Brazing constant temperature composite multi-layer inner pot process for electric rice cooker

Abstract

The present application relates to a kind of brazing thermostatic composite multilayer electric rice cooker inner container process, comprising the following steps: a. take a piece of circular stainless steel and aluminum composite sheet, aluminum layer one side wall is coated with flux, with stainless steel layer in, aluminum layer in the outside is stretched into a inner container shell;Take a piece of circular stainless steel and aluminum composite sheet, aluminum layer one side wall is coated with flux, with stainless steel layer in, aluminum layer in the outside is stretched into a inner container shell;B. the inner container shell is punched, forms the heat-conducting liquid channel line of outward bulge.C. the flux on the inner container shell is evenly applied, the inner container shell is placed in the inner container shell, and the two are closely together;D. the inner container shell and the inner container shell are brazed.E. after brazing, form a complete electric rice cooker inner container.F. inject heat-conducting liquid and seal.The beneficial effect is that electric rice cooker inner container is made of composite material multilayer welding, which has good heat conductivity and maintains high strength.

Description

Technical Field

[0001] This invention relates to a process for manufacturing an inner pot for a rice cooker. Background Technology

[0002] An electric rice cooker is an easy-to-use cooking tool that uses electricity to convert into heat energy, heating rice in the inner pot to cook it into rice.

[0003] It is clean and healthy, and can steam, boil and cook porridge, making it a common household appliance.

[0004] The invention of the rice cooker has reduced cooking time for many families. Rice is usually the main ingredient for cooking rice and porridge.

[0005] As living standards improve, the demand for higher quality food is also increasing.

[0006] The inner pot of existing rice cookers is made of metal and has relatively fast heat conduction, which is insufficient in terms of heat insulation.

[0007] When cooking porridge, the heat retention performance of the electric cooker is crucial due to the long cooking time. A rice cooker with poor heat retention must continuously activate the electric heater during the heat preservation process, consuming a significant amount of energy and increasing energy consumption.

[0008] Our rice cooker manufacturers have invented a multi-layered inner pot with good heat retention. However, the existing inner pots are difficult to composite with multiple layers. Using ordinary welding methods, adjacent layers of the multi-layered inner pot are prone to peeling off. Summary of the Invention

[0009] To overcome the shortcomings of current inner pots where adjacent layers are prone to peeling off, this invention provides a brazing constant temperature composite multilayer rice cooker inner pot process.

[0010] The technical solution of this invention to solve its technical problem is: a process for brazing a constant temperature composite multilayer rice cooker inner pot, comprising the following steps:

[0011] a. Take a circular composite sheet of stainless steel and aluminum, with flux applied to one side of the aluminum layer, and stretch it to form an inner shell with the stainless steel layer on the outside and the aluminum layer on the inside; take a circular composite sheet of stainless steel and aluminum, with flux applied to one side of the aluminum layer, and stretch it to form an inner shell with the stainless steel layer on the inside and the aluminum layer on the outside; the size of the outer shell is larger than the size of the inner shell.

[0012] b. Stamp the inner and outer shells to form outward-protruding heat-conducting channels.

[0013] c. Spread the flux evenly on the inner shell of the inner liner, place the inner shell of the inner liner inside the outer shell of the inner liner, and make sure the two are tightly joined together;

[0014] d. Braze the inner shell and the outer shell of the inner liner. The brazing temperature is between 580 and 650°C, and the heating time is 15 to 20 minutes.

[0015] e. After brazing, the inner pot of the rice cooker is removed to form a complete inner pot. A heat-conducting channel is formed between the aluminum layers of the inner and outer shells of the inner pot.

[0016] f. Inject heat transfer fluid into the heat transfer fluid channel and seal it.

[0017] The brazing temperature was further optimized, and the brazing temperature in process d was 605 degrees.

[0018] The thickness of the rice cooker is optimized, and the thickness of the inner pot of the rice cooker in the non-heat-conducting liquid channel area in process e is between 2mm and 4mm.

[0019] Further preferably, the thickness of the rice cooker inner pot in the non-heat-conducting liquid channel area of ​​process e is 3mm.

[0020] The thickness of the four metal layers is optimized. In the composite sheet of stainless iron and aluminum in process a, the thickness of the stainless iron layer is 0.5 mm and the thickness of the aluminum layer is 0.7 mm. In the composite sheet of stainless steel and aluminum, the thickness of the stainless steel layer is 0.6 mm and the thickness of the aluminum layer is 1.2 mm.

[0021] The stainless iron is selected based on its material properties, and the stainless iron is 430 stainless iron.

[0022] The beneficial effects of this invention are as follows: 1. The inner pot of the rice cooker is made of multi-layer welded composite materials, maintaining high strength while possessing good thermal conductivity. 2. The inner pot is made of two composite plates brazed together, with the brazing joint made of the same aluminum material, resulting in high brazing strength and preventing the thermal fluid in the formed heat-conducting channels from easily detaching and leaking. 3. The inner layer of the rice cooker's inner pot is made of stainless steel, which has good corrosion resistance and can be directly scrubbed with a steel wool pad, making it easy to clean. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the welding process in one embodiment.

[0024] Figure 2 This is a schematic diagram of the inner pot of a rice cooker in one embodiment.

[0025] Figure 3 This is a cross-sectional schematic diagram of an embodiment.

[0026] Figure 4 yes Figure 3 Enlarged diagram of point A in the diagram. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0028] Combined with appendix Figures 1 to 4 A brazing process for a constant-temperature composite multilayer rice cooker inner pot includes the following steps:

[0029] a. Take a circular composite sheet of stainless steel and aluminum, with flux applied to one side of the aluminum layer, and stretch it to form an inner shell 1 with the stainless steel layer on the outside and the aluminum layer on the inside; take a circular composite sheet of stainless steel and aluminum, with flux applied to one side of the aluminum layer, and stretch it to form an inner shell 2 with the stainless steel layer on the inside and the aluminum layer on the outside; the size of the inner shell 1 is larger than the size of the inner shell 2.

[0030] b. Stamp the inner liner shell 1 to form outwardly protruding heat-conducting fluid channels 3.

[0031] c. Spread the flux evenly on the inner shell 2 of the inner liner, place the inner shell 2 into the outer shell 1 of the inner liner, and the two are tightly joined together.

[0032] d. Braze the inner shell 2 and the outer shell 1 of the inner liner. The brazing temperature is between 605℃ and the heating time is 15~20 minutes.

[0033] e. After brazing, the inner pot of the rice cooker is removed to form a complete inner pot. A heat-conducting liquid channel 4 is formed between the aluminum layers of the inner shell 2 and the outer shell 1.

[0034] f. Inject heat transfer fluid into the heat transfer fluid channel and seal it.

[0035] The thickness of the rice cooker is optimized, and the thickness of the inner pot of the rice cooker in the non-heat-conducting liquid channel area in process e is between 2mm and 4mm.

[0036] Further preferably, the thickness of the rice cooker inner pot in the non-heat-conducting liquid channel area of ​​process e is 3mm.

[0037] The thickness of the four metal layers is optimized. In the composite sheet of stainless iron and aluminum in process a, the thickness of stainless iron layer 5 is 0.5 mm and the thickness of aluminum layer 6 is 0.7 mm. In the composite sheet of stainless steel and aluminum, the thickness of stainless steel layer 7 is 0.6 mm and the thickness of aluminum layer 8 is 1.2 mm.

[0038] The stainless iron is selected based on its material properties, and the stainless iron is 430 stainless iron.

[0039] The beneficial effects of this invention are as follows: 1. The inner pot of the rice cooker is made of multi-layer welded composite materials, maintaining high strength while possessing good thermal conductivity. 2. The inner pot is made of two composite plates brazed together, with the brazing joint made of the same aluminum material, resulting in high brazing strength and preventing the thermal fluid in the formed heat-conducting channels from easily detaching and leaking. 3. The inner layer of the rice cooker's inner pot is made of stainless steel, which has good corrosion resistance and can be directly scrubbed with a steel wool pad, making it easy to clean.

Claims

1. A process for manufacturing a brazed thermostatic composite multi-layer inner vessel for a rice cooker, characterized in that: The method comprises the following steps a. Take a round stainless steel and aluminum composite sheet, the aluminum layer on one side wall coated with flux, with stainless steel layer outside, aluminum layer inside to stretch forming a liner shell; take a round stainless steel and aluminum composite sheet, the aluminum layer on one side wall coated with flux, with stainless steel layer inside, aluminum layer outside to stretch forming a liner inner shell; the size of the liner shell is larger than the size of the liner inner shell; b. Punch the liner shell to form outwardly convex heat-conducting liquid channel lines; c. Evenly smear the flux on the liner inner shell, and place the liner inner shell in the liner shell, tightly together; d. Brazing the liner inner shell and the liner shell, the brazing temperature is between 580~650℃, the heating time of brazing is 15~20 minutes; e. After brazing, take out a complete electric rice cooker liner, the aluminum layer between the liner inner shell and the liner shell forms a heat-conducting liquid channel; f. Inject heat-conducting liquid into the heat-conducting liquid channel and seal it; Wherein, the liner shell and the liner inner shell are made of composite material stretch forming multilayer welding, the heat-conducting liquid channel lines are outwardly convex structure, the brazing place is aluminum structure of the same material.

2. The process for brazing thermostatic composite multi-layer inner pot of electric rice cooker as claimed in claim 1 wherein: In the step a, the thickness of the stainless steel layer in the stainless steel and aluminum composite sheet is 0.5mm, the thickness of the aluminum layer is 0.7mm, the thickness of the stainless steel layer in the stainless steel and aluminum composite sheet is 0.6mm, and the thickness of the aluminum layer is 1.2mm; The brazing temperature in process d is 605 degrees; The thickness of the electric rice cooker liner in the non-heat-conducting liquid channel area in process e is between 2mm~4mm.

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