values of the second pressure difference sensor P2 and the fourth pressure difference sensor P4 have tended to have an upper limit value of the operating pressure of the molecular sieve provided in the first adsorption tower 11 or the second adsorption tower 12;
The integral of the pressure difference of the first pressure difference sensor P1 and the third pressure difference sensor P3 or the integral of the pressure difference of the second pressure difference sensor P2 and the fourth pressure difference sensor P4 tends to become larger gradually.
According to the intelligent pressure control-based VPSA oxygen production module, VPSA refers to low-pressure adsorption vacuum desorption, and the intelligent pressure control-based VPSA oxygen production module refers to the pressure control-based low-pressure adsorption vacuum desorption oxygen production module. The adsorption pressure Y1 can be understood as an ideal operating state of the adsorption tower. The first differential pressure sensor P1 and the third differential pressure sensor P3 will be further described below as examples, and the second differential pressure sensor P2 and the fourth differential pressure sensor P4 are the same as each other. In the Y1 state, the values of the first differential pressure sensor P1 and the third differential pressure sensor P3 need to satisfy the following conditions: 1. the pressure values of the first differential pressure sensor P1 and the third differential pressure sensor P3 are required to be within the optimal working pressure range recommended by molecular sieve suppliers; 2. the integral of the pressure difference of the first pressure difference sensor P1 and the third pressure difference sensor P3 meets the condition of normal operation. The adsorption pressure Y2 can also be understood as an operating state, in which the values of the first differential pressure sensor P1 and the third differential pressure sensor P3 are: 1. the pressure values of the first differential pressure sensor P1 and the third differential pressure sensor P3 have tended to be the upper limit value of the vendor recommended pressure; 2. the integral of the pressure difference of the first differential pressure sensor P1 and the third differential pressure sensor P3 tends to be gradually larger.
Molecular sieves are particulate materials that actually work within an adsorption column. When the device works, the air pressure is too large or too small, which is not beneficial to the performance of the device; when the first adsorption tower 11 is operated, the pressure difference between the first pressure difference sensor P1 and the second pressure difference sensor P2 is not constant. The pressure difference is relatively large when the working is started, then the pressure difference is slowly reduced, and the pressure difference is increased after the critical value is exceeded. If the pressure difference becomes large, this indicates that the switching to the second adsorption tower 12 is operated. The second adsorption column 12 operates in the same manner.
According to the VPSA oxygen generation module based on intelligent pressure control, the quantity of gas flowing through the valve can be controlled with high precision through the structural design of the first control valve F1, the second control valve F2, the third control valve F3, the fourth control valve F4, the fifth control valve F5, the sixth control valve F6 and the seventh control valve F7 and the combination of the valve and the stepping motor, so that the high-efficiency operation of the whole system can be realized. The stepping motor drives the valve core to rotate, and because the valve core is provided with threads, the valve core can axially move, so that the switching state of the whole valve is controlled. The state of the valve is not only on-off, but also any state between on-off. Thus, the pressure in the adsorption tower can be controlled more accurately. Meanwhile, the stepping motor has better precision than a common motor, and can be controlled to rotate by a designated angle without deviation.
According to the VPSA oxygen production module based on intelligent pressure control, the connection parts, the communication spaces, the communication ports, the air ports and the like of all the components can adopt a mode of embedding sealing rings into sealing grooves according to requirements so as to ensure the tightness of the required space or channel, and the specific setting mode can adopt a common sealing technology, so that the application is not repeated, and the sealing structure of part of important parts is also shown in the drawings for reference.
The VPSA oxygen generation module based on intelligent pressure control according to the application is provided with 7 control valves F1-F7 and 4 differential pressure sensors P1-P4 as shown in figure 2. The stepping motor of the 7 control valves uses a four-phase eight-beat stepping motor, and the model is 24BYJ-48. The pressure difference sensor is MPX5500DP, the pressure range is 0-500kpa, and the maximum error is +/-2.5%, so that the measured pressure is more accurate. The control schematic diagram of the stepping motor is shown in the figure, and the control schematic diagram of the pressure sensor is shown in the figure.
According to the VPSA oxygen generation module and the oxygen generation method based on intelligent pressure control, the whole control system is conveniently made into closed-loop control based on pressure control, and the stability and the efficiency of the whole oxygen generation system are improved. Ensuring that the gas pressure inside the adsorption tower can reach the ideal pressure when working in any environment. The problem of difference in the oxygenerator operation of different life-time states when different altitudes are solved, and the applicable scene is more nimble.
As used herein, the terms "upper", "lower" or "above", "below" or the like refer to the relationship in normal use of the device, i.e., the relationship generally illustrated in the drawings. When the placement state changes, for example, when turning over, the corresponding positional relationship should be changed accordingly to understand or implement the technical scheme of the application.
Claims (5)
1. The VPSA oxygen generation module based on intelligent pressure control comprises a first adsorption tower, a second adsorption tower, a vacuum pump and an oxygen storage tank, wherein the air inlet and outlet ends of the first adsorption tower and the second adsorption tower are respectively communicated with an air inlet of an oxygen generator through a first control valve and a third control valve, and are simultaneously respectively communicated with a nitrogen outlet of the oxygen generator through a second control valve and a fourth control valve, and the nitrogen outlet is connected with the vacuum pump; the oxygen outlet ends of the first adsorption tower and the second adsorption tower are respectively communicated with an oxygen storage tank through a fifth control valve and a sixth control valve, and the oxygen storage tank is connected with an oxygen outlet of an oxygen generator; a seventh control valve is arranged between the connecting pipeline of the first adsorption tower and the fifth control valve and the connecting pipeline of the second adsorption tower and the sixth control valve; the system comprises a first adsorption tower, a second adsorption tower, a fifth control valve, a sixth control valve, a valve body, a first differential pressure sensor, a second differential pressure sensor, a third differential pressure sensor, a fourth differential pressure sensor, a fifth differential pressure sensor, a sixth differential pressure sensor, a seventh differential pressure sensor and a valve cavity, wherein the first differential pressure sensor and the second differential pressure sensor are respectively arranged at the air inlet end and the air outlet end of the first adsorption tower and the second adsorption tower; one end of the valve inner cavity is provided with a threaded hole, and one end of the valve core is arranged in the threaded hole in a threaded connection manner and extends out of the valve inner cavity to be connected with the stepping motor through a coupler; the valve inner cavity is also provided with two air vents communicated with the outside, and one air vent is detachably jacked and sealed at the other end of the valve core, and the oxygen production method is characterized by comprising the following steps: step 1, a first control valve is opened, a third control valve is closed, an air inlet is communicated with a first adsorption tower through the first control valve, and air flow charges air to the first adsorption tower through the air inlet; simultaneously, a fourth control valve is opened, a second control valve is closed, the second adsorption tower is vacuumized through a vacuum pump through a nitrogen discharge port, and gas in the second adsorption tower or waste gas in the last working cycle in the second adsorption tower is extracted; at this time, the fifth control valve, the sixth control valve and the seventh control valve are all kept closed;
step 2, after the first differential pressure sensor and the third differential pressure sensor detect that the pressure in the first adsorption tower meets the preset adsorption pressure Y1, opening a fifth control valve to supply oxygen to the oxygen storage tank;
The adsorption pressure Y1 refers to the pressure value of the first differential pressure sensor and the third differential pressure sensor or the pressure value of the second differential pressure sensor and the fourth differential pressure sensor, and meets the following conditions: the pressure values of the first differential pressure sensor and the third differential pressure sensor or the pressure values of the second differential pressure sensor and the fourth differential pressure sensor are all required to be within the optimal working pressure range of the molecular sieve arranged in the first adsorption tower or the second adsorption tower; the integral of the pressure difference between the first pressure difference sensor and the third pressure difference sensor or the integral of the pressure difference between the second pressure difference sensor and the fourth pressure difference sensor accords with the condition of normal oxygen production operation;
Step 3, after the pressures of the first differential pressure sensor and the third differential pressure sensor are increased to meet the preset adsorption pressure Y2, closing a fifth control valve;
the adsorption pressure Y2 refers to the pressure value of the first differential pressure sensor and the third differential pressure sensor or the pressure value of the second differential pressure sensor and the fourth differential pressure sensor, and meets the following conditions: the pressure values of the first differential pressure sensor and the third differential pressure sensor or the pressure values of the second differential pressure sensor and the fourth differential pressure sensor have tended to have an upper limit value of the operating pressure of the molecular sieve provided in the first adsorption column or the second adsorption column; the integral of the pressure difference of the first differential pressure sensor and the third differential pressure sensor or the integral of the pressure difference of the second differential pressure sensor and the fourth differential pressure sensor has a tendency to become larger gradually;
step 4, closing the first control valve, opening the third control valve, communicating the air inlet with the second adsorption tower through the third control valve, and inflating and pressurizing the second adsorption tower through the air inlet by air flow; simultaneously closing the fourth control valve, opening the second control valve, vacuumizing the first adsorption tower through the nitrogen discharge port by a vacuum pump, and extracting gas in the first adsorption tower or waste gas of the last working cycle in the second adsorption tower; at this time, the fifth control valve, the sixth control valve and the seventh control valve are all kept closed;
Step 5, after the second differential pressure sensor and the fourth differential pressure sensor detect that the pressure in the second adsorption tower meets the preset adsorption pressure Y1, opening a sixth control valve to supply oxygen to the oxygen storage tank;
Step 6, after the pressure of the second differential pressure sensor and the fourth differential pressure sensor is increased to meet the preset adsorption pressure Y2, closing the sixth control valve;
and 7, circularly executing the steps 1-6.
2. The method for producing oxygen by using the VPSA oxygen production module based on intelligent pressure control according to claim 1, wherein in the step 2, when the first differential pressure sensor and the third differential pressure sensor detect that the pressure in the first adsorption tower meets the predetermined adsorption pressure Y1, the seventh control valve is opened to blow back the second adsorption tower, then the seventh control valve is closed, the fifth control valve is opened, and oxygen is supplied to the oxygen storage tank.
3. The method according to claim 1, wherein in the step 3, after the pressures of the first differential pressure sensor and the third differential pressure sensor are increased to satisfy the predetermined adsorption pressure Y2, the fifth control valve is closed, the seventh control valve is opened to back-blow the second adsorption tower again, and then the seventh control valve is closed.
4. The oxygen generating method of the VPSA oxygen generating module based on intelligent pressure control according to claim 1, wherein in the step5, when the second differential pressure sensor and the fourth differential pressure sensor detect that the pressure in the second adsorption tower meets the predetermined adsorption pressure Y1, the seventh control valve is opened to blow back the first adsorption tower, then the seventh control valve is closed, the sixth control valve is opened, and oxygen is supplied to the oxygen storage tank.
5. The method according to claim 1, wherein in the step 6, after the pressure of the second differential pressure sensor and the fourth differential pressure sensor increases to satisfy the predetermined adsorption pressure Y2, the sixth control valve is closed, the seventh control valve is opened to back-blow the first adsorption tower again, and then the seventh control valve is closed.
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