JP2008025350A - Vane rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane rotary type compressor for securing high-rotating-speed reliability by increasing the allowable rotating speed of the compressor to maintain or improve cooling performance, resulting in a smaller size, a lighter weight and high performance as recently required for an automobile air conditioning compressor. <P>SOLUTION: The trapezoidal shape of a vane is optimized to reduce a contact area between the end face of a vane side and each of a front side plate and a rear side plate and reduce contact resistance, thereby suppressing heating due to contact and abnormal wear. Even when the vane jumps out of a vane groove, the friction resistance of the vane side is reduced and the back pressure loss of the vane is also reduced. The vane is therefore smoothly started/operated. Reducing the contact resistance of the vane side increases the pushing force of the vane on a cylinder to prevent noises including vane chattering and improving performance/efficiency. This effectively increases the strength of the vane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vane rotary type compressor used for an air conditioner for automobiles and the like.

  1 and 2 show a vane rotary type compressor. As shown in FIG. 1 and FIG. 2, the vane 13 is assembled so as to protrude and retract in the vane groove 12 formed in the rotor 10, slides on the inner wall of the cylinder 1, and the cylinder 1, the rotor 10, and the vane 13 A working space 7 is formed by the front side plate 2 and the rear side plate 3.

  Power is transmitted from the engine (not shown) to the compressor via a belt (not shown), and the rotor 10 rotates, whereby the refrigerant is sucked into the working space 7 in the cylinder 1 from the suction port 8 and the working space. 7 is discharged from a discharge port 9 formed in the cylinder 1.

  This type of vane rotary type compressor has a resin coating applied to the outer peripheral surface of the rotor 10 as a countermeasure for seizure, or the front side plate 2 and the rear side plate 3 are made into ADCs 12 (aluminum die-casting). Some of them are SCM415 (chrome molybdenum steel) harder than the ADC 12 (see, for example, Patent Document 1).

In recent years, a compressor used in such an air conditioner for automobiles is strongly required to be small, light and highly efficient. In particular, because there is a strong demand for downsizing and weight reduction, downsizing is achieved by reducing the displacement of the compressor, and cooling is performed by increasing the number of revolutions during compressor operation so that the cooling performance is not impaired. Maintains or improves performance. Therefore, it is necessary to ensure reliability at a high rotational speed.
JP 2005-2825 A

  However, in the conventional configuration, when the compressor is operated at a higher speed than the allowable rotation of the compressor, the heat generation temperature due to the contact of the sliding portion is increased, and the members such as the rotor, the front and rear side plates, and the vane are provided. It expands, resulting in problems such as the occurrence of seizure because a minute gap between the front side plate and the rotor cannot be secured. In addition, the fact that the rotation speed exceeds the allowable number of rotations means that the load on the compressor increases, and it is assumed that there is a possibility of having a design problem such as the strength of the vane thickness.

  The present invention solves such problems, and ensures high reliability and durability even when operated at a high speed 1.2 to 1.5 times that of the conventional allowable rotation, and is small and lightweight.・ Provide high-performance vane rotary compressors.

  In order to solve the above problems, the shape of the vane is a polygon. As a result, the contact area between the vane side end face and the front side plate and the rear side plate is reduced and the contact resistance is reduced, so that heat generation due to contact, abnormal wear, and the like can be suppressed. Further, the vane side frictional resistance is reduced and the vane back pressure loss is reduced even when the vane jumps out of the vane groove. Therefore, the vane starts and operates smoothly. In addition, a decrease in the contact resistance on the vane side increases the force with which the vane pushes the cylinder, thereby preventing noise such as vane chattering and improving performance and efficiency. In addition, the vane strength can be increased.

  The vane rotary type compressor of the present invention can ensure high reliability even if it rotates at a high speed of about 1.2 to 1.5 times the allowable rotational speed of the conventional compressor. Therefore, it is possible to provide a high-performance and highly-commercial product as a compact and lightweight compressor that has been required in recent years.

  The present invention reduces the contact resistance between the front side plate and the rear side plate by changing the conventional vane shape from a rectangular shape to a polygonal shape, particularly a trapezoidal shape. The back pressure also increases, the vane operation becomes smooth, the vane noise can be improved, and the strength of the vane can be increased. As a result, it is possible to increase the conventional compressor permissible rotational speed, and it is possible to provide a product that can respond to the reduction in size and weight required for the compressor.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a vane rotary type compressor according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG.

  1 and 2, a substantially columnar rotor 10 is rotatably accommodated in a cylinder 1 having a cylindrical inner wall so that a part of the outer periphery forms a minute gap with the inner wall of the cylinder 1. In the rotor 10, a plurality of vane grooves 12 are provided at equal intervals, and vanes 13 are inserted into the vane grooves 12 so as to be able to appear and retract. The rotor 10 is formed integrally with the rotating shaft 11 and rotates when the rotating shaft 11 is rotationally driven. Both end openings of the cylinder 1 are closed by the front side plate 2 and the rear side plate 3, the tip of the vane 13 abuts against the inner wall of the cylinder 1, and the working chamber 7 is formed inside the cylinder 1.

  The working chamber 7 communicates with the suction port 8 and the discharge port 9. The discharge port 9 communicates with the high pressure passage 4, and a discharge valve 19 is disposed between the discharge port 9 and the high pressure passage 4. A high pressure case 5 is attached to the rear side plate 3, and a high pressure chamber 20, a separation chamber 15, and an oil storage chamber 17 are formed in the high pressure case 5. The high-pressure chamber 20 and the separation chamber 15 are communicated with each other through the introduction hole 14 at the top of the high-pressure chamber 20.

  Further, a discharge hole 16 is provided in the lower part of the separation chamber 15, and the separation chamber 15 and the oil storage chamber 17 are communicated. In the separation chamber 15, the lubricating oil contained in the compressed high pressure fluid is centrifuged. The lubricating oil stored in the oil storage chamber 17 is supplied to the rotor 10, the vane 13, the inner wall of the cylinder 1 and the like constituting the compression mechanism via the oil supply passage 18, lubricates each part, and is supplied to the back of the vane. The vane 13 is pushed out of the rotor 10 by the pressure of the back portion. By providing a reintroduction hole 21 that allows fluid movement between the upper part in the oil storage chamber 17 and the separation chamber 15, a gas flow such as a refrigerant gas stored in the upper part of the oil storage chamber 17 is supplied to the separation chamber 15. The oil level in the separation chamber 15 is moved so as to be equal to or slightly downward in the vertical direction with respect to the oil level in the oil storage chamber 17.

  When the rotating shaft 11 and the rotor 10 are rotated in the clockwise direction (Z direction) in FIG. 2 in response to power transmission from a driving source such as an engine, a low-pressure fluid (refrigerant) enters the working chamber 7 from the suction port 8. Inflow. The high pressure fluid compressed with the rotation of the rotor 10 pushes up the discharge valve 19 from the discharge port 9 and is discharged into the high pressure passage 4 and flows into the high pressure chamber 20.

About the shape of the vane 13, the width dimension of the conventional rectangular vane is made smaller than the width dimension of a rotor. In the vane dimensions of the invention, the bottom dimension of the vane (vane back pressure side) is the same as the rotor dimension including variation, and the upper dimension of the vane (cylinder contact side) is the same as the dimension of the conventional vane, as shown in FIG. It has a trapezoidal shape. However, depending on the displacement of the compressor, the allowable number of revolutions, etc., if the vane has a polygonal shape instead of the shape shown in FIG.

  About the vane rotary type compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, a rotating shaft 11 that is driven by a belt from a vehicle engine (not shown) and is integrally formed with the rotor 10 is axially supported by the front side plate 2 and the rear side plate 3, and when the rotor 10 rotates, The volume changes, and the refrigerant containing lubricating oil is sucked, compressed, and discharged. The refrigerant containing the discharged lubricating oil is separated in the separation chamber 15 formed in the high-pressure chamber 20 and stored in the oil storage chamber 17.

  As described above, in the present embodiment, the width of the conventional rectangular vane is made smaller than the width L of the rotor in the shape of the vane 13, whereas in the present invention, the bottom dimension L1 ( The vane back pressure side) is made equal to the rotor dimension, and the vane upper side dimension L2 (cylinder contact side) is trapezoidal so that L ≧ L1> L2.

  Thus, in the conventional rectangular vane, the entire side area of the vane and the front side plate 2 or the rear side plate 3 are in contact with each other, but the trapezoidal vane of the present invention is in line contact with the bottom surface of the vane, and the contact resistance is low. Reduced heat generation and abnormal wear of the vanes can be suppressed, and the durability and reliability can be improved and the vane strength can be increased.

  In addition, since the vane bottom dimension is slightly larger than the conventional vane dimension, the force with which the vane 13 pushes the inner wall of the cylinder 1 is increased, so that noise such as vane chattering can be reduced and performance and efficiency can be improved.

  As described above, the vane rotary type compressor according to the present invention can be applied to applications such as a hydraulic pump and a hydraulic pump, because high-speed rotation, improved reliability, and improved performance are possible.

1 is a cross-sectional view of a vane rotary compressor according to Embodiment 1 of the present invention. AA sectional view of FIG. The figure which shows the shape of the vane in Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Front side plate 3 Rear side plate 4 High pressure passage 5 High pressure case 6 Suction port 7 Working space 8 Suction port 9 Discharge port 10 Rotor 11 Rotating shaft 12 Vane groove 13 Vane 14 Introduction hole 15 Separation chamber 16 Discharge hole 17 Oil storage chamber 18 Oil supply passage 19 Discharge valve 20 High pressure chamber 21 Reintroduction hole

Claims (2)

A cylinder having a cylindrical hollow portion therein, a substantially cylindrical rotor in which at least a part of the outer peripheral portion is rotatably disposed close to the inner wall surface of the cylinder, and a plurality of the rotor in a substantially radial manner The vane groove is incorporated into the vane groove so as to be freely retractable, the tip abuts against the inner wall surface of the cylinder, and the compression space formed between the cylinder and the rotor is divided into at least a suction space and a discharge space. In a vane rotary type compressor comprising a vane, a front side plate and a rear side plate constituting a compression chamber by closing both ends of a cylinder, a suction port communicating with the suction space, and a discharge port communicating with the discharge space, A vane rotary compressor characterized in that the shape of the vane is a polygon. The vane rotary compressor according to claim 1, wherein the shape of the vane is a trapezoid.

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