JPH06147162A - Closed rotary compressor - Google Patents

Abstract

PURPOSE:To enhance the compression efficiency by forming a discharge hole in a frame for closing the bore of a cylinder by forming a cut-out in the cylinder so as to form a passage for discharging coolant compressed in a high pressure chamber with the discharge hole and the cut-out, by setting the size of the cut-out to be smaller than that of the discharge hole, and by setting the size of the opening end of the cut-out on the bore side to be larger that on the discharge hole side. CONSTITUTION:A roller 7 is eccentrically rotated in a cylinder by means of an eccentric part 6 of a rotary shaft 5 in a motor element 2, and a space defined between the inner peripheral surface of a cylinder 4 and the outer peripheral surface of the roller 7 is partitioned by a vane into a suction chamber and a compression chamber so that gas sucked from a suction port is compressed by eccentric rotation of the roller 7 and is then discharged from a discharge port 16. In this arrangement, a discharge hole 11 is formed in a frame closing a bore 4a in the cylinder 4, and a cut-out 17 is formed in the cylinder 4 so that a passage for discharging coolant compressed by the high pressure chamber is defined by the discharge hole 13 and the cut-out 11. Further, the size of the cut-out 17 is smaller than that of the discharge hole 13, and the opening end of the cut-out on the bore 4a side is larger than that on the discharge hole 13 side.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art First, the basic structure of a conventional hermetic rotary compressor will be described with reference to FIG. FIG. 1 shows the overall structure of a hermetic rotary compressor, in which 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 having a bore 4a inside and a rotating shaft 5
A roller 7 that eccentrically rotates in the cylinder 4 by the eccentric portion 6, an upper frame body 11 and a lower frame body 12 that seal the bore 4a of the cylinder 4, and a vane that slidably engages with the guide groove of the cylinder 4 (not shown). It consists of and. Roller 7 is eccentric part 6
Is loosely fitted to the outer peripheral surface of the cylinder 4, and is eccentrically rotated along the inner peripheral surface of the cylinder 4. Further, the upper frame 11 is provided with a discharge hole 13 communicating with the inside of the cylinder 4, and the cylinder 4 is provided with a suction port (not shown). Next, regarding the operation of the above-mentioned hermetic rotary compressor,
The roller 7 is eccentrically rotated in the cylinder 4 by the eccentric portion 6 of the rotary shaft 5 of the electric element 2, while the space formed between the inner peripheral surface of the cylinder 4 and the outer peripheral surface of the roller 7 is
It is divided into a suction chamber (low pressure) and a compression chamber (high pressure) by a vane that follows and slides, 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 16 through the discharge hole 13, the discharge valve 14, and the discharge muffler 15. In the hermetic rotary compressor having the above-described structure, the diameter of the discharge hole 13 has a large influence on the compression efficiency, the discharge hole having a large diameter has a large re-expansion loss, and the discharge hole having a small diameter has an excessive compression. Increase loss. Therefore, the optimum discharge hole diameter is determined in consideration of these compression losses (reexpansion loss + overcompression loss).

[0003]

However, there is a problem in that there is room to further improve the compression loss to improve the performance.

[0004]

According to the present invention, in order to improve the compression loss and improve the performance, an electric element and a compression element housed in a closed container are provided, and the compression element is an inner side. A cylinder having a bore, a roller that rotates along the inner wall of the cylinder by an eccentric portion of the rotating shaft, a vane that is in contact with the roller and divides the bore of the cylinder into a high pressure chamber and a low pressure chamber, and a bore of the cylinder. A frame for sealing, the frame has a discharge hole, the cylinder has a cutout, and a passage for discharging the refrigerant compressed in the high pressure chamber of the bore is provided with the discharge hole and the cutout. The hermetically sealed rotary compressor is formed so that the cutout is smaller than the discharge hole, and the cutout has a larger opening end on the bore side than on the discharge hole side.

[0005]

As described above, the optimum discharge hole diameter of the hermetic rotary compressor is determined by the relationship between overcompression loss and reexpansion loss. A large discharge hole diameter reduces the overcompression loss, and a small discharge hole diameter reduces the reexpansion loss. Make it smaller. Therefore, the discharge hole and the notch according to the present invention operate as follows. Overcompression loss is reduced by increasing the optimum discharge hole diameter to a diameter that is safe in terms of strength without changing the valve plate thickness. Since the re-expansion loss increases as the discharge hole diameter increases, the re-expansion loss decreases by reducing the width of the notch. If the width of the notch is reduced, the flow of the compressed gas becomes worse. Therefore, the flow of the compressed gas is improved by forming the opening end of the notch larger on the bore side than on the discharge hole side.

[0006]

Embodiments of the hermetic rotary compressor according to the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a vertical sectional front view of a hermetic rotary compressor according to the present invention, FIG. 2 is a sectional plan view showing a cutout portion of a cylinder included in FIG. 1, and FIG. 3A is a sectional view of the cylinder shown in FIG. 3B is a cross-sectional plan view of the cutout portion, FIG. 3B is a cross-sectional front view of FIG.
FIG. 4 is a sectional view taken along the line AA of FIG. FIG. 1 shows the overall configuration of the hermetic rotary compressor, and the basic configuration thereof is the same as that described in the section of the related art.
The description is omitted. In the present invention, in order to improve the compression efficiency in the discharge part, the notch 17 is newly provided in the above-mentioned basic configuration.

The notch 17 will be described in detail below. In order to reduce the over-compression loss, the optimum discharge hole diameter d is increased to a safe diameter without changing the plate thickness of the valve (see FIG. 2). When the inner diameter of the discharge hole is increased, the re-expansion loss is increased. Therefore, the width of the notch 17 is reduced to reduce the loss (the ratio of the inner diameter d of the discharge hole 13 to the width w of the notch 17 is 1: 0.5 to 0.8, see FIG. 3). If the width w of the notch 17 is reduced, the flow of the compressed gas becomes worse. Therefore, the angle of the notch 17 is increased to improve the flow (in the case of single discharge, the ratio of the height h to the depth d is 1: 2.4-2.8, see FIG. 4). By the above, the compression efficiency in the discharge part is improved and the performance is improved.

Next, experimental results showing the action and effect of the present invention will be described below. The experimental conditions are as follows. Evaporation temperature 7.2 ° C Condensation temperature 54.4 ° C Ambient temperature 35.0 ° C The experimental results in this case are as follows, and it was confirmed that the present invention is superior to the conventional one. Refrigeration capacity input EER Kcal / h W Kcal / h The present invention 4678 1686 2.77 Conventional 4638 1720 2.70 From the results of this experiment, the following features of the present invention are considered. The refrigerating capacity was improved by reducing the notches to reduce the amount of residual refrigerant. The input was reduced because the refrigerant could easily flow from the cylinder bore into the notch.

[0009]

Since the hermetic rotary compressor according to the present invention is constructed as described above, it has the following effects. By forming the cutout smaller than the discharge hole, it is possible to reduce the amount of compressed refrigerant remaining in the cutout and prevent a reduction in the refrigerating capacity. By making the opening end of the notch on the bore side larger than the discharge port side, the compressed refrigerant can easily flow from the high pressure chamber to the notch, and an increase in the input during the discharge stroke can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of a hermetic rotary compressor according to the present invention.

FIG. 2 is a cross-sectional plan view showing a cutout portion of the cylinder included in FIG.

3A and 3B show a notch portion of the cylinder shown in FIG. 2, where FIG. 3A is a sectional plan view and FIG. 3B is a sectional front view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Airtight Container 2 Electric Element 3 Compression Element 4 Cylinder 5 Rotating Shaft 6 Eccentric Part 7 Roller 11 Upper Frame 12 Lower Frame 13 Discharge Hole 14 Discharge Valve 15 Discharge Muffler 16 Discharge Port 17 Notch

Claims (1)

[Claims] 1. A cylinder provided with an electric element and a compression element housed in a closed container, the compression element having a bore inside, and a roller rotating along an inner wall of the cylinder by an eccentric portion of a rotation shaft. A vane that contacts the roller and divides the bore of the cylinder into a high-pressure chamber and a low-pressure chamber, and a frame that seals the bore of the cylinder.The frame has a discharge hole and the cylinder has a notch. A hermetic rotary compressor in which a passage for discharging the refrigerant compressed in the high pressure chamber of the bore is formed by the discharge hole and the cutout, the cutout being smaller than the discharge hole. The hermetically sealed rotary compressor is characterized in that the cutout is formed such that the opening end on the bore side is larger than the discharge hole side.