JP3491950B2 - Oil mist separator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mist separator used for a bearing stand or a reduction gear of a rotary machine. [0002] Conventional high / low pressure gas / liquid separators include:
Gravity sedimentation method, inertial collision method, cyclone method, filtration method, washing method, electrostatic method, etc. (sound, heat, freeze)
There is a method of the method. For bearing stands and reduction gears of rotating machinery,
Generally, a filtration method is often used to avoid an increase in the internal pressure, and an inertial collision method using a demister is often used when a high-pressure gas is used. Further, when the pressure loss does not cause a serious problem and a high separation efficiency is not expected, a cyclone method is often adopted because of its simple structure. [0003] In a bearing stand of a rotating machine, air, nitrogen gas or inert gas is often used for oil mist sealing, and the pressure of the injected gas is atmospheric pressure. Is discharged to the atmosphere through a gas-liquid separator by a filtration method. In this case, when the particles of the oil mist are large (about 20 μm or more), pressure loss increases due to oil wetting of the filter medium, and oil leakage from the seal portion occurs due to an increase in the internal pressure of the bearing stand. As a countermeasure, a method of making the filter medium rough is adopted, but in this case, as a result, gas-liquid separation becomes insufficient and oil droplets come out together with the exhaust gas to cause oil leakage. On the other hand, in the cyclone system used for high-pressure gas, the collection efficiency is low. Therefore, as a countermeasure, the flow rate of the air blown into the oil separator is increased, a baffle plate is provided at the bottom of the tank, or a packing is placed. . As a result, the pressure loss increases, and the liquid film is often carried away from the wall surface along the gas outlet nozzle and scattered again, so that it cannot be used for a bearing stand or a reduction gear of a rotating machine. An object of the present invention is to provide an oil mist separator that can solve the above problems. An oil mist separator according to the present invention comprises a tank, an inlet pipe for introducing gas containing oil mist into the tank at an angle to an inner wall surface of the tank, and a tank. upper and lower partition, the lower partition of the scraper to collect the provided oil droplets protrudes from the inner wall surface of the tank downwardly having an opening at the Rutotomoni opposite sides provided within,
And between the upper partition and the top of the tank
Characterized in that it is provided with a filtered filter . In the present invention, the flow of the gas containing the oil mist is introduced at an angle from the inlet pipe to the inner wall surface of the tank, and from the large oil droplets adheres to the inner wall surface of the tank by inertial collision. . The attached oil moves in the same direction as the gas, but is collected by a scraper protruding from the inner wall surface of the tank and separated from the gas. Next, the flow of the gas containing the oil mist is passed through upper and lower partitions having openings on opposite sides .
Since the gas flows through the tank through the gap, the residence time of the gas in the tank becomes longer, and the gas flow is accelerated / decelerated when passing through the upper and lower openings. . afterwards
A filter provided between the upper partition and the top of the tank
The oil mist remaining after passing through the Luther is collected. Therefore, the mist mixed in the gas is enlarged and adheres to the wall surface of the partition, and the oil is separated from the gas. As described above, in the present invention, the oil mist mixed into the gas is effectively separated from the gas. An embodiment of the present invention will be described with reference to FIGS. Reference numeral 2 denotes a cylindrical vertical tank, through which an inlet pipe 1 for air containing oil mist penetrates the bottom wall and extends upward into the tank 2. The outlet 1a is bent about 90 ° in the horizontal direction, and the opening at the tip of the outlet 1a has an angle of 50 to 70 ° with respect to the inner wall surface of the tank 2 as shown by the symbol X in FIG. No. In a portion above the introduction pipe 1 in the tank 2,
Two substantially horizontal partitions 4 are provided at intervals from each other, and the partition 4 has an opening 4 between the partition 4 and the inner wall surface of the tank 2.
a is provided. As shown in FIG. 1, the opening 4a of the lower partition 4 and the opening of the upper partition 4 are on opposite sides, and a zigzag passage is formed in the tank 2 by the partitions 4 and 4. At a position approximately 180 ° away from the outlet of the leading end of the introduction pipe 1 in the tank 2 around the axis of the tank 2, from the inner wall surface of the tank 2 to the upstream side in the air flow direction (indicated by an arrow in the drawing). A scraper 3 is provided which protrudes in a direction inclining toward it and is arranged vertically. The scraper 3 is arranged so as to extend from the lower partition 4 to the bottom of the tank 2. A gas outlet 7 is provided on the upper side wall of the tank 2, and a filter 5 is provided between the upper partition 4 and the top wall of the tank 2. Reference numeral 6 denotes a recovery oil outlet provided on the bottom wall of the tank 2. The arrows in FIGS. 1 and 2 indicate the direction of air flow. The blowing speed of the air containing oil mist from the tip of the introduction pipe 1 is 1 to 3 m / m to reduce the pressure loss.
s. The height of the scraper 3 projecting from the inner wall surface of the tank 2 is set to be equal to or less than 1/20 of the diameter of the tank 2 so that pressure loss does not occur. The flow velocity of the air
The diameter is set to four times or more the diameter of the introduction pipe 1 so as to rapidly reduce the speed to about / 10. The area of the opening 4a of the partition 4 is 2/1 of the sectional area of the tank 2 so that the flow velocity of the air is accelerated.
It is about 0. In this embodiment constructed as described above, the air mixed with the oil mist from the tip of the outlet 1a of the introduction pipe 1 forms an angle X of 50 to 70 ° with respect to the inner wall surface of the tank 2. The air is blown out and flows as a swirling flow along the cylindrical inner wall surface of the tank 2. The oil mist mixed into the air inertia collides with the inner wall surface of the tank 2, adheres to the inner wall surface of the tank 2, moves along the inner wall surface of the tank 2 in the flow direction of the air, and is collected by the scraper 3. The collected oil mist flows downward along the scraper 3 and is discharged from the outlet 6 of the recovered oil. The gas containing the oil mist from which part of the oil mist has been separated by the scraper 3 is then accelerated by the opening 4a of the lower partition 4 and then decelerated between the upper and lower partitions 4,4. It is further accelerated at the opening 4a of the upper partition 4 and decelerated at a portion above the upper partition 4. As described above, since the air flows through the zigzag-shaped passage between the upper and lower partitions 4, 4, the residence time of the air increases, the direction of the air flow changes, and the air flow is changed as described above. Since the acceleration / deceleration is repeated, the oil mist remaining in the air gradually increases in size and adheres to the wall surface of the partition 4 and is collected. As described above, the opening 4 of the upper partition 4
The air exiting a passes through the filter 5 and is discharged from the upper outlet 7 where the remaining oil mist is collected. In this embodiment, most of the oil mist having a size of 50 μm or more is recovered in the first stage of oil separation of the introduction pipe 1, the tank 2, and the scraper 3. FIG. 3 is an example showing the particle size of the oil mist discharged from the bearing of the rotating machine, the ratio of the number of the particle size, and the weight ratio. In the present embodiment, since most of the oil mist of 50 μm or more is collected in the introduction pipe 1, the tank 2, and the scraper 3, about 80 to 90% of the oil mist is collected in the first stage. Further, the oil mist is enlarged and repeatedly accelerated and decelerated at the intermediate partitions 4 and 4, so that the oil mist is recovered and finally recovered to an oil mist of about 5 to 15% having a particle diameter of 15 μm or less. Further, the remaining oil mist is collected by the filter 5, and at the outlet 7, only the oil mist having a particle diameter of 10 μm or less is discharged. The oil mist having a particle size of about 15 μm or less flows with the flow of the air without being affected by the inertial force and diffuses into the air. As a result, the problem that the oil mist adheres around the outlet 7 does not occur, and no oil leakage occurs. In this embodiment, as described above, the air containing the oil mist is used as a swirling flow, and the oil mist is collected by the scraper 3, the partition 4, and the filter 5, so that the oil mist can be effectively separated. And clean air can be discharged. In this embodiment, as described above, the air containing the oil mist is introduced into the tank 2 from the introduction pipe 1 at a speed of 1 to 3 m / s, but the pressure loss does not cause a serious problem. In this case, it is also possible to increase the speed to about 10 m / s to improve the performance of separating the oil mist due to the inertial collision of the oil mist. As described above, in the present invention, the gas mixed with the oil mist introduced from the introduction pipe into the tank becomes a swirling flow, and the oil mist in the gas is collected by the scraper. on further having an opening on the opposite side to each other
The lower partition increases the residence time of the gas, accelerates and decelerates the gas flow, enlarges the oil droplets, adheres to the wall surfaces of the partitions, and collects them. Then the upper partition and the above tank
Oil remaining after passing through the filter
The strike is collected. Therefore, in the present invention, the oil mist mixed in the gas can be effectively separated from the gas.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an oil mist separator according to one embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a diagram showing a distribution of mist discharged from a bearing of a rotating machine. [Description of Signs] 1 Inlet pipe 1a Outlet of inlet pipe 2 Tank 3 Scraper 4 Partition 4a Opening of partition 5 Filter 6 Recovered oil outlet 7 Gas outlet

Continuation of the front page (56) References JP-A-5-296611 (JP, A) JP-A-2-111412 (JP, A) JP-A-48-98366 (JP, A) JP-A-59-123557 (JP) , U) Japanese Utility Model Application Showa 57-86648 (JP, U) Japanese Utility Model Application 4-1113 (JP, U) Japanese Utility Model Utility Model 1-83412 (JP, U) Japanese Utility Model Application Showa 55-16856 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16N 31/02 B01D 45/12 B04C 3/00

Claims (1)

(57) Patent Claims 1. A tank, inlet tube for introducing at an angle into the tank against the inner wall surface of the entrained gas tank of oil mist, Rutotomoni provided in the tank to each other Upper and lower partitions having openings on opposite sides, a scraper provided below the lower partition and protruding from the inner wall surface of the tank to collect oil droplets , and Between the partition and the top of the tank
An oil mist separator comprising a filter provided in the oil mist.