VPSA technology oxygen generator

Abstract

The utility model discloses a VPSA technology oxygenerator, including main air inlet, compressor, solenoid valve, molecular sieve bucket no. 1, molecular sieve bucket no. 2, communication valve and air reservoir, through setting up two molecular sieve bucket, when air flows into one of molecular sieve bucket through the communication pipe, the nitrogen that passes through the molecular sieve bucket is adsorbed, oxygen flows into the air reservoir, and the oxygen is absorbed by the molecular sieve bucket. Meanwhile, nitrogen in the other molecular sieve barrel is pumped out through a negative pressure air inlet of the compressor to be vacuumized, the two molecular sieve barrels are communicated by opening the communicating valve, a small part of oxygen in the other molecular sieve barrel can be pumped into the molecular sieve barrel with air to further blow out the nitrogen, the communicating valve is closed again, the nitrogen is exhausted thoroughly, and almost no nitrogen is left; the utilization rate of the molecular sieve is improved, the required filling amount of the molecular sieve is obviously reduced, the single flow in the device is small, the pressure in the system is small, the service life of the molecular sieve can be effectively prolonged, the power demand of the compressor is small, and the noise of the product is low.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen production, in particular to a VPSA technology oxygen generator. Background Art

[0002] The main methods for producing oxygen are: cryogenic oxygen production, VPSA (PSA, VPSA, VSA) oxygen production, membrane separation oxygen production, water electrolysis oxygen production and chemical oxygen production. VPSA oxygen production uses VPSA special molecular sieves to selectively adsorb impurities such as nitrogen, carbon dioxide and water in the air, and desorbs the molecular sieves under vacuum conditions to circulate and produce high-purity oxygen. Usually, air is extracted by a vacuum pump as a raw material, and the air is formed into the required gas after adsorption, filtration and separation. With the development of industry, the demand for oxygen is increasing. As a way to produce oxygen, VPSA oxygen production equipment is gradually developing towards large-scale, the pressure of the gas in the system is gradually increasing, the power requirements for the compressor are increasing, and the noise generated during system operation is gradually increasing. Utility Model Content

[0003] The purpose of the utility model is to provide a VPSA technology oxygen generator to solve the technical problems in the prior art that oxygen production equipment is gradually developing towards large-scale, the pressure of the gas in the system is gradually increasing, the power requirement for the compressor is getting higher and higher, and the noise generated during the operation of the system is gradually increasing.

[0004] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0005] A VPSA technology oxygen concentrator comprises: a main air inlet, a compressor, a solenoid valve, a molecular sieve 1, a molecular sieve 2, a connecting valve and an air storage cylinder. The compressor comprises a positive pressure air inlet, a positive pressure air outlet, a negative pressure air inlet and a negative pressure air outlet. The positive pressure air inlet is connected to the positive pressure air outlet, the negative pressure air inlet is connected to the negative pressure air outlet, the main air inlet is connected to the positive pressure air inlet, the positive pressure air outlet and the negative pressure air inlet are respectively connected to the solenoid valve, the molecular sieve 1 and the molecular sieve 2 are respectively connected to the solenoid valve, the connecting valve is respectively connected to the molecular sieve 1 and the molecular sieve 2, the air storage cylinder is respectively connected to the molecular sieve 1 and the molecular sieve 2, and the air storage cylinder is connected to the oxygen outlet.

[0006] As a further solution of the utility model: a flow regulating valve and a sensor are arranged between the gas storage cylinder and the oxygen outlet, the flow regulating valve and the sensor are connected, a bacterial filter is arranged on the connecting pipeline between the gas storage cylinder and the flow regulating valve, and a one-way valve is arranged on the connecting pipeline between the sensor and the oxygen outlet.

[0007] As a further solution of the utility model: a splitter three is provided at the air inlet end of the air storage cylinder, the splitter three includes two inlets and one outlet, and the outlet of the splitter three is connected to the air inlet end of the air storage cylinder.

[0008] As a further solution of the utility model: a diverter 1 is provided at the output end of the molecular sieve 1, and the diverter 1 includes an inlet and two outlets. The inlet of the diverter 1 is connected to the output end of the molecular sieve 1, an outlet of the diverter 1 is connected to the connecting valve, and the other outlet of the diverter 1 is connected to an inlet of the diverter 3.

[0009] As a further solution of the utility model: a diverter 2 is provided at the output end of molecular sieve 2, and diverter 2 includes an inlet and two outlets. The inlet of molecular sieve 2 is connected to the output end of molecular sieve 2, an outlet of diverter 2 is connected to the connecting valve, and the other outlet of diverter 2 is connected to another inlet of diverter 3.

[0010] As a further solution of the utility model: a condenser is arranged between the positive pressure air outlet of the compressor and the solenoid valve, one end of the condenser is connected to the positive pressure air outlet of the compressor, and the other end of the condenser is connected to the solenoid valve.

[0011] As a further solution of the utility model: an air intake muffler is arranged on the connecting pipeline between the main air inlet and the compressor, a nitrogen venting muffler is connected to the negative pressure air outlet of the compressor, and a nitrogen exhaust muffler is connected to the nitrogen venting muffler.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model pressurizes and inflates the molecular sieve barrel 1 and the molecular sieve barrel 2 respectively through the positive pressure air inlet and the positive pressure air outlet of the compressor at different time periods, and extracts nitrogen from the molecular sieve barrel 2 and the molecular sieve barrel 1 respectively through the negative pressure air inlet and the negative pressure air outlet of the compressor at different time periods, so that the single flow rate in the device is small, so the pressure in the system is small, which can effectively extend the service life of the molecular sieve, and at the same time, the power demand of the compressor is small, and the noise of the product is low;

[0014] 2. The utility model sets two molecular sieve barrels. When air flows into one of the molecular sieve barrels through a connecting pipe, the nitrogen passing through the molecular sieve of the molecular sieve barrel is adsorbed, and oxygen flows into the air storage cylinder. At the same time, the negative pressure air inlet of the compressor draws out the nitrogen in the other molecular sieve barrel to form a vacuum. The connecting valve is opened to connect the two molecular sieve barrels, and a small part of the oxygen in the other molecular sieve barrel is drawn into the molecular sieve barrel that is ventilated with air to further blow out the nitrogen. Then the connecting valve is closed again, so that the nitrogen is discharged more thoroughly, and almost no nitrogen is retained. At the same time, the utilization rate of the molecular sieve is significantly improved, and the required molecular sieve filling amount is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is the gas circuit diagram of the overall structure of the utility model.

[0017] In the figure: 1. Main air inlet; 2. Air inlet silencer; 3. Compressor; 31. Positive pressure air inlet; 32. Positive pressure air outlet; 33. Negative pressure air inlet; 34. Negative pressure air outlet; 4. Nitrogen vent silencer; 5. Condenser; 6. Solenoid valve; 7. Molecular sieve barrel one; 71. Diverter one; 8. Molecular sieve barrel two; 81. Diverter two; 9. Connecting valve; 10. Air storage cylinder; 11. Diverter three; 12. Bacteria filter; 13. Electronic flow control valve; 14. Sensor; 15. Check valve; 16. Oxygen outlet; 17. Nitrogen exhaust silencer. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, a VPSA technology oxygen concentrator includes: a total air inlet 1, a compressor 3, a solenoid valve 6, a molecular sieve barrel 1 7, a molecular sieve barrel 2 8, a connecting valve 9 and an air storage cylinder 10. The compressor 3 includes a positive pressure air inlet 31, a positive pressure air outlet 32, a negative pressure air inlet 33 and a negative pressure air outlet 34. The positive pressure air inlet 31 is connected to the positive pressure air outlet 32, and the negative pressure air inlet 33 is connected to the negative pressure air outlet 34. The total air inlet 1 is connected to the positive pressure air inlet 31, the positive pressure air outlet 32 ​​and the negative pressure air inlet 33 are respectively connected to the solenoid valve 6, the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8 are respectively connected to the solenoid valve 6, the connecting valve 9 is respectively connected to the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, the air storage cylinder 10 is respectively connected to the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, and the air storage cylinder 10 is connected to the oxygen outlet 16.

[0020] Solenoid valve 6, solenoid valve is an industrial equipment controlled by electromagnetic, is an automated basic component for controlling fluid, belongs to an actuator, and is not limited to hydraulic and pneumatic. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. In this device, a pilot pipe connecting the air inlet and the air outlet of the solenoid valve is arranged outside the solenoid valve housing. The solenoid valve switches from the air outlet through the pilot pipe to the air inlet, so that the diaphragm valve can be switched. The pilot pipe line of the solenoid valve used in ordinary oxygen generators is an internal structure. The solenoid valve needs to extract and discharge nitrogen, and the internal space is difficult to complete. It is made externally and connected with a pipeline. Compared with the solenoid valve used in ordinary oxygen generators, the solenoid valve in this device is not prone to failure, and the air outlet and air inlet apertures are much larger than those of ordinary built-in ones, and are not easily blocked by foreign matter. At the same time, it is easy to process and save costs.

[0021] A flow regulating valve 13 and a sensor 14 are provided between the gas cylinder 10 and the oxygen outlet 16 . The flow regulating valve 13 and the sensor 14 are connected. A bacteria filter 12 is provided on the connecting pipeline between the gas cylinder 10 and the flow regulating valve 13 for filtering bacteria in oxygen to ensure the purity of oxygen. A one-way valve 15 is provided on the connecting pipeline between the sensor 14 and the oxygen outlet 16 .

[0022] The sensor 14 is specifically a zirconium oxide oxygen sensor, which is a similar electrochemical oxygen sensor.

[0023] The flow regulating valve 13 is specifically a self-operated flow regulating valve, which is composed of a control valve with a set flow and an actuator, and can be automatically adjusted according to the set value. It is mainly used in situations where the controlled flow is not frequently changed (adjusted) once it is set. It integrates detection, control, and execution functions in one valve, forming an independent instrument control system.

[0024] One-way valve 15, also known as non-return valve or check valve. It is used in hydraulic systems to prevent oil flow from flowing in reverse, or in pneumatic systems to prevent compressed air from flowing in reverse.

[0025] The air inlet end of the air storage cylinder 10 is provided with a diverter three 11, which includes two inlets and one outlet, and the outlet of the diverter three 11 is connected to the air inlet end of the air storage cylinder 10. The output end of the molecular sieve barrel 7 is provided with a diverter 71, which includes an inlet and two outlets, and the inlet of the diverter 71 is connected to the output end of the molecular sieve barrel 7, an outlet of the diverter 71 is connected to the connecting valve 9, and the other outlet of the diverter 71 is connected to an inlet of the diverter three 11. The output end of the molecular sieve barrel 8 is provided with a diverter two 81, which includes an inlet and two outlets, and the inlet of the molecular sieve barrel 8 is connected to the output end of the molecular sieve barrel 8, an outlet of the diverter two 81 is connected to the connecting valve 9, and the other outlet of the diverter two 81 is connected to another inlet of the diverter three 11. The connecting valve 9 is used to control the connection and disconnection between the molecular sieve barrel 7 and the molecular sieve barrel 8.

[0026] A condenser 5 is provided between the positive pressure air outlet 32 ​​of the compressor 3 and the solenoid valve 6. One end of the condenser 5 is connected to the positive pressure air outlet 32 ​​of the compressor 3, and the other end of the condenser 5 is connected to the solenoid valve 6. The condenser 5 is used to cool the compressed gas and remove water vapor in the air.

[0027] An air intake silencer 2 is provided on the connecting pipeline between the main air intake port 1 and the compressor 3, a nitrogen vent silencer 4 is connected to the negative pressure air outlet 34 of the compressor 3, and a nitrogen exhaust silencer 17 is connected to the nitrogen vent silencer 4, so as to reduce the overall noise during the operation of the system.

[0028] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0029] A VPSA technology oxygen concentrator has the following steps when in operation:

[0030] Step 1: air enters the device from the main air inlet 1, passes through the air inlet silencer 2 and the positive pressure air inlet 31 of the compressor 3, the positive pressure air outlet 32 ​​of the compressor 3 and the condenser 5, and then reaches the solenoid valve 6. After the solenoid valve 6 is switched, the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8 are pressurized and inflated through the positive pressure air inlet 31 and the positive pressure air outlet 32 ​​of the compressor 3 at different time periods. At the same time, nitrogen is extracted from the molecular sieve barrel 2 8 and the molecular sieve barrel 1 7 through the negative pressure air inlet 33 and the negative pressure air outlet 34 of the compressor 3 at different time periods. That is, when the positive pressure air outlet 32 ​​of the compressor 3 fills air into the molecular sieve barrel 1 7, the negative pressure air inlet 33 of the compressor 3 extracts gas from the molecular sieve barrel 2 8, and the cycle continues after the switching of the solenoid valve 6.

[0031] Step 2: After the air enters the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, the nitrogen and oxygen in the air are separated by adsorption in the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8. The nitrogen will be adsorbed on the molecular sieves of the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, and the oxygen will enter the gas storage cylinder through the connecting pipe, and then flow to the oxygen outlet 16 through the connecting pipe.

[0032] Step 3: The connecting valve 9 is in a normally closed state. When the negative pressure air inlet 33 of the compressor 3 extracts part of the nitrogen from the molecular sieve barrel 1 7 or the molecular sieve barrel 2 8, the connecting valve 9 is opened in the gap of the switching of the solenoid valve 6. The single opening time of the connecting valve 9 is 0.68 seconds, and the molecular sieve barrel 1 7 is connected with the molecular sieve barrel 2 8, and the oxygen in the molecular sieve barrel 1 7 or the molecular sieve barrel 2 8 is further extracted. Specifically, the air flows to the solenoid valve 6, and flows into the molecular sieve barrel 1 7 through the connecting pipe. The nitrogen is adsorbed when passing through the molecular sieve barrel 1 7, and the oxygen flows into the air storage cylinder 10. At the same time, the negative pressure air inlet 33 of the compressor 3 extracts the nitrogen in the molecular sieve barrel 2 8, and the air flows into the molecular sieve barrel 1 7. To form a vacuum negative pressure, the connecting valve 9 is opened to connect the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, and a small part of the oxygen in the molecular sieve barrel 1 7 will be drawn into the molecular sieve barrel 2 8 to further blow out the nitrogen, and then the connecting valve is closed again; when the air flows into the molecular sieve barrel 2 8 through the connecting pipe, the nitrogen passing through the molecular sieve of the molecular sieve barrel 2 8 is adsorbed, and the oxygen flows into the air storage cylinder 10, and at the same time, the negative pressure air inlet 33 of the compressor 3 draws out the nitrogen in the molecular sieve barrel 7 to form a vacuum, and the connecting valve 9 is opened to connect the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8, and a small part of the oxygen in the molecular sieve barrel 2 8 will be drawn into the molecular sieve barrel 7 to further blow out the nitrogen, and then the connecting valve 9 is closed again.

[0033] By setting two molecular sieve barrels, when air flows into one of the molecular sieve barrels through the connecting pipe, the nitrogen passing through the molecular sieve of the molecular sieve barrel is adsorbed, and the oxygen flows into the air storage cylinder 10. At the same time, the negative pressure air inlet 33 of the compressor 3 draws out the nitrogen in the other molecular sieve barrel to form a vacuum. The connecting valve 9 is opened to connect the two molecular sieve barrels, and a small part of the oxygen in the other molecular sieve barrel is drawn into the molecular sieve barrel that is ventilated with air to further blow out the nitrogen. Then the connecting valve is closed again, so that the nitrogen is discharged more thoroughly, and almost no nitrogen is retained. At the same time, the utilization rate of the molecular sieve is significantly improved, and the required molecular sieve filling amount is significantly reduced;

[0034] In different time periods, the molecular sieve barrel 1 7 and the molecular sieve barrel 2 8 are pressurized and inflated respectively through the positive pressure air inlet 31 and the positive pressure air outlet 32 ​​of the compressor 3. At the same time, nitrogen is extracted from the molecular sieve barrel 2 8 and the molecular sieve barrel 1 7 respectively through the negative pressure air inlet 33 and the negative pressure air outlet 34 of the compressor 3 in different time periods, so that the single flow rate flowing through the device is small, so the pressure in the system is small, which can effectively extend the service life of the molecular sieve. At the same time, the power demand of the compressor is small and the noise of the product is low.

[0035] Several embodiments of the utility model are described in detail above, but the embodiments of the utility model are not limited thereto and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A VPSA technology oxygen concentrator, characterized in that: include: A total air inlet (1), a compressor (3), an electromagnetic valve (6), a molecular sieve 1 (7), a molecular sieve 2 (8), a connecting valve (9) and an air storage cylinder (10); the compressor (3) comprises a positive pressure air inlet (31), a positive pressure air outlet (32), a negative pressure air inlet (33) and a negative pressure air outlet (34); the positive pressure air inlet (31) is connected to the positive pressure air outlet (32), the negative pressure air inlet (33) is connected to the negative pressure air outlet (34); the total air inlet ( 1) is connected to the positive pressure air inlet (31), the positive pressure air outlet (32) and the negative pressure air inlet (33) are respectively connected to the electromagnetic valve (6), the molecular sieve 1 (7) and the molecular sieve 2 (8) are respectively connected to the electromagnetic valve (6), the connecting valve (9) is respectively connected to the molecular sieve 1 (7) and the molecular sieve 2 (8), the air storage cylinder (10) is respectively connected to the molecular sieve 1 (7) and the molecular sieve 2 (8), and the air storage cylinder (10) is connected to an oxygen outlet (16).

2. A VPSA technology oxygen concentrator according to claim 1, characterized in that: A flow regulating valve (13) and a sensor (14) are provided between the gas storage cylinder (10) and the oxygen outlet (16); the flow regulating valve (13) and the sensor (14) are connected to each other; a bacteria filter (12) is provided on the connecting pipeline between the gas storage cylinder (10) and the flow regulating valve (13); and a one-way valve (15) is provided on the connecting pipeline between the sensor (14) and the oxygen outlet (16).

3. A VPSA technology oxygen concentrator according to claim 1, characterized in that: The air inlet end of the air storage cylinder (10) is provided with a flow divider three (11), the flow divider three (11) comprises two inlets and one outlet, and the outlet of the flow divider three (11) is connected to the air inlet end of the air storage cylinder (10).

4. A VPSA technology oxygen concentrator according to claim 3, characterized in that: A splitter 1 (71) is provided at the output end of the molecular sieve 1 (7). The splitter 1 (71) includes an inlet and two outlets. The inlet of the splitter 1 (71) is connected to the output end of the molecular sieve 1 (7), an outlet of the splitter 1 (71) is connected to the connecting valve (9), and the other outlet of the splitter 1 (71) is connected to an inlet of the splitter 3 (11).

5. A VPSA technology oxygen concentrator according to claim 3, characterized in that: The output end of the molecular sieve 2 (8) is provided with a splitter 2 (81), which includes an inlet and two outlets. The inlet of the molecular sieve 2 (8) is connected to the output end of the molecular sieve 2 (8), one outlet of the splitter 2 (81) is connected to the connecting valve (9), and the other outlet of the splitter 2 (81) is connected to the other inlet of the splitter 3 (11).

6. A VPSA technology oxygen generator according to claim 1, characterized in that: A condenser (5) is provided between the positive pressure air outlet (32) of the compressor (3) and the electromagnetic valve (6); one end of the condenser (5) is connected to the positive pressure air outlet (32) of the compressor (3), and the other end of the condenser (5) is connected to the electromagnetic valve (6).

7. A VPSA technology oxygen concentrator according to claim 1, characterized in that: An air intake silencer (2) is arranged on the connecting pipeline between the main air intake port (1) and the compressor (3), a nitrogen exhaust silencer (4) is connected to the negative pressure air outlet port (34) of the compressor (3), and a nitrogen exhaust silencer (17) is connected to the nitrogen exhaust silencer (4).

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