RU165982U1 - DEVICE FOR DIESEL FUEL HEATING IN THE ZONE OF THE NET FILTER OF THE FUEL INTAKE - Google Patents

Abstract

A device for heating diesel fuel in the area of the strainer of the fuel intake, comprising a housing, a radiator, a heating element - a posistor, contacts, characterized in that the radiator of heat-conducting material is made in the form of a volumetric plate with fins in direct contact with the mesh filter of the fuel intake.

Description

A device for heating diesel fuel in the area of the strainer of the fuel intake

The utility model relates to mechanical engineering, in particular to engine building, and in particular, to auxiliary systems for thermal impact on fuel during operation of a car engine in conditions of low ambient temperature and can be used to facilitate the start of internal combustion engines.

Equipping cars with diesel engines is a priority, and the disadvantages of diesel fuel such as increased viscosity, low fluidity, poor atomization, incomplete combustion and increased fuel consumption contribute to the improvement of equipment for heating diesel fuel.

Equipping the fuel inlets with electric heaters makes it possible to start the engine in the cold season and, as a result, improve the performance of the vehicle’s fuel system.

A device is known for heating diesel fuel in a fuel intake (No. 224149, IPC F02M 31/125), comprising a flange and a cover, between which a sleeve, a filter mesh, a radiator with heating elements-resistors and a contact with a wire pressed to them are fixed by means of studs and nuts.

The disadvantages of this device are the low heat output, limited by the small heat exchange surface of the radiator, which depends on the size of the regular holes in the tank used to install the fuel intake grid. Posistors are able to heat the filter grid and free it from paraffins only when the engine is running, but the device is not able to create a reserve of heated fuel around the filter. A smaller part of the heated fuel remains inside the grid, and a large part rises from the radiator into the tank, taking away thermal energy and reducing the heating efficiency. When the engine is turned on, cold fuel is sucked in, which cools the grid. Fuel paraffin adheres to the net, limiting its throughput.

A known level sensor combined with an electric fuel heater DUKEP-90-24 / 0.2, manufactured by Concern KEMZ LLC (http://kizlvar-kemz.ru/category/produktsiya/grazhdanskaya/avtotovary), adopted as a prototype.

The heater contains a housing with a radiator in the form of a reinforced aluminum plate, two contacts, a posistor, located inside the filter (grid) of the fuel intake.

The posistor heated fuel intake performs the function of heating the fuel in the intake zone before starting the engine,

The posistor heating elements are ceramic-based with a positive temperature coefficient and have several advantages over metal or carbon heating elements.

Benefits include:

- the temperature mode of the heater does not depend on fuel consumption, ambient temperature and supply voltage;

- simplicity of design of the heating system, which does not require complex electronic temperature control circuits;

- high durability and reliability;

- minimum power consumption.

The design of this fuel intake, as well as the previous analogue, is not technologically advanced and does not provide sufficient fuel heating in the strainer zone to dissolve precipitated paraffin crystals. To remove contact with the radiator plate used in the prototype, additional conductive rivets are required.

The objective of the proposed technical solution is to increase the efficiency of dissolution of paraffin crystals that precipitate at low temperatures, and to improve the manufacturability of the product.

The technical result is the expansion of the temperature range of the use of diesel fuel as a result of creating a temperature in the area of the strainer of the fuel intake screen that exceeds the crystallization temperature of paraffins.

The problem is solved as follows, in a known device for heating diesel fuel, comprising a housing with a radiator, a heating element-posistor, contacts, a radiator made in the form of a volume plate with fins, of heat-conducting material, a heating element is pressed against its lower surface by a spring contact. The radiator fins are fitted with a strainer, i.e. they are in direct contact with the strainer.

Thus, the claimed result is achieved in that the radiator made of a heat-conducting material has fins in direct contact with the surface of the strainer; the heating element is also in close contact with the radiator, which provides more efficient heat transfer from the heating element-posistor, prevents deformation of the filter during fuel pumping, excluding direct contact of the posistor with the flow of diesel fuel.

In the prototype, fuel passes through cracks in the housing into the fuel intake pipe. There is a contact of moving diesel fuel with the surface of the posistor. In the proposed design, as described above, contact with moving fuel is excluded.

The design is more technological.

The proposed technical solution is illustrated by the following drawings:

FIG. 1 is a General view of the fuel intake with a device for heating diesel fuel in the area of the strainer of the fuel intake;

FIG. 2 - a device for heating diesel fuel in the area of the strainer of the fuel intake;

FIG. 3 - radiator

A device for heating diesel fuel in the area of the strainer of the fuel intake (1) contains a finned radiator (2) made of a heat-conducting material, for example, aluminum alloy, to the lower surface of which with the help of screws (7) a housing (5) is fixed with a spring contact riveted on it ( 6), which presses the heating element-posistor (3) to the surface of the radiator (2), the ribs of which are fitted with a strainer (4). The second contact (ground contact) is not indicated in the drawing.

A device for heating diesel fuel in the area of the strainer of the fuel intake works as follows.

Before starting the engine in the cold season, the voltage on-board network is supplied to the heating element-posistor (3). The posistor (3) and, with it, the radiator (2) quickly heat up. The temperature in the strainer zone rises and its mesh cells clogged with precipitated paraffin crystals are cleaned, providing the pumping of diesel fuel in the amount necessary to start the engine.

Thus, due to the implementation of the utility model:

- increased heat transfer from the posistor to the filter mesh through the fin radiator made of aluminum alloy;

- excludes contact of moving diesel fuel with the working surface of the posistor;

- eliminates the possibility of strainer strain due to exposure to a stream of diesel fuel.

The utility model can be used in the operation of diesel engines in any frost, for example, on KAMAZ vehicles.

Claims (1)

A device for heating diesel fuel in the area of the strainer of the fuel intake, comprising a housing, a radiator, a heating element - a posistor, contacts, characterized in that the radiator of the heat-conducting material is made in the form of a volume plate with fins in direct contact with the mesh filter of the fuel intake.

Images