CN215605083U

CN215605083U - Air frying equipment

Info

Publication number: CN215605083U
Application number: CN202120968924.6U
Authority: CN
Inventors: 何爱民; 张相和
Original assignee: Shenzhen Hesheng Innovation Technology Co ltd
Current assignee: Shenzhen Hesheng Innovation Technology Co ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-01-25
Anticipated expiration: 2031-05-07

Abstract

An air frying device comprises an air frying pan and a stepless speed control system, and is used for carrying out air frying treatment on articles to be fried by utilizing air. This air fryer includes: the frying device comprises an air frying cavity for accommodating the articles to be fried, an air circulating device arranged in the air frying cavity and an air heating device arranged in the air frying cavity. The stepless speed control system is configured to the air fryer and comprises: a signal modulation module for modulating parameters of a stepless control signal according to the working stage of the air fryer; and a power regulating module for steplessly regulating the driving power of the air circulating device in response to the modulated stepless control signal so as to control the flow speed of the air in the air frying cavity.

Description

Air frying equipment

Technical Field

The utility model relates to the technical field of air frying, in particular to air frying equipment.

Background

An air fryer as a machine capable of using hot air to "fry" is mainly to use hot air to replace the hot oil in the original fryer to heat the objects (such as food like chips, vegetables, meat or fish, etc.), and to take away the moisture on the surface of the objects by the hot air to achieve the frying effect. Air fryers are receiving increasing attention and preference from users because they not only substantially eliminate fat from the item, but also maintain many of the desired qualities of the fried item (e.g., the appearance and texture of the fried food, etc.), and are of great commercial value.

Conventional air fryers typically include a housing, an electric heater and a fan disposed within the housing, a fry basket positionable within the housing, and a controller for controlling the electric heater and the fan. The controller is controllable to turn on the electric heater for heating air within the enclosure to form hot air when the fry basket containing items to be fried is placed within the enclosure; and the controller is capable of controlling to turn on the fan for blowing the hot air to circulate within the fry basket for air-frying the articles to be fried.

In the actual use of the conventional air fryer, first, when the conventional air fryer is turned on, the controller will control the electric heater to start operating to release heat to heat the air, and at the same time, the controller will control the fan motor to start to blow the air, so that the temperature of the air in the casing is gradually increased. Then, when the air temperature in the housing approaches the upper limit of the target temperature, the controller will control the electric heater to stop operating. At this time, a part of the heat in the casing is absorbed by the articles to be fried, and another part of the heat in the casing is rapidly dissipated due to the fan action of the fan, so that the temperature of the air in the casing is rapidly reduced. Then, when the air temperature in the housing drops to a lower limit close to the target temperature, the controller controls the electric heater to start operating again to heat the air again, and the control is repeated so that the air temperature in the housing fluctuates around the target temperature. Finally, after the existing air fryer is started for a period of time, the controller controls the electric heater and the fan to stop running so as to finish the air frying process.

However, the heating characteristic of the electric heater is limited, and the fan is operated at full speed at the same rotation speed during the whole air frying process, so that it takes a long time to heat the air temperature in the casing to the target temperature after the conventional air fryer is started, which results in poor air frying efficiency and quality of the conventional air fryer, and even seriously affects the air frying effect of the fried object. At the same time, after the air in the casing is heated to near the target temperature, the conventional air fryer loses a large amount of heat because the fan is still running at full speed, so that the electric heater has to be frequently turned on to supplement the heat, which not only wastes a large amount of heat, but also increases the fluctuation range of the air temperature in the casing, and influences the air frying effect of the fried food, such as the appearance and taste of the fried food.

In addition, because the surface water content and the grease content of different food materials (such as chips, chicken, steak, pork chop or fish and shrimp) are different, the dehydration amount and the degreasing amount required in the air frying process are also different, and the air flow rate in the shell directly determines the surface dehydration and degreasing speed of the food materials, when the existing air fryer is used for air frying different food materials, the food materials with low surface water content or fat content are hard and even astringent due to the fact that the dehydration amount or the degreasing amount is too large, and the food materials with high surface water content or fat content are soft and damp due to the fact that the dehydration amount or the degreasing amount is too small, so that a good air frying effect cannot be achieved, and the mouth feelings of the different food materials after air frying through the existing air fryer are different.

SUMMERY OF THE UTILITY MODEL

An advantage of the present invention is to provide an air fryer having a controlled air flow rate that facilitates improved air frying performance.

Another advantage of the present invention is to provide an air-frying apparatus, wherein, in an embodiment of the present invention, the air-frying apparatus can select the air flow speed in the air-frying pan according to the material of the object to be fried, so as to reasonably control the dehydration effect and the degreasing effect of the object to be fried, thereby improving the air-frying effect of the object to be fried.

Another advantage of the present invention is to provide an air-frying apparatus, wherein in an embodiment of the present invention, the air-frying apparatus can select different air flow speeds according to different food materials, so that the dehydration effect and the degreasing effect are matched with the corresponding food materials, thereby better improving the air-frying effect and the mouthfeel.

It is a further advantage of the present invention to provide an air fryer apparatus wherein, in one embodiment of the present invention, the air fryer apparatus is capable of adjusting the air flow rate within the air fryer in response to different stages of the air frying process to control the temperature of the air within the air fryer to enhance the air frying effect.

It is another advantage of the present invention to provide an air fryer apparatus, wherein, in one embodiment of the present invention, the air fryer apparatus is capable of controlling the drive power of the air circulation device of the air fryer via a pulse wave to steplessly control the air flow rate within the air fryer.

Another advantage of the present invention is to provide an air-frying apparatus, wherein in an embodiment of the present invention, the air-frying apparatus can control the fan of the air circulation device to frequently switch between a high speed operation state and a low speed operation state through the high level and the low level of the pulse wave, thereby precisely controlling the driving power of the air circulation device.

It is another advantage of the present invention to provide an air fryer apparatus, wherein, in an embodiment of the present invention, the air fryer apparatus is capable of continuously adjusting the driving power of the air circulation device by modulating the duty cycle of the pulse wave so as to steplessly adjust the air flow rate within the air fryer.

Another advantage of the present invention is to provide an air-frying apparatus, wherein, in an embodiment of the present invention, the air-frying apparatus can change the power frequency by modulating the frequency of the pulse wave to continuously adjust the rotation speed of the fan, so as to achieve the desired stepless speed-adjusting effect.

Another advantage of the present invention is to provide an air-frying apparatus, wherein, in one embodiment of the present invention, the air-frying apparatus can provide a dry low temperature environment for the motor of the fan, which helps to prolong the useful life of the fan.

It is a further object of the present invention to provide an air-frying apparatus in which no complex structure or algorithm is required in the present invention in order to achieve the above objects. The present invention therefore successfully and effectively provides a solution that not only provides a simple air-frying apparatus, but also increases the practicality and reliability of the air-frying apparatus.

To achieve at least the above and other objects and advantages in accordance with the purpose of the utility model, an air-fry apparatus for air-frying an article to be fried with air, wherein the air-fry apparatus comprises:

an air fryer, wherein said air fryer comprises:

an air-frying chamber for receiving the articles to be fried;

an air circulation device, wherein the air circulation device is arranged in the air frying cavity and is used for driving the air to circularly flow in the air frying cavity; and

an air heating device, wherein said air heating device is disposed in said air frying chamber for heating the air flowing in said air frying chamber; and

a stepless speed control system, wherein said stepless speed control system is configured to said air fryer pot, and said stepless speed control system comprises, communicatively connected to each other:

the signal modulation module is used for modulating parameters of a stepless control signal according to the working stage of the air fryer; and

a power regulating module for steplessly regulating the driving power of the air circulating device in response to the steplessly controlled signal after being modulated so as to control the flow speed of the air in the air frying cavity.

According to an embodiment of the application, the air-frying chamber comprises a housing defining an interior chamber and an air-frying member, wherein the air-frying member is disposed in the housing and the air-frying member is adapted to retain the item to be fried in the interior chamber.

According to an embodiment of the present application, the air circulation device comprises a power supply circuit for communicating with a power source, a fan disposed in the power supply circuit, and a rotational speed adjustment device disposed in the power supply circuit, wherein the rotational speed adjustment device is configured to instantaneously switch a real-time motor rotational speed of the fan based on the stepless control signal to achieve stepless adjustment of the driving power of the air circulation device.

According to an embodiment of the application, the stepless control signal is a pulse wave and the parameter of the stepless control signal comprises a duty cycle of the pulse wave, wherein said rotation speed regulating means of said air circulation device is implemented as a switching means.

According to an embodiment of the application, the power regulating module is further configured to: responding to the high level of the pulse wave, immediately conducting the power supply circuit through the switching device, so that the current working voltage of the fan is equal to the real-time voltage applied to the fan through the power supply circuit, and the fan is in a high-rotating-speed running state; and responding to the low level of the pulse wave, immediately disconnecting the power supply circuit through the switching device, so that the current working voltage of the fan is equal to zero, and the fan is in a low-speed running state.

According to an embodiment of the present application, the signal modulation module includes a duty cycle adjustment module, wherein the duty cycle adjustment module is configured to: in response to the air fryer being in a preheating stage, adjusting the duty ratio of the pulse wave to 0 so that the driving power of the air circulation device is adjusted to zero power; in response to the air fryer being in a primary heating stage, increasing the duty cycle of the pulse wave such that the driving power of the air circulation device is steplessly increased; modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device in response to the air fryer being in a constant temperature heating phase; and adjusting the duty ratio of the pulse wave to 1 in response to the air fryer being in a cooling phase, such that the driving power of the air circulation device is adjusted to full power.

According to an embodiment of the present application, said signal modulation module further comprises a temperature analysis module communicatively connected to said duty cycle adjustment module, wherein said temperature analysis module is configured to analyze the temperature of the air flowing within the air fryer cavity detected in real time in response to the air fryer being in the constant temperature heating phase to obtain a temperature change of the air flowing within the air fryer cavity; wherein the duty ratio adjusting module is further configured to increase the duty ratio of the pulse ratio in response to a current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, such that the driving power of the air circulation device is steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper and lower limits of the preset target temperature, decreasing the duty cycle of the pulse ratio such that the driving power of the air circulation device is steplessly decreased to maintain the temperature of the air within the air cavity between the upper and lower limits of the preset target temperature.

According to an embodiment of the present application, the air fryer further comprises a temperature sensor, wherein the temperature sensor is disposed within the air fryer cavity, and the temperature sensor is communicatively connected to the temperature analysis module of the stepless speed control system for detecting the temperature of the air flowing within the air fryer cavity in real time and transmitting the detected temperature data to the temperature analysis module.

According to an embodiment of the application, the switching device is a solid state relay.

According to an embodiment of the application, the stepless control signal is a pulse wave and the parameter of the stepless control signal comprises the frequency of the pulse wave, wherein the rotational speed adjusting means of the air circulation device is implemented as a frequency conversion means.

According to an embodiment of the application, the power regulating module is further configured to instantaneously regulate, by the frequency conversion device, a frequency of the power supplied to the fan via the power supply circuit in response to the frequency of the pulse wave to steplessly regulate a motor speed of the fan, such that the driving power of the air circulation device is steplessly regulated.

According to an embodiment of the present application, the signal modulation module comprises a frequency adjustment module, wherein the frequency adjustment module is configured to adjust the frequency of the pulse wave to 0 in response to the air fryer being in a preheating phase, such that the fan of the air circulation device stops rotating; in response to the air fryer being in a primary heating stage, increasing the frequency of the pulse wave such that the motor speed of the fan is steplessly increased; modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan in response to the air fryer being in a constant temperature heating phase; and adjusting the frequency of the pulse wave to a rated frequency in response to the air fryer being in a cooling stage, so that the motor speed of the fan is adjusted to a full speed.

According to another aspect of the present application, an embodiment of the present application further provides an air-frying apparatus for air-frying an article to be fried with air, wherein the air-frying apparatus includes:

an air fryer, wherein said air fryer comprises:

an air-frying chamber for receiving the articles to be fried;

a control system for an air fryer, wherein the control system for an air fryer is configured with the air fryer, and the control system for an air fryer comprises communicatively interconnected:

the driving control module is used for controlling the air circulating device so as to drive the air to flow in the air frying cavity;

a heating control module for controlling said air heating means to heat the air flowing within said air fryer cavity; and

and the flow rate regulating module is used for selectively regulating and controlling the flow speed of the air in the air frying cavity according to the material of the to-be-fried object contained in the air frying cavity, so that the flow speed of the air is matched with the to-be-fried object.

Further objects and advantages of the utility model will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

FIG. 1 is a flow chart diagram of a control method for an air fryer in accordance with an embodiment of the present invention.

FIG. 2 is a flow chart showing the flow rate adjusting step in the control method for an air fryer according to the above embodiment of the present invention

Fig. 3 is a flow chart of a method of stepless speed control according to an embodiment of the present invention.

Fig. 4 shows an example of the stepless control signal in the stepless speed control method according to the above-described embodiment of the present invention.

Fig. 5 shows a flow chart of the power regulation step in the stepless speed control method according to the above embodiment of the present invention.

Fig. 6 is a schematic view showing the operation principle of the air fryer in the stepless speed control method according to the above embodiment of the utility model.

Fig. 7 shows a schematic diagram of the duty ratio variation in the stepless speed control method according to the above embodiment of the present invention.

Fig. 8 is a schematic flow chart illustrating a signal modulation step in the stepless speed control method according to the above embodiment of the present invention.

Fig. 9 shows a first example of the duty cycle modulation step in the stepless speed control method according to the above-mentioned embodiment of the present invention.

Fig. 10 shows a second example of the duty cycle modulation step in the stepless speed control method according to the above-described embodiment of the present invention.

Fig. 11 shows a variant implementation of the method of stepless speed control according to the above-described embodiment of the utility model.

Fig. 12 shows a flow chart of the power regulation step in the stepless speed control method according to the above-described variant embodiment of the present invention.

Fig. 13 shows a schematic flow chart of the signal modulation step in the stepless speed control method according to the above variant embodiment of the present invention.

FIG. 14 is a block diagram schematic of a control system for an air fryer in accordance with an embodiment of the present invention.

FIG. 15 is a block diagram schematic of a stepless speed control system according to an embodiment of the present invention.

Fig. 16 shows a modified implementation of the stepless speed control system according to the above embodiment of the utility model.

FIG. 17 shows a block diagram schematic of an electronic device according to an embodiment of the utility model.

Fig. 18 is a block diagram schematic of an air-fryer apparatus according to an embodiment of the utility model.

Fig. 19 shows a schematic perspective view of the air-frying apparatus according to the above-described embodiment of the present invention.

Fig. 20 shows a schematic cross-sectional view of the air-frying apparatus according to the above-described embodiment of the present invention.

Fig. 21 shows an exploded view of the air-fryer apparatus according to the above-described embodiment of the present invention.

Detailed Description

The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless the number of such elements is explicitly recited as one in the present disclosure, but rather the terms "a" and "an" should not be construed as being limited to only one of the number.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Currently, existing air fryers typically utilize switches, such as mechanical relays or the like, to control the operation of the fan in open and closed circuits such that the fan only operates at full speed and stops. Thus, when the conventional air fryer is initially started to operate in the pre-heat stage, the fan is operated at full speed to fan the air in the air fryer at a rapid rate, which results in a long time required for the air in the conventional air fryer to be heated to the target temperature, resulting in poor air frying efficiency and quality of the conventional air fryer, and even a serious impact on the air frying performance of the articles to be fried. When the conventional air fryer is in a constant temperature heating stage (i.e., the air inside the housing is heated to near the target temperature), the fan is still operating at full speed, so that the conventional air fryer loses a large amount of heat, causing the electric heater of the conventional air fryer to have to be frequently turned on to supplement the heat, not only causing a large amount of heat to be wasted, but also increasing the fluctuation range of the air temperature inside the housing, and affecting the air frying effect of the articles to be fried, such as the appearance and taste of the fried food.

In addition, because the fans of the existing air fryer are all operated at full speed in the process of air-frying different food materials, the flowing speed of the air in the existing air fryer is kept to be maximum, the dehydration effect and the degreasing effect of the existing air fryer are in the maximum state, which is disastrous to the food materials with small water content and fat content, the cooked food materials are easy to dry and hard, even dry and astringent, and the cooking effect and the taste of the food materials are seriously influenced.

In fact, in order to obtain an excellent air frying effect, the air temperature in the air fryer needs to be both rapidly heated to a target temperature and kept as constant as possible at the target temperature, and it is further necessary to select different air speeds depending on the material (e.g., water content and/or fat content) of the articles to be fried so that the dehydrating effect and the degreasing effect match the material of the articles to be fried. In order to achieve the effect, the utility model provides a control method and a stepless speed control method for an air fryer, a system and equipment thereof, which can select the flow speed of air in the air fryer according to the material of the to-be-fried object so as to reasonably control the dehydration effect and the degreasing effect of the to-be-fried object, thereby improving the air frying effect of the to-be-fried object. It is understood that the frying object mentioned in the present invention may be food such as potato chips, vegetables, meat or fish, etc., or non-edible industrial goods, etc., and the present invention is not limited thereto.

Illustrative method

Referring to fig. 1 to 10 of the drawings, a control method for an air fryer according to an embodiment of the present invention is illustrated, wherein the control method is applied to an air fryer 1, and the air fryer 1 may generally include an air frying chamber 10 for containing an article to be fried, an air circulating means 20 for driving air to circulate in the air frying chamber 10, and an air heating means 30 for heating the air flowing in the air frying chamber 10. Thus, after the air-frying chamber 10 is filled with the articles to be fried, the air heated by the air heating device 30 will contact the articles to be fried under the driving of the air circulation device 20, so as to complete the air-frying process of the articles to be fried.

It is to be understood that although the advantages and features of the control method for an air fryer of the present invention are illustrated by way of example in the air fryer 1 shown in fig. 1-10, the specific configuration of the air fryer 1 is exemplary only and does not constitute a limitation on the control method for an air fryer of the present invention. For example, in other examples of the present invention, the specific structure of the air fryer 1 may also be implemented as other types of structures as long as the desired air frying effect can be achieved.

Specifically, according to the above-described embodiment of the present application, as shown in fig. 1, the control method for an air fryer may include the steps of:

a: controlling an air circulation device 20 of an air fryer 1 to drive air to flow in an air frying chamber 10 of said air fryer 1;

b: controlling an air heating means 30 of said air fryer 1 to heat said air flowing in said air-frying chamber 10; and

c: according to the material of the articles to be fried contained in the air frying cavity 10, the flow speed of the air in the air frying cavity 10 is selectively regulated, so that the flow speed of the air is matched with the material of the articles to be fried.

It should be noted that, since the control method for an air fryer of the present application can selectively control the flow rate of the air in the air frying chamber 10, which in turn directly determines the dehydration effect and/or the degreasing effect of the fried product during the air frying process, the control method for an air fryer of the present application can match the flow rate of the air with the material (such as the moisture content and/or fat content) of the fried product. For example, when the water content or fat content of the to-be-fried item is high, the control method for the air fryer of the present application selects to increase the flow speed of the air to increase the dehydration efficiency or degreasing efficiency of the air fryer 1 on the to-be-fried item, thereby obtaining an excellent air frying effect; when the water content or fat content of the fried articles is low, the control method for the air fryer of the application adjusts the flow speed of the air to be low, so as to reduce the dehydration efficiency or degreasing efficiency of the air fryer 1 on the fried articles, and still obtain excellent air frying effect.

Further, the driving power of the air circulation device 20 is positively correlated with the flow speed of the air driven by the air circulation device 20, that is, the larger the driving power of the air circulation device 20 is, the larger the flow speed of the air driven by the air circulation device 20 is, and the larger the flow speed of the air in the air frying chamber 10 is; and vice versa.

Preferably, in the step C of the control method for an air fryer: the operating threshold of the driving power of the air circulation device 20 is selectively controlled according to the moisture content and/or fat content of the fried goods, so that the maximum flow speed of the air in the air frying cavity 10 is positively correlated with the moisture content and/or fat content of the fried goods.

It is to be understood that the maximum flow rate mentioned in the present application is not the rate at which the air circulation device 20 of the air fryer 1 is in the full power operation to drive the air to flow in the air frying chamber 10, but the control method for the air fryer of the present application is the maximum value of the air flow rate regulated according to the material of the articles to be fried, that is, the maximum flow rate is different for the articles to be fried of different materials.

For example, for food materials such as french fries having a low moisture content or fat content, the control method for an air fryer of the present application can adjust the operating threshold of the driving power of the air circulation device 20 to reduce the maximum flow velocity of the air within the air frying chamber 10 to prevent excessive air flow velocity from causing excessive dehydration or defatting of the food material; for food materials such as meat with high water content or fat content, the control method for the air fryer can adjust the operating threshold of the driving power of the air circulation device 20 to increase the maximum flow speed of the air in the air frying cavity 10, so as to prevent the food materials from being dehydrated or defatted insufficiently due to too small air flow speed to affect the taste.

It should be noted that, in an example of the present application, the control method for an air fryer according to the present application may manually set the operation threshold of the driving power of the air circulation device 20 through a manner such as an interactive interface or a button according to the material of the articles to be fried, that is, the control method for an air fryer according to the present application may manually regulate the maximum flow speed of the air in the air frying chamber 10 according to the material of the articles to be fried.

Of course, in other examples of the present application, the control method for an air fryer according to the present application may also intelligently select the operation threshold of the driving power of the air circulation device 20 according to the material of the articles to be fried through pre-stored data, that is, the control method for an air fryer according to the present application may intelligently regulate the maximum flow speed of the air in the air frying chamber 10 according to the material of the articles to be fried.

More specifically, according to the above-mentioned embodiment of the present application, as shown in fig. 2, the step C of the control method for an air fryer may include the steps of:

c1: identifying the material of the article to be fried to obtain a material identification result;

c2: calling a preset threshold instruction corresponding to the material identification result from an instruction list; and

c3: in response to the preset threshold instruction, the working threshold of the driving power of the air circulation device 20 is regulated to be equal to a preset threshold, so that the real-time speed of the air flowing in the air explosion chamber is not greater than the maximum flowing speed.

It should be noted that, in the step C1 of the control method for an air fryer in the present application, the identification may be performed by, but not limited to, empirical judgment, machine vision or composition detection, and the like, which is not described herein again. It is understood that the correspondence between the preset threshold and the material in the instruction list of the present application may be obtained through human experience, or may be obtained through experiment or big data.

Further, since the driving power of the air circulation device 20 of the present application can be adjusted by modulating the parameter of a stepless control signal, in the step C3 of the control method for an air fryer of the present application: the operating threshold of the drive power of the air circulation device 20 can be regulated by modulating a parameter of a stepless control signal within a parameter modulation range.

In other words, when the working threshold of the driving power of the air circulation device 20 needs to be reduced, only a small parameter modulation range needs to be set, and at this time, the parameter of the stepless control signal is modulated within the parameter modulation range, so that it can be ensured that the driving power of the air circulation device 20 is not greater than the preset threshold; when the working threshold of the driving power of the air circulation device 20 needs to be increased, only a large parameter modulation range needs to be set.

It should be noted that, because the sensitivity of the articles to be fried made of different materials to temperature is different, the maximum temperature of the air in the air-frying chamber 10 needs to be selectively controlled for different articles to be fried, so as to avoid the air-frying effect of the articles to be fried being affected by over-high temperature, and even the articles to be fried being damaged. Specifically, according to the above-mentioned embodiment of the present application, as shown in fig. 1, the control method for an air fryer may further include the steps of:

d: the maximum temperature of the air in the air frying chamber 10 is selectively controlled according to the material of the articles to be fried contained in the air frying chamber 10, so that the maximum temperature of the air is matched with the articles to be fried.

Furthermore, since the air-frying process of air fryer 1 may be generally divided into different operating phases, when air fryer 1 is in different operating phases, air circulation device 20 of air fryer 1 needs to be controlled to adjust the flow rate of air within air-frying chamber 10, which helps to improve the air-frying effect of air fryer 1. Therefore, as shown in fig. 1, the control method for an air fryer of the present application may further include the steps of:

e: the air frying effect of the air fryer 1 is improved by controlling the flow rate of the air in the air frying chamber 10 by a stepless speed control method according to the working stage of the air fryer 1. Specifically, as shown in fig. 3, according to the foregoing embodiment of the present application, the stepless speed control method may include the steps of:

s100: modulating parameters of a stepless control signal according to the working stage of an air fryer 1; and

s200: in response to the modulated stepless control signal, the driving power of an air circulating device 20 of the air fryer 1 is steplessly adjusted to control the flow speed of the air in the air frying chamber 10 to meet the requirements of the air frying process.

Preferably, in the step D of the control method for an air fryer of the present application: and modulating the parameter of the stepless control signal in the parameter modulation range by the stepless speed control method so as to enable the real-time driving power of the air circulation device 20 not to be larger than the preset threshold value. Of course, in other examples of the present application, the stepless speed control method may also modulate the parameters of the stepless control signal over a full range to allow the air circulation device 20 to operate at full power, i.e., the preset threshold may be, but is not limited to, implemented as the rated power of the air circulation device 20.

It is noted that, as shown in fig. 6, the air circulation device 20 of the air fryer 1 may include, but is not limited to, a power supply circuit 21 for communicating with a power source E, a fan 22 provided to the power supply circuit 21, and a rotation speed adjusting means 23 provided to the power supply circuit 21, wherein the rotation speed adjusting means 23 is configured to instantaneously switch the real-time motor rotation speed of the fan 23 in response to the stepless control signal so as to achieve stepless adjustment of the driving power of the air circulation device 20. It will be appreciated that the fan 22 may be configured with either a dc or ac motor.

In particular, the stepless speed control method of the present invention is capable of steplessly adjusting the driving power of the air circulation device 20 by the stepless control signal so that the air circulation device 20 can be operated at any required driving power between zero power and full power. That is, the stepless speed control method of the present invention can operate the fan 22 of the air circulation device 20 in any rotation speed operation state (corresponding to any required driving power operation state of the air circulation device 20) between the full-speed operation state (corresponding to the full-power operation state of the air circulation device 20) and the stop operation state (corresponding to the zero-power operation state of the air circulation device 20), thereby continuously adjusting the flow speed of the air in the air frying cavity 10, unlike the conventional air fryer that can only operate the fan at full speed during the air frying process, so as to ensure that the stepless speed control method of the present invention can make the air flow rate and the air temperature in the air fryer 1 better meet the requirements of the air frying process.

Preferably, as shown in fig. 4, the stepless control signal of the present invention may be implemented as a pulse wave, wherein the parameter of the stepless control signal may include, but is not limited to, a duty cycle or a frequency of the pulse wave. It is understood that the pulse wave may be implemented as, but not limited to, a rectangular wave, a sawtooth wave, a triangular wave, a spike wave, a step wave, or the like, and the rectangular wave is exemplified below for convenience of description. In addition, the duty ratio of the pulse wave refers to a pulse width (i.e., a time T corresponding to a high level of the pulse wave within one pulse period T)₀) The ratio between said pulse period T, i.e. T₀/T。

Illustratively, as shown in fig. 6, the rotation speed adjusting device 23 of the air circulation device 20 may be implemented as a switching device 231, wherein the switching device 231 and the fan 22 are connected in series to the power supply circuit 21 for instantly switching the power supply circuit 21 on and off in response to the stepless control signal to switch the real-time motor rotation speed of the fan 23, thereby realizing stepless adjustment of the driving power of the air circulation device 20.

Specifically, as shown in fig. 5, the step S200 of the stepless speed control method may include the steps of:

s210: in response to the high level of the pulse wave, instantly turning on the power supply circuit 21 of the air circulation device 20 through the switching device 231, so that the current operating voltage of the fan 22 is equal to the real-time voltage applied to the fan 22 through the power supply circuit 21, so as to make the fan 22 in a high-speed operation state; and

s220: in response to the low level of the pulse wave, the power supply circuit 21 is instantaneously turned off by the switching device 231, so that the current operating voltage of the fan 22 is equal to zero, so that the fan 22 is in the low-speed operation state.

It should be noted that when the duty ratio of the pulse wave is increased, the pulse time of the pulse wave is increased, so that the time of the fan 22 of the air circulation device 20 in the high rotation speed operation state in one pulse period is prolonged, and the time of the fan 22 in the low rotation speed operation state is shortened, so that the effective motor rotation speed of the fan 22 in one pulse period is increased, and therefore the driving power of the air circulation device 20 is increased, so that the flow speed of the air driven by the air circulation device 20 is increased; accordingly, when the duty ratio of the pulse wave is adjusted to be small, the pulse time of the pulse wave becomes small, so that the time during which the fan 22 of the air circulation device 20 is in the high rotation speed operation state within one pulse period is shortened, and the time during which the fan 22 is in the low rotation speed operation state is prolonged, so that the effective motor rotation speed of the fan 22 within one pulse period is made small, and therefore the driving power of the air circulation device 20 becomes small, so that the flow speed of the air driven via the air circulation device 20 becomes small.

It is understood that the pulse frequency of the stepless control signal of the present invention may be above 50HZ, which means that the state switching frequency of the fan 22 of the air circulation device 20 is also above 50HZ (i.e. the fan 22 will switch state at least once within 20 ms), so as to improve the adjustment accuracy of the driving power of the air circulation device 20. Of course, in other examples of the present invention, the pulse frequency of the stepless control signal may also be less than 50HZ, and the present invention is not described in detail herein.

Preferably, the switching device 231 is implemented as a solid-state relay, so that a high-current load (such as the fan 22) can be directly driven by a small stepless control signal while the power supply circuit 21 is switched on and off at a high frequency. It can be understood that, although the conventional mechanical relay can also control the on or off of the output circuit, a large transient current exists at the moment of on or off, so that an electric spark may be generated at the moment of on or off to damage the life of the relay, and a great safety hazard exists. In addition, the conventional mechanical relay has a long action time, and the requirement of the stepless speed control method on high-frequency switching or instant switching cannot be met completely.

It is noted that, since the power supply used by the air fryer 1 in daily life usually provides ac power, for example, ac power with a frequency of 50HZ is usually adopted in china, and ac power with a frequency of 60HZ is usually adopted in the united states, when the power supply circuit 21 of the air circulation device 20 is immediately turned on by the switching device 231 of the air circulation device 20, the current operating voltage of the fan 22 of the air circulation device 20 also changes with time, so that the effective operating voltage of the fan 22 still changes with the change of the duty ratio of the wireless control signal.

Illustratively, as shown in fig. 7, taking as an example that the power source E provides an alternating current of 50HZ and the stepless control signal is a pulse wave with a frequency of 100HZ, when the duty ratio of the stepless control signal is 1/2, the effective operating voltage of the fan 22 is equal to half of the effective voltage of the power source E; when the duty ratio of the stepless control signal is adjusted to be smaller than 1/2, the effective operating voltage of the fan 22 is reduced to be smaller than half of the effective voltage of the power supply E, so that the driving power of the air circulation device 20 is reduced, that is, the motor speed of the fan 22 is reduced; when the duty ratio of the stepless control signal is adjusted to be larger than 1/2, the effective operating voltage of the fan 22 becomes larger than half of the effective voltage of the power source E, so that the driving power of the air circulation device 20, that is, the motor speed of the fan 22 becomes larger.

It is worth mentioning that the stepless speed control method of the present application can divide the working process of the air fryer 1 into four working stages, which are sequentially: a preheating stage, a primary heating stage, a constant temperature heating stage and a cooling stage. In particular, when the air fryer 1 is in the preheating stage, the air heating device 30 of the air fryer 1 starts heating, but the air heating efficiency is low due to the low temperature, and at this time, the rotation of the fan 22 needs to be stopped to ensure the rapid temperature rise of the air heating device 30; when the air fryer 1 is in the primary heating stage, the temperature of the air heating device 30 of the air fryer 1 is high, but the temperature difference of the air in the air frying cavity 10 is large, and at this time, the fan 22 needs to be rotated (for example, rotated at full speed) to reduce the temperature difference of the air in the air frying cavity 10, so that the temperature of the air in the air frying cavity 10 is kept uniform; when the air fryer 1 is in the constant temperature heating stage, the air temperature in the air frying cavity 10 reaches a preset target temperature, and at this time, the rotating speed of the fan 22 needs to be reduced to reduce heat loss, so that the temperature of the air flowing in the air frying cavity 10 is maintained within the upper limit and the lower limit of the preset target temperature; when the air fryer 1 is in the cooling stage, the air heating device 30 of the air fryer 1 stops heating, but the air is still heated due to its high temperature, and at this time, the fan 22 needs to be rotated at full speed to ensure that the temperature of the air heating device 30 and the air in the air frying chamber 10 is rapidly reduced so as to take out the articles to be fried.

Preferably, the stepless speed control method of the present application can divide the working phase of the air fryer 1 according to time. For example, within one minute after the air fryer 1 is started, the air fryer 1 is in the warm-up phase; between one and five minutes after the air fryer 1 is activated, the air fryer 1 is in the primary heating stage; between five minutes and twenty-five minutes after the air fryer 1 is started, the air fryer 1 is in the constant temperature heating phase; between twenty-five minutes and thirty minutes after the air fryer 1 is started, the air fryer 1 is in the cooling phase. It is understood that the time length of each working stage of the air fryer 1 is not limited thereto, and can be adaptively set according to the characteristics of the articles to be fried and the air frying requirement, which will not be described in detail herein.

Of course, in other examples of the present application, the stepless speed control method may also divide the operating phase of the air fryer 1 according to other factors such as temperature, or a combination of factors such as time and temperature. For example, after the air fryer 1 starts to start until the temperature of the air heating device 30 reaches a predetermined heating temperature (e.g., 300 ℃), the air fryer 1 is in the preheating phase; the air fryer 1 is in the primary heating stage when the temperature of the air heating means 30 reaches a predetermined heating temperature until the temperature of the air in the air frying chamber 10 reaches a preset target temperature; within a predetermined time after the temperature of the air in the air frying chamber 10 reaches the preset target temperature, the air fryer 1 is in the constant temperature heating stage; after the time for which the temperature of the air in the air-frying chamber 10 is maintained at the preset target temperature reaches the predetermined time until the temperature of the air heating means 30 reaches a predetermined cooling temperature (e.g., 40 ℃), the air-fryer 1 is in the cooling stage.

For example, as shown in fig. 8, the step S100 of the stepless speed control method may include the steps of:

s110: in response to the air fryer 1 being in a preheating phase, adjusting the duty ratio of the pulse wave to 0 so that the driving power of the air circulation device 20 is adjusted to zero power;

s120: in response to the air fryer 1 being in a primary heating phase, increasing the duty cycle of the pulse wave such that the driving power of the air circulation device 20 is steplessly increased;

s130: modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device 20 in response to the air fryer 1 being in a constant temperature heating phase; and

s140: in response to the air fryer 1 being in a cooling phase, the duty cycle of the pulse wave is adjusted to 1, so that the driving power of the air circulation device 20 is adjusted to full power.

It is noted that when air fryer 1 is in the primary heating stage, since the air temperature in air frying chamber 10 is initially low, and thus air fryer 1 is more urgently required to rapidly raise the air temperature, fan 22 of air circulating device 20 needs to be rotated at a low speed to circulate air in air frying chamber 10 at a low speed so as to rapidly raise the air temperature in air frying chamber 10; then, as the temperature of the air in air frying chamber 10 rises to approach the preset target temperature, it is more urgently necessary for air fryer 1 to keep the temperature of the air in air frying chamber 10 uniform throughout, and therefore, fan 22 of air circulating means 20 needs to be rotated at full speed to circulate the air in air frying chamber 10 rapidly so as to keep the temperature of the air in air frying chamber 10 as uniform as possible.

Preferably, the primary heating phase of the air fryer 1 may be further divided into a rapid warming phase and a uniform warming phase following the rapid warming phase, and the fan 22 of the air circulation device 20 needs to be rotated at a low speed when the air fryer 1 is in a rapid warming phase; when the air fryer 1 is in a uniform warming phase, the fan 22 of the air circulation device 20 needs to rotate at full speed. It is understood that the primary heating stage may be divided according to time or temperature, etc. to obtain the rapid warming stage and the uniform warming stage. For example, the rapid warming phase and the uniform warming phase may be demarcated by the air temperature in the air frying chamber 10 reaching 90-95% of the preset target temperature.

For example, as shown in fig. 8, the step S120 of the stepless speed control method may include the steps of:

s121: in response to the air fryer 1 being in a rapid warming-up phase of the primary heating phase, adjusting the duty ratio of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device 20 is adjusted to a low power; and

s122: in response to the air fryer 1 being in a uniform heating-up phase of the primary heating phase, the duty ratio of the pulse wave is adjusted to 1 so that the driving power of the air circulation device 20 is adjusted to full power.

Preferably, the preset low threshold may be implemented as 0.4 to 0.6. For example, the preset low threshold may be equal to 0.5, i.e. the duty cycle of the pulse wave is equal to 0.5, so that the air circulation device 20 is in a half-power operation state.

It is worth mentioning that, as shown in fig. 9, in the first example of the present application, when the air fryer 1 is in the constant temperature heating stage, the air fryer 1 may maintain the air temperature inside the air frying chamber 10 between the upper limit and the lower limit of the preset target temperature by adjusting the heating power of the air heating device 30, and reduce the fluctuation amplitude of the air temperature inside the air frying chamber 10. At this time, the stepless speed control method only needs to adjust the driving power of the air circulation device 20 in response to the air fryer 1 being in the constant temperature heating stage, so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30, which helps to reduce the fluctuation amplitude of the air temperature in the air frying chamber 10.

Illustratively, as shown in fig. 9, according to the above-described first example of the present application, in the step S130 of the stepless speed control method: in response to the air fryer 1 being in the constant temperature heating phase, adjusting the duty cycle of the pulse wave to a preset high threshold value to adjust the driving power of the air circulation device 20 to a high power so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30.

Preferably, the preset high threshold may be implemented as 0.7 to 0.9. For example, the preset high threshold value may be equal to 0.8, i.e. the duty cycle of the pulse wave is equal to 0.8, so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30.

In the second example of the present application, when the air fryer 1 is in the constant temperature heating stage, the air fryer 1 may also maintain the temperature of the air in the air frying chamber 10 between the upper limit and the lower limit of the preset target temperature by adjusting the driving power of the air circulation device 20, so as to reduce the fluctuation amplitude of the temperature of the air in the air frying chamber 10. At this time, the air fryer 1 may not adjust the heating power of the air heating device 30, and the stepless speed control method only needs to adjust the driving power of the air circulation device 20 correspondingly according to the temperature change condition of the air in the air frying cavity 10 in response to the air fryer 1 being in the constant temperature heating stage, so as to maintain the temperature of the air in the air frying cavity 10 between the upper limit and the lower limit of the preset target temperature.

Illustratively, as shown in fig. 10, according to the second example of the present application, the step S130 of the stepless speed control method may include the steps of:

s131: analyzing the temperature of the air flowing in the air frying chamber 10 of the air fryer 1 detected in real time in response to the air fryer 1 being in the constant temperature heating phase to obtain a temperature change of the air flowing in the air frying chamber 10;

s132: adjusting the duty ratio of the pulse wave so that the driving power of the air circulation device 20 is steplessly adjusted in response to the increase of the current temperature of the air to a first temperature threshold value between the upper limit and the lower limit of the preset target temperature; and

s133: in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the duty ratio of the pulse wave is adjusted down so that the driving power of the air circulation device 20 is steplessly adjusted down to maintain the temperature of the air in the air-frying chamber 10 between the upper limit and the lower limit of the preset target temperature.

Preferably, the first temperature threshold and the second temperature threshold may each be implemented as the preset target temperature so as to further reduce the upper limit and the lower limit of the preset target temperature. Of course, in other examples of the present invention, the first temperature threshold may be any temperature between the preset target temperature and the upper limit of the preset target temperature; the second temperature threshold may also be any temperature between the lower limit of the preset target temperature and the preset target temperature, which is not described in detail herein.

It is worth mentioning that fig. 11 to 13 show a variant implementation of the stepless speed control method according to the above-described embodiment of the utility model, wherein the parameter of the stepless control signal may include, but is not limited to, the frequency of the pulse wave. At this time, the rotation speed adjusting device 23 of the air circulation device 20 may be implemented as an inverter device 232, wherein the inverter device 232 and the fan 22 are disposed on the power supply circuit 21, and are used for instantly adjusting the power frequency provided to the fan 23 via the power supply circuit 21 through the inverter device 232 in response to the stepless control signal, so as to switch the real-time motor rotation speed of the fan 23, thereby realizing stepless adjustment of the driving power of the air circulation device 20.

It can be understood that, since the frequency converter 232 is an electric energy control device that converts a commercial power source into another frequency by using the on-off action of the power semiconductor device, the instant adjustment of the frequency of the power source supplied to the fan 23 via the power supply circuit 21 by the frequency converter 232 can be positively correlated with the frequency of the stepless control signal, that is, when the frequency of the pulse wave is increased, the instant adjustment of the frequency of the power source supplied to the fan 23 via the power supply circuit 21 by the frequency converter 232 is also increased; when the frequency of the pulse wave is adjusted to be small, the frequency of the power supply supplied to the fan 23 via the power supply circuit 21 is instantaneously adjusted by the frequency conversion device 232 to be small.

Illustratively, as shown in fig. 12, in the above modified embodiment of the present invention, the step S200 of the stepless speed control method may include the steps of:

s210': the frequency of the power supplied to the fan 23 via the power supply circuit 21 is instantaneously adjusted by the frequency conversion device 232 in response to the frequency of the pulse wave to steplessly adjust the motor rotation speed of the fan 22, so that the driving power of the air circulation device 20 is steplessly adjusted.

As shown in fig. 13, the step S100 of the stepless speed control method may include the steps of:

s110': in response to the air fryer 1 being in a preheating phase, adjusting the frequency of the pulse wave to 0HZ so that the fan 22 of the air circulation device 20 stops rotating;

s120': in response to the air fryer 1 being in a primary heating phase, the frequency of the pulse wave is increased so that the motor speed of the fan 22 of the air circulation device 20 is steplessly increased;

s130': modulating the frequency of said pulse wave to steplessly adjust the motor speed of said fan 22 of said air circulation means 20 in response to said air fryer 1 being in a thermostatic heating phase; and

s140': in response to the air fryer 1 being in a cooling phase, the frequency of the pulse wave is adjusted to the nominal frequency, so that the motor speed of the fan 22 of the air circulation device 20 is adjusted to the full speed.

Preferably, as shown in fig. 13, the step S130' of the stepless speed control method may include the steps of:

s131': analyzing the temperature of the air flowing in the air frying chamber 10 of the air fryer 1 detected in real time in response to the air fryer 1 being in the constant temperature heating phase to obtain a temperature change of the air flowing in the air frying chamber 10;

s132': in response to the current temperature of the air rising to the first temperature threshold value between the upper limit and the lower limit of the preset target temperature, increasing the frequency of the pulse wave so that the motor rotation speed of the fan 22 of the air circulation device 20 is steplessly increased; and

s133': in response to the current temperature of the air dropping to the second temperature threshold value between the upper and lower limits of the preset target temperature, the frequency of the pulse wave is turned down so that the motor speed of the fan 22 of the air circulation device 20 is steplessly turned down to maintain the temperature of the air in the air frying chamber 10 between the upper and lower limits of the preset target temperature.

Illustrative System

Referring to FIG. 14 of the drawings, a control system for an air fryer in accordance with an embodiment of the present invention is illustrated, wherein the control system 70 for an air fryer may include a drive control module 71, a heating control module 72 and a flow rate regulation module 73 communicatively coupled to each other, wherein the drive control module 71 is adapted to control an air circulation device of the air fryer to drive air to flow within an air fryer cavity of the air fryer; wherein said heating control module 72 is for controlling an air heating device of the air fryer to heat the air flowing within the air fryer cavity; the flow rate control module 73 is used for selectively controlling the flow rate of the air in the air frying cavity according to the material of the articles to be fried contained in the air frying cavity, so that the flow rate of the air is matched with the articles to be fried.

It should be noted that, in the above embodiment of the present application, as shown in fig. 14, the flow rate regulation module 73 may include a material identification module 731, a command invoking module 732, and a threshold value regulation module 733, which are communicably connected to each other, wherein the material identification module 731 is configured to identify the material of the to-be-fried item to obtain a material identification result; the instruction calling module 732 is configured to call a preset threshold instruction corresponding to the material identification result from an instruction list; the threshold value adjusting and controlling module 733 is configured to adjust the working threshold value of the driving power of the air circulation device to be equal to a preset threshold value in response to the preset threshold value instruction, so that the real-time speed of the air flowing in the air fryer cavity is not greater than the maximum flowing speed.

In an example of the present application, as shown in fig. 14, the control system 70 for an air fryer may further comprise a temperature regulation module 74, wherein the temperature regulation module 74 is configured to selectively regulate a maximum temperature of the air within the air fryer cavity according to the material of the item to be fried contained within the air fryer cavity, such that the maximum temperature of the air matches the item to be fried.

In an example of the present application, as shown in FIG. 14, the control system 70 for the air fryer may further comprise a stepless speed control system 40, wherein the stepless speed control system 40 may comprise a signal modulation module 41 and a power regulation module 42 communicatively connected to each other, wherein the signal modulation module 41 is configured to modulate a parameter of a stepless control signal according to the operating phase of the air fryer 1; wherein the power adjusting module 42 is used for adjusting the driving power of the air circulating device 20 steplessly in response to the steplessly controlled signal after being modulated to control the flow speed of the air in the air-frying chamber 10.

Referring to fig. 15 of the drawings, a stepless speed control system according to an embodiment of the present invention is illustrated, wherein said stepless speed control system 40 is adapted to an air fryer 1, and the air fryer 1 comprises an air-frying chamber 10, an air circulating means 20 for driving air to circulate in the air-frying chamber 10, and an air heating means 30 for heating the air circulating in the air-frying chamber 10.

Specifically, as shown in fig. 15, the stepless speed control system 40 may include a signal modulation module 41 and a power regulation module 42 communicatively connected to each other, wherein the signal modulation module 41 is configured to modulate a parameter of a stepless control signal according to the working phase of the air fryer 1; wherein the power adjusting module 42 is used for adjusting the driving power of the air circulating device 20 steplessly in response to the steplessly controlled signal after being modulated to control the flow speed of the air in the air-frying chamber 10.

It is noted that according to the above-described embodiments of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a duty cycle of the pulse wave.

More specifically, as shown in fig. 6 and 15, the power regulating module 42 is further configured to: in response to the high level of the pulse wave, a switching device 231 of the air circulation device 20 immediately turns on a power supply circuit 21 of the air circulation device 20, so that the current operating voltage of a fan 22 of the air circulation device 20 is equal to the real-time voltage applied to the fan 22 by the power supply circuit 21, so as to enable the fan 22 to be in a high-speed operation state; and instantaneously opening the power supply circuit 21 through the switching device 231 in response to the low level of the pulse wave so that the current operating voltage of the fan 22 is equal to zero, so that the fan 22 is in a low-speed operation state.

In the above embodiments of the present application, the signal modulation module 41 includes a duty cycle adjustment module 411, where the duty cycle adjustment module 411 is configured to: in response to the air fryer 1 being in a preheating phase, adjusting the duty ratio of the pulse wave to 0 so that the driving power of the air circulation device 20 is adjusted to zero power; in response to the air fryer 1 being in a primary heating stage, increasing the duty cycle of the pulse wave such that the driving power of the air circulation device 20 is steplessly increased; modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device 20 in response to the air fryer 1 being in a constant temperature heating phase; and adjusting the duty ratio of the pulse wave to 1 in response to the air fryer 1 being in a cooling stage, so that the driving power of the air circulation device 20 is adjusted to full power.

In an example of the present application, the duty cycle adjusting module 411 is further configured to: in response to the air fryer 1 being in a rapid heating-up stage of the primary heating stage, adjusting the duty ratio of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device 20 is adjusted to a low power; and adjusting the duty ratio of the pulse wave to 1 in response to the air fryer 1 being in a uniform heating-up stage of the primary heating stage, so that the driving power of the air circulation device 20 is adjusted to the full power.

In another example of the present application, the duty cycle adjusting module 411 is further configured to: in response to the air fryer 1 being in the constant temperature heating stage, the duty cycle of the pulse wave is adjusted to a preset high threshold value to adjust the driving power of the air circulation device 20 to a high power, so that the heat dissipation power of the air fryer 1 is equal to the heating power of the air heating device 30 of the air fryer 1.

According to the above embodiment of the present application, as shown in fig. 15, said signal modulation module 41 further comprises a temperature analysis module 412 communicatively connected with said duty ratio adjustment module 411, wherein said temperature analysis module 412 is configured to analyze the temperature of the air flowing in the air frying chamber 10 detected in real time in response to the air fryer 1 being in the constant temperature heating stage, so as to obtain the temperature variation of the air flowing in the air frying chamber 10; wherein the duty ratio adjusting module 411 is further configured to adjust the duty ratio of the pulse ratio larger in response to the current temperature of the air rising to a first temperature threshold value between an upper limit and a lower limit of a preset target temperature, so that the driving power of the air circulation device 20 is steplessly adjusted; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper and lower limits of the preset target temperature, decreasing the duty cycle of the pulse ratio such that the driving power of the air circulation device 20 is steplessly decreased to maintain the temperature of the air within the air frying chamber 10 between the upper and lower limits of the preset target temperature.

It should be noted that fig. 16 shows a modified embodiment of the stepless speed control system according to the above-mentioned embodiment of the present application. Specifically, the continuously variable speed control system 40 according to the modified embodiment of the present application is different in that: the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a frequency of the pulse wave.

In the above-mentioned modified embodiment of the present application, as shown in fig. 11 and 16, the power regulating module 42 is further configured to instantaneously regulate the frequency of the power supplied to a fan 22 of the air circulation device 20 via a power supply circuit 21 of the air circulation device 20 by a frequency conversion device 232 of the air circulation device 20 in response to the frequency of the pulse wave, so as to steplessly regulate the motor speed of the fan 22, so that the driving power of the air circulation device 20 is steplessly regulated.

In the above-mentioned modified embodiment of the present application, as shown in fig. 16, the signal modulation module 41 includes a frequency adjustment module 413, wherein the frequency adjustment module 413 is configured to adjust the frequency of the pulse wave to 0 in response to the air fryer 1 being in a preheating stage, so that the fan 22 of the air circulation device 20 stops rotating; in response to the air fryer 1 being in a primary heating phase, increasing the frequency of the pulse wave such that the motor speed of the fan 22 is steplessly increased; modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan 22 in response to the air fryer 1 being in a thermostatic heating phase; and adjusting the frequency of the pulse wave to a nominal frequency in response to the air fryer 1 being in a cooling phase, such that the motor speed of the fan 22 is adjusted to full speed.

Preferably, said signal modulation module 41 further comprises a temperature analysis module 412 communicably connected to said frequency adjustment module 413, wherein said temperature analysis module 412 is configured to analyze the temperature of the air flowing in the air frying chamber 10 detected in real time in response to the air fryer 1 being in the constant temperature heating stage, so as to obtain the temperature variation of the air flowing in the air frying chamber 10; wherein the frequency adjustment module 413 is further configured to increase the frequency of the pulse ratio in response to the current temperature of the air increasing to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, such that the motor speed of the fan 22 is steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper and lower limits of the preset target temperature, decreasing the frequency of the pulse ratio such that the motor speed of the fan 22 is steplessly decreased to maintain the temperature of the air within the air frying chamber between the upper and lower limits of the preset target temperature.

Illustrative apparatus

Next, an electronic apparatus according to an embodiment of the present invention is described with reference to fig. 17 (fig. 17 shows a block diagram of the electronic apparatus according to the embodiment of the present invention). As shown in fig. 17, the electronic device 60 includes one or more processors 61 and a memory 62.

The processor 61 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 60 to perform desired functions.

The memory 62 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium and executed by the processor 61 to implement the methods of the various embodiments of the utility model described above and/or other desired functions.

In one example, as shown in fig. 17, the electronic device 60 may further include: an input device 63 and an output device 64, which are interconnected by a bus system and/or other form of connection mechanism (not shown).

The input device 63 may be, for example, a camera module or the like for capturing image data or video data.

The output device 64 can output various information including the classification result and the like to the outside. The output devices 64 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, among others.

Of course, for the sake of simplicity, only some of the components of the electronic device 60 related to the present invention are shown in fig. 17, and components such as a bus, an input/output interface, and the like are omitted. In addition, the electronic device 60 may include any other suitable components depending on the particular application.

It is noted that, as shown in fig. 18-21, an embodiment of the present invention may further provide an air fryer apparatus, wherein the air fryer apparatus may comprise an air fryer 1 and the above-mentioned stepless speed control system 40, wherein the stepless temperature control system 40 is configured at the air fryer 1, and the stepless temperature control system 40 is used for controlling the flow speed of the air in the air fryer 1, which helps to improve the air-frying effect of the air fryer 1.

Specifically, the air fryer 1 may include an air-frying chamber 10 for containing an article to be fried, an air circulating device 20 for driving air to circulate in the air-frying chamber 10, and an air heating device 30 for heating the air flowing in the air-frying chamber 10. The stepless speed control system 40 may comprise a signal modulation module 41 and a power regulation module 42 which are communicably connected to each other, wherein the signal modulation module 41 is configured to modulate a parameter of a stepless control signal according to the working phase of the air fryer 1; wherein the power adjusting module 42 is used for adjusting the driving power of the air circulating device 20 steplessly in response to the steplessly controlled signal after being modulated to control the flow speed of the air in the air-frying chamber 10. Thus, after the air-frying chamber 10 is filled with the articles to be fried, the air heated by the air heating device 30 will contact the articles to be fried under the driving of the air circulation device 20, so as to complete the air-frying process of the articles to be fried. Meanwhile, the stepless speed control system 40 regulates and controls the flow speed of the air in the air fryer 1 according to the working stage of the air fryer 1, so as to improve the air frying effect of the air fryer 1 on the articles to be fried.

It is noted that, in the above-mentioned embodiment of the present application, the air heating device 30 may be, but is not limited to, implemented as an electric heater 31 disposed in the air frying chamber 10, wherein the electric heater 31 is used for converting electric energy into heat energy to heat the air in the air frying chamber 10. Of course, in other examples of the present application, the air heating device 30 may also be implemented as a fluid heat exchanger disposed in the air-frying chamber 10, wherein the fluid heat exchanger is used for transferring heat energy of a hot fluid to the air in the air-frying chamber 10 to heat the air in the air-frying chamber 10.

Further, according to the above-mentioned embodiment of the present application, as shown in fig. 6 and 11, the air circulation device 20 of the air fryer 1 may include, but is not limited to, a power supply circuit 21 for communicating with a power source E, a fan 22 provided to the power supply circuit 21, and a rotation speed adjusting means 23 provided to the power supply circuit 21, wherein the rotation speed adjusting means 23 is configured to instantaneously switch the real-time motor rotation speed of the fan 23 in response to the stepless control signal so as to achieve stepless adjustment of the driving power of the air circulation device 20. It will be appreciated that the fan 22 may be configured with either a dc or ac motor. It is understood that the rotation speed adjusting means 23 of the air circulation device 20 may be implemented as the switching means 231 or the frequency conversion means 232.

Illustratively, as shown in fig. 19 to 21, the air-frying chamber 10 of the air fryer 1 may include a housing 11 defining an internal chamber 110, and an air-frying member 12, wherein the air-frying member 12 is disposed in the housing 11, and the air-frying member 12 is configured to hold the articles to be fried in the internal chamber 110, so that the air heated by the air heating device 30 can circulate in the internal chamber 110 of the air-frying chamber 10 to contact the articles to be fried under the driving of the air circulating device 20, thereby completing the air-frying process of the articles to be fried.

Preferably, the air-frying unit 12 is detachably disposed on the housing 11, so as to conveniently pick up and place the articles to be fried in the air-frying unit 12. For example, the air-fryer components 12 may be mounted to the housing 11 by, but not limited to, snap-fitting or door-locking. It will be appreciated that the air-frying member 12 may be, but is not limited to being, embodied as a container such as a basket with mesh openings. Of course, the air-frying member 12 may be other types of members such as a rotisserie or skewer, so long as the fried item is retained within the interior chamber 110 of the housing 11, and the present invention will not be described in detail herein.

According to the above embodiment of the present invention, as shown in fig. 20, the fan 22 of the air circulation device 20 generally comprises a motor 221 and a fan assembly 222, wherein the fan assembly 222 is drivably disposed on the motor 221 for rotating under the driving of the motor 221 to fan the air to circularly flow in the air frying cavity 10.

It should be noted that, in order to solve the problem that the temperature of the air (hereinafter referred to as hot air) heated by the air heating device 30 is high and the hot air takes away moisture of the fried goods to form a high-temperature and humid environment in the air frying chamber 10, and the operation of the motor 221 of the fan 22 in the high-temperature and humid environment will seriously affect the service life and safety performance, the air frying chamber 10 of the air fryer 1 of the present invention may further include a partition member 13, wherein the partition member 13 is disposed in the inner chamber 110 of the housing 11 to partition the inner chamber 110 into an upper compartment 1101 and a lower compartment 1102. The motor 221 of the fan 22 is disposed in the upper compartment 1101 of the internal chamber 110, and the fan assembly 222 of the fan 22 may include a first fan blade 2221 located in the lower compartment 1102 of the internal chamber 110 for circulating the fanned air in the lower compartment 1102 under the driving of the motor 221. At the same time, the air frying unit 12 and the air heating device 30 are disposed in the lower compartment 1102 of the internal chamber 110 to form a high temperature and humid environment in the lower compartment 1102 of the internal chamber 110, so that the upper compartment 1101 of the internal chamber 110 is kept in a relatively dry environment while ensuring the completion of the air frying process for the articles to be fried, which contributes to the improvement of the service life and safety of the motor 221 of the fan 22.

Preferably, the partition assembly 13 of the air fryer 10 may include an upper partition 131 and a lower partition 132, wherein the upper partition 131 and the lower partition 132 are spaced apart from each other in the inner chamber 110 of the outer casing 11 to form a middle partition 1103 between the upper compartment 1101 and the lower compartment 1102 by the upper partition 131 and the lower partition 132, that is, the upper partition 131 and the lower partition 132 divide the inner chamber 110 into the upper compartment 1101, the middle partition 1103 and the lower compartment 1102 from top to bottom, so that the heat blocked in the lower compartment 1102 by the middle partition 1103 is substantially transferred to the upper compartment 1101, thereby preventing the motor 221 of the fan 22 from operating in a high temperature environment.

More preferably, the fan blade assembly 222 of the fan 22 may further include a second fan blade 2222 located in the middle partition 1103 of the inner chamber 110, for blowing air to flow in the middle partition 1103 under the driving of the motor 211, so as to enhance the heat insulation effect of the middle partition 1103. It can be understood that the first blade 2221 and the second blade 2222 are both disposed at the output shaft of the motor 221, and the second blade 2222 is located between the first blade 2221 and the main body of the motor 221, that is, the first blade 2221 is located outside the second blade 2222, so that the first blade 2221 serves as the outer blade of the fan 22 and the second blade 2222 serves as the inner blade of the fan 22.

It is worth mentioning that, according to the above embodiment of the present invention, the air fryer 1 may further comprise a temperature sensor 50, wherein the temperature sensor 50 is disposed inside the air frying chamber 10, and the temperature sensor 50 is communicably connected to the temperature analyzing module 412 of the stepless speed control system 40, wherein the temperature sensor 50 is configured to detect the temperature of the air flowing inside the air frying chamber 10 in real time, and transmit the detected temperature data to the temperature analyzing module 412 to be analyzed. It will be appreciated that the temperature sensor 50 may be, but is not limited to being, implemented as an NTC temperature sensor.

Preferably, the temperature sensor 50 is disposed in the lower compartment 1102 of the inner chamber 110 of the housing 11 at a position adjacent to the air heating device 30 so as to accurately detect the real-time temperature of the air circulating in the lower compartment 1102.

It is noted that the stepless speed control system 40 of the air-fryer apparatus of the present invention may be, but is not limited to being, implemented as a single chip microcomputer or a control chip, wherein the single chip microcomputer or the control chip is built into the air-fryer cavity 10 of the air-fryer 1, so that the air-fryer apparatus can be used as an integrated apparatus. Of course, in other examples of the utility model, the stepless speed control system 40 of the air-fryer apparatus may also be implemented as a control terminal, wherein the control terminal is external to the air-fryer 1, so that the air-fryer apparatus can be used as a split-type apparatus. It will be appreciated that the control terminal is communicatively coupled to the air fryer 1, and the air fryer 1 can still be controlled by the control terminal for stepless temperature control, so as to achieve good air frying performance.

It is worth mentioning that according to another aspect of the present application, an embodiment of the present application further provides an air fryer apparatus, wherein the air fryer apparatus may include an air fryer 1 and the above control system 70 for the air fryer, wherein the control system 70 for the air fryer is configured to the air fryer 1 for regulating the air-frying process of the air fryer 1, which helps to improve the air-frying effect of the air fryer 1.

The block diagrams of devices, apparatuses, systems involved in the present invention are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the apparatus, devices and methods of the present invention, the components or steps may be broken down and/or re-combined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are given by way of example only and are not limiting of the utility model. The objects of the utility model have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. Air-fry apparatus for air-frying items to be fried with air, wherein the air-fry apparatus comprises:

an air fryer, wherein said air fryer comprises:

an air-frying chamber for receiving the articles to be fried;

2. The air-fry apparatus of claim 1 wherein the air-fry chamber comprises a housing defining an interior chamber and an air-fry element, wherein the air-fry element is disposed in the housing and the air-fry element is for holding the articles to be fried in the interior chamber.

3. An air-fryer according to claim 1 or 2, wherein said air circulating means comprises a power supply circuit for communicating with a power source, a fan provided in said power supply circuit, and a speed regulating means provided in said power supply circuit for instantaneously switching the real motor speed of said fan based on said stepless control signal to achieve stepless regulation of said driving power of said air circulating means.

4. An air-fryer according to claim 3, wherein the stepless control signal is a pulse wave and the parameter of the stepless control signal comprises the duty cycle of the pulse wave, wherein said rotation speed regulating means of said air circulating means is implemented as a switching means.

5. The air fryer apparatus of claim 4, wherein said power conditioning module is further for: responding to the high level of the pulse wave, immediately conducting the power supply circuit through the switching device, so that the current working voltage of the fan is equal to the real-time voltage applied to the fan through the power supply circuit, and the fan is in a high-rotating-speed running state; and responding to the low level of the pulse wave, immediately disconnecting the power supply circuit through the switching device, so that the current working voltage of the fan is equal to zero, and the fan is in a low-speed running state.

6. The air fryer of claim 5, wherein the signal modulation module comprises a duty cycle adjustment module, wherein the duty cycle adjustment module is configured to: in response to the air fryer being in a preheating stage, adjusting the duty ratio of the pulse wave to 0 so that the driving power of the air circulation device is adjusted to zero power; in response to the air fryer being in a primary heating stage, increasing the duty cycle of the pulse wave such that the driving power of the air circulation device is steplessly increased; modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device in response to the air fryer being in a constant temperature heating phase; and adjusting the duty ratio of the pulse wave to 1 in response to the air fryer being in a cooling phase, such that the driving power of the air circulation device is adjusted to full power.

7. The air fryer of claim 6, wherein said signal modulation module further comprises a temperature analysis module communicatively interconnected with said duty cycle adjustment module, wherein said temperature analysis module is configured to analyze the temperature of the air flowing within the air fryer cavity detected in real time in response to the air fryer being in the constant temperature heating phase to obtain a temperature change of the air flowing within the air fryer cavity; wherein the duty ratio adjusting module is further configured to increase the duty ratio of the pulse ratio in response to a current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, such that the driving power of the air circulation device is steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper and lower limits of the preset target temperature, decreasing the duty cycle of the pulse ratio such that the driving power of the air circulation device is steplessly decreased to maintain the temperature of the air within the air cavity between the upper and lower limits of the preset target temperature.

8. The air fryer of claim 7, wherein the air fryer further comprises a temperature sensor, wherein the temperature sensor is disposed within the air fryer cavity and the temperature sensor is communicatively coupled to the temperature analysis module of the stepless speed control system for detecting the temperature of the air flowing within the air fryer cavity in real time and transmitting the detected temperature data to the temperature analysis module.

9. The air-fryer of claim 4, wherein said switching device is a solid state relay.

10. Air-frying device according to claim 3, wherein the stepless control signal is a pulsed wave and the parameter of the stepless control signal comprises the frequency of the pulsed wave, wherein the rotational speed regulating means of the air circulation means is embodied as a frequency conversion means.

11. The air-frying apparatus of claim 10, wherein said power regulating module is further for regulating the frequency of the power supplied to the fan via the power supply circuit in real time by the frequency conversion device in response to the frequency of the pulse wave to steplessly regulate the motor speed of the fan such that the driving power of the air circulating means is steplessly regulated.

12. The air fryer of claim 11, wherein said signal modulation module comprises a frequency adjustment module, wherein said frequency adjustment module is operable to adjust the frequency of the pulse wave to 0 in response to the air fryer being in a preheat phase such that the fan of the air circulation device stops rotating; in response to the air fryer being in a primary heating stage, increasing the frequency of the pulse wave such that the motor speed of the fan is steplessly increased; modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan in response to the air fryer being in a constant temperature heating phase; and adjusting the frequency of the pulse wave to a rated frequency in response to the air fryer being in a cooling stage, so that the motor speed of the fan is adjusted to a full speed.

13. Air-fry apparatus for air-frying items to be fried with air, wherein the air-fry apparatus comprises:

an air fryer, wherein said air fryer comprises:

an air-frying chamber for receiving the articles to be fried;