JPH08334095A - Sealed rotary compressor - Google Patents

Abstract

PURPOSE: To enhance a noise eliminating effect by a muffler without enlarging a compressor itself. CONSTITUTION: A motor driven element 3 and a rotary compressing element 5 to be driven by the motor driven element 3 are housed in a sealed vessel 2 of a compressor main body 1. This rotary compressing element 5 is provided with a cylinder 6, both upper and lower bearing members 7 and 8 to form a compression space P by blocking up both upper and lower end surfaces of this cylinder 6 and a piston roller 9 arranged so as to be eccentrically freely rotatable by rotational driving of crankshaft 4 of the motor driven element 3 pivoted by these both upper and lower bearing members 7 and 8. Sucked and compressed refrigerant gas is delivered to the high pressure side through a delivery port 10 by eccentric rotation of this piston roller 9. An expansive chamber 23 of a noise reducing mechanism (a muffler) 20 to communicate with the delivery port 10 is formed in an outer peripheral edge part 6a of the cylinder 6 to form the compression space P together with both upper and lower bearing members 7 and 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor mounted on, for example, an air conditioner or a refrigerator, and particularly, from a compression process to a discharge process of a refrigerant gas generated in a compression chamber of a rotary compression element. By improving the noise reduction mechanism (muffler) that reduces noise due to pressure pulsation,
It is intended to enhance the silencing effect without increasing the size of the compressor itself.

[0002]

2. Description of the Related Art Conventionally, in this type of hermetic rotary compressor, in order to reduce noise due to pressure pulsation from a compression process to a discharge process of refrigerant gas generated in a compression chamber of a rotary compression element, An upper bearing member or a lower bearing member discharges a compressed refrigerant gas discharged through a discharge port from a compression chamber formed by being bent and formed by a cylinder of a compression element and upper and lower bearing members that pivotally support a crank shaft of an electric element. There is a configuration in which the space is introduced into a space formed by a cup fitted to one side and the space is used as an inflatable muffler.

[0003]

However, in the hermetic rotary compressor having such a conventional structure, the noise damping characteristic is determined by the length and size of the muffler chamber, and the lower limit of the damping frequency is the expansion chamber. Since it depends on the length of the compressor, it cannot be designed enough to satisfy these factors, and not only the sound deadening effect is low, but also the compressor itself needs to be enlarged in order to enhance the sound deadening effect. There was a problem.

An object of the present invention is to provide a hermetic rotary compressor capable of enhancing the sound deadening effect of a muffler without increasing the size of the compressor itself.

[0005]

In order to solve the above-mentioned problems, the present invention accommodates an electric element and a rotary compression element driven by the electric element in a closed container, and the rotary compression element is , A cylinder, upper and lower bearing members that close the upper and lower end surfaces of the cylinder and pivotally support the crank shaft of the electric element, and a crank of the electric element in a compression chamber formed by the cylinder and the upper and lower bearing members. Equipped with a piston roller rotatably eccentrically driven by the rotation of the shaft,
In a compression-sealing type rotary compressor in which the refrigerant gas sucked and compressed by the eccentric rotation of the piston roller is discharged to the high pressure side through the discharge port, noise that communicates with the discharge port at the outer peripheral edge of the cylinder. The configuration is such that an expansion chamber of the reduction mechanism is formed.

Further, according to the present invention, an electric element and a rotary compression element driven by the electric element are housed in a closed container, and the rotary compression element closes a cylinder and upper and lower end surfaces of the cylinder. Further, upper and lower bearing members that pivotally support the crankshaft of the electric element, and a piston provided eccentrically and rotatably in a compression chamber formed by the cylinder and the upper and lower bearing members by rotational driving of the crankshaft of the electric element. Equipped with a roller, this piston roller rotates eccentrically
In a compression-sealing type rotary compressor in which compressed refrigerant gas is discharged to a high pressure side through a discharge port, an expansion chamber of a noise reduction mechanism communicating with the discharge port is provided with an outer peripheral edge portion of the cylinder and the upper and lower bearings. It is configured such that it is formed in a space surrounded by a member.

[0007]

That is, according to the present invention, by adopting the above configuration, the expansion chamber of the noise reduction mechanism (muffler) communicating with the discharge port is provided at the outer peripheral edge of the cylinder forming the compression chamber together with the upper and lower bearing members. Since it is formed, it is possible to increase the volume and length of the expansion chamber without increasing the size of the compressor itself, thereby enhancing the silencing effect as compared with the conventional one.

Further, the expansion chamber of the noise reduction mechanism communicating with the discharge port is formed in a space surrounded by the outer peripheral edge of the cylinder and the upper and lower bearing members, thereby enlarging the compressor itself. It is possible to increase the volume and length of the expansion chamber without increasing the sound deadening effect.
The conventional cup is not necessary, the rigidity of the expansion chamber is increased, and the generation of noise due to the vibration of the cup is prevented, so that the sound insulation effect is high.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the overall construction of a hermetic rotary compressor according to the present invention, in which 1 is a compressor body.

In this compressor body 1, an electric element 3 is housed in an upper part of a closed container 2, and a rotary compression element 5 driven by a crankshaft 4 of the electric element 3 is arranged in a lower part thereof.
Is stored.

The rotary compression element 5 closes the round cylinder 6 fixed to the inner peripheral side wall of the closed container 2, the upper and lower end surfaces of the cylinder 6, and pivotally supports the crankshaft 4 of the electric element 3. The upper and lower bearing members 7, 8 and the compression chamber P formed by the cylinder 6 and the upper and lower bearing members 7, 8 are eccentrically rotatable by rotational driving of the crankshaft 4 of the electric element 3. The installed piston roller 9 is provided, the intake gas is compressed by the eccentric rotation of the piston roller 9, and the compressed high-pressure intake gas is opened from the discharge port 10 to the upper bearing member 7 side to the closed container. 2 has a structure in which the liquid is discharged to the high pressure side.

In the figure, 20 is a noise reduction mechanism (muffler), and this noise reduction mechanism 20 is the upper bearing member 7
The space 23 formed between the cup 21 fitted to the upper surface portion 7a of the cylinder 6 and the passage 22 formed in the outer peripheral edge portion 6a of the cylinder 6 serves as an expansion chamber. As shown in FIG. 2, the space 23 extends from the upstream end 23 a communicating with the discharge port 10 to the discharge port 24 of the downstream end 23 b of the cylinder outer peripheral edge portion 6.
It is formed in a range of more than half the circumference of a, which makes it possible to make the expansion chamber 23 larger in volume and length than the conventional one.

3 and 4 show another embodiment of the noise reduction mechanism 20, in which the expansion chamber 23 is provided between the outer peripheral edge portion 6a of the cylinder 6 and the upper and lower bearing members 7, 8. It has a structure formed in a space to be surrounded.

Although the noise reduction mechanism 20 is provided on the upper surface 7a side of the upper bearing member 7 in the above embodiment, it may be provided on the lower surface side of the lower bearing member 8.

[0015]

As is apparent from the above description, according to the present invention, the expansion chamber of the noise reduction mechanism (muffler) communicating with the discharge port is provided at the outer peripheral edge of the cylinder forming the compression chamber together with the upper and lower bearing members. Since it is formed, the volume and the length of the expansion chamber can be increased without increasing the size of the compressor itself, and thereby the sound deadening effect can be enhanced as compared with the conventional one.

Further, in the present invention, the expansion chamber of the noise reduction mechanism communicating with the discharge port is formed in the space surrounded by the outer peripheral edge of the cylinder and the upper and lower bearing members. The volume and length of the expansion chamber can be increased without increasing the size of the device itself, and the sound deadening effect can be enhanced. In addition, since the cup as in the past can be eliminated, the rigidity of the expansion chamber can be increased. As a result, the generation of noise accompanying the vibration of the cup is prevented, and the sound insulation effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a hermetic rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view of the noise reduction mechanism (muffler) taken along the line AA in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the hermetic rotary compressor according to the present invention.

FIG. 4 is a transverse cross-sectional view of the noise reduction mechanism taken along the line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Compressor main body, 2 ... Airtight container, 3 ... Electric element, 4 ... Crank shaft, 5 ... Rotating compression element, 6 ... Cylinder, 7 ... Upper bearing member , 8 ... Lower bearing member, 9 ... Piston roller, 10 ... Discharge port, 20 ... Noise reduction mechanism (muffler), 23 ... Expansion chamber (space), 24 ... Discharge port , P ... Compression chamber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiro Nishikawa 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. An electric element and a rotary compression element driven by the electric element are housed in a closed container, and the rotary compression element closes a cylinder and upper and lower end surfaces of the cylinder, and the electric element. Upper and lower bearing members that pivotally support the crankshaft, and a piston roller that is eccentrically rotatable by a rotational drive of the crankshaft of the electric element in a compression chamber formed by the cylinder and the upper and lower bearing members. In a compression-sealing type rotary compressor in which the refrigerant gas sucked and compressed by the eccentric rotation of the piston roller is discharged to a high pressure side through a discharge port, the outer peripheral edge portion of the cylinder communicates with the discharge port. A hermetic rotary compressor characterized in that an expansion chamber for a noise reduction mechanism is formed. 2. An electric element and a rotary compression element driven by the electric element are housed in a closed container, the rotary compression element closing a cylinder and upper and lower end surfaces of the cylinder and the electric element. Upper and lower bearing members that pivotally support the crankshaft, and a piston roller that is eccentrically rotatable by a rotational drive of the crankshaft of the electric element in a compression chamber formed by the cylinder and the upper and lower bearing members. In the compression-sealing type rotary compressor in which the refrigerant gas sucked and compressed by the eccentric rotation of the piston roller is discharged to the high pressure side through the discharge port, the expansion chamber of the noise reduction mechanism communicating with the discharge port is provided. A hermetic rotary compressor characterized by being formed in a space surrounded and surrounded by an outer peripheral edge portion of the cylinder and the upper and lower bearing members.