Double-voltage wire winding heating tube and electric heater

Abstract

The utility model discloses a double-voltage wire winding heating tube and an electric heater. The double-voltage wire winding heating tube comprises a tube body, a heating wire is arranged on the peripheral wall of the pipe body; the heating wire is spirally wound on the peripheral wall of the pipe body from one end of the pipe body to the other end of the pipe body by taking the axis of the pipe body as the center; a first conductive terminal electrically connected with one end of the heating wire is arranged at one end of the tube body; a second conductive terminal electrically connected with the other end of the heating wire is arranged at the other end of the tube body; a third conductive terminal electrically connected with the middle part of the heating wire is arranged in the middle part of the tube body, so that a first resistance value of the heating wire between the first conductive terminal and the third conductive terminal is equal to a second resistance value of the heating wire between the second conductive terminal and the third conductive terminal; the same heating wire is shared under the scene that the voltage is two times, the heating effect of the same heating power and power density is achieved, the space occupation of the heating wire is effectively reduced, the manufacturing cost is reduced, and the utilization rate is higher.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a dual-voltage wire-wound heating tube and an electric heater. Background Technology

[0002] To accommodate applications requiring different voltages, existing wire-wound heating tubes typically have multiple heating wire segments on the outer wall of the tube. Each segment is connected to a different voltage, so during operation, the corresponding segment is energized and heats up, while the remaining segments are idle. This results in higher manufacturing costs, larger heating wire footprint, and lower wire utilization. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a dual-voltage wire-wound heating tube and electric heater. In scenarios where the voltage is twice that of the heating element, the same heating wire is used to achieve the same heating power and power density, effectively reducing the space occupied by the heating wire, lowering manufacturing costs, and increasing utilization.

[0004] To achieve the above objectives, the specific solution of this utility model is as follows:

[0005] On the one hand, this utility model provides a dual-voltage wire-wound heating tube, including a tube body; a heating wire is provided on the outer peripheral wall of the tube body; the heating wire is spirally wound on the outer peripheral wall of the tube body from one end of the tube body to the other end of the tube body with the axis of the tube body as the center;

[0006] One end of the tube is provided with a first conductive terminal electrically connected to one end of the heating wire; the other end of the tube is provided with a second conductive terminal electrically connected to the other end of the heating wire; the middle part of the tube is provided with a third conductive terminal electrically connected to the middle part of the heating wire, such that the first resistance value of the heating wire located between the first conductive terminal and the third conductive terminal is equal to the second resistance value of the heating wire located between the second conductive terminal and the third conductive terminal.

[0007] Furthermore, in this invention, the heating wire has a flat structure.

[0008] Furthermore, in this invention, the heating wire is made of an iron-chromium-aluminum alloy or a nickel-chromium alloy.

[0009] Furthermore, the first conductive terminal, the second conductive terminal, and the third conductive terminal have the same structure, and all three include a conductive locking ring and a locking assembly; the conductive locking ring is an open-loop structure; the conductive locking ring is clamped to the outer wall of the heating wire and electrically connected to the heating wire; the locking assembly is connected to both ends of the conductive locking ring, so that the conductive locking ring clamps the heating wire.

[0010] In a further embodiment of the present invention, the locking assembly includes a first locking member and a second locking member; one end of the conductive locking ring extends to a first connecting portion; the first connecting portion is provided with a first locking hole; the other end of the conductive locking ring extends to a second connecting portion; the second connecting portion is provided with a second locking hole; the first locking member passes through the first locking hole and the second locking hole; the second locking member is connected to the first locking member and fixes the first connecting portion and the second connecting portion.

[0011] Furthermore, in this invention, the length of the first connecting portion is less than the length of the second connecting portion.

[0012] In a further embodiment of this invention, the first locking element is a screw or stud; the second locking element is a nut.

[0013] Furthermore, in this invention, when the first voltage is applied, the first conductive terminal and the second conductive terminal are connected to the first voltage, while the third conductive terminal is left unconnected.

[0014] When the second voltage is applied, the first conductive terminal and the second conductive terminal are short-circuited and then connected to the third conductive terminal to apply the second voltage. The voltage amplitude of the first voltage is twice the voltage amplitude of the second voltage.

[0015] Furthermore, the outer peripheral wall of the tube body is provided with an insulating layer.

[0016] On the other hand, this utility model also provides an electric heater, including the dual-voltage wire-wound heating tube as described above.

[0017] The beneficial effects of this utility model are as follows: By spirally winding the heating wire around the outer peripheral wall of the tube, and setting a first conductive terminal and a second conductive terminal at both ends of the heating wire, and setting a third conductive terminal in the middle of the heating wire, the same heating wire can be used in scenarios where the voltage is twice that of the tube. This allows the heating wire to be fully utilized and achieves the same heating power and power density. It also effectively reduces the space occupied by the heating wire, lowers the manufacturing cost, and increases the utilization rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the heating wire wound on the tube body according to this utility model;

[0020] Figure 3 This is an exploded view of the first conductive terminal, the second conductive terminal, or the third conductive terminal of this utility model;

[0021] Explanation of reference numerals in the attached drawings: 1. Tube body; 11. Positioning notch; 2. Heating wire; 3. First conductive terminal; 4. Second conductive terminal; 5. Third conductive terminal; 6. Conductive locking ring; 61. First connecting part; 62. Second connecting part; 63. First locking hole; 64. Second locking hole; 71. First locking member; 72. Second locking member; 73. Buffer pad; 8. First insulating layer. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the present invention.

[0023] like Figures 1 to 3 As shown in this embodiment, a dual-voltage wound wire heating tube is suitable for scenarios where the voltage is twice that of the heating wire, such as 110V and 220V, 12V and 24V, etc. In this scenario, the heating wire 2 has the same power consumption, power density, and utilization rate. The dual-voltage wound wire heating tube includes a tube body 1; a heating wire 2 is provided on the outer peripheral wall of the tube body 1; the heating wire 2 is spirally wound around the outer peripheral wall of the tube body 1 from one end to the other end of the tube body 1 with the axis of the tube body 1 as the center; a first conductive terminal 3 is provided at one end of the tube body 1 and electrically connected to one end of the heating wire 2; a second conductive terminal 4 is provided at the other end of the tube body 1 and electrically connected to the other end of the heating wire 2; a third conductive terminal 5 is provided in the middle of the tube body 1 and electrically connected to the middle of the heating wire 2, such that the first resistance value of the heating wire 2 located between the first conductive terminal 3 and the third conductive terminal 5 is equal to the second resistance value of the heating wire 2 located between the second conductive terminal 4 and the third conductive terminal 5. Assuming the resistance of the heating wire 2 is 2R, then both the first resistance value and the second resistance value are R.

[0024] Specifically, in practical applications, if the actual voltage used is the first voltage VH, such as 220V or 24V, then the first conductive terminal 3 and the second conductive terminal 4 are connected to the first voltage, and the third conductive terminal 5 is left floating. In this case, the entire heating wire 2 is connected in series in the circuit, and the heating power PH = VH * VH / 2R. If the actual voltage used is the second voltage VL, such as 110V or 12V, then the first conductive terminal 3 and the second conductive terminal 4 are short-circuited, and then connected to the second voltage along with the third conductive terminal 5. In this case, the heating wire 2 is divided into two equal parts, and the resistance of the heating wire 2 in the circuit is 1 / 2R. The heating power of the heating wire 2 is PL = 2 * VL * VL / R. Since VL = 1 / 2VH, it can be seen that when the voltage amplitude of the first voltage is twice the voltage amplitude of the second voltage, the heating wire 2 can achieve the same power consumption, utilization rate, and power density.

[0025] In this embodiment, a heating wire 2 is spirally wound around the outer peripheral wall of the tube body 1, and a first conductive terminal 3 and a second conductive terminal 4 are respectively provided at both ends of the heating wire 2, and a third conductive terminal 5 is provided in the middle of the heating wire 2. Thus, the same heating wire 2 can be used in a scenario where the voltage is twice that of the tube body 1, so that the heating wire 2 can be fully utilized and the same heating power and power density can be achieved. This effectively reduces the space occupied by the heating wire 2, reduces the manufacturing cost, and increases the utilization rate.

[0026] like Figure 1 and Figure 2 As shown, in some embodiments of the dual-voltage wire-wound heating tube of this embodiment, the heating wire 2 has a flat structure; this arrangement allows the heating wire 2 to effectively adhere to the surface of the tube body 1, resulting in a larger contact area, improved heating efficiency, and a more secure winding of the heating wire 2.

[0027] In this embodiment of the dual-voltage wound wire heating tube, preferably, the heating wire 2 is made of iron-chromium-aluminum alloy or nickel-chromium alloy, which is resistant to high temperature and has a longer service life.

[0028] like Figure 1 and Figure 3 As shown, in some embodiments of the dual-voltage wire-wound heating tube of this embodiment, the first conductive terminal 3, the second conductive terminal 4, and the third conductive terminal 5 have the same structure, and all three include a conductive locking ring 6 and a locking assembly; the conductive locking ring 6 has an open-loop structure; the conductive locking ring 6 is clamped to the outer wall of the heating wire 2 and electrically connected to the heating wire 2; the locking assembly is connected to both ends of the conductive locking ring 6, so that the conductive locking ring 6 clamps the heating wire 2.

[0029] In actual manufacturing, the heating wire 2 is wound around the outer peripheral wall of the tube body 1. Then, the conductive locking ring 6 is fitted onto the outer wall of the heating wire 2, and the two ends of the conductive locking ring 6 are fixedly connected using a locking assembly. This ensures that the conductive locking ring 6 firmly holds the heating wire 2, making it reliably wound around the outer peripheral wall of the tube body 1 and preventing it from easily loosening. Furthermore, the conductive locking ring 6 provides electrical conductivity to the heating wire 2. The connection method of the first conductive terminal 3, the second conductive terminal 4, and the third conductive terminal 5 is selected according to the voltage of the specific application scenario. In this embodiment, the heating wire 2 is fixed and electrically connected using the conductive locking ring 6 and the locking assembly, facilitating the assembly and disassembly of the heating wire 2.

[0030] like Figure 1 and Figure 3As shown, in some embodiments of the dual-voltage wire-wound heating tube of this embodiment, the locking assembly includes a first locking member 71 and a second locking member 72; one end of the conductive locking ring 6 extends to a first connecting portion 61; the first connecting portion 61 is provided with a first locking hole 63; the other end of the conductive locking ring 6 extends to a second connecting portion 62; the second connecting portion 62 is provided with a second locking hole 64; the first locking member 71 passes through the first locking hole 63 and the second locking hole 64; the second locking member 72 is connected to the first locking member 71, and fixes the first connecting portion 61 and the second connecting portion 62. Preferably, in this embodiment of the dual-voltage wire-wound heating tube, the first locking member 71 is a screw or stud; the second locking member 72 is a nut.

[0031] Specifically, during manufacturing, screws or studs are passed through the second locking hole 64 and the first locking hole 63 in sequence, and then nuts are screwed onto the studs or screws, so that the first connecting part 61 and the second connecting part 62 are tightened, thereby making the conductive locking clamp on the tube body 1, thus fixing the heating wire 2 and making disassembly and assembly convenient.

[0032] like Figure 3 As shown, in some embodiments of the dual-voltage wire-wound heating tube of this embodiment, at least one buffer washer 73 is provided on the screw or stud; preferably, there are two buffer washer 73s. This arrangement further improves the reliability of the connection between the screw or stud and the nut.

[0033] like Figure 3 As shown, in some embodiments of the dual-voltage wire-wound heating tube of this embodiment, the length of the first connecting portion 61 is shorter than the length of the second connecting portion 62. This arrangement allows the conductive locking ring 6 to be electrically connected to an external power source through the end of the second connecting portion 62.

[0034] like Figure 1 and Figure 2 As shown, in some embodiments of the dual-voltage wound wire heating tube, the outer peripheral wall of the tube body 1 is provided with a first insulating layer 8. This embodiment ensures insulation between the heating wire 2 and the tube body 1 by providing the first insulating layer 8, making the structure safer to use.

[0035] It should be noted that if the tube body 1 is made of metal, a first insulating layer 8 needs to be provided on the outer circumference of the tube body 1; if the tube body 1 is made of non-metallic material, a first insulating layer 8 may or may not be provided on the outer circumference of the tube body 1, depending on the actual usage requirements.

[0036] Preferably, the outer peripheral wall of the tube body 1 is also provided with a second insulating layer (not shown in the figure) covering the heating wire 2, so as to ensure the insulation of the heating wire 2 during use, avoid accidental contact with the energized heating wire 2 and cause electric shock, and further improve the safety of the structure.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments of the dual-voltage wound wire heating tube, a positioning notch 11 is provided at one end of the tube body 1. In this embodiment, the positioning notch 11 makes it easier to offset the open end of the conductive locking ring 6 from the wire end of the heating wire 2 by using the positioning notch 11 as a reference, so that the conductive locking ring 6 can reliably hold the wire end of the heating wire 2.

[0038] like Figures 1 to 3 As shown, this embodiment of the present invention also provides an electric heater, including a dual-voltage wire-wound heating tube as described in the above embodiment. This embodiment, by employing the dual-voltage wire-wound heating tube of the above embodiment, possesses all the beneficial effects of the aforementioned dual-voltage wire-wound heating tube, which will not be elaborated further here.

[0039] The above description is only a preferred embodiment of the present utility model. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included within the protection scope of the present utility model patent application.

Claims

1. A dual-voltage wire-wound heating tube, characterized in that, Includes a tube body; the outer peripheral wall of the tube body is provided with a heating wire; the heating wire is spirally wound around the outer peripheral wall of the tube body from one end of the tube body to the other end of the tube body with the axis of the tube body as the center; One end of the tube is provided with a first conductive terminal electrically connected to one end of the heating wire; the other end of the tube is provided with a second conductive terminal electrically connected to the other end of the heating wire; the middle part of the tube is provided with a third conductive terminal electrically connected to the middle part of the heating wire, such that the first resistance value of the heating wire located between the first conductive terminal and the third conductive terminal is equal to the second resistance value of the heating wire located between the second conductive terminal and the third conductive terminal.

2. The dual-voltage wire-wound heating tube according to claim 1, characterized in that, The heating wire has a flat structure.

3. A dual-voltage wire-wound heating tube according to claim 1, characterized in that, The heating wire is made of iron-chromium-aluminum alloy or nickel-chromium alloy.

4. A dual-voltage wire-wound heating tube according to claim 1, characterized in that, The first conductive terminal, the second conductive terminal, and the third conductive terminal have the same structure, and all three include a conductive locking ring and a locking assembly. The conductive locking ring is an open-loop structure. The conductive locking ring is clamped to the outer wall of the heating wire and electrically connected to the heating wire. The locking assembly is connected to both ends of the conductive locking ring, so that the conductive locking ring clamps the heating wire.

5. A dual-voltage wire-wound heating tube according to claim 4, characterized in that, The locking assembly includes a first locking member and a second locking member; one end of the conductive locking ring extends to a first connecting portion; the first connecting portion is provided with a first locking hole; the other end of the conductive locking ring extends to a second connecting portion; the second connecting portion is provided with a second locking hole; the first locking member passes through the first locking hole and the second locking hole; the second locking member is connected to the first locking member and fixes the first connecting portion and the second connecting portion.

6. A dual-voltage wire-wound heating tube according to claim 5, characterized in that, The length of the first connecting part is less than the length of the second connecting part.

7. A dual-voltage wire-wound heating tube according to claim 5, characterized in that, The first locking element is a screw or stud; the second locking element is a nut.

8. A dual-voltage wire-wound heating tube according to claim 1, characterized in that, When the first voltage is applied, the first and second conductive terminals are connected to the first voltage, while the third conductive terminal is left floating. When the second voltage is applied, the first conductive terminal and the second conductive terminal are short-circuited and then connected to the third conductive terminal to apply the second voltage. The voltage amplitude of the first voltage is twice the voltage amplitude of the second voltage.

9. A dual-voltage wire-wound heating tube according to claim 1, characterized in that, The outer peripheral wall of the tube is provided with an insulating layer.

10. An electric heater, characterized in that, Including the dual-voltage wire-wound heating tube as described in any one of claims 1 to 9.

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