JP2018128198A - Gas combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion apparatus that allows a burner to catch fire safely even if open failure occurs in a second on/off valve, where the second on/off valve 4 is composed of a flow-rate-adjustable motor valve that includes a valve body 42 that opposes a valve seat 41, an electromagnet 45 that opposes an armature 44 connected to the valve body, an operation rod 46 for moving the valve seat or the electromagnet in an axial direction, and a motor for driving the operation rod in the combustion apparatus in which first and second on/off valves 3, 4 are interposed in a gas supply route 2 to a burner 1.SOLUTION: In ignition of a burner 1, a valve seat 41 of a second on/off valve 4, or an electromagnet 45 is allowed to be in forward motion to an attraction start position in which an armature 44 abuts on the electromagnet 45 while a valve body 42 is allowed to be seated in the valve seat 41, a first on/off valve 3 is opened, and sparks are generated by an ignition electrode 11 and at the same time the valve seat 41 or the electromagnet 45 are allowed to be in returning motion from the attraction start position while the armature 44 is attracted by the electromagnet 45 of the second on/off valve 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas combustion apparatus provided with two on-off valves interposed in series in a gas supply path for a burner.

  In this type of gas combustion apparatus, the two on-off valves are provided in the gas supply passage in order to ensure reliability against gas leakage by shutting off the gas twice with both on-off valves when not in use. . Moreover, what comprises one on-off valve with the motor valve known by patent document 1 or patent document 2 is also known conventionally.

  This motor valve is located on the opposite side of the valve seat connected to the valve body, a valve body facing the valve seat in the axial direction, a return spring that biases the valve body in the closing direction approaching the valve seat, and An armature, an electromagnet opposed to the armature in the axial direction, an operating rod for moving the valve seat (the one in Patent Document 1) or the electromagnet (the one in Patent Document 2) in the axial direction, and driving the operating rod in the axial direction The motor rod is moved in one axial direction to the adsorption start position where the electromagnet abuts the armature while the valve element is seated on the valve seat by moving the operating rod in one axial direction. After that, when the armature is attracted to the electromagnet, the valve rod or electromagnet is moved back from the suction start position to the other axial direction by moving the operating rod in the other axial direction, and the valve body is separated from the valve seat and opened. And the operation lock It is configured to increase gradually the gas flow with the the movement of the other axial direction, and has a flow rate adjusting function.

  When the burner is extinguished, energization of the electromagnet of one on-off valve is stopped to release the armature, and the valve element is seated on the valve seat with the biasing force of the return spring to close one on-off valve The other opening / closing valve is also closed. When the burner is ignited, first, the other on-off valve is opened prior to one on-off valve having a flow rate adjusting function, and then, while the spark is generated by the ignition electrode attached to the burner, The on-off valve is opened as described above to gradually increase the gas flow rate so that the burner can be ignited safely.

  However, in one of the on-off valves, an armature may stick to the electromagnet, and an open failure may occur in which the valve element remains separated from the valve seat even when energization of the electromagnet is stopped. In this case, when the burner is ignited, a large amount of gas flows to the burner at the moment when the other on-off valve is opened, and there is a risk of explosion ignition.

JP 2013-68356 A JP 2011-196416 A

  In view of the above, an object of the present invention is to provide a gas combustion apparatus that can safely ignite a burner even when an open failure of one on-off valve composed of a motor valve occurs.

  In order to solve the above-described problems, the present invention provides a gas combustion apparatus including two on-off valves connected in series to a gas supply path for a burner, and one on-off valve is provided in an axial direction with respect to a valve seat. An opposing valve body, a return spring that urges the valve body in a closing direction approaching the valve seat, an armature that is connected to the valve body and that is located on the opposite side of the valve seat, and an electromagnet that faces the armature in the axial direction And an operating rod that moves the valve seat or electromagnet in the axial direction and a motor that drives the operating rod in the axial direction, and the valve body is seated on the valve seat by moving the operating rod in one axial direction. After the valve seat or electromagnet is moved forward in one axial direction to the adsorption start position where the electromagnet contacts the armature, the valve rod or electromagnet is moved by moving the operating rod in the other axial direction with the armature attracted to the electromagnet. Adsorption start position From a motor valve configured to move back from the valve seat to the other axial direction, open the valve body away from the valve seat, and gradually increase the gas flow rate as the operating rod moves in the other axial direction. When the burner is ignited, the valve seat or electromagnet of one on-off valve is moved forward to the adsorption start position, the other on-off valve is opened, and an ignition electrode attached to the burner is used to spark. The valve seat or electromagnet of one on-off valve is moved backward from the adsorption start position in a state where the armature is adsorbed on the electromagnet of one on-off valve.

  According to the present invention, even when one open / close valve composed of a motor valve has an open failure, the valve body is moved to the adsorption start position by moving the valve seat or electromagnet of one open / close valve to the adsorption start position when the burner is ignited. After sitting on the seat, one of the on-off valves is forcibly closed, and in this state, the other on-off valve is opened. Therefore, a large amount of gas does not flow to the burner at the moment when the other opening / closing valve is opened, and explosion ignition does not occur. After the other on / off valve is opened, one of the on / off valves is opened and the gas flow rate gradually increases. Therefore, even if one of the on / off valves fails to open, the burner can safely ignite in the same way as normal. it can.

Explanatory drawing which shows the structure of the gas combustion apparatus of 1st Embodiment of this invention. (A)-(c) Operation | movement explanatory drawing of the 2nd on-off valve used with the gas combustion apparatus of 1st Embodiment. The flowchart which shows the content of the ignition control performed with the gas combustion apparatus of 1st Embodiment. Explanatory drawing which shows the structure of the gas combustion apparatus of 2nd Embodiment.

  With reference to FIG. 1, 1 is a burner provided in a gas combustion apparatus such as a gas stove. In the gas supply path 2 to the burner 1, a first on-off valve 3 composed of an upstream solenoid valve and the like and a downstream second on-off valve 4 are interposed in series.

  The second on-off valve 4 is provided in the axial direction (left-right direction in FIG. 1) provided in the flow path portion between the inflow port 40a and the outflow port 40b in the valve housing 40 having the inflow port 40a and the outflow port 40b. A movable valve seat 41, a valve body 42 facing the valve seat 41 in the axial direction, and a return spring 43 for biasing the valve body 42 in a closing direction (leftward in FIG. 1) approaching the valve seat 41; An armature 44 located on the opposite side of the valve seat 41, connected to the valve body 42 via a valve shaft 42a, an electromagnet 45 facing the armature 44 in the axial direction, and an operating rod for moving the valve seat 41 in the axial direction 46 and a motor valve provided with a motor 47 that drives the operation rod 46 in the axial direction via a motion conversion mechanism such as a cam mechanism or a feed screw mechanism (not shown).

  The valve seat 41 is urged by a spring 411 to a return end position that contacts the other end (left side in FIG. 1) of the valve housing 40 in the axial direction, and gas flows to the outer periphery of the valve seat 41. A seal member 412 is provided for prevention. The valve seat 41 is formed with a valve hole 41a and a step portion 41b facing the other in the axial direction. On the other hand, the operating rod 46 includes a needle portion 46a that can be inserted into the valve hole 41a, a bypass hole 46b for securing a minimum flow rate that penetrates the needle portion 46a in the axial direction, and a shoulder portion 46c that can contact the step portion 41b. And are formed.

  When the operating rod 46 is moved in one axial direction (to the right in FIG. 1), the needle portion 46a is inserted into the valve hole 41a, and the shoulder portion 46c comes into contact with the step portion 41b. 41 moves forward in the axial direction from the return end position. Then, with the valve body 42 seated on the valve seat 41, the valve body 41 moves forward in one axial direction together with the valve seat 41 until the armature 44 finally contacts the electromagnet 45 until the adsorption start position shown in FIG. The valve seat 41 moves forward, and in this state, the electromagnet 45 is energized to attract the armature 44. When the operating rod 46 is moved in the other axial direction while the armature 44 is attracted to the electromagnet 45, the valve seat 41 is shown in FIG. 2B together with the operating rod 46 by the biasing force of the spring 411 from the attracting start position. The actuator moves backward in the axial direction to the return end position. Thereby, the valve body 42 is separated from the valve seat 41 and opened, and the gas flows through the bypass hole 46b. When the operating rod 46 is continuously moved in the other axial direction, the needle portion 46a gradually comes out of the valve hole 41a as shown in FIG. 2C, and the gas flow rate gradually increases.

  When the burner is extinguished, the first on-off valve 3 is closed, the energization of the electromagnet 45 of the second on-off valve 4 is stopped, the adsorption of the armature 44 is released, and the valve element 42 is moved by the biasing force of the return spring 43. The second on-off valve 4 is closed by being seated on the valve seat 41 as shown in FIG. However, even if the armature 44 is attached to the electromagnet 45 and the energization of the electromagnet 45 is stopped, the valve element 42 may be left open from the valve seat 41. In this case, when the first on-off valve 3 is opened at the time of ignition of the burner, a large amount of gas may flow into the burner 1 to cause explosion ignition.

  Therefore, in this embodiment, the ignition control shown in FIG. 3 is performed when the ignition switch is turned on. In this ignition control, first, the valve seat 41 of the second on-off valve 4 is moved forward to the adsorption start position in STEP 1, and then the first on-off valve 3 is opened in STEP 2. Next, proceeding to STEP 3, while the spark is generated by the ignition electrode 11 attached to the burner 1, the gas flow rate of the valve seat 41 from the adsorption start position is increased while the armature 44 is adsorbed to the electromagnet 45 of the second on-off valve 4. Return to a position suitable for ignition. Note that the energization start timing for the electromagnet 45 may be any time as long as the valve seat 41 does not start to move backward from the adsorption start position. Next, it is determined whether or not the burner 1 has been ignited in STEP 4, and if it is ignited, the ignition control is terminated as it is, and if not ignited, both the first and second on-off valves 3 and 4 are closed in STEP 5. The ignition control is terminated after the valve is turned on.

  According to the above ignition control, even when the second on-off valve 4 has an open failure, the valve element 42 is moved forward by moving the valve seat 41 of the second on-off valve 4 to the adsorption start position at the time of burner ignition. The second on-off valve 4 is forcibly closed after sitting on the seat 41, and the first on-off valve 3 is opened in this state. Therefore, a large amount of gas does not flow to the burner 1 at the moment when the first on-off valve 3 is opened, and no explosion ignition occurs. And since the 2nd on-off valve 4 opens and the gas flow rate increases after the 1st on-off valve 3 opens, even if the open failure of the 2nd on-off valve 4 arises, the burner 1 is the same as normal. Can be ignited safely.

  Next, a second embodiment shown in FIG. 4 will be described. In FIG. 4, the same members as those in the first embodiment are denoted by the same reference numerals as described above. In the second embodiment, the second on-off valve 4 has a valve seat 41 fixed to the valve housing 40 and an electromagnet 45 connected to an operating rod 46 driven in the axial direction (vertical direction) by a motor 47. The valve body 42 is connected to a tubular flow rate adjusting member 421 that is inserted into a bag hole-shaped valve hole 41 a formed in the valve seat 41. An inlet 422 is formed in the end wall portion of the flow rate adjusting member 421 on the valve body 42 side, and the peripheral wall portion is displaced in the axial direction and is increased toward the one side in the axial direction (downward in FIG. 4). An outlet 423 is formed. The outflow port 40b is formed so as to communicate with the peripheral surface of the intermediate portion of the valve hole 41a.

  In this case, the electromagnet 45 is moved forward in one axial direction to the adsorption start position where the electromagnet 45 contacts the armature 44 with the valve element 42 seated on the valve seat 41 by the movement of the operation rod 46 in one axial direction. After the armature 44 is attracted to the electromagnet 45, the operation rod 46 is moved in the other axial direction (upward in FIG. 4) to move the electromagnet 45 back to the other axial direction from the adsorption start position. The body 42 is separated from the valve seat 41 and opened. When the valve is opened, gas flows into the flow rate adjusting member 421 from the inflow port 422 and flows from the outflow port 423 to the outflow port 40b. As the operating rod 46 moves in the other axial direction, the flow rate adjusting member 421 moves together with the valve body 42 in the other axial direction, and the outlet 423 that matches the communicating portion with the outflow port 40b becomes larger. Therefore, the gas flow rate gradually increases.

  The ignition control in the second embodiment is different from that in the first embodiment only in that the electromagnet 45 is moved forward to the adsorption start position in STEP 1 of FIG. 2 and the electromagnet 45 is moved back from the adsorption start position in STEP 3. Others are the same. And even if the open failure of the second on-off valve 4 occurs, the valve element 42 is seated on the valve seat 41 by moving the electromagnet 45 of the second on-off valve 4 to the adsorption start position at the time of burner ignition, The second on-off valve 4 is forcibly closed, and the first on-off valve 3 is opened in this state. Therefore, a large amount of gas does not flow to the burner 1 at the moment when the first on-off valve 3 is opened, and no explosion ignition occurs. And since the 2nd on-off valve 4 opens and the gas flow rate increases after the 1st on-off valve 3 opens, even if the open failure of the 2nd on-off valve 4 arises, the burner 1 is the same as normal. Can be ignited safely.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the second on-off valve 4 composed of a motor valve having a flow rate adjusting function is provided downstream of the first on-off valve 3, but the second on-off valve 4 is connected to the first on-off valve 3. It may be provided upstream. Further, the first on-off valve 3 can be constituted by a motor valve that does not have a flow rate adjusting function, in which the flow rate adjusting member 421 in FIG. 4 is omitted.

DESCRIPTION OF SYMBOLS 1 ... Burner, 11 ... Ignition electrode, 2 ... Gas supply path, 3 ... 1st on-off valve, 4 ... 2nd on-off valve (one on-off valve), 41 ... Valve seat, 42 ... Valve body, 43 ... Return spring, 44 ... armature, 45 ... electromagnet, 46 ... operating rod, 47 ... motor.

Claims (1)

A gas combustion apparatus comprising two on-off valves interposed in series in a gas supply path to a burner,
One open / close valve is positioned on the opposite side of the valve seat, connected to the valve body, a valve body facing the valve seat in the axial direction, a return spring for biasing the valve body in the closing direction approaching the valve seat, and Armature, an electromagnet that is axially opposed to the armature, an operating rod that moves the valve seat or the electromagnet in the axial direction, and a motor that drives the operating rod in the axial direction. With the valve body seated on the valve seat by movement, the valve seat or electromagnet is moved forward in the axial direction to the adsorption start position where the electromagnet contacts the armature, and then the operating rod is attracted to the electromagnet. Movement of the operating rod in the other axial direction causes the valve seat or electromagnet to move backward from the suction start position to the other axial direction, the valve body is separated from the valve seat and opened, and the operating rod moves in the other axial direction. With the gas flow In those consisting of a motor valve configured to the second increase,
When the burner is ignited, the valve seat or electromagnet of one on-off valve is moved forward to the adsorption start position, the other on-off valve is opened, and a spark is generated by the ignition electrode attached to the burner. The gas is characterized in that the valve seat or electromagnet of one on-off valve is moved back in the axial direction from the suction start position while the armature is adsorbed on the electromagnet of one on-off valve. Combustion device.

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