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EP-4736713-A1 - A DUAL-BASKET AIR FRYER WITH TOP AND BOTTOM BACK-BLOWING

EP4736713A1EP 4736713 A1EP4736713 A1EP 4736713A1EP-4736713-A1

Abstract

The present invention relates to a dual-basket air fryer that features top and bottom back-blowing, which aims at addressing a drastic temperature disparity between the upper and lower chambers of these products and similar models poses challenges in simultaneously processing and cooking food that requires high temperatures. An essential aspect of the structural design is the increased height of the thermal barrier at the top of both chambers, which transitions from the front opening to the rear section, just like a curved surface. Additionally, the thermal barrier above the basket openings in both chambers is designed with a cap edge that extends over the openings. The thermal barrier surrounding the air blades is integrated with the top thermal barrier, forming a cohesive thermal barrier corresponding to the openings on one side of the appliance. Notably, the cap edge at the lower basket opening is positioned away from the top thermal barrier, resulting in a curved gap between the back of the top thermal barrier and the lower basket opening. The upper section of the lined metal thermal barrier located at the rear of the specified gap is equipped with air outlet openings, while the lower section of the lined metal thermal barrier at the back of the same gap features air inlet openings. The air inlet holes align with honeycomb openings at the front end of the back of the basket body.

Inventors

  • LOU, Hongxian
  • ZANG, Hao
  • Zhou, Licong
  • FU, ZHI

Assignees

  • Zhejiang Biyi Electric Appliance Co., Ltd.

Dates

Publication Date
20260506
Application Date
20250427

Claims (12)

  1. A dual-basket air fryer designed with top and bottom back-blowing features a dual-layer structure, comprising an upper and a lower chamber, a rear section of the appliance being equipped with air blades (13, 17), while the upper and the lower chamber are fitted with heating tubes (3,8), each chamber including a basket opening for placing a basket (5, 10) on one side, a thermal barrier (2, 7) being provided at the top of the lower and upper chamber respectively, running from the basket opening to a rear section in the form of a curved surface, the thermal barrier (2, 7) above the basket openings in both chambers being provided with a cap edge extending over the basket openings, a thermal barrier surrounding the air blades being integrated with the top thermal barrier, forming a cohesive thermal barrier corresponding to the openings on one side of the appliance, the cap edge at the lower basket opening is positioned away from the top thermal barrier (2), resulting in a curved gap between the back of the top thermal barrier and the lower basket opening, the upper section of the lined metal thermal barrier located at the rear of the specified gap is equipped with air outlet openings, while the lower section of the lined metal thermal barrier at the back of the same gap features air inlet openings, the air inlet holes align with honeycomb openings at the front end of the back of the basket body (5, 10), which is equipped with air inlet and outlet holes.
  2. An air fryer with top and bottom back-blowing according to Claim 1, wherein the basket body (5, 10) features a front end that exhibits symmetrical distribution on the opposite side of the inner wall, characterized by evenly spaced raised guide bars, the guide bars being either formed through integrated stamping with the basket body (5, 10) or being positioned within a guide bar that is affixed to the inner wall of the basket body (5, 10).
  3. An air fryer with top and bottom back-blowing according to Claim 1 or 2, wherein the said blades consist of plastic centrifugal wind blades (13) and metal centrifugal wind blades (12, 17), said blades being simultaneously positioned within the airflow guide cover located at the rear of the upper and lower chambers, wherein motor shafts situated at the back of the airflow guide cover are connected to the plastic (13) and metal centrifugal wind blades (12, 17) in the respective upper and lower chambers and the peripheral surfaces of the airflow guide cover associated with the plastic centrifugal wind blade (13) featuring perforated holes, while the wind cover linked to the metal centrifugal wind blade is connected to the inner chamber of the plastic centrifugal wind blade via back thru-holes, the airflow guide of the metal centrifugal blade being linked to the inner chamber of the airflow guide of the plastic centrifugal blade through a back thru-hole.
  4. An air fryer with top and bottom back-blowing according to Claim 3, wherein the airflow guide cover associated with the plastic centrifugal blade (13) is constructed from plastic, while the airflow guide cover for the metal centrifugal blade (12, 17) is made from metal materials.
  5. An air fryer with top and bottom back-blowing according to any of the preceding Claims, the upper and lower chambers being separated by a partition located in the rear section of the upper chamber, which houses a power board assembly (15) and an external power cord, the power board assembly (15) being positioned above the top corner of the body, along with PCB control components (1), motors (14, 16), and heat pipes, all of which are connected to the power board assembly (15) via wiring.
  6. An air fryer with top and bottom back-blowing according to Claim 5, wherein the outer edge of the upper handle (4) is aligned vertically or diagonally with the outer edge of the lower handle (9) situated below it.
  7. An air fryer with top and bottom back-blowing according to any of the preceding Claims, wherein the upper and lower chambers are equipped with NTC temperature sensors (22) located on the reverse side of the top layer of thermal barrier at the heating tube, the NTC temperature sensors (22) being connected to the power board assembly (15) within the body via respective wiring.
  8. An air fryer with top and bottom back-blowing according to any of the preceding Claims, wherein the cold air system of the air fryer comprises a body, a plastic partition (21), a base (19), a metal liner (23, 26), and a frying basket liner (24, 25), the metal liner (23, 26) serving as the thermal barrier, while the base (19) is positioned within the stand of the bottom of the body, the outer diameters of the metal liner (23, 26) in the upper and lower chambers forming a primary cold air cavity between the inner diameters of the metal liner (23, 26) and the body, as well as the base (19), the primary cold air cavity being further divided into upper and lower main cold air chambers by the plastic partition (21), the outer diameters of the frying basket liner (24, 25) in both chambers being connected a the power board assembly (15) within the body through wiring, the spaces between the outer diameter of the basket liner (24, 25) and the inner diameter of the basket cover forming the upper and lower subsidiary air cooling cavities, the upper and lower edges of the basket cover featuring thru-holes that connect to the base (19) of the body below the openings, while the openings in the body are situated above the metal liner at the upper edge of the holes, air outlets being positioned on the body at the top and bottom of the plastic divider, and notches (32) being present on both sides of the edges of the plastic divider openings on the body.
  9. An air fryer with top and bottom back-blowing according to Claim 8, wherein the base (19) is designed with evenly spaced openings located at the bottom or on both sides, which serve as air inlets.
  10. An air fryer with top and bottom back-blowing according to Claim 8, wherein there exists a recessed groove at the top front end of the said body and above the opening side, and a beveled edge is incorporated into the metal liner of the body beneath this groove, a control box (20) being situated within the groove.
  11. An air fryer with top and bottom back-blowing according to any of the preceding Claims, wherein the control box (20) is positioned at the upper front end, situated above the opening side of the body, the control box (20) containing PCB control components and being connected to a housing bracket (36) via a hinged mechanism, specifically through a control box bracket (32), the hinge mechanism being equipped with a suspension hinge (40), the suspension hinge (40) comprising nuts (33), screws (37), and various anti-slip spacers, including a first anti-slip spacer (35) A, anti-slip spacer (36) B, anti-slip spacer (38) C, and a second anti-slip spacer (39) A, the screws (37) being symmetrically arranged on both the control box bracket (32) and the hinge connection of the housing bracket (36), the lugs at each end of the hinge joint between the control box bracket (32) and the housing bracket (36) facilitating the connection of the screws (37) to the nuts (33) through these brackets, anti-slip spacer (38) C being positioned between the control box bracket (32) and the housing bracket (36) at one end of the connection, along with the first anti-slip spacer 35, anti-slip spacer (36) B, and the second anti-slip spacer (39) A, preferable at least two or more anti-slip spacers (36) B being placed between the first and second anti-slip spacers (35, 39) A.
  12. An air fryer with top and bottom back-blowing according to Claim 11, wherein the said control box (20) is freely suspended within a range of 0 to 60 degrees via the suspension hinge.

Description

FIELD OF TECHNOLOGY The present invention relates to an air fryer, specifically a dual-basket air fryer that features top and bottom back-blowing. BACKGROUND OF THE INVENTION Air fryer is a new household appliance for food frying by using high-speed air circulation, the food cooked by air fryer can reduce 80% of the oil and fat compared to traditional electric fryer. Air fryer is also easy to clean and its safety feature and affordable cost are highly favored. To enhance the efficiency of air fryers, certain models are designed with dual baskets positioned both above and below, or on the left and right sides. For instance, the Chinese patent application No. 202222461172.1, published on March 3, 2023, describes a present invention titled "A double-chamber air fryer without blades". Additionally, other double-layer air fryers feature a heating tube and air blades located at the top of the upper layer, along with another heating tube and air blade situated at the rear of the lower layer, as detailed in Chinese patent Application No. 202322669357.6, with an authorized publication date of April 26, 2024, titled "A double-layer air fryer". Furthermore, some models incorporate a wind blade at the rear of the upper layer and a heating tube with an additional wind blade at the rear of the lower layer, as indicated in Chinese patent Application No. 202210285610.5, published on June 17, 2022, titled "A double-layer structure of air fryer." Moreover, there are double-layer air fryers that include a wind blade at the rear of both the upper and lower layers, along with a heating tube located in the base, as described in Application No. 202411085930.1, published on August 8, 2024, titled "An air fryer." However, a drastic temperature disparity between the upper and lower chambers of these products and similar models poses challenges in simultaneously processing and cooking food that requires high temperatures. SUMMARY OF THE INVENTION To address the aforementioned deficiencies, the present invention aims to release a dual-basket air fryer featuring both top and bottom back-blowing to the market. This innovation addresses the technical challenge associated with drastic temperature discrepancies between the upper and lower chambers of conventional dual-basket air fryers. Such discrepancies complicate the simultaneous processing and cooking of food that demands high temperatures, ultimately leading to unsatisfactory cooking and processing outcomes. The object is accomplished through the implementation of the following technical solution. A dual-basket air fryer designed with top and bottom back-blowing features a dual-layer structure, comprising upper and lower chambers. The rear section of the appliance is equipped with air blades, while the upper and lower chambers are fitted with heating tubes. Each chamber includes openings for placing basket on one side. An essential aspect of the structural design is the increased height of the thermal barrier at the top of both chambers, which transitions from the front opening to the rear section, just like a curved surface. Additionally, the thermal barrier above the basket openings in both chambers is designed with a cap edge that extends over the openings. The thermal barrier surrounding the air blades is integrated with the top thermal barrier, forming a cohesive thermal barrier corresponding to the openings on one side of the appliance. Notably, the cap edge at the lower basket opening is positioned away from the top thermal barrier, resulting in a curved gap between the back of the top thermal barrier and the lower basket opening. The upper section of the lined metal thermal barrier located at the rear of the specified gap is equipped with air outlet openings, while the lower section of the lined metal thermal barrier at the back of the same gap features air inlet openings. The air inlet holes align with honeycomb openings at the front end of the back of the basket body. The body is equipped with air inlet and outlet holes. Thereby, the upper and lower baskets employ a back-blowing technique, in which air is drawn from the center of the centrifugal air blades. This air is then directed towards the heating tube through a thermal barrier. The heated air is channeled downward along this thermal barrier to the handle area of the body. From there, it is expelled from the handle end towards the front of the body, passing through the honeycomb openings at the front before ultimately being recirculated back to the center of the centrifugal air blades. The basket body features a front end that exhibits symmetrical distribution on the opposite side of the inner wall, characterized by evenly spaced raised guide bars. The said guide bars are either formed through integrated stamping with the basket body or are positioned within a guide bar that is affixed to the inner wall of the basket body. This design enhances the circulation of hot air within the basket body. The said blades consist of