JP6129708B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor.

  There exists patent document 1 as background art of this invention. Patent Document 1 describes an air compressor having a lip ring in which a surface from a sandwiching portion of a lip ring is formed as a straight surface and a surface from the tip of the lip portion of the lip ring is formed into a tapered surface that gradually decreases in diameter. ing.

Japanese Utility Model Publication No. 64-15782

  In the reciprocating compressor of Patent Document 1, a tapered surface is formed on the entire circumference of the lip ring regardless of the swinging direction to reduce the stress associated with the lip ring, thereby improving the life. However, since the gap between the retainer and the lip ring becomes large in the non-oscillating direction, the volume of air to be re-expanded and re-compressed becomes large, and the compression efficiency cannot be improved.

  Then, an object of this invention is to provide the compressor which made the improvement of compression efficiency and the lifetime improvement of a lip ring compatible.

  The present invention includes a cylinder, a retainer that forms a compression chamber between the cylinder, and a connecting rod connected to the retainer, reciprocating while swinging in the cylinder, and compressing a fluid And a lip ring that is attached to the retainer and seals between the cylinder and the piston, and the diameter of the retainer on the compression chamber side in the swinging direction is the diameter of the retainer in the non-swinging direction. A compressor characterized by being made smaller than the above is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the compressor which improved the compression efficiency and the lifetime improvement of the lip ring can be provided.

Sectional drawing (top dead center / oscillation direction) of the compression part of the compressor which concerns on the Example of this invention Sectional drawing (at the time of a peristaltic, peristaltic direction) of the compression part of the compressor which concerns on the Example of this invention Sectional drawing (top dead center and non-oscillating direction) of the compression part of the compressor which concerns on the Example of this invention Sectional drawing of the compressor which concerns on the Example of this invention

  Embodiments of a compressor according to the present invention will be described below with reference to FIGS.

  The overall configuration of the compressor according to the present embodiment will be described with reference to FIG.

  In the compressor according to the present embodiment, a rotating shaft 2 of a motor that drives the compressor is provided in a casing 1. The rotating shaft 2 of the motor is connected to the eccentric shaft 3 by a bearing 4, and the rotational motion of the rotating shaft 2 by the motor is converted into the eccentric motion of the eccentric shaft 3. The bearing 4 is provided with a weight 5 for balancing the eccentricity.

  A connecting rod 22 constituting the piston 21 is connected to the bearing 4, and the eccentric motion of the eccentric shaft 3 is converted into the reciprocating motion of the piston 21, and the piston 21 reciprocates while swinging in the cylinder 11.

  The piston 21 is an oscillating piston provided in the cylinder 11 so as to be able to reciprocate. The oscillating piston 21 is a disc-like member fastened by a bolt 23 to a connecting rod 22 provided with a disc-like mounting flange 22A. The retainer 24 is configured.

  The piston 21 according to the present embodiment will be described in detail with reference to FIG.

  The mounting flange 22A of the connecting rod 22 has a recess 22B at the center. Further, the retainer 24 has a convex portion 24 </ b> A at the center, and fits with the concave portion 22 </ b> B of the connecting rod 22.

  A compression chamber is formed between the retainer 24 and the cylinder head 12 attached to the cylinder 11, and the fluid in the cylinder 11 is compressed.

  A lip ring 25 provided between the connecting rod 22 and the retainer 24 on the outer peripheral side of the swing piston 21 is formed in a ring shape using a resin material. The lip ring 25 is sandwiched between the connecting rod 22 and the retainer 24 and is fixed in a state of being fastened by the bolt 23.

  Further, the lip ring 25 includes a flat mounting portion 25A and a lip portion 25B projecting radially outward, and the lip portion 25B is in sliding contact with the inner peripheral surface of the cylinder 11 with a tightening margin.

  The lip ring 25 is a bent portion 25C in which the space between the mounting portion 25A and the lip portion 25B is bent in an L shape.

  The lip ring 25 seals between the piston 21 and the cylinder 11 by opening and closing the lip portion 25 </ b> B following the inner peripheral surface of the cylinder 11.

  Here, the operation of the compressor according to the present embodiment will be described.

  When the rotating shaft 2 is rotated by the motor, the eccentric shaft 3 is eccentrically moved, and the eccentric motion of the eccentric shaft 3 is converted into the reciprocating motion of the connecting rod 22 by the bearing 4. Thereby, the piston 21 reciprocates while swinging, and the fluid in the compression chamber formed between the retainer 24 and the cylinder head 12 is compressed.

  When the piston 21 moves from the top dead center toward the bottom dead center, fluid is sucked into the compression chamber (suction process). When the piston 21 moves from the bottom dead center toward the top dead center, the fluid in the compression chamber is compressed (compression stroke).

  In the intake stroke, the intake valve 17 formed on the valve plate 14 is opened, so that fluid is drawn from the outside of the cylinder 11 into the compression chamber. On the other hand, the discharge valve 18 formed on the valve plate 14 is closed during the suction stroke. In the compression stroke, the fluid in the compression chamber is discharged to the external storage tank by opening the discharge valve. On the other hand, the intake valve is closed during the compression stroke.

  The retainer according to the present embodiment will be described in detail with reference to FIGS.

  FIG. 2 shows a cross-sectional view of the retainer with the left-right direction of the figure as the swinging direction. In the swinging direction of the outer periphery of the retainer 24, as shown in FIG. 2, the upper side (compression chamber side) has a smaller diameter than the lower side (connecting rod 22 side) in accordance with the deformation of the lip ring 25 during swinging. Is provided with a taper 24B.

  FIG. 3 shows a cross-sectional view of the retainer in which the left-right direction in the figure is the non-oscillating direction. In the non-oscillating direction of the outer periphery of the retainer 24, as shown in FIG. 3, a taper 24C is provided so that the upper side (compression chamber side) has a larger diameter than the lower side (connecting rod 22 side). .

  Further, the tapered shape of the outer periphery of the retainer 24 is configured so as to be smoothly connected in accordance with the deformation of the lip ring 25 during the swinging from the swinging direction toward the non-swinging direction.

  The upper surface (the surface on the compression chamber side) of the retainer 24 is an ellipse having a non-oscillating direction as a major axis and a oscillating direction as a minor axis. Further, the lower surface of the retainer 24 has a circular shape in which the diameter in the swinging direction is substantially equal to the diameter in the non-swinging direction. Thereby, it is possible to fix the lip ring 25 so as not to drop off while preventing excessive stress from being applied to the lip ring 25 from the lower surface of the retainer 24 that fixes the lip ring.

  Further, the clearance between the lip ring 25 and the upper surface of the retainer 24 (the surface on the compression chamber side) is larger in the swinging direction than in the non-swinging direction.

  In this embodiment, the upper surface (the surface on the compression chamber side) of the retainer 24 has an elliptical shape whose diameter in the swinging direction is smaller than the diameter in the non-swinging direction.

  In the present embodiment, since the diameter of the upper surface of the retainer 24 is small in the swinging direction, the lip ring 25 is generated by the lip ring 25 being sandwiched between the retainer 24 and the cylinder 11 during swinging. Stress can be reduced. Thereby, the lifetime of a lip ring can be improved.

  Furthermore, in the present embodiment, since the diameter of the upper surface of the retainer 24 is increased in the non-oscillating direction, the gap between the lip ring 25 and the retainer 24 is reduced, and the volume for repeated re-expansion and re-compression can be reduced. Therefore, it is possible to improve the compression efficiency (increase the discharge air amount).

  Further, in this embodiment, the diameter of the retainer 24, not the lip ring 25, is changed so that the lip ring 25 is not dropped from the lower surface of the retainer 24, while the lip ring 25 is not dropped. can do.

  As described above, in this embodiment, it is possible to achieve both improvement in compression efficiency and improvement in the life of the lip ring.

1 Casing 2 Shaft 3 Eccentric Shaft 4 Bearing 5 Weight 11 Cylinder 12 Cylinder Head 14 Valve Plate 17 Suction Valve 18 Discharge Valve 21 Swing Piston 22 Connecting Rod 24 Retainer 24B Taper 24C Taper 25 Lip Ring

Claims (4)

A cylinder,
A retainer that forms a compression chamber with the cylinder, and a connecting rod connected to the retainer, reciprocating while swinging in the cylinder, and compressing a fluid;
A lip ring attached to the retainer and sealing between the cylinder and the piston;
The diameter of the retainer on the compression chamber side in the swinging direction is smaller than the diameter of the retainer in the non-swinging direction ,
The compressor according to claim 1, wherein a diameter of the retainer on the compression chamber side in a non-peristaltic direction is larger than a diameter in the non-oscillating direction on the connecting rod side.   2. The compressor according to claim 1, wherein a diameter of the surface of the retainer on the compression chamber side in the swing direction is smaller than a diameter of the connecting rod on the swinging direction.   The compressor according to claim 1, wherein a side surface of the retainer has a tapered shape. A cylinder,
A retainer that forms a compression chamber with the cylinder, and a connecting rod connected to the retainer, reciprocating while swinging in the cylinder, and compressing a fluid;
A lip ring attached to the retainer and sealing between the cylinder and the piston;
The diameter of the retainer on the compression chamber side in the swinging direction is smaller than the diameter of the retainer in the non-swinging direction,
The compressor is characterized in that the clearance between the surface on the compression chamber side of the retainer and the lip ring is larger in the swinging direction than in the non-swinging direction .

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