JP2011104227A - Oxygen concentrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen concentrator in which low vibration, low noise and a simple structure can be achieved, and power consumption can be reduced by using a rotary cylinder device of which the compressor has a combination of a rotary motion with a reciprocating linear motion. <P>SOLUTION: A compressor 105 includes a rotary cylinder device 300 which forms a compressed-air-generating part 105a and a negative-pressure-air-generating part 105b alternately, by reciprocating motion of linear-motion pistons 301 and 302 within the cylinder 321 which are linked to a core-deviated cylindrical body 303 revolving around a crank axis 308 which is deviated from the axial core of a driving axis 331. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oxygen concentrator, and more particularly to an oxygen concentrator that reduces power consumption with low vibration and low noise.

  The oxygen concentrator is used in an oxygen inhalation method effective as a treatment method for patients with respiratory diseases such as chronic bronchitis. As this oxygen concentrator, an adsorption method using a zeolite that permeates oxygen in the air and selectively adsorbs nitrogen as an adsorbent is widely used.

  This type of oxygen concentrating device controls the drive of the motor that constitutes the compressor to concentrate oxygen to 90% or more from the raw air and supplies the concentrated oxygen to the patient from the nasal cannula, thereby causing chronic bronchitis and the like. It is used for the treatment of patients with respiratory diseases (Patent Document 1).

JP 2002-45424 A

In general, a compressor used in an oxygen concentrator uses a swing type pump that swings a piston mainly by driving a motor, so that vibration and noise due to swing of the piston are large. For this reason, taking into account the use of oxygen concentrators at home or in hospitals by patients with respiratory illnesses, it is necessary to take anti-vibration measures and sound-proof measures, which makes the device structure complicated and large. End up.
In addition, energy loss due to the reciprocating motion of the piston in the cylinder tends to decrease the energy conversion efficiency. Therefore, especially when the patient is installed and used at home, the power consumption increases. The burden becomes heavy.

  An object of the present invention is to provide an oxygen concentrator capable of simplifying the structure with low vibration and low noise and reducing power consumption by using a rotary cylinder device combining rotary motion and reciprocating motion with a compressor. It is to provide.

In order to achieve the above object, the present invention has the following configuration.
An oxygen concentrator comprising: a compressor that compresses raw material air to generate compressed air; and an adsorption cylinder that stores an adsorbent that adsorbs nitrogen from the compressed air sent from the compressor. The linear motion piston connected to the eccentric cylindrical body rotating around the crankshaft eccentric with respect to the axis of the drive shaft reciprocates in the cylinder, so that the compressed air generating portion and the negative pressure air generating portion are It is characterized by comprising rotary cylinder devices that are alternately formed.

  Further, the rotary cylinder device is assembled eccentrically with respect to an axis of a shaft coupled to the drive shaft, and is assembled so as to be rotatable around the shaft via a first virtual crank arm. A plurality of second virtual crankshafts are assembled eccentrically with respect to the crankshaft and the axis of the first crankshaft, and are assembled rotatably about the first crankshaft via the second virtual crankarm. The eccentric cylinder, a piston complex in which a plurality of pistons are assembled to the eccentric cylinder around the second virtual crankshaft, and the first crankshaft is assembled around the shaft. And a balance weight that balances the mass of rotational motion about the shaft including the piston complex, and the shaft is rotatably supported by the piston, A main body case assembled with a cylinder for accommodating a plurality of pistons in a reciprocating manner. When the shaft is driven to rotate, a rotation trajectory defined by the first virtual crank arm is moved to the first crank. The shaft rotates and the second virtual crankshaft rotates around the first virtual crankshaft without apparently sliding on the rotation path defined by the second virtual crankarm. As described above, a plurality of pistons assembled so as to intersect the eccentric cylindrical body reciprocate in the cylinder.

  Here, the first virtual crank arm refers to a portion corresponding to the distance between the shaft and the center axis of the first crankshaft, and means that the existence of the crank arm is structurally recognized even if the crank arm is omitted. The second virtual crank arm is a portion corresponding to the distance between the center axes of the first crank shaft and the second virtual crank shaft, and the presence of the crank arm on the mechanism is recognized even if the crank arm is omitted. Say. The second virtual crankshaft is a crankshaft in which the existence of an axis serving as the center of rotation is virtually recognized even if no crankshaft is present on the mechanism.

  The eccentric cylindrical body has a first cylindrical body fitted concentrically with the first crankshaft, and a second virtual crankshaft eccentric with respect to the axial center of the first cylindrical body. A second cylinder formed continuously in the axial direction is provided, and the plurality of pistons intersect with the second cylinder so as to be rotatable.

  The piston complex may be assembled with the eccentric cylinder so that a plurality of pistons overlap each other at an intersection.

  Further, a distance r between the shaft centers of the shaft and the first crankshaft is defined as an arm length of the first virtual crankarm and the second virtual crankarm, and a first virtual crankarm length r around the shaft core of the shaft is a radius. The second virtual crankshaft appears on a virtual circle whose radius is the second virtual crankarm length r centered on the first crankshaft when the first crankshaft rotates on the rotation trajectory By rotating upward, the plurality of pistons reciprocate in the radial direction of the rolling circle whose radius is the diameter R (2r) of the virtual circle.

  The oxygen concentrating device according to the present invention includes a rotary cylinder device as a compressor, so that the eccentric cylindrical body that is eccentrically connected to the axis of the drive shaft rotates and moves. The linear piston connected to the cylinder reciprocates in the cylinder, so that the structure can be simplified with low vibration and noise, and the compressor components are assembled around the drive shaft for constant speed rotation. Therefore, there is little loss and energy conversion efficiency can be improved and power consumption can also be reduced.

  In addition, since a balance weight that balances the mass of rotational motion about the shaft including the first crankshaft and the piston complex is assembled, the first crankshaft is centered on the shaft, and the piston is centered on the first crankshaft. Even if the complex rotates with the reciprocating motion of the piston, the vibration can be suppressed and noise reduction can be achieved. Therefore, the vibration-proof structure of the compressor can be simplified, and the oxygen concentrator can be made quieter and smaller and lighter.

  In addition, the compressor mounting structure of the compressor can be simplified by omitting mechanical parts such as a crankshaft and a crank arm and reducing the rotational vibration described above.

Furthermore, the piston complex can be assembled compactly in the height direction and the radial direction by reciprocating a plurality of pistons on the same plane, and the compressor can be downsized.
Therefore, an oxygen concentrator with excellent portability can be provided.

  Further, the first crankshaft rotates around a shaft in a concentric circular orbit, and a plurality of pistons move along a rotation locus (internal cycloid) in which the second virtual crankshaft rotates around the first crankshaft. Since it reciprocates, it is possible to provide an efficient oxygen concentrator with good rotational balance, low vibration and low noise.

It is the external appearance perspective view which looked at the oxygen concentrating device 1 which is one Embodiment of this invention from the diagonally upper left of the front side. It is a rear view of the oxygen concentrator 1 shown in FIG. It is an external appearance perspective view of the extension tube set of a nasal cannula. FIG. 2 is a substantial view of an operation panel 5 of the oxygen concentrator 1 of FIG. 1. 4A is an operation explanatory diagram of the battery remaining amount display unit 128d of the operation panel 5 in FIG. 4, FIG. 4B is an operation explanatory diagram of the alarm display unit 128c of the operation panel 5 in FIG. 4, and FIG. 4 is an operation explanatory diagram of an oxygen concentration lamp 128b of the operation panel 5 of FIG. (A) is an external perspective view showing how the outside air introduction filter 20 is detachable from the back cover 3 of the oxygen concentrator 1, and (b) is a state where the outside air introduction filter 20 is further removed from the replacement lid 17. FIG. 6C is an external perspective view showing a cross-sectional view taken along the line XX in FIG. 2 is a block diagram that also serves as a piping diagram of the oxygen concentrator 1. FIG. 3 is a three-dimensional exploded view showing an internal configuration of the oxygen concentrator 1. FIG. 3 is a three-dimensional exploded view seen from the bottom surface side to show the bottom cover 41 and the base body 40 of the oxygen concentrator 1. FIG. 4 is an external perspective view showing a process of fixing the front and back covers 2 and 3 to the internal structure after assembly of the oxygen concentrator 1. FIG. It is a side view which shows the process of fixing the front and back covers 2 and 3 with respect to the internal structure of the oxygen concentration apparatus 1 after an assembly. 2 is an external perspective view showing a part of the two-stage soundproof chamber 34 with a part broken away in order to show the internal configuration. FIG. It is a perspective view of a rotary cylinder device. It is the perspective view which removed the 1st main body case of the rotary cylinder apparatus of FIG. FIG. 14 is an axial sectional perspective view of the rotary cylinder device of FIG. 13. It is a disassembled perspective view of a rotary cylinder apparatus. It is a model principle figure which shows the relationship between the rotational motion of the 1st crankshaft centering on a shaft and a 2nd virtual crankshaft, and the reciprocating motion of several crank arms. It is the top view which removed the 1st main body case applied to the compressor, the Z-axis direction sectional view of a compressor, and the Z-axis direction sectional view containing the crossing piston. It is a front view of the 1st crankshaft. It is a front view, a top view, and a bottom view of the first balance weight. It is a front view, a top view, and a bottom view of the second balance weight. It is the top view and X-axis direction sectional drawing of an eccentric cylinder. It is the top view and X-axis direction sectional drawing of a 1st main body case. It is the top view and X-axis direction sectional drawing of a 2nd main body case. It is a top view of a piston, a Y-axis direction sectional view, a front view, a right side view, and a bottom view. It is the top view and X-axis direction sectional drawing of a cylinder. It is the top view of a cylinder seal cup, and a X-axis direction half sectional view. It is the top view and X-axis direction sectional drawing of a seal presser. It is the state of the shaft rotation position of the state where the 1st main part case was removed, and the state of planar view of the piston. It is the state figure which planarly viewed the shaft rotation position and piston of the state which removed the 1st main body case. It is the state figure which planarly viewed the shaft rotation position and piston of the state which removed the 1st main body case. It is the state figure which planarly viewed the shaft rotation position and piston of the state which removed the 1st main body case.

Hereinafter, an embodiment for carrying out the invention will be described in detail with reference to the accompanying drawings.
Hereinafter, a portable oxygen concentrator having a total weight of about 10 to 15 kg will be described as an example of the oxygen concentrator. Here, the present invention can be variously modified and changed, such as a portable oxygen concentrator having a total weight of about 2 to 3 kg and an oxygen concentrator having a total weight exceeding 15 kg, and specific examples are illustrated in the drawings. However, the present invention is not limited to these, and various configurations are possible within the scope defined in the claims.

<Description of Overall Configuration of Oxygen Concentrator 1>
First, FIG. 1 is an external perspective view of a portable pressure swing adsorption type portable oxygen concentrator 1 according to an embodiment as viewed from the upper left diagonal. FIG. 2 is a rear view of the portable oxygen concentrator 1 shown in FIG.

  As shown in FIGS. 1 and 2, the portable oxygen concentrator 1 has a smart travel bag-like appearance that looks slender and slender in the vertical direction in order to minimize the installation location. For this reason, consideration is given so that it is not known to others that the portable oxygen concentrator 1 is a glance.

  Further, as will be described later, the illustrated front cover 2 and back cover 3 for forming a hermetic cover are made of injection-molded resin parts, and a plurality of adsorbing cylinders arranged in parallel filled with an adsorbent (in this embodiment, 2 The other components including this) were also reduced in weight as much as possible to reduce the total weight to about 10 kg (when the carrier 10 is not provided using an AC power source). As a result, the handle 4 having a strength sufficient to withstand the force of lifting the portable oxygen concentrator 1 that becomes a handle part for making a so-called portable type that can be carried by one hand with an adult is provided upward as shown in the figure. Design features.

  Further, the outer dimensions of the portable oxygen concentrator 1 are rounded as a whole. Specifically, the width W is 350 mm × the depth D is 250 mm × the height H is 550 mm. For this reason, since the occupation area on a floor surface can be made as small as possible, the above-mentioned weight reduction and downsizing are achieved. Further, as a design feature of the portable oxygen concentrator 1, a front cover 2 that covers the front surface of the portable oxygen concentrator 1 three-dimensionally from the installation floor is handled as shown in FIG. While the accent line continuous to the bottom surface of 4 is integrally formed in a concave shape in the vertical direction on the left and right, the portion sandwiched between these accent lines is a light warm color system, and the operation panel 5 of the same color system is disposed above this, The remaining part including the back cover 3 has a beige or cream color.

  By adopting a so-called two-tone modern design with the above design and color scheme, when the portable oxygen concentrator 1 is installed indoors, it can be harmonized with other furniture such as furniture. Consideration. Further, the front cover 2 and the back cover 3 are made of, for example, ABS resin, which is a thermoplastic resin having impact resistance, thereby ensuring design freedom.

  In FIG. 1, the operation panel 5 extends obliquely upward at an angle of, for example, about 10 degrees to the joint surface with the back cover 3 at the opening below the handle 4, and resin is sequentially applied from the left to the top. A large dial-type power switch 6 made of plastic, an oxygen outlet 7 for resin parts, an oxygen flow setting button 8 with a resin cover, and an oxygen flow rate display unit 9 for performing LED or liquid crystal display with 7-segment numbers. Has been. Above the oxygen outlet 7, a resin coupler 13 is shown that is engaged with a stepped portion formed in the oxygen outlet 7 in an airtight manner and is detachably provided. The coupler 13 is set so that an opening of a tube 15 such as a nasal cannula 14 communicates therewith.

  This operation panel 5 is provided near the height corresponding to the waist where a Japanese standard height (160-170 cm) patient stands and both hands are lowered. The operation of the oxygen concentrator 1 can be performed. For this reason, it is not necessary to sit and look into each other like a conventional oxygen concentrator. In some cases, it can also be used by remote operation to be described later. Therefore, the burden on the patient's abdomen is greatly reduced. Furthermore, even a left-handed person can operate without any sense of incongruity because the dials are arranged in symmetrical positions with the oxygen outlet 7 at the center.

  It should be noted that a hook (not shown) for hooking the tube 15 connected to the nasal cannula 14 or the like is provided and substantially corresponds to a range in which the tube 15 connected to the nasal cannula 14 or the like moves in the same room where the patient lives. The tube 15 may be used by removing it from the hook as a full length, and when the tube 15 is not used, the tube 15 with the nasal cannula 14 or the like connected thereto may be hooked on the hook after being wound several times.

  Further, the bottom lid 41 shown by a two-dot chain line in the drawing is also made of an impact-resistant thermoplastic resin, for example, ABS resin for weight reduction. Four rubber feet 22 are fixed to the bottom lid 41 at the four corners to prevent skidding when installed on the floor surface. On the other hand, the carrier 10 used during movement such as going out is fixed to the bottom lid 41 with two fixing screws 12. The carrier 10 has holes 10b larger than the rubber feet 22 at the corresponding positions, and is provided with resin-made free casters 11 at the four corners as shown. Further, the base of the carrier 10 is made of a light metal reinforced aluminum plate for weight reduction, and all the edges of the four sides are bent to ensure strength. In addition, an external battery, which will be described later, is inserted from the back side, and is accommodated in a predetermined position so as to be immovable, and the two fixing screws 12 are passed through and fixed to the female screw portion of the bottom lid 41. Thus, holes 10a for integrating the carrier 10 with the apparatus 1 are provided.

  Next, a description will be given with reference to FIG. The back cover 3 constitutes a hermetic cover by being fixed to the front cover 2 by a total of a plurality of fixing screws 16. The back cover 3 is also made of an impact-resistant thermoplastic resin, for example, ABS resin, similarly to the front cover 2 described above. A filter replacement lid 17 in which an outside air introduction filter 20 is exchangeably accommodated is attached / detached below the opening portion in which the hand can be inserted below the front / rear half handle 4 integrally formed with the back cover 3. It is provided freely.

  In addition, the cord hooks 21 and 21 are fixed to the carrier 10 with the accommodating portion 10c interposed therebetween, so that the AC adapter cable 19a is wound around the carrier 10 so as not to get in the way. The AC adapter cable 19a is connected to the AC adapter 19, and the AC adapter 19 is connected to an outlet provided in the room via a cord 19b.

  FIG. 3 is an external perspective view of an extension tube set such as the nasal cannula 14. In this figure, a resin-made relay coupler 30 is connected to a tube 15 such as a nasal cannula 14 in order to connect an extension tube 31 via a coupler 13. By connecting the extension tube 31 in this way, it can be extended to a length of about 15 m at the longest. As a result, the movement range of the patient can be increased, and the QOL can be further improved.

  FIG. 4 is a substantial view of the operation panel 5 of the portable oxygen concentrator 1. In the figure, components that have already been described are denoted by the same reference numerals and description thereof is omitted. The power switch 6 is operated between the illustrated OFF position and the ON position rotated clockwise by about 90 degrees. The power switch 6 is provided so that most of the power switch 6 is retracted from the operation surface of the operation panel 5 to the back side (the back side of the drawing). Safety measures are taken so as not to injure people even if they collide. At a position corresponding to the ON position of the power switch 6, for example, an operation state lamp 128 a incorporating a light emitting LED that is lit in green and red is provided. A battery remaining amount monitor 128d is provided on the operation state lamp 128a.

  The central oxygen outlet 7 is also provided so that all the enclosed portions are retracted from the operation surface of the operation panel 5 to the back side (the back side in the drawing) as shown in the figure. On the oxygen outlet 7, an alarm display unit 128 c is provided which has a character “inspection” or a character display corresponding thereto printed horizontally. Below the alarm display portion 128c, an oxygen lamp 128b having a built-in light emitting LED, for example, that lights in green, red, and yellow is provided.

  The oxygen flow rate setting button 8 is provided as flat switches 8 a and 8 b on which up and down arrows are printed, and is provided so as to be substantially the same as the operation surface of the operation panel 5. Each time the oxygen flow setting button 8 is operated, the oxygen flow rate is changed every time the oxygen concentrated to about 90% or more is pressed in a 0.25L step or a 0.01L step from 0.25L (liter) per minute to a maximum of 5L. It can be set, and is displayed on the upper oxygen flow rate display unit 9. As described above, the oxygen generation capacity can be changed. The synchronization lamp 25a is provided to notify the patient by lighting or flashing that the concentrated oxygen is being operated in an intermittent supply state by breathing synchronization. The operation indicator 25b is provided to inform the patient by blinking in synchronization with respiration.

  As described above, each operation unit arranged on the operation panel 5 performs a minimum necessary operation on the premise of safety in use and use by the elderly.

FIG. 5A is an operation explanatory diagram of the alarm display unit 128c of the operation panel 5 in FIG. 4, and FIG. 5B is an operation explanatory diagram of the oxygen concentration lamp 128b.
In FIG. 5A, the alarm display unit 128c is printed with the letters “check”, and the built-in lamp is lit to notify when the oxygen concentration is lowered. Also, when an abnormality occurs on the device side, a buzzer sounds and is notified with a voice guide. In addition, when the device stops due to a power failure, while blinking and informing, the buzzer and the voice guide can be surely notified particularly to the visually impaired. In FIG. 5C, in the oxygen lamp 128b, the built-in LED is lit in green when oxygen is normally inhaled. Further, the light is turned off when oxygen is not emitted or when the oxygen concentration is lowered. Then, in the synchronization mode (respiration synchronization mode), when a respiratory state cannot be detected for a certain time, for example, about 30 seconds, the alarm color is red, and a buzzer is sounded and a voice guide is used. In addition, when driving in a synchronized mode in which concentrated oxygen is supplied in synchronization with inspiration, the indicator lights up or blinks in green substantially in synchronization with the breathing pattern (oxygen output) in order to make the patient visually recognize that fact. I will let you know. By doing so, the patient can confirm that the concentrated oxygen is normally supplied.

  On the other hand, in FIG. 3, when the power switch 6 is turned on, a buzzer sounds and all the lamps light up in green for 2 seconds together with a voice guide (initial self-check). And when using it in battery drive mode, it is lit and displayed according to the remaining amount in the display part of five steps after that. The patient operates the increase / decrease switches 8a and 8b of the oxygen flow rate setting button 8 according to the doctor's prescription and starts to supply oxygen when the flow rate is set to a predetermined flow rate (the oxygen flow rate increases and decreases when the increase / decrease switch 8a is pressed). Pressing the switch 8b decreases the oxygen flow rate). When the oxygen concentrator 1 is normally stopped, the previous operating conditions (oxygen flow rate, presence / absence of the tuning mode) are stored in the temporary storage device 206 (see FIG. 7). For this reason, if the oxygen flow rate setting button 8 is not pressed after the initial self-check, the concentrated oxygen is automatically supplied under the previous operating conditions. Note that the fact (the same operating conditions as the previous time) may be notified by voice guidance.

  At the time of stop, when the power switch 6 is turned off, the oxygen lamp 128b is turned off, and the operation lamp 128a flashes for a while and then automatically ends. As an operation performed by the patient every day, there is a case where dust, dust, or the like attached to the outside air introduction filter 20 (see FIG. 2) provided on the back cover 3 is removed with a vacuum cleaner. In order to simplify this operation, the outside air introduction filter 20 is configured to be easily detachable.

  FIG. 6A is an external perspective view showing a state in which the outside air introduction filter 20 is detachable from the back cover 3 of the oxygen concentrator 1, and FIG. FIG. 6C is an external perspective view showing a state where the cover 17 is removed, and FIG. 6C is a cross-sectional view taken along line XX in FIG. First, in FIG. 6A, the back cover 3 is provided with an opening 3k having a vertical opening 3K1 for introducing outside air, and a replacement lid 17 is shown in the opening 3k. So as to be detachable. The opening 3k has a volume for burying the entire replacement lid 17, and forms a concave portion 3c into which the fingertip can be inserted.

  Next, in FIG. 6B, the replacement lid 17 is provided with a lateral opening 17b and upright portions 17a at the four corners as shown in the figure, and an open cell is formed in a portion surrounded by the upright portions 17a. The external air introduction filter 20 made of sponge is housed in an immobile state by its own elastic force. This standing portion 17a also serves as a mounting wall portion to the opening 3k. For this reason, the outside air introduction filter 20 is taken out in the state shown in the figure, washed with water, or replaced with a new one, so that it can be returned to its original state by being set on the replacement lid 17.

  6C, when the replacement lid 17 is set in the opening 3k as shown, the end face 32a of the shielding plate 32 of the main body covers most of the vertical opening 3K1 for introducing outside air. A slight upper part is left. As a result, the outside air is introduced into the inside in the direction of arrow F. Thus, by covering the back surface cover 3 from the inside with the shielding plate 32, noise is effectively prevented from leaking to the outside. That is, the opening to the outside of the oxygen concentrator 1 is only the opening 3K1 and the exhaust ports 3a and 3b, and the opening area is the minimum necessary to secure the flow rate of raw material air described later. Therefore, it is possible to realize a noise level of 38 decibels or less during operation by preventing the sound generated from the inside from leaking to the outside as much as possible. In addition, the hermetic cover structure completely covers the periphery and reduces the number of exit portions, thereby enabling waterproofing measures in addition to soundproofing.

  The shielding plate 32 is prepared as a molded part of black resin, and the speaker 23 and the external communication connector 133 are fixed as shown. In addition, since the oxygen concentrator 1 is usually installed through a narrow gap from the wall surface of the room, the outside air introduction and the exhaust are performed from the back cover 3 side, so that the outside air introduction and the exhaust from the place where the exhaust sound becomes the lowest can be obtained. It is possible. On the other hand, the concave portion 3c of the back cover 3 allows the replacement lid 17 to be taken out so that the fingertip can enter as shown in the figure. The above are the components used directly by the patient.

<Description of piping and block diagram of oxygen concentrator 1>
Next, a specific internal configuration of the oxygen concentrator 1 will be described with reference to FIGS. FIG. 7 is a piping diagram that also serves as a block diagram of the oxygen concentrator 1. In the figure, the same reference numerals are given to the components already described, and the description is omitted, and the double line in the figure is a flow path of air, oxygen, and nitrogen gas, and is generally indicated by pipes 24a to 24g. Has been. A thin solid line indicates power supply or electric signal wiring.

  Here, in the following description, a case will be described in which a compressor 105 in which a compressed air generation unit 105a (compression unit) and a negative pressure air generation unit 105b (decompression unit) are integrated is used. However, the present invention is not limited to this configuration, and it goes without saying that the compressed air generating unit and the negative pressure generating unit may be configured separately. Further, the front cover 2 and the back cover 3 that introduce outside air into the inside through the air inlet and exhaust them to the outside through the air outlet are indicated by broken lines in the figure as sealed containers.

  In FIG. 7, when sequentially described along the flow of the introduced air, the air passes through the outside air introduction filter 20 built in the filter replacement lid 17 (see FIG. 6C), and the air enters the oxygen concentrator 1. (Outside air) is introduced in the direction of arrow F. This air enters the two-stage soundproof chamber 34 by the air blown by the pair of blower fans 104 and 104. That is, as will be described later, an opening formed in a side surface of a two-stage type soundproof chamber 34 (see broken lines) in which the blower fans 104 and 104 are disposed on the upper member and the compressor 105 is disposed on the lower member in a vibration-proof state. The air enters the two-stage soundproof chamber 34 through the. In order to supply a part of this air as raw material air to the compressed air generation unit 105a of the compressor 105, an opening of the pipe 24a is provided in the two-stage soundproof chamber 34, and the pipe 24a An intake filter 101 that performs secondary filtration and a large-capacity intake buffer tank 102 are provided along the way.

  With this configuration, the intake noise of the raw material air is reduced so that the intake noise of the raw material air remains in the two-stage soundproof chamber 34. On the other hand, the two-stage soundproof chamber 34 is made of a reinforced light alloy, aluminum alloy, titanium alloy plate or other suitable material having a thickness of about 0.5 mm to 2.0 mm for weight reduction. Thus, when comprised from a thin plate, the intensity | strength of a screw hole part is not ensured. Therefore, the insert nut is fixed in place as a screw hole. Inside the two-stage soundproof chamber 34, a compressor 105, which preferably includes a compressed air generator 105a that compresses raw material air to generate compressed air, and a negative pressure air generator 105b, is fixed in a vibration-proof state. Has been.

  Next, the filtered raw material air is pressurized by the compression means 105a of the compressor 105 to become compressed air. At this time, the temperature rises and is sent to the pipe 24c, so that the pipe 24c is lightweight with excellent heat dissipation effect. The metal pipe (for example, an aluminum pipe having an outer diameter of 6 mm and an inner diameter of 4 mm) is preferably cooled by blowing air from the blowing fan 104. Thus, by cooling the compressed air, zeolite, which is an adsorbent whose function is lowered at high temperatures, can sufficiently concentrate oxygen to about 90% or more as an adsorbent for generating oxygen by adsorption of nitrogen.

  The compressed air is alternately supplied to the adsorbing means (the first adsorbing cylinder 108a and the second adsorbing cylinder 108b arranged in parallel in this embodiment) via the pipe 24c. For this reason, switching valves (three-way switching valves) 109a and 109b are connected as shown. These switching valves 109a and 109b, and further communicate with the negative pressure air generation unit 105b to desorb unnecessary gas from the first adsorption cylinder body 108a and the second adsorption cylinder body 108b (to perform purging). A plurality of (at least two) negative pressure breaking first valves 120 and negative pressure breaking second valves (pressure regulating valves) 121 are arranged in series in the pipe 24f. As will be described later by opening these, pressure in the pipe 24f is controlled to near atmospheric pressure during the pressure equalization process, and at a predetermined flow rate or less, thereby suppressing compressor vibration and lowering electric charge.

The zeolite that is the catalyst adsorbent stored in the first adsorption cylinder 108a and the second adsorption cylinder 108b is an X-type zeolite having a SiO ₂ / Al ₂ O ₃ ratio of 2.0 to 3.0. In addition, the adsorption amount of nitrogen per unit weight is increased by using at least 88% or more of the tetrahedral unit of Al ₂ O ₃ combined with a lithium cation. In particular, those having a granule measurement value of less than 1 mm and at least 88% or more of tetrahedral units fused with lithium cations are preferred.

  By using such a zeolite, it becomes possible to reduce the amount of raw material air used to generate the same oxygen, and as a result, the compressor 105 for generating compressed air can be made a small type. It was possible to further reduce noise. On the other hand, a check valve, an equal pressure valve 107 including a throttle valve and an on-off valve is branched and connected to the outlet side above the first adsorption cylinder 108a and the second adsorption cylinder 108b. Further, a pipe 24d is formed so that the downstream side of the equal pressure valve 107 is joined, and a product tank 111 serving as a container for storing the separated and produced oxygen having a concentration of about 90% or more is piped as shown in the figure. Has been. A pressure sensor 208 for detecting the pressure in each adsorption cylinder is piped as shown.

  On the downstream side of the product tank 111, a pressure regulator 112 that automatically adjusts the oxygen pressure on the outlet side to be constant is provided. A zirconia-type or ultrasonic-type oxygen concentration sensor 114 is connected to the downstream side of the pressure regulator 112, and the oxygen concentration is detected intermittently (every 10 to 30 minutes) or continuously. A proportional opening valve 115 that opens and closes in conjunction with the oxygen flow rate setting button 8 is connected to the downstream side, and an oxygen flow rate sensor 116 is connected to the downstream side. Further, a demand valve 117 is connected downstream of the oxygen flow sensor 116 via a negative pressure circuit board 202 for breathing synchronization control, and is connected to the oxygen outlet 7 of the apparatus 1 via a sterilization filter 119. ing. With the above configuration, it becomes possible to inhale oxygen concentrated to about 90% or more at a maximum flow rate of 5 L / min to the patient via the nasal cannula 14 or the like.

  Referring again to FIG. 7, the central control unit (CPU) 200 which operates by receiving power supply from one of the three power supply systems includes the power switch 6 and the display LED element shown in FIG. As described above, the display actuating unit 204 that is lit and blinking and operates to display the set flow rate and the accumulated time with the 7-segment LED is connected as shown in the figure. The central control unit 200 is connected to the motor control unit 201 that controls the drive of the electric motor M (AC or DC motor) of the compressor 105 and the motor of the blower fan 104 and the speaker 23, respectively. The generated voice control unit 203 is connected. The central control unit 200 includes a ROM that stores a predetermined operation program, and is further connected to an external storage device 210, a volatile memory (eg, EEPROM) 205, a temporary storage device (eg, RAM) 206, and a real-time clock 207. The storage contents can be accessed by connecting to a communication line or the like via the external connector 133. The three-way switching valves 109a and 109b, the equal pressure valve 107, the negative pressure air generator 105b for desorbing unnecessary gas in the first adsorption cylinder 108a and the second adsorption cylinder 108b, and the pipe 24f The first negative pressure destruction valve 120, the negative pressure destruction second valve 121, the oxygen concentration sensor 114, the proportional opening valve 115, the flow sensor 116, the valve for controlling the demand valve 117, and the negative pressure A circuit board (flow rate control unit) 202 is connected to the central control unit 200.

  Synchronizing with the pressure equalization step, the first negative pressure destruction valve 120 is operated to be in an open state, so that outside air enters the flow path, and the flow path is brought closer to the atmospheric pressure. Due to this action, the compressor 105 is in a state close to a no-load state, so that generation of vibration can be prevented, and noise can be reduced and power can be reduced. As will be described later, the second negative pressure release valve 121 is turned on according to the set oxygen flow rate and is opened. On the other hand, the air blowing fans 104 and 104 for cooling the compressor 105 and cooling the inside of the oxygen concentrator 1 consume about 2.7 W of power. An axial fan may be used instead of this blower. Here, the maximum noise pressure level of the apparatus 1 is 35 dBA or less at the maximum rotation speed, and 33 dBA when the concentrated oxygen flow rate is 1 L / min or less. As the three-way switching valves 109a and 109b, electromagnetic valves that perform a valve operation generally called a direct acting type by a magnetic force during energization can be used. This type of solenoid valve has a problem of high power consumption because the main valve is operated only by electric power. Therefore, a pilot-type three-way switching valve can be used as the three-way switching valves 109a and 109b. According to this pilot-type three-way selector valve, since it can be operated by using a little power consumption and the air pressure from the compressor 105, it is reduced from the conventional 8W to 0.5W. Reduction is expected.

  Each of the above-described components is fixed mainly with the two-stage soundproofing chamber 34 as an attachment portion in consideration of improvement in assembly workability and inspection maintenance of the small-sized oxygen concentrator 1 with reduced noise. That is, the compressor 105 that generates noise, the blower fan 104 that generates a blowing sound to cool the compressor 105 by blowing, the air inlet port of the intake buffer tank 102, the three-way switching valves 109a and 109b, the exhaust A silencer 110 that sometimes generates exhaust noise and other various valves are arranged inside a two-stage soundproof room 34 in which a soundproof material is laid on the entire inner peripheral surface, and the outer wall portion of the two-stage soundproof room 34 is effectively used. Then, the shielding plate 32, the adsorption cylinders 108a and 108b, the product tank 111, the intake buffer tank 102, the various control boards 200 and 201, and the oxygen pressure are automatically adjusted to be constant as described above. Pressure regulator 112, oxygen concentration sensor 114 and proportional opening valve 115 downstream of pressure regulator 112, oxygen flow sensor 116, and negative pressure circuit board 20 for breathing synchronization control A demand valve 117 which is connected is fixed to. In this way, the components accompanied by vibration or noise generation are provided in a soundproof state inside the two-stage soundproof chamber 34, so that the supply sound of the compressed air, the introduction sound of the external air, and the filtered air for producing the raw air The noise is reduced in such a way that the introduction sound, the operation sound of the three-way switching valve and the exhaust sound periodically generated from the silencer 110 do not leak to the outside. Further, as described above, the front cover 2 and the back cover 3 are hermetic covers having a minimum necessary opening for introducing the outside air into the inside through the intake port and exhausting the outside air through the exhaust ports 3a and 3b. In the same way, noise reduction is achieved.

  Next, FIG. 8 is a three-dimensional exploded view seen from the back side in order to show the internal configuration of the oxygen concentrator 1. In this figure, components already described are denoted by the same reference numerals and description thereof is omitted. From the lower side, the bottom made of resin indicated by a two-dot chain line in FIG. 1 with the rubber feet 22 fixed to the four corners from below. The lid 41 is fixed to the bottom surface of the resin base body 40 using a plurality of fixing screws 16. The base body 40 is formed in a box shape in which wall surfaces continuously formed downward from the four surfaces are integrally formed. As shown in the drawing, the connectors 131 and 130 are fixed on the back wall surface. Has been. In addition, exhaust ports 40c and 40c that face the exhaust ports 3a and 3b of the back cover 3 and communicate with the internal power supply chamber are formed as shown in the figure, and the final external ports are provided through these exhaust ports 40c. Exhaust is performed. The upper surface of the base body 40 is formed flat as shown in the figure, and holes for fixing with the fixing screws 16 from the left and right sides and the back side of the two-stage soundproof chamber 34 formed as shown in the figure. The upright part 40f which bored the part is integrally formed from three directions. Further, an exhaust opening 40b communicating with the power supply chamber is further formed.

  Next, the two-stage soundproof chamber 34 is formed in a sealed box 35 made of a lightweight metal plate. Two blower fans 104 are fixed on an upper member 36 that can be taken in and out from the front side in FIG. 8, and a compressor 105 is disposed in a vibration-proof state on a lower member 37 that can be taken in and out from the side. . The two-stage soundproof chamber 34 is sealed by fixing a soundproof chamber lid 39 shown on the front side of FIG. 8 and a soundproof chamber lid 38 shown on the back side with a plurality of fixing screws 16. For this reason, the two-stage soundproof chamber 34 is integrally provided with a mounting portion that is bent as shown in the figure and in which an insert nut is implanted. A soundproof material 51 is laid in the soundproof room. As the material of the soundproofing material 51, a nonwoven fabric made of polyolefin fibers having a fiber diameter of 1 to 4 μm and polyolefin short fibers having a fiber diameter of 20 to 30 μm is used. The polyolefin fiber is preferably a polypropylene fiber. Also preferred is a polypropylene fiber that has been embossed. If necessary, a soundproof material 51 may be attached to the outside of the soundproof room. Further, the outer peripheral surface is a vibration damping member, and a sheet-like material made of a mixture of synthetic rubber and special resin material is laid, and the two-stage soundproof chamber 34 itself made of a thin aluminum plate is caused by resonance or the like. Vibration is prevented. First opening portions 35a and 35a (shown by broken lines) shown by solid lines are formed in the left and right side wall surfaces above the upper member 36 of the two-stage soundproof chamber 34 so as to introduce outside air into the interior. It is configured. The upper member 36 is provided with a plurality of fixing holes 36h. The piping 24b is fixed to the fixing holes 36h via rubber bushes, thereby providing a vibration and vibration isolating function.

  In addition, each blower fan 104 is fixed to the upper member 36 using a bracket so that each blower port faces downward. Between the air blowing fans 104, the above-described three-way switching valve 109 and the like are arranged. Cylindrical adsorption cylinders 108a and 108b are arranged side by side with the intake buffer tank 102 on the left side wall surface of the two-stage soundproof chamber 34, and pass through the band 49 to a fixture 49k fixed to the side wall surface. Later, the band 49 is tightened to secure it as shown. At this time, the suction cylinder 108 is placed on the upper surface of the base body 40, but the buffer tank having a long overall length is partially inserted and fixed in the opening 40d.

  The product tank 111 is made of polyethylene resin to be vacuum-formed, and is placed on the upper side in the longitudinal direction as shown in the figure. The shielding plate 32 is also made of resin for weight reduction, and is provided with a speaker 23 and an external connector 133 as shown in the figure, and a fixing screw 16 is used for the outer wall surface above the two-stage soundproof chamber 34. The mounting part that also serves as a reinforcement to be fixed is integrally molded. Further, the heat dissipating members 52 and 53 are fixed to the wall surface above the two-stage soundproof chamber 34 by the fixing screws 16 and the control boards 200 and 201 are fixed in an upright state to enhance the heat dissipating effect. Yes. In addition, since this shielding board 32 comes out outside as mentioned above, it is colored black using a black pigment.

  An oxygen concentration sensor 114, a proportional opening valve 115, a pressure regulator 112, an oxygen flow sensor 116, a demand valve 117, and a negative pressure circuit board 202 are fixed to the right side wall surface of the two-stage soundproof chamber 34. .

  As described above, it is possible to realize downsizing and access from four directions by adopting a structure in which the outer wall of the two-stage type soundproof chamber 34 fixed on the base body 40 is fixed as the mounting surface as described above. As a result, the assembly workability is greatly improved, and an automatic assembly line can be realized. Further, the front cover 2 and the back cover 3 described above can greatly contribute to space saving by preventing the front cover 2 and the back cover 3 from protruding radially from the base body 40.

  FIG. 9 is a three-dimensional exploded view seen from the bottom side to show the bottom lid 41 and the base body 40 of the portable oxygen concentrator 1. In this figure, components that have already been described are denoted by the same reference numerals and description thereof is omitted. As shown in the figure, the base body 40 has a power supply chamber 401 communicating with the upper exhaust opening 40b, and a built-in battery. A battery chamber 402 having a built-in 228, a uniform pressure valve 107, and a storage chamber 403 that stores a part of the intake buffer tank 102 are formed through a partition wall, and each of the chambers is sealed after the bottom lid 41 is fixed. Like to do. With the above configuration, in the process of being exhausted through the silencer 110 (see FIG. 7) built in the two-stage soundproof chamber 34 as described above, the exhaust is branched in the direction indicated by the broken line arrow F and is externally provided from the opening 40c. The exhaust sound is attenuated so that the heat generated by the power supply device 226 can be cooled by the exhaust gas.

  FIG. 10 is an external perspective view seen from the opposite side in order to show the internal configuration of the portable oxygen concentrator 1 after the components shown in FIG. 9 are assembled on the base body 40. In this figure, components that have already been described are denoted by the same reference numerals and description thereof is omitted. All components are fixed on the base body 40 without a gap as illustrated. In order to fix the front and back covers 2 and 3 to the internal structure after the assembly of the portable oxygen concentrator 1, one flange 48 is formed on the outer peripheral surface of the base body 40. A sound absorbing material 51 is laid (attached) on the back surface of the front cover 2. As the material of the soundproofing material 51, a nonwoven fabric made of polyolefin fibers having a fiber diameter of 1 to 4 μm and polyolefin short fibers having a fiber diameter of 20 to 30 μm is used. The polyolefin fiber is preferably a polypropylene fiber. Also preferred is a polypropylene fiber that has been embossed. Further, a mounting board 128 on which the lamps arranged on the operation panel 5 and the display operation unit 204 of the display unit are mounted is fixed as shown in the figure. Further, below the surface cover 2, the other flange portions 50, 50 that sandwich one flange portion 48 formed on the outer peripheral surface of the base body 40 from above and below are integrally formed vertically. Further, the abutting surface 2p of the surface cover 2 is formed so as to be along a substantially flat surface, and a shape portion 2h obtained by insert-molding an insert nut serving as a female screw portion of the fixing screw 16 is formed at a plurality of locations. Further, the abutting surface 3p of the back cover 3 is formed so as to be along a substantially flat surface, and a shape portion 3h serving as an insertion hole for the fixing screw 16 is formed at a plurality of locations.

  FIG. 11 is a sectional view showing how the front and back covers 2 and 3 are fixed. As shown in the figure, when the covers 2 and 3 are brought into contact with the abutting surfaces 2p and 3p in order to fix the front and back covers 2 and 3 to the base body 40, one flange 48 of the base body 40 is brought into contact with the other. It will be in the state which enters between the collar parts 50 and 50. Thereafter, the hermetic cover is completed by fixing with the fixing screw 16. By configuring as described above, space saving can be realized. For this reason, the front cover 2, the back cover 3, the bottom cover 41, and the base 40 are prepared as lightweight parts that are injection-molded using an ABS resin material, and the total weight of the resin parts is 2.6 kg. The total weight of the oxygen concentrator 1 was about 26% of 10 kg. Here, the cover having the same surface area formed from the front cover 2 and the back cover 3 is a conventional wooden casing that is easy to process, is less likely to be distorted in dimensions, is lightweight, and has excellent soundproofing performance. In case of using MDF (Medium Density Fiberboard) wood, the weight is about 4.6 kg. Also, since the wooden casing is a flat plate with a thickness of about 1 cm, in order to make it curved as shown in the figure, these plate members are stacked and processed into a curved shape. End up. For this reason, the target weight of about 10 kg cannot be achieved. However, it goes without saying that a hermetic cover can also be made with the MDF described above, for example, in the case of an indoor permanent type that does not need to be lightweight.

<Description of the two-stage soundproof room 34>
Next, FIG. 12 is an external perspective view in which a main part of the lower member 37 of the two-stage soundproof chamber 34 that houses the compressor 105 in a vibration-proof and soundproof state is cut away. In this figure, components that have already been described are denoted by the same reference numerals and description thereof is omitted. On the inner peripheral surface of the two-stage type soundproof chamber 34, a soundproofing material in which a damping material and a closed cell sponge are formed in a multilayer structure. Is laid. The compressor 105 is a rotary that alternately forms a compressed air generating portion and a negative pressure air generating portion when a linear motion piston linked to an eccentric cylindrical body that rotates about a drive shaft of the electric motor M reciprocates in the cylinder. A cylinder device 300 is provided. The first and second pistons 301 and 302 are assembled in an intersecting manner with the eccentric cylindrical body 303 assembled and connected to the output shaft 331 of the electric motor M. As the eccentric cylindrical body 303 rotates, the first and second pistons 301 and 302 reciprocate in the sealed cylinder, whereby the compressed air generator 105a and the negative pressure air generator 105b are alternately formed. It has become so. For this purpose, a one-way valve (not shown) is mounted on the compression surface of each piston.

  The reciprocating direction of the pair of pistons that intersect with each other is a horizontal direction parallel to the bottom surface of the two-stage soundproof chamber 34. However, when the load increases, vibrations in the directions of arrows V and V are assumed. The For this purpose, the compressor 105 is fixed so that the compressor 105 is sandwiched from above and below by a compressor fixing base 61 that puts the compressor in a substantially vertical vibration-proof state in the two-stage soundproof chamber 34 so that vibration can be efficiently absorbed. Yes. That is, two front and rear coil springs 62 (only the front side is shown) are fixed, and a rubber bush (not shown) is further built in and fixed on the lower member 37 as shown. The compressor fixing base 61 is preferably made of an aluminum plate for weight reduction.

  When the compressor 105 is started with the above configuration, the coil spring 62 repeatedly performs compression and expansion appropriately, while the pipe 24 fixed to the upper member 36 via the rubber bush as described above is also compressed appropriately. By repeatedly performing the stretching, the vibration can be supported substantially in a six-point support state. Further, since the compressor fixing base 61 holds only the electric motor M portion, the air blowing for cooling the compressor 105 by the air blowing fan 104 can be smoothly performed without being obstructed. It should be noted that the soundproofing material 51a can be provided in the soundproofing chamber 34 of the two-stage soundproofing chamber 34, particularly in the soundproofing chamber that houses the compressor, to provide a soundproofing effect. In this case, as the material for the soundproofing material, a nonwoven fabric composed of polyolefin fibers having a fiber diameter of 1 to 4 μm and polyolefin short fibers having a fiber diameter of 20 to 30 μm is used. The polyolefin fiber is preferably a polypropylene fiber. Also preferred is a polypropylene fiber that has been embossed.

  Next, a rotary cylinder device used in the compressor will be described with reference to FIGS. In the rotary cylinder device, the rotary motion of the shaft (drive shaft) 304 is converted into the reciprocating motion of the first and second pistons 301 and 302 and output.

In FIG. 13, a shaft 304 (drive shaft) is rotatably supported on a main body case 307 constituted by a first main body case 305 and a second main body case 306. The shaft 304 is assembled to be linked to the output shaft 507 of the electric motor M.
The first main body case 305 and the second main body case 306 are assembled together by screwing four corners with bolts 307a. In the main body case 307, as shown in FIG. 15, an eccentric cylindrical body 303 that can rotate around the first crankshaft 308, and a first piston 301 and a second piston assembled to the eccentric cylindrical body 303. 302 (hereinafter referred to as “piston complex P”; see FIG. 14) is rotatably accommodated. This will be specifically described below.

  In FIG. 15, the first crankshaft 308 is connected eccentrically to the axis of the shaft 304. In the present embodiment, the shaft 304 is formed integrally with the balance weight 309. A shaft may also be formed on the balance weight 310 side. The balance weights 309 and 310 are fitted into both shaft ends of the first crankshaft 308, respectively. In FIG. 19, slits 308 a are formed in the axial direction at both shaft ends of the first crankshaft 308. Each slit 308 a is provided with a pin hole 308 b in a direction orthogonal to the first crankshaft 308. The diameter of the pin hole 308b is larger than the width of the slit 308a, and the slit 308a and the pin hole 308b are formed to intersect (orthogonal). In addition, pin holes 309b and 310b (see FIGS. 20A and 21A) of the balance weights 309 and 310 and the pin holes 308b are fitted to the outer peripheral portions of both ends of the first crankshaft 308 in alignment. Thus, a D-cut portion 308c is formed.

  20 and 21, bolt holes 309 a and 310 a and pin holes 309 b and 310 b are provided in the shaft portions of the balance weights 309 and 310, respectively. The balance weights 309 and 310 are fitted into the first crankshaft 308 so that the pin holes 309b and 310b and the pinhole 308b (see FIG. 19) of the first crankshaft 308 communicate with each other, and the pin 311a communicates. The pin holes 309b and 308b are fitted into the pin holes 310b and 308b communicating with the pin 311b, respectively (see FIG. 16). The bolts 312a and 312b are fitted into the bolt holes 309a and 310a, respectively, and the widths of the slits 308a and the pin holes 308b are reduced, so that the pins 311a and 311b are prevented from coming off, and the balance weights 309 and 310 are moved to the first crankshaft 308. Are integrally assembled at both ends (see FIG. 16).

  In FIG. 15, the shaft 304 integrally formed with the balance weight 309 is rotatably supported by the first bearing portion 313a, and the shaft portion 310c formed on the balance weight 310 is rotatable by the second bearing portion 313b. It is pivotally supported. The balance weights 309 and 310 have, for example, a fan shape (see FIGS. 20B and 20C and FIGS. 21B and 21C), are assembled around the shaft 304, and the first crank is described later. It is provided to balance the mass of the rotational movement around the shaft 304 including the shaft 308 and the piston complex P.

  Further, as shown in FIG. 22B, the eccentric cylinder 303 has a plurality of second virtual crankshafts 314a and 314b that are eccentric with respect to the axis of the first crankshaft 308. In this embodiment, since there are two intersecting pistons, the second virtual crankshafts 314a and 314b are formed at positions that are 180 degrees out of phase about the first crankshaft 308.

  As shown in FIG. 15, the first and second pistons 301 and 302 intersect with each other and are assembled to an eccentric cylindrical body 303 that rotates about the first crankshaft 308. Specifically, in FIG. 22B, the eccentric cylindrical body 303 includes a first cylindrical body 303a through which the first crankshaft 308 serving as the rotation center is inserted, and a second cylindrical body that is continuous with the first cylindrical body 303a. The cylindrical body 303b is formed continuously on both sides in the axial direction. A first crankshaft 308 is fitted concentrically into the first cylinder 303 a and serves as the center of rotation of the eccentric cylinder 303. In addition, the axis of the second cylinder 6 b coincides with the second virtual crankshafts 314 a and 314 b that are eccentric with respect to the axis of the first crankshaft 5. As shown in FIG. 15, the first and second pistons 301 and 302 are fitted into the second cylinder 303b so as to be rotatable via the outer bearing portions 316a and 316b at the intersections.

  22A and 22B, bearing holding portions 303c and 303d are formed on the inner and outer peripheral portions of the second cylinder 303b, respectively. As shown in FIG. 15, the inner bearing portions 315a and 315b are held by the bearing holding portion 303c, and the outer bearing portions 316a and 316b are held by the bearing holding portion 303d. The inner bearing portions 315a and 315b support the first crankshaft 308 in a rotatable manner. Further, the outer bearing portions 316a and 316b support the first and second pistons 301 and 302 so as to be rotatable while being fitted so as to intersect the second cylindrical portion 303b.

  As described above, the first and second pistons 301 and 302 are assembled so that the pistons intersect with each other and intersect with the second cylinder 303b of the eccentric cylinder 303, so that they reciprocate on the same plane. It is assembled as possible. Therefore, the piston complex P (see FIG. 14) can be compactly assembled in the height direction and the radial direction, and space-saving can be achieved in a small size and a light weight.

  In addition, ring-shaped seal cups 317a and 317b (FIG. 27) are provided on the first piston head portion 301c and the second piston head portion 302c provided at both longitudinal ends of the first and second pistons 301 and 302 shown in FIG. (See FIGS. 28A and 28B), seal cup pressing members 318a and 318b (see FIGS. 28A and 28B) are assembled by bolts 319, respectively. For the seal cups 317a and 317b, an oil-free seal material (for example, PEEK (polyether ether ketone) resin material or the like) is used. Standing portions 317c are erected on the outer peripheral edge portions of the seal cups 317a and 317b in the piston sliding direction (see FIGS. 27A and 27B). In a compressor, a fluid rotary machine, or the like, the upright portion 17c is assembled toward the outside in the sliding direction of the first and second piston head portions 7c, 8c.

  14 and 15, a cylinder 321 is assembled with a bolt 322 in an opening 320 provided on a side surface (four surfaces) of the main body case 307 (the first main body case 305 and the second main body case 306). ing. In FIG. 14, the first and second pistons 301 and 302 slide by seal cups 317a and 317b while maintaining the sealing performance with the inner wall surface of the cylinder 321.

25A to 25E are a plan view, a Y-axis direction sectional view, a front view, a right side view, and a bottom view of the first and second pistons 301 and 302, respectively. Since the first and second pistons 301 and 302 have the same shape, the first piston 301 will be described below. Although the configuration existing in the first piston 301 is not shown, it is also assumed to exist in the second piston 308.
A clearance hole 301 a that prevents interference with the shaft 304 is provided at the center of the first piston 301. The center of the escape hole 301a corresponds to the second virtual crankshaft 314a. A bearing holding portion 301b that holds the outer bearing portion 316a is provided at the peripheral edge of the escape hole 301a (see FIGS. 25B and 25C).

  In addition, disk-shaped first piston head portions 301 c are respectively provided at both longitudinal ends of the first piston 301. The first piston head portion 301c is provided with a pedestal 301d having a bolt hole 301e (see FIG. 25D). As shown in FIG. 16, a pedestal 301d is provided on both end faces of the first piston head portion 301c, and a seal cup 317a is superimposed on a stepped portion 301f formed on the outer peripheral side, and a seal cup holding member 318a is placed on the seal cup 317a. The bolt hole 318c is aligned with the bolt hole 301e and overlapped. Then, by fitting the bolt 319 into the bolt hole 318c and the bolt hole 301e, the seal cup 317a is sandwiched between the seal cup pressing member 318a and the first piston head portion 301c and assembled together. Similarly, for the second piston head portion 302c of the second piston 302, the seal cup 317b is sandwiched between the seal cup pressing member 318b and the second piston head portion 302c and assembled together.

  As shown in FIGS. 26A and 26B, the cylinder 321 has a flange 321b formed around the opening 321a, and a cylindrical cylinder body 321c is formed from the flange 321b. The first piston head portion 301c and the second piston head portion 302c of the first piston 301 and the second piston 302 are assembled so as to slide along the inner wall surfaces of the cylinder body portion 321c and the flange portion 321b (FIG. 13, (See FIG. 14).

  Bolt holes 321d are provided at two locations on the flange portion 321b. The cylinder body 321c is inserted into the opening 320 (see FIG. 15) of the main body case 307, and the flange 321b is overlapped with the side surface. At this time, the bolt hole 321d is aligned with the bolt hole 305d of the first body case 305 and the bolt hole 302d of the second body case 302, and the bolt 322 is fitted with the bolt hole 321d and the bolt hole 305d or the bolt hole 302d. As a result, they are assembled together (see FIG. 16).

  In FIGS. 26A and 26B, the flange portion 321b is provided with bolt holes 321e at a plurality of locations. This is because, as will be described later, when the cylinder head is assembled on the cylinder 321, a bolt hole for bolt fitting is required.

  23A and 23B, the first opening 320a is provided in each of the side surfaces (four surfaces) of the first main body case 305 on the housing. A bearing holding portion 305 a is provided on the axial end surface portion of the first main body case 305. The first bearing portion 313a is fitted into the bearing holding portion 305a (see FIG. 15). An opening 305b is formed at the center of the bearing holding portion 305a. The shaft 304 integrally formed with the balance weight 309 is inserted through the first bearing portion 313a held by the bearing holding portion 305a and extended from the opening 305b to the outside of the main body case 307 (see FIG. 15). Further, bolt holes 305c into which bolts 307a are respectively fitted are provided at the four corners of the first main body case 305. Further, a bolt hole 305d of a bolt 322 (see FIG. 13) for fixing the cylinder 321 is provided on a side surface portion (four surfaces) of the first main body case 305.

  24 (a) and 24 (b), a second opening 320b is provided in the side surface (four surfaces) of the second main body case 306, and a bearing in the axial end surface of the second main body case 306 is provided. A holding unit 306a is provided. The second bearing portion 313b is fitted into the bearing holding portion 306a (see FIG. 15). An opening 306b is formed in the bearing holding portion 306a. The shaft portion 310c integrally formed with the balance weight 310 is fitted into the second bearing portion 313b held by the bearing holding portion 306a (see FIG. 15). In addition, bolt holes 306 c into which bolts 307 a are fitted are provided at the four corners of the second main body case 306 in alignment with the bolt holes 305 c of the first main body case 305. Further, a bolt hole 306d of a bolt 322 (see FIG. 13) for assembling the cylinder 321 is provided on a side surface portion (four surfaces) of the second main body case 306.

FIG. 16 shows an example of the assembly configuration of the rotary cylinder device.
The inner bearing portions 315a and 315b are assembled to the bearing holding portion 303c (see FIGS. 22A and 22B) of the eccentric cylindrical body 303. Further, the first crankshaft 308 is fitted into the center holes of the inner bearing portions 315a and 315b of the eccentric cylindrical body 303 and the first cylindrical body 303a (see FIGS. 22A and 22B) (see FIG. 15). Further, the seal cups 317 a and 317 b and the seal cup pressing members 318 a and 318 b are integrally assembled to the first and second piston head portions 301 c and 302 c of the first and second pistons 301 and 302 with a bolt 319. Further, the first and second pistons 301 and 302 are assembled so that the outer bearing portions 316a and 316b are fitted into the bearing holding portions 301b (see FIG. 25C) and the bearing holding portions 302b (not shown) of the first and second pistons 301 and 302. Then, the first and second pistons 301 and 302 are fitted into the second cylindrical portion 303b so as to intersect with each other via the outer bearing portions 316a and 316b.

  Further, the balance weights 309 and 310 are fitted into both ends of the first crankshaft 308, the pins 311a and 311b are fitted into the pin holes 308b, and the bolts 312a and 312b are tightened to attach the balance weights 309 and 310 to the first crankshaft 308. Assemble to one. Further, the first bearing portion 313 a is fitted into the bearing holding portion 305 a of the first main body case 305, and the second bearing portion 313 b is fitted into the bearing holding portion 302 a of the second main body case 302. Then, the first main body case 305 and the second main body case 306 are combined so that the shaft 304 is fitted into the first bearing portion 313a and the shaft portion 310c of the balance weight 310 is fitted into the second bearing portion 313b. Thus, the eccentric cylindrical body 303 and the first and second pistons 301 and 302 (piston ton complex P; see FIG. 14) assembled so as to intersect with the eccentric cylindrical body 303 are accommodated in the main body case 307 (see FIG. 13). . The main body case 307 (see FIG. 13) is assembled by fitting the bolt 307a in a state where the bolt hole 305c and the bolt hole 302c are aligned and overlapped. Finally, the cylinder 321 is fitted into an opening 320 (see FIGS. 14 and 15) formed on the side surface (four surfaces) of the main body case 307, and the first piston head portion 301c and the second piston head portion 302c are connected to the cylinder. The rotary cylinder device is assembled by being slidably fitted in the openings 321a (see FIGS. 26 (a) and (b)) 321 (see FIG. 14).

The rotary cylinder device assembled as described above has a rotational balance (first balance) around the outer bearing portions 316a and 316b (second virtual crankshafts 314a and 314b) of the first and second pistons 301 and 302, The rotation balance (second balance) around the first crankshaft 308 of the piston complex P and the rotation balance (third balance) of the components around the shaft 304 are adjusted and assembled by balance weights 309 and 310. Yes.
Thereby, even if the piston complex P including the first crankshaft 308 and the eccentric cylindrical body 303 and the first and second pistons 301 and 302 is rotated about the first crankshaft 308 around the shaft 304, the rotation is performed. Vibration can be suppressed and noise reduction can be achieved, and loss due to vibration of a plurality of pistons can be reduced to increase energy conversion efficiency.

  Here, the relationship between the rotational motion of the first crankshaft 308 and the second virtual crankshafts 314a and 314b around the shaft 304 and the reciprocating motion of the plurality of pistons is shown in FIGS. 17A to 17L. This will be described with reference to the drawings. 17A to 17L, the center O of the rolling circle 323 coincides with the axis of the shaft 304. Further, it is assumed that the first crankshaft 308 exists at a position eccentric from the center O, and the second virtual crankshafts 314a and 314b rotate without slipping as the first crankshaft 308 rotates. The number of second virtual crankshafts 14a, 14b corresponds to the number of pistons.

  A center distance r between the shaft 304 (center O) and the first crankshaft 308 is defined as the arm length (rotation radius) of the first virtual crankarm and the second virtual crankarm. Further, the first crankshaft 308 rotates on the rotation track 330 around the axis (center O) of the shaft 304 with the arm length r of the first virtual crank arm as the rotation radius. Further, the second virtual crankshafts 314a and 314b rotate without apparently slipping on a rotation path (virtual circle 324) having an arm length r of the second virtual crankarm centered on the first crankshaft 308 as a rotation radius. To do. Thus, the first and second pistons 301 and 302 reciprocate around the center O along the radial direction (inner cycloid) of the rolling circle 323 having the radius R (2r) of the virtual circle 324 as the radius. It has become.

  In the present embodiment, the second virtual crankshafts of the second cylinder 303b in which the first and second pistons 301 and 302 that are orthogonal to each other are connected are exemplified as 314a and 314b. In FIG. 17A, the second virtual crankshaft 314a is at the intersection (lower end position) of the rolling circle 323 and the diameter R1, and the second virtual crankshaft 314b is the center O of the rolling circle 323 (the axial center position of the shaft 4). )It is in. The first crankshaft 308 is assumed to be located at a radius r from the center O of the rolling circle 323.

  A case where the first crankshaft 308 rotates once counterclockwise around the center O of the rolling circle 323 will be described. It is assumed that the virtual circle 324 rotates in the clockwise direction without rotating along the inner circumference of the circle 323. FIGS. 17A to 17L show a state where the first crankshaft 308 is displaced by 30 degrees.

  When the first crankshaft 308 is rotated 90 degrees counterclockwise from the position shown in FIG. 17A, the position becomes the position shown in FIG. At this time, the second virtual crankshaft 314a moves to the center O on the diameter R1 of the rolling circle 323, and the second virtual crankshaft 314b reaches the intersection (right end position) between the diameter R2 orthogonal to the diameter R1 and the rolling circle 323. Moving.

  When the first crankshaft 308 is further rotated 90 degrees counterclockwise from the position shown in FIG. 17D, the position shown in FIG. At this time, the second virtual crankshaft 314a moves to the intersection (upper end position) between the rolling circle 323 and the diameter R1, and the second virtual crankshaft 314b moves to the center O of the rolling circle 323.

  When the first crankshaft 308 is further rotated 90 degrees counterclockwise from the position shown in FIG. 17G, the position shown in FIG. At this time, the second virtual crankshaft 314a moves to the center O of the rolling circle 323, and the second virtual crankshaft 314b moves to the intersection (left end position) between the rolling circle 323 and the diameter R2.

  When the first crankshaft 308 is further rotated 90 degrees counterclockwise from the position of FIG. 17 (j), the position of FIG. 17 (a) is obtained. At this time, the second virtual crankshaft 314a moves to the intersection (lower end position) between the rolling circle 323 and the diameter R1, and the second virtual crankshaft 314b moves to the center O of the rolling circle 323.

  As described above, when the first crankshaft 308 rotates around the center O (shaft 304), the second virtual crankshaft 314a moves on the diameter R1 of the rolling circle 323 that is the rolling locus (inner cycloid) of the virtual circle 324. The second virtual crankshaft 314b reciprocates on the diameter R2 of the rolling circle 323.

  That is, with the rotational movement of the first crankshaft 308 and the piston complex P (see FIG. 14) along the rotation path 330 having the radius r about the axis (center O) of the shaft 304, the second virtual crankshaft In the second cylindrical portion 303b having 314a and 314b as the axis, the first piston 301 linked to the eccentric cylindrical body 303 is on a diameter R1 of a rolling circle 323 having a radius 2r (a concentric circle centered on the axis of the shaft 304). The reciprocating motion is repeated, and the second piston 302 repeats the reciprocating motion on the diameter R2 of the rolling circle 323 having a radius of 2r (a concentric circle with the axis of the shaft 304 as the center).

  As shown in FIGS. 18A to 18C, first and second cylinder heads 325 and 326 are inserted into bolt holes 321e (see FIG. 26 (FIG. 26)) in a cylinder 321 that houses the first and second piston head portions 301c and 302c. a) and (b)), the cylinder chambers 327a, 327b, 327c, and 327d are formed by being opposed to the first and second piston head portions 301c and 302c, and each of the cylinder chambers 327a to 327d is formed. A fluid suction port 328 and a communication port 329 are formed.

  Therefore, when the shaft 304 is rotationally driven by the electric motor M, the first crankshaft 308 is rotated about the shaft 304, the eccentric cylinder 303 is rotated about the first crankshaft 308, and the first piston 301 and the first piston 301 are rotated. The two pistons 302 reciprocate in a concentric radial direction around the shaft 304. At this time, in each of the cylinder chambers 327a, 327b, 327c, and 327d, an operation is performed in which air is sucked from the suction port 328 and compressed air is sent from the feed port 329.

29 to 32 illustrate the relationship between the rotational position of the shaft 304 and the reciprocating positions of the first and second piston head portions 301c and 302c.
29 shows the origin position, FIG. 30 shows the position rotated 90 degrees from the origin position, FIG. 31 shows the position rotated 180 degrees from the origin position, and FIG. 32 shows the position rotated 270 degrees from the origin position. 29 to 30, the first piston 301 moves upward in a plan view, and the second piston 302 moves rightward in a plan view. In the cylinder chambers 327a and 327c (negative pressure air generation unit 105b), fluid is sucked, and in the cylinder chambers 327b and 327d (compressed air generation unit 105a), fluid is sent out. 30 to 31, since the first piston 301 is moving upward in a plan view and the second piston 302 is starting to move leftward in a plan view, the cylinder chambers 327b and 327c (compressed air generators) In 105a), the fluid is sent out, and in the cylinder chambers 327a and 327d (negative pressure air generating portion 105b), the fluid is sucked. 31 to 32, since the first piston 301 starts to move downward in a plan view and the second piston 302 moves to the left in a plan view, the cylinder chambers 327a and 327c (compressed air generator 105a ) And the cylinder chambers 327b and 327d (negative pressure air generation unit 105b) suck in the fluid.

  The shapes of the first piston head portion 301c and the second piston head portion 302c do not have to be perfect circles, and may be square, for example.

  Moreover, although the rotary cylinder apparatus provided with 2 piston was demonstrated, you may provide 3 or more pistons. For example, when three pistons are provided, the virtual circle 324 in FIG. 17A may be assembled so that the second virtual crankshaft is arranged with a phase difference of 120 degrees around the first crankshaft 308 as a rotation center. Is possible.

Further, in the present embodiment, the first and second pistons 301 and 308 are assembled to the eccentric cylinder 303 so as to be able to reciprocate on the same plane (XY plane). Although it is necessary to divide into a plurality, it is also possible to arrange a plurality of pistons so as to intersect at different positions in the height direction (Z-axis direction).
In addition, the first and second pistons 301 and 302 are arranged so as to be orthogonal to each other. However, the present invention is not limited to this, and the first crankshaft 308 can be arranged at a phase difference of, for example, 60 degrees. It is.

As described above, when the shaft 304 is driven to rotate, the first crankshaft 308 rotates and the eccentric cylinder 303 rotates around the first crankshaft 308, whereby the rotation defined by the second virtual crank arm. The first virtual crankshafts 314a and 314b rotate on the orbit (inner cycloid) without seemingly slipping, and the first and the second virtual crankshafts 314a and 314b are assembled to intersect the eccentric cylindrical body 303 around the second virtual crankshafts 314a and 314b. The second pistons 301 and 302 reciprocate in a concentric radial direction around the shaft 304.
Therefore, since the compressor components are assembled around the shaft 304 so as to be capable of rotating at a constant speed, the loss can be reduced and the energy conversion efficiency can be increased to reduce the power consumption.

  Further, the rotational balance (first balance) around the outer bearing portions 316a and 316b (second virtual crankshafts 314a and 314b) of the first and second pistons 301 and 302, and the first crankshaft 308 around the piston complex P The rotation balance (second balance) and the rotation balance (third balance) of the components around the shaft 304 are adjusted by the balance weights 309 and 310, so that the first crankshaft 308, Even if the piston complex P rotates around the first crankshaft 308 with the reciprocating motion of the plurality of pistons 301 and 302, the rotational vibration can be suppressed and noise reduction can be achieved. Therefore, the structure of the sealed box 35 (see FIG. 8) in which the compressor 105 is disposed in a vibration-proof state can be simplified, and the soundproofing material 51 provided in the two-stage soundproofing chamber 34 is the minimum necessary. Therefore, it is possible to simplify the structure of the oxygen concentrator 1 and contribute to size reduction and weight reduction.

  Further, the mounting structure of the compressor 105 can be simplified by omitting mechanical parts such as a crankshaft and a crank arm and reducing the rotational vibration described above. For example, in FIG. 12, the compressor 105 is fixed so as to be sandwiched from above and below by a compressor fixing base 61 in the two-stage soundproof chamber 34, so that vibration can be efficiently absorbed by the coil spring 62. It becomes possible to make the coil spring 62 that acts as a simplified structure having a small spring constant.

  In addition, the first crankshaft 308 rotates around a shaft 304 while drawing a concentric circular orbit, and the second virtual crankshafts 314a and 314b rotate around the first crankshaft 308 (internal cycloid). Since the plurality of pistons 301 and 302 reciprocate along, it is possible to provide an efficient oxygen concentrator 1 with good rotational balance, low vibration, and low noise.

The electric motor M used as a drive source for the compressor 105 may be either a DC motor or an AC motor. Further, it may be either an induction motor or a synchronous motor.
For example, in the two-piston type compressor disclosed in the present embodiment, when a single-phase four-pole AC synchronous motor is used, the peak of the motor output and the peak of the load (compression and suction) of the compressor are matched to each other. Efficient driving can be realized.

M Electric motor P Piston complex 1 Oxygen concentrator 2 Front cover 3 Back cover 4 Handle 5 Operation panel 6 Power switch 7 Oxygen outlet 8 Oxygen flow 14 Nasal cannula 15 Tube 17 Replacement lid 20 Outside air introduction filter 23 Speaker 32 Shield plate 34 Two-stage soundproof room 35 Sealed box 38,39 Soundproof room cover 40 Base 41 Bottom cover 48,50 Saddle 51 Soundproof material 101 Intake filter 102 Intake buffer tank 104 Blower fan 105 Compressor 105a Compressed air generating part 105b Negative pressure air generating part 107 equal pressure valve 108a first adsorption cylinder 108b second adsorption cylinder 109a, 109b switching valve 110 silencer 111 product tank 112 pressure regulator 114 oxygen concentration sensor 115 proportional opening valve 116 oxygen flow sensor 117 demand valve 119 extinction Filter 120 First negative pressure release valve 121 Second negative pressure release valve 128 Mounting board 200 Central control unit 201 Motor control unit 202 Negative pressure circuit board 203 Audio control unit 204 Display operation unit 205 Volatile memory 206 Temporary storage device 207 Real time clock 226 Power supply device 228 Built-in battery 300 Rotary cylinder device 301 First piston 301a Escape hole 301c First piston head part 301d Base 301f Stepped part 302 Second piston 302c Second piston head part 303 Eccentric cylinder 303a First cylinder 303b First Two cylinders 304 Shaft 305 First body case 301b, 302b, 303c, 303d, 305a, 306a Bearing holding portion 305b, 306b, 320, 321a Opening portion 301e, 305c, 305d, 306c 306d, 309a, 310a,
318c, 321e Bolt hole 306 Second body case 307 Body case 307a, 312a, 312b, 319, 322 Bolt 304 Shaft 308 First crankshaft 308a Slit 308b Pin hole 308c D cut part 309, 310 Balance weight 309b, 310b Pin hole 310c Shaft portion 311a, 311b Pin 313a First bearing portion 313b Second bearing portion 314a, 314b Second virtual crankshaft 315a, 315b Inner bearing portion 316a, 316b Outer bearing portion 317a, 317b Seal cup 317c Standing portion 318a, 318b Seal cup holder Member 320a first opening 320b second opening 321 cylinder 323 rolling circle 324 virtual circle 325 first cylinder head 326 second cylinder head 327a, 27b, 327c, 327d cylinder chamber 328 inlet 329 delivery port 330 rotation path 331 output shaft 401 supply chamber 402 battery chamber 403 accommodating chamber

Claims (5)

A compressor that compresses raw material air to generate compressed air;
An adsorption cylinder storing an adsorbent that adsorbs nitrogen from the compressed air sent from the compressor,
The compressor is configured to generate a compressed air generator and a negative pressure air by reciprocating a linear motion piston linked to an eccentric cylinder rotating around a crankshaft eccentric with respect to a drive shaft. An oxygen concentrating device comprising a rotary cylinder device that alternately forms a portion. The rotary cylinder device is:
A first crankshaft assembled eccentrically with respect to an axis of a shaft connected to the drive shaft, and assembled rotatably about the shaft via a first virtual crank arm;
A plurality of second virtual crankshafts are assembled eccentrically with respect to the axis of the first crankshaft, and the eccentric is assembled rotatably about the first crankshaft via a second virtual crankarm. A cylinder, and a piston complex in which a plurality of pistons are assembled to the eccentric cylinder so as to center on each second virtual crankshaft;
A balance weight that is assembled around the shaft and takes a mass balance of rotational movement around the shaft including the first crankshaft and the piston complex;
A main body case in which a cylinder that rotatably supports the shaft and accommodates a plurality of pistons of the piston complex so as to reciprocate is assembled;
When the shaft is driven to rotate, the first crankshaft rotates on the rotation trajectory defined by the first virtual crank arm, and the rotation trajectory defined by the second virtual crank arm is centered on the first crankshaft. 2. The plurality of pistons assembled so as to intersect the eccentric cylinder about the second virtual crankshaft reciprocate in the cylinder by rotating the two virtual crankshafts without seemingly slipping. Oxygen concentrator.   The eccentric cylindrical body is axially formed with a first cylindrical body fitted concentrically with the first crankshaft and a second virtual crankshaft eccentric with respect to the axial center of the first cylindrical body. 3. The oxygen concentrator according to claim 1, further comprising a second cylinder formed continuously, wherein the plurality of pistons are fitted into the second cylinder so as to be rotatable.   The oxygen concentrator according to claim 2 or 3, wherein the piston complex is assembled such that a plurality of pistons overlap with each other at the intersections with respect to the eccentric cylindrical body.   The distance r between the shaft centers of the shaft and the first crankshaft is defined as the arm length of the first virtual crankarm and the second virtual crankarm, and the first virtual crankarm length r around the shaft core is defined as the radius. When the first crankshaft rotates on the rotation path, the second virtual crankshaft apparently slides on a virtual circle having the radius of the second virtual crank arm length r centered on the first crankshaft. 5. The oxygen concentration according to claim 2, wherein the plurality of pistons reciprocate in a radial direction of a rolling circle having a radius R (2r) of the virtual circle as a radius by rotating without rotation. apparatus.

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