JPH025409Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms electrodes on both the front and back sides of a zirconia or other element substrate, and detects incomplete combustion in the burner by electrical changes depending on the difference in atmospheric oxygen concentration between the electrodes on both sides. The present invention relates to a combustion detection element as described above.

Conventional devices of this type include oxygen concentration battery devices or device substrates that are constructed of zirconia or other ion-conducting solid electrolytes so that an electromotive force is generated on both the front and back surfaces according to the difference in atmospheric oxygen concentration between the electrodes. A variable resistance element is known in which a resistance change element is made of titania or other metal oxide semiconductor to generate a resistance change according to a difference in atmospheric oxygen concentration between electrodes. The applicant of the present application previously created this kind of element by forming at least one slit b on the tip side of the element substrate a, as shown in FIG. 1, and each piece c separated by the slit b. Electrodes d and d are formed on both the front and back sides of the piece so that each piece c functions as an independent combustion detection element, and thus the same operation can be obtained by using two elements in one element. I suggested something that I could use. In this case, the element is used by connecting each piece c in parallel or in series, but
This connection is generally made by using a lead wire f that is soldered to the connection point e at the tail end extending from each electrode d. This entails the inconvenience of requiring additional work, which is time-consuming.

In addition, as an earlier application of the present invention, a method in which electrodes on the surface of the element substrate are connected in series via through holes has been proposed in Japanese Patent Application No. 54-157823 (Japanese Unexamined Patent Publication No. 56-79951). However, the problem is that the connection at the through-hole part is complicated.

The purpose of the present invention is to provide a combustion detection element that eliminates such inconveniences, and in which at least one slit 2 is formed on the tip side of an element substrate 1 made of zirconia or other material. Electrodes 4, 4 are formed on both the front and back surfaces of each piece 3 divided by the 3, and each piece 3 generates an electrical change according to the oxygen concentration difference between the electrodes 4, 4 on both the front and back surfaces, respectively. In a device configured to function as an element, an electrode 4 on the front surface of each piece 3 and an electrode 4 on the back side of each piece 3 adjacent thereto are connected to a conductive path spanning both the front and back surfaces of the substrate 1 and the tail end surface. 5, and the conductive path 5 is formed on the substrate 1. The one shown in FIGS. 2 and 3 has one slit 2 on the tip side of the substrate 1.
A front and back surface extending from the electrode 4 on the front surface of the one side piece 3 and the electrode 4 on the back surface of the other side piece 3 adjacent thereto toward the tail end of the substrate 1 is provided. A conductive path 5 was constituted by a pair of lead-out parts 6, 6 and a connecting part 7 of both lead-out parts 6, 6 attached to the tail end as shown in FIG. In this case, the element substrate 1 includes:
Connecting portions 8, 8 on the front and back are connected to the electrode 4 on the back surface of the piece 3 on one side that does not form the lead-out portions 6, 6, and the electrode 4 on the surface of the piece 3 on the other side via the respective extension portions 12, 12. is formed, and lead wires 9, 9 for output extraction are soldered to this. These lead-out portions 6, connection portions 7, and connection portions 8 are formed by applying a conductive material of the same type or different type as the electrode material to the substrate 1 by coating, printing, vapor deposition, etc. when forming the electrodes 4. .

For example, as shown in FIG. 5, this element has lead wires 9, 9 for output output soldered to the connection parts 8, 8 on the front and back sides, and electrodes 4, 9 on one side of the pieces 3, 3 on both sides.
4 are installed in front of the burner 10 so as to face each other with a gap between them.

According to this, when incomplete combustion occurs in the burner 10, the electrodes 4, 4 on one side of the pieces 3, 3 on both sides are exposed to the combustion flame expanding forward from the burner 10,
A difference in oxygen concentration occurs between the electrodes 4, 4 on the other side exposed to the outside air, and an electrical change occurs in each piece 3, 3 according to the difference in oxygen concentration, connecting the two elements in series. An output similar to that at that time is given to a control circuit (not shown) via the lead wires 9, 9, and a safety valve (not shown) interposed in the gas supply path is closed.

The embodiment shown in FIG.
were connected in series via a conductive path 5. That is, the electrode 4 on the front surface of the one side piece 3 and the electrode 4 on the back side of the middle piece 3.
are connected by a conductive path 5, and the electrode 4 on the front surface of the middle piece 3 and the electrode 4 on the back surface of the other side 3 are connected by the conductive path 5, and the lead wires 9, 9 for output extraction are connected as described above. As in the example, the connection part 8 provided on the back side of one piece 3 and the connection part 8 provided on the surface of the other side piece 3 are each soldered, and according to this, three elements are connected in series. Output is obtained on the lead wires 9, 9 in the same way as in the case of

In this way, the present invention provides electrodes 4 on the surface of each piece 3.
and the electrode 4 on the back surface of each adjacent piece 3 are connected by a conductive path 5 spanning both the front and back surfaces of the substrate 1 and the tail end surface, and the conductive path 5 is adhered to the substrate 1.
This has the effect that the formation is simpler than that in which a conductive path is formed using a through hole.

[Brief explanation of the drawing]

Fig. 1 is a front view of the combustion detection element according to the previous proposal, Fig. 2 is a front view of the first embodiment of the proposed combustion detection element, Fig. 3 is an end view of its tail end, and Fig. 4 is a front view of the combustion detection element according to the proposal. A front view showing the embodiment, Figure 5 is similar to Figures 2 and 3.
It is a front view showing the state of use of the figure. 1...Element substrate, 2...Slit, 3...Slice,
4... Electrode, 5... Conductive path.

Claims (1)

[Scope of utility model registration request] At least one slit 2 is formed on the tip side of a zirconia or other element substrate 1, and electrodes 4, 4 are formed on both the front and back surfaces of each piece 3 separated by the slit 2. are electrodes 4 and 4 on both the front and back surfaces, respectively.
An electrode 4 on the front surface of each piece 3 and an electrode 4 on the back side of each piece 3 adjacent thereto function as a single combustion detection element that generates an electrical change according to the difference in oxygen concentration between the two pieces. are connected by a conductive path 5 extending over both the front and back surfaces and the tail end surface of the substrate 1, and the conductive path 5 is formed on the substrate 1.