Molecular sieve tower gravity feedback switching type multi-molecular sieve oxygen generator

Abstract

The invention provides a molecular sieve tower gravity feedback switching type multi-molecular sieve oxygenerator, and belongs to the technical field of oxygenerators, the molecular sieve tower gravity feedback switching type multi-molecular sieve oxygenerator comprises an air tank, the air tank is connected with an air compressor, and the air tank is used for storing compressed air provided by the air compressor; the molecular sieve tower group is used for adsorbing and separating nitrogen in compressed air so as to extract high-concentration oxygen; the oxygen tank is used for storing oxygen extracted by the molecular sieve tower group; the molecular sieve tower group comprises a molecular sieve tower and a frame for limiting the reciprocating motion of the molecular sieve tower in the vertical direction, and two ends of the molecular sieve tower are respectively communicated with the oxygen tank and the air tank through hoses. According to the scheme, the gravity change generated by nitrogen adsorption and nitrogen discharge through the molecular sieve tower is reflected on up-down displacement through structural design, and feedback of the touch switch is combined, so that the control system can accurately judge the adsorption condition of the adsorption tower, and the adsorption and desorption states are more accurately switched.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen generators, and in particular to a molecular sieve tower gravity feedback switching type multi-molecular sieve oxygen generator. Background Art

[0002] The oxygen generator adopts physical pressure swing adsorption technology. Its oxygen production principle is mainly to use an air compressor to make the oxygen and nitrogen in the air pass through a molecular sieve, and use the difference in the adsorption capacity of the molecular sieve to nitrogen and oxygen in the air to separate nitrogen and oxygen, thereby obtaining continuous high-concentration oxygen.

[0003] Existing oxygen generators are generally designed with a pair of molecular sieve towers, which are switched cyclically by a dedicated oxygen-generating solenoid valve to ensure that the pair of molecular sieve towers are always in the adsorption and desorption states. In the adsorption state, high-pressure air enters the molecular sieve tower through the air inlet, and nitrogen is adsorbed by the molecular sieve inside the molecular sieve tower, while oxygen can pass through and be discharged from the other outlet; in the desorption state, one end of the molecular sieve tower is connected to the air, and a high-pressure mixed airflow containing a high concentration of oxygen is blown into the other end, driving the adsorbed nitrogen to be discharged into the air.

[0004] The high-pressure air in the adsorption state is generally provided by an air compressor, while the high-pressure mixed air flow containing high-concentration oxygen in the desorption state is provided by the outlet diversion of another molecular sieve tower in the adsorption state. In order to ensure the continuous output of oxygen, a fixed solenoid valve switching time is generally confirmed through experiments, and the oxygen-generating solenoid valve is controlled by electric control to switch stably according to the confirmed solenoid valve switching time to ensure that the molecular sieve tower can be fully adsorbed and desorbed in each cycle. However, this solution has certain defects. The electronic control system cannot accurately determine whether the molecular sieve tower has been completely adsorbed or desorbed. It relies entirely on the empirical data obtained from the previous test to control the switching of the oxygen control solenoid valve. Since it is a pair of molecular sieves working together, there is a mutual influence between them. When the adsorption capacity of one of the molecular sieves decreases, it will cause the entire system to fail, thereby affecting the oxygen concentration. Summary of the invention

[0005] The object of the present invention is to provide a molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator, comprising:

[0008] An air tank, wherein the air tank is connected to an air compressor and is used to store compressed air provided by the air compressor;

[0009] Molecular sieve tower group, which is used to adsorb and separate nitrogen from compressed air to extract high-concentration oxygen;

[0010] An oxygen tank, which is used to store oxygen extracted from the molecular sieve tower group;

[0011] The molecular sieve tower group comprises a molecular sieve tower and a frame for limiting the reciprocating motion of the molecular sieve tower in the vertical direction, the two ends of the molecular sieve tower are respectively connected to the oxygen tank and the air tank through a hose, and the hose between the molecular sieve tower and the air tank is provided with a nitrogen exhaust solenoid valve for exhausting nitrogen during desorption and an air intake solenoid valve for supplying air to the molecular sieve tower during adsorption in sequence;

[0012] An elastic structure is connected between the molecular sieve tower and the frame. The molecular sieve tower has an adsorption position and a desorption position in its travel direction according to changes in its own weight. When adsorption is complete, the weight of the molecular sieve tower increases and descends to the desorption position. When desorption is complete, the weight of the molecular sieve tower decreases and rises through the elastic structure to enter the adsorption position. A switch is also fixedly installed on the frame on the side of the molecular sieve tower. The switch is used to control the opening and closing of the nitrogen exhaust solenoid valve and the air intake solenoid valve according to changes in the working position of the molecular sieve tower.

[0013] As a further improvement, the oxygen tank is provided with an oxygen inlet, an oxygen pressure relief valve and an oxygen outlet, a flow meter is fixedly installed at the oxygen outlet, the air tank is provided with an air pressure relief valve, and an air drying filter is connected between the air tank and the air compressor.

[0014] As a further improvement, a support plate and a limit plate are fixedly installed in the frame, the support plate is provided with a mounting groove, an elastic structure is fixedly installed in the mounting groove, and the elastic structure is fixedly connected to the molecular sieve tower; the limit plate is provided with an avoidance hole that cooperates with the molecular sieve tower, the avoidance hole is used for the molecular sieve tower to pass through, and limits the molecular sieve tower to only reciprocating motion in the vertical direction.

[0015] As a further improvement, the elastic structure is a spring, a spring sheet or a bellows.

[0016] As a further improvement, the switch includes a vertical plate with a notch and a circular plate installed concentrically with the molecular sieve tower, the vertical plate is fixedly installed on the support plate, the circular plate is fixedly installed on the outside of the molecular sieve tower, the side of the circular plate is located between the notches of the vertical plate, and touch switch 1 is installed correspondingly on the upper side inside the notch of the vertical plate and the top surface of the circular plate, and touch switch 2 is installed correspondingly on the bottom surface of the circular plate and the lower side inside the notch of the vertical plate.

[0017] As a further improvement, the touch switch 1 is electrically connected to the intake solenoid valve, the touch switch 2 is electrically connected to the nitrogen exhaust solenoid valve, and the touch switch 1 and the touch switch 2 are interlocked, that is, when the touch switch 1 is closed, the touch switch 2 is disconnected, at which time the intake solenoid valve is opened and the nitrogen exhaust solenoid valve is closed, and vice versa.

[0018] As a further improvement, the hoses at both ends of the molecular sieve tower are in a non-tightened state, the nitrogen exhaust solenoid valve is fixedly installed on the hose between the molecular sieve tower and the air intake solenoid valve through a tee, and the nitrogen exhaust solenoid valve is connected to the air.

[0019] As a further improvement, the air intake solenoid valve and the nitrogen exhaust solenoid valve are designed as normally closed solenoid valves.

[0020] The beneficial effects of the above technical solution of the present invention are as follows:

[0021] This solution uses the gravity changes caused by the molecular sieve tower adsorbing and discharging nitrogen, which are reflected in the up and down displacement through structural design. Combined with the feedback of the touch switch, the control system can accurately judge the adsorption status of the adsorption tower, thereby controlling the actions of the air intake solenoid valve and the nitrogen exhaust solenoid valve according to the adsorption status, so that it can switch the adsorption and desorption states more accurately. In addition, due to the independent controllability of each adsorption tower group, any number of adsorption tower groups can be combined, and the decrease in the adsorption capacity of any adsorption tower group will not affect the overall system, making the actual application more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the framework structure of the present invention;

[0025] Figure 3 It is a front view of the overall structure of the present invention;

[0026] Figure 4 for Figure 3 A magnified view of middle;

[0027] Figure 5 for Figure 3 Enlarged view of middle B;

[0028] Figure 6 It is a schematic diagram of the operation cycle of the present invention;

[0029] Figure 7 It is the control logic diagram of the present invention.

[0030] Description of reference numerals:

[0031] 1. Air compressor; 2. Air tank; 21. Air pressure relief valve; 22. Air drying filter; 3. Oxygen tank; 31. Oxygen inlet; 32. Oxygen pressure relief valve; 33. Oxygen outlet; 34. Flow meter; 4. Molecular sieve tower group; 41. Molecular sieve tower; 411. Hose; 412. Nitrogen exhaust solenoid valve; 413. Air intake solenoid valve; 414. Spring; 42. Frame; 421. Support plate; 422. Limit plate; 423. Mounting groove; 424. Avoidance hole; 43. Switch; 431. Round plate; 432. Vertical plate; 433. Touch switch one; 434. Touch switch two. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the prior art, oxygen generators are generally designed with a pair of molecular sieves, which are always kept in the adsorption and desorption states during operation to ensure the continuous output of oxygen. To achieve the above purpose, the oxygen generator is mainly completed by switching the solenoid valves corresponding to the molecular sieves through the electronic control system. However, the electronic control system can only rely on the empirical data obtained from the previous test to control the switching of the solenoid valves, and cannot accurately determine whether the molecular sieves have been completely adsorbed or desorbed. When the adsorption capacity of one of the molecular sieves decreases, the entire system will fail, thereby affecting the oxygen concentration.

[0035] In view of the above problems, this solution designs a molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator. When the molecular sieve tower 41 does not adsorb nitrogen, its mass is the lightest. At this time, the molecular sieve tower 41 is in the adsorption position (such as Figure 5 As shown), the touch switch 433 is closed, the air intake solenoid valve 413 is opened and the nitrogen exhaust solenoid valve 412 is closed, and the high-pressure air flows into the molecular sieve tower 41, the nitrogen is adsorbed and the oxygen is discharged into the oxygen tank 3 for storage. This process is the adsorption state, and the weight of the molecular sieve tower 41 gradually increases with the increase of the nitrogen adsorption amount;

[0036] In the desorption state, the weight of the molecular sieve tower 41 increases and gradually decreases under the action of gravity. When the molecular sieve tower 41 absorbs nitrogen fully, the molecular sieve tower 41 moves to the desorption position (such as Figure 4 As shown), the touch switch 2 434 is closed, at this time the air intake solenoid valve 413 is closed and the nitrogen exhaust solenoid valve 412 is opened. Due to the high pressure in the oxygen tank 3, oxygen enters the molecular sieve tower 41, driving the adsorbed nitrogen to be discharged to the outside air through the nitrogen exhaust solenoid valve 412. In this process, the weight of the molecular sieve tower 41 is gradually reduced, and it returns to the adsorption position under the action of the elastic structure;

[0037] The molecular sieve tower 41 stably cycles between the adsorption state and the desorption state through the above process, thereby achieving the purpose of stable cyclic oxygen production.

[0038] Regarding the mass change of the molecular sieve tower 41 during complete adsorption, it has been calculated, taking the existing 10L oxygen generator as an example: the weight of a general molecular sieve is about 1kg, the output oxygen flow rate is 10L / min, the ratio of nitrogen to oxygen in the air is about 1:4, that is, the adsorbed nitrogen flow rate is about 40L / min, and since the nitrogen density is 1.25g / L, the mass of the adsorbed nitrogen is about 50g (1.25g / L×40L / min); a conventional oxygen generator uses two molecular sieve towers 41 for cyclic adsorption, then the adsorption mass of a single molecular sieve tower 41 is about 25g, and the adsorption time is 30s. Generally, the single-cycle adsorption process of a single molecular sieve tower 41 is about 8s (empirical data), then the number of adsorption cycles of each molecular sieve tower 41 is about 3.75 times (30 / 8), and the weight adsorbed by a single molecular sieve tower 41 in a single cycle is about 6.7g (25 / 3.75). In summary, the mass change of a single molecular sieve tower 41 of an existing 10L oxygen generator before and after a single cycle of adsorption is about 6.7 g, which is sufficient to meet the gravity change requirement for the switching of the solenoid valve.

[0039] It should be noted that the operation of the molecular sieve tower 41 is based on the above logic and operates independently. In addition, assuming that the amount of oxygen produced by the molecular sieve tower 41 is O1, the amount of oxygen output at the rated flow rate of the oxygen tank 3 is O2, and the oxygen consumption required for the molecular sieve tower 41 to fully discharge nitrogen is O3, then O1=O2+O3, and O1≥O3 can be obtained, that is, it is only necessary to fill the oxygen tank 3 with pure oxygen in the preparation stage, and then rely on the normal operation of the molecular sieve tower 41 to ensure the continuous supply of oxygen.

[0040] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0041] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0042] Embodiment 1 of a molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator provided by the present invention:

[0043] like Figure 1-5 As shown, a molecular sieve tower 41 gravity feedback switching multi-molecular sieve oxygen generator includes an air tank 2, a molecular sieve tower group 4 and an oxygen tank 3. In order to ensure the stability of the structure, in this embodiment, the air tank 2 and the oxygen tank 3 are fixedly installed on the frame 42, wherein the air tank 2 is located at the bottom of the frame 42, and the oxygen tank 3 is placed on the top of the frame 42; in other embodiments, the air tank 2 and the oxygen tank 3 may not be fixedly installed with the frame 42, or the air tank 2 may be installed at the top of the frame 42, and the oxygen tank 3 may be installed at the bottom of the frame 42.

[0044] like Figure 1 As shown, the air tank 2 is connected to the air compressor 1. The compressed air generated by the air compressor 1 is stored in the air tank 2 and provides a stable air source for the oxygen generator system. An air drying filter 22 is also installed between the air tank 2 and the air compressor 1 to dry and filter the air to prevent the air humidity entering the molecular sieve tower 41 from being unstable, thereby affecting the accuracy of the weight change of the molecular sieve tower 41; in addition, an air pressure relief valve 21 is fixedly installed on the air tank 2 to prevent the pressure in the air tank 2 from being too high and ensure the safety of the operation of the device.

[0045] An oxygen inlet 31, an oxygen pressure relief valve 32 and an oxygen outlet 33 are fixedly installed on the oxygen tank 3. A one-way valve (not shown in the figure) is fixedly installed at the oxygen inlet 31 for unidirectionally charging oxygen into the oxygen tank 3, which can prevent the oxygen in the oxygen tank 4 from leaking. The oxygen pressure relief valve 32 is used to ensure the safety of the device and prevent the pressure in the oxygen tank 3 from being too high. A flow meter 34 is fixedly installed at the oxygen outlet 33 for adjusting the output flow of oxygen to provide a stable source of oxygen for the outside world.

[0046] In this embodiment, the pressure relief pressure of the oxygen pressure relief valve 32 is 140-160Kpa, the pressure relief pressure of the air pressure relief valve 21 is set to 200-220Kpa, and the pressure of the air tank 2 is always higher than the pressure of the oxygen tank 3 to ensure that the air tank 2 can provide a stable source of compressed air to the oxygen tank 3 in one direction.

[0047] like Figure 1-3As shown, the molecular sieve tower group 4 includes a frame 42 and a molecular sieve tower 41. A support plate 421 and a limit plate 422 are fixedly installed in the frame 42 from bottom to top. A mounting groove 423 is provided on the support plate 421. An elastic structure is fixedly installed in the mounting groove 423. The elastic structure is fixedly installed on the molecular sieve tower 41. An avoidance hole 424 cooperating with the molecular sieve tower 41 is provided on the limit plate 422. The molecular sieve tower 41 passes through the avoidance hole 424. The avoidance hole 424 limits the molecular sieve tower 41 to reciprocate only in the vertical direction.

[0048] In this embodiment, the elastic structure is a spring 414, which is sleeved on the lower part of the molecular sieve tower 41 and fixedly connected to the circular plate 431; in other embodiments, the elastic structure may also be a spring, a bellows or other flexible elements.

[0049] Several molecular sieve towers 41 can be set up. The top of the molecular sieve tower 41 is connected to the oxygen tank 3 through a hose 411, and the bottom of the molecular sieve tower 41 is also connected to the air tank 2 through a hose 411. In order to ensure that the molecular sieve tower 41 can reciprocate in the vertical direction, the two hoses 411 are in a non-tensioned state.

[0050] In addition, an air intake solenoid valve 413 is connected to the hose 411 between the molecular sieve tower 41 and the air tank 2. The air intake solenoid valve 413 is used to deliver compressed air to the molecular sieve tower 41 during adsorption. A nitrogen exhaust solenoid valve 412 is connected between the molecular sieve tower 41 and the air intake solenoid valve 413 through a three-way connection. The open end of the nitrogen exhaust solenoid valve 412 is connected to the air and is used to exhaust the nitrogen in the molecular sieve tower 41 during desorption. The air intake solenoid valve 413 and the nitrogen exhaust solenoid valve 412 are both normally closed solenoid valves.

[0051] like Figure 3-5 As shown, a switch 43 is installed on the frame 42 on the side of the molecular sieve tower 41. The switch 43 includes a vertical plate 432 with a notch and a circular plate 431 installed concentrically with the molecular sieve tower 41. The vertical plate 432 is fixedly installed on the support plate 421, and the circular plate 431 is fixedly installed on the outside of the molecular sieve tower 41. The side of the circular plate 431 is located between the notches of the vertical plate 432. A touch switch 1 433 is installed correspondingly on the upper side of the notch inside the vertical plate 432 and the top surface of the circular plate 431. The touch switch 1 433 is electrically connected to the air intake solenoid valve 413; a touch switch 2 434 is installed correspondingly on the bottom surface of the circular plate 431 and the lower side of the notch inside the vertical plate 432. The touch switch 2 434 is electrically connected to the nitrogen exhaust solenoid valve 412.

[0052] In this embodiment, touch switch 1 433 and touch switch 2 434 are interlocked, that is, when touch switch 1 433 is closed, touch switch 2 434 is disconnected, at which time the air intake solenoid valve 413 is opened and the nitrogen exhaust solenoid valve 412 is closed, and vice versa.

[0053] like Figure 6-7As shown, the molecular sieve tower 41 is used to adsorb and separate nitrogen in compressed air, thereby extracting high-concentration oxygen. When the molecular sieve tower 41 adsorbs and desorbs nitrogen, its own weight will change, that is, the molecular sieve tower 41 has adsorption sites (such as Figure 5 ) and desorption sites (such as Figure 4 Its control logic is as follows: Figure 7 As shown, the touch switch 1 433 is closed, the molecular sieve tower 41 is in the adsorption position, the air intake solenoid valve 413 is opened and the nitrogen exhaust solenoid valve 412 is closed, the compressed air enters the molecular sieve tower 41, the nitrogen is adsorbed, and the oxygen enters the oxygen tank 3. In this process, the weight of the molecular sieve tower 41 gradually increases, and the molecular sieve tower 41 moves downward until the touch switch 2 434 is closed; the touch switch 2 434 is closed, the molecular sieve tower 41 is in the desorption position, at this time the adsorption is completed, the air intake solenoid valve 413 is closed and the nitrogen exhaust solenoid valve 412 is opened, due to the higher pressure in the oxygen tank 3, oxygen enters the molecular sieve tower 41, prompting the adsorbed nitrogen to be discharged to the outside air through the nitrogen exhaust solenoid valve 412, in this process, the weight of the molecular sieve tower 41 gradually decreases, and it moves upward under the action of the spring 414 until the touch switch 1 433 is closed.

[0054] The molecular sieve tower 41 stably cycles between the adsorption state and the desorption state through the above process, thereby achieving the purpose of stable cyclic oxygen production.

[0055] In addition, the present invention can be set to a variety of operating methods according to different application scenarios and situations. The operating method of this embodiment, one:

[0056] In the preparation stage, the electronic control system (not shown) first controls the air intake solenoid valve 413 and the nitrogen exhaust solenoid valve 412 to be in a closed state, and then the air compressor 1 starts and begins to fill the air tank 2 with compressed air until the air solenoid valve is in a pressure relief state, at which time the air tank 2 is in a stable high pressure state;

[0057] In order to ensure that the oxygen generator can be started smoothly, the oxygen tank 3 needs to be pre-filled with pure oxygen so that the pressure in the oxygen tank 3 is higher than the atmospheric pressure but slightly lower than the pressure relief pressure of the oxygen pressure relief valve 32. There are two ways to fill the oxygen tank 3 with oxygen: first, connect an oxygen cylinder to the oxygen inlet 31 to directly fill the oxygen tank 3 with pure oxygen; second, the electronic control system first controls the molecular sieve tower 41 to produce oxygen according to the conventional oxygen production logic, and fills the generated oxygen into the oxygen tank 3. When the oxygen concentration measured at the outlet of the oxygen tank 3 is qualified, the electronic control system controls the switch to the control logic oxygen production mode in this scheme;

[0058] After the preparation phase is completed, the operation phase begins. In the initial state, the unadsorbed molecular sieve tower 41 is in the adsorption position, at which time the air inlet solenoid valve 413 is opened and the nitrogen exhaust solenoid valve 412 is closed, and the oxygen generator produces oxygen according to the control logic of the present invention.

[0059] At the end stage, the electric control system controls the nitrogen exhaust solenoid valve 412 to open, while the air intake solenoid valve 413 is closed, and the oxygen in the oxygen tank 3 enters the molecular sieve tower 41 for desorption, until the nitrogen is completely discharged through the nitrogen exhaust solenoid valve 412. At this time, the molecular sieve tower 41 is in the adsorption position (i.e., the initial state). Subsequently, the electric control system controls the nitrogen exhaust solenoid valve 412 and the air intake solenoid valve 413 to close, and the oxygen generator stops running.

[0060] This method is suitable for scenarios that require high consistency and predictability, such as medical equipment, precision industrial processes, etc. This method improves the safety and rapid response capabilities of the system.

[0061] The operating method of this embodiment, second:

[0062] The main difference between this operation method and the above method lies in the operation mode when the end phase and the operation phase are restarted. This method simplifies the startup procedure of the equipment and improves efficiency.

[0063] At the end stage, when the oxygen generator needs to be stopped, the electronic control system will directly close the air intake solenoid valve 413 and the nitrogen exhaust solenoid valve 412 without performing a complete desorption process. At this time, the electronic control system will record the state of the molecular sieve tower 41 (i.e., whether they are currently in an adsorption state or a desorption state) so that the previous cycle can be continued when the machine is turned on next time.

[0064] During the operation phase, when the oxygen generator is restarted, the electronic control system first reads the status information of the molecular sieve tower 41 recorded when it was shut down last time. According to the read status, the electronic control system will control the actions of the air intake solenoid valve 413 and the nitrogen exhaust solenoid valve 412 accordingly, so that the oxygen generator continues the oxygen production process from the position where it was interrupted last time. Its logic is carried out in accordance with the control logic of the present invention.

[0065] Since the molecular sieve tower 41 does not need to be completely desorbed every time it is started, this method greatly simplifies the startup procedure and reduces unnecessary waiting time. After shutdown, the oxygen in the oxygen tank 3 still maintains a certain pressure. When it is used again, it does not need to be replenished or only needs to be replenished in a small amount, which saves energy and improves the response speed of the system.

[0066] This method is particularly suitable for application scenarios that require frequent start and stop but require rapid response, such as on-site oxygen supply needs in medical, industrial and other fields. This method improves the efficiency and flexibility of the system and reduces unnecessary downtime and waste of resources.

[0067] The above-mentioned electric control system and conventional oxygen production logic are both existing technical means and will not be described in detail here.

[0068] The above-mentioned ideal embodiments of the present invention are used as inspiration, but it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The attached claims are intended to define the scope of protection of the present invention, and therefore cover the modular composition, equivalent or alternatives within the scope of protection of these claims.

Claims

1. A molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator, comprising: An air tank (2), wherein the air tank (2) is connected to the air compressor (1), and the air tank (2) is used to store compressed air provided by the air compressor (1); A molecular sieve tower group (4) is used to absorb and separate nitrogen from compressed air, thereby extracting high-concentration oxygen; An oxygen tank (3) for storing oxygen extracted by the molecular sieve tower group (4); The molecular sieve tower group (4) comprises a molecular sieve tower (41) and a frame (42) for limiting the reciprocating motion of the molecular sieve tower (41) in the vertical direction, the two ends of the molecular sieve tower (41) are respectively connected to the oxygen tank (3) and the air tank (2) through a hose (411), and the hose (411) between the molecular sieve tower (41) and the air tank (2) is provided with a nitrogen exhaust solenoid valve (412) for exhausting nitrogen during desorption and an air intake solenoid valve (413) for supplying air to the molecular sieve tower (41) during adsorption. An elastic structure is connected between the molecular sieve tower (41) and the frame (42). The molecular sieve tower (41) has an adsorption position and a desorption position in its travel direction according to changes in its own weight. When adsorption is complete, the weight of the molecular sieve tower (41) increases and it descends to the desorption position. When desorption is complete, the weight of the molecular sieve tower (41) decreases and it ascends through the elastic structure to the adsorption position. A switch (43) is also fixedly mounted on the frame (42) on the side of the molecular sieve tower (41). The switch (43) is used to control the opening and closing of the nitrogen exhaust solenoid valve (412) and the air intake solenoid valve (413) according to changes in the working position of the molecular sieve tower (41).

2. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 1, characterized in that: The oxygen tank (3) is provided with an oxygen inlet (31), an oxygen pressure relief valve (32) and an oxygen outlet (33); a flow meter (34) is fixedly installed at the oxygen outlet (33); the air tank (2) is provided with an air pressure relief valve (21); and an air drying filter (22) is connected between the air tank (2) and the air compressor (1).

3. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 1, characterized in that: A support plate (421) and a limiting plate (422) are fixedly installed in the frame (42); a mounting groove (423) is provided on the support plate (421); an elastic structure is fixedly installed in the mounting groove (423); and the elastic structure is fixedly connected to the molecular sieve tower (41); and a avoidance hole (424) cooperating with the molecular sieve tower (41) is provided on the limiting plate (422); the avoidance hole (424) is used for the molecular sieve tower (41) to pass through, and limits the molecular sieve tower (41) to only be able to perform reciprocating motion in the vertical direction.

4. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 3, characterized in that: The elastic structure is a spring (414), a spring sheet or a bellows.

5. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 1, characterized in that: The switch (43) comprises a vertical plate (432) with a notch and a circular plate (431) installed concentrically with the molecular sieve tower (41); the vertical plate (432) is fixedly installed on the support plate (421); the circular plate (431) is fixedly installed on the outer side of the molecular sieve tower (41); the side of the circular plate (431) is located between the notches of the vertical plate (432); a touch switch 1 (433) is installed correspondingly on the upper side of the notch inside the vertical plate (432) and the top surface of the circular plate (431); and a touch switch 2 (434) is installed correspondingly on the bottom surface of the circular plate (431) and the lower side of the notch inside the vertical plate (432).

6. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 5, characterized in that: The touch switch 1 (433) is electrically connected to the air intake solenoid valve (413), and the touch switch 2 (434) is electrically connected to the nitrogen exhaust solenoid valve (412), and the touch switch 1 (433) and the touch switch 2 (434) are interlocked, that is, when the touch switch 1 (433) is closed, the touch switch 2 (434) is disconnected, at which time the air intake solenoid valve (413) is opened and the nitrogen exhaust solenoid valve (412) is closed, and vice versa.

7. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 1, characterized in that: The hoses (411) at both ends of the molecular sieve tower (41) are in a loose state, and the nitrogen exhaust solenoid valve (412) is fixedly installed on the hose (411) between the molecular sieve tower (41) and the air intake solenoid valve (413) through a three-way connection, and the nitrogen exhaust solenoid valve (412) is connected to the air.

8. The molecular sieve tower gravity feedback switching multi-molecular sieve oxygen generator according to claim 1, characterized in that: The air intake solenoid valve (413) and the nitrogen exhaust solenoid valve (412) are designed as normally closed solenoid valves.

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