RU84786U1 - HEATING DEVICE FOR RECYCLING TYPE FOR VEHICLE SALON - Google Patents

Abstract

Utilization-type heating device for the passenger compartment of a vehicle, using the heat of exhaust gases from a car engine as a source of thermal energy, consisting of a gas heat exchanger, a fan in the passenger compartment and connecting pipes, characterized in that a gas heat exchanger without an intermediate heat medium is used to heat the air, installed on exhaust pipe of a car engine and consisting of a central pipe and a box-shaped air duct, screwed onto the pipe by a screw howling lines with a gap between adjacent coils and connected to the air ducts and fans.

Description

The utility model relates to vehicle heating systems using the principle of heat recovery of engine exhaust gases.

For heating the passenger compartment, there are several varieties of heating devices that supply heated air to the passenger compartment.

The most widely modern level of technology in this area is represented by heating devices of the passenger compartment, the operation of which is based on the use of excess heat generated during operation of the internal combustion engine. In this case, as a coolant, as a rule, liquid is used from the engine cooling system circulating through pipelines from the engine through a special heat exchanger-radiator. The air blown through the radiator is supplied by the fan through a piping system into the passenger compartment.

Typical representatives of such heaters are structures installed on most modern cars and trucks.

The main disadvantage of this type of heating system is as follows: for each internal combustion engine there is a limit value for the amount of heat that must be removed from the engine through the cooling system. At a low ambient temperature, maintaining a comfortable temperature in the cabin leads to a violation of the thermal balance of the engine, lowering the operating temperature of the engine and, ultimately, to lowering its power.

This phenomenon can be compensated only by increasing fuel consumption.

There are also autonomous heating devices, independent of the cooling system of the car engine, and using liquid or gaseous fuel burned in a special chamber as a heat source.

A known design of an independent air heater (RU, 2233220 C1) operating on gaseous fuels. When the fuel is burned, the heat exchanger is heated, in which, in turn, the air supplied to the passenger compartment is heated.

The main disadvantage of such structures is the additional emission of combustion products polluting the atmosphere.

At the same time, the car has an alternative source of heat, which can be used for heating the passenger compartment. This is an exhaust system, which is a system of pipelines connecting the exhaust pipe, resonator and silencer. Moreover, the temperature on the surface of the parts of the exhaust system during engine operation reaches 250-300 ° C, and the released heat energy is uselessly dissipated into the surrounding space.

Known designs of heaters, the work of which is based on the utilization of excess heat from the exhaust system of a car engine.

So, in the RF patent for utility model No. 14893, a vehicle’s heating device with a heat exchanger is described, which is located on the exhaust pipe silencer, and liquid is used as a heat transfer fluid through a piping system to a secondary heat exchanger located in a heated car interior.

The closest in technical essence to the proposed solution is the vehicle heating system according to the patent RU 2187435. The vehicle heating system operates on an intermediate coolant and contains an expansion tank, an intermediate coolant pump, a gas-liquid heat exchanger, a heater with a fan in the vehicle interior and connecting pipelines.

The disadvantages of this type of device include:

- firstly, the possibility of overheating of the liquid coolant when the secondary heat exchanger is turned off,

- secondly, an increase in the dimensions and mass of the muffler, as well as the need for constant monitoring of the level of liquid coolant in the primary heat exchanger.

- in addition, the presence of two heat exchangers significantly reduces the efficiency heating device.

Analysis of the considered designs of heating devices allows us to formulate the principles of the proposed technical solution as follows:

1. The heating device should be placed on the exhaust tract of the car engine and use fuel combustion products emitted into the atmosphere as a heat source.

2. In order to reduce weight, dimensions and increase reliability, the heating device must operate without an intermediate coolant with the supply of air preheated in a gas heat exchanger to the vehicle interior.

3. The design of the gas heat exchanger should exclude the possibility of exhaust gases entering the heated air.

4. When turning off the supply of heated air to the vehicle interior, an active heat removal from the gas heat exchanger must be provided.

The objective of the proposed technical solution is aimed at improving the efficiency of the device and operating culture by changing the design of the heating device.

The problem is solved in that in a heating device of a recycling type for the passenger compartment of a vehicle, using the utilized heat of exhaust gases of a car engine as a heat source, consisting of a gas heat exchanger, a fan in the passenger compartment and connecting pipelines, we use a gas heat exchanger without an intermediate heat carrier to heat the air mounted on the exhaust pipe of a car engine and consisting of a central pipe and a box duct, wound a tube along a helical path with a gap between adjacent coils and connected to the air ducts and fan their flanges.

When the fan is turned off, excess heat is removed from the heat exchanger due to the cooling of the outer surface of the coils of the spiral pipeline by the high-speed air pressure when the car is moving.

Thus, it is proposed to use the heated parts of the exhaust system as a heat source for the heating system of the passenger compartment.

The utility model is illustrated by the following drawings:

Figure 1 - Diagram of a heating device of the utilization type for the passenger compartment of the vehicle;

Figure 2 - Heat exchanger-utilizer of the heating device of the utilization type for the passenger compartment of the vehicle.

The proposed heating device of the utilization type for the vehicle interior consists of the following main parts: a gas heat exchanger (2) installed by tapping on the exhaust pipe (1) of the car engine and including the central pipe (3) around which solid seams are welded along the helical line (for ensuring complete separation of the gas cavities of the heat exchanger) two-way screw, closed from the outer screw surface and forming a helical box cavity (4).

When exhaust gases pass through the central pipe (3) of the heat exchanger (2), the lateral screw surfaces of the helical box cavity (4) are heated with a radial temperature gradient. The air pumped through the pipeline (5) by the fan (6) passes through the helical box cavity (4), heats up and flows through the pipeline (7) into the car interior. To ensure heat removal from the heat exchanger (2) with the fan turned off (6) between the turns of the screw box cavity (4), axial clearances are provided, and the outer surfaces of the coils of the spiral pipeline are cooled by the high-speed air pressure when the car is moving.

Thus, due to the installation of the heat exchanger on the exhaust pipe, the air blown through the heat exchanger casing by the fan heats up when it comes into contact with the heated fins of the heat exchanger and is supplied to the passenger compartment through the piping system. At the same time, heat recovery is used for heating, which is uselessly dissipated into the atmosphere by the heated parts of the engine exhaust system.

Claims (1)

Utilization-type heating device for the passenger compartment of a vehicle, using the heat of exhaust gases from a car engine as a source of thermal energy, consisting of a gas heat exchanger, a fan in the passenger compartment and connecting pipes, characterized in that a gas heat exchanger without an intermediate heat medium is used to heat the air, installed on exhaust pipe of a car engine and consisting of a central pipe and a box-shaped air duct, screwed onto the pipe by a screw howl line with a gap between adjacent coils and connected to the air ducts and fans.