Magnesium oxide heating block and forming jig

Abstract

The utility model provides a magnesium oxide heating block, which comprises a fixed seat, a heating wire, a conductive column and a magnesium oxide main body, the heating wire is embedded in the fixed seat; the two conductive columns are arranged at the two ends of the heating wire respectively. The fixed seat and the heating wire are arranged in the magnesium oxide main body, and one end, connected with the heating wire, of the conductive column is embedded in the magnesium oxide main body; wherein the magnesium oxide main body is formed by pressing and baking magnesium oxide powder, and resin can be properly added. According to the magnesium oxide heating block provided by the utility model, the magnesium oxide main body is used for replacing the existing ceramic, the magnesium oxide main body can be made at the temperature of 300 DEG C, the problem of high-temperature oxidation of the conductive column is avoided, and the position of the heating wire in the magnesium oxide main body is limited by the fixed seat, so that the heating block is more uniform in the heating process; meanwhile, the utility model further provides a forming jig which is used for pressing and forming the magnesium oxide heating block.

Description

Technical Field

[0001] The utility model relates to the technical field of heating blocks, in particular to a magnesium oxide heating block and a forming jig. Background Art

[0002] The existing heating blocks are mainly composed of ceramics, heating wires, terminal pins (conductive columns), etc. The heating wires are heated by supplying electricity to the conductive columns to increase the temperature. The heating blocks can be widely used in various products, such as fireplaces. Most of the existing heating blocks are sintered by ceramics, that is, high-temperature sintering at a temperature of more than 1000°C is required. However, the terminal pins will undergo high-temperature oxidation at a temperature of 800°C, resulting in blackening, which greatly affects the appearance of the heating block.

[0003] In view of this, the inventor specially designed a magnesium oxide heating block and a molding jig, and this case was thus generated. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a magnesium oxide heating block, which uses a magnesium oxide body to replace the existing ceramic, and the magnesium oxide body can be made at a temperature of only 300°C, thereby avoiding the problem of high-temperature oxidation of the conductive column.

[0005] Another purpose of the utility model is to provide a forming jig.

[0006] A magnesium oxide heating block provided by the utility model comprises:

[0007] A fixing seat, the fixing seat plays a supporting role;

[0008] A heating wire, wherein the heating wire is embedded in the fixing seat;

[0009] Conductive posts, two of which are provided and are respectively provided at two ends of the heating wire;

[0010] The magnesium oxide body, the fixing seat and the heating wire are both arranged inside the magnesium oxide body, and one end of the conductive column connected to the heating wire is embedded in the magnesium oxide body.

[0011] The magnesium oxide heating block of the utility model utilizes a magnesium oxide main body to replace the existing ceramics, and the magnesium oxide main body can be manufactured at a temperature of only 300°C, thereby avoiding the problem of high-temperature oxidation of the conductive column. At the same time, a fixing seat is used to limit the position of the heating wire in the magnesium oxide main body, so that the heating block is more uniform during the heating process.

[0012] In some embodiments of the present invention, the heating wire is spiral-shaped.

[0013] In some embodiments of the present invention, a plurality of first grooves for embedding the heating wires are disposed on the upper end surface of the fixing seat.

[0014] In some embodiments of the present invention, the fixing seat adopts an integrated structure and is in a cubic shape as a whole; the interior of the fixing seat is hollow, that is, a through hole is opened from the upper end surface of the fixing seat.

[0015] In some embodiments of the present invention, the fixing seat is made of a ceramic piece, and the material of the ceramic piece is a high temperature resistant material, such as magnesium oxide, aluminum oxide, zirconium oxide, silicon oxide, beryllium oxide, etc.

[0016] According to a molding jig of the utility model, the molding jig is mainly used for molding a magnesium oxide heating block, which includes a base with an opening on the top and a pressing block arranged at the opening of the base and used for pressing.

[0017] In some embodiments of the present invention, a second groove for avoiding the conductive column is provided on the base.

[0018] In some embodiments of the present invention, the base includes a bottom plate and an annular step disposed above the bottom plate, and the inside of the annular step is hollow.

[0019] In some embodiments of the present invention, the forming process of the magnesium oxide heating block is as follows:

[0020] First, a fixing seat is made by sintering ceramic material; at the same time, the heating wire is wound into a thread shape, and conductive columns are welded at both ends;

[0021] Second, a layer of magnesium oxide powder is laid on the base, a fixing seat is placed in the center, and a heating wire with a conductive column is embedded in the groove of the fixing seat;

[0022] Third, continue to lay magnesium oxide powder, and try to keep the thickness consistent with the second step, then cover with the pressing block and apply pressure, with small pressure and multiple times during the pressing process;

[0023] Fourth, after demoulding the pressed magnesium oxide heating block, place it in a drying oven for baking to solidify the adhesive;

[0024] The magnesium oxide powder laid in the second and third steps can be added with an appropriate amount of resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] in:

[0027] Figure 1 This is a schematic diagram of the structure of the magnesium oxide heating block of the utility model;

[0028] Figure 2 This is an exploded view of the magnesium oxide heating block of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the molding jig of the utility model;

[0030] Figure 4 It is a schematic diagram of the test of the utility model;

[0031] Figure 5 It is an experimental data diagram of the present utility model.

[0032] Description of labels:

[0033] 10. fixing seat; 11. first groove; 20. heating wire; 30. conductive column; 40. magnesium oxide body; 50. base; 51. second groove; 60. pressing block; 70. sealing block. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Example 1

[0036] See also Figures 1 to 2 , is a magnesium oxide heating block as the first embodiment of the utility model, including a fixing seat 10, a heating wire 20, a conductive column 30, and a magnesium oxide body 40, wherein the fixing seat 10 has a supporting function; the heating wire 20 is embedded in the fixing seat 10; two conductive columns 30 are provided, and are respectively provided at both ends of the heating wire 20; the fixing seat 10 and the heating wire 20 are both provided inside the magnesium oxide body 40, and one end of the conductive column 30 connected to the heating wire 20 is embedded in the magnesium oxide body 40; wherein the magnesium oxide body 40 is formed by pressing and baking magnesium oxide powder, and resin can be appropriately added to further improve the strength of the magnesium oxide body. The magnesium oxide heating block of the utility model replaces the existing ceramics by using the magnesium oxide body 40, and the magnesium oxide body 40 can be made at a temperature of only 300°C, thereby avoiding the problem of high-temperature oxidation of the conductive column 30, and at the same time, the fixing seat 10 is used to limit the position of the heating wire 20 in the magnesium oxide body 40, so that the heating block is more uniform during the heating process.

[0037] The heating wire 20 is in a spiral shape to increase the length of the heating wire 20 in a straight state, thereby improving the heating efficiency of the heating wire 20 within a limited distance.

[0038] The upper end surface of the fixing seat 10 is provided with a plurality of first grooves 11 for embedding the heating wire 20. The fixing seat 10 can be an integrated structure, and the whole is in a cubic shape; the interior of the fixing seat 10 is hollow, that is, a through hole is opened from the upper end surface of the fixing seat, which can save the material of the fixing seat; the fixing seat 10 is made of a ceramic part, and the material of the ceramic part is a high temperature resistant material, such as magnesium oxide, aluminum oxide zirconium oxide, silicon oxide, beryllium oxide, etc., that is, it is pressed and sintered by a high temperature resistant material.

[0039] Example 2

[0040] See also Figure 3 , is a molding jig as embodiment 2 of the utility model, which is mainly used for pressing and molding a magnesium oxide heating block, and includes a base 50 with an opening on the top, a pressing block 60 disposed at the opening of the base 50 and used for pressing, and a second groove 51 for avoiding the conductive column 30 is disposed on the base 50. Specifically, the second groove 51 communicating with the interior is disposed on the base 50, and two sealing blocks 70 are disposed for blocking part of the second groove 51.

[0041] The base 50 is hollow inside to form a pressing cavity. The outer dimension of the pressing block 60 is equal to or slightly smaller than the inner dimension of the pressing cavity. Both the base 50 and the pressing block 60 are made of metal.

[0042] The base 50 in this embodiment can be composed of a bottom plate and an annular step, wherein the second groove 50 is arranged on the annular step, and the interior of the annular step is hollow as a pressing cavity; specifically, two second grooves 50 are arranged on the lower end surface of the annular step, and when the sealing block 70 is embedded in the second groove, a hole is formed for the conductive column 30 to pass through.

[0043] The forming process of the magnesium oxide heating block is as follows:

[0044] First, a fixing seat 10 is made by sintering a ceramic material; at the same time, a heating wire 20 is wound into a thread shape, and conductive posts 30 are welded at both ends;

[0045] Second, a layer of magnesium oxide powder is laid on the base 50, and the fixing base 10 is placed at the center, and the heating wire 20 with the conductive column 30 is embedded in the groove of the fixing base 10;

[0046] Third, continue to lay magnesium oxide powder, and try to make the thickness consistent with the thickness of the second magnesium oxide powder, then cover the pressing block 60 and apply pressure, and press with small pressure and press for multiple times during the pressing process;

[0047] Fourth, after demoulding the pressed magnesium oxide heating block, place it in a drying oven for baking to solidify the adhesive;

[0048] The magnesium oxide powder laid in the second and third steps can be added with a proper amount of resin, and the baked magnesium oxide blocks have a certain strength and a smooth surface.

[0049] Test 1 of the magnesium oxide heating block: Power-on voltage: 55V; Temperature control: 300℃ on for 60min off for 20min; After power on, no splitting or disintegration of the magnesium oxide block was found; Insulation before power on: 1*10 6 MΩ insulation after power on: 1*10 6 MΩ;

[0050] The magnesium oxide heating block is powered on, and a temperature rise and fall test is performed: the power-on voltage is 60V; a temperature sensing wire is set at position C of the magnesium oxide block to control the temperature at 300°C, and temperature sensing wires No. 1 and No. 2 are set at positions A and B respectively. The magnesium oxide block is powered on, and the first stage is the power-on temperature rise stage, in which the temperature of the magnesium oxide block is raised from room temperature 27.5°C to position C to reach 300°C. The second stage is the temperature control stabilization stage, in which the temperature at position C is stabilized at 300°C for a period of time. The third stage is the cooling and heat release stage. After disconnecting the power supply, the time taken for the magnesium oxide block to cool down to 35°C is recorded. For specific data, see Table 1 and Figure 4 , 5 .

[0051] Heating stage 8 minutes and 48 seconds Temperature control stabilization stage 11 minutes and 40 seconds Cooling and exothermic stage 1 hour, 38 minutes, 12 seconds

[0052] Table 1

[0053] Through the above experiments, it can be seen that all parameters of the magnesium oxide heating block meet the requirements.

[0054] To sum up, the magnesium oxide heating block of the utility model utilizes a magnesium oxide main body to replace the existing ceramics, and the magnesium oxide main body can be sintered at a temperature of only 300°C, thus avoiding the problem of high-temperature oxidation of the conductive column. At the same time, a fixed seat is used to limit the position of the heating wire in the magnesium oxide main body, so that the heating block is more uniform during the heating process.

[0055] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A magnesium oxide heating block, characterized in that: include: A fixing seat, the fixing seat plays a supporting role; A heating wire, wherein the heating wire is embedded in the fixing seat; Conductive posts, two of which are provided and are respectively provided at two ends of the heating wire; The magnesium oxide body, the fixing seat and the heating wire are both arranged inside the magnesium oxide body, and one end of the conductive column connected to the heating wire is embedded in the magnesium oxide body.

2. A magnesium oxide heating block according to claim 1, characterized in that: The heating wire is in a spiral shape.

3. A magnesium oxide heating block according to claim 1, characterized in that: The upper end surface of the fixing seat is provided with a plurality of first grooves for embedding the heating wires.

4. A magnesium oxide heating block according to claim 3, characterized in that: The fixing seat adopts an integrated structure and is in a cubic shape as a whole; the interior of the fixing seat is hollow.

5. A magnesium oxide heating block according to claim 1, characterized in that: The fixing seat is made of ceramic.

6. A forming jig for producing a magnesium oxide heating block as described in any one of claims 1 to 5, characterized in that: The utility model comprises a base with an opening on the top and a pressing block which is arranged at the opening of the base and is used for pressing.

7. A forming jig according to claim 6, characterized in that: The base is provided with a second groove for avoiding the conductive column.

8. A forming jig according to claim 6, characterized in that: The base comprises a bottom plate and an annular step arranged above the bottom plate, and the inside of the annular step is hollow.

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