Air blower capable of increasing air flow based on negative pressure flow increasing structure

Abstract

The invention relates to the technical field of hair driers, in particular to a hair dryer capable of increasing airflow flow based on a negative pressure flow increasing structure, which comprises a hair dryer part and a handle part butted with the hair dryer part, the hair dryer part is provided with an annular cavity and a mixing cavity, the front end of the mixing cavity is provided with a main air outlet, and the rear end of the mixing cavity is provided with a flow increasing air inlet; a main air inlet is formed in the lower end of the handle part, the upper end of the handle part is communicated with the annular cavity, a longitudinal fluid channel from the main air inlet to the annular cavity is formed in the handle part, a pressurizing unit is arranged in the longitudinal fluid channel, and a heating unit is arranged on the middle section of the mixing cavity; the coanda effect is ingeniously utilized, the negative pressure flow increasing structure is optimized, fluid can more efficiently flow to the mixing cavity from the annular cavity, then high-speed airflow flows out through the annular nozzle to form negative pressure, and surrounding air can be better attracted to enter from the flow increasing air inlet to form flow increasing airflow to move forwards.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dryers, and particularly to a hair dryer that increases the air flow rate based on a negative pressure flow-increasing structure. Background Art

[0002] In the field of personal care appliances, as a commonly used hair styling tool, the technical development of hair dryers has always been highly concerned. With the continuous improvement of consumers' requirements for the performance of hair dryers, the design of hair dryers is also constantly innovating.

[0003] In existing hair dryers, in order to additionally increase the air flow rate entering the hair dryer, a hollow structure is mainly adopted inside the air duct. When the air flows out, the increase in the wind speed attracts a small amount of air to flow towards the air outlet of the hair dryer together. However, the current air flow multiplication hair dryers still have significant deficiencies in practical applications. Among them, except for the motor drive, only a small amount of air is attracted to flow into the hair dryer interior, that is, the increased air volume by adopting the multiplication structure is small; the heating of the additionally inhaled air volume is not considered, which will cause the temperature of the air blown out by the hair dryer to drop and the effect of drying hair to decline. Although a little air volume is increased, the overall temperature of the air flow at the air outlet also decreases, and the efficiency of drying hair is not improved effectively. Summary of the Invention

[0004] The present invention aims to provide a technical solution to solve the above problems in order to overcome the above situations.

[0005] A hair dryer that increases the air flow rate based on a negative pressure flow-increasing structure, including an air duct part and a handle part docked to the air duct part. The air duct part has an annular cavity, a mixing cavity, and a multi-stage annular ring. A main air outlet is provided at the front end of the mixing cavity, and a flow-increasing air inlet is provided at the rear end of the mixing cavity. A main air inlet is provided at the lower end of the handle part, and the upper end of the handle part is communicated with the annular cavity, so that a longitudinal fluid channel from the main air inlet to the annular cavity is formed inside the handle part. A pressurizing unit is provided in the longitudinal fluid channel, and a heating unit is provided in the middle section of the mixing cavity; The multi-stage annular ring is arranged between the annular cavity and the mixing cavity. An annular nozzle communicating with the annular cavity and the mixing cavity is formed between adjacent two-stage annular rings, and the annular nozzle faces the main air outlet. An arc-shaped protrusion extending inside the annular cavity is formed on each annular ring in front of each annular nozzle, so that an arc-shaped transition structure is formed from the annular cavity to the mixing cavity for the annular nozzle; The main air inlet, the longitudinal fluid channel, the heating unit, the annular cavity, and the annular nozzle form a negative pressure flow-increasing structure to generate a flow-increasing air flow that enters from the flow-increasing air inlet and then flows out from the main air outlet in the mixing cavity.

[0006] Preferably, the annular cavity has a diversion cavity with a tapered outer side and a transition cavity connected to the diversion cavity. The outer side of the diversion cavity forms an angle of 30°-45° with the horizontal direction. The inner side of the diversion cavity consists of multiple annular rings. The multiple annular rings are stepped from front to back and the inner diameter gradually decreases. The transition cavity is connected to the inside of the handle part.

[0007] Preferably, the outer side of the diversion cavity and the last annular ring form an arc transition at the rear end and are arranged as a flow-increasing air inlet.

[0008] Preferably, the distance between two adjacent annular rings is 0.4mm-1mm.

[0009] Preferably, the transition cavity is a cavity structure arranged horizontally. Its cross-sectional area S12 is set to be larger than the cross-sectional area S11 of the handle part, and the horizontal length L12 of the transition cavity should be greater than 1.5 times to 2.5 times the inner diameter D11 of the handle part.

[0010] Preferably, the cross-sectional area S21 of the flow-increasing air inlet is set to be smaller than the cross-sectional area S24 of the main air outlet.

[0011] Preferably, the heating unit is arranged between the main air outlet and the annular nozzle, and there is a distance between the heating unit and the annular nozzle so that the fluid entering the mixing cavity from the annular nozzle and the flow-increasing air inlet can be fully mixed.

[0012] Preferably, connection points are arranged between two adjacent annular rings, and the two adjacent annular rings are connected through the connection points.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: By forming multiple annular rings between the annular cavity and the mixing cavity, an annular nozzle is formed between two adjacent annular rings facing the main air outlet, and an arc-shaped protrusion extending within the annular cavity is formed on each annular ring in front of each annular nozzle, so that the annular nozzle forms a structure with an arc transition from the annular cavity to the mixing cavity; the Coanda effect is skillfully utilized to optimize the negative-pressure flow-increasing structure, enabling the fluid to flow more efficiently from the annular cavity to the mixing cavity, and then a high-speed air flow is formed by flowing out through the annular nozzle to generate negative pressure, which can better attract the surrounding air to enter from the flow-increasing air inlet to form a flow-increasing air flow and move forward. This not only improves the overall performance of the hair dryer and the efficiency of drying hair, but also greatly improves the user experience, significantly enhances the air multiplication effect, and can greatly shorten the hair drying time compared with traditional hair dryers, saving valuable energy for users.

[0014] In addition, the heating unit heats all the air entering the mixing cavity, ensuring that the additionally inhaled air can also reach an appropriate temperature, avoiding the reduction of the air temperature caused by the increase in air volume, guaranteeing the effect of drying hair, improving the comfort and hair styling efficiency of users during use, and achieving a double breakthrough in the performance and practicality of the hair dryer.

[0015] A heating unit is provided in the middle section of the mixing chamber, so that the fluid entering along the annular nozzle and the back pressure air inlet can pass through the heating unit for heating and then be blown out from the main air outlet, thereby improving the hair drying effect.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of the present invention from one perspective; Figure 2 is a schematic structural diagram of the present invention from another perspective; Figure 3 is a schematic cross-sectional structural diagram of the present invention; Figure 4 is the present invention Figure 3 a schematic structural diagram of the part A in; Figure 5 is the present invention Figure 3 a schematic structural diagram of the part B in; Figure 6 is a schematic cross-sectional structural diagram of the air duct part of the present invention; Figure 7 is a diagram of the air flow generated solely by the rotation of the high-speed motor of the present invention; Figure 8 is a diagram of the air flow generated by the Bernoulli principle and the Coanda effect of the present invention; Figure 9 is a diagram of the total air flow generated during the operation of the present invention.

[0019] The reference numerals and names in the drawings are as follows: Air duct part 10, annular cavity 11, diversion cavity 111, transition cavity 112, mixing chamber 12, main air outlet 13, flow increasing air inlet 14, heating unit 15, handle part 20, main air inlet 21, pressurizing unit 22, annular ring 30, annular nozzle 31, arc-shaped protrusion 32, connection point 33. Detailed Embodiments

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1-6 , in the embodiment of the present invention, a hair dryer that increases the air flow rate based on a negative pressure flow increasing structure includes a barrel part 10 and a handle part 20 docked to the barrel part 10. The barrel part 10 has an annular cavity 11 and a mixing cavity 12. A main air outlet 13 is provided at the front end of the mixing cavity 12, and a flow increasing air inlet 14 is provided at the rear end of the mixing cavity 12. A main air inlet 21 is provided at the lower end of the handle part 20, and the upper end of the handle part 20 is communicated with the annular cavity 11, so that a longitudinal fluid passage from the main air inlet 21 to the annular cavity 11 is formed inside the handle part 20. A pressurizing unit 22 is provided in the longitudinal fluid passage, and a heating unit 15 is provided in the middle section of the mixing cavity 12; A plurality of annular rings 30 are formed between the annular cavity 11 and the mixing cavity 12. An annular nozzle 31 facing the main air outlet 13 is formed between adjacent two annular rings 30, and an arc-shaped protrusion 32 extending inside the annular cavity 11 is formed on each annular ring 30 in front of each annular nozzle 31, so that the last-stage annular nozzle 31 forms a structure with an arc-shaped transition between the annular cavity 11 and the mixing cavity 12; The main air inlet 21, the longitudinal fluid passage, the pressurizing unit 22, the annular cavity 11 and the annular nozzle 31 form a negative pressure flow increasing structure to generate an increasing flow air current that enters from the flow increasing air inlet 14 and then flows out from the main air outlet 13 in the mixing cavity 12.

[0022] After the hair dryer is started, the pressurizing unit 22 operates in the longitudinal fluid passage of the handle part 20, driving air to enter from the main air inlet 21 at the lower end of the handle part 20 and enter the annular cavity 11 along the longitudinal fluid passage. Between the annular cavity 11 and the mixing cavity 12, the plurality of annular rings 30 and the arc-shaped protrusions 32 constitute a special flow guiding structure, and the air is ejected at a high speed through the annular nozzles 31 between adjacent annular rings 30 to form a high-speed transverse air current. Due to the high-speed ejection of the air current, a negative pressure area is formed in the mixing cavity 12, and a pressure difference is formed with the external environment of the flow increasing air inlet 14, so that the external air quickly rushes in through the flow increasing air inlet 14 at the rear end of the mixing cavity 12 under the action of the pressure difference. The inhaled air current is mixed with the air current ejected from the annular nozzle 31 in the mixing cavity 12, and then is heated by the heating unit 15 in the middle section of the mixing cavity 12, and finally is blown out from the main air outlet 13 at the front end of the mixing cavity 12 to achieve efficient hair drying.

[0023] In the above technical solution, the design of the negative-pressure flow-increasing structure makes use of the Bernoulli principle and the Coanda effect. A high-speed motor is used as the power source of the hair dryer, that is, the pressurizing unit 22. The air flow generated solely by the rotation of the high-speed motor is as shown in Figure 7 ; the air flow attracted by the negative-pressure flow-increasing structure is as shown in Figure 8 ; through the drive of the high-speed motor and the flow channel design of this solution, the air flow generated by the high-speed motor mainly blows out along the inner wall. The high-speed air flow is ejected through the annular nozzle 31 to form a negative pressure in the mixing chamber 12. The external air is sucked in through the flow-increasing air inlet 14 by the negative pressure to form an air flow. The two air flows are mixed in the mixing chamber 12 and finally blown out from the main air outlet 13. The mixed air flow is as shown in Figure 9 ; By forming a multi-stage annular ring 30 between the annular chamber 11 and the mixing chamber 12, an annular nozzle 31 facing the main air outlet 13 is formed between adjacent two-stage annular rings 30, and an arc-shaped protrusion 32 extending within the annular chamber 11 is formed on each annular ring 30 in front of each annular nozzle 31, so that the final-stage annular nozzle 31 forms a structure with an arc-shaped transition between the annular chamber 11 and the mixing chamber 12; the Coanda effect is skillfully utilized to optimize the negative-pressure flow-increasing structure, enabling the fluid to flow more smoothly from the annular chamber 11 to the mixing chamber 12. Based on the negative pressure formed by the high-speed air flow formed by the annular nozzle, it can better drive the surrounding air to enter from the flow-increasing air inlet to form an increased-flow air flow and move forward, which not only improves the overall performance of the hair dryer, but also greatly improves the user experience, significantly increases the air flow rate entering the fan, and can greatly shorten the hair drying time compared with traditional hair dryers, saving valuable energy for users.

[0024] In addition, the heating unit 15 heats all the air entering the mixing chamber 12, ensuring that the additionally inhaled air can also reach an appropriate temperature, avoiding the reduction of the air temperature caused by the increase in air volume, guaranteeing the effect of drying hair, improving the comfort and hair styling efficiency of the user during use, and achieving a double breakthrough in the performance and practicality of the hair dryer.

[0025] Please refer to Figures 3-5, the annular cavity 11 has a tapered diversion cavity 111 and a transition cavity 112 connected to the diversion cavity 111. The outer side of the diversion cavity 111 forms an angle of 30° - 45° with the horizontal direction. The inner side of the diversion cavity 111 is composed of multiple annular rings 30. The multiple annular rings 30 are stepped from front to back and the inner diameter gradually decreases. The transition cavity 112 is connected to the inside of the handle part 20, which can effectively guide the airflow to accelerate, so that more air is inhaled from the flow-increasing air inlet 14; the outer side and the inner side of the diversion cavity 111 form an arc transition at the rear end and are set as the flow-increasing air inlet 14, which reduces the resistance of the airflow and reduces energy loss; the distance between adjacent two annular rings 30 is 0.4mm - 1mm, ensuring that the airflow is ejected at a high speed to form a negative pressure; the transition cavity 112 is a cavity structure arranged horizontally. In order to avoid an increase in air resistance, its cross-sectional area S 12 is set to be larger than the cross-sectional area S of the handle part 20 11 , and the horizontal length L of the transition cavity 112 12 should be greater than 1.5 - 2.5 times the inner diameter D of the handle part 20 11 , effectively avoiding an increase in air resistance and ensuring that air smoothly flows into the annular cavity 11; the cross-sectional area S21 of the flow-increasing air inlet 14 is set to be smaller than the cross-sectional area S24 of the main air outlet 13, avoiding an increase in resistance, pushing the airflow to move forward quickly, and realizing efficient air outlet.

[0026] When using the hair dryer, the pressurizing unit 22 starts to work, driving the gas to enter the handle part 20 from the main air inlet 21 to form an air flow. Subsequently, the air flow enters the transition cavity 112 from the handle part 20. In order to avoid an increase in air resistance, the cross-sectional area S of the transition cavity 112 12 should be larger than the cross-sectional area S of the handle part 20 11 , but should not be much larger than the cross-sectional area of the handle part 20 times, that is . After passing through the transition cavity 112, it enters the diversion cavity (111) and is blown into the mixing cavity 12 from the annular nozzle 31. Among them, the negative pressure flow-increasing structure is the core component of this hair dryer. The negative pressure generating structure is provided with a diversion cavity 111, multiple annular rings 30 and an annular nozzle 31. The diversion cavity 111 is a tapered cavity. According to the continuity equation and the Bernoulli equation, the purpose is that after the air flow enters, due to the gradually decreasing cross-sectional area, the speed will gradually increase and the pressure will gradually decrease. Among them, the continuity equation is: , and the Bernoulli equation is: . According to the principle of aerodynamics, at this time, the pressure variable is relatively small, so the corresponding , and at this time is the air density under normal temperature and pressure. Therefore, the continuity equation is simplified to: ; the Bernoulli equation is simplified to: ; When the area decreases, according to the continuity equation, will increase, and according to Bernoulli's equation, the pressure will decrease at this time.

[0027] Therefore, the air flow passes through the negative-pressure flow-increasing structure, accelerates to form a high-speed air flow, and then is ejected from the annular nozzle 31. At this time, the speed reaches the maximum, and a negative pressure will be formed in the subsequent connected mixing chamber 12. When entering the annular nozzle 31 from the diversion chamber 111, it will pass through the arc-shaped protrusion 32. According to the Coanda effect, when the air flow passes through the curved surface, due to the viscosity of the gas, the air flow will flow along the curved surface, avoiding the flow separation of the air flow when entering the annular nozzle 31 from the diversion chamber 111 and reducing the energy loss.

[0028] As mentioned above, the high-speed air flow is ejected from the annular nozzle 31, and a negative pressure will be formed in the mixing chamber 12. The pressure at the double-pressure air inlet 14 is the atmospheric environment, that is, the pressure is 1 atm, and the relative pressure shown by the pressure gauge is 0 Pa. It can be seen that a pressure difference will be formed between the mixing chamber 12 and the double-pressure air inlet 14; according to Bernoulli's equation, Among them, is the energy loss caused by viscous force, etc. , and the increased flow rate can be estimated through CFD technology based on data such as the pressurizing unit.

[0029] Finally, the air flow driven by the blower 22 and the air flow attracted by the negative-pressure flow-increasing structure are mixed in the mixing chamber 12 and then enter the heating unit 15 together. The heating unit 15 heats the air flow to a certain temperature and blows it out from the air outlet to act on the hair.

[0030] Please refer to Figure 3 and Figure 6 , the heating unit 15 is arranged between the main air outlet 13 and the flow-increasing air inlet 14, which can heat the air immediately after entering the mixing chamber 12, reduce the heat loss during the transmission process, ensure that the temperature of the blown air is stable and efficient. There is a connection point 33 between adjacent two-stage annular rings 30, and adjacent two-stage annular rings 30 are connected through the connection point 33, enhancing the overall structural stability of the annular chamber 11, avoiding the loosening or deformation of the annular ring 30 caused by the vibration generated by the high-speed flow of the air flow, and then ensuring that the air flow can be stably and smoothly ejected from the first annular air outlet, continuously forming a negative pressure, and improving the air intake volume and blowing efficiency; this connection method also reduces the manufacturing and assembly difficulty, facilitates the later maintenance and repair, and further enhances the comprehensive advantages of the hair dryer in terms of performance guarantee and use convenience.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A hair dryer that increases the air flow rate based on a negative pressure flow-increasing structure, characterized in that, It includes a blower tube part (10) and a handle part (20) docked to the blower tube part (10). The blower tube part (10) has an annular cavity (11), a mixing cavity (12) and a multi-stage annular ring (30). A main air outlet (13) is provided at the front end of the mixing cavity (12), and an air flow increasing inlet (14) is provided at the rear end of the mixing cavity (12). A main air inlet (21) is provided at the lower end of the handle part (20). The upper end of the handle part (20) is communicated with the annular cavity (11), so that a longitudinal fluid channel from the main air inlet (21) to the annular cavity (11) is formed inside the handle part (20). A pressurizing unit (22) is arranged in the longitudinal fluid channel, and a heating unit (15) is arranged in the middle section of the mixing cavity (12); The multi-stage annular ring (30) is arranged between the annular cavity (11) and the mixing cavity (12). An annular nozzle (31) communicating with the annular cavity (11) and the mixing cavity (12) is formed between two adjacent stages of the annular rings (30). The annular nozzle (31) faces the main air outlet (13), and an arc-shaped protrusion (32) extending within the annular cavity (11) is formed on each annular ring (30) in front of each annular nozzle (31), so that an arc-shaped transition structure is formed between the annular nozzle (31) from the annular cavity (11) to the mixing cavity (12); The main air inlet (21), the longitudinal fluid channel, the pressurizing unit (22), the annular cavity (11) and the annular nozzle (31) form a negative pressure air flow increasing structure to generate an air flow increasing air flow that enters from the air flow increasing inlet (14) and then flows out from the main air outlet (13) in the mixing cavity (12).

2. The hair dryer for increasing air flow based on a negative pressure flow increasing structure according to claim 1, wherein The annular cavity (11) has a diversion cavity (111) with a gradually shrinking outer side and a transition cavity (112) docked to the diversion cavity (111). The outer side of the diversion cavity (111) forms an angle of 30° - 45° with the horizontal direction. The inner side of the diversion cavity (111) is composed of multi-stage annular rings (30). The multi-stage annular rings (30) are stepped from front to back and the inner diameter gradually shrinks. The transition cavity (112) is communicated with the inside of the handle part (20).

3. The hair dryer for increasing air flow based on the negative pressure flow increasing structure according to claim 2, characterized in that, The outer side of the diversion cavity (111) and the last stage of the annular ring (30) form an arc-shaped transition at the rear end and are set as the air flow increasing inlet (14).

4. A hair dryer for increasing the air flow rate based on a negative pressure flow increasing structure according to claim 1, wherein, The distance between two adjacent stages of the annular rings (30) is 0.4 mm - 1 mm.

5. The hair dryer for increasing the air flow rate based on the negative pressure flow increasing structure according to claim 2, wherein, The transition cavity (112) is a cavity structure arranged transversely. Its cross-sectional area S12 is set to be larger than the cross-sectional area S11 of the handle part (20), and the transverse length L12 of the transition cavity (112) should be greater than 1.5 times - 2.5 times the inner diameter D11 of the handle part (20).

6. The hair dryer for increasing the air flow rate based on the negative pressure flow increasing structure according to claim 5, wherein, The cross-sectional area S21 of the air flow increasing inlet (14) is set to be smaller than the cross-sectional area S24 of the main air outlet (13).

7. A hair dryer for increasing the air flow rate based on a negative pressure flow increasing structure according to claim 1, characterized in that, The heating unit (15) is arranged between the main air outlet (13) and the annular nozzle (31), and there is a distance between the heating unit (15) and the annular nozzle (31) so that the fluid entering the mixing cavity (12) from the annular nozzle (31) and the air flow increasing inlet (14) can be fully mixed.

8. A hair dryer for increasing the air flow rate based on a negative pressure flow increasing structure according to claim 1, wherein, A connection point (33) is arranged between two adjacent stages of the annular rings (30), and two adjacent stages of the annular rings (30) are connected through the connection point (33).

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