JPS61268898A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To obtain wide silencing effect through additional action of resonant type silencing effect of a discharging chamber by providing a bearing having a hole communicating both faces of cylinder side and counter cylinder side with each other and a cylinder having a hole communicating to the hole of the bearing. CONSTITUTION:Coolant compressed in a cylinder 13 is discharged into a discharging chamber 10a from a valve hole 19, and discharged furthermore from the discharging hole 10b of a discharging cover 10 into the space in a sealed case. The pressure pulsation of the coolant generated in the cylinder 13 is damped by silencing effect of the discharging chamber 10a. This time, the discharging chamber 10a is communicated to a bearing 12 and a chamber 18 provided in the cylinder 13, and the chamber 18 acts as a side branch type silencer against the pressure pulsation in the discharging chamber 10a. Therefore, wide silencing effect can be obtained by setting the frequency silenced of the chamber 18 to the center of frequency region not damped by the discharging chamber 10a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment and the like.

BACKGROUND OF THE INVENTION In recent years, compressors used in refrigeration systems have been shifting from reciprocating types to rotary types from the standpoint of energy and space savings. In these rotary compressors, the inside of the sealed case is usually the high-pressure side, and the refrigerant compressed in the cylinder is once discharged into the space within the shell before being discharged from the compressor into the refrigeration system.

As a result, the pressure pulsation component of the refrigerant generated by the refrigerant being compressed in the cylinder is transmitted to the shell interior space with almost no attenuation, causing air column resonance in the shell interior space, which further causes the shell to vibrate and cause a large Generates noise.

Therefore, a method has conventionally been adopted in which a discharge chamber is provided immediately after the cylinder internal peripheral medium is discharged from the cylinder to attenuate pressure pulsations.

An example of the conventional rotary compressor mentioned above will be described below with reference to the drawings.

4 and 6 show an example of a conventional rotary compressor.

In the figure, 1 is a rotary compressor, 2 is a closed case, and 3 is a rotary compressor.
is fixed to the sealed case 2 with a stator. 4
is connected to the crankshaft 6 by a rotor. 6 is a rotary type piston, and 7 is a cylinder. 8 is a bearing on the rotor side, which is fixed to the sealed case 2 by welding. 9 is a bearing at the end of the shaft, and 9a is a valve (not shown)
It is a recessed part for attaching. Reference numeral 10a denotes a discharge chamber, which is constructed by fixing a cup-shaped discharge cover 10 to a bearing 9. The discharge cover 10 has a discharge chamber 1
A discharge hole 1ob that communicates with the space 11 in the sealed case
is provided.

The operation of the rotary compressor configured as above will be described below.

The refrigerant gas compressed in the cylinder 7 is discharged into the discharge chamber 1
0a, and is further discharged into the sealed case internal space 11 from a discharge hole 1ob provided in the discharge cover 10. Therefore, since the discharge chamber pulsation component is attenuated, the pressure pulsation component of the refrigerant discharged into the closed case internal space 11 is reduced, and the generation of noise can be reduced.

Problems to be Solved by the Invention However, in the above-described configuration, the discharge chamber 10a mainly acts as an expansion type muffler, and therefore a frequency range (hereinafter referred to as a non-attenuation range) in which there is almost no muffling effect occurs. Although these non-damped regions have relatively narrow frequency bands, if the frequency of the air column resonance occurring in the sealed case interior space 11 matches the frequency band of these non-damped regions, large noise will be generated. The noise reduction effect of the chamber 10 & will be very small.

In view of the above-mentioned problems, the present invention provides an extremely effective noise reduction effect without reducing the efficiency of the compressor or substantially impairing the compactness of the compressor.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention includes a bearing having a hole at a position outside the inner circumference of the cylinder that communicates the cylinder side surface and the opposite cylinder side surface. and the cylinder provided with a hole communicating with the hole provided in the bearing,
The discharge cover is disposed on the surface of the bearing opposite to the cylinder, and forms a discharge chamber with the bearing that communicates with the hole.

Operation The present invention achieves an extremely wide silencing effect by applying a resonant silencing effect to a frequency band in which the silencing effect of the discharge chamber is not attenuated by the above-described configuration.

EXAMPLE Hereinafter, a rotary compressor according to an example of the present invention will be described with reference to the drawings. Incidentally, in order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals, and detailed explanation thereof will be omitted.

1 to 3 show an embodiment of a rotary compressor of the present invention. In the figure, 12 is a bearing at the end of the shaft, and 13 is a cylinder.

A valve 14 is provided on the opposite cylinder surface 12a of the bearing 12.
A recessed portion 16 is provided for mounting the.

Further, a hole 17 is provided at a position outside the cylinder inner circumference 13a of the bearing 12 to communicate the opposite cylinder surface 12a and the surface 12b on the cylinder 13 side, and to communicate the hole 16 provided in the cylinder 13 with the discharge chamber 10a. ing. The opening 16a of the hole 16 on the side of the non-axial bone 12 is sealed by the bearing 8, and the L holes 16 and 17 form a chamber 18 with one end open.

19 is a valve hole.

The operation of the rotary compressor configured as described above will be explained below with reference to FIGS. 1 to 3.

The refrigerant compressed within the cylinder 7 is discharged from the pulp hole 19 into the discharge chamber 10a, and further discharged from the discharge hole 10b provided in the discharge cover 10 into the sealed case interior space 11.

In this process, the pressure pulsations of the refrigerant generated within the cylinder 13 are attenuated by the silencing effect of the discharge chamber 10 &, and most of the refrigerant is attenuated when the refrigerant is discharged into the space 11 inside the sealed case 2. Since the silencing effect of the discharge chamber 10a is mainly an expansion-type silencing effect, there is a non-attenuation region, and pressure pulsation components are hardly attenuated in that frequency band.

However, the discharge chamber 10a has a bearing 12 and a cylinder 1.
The chamber 18 communicates with a chamber 18 provided in the discharge chamber 10a, and since the chamber 18 acts as a side branch type muffler against pressure pulsations in the discharge chamber 10a, part of the pressure pulsations in the discharge chamber 10a are It is attenuated by the silencing effect. Furthermore, this chamber 18 not only contains the bearing 12 but also the cylinder 13.
Since the length of the chamber 18 is longer than that of a chamber provided only in the bearing 12, and the cutoff frequency is lower, pressure pulsations in the low-order undamped region of the discharge chamber are damped. Therefore, the silencing effect of the discharge chamber in this area becomes extremely effective.

In this embodiment, since the cutoff frequency of the chamber 18 is set to the center frequency of the non-damped region of the discharge chamber 10a, the hole 16
is a through-hole, but if the center frequency of the non-attenuated region intended for noise reduction is higher than this case, it is not necessary to make the hole 16 a through-hole.

As described above, according to this embodiment, the surface 12b on the cylinder 13 side is provided at a position outside the cylinder inner circumference 13a of the bearing 12.
A hole 17 communicating with the opposite cylinder surface 12a is provided, a hole communicating with the hole 17 is provided in the cylinder 13, and the bearing 1
By providing a discharge cover that forms a discharge chamber 10a that is disposed on the surface 12a on the opposite cylinder side of the cylinder 2 and communicates with the hole 17 with this bearing, the compressor can be made more compact without impairing compressor efficiency. A wide silencing effect can be obtained in a relatively low frequency range without sacrificing performance, and compressor noise can be effectively reduced.

Effects of the Invention As described above, the present invention provides a rotary compressor in which an electric compression element is housed in a sealed case, in which a surface on the cylinder side and a surface on the opposite cylinder side communicate with each other at a position outside the inner circumference of the cylinder. a bearing having a hole; a cylinder having a hole communicating with the hole provided in the bearing; and a discharge chamber disposed on a surface of the bearing opposite to the cylinder and communicating with the hole through the bearing. By providing a discharge cover that forms a compressor, a wide silencing effect can be obtained in a relatively low frequency range without impairing compressor efficiency or compactness, effectively reducing compressor noise. It is something.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the discharge cover, bearing, and cylinder of a rotating compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view showing the discharge cover, bearing, and cylinder portion of the same compressor.
FIG. 3 is a sectional view of the same compressor, FIG. 4 is an exploded perspective view showing the discharge cup and bearing of a conventional rotary compressor, and FIG. 6 is a sectional view of the same compressor. 8...Bearing, 10...Discharge cup 1
10a...Discharge chamber, 12...
Bearing, 13... cylinder, 16... hole, 17... hole. Name of agent: Patent attorney Toshio Nakao and one other person
---aL Seven Swords Bar- 12-11 Axis Burning 13-11 Linta. Fig. 1 16- 4shit'l--1 denial g---m\ g-11 axis father 17--- Hole!

Claims (1)

[Claims] A sealed case housing an electric compression element, a bearing having a hole located outside the inner periphery of the cylinder that communicates between a surface on the cylinder side and a surface opposite to the cylinder, and the bearing communicates with the hole provided in the bearing. A rotary compressor comprising: the cylinder provided with a hole; and a discharge cover disposed on a surface of the bearing opposite to the cylinder and forming a discharge chamber communicating with the hole with the bearing.