Composite heating disc capable of reducing shear stress of welding layer

Abstract

The utility model relates to a composite heating disc capable of reducing shear stress of a welding layer, which comprises a stainless steel disc, the upper end of the stainless steel disc is connected with a heat transfer aluminum plate which is arranged in a cut-off mode, the upper end of the heat transfer aluminum plate is connected with two aluminum electric heating tubes, and the upper ends of the aluminum electric heating tubes are connected with an automatic reset temperature controller through a support. One end of each aluminum electric heating tube is connected with a temperature sensor, the aluminum electric heating tubes are connected with the automatic reset temperature controller through connecting rods, the stainless steel disc, the heat transfer aluminum plate and the two aluminum electric heating tubes are welded and formed, and the cut aluminum plate is welded with the stainless steel disc and the aluminum electric heating tubes, so that the basic length of deformation can be effectively reduced; therefore, the deformation is reduced, the stress is reduced, and the service life is ensured.

Description

Technical Field

[0001] This utility model relates to the field of heating plate technology, and in particular to a composite heating plate that can reduce the shear stress of the weld layer. Background Technology

[0002] Electric kettles, rice cookers, and other household appliances use electric heating plates to generate heat, which is then transferred through an aluminum alloy base plate to a stainless steel or aluminum alloy container to heat water and food. However, the traditional brazing method for aluminum alloy electric heating plates involves welding a circular aluminum alloy plate to the heating element. The brazing material used is powdered aluminum alloy filler metal, aluminum solder paste, or aluminum alloy filler metal sheets. Protected by a protective gas such as ammonia decomposition gas or an inert gas, and aided by flux, a metallurgical brazing connection is formed between the heating element, the aluminum alloy plate, and the stainless steel.

[0003] However, the heating plate will deform after heating and repeated heating. Therefore, over time, this can easily increase the stress on the welded structure, thus affecting its service life. Utility Model Content

[0004] The purpose of this invention is to provide a composite heating plate that can reduce the shear stress of the weld layer. By welding a cut aluminum plate to a stainless steel plate and an aluminum heating tube, the base length of the deformation can be effectively reduced, which reduces the amount of deformation and stress, thereby ensuring its service life.

[0005] To solve the above-mentioned technical problems, the present invention provides a composite heating plate that can reduce the shear stress of the weld layer, comprising a stainless steel plate, a heat transfer aluminum plate with a cut-off section connected to the upper end of the stainless steel plate, two aluminum electric heating tubes connected to the upper end of the heat transfer aluminum plate, an automatic reset thermostat connected to the upper end of the aluminum electric heating tubes via a bracket, a temperature sensor connected to one end of the aluminum electric heating tubes, and the aluminum electric heating tubes and the automatic reset thermostat connected via a connecting rod, wherein the stainless steel plate, the heat transfer aluminum plate, and the two aluminum electric heating tubes are welded together.

[0006] Preferably, the heat transfer aluminum plate has a circular structure and is provided with four or six equal-divided grooves.

[0007] More preferably, the heat transfer aluminum plate has a positioning piece in the middle.

[0008] More preferably, the bracket is connected to the automatic reset temperature controller via a hexagonal flange nut.

[0009] A composite heating plate that can reduce the shear stress of the weld layer includes a heat transfer aluminum plate connected to a pot body, two aluminum electric heating tubes connected to the heat transfer aluminum plate, and inserts connected to both ends of the two aluminum electric heating tubes. A large steam pipe is connected to one end of the heat transfer aluminum plate, and a small steam pipe is provided on the pot body. The pot body, the heat transfer aluminum plate and the two aluminum electric heating tubes are welded together.

[0010] Preferably, the heat transfer aluminum plate has a square structure and a partition groove is formed on the heat transfer aluminum plate.

[0011] More preferably, one end of the heat transfer aluminum plate is provided with a positioning piece.

[0012] The beneficial effects of this utility model are as follows: It includes a stainless steel plate, the upper end of which is connected to a cut-off heat transfer aluminum plate. The upper end of the heat transfer aluminum plate is connected to two aluminum electric heating tubes. The upper end of each aluminum electric heating tube is connected to an automatic reset thermostat via a bracket. One end of each aluminum electric heating tube is connected to a temperature sensor. The aluminum electric heating tubes and the automatic reset thermostat are connected by a connecting rod. The stainless steel plate, the heat transfer aluminum plate, and the two aluminum electric heating tubes are welded together. By using a cut-off aluminum plate to weld to the stainless steel plate and the aluminum electric heating tubes, the length of the base for deformation can be effectively reduced, that is, the amount of deformation is reduced, the stress is reduced, thereby ensuring its service life. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0014] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the fourth-order partition groove in Embodiment 1 of this utility model.

[0016] Figure 4 This is a schematic diagram of the structure of the six-level partition groove in Embodiment 1 of this utility model.

[0017] Figure 5 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0018] Figure 6 This is a cross-sectional view of Embodiment 2 of this utility model. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] Example 1, as Figure 1-4As shown, a composite heating plate that can reduce shear stress in the weld layer includes a stainless steel plate 1. A cut-off heat-transfer aluminum plate 2 is connected to the upper end of the stainless steel plate 1. The heat-transfer aluminum plate 2 has a circular structure and is provided with four or six equally spaced grooves 10. Two aluminum heating tubes 3 are connected to the upper end of the heat-transfer aluminum plate 2. An automatic reset thermostat 5 is connected to the upper end of each aluminum heating tube 3 via a bracket 4. The bracket 4 and the automatic reset thermostat 5 are connected by a hexagonal flange nut 9. The stainless steel plate 1, the heat-transfer aluminum plate 2, and the two aluminum heating tubes 3 are welded together. The stainless steel plate 1 and the aluminum plate are made of different materials, and their coefficients of thermal expansion are as follows: The coefficient of thermal expansion of the stainless steel plate 1 is 17.2 × 10⁻⁻. 6 / ℃, the coefficient of thermal expansion of pure aluminum is 23.21×10-6 / K, the aluminum heating tube 3 is connected to the automatic reset thermostat 5 by a connecting rod 6, one end of the aluminum heating tube 3 is connected to a temperature sensor 8, the heat transfer aluminum plate 2 is provided with a positioning piece 7 in the middle, by using brazing filler metal and flux that meet the requirements of the welding process, the weld is complete after welding, the welding strength is high, and the deformation of the foundation length can be effectively reduced, that is, the amount of deformation is reduced, the stress is reduced, thereby ensuring its service life.

[0021] When the composite heating plate is used to boil water in an electric kettle, the working temperature of the composite heating plate rises from room temperature to about 120℃, a temperature rise of about 100℃. Each time it works, the working temperature of the composite heating plate also cycles once. A deformation difference of 0.07mm (by diameter) or 0.21mm (by perimeter) will be generated between the stainless steel plate and the aluminum plate (φ110mm). The welded surface will not actually deform, but shear stress of about 30MPa and 90MPa will be formed at the partition groove 10. This reduces the amount of deformation and lowers the stress of the heat transfer aluminum plate 2.

[0022] Example 2, as Figure 5 , 6 As shown, a composite heating plate that can reduce the shear stress of the weld layer includes a heat transfer aluminum plate 2 connected to a pot body 11. Two aluminum electric heating tubes 3 are connected to the heat transfer aluminum plate 2, and inserts 12 are connected to both ends of the two aluminum electric heating tubes 3. A large steam pipe 13 is connected to one end of the heat transfer aluminum plate 2, and a small steam pipe 14 is provided on the pot body 11. The pot body 11, the heat transfer aluminum plate 2, and the two aluminum electric heating tubes 3 are welded together. The heat transfer aluminum plate 2 has a square structure and a partition groove 10 is provided on the heat transfer aluminum plate 2. When the composite heating plate of this embodiment is used in an electric steamer, the water in the electric steamer is boiled dry and then refilled each time it is used. The working temperature of the composite heating plate will rise to 200°C, with a temperature rise of 180°C. Moreover, the diameter of the aluminum plate of this type of composite heating plate is φ150mm, so the deformation difference is 0.16mm (based on diameter) and 0.51mm (based on perimeter). Therefore, the deformation is small, which reduces the stress of the heat transfer aluminum plate 22.

[0023] Based on the concept of this utility model, there may be changes in the specific implementation methods and application scope. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A composite heating plate that can reduce shear stress in the weld layer, characterized in that: The device includes a stainless steel plate, with a cut-off heat transfer aluminum plate connected to the upper end of the stainless steel plate. Two aluminum heating tubes are connected to the upper end of the heat transfer aluminum plate. An automatic reset thermostat is connected to the upper end of each aluminum heating tube via a bracket. A temperature sensor is connected to one end of each aluminum heating tube. The aluminum heating tubes and the automatic reset thermostat are connected via a connecting rod. The stainless steel plate, the heat transfer aluminum plate, and the two aluminum heating tubes are welded together.

2. The composite heating plate for reducing shear stress in the weld layer according to claim 1, characterized in that: The heat transfer aluminum plate has a circular structure and is provided with four or six equal-division grooves.

3. A composite heating plate for reducing shear stress in the weld layer according to claim 1, characterized in that: The heat transfer aluminum plate has a positioning plate in the middle.

4. A composite heating plate for reducing shear stress in the weld layer according to claim 1, characterized in that: The bracket is connected to the automatic reset temperature controller via a hexagonal flange nut.

5. A composite heating plate that can reduce shear stress in the weld layer, characterized in that: The device includes a heat-transfer aluminum plate connected to the pot body, two aluminum heating tubes connected to the heat-transfer aluminum plate, and inserts connected to both ends of the two aluminum heating tubes. A large steam pipe is connected to one end of the heat-transfer aluminum plate, and a small steam pipe is provided on the pot body. The pot body, the heat-transfer aluminum plate, and the two aluminum heating tubes are welded together.

6. A composite heating plate for reducing shear stress in the weld layer according to claim 5, characterized in that: The heat transfer aluminum plate has a square structure and is provided with partition grooves.

7. A composite heating plate for reducing shear stress in the weld layer according to claim 5, characterized in that: The heat transfer aluminum plate is provided with a positioning piece at one end.

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