Hot air circulation oven

Abstract

The invention relates to a hot air circulation oven which comprises a box body, a circulating fan, a temperature sensor and a resistance wire which is electrified to generate heat are arranged in the box body, the circulating fan comprises a fan barrel which is vertically arranged, the circulating fan further comprises a fan impeller which is arranged on the inner side of the fan barrel, the rotating axis of the fan impeller extends in the vertical direction, and the fan barrel is a square barrel. A rotating support is rotationally assembled on the upper side of the fan barrel on the box body and driven by a first motor, the rotating support and the fan impeller are coaxially arranged, a heating resistance wire with the axis horizontally arranged is arranged on the rotating support, and the axial length of the heating resistance wire is not smaller than the diagonal length of the fan barrel. When the rotating support drives the heating resistance wire to rotate, the length of the vertical projection of the heating resistance wire on the fan barrel changes. According to the hot air circulation oven, the heat of circulating air can be adjusted.

Description

Technical Field

[0001] The invention relates to food baking equipment, in particular to a hot air circulation oven. Background Art

[0002] An oven is a common food baking device, which includes a box body, in which a temperature sensor and a resistance wire that generates heat when powered are arranged. In order to make the heat more uniform in the box body, a circulating fan is usually also arranged in the oven.

[0003] When in use, the resistance wire is energized to generate heat, and the circulating fan circulates the heat throughout the box, thereby evenly baking and heating the food in the box. The existing hot air circulation oven has the following problems: when in use, the heating temperature of the oven is set, and when the heating temperature is reached, the resistance wire is powered off, and when it is lower than the heating temperature, the resistance wire is powered on again for heating.

[0004] In the prior art, the heating power of the resistor wire of each signal is fixed. To change the heating power, the only way is to increase or decrease the working resistor wire. The adjustment span of this heating power is relatively large. The heating power of the resistor wire after being energized is fixed and cannot be adjusted. For a low-power oven, it takes a long time to reach the set heating temperature. For a high-power oven, when the set heating temperature is reached, the resistor wire is powered off and cooled. When it is lower than the set temperature, the resistor wire is powered on. Since the heating power of the resistor wire is large, the oven quickly reaches the set temperature. Therefore, during the entire heating process, the resistor wire will be frequently powered on and off, resulting in a large loss of heat energy. Summary of the invention

[0005] The object of the present invention is to provide a hot air circulation oven with adjustable circulating air heat.

[0006] In order to solve the above technical problems, the technical solution of a hot air circulation oven with adjustable circulating air heat in the present invention is as follows: A hot air circulation oven comprises a box body, in which a circulation fan, a temperature sensor and a resistance wire that generates heat when powered are arranged. The circulation fan comprises a vertically arranged fan barrel, and the circulation fan also comprises a fan impeller whose rotating axis is arranged inside the fan barrel and extends in the up-down direction. The fan barrel is a square barrel. A rotating bracket is rotatably mounted on the upper side of the fan barrel on the box body. The rotating bracket is driven by a first motor. The rotating bracket is coaxially arranged with the fan impeller. A heating resistance wire with a horizontally arranged axis is arranged on the rotating bracket. The axial length of the heating resistance wire is not less than the diagonal length of the fan barrel. During the rotation of the rotating bracket with the heating resistance wire, the length of the vertical projection of the heating resistance wire on the fan barrel changes.

[0007] Furthermore, the rotating bracket includes a first vertical arm and a second vertical arm symmetrically arranged with the rotating axis of the rotating bracket as the symmetry center line, one end of the heating resistance wire is fixed on the first vertical arm, and the other end of the heating resistance wire is fixed on the second vertical arm.

[0008] Furthermore, the rotating bracket also includes a vertically arranged bracket shaft, a horizontal connecting arm is arranged at the bottom of the bracket shaft, and a connecting arm ventilation hole is arranged on the horizontal connecting arm and penetrates the horizontal connecting arm in the up and down direction. The first vertical arm and the second vertical arm are fixed at both ends of the connecting arm.

[0009] Furthermore, a guide rod is fixed between the first vertical arm and the second vertical arm, and a first sliding head and a second sliding head are installed on the guide rod, which can move relative to each other or move back and forth. The upper end of the first sliding head is in contact with the heating resistance wire and is conductively connected. The upper end of the second sliding head is in contact with the heating resistance wire and is conductively connected. The first sliding head and the second sliding head are connected in series to the heating power supply circuit of the heating resistance wire, and the first sliding head and the second sliding head are driven by a sliding head driving mechanism.

[0010] Furthermore, the sliding head driving mechanism includes a fixed shaft fixed to the upper end of the fan barrel through a fixed shaft bracket, the fixed shaft is coaxially arranged with the fan impeller, the fixed shaft bracket is provided with a bracket ventilation channel extending in the up and down directions, a first steel wire rope connected to the first sliding head and a second steel wire rope connected to the second sliding head are wound around the upper end of the fixed shaft, and a sliding head return spring is arranged between the first sliding head and the second sliding head.

[0011] Furthermore, the inner cavity of the box is divided into a fan chamber and a baking chamber arranged on the left and right by a partition. The upper end of the partition is provided with a fan chamber air inlet connecting the fan chamber and the baking chamber, and the lower end of the partition is provided with a fan chamber air outlet connecting the fan chamber and the baking chamber. The circulating fan and the heating resistor are arranged in the fan chamber.

[0012] Furthermore, an equipment interlayer is provided at the upper end of the box body, a first motor is provided in the equipment interlayer, a second motor is also provided in the equipment interlayer, a baking rack shaft is rotatably installed in the baking chamber and the rotating axis extends in the up and down directions, the upper end of the baking rack shaft extends into the equipment interlayer and is transmission-connected to the second motor.

[0013] The beneficial effects of the present invention are as follows: in the present invention, the fan impeller rotates to generate an airflow from top to bottom in the inner cavity of the fan barrel, and the airflow velocity outside the cross-section of the fan barrel is relatively small. In the present invention, the heating resistor is rotated by rotating the bracket, thereby changing the amount of heat carried by the airflow; specifically, when the axial length direction of the heating resistor is consistent with the diagonal direction of the fan barrel, the vertical projection length of the heating resistor on the fan barrel is the longest, and at this time the airflow can carry more heat generated by the heating resistor for circulation; when the axial length of the heating resistor is consistent with the short side length of the fan barrel, the vertical projection length of the heating resistor on the fan barrel is the shortest, and the effective heat generated by the heating resistor outside the cross-section of the fan barrel cannot be carried away by the airflow, and at this time the airflow can carry less heat generated by the heating resistor for circulation, thereby achieving adjustment of the circulating air heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] By reading the following detailed description with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 yes Figure 1 A in the enlarged view; Figure 3 yes Figure 1 , a schematic diagram of the cooperation between the fixed shaft and the first sliding head and the second sliding head in the upward direction; Figure 4 This is a schematic diagram of the first state of the heating resistance wire and the fan cylinder in the present invention; Figure 5 This is a schematic diagram of the second state of the heating resistance wire and the fan cylinder in the present invention; Figure 6 It is a schematic diagram of the third state of the cooperation between the heating resistance wire and the fan cylinder in the present invention; 1. Support shaft; 2. Horizontal connecting arm; 3. First vertical arm; 4. Heating resistor wire; 5. First sliding head; 6. Fixed shaft support; 7. Fan cylinder; 8. Connecting arm ventilation hole; 9. Fan chamber air inlet; 10. Second vertical arm; 11. Partition; 12. Fixed shaft; 13. Fan impeller; 14. Support shaft; 15. First motor; 16. Second motor; 17. Baking rack shaft; 18. Equipment interlayer; 19. Fan chamber air outlet; 20. Box; 21. Baking rack; 22. Fan chamber; 23. Baking chamber; 24. Guide rod; 25. Second sliding head; 26. Reset spring; 27. First steel wire rope; 28. Second steel wire rope;. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0016] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0017] An embodiment of a hot air circulation oven of the present invention is as follows: Figures 1 to 6 As shown: The box body 20 includes a housing 20, the inner cavity of which is divided into a fan chamber 22 and a baking chamber 23 arranged on the left and right by a partition 11, the upper end of the partition is provided with a fan chamber air inlet 9, and the lower end of the partition is provided with a fan chamber air outlet 19. A temperature sensor and a baking rack 21 are arranged in the baking chamber 23, and a circulating fan and a heating resistor 4 are arranged in the fan chamber.

[0018] An equipment interlayer 18 is provided at the upper end of the box body, and the baking rack is arranged on the baking rack rotating shaft 17. The axis of the baking rack rotating shaft 17 is extended in the up and down directions. The upper and lower ends of the baking rack rotating shaft 17 are rotatably matched with the upper and lower ends of the baking chamber. The equipment interlayer 18 can be provided with a first motor 15 and a second motor 16. The upper end of the baking rack rotating shaft 17 extends into the equipment interlayer and is transmission connected to the second motor 16. Specifically, the upper end of the baking rack rotating shaft is transmission connected to the motor shaft of the second motor through a transmission chain.

[0019] The circulation fan includes a vertically arranged fan cylinder 7, the outer periphery of which is fixed to the inner wall of the fan chamber through a fan cylinder bracket, and the fan cylinder is a square cylinder. In this embodiment, the inner hole cross section of the fan cylinder is a rectangular structure, the long side length of the fan cylinder extends in the left-right direction, and the short side length of the fan cylinder extends in the front-back direction. The circulation fan also includes a fan impeller 13 arranged inside the fan cylinder, the rotation axis of which extends in the up-down direction, and when the fan impeller 13 rotates, a flow airflow from top to bottom is generated.

[0020] A rotating bracket is rotatably mounted on the upper side of the fan barrel on the box body, and the rotating bracket is driven by the first motor 15. The rotating axis of the rotating bracket is coaxially arranged with the rotating axis of the fan impeller. A heating resistance wire 4 with a horizontal axis is arranged on the rotating bracket. The axial length of the heating resistance wire 4 is not shorter than the diagonal length of the fan barrel. During the rotation of the rotating bracket with the heating resistance wire, the length of the vertical projection of the heating resistance wire on the cross-section of the inner cavity of the fan barrel changes.

[0021] In this embodiment, the rotating bracket includes a first vertical arm 3 and a second vertical arm 10 symmetrically arranged with the rotating axis of the rotating bracket as the symmetrical center line, one end of the heating resistance wire 4 is fixed to the first vertical arm 3, and the other end of the heating resistance wire 4 is fixed to the second vertical arm 10. The rotating bracket also includes a vertically arranged bracket shaft 1, a horizontal connecting arm 2 is arranged at the bottom of the bracket shaft, and a connecting arm ventilation hole 8 is arranged on the horizontal connecting arm 2 that penetrates the horizontal connecting arm in the up and down direction, and the first vertical arm 3 and the second vertical arm 10 are fixed to the two ends of the horizontal connecting arm 2. The upper end of the bracket shaft extends into the equipment interlayer and is drivingly connected to the motor shaft of the first motor.

[0022] Two guide rods 24 are fixed between the first vertical arm 3 and the second vertical arm 10, and the guide direction is consistent with the axial direction of the heating resistance wire. The first sliding head 5 and the second sliding head 25 that can move relative to each other or move back and forth are installed on the guide rod 24. The upper end of the first sliding head 5 is in contact with the heating resistance wire for conductive connection, and the upper end of the second sliding head 25 is in contact with the heating resistance wire for conductive connection. The first sliding head and the second sliding head are connected in series to the heating power supply circuit of the heating resistance wire, and the first sliding head and the second sliding head are driven by the sliding head driving mechanism. In other words, only the heating resistance wire between the first sliding head and the second sliding head will be energized and heated. When the first sliding head and the second sliding head move relative to each other, the length of the heating resistance wire between the first sliding head and the second sliding head becomes shorter, and the length of the heating resistance wire that can be energized and heated is shorter; when the first sliding head and the second sliding head move back and forth, the length of the heating resistance wire between the first sliding head and the second sliding head becomes longer, and the length of the heating resistance wire that can be energized and heated is longer, which can generate more heat.

[0023] The sliding head driving mechanism includes a fixed shaft 12 fixed to the upper end of the fan barrel through a fixed shaft bracket 6, and the fixed shaft bracket 6 includes four bracket rods arranged at intervals along the circumferential direction, wherein two bracket rods are fixedly connected to the inner wall of the long side of the fan barrel, and two bracket rods are fixedly connected to the inner wall of the short side of the fan barrel, and a bracket ventilation channel for airflow to pass from top to bottom is formed between two adjacent bracket rods. The fixed shaft 12 is coaxially arranged with the fan impeller 13, and the upper end of the fixed shaft is wound with a first steel wire rope 27 connected to the first sliding head 5 and a second steel wire rope 28 connected to the second sliding head 25, and the first steel wire rope 27 and the second steel wire rope 28 are arranged in sequence along the axial direction of the fixed shaft, and a reset spring 26 is arranged between the first sliding head and the second sliding head. When the first motor drives the rotating bracket to rotate in one direction, since the fixed shaft does not rotate, the first steel wire rope and the second steel wire rope will be wound around the fixed shaft, so that the first sliding head and the second sliding head can move relatively under the pulling action of the corresponding steel wire ropes, and the length of the heating resistor wire that can be powered on and generate heat becomes shorter; when the first motor drives the rotating bracket to rotate in another direction, the first steel wire rope and the second steel wire rope are loosened from the fixed shaft, and the first sliding head and the second sliding head move back and forth under the action of the reset spring, and the length of the heating resistor wire that can be powered on and generate heat becomes longer, which is similar to a sliding rheostat.

[0024] During use, the fan impeller rotates to generate airflow from top to bottom. The hot air flows through the fan chamber outlet into the baking chamber, and then flows back to the fan chamber through the fan chamber inlet, thus forming a cycle. When the heating energy needs to be changed, the first motor can rotate the rotating bracket, and the rotating bracket rotates the heating resistor wire, and the posture of the heating resistor wire changes. This change can be completed within 90° of the rotating bracket, which can achieve efficient changes in airflow heat, such as Figures 4 to 6 As shown, the projected length of the heating resistor wire on the cross section of the fan barrel changes, and the heat of the heating resistor wire outside the cross section of the inner cavity of the fan barrel cannot be effectively taken away by the airflow, so the heat in the airflow can be changed; of course, when the projected length of the heating resistor wire on the cross section of the fan barrel becomes shorter, the length of the heating resistor wire that can be powered on and heated in series on the heating power supply circuit will also become shorter, which can reduce energy consumption; if the rotating bracket continues to rotate in one direction, for example, the rotation angle exceeds 360°, the length of the heating resistor wire that can be powered on and heated in series on the heating power supply circuit will continue to shorten, and it can be shorter than the short side length of the fan barrel, or even shorter, which can provide a larger airflow heat change amplitude, so that the oven has a wider application environment. Of course, in other embodiments of the present invention, the first sliding head and the second sliding head can also be fixed heads whose spacing cannot be changed. At this time, the length of the heating resistor wire connected in series on the heating power supply circuit will not change, and the change of heat in the airflow is achieved only by changing the projected length of the heating resistor wire on the cross section of the fan barrel.

[0025] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0026] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0027] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hot air circulation oven, comprising a box body, in which a circulating fan, a temperature sensor and a resistance wire for generating heat when powered are arranged, characterized in that: The circulation fan includes a vertically arranged fan barrel, and the circulation fan also includes a fan impeller whose rotating axis is arranged on the inner side of the fan barrel and extends in the up-down direction. The fan barrel is a square barrel, and a rotating bracket is rotatably mounted on the upper side of the fan barrel on the box body. The rotating bracket is driven by a first motor, and the rotating bracket is coaxially arranged with the fan impeller. A heating resistance wire is arranged with a horizontal axis on the rotating bracket, and the axial length of the heating resistance wire is not less than the diagonal length of the fan barrel. During the rotation of the rotating bracket with the heating resistance wire, the length of the vertical projection of the heating resistance wire on the fan barrel changes.

2. The hot air circulation oven according to claim 1, characterized in that: The rotating bracket comprises a first vertical arm and a second vertical arm which are symmetrically arranged with the rotating axis of the rotating bracket as the symmetry center line. One end of the heating resistance wire is fixed on the first vertical arm, and the other end of the heating resistance wire is fixed on the second vertical arm.

3. The hot air circulation oven according to claim 1, characterized in that: The rotating bracket also includes a vertically arranged bracket shaft, a horizontal connecting arm is arranged at the bottom of the bracket shaft, and a connecting arm ventilation hole is arranged on the horizontal connecting arm which penetrates the horizontal connecting arm in the up and down direction. The first vertical arm and the second vertical arm are fixed at both ends of the connecting arm.

4. The hot air circulation oven according to claim 2, characterized in that: A guide rod is fixed between the first vertical arm and the second vertical arm, and the guide direction is consistent with the axial direction of the heating resistance wire. The guide rod is equipped with a first sliding head and a second sliding head that can move relative to each other or move back and forth. The upper end of the first sliding head is in contact with the heating resistance wire and is conductively connected. The upper end of the second sliding head is in contact with the heating resistance wire and is conductively connected. The first sliding head and the second sliding head are connected in series to the heating power supply circuit of the heating resistance wire, and the first sliding head and the second sliding head are driven by a sliding head driving mechanism.

5. The hot air circulation oven according to claim 4, characterized in that: The sliding head driving mechanism includes a fixed shaft fixed to the upper end of the fan barrel through a fixed shaft bracket, the fixed shaft is coaxially arranged with the fan impeller, and a bracket ventilation channel extending in the up and down directions is arranged on the fixed shaft bracket. A first steel wire rope connected to the first sliding head and a second steel wire rope connected to the second sliding head are wound around the upper end of the fixed shaft, and a sliding head return spring is arranged between the first sliding head and the second sliding head.

6. The hot air circulation oven according to any one of claims 1 to 5, characterized in that: The inner cavity of the box body is divided into a fan chamber and a baking chamber arranged on the left and right by a partition. The upper end of the partition is provided with a fan chamber air inlet connecting the fan chamber and the baking chamber, and the lower end of the partition is provided with a fan chamber air outlet connecting the fan chamber and the baking chamber. The circulating fan and the heating resistor are arranged in the fan chamber.

7. The hot air circulation oven according to claim 6, characterized in that: An equipment interlayer is arranged at the upper end of the box body, a first motor is arranged in the equipment interlayer, a second motor is also arranged in the equipment interlayer, a baking rack shaft is rotatably equipped in the baking chamber and a rotating axis extends in the up and down directions, an upper end of the baking rack shaft extends into the equipment interlayer and is transmission-connected to the second motor.

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