High-pressure internal molding method for the inner pot of a thermostatic composite multi-layer rice cooker

Abstract

To provide an internal high-pressure molding method for an inner pot of a constant-temperature composite multilayer rice cooker.SOLUTION: An internal high-pressure molding method for an inner pot of a constant-temperature composite multilayer rice cooker includes the steps of: a. providing a first brazing flux layer between a prepared stainless steel plate and an aluminum plate to constitute an inner layer plate assembly with the stainless steel plate on the inside and the aluminum plate on the outside; b. placing the inner layer plate assembly in a mold and stretch-molding it to form the inner layer of the rice cooker inner pot; c. providing a second brazing flux layer between a prepared stainless steel plate and an aluminum plate to constitute an outer layer plate assembly with the aluminum plate on the inside and the stainless steel plate on the outside; d. placing the outer layer plate assembly in a mold and stretch-molding it to form the outer layer of the rice cooker inner pot; e. brazing the outer layer plate assembly; and f. placing the outer layer plate assembly in an internal high-pressure molding mold to mold a heat transfer fluid channel. As an advantageous effect, the stretch outer layer plate assembly uses an internal high-pressure water expansion device to mold the thermal fluid channel into a desired thermal fluid pipe so as to have a high yield during the molding process.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the technical field of rice cookers, and more particularly to a method for constant temperature molding of inner pots for rice cookers. [Background technology]

[0002] A rice cooker is a convenient cooking appliance that converts electrical energy into thermal energy and uses it to heat the rice in the inner pot to cook it. It is clean, healthy, and can be used every day to steam, boil, and cook porridge.

[0003] The invention of the rice cooker has reduced cooking time for many households. Rice is usually the main ingredient for cooking rice and porridge. As living standards improve, the demands on food quality also increase. The inner pot of a traditional rice cooker is made of metal, which has thermal conductivity that allows for faster heat transfer, but poor insulation.

[0004] When cooking porridge, the cooking time is long, so the heat retention performance of the electric rice cooker is also very important. Rice cookers with poor heat retention capabilities need to keep the electric heater running during the heat retention process, which consumes a lot of energy and increases energy consumption.

[0005] Rice cooker manufacturers have invented a stainless steel thermostatic multi-layer inner pot with excellent heat retention, but the defect rate during molding of the heat transfer fluid channels in conventional stainless steel thermostatic multi-layer inner pots was high. Summary of the Invention [Problem to be solved by the invention]

[0006] In order to overcome the drawbacks of the conventional method for forming the inner pot of a stainless steel constant temperature composite multi-layer rice cooker, which is complicated and has a high reject rate, the present invention aims to provide a method for forming the inner pot of a constant temperature composite multi-layer rice cooker under high pressure. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides an internal high-pressure molding method for an inner pot for a thermostatic composite multi-layer rice cooker, comprising the following steps a. to i. a. A process of providing a first brazing flux layer between a prepared stainless steel plate and an aluminum plate to form an inner layer plate assembly with a stainless steel plate on the inside and an aluminum plate on the outside; b. A process of placing the inner layer plate assembly in a mold and stretching it to form the inner layer of the inner pot for the rice cooker; c. A process of providing a second brazing flux layer between the prepared stainless steel plate and aluminum plate to form an outer layer plate assembly with an aluminum plate on the inside and a stainless steel plate on the outside; d. The outer layer plate set is placed in a mold and stretched to form the outer layer of the inner pot for the rice cooker; e. A process of brazing the outer layer plate assembly; f. The outer layer plate set is placed in an internal high-pressure molding die to form a heat transfer fluid channel; g. Inserting the inner layer plate assembly into the outer layer plate assembly to form an inner pot blank, and providing a third brazing flux layer between the inner layer plate assembly and the outer layer plate assembly; h. Brazing the inner pot blank; i. A step of injecting a heat transfer fluid into the heat transfer fluid channel and sealing it to form an inner pot for a rice cooker.

[0008] In a preferred embodiment of the internal high pressure molding method, a water expansion molding die is used as the internal high pressure molding die in the step f.

[0009] In order to prevent the inner layer plate set from slipping, the inner layer plate set prior to step g is brazed first.

[0010] In a preferred embodiment of the outer layer plate set, the stainless steel plate layers in the steps c and e are covered with an aluminum layer, and the process proceeds directly to step d without brazing with a brazing flux between the two.

[0011] In a preferred embodiment of the brazing, the brazing temperature is in the range of 580 to 650°C, and the heating time for brazing is 15 to 20 minutes.

[0012] More preferably, the brazing temperature is 605°C.

[0013] As a preferred embodiment of the thickness of the rice cooker inner pot, the thickness of the rice cooker inner pot is in the range of 2 mm to 4 mm.

[0014] In a more preferred embodiment of the thickness of the rice cooker inner pot, the thickness of the rice cooker inner pot is 3 mm.

[0015] As a preferred embodiment of the thickness of each layer, in the inner layer plate set, the stainless steel layer is 0.6 mm thick and the aluminum layer is 1.2 mm thick, and in the outer layer plate set, the stainless steel layer is 0.5 mm thick and the aluminum layer is 0.7 mm thick.

[0016] In a preferred embodiment of the stainless steel plate, the stainless steel plate is stainless steel 430.

[0017] The stainless steel inner pot manufactured according to the present invention can be used in the same manner as the conventional stainless steel thermostatic composite inner pot, and therefore a detailed description thereof will be omitted here. [Effects of the Invention]

[0018] The advantageous effects of the present invention include the following. 1. After stretching, the outer layer plate set uses an internal high-pressure water expansion device to form the thermal fluid channel into the desired thermal fluid conduit, which has a high yield during the forming process. 2. The inner pot for the rice cooker is made of multi-layer welded composite materials, which provides excellent thermal conductivity while maintaining greater strength. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a schematic diagram showing a combination of two plates of an inner layer plate set according to one embodiment. [Figure 2] FIG. 2 is a schematic diagram showing a combination of an inner layer board set and an outer layer board set according to one embodiment. [Figure 3] 2 is a schematic diagram of each board layer according to an embodiment. FIG. [Figure 4] 1 is a schematic diagram of an inner pot for a rice cooker according to one embodiment. [Figure 5] FIG. 1 is a schematic cross-sectional view of one embodiment. [Figure 6] FIG. 6 is a schematic enlarged view of a portion A in FIG. 5. [Figure 7] FIG. 6 is a schematic cross-sectional view of the heat transfer fluid channel region of FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described in detail below with reference to the drawings and examples. [Example]

[0021] Referring to FIGS. 1 to 7, a method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure includes the following steps: a. A step of providing a first brazing flux layer 2 between a prepared stainless steel plate 1 and an aluminum plate to form an inner layer plate assembly with a stainless steel plate on the inside and an aluminum plate on the outside; b. A process of placing the inner layer plate set in a mold and stretching it to form the inner layer 3 of the inner pot for a rice cooker; c. A process of stretching an aluminum plate coated with a stainless steel plate layer to form the outer layer 6 of the inner pot for a rice cooker. f. The outer layer plate set is placed in an internal high-pressure molding die to form the heat transfer fluid channel 7; g. Inserting the inner layer plate assembly into the outer layer plate assembly to form an inner pot blank, and providing a third brazing flux layer 8 between the inner layer plate assembly and the outer layer plate assembly; h. Brazing the inner pot blank; i. A step of injecting a heat transfer fluid into the heat transfer fluid channel 7 and sealing it to form an inner pot for a rice cooker.

[0022] In a preferred embodiment of the internal high pressure molding method, a water expansion molding die is used as the internal high pressure molding die in the step f.

[0023] In order to prevent the inner layer plate set from slipping, the inner layer plate set prior to step g is brazed first.

[0024] In a preferred embodiment of the brazing, the brazing temperature is in the range of 580 to 650°C, and the heating time for brazing is 15 to 20 minutes.

[0025] More preferably, the brazing temperature is 605°C.

[0026] In a more preferred embodiment of the thickness of the rice cooker inner pot, the thickness of the rice cooker inner pot is 3 mm.

[0027] As a preferred embodiment of the thickness of each layer, in the inner layer plate set, the stainless steel layer is 0.6 mm thick and the aluminum layer is 1.2 mm thick, and in the outer layer plate set, the stainless steel layer is 0.5 mm thick and the aluminum layer is 0.7 mm thick.

[0028] In a preferred embodiment of the stainless steel plate, the stainless steel plate is stainless steel 430.

[0029] The stainless steel inner pot manufactured in this embodiment is used in the same way as the conventional stainless steel thermostatic composite inner pot, so a detailed description thereof will be omitted here. [Example]

[0030] Referring to FIGS. 1 to 7, a method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure includes the following steps: a. A step of providing a first brazing flux layer 2 between a prepared stainless steel plate 1 and an aluminum plate to form an inner layer plate assembly with a stainless steel plate on the inside and an aluminum plate on the outside; b. A process of placing the inner layer plate set in a mold and stretching it to form the inner layer 3 of the inner pot for a rice cooker; c. A process of providing a second brazing flux layer 5 between the prepared stainless steel plate 4 and aluminum plate to form an outer layer plate assembly with the aluminum plate on the inside and the stainless steel plate on the outside; d. The outer layer plate set is placed in a mold and stretched to form the outer layer of the inner pot for the rice cooker; e. A process of brazing the outer layer plate assembly; f. The outer layer plate set is placed in an internal high-pressure molding die to form the heat transfer fluid channel 7; g. Inserting the inner layer plate assembly into the outer layer plate assembly to form an inner pot blank, and providing a third brazing flux layer 8 between the inner layer plate assembly and the outer layer plate assembly; h. Brazing the inner pot blank; i. A step of injecting a heat transfer fluid into the heat transfer fluid channel 7 and sealing it to form an inner pot for a rice cooker.

[0031] In a preferred embodiment of the internal high pressure molding method, a water expansion molding die is used as the internal high pressure molding die in the step f.

[0032] In order to prevent the inner layer plate set from slipping, the inner layer plate set prior to step g is brazed first.

[0033] In a preferred embodiment of the brazing, the brazing temperature is in the range of 580 to 650°C, and the heating time for brazing is 15 to 20 minutes.

[0034] More preferably, the brazing temperature is 605°C.

[0035] In a more preferred embodiment of the thickness of the rice cooker inner pot, the thickness of the rice cooker inner pot is 3 mm.

[0036] As a preferred embodiment of the thickness of each layer, in the inner layer plate set, the stainless steel layer is 0.6 mm thick and the aluminum layer is 1.2 mm thick, and in the outer layer plate set, the stainless steel layer is 0.5 mm thick and the aluminum layer is 0.7 mm thick.

[0037] In a preferred embodiment of the stainless steel plate, the stainless steel plate is stainless steel 430.

[0038] The stainless steel inner pot manufactured in this embodiment is used in the same way as the conventional stainless steel thermostatic composite inner pot, so a detailed description thereof will be omitted here.

[0039] The advantageous effects of the present invention are: 1. After stretching, the outer layer plate assembly uses an internal high-pressure water expansion device to form the thermal fluid channel into the desired thermal fluid pipeline, resulting in a high yield during the forming process; and 2. The inner pot for the rice cooker is manufactured using multi-layer welding of composite materials, which has excellent thermal conductivity while maintaining higher strength.

Claims

1. High-pressure molding method for the inner pot of a thermostatic composite multi-layer rice cooker a. A step of providing a first brazing flux layer between a prepared stainless steel plate and an aluminum plate to form an inner layer plate assembly with a stainless steel plate on the inside and an aluminum plate on the outside; b) A step of placing the inner layer plate set in a mold and stretching it to form the inner layer of the inner pot for a rice cooker; c) providing a second brazing flux layer between the prepared stainless steel plate and aluminum plate to form an outer layer plate assembly with the aluminum plate on the inside and the stainless steel plate on the outside; d) A step of placing the outer layer plate set in a mold and stretch-molding it to form the outer layer of the inner pot for the rice cooker; e) brazing the outer layer plate set; f) placing the outer layer plate set into an internal high-pressure molding die to form heat transfer fluid channels; g) Inserting the inner layer plate set into the outer layer plate set to form an inner kettle blank, and providing a third brazing flux layer between the inner layer plate set and the outer layer plate set; h) brazing the inner kettle blank; i) Injecting a heat transfer fluid into the heat transfer fluid channel and sealing it to form the inner pot for the rice cooker. A method for forming an inner pot of a thermostatic composite multi-layer rice cooker under high pressure, characterized by the above-mentioned.

2. 2. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure according to claim 1, wherein the inner high pressure forming mold in step f is a water expansion forming mold.

3. 2. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure according to claim 1, wherein the inner layer plate assembly is brazed before step g.

4. 2. The internal high-pressure forming method for the inner pot of a thermostatic composite multi-layer rice cooker according to claim 1, wherein the stainless steel plate layers in steps c and e are covered with aluminum layers, and the process proceeds directly to step d without brazing between the two layers with brazing flux.

5. The method for forming the inner pot of a thermostatic composite multi-layer rice cooker with high pressure according to claim 1, characterized in that the brazing temperature is in the range of 580 to 650°C, and the heating time for brazing is 15 to 20 minutes.

6. 6. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure as claimed in claim 5, wherein the brazing temperature is 605°C.

7. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure according to claim 5, wherein the thickness of the inner pot of the rice cooker is in the range of 2 mm to 4 mm.

8. 6. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure according to claim 5, wherein the thickness of the inner pot is 3 mm.

9. 6. The internal high-pressure forming method for the inner pot of a thermostatic composite multi-layer rice cooker according to claim 5, wherein the thickness of the stainless steel layer in the inner layer plate set is 0.6 mm and the thickness of the aluminum layer is 1.2 mm, and the thickness of the stainless steel layer in the outer layer plate set is 0.5 mm and the thickness of the aluminum layer is 0.7 mm.

10. 2. The method for forming an inner pot of a thermostatic composite multi-layer rice cooker with high pressure as claimed in claim 1, wherein the stainless steel plate is made of stainless steel 430.

Images