RU33927U1 - Helicopter cab heating and ventilation system air heater - Google Patents

Abstract

An air heater for the helicopter’s cabin heating and ventilation system, comprising a hood body, a fan with an air intake for sucking in external air and supplying it to the heater or to the ventilation of the cabins, an air intake damper, a heater, a heated air flow distributor between the mains to the crew cabin and to the cargo compartment, fuel box with heater fuel equipment, fire fighting system, control and control equipment, and air, fire and fuel equipment with a fuel pump landing gear, characterized in that the air heater of the helicopter cabin heating and ventilation system is made of two parts, one of which is a self-contained removable module containing a hood housing, inside of which there is a fan with an air intake for sucking in the outside air and supplying it to the heater or ventilation cabins, an air intake damper with an electromechanism, a heater, a heated air flow distributor between the highways to the crew cabin and to the cargo compartment, fire fighting system and air main, fire and fuel lines, and the second part is a compartment with units, permanently mounted on the fuselage of the helicopter in the continuation of the right fuel tank, and inside the compartment under the fairing there is a fuel box with fuel heater equipment, control equipment, air, fire and fuel the fuel pump of the line, while both parts of the heater on the air, fire and fuel lines are hermetically connected to each other by the corresponding mag

Description

The heater of the heating and air conditioning system The utility model relates to aeronautical engineering and can be used for heating and ventilation of helicopter cabins. The MI-17 helicopter is equipped with a heating and ventilation system that provides heated and atmospheric air to the crew cabin and cargo compartment to maintain normal temperature conditions in them. The main unit of the system is the kerosene heater KO-50. The heater fan supplies heated (or without heating in ventilation mode) air to the outlet distributor, and then through the air ducts to the crew cabin and to the cargo compartment. The distribution system is designed for intake and distribution of air and includes an air intake, an outlet distributor, air ducts, heating ducts and pipes. The air intake is located on the outside of the starboard side of the fuselage in front of the heater hood. The amount of air taken from the atmosphere is determined by the damper, which is controlled by a lever handle mounted in the lower part of the starboard side of the cargo compartment between frames No. 2 and 3. In the rear part of the heater hood, there is a fire barrier separating the heater compartment from the fuel tank. In the heating mode, the heater fan takes air through the air intake of the heater hood and partially through the pipe from the cargo compartment. To accelerate heating (recirculation mode), air for the heater is taken only from the cargo compartment through the pipe, while the damper in the air intake is closed. Heated air from the heater is fed into the outlet distributor, in which the air is divided into two streams - into the cargo compartment and into the crew cabin. 2003113405 4ii | ii jii || lMpippMi of the cabin of the V64D 13/08 helicopter For heating the cargo compartment, heated air from the distributor enters the heating ducts, and, by a separate air duct, into the crew cabin. In ventilation mode, the heater fan turns on without supplying fuel to the heater. In this case, air is taken from the atmosphere through the air intake and is supplied (without heating) to the outlet distributor and then enters the cabs through the same channels as in the heating mode. Kerosene heater KO-50 is designed for heating and ventilation of the cockpit and cargo compartment of the helicopter. A kerosene heater includes a heater assembly on which a heater, a fan, two thermal switches, a thermal switch, two temperature sensors, a kerosene heater, a fuel box, two pneumatic relays, two temperature receivers, a temperature controller control unit, a temperature adjuster, a starting coil, a high-voltage wire are mounted connecting the heater plug to the starting coil. All the main units are placed on the outside of the starboard side of the fuselage in the cowl of the fairing, which is a continuation of the right fuel tank, except for the temperature setter, which is installed in the cockpit. The operation of the heater is as follows: in the combustion chamber of the heater after starting, the process of burning kerosene-air mixture occurs. The combustion products are discharged through the exhaust pipe. The heated walls of the heater are washed by air from the fan. Air draws heat from the walls of the heater, heats up and moves into the helicopter cockpits. The heater can work in automatic, manual, as well as in fan modes. When the heater is in automatic mode, the air temperature is kept constant depending on the position of the temperature setpoint. Manual control ensures that the heater operates at maximum (full) and medium heat production modes. The recirculation mode serves to accelerate the heating of the cabins in winter conditions with air intake from the cargo compartment of the helicopter.

Work in the fan mode provides cooling of the heater and ventilation of the helicopter cabins (through the box) in the warm season.

A relay is installed in the heater’s power supply circuit, which breaks the heater’s power supply circuit in the event of a fire in the kerosene heater compartment.

(MI-17 helicopter. Technical operation manual. Helicopter systems. Air conditioning - 21.00.00, Aviaexport,

USSR, Moscow, 1979).

For a comparative analysis with the claimed utility model, an air heater of the heating and ventilation system, which is equipped with the MI-8 helicopter (Helicopters-MI-8. Technical description. Book P. Design. Publishing house Mashinostroenie, M., 1970, is adopted. Chapter 14, p. 160 - 166) - 2. The system provides heated or atmospheric air to the crew cabin and to the cargo compartment in order to maintain normal temperature conditions in them. The air iodine heater of the heating and ventilation system (air heater) is a KO-50 kerosene heater, which is the main unit of the helicopter cabin heating and ventilation system. It includes a fan with an air intake, a heater, a distributor of heated air flow, a fuel box, control and control equipment, a fire system and an air, fire and fuel line with a fuel pump.

A fan with an air intake is installed in front of the air heater and is designed to suck in the outside air and supply it to the heater or to the ventilation of the cabs. v The heater consists of a combustion chamber, a heater with an air bypass pipe, a fuel heater, a spark plug and a nozzle: a fuel-air mixture burns in a combustion chamber, a heater is designed to heat cold air entering the heater, a fuel heater is used to heat kerosene, a glow plug is intended to ignite a combustible mixture of air and kerosene, the nozzle is used to spray kerosene entering the combustion chamber. The heated air flow distributor is designed for proportional separation of the air flow between the mains going to the crew cabin and to the cargo compartment. The fuel box is designed for compact placement of heater fuel equipment, which provides fuel filtering, maintaining a constant pressure in front of the nozzle, opening and closing fuel access to the combustion chamber, and bypassing part of the fuel from the nozzle. The control and control equipment includes temperature receivers, an electronic control unit for the actuator of the hot air temperature control system, a pneumatic relay to turn off the heating system in the event of a heater fan failure, and a DC power supply system. The principle of operation of the heater. During combustion of a kerosene-air mixture, hot gases are formed, which are discharged through the exhaust pipe. The heated walls of the heater are blown with cold air, which is sucked in by the fan from the atmosphere through the air intake. Air, taking heat from the walls of the heater, is heated and fed through the air ducts to the helicopter cockpits. Heater control, maintaining the set temperature and alarm are carried out automatically, as well as manually. The heater has three operating modes: maximum, medium and minimum. W The electric control system allows the operation of one fan without heating the air (fuel is off). The air heater is located on the outside of the starboard side of the helicopter in the hood body, which is a continuation of the right outboard fuel tank and an integral part of the helicopter fuselage. When repairing a heater or replacing it with an air conditioner in case the helicopter is relocated to areas with a hot climate, considerable time is required during which the helicopter is idle (does not work), in addition, the above-mentioned location of the heater on the fuselage makes it difficult to modernize the fuselage. The utility model solves the problem of expanding the operational capabilities of a helicopter. The task is achieved by the fact that in the air heater of the heating and ventilation system of the helicopter’s cabins, containing a hood, a fan with an air intake for sucking in external air and supplying it to the heater or to the ventilation of the cabins, the air intake damper, the heater, the heated air flow distributor between the mains to the crew cabin and into the cargo compartment, the fuel box with the fuel equipment of the heater, the fire system, the control and control equipment and the air, hot and fuel with a fuel pump for the highway, the air heater of the heating and ventilation system of the helicopter’s cabs is made up of two parts, one of which is a self-contained removable module, it contains a corncrank, inside of which it is disconnected1; a fan with an air intake for sucking in the outside air and supplying it to heater or for cabin ventilation, an air intake damper with an electromechanism, a heater, a heated air flow distributor between the highways to the crew cabin and to the cargo compartment, the hot system and the air, fire and fuel lines, and the second part is a W compartment with units permanently fixed to the helicopter fuselage in the continuation of the right fuel tank, and inside the compartment there is a fuel box with heater fuel equipment, control and control equipment, air, fire and the fuel line with the fuel pump of the line, while both parts of the heater on the air, fire and fuel lines of the hermetic connection to each other correspond yuschimi highways, which are closed by a removable protective cover. The essence of the utility model is illustrated in FIG. 1 - FIG. 3, where: FIG. 1a - FIG. 16 - Heater mounted on a helicopter. FIG. 1c - Mounting the removable module to the fuselage of the helicopter. FIG. 1d - Connection of pipelines of the fuel and fire systems of the removable module and compartment with units. FIG. 1e - Connection by means of a pipe of the air line of the pipe-distributor of the removable module to the pipe of the compartment with units. FIG. 2a - Actually heater (Removable module). FIG. 26 - FIG. 2c - Cross sections of the heater. FIG. For - Compartment with units mounted on a helicopter. FIG. 36 - A pipe for supplying heated air to the cargo compartment. FIG. Sv - Compartment with units (shown in enlarged view). Here: 1 - the heater itself (removable module); 2 - compartment with units; 3 - removable protective casing; 4 - pipe air line; 5 - the fuselage, 6 - the main fuel tank of the helicopter. In the body-hood 1 (Fig. 2) of the heater (removable module) there is an air intake 7 with a damper, a fan 8, a heater 9, a distributor 10 of warm air flow, a sensor 11 of the fire system, a spray gun 12 of the fire system, a drain tank 13 of the fuel system, pipelines 14 of the fuel system, air duct 15 for supplying warm air to the crew cabin and pneumatic relay 16. In the compartment 2 under the fairing 17 (Fig. 3) of the heater, the fuel pump 18, fuel box 19, pipelines 20 of the fuel system, control units 21 equipment, pipe 22 for supplying air to the cargo compartment and fire line 23. The principle of operation of the proposed air heater for the heating and ventilation system of the helicopter cockpits is similar to the principle of operation of the air heater for the heating and ventilation system of the helicopter MI-8 cabins, except that the air intake damper is not manually controlled , and remotely using an electromechanism. The removable module 1 (Fig. 1a - Fig. 1c) of the air heater of the helicopter’s cabin heating and ventilation system can be placed in any convenient place on the fuselage 5, for example, under its bottom, and the total longitudinal dimension of the right fuel tank 6 and the compartment with units 2 , the second part of the heater, which remains a continuation of the fuel tank, is significantly smaller than the total longitudinal size of the fuel tank and the hood body of the prototype heater, which is a continuation of the tank and an integral part of the fuselage of the MI-8 helicopter. The utility model, solved with the use of a removable module located under the bottom of the fuselage, extends the helicopter's operational capabilities by: -providing quick replacement of the heater module with air conditioning; - the possibility of placing an additional doorway on the starboard side of the helicopter, providing quick tactical or emergency leaving people from the helicopter.

Claims (1)

An air heater for the helicopter’s cabin heating and ventilation system, comprising a hood body, a fan with an air intake for sucking in external air and supplying it to the heater or to the ventilation of the cabins, an air intake damper, a heater, a heated air flow distributor between the mains to the crew cabin and to the cargo compartment, fuel box with heater fuel equipment, fire fighting system, control and control equipment, and air, fire and fuel equipment with a fuel pump landing gear, characterized in that the air heater of the helicopter cabin heating and ventilation system is made of two parts, one of which is a self-contained removable module containing a hood housing, inside of which there is a fan with an air intake for sucking in the outside air and supplying it to the heater or ventilation cabins, an air intake damper with an electromechanism, a heater, a heated air flow distributor between the highways to the crew cabin and to the cargo compartment, fire fighting system and air main, fire and fuel lines, and the second part is a compartment with units, permanently mounted on the fuselage of the helicopter in the continuation of the right fuel tank, and inside the compartment under the fairing there is a fuel box with fuel heater equipment, control equipment, air, fire and fuel the fuel pump of the line, while both parts of the heater on the air, fire and fuel lines are hermetically connected to each other by the corresponding mag lines that are closed with a removable protective cover.