JPH0233523A - Ignition device - Google Patents

Abstract

PURPOSE:To prevent a breaking loss of a heater member during its handling by a method wherein an ignition device having an ignition plug of an electrical resistor type heater is provided, at an outer circumference of the plug, with a protection cover which can be moved under a reaction of a spring. CONSTITUTION:A protection cover 2 is arranged among an igniting plug 3, a stick 4 supporting the igniting member and a cooling sleeve 1, and a spring 5 is arranged within the protection cover 2 as means for applying a function of advancing or retracting movement. When the plug 3 is inserted into an ignition position, the protection cover 2 may strike against a tapered part at an extremity end of a cooling sleeve 1 and the spring 5 is retracted to cause a heater member 9 of the plug 3 to be exposed from the protection cover 2. In turn, when the plug 3 is pulled out, the spring 5 is extended to cause the protection cover 2 to advance and to cover the plug heater member 9. When the stick 4 is completely pulled out of the cooling sleeve 1, it can be pulled out together with the protection cover 2. With this arrangement, it is possible to prevent a breaking loss of the heater member.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an ignition device for heavy oil burners used in boilers, etc., and in particular, to an ignition device having a structure suitable for preventing breakage of the heating element of an electric resistance type heating element igniter plug. °Regarding equipment.

[Conventional technology]

FIG. 6 is a cross-sectional view showing an example of a heavy oil burner used in a commercial boiler, which consists of a heavy oil atomizer 14 that sprays heavy oil 18, an impeller 151 that swirls combustion gas, an ignition torch 16, a flame detector 17, etc. Show that. 7th
The figure is a perspective view showing the appearance of an example of an ignition torch, and the tip of the ignition torch is equipped with an igniter 20. Moreover, FIG. 8 is a front view showing the configuration of the ignition torch, and the tip of the ignition torch is shown.

In addition to the igniter 20, there is also a gas nozzle 22 as an ignition fuel nozzle. It is comprised of a light oil nozzle 23, an impeller 24 dedicated to the ignition torch, an ignition detector 25, and the like. To ignite the heavy oil burner, first ignite the igniter 11, ignite the ignition fuel gas or light oil to form a flame at the tip of the ignition torch, and then input the heavy oil and combustion air to ignite the heavy oil burner. The procedure is to ignite the .

FIG. 9 is a partially sectional side view showing the structure of an igniter plug using a ceramic heating element, including a heating element heating section 26, a heating element terminal section 27, an electrode terminal 28. In this case, the electrode terminal 28 is made of an insulating material 29, a sealing material 30, etc.
energized from the heating element terminal part 27 to the heating element heating part 2
A method of making 6 red hot is adopted. In addition, when using this type of igniter plug, the electrode joint should be heated to 700°C.
To prevent the temperature of the electrodes and electrode terminals from rising above the heat-resistant temperature even if they receive heat radiation from inside the furnace.
As in the case of a conventional discharge type ignition device, as shown in FIG. 10, a cooling sleeve 31 is provided around the outer periphery of the ignition device. However, in this case, igniter plug 3
2 into the cooling sleeve 31, it often happens that the plug hits the insertion hole and damages the heating element.

Further, as an example of an ignition device using a ceramic heating element, as shown in FIG. 11, one having a structure in which a ceramic heating element 35 is housed in a sleeve 39 made of heat-resistant steel is commercially available. In this case, the sleeve 39 is provided with an air hole 41, and the atomized fuel flows through the air hole 41.
It is configured to ignite upon contact with the heating element 35. In this structure, since the heating element 35 is housed in the sleeve 39, it will not break due to impact, but the sleeve 39 may be exposed to flame and burnt out, or if the fuel is gaseous fuel, Although the influence is small, in the case of liquid fuel, there is a problem that it tends to be difficult to ignite due to the influence of the sleeve 39.

[Problem to be solved by the invention]

As described above, in the prior art, in particular when a ceramic heating element is used as an igniter plug, sufficient consideration has not been given to preventing breakage of the ceramic heating element, which has low strength against impact.

In addition, the 11th unit has a ceramic heating element housed inside the sleeve.
In an ignition device with the structure shown in the figure, burnout of the sleeve itself and deterioration of ignition performance were unavoidable.The purpose of the present invention is to provide an ignition device that uses a ceramic heating element without deteriorating ignition performance. Another object of the present invention is to provide an ignition device having a structure that can prevent breakage of the heating element.

[Means to solve the problem]

Here, let us consider the cause of breakage of the heating element of the igniter plug in the ignition device in the prior art, for example, the example of the ignition torch shown in FIG.

(1) When inserting the igniter plug into the ignition torch, the plug must be placed against the insertion hole, (2) The stick that supports the igniter plug is long (~4 m), so it is easy to hit the plug, (3) The igniter plug The problem is that the igniter plug is more likely to break when the igniter plug is installed or inspected, rather than being broken during use due to the plug being dropped during replacement.

Based on these facts, the above purpose is to provide a protective cover between the igniter plug, the stick that supports it, and the cooling sleeve, so that when the igniter plug is inserted to the ignition position, the protective cover retreats and the tip of the plug is exposed. This is achieved by having a structure in which the protective cover moves forward to a position where it covers the igniter plug when the plug is exposed and the plug is pulled out, and a spring is provided within the protective cover as a means for giving the protective cover the ability to move forward and backward. can do.

[Effect]

By configuring the ignition device as described above, when the igniter plug is inserted to the ignition position, the protective cover hits the tapered portion at the tip of the cooling sleeve, and as the spring is compressed, the heating element of the igniter plug is exposed from the protective cover. Furthermore, when the igniter plug is pulled out, the spring stretches and the protective cover moves forward, covering the igniter plug heating element and playing a protective role.

〔Example〕

EXAMPLES Hereinafter, the ignition device of the present invention will be described in more detail with reference to Examples.

Embodiment 1 FIGS. 1 and 2 are side sectional views showing the general structure of a first embodiment of the ignition device of the present invention, in which a cooling sleeve 1. Protective cover 2, igniter plug 3゜Stick 4 that supports the igniter plug, guide 6 that positions the spring 5 and stick 4 at the center of the cooling sleeve 1, slide 7 for pushing the protective cover 2 through the spring 5, slide Screw 8 for fixing 7 to stick 4
゜It is shown that the igniter plug consists of a heating element 9 etc. fixed to the tip of the igniter plug 3. Fig. 1 shows the igniter plug when it is pulled out, and Fig. 2 shows the igniter plug when it is inserted to the ignition position. In the state shown in FIG. 1, the heating element 9 is housed within the protective cover 2, and in the state shown in FIG. 2, the heating element 9 is exposed outside the cooling sleeve 2.

Here, the protective cover 2 has a structure as shown in FIG. 3(a) (side view), and has a cutout window 11 in the part where the heating element 9 is housed when the igniter plug is pulled out. , it has a structure that allows the heating element 9 to be seen from the outside (Figure (b) shows the A-A parent diagram of (a)).
This cutout window 11 is effective since it is not necessary to remove the protective cover when testing the temperature of the heating element 9 by operating the igniter on a trial basis.

In addition, the guide 6 is connected to the
As shown in the parent figure), it is attached to the protective cover 2 by welding so as to pass through the protective cover 2, and its upper end is attached to the inner wall of the cooling sleeve 1, and its lower end is attached to the outer wall of the stick 4. , and serves to position the stick 9 at the center of the cooling sleeve 1, and is structured to slide on the contact surface with the cooling sleeve 1 and the stick 4 when inserting or withdrawing the igniter.

In addition, at the part where the protective cover 2 meets the slide 7,
As shown in FIGS. 3(a) and 3(d) (C-C parent diagram of (a)), a slit 12 is provided through which a part of the slide 7 passes, and the slide 7 is inserted into or removed from the igniter. The penetrating portion is allowed to move within the slit 12. When the stick 4 is completely pulled out from the cooling sleeve 1, the penetrating part of the slide 7 catches one end of the slit 12 of the protective cover 2, and the stick 4 is removed from the ignition device. There is no chance of breaking the heating element at the tip of the igniter plug when pulling it out.

Next, FIG. 4 is a cross-sectional view showing the detailed structure of the slide 7 (
In a) and side view (b) the slide 7 has a protective cover 2
a protrusion 7' penetrating through and contacting the inner wall of the cooling sleeve 1;
It consists of a cylindrical portion 7' into which the spring 5 is pushed, and a screw hole 13 through which the slide 7 is fixed to the stick 4 with a screw 8.

By fixing the slide 7 to the stick 4, the reaction force of the spring 5 is stopped when the igniter is inserted, and the protrusion 7' of the slide is prevented when the igniter is pulled out.
By hanging on the protective cover 2, the protective cover 2 can also be pulled out at the same time. Note that there is a method of fixing the slide 7 to the stick 4 by welding, but in consideration of replacing the igniter plug, it is more convenient to be able to remove the protective cover, so we decided to fix it with screws.

The spring 5 only needs to be strong enough to withstand the gravity of the protective cover 2, and since the temperature of the air flowing inside the cooling sleeve 1 is usually below 100°C, it should be made of a special material. You don't have to choose. Further, the spring 5 does not need to be fixed to the guide 6 and slide 7.

In addition, in this embodiment, the spring 5 is connected to the protective cover 2.
Although a structure provided between the cooling sleeve 1 and the protective cover 2 is shown, a structure provided between the cooling sleeve 1 and the protective cover 2 is also possible. However, in the structure of this embodiment, the cooling air mainly flows between the cooling sleeve 1 and the protective cover 2, so providing the spring 5 between the cooling sleeve 1 and the protective cover 2 prevents the flow of cooling air. This is not desirable as it will interfere with the operation.

Example 2 The structure of another embodiment of the ignition device of the present invention is shown in FIG.

As seen in the side sectional view (a) of the same figure.

In the case of this embodiment, the diameter of the protective cover 2 is made small so that it comes into direct contact with the stick 4, and the spring 5 is provided between the cooling sleeve 1 and the protective cover 2. Furthermore, in the case of the first embodiment, the protective cover 2 Although it has a structure in which a slit 12 is provided and a slide 7 passing through the slit 12 is provided, this part is replaced with a screw 8. The detailed structure of the screw 8 part of the same figure (a) is shown in the same figure (b), and the same figure (c) shows the A-A parent diagram of (b). The function and operation of the ignition device having the structure of this embodiment are the same as those of the first embodiment.

The effect of the structure of this embodiment is that the ignition torch includes a gas nozzle, a light oil nozzle, and an impeller in addition to the ignition device.

Since components such as a flame detector are included, the diameter of the cooling sleeve can be made as small as possible to meet the demand for housing the ignition torch in a compact form.

〔Effect of the invention〕

As described above, in an ignition device using an electric resistance type heating element igniter plug, by using the ignition device having the configuration of the present invention, the problems of the conventional technology can be solved and the ignition performance can be reduced. Therefore, it was possible to provide an ignition device that can prevent the heating element from breaking during handling.

[Brief explanation of the drawing]

1 and 2 are side sectional views showing the structure of the first embodiment of the ignition device of the present invention, FIG. 3 is a detailed view showing the structure of the protective cover in FIGS. 1 and 2, and FIG. The figures are detailed views showing the structure of the slides in Figs. 1 and 2, Fig. 5 is a view showing the structure of the second embodiment of the ignition device of the present invention, and Fig. 6 is a schematic diagram of an example of a heavy oil-fired burner. 7 is a perspective view showing the appearance of an example of an ignition torch, FIG. 8 is a front view showing the structure of an ignition torch, and FIG. 9 is a structure of an igniter plug using a ceramic heating element. FIG. 10 is an explanatory view of an igniter plug having a cooling sleeve, and FIG. 11 is a cross-sectional view showing the structure of an example of a commercially available ceramic igniter housed in a heat-resistant steel sleeve. 1... Cooling sleeve 3... Igniter plug 5... Spring 7... Slide 7'... Cylindrical portion 9... Heating element 11... Notch window 13... Screw hole 15... Impeller 17... -Flame detector 19...Air 21...Extraction device 23...Light oil nozzle 25...Flame detector 27...Heating element terminal portion 29...Insulating material 31...Cooling sleeve 33...・Stick 35... Ceramic heating element 36... Electrode 2... Protective cover 4... Stick 6... Guide 7'... Protrusion 8... Screw IO... Taper part 12. ... Slit 14 ... Heavy oil atomizer 16 ... Ignition torch 18 ... Heavy oil 20 ... Igniter 22 ... Gas nozzle 24 ... Impeller 26 ... Heating element heating section 28 ... Electrode terminal 30 ... Sealing material 32 ... Igniter 34 ... Wiring rod 37 ... Electrode 38 ... Wiring rod 40 ... Insulator 39 ... Heat-resistant steel sleeve 41 ... Air hole

Claims (1)

[Scope of Claims] 1. An ignition device using an electric resistance heating element igniter plug, characterized in that a protective cover movable by the reaction force of a spring is provided around the outer periphery of the igniter plug. 2. The ignition device according to claim 1, wherein the protective cover is a protective cover provided with an inspection window for inspection and measurement of heat generation temperature at the tip. 3. Claim 1, wherein the protective cover is movable by compressing a spring using a slit hole provided in the cover and a sliding component passing through the slit hole. and the ignition device according to paragraph 2.