JPS62121889A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the noise associated with an ejection flow of the delivery gas from a rotary compressor by making a hole for forming a resonant muffler through a tubular valve chamber for containing a tubular delivery valve. CONSTITUTION:A tubular valve chamber 9 is formed axially in a cylinder 1 of an enclosed rotary compressor while a C-shaped delivery valve 7 is contained in said valve chamber 9. A hole 12 is formed while extending radially outward at a portion opposite from the position formed with the delivery port 11 of said valve chamber 9. Since said hole 12 will function as a resonant muffler to reduce pulsation of the delivery gas ejecting into the valve chamber 9, noise of the rotary compressor can be reduced considerably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary compressor that reduces noise caused by discharged gas.

[Conventional technology]

FIG. 5 is a sectional view showing the main parts of a conventional rotary compressor disclosed in, for example, Japanese Patent Publication No. 51-43204. In the figure, 1 is a cylinder, 2 is a rotating shaft integrally having an eccentric portion 3 that rotates within the cylinder 1, and an electric motor for driving is provided on the upper part of the rotating shaft (not shown). 4 is a rolling piston fitted into the eccentric portion 3, and 5 is a vane, the tip of which is always in contact with the rolling piston under a predetermined pressure by a spring 6. 1 is a discharge valve, 8 is this discharge valve 1
9 is a cylindrical valve chamber,
It houses discharge valve devices such as a discharge valve 1 and a stopper 8. 10 is a refrigerant gas inlet, and 11 is a discharge port, which passes through the center of the cylindrical valve chamber 9 and opens toward the center of the cylindrical cylinder 1.

In the rotary compressor configured as described above, when the electric motor (not shown) is driven, the rotary l11112 rotates, and the rolling piston/4 rotates eccentrically at the same time.

As a result, the refrigerant gas sucked from the suction port IO is compressed, and this compressed gas passes through the discharge port 11, the discharge valve 7, and reaches the cylindrical valve chamber 9, and then directly or through the discharge muffler (silence chamber) into the sealed container. discharged inside.

[Problem that the invention seeks to solve]

The conventional rotary compressor is configured as described above, and the compressed gas discharged from the discharge port 11 through the discharge valve 1 is discharged directly or through the discharge muffler into the closed container, so that the discharge gas There was a problem in that the noise in a specific band caused by the jet stream could not be sufficiently suppressed. In other words, the discharged refrigerant gas is a noise source caused by jet flow, and usually has several characteristic peaks in the frequency band of IKHz to 3KHz. Therefore, even if a discharge muffler is installed, it is difficult to tune the jet noise. This process is time consuming and difficult, and its sound reduction effect is insufficient due to flow path loss, space, etc., and there is a problem in that noise cannot be sufficiently suppressed.

This invention was made to solve these problems, and provides a rotary compressor that has a simple configuration and can sufficiently suppress noise in a specific frequency band caused by a jet of discharged gas. It is something. .

[Means for solving problems]

The rotary compressor of the present invention is provided with a cylindrical valve chamber housing a discharge valve, and a hole communicating with the cylindrical valve chamber to form a resonance shape 77.

[Effect]

A hole adjacent to the cylindrical valve chamber forms a resonant muffler through which the discharge gas passes. At this time, noise caused by the jet of discharged gas is reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Note that parts corresponding to those in FIG. 5 shown as a conventional example will be described with the same reference numerals.

FIG. 1 and FIG. 2 are diagrams showing an embodiment of the present invention,
Each figure shows a cross section and a longitudinal section of the main parts of the compressor.

In these figures, 1 is a cylinder, 2 is a rotating shaft having an eccentric portion 3, and an electric motor (not shown) is connected to the upper part. Reference numeral 4 denotes a rolling piston that rotates eccentrically within the cylinder 1, and 5 is a part housed in a slit (groove) provided in the cylinder 1, the tip of which is constantly pressed against the rolling piston by a spring 6. 7 is a discharge valve, 8 is a stopper,
Reference numeral 9 denotes a cylindrical valve chamber housing discharge valve devices such as the discharge valve 1 and the stopper 8, and the discharge valve 1 also forms a part of the cylindrical shape. Reference numeral 11 indicates a discharge port, and reference numeral 12 indicates a hole provided in the cylindrical valve chamber 9. One end of the cylindrical valve chamber 99A is open, and the other end is closed by a closed container 13. 14.15Fi respectively form a compression port together with the cylinder 1 and the rolling piston 4 and support the rotating shaft 2. A main bearing plate (upper bearing plate) and a sub-bearing plate (lower bearing plate), 16 are formed on the upper part of the main bearing plate 14. This is an inflatable discharge pillow.

The discharge valve 7 and stopper 8 housed in the cylindrical valve chamber 9 are fastened to the cylinder 1 with bolts or the like, and the compression element and electric motor including these are all housed in a closed container 13.

Next, the operation will be explained. When the compressor is operated and the rotating shaft 2 rotates, the rolling piston 4 rotates eccentrically.

As a result, the refrigerant gas completely sucked from the suction port is compressed, and this compressed gas is discharged from the discharge port 11 back through the discharge valve 7 to the cylindrical valve chamber 9vc. At this time, since the hole 12 communicating with the cylindrical valve chamber 9 forms a resonant muffler, it is possible to optically suppress noise in a specific frequency band caused by the jet of discharged gas. That is, (2n+1)/4 (n=o) of the wavelength of the specific frequency band of the noise having the aforementioned peak value.

1.2. ......) length of hole 12.
! l! When set, a resonant muffler having a sound reduction effect is formed in the specific frequency band, and the noise is sufficiently suppressed. Then, the discharged gas whose noise in the specific frequency band has been suppressed is further muffled by the expansion type discharge muffler 16, and then discharged into the closed container 13VC.

FIGS. 3 and 4 are a cross-sectional view and a vertical cross-sectional view showing another embodiment of the present invention. In this embodiment, both ends of a main length 12 forming a resonant muffler are open and communicate with both ends of a cylindrical valve chamber 9.

In this case, (2n+
1)/2 (n=o, 1, 2,...
If the total length of the hole 12 is set so as to correspond to the length of .), it is possible to reduce the noise in the frequency band corresponding to the above-mentioned wavelength. Furthermore, in this embodiment, since the holes 12 forming the resonant cylinder also serve as flow paths for the discharge gas, it is possible to suppress the flow path loss of the discharge gas of the compressor, and the input reduction effect is also achieved. It is something that you have.

〔Effect of the invention〕

As explained above, according to the present invention, since a resonant muffler is formed by providing holes in the cylindrical valve chamber housing the discharge valve device, it is easy to suppress noise in a specific frequency band caused by a jet of discharged gas. This has the effect that it can be sufficiently suppressed with a simple configuration.

[Brief explanation of drawings]

1 and 2 are cross-sectional views and longitudinal cross-sectional views showing one embodiment of the present invention, and FIGS. 3 and 4 are cross-sectional views and longitudinal cross-sectional views showing other embodiments of the present invention. FIG. 5 is a cross-sectional view showing the main parts of a conventional rotary compressor. 7...Discharge valve 9...Cylindrical valve chamber 12...
...Hole Note that the same reference numerals in the figures indicate the same or equivalent parts. q Masuo Oiwa Fig. 1 7 τ0 Exit valve 9: Cylinder 1 [Valve chamber 12: Hole Fig. 2 Fig. 3

Claims (3)

[Claims] (1) A rotary compressor equipped with a cylindrical valve chamber housing a discharge valve, characterized in that a hole communicating with the cylindrical valve chamber and forming a resonant muffler is provided in the cylindrical valve chamber. Rotary compressor. (2) The rotary compression according to claim 1, wherein the hole forming the resonant muffler has a cylindrical shape with one end open on the cylindrical valve chamber side and the other end closed. Machine. (3) The rotary compressor according to claim 1, wherein the hole forming the resonant muffler is open at both ends and communicates with both ends of the cylindrical valve chamber.