DE102011017024A1 - Thermal equipment for a cooking equipment, particularly comb steamer and rotational grill device, particularly cooking-, baking-, heating- or grill equipment for food preparation, has cooking chamber with heating system - Google Patents

Abstract

The thermal equipment has a cooking chamber (1) with a heating system, a rotating skewer system, a motor for driving the skewer system, a temperature sensor (12) for detecting the temperature of the cooking climate present in the cooking chamber and a device controller (8) for controlling the cooking process. A core temperature sensor unit (10) is provided for detecting the core temperature of the foods to be grilled. The core temperature sensor unit is coupled with the device controller. The climate in the cooking chamber is coordinated by the device controller. Independent claims are also included for the following: (1) a burner device for burning gaseous fuels; (2) a heating unit for a flame-, particularly gas-heated device such as hot air baking or hot air steaming device for heat treatment of foods; (3) a heat exchanger unit for gas heated device for heat treatment of foods; (4) a gas heated device with a deflector; (5) a food heater for food preparation by hot steam; (6) a food preparation equipment with a heat exchanger-pipe system; (7) a cooking-, baking-, heating- or grilling equipment with a door unit; (8) a grill device for grilling foods such as meat or fish or poultry; and (9) a cleaning device for a food receiving- or preparing device, particularly cooking-, grilling- or warming equipment.

Description

The present invention relates to hot air heat exchangers by which a cooking climate is prepared by means of the energy provided by a gaseous or liquid fuel.

The EP 0856705 A1 discloses a heat exchanger having a deflection achieved by cantilever bending which is close to complete circulation and which carries the flow opposite the exhaust main flow to the outside. Due to the incomplete circulation of the exhaust pipe around the impeller in the first order results in the heat transfer flow, a gap that has a negative impact on the uniformity. Also, the deflection of the main flow is a resistance that reduces the power balance of the burner fan. Since the heat exchanger surrounds only one fan, the fan wheel distance is increased in devices with more than one fan by the double pipe guide between the fan wheels, which limits the number of fan wheels when installed in the device.

Out DE 10162952 A1 a hot air heat exchanger is known, which has a tube which wraps around a fan in several directions in one direction. Due to the falling temperature profile along the heat exchanger tube creates a temperature distribution that has irregularities to the flow outlets and thus has a negative impact on the uniformity. Also, the noise development susceptibility caused by the rectified exhaust main flow restricts the performance enhancement of this system. Since the heat exchanger surrounds only one fan, the fan wheel distance is increased in devices with more than one fan by the double pipe guide between the fan wheels, which limits the number of fan wheels when installed in the device.

The invention has for its object to provide a heat exchanger system for cooking appliances, which is characterized by a particularly favorable temperature distribution.

This object is achieved by a heat exchanger device for gas-fired devices for heat treatment of food, with a closable cooking chamber, with at least one fan at least one gas burner is positioned in a combustion chamber and at least one outgoing from the combustion chamber combustion chamber exit pipe with a manifold and / or a deflection box with at least one outgoing from the distributor and / or diversion box Gleichströmungs tube which propagates around the fan, this heat exchanger means characterized in that the combustion chamber outlet pipe divides after the distributor at least two subsequent tubes, of which DC flow tube is positioned at an angle C to the combustor exit tube and the counter flow tube is positioned at an angle D to the DC flow tube.

The inventive concept, a fuel-heated hot air heat exchanger for heating a cooking climate is created which is used in cooking appliances such as combi steamer, oven, grill, etc. The erfindungsgeäße heat exchanger is characterized by a high efficiency in the heat transfer from the exhaust gas of the heating medium in the cooking climate. Furthermore, a particularly advantageous heat distribution in the cooking chamber is achieved by the inventive concept. The concept according to the invention also reduces the noise emission. A further advantage of the invention is that the exhaust gas flow is distributed over a large heat exchanger surface and that in a turbulent flow the flow resistance does not limit the power capacity of the burner system. A further result of the invention is in devices in which a use of multiple fan wheels for uniformity is necessary due to the hot-air heat exchanger system, this fan number is not limited and yet the heat transfer surfaces between the fan wheels for steam development and better uniformity can be used.

Further, as advantageous details and features of the invention will become apparent from the dependent claims and their combination and from the following description of preferred embodiments of the invention, which are explained in more detail with reference to schematic drawings. Hereby show:
Note: At the 1 to 4 All surrounding components such as housing parts, fasteners and the like are omitted.

1 (PRIOR ART) Schematic representation of the temperature distribution along the exhaust pipe of the hot air heat exchanger after DE 10162952 A1 , from which it can be seen that the temperature distribution at one and also in several turns around the fan around a, non-uniform course in the radial direction to the fan. The temperature values A10, A20, A30 and A11 measured in the polar coordinates a1; a2; a3 have a sloping tendency due to the heat release from the Angasrohr, which has summed up even for several turns an irregularity. The following applies: A10>A20>A30; A10 + A11>A30;

2 (PRIOR ART) Schematic representation of the temperature distribution along the exhaust pipe of the hot air heat exchanger after EP 0856705 A1 , from which it can be seen that the temperature distribution at one and consequently also at several turns around the fan around a temperature gap along the Winkesl a5 and represents by the deflection of 180 ° from one pipe to another a large flow resistance. Again, A10>A20>A30;

3 a schematic representation of a temperature profile along the exhaust pipes, which is distributed according to the angle a4 (a4> 0 °) in at least two counter-rotating pipes. The main exhaust gas flow ( 26 ) splits into the reduced rectification exhaust gas flow ( 27 ) and the opposing exhaust gas flow ( 28 ) on. There is no temperature gap of the first order and for the angle a4> 360 °, the temperature distribution is optimized.

4 a schematic representation of a hot air tube heat exchanger after in the 3 described principle. From the burner ( 8th ) in the combustion chamber ( 7 ) flowing exhaust gases form the main exhaust gas flow ( 26 ) through the combustion chamber exit pipe ( 12 ) to the distributor ( 13 ) is guided. In this distributor ( 13 ), the main exhaust gas flow ( 26 ) into at least one rectifying exhaust gas flow ( 27 ) and at least one opposing exhaust gas flow ( 28 ) divided. These currents ( 27 ; 28 ) run in the exhaust collector ( 22 ) and leave the system in the exit tube ( 23 ). The fan wheel ( 2 ) is looped through the pipe system. The burner ( 8th ) is premix burner with the radial ( 9 ) and / or the axial ( 10 )Output. The distributor may have a tubular shape and / or a box shape. The redirection ( 16 ) can be a free-standing bend and / or a deflection box ( 17 ) be. The co-flow tube ( 20 ) can be round and / or polygonal around the fan ( 2 ) and the angle C ( 56 ) between the co-flow tube ( 20 ) and the combustion chamber exit tube ( 12 ) is less than 135 °. The angle D ( 57 ) between the co-flow tube ( 20 ) and the countercurrent tube ( 21 ) is greater than or equal to 135 °.

5 a schematic representation of a hot air tube heat exchanger in the after the distributor ( 13 ) the rectification and countercurrent flows are distributed into two tubes each (four tubes in total). The 5.1 schematically shows the front view, the 5.2 the side view of the facing pipe system ( 21.1 ; 21.2 ) and the 5.3 the side view of the co-flow pipe system ( 20.1 ; 20.2 ).

6 a schematic representation of a hot air tube heat exchanger in combination with more than one fan ( 2 ). There are two independent systems of heat exchangers, each of which has left and right pipe clamps ( 52 ) and the separating plates ( 53 ), which separate the flows from one another and at the same time constitute the heat exchanger surface for the water evaporation. The distributor ( 13.1 ) has the combustion chamber exit tube ( 12 ) as input and at least one pipe with the deflection ( 16 ) as an exit. Shown are two exit pipes leading to the main exhaust flow ( 26 ) first divert the exhaust gases into the opposite direction ( 28 ) and after a second diversion ( 16.1 ) redirect the exhaust gases in the direction parallel to the main exhaust flow direction. The number of pipes before and after the distributor ( 16 ; 16.1 ) can be different. The 6.1 shows the front view, the 6.2 the side view. The main Angasströmung ( 26 ) distributed in two subsequent flows. These two flows can be after the distributor ( 16.1 ) in at least one flow. The combustion chamber ( 7 ) does not exceed the speed indicated by the axes of the fan wheels ( 2 ) going level ( 58 ) and communicates with the combustion chamber of the plane ( 58 ) mirror-like system not. The drawn diversion ( 16 ) as a cantilevered bend can by a deflection box ( 17 ) be replaced. The 6.1 shows a schematic representation of the front view, the 6.1 A schematic representation of the section AA ( 54 ), so that it can be seen that the combustion chamber raw ( 12 ) after the distributor ( 13.1 ) through two counterflow tubes ( 21 ), which is placed in an exhaust manifold ( 22 ) and of which only one output tube ( 23 ) leads the exhaust gases to the outside.

LIST OF REFERENCE NUMBERS

1

cooking chamber

2

fan

3

4

5

6

7

combustion chamber

8th

Burner with radial and axial exit from the gas-air mixture

9

Radial outlet of the gas-air mixture

10

Axial outlet of the gas-air mixture

11

12

Combustor outlet pipe

13

Distributor for equal and opposite direction

13.1

Distributor for same directions

14

Cocurrent output

15

Contrary flow output

16

redirection

16.1

second diversion

17

diversion box

18

19

20

Direct flow pipe

20.1

Constant flow pipe in front

20.2

DC flow pipe at the rear

21

Contrary flow pipe

21.1

Counterflow pipe in front

21.2

Counterflow pipe behind

22

collector

23

outlet pipe

24

25

26

Main exhaust flow

27

Rectification exhaust gas flow

27.1

Flow that is parallel to the main exhaust flow

28

Contrary directional exhaust gas flow

29

Flow in the diversion

30

Output flow

31

32

Temperature profile along the main flow tube

33

Temperature profile along the co-flow tube

34

Temperature profile along the countercurrent tube

35

Angle a1

36

Angle a2

37

Angle a3

38

Angle a4

39

Angle a5

40

41

42

A10: Temperature of the exhaust gas in the main flow pipe at the angle a1

43

A20: temperature of the exhaust gas in the main flow pipe at angle a2

44

A30: Temperature of the exhaust gas in the main flow pipe at the angle a3

45

A40: Temperature of the exhaust gas in the co-flow tube at angle a4

46

A11: Temperature of the exhaust gas in the co-flow pipe at the coordinate of the angle a1

47

48

49

B20: Temperature of the exhaust gas in the counterflow pipe at the angle a2

50

B30: Temperature of the exhaust gas in the counterflow pipe at the angle a3

51

52

pipe clamp

53

Divider

54

Section A-A

55

56

Bending angle C between the combustion chamber exit pipe ( 12 ) and the co-flow tube ( 20 ); C <135 °

57

Bending angle D between the co-flow tube ( 20 ) and the counterflow tube (FIG. 21 ); D = or> 135 °

58

vertical plane G

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• EP 0856705 A1 [0002, 0009]
• DE 10162952 A1 [0003, 0008]

Claims (10)

Heat exchanger device for flame - in particular gas-heated devices for heat treatment of food, with a closable cooking chamber ( 1 ), with at least one fan ( 2 ), at least one gas burner ( 8th ) in a combustion chamber ( 7 ) and at least one, from the combustion chamber ( 7 ) outgoing combustion chamber exit tube ( 12 ) with a distributor ( 13 ) and / or a deflection box ( 17 ) with at least one of the distributor ( 13 ) and / or deflection box ( 17 ) outgoing co-flow tube ( 20 ) which propagates around the fan wheel, characterized in that the combustion chamber exit tube ( 12 ) according to the distributor ( 13 ) at least on two subsequent tubes ( 20 ; 21 ), of which the co-flow tube ( 20 ) at an angle C ( 56 ) to the combustion chamber exit tube ( 12 ) and the countercurrent tube ( 21 ) at an angle D ( 57 ) to the co-flow tube ( 20 ) is positioned. Heat exchanger device for gas-heated devices for heat treatment of food, with a closable cooking chamber ( 1 ), with at least one fan ( 2 ), at least one gas burner ( 8th ) in a through the axis of the fan ( 2 ) vertical level ( 58 ) not exceeding combustion chamber ( 7 ) and at least one, from the combustion chamber ( 7 ) outgoing combustion chamber exit tube ( 12 ) with at least one distributor ( 13.1 ) and / or a deflection box ( 17 ) and with at least one of the distributor ( 13 ) and / or from the deflection box ( 17 ) outgoing counterflow tube ( 21 ) that the fan wheel ( 2 ) is not completely circumscribed, characterized in that the countercurrent tube ( 21 ) and the co-flow tube ( 27.1 ) outside the fan wheel ( 2 ) meandering. Heat exchanger device for gas-heated devices for heat treatment of food, with a closable cooking chamber ( 1 ), with at least one fan ( 2 ), at least one gas burner ( 8th ) in a through the axis of the fan ( 2 ) vertical level ( 58 ) not exceeding combustion chamber ( 7 ) and at least one, from the combustion chamber ( 7 ) outgoing combustion chamber outlet pipe ( 12 ) with at least one distributor ( 13.1 ) and / or a distribution box ( 17 ) and with at least one of the distributor ( 13 ) and / or distribution box ( 17 ) outgoing counterflow tube ( 21 ) that the fan wheel ( 2 ) does not completely circulate and clamp with at least one set of pipe ( 52 ) with the dividing plates connected to the pipe clamps ( 53 ), characterized in that the pipe clamps ( 52 ) to the combustion chamber ( 7 ) and / or to the combustion chamber exit tube ( 12 ) and / or to countercurrent tube ( 21 ) and / or to co-flow tube ( 27.1 ) are attached. Device according to the preceding claims, characterized in that the number of in the distributor ( 17 ) opening pipes differ from the number of distributors ( 17 ) can be exiting pipes. Device according to the preceding claims, characterized in that the deflection ( 16 ) and or ( 16.1 ) can be designed as a cantilevered bend. Device according to the preceding claims, characterized in that the burner ( 8th ) a Vormischbrenner is provided with a cylindrical or a concave-convex profile. Device according to the preceding claims, characterized in that the Gleichströmungs- and / or countercurrent tubes have a round and / or oval and / or straight and / or spirally drawn profile Device according to claim 1, characterized in that the co-flow tube ( 20 ) and / or the countercurrent tube ( 21 ) around the fan wheel ( 2 ) can be wrapped several times spirally. Heat exchanger device for flame - in particular gas-heated devices for heat treatment of food, with a closable cooking chamber ( 1 ), with at least one fan ( 2 ), at least one gas burner ( 8th ) in a combustion chamber ( 7 ) and at least one, from the combustion chamber ( 7 ) outgoing combustion chamber exit tube ( 12 ) Wherein the effluent from the combustion chamber exhaust gas flow is divided into two partial streams and these two partial streams are guided around the fan wheel in opposite directions of rotation. Heat exchanger device for flame, in particular gas-heated devices for heat treatment of food, with a closable cooking chamber ( 1 ), with at least one fan ( 2 ), at least one gas burner ( 8th ) in a combustion chamber ( 7 ) and at least one, from the combustion chamber ( 7 ) outgoing combustion chamber exit tube ( 12 ) wherein the effluent from the exhaust pipe exhaust stream is divided and a partial flow created here around the output pipe 12 is guided around so that this partial flow of a flow in the output tube ( 12 ) receives opposite sense of rotation.

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