DE102021114666A1 - Cooking device for commercial kitchens with liposuction device, liposuction device and method for operating such a cooking device with liposuction - Google Patents

Abstract

The present invention relates to a cooking appliance for commercial kitchens in the form of a combination steamer (1, 1') with a cooking chamber (3) for cooking food, which can be arranged on a plurality of cooking levels (32), or a rotisserie appliance with a cooking chamber for cooking food that can be arranged on a rotatable food support, with a heating device for heating the atmosphere in the cooking space, a device control for controlling the cooking device, a cooking space drain (33) which is located below a floor (4) of the cooking space (3) and for A fat-water mixture and gaseous components of the cooking chamber atmosphere are discharged from the cooking chamber (3), with the cooking chamber drain (33) extending from a drain opening (15) in the floor (4) or in the floor area of the cooking chamber (3) to a siphon device (35 ) extends, wherein a fat collecting device (59) is provided, the at least one fat collecting container (61), at least one liposuction line (73), at least one suction pump (77) and little comprises at least one fat discharge line (82), the fat suction line (73) extending from the fat collection container (61) to the suction pump (77), the suction pump (77) being set up to discharge the fat-water mixture sucked in via the fat suction line (73). into the fat discharge line (82), and wherein the fat collecting device (59) comprises a cleaning device which is set up to discharge water at least via the fat suction line (73) and the fat collecting container (61) into the cooking chamber drain (33) in the direction of the siphon device (35) to promote.

Description

The present invention relates to a cooking device for commercial kitchens in the form of a combination steamer or a rotisserie device with a liposuction device.

Cooking appliances for commercial kitchens can have large or very large cooking chambers that are suitable for accommodating a large amount of food to be cooked. When cooking fatty food, such as poulards, ducks, geese, chickens, etc., a relatively large amount of fat is released from the food. This fat, which escapes together with the liquid in the food to be cooked, in particular water, forms the so-called vapors when it is discharged from the cooking chamber together with the gaseous atmosphere in the cooking chamber that has been discharged. This vapor is discharged from the cooking chamber via a discharge opening for its disposal.

In the devices of the prior art, the hot vapor from the cooking chamber is fed to a siphon device with steam condensation, on the one hand to condense the steam and on the other hand to cool it together with the fat-water mixture of the vapor. Cooling down to a predetermined value is necessary because only liquid with a maximum temperature that is below that of the vapor discharged from the cooking chamber may be introduced into the sewage system of the house connection.

From the EP 1 717 518 B1 a cooking appliance with a cooking chamber drain and a siphon device is known, in which there is a water seal that serves to prevent odors or vapors from the sewage system from entering the cooking chamber. Furthermore, the water reservoir is also used to cool down the hot vapor.

With certain items to be cooked, as indicated above, a large amount of fat escapes from the item to be cooked, which can entail problems with disposal via the sewage house connection. In addition, this natural fat is suitable for further processing, for example in the manufacture of cosmetics, e.g. B. soap, or fuel and thus contributes to sustainability in the processing of such raw materials.

From the U.S. 8,997,730 B2 a cooking appliance is known in which there is the possibility of fat recovery by means of liposuction. In this cooking appliance, the vapor is drained off via a drain opening and a short pipe socket into a siphon device underneath, in which there is a water reservoir. A vapor catch tank is located below the drain opening, being separated from the water reservoir. In this collection container there is a drain opening which is connected to a liposuction line, via which the fat-water mixture can be drawn off to a collection container by means of a suction pump.

After completion of the respective cooking process or after completion of a plurality of cooking processes, the cooking chamber must be cleaned for reasons of hygiene. This can either be done manually by introducing an appropriate cleaning agent into the cooking chamber, distributing it manually and rinsing it out again using a water supply. However, automatic cleaning devices have proven to be particularly advantageous in the operation of canteen kitchens. In any case, the cleaning produces a liquid (powder-dissolved or otherwise dissolved) cleaning agent which, for reasons of hygiene, must be completely removed from the cooking chamber of the cooking appliance and the other cooking appliance components to be cleaned before another cooking process can be carried out.

The same elements and devices of the cooking appliance are used to discharge the cleaning liquid with the corresponding dissolved residues of the cooking process as those used to discharge the vapor. In the prior art mentioned above, this leads to the great disadvantage that the cleaning agent mixed with the dissolved residues from the cooking chamber also gets into the vapor collection container and is also sucked off. Residues of the cleaning agent thus get into the collected fat and contaminate this collected raw material for its further processing considerably.

The present invention is therefore based on the object of avoiding the disadvantages described above and of proposing a cooking appliance for commercial kitchens in the form of a combi steamer or a rotisserie appliance with a fat collecting device and fat recovery, which largely prevents cleaning residues from penetrating into the recovered fat or to mix with this. Furthermore, it is the object of the present invention to propose a corresponding grease collecting device for a commercial kitchen cooking appliance. Finally, it is also an object of the present invention to propose a method for operating a commercial kitchen cooking appliance, in particular a combi steamer or a rotisserie appliance with fat recovery, in which contamination of the recovered fat with cleaning agents is largely avoided.

In order to solve the problem, the present invention proposes a cooking appliance for commercial kitchens in the form of a combi-steamer with a cooking chamber for cooking food that can be arranged on a plurality of cooking levels, or in the form of a rotisserie appliance, with a cooking chamber for cooking food that can be arranged on a rotatable food support, with a heating device for heating the atmosphere in the cooking chamber, a device controller for controlling the Cooking appliance, a cooking chamber drain, which is located below a floor of the cooking chamber and is used to drain a fat-water mixture and gaseous components of the cooking chamber atmosphere from the cooking chamber, the cooking chamber drain extending from a drain opening in the floor or in the floor area of the cooking chamber to a siphon device, wherein a fat collecting device is provided which comprises at least one fat collecting container, at least one fat suction line, at least one suction pump and at least one fat discharge line, the fat suction line extending from the fat collecting container to the suction pump, the suction pump being set up to to convey the fat-water mixture sucked in via the liposuction line into the fat discharge line, and wherein the fat collecting device comprises a cleaning device which is set up to convey water at least via the liposuction line and the fat collecting container into the cooking chamber drain in the direction of the siphon device.

This advantageously ensures that cleaning agent residues are flushed out of the liposuction line and from the fat collection container and are discharged to the siphon device, so that the fat produced in a subsequent cooking process can be recovered without cleaning agent residues. This significantly increases the quality of the recovered fat and contributes significantly to the reusability of this fat.

As a result, the canteen kitchen operator can also achieve a corresponding price for the raw material that can be further processed, which reduces the purchase price of the food backwards.

The constructive design, such that the fat collecting container is arranged in front of the siphon device, results in the clear advantage that the fat content of the cooking chamber drain introduced into the siphon device is significantly reduced, with the fat content in the exhaust pipe also being significantly reduced. This can significantly increase the service life of the cooking appliance or its components, such as the drain pump of the siphon, the circulating pump of the cleaning system, such as seals, in particular the pumps, the water supply of the cleaning system or the temperature sensor.

In addition, the great advantage over canteen kitchen cooking appliances without fat recovery is maintained in that there is no need to separate fat before the cooking chamber drains into the domestic drainage duct.

There is also the advantage that no change to the already existing cooking processes is necessary and the cooking result is not impaired even with the fat collecting device according to the invention. The cooking quality is therefore not impaired.

Due to the fact that the grease collection container is located in the initial area of the cooking chamber drain, the liposuction can be carried out early and the further flow path up to the siphon device is freed from grease contamination at an early stage. For example, an initial portion of the grease tray is located within a distance of 80 to 120 mm from the center line of the drain opening of the cooking cavity, preferably at a distance of 30 to 40 mm from the center line of the drain opening.

Advantageously, the cooking space drain and the fat collecting container are made of metal material, which is particularly temperature-resistant, and the fat collecting container is welded to the cooking space drain. This results in a long-lasting connection between the fat collection container and the cooking space drain, while avoiding seals that may not be permanent, the connection area being particularly difficult to access due to the installation location below the cooking space.

Correspondingly, it is also advantageous that the liposuction line, which comprises a liposuction tube preferably made of metal, is welded to the fat collection container. This creates a particularly durable connection that is essentially maintenance-free.

Due to the fact that the end section of the fat collecting container is designed in the form of a ramp in the direction of the siphon device, the advantage of a streamlined design of the fat collecting container and its connection to the cooking chamber outlet is achieved. During backwashing by the cleaning device of the grease collecting device, the grease collecting container is flushed in the direction of the siphon device and the flushed water is routed to the siphon device. The discharge process is supported or facilitated by the ramp-shaped design of the grease section.

Various embodiments are possible for the configuration of the ramp-shaped end section. For example, the end section formed from three mutually inclined side faces. Alternatively, the ramped end portion may be conical. In a further alternative, the fat collecting container can be designed as an inclined and/or conical tube or as such a tube section which tapers in the direction of the siphon device.

Advantageously, a branch line for discharging gaseous portions of the fluid or vapor discharged from the cooking chamber into the cooking chamber drain branches off from the cooking chamber drain between the grease collecting container and the siphon device. As a result, the cooling capacity of the siphon device can advantageously be dimensioned to be smaller.

In this connection it is advantageous that the branch line comprises a first section which runs essentially horizontally with a slight incline of 1° to 5°, preferably of 2° to 2.5°. In principle, the hot exhaust air from the cooking chamber also contains fat in the form of fat droplets, and this exhaust air partially condenses in the branch line. Due to the slight incline, this condensate can possibly flow back. with fat can be reached back into the cooking space drain.

Furthermore, it is advantageous that the liposuction line extends at least partially at a slight gradient of 1° to 5°, preferably 1.5° to 2°, from the fat collection container to the suction pump. This ensures that the fat-water mixture does not flow back into the fat collecting tank as far as possible.

Furthermore, an advantage can be achieved in that the liposuction line and the first section of the branch line are arranged at a small distance from one another, preferably adjacent to one another. This has the advantage that the closer the branch line is to the liposuction line, the greater the heat transfer from the branch line heated by the exhaust air to the liposuction line, which means that the fat flowing through the liposuction line can be significantly reduced from solidifying and its flowability increased by the transferred heat is supported.

Furthermore, it is advantageous that the suction pump is designed as a pump through which flow can take place in both directions, as a result of which it is able to be flown through in the opposite direction to the pumping direction. The suction pump conveys the fat-water mixture from the fat collection container into the fat discharge line. If the pump inlet cannot be closed, there is a possibility that cleaning liquid will penetrate to the pump and collect there. Due to the fact that the suction pump can also be flown through in the opposite direction to the pumping direction, there is the possibility of flushing through the suction pump in this direction. Any residues of cleaning liquid that may have accumulated can thus be removed again.

In a preferred embodiment of the present invention, the fat discharge line comprises a riser pipe which is arranged at the pump outlet of the suction pump and extends upwards from there over a certain distance. This has two advantages, namely, firstly, that the penetration of cleaning liquid into the riser pipe is limited up to the height of the drain opening in the cooking chamber of the cooking appliance and, on the other hand, the extracted fat-water mixture is conveyed so far upwards that from there it can flow into a Fat collection container for collecting the extracted fat or fat-water mixture is made possible. Even if, in a space-saving configuration, the riser pipe is arranged essentially vertically upwards, inclined arrangements of the riser pipe are also possible within the scope of the invention.

The cleaning device of the grease collecting device advantageously has a water supply. Cooking appliances, in particular combi-steamers, always have a water supply in order to be able to generate steam in the cooking chamber. This is done by generating steam inside the cooking chamber or by introducing steam from outside the cooking chamber. Water is also required to clean the cooking chamber, for example using a hand shower or an automatic cleaning system.

Furthermore, it is advantageous that the water supply of the cleaning device of the fat collecting device has at least one water supply line, which opens into the riser pipe above the suction pump. In this way, the line harness that may have been occupied by the cleaning liquid, including the suction pump, can be reliably flushed through and freed of cleaning liquid residues.

If the suction pump has a closable pump inlet, cleaning liquid can be prevented from entering the pump by closing this pump inlet. This advantageously also creates the possibility of connecting the water supply line of the water supply of the cleaning device of the fat collecting device immediately before the pump inlet in order to initiate flushing of the fat suction line and the fat collecting container from there.

Furthermore, it is advantageous that the water supply of the cleaning device of the fat collecting device has at least one additional water supply line. Thus, in addition to the water supply line, which opens into the riser, a further water supply line can be provided, which opens directly into the fat collecting container and, if necessary. yet another water supply line can be provided, which opens into the liposuction line directly in front of the suction pump.

The water supply is equipped with at least one solenoid valve that controls the supply of fresh water to the at least one water supply line. Multiple solenoid valves control the water supply to multiple water supply lines.

In an alternative embodiment, the suction pump can advantageously be arranged at a level above the level of the discharge opening in the floor or floor area of the cooking chamber of the cooking appliance, the outlet end of the fat suction line being connected to the pump inlet via a connecting line. This has the advantage that cleaning liquid never gets to the suction pump and therefore does not have to be freed from it afterwards.

Alternatively, it is possible to arrange the suction pump between the cooking chamber floor and the floor of the appliance or below the floor of the appliance.

When the cleaning device of the cooking appliance is in operation, the suction pump is not in operation. This prevents cleaning agent from being sucked into the suction pump.

The suction pump is also not in operation when the cleaning device of the grease collecting device is in operation, which means that it can be flushed through unhindered, in particular when the water is fed into the riser pipe.

Another advantage of the present invention is that a heating device is provided on or in the fat collecting container, by means of which liquid non-fat components of the fat-water mixture drained from the cooking chamber can be evaporated. This achieves the advantage that the proportion of water in the fat-water mixture is further reduced and the concentration of fat during recovery can thus be increased.

It is also advantageous that the fat collecting device has a shut-off valve at the inlet of the water supply of the cleaning device in the liposuction line, so that after the liposuction line has been shut off, the cleaning device is able to clean the suction pump and the fat discharge line by flushing. The shut-off valve can advantageously be a multi-way valve that can assume a position in which the liposuction line and the fat collection container are flushed and another position in which the suction pump and the fat discharge line are flushed. If necessary, the shut-off valve can also be designed in such a way that it allows flushing to take place in both directions at the same time.

If the cooking appliance is used intensively and/or for a long time, there may be a risk of fat being deposited in unfavorable places. Advantageously, the water used for flushing the cleaning device of the grease collecting device can be heated, so that solidified grease can be made soluble again and rinsed out.

The sub-task set out above is also achieved by a fat collecting device for commercial kitchen cooking appliances, in particular combi-steamers or rotisserie appliances, which comprises at least one fat collecting container, at least one fat suction line, at least one suction pump and at least one fat discharge line, with the fat collecting container being attached to a cooking chamber drain of the cooking appliance in can be arranged in the vicinity of a drain opening in the floor or in the floor area of the cooking appliance, with the fat suction line extending from the fat collection container to the suction pump, with the suction pump being set up to convey the fat-water mixture sucked in via the fat suction line into the fat discharge line, and wherein the fat collecting device comprises a cleaning device which is set up to convey water at least via the fat suction line and the fat collecting container into the cooking chamber outlet in the direction of a siphon device at the end of the cooking chamber outlet of the cooking appliance.

There is thus the possibility of integrating a fat collecting system into cooking appliances, in which a recovery of fat or possibly also other substances is made possible by appropriate suction.

• - Sammeln des aus dem Garraum des Gargeräts über dessen Ablassöffnung im austretenden Fett-Wassergemischs in einem Fettauffangbehälter einer Fettauffangeinrichtung, der an einem Garraumablauf des Gargeräts angebracht ist,
• - Absaugen des Fett-Wassergemischs über wenigstens eine Fettabsaugleitung aus dem Fettauffangbehälter mittels einer, am Ende der Fettabsaugleitung angeordneten Absaugpumpe,
• - Ausbringen des von der Absaugpumpe angesaugten Fett-Wassergemischs über eine Fettausbringleitung zu einem Fettsammelbehälter, sowie
• - Durchführen eines Reinigungsprozesses der Fettauffangeinrichtung nach Beendigung eines Reinigungsprozesses des Gargeräts dadurch, dass Wasser in umgekehrter Richtung zu der Absaugrichtung zumindest durch die Fettabsaugleitung und den Fettauffangbehälter in den Garraumablauf in Richtung einer Siphoneinrichtung am Ende des Garraumablaufs des Gargeräts gefördert wird.

Finally, the present invention also includes a method for operating a commercial kitchen cooking appliance, in particular a combi steamer or a rotisserie appliance, and for collecting fat produced during the cooking process, with the following steps:

• - collecting the fat-water mixture escaping from the cooking chamber of the cooking appliance via its drain opening in a fat collecting container of a fat collecting device which is attached to a cooking chamber drain of the cooking appliance,
• - Suction of the fat-water mixture via at least one liposuction line from the fat collection container by means of a suction pump arranged at the end of the liposuction line,
• - Discharge of the fat-water mixture sucked in by the suction pump via a fat discharge line to a fat collection container, as well as
• - Carrying out a cleaning process of the fat collecting device after completion of a cleaning process of the cooking appliance in that water is conveyed in the opposite direction to the suction direction at least through the fat suction line and the fat collecting container into the cooking chamber drain in the direction of a siphon device at the end of the cooking chamber drain of the cooking appliance.

Advantageously, the use of the suction pump is clocked. The timing can be permanently preset or change over the course of the cooking program or cooking process. For example, suction is performed by pumping in a 60-second cycle: 30 seconds of pumping and a 30-second pause. Continuous operation is also possible for certain cooking steps. On the other hand, clocking below 50% is also possible, i.e. the pumping time is shorter than the pause.

It is therefore also advantageous that the clocking takes place as a function of the food to be cooked and/or the cooking process. In this way, the suction power can be adapted to the accumulation of fat, for example due to the food to be cooked (duck, goose) and/or the load in the cooking chamber and/or the course of the cooking process.

Furthermore, it is advantageous that the cleaning process of the fat collecting device is carried out both at the beginning and at the end of the cleaning process of the cooking appliance. The implementation at the beginning advantageously removes the fat-water mixture that still remains before the cleaning agent drained from the cooking chamber during the cleaning process of the cooking appliance penetrates, and the implementation at the end removes the remaining cleaning agent.

Because the grease collecting device is flushed through at the beginning of the cleaning process of the cooking appliance, the grease collecting device is rinsed with fresh water and some of the fresh water remains in the grease collecting container, in the fat suction line, in the suction pump and in a section of the riser pipe after the rinsing process has ended. If the cleaning of the cooking appliance is now initiated, the water present in the liposuction line makes it more difficult for the cleaning agent to penetrate into this liposuction line.

During the next liposuction process, after previously rinsing the fat collection device again, the available fresh water is conveyed into the fat collection container and only then is the sucked fat introduced there, due to the natural separating ability between fat and water, the water that has collected in the collection container can then be drained off accordingly and the separated fat remains.

• 1 eine perspektivische Ansicht eines Gargeräts in Form eines Kombidämpfers;
• 2 eine weitere perspektivische Ansicht des Gargeräts von 1 mit entfernter Garraumtür;
• 3 eine perspektivische Ansicht eines Gargeräts in Form eines großen Kombidämpfers mit Hordengestell;
• 4 eine schematische Prinzipdarstellung des Aufbaus einer Ausführungsform des erfindungsgemäßen Gargeräts in Form eines Kombidämpfers;
• 5 eine perspektivische Ansicht des Garraumablaufs und eine Teilansicht der erfindungsgemäßen Fettauffangeinrichtung mit Fettabsaugleitung;
• 6 eine Ansicht auf die Rückseite des Gargeräts in Form eines Kombidämpfers mit Fettabsaugpumpe, Fettausbringleitung und Wasserzuführung der Reinigungseinrichtung der Fettauffangeinrichtung.

Further details, features and advantages of the present invention result from the following description with reference to the attached drawing. It shows:

• 1 a perspective view of a cooking appliance in the form of a combi-steamer;
• 2 another perspective view of the cooking appliance from FIG 1 with the cooking compartment door removed;
• 3 a perspective view of a cooking appliance in the form of a large combi steamer with oven rack;
• 4 a schematic representation of the principle of the structure of an embodiment of the cooking appliance according to the invention in the form of a combi steamer;
• 5 a perspective view of the cooking chamber drain and a partial view of the fat collecting device according to the invention with fat suction line;
• 6 a view of the back of the cooking appliance in the form of a combi-steamer with liposuction pump, fat discharge line and water supply of the cleaning device of the fat collecting device.

In the figures, the same elements are provided with the same reference numbers.

In the 1 and 2 a conventional cooking appliance 1 is shown in the form of a combination steamer 3, which has a cooking chamber 3 for cooking food, which can be closed by a cooking chamber door 5. The cooking chamber door 5 has a door handle 8 for handling. In addition to the cooking chamber 3 is the so-called technical room 6, in which a drive device for a fan wheel 7, the device control with display and control panel 9 and a hand shower 11 with hand shower head 13 are arranged.

As can be seen, the hand shower head 13 is sunk into a niche-like receptacle 19 arranges and jumps in the in 1 and 2 illustrated rest position does not protrude over the front of the cooking appliance. Due to the niche-like receptacle 19, the hand shower head 13 is easy to grasp and can be pulled out together with part of a supply line (not shown). The cooking appliance has a water supply to which the hand shower 11 is connected, with water being able to be injected into the cooking chamber 3 via the hand shower 11, for example for carrying out a manual cleaning process.

How to continue 2 As can be seen, the cooking chamber 3 has a drain 15 in the area of its floor 4, through which not only the fat-water mixture formed from condensation water and the fat-water mixture formed by the cooking process from the food to be cooked during cooking, but also the gaseous cooking chamber atmosphere flow or flow out can, which together form the vapors defined here, and the cleaning medium generated during a cleaning process or the cleaning or washing liquor generated can be discharged from the cooking chamber 3.

Also indicated schematically is an internal temperature sensor 17 of the cooking appliance 1 on the floor 4 of the cooking chamber 3, which serves as a core temperature sensor in the exemplary embodiment shown.

At the top of the cooking chamber 1, an exhaust air outlet 21 can be seen, to which an exhaust air pipe opens. This is described in more detail below.

while in the 1 and 2 a cooking appliance 1 of relatively small size is shown in 3 a cooking appliance 1' of a large size is shown. A (suspended) frame 29 with a plurality of slide-in rails 31 can be seen through a transparent door pane 20 of the cooking chamber door 5 , record. A corresponding frame 29 is located on the opposite side and both frames 29 are part of a per se known rack frame of a rack trolley 23. This rack trolley 23 has a rectangular frame 25 on which a roller 27 is provided at each corner, with at least two of the Rollers 27 are rotatable. How out 3 As can be seen, the frame 29 has twenty shelf rails 31, which makes it possible to accommodate a large quantity of food to be cooked on up to twenty shelf levels. The cooking appliance 1' in turn rests on four corner supports 14.

Advantageously, for example, a collecting plate or collecting pan (not shown) can be used on the lowermost slide-in rails on both sides, which has an opening that is slightly offset downwards, whereby the liquid fat flows to this opening, which when the collecting pan is in the inserted state comes to lie above the drain opening 15 . As a result, the fat dripping from above can be caught and guided to the drain opening 15 and drained into it, as a result of which the cooking chamber floor 4 of the cooking appliance is wetted to a much lesser extent by fat. As a result, the bottom 4 of the cooking chamber 3 does not have to be cleaned as intensively, which makes cleaning the cooking chamber 3 much easier.

If a large amount of fatty food, such as ducks or geese, is cooked in such a large cooking appliance 1', a correspondingly large amount of released fat accumulates.

In 4 a basic structure of the two cooking appliances 1 and 1' shown is shown schematically, with the proportions of the individual components not being true to scale but only shown schematically food. The fan wheel 7 is driven by a motor 12, as a result of which the air or cooking chamber atmosphere 22 in the cooking chamber 3 can be circulated.

In the bottom 4 of the cooking chamber 3, the drain opening 15 is formed, to which a cooking chamber drain 33 is connected, which extends on the underside of the cooking chamber 3 to a siphon device 35 and opens into this. The siphon device 35 has a siphon container 36 in which a water seal 37 is located. As is known from the prior art, a dividing wall 41 is provided in the siphon container 36 and extends into the water reservoir 37 . This creates an odor trap across from the cooking appliance drain 43 which is connected to the drain duct of the house. A drain channel 44 from the siphon container 36 opens into this (not shown).

A water supply 45 is shown schematically, which is supplied with fresh water according to arrow 47 , this fresh water being able to be fed into the siphon container 36 via a water supply line 49 . To empty the siphon container 36, a drain pump 51 is provided, to which a drain line 53 is connected, via which the water reservoir 37 can be pumped out into the drain channel 44. After the siphon container 36 has been emptied, fresh water can be fed into the siphon container 36 via the water supply line 49 in order to build up the water reservoir 37 again.

This in 4 The cooking appliance shown schematically has an automatic cleaning unit Direction of the cooking appliance, which includes a supply line 55, with which liquid from the water reservoir 37 can be introduced into the cooking chamber 3 via a circulating pump 57. The water reservoir 37 is used to condense exhaust air, which is supplied via the cooking chamber outlet 33 of the siphon device 35, with corresponding portions of vapor also reaching the water reservoir 37 and acting on it. Therefore, to carry out the automatic cleaning of the cooking appliance, the water reservoir 37 is emptied by means of the drain pump 51 and fresh water is supplied via the water supply line 49 . This can then serve as the starting liquid for the automatic cleaning and, if necessary, the cooking chamber 3 by means of the circulating pump 57. be supplied multiple times.

Incidentally, such an automatic cleaning device of a combi-steamer is known from the prior art and is therefore not described further.

According to the present invention, the cooking appliance has a fat collecting device 59 which has a fat collecting container 61 which, as shown in FIG 4 visible, is arranged below the cooking chamber drain 33 and is preferably welded to it. A connection opening 71 for a liposuction tube 73, which is part of a liposuction line, is shown in dashed lines. Other connection options that create a permanent connection between the cooking chamber drain 33 and the grease collecting container 61 are within the scope of the invention.

Reference is now made to 5 , in which a part of the grease collecting device 59 according to the invention is shown in a perspective view.

To connect the cooking space drain 33 to the cooking space 3 , the cooking space drain 33 has a cooking space drain inlet 34 with a connecting flange 38 which can be screwed onto the cooking space floor 4 . The fat collecting container 61, which is welded to the tubular cooking chamber drain 33 in the illustrated embodiment, to which the invention is not limited, is located in the vicinity of the cooking chamber drain inlet 34. As shown in FIG 5 clearly visible, the fat collecting container 61 has a ramp-shaped end section 62 . Details on this are described further below.

How out 4 and 5 As can be seen, the cooking chamber drain 33 ends in a connection opening 58 for connection to the siphon container 36 of the siphon device 35.

How to continue from the 4 and 5 As can be seen, there is an opening 63 for a branch line 64 for the exhaust air from the cooking chamber 3 between the fat collection container 61 and the connection opening 58. This opening 63 forms the beginning of the exhaust air branch line 64, which has a first section 65, a second section 67 and a connecting piece 69 formed third section. An exhaust air pipe can be connected to this connecting piece 69 and leads to the exhaust air outlet 21 ( 1 until 3 ) leads.

The first section 65 of the exhaust air branch line 64 extends essentially horizontally or with a slight incline of 1° to 5°, preferably of 2° to 2.5°. This has the advantage that condensing steam from the exhaust air can flow back into the cooking chamber outlet 33 . The adjoining second section 67 of the exhaust air branch line 64 preferably runs at a similar or the same gradient as the first section 65. Condensate and, if appropriate, fat that has not solidified can also flow back from there. Furthermore, any cleaning agent that has penetrated into these sections 65 and 66 can also flow back into the cooking chamber outlet 33 via the cooking chamber outlet 33 when the cleaning agent is evacuated from the cooking chamber 3 and then continues to flow into the siphon device 35.

The fat collecting device 59 also includes a fat suction tube 73 which preferably opens out in the lower area of the fat collecting container 61 or creates the possibility for the fat-water mixture collected in the fat collecting container 61 to be able to flow off into the fat suction tube 73 . This is supported by the fact that the liposuction tube 73 extends at a slight incline of 1° to 5°, preferably 1.5° to 2°.

Reference is now made to 6 , which shows a perspective view of the rear side 10 of the cooking appliance 1 or 1', which is only partially shown. How out 6 As can be seen, the liposuction tube 73 extends beyond the back 10 of the cooking appliance and is connected to a suction pump 77 via a connecting tube section 75 . The suction pump 77 is used to suck off the fat-water mixture from the fat collection container 61 and to convey this mixture via a fat discharge line 82 into a fat collection container (not shown), such as a canister, collection bin, etc.

The suction pump 77 is connected to the device control via a corresponding control and supply cable 79, the cable 79 extending from the suction pump 77 via an opening 81 in the back 10 of the cooking appliance to the device control.

The Fettausbringleitung 82 has a riser pipe 83 that at the back 10 of the cooking appliance is held and extends substantially vertically upwards. This riser pipe 83 is followed by a discharge pipe 85, which in the exemplary embodiment extends essentially horizontally and at the end of which a check valve 87 is provided for shutting off the grease discharge line 82. A corresponding connecting hose and/or connecting pipe section can then be attached to the end of discharge pipe 85 connected to the grease collection tank for the collected grease or grease-water mixture.

According to the invention, the fat collection device 59 comprises a cleaning device with which at least the fat suction pipe 73 and the fat collection container 61 can be flushed in the opposite direction to the fat suction device in order to remove both residues of the fat-water mixture and residues of the cleaning agent that got into the cooking appliance during the cleaning process, so that contamination of the extracted fat or fat-water mixture can be avoided as far as possible during the next liposuction procedure.

From the water supply 45 ( 4 ) extends a water supply line 89 through an opening 90 in the rear wall 10 of the cooking appliance. This water supply line 89 opens into the riser pipe 83 above the suction pump 77. When water is supplied via the water supply line 89, the fat collecting device can thus be cleaned and flushed from above the suction pump 77 through the rising pipe 83, the connecting pipe section 75, the fat suction pipe 73 and the fat collecting container 61 take place, from which, flow-encouraged by the ramp-shaped end section 62, the flushing or flushed amount of liquid is discharged via the cooking chamber outlet 33 into the siphon device 35.

In an alternative embodiment, the suction pump 77 can have a shut-off device at its pump inlet 78 which prevents cleaning agent from penetrating the liposuction tube 73 and the connecting tube section 75 into the suction pump 77 . Correspondingly, the water supply line 89 can open into the connecting pipe section 75 immediately in front of the pump inlet 78 , flushing through to the siphon device 35 being able to take place from there.

How out 6 As can be seen, two lateral cover walls 91 are provided, which are connected to the rear wall 10 of the cooking appliance by means of screws 93 via corresponding holding elements 92 and thus enable a box-shaped structure which can be assembled with a corresponding cover wall (not shown). Advantageously, the entire arrangement of the suction pump 77 and its connections is then accessible for maintenance work without having to reach into the interior of the cooking appliance.

The present invention is not limited to the illustrated embodiments. For example, several water supply lines can be provided, one of which opens directly into the fat collection container 61 or the fat suction pipe 73 or another into the fat collection container 61 or into this fat suction pipe 73 .

In a further alternative embodiment, a multi-way valve can be provided at the pump inlet 78, with which water can be fed either into the connecting pipe section 75 and the liposuction pipe 73 or into the suction pump 77 and the fat discharge line 85 connected to it, one after the other or simultaneously.

In a further alternative embodiment, for example, the riser pipe 83 can be directly connected to the fat suction pipe 73 and the suction pump 77 can be arranged at the upper end of the riser pipe 83, specifically at a height that is above the height of the drain opening 15 of the cooking chamber 3. This prevents the cleaning liquid from penetrating as far as the suction pump 77 . The discharge pipe 85 is then connected to the outlet of the suction pump 77 .

With the present invention it is thus achieved that a recovery of fat from the cooking chamber is made possible, which is essentially or practically free of cleaning agent, the fat being released primarily from cooked food. This significantly increases the quality of the recovered fat for further processing, for example for cosmetics.

In addition, the considerable advantage is realized that the harmful grease load on both the drain pump and the circulating pump due to grease that has penetrated the water reservoir can be significantly reduced, with the corresponding seals also being able to be spared. The service life of the cooking appliance or the service life can thus be increased considerably.

There is also the great advantage that a (negative) influence on the cooking quality is avoided.

Reference List

1

cooking appliance

3

cooking chamber

4

oven floor

5

cooking chamber door

6

technical room

7

fan wheel

8th

door handle

9

Display and control panel

10

rear panel of the cooking appliance

11

hand shower

12

engine

13

hand shower head

14

Foot

15

drain hole

17

temperature sensor

19

niche-like recording of the hand shower head

20

transparent door panel

21

outlet exhaust air

22

cooking chamber atmosphere

23

rack trolley

25

frame

27

rotating casters

29

rack or rack

31

slide-in rails

32

shelf level.

33

cooking chamber drain

34

cavity drain entry

35

siphon device

36

siphon tank

37

water template

38

connecting flange

41

partition wall

43

cooking appliance drain

44

drain channel

45

water supply

47

Fresh water supply arrow

49

water supply line

51

drain pump

53

drain line

55

supply line

57

circulation pump

58

Connection opening to the siphon device

59

fat collection device

61

drip tray

62

ramped end section

63

Opening for exhaust air branch line

64

Exhaust air branch line

65

first section branch line exhaust air

67

second section branch line exhaust air

69

Connection piece for exhaust air pipe

71

Connection opening for liposuction tube

73

liposuction tube

75

connection pipe section

77

suction pump

78

pump inlet

79

Suction pump connection cable

81

opening

82

grease discharge line

83

riser

85

discharge tube

87

check valve

89

water supply line

90

opening

91

side panel

92

holding element

93

screw

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 1717518 B1 [0004]
• US8997730B2 [0006]

Claims (24)

Cooking appliance for commercial kitchens in the form of a combination steamer (1, 1'), with a cooking chamber (3) for cooking food, which can be arranged on a plurality of cooking levels (32), a heating device for heating the cooking chamber atmosphere, a device control for controlling the Cooking appliance, a cooking chamber drain (33), which is located below a floor (4) of the cooking chamber (3) and is used to drain a fat-water mixture and gaseous components of the cooking chamber atmosphere from the cooking chamber (3), with the cooking chamber drain (33) from a drain opening (15) in the floor (4) or in the floor area of the cooking chamber (3) to a siphon device (35), with a fat collecting device (59) being provided which has at least one fat collecting container (61), at least one fat suction line (73) , At least one suction pump (77) and at least one fat discharge line (82), wherein the fat suction line (73) extends from the fat collection container (61) to the suction pump (77), wherein the suction pump pe (77) is set up to convey the fat-water mixture sucked in via the liposuction line (73) into the fat discharge line (82), and wherein the fat collecting device (59) comprises a cleaning device which is set up to discharge water at least via the liposuction line (73 ) and to promote the fat collection container (61) in the cooking chamber drain (33) in the direction of the siphon device (35). Cooking appliance for canteen kitchens in the form of a rotisserie appliance, with a cooking space for cooking food, which can be arranged on a rotatable food support, a heating device for heating the cooking space atmosphere, a device controller for controlling the cooking device, a cooking space drain (33) located below a floor (4) of the cooking chamber (3) and is used to drain a mixture of fat and water and gaseous components of the cooking chamber atmosphere from the cooking chamber (3), with the cooking chamber drain (33) extending from a drain opening (15) in the floor (4) or in the floor area of the cooking chamber (3) up to one which comprises at least one fat collection container (61), at least one fat suction line (73), at least one suction pump (77) and at least one fat discharge line (82), the fat suction line (73) extending from the Fat collection container (61) extends to the suction pump (77), wherein the suction pump (77) is set up to the via the liposuction line (73) sucked fat-Wasserg chemically conveyed further into the fat discharge line (82), and wherein the fat collecting device (59) comprises a cleaning device which is set up to pump water at least via the fat suction line (73) and the fat collecting container (61) into the cooking chamber drain (33) in the direction of the siphon device (35 ) to promote. cooking appliance claim 1 or 2 , characterized in that the fat collection container (61) is located in the initial area of the cooking chamber outlet (33). Cooking appliance according to one of the preceding claims, characterized in that the cooking chamber drain (33) and the grease collecting container (61) are formed from metallic material and the grease collecting container (61) is welded to the cooking chamber drain (33). Cooking appliance according to one of the preceding claims, characterized in that the end section (62) of the grease collecting container (61) is constructed in the shape of a ramp in the direction of the siphon device (35). Cooking appliance according to one of the preceding claims, characterized in that a branch line (64) for discharging gaseous components of the fluid or vapor discharged from the cooking chamber into the cooking chamber outlet from the cooking chamber outlet (33) between the grease collecting container (61) and the siphon device (35 ) branches off. cooking appliance claim 6 , characterized in that the branch line (64) comprises a first section (65) which runs substantially horizontally with a slight incline of 1° to 5°, preferably 2° to 2.5°. Cooking appliance according to one of the preceding claims, characterized in that the fat suction line (73) extends from the fat collection container (61) to the suction pump (77) at least partially with a slight gradient of 1° to 5°, preferably 1.5° to 2° extends. Cooking device according to one of Claims 6 until 8th , characterized in that the liposuction line (73) and the first section of the branch line (65) are arranged at a small distance from one another, preferably adjacent to one another. Cooking appliance according to one of the preceding claims, characterized in that the suction pump (77) is designed as a pump through which flow can take place in both directions, as a result of which it is able to be flown through in the opposite direction to the pumping direction. Cooking appliance according to one of the preceding claims, characterized in that the fat discharge line (82) comprises a riser pipe (83) which is connected to the pump outlet of the suction pump (77) is arranged and extends from there over a certain section upwards. cooking appliance claim 11 , characterized in that the cleaning device of the grease collecting device has a water supply (45). cooking appliance claim 12 , characterized in that the water supply has at least one water supply line (89) which opens into the riser pipe (83) above the suction pump (77). Cooking appliance according to one of the preceding claims, characterized in that the suction pump (77) has a closable pump inlet (78). cooking appliance Claim 13 or 14 , characterized in that the water supply of the cleaning device of the fat collecting device has at least one further water supply line. Cooking device according to one of Claims 1 until 10 , characterized in that the suction pump (77) is arranged at a height which is above the height of the drain opening (15) in the floor (4) of the cooking chamber (3) of the cooking appliance, the outlet end of the fat suction line (73) being connected to the pump inlet (78) is connected via a connecting line (75). Cooking appliance according to one of the preceding claims, characterized in that a heating device is provided on or in the fat collection container (61), by means of which liquid non-fat components of the fat-water mixture drained from the cooking chamber can be evaporated. Cooking device according to one of Claims 1 until 8th or 12 until 14 , characterized in that the fat collecting device (59) has a shut-off valve at the inlet of the water supply to the cleaning device in the liposuction line, so that after the liposuction line has been shut off, the cleaning device is able to close the suction pump (77) and the fat discharge line (82) by flushing to clean. Cooking appliance according to one of the preceding claims, characterized in that the water used for flushing the cleaning device of the grease collecting device is heated. Fat collection device (59) for canteen kitchen cooking appliances, in particular combination steamers or rotisserie appliances, which comprises at least one fat collection container (61), at least one fat suction line (73), at least one suction pump (77) and at least one fat discharge line (82), the fat collection container (61) can be arranged on a cooking chamber drain (33) of the cooking appliance in the vicinity of a drain opening (15) in the floor (four) or in the floor area of the cooking appliance, the fat suction line (73) extending from the fat collection container (61) to the suction pump (77), wherein the suction pump (77) is set up to convey the fat-water mixture sucked in via the fat suction line (73) further into the fat discharge line (82), and the fat collecting device (59) comprises a cleaning device which is set up to collect water at least above the liposuction line (73) and the fat collection container (61) in the cooking chamber drain (33) in the direction of a siphon device (35) at the end of the cooking promote room drain of the cooking appliance. Method for operating a commercial kitchen cooking appliance, in particular a combi steamer or a rotisserie appliance, and for collecting fat produced during the cooking process, with the following steps: - Collecting the fat-water mixture emerging from the cooking chamber (three) of the cooking appliance (1, 1') via its drain opening (15) in a fat collecting container (61) of a fat collecting device (59) which is attached to a cooking chamber drain (33) of the cooking appliance , - Suction of the fat-water mixture via at least one fat suction line (73) from the fat collection container (61) by means of a suction pump (77) arranged at the end of the fat suction line, - Discharging the fat-water mixture sucked in by the suction pump (77) via a fat discharge line (82) to a fat collection container, and - Carrying out a cleaning process of the fat collecting device after the end of a cleaning process of the cooking appliance in that water flows in the opposite direction to the suction direction at least through the fat suction line (73) and the fat collecting container (61) into the cooking chamber drain (33) in the direction of a siphon device (35) at the end of the cooking space drain (33) of the cooking appliance. procedure after Claim 21 , characterized in that the use of the suction pump (77) is clocked. procedure after Claim 22 , characterized in that the clocking takes place as a function of the food to be cooked and/or the cooking process. Procedure according to one of Claims 21 until 23 , characterized in that the cleaning process of the grease catcher both is carried out at the beginning and at the end of the cleaning process of the cooking appliance.

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