JPH0718346Y2 - Heating cooker - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field and Outline of the Invention] The present invention relates to a heating cooker used for a table stove or a fryer, and is used for heating a dish with an extremely small heat “Toraki”. The gas burner as a heat source can be stably burned.

[Prior Art and Problem] As a conventional cooking device, there is, for example, the one shown in FIG.

Proportional valve (11) in the gas circuit (10) to the gas burner (1)
Is inserted, and an ignition device (14) for igniting the gas burner (1) is provided near the gas burner (1),
Further, a thermal power setting device (4) for setting the thermal power of the gas burner (1) and an ignition switch (40) are connected to the control device (2) for controlling the ignition device (14) and the proportional valve (11). .

In this case, the opening of the proportional valve (11) is adjusted by operating the thermal power setting device (4), whereby the amount of gas supplied to the gas burner (1) is changed and the pan (3) is heated to a predetermined thermal power. Be heated.

And in the above, as in the case of cooking the stew by heating the pan (3) with a "melting fire", and maintaining the tempura oil put in the pan (3) in a heat-retaining state, the gas burner ( When it was necessary to burn 1) with extremely low heat, the opening of the proportional valve (11) was narrowed down to control this, and thermal power was controlled.

However, in order to realize the above-mentioned low heat combustion, the proportional valve (11)
When the opening degree of is to be made extremely small, it is necessary to control the proportional valve (11) while keeping it in a state close to fully closed. Therefore, when the control current applied to the proportional valve (11) is slightly disturbed or the gas pressure in the upstream gas circuit changes, the proportional valve (11) may be closed excessively. In such a case, the gas burner may be closed. (1) may be extinguished. From this, the above-mentioned conventional one has a problem that it is difficult to stably burn the gas burner (1) with the above-mentioned low heat.

As a means for solving such inconvenience, JP-A-61-276628
It is conceivable to employ a configuration in which a bypass circuit that bypasses the proportional valve is provided and an orifice for setting the minimum flow rate is inserted in this bypass circuit as disclosed in Japanese Patent Laid-Open Publication No. 2000-242242. In this case, under the minimum flow rate condition, the gas amount to the gas burner is set to the minimum flow rate by fully closing the proportional valve, and this flow rate value becomes stable.

However, in this configuration, when the opening of the proportional valve changes in the gas amount control state of the proportional valve, the bypass circuit is affected by the gas pressure due to the change in the opening of the proportional valve. On the other hand, since the amount of gas to the gas burner is determined by the flow rate from the bypass circuit and the flow rate controlled by the proportional valve, the total flow rate in the state of adjusting the gas amount by the proportional valve is not stable due to the above influence, and the gas amount control The accuracy is insufficient.

The present invention has been made in view of the above point, and is a "proportional valve (11) arranged in a gas circuit (10) to a gas burner (1)".
And a heating cooker equipped with a thermal power setting device (4) for setting the thermal power of the gas burner (1) ", a stable combustion of the gas burner (1) can be ensured even when the gas burner (1) is burned by low heat. At the same time, it is an object to stabilize the total gas flow rate in the gas amount adjustment state to improve the accuracy of gas amount control.

[Technical Means] A technical means of the present invention for solving the above-mentioned problem is to provide an “opening / closing valve (15) disposed upstream of a proportional valve (11) in a gas circuit (10) and the proportional valve. A bypass circuit (16) that bypasses the on-off valve (15) on the upstream side of (11), and a gas that is arranged in the bypass circuit (16) and that corresponds to the minimum combustion amount of the gas burner (1) is supplied. The orifice (17) to be operated and a set value monitoring means (5) for detecting that the set value of the thermal power setting device (4) has dropped to the minimum value and outputting a low heat signal are provided, and the set value monitoring means (5) When the on-off valve (15) is closed by the low heat signal issued, the proportional valve (11) is held at a predetermined opening. "

[Operation] The above technical means operates as follows.

When the heat setting device (4) is not set to the minimum state (when performing normal cooking), no low heat signal is output from the set value monitoring means (5), and the opening / closing is closed by the low heat signal. The valve (15) is kept open. Therefore, the on-off valve (15) provided in the gas circuit (10) on the upstream side of the proportional valve (11) is maintained in the open state, whereby sufficient gas can flow downstream from the on-off valve (15). Side proportional valve (11).

Then, when the thermal power setting device (4) is operated in this state, the opening of the proportional valve (11) changes according to the operation amount in the same manner as the conventional one, and the gas supply amount to the gas burner (1) is changed. The amount of combustion of the gas burner (1) can be controlled by this adjustment, and normal cooking can be performed. At this time, since the proportional valve (11) is located on the most downstream side, the adjustment of the gas amount by changing the opening of the proportional valve (11) is changed only by the opening of the proportional valve (11). Unlike the conventional one disclosed in No. 3, the fluctuation of the gas amount due to factors other than the change in the opening of the proportional valve will not occur. Therefore, the accuracy of the gas amount control is improved.

Next, when performing a stewed dish or the like (when burning the gas burner (1) in the minimum combustion state), the thermal power setting device (4) may be set to the minimum state. Then, a low heat signal is output from the set value monitoring means (5) that detects that the set value of the thermal power setting device (4) has fallen to the minimum value, whereby the on-off valve (15) is closed. , The proportional valve (11) is maintained at a predetermined opening. As a result, gas is supplied to the proportional valve (11) side only via the bypass circuit (16) that bypasses the on-off valve (15).

Then, since the bypass circuit (16) is provided with the orifice (17) which fixedly supplies the gas in an amount required to maintain the gas burner (1) in the minimum combustion state, the orifice (17) is provided. ), The gas burner (1) burns in the minimum combustion state (melting fire), whereby stewed dishes and the like can be performed.

[Effect] The present invention has the following unique effects.

Since the gas burner (1) can be maintained in the minimum combustion state by the supply gas from the orifice (17) having a constant opening degree, the gas burner (1) is controlled while maintaining the proportional valve (11) in a state close to fully closed. 2) is maintained in the minimum combustion state, the combustion state of the gas burner (1) during the minimum combustion is stable.

Further, the gas amount control by the proportional valve (11) is changed only by the opening degree of the proportional valve (11), so that the accuracy of the gas amount control is improved as compared with the conventional one.

[Embodiment] Next, an embodiment of the present invention described above will be described in detail with reference to the drawings.

As shown in FIG. 1, in the gas circuit (10) to the gas burner (1) that heats the pan (3), the main valve (18), the on-off valve (15), and the proportional valve (11) from the upstream side thereof. In this order, the orifice (17) is inserted in the bypass circuit (16) connecting the upper and lower flow paths of the on-off valve (15). Further, the orifice (17) is set to an opening degree required to secure a gas flow rate required to burn the gas burner (1) in the minimum combustion state.

Next, a control circuit that controls each of the above components will be described.

The output of the start switch (61) is applied to a T flip-flop (hereinafter abbreviated as TFF) (62).
The output of (62) controls the opening / closing of the main valve (18).

The output of the thermal power setting device (4) and the output of the reference value setting device (45) are compared by the comparator (44).
The minimum value that can be set by the thermal power setting device (4) is set in 5). Further, in this embodiment, the reference value setting device (45) and the comparator (44) correspond to the setting value monitoring means (5) described in the above-mentioned technical means section.

Next, the output of the comparator (44) is applied to the on-off valve (15) to open and close it, and further the output of the comparator (44) is applied to the transistor (46). The relay (52) is inserted in the collector circuit of the transistor (46). The normally open output contact (53) is inserted in a circuit connecting the output part of the thermal power setting device (4) and the proportional valve drive circuit (56). The normally-closed output contact (54) of the relay (52) has a valve opening signal (50 mA in this embodiment) necessary for maintaining the opening degree of the proportional valve (11) to the extent that it does not become a resistance to gas passage. Is inserted in the circuit connecting the output portion of the auxiliary valve opening degree setting device (58) for outputting the electric current of (1) and the proportional valve drive circuit (56).

In this case, when the heat power setting device (4) is operated in the high heat direction, the resistance value of the heat power setting device (4) decreases, and the output of the heat power setting device (4) increases at this time. Is applied to the proportional valve drive circuit (56) to increase the opening of the proportional valve (11). Further, in the normal state, the output of the thermal power setting device (4) is larger than the output of the reference value setting device (45), and the comparator (44) is in a state where the "H" signal is output. As a result, the open / close valve (15) is maintained in the open state, the transistor (46) is maintained in the conductive state, the normally closed output contact (54) of the relay (52) is opened, and the normally open output contact (53) is opened. ) Is closed, whereby the setting value of the thermal power setting device (4) is maintained in a state of being applied to the proportional valve drive circuit (56).

Now, when the start switch (61) is operated in the above state,
The main valve (18) is opened by the signal of the TFF (62), and a circuit (not shown) operates to drive the ignition device (13), whereby the gas burner (1) is maintained in a combustion state. In this state, the output of the thermal power setting device (4) is applied to the proportional valve drive circuit (56) as described above, and the output of the proportional valve drive circuit (56) causes the proportional valve (1
1) is opened. That is, the gas supply amount to the gas burner (1) is controlled according to the set value of the thermal power setting device (4), and the combustion amount thereof is controlled.

Next, when the heat power setting device (4) is operated to the low heat side to cook the stewed food and the heat power setting device (4) is in the minimum setting state, the output of the heat power setting device (4) is set to the reference value. Bowl (45)
, Which results in a "L" signal from the comparator (44). Then, the on-off valve (15) is closed and gas is supplied to the downstream side only through the orifice (17). Also, when the "L" signal is output from the comparator (44), the relay (52) is deactivated and the normally open output contact (53)
, The output of the thermal power setting device (4) is not applied to the proportional valve drive circuit (56), and the normally closed output contact (54) is closed instead. As a result, the output of the auxiliary valve opening degree setting device (58) is applied to the proportional valve drive circuit (56), and the proportional valve (11) is maintained at a constant valve opening degree. Then, since the orifice (17) is set to the opening degree required to secure the gas flow rate corresponding to the minimum combustion of the gas burner (1), the gas burner (1) is stable in the minimum combustion state (melting fire). To burn. That is, stewed foods can be cooked.

Needless to say, the present invention can also be used in the case where it is necessary to burn the gas burner (1) with low heat in order to keep the oil for tempura in the pan (3) in a heat-retaining state.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. In the figure, (1) ... Gas burner (4) ... Thermal power setting device (5) ... Set value monitoring means (10) …… Gas circuit (11) …… Proportional valve (15) …… Open / close valve (16) …… Bypass circuit (17) …… Orifice

Claims (1)

[Scope of utility model registration request] A heating cooker comprising a proportional valve (11) arranged in a gas circuit (10) to the gas burner (1) and a heat power setting device (4) for setting the heat power of the gas burner (1). In the gas circuit (10), an on-off valve (15) disposed upstream of the proportional valve (11) provided on the most downstream side of the gas circuit (10) and the on-off valve (15) disposed upstream of the proportional valve (11). A bypass circuit (16) that bypasses 15), an orifice (17) arranged in the bypass circuit (16) and supplying an amount of gas corresponding to the minimum combustion amount of the gas burner (1), and a thermal power setting device. Setting value monitoring means (5) for detecting that the setting value of (4) has dropped to the minimum value and outputting a low heat signal is provided, and the on-off valve (15) is opened by the low temperature signal output by the setting value monitoring means (5). A cooker that closes and holds the proportional valve (11) at a predetermined opening.