JP2005245926A - To-and-fro type compression and decompression device and oxygen concentrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable to-and-fro type compression and decompression device and oxygen concentrator. <P>SOLUTION: The to-and-fro type compression and decompression device comprises a cylinder 37, a piston 38 capable of moving to-and-fro inside the cylinder 37, and a top and bottom dead point adjustable means 37E to move the cylinder 37 and relatively change top and bottom dead points of the piston 38 to the cylinder 37. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reciprocating compression decompressor and an oxygen concentrator.

  Conventional oxygen concentrators include, for example, a membrane oxygen concentrator using an oxygen permeable membrane and a pressure fluctuation adsorption oxygen concentrator using an adsorbent that preferentially adsorbs nitrogen gas in the air. It is done.

  The pressure fluctuation adsorption oxygen concentrator as an example of the latter includes an adsorption cylinder filled with an adsorbent that preferentially adsorbs nitrogen gas, and a compressor that supplies compressed air to the adsorption cylinder. It is common.

  The basic operation of this pressure fluctuation adsorption-type oxygen concentrator is as follows: first, an adsorption process for obtaining an oxygen-enriched gas containing concentrated oxygen by adsorbing nitrogen gas in the supplied air to the adsorbent; The oxygen-enriched gas is continuously obtained by repeating the desorption step of releasing the pressure increase pressure, desorbing nitrogen from the adsorbent, and regenerating the adsorbent at predetermined intervals.

  Such an oxygen concentrator includes, for example, “at least one adsorption cylinder filled with an adsorbent that selectively adsorbs nitrogen rather than oxygen, and an oscillating air compressor that supplies air to the adsorption cylinder. In the pressure fluctuation adsorption oxygen concentrator, the oscillating air compressor can change the position of the top dead center and the bottom dead center on the upper surface of the piston head according to the air supply amount without changing the rotation center and the eccentric amount. A medical oxygen concentrator comprising supply amount determining means for determining, wherein the supply amount determining means is connecting rod adjusting means for variably adjusting the length of the connecting rod of the oscillating air compressor. The medical oxygen concentrator according to claim 1 characterized by the above-mentioned has been proposed (see Patent Document 1).

JP 2003-225309 A (Claim 1, Claim 2, FIG. 2)

  In the medical oxygen concentrator according to Patent Document 1 described above, the top dead center and the bottom dead center are adjusted by adjusting the length of the connecting rod of the oscillating air compressor in order to adjust the compression ratio in the cylinder. The position of the point was adjusted. Therefore, it is easy to apply a large force to the connecting portion of the connecting rod, there is a possibility that the connecting rod may be damaged, and the durability is lowered.

  An object of the present invention is to solve such conventional problems and to provide a reciprocating compression decompressor and an oxygen concentrator excellent in durability.

  Means for solving the above-described problems include a cylinder, a piston capable of reciprocating inside the cylinder, and moving the cylinder to relatively change the top dead center and the bottom dead center of the piston relative to the cylinder. A reciprocating compression / decompression device comprising a dead point / bottom dead center variable means.

  In a preferred aspect of the reciprocating compression decompressor according to the present invention, the top dead center / bottom dead center variable means includes moving means for moving the cylinder relative to the top dead center and the bottom dead center. And a fixing means for fixing the cylinder so as not to move.

  Another means for solving the problem is an oxygen concentrator comprising the reciprocating compression decompressor.

  According to the present invention, by providing the top dead center / bottom dead center variable means, the top dead center and the bottom dead center can be changed without changing the length of the connecting rod such as a connecting rod for supporting the piston as in the prior art. Make the points relatively variable. Therefore, in the present invention, since the strength of the connecting rod is not reduced, a reciprocating compression decompressor having excellent durability can be obtained.

  Further, according to the present invention, the top dead center / bottom dead center variable means is provided with the moving means and the fixing means, so that the structure is simple and the number of components to be configured is increased. There is an advantage that there is no.

  Furthermore, according to the present invention, since the reciprocating compression decompressor is provided, the same operation and effect as described above can be obtained, so that it can be suitably used for an oxygen concentrator.

[Oxygen concentrator]
FIG. 1 is a block diagram showing an embodiment of an oxygen concentrator according to the present invention. An oxygen concentrator 1 according to an embodiment of the present invention includes an air intake 3, a dustproof filter 4, an intake filter 5, an intake muffler 6, and a reciprocating compression / decompressor from an upstream side to an air introduction path 2. 7, a first pressure sensor 7 </ b> A that measures the pressure in the adsorption cylinder, a pair of three-way switching valves 8 and 9, and a pair of adsorption cylinders 10 and 11 are provided. The adsorbent filled in the adsorption cylinders 10 and 11 is not particularly limited as long as it is an adsorbent that preferentially adsorbs nitrogen gas, and zeolite or the like can be employed.

  A cooling fan 12 is disposed in the vicinity of the reciprocating compression decompressor 7. A silencer 14 is provided in the exhaust passage 13 for exhausting nitrogen from the pair of adsorption cylinders 10 and 11 to eliminate intermittent exhaust noise. The reciprocating compression decompressor 7 will be described in detail below.

  Furthermore, a supply path 15 for supplying oxygen-enriched gas from the pair of adsorption cylinders 10 and 11 is configured. From the upstream side of the supply passage 15, a pressure equalizing valve 16 that is a two-way valve that adjusts the pressure between the adsorption cylinders 10 and 11, a pair of check valves 17 and 18 that prevent backflow of oxygen-enriched gas, and oxygen A product tank 19 for storing concentrated gas, a pressure regulator 20 for adjusting the pressure of the oxygen-enriched gas, a bacteria filter 21 for preventing passage of bacteria, etc., a flow rate of the oxygen-enriched gas, and a rotary using a fixed throttle A flow rate setting device 22 that is a switch, an oxygen sensor 23 that detects the oxygen concentration of the oxygen-enriched gas, a humidifier 24 that humidifies the oxygen-enriched gas, a second pressure sensor 24A that measures the pressure in the subsequent stage of the humidifier 24, An oxygen outlet 25 is provided.

  The oxygen concentrator 1 houses the above-described members in an exterior cover (solid line in FIG. 1). Further, the intake filter 5, the intake muffler 6, the reciprocating compression decompressor 7, the pair of three-way switching valves 8, 9, the cooling fan 12, and the silencer 14 are placed in a steel box (dotted line in FIG. 1). It is stored.

  Although not shown, the oxygen concentrator 1 is equipped with an electronic control device that controls the operation of the oxygen concentrator 1. This electronic control device includes a known microcomputer. The flow rate setting device 22, the oxygen sensor 23, the first pressure sensor 7A, the second pressure sensor 24A, and the like are connected to the input section of the microcomputer. Further, the reciprocating compression decompressor 7, the cooling fan 12, the three-way switching valves 8 and 9, the pressure equalizing valve 16 and the like are connected to the output portion of the microcomputer.

  Therefore, the electronic control unit includes a signal indicating the set flow rate set by the flow rate setting unit 22, the oxygen concentration detected by the oxygen sensor 23, and the inside of the adsorption cylinders 10 and 11 detected by the first pressure sensor 7A. And a signal indicating the pressure of the oxygen-enriched gas detected by the second pressure sensor 24A. Further, the electronic control device outputs control signals for controlling the operations of the reciprocating compression decompressor 7, the cooling fan 12, the three-way switching valves 8, 9, the pressure equalizing valve 16, and the like.

[Reciprocating compression decompressor]
FIG. 2 is a front view showing an example of a reciprocating compression decompressor according to the embodiment of FIG. FIG. 3 is a top view corresponding to the front view of the reciprocating compression decompressor of FIG. Further, FIG. 4 is a bottom view corresponding to the front view of the reciprocating compression decompressor of FIG. FIG. 5 is a VV sectional view showing an example of a reciprocating compression decompressor according to the embodiment of FIG. 6 is a VI-VI cross-sectional view of the reciprocating compression decompressor of FIG. Furthermore, FIG. 7 is a VII-VII sectional view of the reciprocating compression decompressor of FIG.

  As shown in FIGS. 2 to 7, the reciprocating compression decompressor 7 includes a pressurizing oscillating compressor 31 for sending compressed air to the adsorption cylinder, an oscillating vacuum pump 32 for reducing the pressure in the adsorption cylinder, One drive shaft 33 disposed between the pressurizing oscillating compressor 31 and the oscillating vacuum pump 32, and the pressurizing oscillating compressor 31, the oscillating vacuum pump 32, and the drive shaft 33 are supported. And a frame 34.

  Here, driving means such as a motor (not shown) is connected to the driving shaft 33. The drive shaft 33 is rotationally driven by the drive means (not shown).

  The frame 34 includes two frame plates 35 provided to face each other, and four frame pillars 36 fixed so as to be bridged over the frame plates 35.

  The frame plate 35 has a substantially square shape. A support hole 35 </ b> A that supports the drive shaft 33 is formed at the center of the frame plate 35. In addition, fixing holes 35B for fixing the frame pillars 36 are formed at four corners of the frame plate 35, respectively. Bearings 35C are provided in the support holes 35A, respectively. Note that the shapes and the like of the support hole 35A, the fixed hole 35B, and the bearing 35C may be appropriately changed according to the purpose.

  Cylinder fixing plates 35D are fixed to the edge of the frame plate 35 so as to face each other.

  On the other hand, the oscillating compressor 31 for pressurization and the oscillating vacuum pump 32 are provided on opposite edge sides of the frame 34 with the drive shaft 33 as the central axis. Each of the pressurizing oscillating compressor 31 and the oscillating vacuum pump 32 includes a cylinder 37, a top dead center / bottom dead center variable means 37E, and a piston 38.

  In this reciprocating compression decompressor 7, the structures of the oscillating compressor 31 for pressurization and the oscillating vacuum pump 32 are substantially the same, and therefore the description thereof will be omitted as appropriate.

  The cylinder 37 is fixed by a cylinder fixing plate 35D. The cylinder 37 includes a bottom surface portion 37A that forms a bottom surface portion of the cylinder 37, a cylindrical side wall portion 37B that is formed in a direction orthogonal to the bottom surface portion 37A, and an opening portion 37C that faces the bottom surface portion 37A. Prepare.

  The bottom surface portion 37 </ b> A is configured by a plate-shaped pump head plate 39.

  The bottom surface portion 37A and the side wall portion 37B respectively have a bottom surface portion through hole and a side wall portion through hole 37I that are located on the same straight line and are not shown.

  An O-ring 40 is interposed on the contact surface between the pump head plate 39 and the edge of the side wall 37B. The cylinder 37 on the pressurizing oscillating compressor 31 side has an inner diameter smaller than the inner diameter of the cylinder 37 on the oscillating vacuum pump 32 side.

  Further, a hollow pump head cover 41 having a substantially rectangular parallelepiped shape is fixed on the pump head plate 39. Inside the pump head cover 41, a partition inner wall 41 </ b> A is formed that is collinear with a connecting rod 48 described later (see FIG. 5) and extends in a direction parallel to the drive shaft 33.

  The inside of the pump head cover 41 is partitioned into two rooms by the partition inner wall 41A. In the cylinder 37 on the oscillating compressor 31 for pressurization, the inside of the pump head cover 41 is partitioned into a pressurizing chamber 42 and an intake chamber 43 by the partition inner wall 41A (see FIG. 3). On the other hand, in the cylinder 37 on the oscillating vacuum pump 32 side, the inside of the pump head cover 41 is partitioned into a decompression chamber 44 and an exhaust chamber 45 by the partition inner wall 41A (see FIG. 4).

  On the side wall surface of the pump head cover 41, insertion holes 41B are formed in a direction parallel to the drive shaft 33 so as to be able to pass through the inside of the pressurizing chamber 42, the intake chamber 43, the decompression chamber 44, and the exhaust chamber 45, respectively. Has been. Further, a cover through hole (not shown) is formed in the side wall surface (see FIG. 2) of the pump head cover 41 in a direction orthogonal to the drive shaft 33.

  The pump head plate 39 is provided with a valve device 46. The valve device 46 will be described in detail later.

  On the other hand, the top dead center / bottom dead center variable means 37E includes a moving means for moving the cylinder 37 relative to the top dead center and the bottom dead center, and a fixing means for fixing the cylinder 37 so as not to move. And comprising.

  In the present embodiment, the moving means includes a screw portion 37J and a bottom portion side nut 37L.

  The screw portion 37J is formed by forming a screw thread on a rod-like member extending in the forward direction of the piston 38 from the cylinder fixing plate 35D. The screw portion 37J passes through a bottom surface through hole (not shown), a cover through hole (not shown), and a side wall through hole 37I. Further, the screw portion 37J protrudes from the upper surface of a cover through hole (not shown).

  The bottom surface portion side nut 37L is screwed and fixed to the screw portion 37J protruding from the side wall portion through hole 37I.

  In the present embodiment, the fixing means is screwed and fixed to the screw portion 37J protruding from a cover through-hole (not shown), and with the bottom portion side nut 37L, the pump head cover 41, the bottom portion 37A, and The cover side nut 37K is provided to sandwich and fix the side wall portion 37B.

  The piston 38 is formed so as to be capable of reciprocating in the direction orthogonal to the drive shaft 33 inside the cylinder 37. The piston 38 includes a piston head 47 and a connecting rod 48 connected to the lower side of the piston head 47.

  The piston head 47 is a plate-like member having a shape corresponding to the cross-sectional shape of the cylinder 37. A cylinder chamber 37D is defined by the inside of the cylinder 37 and the piston head 47. That is, as the piston 38 moves between the top dead center and the bottom dead center, the piston head 47 changes the volume of the cylinder chamber 37D.

  A packing 49 and a packing retainer 50 are fixed to the piston head 47 from above the piston head 47. The packing 49 is formed in a shape corresponding to the shape of the surface of the piston head 47 and extending in a direction perpendicular to the reciprocating direction of the piston 38. The material of the packing 49 is not particularly limited as long as it has elasticity, and examples thereof include rubber.

  The packing retainer 50 is for fixing the packing 49 to the surface of the piston head 47, and a known member can be adopted.

  The connecting rod 48 converts the rotational motion of the drive shaft 33 and causes the piston head 47 to reciprocate in the direction orthogonal to the drive shaft 33 inside the cylinder 37. The connecting rod 48 includes a rod part 51 connected to the piston head 47 and an annular part 52 provided on the rod part 51.

  The rod part 51 is a substantially rod-shaped member. The annular portion 52 and the drive shaft 33 are connected so that the central axis of the annular portion 52 and the central axis of the drive shaft 33 are eccentric.

[Valve device]
2, specifically, as shown in FIGS. 5 to 7, the valve device 46 includes a through hole 61, lid means 62, and a machining groove (not shown).

  The through hole 61 is formed in the pump head plate 39 as a base material, and can introduce and / or discharge air as a fluid. Two through holes 61 are formed in the pressurizing chamber 42, the intake chamber 43, the decompression chamber 44, and the exhaust chamber 45. Air is introduced into and / or discharged from the cylinder chamber 37 </ b> D, the pressurization chamber 42, and the like. It becomes possible.

  The lid means 62 covers the through hole 61. The lid means 62 is entirely formed in a C-shape, and is integrally formed with a fixing portion 64 fixed to the pump head plate 39 and two arm portions 65 extending from the fixing portion 64. Become.

  The lid means 62 is fixed to the pump head plate 39 via the fixing portion 64 so as to cover the through holes 61 of the pressurizing chamber 42 and the exhaust chamber 45 as shown in FIGS. , See 7 solid line part). Further, depending on the intended use, the lid means 62 is connected to the pump head plate 39 via the fixing portion 64 so as to cover the through holes 61 of the intake chamber 43 and the decompression chamber 44 as shown in FIGS. You may make it fix (refer FIG. 6, 7 broken-line part).

  The fixing part 64 is formed in a circular shape. A fixing hole 64A for fixing a screw or the like is formed at the center of the fixing portion 64. The base end of the arm portion 65 is formed continuously with the fixing portion 64. The tip 65A of the arm 65 is formed in a circular shape. The tip 65A covers the through hole 61. The tip portion 65 </ b> A has an outer dimension larger than the inner diameter of the through hole 61.

  The processing groove is formed on the surface of the pump head plate 39 on the side where the lid means 62 covers the opening 61A of the through-hole 61, and is formed in an annular shape surrounding the opening 61A. The processing groove may be a single groove, but preferably has a plurality. Further, it is preferable that the processing groove is formed concentrically with the through hole 61.

  Examples of the method for forming the processing groove include a method of grinding the periphery of the through-hole 61 with a rotary grinder.

[Operation of oxygen concentrator, reciprocating compression decompressor, and valve device]
With reference to FIGS. 1-7, the effect | action of an oxygen concentrator, a reciprocating compression decompressor, and a valve apparatus is demonstrated below.

  First, a control signal for controlling the operation is input to the reciprocating compression decompressor 7 from an electronic control device (not shown). Thereafter, a motor (not shown) of the reciprocating compression decompressor 7 is operated, and a rotation shaft of the motor (not shown) rotates.

  The rotation of the rotation shaft of the motor is transmitted to the drive shaft 33. As the drive shaft 33 rotates, the connecting rod 48 causes the piston 38 to reciprocate between the top dead center and the bottom dead center in the vertical direction in the figure. As the piston 38 reciprocates, the air taken in from the outside of the reciprocating compression decompressor 7 is compressed and sucked.

  Here, the top dead center / bottom dead center variable means 37E relatively varies the top dead center and the bottom dead center of the piston 38 with respect to the cylinder 37 by the moving means and the fixing means. Specifically, the side wall portion 37B is movable in the vertical direction in FIG. While the bottom surface portion side nut 37L is screwed into the screw portion 37J, the side wall portion 37B is supported and fixed from the lower surface side by the bottom surface portion side nut 37L.

  When the side wall portion 37B reaches a predetermined position with respect to the top dead center and the bottom dead center of the piston 38, it is supported from the upper surface side of the pump head cover 41 by a cover side nut 37K that is screwed and fixed to the screw portion 37J.・ Fix it. The pump head cover 41, the bottom surface portion 37A, and the side wall portion 37B are sandwiched and fixed by the bottom surface portion side nut 37L and the cover side nut 37K.

  Further, air is released from the pressurizing chamber 42 and the exhaust chamber 45 by the action of the valve device 46, as shown in FIG. Further, air is sucked into the intake chamber 43 and the decompression chamber 44 by the action of the valve device 46 as shown in FIG.

  On the other hand, a predetermined amount of compressed air is supplied to the pair of adsorption cylinders 10 and 11 by switching the pair of three-way switching valves 8 and 9 from the reciprocating compression decompressor 7. Here, the nitrogen of the compressed air is adsorbed in one of the pair of adsorption cylinders 10 and 11, and the adsorbed nitrogen is desorbed in the other of the pair of adsorption cylinders 10 and 11. Switching between the adsorption and desorption is performed by performing predetermined operations on the pair of three-way switching valves 8 and 9, the pressure equalizing valve 16, and the pair of check valves 17 and 18.

  Nitrogen desorbed from the pair of adsorption cylinders 10 and 11 is sucked under reduced pressure by the oscillating vacuum pump 32 and the gas (nitrogen) in the adsorption cylinders 10 and 11 is exhausted through the silencer 14 to the outside of the oxygen concentrator 1. The

  On the other hand, an oxygen-enriched gas in which nitrogen is adsorbed and excluded from compressed air is generated by the pair of adsorption cylinders 10 and 11. The oxygen-enriched gas generated in the pair of adsorption cylinders 10 and 11 passes through a product tank 19, a pressure regulator 20, a bacterial filter 21, a flow rate setting device 22, and a humidifier 24, thereby obtaining a predetermined volume, pressure, flow rate, The oxygen-enriched gas that has been adjusted to humidity and from which bacteria and the like have been removed is discharged from the oxygen outlet 25 to the outside of the oxygen concentrator 1.

  The oxygen sensor 23 is disposed between the flow rate setting device 22 and the humidifier 24 to detect the oxygen concentration of the concentrated oxygen gas. The exhausted oxygen-enriched gas is supplied to a predetermined cannula connected to the oxygen concentrator 1, and an oxygen-enriched gas having a high oxygen concentration is supplied to the user.

According to this embodiment as described above, the following effects are obtained.
(1) By providing the top dead center / bottom dead center variable means 37E, the top dead center and the bottom dead center can be adjusted without changing the length of the connecting rod such as a connecting rod for supporting the piston as in the prior art. It is relatively variable. Therefore, in the present invention, since the strength of the connecting rod 48 as the connecting rod is not reduced, the reciprocating compression decompressor 7 having excellent durability can be obtained.

(2) The top dead center / bottom dead center changing means 37E includes the moving means and the fixing means. The moving means is provided with a screw part 37J and a bottom face side nut 37L, and the fixing means is provided with a cover side nut 37K, so that the structure is simple and the number of components to be configured is increased. There is an advantage that there is no.

(3) By including the reciprocating compression decompressor 7, the reciprocating compression decompressor 7 is excellent in durability, and thus can be suitably used for the oxygen concentrator 1 that requires durability.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention. The specific structure, shape, and the like at the time of carrying out the present invention may be other structures or the like as long as the object of the present invention can be achieved.

  In the above-described embodiment, the oxygen concentrator is provided with two adsorption cylinders 10 and 11, but is not limited thereto, and may be provided with three or more adsorption cylinders. In this embodiment, a vacuum pump is used for exhausting nitrogen (regeneration of the adsorption cylinder) from the inside of the adsorption cylinder by the vacuum regeneration pressure fluctuation method. However, the present invention is not limited to this. You may carry out by the normal-pressure reproduction | regeneration pressure fluctuation system which does not use a vacuum pump for exhaust_gas | exhaustion but performs natural openness under atmospheric pressure.

  In the above-described embodiment, the top dead center / bottom dead center varying means 37E includes a moving means and a fixing means, and the moving means includes a screw portion 37J and a bottom portion side nut 37L. Thus, although the fixing means is provided with the cover side nut 37K, it is not limited to this. As another example of the top dead center / bottom dead center varying means, for example, a mechanism including a rack provided on a side wall portion of a cylinder and a pinion meshing with the rack can be cited.

  Another example of the top dead center / bottom dead center varying means is a means for varying the length of the side wall portion of the cylinder with a jack.

  Furthermore, in the above-described embodiment, the reciprocating compression decompressor 7 includes both a pressurizing oscillating compressor 31 for sending compressed air to the adsorption cylinder and an oscillating vacuum pump 32 for reducing the pressure in the adsorption cylinder. However, the present invention is not limited to this, and is a reciprocating compressor having only a function of an oscillating compressor for supplying compressed air or a reciprocating decompressor having only a function of an oscillating vacuum pump for reducing pressure. There may be.

FIG. 1 is a block diagram showing an embodiment of an oxygen concentrator according to the present invention. FIG. 2 is a front view showing an example of a reciprocating compression decompressor according to the embodiment of FIG. FIG. 3 is a top view corresponding to the front view of the reciprocating compression decompressor of FIG. FIG. 4 is a bottom view corresponding to the front view of the reciprocating compression decompressor of FIG. 5 is a VV cross-sectional view showing an example of a reciprocating compression decompressor according to the embodiment of FIG. FIG. 6 is a VI-VI cross-sectional view of the reciprocating compression decompressor of FIG. 7 is a VII-VII cross-sectional view of the reciprocating compression decompressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oxygen concentrator 2 Introductory path 3 Air intake 4 Dust-proof filter 5 Intake filter 6 Intake muffler 7 Reciprocating compression decompressor 7A 1st pressure sensor 8 Three-way selector valve 9 Three-way selector valve 10 Adsorption cylinder 11 Adsorption cylinder 12 Cooling fan DESCRIPTION OF SYMBOLS 13 Exhaust path 14 Silencer 15 Supply path 16 Pressure equalizing valve 17 Check valve 18 Check valve 19 Product tank 20 Pressure regulator 21 Bacteria filter 22 Flow rate setting device 23 Oxygen sensor 24 Humidifier 24A 2nd pressure sensor 25 Oxygen outlet 31 For pressurization Oscillating compressor 32 Oscillating vacuum pump 33 Drive shaft 34 Frame 35 Frame plate 35A Support hole 35B Fixed hole 35C Bearing 35D Cylinder fixing plate 36 Frame column 37 Cylinder 37A Bottom surface 37B Side wall 37C Opening 37D Cylinder chamber 37E Top dead Variable point / bottom dead center 37I Side wall part through hole 37J Screw part 37K Cover side nut 37L Bottom part side nut 38 Piston 39 Pump head plate 40 O-ring 41 Pump head cover 41A Partition inner wall 41B Insertion hole 42 Pressurization chamber 43 Intake chamber 44 Decompression chamber 45 Exhaust chamber 46 Valve Device 47 Piston head 48 Connecting rod 49 Packing 50 Packing retainer 51 Rod part 52 Annular part 61 Through hole 62 Lid means 64 Fixing part 64A Fixing hole 65 Arm part 65A Tip part

Claims (3)

A cylinder, a piston capable of reciprocating inside the cylinder, and a top dead center / bottom dead center variable means for moving the cylinder to relatively change the top dead center and the bottom dead center of the piston relative to the cylinder. A reciprocating compression decompressor characterized by comprising. The top dead center / bottom dead center variable means is a moving means for moving the cylinder relative to the top dead center and the bottom dead center,
The reciprocating compression decompressor according to claim 1, further comprising a fixing means for fixing the cylinder so as not to move. An oxygen concentrator comprising the reciprocating compression decompressor according to claim 1 or 2.

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