Heating coil

Abstract

The heating coil comprises an outer pipe body, a resistance wire, a magnesium oxide positioning rod and a sealing cover, the outer pipe body comprises a disc section and a connecting section, the disc section communicates with the connecting section, the end, away from the connecting section, of the disc section is closed, an opening is formed in the end, away from the disc section, of the connecting section, and the sealing cover is used for sealing the opening; the magnesium oxide positioning rod penetrates through the outer pipe body and is provided with a first through hole and a second through hole, one end of the resistance wire sequentially penetrates through the first through hole and the second through hole, and the two ends of the resistance wire penetrate out of the sealing covers. And one end of the outer pipe body is closed, so that the overall occupied space is reduced, and the heating coil is convenient to install.

Description

Technical Field

[0001] The present application relates to the field of heating pipes, and in particular to a heating coil. Background Art

[0002] The electric heating tube is a tubular electric heating element, which is composed of a metal tube, a spiral resistance wire, and crystallized magnesium oxide powder. The electric heating tube product is generally made of high-quality imported stainless steel tubes, imported high-temperature magnesium oxide powder, high-quality electric heating wire and other materials to make the heating element, and other structural parts are made of stainless steel. It has excellent overall performance, ultra-long life, and easy maintenance.

[0003] Reference Figure 1 The special-shaped heating tube in the prior art includes an outer tube 1 and a high-temperature resistance wire evenly arranged in the outer tube 1. The outer tube 1 includes a heating section, which is spirally arranged. The outer tube is filled with crystalline magnesium oxide powder. The high-temperature resistance wire penetrates from one end of the outer tube 1 and then passes out from the other end of the outer tube 1. When current passes through the high-temperature resistance wire, the generated heat diffuses to the surface of the metal tube through the crystalline magnesium oxide powder, and then is transferred to the heated part or water to achieve the purpose of heating.

[0004] With respect to the above-mentioned related technologies, one end of the outer tube extends outward from the center of the spiral and away from the heating section, so space needs to be reserved during installation, which makes installation inconvenient. Utility Model Content

[0005] In order to facilitate the installation of the heating pipe, the present application provides a heating coil.

[0006] The heating coil provided in this application adopts the following technical solution:

[0007] A heating coil comprises an outer tube body, a heating wire, a magnesium oxide positioning rod, and a sealing cover, wherein the outer tube body comprises a disc section and a connecting section, the disc section is connected to the connecting section, the disc section is closed at one end away from the connecting section, the connecting section is provided with an opening at one end away from the disc section, and the sealing cover is used to seal the opening, the magnesium oxide positioning rod is passed through the outer tube body, the magnesium oxide positioning rod is provided with a first through hole and a second through hole which are axially penetrated, one end of the heating wire passes through the first through hole and the second through hole in sequence, the heating wire comprises a resistance wire and connecting wires connected to both ends of the resistance wire, the resistance wire is passed through the magnesium oxide positioning rod located in the disc section, the connecting wire is passed through the magnesium oxide positioning rod located in the connecting section, and the two connecting wires pass through the sealing cover at the ends away from the resistance wire.

[0008] By adopting the above technical solution, one end of the outer tube body is closed, thereby reducing the overall occupied space and facilitating the installation of a heating coil.

[0009] Optionally, the magnesium oxide positioning rod includes a plurality of rod bodies, and the plurality of rod bodies are distributed in sequence along the length direction of the outer tube body.

[0010] By adopting the above technical solution, the positioning rod is composed of a plurality of rod bodies, so that it is convenient for the positioning rod to pass through the outer tube body.

[0011] Optionally, a groove is provided at one end of the rod body near the opening, and the length direction of the groove is consistent with the circumference of the rod body. A protrusion is connected to the other end of the rod body, and the length direction of the protrusion is consistent with the circumference of the rod body. Two adjacent rods are clamped with the protrusion and the groove.

[0012] By adopting the above technical solution, two adjacent rods are clamped together by the protrusion and the groove, so that the connection between the rods is more stable.

[0013] Optionally, a protective cover is connected to one end of the magnesium oxide positioning rod away from the opening.

[0014] By adopting the above technical solution and adding a protective cover, the resistance wire located at the end of the magnesium oxide positioning rod away from the opening and the outer tube body are insulated.

[0015] Optionally, a magnesium powder filling layer is provided in the gap between the magnesium oxide positioning rod and the inner wall of the outer tube body.

[0016] By adopting the above technical solution, a magnesium powder filling layer is added to reduce the gap between the magnesium positioning plate and the inner wall of the outer tube body, so that the magnesium positioning plate is stably connected to the outer tube body.

[0017] Optionally, the sealing cover includes a cylinder and a top cover, the length direction of the cylinder is consistent with the length direction of the connecting section, one end of the outer tube body is sleeved on the cylinder, the top cover is connected to the end of the cylinder away from the outer tube body, the top cover is in contact with the outer tube body on the side close to the cylinder, and the sealing cover is provided with two connecting holes for the connecting wires to pass through.

[0018] By adopting the above technical solution, a top cover is added to increase the contact area between the sealing cover and the outer tube body, thereby reducing the amount of moisture entering the outer tube body through the gap between the sealing cover and the outer tube body, thereby reducing the impact of moisture on the service life of the resistance wire.

[0019] Optionally, the cylinder sleeve is provided with a sealing ring, and the sealing ring is used to seal the gap between the cylinder and the inner wall of the outer tube.

[0020] By adopting the above technical solution and adding a sealing ring, the stability of the connection between the sealing cover and the outer tube body is further improved.

[0021] Optionally, a protective sleeve is connected to one end of the sealing cover away from the outer tube body, and the protective sleeve is sleeved on the connecting wire outside the outer tube body.

[0022] By adopting the above technical solution and adding a protective cover, the damage to the connecting wire caused by external forces can be reduced.

[0023] Optionally, the disc segments are arranged in a planar spiral shape.

[0024] By adopting the above technical solution, the disc segment is arranged in a spiral shape on the plane, so that the installation of the disc segment is convenient.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. One end of the outer tube is closed to reduce the overall space occupied and facilitate the installation of a heating coil;

[0027] 2. Two adjacent rods are connected by protrusions and grooves, so that the connection between the rods is more stable;

[0028] 3. Add a top cover to increase the contact area between the sealing cover and the outer tube body, thereby reducing the moisture from entering the outer tube body through the gap between the sealing cover and the outer tube body, and reducing the impact of moisture on the service life of the resistance wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural diagram of the related technology.

[0030] Figure 2 It is a three-dimensional structural diagram of this embodiment.

[0031] Figure 3 It is a cross-sectional view of this embodiment, used to show the rod body.

[0032] Figure 4 This embodiment Figure 3 Enlarged view of part A.

[0033] Figure 5 It is a cross-sectional view of this embodiment, used to show the heating wire.

[0034] Figure 6 This embodiment Figure 3 Enlarged view of part B.

[0035] Figure 7 It is a cross-sectional view of this embodiment, used to show the protective cover.

[0036] Explanation of the reference numerals: 100, outer tube body; 110, disc segment; 120, connecting segment; 121, opening; 130, magnesium powder filling layer; 200, heating wire; 210, resistance wire; 220, connecting wire; 300, magnesium oxide positioning rod; 310, first through hole; 320, second through hole; 330, protective cover; 340, rod body; 341, groove; 342, protrusion; 400, sealing cover; 410, cylinder; 411, sealing ring; 420, top cover; 430, connecting hole; 440, protective cover. DETAILED DESCRIPTION

[0037] The following is combined with Figure 2-6 This application is described in further detail.

[0038] The present application embodiment discloses a heating coil. Figure 2 and Figure 3 A heating coil comprises an outer tube body 100, a heating wire 200, a magnesium oxide positioning rod 300, and a sealing cover 400. The outer tube body 100 comprises a disc segment 110 and a connecting segment 120, the length direction of the connecting segment 120 is consistent with the vertical direction, and the disc segment 110 is arranged in a plane spiral shape, and the bottom end of the connecting segment 120 is connected to one end of the disc segment 110.

[0039] Reference Figure 3 and Figure 4 , an opening 121 for the magnesium oxide positioning rod 300 to enter is provided at the top of the connecting section 120, and the disc section 110 is closed at one end away from the connecting section 120. The magnesium oxide positioning rod 300 is inserted into the outer tube body 100, and the magnesium oxide positioning rod 300 is provided with a first through hole 310 and a second through hole 320. The length direction of the first through hole 310 is consistent with the axial direction of the magnesium oxide positioning rod 300, and the length direction of the second through hole 320 is consistent with the axial direction of the magnesium oxide positioning rod 300. One end of the heating wire 200 passes through the first through hole 310 and the second through hole 320 in sequence. The sealing cover 400 is used to seal the opening 121, and both ends of the heating wire 200 pass through the sealing cover 400 in the vertical direction and are located outside the outer tube body 100, and the outer tube body 100 is set as a stainless steel tube.

[0040] Reference Figure 5 and Figure 6 The heating wire 200 includes a resistance wire 210 and a connecting wire 220. Two connecting wires 220 are provided, and one connecting wire 220 is connected to one end of the resistance wire 210, and the other connecting wire 220 is connected to the other end of the resistance wire 210. The resistance wire 210 is inserted into the magnesium oxide positioning rod 300 in the disc segment 110, and the connecting wire 220 is inserted into the magnesium oxide positioning rod 300 in the connecting segment 120. A magnesium powder filling layer 130 is provided in the outer tube body 100, and the magnesium powder filling layer 130 is located in the gap between the magnesium positioning plate and the inner wall of the outer tube body 100, and the magnesium powder filling layer 130 is composed of high-temperature magnesium powder.

[0041] Reference Figure 6 and Figure 7 The end of the magnesium oxide positioning rod 300 away from the opening 121 is covered with a protective cover 330. The magnesium oxide positioning rod 300 includes a plurality of rod bodies 340. The rod bodies 340 are high-temperature magnesium rods. The length direction of the rod bodies 340 is consistent with the length direction of the outer tube body 100, and the plurality of rod bodies 340 are sequentially distributed along the length direction of the outer tube body 100. A groove 341 is provided at one end of the rod body 340 close to the opening 121. The groove 341 is annularly arranged, and the circumference of the groove 341 is consistent with the circumference of the rod body 340. A protrusion 342 is connected to the other end of the rod body 340. The protrusion 342 is annularly arranged, and the circumference of the protrusion 342 is consistent with the circumference of the rod body 340. Two adjacent rod bodies 340 are clamped with the groove 341 through the protrusion 342, and the protrusion 342 of the previous rod body 340 is embedded in the groove 341 of the next rod body 340.

[0042] Reference Figure 4 The sealing cover 400 includes a cylinder 410 and a top cover 420 connected to the cylinder 410. The length direction of the cylinder 410 is consistent with the vertical direction. The top cover 420 is connected to the top of the cylinder 410. The cylinder 410 is embedded in the opening 121, and the outer tube 100 is sleeved on the top of the cylinder 410. The bottom of the top cover 420 contacts the top of the outer tube 100. The sealing cover 400 is provided with two connection holes 430 for the connection wire 220 to pass through. The length direction of the connection hole 430 is consistent with the vertical direction. The top of the sealing cover 400 is connected with a protective cover 440. There are two protective covers 440, and one protective cover 440 is connected to one connection hole 430. The protective cover 440 is sleeved on the connection wire. The cylinder 410 is sleeved with a sealing ring 411, and the sealing ring 411 is used to seal the gap between the cylinder 410 and the inner wall of the outer tube 100.

[0043] The implementation principle of a heating coil in the embodiment of the present application is as follows: during the production process, the heating wire 200 passes through the first through hole 310 and the second through hole 320 in sequence, so that the resistance wire 210 is passed through the rod 340 located in the disc segment 110, and the connecting wire 220 is passed through the rod 340 located in the connecting segment 120, so that both ends of the heating wire 200 pass through the opening 121 and are arranged outside the outer tube body 100, so that one end of the outer tube body 100 is closed, thereby reducing the occupied space of a heating coil and facilitating the installation of the embodiment. The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A heating coil, characterized in that: The invention comprises an outer tube body (100), a heating wire (200), a magnesium oxide positioning rod (300), and a sealing cover (400), wherein the outer tube body (100) comprises a disc segment (110) and a connecting segment (120), wherein the disc segment (110) is connected to the connecting segment (120), and an end of the disc segment (110) away from the connecting segment (120) is closed, and an end of the connecting segment (120) away from the disc segment (110) is provided with an opening (121), and the sealing cover (400) is used to seal the opening (121), and the magnesium oxide positioning rod (300) is inserted into the outer tube body (100), and the magnesium oxide positioning rod (300) is provided with an axially extending A first through hole (310) and a second through hole (320) are provided, one end of the heating wire (200) passes through the first through hole (310) and the second through hole (320) in sequence, the heating wire (200) comprises a resistance wire (210) and connecting wires (220) connected to both ends of the resistance wire (210), the resistance wire (210) passes through a magnesium oxide positioning rod (300) located in the disc section (110), the connecting wire (220) passes through a magnesium oxide positioning rod (300) located in the connecting section (120), and the ends of the two connecting wires (220) away from the resistance wire (210) pass through the sealing cover (400).

2. A heating coil according to claim 1, characterized in that: The magnesium oxide positioning rod (300) comprises a plurality of rod bodies (340), and the plurality of rod bodies (340) are distributed in sequence along the length direction of the outer tube body (100).

3. A heating coil according to claim 2, characterized in that: A groove (341) is provided at one end of the rod body (340) close to the opening (121), and the length direction of the groove (341) is consistent with the circumference of the rod body (340). A protrusion (342) is connected to the other end of the rod body (340), and the length direction of the protrusion (342) is consistent with the circumference of the rod body (340). Two adjacent rod bodies (340) are clamped with the groove (341) via the protrusion (342).

4. A heating coil according to claim 2, characterized in that: One end of the magnesium oxide positioning rod (300) away from the opening (121) is connected to a protective cover (330).

5. The heating coil according to claim 1, characterized in that: A magnesium powder filling layer (130) is provided in the gap between the magnesium oxide positioning rod (300) and the inner wall of the outer tube body (100).

6. A heating coil according to claim 1, characterized in that: The sealing cover (400) comprises a cylinder (410) and a top cover (420); the length direction of the cylinder (410) is consistent with the length direction of the connecting section (120); one end of the outer tube body (100) is sleeved on the cylinder (410); the top cover (420) is connected to an end of the cylinder (410) away from the outer tube body (100); the side of the top cover (420) close to the cylinder (410) is in contact with the outer tube body (100); and the sealing cover (400) is provided with two connection holes (430) for connecting wires (220) to pass through.

7. A heating coil according to claim 6, characterized in that: The cylinder (410) is sleeved with a sealing ring (411), and the sealing ring (411) is used to seal the gap between the cylinder (410) and the inner wall of the outer tube body (100).

8. A heating coil according to claim 7, characterized in that: One end of the sealing cover (400) away from the outer tube body (100) is connected to a protective sleeve (440), and the protective sleeve (440) is sleeved on a connecting wire located outside the outer tube body (100).

9. The heating coil according to claim 1, characterized in that: The disc segment (110) is arranged in a planar spiral shape.

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