JP2001300540A - Drain cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain cleaning device for increasing the electric conductivity by sufficiently de-aerating air in drain to facilitate a flow of an electric current and enhancing oil/water separation performance of the drain. SOLUTION: This drain cleaning deice feeds the drain turbid with oil and water into an electrolytic separation tank from a sub-tank to separate the oil and water at the electrolytic separation tank, and is provided with a drain feed means for feeding the drain from the sub-tank to the electrolytic separation tank a desired time later, in the case that a lower part liquid surface detector in the sub-tank detects the liquid surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain purifying apparatus, and more particularly to a drain purifying oil and water discharged from an air compressor, which is separated and aggregated into oil and water in an electrolytic separation tank, and the oil is floated. The present invention also relates to a drain purification device for separating oil and water into creamy scum containing oil as a main component and clean water.

[0002]

2. Description of the Related Art A conventional drain purifying apparatus will be described with reference to FIG. In FIG. 3, an electrolytic separation tank 3 having at least one pair of positive and negative electrodes 1a and 1b therein and filled with a drain 2 is disposed at the top of the apparatus. A sub-tank 4 for storing the drain 2 discharged from the air compressor is disposed at the lower part of the apparatus. The drain 2 is supplied from a lower supply port 3a of the electrolytic separation tank through a pipe 6 by a drain supply pump 5 to the electrolytic separation tank. 3 is supplied.

The drain 2 is generated in a process in which air is compressed by a compressor and further cooled by an aftercooler, and most of the water formed by condensation of moisture in the air is compressed. An oil component 2a, which is a mechanical lubricating oil, and a floating substance 2b composed of dust mixed in the air, metal abrasion powder on a sliding portion of a compressor component, and the like are included.

[0004] The oil 2a and the floating substance 2b contained in the drain 2 form minute bubbles 7 generated at the electrodes 1a and 1b.
As a result, the scum 8 is carried upward while increasing in size and becomes a creamy scum 8. The scum 8 is accumulated in a scum receiver 10 beside the electrolytic separation tank by a scum scraping device 9 that intermittently scrapes the scum.

On the other hand, the water 2c remaining after the oil-water separation flows out into the specific gravity difference tank 11 beside the electrolytic separation tank, and is sent to the filter function unit 13 via the pipe 12 from the specific gravity difference tank outlet 11a above the liquid level. . Here, more minute solid matter is captured,
After being filtered, it is discharged as clean water.

According to such a conventional drain purifying apparatus, according to Japanese Patent Application Laid-Open No. Hei 10-314502, a single liquid level detector 14 is provided in the sub tank 4 so that a predetermined liquid level is obtained. At times, the drain supply pump 5 is operated via the controller 15, and when the liquid level falls below a predetermined level, the operation of the drain supply pump 5 is stopped.

[0007]

In the above prior art, the liquid level detector 14 is usually fixed at a low position of the sub-tank 4, and when a drain is supplied, the drain is immediately sent to the electrolytic separation tank 3. Can be In this case, in the drain immediately sent, the air dissolved in the liquid is not sufficiently degassed, and the electric conductivity of the drain 2 is small because the dissolved air increases the electric resistance of the drain. In the electrolytic separation tank 3, oil-water separation processing is performed using the drain 2 having a small electric conductivity as an electrolyte, and the electrodes 1a, 1
The electric resistance between the points b and b is large, so that the current hardly flows. Electrical conductivity is a physical quantity defined as the reciprocal of electrical resistance.If this electrical conductivity value is small, the current value flowing through the electrolyte between the electrodes is small, and the amount of microbubbles generated as a result is small, and oil-water separation The function is low, and thus the drain purification capacity is low.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drain purifying apparatus which can sufficiently deaerate air in a drain, increase electric conductivity, facilitate current flow, and improve the oil / water separation function of the drain. It is in.

[0009]

A feature of the present invention that achieves the above object is a drain purifying apparatus that supplies oil-water turbid drain from a sub-tank to an electrolytic separation tank and separates oil-water in the electrolytic separation tank. Means is provided for supplying a drain from the sub tank to the electrolytic separation tank after a desired time has elapsed when the lower liquid level detector in the sub tank detects the liquid level.

[0010] Further, an upper liquid level detector is provided in the sub-tank, and when the liquid level is detected by the lower liquid level detector and the liquid level is detected by the upper liquid level detector before a desired time elapses, the sub-tank is detected. Control means for supplying the drain from the tank to the electrolytic separation tank.

A temperature detecting means and a drain heating means are provided in the sub-tank, and when the liquid level is detected by the lower liquid level detector, the drain temperature is detected by the temperature detecting means and the drain temperature is kept until a desired temperature is reached. The control means for heating by the heating means is provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drain purifying apparatus according to one embodiment of the present invention, in which an upper liquid level detector and a lower liquid level detector are provided in a sub tank, will be described below with reference to FIG.

FIG. 1 is a schematic configuration diagram of a drain purifying apparatus according to the present embodiment. Parts having the same functions as those of the prior art shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, an upper liquid level detector 16 and a lower liquid level detector 17 are provided inside the sub-tank 4, and a liquid level detection signal of the upper liquid level detector 16 is supplied to a controller 19 as a control means. To the lower liquid level detector 17
Is sent to the controller 19 after passing through the timer 18.

The operation of such a device is as follows. When the drain 2 is sent from the air compressor to the sub tank 4, the liquid level, that is, the supply of the drain is detected by the lower liquid level detector 17, and the signal is sent to the timer 18. The timer 18 has a preset idle time, and after this idle time elapses, a detected electrical signal is sent to the controller 19. As a result, the drain supply pump 5 operates,
The drain 2 is sent to the electrolytic cell 3. Thus, drain 2
Stays in the sub-tank 4 for the time set by the timer 18, so that the air in the liquid is sufficiently degassed during this time. The drain 2 is sufficiently degassed, and the value of the electric conductivity of the drain 2 is high. Even if the DC voltage for electrolytic separation is not increased, current flows well in the electrolyte between the electrodes 1a and 1b, The generation of microbubbles from the surface is also active, and the oil-water separation function is improved.

When the supply amount of the drain 2 to the sub-tank 4 is large and the upper liquid level detector 16 detects the liquid level before the elapse of the timer set time, the drain supply pump 5 is operated by the controller 19 and the drain 2 is discharged. It is sent to the electrolytic separation tank 3. Thereby, the overflow in the sub tank 4 is prevented.

Since the characteristics of the drain 2 vary depending on the specifications, installation location, season, etc. of the air compressor, in actual operation, the timer set time is measured in advance by measuring the electric conductivity of the drain 2 at the start of operation. , The fluctuation range is predicted and set.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, in addition to the upper liquid level detector 16 and the lower liquid level detector 17, a temperature detector 20 and an electric heater 21 serving as a heating means are provided inside the sub-tank 4, and a detected electric signal of the temperature detector 20 is provided. Is controller 1
9 The electric heater 21 is connected to the controller 1
9 is controlled by the electric heater controller 22 based on the control electric signal of No. 9.

In such an apparatus, when the liquid level is detected by the lower liquid level detector 17, the temperature is controlled by the controller 19 and the temperature of the drain 2 detected by the temperature detector 20 becomes equal to the set temperature. Then, the electric heater 21 is energized by the electric heater controller 22 to heat the drain. After reaching the set temperature, the temperature detector 2
The electric heater controller 22 controls on / off of the electric heater 21 in response to the decrease / increase of the detected temperature by 0. When the drain in the sub tank is heated, the degassing phenomenon of the dissolved air is accelerated, and the timer setting time can be shortened. Further, even when the amount of drain supplied to the apparatus is large and the upper liquid level detector 16 detects the drain before the elapse of the standing time and supplies the drain to the electrolytic separation tank, it is necessary to sufficiently deaerate by heating to increase the electric conductivity. Can be done.

As the heating means, high-temperature discharge air of an air compressor for discharging factory steam and drain may be used.
In these cases, a controller for a flow control valve provided in the middle of a pipe for steam, discharge air, or the like may be used instead of the electric heater controller 22.

[0021]

As described above, according to the present invention, the air in the drain can be sufficiently deaerated to increase the electric conductivity so that the current can easily flow, and the oil-water separation function of the drain can be improved. A drain purification device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view of a drain purifying apparatus showing one embodiment of the present invention.

FIG. 2 is a schematic view of a drain purifying apparatus showing another embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional drain purification device.

[Explanation of symbols]

 1a, 1b: electrode 2: drain 3, electrolytic separation tank 4, sub-tank 5, drain supply horn 16, upper liquid level detector 17, lower liquid level detector 18, timer 19, controller

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 19/00 C02F 1/24 D C02F 1/20 ZAB 1/46 102 1/24 (72) Inventor Anzai Masao 1007 Kamigo, Ebina-shi, Kanagawa Hitachi Technology Engineering Co., Ltd. Kenichi Kengo, Ryugasaki City, Ibaraki Prefecture 5-2-2 Koyodai F-term in the Research Laboratory, Hitachi Techno Engineering Co., Ltd. 4D011 AA12 AA13 AA14 AC03 AC06 AD03 AD06 4D037 AA12 AA13 AB06 BA01 BA23 BB01 BB02 BB06 CA02 CA04 CA06 4D061 DA08 DC08 EB01 EB16 EB17 EB20 EB37 EB39 FA01 FA03 FA13 GA04 GA09 GC04 GC05

Claims (3)

[Claims] 1. A drain purifier for supplying oil-water turbid drain from a sub-tank to an electrolytic separation tank and separating oil-water in the electrolytic separation tank, wherein a desired liquid is detected when a lower liquid level detector in the sub-tank detects a liquid level. A drain purifying device comprising means for supplying drain from a sub tank to an electrolytic separation tank after a lapse of time. 2. The drain purifying apparatus according to claim 1, further comprising: an upper liquid level detector provided in the sub-tank, wherein the liquid level is detected by the lower liquid level detector and before a desired time elapses. A drain purifying device, comprising: a control means for supplying drain from a sub tank to an electrolytic separation tank when a liquid level is detected by an upper liquid level detector. 3. The drain purifying apparatus according to claim 1, further comprising a temperature detecting means and a drain heating means in the sub-tank, wherein the temperature detecting means is provided when the liquid level is detected by the lower liquid level detector. And a control means for detecting a drain temperature in the sub-tank and heating the drain by the drain heating means until the temperature reaches a desired temperature.