A two-in-one heater

Abstract

This utility model relates to a two-in-one heater, addressing the technical problem that existing similar electric heating tube structures rarely employ annular tubular structures with upper and lower layers, resulting in large space occupation and difficulty in achieving optimal steaming and baking performance. The heating tube has an annular dry-burning tube, with the terminals at both ends bent and fixed to a first support. A steam pipe corresponds in shape to the dry-burning tube and is positioned on the outer diameter of the dry-burning tube. The steam pipe is connected to a water tank, water pump, and steam generator via the first support. The key feature is that the steam pipe is positioned between at least two annular dry-burning tubes, fitting snugly against the outer diameter of both tubes. One end of the steam pipe is connected to a pipeline via the first support, while the other end is bent downwards towards the lower part of the pot. The steam pipe's opening and diameter are square, and the outer diameter of the dry-burning tube fitting the steam pipe is a flat key surface. The dry-burning tube and steam pipe are positioned within a groove in the metal insulation layer, outside the metal centrifugal fan blades.

Description

Technical Field

[0001] This utility model relates to an electric heating element with steam function, specifically a two-in-one heater. Background Technology

[0002] Tubular heating elements, also known as heating tubes or dry-burning tubes, are electrical components that convert electrical energy into heat energy. They typically have a metal tube as the outer shell (including stainless steel and copper tubes), with spiral heating alloy wires (nickel-chromium or iron-chromium alloy) evenly distributed along the central axis inside the tube. The gaps are filled with compacted magnesium oxide sand, which has good insulation and thermal conductivity. The ends of the tube are sealed with silicone and have wiring terminals. Heating tubes are one of the main components in existing household appliances such as air fryers. Air fryers are a new type of household appliance that uses high-speed air circulation technology to fry food. Food cooked in air fryers can have 80% less oil than food cooked in traditional fryers, is easy to clean in daily use, and is both safe and economical, making it very popular. Currently, the steaming and baking systems of steam air fryers are usually two separate systems: the baking system includes a motor, fan, and dry-burning tube; the steaming system includes a water tank, water pump, and steam generator. Integrating these two systems into one air fryer greatly limits the product design, resulting in suboptimal steaming and baking performance. Western dietary habits primarily involve baking, with steaming as a secondary method; while domestic dietary habits primarily involve steaming, with baking as a secondary method. To better suit both domestic and international users, there is an urgent need to develop a system with strong steam and air-frying performance. Some existing air fryers have steam functions and employ a steam pipe structure at the dry-heating tube; for example, Chinese patent application number 202120803430.2, authorized on February 18, 2022, entitled "A Novel Steam Air Fryer with Good Heating Performance"; and another example, Chinese patent application number 202221090530.6, authorized on October 14, 2022, entitled "A Novel Steam Generating Component and its Steam Air Fryer". However, the heating tubes and steam pipes of the above products and similar products generally adopt a mosquito coil-shaped or disc-shaped structure design, or an inner and outer tube structure design, rarely using a double-layered annular tubular structure design, resulting in a large space occupation. Summary of the Invention

[0003] To overcome the aforementioned shortcomings, the purpose of this utility model is to provide a two-in-one heater that solves the technical problem that existing similar electric heating tube structures rarely adopt annular tubular structures with upper and lower layers, resulting in large space occupation and difficulty in achieving optimal steaming and baking performance. This objective is achieved through the following technical solution.

[0004] A two-in-one heater includes a dry-burning tube and a steam tube. The dry-burning tube is annular, with its ends bent and fixed to a first support. The steam tube corresponds in shape to the dry-burning tube and is positioned on its outer diameter. The steam tube is connected to a water tank, a water pump, and a steam generator via the first support. The steam tube is positioned between at least two annular dry-burning tubes, fitting snugly to their outer diameters. One end of the steam tube is connected to a pipeline via the first support, while the other end is bent downwards towards the lower part of the pot. This structure facilitates the installation and use of the fan blades in the middle of the heating tube, reduces space occupation, and simplifies assembly. An additional layer of heating tubes can also be stacked on top of the upper and lower dry-burning tubes as needed.

[0005] The terminals at both ends of one side of the dry-burning tube are bent and fixed to the first bracket, while the other end of the dry-burning tube, bent into a ring shape, is sealed and connected as a whole by a connector. The connector is a heating wire core or a glass heating tube with a heating wire core, or a similar component.

[0006] The opening and diameter of the steam pipe are square, and the outer diameter of the dry-burning pipe that fits the steam pipe is a flat key surface.

[0007] The dry-burning tube includes a first heating tube and a second heating tube with two layers. The outer diameter of the steam pipe side of the first heating tube is a flat key surface, and the second heating tube is a square tube with flat key surfaces on both sides.

[0008] A second bracket is provided on the outer diameter of the dry-burning pipe and steam pipe on the other side of the first bracket. The dry-burning pipe and steam pipe are fixed in the groove of the metal insulation layer by the first bracket and the second bracket. The dry-burning pipe and steam pipe are set in the groove of the metal insulation layer on the outside of the metal centrifugal fan blade. The middle of the metal centrifugal fan blade is connected to the drive shaft of the motor that extends out of the metal insulation layer. The metal insulation layer is set in the body of the air fryer above the inner pot.

[0009] The top of the groove in the metal insulation layer is provided with a plastic centrifugal fan blade, and the middle of the plastic centrifugal fan blade and the metal centrifugal fan blade are connected to the drive shaft of the motor that extends out of the metal insulation layer.

[0010] An NTC temperature sensor is provided on one side of the outer diameter of the dry-burning pipe and the steam pipe inside the groove of the metal insulation layer.

[0011] This utility model has a simple and reasonable structural design, is easy to produce and assemble, has low manufacturing cost, and has a wide range of applications. In particular, it is convenient to set and use the fan blade in the middle of the heating tube. It is suitable for use as a two-in-one heater for cooking appliances such as air fryers, as well as for structural improvements of similar products. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 A schematic diagram of the bottom structure.

[0014] Figure 3 yes Figure 1 A schematic diagram of the usage state structure.

[0015] Figure 4 yes Figure 3 A partial cross-sectional structural diagram.

[0016] Figure 5 yes Figure 3 A schematic diagram of the internal structure of a dual-cavity air fryer in use.

[0017] Attached figures and their names: 1. Steam pipe, 2. Dry-burning pipe, 201. Connector, 202. First heating pipe, 203. Second heating pipe, 3. First bracket, 4. Second bracket, 5. Metal insulation layer, 6. Metal centrifugal fan blade, 7. Motor, 8. Plastic centrifugal fan blade, 9. NTC temperature sensor. Implementation

[0018] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-5 As shown, the heating element includes a dry-burning tube 2 and a steam tube 1. The dry-burning tube is annular, and the terminals at both ends of the dry-burning tube are bent and fixed to the first bracket 3. The steam tube corresponds to the shape of the dry-burning tube and is located on the outer diameter of the dry-burning tube. The steam tube is connected to the water tank, water pump, and steam generator through the first bracket. The steam tube is located between the upper and lower annular dry-burning tubes and fits against the outer diameter of the upper and lower dry-burning tubes. One end of the steam tube is connected to the pipeline through the first bracket, and the other end of the steam tube is bent downwards and faces the lower pot body. While the terminals at both ends of one side of the dry-burning tube are bent and fixed to the first bracket, the other side of the dry-burning tube, which is bent into annular shape, is sealed and connected as a whole by a connector 201. The opening and diameter of the steam tube are square, and the outer diameter of the dry-burning tube fitted with the steam tube is a flat key surface. Specifically, the above-mentioned dry-burning tube includes an upper and lower first heating tube 202 and a second heating tube 203. The outer diameter of the steam tube on one side of the first heating tube is a flat key surface, and the second heating tube is a square tube with flat key surfaces on both sides.

[0019] A second bracket 4 is provided on the outer diameter of the dry-burning pipe and steam pipe on the opposite side of the first bracket. The dry-burning pipe and steam pipe are fixed in the groove of the metal insulation layer 5 by the first bracket and the second bracket. The dry-burning pipe and steam pipe are located outside the metal centrifugal fan 6 inside the groove of the metal insulation layer. The middle of the metal centrifugal fan is connected to the drive shaft of the motor 7 extending out of the metal insulation layer. The metal insulation layer is located inside the air fryer body above the inner pot. A plastic centrifugal fan 8 is provided at the top of the groove of the metal insulation layer. The middle of the plastic centrifugal fan and the metal centrifugal fan is connected to the drive shaft of the motor extending out of the metal insulation layer. An NTC temperature sensor 9 is provided on one side of the outer diameter of the dry-burning pipe and steam pipe inside the groove of the metal insulation layer.

[0020] Therefore, the heating system in this air fryer, equipped with this heating element, ensures both excellent air-frying performance and strong steaming capabilities. The heating element places the fan blades at the center of the heater, transferring the heat generated by the dry-burning element to the food via thermal convection during air-frying. Furthermore, it integrates the steaming and baking systems of existing steam air fryers into a single unit, ensuring optimal steaming and baking performance and better meeting the needs of both domestic and international users.

Claims

1. A two-in-one heater, comprising a dry-burning tube (2) and a steam tube (1), wherein the dry-burning tube is annular, and the terminals at both ends of the dry-burning tube are bent and fixed to a first bracket (3); the steam tube corresponds to the shape of the dry-burning tube and is disposed on the outer diameter of the dry-burning tube; the steam tube is connected to a water tank, a water pump, and a steam generator through the first bracket; characterized in that... The steam pipe (1) is located between at least two layers of dry-burning pipes (2) arranged in a ring and fits the outer diameter of the upper and lower dry-burning pipes. One end of the steam pipe is connected to the pipeline through the first bracket (3), and the other end of the steam pipe is bent downward and faces the lower pot body.

2. The dual-function heater according to claim 1, characterized in that... The wire ends of one side of the dry-burning tube (2) are bent and fixed to the first bracket (3). At the same time, the end of the dry-burning tube bent into a ring shape on the other side is sealed and connected as one unit through the connector (201).

3. The dual-function heater according to claim 1, characterized in that... The opening and diameter of the steam pipe (1) are square, and the outer diameter of the dry-burning pipe (2) attached to the steam pipe is a flat key surface.

4. The two-in-one heater according to claim 3, characterized in that... The dry-burning tube (2) includes a first heating tube (202) and a second heating tube (203) with two layers. The outer diameter of one side of the steam pipe (1) of the first heating tube is a flat key surface, and the second heating tube is a square tube with flat key surfaces on both sides.

5. The dual-function heater according to claim 1, characterized in that... The outer diameter of the dry-burning pipe (2) and steam pipe (1) on the other side of the first bracket (3) is provided with a second bracket (4). The dry-burning pipe and steam pipe are fixed in the groove of the metal insulation layer (5) through the first bracket and the second bracket. The dry-burning pipe and steam pipe are set in the groove of the metal insulation layer and outside the metal centrifugal fan (6). The middle of the metal centrifugal fan is connected to the drive shaft of the motor (7) that extends out of the metal insulation layer. The metal insulation layer is set in the body of the air fryer above the inner pot.

6. The two-in-one heater according to claim 5, characterized in that... The top of the groove of the metal insulation layer (5) is provided with a plastic centrifugal fan (8), and the middle of the plastic centrifugal fan and the metal centrifugal fan are connected to the drive shaft of the motor (7) that extends out of the metal insulation layer.

7. The dual-function heater according to claim 5, characterized in that... An NTC temperature sensor (9) is provided on one side of the outer diameter of the dry-burning tube (2) and the steam tube (1) inside the groove of the metal insulation layer (5).

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