JP3660189B2 - Igniter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an igniter for a combustion appliance that is used as an ignition source for a burner such as a heating appliance or a water heater using oil or gas.
[0002]
[Prior art]
Generally, an igniter is composed of a case made of synthetic resin and a discharge electrode part made of metal, and an electronic component for generating a high voltage is mounted on the wiring board inside the case. ing. If necessary, the electronic component mounted on the wiring board is molded by filling the inside of the housing with a polyurethane resin. The housing has an input terminal and an output terminal. A primary voltage is applied to the input terminal as a power source for the electronic component. The output terminal receives the primary voltage and receives a high voltage from the secondary side. Output. Although not shown, the high voltage generated from the secondary side is supplied to the discharge electrode unit, and the fuel is ignited by generating a spark discharge in the sprayed fuel supplied from the burner. is there. For example, in an oil fan heater, when a power switch is turned on, the power of the burner is turned on, and fuel oil is sprayed into the air. Subsequently, the power of the igniter is turned on, and a high voltage of about 20 KV peak is generated from the output terminal of the igniter. The high voltage is supplied to the discharge electrode part, and a spark discharge is generated in the discharge part. There is a gap between the discharge section and the burner, and the spark discharge is received to ignite petroleum, which is fuel sprayed in the air. When the fuel of the burner is ignited, the temperature is detected by a sensor, and the ignition is surely detected. After a predetermined time has elapsed, the igniter is turned off.
[0003]
A conventional igniter is shown in FIG. 5, and in FIG. 5, which shows a cross-sectional view of the high voltage output unit 18 and a side view of the discharge electrode unit 30, the high voltage output unit 18 includes the case 12 of the igniter 10. A through hole 22 is formed. The casing through-hole 22 is formed with a casing wall surface 26 as a partition wall on the outer periphery of the casing through-hole 22 in order to ensure an insulation distance from the outside. A screw 14 is inserted from the inside of the housing through-hole 22 to the outside of the housing through-hole 22 and fixed with a nut 16 on the outside. A spring terminal 20 is press-fitted into the upper portion of the nut 16 and is formed as a high voltage output portion 18 of the housing 12. A high voltage output lead 24 from a wiring board (not shown) is connected to the inside of the housing 12 of the screw 14.
[0004]
Next, the configuration of the discharge electrode unit 30 of the igniter 10 will be described. In the discharge electrode portion 30, a discharge portion 40 for generating a high voltage spark discharge is formed at one end of the conductor portion 42, and a screw portion 34 is formed at the other end. An insulating part 38 is formed at an arbitrary position between the screw part 34 and the discharge part 40. The conductor portion 40 and the insulating portion 38 are fixed by integral molding, and an electrode connection portion 32 processed with an L-shaped metal plate is inserted into the screw portion 34. The electrode connection portion 32 is fixed by a nut 36. Has been. In addition, the discharge part 40 and the screw part 34 are comprised integrally with the conductor part 42, and the insulation part 38 is comprised with insulators, such as an insulator. The high voltage output unit 18 and the discharge electrode unit 30 are brought into contact with the spring terminal 20 by pressing the electrode connection unit 32 in the direction E of FIG.
[0005]
The high voltage output unit 18 and the discharge electrode unit 30 of the igniter 10 are formed in parallel with a certain gap on the back side in FIG. The two are paired and serve as the igniter 10. However, since the discharge part 40 forms a gap for performing spark discharge, the discharge part 40-40 is formed with a gap of 2 to 5 mm. Further, the spring terminal 20-20 and the electrode connection portion 32-32 for connecting a high voltage are connected by pressing the casing 12 and the discharge electrode portion 30, respectively.
[0006]
Next, the electrical operation of the casing 12 and the discharge electrode unit 30 of the igniter 10 will be described. Although not shown, a high voltage is generated by electronic components mounted on the wiring board, and the high voltage is supplied to the high voltage output leads 24-24. The high voltage is supplied from the high voltage output lead 24-24 via the screw 14-14 to the spring terminal 20-20, and the spring terminal 20-20 is pressed. The high voltage is further supplied to the discharge part 40-40 via the screw part 34-34 and the conductor part 42-42. Although the high voltage generated in the discharge unit 40-40 is not illustrated, a gap of 2 to 5 mm is formed between the discharge units 40-40, and spark discharge is started between the discharge units 40-40. The
[0007]
[Problems to be solved by the invention]
In the high voltage output unit 18 of the housing 12, although not shown, since the connection from the wiring board that outputs a high voltage is performed by the high voltage output lead 24, the stray capacitance of the high voltage lead 24 is As a result, the output voltage becomes unstable or decreases. Further, as described above, the high voltage output unit 18 is configured by inserting the screw 14 through the housing through hole 22 and assembling the nut 16 and the spring terminal 20. However, the assembling work takes time and efficiency. However, the cost was high due to the large number of parts.
[0008]
Also, in the discharge electrode portion 30, the electrode connecting portion 32 is fixed with the nut 36, or the screw portion 34 is formed on the other end of the conductor portion 42, so that inefficient work such as performing screw processing is performed. As with the high voltage output unit 18, the cost is high.
[0009]
The present invention has been made in view of the above problems, and aims to provide an inexpensive igniter 10 without simplifying the assembly of the high voltage output unit 18 and the discharge electrode unit 30 and degrading the performance. And
[0010]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, in the casing 52 and the discharge electrode portion 60 of the igniter 50 having a high voltage output, the casing 52 is fixed to a high voltage cylinder 55 and a high voltage coil. 58, directly connecting the high-voltage terminal 54 and the high-voltage coil 58, the discharge electrode portion 60 is provided with an electrode connection portion 62 at one end of the conductor portion 42, and the electrode connection portion 62 is inserted into the high-voltage terminal 54 An igniter is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an igniter according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a side view (both are partially cutaway sectional views). In FIG. 1, a casing 52 of an igniter 50 is formed of a synthetic resin, and an electronic component for generating a high voltage is mounted on the wiring board inside the casing 52, although not shown. If necessary, the electronic component mounted on the wiring board is molded by filling the inside of the casing 52 with a polyurethane resin. The igniter 50 is formed with an input terminal 53 and a high voltage terminal 54-54. A high voltage obtained by applying a primary voltage of the electronic component to the input terminal 53 and receiving the primary voltage and boosting it to the secondary side. Is output to the high-voltage terminals 54-54. In the embodiment of the present invention, when an AC voltage of 100 V is applied to the input terminal 53, a pulsed AC voltage having a peak of about 20 KV is generated at the high voltage terminals 54-54.
[0012]
The configuration of the high-voltage terminals 54-54 incorporated in the casing 52 of the igniter 50 will be described. 2A and 2B, which are enlarged views of the high-voltage terminal in FIG. 1, FIG. 3A is a side view, FIG. 2B is a front view, and FIG. The high-voltage terminal 54 is made of an elastic metal such as stainless steel or phosphor bronze, has a rectangular shape, has one end formed with a connection fixing portion 59 to be connected to the high-pressure portion, and the other end has a rectangular shape. It consists of an outer edge 86. As shown in the cross-sectional view of FIG. 3, the outer edge portion 86 has a first bent portion 80-80 and a second bent portion provided on an extension line of the first bent portion 80-80. An electrode abutting portion 84 for abutting when the elastic portion 90-90 constituted by the portions 82-82 and the electrode connecting portion 62-62 of FIG. 1 are inserted is provided. Two elastic portions 90-90 formed of the first bent portion 80-80 and the second bent portion 82-82 are formed symmetrically so that the electrode connecting portion 62 of FIG. It is supposed to be sandwiched from. The high voltage terminal 54 can be manufactured by bending a single elastic member.
[0013]
The high-voltage terminal 54-54 shown in FIG. 1 is inserted into the high-pressure cylinder 55-55 until a connection fixing portion 59-59 which is one end of the high-voltage terminal 54-54 comes into contact with the head. In the embodiment of the present invention, the insertion of the high-voltage terminals 54-54 and the high-pressure cylinders 55-55 is performed by press-fitting, but can be performed by welding, adhesion, installation of a removal preventing part, or the like. When the high-voltage terminal 54-54 is inserted into the high-pressure cylinder 55-55, the connection fixing portion 59-59 of the high-voltage terminal 54-54 enters the housing 52, and the terminal of the high-voltage coil 58 in the housing 52 Contact 57-57. The connection between the terminals 57-57 of the high voltage coil 58 and the connection fixing portions 59-59 is mechanically connected by soldering, welding, caulking or the like.
[0014]
Next, the configuration of the discharge electrode unit 60 of the igniter 50 will be described. The discharge electrode portion 60 is provided with two conductor portions 42-42 having an arbitrary electrode pitch 56, one end of the conductor portion 42-42 forms a rectangular electrode connection portion 62-62, and the other end is Discharge portions 70-70 constituted by gaps 72 having an arbitrary angle are formed. In order to fix the conductor part 42-42 at an arbitrary position near the center of the conductor part 42-42, an insulating part 68 made of an insulator or the like is integrally formed with the conductor part 42-42. In the embodiment of the present invention, the conductor part 42-42 has a round shape, and the electrode connecting part 62-62 has a round shape of the conductor part 42 formed into a rectangle by press working, and the discharge part 70- The tip of 70 is processed into a conical shape and spark discharge is likely to occur. Although the shape of the conductive portions 42-42 has been described as a round shape this time, it goes without saying that the present invention can be applied to a shape other than the round shape, such as a triangle, a square, a rectangle, and a polygon. In the embodiment of the present invention, the electrode pitch 56 is set to 20 to 28 mm, and the gap 72 is set to 2 to 5 mm.
[0015]
Next, a method for connecting the high-voltage terminals 54-54 of the casing 52 of the igniter 50 and the discharge electrode unit 60 will be described. The high-voltage terminals 54-54 of the casing 52 and the discharge connection portions 62-62 of the discharge electrode portion 60 are inserted in the direction D in FIG. In FIG. 4 showing an insertion example of the high-voltage terminal and the electrode connecting portion in FIG. 1, the elastic portion 90-90 is opened by the insertion of the electrode connecting portion 62 and is brought into contact with the electrode contact portion 84. In this contact state, the electrode connecting portion 62 and the elastic portion 90-90 of the high-voltage terminal 54 are held by the pressing of the first bent portion 80-80 and the second bent portion 82-82. The pressing holding force of the electrode connecting portion 62 is 9.8 to 19.6 N, and a holding force sufficient for use in the present invention is ensured.
[0016]
Although the configuration and connection method of the casing 52 and the discharge electrode unit 60 of the igniter 50 of the present invention have been described, the electrical connection between the casing 52 and the discharge electrode unit 60 will be described below. When AC 100V serving as a power source is applied to the input terminal 53 of the casing 52, although not shown, a voltage is supplied to an electronic component mounted on the wiring board, and a pulsed AC high voltage of about 20 KV peak is supplied. A voltage is developed across the high voltage coils 58-58. The high voltage generated in the high voltage coil 58-58 is supplied to the high voltage terminal 54-54, and is further supplied from the high voltage terminal 54-54 to the electrode connection part 62-62 as shown in FIG. The high voltage supplied to the electrode connection portions 62-62 passes through the conductor portions 42-42 as shown in FIG. 1, and causes a spark discharge in the gap 72 of the discharge portions 70-70. Although not shown, the spark discharge ignites oil which is fuel sprayed from the burner in the air.
[0017]
【The invention's effect】
According to the present invention, the high voltage from the high voltage coil 58 can be transmitted in the shortest distance compared to the case 12 and the discharge electrode portion 30 of FIG. The problem of lowering is resolved. Moreover, in the conventional example, the high voltage output lead 24, the screw 14, the nut 16, and the spring terminal 20 were used to assemble the housing through hole 22 of the high voltage output unit 18, but according to the present invention, a high voltage Since the terminal 54 can be directly connected to the high voltage coil 58, the number of assembling steps can be reduced and the component cost can be greatly reduced. Also, for the discharge electrode portion 60, without using a nut as in the conventional example for the discharge connection portion 62, by integrally processing the conductor portion 42, it is possible to simplify the assembly of the discharge electrode portion 60, Similar to the assembly of the casing 52, the number of assembly steps and the cost of parts can be reduced.
[Brief description of the drawings]
1 is an igniter according to an embodiment of the present invention. FIG. 2 is an enlarged view of a high-voltage terminal in FIG. 1. FIG. 3 is a cross-sectional view taken along line AA of the high-voltage terminal in FIG. Example of insertion of connecting part [Fig. 5] Conventional igniter [Explanation of symbols]
In the figures, the same reference numerals represent the same or corresponding parts.
10, 50 Igniter 12, 52 Housing 14 Screw 16, 36 Nut 18 High voltage output 20 Spring terminal 22 Housing through hole 24 High voltage output lead 26 Housing wall 30, 60 Discharge electrode 32, 62 Electrode connection 34 Screw portion 38, 68 Insulating portion 40, 70 Discharge portion 42 Conductor portion 53 Input terminal 54 High voltage terminal 55 High voltage cylinder 56 Electrode pitch 57 Terminal 58 High voltage coil 59 Connection fixing portion 72 Gap 80 First bent portion 82 Second bent portion Installation part 84 Electrode contact part 86 Outer edge part 90 Elastic part

Claims (5)

In an igniter comprising a casing having a high voltage terminal and two discharge electrode portions , the casing includes a high voltage terminal and a high voltage coil fixed to a high voltage cylinder, and directly connects the high voltage terminal and the high voltage coil, The discharge electrode portion is provided with an electrode connection portion at one end of a conductor portion main body, and the electrode connection portion is inserted into the high-voltage terminal. At least one connection fixing portion, an outer edge portion of a rectangular parallelepiped, at least two elastic portions including first bent portions and second bent portions, and at least one electrode contact. The high-voltage terminal according to claim 1, further comprising a contact portion. 3. The high-voltage terminal according to claim 1, wherein the connection fixing portion, the outer edge portion, the elastic portion, and the electrode contact portion according to claim 2 are bent by a single elastic member. 2. The igniter according to claim 1, wherein, in the connection between the high-voltage terminal and the electrode connecting portion, the electrode connecting portion is sandwiched between at least two elastic portions. The discharge electrode part according to claim 1, wherein the conductor part and the electrode connection part are processed as a single body.

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