JPH0328598B2 - - Google Patents

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 refrigeration systems generate large noises due to pressure fluctuations in the refrigerant compressed within the cylinder. For this reason, conventional methods have been used to reduce noise by providing a muffler on a bearing, etc., but this method has had problems such as a decrease in efficiency.

A conventional configuration will be explained with reference to FIG.

In the figure, 1 is a rotary compressor, 2 is a sealed case, and 3 is a stator, which is fixed to the sealed case 2 by shrink fitting. A rotor 4 is connected to a crankshaft 5. 6 is a piston, and 7 is a cylinder. 8 is a bearing on the rotor side, which is welded to the sealed case 2. Reference numeral 9 denotes a bearing at the end of the shaft, and a recess 10 for mounting a valve 10a and a recess 12 communicating with the recess 10 through a small groove 11 are provided on the opposite cylinder surface 9a. 10b is a valve hole. 13 is a bearing 9 and a cup-shaped discharge cover 1
This is a partition plate interposed between the four. This partition plate 13
Accordingly, these recesses 10, recesses 12, and small grooves 11 form valve chambers 10c and expansion chambers 12, respectively.
a, a small passage 11a that communicates the valve chamber 10c and the expansion chamber 12a, and a discharge cover 14 and a partition plate 13;
A discharge chamber 14a is formed by forming a discharge chamber 14a.
Further, the partition plate 13 is provided with a hole 15 at a position corresponding to the concave portion 12, which communicates the expansion chamber 12a with the discharge chamber 14a.

In this configuration, the refrigerant compressed within the cylinder 7 is discharged from the valve hole 10b into the valve chamber 10c. Furthermore, the refrigerant is supplied from the small passage 11a,
It is ejected into the expansion chamber 12a, and is ejected into the discharge chamber 14a from the small hole 15, and the discharge chamber 14 is ejected.
It is released into the sealed case 2 from a. In this way, the refrigerant compressed within the cylinder 7 passes through the expansion chamber 12a before being discharged into the closed case 2 via the discharge chamber 14a. Therefore, cylinder 7
The pressure fluctuation component of the refrigerant generated inside the valve chamber 10
Since the refrigerant is attenuated by the expansion type silencing effect when passing through the expansion chamber 12a, the pressure pulsation component of the refrigerant radiated into the sealed case 2 is reduced, and the compressor noise is reduced.

However, in such a method, the valve chamber 10c
Since pressure loss of the refrigerant occurs in the passage 11a between the expansion chamber 12a and the expansion chamber 12a, there is a problem in that the efficiency of the compressor decreases.

OBJECTS OF THE INVENTION It is an object of the present invention to improve the efficiency of a compressor by using a shape of a muffler provided in a bearing etc. to have a shape that reduces pressure loss and provides a sufficient muffling effect.

Structure of the Invention In order to achieve this object, the present invention provides a concave portion for mounting a valve on the opposite cylinder surface of the bearing, and a partition plate having a hole at a position corresponding to the vicinity of the cylinder valve hole is provided between the bearing and the discharge chamber. By intervening in the recess, an expansion and resonance type muffler is constructed, which reduces the pressure loss that occurs when the refrigerant gas flows through the small passage and the expansion chamber, and also takes into account the silencing effect due to the resonant path effect in the recess. This aims to improve the efficiency of the compressor.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6. Incidentally, 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.

16 is a bearing that supports the crankshaft 5;
A valve 17a is provided on the opposite cylinder surface 16a of the bearing 16.
A linear recess 17 is provided for storing and mounting.
17b is a valve hole. 18 is a partition plate interposed between the bearing 16 and the cup-shaped discharge cover 19. With this partition plate 18, the recess 17 forms a discharge chamber 19a formed by a valve chamber 17c and a discharge cover 19.

Further, the partition plate 18 is provided with a hole 20 corresponding to the vicinity of the valve hole 17b, which communicates the valve chamber 17c with the discharge chamber 19a.

In this configuration, the refrigerant compressed within the cylinder 7 is discharged from the valve hole 17b into the valve chamber 17c. Furthermore, the refrigerant is discharged into the discharge chamber 19a from the hole 20 through the valve chamber 17c, discharged into the discharge chamber 19a, and discharged into the sealed case 2 from the discharge chamber 19a.

Therefore, the pressure fluctuation component of the refrigerant generated within the cylinder 7 is attenuated by the expansion type silencing effect when the refrigerant passes through the valve chamber 17c. Furthermore, since the hole 20 is provided in the vicinity of the valve hole 17b, the resonance type noise reduction effect in the linear direction of the valve chamber 17c appears strongly, so that the pressure fluctuation component is attenuated.

In this way, in addition to the expansion-type silencing effect, a resonance-type silencing effect is obtained, so even though the expansion chamber 12a is not provided, the pressure fluctuation component generated within the cylinder 7 is sufficiently attenuated. The pressure fluctuation component of the refrigerant radiated into the sealed case 2 is reduced, and compression noise is reduced.

Furthermore, since the small passage 11a and the expansion chamber 12a are not present and the hole 20 is located near the valve hole 17b, there is almost no pressure loss and the efficiency of the compressor can be improved.

Effects of the Invention As described above, the present invention has a rotary compressor that houses an electric compression element in a sealed case, a bearing having a recess for mounting a valve formed on a surface opposite to the cylinder, and a bearing having the recess. By comprising a discharge chamber disposed on the surface side, and a partition plate interposed between the bearing and the discharge chamber and having a hole opened corresponding to the vicinity of the valve hole,
The pressure fluctuation component generated in the cylinder that is radiated into the sealed case can be attenuated by the expansion-type silencing effect and the resonance-type silencing effect, and the efficiency of the compressor can be reduced by allowing the refrigerant to pass only through the bulb chamber. By placing the valve holes close to each other, it is possible to prevent pressure loss from occurring and achieve a low noise level with almost no reduction in noise.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional rotary compressor, Figure 2 is a sectional view of a conventional rotary compressor.
The figure is an exploded perspective view showing a bearing, a partition plate, and a discharge cover. FIG. 3 is a sectional view taken along the line -' in FIG. 1. FIG. 4 is a sectional view of a rotary compressor showing an embodiment of the present invention. , Figure 5 shows bearings, partition plates,
FIG. 6 is an exploded perspective view showing the discharge cover, and FIG. 6 is a sectional view taken along the line -' in FIG. 4. 7... Cylinder, 16... Bearing, 17... Recess, 18... Partition plate, 19... Discharge cover, 20
...hole.

Claims (1)

[Claims] 1. A sealed case housing an electric compression element, a bearing having a valve mounting recess formed on the opposite side of the cylinder and a valve hole in the recess, a discharge chamber disposed on the side having the recess, and the bearing. and a partition plate interposed between the discharge chamber and having a hole corresponding to the vicinity of the valve hole.