Hair dryer
By connecting heating wires with different resistance values in parallel and controlling their conduction state with a controller, the problem of voltage flickering exceeding the safe range in hair dryers under different voltage environments is solved, achieving the effect of safe use under different voltages.
Patent Information
- Application Number
- CN202520290515.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-22
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-22
AI Technical Summary
Existing hair dryers may cause voltage flickering beyond the specified value when used under different voltage conditions, affecting the safety of surrounding electrical appliances or people.
The system employs a first heating wire and a second heating wire connected in parallel. The resistance of the first heating wire is 2-3 times that of the second heating wire. The controller controls the conduction and disconnection states of the heating wires based on the voltage value to ensure safe use under different voltages.
Under different voltage conditions, the power of the hair dryer remains stable, and voltage flickering is within a safe range, avoiding potential harm to electrical appliances and the human body.
Smart Images
Figure CN223860357U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cleaning equipment technology, and in particular to a hair dryer. Background Technology
[0002] As living standards improve, some people carry hair dryers with them. When traveling abroad, travelers may encounter the following problem: Commercial voltages in most countries are mainly divided into two categories: one around 100V and the other around 200V. If using a different voltage in a country, the heating element may not be able to heat up or may not heat up sufficiently. Current technology addresses this problem by using two heating elements with the same resistance value connected in parallel. When the input voltage is around 200V, one heating element is disconnected (not working), leaving only one heating element working. When the input voltage is around 100V, both heating elements work simultaneously. In this case, the hair dryer can generally be used under both voltage conditions.
[0003] However, as people's requirements for the use of electrical appliances become more and more stringent, the above-mentioned circuit will cause voltage flickering that exceeds the specified value. When the voltage flickering exceeds the specified value, the resulting radiation may affect surrounding electrical appliances or cause damage to people's bodies. Utility Model Content
[0004] In view of the shortcomings of the above-mentioned technologies, this utility model provides a hair dryer to improve the safety of hair dryers when used in different voltage areas.
[0005] On the one hand, this utility model provides a hair dryer, including
[0006] The casing defines an airflow channel;
[0007] A fan assembly, disposed within the housing, is used to generate airflow that flows along the airflow channel;
[0008] A heating element is disposed within the airflow channel to heat the airflow; the heating element includes a first heating wire and a second heating wire, which are connected in parallel.
[0009] A switching device for disconnecting / connecting the first heating wire and / or the second heating wire;
[0010] A controller is used to control the switching device. The controller is configured such that when the operating voltage is a first voltage, the controller controls the first heating wire and the second heating wire to be in a conducting state; and when the operating voltage is a second voltage, the controller controls the first heating wire to be in a conducting state and the second heating wire to be in a closed-circuit state.
[0011] Wherein, the value of the second voltage is greater than the value of the first voltage; the resistance value of the first heating wire is 2-3 times the resistance value of the second heating wire.
[0012] Optionally, the heating assembly includes a plurality of mica sheets arranged in a ring, a first heating wire wound around the plurality of mica sheets, a second heating wire wound around the plurality of mica sheets, and the first heating wire and the second heating wire are spaced apart along the airflow direction.
[0013] Optionally, the heating assembly further includes a first circuit, a second circuit, and a third circuit; the first circuit includes a first contact point and a second contact point, the second circuit and the third circuit are connected in parallel to the second contact point of the first circuit, the first heating wire is disposed in the second circuit, and the second heating wire is disposed in the third circuit; wherein, the first circuit is further provided with a normally closed temperature control switch.
[0014] Optionally, the heating assembly further includes a protector, wherein the protector is disposed between the second contact point and the normally closed temperature control switch.
[0015] Optionally, it includes an inner heat insulation cylinder and an outer heat insulation cylinder, with the mica sheet installed between the inner heat insulation cylinder and the outer heat insulation cylinder.
[0016] Optionally, the resistance of the first heating wire is in the range of 32.5-35.5Ω; the resistance of the second heating wire is in the range of 14.5-15.5Ω.
[0017] Optionally, it also includes a temperature controller located between the heating wire and the inner insulation cylinder.
[0018] Optionally, the temperature controller is disposed between two adjacent mica sheets.
[0019] Optionally, the mica sheet along the airflow direction includes an upstream end and a downstream end, and the temperature controller is located between the upstream end and the downstream end.
[0020] Optionally, the protector is disposed at the downstream end of the mica sheet along the airflow direction.
[0021] This utility model provides a hair dryer, which includes a housing and a fan assembly and a heating assembly disposed within the housing. The housing defines an airflow channel. The fan assembly generates airflow along the airflow channel. The heating assembly is disposed within the airflow channel to heat the airflow; the heating assembly includes a first heating wire and a second heating wire, which are connected in parallel. The hair dryer also includes a switching device and a controller for controlling the switching device. The controller is configured such that when the operating voltage is a first voltage, the controller controls the first heating wire and the second heating wire to be in a conductive state; when the operating voltage is a second voltage, the controller controls the first heating wire to be in a conductive state and the second heating wire to be in an open-circuit state. The value of the second voltage is greater than the value of the first voltage; the resistance value of the first heating wire is 2-3 times the resistance value of the second heating wire. By using the above-mentioned resistance values with a specific relationship connected in parallel, different voltage ranges can be applied while meeting safety requirements. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of a hair dryer according to one embodiment of the present invention;
[0023] Figure 2 For along Figure 1 Cross-sectional view in the FF direction;
[0024] Figure 3 for Figure 2 A magnified view of a portion of area A shown in the image.
[0025] Figure 4 This is a schematic diagram of the heating component in one embodiment;
[0026] Figure 5 This is a schematic diagram of the heating component in another embodiment;
[0027] Figure 6 for Figure 5 A magnified view of the area shown in B;
[0028] Figure 7 for Figure 5 Side view of the heating assembly shown;
[0029] Figure 8 for Figure 7 A magnified view of the area shown in C.
[0030] Figure 9 for Figure 5 The main view of the heating component shown;
[0031] Figure 10 This is a circuit diagram of the heating component in one embodiment. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0036] refer to Figure 1-10 , Figure 1 and 2A hair dryer 100 is disclosed. The hair dryer 100 includes a housing 1, which defines an airflow channel 3. The hair dryer 100 also includes a fan assembly 2 and a heating assembly 4 disposed within the housing 1. The fan assembly 2 is used to generate airflow along the airflow channel 3; the fan assembly 2 generally includes a motor, a fan, and a corresponding controller. Since the fan assembly 2 is conventional technology, it will not be described in detail here. The heating assembly 4 is disposed within the airflow channel 3 to heat the airflow. When the heating assembly 4 is working, it can heat the airflow passing through it. The heated airflow is blown out from the air outlet of the hair dryer 100.
[0037] refer to Figure 2-10 The heating assembly 4 includes a first heating wire 41 and a second heating wire 42, which are arranged in parallel (see reference). Figure 10 The hair dryer 100 also includes a switching device (not shown) and a controller (not shown) for controlling the switching device. The switching device is used to open / close the first heating wire 41 and / or the second heating wire 42. The controller is used to control the switching device. The controller is generally a PCB board or composed of other common components, which will not be described in detail here. The controller is configured to control the first heating wire 41 and the second heating wire 42 to be in a conducting state when the operating voltage is a first voltage; and to control the first heating wire 41 to be in a conducting state and the second heating wire 42 to be in an open-circuit state when the operating voltage is a second voltage; wherein, the resistance value of the first heating wire 41 is 2-3 times the resistance value of the second heating wire 42. The resistance value range of the first heating wire 41 is 32.5-35.5Ω. The resistance value range of the second heating wire 42 is 14.5-15.5Ω.
[0038] The first voltage is typically around 110V. The second voltage is typically around 220V. Assuming the resistance of the first heating wire 41 is 34Ω, the resistance of the second heating wire 42 is 15Ω, the first voltage is 110V, and the second voltage is 220V, according to the power calculation formula P=U... 2 According to the formula above, the power of heating element 4 is 1157W when the first voltage is used. When the second voltage is used, the power of heating element 4 is 1176W. Since the power difference between the two is not significant, the hair dryer 100 can work normally under different voltages, and the voltage flickering generated is within the range required by safety regulations.
[0039] If the two resistor values are the same, then to keep the power of the hair dryer at around 1200W, the resistor value needs to be set to 18 ohms. When using the first voltage, the power is around 1112W. When using the second voltage, the power will reach around 2105W. In order to control the power at around 1200W, the voltage needs to be controlled. At this time, the resulting voltage flicker will exceed the range required by safety regulations, affecting the safety of surrounding electrical appliances or people.
[0040] If two heating wires with the same resistance are connected in series at high voltage and one of the resistors is short-circuited at low voltage, the requirements can be met, but the cost of the additional relay required to short-circuit one of the resistors is relatively high.
[0041] refer to Figure 10 Other views can also be referenced, showing the circuit principle of heating component 4. Heating component 4 also includes a first circuit 46, a second circuit 47, and a third circuit 48. The first circuit 46 includes a first contact point 49 and a second contact point 50, with the first contact point 49 electrically connected to the positive / negative terminals of the power supply. The second circuit 47 and the third circuit 48 are connected in parallel to the second contact point 50 of the first circuit 46. The other ends of the second circuit 47 and the third circuit 48 are respectively electrically connected to the other terminals of the power supply. A first heating wire 41 is disposed in the second circuit 47. A second heating wire 42 is disposed in the third circuit 48. The first circuit 46 also includes a normally closed temperature control switch 51. The normally closed temperature control switch 51 is for circuit protection. When the temperature of heating component 4 is too high, the normally closed temperature control switch 51 opens, and heating component 4 stops working. When the temperature of heating component 4 drops, the normally closed temperature control switch 51 closes, and heating component 4 can be used normally. The temperature controller 55, temperature control switch, etc., are conventional components familiar to those skilled in the art and will not be described in detail here.
[0042] To further ensure the normal operation of the hair dryer 100, the heating assembly 4 also includes a protector 52, which is located between the second contact point 50 and the normally closed temperature control switch 51. The protector 52 is a thermal fuse. When the temperature exceeds a certain value, the thermal fuse melts to protect the hair dryer 100, and the heating assembly 4 can no longer be used.
[0043] refer to Figure 2-4In one embodiment, the heating assembly 4 includes an inner heat insulation cylinder 53, an outer heat insulation cylinder 54, and multiple mica sheets 43. The multiple mica sheets 43 are arranged in a ring between the inner heat insulation cylinder 53 and the outer heat insulation cylinder 54. A first heating wire 41 is wound around the multiple mica sheets 43, and a second heating wire 42 is wound around the multiple mica sheets 43. The first heating wire 41 and the second heating wire 42 are spaced apart along the airflow direction. By winding the two heating wires alternately around the serrated structure of the mica sheets 43, the heating assembly 4 can be heated more evenly.
[0044] refer to Figure 2-4 The heating assembly 4 also includes a thermostat 55, which is located between the heating wire and the inner insulation cylinder 53. The thermostat 55 is disposed between two adjacent mica sheets 43. Each mica sheet 43 along the airflow direction includes an upstream end 44 and a downstream end 45, and the thermostat 55 is located between the upstream end 44 and the downstream end 45. A protector 52 along the airflow direction is disposed at the downstream end 45 of the mica sheet 43.
[0045] In another embodiment, reference Figure 5-9 The heating component 4 includes multiple mica sheets 43 arranged in a cross pattern. The multiple mica sheets 43 form a ring structure. The first heating wire 41 and the second heating wire 42 are wound alternately around the serrated structure of the mica sheet 43. By winding the two heating wires alternately around the serrated structure of the mica sheet 43, the heating component 4 can be heated more evenly.
[0046] refer to Figure 5-9 The heating assembly 4 also includes a thermostat 55, which is located between the heating wire and the inner insulation cylinder 53. The thermostat 55 is disposed between two adjacent mica sheets 43. Each mica sheet 43 along the airflow direction includes an upstream end 44 and a downstream end 45, and the thermostat 55 is located between the upstream end 44 and the downstream end 45. A protector 52 along the airflow direction is disposed at the downstream end 45 of the mica sheet 43.
[0047] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A hair dryer, characterized in that, include: The casing defines an airflow channel; A fan assembly, disposed within the housing, is used to generate airflow that flows along the airflow channel; A heating element is disposed within the airflow channel to heat the airflow; the heating element includes a first heating wire and a second heating wire, which are connected in parallel. A switching device for disconnecting / connecting the first heating wire and / or the second heating wire; A controller is used to control the switching device. The controller is configured such that when the operating voltage is a first voltage, the controller controls the first heating wire and the second heating wire to be in a conducting state; and when the operating voltage is a second voltage, the controller controls the first heating wire to be in a conducting state and the second heating wire to be in a closed-circuit state. Wherein, the value of the second voltage is greater than the value of the first voltage; the resistance value of the first heating wire is 2-3 times the resistance value of the second heating wire.
2. The hair dryer as described in claim 1, characterized in that, The heating assembly includes a plurality of mica sheets arranged in a ring, a first heating wire wound around the plurality of mica sheets, a second heating wire wound around the plurality of mica sheets, and the first heating wire and the second heating wire are spaced apart along the airflow direction.
3. The hair dryer as described in claim 2, characterized in that, The heating assembly further includes a first circuit, a second circuit, and a third circuit; the first circuit includes a first contact point and a second contact point, the second circuit and the third circuit are connected in parallel to the second contact point of the first circuit, the first heating wire is disposed in the second circuit; the second heating wire is disposed in the third circuit; wherein, the first circuit is further provided with a normally closed temperature control switch.
4. The hair dryer as described in claim 3, characterized in that, The heating assembly also includes a protector, wherein the protector is disposed between the second contact point and the normally closed temperature control switch.
5. The hair dryer as described in claim 2, characterized in that, It includes an inner heat insulation cylinder and an outer heat insulation cylinder, with the mica sheet installed between the inner heat insulation cylinder and the outer heat insulation cylinder.
6. The hair dryer as described in claim 1 or 2, characterized in that, The resistance of the first heating wire is in the range of 32.5-35.5Ω; the resistance of the second heating wire is in the range of 14.5-15.5Ω.
7. The hair dryer as described in claim 5, characterized in that, It also includes a thermostat located between the heating wire and the inner insulation cylinder.
8. The hair dryer as described in claim 7, characterized in that, The temperature controller is positioned between two adjacent mica sheets.
9. The hair dryer as described in claim 8, characterized in that, The mica sheet along the airflow direction includes an upstream end and a downstream end, and the temperature controller is located between the upstream end and the downstream end.
10. The hair dryer as described in claim 4, characterized in that, The protector is located at the downstream end of the mica sheet along the airflow direction.