JP2006336981A - Stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unburned gas from ejecting from a burner by rotating a motor until a rotation phase of the motor enters a stoppable range and avoiding a situation that a rod member interrupts a valve element of the solenoid valve from closing when abnormality occurs in the motor within a non-stoppable range. <P>SOLUTION: This stove sets a range which a rod 7 interrupts the valve element 21a from closing as a nonstoppable range of the motor 3, and sets a stoppable range out of the non-stoppable range. When the abnormality occurs in a state of the rotation phase of the motor 3 in the nonstoppable range, the motor is rotated to the stoppable range, and then the motor 3 is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stove provided with a thermal power control device with an electromagnetic safety valve driven by a motor.

  As a conventional thermal power control device with an electromagnetic safety valve used in this type of stove, there is a thermal power control device that includes a thermal power control unit that is driven by a motor and that is attached with an electromagnetic safety valve that is opened when the motor rotates forward. It is known (see, for example, Patent Document 1).

  The electromagnetic safety valve has an electromagnet inside, and adsorbs and holds the valve body by electromagnetic force generated by energizing the electromagnet from the outside. However, it is not possible to generate an electromagnetic force enough to attract and open the valve element in the closed state. Therefore, the motor is rotated forward to rotate the cam plate, the rod member is pushed by the cam plate, and the valve body is forcibly pushed in the valve opening direction by the tip of the rod member.

  If the rod member pushes the valve body to the open state, the valve body is held open by electromagnetic force. Therefore, even if the rod member is retracted and separated from the valve body, the electromagnetic safety valve remains open. . In addition, when the ignition of the burner fails or the fire is extinguished during the combustion, the energization to the electromagnet is stopped. Then, since the electromagnetic force that has held the valve element open disappears, the valve element moves in the valve closing direction by the urging force of the spring built in the electromagnetic safety valve, and the electromagnetic safety valve closes.

  On the other hand, the heating power adjusting unit is driven simultaneously when the rod member is pushed and the electromagnetic safety valve is opened, and operates so that the amount of gas supplied to the burner gradually increases from the small fire state. At the time when the electromagnetic safety valve is opened, the opening is such that the gas corresponding to the medium fire is supplied to the burner.

  Further, an original solenoid valve is disposed upstream of the thermal power control device. This original solenoid valve is configured to open and close by external energization. However, a large current must be applied when the valve is opened, but once the valve is opened, only a small current needs to be supplied in order to maintain the valve open state.

  Then, when the electromagnetic safety valve of the thermal power control device is opened, the original electromagnetic valve is opened. Then, gas is actually supplied to the gas burner from the original solenoid valve through the electromagnetic safety valve and further through the thermal power control unit.

Prior to the gas supply to the burner, discharge is started between the spark plug and the burner installed in the vicinity of the burner, and is configured to be ignited immediately when gas is ejected from the burner. Yes.
Japanese Patent Laid-Open No. 2002-323218 (FIG. 1)

  In the conventional thermal power control apparatus, when the burner misfires for some reason during combustion, the electromagnetic safety valve is closed and the supply of gas to the burner is stopped. However, after the rod member opens the valve body of the electromagnetic safety valve, even if the electromagnetic safety valve attempts to close when the valve member is not completely retracted to the original position, the valve body contacts the rod member, so that the valve member is completely closed. The trouble that cannot be done arises.

  In addition, the electromagnetic safety valve is used in a form in which the valve body is pushed open by manual operation, and this is a problem caused for the first time when the electromagnetic safety valve opened by the manual operation is configured to be opened by a motor.

  Then, this invention makes it a subject to provide the stove which does not inhibit the closing of an electromagnetic safety valve, when opening an electromagnetic safety valve with a motor in view of said problem.

  In order to solve the above-described problems, a stove according to the present invention includes a thermal power control unit that increases or decreases the amount of gas supplied to a gas burner by a motor, and an electromagnetic safety valve is attached in series to the thermal power control unit. When the rod member is pushed by the cam means driven by the rod member, and the rod member pushes the valve body of the electromagnetic safety valve, the electromagnetic safety valve is forcibly opened. In a stove equipped with a thermal power control device with an electromagnetic safety valve that keeps the valve open, phase detection means that detects the rotational phase of the motor is provided, and the rod member cannot stop the rotational phase that obstructs the closing of the valve body of the electromagnetic safety valve If a predetermined abnormality occurs while the phase detection means detects that the rotation phase of the motor is within this non-stoppable range, Sets the range enabling stop range other than the range, this causes that it has entered the stop range to rotate the motor until the phase detection means for detecting, characterized in that the motor is stopped in the stop range.

  The motor stop phase is set so that the electromagnetic safety valve can be closed if an abnormality occurs within the motor stop range. The motor was rotated until it was within the possible range. In this case, the motor may be rotated forward or backward.

  A combination of four switch means for switching on and off by the rotation of the motor to form the above-mentioned phase detection means, detecting the rotational phase of the motor by the combination of the on / off states of each switch means, and indicating that it is within the non-stoppable range On the other hand, the combination indicating that it is within the stoppable range is set so that at least two of the four on / off states are different.

  Thus, by making at least two on / off states different, redundancy can be secured against a failure of the switch means.

  By the way, in the present invention, the rod means is driven by interposing a cam means between the motor and the rod means. Therefore, the rod member can still inhibit the closing of the valve body of the electromagnetic safety valve at the moment when the phase of the motor deviates from the non-stoppable range due to hysteresis due to backlash in the transmission system of the driving force, accumulation of assembly accuracy, etc. May occur. In such a case, it is desirable to divide the outside of the unstoppable range into three or more sections and stop the motor beyond the section adjacent to the unstoppable range.

  Further, a stove equipped with a plurality of burners is provided with one original electromagnetic valve that opens and closes when energized from the outside, branches downstream of the original electromagnetic valve into a plurality of branch pipes, and a plurality of them are connected via each branch pipe. When each gas is supplied to each burner and a thermal power control device with an electromagnetic safety valve is installed in each branch pipe, and the rotational phase of any of the thermal power control devices with an electromagnetic safety valve cannot be removed from the non-stoppable range, It is desirable to close the original solenoid valve.

  As is clear from the above description, the present invention rotates the motor until the rotational phase of the motor enters the stoppable range when an abnormality occurs within the motor nonstoppable range. It is possible to avoid a state in which the rod member hinders the valve from closing, and to prevent ejection of unburned gas from the burner.

  Referring to FIGS. 1 and 2, reference numeral 1 denotes a built-in gas stove that operates with a dry battery set in a battery case 10 as a power source. Two large burners 11 and medium burners 12 are different in size on the upper surface. A burner is provided. A grill burner 13 is mounted in a grill cabinet having an opening on the front surface of the gas stove 1. An open / close-type original electromagnetic valve 14 is disposed upstream of each burner. The original solenoid valve 14 is normally closed, and the valve body is sucked in the valve opening direction by energization from the outside and then opened, and thereafter the valve open state is maintained by energization to keep the valve open from the outside. To do.

  A spark plug 15 is attached in the vicinity of each burner. When a high voltage is applied to the spark plug 15, a spark discharge is generated between the vicinity of the flame hole of the burner made of metal and the spark plug 15, and if the gas is ejected from the flame hole, the spark discharge causes the burner to It will ignite. The spark plug 15 is connected to a high pressure generator (not shown).

  In the present embodiment, a thermal power adjusting device 2 that is provided in a branch pipe to the middle burner 12 and adjusts the thermal power of the middle burner 12 will be described. This thermal power control device 2 includes an electromagnetic safety valve 21 on the upstream side and a thermal power control unit 22 located on the downstream side. The electromagnetic safety valve 21 incorporates an electromagnet inside, and holds the valve open state by adsorbing the valve body with the valve opening holding power supplied from a controller (not shown). However, this type of electromagnetic safety valve 21 cannot be opened by attracting the valve body with an electromagnet, and when opening the valve body, the valve body is forcibly pushed to open, and the valve body is attracted to the electromagnet. There is a need. Once the valve body is adsorbed by the electromagnet, the opened state is maintained even if the external forcing force that has forced the valve body to open is removed.

  A thermocouple (not shown) is disposed in the vicinity of each burner and connected to the controller. When the middle burner 12 is extinguished and the voltage of the thermoelectromotive force from the thermocouple falls below a predetermined threshold, the controller The valve opening holding current supplied to 21 is cut off. Then, the valve body automatically returns to the closed state by the biasing force of the built-in spring.

  Referring to FIGS. 3 and 4, stepping motor 3 is attached to heating power adjustment unit 22. The stepping motor 3 is rotated by a pulse signal supplied from a controller (not shown), and is configured to rotate by a rotation angle proportional to the number of pulses supplied. When the supply of pulses stops, the output shaft 31 stops rotating and is locked in that state. Note that two pulse signals having different phases are supplied as the pulse signals, and the rotation direction of the output shaft 31 can be switched between forward and reverse directions by inverting the phase shift between the two pulse signals.

  Two cams 4 are attached to the output shaft 31. The cam 4 is formed with two upper and lower cam portions 41, 42, and the origin of the output shaft 31 is detected by detecting the on / off state of the two micro switches 41 a, 42 a disposed on the side of the cam 4. The position and rotational phase are detected to determine the occurrence of step-out and the degree of step-out.

  A rotating shaft 32 that rotates in conjunction with the output shaft 31 is provided via the cam 4. The drive member 5 is fixed to the tip of the rotating shaft 32. The drive member 5 is formed with a pair of engaging protrusions 51 extending upward.

  A cylindrical cam member 6 is attached so as to surround the drive member 5. The cam member 6 rotates by engaging with the engaging projection 51, and a cam surface 61 is formed on the outer peripheral surface. A slider 71 slidably attached to the rod 7 is brought into contact with the cam surface 61 by a biasing force of a spring 72. When the cam member 6 rotates and pushes the slider 71 in a direction perpendicular to the rotation shaft 32, the rod 7 is also pushed and moved together with the slider 71.

  The valve body 21a of the electromagnetic safety valve 21 is positioned in the distal end direction of the rod 7, and when the rod 7 is pushed and moved, the distal end of the rod 7 pushes the valve body 21a to forcibly open the electromagnetic safety valve 21. . Note that a spring 73 is attached between the slider 71 and the rod 7, so that even if the slider 71 is further pushed from the state where the rod 7 pushes the valve body 21 a, the rod 7 does not slide. It is possible to prevent an unreasonable stress from entering the moving element 71 and acting on the valve body 21a. The valve body 21a is always urged in the valve closing direction by the spring 21b.

  An opening / closing plate 8 is attached above the driving member 5, and the opening / closing plate 8 is in contact with the upper gas passage plate 9 by a biasing force of a spring. The engaging protrusions 51 extend upward, and the pair of engaging protrusions 51 are engaged with the opening / closing plate 8. Therefore, when the rotating shaft 32 rotates, the rotational force is transmitted to the opening / closing plate 8 through the driving member 5, and the opening / closing plate 8 rotates.

  The opening / closing plate 8 is provided with a valve opening hole 81 penetrating vertically. On the other hand, the gas passage plate 9 is provided with a plurality of gas passage holes 91 penetrating vertically. When the opening / closing plate 8 rotates, the valve opening hole 81 coincides with one of the gas passage holes 91. Then, the gas flows upward through the matched gas passage hole 91. When the opening / closing plate 8 is rotated, the number and size of the gas passage holes 91 that coincide with the valve opening holes 81 change, so that the flow rate of the gas flowing upward increases or decreases.

  An orifice plate 93 is attached to the upper surface of the gas passage plate 9 via a rubber gasket 92. In particular, when a gas having a flow rate corresponding to a medium to low heat flows, the gas amount depends on the gas type. Is adjusted. Therefore, if the gas type is different, only the orifice plate 93 needs to be replaced.

  Referring to FIG. 5, FIG. 5 (a) shows a standby position which is a start position. The pair of engaging protrusions 51 rotate in the forward rotation direction with the clockwise direction from the standby position as the forward rotation direction.

  A pair of protrusions are formed on the inner side of the cylindrical cam member 6, and the surfaces of the protrusions that contact the engaging protrusions 51 when they rotate in the forward rotation direction are the first engaging portions. As the engaging protrusion 51 comes into contact with the first engaging portion 62 and the engaging protrusion 51 rotates in the forward rotation direction, the cam member 6 also rotates in the forward rotation direction. A cam surface 61 is formed on the outer peripheral surface of the cam member 6. When the cam member 6 rotates, the cam surface 61 starts to push the slider 71 in the right direction in the drawing. Then, when the tip of the rod 7 presses the valve body 21a, the opening operation of the electromagnetic safety valve 21 is started (safety valve opening start).

  FIG. 5B shows a state where the cam surface 61 completely pushes the rod 7 rightward through the slider 71. During the transition from the state shown in FIG. 5A to the state shown in FIG. 5B, the electromagnetic safety valve 21 is pushed by the rod 7 and opened as described above.

  Then, when rotating from that state to the angle shown in FIG. 5C, the cam surface 61 does not press the slider 71, and the slider 71 together with the rod 7 is pressed by the urging force of the return spring 72. Return to the left (rod return).

  The above operation is performed at the time of ignition operation, and the contents of control when the middle burner 12 is ignited from the state where all of the large burner 11, the middle burner 12, and the grill burner 13 are extinguished will be described.

  The drive of the motor 3 is started from the ignition start time. Until the motor 3 rotates to the rod return phase, the original solenoid valve 14 remains in the initial closed state. From the start of ignition, the electromagnetic safety valve 21 is energized for holding the valve in parallel. Therefore, even if the rod 7 is retracted by returning the rod, the electromagnetic safety valve 21 remains open.

  When the motor 3 operates to the rod return phase, the energization to the motor 3 is temporarily stopped, and instead the energization for opening the valve is performed on the original electromagnetic valve 14. Then, after energization of the original solenoid valve 14 is continued for a predetermined time, the energization is stopped.

  At this time, the original solenoid valve 14 is opened and the thermal power control unit 22 is also at a predetermined opening, so that an appropriate amount of gas is ejected from the intermediate fire burner 12 for ignition. From this state, the operation of the motor 3 is started again, the discharge of the spark plug 15 is started for a predetermined time, and the medium-burn burner 12 is ignited.

  The above is a description of the case where the medium-burn burner 12 is initially ignited. However, for example, the case where the medium-burn burner 12 is ignited while the large-fire burner 11 is already ignited will be described.

  Since the large fire burner 11 which is another burner has already been ignited, the original solenoid valve 14 is opened. Therefore, it is not necessary to open the original solenoid valve 14 from the closed state.

  Therefore, when the phase of the motor 3 reaches the rod return position, the spark plug 15 starts discharging for a predetermined time. At that time, since the rod 7 is retracted from the state that obstructs the valve closing of the valve body 21a, it is not necessary to stop the operation of the motor 3. Therefore, the motor 3 is continuously operated without being stopped.

  Although the above operation is normal, if any abnormality occurs in the state shown in FIG. 6, that is, in a state where the electromagnetic safety valve 21 is not completely opened, the valve body 21 a of the electromagnetic safety valve 3 is in that state. Can't be closed due to obstruction.

  Referring to FIG. 7, the entire rotational phase of motor 3 was divided into eight sections P1 to P8. Among these, since the rod 7 obstructs the valve closing of the valve body 21a in the three sections P2, P3, and P4, these three sections were set in the non-stoppable range. On the other hand, as a range in which the rod 7 does not obstruct the valve closing of the valve body 21a reliably, the three sections P6, P7, and P8 are installed in the stoppable range. In addition, P5 and P1 shown by * 1 were made into the buffering range as a range adjacent to the stop impossible range.

  If an abnormality occurs when the rotational phase of the motor 3 is within the stop impossible range, the motor 3 is rotated until the rotational phase of the motor 3 leaves the stop impossible range and enters the stop possible range. When it is confirmed that the rotational phase of the motor 3 is within the stoppable range, the motor 3 is stopped at that time, and predetermined error processing is performed. The motor 3 is kept stopped until the error is released. For this reason, the electromagnetic safety valve 21 remains in a closed state, is not opened, and no gas is supplied to the burner.

  Note that the on / off states ("0010, 0000, 1000") of the micro switches 41a and 41b in P2 to P4, which are non-stoppable ranges, and the on / off states ("1011, 1111, 1110") in P6 to P8 that are stoppable ranges. Since two or more combinations of “0” and “1” are different from each other, even if one of the micro switches 41a and 41b fails, the rotational phase of the motor 3 is within the range of P6 to P8. It is possible to reliably detect the rotation until In addition, the rotation direction of the motor 3 at this time may be a forward rotation direction or a reverse rotation direction.

  However, if it is not possible to detect that the rotational phase of the motor 3 is within the stoppable range even after a predetermined time has elapsed, as an emergency, the motor 3 is rotated until the rotational phase of the motor 3 enters the buffer range (P1 or P5). 3 was rotated, and if it was confirmed that it entered the buffer range, the motor 3 was stopped at that time.

  When it is not possible to detect that both the stoppable range and the buffering range have been entered, the original solenoid valve 14 is closed to stop supplying gas to all the burners.

  By the way, in the embodiment shown in FIG. 7, the range other than the non-stoppable range is divided into the stoppable range and the buffer range. You may install all P8 (range shown by * 2) in the stop possible range. In this case, for example, P1 is set to (0, 1, 1, 1) and P5 is set to (1, 1, 0, 1). It is desirable to set differently.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention Block diagram showing burner configuration Perspective view showing the internal structure of the thermal power control device Front sectional view showing the internal structure of the thermal power control device V sectional view showing movement of cam member The figure which shows the state of the cam member in the middle of ignition operation Diagram showing motor rotation phase and valve open state

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas stove 2 Thermal power control apparatus 3 Stepping motor 5 Drive member 6 Cam member 8 Opening / closing plate 9 Gas passage plate 21 Electromagnetic safety valve 51 Engagement protrusion

Claims (4)

  A thermal power control unit for increasing or decreasing the amount of gas supplied to the gas burner by the motor is provided, and an electromagnetic safety valve is attached in series with the thermal power control unit, and the rod member is pushed by cam means driven by the rotation of the motor. When the rod member pushes the valve body of the electromagnetic safety valve, the electromagnetic safety valve is forcibly opened, and when the rod member is retracted with the gas burner ignited, the valve body is opened and held. The stove provided is provided with phase detection means for detecting the rotational phase of the motor, the rotational phase in which the rod member obstructs the valve closing of the electromagnetic safety valve is set as a non-stoppable range, and the rotational phase of the motor is within this non-stoppable range If a predetermined abnormality occurs while the phase detection means detects that the stop is possible, a stoppable range is set in a range other than the non-stoppable range. Enabling entering things within the motor is rotated until the phase detection means for detecting, characterized in that the motor is stopped in the stop range stove.   A combination of four switch means for switching on and off by the rotation of the motor to form the above-mentioned phase detection means, detecting the rotational phase of the motor by the combination of the on / off states of each switch means, and indicating that it is within the non-stoppable range On the other hand, the stove according to claim 1, wherein the combination indicating that it is within the stoppable range is set to be different from at least two of the four on / off states.   The stove according to claim 1 or 2, wherein the outside of the non-stoppable range is divided into three or more sections, and the motor is stopped beyond a section adjacent to the non-stoppable range. Provided with one original solenoid valve that opens and closes when energized from the outside, branches downstream of the original solenoid valve into a plurality of branch pipes, and supplies gas to each of the plurality of burners via each branch pipe, A thermal power control device with an electromagnetic safety valve is installed in each branch pipe, and when the rotational phase of any one of the thermal power control devices with an electromagnetic safety valve cannot be removed from the non-stoppable range, the original solenoid valve is closed. The stove according to any one of claims 1 to 3, characterized in that:

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