Built-in protection type furnace wire assembly

Abstract

The utility model provides a built-in protective furnace wire assembly, which relates to the technical field of heating furnaces and comprises a protective tube, a furnace wire and leads, two ends of the protective tube are plugged, a hollow cavity for placing the furnace wire is arranged in the protective tube, two ends of the furnace wire respectively penetrate out of the plugging at two ends of the protective tube, or two ends of the furnace wire are respectively connected with one lead. The two leads penetrate out of the plugs at the two ends of the protective tube respectively, and the tube wall of the protective tube is provided with an opening for the furnace wire to emit heat outwards. The furnace wire is arranged in the protective pipe with the opening, so that the furnace wire is protected, and the heating of the furnace wire is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heating furnace technical field, specifically to a built-in protection type furnace wire assembly. BACKGROUND

[0002] The common heating furnace furnace wire structure is that the furnace wire is wound outside the support pipe, and when the furnace wire breaks, the winding wire spreads and lengthens, which can damage the surrounding heat insulation cotton and the product being fired. UTILITY MODEL CONTENTS

[0003] To solve the above technical problems, the utility model provides a built-in protection type furnace wire assembly, which realizes protection of the furnace wire by embedding the furnace wire in the protection pipe with an opening, and does not affect the heating of the furnace wire.

[0004] To achieve the above technical purpose, the technical scheme adopted is: a built-in protection type furnace wire assembly, including a protection pipe, a furnace wire and a lead, both ends of the protection pipe are blocked, and the inside has a hollow cavity for placing the furnace wire, both ends of the furnace wire are respectively threaded out from the blocking of both ends of the protection pipe, or both ends of the furnace wire are respectively connected with a lead, so that the two leads are respectively threaded out from the blocking of both ends of the protection pipe, and the protection pipe wall is provided with an opening for the furnace wire to heat outward.

[0005] Beneficial effects: the furnace wire is embedded in the protection pipe, and after aging and breaking, the furnace wire is restrained in the pipe and is not easy to fall off the pipe body, realizing protection of the furnace wire, the furnace body and the product, and not affecting the outward heating. The protection pipe surface is provided with a plurality of openings, which facilitates the rapid conduction of the heating of the furnace wire surface to the heating furnace environment, prevents heat accumulation in the protection pipe and improves the heat release efficiency. The furnace wire is embedded in the protection pipe, and the protection pipe and the furnace wire are integrally pulled out and installed during replacement, or the furnace wire is directly replaced, which is convenient to operate.

[0006] Further, the cross-sectional shape of the protection pipe is circular or regular polygonal.

[0007] Beneficial effects: the protection pipe is processed into a circular or regular polygonal shape, which is convenient for processing and facilitates heating in all directions, and the openings can be processed according to the desired heating position.

[0008] Further, the opening is a long slot.

[0009] Beneficial effects: for the protection pipe made of brittle material, the long slot ensures sufficient opening area and low damage degree, ensuring the yield and use effect.

[0010] Further, the furnace wire is spirally wound by heating wire.

[0011] Beneficial effects: the furnace wire is spirally wound by heating wire, which increases the heating capacity of the furnace wire in a limited space, and the furnace wire is quickly formed.

[0012] Further, the outer diameter of the heating wire is 3-5mm smaller than the inner diameter of the protection tube.

[0013] Beneficial effect: the size can quickly insert the protection tube, and the size of the heating wire is as large as possible, so that the heat output is sufficient.

[0014] Further, a through hole is formed on the end of the lead wire for welding after the heating wire is inserted.

[0015] Beneficial effect: the connection between the lead wire and the heating wire is facilitated, and the connection effect is enhanced, so that the breakage between the lead wire and the heating wire is prevented.

[0016] Further, the two ends of the protection tube are open and are plugged by detachable plugs, and the plugs are provided with through holes for the lead wire to pass through.

[0017] Beneficial effect: the two ends of the protection tube are plugged by the plugs, so that the plugs are taken out to open the two ends, and the heating wire inside is replaced.

[0018] Further, the outer edge of one end of the plug is chamfered.

[0019] Beneficial effect: the one end with the chamfer is inserted into the protection tube first, so that the plug is aligned and inserted.

[0020] Further, a plurality of openings are formed along the circumferential direction of the protection tube or are formed on one side.

[0021] Beneficial effect: by setting the direction of the openings, the heating direction of the heating wire is limited, the heat in the non-heating direction is reduced, other components in the direction which does not need to be heated are not damaged, and the heating wire assembly is arranged more flexibly in the heating furnace. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the protection tube of the utility model;

[0024] Figure 3 It is a first cross-sectional view of the opening of the protection tube of the utility model;

[0025] Figure 4 It is a second cross-sectional view of the opening of the protection tube of the utility model;

[0026] Figure 5 It is an installation schematic diagram of the heating wire and the lead wire of the utility model;

[0027] Figure 6 It is an installation schematic diagram of the lead wire of the utility model;

[0028] Figure 7 It is the schematic view of the welding of the heating wire and the lead wire of the utility model;

[0029] Figure 8 It is the schematic view of the plug of the utility model;

[0030] Figure 9 It is the schematic view of the installation of the plug of the utility model;

[0031] In the drawing: 1, the protective tube, 2, the plug, 3, the heating wire, 4, the lead wire, 11, the opening, 41, the perforation, 21, the through hole, 22, the chamfer. DETAILED DESCRIPTION

[0032] The preferred embodiments of the utility model are described in detail below in combination with the drawings, and the utility model will be described in detail by the corresponding drawings. It needs to be specially pointed out that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting or defining the utility model.

[0033] In the description of the present embodiment, the terms "inner", "outer", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0034] As shown in Figure 1 , Figure 2 A built-in protection type heating wire assembly, including protective tube 1, heating wire 3 and lead wire 4, the both ends of protective tube 1 are blocked, and the inside has a hollow cavity for placing heating wire 3, protective tube 1 is equal-diameter tube, and the material is high-alumina, corundum or other high-temperature-resistant insulating material. The installation of heating wire 3 is divided into two cases: (1) the both ends of heating wire 3 are respectively threaded out from the blocking of the both ends of protective tube 1, and the structure is used for small-power heating wire, and the lead wire can be directly threaded out without being connected. (2) the both ends of heating wire 3 are respectively connected with a lead wire 4, so that the two lead wires 4 are respectively threaded out from the blocking of the both ends of protective tube 1, and the structure is used for large-power heating wire. The effect of welding the lead wire is that the diameter of the lead wire is larger than that of the heating wire, the resistance of the lead wire part is reduced, the heating of the lead wire part is reduced, the heating of the both ends of the heating wire is reduced, the temperature of the both ends of the heating wire is prevented from being too high, the temperature of the furnace wall is also high, the heat loss is large, and the wiring is damaged. The opening 11 for the outward heating of heating wire 3 is formed on the wall of protective tube 1, and the position and size of the opening are determined according to the design of the heating furnace.

[0035] As shown in Figure 3 , Figure 4As shown, the plurality of openings 11 are arranged along the circumferential direction of the protection tube 1 or on one side. When arranged along the circumferential direction, heat can be generated all around, for example Figure 3 As shown, the plurality of openings 11 are arranged along the circumferential direction of the protection tube 1 or on one side. When arranged along the circumferential direction, heat can be generated all around, for example Figure 4 As shown, the plurality of openings 11 are arranged along the circumferential direction of the protection tube 1 or on one side. When arranged along the circumferential direction, heat can be generated all around, for example

[0036] The shape of the opening 11 is not limited, and an elongated hole is preferably used. For the protection tube made of ceramic, the protection tube is very brittle, and the shape of the surface opening will affect the degree of damage to the tube. A single circular hole causes the least damage, but in order to ensure the amount of heat generated, a large number of holes need to be opened, which makes the processing of the protection tube difficult and causes a large degree of damage. The two ends of the elongated hole are circular arcs, and the middle part is a straight line. The elongated hole is directly milled by a drill bit, taking into account the opening area and the degree of damage.

[0037] As shown in Figure 3 , Figure 4 The cross-sectional shape of the protection tube 1 is circular. The cross-sectional shape of the protection tube is not shown in the figure, and can be a regular triangle, a square, a regular pentagon, a regular hexagon, etc. The openings 11 can be arranged according to the corresponding direction of different surfaces.

[0038] As shown in Figure 5 , the heating wire 3 is formed by spirally winding a heating wire. The outer diameter of the heating wire 3 is 3-5 mm smaller than the inner diameter of the protection tube 1, so as to be fitted into the protection tube 1. The shape of the heating wire can be a round wire or a flat wire.

[0039] As shown in Figure 6 , Figure 7 , a through hole 41 is formed on one end of the lead wire 4 for welding after the heating wire 3 is inserted. The lead wire 4 is a cylindrical metal rod, and the diameter is larger than the diameter of the heating wire 3. The lead wire 4 is usually made of the same material as the heating wire 3. A circular hole 41 is formed on the end of the lead wire 4 connected to the heating wire 3. The diameter of the circular hole 41 is larger than the diameter of the heating wire 3, which facilitates the insertion of the heating wire 3. After the end of the heating wire 3 is inserted into the circular hole 41, the heating wire 3 is welded to ensure stable connection.

[0040] As shown in Figure 8 , the two ends of the protection tube 1 are open and are sealed by removable plugs 2. The cross-sectional shape of the plug 2 is the same as that of the protection tube 1. The plug 2 is provided with a through hole 21 for the lead wire 4 to pass through. The outer diameter of the plug 2 is about 0.2 mm smaller than the inner diameter of the protection tube 1, so as to be fitted into the protection tube 1 and not to fall off. When subjected to a pushing force, the plug 2 can be taken out of the protection tube 1 without the need for other detachable connection structures (screw structures). The diameter of the through hole 21 is 3-5 mm larger than the diameter of the lead wire 4, which facilitates the lead wire to pass through. The plug 2 is fitted into the protection tube 1, and the lead wire 4 passes through the through hole 21. The plug is made of alumina silicate insulation block, fire-retardant bakelite, polytetrafluoroethylene or other heat-resistant and insulating materials.

[0041] As Figure 8 , Figure 9 shown, the outer edge of one end of the plug 2 has a chamfer 22, which can be quickly inserted into the protective tube 1 by using the chamfer 22.

[0042] The above is only the preferred example of the utility model, and is not used for limiting or defining the utility model. For the researchers or technicians in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope declared by the utility model.

Claims

1. A guard-in-place heating element assembly, characterized by: The utility model relates to a heating element, which comprises a protective tube (1), a heating wire (3) and a lead wire (4), the two ends of the protective tube (1) are blocked, and the inside of the protective tube (1) has a hollow cavity for placing the heating wire (3), the two ends of the heating wire (3) respectively pass out from the blocking of the two ends of the protective tube (1), or the two ends of the heating wire (3) are respectively connected with a lead wire (4), so that the two lead wires (4) respectively pass out from the blocking of the two ends of the protective tube (1), and the wall of the protective tube (1) is provided with an opening (11) for the heating wire (3) to heat outward.

2. A sheathed wire element as defined in claim 1, wherein: The cross section of the protective tube (1) is circular or regular polygonal.

3. An internally shielded resistance wire assembly as defined in claim 1 wherein: The opening (11) is a long hole.

4. A sheathed wire element as defined in claim 1, wherein: The heating wire (3) is formed by spirally winding a heating wire.

5. A guard-in-place wire element assembly as defined in claim 1 wherein: The outer diameter of the heating wire (3) is 3-5mm smaller than the inner diameter of the protective tube (1).

6. A guard-in-place wire element as defined in claim 1, wherein: A through hole (41) for welding after the heating wire (3) passes in is formed on the end of the lead wire (4).

7. A sheathed resistance wire assembly as defined in claim 1 wherein: The two ends of the protective tube (1) are open and blocked by detachable plugs (2), and the plugs (2) are provided with through holes (21) for the lead wire (4) to pass through.

8. A sheathed wire element as defined in claim 7, wherein: The outer edge of one end of the plug (2) is provided with a chamfer (22).

9. A sheathed resistance wire assembly as defined in claim 1 wherein: A plurality of openings (11) are arranged along the circumferential direction of the protective tube (1) or are arranged on one side.

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