JPH05133364A - Closed type compressor - Google Patents

Abstract

PURPOSE:To improve refrigerating power by arranging a hollow in the high pressure chamber side of a vane, and connecting this hollow to a high pressure chamber in a cylinder in the specific angle range of a compression stroke, so that a pressure wave generated in the cylinder is absorbed to reduce noise and also to prevent reexpansion of gas. CONSTITUTION:In a compressor, a roller 7 is eccentrically rotated in a cylinder 14 by an eccentric part 6 of a rotary shaft 5. Here, space formed between the cylinder 4 and the roller 7 is divided into suction and compression chambers 18, 19 by a vane 8 sliding by following the roller 7. Suction gas is compressed by the roller 7 and delivered via a delivery port 14 or the like. In the above constitution, a hollow 9, comprising a semispherical hollow 9a and a small hole 9b connected to this hollow 9a in a right angle direction to the lower surface, is arranged in the vicinity of a crossing line between a side surface in a side of the compression chamber 19 of the vane 8 and the lower surface. The hollow 9 is connected to the compression chamber 19 in the range of a compression stroke angle from 90 deg. to 270 deg. with the vane 8 serving as the reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly to a hermetic rotary compressor mounted on all refrigeration and air conditioning equipment.

[0002]

2. Description of the Related Art Conventionally, as a noise reducing method for a rotary compressor, there are a silencer which covers the outlet of a discharge valve, a silencer which is attached to a discharge pipe, and the like. It is known to attenuate the jet noise of gas to reduce the noise. Further, as a noise reduction measure due to pressure pulsation of a high frequency component of 1000 to 2000 Hz in the cylinder in the region from the compression process to the discharge process in the pressure pulsation component generated in the cylinder, a resonance type muffler is provided immediately before the discharge. Therefore, there is a device that attenuates a pressure wave having a high frequency component to reduce noise (Japanese Patent Publication No. 62-
No. 11200).

[0003]

However, as described above, the silencer provided at the outlet of the discharge valve or attached to the discharge pipe requires a silencer separately, and
The one described in Japanese Patent Publication No. 62-11200 requires a small volume space to some extent on either or both of the end surface of the cylinder and the contact surface of the end plate of the frame body in order to damp the pressure pulsation. There is a problem that the gas in the volume space becomes residual gas after compression and re-expands to the low pressure chamber side, deteriorating the refrigerating capacity.

[0004]

According to the present invention, as described above, in order to reduce the noise by attenuating the pressure pulsation of the high frequency component generated during compression in the cylinder, and to prevent the performance from being impaired, a closed container is used. And a compression element housed in the closed container, the compression element includes a cylinder, and a roller that rotates in the cylinder by an eccentric portion of a rotation shaft.
A vane that is in contact with the roller and slides in a guide groove provided in the cylinder to partition the interior of the cylinder into a high-pressure chamber and a low-pressure chamber; and a frame body that seals the opening of the cylinder,
In a hermetic compressor in which a discharge port communicating with the inside of the cylinder is provided in a frame body composed of an upper frame body and a lower frame body, a recess is provided on the high pressure chamber side of the vane, and the recess is a compression stroke. The angle is 90 ° to 2 with reference to the vane.
It is an object of the present invention to provide a hermetic compressor which is adapted to communicate with the high pressure chamber in the cylinder when in the range of 70 °.

[0005]

The above-mentioned means absorbs the pressure pulsation of the refrigerant having the high frequency component generated in the region from the compression stroke to the discharge stroke in the cylinder mainly by the muffler effect of the depression in the intermediate stroke to reduce the noise. In the stroke, the pressure of the residual gas remaining inside the recess is not so high, and when the compression is started, the recess is hidden in the cylinder, so the gas in the recess does not flow back into the suction chamber and re-expansion loss does not occur You can improve your ability.

[0006]

Embodiments of the hermetic compressor according to the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 is a vertical sectional front view of a hermetic compressor incorporating a first embodiment of a vane,
2 is an AA cross-sectional plan view of FIG. 1, FIGS. 3 to 6 are enlarged plan views and front views of the vanes, and FIGS. 7 and 8 are enlarged explanatory views showing the relative positions of the vanes and the rollers. 1 and 2 show the overall configuration of a hermetic compressor, 1 is a hermetic container, and an electric element 2 and a compression element 3 are housed in the hermetic container 1. The compression element 3 includes a cylinder 4, a roller 7 that is eccentrically rotated in the cylinder 4 by the eccentric portion 6 of the rotary shaft 5, an upper frame body 12 and a lower frame body 13 that seal the opening of the cylinder 4, and the cylinder 4. The guide groove 10 and the vane 8 are slidably engaged with the guide groove 10. The roller 7 is loosely fitted to the outer peripheral surface of the eccentric portion 6, and
It is designed to rotate eccentrically along the inner peripheral surface of the. or,
The upper frame 12 has a discharge port 14 communicating with the inside of the cylinder 4.
The vane 8 slidably engaged with the guide groove 10 of the cylinder 4 is pushed by the spring 11 and constantly contacts the roller 7, and the cylinder 4 is provided with a suction port (not shown). There is.

Next, the operation of the hermetic compressor will be described. The roller 7 is driven by the eccentric portion 6 of the rotary shaft 5 of the electric element 2.
Eccentrically rotates in the cylinder 4, while the space formed between the inner peripheral surface of the cylinder 4 and the outer peripheral surface of the roller 7 is a suction chamber (low pressure) by the vane 8 that slides following the roller 7. It is partitioned into a compression chamber 18 and a compression chamber (high pressure) 19, and the gas sucked from the suction port is compressed by the eccentric rotation of the roller 7. The compressed gas is discharged from the discharge port 17 through the discharge port 14, the discharge valve 15, and the discharge muffler 16.

In the present invention, the vane is improved, and the vane will be described in detail below. Figure 3
3A and 3B respectively show a vane 8 according to the present invention.
2A and 2B are a plan view and a front view of the first embodiment, showing a hemispherical notch-shaped recess 9a near the intersection of the side surface of the vane on the compression chamber 19 side (see FIG. 2) and the lower surface, and this recess 9a. A recess 9 is formed on the lower surface and communicates with the small hole 9b in the direction perpendicular to the lower surface at a position described below. That is, when the compression stroke angle α is 90 ° (see FIG. 7) with respect to the vane 8, the recess 9 starts communicating with the compression chamber 19, and when the angle α is 270 ° (see FIG. 8), the communication is terminated. It is hidden in the cylinder 4.

In FIG. 4, the recess 9 is provided in the vicinity of the line of intersection between the side surface of the vane on the side of the compression chamber and the upper surface, and in FIG. 5, the small hole 9b of FIG. 4 is provided obliquely. The example provided in the side surface of this is shown.

[0010]

In the hermetic compressor according to the present invention, the vane is provided with the recess so as to communicate with the compression chamber at the intermediate position of the compression stroke, and absorbs the pressure wave generated inside the cylinder to reduce noise. Therefore, it is not necessary to dispose a silencer at the outlet of the discharge valve or attach it to the discharge pipe.Since the muffler action of the recess is performed in the middle of the compression stroke, the pressure of the gas remaining inside the recess is also high. However, since the recess is hidden in the cylinder at the start of compression, the refrigeration capacity can be improved without re-expansion of gas.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a hermetic compressor according to the present invention incorporating a first embodiment of a vane.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 (A) is a plan view of the first embodiment of the vane, (B).
Is a front view.

FIG. 4A is a plan view of the second embodiment of the vane, FIG.
Is a front view.

5A is a plan view of a third embodiment of a vane, FIG. 5B
Is a front view.

FIG. 6A is a plan view of a vane according to a fourth embodiment, and FIG.
Is a front view.

FIG. 7 is an enlarged explanatory view showing a relational position between a vane and a roller when a compression stroke angle is 90 °.

FIG. 8 is an enlarged explanatory view showing a relationship position between a vane and a roller when a compression stroke angle is 270 °.

[Explanation of symbols]

 1 Airtight Container 2 Electric Element 3 Compression Element 4 Cylinder 5 Rotating Shaft 6 Eccentric Part 7 Roller 8 Vanes 9 Recess 10 Guide Groove 12 Upper Frame 13 Lower Frame 14 Discharge Port 18 Suction Chamber (Low Pressure) 19 Compression Chamber (High Pressure)

Claims (1)

[Claims] 1. A hermetically sealed container and a compression element housed in the hermetically sealed container, wherein the compression element includes a cylinder, and a roller that rotates in the cylinder by an eccentric portion of a rotary shaft.
A vane that is in contact with the roller and slides in a guide groove provided in the cylinder to partition the inside of the cylinder into a high pressure chamber and a low pressure chamber; and a frame body that seals the opening of the cylinder. In the hermetic compressor provided with a discharge port communicating with the inside of the cylinder, a depression is provided on the high pressure chamber side of the vane, and the depression has a compression stroke angle of 90 ° to 270 with respect to the vane. A hermetic compressor characterized in that it communicates with a high pressure chamber in the cylinder within a range of up to °.