Portable oxygenerator and use method thereofTechnical Field
The invention relates to the technical field of molecular sieve pressure swing adsorption oxygen production, in particular to a portable oxygen generator and a use method thereof.
Background
The pressure swing adsorption air separation oxygen production takes zeolite molecular sieve as adsorbent, and adopts pressure swing adsorption Principle (PSA) to separate air at normal temperature to prepare high-purity oxygen, wherein the principle is based on that two gas molecules of oxygen and nitrogen have different diffusion rates on the surface of the molecular sieve, the diffusion rate of gas molecules (O2) with smaller diameter is faster, more gas molecules (N2) with larger diameter enter micropores of the carbon molecular sieve, and the diffusion rate of gas molecules (N2) with larger diameter enters the micropores of the carbon molecular sieve less. The difference of selective adsorptivity of carbon molecular sieve to nitrogen and oxygen is utilized to lead oxygen to be enriched in an adsorption phase in a short time, and nitrogen to be enriched in a gas phase to form oxygen-nitrogen separation, thus obtaining gas phase enriched oxygen. The pressure swing adsorption oxygen generator has the advantages of simplicity, flexibility, low failure rate, easy maintenance, high automation degree, convenient operation, low energy consumption and the like, and is suitable for small and medium-scale air separation oxygen generation occasions.
The existing Pressure Swing Adsorption (PSA) oxygen generating equipment basically adopts a micro air compression pump and various electromagnetic valves to perform gas circuit control, and the equipment is not powered off, so that when the power is insufficient or no power occurs in the field, the oxygen generating equipment can not provide oxygen support in emergency. The existing oxygenerator controls the flow direction and pressure balance time of the compressed air by using the electromagnetic valve, however, along with the improvement of the quality requirement of the oxygenerator, the electromagnetic valve in the prior art cannot accurately control the time, pressure and flow of the compressed air entering the oxygenerator, so that the efficiency of the oxygenerator cannot be improved. Meanwhile, when the valve position is changed in the existing electromagnetic valve control mode, obvious airflow noise can be generated due to the fact that the flow direction and the speed of compressed air are changed.
Disclosure of Invention
The invention provides a portable oxygenerator and a use method thereof aiming at the technical problems.
The technical scheme of the invention is as follows:
A portable oxygenerator comprises an air pressurizing mechanism, a compressed air buffer tank, a first adsorption cabin, a second adsorption cabin, an oxygen buffer cabin and an air path delay switch group;
The air pressurizing mechanism is communicated with the compressed air buffer tank through a pipeline, the compressed air buffer tank is respectively communicated with the first adsorption cabin and the second adsorption cabin through adsorption gas paths, oxygen-making molecular sieves are arranged in the two adsorption cabins, the two adsorption cabins are respectively communicated with the oxygen buffer cabin through flushing gas paths, the two adsorption cabins are also respectively communicated with the oxygen buffer cabin through exhaust gas paths, desorption gas paths are respectively arranged in the two adsorption cabins, and the gas path delay switch group controls the corresponding adsorption gas paths, flushing gas paths, exhaust gas paths and desorption gas paths to be respectively opened and closed through controlling gas path adjusting pieces;
the air pressurizing mechanism comprises an air pressurizing cabin and a piston arranged in the air pressurizing cabin, a roller running cavity and a roller are arranged in the piston, the roller is in contact with the inner wall of the roller running cavity, the roller is fixedly connected with a rocker arm, the piston can reciprocate in the air pressurizing cabin through rotation of the rocker arm, and air is pressed into the compressed air buffer tank.
Preferably, the air passage delay switch group comprises a cam group driving shaft and a plurality of rotating cams fixed on the cam group driving shaft, the cam group driving shaft is connected with the power mechanism, each rotating cam comprises a cam main body and at least one protruding part arranged on the outer peripheral surface of the cam main body, each rotating cam is matched with at least one air passage regulating piece, in the rotating process of the rotating cams, when the air passage regulating pieces are in abutting contact with the protruding parts, the air passage is closed, and when the air passage regulating pieces are staggered with the protruding parts, the air passage is opened.
Preferably, the air path adjusting piece comprises a contact and a valve body connected with the contact, and during rotation of the cam, the contact is contacted with different positions outside the cam to adjust opening and closing of the valve body.
Preferably, the rocker arm is connected to a piston drive shaft, which is in driving connection with the power mechanism.
Preferably, the power mechanism comprises a main driving shaft, a first speed changing gear and a second speed changing gear which are arranged on the main driving shaft, the piston driving shaft is provided with a piston driving shaft gear meshed with the first speed changing gear, and the cam group driving shaft is provided with a gas circuit switch group gear meshed with the second speed changing gear.
Preferably, the main drive shaft is connected to a hand wheel, and the hand wheel is manually operated to rotate the main drive shaft without power.
Preferably, the main drive shaft is connected to a motor that is powered by a battery, which is a variety of portable batteries, such as a lithium battery, a hydrogen fuel cell, or the like.
Preferably, the longitudinal section of the roller running cavity is elliptical or approximately elliptical, the curvature of the curved surface of the shape determines the running speed of the piston, the long axis direction of the shape is perpendicular to the moving direction of the piston, the length of the long axis of the shape is the diameter of the rocker arm, and the short axis length of the shape and the diameter of the rocker arm jointly determine the stroke of the piston.
Preferably, a first external air one-way valve is arranged at the top of the air pressurizing cabin, the top of the air pressurizing cabin is connected with the compressed air buffer tank through a first connecting pipe, the first connecting pipe is provided with a first compressed air one-way valve, a second external air one-way valve is arranged at the bottom of the air pressurizing cabin, the bottom of the air pressurizing cabin is connected with the compressed air buffer tank through a second connecting pipe, and the second connecting pipe is provided with a second compressed air one-way valve.
The oxygen-making molecular sieve is an ultra-efficient lithium molecular sieve particle or a lithium molecular sieve composite material fused with a special high polymer material.
The application method of the portable oxygenerator comprises the following steps:
S1, driving a main driving shaft by using a hand wheel or a motor as power of a power mechanism to enable the power mechanism to rotate at a certain speed;
S2, the power mechanism drives a piston driving shaft through a gear, so that a rocker arm fixed on the piston driving shaft rotates, and the piston is driven to reciprocate up and down in the air pressurizing cabin through the rotation of the rocker arm, so that air is pressed into the compressed air buffer tank;
S3, simultaneously with S2, the power mechanism drives the cam group driving shaft through a gear, so that a rotary cam fixed on the cam group driving shaft starts to work, and the corresponding adsorption gas path, flushing gas path, exhaust gas path and desorption gas path are controlled to be respectively opened and closed through the control gas path adjusting piece, so that the first adsorption cabin and the second adsorption cabin are sequentially subjected to adsorption, flushing, pressure equalizing, exhaust and desorption operations, and continuous oxygen production is realized.
The beneficial effects of the invention are as follows:
(1) The oxygenerator meets the portable requirement, has a simple structure, and occupies small space by adopting only a single air pressurizing cabin and a single piston;
(2) The invention is provided with only one power mechanism, the occupied space is small, the power mechanism can be used for driving the rocker arm to rotate so as to drive the air pressurizing mechanism to work, and can also drive the cam group to drive the driving shaft to rotate so as to drive the gas circuit delay switch group to work, and the power mechanism can provide power in various modes such as a motor, a hand wheel and the like so as to prepare oxygen, and particularly can prepare oxygen in a purely manual mode without electric power;
(3) The cam type gas circuit delay switch group is adopted, a plurality of rotary cams are arranged on the same shaft, so that multi-gas circuit combined time sequence switch control is realized, the cam type gas circuit delay switch group can accurately control the time, pressure and flow of compressed air entering an oxygenerator, the efficiency of the oxygenerator is guaranteed, and in the use process, the first adsorption cabin and the second adsorption cabin are sequentially subjected to operations such as adsorption, flushing, pressure equalizing, exhaust, desorption and the like through the gas circuit delay switch group, so that continuous oxygenerator is realized;
(4) The oxygen generating efficiency of the oxygen generator is 1-100L per minute.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2A is a schematic side view of an air pressurizing mechanism according to the present invention;
FIG. 2B is a schematic front view of the air pressurizing mechanism of the present invention;
FIG. 3A is a schematic side view of an alternative operating state of the air pressurizing mechanism of the present invention;
FIG. 3B is a schematic front view of an alternative operating state of the air pressurizing mechanism of the present invention;
FIG. 4 is a schematic diagram of the gas circuit delay switch set of the present invention;
FIG. 5 is a schematic diagram of a cam controlling the opening and closing of a path of air passage according to the present invention;
FIG. 6 is a schematic view of a cam controlling the opening and closing of a gas path according to the present invention;
FIG. 7 is a schematic diagram of the cam controlled multi-path air path opening and closing of the present invention;
FIG. 8 is a timing diagram of the control of the opening and closing of the multiple air paths by the air path delay switch set of the invention.
The device is characterized by comprising a hand wheel 1, a first speed change gear 2, a gas circuit switch group gear 3, a piston driving shaft gear 4, a second speed change gear 5, a gas circuit delay switch group 6, a 7, a rocker arm 8, an air pressurizing cabin 9, a piston driving shaft 10, a first outside air one-way valve 11, a second outside air one-way valve 12, a first compressed air one-way valve 13, a second compressed air one-way valve 14, a compressed air buffer tank 15, a first adsorption valve 16, a second adsorption valve 17, a first desorption valve 18, a second desorption valve 19, a first adsorption cabin 20, a second adsorption cabin 21, a pressure equalizing valve 22, a first flushing valve 23, a second flushing valve 24, an oxygen buffer cabin 25, a first exhaust valve 26, an oxygen outlet 27, a second exhaust valve 28, a piston 29, a roller 30, a roller running cavity 31, a main driving shaft 32 and a cam group driving shaft.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
As shown in fig. 1, the portable oxygenerator comprises an air pressurizing mechanism, a compressed air buffer tank 14, a first adsorption cabin 19, a second adsorption cabin 20, an oxygen buffer cabin 24 and an air passage delay switch group 6, wherein oxygen-making molecular sieves are arranged in the two adsorption cabins.
The compressed air buffer tank 14 is connected with the first adsorption cabin 19 through a first adsorption air path, the first adsorption air path is provided with a first adsorption valve 15, the first adsorption cabin 19 is connected with a first desorption air path, the first desorption air path is provided with a first desorption valve 17, the compressed air buffer tank 14 is connected with the second adsorption cabin 20 through a second adsorption air path, the second adsorption air path is provided with a second adsorption valve 16, the second adsorption cabin 20 is connected with a second desorption air path, and the second desorption air path is provided with a second desorption valve 18.
The first adsorption chamber 19 is connected with the oxygen buffer chamber 24 through a first flushing gas path and a first exhaust gas path, the first flushing gas path is provided with a first flushing valve 22, the first exhaust gas path is provided with a first exhaust valve 25, the second adsorption chamber 20 is connected with the oxygen buffer chamber 24 through a second flushing gas path and a second exhaust gas path, the second flushing gas path is provided with a second flushing valve 23, the second exhaust gas path is provided with a second exhaust valve 27, the first flushing gas path, the first exhaust gas path, the second flushing gas path and the second exhaust gas path are communicated through a pressure equalizing gas path, and the pressure equalizing gas path is provided with a pressure equalizing valve 21.
The oxygen buffer compartment 24 is provided with an oxygen outlet 26 for supplying oxygen.
The gas circuit delay switch group 6 controls the corresponding adsorption gas circuit, flushing gas circuit, exhaust gas circuit and desorption gas circuit to be respectively opened and closed by controlling the gas circuit adjusting part.
The air pressurizing mechanism comprises an air pressurizing cabin 8, a first external air one-way valve 10 is arranged at the top of the air pressurizing cabin 8, the top of the air pressurizing cabin 8 is connected with a compressed air buffer tank 14 through a first connecting pipe, the first connecting pipe is provided with a first compressed air one-way valve 12, a second external air one-way valve 11 is arranged at the bottom of the air pressurizing cabin 8, the bottom of the air pressurizing cabin 8 is connected with the compressed air buffer tank 14 through a second connecting pipe, and the second connecting pipe is provided with a second compressed air one-way valve 13.
The air pressurizing cabin 8 is internally provided with a piston 28, the piston 28 is internally provided with a roller running cavity 30, the longitudinal section of the roller running cavity 30 is elliptical, the long axis direction of the ellipse is perpendicular to the movement direction of the piston 28, the roller running cavity 30 is internally provided with a roller 29, the roller 29 is in contact with the inner wall of the roller running cavity 30, the roller 29 is fixedly connected with the rocker arm 7, the rocker arm 7 is connected with the piston driving shaft 9, the piston driving shaft 9 is connected with a power mechanism, and the reciprocating movement of the piston 28 in the air pressurizing cabin 8 can be realized through the rotation of the rocker arm 7. As shown in fig. 2A and 2B, the piston 28 moves upward under the drive of the rocker arm 7, so that air above the piston 28 is pressed into the compressed air buffer tank 14, as shown in fig. 3A and 3B, the piston 28 moves under the drive of the rocker arm 7, so that air below the piston 28 is pressed into the compressed air buffer tank 14, and the roller 29 is always in contact with the inner wall of the roller running cavity 30 during the reciprocating movement of the piston 28.
As shown in fig. 4, the air passage delay switch group 6 includes a cam group driving shaft 32, the cam group driving shaft 32 is connected with the power mechanism, the cam group driving shaft 32 is provided with a plurality of rotating cams, each rotating cam includes a cam main body and a protruding portion arranged on the outer peripheral surface of the cam main body, each rotating cam is matched with at least one air passage adjusting member, when the air passage adjusting member is in contact with the protruding portion in the rotating process of the rotating cam, the air passage is closed, and when the air passage adjusting member is dislocated with the protruding portion, the air passage is opened. Specifically, the gas path adjusting piece comprises a contact and a valve body, and the contact is contacted with different positions outside the cam to adjust the opening and closing of the valve body in the rotating process of the cam. For the cam with only one protruding part, the cam is matched with one air passage adjusting piece, the time required for opening and closing the air passage in one rotation period can be adjusted by controlling the proportion of the length of the protruding part to the corresponding circumference, for example, as shown in fig. 5, the length of the protruding part is half of the corresponding circumference, 50% of the time of one period is closed, 50% of the time is opened, if the protruding part rotates for one circle for 10 seconds, the air passage is sequentially controlled to be opened for 5 seconds and closed for 5 seconds, or as shown in fig. 6, the length of the protruding part is 25% of the corresponding circumference, 25% of the time of one period is closed, 75% of the time is opened, and if the protruding part rotates for one circle for 10 seconds, 7.5 seconds is controlled to be opened, 2.5 seconds is closed, and 4.5 seconds is opened. In addition, as shown in fig. 7, a single rotating cam can be matched with a plurality of air channel control pieces, so that the opening and closing conditions of a plurality of air channels are controlled through the single cam, and the cam type air channel time-delay switch group can accurately control the time, pressure and flow of compressed air entering the oxygenerator, thereby being beneficial to ensuring the efficiency of the oxygenerator.
As shown in fig. 1, the power mechanism comprises a main driving shaft 31, the main driving shaft 31 is provided with a first speed change gear 2 and a second speed change gear 5, the piston driving shaft 9 is provided with a piston driving shaft gear 4 meshed with the first speed change gear 2, the cam group driving shaft 32 is provided with a gas circuit switch group gear 3 meshed with the second speed change gear 5, the piston driving shaft 9 is driven to rotate by the meshing of the piston driving shaft gear 4 through the first speed change gear 2, then the driving roller 29 is driven to roll, the cam group driving shaft 32 is driven to rotate by the meshing of the second speed change gear 5, the main driving shaft 31 is connected with a hand wheel 1, the main driving shaft 31 is driven to rotate by manually operating the hand wheel 1 without electric power, the main driving shaft 31 can also be connected with a motor, and the motor is powered by a battery, and the battery is various portable batteries such as a lithium battery, a hydrogen fuel cell and the like. In this embodiment, only one power mechanism is provided, which occupies a small space, and the power mechanism can be used for driving the rocker arm 7 to rotate, further driving the air pressurizing mechanism to work, and also driving the cam set driving shaft 32 to rotate, further driving the air path delay switch set 6 to work, and the power mechanism can provide power through various modes such as a motor, the hand wheel 1 and the like so as to prepare oxygen.
In a preferred embodiment of the present application, 9 rotating cams are provided on the cam group driving shaft 32, each rotating cam is matched with one air passage adjusting member, and the 9 valves are used for performing air passage opening and closing control on the first adsorption valve 15, the second adsorption valve 16, the first desorption valve 17, the second desorption valve 18, the equalizing valve 21, the first flushing valve 22, the second flushing valve 23, the first exhaust valve 25 and the second exhaust valve 27.
The portable oxygenerator of the embodiment utilizes the pressure swing adsorption principle to separate air to prepare high-purity oxygen, and the oxygen-preparing molecular sieve is ultra-efficient lithium molecular sieve particles or lithium molecular sieve composite materials fused with special high polymer materials. In this embodiment, the first adsorption chamber 19 is used as the unit a, the second adsorption chamber 20 is used as the unit B, and the air path delay switch group 6 is used to control the opening and closing of the multi-path air path, and the process of controlling according to the time sequence is shown in fig. 8. The oxygenerator of the embodiment meets the portable requirement, is simple in structure, occupies a small space by adopting only a single air pressurizing cabin 8 and a single piston 28, adopts a cam type air passage time delay switch group 6, is provided with a plurality of rotary cams on the same shaft, realizes multi-air passage combined time sequence switch control, and enables the first adsorption cabin 19 and the second adsorption cabin 20 to sequentially perform operations such as adsorption, flushing, pressure equalizing, exhaust, desorption and the like through the air passage time delay switch group 6 in the use process, so that continuous oxygenerator is realized, and the oxygenerator of the embodiment has oxygen generation efficiency of 1-100L per minute. The portable oxygenerator of the embodiment is used as follows:
S1, driving a main driving shaft 31 by using a hand wheel 1 or a motor as power to enable a power mechanism to rotate at a certain speed;
s2, driving a piston driving shaft 9 by a power mechanism to enable a rocker arm 7 fixed on the piston driving shaft 9 to rotate, and then driving a piston 28 to reciprocate up and down in an air pressurizing cabin 8 through the rotation of the rocker arm 7 to press air into a compressed air buffer tank 14;
S3, simultaneously with S2, the power mechanism drives the cam group driving shaft 32 to rotate, and then drives the gas circuit delay switch group 6 to start working, and controls the corresponding adsorption gas circuit, flushing gas circuit, exhaust gas circuit and desorption gas circuit to be respectively opened and closed by controlling the gas circuit adjusting piece, so that the first adsorption cabin 19 and the second adsorption cabin 20 sequentially perform adsorption, flushing, pressure equalizing, exhaust and desorption operations, and the specific process is as follows with 10S as a period:
When the pressure is 0-2.5s, the first adsorption valve 15 and the first exhaust valve 25 are opened, the second desorption valve 18 is also opened, the rest valves are in a closed state, the pressure in the first adsorption cabin 19 is increased, the adsorption operation is carried out, and the desorption operation is carried out in the second adsorption cabin 20;
during 2.5-4s, the first adsorption valve 15 and the first exhaust valve 25 are continuously opened, the second flushing valve 23 and the second desorption valve 18 are also opened, the rest valves are in a closed state, the adsorption operation is continuously performed in the first adsorption cabin 19, and the desorption operation and the flushing operation are performed in the second adsorption cabin 20;
at the time of 4-5s, the equalizing valve 21 is opened in the first 0.5s, the rest valves are in the closed state, the equalizing valve 21 is closed in the later 0.5s, and the second exhaust valve 27 and the first desorption valve 17 are opened, so that equalizing operation is performed, the pressure in the first adsorption chamber 19 is reduced, and the pressure in the second adsorption chamber 20 is increased;
When 5-7.5s, the second adsorption valve 16 and the second exhaust valve 27 are opened, the first adsorption valve 15 is also opened, the rest valves are in a closed state, the pressure in the second adsorption cabin 20 is increased, the adsorption operation is carried out, and the desorption operation is carried out in the first adsorption cabin 19;
at 7.5-9s, the second adsorption valve 16 and the second exhaust valve 27 are continuously opened, the first flushing valve 22 and the first desorption valve 17 are also opened, the rest valves are in a closed state, the adsorption operation is continuously carried out in the second adsorption cabin 20, and the desorption operation and the flushing operation are carried out in the first adsorption cabin 19;
At 9-10s, the equalization valve 21 is opened for the first 0.5s, the rest of the valves are closed, the equalization valve 21 is closed for the latter 0.5s, and the first exhaust valve 25 and the second desorption valve 18 are opened, so that equalization operation is performed, the pressure in the second adsorption chamber 20 is reduced, and the pressure in the first adsorption chamber 19 is increased.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.