JP2011005217A - Fryer heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil and impurity from attaching to a temperature sensor for a high limiter for detecting the temperature of a heating coil, to improve the durability of the temperature sensor for a high limiter, to ease the assembling of the temperature sensor for a high limiter and to reduce its material cost.SOLUTION: In a fryer heater 1 including a metal pipe 2 having a meandering part 21 and a rising part 22, a heating coil 3 inserted into the meandering part 21, and an inorganic insulator 4 with which the gap between the meandering part 21 and the heating coil 3 is filled, the coil pitch distance of the heating coil 3 in the top section 21c of the meandering part 21 is set to be larger than the coil pitch distances of other sections. A temperature sensor 6 for a high limiter is located in the meandering part 21 between a base terminal section 21d and a first returning section 21e.

Description

  The present invention relates to a heater used in an electric heating fryer for producing deep-fried foods such as tempura and fries.

  This type of fryer heats oil by disposing a sheathed heater in an oil tank that stores cooking oil (hereinafter simply referred to as “oil”). The sheathed heater is formed, for example, by inserting a heat generating coil such as a nichrome wire in the center of a metal pipe such as a stainless steel tube, and filling a gap between the metal pipe and the heat generating coil with an inorganic insulator such as magnesium oxide powder. And the oil temperature sensor for detecting the temperature of the oil in an oil tank is attached to the inside of an oil tank (for example, refer patent documents 1, 2). A high limiter thermal sensor for detecting the temperature of the heating coil is externally attached to the metal pipe.

  On the other hand, there is also known a sheathed heater in which a heating portion is bent in a meandering manner (see Patent Documents 3 and 4).

JP 2000-166774 A (paragraph number [0031]) JP 2007-125145 A (paragraph number [0113]) JP 59-175582 (FIG. 1) Japanese Utility Model Publication No. 6-5184 (FIG. 7)

  However, in the above fryer where the oil temperature sensor is installed inside the oil tank, the oil temperature sensor is directly exposed to the oil, so oil and impurities adhere to the oil temperature sensor, and the secular change and durability due to corrosion, damage, etc. It was a cause of problems such as decline in sex. In addition, even in a fryer where a heat sensor for high limiter for detecting the temperature of the heating coil is attached to the metal pipe, oil and impurities adhere to the heat sensor, and the heat sensor is easily corroded or damaged. There was a problem that the performance decreased.

  On the other hand, if an oil temperature sensor or a heat sensor for high limiter is provided inside the heater, the above-mentioned problems can be solved. However, if the thermal sensor for the high limiter is to be placed inside the heater, it is necessary to place the thermal sensor for the high limiter as close as possible to the central part in the length direction where the heating coil is at the highest temperature. In addition to being complicated, there is a problem in that the cost increases because it is necessary to extend the wire of the thermal sensor for the high limiter for a long time. In particular, the above problem is significant in a sheathed heater in which the heating portion is formed in a meandering manner many times.

  The present invention has been made to solve such a problem with respect to a fryer heater having a heating portion formed in a meandering shape, and its purpose is to detect the temperature of a heating coil. Providing a fryer heater that prevents oil and impurities from adhering to high-limiter thermal sensors and improves durability, facilitates the work of incorporating high-limiter thermal sensors, and reduces material costs There is.

  The flyer heater according to the present invention, as described in claim 1, is formed by folding back in a meandering shape, a meandering portion whose front end portion is closed, and a rising portion raised from a base end portion of the meandering portion, A heater for a fryer that includes a heating coil that is folded back at the tip of the meandering part and leads out from the rising part, and the coil pitch interval of the heating coil in the tip of the meandering part is set at other locations. And a high-limiter thermal sensor for detecting the temperature of the heating coil is disposed inside the meandering portion between the base end portion and the first turn-up portion. Features.

According to the flyer heater having the above-described configuration, the high limiter thermal sensor is provided inside the heater (specifically, inside the meandering portion in the range from the base end portion to the first folded portion). Even when the heater is disposed in the oil in the oil tank, it is possible to prevent oil and impurities from adhering to the high-limiter thermal sensor.
In addition, since the coil pitch interval of the heating coil in the tip portion of the meandering portion is set larger than the coil pitch interval in other locations, the vicinity of the tip portion of the meandering portion where the heating coil is the highest temperature and other locations Thus, the temperature of the heating coil can be accurately detected without arranging the high limiter thermal sensor near the tip of the meandering portion. Thereby, the certainty of protection of a heater can be improved.
Furthermore, since the insertion depth of the thermal sensor for the high limiter from the rising part to the meandering part is small, it is possible to easily and quickly assemble the thermal sensor for the high limiter, and the thermal sensor for the high limiter. Since a short wire is sufficient, the cost can be reduced.

  The flyer heater according to the present invention includes, as described in claim 2, a meandering portion formed by folding back in a meandering shape, rising portions raised from both ends of the meandering portion, and the inside of the meandering portion. And a heater for a fryer having lead wires respectively led out from both of the rising portions, the coil pitch interval of the heating coils in the central portion in the longitudinal direction of the meandering portion is set to A thermal sensor for a high limiter for detecting the temperature of the heating coil is disposed inside the meandering portion between any one of the end portions and the first turn-up portion. It is characterized by that.

According to the flyer heater having the above configuration, the high-limiter thermal sensor is provided inside the heater (specifically, inside the meandering portion in the range from either end to the first folded portion) Even when the fryer heater is disposed in the oil in the oil tank, it is possible to prevent oil and impurities from adhering to the high-limiter thermal sensor.
In addition, the coil pitch interval of the heat generating coil located in the central portion in the length direction when viewed from each end of the meandering portion is set larger than the coil pitch interval of the other portions, so that the heat generating coil has the highest temperature. The temperature difference between the central part in the longitudinal direction of the part and the other parts can be reduced, and the temperature of the heating coil can be adjusted without arranging a high-limiter thermal sensor near the central part in the longitudinal direction of the meandering part. It can be detected accurately. Thereby, the certainty of protection of a heater can be improved.
Furthermore, since the insertion depth of the thermal sensor for the high limiter from the rising part to the meandering part is small, it is possible to easily and quickly incorporate the thermal sensor for the high limiter, and the thermal sensor for the high limiter. Since a short wire is sufficient, the cost can be reduced.

  In each of the above fryer heaters, a configuration in which an oil temperature sensor for detecting the temperature of oil in the oil tank is incorporated in the rising portion can be employed. According to this, oil and impurities can be prevented from adhering to the oil temperature sensor as well as the heat sensor for the high limiter, and corrosion of the oil temperature sensor can be prevented and durability can be improved. .

  According to the present invention, it is possible to prevent oil and impurities from adhering to the high-limiter thermal sensor, so that the durability of the high-limiter thermal sensor can be improved. In addition, it is possible to easily and quickly incorporate the high-limiter thermal sensor into the meandering portion. Furthermore, since the strands of the high-limiter thermal sensor can be short, the cost can be reduced.

(A) is a top view of the heater for fryer which shows 1st Embodiment of this invention. (B) is an enlarged view of the vicinity of the central portion in the length direction of the heating coil before being folded in half. It is a front view which fractures | ruptures and shows a part of heater for the said fryer. It is a side view of the heater for the fryer. It is a perspective view of the heater for fryer which shows 2nd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

A fryer heater according to a first embodiment of the present invention will be described with reference to FIGS.
In the flyer heater 1 according to the first embodiment, a heating coil 3 is inserted in the center or near the center of a metal pipe 2 such as a stainless steel tube, and an inorganic insulator 4 such as magnesium oxide powder is placed in the gap between the metal pipe 2 and the heating coil 3. It is a sheathed heater that is filled.
The metal pipe 2 has a meandering portion 21 formed by folding back in a meandering manner, and a rising portion 22 raised integrally from a base end portion 21 d of the meandering portion 21. The meandering portion 21 is flattened to have an elliptical cross section so that it can be easily bent, and is bent in a meandering manner in the length direction so that the contact area with the oil in the oil tank can be as large as possible. . In this embodiment, it forms in the form which has the some linear part 21a and the circular arc part 21b which connects the ends of adjacent linear part 21a, 21a. The straight portions 21a may be formed so as to be parallel to each other, but in the present embodiment, the straight portion 21a closest to the base end portion 21d and the straight portion 21a closest to the distal end portion 21c are parallel to each other. On the other hand, the folding direction (bending angle) in the arc portion 21b is set in a range exceeding 180 °. Thereby, while making the installation space of the heater 1 in an oil tank as small as possible, the contact area with oil can be enlarged as much as possible. It is desirable that the meandering portion 21 is formed by being folded twice or more. In this case, two or more arc portions 21b are provided. The leading end portion 21c of the meandering portion 21 is closed so that oil or the like does not enter. In the present embodiment, the meandering portion 21 and the rising portion 22 are formed integrally from the metal pipe 2, but the meandering portion 21 and the rising portion 22 are formed separately and joined to each other. You may comprise. Moreover, each linear part 21a which comprises the meander part 21 does not need to be formed in linear form literally.

  The rising portion 22 has a circular cross section, and is bent in a substantially horizontal direction at an upper portion. A flange 10 is provided at an upper end portion of the rising portion 22, and the fryer heater 1 is attached to the oil tank via the flange 10. However, the attachment means is not limited to the flange type, and may be a screw type or other attachment means. In the present embodiment, the rising portion 22 (therefore, the base end portion 21d of the meandering portion 21) is positioned on the center line in the heater width direction in plan view so that the heater 1 is stable when installed in the oil tank. (See FIG. 1A). The outer surfaces of the rising portion 22 and the meandering portion 21 of the metal pipe 2 are baked at about 1000 ° C. to remove impurities for the purpose of hygiene.

  As shown in FIG. 1 and FIG. 2, the heating coil 3 is formed in a double fold shape by winding a nichrome wire in a coil shape and folding the central portion in the longitudinal direction, and is inserted into the center of the meandering portion 21 or near the center. The folded portion 3 a of the coil 3 is built in the closed end portion 21 c of the meandering portion 21. As shown in FIG. 2, the two lead wires 9, 9 connected to both ends of the heating coil 3 are led out from the rising portion 22. In the present embodiment, the meandering portion 21 functions as a heating portion. However, the heating coil 3 may be extended inside the rising portion 22 so that the portion functions as a heating portion.

  In the fryer heater 1 having such a configuration, as shown in FIG. 2, oil in an oil tank (not shown, the same applies hereinafter) in which the fryer heater 1 is disposed at a predetermined position inside the metal pipe 2. An oil temperature sensor 5 such as a thermocouple for detecting the temperature of the heater and a high-limiter thermal sensor 6 such as a thermocouple for detecting the temperature of the heating coil 3 itself are incorporated.

  In the oil temperature sensor 5, a thermocouple is coupled by plasma welding or the like at the distal end portion of the strand 7 inserted into the rising portion 22 of the metal pipe 2. When the fryer heater 1 is disposed at a predetermined depth in the oil tank, the oil temperature sensor 5 is, for example, 10 to 80 mm from the upper surface of the meandering portion 21 of the fryer heater 1 immersed in the oil tank, preferably Is set so as to exist at a height of about 20 to 50 mm, more preferably about 30 mm.

  When the coil pitch of the heat generating coil 3 is wound at an equal pitch over the entire length, when current is passed through the lengthwise central portion 3b and the folded portion 3a (lengthwise central portion 3b) generates heat, The said part becomes the highest temperature. In order to protect the heater 1, it is necessary to know the temperature of this part accurately. However, when the thermal sensor 6 for the high limiter is inserted into the meandering portion 21 from the rising portion 22 and is arranged at the highest temperature portion, the strand 8 of the thermal sensor 6 for the high limiter is substantially the same as the entire length of the meandering portion 21. The same length is required, and it takes time to insert the meandering portion 21 into the meandering part 21 and increases the cost.

Therefore, in order to reduce the temperature difference between the folded portion 3a of the heat generating coil 3 and other portions as much as possible even when an electric current is passed through the heat generating coil 3, the coil pitch interval in the folded portion 3a of the heat generating coil 3 is set to the same. It is set to be larger than the coil pitch interval at other points. As shown in FIG. 1B, the coil pitch interval of the central portion 3b in the longitudinal direction of the heat generating coil 3 before being folded in half is made larger in advance than the coil pitch interval of the other portions, so that the heat generating coil 3 Is provided in the meandering portion 21 so that the folded portion 3a is located at the tip 21c of the meandering portion 21.
Then, the high limiter thermal sensor 6 in which the thermocouple is coupled by plasma welding or the like at the distal end portion of the strand 8 is connected to the first folded portion from the proximal end portion 21d side of the meandering portion 21 where the rising portion 22 is formed. It is provided inside the meandering portion 21 up to 21e. Specifically, in the present embodiment, the high limiter thermal sensor 6 is built in the straight line portion 21 a adjacent to the rising portion 22 from the rising portion 22 of the metal pipe 2. The thermal sensor 6 for the high limiter is disposed in the linear portion 21a so as to be close to the heating coil 3 but not in contact with the heating coil 3.

  The extended end portion 9a of the lead wire 9 of the heating coil 3 led out from the rising portion 22, the extended end portion 7a of the strand 7 of the oil temperature sensor 5, and the extended end portion of the strand 8 of the high-limiter thermal sensor 6. 8a is connected to a controller (not shown, the same applies hereinafter). Thereby, when the temperature of the oil detected by the oil temperature sensor 5 becomes higher than the predetermined temperature, the energization to the heat generating coil 3 is cut off, and when the oil temperature becomes lower than the predetermined temperature, the on / off control of energizing the heat generating coil 3 is performed. By doing so, the temperature of the oil is adjusted to a predetermined temperature (for example, 180 to 230 ° C.). Further, when the temperature of the heater 1 itself rises abnormally, such as when the oil tank is blown empty, the high-limiter thermal sensor 6 detects this, so that the power supply to the heating coil 3 is cut off. It is.

As described above, the oil temperature sensor 5 and the high limiter thermal sensor 6 are built in the rising portion 22 and the meandering portion 21 of the metal pipe 2 of the fryer heater 1, respectively, so that the fryer heater 1 is in the oil layer in the oil tank. The oil temperature sensor 5 and the high limiter thermal sensor 6 can be prevented from adhering oil and impurities in the oil tank, and therefore the oil temperature sensor 5 and the high limiter thermal sensor 6 can be prevented from being corroded and durable. Can be improved.
In particular, since the high-limiter thermal sensor 6 is disposed in the nearest straight line portion 21a adjacent to the rising portion 22 of the meandering portion 21, the placement work can be simplified. Since 8 is short, cost can be reduced.

Next, a fryer heater according to a second embodiment of the present invention will be described with reference to FIG.
In the flyer heater 1 of the second embodiment, the metal pipe 2 has a meandering portion 21 and two rising portions 22 and 23 that rise substantially vertically from both end portions 21d1 and 21d2 of the meandering portion 21, respectively. The lead wires 9, 9 connected to both ends of the heating coil 3 are inserted into one rising portion 22 and the other rising portion 23, respectively.

  In 2nd Embodiment, the coil pitch space | interval of the length direction center part 3b of the heat generating coil 3 is previously made larger than the coil pitch space | interval of a part other than that (refer FIG.1 (B)), and the heat generating coil 3 is made. When provided in the meandering portion 21, the lengthwise central portion 3b of the heat generating coil 3 is in the lengthwise central portion 21f of the meandering portion 21 (the central portion in the extending direction of the meandering portion 21 as viewed from the end portions 21d1 and 21d2). To be located. That is, the coil pitch interval at the longitudinal center portion 21f of the meandering portion 21 is larger than the coil pitch interval at other locations. As a result, even when an electric current is passed through the heat generating coil 3, the temperature difference between the central portion 21f in the longitudinal direction of the meandering portion 21 and other portions can be reduced, and the temperature can be made uniform over the entire length. .

  In the second embodiment, the high limiter thermal sensor 6 for detecting the temperature of the heating coil 3 is provided inside the meandering portion 21 between one end portion 21d1 and the first folded portion 21e1. Specifically, the high-limiter thermal sensor 6 is built in the nearest straight portion 21 a adjacent to one rising portion 22 of the meandering portion 21. Of course, the high limiter thermal sensor 6 may be provided on the other end 21d2 side. In this case, the inside of the meandering portion 21 between the other end 21d2 and the first folded portion 21e2 (for example, the other end 21d2). Is provided in the nearest straight line portion 21a) adjacent to the rising portion 23. Other configurations such as disposing the oil temperature sensor 5 in the rising portion 22 or 23 are the same as those in the first embodiment.

  Also in the flyer heater 1 of the second embodiment, it is possible to prevent oil and impurities in the oil tank from adhering to the high limiter thermal sensor 6 and to improve the durability of the high limiter thermal sensor 6. be able to. Moreover, the arrangement | positioning operation | work of the thermal sensor 6 for high limiters can be simplified, and it is the same as that of the case of 1st Embodiment that it is sufficient to use the shortest strand 8 as much as possible.

  In the first and second embodiments, the example in which the present invention is applied to the single-phase heater has been described. However, the present invention can also be applied to a three-phase AC heater.

DESCRIPTION OF SYMBOLS 1 Flyer heater 2 Metal pipe 21 Serpentine part 21a Straight line part 21b Arc part 21c Tip part 21d Base end part 21d1, 21d2 End part 21e, 21e1, 21e2 First turn part 21f Longitudinal center part 22, 23 Rising part 3 Heat generation Coil 3a Folded portion 3b Center portion in length direction 4 Insulating material 5 Oil temperature sensor 6 Thermal sensor for high limiter 8 Element wire of thermal sensor for high limiter 9 Lead wire of heating coil

Claims (3)

A meandering portion formed by folding back in a meandering manner, the leading end portion being closed, a rising portion raised from the proximal end portion of the meandering portion, and a lead wire folded back within the leading end portion of the meandering portion and from the rising portion In a heater for a fryer equipped with a heating coil derived from
While setting the coil pitch interval of the heating coil in the tip portion of the meandering portion larger than the coil pitch interval of other locations,
A fryer heater, characterized in that a high-limiter thermal sensor for detecting the temperature of the heating coil is disposed inside a meandering portion between the base end portion and the first folded portion. A meandering part formed by folding back in a meandering manner, a rising part rising from both ends of the meandering part, and an inside of the meandering part, and lead wires from both rising parts, respectively. In a fryer heater equipped with a heating coil
While setting the coil pitch interval of the heating coil at the central portion in the length direction of the meandering portion larger than the coil pitch interval at other locations,
A fryer heater, characterized in that a high-limiter thermal sensor for detecting the temperature of the heating coil is disposed in a meandering portion between any one of the end portions and the first folded portion.   The fryer heater according to claim 1 or 2, wherein an oil temperature sensor for detecting the temperature of oil in the oil tank is incorporated in the rising portion.

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