JPS6231675Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a compressor.

An example of the hermetic electric compressor shown in FIG. 1, 1 is a hermetic housing, 2 is an electric element consisting of a stator 3 and a rotor 4, and 5 is a crankcase 6, a crankshaft 7, a connecting rod 8, a piston 9, and a cylinder. 10, a valve plate 11, a cylinder head 12, etc., the rotor 4 and the crankshaft 7 are integrally connected.

13 is a cooling gas suction pipe, 14 is a suction pipe, 15
16 is a motor cover, and 16 is a suction passage. Refrigerant gas is sucked into the sealed housing 1 from the suction pipe 10, passes through the suction pipe 14 to the motor cover 15, the air gap between the stator 3 and the rotor 4, and the suction passage 16 to the cylinder. The air enters the suction cavity in the head 12, is sucked into the cylinder 10 via the suction valve provided on the valve plate 11, and is compressed.

On the other hand, the compressed refrigerant gas is delivered to the cylinder head 12 via a discharge valve 17 provided on the valve plate 11.
It is discharged into the discharge cavity 18 in the connecting pipe 1.
The liquid enters the discharge muffler 20 through the discharge pipe 9, passes through the shock loop 21, and is discharged to the outside from the discharge pipe 22.

The above-mentioned discharge cavity 18 has a certain volume, as shown in FIG.
However, the discharge pulsation generated within the discharge cavity 18 causes the discharge valve 17 to
This has the disadvantage of affecting the operation of the compressor, causing valves to close late, and significantly reducing the efficiency of the compressor.

This invention was proposed in view of the above points,
It is characterized by a volume connected to the discharge cavity of the compressor via a connecting pipe, and its purpose is to provide a highly efficient compressor by reducing pulsation within the discharge cavity. be.

Since the present invention is configured as described above,
By appropriately selecting the volume of the above-mentioned volume, the length and cross-sectional area of the connecting pipe, and matching the acoustic characteristics with the main frequency components of the pulsation, the discharge pulsation can be reduced and its influence on the discharge valve can be eliminated. Therefore, the efficiency of the compressor can be improved.

The present invention will be explained below based on one embodiment. In FIG. 3, 18 is a discharge cavity, 19 is a connecting pipe, and 20 is a discharge muffler, and a volume 31 is connected to the discharge cavity 18 through a connecting pipe 30, respectively.

Here, the length of the connecting pipe 30 is l, the cross-sectional area is S,
Let the volume of volume 31 be V, = c/2π √s/
By establishing the relationship vl (l: main frequency of pulsation, C: speed of sound), the pulsation within the discharge cavity 18 is absorbed into the volume 31 and the connecting pipe 30 side, and the discharge pulsation occurring within the discharge cavity is reduced. be able to.

Therefore, the efficiency of the compressor can be increased. Although the above embodiments have been described with reference to two cylinders, it goes without saying that this is not limiting and can be similarly applied to one cylinder or three or more cylinders.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional hermetic electric compressor, Fig. 2 is a modeled view of its discharge cavity, and Fig. 3 is a modeled main part of an embodiment of the present invention. FIG. 18...Discharge cavity, 19...Connecting pipe, 2
0...Discharge muffler, 30...Connecting pipe, 31...Volume.

Claims (1)

[Scope of utility model registration request] A compressor characterized in that a volume is connected to a discharge cavity of the compressor via a connecting pipe.