JP2001321765A - Oil-liquid separator - Google Patents

Abstract

(57) Abstract: An oil-liquid separation device capable of reliably removing oil contained in a processing liquid even when removing the oil contained in the processing liquid while passing through an oil-liquid separation tank. I will provide a. SOLUTION: A processing liquid L enters an oil-liquid separation tank 30 from a liquid inlet 38, moves along a curved flow path 40, and exits from a liquid outlet 42. During this time, the oil floating on the liquid surface of the processing liquid L is recovered by the oil recovery device 29. here,
Since the bent flow path 40 is bent, the flow path of the treatment liquid L in the oil-liquid separation tank 30 becomes longer,
The oil mixed in the processing liquid L floats to the liquid level by that much. Therefore, the treatment liquid L can be reliably purified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-liquid separator for removing oil from a liquid containing oil.

[0002]

2. Description of the Related Art For example, a cleaning liquid for removing oil adhering to the surface of a workpiece such as a steel part in a quenching process includes:
Washed oil is mixed. For this reason, when reusing the washing liquid, it is necessary to remove the mixed oil.

[0003]

However, the removal of oil is generally carried out by storing a washing liquid containing oil in an oil-liquid separation tank, and collecting the oil floating on the liquid surface due to a difference in specific gravity with an oil recovery device such as an oil skimmer. Since the recovery method is adopted, when the cleaning liquid is purified while circulating the cleaning liquid between the cleaning liquid and the cleaning liquid for cleaning the article to be processed, the oil component is not sufficiently removed from the oil liquid separation tank. There is a problem that the processing liquid is sent to the cleaning tank.

The present invention has been made in view of such circumstances, and even when removing oil contained in a processing liquid while passing through an oil-liquid separation tank, the oil is reliably removed from the processing liquid. It is an object of the present invention to provide an oil-liquid separation device that can be used.

[0005]

In order to solve the above-mentioned problems, an oil-liquid separation device according to the present invention has an oil-liquid separation tank having a liquid inlet and a liquid outlet, and is formed inside the oil-liquid separation tank. A bent flow path that connects the liquid inlet and the liquid outlet to each other, and an oil recovery device that recovers oil from the liquid surface of the processing liquid in the oil-liquid separation tank. It is formed at the downstream end of the flow path and below the oil-liquid separation tank (claim 1).

According to the present invention, the processing liquid enters the oil-liquid separation tank from the liquid inlet, moves along the bent flow path, and exits from the liquid outlet. During this time, the oil floating on the liquid surface of the treatment liquid is recovered by the oil recovery device. Here, since the bent flow path is bent, the flow path of the processing liquid in the oil-liquid separation tank becomes longer, and the oil mixed in the processing liquid surely reaches the liquid level. Will emerge. Therefore, the treatment liquid can be reliably purified.

Of course, the oil-liquid separator stops both the inflow of the processing liquid from the liquid inlet and the outflow of the processing liquid from the liquid outlet, and stores the processing liquid therein. Can also be used.

The bent channel can be formed in a meandering shape using a partition plate, for example.

In the above-mentioned oil-liquid separation device, the oil-liquid separation tank may include a primary oil-liquid separation region upstream of the bent flow path,
The secondary oil / liquid separation region on the bent flow path side, and an overflow edge that allows the treatment liquid to overflow and move from the primary oil / liquid separation region side to the secondary oil / liquid separation region side, A first partition having, and a second partition partitioning the primary oil-liquid separation region at the upper portion thereof and communicating with each other at the lower portion thereof, and a liquid surface on the upstream side of the second partition wall in the primary oil-liquid separation region. The oil component may be recovered by the oil recovery device from the liquid level in the secondary oil-liquid separation region (claim 2).

In this case, the processing liquid flows into the primary oil / liquid separation area from the liquid inlet, and from the primary oil / liquid separation area, passes through the overflow edge of the first partition wall and the secondary oil / liquid separation area. It flows into the oil-liquid separation area. Then, the processing liquid flowing into the primary oil liquid separation area from the liquid inlet,
It moves from the upstream side of the second partition to the downstream side of the second partition through a lower portion thereof. On the upstream side of the second partition, the oil floating on the liquid surface is recovered by the oil recovery device. Therefore, there is no large oil droplet in the processing liquid moving from the upstream side of the second partition to the downstream side of the second partition through the lower part. In the secondary oil-liquid separation area, while the treatment liquid flows through the bent flow path, the oil recovered from the oil level is recovered by the oil recovery device. Since the bent channel is bent,
The flow path of the processing liquid in the oil-liquid separation tank becomes longer, and as a result, fine oil droplets mixed in the processing liquid reliably float on the liquid surface. Therefore, the treatment liquid can be reliably purified.

In the oil-liquid separation device, an inclined surface extending downward from the overflow edge toward the upstream end of the bent flow path may be provided. With this configuration, the processing liquid flows into the secondary oil liquid separation area gently over the overflow edge, so that the processing liquid in the secondary oil liquid separation area is stirred. This is preferable because fine oil droplets that have floated up are prevented from sinking into the processing liquid again.

Furthermore, if a bubble generating means for generating bubbles from the bottom of the oil-liquid separation tank along the bent flow path is provided (claim 4), it is contained in the processing liquid flowing through the bent flow path. Since the fine air bubbles are adsorbed on the air bubbles and float on the liquid surface, the recovery of the oil content is further ensured.

Further, the partition plate for forming the bent flow path is immersed in the processing liquid when the processing liquid in the oil-liquid separation tank has a predetermined full volume, and the processing liquid is discharged from the liquid outlet. When the liquid comes out and the liquid level falls, the height of the upper end can be reduced (claim 5). With this configuration, when the treatment liquid in the oil-liquid separation tank has a predetermined full volume, that is, when the inflow and the outflow of the treatment liquid to the oil-liquid separation tank are stopped, Since there is no partition on the liquid surface of the secondary oil / liquid separation area, it becomes easier to recover oil from the liquid level of the secondary oil / liquid separation area.

[0014]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of a cleaning device including an oil-liquid separation device according to one embodiment of the present invention. The cleaning device 1 according to the present embodiment is, for example, a device for cleaning a body 2 to be cleaned such as a steel part to which oil has adhered to its surface by a quenching process, that is, an oil component Cleaning device for removing water, and a single cleaning tank 3
And a plurality of cleaning liquid tanks 4, 5, 6 provided in accordance with the number of cleaning steps. In the present embodiment, a rough cleaning step, a main cleaning step, and a rinsing cleaning step are provided as cleaning steps, and the rough cleaning liquid tank 4, the main cleaning liquid tank 5, Three cleaning liquid tanks of the rinse cleaning liquid tank 6 are provided. The cleaning liquid in each of the cleaning liquid tanks 4, 5, and 6 is sequentially supplied to the single cleaning tank to clean the surface of the body 2 to be cleaned, and returned to the original cleaning liquid tanks 4, 5, and 6, respectively. .

The cleaning tank 3 is provided with a body-to-be-cleaned inlet 7 and a body-to-be-cleaned outlet 8 as opening and closing ports for opening and closing the body 2 to be cleaned. Doors 9 and 10 whose mouths 7 and 8 can be freely opened and closed
It becomes a closed state by being closed with.

A shower nozzle 11 for spraying a cleaning liquid onto the object 2 to be cleaned is provided inside the cleaning tank 3.
And a rotary table 13 driven by a prime mover 12 such as an electric motor so that the entire surface of the body 2 to be cleaned can be cleaned. Although not limited, the rotation table 13 is of a type in which the rotation direction changes repeatedly, and the rotation speed can be freely changed.

The cleaning tank 3 has an air blow nozzle 16 connected to an air source 15 via a valve 14. In the liquid draining step after the rinsing cleaning step, the cleaning liquid is removed from the surface of the cleaning target 2 by blowing air from the air blow nozzle 16 onto the cleaning target 2.

A blower 17 is connected to the cleaning tank 3 as a forced air discharging means for forcibly discharging air in the tank. This is to prevent steam from leaking from the cleaning object outlet 8 when the cleaning object 2 is taken out of the cleaning tank 3 and to protect equipment around the cleaning tank 3. That is, in the cleaning tank 3, cleaning is performed with a cleaning solution of warm water in order to obtain a high cleaning effect. Therefore, after the completion of the cleaning step, the cleaning tank 3 is filled with steam. Therefore, after the liquid draining step is completed, or in a steam discharging step performed in parallel with the liquid draining step, the blower 17 is operated to forcibly discharge the steam from the cleaning tank through a steam discharging pipe 18. After discharging, the door 1 of the cleaning object outlet 8 is
Opening the 0 does not allow steam to leak out.

In the lower part of the cleaning tank 3, the object to be cleaned 2 is provided.
A swarf collecting recess 19 for collecting swarf adhered to the surface of the swarf is formed. The swarf collecting recess 19 includes a magnet and a net (not shown) for capturing and collecting the swarf. Is provided.

The cleaning liquid in each of the cleaning liquid tanks 4, 5, 6 is supplied to the cleaning tank 3 by a cleaning liquid pump 20. On the suction port 20a side of the cleaning liquid pump 20,
Rough cleaning liquid introduction valve 21 and main cleaning liquid introduction valve 22
And the three cleaning liquid tanks 4, 5, and 6 are connected to each other via the rinsing cleaning liquid introduction valve 23, respectively. On the other hand, the cleaning tank 3 converts the cleaning liquid supplied from the three cleaning liquid tanks 4, 5, and 6 into the original tanks 4, 5, and 6.
6, the rough cleaning liquid return valve 24 and the main cleaning liquid return valve 2
5 and a rinse cleaning liquid return valve 26 are connected to the three cleaning liquid tanks 4, 5, and 6.

Each of the three cleaning liquid tanks 4, 5, and 6 has an appropriate type of heater for heating the cleaning liquid therein to a temperature at which a high cleaning effect is obtained, for example, about 50 to 90 ° C. 27 are provided.

Further, the three cleaning liquid tanks 4, 5, 6
Are oil-liquid separation devices, each having an oil recovery device 29 of a suitable type known per se. The oil recovery device 29 is provided with the tanks 4, 5, 6 from the washing tank 3.
The oil floating on the liquid surface of the cleaning liquid returned to is recovered, and the cleaning liquid is purified.

In the rough cleaning liquid tank 4, the oil contained in the cleaning liquid naturally floats on the liquid surface, so that the oil is recovered from the liquid surface by the oil recovery device 29, whereby the rough cleaning liquid tank 4 is recovered. The cleaning liquid in the inside is purified.

On the other hand, in the present embodiment, in order to more reliably recover the oil content in the main cleaning liquid tank 5 and the rinsing liquid tank 6 as the oil / liquid separating device, a special liquid as shown in FIGS. The configuration is adopted. The main cleaning liquid tank 5 and the rinse cleaning liquid tank 6 according to the present embodiment have the same configuration as each other, and FIG.
3 is a perspective view and a plan view showing the internal structure of the tanks 5 and 6, respectively. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, and FIGS. It is a front view which shows the state of a surface.

As shown in FIGS. 2 and 3, a first partition 31 is provided inside the tank main body 30 as an oil-liquid separation tank of the main cleaning liquid tank 5 and the rinsing cleaning liquid tank 6.
And a second partition 32 are provided. The first partition 31
As a result, a primary oil / liquid separation area 33 and a secondary oil / liquid separation area 34 are defined in the tank body 30. The first partition wall 31 has an overflow edge 35 that allows the cleaning liquid L as a processing liquid to overflow and move from the primary oil liquid separation area 33 to the secondary oil liquid separation area 34.
The overflow edge 35 defines the highest water level of the primary oil / liquid separation area 33.

As shown in FIG. 4, the first partition 31 is
Inclined surface 37 extending downward from the overflow edge 35 toward the upstream end 36 of the secondary oil liquid separation area 34
Therefore, the cleaning liquid L overflowing from the overflow edge 35 flows along the inclined surface 37 and flows into the secondary oil liquid separation area 34 quietly.

On the other hand, as shown in FIG. 2, the second partition 32 allows the primary oil / liquid separation region 33 to communicate with each other at a lower portion thereof and partitions the upper portion thereof at an upper portion thereof. The primary oil / liquid separation region 33 is divided into an upstream region 33a and a downstream region 33b which communicate with each other at a lower portion thereof. From the liquid inlet 38 of the tank body 30 to the upstream area 33a
The cleaning liquid L having flowed into the first partition wall 31 flows into the downstream region 33b between the first partition wall 31 and the first partition wall 31 through the communication port 39 formed below the second partition wall 32.

The oil recovery device 29 is connected to the upstream region 33a of the primary oil liquid separation region 33. In the upstream area 33a, large oil droplets contained in the dirty cleaning liquid L float on the liquid surface and are collected by the oil recovery device 29. Therefore, the cleaning liquid containing no large oil droplets is accumulated in the lower part of the upstream region 33a. The cleaning liquid not containing the large oil droplets passes through the lower communication port 39 to the downstream region 33b. L will flow in.

On the other hand, as shown in FIGS. 2 and 3, a bent flow path 40 is formed in the secondary oil liquid separation area 34,
A liquid outlet 42 is formed at the downstream end 41 of the bent channel 40 and at the lower part of the tank body 30. By providing the bent flow path 40, the flow path of the cleaning liquid L in the secondary oil liquid separation area 34 becomes longer.
The time required for the fine oil droplets contained therein to float on the liquid surface can be increased, and the oil-liquid separation effect in the secondary oil-liquid separation region 34 can be improved.

In the present embodiment, as clearly shown in FIG. 3, a plurality of, specifically six, bent channel forming partition plates 43 are provided adjacent to the secondary oil liquid separation area 34. The bent channels 40 are formed in a meandering shape, but are not limited thereto. For example, the partition plate extends in a spiral shape when viewed from above. May be arranged in the secondary oil-liquid separation region, and the curved flow path may be formed in a spiral shape.

As shown in FIG. 5, the height of each of the curved flow path forming partition plates 43 is such that when the washing liquid L is fully stored in the tank body 30 and the predetermined full water amount is reached.
When the cleaning liquid L flows out of the liquid outlet 42 and the liquid level of the secondary oil liquid separation area 34 falls as shown in FIG. The height is exposed.

As shown in FIGS. 2 and 3, the secondary oil liquid separation area 34 is provided with an air discharge pipe 45 which constitutes bubble generating means together with an air pump 44 (see FIG. 1). The air discharge pipe 45 is arranged on the bottom surface of the tank body 30 so as to extend along the bent flow path 40. The air discharge pipe 45 is formed with a number of small air discharge holes 46 at equal intervals along the length direction thereof. The fine air bubbles rise from the bottom of the tank main body 30 along the curved flow path 40 by the air supplied to the tank (see FIG. 5). These fine bubbles cause fine oil droplets contained in the cleaning liquid L to float on the liquid surface.

As shown in FIGS. 5 and 6, the oil recovery device 29 is connected to the secondary oil / liquid separation region 34 as well as the primary oil / liquid separation region 33. The fine oil droplets floating on the liquid surface of the secondary oil-liquid separation area 34,
The oil is collected by the oil collecting device 29. For this reason,
From the liquid outlet 42, a clean washing liquid from which oil has been sufficiently removed flows out. As described above, since the liquid outlet 42 is formed at the lower portion of the tank body 30, fine oil droplets floating on the liquid surface do not flow out of the liquid outlet 42.

The cleaning device according to the present embodiment is used as follows.

The cleaning operation step proceeds in the order of a rough cleaning step, a main cleaning step, a rinsing cleaning step, a liquid draining step, and a steam discharging step.

In FIG. 1, the door 9 of the cleaning object loading port 7 is opened, the cleaning object 2 is loaded into the cleaning tank 3, and is placed on the rotary table 13. Close.
Then, the washing tank 3 is sealed. The rotation table 13 repeats the forward rotation and the reverse rotation from the start of the rough cleaning step to the end of the liquid removing step with the object to be cleaned 2 placed thereon.

The rough cleaning step is as follows.

When the rough cleaning liquid introduction valve 21 and the rough cleaning liquid return valve 24 are opened and the cleaning liquid pump 20 starts operating, the cleaning liquid L in the rough cleaning liquid tank 4 is jetted from the shower nozzle 11, and It sprays on the to-be-cleaned body 2. As a result, the oil adhering to the surface of the object to be cleaned 2 is washed away. The body to be cleaned 2
Is rotated by the rotary table 13 so that the cleaning liquid L hits the entire surface thereof, and the entire surface is cleaned. The cleaning liquid L that has washed the cleaning target body 2 naturally flows down from the chip recovery recess 19 and returns to the rough cleaning liquid tank 4.

When the rough cleaning for a predetermined time is completed, the cleaning liquid pump 20 is stopped, and the rough cleaning liquid introduction valve 21 and the rough cleaning liquid return valve 24 are both closed.
The rough cleaning process ends.

The cleaning liquid L returned from the cleaning tank 3 to the rough cleaning liquid tank 4 contains a large amount of oil adhering to the surface of the object 2 to be cleaned. In the cleaning liquid tank 4, the cleaning liquid L naturally rises to the liquid surface, and the cleaning liquid L in the rough cleaning liquid tank 4 is next involved in cleaning, that is, until the next rough cleaning step is started. The oil is collected by the oil collecting device 29.

The main cleaning step is as follows.

When the main cleaning liquid introduction valve 22 is opened and the cleaning liquid pump 20 starts operating, the cleaning liquid L in the main cleaning liquid tank 5 is jetted from the shower nozzle 11 and blows onto the body 2 to be cleaned. As a result, the oil adhering to the surface of the object to be cleaned 2 is washed away. At this time, since the main cleaning liquid return valve 25 is closed, the level of the cleaning liquid L in the cleaning tank 3 eventually rises, and the body 2 to be cleaned sinks in the cleaning liquid. Since the object to be cleaned 2 is rotated by the rotary table 13 in reverse, the object to be cleaned 2 is cleaned in a dipped state.

When the main cleaning for a predetermined time is completed, the cleaning liquid pump 20 is stopped, the main cleaning liquid introduction valve 22 is closed, and the main cleaning liquid return valve 25 is opened.
As a result, the cleaning liquid L accumulated in the cleaning tank 3
However, it naturally flows down from the chip recovery recess 19 and returns to the main cleaning liquid tank 5, and the main cleaning step is completed.

The cleaning liquid L returned from the cleaning tank 3 is
In the main cleaning liquid tank 5, the oil is recovered by the oil recovery device 29 until the next main cleaning step, that is, before the next main cleaning step is started. Specifically, as shown in FIG. 2, the cleaning liquid L returned from the cleaning tank 3 flows from the upstream area 33 a of the primary oil liquid separation area 33 through the lower communication port 39 to the downstream side. It moves to the area 33 b, overflows from the overflow end 35, flows on the inclined surface 37, and flows to the upstream end 36 of the secondary oil / liquid separation area 34, that is, to the upstream end 36 of the bent flow path 40. And move quietly. In the upstream region 33 a of the primary oil / liquid separation region 33, large oil droplets contained in the cleaning liquid L float on the liquid surface, and this oil is collected by the oil recovery device 29.

In the secondary oil / liquid separation area 34, the air pump 44 is operated and the air discharge pipe 45
Air is released from the Thereby, the tank body 3
The fine bubbles rise from the bottom surface of the cleaning liquid L, and are adsorbed by the fine bubbles, so that the fine oil droplets in the cleaning liquid L reliably float on the liquid surface. The oil floating on the liquid surface is collected by the oil collecting device 29.

The rinsing step is as follows.

In FIG. 1, when the rinse cleaning liquid introduction valve 23 and the rinse cleaning liquid return valve 26 are opened and the cleaning liquid pump 20 starts operating, the cleaning liquid L in the rinse cleaning liquid tank 6 is discharged from the shower nozzle 11. It is sprayed and sprays on the object to be cleaned 2. As a result, the oil adhering to the surface of the object to be cleaned 2 is washed away. Since the object to be cleaned 2 is turned by the rotary table 13, the cleaning liquid L hits the entire surface thereof, and the entire surface is cleaned. The cleaning liquid L that has washed the cleaning target body 2 naturally flows down from the chip recovery recess 19 and returns to the rinse cleaning liquid tank 6.

During the rinsing cleaning step, the cleaning liquid L in the rinsing liquid tank 6 circulates between the rinsing tank 3 and oil in the rinsing liquid tank 6.
That is, at the beginning of the rinsing cleaning step, as shown in FIG. 6, in the rinsing cleaning liquid tank 6, the cleaning liquid L in the secondary oil liquid separation area 34 is sent from the liquid outlet 42 to the cleaning tank 3. Thus, the liquid level in the secondary oil / liquid separation area 34 falls. Then, the bent channel forming partition plate 43 is formed.
The upper end of the secondary oil-liquid separation area 34 is exposed from the liquid surface.
Then, the bent flow path 40 appears. The lowering of the liquid level in the secondary oil / liquid separation area 34 continues until the cleaning liquid L starts to return from the cleaning tank 3 to the rinse cleaning liquid tank 6.

The cleaning liquid L that has reached the cleaning tank 3 and has come into contact with the cleaning target 2 flows down naturally due to the height difference between the cleaning tank 3 and the rinsing liquid tank 6, and the liquid in the rinsing liquid tank 6 From the inlet 38, it flows into the upstream area 33a of the primary oil / liquid separation area 33. In the upstream area 33a, large oil droplets contained in the cleaning liquid L float on the liquid surface, and the large oil droplets
Will be recovered by

In the lower part of the upstream area 33a of the primary oil liquid separation area 33, there is a cleaning liquid L that does not contain the large oil droplets.
9 to the downstream area 33b, overflows from the overflow end 35 and flows on the inclined surface 37, and the upstream end 36 of the secondary oil / liquid separation area 34, that is, the bent flow path It moves gently to the upstream end 36 of 40.

In the secondary oil liquid separation area 34, the cleaning liquid L moves along the bent flow path 40, and the cleaning liquid L
Is continuously sent out from the liquid outlet 42 to the cleaning tank 3. Such circulation of the cleaning liquid L continues until the end of the rinsing cleaning step. In the secondary oil liquid separation area 34, while the cleaning liquid L moves along the curved flow path 40, fine oil droplets contained in the cleaning liquid L float on the liquid surface. Since the flow path is elongated by bending and extending, it takes time for the cleaning liquid L to reach the downstream end portion 41. Therefore, the time required for the fine oil droplets to sufficiently float on the liquid surface can be secured, and the cleaning effect of the cleaning liquid L is enhanced. The fine oil droplets floating on the liquid surface are collected by the oil collecting device 29.

When the rinsing cleaning for a predetermined time is completed, the cleaning liquid pump 20 is stopped, the rinsing cleaning liquid introduction valve 23 and the rinsing cleaning liquid return valve 26 are both closed, and the rinsing cleaning step is completed. At the end of the rinsing step, all the cleaning liquid L has returned from the cleaning tank 3 to the rinsing liquid tank 6, so that the liquid level in the secondary oil liquid separation area 34 is in its original state, ie, as shown in FIG. As shown in the figure, the upper end portion of the bent channel forming partition plate 43 has returned to the sunk state.

After the rinsing cleaning step is completed, the oil recovery is performed in the rinsing cleaning liquid tank 6 until the cleaning liquid L participates in the next cleaning, that is, before the next rinsing cleaning step starts. Purified by the device 29. Specifically, in the primary oil-liquid separation region 33, the oil that has naturally floated on the liquid surface is collected by the oil recovery device 29.

On the other hand, in the secondary oil / liquid separation area 34, the air pump 44 operates to discharge air from the air discharge pipe 45. Accordingly, fine bubbles rise from the bottom surface of the tank main body 30 and are adsorbed by the fine bubbles, so that fine oil droplets in the cleaning liquid L reliably float on the liquid surface. The oil that floats on the liquid surface is collected by the oil recovery device 2.
9 to be collected.

When the three washing steps are completed as described above, the draining step is started. That is, in FIG. 1, air is blown from the air blow nozzle 16 toward the cleaning target 2, and moisture adhering to the surface of the cleaning target 2 is removed. Since the object to be cleaned 2 is turned by the rotating table 13 in reverse,
Air is blown all over the surface, and the entire surface dries efficiently.

After or concurrently with the draining step, the blower 17 starts operating as a steam discharging step, and the steam in the cleaning tank 3 is discharged by the steam discharging pipe 1.
It is forcibly ejected through 8.

Thereafter, the door 10 of the cleaning object taking-out opening 8 is opened, and the cleaning object 2 is taken out. At this time, since no steam exists in the cleaning tank 3, there is no adverse effect on peripheral devices due to the outflow of the steam.

In the above description, the rough cleaning step is performed by the shower cleaning method, the main cleaning step is performed by the immersion cleaning method, and the rinsing cleaning step is performed by the shower cleaning method.
The washing method in each step can be appropriately selected from a plurality of washing methods known per se, such as a shower washing method, an immersion washing method, and an air bubbling method.

The cleaning liquid purifying method in the main cleaning liquid tank 5 and the cleaning liquid purifying method in the rinsing cleaning liquid tank 6 can be interchanged with each other, or can be adjusted to any one of the methods. The rough cleaning liquid tank 4 is configured similarly to the main cleaning liquid tank 5 and the rinsing cleaning liquid tank 6.
It is also possible to purify the rough cleaning liquid in the same manner as the cleaning liquid in the inside.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a cleaning device including an oil-liquid separation device according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the internal structure of a main cleaning liquid tank and a rinse cleaning liquid tank as an oil liquid separation device according to one embodiment of the present invention.

FIG. 3 is a plan view showing the internal structure of a main cleaning liquid tank and a rinse cleaning liquid tank.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a front view showing a state of a liquid level during a non-cleaning operation of the rinse liquid tank.

FIG. 6 is a front view showing the state of the liquid level during the cleaning operation of the rinse cleaning liquid tank.

[Explanation of symbols]

 Reference Signs List 29 oil recovery device 30 tank main body (oil-liquid separation tank) 31 first partition wall 32 second partition wall 33 primary oil-liquid separation region 34 secondary oil-liquid separation region 35 overflow edge 36 upstream end of bent channel 37 inclined surface 38 Liquid inlet 40 Bent flow path 41 Downstream end of bent flow path 42 Liquid outlet 43 Bending flow path forming partition plate 45 Air discharge pipe (bubble generating means) L Treatment liquid

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B08B 3/08 B08B 3/08 Z C02F 1/24 C02F 1/24 D (72) Inventor Tomonori Kansugi Tokyo 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. 1-8-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Dowa Mining Co., Ltd.

Claims (5)

[Claims] An oil-liquid separation tank having a liquid inlet and a liquid outlet; a bent flow path formed inside the oil-liquid separation tank for communicating the liquid inlet and the liquid outlet with each other; An oil recovery device that recovers oil from the liquid surface of the processing liquid in the separation tank, wherein the liquid outlet is formed at a downstream end of the bent flow path and at a lower portion of the oil liquid separation tank. , Oil-liquid separator. 2. The oil-liquid separation tank is partitioned into a primary oil-liquid separation area upstream of the bent flow path and a secondary oil-liquid separation area on the bent flow path side, and the oil-liquid separation tank is separated from the primary oil-liquid separation area. A first partition wall having an overflow edge that allows the processing liquid to overflow and move to the secondary oil / liquid separation region side, and the primary oil / liquid separation region communicates with each other at a lower portion thereof and at an upper portion thereof. A second partition for partitioning, and an oil component is recovered by the oil recovery device from a liquid surface on the upstream side of the second partition in the primary oil-liquid separation region and a liquid surface of the secondary oil-liquid separation region. The oil-liquid separation device according to claim 1, which is configured as described above. 3. The oil-liquid separation device according to claim 1, further comprising an inclined surface extending downward from the overflow edge toward an upstream end of the bent flow path. 4. The oil-liquid separation device according to claim 1, further comprising a bubble generation means for generating bubbles from the bottom of the oil-liquid separation tank along the bent flow path. 5. A partition plate for forming the bent flow path,
When the treatment liquid in the oil-liquid separation tank has a predetermined full volume, the treatment liquid is submerged in the treatment liquid, and the treatment liquid comes out from the liquid outlet and the liquid surface is lowered, thereby exposing the upper end portion. The oil-liquid separator according to claim 1, 2, 3, or 4, wherein the oil-liquid separator has a height.