Oxygen production equipment

Abstract

The utility model discloses oxygen production equipment which comprises an air compressor, an air storage tank and an oxygen production device which are communicated in sequence, the device further comprises an oxygen storage tank, an exhaust pipeline, a vacuum pump, a seventh valve and an eighth valve. The oxygen production device comprises a valve group, a first adsorption tower and a second adsorption tower; valves in the valve group comprise a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve; a fifth branch air channel and a sixth branch air channel are arranged at one end of the exhaust pipeline, an eighth valve is arranged on the fifth branch air channel, the vacuum pump is arranged on the sixth branch air channel, and a seventh valve is arranged between the vacuum pump and the exhaust pipeline. According to the utility model, the molecular sieve can be desorbed more thoroughly, so that the oxygen production efficiency is improved; when the oxygen production equipment is shut down, the molecular sieve in the adsorption tower can be stored in a negative pressure state, so that the service life of the molecular sieve is prevented from being influenced by moisture, and the service life of the oxygen production equipment is further prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen production equipment, and specifically relates to oxygen production equipment. Background Art

[0002] Large-scale PSA medical molecular sieve oxygen generator is the main oxygen generator in modern hospitals and high-altitude areas. Its oxygen production principle is simple, using air as raw material, and has the advantages of low operating cost, low energy consumption, and high efficiency. The concentration of oxygen produced is 90% to 96%. PSA oxygen generator is characterized by fast oxygen production, safe, economical and convenient oxygen production process, and can better serve as the oxygen source of the oxygen supply system.

[0003] The PSA oxygen production equipment uses zeolite molecular sieve (hereinafter referred to as molecular sieve) as an adsorbent to pressurize and desorb compressed air. The principle is that nitrogen in the compressed air is preferentially adsorbed by the zeolite molecular sieve, and oxygen is enriched to form finished oxygen. Then, by reducing the pressure of the adsorption tower to normal pressure, the adsorbent desorbs nitrogen and impurities to achieve regeneration. Because the molecular sieve replacement process has strict requirements and is difficult to operate, the service life of the PSA oxygen production equipment in the prior art is mainly determined by the life of the molecular sieve inside the adsorption tower. The molecular sieve is often used during use. The service life of the PSA oxygen production equipment is greatly reduced due to improper operation or storage.

[0004] If compressed air carrying moisture and oil directly enters the oxygen production equipment, it will cause molecular sieve poisoning, reduce gas production rate and shorten the service life of molecular sieve.

[0005] For example, in actual production, oxygen production equipment often needs to be shut down for a long time due to some emergencies or uncontrollable factors. If PSA oxygen production equipment is idle for a long time, some problems will arise. When the oxygen production equipment is shut down, the inside of its two adsorption towers is under pressure, with a large amount of air and high pressure. The molecular sieve has been coexisting with the pressurized air for a long time when it is shut down, and it is possible to absorb the moisture inside, causing the molecular sieve to become damp and powdery, which has a very bad effect on its preservation, thus shortening the service life of the molecular sieve. And once the molecular sieve is damp, the oxygen purity of the oxygen production equipment will also decrease. Utility Model Content

[0006] The utility model aims at the above problems, makes up for the deficiencies of the prior art, and provides an oxygen production equipment, the oxygen production equipment comprising an air compressor, an air storage tank, and an oxygen production device connected in sequence; the oxygen production equipment also comprises an oxygen storage tank, an exhaust pipeline, a vacuum pump, a seventh valve, and an eighth valve;

[0007] The oxygen production device comprises a valve group, a first adsorption tower, and a second adsorption tower;

[0008] The valves in the valve group include a first valve, a second valve, a third valve, a fourth valve, a fifth valve, and a sixth valve;

[0009] A first airway is provided at the top of the first adsorption tower, a second valve is provided on the first airway, and the first airway is connected to the oxygen storage tank; a second airway is provided at the bottom of the first adsorption tower, a first branch airway and a second branch airway are provided at one end of the second airway, a sixth valve is provided on the first branch airway, and a fourth valve is provided on the second branch airway; the first branch airway is connected to the air storage tank, and the second branch airway is connected to the exhaust pipeline;

[0010] A third airway is provided at the top of the second adsorption tower, a first valve is provided on the third airway, and the third airway is connected to the oxygen storage tank; a fourth airway is provided at the bottom of the second adsorption tower, a third branch airway and a fourth branch airway are provided at one end of the fourth airway, a third valve is provided on the third branch airway, and a fifth valve is provided on the fourth branch airway; the fourth branch airway is connected to the air storage tank, and the third branch airway is connected to the exhaust pipeline;

[0011] A fifth branch airway and a sixth branch airway are arranged at one end of the exhaust pipeline, an eighth valve is arranged on the fifth branch airway, the vacuum pump is arranged on the sixth branch airway, and a seventh valve is arranged between the vacuum pump and the exhaust pipeline.

[0012] Preferably, an exhaust muffler is provided at one end of the fifth branch air passage.

[0013] Preferably, a vacuum muffler is provided at one end of the sixth branch airway.

[0014] Preferably, the valve in the valve group, the seventh valve and the eighth valve are all provided with pilot control valves, and the valve in the valve group, the seventh valve and the eighth valve are all pneumatic valves.

[0015] Preferably, the oxygen production equipment is further provided with a control gas circuit, and the control gas circuit is connected to the air storage tank and the pilot control valve.

[0016] Preferably, the air storage tank and the oxygen storage tank are both provided with a safety valve and a drain valve.

[0017] Preferably, the air storage tank, the first adsorption tower, the second adsorption tower and the oxygen storage tank are all provided with pressure sensors and pressure gauges.

[0018] Beneficial effects of the utility model:

[0019] 1. Since a vacuum pump is added to the exhaust pipeline, the oxygen production equipment can evacuate the adsorption tower after normal exhaust, so that the desorption adsorption tower reaches a negative pressure state, thereby making the molecular sieve desorb more thoroughly, and more nitrogen can be adsorbed in the next adsorption cycle, producing more oxygen and improving the oxygen production efficiency.

[0020] 2. When the oxygen production equipment is shut down after operation, at least one of the two adsorption towers is in a high pressure state. At this time, the two adsorption towers are evacuated in turn through a vacuum pump, so that the molecular sieve in the adsorption tower can be kept under negative pressure to prevent moisture from affecting the service life of the molecular sieve, thereby improving the service life of the oxygen production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an oxygen production equipment of the utility model.

[0022] Markings in the figure: 1 is an air compressor; 2 is an air storage tank; 3 is a first adsorption tower; 4 is a second adsorption tower; 5 is an oxygen storage tank; 6 is an exhaust silencer; 7 is a vacuum pump; 8 is a vacuum silencer; 9 is a pressure sensor; 10 is a pressure gauge; 11 is a pilot control valve; 12 is a first valve; 13 is a second valve; 14 is a third valve; 15 is a fourth valve; 16 is a fifth valve; 17 is a sixth valve; 18 is a seventh valve; 19 is an eighth valve; 20 is a control air circuit; 21 is an air intake pipeline; 22 is a one-way valve; 23 is a first airway; 24 is a third airway; 25 is a first branch airway; 26 is a second branch airway; 27 is a sixth branch airway; 28 is a fifth branch airway. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0024] Combination Figure 1 As shown, an oxygen production equipment includes an air compressor 1, an air storage tank 2, and an oxygen production device connected in sequence; it also includes an oxygen storage tank 5, an exhaust pipeline, a vacuum pump 7, a seventh valve 18, and an eighth valve 19;

[0025] The oxygen production device includes a valve group, a first adsorption tower 3, and a second adsorption tower 4;

[0026] The valves in the valve group include a first valve 12, a second valve 13, a third valve 14, a fourth valve 15, a fifth valve 16, and a sixth valve 17;

[0027] A first airway 23 is provided at the top of the first adsorption tower 3, a second valve 13 is provided on the first airway 23, and the first airway 23 is connected to the oxygen storage tank 5 through the oxygen supply pipeline; a second airway is provided at the bottom of the first adsorption tower 3, a first branch airway 25 and a second branch airway 26 are provided at one end of the second airway, a sixth valve 17 is provided on the first branch airway 25, and a fourth valve 15 is provided on the second branch airway 26; the first branch airway 25 is connected to the air storage tank 2 through the air intake pipeline 21, and the second branch airway 26 is connected to the exhaust pipeline;

[0028] from Figure 1 It can also be seen that the second airway is connected to the first branch airway 25, and the second airway is connected to the second branch airway 26.

[0029] A third airway 24 is provided at the top of the second adsorption tower 4, a first valve 12 is provided on the third airway 24, the third airway 24 is connected to the oxygen storage tank 5 through an oxygen delivery pipeline, and a one-way valve 22 is provided on the oxygen delivery pipeline; a fourth airway is provided at the bottom of the second adsorption tower 4, a third branch airway and a fourth branch airway are provided at one end of the fourth airway, the fourth airway is connected to the third branch airway, the fourth airway is connected to the fourth branch airway, a third valve 14 is provided on the third branch airway, and a fifth valve 16 is provided on the fourth branch airway; the fourth branch airway is connected to the air storage tank 2, and the third branch airway is connected to the exhaust pipeline;

[0030] A fifth branch airway 28 and a sixth branch airway 27 are arranged at one end of the exhaust pipeline, an eighth valve 19 is arranged on the fifth branch airway 28, a vacuum pump 7 is arranged on the sixth branch airway 27, and a seventh valve 18 is arranged between the vacuum pump 7 and the exhaust pipeline.

[0031] Specifically, an exhaust muffler 6 is disposed at one end of the fifth branch airway 28, and a vacuum muffler 8 is disposed at one end of the sixth branch airway 27. The exhaust muffler 6 and the vacuum muffler 8 can make the oxygen production equipment quieter when in use.

[0032] Specifically, the valves in the valve group, the seventh valve 18, and the eighth valve 19 are all provided with a pilot control valve 11, and the valves in the valve group, the seventh valve 18, and the eighth valve 19 are all pneumatic valves. The oxygen production equipment of the utility model is also provided with a control gas circuit 20, and the control gas circuit 20 is connected to the air storage tank 2 and the pilot control valve 11.

[0033] The oxygen production equipment of the utility model also includes a controller, which controls the switching of valves and the transmission of oxygen in the entire oxygen production process.

[0034] The pilot control valve 11 in the utility model controls the on-off of the valve in which it is located, and each pilot control valve 11 is connected to the air intake port on the air storage tank 2 through the control air circuit 20.

[0035] The control air path 20 is made of polyurethane material.

[0036] Specifically, the air storage tank 2 and the oxygen storage tank 5 are both provided with a safety valve and a drain valve.

[0037] Specifically, pressure sensors 9 and pressure gauges 10 are provided on the air storage tank 2, the first adsorption tower 3, the second adsorption tower 4, and the oxygen storage tank 5. The pressure gauge 10 can monitor the pressure changes in the adsorption tower in real time. If there are leaks or other abnormal pressure problems in the oxygen production equipment, the pressure sensor 9 can make signal feedback or alarm in time.

[0038] The working principle of this utility model:

[0039] The compressed air generated by the air compressor 1 enters the air storage tank 2, which acts as a buffer. Most of the high-pressure gas inside the air storage tank 2 is used for the production of oxygen, and a very small part is used as a control gas source for the pilot control valve 11. By controlling the working sequence of each valve, the alternating adsorption and desorption process of the two adsorption towers is controlled, thereby generating oxygen and storing it in the oxygen storage tank 5.

[0040] During the production process, one of the two adsorption towers is evacuated by the vacuum pump 7 in the second half of the desorption process to make the desorption process more thorough. When the oxygen production equipment is shut down as a whole, the vacuum pump 7 evacuates the two adsorption towers in turn by controlling the on-off of the valve again, and shuts down after the pressure data fed back by the pressure sensors 9 on the two adsorption towers reaches the set value, ensuring that both adsorption towers have a certain negative pressure value.

[0041] The working process of this utility model:

[0042] First, start the air compressor 1, and the high-pressure gas generated by the air compressor 1 enters the air storage tank 2. After the pressure in the air storage tank 2 reaches 0.5-0.6MPa, the pressure sensor 9 of the air storage tank 2 feeds back the signal to the controller, and the controller controls the sixth valve 17, the second valve 13, and the third valve 14 to open, and the first adsorption tower 3 starts to increase the pressure and adsorb to produce oxygen, which enters the oxygen storage tank 5 through the one-way valve 22, and the second adsorption tower 4 desorbs; open the eighth valve 19, and close the eighth valve 19 after the pressure sensor 9 on the second adsorption tower 4 detects that its internal pressure reaches the set range, open the seventh valve 18, and the vacuum pump 7 performs negative pressure extraction. After the first adsorption tower 3 completes adsorption and the second adsorption tower 4 completes desorption in this cycle, the sixth valve 17, the second valve 13, the third valve 14, and the seventh valve 18 are closed to carry out the next cycle.

[0043] The controller controls the fifth valve 16, the first valve 12, and the fourth valve 15 to open. At this time, the second adsorption tower 4 starts to increase the pressure to adsorb and produce oxygen, which enters the oxygen storage tank 5 through the one-way valve 22. The first adsorption tower 3 performs desorption, and the eighth valve 19 is opened first and then closed after the pressure sensor 9 of the first adsorption tower 3 detects that the internal pressure reaches the set range, and then the seventh valve 18 is opened, and the negative pressure is pumped through the vacuum pump 7. In this cycle, after the second adsorption tower 4 completes adsorption and the first adsorption tower 3 completes desorption, the fifth valve 16, the first valve 12, the fourth valve 15, and the seventh valve 18 are closed, and then the first cycle of work is repeated.

[0044] When the oxygen production equipment needs to be shut down, the controller first closes all valves, then opens the fourth valve 15 and the eighth valve 19, and after the pressure sensor 9 on the first adsorption tower 3 detects that its internal pressure reaches the set range, the eighth valve 19 is closed, the seventh valve 18 is opened, and the vacuum pump 7 performs negative pressure extraction. After the pressure sensor 9 detects that the required negative pressure value (-50KPa~-60KPa) is reached again, the fourth valve 15 and the seventh valve 18 are closed, and the negative pressure of the first adsorption tower 3 is completed.

[0045] Finally, open the third valve 14 and the eighth valve 19. After the pressure sensor on the second adsorption tower 4 detects that its internal pressure reaches the set range, close the eighth valve 19, open the seventh valve 18, and the vacuum pump 7 starts to pump negative pressure. After the pressure sensor 9 detects that the required negative pressure value is reached, close the third valve 14 and the seventh valve 18, and the negative pressure of the second adsorption tower 4 is completed.

[0046] Since a vacuum pump 7 is added to the exhaust pipeline, the oxygen production equipment can evacuate the adsorption tower after normal exhaust, so that the desorption adsorption tower reaches a negative pressure state, thereby making the molecular sieve desorb more thoroughly, and more nitrogen can be adsorbed in the next adsorption cycle, producing more oxygen, thereby improving the oxygen production efficiency.

[0047] When the oxygen production equipment is shut down after operation, at least one of the two adsorption towers is in a high pressure state. At this time, the two adsorption towers are evacuated in turn by the vacuum pump 7, so that the molecular sieves in the adsorption towers can be kept under negative pressure to prevent moisture from affecting the service life of the molecular sieves, thereby improving the service life of the oxygen production equipment.

[0048] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

Claims

1. An oxygen production equipment, characterized in that: The oxygen production equipment comprises an air compressor (1), an air storage tank (2), and an oxygen production device which are connected in sequence; the oxygen production equipment also comprises an oxygen storage tank (5), an exhaust pipeline, a vacuum pump (7), a seventh valve (18), and an eighth valve (19); The oxygen production device comprises a valve group, a first adsorption tower (3), and a second adsorption tower (4); The valves in the valve group include a first valve (12), a second valve (13), a third valve (14), a fourth valve (15), a fifth valve (16), and a sixth valve (17); A first air channel (23) is arranged at the top of the first adsorption tower (3), a second valve (13) is arranged on the first air channel (23), and the first air channel (23) is connected to the oxygen storage tank (5); a second air channel is arranged at the bottom of the first adsorption tower (3), a first branch air channel (25) and a second branch air channel (26) are arranged at one end of the second air channel, a sixth valve (17) is arranged on the first branch air channel (25), and a fourth valve (15) is arranged on the second branch air channel (26); the first branch air channel (25) is connected to the air storage tank (2), and the second branch air channel (26) is connected to the exhaust pipeline; A third airway (24) is arranged at the top of the second adsorption tower (4), a first valve (12) is arranged on the third airway (24), and the third airway (24) is connected to the oxygen storage tank (5); a fourth airway is arranged at the bottom of the second adsorption tower (4), a third branch airway and a fourth branch airway are arranged at one end of the fourth airway, a third valve (14) is arranged on the third branch airway, and a fifth valve (16) is arranged on the fourth branch airway; the fourth branch airway is connected to the air storage tank (2), and the third branch airway is connected to the exhaust pipeline; A fifth branch airway (28) and a sixth branch airway (27) are arranged at one end of the exhaust pipeline, an eighth valve (19) is arranged on the fifth branch airway (28), the vacuum pump (7) is arranged on the sixth branch airway (27), and a seventh valve (18) is arranged between the vacuum pump (7) and the exhaust pipeline.

2. An oxygen production equipment according to claim 1, characterized in that: An exhaust muffler (6) is provided at one end of the fifth branch air passage (28).

3. An oxygen production equipment according to claim 1, characterized in that: A vacuum muffler (8) is provided at one end of the sixth branch airway (27).

4. The oxygen production equipment according to claim 1, characterized in that: The valves in the valve group, the seventh valve (18), and the eighth valve (19) are all provided with pilot control valves (11), and the valves in the valve group, the seventh valve (18), and the eighth valve (19) are all pneumatic valves.

5. An oxygen production equipment according to claim 4, characterized in that: The oxygen production equipment is also provided with a control gas circuit (20), and the control gas circuit (20) is connected to the air storage tank (2) and the pilot control valve (11).

6. An oxygen production equipment according to claim 1, characterized in that: The air storage tank (2) and the oxygen storage tank (5) are both provided with a safety valve and a sewage valve.

7. The oxygen production equipment according to claim 1, characterized in that: The air storage tank (2), the first adsorption tower (3), the second adsorption tower (4), and the oxygen storage tank (5) are all provided with a pressure sensor (9) and a pressure gauge (10).

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