JPS6339560Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas cooker that enables a wide range of cooking from low-temperature cooking to high-temperature cooking.

In general, in the type of cooking, the primary fermentation temperature is around 27℃ during the yeast fermentation stage before baking bread.
A low secondary fermentation temperature of 34 to 40 degrees Celsius is required.
It requires a high temperature of around 400℃. For example, during the secondary fermentation stage of the yeast, the temperature is 40°C.
If the temperature exceeds 50°C, the bacteria will die, so accurate temperature control is required.

However, in conventional gas cookers, burner combustion was controlled by turning on and off electromagnetic valves in response to the temperature in the cooking chamber, so the temperature in the cooking chamber varied greatly between the upper and lower limits, making it impossible to maintain a constant temperature. There are also burner combustion controls using liquid expansion valves, but this method can only control the high temperature range.

Therefore, the application and use of gas cookers is limited to baking and boiling, and there is a problem that low-temperature cooking such as fermentation of yeast cannot be performed.

The present invention completely changes the image of conventional gas cookers by controlling the combustion output of the burner through a proportional solenoid valve.One embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a cooking chamber 2 with gas burners 3 and 4 installed above and below, and a support 5 for the food to be cooked A such as a gridiron placed between these gas burners 3 and 4. There is an air supply port 6 on the top, and an exhaust port 7 on the top.
They each have the following.

8 is a pilot burner for the upper gas burner 3; 9 is a pilot burner for the lower gas burner 4; at least the lower pilot burner 9 is located outside the cooking chamber 2 at a position that does not interfere with the ignition of the gas burner 4; The chamber 2 is designed not to be affected by heat. 10 divides the cooking chamber 2 and the combustion chamber 11 of the pilot burner 9,
A heat insulating partition wall 12 prevents the heat of the pilot burner 9 from affecting the cooking chamber 2, and 12 is an auxiliary exhaust port provided above the pilot combustion chamber 11.

On the other hand, reference numeral 13 is a gas path connected to a stop solenoid valve 14 on the upstream side and a proportional solenoid valve 15 on the downstream side. Supply paths 16 and 17 are branched, and supply paths 18 and 19 to the upper and lower gas burners 3 and 4 are branched from the downstream side of the proportional solenoid valve 15.

20 is a temperature detection sensor that detects the temperature of the cooking chamber 2; 21 is an electric controller that receives a signal from the temperature detection sensor 20 and controls the coil current of the proportional solenoid valve 15; 22 and 23 are supply paths 18 and 16 to the upper gas burner 3 and the pilot burner 8.
This is a gas valve that interlocks with the other.

FIG. 2 shows the gas control characteristics of the proportional solenoid valve 15. When the coil current I exceeds _I3 , the valve is fully opened and the maximum gas amount _Q3 flows, and in the current range of _I2 to _I3 , _Q2 to Q ₃
The gas amount changes proportionally between the two, and when the current value decreases below _I2 , the gas amount _Q2 becomes constant. Further, when the current further decreases to I ₁ , the valve is fully closed.

In the above configuration, the gas valves 22 and 23 are now opened, and the upper and lower gas burners 3 and 4 are connected to the various fire burners 8 and
If the fire is ignited at step 9, the food to be cooked A will be heated uniformly from both the upper and lower sides. The temperature inside the cooking chamber 2 can be set arbitrarily by controlling the amount of gas to the burners 3 and 4 between _Q2 and _Q3 , and the amount of gas to the burners 3 and 4 can be adjusted according to the set temperature. Since the temperature is fixed, there is no temperature variation.

Furthermore, when performing low-temperature cooking, the gas valves 22 and 23
is closed, the upper gas burner 3 and pilot burner 8 are extinguished, and the temperature setting by the electric controller 21 is set to the minimum.

Here, the lower gas burner 4 performs on-off combustion at the lowest limit in the stable combustion region. That is, on-off combustion occurs under the gas amount Q ₂ shown in Figure 2. At this time, the pilot burner 9 burns continuously to ensure safety against extinguishing accidents and delayed flame transfer of the gas burner 4, but the heat of the pilot flame of the pilot burner 9 affects the cooking chamber 2 due to the partition wall 10. It is configured so that it does not give

More specifically, the electric controller 21 receives a signal from the temperature detection sensor 20 under the lowest set temperature and sets the gas amount of the proportional solenoid valve 15 to _Q2 . Even with this, if the temperature in cooking chamber 2 is in the process of rising, the current will be
I ₁ , the valve is fully closed and the gas burner 4 is extinguished. When the gas burner 4 is extinguished, the temperature of the cooking chamber 2 tends to decrease, and when the current increases by a certain amount from _I1 , the gas burner 4 is ignited again.

The cooking chamber 2 is kept at a low temperature by such low-output on-off combustion of the gas burner 4.

During the on-off combustion, the combustion amount of the gas burner 4 is at the lowest limit where incomplete combustion and backup fire do not occur, so temperature variations are very small.

As mentioned above, this cooker allows temperature adjustment over a very wide range from low to high temperatures without any variation, so it is possible to reliably perform not only high-temperature cooking but also low-temperature cooking such as yeast fermentation. It is possible.

Next, a specific example of a proportional solenoid valve will be explained with reference to FIGS. 3 to 5.

In FIG. 3, a valve 25 is loosely attached to one end of a plunger 24 that moves up and down proportionally in response to electromagnetic force generated by an electromagnetic force coil (not shown). valve 2
5 is arranged to face the valve seat 26, and is normally pressed against the valve seat 26 by a spring (not shown) (when no current is flowing through the coil). Inside the valve seat 26, the upper part contacts the valve 25,
An inner valve seat 30 that is pushed up from the lower part by a spring 27 and has a diaphragm 29 held in the middle part by a diaphragm holding fitting 28 and is movable up and down.
is located. One or more bypass nozzles 31 are opened in the inner valve seat 30 .

Next, this operation will be explained. The state shown in Fig. 3 shows that the electromagnetic coil is not energized, and the plunger 24 overcomes the coil spring 27 and brings the valve 25 into close contact with the valve seat 26, preventing gas from flowing from chamber B to chamber C. I'm here. As the coil current is gradually increased, the plunger 24 and the valve 25 are pulled upward by the electromagnetic force, but at the same time, the inner valve seat 30 is also pushed upward by the coil spring 27 with its upper part touching the valve 25. Move to (Figure 4). At this time, the valve 25 is separated from the valve seat 26 but is sealed by the diaphragm 29, so the gas flows through the bypass nozzle 31.
The flow rate is regulated by the diameter of the tube. Here, since the area of the bypass nozzle 31 is sufficiently smaller than the area of the valve seat 26, if the valve 25 is separated from the valve seat 26 and opened even a little, it is sufficient to flow the minimum flow rate. Therefore, while the inner valve seat 30 is in contact with the valve 25, the gas flow rate is determined only by the bypass nozzle 31 and remains constant regardless of valve displacement.

Next, when the plunger 24 moves further and the valve 25 separates from the inner valve seat 30, the valve 25 and the inner valve seat 30
The gas flow rate is proportionally controlled according to the opening degree of the (FIG. 5).

As is clear from the above description, the gas cooker of the present invention includes a cooking chamber, a gas burner disposed in the cooking chamber, a pilot combustion chamber, and a combustion chamber disposed in the pilot combustion chamber that continuously burns during cooking. A cooking chamber is provided in the gas path to the gas burner, and includes a fire burner and a partition wall that partitions the cooking chamber and the pilot combustion chamber so that the heat of the pilot burner does not affect the cooking chamber. It has a proportional solenoid valve that performs proportional control on the gas amount from the minimum combustion amount to the maximum combustion amount of the gas burner in response to temperature, and performs on/off control when the gas amount is less than the minimum combustion amount of the gas burner. Therefore, (1) When the gas burner is extinguished and only the pilot burner is burning continuously, the heat of the pilot burner is blocked by the bulkhead and does not increase the temperature in the cooking chamber, so The on/off control of the proportional solenoid valve makes it possible to reliably control the low temperature required for yeast fermentation, and the pilot burner continues to burn even when the proportional solenoid valve performs on/off control. This ensures safety against burner fire extinguishing accidents and delayed flame transfer.
The amount of gas at that time is set to the minimum combustion amount of the gas burner, so the temperature variation (pulsation) in the cooking chamber is very small, and the yeast on the surface of the leaven will not die, resulting in stable fermentation without failure. It has the feature of making it possible.

(2) During high-temperature cooking, the proportional solenoid valve automatically increases the amount of gas to match the load, allowing for pulsation-free temperature control, allowing you to get a nice focus on grilled fish, for example. has.

(3) Since it is possible to automatically switch from on/off control to proportional control using the proportional solenoid valve, it is possible to automatically switch from on/off control to proportional control, so it is possible to perform tasks that were impossible with conventional gas cookers, such as from yeast fermentation to bread baking. It has the feature of enabling a series of cooking from low-temperature cooking to high-temperature cooking.

(4) Even when the gas burner is frequently turned on and off during low-temperature cooking, continuous combustion does not require the pilot burner to be ignited, so there is no risk of gas burner extinguishing accidents or delayed flame transfer. Secured.

(5) Even if the pilot burner is continuously burning, the partition wall prevents the heat of the pilot burner from affecting the cooking chamber, making it possible to control the low temperature necessary for yeast fermentation. Since the pilot burner is not extinguished, there is no need for a pilot burner ignition sequence, and the on-time of the gas burner is correspondingly shortened, so the temperature control accuracy in the cooking chamber is also high.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a gas cooker showing an embodiment of the present invention, Fig. 2 is a characteristic diagram of controlling the gas amount by a proportional solenoid valve, and Fig. 3 is a sectional view of the main parts of the proportional solenoid valve. 4 and 5 are explanatory diagrams of the operation. 2... Cooking room, 3, 4... Gas burner, 13...
...Gas path, 15...Proportional solenoid valve.

Claims (1)

[Scope of utility model registration request] a cooking chamber; a gas burner disposed in the cooking chamber;
a pilot combustion chamber; a pilot burner disposed in the pilot combustion chamber that burns continuously during cooking; and a cooking chamber and a pilot combustion chamber arranged so that the heat of the pilot burner does not affect the cooking chamber. and a gas path to the gas burner is proportionally controlled from the minimum combustion amount to the maximum combustion amount of the gas burner in response to the set temperature of the cooking chamber; A gas cooker equipped with a proportional solenoid valve that turns on and off when the amount of combustion is below the minimum combustion amount.