JPS59166203A - Distillation equipment for solvent cleaning apparatus - Google Patents

Abstract

PURPOSE:To obtain the constant quality of a distillation solvent by providing multistage accumulating parts having a heating source for evaporating a cleaning solvent in a main body of a distillation equipment, supplying the cleaning solvent from the accumulating parts of the uppermost stage, and sicharging the concentrated liquid from the accumulating part of the lowermost stage. CONSTITUTION:The solvent to be distilled is introduced into a rotary disk 9 from an intake 13 for a solvent to be distilled through an introducing pipe 8a. The thin film is formed on the surface by rotating the rotary disk 9, and the solvent is heated and evaporated by an electric heater 9a. The vapor, passing through a solvent vapor discharging port 14 as shown with a dotted line and arrows, cooled, condensed in a cooling coil 15, and is discharged through a discharging pipe 8b. The concentrated foreign matter such as oil accumulated at the bottom 8c is discharged from a discharge valve 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a distiller that maintains the solvent in the solvent cleaning device clean by distilling the solvent contaminated by the object to be cleaned in the solvent cleaning device. be.

Prior art solvent cleaning equipment has been used to clean oil-contaminated precision equipment (e.g.
This is a device that removes oil from CX electronic devices, liquid crystal panels, pumps, etc. by immersing them in a cleaning solvent such as chlorofluorocarbons and trichlorene, and its structure is as shown in Figure 1.
Assembly of cleaning device main body 1 and distiller 2, cleaning device main body 1
Inside is 3 degrees hot tub and 4 degrees cold bath. It consists of three tanks, one paper tank 5. The object to be cleaned (work) is immersed in a hot bath 3, a cold bath 4, and a paper bath 5, cleaned, dried, and taken out. Since the inside of the hot tub 3 is most contaminated by foreign substances such as oil brought in by the work, the solvent inside the hot tub 3 is led to the distiller 2, heated by the heater 6, evaporates the solvent, and condensed in the cooling spiral pipe 7. This is a circuit for returning the distilled solvent to the cold bath 4. When operating a cleaning device with this configuration,
Foreign substances such as oil in the solvent liquid in the distiller 2 increase with time, and the concentration of foreign substances such as oil in the solvent liquid in the distiller 2 increases.
Oil and the like float on the surface of the solvent, and the solvent vapor that evaporates on the surface of the heater 6 ruptures on the oil surface, causing so-called entrainment in which the oil and the like are scattered together with the solvent when it evaporates. To explain this using one specific example, when the oil concentration in the distiller 2 becomes 40 to 50%, the oil concentration in the distillation solvent will change from 10 mfil/l to 40 m9.
/13, and the solvent cleanliness inside the cleaning device main body 1 is also poor, making it necessary to replace the solvent. Therefore, when updating, there was a problem of high solvent costs and damage to the walls.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide a distiller in a solvent cleaning apparatus which can maintain a constant quality of the distilled solvent, greatly extend the time interval for renewing the solvent, and reduce the cost of the solvent.

Composition of the Invention In order to achieve the above object, the present invention has the following composition:
The solvent evaporation reservoirs provided in the distiller main body are arranged in multiple stages, and the cleaning agent introduction pipe is opened above the evaporation reservoir at the top stage, and the concentrated liquid is opened below the evaporation reservoir at the bottom stage. It is characterized by having a storage section.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a first embodiment of the present invention, in which reference numeral 8 denotes a distiller main body, and an introduction pipe 8a that introduces the solvent to be distilled from a hot bath (not shown) and the solvent after distillation are shown. It is connected to a discharge pipe 8b that discharges to a cooling tank that is not in use. Reference numeral 9 denotes a rotating disk having a U-shaped cross section for evaporating the solvent, and a T-thermal heater 9a for heating the solvent is attached to the bottom of the rotating disk 9. The rotating disks 9 are arranged in multiple stages, for example, in three stages, and each disc 9 is connected to a common rotating shaft 10.
This rotating shaft lO is fixed horizontally to the pulley 1
Rotation is applied by a motor 12 via a motor 1. Reference numeral 13 denotes a distilled solvent inlet for introducing the distilled solvent to the rotating disks 9, and is opened in the center of the tray 13a disposed above each disk 9. Reference numeral 14 denotes a solvent vapor discharge port that guides the solvent vapor evaporated on the rotating disk 9 upward;
They are arranged and fixed in a zigzag pattern around the periphery of a, with their positions alternately shifted left and right. Reference numeral 15 denotes a cooling corrugated pipe fixed to the upper part of the distiller main body 8, which condenses the solvent vapor evaporated on the rotating disk 9. Reference numeral 16 denotes a discharge valve provided at the bottom of the distiller main body 8, which is used to discharge foreign substances such as oil concentrated and stored at the bottom of the main body 8. 17
17m is a concentrating tank installed at the bottom of the main body 8 to accommodate foreign substances such as oil, and 17m is an electric heater installed in this concentrating tank 17 to further concentrate the solvent to be distilled in the concentrating tank (80 to 90 m).
0%) Both 9 are designed to prevent foreign substances such as concentrated oil from solidifying. .

The operation of this embodiment having the above configuration is as follows.

Driving the motor 12 to rotate the pulley 11 and rotating shaft 1
0, while the solvent to be distilled from the hot tub (not shown) is introduced into the rotating disk 9 from the distillation solvent inlet 13 via the introduction pipe 8a. At this time, the solvent to be distilled is supplied in an excess amount that cannot be evaporated by one rotating disk 9, and the solvent to be distilled that cannot be evaporated by the first rotating disk 9 overflows and is transferred to the next stage. The water flows into the two-stage rotating disk 9, and in the same manner, it sequentially flows into the lower-stage rotating disk 9.

The solvent to be distilled introduced into the first-stage rotating disk 9 spreads from the center to the periphery due to the centrifugal force accompanying the rotation of the rotating disk, forming a thin film, and the rotating disk 9 is heated by the electric heater 9a. As a result, evaporation begins on the surface of the disk 9 and becomes solvent vapor. As shown by the solid line arrow in FIG. introduced in 9. Here, the solvent to be distilled is again evaporated, and the solvent to be distilled that has not been evaporated is introduced into the third stage rotating disk 9 in the same manner. - In this way, the solvent to be distilled that has not been completely evaporated on the rotating disk 9 and has overflowed flows into the lower rotating disk 9 one after another, and flows into each of the first, second, and third rotating disks 9. The concentration of oil, etc. increases as it goes to the bottom, and the concentration of oil, etc.
The concentration of oil, etc. in the solvent in No. 7 is the highest.

On the other hand, the solvent vapor to be distilled that has evaporated in the rotating disk 9 moves upward through the solvent vapor discharge port 14, as shown by the broken line arrow in FIG. The water is then supplied to a cold bath (not shown).

In this embodiment, since the rotating disk 9 applies the central force to the distilled solvent FC14, the solvent flows on the disk 9, reducing the film thickness and increasing the thermal conductivity, compared to the conventional device. It is also possible to increase the amount of distillation.

According to this embodiment, the oil concentration at the bottom of the distillation main body 8 is 80% because the hot bath liquid, which is the solvent to be distilled, is not allowed to flow directly into the concentrated liquid in the concentration tank 17 as in the conventional apparatus. However, a highly clean distillate with an oil concentration of 10 mg/l or less was obtained. Therefore, in conventional equipment, the oil concentration is 40 to 50%.
In contrast, in this embodiment, even if the oil concentration at the bottom of the distiller body 8 is 80%, there is no need to replace the solvent, and it is necessary to extract the concentrated liquid from the discharge pulp 16. However, the amount of solvent bone was significantly reduced. In addition to this, the number of rotating disks 9 (number of stages)
By increasing the number of rotations of the rotating disk 9, the amount of distillation can be easily increased.

FIG. 3 shows a second embodiment of the present invention. This embodiment differs from the first embodiment in that hot water is used as the heating source for the rotating disk 9 instead of an electric heater. That is, as shown in the figure, a hot water circuit 18 is constructed inside the rotating disk 9 and the rotating shaft 10, and a hot water generator (not shown) supplies hot water of about 70 to 80°C to evaporate the cleaning solvent inside the rotating disk 9. It is something that makes you

Effects of the Invention As described above, the present invention specifically arranges cleaning solvent evaporation storage parts in multiple stages, and evaporates the cleaning solvent while sequentially flowing down from the top to the bottom, and the concentrated liquid is stored in the lowest storage part. Therefore, foreign matter such as oil is less likely to accumulate in each evaporation storage section, and it is not possible to use conventional equipment that directly heats and evaporates the concentrated liquid, which has an increased concentration of foreign matter such as oil, by supplying the hot bath liquid as it is. The solvent vapor evaporated on the heater surface ruptures on the oil surface and scatters with the oil etc. when the solvent evaporates, which is the so-called droplet entrainment. can maintain constant quality for a long time,
This has the excellent effect of significantly extending the time interval for solvent renewal and reducing solvent bone.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a conventional solvent cleaning device, FIG. 2 is an enlarged longitudinal sectional front view of a first embodiment of the present invention, and FIG. 3 is a second embodiment of the same.
FIG. 3 is an enlarged longitudinal sectional front view of the embodiment. DESCRIPTION OF SYMBOLS 1...Cleaning device main body, 2...Distiller, 8...Distiller main body, 8a...Introduction piping, 8b...Discharge piping, 9
...Rotating disk, 9a...Electric heater, 10...
・Rotating shaft, 13... Distilled agent inlet, 1
3a...Tray, 14...Solvent vapor outlet, 15.
...Cooling pipe, 17... Concentrator tank, 18... Hot water circuit. Figure 61 Figure 2

Claims (1)

[Scope of Claims] 1. Inside the distiller body for distilling cleaning solvent, cleaning solvent evaporation storage sections each having a heating source are arranged in multiple stages, and a cleaning agent introduction pipe is provided above the evaporation storage section at the top stage. 1. A distiller for a solvent cleaning device, characterized in that a distillation vessel for a solvent cleaning device is opened, and a concentrated liquid storage portion is provided below a lowermost evaporation storage portion. 2. The distiller for a solvent cleaning device according to claim 1, wherein the evaporation storage section is rotatable. 3. The distiller for a solvent cleaning device according to claim 1 or 2, wherein an electric heater is used as a heating source for the evaporation storage section. 4. The distiller for a solvent cleaning device according to claim 1 or 2, wherein hot water is used as a heating source for the evaporation storage section.