JP2012087665A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a conventionally configured rotary compressor, which has a groove in a cylinder inner diameter face for communicating a blade sliding groove with a suction hole to avoid an input increase due to the enlargement of a minute space encircled by a blade, a cylinder and a roller from a top dead center position of the blade as remaining in a vacuum condition, causes reliability degradation such as blade burning due to the surface pressure rise of a blade sliding part during the operation of the compressor and requires an additional machining process for providing the communicating groove.SOLUTION: In the conventionally configured rotary compressor, the suction hole side chamfer of a cylinder inner peripheral face opening portion of the blade sliding groove is formed large enough to cover the suction hole, thus suppressing the surface pressure rise of the blade sliding part while avoiding the input increase due to a vacuum condition, and achieving the improved efficiency and improved reliability and productivity of the compressor without providing the additional machining process.

Description

  According to 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, and a blade that divides the cylinder chamber into a compression chamber and a suction chamber is provided. , Related to a rotary compressor that is slidably mounted in a blade sliding groove formed in a cylinder as the roller rotates eccentrically, and particularly relates to a rotary compressor having an improved shape near the blade sliding groove of the cylinder It is.

  In the conventional rotary compressor, as shown in FIG. 4, a cylinder chamber 2 is formed in a cylinder 4 housed in a hermetic casing 1, and a roller 3 is rotatably housed in the cylinder chamber 2. The eccentric shaft 5 is inserted into the roller chamber 3, and the roller 3 is rotated eccentrically in the cylinder chamber 2 by the rotation of the eccentric shaft 5.

  A blade sliding groove 4a extending in the radial direction is formed in the cylinder 4, and the blade 9 that is always in pressure contact with the outer peripheral surface of the roller 3 can be slid by the spring 6 disposed on the back side of the blade sliding groove 4a. The blade chamber 9 divides the cylinder chamber 2 into a compression chamber side X where the discharge port opens and a suction chamber side Y where the suction hole 8 opens.

  In this apparatus, when the eccentric shaft 5 rotates, the gas refrigerant enters the cylinder chamber 2 through the suction hole 8 and is compressed in the compression chamber side X, and then discharged from the discharge port.

  Here, until the minute space 7a newly formed in the cylinder 4 rotates in the direction of arrow B from the top dead center and opens to the suction hole 8, the minute space 7a is in a vacuum state, and the required power increases. However, in order to prevent this, as shown in FIG. 5, a groove 13 for communicating the blade sliding groove 4 a and the suction hole 8 is provided on the inner surface of the cylinder.

  In such a rotary compressor, it is necessary to provide a new processing step in order to reduce the reliability such as blade seizure due to an increase in surface pressure at the blade sliding portion and to provide the communicating groove 13.

Japanese Utility Model Publication No. 02-014492

  In the conventional rotary compressor, in order to prevent an increase in required power due to a vacuum state, a groove that communicates the blade sliding groove and the suction hole is provided on the inner surface of the cylinder. In addition to causing a decrease in reliability such as blade seizure due to the rise, it is necessary to provide a new processing step in order to provide the communication groove.

  The present invention solves the above-described conventional problems, and suppresses the increase in the surface pressure of the blade sliding portion, and uses the existing chamfering process to provide the reliability of the rotary compressor without providing a new processing process. And it aims at realizing productivity improvement.

In order to solve the above-mentioned problems, the means according to claim 1 of the present invention includes a roller that rotates in accordance with the eccentric rotation of the eccentric shaft in the cylinder chamber, and a blade that divides the cylinder chamber into a compression chamber and a suction chamber. Is a rotary compressor that is slidably mounted in the blade slide groove so that it can slide along with the eccentric rotation of the roller, and the suction hole side chamfering of the cylinder inner surface opening of the blade slide groove is set to a size that covers the suction hole. Thus, the minute space surrounded by the blade, the cylinder, and the roller communicates with the cylinder chamber.

  This is a rotary compressor that holds the sliding surface between the blade sliding groove of the cylinder and the blade while preventing an increase in required power due to the vacuum state from the top dead center until the minute space opens into the suction hole. is there.

  As a result, the increase in the surface pressure of the blade sliding portion is suppressed, and the reliability and productivity of the compressor are improved by solving the above problems without providing a new processing step.

  In the rotary compressor of the present invention, an increase in the surface pressure of the blade sliding portion is suppressed while avoiding an increase in input due to a vacuum state, and there is no need to provide a new processing step. Reliability and productivity can be improved at the same time.

Sectional drawing of the rotary compressor in embodiment of this invention Part A enlarged view of the rotary compressor shown in FIG. The perspective view which looked at the cylinder shown in FIG. 2 from diagonally upward Sectional view of a rotary compressor showing a conventional example The perspective view which looked at the cylinder shown in FIG. 4 from diagonally upward Cylinder cross section of rotary compressor in 4th invention Cylinder cross section of rotary compressor in 5th invention

  According to a first aspect of the present invention, a cylinder chamber is formed in a cylinder housed in a hermetically sealed casing, and a roller that rotates along with the eccentric rotation of the eccentric portion of the drive shaft is housed in the cylinder chamber, and the cylinder chamber is compressed. In a rotary compressor in which a blade partitioned into a chamber and a suction chamber is slidably mounted in a blade sliding groove formed in the cylinder as the roller rotates eccentrically, the inner circumference of the cylinder in the blade sliding groove By taking the suction hole side chamfering of the surface opening so as to be applied to the suction hole, the increase in the surface pressure of the blade sliding part is suppressed while preventing the increase in required power due to the vacuum state, and there is no need for a new processing step. The efficiency improvement and reliability and productivity improvement of the rotary compressor can be realized.

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

  According to a third aspect of the present invention, in the rotary compressor using a natural refrigerant such as carbon dioxide, ammonia or helium as the refrigerant used in the rotary compressor of the first aspect, the same effect as the first aspect can be obtained.

  As shown in FIG. 6, the fourth invention is the same as the first invention by setting the angle between the blade sliding surface 11 and the suction hole side chamfering surface G of the first to third inventions to 45 °. An effect is obtained.

As shown in FIG. 7, the fifth aspect of the invention sucks the suction hole side chamfer by making the angle between the blade sliding groove surface of the first to third inventions and the suction hole side chamfer surface 45 ° or more. The blade sliding surface 12 on the suction hole side can be secured larger than that of the fourth invention while being applied to the hole, and a highly reliable compressor can be provided while obtaining the same effect as that of the fourth invention. it can.

  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 sectional view of a rotary compressor according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 shows a three-dimensional view of the cylinder shown in FIG. As shown in FIG. 1, the compressor forms a cylinder chamber 2 in a cylinder 4 housed in a hermetic casing 1, and a roller 3 is rotatably housed in the cylinder chamber 2, and the roller 3 extends from a motor. The eccentric shaft 5 is inserted, and the rotation of the eccentric shaft 5 causes the roller 3 to rotate eccentrically in the cylinder chamber 2, while the cylinder 4 is formed with a blade sliding groove 4a extending in the radial direction. A blade 9 that is always pressed against the outer peripheral surface of the roller 3 by a spring 6 disposed on the back side thereof is slidably provided in the sliding groove 4a, and the inside of the cylinder chamber 2 is discharged into the discharge port by the blade 9. Is divided into a compression chamber side X that opens and a suction chamber side Y that opens the suction hole 8.

  In the rotary compressor configured as described above, the shape from the blade sliding groove 4a formed in the cylinder 4 to the suction hole 8 side of the cylinder is as shown in FIG. The chamfered portion 10 on the suction hole side of the peripheral surface opening is sized to cover the suction hole 8.

  With this configuration, the minute space 7 a surrounded by the blade 9, the cylinder 4, and the roller 3 communicates with the cylinder chamber 2, and depends on the vacuum state from the top dead center until the minute space 7 a opens to the suction hole 8. While preventing the required power increase, the increase in the surface pressure of the blade sliding portion is suppressed, and the efficiency, reliability, and productivity of the rotary compressor are improved without providing a new processing step.

  As described above, the rotary compressor according to the present invention can be used as a high-efficiency compressor for air conditioning, and the refrigerant used 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 Sealing casing 2 Cylinder chamber 3 Roller 4 Cylinder 4a Blade sliding groove 5 Eccentric shaft 6 Spring 7a Micro space 8 Suction hole 9 Blade 10 Chamfer 11 Blade sliding surface 12 Blade sliding surface 13 Groove G Chamfering surface H Chamfering Surface X Compression chamber side Y Suction chamber side

Claims (5)

A cylinder chamber is formed in the cylinder, and a roller that rotates with the eccentric rotation of the eccentric portion of the drive shaft is provided in the cylinder chamber, and a blade that divides the cylinder chamber into a compression chamber and a suction chamber includes the roller. In the rotary compressor that is slidably mounted in the blade sliding groove formed in the cylinder in accordance with the eccentric rotation of the cylinder, the suction hole side chamfering of the cylinder inner peripheral surface opening of the blade sliding groove is a suction hole A rotary compressor characterized by having a size that depends on 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 the angle between the blade sliding groove surface and the side surface of the suction hole is 45 °. The rotary compressor according to any one of claims 1 to 3, wherein the angle between the blade sliding groove surface and the side surface of the suction hole is 45 ° or more.