JPS62150096A - Closed type rotary compressor - Google Patents

Abstract

PURPOSE:To enhance the efficiency of a compressor, by forming a discharge chamber in a cylinder such that is is defined by flat surface sections and a curved surface section, and by forming a discharge port in one of the flat surface sections so that the sealing abilities of the discharge valve and the discharge port are enhanced. CONSTITUTION:A discharge valve chamber 24 formed in a cylinder 4 is defined by flat surface sections 20, 21 and a curved surface section 22 connecting between the former two. A discharge port 19 is formed in the flat surface section 21 of the discharge valve chamber 24, and a valve 25 for blocking the discharge port 19 and a U-like valve retaining rod 31 are disposed in a valve chamber 24. With this arrangement, the discharge port 29 and a valve 25 are made into contact with each other in a plane, and therefore it is possible to enhance the sealing ability of the valve so that the efficiency of the compressor may be enhanced. Further, the flat surface section 32 of the valve chamber 24 may by located in the vicinity of vane 14, and therefore, the opening position of the discharge port 19 may be located in the vicinity of the vane 14, thereby it is possible to enhance the volumetric efficiency of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hermetic rotary compressor, and particularly to a hermetic rotary compressor suitable for improving the volumetric efficiency of the compressor.

[Background of the invention]

The known structure of a conventional hermetic rotary compressor is shown in Figures 2 and 3.
This will be explained with reference to FIG.

2 is a closed container, 2 is a crankshaft driven by an electric motor 3, 4 is a cylinder with a cylinder chamber 5 concentric with the crankshaft 2 formed on the inner periphery, 6 is a cylinder with an opening of the cylinder chamber 5 closed, and a cylinder in the center. The upper journal 7 of the crankshaft 2
The bearing for pivotally supporting the crankshaft 2 is an upper bearing having a part 8, the bearing 9 closes the opening of the cylinder chamber 5, and the bearing for pivotally supporting the lower journal 10 of the crankshaft 2 in the center part has a part 11. 12 is a roller that is attached to the eccentric portion 13 of the crankshaft 2 in the cylinder chamber 5 and moves eccentrically; 14 is a roller that slides in sliding contact with the outer peripheral surface of the roller 12 in the guide groove 15 of the cylinder 4; 5 is a vane that divides the cylinder chamber 5 into a high pressure chamber 16 and a low pressure chamber 17; 18 is a spring that presses the vane 14 against the outer peripheral surface of the roller 12; 19 is a discharge port provided near the vane in the radial direction of the cylinder chamber 5;
4 are formed in the wall of the cylinder 4 surrounding the cylinder chamber 5 in parallel with the cylinder chamber 5, and the center of the cylinder chamber 5 and the discharge port 19 are connected to two parallel planes 20.
21 and two R planes 22 connecting this parallel plane 20° 21
．． The discharge port 19 communicates with the discharge valve chamber 24 through a discharge valve chamber 23 having an elongated hole shape in cross section. 25
is a discharge boat 19 housed along the inner wall of the discharge valve chamber 24.
The discharge valve chamber 24 is a discharge valve with a U-shaped cross section for opening and closing.
plane 26.2 along two parallel planes 20,2] of the inner wall
7, a curved surface 28 along the anti-vane side R surface 22, and a curved surface 29 bent along the vane side curved surface 23, one end side is fixed to the peripheral wall of the discharge valve chamber 24 with a bolt 30, and the other end side is fixed to the peripheral wall of the discharge valve chamber 24 with a bolt 30. It is attached opposite to the discharge boat 19.

Further, 31 is a valve suppressor that restricts the stroke of the discharge valve 25.

The discharge valve 25 of the conventional hermetic rotary compressor configured as described above is installed along the inner wall of the discharge valve chamber 24, which has an elongated cross section. The shape is bent along the curved surface 23 of the elongated discharge valve chamber, and the curved surface 29 overlaps the part of the discharge valve 25 facing the discharge boat, or the curved surface 29 overlaps the part facing the discharge boat.
A curved surface 29 was supposed to exist near this portion facing the discharge boat, even if the curved surface 29 did not overlap. Therefore, the discharge valve 25
The surface of the part facing the discharge boat deteriorated, and the airtightness between the discharge valve 25 and the discharge boat 19 deteriorated, causing leakage of discharged refrigerant gas from this part, which could lead to a decrease in volumetric efficiency. .

Furthermore, if the discharge bows 1 to 1-9 are opposed to each other within the flat surface 27 of the discharge valve 25 at a position away from the curved surface 29 to improve the flatness of the opposing portion of the discharge boats and thereby increase airtightness, the discharge valve Since the vane side cross section of the chamber 24 is a curved surface 23,
It was necessary to move the discharge boat away from the vane. Therefore, since the angle α between the discharge boat 19 and the vane 14 becomes large, compression ends earlier, leading to a decrease in volumetric efficiency.

An example of a rotary compressor related to this type of rotary compressor is disclosed in Japanese Utility Model Application Laid-Open No. 57-121794.

[Purpose of the invention]

An object of the present invention is to provide a high-performance rotary compressor with good volumetric efficiency.

[Summary of the invention]

In order to achieve this object, the present invention provides a compression chamber and a discharge valve chamber in a cylinder constituting a compression section.1. In a hermetic rotary compressor that includes a curved surface section and a discharge boat provided in the cylinder so as to communicate the compartments, the discharge valve chamber is formed of a flat surface section and a curved surface section, and the discharge boat is connected to the flat surface section. It was formed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

The same reference numerals as those in the conventional example indicate the same parts. Reference numeral 24 denotes a discharge valve chamber.
A cross section of 111&D is formed by one R surface 22 connecting the two parallel planes 20.21 provided on the anti-vane side and one plane 32 connecting the two parallel planes 20.21 provided on the vane side. has been done.

That is, the cross-sectional shape of the discharge valve chamber 24 is concave on the side opposite to the vane and rectangular on the vane side. Also, 25 is a discharge valve chamber 27'
i A discharge valve with a U-shaped cross section for opening and closing the discharge boat 19 that is housed in close contact with the inner wall, and has planes 26 and 27 along two parallel planes 20° 21 of the inner wall of the discharge valve chamber 24.
and a curved surface 28 along one curved surface 22.

Note that the configuration and basic operation of this embodiment other than those described above are the same as those of the conventional rotary compressor shown in FIGS. 2, 3, and 4, so explanations thereof will be omitted.

〔Effect of the invention〕

As described above, according to this embodiment, since the vane side cross section of the discharge valve chamber is rectangular, the discharge boat can be formed on the plane of the discharge valve chamber and at a position close to the vane, so that the discharge boat can be formed at a position opposite to the discharge boat. The flatness of the valve can be improved, and the angle between the discharge boat and the vane can be reduced.

Further, since the discharge valve is closely attached along the inner wall of the discharge valve chamber, the discharge valve does not undulate due to self-excited vibration when the discharge valve is operated.

Moreover, according to the discharge structure of the present invention, the airtightness of the discharge valve and the discharge boat can be improved, and the end of compression can be delayed, so that a closed rotary compressor with good volumetric efficiency can be obtained. Normally, when a rotary compressor has no loss as 100%, it is about 78%, but the rotary compressor according to the present invention can improve this to about 83%.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a valve chamber and a discharge boat showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a conventional hermetic rotary compressor, and FIG. 3 is an A-- A line drawn sectional view,
FIG. 4 is an enlarged cross-sectional view of a conventional valve chamber and discharge boat portion. 20.21...Discharge valve chamber parallel plane, 22...R plane connecting parallel planes 20.21, 25...Discharge valve with U-shaped cross-sectional path, 32... Plane connecting parallel planes 20.21 . $1 (21

Claims (1)

[Claims] In a hermetic rotary compressor, the cylinder constituting the compression section is provided with a compression chamber and a discharge valve chamber, and a discharge port is provided in the cylinder so as to communicate the two chambers, and the discharge valve chamber has a flat part and a curved part. It is formed from
A hermetic rotary compressor, characterized in that the discharge port is formed in the flat part.