FR2731607A3 - TANK FOR COOKING APPLIANCE - Google Patents

Abstract

Tank (100) connected to a heating element (113) for heating the cooking medium and having an inner face (101) defining the bottom (104) of the tank and the cooking volume, said inner face (101) comprising two parts (102, 103), the first part (102) being made of a first material having better thermal conduction than the second part (103) which is located above the bottom (104) of the tank.

Description

TANK FOR COOKING APPLIANCE

  The present invention relates to a tank

for cooking appliance.

  Until now, fryer tanks have an internal face made of a single material. When cooking food in oil or fat, a solid layer forms and

  adherent or varnished on the walls of the tank just

  above or at the oil level. Below the oil level, only a thin layer of varnish is

shape, poorly adherent layer.

  The layer of varnish formed above the oil level is formed by the condensation of oil vapors and their polymerization, and is difficult to

to take off.

  To try to solve this problem, we have proposed fryers provided with removable tanks to facilitate their cleaning. Preferably, the removable tank is made of stainless steel because this material is particularly suitable for cleaning. One drawback of such tanks is that stainless steel is not the best material when it comes to

heat conduction.

  The present invention relates to a tank which is perfectly suited both for cleaning and for

  transmission of heat to oil or cooking liquid.

  The tank for cooking appliance according to the invention is intended to contain a cooking medium such as oil, fat, for cooking or frying food, said tank being intended to be connected to a heating element for heating. the cooking medium and cook or fry the food. Said tank has an inner face defining the bottom of the

  tank and the internal or cooking volume of the tank.

  According to the invention, said inner face has two parts, a first part being made of a first material having heat conduction or transfer properties, while the second part which is located at least partially at a higher level of the inner face of the bottom of the tank and of the first part is made of a second material having less conduction or heat transfer properties than those of the first material. Said second material is preferably a material having cleaning facilities. According to an advantageous embodiment, the bottom of the tank is at least partially made with said first material, while the side walls

  of the tank are made with said second material.

  Said first material is for example aluminum, while said second material is for

  example of stainless steel or enamelled steel.

  According to a detail of an embodiment, the bottom comprises a first part made with said first material, the second part of the bottom located between said first part and the side walls of

  the tank being made with said second material.

  Preferably, said second part of the bottom has a groove the bottom of which is located at a level below the internal face of the bottom of the tank made with said first material. Such a groove makes it possible to collect particles or crickets and to form a

area with little turbulence.

  According to a particular embodiment, the first part of the bottom is a plate whose edges

  are supported on the second part of the bottom.

  Preferably, the plate is provided near its edges with a means for limiting the conduction of heat from the center of the plate to

edges.

  For example, the tank comprises a first container made of said second material and the bottom of which is partially covered by the plate, so as to define a housing between the bottom of the container and the plate. Said housing contains the heating element, and optionally a temperature sensor and / or a thermostat and / or a control and / or security system, said housing having an opening for the passage of an electrical energy supply to the heating element, a seal extending in said opening to seal the housing. This supply is for example a stud or socket intended to be

  connected to a socket or connector.

  Advantageously, the plate has on its face whose edges are intended to bear on the second part of the bottom, a first protuberance and a second protuberance distant from each other so as to define between them a groove, the first protrusion being, relative to the second, more adjacent to the side walls of the tank. The second protuberance has a height adapted so that the free end of this protuberance is distant from the second part of the bottom. A seal or adhesive seal or bead extends in said groove, one face of said seal or bead touching the second part of the bottom to ensure the seal between the plate and the second

part of the bottom.

  Thus, an air passage from the housing to the seal or bead is possible. This passage allows ventilation of the throat and allows, for example, the

glue to harden.

  Advantageously, the seal has at least one passage, an internal channel or a cavity to increase the crushing of the adjacent parts of the seal.

at said passage, channel or cavity.

  The invention also relates to a cooking appliance, in particular a fryer comprising a tank

according to the invention.

  Features and details of the invention

  will emerge from the following detailed description in

  which reference is made to the accompanying drawings.

  In these drawings, - Figure 1 is a sectional view of an embodiment of a tank according to the invention; - Figure 2 is a partial perspective view in section of the tank according to Figure 1; - Figure 3 is a rear perspective view of the plate covering the bottom of the tank of Figure 1; - Figure 4 is a sectional view of another form of tank according to the invention, and - Figure 5 is a view of a detail of the tank

Figure 4.

  Figure 1 shows an embodiment of a fryer comprising a tank 1 according to the invention. This tank 1 has two parts, namely a lower part 2 in the form of a plate and an upper part 3 in the form of a bowl. The bowl 3 which is for example made of stainless steel has at its ends an annular head 4 intended to bear on the walls 5 of

the fryer.

  The heating element 10 is arranged at the lower part of the bowl, for example on the plate 2

made of aluminum.

  Since the bowl 3 is made of stainless steel and stainless steel is located at levels located above the upper level of the oil O, the tank 1 can be perfectly cleaned. Preferably, the bowl can be removed from the fryer, but, even in the case of such a fixed bowl or integral with the rest of the fryer, it is possible

  perform an excellent cleaning of the tank.

  It is important to note that stainless steel (such as chrome nickel steel) has a heat conduction coefficient (15 W / mK), much lower than that of aluminum (210 W / mK), so that the heat conduction towards the head or edge

higher 4 is reduced.

  In the embodiment, the stainless steel bowl obtained by stamping has a bottom 23 on which a heating plate (casting) 2 can be fixed with the interposition of a seal 24 by means, for example, of a central screw 25 (broken lines). The stainless steel bottom 23 has one or more openings such as a sealed opening 28 for the passage of a temperature sensor or a thermostat and a sealed opening 26 for the passage of a connection 27 (for bringing electrical energy to

the heating plate 24).

  Bowl 3 is a common stainless steel bowl with a suitable, perforated bottom, made of polished austenitic chrome-nickel steel. With a common thickness of 0.7 mm, such a bowl weighs

about 0.9 kg.

  The aluminum bottom plate has the heating element 10 and is die-cast in

  a corrosion resistant alloy.

  This aluminum plate can optionally

  be provided with a PTFE coating (polytetrafluoro-

  ethylene) or other heat resistant coating; however a simply polished form is suitable

  already particularly at cleaning.

  With an average thickness of around 6 mm, this plate weighs less than 450 grams, so that the bowl-aluminum bottom plate assembly is not

  heavier than current injected tanks.

  The aluminum bottom plate 2 preferably has a steel heating element (resistor) cast thereon. Given its high admissible power density, a small resistance can be used and an important place remains free for the

  temperature sensor or thermostat.

  The outlets or outlets are made watertight and are folded down to pass through an opening in the bottom made of stainless steel and to be connected to a connector. As shown in the sketch of the embodiment, the bottom of the stainless steel bowl will protect the studs so that

avoid any deterioration.

  The expansion coefficients of stainless steel and aluminum do not differ so much, but because of a possible large temperature difference between the bottom plate and the bottom of the bowl during the heating phase, a difference of

  expansion of 1.2 mm can be expected.

  The removable assembly of the plate by means of a screw allows disassembly and reassembly operations without sealing problem, for example by means of a suitable annular seal placed between the edges

  of the plate and the support face of the bowl.

  Non-removable fixing of the bowl with the plate is also possible by connecting the aluminum base to the stainless steel bowl using a heat-resistant silicone adhesive. Another important difference between an aluminum bowl and a stainless steel bowl is the temperature expected for the side walls, so that thanks to the very low heat conductivity of the stainless steel side walls, a

  cold wall fryer can be obtained.

  Figure 2 shows a decrease in local thickness 31 of the aluminum plate, at the temperature sensor or thermostat, so that the

  temperature of the oil and that of the bottom is measured.

  The heating element 10 is located in a chamber 32 which is defined between the bottom 23 of the bowl 3 and the plate 2. The heating element 10 does not touch the bottom 23 of the bowl 3, so that a layer of air forms insulation between the heating element 10 and the bottom 23. This insulation is obtained by means of an air layer or an air film, which preferably has a thickness of less than 5 mm (from

preferably 1 to 2 mm).

  The minimum distance between the heating element and the bottom 23 is therefore preferably less than 5 mm,

in particular less than 2 mm.

  Figure 4 shows another form of

  realization of a tank according to the invention.

  This fryer tank 100 has an inner face 101 defining the bottom of the tank and the internal or cooking volume of the tank. This inner face 101 has two parts 102, 103, a first part being made of a first material (aluminum) having heat conduction or transfer properties, while the second part 103 which is located at least partially at a higher level. the inner face of the bottom of the tank and the first part is made of a second material (stainless steel) having heat conduction or transfer properties

  less than those of the first material.

  The bottom 104 of the tank has a first part 102 made with said first material and a second part 103A. The second part 103A of the bottom is located between said first part 102 and the side walls 103B of the tank, this second part

  being made with said second material.

  Said second part 103A of the bottom has a groove 105 whose bottom is located at a level N lower than the level of the internal face 106 of the bottom of the

  tank made with said first material.

  The first part 102 of the bottom consists of a plate, the edges 107 of which bear on the

second part 103A from the bottom.

  The plate is provided near its edges with a means to limit the conduction of heat from

  the center of the plate toward the edges.

  Such means are, for example, one or more thickness decreases (108, 109) of the plate 102, by

example in the vicinity of the edges 107.

  In fact, the tank comprises a first container made of said second material and whose bottom 111 is partially covered by the plate 102, so as to define a housing 112 between the bottom 111 of the container 1 and the plate 102. Said housing 112 contains the heating element 113, a temperature sensor, a thermostat, a control system and / or fuse. Said housing 112 has an opening 114 for the passage of a connector 115 for supplying electrical energy to the heating element, a seal 116 extending in said opening to ensure

the sealing of the housing 112.

  The plate 102 has on its face whose edges 107 are intended to bear on the second part of the bottom 103A, a first protuberance 117 and a second protuberance 118 distant from each other so as to define between them a groove 119 , the first protuberance 117 being, relative to the second, more adjacent to the side walls 103B of the tank. The second protuberance 118 has a height adapted so that the free end 120 of this protuberance is distant from the second part 103A of the bottom. A seal or seal of glue or bead 121 extends in said groove 119, one face of said seal or bead touching the second part 103A of the bottom to ensure sealing between the plate 102 and the second

bottom part 103A.

  The seal used is shown in Figure 5.

  It has two beads 122 comprising a cavity 123 to allow crushing in the X direction of the

  parts of the joint adjacent to said channel or cavity.

  The seal also has on the face opposite to that carrying the beads of the lips of

contact 124.

  The air or gas present in the cavities serves as a cushion or elastic means and as a thermal barrier.

Claims (11)

  1. Bowl (1,100) for a cooking appliance intended to contain a cooking medium for cooking or frying food, said bowl being intended to be connected to a heating element (10,113) for heating the cooking medium and cooking or frying them. food, said tank having an inner face (101) defining the bottom (104) of the tank and the internal or cooking volume of the tank, characterized in that said inner face (101) has two parts (102,103), a first part (102) being made of a first material having properties of conduction or transfer of heat, while the second part (103) which is located at least partially at a higher level of the inner face of the bottom of the tank and of the first part is made of a second material having conduction or transfer properties   less heat than the first material.   2. Tank according to claim 1, characterized in that the bottom (104) of the tank is at least partially made with said first material and in that the side walls (103B) of the tank are   made with said second material.   3. Tank according to claim 1 or 2, characterized in that said first material is aluminum, while said second material is   stainless steel or enameled steel.   4. Tank according to one of claims 1 to 3,   characterized in that the bottom (104) comprises a first part (102) made with said first material, the second part (103A) of the bottom located between said first part (102) and the side walls (103B) of the tank being made with said second material. 5. Tank according to claim 4, characterized in that said second part (103A) of the bottom has a groove (105) whose bottom is located at a level (N) below the internal face of the part (102) of the bottom   of the tank made with said first material.   6. Tank according to claim 4 or 5, charac-   terized in that the first part (102) of the bottom is a plate whose edges (107) bear on the second part (103A) at the bottom.   7. Tank according to claim 6, characterized in that the plate (102) is provided in the vicinity of its edges (107) with a means for limiting the conduction of   heat from the center of the plate to the edges.   8. Tank according to one of claims 6 and 7,   characterized in that the tank has a first container   pient made in said second material and the bottom (111) is partially covered by the plate (102) so as to define a housing (112) between the bottom (111) of the container and the plate (102), and in that said housing (112) contains the heating element (115), and optionally a temperature sensor and / or a thermostat and / or a control and / or security system, said housing (112) having an opening (114) for the passage of an electrical energy supply (115) to the heating element (115), a seal (116) extending in said opening to ensure the tightness of the housing.   9. Tank according to one of claims 6 to 8,   characterized in that the plate (102) has on its face whose edges (107) are intended to bear on the second part (103A) of the bottom, a first protuberance (117) and a second protuberance (118) distant from it one of the other so as to define between them a groove (119), the first protuberance (117) being relative to the second (118) adjacent to the side walls (103B) of the tank, in that the second protuberance ( 118) has a height (h) adapted so that the free end (120) of this protuberance (118) is distant from the second part (103B) of the bottom, and in that a joint or joint of glue or bead (121) extends in said groove (119), one face of said seal or bead touching the second part (103A) of the bottom to ensure sealing between the   plate (102) and the second part (103A) of the bottom.   10. Tank according to claim 9, characterized in that the seal has at least one passage, an internal channel or a cavity to increase the crushing of the parts of the seal adjacent to said passage, channel or cavity. 11. Fryer comprising a tank according to one   any of claims 1 to 10.