JPH0649792U - Oil-water automatic separator in screw air compressor - Google Patents

Abstract

(57) [Summary] [Purpose] The oil separated by the oil separator is returned to the screw air compressor, the drain is taken out from the bottom of the oil separator, and the water in the oil is separated by the drain drainer. In an air compressor that removes water by adsorbing and removing it with an oil filter for removing water, the oil filter for removing water is metal powder and dust. That is, the pressure difference between the oil separator and the return oil inlet of the screw air compressor is small. Therefore, the pressure drop of the oil filter for removing water does not work significantly. [Structure] A pump 17 is provided in a pipe between the oil separator 3 and the oil filter 15 for removing water to overcome the pressure drop of the oil filter 15 for removing water, and from the secondary side of the drain drainer 11. The oil of (3) is passed through this filter 15 to remove the water content in the oil.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil / water automatic separator in a screw air compressor, and more specifically, in an oil that cannot be removed by a drain drainer for draining drain accumulated in an oil separator that constitutes the screw air compressor. The present invention relates to an oil / water automatic separator capable of absorbing even fine water dispersed in water.

[0002]

[Prior art]

 As is well known, air compressors are used in various industries. Among them, screw air compressors are widely used because of their low noise and easy maintenance. This screw air compressor is basically composed of a screw compressor, an oil separator, an oil cooler and an oil filter for removing dust. The air sucked into the screw compressor is oil-based. Compressed by lubrication, cooling, rotation of the screw rotor under seal. When the working fluid is the one that takes in the atmosphere, water is present in the compressed air, and the oil supplied to the screw compressor mixes in the compressed air. The mixed fluid of compressed air, oil, and water generated there then flows into an oil separator, where it is separated into compressed air and oil, the compressed air is supplied to the equipment using compressed air, and the oil is separated via an oil pipe. It is returned to the screw compressor while being cooled and dust is removed again by pressure, but in the above oil separator, the turbid drain of oil and water accumulates in the lower layer of the separated oil. This is partly because the screw compressor itself produces water in the compression process, and the other reason is that oil separation when the equipment using compressed air is stopped and the screw compressor stops operating. Water is accumulated in the oil separator due to the generation of water due to the condensation inside the tank and the condensation due to the temperature difference between the inside and outside of the oil separator.

If this drain is left in the oil as it is, the oil deteriorates and the life of the oil is shortened. If left as it is, the oil filter for dust removal arranged in the oil pipe between the oil separator and the screw compressor will be worn out rapidly, and the oil filter element must be replaced in a short time, and the screw filter must be replaced. Shorten the life of the compressor.

Therefore, conventionally, a technique for draining the drain inside the oil separator has been put into practical use. That is, the drain drainer is connected to the lower part of the oil separator, and the circulating oil pipe on the secondary side is connected to the oil pipe between the oil separator and the screw compressor to automatically or manually periodically. The drain is drained to the outside and a small amount of oil is circulated by differential pressure. Most of such drainage drainers utilize the difference in specific gravity between oil and water. For example, JP 59-24329, JP 59-12969, JP 59-24330, and JP Fair 2 39529 or JP-A-56-14895.

According to these, most of the water accumulated in the oil separator is discharged to the outside, so that the deterioration of the oil can be prevented to a considerable extent, and the dust between the oil separator and the screw compressor can be prevented. Although it prevents wear of the oil filter for removal and the screw compressor itself, the above drain drainer separates oil and water by the difference in specific gravity when oil mixed with water enters the drain drainer. While the floating oil is circulated, the drain is discharged by operating the float when the amount of water accumulated below reaches a certain level, so the fine water particles dispersed and mixed in the oil are originally Cannot be removed. Therefore, the deterioration of oil cannot be completely prevented, and the accumulation of moisture accelerates the deterioration of the oil filter for removing dust between the oil cooler and the screw compressor and the screw compressor.

As a solution to the above problem, there is a device shown in FIG. 3 disclosed in Japanese Utility Model Publication No. 2-5114. According to this invention, the oil containing water extracted from the oil separator 3 is separated into oil and water by the difference in specific gravity between the lower part of the oil separator 3 and the oil pipe 4 for returning the oil from the oil separator 3 to the screen compressor 1. A drain drainer 11 and an oil filter 15 for removing moisture for adsorbing and removing minute moisture in an oil turbid state by passing oil taken out from the drain drainer are interposed. As a result, the life of the oil filter 6 for removing dust is extended and the service life of the screw compressor 1 is also favorably affected.

[0007]

[Problems to be solved by the device]

However, the capacity of the oil filter for removing water is deteriorated at an early stage. The reason is that the dust sucked by the screw compressor is mixed in the oil separated by the oil separator. A moisture adsorption filter built into the oil filter for moisture removal removes dust in the oil and fine particles of worn metal generated from the screw compressor along with moisture. This filter gradually becomes clogged with dust and fine metal powder (dust). On the other hand, the differential pressure in the oil passage between the oil separator and the suction port of the screw compressor is 0.5 to 1 kg / cm ² , and a smaller differential pressure due to pipe resistance or the like is applied to this filter than the above differential pressure. If it becomes clogged, the oil will not pass through the oil filter for removing water. Due to this, the drain discharger and the oil filter for removing water do not function. In order to avoid this, the water adsorption filter is frequently replaced in a short period of time, which causes economic loss such as the cost of the water adsorption filter, the loss due to the stop of the screw air compression device, and the labor cost.

The present invention solves the above problems in a screw air compressor equipped with an oil / water automatic separator, and provides an automatic oil / water separator for a screw air compressor that can be used for a long time with little maintenance. It is intended to be provided.

[0009]

[Means for Solving the Problems]

 The present invention includes the water separated from the oil pipe and the oil separator, which returns the oil separated from the oil separator inserted in the discharge pipe of the screw compressor to the screw compressor via the oil cooler and the oil filter for removing dust. An oil / water automatic separator is provided that separates this water from the oil and returns it to the screw compressor. This oil / water automatic separator consists of a drain drainer whose inlet communicates with the bottom of the oil separator and a drain drainer. An automatic oil / water component in a screw air compressor equipped with an oil filter for removing water, which has a filter for adsorbing fine water dispersed in oil, with its inlet connected to the next side and its outlet connected to the oil pipe In the separating device, a pump for pressurizing the oil flowing to the oil filter for removing water is provided in the pipe from the oil separator to the inlet of the oil filter for removing water, and the screen air compression apparatus is characterized. It is in oil water automatic separation device.

[0010]

【Example】

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

Example 1 FIG. 1 is a flow sheet of Example 1.

First, a screw air compression apparatus to which the present invention is applied will be described. This apparatus includes a screw compressor 1, an oil separator 3 connected to a screw compressor 1 through a discharge pipe 2, an oil separator 3 and a screw compressor. It is composed of an oil cooler 5 and an oil filter 6 for removing dust, which are arranged between oil pipes 4 connecting to the machine 1.

The air A sucked from the air intake 7 of the screw compressor 1 is trapped between the casing between the teeth between the pair of screw rotors rotated by the motor 8 and the casing. It is compressed as the space shrinks. During compression, oil is continuously injected, and the heat of compression is taken away by this mist-like oil, and while substantially isothermal compression is performed, the rotor teeth and rotor-casing are sealed, and lubrication between rotors, etc. is prevented. Is made. The compressed air is discharged from the casing, and the mixed air B containing the compressed air, the water and the oil generated after the compression, and the dust is guided to the oil separator 3. Here, the compressed air A ′ and the oil C are separated by the difference in specific gravity. At that time, even the fine oil is collected by the oil separation element 9, and the oil separation is thoroughly performed.

The compressed air A ′ is thereafter supplied to a device using compressed air (not shown). On the other hand, the oil C returns to the screw compressor 1 via the oil pipe 4 due to the differential pressure between the oil separator 3 and the screw compressor 1. While being cooled by the oil cooler 5 on the way, dust and the like in the oil are removed by the oil filter 6 for removing dust.

In this process, the compression of the air A in the screw compressor 1 causes the water vapor in the air to be contained in the mixed fluid B as water, and the temperature inside and outside the casing of the oil separator 3. Moisture D is accumulated in the oil separator 3 due to the fact that condensed water is generated due to the difference or that condensed water is generated at the same time when the screw compressor 1 is stopped due to stoppage of use of the compressed air A ′.

A drain drainer 11 is connected to the bottom of the oil separator 3 via a pipe 10. Although various drain drainers 11 are considered, one of them is that when oil containing water is received, the oil C is on the top and the water D is on the bottom due to the difference in specific gravity. When a predetermined amount of water D is accumulated, the float floats, which operates only by the specific gravity of water, to detect the fixed amount of water. Then, the float float operation activates the desired electrical switch to activate the solenoid valve. A structure in which the water etc. is discharged to the outside by opening the valve etc. is considered. Alternatively, a timer may be set for a certain period of time in which a predetermined amount of water D accumulates, and the solenoid valve may be operated at a certain cycle to discharge the condensed water to the outside. It is also possible to open the manual valve to drain the condensed water.

Then, in order 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 drain drainer 11 and the oil pipe 4 to remove water. A pump 17 is provided in the circulating oil pipe 12 on the upstream side of the removal oil filter 15. This pump 17 pressurizes the oil discharged from the secondary side of the drain drainer 11 to supply the pressurized oil to the oil filter 15 for water removal, the inlet of which is connected to the circulating oil pipe 12. I have to. The outlet of the water removing oil filter 15 is connected to the oil pipe 4 on the upstream side of the dust removing oil filter 6 through the pipe 12. The oil filter 15 for removing water has a cylindrical water adsorption filter 14 provided in a casing 16, puts the oil in the circulating oil pipe 12 into the casing 16, and filters the oil by passing it from the outside to the inside. An example is shown.

The following examples can be given as the moisture adsorption filter 14 described above. That is, cellulose fiber having softwood pulp as the main component and having a large number of hydrophilic acid groups was made into a thin sheet, attached with a specific crepe, and then a slitter was formed into a roll shape. It is rich in. According to this moisture adsorption filter 14, fine dispersed particles of 10 micron unit in oil are physically adsorbed by the gap between the sheets. Further, minute dispersed water particles of 1 to 0.01 micron in oil are adsorbed by capillary tubes between fibers formed innumerably due to entanglement of cellulose fibers.

When the drain drainer 11 and the oil filter 15 for removing water are combined in this way to provide the pump 17, the oil containing water in the oil separator 3 is first guided to the drain drainer 11, and Is separated into oil C and water D by specific gravity separation. The separated water D is discharged to the outside, but the oil C is pressurized by the pump 17 in the circulating oil pipe 12, enters the casing 16 of the oil filter 15 for water removal, and then passes through the water adsorption filter 14. . At this time, the water admixed in the oil C as fine particles is adsorbed by the water adsorption filter 14. At the same time, dust and metal powder are removed. Therefore, only the oil C reaches the oil pipe 4 via the branch point 13 by pressurization, joins with the oil C flowing in the oil pipe 4 from the oil separator 3 toward the screw compressor 1, and the oil for dust removal is joined. It passes through the filter 6 and is returned to the screw compressor 1. In the above description, the pump 17 is operated so that the pressure on the outflow side of the water removing filter 15 is slightly higher than the pressure at the branch point 13 of the oil pipe 4 in consideration of the pressure drop in the water removing oil filter 15. Pressure Pressure is set.

In the above, continuous operation is performed when the discharge amount of the pump 17 is set to be slightly higher than the speed at which drainage occurs in the oil separator 3. Further, when the discharge amount of the pump 17 is set to be considerably larger than the speed at which the drain collects in the oil separator 3, the pump 17 operates intermittently.

“Second Embodiment” In the second embodiment, as shown in FIG. 2, a pipe 17 connected to the bottom of the oil separator 3 is provided with a pump 17 and is provided on the outflow side of a water removing oil filter 15. The circulating oil ring 19 is connected to the oil pipe 4 on the upstream side of the oil cooler 5.

[0022]

[Effect of device]

 As described above, according to the present invention, an oil pipe for returning oil is provided between the oil separator and the screw compressor, and the oil cooler and the oil filter for removing dust are interposed in the oil pipe, and the oil pipe is taken out from the lower part of the oil separator. The collected oil is led to the upstream side of the dust removing oil filter through the drain drainer and the moisture removing oil filter, and the oil is supplied to the filter at the upstream side of the water removing oil filter. Since the oil filter for water removal is pressurized because it is installed under pressure, it takes a long time until the filter is clogged, and the position for returning the oil that has passed through the oil filter for water removal can be freely selected.

[Brief description of drawings]

FIG. 1 is a flow sheet of Example 1 of the present invention.

FIG. 2 is a flow sheet of Example 2 of the present invention.

FIG. 3 is a flow sheet of a conventional example.

[Explanation of symbols]

 3 Oil Separator 10 Pipe 11 Drain Drainer 12 Circulating Oil Pipe 13 Branching Point 14 Filter 15 Moisture Removing Oil Filter 17 Pump 19 Circulating Oil Ring

Claims (1)

[Scope of utility model registration request] 1. Water separated from an oil pipe and an oil separator that returns oil separated from an oil separator installed in a discharge pipe of the screw compressor to the screw compressor through an oil cooler and an oil filter for removing dust. An oil-water automatic separator that separates this moisture from the oil containing oil and returns it to the screw compressor.This oil-water automatic separator includes a drain drainer whose inlet communicates with the lower part of the oil separator and a drain drainer. Oil in a screw air compressor equipped with an oil filter for removing water having a filter for adsorbing fine water dispersed in oil, the inlet of which is connected to the secondary side of the oil pipe and the outlet of which is connected to the oil pipe. In the automatic separation device, a screw air compression device characterized in that a pump for pressurizing the oil flowing to the oil filter for removing water is provided in the pipe from the oil separator to the inlet of the oil filter for removing water. Oil-water automatic separation device in.