RU2696659C1 - Vacuum drying chamber with infrared heating - Google Patents

Abstract

FIELD: aviation.

SUBSTANCE: invention relates to aircraft-rocket equipment, namely, to devices for drying tank compartments with fuel intake system (removal of uninflammable water residue from its inner cavities). Tank compartments of aircraft-rocket equipment can be made of aluminum alloy, therefore temperature of drying for such tanks is limited by maximum temperature (no more than 110 °C). Disclosed vacuum drying chamber with infrared heating for removal of unmovable residue of water from inner cavities of tank compartment with fuel sampling system comprises vacuum chamber with infrared heaters, thermocouples fixed with the help of detachable hold-down clamps, which can move to select the zone with unmovable water residue in the tank compartment, and control temperature controllers of temperature maintenance on these zones of the tank. Drying chamber also contains a temperature and humidity meter for control inside the vacuum chamber.

EFFECT: reduced duration of drying, as well as reduction of power consumption and labor intensity of this process.

4 cl, 2 dwg

Description

The invention relates to aircraft-rocket technology, and in particular to devices for drying tank compartments with a fuel intake system (removal of an indelible remaining water from its internal cavities).

In the manufacture of tank compartments with a fuel intake system, residual contaminants (chips, pile, etc.) remain inside the tank compartment. After washing the internal cavities of the tank compartment from contamination, the purity of the water drained from the tank should be no worse than grade 8 in accordance with GOST 17216-2001. As a result of flushing the tank, some designs of the tank compartment leave an indelible remaining water in the internal cavities of the tank compartment. Non-leaking water residue can be located in various zones along the length of the tank compartment, depending on the design and calculated in liters.

Tank compartments of aircraft-rocket technology can be made of aluminum alloy, therefore, the drying temperature for such tanks is limited by the limiting temperature (not more than 110 ° C).

Water can be removed using one of the following drying methods: convective, temperature, one-way evacuation, general evacuation, vacuum-temperature.

When choosing a drying method, it is necessary to take into account the characteristics of the product and the requirements for it, as well as the permissible modes of heating the material of the product.

Vacuum drying chambers are known to provide a certain vacuum and temperature of the product for drying by the vacuum-temperature method. When drying by this method, first turn on the heating device, and after reaching the required drying temperature, turn on the vacuum pump and provide the necessary vacuum. The closest analogues: according to the textbook "Scientific foundations of vacuum technology", Deshman S. M., 2004. p. 715;

In the presence of a large amount of water, the above drying plants have the following disadvantages:

- A lengthy process of removing non-leaking water residue from the tank compartment;

- high energy consumption for removing water from the tank compartment.

The technical problem to which the invention is directed is:

- reducing the drying time to remove non-leaking water residue from the internal cavities of the tank compartment;

- reducing the energy intensity and complexity of the drying process.

A vacuum drying chamber with infrared heating to remove non-leaking water residue from the internal cavities of the tank compartment with a fuel intake system contains a vacuum chamber with infrared heaters, thermocouples fixed with removable pressure clamps that can be moved to select a zone with indelible remaining water in the tank compartment, and control temperature controllers to maintain temperature in these zones of the tank, as well as a temperature and humidity meter for monitoring inside the vacuum chamber.

To achieve the named technical result, infrared heaters are located directly under the bottom of the tank compartment.

Infrared heaters are divided into controllable zones with a tank compartment where there may be non-leaking residual water.

Management and control of heating is carried out autonomously in the zones in the tank compartment in which water is assumed.

The temperature setting for drying in each zone is set via a thermocouple connected to a digital controller, on which the maximum heating temperature is set.

Thermocouples are mounted on removable clamping clamps and are attached with them to the bottom of the tank compartment in the zones where the water is.

From casting an increase in the set temperature on the bottom of the tank compartment, the installation height of the tank compartment relative to the heaters is regulated by racks with lodgements under the tank compartment.

When heated with decreasing pressure, the bottom of the tank with a thermocouple is cooled where the water is located, i.e. a decrease in temperature indicates the presence of water in the zones above the thermocouples. Upon completion of the evaporation of water in one of the zones, the temperature rises sharply to a predetermined one and the heaters in this zone turn off and heating occurs in those zones where an incomplete residue of water remains.

This technical solution significantly reduces the duration, energy consumption and the complexity of the drying process compared to other devices.

A vacuum drying apparatus with infrared heating for drying the tank compartments is shown in FIG. 1 and 2.

The dryer operates with heating-vacuum cycles as follows:

The pressurized tank compartment 1, with thermocouples 2 installed in the heating zones on removable clamping clamps (4 zones shown), is placed on a chamber trolley with height-adjustable tool holders 3 and rolled along rails 4 into the drying chamber 5. Thermocouples on removable clamps should be under the bottom of the tank compartment. The set temperature limit is set on the control cabinet 6 using digital controllers on the panel 7 according to the heating zones of the tank compartment.

They include all infrared heaters with a reflective screen 8. For an aluminum tank compartment, the temperature is set no more than 110 ° C.

After thermostating, the control according to the controllers 7 carries out a heating-evacuation cycle of the tank compartment 1. The vacuum pump 9 is turned on and the pressure in the chamber slowly decreases to the minimum possible. In the process of lowering the pressure, water boils in non-leaking residues with steam being removed from the chamber by the vacuum pump 9. The pressure in the chamber is monitored by a vacuum gauge 10. If the temperature in the zones of the thermocouple 3 installation decreases during heating, this means the presence of water in this heating zone. After reaching the limit of low pressure, the vacuum pump turns off, the pressure in the chamber is brought to normal and the heating-vacuum cycle is repeated.

Drying is carried out until there is a decrease in temperature with a decrease in pressure and a predetermined limit temperature is established in all zones of the tank compartment 1 according to the readings of the controllers 7.

The final control of dryness is carried out by measuring the sensor 11 of the temperature and humidity meter 12. After the dryness control is completed, evacuation is performed to the lowest possible reduced pressure in the chamber and to equalize the pressure to atmospheric, dry nitrogen is started with a dew point of no higher than minus 50 ° С.

Claims (4)

1. Vacuum drying chamber with infrared heating to remove non-leaking water residue from the internal cavities of the tank compartment with a fuel intake system, comprising a vacuum chamber with infrared heaters, thermocouples fixed with removable pressure clamps that can be moved to select a zone with non-leaking water residue in tank compartment, and control temperature controllers to maintain temperature in these zones of the tank, as well as a temperature and humidity meter for monitoring inside the vacuum chamber. 2. The vacuum drying chamber according to claim 1, characterized in that the infrared heaters are located under the tank compartment with thermocouples and are divided into zones with separate heating control, using temperature controllers in each zone along the length of the tank compartment in which there is an indelible residue with water . 3. The vacuum drying chamber according to claim 1, characterized in that in order to save energy, after removing the non-leaking water residue from one zone, the infrared heaters of this zone are turned off and the water is removed from the remaining zones. 4. The vacuum drying chamber according to claim 1, characterized in that from throwing a predetermined temperature from infrared heaters along the bottom of the tank compartment, in addition to the control temperature controllers, the distance between the tank compartment and infrared heaters is additionally adjusted using racks with lodges under the tank compartment.

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