Air fryer

Abstract

The air fryer comprises a steam generation assembly and a machine body internally provided with a cooking cavity, the steam generation assembly conveys steam into the cooking cavity, the steam generation assembly comprises a water tank, an adapter box used for installing the water tank, an evaporation box and a water conveying pipeline communicating the adapter box with the evaporation box, and the water tank and the evaporation box form a communicating vessel; water in the water tank sequentially flows through the switching box and the water conveying pipeline, then enters the evaporation box and is evaporated in the evaporation box to form steam, the switching box is connected with the water conveying pipeline through the water outlet connector, and a plurality of protruding structures are arranged on the inner wall of the water outlet connector. The speed of water flowing through the water outlet connector can be changed through the arrangement of the protruding structure at the water outlet connector, so that pressure difference is formed at the water inlet end and the water outlet end of the water outlet connector, water can flow to the water conveying pipeline, the water blocking phenomenon at the water outlet connector is avoided, the protruding structure can disturb water flowing, and the water blocking effect is improved. Therefore, boundary layer separation occurs when water flows through the protruding structure, and the wall attachment performance of the water in the water outlet connector is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of household appliances, and particularly relates to an air fryer. BACKGROUND

[0002] The air fryer is heated by high-temperature hot air instead of oil frying, and in the heating process, the hot air is easy to take away the moisture in the food, so that the food after cooking has a dry taste, which affects the user experience. To improve this problem, the existing air fryer will humidify the food during cooking by water replenishment and humidification to avoid excessive evaporation of moisture in the food and achieve tender roasting effect.

[0003] There are two ways to replenish water and humidify in the prior art: one is to set up electric control elements such as water pumps to pump water in the water tank to the steam generator, the steam generator receives water from the water tank and heats it into steam to supply to the cooking cavity, the use of water pump and other elements for water delivery will increase the production cost of the air fryer, and it is not convenient to control whether water needs to be replenished according to the actual temperature during cooking, and if temperature sensors and other detection elements need to be added, the cost will be further increased; the other is to directly connect the water tank and the steam generator through a water conveying pipeline to realize automatic water replenishment by using the principle of communicating vessels, when the water tank is placed on the air fryer, as the water level in the water tank drops, a negative pressure area will be formed in the water tank, the existence of the negative pressure area will attract external air into the water tank to balance the pressure difference between the inside and outside of the water tank, when the air enters the water tank, air bubbles will be formed, due to space limitation, the outlet of the water tank and the inner diameter of the water conveying pipeline generally will not be too large, and the nested design of the water conveying pipeline, the water outlet of the water tank and the water inlet of the steam generator will further reduce the flow area of the nested position, not only the air bubbles are easy to block the pipeline at this position, causing poor air intake and water discharge, resulting in water replenishment failure, but also when the water is adsorbed to the pipe wall due to the action of water tension during water discharge, the water column will also block the cross section of the pipeline, so that a section of water is trapped at a certain position of the pipeline, causing external air to not enter, resulting in poor water discharge and water replenishment failure, and the humidification effect on the food cannot be achieved. Practical new type content

[0004] The application provides an air fryer to solve the technical problem that the existing air fryer using communicating vessels for automatic water replenishment is easy to cause water blockage and poor water discharge during water replenishment, resulting in decreased water replenishment efficiency or even water replenishment failure.

[0005] The technical solution adopted by the application is:

[0006] An air fryer comprises a steam generating assembly and a body with a cooking cavity, the steam generating assembly delivers steam into the cooking cavity, the steam generating assembly comprises a water tank, an adapter box for mounting the water tank, an evaporation box and a water delivery pipeline connecting the adapter box and the evaporation box, the water tank and the evaporation box constitute a communicating vessel, water in the water tank flows into the evaporation box through the adapter box and the water delivery pipeline in sequence and evaporates in the evaporation box to form steam, the adapter box is connected with the water delivery pipeline through a water outlet joint, and the inner wall of the water outlet joint is provided with a plurality of protruding structures.

[0007] The inner wall of the water outlet joint is provided with a plurality of protruding structures, according to the continuity principle of fluid flow, when water flows through the protruding structures, the cross-sectional area of the water outlet joint at the distribution position of the protruding structures decreases, which causes the water flow rate to increase, thereby forming a local high-speed area upstream of the protruding structures, according to Bernoulli's principle, the increase of water flow rate causes the local pressure to drop. Therefore, the water pressure upstream of the protruding structures decreases, and the water flow rate downstream of the protruding structures slows down, and the pressure relatively increases, thereby forming a pressure difference between the water inlet end and the water outlet end of the water outlet joint, which helps the water flow to the water delivery pipeline and avoids the water blockage phenomenon at the water outlet joint, thereby ensuring the water flow from the adapter box to the evaporation box, thereby ensuring the water supply and realizing the humidification of the food materials during the cooking process.

[0008] Moreover, the protruding structures will disturb the flow of water, causing the boundary layer of water to separate when flowing through the protruding structures, forming turbulent flow and vortex flow, that is, upstream of the protruding structures, the boundary layer of water may adhere to the inner wall of the water outlet joint, but downstream of the protruding structures, the adhesion performance between the water and the water outlet joint decreases, and the boundary layer separates to provide a channel for the back gas, thereby ensuring the air supply in the water tank and enabling the water in the water tank to be supplied to the evaporation box.

[0009] The air fryer in the present application further comprises the following additional technical features:

[0010] The protruding structure is a protruding rib extending from the water inlet end to the water outlet end of the water outlet joint, and a recessed channel is formed between adjacent two protruding structures.

[0011] In the technical solution, the protruding structure is a protruding rib, and the protruding rib extends from the water inlet end to the water outlet end of the water outlet joint, thereby realizing the continuous arrangement of the protruding rib, and forming a complete channel between adjacent two protruding ribs. The existence of the channel can effectively guide the external air to flow into the water tank, thereby realizing the fluid communication between the water tank and the evaporation box, enabling the water in the water tank to be smoothly supplied to the evaporation box, on the other hand, the channel can disperse the water flow and reduce the water flow impact sound, thereby reducing the noise pollution, and on the other hand, the channel can also reduce the adhesion performance of the water, thereby reducing the occurrence of water blockage.

[0012] The convex rib comprises a fixed end fixed to the inner wall surface of the water outlet joint, and a free end extending towards the center of the water outlet joint, the thickness of the convex rib gradually decreases from the fixed end to the free end to form a turbulence tooth.

[0013] In the technical solution, the gradual change of the thickness of the convex rib from the fixed end to the free end forms a turbulence tooth, when water flows through the turbulence tooth, on the one hand, it causes disturbance of the water flow, increases the turbulence degree of the water, reduces the wall attachment capacity of the water in the water outlet joint, provides a path for aeration, on the other hand, the turbulence tooth destroys the surface tension of the water flow, prevents the water column from being blocked in the water outlet joint and unable to flow to the water delivery pipeline, and further, the existence of the turbulence tooth can also break the bubbles to avoid excessive bubbles from blocking the water outlet joint.

[0014] The water delivery pipeline has a water outlet section extending into the evaporation box, a water replenishment gap exists between the bottom end of the water outlet section and the bottom wall of the evaporation box, and the bottom end of the water outlet section is locally concave upward to form an air replenishment port.

[0015] In the technical solution, the water tank and the evaporation box constitute a communication device, when the liquid level in the evaporation box is lower than the bottom end of the water outlet section, air is supplied to the water tank through the water delivery pipeline, the water tank starts to automatically replenish water to the evaporation box, and when the liquid level submerges the bottom end of the water outlet section, the communication device is isolated from air, and the water tank automatically stops replenishing water. Preferably, the air replenishment port is additionally provided on the side wall of the water outlet section, so that the bottom end of the water outlet section does not have to be completely exposed, air can enter the water delivery pipeline through the air replenishment port, and then enter the interior of the water tank, the water tank starts to automatically replenish water, improves the timeliness of water replenishment, avoids the decline of cooking effect caused by short-term water shortage, and ensures the tender roasting effect of food materials.

[0016] In addition, the air replenishment port also destroys the regular shape of the water outlet section, which can prevent the occurrence of water blocking phenomenon caused by the stagnation of the water column in the water outlet section.

[0017] The height H of the water replenishment gap satisfies: 3mm≤H≤10mm.

[0018] In the technical solution, by optimizing the height of the water replenishment gap, on the one hand, the probability of water blocking the water outlet section due to the action of tension can be further reduced, and smooth aeration can be realized, on the other hand, the air outlet amount and air outlet efficiency can be further balanced, and the problem of requiring more heat to make the water in the evaporation box boil due to the need to store a lot of water in the evaporation box to stop water replenishment can be avoided, thereby reducing the problem of low steam efficiency.

[0019] A drain valve is arranged at the water outlet of the water tank, a trigger part for pushing the drain valve to move to open the water outlet is arranged on the upstream of the water outlet joint of the adapter box, and the trigger part is located on the circumferential outer side of the water inlet end of the water outlet joint.

[0020] The water tank outlet is provided with a drain valve, which provides protection against water leakage during the process of inverting and placing the water tank, and the water tank can be placed and taken, which facilitates the user to clean the water tank thoroughly and replenish water in the water tank. By setting a trigger part capable of pushing and moving the drain valve upstream of the water outlet connector of the adapter box, the water tank can be assembled to the air fryer, and the water outlet can be opened through the cooperation of the trigger part and the drain valve. The whole operation is convenient and fast, without the need for additional operation, which improves the user experience. Due to the setting of the protruding structure, the inner diameter of the water outlet connector has been reduced. The trigger part is arranged on the outer side of the water inlet end of the water outlet connector, which can avoid occupying the space inside the water outlet connector, ensure the flow area of water at the water outlet connector, and further reduce the probability of water blockage at the water outlet connector.

[0021] The trigger part is an annular structure arranged around the water outlet connector, and the trigger part is provided with a flow passage communicating the water outlet and the water outlet connector; or the trigger part is provided with a plurality of trigger parts, and the plurality of trigger parts are arranged around the water inlet end of the water outlet connector, and the plurality of trigger parts form a flow passage communicating the water outlet and the water outlet connector.

[0022] In the technical solution, the arrangement of the flow passage provides a path for the flow of water from the water tank to the water supply pipeline through the water outlet connector, and also provides a path for air from the water supply pipeline and the water outlet connector to supply water into the water tank. Whether the trigger part is arranged as an annular structure around the water outlet connector or a plurality of trigger parts are arranged around the water inlet end of the water outlet connector, the water flow can be disturbed to form a vortex at the water inlet end of the water outlet connector, optimize the water flow field, avoid water blockage at the water outlet connector, and provide protection for smooth water supply from the water tank to the evaporation box.

[0023] The drain valve comprises a movable rod and a sealing gasket arranged at one end of the movable rod, the water outlet of the water tank is provided with a mounting plate for mounting the movable rod, the mounting plate is provided with a plurality of through water holes, and the movable rod drives the sealing gasket to move to open or block the water holes.

[0024] The end of the movable rod is provided with a sealing gasket, which can effectively seal the water outlet of the water tank, prevent water leakage during taking, placing and moving the water tank, and improve the sealing performance of the drain valve.

[0025] The water delivery pipeline comprises a first pipeline at one end of the water outlet connector and a second pipeline at one end of the evaporation box, and the pipe walls of the first pipeline and the second pipeline are made of different materials.

[0026] In the technical solution, the pipe walls of the first pipeline and the second pipeline are made of different materials, so that the flow characteristics of water change when flowing through the first pipeline and the second pipeline made of different materials, including flow velocity distribution, pressure loss, etc. These changes will cause changes in the wall adhesion performance and surface tension of water in the first pipeline and the second pipeline, and help water and the pipe wall to separate when flowing through the connection position of the first pipeline and the second pipeline, facilitating air supplement and avoiding water blockage.

[0027] The air fryer further comprises a reflecting cover arranged on the machine body, a cooking cavity is formed below the reflecting cover, a hot air assembly is arranged in the cooking cavity, the water tank is arranged outside the cooking cavity, the evaporation box is arranged in the cooking cavity, the first pipeline is a plastic pipe or a silica gel pipe, the second pipeline is a metal pipe, the reflecting cover is provided with a through hole through which the first pipeline passes, the first pipeline and the through hole are in interference fit, and one end of the second pipeline is inserted into the first pipeline.

[0028] In the technical solution, the evaporation box is arranged in the cooking cavity. When there is no water in the water tank, the evaporation box has the risk of being dry-burned, thereby causing the temperature of the evaporation box to rise. The metal pipe is connected to the evaporation box as the second pipeline. Even if the phenomenon of dry burning of the evaporation box occurs during the operation of the air fryer, the working temperature of the first pipeline can be reduced by using the transition of the metal pipe due to the good temperature resistance of the metal pipe, thereby prolonging the service life of the first pipeline and ensuring the stability and reliability of the humidifying operation. The first pipeline is a plastic pipe or a silica gel pipe, the reflecting cover is provided with a through hole for the first pipeline to pass through, and the first pipeline is in interference fit with the through hole of the reflecting cover. By means of the elastic property of the first pipeline itself, the sealing of the first pipeline to the position of the through hole of the reflecting cover is realized, so that a separate sealing element is saved, the cost is reduced, the sealing performance of the through hole is ensured, the hot gas in the cooking cavity is prevented from leaking from the through hole, and the thermal efficiency in the cooking cavity is ensured. In addition, the interference fit of the first pipeline with the through hole of the reflecting cover also provides positioning for the first pipeline, so that the first pipeline is not easy to be displaced during the plug-in connection of the first pipeline and the second pipeline. Not only does this help to improve the assembly efficiency between the two, but also helps to keep the second pipeline in the preset installation position after installation, so that the relative positional relationship between the second pipeline and the evaporation box is not easy to be changed. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of this application and help to explain the present application, but do not limit the present application in any inappropriate manner. In the drawings:

[0030] Figure 1 is a sectional view of the air fryer according to an embodiment of the present application;

[0031] Figure 2 is an enlarged view of A of Figure 1

[0032] Figure 3 is a sectional view of the air fryer according to an embodiment of the present application;

[0033] Figure 4 is a perspective view of the air fryer according to an embodiment of the present application;

[0034] Figure 5 is an assembly schematic view of the reflecting cover, the evaporation box and the hot air assembly according to an embodiment of the present application;

[0035] Figure 6 is an assembly schematic view of the reflecting cover and the water supply pipeline according to an embodiment of the present application.

[0036] Among them,

[0037] ​1, body; 11, base; 12, head; 13, cooking cavity; 14, reflector; 15, heating tube; 16, fan;

[0038] 2, water tank; 21, movable rod; 211, linkage rod; 212, pushing part; 213, elastic reset member; 22, sealing gasket; 23, mounting plate; 24, water passing hole;

[0039] 3, adapter box; 31, water outlet connector; 311, convex rib; 32, triggering part; 33, adapter cavity;

[0040] 4, evaporation box; 41, air inlet; 42, air outlet;

[0041] 5, first pipeline;

[0042] 6, second pipeline; 61, air supplementing port. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0044] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment can be combined with each other without conflict.

[0045] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0048] Compared with the technical solution of pumping water in the water tank to the steam generating device by using a pumping element such as a water pump, the automatic water replenishment realized by using the principle of a communicating vessel can greatly reduce the production manufacturing cost. However, due to the limitation of installation space and the like, the diameter of the water conveying pipeline between the water tank and the steam generating device, the diameter of the water outlet of the water tank, and the diameter of each adapter in the water flow path are generally not too large, thereby causing the water to be trapped during the water replenishment process, causing the communicating vessel formed by the water tank and the steam generating device to fail to exchange air, thereby causing the water replenishment to fail.

[0049] In view of this, as shown in Figure 1 、 Figure 3 and Figure 4 , the present application provides an air fryer, which comprises a steam generating assembly and a body 1 internally provided with a cooking cavity 13, the steam generating assembly delivers steam into the cooking cavity 13, the steam generating assembly comprises a water tank 2, an adapter box 3 for mounting the water tank, an evaporation box 4, and a water conveying pipeline connecting the adapter box 3 and the evaporation box 4, the water tank 2 and the evaporation box 4 constitute a communicating vessel, the water in the water tank 2 flows through the adapter box 3 and the water conveying pipeline in sequence and then enters the evaporation box 4, and the water is evaporated in the evaporation box 4 to form steam, the adapter box 3 is connected with the water conveying pipeline through a water outlet connector 31, and the inner wall of the water outlet connector 31 is provided with a plurality of protruding structures.

[0050] The inner wall of the water outlet joint 31 is provided with a plurality of protruding structures. According to the continuity principle of fluid flow, when water flows through the protruding structures, the cross-sectional area of the water outlet joint 31 at the position where the protruding structures are distributed will decrease, resulting in an increase in the flow rate of the water, thereby forming a local high-speed area upstream of the protruding structures. According to Bernoulli's principle, an increase in the flow rate of the water will result in a decrease in the local pressure. Therefore, upstream of the protruding structures, the pressure of the water will decrease, and downstream of the protruding structures, the flow rate of the water will slow down, and the pressure will relatively increase, thereby forming a pressure difference between the water inlet end and the water outlet end of the water outlet joint 31, which helps the flow of water to the water conveying pipeline and avoids the occurrence of water blockage at the water outlet joint 31, thereby ensuring the flow of water from the adapter box 3 to the evaporation box 4, and ensuring the supply of water, thereby realizing the humidification of the food materials during cooking.

[0051] Moreover, the protruding structures will disturb the flow of water, causing the boundary layer of the water to separate when flowing through the protruding structures, forming turbulent flow and vortex flow. That is, upstream of the protruding structures, the boundary layer of the water may adhere to the inner wall surface of the water outlet joint 31, but downstream of the protruding structures, the adhesion performance between the water and the water outlet joint 31 decreases, and the boundary layer separates, providing a channel for air return, ensuring the air supply in the water tank 2, and enabling the water in the water tank 2 to be supplied to the evaporation box 4.

[0052] It should be noted that the structure of the machine body is not limited, and any one of the following embodiments can be used:

[0053] Embodiment one: the machine body includes a base provided with a cooking cavity, and a machine head for opening or covering the cooking cavity. The base is provided with a removable fryer basket, and the food materials are placed in the fryer basket for cooking. In one embodiment, the machine head and the base can be pivotally connected to open or cover the cooking cavity by turning the machine head. In another embodiment, the machine head and the base are connected in a split type, i.e. the machine head can be removed from the base to open or cover the cooking cavity.

[0054] As an embodiment of the present embodiment, the water tank, the adapter box and the evaporation box are all arranged on the machine head. Preferably, the height of the position of the water tank on the machine head is higher than the height of the position of the evaporation box on the machine head, so that the water supply from the water tank to the evaporation box can not only realize automatic water supply by means of the communicating vessel principle, but also can realize water supply by means of the self-weight of the water due to the higher position of the water tank. Further, the machine head is provided with a hot air assembly for conveying hot air into the cooking cavity, and the hot air assembly includes a fan and a heating tube. The evaporation box is attached to the heating tube to heat the water in the evaporation box by the heating tube, realize the vaporization of the water, and blow the water vapor into the cooking cavity by the action of the fan to achieve the tender roasting effect of the food materials.

[0055] In another embodiment of this implementation, the water tank, the adapter box, and the evaporation box are all located on the base, and the base is also provided with a heating unit for heating the water in the evaporation box to vaporize it.

[0056] Implementation Method Two: (e.g.) Figure 1 As shown, the machine body in this second embodiment includes a body with an internal receiving cavity and a drawer assembly that can be pulled out and placed from the receiving cavity. The drawer assembly contains a cooking cavity 13. The body includes an integrally fixed head 12 and a base 11. The water tank 2, the adapter box 3, and the evaporation box 4 are all located on the head 12 and above the receiving cavity. The head 12 contains a hot air assembly for delivering hot air into the cooking cavity 13. The hot air assembly includes a fan 16 and a heating element 15. The evaporation box 4 is in close contact with the heating element 15 for heat transfer, so that the water in the evaporation box 4 is heated by the heating element 15 to achieve water vaporization. The steam is blown into the cooking cavity by the fan 16 to achieve a tender roasting effect for the food.

[0057] The protruding structure in this application can be constructed using any of the following embodiments:

[0058] Implementation Method 3: For example Figure 3 and Figure 4 As shown, the protruding structure is a rib 311 extending from the inlet end of the water outlet connector 31 to the outlet end, and a recessed channel is formed between two adjacent protruding structures.

[0059] In this embodiment, the protruding structure is a rib 311, and the rib 311 extends from the water inlet end of the water outlet connector 31 to the water outlet end, realizing the continuous arrangement of the rib 311. Thus, a complete channel can be formed between two adjacent ribs 311. The existence of the channel can effectively guide the outside air to flow into the water tank 2, thereby realizing the fluid communication between the water tank 2 and the evaporation box 4, so that the water in the water tank 2 can be smoothly supplied to the evaporation box 4. On the other hand, it can disperse the water flow, reduce the water flow impact noise, thereby reducing noise pollution. Furthermore, it can also reduce the water's adhesion to the wall, thereby reducing the occurrence of water blockage.

[0060] As a preferred embodiment of this third implementation method, such as Figure 3 and Figure 4As shown, the protruding rib 311 includes a fixed end fixed to the inner wall surface of the water outlet joint 31, and a free end extending towards the center of the water outlet joint 31, and the thickness of the protruding rib 311 gradually decreases from the fixed end to the free end to form a turbulence tooth. In this embodiment, the gradual change of the thickness of the protruding rib 311 from the fixed end to the free end forms a turbulence tooth, which, when water flows through the turbulence tooth, on the one hand, causes disturbance of the water flow, increases the turbulence of the water, reduces the wall adhesion ability of the water in the water outlet joint 31, provides a path for aeration, on the other hand, the turbulence tooth can destroy the surface tension of the water flow, prevent the water column from being blocked in the water outlet joint 31 and unable to flow to the water delivery pipeline, and further, the existence of the turbulence tooth can also break the bubbles to avoid excessive bubbles to block the water outlet joint 31.

[0061] It should be noted that the third embodiment does not limit the extension direction of the protruding rib 311. In one embodiment, as shown in Figure 3 the protruding rib 311 extends in a straight line from the water inlet end to the water outlet end of the water outlet joint 31, that is, the extension direction of the protruding rib 311 is parallel to the axial direction of the water outlet joint 31, so as to form a channel penetrating from top to bottom between the adjacent two protruding ribs 311. In another embodiment, the protruding rib extends in a winding manner from the water inlet end to the water outlet end of the water outlet joint, for example, extends in a spiral manner, so as to form a spiral channel between the adjacent two protruding ribs, so as to further improve the disturbance in the water flow process, reduce the wall adhesion performance thereof at the water outlet joint, and avoid water blocking phenomenon at the water outlet joint.

[0062] The fourth embodiment is not shown, in which the protruding structure is a plurality of convexes distributed on the inner wall of the water outlet joint. When water flows and encounters the convex, a small and strong vortex flow is generated, thereby reducing the wall adhesion performance of the water and avoiding the water being trapped at the water outlet joint.

[0063] As shown in Figure 2 the water delivery pipeline has a water outlet section extending into the evaporation box 4, and a water replenishment gap exists between the bottom end of the water outlet section and the bottom wall of the evaporation box 4. The water tank 2 and the evaporation box 4 constitute a communicating vessel, when the liquid level in the evaporation box 4 is lower than the bottom end of the water outlet section, air is supplied to the water tank 2 through the water delivery pipeline, and the water tank 2 starts to automatically replenish water to the evaporation box 4, and when the liquid level submerges the bottom end of the water outlet section, the communicating vessel is isolated from air, and the water tank 2 automatically stops replenishing water.

[0064] Preferably, the height H of the water replenishment gap satisfies: 3mm≤H≤10mm. For example, H is 3mm, 5mm, 8mm, or 10mm. By optimizing the height of the water replenishment gap, on the one hand, the probability of water blocking the water outlet section due to tension can be further reduced, and smooth aeration can be achieved; on the other hand, the water outlet amount and the water outlet efficiency can be further balanced, and the problem of requiring a large amount of water to be stored in the evaporation box 4 to stop water replenishment due to the height being too high, thereby requiring more heat to make the water in the evaporation box 4 boil, thereby reducing the steam outlet efficiency, can be avoided.

[0065] Preferably, as shown in Figure 6 , the side wall of the water outlet section is provided with an air supplement port 61. The air supplement port 61 can be provided so that the bottom end of the water outlet section does not need to be completely exposed, and air can enter the water supply pipeline through the air supplement port 61 and then enter the inside of the water tank 2, so that the water tank 2 starts to automatically replenish water, improves the timeliness of water replenishment, avoids the decline in cooking effect caused by short-term water shortage, and ensures the tender roasting effect of the food material. In addition, the air supplement port 61 also destroys the regular shape of the water outlet section, which can prevent the occurrence of water blocking caused by the stagnation of the water column in the water outlet section.

[0066] In one example, the air supplement port is a hole structure provided on the side wall of the water outlet section, that is, the lower edge of the hole structure is a certain distance from the bottom end surface of the water outlet section. In another example, as shown in Figure 6 , the bottom end of the water outlet section is locally recessed upward to form an air supplement port 61, that is, the air supplement port 61 is a notch structure provided on the side wall of the water outlet section. Further, the height of the air supplement port 61 is greater than or equal to 3mm, so as to further improve the water replenishment efficiency and the air supplement efficiency, and further compatible with the steam generation efficiency.

[0067] The connection relationship between the water tank and the machine body in the present application can adopt any one of the following embodiments:

[0068] Embodiment five: the water tank can be taken out and placed from the machine body. As shown in Figure 3 and Figure 4 , the water outlet of the water tank 2 is provided with a drain valve, and the adapter box 3 is provided with a trigger portion 32 upstream of the water outlet connector 31 for pushing the drain valve to move to open the water outlet. In the fifth embodiment, the provision of the drain valve at the water outlet of the water tank 2 provides protection against water leakage during the process of inverting and taking out the water tank 2, and the removable setting of the water tank 2 facilitates the user to thoroughly clean the water tank 2 and replenish water in the water tank 2. By providing the trigger portion 32 capable of pushing the drain valve to move upstream of the water outlet connector 31 of the adapter box 3, the water tank 2 can be assembled to the air fryer, and the water outlet can be opened through the cooperation of the trigger portion 32 and the drain valve, the whole operation is convenient and fast, and no additional operation is required, thereby improving the user experience.

[0069] The fifth embodiment does not limit the setting position of the trigger part 32, which can adopt any of the following examples:

[0070] Example 1: The trigger part is located at the inner circumferential side of the water inlet end of the water outlet connector, and there is a gap between the trigger part and the inner wall of the water outlet connector for fluid to pass through.

[0071] Example 2: As shown in Figure 3 and Figure 4 , the trigger part 32 is located at the circumferential outer side of the water inlet end of the water outlet connector 31. Due to the setting of the protruding structure, the inner diameter of the water outlet connector 31 has already been reduced. By setting the trigger part 32 at the circumferential outer side of the water inlet end of the water outlet connector 31, the space inside the water outlet connector 31 can be avoided by the trigger part 32, ensuring the flow area of water at the water outlet connector 31, and further reducing the probability of water blockage at the water outlet connector 31.

[0072] In this embodiment 2, the structure of the trigger part 32 can adopt any of the following examples:

[0073] Example 1: The trigger part is a ring structure arranged around the water outlet connector, and the trigger part is provided with a flow passage communicating the water outlet and the water outlet connector.

[0074] Example 2: As shown in Figure 4 , the trigger part 32 is provided with a plurality of trigger parts 32, which are arranged around the water inlet end of the water outlet connector 31, and the plurality of trigger parts 32 form a flow passage communicating the water outlet and the water outlet connector 31.

[0075] Whether it is example 1 or example 2, the arrangement of the flow passage not only provides a path for water to flow from the water tank 2 to the water outlet connector 31, but also provides a path for air to supplement from the water outlet connector 31 to the water tank 2. Moreover, whether the trigger part 32 is set as a ring structure arranged around the water outlet connector 31 or the trigger part 32 is arranged as a plurality of trigger parts around the water inlet end of the water outlet connector 31, the water flow can be disturbed to form a vortex at the water inlet end of the water outlet connector 31, optimize the water flow field, avoid water blockage at the water outlet connector 31, and ensure smooth water supply from the water tank 2 to the evaporative box 4.

[0076] As a preferred embodiment of the fifth embodiment, as shown in Figure 3 , the drain valve includes a movable rod 21 and a sealing pad 22 arranged at one end of the movable rod 21. The water outlet of the water tank 2 is provided with a mounting plate 23 for mounting the movable rod 21. The mounting plate 23 is provided with a plurality of through water holes 24. The movable rod 21 drives the sealing pad 22 to move to open or block the water holes 24.

[0077] The sealing gasket 22 at one end of the movable rod 21 can effectively seal the water outlet of the water tank 2, preventing water leakage when the water tank 2 is taken out, moved, and improving the sealing performance of the drain valve. The water outlet of the water tank 2 is provided with a mounting plate 23. The mounting plate 23 not only provides a mounting position for the movable rod 21, but also ensures that the movable rod 21 moves in the predetermined direction, ensuring that the water outlet is normally opened and closed. In addition, the mounting plate 23 is provided with a plurality of water passing holes 24 that communicate the inner cavity of the water tank 2 with the water outlet connector 31. The water passing holes 24 can limit the speed of the water flow, ensure the smooth discharge of the water flow, avoid the water hammer effect and noise caused by the water flow being too fast, and at the same time, the water passing holes 24 can also realize the dispersed flow of water, so as to affect the flow path and speed distribution of the water, and then affect the wall adhesion ability of the water, thereby reducing the probability of water blockage at the water outlet of the water tank 2. In addition, the water passing holes 24 can cause changes in the cross-sectional area of the fluid flow path, thereby helping to achieve bubble breaking and reducing the probability of bubble blockage at the water outlet of the water tank 2, thereby achieving smooth water replenishment. In addition, the plurality of water passing holes 24 provide multiple channels for air to enter the water tank 2, facilitating automatic water replenishment of the water tank 2 to the evaporation box 4.

[0078] Further, as shown in Figure 3 The movable rod 21 includes a linkage rod 211 and a pushing portion 212 provided at the end of the linkage rod 211. The trigger portion 32 acts on the pushing portion 212 to drive the sealing gasket 22 to move upward through the linkage rod 211 to open the water outlet of the water tank 2. The linkage rod 211 is provided with an elastic reset member 213, for example, a spring. The elastic reset member 213 is located between the pushing portion 212 and the mounting plate 23. In the state that the water outlet of the water tank 2 is opened, the elastic reset member 213 is in a compressed state. When the water tank 2 is removed from the body 1, the pushing portion 212 is separated from the trigger portion 32, and the pushing portion 212 moves under the action of the elastic force of the elastic reset member 213 to drive the sealing gasket 22 to move downward through the linkage rod 211 to close the water outlet of the water tank 2, thereby preventing water leakage.

[0079] Embodiment six: this embodiment is not shown in the figure. In this embodiment, the water tank is fixedly installed on the body, and the water tank is provided with a water replenishment opening for the user to replenish water to the water tank through the water replenishment opening.

[0080] The configuration of the adapter box is not limited in the present application. In one embodiment, the adapter box is integrally formed with the body. In another embodiment, the adapter box 3 is separately formed with the body 1 and then assembled together. Whether integrally formed or separately formed, as shown in Figure 4 The adapter box 3 is formed with an adapter cavity 33 adapted to the water tank 2. The inner wall of the adapter cavity 33 is in sealing cooperation with the outer side wall of the water tank 2, so that the water tank 2 and the evaporation box 4 form a single communicating vessel. The source of air during the water replenishment of the water tank 2 comes from the downstream end of the water conveying pipeline.

[0081] The water supply pipeline in this application can adopt any of the following embodiments:

[0082] Implementation Method 7: This implementation method is not illustrated. In this implementation method 7, there is one water supply pipeline. The upstream end of the water supply pipeline is connected to the water outlet of the adapter box, and the downstream end of the water supply pipeline is connected to the evaporation box.

[0083] Implementation method eight: such as Figure 1 As shown, the water supply pipeline includes a first pipeline 5 located at one end of the water outlet connector 31 and a second pipeline 6 located at one end of the evaporation box 4. The materials of the pipe walls of the first pipeline 5 and the second pipeline 6 are different.

[0084] In this embodiment, the walls of the first pipe 5 and the second pipe 6 are made of different materials. Due to the different toughness, surface roughness, and tension of the pipes made of different materials, the flow characteristics of water change when it flows through the first pipe 5 and the second pipe 6, including flow velocity distribution and pressure loss. These changes cause changes in the adhesion properties and surface tension of water within the first pipe 5 and the second pipe 6. At the connection point of the first pipe 5 and the second pipe 6, this facilitates the separation of water from the pipe wall, making it easier to replenish air and preventing water blockage. Moreover, by utilizing the different properties of the different materials, different functions can be achieved, such as sealing performance and temperature resistance.

[0085] Taking a first pipe 5 as a plastic or silicone pipe and a second pipe 6 as a metal pipe as an example: Plastic or silicone pipes typically have good flexibility, chemical resistance, and low surface tension. These characteristics make water have a relatively strong ability to adhere to the pipe walls when flowing through them. Furthermore, the inner walls of plastic or silicone pipes are usually smooth, which helps reduce frictional resistance during water flow, thus improving water adhesion. In addition, the low surface tension and good wettability of silicone pipes also contribute to water adhesion. Metal pipes, on the other hand, typically have higher rigidity and wear resistance, but their surface characteristics are fundamentally different from those of plastic and silicone pipes. The surface of metal pipes may be relatively rough, which increases frictional resistance during water flow, potentially reducing water adhesion. Moreover, metal pipes have higher chemical inertness and do not have the same good wettability as plastic and silicone pipes, further reducing water adhesion. As water flows from the plastic or silicone pipe to the metal pipe, the adhesion properties between the water and the inner wall of the pipe change, facilitating water separation from the pipe wall, making air replenishment easier, and preventing water blockage.

[0086] As a preferred embodiment of this implementation method eight, such as Figure 1 , Figure 5 and Figure 6As shown, the air fryer further comprises a reflecting cover 14 arranged on the body 1, a cooking cavity 13 is formed below the reflecting cover 14, a hot air assembly is arranged in the cooking cavity 13, the water tank 2 is arranged outside the cooking cavity 13, the evaporation box 4 is arranged in the cooking cavity 13, the first pipeline 5 is a plastic pipe or a silica gel pipe, the second pipeline 6 is a metal pipe, the reflecting cover 14 is provided with a through hole through which the first pipeline 5 passes, the first pipeline 5 is in interference fit with the through hole, and one end of the second pipeline 6 is inserted into the first pipeline 5. The hot air assembly comprises a fan 16 and a heating pipe 15, preferably, the bottom of the evaporation box 4 is tightly attached to the heating pipe 15 so as to heat the water in the evaporation box 4 through the heating pipe 15.

[0087] In the embodiment, the evaporation box 4 is arranged in the cooking cavity 13, when there is no water in the water tank 2, the evaporation box 4 has a risk of being dry-burned, thereby causing the temperature of the evaporation box 4 to rise, the metal pipe is used as the second pipeline 6 and connected to the evaporation box 4, even if the phenomenon of dry-burning of the evaporation box 4 occurs during the operation of the air fryer, because the metal pipe has good temperature resistance, the transition of the metal pipe can be borrowed to reduce the working temperature of the first pipeline 5 and prolong the service life of the first pipeline 5, thereby ensuring the stability and reliability of the humidifying operation. The first pipeline 5 is a plastic pipe or a silica gel pipe, the reflecting cover 14 is provided with a through hole through which the first pipeline 5 passes, the first pipeline 5 is in interference fit with the through hole, by means of the elastic property of the first pipeline 5 itself, the first pipeline 5 realizes sealing of the position of the through hole of the reflecting cover 14, thereby saving the need to separately add a sealing member, which not only reduces the cost but also ensures the sealing performance of the through hole, avoids leakage of hot air in the cooking cavity 13 from the through hole, and guarantees the heat efficiency in the cooking cavity 13. In addition, the interference fit of the first pipeline 5 with the through hole of the reflecting cover 14 also provides positioning for the first pipeline 5, which ensures that the first pipeline 5 is not easy to be displaced during the insertion of the first pipeline 5 and the second pipeline 6, which not only helps to improve the assembly efficiency between the two, but also helps to keep the second pipeline 6 in the preset installation position after installation, and ensures that the relative positional relationship between the second pipeline 6 and the evaporation box 4 is not easy to be changed.

[0088] As a preferred embodiment of the present application, as Figure 1 、 Figure 5As shown, the air fryer further comprises a reflecting cover 14 arranged on the body 1, and a cooking cavity 13 is formed below the reflecting cover 14, and a hot air assembly is arranged in the cooking cavity 13, and the water tank 2 is arranged outside the cooking cavity 13, and the evaporation box 4 is arranged in the cooking cavity 13, and the evaporation box 4 is open at the top and is hung on the reflecting cover 14 to form a flow gap between the top of the evaporation box 4 and the reflecting cover 14. An air inlet 41 is formed on the side wall of the evaporation box 4 close to the hot air assembly, and an air outlet 42 is arranged on the side wall adjacent to the side wall. The existence of the air inlet 41, the air outlet 42 and the flow gap can blow the hot steam generated in the evaporation box 4 into the cooking cavity 13 by the wind power of the fan 16, so as to avoid the phenomenon of difficult water replenishment of the water tank 2 caused by the sudden increase of the pressure in the evaporation box 4 due to the accumulation of steam in the evaporation box 4.

[0089] Preferably, as shown in the drawings, Figure 2 The distance h between the lower edge of the air inlet 41 and the lower port of the water outlet end of the water conveying pipeline satisfies: h≥8mm. In this way, when the air fryer is placed on an uneven table or the water in the evaporation box 4 is heated and boiled to overflow, the probability of the water overflowing into the cooking cavity 13 to soak the food can be reduced.

[0090] As a preferred embodiment of the present application, as shown in the drawings, Figure 1 The water outlet joint 31 of the evaporation box 4 and the adapter box 3 are at least partially misaligned in the horizontal direction, so that the water conveying pipeline is bent in multiple ways along the flow path of the water, and the curved water conveying pipeline also affects the flow path and speed distribution of the water, thereby affecting the wall adhesion ability of the water and reducing the probability of water being trapped in the water conveying pipeline and causing water blockage.

[0091] The parts not described in the present application can be realized by using or referring to the existing technology.

[0092] Each embodiment in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the differences from other embodiments.

[0093] The above only describes the embodiments of the present application and does not limit the present application. The technical features or structures in the foregoing different embodiments can be combined as needed to form other specific technical solutions. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An air fryer comprising a steam generating assembly and a body with a cooking cavity, the steam generating assembly delivering steam into the cooking cavity, characterized in that, The steam generating assembly comprises a water tank, an adapter box for mounting the water tank, an evaporation box, and a water delivery pipeline connecting the adapter box and the evaporation box, the water tank and the evaporation box form a communicating vessel, water in the water tank flows into the evaporation box through the adapter box and the water delivery pipeline in sequence, and is evaporated in the evaporation box to form steam, the adapter box is connected with the water delivery pipeline through a water outlet joint, and the inner wall of the water outlet joint is provided with a plurality of protruding structures.

2. The air fryer according to claim 1, wherein The protruding structure is a protruding rib extending from the water inlet end to the water outlet end of the water outlet joint, and a recessed channel is formed between adjacent two protruding structures.

3. The air fryer according to claim 2, wherein The protruding rib comprises a fixed end fixedly connected with the inner wall surface of the water outlet joint, and a free end extending towards the center of the water outlet joint, the thickness of the protruding rib gradually decreases from the fixed end to the free end to form a turbulence tooth.

4. The air fryer according to claim 1, wherein The water delivery pipeline has a water outlet section extending into the evaporation box, a water supplement gap is formed between the bottom end of the water outlet section and the bottom wall of the evaporation box, and the bottom end of the water outlet section is locally concave upwards to form an air supplement port.

5. The air fryer according to claim 4, wherein The height H of the water supplement gap satisfies 3mm≤H≤10mm.

6. The air fryer according to claim 1, wherein A drain valve is arranged at the water outlet of the water tank, a trigger part for pushing the drain valve to move to open the water outlet is arranged at the upstream of the water outlet joint, and the trigger part is located on the circumferential outer side of the water inlet end of the water outlet joint.

7. The air fryer according to claim 6, wherein The trigger part is an annular structure arranged around the water outlet joint, and the trigger part is provided with a flow passage connecting the water outlet and the water outlet joint; Alternatively, a plurality of trigger parts are arranged around the water inlet end of the water outlet joint, and a flow passage connecting the water outlet and the water outlet joint is formed between the plurality of trigger parts.

8. The air fryer according to claim 6, wherein The drain valve comprises a movable rod and a sealing gasket arranged at one end of the movable rod, the water outlet of the water tank is provided with a mounting plate for mounting the movable rod, a plurality of through water holes are arranged at the mounting plate, and the movable rod drives the sealing gasket to move to open or block the water holes.

9. The air fryer according to claim 1, wherein The water delivery pipeline comprises a first pipeline at one end of the water outlet joint and a second pipeline at one end of the evaporation box, and the pipe wall of the first pipeline and the second pipeline is made of different materials.

10. The air fryer according to claim 9, wherein The air fryer further comprises a reflecting cover arranged on the machine body, a cooking cavity is formed below the reflecting cover, a hot air assembly is arranged in the cooking cavity, the water tank is arranged outside the cooking cavity, the evaporation box is arranged in the cooking cavity, the first pipeline is a plastic tube or a silica gel tube, the second pipeline is a metal tube, the reflecting cover is provided with a through hole through which the first pipeline passes, the first pipeline is in interference fit with the through hole, and one end of the second pipeline is inserted into the first pipeline.

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