Magnetic suspension type vacuum pressure swing adsorption oxygen production equipment

Abstract

The invention discloses magnetic suspension type vacuum pressure swing adsorption oxygen production equipment which comprises a magnetic suspension blower, a heat exchanger, a magnetic suspension vacuum pump, a recovery storage tank, a second adsorption tower, an oxygen buffer tank, an oxygen supercharger, a switching mechanism and an instrument mechanism, the switching mechanism comprises a pneumatic switch valve group, a manual switch valve group and a pneumatic control valve group, and the instrument mechanism comprises a pressure sensor group, a temperature sensor group, an oxygen purity analyzer and an oxygen flow meter. According to the invention, the frequency of the magnetic suspension blower and the magnetic suspension vacuum pump can be adjusted according to the air load to reduce the energy consumption of the system, the brake energy of the magnetic suspension blower and the magnetic suspension vacuum pump is recovered to improve the energy utilization efficiency and the system performance, and the pneumatic control valve group is adopted to accurately control the regeneration flow and the regeneration time. The molecular sieve utilization efficiency is improved, the system energy consumption is reduced again, the energy consumption can be greatly reduced, and the yield is improved.

Description

Technical Field

[0001] The invention relates to the technical field of air separation equipment, in particular to a magnetic suspension type vacuum pressure swing adsorption oxygen production equipment. Background Art

[0002] The working principle of vacuum pressure swing adsorption oxygen production is that air is sent by a blower into an adsorption tower filled with zeolite molecular sieve adsorbent. It enters the adsorbent layer evenly, and N2, H2O and a small amount of O2 are adsorbed. The product O2 is enriched and enters the buffer unit. After a period of time, when the adsorption tower is saturated with adsorption, the gas is recovered at equal pressure and the pressure is reduced by a vacuum pump to regenerate. At this time, the remaining adsorption towers are switched to continue working. The adsorption unit consists of two or three towers. Under the control of the PLC or DCS system, the programmable valve switches to control the alternating cycle of adsorption and regeneration, and continuously outputs the product O2. The adsorption layer is mainly composed of desiccant, zeolite molecular sieve, etc. The current inverter has certain problems when working. The motor in the factory often needs to accelerate and decelerate when working. When the motor decelerates, the motor is in a power generation state. At this time, the motor feeds back electrical energy to the DC bus side of the inverter, causing the DC bus voltage to increase. In the known technology, when the DC bus voltage is too high, the energy consumption braking method is used, and an external resistor is used to convert excess electrical energy into heat and dissipate it into the air, wasting a lot of energy and increasing carbon emissions. In addition, the existing equipment has high energy consumption and requires a lot of cost to use. For this reason, a magnetic levitation vacuum pressure swing adsorption oxygen production equipment is proposed. Summary of the invention

[0003] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0004] To this end, the technical solution adopted in the present invention is:

[0005] A magnetic levitation vacuum pressure swing adsorption oxygen production equipment, including a magnetic levitation blower, a heat exchanger, a magnetic levitation vacuum pump, a recovery storage tank, a second adsorption tower, a second adsorption tower, an oxygen buffer tank, an oxygen booster, a switching mechanism and an instrument mechanism, the switching mechanism includes a pneumatic switch valve group, a manual switch valve group and a pneumatic regulating valve group, the pneumatic switch valve group includes a first pneumatic switch valve, a second pneumatic switch valve, a third pneumatic switch valve, a fourth pneumatic switch valve, a fifth pneumatic switch valve, a sixth pneumatic switch valve, a seventh pneumatic switch valve, an eighth pneumatic switch valve, a ninth pneumatic switch valve, a tenth pneumatic switch valve, an eleventh pneumatic switch valve and a twelfth pneumatic switch valve, the opening and closing of the pipeline is controlled by a cylinder, and the manual switch valve group includes a first manual switch The pneumatic control valve group includes a first pneumatic control valve, a second pneumatic control valve and a third pneumatic control valve, which are used to control the flow rate of the pipeline. The pressure sensor group includes a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor and a fifth pressure sensor, which are used to monitor the pressure of the pipeline, and the pressure sensor group is installed at the air outlet of each structure. The temperature sensor group includes a first temperature sensor, a second temperature sensor and a third temperature sensor, which are used to monitor the temperature of the pipeline. The instrument mechanism includes a pressure sensor group, a temperature sensor group, an oxygen purity analyzer and Oxygen flow meter, the magnetic levitation blower is directly connected to the heat exchanger, and a first pressure sensor and a first temperature sensor are arranged on the connecting pipeline between the magnetic levitation blower and the heat exchanger, and a second temperature sensor is arranged on the output pipeline of the heat exchanger, the output pipeline end of the heat exchanger is respectively connected with the first adsorption tower, the second adsorption tower and the magnetic levitation vacuum pump, and the output pipeline is provided with a first pneumatic switch valve, a second pneumatic switch valve, a third pneumatic switch valve, a fourth pneumatic switch valve, a first manual switch valve, a second manual switch valve, a fifth pneumatic switch valve, a sixth pneumatic switch valve, a seventh pneumatic switch valve, an eighth pneumatic switch valve, a third manual switch valve and a fourth manual switch valve, the recovery storage tank is connected to the first adsorption tower and On the recovery pipeline of the second adsorption tower, the ends of the discharge pipelines of the first adsorption tower and the second adsorption tower are connected to the oxygen buffer tank, and the discharge pipeline is provided with a symmetrically arranged third pressure sensor and fourth pressure sensor, a second temperature sensor and a third temperature sensor, a ninth pneumatic switch valve and a first pneumatic regulating valve, and a tenth pneumatic switch valve and an eleventh pneumatic switch valve, and the rear section of the discharge pipeline is provided with a twelfth pneumatic switch valve and a second pneumatic regulating valve in series, the other side of the oxygen buffer tank is connected to the oxygen booster, and the rear end of the oxygen booster is connected to an oxygen flow meter, the output port of the oxygen flow meter is connected to a user pipeline and an unqualified pipeline, and the user pipeline is provided with a fifth pressure sensor, a fourth pneumatic regulating valve and a one-way valve,The unqualified pipeline is provided with a third pneumatic regulating valve and a fifth manual switch valve.

[0006] Preferably, the other end of the magnetic levitation vacuum pump is connected to an exhaust muffler, and a second pressure sensor is provided on the output pipeline between the magnetic levitation vacuum pump and the heat exchanger.

[0007] Preferably, the magnetic suspension blower is a variable torque load, and its pressure, shaft power and flow rate satisfy the following relationship:

[0008] The flow rate and the speed are in direct proportion, the pressure and the square of the speed are in direct proportion, and the shaft power and the cube of the speed are in direct proportion. Therefore, if the speed of the motor decreases, its shaft power will decrease significantly.

[0009] For example, when the flow is 75% of the loading flow, the shaft power will drop to 49% of the rated power.

[0010] Preferably, the pressure sensor group is installed at the air outlet to obtain the required current signal, and the specific relationship is as follows:

[0011] If the gas consumption decreases, the pressure increases, and if the gas consumption increases, the pressure decreases.

[0012] Preferably, the first adsorption tower and the second adsorption tower are operated alternately.

[0013] Preferably, only one of the tenth pneumatic switch valve and the eleventh pneumatic switch valve is opened at the same time, and when the tenth pneumatic switch valve and the eleventh pneumatic switch valve are both closed, the ninth pneumatic switch valve and the first pneumatic regulating valve are opened.

[0014] Preferably, a water leakage alarm is connected to the heat exchanger.

[0015] Preferably, a third manual switch valve and a fourth manual switch valve are respectively provided on the air inlets of the first adsorption tower and the second adsorption tower.

[0016] Preferably, the output pipeline of the heat exchanger is provided with a branch pipeline of the seventh pneumatic switch valve and the eighth pneumatic switch valve for connecting the first adsorption tower and the second adsorption tower, and the branch pipeline is connected to the recovery storage tank.

[0017] Preferably, the one-way valve, the fifth pressure sensor and the fourth pneumatic regulating valve are connected in series on the user pipeline, and the one-way valve controls the gas to move only toward the user pipeline outlet.

[0018] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0019] 1. In the present invention, the frequency of the magnetic levitation blower and the magnetic levitation vacuum pump can be adjusted according to the gas load through the pneumatic switch valve group and the manual switch valve group in conjunction with the pneumatic regulating valve group to reduce the system energy consumption, and at the same time, the braking energy of the magnetic levitation blower and the magnetic levitation vacuum pump is recovered to improve the energy utilization efficiency and system performance, and the pneumatic regulating valve group is used to accurately control the regeneration flow and regeneration time to improve the utilization efficiency of the molecular sieve and reduce the system energy consumption again, thereby achieving a significant reduction in energy consumption and an increase in production.

[0020] 2. In the present invention, when the first adsorption tower and the second adsorption tower are performing the pressure equalization step of alternating operation, restarting the magnetic suspension blower to increase the pressure of the first adsorption tower and the second adsorption tower can reduce the consumption of compressed air, and at the same time speed up the pressure increase time and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of device connection according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a working process of an embodiment of the present invention;

[0023] Figure 3 The figure is a schematic diagram of the principle flow of an embodiment of the present invention.

[0024] Reference numerals:

[0025] 1. Magnetic levitation blower; 2. First pressure sensor; 3. First temperature sensor; 4. Heat exchanger; 5. Water leakage alarm; 6. Second temperature sensor; 7. Magnetic levitation vacuum pump; 8. Emptying muffler; 9. Second pressure sensor; 10. First pneumatic switch valve; 11. Second pneumatic switch valve; 12. Third pneumatic switch valve; 13. Fourth pneumatic switch valve; 14. First manual switch valve; 15. Second manual switch valve; 16. Recovery storage tank; 17. Fifth pneumatic switch valve; 18. Sixth pneumatic switch valve; 19. Seventh pneumatic switch valve; 20. Eighth pneumatic switch valve; 21. Third manual switch valve; 22. Fourth manual switch Valve; 23. First adsorption tower; 24. Second adsorption tower; 25. Third pressure sensor; 26. Second temperature sensor; 27. Fourth pressure sensor; 28. Third temperature sensor; 29. ​​Ninth pneumatic switch valve; 30. First pneumatic regulating valve; 31. Tenth pneumatic switch valve; 32. Eleventh pneumatic switch valve; 33. Twelfth pneumatic switch valve; 34. Second pneumatic regulating valve; 35. Oxygen buffer tank; 36. Oxygen purity analyzer; 37. Oxygen booster; 38. Oxygen flow meter; 39. Third pneumatic regulating valve; 40. Fifth manual switch valve; 41. Fifth pressure sensor; 42. Fourth pneumatic regulating valve; 43. One-way valve. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0027] A magnetic suspension vacuum pressure swing adsorption oxygen production equipment provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0028] Embodiment 1:

[0029] Combination Figure 1-3As shown, a magnetic suspension vacuum pressure swing adsorption oxygen production equipment provided by the present invention includes a magnetic suspension blower 1, a heat exchanger 4, a magnetic suspension vacuum pump 7, a recovery storage tank 16, a second adsorption tower 24, a second adsorption tower 24, an oxygen buffer tank 35, an oxygen booster 37 and a switching mechanism and an instrument mechanism. The switching mechanism includes a pneumatic switch valve group, a manual switch valve group and a pneumatic regulating valve group. The pneumatic switch valve group includes a first pneumatic switch valve 10, a second pneumatic switch valve 11, a third pneumatic switch valve 12, a fourth pneumatic switch valve 13, a fifth pneumatic switch valve 17, a sixth pneumatic switch valve 18, a seventh pneumatic switch valve 19, an eighth pneumatic switch valve 20, a ninth pneumatic switch valve 29, a tenth pneumatic switch valve 31, an eleventh pneumatic switch valve 32 and a second pneumatic switch valve 33. and a twelfth pneumatic switch valve 33, which controls the opening and closing of the pipeline through the cylinder. The manual switch valve group includes a first manual switch valve 14, a second manual switch valve 15, a third manual switch valve 21, a fourth manual switch valve 22 and a fifth manual switch valve 40, which are used to manually control the opening and closing of the pipeline. The pneumatic regulating valve group includes a first pneumatic regulating valve 30, a second pneumatic regulating valve 34 and a third pneumatic regulating valve 39, which are used to control the flow rate of the pipeline. The pressure sensor group includes a first pressure sensor 2, a second pressure sensor 9, a third pressure sensor 25, a fourth pressure sensor 27 and a fifth pressure sensor 41, which are used to monitor the pressure of the pipeline, and the pressure sensor groups are installed at the air outlet of each structure. The temperature sensor group includes a first temperature sensor 3, a second temperature sensor 4, a third temperature sensor 5 and a fourth temperature sensor 6. The temperature sensor 26 and the third temperature sensor 28 are used to monitor the temperature of the pipeline. The instrument mechanism includes a pressure sensor group, a temperature sensor group, an oxygen purity analyzer 36 and an oxygen flow meter 38. The magnetic suspension blower 1 is directly connected to the heat exchanger 4, and the first pressure sensor 2 and the first temperature sensor 3 are arranged on the connecting pipeline between the magnetic suspension blower 1 and the heat exchanger 4. The heat exchanger 4 is connected to a water leakage alarm 5, and the output pipeline of the heat exchanger 4 is provided with a second temperature sensor 6. The end of the output pipeline of the heat exchanger 4 is respectively connected to the first adsorption tower 23, the second adsorption tower 24 and the magnetic suspension vacuum pump 7. The other end of the magnetic suspension vacuum pump 7 is connected to an emptying muffler 8, and the output between the magnetic suspension vacuum pump 7 and the heat exchanger 4 is connected to the first adsorption tower 23, the second adsorption tower 24 and the magnetic suspension vacuum pump 7. A second pressure sensor 9 is provided on the outlet pipeline, and a first pneumatic switch valve 10, a second pneumatic switch valve 11, a third pneumatic switch valve 12, a fourth pneumatic switch valve 13, a first manual switch valve 14, a second manual switch valve 15, a fifth pneumatic switch valve 17, a sixth pneumatic switch valve 18, a seventh pneumatic switch valve 19, an eighth pneumatic switch valve 20, a third manual switch valve 21 and a fourth manual switch valve 22 are provided on the output pipeline. The recovery storage tank 16 is connected to the recovery pipeline of the first adsorption tower 23 and the second adsorption tower 24. The output pipeline of the heat exchanger 4 is provided with a branch pipeline of the seventh pneumatic switch valve 19 and the eighth pneumatic switch valve 20 for connecting the first adsorption tower 23 and the second adsorption tower 24, and the branch pipeline is connected to the recovery storage tank 16.The third manual switch valve 21 and the fourth manual switch valve 22 are respectively arranged on the air inlets of the first adsorption tower 23 and the second adsorption tower 24. The ends of the discharge pipelines of the first adsorption tower 23 and the second adsorption tower 24 are connected to the oxygen buffer tank 35. The discharge pipelines are symmetrically provided with the third pressure sensor 25 and the fourth pressure sensor 27, the second temperature sensor 26 and the third temperature sensor 28, the ninth pneumatic switch valve 29 and the first pneumatic regulating valve 30, and the tenth pneumatic switch valve 31 and the eleventh pneumatic switch valve 32. The rear section of the discharge pipeline is serially provided with the twelfth pneumatic switch valve 33 and the second pneumatic regulating valve 34. The other side of the oxygen buffer tank 35 is connected to the oxygen booster 37, and the oxygen booster 37 The rear end is connected to an oxygen flow meter 38, the output port of the oxygen flow meter 38 is connected to the user pipeline and the unqualified pipeline, the user pipeline is provided with a fifth pressure sensor 41, a fourth pneumatic regulating valve 42 and a one-way valve 43, the unqualified pipeline is provided with a third pneumatic regulating valve 39 and a fifth manual switch valve 40, the tenth pneumatic switch valve 31 and the eleventh pneumatic switch valve 32 will only open one at the same time, and when the tenth pneumatic switch valve 31 and the eleventh pneumatic switch valve 32 are both closed, the ninth pneumatic switch valve 29 and the first pneumatic regulating valve 30 are opened, the one-way valve 43 is connected in series with the fifth pressure sensor 41 and the fourth pneumatic regulating valve 42 on the user pipeline, and the one-way valve 43 controls the gas to move only toward the user pipeline outlet.

[0030] Among them, the magnetic suspension blower 1 belongs to a variable torque load, and its pressure, shaft power and flow rate satisfy the following relationship:

[0031] The flow rate and the speed are in direct proportion, the pressure and the square of the speed are in direct proportion, and the shaft power and the cube of the speed are in direct proportion. Therefore, if the speed of the motor decreases, its shaft power will decrease significantly.

[0032] For example, when the flow rate is 75% of the loading flow rate, the shaft power will drop to 49% of the rated power. Based on this principle, the idea of ​​frequency conversion control design for the magnetic suspension blower 1 and the magnetic suspension vacuum pump 7 can be obtained;

[0033] The specific operation is as follows: the required current signal is obtained by installing a pressure sensor group at the outlet of the fan. If the gas consumption of the system decreases, the outlet pressure of the oxygen booster 37 will increase, and the resistance of the corresponding pressure sensor group will decrease. The resistance of the pressure sensor group can be converted into a corresponding current signal through a 24V DC power supply, thereby increasing its input signal to the frequency converter. Finally, the deviation is obtained by comparing with the preset value to reduce the frequency of the frequency converter to adjust the output power supply. At this time, the speed of the motor and the compressor can be reduced, and the exhaust volume can be reduced at the same time.

[0034] When the gas consumption of the system increases, its overall pressure will gradually decrease. At this time, the power frequency output by the inverter will gradually increase, thereby increasing the speed and exhaust volume of the motor. At this time, the inverter can be used to adjust the speed to meet the gas consumption requirements of the system. When the adjusted gas consumption and gas supply are balanced, the inverter will operate stably at this point, thus realizing the constant pressure operation of the system and ensuring that the system always operates in the most economical state.

[0035] However, the magnetic levitation blower 1 and the magnetic levitation vacuum pump 7 need to consider the oxygen purity at the same time. When the purity does not reach the set value, the frequency of the magnetic levitation blower 1 and the magnetic levitation vacuum pump 7 will not be reduced to ensure the oxygen purity.

[0036] The first adsorption tower 23 and the second adsorption tower 24 are operated alternately;

[0037] Specifically, the working principle and use process of the present invention are as follows: the pressure swing adsorption VPSA oxygen generator generally produces oxygen through the following operating steps; in one cycle, each adsorption tower must at least go through the five steps of "adsorption", "average pressure drop", "desorption", "flushing" and "average pressure increase". The first adsorption tower 23 and the second adsorption tower 24 are referred to as tower A and tower B for convenience of description. Figure 3 The figure shows the relationship between nitrogen adsorption and pressure change in an adsorption tower in one cycle. Figure 3 , the key operating steps of the two-tower VPSA oxygen production are described:

[0038]

[0039] Step 1: Adsorption AB

[0040] The raw air after the mechanical impurities are removed by the filter enters the tower from the bottom of the adsorption tower through the Roots blower, where H20, CO2, and N2 in the air are successively adsorbed by the adsorbents in the tower. Since O2 is rarely adsorbed in the adsorbent, it is continuously enriched in the gas phase and finally discharged from the outlet of the adsorption tower. In the "adsorption" step, the air is pressurized to P4 before it starts. During this process, the pressure in Tower A remains unchanged at P4, but the nitrogen adsorption amount changes from Q1 to Q3. After the adsorption amount reaches Q3, the air intake of Tower A is stopped and this step ends. Part of the oxygen produced in this step is sent to the buffer tank for oxygen transportation or use, and the other part is reserved for the next step to pressurize the low-pressure Tower B.

[0041] Step 2: Balance the voltage drop CD

[0042] In the "equal pressure drop" step, the product oxygen flows into Tower B along the outlet of Tower A, and the pressure of Tower B is increased. At this time, the adsorption pressure of Tower A continues to decrease, and the impurities on the adsorbent are continuously desorbed, and then the desorbed impurities are further adsorbed by the "clean" adsorbent reserved in the previous step. Therefore, in general, the impurities never flow out of Tower A in this step, and the impurity adsorption amount Q3 remains unchanged. As time goes by, when the adsorption pressure of Tower A drops to P3, the "clean" adsorbent in Tower A is also basically completely occupied by impurities, and the "equal pressure drop" step ends.

[0043] Step 3: Vacuum desorption of DA

[0044] After the "equal pressure drop" step, although the pressure in Tower A is close to atmospheric pressure, there are still some impurities in the adsorbent. In order to desorb these impurities as much as possible, Tower A must be evacuated and depressurized. Compared with PSA, VPSA is also this step, that is, further pumping Tower A through the vacuum pump to reduce the partial pressure of impurities in the tower, so that they are desorbed and discharged from Tower A through the vacuum pump. At the end of this step, the pressure in Tower A is reduced to P1, and the amount of impurities absorbed in the adsorbent is also reduced to the minimum amount Q1. At this time, the adsorbent is regenerated and ready for adsorption again in the next cycle.

[0045] Step 4: Flush EA

[0046] When the adsorption tower is performing the "vacuum desorption" step, in order to make the impurities in Tower A desorbed more thoroughly, a small amount of product oxygen will be introduced from Tower B to clean the adsorbent in Tower A at the end of the "vacuum desorption" stage. At this time, the oxygen partial pressure in Tower A is relatively increased, while the impurity partial pressure is relatively decreased, so that the impurities are more thoroughly desorbed in the adsorbent, thereby improving the regeneration effect of the adsorbent and being more conducive to the adsorption of the next cycle.

[0047] Step 5: Equalize the pressure to AB

[0048] After "vacuum desorption" and "flushing", the adsorbent in Tower A is regenerated. In order to ensure that the adsorption amount Q1 of impurities in the adsorbent remains unchanged, and the adsorption pressure is increased from P1 to the pressure P4 required for the adsorption condition as much as possible, a high-pressure product oxygen will be introduced to increase the pressure of Tower A. At the end of the "equal pressure increase", the pressure of Tower A reaches the pressure required for the adsorption condition, and is ready for the next cycle of impurity adsorption.

[0049] The switching of the above steps is mainly completed by the control system and the pneumatic switch valve group. The control system switches the pneumatic switch valve groups according to the sequential logic of each step, referred to as "timing logic", and then controls the time length of the adsorption tower in the steps of "adsorption", "equal pressure drop", "desorption", "flushing", "equal pressure increase", etc., so as to achieve oxygen and nitrogen separation and finally produce product oxygen that meets customer requirements.

[0050] The size of the corresponding flushing flow directly affects the performance of the equipment. When the flow is small, the flushing is incomplete and the purity does not meet the requirements. When the flow is large, it causes waste of product gas. The pneumatic control valve group is used to accurately adjust the regeneration gas volume.

[0051] When the equipment is in pressure equalization, the gas exhausted by the magnetic levitation blower 1 is discharged into the atmosphere, resulting in a waste of compressed air. When the equipment is in pressure equalization, the exhausted gas is released into the recovery storage tank 16. When the adsorption tower is pressurized, the gas is passed into the adsorption tower, which can quickly increase the pressure of the adsorption tower, save the consumption of compressed air, and further save energy.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A magnetic suspension vacuum pressure swing adsorption oxygen production equipment, characterized in that: include: A magnetic suspension blower (1), a heat exchanger (4), a magnetic suspension vacuum pump (7), a recovery storage tank (16), a second adsorption tower (24), a second adsorption tower (24), an oxygen buffer tank (35), an oxygen booster (37), and a switching mechanism and an instrument mechanism; The switching mechanism includes a pneumatic switch valve group, a manual switch valve group and a pneumatic regulating valve group; The instrument mechanism includes a pressure sensor group, a temperature sensor group, an oxygen purity analyzer (36) and an oxygen flow meter (38); The magnetic suspension blower (1) is directly connected to the heat exchanger (4), and a first pressure sensor (2) and a first temperature sensor (3) are provided on the connecting pipeline between the magnetic suspension blower (1) and the heat exchanger (4), and a second temperature sensor (6) is provided on the output pipeline of the heat exchanger (4), and the end of the output pipeline of the heat exchanger (4) is respectively connected to the first adsorption tower (23), the second adsorption tower (24) and the magnetic suspension vacuum pump (7), and a first pneumatic switch valve (10) is provided on the output pipeline. ), a second pneumatic switch valve (11), a third pneumatic switch valve (12), a fourth pneumatic switch valve (13), a first manual switch valve (14), a second manual switch valve (15), a fifth pneumatic switch valve (17), a sixth pneumatic switch valve (18), a seventh pneumatic switch valve (19), an eighth pneumatic switch valve (20), a third manual switch valve (21) and a fourth manual switch valve (22), wherein the recovery storage tank (16) is connected to the recovery pipelines of the first adsorption tower (23) and the second adsorption tower (24), The ends of the discharge pipelines of the first adsorption tower (23) and the second adsorption tower (24) are connected to the oxygen buffer tank (35), and the discharge pipelines are provided with symmetrically arranged third pressure sensors (25) and fourth pressure sensors (27), second temperature sensors (26) and third temperature sensors (28), ninth pneumatic switch valves (29) and first pneumatic regulating valves (30), as well as tenth pneumatic switch valves (31) and eleventh pneumatic switch valves (32), and the rear section of the discharge pipelines is provided with twelfth pneumatic switch valves ( 33) and a second pneumatic regulating valve (34), the other side of the oxygen buffer tank (35) is in communication with an oxygen booster (37), and the rear end of the oxygen booster (37) is connected to an oxygen flow meter (38), the output port of the oxygen flow meter (38) is connected to a user pipeline and an unqualified pipeline, the user pipeline is provided with a fifth pressure sensor (41), a fourth pneumatic regulating valve (42) and a one-way valve (43), and the unqualified pipeline is provided with a third pneumatic regulating valve (39) and a fifth manual switch valve (40); The pneumatic switch valve group comprises a first pneumatic switch valve (10), a second pneumatic switch valve (11), a third pneumatic switch valve (12), a fourth pneumatic switch valve (13), a fifth pneumatic switch valve (17), a sixth pneumatic switch valve (18), a seventh pneumatic switch valve (19), an eighth pneumatic switch valve (20), a ninth pneumatic switch valve (29), a tenth pneumatic switch valve (31), an eleventh pneumatic switch valve (32) and a twelfth pneumatic switch valve (33), and the opening and closing of the pipeline are controlled by the cylinder; The manual switch valve group comprises a first manual switch valve (14), a second manual switch valve (15), a third manual switch valve (21), a fourth manual switch valve (22) and a fifth manual switch valve (40), and is used to manually control the opening and closing of the pipeline; The pneumatic regulating valve group comprises a first pneumatic regulating valve (30), a second pneumatic regulating valve (34) and a third pneumatic regulating valve (39), which are used to control the flow rate of the pipeline; The pressure sensor group comprises a first pressure sensor (2), a second pressure sensor (9), a third pressure sensor (25), a fourth pressure sensor (27) and a fifth pressure sensor (41), which are used to monitor the pressure of the pipeline, and the pressure sensor group is installed at the air outlet of each structure; The temperature sensor group comprises a first temperature sensor (3), a second temperature sensor (26) and a third temperature sensor (28), which are used to monitor the temperature of the pipeline.

2. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The other end of the magnetic levitation vacuum pump (7) is connected to an exhaust muffler (8), and a second pressure sensor (9) is provided on the output pipeline between the magnetic levitation vacuum pump (7) and the heat exchanger (4).

3. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The magnetic suspension blower (1) is a variable torque load, and its pressure, shaft power and flow rate satisfy the following relationship: The flow rate and the speed are in direct proportion, the pressure and the square of the speed are in direct proportion, and the shaft power and the cube of the speed are in direct proportion. Therefore, if the speed of the motor decreases, its shaft power will decrease significantly. For example, when the flow is 75% of the loading flow, the shaft power will drop to 49% of the rated power.

4. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The pressure sensor group is installed at the air outlet to obtain the required current signal. The specific relationship is as follows: If the gas consumption decreases, the pressure increases, and if the gas consumption increases, the pressure decreases.

5. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The first adsorption tower (23) and the second adsorption tower (24) are operated alternately.

6. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: Only one of the tenth pneumatic switch valve (31) and the eleventh pneumatic switch valve (32) is opened at the same time, and when the tenth pneumatic switch valve (31) and the eleventh pneumatic switch valve (32) are both closed, the ninth pneumatic switch valve (29) and the first pneumatic regulating valve (30) are opened.

7. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The heat exchanger (4) is connected to a water leakage alarm (5).

8. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: A third manual switch valve (21) and a fourth manual switch valve (22) are respectively provided on the air inlets of the first adsorption tower (23) and the second adsorption tower (24).

9. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The output pipeline of the heat exchanger (4) is provided with a branch pipeline of a seventh pneumatic switch valve (19) and an eighth pneumatic switch valve (20) for connecting the first adsorption tower (23) and the second adsorption tower (24), and the branch pipeline is connected to the recovery storage tank (16).

10. The magnetic suspension vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The one-way valve (43) is connected in series with the fifth pressure sensor (41) and the fourth pneumatic regulating valve (42) on the user pipeline, and the one-way valve (43) controls the gas to move only toward the user pipeline outlet.

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