JP7084626B2 - Deteriorated rinse water regenerator and cleaning equipment - Google Patents

Description

The present invention relates to a deteriorated rinse water regenerating device and a cleaning device for regenerating deteriorated rinse water used for cleaning processed products such as various mechanical parts.

Since various processing oils are used for processing machine parts and the like, it is necessary to wash the processed products to remove the processing oils. The cleaning agents used in the cleaning step are generally classified into water-based cleaning agents, non-water-based cleaning agents, and quasi-water-based cleaning agents. Of these, water-based detergents are usually composed of inorganic / organic builders, surfactants, chelating agents, rust preventives, etc., and are provided in the form of concentrated liquids or powders, and are diluted with water about 10 to 100 times. Is used.

The water-based cleaning agent has the advantages of not being flammable or explosive, being able to remove solid stains, having extremely low toxicity, and having a low running cost.
In addition, the water-based cleaning agent has an advantage that it is compatible with ultrasonic cleaning. Ultrasonic cleaning is a cleaning method in which an ultrasonic vibrator is placed in a cleaning tank to generate ultrasonic vibrations, and oil stains can be stripped off including details of the workpiece by the cavitation effect.

However, in ultrasonic cleaning, the emulsification and dispersion of the processing oil is promoted by ultrasonic vibration, so that the removal of the emulsified processing oil becomes a big problem. In Patent Document 1, after cleaning using a cleaning liquid obtained by diluting an alkaline cleaning agent or a neutral cleaning agent with water, the used cleaning liquid is circulated through a hollow thread film to remove emulsified processing oil, and the cleaning liquid is regenerated. The system is described.

On the other hand, in an actual cleaning device, there are a step of rinsing the object to be cleaned after cleaning the object to be cleaned such as machine parts with a cleaning liquid, and a final drying step. In the rinsing process, water (rinse water) or rust-preventive water (rinse water with rust-preventive agent added) (hereinafter collectively referred to as "rinse water") is used to remove the emulsified processed oil that has adhered to and remains on the object to be cleaned. Remove.
However, since the processed oil is contained in the deteriorated rinse water after rinsing in an emulsified state, repeated use of the same rinse water may deteriorate the cleaning quality. Further, it is not preferable from the environmental point of view to discharge the deteriorated rinse water as it is to the outside of the system. Therefore, it is required to reduce the concentration of the processing oil in the deteriorated rinse water from the viewpoint of maintaining the cleaning quality and the environment, such as suppressing the carry-out of the processing oil to the next process.

Japanese Patent No. 6298603

An object of the present invention is to provide a deteriorated rinse water regenerating device and a cleaning device capable of removing emulsified processing oil from deteriorated rinse water with high efficiency and regenerating the rinse water.

The deteriorated rinse water regenerator of the present invention for solving the above problems is connected to a circulation path, a ceramic separation membrane module for regenerating deteriorated rinse water, a concentration tank connected to the ceramic separation membrane module by a circulation path, and a circulation path. A supply path for supplying the deteriorated rinse water discharged from the washing tank to the circulation path, and a liquid feed pump for circulating the deteriorated rinse water between the ceramic separation membrane module and the concentration tank through the circulation path. It is characterized by having a return path for returning the regenerated rinse water separated from the ceramic separation membrane module to the washing tank in the process of circulating the deteriorated rinse water.

The cleaning device of the present invention includes the deteriorated rinse water regeneration device.

According to the present invention, the emulsified processing oil can be removed from the deteriorated rinse water with high efficiency to regenerate the rinse water, so that the rinse water can be repeatedly used without replacement and maintains high cleaning quality. However, it also has the effect of being excellent in terms of the environment.

It is a block diagram which shows the deteriorated rinse water regeneration apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the outline of the cleaning apparatus which concerns on one Embodiment of this invention.

A deteriorated rinse water regenerating device (hereinafter, may be simply referred to as a regenerating device) according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the regenerating device 1 includes a ceramic separation film module 4 for regenerating deteriorated rinse water discharged from a cleaning tank 2 for rinsing an object to be cleaned via a supply path 3, and the ceramic separation. It is provided with a concentration tank 5 for accommodating deteriorated rinse water that has passed through the membrane module 4.

An ultrasonic vibrator (US) 6 is installed in the cleaning tank 2, and the object to be cleaned, which has been cleaned with the cleaning liquid in the cleaning step which is the previous step, is rinsed by ultrasonic cleaning. The rinse water contained in the washing tank 2 is mainly water or a mixture of water with a rust preventive, a chelating agent, etc., and the purpose is to remove the emulsified processed oil adhering to the object to be washed in the washing step. do.

Examples of the cleaning liquid include a water-based cleaning liquid containing an alkaline cleaning agent or a neutral cleaning agent. Alkaline cleaning agents are generally used as water-based cleaning agents for metals, and are mainly composed of inorganic builders such as alkali metal hydroxides and water-soluble alkali metal salts, and surfactants and chelating agents. It contains, and is usually used by diluting it with water about 10 to 100 times.

The ceramic separation membrane module 4 contains a cylindrical ceramic porous membrane (not shown) in a casing. Examples of the ceramic porous membrane include porous membranes such as alumina, mullite, and titania. These ceramic porous membranes function as microfiltration membranes or ultrafiltration membranes, and are preferably ultrafiltration membranes. Further, the regeneration is performed by a so-called cross-flow method in which the liquid to be treated is introduced into the cylinder of the ceramic porous membrane and flows in parallel with the membrane surface.

In order to filter the deteriorated rinse water and remove the emulsified processing oil contained in the deteriorated rinse water, the ceramic porous membrane to be used has a pore size of 1 to 200 nm, preferably about 5 to 100 nm.

Further, the ceramic separation membrane module 4 preferably accommodates a plurality of tubular ceramic porous membranes in one casing. Further, a plurality of ceramic separation membrane modules 4 may be arranged in parallel so that the deteriorated rinse water flows into the inlet of each ceramic separation membrane module 4.

The ceramic separation membrane module 4 and the concentration tank 5 are connected by circulation paths 10a and 10b. The circulation path 10a connects the downstream outlet of the concentration tank 5 and the upstream inlet of the ceramic separation membrane module 4. On the other hand, the circulation path 10b connects the downstream outlet of the ceramic separation membrane module 4 and the upstream inlet of the concentration tank 5, and sends the deteriorated rinse water that has passed through the ceramic separation membrane module 4 to the concentration tank 5. ..

The deteriorated rinse water contained in the concentration tank 5 is sent to the ceramic separation membrane module 4 again through the circulation path 10a, the residual emulsifying oil is removed, and the rinse water is regenerated. The regenerated rinse water separated from the ceramic separation membrane module 4 is returned to the washing tank 2 by the return passage 13. On the other hand, since the deteriorated rinse water containing the emulsified processed oil concentrated by repeated circulation is accumulated in the concentration tank 5, a discharge path 14 for discarding the deteriorated rinse water is provided.

A liquid feeding pump 9 is provided in the circulation path 10a. A supply path 3 for supplying the deteriorated rinse water discharged from the washing tank 2 is connected to the circulation path 10a on the upstream side of the liquid transfer pump 9.
A three-way valve 11 is provided in the supply path 3, and one end of the bypass path 12 is connected to the three-way valve 11. The other end of the bypass path 12 is connected to the return path 13. Further, the supply path 3 is provided with a filter 18 for removing foreign matter. Although the filter 18 is provided on the downstream side of the three-way valve 11, it may be provided on the upstream side of the three-way valve 11.

Next, a method for regenerating the deteriorated rinse water using the regenerating device 1 according to the present embodiment will be described.
In the washing tank 2, a large number of objects to be washed are rinsed with rinse water. Rinse water that has deteriorated after long-term use contains emulsified processing oil separated from the object to be cleaned. Such deteriorated rinse water is discharged to the overflow tank 7 attached to the washing tank 2, and is sent from the overflow tank 7 to the regeneration device 1 through the supply path 3.

The deteriorated rinse water sent to the regenerating device 1 is supplied to the ceramic separation membrane module 4. The supply of the deteriorated rinse water to the ceramic separation membrane module 4 is performed by pressurizing the liquid feed pump 9. At this time, the pressure applied to the inlet of the ceramic separation membrane module 4, the flow rate of the supplied liquid, and the like may be appropriately set so as to optimize the regeneration efficiency.

In the ceramic separation membrane module 4, after separating the regenerated rinse water from the deteriorated rinse water by the cross flow method, the discharged deteriorated rinse water is sent to the concentration tank 5 through the circulation path 10b, and further separated from the circulation path 10a by the ceramic. It is sent to the membrane module 4. As a result, the deteriorated rinse water is circulated between the ceramic separation membrane module 4 and the concentration tank 5 by the liquid feed pump 9, and the regenerated rinse water is separated from the deteriorated rinse water.
On the other hand, the regenerated rinse water separated from the deteriorated rinse water in the ceramic separation membrane module 4 is returned to the washing tank 2 through the return passage 13.

As described above, in the regeneration of the deteriorated rinse water, the deteriorated rinse water is circulated between the ceramic separation membrane module 4 and the concentration tank 5, and the deteriorated rinse discharged from the washing tank 2 into the circulation paths 10a and 10b. Water is supplied via the supply channel 3.
The three-way valve 11 provided in the supply path 3 is switched to stop the supply of the deteriorated rinse water from the washing tank 2 to the regenerating device 1, and the circulation between the ceramic separation membrane module 4 and the concentration tank 5 in that state. You may want to do only. On the contrary, the circulation 10a may be provided with an on-off valve (not shown) to stop the circulation and supply only the deteriorated rinse water from the washing tank 2 to the regenerating device 1.

By circulating the deteriorated rinse water discharged from the ceramic separation membrane module 4 between the ceramic separation membrane module 4 and the concentration tank 5, the concentration of the emulsifying processing oil in the concentration tank 5 is gradually concentrated and increased. When the predetermined concentration is reached, it is necessary to dispose of the deteriorated rinse water in the concentration tank 5 from the discharge channel 14. In addition, it is necessary to periodically replace the tubular ceramic porous membrane in the ceramic separation membrane module 4.
In such a case, the deteriorated rinse water discharged from the washing tank 2 is circulated from the three-way valve 11 to the washing tank 2 from the return passage 13 via the bypass passage 12.

In the above embodiment, the deteriorated rinse water discharged from the washing tank 2 is first supplied to the ceramic separation membrane module 4, but the present invention is not limited to this, and the deteriorated rinse water is first supplied. It may be supplied to the concentration tank 5 through the circulation path 10a and then to the ceramic separation membrane module 4 through the circulation path 10b. In that case, the liquid feed pump 9 is preferably provided in the circulation path 10b.
That is, the deteriorated rinse water can be regenerated in the same manner as in the above embodiment except that the flow direction of the deteriorated rinse water passing through the circulation paths 10a and 10b is opposite to that in the above embodiment.

As shown in FIG. 2, the cleaning apparatus of the present invention has a cleaning tank 15 for cleaning an object to be cleaned such as a mechanical part with a cleaning solution containing an alkaline cleaning agent, and a cleaning agent from the cleaning object washed in the cleaning tank 15. A washing tank 2 for rinsing to remove components, emulsifying processing oil, and the like, and a drying tank 16 for drying the rinsed object to be washed are provided. The washing tank 2 includes the deteriorated rinse water regeneration device 1 described above.
Further, it is preferable that the cleaning tank 15 is provided with a cleaning liquid regenerating device 17. As the cleaning liquid regenerating device 17, for example, as described in Patent Document 1, a device provided with a hollow fiber membrane module using a hollow fiber membrane can be used.

Since the regenerating device 1 of the present invention and the cleaning device provided with the regenerating device 1 separate the emulsified processed oil separated from the object to be cleaned from the deteriorated rinse water and regenerate it, the rinse water is repeatedly used without replacement. be able to.

Although the regenerating device 1 according to the embodiment of the present invention and the cleaning device provided with the regenerating device 1 have been described above, the regenerating device 1 and the cleaning device of the present invention are not limited to the above-described embodiment.

1 Regeneration device 2 Cleaning tank 3 Supply path 4 Ceramic separation membrane module 5 Concentration tank 6 Ultrasonic oscillator 7 Overflow part 9 Liquid feed pump 10a, 10b Circulation path 11 Three-way valve 12 Bypass path 13 Return path 14 Discharge channel 15 Cleaning tank 16 Drying tank 17 Cleaning liquid regeneration device 18 Filter

Claims (5)

Ceramic separation membrane module for regenerating degraded rinse water,
A concentration tank connected to the ceramic separation membrane module by a circulation path,
A supply path connected to the circulation path and supplying the deteriorated rinse water discharged from the washing tank to the circulation path,
A liquid feed pump that circulates the deteriorated rinse water between the ceramic separation membrane module and the concentration tank through the circulation path.
A return path for returning the regenerated rinse water separated from the ceramic separation membrane module to the washing tank in the process of circulating the deteriorated rinse water.
A bypass path connecting the supply path and the return path is provided .
The deteriorated rinse water regeneration device , wherein the supply path can be switched between a flow path to the return path passing through the bypass path and a flow path to the ceramic separation membrane module . The deteriorated rinse water regeneration device according to claim 1, wherein the ceramic separation membrane module contains a membrane element including a tubular ceramic porous membrane in a casing. The deteriorated rinse water regeneration device according to claim 2, wherein the ceramic porous membrane is a microfiltration membrane or an ultrafiltration membrane. The deteriorated rinse water regenerator according to claim 2 or 3, wherein the ceramic porous membrane has a pore size of 1 to 200 nm. A cleaning device provided with the deteriorated rinse water regeneration device according to any one of claims 1 to 4.

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