JP6769886B2 - Gas combustion device - Google Patents

Description

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

In this type of gas combustion device, two on-off valves are provided in the gas supply path in order to double shut off gas by both on-off valves when not in use to ensure reliability against gas leakage. .. Further, it is conventionally known that one on-off valve is composed of a motor valve known in Patent Document 1 and Patent Document 2.

This motor valve is located on the opposite side of the valve seat, which is connected to the valve body, the valve body that faces the valve seat in the axial direction, the return spring that urges the valve body in the closing direction that approaches the valve seat, and the valve body. The armature, the electromagnet that is axially opposed to the armature, the operation rod that moves the valve seat (of Patent Document 1) or the electromagnet (of Patent Document 2) in the axial direction, and the operation rod that drives the operation rod in the axial direction. It is equipped with a motor, and by moving the operation rod in one axial direction, the valve seat or electromagnet is moved in one axial direction to the suction start position where the electromagnet abuts on the armature with the valve body seated on the valve seat. After that, by moving the operation rod to the other axial direction with the armature attracted to the electromagnet, the valve seat or the electromagnet is relocated from the suction start position to the other axial direction, and the valve body is separated from the valve seat and opened. It is configured to valve and gradually increase the gas flow rate as the operating rod moves in the other direction in the axial direction, and has a flow rate adjusting function.

When the burner fire is extinguished, the energization of one of the on-off valves to the electromagnet is stopped to release the suction of the armature, and the valve body is seated on the valve seat by the urging force of the return spring to close one on-off valve. , The other on-off valve is also closed. When igniting the burner, first, the other on-off valve is opened prior to one on-off valve having a flow rate adjusting function, and then the ignition electrode attached to the burner generates sparks on the other hand. The on-off valve of the above 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, the armature may stick to the electromagnet, causing an open failure in which the valve body remains separated from the valve seat even when the energization of the electromagnet is stopped. In this case, when the burner is ignited, a large amount of gas may flow to the burner at the moment when the other on-off valve is opened, causing an explosion ignition.

Japanese Unexamined Patent Publication No. 2013-68356 Japanese Unexamined Patent Publication No. 2011-196416

In view of the above points, it is an object of the present invention to provide a gas combustion device capable of safely igniting a burner even if one of the on-off valves composed of a motor valve fails to open.

In order to solve the above problems, the present invention is a gas combustion device including two on-off valves interposed in series with the gas supply path to the burner, and one on-off valve is axial with respect to the valve seat. Opposing valve bodies, return springs that urge the valve bodies to approach the valve seat in the closing direction, armatures connected to the valve body located on the opposite side of the valve seat, and electromagnets axially opposed to the armature. A state in which an operation rod for moving the valve seat or the electromagnet in the axial direction and a motor for driving the operation rod in the axial direction are provided, and the valve body is seated on the valve seat by moving the operation rod in one axial direction. After moving the valve seat or electromagnet in one axial direction to the attraction start position where the electromagnet abuts on the armature, the valve seat or electromagnet is moved in the other direction in the axial direction while the armature is attracted to the electromagnet. Is revolved from the suction start position to the other in the axial direction, the valve body is separated from the valve seat to open the valve, and the gas flow rate is gradually increased as the operation rod moves to the other in the axial direction. When the burner is ignited, the valve seat or electromagnet of one on-off valve is moved to the suction start position, the other on-off valve is opened, and the burner is attached to the motor valve. While generating sparks at the ignition electrode, the valve seat of one on-off valve or the electromagnet was reactivated from the attraction start position in order while the armature was attracted to the electromagnet of one on-off valve. It is a feature.

According to the present invention, even if one on-off valve composed of a motor valve fails to open, the valve body can be valved by moving the valve seat or electromagnet of one on-off valve to the suction start position when the burner is ignited. When seated on the seat, one on-off valve 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 on-off valve is opened, and explosion ignition does not occur. Then, after the opening of the other on-off valve, one on-off valve opens and the gas flow rate gradually increases. Therefore, even if one on-off valve fails to open, the burner is safely ignited as in the normal state. it can.

Explanatory drawing which shows the structure of the gas combustion apparatus of 1st Embodiment of this invention. (A)-(c) Operation explanatory view of the second on-off valve used in the gas combustion apparatus of the first embodiment. The flow chart which shows the content of the ignition control performed by the gas combustion apparatus of 1st Embodiment. The explanatory view which shows the structure of the gas combustion apparatus of 2nd Embodiment.

With reference to FIG. 1, reference numeral 1 denotes a burner provided in a gas combustion device such as a gas stove. In the gas supply path 2 for the burner 1, a first on-off valve 3 composed of a solenoid valve on the upstream side and a second on-off valve 4 on the downstream side 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 that faces the valve seat 41 in the axial direction, and a return spring 43 that urges the valve body 42 in the closing direction (left side 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 axially opposed to the armature 44, and an operation rod for moving the valve seat 41 in the axial direction. It is composed of a motor valve including a 46 and 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 at a return end position that abuts on 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 sealing member 412 for preventing is provided. 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 operation rod 46 has a needle portion 46a that can be inserted into the valve hole 41a, a bypass hole 46b that penetrates the needle portion 46a in the axial direction for securing the minimum flow rate, and a shoulder portion 46c that can come into contact with 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, the shoulder portion 46c comes into contact with the step portion 41b, and thereafter the valve seat together with the operating rod 46. 41 moves forward from the return end position in one axial direction. Then, while the valve body 42 is seated on the valve seat 41, it moves forward in one axial direction together with the valve seat 41, and finally reaches the suction start position shown in FIG. 2A where the armature 44 abuts on the electromagnet 45. 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 to the other axial direction with the armature 44 attracted to the electromagnet 45, the valve seat 41 is shown in FIG. 2 (b) together with the operating rod 46 by the urging force of the spring 411 from the suction start position. It returns to the other side in the axial direction to the position of the return end. As a result, the valve body 42 is separated from the valve seat 41 to open the valve, and the gas flows through the bypass hole 46b. When the operating rod 46 is continuously moved to the other side in the 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 fire is extinguished, the first on-off valve 3 is closed, the energization of the second on-off valve 4 to the electromagnet 45 is stopped to release the adsorption of the armature 44, and the valve body 42 is returned by the urging force of the return spring 43. As shown in FIG. 1, the second on-off valve 4 is closed by being seated on the valve seat 41. However, the armature 44 may stick to the electromagnet 45, causing an open failure in which the valve body 42 remains separated from the valve seat 41 even when the energization of the electromagnet 45 is stopped. In this case, when the burner is ignited, a large amount of gas may flow to the burner 1 at the moment when the first on-off valve 3 is opened, causing an explosion ignition.

Therefore, in the present 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 to the suction start position in STEP 1, and then the first on-off valve 3 is opened in STEP 2. Next, the process proceeds to STEP3, and the gas flow rate is increased from the suction start position of the valve seat 41 in a state where the armature 44 is attracted to the electromagnet 45 of the second on-off valve 4 while generating sparks at the ignition electrode 11 attached to the burner 1. React to a position suitable for ignition. The start time of energization of the electromagnet 45 may be any time before the start of recovery of the valve seat 41 from the suction start position. Next, it is determined in STEP4 whether or not the burner 1 is ignited, and if it is ignited, the ignition control is terminated as it is, and if it is not ignited, both the first and second on-off valves 3 and 4 are closed in STEP5. After making the valve, the ignition control is terminated.

According to the above ignition control, even if the second on-off valve 4 fails to open, the valve body 42 can be valved by moving the valve seat 41 of the second on-off valve 4 to the suction start position at the time of burner ignition. When seated on the seat 41, the second on-off valve 4 is forcibly closed, and in this state, the first on-off valve 3 is opened. 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 explosion ignition does not occur. Then, after the first on-off valve 3 is opened, the second on-off valve 4 is opened and the gas flow rate gradually increases. Therefore, even if the opening failure of the second on-off valve 4 occurs, the burner 1 is the same as in the normal state. Can be safely ignited.

Next, the second embodiment shown in FIG. 4 will be described. In FIG. 4, the same member parts as those in the first embodiment are designated by the same reference numerals as described above. In the second embodiment, in the second on-off valve 4, the valve seat 41 is fixed to the valve housing 40, and the electromagnet 45 is connected to the operation rod 46 driven by the motor 47 in the axial direction (vertical direction). A tubular flow rate adjusting member 421 inserted into the bag hole-shaped valve hole 41a formed in the valve seat 41 is connected to the valve body 42. An inflow port 422 is formed on the end wall portion of the flow rate adjusting member 421 on the valve body 42 side, and a plurality of peripheral wall portions are displaced in the axial direction and become larger toward one side in the axial direction (lower side in FIG. 4). An outlet 423 is formed. Further, 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 device, by moving the operation rod 46 in one axial direction, the electromagnet 45 moves in one axial direction to the suction start position where the electromagnet 45 abuts on the armature 44 with the valve body 42 seated on the valve seat 41. After the armature 44 is attracted to the electromagnet 45, the operation rod 46 is moved to the other axial direction (upper part of FIG. 4) to reactivate the electromagnet 45 from the suction start position to the other axial direction, and the valve. The body 42 is separated from the valve seat 41 to open the valve. When the valve is opened, gas flows into the inside of the flow rate adjusting member 421 from the inflow port 422, and this gas flows from the outflow port 423 to the outflow port 40b. Then, as the operation rod 46 moves to the other axial direction, the flow rate adjusting member 421 moves to the other axial direction together with the valve body 42, and the outflow port 423 matching the communication 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 of the first embodiment in that the electromagnet 45 is moved forward to the suction start position in STEP 1 of FIG. 2 and the electromagnet 45 is moved back from the suction start position in STEP 3. Others are the same. Then, even if the opening failure of the second on-off valve 4 occurs, the valve body 42 is seated on the valve seat 41 by moving the electromagnet 45 of the second on-off valve 4 to the suction start position when the burner is ignited. 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 explosion ignition does not occur. Then, after the first on-off valve 3 is opened, the second on-off valve 4 is opened and the gas flow rate gradually increases. Therefore, even if the opening failure of the second on-off valve 4 occurs, the burner 1 is the same as in the normal state. Can be safely ignited.

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 embodiment, the second on-off valve 4 composed of a motor valve having a flow rate adjusting function is interposed on the downstream side of the first on-off valve 3, but the second on-off valve 4 is provided on the first on-off valve 3. It may be installed on the upstream side. It is also possible to configure the first on-off valve 3 with a motor valve that does not have a flow rate adjusting function, omitting the flow rate adjusting member 421 of FIG.

1 ... Burner, 11 ... Ignition electrode, 2 ... Gas supply path, 3 ... First on-off valve, 4 ... Second on-off valve (one on-off valve), 41 ... Valve seat, 42 ... Valve body, 43 ... Return spring, 44 ... Armature, 45 ... Electromagnet, 46 ... Operation rod, 47 ... Motor.

Claims (1)

A gas combustion device equipped with two on-off valves connected in series with the gas supply path to the burner.
One on-off valve is located on the opposite side of the valve seat, which is connected to the valve body, the valve body that faces the valve seat in the axial direction, the return spring that urges the valve body in the closing direction that approaches the valve seat, and the valve body. The armature is provided, an electromagnet facing the armature in the axial direction, an operation rod for moving the valve seat or the electromagnet in the axial direction, and a motor for driving the operation rod in the axial direction. By moving, the valve seat or the electromagnet is moved in one axial direction to the attraction start position where the electromagnet abuts on the armature with the valve body seated on the valve seat, and then the operation rod with the armature attracted to the electromagnet. By moving the valve seat or electromagnet to the other axial direction from the attraction start position, the valve body is separated from the valve seat to open the valve, and the operation rod is moved to the other axial direction. In those consisting of motor valves configured to gradually increase the gas flow rate with
When igniting the burner, while moving the valve seat or electromagnet of one on-off valve to the suction start position, opening the other on-off valve, and generating sparks with the ignition electrode attached to the burner. , A gas characterized in that the valve seat of one on-off valve or the electromagnet is reactivated in the axial direction from the suction start position in a state where the armature is attracted to the electromagnet of one on-off valve. Combustion device.

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