JPS6252320A - Ignition device - Google Patents

Abstract

PURPOSE:To shorten an assembly time and make workability simple with reduction in the number of parts by fixing surely an ignition electrode and a flame rod which have insulators formed as one body to a mounting base plate with one screw and one hold plate. CONSTITUTION:A flame rod 7 and an ignition electrode 6 which have insulators 2a, 2 formed by square column parts 3 at the center and circular columns at both sides of the square column and a mounting base plate 20 which has inverted L-shape cut and raised parts 21, 21a at the both ends of the plate and has holes 22, 22a through which said insulator's circular parts are inserted at the inside of the cut and raised parts and also has a screw hole 23 between said two holes, are installed. At a hold plate 24 one side is opened and two insertion parts 26, 26a through which said square columns 3 are installed, cutout parts 27, 27a through which circular columns 4 are inserted and which are cutout from said open side, a hole 28 facing a screw hole 23, and holding pieces 25, 25a which are held by support parts 21, 21a, are formed in one body and a screw 29 which passes through the hole 28 in the hole plate and is fixed to the screw hole 23 in the mounting base plate 20 to attach the hold plate 24 to the base plate, is installed.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an ignition device that has a simplified fixing structure between an ignition electrode and a flame rod used in an ignition part in combustion equipment such as a water heater with a bathtub. .

Conventional technology In recent years, igniters have been installed near the top of the burner nozzle, and are equipped with an ignition electrode that sends a spark discharge to the burner, and a pilotless system that uses a pilotless method to save energy by transmitting flame current that flows through the flame between the ignition device and the burner. and a flame rod that detects the presence or absence of combustion.

- An example of the conventional ignition device mentioned above will be explained below with reference to the drawings. 1 is an ignition device.

2.2a is an insulator consisting of a prismatic portion 3 at the center and cylindrical portions 4 at both ends, and has an ignition electrode 6 at the center and a frame rod 7 which is fixed thereto. 5゜S & is insulator 2.2a
The ignition electrode 6 and flame rod 7 holding plate hold down the
A fitting part 13 having a hole 1o through which the cylindrical part 4 of the insulators 2, 2a passes through on the upper surface and into which the prismatic part 3 is fitted, a locking piece 9 at one of its ends, and a fixing piece 14 at the other end. There is. 8
are holes 16 for hooking the locking pieces 9 of each holding plate 5, 5&, holes 1e penetrating the cylindrical part 4 of each insulator 5.5a of the ignition electrode 6 and frame rod 7, and a hole 1e of each holding plate 6.52L. This is a mounting board having a hole 17 into which a screw 11 for fixing the fixing piece 14 is screwed.

The attachment force between the ignition electrode 6 and the frame rod 7 will be explained regarding the ignition device configured as described above.

An ignition electrode 6 and a flame rod 7 are inserted into each hole 16 of the mounting board 8.
Insert the cylindrical portions 4 of the insulators 2, 2a, and hook the locking pieces 9 of the two presser plates 5, 5a into the holes 15 separately, and attach the fitting portions 13 of the presser plates 5, 51L to the prismatic portions 3. Once fitted, the cylindrical part 4 of the insulator 2.21L is passed through the hole 1o, and the fixing piece 14 and the screw 11 are screwed into the hole 17, and the holding plate 5.
5& was fixed, and the frame rod 7 and ignition electrode θ were attached.

Problems to be Solved by the Invention However, in the above configuration, the two presser plates 5 and 6
&, the number of parts increases, such as screw 11, hole 17, etc.
Furthermore, since the ignition electrode 6 and the frame rod 7 are fixed to the mounting board in close proximity to each other, assembly is time-consuming and costs are also reduced, resulting in the problem that the ignition device cannot be made more compact.

In view of the above problems, the present invention provides a holding plate that can securely fix the flame rod and ignition electrode with a single screw, thereby reducing assembly time by reducing the number of parts and simplifying workability. This provides a more compact and inexpensive ignition device.

Means for Solving the Problems In order to solve the above-mentioned problems, the ignition device of the present invention includes a frame rod and an ignition electrode each having an insulator integrally formed with a prismatic section in the middle and cylindrical sections on both sides. a mounting board having a screw hole between the holes through which the cylindrical part of the insulator is inserted, and a mounting board having an opening on one side, and the insulator two fitting portions into which the prismatic portions are accommodated; a cut is made into the fitting portion from the opening side;
A notch in which the cylindrical part of the insulator is housed, a hole B facing the screw hole between the fitting parts, and an engagement that is located at both ends in the longitudinal direction outside the fitting part and engages with the notched part. Insert the joint piece into a holding plate integrally formed and hole B of this holding plate,
According to the above method, the frame rod and the ignition electrode are inserted into the holes of the mounting board, and the screws are fixed to the screw holes of the mounting board to attach the holding plate. Fit the fitting part to the cylindrical part of each insulator to the prismatic part, and then engage the engaging piece of the holding plate to the cut-out part of the mounting board, and then fix the center of the holding plate to the mounting board with a screw. It is something to do.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3. Incidentally, the ignition electrode 6, the frame rod end, and the insulators 2, 211 thereof are the same as those in the prior art described above, so the same reference numerals will be given to them, detailed explanation will be omitted, and different parts will be explained. 2o is a flat mounting board with inverted cutouts 21 on both ends.
,21! L, and the insulator 2 on the inside of this cut and raised part,
It has a hole 22, through which the cylindrical part 4 of 2& is passed, and a screw hole 23 between this hole. Reference numeral 24 denotes a presser plate made of an elastic material, and has flat engagement pieces 26, 26& on both ends that engage the cut-out portions 21, 211L from the inside, and one side that is opened one side higher than the engagement pieces. , and the prismatic portion 3 of the insulator 2.2a
is a square box-shaped fitting portion 26.26 that is fitted from the opening side.
&, the upper surface of the fitting portion 26° 26a is cut in a υ shape from the opening side to form a notch 27° 271L into which the columnar portion 3 of the insulator 2.21L is fitted, and the fitting portion 26, 262
A hole 28 is integrally provided between the engagement pieces 25 and 251L on the same plane as the engagement pieces 25 and 251L. And the fitting part 26
．． The depth of 26 turtles is shallower than the height of the prismatic portions 3 of the insulators 2 and 2a. 29 is a screw for attaching the holding plate 24 to the mounting board 2σ.

In the above embodiment, the hole 22°221L of the mounting board 2o
The ignition electrode 6 and each insulator 2 of the frame rod 7, . 21L
Insert the cylindrical part 4 and place the prismatic part 3 on the mounting board 20. Next, the fitting portions 26.26& of the holding plate 24 are fitted into the prismatic portions 3 of each insulator 2, 2a from the opening side thereof, and the cylindrical portion 4 of each insulator 2.21L is fitted into the cutout portions 27, 27fL in the same manner. The engagement pieces 25, 2 of the presser plate 24
5& is engaged with the cut and raised portions 21, 211L. Finally, pass the screw 29 through the hole 28 of the holding plate 24 and screw it into the screw hole 23 of the mounting board 20. Then, the fitting portion 26.2 of the presser plate 24
6! L is placed on the square column part 3 of the insulators 2, 2&, and the mounting board 2o
Since the screws 29 are more floating, when the screws 29 are strongly tightened, the reaction force of the elastic force of the holding plate 24 acts on the engaging pieces 25.25a at both ends, and the engaging pieces 25.2 are attached to the cutouts 21, 211L from the inside.
5& will make a strong pressure contact.

Effects of the Invention As described above, according to the ignition device of the present invention, the following effects can be obtained.

- The ignition electrode and flame rod can be securely fixed with one screw and one holding plate, and the assembly time and workability can be simplified by reducing the number of parts.

■ Compact and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an ignition device according to an embodiment of the present invention, FIG. 2 is a top view of the same, FIG. 3 is a side view of the same, and FIG. 4 is a longitudinal cross-sectional view of a conventional example. 2.2 &...Insulator, 3...Prismatic section, 4
......Cylindrical part, 6...Ignition electrode, 7...
...Frame rod, 2゜...Mounting board,
21,211L... Cut and raised part, 22゜22&...
...Hole, 23...Screw hole, 24...
・・Press plate, 25,251L・・・・Engagement piece, 26
, 261L... Fitting portion, 27, 271...
・Notch, 28...hole B, 29...screw. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
11 yen a group 6 --- heat detection pole 7 --- frame hood 22, 22 a --- g A 23-11 bis. 2 Figure 3 Figure 4

Claims (1)

[Claims] A flame rod and an ignition electrode have an insulator with a square column part in the middle and a column part on both sides, and an inverted L on both ends.
a hole A through which the cylindrical part of the insulator is inserted inside each cut-out part, a mounting board having a screw hole between the holes, and a prismatic part of the insulator that is open on one side. two fitting parts into which the fitting parts are fitted, a notch in which the fitting part is cut from the opening side and into which the cylindrical part of the insulator is fitted, a hole B facing the screw hole between the fitting parts, and the fitting part. A holding plate integrally formed with engaging pieces that engage with the cut and raised portions is provided on both longitudinal ends of the joint, and the holding plate is inserted into the hole B of the holding plate and fixed to the screw hole of the mounting board. Ignition device with screws for attaching the holding plate.