JPS61169690A - Compressor - Google Patents

Abstract

PURPOSE:To obtain a compressor having a high efficiency of making the inner wall part of the cylinder and the vane of a rotary type compressor from a same ceramic material and reducing the thermal expansion difference to zero and reducing the initial set clearance between the cylinder and the vane. CONSTITUTION:A ceramic ring 4 made of the ceramic material having a high abrasion resistance is inserted and fixed onto the inner peripheral surface of a cylinder 1, forming the inner wall part. The vanes 7a and 8a which contact in slidable ways with the inner surface of the ceramic ring 4 are made of the same material to the ceramic ring 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant compressor for an automobile illumination device.

BACKGROUND OF THE INVENTION Conventionally, cast iron has been used for the cylinder and high-silicon aluminum alloy has been used for the vanes that come into sliding contact with the cylinder. Regarding the selection criteria for these materials, since the cylinder requires strength and has a complex shape, it is made of cast iron, which has a large degree of freedom in shaping. High-silicon aluminum alloys are used because of the necessary wear resistance and light weight.

Problems to be Solved by the Invention However, with such a material structure, if the internal temperature of the compressor exceeds 150°C due to high-speed operation of the compressor, the cylinder made of cast iron material will break down. Due to the difference in thermal expansion between the vanes and the aluminum alloy, it becomes impossible for the vanes to rotate and slide.

In other words, the coefficient of thermal expansion of aluminum alloy is greater than that of cast iron, which causes seizure. Therefore, as a practical solution, the dimensions of the aluminum alloy vanes are machined to be small in advance to prevent seizure even when the compressor reaches high temperatures. However, setting a large initial gap between the cylinder and the vane from the beginning poses a problem in terms of compressor efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compressor that does not cause vane seizure even when the compressor reaches a high temperature and has high compression efficiency.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes a cylindrical cylinder, a rotor rotatably supported within the cylinder, and a plurality of vanes formed on the rotor. The compressor is composed of vanes that engage with grooves, and the cylindrical inner wall of the cylinder and the vanes are made of a ceramic material.

Effect In the above configuration, the inner wall of the cylindrical cylinder and the vanes are made of highly wear-resistant ceramic material, so even if the compressor reaches high temperatures, both expand evenly and prevent seizure. Of course, since the initial clearance between the cylinder and vane can be minimized, a highly efficient compressor can be realized.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2.

FIG. 1 is a cross-sectional view of the compressor, and FIG. 2 is a vertical cross-sectional view.

In the drawing, 1 is a cylindrical cylinder, 2゜2 is a side plate fixed to both end surfaces of the cylindrical cylinder 1, and a ceramic ring 4 is inserted and fixed to the inner peripheral surface 3 of the cylinder 1. A sealed cylindrical space is formed by the cylindrical inner surface 4a and the side plate 2.2. Reference numeral 5 denotes a rotor housed in the cylinder 1, and a rotating shaft 6 of the rotor 5 is supported by a side plate 2.2 at a position eccentric from the center A of the cylindrical space of the cylinder 1. A blade chamber Z is formed by the inner surface 4a of the ring. 7 and 8 are vane grooves formed on the outer periphery 5a of the rotor 5, and vanes 7a and 8 made of ceramic material are installed in the grooves 7.8.
A is engaged and supported, and each vane 7a, 3a pops out due to centrifugal force as the rotor 5 rotates, and the tip of A comes into contact with the inner surface 4a of the ceramic ring 4 of the cylinder 1, while the vanes 7a and 3a are in contact with the inner surface 4a of the ceramic ring 4 of the cylinder 1. Repeat inhalation, compression...and release. 9 is a suction hole, and 10 is a discharge hole.

That is, the ceramic ring 4 and the vane 7a.

Since 8a is made of the same ceramic material, it will thermally expand by the same amount even when the compressor reaches a high temperature, and it will not seize due to large thermal expansion unlike conventional aluminum alloy vanes. . Furthermore, since both cylinders 1 and 1 have the same expansion amount, the initial setting clearance between the cylinder 1 and the vanes 7a and 8a can be reduced, improving efficiency. Furthermore, in recent years,
As the performance of automobile engines increases, high-speed durability of compressors is required. By arranging the ring 4 and composing both of them with ceramic, it is possible to withstand higher speeds. Ceramic ring 4 and vane 7a.

Although 8a does not necessarily have to be made of the same ceramic material, it is preferable that the material has a similar coefficient of thermal expansion.

In this embodiment, the ceramic ring 4 is inserted into the cylinder 1 by processing the cylinder 1 and the ceramic ring 4 separately in advance, and then press-fitting the ceramic ring 4 into the cylinder 1. Note that, instead of using this method, cast iron or aluminum alloy may be integrated into the cylinder 1 by casting the ceramic ring 4 that has been processed in advance. Alternatively, it may be formed as a ceramic coating layer on the inner circumferential surface 3 of the cylinder 1 which has been processed in advance by thermal spraying or the like.

The compressor obtained by the above method has improved volumetric efficiency from 80% to 85% compared to the conventional one, and has a
It was confirmed that it could withstand high speeds of up to 8,500 rotations.

Effects of the Invention As described above, the present invention makes it possible to reduce the initial setting clearance between the cylinder and the vane by forming the cylindrical inner wall of the cylinder and the vane with a ceramic material, thereby improving the efficiency of the compressor and increasing the speed of the compressor. Durability can be achieved.

[Brief explanation of drawings]

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a cross-sectional view and FIG. 2 being a longitudinal cross-sectional view.

Claims (1)

[Claims] 1. A compressor comprising a cylindrical cylinder, a rotor rotatably supported within the cylinder, and vanes that engage with a plurality of vane grooves formed in the rotor, the cylindrical inner wall of the cylinder and the A compressor whose vanes are made of ceramic material.