JPH0639118Y2 - Hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a hermetic compressor incorporated in, for example, a room cooler, and in particular, can prevent resonance of a cover member and suppress noise generation. The compression device.

(Prior Art) Generally, a compressor incorporated in a hermetic compressor includes a main bearing, a sub bearing, and a cylinder. The main bearing 1 has a step portion 2 as shown in FIG. Is formed, and the discharge hole 3 is provided in the step portion 2. A discharge valve 4 and a valve stopper 5 are provided in the step portion 2.

On the other hand, the main bearing 1 is provided with a flat plate 6 (first cover member) that covers the discharge hole 3 to form a first silencing chamber, and a valve cover 7 (second cover member) that surrounds the flat plate 6 and forms a second silencing chamber. It is fixed. Further, an opening 8 is provided in a portion of the flat plate 6 corresponding to the step portion 2 so that the first silencing chamber and the second silencing chamber communicate with each other.

However, in the hermetic compressor in which the compressor of the above type is incorporated, the expansion of the refrigerant gas passing through the opening provided in the middle of the flat plate 6 causes the flat plate 6 as a whole to resonate with the opening and closing of the discharge valve, which is transmitted to the valve cover 7. However, noise is generated.

(Problems to be solved by the invention) As described above, the opening is provided in the flat plate so that the refrigerant gas is allowed to flow from the first silencing chamber to the second silencing chamber. I can't hold back.

Therefore, the present invention eliminates the above-mentioned drawbacks, and an object of the present invention is to provide a hermetic compressor capable of suppressing the generation of noise by providing a flat plate with a specific opening.

[Constitution of device]

(Means for Solving Problems) In a hermetic compressor of the present invention, an electric motor and a compression device directly connected to the electric motor are provided in a hermetic casing, and a step portion is provided on a bearing body of the compression device. In a hermetic compressor in which a plurality of cover members are provided to form a discharge hole in a hermetically sealed compressor, at least a part of the stepped portion is formed so as to be close to the boss portion of the bearing body. To form a first silencing chamber, a gap is formed between the bearing body boss portion insertion hole of the flat cover member and the bearing body boss outer peripheral surface, and the gap is formed between the first silencing chamber and the second silencing chamber. A communication path is provided so that the refrigerant gas discharged into the first silencing chamber is guided to the second silencing chamber along the bearing body boss portion.

(Operation) In the hermetic compressor of the present invention, the refrigerant gas introduced into the first silencing chamber formed by the flat plate cover member through the discharge hole provided in the stepped portion of the bearing body is the bearing of the flat plate member. While expanding the gap formed between the body boss insertion hole and the outer peripheral surface of the bearing body boss along the boss portion of the bearing body, the second
Since the refrigerant gas reaches the muffling chamber, the refrigerant gas passes through the end portion of the flat plate-shaped cover member, and the energy due to expansion is attenuated by the contact with the boss portion, so that resonance of the flat plate-shaped cover member can be suppressed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The same members in FIG. 1 as those in FIG. 3 are designated by the same reference numerals.

FIG. 2 shows a cross-sectional view of a horizontal rotary compressor. In a casing 10, an electric motor 13 having a stator 11 and a rotor 12 and a compression device 15 directly connected to a crankshaft 14 fitted to the rotor 12 of the electric motor 13 are provided. It is provided.

The compression device 15 is configured to have a main bearing 1, a sub bearing 16 and a cylinder 17 located between them, and a roller 18 fitted onto the large diameter portion 14a of the crankshaft 14 and this roller 1
A compression chamber is formed in the cylinder 17 by the cooperative action of the blade 20 elastically contacting the spring 8 via the spring 19.

On the other hand, as shown in FIG. 1, the insertion hole 30 through which the boss portion 1a of the main bearing 1 is inserted, and the insertion hole 30 are inserted in the central portion of the flat plate 6 (first cover member) which covers the discharge hole 3 and forms the first silencing chamber. A half-moon shaped notch 31 is formed so as to be continuous with the hole. The area of the half-moon cutout 31 is set equal to or smaller than the area of the discharge hole 3. The stepped portion 2 provided on the main bearing 1 is formed so that at least a part thereof is close to the boss portion 1a of the main bearing 1, and the notch 31 is formed on the flat plate 6 on the main bearing 1. It is a position corresponding to the step portion 2 when it is fixed.

Then, the refrigerant gas guided from the suction pipe into the cylinder 17 and compressed therein passes through the discharge hole 3 and is guided to the first silencing chamber formed between the step portion and the flat plate 6, from which the flat plate 6 is discharged.
It flows through the half-moon-shaped notch 31 provided in the main bearing 1, flows along the boss portion 1a of the main bearing 1, and is guided to the second muffling chamber formed between the valve cover 7 (second cover member) and the flat plate 6. The refrigerant gas guided to the second muffling chamber does not directly contact the surface of the valve cover, but hits the valve cover 7 after the energy is attenuated by contact with the boss portion, so that the valve cover 7 is prevented from resonating with the refrigerant gas. It will be.

[Effect of device]

As described above, according to the present invention, since the discharge hole and the communication passage are formed at a position close to each other, the compression loss can be reduced, and further, the refrigerant gas guided to the second silencing chamber can have a boss portion. Second after being contacted with and being attenuated in energy
Since it is sent to the muffling chamber, resonance of the flat plate-shaped cover member can be prevented. Therefore, it is possible to suppress generation of noise due to resonance of the flat cover member while reducing pressure loss.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main bearing portion of a hermetic compressor according to the present invention, FIG. 2 is a sectional view of a hermetic compressor, and FIG. 3 is an exploded perspective view of a main bearing portion of a conventional hermetic compressor. Is. 1 ... Main bearing, 2 ... Step portion, 3 ... Discharge hole, 6 ...
Flat plate, 30 ... Insertion hole, 31 ... Notch.

Claims (2)

[Scope of utility model registration request] 1. A hermetically sealed casing comprising an electric motor and a compression device directly connected to the electric motor, wherein a bearing portion of the compression device is provided with a step portion, a discharge hole is formed in the step portion, and a plurality of cover members are provided. In a hermetic compressor having a plurality of stages of muffling chambers, a flat plate shape in which at least a part of the step portion is formed close to a boss portion of the bearing body, and the step portion is covered to form a first muffling chamber. A gap is formed between the bearing body boss insertion hole of the cover member and the bearing body boss outer peripheral surface,
This gap serves as a communication passage between the first silencing chamber and the second silencing chamber,
A hermetic compressor characterized in that a refrigerant gas discharged into a muffling chamber is guided to a second muffling chamber along a bearing body boss portion. 2. A gap formed between the bearing body boss insertion hole of the flat cover member forming the first silencing chamber and the outer peripheral surface of the bearing boss is a notch provided in the flat cover member. The hermetic compressor according to claim 1, wherein the hermetic compressor is formed by: