A high thermal efficiency electric heating rod

Abstract

The utility model discloses a high thermal efficiency electric heating rod, comprising a heat-conducting outer shell, a core shaft arranged in the outer shell, and a resistance wire arranged on the core shaft, wherein the core shaft is made of insulating heat-preserving fiber, and a plurality of semi-buried pits are axially formed on the surface of the core shaft, and the resistance wires are axially embedded and installed in the plurality of pits. The present application achieves the purpose of heating the outer surface of the core shaft by externally embedding the resistance wire on the outer surface of the core shaft, and can increase the heating area and improve the heat radiation rate under the same power, thereby reducing energy consumption; the heat will not gather in the center, causing the loss of heat energy; the semi-buried resistance wire installation method can protect the resistance wire from being easily deformed during high-temperature operation, thereby improving the service life.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating, in particular to an electric heating rod with high thermal efficiency. Background Art

[0002] Electric heating tubes and radiant tubes are devices that convert electrical energy into thermal energy to heat the materials to be heated. The electric heating element is enclosed in a protective sleeve. After power is turned on for heating, the sleeve indirectly radiates heat to the furnace lining and the heated workpiece. The electric heating wire in traditional electric heating tubes and radiant tubes is generally wound with electric heating wire or electric heating tape on a heat-resistant insulating ceramic tube core with spiral grooves.

[0003] When used in heating environments such as large heaters, high-temperature furnaces, heat treatment furnaces, large sleeves, crucible heating packs, high-temperature heat exchangers, and pipeline heating, a denser wire layout design will be used. For example, multiple electric heating tubes and radiant tubes are assembled in stacked form. The heat generated is not easily transferred to the center of the electric heating tubes and radiant tubes, resulting in loss of heat energy and waste of resources. Summary of the invention

[0004] In view of this, the utility model aims to provide an electric heating rod with high thermal efficiency.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a high thermal efficiency electric heating rod, comprising a heat-conducting outer shell, a core shaft arranged in the outer shell and a resistance wire arranged on the core shaft, the core shaft is made of insulating and heat-preserving fiber, and a plurality of semi-buried pits are axially formed on the surface of the core shaft, and the resistance wires are axially embedded and installed in the plurality of pits respectively.

[0006] Preferably, the outer shell is formed with one end open and the other end closed, and a shaft end cover made of insulating and heat-preserving fiber is provided on one side of the opening of the outer shell. The shaft end cover is closed on the core shaft and is arranged in the opening of the outer shell.

[0007] Furthermore, a plurality of ceramic connecting pieces are arranged on the outer end surface of the shaft end cover, and the ceramic connecting pieces are electrically connected to the lead wires of the resistance wire.

[0008] Preferably, the core shaft is formed into a tubular structure with a hollow interior.

[0009] Preferably, the outer shell is formed with one end open and the other end closed, and the closed end of the outer shell is formed in an outward arc shape.

[0010] Preferably, the outer shell is formed with one end open and the other end closed, a sleeve is formed at the open end of the outer shell, and a plurality of reinforcing ribs are formed between the sleeve and the outer shell.

[0011] Preferably, the diameter of the outer shell is greater than 700 mm.

[0012] The technical effects of the utility model are mainly reflected in the following aspects: the resistance wire is embedded and installed on the outer surface of the core shaft to achieve the purpose of heating the outer surface of the core shaft. Under the same power, the heating area is increased, the heat radiation rate is improved, and thus the energy consumption is reduced; the heat will not gather in the center to cause the loss of heat energy; the semi-buried resistance wire installation method can protect the resistance wire from deformation during high temperature operation and increase its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the simple structure of the resistance wire arrangement in the prior art Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the simple structure of the resistance wire arrangement in the prior art Figure 1 ;

[0015] Figure 3 It is a schematic diagram of the overall decomposition structure of the utility model;

[0016] Figure 4 This is a schematic diagram of the overall front structure of the utility model;

[0017] Figure 5 For this utility model Figure 4 Schematic diagram of the cross-section structure;

[0018] Figure 6 This is a schematic diagram of the end surface structure of the utility model;

[0019] Figure 7 For this utility model Figure 6 Schematic diagram of the cross-section structure;

[0020] Figure 8 It is a schematic diagram of the core shaft end surface structure of the utility model.

[0021] 1-outer shell; 11-arc shape; 12-sleeve; 13-reinforcement rib; 2-core shaft; 21-pit groove; 3-resistance wire; 4-shaft end cover; 5-ceramic terminal. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Example

[0023] according to Figure 1-2As shown, a high thermal efficiency electric heating rod comprises a heat-conducting outer shell 1, a core shaft 2 arranged in the outer shell 1 and a resistance wire 3 arranged on the core shaft 2. In a traditional electric heating rod, the resistance wire 3 is wound around the ceramic core shaft as a furnace core, and the furnace core is then placed in the outer shell 1. When used in medium and large equipment, multiple furnace cores need to be stacked or surrounded in the outer shell 1 for use. At this time, a denser wire layout design will be adopted, and the generated heat is not well transmitted at the center of the electric heating tube and the radiation tube, resulting in heat energy loss and waste of resources.

[0024] like Figure 3-8 In the present application, the core shaft 2 is made of insulating and heat-preserving fiber, such as composite ceramic fiber, and a plurality of semi-buried grooves 21 are axially formed around the surface of the core shaft 2, and the resistance wires 3 are axially embedded and installed in the plurality of grooves 21 respectively.

[0025] The resistance wire 3 is embedded and installed on the outer surface of the core shaft 2 to achieve the purpose of generating heat on the outer surface of the core shaft 2. Most of the heat can be transferred outward from the surface of the core shaft 2, which can increase the heating area and improve the heat radiation rate under the same power, thereby reducing energy consumption; the heat generated by the resistance wire 3 on the surface of the core shaft 2 will not accumulate in the center, and will not cause a large loss of heat energy; the semi-buried resistance wire 3 installation method can protect the resistance wire 3 from being easily deformed during high-temperature operation, thereby increasing its service life.

[0026] The core shaft 2 can be formed into a columnar structure; when applied to larger equipment, the core shaft 2 can also be formed into a tubular structure with a hollow interior.

[0027] The outer shell 1 is formed with one end open and the other end closed. A shaft end cover 4 made of insulating and heat-preserving fiber is arranged on the opening side of the outer shell 1. The shaft end cover 4 is closed and covered on the core shaft 2 and arranged in the opening of the outer shell 1. The shaft end cover 4 is used to insulate the outer end of the core shaft 2 to prevent heat loss; a plurality of ceramic wiring members 5 are arranged on the outer end surface of the shaft end cover 4, and the ceramic wiring members 5 are electrically connected to the leads of the resistance wire 3.

[0028] The closed end of the outer shell 1 is formed into an outward arc shape 11 to increase the outward heat radiation area of ​​the outer shell 1.

[0029] A sleeve 12 is formed at one open end of the outer shell 1 , and a plurality of reinforcing ribs 13 are formed between the sleeve 12 and the outer shell 1 .

[0030] The structure of the present application can be applied to small, medium and large heating equipment. For example, the outer diameter of conventional electric heating tubes and radiation tubes is 80-250mm. When applied to large heating equipment, the diameter of the outer shell 1 can be more than 700mm.

Claims

1. A high thermal efficiency electric heating rod, comprising a heat-conducting outer shell, a core shaft arranged in the outer shell, and a resistance wire arranged on the core shaft, characterized in that: The core shaft is made of insulating and heat-preserving fiber, and a plurality of semi-buried pits are axially formed on the surface of the core shaft, and the resistance wires are axially embedded and installed in the plurality of pits.

2. The high thermal efficiency electric heating rod according to claim 1, characterized in that: The outer shell is formed with one end open and the other end closed, and a shaft end cover made of insulating and heat-preserving fiber is arranged on one side of the opening of the outer shell. The shaft end cover is closed and covered on the core shaft and arranged in the opening of the outer shell.

3. The high thermal efficiency electric heating rod according to claim 2, characterized in that: A plurality of ceramic connecting pieces are arranged on the outer end surface of the shaft end cover, and the ceramic connecting pieces are electrically connected to the lead wires of the resistance wire.

4. A high thermal efficiency electric heating rod according to any one of claims 1 to 3, characterized in that: The core shaft is formed into a tubular structure with a hollow interior.

5. The high thermal efficiency electric heating rod according to claim 1, characterized in that: The outer shell is formed with one end open and the other end closed, and the closed end of the outer shell is formed in an outward arc shape.

6. The high thermal efficiency electric heating rod according to claim 1, characterized in that: The outer shell is formed with one end open and the other end closed, a sleeve is formed at the open end of the outer shell, and a plurality of reinforcing ribs are formed between the sleeve and the outer shell.

7. The high thermal efficiency electric heating rod according to claim 1, characterized in that: The outer shell has a diameter of 700 mm or more.

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