Energy-saving and high-efficiency medical molecular sieve oxygen generator

Abstract

The application discloses an energy-saving and efficient medical molecular sieve oxygen generator, characterized in that: the energy-saving and efficient medical molecular sieve oxygen generator comprises N molecular sieve oxygen units, wherein N is greater than or equal to 3, a first gas inlet pipe of a first molecular sieve oxygen unit is provided with a gas inlet communication pipe, and a first gas outlet pipe of the first molecular sieve oxygen unit is provided with a gas outlet communication pipe. The purpose of the application is to overcome the shortcomings in the prior art, provide an energy-saving and efficient medical molecular sieve oxygen generator with simple structure, which can adjust the gas inlet amount according to the supply gas amount to reduce the compressed air consumption, and realize energy saving.

Description

Technical Field

[0001] This invention relates to the field of oxygen generator technology, specifically to an energy-efficient and high-performance medical molecular sieve oxygen generator. Background Technology

[0002] Medical molecular sieve oxygen generators employ PSA (Pressure Swing Adsorption) technology. Using air as raw material and molecular sieve as adsorbent, under normal temperature and low pressure conditions, the molecular sieve's adsorption capacity for nitrogen (adsorbate) in the air increases when pressurized and decreases when depressurized, forming a rapid cycle of pressurized adsorption and depressurized desorption. This allows oxygen and nitrogen in the air to be separated to produce oxygen.

[0003] The current oxygen concentrator's output is affected by the pressure difference between the adsorption tower and the exhaust port. A significant amount of gas is consumed to raise the pressure in the adsorption tower from 0 to above the exhaust port pressure. As the pressure difference between the adsorption tower and the exhaust port decreases, the oxygen concentrator's output decreases, but the amount of compressed air decreases proportionally. When the oxygen concentrator's output is less than 10% of its nominal value, the amount of air consumed only decreases by no more than 7.8%. Therefore, excessive compressed air consumption occurs when the oxygen concentrator is not operating at full capacity, resulting in high energy consumption. Medical units configure medical molecular sieve oxygen concentrators based on peak gas consumption, leading to overcapacity during off-peak hours, resulting in excessive compressed air consumption and excessively high energy consumption.

[0004] Therefore, existing molecular oxygen generators need further improvement. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an energy-efficient medical molecular sieve oxygen generator with a simple structure that can adjust the intake volume according to the supply volume to reduce compressed air consumption and achieve energy saving.

[0006] To achieve the above objectives, the present invention adopts the following solution: an energy-saving and high-efficiency medical molecular sieve oxygen generator, characterized in that: it includes N molecular sieve oxygen generating units, wherein N≥3, each molecular sieve oxygen generating unit includes a first molecular sieve adsorption tank and a second molecular sieve adsorption tank, the lower end of the first molecular sieve adsorption tank is connected to a compressed air intake pipe through a first air inlet pipe, the lower end of the second molecular sieve adsorption tank is connected to a compressed air intake pipe through a second air inlet pipe, a first solenoid valve is provided on the first air inlet pipe, a first exhaust pipe is provided on the first air inlet pipe between the air inlet end of the first molecular sieve adsorption tank and the first solenoid valve, a first nitrogen discharge valve is provided on the exhaust end of the first exhaust pipe, a second solenoid valve is provided on the second air inlet pipe, and a second nitrogen discharge valve is provided on the second solenoid valve between the air inlet end of the second molecular sieve adsorption tank and the second solenoid valve. A second exhaust pipe is provided on the inlet pipe, and a second nitrogen venting valve is provided at the outlet end of the second exhaust pipe. A first outlet pipe is provided at the upper end of the first molecular sieve adsorption tank, and a first one-way valve is provided on the first outlet pipe. A second outlet pipe is provided at the upper end of the second molecular sieve adsorption tank, and a second one-way valve is provided on the second outlet pipe. The second outlet pipe is connected to an oxygen outlet pipe. A connecting pipe is provided between the first outlet pipe at the inlet end of the first one-way valve and the second outlet pipe at the inlet end of the second one-way valve. A third solenoid valve is provided on the connecting pipe. An inlet connecting pipe is provided between the first inlet pipe of the first molecular sieve oxygen generating unit and the first inlet pipe of the Nth molecular sieve oxygen generating unit. An outlet connecting pipe is provided between the first outlet pipe of the first molecular sieve oxygen generating unit and the first outlet pipe of the Nth molecular sieve oxygen generating unit.

[0007] As another improvement to the energy-saving and efficient medical molecular sieve oxygen generator of the present invention, a pressure detector is provided on the main outlet end of the oxygen outlet pipe. The pressure detector is connected to the controller. The first solenoid valve, the second solenoid valve, the third solenoid valve, the first nitrogen discharge valve, the second nitrogen discharge valve, the first check valve, and the second check valve are respectively connected to the controller.

[0008] As another improvement to the energy-efficient medical molecular sieve oxygen generator of this invention, the gas production capacity of each oxygen generating unit is 2-8 Nm³. 3 / h.

[0009] As another improvement to the energy-saving and efficient medical molecular sieve oxygen generator of the present invention, the oxygen generating unit consists of three units.

[0010] This invention discloses an energy-saving control method for an oxygen generator, characterized by comprising the following steps:

[0011] S1. Real-time acquisition of the pressure at the output end of each molecular sieve oxygen generation unit;

[0012] S2. Calculate the pressure change trend through an internal algorithm to determine whether the current oxygen production meets the gas supply demand; if the oxygen production is greater than the gas supply demand and the gas pressure at the output end of the molecular sieve oxygen generator is greater than the set threshold, execute step S3; if the oxygen production is less than the gas supply demand and the gas pressure at the output end of the molecular sieve oxygen generator is less than the set threshold, execute step S4;

[0013] S3. Control the molecular sieve oxygen generation unit with the longest running time to stop working;

[0014] S4. Start the molecular sieve oxygen generation unit with the shortest running time to increase the oxygen production of the oxygen generator to meet the gas supply demand.

[0015] As another improvement of the oxygen generator energy-saving control method of the present invention, the internal algorithm includes the following steps:

[0016] S1. When P is less than P r All the molecular sieve oxygen generation units (100) are started;

[0017] S2. When P s > P ≥ P r And B > 1, stop the molecular sieve oxygen generation unit (100) with the longest running time;

[0018] S3. When P ≥ P s And B > 0, stop all the molecular sieve oxygen generation units (100);

[0019] S4. When P s > P ≥ P r And -1 < B < 0, start the molecular sieve oxygen generation unit (100) with the shortest running time;

[0020] S5. When P s > P ≥ P r And B < -1, start all the molecular sieve oxygen generation units (100);

[0021] Where: P: The real-time pressure at the output port of the molecular sieve oxygen generator;

[0022] P r : The pressure threshold for starting the molecular sieve oxygen generator;

[0023] P s The pressure threshold for stopping the molecular sieve oxygen generator;

[0024]

[0025] B: The control coefficient of the molecular sieve oxygen generation unit;

[0026] P △ : The pressure change difference at the output port of the molecular sieve oxygen generator, unit: Pa;

[0027] V: Volume of the oxygen buffer tank connected to the output port of the molecular sieve oxygen generator, unit: m³ 3 .

[0028] In summary, the advantages of this invention compared to existing technologies are: the oxygen generator of this invention can automatically adjust its gas production according to the gas supply demand. The oxygen generator automatically adjusts its compressed air consumption according to the gas production volume, thereby reducing the energy consumption of the oxygen generator. Attached Figure Description

[0029] Figure 1 This is one of the three-dimensional schematic diagrams of the oxygen generator of the present invention.

[0030] Figure 2 This is the second three-dimensional schematic diagram of the oxygen generator of the present invention.

[0031] In the diagram: 1. Compressed air inlet pipe; 2. First solenoid valve; 3. Second solenoid valve; 4. First nitrogen purging valve; 5. Second nitrogen purging valve; 6. First molecular sieve adsorption tank; 7. Second molecular sieve adsorption tank; 8. Third solenoid valve; 9. First check valve; 10. Second check valve; 11. Oxygen outlet pipe; 12. First inlet pipe; 13. Second inlet pipe; 14. First exhaust pipe; 15. Second exhaust pipe; 16. First outlet pipe; 17. Second outlet pipe; 18. Connecting pipe; 19. Pressure detector; 20. Controller; 100. Molecular sieve oxygen generation unit. Detailed Implementation

[0032] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0033] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] See Figure 1-2 This invention discloses an energy-efficient medical molecular sieve oxygen generator, characterized by comprising N molecular sieve oxygen generating units 100, wherein N≥3. Each molecular sieve oxygen generating unit 100 includes a first molecular sieve adsorption tank 6 and a second molecular sieve adsorption tank 7. The lower end of the first molecular sieve adsorption tank 6 is connected to a compressed air intake pipe 1 via a first air inlet pipe 12, and the lower end of the second molecular sieve adsorption tank 7 is connected to the compressed air intake pipe 1 via a second air inlet pipe 13. A first solenoid valve 2 is provided on the first air inlet pipe 12. A first exhaust pipe 14 is provided on the first air inlet pipe 12 between the air inlet end of the first molecular sieve adsorption tank 6 and the first solenoid valve 2. A first nitrogen discharge valve 4 is provided on the air outlet end of the first exhaust pipe 14. A second solenoid valve 3 is provided on the second air inlet pipe 13. A second exhaust pipe 15 is provided on the second air inlet pipe 13 between the air inlet end of the second molecular sieve adsorption tank 7 and the second solenoid valve 3. A second nitrogen discharge valve 5 is provided at the outlet end of the exhaust pipe 15. A first outlet pipe 16 is provided at the upper end of the first molecular sieve adsorption tank 6. A first one-way valve 9 is provided on the first outlet pipe 16. A second outlet pipe 17 is provided at the upper end of the second molecular sieve adsorption tank 7. A second one-way valve 10 is provided on the second outlet pipe 17. The second outlet pipe 17 is connected to the oxygen outlet pipe 11. A connecting pipe 18 is provided between the first outlet pipe 16 at the inlet end of the first one-way valve 9 and the second outlet pipe 17 at the inlet end of the second one-way valve 10. A third solenoid valve 8 is provided on the connecting pipe 18. An inlet connecting pipe 18 is provided between the first inlet pipe 12 of the first molecular sieve oxygen generating unit 100 and the first inlet pipe 12 of the Nth molecular sieve oxygen generating unit 100. An outlet connecting pipe 18 is provided between the first outlet pipe 16 of the first molecular sieve oxygen generating unit 100 and the first outlet pipe 16 of the Nth molecular sieve oxygen generating unit 100.

[0037] In this invention, the first molecular sieve adsorption tank 6 and the second molecular sieve adsorption tank 7 have the same structure, including an adsorption tank body, and molecular sieves are filled in the adsorption tank body to achieve oxygen and nitrogen separation.

[0038] The oxygen generation process of the molecular sieve oxygen generation unit 100 of this invention is as follows: First half of the cycle: Oxygen generation in the first molecular sieve adsorption tank 6 and nitrogen discharge in the second molecular sieve adsorption tank 7: Open the first solenoid valve 2 and the second nitrogen discharge valve 5, while simultaneously closing the second solenoid valve 3, the first nitrogen discharge valve 4, and the third solenoid valve 8; Compressed air begins to enter the first molecular sieve adsorption tank 6. When the gas pressure inside the first molecular sieve adsorption tank 6 is greater than the pressure in the oxygen outlet pipe 11, the oxygen generator produces gas; Nitrogen is discharged from the second molecular sieve adsorption tank 7 through the second nitrogen discharge valve 5; After the first molecular sieve adsorption tank 6 has finished its intake time, the first solenoid valve 2 and the second nitrogen discharge valve 5 are closed, while the third solenoid valve 8 is opened, and oxygen is generated in the first molecular sieve adsorption tank 6 and the second molecular sieve adsorption tank 7. The gas pressure in molecular sieve adsorption tank 7 is balanced; Second half of the cycle: Nitrogen is discharged from the first molecular sieve adsorption tank 6, and oxygen is generated from the second molecular sieve adsorption tank 7: the second solenoid valve 3 and the first nitrogen discharge valve 4 are opened, while the first solenoid valve 2, the second nitrogen discharge valve 5, and the third solenoid valve 8 are closed; compressed air begins to enter the second molecular sieve adsorption tank 7. When the gas pressure in the second molecular sieve adsorption tank 7 is greater than the pressure in the oxygen outlet pipe 11, the oxygen generator produces gas; nitrogen is discharged from the first molecular sieve adsorption tank 6 through the first nitrogen discharge valve 4; after the gas intake time of the second molecular sieve adsorption tank 7 is completed, the second solenoid valve 3 and the first nitrogen discharge valve 4 are closed, while the third solenoid valve 8 is opened, and the gas pressure in the first molecular sieve adsorption tank 6 and the second molecular sieve adsorption tank 7 is balanced.

[0039] In this invention, the compressed air inlet is connected end-to-end with the inlet of the last molecular sieve oxygen generating unit, ensuring that the inlet pressure and flow rate of each molecular sieve oxygen generating unit are basically the same under operating conditions. The outlet of the molecular sieve oxygen generating unit 100 is connected end-to-end with the outlet of the last molecular sieve oxygen generating unit, ensuring that the exhaust pressure of each molecular sieve oxygen generating unit is basically the same under operating conditions.

[0040] Reference Figure 2 In this invention, a pressure detector 19 is provided at the main outlet end of the oxygen outlet pipe. The pressure detector 19 is connected to a controller 20. The first solenoid valve 2, the second solenoid valve 3, the third solenoid valve 8, the first nitrogen purging valve 4, the second nitrogen purging valve 5, the first one-way valve 9, and the second one-way valve 10 are respectively connected to the controller 20. In this invention, the molecular sieve oxygen generator is divided into multiple units, the inlet pipe structure and the outlet pipe are optimized, and a highly efficient control process is used. Based on the multi-stage parallel adsorption tower unit combination technology, the intake air volume is adjusted according to the supply air volume to reduce the compressed air consumption and achieve energy saving.

[0041] The oxygen generator's control system monitors the pressure changes in the oxygen outlet pipe 11 in real time, and starts and stops the molecular sieve oxygen generating unit accordingly. When the gas consumption changes to a threshold, the operating status of the molecular sieve oxygen generating unit is changed. During off-peak oxygen consumption, the demand for oxygen decreases, and the oxygen generator stops the corresponding molecular sieve oxygen generating unit based on the gas supply demand, reducing compressed air consumption and thus lowering energy consumption.

[0042] In one embodiment of the present invention, the oxygen production capacity of each oxygen generation unit is 5 Nm 3 / h. There are 3 oxygen generation units. That is, the rated oxygen production capacity of the oxygen generator is 15 Nm 3 / h.

[0043] The energy-saving control method of the oxygen generator of the present invention includes the following steps:

[0044] S1. Real-time collect the pressure at the output end of each molecular sieve oxygen generation unit 100;

[0045] S2. Judge whether the current oxygen production capacity meets the air supply demand by calculating the pressure change trend through an internal algorithm; if the oxygen production capacity is greater than the air supply demand and the gas pressure at the output end of each molecular sieve oxygen generation unit 100 is greater than the set threshold, execute step S3; if the oxygen production capacity is less than the air supply demand and the gas pressure at the output end of each molecular sieve oxygen generation unit 100 is less than the set threshold, execute step S4;

[0046] S3. Control the molecular sieve oxygen generation unit 100 with the longest running time to stop working, so as to reduce the consumption of compressed air;

[0047] S4. Start the molecular sieve oxygen generation unit with the shortest running time to increase the oxygen production capacity of the oxygen generator to meet the air supply demand.

[0048] The internal algorithm includes the following steps:

[0049] S1. When P is less than P r , all the molecular sieve oxygen generation units (100) are started;

[0050] S2. When P s > P ≥ P r and B > 1, stop the molecular sieve oxygen generation unit (100) with the longest running time;

[0051] S3. When P ≥ P s and B > 0, stop all the molecular sieve oxygen generation units (100);

[0052] S4. When P s > P ≥ P r and -1 < B < 0, start the molecular sieve oxygen generation unit (100) with the shortest running time;

[0053] S5. When P s > P ≥ P r and B < -1, start all the molecular sieve oxygen generation units (100);

[0054] Where: P: The real-time pressure at the output port of the molecular sieve oxygen generator;

[0055] [[ID=6"0]]Pr The pressure threshold for starting a molecular sieve oxygen generator;

[0056] P s The pressure threshold for stopping a molecular sieve oxygen generator;

[0057]

[0058] B: Control coefficient of molecular sieve oxygen generation unit;

[0059] P △ Pressure difference at the output port of the molecular sieve oxygen generator, unit: Pa;

[0060] V: Volume of the oxygen buffer tank connected to the output port of the molecular sieve oxygen generator, unit: m³ 3 .

[0061] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving control method for an energy-efficient medical molecular sieve oxygen generator, characterized in that... The energy-efficient medical molecular sieve oxygen generator includes N molecular sieve oxygen generating units (100), where N≥3. The energy-saving control method includes the following steps: S1. Real-time acquisition of the pressure at the output end of the molecular sieve oxygen generation unit (100); S2. Calculate the pressure change trend using an internal algorithm to determine whether the current gas production meets the gas supply demand. If the gas production is greater than the gas supply demand and the gas pressure at the output end of the molecular sieve oxygen generator is greater than the set threshold, proceed to step S3. If the gas production is less than the gas supply demand and the gas pressure at the output end of the molecular sieve oxygen generator is less than the set threshold, proceed to step S4. S3. Control the molecular sieve oxygen generation unit (100) with the longest operating time to stop working; S4. Start the molecular sieve oxygen generating unit with the shortest start-up time to increase the gas production of the oxygen generator to meet the gas supply demand. The internal algorithm includes the following steps: S1, when P is less than P r At that time, all molecular sieve oxygen generating units (100) are started; S2, when P s >P≥P r And when B>1, the molecular sieve oxygen generation unit with the longest shutdown time (100). S3, when P≥P s When B>0, all molecular sieve oxygen generation units (100) are stopped. S4. When P s > P ≥ P r and -1 < B < 0, start the molecular sieve oxygen generation unit (100) with the shortest running time; S5, when P s >P≥P r When B < -1, all molecular sieve oxygen generating units (100) are started and running. Where: P: Real-time pressure at the output port of the molecular sieve oxygen generator; P r The pressure threshold for starting a molecular sieve oxygen generator; P s The pressure threshold for stopping a molecular sieve oxygen generator; ； B: Control coefficient of molecular sieve oxygen generation unit; P △ Pressure difference at the output port of the molecular sieve oxygen generator, unit: Pa; V: Volume of the oxygen buffer tank connected to the output port of the molecular sieve oxygen generator, unit: m³ 3 .

2. The energy-saving control method for an energy-efficient medical molecular sieve oxygen generator according to claim 1, characterized in that... The molecular sieve oxygen generation unit (100) includes a first molecular sieve adsorption tank (6) and a second molecular sieve adsorption tank (7). The lower end of the first molecular sieve adsorption tank (6) is connected to the compressed air intake pipe (1) through a first air inlet pipe (12), and the lower end of the second molecular sieve adsorption tank (7) is connected to the compressed air intake pipe (1) through a second air inlet pipe (13). A first solenoid valve (2) is provided on the first air inlet pipe (12), and the first molecular sieve adsorption tank (6) is connected to the compressed air intake pipe (1) through a second air inlet pipe (13). A first exhaust pipe (14) is provided on the first air inlet pipe (12) between the first solenoid valve (2), and a first nitrogen discharge valve (4) is provided on the outlet end of the first exhaust pipe (14). A second solenoid valve (3) is provided on the second air inlet pipe (13), and a second exhaust pipe (15) is provided on the second air inlet pipe (13) between the air inlet end of the second molecular sieve adsorption tank (7) and the second solenoid valve (3). A second nitrogen discharge valve (5) is provided on the outlet end of the second exhaust pipe (15). The upper end of the molecular sieve adsorption tank (6) is provided with a first outlet pipe (16), and a first one-way valve (9) is provided on the first outlet pipe (16). The upper end of the second molecular sieve adsorption tank (7) is provided with a second outlet pipe (17), and a second one-way valve (10) is provided on the second outlet pipe (17). The second outlet pipe (17) is connected to the oxygen outlet pipe (11). The first outlet pipe (16) at the inlet end of the first one-way valve (9) and the second outlet pipe (10) at the inlet end of the second one-way valve (10) are connected to the oxygen outlet pipe (11). A connecting pipe (18) is provided between the trachea (17), and a third solenoid valve (8) is provided on the connecting pipe (18). An air inlet connecting pipe (18) is provided between the first air inlet pipe (12) of the first molecular sieve oxygen generating unit (100) and the first air inlet pipe (12) of the Nth molecular sieve oxygen generating unit (100). An air outlet connecting pipe (18) is provided between the first air outlet pipe (16) of the first molecular sieve oxygen generating unit (100) and the first air outlet pipe (16) of the Nth molecular sieve oxygen generating unit (100).

3. The energy-saving control method for an energy-efficient medical molecular sieve oxygen generator according to claim 1, characterized in that... A pressure detector (19) is provided on the main outlet end of the oxygen outlet pipe. The pressure detector (19) is connected to the controller (20). The first solenoid valve (2), the second solenoid valve (3), the third solenoid valve (8), the first nitrogen discharge valve (4), the second nitrogen discharge valve (5), the first check valve (9), and the second check valve (10) are respectively connected to the controller (20).

4. The energy-saving control method for an energy-efficient medical molecular sieve oxygen generator according to claim 1, characterized in that... Each oxygen production unit produces 2-8 Nm³ of gas. 3 / h.

5. The energy-saving control method for an energy-efficient medical molecular sieve oxygen generator according to claim 1, characterized in that... The oxygen generation unit consists of three units.

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