JPS6237164Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms electrodes on both the front and back sides on 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.

Conventionally, this type of device is an oxygen concentration battery device in which the device substrate is made of zirconia or other oxygen ion conductive solid electrolyte, and an electromotive force is generated according to the difference in atmospheric oxygen concentration between the front and back electrodes. Alternatively, a variable resistance element is known in which the element substrate is made of titania or other metal oxide semiconductor to generate a resistance change depending on the difference in atmospheric oxygen concentration between electrodes.

The applicant of the present application has previously prepared an element of this type, for example, as shown in FIG. 1, by forming at least one slit b on the tip side of the element substrate a;
Electrodes d and d are formed on both the front and back sides of one side c and the other side c separated by the slit b, respectively, so that the one side c and the other side c are independent combustion detection elements. Thus, one element can function as 2
We have proposed a device that can achieve the same operation using multiple elements.

In this case, the element is used by connecting one side c and the other side c to each other in parallel or in series, but this connection is made by a lead soldered to a terminal end e extending from each electrode d. This is generally done using a wire f, but this method requires soldering at a total of four connection points e for each electrode c, which is inconvenient in that the work is time-consuming.

The purpose of the present invention is to provide a combustion detection element that eliminates such inconveniences, and includes forming at least one slit 2 on the tip side of an element substrate 1 made of zirconia or other material.
Electrodes 4, 4 on both the front and back sides are formed on one side piece 3 and the other side piece 3, which are separated by In the element substrate 1, the one side piece 3 and the other side piece 3 are arranged in parallel or in parallel with each other. It is formed by forming conductive paths 5 connected in series.

FIG. 2 shows an embodiment in which a conductive path 5 is formed on the element substrate 1 to connect one side piece 3 and the other side piece 3 in parallel. A pair of lead-out parts 6, 6 connected to each electrode 4, 4 on the same surface
and a connecting portion 7 at the tail end extending over the drawn-out portions 6, 6, and a pair of connecting portions 8 on the front and back connected to each of the connecting portions 7, 7 on the front and back sides of the substrate 1. , 8 was formed. In addition, when forming the electrode 4, these lead-out portions 6, connection portions 7, and connection portions 8 are formed by applying a conductive material of the same type or a different type to the electrode material to the substrate 1 by means such as coating, printing, vapor deposition, etc. to form.

For example, as shown in FIGS. 3 and 4, lead wires 9, 9 for output extraction are soldered to the connection parts 8, 8 on the front and back sides, and the electrodes 4 on one side of the side pieces 3, 3 are soldered. , 4 are installed and used so as to face each other with a gap in front of the burner 10.

According to this, when incomplete combustion occurs in the burner 10, the side pieces 3, 3 are stretched forward from the state shown by the solid line in FIG.
The electrodes 4, 4 on one side are exposed and a difference in oxygen concentration occurs between the electrodes 4, 4 on the other side exposed to the outside air, and an electrical A change is generated, the same output as when two elements are connected in parallel is given to a control circuit (not shown) via lead wires 9, 9, and a safety valve (not shown) interposed in the gas supply path is closed. .

FIG. 5 shows an embodiment in which a conductive path 5 is formed on the element substrate 1 to connect one side piece 3 and the other side piece 3 in series. A pair of front and back lead-out portions 6, 6 extending from the electrode 4 and the electrode 4 on the back surface of the other side piece 4 toward the tail end of the substrate 1.
and a connecting portion 7 for both the drawer portions 6, 6 attached to the tail end surface of the substrate 1 as shown in FIG. 6, but the present invention is not limited to this, and for example as shown in FIG. Each of the lead-out parts 6, 6 may be guided to the front and back sides of the root of the slit 2, and a connecting part 7 for connecting both the lead-out parts 6, 6 may be formed on the inner surface of the root, and further, as shown in FIG. A through hole 11 is formed in the through hole 1.
The drawer portions 6, 6 leading to the front and back sides of the through hole 11 may be connected to each other by a connecting portion 7 that is attached to the inner circumferential surface of the through hole 11. In this case, the element substrate 1 includes the electrode 4 on the back surface of the one side piece 3 on which the lead-out portions 6, 6 are not formed;
The electrode 4 on the surface of the other side piece 3 and each extension part 12, 12
Connecting portions 8, 8 are formed on the front and back sides, and lead wires 9, 9 for outputting output are soldered to these connecting portions 8, 8. According to this element, an output similar to that obtained when two elements are connected in series can be obtained between the lead wires 9, 9.

FIG. 9 shows a device substrate 2 with an element substrate 1 formed on its tip side.
Divide into 3 pieces 3, 3, 3 with slits 2, 2,
An embodiment is shown in which these three pieces 3, 3, 3 are connected to each other in series via a conductive path 5, and the conductive path 5 is connected to the same draw-out portions 6, 6 as shown in FIG. The conductive path 5 consisting of the section 7 is configured by preparing two sets in which one side piece 3 and the middle piece 3 and the middle piece 3 and the other side piece 3 are connected in series. .

The lead wires 9, 9 for taking out the output are soldered to the connection parts 8, 8 on the front and back sides formed in the same manner as in the above embodiment, and according to this, the same result as when three elements are connected in series An output is generated between leads 9,9.

In this way, according to the present invention, on the element substrate 1,
Since the conductive path 5 that connects the one side piece 3 and the other side piece 3 separated by the slit 2 in parallel or in series is formed, a lead wire for connecting each piece 3 is separately connected to the element substrate 1. There is no need to connect a pair of lead wires for output output to the board 1.
Only two connections are required, which has the effect of simplifying the work.

[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, and Figs. 3 and 4 are front views and cutaways showing the state of use thereof. 5 is a front view of the second embodiment of the combustion detection element according to the present invention, FIG. 6 is an end view of its tail end, and FIG. 7 is a front view of the third embodiment of the combustion detection element according to the present invention. The figure is a front view of a fourth embodiment of the combustion detection element according to the present invention, and FIG. 9 is a front view of a fifth embodiment of the combustion detection element according to the present invention. 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 one side piece 3 and the other side piece 3 separated by the slit 2, respectively. The one side piece 3 and the other side piece 3 function as a single combustion detection element that generates an electrical change according to the difference in oxygen concentration between the electrodes 4, 4 on both the front and back surfaces, respectively. A combustion sensing element comprising a conductive path 5 formed on the element substrate 1 to connect the one side piece 3 and the other side piece 3 in parallel or in series.