Waist hanging fan

Abstract

A waist-hanging fan relates to the field of fans. The waist hanging fan comprises a shell, a volute house, a volute, an airflow channel and a cross-flow fan unit. The shell is provided with an air inlet and an air outlet, an air flow channel is formed between the air inlet and the air outlet, the air flow channel is jointly formed by the shell, the volute tongue and the volute, and the cross-flow fan unit is arranged in the air flow channel. Based on the arrangement of the cross-flow fan unit, a sixth flow limiting part forming an airflow channel extends towards the cross-flow fan unit, so that the air inlet pressure is increased, meanwhile, the air speed is increased, and in the first direction, the distance from the part, from the sixth flow limiting part to the air outlet, of the volute to the center of the cross-flow fan unit is gradually increased, so that the air speed is further increased; and through the arrangement that the third flow limiting part extends towards the cross-flow fan unit, the airflow is prevented from entering airflow circulation of the cross-flow fan unit again, and the air outlet amount is further increased.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically to a waist-mounted fan. Background Technology

[0002] When exercising or doing strenuous physical labor, people often experience discomfort due to excessive sweating, causing their clothes to stick to their bodies. Traditional standing fans are not portable, and handheld fans require the user to hold them, which takes up one hand and makes it inconvenient to perform other actions. Furthermore, traditional fans blow air from the outside in, which cannot quickly evaporate the sweat between the clothes and the body.

[0003] Therefore, waist-mounted fans were developed. These fans are clipped to trousers or a belt, with the air outlet directed at the gap between the clothing and the body. This allows airflow to escape from bottom to top between the clothing and the body. Because of this airflow, sweat evaporates faster, preventing clothes from sticking to the body. Traditional waist-mounted fans use axial or centrifugal fans, resulting in a larger overall size and lower airflow, leading to slower sweat evaporation and a longer waiting time for the user to cool down, resulting in a poor user experience. Utility Model Content

[0004] The purpose of this utility model is to address the defects and deficiencies of the existing technology by providing a waist-mounted fan that employs a cross-flow fan unit. The sixth flow-limiting part, which forms the airflow channel, extends towards the cross-flow fan unit, thereby increasing the inlet air pressure and the air velocity. Furthermore, in the first direction, the distance from the part of the volute from the sixth flow-limiting part to the air outlet to the center of the cross-flow fan unit gradually increases, further increasing the air velocity. The third flow-limiting part extends towards the cross-flow fan unit to prevent the airflow from re-entering the airflow circulation of the cross-flow fan unit, further increasing the air volume.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a waist-mounted fan, comprising: a housing with an air inlet and an air outlet, the air outlet being located at one end of the housing in a first direction; a volute tongue disposed within the housing, one end of the volute tongue being connected to the air outlet; a volute shell disposed within the housing, one end of the volute shell being connected to the air inlet, and the other end of the volute shell being connected to the air outlet; an airflow channel disposed between the air inlet and the air outlet, formed by the housing, the volute tongue, and the volute shell; and a cross-flow fan unit. The cross-flow fan unit is disposed within the airflow channel, with its opposite ends connected to the housing. The volute tongue and the volute casing are located on opposite sides of the cross-flow fan unit and are spaced apart from it. The volute tongue includes a third flow-limiting portion that extends toward the cross-flow fan unit, and the volute casing includes a sixth flow-limiting portion that extends toward the cross-flow fan unit. In the first direction, the distance from the sixth flow-limiting portion to the air outlet of the volute casing to the center of the cross-flow fan unit gradually increases.

[0006] Preferably, the volute tongue includes a first flow-limiting part and a second flow-limiting part. The first flow-limiting part is disposed at the air inlet and extends towards the cross-flow fan unit. The second flow-limiting part is disposed at the air outlet and extends towards the cross-flow fan unit. The end of the first flow-limiting part away from the air inlet is connected to the end of the second flow-limiting part away from the air outlet. The third flow-limiting part is located at the connection between the first flow-limiting part and the second flow-limiting part. The volute includes a fourth flow-limiting part and a fifth flow-limiting part. The fourth flow-limiting part is disposed at the air inlet and extends towards the cross-flow fan unit. The fifth flow-limiting part is disposed at the air outlet and extends towards the cross-flow fan unit. The end of the fourth flow-limiting part away from the air inlet is connected to the end of the fifth flow-limiting part away from the air outlet. The sixth flow-limiting part is located at the connection between the fourth flow-limiting part and the fifth flow-limiting part. In the extending direction of the second flow-limiting part, the second flow-limiting part extends at least partially in the direction from the second flow-limiting part to the fifth flow-limiting part.

[0007] Preferably, the housing includes a first main body, a first inner shell, and a second inner shell. The first inner shell and the second inner shell are respectively disposed on opposite ends of the first main body. The first main body has a hollow structure and is provided with the air inlet and the air outlet. The volute tongue and the volute shell are disposed inside the first main body. The first main body, the volute tongue, the volute shell, the first inner shell, and the second inner shell together form the airflow channel. The cross-flow fan unit is disposed in the airflow channel, and the opposite ends of the cross-flow fan unit are respectively connected to the first inner shell and the second inner shell.

[0008] Preferably, at least one air outlet grille is provided at the air outlet, the air outlet grille is disposed between the volute tongue and the volute shell, and is spaced apart from the volute tongue and the volute shell, the air outlet grille includes a first air guide portion and a second air guide portion, the second air guide portion is close to the cross-flow fan unit, the second air guide portion extends at least partially toward the cross-flow fan unit, and the second air guide portion extends at least partially toward the volute shell, the first air guide portion extends at least partially in a direction away from the cross-flow fan unit, and the first air guide portion extends at least partially in the first direction.

[0009] Preferably, the waist-mounted fan further includes a back clip, which is disposed on the housing, on the side adjacent to the air outlet and away from the air inlet, and extends along the first direction. The housing has a first connecting portion, and the back clip has a third connecting portion, with the first connecting portion connected to the third connecting portion. In a first clamping state, the end of the back clip away from the first connecting portion is in contact with the housing; in a first unfolded state, the end of the back clip away from the first connecting portion is spaced apart from the housing. Alternatively, in the first clamping state, the end of the back clip away from the first connecting portion maintains a first minimum distance from the housing; in the first unfolded state, the distance between the end of the back clip away from the first connecting portion and the housing is greater than the first minimum distance.

[0010] Preferably, the waist-mounted fan further includes a bracket, which is disposed on the side of the back clip facing away from the housing. The bracket extends along the first direction and includes a fourth connecting portion close to the third connecting portion, which is hinged to the back clip. In the retracted state, the end of the bracket away from the third connecting portion is in contact with the back clip. In the supported state, the end of the bracket away from the third connecting portion is spaced apart from the back clip. Alternatively, in the retracted state, the end of the bracket away from the third connecting portion maintains a second minimum interval distance from the back clip. In the supported state, the distance between the end of the bracket away from the third connecting portion and the back clip is greater than the second minimum interval.

[0011] Preferably, the waist-hanging fan further includes a hem clip, the hem clip comprising: a fifth connecting portion, a second connecting portion being provided on the side of the housing opposite to the back clip, the fifth connecting portion being connected to the second connecting portion; a first clamping plate, the first clamping plate being disposed at the end of the fifth connecting portion away from the second connecting portion, the first clamping plate extending at least partially in the opposite direction to the first direction; a second clamping plate, the second clamping plate being disposed on the side of the first clamping plate opposite to the fifth connecting portion; a bending portion, one end of the bending portion being connected to the end of the first clamping plate in the opposite direction to the first direction, and the other end of the bending portion being connected to the end of the second clamping plate in the opposite direction to the first direction; wherein, in the second clamping state, the second clamping plate and the first clamping plate are spaced apart, the spacing between the second clamping plate and the first clamping plate being a third minimum spacing; in the second unfolded state, the spacing between the end of the second clamping plate away from the bending portion and the first clamping plate is greater than the third minimum spacing; or, in the second clamping state, the second clamping plate is in contact with the first clamping plate; in the second unfolded state, the end of the second clamping plate away from the bending portion is spaced apart from the first clamping plate.

[0012] Preferably, the hem clip is disposed on the side of the air inlet facing away from the cross-flow fan unit and is spaced apart from the air inlet, and the size of the air inlet in the first direction is larger than the size of the hem clip in the first direction.

[0013] Preferably, the waist-mounted fan further includes a lighting unit, a circuit board, and a power supply unit. The lighting unit, the circuit board, and the power supply unit are all housed within the housing. The lighting unit is electrically connected to the circuit board, the lighting unit is electrically connected to the power supply unit, and the circuit board is electrically connected to the power supply unit. The housing has a lighting clearance structure to expose at least a portion of the lighting unit.

[0014] Preferably, the waist-mounted fan further includes a display unit, a circuit board, and a power supply unit. The display unit, the circuit board, and the power supply unit are all housed within the housing. The display unit is electrically connected to the circuit board, the display unit is electrically connected to the power supply unit, and the circuit board is electrically connected to the power supply unit. The housing has a display clearance structure for the display unit to display information.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are as follows: Based on the setting of the cross-flow fan unit, the sixth flow limiting part that forms the airflow channel is extended to the cross-flow fan unit, thereby increasing the inlet air pressure and the air velocity. In the first direction, the distance from the part of the volute from the sixth flow limiting part to the air outlet to the center of the cross-flow fan unit gradually increases, which further increases the air velocity. By extending the third flow limiting part to the cross-flow fan unit, the airflow is prevented from re-entering the airflow circulation of the cross-flow fan unit, further increasing the air volume. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of the waist-mounted fan in an embodiment of this utility model.

[0018] Figure 2 This is an exploded schematic diagram of the waist-mounted fan in an embodiment of this utility model.

[0019] Figure 3 This is an exploded view of the waist-mounted fan from another perspective in an embodiment of this utility model.

[0020] Figure 4 This is an exploded view of the cross-flow fan unit in an embodiment of this utility model.

[0021] Figure 5 This is an exploded view of the cross-flow fan unit from another perspective in an embodiment of this utility model.

[0022] Figure 6 yes Figure 1 Cross-sectional view along the AA' direction.

[0023] Figure 7 yes Figure 1 Cross-sectional view along the BB' direction.

[0024] Figure 8 yes Figure 1 Cross-sectional view along the CC' direction.

[0025] Figure 9 yes Figure 1 Cross-sectional view along the DD' direction.

[0026] The attached figures are labeled as follows:

[0027] 100. Waist-mounted fan; 10. Housing; 11. First main body; 111. Air inlet; 112. Air outlet; 113. Air outlet grille; 1131. First air guide section; 1132. Second air guide section; 114. First connecting section; 115. Second connecting section; 12. Volute tongue; 121. First flow restrictor; 122. Second flow restrictor; 123. Third flow restrictor; 13. Volute casing; 131. Fourth flow restrictor; 132. Fifth flow restrictor; 133. Sixth flow restrictor; 14. First inner shell; 141. First airflow section; 1411. 1412 First fan mounting slot; 1412 Bearing limiting part; 142 First charging clearance hole; 15 Second inner shell; 151 Second airflow part; 1511 Second fan mounting slot; 1512 Bushing limiting part; 152 First lighting clearance hole; 16 First cover; 161 Second charging clearance hole; 17 Second cover; 171 Second lighting clearance hole; 18 Lighting clearance structure; 19 Charging clearance structure; 101 Button clearance structure; 21 Circuit board housing space; 22 Airflow channel; 23 Battery cell housing space; 30. Cross-flow fan unit; 31. Motor; 32. Magnet; 33. Bearing; 34. First rotating shaft; 35. First impeller connector; 351. First shaft hole; 352. First drive gear; 353. Motor mounting part; 36. Cross-flow impeller; 361. Impeller frame; 362. Fan blade; 37. Second impeller connector; 371. Second shaft hole; 372. Second drive gear; 38. Second rotating shaft; 39. Bushing connector; 391. First bushing clearance hole; 301. Copper ring bushing; 3011. Second bushing clearance hole; 302. 40. Rubber ring; 41. Back clip; 42. Second body; 411. Third connecting part; 412. Hand lever part; 43. Screw cover plate; 50. Bracket; 51. Fourth connecting part; 60. Hem clip; 61. Fifth connecting part; 62. First clamping plate; 63. Bending part; 64. Second clamping plate; 70. Power supply unit; 80. Control unit; 81. Circuit board; 82. Button cover; 83. Charging interface; 90. Display unit; 91. LED light board; 92. Light shield; 93. Light shielding cover plate; 1001. Lighting unit; X, First direction. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0030] like Figure 1-8As shown, this embodiment relates to a waist-mounted fan 100. The waist-mounted fan 100 includes a housing 10, a volute tongue 12, a volute casing 13, and a cross-flow fan unit 30. The housing 10 has an air inlet 111 and an air outlet 112, with the air outlet 112 located at one end of the housing 10 in a first direction X. The volute tongue 12 and the volute casing 13 are both disposed within the housing 10. An airflow channel 22 is formed between the air inlet 111 and the air outlet 112, and the airflow channel 22 is specifically constructed by the housing 10, the volute tongue 12, and the volute casing 13. One end of the volute tongue 12 is connected to the air outlet 112, one end of the volute casing 13 is connected to the air inlet 111, and the other end of the volute casing 13 is connected to the air outlet 112.

[0031] A cross-flow fan unit 30 is disposed within the airflow channel 22, and its two ends are connected to the housing 10. The volute tongue 12 and the volute casing 13 are located on opposite sides of the cross-flow fan unit 30 and are spaced apart from it.

[0032] In this embodiment, a cross-flow fan unit 30 is used, which causes the airflow to rotate within the airflow channel 22. The volute tongue 12 includes a third flow-limiting part 123. By extending the third flow-limiting part 123 towards the cross-flow fan unit 30, the airflow is prevented from re-entering the airflow circulation of the cross-flow fan unit 30, while the airflow is guided to the air outlet 112, further increasing the airflow volume exiting the air outlet 112.

[0033] The volute 13 includes a sixth flow-limiting section 133, which extends towards the cross-flow fan unit 30. Airflow enters the airflow channel 22 from the air inlet 111 and gradually compresses along the portion of the volute 13 from the air inlet 111 to the sixth flow-limiting section 133 in the first direction X, thereby increasing the airflow pressure and velocity. In the first direction X, the distance from the portion of the volute 13 from the sixth flow-limiting section 133 to the air outlet 112 to the center of the cross-flow fan unit 30 gradually increases, resulting in a gradual increase in space in the first direction X, further increasing the airflow velocity. The first direction X is vertically upward. In some embodiments, in the airflow outflow direction, the distance from the portion of the volute 13 from the sixth flow-limiting section 133 to the air outlet 112 to the center of the cross-flow fan unit 30 gradually increases, further increasing the airflow velocity.

[0034] like Figure 2-3 , Figure 6 and Figure 8As shown, the volute tongue 12 includes a first flow-limiting part 121 and a second flow-limiting part 122. The first flow-limiting part 121 is disposed at the air inlet 111 and extends toward the cross-flow fan unit 30. The second flow-limiting part 122 is disposed at the air outlet 112 and extends toward the cross-flow fan unit 30. The end of the first flow-limiting part 121 away from the air inlet 111 is connected to the end of the second flow-limiting part 122 away from the air outlet 112, and the third flow-limiting part 123 is located at the connection between the first flow-limiting part 121 and the second flow-limiting part 122.

[0035] The volute 13 includes a fourth flow-limiting section 131 and a fifth flow-limiting section 132. The fourth flow-limiting section 131 is located at the air inlet 111 and extends towards the cross-flow fan unit 30. The fifth flow-limiting section 132 is located at the air outlet 112 and extends towards the cross-flow fan unit 30. The end of the fourth flow-limiting section 131 away from the air inlet 111 is connected to the end of the fifth flow-limiting section 132 away from the air outlet 112. A sixth flow-limiting section 133 is located at the connection between the fourth flow-limiting section 131 and the fifth flow-limiting section 132. The portion of the volute 13 from the sixth flow-limiting section 133 to the air outlet 112 constitutes the fifth flow-limiting section 132. In the first direction X, the distance from the fifth flow-limiting section 132 to the center of the cross-flow fan unit 30 gradually increases, resulting in a gradual increase in the space in the first direction X, thereby further increasing the outflow velocity.

[0036] In the extension direction of the second flow-limiting part 122, the second flow-limiting part 122 extends at least partially in the direction pointing from the second flow-limiting part 122 to the fifth flow-limiting part 132, so that the second flow-limiting part 122 is adapted to the gas flow direction in the airflow channel 22 near the air outlet 112, further preventing the airflow from re-entering the airflow circulation of the cross-flow fan unit 30, thereby increasing the airflow volume out of the air outlet 112. At the same time, the direction of the airflow out of the air outlet 112 is changed, specifically the airflow direction is adjusted to vertically upward, that is, the airflow direction is adjusted to the first direction X, which makes it more convenient for the waist-mounted fan 100 to blow airflow between the user's clothes and body.

[0037] Specifically, the distance from the third flow-limiting section 123 to the center of the cross-flow fan unit 30 is less than the distance from the first flow-limiting section 121 to the center of the cross-flow fan unit 30, and also less than the distance from the second flow-limiting section 122 to the center of the cross-flow fan unit 30. The distance from the sixth flow-limiting section 133 to the center of the cross-flow fan unit 30 is less than the distance from the fourth flow-limiting section 131 to the center of the cross-flow fan unit 30, and also less than the distance from the fifth flow-limiting section 132 to the center of the cross-flow fan unit 30.

[0038] More specifically, the airflow enters the airflow channel 22 from the air inlet 111, and is guided by the first flow restrictor 121 to the third flow restrictor 123, where it is circulated by the airflow of the cross-flow fan unit 30 to the sixth flow restrictor 133; or it is guided to the sixth flow restrictor 133 via the fourth flow restrictor 131. Passing through the compression space between the sixth flow restrictor 133 and the cross-flow fan unit 30, the airflow pressure and velocity are increased. Passing through the enlarged space between the fifth flow restrictor 132 and the cross-flow fan unit 30, the airflow velocity is further increased. Finally, the airflow is guided by the air outlet grille 133 or the second flow restrictor 122 to the air outlet 112, thus blowing the airflow out of the airflow channel 22, i.e., out of the waist-mounted fan 100.

[0039] In this embodiment, the fourth flow limiting part 131 is provided to facilitate the increase of the size of the air inlet 111 in the first direction X, thereby increasing the air intake volume and facilitating the increase of the air output volume.

[0040] In some other embodiments, the volute 13 includes a sixth flow limiting part 133 and a fifth flow limiting part 132. The sixth flow limiting part 133 is disposed at the air inlet 111, and the fifth flow limiting part 132 is disposed at the air outlet 112. The fifth flow limiting part 132 extends to the sixth flow limiting part 133.

[0041] like Figure 2-3 , Figure 7 and Figure 9 As shown, the housing 10 includes a first main body 11, a first inner shell 14, and a second inner shell 15. The first inner shell 14 and the second inner shell 15 are respectively covered at opposite ends of the first main body 11. The first main body 11 is a hollow structure. The first main body 11 has an air inlet 111 and an air outlet 112. The volute tongue 12 and the volute shell 13 are disposed inside the first main body 11. The first main body 11, the volute tongue 12, the volute shell 13, the first inner shell 14, and the second inner shell 15 together form an airflow channel 22. The cross-flow fan unit 30 is disposed inside the airflow channel 22. The opposite ends of the cross-flow fan unit 30 are respectively connected to the first inner shell 14 and the second inner shell 15.

[0042] Specifically, the first main body 11, the first inner shell 14, and the second inner shell 15 together form a receiving cavity. By spaced within the first main body 11 by a volute tongue 12 and a volute housing 13, the receiving cavity is divided into a circuit board receiving space 21, an airflow channel 22, and a battery cell receiving space 23. The circuit board receiving space 21 is used to receive the circuit board 81. The airflow channel 22 is used to receive the cross-flow fan unit 30 and allows airflow to pass through. The battery cell receiving space 23 is used to receive the power supply unit 70. The circuit board receiving space 21 is formed by the first main body 11, the first inner shell 14, the second inner shell 15, and the volute tongue 12. The airflow channel 22 is formed by the first main body 11, the first inner shell 14, the second inner shell 15, the volute tongue 12, and the volute housing 13. The battery cell receiving space 23 is formed by the first main body 11, the first inner shell 14, the second inner shell 15, and the volute housing 13. The power supply unit 70 is electrically connected to the circuit board 81 and the cross-flow fan unit 30 to provide power to the cross-flow fan unit 30.

[0043] More specifically, the first inner shell 14 is provided with a first airflow section 141. The first airflow section 141 is embedded in the airflow channel 22 and conforms to the shape of the airflow channel 22 to ensure the airtightness of the airflow channel 22. The first airflow section 141 has a first fan mounting groove 1411 for mounting one end of the cross-flow fan unit 30, specifically the end of the cross-flow fan unit 30 with the motor 31. The bottom of the first fan mounting groove 1411 is provided with a bearing limiting part 1412, which extends towards the second inner shell 15. The bearing limiting part 1412 has a hole for the bearing 33 to be inserted to fix the bearing 33.

[0044] The second inner shell 15 is provided with a second airflow section 151. The second airflow section 151 is embedded in the airflow channel 22 and conforms to the shape of the airflow channel 22 to ensure the airtightness of the airflow channel 22. The second airflow channel 22 has a second fan mounting groove 1511 for mounting one end of the cross-flow fan unit 30, specifically the end of the cross-flow fan unit 30 away from the motor 31. The bottom of the second fan mounting groove 1511 is provided with at least one bushing limiting part 1512, which extends towards the first inner shell 14. The bushing limiting part 1512 is used to embed into the second bushing clearance hole 3011 of the copper ring bushing 301 and the first bushing clearance hole 391 of the bushing connector 39, thereby preventing the circumferential rotation of the copper ring bushing 301.

[0045] like Figure 2-9As shown, the cross-flow fan unit 30 includes a motor 31, a magnet 32, a bearing 33, a first rotating shaft 34, a first impeller connector 35, a cross-flow impeller 36, a second impeller connector 37, a second rotating shaft 38, a bushing connector 39, a copper ring bushing 301, and a rubber ring 302. The motor 31 has a through hole at its center for the bearing limiting part 1412 to pass through. The first rotating shaft 34 is embedded in the center of the bearing 33, and both the first rotating shaft 34 and the bearing 33 are embedded in the bearing limiting part 1412. This places the first rotating shaft 34 inside the motor 31.

[0046] The first impeller connector 35 has a first shaft hole 351 for inserting the end of the first rotating shaft 34 away from the bearing 33, thereby fixing the end of the cross-flow fan unit 30 with the motor 31. The first impeller connector 35 also has a motor mounting part 353, which extends towards the first inner shell 14 and has a blind hole for inserting a magnet 32. When the cross-flow fan unit 30 is installed, the magnet 32 ​​is nested on the outside of the motor 31, so that the motor 31 drives the magnet 32 ​​to rotate, thereby driving the first impeller connector 35 to rotate. The first rotating shaft 34 is fitted with a rubber ring 302, specifically located between the bearing 33 and the first impeller connector 35.

[0047] The cross-flow impeller 36 includes a plurality of fan blades 362 and at least two impeller frames 361. The two impeller frames 361 are spaced apart. The fan blades 362 are disposed between the two impeller frames 361 and are evenly distributed circumferentially along the impeller frames 361. The first impeller connector 35 is further provided with a first drive tooth 352, which extends toward the cross-flow impeller 36 and embeds into the cross-flow impeller 36, further embedding between the fan blades 362. The shape of the first drive tooth 352 is adapted to the evenly distributed fan blades 362. In this embodiment, there are three impeller frames 361: one impeller frame 361 connects the first impeller connector 35 and the fan blades 362, one impeller frame 361 connects the second impeller connector 37 and the fan blades 362, and the remaining impeller frame 361 connects between the fan blades 362. The fan blades 362 on opposite sides of the middle impeller frame 361 are staggered to facilitate demolding.

[0048] The second impeller connector 37 includes a second drive tooth 372. The second drive tooth 372 extends toward the cross-flow impeller 36 and is embedded in the cross-flow impeller 36, further embedded between the fan blades 362. The shape of the second drive tooth 372 is adapted to the uniformly arranged fan blades 362. The second impeller connector 37 also includes a second shaft hole 371 for embedding a second rotating shaft 38. The end of the second rotating shaft 38 away from the second impeller connector 37 is embedded in a copper ring bushing 301. The copper ring bushing 301 is installed in the second fan mounting slot 1511, thereby fixing the end of the cross-flow fan unit 30 where the copper ring bushing 301 is located. A rubber ring 302 is sleeved on the second rotating shaft 38, specifically located between the copper ring bushing 301 and the second impeller connector 37.

[0049] A bushing connector 39 is provided between the copper ring bushing 301 and the second impeller connector 37. The bushing connector 39 has a hole through which at least a portion of the copper ring bushing 301 passes, for connecting the copper ring bushing 301, the second rotating shaft 38, and the second impeller connector 37. The bushing connector 39 has a first bushing clearance hole 391, and the copper ring bushing 301 has a second bushing clearance hole 3011. Both the first bushing clearance hole 391 and the second bushing clearance hole 3011 are used for the bushing limiting part 1512 to pass through. In some embodiments, the bushing limiting part 1512 has a hole for a screw to be inserted, and the bushing connector 39, the copper ring bushing 301, and the second inner shell 15 are fixedly connected by screws.

[0050] like Figure 2-3 and Figure 7-9 As shown, in this embodiment, the housing 10 further includes a first cover 16 and a second cover 17. The first cover 16 is installed on the side of the first inner housing 14 facing away from the first main body 11. The second cover 17 is installed on the side of the second inner housing 15 facing away from the second main body 41. A wiring structure is arranged between the first cover 16 and the first inner housing 14, or between the second cover 17 and the second inner housing 15. The wiring structure is used to electrically connect the cross-flow fan unit 30, the circuit board 81, and the power supply unit 70.

[0051] like Figure 1-3 and Figure 6-9 As shown, at least one air outlet grille 113 is provided at the air outlet 112. The air outlet grille 113 is disposed between the volute tongue 12 and the volute shell 13 and is spaced apart from the volute tongue 12 and the volute shell 13. The air outlet grille 113 includes a first air guide portion 1131 and a second air guide portion 1132. The second air guide portion 1132 is close to the cross-flow fan unit 30 and extends at least partially toward the cross-flow fan unit 30 and at least partially toward the volute shell 13. The first air guide portion 1131 extends at least partially in a direction away from the cross-flow fan unit 30 and at least partially in a first direction X.

[0052] In this embodiment, three air outlet grilles 113 are provided at the air outlet 112. The first air guide 1131 is used to control the air outlet direction. In this embodiment, the first air guide 1131 extends along the first direction X to facilitate blowing airflow between the user's clothing and body. The second air guide 1132 is adapted to the airflow direction in the airflow channel 22 near the air outlet 112 to facilitate guiding the airflow to the first air guide 1131, thereby adjusting the airflow to the desired direction through the first air guide 1131.

[0053] In some embodiments, the extension direction of the first air guide 1131 is adjusted according to the required airflow direction.

[0054] like Figure 1-3 , Figure 6 and Figure 8-9 As shown, the waist-mounted fan 100 also includes a back clip 40. The back clip 40 is disposed on the housing 10, adjacent to the air outlet 112 and away from the air inlet 111. The back clip 40 extends along a first direction X. The housing 10 has a first connecting portion 114, and the back clip 40 has a third connecting portion 411. The first connecting portion 114 is connected to the third connecting portion 411.

[0055] In some embodiments, in the first clamping state, the end of the back clip 40 away from the first connecting portion 114 is in contact with the housing 10. In the first unfolded state, the end of the back clip 40 away from the first connecting portion 114 is spaced apart from the housing 10.

[0056] In other embodiments, in the first clamping state, the end of the back clip 40 away from the first connecting portion 114 maintains a first minimum interval distance from the housing 10, and in the first unfolded state, the distance between the end of the back clip 40 away from the first connecting portion 114 and the housing 10 is greater than the first minimum interval.

[0057] Specifically, the back clip 40 includes a second body 41 and a screw cover plate 42. The second body 41 is provided with a third connecting portion 411 and a lever portion 412. The first connecting portion 114 and the third connecting portion 411 are connected by screws, and the screw cover plate 42 is provided on the third connecting portion 411 to prevent the screws from being exposed. The lever portion 412 is located at the end of the second body 41 away from the third connecting portion 411, and extends at least partially away from the housing 10. In this embodiment, the first connecting portion 114 is provided on the side of the first body 11 opposite to the air inlet 111.

[0058] In some embodiments, in the first clamping state, the end of the second body 41 away from the first connecting portion 114 is in contact with the housing 10. In the first unfolded state, the end of the second body 41 away from the first connecting portion 114 is spaced apart from the housing 10.

[0059] In other embodiments, in the first clamping state, the end of the second body 41 away from the first connecting portion 114 maintains a first minimum interval distance with the housing 10, and in the first unfolded state, the distance between the end of the second body 41 away from the first connecting portion 114 and the housing 10 is greater than the first minimum interval.

[0060] The user switches from the first clamping state to the first unfolded state by pulling the lever 412, in which the waist fan 100 is hung on pants or a belt. The user then releases the lever 412 to switch back from the first unfolded state to the first clamping state.

[0061] like Figure 2-3 , Figure 6 and Figure 8 As shown, the waist-mounted fan 100 also includes a bracket 50. The bracket 50 is disposed on the side of the back clip 40 opposite to the housing 10, and extends along a first direction X. The bracket 50 includes a fourth connecting portion 51, which is close to the third connecting portion 411, and is hinged to the back clip 40.

[0062] Specifically, the back clip 40 has a third shaft hole, and the fourth connecting part 51 has a fourth shaft hole. The third shaft hole and the fourth shaft hole are used for the hinged rotating shaft to pass through, so as to hinge the bracket 50 and the back clip 40.

[0063] More specifically, the back clip 40 has a groove for accommodating the bracket 50, so that the outer surface of the bracket 50 is flush with the outer surface of the back clip 40.

[0064] In some embodiments, in the retracted state, the end of the bracket 50 away from the third connecting portion 411 is in contact with the back clip 40. In the supported state, the end of the bracket 50 away from the third connecting portion 411 is spaced apart from the back clip 40.

[0065] In other embodiments, in the retracted state, the end of the bracket 50 away from the third connecting portion 411 maintains a second minimum interval distance from the back clip 40. In the supported state, the distance between the end of the bracket 50 away from the third connecting portion 411 and the back clip 40 is greater than the second minimum interval.

[0066] like Figure 1-3 , Figure 6 and Figure 8-9As shown, the waist-hanging fan 100 also includes a hem clip 60, which includes a fifth connecting portion 61, a first clip 62, a second clip 64, and a bending portion 63. A second connecting portion 115 is provided on the side of the housing 10 opposite to the back clip 40, and the fifth connecting portion 61 is connected to the second connecting portion 115. The first clip 62 is located at the end of the fifth connecting portion 61 away from the second connecting portion 115, and the first clip 62 extends at least partially in the direction opposite to the first direction X. The second clip 64 is located on the side of the first clip 62 opposite to the fifth connecting portion 61. One end of the bending portion 63 is connected to the end of the first clip 62 in the direction opposite to the first direction X, and the other end of the bending portion 63 is connected to the end of the second clip 64 in the direction opposite to the first direction X.

[0067] Specifically, the fifth connecting part 61 includes a snap fastener, a limiting structure extending along the first direction X, and a limiting structure extending along the length direction of the cross-flow fan unit 30. The second connecting part 115 has a snap hole, a limiting structure groove extending along the first direction X, and a limiting structure groove extending along the length direction of the cross-flow fan unit 30. The snap hole is used for the snap fastener to be inserted, so that the hem clip 60 is snapped together with the housing 10. The limiting structure extending along the first direction X is inserted into the limiting structure groove extending along the first direction X, and the limiting structure extending along the length direction of the cross-flow fan unit 30 is inserted into the limiting structure groove extending along the length direction of the cross-flow fan unit 30, so as to enhance the connection strength of the hem clip in the first direction X, and at the same time enhance the connection strength of the hem clip in the length direction of the cross-flow fan unit 30.

[0068] In some embodiments, in the second clamping state, the second clamping plate 64 is spaced apart from the first clamping plate 62, and the distance between the second clamping plate 64 and the first clamping plate 62 is a third minimum distance. In the second unfolded state, the distance between the end of the second clamping plate 64 away from the bend 63 and the first clamping plate 62 is greater than the third minimum distance.

[0069] Specifically, the hem of the garment is inserted between the first clamping plate 62 and the second clamping plate 64 to hold the hem in order to blow airflow between the user's clothes and body.

[0070] In other embodiments, in the second clamping state, the second clamping plate 64 is in contact with the first clamping plate 62. In the second unfolded state, the end of the second clamping plate 64 away from the bent portion 63 is spaced apart from the first clamping plate 62.

[0071] Specifically, the user moves the end of the second clamp 64 away from the bend 63 to switch from the second clamping state to the second unfolded state. In the second unfolded state, the hem of the garment is inserted between the first clamp 62 and the second clamp 64. Then, the user releases the end of the second clamp 64 away from the bend 63 to switch from the second unfolded state to the second clamping state, thereby clamping the hem of the garment so that airflow can be directed between the user's clothing and body.

[0072] More specifically, the hem clip 60 is disposed on the side of the air inlet 111 facing away from the cross-flow fan unit 30, and is spaced apart from the air inlet 111. The size of the air inlet 111 in the first direction X is larger than the size of the hem clip 60 in the first direction X, so as to expose the air inlet 111 and prevent the hem of the garment from completely blocking the air inlet 111. In some embodiments, the air inlet 111 extends to the bottom of the first body 11.

[0073] like Figure 1-3 , Figure 6 and Figure 9 As shown, the waist-mounted fan 100 also includes a lighting unit 1001, a circuit board 81, and a power supply unit 70. The lighting unit 1001, circuit board 81, and power supply unit 70 are all housed within the housing 10. The lighting unit 1001 is electrically connected to the circuit board 81, and the lighting unit 1001 is also electrically connected to the power supply unit 70. The circuit board 81 is electrically connected to the power supply unit 70. The housing 10 has a lighting clearance structure 18 to allow at least a portion of the lighting unit 1001 to be exposed.

[0074] Specifically, the lighting unit 1001 is an LED, which is mounted on the circuit board 81. The circuit board 81 is housed within the circuit board housing space 21. The lighting clearance structure 18 includes a first lighting clearance hole 152 and a second lighting clearance hole 171. The first lighting clearance hole 152 is located in the second inner shell 15, and the second lighting clearance hole 171 is located in the second cover shell 17. The first lighting clearance hole 152 and the second lighting clearance hole 171 are aligned. When the first main body 11, the second inner shell 15, and the second cover shell 17 are assembled as a single unit, the first lighting clearance hole 152 and the second lighting clearance hole 171 are exposed to allow the lighting unit 1001 to be illuminated.

[0075] like Figure 2-3 and Figure 9 As shown, the waist-mounted fan 100 also includes a display unit 90, a circuit board 81, and a power supply unit 70. The display unit 90, circuit board 81, and power supply unit 70 are all housed within the housing 10. The display unit 90 is electrically connected to the circuit board 81, and the display unit 90 is electrically connected to the power supply unit 70. The circuit board 81 is also electrically connected to the power supply unit 70. The housing 10 has a display clearance structure for the display unit 90 to display information. The display clearance structure is located on the first main body 11. The displayed information includes power information and speed setting information.

[0076] In some embodiments, the display unit 90 includes an LED light panel 91, a light shield 92, and a light shield cover 93. Both the LED light panel 91 and the light shield 92 are disposed on the circuit board 81. The light shield 92 covers the side of the LED light panel 91 facing the first main body 11 and has holes to expose the light while preventing light crosstalk between adjacent LEDs, which could affect the display of information. The light shield cover 93 covers the display clearance structure to prevent the LED light panel 91, the light shield 92, and the circuit board 81 from being directly exposed.

[0077] Specifically, a sticker is provided on the side of the light shield 92 facing away from the circuit board 81. The sticker has shaped holes so that the displayed information presents the corresponding shape.

[0078] In other embodiments, the display unit 90 is a display screen that displays power information and gear information.

[0079] like Figure 1-3 , Figure 6 and Figure 8-9 As shown, the waist-mounted fan 100 also includes a control unit 80. The control unit 80 includes a circuit board 81 and buttons. A charging interface 83 is located at the end of the circuit board 81 furthest from the lighting unit 1001. The housing 10 has a charging clearance structure 19 to allow the charging interface 83 to be electrically connected to an external power source. The housing 10 also has a button clearance structure 101 to allow the buttons to protrude from the housing 10.

[0080] Specifically, the charging clearance structure 19 includes a first charging clearance hole 142 and a second charging clearance hole 161. The first inner shell 14 has the first charging clearance hole 142, and the first cover 16 has the second charging clearance hole 161. When the first main body 11, the first inner shell 14, and the first cover 16 are assembled as a single unit, the first charging clearance hole 142 and the second charging clearance hole 161 are aligned to allow the charging interface 83 to be electrically connected to an external power source. A button cover 82 is provided on the side of the button away from the circuit board 81, and the button cover 82 is embedded in the button clearance structure 101 for the user to press, thereby controlling the waist-mounted fan 100.

[0081] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A waist-mounted fan, characterized in that, include: The housing has an air inlet and an air outlet, with the air outlet located at one end of the housing in a first direction; A volute tongue is disposed inside the housing, and one end of the volute tongue is connected to the air outlet; A volute is disposed inside the housing, with one end of the volute connected to the air inlet and the other end of the volute connected to the air outlet; An airflow channel is disposed between the air inlet and the air outlet, and is formed by the housing, the volute tongue, and the volute shell. A cross-flow fan unit is disposed within the airflow channel. The opposite ends of the cross-flow fan unit are connected to the housing. The volute tongue and the volute housing are respectively located on opposite sides of the cross-flow fan unit and are spaced apart from the cross-flow fan unit. The volute tongue includes a third flow-limiting part that extends toward the cross-flow fan unit. The volute casing includes a sixth flow-limiting part that extends toward the cross-flow fan unit. In the first direction, the distance from the portion of the volute casing from the sixth flow-limiting part to the air outlet to the center of the cross-flow fan unit gradually increases.

2. The waist-mounted fan as described in claim 1, characterized in that, The volute tongue includes a first flow-limiting part and a second flow-limiting part. The first flow-limiting part is disposed at the air inlet and extends toward the cross-flow fan unit. The second flow-limiting part is disposed at the air outlet and extends toward the cross-flow fan unit. The end of the first flow-limiting part away from the air inlet is connected to the end of the second flow-limiting part away from the air outlet. The third flow-limiting part is located at the connection between the first flow-limiting part and the second flow-limiting part. The volute includes a fourth flow-limiting part and a fifth flow-limiting part. The fourth flow-limiting part is disposed at the air inlet and extends toward the cross-flow fan unit. The fifth flow-limiting part is disposed at the air outlet and extends toward the cross-flow fan unit. The end of the fourth flow-limiting part away from the air inlet is connected to the end of the fifth flow-limiting part away from the air outlet. The sixth flow-limiting part is located at the connection between the fourth flow-limiting part and the fifth flow-limiting part. Wherein, in the extending direction of the second flow limiting part, the second flow limiting part extends at least partially in the direction pointing from the second flow limiting part to the fifth flow limiting part.

3. The waist-mounted fan as described in claim 1, characterized in that, The housing includes a first main body, a first inner shell, and a second inner shell. The first inner shell and the second inner shell are respectively disposed on opposite ends of the first main body. The first main body is a hollow structure and has an air inlet and an air outlet. The volute tongue and the volute shell are disposed inside the first main body. The first main body, the volute tongue, the volute shell, the first inner shell, and the second inner shell together form the airflow channel. The cross-flow fan unit is disposed inside the airflow channel, and the opposite ends of the cross-flow fan unit are respectively connected to the first inner shell and the second inner shell.

4. The waist-mounted fan as described in claim 1, characterized in that, At least one air outlet grille is provided at the air outlet. The air outlet grille is disposed between the volute tongue and the volute shell and is spaced apart from the volute tongue and the volute shell. The air outlet grille includes a first air guide portion and a second air guide portion. The second air guide portion is close to the cross-flow fan unit and extends at least partially toward the cross-flow fan unit and at least partially toward the volute shell. The first air guide portion extends at least partially in a direction away from the cross-flow fan unit and at least partially in a first direction.

5. The waist-mounted fan as described in claim 1, characterized in that, It also includes a back clip, which is disposed on the housing, on the side adjacent to the air outlet and away from the air inlet, the back clip extends along the first direction, the housing is provided with a first connecting part, the back clip is provided with a third connecting part, and the first connecting part is connected to the third connecting part; In the first clamping state, the end of the back clip away from the first connecting part is in contact with the housing; in the first unfolded state, the end of the back clip away from the first connecting part is spaced apart from the housing. Alternatively, in the first clamping state, the end of the back clamp away from the first connecting part maintains a first minimum interval distance with the housing, and in the first unfolded state, the distance between the end of the back clamp away from the first connecting part and the housing is greater than the first minimum interval.

6. The waist-mounted fan as described in claim 5, characterized in that, It also includes a bracket, which is disposed on the side of the back clip facing away from the housing. The bracket extends along the first direction and includes a fourth connecting portion, which is close to the third connecting portion and is hinged to the back clip. In the folded state, the end of the bracket away from the third connecting part is in contact with the back clip; in the supported state, the end of the bracket away from the third connecting part is spaced apart from the back clip. Alternatively, in the retracted state, the end of the bracket away from the third connecting part maintains a second minimum interval distance with the back clip; in the supported state, the distance between the end of the bracket away from the third connecting part and the back clip is greater than the second minimum interval.

7. The waist-mounted fan as described in claim 5, characterized in that, It also includes a hem clip, the hem clip comprising: The fifth connecting part is provided on the side of the housing opposite to the back clip, and the fifth connecting part is connected to the second connecting part; A first clamping plate is disposed at the end of the fifth connecting portion away from the second connecting portion, and the first clamping plate extends at least partially in the opposite direction to the first direction; The second clamping plate is disposed on the side of the first clamping plate that is opposite to the fifth connecting part; The bending portion has one end connected to one end of the first clamping plate in the opposite direction of the first direction, and the other end connected to one end of the second clamping plate in the opposite direction of the first direction. In the second clamping state, the second clamping plate is spaced apart from the first clamping plate, and the distance between the second clamping plate and the first clamping plate is the third minimum distance. In the second unfolded state, the distance between the end of the second clamping plate away from the bent part and the first clamping plate is greater than the third minimum distance. Alternatively, in the second clamping state, the second clamping plate is in contact with the first clamping plate, and in the second unfolding state, the end of the second clamping plate away from the bent portion is spaced apart from the first clamping plate.

8. The waist-mounted fan as described in claim 7, characterized in that, The hem clip is located on the side of the air inlet facing away from the cross-flow fan unit and is spaced apart from the air inlet. The size of the air inlet in the first direction is larger than the size of the hem clip in the first direction.

9. The waist-mounted fan as described in claim 1, characterized in that, It also includes a lighting unit, a circuit board, and a power supply unit. The lighting unit, the circuit board, and the power supply unit are all housed within the housing. The lighting unit is electrically connected to the circuit board, the lighting unit is electrically connected to the power supply unit, and the circuit board is electrically connected to the power supply unit. The housing has a lighting clearance structure to expose at least a portion of the lighting unit.

10. The waist-mounted fan as described in claim 1, characterized in that, It also includes a display unit, a circuit board, and a power supply unit. The display unit, the circuit board, and the power supply unit are all housed within the housing. The display unit is electrically connected to the circuit board and the power supply unit. The circuit board is electrically connected to the power supply unit. The housing has a display clearance structure for the display unit to display information.

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