JP2011089482A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that high pressure refrigerant gas returns to a compression chamber side again and causes performance drop due to re-compression since compressed refrigerant gas remains in a space after completion of compression although a chamfered shape of the compression chamber side of a cylinder inner diameter is formed large to reach a discharge port for preventing liquid compression operation and communication between the discharge port and the space surrounded by a blade, a cylinder and a roller is provided in a rotary compressor of a conventional structure. <P>SOLUTION: The chamfer shape of the compression chamber side of the cylinder inner diameter is formed smaller than of the rotary compressor of the conventional structure and a notch section is provided between the chamfer shape and the discharger port. Consequently, performances of the compressor are improved by reducing re-compression volume while preventing liquid compression operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  According to the present invention, a cylinder chamber is formed in a cylinder, and a roller that rotates with the eccentric rotation of an eccentric portion of a drive shaft is provided in the cylinder chamber, and the blade that partitions the cylinder chamber into a compression chamber and a suction chamber The present invention relates to a rotary compressor in which a blade sliding groove formed in the cylinder is slidably provided along with the eccentric rotation of the roller, and more particularly, a rotary compressor having an improved shape near the blade sliding groove portion of the cylinder It is about.

  As shown in FIG. 6, the conventional rotary compressor has a cylinder chamber 21 formed in a cylinder 2 housed in a hermetic casing 1, and a roller 3 is rotatably housed in the cylinder chamber 21. The eccentric part 41 of the drive shaft 4 is inserted, and the rotation of the eccentric part 41 causes the roller 3 to rotate eccentrically in the cylinder chamber 21, while the blade sliding groove 22 extending radially in the cylinder 2. The blade 5 is slidably provided on the outer periphery of the roller 3 by a spring 6 disposed on the back side of the sliding groove 22, and the cylinder chamber 21 is formed by the blade 5. A discharge chamber 23 is divided into a compression chamber and a suction port 24 is opened.

  Then, as shown in FIG. 8, in order to prevent an abnormal pressure increase in the cylinder chamber due to the liquid compression operation, the blade slide is made so that the discharge port 23 communicates with the space surrounded by the blade 5, the cylinder 2, and the roller 3. The chamfered shape on the compression chamber side on the cylinder inner diameter side of the dynamic groove 22 was increased until it was put on the discharge port.

  In such a rotary compressor, the high-pressure refrigerant gas remaining in the space surrounded by the blade 5, the cylinder 2, and the roller 3 at the completion of compression returns to the compression chamber X side during the subsequent rotation of the roller 3 and recompresses. Is causing performance degradation.

JP 2006-063942 A

  In the conventional rotary compressor, in order to prevent the liquid compression operation, the space surrounded by the blade 5, the cylinder 2, and the roller 3 and the discharge port 23 communicate with each other on the inner diameter side of the cylinder 2 of the blade sliding groove 22. The chamfered shape A on the compression chamber X side is greatly applied until it extends over the discharge port 23. When the compression is completed, the compressed refrigerant gas remains in the space, so that the high-pressure refrigerant gas returns to the compression chamber side again, It was causing performance degradation due to recompression motion.

  This invention solves the said conventional subject, and it aims at implement | achieving the performance improvement of a rotary compressor by reducing a recompression volume.

In order to solve the above-mentioned problems, according to a first aspect of the present invention, a cylinder chamber is formed in a cylinder, and a roller that rotates with the eccentric rotation of the eccentric portion of the drive shaft is provided in the cylinder chamber. A rotary compressor in which a blade that divides the cylinder chamber into a compression chamber and a suction chamber is slidably mounted in a blade sliding groove formed in the cylinder as the roller rotates eccentrically. Liquid compression operation is prevented by providing a notched part between the cylinder chamfer and the discharge port that allows communication between the space surrounded by the blade, cylinder, and roller and the discharge port, while providing a very small chamfer on the compression chamber side of the inner diameter. However, the rotary compressor has a reduced space volume.

  Thereby, the recompression volume can be reduced, and the performance of the compressor can be improved by solving the above-mentioned problems.

  The purpose of the rotary compressor of the present invention is to improve the performance of the rotary compressor by reducing the recompression volume.

Sectional drawing which shows the state which equipped the roller and the blade with the cylinder of the rotary compressor in the 1st Embodiment of this invention. Plan view of the cylinder of the rotary compressor shown in FIG. F part enlarged view of the cylinder shown in FIG. Sectional drawing of the cylinder of the rotary compressor in this invention 4 Sectional drawing of the cylinder of the rotary compressor in this invention 5 Sectional drawing which shows the state which equipped the roller and the blade in the cylinder with the rotary compressor which shows a prior art example Plan view of the cylinder of the rotary compressor shown in FIG. Enlarged view of the cylinder shown in FIG.

  According to a first aspect of the present invention, a cylinder chamber is formed in a cylinder, and a roller that rotates in accordance with the eccentric rotation of the eccentric portion of the drive shaft is provided in the cylinder chamber, and the cylinder chamber is divided into a compression chamber and a suction chamber. In the rotary compressor in which the blade is slidably mounted in the blade sliding groove formed in the cylinder in accordance with the eccentric rotation of the roller, the cylinder, the cylinder, By providing a notch portion between the cylinder chamfer and the discharge port so that the space surrounded by the roller and the discharge port communicate with each other, the space volume, that is, the recompression volume can be reduced, and the performance of the rotary compressor can be improved. .

  The second invention is a rotary compressor using a mixed refrigerant of HFC32 and HFC125 as a refrigerant used in the rotary compressor of the first invention, and the same effect as the first invention can be obtained.

  The third invention is a rotary compressor using a natural refrigerant such as carbon dioxide, ammonia, helium or the like as the refrigerant used in the rotary compressor of the first invention, and the same effect as in the first invention can be obtained.

  In the fourth invention, the same effect as that of the first invention can be obtained by making the cross-sectional shape of the notch portion of the first to third inventions linear as shown in FIG.

  In the fifth aspect of the invention, the same effect as that of the first aspect of the invention can be obtained by making the cross-sectional shape of the notch portion of the first to third aspects into a shape including a curve as shown in FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a schematic diagram of a rotary compressor according to a first embodiment of the present invention. In FIG. 1, the compressor forms a cylinder chamber 21 in a cylinder 2 housed in a hermetic casing 1, and a roller 3 is rotatably housed in the cylinder chamber 21, and a drive shaft 4 extending from the motor is mounted on the roller 3. The eccentric part 41 is inserted, and the roller 3 is eccentrically rotated in the cylinder chamber 21 by the eccentric rotation of the eccentric part 41, while the blade sliding groove 22 extending in the radial direction is formed in the cylinder 2, A blade 5 that is always pressed against the outer peripheral surface of the roller 3 by a spring 6 disposed on the back side of the sliding groove 22 is provided in the sliding groove 22 so as to be slidable. Is divided into a compression chamber in which the suction port is opened and a suction chamber in which the suction port 24 is opened.

  In the rotary compressor configured as described above, the shape of the blade sliding groove 22 formed in the cylinder 2 on the cylinder inner diameter side is communicated with the chamfer C on the compression chamber side and the discharge port 23 as shown in FIG. A notch portion D is provided between the two.

  As described above, in the present embodiment, a very small chamfer C is applied to the inner diameter side of the blade sliding groove 22 on the compression chamber side, and the space surrounded by the blade 5, the cylinder 2, and the roller 3 and the discharge port 24. By providing a notched portion B between the cylinder chamfer C and the discharge port 24, the recompression volume is reduced while preventing abnormal pressure increase in the cylinder chamber due to the liquid compression operation, and the performance of the rotary compressor Achieve improvements.

  As described above, the rotary compressor according to the present invention can be used as a high-efficiency compressor for air conditioning, and as a refrigerant used, it can be applied to all HCFC22 substitute refrigerants such as R407C regardless of R410A. It can also be applied to natural refrigerants such as carbon dioxide, ammonia and helium, which are attracting attention from the viewpoint of protecting the global environment.

DESCRIPTION OF SYMBOLS 1 Sealed casing 2 Cylinder 21 Cylinder chamber 22 Blade sliding groove 23 Discharge port 24 Suction port 3 Roller 4 Drive shaft 41 Eccentric part 5 Blade 6 Spring

Claims (5)

A cylinder chamber is formed in the cylinder, and a roller that rotates in accordance with the eccentric rotation of the eccentric portion of the drive shaft is provided in the cylinder chamber, and the blade chamber partitions the cylinder chamber into a compression chamber and a suction chamber. However, in the rotary compressor in which the blade sliding groove formed in the cylinder is slidably housed along with the eccentric rotation of the roller, the blade sliding groove is chamfered on the inner diameter side of the cylinder. A rotary compressor characterized in that a notch portion is provided between discharge ports. The rotary compressor according to claim 1, wherein a mixed refrigerant of HFC32 and HFC125 is used as a refrigerant to be used. The rotary compressor according to claim 1, wherein a natural refrigerant such as carbon dioxide, ammonia, or helium is used as a refrigerant to be used. The rotary compressor according to any one of claims 1 to 3, wherein a cross-sectional shape of the notch portion is constituted by a straight line. The rotary compressor according to any one of claims 1 to 3, wherein a cross-sectional shape of the cutout portion includes a curve.