JPH02176312A - Gas pilot flame device - Google Patents

Abstract

PURPOSE:To miniaturize the device and reduce the cost by conjugating an errected body wherein P-type element, etc., are conjugated to the high temperature side of a gas discharge tube wherein P-type semiconductor thermoelements in the shape of half-tube, etc., are conjugated interposing an insulator, and forming a tubular thermo- couple on the low temperature side. CONSTITUTION:A pilot flame sensor element 1 is in the shape of tube as a whole, and consists of a P-type semiconductor thermoelement 11 in the shape of half-tube, likewise an N-type semiconductor thermoelement 12, a semiconductor thermoelement 13 wherein the P-type, N-type or both of them are conjugated and errected in the high temperature part that is an end on one side of this tubular shape, and lead terminals 31, 32 conductively conjugated to the low temperature part that is an end on other side. The element 11 consists of FeSi2 containing manganese, boron elements, and the element 12 consists of FeSi2 containing cobalt, boron. The elements 11, 12 are conjugated with an alumina adhesive 2. The element 13 is divided into two parts at the middle A, and conductively conjugated to the element 11 and the element 12 respectively with brazing, etc., and an element 1 is mounted at the gas discharge part of a pilot flame device. The lead terminals 31, 32 are conjugated by brazing to the low temperature part.

Description

[Detailed Description of the Invention] (Industrial Application Field) As is well known, a thermocouple is a circuit in which two different metals or semiconductors are connected at one end and the other end to form a closed circuit. If there is a temperature difference between the two junctions on the other end side, an electromotive force is generated in this circuit, which is the so-called Seebeck effect.

The present invention relates to an improvement of a thermocouple based on this effect, and also relates to a starter device having a novel extinguishing detection mechanism using the improved thermocouple.

(Prior Art) A pilot device having a burnout detection mechanism used in a conventional gas water heater or the like will be explained with reference to FIG.

In FIG. 5, 5 is a starter device, 6 is a starter sensor incorporating a thermocouple, and 7 is an ignition device. First, when igniting a pilot flame, the gas cock of the pilot device 5 is opened and at the same time the ignition device 7 ignites the gas to obtain a pilot flame. When the starter is ignited, the tip of the starter sensor 6 rapidly ripens and generates a thermoelectromotive force, which keeps the electromagnetic valve 51 in the gas supply mechanism of the starter device open to maintain the gas supply. And this spark ignition mistake,
Alternatively, in the event of an unexpected situation such as the pilot flame extinguishing due to wind, etc., the pilot flame sensor will not be heated or will be rapidly cooled down, causing no thermoelectromotive force to be generated or disappearing. The solenoid valve 51 is closed and the gas supply is stopped.

(Problem to be solved by the invention) The thermoelectromotive force of a thermocouple is basically determined by the constituent materials, but it is also a function of the temperature difference, and the greater the temperature difference, the greater the thermoelectromotive force. is generally known. However, in the extinguishing detection mechanism used in the pilot flame device, the high-temperature part heated by the pilot flame and the low-temperature part from which the thermoelectromotive force is derived are relatively close to each other, making it difficult to obtain a sufficient temperature difference, and therefore having the disadvantage that the D electromotive force is small. Was. If only a small thermoelectromotive force can be obtained, the structure of the solenoid valve drive section and coil section must be particularly complex and sophisticated in order to ensure the reliability of the operation of the solenoid valve shown in Figure 4. This resulted in high costs. Simplifying the drive unit etc. can be achieved by increasing the generated voltage, but in order to increase the voltage, it is sufficient to increase the temperature difference ΔT between the high temperature part and the low temperature part, so it is better to increase the overall length (i.e. (Increase the distance between the high temperature and low temperature parts.) However, this method not only makes the thermal lightning pair larger, but also increases the electrical resistance, which reduces the amount of power that can be extracted. Therefore, as can be easily understood from the above, if the thermocouple is made smaller, the temperature difference ΔT cannot be maintained and the thermoelectromotive force also decreases, so miniaturization and the magnitude of the thermoelectromotive force are in a contradictory relationship. there were. Furthermore, it is difficult to provide a new cooling device in the low-temperature portion of the thermocouple due to structural or cost considerations.

Also, as can be understood from Figure 4, since the starter sensor or ignition device is concentrated near the starter of the starter device,
The structure is unavoidably complicated, leading to increased costs and hindering miniaturization of the safety mechanism.

The present invention was made to solve the above drawbacks, and
It is an object of the present invention to provide a starter device having an extinguishing safety mechanism that can be downsized and cost-effective.

(Means for Solving the Problems) In order to achieve the above object, the gas starter device according to the present invention includes a semi-tubular P-type semiconductor thermoelectric element, an N-type semiconductor thermoelectric element, or two of the conductors, which are separated by an insulating material. A pipe is connected through the pipe to lead out the gas, and one end of this pipe, which is the high temperature side, has a P type.

An N-type conductor, or a construction body made by joining two of them, is constructed and joined, and a tubular thermocouple with a lead wire connected to the gas supply control means is attached to the other end, which is the low temperature side, at the gas discharge part. It was made into a formed structure.

Further, a heat dissipation metal plate may be electrically bonded to the vicinity of the other end of the tubular thermocouple made of two of the P type, N type, and conductor.

(Function) Since the gas starter device according to the present invention has a tip portion from which gas is discharged made up of a tubular thermocouple, the gas flows through this tube, so that the parts other than the flame port are cooled by the gas flow. Therefore, the temperature difference between the high temperature part and the low temperature part of the thermocouple becomes large. Alternatively, the dimension between the high temperature part and the low temperature part can be reduced even with the same thermoelectromotive force as in the past. (In other words, it can be made smaller.) When the pilot flame goes out, the high-temperature section is forcibly cooled by the discharged gas, so the temperature difference between the high-temperature section and the low-temperature section rapidly decreases.

In addition, since the starter sensor is built into the starter device,
Structural complexity around the starter device is eliminated.

Furthermore, heat transmitted from the high-temperature section can be dissipated by electrically bonding metal plates for heat dissipation to the P-type and N-type near the other end (low-temperature section) of the tubular thermocouple.

(Example) Embodiments according to the present invention will be described with reference to the drawings.

First Embodiment A first embodiment will be described with reference to a perspective view of a thermocouple in FIG. 1, a plan view of a thermocouple in FIG. 2, and a schematic diagram of a starter device in FIG. It should be noted that the description of this embodiment relates to claim 1. Further, the same parts as in the conventional example are given the same numbers.

Pilot spark sensor element 1 forming the gas discharge part of the pilot device
is a half-tubular P-type semiconductor thermoelectric element (hereinafter referred to as P-type) 11, an N-type semiconductor thermoelectric element (hereinafter referred to as N-type) 12, and is installed in the high-temperature part at one end of this tubular shape. It consists of a semiconductor thermoelectric element 13 that is either P type, N type, or a combination of both, and lead terminals 31 and 32 that are conductively connected to the other end, which is the low temperature part.

The P type 11 is Fe5j2 containing Mn (manganese) and B (boron) elements, and the N type is FeSi2 containing Co (cobal) and B elements, respectively. These P-type 11. Each of the N-types 12 is formed into a half-tube shape and joined with an alumina adhesive 2 to form a tube shape.

In this embodiment, the adhesive 2 is Aron Ceramic No. D (manufactured by Toagosei Kagaku Co., Ltd.). In the high-temperature part of this tube, a thermoelectric element (hereinafter referred to as a construction body) 13 installed in a semi-elliptical shape between a P-type 11 and an N-type 12 is divided into a P-type 131 and an N-type 132 at the intermediate point A. , P type 1
31 is a tube-shaped P type 11, and N type 132 is a tube-shaped N type 12.
They are each electrically conductively joined by brazing or the like. In addition, lead terminal 3
1.32 is soldered to the cold part.

The tubular thermocouple 1 constructed in this manner is installed at the gas discharge portion of the starter device. FIG. 3 shows an example of the configuration of the pilot device based on this embodiment. When the pilot ignites, the construction body 13 that becomes the flame mouth is heated, so a thermoelectromotive force is generated, and based on this electromotive force, gas is The solenoid valve 51 in the supply mechanism continues to be opened to continue supplying gas. When the pilot flame is extinguished, no electromotive force is generated, the solenoid valve is closed, and the gas supply is stopped.

Second Embodiment A second embodiment of the present invention will be described with reference to a perspective view of a thermocouple in FIG. Note that the description of this embodiment relates to claim 2.

The spark sensor element according to this embodiment has a tubular shape as a whole, and includes a half-tubular P-type 14, an N-type 15 similar to the half-tubular shape, a construction body 16 installed in the high temperature part of this tubular shape, and a P-type and an N-type each. a half-tube-formed hot metal plate 41, 42 electrically connected to the low-temperature part of the
It consists of lead terminals 33 and 34 connected to this metal plate.

In this example, the P type 14 is cr's1□, and the N type 1
5 is CoSi. These semi-tubular P type.

N type is Aron Ceramic number D (manufactured by Toagosei Kagaku Co., Ltd.)
They are joined together with an alumina adhesive 2 such as the like and made into a tube shape.

The construction body 16 formed in the high temperature part of this pipe is a semi-elliptical N
B in the figure is the PN junction.

On the other hand, in the low-temperature part, heat dissipating metal plates are electrically connected to the P type and N type respectively by soldering or the like. The material of this heat dissipation metal plate is, for example, nickel or nickel-plated copper.
P type14. It is set in a semi-tubular shape with a radius of curvature surrounding each of the N-types 15. In order to simplify the actual assembly, the P type 14 and the heat dissipating metal plate 41 are first conductively bonded.
After aligning the arc ends to the same plane (that is, aligning the P type 14 and the heat dissipating metal plate 410), conductively joining the N type 15 and the heat dissipating metal plate 42, and aligning the same,
It is preferable to form a stepped tube by insulatingly bonding the two with an alumina-based adhesive or agent. Note that the lead terminals 33 and 34 are joined to the heat dissipating metal plates 41 and 42, respectively. Then, this thermocouple may be used as a flame port of a starter device as shown in FIG.

In addition, the materials constituting the thermocouple are as follows. Not only the one shown in the second embodiment, but also any one suitable for high temperatures that can be used as a flame nozzle is suitable.

In addition, as for the construction body, a semi-elliptical one was shown as an example, but
It does not have to be limited to this shape.

For this structure, the height of the PN junction (height from the flame mouth) should be determined based on the gas discharge amount (proportional to flame strength and height) rather than its shape. good.

(Effects) According to this invention, since the tip of the gas starter device is composed of a tubular thermocouple, the temperature of the high-temperature part and the low-temperature part of the thermocouple is The difference becomes larger. For this reason, the thermoelectromotive force that can be taken out is significantly larger than that of the extinguishing detection mechanism shown in the 1x previous example, which improves the reliability of sensing as a spark sensor and simplifies the structure of the solenoid valve, which improves the overall Cost reduction can be achieved.

When the pilot flame is extinguished, the high-temperature section is forcibly cooled by the discharged gas, so a temperature difference between the high-temperature section and the low-temperature section is created, which quickly decreases, and the sensing response time of the pilot flame sensor can be shortened.

Additionally, since the starter sensor is integrated into the starter device, the number of parts (the starter sensor element) surrounding the starter device is reduced and the structure is simplified.

Furthermore, according to claim 2, since the heat dissipating metal plate is conductively bonded to the low temperature part of the tube type thermal lightning pair, the heat transmitted from the high temperature part (flame mouth part) can be dissipated, and the cooling capacity of the low temperature part is further increased. Thermoelectromotive force can be expanded. In addition, it is also possible to reduce the overall length of the thermal lightning pair without reducing the thermoelectromotive force.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are diagrams showing the first embodiment, and Figure 4 is a diagram showing the first embodiment.
The figure shows a second embodiment, and FIG. 5 is a schematic diagram showing a conventional fading detection mechanism. 11.14...P-type semiconductor thermoelectric power generating element 12゜15... N-type semiconductor thermoelectric generating element

Claims (2)

[Claims] (1) Two half-tube-shaped P-type semiconductor thermoelectric elements, N-type semiconductor thermoelectric elements, or conductors are joined together via an insulator to form a tube through which gas is discharged, and one side is the high-temperature side of the tube. A tubular thermoelectric tube has a P-type, N-type, conductor, or a construction body made of two of them joined at one end, and a lead wire connected to a gas supply control means at the other end, which is the low temperature side. A gas ignition device in which a pair is formed at the gas discharge part. (2) A gas pilot device according to claim 1, characterized in that a heat dissipating metal plate is conductively bonded to the vicinity of the other end of the tubular thermocouple made of two of P type, N type, and a conductor.