JPS5830143Y2 - Compressor pressure equalization device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a compressor used in refrigeration equipment, etc., and particularly relates to a pressure equalization device thereof.

A conventional device of this type is shown in Fig. 1, in which a pressure equalizing hole 1 that communicates a gas suction passage 2 and a crank chamber 3 is provided in the upper part of the crank chamber 3, and the piston and cylinder are connected to each other. Gas leaking into the crank chamber 3 from the sliding surface of the engine is returned to the gas suction passage 2 through the pressure equalization hole 1.

By the way, if splash-type lubrication is performed in the crank chamber 3, a large amount of lubricating oil droplets will be distributed in the upper part of the crank chamber 3 during operation due to the action of centrifugal force, resulting in leakage. Oil droplets along with the gas come out into the gas suction passage 2 through the pressure equalization hole 1. Due to this oil rising phenomenon, the crank chamber 3
There is a risk that the amount of internal lubricating oil will be insufficient, causing a seizing accident on the sliding parts.

The present invention is an attempt to solve such problems, and aims to provide a pressure equalization device for a compressor that prevents the above-mentioned oil swell phenomenon from occurring and prevents seizure accidents. .

Therefore, in the compressor pressure equalization device of the present invention, a bearing is installed on the inner surface of a lid member that has a bearing that supports one end of the crankshaft.An annular recess is formed, and a through hole is formed at the open end of the recess. The present invention is characterized in that an annular plate member having an annular shape is attached to form a donut-shaped cavity communicating with the crank chamber, and a pressure equalization passage is provided that communicates the gas suction passage of the compressor with the cavity. .

Hereinafter, a pressure equalizing device for a compressor for refrigeration equipment as an embodiment of the present invention will be explained with reference to the drawings. FIG. A gas suction passage 11 & a crank chamber 12 are formed inside.

A lid member 16 having a bearing 17 that supports one end of the crankshaft 13 is fastened and fixed with a plurality of bolts 15 with a gasket 14 interposed on the joint surface with the crankcase 10.

Further, an annular recess for receiving the bearing is formed on the inner surface of the lid member 16, and an annular plate member 19 is attached to the open end of the recess with screws 20 to form a donut-shaped cavity 18.
is formed.

The cavity 1 sr* is communicated with the crank chamber 12 through an appropriate number of pressure equalization and oil passage holes 21 provided in the annular plate 19 .

Furthermore, a pressure equalization passage 22 is bored in the crankcase 10 and the lid member 16, and the gas suction passage 11 and the cavity 18 are communicated via this pressure equalization passage 22.

A wire mesh or the like can be used as the S i-1 annular plate member 19, and the twisted pressure equalizing passage 22 can also be constructed by connecting pipes 23 as shown in dashed lines in FIG.

In the compressor pressure equalization device of the present invention configured as described above, gas leaking into the crank chamber 12 from the sliding surface between the piston and the cylinder of the compressor is absorbed into the crank chamber by splash lubrication. Among the oil droplets scattered within the annular plate member 12 , a relatively small number of oil droplets that are far from the concentric circle of the crankshaft 13 where the oil droplet density is high are transferred to the donut-shaped cavity 18 through the through hole 21 of the annular plate member 19 . Enter the hole 21 with
The energy is gradually reduced by the resistance when passing through, the expansion within the cavity 18, and the resistance in the pressure equalization passage 22,
The oil content is sufficiently separated and only the gas is guided to the suction passage 11 via the pressure equalization passage 22, thereby producing a pressure equalization effect.

The oil collected in the cavity 18 flows downward due to gravity and is returned to the crank chamber 12 through a pressure equalization and oil draining hole 21.

As is clear from the above embodiments, according to the pressure equalizing device for a compressor of the present invention, a donut-shaped cavity is formed by a plate and a recess formed on the inner surface of a lid member having a bearing for a crankshaft. By expanding the gas and lowering the flow velocity, it is possible to sufficiently separate and reduce the oil content in the gas, thereby achieving a pressure equalization effect and eliminating the oil swell phenomenon, thereby preventing the shortage of lubricating oil. It is possible to reliably prevent accidents such as seizing of the sliding parts due to this.

The above-mentioned hollow portion is formed by simply forming an annular recess on the inner surface of a lid member having a bearing for the crankshaft, and attaching an annular plate member having a through hole to the open end of the recess. Therefore, there is a possibility that it can be constructed structurally simply.

Furthermore, when a compressor equipped with this device is used in refrigeration equipment, the oil build-up phenomenon is prevented, so it is possible to effectively prevent the deterioration of refrigeration capacity due to the suction of oil into the refrigerator, which has been a problem in the past. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional pressure equalizing device for a compressor, and FIG. 2 is a sectional view showing an embodiment of the pressure equalizing device for a compressor according to the present invention. 11... Gas suction passage, 12... Crank chamber, 13
... crankshaft, 16 ... lid member, 17 ... bearing,
18...Cavity part, 21...Through hole for equalizing pressure and draining oil,
22... Pressure equalization passage, 23... Pressure equalization pipe.

Claims (1)

[Scope of utility model registration request] A bearing is placed on the inner surface of a lid member that has a bearing that supports one end of the crankshaft, and an annular recess is formed, and an annular plate with a through hole is attached to the open end of the recess to communicate with the crank chamber. A pressure equalizing device for a compressor, comprising a donut-shaped cavity that communicates with each other, and a pressure equalizing passage that communicates a gas suction passage of the compressor with the cavity.