RU13687U1 - IGNITION DEVICE - Google Patents

Description

Ignition device

The utility model relates to devices for ignition using heat obtained by means of electricity, and can be used to ignite oil and gas burners of boilers.

A known torch burner, for ignition of which a firing device is used, is an electrode igniter in the form of a pipe 1. This ignitor is used only for igniting a gas-air mixture.

Spirals made of materials having high electrical resistance are often used as heating elements. For example, a device for electric ignition of gas burners contains several of these spirals 2. Spiral heating elements are also widespread in ignition devices - glow plugs of diesel engines 3. For example, a glow plug is known that contains a hollow conductive sleeve housing inside which a conductive electrode and a spiral are coaxially placed filament, fixed between the housing and the electrode 4. A disadvantage of the known structures is the low durability of the spiral, especially in open structures, because the spiral undergoes erosion and corrosion under the influence of high temperature, pressure, high-speed flows of the burning fuel mixture.

As a prototype, a glow plug spark plug device was selected that contains a conductive tubular plugged housing, inside of which a conductive electrode and a columnar solid silicon carbide heating element are coaxially placed, and the element is installed between the electrode and the plugged end of the housing 5. To compensate for the difference in the linear expansion of the parts, graphite powder compensating elements. However, this design will not allow you to effectively compensate for linear expansion if the heating element is performed in an open version for igniting gas and fuel oil burners. With this embodiment, the reliability of the device will be relatively low.

IPC 7 F 23 Q 7/00

The purpose of the utility model is to increase the reliability of the ignition devices of gas and oil burners of boilers.

This goal is achieved by the fact that the ignition device comprises a conductive tubular muffled housing, inside which a conductive electrode and a columnar solid heating element are coaxially placed, the latter being installed between the electrode and the muffled end of the housing using a compensating element in the form of a spring pressing the electrode against the heating element. The electrode has the ability to move in the axial direction. A window is made in the housing in the area of the heating element, through which the air-fuel mixture comes into contact with the heating element. The use of a spring makes it possible to compensate not only for temperature linear expansion of the parts to increase the reliability of electrical contact, but also to compensate for the decrease in the length of the heating element due to the burning of the ends of the heating element from spark erosion at the contact points.

The heating element may be made of graphite or silicon carbide. It is possible to implement the device when the electrode and the housing are electrically connected to a step-down transformer having an annular core. In this case, the size of the transformer, and accordingly, the dimensions of the entire electric step-down and control device are significantly reduced.

The invention is illustrated by a drawing, in which Fig. 1 shows a main sectional view of a pilot light, and in Fig. 2 a transverse section in a diametrical plane.

The invention is illustrated by the example of a pilot burner of a fuel oil boiler.

The igniter consists of a metal casing 1, plugged with two covers 2 and 3 of PCB and metal, respectively. A metal electrode 4, strutted by a spring 5, is inserted into the cover 2 by landing with a gap 5. A carbon heating element 6 made of graphite with high electrical resistance is inserted into the cover 3. The electrode 4 is additionally supported by a washer 7 mounted inside the housing 1 for landing with a gap. Case 1 has four rectangular

windows 8. The housing 1 and the electrode 4 are connected to an electric current source (not shown). Instead of a coil spring 5, it is possible to use a disk spring or a set of disk springs.

The ignitor introduced into the combustion zone operates as follows. Before starting the boiler, voltage is applied to the housing 1 and electrode 4. After heating the element 6, fuel, for example fuel oil, is supplied to the burner spray zone. The resulting air-fuel mixture through the windows 8 is in contact with the heated element 6 and ignites, after which the voltage is turned off ..

Sources of information:

1. RF patent No. 2033575, 1995.

2. RF Application No. 94024843, publ. 1996.

3. Japanese application No. 59227999, 1984; Publication No. 61107013, 1986.

4. Certificate of the Russian Federation No. 4806, 1997.

5. Japanese application No. 53062947, 1978; Publication No. 54153935, 1989.

Claims (4)

1. An ignition device comprising a conductive tube muffled housing, inside of which a conductive electrode and a columnar solid heating element are coaxially placed, the latter being installed between the electrode and the muffled end of the housing using a compensating element, characterized in that the compensating element is made in the form of a spring pressing the electrode to the heating element, and the electrode has the ability to move in the axial direction, and a window is made in the housing in the area of the heating vital element.  2. The device according to claim 1, characterized in that the heating element is made of graphite.  3. The device according to claim 1, characterized in that the heating element is made of silicon carbide. 4. The device according to claim 1, characterized in that the electrode and the housing are electrically connected to a step-down transformer having an annular core.