JP2012074312A - Lip heater for fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly economical lip heater for a fryer which can retard oxidation of cooking oil significantly by keeping the temperature of the cooking oil at a fixed level, and is less susceptible to damage.SOLUTION: A nichrome wire 20A that is a heating element is entered into a tubular protective tube 22 composed of an insulating material, and the protective tube 22 with the nichrome wire 20 is arranged in the space 12 of a main body 16. Terminals 28a and 28b are arranged neither on the inside nor the outside of the position of the nichrome wire 20 on the section including two nichrome wires 20 in the main body 16.

Description

  The present invention relates to a fryer lip heater for heating frying cooking oil.

  Conventionally, fried food utensils called fryer are used in restaurants and supermarkets. The fryer is one in which a cartridge heater is placed inside an oil tank that contains cooking oil, and the cooking oil is heated by the heating means of the cartridge heater (Patent Document 1).

  Next, the cartridge heater will be described with reference to FIGS. The cartridge heater 40 includes a cylindrical covering member 44 that is an outer skin having a space 42 inside. The covering member 44 is formed by integrally forming a main portion 46 that is put under the oil level of the cooking oil of the fryer and a rising portion 48 that extends above the oil level of the cooking oil. The tip of the main body 46 is closed, and the other end of the main body 46 communicates with one end of the rising portion 48. The other end of the rising portion 48 is also closed, but terminals 54 and 60 described later are set to protrude from the other end of the rising portion 48.

  Inside the main body 46 space 42, an insulating and rigid cylindrical ceramic core 50 is provided, and a hole 52 is formed in the axial direction of the ceramic core 50. A rod-shaped terminal 54 is inserted into the hole 52. The end portion 56 a of the rod-shaped terminal 54 is disposed near the tip which is the closed end of the main body portion 46, and the other end side of the rod-shaped terminal 54 inserted into the hole 52 of the ceramic core 50 protrudes from the rod-shaped terminal 54. Then, it passes through the rising portion 48 and is set to project outward from the other closed end of the rising portion 48.

  A coiled nichrome wire (heating means) 58 is connected to the end portion 56 a of the rod-shaped terminal 54, and the coiled nichrome wire 58 extends outside the cylindrical ceramic core 50 in the axial direction of the ceramic core 50. It is arranged with almost the same length. One end of a rod-like terminal 60 is connected to the end portion 56 b of the coiled nichrome wire 58, and the terminal 60 passes through the rising portion 48 and is set to project outside from the closed end of the rising portion 48. That is, a rod-like terminal 54 and a rod-like terminal 60 are provided in the rising portion 48, and the other ends of the terminals 54 and 60 protrude outward from the rising portion 48, and these terminals 54 and 60 are connected to a power source (not shown). Connected.

  In the cylindrical covering member 44, the main body 46 has a ceramic core 50 (containing a terminal 54) and a nichrome wire 58, and the rising portion 48 has a terminal 54 and a terminal 60. Have. In the main body 46, an insulating powder 62 such as magnesia oxide is filled in the space outside the ceramic core 50 inside the main body 46 and in the space inside the rising portion 48.

  In the covering member 44, the cross-sectional outer shape (circular cross section shown in FIG. 7) of the main portion 46 put under the oil level of the frying cooking oil is changed from a circular one by a device (not shown) from the vertical direction to the horizontal direction. And deformed into a long oval or flat shape. This deformation increases the area of the outer surface of the covering member 44, increases the contact area between the cooking oil and the covering member 44, and increases the amount of heat transferred to the cooking oil.

  An upper portion of the rising portion 48 is provided with a fixing means 64 for fixing to a flyer housing or the like (not shown). By gathering the two terminals 54 and 60 at the position of the fixing means 64, the cartridge heater 40 can be easily attached to and detached from a fryer housing or the like (not shown).

JP 2002-125864 A

  In the cartridge heater 40, a ceramic core 50 and a rod-shaped terminal 54 are provided inside a coiled nichrome wire 58. For this reason, the heat from the coiled nichrome wire 58 is directed not only to the outside of the coiled nichrome wire 58 but also to the inside of the coiled nichrome wire 58. As a result, the rod-shaped terminal 54 provided inside the coiled nichrome wire 58 was often damaged by the heat of the coiled nichrome wire 58. For this reason, the conventional cartridge heater 40 had the fault that it had to be replaced every several years.

  When cooking oil exceeds about 250 ° C., oxidation is remarkably accelerated. Therefore, the temperature of cooking oil used in a commercial fryer is preferably about 250 ° C. or less. However, since the surface temperature of the cartridge heater 40 generates high heat far exceeding 250 ° C., the temperature applied to the cooking oil from the cartridge heater has to be adjusted occasionally, and it takes time to adjust the temperature of the cooking oil. There was a drawback. In the cartridge heater 40, the cooking oil is heated to a temperature far exceeding 250 ° C., and then the energization to the cartridge heater 40 is stopped when the cooking oil becomes higher than the desired temperature (the heating is stopped). ) To lower the temperature of the cooking oil, and then the cooking oil is heated again when the cooking oil falls below the desired temperature. The state of temperature change of this conventional cooking oil is shown by a one-dot chain line in FIG. In this way, the temperature of the cooking oil is adjusted by heating the cooking oil or stopping the heating, but the temperature of the cooking oil changes up and down to keep the temperature of the cooking oil constant. It took time and effort to hold. Further, since the cartridge heater 40 generates high heat far exceeding 250 ° C., there is a disadvantage that the speed of oxidation or deterioration of cooking oil increases. As a result, there was a problem that the cooking oil was replaced earlier and the economic efficiency was deteriorated.

  An object of the present invention is to provide an economical fryer lip heater that can greatly delay the oxidation time of cooking oil by keeping the temperature of the cooking oil substantially constant and is less damaged. Is.

  The fryer lip heater of the present invention has a cylindrical covering member composed of a main body portion located below the oil surface and a rising portion located above the oil surface, and a nichrome wire and its inside in the space of the covering member In the lip heater for storing two terminals connected to the nichrome wire and the insulating powder, two sets of protective tubes are accommodated in parallel in the space of the main body, and the two sets of protective tubes are connected to the continuous nichrome wire. The nichrome wire is reciprocated in the main portion by being inserted into the main portion, the terminals are connected to both ends of the nichrome wire, and the inside of the position of the nichrome wire in the cross section including the nichrome wire in the main portion Further, the terminal is not arranged on the outside. The present invention is characterized in that the two sets of protective tubes are arranged above and below the cylindrical main body. The present invention is characterized in that the longitudinal length of the cross-sectional outer shape of the cylindrical main part is longer than the lateral length.

  In the conventional cartridge heater, since the rod-shaped terminal is provided inside the coiled nichrome wire, there is a drawback that the heat of the coiled nichrome wire reaches the terminal inside the coiled wire and the life of the terminal is short. On the other hand, in the fryer lip heater of the present invention, a coiled nichrome wire is arranged in the reciprocating direction inside the space of the main part of the covering member, and a terminal is connected to the tip of the nichrome wire. is there. The nichrome wire is placed in the reciprocating direction inside the space of the main part, and the terminals are connected to both ends of the nichrome wire, so that the reciprocating nichrome wire is placed, and the rising part is connected to both ends of the nichrome wire Make sure to arrange the terminals to be used. This eliminates the need to place the rod-shaped terminals inside and outside the axial position of the nichrome wires, and prevents the heat from the nichrome wires from reaching the rod-shaped terminals, thereby damaging the terminals. It can be lost. As a result, there is no need to replace the cartridge heater due to breakage of the terminal every several years, which has occurred in the past, and the fryer lip heater can be used over a long period of time. Economical. According to the present invention, cooking oil is provided in comparison with a conventional cartridge heater by arranging two protection parts vertically inside the main part of the covering member and making the cross-sectional shape of the covering member elliptical or flat. The oil can be kept at a temperature that does not oxidize. In the present invention, two protective tubes are arranged vertically inside the main portion of the covering member, and the outer cross-sectional shape of the covering member is an elliptical shape or a flat shape. Thereby, the convection of the heated cooking oil can be efficiently performed, and there is an effect that the cooking oil in the oil tank can be made uniform quickly.

It is a perspective view which shows one Example of the lip heater for fryer concerning this invention. It is a principal part expansion perspective view of FIG. It is the sectional view on the AA line of FIG. It is a perspective view which shows the assembly state in the middle of the lip heater for fryer which concerns on this invention. It is a perspective view which shows the assembly state in the middle of the further progress of the lip heater for fryer which concerns on this invention. It is a perspective view of a conventionally known cartridge heater. It is the BB sectional view taken on the line of FIG. It is a graph of the temperature change at the time of heating with the conventional cartridge heater and the temperature change at the time of heating with the lip heater for fryer of this invention.

  Next, the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of a lip heater for a fryer according to the present invention, FIG. 2 is an enlarged perspective view of a main part of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a perspective view showing a part of the assembling of the fryer lip heater according to the present invention. The fryer lip heater 10 according to the present invention has a stainless steel covering member 14 having a space 12 formed therein. The covering member 14 is formed by integrally forming a main portion 16 that is put under the oil level of the cooking oil of the fryer and a rising portion 18 that extends above the oil level of the cooking oil. One end which is a free tip of the main body portion 16 is closed, and the other end of the main body portion 16 communicates with one end of the rising portion 18. The other end of the rising portion 18 is not closed, and terminals 28a and 28b, which will be described later, are set so as to protrude from the other end where the rising portion 18 is closed.

  In the present invention, as shown in FIGS. 2 and 3, two coiled nichrome wires (heating means) 20 are arranged in the longitudinal section of the space 12 of the main body 16. The two nichrome wires 20 are for the outward path through the space 12 of the main part 16, and the other one is for the return path through the space 12 of the main part 16. That is, a continuous nichrome wire 20 is reciprocated in the space 12 of the main body portion 16 of the covering member 14. A coiled nichrome wire 20 that is provided to reciprocate in the space 12 of the main body 16 is provided in an internal space 24 of a cylindrical protective tube 22a (both ends open) made of an insulating member on the forward path side. The return path is passed through the internal space 24 of a cylindrical protective tube 22b (both ends are open) made of an insulating member. In the present invention, the protective tube 22a and the protective tube 22b may be one long one, but a plurality of short ones may be used. One long protective tube is also referred to as “protective tubes 22a, 22b”, including one in which a plurality of short protective tubes are continuously arranged. The internal space 24 of the protective tubes 22a and 22b and the internal space 12 of the covering member 14 are filled with an insulating powder 26 such as magnesia oxide at a predetermined timing described later.

  As shown in FIG. 4, one coil-shaped nichrome wire 20 is connected and fixed to one end of a rigid rod-shaped terminal 28a at one end and one end of a rigid rod-shaped terminal 28b to the other end. Fix the connection. The terminal 28a and the terminal 28b protrude outward from the other end (in an open state) of the rising portion 18, and the other end of the terminal 28a and the terminal 28b rising portion 18 is connected to a power source (not shown).

  One nichrome wire 20 is passed through two sets of protective tubes (protective tube 22a and protective tube 22b) in series, and coiled nichrome wire 20 is arranged inside each of the two protective tubes 22a and 22b. To do. The protective tube 22a and the protective tube 22b are preferably cylindrical and have the same shape. As a method of providing the coiled nichrome wire 20 inside the protective tube 22a and the protective tube 22b, for example, the free tip of the terminal 28b (to which the nichrome wire 20 is connected) is first passed through the protective tube 22a, and then The protective tube 22b is passed in series in order, and then the free tip of the terminal 28b is taken out from the protective tube 22b. The center of the length of the nichrome wire 20 in a state where the two sets of the protective tube 22a and the protective tube 22b are passed is at a folded position where the nichrome wire 20 comes out from one protective tube 22a and is folded back to reach the other protective tube 22b. Applicable. At the folded position of the nichrome wire 20, it is desirable to make the nichrome wire 20 straight rather than coiled. In a state where the nichrome wire 20 is inserted into the protective tube 22a and the protective tube 22b, one end side of the terminal 28a is within a short distance in the protective tube 22a, and the other end side of the terminal 28a is the other end of the rising portion 18. Projecting outward from. Similarly, one end side of the terminal 28b is within a short distance in the protective tube 22b, and the other end side of the terminal 28b projects outward from the other end of the rising portion 18. The coiled nichrome wire 20 is preferably passed through the inside of the protective tube 22a and the inside of the protective tube 22b, but one nichrome wire 20 is inserted into each protective tube 22a, 22b. The nichrome wire 20 exiting the inside of the protective tube 22a and the nichrome wire 20 exiting the inside of the protective tube 22b may be connected and fixed at the tip of the nichrome wire 20 (a continuous nichrome wire). . However, when the two nichrome wires 20 are connected and fixed, the resistance increases at the connecting portion, so it is desirable to use one nichrome wire 20 from the beginning.

  One nichrome wire 20 is inserted through two sets of protective tubes (protective tube 22a and protective tube 22b), and is folded at the approximate center of the length of the nichrome wire 20 (in the state shown in FIG. 4). Is inserted into the space 12 from the other end (in an open state) of the rising portion 18 of the covering member 14 with the folded portion as the head (FIG. 5).

  Before inserting the thing of the state of FIG. 4 in the inside of the space 12 of the cylindrical covering member 14, the cylindrical covering member 14 is processed in advance. The processing is performed by compressing a portion that becomes the main portion 16 from the left and right directions with a dedicated device (not shown) in a single cylindrical covering member 14 so that the vertical direction of the outer shape is relative to the horizontal direction. To a long oval or flat shape. At the same time, the free tip of the portion that becomes the main body 16 is closed. Note that one end of the covering member 14 on the rising portion 18 side is kept open.

  As shown in FIG. 5, the one in the state shown in FIG. 4 with the folded portion as the head is inserted into the portion that becomes the main portion 16 processed into an elliptical shape or a flat shape from the opening on the rising portion 18 side. At this time, the two sets of protective tubes (the protective tube 22a and the protective tube 22b) are not in contact with each other and are spaced apart in parallel. At the same time, in a state where the main portion 16 is placed in the flyer, the protective tube 22a and the protective tube 22b are set to be arranged in the vertical direction, and the average position of the vertical and horizontal intervals is secured. To do. Thereafter, the inner space 24 of the protective tube 22a and the protective tube 22b and the inner space 12 of the covering member 14 (excluding the inner space 24 of the protective tube 22a and the inner space 24 of the protective tube 22b) are filled with insulating powder 26 such as magnesia oxide. To do. After the insulating powder 26 is filled, the opening of the internal space 12 on the rising portion 18 side is sealed with a plug member 30 (FIG. 2) such as a wax, a glass seal or a silicon seal so that the filled insulating powder 26 does not leak. To do. Outside the opening of the rising portion 18, a fixing means 32 for fixing to a flyer housing or the like (not shown) is provided. The terminals 28a and 28b protrude sufficiently from the opening of the rising portion 18 so that they can be connected to a power source (not shown). The terminals 28a and 28b are gathered at the position of the fixing means 32, and the fryer lip heater 10 can be easily attached to and detached from the fryer housing or the like.

  The covering member 14 in which the inside of the covering member 14 is filled with the insulating powder 26 and the opening is sealed with a wax, a glass seal, a silicon seal or the like is linear. The linear covering member 14 is bent 90 degrees with respect to the rising portion 18 and the rising portion 18 by a dedicated device (not shown) to form a main portion 16 having a shape that is folded back once more into a U-shape. In FIG. 1, the main body portion 16 of the covering member 14 has a shape that is folded three times.

  FIG. 3 is a cross-sectional view of the fryer lip heater 10 according to the present invention manufactured based on FIGS. 4 and 5. In the fryer lip heater 10 according to the present invention, the protective tubes 22a and 22b in which the coiled nichrome wire 20 is housed are vertically arranged in the covering member 14 (main part 16) formed in an elliptical shape or a flat shape. It is provided in parallel. Here, “upper and lower” means that the fryer lip heater 10 according to the present invention is disposed above and below with the fryer lip heater 10 installed in the fryer. In the present invention, in the cross section including the two nichrome wires 20 in the main body portion 16 at a position lower than the oil level of the cooking oil of the fryer, the coiled nichrome wires 20 are separated from each other in two upper and lower portions, respectively. It is provided inside the protective tubes 22a and 22b.

  Since the cooking oil heated up along the outer wall of the covering member 14 by making the cross-sectional outer shape of the main body portion 16 disposed below the oil surface of the covering member 14 into an elliptical shape or a flat shape, cooking is performed. The time for the oil to contact the covering member 14 becomes longer, and the heating efficiency to the cooking oil can be improved. Since the heating efficiency to cooking oil is good, the temperature of the nichrome (heating means) wire 20 inside the covering member 14 can be lowered, and energy loss can be minimized. The reason why the folding is provided is to ensure a long length of the main body portion 16 of the covering member 14 in a limited area of the fryer. Furthermore, by making the main body portion 16 of the covering member 14 into a folded shape, there is an effect that the cooking oil in the oil tank can be quickly heated to a uniform temperature. Note that the compression of the main body portion 16 of the covering member 14 into an elliptical shape or a flat shape and the folding back into the U-shape one or more times are performed by a conventionally known dedicated device. A description of the method is omitted here.

  In the present invention, in the cross section of the main portion 16, the two nichrome wires 20 on the forward side and the return side are provided. On the other hand, the terminal 28 a and the terminal 28 b connected to the nichrome wire 20 are provided inside the rising portion 18. Is to be placed. That is, in the cross section including the two nichrome wires 20 in the main portion 16, neither the rod-shaped terminal 28 a nor the terminal 28 b is provided on the outside or the inside of the nichrome wire 20. As a result, the terminals 28a and 28b are not heated by the nichrome wire 20, and the lifetime of the terminals 28a and 28b can be kept long. Therefore, there is no need to replace the cartridge heater due to the damage of the terminal every several years that has occurred in the past, and it is possible to use the fryer lip heater without a long-term failure, and customers who use the fryer lip heater It will be very economical.

  In the present invention, the coiled nichrome wire 20 which is a heating means for heating the cooking oil is provided inside the protective tubes 22a and 22b, and the covering member 14 is formed into an oval or flat shape, thereby forming the covering member 14. The protective tubes 22a and 22b are separately arranged in the upper and lower sides. The conventional cartridge heater has a rod-like terminal inside the coiled nichrome wire, and has a drawback of applying heat generated from the nichrome wire to the inner terminal. In the present invention, the coiled nichrome wire Since heat generated from 20 can be quickly exchanged to the outside without accumulating heat inside, the surface temperature of the main part 16 can be kept low, and can be kept at a temperature that suppresses oxidation of cooking oil. it can.

DESCRIPTION OF SYMBOLS 10 Lip heater 12 Space 14 Cover member 16 Main part 18 Rising part 20 Nichrome wire 22a Protective tube 22b Protective tube 24 Space 26 Insulating powder 28a Terminal 28b Terminal

Claims (3)

  Nichrome wire and two terminals connected to the nichrome wire inside the space of the covering member having a cylindrical covering member composed of a main body portion located below the oil surface and a rising portion located above the oil surface In the lip heater for storing the insulating powder, two sets of protective tubes are accommodated in parallel in the space of the main body portion, and the nichrome wires are inserted by passing the continuous nichrome wires through the two sets of protective tubes. Arranged in a state of reciprocating in the main part, the terminals are respectively connected to both ends of the nichrome wire, and the terminals are arranged inside and outside the position of the nichrome wire in the cross section including the nichrome wire in the main part. A fryer lip heater characterized by not.   The fryer lip heater according to claim 1, wherein the two sets of protective tubes are arranged above and below the cylindrical main body.   3. The fryer lip heater according to claim 1, wherein a longitudinal length of a cross-sectional outer shape of the cylindrical main body is longer than a lateral length.

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