JPS606094A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce noise from a compressor, by providing such an arrangement that a bearing is formed therein with a valve fitting recess and a recessed part communicated with the recess through a small groove, and a partition plate having a hole corresponding to the recessed part is disposed between a bearing and a discharge chamber. CONSTITUTION:A recess 12 for mounting a valve 12a and a recessed section 14 which is communicated with the recess 12 through a small groove 13 are formed in the surface 11a of a bearing 11 which is opposite to a cylinder. Further, the recess 12, the recessed section 14 and the small groove 13 form, respectively a valve chamber 12a, an expansion chamber 14a and a small passage 13a communicating between the valve chamber 12a and the expansion chamber 14. Further, a partition plate 15 intervening between the bearing 11 and a discharge chamber 10 is formed therein with a hole 16 in the vicinity of the end part of the recessed section 14 which is opposite to the small groove 13a, for communicating between the chamber 14a and a discharge chamber 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in a freezing and refrigeration system.

Conventional Structure and Problems Rotary compressors used in freezing and refrigerating systems generate large noises due to pressure pulsations of refrigerant compressed within the cylinder. To solve this problem, conventional methods have been used to reduce noise by attaching a silencer to the refrigerant flow path inside the sealed case, but the provision of the silencer makes it difficult to downsize the compressor. In addition, there was a problem in that the attached muffler caused resonance and generated further noise. A conventional configuration will be explained with reference to FIG.

In the figure, 1 is a rotary compressor, 2 is a closed case, and 3 is a rotary compressor.
is fixed to the sealed case 2 by a stator through a shrink fit. 4
is a rotor connected to the crankshaft 5. 6
is a piston, and 7 is a cylinder. 8 is a bearing on the rotor side, which is fixed to the sealed case 2 by welding. 9 is a bearing at the end of the shaft, 10 is a discharge chamber, which is constructed by fixing a cup-shaped discharge cover 10a to the bearing 9, and 10' has one end communicated with the discharge chamber 10 and the other end sealed. This is a silencer opened inside the case 2.

In this configuration, the refrigerant gas compressed within the cylinder 7 is discharged into the sealed case 2 through the discharge chamber 10 and the muffler 10'. Therefore, the pressure pulsations of the refrigerant generated in the discharge chamber 10 in the seven rings 7 are reduced in the muffler 10', so that the pressure pulsations in the shell tI'
i.The noise is reduced because it is reduced. However, this method requires a space for installing the silencer 10', which not only hinders the miniaturization of the compressor 1, but also causes the problem that the silencer causes resonance and generates abnormal noise. Ta.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a muffler on a bearing in order to downsize a compressor, and to prevent a resonance phenomenon in the amount of muffling caused by separately providing a muffler.

Structure of the Invention In order to achieve this object, the present invention provides a valve mounting recess and a recess connected to the recess through a small groove on the opposite cylinder surface of the bearing, and a partition plate having a hole corresponding to the recess is attached to the bearing. By interposing it between the compressor and the discharge chamber, an expansion type muffler is constructed and the noise of the compressor is reduced.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6. In order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

Reference numeral 11 denotes a bearing that supports the crankshaft 5, and the bearing 11
The anti-cylinder surface 11a has a recess 12 for mounting the valve 12a and a recess 14 that communicates with the recess 12 through a small groove 13.
is the provision. 12b is a valve hole.

Reference numeral 15 denotes a partition plate interposed between the bearing 11 and the discharge chamber 10, and the partition plate 16 separates these recesses 12. The concave portion 14 and the small groove 13 are separated from the discharge chamber 10. Then, the recessed portion 12. The concave portion 14 and the small groove 13 each form a valve chamber 12a.

A small passage 13a is formed that communicates the expansion chamber 14a and the valve chamber 12c with the chamber 14a. A hole 16 for communicating the chamber 14a and the discharge chamber 10 is provided in the partition plate 16 near the end opposite to the small groove 13 of the concave portion 14.

In this configuration, the refrigerant compressed within the cylinder 7 is discharged from the valve hole 12b into the valve chamber 12c formed by the recess 12 and the partition plate 16. Furthermore, the refrigerant flows through the concave portion 1 through the small passage 13a formed by the small groove 13 and the partition plate.
4 and the partition plate 16 into the expansion chamber 14a,
The liquid is discharged into the discharge chamber 10 through the small hole 16 and discharged from the discharge chamber into the sealed case 2. in this way,
The refrigerant compressed within the cylinder 7 is discharged into a discharge chamber 10.
It passes through the expansion chamber 14a before being discharged into the sealed case 2. Therefore, the pressure pulsation component of the refrigerant generated in the cylinder 7 and in the valve 12a is attenuated by the expansion type silencing effect when the refrigerant passes through the expansion chamber 14a, so that the pressure of the refrigerant radiated into the sealed case 2 is reduced. Pulsation decreases;
Compressor noise is reduced.

Furthermore, by using the bearing 11 and simply adding the partition plate 14, an expansion-type silencing effect can be obtained, which not only makes it possible to downsize the compressor, but also prevents accidents caused by abnormal noise caused by resonance of a separate silencer. be able to.

Effects of the Invention As described above, the present invention has a rotary compressor that houses an electric compression element in a sealed case, and has a recess for installing a valve formed on the opposite side of the cylinder, which is connected to the recess through a small groove. A bearing having a concave portion for an expansion chamber that communicates with the bearing, a discharge chamber disposed on the side having the concave portion, the bearing, and a bearing interposed between the bearing and the discharge chamber and corresponding to the concave portion. By providing a partition plate with open holes, it is possible to attenuate pressure pulsation components generated in the cylinder and valves that are released into the sealed case, and reduce noise without increasing the size of the compressor. It is something that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional rotary compressor, Fig. 2 is a sectional view of a rotary compressor showing an embodiment of the present invention, and Fig. 3 is a sectional view taken along line A-A in Fig. 2. , Figure 4 is the same (B-B
The cross-sectional view taken along line C and FIG. 6 are the same. Figure 6 is a cross-sectional view taken along line D-D in FIG. 5. Discharge cha/bar, 12... recess, 14... river/recess, 13.
...Small groove, 15...Partition plate, 16. Old hole. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 1

Claims (1)

[Claims] a bearing having a recess for an expansion chamber that communicates with the recess through a small groove between the airtight case that houses the electric compression element; a recess for mounting a valve formed on a surface opposite to the cylinder; and a surface having the recess. A rotary compressor comprising: a discharge chamber disposed on the side; and a partition plate interposed between the bearing and the discharge chamber and having a hole corresponding to the recess.