JPS5932690A - Oil-cooled screw compressor - Google Patents

Abstract

PURPOSE:To increase the natural frequency of the series of an oil separator and improve the oil separating performance thereof by a method wherein a partitioning plate, equipped with an air path, is provided between the compressor block and the oil separator element. CONSTITUTION:The shell 1 of the oil separator is divided into two chambers 2, 3 by the partitioning plate 4 equipped with the air path 5. When the compressor in the compressor block 7 is driven, the air, having an atmospheric pressure, is compressed and is discharged into the chamber 2 through a discharging pipe 12. The compressed air, discharged into the chamber 2, repeats collisions in a cavity between the compressor block 7 and the partitioning plate 4 and the oil is separated thereby finishing a primary separation. The compressed air, finishing the primary separation thereof, enters into the chambers 3 after passing through the air path 5, the secondary separation of the compressed air and the oil is effected by the oil separator element 8 and, thereafter, is discharged from the discharging port 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an oil-cooled screw compressor.

Conventional compressors of this type have a structure in which the compressor block and oil separator element are housed in the cavity of the oil separator shell, and because the inside of the shell is not divided by partition plates or the like, the oil separator is large. The natural frequency of the oil separator shell is close to the fundamental frequency of the compressor, and it resonates, rather than υ, which is just a formality. Therefore, the oil separator shell cannot be expected to have a great sound insulation effect.

In addition, the noise of the compressor affects the natural frequency of the oil separator element, and this natural frequency is the primary and
If the frequency is close to the second order, the noise may build up more than the noise of the compressor block itself.

In view of the above, the present invention aims to increase the natural frequency of the oil separator system and improve the oil separation performance. , a partition plate having a full air passage is provided between the oil separator element and the interior of the oil separator shell is divided into two, and an oil passage is formed between the partition plate and the inner wall of the shell. .

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

In the figure, reference numeral 1 denotes an oil separator shell, and this shell 1 is divided into two chambers 2 and 3 by a partition plate 4 having an air passage 5. 6 is an oil passage 7 formed between the partition plate 4 and the bottom wall of the shell 1; 8 is a compressor block and an oil separator element provided in the chamber 2.3; 9 is a compressor block; 7 a suction pipe connected to a compressor (not shown), 10 a suction throttle valve attached to the suction pipe 9, a pulley attached to the end of the IIFi pressure fla machine shaft 7a, and 12 the compressor block. a discharge pipe connected to the discharge port of 7 via a check valve 13; 15 an oil discharge pipe connected to the bottom of the chamber 3; 16 a stop valve attached to the end of the oil discharge pipe 15; Reference numeral 17 indicates oil accumulated at the bottom of the oil separator shell 1.

Next, the operation of this embodiment configured as described above will be explained.

When the compressor of the compressor block 7 is fully driven via the pulley 11, air at atmospheric pressure is sucked into the compressor via the suction throttle P valve 10 and the suction pipe 9 and is compressed. This compressed air is supplied with oil during the compression process and is discharged into the chamber 2 through the check valve 13 and the discharge pipe 12. The pressure m air containing oil discharged into this chamber 2 is transferred to the compressor block 7
Collisions are repeated in the cavity between the partition plate 4 and the partition plate 4, and by the time the oil reaches the air passage 5 of the partition plate 4, y90% of the oil has been MA, completing the primary separation.

The compressed air thus separated passes through the air passage 5 of the partition plate 4, flows into the chamber 3, and is separated into compressed air and oil by the oil separator element 8 in this chamber 3. The compressed air is then separated and is discharged from the discharge port 14 as clean compressed air containing 0.02 cc/Nm'' of oil.

As explained above, according to the present invention, a partition plate is attached inside the oil separator shell to divide the oil separator shell into two chambers.
In addition to increasing the rigidity of the shell, it is possible to improve the oil separation performance as an oil separator system. In addition, since the cavity of the chamber housing the compressor block is small, it is possible to increase the natural frequency of the shell, which increases the difference between the frequency of the compressor and the negative effects of resonance, reducing noise. can be reduced.

[Brief explanation of drawings]

The drawing is a sectional view showing one embodiment of the oil-cooled screw compressor of the present invention. ■...Oil separator shell, 4...Partition plate, 5
... Air passage, 6... Oil passage, 7... Compressor block, 8... Oil separator element.

Claims (1)

[Claims] In a compressor in which a compressor block and an oil separator element are housed in an oil separator shell, a partition plate having an air passage is provided between the compressor block and the oil separator element, and the partition plate and the bottom of the shell An oil-cooled screw compressor characterized by having an oil passage formed between it and the wall.