JP3578534B2 - Heating equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a burner for heating a heating container,
Temperature detection means for detecting the temperature of the heating container,
A heating device provided with supply amount adjusting means for automatically adjusting the supply amount of fuel supplied from the fuel supply source to the burner based on the detected temperature so as to maintain the temperature detected by the temperature detecting means at a set temperature; About.
[0002]
[Prior art]
Such a heating device is used, for example, for cooking. Using a standard heating container, the temperature of the food as an object to be heated in the heating container is brought to a desired target temperature, for example, a boiling state. In order to maintain the temperature, the set temperature is set, and the fuel supply amount to the burner is automatically adjusted so that the food in the heating container is maintained at a desired target temperature.
Therefore, for example, in the cooking of a pot, in which solid ingredients are boiled in liquid ingredients, even if the temperature of the ingredients drops and the boiling of the ingredients stops as additional ingredients are added, the boiling point of the ingredients stops. Since the fuel supply amount is automatically adjusted so as to boil, it can be conveniently used.
[0003]
[Problems to be solved by the invention]
By the way, in such a heating device, when the change in the temperature detected by the temperature detecting means is small, the adjustment of the fuel supply amount by the supply amount adjusting means is not executed, that is, the detected temperature for the adjustment of the fuel supply amount by the supply amount adjusting means. There is a dead zone of change.
Therefore, for example, in the cooking of a pot, when the added amount of the food is small and the detected temperature change is within the dead zone, the food may not be reboiled.
[0004]
Also, such a heating device, using a standard heating container, for example, to set the set temperature so that the food is maintained in a boiling state, when using a heating container other than the standard heating container, Depending on the properties of the heating container used, for example, the shape of the heating container and the amount of heat storage, there is a case where compatibility is not obtained.
For example, when using a heating container having a shape in which the contact area between the detection unit of the temperature detection unit and the heating container is larger than that of the standard heating container, the temperature detection unit uses a standard heating container. Since the detected temperature is higher than when the food is being boiled, the detected temperature may reach the set temperature before the food boils, and the food may not be able to boil.
Alternatively, when using a heating container whose heat storage amount is larger than the standard heating container, even if foodstuffs are added and boiling stops, the detected temperature does not decrease due to the large heat storage amount of the heating container, or Since the amount of the decrease is small, it is possible that the food cannot be boiled.
[0005]
The present invention has been made in view of such circumstances, and has as its object to maintain the object to be heated in a heating container at a desired target temperature in a state where the fuel supply amount to the burner is automatically adjusted. Another object of the present invention is to enable the object to be heated to be maintained at the target temperature when the temperature of the object to be heated becomes lower than the target temperature and cannot be maintained at the target temperature.
[0006]
[Means for Solving the Problems]
According to the configuration of the first aspect, when the supply state is switched to the regulated supply state by the supply state switching unit, the fuel supply amount to the burner is maintained by the supply amount adjustment unit such that the temperature detected by the temperature detection unit is maintained at the set temperature. Is automatically adjusted and switched to the unadjusted supply state by the supply state switching means, the fuel is supplied to the burner from the fuel supply source without adjusting the supply amount by the supply amount adjustment means.
Therefore, when the temperature of the object to be heated in the heating vessel is lower than the desired target temperature and cannot be maintained at the target temperature in the state of being used in the adjusted supply state, the supply state is set. When switching to the unadjusted supply state is performed by the switching means, the fuel supply state from the fuel supply source to the burner is in a state in which the supply amount is not adjusted by the supply amount adjustment means, so that the temperature of the object to be heated is raised to the target temperature. be able to.
Further, by closing the on-off valve, the state is switched to the regulated supply state, and the fuel from the fuel supply source is adjusted after the supply amount is adjusted through the supply amount adjusting section of the supply amount adjusting means without passing through the bypass. , Supplied to the burner. On the other hand, by opening the on-off valve, the state is switched to the unadjusted supply state, and the fuel from the fuel supply source has a large flow resistance of the supply amount adjustment section, so that the supply amount adjustment section hardly passes, and most of the fuel is bypassed. The gas is supplied to the burner through the path, that is, supplied to the burner without adjusting the supply amount by the supply amount adjustment unit.
Therefore, the present invention can be implemented with a simple modification simply by adding the detour and the on-off valve, so that the present invention can be implemented at low cost.
Further, in both the regulated supply state in which the on-off valve is closed and the unregulated supply state in which the on-off valve is opened, the main control valve controls the intermittent supply of fuel to the burner and the regulation of the supply amount. It can be carried out.
Therefore, not only when the temperature of the object to be heated becomes lower than the target temperature, but also when the temperature of the object to be heated becomes higher than the target temperature and cannot be maintained at the target temperature in the state of use in the adjusted supply state. Even when the state is reached, the on-off valve is opened to switch to the unregulated supply state, and the main control valve is adjusted to reduce the fuel supply amount, thereby lowering the temperature of the object to be heated and maintaining the target temperature. be able to.
In addition, for example, when using a heating container of a shape such that the contact area between the detection unit of the temperature detection unit and the heating container to be used is smaller than the standard heating container, the temperature detection unit is a standard heating container. Since a lower temperature is detected than when the heating container is being used, the temperature of the object to be heated may be higher than the target temperature and may not be maintained at the target temperature.
Therefore, when the temperature of the object to be heated is lower than the target temperature and cannot be maintained at the target temperature in the state where the temperature of the object to be heated is lower than the target temperature, and the temperature of the object to be heated is lower than the target temperature. Whenever the temperature becomes too high to maintain the target temperature, the on-off valve is opened to switch to the unregulated supply state, and the fuel is controlled by the main control valve so that the temperature of the object to be heated is maintained at the target temperature. Since the supply amount can be adjusted, the practicality can be further improved.
[0007]
According to the configuration described in claim 2, the liquid of the liquid expansion type thermosensor expands and contracts in response to a temperature change of the heating container, and operates the diaphragm. The valve body is operated by the operation of the diaphragm, The fuel supply to the burner is automatically adjusted. Incidentally, there is a case where the temperature detecting means is constituted by a thermistor, and the supply amount adjusting means is constituted by an electric control type in which a valve for adjusting a fuel supply amount is electrically controlled based on detection information of the thermistor.
Compared with the case of the electric control type, the temperature detecting means is constituted by a liquid expansion type thermosensor, and the supply amount adjusting means is constituted by a diaphragm which is operated by expansion and contraction of the liquid of the liquid expansion type thermosensor. In addition, when the apparatus is provided with a valve element operated by the diaphragm, there is an advantage that electrical control becomes unnecessary. On the other hand, since the valve body is operated based on the expansion and contraction of the liquid of the liquid expansion type thermosensor, there is a drawback that the dead zone becomes larger than that of the electrically controlled type.
Therefore, the temperature detecting means is constituted by a liquid expansion type thermo sensor, and the supply amount adjusting means is provided with a diaphragm operated by expansion and contraction of the liquid of the liquid expansion type thermo sensor, and a valve element operated by the diaphragm. In the case of configuring, it is particularly effective to implement the present invention.
[0011]
According to the third aspect of the present invention, the extinguishing or incomplete combustion occurs during both the use in the regulated supply state and the use in the unregulated supply state, and the extinguishment is safe. When the means is activated and the main regulating valve is closed, the supply of fuel to the burner is cut off.
Therefore, the present invention can be implemented without impairing safety.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a cooking stove will be described with reference to the drawings.
As shown in FIGS. 1 and 2, an annular gas burner 2 is disposed inside a casing 1 having an opening on an upper surface with the annular gas burner 2 facing the opening, and a pot A as a heating vessel is placed. Is placed on the upper surface of the casing 1, and the heat-sensitive portion 4 s of the liquid inflatable thermosensor 4 as the temperature detecting means T for detecting the temperature at the bottom of the pot A is located inside the annular gas burner 2. It is provided.
[0013]
As shown in FIG. 1, a fuel gas supply path 6 for connecting a main plug 5 as a fuel supply source and a gas burner 2 is provided inside the casing 1 so that the fuel gas from the main plug 5 is supplied to the gas burner 2. It is composed.
In the fuel gas supply path 6, the supply amount of the fuel gas supplied to the gas burner 2 through the fuel gas supply path 6 is set based on the detected temperature so that the detection temperature of the liquid expansion type thermosensor 4 is maintained at the set temperature. A supply amount adjusting unit Va of the supply amount adjusting means V for automatically adjusting is provided, and the intermittent supply and supply of the fuel gas to the gas burner 2 are provided on the fuel gas supply path 6 at a position higher than the installation position of the supply amount adjusting unit Va. An instrument plug 7 as a main control valve for adjusting the amount is interposed.
[0014]
The supply state of the fuel gas from the main plug 5 to the gas burner 2 is controlled in an adjusted supply state in which the supply amount is adjusted by the supply amount adjusting means V, and is supplied without adjusting the supply amount in the supply amount adjusting means V. There is provided a supply state switching means C for switching to an unregulated supply state. The supply state switching means C is provided with a bypass 8 for supplying the fuel gas from the main plug 5 to the gas burner 2 without passing through the supply amount adjusting unit Va, and an opening / closing valve 9 interposed in the bypass 8. It is configured to switch between the unregulated supply state and the regulated supply state by opening and closing the on-off valve 9.
The upstream side of the detour 8 is connected to a location between the installation location of the instrument plug 7 and the installation location of the supply amount control unit Va in the fuel gas supply path 6, and the downstream side is connected to the gas burner 2.
[0015]
As shown in FIG. 2, an opening / closing valve operating tool 10 for opening / closing the opening / closing valve 9 and an instrument plug operating tool 11 for operating the instrument plug 7 are positioned on the front surface of the casing 1. It is provided.
[0016]
The operation configuration of the ignition / extinguishing of the gas burner 2 will be described.
When the instrument plug operating tool 11 is pushed from the middle position, which is the fire-extinguishing position, to the pushing position, the instrument tap 7 opens to supply fuel gas to the gas burner 2 and the limit switch 12 Is closed and the igniter 13 is turned on, the ignition plug 14 is activated and the gas burner 2 is ignited.
When the pushing operation is released, the instrument plug operating tool 11 projects beyond the intermediate position to the projecting position by the urging force, but is excited by the electromagnetic coil 16 by the electromotive force of the thermocouple 15 heated by the ignition of the gas burner 2. Even after the pressing operation is released, the valve plug 7 is kept open against the urging force, so that the combustion of the gas burner 2 is continued.
[0017]
Note that, if an ignition mistake or extinguishment or incomplete combustion occurs during combustion after ignition, the appliance plug 7 is automatically closed by the closing urging force due to a decrease in the electromotive force of the thermocouple 15.
[0018]
By rotating the instrument stopper operating tool 11 at the projecting position, the opening degree of the instrument stopper 7 is adjusted, and the supply amount of the fuel gas is adjusted.
When the instrument plug operating tool 11 at the projecting position is pushed to the intermediate position, which is the fire extinguishing position, the instrument plug 7 closes and the fuel gas supply to the gas burner 2 is cut off, extinguishing the fire.
Reference numeral 17 in FIG. 1 denotes a dry battery for driving the igniter 13.
[0019]
Accordingly, while the gas burner 2 continues burning, the instrument plug 7 is kept open, and the extinguishing safety means S for closing the instrument plug 7 when the gas burner 2 burns out or burns out when combustion is incomplete occurs. It comprises a pair 15 and an electromagnetic coil 16.
[0020]
Next, the liquid inflatable thermosensor 4 will be described.
As shown in FIG. 3, the liquid inflatable thermosensor 4 includes a disc-shaped heat-sensitive portion 4 s filled with a working liquid (hereinafter, sometimes abbreviated as a working liquid), a capillary 4 c, Are further provided in a state where they are communicated with each other. Further, the capillary 4c is connected to the supply amount adjusting unit Va so that a diaphragm 25 described later is operated by expansion and contraction of the working fluid filled therein. It is composed.
The heat-sensitive portion 4s is attached to the upper end of the support portion 18 having an upward urging force, and is configured to be in contact with the bottom of the pot A placed on the goto 3 by the urging force.
[0021]
Next, the supply amount adjusting unit Va will be described with reference to FIG.
The liquid expansion type thermosensor 4 is provided inside a valve box 24 having an inlet 21, an outlet 22, and a valve seat 23 and a valve hole 27 in the middle of a flow path from the inlet 21 to the outlet 22. A diaphragm 25 operated by expansion and contraction of the hydraulic fluid, and a valve body 26 which is moved by the diaphragm 25 toward and away from the valve seat 23 to open and close a valve hole 27 are provided.
[0022]
The diaphragm 25 and the round bar 28 are connected to each other by screwing an adjusting screw receiver 29 attached to the diaphragm 25 and a male thread formed at one end of the round bar 28. Further, the round rod 28 and the dial shaft 30 rotatably supported with respect to the valve box 24 are provided with a pin attached to the end of the round rod 28 and a length extending in the axial direction formed at the tip of the dial shaft 30. The engagement with the notch-shaped notch prevents the relative movement in the circumferential direction and allows the relative movement in the axial direction. Reference numeral 31 in the drawing denotes a temperature setting operation tool for rotating the dial shaft 30.
[0023]
The valve body 26 is supported so as to be movable in the axial direction with respect to the round bar body 28, and the valve body 26 and the diaphragm 25 are connected by a coil spring 32. A projection 28a for receiving the valve 26 is formed on the outer periphery of the round bar 28.
[0024]
The capillary 4c of the liquid inflatable thermosensor 4 is connected to the diaphragm 25 so that the working fluid of the liquid inflatable thermosensor 4 is filled in the diaphragm 25.
[0025]
That is, as the temperature of the pot A rises, the working fluid of the liquid expansion type thermosensor 4 expands, the diaphragm 25 expands, and the valve body 26 is gradually pushed in a direction to approach the valve seat 23, and eventually. , Abuts the valve seat 23 to close the valve hole 26 to stop the flow of the fuel gas. The coil spring 32 allows the diaphragm 25 to expand beyond the state where the valve body 26 is brought into contact with the valve seat 23.
Then, as the temperature of the pot A decreases, the working fluid of the liquid inflatable thermosensor 4 contracts, the diaphragm 25 contracts, and the valve body 26 is pulled in a direction away from the valve seat 23, and the valve seat When the valve body 26 separates from the valve seat 23 and the valve body 26 separates from the valve seat 23, the valve hole 26 opens and fuel gas flows.
[0026]
When the temperature of the food in the pot A reaches the desired target temperature, the length of the coil spring 32 is adjusted by rotating the temperature setting operation tool 31 so that the valve body 26 comes into contact with the valve seat 23. That is, the distance between the valve body 26 and the valve seat 23 is adjusted. That is, the set temperature is set by rotating the temperature setting operation tool 31. The separation and contact between the valve body 26 and the valve seat 23 are repeated at the set temperature, that is, the supply amount adjusting unit Va is opened and closed, and the fuel gas flows or stops through the valve hole 27. Or
[0027]
Even if the supply amount adjustment unit Va closes and the flow of the fuel gas through the valve hole 27 stops once, the supply amount adjustment unit Va opens and the flow of the fuel gas through the valve hole 27 is reduced. When restarted, the gas burner 2 needs to be ignited.
Therefore, although not shown, the supply amount control unit Va is configured to continue the combustion of the pilot burner with respect to the gas burner 2 even if the valve is closed and the flow of the fuel gas through the valve hole 27 is stopped, or In order to continue the combustion with the minimum combustion amount in the gas burner 2, a bypass flow path in which fuel gas always flows from the inlet 21 to the outlet 22 is provided.
[0028]
The temperature setting operation tool 31 is provided inside the casing 1, and the setting of the set temperature by the temperature setting operation tool 31 is performed by the manufacturer using a standard pot A. is there.
[0029]
The supply amount adjusting means V is configured to operate by expansion and contraction of the working fluid of the liquid inflatable thermosensor 4 and does not require an electrical control device. It can be constituted only by the amount adjusting section Va.
[0030]
When the on-off valve 9 is in the closed state, the fuel gas does not flow through the bypass 8 and is supplied to the gas burner 2 after the supply amount is adjusted through the supply amount adjusting unit Va. When the on-off valve 9 is in the open state, the fuel gas is supplied to the gas burner 2 almost through the supply amount adjusting unit Va and almost through the bypass 8 because the supply amount adjusting unit Va has a large flow resistance. That is, the fuel gas is supplied to the gas burner 2 without the supply amount being adjusted by the supply amount adjustment unit Va, and the fuel gas is in the unadjusted supply state.
[0031]
The on-off valve 9 is opened and closed by the on-off valve operating tool 10 to switch between the unadjusted supply state and the regulated supply state. An "automatic mode" corresponding to the operation position of the on-off valve operating tool 10 to be in the closed state, and a "manual mode" corresponding to the operating position of the on-off valve operating tool 10 to open the on-off valve 9 respectively. It is displayed.
In the following description, the adjusted supply state may be described as “automatic mode” and the unadjusted supply state may be described as “manual mode”.
[0032]
Next, a method of operating the stove configured as described above will be described.
It is assumed that the set temperature is set to a temperature at which the temperature of the water in the pot A can be maintained at 100 ° C. (that is, a boiling state), for example, for cooking a pot.
When used in the “automatic mode”, the operator operates the on-off valve operating device 10 to the “automatic mode” position. In this case, the amount of combustion of the gas burner 2 can be adjusted as desired by the operator by operating the instrument stopper operating tool 11.
Then, the inside of the pot A is automatically maintained in a boiling state, and in the state in which the boiling state is maintained, even if food is added and the boiling state is stopped, the pot A is automatically adjusted to be in the boiling state again.
By the way, when the additional input amount of the foodstuff is small, the decrease amount of the temperature of the pot A is small, that is, the contraction amount of the working fluid of the liquid expansion type thermosensor 4 is small, and the valve body 26 is separated from the valve seat 23. The diaphragm 25 may not be contracted until the operation is performed. In this case, since the state in which the pot A does not boil continues, the operator operates the on-off valve operating tool 10 to the "manual mode" position. Also in this case, the combustion amount of the gas burner 2 can be adjusted by the instrument stopper operating tool 11.
[0033]
When used in the "manual mode", the operator operates the on-off valve operating tool 10 to the "manual mode" position. In this case as well, the amount of combustion of the gas burner 2 can be adjusted as desired by the operator by operating the instrument plug operating tool 11.
In the case of a dish whose target temperature is different from that of a hot pot, or when it is difficult to maintain the temperature of the foodstuff at the target temperature due to a difference in properties from a standard pot, it is used in the “manual mode”.
[0034]
[Another embodiment]
Next, another embodiment will be described.
{Circle around (1)} In the above embodiment, the temperature detecting means T is constituted by the liquid inflatable thermosensor 4, and the supply amount adjusting means V is controlled by the diaphragm 25 operated by the expansion and contraction of the working fluid of the liquid inflatable thermosensor 4. And the valve body 26 operated by the diaphragm 25 is illustrated, but various configurations are possible as the specific configuration of each of the temperature detection unit T and the supply amount adjustment unit V.
For example, the temperature detecting means T is composed of a thermistor, the supply amount adjusting means V is an electromagnetic on-off valve serving as a supply amount adjusting section Va interposed in the fuel gas supply path 6, and the on-off valve is used as detection information of the thermistor. May be configured by a control device that performs opening / closing control based on the control information.
[0035]
{Circle around (2)} In the above embodiment, the case where the set temperature is set to a temperature at which the temperature of the water in the pan A can be maintained at 100 ° C. (that is, a boiling state) for cooking of the pan is described. The set temperature can be appropriately set according to a target dish such as a stewed dish or a tempura dish.
[0036]
{Circle around (3)} In the above-described embodiment, the case where the present invention is applied to a cooking stove has been illustrated, but the present invention is applicable to various heating devices other than the stove.
[0037]
Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.
[Brief description of the drawings]
FIG. 1 is a block diagram of a stove. FIG. 2 is a front view of a stove. FIG. 3 is a cross-sectional view of a supply amount adjusting unit.
2 Burner 4 Liquid expansion type thermo sensor 5 Fuel supply source 6 Fuel supply path 7 Main control valve 8 Detour 9 Open / close valve 25 Diaphragm 26 Valve element A Heating container C Supply state switching means S Falling-off safety means T Temperature detection means V Supply Amount adjusting means Va Supply amount adjusting unit

Claims (3)

A burner (2) for heating the heating vessel (A);
Temperature detection means (T) for detecting the temperature of the heating container (A);
A supply for automatically adjusting the supply amount of fuel supplied from the fuel supply source (5) to the burner (2) based on the detected temperature so that the temperature detected by the temperature detecting means (T) is maintained at the set temperature. A heating device provided with an amount adjusting means (V),
The supply state of the fuel from the fuel supply source (5) to the burner (2) includes an adjusted supply state in which the supply amount is adjusted by the supply amount adjusting means (V) and the supply amount adjusting means ( Supply state switching means (C) for switching to an unregulated supply state in which the supply amount is not adjusted in V) ,
A supply amount adjusting section (Va) of the supply amount adjusting means (V) is provided in a fuel supply path (6) for supplying fuel from the fuel supply source (5) to the burner (2);
The supply state switching means (C) includes a detour (8) that supplies fuel from the fuel supply source (5) to the burner (2) without passing through the supply amount adjustment unit (Va). An on-off valve (9) interposed in the detour (8) is provided, and is configured to switch between the unregulated supply state and the adjusted supply state by opening and closing the on-off valve (9),
A main control valve (7) for interrupting the supply of fuel to the burner (2) and adjusting the supply amount is located on the fuel supply path (6) at a position farther from the place where the supply amount adjustment section (Va) is installed. ) Is provided,
The upstream side of the detour (8) is connected to a location between the installation location of the main control valve (7) and the installation location of the supply amount adjustment unit (Va) in the fuel supply path (6). Heating equipment. The temperature detecting means (T) is constituted by a liquid expansion type thermosensor (4);
A diaphragm (25) operated by expansion and contraction of the liquid of the liquid expansion type thermosensor (4), and a valve operated by the diaphragm (25) to adjust a fuel supply amount; The heating device according to claim 1, comprising a body (26). While the burner (2) continues burning, the main control valve (7) is kept open, and when the burner (2) burns out or incomplete combustion occurs, the main control valve (7) is maintained. 3. The heating device according to claim 1, further comprising a disappearing safety means (S) for closing the valve .

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