JPH10214556A - Thermocouple driven relay and safety gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the irregularity of on/off points for the electric connection of a thermocouple driven relay, in which electric connection between two electrodes is cut in accordance with a temperature condition detected by a thermocouple. SOLUTION: A thermocouple driven relay has a thermocouple and an electromagnet coil 3a connected in series, an electromagnet attracting member 4 freely attracted to or separated from an electromagnet core 3b, a conductor piece 5 attached to the electromagnet attracting member 4, an energizing means 6 to energize the electromagnet attracting member 4 into a separated condition and an attracting means 7 to make the electromagnet attracting member 4 into an attracted condition of two that the electromagnet attracting member 4 can be held in the attracted condition only by electromagnetic force generated by an electromagnet. The attracted or separated condition of the electromagnet attracting member 4 allows the relative position of the conductor armature 5 to two electrodes 2a, 2b to be set corresponding to the on/off condition of two electrodes 2a, 2b. At least, the electromagnet coil 3a, the electromagnet core 3b, the electromagnet attracting member 4, the conductor armature 5 and a contact point to the conductor armature 5 in two electrodes 2a, 2b are provided in a single casing 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple-driven relay in which electrical connection between two electrodes is interrupted in accordance with a temperature state detected by a thermocouple, and combustion using the thermocouple-driven relay. Related to safety devices for vessels.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional thermocouple-driven relay has a closed circuit in which a thermocouple 41 and an electromagnet coil 42 are connected in series, and a magnetic field of an electromagnet 43 formed by the electromagnet coil 42. An electromagnet attracting member 44 capable of reciprocating in response to the attraction force, an urging means 45 for urging the electromagnet attracting member 44 to a separated state with respect to the electromagnet, and an urging force of the urging means 45 by an external operation. A thermocouple circuit unit 40 provided with an attracting means 46 for attracting the electromagnet attracting member 44 to the electromagnet 43 in opposition, and a switch mechanism 47 provided separately from the thermocouple circuit unit 40;
An opening / closing mechanism 48 for mechanically interrupting the electrical conduction of the switch mechanism 47; and a mechanical linking member such as a leaf spring for mechanically interlocking the opening / closing operation of the opening / closing mechanism 48 with the reciprocating motion of the electromagnet attracting member 44. Some were provided with 49. For example, Japanese Patent Application Laid-Open No. 8-145365 discloses a similar technique.

[0003]

However, in the above-described conventional configuration, since the switch mechanism is formed separately from the thermocouple circuit section, it is necessary to ensure the switch operation of the switch mechanism. Positional accuracy of the thermocouple circuit and the switch mechanism is required. That is, a mechanism design that absorbs the dimensional tolerance of each part is required, and the structure becomes complicated,
This causes a rise in manufacturing costs. In addition, the variation in the on / off points of the switch mechanism becomes large due to the variation in the positional accuracy, and the switch does not turn on due to slight deviation of the dimensions, and conversely, the switch does not easily turn off. There was danger. When a conventional thermocouple-driven relay is used for a safety device such as a combustion device, special care must be taken.

The present invention has been made in view of such a point, and a purpose thereof is to provide a thermocouple-driven relay in which electrical connection between two electrodes is interrupted in accordance with a temperature state detected by a thermocouple. It is intended to provide a highly reliable thermocouple-driven relay applicable to safety devices such as combustion devices by suppressing variations in the on / off points of the electrical connection and reliably performing on / off operations. is there.

[0005]

[Means for Solving the Problems]

[Configuration] To achieve this object, a first characteristic configuration of a thermocouple-driven relay according to the present invention is an electromagnet coil connected in series with a thermocouple as described in claim 1 of the claims. An electromagnet core that forms an electromagnet together with the electromagnet coil, an electromagnet adsorption member capable of being attracted or separated from the electromagnet core, a conductor piece attached to the electromagnet adsorption member, and the electromagnet adsorption member. An urging means for urging the electromagnet core in a separated state, and an adsorbing means for adsorbing the electromagnet adsorbing member to the electromagnet core against an urging force of the urging means by an external operation; During the energization of, the suction state of the electromagnet suction member and the electromagnet core is configured to be maintained and maintained against the urging force of the urging means without using the suction means, The conductor piece and the two electrodes are so arranged that the attraction / separation state between the magnet attraction member and the electromagnet core corresponds to the on / off state or the off / on state of the electrical connection between the two electrodes, respectively. A relative positional relationship is set, and at least the electromagnet coil, the electromagnet core, the electromagnet attracting member, the conductor piece, and a contact portion of the two electrodes with the conductor piece in a single casing. In that it is prepared for.

The second characteristic configuration is, as described in claim 2 of the claims, an electromagnet coil connected in series with the thermocouple, an electromagnet core forming an electromagnet together with the electromagnet coil, and the electromagnet. An electromagnet attracting member capable of adsorbing or separating from the core, a conductor piece attached to the electromagnet attracting member, and an urging means for urging the electromagnet attracting member to the electromagnet core in a separated state. Wherein, during energization of the electromagnet coil, the electromagnet generates an electromagnetic force sufficient to bring the electromagnet attracting member and the electromagnet core into an attracting state against the urging force of the urging means, The conductor piece so that the attraction / separation state between the electromagnet attracting member and the electromagnet core corresponds to an on / off state or an off / on state of electrical connection between two electrodes, respectively. Set the relative positional relationship between the two electrodes, at least, the electromagnet coil, the electromagnet core, the electromagnet attracting member, the conductor piece, and the contact portion with the conductor piece of the two electrodes In that it is provided in a single casing.

A third feature of the present invention is that the casing has a closed structure in addition to the above first or second feature as described in claim 3 of the claims. .

A fourth feature of the present invention is that, in addition to the third feature of the present invention, an inert gas is sealed inside the casing, as described in claim 4 of the claims. .

According to a fifth aspect of the present invention, as described in claim 5 of the claims, in addition to the above-mentioned third or fourth aspect, a wall portion separating the inside and the outside of the casing is provided. Is formed of an elastic body.

[0010] To achieve this object, the safety device according to the present invention has a characteristic configuration (hereinafter referred to as a sixth characteristic configuration).
As described in claim 6 of the claims, the first and second electrodes are configured so that the two electrodes are electrically connected to each other when the electromagnet attracting member and the electromagnet core are attracted. Using a thermocouple-driven relay having the third, fourth, or fifth characteristic configuration, a thermocouple of the thermocouple-driven relay is installed near a combustion portion of the combustor, and between the two electrodes, A valve opening holding coil of an electromagnetic valve interposed in a fuel supply passage of the combustor, a positive characteristic thermistor for detecting an overheating state of a predetermined portion of the combustor, and a DC power supply were connected in series. On the point.

[Effects] The effects of the above features will be described below. According to the first characteristic configuration, the electromagnet attracting member and the electromagnet core are brought into contact with each other in an attracted state by the attracting means, and the electrical connection between the two electrodes is turned on or off in a first state, The thermocouple detects heat above a predetermined temperature, generates a thermoelectromotive force equal to or higher than a predetermined value, and generates a current that generates an electromagnetic force sufficient to maintain an attraction state between the electromagnet attracting member and the electromagnet core. And holding the electrical connection between the two electrodes in the first state, and when the thermocouple detects heat equal to or lower than the predetermined temperature, the attraction state of the electromagnet attracting member and the electromagnet core is set to the urging state. Return to the separated state without being able to withstand the urging force of the means, and the electrical connection between the two electrodes is changed to the first state.
A thermocouple-driven relay having the function of returning to the initial state opposite to the state is formed.

As described above, when the electrical connection between the two electrodes is intermittent, the conductive piece is attached to the electromagnet attracting member, so that the conductive piece is securely attached to the electromagnet attracting member. Operate following the transition between the separated states, and, since the conductor piece and the contact portion of the two electrodes constituting the switch mechanism are provided in the same casing as the electromagnet attracting member and the electromagnet, Variations in the positional accuracy of the relative positional relationship between these components among the thermocouple-driven relays can be extremely small, and variations in the ON / OFF points of the switch mechanism can be suppressed.

The switch mechanism is moved from the initial state to the first state.
In making the transition to the state, the thermoelectromotive force generated by the thermocouple is as weak as about several mV to 30 mV, so that the current that can be supplied to the electromagnet coil is small. It should be noted that the electromagnet attracting member cannot be attracted against the urging force of the urging means, and that the attracting means is separately provided.

When the thermocouple-driven relay is applied to a safety device such as a combustion device, the switch mechanism, which is necessary for a conventional thermocouple-driven relay when assembling a product incorporating the safety device, is required. It is not necessary to adjust the relative positional relationship between the electromagnetic mechanism and the electromagnet attracting member including the electromagnet attracting member, thereby improving the reliability of the safety device, and assembling the linking member between the switch mechanism and the electromagnet attracting member and adjusting the position thereof. This saves time and effort and reduces the cost of the final product.

According to the second characteristic configuration, the internal resistance of the electromagnet coil is kept low to increase the ampere turn,
In addition, the urging force of the urging means is suppressed to a necessary minimum, and during energization of the electromagnet coil, the electromagnet attracting member and the electromagnet core are brought into the attracting state against the urging force of the urging means. The electromagnetic force generated by the electromagnet is sufficient to allow the electromagnet coil to be attracted to the electromagnet core without relying on the attracting means by energizing the electromagnet coil. The same operational effects as those of the thermocouple-driven relay having the first characteristic configuration can be expected.

According to the third characteristic configuration, even when used in ordinary air, the electromagnet attracting member, the electromagnet core, the conductor piece, and the contact portion are prevented from being corroded by oxidation. A highly reliable and environmentally resistant thermocouple drive that is free from poor contact between the conductor piece and the contact portion due to these corrosions and can be used in an atmosphere other than in an extremely low moisture or oxygen atmosphere. A type relay can be provided.

Further, according to the fourth feature configuration, the corrosion resistance of the electromagnet attracting member, the electromagnet core, the conductor piece, and the contact portion in the second feature configuration can be positively improved. .

According to the fifth characteristic configuration, even in an environmental situation where the temperature changes drastically, the pressure change inside the casing due to the temperature change can be absorbed by the expansion and contraction of the elastic body. This can prevent a poor contact between the conductor piece and the contact portion due to the problem.

According to the sixth aspect, during the period from when the combustor starts combustion to when the combustion state is determined, the electromagnet attracting member is attached to the electromagnet core by the electromagnetic force of the attracting means or the electromagnet. After the suction state is held, and the combustion state is determined, the thermocouple energizes the electromagnet coil with a thermoelectromotive force generated by the heat of the combustion state to continuously maintain the suction state of the electromagnet suction member. Hold on to
A conduction state between the two electrodes of the thermocouple-driven relay can be maintained, and a current sufficient to hold the solenoid valve of the combustor open from the DC power supply to the valve opening holding coil. And the fuel supply to the combustor is continued. Furthermore, when the combustion of the combustor stops for some reason, the thermoelectromotive force of the thermocouple decreases or disappears, and a sufficient current can be supplied to the electromagnet coil to maintain the adsorption state of the electromagnet adsorption member. Instead, the two electrodes of the thermocouple-driven relay are in an open state, the current supply to the valve holding coil is cut off, and the solenoid valve is closed without being held open. Since the fuel supply to the burner is shut off, the fuel supply can be automatically and reliably shut off immediately after the abnormal stop of the combustion, and a safety device can be realized that can prevent the fuel from being ejected and diffused around the combustor. is there. In addition, since a highly reliable thermocouple-driven relay according to the first to fifth characteristic configurations is used, energization of the valve-opening holding coil can be reliably shut off, and depending on the structure of the combustor. By appropriately selecting the configuration of the thermocouple-driven relay from the first to fifth characteristic configurations, the degree of freedom in ensuring reliability and reducing costs is expanded. Note that, when the positive characteristic thermistor detects an overheating state of a predetermined portion of the combustor as a predetermined temperature as a threshold, the resistance value increases rapidly, and the amount of current supplied to the valve opening holding coil is limited, Since the solenoid valve is closed without being opened and the fuel supply to the combustor is shut off, a safety device that can prevent an abnormal overheating state from continuing indefinitely is the same as the safety device described above. It can be realized with a circuit.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a three-view drawing of an embodiment of a thermocouple-driven relay according to the present invention, and FIG. 2 is an equivalent circuit diagram thereof.

As shown in FIG. 1, a cylindrical magnet case 8a made of fluororesin, and the magnet case 8a
Magnet holder 8 fitted into one side opening of the magnet
b and a packing 8c made of fluororesin fitted in the center of the magnet holder 8b form a casing 8 of the thermocouple drive type relay 10.

A cylindrical electromagnet core 3b made of permalloy sandwiched by the magnet holder 8b is provided coaxially with the inside of the magnet case 8a, and an electromagnet made of polyester copper wire is provided on the outer and inner surfaces of the electromagnet core 3b. An electromagnet 3 is formed by winding a coil 3a. still,
The thermoelectromotive force generated by the thermocouple 1 is as weak as several mV to 30 mV, so that the internal resistance of the electromagnet coil is about 20 mΩ.
Thus, a large current value of several hundred mA is obtained to secure a necessary ampere-turn.

Both positive and negative electrodes 9a and 9b for electrically connecting to the thermocouple 1 are provided to protrude outside the magnet holder 8b. The negative electrode 9b is formed by projecting a copper magnet holder 8b outwardly, and an insulating holding portion 9c for holding the pin-shaped positive electrode 9a is provided inside the distal end of the negative electrode 9b. The positive electrode 9 is held between the packing 8c and the holding portion 9c.
a is attached on the axis extension of the electromagnet core 3b. The pin core of the positive electrode 9a is
b is connected to one end on the inside of the electromagnet coil 3a via a copper eyelet 8d fitted into the center of the electromagnet coil 3a, and one end on the outside of the electromagnet coil 3a is connected to the magnet holder 8b which is an electric conductor. , The negative electrode 9b
Is electrically connected to FIG. 1 shows the thermocouple 1.
Only the electrical connection between the positive and negative electrodes 9a and 9b is schematically shown.

Although the thermocouple 1 is not shown,
Constantan is provided at the center thereof, and Inconel is provided around the center thereof with an insulating material interposed therebetween, thereby forming a rod-like shape. At the tip, two kinds of metals are connected by welding to form a thermocouple contact. The two metals are connected to the positive and negative electrodes of a jack-type connector that can be electrically connected to the positive and negative electrodes 9a and 9b via lead wires, respectively. By connecting the positive and negative electrodes 9a and 9b to the jack type connector, a closed circuit is formed by the thermocouple 1 and the electromagnet coil 3a as shown in FIG.

An opening 8e is provided at the center of the wall of the magnet case 8a opposing the magnet holder 8b, and a cylindrical portion of the same material and the same material as the magnet case 8a is cut out of the wall outside the wall. Projected part 8
f is provided. Further, the thermocouple-driven relay 1
A mounting portion 8g provided with a through hole for mounting the entirety at a predetermined position with a screw or the like is integrally provided on an outer portion of the protrusion 8f. A copper rod 7a is mounted coaxially with the magnet case 8a so as to reciprocate in the axial direction thereof through the opening 8e. A permalloy donut-shaped electromagnet adsorbing member 4 adsorbing to the electromagnet core 3b is provided at one end of the rod 7a located inside the magnet case 8a on the electromagnet core 3b.
It is attached to face. On the other end side of the rod 7a, a cylindrical slide member 7b made of fluororesin is provided.
The outer peripheral portion is attached to the rod 7a while being in contact with the inner wall of the cylindrical projection 8f so as not to come off the rod 7a. In addition, a cushion spring 7d is provided between the rod 7a and the slide member 7b to absorb a press tolerance, and the slide member 7b is pressed against the other end of the rod 7a. The protrusion 7c provided on the outer peripheral portion of the slide member 7b is attached so as to fit into the cut of the protrusion 8f. The electromagnet attracting member 4 is provided between the slide member 7b around the rod 7a and the magnet case 8a inside the protrusion 8f.
Is attached to the electromagnet core 3b in a separated state. When the slide member 7b is pushed in the direction of the electromagnet core 3b, the rod 7a resists the urging force of the spring 6 by the repulsive force of the cushion spring 7d. Thus, the electromagnet attracting member 4 functions as the attracting means 7 for attracting the electromagnet core 3b.

The two electrodes 2a and 2b are provided on the cylindrical outer wall of the magnet case 8a.
The electrodes 2a, 2b are mounted symmetrically apart from each other with respect to the axis of a, and a part of the electrodes 2a, 2b penetrates through the wall to reach the inside of the magnet case 8a to form contacts 2c, 2d. . Further, on the inner side of the magnet case 8a of the rod 7a and before the electromagnet attracting member 4,
A conductor section 5 is attached. The electromagnet attracting member 4
Is in the separated state, the conductor piece 5 is
d, the rod 7a and the slide member 7b
Is pushed in the direction of the electromagnet core 3b, and the electromagnet adsorption member 4 moves in the same direction. Before the electromagnet adsorption member 4 is completely in contact with the electromagnet core 3b, the conductor piece 5 is connected to the contact 2c. 2d, when the electromagnet attracting member 4 comes into complete contact with the electromagnet core 3b, the conductor piece 5 is elastically deformed, and the contacts 2c, 2d
And the relative positions of the electromagnet core 3b, the electrodes 2a, 2b, the electromagnet attracting member 4, the conductor piece 5, the rod 7a, and the slide member 7b, and the rod The slide amount 7a is set.

Next, the operation of each part when the electrical connection between the two electrodes 2a and 2b is interrupted according to the temperature state detected by the thermocouple 1 will be described. The two electrodes 2a and 2b are brought into contact with the conductor piece 5 by the suction means 7, and the two electrodes 2a and 2b are brought into conduction. In this state, when a temperature difference occurs between the thermocouple contact 1a and the end of each thermocouple metal on the lead wire side, the thermocouple 1 generates a thermoelectromotive force, and the electromagnet coil 3a is energized. If the temperature difference is equal to or more than a predetermined value, the electromagnet 3 generates an electromagnetic force sufficient to attract the electromagnet attracting member 4 to the electromagnet core 3b against the urging force of the spring 6, and Even when the means 7 is opened, the conduction state between the two electrodes 2a and 2b is maintained. When the temperature difference becomes equal to or less than a predetermined value in a state where the attraction means 7 is opened and the conduction state between the two electrodes 2a and 2b is maintained, the electromagnetic force of the electromagnet 3 decreases and the spring 6 The conduction between the two electrodes 2a and 2b is interrupted without being able to withstand the urging force.

Next, a case where the thermocouple-driven relay according to the present invention is applied to a safety device for a gas stove, which is one of the combustors, will be described. FIG. 3 shows an electric circuit configuration of a gas stove including the safety device according to the present invention.

As shown in FIG. 3, the gas stove is configured so that fuel (gas) is supplied to a burner 22 through a fuel supply path 21 and the burner 22 burns the fuel. It is configured to heat an object to be heated (for example, a cooker such as a pan).
Further, there is provided an ignition operation means C for executing the ignition of the burner 22 and the stop of the combustion by manual operation.

The fuel supply path 21 has an open state in which the fuel supply path 21 is opened to enable fuel supply to the burner 22, and the fuel supply path 21 is shut off and the burner 22 An electromagnetic on-off valve 23 is provided, which can be switched to a closed state in which the supply of fuel to the valve is stopped and is urged to a closed state by urging means such as a spring (not shown). The electromagnetic opening / closing valve 23 is supplied with a current exceeding the minimum valve opening operation current value based on the manual operation of the ignition operation means C, and the electromagnetic opening / closing valve 23 resists the valve closing urging force based on the electromagnetic force. When the current exceeding the valve opening holding minimum current value flows through the valve opening operation coil 23a for opening the valve 23 and the electromagnetic opening force, the electromagnetic opening / closing valve 23 after the valve opening operation is opened based on the electromagnetic force. Maintain valve opening holding coil 23
b. After the electromagnetic on-off valve 23 is opened,
While a current exceeding the minimum valve opening holding current value is supplied to the valve opening holding coil 23b, the electromagnetic valve 23
Is maintained in an open state, and the fuel supply to the burner 22 is continuously maintained.

The gas stove serves as a combustion state detecting means for detecting whether or not the burner 22 is in a combustion state.
And a positive temperature coefficient thermistor 24 as overheating state detecting means for detecting that the temperature of the object to be heated by the burner 22 exceeds a set temperature, and the burner 22 is controlled by the thermocouple driven relay 10. A non-combustion state is detected, or the positive temperature coefficient thermistor 2
4, when the temperature of the object to be heated exceeds the set temperature, the electromagnetic on-off valve 23 is closed.

As shown in FIG. 3, each of the switch 2 of the thermocouple-driven relay 10, the positive temperature coefficient thermistor 24, the valve opening holding coil 23b, and the dry battery 25 as one embodiment of the DC power supply is They are connected in series to form a series circuit, and are turned on (hereinafter referred to as a conductive state, or
A switch that turns on (meaning that it is in a conducting state) and that is turned off (hereinafter, it means that it is in a non-conducting state or a non-conducting state) in response to a combustion stop operation by manual operation of the ignition operating means C. 26 is connected between both ends of the series circuit to form a valve opening maintaining closed circuit L1, which is a safety device according to the present invention. The order of arrangement in the valve-opening maintaining closed circuit L1 is arbitrary, and is not limited to the embodiment shown in FIG. This is because the switch 2 or the changeover switch 26 is turned on, or the positive temperature coefficient thermistor 24 has a high resistance value and the current value supplied from the dry battery 25 to the valve opening holding coil 23b. Is sufficient if it is less than or equal to the minimum valve opening holding current value.

As shown in FIG. 3, in the thermocouple drive relay 10, the thermocouple contact 1a of the thermocouple 1 is installed in the vicinity of a burning portion of the burner 22. The burner 2
2, the thermocouple contact 1a is heated, and the thermoelectromotive force generated by the thermocouple 1 causes the electromagnet core 3a to be heated.
b, the conduction state of the switch 2 composed of the electrodes 2a, 2b and the conductor piece 5 is maintained.
Incidentally, the artificial ignition operation by the ignition operation means C is linked with the suction means 7 to turn on the switch 2.
Specifically, for example, when the artificial ignition operation is a rotation operation of an operation knob, the rotation movement is converted into a linear movement by a cam or the like, and the slide member 7b as the suction means 7 is pushed in. The switch 2 is turned on. If the burner 22 stops burning for some reason after the switch 2 is once turned on, the thermoelectromotive force is reduced or extinguished, and the switch 2 is turned on, and at the same time, the current supplied to the valve opening holding coil 23b. Is also shut off, and the electromagnetic on-off valve 23 cannot be maintained in the open state and is closed.

The positive temperature coefficient thermistor 24 is a temperature-sensitive variable resistance means whose resistance increases when the temperature of the object to be heated increases, and the temperature of the object to be heated is set to a set temperature (for example, about 2 ° C.).
When the temperature exceeds (00 ° C.), the current value supplied to the valve-opening holding coil 23b becomes high enough to decrease below the minimum valve-opening holding current value. That is, as shown in FIG. 4, the positive temperature coefficient thermistor 24 is disposed so as to come into contact with an object to be heated, for example, the bottom of a cooking pot.
When the temperature exceeds (° C.), the resistance value sharply increases, and the current supplied to the valve-opening holding coil 23b rapidly decreases to maintain the open state of the electromagnetic on-off valve 23. The current value is smaller than the minimum valve opening holding current value.

As shown in FIG. 3, both ends of the dry battery 25 and the changeover switch 26 connected in series with the valve-opening maintaining closed circuit L1 are connected in parallel with other portions of the valve-opening maintaining closed circuit L1. An ignition valve opening circuit L2 is provided. The ignition valve opening circuit L2 includes an ignition transformer 28 for causing the burner 22 to perform an ignition operation by an ignition plug 29.
And the valve opening operation coil 23a connected in parallel;
An ignition switch 27, which is turned on in response to the ignition operation by the manual operation of the ignition operation means C and returns to the off state after a lapse of a predetermined time which is continuously determined or automatically determined, is formed in series connection. The ignition switch 27
During the time from turning on to returning to the off state, the electromagnetic opening / closing valve 23 is opened, the ignition operation of the burner 22 is completed, and the burner 22 is heated, and the thermocouple 1 A constant overheating time sufficient to generate a thermoelectromotive force capable of maintaining the conduction state of the switch 2 is set.

FIG. 5 shows the electric circuit configuration shown in FIG. 3 wherein the valve-opening maintaining closed circuit L1 and the ignition valve-opening operating circuit L2
FIG.

Next, the operation of the gas stove having the above configuration will be described. When the ignition operation means C is operated for ignition, the changeover switch 26, the ignition switch 27, and the switch 2 are turned on, and a current path from the dry battery 25 to the ignition valve operating circuit L2 is established. It is formed. Thereby, the valve opening operation coil 23a
A current exceeding the minimum current value of the valve-opening operation is supplied to the solenoid valve, and the electromagnetic on-off valve 23 opens to oppose the valve-closing urging force of the urging means, and fuel supply to the burner 22 is started. At the same time, the ignition transformer 28 is energized, the ignition by the ignition plug 29 is started, and the burner 22 is ignited.

After the heating of the burner 22 is started and the ignition switch 27 returns to the off state after a certain period of time has elapsed and the energization of the valve opening operation coil 23a is stopped,
A thermoelectromotive force capable of holding the conduction state of the switch 2 is generated in the thermocouple 1 and the switch 2 is continuously turned on to form the valve-opening maintaining closed circuit L1. A current exceeding the minimum valve opening holding current value is supplied to the valve opening holding coil 23b,
Is maintained, and the combustion of the burner 22 is continued.

If the temperature of the object to be heated reaches an abnormally high temperature exceeding the set temperature while the burner 22 is burning and heating the object to be heated, the positive temperature coefficient thermistor 24 The resistance value rises sharply, and the current value supplied to the valve-opening holding coil 23b becomes a very small value equal to or less than the valve-opening holding minimum current value. As a result, the electromagnetic on-off valve 23 is switched to the closed state by the urging force of the urging means, and the combustion of the burner 22 is stopped.

When the burner 22 burns and heats the object to be heated while the burner 22 is extinguished due to overflow of boiling water or boiling water of the object to be heated, Since the heating of the thermocouple 1 is stopped, the thermoelectromotive force generated in the thermocouple 1 decreases or disappears, and the switch 2 is turned off.
Is switched to the valve-closed state by the urging force of the urging means, and the fuel supply to the burner 22 is stopped, so that the fuel is prevented from being discharged for a long time.

In the state where the burning of the burner 22 is continued without occurrence of abnormalities such as the abnormal heating of the object to be heated and the fire extinguishing of the burner 22, the manual operation of the ignition operating means C is performed. By the combustion stop operation, the changeover switch 26 is turned off, the energization to the valve opening holding coil 23b is stopped, and the electromagnetic on-off valve 23 is switched to the valve closed state by the urging force of the urging means. Stops burning.

(Another Embodiment) Another embodiment will be described below.

(1) In one embodiment of the thermocouple drive type relay shown in FIG. 1, when the electromagnet attracting member 4 is in the separated state, the electrical connection between the two electrodes 2a and 2b is cut off, While the positions of the contacts 2c and 2d with respect to the conductor piece 5 are set so as to be conductive when the attracting member 4 is in the attracting state, the two electrodes 2a are set when the electromagnet attracting member 4 is in the separated state. 2b, the positions of the contacts 2c and 2d are set on the opposite side of the electroconductive core 5 from the electromagnet core 3b so that the electric connection between the electromagnet and the electromagnet attracting member 4 is cut off when the electromagnet attracting member 4 is in the attracted state. It may be arranged.

The electrode sharing the conductor section 5 is the electrode 2
a and 2b may be provided so that three or more electrodes may be intermittently connected at the same time, and electrical connection may be interrupted by another conductor section insulated from the conductor section 5 and the conductor section. Alternatively, another electrode may be provided on the same magnet case 8a. In this way, two or more sets of switches that operate simultaneously but form an independent electric path may be configured so that when one is turned on, the other switch is turned off. With such a configuration, for example, it is possible to easily realize that the energization of the solenoid valve coil in the fuel supply path is cut off and the alarm device is operated.

(2) Although the conductor piece 5 is integrated with the electromagnet attracting member 4 via the rod 7a, the conductor piece 5 may be directly attached to the electromagnet attracting member 4. . Since the rod 7a is fixed to the electromagnet attracting member 4, even if the conductor piece 5 is attached to either the rod 7a or the electromagnet attracting member 4, the basic operation effect on the conductor piece 5 is the same. It is.

(3) It is also a preferred embodiment that the casing 8 of the thermocouple-driven relay shown in FIG. 1 has a closed structure. In that case, for example, the magnet case 8
a, an O-ring seal is inserted into the gap between the rod 7a and the opening 8e provided at the center of the wall portion opposing the magnet holder 8b, and the periphery of the eyelet 8d and the electrodes 2a, 2b The casing 8 may be hermetically sealed by sealing the periphery of a penetrating part which partially penetrates the cylindrical outer wall of the magnet case 8a.

It is also preferable that an inert gas such as nitrogen is sealed in the sealed casing 8.

Further, a part of the wall of the magnet case 8a may be formed of an elastic member, or the electrodes 2a, 2a
Instead of sealing the periphery of the penetrating part where a part of b penetrates the cylindrical outer wall of the magnet case 8a, it is preferable to cover the cylindrical outer wall of the magnet case 8a with a rubber sheet or the like.

(4) The material and shape of each part of the thermocouple-driven relay according to the present invention are not necessarily limited to those described in the above embodiment. The electrically insulative and conductive materials may be any materials having insulating and conductive properties, respectively. Further, the two kinds of metals of the thermocouple 1 may be a combination of other metals forming a thermocouple other than Constantan and Inconel.

(5) The suction means 7 comprises the rod 7a,
Instead of mechanical means composed of the slide member 7b and the cushion spring 7d, both ends of the electromagnet coil 3a are drawn out of the casing 8 and connected to electrodes different from the electrodes 2a and 2b, respectively. Preferably, the electrodes are provided at appropriate locations on the outer wall of the magnet case 8a. The electromagnet coil 3a is energized by applying a voltage equal to or higher than the thermoelectromotive force generated by the thermocouple to the separately provided electrode, and the electromagnet attracting member 4 is pressed against the urging force of the spring 6 to generate the electromagnet core. A sufficient electromagnetic force is generated to cause the electromagnet suction member 4 to be attracted to the electromagnet core 3b.

Further, the suction means 7 need not always be provided. The ampere-turn is increased by suppressing the internal resistance of the electromagnet coil to be low, and the urging force of the urging means is suppressed to a necessary minimum. The electromagnet attracting member and the electromagnet core are configured to generate an electromagnetic force sufficient to bring the electromagnet core into an attracting state, so that the electromagnet coil is energized and the electromagnet coil does not rely on the attracting means. It is also preferable that the attracting member is configured to be able to be attracted to the electromagnet core.

(6) In the safety device of the above embodiment, the case where the positive temperature coefficient thermistor 24 is used has been exemplified. Alternatively, a temperature measuring resistor whose resistance value becomes higher as the temperature becomes higher may be used. Also, for example, using a temperature-sensitive switch that becomes conductive when the temperature of the object to be heated is lower than the set temperature, such as bimetal, and becomes non-conductive when the temperature of the object to be heated exceeds the set temperature. Is also good.

(7) In the safety device of the above embodiment, the case where the dry battery 25 is used as the DC power supply is exemplified, but a configuration in which a commercial AC power supply is converted into a DC power supply may be used.

(8) In the safety device of the above embodiment, the case where the safety device is used for a gas stove has been exemplified. However, the safety device of the present invention is not limited to the gas stove, but is applied to a combustion control device such as a hot water supply device or a fan heater. Is also good.

[0055]

As described above, according to the present invention,
In a thermocouple-driven relay in which the electrical connection between two electrodes is interrupted in accordance with the temperature state detected by the thermocouple, the variation of the on / off point of the electrical connection is suppressed, and the on / off operation is reliably performed. With this configuration, it is possible to provide a thermocouple-driven relay that can be applied to safety devices such as a combustion device, has a high degree of freedom in an application range such as an installation place, and has high reliability. The safety device of the combustion device can be realized.

[Brief description of the drawings]

FIG. 1 is a three-side view showing the structure of a thermocouple-driven relay according to the present invention.

FIG. 2 is an equivalent circuit diagram of a thermocouple-driven relay according to the present invention.

FIG. 3 is an electric circuit configuration diagram of a gas stove including a safety device according to the present invention.

FIG. 4 is a characteristic diagram of a thermistor;

FIG. 5 is a circuit diagram of a main part of a gas stove including a safety device according to the present invention.

FIG. 6 is a circuit diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermocouple 2 Switch 2a, 2b Electrode 3 Electromagnet 3a Electromagnet coil 3b Electromagnet core 4 Electromagnet adsorption member 5 Conductor section 6 Energizing means 7 Adsorption means 8 Casing 10 Thermocouple drive type relay 21 Fuel supply path 22 Burner 23 Electromagnetic open / close valve 23a Valve opening operation coil 23b Valve opening holding coil 24 Positive characteristic thermistor 25 Dry cell 26 Changeover switch 27 Ignition switch 28 Ignition transformer 29 Ignition plug C Ignition operating means

Continued on the front page (72) Inventor Masanaga Nishiura 1-152 Oka, Minami-shi, Minato-ku, Osaka, Osaka Prefecture Inside Herman Co., Ltd. (72) Inventor Toshimitsu Sugawara 309 Toyama, Takizawa-mura, Takizawa-mura, Iwate-gun, Iwate Prefecture Mikniadec Inc. (72) Inventor Isao Kobayashi 309 Takizawa, Takizawa-mura, Iwate-gun, Iwate Prefecture

Claims (6)

[Claims] 1. A thermocouple-driven relay in which electrical connection between two electrodes is interrupted in accordance with a temperature state detected by a thermocouple, comprising: an electromagnet coil connected in series with the thermocouple; An electromagnet core constituting an electromagnet, an electromagnet attracting member capable of adsorbing or separating from the electromagnet core, a conductor piece attached to the electromagnet attracting member, and the electromagnet attracting member being attached to the electromagnet core. An urging means for urging the electromagnet adsorbing member to the electromagnet core against an urging force of the urging means by an external operation; and The electromagnet attracting member is configured to maintain and maintain the attracted state of the electromagnet attracting member and the electromagnet core against the urging force of the urging means without using the attracting means. And the relative position of the conductor piece and the two electrodes such that the attraction / separation state of the electromagnet core corresponds to the on / off state or the off / on state of the electrical connection between the two electrodes, respectively. A relationship is set, and at least the electromagnet coil, the electromagnet core, the electromagnet attracting member, the conductor piece, and a contact portion with the conductor piece of the two electrodes are provided in a single casing. Thermocouple driven relay. 2. A thermocouple-driven relay in which electrical connection between two electrodes is interrupted in accordance with a temperature state detected by a thermocouple, comprising: an electromagnet coil connected in series with the thermocouple; An electromagnet core constituting an electromagnet, an electromagnet attracting member capable of adsorbing or separating from the electromagnet core, a conductor piece attached to the electromagnet attracting member, and the electromagnet attracting member being attached to the electromagnet core. An energizing means for energizing the separated state is provided.During energization of the electromagnet coil, an electromagnetic force sufficient to bring the electromagnet attracting member and the electromagnet core into an attracting state against the energizing force of the energizing means is provided. The electromagnet is configured to be generated, and the attraction / separation state between the electromagnet attracting member and the electromagnet core is set to an on / off state or an off / on state of an electrical connection between the two electrodes. The relative position relationship between the conductor piece and the two electrodes is set so as to correspond to each one-to-one, and at least the electromagnet coil, the electromagnet core, the electromagnet attracting member, the conductor piece, and the two A thermocouple-driven relay including a contact portion of the electrode with the conductor piece in a single casing. 3. The thermocouple-driven relay according to claim 1, wherein the casing has a sealed structure. 4. The thermocouple-driven relay according to claim 3, wherein an inert gas is sealed inside the casing. 5. A part or all of a wall portion separating an inside and an outside of the casing is formed of an elastic body.
Or a thermocouple-driven relay according to 4. 6. The thermocouple drive type according to claim 1, wherein the two electrodes are electrically connected when the electromagnet attracting member and the electromagnet core are attracted. A safety device for a combustor using a relay, wherein a thermocouple of the thermocouple drive type relay is installed near a combustion portion of the combustor, and a fuel supply passage of the combustor is provided between the two electrodes. A safety device in which a valve opening holding coil of a mounted electromagnetic valve, a positive temperature coefficient thermistor for detecting an overheating state of a predetermined portion of the combustor, and a DC power supply are connected in series.