JPH0824808A - Part and member cleaning method - Google Patents

Abstract

PURPOSE:To efficiently clean even fine portions of parts and members even if the parts and members have complicated shapes by jetting spiral jet current of a cleaning liquid by a spiral nozzle installed in a cleaning liquid tank and swinging the cleaning liquid regarding a cleaning method to clean parts and members by immersing the parts and members in a cleaning liquid tank. CONSTITUTION:At the time of cleaning, a spiral nozzle such as a Coanda spiral nozzle 12 etc., attached to a supporting shaft part 11 is immersed in a cleaning liquid tank 10 and a part of a cleaning liquid is pressurized and jetted from a slit 1. That is, a pressurized liquid 3 of a cleaning liquid supplied from the circular Coanda slit 1 through a distribution chamber 2 is a a jetted along a tilting face 4 or a curved face, a spiral current is jetted from jetting outlet 5, and a liquid 7 of the cleaning liquid is thus introduced from a suction region at a strongly negative pressure produced in an introducing inlet 6 by jetting of the pressured liquid 3 and jetted to clean articles. A plurality of nozzles whose nozzle outlet parts 5 are set in different directions are used for the nozzle 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cleaning parts / members. More specifically, the present invention is
The present invention relates to an improved cleaning method for parts and members of machines, devices, automobiles, etc., which is capable of efficiently removing dirt and the like even if the product has a complicated shape.

[0002]

2. Description of the Related Art Conventionally, parts and members of machines, devices, automobiles, etc. have been cleaned with chlorine-based solvents such as trichloroethane and freon in order to remove and clean oil and dirt on the surface. However, in response to the implementation of CFC regulations on a global scale and the recent trend of regulation of ethane-based solvents such as trichloroethane, a cleaning method using a so-called "CFC-free / ethane-free" solvent Is being investigated, and realization of a more effective and improved cleaning method has become an urgent issue.

Under such circumstances, water-based or non-aqueous alcohol-based cleaning agents have been developed as new cleaning agents. However, with the development and use of these new cleaning agents, "defluorocarbon / ethane removal"
However, the cleaning effect is not always sufficient, and especially in the case of a product having a complicated shape, the cleaning is inadequate and there is a problem that the required quality cannot be obtained.

Usually, in a large-scale cleaning process of various parts / members, a net basket containing the parts / members is immersed in a cleaning liquid tank for cleaning, and this process is arranged in a multistage processing tank. It is also implemented as a process. However, even in multi-stage cleaning using multiple treatment tanks, a sufficient cleaning effect cannot be obtained with the "defluorocarbon-free-ethane" type cleaning agent, and rather, recontamination due to contamination during cleaning processing cannot be avoided. There was a problem.

In order to solve such a problem, the cleaning liquid is oscillated by blowing air into the cleaning liquid tank for bubbling, oscillating the net basket, or discharging the cleaning liquid as a nozzle jet. , Cleaning liquid and parts
Various efforts have been made to improve the efficiency of contact with a member and to improve the diffusion of contaminants into the cleaning liquid. However, there is a problem that blowing air reduces the cleaning performance due to the performance of the "defluorocarbon-free-ethane" type cleaning agent, and the shaking of the mesh basket is not enough to clean the cleaning solution. The fact is that even with the nozzle jet flow, the cleaning liquid does not sufficiently diffuse and oscillate.

[0006] Therefore, an object of the present invention is to solve the problems of the prior art as described above and to provide an improved cleaning method for parts and members which is excellent in cleaning effect.

[0007]

In order to solve the above problems, the present invention is a method of immersing parts / members in a cleaning liquid tank for cleaning, in which a spiral jet of cleaning liquid is provided by a spiral nozzle arranged in the cleaning liquid tank. Is discharged,
Provided is a method for cleaning a component / member, which comprises rocking a cleaning liquid.

[0008]

As described above, the present invention is characterized in that the spiral jet of the cleaning liquid is ejected from the nozzle.
The spiral jet flow is ejected from the nozzle outlet as a so-called swirl flow, so that the reaching distance becomes larger than that of the nozzle jet flow due to the conventional turbulent flow, and the fluctuation of the cleaning liquid in the tank becomes larger. Further, even when an object having a complicated shape is targeted, the fluctuation of the cleaning liquid can be spread to the details thereof.

Such a feature is an essential difference between the conventional turbulent jet flow and the spiral jet flow as the swirl flow of the present invention. As a spiral nozzle, the Coanda spiral developed by the inventor of the present invention is used. In the case of nozzles,
The features of the present invention become more prominent. The spiral jet generated by the Coanda spiral nozzle is characterized by the so-called Coanda effect and the generation of a unique spiral flow, and shows a fluid motion phenomenon that is essentially different from the turbulent flow widely used in the past. Is. The Coanda spiral flow exhibits a so-called steeper velocity distribution in which the velocity difference between the axial flow of the fluid and its surroundings and the density difference are large, the pipe axis flow is fast, and the outer flow is slow. Further, the degree of turbulence is 0.09, which is half or less when the normal turbulent flow is 0.2, which is essentially different from the turbulent flow. Then, a unique spiral flow is formed by combining the axial vector and the radial vector.

The formation of the nozzle jet by the Coanda spiral flow can be basically shown schematically in FIG. That is, for example, as shown in FIG. 1, the pressurized liquid (3) made of the cleaning liquid supplied from the annular Coanda slit (1) through the distribution chamber (2) is supplied to the inclined surface (4) or A liquid (7) consisting of a cleaning liquid from a strong negative pressure suction region of an inlet (6) which is ejected along a curved surface and a spiral flow is ejected from an ejection port (5) and simultaneously generated by ejection of a pressurized liquid (3). Is a basic aspect.

The pressurized liquid (3) can be adjusted to an appropriate pressure depending on its type and the mode of spiral flow.
For example, it can be 1 to 10 kg / cm ² , or more. Moreover, the inclination angle (θ) of the inclined surface (4) or the curved surface can be up to about 5 to 70 °. By using such a Coanda spiral nozzle, the cleaning liquid in the cleaning liquid tank can be greatly shaken, and even in the cleaning of odd-shaped and complicated-shaped products, the shaking can be spread to the details thereof. .

For cleaning, as shown in the plan view of FIG. 2, for example, the supporting shaft portion (1) is placed in the cleaning liquid tank (10).
A spiral nozzle such as the Coanda spiral nozzle (12) having the above-mentioned structure attached to 1) is immersed, and a part of the cleaning liquid is pressurized and ejected from the slit (1). As a result, the Coanda spiral jet is discharged from the nozzle outlet (5). Then, for example, at this time, the support shaft portion (11) is provided with a plurality of nozzles having different nozzle outlet (5) directions around and / or in the vertical direction. The support shaft portion (11) itself may be rotatable and movable. Due to the arrangement of the plurality of nozzles, the fluctuation given to the cleaning liquid becomes very large.

Of course, in the present invention, in addition to the Coanda spiral nozzle, a nozzle that can forcibly generate a spiral jet may be used. The wash stream may be circulated and used. Further, the circulation may be performed in a multistage process.

[0014]

EXAMPLE The nozzle means illustrated in FIG. 1 is duplicated as shown in FIG.
Several gears were arranged to wash the gears after cutting. Annular core
The width of the solder slit (1) is 0.1 mm, and the width of the inclined surface (4) is
The inclination angle (θ) is 30 ° and the inner diameter of the discharge port (5) is 20 mm.
And Higher quality Alcohol than annular Coanda slit (1)
5 kg / cm of water-based cleaning solution ²It is ejected with the pressure of
The cleaning liquid was sucked through the inlet (6). The nozzle exit
A spiral jet was ejected. 5 kg / cm²Pressure of
When the cleaning liquid is jetted from the turbulent flow nozzle as in the past
Compared with, the cleaning time is about 1/2, and even the details of the gear are
Cleaning is now possible.

It has been confirmed that an excellent cleaning effect is realized by the jet of the cleaning liquid by the Coanda spiral nozzle.

[0016]

As described above in detail, the cleaning method of the present invention enables efficient cleaning of even the details of a complicated product.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a Coanda spiral nozzle.

FIG. 2 is a plan view illustrating the arrangement of nozzles.

[Explanation of symbols]

 1 Annular Coanda Slit 2 Distribution Chamber 3 Pressurized Liquid 4 Slope 5 Discharge Surface 6 Inlet 7 Liquid 10 Cleaning Liquid Tank 11 Support Shaft 12 Coanda Spiral Nozzle

Claims (6)

[Claims] 1. A method of immersing a part / member in a cleaning liquid tank for cleaning, wherein a spiral nozzle of the cleaning liquid is discharged by a spiral nozzle arranged in the cleaning liquid tank to swing the cleaning liquid. Cleaning method. 2. The cleaning method according to claim 1, wherein the spiral nozzle is a Coanda spiral nozzle. 3. The cleaning nozzle as claimed in claim 1, wherein a plurality of spiral nozzles having different discharge directions are provided on a supporting shaft portion hung in the cleaning liquid tank, and a spiral jet is discharged from each nozzle into the cleaning liquid tank. Cleaning method. 4. The cleaning method according to claim 3, wherein a plurality of spiral nozzles are arranged around the support shaft portion. 5. The cleaning method according to claim 3, wherein a plurality of spiral nozzles are arranged in a direction perpendicular to the support shaft portion. 6. The cleaning method according to claim 3, 4 or 5, wherein the support shaft portion is rotatable and / or movable.