JPH025114Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic oil-water separator applied to a screw air compression system, and more specifically to a drain drainer for draining condensate accumulated in an oil separator that constitutes a screw air compression system. The present invention relates to an automatic oil-water separator that is capable of adsorbing even minute amounts of water dispersed in oil that otherwise cannot be removed.

As is well known, air compression systems are used in various industries, and screw air compression devices are often used because of their low noise and ease of maintenance. This screw air compressor basically consists of a screw air compressor, an oil separator, an oil cooler, and an oil filter for removing dust.The air sucked into the screw air compressor is free of oil. Lubrication,
Cooled and compressed by the rotation of the screw rotor under a seal, the resulting mixed fluid of compressed air, oil, and moisture then flows into an oil separator, where it is separated into compressed air and oil, and the compressed air is used for compressed air use. While being supplied to the equipment, the oil is cooled again by differential pressure through oil pipes, and is returned to the screw air compressor while being cleaned of dust.
Drainage accumulates in the oil separator. One reason for this is that the screw air compressor itself generates moisture during the compression process, and another reason is that the oil separator when the compressed air equipment is stopped and the screw air compressor stops operating. The formation of moisture due to condensation within
Furthermore, moisture accumulates inside the oil separator due to condensation due to temperature differences between the inside and outside of the oil separator.

If this drain is allowed to remain in the oil, the oil will deteriorate and shorten its life. Furthermore, if left as is, the oil filter disposed in the oil pipe between the oil separator and the screw air compressor will be severely worn out, requiring replacement in a short period of time and shortening the life of the air compressor.

Therefore, technology has been used to remove the drain from the oil separator. That is, a drain drain is connected to the bottom of the oil separator, and the circulation oil pipe on the secondary side is connected to the oil pipe between the oil separator and the screw air compressor, and the drain is periodically drained automatically or manually. In addition to draining water to the outside, a small amount of oil is circulated through differential pressure. Many of these drain drainers utilize the difference in specific gravity between oil and water; for example, Utility Model Application No. 131243/1987 proposed by the present applicant;
−008523, Jitsugan No. 1983-089614, Jitsugan No. 1983-
Seen in No. 15304 or JP-A-56-14895.

According to these, most of the moisture accumulated in the oil separator is discharged to the outside, which prevents oil deterioration to a considerable extent. Although this prevents wear and tear on the screw air compressor itself, the above-mentioned drain drainer separates oil and water due to the difference in specific gravity when oil mixed with water enters the drain drainer, and circulates the oil that floats on top. On the other hand, since the structure is such that the float is operated to discharge the drain when the amount of water accumulated at the bottom reaches a certain level, it is impossible to remove the fine water particles dispersed in the oil. For this reason, oil deterioration cannot be completely prevented, and the accumulation of moisture accelerates the deterioration of the oil filter for removing dust between the oil separator and the screw air compressor, and the screw air compressor.

The present invention has been developed in view of these points, and its gist is to provide an oil-water automatic separator that is applied to the above-mentioned screw air compression system by simply using a drain device. A drain drainer is connected to the lower part of the oil separator without any configuration and is used to drain the drain accumulated in the oil separator, and a drain drainer is branched from the secondary side of this drain drainer and connected to the middle of the oil pipe. It is constructed by a combination of an oil filter consisting of a filter placed in the middle of the oil circulation pipe to adsorb fine moisture dispersed in the circulating oil.
The purpose is to provide an apparatus capable of removing even fine water dispersed in circulating oil that cannot be removed by a drain drainer.

More specifically, most of the water that accumulates in the drain separator is discharged to the outside by a drain drainer, and in addition, fine water particles that get mixed into the oil are removed by a filter on the secondary side. The filter itself on the secondary side is designed to simply absorb the fine water particles contained in the circulating oil by discharging a large amount of condensate using a condensate drainer in the preceding stage. By doing so, we can significantly extend its lifespan.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the screw air compression system to which this invention is applied will be explained. This system consists of a screw air compressor 1, an oil separator 3 connected to it via a pipe 2, and an oil separator 3.
It consists of an oil cooler 5 disposed between an oil pipe 4 connecting the screw air compressor 1 and the screw air compressor 1, and an oil filter 6 for removing dust.

Air A taken in through the air intake port 7 of the screw air compressor 1 is trapped between the toothed space between the pair of screw rotors rotated by the motor 8 and the casing, and at the same time It is compressed by the process. During compression, oil is continuously injected, and the heat of compression is taken away by this mist-like oil, and nearly isothermal compression is performed.
It seals the rotor gap and provides lubrication between the rotors. In the final stage of compression, the compressed air that has reached a specified pressure is discharged from the casing, and a mixed fluid B consisting of the compressed air, moisture generated after compression, the oil, and dust is led to the oil separator 3. Here, due to the difference in specific gravity, the compressed air
Separated into A' and oil C. At that time, even fine oil is collected by the oil separator element 9,
Oil separation is thorough.

Compressed air A' is thereafter supplied to compressed air using equipment (not shown). On the other hand, oil C passes through oil pipe 4,
Oil separator 3 and screw air compressor 1
The pressure difference between the two causes the air to flow back to the screw air compressor 1. On the way, the oil is cooled by an oil cooler 5 and dust in the oil is removed by an oil filter 6.

In this process, water vapor in the air is converted to water by the compression of air A in the screw air compressor 1 and is contained in the mixed fluid B, and due to the temperature difference between the inside and outside of the oil separator 3 casing. Moisture D accumulates in the oil separator 3 due to reasons such as condensed water being generated when the compressed air A' is stopped, or condensed water being generated simultaneously when the screw air compressor 1 is stopped due to the stoppage of use of the compressed air A'.

This causes the various problems mentioned above,
The present invention is as follows.

That is, a drain drain 11 is connected to the bottom of the oil separator 3 via a pipe 10. Although various things are considered for this drain drainer 11, one reason is that when oil mixed with water is received, oil C is on top and water D is on the bottom due to the difference in specific gravity. When a predetermined amount of water has accumulated, that certain amount is detected by the levitation of a float that is activated only by the specific gravity of water, and thereafter a desired electric switch is operated by the float levitation operation, A structure in which the condensed water D is discharged to the outside by opening a solenoid valve or the like is considered. Alternatively, a timer may be set for a certain amount of time during which a predetermined amount of water D accumulates, and a solenoid valve is opened at a certain period to discharge the condensed water to the outside. Therefore, a valve may be opened to drain the condensed water.

A drain drainer 1 is used to return the oil C separated by the drain drainer 11 to the original oil pipe 4.
A circulating oil pipe 12 is connected between the secondary side of the oil pipe 1 and the oil pipe 4. In this case, in order to suck the oil in the drain drainer 11 by a pressure difference such that the oil C in the oil separator 3 is sucked by the pressure difference of the screw air compressor 1, the drain drainer 11
It may be connected anywhere upstream of the oil filter 6 in the oil pipe 4 as long as it has a differential pressure with respect to the internal pressure, but in the example shown, it is connected to the branch point 13 between the oil filter 6 and the oil cooler 5. There is. and,
The automatic oil/water separation device of the present invention is based on this circulating oil pipe 12.
An oil filter 15 consisting of a filter 14 capable of adsorbing fine water particles dispersed in the oil is arranged in the middle of the oil filter. In this example, a cylindrical filter 14 is disposed inside a casing 16, and a circulating oil pipe 1
Put the oil in 2 into casing 16 and filter 1
An example is shown in which filtering is carried out from the outside to the inside of 4.

The following examples can be given as the above filter 14. That is, the main component is softwood bulb,
Cellulose fibers containing a large number of hydrophilic acid groups are made into a thin sheet, coated with a specific crepe, and then formed into a roll with a slitter, making it highly absorbent and hydrophilic. According to this filter 14, fine dispersed particles of 10 micron units in oil are physically adsorbed by the gaps between the papers. Furthermore, the extremely fine dispersed particles of 1 to 0.01 microns in the oil are adsorbed in the capillaries between the fibers, which are formed in countless numbers by intertwining cellulose fibers.

In this way, the drain drainer 11 and the oil filter 1
5, first, the oil containing water in the oil separator 3 is led to the drain device 11, where it is separated into oil C and water D by specific gravity separation.
The separated water D is discharged to the outside, while the oil C enters the casing 16 of the oil filter 15 via the circulation oil pipe C, and then passes through the filter 14. At this time, the water mixed into oil C as minute particles is
It is adsorbed by the filter 14. Therefore, only the oil C reaches the oil pipe 4 via the branch point 13 due to the differential pressure, joins with the oil C flowing from the oil separator 3 toward the screw air compressor 1, passes through the oil filter 6, and flows through the screw air compressor 1. air compressor 1
be returned to.

In this way, the present invention first discharges most of the water accumulated in the oil separator 3 to the outside using a drain device, and then removes the fine water particles that cannot be removed by specific gravity separation using a filter that can adsorb fine water molecules. 14, water is better removed from the oil C, preventing the oil from deteriorating more quickly and further extending the life of the oil. Moreover, the life of the screw air compressor 1 and the oil filter 6 is extended. Furthermore, most of the moisture in the filter 14 of the oil filter 15 itself is removed through specific gravity separation by the drain device 11 in the preceding stage, so the wear and tear on the filter 14 itself is not severe and the service life is long. It exhibits various practical advantages, such as:

[Brief explanation of the drawing]

The attached drawing is an overall configuration diagram showing an embodiment of the present invention, in which 1 is a screw air compressor, 2 is a pipe,
3 is an oil separator, 4 is an oil pipe, 5 is an oil cooler, 6 is an oil filter, 7 is an air intake port, 8 is a motor, 9 is an oil separator element, 10 is a pipe connected to the bottom of the oil separator 3, 11 is a Drain drainer, 12 is a circulation oil pipe, 13 is a connection branch point, 14 is a filter, 15
is the oil filter, 16 is the casing, A is the air,
A' is compressed air, B is a mixed fluid of oil, compressed air, and moisture, C is oil, and D is moisture.

Claims (1)

[Claims for Utility Model Registration] Intake air is lubricated, cooled and sealed with oil,
A screw air compressor 1 that compresses air by the rotation of a screw rotor, and an oil separator 3 that receives the mixed fluid of compressed air, moisture, and oil generated here through a pipe 2 and separates the compressed air and oil.
and an oil cooler 5 disposed in the middle of the oil pipe 4 which sends the oil separated by the oil separator 3 to the screw air compressor 1 again based on the pressure difference between the oil separator 3 and the screw air compressor 1. In a device comprising an oil filter 6 and having means for separating oil and water between the oil separator 3 and the screw air compressor 1; A series of oil separators 3
Drain drainer 11 for draining drain accumulated inside
and a filter for adsorbing fine moisture to be dispersed in the circulating oil, which is disposed midway in the oil circulation pipe 12 which is branched from the secondary side of the drain device 11 and connected to the midway of the oil pipe 4. 1. An automatic oil-water separator applied to a screw air compressor, characterized in that it is configured by a combination of an oil filter 15 consisting of 14 parts.