JP2007093364A - Displacement detection device and gas supply control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement detection device, capable of switching a contact point into an ON/OFF state, when an external force in some or higher degree is applied, and a gas supply control system that uses the device. <P>SOLUTION: When external force, such as quake of an earthquake, is applied to a casing 202, a spindle 213 is moved vertically or sidewards, and an L-shaped metal fitting 216 is tilted against the third compression spring. Additionally, an adjusting spring 221 presses the first contact point plate 223, comprising a plate spring, to disconnect the contact between the first and second contact points 224, 226. The gas supply control system for performing automatic fire extinguishing gas flame at the time of earthquake generation can be realized, by combining the displacement detection device with an existing gas safety device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a displacement detection device that detects some displacement such as vibration during an earthquake and changes an electrical contact, and a gas supply control system using the displacement detection device. The present invention relates to a displacement detection device suitable for performing at the same time and a gas supply control system that cuts off the supply of gas in use during an earthquake using the displacement detection device.

  Japan is an earthquake-prone country, and various preparations for earthquakes are required. In the event of an earthquake, it is most important to protect your life, but when using gas appliances such as gas stoves, it is also important to extinguish the fire of the gas and prevent derivative disasters from occurring. is there. Taking advantage of the lessons learned from past major earthquakes, microcomputer meters as gas meters with seismic isolation function are installed in each household. For example, when earthquake motion exceeding 400 gal continues, gas supply is shut off. It has become so.

  In addition, even in the case of a weak earthquake of about 50 gal, where the magnitude of the earthquake is smaller than this, in order to enhance the safety of the kitchen, the gas supply to each gas supply port of the gas stove is automatically shut off to extinguish the fire. It is preferable. Therefore, a wiring breaker has been proposed as one of displacement detection devices for this purpose (see, for example, Patent Document 1).

  FIG. 10 shows an outline of a gas supply control system using a mutation detection device that cuts off wiring. In the vicinity of the burner 101 of the gas stove, there is disposed a spill sensor 102 for detecting the extinction of flame due to spill during cooking (hereinafter simply referred to as spill). The blow-out sensor 102 is provided with a thermocouple, supplies an electromotive force generated by the heat of the burner 101 to the electronic circuit 103, and when this electromotive force stops during the gas supply, a gas valve (not shown) is closed. The gas supply to the corresponding burner 101 is cut off. In a gas supply control system using a mutation detection device that cuts off the wiring, one of the lead wires 105 and 106 connecting the blowout sensor 102 and the electronic circuit 103 is connected to the first terminal 108 of the displacement detection device 107. The second terminal 109 and the electronic circuit 103 are connected by another lead wire 111. The displacement detection device 107 keeps the contact 112 in an on state in a state where no earthquake has occurred.

  When an earthquake occurs, the contact 112 in the displacement detection device 107 is temporarily turned off. Alternatively, when the spill sensor 102 detects a spill during cooking in the absence of an earthquake, the flame is extinguished and the electromotive force of the thermocouple is greatly reduced. When the electronic circuit 103 detects such a change in electromotive force, the gas valve is closed by releasing the adsorption of an electromagnet (not shown).

  In this gas supply control system, once the contact 112 in the displacement detection device 107 is turned off, the gas valve remains closed, and the gas supply to the corresponding burner 101 is not performed unless the gas ignition operation is performed again. Is stopped. Therefore, even if the shaking of the earthquake disappears, supply of gas to the burner 101 is not started without permission.

  FIG. 11 shows the basic configuration of a conventionally proposed displacement detection apparatus. In this displacement detection device 107, a support portion 124 that rotatably supports a flange 123 attached to the lower end of a cylindrical pendulum shaft 122 is disposed on a bottom surface that constitutes a part of an inner surface of a casing 121 as a case. Yes. The tip end portion of the annular protrusion 126 provided on the lower side of the penetrating shaft 122 penetrating through the pendulum shaft 122 opened at the upper portion of the support portion 124 is in contact with the upper surface of the flange 123. A first spring 127 is disposed between the lower surface of the flange 123 and the bottom surface of the housing 121 in a constantly compressed form, whereby the upper surface of the flange 123 is pressed against the tip of the annular protrusion 126. Yes.

  A metal weight 131 is loosely fitted on the top of the pendulum shaft 122. A second spring 132 is fitted between the weight 131 and the upper surface of the support portion 124. Therefore, when the casing 121 vibrates in the vertical or horizontal direction due to an external force such as an earthquake, the weight 131 vibrates in the vertical direction by the action of the inertia force and the second spring 132, or in a pendulum shape with the flange 123 as a fulcrum. It will shake. In a normal state in which the weight 131 does not cause such vibration, a horizontal portion 134A of the L-shaped metal fitting 134 is disposed in the lower half cylindrical portion 131A so as to be close to the outer peripheral portion. The lower end portion of the vertical portion 134 </ b> B of the L-shaped metal fitting 134 is fixed to the bottom of the housing 121 by a fixing metal fitting 135.

  FIG. 12 shows a state in which the horizontal portion and the weight are cut in the horizontal direction at the position of the horizontal portion located above the L-shaped metal fitting. The horizontal portion 134A of the L-shaped bracket is V-shaped, and the pendulum shaft 122 is loosely fitted into a through hole 136 that penetrates the center of the weight 131 in the vertical direction. A two-dot chain line 141 indicates the maximum diameter constituting the upper surface of the weight 131. When the weight 131 shown in FIG. 11 vibrates in the vertical direction by the action of the second spring 132, the contact position between the horizontal portion 134A and the weight 131 approaches the position of the two-dot chain line 141. As a result, the horizontal portion 134A receives a force for moving its position in the direction of the arrow 142. Even when the weight 131 swings in a pendulum shape with the flange 123 as a fulcrum, when the swing is accompanied by movement in the direction of the arrow 142, the horizontal portion 134A similarly receives a force for moving its position in the direction of the arrow 142.

The L-shaped metal fitting 134 is configured by a leaf spring. As shown in FIG. 11, a convex contact 145 is fixed to the surface on the pendulum shaft 122 side in the middle of the vertical portion 134B. In a state where the L-shaped metal piece 134 is not in contact with the weight 131, the contact 145 is in contact with the contact plate 146 fixed at a predetermined position of the housing 121 with a predetermined spring pressure. The L-shaped metal fitting 134 itself is a conductor, and a lead wire 147 connects the fixing metal fitting 135 disposed on the lower end side of the L-shaped metal fitting 134 and the second terminal 109. Further, the contact plate 146 and the first terminal 108 are connected by another lead wire 148. Therefore, the horizontal portion 134A of the L-shaped bracket receives a force in the direction of the arrow 142 (FIG. 2) due to the vertical movement or horizontal movement of the weight 131, and as a result, the contact 145 is separated from the contact plate 146 and is in a non-contact state. It becomes. Then, between the first and second terminals 108 and 109 changes from a conductive state to a non-conductive state. Based on such a principle, for example, if an earthquake occurs and the seismic intensity exceeds a certain level, the electronic circuit 103 shown in FIG. 10 is activated and the gas supply is stopped.
JP 2002-328060 A (paragraphs 0012 to 0016, FIGS. 1 and 2)

  However, in the conventional displacement detection device 107 shown in FIGS. 11 and 12, even if the weight 131 is operated, the conduction state between the first and second terminals 108 and 109 is switched from the non-conduction state. There is a problem that it is not necessarily performed with high reliability and detection accuracy is low. This is because the electrical contact between the contact 145 and the contact plate 146 is pushed to some extent because it is necessary to securely keep the first and second terminals 108 and 109 in a conductive state in the absence of an external force such as an earthquake. This is because the L-shaped metal fitting 134 is constituted by a leaf spring. That is, in this proposal, the L-shaped metal fitting 134 is configured by a plate spring and the lower end thereof is fixed by the fixing metal fitting 135, so that the contact 145 and the contact plate 146 are reliably in contact with each other by the spring pressure. However, even if the weight 131 moves and pushes the horizontal portion 134A of the L-shaped bracket in the direction of the arrow 142 in FIG. 12, one end of the vertical portion 134B made of a leaf spring is pushed. Accordingly, the vertical portion 134B is bent and the contact 145 cannot be stably separated from the contact plate 146 unless a considerable force is applied. In addition, since both the lower portion of the vertical portion 134B and the contact plate 146 are fixed to the housing 121, their positions cannot be adjusted in order to adjust the contact pressure between the contact 145 and the contact plate 146.

  Therefore, the operator needs to set the contact 145 and the contact plate 146 on / off while finely adjusting the inclination of the vertical portion 134B of the L-shaped bracket from the vertical direction. The adjustment angle of the inclination of the vertical portion 134B from the vertical direction is naturally different in each displacement detection device 107. When the skill level of the operator is low, the magnitude of the external force that is switched on / off is large. There was a problem of difference. In addition, since the characteristics fluctuate greatly depending on the width, length or thickness of the L-shaped metal fitting constituting the leaf spring, sufficient accuracy is required for molding the L-shaped metal fitting.

  Furthermore, the displacement detection device 107 shown in FIG. 11 has a structure in which one system of contacts is turned on / off, but when a gas stove is taken as an example, a plurality of devices such as a normal gas burner, a fish roaster, or a grill are used. Burners are often used at the same time. It is uneconomical to use as many displacement detectors 107 as the number of burners to extinguish these simultaneously. For this reason, if the displacement detection device 107 has a structure having a plurality of on / off contacts, it is necessary to provide a plurality of sets of contacts on the L-shaped metal fitting 134. Working reliably for size was associated with considerable difficulty.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a displacement detection device capable of reliably turning on / off a contact when a certain external force is applied, and a gas supply control system using the displacement detection device.

  Another object of the present invention is to provide a displacement detection device capable of simultaneously turning on and off a plurality of system contacts when an external force of a certain level or more is applied, and a gas supply control system using the same. .

  In the present invention, (a) a weight that is arranged inside the housing and moves in a horizontal or vertical direction relative to the housing by an inertial force according to a displacement acting on the housing; A plate-like conversion member that converts the amount of movement of the weight into a change in the inclination angle in a specific inclination direction; (c) a movement member that moves in a specific direction in accordance with the change in the inclination angle of the conversion member; When the moving member moves in the above-described specific direction by a predetermined amount or more, (e) a first contact attached to the elastic body, and (e) facing the first contact. The displacement detection device is provided with a second contact that is fixed to the housing at the position to be turned on and is switched on / off with the first contact according to the displacement of the elastic body.

  That is, according to the present invention, a weight that moves in a horizontal or vertical direction relative to the housing with an inertial force according to the displacement acting on the housing is disposed inside the housing that constitutes the displacement detection device. This movement of the weight is converted into a change in inclination angle in a specific inclination direction by the conversion member, and further converted into a movement amount in a specific direction by the moving member. The moving amount of the moving member displaces the elastic body and displaces the first contact point accordingly. There is a second contact at a position facing the first contact, and both contacts are switched from on to off or from off to on by displacement of the first contact.

  Here, the moving member is formed of, for example, a plate material bent into an L shape including a vertical portion and a horizontal portion, the lower end of the vertical portion is rotatably supported on the bottom portion of the casing, and the horizontal portion is a weight. When the weight is stationary, it keeps a non-contact state, and when the weight moves with the inertial force according to the displacement acting on the housing, it touches and presses the weight to incline the vertical part. The attached advanceable / retractable rod-shaped member may be moved in the above-described specific direction. In addition, a plurality of first contacts are arranged in an insulating state on the elastic body, and a plurality of sets of second contacts are provided corresponding to the first contacts, and a bar member that can be moved back and forth is also provided. If a plurality of contacts are arranged in correspondence with each other, the contacts of a plurality of systems can be turned on / off all at once. Further, a spring having one end arranged in the vertical portion so as to resist the tilting force of the vertical portion of the plate member and a sensitivity adjusting means for adjusting the distance between the other end of the spring and the one end described above are provided. For example, the sensitivity level of displacement detection can be adjusted by adjusting the position of the spring with the adjusting means.

  In the present invention, (b) a thermocouple arranged at a position where a temperature change occurs due to a gas flame, and (b) receiving an electromotive force supply from the thermocouple via a pair of lead wires, An electronic circuit that stops the supply of gas when the supply of electromotive force is stopped during the supply of gas, and (c) one of two points as a cutting point formed by cutting one of the pair of lead wires is the first. And the other contact is connected to the second contact, and the first contact and the second contact are switched from on to off when the supply of electromotive force is stopped during the supply of gas. A displacement detection device according to any one of claims 1 to 4 is provided in a gas supply control system.

  That is, according to the present invention, the contact that switches from on to off when the displacement detection device described above detects displacement is connected in series with the thermocouple and connected to the electronic circuit, thereby supplying the electromotive force during the gas supply. It is possible to easily realize a gas supply control system that stops the supply of gas when the gas stops.

  As described above, according to the present invention, when the horizontal or vertical movement of the weight caused by the change in the external force acting on the casing due to an earthquake or the like is converted into the change in the inclination angle, the contact is immediately switched using this. Instead of performing the above, the moving member that moves in a specific direction according to the change in the inclination angle is converted into the moving amount and converted into the displacement of the elastic body having the contact point. By changing the distance, it is possible to reliably detect displacement, that is, to switch the contacts on / off with respect to the magnitude of the external force determined to some extent. Therefore, the variation of the displacement detection device as an industrial product can be minimized, and the man-hours for adjustment can be reduced to contribute to cost reduction.

  In addition, by using such a displacement detection device, the existing gas safety system using thermocouples can be easily upgraded to a gas supply control system for earthquake countermeasures, as a fire prevention measure in the event of an earthquake. It is possible to provide a powerful and inexpensive means.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows the internal structure of a displacement detection apparatus according to an embodiment of the present invention. The displacement detection device 201 is a device incorporated in a plastic housing 202. A cylindrical pendulum shaft 203 has a flange 204 fixed to the lower end thereof, and a shaft support portion 205 that rotatably supports the flange 204 is disposed at the bottom of the housing 202. The shaft support part 205 has a through-hole 206 that penetrates the pendulum shaft 203 at the upper center. As shown in the figure, the through hole 206 forms a part of an annular protrusion 207 that is substantially equal to the diameter of the pendulum shaft 203 at the position of the upper surface of the shaft support portion 205 and increases in diameter toward the lower side. The downward protruding tip 207 </ b> A of the annular protrusion 207 is in contact with the upper surface of the flange 204. This contact is achieved by the first pendulum shaft 203 mounted on the pendulum shaft 203 between the retaining ring 209 positioned and fixed at a predetermined position of the pendulum shaft 203 protruding from the shaft support portion 205 and the upper surface of the shaft support portion 205. It is secured by the compression spring 211. A second compression spring 212 is mounted on the pendulum shaft 203 above the retaining ring 209. In the state where the upper part of the pendulum shaft 203 is loosely fitted in the upper part of the second compression spring 212 in the through hole 214 in which the metal weight 213 penetrates the center part in the vertical direction, its own weight is the second weight. It is stationary at a position that keeps balance with the compression spring 212. That is, in the state where no external force is applied to the housing 202 itself, the circular protrusion tip portion of the annular protrusion 207 is uniformly in contact with the upper surface of the flange 204 by the action of the first compression spring 211. The pendulum shaft 203 with the weight 213 attached to the upper portion holds the vertical position as shown.

Meanwhile, the weight 213 constitute a large-diameter portion 213A in which the circular predetermined diameter upper portion thereof over the length L _1, the small diameter portion 213C in which the circular lower portion in diameter than this over the length L ₃ smaller It is composed. These large-diameter portion 213A and a small-diameter portion length L ₂ of the section between 213C constitutes a tapered portion 213B whose diameter varies linearly between the two. When the inertial force with respect to the external force does not act on the weight 213 and this balances with the second compression spring 212 due to its own weight, the horizontal portion 216A is positioned substantially at the center of the small diameter portion 213C as shown in the figure. An L-shaped metal fitting 216 is disposed on the left side. The L-shaped metal fitting 216 has a hole portion of the rotation support portion 217 in which projecting pieces 216C (two places) projecting from the lower end portion of the vertical portion 216B in the direction perpendicular to the paper surface in the drawing project from the bottom portion of the housing 202 (see FIG. 3). And are loosely fitted. Thereby, the L-shaped metal fitting 216 is freely rotatable with the protruding piece 216C as a fulcrum.

  In addition, one end of a third compression spring 219 is disposed at the end of the push screw 218 screwed into the opening formed in the side wall of the housing 202. The third compression spring 219 pushes the vertical portion 216B of the L-shaped bracket in the direction of the arrow 220 with a relatively weak force, and the other end of the horizontal portion 216A is not applied to the L-shaped bracket 216. The portion is in contact with the protruding portion 202A that forms the opposite side wall of the housing 202. The pressing screw 218 can adjust the pressing force with respect to the vertical portion 216B of the L-shaped bracket by its advancement and retraction. Further, when the third compression spring 219 does not have appropriate elasticity, the push screw 218 can be removed once and replaced. By adjusting with the push screw 218 and exchanging the third compression spring 219, the displacement detection device 201 can be adapted to various external force magnitudes (seismic intensities that act in the event of an earthquake).

  FIG. 2 shows the positional relationship between the shape of the horizontal portion of the L-shaped bracket and the small diameter portion of the weight in the state shown in FIG. The horizontal portion 216A of the L-shaped bracket is roughly U-shaped, and the small-diameter portion 213C of the weight is arranged in a non-contact state with the horizontal portion 216A in the space portion surrounded by the three sides.

  Returning to FIG. 1, the description will be continued. When the pendulum shaft 203 is maintained in the vertical state as shown in FIG. 1, the L-shaped metal fitting 216 is not affected by the weight 213, and the vertical portion 216B is also maintained in the vertical state. Unlike the conventionally proposed L-shaped metal fitting 134 shown in FIG. 11 formed of a leaf spring, the L-shaped metal fitting 216 of the present embodiment processes a normal sheet metal that is difficult to bend. A screw hole (not shown) is formed at a position approximately half the height of the vertical portion 216B, and a plastic adjustment screw 221 is screwed in with its head positioned on the pendulum shaft 203 side. The reason why the adjustment screw 221 is made of plastic in this embodiment is to secure insulation and to reduce the weight. If there is no such necessity, a normal metal screw may be used.

  A vertical portion 223A of the first contact plate 223 bent in an L-shape is disposed at a position slightly away from the end of the adjustment screw 221 on which the screw is engraved. The end of the horizontal part 223B of the first contact plate 223 constitutes the first terminal 108 as shown in FIG. A first contact 224 is formed on the side of the first contact plate 223 facing the L-shaped metal fitting 216 of the vertical portion 223A. In the space between the vertical portion 223A of the first contact plate and the vertical portion 216B of the L-shaped metal fitting, the vertical portion 225A of the second contact plate 225 that is also bent in an L shape is disposed. The second contact plate 225 is formed of a normal sheet metal that is difficult to bend. The vertical portion 225A of the first contact plate is not in contact with the adjusting screw 221. A second contact 226 that is in a pressure contact state is disposed. The end of the horizontal portion 225B of the second contact plate constitutes the second terminal 109 also shown in FIG.

  By the way, the case 202 of the displacement detector of the present embodiment is a compact one having a height of about 5 cm, a width of 3.5 cm, and a depth of about 3 cm. This displacement detection device 201 may be attached to a predetermined position of the gas stove or kitchen by using a dedicated mounting bracket (not shown). However, in this embodiment, a strong permanent magnet 227 is incorporated in a part of the housing 202. It is out. Therefore, using this permanent magnet 227, the displacement detection device 201 can be magnetically firmly fixed to the inside of the gas stove or the metal portion around the kitchen. Further, the mounting position of the displacement detection device 201 can be easily changed without using a tool, and this can be arranged at an optimal place.

  FIG. 3 shows the relationship between the vertical portion of the L-shaped metal fitting of the present embodiment and the first and second contact plates. This figure shows a state in which the L-shaped metal fitting 216 is cut in the II direction in FIG. The projecting pieces 216C and 216C constituting the lowermost end portion of the L-shaped metal fitting 216 are loosely fitted in the hole portions 231 and 231 of the rotation support portion 217, respectively. Therefore, the L-shaped metal fitting 216 can swing around the projecting pieces 216C and 216C. A second contact plate 225 having a second contact 226 is disposed on the rear side of the vertical portion 216B of the L-shaped metal fitting. Behind the second contact plate 225, a first contact plate 223 having a first contact 224 is disposed.

  When the adjustment screw 221 attached to the vertical portion 216B is advanced and retracted, the distance between the tip of the screw portion and the vertical portion 223A of the first contact plate changes as shown in FIG. When the weight 213 moves and the L-shaped metal fitting 216 tilts in the direction opposite to the arrow 220, the adjustment screw 221 contacts the vertical portion 223A of the first contact plate. When the L-shaped metal fitting 216 is further inclined, the adjusting screw 221 pushes the vertical portion 223A of the first contact plate in the direction opposite to the arrow 220. Since the first contact plate 223 is made of a thin spring material, the vertical portion 223A changes the inclination angle in proportion to the displacement of the adjustment screw 221, and in this process, the first contact 224 and the second contact 226 are changed. Will leave. As described above, the adjusting screw 221 has a role of adjusting the on / off sensitivity of the first contact 224 and the second contact 226, and the operator adjusts the advancement / retraction thereof with a fixing means such as an adhesive. Fix it.

  FIG. 4 shows a state in which a lateral external force is applied to the displacement detection device of this embodiment. The weight 213 receives a horizontal force by the action of a horizontal external force such as a roll of an earthquake, and comes into contact with the root 241 (see FIG. 2) of the U-shaped portion divided into two branches of the horizontal portion 216A of the L-shaped bracket, When this is pushed, the vertical portion 216B tilts against the third compression spring 219 as shown in FIG. Thereby, the adjusting screw 221 presses the vertical portion 223A of the first contact plate in the same direction. As described above, the first contact plate 223 is formed of a thin leaf spring. Therefore, the tilting force of the vertical portion 216B is transmitted straight to the vertical portion 223A, and tilting according to this is realized. As a result, if the L-shaped metal fitting 216 is inclined by a predetermined angle or more by the weight 213, the first contact 224 is reliably separated from the second contact 226.

  FIG. 5 shows the moving state of the small diameter portion of the weight with respect to the horizontal portion of the L-shaped bracket at the position shown in FIG. 2 when an external force in the horizontal direction is applied. For example, the roll of an earthquake may occur in various directions, and the force in the direction in which the weight 213 directly pushes the root 241 of the U-shaped portion divided into the fork of the horizontal portion 216A of the L-shaped bracket in the direction of the arrow 251 is directly applied. It does not work. That is, when rolling occurs in the weight 213, the small-diameter portion 213C of the weight comes into contact with each portion of the inclined portion constituting the U-shape and moves in various directions as indicated by a two-dot chain line depending on the mode. The horizontal portion 216A of the L-shaped metal fitting has an opening in the direction opposite to the arrow 251 direction (the arrow 220 direction in FIG. 1). Therefore, as a whole, a component force in the direction of the arrow 251 is intermittently applied to the L-shaped metal fitting 216 by the small diameter portion 213C. Due to this force, the L-shaped metal fitting 216 moves to the position indicated by the two-dot chain line in the direction of the arrow 251, and when the state described with reference to FIG. 4 is reached, the first contact plate 223 is separated from the second contact 226 as illustrated. It will be. When such a state appears even once, the electronic circuit 103 shown in FIG. 10 operates and the supply of gas to the burner 101 is continuously cut off.

  FIG. 6 shows a state in which an external force in the vertical direction is applied to the displacement detection device of this embodiment. When an external force in the vertical (vertical) direction, such as a vertical shake of an earthquake, acts on the casing 202, and thereby the weight 213 receives a vertical force, the second compression spring 212 is expanded and contracted accordingly. In the figure, the second compression spring 212 is shown in a compressed state. In this state, the taper portion 213B of the weight pushes the root 241 of the U-shaped portion divided into the forked portion of the horizontal portion 216A of the L-shaped bracket, thereby applying a force that moves in the direction of the arrow 251. As a result, the vertical portion 216B is inclined as shown in FIG. 6 against the third compression spring 219. As a result, the adjustment screw 221 presses the vertical portion 223A of the first contact plate in the same direction, and the first contact 224 is separated from the second contact 226. At this moment, the electronic circuit 103 shown in FIG. 10 is activated, and the supply of gas to the burner 101 is continuously cut off.

  If the action of the external force in the horizontal direction or the vertical direction described above disappears after the earthquake is stopped, the weight 213 returns to the state shown in FIG. Until this time, the first contact 224 and the second contact 226 may be repeatedly turned on and off a plurality of times, but eventually return to the on state. Thereafter, when the user of the gas stove shown in FIG. 10 performs the ignition operation of the burner 101, the first contact 224 and the second contact 226 are in the ON state in this state, so that the normal ignition is performed. Is possible. In other words, a special restoration operation for the displacement detection device 201 is not necessary.

  <First Modification of Invention>

FIG. 7 corresponds to FIG. 3 and shows the relationship between the vertical portion of the L-shaped bracket and the first and second contact plates in the first modification of the present invention. In the L-shaped metal fitting 2161 of the _first modification, the same parts as those of the L-shaped metal fitting 216 of the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Unlike the previous embodiment, the displacement detection device 201 ₁ provided with the L-shaped metal fitting 216 ₁ of the first modification has three sets of first and second terminals (108 ₁ , 109 ₁ ), (108 ₂ , 109 ₂ ), (108 ₃ , 109 ₃ ). For this reason, three adjustment screws 221 _{1 to} 221 ₃ are attached to the vertical portion 216B ₁ of the L-shaped metal fitting 216 ₁ at predetermined intervals in the horizontal direction, and three sets of screws are arranged at positions facing each other. Second contact plates 225 _{1 to} 225 ₃ are arranged. Further, three sets of first contact plates 223 _{1 to} 223 ₃ are arranged behind them. First contact points 224 _{1 to} 224 ₃ are arranged on the first contact plates 223 _{1 to} 223 ₃ , respectively. At a position opposite to these first contact ₂₂₄ 1-224 ₃ of the second contact plate ₂₂₅ 1 to 225 _3, the second contact ₂₂₆ 1-226 ₃ is arranged. The three adjusting screws 221 _{1 to} 221 ₃ are spaced slightly apart from the corresponding ones of the first contact plates 223 _{1 to} 223 _{3 in} a state where the vertical portion 216B ₁ of the L-shaped bracket is vertical. Adjustments have been made to

In the displacement detecting device 201 ₁ having such a configuration, in a state where an external force to the housing 202 as shown does not act in Figure 1, second contacts corresponding to those in the first contact ₂₂₄ 1-224 ₃ 226 _{1 to} 226 ₃ are in contact with each other. In this state, the three sets of the first and second terminals (108 ₁ , 109 ₁ ), (108 ₂ , 109 ₂ ), (108 ₃ , 109 ₃ ) are turned on.

On the other hand, as described with reference to FIG. 4 or FIG. 6 of the embodiment, a lateral or vertical external force larger than the size of the casing 202 is applied, and the weight 213 moves accordingly to move the L-shaped bracket vertically. Assume that the portion 216B ₁ is inclined at a predetermined angle or more. As a result, each of the three adjustment screws 221 _{1 to} 221 ₃ simultaneously presses the three sets of first contact plates 223 _{1 to} 223 ₃ . As a result, the three sets of first and second terminals (108 ₁ , 109 ₁ ), (108 ₂ , 109 ₂ ), (108 ₃ , 109 ₃ ) are electrically connected from on to off, respectively. Will switch.

Thus, in the case of the displacement detection device 2011 of the _first modification example, if this is used for a gas stove provided with, for example, three burners, even if the gas is supplied to these multiple locations, the earthquake With the occurrence of this, the gas supply to all of them can be cut off and the fire can be extinguished automatically. Moreover, since the three contacts can be switched simultaneously by the action of an external force without using any electrical circuit such as a relay, an extremely reliable gas supply control system can be configured.

In the first modification, the displacement detection device 201 ₁ includes three sets of first and second terminals (108 ₁ , 109 ₁ ), (108 ₂ , 109 ₂ ), (108 ₃ , 109 ₃ ). However, it is natural that there may be two sets or four or more sets.

  <Second Modification of Invention>

  FIG. 8 shows a weight moving mechanism as a second modification of the present invention. In FIG. 8, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the second modification, one end of a piano wire 262 having a predetermined thickness is embedded vertically in the center of a cylindrical protrusion 261 provided on the bottom of the housing 202. At the other end of the piano wire 262, a plastic cylindrical body 263 having the same diameter as the pendulum shaft 203 (FIG. 1) of the embodiment is molded. A metal weight 213 having a through hole 214 is inserted into the cylindrical body 263 so as to be movable up and down, and a second compression spring 212 is disposed between the weight 213 and the protrusion 261.

Also in the displacement detection device 2012 of the _second modified example, the weight 213 moves in the horizontal direction or the vertical direction according to the external force applied to the housing 202 in the horizontal direction or the vertical direction. The first contact 224 and the second contact 226 can be controlled to be turned on / off by transmitting the displacement of the L-shaped metal fitting 216 shown in the drawing such as FIG. 1 to the first contact plate 223.

According to the second modification has the advantage that it is possible to realize a displacement detecting device 201 ₂ which attained cost than Example. In the drawing, the lower end portion of the second compression spring 212 is disposed on the columnar protrusion portion 261. However, the protrusion portion 261 may have a smaller diameter and may be inserted into the lower end portion of the compression spring 212. Alternatively, the through-hole 214 of the weight may be formed as a needle hole so that the cylindrical body 263 is unnecessary, and a needle-like member rich in elasticity may be directly inserted into the needle member so as to be movable up and down.

  <Third Modification of the Invention>

FIG. 9 shows the main part of the contact on / off mechanism in the third modification of the present invention. 9, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the third modified example is constituted by a first contact plate 223 ₁ and the second contact plate 225 ₁ are both vertical plate, each end the first terminal 108 or the second terminal 109 Is configured. The first contact plate 223 ₁ is displaced by the adjusting screw 221 so need not be L-shaped bracket. The second contact 226 is sufficient if I is its position is fixed, and electrically connected to the second terminal 109, not necessarily the presence of a second contact plate 225 ₁ is required.

  In the embodiment and the modification described above, the case where the present invention is applied to the gas stove in the event of an earthquake has been described. However, the present invention is not limited to this. The present invention can be applied to various gas supply control systems that control gas supply. Of course, it can also be used as a displacement detection device that detects the displacement of land, buildings, or equipment as in the case of landslides. In this case, the combined use of the spill sensor 102 and the displacement detection device is not necessarily required. Various practical circuits can be configured by simply detecting the contact change accompanying the displacement detection of the displacement detector or by allowing the contact change to be self-held by the self-holding circuit. Of course, if it is used together with the spill sensor 102 as in the embodiment, it is possible to realize the earthquake countermeasures in the gas stove extremely inexpensively and reliably.

  Further, in the embodiment and the modified example, the case where the contact in the on state is changed to off by detecting the displacement has been described, but the case where the contact in the off state is changed to the on state is also within the scope of the present invention. Of course. In this case, a known contact switching structure can be used (see Patent Document 1). Therefore, a specific description of changing the contact in the off state to the on state is omitted.

It is sectional drawing showing the internal structure of the displacement detection apparatus in one Example of this invention. It is explanatory drawing showing the positional relationship of the shape of the horizontal part of the L-shaped metal fitting in the state shown in FIG. 1, and the small diameter part of a weight. It is II sectional drawing showing the relationship between the vertical part of the L-shaped metal fitting of a present Example, and the 1st and 2nd contact plate. It is sectional drawing of the displacement detection apparatus showing the state which the external force of the horizontal direction acted on the present Example. It is explanatory drawing showing the movement state of the small diameter part of the weight with respect to the horizontal part of the L-shaped metal fitting in the position shown in FIG. 2 when the external force of a horizontal direction acts in a present Example. It is sectional drawing of the displacement detection apparatus showing the state to which the external force of the up-down direction acted in the present Example. It is II sectional drawing showing the relationship between the perpendicular | vertical part of the L-shaped metal fitting and the 1st and 2nd contact plate in the 1st modification of this invention. It is principal part sectional drawing of the displacement detection apparatus showing the moving mechanism of the weight as the 2nd modification of this invention. It is principal part sectional drawing showing the principal part of the ON / OFF mechanism of the contact in the 3rd modification of this invention. It is a system block diagram showing the outline | summary of the gas supply control system using a displacement detection apparatus. It is sectional drawing showing the fundamental structure of the displacement detection apparatus proposed conventionally. It is the end elevation which cut | disconnected the L-shaped metal fitting and weight which were shown in FIG. 11 in the position of the height of an L-shaped metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Gas stove burner 102 Blow-out sensor 103 Electronic circuit 108 1st terminal 109 2nd terminal 201 Displacement detector 202 Case 203 Pendulum shaft 204 Flange 205 Shaft support part 207 Annular protrusion 211 1st compression spring 212 2nd compression Spring 213 Weight 214 Through-hole 216 L-shaped metal fitting 218 Press screw 219 Third compression spring (spring)
221 Adjustment screw 223 1st contact plate 224 1st contact 225 2nd contact plate 226 2nd contact 261 Protruding part 262 Piano wire 263 Cylinder

Claims (7)

A weight that is arranged inside the housing and moves in a horizontal or vertical direction relative to the housing with an inertial force according to a displacement acting on the housing;
A plate-shaped conversion member that converts the amount of movement of the weight into a change in the inclination angle in a specific inclination direction;
A moving member that moves in a specific direction in accordance with a change in the inclination angle of the conversion member;
An elastic body that displaces in response to movement of the moving member in the specific direction by a predetermined amount or more;
A first contact attached to the elastic body;
A position that is fixed to the housing at a position facing the first contact, and a second contact that switches on and off with the first contact in accordance with the displacement of the elastic body. Displacement detection device characterized.   The moving member is configured by a plate member bent into an L shape including a vertical portion and a horizontal portion, and a lower end of the vertical portion is rotatably supported on a bottom portion of the casing, and a horizontal portion is the weight. When the weight is stationary, it keeps a non-contact state, and when the weight moves with an inertial force according to the displacement acting on the housing, the vertical portion is inclined by contacting and pressing the weight. 2. A displacement detection apparatus according to claim 1, wherein a bar member which is attached to a vertical part and which can freely move is moved in the specific direction.   A plurality of the first contacts are arranged in an insulating state on the elastic body, and a plurality of sets of the second contacts are provided corresponding to the first contacts, and the rod-like member that is freely movable back and forth. The displacement detection device according to claim 2, wherein a plurality of them are arranged corresponding to these.   A spring having one end arranged in the vertical portion so as to resist the tilting force of the vertical portion of the plate member, and a sensitivity adjusting means for adjusting a distance between the other end of the spring and the one end. The displacement detection device according to claim 2.   The displacement detection device according to claim 1, wherein a part of a surface in contact with the outside of the housing constitutes a permanent magnet. A thermocouple arranged at a position where a temperature change occurs due to a gas flame;
An electronic circuit that receives supply of electromotive force from the thermocouple via a pair of lead wires, and stops supply of the gas when supply of electromotive force is stopped during supply of the gas;
One of the two points as a cutting point formed by cutting one of the pair of lead wires is connected to the first contact, the other is connected to the second contact, and the first contact and the second 6. The displacement detection device according to claim 1, wherein the contact is switched from on to off when supply of electromotive force is stopped during supply of the gas. Gas supply control system.   The gas supply control system according to claim 6, wherein the thermocouple and the electronic circuit constitute a spill sensor in a gas stove, and the displacement detector detects a displacement caused by an earthquake.

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