Angle switch structure of rotary blowing and sucking dual-purpose machine

Abstract

The angle switch structure comprises a machine body, a fan cover with air ports and an electric loop, the air ports comprise an air inlet and an air outlet, the fan cover is rotatably connected to the machine body, the fan cover rotates relative to the machine body to change the orientation of the air inlet and / or the air outlet, and an angle identification switch is arranged between the fan cover and the machine body. The angle identification switch is connected with the electric loop, the angle identification switch is triggered to be in an on state when the fan cover rotates to a set angle position relative to the machine body, and the fan cover of the blowing and sucking dual-purpose machine is limited to be started only when the fan cover rotates to a set angle through the arranged angle identification switch. The situation that when the fan cover is rotated to adjust the air opening, the fan cover is mistakenly used and blows air to a holding person or surrounding persons is avoided.

Description

Technical Field

[0001] The utility model relates to a blowing and suction dual-purpose machine, in particular to an angle switch structure of a rotary blowing and suction dual-purpose machine. Background Art

[0002] A blowing and suction (wind) machine mainly consists of a motor, a wind blade, a machine shell, an air inlet filter screen, a wind nozzle, etc. It is commonly used for dust removal operations of electrical appliances such as computers and air conditioners. Its principle is that the motor rotates to drive the wind blade to rotate at a high speed. After the filtered clean air enters the blowing and suction machine and generates a certain pressure, it is blown out from the wind nozzle. With the improvement of the structure, the existing blowing and suction (wind) machine already has the functions of blowing and suction, and has two wind nozzles at different positions, namely a blowing port and an air inlet. When using the suction function, to collect dust, debris and the like, a dust collection bag must be used. Although the blowing and suction (wind) machine already has the two functions of blowing and suction, the handle or the machine shell cannot rotate, and there may be a problem that the blowing operation or the dust suction operation is convenient to use, but it is awkward to hold and use after switching to another operation.

[0003] To solve the above problems, there are blowing and suction dual-purpose machines on the market that can rotate and adjust the direction of the air inlet or the air outlet. For example, the Chinese utility model patent CN205676815U, a blowing and suction dual-purpose machine with a rotary handle, includes a housing, a motor arranged in the housing, and a wind impeller driven by the motor. The housing includes a wind cover arranged outside the wind impeller and a rotatable rotary handle sleeved on the motor. The rotary handle includes a rotary guard part covering the motor and a handle part connected to the rotary guard. A plurality of annular and concave-convex rotary guide grooves are sleeved and connected on the motor. At the same time, concave-convex rotary clamping grooves are arranged at positions opposite to the rotary guide grooves on the inner side of the rotary guard. Then, a rotatable connection is formed between the rotary guard and the motor through the rotary guide grooves and the rotary clamping grooves, and the position of the handle can be adjusted by rotation according to different air outlets, so as to achieve the purpose of convenient operation.

[0004] For the problems existing in the existing blowing and suction dual-purpose machines, when changing the orientation of the air outlet by rotating and adjusting the angular position of the wind cover, even if the wind cover is not rotated to the required set angular position, the blowing and suction dual-purpose machine can be started by pressing the power switch. During the process of rotating and adjusting the wind cover by the user, it is easy to accidentally touch the power switch and start the machine without preparation, causing the air outlet to blow air at the person holding the machine or the people around, and the blown air may carry small stones or other particulate matters inhaled during dust suction, posing a certain risk in use. Content of the Utility Model

[0005] Based on the problem that during the process of adjusting the orientation of the air outlet by rotating the air shroud, the blowing and suction fan is misused, causing the air outlet to blow air at the person holding the machine or people around, and the blown air may carry small stones or other particulate matters inhaled during dust collection, there is a certain risk in use. The present utility model provides an angle switch structure for a rotary blowing and suction dual-purpose machine.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is: an angle switch structure for a rotary blowing and suction dual-purpose machine, including a body, an air shroud having an air outlet, and an electrical circuit. The air outlet includes an air inlet and an air outlet. The air shroud is rotatably connected to the body, and the air shroud rotates relative to the body to change the orientation of the air inlet and / or the air outlet. An angle recognition switch is provided between the air shroud and the body, and the angle recognition switch is connected to the electrical circuit. When the air shroud rotates relative to the body to a set angle position, the angle recognition switch is triggered to be in an on state.

[0007] A further preferred technical solution of the present utility model is: the angle recognition switch includes a leaf spring provided on the body and a contact piece provided on the air shroud. When the air shroud rotates relative to the body to a set angle position, the contact piece contacts the leaf spring, causing the angle recognition switch to be turned on.

[0008] A further preferred technical solution of the present utility model is: four contact pieces are provided on the air shroud, all four contact pieces are metal contacts, and the four contact pieces are annularly arranged on the air shroud centered on the rotation center of the air shroud. Two leaf springs are provided on the body, and the two leaf springs are also metal contacts. The two leaf springs respectively contact two of the contact pieces. When the air shroud rotates 90° relative to the body, the leaf spring rotates from above the upper-stage contact piece to above the adjacent lower-stage contact piece.

[0009] A further preferred technical solution of the present utility model is: the perpendicular connection line between one leaf spring and the rotation center line of the air shroud and the perpendicular connection line between the other leaf spring and the rotation center line of the air shroud form a 90° angle.

[0010] A further preferred technical solution of the present utility model is: the contact piece is strip-shaped, at least two sections of contact pieces are provided on the air shroud, two leaf springs are provided on the body. When the air shroud rotates relative to the body to a set angle position, the two leaf springs respectively contact two of the contact pieces, and the contact piece has a range for the leaf spring to rotate thereon.

[0011] A further preferred technical solution of the present utility model is: the body includes a grip and a main housing fixed to the front end of the grip. The air shroud is located below the main housing and is rotatably connected to the main housing. The contact piece is provided on the top surface of the air shroud, and a leaf spring for contact cooperation with the contact piece is provided at the bottom of the main housing.

[0012] A further preferred technical solution of the present utility model is that the air inlet and the air outlet are arranged on both sides of the air hood, and the opening directions of the air inlet and the air outlet are parallel. The opening directions of the air inlet and the air outlet are both perpendicular to the rotation center line of the air hood. There is a 180° between the air inlet and the air outlet. The air inlet and the air outlet are located on both sides of the rotation center line of the air hood. When one of the air inlet and the air outlet rotates to have its opening facing forward, the other rotates to have its opening facing backward.

[0013] A further preferred technical solution of the present utility model is that a rotating shell for installing a motor is fixed on the top of the air hood. The main machine shell covers the rotating shell and is rotatably connected to the rotating shell. A rotation positioning device is arranged between the rotating shell and the main machine shell. The rotation positioning device includes a locking button arranged on the main machine shell and capable of linear movement, a return spring for driving the locking button to move and reset, and three positioning grooves arranged on the circumference of the rotating shell. The angle between adjacent two positioning grooves is 90°. The locking button is snapped into the positioning groove to lock the relative rotation of the air hood and the fuselage.

[0014] A further preferred technical solution of the present utility model is that when one of the air inlet and the air outlet rotates to have its opening facing forward, the holding center line of the handle is parallel or quasi-parallel to the opening directions of the air inlet and the air outlet.

[0015] A further preferred technical solution of the present utility model is that a wire groove surrounding the rotating shell is provided on the top of the air hood, and the wires connecting the contact pieces are laid in the wire groove.

[0016] Compared with the prior art, the advantage of the present utility model is that an angle recognition switch is arranged between the air hood and the fuselage. When the air hood rotates relative to the fuselage to a set angle position, the angle recognition switch is triggered and in an on state. Only at this time can the blow-suction dual-purpose machine be started. By setting the angle recognition switch, it is restricted that the air hood of the blow-suction dual-purpose machine can only be started when it rotates to the set angle, avoiding being misused to blow air at the person holding it or the people around when adjusting the air outlet by rotating the air hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be used as a limitation to the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a side view of the blow-suction dual-purpose machine when the air outlet faces backward and the air inlet faces forward;

[0019] Figure 2 Schematic cross-sectional view when the air outlet faces backward and the air inlet faces forward;

[0020] Figure 3 State diagram when the air inlet and the air outlet rotate to the left and right sides;

[0021] Figure 4 State diagram when the air outlet faces forward and the air inlet faces backward;

[0022] Figure 5 For Figure 4 Local enlarged view of part A;

[0023] Figure 6 Schematic structural diagram of the wind hood and the rotating shell;

[0024] Figure 7 Schematic structural diagram of the fuselage;

[0025] Figure 8 For Figure 7 Local enlarged view of part B;

[0026] Figure 9 Partial schematic diagram when the elastic piece contacts the contact piece;

[0027] Figure 10 Schematic structural diagram of the wind hood;

[0028] Figure 11 State diagram when the wind hood and the fuselage rotate relative to each other;

[0029] Figure 12 For Figure 11 Position relationship diagram of the elastic piece and the contact piece in the state;

[0030] In the figure: 1. Fuselage; 2. Handle; 3. Main housing; 4. Wind hood; 5. Air outlet; 6. Air inlet; 7. Nozzle; 8. Rotation center line of the wind hood; 9. Controller; 10. Speed control switch; 11. Holding center line; 12. Top cover; 13. Rotating sleeve; 14. Motor; 15. First through hole; 16. Upper cover shell; 17. First wind cavity; 18. Wind impeller; 19. Intermediate cover shell; 20. Wire groove; 21. Second through hole; 22. Second wind cavity; 23. Lower cover shell; 24. Vertical connection line; 25. Opening direction of the air inlet; 26. Opening direction of the air outlet; 27. Rotation positioning device; 28. Air duct; 29. Rotating shell; 30. Annular card slot; 31. First outer ring edge; 32. Locking button; 33. Positioning slot; 34. Return spring; 35. Bottom opening; 36. Elastic piece; 37. Electric wire; 38. Pressing plate; 39. First contact piece; 40. Second contact piece; 41. Third contact piece; 42. Fourth contact piece. Detailed implementation manners

[0031] Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the scope of protection of the present utility model.

[0032] It should be noted that like reference numerals represent like items in the following drawings. Therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings.

[0033] Figures 1 - 12 As shown, the angle switch structure of the rotary blowing and suction dual-purpose machine includes a body 1, a wind hood 4 with an air outlet, and an electric circuit. The air outlet includes an air inlet 6 and an air outlet 5. The wind hood 4 is rotatably connected to the body 1. The wind hood 4 rotates relative to the body 1 to change the orientation of the air inlet 6 and / or the air outlet 5. An angle recognition switch is provided between the wind hood 4 and the body 1. The angle recognition switch is connected to the electric circuit. When the wind hood 4 rotates relative to the body 1 to a set angle position, the angle recognition switch is triggered and turned on.

[0034] Figures 7 - 10 As shown, the angle recognition switch includes a spring piece 35 provided on the body 1 and a contact piece provided on the wind hood 4. When the wind hood 4 rotates relative to the body 1 to a set angle position, the contact piece contacts the spring piece 35, turning on the angle recognition switch. Only after the angle recognition switch is turned on can the blowing and suction dual-purpose machine be started. By providing the angle recognition switch, it is restricted that the wind hood 4 of the blowing and suction dual-purpose machine can only be started when it rotates to a set angle, avoiding accidental use and blowing air at the person holding it or people around when adjusting the air outlet by rotating the wind hood 4.

[0035] Figures 1 - 6 As shown, the body 1 includes a grip 2 and a main housing 3 fixed to the front end of the grip 2. The wind hood 4 is located below the main housing 3 and is rotatably connected to the main housing 3. A controller 9 is fixed to the rear end inside the grip 2. A motor 14 is housed in the main housing 3 and is electrically connected to the controller 9. A wind impeller 18 is housed in the wind hood 4. The above-mentioned contact piece is provided on the top surface of the wind hood 4, and a spring piece 35 in contact and cooperation with the contact piece is provided at the bottom of the main housing 3.

[0036] The controller 9 is an existing control circuit board. A power switch is provided on the body 1. The power switch is electrically connected to the controller 9. The power switch is on the above-mentioned electric circuit. When the angle recognition switch is turned on, the user presses the power switch to turn it on, thereby turning on the electric circuit and starting the motor 14 to work. When the motor 14 drives the wind impeller 18 to rotate in the wind hood 4, an air flow is formed that enters from the air inlet 6, passes through the inside of the wind hood 4, and exits from the air outlet 5.

[0037] At the top of the wind shield 4, there is a rotating shell 29 for installing the motor 14. The main housing 3 covers the rotating shell 29 and is rotationally connected to the rotating shell 29. Specifically, the rotating shell 29 is fixedly connected to the top of the wind shield 4 by screws. There is an annular slot 30 on the inner wall of the main housing 3, and a first outer ring edge 31 that matches the annular slot 30 is provided on the outer wall of the rotating shell 29. The first outer ring edge 31 is stuck in the annular slot 30 to rotationally connect the main housing 3 and the rotating shell 29 together, so that the fuselage 1 and the wind shield 4 are rotationally connected.

[0038] The main housing 3 and the grip 2 are integrally formed. The fuselage 1 includes a left half shell and a right half shell. After the left half shell and the right half shell are aligned, they are fixedly connected together by screws. When connecting, the left half shell and the right half shell are clamped on both sides of the rotating shell 29 and then fixed by screws, so that the rotating shell 29 is covered and rotates inside the main housing 3. There is a bottom opening 35 at the bottom of the main housing 3 for the rotating shell 29 covered inside the main housing 3 to be connected to the wind shield 4 below.

[0039] Preferably, the rotating shell 29 includes a rotating sleeve 13 with an upward opening and a top cover 12. Both ends of the rotating sleeve 13 are through. The lower end of the rotating sleeve 13 abuts against the top of the wind shield 4 and is fixed to the wind shield 4 by screws. The top cover 12 is fixed to the upper end of the rotating sleeve 13 by screws. The top cover 12 and the rotating sleeve 13 enclose a motor cavity for installing the motor 14. The motor 14 is fixed in the motor cavity. There is a first through hole 15 on the top of the wind shield 4 for the output shaft of the motor 14 to extend into the wind shield 4 to be connected to the wind impeller 18. The rotation center line of the wind impeller 18 coincides with the rotation center line 8 of the wind shield.

[0040] Figure 2 、 Figure 6 As shown, the above-mentioned air inlet 6 and air outlet 5 are respectively arranged on both sides of the wind shield 4. The opening direction 25 of the air inlet is parallel to the opening direction 26 of the air outlet. Both the opening direction 25 of the air inlet and the opening direction 26 of the air outlet are perpendicular to the rotation center line 8 of the wind shield. The air inlet 6 and the air outlet 5 are 180°. The air inlet 6 and the air outlet 5 are located on both sides of the rotation center line 8 of the wind shield. When one of the air inlet 6 and the air outlet 5 rotates to face forward, the other rotates to face backward.

[0041] When the air inlet 6 rotates to the front side and the air outlet 5 rotates to the rear side, the opening of the air inlet 6 faces forward and the opening of the air outlet 5 faces backward. The user can hold the grip 2 to perform the dust suction operation. When the air inlet 6 rotates to the rear side and the air outlet 5 rotates to the front side, the opening of the air inlet 6 faces backward and the opening of the air outlet 5 faces forward. The user can hold the grip 2 to perform the blowing operation, so that when performing the blowing operation or the dust suction operation, the air outlet 5 and the air inlet 6 face the front of the blow-suction machine body, making the overall use more convenient.

[0042] Figure 2 As shown, when one of the air inlets 6 and the air outlets 5 rotates to face forward, the other rotates to face backward. At this time, the holding center line 11 of the handle 2 is parallel or quasi-parallel to the opening direction 25 of the air inlet 6 and the opening direction 26 of the air outlet 5.

[0043] Specifically, when the air hood 4 rotates to the angular position where the air inlet 6 is in front of it, the air outlet 5 is behind it. At this time, the opening of the air inlet 6 faces forward, and the opening of the air outlet 5 faces backward. The air outlet 5 located behind is below the handle 2. When the air hood 4 rotates to the angular position where the air inlet 6 is behind it, the air outlet 5 is in front of it. At this time, the opening of the air inlet 6 faces backward, and the opening of the air outlet 5 faces forward. The air inlet 6 located behind is below the handle 2.

[0044] Preferably, air nozzles 7 extend from both sides of the air hood 4. The air inlet 6 and the air outlet 5 are respectively arranged on the air nozzles 7 on both sides. When the air inlet 6 or the air outlet 5 rotates to the front of the air hood 4 through the air nozzles 7, the air inlet 6 or the air outlet 5 is located on the front side of the fuselage 1 for air intake or air outlet.

[0045] Preferably, the air hood 4 includes an upper housing 16, a middle housing 19, and a lower housing 23. The upper housing 16 is fixedly connected to the upper side of the middle housing 19 by screws. The upper housing 16 and the middle housing 19 form a first air cavity 17 and an air outlet 5 communicating with the first air cavity 17. The air impeller 18 is arranged in the first air cavity 17. The air impeller 18 is a centrifugal fan. The lower housing 23 is fixedly connected to the lower side of the middle housing 19 by screws. The lower housing 23 and the middle housing 19 form a second air cavity 22 and an air inlet 6 communicating with the second air cavity 22. The middle housing 19 is provided with a second through hole 21 on the rotation center line of the air impeller 18 and opposite to the air impeller 18. The second through hole 21 communicates the first air cavity 17 and the second air cavity 22. The second through hole 21 and the air outlet 5 realize axial air intake and radial air outlet of the air impeller 18. The second air cavity 22 is used to change the air intake direction of the air hood 4 so that the opening direction 25 of the air inlet can be set perpendicular to the rotation center line of the air impeller 18.

[0046] Figures 4 - 6As shown, a rotation positioning device 27 is provided between the rotating housing 29 and the main housing 3. The rotation positioning device 27 includes a locking button 32 that is arranged on the main housing 3 and can move linearly, a return spring 34 that drives the locking button 32 to move and reset, and three positioning grooves 33 arranged on the circumference of the rotating housing 29. The angle between two adjacent positioning grooves 33 is 90°. The locking button 32 is snapped into the positioning groove 33 to lock the relative rotation of the wind hood 4 and the fuselage 1. By pushing the locking button 32 to move, it can be disengaged from the positioning groove 33, so that the wind hood 4 and the fuselage 1 can rotate. Rotate the wind hood 4 to adjust the angular positions of the air inlet 6 and the air outlet 5. After adjustment, release the locking button 32, and the return spring 34 pushes the locking button 32 to move and reset, so that the locking button 32 is snapped into the relative positioning groove 33 to lock the rotation.

[0047] The positioning groove 33 is formed by a notch on the above-mentioned first outer ring edge 31.

[0048] Figures 1 - 3 As shown, through the three positioning grooves 33 arranged on the circumference of the rotating housing 29, and the angle between two adjacent positioning grooves 33 is 90°, the wind hood 4 has three locking positions. Rotate the wind hood 4 by 90° to rotate the wind hood 4 from the previous locking position to the next locking position. The three locking positions respectively correspond to the 0° position where the air inlet 6 rotates to the front side and the opening faces forward, the 90° position where the air inlet 6 and the air outlet 5 face the left side and the right side respectively, and the 180° position where the air outlet 5 rotates to the front side and the opening faces forward.

[0049] When the wind hood 4 rotates to the 90° position, one of the air inlet 6 and the air outlet 5 rotates to the left side and the opening faces left, and the other air outlet rotates to the right side and the opening faces right. This angular position can be used when it is necessary to use it sideways in a narrow space.

[0050] Figures 9 - 12 As shown, four contact pieces are provided on the wind hood 4. All four contact pieces are metal contacts. The four contact pieces are annularly arranged on the top of the wind hood 4 with the rotation center of the wind hood 4 as the center. There are two elastic pieces 35. The two elastic pieces 35 are also metal contacts. The two elastic pieces 35 are respectively in contact with two of the contact pieces. When the wind hood 4 rotates 90° relative to the fuselage 1, the elastic piece 35 rotates from above the previous-level contact piece to above the adjacent next-level contact piece.

[0051] The perpendicular connection line 24 between one elastic piece 35 and the rotation center line 8 of the wind hood forms a 90° angle with the perpendicular connection line 24 between the other elastic piece 35 and the rotation center line 8 of the wind hood.

[0052] The four contact pieces are distributed at the four corners and sequentially include a first contact piece 39, a second contact piece 40, a third contact piece 41, and a fourth contact piece 42. The two elastic pieces 35 first contact the first contact piece 39 and the second contact piece 40 respectively. Then, after the wind cover 4 rotates 90° relative to the fuselage 1, the two elastic pieces 35 switch to contact the second contact piece 40 and the third contact piece 41 respectively. After the wind cover 4 rotates 90° again relative to the fuselage 1, the two elastic pieces 35 switch to contact the third contact piece 41 and the fourth contact piece 42 respectively, so that the wind cover 4 has three set angular positions, corresponding to the 0° position where the air inlet 6 rotates to the front side and the opening faces forward, the 90° position where the air inlet 6 and the air outlet 5 face the left side and the right side respectively, and the 180° position where the air outlet 5 rotates to the front side and the opening faces forward. Thus, the blow-suction dual-purpose machine can be used for conventional blowing operations and dust suction operations.

[0053] The first contact piece 39 and the third contact piece 41 are connected by a wire 37, and the second contact piece 40 and the fourth contact piece 42 are connected by a wire 37. One ends of the two wires 37 are joined, and the other ends are disconnected. The two elastic pieces 35 are respectively connected to a speed control switch 10 provided on the fuselage 1 through the wires 37, and the speed control switch 10 is connected to a controller 9 through the wire 37.

[0054] The electrical connection between the electronic components on the wind cover 4 and the electronic components on the fuselage 1 is achieved through the contact between the contact pieces and the elastic pieces 35, so that there is no need for wire passing between the wind cover 4 and the fuselage 1, thereby making the overall wiring of the machine simpler and not easily damaged due to rotation.

[0055] A wire groove 20 is provided on the top surface of the wind cover 4 around the rotating shell 29, and the wires 37 connecting the contact pieces are laid in the wire groove 20, and the opening of the wire groove 20 is covered by a pressure plate 38 connected by a buckle.

[0056] The above air inlet 6 and air outlet 5 need to be connected to an air duct 28 during use.

[0057] For the structure of the above elastic pieces 35 and contact pieces, we have another solution. The contact pieces are set as strips, and at least two sections of contact pieces are provided on the wind cover 4. Two elastic pieces 35 are provided on the fuselage 1. When the wind cover 4 rotates to a set angular position relative to the fuselage 1, the two elastic pieces 35 respectively contact two of the contact pieces. The contact pieces have a range for the elastic pieces 35 to rotate on them, so that the blow-suction fan can also be normally started at other required angular positions except the 0° position, 90° position, and 180° position. Preferably, the contact pieces are arc-shaped.

[0058] The above has introduced the angle switch structure of the rotary blowing and suction dual-purpose machine provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the present utility model and its core idea. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. Angle switch structure of a rotary blowing and suction dual-purpose machine, comprising a body, a wind hood with air outlets, and an electrical circuit. The air outlets include an air inlet and an air outlet. The wind hood is rotatably connected to the body, and the wind hood rotates relative to the body to change the orientation of the air inlet and / or the air outlet. It is characterized in that, An angle recognition switch is provided between the wind hood and the fuselage. The angle recognition switch is connected to an electric circuit. When the wind hood rotates relative to the fuselage to a set angle position, the angle recognition switch is triggered and turned on.

2. The angle switch structure of the rotary blow-suction dual-purpose machine according to claim 1, characterized in that, The angle recognition switch includes a shrapnel provided on the fuselage and a contact piece provided on the wind hood. When the wind hood rotates relative to the fuselage to a set angle position, the contact piece contacts the shrapnel, turning on the angle recognition switch.

3. The angle switch structure of the rotary blow-suction dual-purpose machine according to claim 2, characterized in that, Four contact pieces are provided on the wind hood. All four contact pieces are metal contacts. The four contact pieces are annularly arrayed on the wind hood centered on the rotation center of the wind hood. Two shrapnels are provided on the fuselage. The two shrapnels are also metal contacts. The two shrapnels respectively contact two of the contact pieces. When the wind hood rotates 90° relative to the fuselage, the shrapnel rotates from above the upper-level contact piece to above the adjacent lower-level contact piece.

4. The angle switch structure of the rotary blow-suction dual-purpose machine according to claim 3, wherein, The perpendicular connection line between one shrapnel and the rotation center line of the wind hood forms a 90° angle with the perpendicular connection line between the other shrapnel and the rotation center line of the wind hood.

5. The angle switch structure of the rotary blowing and suction dual-purpose machine according to claim 2, characterized in that, The contact piece is strip-shaped. At least two sections of contact pieces are provided on the wind hood. Two shrapnels are provided on the fuselage. When the wind hood rotates relative to the fuselage to a set angle position, the two shrapnels respectively contact two of the contact pieces. The contact piece has a range for the shrapnel to rotate on it.

6. The angle switch structure of the rotary blowing and suction dual-purpose machine according to claim 2, characterized in that, The fuselage includes a grip and a main housing fixed to the front end of the grip. The wind hood is located below the main housing and is rotatably connected to the main housing. The contact piece is provided on the top surface of the wind hood. A shrapnel for contact and cooperation with the contact piece is provided at the bottom of the main housing.

7. The angle switch structure of the rotary blowing and suction dual-purpose machine according to claim 6, characterized in that, The air inlet and the air outlet are provided on both sides of the wind hood. The opening direction of the air inlet and the opening direction of the air outlet are parallel. The opening direction of the air inlet and the opening direction of the air outlet are both perpendicular to the rotation center line of the wind hood. The air inlet and the air outlet are 180° apart. The air inlet and the air outlet are located on both sides of the rotation center line of the wind hood. When one of the air inlet and the air outlet rotates to have an opening facing forward, the other rotates to have an opening facing backward.

8. The angle switch structure of the rotary blowing and suction dual-purpose machine according to claim 6, characterized in that, A rotating shell for installing a motor is fixed to the top of the wind hood. The main housing covers the rotating shell and is rotatably connected to the rotating shell. A rotation positioning device is provided between the rotating shell and the main housing. The rotation positioning device includes a locking button provided on the main housing and capable of linear movement, a return spring for driving the locking button to move and reset, and three positioning grooves provided on the circumference of the rotating shell. The adjacent two positioning grooves are 90° apart. The locking button is snapped into the positioning groove to lock the relative rotation of the wind hood and the fuselage.

9. The angle switch structure of the rotary blowing and suction dual-purpose machine according to claim 7, characterized in that, When one of the air inlet and the air outlet rotates to have an opening facing forward, the holding center line of the grip is parallel or quasi-parallel to the opening directions of the air inlet and the air outlet.

10. The angle switch structure of the rotary blow-suction dual-purpose machine according to claim 8, characterized in that, A wire groove surrounding the rotating shell is provided on the top of the wind hood. The wire connecting the contact piece is laid in the wire groove.

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