Heating frame

Abstract

The utility model relates to a heating frame which comprises a plurality of mica fixing plates, the mica fixing plates are movably connected, the mica fixing plates are provided with a plurality of clamping grooves and are connected with spiral resistance wires through the clamping grooves, and the width of the clamping grooves is larger than the spiral outer diameter of the spiral resistance wires. The thickness of the mica fixing plate is larger than the pitch of the spiral resistance wire, a heat insulation barrel is arranged on the outer side of the mica fixing plate, and a bent part inclining inwards is arranged at one end of the heat insulation barrel. The clamping groove is formed in the mica fixing plate, the width of the clamping groove is larger than the spiral outer diameter of the spiral resistance wire, the whole spiral resistance wire can be placed in the clamping groove, and stable supporting is guaranteed; the thickness of the mica fixing plate is larger than the pitch of the spiral resistance wire, the spiral resistance wire is prevented from being clamped into the mica fixing plate, the contact position between the spiral resistance wire and the mica fixing plate is prevented from being broken due to a stress passage, and the use effect is guaranteed; the heat insulation cylinder on the outer side of the mica fixing plate is provided with the bending part, so that connection and installation are facilitated.

Description

Technical Field

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

[0002] The heating frame, also called the heating core, is generally made of nickel-chromium resistance wire wound on a high-temperature resistant mica fixing plate. It is usually used in small household appliances such as hair dryers, milk heaters or popcorn machines. The main structure of the heating frame is the mica fixing plate and the resistance wire wrapped around the mica fixing plate. The two ends of the resistance wire are connected to the power supply. The outer side of the heating frame is equipped with an insulation tube for protection and to concentrate the heat at the same time.

[0003] In order to ensure the heating efficiency, the heating frame usually uses a wire winding machine to wind the resistance wire into a spiral shape or process a U-shaped or V-shaped groove on the resistance wire. At the same time, a groove is set on the mica fixing plate, and the groove is fixed by clamping. Low-power heating frames mostly adopt a spiral structure. At present, the mica fixing plates of the heating frames on the market are mostly vertically cross-arranged, and the outer edge of the mica fixing plate is provided with a groove. The resistance wire is wound and clamped in the groove. Since the resistance wire will become soft and deformed while heating, it may cause the resistance wire to fall off, affecting the use effect.

[0004] There are some heating racks in the prior art that can limit resistance wires. For example, a Chinese patent with authorization announcement number CN211739472U and publication date October 23, 2020 discloses a heating device, including a base plate; a fixed plate, on which a plurality of fixed plates extending outward are radially arranged; a heating wire, on which a spiral heating wire is hung; a fixed groove, on which a fixed groove is arranged, and the heating wire passes through all the fixed grooves in turn and is wound around the base plate into multiple turns; a support rope is passed through the heating wire, or the support rope provides a suspension force according to the drooping state of the heating wire during installation and use, so as to ensure that the two heating wires do not contact each other, and the heating wires between adjacent fixed plates are located in the same plane.

[0005] In the above, by arranging a support rope at the center of the heating wire and the support rope is in a taut state, the heating wire can be supported. At the same time, a fixing groove is provided, and a vertical channel and an arc channel are provided in the fixing groove to facilitate the insertion of the heating wire. With respect to the above-mentioned related technologies, the inventor believes that the heating wire in the application is fixed by tightening the support rope, and at the same time the heating wire is clamped in the fixing groove. The tension at the junction of the heating wire and the fixing groove is relatively large, but long-term use may cause the heating wire to fall off, and in severe cases may cause the heating wire to break directly, affecting the use; at the same time, the heating device in the application has a complex structure and is inconvenient to install, so it is necessary to design a heating rack with stable and convenient installation of the resistance wire. Utility Model Content

[0006] The present application provides a heating rack with a resistance wire that can be stably and conveniently installed.

[0007] The heating rack provided in this application adopts the following technical solution:

[0008] A heating frame comprises a mica fixing plate, wherein the mica fixing plates are multiple and movably connected to each other, the mica fixing plate is provided with multiple slots and a spiral resistance wire is connected through the slots, the width of the slots is greater than the spiral outer diameter of the spiral resistance wire, the thickness of the mica fixing plate is greater than the pitch of the spiral resistance wire, an insulation tube is provided on the outer side of the mica fixing plate, and one end of the insulation tube is provided with a bending portion inclined inwardly.

[0009] Preferably, the mica fixing plates are three rectangular plate-like structures, the angle between adjacent mica fixing plates is 60 degrees, a connecting groove is provided in the middle of the mica fixing plates and adjacent mica fixing plates are connected to each other through the connecting groove, and the positions of the connecting grooves on different mica fixing plates are different.

[0010] Preferably, the connection grooves are arranged at the middle upper end, the middle lower end and the middle position of the mica fixing plate.

[0011] Preferably, the upper and lower ends of the mica fixing plate are both provided with fixing plates, a plurality of grooves are evenly arranged circumferentially on the fixing plates and the inner sides of the grooves are connected to the ends of the mica fixing plate, and the width of the grooves corresponds to the thickness of the mica fixing plate.

[0012] Preferably, the card slot includes a first card slot and a second card slot, and the first card slot and the second card slot are respectively arranged at the upper and lower ends and the left and right sides of the mica fixing plate, and the first card slot includes a vertical section and a horizontal section, the horizontal section is located at the end of the vertical section and is arranged toward the center of the mica fixing plate, and the horizontal sections of the first card slot at the upper and lower ends of the mica fixing plate are arranged close to each other.

[0013] Preferably, there are multiple first card slots and multiple second card slots, and the connection between the vertical section and the horizontal section of the first card slot is provided with a rounded corner.

[0014] Preferably, the second slot is an inclined slot and the inclination direction of the second slot is toward the center of the mica fixing plate.

[0015] Preferably, the mica fixing plate is provided with a mounting hole, a connecting ring is provided in the mounting hole, and a thermistor, a fuse, a temperature control switch and a connecting wire are connected through the connecting ring, and the thermistor, the fuse and the temperature control switch are all connected between two adjacent mica fixing plates.

[0016] In summary, the present application includes at least one of the following beneficial technical effects of the heating rack:

[0017] 1. Please set a slot on the mica fixing plate and connect the spiral resistance wire through the slot to facilitate connection. At the same time, set the width of the slot to be larger than the spiral outer diameter of the spiral resistance wire, so that the entire spiral resistance wire can be placed in the slot. Set the rear end of the mica fixing plate to be larger than the pitch of the spiral resistance wire to avoid the spiral resistance wire from being stuck in the mica fixing plate, resulting in excessive force on the contact point between the resistance wire and the mica fixing plate, thereby avoiding the spiral resistance wire from breaking. At the same time, the thickness of the mica fixing plate is larger than the pitch of the spiral resistance wire. Even when the resistance wire is deformed by heat, the resistance wire can move in the slot to avoid the resistance wire from breaking. By setting an insulation tube on the outside of the mica fixing plate and a bending portion at one end of the insulation tube, the bending portion can block the mica fixing plate to facilitate installation.

[0018] 2. By setting a connection groove in the middle of the mica fixing plate and the connection grooves on different mica plates are at different positions, it is convenient to connect and fix; at the same time, fixing plates are set at the upper and lower ends of the mica fixing plate, and the grooves on the fixing plates can be connected with the mica fixing plate to ensure the supporting effect of the mica fixing plate and facilitate use.

[0019] 3. By setting the first slot and the second slot on the upper and lower parts and the left and right parts of the mica fixing plate respectively, the spiral resistance wire can be fixed conveniently. At the same time, a vertical section and a horizontal section are set on the first slot. The spiral resistance wire can be inserted into the horizontal section during installation to prevent it from loosening and ensure a stable connection. By setting the second slot tilted downward, the spiral resistance wire can be prevented from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the heating frame in a preferred embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the structure of the mica fixing plate in the preferred embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the structure of the fixing plate in a preferred embodiment of the present application.

[0023] Explanation of the reference numerals: 1. mica fixing plate; 101. slot; 101a. first slot; 101b. second slot; 102. connecting slot; 103. mounting hole; 2. spiral resistance wire; 3. heat insulation tube; 301. bending portion; 4. fixing plate. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings.

[0025] The embodiment of the present application discloses a heating rack.

[0026] Reference Figures 1 to 3A heating rack includes a mica fixing plate 1, wherein the mica fixing plate 1 is a plurality of mica fixing plates 1 and the plurality of mica fixing plates 1 are movably connected to each other. Specifically, the mica fixing plate 1 includes three rectangular plate-like structures, and the angle between adjacent mica fixing plates 1 is 60 degrees. A connecting groove 102 is provided in the middle of the mica fixing plate 1, and adjacent mica fixing plates 1 are connected to each other through the connecting groove 102. The positions of the connecting grooves 102 on different mica fixing plates 1 are different, and the connecting grooves 102 are respectively provided at the middle upper end, the middle lower end and the middle position of the mica fixing plate 1.

[0027] Reference Figure 2 , a plurality of slots 101 are provided on the mica fixing plate 1 and a spiral resistance wire 2 is connected through the slots 101. Specifically, the slots 101 include a plurality of first slots 101a and a plurality of second slots 101b. The first slots 101a and the second slots 101b are respectively arranged at the upper and lower ends and the left and right sides of the mica fixing plate 1. The first slot 101a includes a vertical section and a horizontal section, and a fillet is arranged at the connection between the vertical section and the horizontal section. The horizontal section is located at the end of the vertical section and the horizontal section is arranged toward the center of the mica fixing plate 1. The horizontal sections of the first slots 101a at the upper and lower ends of the mica fixing plate 1 are arranged close to each other, and the second slots 101b are arranged to be inclined downward. The widths of the first slots 101a and the second slots 101b are both greater than the spiral outer diameter of the spiral resistance wire 2. The thickness of the mica fixing plate 1 is greater than the pitch of the spiral resistance wire 2. An insulation tube 3 is arranged on the outer side of the mica fixing plate 1, and an inwardly inclined bending portion 301 is arranged at one end of the insulation tube 3.

[0028] Reference Figure 1 and Figure 3 A fixing sheet 4 is provided at the upper and lower ends of the mica fixing plate 1. A plurality of grooves are evenly arranged circumferentially on the fixing sheet 4 and the inner side of the groove is connected to the end of the mica fixing plate 1. The width of the groove corresponds to the thickness of the mica fixing plate 1.

[0029] Reference Figure 1 and Figure 2 A mounting hole 103 is provided on the mica fixing plate 1, a connecting ring is provided in the mounting hole 103, and a thermistor, a fuse, a temperature control switch and a connecting wire are connected through the connecting ring. The thermistor, the fuse and the temperature control switch are all connected between two adjacent mica fixing plates 1. Specifically, the mounting hole 103 in this example is located at the lower part of the mica fixing plate 1. During installation, the upper part of the mica fixing plate 1 is connected to the inner side of the bending portion 301.

[0030] The implementation principle is: during the processing and manufacturing of this embodiment, it is necessary to first plug and fix multiple mica fixing plates 1 with each other, and then the staff connects the spiral resistance wire 2 to the mica fixing plate 1 through the first slot 101a and the second slot 101b, and finally install the thermistor, fuse, temperature control switch and connecting wire into the installation hole 103 of the mica fixing plate 1, and finally push the installed mica fixing plate 1 as a whole into the insulation tube 4. The bending part at the end of the insulation tube 4 can limit the position of the log fixing plate 1, which is convenient for installation.

[0031] When the present application is in use, the spiral resistance wire 3 heats up and deforms after being energized for a long time. Since the thickness of the mica fixing plate 1 is greater than the pitch of the spiral resistance wire 2, the threaded portion of the spiral resistance wire 2 will not be stuck in the mica fixing plate 1, and the spiral resistance wire 2 can move on the mica fixing plate 1 to avoid the spiral resistance wire 2 from breaking. At the same time, due to the direction and angle settings of the first slot 101a and the second slot 101b, the spiral resistance wire 3 can be stably supported in the slot 101 even if it heats up and deforms, thereby ensuring the use effect.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heating rack, characterized in that: The invention comprises a mica fixing plate (1), wherein the mica fixing plate (1) is composed of a plurality of mica fixing plates (1) and the plurality of mica fixing plates (1) are movably connected to each other, a plurality of slots (101) are provided on the mica fixing plate (1) and a spiral resistance wire (2) is connected via the slots (101), the width of the slots (101) is greater than the spiral outer diameter of the spiral resistance wire (2), the thickness of the mica fixing plate (1) is greater than the pitch of the spiral resistance wire (2), an insulation tube (3) is provided on the outer side of the mica fixing plate (1), and one end of the insulation tube (3) is provided with a bent portion (301) inclined inwardly.

2. A heating rack according to claim 1, characterized in that: The mica fixing plates (1) are three rectangular plate-shaped structures, the angle between adjacent mica fixing plates (1) is 60 degrees, a connecting groove (102) is provided in the middle of the mica fixing plates (1), and adjacent mica fixing plates (1) are mutually clamped via the connecting groove (102), and the connecting grooves (102) on different mica fixing plates (1) are at different positions.

3. A heating rack according to claim 2, characterized in that: The connection grooves (102) are arranged at the middle upper end, the middle lower end and the middle position of the mica fixing plate (1).

4. A heating rack according to claim 1, characterized in that: The upper and lower ends of the mica fixing plate (1) are both provided with fixing plates (4), a plurality of grooves are evenly arranged circumferentially on the fixing plate (4), and the inner sides of the grooves are connected to the ends of the mica fixing plate (1), and the width of the grooves corresponds to the thickness of the mica fixing plate (1).

5. The heating rack according to claim 1, characterized in that: The card slot (101) comprises a first card slot (101a) and a second card slot (101b), the first card slot (101a) and the second card slot (101b) are respectively arranged at the upper and lower ends and the left and right sides of the mica fixing plate (1), the first card slot (101a) comprises a vertical section and a horizontal section, the horizontal section is located at the end of the vertical section and is arranged toward the center of the mica fixing plate (1), and the horizontal sections of the first card slot (101a) at the upper and lower ends of the mica fixing plate (1) are arranged close to each other.

6. A heating rack according to claim 5, characterized in that: There are multiple first card slots (101a) and multiple second card slots (101b), and the connection between the vertical section and the horizontal section of the first card slot (101a) is provided with a rounded corner.

7. The heating rack according to claim 5, characterized in that: The second card slot (101b) is arranged to be inclined downward.

8. The heating rack according to claim 1, characterized in that: The mica fixing plate (1) is provided with a mounting hole (103), a connecting ring is provided in the mounting hole (103), and a thermistor, a fuse, a temperature control switch and a connecting wire are connected via the connecting ring, and the thermistor, the fuse and the temperature control switch are all connected between two adjacent mica fixing plates (1).

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