JPH09290113A - Oil mist separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil mist separator which is constituted in such a way that oil mist turned into oil drops by a filter can be prevented from being carried again in exhaust gas and discharged into open air. SOLUTION: A spiral flow room F with the first stage filter 1 and a filter section with the second filter L are formed in such a way that the inside of a cylindrical oil mist separator is divided concentrically into a plurality of layers. An exhaust gas inlet E is provided in the tangential direction of the outer periphery of the upper part of the oil mist separator and the flow of the exhaust gas is introduced from the upper part of the filter. Below each filter I and L, a drain room J and an oil collecting room M are provided and the exhaust gas is made to flow in the falling down direction of the oil drops from the filter. The exhaust gas from which the oil mist is separated is exhausted into open air from an exhaust gas pipe N and on the other hand, collected oil mist is discharged from the drain room U.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mist separator used in an oil tank forced exhaust system.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. Oil tank exhaust oil mist separator is a demister type D-
1 and a cyclone type D-2, which are used properly according to the capacity of the exhaust fan B.

In these conventional oil mist separators, the exhaust gas forcedly discharged from the oil tank A by the exhaust fan B is taken in from below the mist separator, and the filter (demister) T inside the mist separator collects the oil mist contained in the exhaust gas. The oil is collected, converted into oil drops, and discharged from the drain pipe U as drain.

The exhaust from which the oil mist has been removed is exhausted to the atmosphere through an exhaust port V above the mist separator. Further, since the oil mist separator is provided at the end of the exhaust pipe, it is installed outdoors above.

[0005]

In the conventional oil mist separator, the exhaust gas forcedly exhausted from the oil tank A is taken in from below the oil mist separator, and the filter (demister) T inside the separator traps the oil mist in the exhaust gas. It collects and drops oil, and discharges the oil that falls under its own weight as drain. However, due to the structure of the filter (demister) T, it is necessary to collect 3 to 5
It is said that it is desirable to pass the exhaust gas at a flow rate of m / sec.

Here, the problem is that the oil mist collected / oiled by the filter (demister) T is about to fall by its own weight because it is blown up again by the exhaust air blown up from below. The efficiency of the (demister) T is poor, and in the worst case, oil mist that has turned into oil droplets passes through the filter (demister) T and is discharged to the atmosphere as oil droplets along with the exhaust gas, polluting the oil mist separator area with oil. Is the point.

If the flow velocity in the oil mist separator is slowed down, the oil mist in the exhaust gas passes through the gap of the filter (demister) T, so that the oil mist in the exhaust gas is discharged to the atmosphere as it is. Will result in.

Since the oil mist separator is installed at a high place outdoors at the end of the exhaust pipe, the oil mist separator body is heated due to direct sunlight during summer and the like, and the internal exhaust gas also becomes hot, This creates a condition that makes it difficult for oil mist to form oil droplets.

An object of the present invention is to provide an oil mist separator which is constructed so as to prevent the oil mist, which has been made into oil droplets by a filter, from being exhausted to the atmosphere again by riding on the exhaust gas and which can be installed indoors. There is.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in an oil mist separator used in an oil tank forced exhaust system, the present invention has a cylindrical oil mist separator having a plurality of layers in a circular center circle. Provided is an oil mist separator which is provided with a partition and a filter and a drain chamber between the partitions, and an exhaust inlet is provided in a tangential direction of an upper outer periphery of the oil mist separator to introduce an exhaust flow from the upper part of the filter.

In the oil mist separator of the present invention thus constructed, the exhaust gas is introduced from the tangential direction of the upper outer periphery and flows along the cylindrical shape inside the separator which is concentrically partitioned into a plurality of layers, and its specific gravity is increased by centrifugal force. A heavy oil mist is pressed against the outer wall surface to form oil drops.

Further, in the oil mist separator of the present invention, since the exhaust gas inflow direction into each filter is from the upper part to the lower part, the oil droplets drained by the filter are collected in the drain chamber by the exhaust gas flow, The ability to collect oil mist can be improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an oil mist separator according to the present invention will be specifically described based on the embodiments shown in FIGS. In the following embodiments, parts having the same configurations as those of the conventional device shown in FIG. 3 are designated by the same reference numerals for simplification of description.

In FIG. 1, D indicates an oil mist separator and E indicates its exhaust inlet. Exhaust inlet E
Is tangentially provided on the outer periphery of the upper part of the oil mist separator D and opens to the swirl chamber F. A first stage filter I is housed in the lower part of the swirl chamber F, and a drain chamber J is located below the first stage filter I.

A filter section having a second-stage filter L and an oil collecting chamber M is formed inside the swirl chamber F so as to be separated from the convection chamber K. The exhaust gas after separating the oil mist from the center of the filter section is formed. An exhaust pipe N that guides the air to the outside is provided.

The oil collecting chamber M is connected to the drain chamber J through the U seal O.
The drain chamber J is communicated with the oil purifier through a drain pipe U having a U seal Q. In the figure, C is a hydraulic device, and H is a heater for heating the oil in the oil tank A.

The operation of the oil mist collecting / oil dripping system having the oil mist separator D constructed as described above will be described. The oil in the oil tank A is heated by the heater H to a temperature at which the oil can be sucked into the pump, and is supplied to the hydraulic device C by the oil pump P.
Is discharged. At this time, the oil discharged from the hydraulic device C is the hydraulic device C.
Is discharged to the oil tank A while being heated. As a result, the oil mist floats in the upper space of the oil tank A.

Further, in order to facilitate drain return of the hydraulic equipment C, the upper space of the oil tank A is forcibly exhausted to a negative pressure by the exhaust fan B, so that the oil mist in the upper space of the oil tank A is also exhausted. Is sucked out with. The exhaust containing the oil mist discharged by the exhaust fan B is guided to the swirl chamber F from an exhaust inlet E provided at the upper part of the outer peripheral surface of the oil mist separator D.

The exhaust gas flows along the cylindrical shape of the swirl chamber F, so that the oil mist having a high specific gravity is pressed against the outer wall surface of the swirl chamber F by the centrifugal force, and is collected to form oil droplets. At this time, the higher the exhaust gas inflow velocity into the swirl chamber F, the better. Further, in order to prevent a backflow that obstructs the exhaust flow in the swirl chamber F, a backflow prevention gap G is provided at the contact portion of the inlet portion of the swirl chamber F with the outer peripheral surface of the convection chamber K. It is also necessary to make it as small as possible.

The oil mist formed into oil droplets in the swirl chamber F is
The exhaust flow in the swirl chamber F and its own weight lead to the first-stage filter I packed in the chamber formed by the partition plate provided below the swirl chamber F and the upper lid of the drain chamber J. The oil mist that could not be formed into oil droplets in the swirl chamber F reaches the first-stage filter I together with the exhaust flow.

The oil mist that has flowed into the first-stage filter I without being made into oil droplets becomes 1 due to the speed of entry into the first-stage filter I.
By colliding with the wire of the stage filter I and adhering to the surface of the wire, the wire is collected by the stage filter I and gradually becomes oil drops.

Here, the oil mist that has already turned into oil droplets in the swirl chamber F and is guided to the first-stage filter I adheres to the wire of the first-stage filter I, and does not turn into oil droplets in the swirl chamber F, and the first-stage filter I Since the action of adhering to the oil mist and growing into larger oil droplets is generated, the ability of the first-stage filter I to collect and form oil droplets is improved.

The oil mist collected and made into oil droplets by the first-stage filter I falls by its own weight with the exhaust flow in the first-stage filter I, and reaches a drain chamber J formed in an inverted conical shape. After reaching the drain chamber J, the oil mist that could not be converted into oil droplets in the first-stage filter I is guided to the second-stage filter L provided in the middle portion of the convection chamber K through the convection chamber K together with the exhaust flow. Get burned.

The oil mist that has not been formed into oil droplets and is guided to the second-stage filter L collides with the wire of the second-stage filter L due to the speed of entry into the second-stage filter L and adheres to the surface of the wire. It is collected by the stage filter L and gradually becomes oil drops.

The oil mist collected and made into oil droplets by the second-stage filter L falls by its own weight with the exhaust flow in the second-stage filter L and reaches the oil collecting chamber M. Exhaust gas from which the mist has been removed to the limit by the swirl chamber F, the first-stage filter I, and the second-stage filter L is discharged to the outdoor atmosphere through the exhaust pipe N.

The oil mist that has been made into oil droplets by the second-stage filter L and has reached the oil collecting chamber M is guided to the U seal O, and overflows when the amount of oil in the U seal O exceeds a certain amount, and the drain chamber J Leading to.

Here, the U-seal O directly discharges the oil collected in the oil collecting chamber M to the drain chamber J, and the exhaust containing the oil mist filled in the drain chamber J directly receives the oil. Is filled with oil so that the pressure difference between the drain chamber J and the oil collecting chamber M is ensured.

The oil mist, which has been made into oil droplets from the first-stage filter I and the U seal O and is guided to the drain chamber J, is guided to the U seal Q through the drain pipe U by its own weight and exhaust pressure, and
When the amount of oil in the seal Q exceeds a certain amount, it overflows and is discharged to the hydraulic system as drain.

Here, the U-seal Q is provided with an exhaust port for discharging the drain collected in the drain chamber J to the oil system side,
The exhaust gas containing the oil mist is filled with oil so that it is not directly discharged to the drain side, and the head pressure difference on the oil surface serves to maintain the exhaust pressure in the drain chamber J.

Since this oil mist separator is constructed in the middle of the oil tank exhaust pipe, the building R
The mist separator body is placed inside, and constant performance can be obtained throughout the year without the mist separator body being heated by outside air or direct sunlight. Further, by arranging indoors, it is possible to arrange without an outdoor maintenance floor such as a conventional mist separator.

The present invention has been specifically described above based on the illustrated embodiments, but the present invention is not limited to these embodiments, and within the scope of the present invention shown in the claims, its specific structure, It goes without saying that various changes may be added to the configuration.

[0032]

According to the conventional oil mist separator,
Since the exhaust flow direction is one direction, there is a case where oil mist that has once turned into oil drops is discharged onto the atmosphere by riding on the exhaust flow, but in the oil mist separator according to the present invention, the exhaust flow flows from the upper side to the lower side. At this time, the oil mist that has turned into oil droplets is dropped into the drain receiver, and the structure is such that only the exhaust gas flows upward, so there is no oil mist discharge unlike the conventional type (at least 3-4 μm oil mist is collected and collected. Oil drops).

In addition, the oil mist separator according to the present invention is arranged indoors to keep the temperature of the oil mist separator body constant and to obtain a constant performance throughout the year. It is possible to eliminate the need to consider installation of an outdoor maintenance floor. As described above, in the oil mist separator according to the present invention, the performance of the oil mist separator can be further improved by setting the indoor location to a low temperature location.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an oil mist separator according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing the structure of a conventional oil mist separator.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 A Oil tank B Exhaust fan C Hydraulic equipment D Oil mist separator E Exhaust inlet F Vortex chamber G Backflow prevention gap H Heater I First stage filter J Drain chamber K Convection chamber L Second stage filter M Oil collecting chamber O U seal N Exhaust pipe P pump Q U seal R building U drain pipe

Claims (1)

[Claims] 1. An oil mist separator used in an oil tank forced evacuation system, wherein the inside of a cylindrical oil mist separator is concentrically partitioned into a plurality of layers, and a filter and a drain chamber are provided between the partitions, and an exhaust gas is provided. An oil mist separator characterized in that an inlet is provided in a tangential direction of an outer periphery of an upper part of the oil mist separator so that an exhaust flow is introduced from an upper part of the filter.