JP2000014570A - Gas fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop the supply of gaseous fuel to a gas burner by using an overheat preventive switch having a built-in fuse to be fused at a specific temp. and utilizing the function of this fuse as it is when the oil of an oil tank rises to a temp. extremely higher than the sensing temp. of the fuse. SOLUTION: The overheat preventive switch 23, which incorporates the fuse which breaks at the fusing temp. Tm lower than an abnormal temp. range when oil 20 for deep-fried food enters the hardly controllable abnormal temp. range in excess of a cooking temp. range, is installed on the outside of the oil tank 21. A temp. gradient adjusting member 27 having a prescribed temp. gradient is interposed between the front end member 28 of the overheat preventive switch 23 and the outer flank 24 of the oil tank 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fryer used for cooking fried foods by heating an oil tank containing oil for frying with a gas burner using gas as a fuel.

[0002]

2. Description of the Related Art As shown in FIG. 3, the inventors of the present invention set a temperature of oil 20 in a gas fryer 25 in which an oil tank 21 containing oil 20 for frying is heated by a gas burner 22 from below. The temperature sensor 33 that senses the oil tank 2
One has already proposed a gas fryer 25 (prior art) which is mounted on a frame 26 so as to contact the outer surface 24 of one, in particular an inclined surface.

When the gas fryer 25 is used, the temperature sensor 33 comes into contact with the oil tank 21 just by dropping and setting the oil tank 21 in the frame 26 when the oil 20 is replaced. There is an advantage that every time the sensor is replaced, the trouble of setting the temperature sensor is eliminated.

[0004]

However, as one type of the temperature sensor 33, an overheat prevention switch incorporating a fuse that blows in a certain sensitive temperature range is used, and the temperature of the oil 20 is much higher than the temperature of the fried food. When the gas fryer 25 is used only in a mode in which the overheat prevention switch is operated to stop the supply of the fuel gas supplied to the gas burner 22 when the gas fryer 25 is heated to It turns out that the problem needs to be solved.

First, it is a condition that the fuse used in the above-described embodiment should be excellent in accuracy and durability. However, if the fuse satisfies such conditions, the sensitive temperature range of the fuse is limited. Only those that normally operate around 200 ° C. have been put to practical use. On the other hand, for some reason, the flame of the gas burner continues to burn and the oil 2 in the oil tank 21
When the temperature of 0 is raised to an uncontrollable abnormal temperature (abnormal temperature) which is higher than the temperature of the deep-fried food, a flame runs through the oil 20 if the fire approaches. Usually, this temperature is around 350 ° C.

Therefore, in the overheat prevention switch,
A tip member provided at the tip of the overheat prevention switch is connected to the oil tank 21 so that the fuse transmits heat to the fuse and directly contacts an object to be overheated which is to be prevented from overheating.
When the overheat prevention switch is intended to function by contacting the outer slope 24 of the
It operates in the process of rising from 0 ° C. to 300 ° C. to stop the supply of fuel gas to the gas burner, that is, to stop the supply of fuel gas even when the gas fryer is used normally. That happens.

Therefore, the present inventors have found that the sensitive temperature of the fuse incorporated in the overheat protection switch is significantly lower than the control limit temperature at which the oil temperature must not be higher than a predetermined value from the viewpoint of fire prevention. As a result of intensive studies with the aim of bringing the overheat prevention switch of the structure into contact with the outer surface of the oil tank and exerting its alarm function, it is said that a specific member may be substantially interposed between the fuse and the oil tank. After finding the fact, the present invention was completed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to use an overheat prevention switch having a built-in fuse sensitive at a specific temperature, and when the oil in the oil tank rises to a temperature significantly higher than the sensitive temperature of the fuse, the overheat protection switch is used. An object of the present invention is to provide a gas fryer having a structure in which information is issued from a prevention switch to control means of a fuel gas supply circuit for a gas burner to stop supply of fuel gas.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method in which the temperature of oil for frying in a fryer oil tank heated by a gas burner enters an abnormal temperature range higher than the cooking temperature of frying. In a gas fryer adapted to shut off a fuel gas supplied to the gas burner by sensing an overheat prevention switch incorporating a fuse that blows at a temperature significantly lower than the abnormal temperature range, A temperature gradient adjusting member is provided between a tip member attached to a tip portion of the overheat prevention switch and an outer surface of the fryer oil tank in order to transmit heat of the oil tank to the fuse while being installed outside the fryer oil tank. The means to make it do is adopted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the gas fryer according to the present invention will be described in detail with reference to the drawings. As in the prior art shown in FIG. 3, the fryer 25 is mounted on a casing-like or frame-like frame 26. Gas burner 2
2, a square pot type or round pot type oil tank 21 installed above the gas burner 22 in the same manner as described above, and the oil tank 21 is installed so as to indirectly contact the outer surface 24, particularly the inclined surface, of the oil tank 21. And an overheat prevention switch 23.

An oil 20 for fried food is put in the oil tank 21, and the oil 20 is heated by the flame of the gas burner 22 through the oil tank 21. The heating temperature of the oil 20 is controlled within a predetermined range according to the food material, and a temperature sensor (not shown) for controlling the temperature is also provided on the frame 26 similarly to the overheat prevention switch 23.

As shown in FIG. 1, the overheat prevention switch 23 includes a switch casing 29 having a bottomless box shape, a protection member 31 slidably inserted into the switch casing 29 on the front plate 29a side, and 200 ℃
A switch body 30 containing a fuse (not shown) that blows in the vicinity, a tip member 28 exposed at the tip of the switch body 30 and transmitting the heat of the object to be measured to the fuse, and a tip member 28 The protection member 31
, The protection member 31 is constantly urged toward the front plate 29a side of the switch casing 29 so that the temperature gradient adjustment member 27 is fixed to the outside surface of the oil bath 21 by the screw 33. And a spring 32 that comes into contact with the spring 24.

The protection member 31 has a function of sliding the switch main body 30 in a predetermined space in a diagonal direction in cooperation with the switch casing 29, and has the outer shape of the tip member 28 and the temperature gradient adjusting member 27. By making it much larger than the external shape, the switch body 3
It has a protection function that protects it from being damaged by an external load.

Further, in the switch body 30, a molded body made of an electrically defective conductor such as synthetic resin or synthetic rubber includes:
A terminal 34 of a safety circuit (not shown) is installed. The fuse is inserted in the middle of the circuit, and the tip member 28 is in contact with the fuse.

The temperature gradient adjusting member 27 is usually made of a metal having a good thermal conductivity from the viewpoint of quickly transmitting to the fuse that the temperature of the oil 20 in the oil tank 21 approaches the control limit temperature. The length and the outer surface area or volume are determined by experiments to satisfy the conditions described below.

The overheat prevention switch 23 is connected to the gas fryer 2
5, the sensor casing 29 is fixed to the frame 26 of the gas fryer 25 with the bottom thereof facing downward, and the overheat prevention switch is set so that the temperature gradient adjusting member 27 is perpendicular to the inclined outer surface 24 of the oil tank 21. Tilt.

When the gas fryer 25 equipped with the overheat prevention switch 23 is used as described above, when an abnormal situation occurs, the heat of the oil 20 is transferred to the oil tank 2.
1. A temperature range in which the temperature is sequentially transmitted to the temperature gradient adjusting member 27, the protection member 31, and the tip member 28 and becomes uncontrollable higher than the temperature range in which the food is cooked as fried food, that is, an abnormal temperature range, for example, its control limit temperature Tc. , The contact surface temperatures T1, T2, T3, and T4 of each of the members drop,
At the boundary between the tip member 28 and the fuse, the temperature reaches the fuse fusing temperature Tm.

Since the materials of the members other than the temperature gradient adjusting member 27 cannot be easily exchanged, the material, length and outer surface area of the temperature gradient adjusting member 27 are determined by experiments so as to obtain the temperature gradient shown in FIG. .

When the fuse reaches the fusing temperature Tm, it naturally blows and cuts off in the course of the extinguishing safety circuit to stop the supply of fuel gas to the gas burner 25.
Therefore, an oil fire in the oil tank 21 can be prevented.

The present invention can be carried out by partially modifying the above-described embodiments within a range that does not significantly impair the effects of the present invention while following the fundamental technical concept thereof. For example, the switch casing 29 may be formed as a pair of rod-shaped members, and the rod-shaped members may pass through the protection member 31 so that the member 31 can be slid obliquely in a predetermined space.

[0021]

As described in detail above, the present invention uses an overheat prevention switch having a built-in fuse sensitive to a specific temperature, and the oil in the oil tank becomes abnormally high at a temperature significantly higher than the sensitive temperature of the fuse. When the temperature rises to above, an excellent effect that the function of the fuse is exerted as it is and the supply of the fuel gas to the gas burner can be surely stopped is exhibited.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an overheat prevention switch according to the present invention.

FIG. 2 is a diagram illustrating the operation of a temperature gradient adjusting member.

FIG. 3 is a schematic sectional view of a gas fryer according to the prior art and the present invention.

[Explanation of symbols]

 Reference Signs List 20 oil 21 oil tank 22 gas burner 23 overheat prevention switch 24 outer surface 25 gas fryer 26 frame 27 temperature gradient adjusting member 28 tip member 29 protective member Tc abnormal temperature Tm fusing temperature

Claims (4)

[Claims] When the temperature of oil for frying (20) in an oil tank (21) heated by a gas burner (22) enters an abnormal temperature range higher than a cooking temperature range for frying, the temperature is significantly higher than the abnormal temperature. In a gas fryer (25) adapted to shut off fuel gas supplied to the gas burner in response to an overheat prevention switch (23) incorporating a fuse that blows at a low temperature (Tm), the overheat prevention switch ( A tip member (28) attached to a tip of the overheat prevention switch (23) for transferring heat of the oil tank (21) to the fuse while installing the oil tank (23) outside the oil tank (21). A gas fryer characterized in that a temperature gradient adjusting member (27) is interposed between the outer surface (24) and the outer surface (24). 2. A gas fryer according to claim 1, wherein said temperature gradient adjusting member is fixed to an overheat prevention switch. 3. An oil tank (21) is provided with a gas fryer (2).
The overheat prevention switch (23) is connected to the oil tank (2) so that the temperature gradient adjusting member (27) comes into contact with the oil tank (21) when the device is dropped into the frame (26) and set.
The gas fryer according to claim 2, wherein the gas fryer is urged toward the inclined surface side of (1). 4. The gas according to claim 2, wherein a protection member (31) having an outer shape larger than the outer shape is provided between the overheat prevention switch (23) and the temperature gradient adjusting member (27). Flyer.