JP2020060332A - Electric gas valve device - Google Patents

Abstract

To prevent misfire caused by expansion of a volume of a secondary side gas chamber 12 and a decline in gas pressure when rotation of a motor 4 to a second rotating position causes a valve seat member 7 to move, in a gas valve device that includes a flow control valve 3 having a valve element 32 moved in cooperation with an operation rod 6 driven axially by the motor 4 and a solenoid safety valve 2 pressed and opened via the valve seat member 7 axially movable by the valve element 32 and that rotates the motor 4 to the second rotating position beyond a first rotating position where the valve element 32 abuts on the valve seat member 7 held by energizing force of a valve seat spring 72 at a backward end position for restraint by a valve seat stopper 71 during restriction to minimum thermal power.SOLUTION: A diaphragm 14 facing a secondary side gas chamber 12 is provided to define a back pressure chamber 15 partitioned from the secondary side gas chamber 12 by the diaphragm 14. The back pressure chamber 15 and the secondary side gas chamber 12 are communicated with each other via a ventilation passage 16 having a restriction effect.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric gas valve device provided in a gas supply path to a burner.

  Conventionally, as this type of electric gas valve device, an electromagnetic safety valve, a flow rate control valve, an operation rod axially driven by an electric motor through an interlocking mechanism, and a space in the valve casing are provided in the valve casing. It is known that a valve seat member that is movable in the axial direction and is partitioned into one primary side gas chamber in the axial direction and the other secondary side gas chamber in the axial direction is provided (see, for example, Patent Document 1). Here, with one axial direction as the forward direction and the other axial direction as the return direction, the electromagnetic safety valve has a safety valve valve seat facing the primary side gas chamber provided in the valve seat member and a safety valve valve seat facing the safety valve valve seat. Valve valve for a safety valve, a valve spring for biasing the valve element for a safety valve in a backward direction to seat it on a valve seat for a safety valve, and an adsorption piece connected to the valve element for a safety valve via a valve shaft extending in a forward direction. And an electromagnet facing the adsorption piece, and the flow rate control valve moves in the axial direction integrally with the control valve valve seat facing the secondary side gas chamber provided in the valve seat member and the operation rod. And a valve body for a control valve which can be seated on a valve seat for the control valve. Further, in the valve casing, a valve seat stopper that stops movement of the valve seat member in the backward direction at a predetermined backward end position and a valve seat spring that biases the valve seat member in the backward direction are provided. ing.

  In the above-mentioned conventional example, by rotating the electric motor in the forward direction to move the operating rod in the forward direction, the valve body for the control valve is seated on the valve seat for the control valve, and the valve seat member is moved forward from the return end position. The safety valve seat against the valve element for the safety valve, and pushes the valve element for the safety valve against the biasing force of the valve spring to the valve opening position where the adsorption piece contacts the electromagnet. By energizing the electromagnet in this state, the safety valve valve element is adsorbed and held in the valve open position. After that, by rotating the electric motor in the reverse direction to move the operating rod in the backward direction, the valve seat member is moved in the backward direction, and the safety valve valve seat is separated from the safety valve valve element that is adsorbed and held at the valve opening position. Then, the electromagnetic safety valve is opened, and the valve body for the control valve moves away from the valve seat for the control valve due to the further movement of the operation rod in the backward direction after the valve seat member reaches the return end position. The amount of gas supplied to the burner is gradually increasing.

  Further, the flow rate control valve has a bypass passage through which gas flows from the primary side gas chamber to the secondary side gas chamber even when the control valve valve body is seated on the control valve valve seat. Here, when the gas supply amount to the burner is reduced to the minimum amount specified by the bypass passage during burner combustion, the electric motor is used as the control valve for the control valve seat of the valve seat member at the return end position. If the valve is stopped at the rotation position where the valve seat is seated, the electric motor must be installed before the valve seat for the control valve is seated on the valve seat for the control valve due to the dimensional tolerance of the valve seat member and the position tolerance of the valve seat stopper. May stop and the amount of gas supplied to the burner may not be reduced to the minimum amount defined by the bypass passage. Therefore, conventionally, when the gas supply amount to the burner is reduced to the minimum amount specified by the bypass path during burner combustion, the electric motor is adjusted to the control valve valve seat of the valve seat member at the return end position. The valve body is normally rotated to a second rotational position that is deviated by a predetermined angle in the normal rotational direction from the first rotational position at which the valve body is seated.

  However, this causes the following problems. That is, in the conventional example, when the electric motor is normally rotated to the second rotation position, the valve body for the control valve is further seated on the valve seat for the control valve of the valve seat member located at the return end position and then further moved. It moves in the moving direction, and the valve seat member is pushed by the adjusting valve body and moves in the forward moving direction. This movement expands the volume of the secondary gas chamber, temporarily lowers the gas pressure in the secondary gas chamber, and undershoots the amount of gas supplied to the burner to temporarily fall below the minimum amount. However, it may cause a misfire.

JP, 2018-13251, A

  In view of the above points, an object of the present invention is to provide an electric gas valve device capable of preventing misfire when the gas supply amount to the burner is reduced to the minimum amount during burner combustion.

  In order to solve the above problems, the present invention is an electric gas valve device provided in a gas supply path to a burner, wherein an electromagnetic safety valve, a flow rate control valve, and an electric motor work together in a valve casing. A valve seat member that is axially movable via a mechanism and an axially movable valve seat member that divides the space inside the valve casing into one primary side gas chamber in the axial direction and the other secondary side gas chamber in the axial direction. The electromagnetic safety valve includes a safety valve valve seat facing the primary side gas chamber provided in the valve seat member, and a safety valve valve seat with one axial direction being the forward direction and the other axial direction being the return direction. Connected to the safety valve valve body, a valve spring that biases the safety valve valve element in the backward direction to seat it on the safety valve valve seat, and a valve shaft that extends in the forward direction to the safety valve valve element. The flow control valve includes an adsorption piece and an electromagnet facing the adsorption piece. Valve seat for the control valve facing the secondary side gas chamber provided in the member, a valve body for the control valve that can be seated on the valve seat for the control valve that moves in the axial direction integrally with the operating rod, and for the control valve A bypass passage that allows gas to flow from the primary gas chamber to the secondary gas chamber even when the valve body for the control valve is seated on the valve seat is provided, and the movement of the valve seat member in the backward direction is specified within the valve casing. Is provided with a valve seat stopper that stops at the return end position and a valve seat spring that urges the valve seat member in the return direction, and the electric motor is normally rotated to move the operation rod in the forward direction. , The control valve valve body is seated on the control valve valve seat, the valve seat member is pushed in the forward direction from the return end position, the safety valve valve seat is brought into contact with the safety valve valve body, and the safety valve The valve body is pushed against the urging force of the valve spring to the valve opening position where the adsorption piece contacts the electromagnet. The valve element for the safety valve is attracted and held in the valve opening position by turning on the electric power, and then the electric motor is rotated in the reverse direction to move the operating rod in the backward direction to move the valve seat member in the backward direction, thereby the safety valve The solenoid valve is opened by separating the valve seat from the valve element for the safety valve that is adsorbed and held in the valve opening position, and the valve seat member is further moved in the return direction of the operating rod after reaching the return end position. Of the control valve causes the valve body for the control valve to move away from the valve seat for the control valve so that the gas supply amount to the burner gradually increases. Further, the gas supply amount to the burner is defined by the bypass passage during burner combustion. When narrowing down to the minimum amount, the electric motor is rotated in the forward rotation direction more than the first rotation position, which is the rotation position where the valve body for the control valve is seated on the valve seat for the control valve of the valve seat member at the return end position. For those that rotate forward to a second rotational position that is offset by a predetermined angle In addition, a diaphragm facing the secondary gas chamber is provided, the diaphragm defines a back pressure chamber partitioned from the secondary gas chamber, and ventilation that connects the secondary gas chamber and the back pressure chamber is established. A passage is provided, and this ventilation passage has a ventilation resistance such that the gas pressure in the back pressure chamber changes with a response delay after the gas pressure in the secondary gas chamber changes.

  According to the present invention, when the electric motor rotates in the normal direction beyond the first rotation position, the volume of the secondary side gas chamber is increased due to the movement of the valve seat member from the backward movement end position in the forward movement direction. Even if the gas pressure in the secondary-side gas chamber (secondary gas pressure) decreases, the gas pressure in the back-pressure chamber does not immediately decrease from the previous secondary gas pressure due to the ventilation resistance of the ventilation passage. Due to the pressure difference between the gas pressure inside the chamber and the gas pressure inside the secondary gas chamber, the diaphragm is displaced in the direction of reducing the volume of the secondary gas chamber. Therefore, even if the valve seat member moves in the forward direction from the backward movement end position, the volume of the secondary gas chamber does not increase to the left. As a result, when the electric motor is normally rotated beyond the first rotation position to the second rotation position during burner combustion to reduce the gas supply amount to the burner to the minimum amount, the volume of the secondary gas chamber is reduced. It is possible to suppress the undershoot of the gas supply amount below the minimum amount due to the expansion and prevent misfire.

  When the diaphragm is displaced in the direction of reducing the volume of the secondary gas chamber, the volume of the back pressure chamber is increased, the gas pressure in the back pressure chamber is reduced, and the displacement of the diaphragm in the above direction is suppressed. However, there is a possibility that the volume expansion of the secondary gas chamber cannot be sufficiently prevented. Therefore, in the present invention, the diaphragm is arranged so as to face the end portion of the secondary side gas chamber on the backward movement side, the valve seat member is connected to the diaphragm, and the diaphragm is axially formed together with the valve seat member. It is desirable to shift to. According to this, when the valve seat member moves in the forward direction from the return end position, the diaphragm is displaced together with the valve seat member in the forward direction, that is, in the direction in which the volume of the secondary gas chamber is reduced. However, it is possible to reliably prevent the volume of the secondary gas chamber from increasing. Therefore, the reliability of misfire prevention when the gas supply amount to the burner is reduced to the minimum amount is improved.

  By the way, it is possible to provide the ventilation passage in the valve casing, but this increases the processing cost of the ventilation passage. Therefore, in the present invention, it is desirable that the ventilation passage be composed of an orifice hole formed in the diaphragm. According to this, the processing cost of the ventilation path is almost non-existent, and the cost can be reduced.

The cutting side view of the electric type gas valve device of a 1st embodiment of the present invention. FIG. 3 is an exploded perspective view of an interlocking mechanism provided in the electric gas valve device according to the first embodiment. (A) (b) (c) Sectional side view of the principal part which shows operation | movement of the electrically driven gas valve apparatus of 1st Embodiment. The cutting side view of the electric type gas valve device of a 2nd embodiment of the present invention. FIG. 9 is a cutaway side view of a main part of the electric gas valve device according to the second embodiment when the electric motor is normally rotated to a second rotation position.

  With reference to FIG. 1, A is an electric gas valve device according to an embodiment of the present invention, which is provided in a gas supply path G to a burner B provided on a stove. The gas valve device A includes a valve casing 1 having a gas inlet 1a and a gas outlet 1b connected to the burner B. Inside the valve casing 1, an electromagnetic safety valve 2, a flow rate control valve 3, an operating rod 6 axially driven by an electric motor 4 such as a stepping motor via an interlocking mechanism 5, and an inside of the valve casing 1. An axially movable valve seat member 7 for partitioning the space into one axial side primary gas chamber 11 communicating with the gas inlet 1a and the other axial secondary side gas chamber 12 communicating with the gas outlet 1b; Is provided. The electric motor 4 is mounted on the outer end of a box 13 attached to the other end of the valve casing 1 in the axial direction so as to surround the interlocking mechanism 5.

  With one axial direction as the forward direction and the other axial direction as the return direction, the electromagnetic safety valve 2 has a safety valve valve seat 21 facing the primary side gas chamber 11 provided in the valve seat member 7 and a safety valve valve seat 21. The valve body 22 for the safety valve, the valve spring 23 for biasing the valve body 22 for the safety valve in the backward direction to seat it on the valve seat 21 for the safety valve, and the valve shaft extending in the forward direction for the valve body 22 for the safety valve. An adsorption piece 24 connected via 22 a and an electromagnet 25 facing the adsorption piece 24 are provided. Then, the safety valve valve body 22 opens by energizing the electromagnet 25 while pushing the safety valve valve body 22 against the valve spring 23 to a valve opening position where the adsorption piece 24 contacts the electromagnet 25. It is designed to be held by suction at a position. When a misfire is detected by a flame detection element (not shown) attached to the burner B, or when a fire extinguishing operation is performed by pushing a point fire extinguisher button 9 described later into a fire extinguishing position, the energization of the electromagnet 25 is stopped, The valve body 23 for the safety valve is returned by the valve spring 23 to the closed position where it is seated on the valve seat 21 for the safety valve, and the electromagnetic safety valve 2 is closed.

  A cylindrical protrusion formed on the inner surface of the valve casing 1 for stopping the movement of the valve seat member 7 in the backward movement direction at a predetermined backward movement end position where the safety valve element 22 can be seated. A valve seat stopper 71 and a valve seat spring 72 that biases the valve seat member 7 in the backward movement direction to elastically hold the valve seat member 7 in the backward movement end position. The valve seat member 7 is provided with a plurality of leg portions 7a projecting in a backward direction from a peripheral portion of a valve seat 31 for adjusting valve, which will be described later. Abut on the seat stopper 71. Further, a bellows diaphragm 73 is provided outside the valve seat member 7 to prevent gas from flowing between the primary side gas chamber 11 and the secondary side gas chamber 12.

  The flow rate control valve 3 includes a control valve valve seat 31 facing the secondary gas chamber 12 provided in the valve seat member 7, and a control valve valve body 32 that moves axially integrally with the operation rod 6. I have it. The valve body 32 for the control valve is inserted into the valve hole 31a from the return direction, and a closing valve portion 32a which can be seated on the valve seat 31 for the control valve so as to close the valve hole 31a opened in the valve seat 31 for the control valve. And a possible needle portion 32b. Further, the flow rate control valve 3 includes a bypass passage 33 that allows gas to flow from the primary side gas chamber 11 to the secondary side gas chamber 12 even when the closing valve portion 32a is seated on the control valve valve seat 31. In the present embodiment, the bypass passage 33 is formed in the control valve valve body 32, but it is also possible to form the bypass passage 33 in the valve seat member 7. Further, in the present embodiment, the control valve valve body 32 is integrally formed with the operation rod 6, but the control valve valve body 32 may be attached to the operation rod 6 separately from the operation rod 6. Good.

  Referring also to FIG. 2, the interlocking mechanism 5 engages with a cylindrical cam body 54 concentric with the operation rod 6 which is rotationally driven by the electric motor 4, and a spiral cam groove 54 a formed in the cam body 54. The operation rod 6 has a pin 55 fixed to the operation rod 6, and the operation rod 6 moves forward and backward by an axial thrust acting from the cam groove 54a via the pin 55 when the cam body 54 rotates forward and backward. The cam mechanism is configured to move in the direction. Between the electric motor 4 and the cam body 54, a reduction gear train 51 incorporated in the motor case, a rotation shaft 52 on the output side of the reduction gear train 51, and a connection for connecting the rotation shaft 52 and the cam body 54. A child 53 is provided. The connector 53 has a non-circular hole 53a that fits into the rotary shaft 52 having a non-circular cross section, and rotates together with the rotary shaft 52. Further, the connector 53 is provided with a projecting piece portion 53b that engages with a notch portion 54b formed at an end portion of the cam body 54 on the backward moving direction and transmits a rotational force. A guide cylinder 56 extending in the backward direction from the valve casing 1 is inserted into the cam body 54. The guide cylinder 56 is formed with an elongated hole 56a which is long in the axial direction, and the pin 55 is engaged with the elongated hole 56a so as to be slidable in the axial direction. Further, there is provided a cam spring 58 for biasing and holding the end of the cam body 54 in the forward direction in contact with the cam stopper 57 constituted by the end wall of the box 13.

  Further, a controller 8 that controls the electric gas valve device A is provided. An operation signal from a fire extinguisher button 9 provided on the operation panel of the stove is input to the controller 8. The point fire extinguishing button 9 is a push-push type, and once pushed in from a fire extinguishing position that is substantially flush with the surface of the operation panel unit and then released by being pushed, it is displaced to an ignition position protruding from the surface of the operation panel unit. It can be rotated to adjust the heating power. Then, when an ignition operation is performed to cause the fire extinguisher button 9 to project to the ignition position, the controller 8 causes the electric motor 4 to normally rotate via the motor drive circuit 41. According to this, the operating rod 6 moves in the forward direction via the interlocking mechanism 5, and first, the closing valve portion 32a of the valve element 32 for the adjusting valve is at the return end position where it is stopped by the valve seat stopper 71. The valve seat member 7 is seated on the control valve valve seat 31, and thereafter the valve seat member 7 is pushed by the control valve valve body 32 to move in the forward direction. Then, the safety valve valve seat 21 comes into contact with the safety valve valve body 22, and the safety valve valve body 22 is pushed to the valve opening position (the state shown in FIG. 3A). In this state, the electromagnet 25 is energized to attract and hold the safety valve valve body 22 at the valve open position. After that, the electric motor 4 is rotated in the reverse direction to move the operation rod 6 in the backward movement direction and energize the igniter (not shown). At this time, the valve seat member 7 moves in the backward direction following the operation rod 6 to the backward end position, and the safety valve valve seat 21 moves away from the safety valve body 22 which is suction-held at the valve opening position. The electromagnetic safety valve 2 is opened, and the gas supply to the burner B is started. After that, the valve body 32 for control valve is further moved in the backward direction with respect to the valve seat member 7 which is stopped at the return end position, and the closing valve portion 32a is separated from the valve seat 31 for control valve to move to the burner B. The burner B is ignited by gradually increasing the gas supply amount. After the burner is ignited, the control valve valve body 32 moves in the forward direction, and the control valve valve body 32 (to be precise, the closing valve) is attached to the control valve valve seat 31 of the valve seat member 7 located at the return end position. When the portion 32a) is seated (state of FIG. 3B), gas flows only through the bypass passage 33, and the gas supply amount to the burner B becomes the minimum amount.

  However, if the electric motor 4 is stopped at the rotational position where the control valve valve body 32 is seated on the control valve valve seat 31 of the valve seat member 7 present at the backward movement end position, the valve seat member 7 may be stopped. Due to dimensional tolerances, positional tolerances of the valve seat stopper 71, etc., the electric motor 4 is stopped before the control valve valve body 32 is seated on the control valve valve seat 31, and the gas supply amount to the burner B is bypassed by the bypass passage 33. It may not be possible to narrow down to the minimum amount specified in. Therefore, when the thermal power indicated by the point extinguishing button 9 is changed to the minimum thermal power during burner combustion and the gas supply amount to the burner B is reduced to the minimum amount defined by the bypass passage 33, the electric motor 4 is Second rotation deviated by a predetermined angle in the forward rotation direction from the first rotation position, which is the rotation position where the control valve valve body 32 is seated on the control valve valve seat 31 of the valve seat member 7 located at the return end position. I try to rotate it to the normal position.

  However, when the electric motor 4 is normally rotated from the first rotation position to the second rotation position, the valve seat member 7 is pushed by the control valve valve body 32 and moves in the forward direction from the backward movement end position. Then, the volume of the secondary side gas chamber 12 increases, the gas pressure in the secondary side gas chamber 12 temporarily decreases, and the gas supply amount to the burner B temporarily falls below the minimum amount. It may shoot and misfire.

  Therefore, in this embodiment, the diaphragm 14 facing the secondary gas chamber 12 is provided, and the diaphragm 14 defines the back pressure chamber 15 partitioned from the secondary gas chamber 12. Specifically, the diaphragm 14 is disposed so as to face the end portion of the secondary side gas chamber 12 on the backward movement side, and the inner peripheral edge portion 14 a of the diaphragm 14 is fitted onto the outer periphery of the end portion of the valve seat stopper 71. The back pressure chamber 15 is defined around the valve seat stopper 71. An inner peripheral edge portion 14a of the diaphragm 14 is pressed by a spring 141 provided between the diaphragm 14 and the valve seat member 7 so as not to come out of the valve seat stopper 71.

  Further, the secondary side gas chamber 12 and the back pressure chamber 15 are ventilated so that the gas pressure in the back pressure chamber 15 changes with a response delay after the gas pressure in the secondary side gas chamber 12 changes. They are communicated with each other via a ventilation passage 16 having resistance. It is possible to provide the ventilation passage 16 in the valve casing 1, but this increases the processing cost of the ventilation passage 16. Therefore, in the present embodiment, the ventilation passage 16 is composed of an orifice hole formed in the diaphragm 14. Specifically, the inner peripheral edge portion 14a of the diaphragm 14 is positioned at one position in the circumferential direction of the end surface of the inner peripheral edge portion 14a facing the backward movement direction, and the groove portion 14b communicating with the back pressure chamber 15 is formed. An air passage 16 formed of an orifice hole is formed so as to connect the groove portion 14b and the secondary gas chamber 12. If the ventilation passage 16 is formed in the diaphragm 14 as described above, the machining cost of the ventilation passage 16 is hardly required, and the cost can be reduced.

  According to the above configuration, when the electric motor 4 is normally rotated beyond the first rotation position to the second rotation position, the valve seat member 7 is moved from the return end position as shown in FIG. 3C. The gas pressure (secondary gas pressure) in the secondary gas chamber 12 decreases due to the movement in the forward direction and the accompanying increase in the volume of the secondary gas chamber 12. On the other hand, the gas pressure in the back pressure chamber 15 does not immediately decrease from the secondary gas pressure before the decrease due to the ventilation resistance of the ventilation passage 16. Therefore, due to the differential pressure between the gas pressure in the back pressure chamber 15 and the gas pressure in the secondary side gas chamber 12, the diaphragm 14 moves forward from the state shown by the phantom line in FIG. Direction, that is, a direction in which the volume of the secondary gas chamber 12 is reduced. Therefore, even if the valve seat member 7 moves in the forward movement direction from the backward movement end position, the volume of the secondary gas chamber 12 does not increase to the left. As a result, when the electric motor 4 is normally rotated beyond the first rotation position to the second rotation position during burner combustion and the gas supply amount to the burner B is reduced to the minimum amount, the secondary gas chamber It is possible to suppress the undershoot of the gas supply amount below the minimum amount due to the expansion of the volume of 12, and to prevent misfire.

  Next, a second embodiment shown in FIGS. 4 and 5 will be described. The basic structure of the second embodiment is not particularly different from that of the first embodiment, and the same members and parts as those in the first embodiment are designated by the same reference numerals.

  Here, in the first embodiment, when the diaphragm 14 is displaced in the direction of reducing the volume of the secondary side gas chamber 12 (forward direction), the volume of the back pressure chamber 15 increases and the back pressure chamber 15 increases. There is a possibility that the gas pressure in the inside will be reduced, the displacement of the diaphragm 14 in the forward movement direction will be suppressed, and the volume expansion of the secondary side gas chamber 12 cannot be sufficiently prevented. Therefore, in the second embodiment, the valve seat member 7 is connected to the diaphragm 14 that is arranged so as to face the end portion of the secondary side gas chamber 12 on the backward movement side, and the diaphragm 14 is connected to the valve seat member 7. It is designed to be displaced together in the axial direction. Specifically, the inner peripheral edge portion 14a of the diaphragm 14 is opposed to the end surface of the valve seat stopper 71, and the distal end portion of each leg portion 7a of the valve seat member 7 is inserted into and locked to the inner peripheral edge portion 14a to form the diaphragm. The valve seat member 7 is connected to 14.

  According to the second embodiment, when the electric motor 4 normally rotates beyond the first rotation position to the second rotation position and the valve seat member 7 moves from the backward movement end position in the forward movement direction, As shown in FIG. 5, the diaphragm 14 is displaced together with the valve seat member 7 in the forward direction, that is, in the direction in which the volume of the secondary gas chamber 12 is reduced, and the volume of the secondary gas chamber 12 is increased. It can be surely prevented. Therefore, the reliability of misfire prevention when the gas supply amount to the burner B is reduced to the minimum amount is improved.

  Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above-described first embodiment, the diaphragm 14 is arranged so as to face the end portion of the secondary side gas chamber 12 on the backward moving direction side, but it is arranged so as to partially cover the peripheral surface of the secondary side gas chamber 12. An opening is formed in the portion of the valve casing 1 that is formed, a diaphragm is arranged so as to cover this opening, and a diaphragm cover is arranged on the back side of the diaphragm, and a back pressure chamber is defined between the diaphragm and the diaphragm cover. It is also possible.

  Further, in the above-described embodiment, the interlocking mechanism 5 is configured by the cam mechanism having the tubular cam body 54, but the interlocking mechanism may be configured by the feed screw mechanism. Further, the electric motor may be arranged so as to be orthogonal to the valve casing in the axial direction, and the interlocking mechanism may be composed of a rack and pinion mechanism including a rack connected to the operation rod and a motor-driven pinion that meshes with the rack. It is possible. Further, the present invention can be similarly applied to an electric gas valve device provided in a gas supply path to a burner other than the burner for the stove.

  A ... Electric gas valve device, B ... Burner, G ... Gas supply passage, 1 ... Valve casing, 11 ... Primary side gas chamber, 12 ... Secondary side gas chamber, 14 ... Diaphragm, 15 ... Back pressure chamber, 16 ... Ventilation path (orifice hole), 2 ... Electromagnetic safety valve, 21 ... Safety valve valve seat, 22 ... Safety valve valve body, 22a ... Valve shaft, 23 ... Valve spring, 24 ... Adsorption piece, 25 ... Electromagnet, 3 ... Flow control valve , 31 ... Valve seat for control valve, 32 ... Valve body for control valve, 33 ... Bypass passage, 4 ... Electric motor, 5 ... Interlocking mechanism, 6 ... Operation rod, 7 ... Valve seat member, 71 ... Valve seat stopper, 72 … Valve seat spring.

Claims (3)

An electric gas valve device provided in a gas supply path to a burner, wherein an electromagnetic safety valve, a flow rate control valve, and an operation rod axially driven by an electric motor through an interlocking mechanism in a valve casing. And a valve seat member that is movable in the axial direction to partition the space in the valve casing into one primary side gas chamber in the axial direction and the other secondary side gas chamber in the axial direction. The electromagnetic safety valve includes a valve seat for a safety valve facing the primary gas chamber provided in the valve seat member, a valve body for the safety valve facing the valve seat for the safety valve, and a valve for the safety valve. A valve spring that urges the body in the backward direction to sit on the valve seat for the safety valve, an adsorption piece connected to the valve body for the safety valve via a valve shaft that extends in the forward direction, and an electromagnet that faces the adsorption piece. And the flow control valve faces the secondary gas chamber provided in the valve seat member. The valve seat for the control valve and the valve body for the control valve that moves in the axial direction together with the operating rod and can be seated on the valve seat for the control valve, and even when the valve body for the control valve is seated on the valve seat for the control valve A bypass passage for flowing gas from the primary gas chamber to the secondary gas chamber,
A valve seat stopper for stopping the movement of the valve seat member in the backward movement direction at a predetermined backward movement end position and a valve seat spring for urging the valve seat member in the backward movement direction are provided in the valve casing. By rotating the motor in the forward direction and moving the operating rod in the forward direction, the valve body for the control valve is seated on the valve seat for the control valve, and the valve seat member is pushed in the forward direction from the return end position. , The safety valve seat is brought into contact with the safety valve valve body, and the safety valve valve body is pushed against the biasing force of the valve spring to the valve opening position where the adsorption piece comes into contact with the electromagnet. By energizing, the valve element for the safety valve is adsorbed and held in the valve open position, and then the electric motor is rotated in the reverse direction to move the operating rod in the backward direction, so that the valve seat member is moved in the backward direction and the safety valve is used. Separate the valve seat from the valve body for the safety valve that is adsorbed and held in the open position, and When the valve seat is opened and the valve seat member reaches the return end position, the control rod valve element moves away from the control valve valve seat by the further movement of the operating rod in the return direction, and gas is supplied to the burner. The amount gradually increases,
Further, when the gas supply amount to the burner is reduced to the minimum amount specified by the bypass passage during burner combustion, the electric motor is set to the control valve valve seat of the valve seat member at the return end position. In the case where the body is normally rotated to a second rotational position that is deviated by a predetermined angle in the normal rotational direction from the first rotational position at which the body is seated,
A diaphragm facing the secondary gas chamber is provided, and a back pressure chamber partitioned from the secondary gas chamber is defined by the diaphragm, and a ventilation path that connects the secondary gas chamber and the back pressure chamber is provided. An electrically operated gas valve is provided, which has a ventilation resistance such that the gas pressure in the back pressure chamber changes with a response delay after the gas pressure in the secondary side gas chamber changes. apparatus.   The diaphragm is arranged so as to face an end portion of the secondary side gas chamber on the backward direction side, the valve seat member is connected to the diaphragm, and the diaphragm is axially displaced together with the valve seat member. The electric gas valve device according to claim 1, wherein   The electric gas valve device according to claim 1 or 2, wherein the ventilation passage is constituted by an orifice hole formed in the diaphragm.

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