JPS58183888A - Oil feeding device for oil cooling type screw compressor - Google Patents

Abstract

PURPOSE:To prevent the deterioration of oil contained in discharged air and improve the performance of the compressor by a method wherein a housing having a discharging port is provided with an oil feeding hole connected to an oil feeding system while the discharged air is cooled through the oil injected into the discharging port. CONSTITUTION:The housing 5 having the discharging port 9 is provided with the oil feeding hole 11 connected to the oil feeding system and is formed so as to enable to feed the oil to the discharging port 9 under a discharging stroke of the compressor. In case the oil is injected into the discharging port 9 through the oil feeding hole 11 provided in the housing 5, the discharged air can be cooled in the discharging stroke after a rotor groove 22c is communicated with the discharging port 9. According to this method, the period of time in which the temperature of the discharged air is becoming higher than 100 deg.C, for example, may be shortened to a very short period of time immediately before discharging it to the discharging port 9. Accordingly, the deterioration of the oil contained in the discharged air may be prevented and the amount of oil fed to the compression stroke may be decreased, thereby enabling to reduce lost power due to the oil and improve the performance of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION Takurai's oil type screw pressure sword machine has a pair of interlocking male and female rotors, a casing that houses both rotors, and also has a suction boat and a refueling hole, and is integrally connected to this casing. and a housing having a discharge boat, and during the compression stroke in which air sucked from the suction boat is compressed as the motor rotates, oil is injected into the housing from the oil supply hole to create pressure. IA sealing against incoming air leakage, pressure@air cooling and rotor 14 slippage. Although the desired effect can be obtained by supplying oil in this manner, when the rotor is rotated at high speed, a disadvantage 4 arises in that the loss and force due to oil increases significantly.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, suppress the rise in temperature of discharged air, and improve compression properties. The housing having a discharge boat is provided with an oil supply hole that is connected to an oil supply system, and the discharge stroke or the discharge boat is supplied with oil.

Hereinafter, an example of the present invention will be explained with reference to the drawings.

@ In Figures 1 and 2, 1.2 is a pair of mutually meshing female rotors, and both rotors 1.2 are connected to the suction boat 8.
It is rotatably housed in a casing 3 surrounding the oil supply hole 10. 4 is a cover attached to one side (the left side in the figure) of the casing 3, and inside this cover 4 there are
(Rota l.

The bearing 6a supporting the shaft of No. 2 and the shaft seal 7- of the male rotor I
7 is provided. Reference numeral 5 denotes a housing attached to the other side of the casing 1 (the right side in the figure), and the side wall of the housing 5 has an oil supply hole 11j. and discharge'F:
, 12 are provided, and a discharge boat 9 that communicates with the discharge portions of both rotors 1 and 2 and a bearing 6b that supports the shafts of both rotors 1 and 2 are provided in the □ housing 5.

Reference numeral 13 designates a nozzle installed in the oil supply hole 11, and as shown in FIG. 3, this nozzle 13 is provided with an injection hole 13a, a nozzle mounting screw 13b, and a pipe fitting screw 13c. Reference numeral 14 denotes an oil supply pipe connected to the oil supply hole IO and the nozzle 13, and 15 is a discharge pipe attached to the discharge hole 12 provided in the housing 5.

Next, an explanation will be given of the operation of the heather train having the above-mentioned configuration.

! -Rotor 1.2 I! l! When the suction boat 8 and the rotor 422a of the 11tIlcI-1.2 are in communication, air flows into the rotor groove 22a of the 11tIlcI-1, 2. Further rotate rotors 1 and 2 fn
For example, the communication between the suction boat 8 and the rotor @22a is J#, and then as the rotors 1 and 2 rotate, the communication with the rotor @22b is established.
Since the volume of is reduced, the intake air is released. When the pressure in the rotor groove 22a reaches the desired value, the rotor 42
2c and discharge port) 9Vi series 1, so rotor groove 22c
The compressed air inside is discharged to the discharge port 9.

By injecting oil through the oil supply system 14 and the oil supply hole 10 into the rotor 22b that is put into the compression process, the inner rotors 1 and 2 and between the rotors 1 and 2 and the casing 3 are It is possible to have effects such as a noll effect, a cleaning effect for the rotors 1 and 2, and a cooling effect for the air being compressed.

However, when both rotors 1 and 2 rotate at high speed, the oil supply hole 10
Contrary to the above-mentioned effect, blasting of oil may lead to increased losses likely due to agitation and friction of the oil. Especially both rotors 1.2 and rotor 1.2 and casing 3
If the gap between
At this time, the temperature of the discharged air increases depending on the amount of oil supplied. Therefore, by injecting oil into the discharge boat 9 from the oil supply hole 11 provided in the housing 5, the discharge air discharged in the discharge stroke after the rotor @22c communicates with the discharge boat 9 can be cooled. .

FIG. 4 shows the above-mentioned discharge air and oil supply distribution system at a pressure of 4 m. That is, the air containing the oil discharged into the discharge boat 9 flows into the oil separator 16 through the discharge pipe 15, where it is separated from the oil and the oil mist is also removed by the filter 17. Ru. The discharge air from which oil has been separated in this way is discharged to the discharge pipe 1.
5a, it flows into the aftercooler 18, where it is cooled and then sent to a predetermined department.

On the other hand, the oil separated by the oil separator 16 is collected in the lower part of the oil separator 16, and then transferred to the strainer 22.
After being pressurized by the oil cooler 23 and further cooled by the oil cooler 19, it passes through the oil supply pipe 20 and the bend adjustment valve 21 to the oil supply hole 10 provided in the casing 3 and the housing 5, respectively. '11, it is injected into the rotor groove 22b and the discharge boat 9 during the compression process.

As explained above, according to the present invention, by cooling the discharge air through the oil injected into the discharge boat, the time when the discharge air reaches a high temperature of 100C or more can be reduced to an extremely high temperature immediately before discharge to the discharge port. It can be for a short time. Therefore, it is possible to prevent deterioration of the oil contained in the discharged air, reduce the amount of oil supplied to the compression stroke, and reduce power loss due to oil, thereby improving performance.

[Brief explanation of drawings]

A sectional view taken along the line A-A in the figure, and FIG. 3 is a system diagram of I/Usin oil and discharged air. 1... Male rotor, 2... Female rotor, 5... No. 1 housing, 8... Suction boat, 9... Discharge port), 1
0.11...Oil supply hole, 16...Oil senolator, 20...Oil supply pipe. 1st n Ｅ J Z diagram

Claims (1)

[Claims] 1. A pair of rotors and a female rotor that engage with each other, a casing that encloses both rotors and has a suction boat and a refueling hole M, and this casing is provided with an oil-resistant system for the housing. 1# connected to: fFB/type screw pressure skin 6 with Kinbetsu value as the old hole hakama
Shin's robe? The oil supply system has oil supply holes provided in the casing and housing, respectively, through the oil separator to pressurize the oil supply hole.