RU2235924C2 - Method of filling closed systems with fluid - Google Patents

Abstract

FIELD: hydraulics.

SUBSTANCE: method includes evacuating the chamber filled with fluid and provided with closed systems, the open ends of which point downward, and filling the systems under the atmospheric pressure. When the chambers are evacuated, the open ends of the closed systems are arranged above the fluid. Before the pressurization of the chamber, the open ends are submerged into the fluid at a depth where the penetration of air into the closed systems is excluded.

EFFECT: enhanced quality of filling.

1 dwg

Description

The invention relates to mechanical engineering and can be used to fill the internal cavities of devices, in particular heat-sensitive systems of temperature sensors, temperature relays with liquid filler with preliminary air removal.

Known methods and devices for filling according to the patents of the Russian Federation No. 1585564 (15.08.90, bull. No. 30), No. 1751452 (07.30.92, bull. No. 28), No. 1767239 (07.10.92, bull. No. 37), No. 2103567 ( 01/27/98, bull. No. 3), No. 21595964 (08.27.99, bull. No. 24), No. 2064097 (07.20.96, bull. No. 20) by preliminary pumping air from closed systems using a vacuum pump and filling them with liquid filler under atmospheric pressure. Common disadvantages of these inventions are either the complexity of the equipment and low productivity, or the dependence of the filling results on the amount of air remaining in the filled closed system due to the formation of a gas cushion, the pressure in which depends on the specific gravity of the liquid and the depth of immersion.

A known method of filling closed systems with liquid according to the patent of the Russian Federation No. 2186264 (07/27/2002, bull. No. 21), which consists in the fact that the filling of closed systems with liquid is carried out by evacuating the chamber with closed systems placed in it, immersed open ends down in the liquid, and subsequent filling under atmospheric pressure, and simultaneously with the beginning of the evacuation of the chamber, the open ends of the closed systems are lifted to achieve the minimum immersion depth, and with the beginning of the pressure supply to the chamber, their immersion. The method has a fairly high performance, but low quality filling. It is at the moment pressure is applied to the chamber, when the open ends of the closed systems are immersed to a minimum depth in the liquid, through a minimum column of liquid, a small amount of air still enters the closed system, since any liquid is quickly saturated with air and primarily close to the surface layer.

An object of the invention is to improve the quality of filling.

The technical result is achieved by the fact that the filling of closed systems with liquid is carried out by evacuating the chamber with the open ends located in it and the closed system with liquid and then filling it with atmospheric pressure, and when the chamber is evacuated, the open ends of the closed systems are located above the liquid, and before starting to apply pressure they are immersed into the chamber to a depth of liquid, which prevents air from entering closed systems at the end of the filling process.

The proposed method is simple to implement. The drawing schematically shows one of the devices implementing the method of filling closed systems with liquid.

Closed systems 1, which must be filled, are inserted into the openings of the pallet 2 with their open ends down. The pallet 2 is installed inside the chamber 3 with liquid filler 4 on the mechanism 5 (the mechanism can be structurally either pneumatic, or hydraulic, or mechanical), lifting-lowering the pallet 2. In the chamber 3 there are stops 6 that limit the rise of the pallet 2 upwards.

In the initial state, the open ends of the closed systems 1 are located above the liquid filler 4, which improves their separate evacuation. Before the start of pumping air from the chamber 3 all specified pressure (P _to chamber 3 and R _corolla in the internal cavity closed systems 1) in the figure is equal to the atmospheric pressure P _atm.

Filling is as follows.

Begin pumping air from the chamber 3, the pressure P _to and P _VN fall. Upon reaching the required vacuum, the mechanism 5 lowers the tray 2 downward, immersing the open ends of the closed systems 1 in the liquid to a depth, which should be determined from the calculation of the open ends in the liquid at the end of the filling process, when P _k = P _int = P _atm , which excludes air entering closed systems. Moreover, even if at the end of the filling process the immersion depth, which decreases as filling of closed systems, is minimal, the ingress of air into closed systems is above the norm, since all pressures will be equal to atmospheric and the liquid is in a state of its natural saturation with air at atmospheric pressure . Next, pressure is injected into the chamber 3. The pressure P _k begins to aspire to atmospheric, the liquid filler 4 gradually fills the internal cavity of the closed systems 1 until all the pressures are level (P _k = P _int = P _atm ).

The proposed method of filling closed systems with liquid has not only high performance, but also high quality filling.

Claims (1)

A method of filling closed systems with liquid, including evacuating the chamber with the liquid placed in it and the closed systems open ends down, followed by filling under atmospheric pressure, characterized in that when the chamber is evacuated, the open ends of the closed systems are located above the liquid, and before starting to pressurize the chamber their immersion in liquid to a depth that prevents air from entering closed systems at the end of the filling process.