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

Abstract

The utility model 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] This utility model relates to the field of hair dryer technology, and in particular to a hair dryer that increases airflow based on a negative pressure boosting structure. Background Technology

[0002] In the field of personal care appliances, hair dryers, as commonly used hair styling tools, have always attracted much attention for their technological development. As consumers' demands for hair dryer performance continue to increase, hair dryer designs are also constantly being innovated.

[0003] In existing hair dryers, a hollow structure is typically used inside the nozzle to increase airflow. This utilizes the increased airflow velocity as the air exits, drawing a small amount of air towards the outlet. However, current airflow-multiplying hair dryers still have significant shortcomings in practical applications. Firstly, only a small amount of air is drawn into the hair dryer besides the motor drive, meaning the increased airflow from the multiplier structure is minimal. Secondly, the heating of the additional airflow is not considered, resulting in a decrease in the temperature of the air blown out, thus reducing the drying effect. Although the airflow is increased slightly, the overall temperature of the airflow at the outlet is also lower, which is not effective in improving the drying efficiency. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] A hair dryer that increases airflow based on a negative pressure boosting structure includes a blower section and a handle section connected to the blower section. The blower section has an annular cavity, a mixing cavity, and a multi-stage annular ring. 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 boosting air inlet. The lower end of the handle section is provided with a main air inlet, and the upper end of the handle section is connected to the annular cavity, so that a longitudinal fluid channel from the main air inlet to the annular cavity is formed inside the handle section. A pressurization unit is provided in the longitudinal fluid channel, and a heating unit is provided in the middle section of the mixing cavity.

[0006] Multi-level annular rings are set between the annular cavity and the mixing cavity. An annular nozzle is formed between two adjacent annular rings, which connects the annular cavity and the mixing cavity. The annular nozzle faces the main air outlet. Each annular ring in front of each annular nozzle has an arc-shaped protrusion extending inside the annular cavity, so that the annular nozzle forms an arc-shaped transition structure from the annular cavity to the mixing cavity.

[0007] The main air inlet, longitudinal fluid channel, heating unit, annular cavity and annular nozzle form a negative pressure boosting structure to generate boosted airflow in the mixing chamber that enters along the boosting air inlet and flows out through the main air outlet.

[0008] Preferably, the annular cavity has a guide cavity with a gradually narrowing outer side and a transition cavity connected to the guide cavity. The outer side of the guide cavity forms an angle of 30°-45° with the horizontal direction. The inner side of the guide cavity is composed 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 interior of the handle.

[0009] Preferably, the outer side of the guide cavity and the last annular ring form an arc transition at the rear end and are configured as a flow-enhancing air inlet.

[0010] Preferably, the spacing between two adjacent annular rings is 0.4mm-1mm.

[0011] Preferably, the transition cavity is a transversely arranged cavity structure, and its cross-sectional area S12 is set to be larger than the cross-sectional area S11 of the handle part, and the transverse 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.

[0012] Preferably, the cross-sectional area S21 of the booster air inlet is set to be smaller than the cross-sectional area S24 of the main air outlet.

[0013] Preferably, the heating unit is disposed 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 chamber through the annular nozzle and the booster air inlet can be fully mixed.

[0014] Preferably, a connection point is provided between two adjacent annular rings, and the two adjacent annular rings are connected through the connection point.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By forming multiple levels of annular rings between the annular cavity and the mixing cavity, and forming annular nozzles facing the main air outlet between adjacent levels of annular rings, and each annular ring in front of each annular nozzle having an arc-shaped protrusion extending inward along the annular cavity, the annular nozzle forms an arc-shaped transition structure from the annular cavity to the mixing cavity. This cleverly utilizes the Coanda effect to optimize the negative pressure boosting structure, allowing fluid to flow more efficiently from the annular cavity to the mixing cavity, and then through the annular nozzles, a high-speed airflow forms negative pressure. This better attracts surrounding air from the boosting air inlet to form a boosting airflow that moves 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 enhancing the airflow multiplication effect. Compared to traditional hair dryers, it can drastically shorten drying time, saving users valuable energy.

[0017] In addition, the heating unit heats all the air entering the mixing chamber, ensuring that even the extra air intake reaches a suitable temperature, avoiding a drop in air temperature due to increased air volume, thus guaranteeing the hair drying effect, improving user comfort and hair styling efficiency, and achieving a double breakthrough in both performance and practicality of the hair dryer.

[0018] A heating unit is installed 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 before being blown out from the main air outlet, thereby improving the drying effect.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of the present invention from one perspective;

[0022] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of this utility model;

[0024] Figure 4 This is a utility model Figure 3 Schematic diagram of the structure at point A;

[0025] Figure 5 This is a utility model Figure 3 Schematic diagram of the structure at point B;

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the ventilation duct section in this utility model;

[0027] Figure 7 This utility model is an airflow diagram generated solely by the rotation of a high-speed motor;

[0028] Figure 8 This utility model is an airflow diagram generated by Bernoulli's principle and the Coanda effect;

[0029] Figure 9 This is the overall airflow diagram generated during the operation of this utility model.

[0030] The reference numerals and names in the figure are as follows:

[0031] 10. Air duct section, 11. Annular cavity, 111. Flow guide cavity, 112. Transition cavity, 12. Mixing cavity, 13. Main air outlet, 14. Flow booster air inlet, 15. Heating unit, 20. Handle section, 21. Main air inlet, 22. Pressure booster unit, 30. Annular ring, 31. Annular nozzle, 32. Arc-shaped protrusion, 33. Connection point. Detailed Implementation

[0032] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Please see Figure 1-6 In this embodiment of the present invention, a hair dryer that increases airflow based on a negative pressure boosting structure includes a blower section 10 and a handle section 20 connected to the blower section 10. The blower section 10 has an annular cavity 11 and a mixing cavity 12. The front end of the mixing cavity 12 is provided with a main air outlet 13, and the rear end of the mixing cavity 12 is provided with a boosting air inlet 14. The lower end of the handle section 20 is provided with a main air inlet 21, and the upper end of the handle section 20 is connected to 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 section 20. A pressurization unit 22 is provided in the longitudinal fluid channel, and a heating unit 15 is provided in the middle section of the mixing cavity 12.

[0034] A multi-stage annular ring 30 is formed between the annular cavity 11 and the mixing cavity 12. An annular nozzle 31 facing the main air outlet 13 is formed between two adjacent annular rings 30. Each annular ring 30 in front of each annular nozzle 31 is formed with an arc-shaped protrusion 32 extending inside the annular cavity 11, so that the final annular nozzle 31 forms an arc-shaped transition structure between the annular cavity 11 and the mixing cavity 12.

[0035] The main air inlet 21, longitudinal fluid channel, pressurization unit 22, annular cavity 11 and annular nozzle 31 form a negative pressure boosting structure to generate boosted airflow in the mixing cavity 12 that enters along the boosting air inlet 14 and then flows out through the main air outlet 13.

[0036] When the blower is started, the booster unit 22 operates within the longitudinal fluid channel of the handle 20, drawing air in from the main air inlet 21 at the lower end of the handle 20 and into the annular cavity 11 along the longitudinal fluid channel. Between the annular cavity 11 and the mixing cavity 12, a special flow guiding structure is formed by multi-stage annular rings 30 and arc-shaped protrusions 32. Air is ejected at high speed through the annular nozzles 31 between adjacent annular rings 30, forming a high-speed transverse airflow. Due to the high-speed ejection of the airflow, a negative pressure area is formed within the mixing cavity 12, creating a pressure difference with the external environment at the booster air inlet 14. Under the action of this pressure difference, external air is rapidly drawn in through the booster air inlet 14 at the rear end of the mixing cavity 12. The inhaled airflow mixes with the airflow ejected from the annular nozzles 31 within the mixing cavity 12, and is then heated by the heating unit 15 located in the middle section of the mixing cavity 12 before finally being blown out from the main air outlet 13 at the front end of the mixing cavity 12, achieving efficient blowing.

[0037] In the above technical solution, the design of the negative pressure boosting structure utilizes Bernoulli's principle and the Coanda effect, using a high-speed motor as the power source for the hair dryer, namely the boosting unit 22. The airflow generated solely by the rotation of the high-speed motor is as follows: Figure 7 As shown; the airflow attracted by the negative pressure boosting structure is as follows Figure 8 As shown; driven by a high-speed motor and the flow channel design of this scheme, the airflow generated by the high-speed motor mainly blows out along the inner wall. The high-speed airflow is ejected through the annular nozzle 31, creating a negative pressure in the mixing chamber 12. The negative pressure attracts external air through the booster air inlet 14, forming an airflow. The two airflows mix in the mixing chamber 12 and are finally blown out from the main air outlet 13. The mixed airflow is as follows: Figure 9 As shown;

[0038] By forming a multi-stage annular ring 30 between the annular cavity 11 and the mixing cavity 12, and forming an annular nozzle 31 facing the main air outlet 13 between adjacent annular rings 30, and forming an arc-shaped protrusion 32 extending inside the annular cavity 11 on each annular ring 30 in front of each annular nozzle 31, the final annular nozzle 31 forms an arc-shaped transition structure between the annular cavity 11 and the mixing cavity 12. The Coanda effect is cleverly utilized to optimize the negative pressure boosting structure, allowing the fluid to flow more smoothly from the annular cavity 11 to the mixing cavity 12. Based on the negative pressure formed by the high-speed airflow formed by the annular nozzle, the surrounding air can be better driven to enter from the boosting air inlet to form a boosting airflow and move forward. This not only improves the overall performance of the hair dryer, but also greatly improves the user experience and significantly increases the airflow entering the fan. Compared with traditional hair dryers, it can greatly shorten the drying time and save users valuable energy.

[0039] In addition, the heating unit 15 heats all the air entering the mixing chamber 12, ensuring that the additional air intake can also reach a suitable temperature, avoiding the decrease in air temperature due to the increase in air volume, ensuring the effect of drying hair, improving the user's comfort and hair styling efficiency, and enabling the hair dryer to achieve a double breakthrough in performance and practicality.

[0040] Please see Figure 3-5 The annular cavity 11 has a gradually narrowing guide cavity 111 and a transition cavity 112 connected to the guide cavity 111. The outer side of the guide cavity 111 forms an angle of 30°-45° with the horizontal direction. The inner side of the guide cavity 111 is composed of multiple annular rings 30. The multiple annular rings 30 are stepped from front to back and their inner diameter gradually decreases. The transition cavity 112 is connected to the interior of the handle part 20, which can effectively guide the airflow acceleration, so that more air is drawn in from the booster air inlet 14. The outer and inner sides of the guide cavity 111 form an arc transition at the rear end and are set as the booster air inlet 14, which reduces the airflow resistance and reduces energy loss. The spacing between two adjacent annular rings 30 is 0.4mm-1mm to ensure that the airflow is ejected at high speed and forms negative pressure. The transition cavity 112 is a transversely arranged cavity structure. In order to avoid the increase of air resistance, its cross-sectional area S 12 The cross-sectional area S is set to be larger than that of the handle portion 20. 11 And the lateral length L of the transition cavity 112 12 It should be larger than the inner diameter D of the handle by 20. 11 The cross-sectional area S21 of the booster air inlet 14 is set to be smaller than that of the main air outlet 13, which avoids increasing air resistance and ensures that the air flows smoothly into the annular cavity 11. The cross-sectional area S21 of the booster air inlet 14 is set to be smaller than that of the main air outlet 13, which avoids increasing resistance and promotes the airflow to move forward quickly to achieve efficient air outlet.

[0041] When using the hair dryer, the booster unit 22 starts working, driving gas from the main air inlet 21 into the handle section 20 to form an airflow. The airflow then enters the transition chamber 112 from the handle section 20. To avoid increasing air resistance, the cross-sectional area S of the transition chamber 112 is... 12 It should be greater than the cross-sectional area S of the handle portion 20. 11 However, it should not be much larger than the cross-sectional area of ​​the handle portion 20. times, that is After passing through the flow chamber 112, the air enters the guide chamber (111) and is blown into the mixing chamber 12 through the annular nozzle 31. The negative pressure boosting structure is the core component of this blower. The negative pressure generating structure includes the guide chamber 111, a multi-stage annular ring 30, and the annular nozzle 31. The guide chamber 111 is a gradually narrowing cavity, derived from the continuity equation and Bernoulli's equation. Its purpose is that as the airflow enters, its cross-sectional area gradually decreases, causing its velocity to gradually increase and its pressure to gradually decrease. The continuity equation is: Bernoulli's equation is: According to aerodynamic principles, the pressure variable is relatively small at this time, therefore the corresponding ,at this time The density of air at room temperature and pressure is therefore...

[0042] The continuity equation simplifies to: ;

[0043] Bernoulli's equation simplifies to: ;

[0044] When area When decreasing, according to the continuity equation, we can obtain It will increase; according to Bernoulli's equation, the pressure will increase at this point. It will decrease.

[0045] Therefore, after passing through the negative pressure boosting structure, the airflow is accelerated to form a high-speed airflow, which is then ejected from the annular nozzle 31. At this point, the speed reaches its maximum, and a negative pressure is formed in the subsequent mixing chamber 12. When the airflow enters the annular nozzle 31 from the guide chamber 111, it passes through the arc-shaped protrusion 32. According to the Coanda effect, the airflow will flow along the curved surface due to the viscosity of the gas, thus avoiding flow separation when the airflow enters the annular nozzle 31 from the guide chamber 111 and reducing energy loss.

[0046] As mentioned earlier, the high-speed airflow exiting the annular nozzle 31 creates a negative pressure in the mixing chamber 12, while the pressure multiplier inlet 14 is in an atmospheric environment with a pressure of 1 atm, and the pressure gauge displays a relative pressure of 0 Pa. Therefore, a pressure difference exists between the mixing chamber 12 and the pressure multiplier inlet 14. According to Bernoulli's equation, ...

[0047]

[0048] in, Energy loss due to viscous forces, etc. The increased flow rate can be estimated using CFD technology based on data from the booster unit and other sources.

[0049] Finally, the airflow driven by the fan 22 and the airflow attracted by the negative pressure boosting structure are mixed together in the mixing chamber 12 and enter the heating unit 15. The heating unit 15 heats the airflow to a certain temperature and blows it out from the air outlet to act on the hair.

[0050] Please see Figure 3 and Figure 6The heating unit 15 is located between the main air outlet 13 and the booster air inlet 14, which enables the air to be heated immediately after entering the mixing chamber 12, reducing heat loss during transmission and ensuring stable and efficient air temperature. A connection point 33 is provided between adjacent annular rings 30, which connects the adjacent annular rings 30, enhancing the overall structural stability of the annular cavity 11 and preventing the annular rings 30 from loosening or deforming due to vibration caused by high-speed airflow. This ensures that the airflow can be ejected stably and smoothly from the first annular air outlet, continuously forming negative pressure and improving air intake and blowing efficiency. This connection method also reduces manufacturing and assembly difficulty, facilitates later maintenance and repair, and further enhances the overall advantages of the hair dryer in terms of performance assurance and ease of use.

[0051] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A hair dryer for increasing air flow based on a negative pressure flow increasing structure, characterized in that, The device includes a blower section (10) and a handle section (20) connected to the blower section (10). The blower section (10) has an annular cavity (11), a mixing cavity (12) and a multi-stage annular ring (30). The mixing cavity (12) has a main air outlet (13) at its front end and a booster air inlet (14) at its rear end. The handle section (20) has a main air inlet (21) at its lower end and a handle section (20) connected to the annular cavity (11) at its upper end, so that a longitudinal fluid channel from the main air inlet (21) to the annular cavity (11) is formed inside the handle section (20). A pressurization unit (22) is provided in the longitudinal fluid channel, and a heating unit (15) is provided in the middle section of the mixing cavity (12). A multi-level annular ring (30) is disposed between the annular cavity (11) and the mixing cavity (12). An annular nozzle (31) is formed between two adjacent annular rings (30) that connects the annular cavity (11) and the mixing cavity (12). The annular nozzle (31) faces the main air outlet (13). Each annular ring (30) in front of each annular nozzle (31) is formed with an arc-shaped protrusion (32) extending inside the annular cavity (11), so that the annular nozzle (31) forms an arc-shaped transition structure from the annular cavity (11) to the mixing cavity (12). The main air inlet (21), longitudinal fluid channel, pressurization unit (22), annular cavity (11) and annular nozzle (31) form a negative pressure boosting structure to generate a boosted airflow in the mixing cavity (12) that enters along the boosted air inlet (14) and flows out through the main air outlet (13).

2. A hair dryer based on the negative pressure flow increasing structure to increase the airflow flow rate according to claim 1, characterized in that, The annular cavity (11) has a guide cavity (111) with a gradually narrowing outer side and a transition cavity (112) connected to the guide cavity (111). The outer side of the guide cavity (111) forms an angle of 30°-45° with the horizontal direction. The inner side of the guide cavity (111) is composed of multi-level annular rings (30). The multi-level annular rings (30) are stepped from front to back and the inner diameter gradually decreases. The transition cavity (112) is connected to the interior of the handle part (20).

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

4. A hair dryer for increasing airflow based on a negative pressure boosting structure according to claim 1, characterized in that, The spacing between two adjacent annular rings (30) is 0.4mm-1mm.

5. A hair dryer for increasing airflow based on a negative pressure boosting structure according to claim 2, characterized in that, The transition cavity (112) is a transversely arranged cavity structure. 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 1.5 to 2.5 times greater than the inner diameter D11 of the handle part (20).

6. A hair dryer for increasing airflow based on a negative pressure boosting structure according to claim 5, characterized in that, The cross-sectional area S21 of the booster air 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 airflow based on a negative pressure boosting structure according to claim 1, characterized in that, The heating unit (15) is located 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 chamber (12) through the annular nozzle (31) and the booster air inlet (14) can be fully mixed.

8. A hair dryer for increasing airflow based on a negative pressure boosting structure according to claim 1, characterized in that, A connection point (33) is provided between two adjacent rings (30), and the two adjacent rings (30) are connected through the connection point (33).

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