RU2329393C1 - Glowing plug for heating device - Google Patents

Abstract

FIELD: engines and pumps .

SUBSTANCE: invention relates to engine construction and can be used in heaters intended for warming up the internal combustion engines at lower temperatures. The invention novelty consists in that the glowing plug intended for diesel fuel heater incorporates a metal body, a current conducting bush an electrode, an insulator bush, a heating helical coil, a ceramic base with lengthwise channels. The said channels can be furnished with a widening part in the lengthwise section directed from the metal body to the ceramic base free, or they can be helical with direction opposite to the coil helix.

EFFECT: glowing plug higher efficiency ensured by ignition of fuel-air mix at lower warming-up temperatures.

2 cl, 1 dwg

Description

The invention relates to engine building and can be used in heaters for heating internal combustion engines at low temperatures.

Known electric glow plug to facilitate the start of a diesel engine, comprising a housing located in the cylinder head bolt socket, and a heating element located in the combustion chamber. The candle is equipped with a drive made in the form of a heat-sensitive element placed in the head socket between its bottom and the candle body (AS No. 914800, F02P 19/02, published. 1982).

The disadvantage of this candle is that it contains additional control devices that reduce functional reliability during repeated engine starts.

Known glow plug containing a Central electrode with an insulator, a heating element made in the form of coaxially arranged spirals with the formation of an annular gap between them (AS No. 1521905, F02P 19/02, published. 1989).

The disadvantage of this candle is its low functional reliability due to the absence of channels (transparency of the annular gap) and, therefore, the difficulty of ignition during starting conditions when the cold fuel mixture is not ignited, and due to the cooling of the working part of the heating element by the flowing fuel mixture .

Closest to the proposed one is a candle, consisting of a hollow body, a current-carrying sleeve installed in it, in which an electrode is fixed by insulation, at one end of which a ceramic base with external longitudinal channels is installed in the gap between the sleeve. At the other end there are metal washers and a nut, a heating helical spiral coil wound on a ceramic base, one end of which is connected electrically to the electrode, the other is connected electrically to the sleeve. A metal washer is installed on the opposite end of the sleeve and an insulating washer is located between the sleeve and the metal washer (TU 4573-004-075-10218-2001, drawing number IGUR. 387524.201-02 SN-04-02).

The disadvantage of this candle is the lack of efficiency, which reduces its reliability, since the heating element forms channels of equal cross-section with the insulator, which leads to intensive cooling of a separate section of the heating element to which the main flow of the fuel mixture is directed.

The objective of the invention is to increase the efficiency of a glow plug for a heating device by igniting the fuel-air mixture at a lower heating temperature.

The objective is achieved in that in a glow plug for a diesel fuel heating device comprising a metal housing, a current-carrying sleeve, an electrode, an insulating sleeve, a ceramic base with longitudinal channels, a heating helical spiral coil, in contrast to the prototype, the longitudinal channels of the ceramic base are made with expansion in longitudinal section in the direction from the metal casing to the free end of the ceramic base.

In addition, the longitudinal channels of the ceramic base can be made helical, with the direction opposite to the helix screw.

The invention is illustrated in the drawing.

The drawing shows the proposed glow plug for a heating device, which consists of a metal casing 1 installed in it through the insulation 2 of the current-carrying sleeve 3, into which an electrode 5 is fixed through the insulating sleeve 4, on one end of which a ceramic base is installed in the gap between the current-carrying sleeve 3 6 with external longitudinal channels, and metal washers 7, 8 and nut 9, of a heating helical spiral coil 10, wound on a ceramic base 6, are installed at the other end, one end to Torah electrically connected to the electrode 5, the other is connected electrically with a conductive sleeve 3, the opposite end of a conductive sleeve 3 is a metal washer 11. Between the sleeve 3 and the metal washer 11 is disposed an insulating washer 12.

A glow plug for a heating device operates as follows. When the heater starts, the jet of the air-fuel mixture enters the upper part of the glow plug for the heating device, flows in parallel flows in the volume of the glow plug for the heating device through the internal channels formed by the ceramic base 6 and the heating spiral coil 10.

The most favorable conditions for igniting the mixture are created in the first case when the mixture flows in the confined space of the candle, where the maximum temperature develops. Thus, ignition occurs in the area adjacent to the housing, in the channels formed by the rod and spiral of the heating element. Due to the expanding section of the channel, the flow velocity slows down, which improves the ignition conditions and accordingly increases the efficiency of the glow plug for the heating device.

Claims (2)

1. An glow plug for a diesel fuel heating device comprising a metal housing, a current-carrying sleeve, an electrode, an insulating sleeve, a ceramic base with longitudinal channels, a heating helical spiral coil, characterized in that the longitudinal channels of the ceramic base are made with expansion in the longitudinal section in the direction from the metal body to the free end of the ceramic base. 2. An glow plug for a heating device according to claim 1, characterized in that the longitudinal channels of the ceramic base are made screw with a direction opposite to the spiral screw.