JPS59145387A - Sliding vane type rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the intensity of generated shock waves for aiming at reducing pulsation in a compression chamber, by forming, in the inner wall of a cylinder in the direction of the rotor reversing from a discharge port, a slight spill groove which is contiguous to the discharge port so that the high pressure gas section is gradually communicated with a low pressure chamber. CONSTITUTION:High pressure gas compressed in a high pressure chamber 6b is discharged therefrom through a discharge valve 7 which is opened when the high pressure exceeds its discharge pressure. During this compressing step, when each vane 3 passes through in the vicinity of a discharge port 7, the high pressure gas section in the vicinity of the space 11 in the discharge port 7 is gradually communicated with the low pressure chamber 5a by such an effect of a spill groove 8, formed in the inner wall of a cylinder 1, that a slight communication is established between the high pressure gas section in the vicinity of a space 11 within the discharge port 7 and a low pressure chamber 5a in a period from the timing which is an earlier crank angle position from the discharge port 7 to the timing at which each vane 3 advances, and therefore, the intensity of a generated shock waves is decreased. As a result, the level of noise due to the shock waves may be greatly reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to noise reduction in a sliding vane rotary compressor.

In general, sliding vane rotary compressors are
The compression operation is performed the same number of times as the number of vanes per revolution of the rotor, but when the rotation speed is high and the compression ratio is high, during this compression operation process, when the vanes pass through the discharge port, the discharge is The high-pressure gas near the oral cavity and the low-pressure gas in the low-pressure chamber of the cylinder communicate in an instant, and a shock wave is generated in the low-pressure chamber, similar to when the diaphragm separating the high-pressure side and low-pressure side of a shock wave tube suddenly ruptures. The pressure pulsations cause compressor components such as the cylinder and rotor to vibrate, which causes the noise level to increase rapidly.

Therefore, this invention has been made to solve the above problem, and has a surface area on the inner wall surface of the cylinder interior space from the crank angle position earlier than the vane passing through the discharge port to the time when the vane reaches the discharge port. By providing a groove that slightly communicates the high-pressure gas section and the low-pressure chamber at the crank angle, the high-pressure gas section and the low-pressure chamber are gradually communicated with each other, thereby reducing the strength of the generated shock wave. The pulsation of the pressure in the room is reduced by /J%. Hereinafter, a sliding vane type rotary compressor according to the present invention will be explained in detail using the drawings.

FIG. 1 is a sectional view of main parts showing one embodiment of a sliding vane rotary compressor according to the present invention, and FIG.
The figure is an internal view seen from arrow A.

In the same figure, l is a cylinder with a circular hollow inside, and 2 is a cylinder that is partially in contact with the inner wall of the cylinder l, and is eccentric from the center of the cylinder l, and is driven by a rotary drive machine such as an electric motor or an engine. A rotating rotor 3 includes two vanes 5 that slide back and forth in two vane grooves 4 provided in the rotor 2 while contacting the inner periphery of the cylinder 1.
is a compression chamber formed by the inner wall of the cylinder 1, the outer wall of the rotor 2, and the vane 3, and for convenience of explanation,
5o is called a low pressure chamber, and 5b is called a high pressure chamber. 6 is a suction port for guiding gas to the compression chamber 5, and 7 is a discharge port for discharging the compressed gas to the outside of the cylinder l. Reference numeral 8 denotes a K relief groove provided on the inner wall of the cylinder l in a direction opposite to the rotation direction of the rotor l from the discharge lower. Reference numeral 9 denotes a discharge valve provided with pressure on the outlet side of the discharge lower for partitioning the inside and outside of the cylinder 1. Although not shown in FIG. 1, two bearing plates that close both sides of the compression chamber 5 and also serve as bearings for the rotating shaft lO integrated with the rotor 2 are naturally provided. Further, FIG. 2 is a front view of the dipping groove 8 shown in FIG. 1.

In the sliding vane rotary compressor configured as described above, the gas flowing into the low pressure chamber 5a from the suction port 6 is gradually compressed as the rotor 2 rotates, and becomes a high pressure gas. When the high pressure gas compressed in the high pressure chamber 5b reaches a discharge pressure or higher, the discharge valve 9 opens, and the gas is discharged from the high pressure chamber 5b through the discharge lower.

In this compression process, when the vane 3 passes near the discharge lower, the high-pressure gas part near the inner space 11 of the discharge port is slightly communicated with the low-pressure chamber 5a from a timing earlier in crank angle than the discharge port until reaching the discharge lower. Due to the effect of the bittering groove 8, the high-pressure gas part near the internal space 11 of the discharge port gradually communicates with the low-pressure chamber 5a, similar to when the diaphragm of a shock wave tube is slowly ruptured. This reduces the strength of the generated shock wave. As a result, it becomes possible to significantly reduce the noise level under operating conditions where conventional products generate large noise due to shock waves.

FIG. 3 is a sectional view of a main part showing another embodiment according to the present invention, and the same parts as in FIG. 1 are indicated using the same symbols. Fig. 3 shows an elliptical cylinder type in which the internal shape of the cylinder l is oval, the outer diameter of the rotor 2 is approximately the same as the short axis of the oval cylinder l, and the center of rotation is the center of the cylinder l. This is a case in which a sliding vane type rotary compressor is provided with the same bridging grooves 8 as in the previous embodiment, and in this case as well, the same effects as in the case of FIG. 1 can be obtained.

In addition, in the above explanation, the number of vanes 3 is 2 (
Although the case has been described in which the elliptical cylinder type has four cylinders, substantially the same effect can be obtained with one or more cylinders (two or more cylinders in the elliptical cylinder type). Furthermore, in the above explanation, the case where the stripping grooves 8 were provided in each of the four discharge lowers provided on the inner wall of the cylinder 1 was explained.
Even if one discharge core is provided on a bearing plate, or if the washout grooves 8 of each discharge lower are connected and integrated, substantially the same effect can be obtained.

[Brief Description of the Drawings] Fig. 1 is a cross-sectional view of essential parts showing an embodiment of a sliding type rotary compressor according to the present invention, and Fig. 2 shows a peeling groove inside the cylinder in the direction indicated by the arrow in Fig. 1. View from 3rd
The figure is a sectional view of main parts showing another embodiment according to the present invention.
This figure is a view of the peeling groove inside the cylinder as seen from the direction of arrow A in FIG. 3. l...Cylinder, 2...Rotor, 3
...Vane, 5...Compression chamber, 7...
...Discharge port, 8...Nigari groove, 9...
・Discharge valve. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Nobu Tameno - (1 other person)

Claims (1)

[Claims] (1) A circular rotor rotates eccentrically from the center of the cylinder while contacting a part of the inner wall of a circular cylinder, and a rotor slides back and forth through multiple vane grooves provided on the rotor while contacting the inner circumference of the cylinder. a vane that moves; two bearing plates that respectively close both end faces of the cylinder to form a space within the cylinder; and at least one of the cylinder and the two bearing plates for causing gas to flow into the cylinder. a suction port provided at a location, a discharge port provided at at least one location of the cylinder and two bearing plates for causing gas compressed in the cylinder to flow out of the cylinder, and an outlet side of the discharge port. In a sliding vane type rotary compressor equipped with a discharge valve that partitions the inside and outside of the cylinder provided in A sliding vane type rotary compressor, characterized in that a slight groove is provided in at least one place on the inner wall of the rotary compressor.