A dual-drive hair dryer

Abstract

The present invention relates to the field of household appliances. In order to solve the balance problem between the air volume and noise of a hair dryer, particularly relates to a dual-drive hair dryer, which includes a housing, a handle assembly connected to the housing, a first fan unit, a heating unit, a first air inlet and a first air outlet; the first air outlet is provided at the front end of the housing; the first fan unit is used for sucking air flow to enter the hair dryer from the first air inlet and blowing it out from the first air outlet to form a main air duct, and the heating unit is used for heating the air flow; the first fan unit includes a fan blade and a motor for driving the fan blade to rotate; the first fan unit is arranged in the handle assembly, and the first air inlet is arranged on the handle assembly; the hair dryer further includes a second fan unit arranged in the housing, a second air inlet arranged at the rear end of the housing, and a second air outlet arranged at the front end of the housing. The second fan unit sucks air flow to enter the housing from the second air inlet and blows it out from the second air outlet to form an auxiliary air duct. The air volume is increased.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and in particular to a double - drive hair dryer. Background Art

[0002] The existing hair dryer products are limited by the installation space and weight, and there is only one fan unit. The fan unit includes a motor and a fan blade driven by the motor to rotate. The size of the air volume is greatly affected by the fan unit. Currently, the common method is to use a motor with good performance to obtain a larger rotational speed, thereby obtaining a larger air volume. The resulting disadvantage is greater noise. The noise generated by the motor itself, the noise generated by the motor driving the fan blade to rotate, the noise generated when the air flow enters the hair dryer through the air inlet of the hair dryer, and the noise generated when the air flow flows through the internal structural parts of the hair dryer will all increase. Moreover, the vibration of the motor will also increase. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a double - drive hair dryer.

[0004] The technical solution of the present invention is as follows:

[0005] A double - drive hair dryer includes a housing, a handle assembly connected to the housing, a first fan unit, a heating unit, a first air inlet, and a first air outlet; the first air outlet is provided at the front end of the housing;

[0006] The first fan unit is used to suck air flow into the hair dryer from the first air inlet and blow it out from the first air outlet to form a main air duct, and the heating unit is used to heat the air flow;

[0007] The first fan unit includes a fan blade and a motor for driving the fan blade to rotate;

[0008] Wherein, the first fan unit is arranged in the handle assembly, and the first air inlet is arranged on the handle assembly;

[0009] The hair dryer further includes a second fan unit arranged in the housing, a second air inlet arranged at the rear end of the housing, and a second air outlet arranged at the front end of the housing. The second fan unit sucks air flow into the housing from the second air inlet and blows it out from the second air outlet to form an auxiliary air duct.

[0010] Preferably, the main air duct includes a first section extending along the axis direction of the housing and a second section extending along the axis direction of the handle assembly. The connection part between the handle assembly and the housing forms an air flow inlet for the air flow to enter from the first section into the second section, and the second fan unit is arranged upstream of the air flow inlet.

[0011] Preferably, the main air duct includes a first section extending along the axis direction of the housing, and the second fan unit is arranged between the rear end of the first section and the second air inlet.

[0012] Preferably, an inner cylinder for defining the first section is further provided inside the outer shell, and the rear end of the inner cylinder is sealed by a seal.

[0013] Preferably, the seal includes a sealing plate, and an installation cavity for installing the second fan unit is provided on one side of the sealing plate facing the second air inlet.

[0014] Preferably, the distance between the installation cavity and the second air inlet is L, and 5mm ≤ L ≤ 25mm.

[0015] Preferably, the heating unit is arranged inside the inner cylinder, and the auxiliary air duct includes a third section defined by the inner cylinder and the outer shell, and the third section extends around the first section.

[0016] Preferably, the second fan unit and the first section are coaxially arranged.

[0017] Preferably, the heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit, and the first fan unit and the second fan unit start simultaneously; or, the first fan unit starts earlier than the second fan unit.

[0018] Preferably, the heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit, and the first fan unit and the second fan unit stop simultaneously; or, the second fan unit stops earlier than the first fan unit.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. By making the hair dryer have two fan units, the advantage is that a large air volume can be obtained without increasing the rotational speed of the motor. Therefore, the noise of the hair dryer will not increase significantly due to the increase in air volume. By selecting a suitable fan unit, the effect of significantly increasing the air volume with almost no increase in noise can be achieved. Therefore, the vibration of the motor will not increase significantly either; by arranging the first fan unit inside the handle assembly and the second fan unit at the rear end of the outer shell, the weight of the outer shell and the handle assembly can be balanced, improving the user experience; by forming an auxiliary air duct (cold air duct) with the second fan unit, the problem of poor drying efficiency caused by the reduction of the hot air volume due to the cold air flow in the auxiliary air duct and the hot air flow in the main air duct being affected by the same fan unit in the prior art is overcome. In the present invention, the hot air flow in the main air duct and the cold air flow in the auxiliary air duct are formed by the action of independent fan units, and the air volume in the main air duct will not be lost due to the setting of the auxiliary air duct, and the drying efficiency is high.

[0021] 2. By arranging the second fan unit upstream of the main air duct air inlet, the advantage is to reduce the influence of the second fan unit on the air volume of the main air duct. This setting method can obtain the maximum air volume in the main air duct, reduce the air volume loss generated when the air flow changes direction from the second section to the first section, and improve the drying efficiency. Moreover, it is beneficial to simplify the internal structure of the hair dryer.

[0022] 3. By arranging the second fan unit between the rear end of the first section and the second air inlet, a relatively large air volume can be obtained in the auxiliary air duct, which is convenient for sucking more air flow from the second air inlet and reducing the air volume loss in the auxiliary air duct.

[0023] 4. By sealing the rear end of the inner cylinder, the advantage is to reduce the wind pressure loss in the main air duct, so that the air flow blown out from the first air outlet has a relatively large wind force, which can disperse the wet hair in strands, increase the contact area between the hair and the hot air flow, and improve the drying efficiency.

[0024] 5. By installing the second fan unit in the installation cavity of the sealing plate, the advantage is to reduce the volume of the hair dryer, reduce the increase in the length of the outer shell caused by the setting of the second fan unit, and improve the comfort of blowing the hair at the back of the head.

[0025] 6. By setting the distance between the installation cavity and the second air inlet as L, where 5mm ≤ L ≤ 25mm, the advantage is to ensure the installation of the fan unit while reducing the increase in the length of the outer shell caused by the setting of the second fan unit. When L < 5mm, due to the limitation of the fan unit, there may be interference between the fan unit and the rear end of the outer shell. When L > 25mm, the length of the outer shell becomes too long, the volume increases, and it appears bulky, especially causing inconvenience to users when blowing the hair at the back of the head.

[0026] 7. Through the setting of the third section of the auxiliary air duct and making the third section extend around the first section to form a flowing heat insulation space, the temperature rise of the outer shell is reduced. Moreover, there is an obvious temperature gradient in the air flow blown out from the first air outlet and the second air outlet, reducing the probability of generating hot spots and improving the comfort during the hair drying process.

[0027] 8. By coaxially arranging the second fan unit with the first section, the advantage is to reduce the air volume loss in the auxiliary air duct.

[0028] 9. By making the heating unit not start earlier than the first fan unit and not stop working later than the first fan unit, it is possible to prevent safety accidents such as the heating unit turning red, the plastic parts of the hair dryer deforming or even burning out due to the untimely dissipation of the heat of the heating unit. The first fan unit and the second fan unit start simultaneously, and the cold air flow in the auxiliary air duct enters the interior of the outer shell to reduce the temperature rise of the outer shell.

[0029] The heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit, preventing safety accidents such as the heating unit turning red, the plastic parts of the hair dryer deforming or even burning out due to the untimely dissipation of heat from the heating unit. The first fan unit starts earlier than the second fan unit, saving the usage cost.

[0030] 10. By making the heating unit not start earlier than the first fan unit and not stop working later than the first fan unit, it prevents safety accidents such as the heating unit turning red, the plastic parts of the hair dryer deforming or even burning out due to the untimely dissipation of heat from the heating unit. The first fan unit and the second fan unit stop simultaneously. The advantage is that during the entire process of continuously blowing hair through the auxiliary air duct, the air volume is increased, the hair is quickly dried, and the temperature rise of the housing is reduced.

[0031] By making the heating unit not start earlier than the first fan unit and not stop working later than the first fan unit, it prevents safety accidents such as the heating unit turning red, the plastic parts of the hair dryer deforming or even burning out due to the untimely dissipation of heat from the heating unit. The second fan unit stops earlier than the first fan unit. The advantage is that when the hair is almost dried, the second fan unit can stop working, reducing the air volume and saving energy. Brief Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the overall structure of the hair dryer in an example of the present invention.

[0033] Figure 2 It is a cross-sectional view of the hair dryer in an example of the present invention.

[0034] Figure 3 It is a partial exploded view of the hair dryer in an example of the present invention.

[0035] Figure 4 It is a schematic diagram of the structure of the sealing plate in an example of the present invention.

[0036] Figure 5 It is a schematic diagram of the structure of the sealing plate and the circuit board in an example of the present invention.

[0037] Figure 6 It is another partial exploded view of the hair dryer in an example of the present invention.

[0038] Figure 7 It is a schematic diagram of the structure of the hair dryer in another example of the present invention.

[0039] Figure 8 It is a partial cross-sectional view of the hair dryer in another example of the present invention.

[0040] Figure 9 It is a cross-sectional view of the hair dryer in another example of the present invention.

[0041] Figure 10 Schematic diagram of the structure of the heating unit in another example of the present invention.

[0042] The names of the components marked in the figure are as follows:

[0043] 1. Outer shell; 2. Handle assembly; 3. First fan unit; 4. Heating unit; 5. First air inlet; 6. First air outlet; 7. Second fan unit; 8. Second air inlet; 9. Second air outlet; 10. Main air duct; 11. Auxiliary air duct; 12. Inner cylinder; 13. Sealing plate; 14. Installation cavity; 15. Air flow guiding groove; 16. Partition plate; 17. Opening groove; 18. Non-closed pipe; 19. Inner wall; 20. Outer wall; 21. Open part; 22. Heat insulation member; 23. Notch; 24. Circuit board; 25. Electric control element. Specific embodiments

[0044] The content of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] As Figure 1 、 Figure 2 shown, a double-drive hair dryer includes an outer shell 1, a handle assembly 2 connected to the outer shell 1, a first fan unit 3, a heating unit 4, a first air inlet 5, and a first air outlet 6; the first air outlet 6 is provided at the front end of the outer shell 1;

[0046] The first fan unit 3 is used to suck air flow into the hair dryer from the first air inlet 5 and blow it out from the first air outlet 6 to form a main air duct 10, and the heating unit 4 is used to heat the air flow;

[0047] The first fan unit 3 includes a fan blade and a motor for driving the fan blade to rotate;

[0048] Among them, the first fan unit 3 is arranged in the handle assembly 2, and the first air inlet 5 is arranged on the handle assembly 2;

[0049] The hair dryer further includes a second fan unit 7 arranged in the outer shell 1, a second air inlet 8 arranged at the rear end of the outer shell 1, and a second air outlet 9 arranged at the front end of the outer shell 1. The second fan unit 7 sucks air flow into the outer shell 1 from the second air inlet 8 and blows it out from the second air outlet 9 to form an auxiliary air duct 11.

[0050] The arrangement of the first fan unit 3 and the second fan unit 7 has the advantage of increasing the air volume and air pressure. The second fan unit 7 also includes fan blades and a motor for driving the fan blades to rotate. The power of the second fan unit 7 is less than that of the first fan unit 3, that is, the motor power of the first fan unit 3 is greater than the motor power of the second fan unit 7, so that the air volume of the main air duct 10 is larger, achieving the purpose of quickly drying hair. The first fan unit 3 is arranged in the handle assembly 2 and the second fan unit 7 is arranged in the housing 1, making full use of the internal space of the hair dryer and balancing the weight of the hair dryer. The heating unit 4 can be arranged in the handle assembly 2 or in the housing 1. When the heating unit 4 is arranged in the housing 1, the second fan unit 7 is located upstream of the heating unit 4, so that the auxiliary air duct 11 can be formed and the air volume of the auxiliary air duct 11 can be guaranteed.

[0051] In one case, the main air duct 10 includes a first section extending along the axial direction of the shell 1 and a second section extending along the axial direction of the handle assembly 2. The connection between the handle assembly 2 and the shell 1 forms an air flow inlet for the air flow to enter the second section from the first section, and the second fan unit 7 is arranged upstream of the air flow inlet.

[0052] In another case, the main air duct 10 includes a first section extending along the axial direction of the housing 1 , and the second fan unit 7 is disposed between the rear end of the first section and the second air inlet 8 .

[0053] For the above two examples, Figures 2 to 4 As shown, the outer shell 1 is further provided with an inner cylinder 12 that defines the first section, and the rear end of the inner cylinder 12 is sealed by a seal. The seal includes a sealing plate 13 and a soft rubber pad or a soft rubber ring to prevent the airflow of the main air duct 10 from leaking out, causing a decrease in wind pressure and air volume. The seal includes a sealing plate 13, and the side of the sealing plate 13 facing the second air inlet 8 is provided with a mounting cavity 14 for mounting the second fan unit 7, and the second fan unit 7 is connected to the sealing plate 13 by screws. The shortest distance between the mounting cavity 14 and the second air inlet 8 is L, 5mm≤L≤25mm, preferably L=10mm, which ensures the installation of the fan unit while reducing the increase in the length of the outer shell 1 due to the setting of the second fan unit 7. The heating unit 4 is arranged in the inner cylinder 12, and the auxiliary air duct 11 includes a third section defined by the inner cylinder 12 and the outer shell 1. The third section extends around the first section, and a flowing heat-insulating space is formed by the third section of the auxiliary air duct 11 to take away the heat from the surface of the inner cylinder 12, thereby preventing the surface of the outer shell 1 from overheating due to long-term operation of the hair dryer.

[0054] It is understandable that for the above two examples, Figures 7 to 10As shown, a non-closed duct 18 defining a first section is further provided inside the housing 1. The non-closed duct 18 includes an inner wall 19 and an outer wall 20. The heating unit 4 is disposed between the inner wall 19 and the outer wall 20. The rear end of the non-closed duct 18 is sealed by a seal. The non-closed duct 18 has an open portion 21 extending along its axial direction. The heating unit 4 includes a heat-insulating member 22 having a hollow channel. The heat-insulating member 22 is provided with a notch 23 extending along its axial direction, and the notch 23 corresponds to the open portion 21. The inner wall 19 and the outer wall 20 may be integrally provided or separately provided. Preferably, the inner wall 19 and the outer wall 20 are integrally provided to prevent the airflow in the main air duct 10 from leaking from the axial mating gap between the two. The shape of the heat-insulating member 22 is substantially the same as the shape of the space enclosed by the inner wall 19 and the outer wall 20, so as to realize the assembly of the heating unit 4 in the space enclosed by the inner wall 19 and the outer wall 20.

[0055] The second fan unit 7 and the first section are coaxially arranged. Further, the second fan unit 7 and the third section are coaxially arranged. Wind loss is reduced.

[0056] The heating unit 4 does not start earlier than the first fan unit 3 and does not stop working later than the first fan unit 3, that is, the heating unit 4 starts at the same time as the first fan unit 3, or the first fan unit 3 starts earlier than the heating unit 4, and, the heating unit 4 stops working at the same time as the first fan unit 3, or the heating unit 4 stops working earlier than the first fan unit 3, to prevent the heating unit 4 from turning red or causing a more serious safety accident. The first fan unit 3 and the second fan unit 7 start at the same time, which is beneficial to timely form a flowing heat-insulating space inside the housing 1 and reduce the temperature rise of the housing 1;

[0057] It can be understood that the working states of the heating unit 4 and the first fan unit 3 remain unchanged. As in the previous example, the first fan unit 3 starts earlier than the second fan unit 7.

[0058] The heating unit 4 does not start earlier than the first fan unit 3 and does not stop working later than the first fan unit 3, and the first fan unit 3 and the second fan unit 7 stop at the same time; It can be understood that the working states of the heating unit 4 and the first fan unit 3 remain unchanged. As in the previous example, the second fan unit 7 stops earlier than the first fan unit 3.

[0059] In addition, as Figures 2 to 10As shown, another use of the second fan unit 7 is to dissipate heat from the electronic control components 25 inside the hair dryer. Specifically, the motor of the hair dryer in this example is a brushless motor, and the control circuit of the brushless motor is complex, including multiple high-power devices. During operation, a large amount of heat is generated per unit time. If it is not dissipated in time, the electronic control components 25 will be burned out and the hair dryer will fail. The electronic control components 25 are arranged in the auxiliary air duct 11, and the second fan unit 7 is used to dissipate heat from the electronic control components 25, improving the heat dissipation efficiency and extending the life of the motor.

[0060] As Figure 3 , 4 , 5, and 6 show that the electronic control components 25 are soldered on the circuit board 24, and the circuit board 24 is arranged at the rear end of the housing 1. Further, the circuit board 24 is located at the rear end of the housing 1. Preferably, the circuit board 24 is annular and sleeved on the outer wall 20 of the installation cavity 14 of the second fan unit 7. The sealing plate 13 is provided with air flow guiding grooves 15 corresponding to the electronic control components 25. There are multiple electronic control components 25 and multiple air flow guiding grooves 15. The second fan unit 7 sucks the air flow entering the auxiliary air duct 11 from the second air inlet 8 into the installation cavity 14, and then blows it to the electronic control components 25 through the air flow guiding grooves 15. The angle of the air flow direction change after entering the air flow guiding grooves 15 can be set according to the installation position of the electronic control components 25. Further improving the air guiding effect and the heat dissipation efficiency.

[0061] The air flow guiding grooves 15 are arranged opposite to the electronic control components 25. The electronic control components 25 are arranged facing the air flow guiding grooves 15, and the air flow can directly blow to the electronic control components 25 after the action of the air flow guiding grooves 15, effectively dissipating heat. Moreover, in order to reduce the space occupied by the electronic control components 25, the electronic control components 25 can partially extend into the air flow guiding grooves 15, but do not occupy the entire space of the air flow guiding grooves 15, that is, there is a gap between the electronic control components 25 and the bottom wall of the air flow guiding grooves 15, so that the air flow can blow to the electronic control components 25 through the air flow guiding grooves 15. Further, a plurality of partition plates 16 are arranged in the air flow guiding grooves 15, and the plurality of partition plates 16 divide the air flow guiding grooves 15 into a plurality of open grooves 17, and each open groove 17 corresponds to an electronic control component 25. Each electronic control component 25 has a corresponding air flow channel for targeted heat dissipation.

[0062] The air flow guiding grooves 15 are located outside the side wall of the installation cavity 14, and the air flow guiding grooves 15 are communicated with the installation cavity 14.

[0063] In order to make full use of the internal space of the hair dryer, as Figure 2 , 7As shown in Figures 6 and 9, in this example, it further includes an electric control component 25 disposed within the heating unit 4, or the electric control component 25 is arranged within the heating unit 4. The heating unit 4 includes a heat insulation member 22 having a hollow channel, and the electric control component 25 is disposed within the heat insulation member 22. The airflow generated by the second fan unit 7 enters the hollow channel to carry away the heat generated by the electric control component 25. In one example, a non-closed duct 18 defining a first section is further provided within the housing 1. The non-closed duct 18 includes an inner wall 19 and an outer wall 20. The heating unit 4 is disposed between the inner wall 19 and the outer wall 20. The rear end of the non-closed duct 18 is sealed by a seal, and the seal is located between the inner wall 19 and the outer wall 20. The non-closed duct 18 has an opening 21 extending along its axis. The heating unit 4 includes a heat insulation member 22 having a hollow channel, and the heat insulation member 22 is provided with a notch 23 extending along its axis, and the notch 23 corresponds to the opening 21. The electric control component 25 is disposed within the space between the inner wall 19 and the housing 1. The airflow generated by the second fan unit 7 enters the space between the inner wall 19 and the housing 1, which can not only carry away the heat generated by the electric control component 25, but also reduce the influence of the radiant heat of the heating unit 4 on the working performance of the electric control component 25 through the cold airflow of the auxiliary air duct 11.

[0064] The above embodiments are only the optimized embodiments of the present invention and not all embodiments of the present invention. According to the principle of the present invention, those skilled in the art can make various deformations. As long as they do not depart from the spirit of the present invention, they should fall within the scope defined by the claims of the present invention.

Claims

1. A dual-drive hair dryer, comprising a housing, a handle assembly connected to the housing, a first fan unit, a heating unit, a first air inlet and a first air outlet; the first air outlet is provided at the front end of the housing; the first fan unit is used to suck air flow into the hair dryer from the first air inlet and blow it out from the first air outlet to form a main air duct, and the heating unit is used to heat the air flow; the first fan unit includes a fan blade and a motor for driving the fan blade to rotate; characterized in that, The first fan unit is disposed within the handle assembly, and the first air inlet is provided on the handle assembly; the hair dryer further includes a second fan unit disposed within the housing, a second air inlet provided at the rear end of the housing, and a second air outlet provided at the front end of the housing. The second fan unit sucks air flow into the housing from the second air inlet and blows it out from the second air outlet to form an auxiliary air duct. The main air duct includes a first section extending along the axis of the housing. The second fan unit is disposed between the rear end of the first section and the second air inlet; The main air duct includes a first section extending along the axis of the housing and a second section extending along the axis of the handle assembly. An air flow inlet for the air flow to enter the second section from the first section is formed at the connection between the handle assembly and the housing. The second fan unit is disposed upstream of the air flow inlet.

2. The hair dryer according to claim 1, characterized in that, An inner cylinder defining the first section is further provided within the housing, and the rear end of the inner cylinder is sealed by a seal.

3. The hair dryer according to claim 2, wherein The seal includes a sealing plate, and an installation cavity for installing the second fan unit is provided on one side of the sealing plate facing the second air inlet.

4. The hair dryer according to claim 3, wherein The distance between the installation cavity and the second air inlet is L, where 5mm ≤ L ≤ 25mm.

5. The hair dryer according to claim 2, characterized in that, The heating unit is disposed within the inner cylinder. The auxiliary air duct includes a third section defined by the inner cylinder and the housing, and the third section extends around the first section.

6. The hair dryer according to claim 1, characterized in that, The second fan unit is coaxially arranged with the first section.

7. The hair dryer according to any one of claims 1 to 6, characterized in that The heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit. The first fan unit and the second fan unit start simultaneously; or, the heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit, and the first fan unit starts earlier than the second fan unit.

8. The hair dryer according to any one of claims 1 to 6, characterized in that, The heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit. The first fan unit and the second fan unit stop simultaneously; or, the heating unit does not start earlier than the first fan unit and does not stop working later than the first fan unit, and the second fan unit stops earlier than the first fan unit.

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