JPH0719471A - Electrode part - Google Patents

Abstract

PURPOSE:To realize an easy mounting operation, an easy electrical connection and the reduction of the number of parts required for the electrical wire connection with regard to an electrode part used for a flame detecting electrode and an igniting electrode for a combustion device in a boiler and the like and for a water level detecting electrode for a water level controlling device. CONSTITUTION:The title electrode part comprises an electrical insulator member 11, an electrode member 12 a tip of which protrudes from the insulator member 11, a flexible electricallyconductive member 13 electrically connected with another tip of the electrode member 12 and a flexible insulating protection tube 14 covering the connection part where the flexible electrically-conductive member 13 and the insulator member 11 are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an ignition electrode for a combustion device in a boiler or the like, a flame detection electrode, and
The present invention relates to an electrode component used for applications such as a water level detection electrode of a water level control device.

[0002]

2. Description of the Related Art For example, in a boiler, many sensors are used to perform automatic control for the purpose of improving safety and saving labor. Among them, the electrode component including the electrode portion, the insulator portion holding the electrode portion, and the terminal portion for wiring to the electrode portion is used as an ignition electrode and a flame detection electrode of the combustion device, It is often used as a water level detection electrode for water level control devices.

A premixed gas burner, which is a type of combustion device, in particular, a type in which a flame holder for ejecting the premixed gas to form a flame is provided on the side surface of a wind box for supplying the premixed gas. In the above, the electrode parts as described above are used as ignition electrodes (spark rods) and flame detection electrodes (frame rods), but these electrode parts shorten the protruding length of the electrode part. In order to do so, it is mounted close to the mounting portion of the flame holder.

Wiring to the electrode parts in this type of combustion device is required to prevent an explosion accident due to electric leakage, so that terminals, conductor portions of wiring and connecting portions of wiring are not exposed in the flow path of the premixed gas. Therefore, it is necessary to prevent the intrusion of dew condensation water and the like, and it is necessary to perform more reliable coating.

Further, in the above combustion device,
The wind box is equipped with an inspection window for inspection and repair of the flame holder and electrode parts, and an inspection lid for closing the inspection window. The size of the inspection window is usually large enough to cover the flame holder and the attachment part of the electrode component for convenience of inspection.

Therefore, in the conventional wiring of electrode parts, a terminal insertion hole is formed in the inspection lid provided in the wind box, and the terminal portion at the rear end of the electrode part is projected from the insertion hole, and wiring is performed in this terminal portion. The wiring is connected outside the wind box so that the terminal portion and the insertion hole are closed by an appropriate sealing material so that there is no connection portion such as wiring inside the wind box.

[0007]

In the combustion apparatus having the above-mentioned structure, in which the terminal end is exposed from the inspection cover as described above, the terminal end is connected as described above. In addition to the above parts, a member for sealing between the terminal and the insertion hole is required, which increases the number of parts.

Further, in the electrode component having the above-mentioned structure, the electrode is arranged at one end of the insulator portion and the terminal is arranged at the other end, and when the electrode component is fixed so that the electrode is at a predetermined position, the terminal is formed. Since the position of is fixed, there is little freedom in the mounting position.

Further, since the terminal side of the electrode part is projected from the wind box, an electrode part having an insulator length corresponding to the size of the wind box is required, and the wind box itself also has the size and shape of the electrode part. Subject to the restrictions.

Further, in order to absorb the mounting dimensional error, it is necessary to form the mounting side, that is, the terminal insertion hole of the inspection lid, to be relatively large. Therefore, a larger packing material and sealing material are required, It means higher cost and lower hermeticity.

Further, with the above-mentioned structure, when the inspection lid is detached when the combustion device and the electrode parts are inspected, it is necessary to detach the wiring, the packing material, and the sealing material. This has led to an increase in man-hours. At the same time, when closing the inspection lid, it is necessary to align the terminals with the insertion holes.
Also in this respect, the work is troublesome.

Further, the packing material and the sealing material as described above are for sealing the premixed air inside the wind box, and as described above, the opening and closing of the sealing portion is repeated every time the inspection lid is opened and closed. That causes a problem in sealing property.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is an insulating insulator member, and an electrode member having a tip protruding from the insulator member.
A bendable conductive member electrically connected to the other end of the electrode member, and a bendable insulating protective tube covering the conductive member and the connecting portion between the conductive member and the insulator member. It is an electrode part characterized by the above.

[0014]

The electrode part according to the present invention can be easily mounted on the equipment to which it is applied, can be easily electrically connected, and the number of parts for wiring can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electrode component according to the present invention will be described below with reference to FIGS. The electrode component (10) includes an insulator member (11) made of an insulating material and a conductive electrode member (1).
2), which is composed of a conductive member (13) connected to the electrode member (12) and electrically connected to another device, and a protective tube (14) covering the conductive member (13).

The insulator member (11) is formed by, for example, molding ceramic powder or the like and sintering it, and has an insertion hole (15) for the electrode member (12) formed in the axial direction. This insertion hole
(15) One end of the conductive member (1
3), as a first recess space (16) for mounting the protection tube (14). The other end is also formed to have a large diameter to increase the distance to the boundary surface between the insulator member (11) which is an insulating member and the electrode member (12) which is a conductive member during use to prevent leakage. The second concave space (17) is provided for this purpose.

The shape, size, and material of the electrode member (12) are appropriately selected according to the use and environment of use of the electrode component, but the conductive member (13) connection side is a sharp portion as described later. . This electrode member (12) has a through hole (1) for the insulator member (11).
5) and insert the sharp part of the electrode member (12) into the first recess space (16).
It is fixed in a state of slightly protruding from. This electrode member
The (12) is fixed to the insulator member (11) at the time of molding the insulator member (11), or after molding, from the second recessed space (17) of the insulator member (11) to the insertion hole (15). It is performed by filling a welding material such as ceramic powder or glass and heating again.

The conductive member (13) and the protective tube (14) are provided in the first recessed space (16) of the insulator member (11) substantially coaxially. The conductive member (13) and the electrode member (12) are provided. ) And electrical / mechanical connection are as follows. That is, the conductive member (1
3) is provided in a state where the sharp part of the electrode member (12) is pierced, and fixing at this position is performed by sealing in the gap between the protective tube (14) and the insulator member (11) in the first recess space (16). By filling the material, the insulator member (11) and the protective tube (14) are fixed. In addition, these conductive members (1
3), the protective tube (14), the shape, dimensions and materials are appropriately selected according to the application of the electrode component and the use environment, but in particular,
The length is determined according to the positional relationship of the wiring to be connected.

Regarding the method of fixing the electrode component (10) itself to the device, a well-known means, for example, by covering the outer periphery of the insulator member (11) with a metallic cap, the tip of the insulator member (11) Form a screw part on the small diameter part and screw it directly into the mounting hole drilled in the equipment using it, or after inserting it into the mounting hole, screw a nut etc. into this small diameter part and attach it, or Mount with a member that sandwiches the diameter part with the mounting position.

On the other hand, electrical wiring is provided by providing appropriate terminals and terminals at the tip of the conductive member (13),
You can easily connect using this terminal. At this time, since the conductive member (13) and the protective tube (14) have flexibility, the fixing position can be appropriately determined, and even if the mounting position is displaced due to processing accuracy, this dimensional difference Can be absorbed.

In this way, the side for wiring with other equipment is
By using a flexible conductive member directly from the electrode component, the terminal portion can be easily attached and the dimensional difference can be absorbed. In addition, the labor for mounting and dismounting becomes simple. Furthermore, since the electrode member is provided with a conductive member for connecting to another device, it is not necessary to form such a connecting portion as a separate component as in the conventional case, and the cost can be reduced.

In this embodiment, the electrode member and the conductive member are connected by butting, but the two members may be connected by a method other than such butting.
For example, a structure in which an electrode member and a conductive member are welded, a conductive tube including the welded portion is covered with a protective tube as a coating, and a gap between the protective tube and the insulator member is filled with an appropriate sealing material, or an electrode member A screw portion is formed at the rear end portion, and a conductive member formed in a coil spring shape is screwed into the screw portion, and thereafter, to a conductive member including the screwed portion,
It may have a structure in which a protective tube is covered as a coating and a gap between the protective tube and the insulator member is filled with an appropriate sealing material.

In the following, when the above-mentioned electrode parts are used as an ignition electrode (spark rod) and a flame detection electrode (frame rod) of a premixed gas burner,
This will be described with reference to FIGS.

When the electrode component is used as an ignition electrode or a flame detection electrode of a combustion device, the electrode member is made of a material having high heat resistance and corrosion resistance such as S-wire (trade name), and the conductive member (13 Similarly, the coating of) should be made using a material with high heat resistance and corrosion resistance. Note that, for convenience of description, the conductive member (13) and the protective tube (14) are collectively referred to as a coated conductive wire (18) below.

FIGS. 3 to 5 show the main parts of the premixing type gas burner. The premixing type gas burner has a substantially rectangular cross-sectional shape and is provided on the downstream side (upper side in FIGS. 1 and 2) of the wind box 40. The flame stabilizer (41) having a large number of minute holes for ejecting air-fuel mixture is attached. On the upstream side of the flame holder (41) in the wind box (40), the electrode parts having the above-mentioned configuration are arranged as a spark rod (42) and a frame rod (43). Also, in order to check the combustion device,
An inspection window (46) having a size covering the (41), the spark rod (42) and the frame rod (43) is formed, and the inspection window (46) is covered by an inspection lid (47).

In the spark rod (42), the protruding portion of the electrode member (12) from the insulator member (11) is formed in a substantially U shape, and the electrode member in the frame rod (43) is formed.
The protruding portion of the insulator member (11) (12) is formed in a substantially L shape. In the spark rod (42), the small diameter portion of the insulator member (11) is inserted into the mounting hole (44) formed in the wind box (40), and the tip of the U-shaped electrode member is the surface of the flame holder. It is fixed so that it is in a close state to. When fixing this, use the large diameter part of the insulator member (11) to attach the bracket (50).
Screw through.

Coated wire (18) extending from the spark rod
Is an extraction hole (45) formed on the side of the wind box (40).
Taken out of. For fixing and sealing the lead-out hole (45) and the coated conductor (18), the following fixing parts are used. That is, as shown in FIG. 5, the fixing component (60) includes a main body (62) having an insertion hole (61) inside, a tapered concave portion (63) formed at one end thereof, and a concave portion (63). Packing member (65) housed in (63) and having a tapered cone shape having an insertion hole (64) in the center, and tightening for pressing the packing member (65) into the tapered recess (63) It is composed of a member (66).

In mounting, the coated wire (18) is inserted through the fastening member (66) of the fixed component (60), the packing member (65), and the insertion hole (61) of the main body (62), and the main body ( By tightening the tightening member (66) against the 62), the packing member (65) and the recess
Using the taper with (63), the covered wire (18) and the fixed part
Airtight and fix with (60). Then, after this, the fixing component (60) is fixed to the extraction hole (45) of the side plate of the wind box (40) through an appropriate packing or the like, so that the covered conductor (1
8) Bent it in a substantially arc shape and fix it airtightly.
Then, the tip of the conductive member (13) is connected to the coated conductor (18) with an ignition device such as an ignition transformer.

One frame rod (43) is made up of an insulator member (1
Mounting hole (4) with the small diameter part of 1) formed in the wind box (40)
4) and fix it so that the tip of the L-shaped electrode member (12) is at a predetermined distance from the surface of the flame holder (41) and is in a substantially parallel state. To do. Regarding the fixing procedure of this frame rod (43) and the fixing method of the conductive member,
Since it is similar to the above spark rod (42), detailed description thereof will be omitted.

With the above structure, the structure for electrical connection is simplified, and the fixed position thereof is not affected by the mounting positions of the spark rod (42) and the frame rod (43). It can be set freely.

Further, since the terminal mounting portion is the covered wire (18) and is flexible, there is a high degree of freedom in the mounting positions of the spark rod (42), the frame rod (43) and the terminal mounting position. The shape of the box (40) is simplified. Further, the inspection window (46) and the lid (47) correspond to positions where the spark rod (42) and the frame rod (43) are covered, but the covered conductor (18) is pulled out from the side plate of the wind box (40). Therefore, when the inspection lid (47) is opened and closed at the time of inspection, it is not necessary to remove and install the covered wire (18).
Also, since the covered wire (18) can be pulled out from the side plate of the wind box (40), check the sealing condition before checking the cover (47).
It suffices to close, and the conventional alignment is unnecessary, and workability is high in this respect as well.

In the above embodiments, the case where the electrode parts are used as the ignition electrode and the flame detection electrode of the combustion device has been described, but the electrode parts according to the present invention are
In addition to the applications as described above, it can also be used for applications such as a water level detecting electrode in a water level control device.

[0033]

Since the electrode part according to the present invention integrally comprises a conductive member for connecting to other equipment, it is necessary to form such a connecting part as a separate part as in the prior art. Cost can be reduced. As described above, the flexible wiring conductive member integrally formed with the electrode component is used on the side for wiring with another device, thereby facilitating the electrical wiring. Furthermore, there is a high degree of freedom in setting the mounting position of the electrode parts, the drawing position of the wiring (conductive member), etc. Also, since the dimensional error and the mounting error can be absorbed, the placement of the electrode parts can be freely performed. Its mounting and mounting is easy. In addition, since the number of parts for wiring can be reduced as described above, electrical connection to other electric devices is also easy, and labor for attachment and detachment is also easy.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an electrode component according to the present invention.

2 is an explanatory diagram for explaining a state before assembly of the electrode component shown in FIG. 1. FIG.

FIG. 3 is a vertical sectional side view showing an embodiment in which an electrode component according to the present invention is applied to a combustion device.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is an enlarged view of a fixed portion of the covered conductive wire in FIGS.

[Explanation of symbols]

 (10) Electrode parts (11) Insulator member (12) Electrode member (13) Conductive member (14) Protective tube

Claims (1)

[Claims] 1. An insulating insulator member (11) and the insulator member.
An electrode member (12) having a tip protruding from (11), and a bendable conductive member electrically connected to the other end of the electrode member (12).
(13) and the conductive member (13), and a bendable insulating protective tube (14) for covering the connecting portion between the conductive member (13) and the insulator member (11). And electrode parts.