Hair drier

Abstract

The utility model discloses a hair dryer which comprises a handle, a main machine shell and an air outlet device, the handle is connected to the main machine shell, and the air outlet device is installed in the main machine shell. The main case is provided with an air inlet and an air outlet cylinder, the air inlet is located at the rear end of the main case, and the air outlet cylinder is located at the front end of the main case; the air outlet device comprises a centrifugal fan and a backflow pipeline, the centrifugal fan is provided with an air inlet end and an air outlet end, the air inlet end is communicated with the rear end of the backflow pipeline and the air inlet, and the air outlet end is communicated with the front end of the backflow pipeline and the air outlet barrel. According to the embodiment of the utility model, the centrifugal fan is used for supplying air, a part of hot air blown out from the air outlet end of the centrifugal fan is re-drained to the air inlet end and is compressed and heated again by utilizing the principle that the centrifugal fan can compress air to generate heat in the high-speed operation process and matching with the arranged backflow pipeline, and the circulation is repeated, so that the heat energy utilization rate is improved. The temperature of hot air blown out by the centrifugal fan is gradually increased, the effect of replacing heating wires for heating is achieved, and the air blower is more energy-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a hair dryer. Background Art

[0002] A hair dryer is a small personal care appliance that can quickly dry hair. It heats the hair with a heating wire to make the wind hot, so that the hair can be dried faster, shortening the time of drying hair and making people's lives more convenient. Existing hair dryers are generally composed of a group of heating wires and a high-speed fan. When powered on, the heating wires will generate heat, and the wind blown by the fan will become hot wind after passing through the heating wires. If only the fan rotates and the heating wire does not heat up, then the wind blown out is just cold wind.

[0003] However, this type of hair dryer using a heating wire has a relatively high power, usually between 600W and 2000W, resulting in a high power consumption per unit time and a poor energy-saving effect. Utility Model Content

[0004] In view of this, the utility model provides a hair dryer, which is used to solve the problem that the hair dryer in the prior art has high power and poor energy-saving effect.

[0005] To achieve one or part or all of the above purposes or other purposes, the utility model proposes: a hair dryer, comprising: a handle, a main housing and an air outlet device, wherein the handle is connected to the main housing, and the air outlet device is installed in the main housing;

[0006] The main housing is provided with an air inlet and an air outlet, the air inlet is located at the rear end of the main housing, and the air outlet is connected to the front end of the main housing;

[0007] The air outlet device includes a centrifugal fan and a return duct. The centrifugal fan has an air inlet end and an air outlet end. The air inlet end is respectively connected to the rear end of the return duct and the air inlet, and the air outlet end is respectively connected to the front end of the return duct and the air outlet tube.

[0008] Preferably, the air inlet end is provided with an air inlet nozzle, the air outlet end is connected to an air outlet duct, the front end of the return duct passes through the side wall of the air outlet duct and is connected to the air outlet duct, and the rear end of the return duct passes through the side wall of the air inlet nozzle and is connected to the air inlet nozzle.

[0009] Preferably, the air inlet nozzle is provided with a control valve, and the control valve is used to control the opening and closing of the rear end of the return pipe.

[0010] Preferably, the air inlet nozzle is in a trumpet shape that gradually becomes larger from the inside to the outside.

[0011] Preferably, the air outlet cylinder comprises an outer cylinder and an inner cylinder which are sleeved with each other, and an air outlet channel is formed between the outer cylinder and the inner cylinder.

[0012] Preferably, the air outlet channel gradually narrows from inside to outside.

[0013] Preferably, a plurality of guide vanes are distributed circumferentially in the air outlet channel, and the guide vanes are arranged obliquely along the axis of the inner cylinder.

[0014] Preferably, the side wall of the inner cylinder is provided with a plurality of ventilation pipes, and the ventilation pipes penetrate the side wall of the outer cylinder outwardly and communicate with the outside.

[0015] Preferably, a drive motor is also provided in the main housing, and the drive motor is connected to the front end of the centrifugal fan. A plurality of heat dissipation holes are provided on the side wall of the main housing away from the drive motor, and the heat dissipation holes are connected to the interior of the main housing.

[0016] Preferably, a heat dissipation pipe communicating with the interior of the main casing is provided at the rear end of the inner cylinder, and the inner end of the heat dissipation pipe is close to the driving motor.

[0017] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0018] After adopting the above-mentioned hair dryer, air is supplied through the set centrifugal fan. By utilizing the principle that the centrifugal fan will compress the air and generate heat during high-speed operation, a part of the hot air blown out from the air outlet of the centrifugal fan is redirected to the air inlet end and compressed and heated again. This cycle is repeated, so that the temperature of the hot air blown out by the centrifugal fan gradually increases, thereby achieving the effect of replacing the heating wire heating, making the hair dryer more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] in:

[0021] Figure 1 This is a schematic diagram of the overall structure of the hair dryer proposed by the utility model;

[0022] Figure 2 This is a structural schematic diagram of the air outlet device of the hair dryer proposed by the utility model;

[0023] Figure 3This is a schematic diagram of the structure of the air outlet tube of the hair dryer proposed by the utility model;

[0024] Figure 4 The cross-sectional structure of the hair dryer proposed by the utility model is shown in FIG. Figure 1 ;

[0025] Figure 5 The cross-sectional structure of the hair dryer proposed by the utility model is shown in FIG. Figure 2 .

[0026] Reference numerals:

[0027] 10. Handle;

[0028] 20. Main housing; 21. Air inlet; 22. Air outlet; 221. Outer tube; 222. Inner tube; 223. Air outlet channel; 224. Guide vane; 225. Ventilation pipe; 226. Heat dissipation pipe; 23. Driving motor; 24. Heat dissipation hole;

[0029] 30. Air outlet device; 31. Centrifugal fan; 311. Air inlet end; 3111. Air inlet nozzle; 312. Air outlet end; 3121. Air outlet duct; 32. Return duct; 33. Control valve. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0033] like Figure 1-5 The example shown is an embodiment provided by the utility model.

[0034] The embodiment of the utility model provides a hair dryer, comprising: a handle 10, a main housing 20 and an air outlet device 30, wherein the handle 10 is connected to the main housing 20, and the air outlet device 30 is installed in the main housing 20, and the handle 10 is a hollow structure, in which necessary functional components such as a power supply and a control circuit board can be installed. The main housing 20 is provided with an air inlet 21 and an air outlet 22, wherein the air inlet 21 is located at the rear end of the main housing 20, and the air outlet 22 is connected to the front end of the main housing 20, and when the hair dryer is used, external air is sucked in from the air inlet 21 and blown out from the front end of the air outlet 22. The air outlet device 30 includes a centrifugal fan 31 and a return duct 32. The centrifugal fan 31 can adopt a miniature high-pressure fan, and its rated power generally does not exceed 200W. The centrifugal fan 31 has an air inlet end 311 and an air outlet end 312. The air inlet end 311 of the centrifugal fan 31 is located at the rear of the centrifugal fan 31 and faces the air inlet 21 located at the rear end of the main housing 20. The air outlet end 312 of the centrifugal fan 31 is located on the side wall of the centrifugal fan 31. It is necessary to extend the port or connect the duct so that the air outlet end 312 faces the air outlet tube 22 at the front end of the main housing 20. The air inlet end 311 of the centrifugal fan 31 is respectively connected to the rear end of the return duct 32 and the air inlet 21, and the air outlet end 312 of the centrifugal fan 31 is respectively connected to the front end of the return duct 32 and the air outlet tube 22. The return duct 32 is arranged on the side of the centrifugal fan 31, and the rear end of the return duct 32 is connected from the side to the air path formed by the air inlet 21 of the main casing 20 and the air inlet end 311 of the centrifugal fan 31, and the front end of the return duct 32 is connected from the side to the air path formed by the air outlet of the main casing 20 and the air outlet end 312 of the centrifugal fan 31.

[0035] When the centrifugal fan 31 is working, the outside air is sucked into the wind cavity of the centrifugal fan 31 from the air inlet 21 through the air inlet end 311, and under the action of negative pressure, the air in the return duct 32 is also sucked into the wind cavity of the centrifugal fan 31 together with the outside air. After the high-speed rotation of the impeller of the centrifugal fan 31, the air pressure in the wind cavity becomes larger. The increase in air pressure is often accompanied by an increase in temperature, and the high-speed rotation of the impeller will also continuously rub against the air to generate heat, so that the temperature of the air in the wind cavity increases, and then the air is discharged from the air outlet end 31. 12 blows out, after the hot air with a certain amount of heat is blown out from the air outlet end 312, most of it is blown out directly from the air outlet tube 22, and a small part is sucked into the return duct 32. The hot air entering the return duct 32 is sucked back into the centrifugal fan 31, so that the air temperature in the air cavity of the centrifugal fan 31 is further increased. In this way, the temperature in the air cavity of the centrifugal fan 31 gradually accumulates and increases, and the temperature of the hot air blown out from the centrifugal fan 31 will also gradually increase, and finally reach a heating effect equal to or exceeding that of the traditional electric heating wire. In the embodiment of the utility model, the hot air is generated by the centrifugal fan 31 and the return duct 32, which replaces the traditional way of generating hot air by the electric heating wire of the hair dryer, and the power required by the micro centrifugal fan 31 (generally not more than 200W) is much smaller than the power required by the electric heating wire in the traditional hair dryer (600W-2000W), which can achieve a more energy-saving effect.

[0036] Specifically, in order to facilitate the docking of the return duct 32 and the centrifugal fan 31, the air inlet end 311 of the centrifugal fan 31 is provided with an air inlet nozzle 3111, the air outlet end 312 of the centrifugal fan 31 is connected with an air outlet duct 3121, the front end of the return duct 32 penetrates the side wall of the air outlet duct 3121 and is connected to the air outlet duct 3121, and the rear end of the return duct 32 penetrates the side wall of the air inlet nozzle 3111 and is connected to the air inlet nozzle 3111. In addition, in order to improve the air volume and the efficiency of hot air reflow, in this embodiment, two air outlet ducts 3121 and two return ducts 32 are respectively provided, and the air outlet ducts 3121 and the return ducts 32 are staggered in pairs along the circumferential direction of the side wall of the centrifugal fan 31, and the two air outlet ducts 3121 are symmetrically arranged, and the two return ducts 32 are symmetrically arranged. Among them, the outer edge of the air inlet nozzle 3111 is tightly connected to the rear end edge of the main casing 20, and the inner end of the air inlet nozzle 3111 is connected to the air inlet end 311 of the centrifugal fan 31. The air inlet nozzle 3111 is in a trumpet shape that gradually becomes larger from the inside to the outside, which can increase the flow rate and wind pressure of the incoming air.

[0037] Furthermore, the air inlet nozzle 3111 is provided with a control valve 33, which is used to control the opening and closing of the rear end of the return pipe 32. The number of control valves 33 can be set according to the number of return pipes 32, and each control valve 33 controls the opening and closing of a return pipe 32 separately. The opening and closing adjustment of the control valve 33 is equivalent to the temperature gear switch adjustment of the traditional hair dryer. When the user only needs to use the wind at normal temperature, all the return pipes 32 are closed to cut off the path of the hot air return, so that the wind blown by the centrifugal fan 31 is only slightly higher than the room temperature; when the user needs to use warm air or hot air, it can be adjusted by opening one control valve 33 or opening all control valves 33. The more the number of return pipes 32 connected, the faster the heating efficiency of the centrifugal fan 31 will be, and the temperature will be correspondingly higher. It is worth mentioning that the form of the control valve 33 can be selected from the conventional and simple pipeline control valve 33 on the market, and the structure of the control valve 33 in the drawings of this embodiment is only for illustration.

[0038] Furthermore, the air outlet cylinder 22 includes an outer cylinder 221 and an inner cylinder 222 which are connected to each other. The outer cylinder 221 is in a regular cylindrical shape, and the inner cylinder 222 is in a conical shape which gradually becomes larger from the inside to the outside. An air outlet channel 223 is formed between the outer cylinder 221 and the inner cylinder 222. The cross-sectional width of the air outlet channel 223 gradually becomes narrower from the inside to the outside, so that the wind speed finally blown out from the front end of the air outlet cylinder 22 is higher.

[0039] Furthermore, a plurality of guide vanes 224 are distributed circumferentially in the air outlet channel 223, and the guide vanes 224 are arranged obliquely along the axis of the inner cylinder 222. In the present embodiment, three guide vanes 224 are evenly distributed on the side wall of the inner cylinder 222 near the rear end. When the wind is blown out from the air outlet end 312 of the centrifugal fan 31 into the air outlet channel 223, and then when passing through the guide vanes 224, the wind will be blocked by the guide vanes 224 and deviate. Under the action of the three guide vanes 224 inclined in the same direction, the wind will gradually form a rotating airflow, thereby forming a certain centrifugal force on the outlet air, so that the wind speed when the wind is finally blown out is also higher.

[0040] Furthermore, a plurality of ventilation pipes 225 are arranged on the side wall of the inner cylinder 222, and the ventilation pipes 225 penetrate the side wall of the outer cylinder 221 outwardly and are connected with the outside. Since the wind is blown out at high speed from the interlayer between the outer cylinder 221 and the inner cylinder 222, negative pressure will be formed at the front end of the inner cylinder 222, which will affect the wind speed on the one hand and reduce the wind volume on the other hand. By arranging the ventilation pipes 225 near the rear end of the inner cylinder 222, the inner cylinder 222 is connected with the outside. The external air will be sucked into the inner cylinder 222 under the action of the negative pressure at the front end of the inner cylinder 222, and will be blown out together with the wind blown out at high speed from the air outlet channel 223, which can reduce the influence of negative pressure on the wind speed and air volume.

[0041] Furthermore, a driving motor 23 is also provided in the main housing 20, and the driving motor 23 is connected to the front end of the centrifugal fan 31. A plurality of heat dissipation holes 24 are provided on the side wall of the main housing 20 away from the driving motor 23. The heat dissipation holes 24 are connected to the interior of the main housing 20. A heat dissipation pipe 226 connected to the interior of the main housing 20 is provided at the rear end of the inner cylinder 222, and the inner end of the heat dissipation pipe 226 is close to the driving motor 23. The heat dissipation holes 24 connect the air inside the main housing 20 with the outside air, and the heat dissipation pipe 226 connects the air inside the main housing with the air inside the inner cylinder 222. Under the action of the negative pressure at the front end of the inner cylinder 222, the outside air will be sucked into the main housing 20 from the heat dissipation holes 24. The outside air temperature is relatively low. When passing through the centrifugal fan 31 and the driving motor 23 in sequence, the heat emitted from the outside of the two can be taken out, which plays a role of auxiliary heat dissipation.

[0042] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A hair dryer, characterized in that: include: A handle (10), a main housing (20) and an air outlet device (30), wherein the handle (10) is connected to the main housing (20) and the air outlet device (30) is installed in the main housing (20); The main housing (20) is provided with an air inlet (21) and an air outlet (22), wherein the air inlet (21) is located at the rear end of the main housing (20), and the air outlet (22) is connected to the front end of the main housing (20); The air outlet device (30) comprises a centrifugal fan (31) and a return duct (32); the centrifugal fan (31) has an air inlet end (311) and an air outlet end (312); the air inlet end (311) is respectively connected to the rear end of the return duct (32) and the air inlet (21); and the air outlet end (312) is respectively connected to the front end of the return duct (32) and the air outlet cylinder (22).

2. The hair dryer according to claim 1, characterized in that: The air inlet end (311) is provided with an air inlet nozzle (3111), the air outlet end (312) is connected to an air outlet duct (3121), the front end of the return duct (32) passes through the side wall of the air outlet duct (3121) and is connected to the air outlet duct (3121), and the rear end of the return duct (32) passes through the side wall of the air inlet nozzle (3111) and is connected to the air inlet nozzle (3111).

3. The hair dryer according to claim 2, characterized in that: The air inlet nozzle (3111) is provided with a control valve (33), and the control valve (33) is used to control the opening and closing of the rear end of the return pipe (32).

4. The hair dryer according to claim 2, characterized in that: The air inlet nozzle (3111) is in the shape of a trumpet that gradually becomes larger from the inside to the outside.

5. The hair dryer according to claim 1, characterized in that: The air outlet cylinder (22) comprises an outer cylinder (221) and an inner cylinder (222) which are sleeved together, and an air outlet channel (223) is formed between the outer cylinder (221) and the inner cylinder (222).

6. The hair dryer according to claim 5, characterized in that: The air outlet channel (223) gradually narrows from the inside to the outside.

7. The hair dryer according to claim 6, characterized in that: A plurality of guide vanes (224) are distributed in the circumferential direction in the air outlet channel (223), and the guide vanes (224) are arranged obliquely along the axis of the inner cylinder (222).

8. The hair dryer according to claim 5, characterized in that: The side wall of the inner cylinder (222) is provided with a plurality of ventilation pipes (225), and the ventilation pipes (225) penetrate the side wall of the outer cylinder (221) outward and communicate with the outside.

9. The hair dryer according to claim 8, characterized in that: A drive motor (23) is also provided in the main housing (20), and the drive motor (23) is connected to the front end of the centrifugal fan (31). A plurality of heat dissipation holes (24) are provided on a side wall of the main housing (20) at an end away from the drive motor (23), and the heat dissipation holes (24) are connected to the interior of the main housing (20).

10. The hair dryer according to claim 9, characterized in that: A heat dissipation pipe (226) communicating with the interior of the main housing (20) is disposed at the rear end of the inner cylinder (222), and the inner end of the heat dissipation pipe (226) is close to the drive motor (23).

Images