Hair dryer electric heating system compatible with global mains supply voltage

Abstract

The invention provides a blower electric heating system compatible with global mains supply voltage. The blower electric heating system comprises a detachable shell, a power line and a power line protection sleeve. The electric heating module comprises a heating mounting cylinder assembly, a mica frame and a plurality of electric heating groups; the number of the electric heating groups is greater than or equal to 3 and the power sum is unchanged; the control motor module comprises a detachable motor mounting shell and a brushless high-speed motor with the voltage of 100-250 VAC; the brushless high-speed motor is provided with a grounding connection terminal and comprises a motor shell, a loop assembly, a pair of magnetic poles, a six-slot six-tooth stator core and a conductor wound on the six-slot six-tooth stator core in a slot winding mode; and an air inlet module. Three or more electric heating groups and control motor modules are used, the electromagnetic compatibility standard (EMC) of the international electrician committee is met, uniform heating is achieved, the use comfort is improved, electrostatic discharge interference and electromagnetic interference can be reduced, and normal work of equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electric hair dryers, and in particular to an electric heating system for a hair dryer which is compatible with global mains voltages. Background Art

[0002] Hair dryers are essential home appliances for hair care, air-drying clothes, etc. in daily life and travel. Traditional motor hair dryers must be designed and developed with a specific voltage range in mind, and can only be used safely within the specified voltage range. Currently, the global mains voltage is divided into two voltage ranges, namely 100-130VAC and 220-240VAC. Due to the existence of these two voltages, many home appliances and home appliances are not compatible with these two voltages. Therefore, all home appliances and home appliances must indicate which voltage range the home appliances or devices use. If the home appliances or home appliances used by consumers do not match the local mains voltage, then the appliances or devices will either not work properly or be burned out. As an essential home appliance for today's families, the current hair dryer is a home appliance that is not compatible with these two voltages. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a hair dryer electric heating system that is compatible with global mains voltage, using three or more electric heating groups and control motor modules, complying with the electromagnetic compatibility standards (EMC) of the International Electrotechnical Commission, achieving uniform heating, improving user comfort, and reducing electrostatic discharge interference and electromagnetic interference to ensure normal operation of the equipment.

[0004] To achieve the above-mentioned object, the present invention provides the following solution: a hair dryer electric heating system compatible with global mains voltage, comprising a detachable housing and an electric heating module arranged inside the detachable housing, a control motor module connected to the electric heating module, and an air inlet module connected to the control motor module;

[0005] The detachable housing comprises a first housing and a second housing, and a power cord and a power cord protective cover arranged at the connection between the detachable housing and the power cord are arranged at the bottom end of the detachable housing;

[0006] The electric heating module comprises a heating installation tube assembly, a mica frame arranged inside the heating installation tube assembly, and a plurality of electric heating groups evenly arranged on the mica frame; wherein the number of the electric heating groups is greater than or equal to 3, and the total power of the electric heating groups remains unchanged;

[0007] The control motor module includes a detachable motor mounting shell connected to the heating mounting tube assembly and a brushless high-speed motor with a voltage of 100 to 250VAC arranged inside the detachable motor mounting shell; wherein, a grounding connection terminal is arranged on the brushless high-speed motor, and the brushless high-speed motor includes a motor housing, a loop assembly arranged at one end of the motor housing, a pair of magnetic poles arranged inside the motor housing, a six-slot six-tooth stator core, and a conductor wound on the six-slot six-tooth stator core by a slot winding method.

[0008] Optionally, an air outlet filter is provided at one end of the heating mounting tube assembly, and an insulating mica sleeve for protecting the heating mounting tube is provided on the inner surface of the heating mounting tube assembly. The detachable motor mounting shell is provided at the other end of the heating mounting tube assembly, and the detachable motor mounting shell includes a first motor mounting shell and a second motor mounting shell connected to the first motor mounting shell.

[0009] Optionally, a layer of rubber coating for insulation is provided on the surface of the six-slot six-tooth stator core, and the six-slot six-tooth stator core includes a first core, a second core, a third core, a fourth core, a fifth core and a sixth core, the first core and the third core are a first core group, the second core and the fourth core are a second core group, and the third core and the sixth core are a third core group; wherein, for the two cores in each group, the first core for winding adopts clockwise winding or counterclockwise winding, and the second core adopts a winding method opposite to that of the first core for winding.

[0010] Optionally, the circuit assembly includes six bosses arranged at one end of the motor housing, a conductive terminal arranged at one end of the boss and connected to the six-slot six-tooth stator core, and a PCB board and a power connector arranged at one end of the conductive terminal.

[0011] Optionally, the tooth loop width of the six-slot six-tooth stator core is 1.3-1.5 mm, and the calculation formula of the tooth loop width is:

[0012] bt=3.14*D*Br / Zbz

[0013] Among them, D is the stator outer diameter, Br is the air gap flux, Z is the number of teeth, and bz is the magnetic flux density of the silicon steel sheet.

[0014] Optionally, the air inlet module includes an air inlet and a first air inlet filter and a second air inlet filter arranged at two ends of the air inlet.

[0015] The present invention discloses the following technical effects by providing a hair dryer electric heating system compatible with global mains voltage:

[0016] 1. The present invention adopts a design of three or more electric heating groups (including resistance heating groups and other heating methods, such as ceramic heating groups, etc.), which can: 1) allow a smaller current to pass through each heating group while keeping the total power unchanged, thereby reducing the harmonic current of a single heating group, reducing the impact of voltage fluctuations on the power grid, and thereby reducing the impact of the hair dryer on the use of other electronic products or electrical appliances. 2) In the same space, a single electric heating group with the same power will be concentrated in one area, with more concentrated heat; while multiple electric heating groups can be arranged more evenly, and the temperature of the electric heating groups is more uniform, solving the problem of local redness of the heating groups in the hair dryer due to concentrated heat. 3) The temperature of the wind blown out by the hair dryer is more uniform, which improves the comfort of use. 4) An insulating mica sleeve is designed on the periphery of the heating wire, which can protect the assembly shell of the heating wire and prevent the assembly shell from deformation due to excessively high temperature.

[0017] 2. The present invention adopts a brushless high-speed motor with a voltage of 100-250VAC, which can: 1) conduct away the static electricity generated by the motor operation through the ground terminal connected to the ground point of the control circuit, ensuring that the electrostatic discharge immunity (ESD) meets the EMC test standard. 2) through electromagnetic calculation, the magnetic circuit width of the motor stator core is designed to be sufficient to ensure that the comprehensive magnetic field generated by the energized coil and the permanent magnet can pass through, reducing the electromagnetic interference (EMI) generated by the excess magnetic field leakage. 3) The air intake adopts a double-layer filter to protect human hair from being easily caught in the hair dryer, and at the same time has a noise reduction effect.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 An exploded schematic diagram of a system device structure provided by an embodiment of the present invention;

[0021] Figure 2 A circuit diagram of a system provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of an electric heating module provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a control motor module provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of a brushless high-speed motor provided in an embodiment of the present invention;

[0025] Figure 6 A top view of a brushless high-speed motor provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of winding of a six-slot six-tooth stator core provided in an embodiment of the present invention;

[0027] Explanation of the reference numerals: 11. first outer shell; 12. second outer shell; 13. power cord; 14. power cord protective cover; 2. heating installation tube assembly; 21. air outlet filter; 22. heat-insulating mica sleeve; 231. mica frame; 232. electric heating group; 31. first motor mounting shell; 32. second motor mounting shell; 33. brushless high-speed motor; 331. motor shell; 332. six-slot six-tooth stator core; 333. boss; 334. conductive terminal; 34. grounding terminal; 35. PCB board; 36. power connector; 4. air inlet; 41. first air inlet filter; 42. second air inlet filter. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-2 As shown, the present invention provides a hair dryer electric heating system that is compatible with global mains voltage, characterized in that it includes a detachable shell and an electric heating module arranged inside the detachable shell, a control motor module connected to the electric heating module, and an air intake module connected to the control motor module.

[0031] like Figure 1 As shown, the detachable housing includes a first housing 11 and a second housing 12 , and a power cord 13 and a power cord protective cover 14 are arranged at the bottom end of the detachable housing at the connection between the detachable housing and the power cord 13 .

[0032] like Figure 1 , Figure 3As shown, the electric heating module includes a heating installation tube assembly 2, a mica frame 231 arranged inside the heating installation tube assembly 2, and multiple groups of electric heating groups 232 evenly arranged on the mica frame 231; wherein the number of the electric heating groups 232 is greater than or equal to 3, and the total power of the electric heating groups 232 remains unchanged. By adopting a design of three or more groups of electric generators (including resistance heating groups and other heating methods, such as ceramic heating groups, etc.), a smaller current passes through each heating group under the condition of unchanged total power, thereby reducing the harmonic current of a single heating group, reducing the impact of voltage fluctuations on the power grid, and thus reducing the impact of the hair dryer on the use of other electronic products or electrical appliances.

[0033] Harmonics are mainly sinusoidal signals applied to non-linear loads, which distort the fundamental current or voltage to form a non-sinusoidal wave. In power systems or energized circuits, the most beneficial thing for production and life is that the AC voltage or AC current presents a sinusoidal waveform. For linear resistors or components, after a sinusoidal voltage is applied, it is still a sine wave of the same frequency, which will not affect the applied voltage or current. For non-linear loads, the current will become non-sinusoidal during the power-on process, and a voltage drop will be generated on it, resulting in a non-sinusoidal voltage. This non-sinusoidal voltage generally meets the Dirichlet condition, which can be decomposed into a Fourier series. Through Fourier calculation, it can be analyzed that those harmonics have a greater impact on the circuit, and the corresponding circuits can be improved one by one to eliminate interference.

[0034] Through the above analysis, the heating wire wound in the hair dryer is a nonlinear load. In order to eliminate the interference of harmonics, multiple groups of heating wires are connected in parallel instead of a single group of heating wires while keeping the total power unchanged. The total current in the multiple heating wires is equal to the current of a single heating wire, and the current in each path is smaller, so that the waveform distortion is smaller, thereby having less impact on EMC.

[0035] In summary, the present invention arranges the heating groups more evenly. In the same space, a single group of electric heating groups 232 with the same power will be concentrated in one part, and the heat will be concentrated; while multiple groups can be arranged more evenly, and the temperature of the electric heating groups 232 is more uniform, which solves the problem of local redness of the heating groups in the hair dryer due to concentrated heat. And the temperature of the wind blown out by the hair dryer is more uniform, which improves the comfort of use.

[0036] like Figure 1 As shown, an air outlet filter 21 is provided at one end of the heating mounting tube assembly 2, and an insulating mica sleeve 22 for protecting the heating mounting tube is provided on the inner surface of the heating mounting tube assembly 2. The detachable motor mounting shell is provided at the other end of the heating mounting tube assembly 2, and the detachable motor mounting shell includes a first motor mounting shell 31 and a second motor mounting shell 32 connected to the first motor mounting shell 31.

[0037] like Figure 4 , Figure 5 , Figure 6 As shown, the control motor module includes a detachable motor mounting shell connected to the heating mounting cylinder assembly 2 and a brushless high-speed motor 33 with a voltage of 100-250VAC set inside the detachable motor mounting shell.

[0038] Among them, Figure 4 As shown, the brushless high-speed motor 33 is provided with a grounding connection terminal 34, which can conduct away the static electricity generated by the operation of the motor through grounding to ensure that the electrostatic discharge immunity (ESD) meets the EMC test standard. The brushless high-speed motor 33 includes a motor housing 331, a circuit component arranged at one end of the motor housing 331, a pair of magnetic poles (i.e., NS) arranged inside the motor housing 331, a six-slot six-tooth stator core 332, and a conductor wound on the six-slot six-tooth stator core 332 by a slot winding method.

[0039] like Figure 7 As shown, the surface of the six-slot six-tooth stator core 332 is provided with a layer of rubber coating for insulation. The six-slot six-tooth stator core 332 includes a first core, a second core, a third core, a fourth core, a fifth core and a sixth core. The first core and the third core are a first core group, the second core and the fourth core are a second core group, and the third core and the sixth core are a third core group. Among them, for the two cores in each group, the first core for winding adopts clockwise winding or counterclockwise winding, and the second core adopts a winding method opposite to that of the first core for winding. For example: the conductor winding method on the first core, the second core and the third core is clockwise winding, and the conductor winding method on the fourth core, the fifth core and the sixth core is counterclockwise winding. As Figure 7 As shown, X, Y, Z, U, V, and W are sequentially connected to the six conductive terminals 334 on the stator rubber coating.

[0040] A pair of magnetic poles of the motor cooperates with this special conductor winding method. When the wound stator is combined with the corresponding rotor, it complies with the electromagnetic principle that like poles attract and opposite poles repel, so that the rotor rotates to generate torque to drive the load to do work.

[0041] like Figure 6 , Figure 7 As shown, the tooth loop width of the six-slot six-tooth stator core 332 is 1.3-1.5 mm. Through electromagnetic calculation, the magnetic path width of the motor stator core is designed to be sufficient to ensure that the combined magnetic field generated by the energized coil and the permanent magnet can pass through, prevent the generation of excess magnetic leakage, and meet the EMC test for electromagnetic interference (EMI). The calculation formula for the tooth loop width is:

[0042] bt=3.14*D*Br / Zbz

[0043] Among them, D is the stator outer diameter, Br is the air gap flux, Z is the number of teeth, and bz is the magnetic flux density of the silicon steel sheet.

[0044] like Figure 5 As shown, the circuit assembly includes six bosses 333 disposed at one end of the motor housing 331, a conductive terminal 334 disposed at one end of the boss 333 and connected to the six-slot six-tooth stator core 332, and a PCB board 35 and a power connector 36 disposed at one end of the conductive terminal 334. Each conductive terminal 334 is respectively connected to the head end and the tail end of the winding to form a circuit with the PCB board 35 assembled on the stator, so that the motor rotates to generate torque when powered on.

[0045] like Figure 1 As shown, the air inlet module includes an air inlet 4 and a first air inlet filter 41 and a second air inlet filter 42 arranged at both ends of the air inlet 4. The double-layer filter is used to protect human hair from being easily caught in the hair dryer and to reduce noise.

[0046] Therefore, the present invention provides a hair dryer electric heating system that is compatible with global mains voltage, uses three or more electric heating groups and control motor modules, complies with the electromagnetic compatibility (EMC) standards of the International Electrotechnical Commission, achieves uniform heating, improves user comfort, and can reduce electrostatic discharge interference and electromagnetic interference to ensure normal operation of the equipment.

[0047] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0048] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hair dryer electric heating system compatible with global mains voltage, characterized in that: It comprises a detachable housing, an electric heating module arranged inside the detachable housing, a control motor module connected to the electric heating module, and an air intake module connected to the control motor module; The detachable housing comprises a first housing and a second housing, and a power cord and a power cord protective cover arranged at the connection between the detachable housing and the power cord are arranged at the bottom end of the detachable housing; The electric heating module comprises a heating installation tube assembly, a mica frame arranged inside the heating installation tube assembly, and a plurality of electric heating groups evenly arranged on the mica frame; wherein the number of the electric heating groups is greater than or equal to 3, and the total power of the electric heating groups remains unchanged; The control motor module includes a detachable motor mounting shell connected to the heating mounting tube assembly and a brushless high-speed motor with a voltage of 100 to 250VAC arranged inside the detachable motor mounting shell; wherein, a grounding connection terminal is arranged on the brushless high-speed motor, and the brushless high-speed motor includes a motor housing, a loop assembly arranged at one end of the motor housing, a pair of magnetic poles arranged inside the motor housing, a six-slot six-tooth stator core, and a conductor wound on the six-slot six-tooth stator core by a slot winding method.

2. The hair dryer electric heating system compatible with global mains voltage according to claim 1, characterized in that: An air outlet filter is provided at one end of the heating installation tube assembly, and an insulating mica sleeve for protecting the heating installation tube is provided on the inner surface of the heating installation tube assembly. The detachable motor mounting shell is provided at the other end of the heating installation tube assembly, and the detachable motor mounting shell includes a first motor mounting shell and a second motor mounting shell connected to the first motor mounting shell.

3. The hair dryer electric heating system compatible with global mains voltage according to claim 2, characterized in that: A layer of rubber coating for insulation is provided on the surface of the six-slot six-tooth stator core. The six-slot six-tooth stator core includes a first core, a second core, a third core, a fourth core, a fifth core and a sixth core. The first core and the third core form a first core group, the second core and the fourth core form a second core group, and the third core and the sixth core form a third core group. Among them, for the two cores in each group, the first core for winding is wound clockwise or counterclockwise, and the second core is wound in a manner opposite to that of the first core for winding.

4. The hair dryer electric heating system compatible with global mains voltage according to claim 3, characterized in that: The circuit assembly includes six bosses arranged at one end of the motor housing, a conductive terminal arranged at one end of the boss and connected to the six-slot six-tooth stator core, and a PCB board and an electrical connector arranged at one end of the conductive terminal.

5. The hair dryer electric heating system compatible with global mains voltage according to claim 4, characterized in that: The tooth loop width of the six-slot six-tooth stator core is 1.3-1.5 mm, and the calculation formula of the tooth loop width is: bt=3.14*D*Br / Zbz Among them, D is the stator outer diameter, Br is the air gap flux, Z is the number of teeth, and bz is the magnetic flux density of the silicon steel sheet.

6. The hair dryer electric heating system compatible with global mains voltage according to claim 5, characterized in that: The air inlet module includes an air inlet and a first air inlet filter and a second air inlet filter arranged at two ends of the air inlet.

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