JP4558576B2 - Gas control device - Google Patents

Description

  The present invention relates to a gas control device disposed in a gas passage extending from a gas supply source having a fuse for preventing an excessive outflow of fuel gas to a combustion section. The present invention relates to a gas control device in which a solenoid valve, a gas governor, and a second solenoid valve are sequentially arranged from a gas supply source toward a combustion section.

  For example, as shown in FIG. 5, this type of gas control device includes a main solenoid valve 7, a gas governor 8, and a temperature control electromagnetic wave in a gas passage 4 that supplies fuel gas from a fuse gas plug 2 to a gas burner 3 of a combustion device 5. The valves 9 are sequentially arranged. The gas burner 3 constitutes a combustion part of a combustion device 5 such as a gas oven. The combustion device 5 receives an ignition input from a user and opens and closes the main solenoid valve 7 and the temperature control solenoid valve 9. A control unit is provided for controlling the above.

  When the combustion device 5 is not used, the main solenoid valve 7 and the temperature control solenoid valve 9 are both closed. When the user inputs an ignition input to the combustion device 5, the control unit receives the ignition input. Sequentially opens the main solenoid valve 7 and the temperature control solenoid valve 9. Thereby, fuel gas is supplied to a gas burner and a gas burner is ignited by the flame of a pilot burner (for example, refer to patent documents 1).

Japanese Patent Publication No.62-19653

  By the way, the fuse gas plug 2 is provided with a fuse (not shown) for closing the flow path when the fuel gas is excessively discharged for safety reasons. Occasionally, when the solenoid valves 7 and 9 are opened, an instantaneous quasi-overflow state occurs in the gas flow path 4, and the fuse may malfunction. For this reason, an ignition error of the gas burner 3 may occur.

  The present inventor has intensively studied the main cause, and as a result, the diaphragm rubber of the gas governor 8 absorbs the fuel gas staying in the gas governor 8 during the non-use period of the combustion device 5, and thereby the main solenoid valve including the gas governor 8. 7 and the temperature control solenoid valve 9 has a negative pressure in the flow path (hereinafter referred to as an inter-valve region), and when the solenoid valves 7 and 9 are opened due to ignition, the inter-valve region becomes negative pressure. The fuel gas flows in suddenly, and an instantaneous quasi-overflow state occurs. This led to the finding that the fuse malfunctioned.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide means for preventing the occurrence of a momentary pseudo-overflow state of fuel gas at the time of ignition and preventing malfunction of a fuse. .

A gas control device according to the present invention is provided on a gas passage connected to a gas supply source having a fuse for preventing an excessive outflow of fuel gas to reach a combustion section, and on the gas supply source side of the gas passage. A first electromagnetic valve, a second electromagnetic valve disposed on the combustion section side of the gas passage, and the first electromagnetic valve and the second electromagnetic valve of the gas passage, A gas governor that adjusts pressure by opening and closing a governor valve seat in conjunction with a diaphragm rubber, and a control unit that controls opening and closing of the first and second solenoid valves based on an ignition input. a gas control device for said control unit, based on the ignition input, the second solenoid valve after again closed and from the closed state to the open state, the first solenoid valve from the closed state and the open state, then the configuration of the second solenoid valve to the closed state to the open state It is obtain things.

  When the combustion unit is not used, the first electromagnetic valve and the second electromagnetic valve are closed by the control unit, and the space between the valves becomes a sealed space where fuel gas stays. As time elapses, the diaphragm rubber of the gas governor absorbs the retained fuel gas, so that the pressure in the region between the valves becomes a negative pressure lower than the atmospheric pressure. This negative pressure increases according to the amount of fuel gas absorbed by the diaphragm rubber, and the amount of absorption increases with time. Therefore, the negative pressure in the gas governor increases as the non-use period of the combustion section increases.

  Then, when the user performs an ignition input to a combustion device or the like provided with the combustion unit in order to use the combustion unit, the control unit receives the ignition input and starts the second electromagnetic valve from the closed state. Open. As a result, the negative pressure in the intervalve region is released to atmospheric pressure. At this time, since the first electromagnetic valve is in the closed state, the release of the negative pressure in the inter-valve region does not affect the fuse on the gas supply source side. Next, the control unit changes the second electromagnetic valve from the open state to the closed state. As a result, the space between the valves becomes a sealed space again. Thereafter, the control unit changes the first electromagnetic valve from the closed state to the open state. As a result, the gas supply pressure is changed from the atmospheric pressure in the intervalve region, and the governor valve is interlocked with the diaphragm. Therefore, the position of the governor valve rises from the position when the intervalve region is in the atmospheric pressure state. The flow path is throttled. When the control unit changes the second electromagnetic valve from the closed state to the open state, the fuel gas is circulated from the gas supply source to the combustion unit. However, since the downstream side of the second electromagnetic valve is atmospheric pressure, Since the flow path in the gas governor is throttled by the governor valve, a momentary pseudo-overflow state does not occur and the malfunction of the fuse is prevented.

  The first solenoid valve opens and closes the flow of the fuel gas to the combustion section, and the second solenoid valve controls the flow rate of the fuel gas according to the required combustion amount of the combustion section. It is.

  According to the gas control device of the present invention, when the combustion part is ignited, the negative pressure generated in the inter-valve region is opened by opening the second electromagnetic valve on the combustion part side. When the solenoid valve 1 is opened, there is no sudden flow of gas into the inter-valve region, there is no instantaneous pseudo-overflow state, and the gas supply source fuse is A malfunction is prevented. Therefore, it is possible to prevent ignition errors in the combustion section. Further, since a rapid inflow of fuel gas into the negative pressure space does not occur, there is no large pressure fluctuation in the gas passage, and there is no adverse effect on the diaphragm rubber and parts in the gas passage.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
(First embodiment)
FIG. 1 shows a gas control apparatus 1 according to the first embodiment. The gas control device 1 is provided in a gas passage 4 extending from a fuse gas plug 2 (gas supply source) to a gas burner 3 (combustion unit). The gas burner 3 constitutes a combustion part of a combustion device 5 such as a gas oven, for example, and the gas control device 1 is configured integrally with the combustion device 5 as one that controls ignition and extinguishing of the gas burner 3, for example. The

  The fuse gas plug 2 is provided in a gas passage 4 through which fuel gas flows so that the gas passage 4 can be opened and closed. The user can control the supply of fuel gas to the combustion device 5 by opening and closing the fuse gas plug 2. The fuse gas stopper 2 is provided with a fuse 6 for preventing an excessive outflow of fuel gas. Although not shown in detail in FIG. 1, the fuse 6 is provided with a valve that moves in accordance with the flow rate of the fuel gas, and when the fuel gas flows out exceeding the gas flow rate required for the combustion of the gas burner 3. The valve moves to close the gas flow path, thereby preventing the fuel gas from overflowing. From such a fuse gas plug 2 to the combustion equipment 5 equipped with the gas control device 1, a gas passage 4 is constituted by, for example, a gas hose, and in the gas control device 1, the gas passage 4 is constituted by, for example, a gas pipe. ing.

  The gas control device 1 includes a main electromagnetic valve 7 (first electromagnetic valve), a gas governor 8, a temperature control electromagnetic valve 9 (second electromagnetic valve), and a main electromagnetic valve arranged in the gas passage 4 in the combustion device 5. It consists of the control part 10 which controls operation | movement of the valve 7 and the temperature control solenoid valve 9. FIG.

  The main solenoid valve 7 is disposed on the side of the fuse gas plug 2 of the gas passage 4, and an on-off type is used. When the gas burner 3 is ignited, the main solenoid valve 7 is opened by the control unit 10 to open the gas passage 4. As a result, the fuel gas is supplied to the gas burner 3 through the gas passage 4 through the opened fuse gas plug 2. When the gas burner 3 is extinguished, the main electromagnetic valve 7 is closed by the control unit 10 to shut off the gas passage 4 and cut off the supply of fuel gas to the gas burner 3.

  The temperature control electromagnetic valve 9 is a control valve disposed on the gas burner 3 side of the gas passage 4. When the gas burner 3 is ignited, the temperature control solenoid valve 9 is opened by the control unit 10 to open the gas passage 4, and fuel gas is supplied to the gas burner 3 through the gas passage 4 through the fuse gas plug 2. . Further, when the gas burner 3 is extinguished, the temperature control solenoid valve 9 is closed by the control unit 10 to block the gas passage 4. The temperature regulating solenoid valve 9 includes a type that changes the opening amount of the gas passage 4 stepwise according to a required combustion amount of the gas burner 3 and an on-off type that are not shown in FIG. The control unit 10 receives the output signal of temperature detection means such as a thermistor provided in the combustion device 5 and controls the temperature regulating solenoid valve 9 so that the combustion chamber of the combustion device 5 has a desired temperature. Thereby, the combustion amount of the gas burner 3 is controlled, and the temperature of the combustion device is adjusted.

The gas governor 8 is disposed between the main solenoid valve 7 and the temperature control solenoid valve 9 in the gas passage 4. As shown in FIG. 2, the gas governor 8 has a governor valve 14 fixed to a diaphragm rubber 12 provided in a housing 11 by a spring receiving plate 13, and the governor valve 14 passes through a governor valve seat 15. It is inserted into the hole 16, and the tip side thereof is enlarged in diameter so that it can be raised and lowered within the through hole 16. The diaphragm rubber 12 receives the urging force of the coil spring 17 via the spring receiving plate 13, whereby the diaphragm rubber 12 moves the governor valve 14 in a direction to open the through hole 16.
Note that the urging force of the coil spring 17 can be adjusted by a spring adjusting screw 19 from the opposite end of the spring receiving plate 13.

  On the other hand, as the primary pressure becomes higher than the secondary pressure, that is, as the pressure on the fuse gas plug 2 side becomes higher than the pressure on the gas burner 3 side, the diaphragm rubber 12 moves against the urging force of the coil spring 17. In conjunction with this, the governor valve 14 moves in a direction to close the through hole 16. Thus, the pressure adjustment of the fuel gas is performed by the opening degree of the through hole 16 by the governor valve 14 interlocked with the diaphragm rubber 12. Such a gas governor 8 is merely an example, and other known gas governors 8 may be used as the gas governor according to the present invention.

  The control unit 10 includes a microcomputer that controls the opening and closing of the main solenoid valve 7 and the temperature control solenoid valve 9 based on signals from the ignition input of the combustion device 5, a thermistor, and the like. As shown in FIG. 1, the combustion device 5 is provided with an ignition unit 18 for a user to perform ignition input. The control unit 10 receives an ignition input signal from the ignition unit 18, and receives a main electromagnetic signal. A control signal for opening and closing the valve 7 and the temperature control electromagnetic valve 9 is transmitted.

Hereinafter, the operation control of the main solenoid valve 7 and the temperature control solenoid valve 9 by the control unit 10 when the combustion device 5 is ignited will be described.
When the combustion device 5 is not used, that is, in a state where the gas burner 3 is extinguished, the control unit 10 turns off both the main electromagnetic valve 7 and the temperature control electromagnetic valve 9 and closes them. As a result, the gas passage 4 is blocked by the gas control device 1, and the fuel gas does not flow to the gas burner 3. Further, since both sides of the gas governor 8 are closed by the main solenoid valve 7 and the temperature control solenoid valve 9, the inter-valve region is a sealed space including the gas passage portion of the gas governor 8, and the fuel gas stays there.

  Then, as time elapses, the diaphragm rubber 12 of the gas governor 8 absorbs the staying fuel gas. Since the diaphragm rubber 12 absorbs the fuel gas with time, the pressure in the inter-valve region decreases according to the amount of fuel gas absorbed by the diaphragm rubber 12 and becomes a negative pressure lower than the atmospheric pressure.

  When the user performs ignition input in order to use the combustion device 5 as shown in FIG. 3 with the negative pressure in the inter-valve region in this way (S1), the control unit 10 In response to the ignition input, the temperature control solenoid valve 9 is turned on to change from the closed state to the open state (S2). As a result, the negative pressure is released to the atmospheric pressure in the intervalve region that has been sealed. At this time, since the main solenoid valve 7 is off and closed, the release of the negative pressure does not affect the fuse 6 of the fuse gas plug 2.

  Subsequently, the control unit 10 turns on the main electromagnetic valve 7 from the closed state to the open state (S3). As described above, since the negative pressure has already been released in the intervalve region, an instantaneous pseudo-overflow state does not occur. Further, a large pressure fluctuation does not occur in the gas passage 4 and the diaphragm rubber 12 in the housing 11 does not move abruptly. Therefore, the fuse 6 does not malfunction.

When the main solenoid valve 7 and the temperature control solenoid valve 9 are turned on and opened, the gas passage 4 from the fuse gas plug 2 to the gas burner 3 is opened, and fuel gas is supplied to the gas burner 3. The gas burner 3 is ignited by a flame or the like of a pilot burner (not shown).
As described above, according to the gas control device 1 according to the first embodiment, even if the pressure in the intervalve region is negative, since the negative pressure is released and then the ignition is started, the instantaneous quasi-overflow state Does not occur. Therefore, when the gas burner 3 is ignited, the gas passage 4 can be opened without malfunction of the fuse 6 of the fuse gas plug 2, and an ignition error of the gas burner 3 is prevented.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described.
The gas control device according to the second embodiment controls the operation of the main solenoid valve 7 and the temperature control solenoid valve 9 by the control unit 10 when igniting the combustion device 5 as compared with the one in the first embodiment. However, the other configurations are the same.

  That is, when the combustion device 5 is not used, the pressure in the gas governor 8 is reduced by the diaphragm rubber 12 absorbing the stagnant gas as in the first embodiment, and the gas governor 8 becomes the main electromagnetic. The pressure is negative with respect to the pressure in the gas passage 4 outside the valve 7 and the temperature regulating solenoid valve 9.

  When the user makes an ignition input in order to use the combustion device 5 as shown in FIG. 4 with the negative pressure in the inter-valve region as described above (S11), the control unit 10 In response to the ignition input, the temperature control electromagnetic valve 9 is turned on to change from the closed state to the open state (S12). Thereby, the negative pressure of the area | region between valves which was the airtight state is open | released. At this time, since the main electromagnetic valve 9 is off and closed, the release of the negative pressure of the gas governor 8 does not affect the fuse 6 of the fuse gas plug 2.

  Subsequently, the control unit 10 turns off the temperature control electromagnetic valve 9 and closes it from the open state (S13). As a result, the space between the valves becomes an atmospheric pressure sealed space, but the time until the main electromagnetic valve 7 is next opened is short, and during this time, the diaphragm rubber 12 is within the space between the valves. The fuel gas is not absorbed.

  Then, the control unit 10 turns on the main electromagnetic valve 7 from the closed state to the open state (S14). Thereby, the area between the valves becomes the gas supply pressure, the position of the governor valve 14 of the gas governor 8 is raised, and the governor valve 14 is throttled. Moreover, since the temperature control solenoid valve 9 is closed, the downstream side of the temperature control solenoid valve 9 is at atmospheric pressure.

Subsequently, the control unit 10 turns on the temperature control electromagnetic valve 9 to change from the closed state to the open state (S15). When the main solenoid valve 7 and the temperature control solenoid valve 9 are both turned on and opened, the gas passage 4 from the fuse gas plug 2 to the gas burner 3 is opened, and fuel gas is supplied to the gas burner 3. At this time, as described above, since the negative pressure in the inter-valve region is released, pressure fluctuation that causes the fuse 6 to operate in the gas passage 4 does not occur. The gas burner 3 is ignited by a flame or the like of a pilot burner (not shown).
As described above, also in the gas control apparatus 1 according to the second embodiment, when the gas burner 3 is ignited, the negative pressure is released even if the pressure in the intervalve region is negative, and the temperature regulating solenoid valve Since the gas passage up to 9 is shifted to ignition after the gas supply pressure is set, the gas passage 4 can be opened without malfunction of the fuse 6 of the fuse gas plug 2, so that an ignition error of the gas burner 3 is prevented. The

  In addition, this invention is not limited to the thing of each said Embodiment 1, 2, For example, the said temperature control solenoid valve 9 may be provided with two or more in parallel, and the temperature control solenoid valve 9 has two or more As for the opening operation at the time of ignition by the control unit 10, at least one temperature regulating electromagnetic valve 9 may perform the above-described valve opening operation.

It is a schematic diagram which shows the structure of the gas control apparatus 1 which concerns on the 1st Embodiment of this invention. 3 is a cross-sectional view showing a main configuration of a gas governor 8. FIG. It is a flowchart which shows the operation control of the main solenoid valve 7 and the temperature control solenoid valve 9 of the gas control apparatus 1 which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the operation control of the main solenoid valve 7 and the temperature control solenoid valve 9 of the gas control apparatus 1 which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the gas control apparatus in the combustion equipment connected to the fuse gas stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas control device 2 ... Fuse gas stopper (gas supply source)
3. Gas burner (combustion part)
4 ... Gas passage 5 ... Combustion equipment 6 ... Fuse 7 ... Main solenoid valve (first solenoid valve)
8 ... Gas governor 9 ... Temperature control solenoid valve (second solenoid valve)
DESCRIPTION OF SYMBOLS 10 ... Control part 12 ... Diaphragm rubber 14 ... Governor valve 15 ... Governor valve seat

Claims (2)

A gas passage connected to a gas supply source having a fuse for preventing an excessive outflow of fuel gas and leading to a combustion section, a first solenoid valve disposed on the gas supply source side of the gas passage, and the gas A second solenoid valve disposed on the combustion portion side of the passage, and the first solenoid valve and the second solenoid valve of the gas passage, and the governor valve is connected to the diaphragm rubber and A gas control device comprising: a gas governor that adjusts pressure by opening and closing a valve seat; and a control unit that controls opening and closing of the first electromagnetic valve and the second electromagnetic valve based on an ignition input,
The control unit on the basis of the ignition input, after the second solenoid valve from the closed state again closed to the open state, the first solenoid valve from the closed state to the open state, then the second A gas control device comprising a configuration for switching a solenoid valve from a closed state to an open state . The first solenoid valve opens and closes the flow of fuel gas to the combustion section,
The gas control device according to claim 1, wherein the second electromagnetic valve controls a flow rate of the fuel gas in accordance with a required combustion amount of the combustion section.

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