Solid alumina-filled high voltage fused salt electric heater

Abstract

The utility model relates to a solid aluminum oxide filled high-voltage fused salt electric heater and belongs to the technical field of heating. The electric heater is composed of an upper copper rod lead, a lower copper rod lead, an upper aluminum oxide rod plug, a lower aluminum oxide rod plug, an aluminum oxide rod protection filling, a nickel-chromium alloy resistance wire, a fin sleeve, a U-shaped copper rod lead and a U-shaped sleeve. The upper copper rod lead is connected with the upper aluminum oxide rod plug and the nickel-chromium alloy resistance wire through screw threads. The upper aluminum oxide rod plug is connected with the fin sleeve through screw threads. The lower aluminum oxide rod plug is connected with the fin sleeve and the U-shaped sleeve through screw threads. The aluminum oxide rod protection filling serves to fix the position of the resistance wire and prevent high-voltage breakdown. The fin sleeve serves to increase heat dissipation and can adopt longitudinal fins or circular fins. The U-shaped copper rod lead and the U-shaped sleeve are filled with aluminum oxide powder to prevent high-voltage breakdown.

Description

TECHNICAL FIELD

[0001] The application designs a solid alumina filled high-voltage molten salt electric heater, belonging to the field of valley electricity utilization and molten salt electric heating. BACKGROUND

[0002] Valley electricity heat storage refers to using electricity as energy to heat a heat storage medium during the valley electricity period, and storing the energy in a heat storage device, and releasing the heat energy in the heat storage device during the peak electricity period. The valley electricity heat storage can be used for industrial steam supply or central heating. Current electric heaters mostly use 380V voltage heating, and it is difficult to meet the demand of more than 1000kW electric heating in the field of valley electricity heat storage. The use of 10kV voltage heating can meet the demand of heating power. When the electric resistance wire is broken, the current electric heater can only replace the whole heating pipe, which is high in cost. In summary, the current electric heater is difficult to meet the power requirement, has poor flexibility, high maintenance cost, and cannot meet the demand of heating molten salt heat storage under high voltage conditions. SUMMARY

[0003] The purpose of the application is to provide a solid alumina filled high-voltage molten salt electric heater. The electric heater is prevented from being broken down by high voltage, and alumina rods are used as protective filling, so that 10kV voltage can be used for heating. Through modular design, each part is independent of each other, effectively solving the problem of unable to replace the damaged electric resistance wire.

[0004] A solid alumina filled high-voltage molten salt electric heater, comprising two upper copper rod leads (1), two lower copper rod leads (6), two upper alumina rod plugs (2), two lower alumina rod plugs (7), two alumina filling protection pipes (5), two nichrome electric resistance wires (3), two fin sleeve pipes (4), a U-shaped copper rod lead (8), and a U-shaped sleeve pipe (9). The upper copper rod lead (1) and the lower copper rod lead (6) are each provided with a thread outside. The upper alumina rod plug (2) and the lower alumina rod plug (7) have the same structure: the central shaft has a threaded through hole, and the outer periphery of the plug is threaded. The fin sleeve pipe (4) has the following structure: the inner surfaces of the upper part and the lower part corresponding to the center through hole of the sleeve pipe are each provided with a thread. The alumina filling protection pipe (5) is an alumina pipe with a through hole in the central shaft. The U-shaped copper rod lead (8) is a U-shaped copper rod, and the two upper ends of the U-shaped structure are provided with threads outside.

[0005] The U-shaped copper rod lead (8) with the opening upward is located in the U-shaped sleeve (9), and the U-shaped copper rod lead (8) is filled with alumina powder and compacted between the gaps of the U-shaped sleeve (9); the outer side of the two upper ends of the U-shaped copper rod lead (8) is correspondingly provided with a lower alumina rod plug (7), the upper end of the U-shaped copper rod lead (8) is inserted into the lower part of the threaded hole of the lower alumina rod plug (7) to be threadedly connected, and the lower part of the lower copper rod lead (6) is inserted into the upper part of the threaded hole of the lower alumina rod plug (7) to be threadedly connected; the upper end of the lower copper rod lead (6) is connected with the lower end of the nichrome resistance wire (3), and preferably the lower end of the nichrome resistance wire (3) is fixedly connected with the outer thread of the lower copper rod lead (6) in the form of spring or threaded winding; the lower alumina rod plug (7) is coaxially located at the lower part of the central through hole of the fin sleeve (4) and is fixedly connected with the fin sleeve (4) by threads;

[0006] The upper end of each nichrome resistance wire (3) is connected with the lower part of the upper copper rod lead (1), and preferably the upper end of the nichrome resistance wire (3) is fixedly connected with the outer thread of the upper copper rod lead (1) in the form of spring or threaded winding; the upper copper rod lead (1) is coaxially inserted through the upper alumina rod plug (2), and the two are fixedly connected by threads; the upper alumina rod plug (2) is coaxially located at the upper part of the central through hole of the fin sleeve (4) and is fixedly connected with the fin sleeve (4) by threads;

[0007] The nichrome resistance wire (3) passes through the through hole of the alumina filling protection tube (5); the alumina filling protection tube (5) is coaxially located in the central through hole of the fin sleeve (4), and there is a gap between the alumina filling protection tube (5) and the fin sleeve (4); the upper and lower ends of the alumina filling protection tube (5) correspond to the upper alumina rod plug (2) and the lower alumina rod plug (7) and are fixed by the upper alumina rod plug (2) and the lower alumina rod plug (7);

[0008] The fin sleeve (4) is provided with circumferential annular fins or axial longitudinal fins;

[0009] The grade of the nichrome resistance wire is Cr20Ni80, and the nichrome resistance wire adopts a spiral structure;

[0010] The alumina rod protection filling plays a role in fixing the position of the resistance wire and preventing high-voltage breakdown; the U-shaped copper rod lead and the U-shaped sleeve are filled with alumina powder to prevent high-voltage breakdown.

[0011] The purpose of the present application is to provide a solid alumina filled high-voltage molten salt electric heater, which is filled with alumina rods as protection, prevents high-voltage breakdown, and can be heated with 10kV voltage; by modularizing each component, each part is independent of each other, effectively solving the problem of being unable to replace damaged resistance wires. The solid alumina rod filled molten salt electric heater for working under high voltage conditions is mainly applied to the field of molten salt valley heat storage. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a semi-decomposition structure schematic diagram of the solid alumina filled high-voltage molten salt electric heater provided by the present application.

[0013] Figure 2 is a partial schematic diagram of the upper copper rod lead, the alumina rod plug and the nichrome resistance wire.

[0014] Figure 3 is a partial schematic diagram of the lower copper rod lead, the U-shaped lead, the alumina rod plug and the nichrome resistance wire.

[0015] Figure 4 is a schematic diagram of the installation effect of the solid alumina filled high-voltage molten salt electric heater.

[0016] Figure 5 is a schematic diagram of the longitudinal fin.

[0017] Figure 6 is a schematic diagram of the annular fin.

[0018] In the figure, the upper copper rod lead 1, the upper alumina rod plug 2, the nichrome resistance wire 3, the fin sleeve 4, the longitudinal fin 4-1, the annular fin 4-2, the alumina filled protection tube 5, the lower copper rod lead 6, the lower alumina plug 7, the U-shaped copper rod lead 8 and the U-shaped sleeve 9. DETAILED DESCRIPTION

[0019] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present application, the technical solutions of the present application will be described in detail below, but it cannot be understood as limiting the implementable scope of the present application. The contents shown in the figure are only schematic diagrams, not representing the final proportion and structure.

[0020] As shown in the figure, a solid alumina filled high-voltage molten salt electric heater comprises an upper copper rod lead 1, an upper alumina rod plug 2, a nickel-chromium alloy resistance wire 3, a fin sleeve 4, an alumina filling protection tube 5, a lower copper rod lead 6, a lower alumina plug 7, a U-shaped copper rod lead 8, and a U-shaped sleeve 9. The upper copper rod lead 1 is provided with threads and is connected with the upper alumina rod plug 2 through threads; the upper alumina rod plug 2 is provided with a threaded hole in the middle and is connected with the fin sleeve 4 through threads; the fin sleeve 4 is provided with longitudinal fins 4-1 or annular fins 4-2 and is gap-fitted with the alumina filling protection tube 5 inside; the alumina filling protection tube 5 is provided with a through hole in the middle, the nickel-chromium alloy resistance wire 3 passes through the through hole and there is a gap between the two; the upper and lower ends of the nickel-chromium alloy resistance wire 3 are connected with the upper copper rod lead 1 and the lower copper rod lead 6 in the form of thread winding; the lower copper rod lead 6 is provided with threads and is connected with the U-shaped copper rod lead 8 and the lower alumina rod plug 7 through threads, that is, the lower copper rod lead 6 and the U-shaped copper rod lead 8 are connected and fixed through the lower alumina rod plug 7; the U-shaped copper rod lead 8 is filled with alumina powder between the U-shaped sleeve 9; and the U-shaped sleeve 9 is connected with the lower alumina rod plug 7 through threads.

[0021] In the present application, the size of the hole and the threads in the copper rod lead and the alumina rod plug are all in accordance with the national standard.

[0022] In the present application, the fin sleeve 4 is provided with longitudinal fins 4-1 or annular fins 4-2 outside in consideration of the heat dissipation of the electric heater.

[0023] The installation method is as follows: from bottom to top, first, the U-shaped copper rod lead 8 is gap-fitted with the U-shaped sleeve 9, the inside is filled with alumina powder and is compacted; the lower copper rod lead 6 is connected with the U-shaped copper rod lead 8 in the form of thread winding; the lower alumina rod plug 7 is thread-connected with the lower copper rod lead 6 and the U-shaped sleeve 9; the nickel-chromium alloy resistance wire 3 is thread-connected with the lower copper rod lead 6, the fin sleeve 4 is thread-connected with the lower alumina rod plug; the alumina filling protection tube 5 is inserted into the fin sleeve 4 and the nickel-chromium alloy resistance wire 3 passes through the through hole inside; the upper copper rod lead 1 is thread-connected with the nickel-chromium alloy resistance wire 3; the upper alumina rod plug is thread-connected with the upper copper rod lead 1 and the fin sleeve 4.

[0024] Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art can make modifications, improvements and equivalent replacements to the technical solutions recorded in the foregoing embodiments or make equivalent replacements to part of the technical features, and any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-voltage molten salt electric heater filled with solid alumina, characterized in that, It includes two upper copper rod leads (1), two lower copper rod leads (6), two upper alumina rod plugs (2), two lower alumina rod plugs (7), two alumina-filled protective tubes (5), two nickel-chromium alloy resistance wires (3), two finned sleeves (4), one U-shaped copper rod lead (8), and one U-shaped sleeve (9); the upper copper rod leads (1) and the lower copper rod leads (6) are both provided with threads on the outside; the upper alumina rod plugs (2) and the lower alumina rod plugs (7) have the same structure: the central shaft has a threaded through hole, and the outer circumference of the plug is threaded; the structure of the finned sleeve (4): the upper and lower inner surfaces corresponding to the central through hole of the sleeve are both provided with threads; the alumina-filled protective tube (5) is an alumina tube with a through hole on the central shaft; the U-shaped copper rod lead (8) is a copper rod with a U-shaped structure, and the outer sides of the two upper ends of the U-shaped structure are provided with threads; The U-shaped copper rod lead (8) with its opening facing upward is located inside the U-shaped sleeve (9). The gap between the U-shaped copper rod lead (8) and the U-shaped sleeve (9) is filled with alumina powder and compacted. A lower alumina rod plug (7) is provided on the outer side of each of the two upper ends of the U-shaped copper rod lead (8). The upper end of the U-shaped copper rod lead (8) is inserted into the lower part of the threaded through hole of the lower alumina rod plug (7) for threaded connection. The lower part of the lower copper rod lead (6) is inserted into the upper part of the threaded through hole of the lower alumina rod plug (7) for threaded connection. The upper end of the lower copper rod lead (6) is connected to the lower end of the nickel-chromium alloy resistance wire (3). The lower end of the nickel-chromium alloy resistance wire (3) is fixedly connected to the threaded part outside the lower copper rod lead (6) by means of spring or threaded winding. The lower alumina rod plug (7) is coaxially located at the lower part of the central through hole of the fin sleeve (4) and the two are fixedly connected by threads. The upper end of each nickel-chromium alloy resistance wire (3) is connected to the lower part of the upper copper rod lead (1). The upper end of the nickel-chromium alloy resistance wire (3) is fixedly connected to the thread outside the upper copper rod lead (1) by means of spring or thread winding. The upper copper rod lead (1) passes through the upper alumina rod plug (2) coaxially, and the two are fixedly connected by threads. The upper alumina rod plug (2) is located coaxially above the central through hole of the fin sleeve (4), and the two are fixedly connected by threads. The nickel-chromium alloy resistance wire (3) passes through the through hole of the alumina-filled protective tube (5); the alumina-filled protective tube (5) is coaxially located in the central through hole of the finned sleeve (4), and there is a gap between the alumina-filled protective tube (5) and the finned sleeve (4); the upper and lower ends of the alumina-filled protective tube (5) are the upper alumina rod plug (2) and the lower alumina rod plug (7), which are clamped and fixed by the upper alumina rod plug (2) and the lower alumina rod plug (7).

2. A high-voltage molten salt electric heater filled with solid alumina according to claim 1, characterized in that, The finned sleeve (4) has circumferential annular fins or axial longitudinal fins on its outer periphery.

3. A high-voltage molten salt electric heater filled with solid alumina according to claim 1, characterized in that, The nickel-chromium alloy resistance wire is of grade Cr20Ni80 and has a spiral structure.

4. The application of a high-voltage molten salt electric heater filled with solid alumina as described in any one of claims 1-3, for use in molten salt electric heaters that operate under high voltage conditions and are protected by solid alumina rods, in the field of molten salt valley electricity storage.

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