High-safety heating rack

Abstract

The utility model provides a kind of high security heating frame, including support and main heating wire, the main heating wire is wound on the support, the support is also provided with thyristor and secondary heating wire, the secondary heating wire one end with the thyristor conduction, another end then with the main heating wire conduction, wherein, the diameter of the secondary heating wire is less than the diameter of the main heating wire, so that the input voltage is too high, the secondary heating wire is fused quickly, to prevent the main heating wire overheating and fuse, if control module fails when high voltage input selects low voltage thyristor conduction, and the secondary heating wire connected with low voltage thyristor conduction is fused quickly, avoid high voltage impact main heating wire to make main heating wire melt and be blown out by the fan of hair dryer, cause the problem of scalding user, improve the use safety of hair dryer.

Description

Technical Field

[0001] This utility model belongs to the field of hair dryer heating holders, specifically relating to a high-safety heating holder. Background Technology

[0002] A hair dryer is an electric heating appliance used for drying or styling hair. A motor drives the fan blades to rotate, drawing air in through the air inlet. After being heated by the heating wire, hot air is blown out from the outlet. Because different countries or regions have different power grid standard voltages, such as 100V or 220V, existing dual-pressure hair dryers are equipped with at least two heating wire control circuits. Each circuit is controlled by an independent SCR (Silicon Controlled Rectifier). The control module actively identifies the input power voltage and automatically switches to the corresponding SCR control based on the voltage level, achieving automatic circuit switching. This allows the heating wire to adapt to different power voltages, effectively improving the hair dryer's voltage compatibility and user-friendly operation.

[0003] However, existing hair dryers lack a protection mechanism for the heating element. When the control module malfunctions and fails to switch the circuit or incorrectly switches to a low-voltage circuit, if a high-voltage power supply is input, the heating element will become severely red-hot and melt quickly, accompanied by molten metal being ejected, posing a significant safety hazard. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] This invention provides a highly safe heating element, which aims to solve the problem that existing hair dryers lack a protection mechanism for the heating wire, causing the heating wire to melt and burn the user when high voltage is input.

[0006] (2) Technical solution

[0007] This utility model provides a high-safety heating frame, including a support and a main heating wire. The main heating wire is wound around the support. The support is also provided with a thyristor and a secondary heating wire. One end of the secondary heating wire is connected to the thyristor, and the other end is connected to the main heating wire.

[0008] The diameter of the secondary heating wire is smaller than that of the main heating wire, so that when the input voltage is too high, the secondary heating wire melts quickly to prevent the main heating wire from overheating and melting.

[0009] Preferably, the diameter of the secondary heating wire is 30%-80% of the diameter of the main heating wire.

[0010] Preferably, the diameter of the main heating wire is 0.1mm-0.6mm.

[0011] Preferably, the length of the secondary heating wire is 5mm-20mm.

[0012] Preferably, the main heating wire and the secondary heating wire are made of the same material.

[0013] Preferably, one end of the bracket is an air inlet and the other end is an air outlet, and the secondary heating wire is disposed on the side close to the air inlet.

[0014] Preferably, the bracket has a central axis P, and the secondary heating wire is disposed inside the main heating wire and on the side close to the central axis P.

[0015] Preferably, both ends of the secondary heating wire are connected to a riveting assembly, the riveting assembly including a rivet and a rivet cap, the rivet passing through the bracket and the secondary heating wire and then riveting to the rivet cap.

[0016] Preferably, the riveting assembly further includes a current-carrying plate, one end of which is sleeved on the rivet and connected to the secondary heating wire, and the other end is connected to the thyristor.

[0017] Preferably, the rivet is also fitted with a spring spacer to keep the secondary heating wire and the current-carrying sheet in elastic contact.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] Designed for use in dual-voltage hair dryers, the bracket has three sets of thyristors with different trigger voltages, arranged from low to high. The thyristor with the lowest trigger voltage is the low-voltage thyristor. The control module detects the input voltage and selects the appropriate thyristor to conduct, causing current to flow into the main heating element. If the control module malfunctions under high voltage input, it selects the low-voltage thyristor to conduct. The secondary heating element connected to the low-voltage thyristor quickly heats up and melts, preventing the main heating element from being melted by the high voltage and blown out by the hair dryer, thus avoiding burns to the user and improving the safety of the hair dryer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the hair dryer using this invention.

[0021] Figure 2 This is a schematic diagram of the structure of this utility model.

[0022] Figure 3 This is an exploded view of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the present invention with a secondary heating wire.

[0024] Figure 5 This is a schematic diagram of the riveting assembly of this utility model.

[0025] Figure 6 This is a circuit diagram of the present invention.

[0026] Figure label:

[0027] Bracket 1, SCR 10, Low-voltage SCR 101, Medium-voltage SCR 102, High-voltage SCR 103, Air inlet 11, Air outlet 12, Control module 13, Main heating wire 2, Secondary heating wire 21, Riveting assembly 3, Electric current conveyor 31, Mica sheet 32, Rivet 33, Rivet cover 331, Spring spacer 34, Hair dryer 4. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] like Figures 1-6 As shown, this utility model provides a high-safety heating frame, including a support 1 and a main heating wire 2. The main heating wire 2 is wound around the support 1. The support 1 is also provided with a silicon controlled rectifier 10 and a secondary heating wire 21. One end of the secondary heating wire 21 is connected to the silicon controlled rectifier 10, and the other end is connected to the main heating wire 2.

[0030] The diameter of the secondary heating wire 21 is smaller than that of the main heating wire 2, so that when the input voltage is too high, the secondary heating wire 21 will melt quickly to prevent the main heating wire 2 from overheating and melting.

[0031] Furthermore, such as Figures 1-5 As shown, the diameter of the main heating wire 2 is 0.1mm-0.6mm. The length of the secondary heating wire 21 is 5mm-20mm. The diameter of the secondary heating wire 21 is 30%-80% of the diameter of the main heating wire 2. The main heating wire 2 and the secondary heating wire 21 are made of the same material.

[0032] Specifically, the diameter of the main heating wire 2 is larger than that of the secondary heating wire 21. This ensures that in abnormal operating conditions, the secondary heating wire 21 can more easily and promptly melt and de-energize the main heating wire 2, thereby protecting the main heating wire 2 and preventing it from melting or deforming, which could lead to malfunctions. It is worth noting that abnormal operating conditions refer to a situation where the control module 13 malfunctions and selects the low-voltage thyristor 101 to conduct when there is a high voltage input. It should be noted that... Figure 5As shown, the bracket 1 has three sets of thyristors 10 with different trigger voltages, and the trigger voltages of the three sets of thyristors 10 increase from low to high. The thyristor 10 with the lowest trigger voltage is the low-voltage thyristor 101, with a trigger voltage of 100-100V. There is also a medium-voltage thyristor 102, with a trigger voltage of 115V, and a high-voltage thyristor 103, with a trigger voltage of 220-240V. The low-voltage thyristor 101 is connected to the main heating wire. The main heating wire 2 and the secondary heating wire 21 are connected. Under normal conditions, when the control module 13 detects a voltage of 100-100V, it controls the low-voltage thyristor 101 to conduct, and the current flows through the main heating wire 2 and then into the secondary heating wire 21. Under abnormal operating conditions, when the control module 13 malfunctions and selects the low-voltage thyristor 101 to conduct, the secondary heating wire 21 will quickly heat up and melt to cut off the power and protect the main heating wire 2.

[0033] In addition, such as Figure 1-6 As shown, the length of the secondary heating wire 21 is between 5-20mm. The secondary heating wire 21 needs to be embedded in the mica sheet 32. When the length of the secondary heating wire 21 is less than 5mm, it cannot be embedded in the mica sheet 32 ​​because it is too short. When the length of the secondary heating wire 21 is greater than 20mm, under abnormal use conditions, when the control module 13 malfunctions and selects the low-voltage thyristor 101 to conduct when high voltage is input, the secondary heating wire 21 heats up quickly and melts. Because the length of the secondary heating wire 21 is relatively long, a lot of molten material is generated when it melts, which may be blown out by the hair dryer 44, easily causing burns. Therefore, when the length of the secondary heating wire 21 is between 5-20mm, the overall safety of the hair dryer 4 is higher.

[0034] Furthermore, such as Figure 1-6 As shown, one end of the bracket 1 is an air inlet 11, and the other end is an air outlet 12. The secondary heating wire 21 is disposed on the side near the air inlet 11. The bracket 1 has a central axis P, and the secondary heating wire 21 is disposed inside the main heating wire 2 and on the side near the central axis P.

[0035] Specifically, by placing the secondary heating wire 21 and the low-voltage thyristor 101 at the air inlet end 11 of the bracket 1, heat dissipation can be achieved for the secondary heating wire 21 and the low-voltage thyristor 101. Furthermore, the aforementioned medium-voltage thyristor 102 and high-voltage thyristor 103 can also be placed on the air inlet end 11 of the bracket 1 to achieve better heat dissipation. Moreover, by placing the secondary heating wire 21 close to the central axis P of the bracket 1, the secondary heating wire 21 is moved away from the main heating wire 2, reducing the heating effect of the main heating wire 2 on the secondary heating wire 21, thereby better ensuring that the secondary heating wire 21 is not burned and melted by the main heating wire 2 under normal conditions.

[0036] Based on the above, such as Figure 2-4 As shown, the secondary heating wire 21 heats up when energized and can also melt in time during abnormal use to protect the main heating wire 2. To ensure that the secondary heating wire 21 can melt more easily and promptly during abnormal use, the diameter of the secondary heating wire 21 is set to 30%-80% of the diameter of the main heating wire 2. Since the diameter of the secondary heating wire 21 is small, in order to prevent the secondary heating wire 21 from overheating and melting during normal use, the secondary heating wire 21 is placed at the end of the bracket 1 near the air inlet 11. Since the motor of the blower 4 drives the fan to blow air into the air inlet 11 of the bracket 1, the air temperature received by the air inlet 11 is low, thus achieving better heat dissipation efficiency for the secondary heating wire 21, thereby protecting the secondary heating wire 21 during normal use and ensuring the normal operation of the blower 4. Since the thyristor 10 also generates heat during operation, placing the thyristor 10 at the air inlet 11 of the bracket 1 can also solve the heat dissipation problem of the thyristor 10.

[0037] Furthermore, such as Figure 1-6 As shown, both ends of the secondary heating wire 21 are connected to a riveting assembly 3. The riveting assembly 3 includes a rivet 33 and a rivet cover 331. The rivet 33 passes through the bracket 1 and the secondary heating wire 21 and is riveted to the rivet cover 33. The riveting assembly 3 also includes a current-carrying piece 31. One end of the current-carrying piece 31 is sleeved on the rivet 33 and is connected to the secondary heating wire 21, while the other end is connected to the silicon controlled rectifier 10. A spring retainer 34 is also sleeved on the rivet 33 to keep the secondary heating wire 21 in elastic contact with the current-carrying piece 31.

[0038] Specifically, such as Figure 3-5As shown, the secondary heating wire 21 is connected to the low-voltage thyristor 101 via the riveting assembly 3. During assembly of the riveting assembly 3, the secondary heating wire 21 is pressed onto the mica sheet 32. Conductivity is achieved by contacting the current-carrying plate 31 with the secondary heating wire 21. Connection holes are provided on the secondary heating wire 21 and the current-carrying plate 31. A connector passes through these connection holes to fix the current-carrying plate 31 and the secondary heating wire 21. During connection, the connector passes sequentially through the mica sheet 32, the current-carrying plate 31, and the secondary heating wire 21 to connect them. The connector can be a screw or a rivet 33. Alternatively, the shank of the screw or rivet 33 can be inserted into the spring retainer 34, and the head of the screw or rivet 33 clamps the spring retainer 34 with the mica sheet 32, causing the spring retainer 34 to undergo elastic deformation. After the end of the screw or rivet 33 passes through the secondary heating wire 21, a rivet cap 331 can be provided at the end to achieve threaded connection with the screw or to abut against the connection hole side of the heating wire after the rivet 33 is riveted. Under normal temperature conditions, the rivet 33 and the mica sheet 32 ​​compress the elastic rivet cap 331, and the elastic rivet cap 331 applies elastic compressive force to the rivet 33 and the mica sheet 32 ​​at the same time. Due to the large temperature change inside the hair dryer 4, the temperature inside the hair dryer 4 rises due to the heating of the heating frame when the hair dryer 4 is used. Due to the effect of thermal expansion and contraction, the spring separator 34 expands, which makes the spring separator 34 apply greater elastic compressive force to the rivet 33 and the mica sheet 32. After the hair dryer 4 is used, the temperature inside the hair dryer 4 gradually drops to normal temperature, so as to adapt to use at high temperature and normal temperature and prevent the rivet 33 from loosening.

[0039] To accommodate the standard voltages of different countries, in this embodiment, such as Figure 6As shown in the circuit diagram, the secondary heating wire 21 and the corresponding thyristor 10 are arranged in three groups. Each group is connected to the main heating wire 2 to form three protection circuits adapted to different voltages. The protection circuit includes a high-voltage circuit of 220-240V, a medium-voltage circuit of 125V, and a low-voltage circuit of 100V-110V. The low-voltage circuit includes the secondary heating wire 21 and the low-voltage thyristor 101. The low-voltage thyristor 101 is connected in series with the control module 13. When the control module 13 detects a power supply voltage of 100-110V, the main heating wire 2, the secondary heating wire 21, the low-voltage thyristor 101, and the control module 13 are connected in series. The medium-voltage circuit includes the medium-voltage secondary heating wire R2 and... The medium-voltage thyristor 102 is connected in series with the control module 13. When the detection module 13 detects a 125V power supply voltage, the main heating wire 2, the medium-voltage secondary heating wire R2, the medium-voltage thyristor 102, and the control module 13 are connected in series. The high-voltage circuit includes a high-voltage secondary heating wire R3 and a high-voltage thyristor 103, which is connected in series with the control module 13. When the control module 13 detects a 220-240V power supply voltage, the high-voltage thyristor 103 is turned on. At this time, the main heating wire 2, the medium-voltage secondary heating wire R2, the high-voltage secondary heating wire R3, the high-voltage thyristor 103, and the control module 13 are connected in series, achieving the effect of adapting to the standard voltage of different countries.

[0040] The following is a detailed explanation of the working principle of this utility model;

[0041] To accommodate use in a dual-voltage hair dryer 4, the bracket 1 has three sets of thyristors 10 with different trigger voltages, arranged from low to high. The thyristor 10 with the lowest trigger voltage is the low-voltage thyristor 101. The control module 13 detects the input voltage and selects the thyristor 10 to conduct, causing current to flow into the main heating wire 2. If the control module 13 malfunctions and selects the low-voltage thyristor 101 to conduct when a high voltage is input, the secondary heating wire 21 connected to the low-voltage thyristor 101 will quickly heat up and melt, preventing the main heating wire 2 from being melted by the high voltage impact and blown out by the fan of the hair dryer 4, thus avoiding burns to the user and improving the safety of using the hair dryer 4.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high safety heat generating rack, characterized by: It includes a bracket (1) and a main heating wire (2), the main heating wire (2) is wound on the bracket (1), the bracket (1) is also provided with a thyristor (10) and a secondary heating wire (21), one end of the secondary heating wire (21) is connected to the thyristor (10), and the other end is connected to the main heating wire (2); The diameter of the secondary heating wire (21) is smaller than that of the main heating wire (2), so that when the input voltage is too high, the secondary heating wire (21) melts quickly to prevent the main heating wire (2) from overheating and melting.

2. The high-safety heating rack according to claim 1, characterized in that: The diameter of the secondary heating wire (21) is 30%-80% of the diameter of the main heating wire (2).

3. The high safety heat generating stand according to claim 2, characterized in that: The diameter of the main heating wire (2) is 0.1mm-0.6mm.

4. The high safety heat generating stand according to claim 1, wherein: The length of the secondary heating wire (21) is 5mm-20mm.

5. The high safety heat generating stand according to claim 1, wherein: The main heating wire (2) and the secondary heating wire (21) are made of the same material.

6. The high safety heat generating stand according to claim 1, wherein: One end of the bracket (1) is the air inlet (11) and the other end is the air outlet (12). The secondary heating wire (21) is located on the side close to the air inlet (11).

7. The high safety heat generating stand according to claim 6, characterized in that: The bracket (1) has a central axis P, and the secondary heating wire (21) is located inside the main heating wire (2) and on the side close to the central axis P.

8. The high safety heat generating stand according to claim 1, wherein: Both ends of the secondary heating wire (21) are connected to a riveting assembly (3). The riveting assembly (3) includes a rivet (33) and a rivet cover (331). The rivet (33) passes through the bracket (1) and the secondary heating wire (21) and is riveted to the rivet cover (331).

9. The high safety heat generating stand according to claim 8, characterized in that: The riveting assembly (3) also includes a current-carrying piece (31), one end of which is sleeved on the rivet (33) and connected to the secondary heating wire (21), while the other end is connected to the thyristor (10).

10. The high-safety heating rack according to claim 9, characterized in that: A spring spacer (34) is also fitted on the rivet (33) to keep the secondary heating wire (21) and the electric plate (31) in elastic contact.

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