JPH01253587A - Compressor - Google Patents

Abstract

PURPOSE:To reduce the heat conduction quantity to the compressed gas in a cylinder and improve the compression efficiency by arranging heat insulating plates between bearings supporting the shaft of a rotor eccentrically rotatably stored in the cylinder of an enclosed type compressor and the cylinder. CONSTITUTION:A roller 6 stored in the cylinder 7 of a compressor section via a shaft 5 fixed to a rotor 4 is eccentrically rotated by the drive of a motor constituted of a stator 3 and the rotor 4 stored in an enclosed shell 2 in an enclosed type compressor used for an air conditioner or the like. The gas to be compressed sucked through an intake pipe 10 is compressed and discharged through a discharge pipe. In this case, heat insulating plates 11 and 12 made of a stainless plate or the like are inserted between the main and auxiliary bearings 8 and 9 supporting the shaft 5 and the cylinder 7 respectively. The heat conduction quantity to the compressed gas in the cylinder 7 is thereby reduced, the pressure increase to the compressed gas is prevented, the compression efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is desired to be highly efficient from the viewpoint of energy used in refrigeration equipment, air conditioners, and the like.

An example of a conventional compressor will be described below with reference to the drawings.

FIG. 2 shows a cross-sectional view of a conventional compressor. In FIG. 2, 1 is a compressor. 2 is a sealed shell, 3 is a sealed shell 2
A stator 4 is shrink-fitted to the stator, a rotor 4 constitutes a motor in combination with the stator 3, and a shaft 5 is shrink-fitted to the rotor 4.

Further, 6 is a roller incorporated in the eccentric portion of the shaft 5;
8 is a main bearing of the shaft 6, 9 is a sub-bearing of the shaft 5, and 1° is a suction pipe press-fitted into the sub-bearing 9 and welded to the sealing shell /I/2. A shaft 5 is driven by a motor consisting of a stator 3 and a rotor 4.
rotates, and the roller 6 rotates eccentrically accordingly, thereby compressing the compressed gas introduced into the cylinder 7 through the suction pipe 1o.

Problems to be Solved by the Invention However, in the above configuration, the heat generated by the sliding of the main bearing 8 and the sub-bearing 9 and the shaft 6 is transferred to the main bearing 8.
It is transmitted directly to the compressed gas in the cylinder 7 through the plane where the secondary bearing 9 and the cylinder 7 are in contact, or indirectly to the compressed gas from the inner wall of the cylinder 7 through the cylinder 7. Then, the pressure of the compressed gas increases during suction and compression within the cylinder γ, and the amount of work required for compression increases, resulting in an increase in input to the compressor and a decrease in efficiency. Therefore, it was necessary to insulate the cylinder so that the sliding heat of the shaft 5 described above would not be transmitted to the compressed gas inside the cylinder.

In view of the above problems, the present invention aims to reduce the amount of heat conducted to the compressed gas in the cylinder 7, thereby obtaining a highly efficient compressor.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has a heat insulating plate installed between the cylinder and the main bearing or the sub bearing.

Function The present invention can reduce the amount of heat conducted to the compressed gas in the cylinder, prevent the pressure of the compressed gas from increasing, and provide a highly efficient compressor with the above-described configuration.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a compressor according to an embodiment of the present invention. In FIG. 1, 1 is a compressor. 2 is a sealed shell, 3
is a stator shrink-fitted to the hermetic shell 2; 4 is a rotor that is paired with the stator 3 to form a motor; 5 is a shaft shrink-fitted to the rotor 4; 6 is a roller incorporated in the eccentric portion of the shaft 6; 7 is a cylinder that accommodates the roller 6, 8 is a main bearing of the shaft 6, 9 is a sub-bearing of the shaft 5, 10 is a suction pipe press-fitted into the sub-bearing and welded to the sealed shell/l/2, and 11 is a main bearing. The heat insulating plates A and 12 installed between the bearing 8 and the cylinder 7 are the heat insulating plates B installed between the auxiliary bearing 9 and the cylinder 7. A shaft 5 is rotated by a motor constituted by a stator 3 and a rotor 4, and a roller 6 is eccentrically rotated accordingly, thereby compressing the compressed gas introduced into the cylinder through the suction pipe 1o.

Here, the heat insulating plate A11 and the heat insulating plate B12 were constructed of stainless steel plates with a thickness of 2. In order to confirm the effectiveness of this insulation board, we compared and evaluated the performance of the compressor with and without the insulation board.

(Conditions) Compressor capacity: 4.5cc Compressed gas: R12 Pressure conditions: High pressure 12-7 Kp/d G + low pressure 0. s
Ky/dG (JIS B12O3) (Results) As described above, in the example of the present invention, the capacity improved by +17/h,
An input reduction of Δ1W was achieved. This is thought to be due to the reduction in volumetric efficiency due to heat received during intake of compressed gas and the prevention of pressure increase due to heat received during compression.

Therefore, according to this embodiment, by installing a heat insulating plate A11 and a heat insulating plate B12 made of stainless steel with a thickness of 2 mm between the cylinder 7, the main bearing 8, and the sub bearing 9, respectively, the capacity of the compressor is increased by +17/h. The input power can be reduced by Δ1W.

In addition, in this example, conventional iron-based materials (thermal conductivity of approximately 50
Two 2n thick stainless steel plates (thermal conductivity approx. 15 W/mK) with a thermal conductivity of approximately % (W/mK) (insulating plates A11
．． The heat insulating plate B12) was used, but we believe that using just one of them will improve the performance of the compressor. It is believed that an effect greater than that of this example can be obtained by increasing the thickness of this heat insulating plate or by using a material with lower thermal conductivity such as zirconia ceramics.

Effects of the Invention As described above, the present invention can improve the performance of the compressor by installing a heat insulating plate between the cylinder and the main bearing or the sub bearing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional compressor.

Claims (1)

[Claims] A compressor comprising: a cylinder that takes in compressed gas; a main bearing and a sub-bearing installed to sandwich the cylinder; and a heat insulating plate installed between the cylinder and the main bearing or the sub-bearing.