JP3184673B2 - Heating vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved heating vessel for uniformly heating a large amount of oil on a food processing machine or the like.

[0002]

2. Description of the Related Art Conventionally, means for heating a large amount of oil in an oil tank in a food processing machine or the like is disclosed, for example, in JP-A-4-122.
As described in Japanese Patent Application Laid-Open No. 223-223, a method of heating by burning a gas, or a method of throwing a sheathed heater directly into an oil tank and heating as described in Japanese Patent Application Laid-Open No. 3-264014 has been used.

[0003]

However, heating by burning the gas requires a large-scale exhaust equipment for exhausting the exhaust gas to the outside of the room. Further, since a large amount of air is consumed to burn the gas, it is necessary to introduce the air from the outside. Therefore, there is a problem that the equipment becomes large. Further, in the case of the combustion heating method using gas, a large amount of heat is released together with the exhaust gas when the exhaust gas is released to the outside.

[0004] Further, a system in which a sheathed heater is directly thrown into an oil tank has higher thermal efficiency than a gas combustion system, but the oil is in direct contact with the high-temperature surface of the heater, so that the oil is oxidized quickly. There are disadvantages. Therefore, it is necessary to frequently change the oil, which is a problem on the global environment such as treatment of waste oil, and also raises costs.

[0005] Therefore, by using electricity for heating, the supply and exhaust equipment is not required, the equipment is simplified, and the heater is mounted outside the container so that the oil is not in direct contact with the heater. The purpose is to slow down the oxidation of oil.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a planar heater for uniformly heating the entire surface of a bottom portion of a container having a large bottom area with an open upper portion is provided. In the attached heating container, the pressing plate for pressing the sheet heater against the bottom of the container is divided into a fraction (for example, 1/3 to 1/5) of the area of the sheet heater, and is appropriately spaced. Arrange to cover the entire area of the planar heater,
Fastening portions to the container bottom are provided at one central portion and multiple outer peripheral portions of each holding plate, and the pressing force of the heater is applied to these multiple peripheral portions or one central portion and multiple outer peripheral portion fastening portions. In order to maintain uniformity, a reaction force generating member such as a spring is interposed, the heater is always pressed against the bottom of the container to easily transfer heat from the heater to the container, and when the holding plate is expanded by thermal expansion, It is intended to prevent the holding plate and the container from being deformed due to distortion by overcoming the holding force of the spring and extending the holding plate freely.

[0007] Furthermore, both ends of the long side of the holding plate are bent, a heat insulating material is interposed between the heater and the holding plate with the bent portion facing downward, and a fastening portion at one central portion and a plurality of outer peripheral portions is formed. In order to keep the pressing force of the heater uniform, a reaction force generating member such as a spring is interposed at a plurality of fastening portions at the outer peripheral portion.

[0008]

With the above construction, each of the divided pressing plates has a small temperature variation and a small deformation due to thermal expansion, and the fastening portion with the reaction force generating member interposed therebetween is a sheet heater formed by the pressing plate. The heat transfer is improved by uniformly pressing the entire surface of the container against the bottom of the container, and when the holding plate expands due to thermal expansion, it expands freely without fixing, reducing deformation due to distortion and reducing heat transfer. Without heating the liquid in the container efficiently.

The holding plate having both long sides bent at both ends is durable even when formed of a thin plate, and the heat insulating material prevents heat deformation in combination with reducing heat transfer from the planar heater to the holding plate. I do.

[0010] Therefore, a supply / exhaust duct as in the case of combustion heating by gas is not required, and oil does not directly contact the high-temperature heater, so that the progress of oxidation is slowed.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of a main part thereof, FIG. 3 is a plan view thereof, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. 5 is a plan view thereof.

In FIG. 1, reference numeral 1 denotes a metal container having a bottom and is open at the top, and reference numeral 2 denotes a bottom surface of the container 1 which has a large area and is flat. Reference numeral 3 denotes a planar heater mounted on the entire surface of the bottom surface 2 of the container 1 by pressure bonding, and an upper insulating material 4 and a lower insulating material 5 are mounted on the upper and lower surfaces of the planar heater 3. (See FIG. 2) Reference numeral 6 denotes a plurality of pressing plates mounted below the sheet heater 3, and the pressing plate 6 has one through hole at one place at the center and four corners at the outer periphery. . Bolts 7 and 8 are welded to the bottom surface 2 of the bottomed container 1 at positions corresponding to the through holes of the respective holding plates 6. These bolts 7 and 8
Is smaller than the diameter of the through hole of the holding plate 6, and has a gap 9 around it.

The holding plate 6 is fitted with holes at the center and four corners fitted to the bolts 7 and 8. Holding plate 6
The nut 10 is attached to the bolt 7 corresponding to the hole at the center of the bracket, and the holding plate 6 is fixed (fixed). Also,
The fixing method of the four corners of the outer periphery of the holding plate is different from that of the center part, and a reaction force generating member (for example, a spring) is provided between the nut 11 attached to the bolt 8 corresponding to the four corner holes of the holding plate 6 and the holding plate 6. (Hereinafter referred to as a spring). That is, the bolts 7 and 8 and the nut 1
Each holding plate 6 is fixed to the bottom surface of the container 1 at the center by a fastening portion composed of 0 and 11, but has four outer peripheral slidable structures. Reference numeral 13 denotes a power supply supplied to the planar heater 3, and reference numeral 14 denotes a temperature sensor for detecting the temperature of the liquid in the container 1.

4 and 5 are basically similar to those shown in FIGS.
The following two points are the same as those described above. The first point is that the insulating material 1 is located between the lower surface insulating material 5 below the heater 3 and the holding plate 16.
5 must be attached. The second point is that the thickness of the holding plate 16 is reduced and the end face on the long side is bent to increase the strength.

Next, the operation of this embodiment having the above configuration will be described.

When an appropriate amount of liquid (for example, edible oil) is charged into the container 1 and then the planar heater 3 is energized from the power supply 13,
The temperature of the planar heater 3 increases, the temperature of the bottom surface 2 of the container 1 to which the heater 3 is attached also increases, and the temperature of the liquid in the container 1 increases. When the energization of the planar heater 3 is continued and the temperature of the liquid reaches a predetermined temperature, this is detected by the temperature sensor 14.
Is detected and the signal is sent to a control circuit (not shown), where the power supply to the planar heater 3 is stopped. With the above operation, the liquid temperature in the container 1 is maintained at a predetermined temperature.

When the temperature of the planar heater 3 rises, the temperature of the pressing plate 6 pressing the planar heater 3 against the bottom surface 2 also rises. However, the holding plate 6 is one of the entire area of the planar heater 3.
Since the pressure is divided into ３ to ５, the temperature varies between the pressing plates 6, but when viewed with a single pressing plate 6, both ends in the longitudinal direction are far from the heat-generating portion, so that the temperature is low. Therefore, the temperature in the central part near the heat generating part tends to be high.

Therefore, the holding plate 6 is fixed at the center, and extends in the longitudinal direction since the outer periphery has a slidable structure at four corners. When the planar heater 3 is energized and the temperature of this portion rises, the heat is transmitted to the bottom surface 2 of the container 1 and the holding plate 6. If the holding plate 6 is completely fixed, the high temperature portion expands due to thermal expansion, and this portion bends,
The planar heater 3 riding on the holding plate 6 is separated from the bottom surface 2 of the container 1, the heat transfer efficiency from the planar heater 3 is reduced, and only the holding plate 6 is further heated, resulting in a vicious cycle.

According to the structure of the present invention, the center of the holding plate 6 is fixed as described above, but the four corners of the outer periphery are slidable because the holding plate 6 is pushed up by an appropriate force using the spring 12. If the temperature rises, it does not bend in the longitudinal direction.

The holding plate 6 presses the sheet heater 3 against the bottom surface 2 of the container 1 with the same force even when the sheet is set and the temperature rises and the sheet is extended, so the efficiency of heat transfer from the sheet heater 3 to the container 1 is increased. Means that stable heating efficiency can be obtained without change.

In another embodiment shown in FIG.
A heat insulating material 15 is attached to the lower side, that is, between the planar heater 3 and the holding plate 16 to prevent the heating of the holding plate 16.

[0022]

As described above, by adopting the structure of the present invention, in a heating vessel in which a heater is mounted on the entire surface of a vessel having a large floor area and uniform heating is performed on the entire surface, the presser plate of the heater is replaced with the entire area of the planar heater. The 1/3 to 1/5 strips are continuously arranged at small intervals, so that the temperature variation in each holding plate is reduced, the direction of elongation due to thermal expansion is made uniform, and abnormal deformation is prevented. It has the effect of preventing.

The central part of the holding plate is fixedly fixed, and the four corners in the longitudinal direction of the holding plate are slidable via springs so that the pressing force of the heater is kept uniform, so that the heater is always pressed against the bottom of the container. In this case, the heat from the heater is easily transferred to the container, and when the holding plate expands due to thermal expansion, the holding plate can freely expand by overcoming the pressing force of the spring, and the holding plate and the container are deformed by distortion. And a stable heat transfer effect can be obtained.

Since the heating is performed by electricity, a large-scale exhaust facility such as heating by burning gas is not required. Further, higher thermal efficiency can be obtained as compared with the combustion heating method using gas. Further, compared with the method in which the sheathed heater is directly thrown into the oil tank, the oil is not uniformly exposed to a high temperature and is uniformly heated, so that there is an advantage that the oxidation of the oil does not proceed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a heating vessel showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is a plan view of the same.

FIG. 4 is a sectional view of a heating vessel showing another embodiment of the present invention.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Bottom surface 3 Planar heater 6, 16 Holding plate 7, 8 Bolt (fastening part) 10, 11 Nut (fastening part) 12 Spring (reaction generating member)

Claims (4)

(57) [Claims] A container having a large bottom area with an open top.
In a heating vessel equipped with a planar heater (3) for uniformly heating the entire bottom surface (2) of the container (1), a presser for pressing the planar heater (3) against the bottom surface (2) of the container (1). The plates (6) and (16) are divided into a fraction of the area of the planar heater (3) and arranged at appropriate intervals to cover the entire area of the planar heater (3). At the center of the holding plates (6) and (16) and at multiple locations on the outer periphery,
Fastening parts (7), (8) with the bottom surface (2) of the container (1),
(10) and (11) are provided, and these fastening parts (7), (8), (1)
(0) and (11) a heating vessel characterized in that a reaction force generating member (12) such as a spring is interposed in order to keep the pressing force of the planar heater (3) uniform. 2. A central part 1 of said holding plates (6), (16).
Fastening portions (7), (8), (10), and (11) for connecting to the bottom surface (2) of the container (1) are provided at a plurality of locations and at a plurality of outer peripheral portions. 2. The heating container according to claim 1, wherein the heating container has a structure in which a reaction force generating member such as a spring is interposed in order to keep the pressing force of the planar heater uniform. 3. The heating vessel according to claim 1, wherein a heat insulating material (15) is interposed between the pressing plates (6) and (16) and the planar heater (3). 4. A heat insulating material (15) between the sheet heater (3) and the pressing plate (16), bending both end surfaces on the long side of the pressing plate (16) and mounting the bent portion downward. The heating container according to claim 1, 2 or 3, wherein the heating container has a structure interposed therebetween.