Handheld blower

Abstract

The utility model provides a handheld blower. The handheld blower comprises a machine shell assembly, a holding handle, a blowing assembly and an air outlet pipe. The machine shell assembly comprises a first machine shell and a second machine shell which are assembled with each other, and an assembling groove is formed between the first machine shell and the second machine shell in a surrounding mode. The holding handle is connected with the machine shell assembly and is held by an operator; the air blowing assembly is at least partially assembled in the assembling groove and comprises a shell, fan blades and a motor, the shell is provided with an air inlet, the fan blades and the motor are both contained in the shell, and one end of the motor is connected with the fan blades to drive the fan blades to rotate; the air outlet pipe is connected with the machine shell assembly and provided with an air outlet, and external airflow flows into the air blowing assembly through the air inlet and flows out of the air outlet after passing through the air outlet pipe. A first airflow channel and a second airflow channel are formed in the air blowing assembly, the second airflow channel penetrates through the motor, and the first airflow channel surrounds the periphery of the second airflow channel and is close to the inner wall face of the shell. Compared with the prior art, the handheld blower has the advantages that the heat dissipation effect is improved through the arrangement of the two airflow channels.

Description

Technical Field

[0001] The utility model relates to a handheld hair dryer, belonging to the technical field of gardening tools. Background Art

[0002] As is well known, the handheld hair dryers sold and used in the market generally use 220V AC power supply. Its structure mainly consists of four parts: a motor, a fan blade, a blowing and suction air duct, and an operation handle. The motor drives the fan blade to rotate to generate wind force, so as to achieve the purpose of air supply. The handheld hair dryer is mainly used indoors, mainly for dust cleaning, and is widely used in industries such as the repair industry, industrial and mining enterprises, etc. It is simple to operate and convenient to use.

[0003] However, due to the influence of the outer diameter and stack height of the existing motor, the heat dissipation effect of the motor is poor, the power design is restricted, the wind force is small and the wind pressure is low, which cannot meet the requirements of users.

[0004] In view of this, it is necessary to improve the existing handheld hair dryer to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a handheld hair dryer, which can improve the heat dissipation effect of the motor, break through the limitation of the existing power design, and make the wind force of the handheld hair dryer meet the needs of users.

[0006] To achieve the above purpose, the utility model provides a handheld hair dryer, including:

[0007] A housing assembly, including a first housing and a second housing assembled with each other, and an assembly groove is formed between the first housing and the second housing;

[0008] A holding handle, connected to the housing assembly for an operator to hold;

[0009] A blowing assembly, at least partially assembled in the assembly groove, including a housing, a fan blade and a motor. The housing has an air inlet, the fan blade and the motor are both received in the housing, and one end of the motor is connected to the fan blade to drive the fan blade to rotate; and

[0010] An air outlet pipe, connected to the housing assembly and provided with an air outlet. External air flows into the blowing assembly from the air inlet and flows out from the air outlet after passing through the air outlet pipe;

[0011] Wherein, a first air flow channel and a second air flow channel are formed in the blowing assembly. The second air flow channel passes through the motor, and the first air flow channel surrounds the outer periphery of the second air flow channel and is close to the inner wall surface of the housing.

[0012] As a further improvement of the present utility model, the housing includes an air inlet pipe and a duct assembly connected to the air inlet pipe. The duct assembly is provided with a first passage communicating with the first air flow passage and a second passage communicating with the second air flow passage. The first passage is formed on the outer periphery of the second passage.

[0013] As a further improvement of the present utility model, the duct assembly includes an upper duct and a lower duct connected to each other. The upper duct is connected to the air inlet pipe. The lower duct is disposed near the air outlet pipe and extends toward the air outlet direction. Both the first passage and the second passage are formed on the upper duct.

[0014] As a further improvement of the present utility model, the upper duct is arranged in a conical shape that gradually contracts toward the air inlet, and the lower duct is arranged in a conical shape that gradually contracts toward the air outlet.

[0015] As a further improvement of the present utility model, the lower duct includes a lower duct housing fixedly connected to the upper duct and guide vanes received in the lower duct housing. The guide vanes are provided with fan blades spirally extending toward the air outlet direction. A flow passage is formed between two adjacent fan blades. The flow passage communicates with the first passage.

[0016] As a further improvement of the present utility model, a through hole is provided at the axis of the guide vane, and the through hole communicates with the second passage.

[0017] As a further improvement of the present utility model, a flow guiding cone is connected to the side of the guide vane facing the air outlet, and the radius of the flow guiding cone gradually decreases along the air flow direction of the second air flow passage. The flow guiding cone is provided with an opening for the air flow to flow out. The air flow flowing in the first air flow passage flows toward the air outlet along the outer peripheral surface of the flow guiding cone. The second passage, the through hole and the opening are sequentially communicated.

[0018] As a further improvement of the present utility model, the second air flow passage includes a first part and a second part. The first part is located between the wind blade and the upper duct. The second part is formed by the second passage, the guide vane and the flow guiding cone. The first part and the second part communicate at the second passage.

[0019] As a further improvement of the present utility model, the distance between the wind blade and the upper duct is greater than or equal to 2 mm.

[0020] As a further improvement of the present utility model, the air inlet is provided on the air inlet pipe. The wind blade is received in the air inlet pipe. The holding handle is disposed near the air inlet pipe.

[0021] The beneficial effects of the present utility model are as follows: By providing a duct assembly connected to the air inlet duct in the hand-held hair dryer of the present utility model, the first channel on the duct assembly can communicate with the first air flow channel in the blowing assembly, and the second channel on the duct assembly can communicate with the second air flow channel in the blowing assembly. Consequently, a part of the air flow entering the interior of the blowing assembly can pass through the motor along the second air flow channel, enhancing the heat dissipation effect of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural view of a hand-held hair dryer in accordance with a preferred embodiment of the present utility model.

[0023] Figure 2 is Figure 1 an exploded view of the hand-held hair dryer shown.

[0024] Figure 3 is Figure 1 a sectional view of the blowing assembly in

[0025] Figure 4 is Figure 2 an exploded view of the guide vane, upper duct, motor and impeller in

[0026] Figure 5 is Figure 3 the air flow direction in the first air flow channel in

[0027] Figure 6 is Figure 3 the air flow direction in the second air flow channel in

[0028] Figure 7 is Figure 4 a schematic structural view of another embodiment of the impeller.

[0029] Figure 8 is Figure 7 a schematic structural view of another angle of the impeller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Please refer to Figure 1 shown, the present utility model discloses a hand-held hair dryer 100 for hand-held use. The hand-held hair dryer 100 includes a housing assembly 5, a holding handle 6 and a blowing assembly 1. The holding handle 6 is connected to the housing assembly 5 for an operator to hold.

[0032] Please combine Figure 2 and Figure 3As shown, the housing assembly 5 includes a first housing 51 and a second housing 52 assembled with each other. After the first housing 51 and the second housing 52 are assembled, an assembly groove 50 is formed. The blowing assembly 1 is at least partially assembled in the assembly groove 50 to blow air outward.

[0033] The blowing assembly 1 includes a shell 10, a fan blade 30 and a motor 20. The shell 10 has an air inlet 111. The fan blade 30 and the motor 20 are both accommodated in the shell 10, and the fan blade 30 is located at the air inlet 111. One end of the motor 20 is connected to the fan blade 30 to drive the fan blade 30 to rotate.

[0034] In this embodiment, the air inlet 111 is exposed to the outside of the casing assembly 5 so that external air can enter the interior of the casing assembly 5 from the air inlet 111; of course, in other embodiments, the air inlet 111 can also be set inside the casing assembly 5, and it is only necessary to ensure that the air inlet 111 can connect to the external air.

[0035] The housing 10 includes an air inlet 11, and the air inlet 111 is arranged on the air inlet 11. The air inlet 11 includes an air guide 112 and an upper cover 113 connected to the air guide 112. The air inlet 111 is formed on the air guide 112. One end of the upper cover 113 is connected to the side of the air guide 112 away from the air inlet 111, and the other end is connected to the upper duct 12. The fan blade 30 is assembled inside the upper cover 113. When the fan blade 30 rotates, the external airflow enters from the air inlet 111 and flows into the upper cover 113 after passing through the air guide 112.

[0036] The air guide portion 112 is set in a cone shape that gradually shrinks toward the air outlet 141, and the upper cover 113 is set in a cone shape that gradually shrinks toward the air inlet 111, so that a first recess 115 can be formed at the connection between the air guide portion 112 and the upper cover 113; the outer diameter of the lower duct 13 close to the upper duct 12 is larger than the outer diameter close to the air outlet pipe 14, so that a second recess 116 can be formed on the outer periphery of the lower duct 13, and the first recess 115 and the second recess 116 can be inserted into by other components, thereby making the structure of the handheld hair dryer 100 more compact.

[0037] In this embodiment, the air inlet pipe 11 further includes a fixing seat 117 for fixing the air guiding portion 112. The fixing seat 117 is used to fixedly connect the air guiding portion 112 to the upper cover 113, and at the same time, it can also enhance the structural strength of the air guiding portion 112. Of course, in other embodiments, the fixing seat 117 may not be provided, and the air guiding portion 112 can be directly made of a material with higher structural strength. At this time, the air guiding portion 112 can be directly fixedly connected to the upper cover 113, and there is no limitation here.

[0038] The air inlet pipe 11 further includes a mesh cover assembly 114. The mesh cover assembly 114 is connected to one side of the air inlet 111 of the air guiding portion 112. The other end of the air guiding portion 112 is fixedly connected to the upper cover 113. The filter screen 1141 on the mesh cover assembly 114 can filter the inflowing external air flow. Preferably, in this embodiment, the mesh cover assembly 114 is assembled by a filter screen 1141 and a filter screen fixing seat 1142. The filter screen 1141 is used to filter the external air flow to make the air flow entering the blowing assembly 1 cleaner. The filter screen fixing seat 1142 is used to fix the filter screen 1141 to limit the filter screen 1141 between the filter screen fixing seat 1142 and the air guiding portion 112. Of course, in other embodiments, the filter screen 1141 and the filter screen fixing seat 1142 can also be integrally provided, as long as they can be fixed to the air guiding portion 112 and play a filtering role, and there is no limitation here.

[0039] The minimum diameter of the air inlet pipe 11 is smaller than the diameter of the air inlet 111, that is, the inner part of the inlet of the air inlet pipe 11 is recessed inward to increase the air intake volume.

[0040] Particularly, there is a first gap 101 between the outer edge of the wind blade 30 and the inner wall surface of the air inlet pipe 11, so that the minimum distance between the outer edge of the wind blade 30 and the inner wall surface of the air inlet pipe 11 is between 0.3 - 3 mm.

[0041] The handheld hair dryer 100 further includes an air outlet pipe 14 connected to the housing assembly 5. The air outlet pipe 14 is located on the side of the blowing assembly 1 away from the air inlet 111 and is provided with an air outlet 141. When the blowing assembly 1 operates, the external air flow enters the interior of the housing assembly 5 from the air inlet 111, passes through the blowing assembly 1 and the air outlet pipe 14, and then is discharged from the air outlet 141.

[0042] Please refer to Figures 3 to 6 As shown, the blowing assembly 1 has a first air flow channel 103 and a second air flow channel 104. The second air flow channel 104 passes through the motor 20, and the first air flow channel 103 surrounds the outer periphery of the second air flow channel 104 and is close to the inner wall surface of the housing 10.

[0043] The housing 10 further includes a duct assembly connected to the air inlet duct 11. The duct assembly is provided with a first passage 121 communicating with the first air flow passage 103 and a second passage 122 communicating with the second air flow passage 104. The first passage 121 is formed on the outer periphery of the second passage 122. That is to say, the blowing assembly 1 has two air flow passages, and one of the air flow passages can pass through the motor 20. Therefore, the heat dissipation effect of the motor 20 is better, and there is a larger power selection space when designing the motor 20, and the air outlet effect can also be more excellent.

[0044] Specifically, the duct assembly includes an upper duct 12 and a lower duct 13 which are connected to each other. The upper duct 12 is connected to the air inlet duct 11. The lower duct 13 is disposed near the air outlet duct 14 and extends toward the air outlet 141. The first passage 121 and the second passage 122 are both formed on the upper duct 12.

[0045] The upper duct 12 is arranged in a conical shape that gradually contracts toward the air inlet 111, and the lower duct 13 is arranged in a conical shape that gradually contracts toward the air outlet 141. With such an arrangement, it is more convenient for the upper duct 12 to be fixed to the air inlet duct 11, and the lower duct 13 can play a role in guiding the air flow; at the same time, the air flow can also be guided into an axial direction. In other words, the external air flow enters parallel along the axial direction from the air inlet 111. After the wind blade 30 rotates, the air flow flows around in all directions at a certain angle with the axial direction along the upper duct 12, and then returns to flow out parallel to the axial direction along the lower duct 13, realizing the guiding of the air flow direction.

[0046] Preferably, the ratio of the radial length of the first air flow passage 103 in the upper duct 12 to the outer diameter of the wind blade 30 is greater than 0.05, and the ratio of the diameter of the air outlet 141 to the outer diameter of the wind blade 30 is greater than 0.15, which is not only beneficial to air intake, but also can ensure stable air speed.

[0047] The lower duct 13 includes a lower duct housing 130 fixedly connected to the upper duct 12 and a guide vane 131 received in the lower duct housing 130. The guide vane 131 is provided with fan blades 132 spirally extending toward the air outlet 141. A flow passage is formed between two adjacent fan blades 132, and the flow passage is communicated with the first passage 121. That is to say, the air flow flowing into the first air flow passage 103 enters the lower duct 13 along the first passage 121 and flows along the flow passage between two adjacent fan blades 132 on the guide vane 131, thereby realizing the guiding function of the lower duct 13.

[0048] In this embodiment, a through hole 133 is provided at the axis of the guide vane 131, and the through hole 133 communicates with the second channel 122. Therefore, after the air flow flowing into the second air flow channel 104 enters the lower duct 13 along the second channel 122, it can flow through the through hole 133. In this way, the two air flow paths of the hand-held hair dryer 100 are completely divided.

[0049] A flow guiding cone 22 is connected to the side of the guide vane 131 facing the air outlet 141, and the radius of the flow guiding cone 22 gradually decreases along the air flow direction of the second air flow channel 104. The flow guiding cone 22 is provided with an opening 221 for the air flow to flow out. The air flow flowing in the first air flow channel 103 flows towards the air outlet 141 along the outer peripheral surface of the flow guiding cone 22. The second channel 122, the through hole 133 and the opening 221 are sequentially communicated. The first air flow channel 103 and the second air flow channel 104 communicate at the opening 221.

[0050] The second air flow channel 104 includes a first part and a second part. The first part is located between the impeller 30 and the upper duct 12, and the second part is formed by the second channel 122, the guide vane 131 and the flow guiding cone 22. The first part and the second part communicate at the second channel 122.

[0051] Specifically, a second gap 102 is left between the upper duct 12 and the impeller 30, so that the distance between the impeller 30 and the upper duct 12 is greater than or equal to 2 mm, and the first part is formed in the second gap 102. A part of the external air flow flowing into the air inlet pipe 11 enters the first air flow channel 103 from the first channel 121, and another part enters the second channel 122 from the second gap 102 and circulates in the second air flow channel 104 through the second channel 122. Of course, in other embodiments, the first channel 121 and the second channel 122 can also be separated by setting a connecting member, and no limitation is made thereto.

[0052] The impeller 30 is a mixed-flow impeller. The impeller 30 includes a base 31 and blades 32 spirally extending from the center of the base 31. The blades 32 are preferably provided with 6 pieces. A pivot hole 35 is provided at the axis of the base 31, and the motor 20 passes through the pivot hole 35 to drive the base 31 to rotate.

[0053] Preferably, the blade 32 has a first side 321, a second side 322 and a third side 323 connected to the base 31. The blade 32 extends towards the air inlet 111, that is, both the first side 321 and the second side 322 extend towards the air inlet 111. The first side 321 is erected on the base 31 and is arranged close to the axis of the base 31. The second side 322 is also erected on the base 31 and is arranged away from the axis of the base 31. The two ends of the third side 323 are respectively connected to the first side 321 and the second side 322. The included angle between the extending direction of the first side 321 and the axial direction of the base 31 is less than or equal to 80°, so that an inwardly concave space is formed at the air inlet 111, which is beneficial to increasing the air intake. The included angle between the extending direction of the third side 323 and the axial direction of the base 31 is less than 90°, so as to guide the air flow into the air outlet pipe 14 under the action of the housing 10 and the lower duct 13.

[0054] Please refer to Figure 7 and Figure 8 As shown, in another embodiment of the present invention, the base 31 is further provided with air passing holes 33 located between two adjacent blades 32. That is, there are also 6 air passing holes 33 and they are arranged close to the axis of the wind blade 30. The opening direction of the air passing holes 33 is parallel to the axial direction of the wind blade 30, and is used to communicate the air inlet 111 and the second channel 122.

[0055] That is to say, in this embodiment, the second air flow channel 104 is formed by the air passing holes 33, the second channel 122, the through hole 133 and the guide cone 22. The extending direction of the second air flow channel 104 is parallel to the axial direction of the wind blade 30. Thus, part of the air flow flowing into the air inlet pipe 11 enters the flow channel formed on the outer peripheral wall of the guide vane 131 through the first channel 121, and part of it flows in through the air passing holes 33, enters the guide vane 131 and the guide cone 22 through the second channel 122, and finally flows towards the air outlet 141.

[0056] The wind blade 30 further includes an extension edge 34 extending towards the upper duct 12. The extension edge 34 surrounds the base 31, and the extension edge 34 extends away from the blade 32. The orthographic projection of the extension edge 34 on the upper duct 12 partially overlaps with the upper duct 12, so that the extension edge 34 extends into the upper duct 12 and is connected to the stop of the upper duct 12. Since the upper duct 12 is fixed and does not rotate, the wind blade 30 can rotate relative to the upper duct 12. Therefore, the extension edge 34 can be used to prevent the air flow from flowing into the second air flow channel 104 along the gap between the wind blade 30 and the upper duct 12.

[0057] In this embodiment, the handheld hair dryer 100 further includes a plurality of switches for controlling the wind speed, start / stop, etc. of the handheld hair dryer 100.

[0058] As Figure 1 and Figure 2 shown, the grip handle 6 includes a grip 61 and a plurality of switches integrated on the grip 61, and the setting positions of these switches on the grip 61 are all different.

[0059] Specifically, a first switch 611 is provided at the top of the grip 61, and the first switch 611 is used to control the air outlet speed; a second switch 612 is provided on the side wall of the grip 61, and the second switch 612 is used to control the constant-speed air outlet of the handheld hair dryer 100; a third switch 613 is further provided at the bottom of the grip 61, and the third switch 613 is used to control the start / stop of the handheld hair dryer 100. The first switch 611, the second switch 612, and the third switch 613 are independent of each other, and in other embodiments, the setting positions and functions can also be adjusted according to actual needs, and no limitation is imposed thereon.

[0060] A fourth switch 614 is further provided on the air outlet pipe 14, and the fourth switch 614 is used to fix the air outlet pipe 14 so that it is detachably connected to the housing assembly 5. When the fourth switch 614 is pressed, the air outlet pipe 14 can be detached from the housing assembly 5.

[0061] In summary, the handheld hair dryer 100 of the present invention adopts a mixed-flow impeller. The external air flow enters parallel along the axial direction from the air inlet 111. After the impeller 30 rotates, the air flow flows around in a certain angle with the axial direction along the upper duct 12, and then returns to flow out parallel to the axial direction along the lower duct 13, realizing the guiding of the air flow direction. That is, the mixed-flow impeller 30 of the present invention enables the flowing air flow to have both an axial component and a radial component. By providing a duct assembly connected to the air inlet pipe 11, the first channel 121 on the duct assembly can be communicated with the first air flow channel 103 in the blowing assembly 1, and the second channel 122 on the duct assembly can be communicated with the second air flow channel 104 in the blowing assembly 1, so that a part of the air flow entering the inside of the blowing assembly 1 can pass through the motor 20 along the second air flow channel 104, improving the heat dissipation effect of the motor 20.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A handheld hair dryer, characterized in that: include: The housing assembly comprises a first housing and a second housing assembled with each other, wherein an assembly groove is formed between the first housing and the second housing; A gripping handle connected to the housing assembly for an operator to grip; The blowing assembly is at least partially assembled in the assembly groove, and comprises a shell, a fan blade and a motor, wherein the shell has an air inlet, the fan blade and the motor are both accommodated in the shell, and one end of the motor is connected to the fan blade to drive the fan blade to rotate; and An air outlet pipe is connected to the housing assembly and is provided with an air outlet, and external air flows into the blowing assembly from the air inlet and flows out from the air outlet after passing through the air outlet pipe; The blowing assembly has a first airflow channel and a second airflow channel, the second airflow channel passes through the motor, and the first airflow channel surrounds the outer periphery of the second airflow channel and is close to the inner wall surface of the shell.

2. The handheld hair dryer according to claim 1, characterized in that: The shell includes an air inlet pipe and a duct assembly connected to the air inlet pipe. The duct assembly is provided with a first channel connected to the first air flow channel and a second channel connected to the second air flow channel. The first channel is formed on the periphery of the second channel.

3. The handheld hair dryer according to claim 2, characterized in that: The duct assembly includes an upper duct and a lower duct connected to each other, the upper duct is connected to the air inlet pipe, the lower duct is arranged close to the air outlet pipe and extends toward the air outlet, and the first channel and the second channel are both formed on the upper duct.

4. The handheld hair dryer according to claim 3, characterized in that: The upper duct is arranged in a conical shape that gradually contracts toward the air inlet, and the lower duct is arranged in a conical shape that gradually contracts toward the air outlet.

5. The handheld hair dryer according to claim 3, characterized in that: The lower duct includes a lower duct shell fixedly connected to the upper duct and a guide vane accommodated in the lower duct shell, the guide vane is provided with a blade spirally extending toward the air outlet, a flow channel is formed between two adjacent blades, and the flow channel is connected to the first channel.

6. The handheld hair dryer according to claim 5, characterized in that: A through hole is provided at the axis of the guide vane, and the through hole is connected to the second channel.

7. The handheld hair dryer according to claim 6, characterized in that: A guide cone is connected to the side of the guide vane facing the air outlet, and the radius of the guide cone gradually decreases along the airflow direction of the second airflow channel. The guide cone is provided with an opening for airflow to flow out. The airflow flowing in the first airflow channel flows along the outer peripheral surface of the guide cone toward the air outlet, and the second channel, the through hole and the opening are connected in sequence.

8. The handheld hair dryer according to claim 7, characterized in that: The second airflow channel includes a first part and a second part, the first part is located between the fan blade and the upper duct, the second part is formed by the second channel, the guide vane and the guide cone, and the first part and the second part are connected at the second channel.

9. The handheld hair dryer according to claim 8, characterized in that: The distance between the fan blade and the upper duct is greater than or equal to 2 mm.

10. The handheld hair dryer according to claim 2, characterized in that: The air inlet is arranged on the air inlet pipe, the fan blades are accommodated in the air inlet pipe, and the holding handle is arranged close to the air inlet pipe.

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