JPH0417824Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hermetic electric compressor (hereinafter referred to as a compressor) used in a refrigeration system.

BACKGROUND ART In recent years, there has been a trend towards reducing loss in compressors in order to save power consumption in refrigeration equipment, and among these losses, friction loss at the eccentric shaft of the crankshaft accounts for a large proportion. An example of the conventional compressor mentioned above will be described below with reference to the drawings.

FIG. 3 shows a cross-sectional structure of a conventional compressor.

In Fig. 3, 1 is a closed container, 2 is a compression element elastically supported in the closed container 1, 3 is an electric element disposed on the top of the compression element 2, 3a is a stator, and 3b is a rotor. be. A crankshaft 4 is fixed to the rotor 3b and has an eccentric shaft 4a and a main shaft 4b. Reference numeral 5 denotes a bearing that pivotally supports the main shaft 4b of the crankshaft 4.

Reference numeral 6 designates a connecting rod whose one end is loosely fitted onto the eccentric shaft 4a of the crankshaft 4, 7 a piston connected to the other end of the connecting rod 6, and 8 housing the piston 7 so that it can freely reciprocate. It is a cylinder.
9 is a cylinder chamber formed by the reciprocating movement of the piston.

The operation of the compressor configured as above will be explained below.

The crankshaft 4 is rotated by the drive of the electric element 3, and a connecting rod 6 whose one end is loosely fitted onto the eccentric shaft 4a of the crankshaft 4 and a piston 7 connected to the other end of the connecting rod 6 are interlocked. and cylinder 8
The piston 7 reciprocates inside. Then, the refrigerant gas sucked into the cylinder chamber 9 is compressed.

Problems to be Solved by the Invention However, in the above configuration, the eccentric shaft 4a of the crankshaft 4 is caused by the pressure of the refrigerant gas compressed in the cylinder chamber 9 to cause the piston 7 and connecting rod 6 to
receives a large force in the counter-compression direction through the Furthermore, the main shaft 4b of the crankshaft 4 is also subjected to a large force. Therefore, if the parallelism of the eccentric shaft 4a and the main shaft 4b that support this force is poor, the sliding loss between the loose fitting part of the connecting rod 6 and the bearing 5 will be extremely large, and the efficiency of the compressor will be extremely reduced. However, there was a problem that this led to a decrease in reliability.

In view of the above-mentioned problems, the present invention provides a stable compressor with low sliding loss even if the parallelism between the eccentric axis of the crankshaft and the main axis is somewhat poor.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has a configuration in which the conrod is equipped with a self-aligning rolling bearing.

Function: With the above-described configuration, the eccentric axis of the crankshaft and the deviation in parallelism of the main axis are absorbed by the alignment function of the self-aligning rolling bearing. This significantly reduces the sliding loss between the parts.

Embodiment Hereinafter, a compressor according to an embodiment of the present invention will be described with reference to the drawings. The same parts as before are given the same reference numerals. In FIGS. 1 and 2, 1 is a closed container, 2 is a compression element elastically supported within the closed container 1, 3 is an electric element disposed above the compression element 2, and 3a is a stator; 3b
is the rotor. A crankshaft 4 is fixed to the rotor 3b and has an eccentric shaft 4a and a main shaft 4b.
In FIG. 2, the eccentric shaft 4a is inclined at an angle θ with respect to the main shaft 4b. Reference numeral 5 denotes a bearing that pivotally supports the main shaft 4b of the crankshaft 4. Reference numeral 6 denotes a connecting rod, one end of which is loosely fitted onto the eccentric shaft 4a of the crankshaft 4, and 7 a piston connected to the other end of the connecting rod 6. 6a is a self-aligning rolling bearing lightly press-fitted into one end of the connecting rod 6. 8
is a cylinder in which the piston 7 is housed so as to be able to reciprocate. 9 is a cylinder chamber formed by the reciprocating movement of the piston.

The operation of the compressor configured as above will be explained below.

The crankshaft 4 is rotated by the drive of the electric element 3, and the connecting rod 5 whose one end is loosely fitted to the eccentric shaft of the crankshaft 4 and the piston 6 connected to the other end of the connecting rod 5 are interlocked to move the cylinder. The piston reciprocates within 7. The refrigerant gas sucked into the cylinder chamber 8 is then compressed. Due to the pressure of this compressed gas, the eccentric shaft of the crankshaft 4 is subjected to a large force in the counter-compression direction via the piston 7 and connecting rod 6. At this time, as shown in Figure 2, the main shaft 4
The inclination θ of the eccentric shaft 4a with respect to b is absorbed by the alignment function of the self-aligning rolling bearing 6a, and at the same time, the sliding loss due to the characteristics of the rolling bearing is extremely small. Regardless of the magnitude of the inclination θ between the eccentric axis 4a of the shaft 4a and the main axis 4b,
It always has stable characteristics with low sliding loss.

Effects of the invention As described above, this invention is equipped with a self-aligning rolling bearing in the connecting rod, so that the eccentric axis of the crankshaft and the inclination of the main shaft are adjusted by the alignment function of the self-aligning rolling bearing. This makes it possible to provide a stable compressor that always has the low sliding loss inherent to rolling bearings.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view of a conventional compressor. 1... Airtight container, 2... Compression element, 3... Electric element, 3a... Rotor, 4... Crankshaft, 4a
...Eccentric shaft, 6...Conrod, 6a...Self-aligning rolling bearing.

Claims (1)

[Scope of utility model registration request] An electric element and a compression element elastically supported in a closed container, a crankshaft fixed to a rotor of the electric element, a connecting rod loosely fitted to an eccentric shaft of the crankshaft, and a loose fitting part of the connecting rod. A hermetic electric compressor characterized by being equipped with self-aligning rolling bearings.