An air fryer

Abstract

The utility model discloses an air fryer, including the casing, the casing is formed with cooking cavity and electrical cavity in the partition and stop, still include: control module, it sets up in electrical cavity, flame detection module, it sets up in cooking cavity, and flame detection module is connected with control module communication, fan, it sets up in cooking cavity, and fan is connected with power through fan switch, and flame detection module sends the flame signal detected to control module, and the fan switch is controlled to open by control module. The utility model discloses an air fryer, through setting up flame detection module, is used for detecting the fire condition in cooking cavity, and sends the detection signal to control module, when the fire by control module control fan disconnects power, prevents oxygen from being inhaled further to expand the fire, and guarantees the safe use.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically, it relates to an air fryer. Background Technology

[0002] With the emergence of air fryers, a new type of kitchen appliance, more and more families are equipping themselves with this product. Air fryers generate high temperatures through electric heating elements, and then a fan blows hot air into the fryer to heat the food. While it brings convenience, it also easily leads to people neglecting safety issues. Air fryers generally use specially designed paper baking trays, but in actual use, people often cannot determine whether the tableware used for heating is heat-resistant, and it is almost inevitable that some users will use ordinary paper tableware. The ignition point of ordinary paper is only 130℃-255.5℃, while the maximum heating temperature of ordinary air fryers can reach 200-300℃, and in recent years there have been frequent safety accidents involving air fryer fires. Furthermore, even when using a special paper baking tray, there is still a risk of fire when heating for a prolonged period.

[0003] Therefore, it is essential to detect the open flame generated in an air fryer, which can not only protect the user's life and property, but also prevent the food inside from burning. Summary of the Invention

[0004] This invention addresses a series of safety issues arising from the use of paper baking trays in existing air fryers, which are prone to catching fire at high temperatures. It proposes an air fryer that can solve these problems.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0006] An air fryer includes a housing, wherein a cooking cavity and an electrical cavity are formed within the housing by a partition, and further includes:

[0007] The control module is disposed in the electrical cavity;

[0008] A flame detection module is disposed in the cooking cavity, and the flame detection module is communicatively connected to the control module.

[0009] A fan is installed in the cooking cavity. The fan is connected to a power source via a fan switch. The flame detection module sends the detected flame signal to the control module, which then controls the fan switch to turn off.

[0010] In some embodiments, the air fryer includes a frying basket, and a mounting port communicating with the cooking cavity is provided on one side of the shell. The frying basket is removably mounted in the cooking cavity through the mounting port. The flame detection module is located above the frying basket, and the detection direction of the flame detection module is tilted towards the frying basket.

[0011] In some embodiments, the flame detection module is disposed on the inner side wall of the housing and is located on the same side as the mounting port.

[0012] In some embodiments, the detection field of view of the flame detection module is 60° to 90°.

[0013] In some embodiments, a heat insulation layer is provided between the cooking cavity and the electrical cavity.

[0014] In some embodiments, the air fryer further includes an electric heating element located below the fan, with the fan's airflow direction directed towards the electric heating element.

[0015] In some embodiments, the flame detection module is located on one side of the electric heating tube, and a heat insulation cover is provided on the outside of the flame detection module.

[0016] In some embodiments, the flame detection module includes:

[0017] Flame detection sensor;

[0018] An RC filter circuit is connected to the output terminal of the flame detection sensor and is used to filter the flame detection signal and output a filtered signal.

[0019] An operational amplifier circuit, connected to the output of the RC filter circuit, is used to amplify the filtered signal and output it to the control module.

[0020] In some embodiments, the heat insulation cover has a light-transmitting hole, the flame detection sensor is positioned facing the light-transmitting hole, and the flame detection module further includes:

[0021] A narrowband filter on a silicon substrate is disposed in the light-passing hole.

[0022] In some embodiments, the air fryer also includes a buzzer connected to the control module.

[0023] Compared with the prior art, the advantages and positive effects of this utility model are:

[0024] This invention relates to an air fryer that incorporates a flame detection module to detect any fire in the cooking chamber and sends the detection signal to a control module. In the event of a fire, the control module controls the fan to disconnect from the power supply, preventing oxygen from being drawn in and further intensifying the fire, thus ensuring safe use.

[0025] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of one embodiment of the air fryer proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the field of view of the flame detection module in one embodiment of the air fryer proposed in this utility model;

[0029] Figure 3 This is a schematic diagram of the flame detection module in one embodiment of the air fryer proposed in this utility model;

[0030] Figure 4 This is a circuit diagram of the flame detection module in one embodiment of the air fryer proposed in this utility model;

[0031] In the diagram, 11 is the outer shell; 111 is the cooking cavity; 112 is the electrical cavity; 113 is the heat insulation layer; 114 is the air outlet; 12 is the control module; 13 is the flame detection module; 131 is the cover; 132 is the silicon substrate narrowband filter; 14 is the fan; 15 is the electric heating element; 16 is the fryer basket; and 17 is the control panel. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0036] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] Example 1: This example proposes an air fryer, such as... Figure 1 As shown, the air fryer includes a housing 11, within which a cooking chamber 111 and an electrical chamber 112 are formed by partitions. The air fryer also includes a control module 12, a flame detection module 13, a fan 14, and an electric heating element 15. The control module 13 controls the operation of the fan 14. When the fan 14 is turned on, it blows the heat generated by the electric heating element 15 onto the food to be heated, and draws in fresh air from outside the housing 11 through airflow circulation, expelling exhaust gases generated during food heating. The air fryer does not produce an open flame during normal operation. To prevent accidents, the flame detection module 13 detects whether there is an open flame inside the cooking chamber 111 and sends a detection signal to the control module 13. When an open flame is detected, the control module 13 can control the fan 14 to stop working, preventing further spread of the fire due to continued intake of oxygen from the outside.

[0038] In some embodiments, the control module 12 is located in the electrical cavity 112. When heating food, the food is placed in the cooking cavity 111. The heat generated by the electric heating element 15 will cause the temperature in the cooking cavity 111 to be high. By isolating the cooking cavity 111 from the electrical cavity 112, the heat in the cooking cavity 111 can be prevented from being transferred to the electrical cavity 112, thereby protecting the electronic components such as the control module 12 located in the electrical cavity 112.

[0039] In some embodiments, a heat insulation layer 113 is provided between the cooking cavity 111 and the electrical cavity 112, which can further block the heat transfer between the cooking cavity 111 and the electrical cavity 112.

[0040] The control module 12 can also be equipped with other protective measures such as a high-temperature resistant material coating on its outer side.

[0041] The flame detection module 13 is installed in the cooking cavity 111 and is communicatively connected to the control module 12. The flame detection module 13 is used to send the detected flame signal to the control module 12.

[0042] The electric heating element 15 and the fan 14 are installed in the cooking cavity 111. The fan 14 is connected to the power supply through a fan switch. The flame detection module 13 sends the detected flame signal to the control module 12, which controls the fan switch to turn off.

[0043] The air fryer includes a frying basket 16. A mounting port communicating with a cooking chamber 111 is provided on one side of the housing 11. The frying basket 16 is removably mounted into the cooking chamber 111 through the mounting port. Open flames in the air fryer are generally caused by the ignition of a paper baking tray. Therefore, the initial ignition point should be in the frying basket 16. To detect the fire promptly, in some embodiments, a flame detection module 13 is located above the frying basket 16, and the detection direction of the flame detection module 13 is tilted towards the frying basket 16. The flame detection module 13, through its top-down detection angle, can essentially cover the entire frying basket 16, thus enabling early detection of the fire and allowing for timely intervention to minimize damage.

[0044] In some embodiments, such as Figure 2 As shown, the detection field of view of the flame detection module is 60° to 90°, which can cover most of the fryer basket 16 and the bottom of the entire fryer basket 16.

[0045] In some embodiments, the air fryer also includes a buzzer connected to the control module 12. If an open flame is generated inside the fryer basket 16, the wavelength of the heat radiation detected by the flame detection module 13 will become significantly smaller. The system determines that an open flame has been generated inside the fryer by judging that the voltage pattern returned by the flame detection module 13 continuously exceeds a preset threshold (T2), and immediately shuts off the power to the fan 14 to prevent oxygen from being drawn in and further expanding the fire. At the same time, the buzzer alarm is activated.

[0046] In some embodiments, the air fryer also includes an indicator light connected to the control module 12. When an open flame is detected, in addition to turning off the power to the fan 14 and turning on the buzzer, the flame detection module 13 continuously monitors the heat radiation intensity. If the fire intensifies, the indicator light illuminates, prompting the user to open the lid to check if there is still an open flame. If the fire intensifies after turning off the fan 14 or if it does not intensify, the buzzer sounds rapidly, warning the user that there is a risk of upward flame explosion if the air fryer is removed. All alarms remain in effect until the power is cut off.

[0047] An operation panel 17 is provided above the mounting port. The operation panel 17 is equipped with a touch panel or knob and other command input modules. In order to facilitate the introduction of the communication line of the flame detection module 13 into the electrical cavity 112 and the connection with the control module 12, in some embodiments, the flame detection module 13 is set on the inner side wall of the housing 11 and is located on the same side as the mounting port.

[0048] In some embodiments, the flame detection module 13 is located above the mounting port, that is, the flame detection module 13 is closest to the operation panel 17, which makes it convenient for the communication lines of the flame detection module 13 and the operation panel 17 to be routed together.

[0049] In some embodiments, the air fryer also includes an electric heating element 15, which is located below the fan 14, and the airflow direction of the fan 14 is towards the electric heating element 15. When the air fryer is working, the fan 14 blows air towards the electric heating element 15, which drives the hot air around the electric heating element 15 to blow towards the fryer basket 16 to heat the food in the fryer basket 16.

[0050] An air outlet 114 is provided at the rear of the housing 11, and a heat dissipation vent is provided at the bottom of the housing 11. The control module 12 determines the power on / off operation based on the delay knob on the operation panel, calculates and adjusts the output power of the electric heating tube through the temperature adjustment knob, and the fan 14 turns on before the electric heating tube 15. After the electric heating tube 15 turns on, it heats the surrounding air. Under the action of the fan 14, high-temperature gas is output to the fryer basket 16 to bake the food, and the exhaust gas is discharged to the air outlet 114 located at the rear of the housing 11.

[0051] In some embodiments, the blades of the fan 14 are metal blades, and the air fryer also includes a temperature sensor installed at the bottom of the insulation layer 113 in close contact with the metal fan to detect the temperature in the cooking cavity 111.

[0052] In some embodiments, such as Figure 1 , Figure 3 As shown, the flame detection module 13 is located on one side of the electric heating tube 15, and a heat insulation cover 131 is provided on the outside of the flame detection module 13. The heat insulation cover 131 serves to protect the circuit of the flame detection module 13.

[0053] Different combustibles produce thermal radiation of varying intensities, which manifests in differences in radiation wavelength and flame color. Shorter wavelengths result in greater radiation intensity, higher combustion temperatures, and bluer flames. The flame detection module 13 in this embodiment can detect infrared light with wavelengths in the range of 700 nm to 1000 nm. The longer the wavelength of red light, the smaller the current change generated by the flame detection sensor due to the pyroelectric effect of the material; the flame detection module 13 operates based on this characteristic. Common paper combustion produces red flames with thermal radiation wavelengths in the range of 620 nm to 700 nm, and a flame center temperature of 600 to 700°C. Electric heating elements, when heating food, do not exceed 300°C, producing thermal radiation significantly different from that of an open flame. This difference allows for a clear distinction between normal heating and open flame conditions within the pot.

[0054] In some embodiments, the heat insulation cover 131 has a light-transmitting hole, and the flame detection sensor is positioned facing the light-transmitting hole. The flame detection module also includes a silicon substrate narrowband filter 132, which is disposed in the light-transmitting hole. The silicon substrate narrowband filter 132 is used to filter out light signals in the interference band, prevent false judgments, and improve the accuracy of flame detection.

[0055] The flame detection sensor of the flame detection module 13 is based on the pyroelectric effect of lithium monocrystalline lithium oxide. Combined with an ultra-low noise field-effect transistor and a silicon substrate narrowband filter 132, it can ensure high responsivity and low noise of the detector.

[0056] In some embodiments, the flame detection module 13 includes a flame detection sensor, an RC filter circuit, and an operational amplifier circuit. The RC filter circuit is connected to the output terminal of the flame detection sensor and is used to filter the flame detection signal and output a filtered signal.

[0057] The operational amplifier circuit is connected to the output of the RC filter circuit to amplify the filtered signal and output it to the control module.

[0058] In some embodiments, such as Figure 4 As shown, the flame detection sensor may employ, but is not limited to, a field-effect transistor, a photoresistor XT1, and a resistor R2.

[0059] An RC filter circuit can use, but is not limited to, a third resistor R2 and a filter capacitor C4.

[0060] The operational amplifier circuit may include operational amplifier chip U1A.

[0061] A flame detection sensor, in conjunction with an operational amplifier circuit and an RC filter circuit, converts changes in the intensity of external infrared radiation into a voltage signal. The microcontroller then uses an A / D converter to acquire and convert the magnitude of the thermal radiation into a value ranging from 0 to 255. The stronger the flame radiation, the lower the value; the weaker the flame radiation, the higher the value. By comparing this value with a preset threshold, the system indicates whether there is an open flame inside the pot.

[0062] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. An air fryer, comprising a shell, wherein a cooking cavity and an electrical cavity are formed within the shell by a partition, characterized in that, Also includes: The control module is disposed in the electrical cavity; A flame detection module is disposed in the cooking cavity, and the flame detection module is communicatively connected to the control module. A fan is installed in the cooking cavity. The fan is connected to a power source via a fan switch. The flame detection module sends the detected flame signal to the control module, which then controls the fan switch to turn off.

2. The air fryer according to claim 1, characterized in that, The air fryer includes a frying basket. A mounting port communicating with the cooking cavity is provided on one side of the shell. The frying basket is detachably mounted in the cooking cavity through the mounting port. The flame detection module is located above the frying basket, and the detection direction of the flame detection module is tilted towards the frying basket.

3. The air fryer according to claim 2, characterized in that, The flame detection module is disposed on the inner wall of the housing and is located on the same side as the mounting port.

4. The air fryer according to claim 3, characterized in that, The detection field of view of the flame detection module is 60° to 90°.

5. The air fryer according to claim 2, characterized in that, A heat insulation layer is provided between the cooking cavity and the electrical cavity.

6. The air fryer according to claim 2, characterized in that, The air fryer also includes an electric heating element, which is located below the fan and the fan's airflow direction is towards the electric heating element.

7. The air fryer according to claim 6, characterized in that, The flame detection module is located on one side of the electric heating tube, and a heat insulation cover is provided on the outside of the flame detection module.

8. The air fryer according to claim 7, characterized in that, The flame detection module includes: Flame detection sensor; An RC filter circuit is connected to the output terminal of the flame detection sensor and is used to filter the flame detection signal and output a filtered signal. An operational amplifier circuit, connected to the output of the RC filter circuit, is used to amplify the filtered signal and output it to the control module.

9. The air fryer according to claim 8, characterized in that, The heat insulation cover has a light-transmitting hole, and the flame detection sensor is positioned facing the light-transmitting hole. The flame detection module also includes: A narrowband filter on a silicon substrate is disposed in the light-passing hole.

10. The air fryer according to any one of claims 1-9, characterized in that, The air fryer also includes a buzzer, which is connected to the control module.

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