JPS61215486A - Exhaust port structure of rotary compressor - Google Patents

Abstract

PURPOSE:To relieve concentration of stress produced at a valve plate during block up of an exhaust valve, to prevent break of the valve plate, and to reduce the production of resistance of an exhaust flow passage, by a method wherein the exhaust valve seat of a rotary compressor forms a flat surface, and chamfering is applied on the edge of a valve hole. CONSTITUTION:A valve plate 12 of an exhaust valve is forced into abut with the opening of an exhaust hole 10 of a rotary compressor, and a valve press 13 is situated thereabove. The valve seat surface of the outlet side of the exhaust hole 10 forms a flat surface, and chamfering 16 is applied on the edge of the exhaust hole 10. As a result, even if a part of the valve plate 12 is engaged with the exhaust hole during block up of the exhaust valve, since chamfering is applied on the edge of the exhaust hole, stress is prevented from being concentrated on the valve plate 12, and the valve plate 12 is inhibited against damage. Further, chamfering of the edge of the exhaust hole also causes reduction of incurring of an exhaust flow passage loss.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotary compressor, and more particularly to a structural improvement of a discharge port opening suitable for improving the reliability and efficiency of a discharge valve.

[Background of the invention]

The known structure of a conventional rotary compressor will be explained with reference to FAS diagrams to FIGS.

1 is an airtight container; 2 is a frame to which an electric motor 3 is attached; the frame is fixedly held within the airtight container 1; 4 is the cylinder, 5
are lower bearings, and these are assembled on the lower side of the frame 2. A crankshaft 6 transmits power from the electric motor 3. When the crankshaft 6 rotates, the roller 6 rotates slidably within the cylinder chamber 14. 8 is a vane whose back part K is pressed by a spring 9 so as to come into contact with the outer peripheral surface of the roller 7. A discharge port 10 is provided in the radial direction of the cylinder chamber 140, that is, on the inner wall of the cylinder chamber 14, and is connected to a discharge valve chamber 11 formed in the wall of the cylinder 4 surrounding the cylinder chamber 14 in parallel with the cylinder chamber 14. It's communicating. 12 is a discharge valve that opens and closes the discharge port 10, and 13 is a valve holder attached over the discharge valve 12, which is curved so as to hold the discharge valve 12 at a predetermined gap near the discharge port 10. 15
is the operating surface of the discharge valve 12 in the discharge valve chamber 11, and the discharge port 1''O opens into this operating surface 15.

At the opening 16 of the discharge port 10 on the discharge valve operating surface 15, the discharge valve 12 deflects by an amount δ at the center 17 of the discharge port 10 as shown in the broken line in FIG. It bends and curves.

However, %T: Discharge valve plate thickness R: Discharge port radius E: Young's modulus of discharge valve material S: Poisson's ratio of discharge valve material P: Differential pressure between discharge pressure and suction pressure Here, in the conventional structure, the discharge valve operating surface Since the opening 16 of the discharge port 10 of No. 15 is edge-shaped, stress concentration occurs at the edge, and there is a risk of damaging the edge and shortening the life of the discharge valve 12. In addition, the edge-shaped opening 16 acts as a weir as a flow path, which causes an increase in flow path resistance on the discharge side.

A conventional structure related to this structure is U.S. Patent No. 5811
There is No. 468.

[Purpose of the invention]

An object of the present invention is to improve the reliability of a discharge port opening and a discharge valve, and to provide a highly efficient and inexpensive rotary compressor with low flow path resistance.

[Summary of the invention]

In other words, the present invention uses a simple process of just making a notch near the discharge port opening on the discharge valve operating surface, thereby preventing stress concentration and damage caused when the discharge valve is closed, and at the same time reducing the flow path resistance on the discharge side. This is a reduction.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. Components with the same reference numerals as those in the conventional example indicate the same components.

The discharge port 10 is provided in the radial direction of the cylinder chamber 140, that is, on the inner wall of the cylinder chamber 14.
The discharge valve chamber 11 is formed in the wall of the cylinder 4 surrounding the cylinder 4 in parallel with the cylinder chamber 14 . 12 is a discharge valve that opens and closes the discharge port 10, and 13 is a valve holder attached over the discharge valve 12, which is curved so as to maintain a predetermined gap with the discharge valve 12 near the discharge port 10. 1
Reference numeral 5 denotes an operating surface of the discharge valve 12 in the discharge valve chamber 11, and the discharge port 10 opens into this operating surface 15, which is formed to have a flat surface. Here, the opening 16iC of the discharge port 10 on the operating surface 15 is rounded or rounded.

According to the above structure, since the discharge port opening 16 of the discharge valve operating surface 15 is chamfered, the impact that occurs when the discharge valve 12 is closed is alleviated, and damage to this part can be prevented. Since the flow path in this portion is also widened by the chamfer, the flow path resistance is reduced.

〔Effect of the invention〕

As described above, according to the present invention, since the discharge port opening on the valve operating surface is chamfered, this part can be prevented from being damaged when the discharge valve is closed, and the flow path resistance on the discharge side can be reduced. Therefore, it is possible to provide a highly reliable and high performance rotary compressor.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a discharge port portion showing one embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a discharge port portion showing another embodiment of the present invention, and FIG. 3 is a conventional example. A longitudinal sectional view of the rotary compressor, Figure 4 is a sectional view taken along the line I-I in Figure 3, and Figure 5
The figure is an enlarged cross-sectional view of a discharge port portion of a conventional example. 10... Discharge port 12... Discharge valve 15... Operating surface of the discharge valve 16... Opening of the discharge port. +, / Jl figure! 5 32nd 3rd mountain% 4 51st!1

Claims (1)

[Claims] A discharge port is formed in the radial direction of the cylinder chamber, and a discharge valve chamber communicating with the discharge port is formed in a wall surrounding the cylinder chamber in parallel with the cylinder chamber, and the discharge port in the discharge valve chamber is formed in a wall surrounding the cylinder chamber. In a rotary compressor where the open discharge valve operating surface has a flat surface,
A discharge port structure for a rotary compressor, characterized in that the discharge port opening of the discharge valve operating surface is chamfered.