RU2802910C1 - Method for cleaning objects with a jet of liquid - Google Patents

Abstract

FIELD: electronics.

SUBSTANCE: cleaning of products from contamination, in particular cleaning of printed circuit boards with electronic products placed on them. The method for cleaning printed circuit boards with electronic products placed on them includes placing printed circuit boards in a container with a cleaning liquid, which is water with a surfactant admixture. The method uses a container, the lower part of which is connected by the first pipe to the inlet of the pump, the outlet of which is connected by the second pipe to the nozzle, which is located above the liquid level, while a jet of cleaning liquid is supplied to the nozzle from the lower part of the container, which, when the air space passes above the liquid level, entrains air with the formation of foam, and then the container is filled with foam, which is circulated by a pump.

EFFECT: increase in the cleaning efficiency and a decrease in the consumption of the cleaning agent.

3 cl, 1 dwg

Description

The invention relates to jet cleaning of products from contaminants, in particular to jet washing of parts, and is applicable when processing printed circuit boards with electronic products placed on them.

There is a known “METHOD FOR JET WASHING PARTS ON SUSPENSIONS” RU 2166564 [1], which includes supplying beams of parallel jets of washing liquid from its source to the surface of parts, as well as capturing the washing liquid during the process of washing parts for reuse after appropriate cleaning.

The disadvantage of this known method is the low cleaning efficiency of a relatively laminar flow of a jet of washing liquid.

The closest to the claimed technical solution is the “Method for extracting liquid dissolved in a washing bath” EP 0608700 [2], which includes a container with a cleaning liquid, a pump, the inlet of which is hydraulically connected to the bottom of the container, and a nozzle connected to the pump outlet.

The known method allows you to clean products in a non-laminar flow, using liquid spraying through a nozzle.

The disadvantage is low cleaning efficiency and increased consumption of cleaning agent.

The technical result is increased cleaning efficiency and reduced consumption of cleaning agent.

The technical result is achieved in that the method of cleaning objects with a jet of liquid, including a container with a cleaning liquid, a liquid in which the object to be cleaned is placed, a pump, the inlet of which is connected by a first pipe to the bottom of the container, a nozzle connected by a second pipe to the output of the pump, is characterized by that gas is introduced into the liquid to form a gas-liquid foam.

Air can be used as a gas, and water with a surfactant admixture as a cleaning liquid, which will increase the cleaning efficiency. Soap of plant origin can be used as a surfactant, which will further increase the cleaning efficiency.

A device for implementing the method according to Clause 1, including a container with a cleaning liquid in which the object to be cleaned is placed, a pump, the inlet of which is connected by a first pipe to the bottom of the container, a nozzle connected by a second pipe to the output of the pump, characterized in that the nozzle is located above the level cleaning fluid, the nozzle is aimed at the upper level of liquid and/or foam (so that the stream of liquid from the pump captures air).

Carrying out the invention

In fig. schematically shows a device for implementing the method, where:

1 - capacity;

2 - pump;

3 - nozzle;

4 - upper liquid level;

5 - item to be cleaned;

6 - first pipe;

7 - second pipe.

The method is carried out as follows

The object (product) 5 to be cleaned is placed in container 1. Pump 2 takes liquid from the bottom of the container through the first pipe 6 and delivers it through the second pipe 7 to the nozzle 3, which is located above the upper level of the liquid 4. The jet from the nozzle, passing the air space above the upper level of the liquid entrains air, forming foam. During further operation, the entire container is filled with foam, the foam enters the pump, nozzle and then circulates in the device.

Technical result

An increase in cleaning efficiency is achieved by the non-laminar movement of liquid with gas bubbles at the micro level: when a bubble passes over a contaminated surface, in addition to the laminar component, there is a lateral component that promotes better detachment of dirt particles, which increases the cleaning efficiency. Reducing the consumption of the cleaning agent is achieved by the fact that the concentration of surfactants in the foam bubbles is higher than in the rest of the liquid. This allows cleaning with less surfactant, which reduces surfactant consumption.

Industrial applicability

The proposed method of cleaning objects with a jet of liquid has been tested for cleaning computer boards and allows you to clean the space between the board and elements mounted on the surface (processors, bridges, planar non-removable memory, etc.), after which performance indicators and processor speeds increase due to a decrease in the capacity of the cleaned conductors and less signal loss when passing through cleaned conductors.

Claims (3)

1. A method for cleaning printed circuit boards with electronic products placed on them, including placing the printed circuit boards in a container with a cleaning liquid, which is water mixed with a surfactant, using a container, the lower part of which is connected by the first pipe to the inlet of a pump, the output of which the second pipe is connected to a nozzle, which is located above the liquid level, while a jet of cleaning liquid is supplied to the nozzle from the bottom of the container, which, when passing the air space above the liquid level, entrains air to form foam, and then the container is filled with foam, which is circulated by a pump. 2. The method according to claim 1, characterized in that soap of plant origin is used as a surfactant. 3. The use of a device for cleaning objects, containing a container for cleaning liquid, configured to place the item to be cleaned in it, a pump, the inlet of which is connected by a first pipe to the bottom of the container, and the outlet of which is connected by a second pipe to a nozzle located above the level of the cleaning liquid and aimed at the liquid level, as a device for cleaning printed circuit boards with electronic products placed on them using the method according to claim 1.