Spiral oven

Abstract

The utility model discloses a spiral oven which comprises a heating unit, the heating unit comprises a spiral heating channel, a spiral conveyer and a coil, the two ends of the spiral heating channel are open, the spiral conveyer is arranged in the heating channel, the coil is wound outside the spiral channel, and the side wall of the heating channel is made of electromagnetic induction materials. A temperature sensor is arranged in the heating channel, the coil and the temperature sensor are connected with a variable-frequency electromagnetic heater, the heating power can be accurately controlled through the variable-frequency electromagnetic heater, power on and power off of the coil can be controlled, accurate control over the temperature in the oven is achieved, and it is ensured that food is evenly heated in the baking process; and the condition of over-baking or incomplete baking is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing equipment, in particular to a spiral oven. Background Art

[0002] At present, food is usually baked in an oven. After each batch of food is baked, the baked food needs to be taken out, and then the food to be baked is put into the oven and then baked. Therefore, this oven has low efficiency and cannot achieve continuous production.

[0003] Therefore, an electromagnetic oven has emerged, such as the spiral food baking oven disclosed in the patent with the publication number CN2302658Y, which is provided with a furnace body, a spiral ascending track is provided in the furnace body, a mesh belt for placing food is provided on the track, the mesh belt drives the food to move in a spiral shape, the food to be baked enters from one end of the mesh belt, and the baked food is sent out from the other end of the mesh belt, thereby realizing continuous production and improving production efficiency. However, since it uses hot air entering from the lower part of the furnace body for heating, the temperature in the furnace is uneven, high at the bottom and low at the top, which leads to uneven temperature when baking food.

[0004] The current heating uses natural gas or resistive heating elements (such as electric heating tubes) to provide heat for the oven. When natural gas is used for baking, it contains a small amount of hydrogen sulfide, which reacts with oxygen in the air after combustion to produce sulfur dioxide, which will pollute the baked food and affect the health of the eater. When resistive heating elements are used for baking, the thermal efficiency of electric heating is low, which wastes electricity and the baking is uneven. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a spiral baking oven, which is used to solve the problem of uneven baking in the current spiral food baking oven.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A spiral oven comprises a heating unit, wherein the heating unit comprises a spiral heating channel with openings at both ends, a spiral conveyor arranged in the heating channel and a coil wound outside the spiral channel, and the side wall of the heating channel is made of electromagnetic induction material.

[0008] Furthermore, the side wall of the heating channel includes a vertical outer cylinder, an inner cylinder sleeved in the outer cylinder, a top plate arranged at the top of the outer cylinder and a bottom plate arranged at the bottom of the outer cylinder, the top of the inner cylinder and the top of the outer cylinder are fixedly connected to the top plate, the bottom of the inner cylinder and the bottom of the outer cylinder are fixedly connected to the bottom plate, an upper window for allowing the upper end of the screw conveyor to pass through is provided on the upper part of the top plate or the outer cylinder, and a lower window for allowing the lower end of the screw conveyor to pass through is provided on the lower part of the bottom plate or the outer cylinder, and the coil is wound along the outer side of the outer cylinder, the upper side of the top plate, the inner side of the inner cylinder and the lower side of the bottom plate.

[0009] Furthermore, the heating channels are two nested inside and outside, a vertical spacing cylinder is provided between the inner cylinder and the outer cylinder, the two heating channels are respectively located between the inner cylinder and the spacing cylinder and between the spacing cylinder and the outer cylinder, and there are two screw conveyors, which are respectively arranged in the corresponding heating channels.

[0010] Furthermore, both ends of the screw conveyor are connected to form a closed-loop transmission for the materials placed thereon.

[0011] Furthermore, a vertical third conveyor is provided beside the spiral channel, and two ports of the third conveyor correspond to the two ends of the spiral conveyor respectively.

[0012] Furthermore, the two heating units are symmetrically arranged, the upper ends of the screw conveyors of the two heating units correspond to each other, the lower ends of the screw conveyors of the two heating units correspond to each other, and the conveying directions of the screw conveyors of the two heating units are opposite.

[0013] Furthermore, the side wall of the heating channel is a spiral tube, and the screw conveyor is arranged in the spiral tube.

[0014] Furthermore, there are two heating channels arranged in the spiral tube, and there are two screw conveyors, which are respectively arranged in corresponding heating channels.

[0015] Furthermore, a vent hole is provided on the side wall of the heating channel, and a temperature sensor is provided in the heating channel.

[0016] Furthermore, the heating channel is coated with a thermal insulation layer, and the thermal insulation layer is located between the heating channel and the coil.

[0017] The positive effects of the utility model are:

[0018] 1. The utility model is provided with a spiral heating channel, a spiral conveyor is provided in the heating channel, a coil is wound on the heating channel, a temperature sensor is provided in the heating channel, and a variable frequency electromagnetic heater is connected to the coil and the temperature sensor. The variable frequency electromagnetic heater can accurately control the heating power and the power on and off of the coil to achieve accurate control of the temperature in the oven, ensuring that the food is heated evenly during the baking process to avoid over-baking or under-baking. During the heating process, the heating channel is located in the coil, so that the food inside it is evenly heated.

[0019] 2. There are two heating channels arranged in the spiral tube, and the two heating channels are separated from each other. A screw conveyor is provided in each heating channel. The two screw conveyors can convey different types of food or food of different flavors. The two foods are heated in independent heating channels respectively, so that the utility model can bake two kinds of food at the same time without mixing flavors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of Example 1;

[0021] Figure 2 is a cross-sectional view of the BB portion in Example 1;

[0022] Figure 3 is a schematic structural diagram of Example 2;

[0023] Figure 4 is a schematic diagram of the connection between two screw conveyors and a third conveyor in Example 2;

[0024] Figure 5 is a schematic diagram of the appearance of Example 3;

[0025] Figure 6 yes Figure 5 Cross-sectional view of the middle AA part;

[0026] Figure 7 is a schematic structural diagram of Example 4;

[0027] 1. Bottom plate; 2. Coil; 3. Outer cylinder; 4. Screw conveyor; 5. Inner cylinder; 6. Top plate; 7. First conveyor; 8. Third conveyor; 9. Second conveyor; 10. Spiral tube; 11. Spacer cylinder; 12. Upper window; 13. Lower window; 15. Vent; 16. Temperature sensor. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1 and Figure 2As shown, a spiral oven includes a heating unit, wherein the heating unit includes a spiral heating channel 14 with openings at both ends, a screw conveyor 4 arranged in the heating channel 14, and a coil 2 wound around the spiral channel. The screw conveyor 4 is a chain plate type screw conveyor. The side wall of the heating channel 14 is made of electromagnetic induction material (such as iron), and the coil 2 is passed with alternating current.

[0030] The side wall of the heating channel 14 includes a vertical cylindrical outer cylinder 3, a cylindrical inner cylinder 5 sleeved in the outer cylinder 3, a circular top plate 6 arranged at the top of the outer cylinder 3, and a circular bottom plate 1 arranged at the bottom of the outer cylinder 3. The top of the inner cylinder 5 and the top of the outer cylinder 3 are both fixedly connected to the top plate 6, and the bottom of the inner cylinder 5 and the bottom of the outer cylinder 3 are both fixedly connected to the bottom plate 1. An upper window 12 for the upper end of the screw conveyor 4 to pass through is provided on the upper part of the outer cylinder 3, and a lower window 13 for the lower end of the screw conveyor 4 to pass through is provided on the lower part of the outer cylinder 3. The coil 2 sequentially passes around the outer side of the outer cylinder 3, the upper side of the top plate 6, the inner hole of the top plate 6, the inner hole of the inner cylinder 5, the inner hole of the bottom plate 1, and the lower side of the bottom plate 1.

[0031] A temperature sensor 16 is provided on the inner wall of the outer cylinder 3. The utility model is also provided with a variable frequency electromagnetic heater. The variable frequency electromagnetic heater converts alternating current into high frequency current through a variable frequency circuit, and generates an alternating magnetic field through a coil 2. The top plate 6, the bottom plate 1, the inner cylinder 5, the outer cylinder 3, and the chain plate of the screw conveyor 4 placed in the magnetic field will generate electromagnetic induction. The eddy current generated by the electromagnetic induction will evenly heat the top plate 6, the inner cylinder 5, the outer cylinder 3, and the chain plate of the screw conveyor 4, so that the temperature inside the oven is uniform. In this process, electrical energy is converted into thermal energy, so that the food placed on the screw conveyor 4 is heated.

[0032] Combined with the temperature signal fed back by the temperature sensor 16, the variable frequency electromagnetic heater can accurately control the heating power and control the on and off of the coil 2, so as to achieve accurate control of the temperature in the oven, ensure that the food is heated evenly during the baking process, and avoid over-baking or under-baking. In order to reduce heat loss, an insulation layer can be set outside the top plate 6, the bottom plate 1, the inner cylinder 5 and the outer cylinder 3 to improve the insulation performance of the oven, further improve the heating efficiency, and save electricity.

[0033] The conveying direction of the screw conveyor 4 can be from bottom to top or from top to bottom. Food is put into one end of the screw conveyor 4, and the baked food is sent out from the other end of the screw conveyor 4, thereby achieving continuous baking of food and improving production efficiency.

[0034] The side wall of the heating channel 14 is also provided with ventilation holes 15 for discharging water vapor or gas generated during the baking of food.

[0035] A vertical third conveyor 8 is provided beside the spiral channel, and the two ports of the third conveyor 8 correspond to the two ends of the spiral conveyor 4, so as to realize the circulation of food and increase the baking time. The third conveyor 8 can be a chain plate elevator or other types of conveyors, which can be vertical or inclined, and can be specifically configured according to the positions of the two ends of the spiral conveyor 4, which are all existing technologies and will not be described in detail here.

[0036] Figure 1 and Figure 2 The third conveyor 8 adopts a vertical elevator. To facilitate its connection with the screw conveyor 4, a first conveyor 7 is provided at the upper end of the screw conveyor 4 and the upper end of the third conveyor 8, and a second conveyor 9 is provided at the lower end of the screw conveyor 4 and the lower end of the third conveyor 8.

[0037] Example 2

[0038] like Figure 3 and Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:

[0039] The heating channels 14 are two nested inside and outside, a vertical spacing cylinder 11 is provided between the inner cylinder 5 and the outer cylinder 3, the two heating channels 14 are respectively located between the inner cylinder 5 and the spacing cylinder 11 and between the spacing cylinder 11 and the outer cylinder 3, and there are two screw conveyors 4, which are respectively arranged in the corresponding heating channels 14.

[0040] The side wall of the partition passage 11 is provided with an opening for passing the end of the screw conveyor 4 at a position corresponding to the end of the inner screw conveyor 4. There are two third conveyors 8, and the two third conveyors 8 are connected to the corresponding screw conveyors 4 respectively.

[0041] The inner wall of the inner cylinder 5 is also provided with ventilation holes 15. The two screw conveyors 4 can convey different types of food or food of different tastes, and the two kinds of food are heated in independent heating channels 14 respectively, so that the utility model can bake two kinds of food at the same time without mixing flavors.

[0042] Example 3

[0043] like Figure 5 and Figure 6 As shown, the difference between this embodiment and embodiment 1 is that:

[0044] The side wall of the heating channel 14 is a spiral tube 10, and the screw conveyor 4 is arranged in the spiral tube 10. There are two heating channels 14 arranged in the spiral tube 10, and the two heating channels 14 are arranged up and down and separated from each other. There are two screw conveyors 4, and the two screw conveyors 4 are respectively arranged in the corresponding heating channels 14.

[0045] In this embodiment, the structure is simpler and the manufacturing cost is lower.

[0046] Example 4

[0047] like Figure 7 As shown, the difference between this embodiment and embodiment 1 is that:

[0048] The third conveyor 8 is no longer provided. The heating units are symmetrically arranged, the upper ends of the screw conveyors 4 of the two heating units correspond to each other, the lower ends of the screw conveyors 4 of the two heating units correspond to each other, and the conveying directions of the screw conveyors 4 of the two heating units are opposite.

[0049] Therefore, the two heating units form a closed cycle, and both can heat the food, prolong the heating time, and reduce the heat loss of the food when it is transferred at both ends of the spiral conveyor 4. Under the premise of meeting the heating requirements, the overall height of the utility model can be reduced.

[0050] The above-mentioned embodiments describe content in a relatively detailed and specific manner, and express the preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, and their purpose is to enable technicians in this field to understand the content of the present utility model and implement it accordingly, but they are not limited to the present utility model. The patent scope of the present utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made to the spirit disclosed by the present utility model, for researchers or technicians in this field, without departing from the structure of the present utility model, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present utility model.

Claims

1. A spiral oven, characterized in that: The heating unit comprises a heating unit, the heating unit comprising a spiral heating channel (14) with openings at both ends, a spiral conveyor (4) arranged in the heating channel (14), and a coil (2) wound around the spiral channel, the side wall of the heating channel (14) being made of an electromagnetic induction material; the side wall of the heating channel (14) comprising a vertical outer cylinder (3), an inner cylinder (5) sleeved in the outer cylinder (3), a top plate (6) arranged at the top of the outer cylinder (3), and a bottom plate (1) arranged at the bottom of the outer cylinder (3), the top of the inner cylinder (5) The top of the inner cylinder (5) and the outer cylinder (3) are fixedly connected to the top plate (6), the bottom of the inner cylinder (5) and the bottom of the outer cylinder (3) are fixedly connected to the bottom plate (1), an upper window (12) for allowing the upper end of the screw conveyor (4) to pass through is provided on the upper part of the top plate (6) or the outer cylinder (3), and a lower window (13) for allowing the lower end of the screw conveyor (4) to pass through is provided on the lower part of the bottom plate (1) or the outer cylinder (3), and the coil (2) is wound along the outer side of the outer cylinder (3), the upper side of the top plate (6), the inner side of the inner cylinder (5) and the lower side of the bottom plate (1).

2. A spiral oven according to claim 1, characterized in that: The heating channels (14) are two nested inside and outside, a vertical spacing cylinder (11) is provided between the inner cylinder (5) and the outer cylinder (3), the two heating channels (14) are respectively located between the inner cylinder (5) and the spacing cylinder (11) and between the spacing cylinder (11) and the outer cylinder (3), and there are two screw conveyors (4), which are respectively arranged in corresponding heating channels (14).

3. The spiral oven according to claim 1, characterized in that: The two ends of the screw conveyor (4) are connected to form a closed-loop conveyance for the material placed thereon.

4. A spiral oven according to claim 3, characterized in that: A vertical third conveyor (8) is provided on one side of the spiral channel, and two ports of the third conveyor (8) correspond to the two ends of the spiral conveyor (4) respectively.

5. A spiral oven according to claim 4, characterized in that: The two heating units are symmetrically arranged, the upper ends of the screw conveyors (4) of the two heating units correspond to each other, the lower ends of the screw conveyors (4) of the two heating units correspond to each other, and the conveying directions of the screw conveyors (4) of the two heating units are opposite.

6. The spiral oven according to claim 1, characterized in that: The side wall of the heating channel (14) is a spiral tube (10), and the screw conveyor (4) is arranged inside the spiral tube (10).

7. The spiral oven according to claim 4, characterized in that: There are two heating channels (14) arranged in the spiral tube (10), there are two screw conveyors (4), and the two screw conveyors (4) are respectively arranged in corresponding heating channels (14).

8. The spiral oven according to claim 1, characterized in that: A vent hole (15) is provided on the side wall of the heating channel (14), and a temperature sensor (16) is provided in the heating channel (14).

9. The spiral oven according to claim 1, characterized in that: The heating channel (14) is coated with a thermal insulation layer, and the thermal insulation layer is located between the heating channel (14) and the coil (2).

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