JPH04145988A - Method and apparatus for washing body to be washed with combustible solvent - Google Patents

Abstract

PURPOSE:To prevent the danger of ignition attending on washing a body to be washed and to efficiently carry out safe washing by physically stirring a combustible solvent and a completely fluorinated liq. and bringing the resulting liq. mixture into contact with the body by jetting. CONSTITUTION:A combustible solvent and a completely fluorinated liq. are physically stirred with a stirring mechanism 1 to prepare a liq. mixture 3 and this mixture 3 is jetted and fed to the body 5 with a feeding mechanism 6 to wash the body 5 in a washing vessel 13. While the combustible solvent having superior washing power and not causing environmental disruption is used, the danger of ignition is prevented at the time of washing the body 5 and safe washing can be efficiently carried out. Since the completely fluorinated liq. is inert and different from the combustible solvent in specific gravity, it is easily separated and can always be recovered to ensure high economical efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for cleaning objects to be cleaned using a flammable solvent, and is suitable for cleaning objects to be cleaned such as mechanical parts and printed circuit boards. It is intended to be carried out safely using flammable solvents.

Conventional technology Conventionally, fluorocarbon solvents have generally been used to clean objects to be cleaned, such as mechanical parts and printed circuit boards, because they are nonflammable, pose no risk of catching fire, and have excellent cleaning power. It was getting worse. However, its use has become regulated because it is associated with destruction of the global environment.

Solvents that can replace these fluorocarbon-based solvents include terpene solvents whose main ingredient is ll11 extracted from oranges, compositions consisting of a mixture of terpene solvents and terpene emulsifying surfactants, alcohol, and silicone-based solvents due to their excellent detergency. Solvents such as solvents and hydrocarbon solvents are considered.

However, since these are all flammable solvents, it is necessary to ensure safety against ignition. As a method for cleaning the object to be cleaned while ensuring safety against ignition, it may be possible to perform the cleaning operation in an atmosphere of nonflammable gas such as nitrogen, argon, helium, or the like. However, since these gases have a lower specific gravity than air, they tend to leak outside or introduce outside air when the items to be cleaned are taken in and out, and they cannot be cooled and condensed and cannot be recovered, making them economically inefficient. It has bad drawbacks.

Problems to be Solved by the Invention The present invention attempts to solve two problems. The aim is to prevent the risk of ignition associated with cleaning work, and to carry out safe and efficient cleaning.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention physically mixes and stirs a flammable solvent and a fully fluorinated liquid to form a mixed solution, and applies this mixed solution to the object to be cleaned. This is characterized by the fact that it is carried out through injection contact.

Further, the apparatus embodying the above invention includes a stirring mechanism that physically stirs a flammable solvent and a fully fluorinated liquid to form a mixed liquid, and an apparatus that injects the mixed liquid made by this stirring mechanism to the object to be cleaned. The washing tank is comprised of a supply mechanism for cleaning objects to be cleaned using a mixed liquid supplied by the supply mechanism.

Function Since the present invention is constructed as described above, in order to clean the object to be cleaned, first, a terpene solvent, a mixture of a terpene solvent and a terpene emulsifying surfactant, an alcohol solvent, or a hydrocarbon solvent is used. , a mixture of a flammable solvent suitable for the purpose of cleaning the object to be cleaned, such as a silicone solvent, and a fully fluorinated liquid, which is an inert liquid, is physically stirred using a stirring mechanism without using chemical methods. shall be.

The liquid mixture created by this stirring mechanism is injected and supplied to the object to be cleaned by a supply mechanism such as a pump.

This injection supply is performed by an injection nozzle in the cleaning tank, but the flammable solvent with excellent cleaning ability is applied to the object to be cleaned.
Since it is sprayed together with a fully fluorinated liquid, dirt adhering to the object to be cleaned is reliably removed. In addition, this flammable solvent is extremely flammable under normal conditions, but since it is sprayed as a mixture with an inert fully fluorinated liquid from the spray nozzle onto the object to be cleaned, there is a risk of ignition. will be extremely small.

Additionally, since flammable solvents and fully fluorinated liquids have different specific gravity and fully fluorinated liquids are inert, flammable solvents and fully fluorinated liquids can be easily separated and always recovered. Since it can also be condensed by cooling, it is more economical than cleaning in an atmosphere of gases such as nitrogen, argon, helium, etc., which cannot be cooled and condensed and cannot be recovered.

EXAMPLE Below, the first example of the present invention will be explained with reference to FIG.
(1) is a stirring mechanism in which flammable solvents such as a terpene solvent, a mixture of a terpene solvent and a terpene emulsifying surfactant, an alcohol solvent, a hydrocarbon solvent, a silicone solvent, etc. , and a fully fluorinated liquid, which is an inert liquid, at the same time.

Then, the flammable solvent and the fully fluorinated liquid are physically stirred to form a mixed liquid (3). In order to compose this mixed solution (3), the stirring mechanism (1) is used.
Regarding 1), the method is not particularly limited as long as the flammable solvent and the fully fluorinated liquid can be physically mixed. For example, as shown in the drawing, stirring and mixing may be performed using a mixer (9) rotated by an explosion-proof electric motor (4), ultrasonic vibration may be used, jet flow from a pump may be used, Further, a plurality or all of these methods may be used simultaneously, or other different methods may be used.

In addition, a supply mechanism (6) that injects the mixture (3) of a flammable solvent and a fully fluorinated liquid prepared in this way onto the object to be cleaned (5) is connected to a supply pump (7). Stirring tank (
2) is connected to the inlet pipe (8), and an outlet pipe (10) is connected to the outlet side. This outlet pipe (10) is
The supply pump (7) is connected via a filter (11) and a control valve (12) to an injection nozzle (14) in a cleaning tank (13) that cleans the object (5) to be cleaned.

In addition, a plurality of injection nozzles (14) are placed in the cleaning tank (13) for cleaning the object (5) to be cleaned.
5) is provided with a washing stand (15) on which it is placed.

This washing table (15) is equipped with a rotating shaft (17) that is rotated by a prime mover (16) installed outside the washing tank (13).
) is connected via a power transmission means (19) such as a gear or chain, and is rotatable in the cleaning tank (13), so that the mixed liquid (3) is injected from the injection nozzle (14). ) can be evenly sprayed onto the object to be cleaned (5). In addition, a cooling pipe (18) for steam condensation is wound around the inner periphery of the cleaning tank (13), and the upper end opening (2
0) is covered with a lid (21).

The lower end of the cleaning tank (13) is shaped like a cone, and a reflux port (23) that communicates with the upper part of the stirring tank (2) via a valve (22) is provided at the bottom of the cleaning tank (13). The mixed solution (3) used for washing is refluxed to the stirring tank (2) and used for circulation.

In the structure as described above, in order to perform the cleaning work on the object to be cleaned (5), the cleaning table (15) of the cleaning tank (13) is used.
The object to be cleaned (5) is placed on. Next, the flammable solvent and fully fluorinated liquid in the stirring tank (2) are mixed without using chemical methods.
The mixture is physically stirred by the stirring mechanism (1) to form a mixed liquid (3).

This mixed liquid (3) made by the stirring mechanism (1) is
A supply mechanism (6) such as a pump supplies the object to be cleaned (5) by injection at high pressure. This injection supply is carried out in the cleaning tank (13)
The washing is carried out by the injection nozzle (14) inside the washing table (1
5) is connected to the prime mover (16) and is rotatable in the cleaning tank (13), so that the mixed liquid (3) sprayed from the spray nozzle (14) is distributed evenly (to the object to be cleaned). 5).Furthermore, since a flammable solvent with excellent cleaning ability is injected together with a fully fluorinated liquid onto the object to be cleaned (5), it will not adhere to the object to be cleaned (5). Any filth that is present will be definitely removed.

In addition, this flammable solvent is extremely flammable under normal conditions, but since it is supplied as a mixed liquid (3) with an inert fully fluorinated liquid, the risk of ignition is extremely low. becomes.

In addition, the fully fluorinated liquid and the flammable solvent that make up the mixed liquid (3) have different specific gravity, and the fully fluorinated liquid is inert, so the flammable solvent and the fully fluorinated liquid can easily be separated. It can be separated and always recovered, making it more economical than cleaning in an atmosphere of gases such as nitrogen, argon, helium, etc., which cannot be cooled and condensed and cannot be recovered.

Effects of the Invention Since the present invention is constructed as described above, it uses a flammable solvent that has excellent cleaning power and does not cause destruction of the global environment, while eliminating the risk of ignition that accompanies cleaning work of objects to be cleaned. This enables safe and efficient cleaning.

Furthermore, since the fully fluorinated liquid and the flammable solvent have different specific gravity and the fully fluorinated liquid is inert, they can be easily separated and always recovered, resulting in good economic efficiency.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. (1)...Stirring mechanism (3)...Mixed liquid (5
)・・Object to be cleaned (6)・ Supply mechanism (13)・・Cleaning tank

Claims (2)

[Claims] (1) A method using a flammable solvent characterized in that a flammable solvent and a fully fluorinated liquid are physically mixed and stirred to form a mixed solution, and this mixed solution is sprayed into contact with the object to be cleaned. How to clean the object to be cleaned. (2) A stirring mechanism that physically stirs a flammable solvent and a fully fluorinated liquid to form a mixed liquid, a supply mechanism that injects the mixed liquid made by this stirring mechanism onto the object to be cleaned, and this supply. 1. An apparatus for cleaning objects using a flammable solvent, comprising a cleaning tank for cleaning objects to be cleaned with a mixed liquid supplied by a mechanism.