JP2012241854A - Gas shutoff valve and motor safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of giving an earthquake detecting function, only by component replacement, to an existing gas device with a built-in gas shutoff valve having no earthquake detecting function.SOLUTION: The gas shutoff valve 2 includes valve elements 16, 18, a valve element biasing member, an armature 28, a core 30 and a coil 32. The gas shutoff valve 2 further includes a contact member disposed in a current-carrying path to the coil 32 within the valve 2 and a contact biasing member biasing the contact member. The contact member includes a conductive member and a weight member. In the gas shutoff valve 2, the current-carrying to the coil 32 is secured by biasing the contact member by the contact biasing member. In the gas shutoff valve 2, the contact member is vibrated in the event of an earthquake and moved against the biasing by the contact biasing member, whereby the current-carrying to the coil is interrupted to close a gas passage.

Description

  The present invention relates to a gas shutoff valve and a motor safety valve incorporating the gas shutoff valve.

  Patent Document 1 discloses a gas cutoff valve having an earthquake detection function. This gas shut-off valve seals the valve opening by a valve body biased upward by a spring. A rod-shaped protrusion extending upward is formed on the valve body. When the valve body seals the valve port, the rod-shaped protrusion projects into the mover chamber in which the spherical mover is accommodated. The bottom of the mover chamber is formed in a mortar shape with the lowest point protruding from the rod-shaped protrusion. Normally, the valve element separates from the valve port when the mover pushes down the rod-shaped protrusion, and the gas shut-off valve Has been opened. When an earthquake occurs, the mover rolls and moves in the mover chamber, so that the valve body seals the valve port and the gas shut-off valve is closed.

JP-A-10-89510

  Many existing gas appliances have a gas shut-off valve that automatically closes when gas combustion stops. However, these gas shut-off valves may not have a function of automatically closing when an earthquake occurs. In order to prevent the occurrence of a disaster at the time of an earthquake, it is preferable that an existing gas device can be provided with an earthquake detection function as in Patent Document 1.

  However, in the gas shut-off valve as in Patent Document 1, it is necessary to provide a mover chamber for accommodating the spherical mover. The gas shut-off valve that is used in existing gas equipment and does not have an earthquake detection function does not have such a spherical mover or mover chamber. Accordingly, the shapes of the two are greatly different, and there is no compatibility when parts are replaced. For existing gas equipment, it was difficult to provide an earthquake detection function only by replacing parts.

  The present invention was created in view of the above-described circumstances, and can provide an earthquake detection function to an existing gas appliance incorporating a gas shut-off valve that does not have an earthquake detection function only by replacing parts. I will provide a.

  The present invention provides a valve body, a valve body urging member that urges the valve body toward a valve port, an armature that moves integrally with the valve body, and magnetized in contact with the armature. And a core that adsorbs the armature, and a gas cutoff valve that includes a coil that magnetizes the core when energized. The gas shut-off valve includes a contact member disposed in a current-carrying path to the coil in the gas shut-off valve, and a contact biasing member that biases the contact member. The contact member includes a conductive member and a weight member. In the gas shut-off valve, energization of the coil is ensured by the contact urging member urging the contact member. In the gas shut-off valve, when the earthquake occurs, the contact member vibrates, and the contact member moves against the urging by the contact urging member, whereby the energization to the coil is interrupted.

  In the gas shut-off valve described above, a contact member composed of a conductive member and a weight member is provided in the energization path to the coil inside, and a contact urging member that urges the contact member is provided, so that an automatic operation is performed when an earthquake occurs. The function to close the valve is realized. By adopting such a configuration, it is possible to obtain the same external shape as a gas shut-off valve that does not have an earthquake detection function that has been used conventionally, and a gas shut-off valve that is built into an existing gas appliance, Can be compatible. According to the gas shut-off valve described above, an earthquake detection function can be imparted to an existing gas apparatus incorporating a gas shut-off valve that does not have an earthquake detection function only by replacing parts.

  In the gas shut-off valve, the conductive member constitutes a part of an energization path to the coil, and the contact member moves against the bias by the contact bias member, so that the coil It is preferable that the energization path is cut off and the energization to the coil is interrupted.

  According to the gas shut-off valve, it is possible to quickly and surely cut off the energization of the coil when an earthquake occurs with a simple configuration without interposing a complicated control circuit or a microcomputer. It is possible to prevent malfunction of the gas shut-off valve due to malfunction of the control system.

  The present invention can also be embodied as a motor safety valve incorporating the gas shut-off valve.

  In the gas shut-off valve, it is preferable that the conductive member is a terminal of the coil and the weight member is the core.

  In the gas shut-off valve described above, the core and the coil that are also used in the gas shut-off valve that does not have the earthquake detection function are combined as a conductive member and a weight member for realizing the earthquake detection function. According to said gas cutoff valve, an earthquake detection function can be provided to a gas cutoff valve, suppressing the increase in a number of parts.

  Alternatively, in the gas shut-off valve, the conductive member is provided separately from the energization path to the coil, and the contact member moves against the urging by the contact urging member, so that the coil It is preferable that a short circuit is formed in the energization path to and the energization to the coil is interrupted.

  Even with the gas shut-off valve described above, it is possible to quickly and surely cut off the energization of the coil when an earthquake occurs with a simple configuration without interposing a complicated control circuit or a microcomputer. It is possible to prevent malfunction of the gas shut-off valve due to malfunction of the control system.

  According to the gas shut-off valve of the present invention, an earthquake detection function can be imparted to an existing gas apparatus incorporating a gas shut-off valve that does not have an earthquake detection function only by replacing parts.

It is a longitudinal cross-sectional view which shows the structure at the time of valve closing of the valve case 4 incorporating the gas cutoff valve 2 of Example 1. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of valve closing of the gas cutoff valve 2 of Example 1. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of ignition of the valve case 4 incorporating the gas cutoff valve 2 of Example 1. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of combustion of the valve case 4 incorporating the gas cutoff valve 2 of Example 1. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of fire extinguishing by the earthquake detection of the valve case 4 incorporating the gas cutoff valve 2 of Example 1. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of valve closing of the valve case 4 incorporating the gas cutoff valve 60 of Example 2. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of valve closing of the gas cutoff valve 60 of Example 2. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of fire extinguishing by the earthquake detection of the gas cutoff valve 60 of Example 2. FIG. It is a longitudinal cross-sectional view which shows the structure at the time of valve closing of the motor safety valve 100 of Example 3. FIG. FIG. 6 is a longitudinal sectional view showing a configuration during a preparatory operation for ignition of a motor safety valve 100 according to a third embodiment. FIG. 6 is a longitudinal sectional view showing a configuration of a motor safety valve 100 of Example 3 during combustion. It is a longitudinal cross-sectional view which shows the structure at the time of fire extinguishing by the earthquake detection of the motor safety valve 100 of Example 3. FIG.

Example 1
A gas cutoff valve 2 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the gas shut-off valve 2 of the present embodiment is used by being incorporated in a valve case 4 that forms a gas supply path of a gas stove. The valve case 4 includes an inlet 6 for receiving gas, an outlet 8 for sending out gas, and a first valve port 10 and a second valve port 12 provided between the inlet 6 and the outlet 8. In addition to the gas cutoff valve 2, a gas source valve 14 is incorporated in the valve case 4. The first valve port 10 of the valve case 4 is sealed by the valve body 16 of the gas cutoff valve 2. The second valve port 12 of the valve case 4 is sealed by the valve body 18 of the gas source valve 14. When the valve body 16 of the gas shut-off valve 2 is separated from the first valve port 10 and the valve body 18 of the gas source valve 14 is separated from the second valve port 12, the inlet 6 and the outlet 8 communicate with each other, and the gas Gas flows in the supply path.

  As shown in FIG. 2, the gas cutoff valve 2 includes a valve body 16, a bracket 20, and a first spring 22 provided between the bracket 20 and the valve body 16. The first spring 22 biases the valve body 16 toward the first valve port 10 (toward the right side in FIG. 2). An armature 28 is fixed to the valve body 16 via a rod 26 that passes through the opening 24 of the bracket 20. The armature 28 is made of a magnetic material and is disposed inside the bracket 20. The valve body 16 and the armature 28 move integrally in the left-right direction in FIG. 2 using the opening 24 and the rod 26 of the bracket 20 as a guide.

  A coil assembly 30 is accommodated in the bracket 20. The coil assembly 30 includes a coil 32 wound in a cylindrical shape and a core 34 accommodated in the coil 32. The coil assembly 30 is disposed so that the core 34 faces the armature 28. When the coil 32 is energized with the armature 28 in contact with the core 34, the core 34 is magnetized to attract the armature 28. The coil assembly 30 is pressed against the holder 38 by the second spring 36.

  The holder 38 is made of a conductive material. A first electrode pin 40 is disposed inside the holder 38. The first electrode pin 40 is fixed to the holder 38 via spacers 37a, 37b, 37c, 37d made of an insulating material and an O-ring 39. In a state where the coil assembly 30 is in contact with the holder 38, one terminal 32 a of the coil 32 is electrically connected to the first electrode pin 40, and the other terminal 32 b of the coil 32 is electrically connected to the holder 38.

  The holder 38 is fixed to a resin terminal cover 44 via a conductive washer 42. The washer 42 is electrically connected to the second electrode pin 46.

  The terminal cover 44 covers the periphery of the first electrode pin 40 and the second electrode pin 46. The 1st electrode pin 40 is connected to the thermocouple which detects the flame of the burner of a gas stove. The second electrode pin 46 is grounded.

  The gas source valve 14 shown in FIG. 1 includes a valve body 18, a push rod 50, and a third spring 52. The valve body 18 is biased by the third spring 52 toward the second valve port 12 (toward the right side in FIG. 1). The push rod 50 is fixed to the valve body 18 and moves integrally with the valve body 18 in the left-right direction of FIG.

  The valve body 18 is in contact with a push rod 54 that is linked to the ignition / extinguishing switch of the gas stove. When the burner is ignited, the user pushes the ignition / fire extinguishing switch so that the tip of the push rod 54 moves to the ignition position. The ignition / fire extinguishing switch is an alternate type, and even if the user releases the ignition / extinguishing switch after ignition of the burner, the tip of the push rod 54 stops at the valve open position. Thereafter, when the user presses the ignition / fire extinguishing switch, the tip of the push rod 54 moves to the valve closing position and stops.

  Hereinafter, the normal operation will be described. When the user pushes the ignition / fire extinguishing switch with both the gas shut-off valve 2 and the gas main valve 14 closed, as shown in FIG. 3, the tip of the push rod 54 is pushed to the ignition position, The valve body 18 of the gas source valve 14 moves to the left in FIG. 3 against the urging force of the third spring 52, and the second valve port 12 is opened. Further, the push rod 50 abuts against and pushes against the valve body 16 of the gas cutoff valve 2, so that the valve body 16 of the gas cutoff valve 2 moves to the left side in FIG. 3 against the biasing force of the first spring 22. The first valve port 10 is opened. Further, the armature 28 comes into contact with the core 34.

  When both the first valve port 10 and the second valve port 12 are opened, gas flows from the inlet 6 to the outlet 8. When the burner is ignited by the igniter in this state, the burner starts burning. When the burner starts to burn, current flows from the first electrode pin 40 to the second electrode pin 46 by the electromotive force of the thermocouple, and the coil 32 of the coil assembly 30 is energized, and the armature 28 is adsorbed to the core 34 by magnetic force. The When the user releases the ignition / extinguishing switch, as shown in FIG. 4, the push rod 54 moves to the valve open position, and the urging force of the third spring 52 causes the valve element 18 of the gas source valve 14 and the push rod to move. 50 also moves following the push rod 54, but the valve body 16 and the armature 28 of the gas cutoff valve 2 are held as they are by the magnetic force of the coil assembly 30.

  When the user pushes the ignition / extinguishing switch during combustion of the burner, the tip of the push rod 54 moves to the valve closing position, and the urging force of the third spring 52 causes the valve element 18 of the gas source valve 14 and the push rod 50 to move. Also moves following the push rod 54. The second valve port 12 is sealed by the valve body 18, and the gas flow in the gas supply path is blocked. The burner extinguishes and the electromotive force of the thermocouple disappears. As a result, the coil assembly 30 is no longer energized, and the attractive force between the armature 28 and the core 34 disappears. The valve body 16 and the armature 28 are moved by the biasing force of the first spring 22, and the first valve port 10 is also sealed by the valve body 16. As shown in FIG. 1, both the gas cutoff valve 2 and the gas source valve 14 are returned to the closed state.

  The operation when the burner disappears for some reason during burner combustion will be described below. As shown in FIG. 4, when the burner is extinguished while the burner is burning, the electromotive force of the thermocouple is lost by extinguishing the burner. As a result, the coil assembly 30 is no longer energized, and the attractive force between the armature 28 and the core 34 disappears. As shown in FIG. 5, the valve body 16 and the armature 28 are moved by the urging force of the first spring 22, and the first valve port 10 is sealed by the valve body 16. Thereby, the flow of the gas in the gas supply path is interrupted. Thereafter, the user pushes the ignition / fire extinguishing switch to close the gas main valve 14 so that both the gas cutoff valve 2 and the gas main valve 14 are closed as shown in FIG. Return.

  The operation when an earthquake occurs during burner combustion will be described below. When an earthquake occurs with the burner shown in FIG. 4 burning, the coil assembly 30 vibrates against the urging force of the second spring 36, and the coil assembly 30 moves away from the holder 38. Thereby, the continuity between one terminal 32a of the coil 32 and the first electrode pin 40 is interrupted, and further, the continuity between the other terminal 32b of the coil 32 and the holder 38 is interrupted. The coil 32 of the coil assembly 30 is not energized, and the attractive force between the armature 28 and the core 34 disappears. After that, even if the coil assembly 30 abuts against the holder 38 again by the urging force of the second spring 36, the armature 28 is already separated from the core 34 by the urging force of the first spring 22, so that the adsorbing force therebetween Does not work. As shown in FIG. 5, the valve body 16 and the armature 28 are moved by the urging force of the first spring 22, and the first valve port 10 is sealed by the valve body 16. The gas flow in the gas supply path is shut off and the burner is extinguished. After the earthquake has stopped, the user presses the ignition / fire extinguishing switch to close the gas main valve 14 so that both the gas cutoff valve 2 and the gas main valve 14 are closed as shown in FIG. Return to the valved state.

  In the gas shut-off valve 2 of this embodiment, the coil assembly 30 is pressed against the holder 38 by the biasing force of the second spring 36 without completely fixing the coil assembly 30 to the holder 38, thereby energizing the coil 32. The route is secured. With such a configuration, when an earthquake occurs, the coil assembly 30 vibrates and separates from the holder 38, the energization path to the coil 32 is cut, and the energization to the coil 32 is cut off. The gas shut-off valve 2 can be closed quickly and reliably when an earthquake occurs.

  The coil assembly 30 includes a coil 32 and a core 34, and originally has a certain weight. According to the gas shut-off valve 2 of the present embodiment, the occurrence of an earthquake can be detected and closed without separately providing a weight for detecting the earthquake.

  According to the gas shutoff valve 2 of the present embodiment, all mechanisms for detecting earthquakes are accommodated in the valve case 4. With such a configuration, it is possible to prevent a decrease in the earthquake detection function due to adhesion of water or dirt.

  The gas shut-off valve 2 of the present embodiment has the same external shape as a gas shut-off valve that does not have an earthquake detection function that has been used conventionally, and has compatibility when replacing parts. Yes. An earthquake detection function can be given to existing gas equipment that does not have an earthquake detection function only by replacing parts.

  In the above description, the case where the gas shut-off valve 2 is incorporated in the gas stove configured such that the electromotive force of the thermocouple is directly supplied to the first electrode pin 40 and the coil 32 of the coil assembly 30 is energized has been described as an example. Unlike this, even if the gas cutoff valve 2 is incorporated into a gas stove configured such that a signal from the thermocouple is once input to the control board and the coil 32 of the coil assembly 30 is energized from the control board via the first electrode pin 40. good.

(Example 2)
Hereinafter, the gas cutoff valve 60 of this embodiment will be described with reference to FIGS. As shown in FIG. 6, the gas shutoff valve 60 of the present embodiment is used by being incorporated in the valve case 4 together with the gas source valve 14, similarly to the gas shutoff valve 2 of the first embodiment. Hereinafter, differences from the gas cutoff valve 2 of the first embodiment will be described.

  As shown in FIG. 7, in the gas cutoff valve 60 of the present embodiment, the coil assembly 30 is always fixed to the holder 38, and the gas cutoff valve 60 does not include the second spring 36. One terminal 32 a of the coil 32 is always connected to the first electrode pin 40, and the other terminal 32 b of the coil 32 is always connected to the holder 38.

  The gas cutoff valve 60 includes a short plate 62, a weight 64, and a fourth spring 66 in the terminal cover 44. The short plate 62 is made of a conductive material. The short plate 62 is slidable with respect to the first electrode pin 40. The weight 64 is fixed to the short plate 62. The fourth spring 66 urges the short plate 62 in a direction away from the holder 38. An engagement claw 68 is formed in the terminal cover 44, and the short plate 62 biased by the fourth spring 66 is engaged with the engagement claw 68.

  Since the operation of the gas shut-off valve 60 during normal operation is the same as that of the gas shut-off valve 2 of the first embodiment, the description thereof is omitted.

  The operation when an earthquake occurs during burner combustion will be described below. When an earthquake occurs during combustion of the burner, the weight 64 and the short plate 62 vibrate against the urging force of the fourth spring 66, and the short plate 62 comes into contact with the holder 38 as shown in FIG. As a result, a short circuit is formed between the first electrode pin 40 and the holder 38, and energization to the coil 32 of the coil assembly 30 is cut off. The adsorption force between the armature 28 and the core 34 disappears, and the valve body 16 and the armature 28 move to the right in FIG. 8 by the urging force of the first spring 22. Thereafter, even if the short plate 62 is separated from the holder 38 by the urging force of the fourth spring 66, the armature 28 is already separated from the core 34, and no attracting force acts between them. As a result, the valve body 16 and the armature 28 are moved by the biasing force of the first spring 22, and the first valve port 10 is sealed by the valve body 16. The gas flow in the gas supply path is shut off and the burner is extinguished. After the earthquake has stopped, the user presses the ignition / fire extinguishing switch to close the gas main valve 14, thereby closing both the gas cutoff valve 60 and the gas main valve 14, as shown in FIG. Return to the valved state.

  According to the gas shutoff valve 60 of the present embodiment, the earthquake detection function is realized by disposing the short plate 62, the weight 64 and the fourth spring 66 in the excess space in the terminal cover 44. The gas shut-off valve 60 of the present embodiment also has the same outer shape as the gas shut-off valve that does not have an earthquake detection function that has been used conventionally, like the gas shut-off valve 2 of the first embodiment. Compatible when replacing parts. An earthquake detection function can be given to existing gas equipment that does not have an earthquake detection function only by replacing parts.

(Example 3)
Hereinafter, the motor safety valve 100 of the present embodiment will be described with reference to FIGS. 9 to 12. As will be described later, the motor safety valve 100 incorporates a function as a gas cutoff valve.

  As shown in FIG. 9, the motor safety valve 100 is incorporated and used in a valve case 102 that forms a gas supply path of a gas stove. The valve case 102 includes an inlet 104 for receiving gas and an outlet 106 for sending out the gas. A valve seat 108 is formed at the outflow port 106, and the outflow port 106 is sealed by the valve body 110 contacting the valve seat 108.

  A cover 112 that hermetically seals the inside with a seal 111 is attached to the valve case 102, and a stepping motor 114 is provided on the cover 112. A through hole 115 is formed in the cover 112, and the output shaft 116 of the stepping motor 114 is disposed inside the through hole 115. The output shaft 116 is a cylindrical member, and an internal thread is cut on the inner surface. The output shaft 116 is screwed with a feed screw 118 having a male thread on the outer surface. A holder 122 is coupled to the end of the feed screw 118 by a pin 120. A coil assembly 124 is attached to the holder 122. The coil assembly 124 includes a bifurcated core 126 and a coil 130 wound around a bobbin portion 128 attached to one side of the core 126.

  The holder 122 is fixed to the mold 132. A bracket 134 is fixed to the mold 132. Fins 136 are formed outside the bracket 134. The feed screw 118, the pin 120, the holder 122, the coil assembly 124, the mold 132, the bracket 134, and the fin 136 constitute a movable body 137 that moves as a whole. The fin 136 serves as a detent with respect to the inner surface of the valve case 102, and the rotation of the movable body 137 is restrained. Therefore, when the stepping motor 114 rotates the output shaft 116, the movable body 137 moves in the vertical direction in FIG. When the stepping motor 114 rotates in the forward direction, the movable body 137 moves upward in FIG. When the stepping motor 114 rotates in the reverse direction, the movable body 137 moves downward in FIG.

  The bracket 134 has an opening 138, and the rod 140 is inserted into the opening 138. The valve body 110 is connected to one end of the rod 140 (the lower end in FIG. 9). The valve body 110 is connected to the rod 140 by a latch 139 and a first spring 141, and the valve body 110 can tilt with respect to the rod 140. Therefore, even if the movable body 137 is inclined, it is possible to prevent the valve body 110 from being in contact with the valve seat 108. An armature 144 is connected to the other end of the rod 140 (upward end in FIG. 9) via a pin 142. Since the armature 144 is connected to the rod 140 so as to be tiltable, even if the movable body 137 is tilted, the core 126 and the armature 144 can be prevented from coming into contact with each other.

  A second spring 145 is disposed between the valve body 110 and the bracket 134. The second spring 145 urges the valve body 110 toward the valve seat 108.

  The coil 130 of the coil assembly 124 is energized through a two-pole connector 146. The connector 146 is electrically connected to the movable conductive plate 150 via a flexible FPC cable 148. A weight 152 is attached to one end of the movable conductive plate 150. A through hole is formed at the other end of the movable conductive plate 150, and an insulating support column 154 extending from the cover 112 is inserted through the through hole. A fixed conductive plate 160 is fixed to the base of the support column 154. A support plate 156 is fixed to the tip of the support column 154, and a third spring 158 is disposed between the support plate 156 and the movable conductive plate 150. The movable conductive plate 150 is pressed against the fixed conductive plate 160 by the third spring 158. The fixed conductive plate 160 is energized from an external controller.

  Hereinafter, the normal operation will be described. When the user presses the ignition / extinguish switch on the gas stove, the controller rotates the stepping motor 114 in the reverse direction. As a result, as shown in FIG. 10, the movable body 137 moves downward in FIG. 10 against the urging force of the second spring 145, and the core 126 contacts the armature 144. In this state, when the controller energizes the coil 130, the armature 144 is attracted to the core 126. Next, when the controller rotates the stepping motor 114 in the forward direction, the valve body 110 is separated from the valve seat 108 as shown in FIG. 11, and the inflow port 104 and the outflow port 106 communicate with each other. The burner is ignited by the igniter, and the burner starts to burn.

  If the user presses and operates the ignition / extinguishing switch while the burner is burning, the controller stops energizing the coil 130. The valve body 110 seals the valve seat 108 by the urging force of the second spring 145, and the communication between the inlet 104 and the outlet 106 is blocked. The motor safety valve 100 is closed.

  If the burner disappears for some reason during the burner combustion, the controller stops energization of the coil 130 according to the change in the output from the thermocouple that detects the burner flame, and the motor safety valve 100 is closed. To do.

  The operation when an earthquake occurs during burner combustion will be described below. When an earthquake occurs with the burner shown in FIG. 11 burning, the movable conductive plate 150 and the weight 152 vibrate against the urging force of the third spring 158 as shown in FIG. Is separated from the fixed conductive plate 160. As a result, the power supply to the coil 130 is interrupted, and the attractive force between the armature 144 and the core 126 disappears. Thereafter, even if the movable conductive plate 150 abuts against the fixed conductive plate 160 again by the urging force of the third spring 158, the armature 144 is already separated from the core 126 by the urging force of the second spring 145. Adsorption force does not act on. The valve body 110 and the armature 144 are moved by the biasing force of the second spring 145, and the valve body 110 seals the valve seat 108. The communication between the inflow port 104 and the outflow port 106 is blocked, and the motor safety valve 100 is closed.

  In the motor safety valve 100 of the present embodiment, the movable conductive plate 150 including the weight 152 is provided in the energization path to the coil 130, and the movable conductive plate 150 is pressed against the fixed conductive plate 160 by the urging force of the third spring 158. The coil 130 is configured to ensure energization. With such a configuration, when an earthquake occurs, the movable conductive plate 150 vibrates and separates from the fixed conductive plate 160, the energization path to the coil 130 is cut, and the energization to the coil 130 is cut off. The motor safety valve 100 can be quickly and reliably closed when an earthquake occurs.

  In the motor safety valve 100 of the present embodiment, the energization to the coil 130 can be interrupted when an earthquake occurs without interposing a complicated control circuit, microcomputer, or the like. It is possible to prevent malfunction of the gas shut-off valve due to malfunction of the control system.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2 Gas shutoff valve; 4 Valve case; 6 Inlet; 8 Outlet; 10 1st valve port; 12 2nd valve port; 14 Gas source valve; 16 Valve body; 18 Valve body; 20 Bracket; 22 First spring; 24 Opening; 26 Rod; 28 Armature; 30 Coil Assy; 32 Coil; 32a Terminal; 32b Terminal; 34 Core; 36 Second Spring; 37a, 37b, 37c, 37d Spacer; 38 Holder; 39 O-ring; 40 First Electrode 44 terminal cover; 46 second electrode pin; 50 push rod; 52 third spring; 54 push rod; 60 gas shutoff valve; 62 short plate; 64 weight; 66 fourth spring; 68 engaging claw; 100 Motor safety valve; 102 Valve case; 104 Inlet; 106 Outlet; 108 Valve seat; 110 Valve body; 111 Seal 112 Cover; 114 Stepping motor; 115 Through hole; 116 Output shaft; 118 Feed screw; 120 Pin; 122 Holder; 124 Coil assembly; 126 Core; 128 Bobbin part; 130 Coil; 132 Mold; 134 Bracket; 138 Opening; 139 Latch; 140 Rod; 141 First Spring; 142 Pin; 144 Armature; Second Spring 145; 146 Connector; 148 FPC Cable; 150 Movable Conductive Plate; 152 Weight; 154 Support Column; 156 Support Plate; 158 Third spring; 160 Fixed conductive plate

Claims (5)

A valve body, a valve body urging member that urges the valve body toward the valve opening, an armature that moves integrally with the valve body, and when the armature is magnetized in contact with the armature, the armature A gas cutoff valve comprising a core to be adsorbed and a coil for magnetizing the core by energization,
A contact member disposed in an energization path to the coil in the gas shutoff valve, and a contact biasing member that biases the contact member;
The contact member includes a conductive member and a weight member,
Energization to the coil is ensured by the contact urging member urging the contact member,
A gas shut-off valve characterized in that when the earthquake occurs, the contact member vibrates and the contact member moves against the urging force of the contact urging member to cut off the energization of the coil. . The conductive member constitutes a part of an energization path to the coil;
The energization path to the coil is cut off and the energization to the coil is cut off by the contact member moving against the energization by the contact energizing member. Gas shut-off valve.   2. The gas cutoff valve according to claim 1, wherein the conductive member is a terminal of the coil, and the weight member is the core. The conductive member is provided separately from the energization path to the coil,
The contact member is moved against the urging force by the contact urging member, whereby a short circuit is formed in the energization path to the coil, and the energization to the coil is cut off. Item 1. A gas shut-off valve according to Item 1.   A motor safety valve incorporating the gas cutoff valve according to claim 1 or 2.

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