Back direct blowing prevention structure of blowing and sucking dual-purpose machine

Abstract

The utility model discloses a back direct blowing prevention structure of a blowing and sucking dual-purpose machine, which comprises a machine body, a fan cover and an air pipe, the machine body comprises a handle and a main machine shell, the fan cover is rotatably connected with the main machine shell, an air inlet and an air outlet are arranged on two sides of the fan cover, the air pipe is detachably connected with the air outlet, and the air pipe comprises a bent pipe or a straight pipe. The opening direction of the air inlet is parallel to the opening direction of the air outlet, a blocking part is arranged at the rear end of the grip, the fan cover can rotate relative to the main machine shell to the position where the opening of the air inlet faces forwards and the opening of the air outlet faces right backwards, and the air outlet is located below the grip at the position. A containing space used for allowing a bent pipe connected to the air outlet to rotate in is formed between the air outlet and the rear blocking part, the overall length of the straight pipe is larger than the width of the containing space, an identification switch is arranged at the air outlet, and when the air pipe is connected to the air outlet, the identification switch is triggered to be switched on, and the bent pipe is driven to rotate. The rear direct blowing of the air outlet caused by misuse can be prevented.

Description

Technical Field

[0001] The utility model relates to a blowing and sucking dual-purpose machine, in particular to a back-direct blowing prevention structure of the blowing and sucking dual-purpose machine. Background Art

[0002] A blower-suction machine primarily consists of a motor, fan blades, housing, nozzle, and air inlet filter. It's commonly used for dust removal on appliances like computers and air conditioners, as well as for outdoor cleaning. The motor's rotation drives the fan blades at high speed, allowing filtered, clean air to enter the machine and build up pressure before being blown out through the nozzle. Existing blower-suction machines already have both blowing and suction functions, with nozzles located in two different locations: the blowing port and the air inlet. The blowing function removes accumulated dust or collects trash, while the suction function draws trash into a collection bag.

[0003] For example, the rechargeable blower-suction blower disclosed in Chinese utility model patent CN204175619U includes a handle, a blower housing, blades, a motor housing, and a motor. The blower housing is fixedly connected to the motor housing, the handle is fixedly connected to the motor housing, a power switch and a speed control switch are mounted on the handle, a battery pack connector is provided at the lower portion of the handle, a quickly detachable battery pack is mounted on the battery pack connector, an upper fixing sleeve and a lower fixing sleeve are provided within the motor housing, the motor sleeve is mounted on the upper and lower fixing sleeves, the blades are fixed to the motor output shaft and rotatably disposed within the blower housing, an outlet port is provided on the blower housing that is snap-connected to the air duct, an air inlet is provided on the blower housing, an air inlet port is provided on the air inlet port that is snap-connected to the air duct, the air inlet port is open to the side, and the direction of the air inlet port is perpendicular to the direction of the air outlet port.

[0004] Since the existing handle and the housing cannot rotate, during actual use, when holding the housing for blowing operation, the blowing port is in front of the hand, which is very convenient and easy to operate. However, when using the suction operation, the air inlet is on the side of the hand, and the handshake method is very awkward. It is often necessary to turn the wrist to complete the vacuuming operation, which is very inconvenient.

[0005] For this purpose, there are rotatable and adjustable blowing and suction machines on the market. The hood for installing the fan blades is rotatable, and the hood is provided with an air inlet and an air outlet. The directions of the air inlet and the air outlet are perpendicular to the rotation direction of the hood. The air inlet and the air outlet are located on both sides of the hood and form an angle of 180°. When the casing is held by hand for blowing, the air outlet rotates to the front side and the air inlet rotates to the back side. When the casing is held by hand for vacuuming, the air inlet rotates to the front side and the air outlet rotates to the back side, making it very convenient to use both the suction and blowing functions.

[0006] However, if the air outlet is rotated to the rear of the hood and the air inlet is rotated to the front, the air outlet will face the person holding the machine from behind. In this state, if the user mistakenly uses the blower-vacuum machine while holding the handle and starts the blower-vacuum machine, there is a risk that foreign objects blown out of the air outlet (such as inhaled pebbles) will hit the user. Utility Model Content

[0007] Since the air outlet is rotated to the rear of the wind hood and the air inlet is rotated to the front, the air outlet will face the person holding the machine from behind. In this state, if the user mistakenly uses the blower-vacuum machine while holding the handle and starts the blower-vacuum machine, there is a risk that foreign objects blown out of the air outlet (such as inhaled pebbles) will hit the user. The utility model provides a structure for preventing direct blowing from behind for the blower-vacuum machine.

[0008] The technical solution adopted by the present invention to solve the above technical problems is as follows: a rear-direct-blowing-proof structure of a dual-purpose blowing and suction machine includes a machine body, a wind cover with an air outlet and an air duct, the machine body includes a handle, and a main shell fixed to the front end of the handle, the wind cover is located below the main shell and is rotatably connected to the main shell, the air outlet includes an air inlet and an air outlet arranged on both sides of the wind cover, the air duct is detachably connected to the air outlet, the air duct includes a curved pipe for changing the direction of the air outlet or a straight pipe for direct blowing, the opening direction of the air inlet is parallel to the opening direction of the air outlet, and the rear end of the handle is provided with a downward protrusion The blocking part of the air hood can be rotated relative to the main casing to a position where the opening of the air inlet faces forward and the opening of the air outlet faces directly rearward. At this position, the air outlet is located below the handle. A accommodating space for the curved pipe connected to the air outlet is formed between the air outlet and the rear blocking part. The overall length of the straight pipe is greater than the width of the accommodating space. An identification switch for identifying whether an air duct is installed on the air outlet is provided at the air outlet. The identification switch is connected to the electrical circuit of the blowing and suction dual-purpose machine. When the air duct is connected to the air outlet, the identification switch is triggered, so that the identification switch is turned on.

[0009] A further preferred technical solution of the present invention is: a mounting portion for mounting a battery pack is provided at the rear end of the handle, and the mounting portion has a slot for detachable sliding insertion of the battery pack. After the battery pack is inserted into the slot, the portion protruding from the lower side of the mounting portion serves as the blocking portion, and the accommodating space is formed between the battery pack and the air outlet that is rotated to open toward the rear.

[0010] A further preferred technical solution of the present invention is: the slot is obliquely arranged at the rear end of the handle for the battery pack to be inserted obliquely, and when the air outlet is rotated to open towards the rear, the direction of insertion of the battery pack forms an obtuse angle with the opening direction of the air outlet.

[0011] A further preferred technical solution of the present invention is: 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 degrees apart, and the air inlet and the air outlet are respectively located on both sides of the rotation center line of the wind hood.

[0012] A further preferred technical solution of the present invention is that the identification switch identifies whether an air duct is installed on the air outlet by means of interference.

[0013] A further preferred technical solution of the present utility model is: the identification switch includes a push rod that can move linearly back and forth, a first return spring that drives the push rod to move and return, and a micro switch arranged on one side of the push rod; the air duct is connected to the air outlet by insertion; when the air duct is inserted into the air outlet, the push rod is pushed so that the push rod presses against the micro switch, triggering the micro switch.

[0014] A further preferred technical solution of the present utility model is: a rotating shell for installing the motor is fixed on 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 movable in a straight line, a second reset spring driving the locking button to move and reset, and three positioning grooves provided in the circumferential direction of the rotating shell, with an angle of 90° between two adjacent positioning grooves, and the locking button is clamped in the positioning groove to lock the relative rotation of the wind hood and the fuselage.

[0015] A further preferred technical solution of the present invention is that a wire groove surrounding the rotating shell is provided on the top of the wind cover, and the wires connected to the identification switch on the fuselage are folded and accommodated in the wire groove for being unfolded or folded during rotation.

[0016] A further preferred technical solution of the present invention is that when one end of the curved pipe is connected to the air outlet, the opening of the other end of the curved pipe faces obliquely downward.

[0017] A further preferred technical solution of the present invention is that when the air outlet is rotated to open toward the rear, the gripping center line of the handle is parallel or quasi-parallel to the opening directions of the air inlet and the air outlet.

[0018] Compared with the prior art, the advantage of the present invention is that an identification switch is provided at the air outlet for identifying whether an air duct is installed on the air outlet. The identification switch is triggered and turned on by the air duct installed on the air outlet. The blowing and sucking dual-purpose machine can be started only after the identification switch is turned on. When the air duct is not installed on the air outlet, the blowing and sucking dual-purpose machine cannot be started, thereby avoiding the air outlet being rotated to the position where the opening faces directly rearward when the air duct is not installed, and preventing the air outlet from blowing directly behind and causing the risk of foreign objects blown out of the air outlet hitting the user.

[0019] When the air outlet is rotated to the rear and the opening is facing directly rearward for vacuuming operation, the air outlet is located below the handle, and an accommodating space for accommodating a curved pipe connected to the air outlet is formed between the air outlet and the downwardly protruding blocking portion at the rear end of the handle. The overall length of the straight pipe is greater than the width of the accommodating space. When the straight pipe is installed on the air outlet, the air outlet is rotated to the rear, and the straight pipe interferes with the blocking portion at the rear, making it impossible for the air outlet to be rotated to the rear position. The straight pipe faces the side and rear, avoiding it from facing the body of the user holding the handle. When the curved pipe is installed on the air outlet, the air outlet can be rotated to the rear position, and the curved pipe changes the direction of the air outlet, avoiding it from facing the body of the user holding the handle, and preventing the air outlet from blowing directly from the rear during improper use, causing the risk of foreign objects blown out of the air outlet hitting the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may contain exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0021] Figure 1 This is a side view of the utility model when the air outlet is rotated to open towards the rear;

[0022] Figure 2 This is a side view of the utility model when the air outlet is rotated to open towards the rear and connected to a curved pipe;

[0023] Figure 3 This is a cross-sectional schematic diagram of the utility model when the air outlet is rotated to face the front;

[0024] Figure 4 This is a state diagram of the air outlet and air inlet of the utility model being rotated to the left and right sides respectively;

[0025] Figure 5 It is a schematic diagram of the connection between the rotating shell and the main shell;

[0026] Figure 6 for Figure 5 A local enlarged view of point A;

[0027] Figure 7 This is a schematic diagram of the structure of the wind shield and rotating shell after the wire pressing plate is disassembled;

[0028] Figure 8 This is a schematic diagram of the pairing of air outlets and air ducts;

[0029] Figure 9 for Figure 8A partial enlarged view of point B;

[0030] Figure 10 Schematic diagram of the air outlet trigger identification switch installed in the air duct;

[0031] Figure 11 This is the state diagram when the straight pipe rotates to the side and rear and interferes with the battery pack;

[0032] Figure 12 Schematic diagram of the straight tube being rotated to the rear to prevent the battery pack from being inserted.

[0033] In the figure: 1. Body; 2. Handle; 3. Grip center line; 4. Main casing; 5. Mounting part; 6. Battery pack; 7. Accommodation space; 8. Air outlet; 9. Wind hood; 10. Air inlet; 11. Bend pipe; 12. Nozzle; 13. Controller; 14. Shift switch; 15. Top cover; 16. Rotating sleeve; 17. Rotating positioning device; 18. Motor; 19. Lower cover; 20. Second air cavity; 21. Second through hole; 23. Middle cover; 24. First air cavity; 25. Impeller; 26. First through hole; 27. Upper cover; 28. Straight pipe; 29. ​​Opening direction of air outlet; 30. Opening direction of air inlet; 31. First outer ring edge; 32. Annular slot; 33. Rotating shell; 34. Locking button; 35. Positioning slot; 36. Second return spring; 37. Wire pressing plate; 38. Plate slot; 39. Guide slot; 40. Electric wire; 41. Wire slot; 42. Rotation center line of the hood; 43. Push rod; 44. Slide rail; 45. Step; 46. Limiting part; 47. Mounting slot; 48. Micro switch; 49. First return spring; 50. Slot; 51. Insertion direction; 52. Bottom opening. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0035] It should be noted that like reference numerals denote like items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0036] Figures 1-12As shown, the anti-rear direct blowing structure of the blower-suction dual-purpose machine includes a body 1, a wind cover 9 with an air outlet, an air duct and an electrical circuit. The body 1 includes a handle 2 and a main casing 4 fixed to the front end of the handle 2. The wind cover 9 is located below the main casing 4 and is rotatably connected to the main casing 4. A controller 13 is fixed to the rear end of the handle 2. The motor 18 is accommodated in the main casing 4 and is electrically connected to the controller 13. The fan wheel 25 is accommodated in the wind cover 9. The air outlet includes an air inlet 10 and an air outlet 8 arranged on the wind cover 9.

[0037] The controller 13 is an existing control circuit board. A power switch is provided on the fuselage 1. The power switch is electrically connected to the controller 13. The power switch is in the above-mentioned electrical circuit. By pressing the power switch to turn it on, the electrical circuit is turned on to start the motor 18. When the motor 18 drives the impeller 25 to rotate in the wind cover 9, an airflow is formed that takes in air from the air inlet 10, passes through the inside of the wind cover 9, and discharges air from the air outlet 8.

[0038] Figure 3 、 Figure 5 、 Figure 7 As shown, a rotating housing 33 for mounting the motor 18 is fixed to the top of the hood 9. The main housing 4 is enclosed by the rotating housing 33 and is rotatably connected to the rotating housing 33. Specifically, the rotating housing 33 is fixed to the top of the hood 9 by screws. An annular groove 32 is provided on the inner wall of the main housing 4, and a first outer ring edge 31 is provided on the outer wall of the rotating housing 33 to cooperate with the annular groove 32. The first outer ring edge 31 is engaged in the annular groove 32 to rotatably connect the main housing 4 and the rotating housing 33 together, thereby rotatably connecting the body 1 and the hood 9.

[0039] The main casing 4 and the handle 2 are integrally formed, and the body 1 includes a left half shell and a right half shell. The left half shell and the right half shell are matched and fixed together by screws. When connected, the left half shell and the right half shell are clamped on both sides of the rotating shell 33 and then fixed with screws, so that the rotating shell 33 is enclosed in the main casing 4 and rotates. A bottom opening 52 is provided at the bottom of the main casing 4 for the rotating shell 33 enclosed in the main casing 4 to be connected to the wind cover 9 below.

[0040] Preferably, the rotating shell 33 includes a rotating sleeve 16 with an upward opening and a top cover 15. The two ends of the rotating sleeve 16 are through-through. The lower end of the rotating sleeve 16 rests on the top of the wind hood 9 and is fixed to the wind hood 9 by screws. The top cover 15 is fixed to the upper end of the rotating sleeve 16 by screws. The top cover 15 and the rotating sleeve 16 enclose a motor cavity for installing the motor 18. The motor 18 is fixed in the motor cavity. A first through hole 26 is provided on the top of the wind hood 9 for the output shaft of the power supply 18 to extend into the wind hood 9 and connect with the impeller 25. The rotation center line of the impeller 25 coincides with the rotation center line 42 of the wind hood.

[0041] Figure 1-Figure 4As shown, the air inlet 10 and the air outlet 8 are respectively arranged on both sides of the wind cover 9, and the opening direction 30 of the air inlet is parallel to the opening direction 29 of the air outlet. When the air inlet 10 rotates to the front side and the air outlet 8 rotates to the rear side, the opening of the air inlet 10 faces the front and the opening of the air outlet 8 faces the rear. The user can hold the handle 2 to perform vacuuming operations. When the air inlet 10 rotates to the rear side and the air outlet 8 rotates to the front side, the opening of the air inlet 10 faces the rear and the opening of the air outlet 8 faces the front. The user can hold the handle 2 to perform blowing operations, so that the air outlet 8 and the air inlet 10 face the front of the blowing and vacuuming dual-purpose machine body during blowing operations or vacuuming operations, making the overall use more convenient. When used for vacuuming operations, the air outlet 8 can rotate to a position directly behind the wind cover 9, and the opening of the air outlet 8 faces directly rearward. At this time, the air outlet 8 is located below the handle 2.

[0042] Preferably, the opening direction 30 of the air inlet and the opening direction 29 of the air outlet are both perpendicular to the rotation center line 42 of the wind hood 9, and the air inlet 10 and the air outlet 8 are 180° apart. The air inlet 10 and the air outlet 8 are located on both sides of the rotation center line 42 of the wind hood. When one of the air inlet 10 and the air outlet 8 rotates to open toward the front, the other air outlet rotates to open toward the rear. At this time, the holding center line 3 of the handle 2 is parallel or quasi-parallel to the opening direction 30 of the air inlet and the opening direction 29 of the air outlet.

[0043] Specifically, it means that when the wind cover 9 rotates to the angular position where the air inlet 10 is located directly in front of it, the air outlet 8 is located directly behind it. At this time, the opening of the air inlet 10 faces directly forward, and the opening of the air outlet 8 faces directly backward. The air outlet 8 located at the rear is below the handle 2. When the wind cover 9 rotates to the angular position where the air inlet 10 is located directly behind it, the air outlet 8 is located directly in front of it. At this time, the opening of the air inlet 10 faces directly backward, and the opening of the air outlet 8 faces directly forward. The air inlet 10 located at the rear is below the handle 2.

[0044] Preferably, extended air nozzles 12 are provided on both sides of the air hood 9, and the air inlet 10 and the air outlet 8 are respectively arranged on the air nozzles 12 on both sides. When the air nozzle 12 rotates the air inlet 10 or the air outlet 8 to the front of the air hood 9, the air inlet 10 or the air outlet 8 is located on the front side of the fuselage 1 for air intake or exhaust.

[0045] Figure 3As shown, preferably, the wind cover 9 includes an upper cover shell 27, an intermediate cover shell 23 and a lower cover shell 19, the upper cover shell 27 is fixedly connected to the upper side of the intermediate cover shell 23 by screws, the upper cover shell 27 and the intermediate cover shell 23 are combined to form a first wind cavity 24 and an air outlet 8 connected to the first wind cavity 24, the wind impeller 25 is arranged in the first wind cavity 24, the wind impeller 25 is a centrifugal fan, the lower cover shell 19 is fixedly connected to the lower side of the intermediate cover shell 23 by screws, and the lower cover shell 19 and the intermediate cover shell 23 are combined to form a first wind cavity 24 and an air outlet 8 connected to the first wind cavity 24. There are two air cavities 20 and an air inlet 10 connected to the second air cavity 20. The intermediate cover shell 23 is provided with a second through hole 21 which is located on the rotation center line of the wind impeller 25 and opposite to the wind impeller 25. The second through hole 21 connects the first air cavity 24 and the second air cavity 20. The second through hole 21 and the air outlet 8 realize axial air intake and radial air outlet of the wind impeller 25. The second air cavity 20 is used to change the air intake direction of the wind cover 9 so that the opening direction 30 of the air inlet can be set to be perpendicular to the rotation center line of the wind impeller 25.

[0046] Figure 5-Figure 7 As shown, a rotation positioning device 17 is provided between the rotating shell 33 and the main shell 4. The rotation positioning device 17 includes a locking button 34 provided on the main shell 4 and movable in a straight line, a second return spring 36 that drives the locking button 34 to move and reset, and three positioning grooves 35 provided on the circumference of the rotating shell 33. There is a 90° angle between two adjacent positioning grooves 35. The locking button 34 is inserted into the positioning groove 35 to lock the relative rotation of the air hood 9 and the fuselage 1. The locking button 34 can be pushed to move and disengage from the positioning groove 35, so that the air hood 9 and the fuselage 1 can be rotated. The air hood 9 is rotated to adjust the angular position of the air inlet 10 and the air outlet 8. After adjustment, the locking button 34 is released, and the second return spring 36 pushes the locking button 34 to move and reset so that the locking button 34 is inserted into the relative positioning groove 35 to lock the rotation.

[0047] The positioning groove 35 is formed by the notch on the first outer ring edge 31 .

[0048] By means of three positioning slots 35 arranged on the circumference of the rotating shell 33, and the gap between two adjacent positioning slots 35 is 90°, the wind hood 9 has three locking positions. The wind hood 9 is rotated 90° to rotate the wind hood 94 from the previous locking position to the next locking position. The three locking positions respectively correspond to the 0° position in which the air inlet 10 is rotated to the front and the opening is facing the front, the 90° position in which the air inlet 10 and the air outlet 8 are facing the left and right sides respectively, and the 180° position in which the air outlet 8 is rotated to the front and the opening is facing the front.

[0049] When the air hood 9 rotates to the 90° position, one of the air inlet 10 and the air outlet 8 rotates to the left and opens to the left, and the other air outlet rotates to the right and opens to the right. This angle position can be used when sideways use is required in a narrow space.

[0050] The air duct is detachably connected to the air outlet 8. Preferably, the air duct is connected to the air outlet 8 by insertion. The connection method between the air duct and the air outlet 8 is the same as that of existing blower-vacuum dual-purpose machines, for example, by inserting the air duct into the air outlet 8 and threading it to the air outlet 8, or by inserting the air duct into the air outlet 8 and snapping it into place, or by referring to the block-detachable assembly described in patent CN204175619U.

[0051] A step 45 is provided on the inner wall of the air nozzle 12 for the air pipe to abut against when inserted.

[0052] Figures 8-10 As shown, the air duct includes a curved pipe 11 for changing the direction of air outlet or a straight pipe 28 for direct blowing. When the air outlet 8 is rotated to the front side for blowing operation, the straight pipe 28 needs to be installed on the air outlet 8. When the air outlet 8 is rotated to the rear side for dust collection operation, the curved pipe 11 needs to be installed on the air outlet 8, and then a dust bag is connected to one end of the outlet of the curved pipe 11.

[0053] Preferably, the curved pipe 11 is bent downward, and when the curved pipe 11 is connected to the air outlet 8, the opening at the other end of the curved pipe 11 faces obliquely downward, directing the wind blown out of the air outlet 8 obliquely downward.

[0054] A downwardly protruding blocking portion is provided at the rear end of the handle 2. When the wind cover 9 is rotated relative to the main housing 4 to a position where the opening of the air inlet 10 faces forward and the opening of the air outlet 8 faces directly rearward, the air outlet 8 is opposite to the blocking portion at the rear, and a receiving space 7 is formed between the air outlet 8 and the blocking portion for the curved pipe 11 connected to the air outlet 8 to be rotated into.

[0055] Figure 11 As shown, the overall length of the straight tube 28 is greater than the width of the accommodating space 7. When the straight tube 28 is installed on the air outlet 8, the air outlet 8 is rotated toward the rear side. The straight tube 28 interferes with the rear blocking portion, preventing the air outlet 8 from rotating to the position directly behind the wind cover 9. The straight tube 28 faces the side and rear, avoiding facing the body of the user holding the handle 2, and preventing the straight tube 28 from accidentally blowing directly at the user when switching from blowing operation to vacuuming operation. Figure 2 As shown, when the air outlet 8 is installed with the curved tube 11, the air outlet 8 can be rotated rearward to a position directly behind the wind shield 9. Since the curved tube 11 changes the direction of the air flow, it prevents the air flow from being directed towards the body of the user holding the handle 2. Even if the air outlet 8 is rotated to a position directly behind the wind shield 9 and is accidentally used, the dust or small stones blown out through the curved tube 11 will not be blown onto the person holding the handle 2 from behind, thus achieving a good protective effect. The width of the accommodating space 7 is assumed to be L1.

[0056] In addition, an identification switch is provided at the air outlet 8 for identifying whether an air duct is installed on the air outlet 8. The identification switch is connected to the electrical circuit. When the air duct is connected to the air outlet 8, the identification switch is triggered and turned on.

[0057] Figures 8-10 As shown, preferably, the identification switch identifies whether an air duct is installed on the air outlet 8 by means of resistance. The identification switch includes a push rod 43 that can move linearly back and forth, a first reset spring 49 that drives the push rod 43 to move and reset, and a micro switch 48 provided on one side of the push rod 43. When the air duct is inserted into the air outlet 8, the push rod 43 is pushed so that the push rod 43 presses against the micro switch 48, triggering the micro switch 48 and turning on the micro switch 48.

[0058] The upper surface of the middle air cover 9 is provided with a mounting groove 47, and the micro switch 48 is installed in the mounting groove 47. The air nozzle 12 provided with the air outlet 8 is provided with a slide rail 44. One end of the slide rail 44 is connected to the mounting groove 47, and the other end of the slide rail 44 is connected to the internal channel of the air nozzle 12 and is opposite to the air outlet 8. The top rod 43 is slidably arranged in the slide rail 44, and one end of the top rod 43 extends out of one end of the slide rail 44 and is opposite to the micro switch 48, and the other end of the top rod 43 extends out of the other end of the slide rail 44. One end of the push rod 43 faces the air outlet 8. A first return spring 49 is installed in the mounting groove 47 to push the push rod 43 toward the air outlet 8 and reset. A limit portion 46 is provided at the end of the push rod 43 facing the micro switch 48. In the initial position, the limit portion 46 is stuck on the inner wall of the mounting groove 47 to limit the push rod 43 from moving forward from the slide rail 44. When the air duct is inserted into the air outlet 8 and connected to the air nozzle 12, the air duct pushes the push rod 43 inward so that the push rod 43 presses against the micro switch 48, triggering the micro switch 48. The limit portion 46 can be formed by bending the end of the push rod 43 near the micro switch 48.

[0059] After the identification switch is turned on, the user can press the power switch to connect the entire electrical circuit, start the motor 18, and the blower-suction machine will start working. The blower-suction machine can only be started after the identification switch is turned on. The blower-suction machine can only be started when the air duct is installed on the air outlet 8. If the air duct is not installed on the air outlet 8, the blower-suction machine cannot be started. This prevents the air outlet 8 from being rotated to the position where the opening faces directly backward without the air duct being installed, thereby preventing the air outlet 8 from blowing directly from the back and causing foreign objects blown out of the air outlet 8 to hit the user.

[0060] Preferably, the rear end of the handle 2 is provided with a mounting portion 5 for mounting a battery pack 6, and the mounting portion 5 has a slot 50 for detachable sliding insertion of the battery pack 6. After the battery pack 6 is inserted into the slot 50, it protrudes from the lower side of the mounting portion 5 and serves as a blocking portion. A accommodating space 7 is formed between the battery pack 6 and the air outlet 8 that is rotated to open toward the rear.

[0061] Specifically, the slot 50 is obliquely arranged at the rear end of the handle 2 for the battery pack 6 to be inserted obliquely. When the air outlet 8 is rotated to open toward the rear, the insertion direction 51 of the battery pack 6 has an angle with the opening direction 29 of the air outlet. Let the angle be α, which is an obtuse angle.

[0062] Figure 12 As shown, the battery pack 6 serves as the above-mentioned blocking portion. When the straight tube 28 is installed on the air outlet 8 and the air outlet 8 is rotated to face the rear, the battery pack 6 cannot be normally inserted into the slot 50 due to the obstruction of the straight tube 28, so that the battery pack 6 cannot power the blower-vacuum machine, and the blower-vacuum machine cannot be started, thereby preventing the user from accidentally using the air outlet 8 equipped with the straight tube 28 when it is rotated to face the rear, thereby achieving a multiple insurance effect.

[0063] The battery pack 6 is installed on the slot 50 to power the blower-suction machine. The installation method of the battery pack 6 inserted into the slot 50 is a conventional installation method on existing power tools. Please refer to the structure of the battery pack 6 installation in patent CN206017082U.

[0064] A wire groove 41 is provided on the top of the wind shield 9 and surrounds the periphery of the rotating shell 33. The wire 40 connected to the identification switch on the fuselage 1 is folded and accommodated in the wire groove 41 for unfolding or folding when rotating.

[0065] Figure 3 、 Figure 7 As shown, specifically, the micro switch 48 is connected to the shift switch 14 provided on the fuselage 1 through the wire 40, and the shift switch 14 is connected to the controller 13 through the wire 40. The wire 40 connected from the shift switch 14 passes through the upper cover 27 and is connected to the micro switch 48 in the mounting groove 47. The above-mentioned wire groove 41 is provided on the top surface of the upper cover 27. The top surface of the upper cover 27 is also provided with a plate groove 38 located outside the wire groove 41 and connected to the wire groove 41. The bottom of the plate groove 38 is provided with a guide groove 39, one end of the guide groove 39 is connected to the wire groove 41, and the other end of the guide groove 39 is provided with a wire threading hole connected to the mounting groove 47. The wire 40 is guided by the guide groove 39 and passes through the wire threading hole to be connected to the micro switch 48 in the mounting groove 47. A wire pressing plate 37 is connected with a buckle on the plate groove 38, and the wire pressing plate 37 covers the plate groove 38.

[0066] The above describes the back-blow protection structure of the blower-suction dual-purpose machine provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are intended only to facilitate understanding of the present invention and its core concept. It should be noted that those skilled in the art may, without departing from the principles of the present invention, make various improvements and modifications to the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A structure for preventing back direct blowing of a dual-purpose blower and vacuum cleaner, comprising a body, a hood with an air outlet, and an air duct. The body comprises a handle and a main housing fixed to the front end of the handle. The hood is located below the main housing and is rotatably connected to the main housing. The air outlet comprises an air inlet and an air outlet arranged on both sides of the hood. The air duct is detachably connected to the air outlet. The air duct comprises a curved pipe for changing the air outlet direction or a straight pipe for direct blowing. The invention is characterized in that: The opening direction of the air inlet is parallel to the opening direction of the air outlet, and the rear end of the handle is provided with a downwardly protruding blocking portion. The wind cover can be rotated relative to the main casing to a position where the opening of the air inlet faces forward and the opening of the air outlet faces directly rearward. At this position, the air outlet is located below the handle, and a accommodating space for the curved pipe connected to the air outlet to be turned into is formed between the air outlet and the rear blocking portion. The overall length of the straight pipe is greater than the width of the accommodating space. An identification switch is provided at the air outlet for identifying whether an air duct is installed on the air outlet. The identification switch is connected to the electrical circuit of the blowing and suction dual-purpose machine. When the air duct is connected to the air outlet, the identification switch is triggered, so that the identification switch is turned on.

2. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 1 is characterized in that: The rear end of the handle is provided with a mounting portion for installing a battery pack, and the mounting portion has a slot for detachable sliding insertion of the battery pack. After the battery pack is inserted into the slot, the portion protruding from the lower side of the mounting portion serves as the blocking portion, and the accommodating space is formed between the battery pack and the air outlet that is rotated to open toward the rear.

3. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 2 is characterized in that: The slot is obliquely arranged at the rear end of the handle for the battery pack to be obliquely inserted. When the air outlet is rotated to open toward the rear, the direction of insertion of the battery pack forms an obtuse angle with the direction of the opening of the air outlet.

4. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 1 is characterized in that: The opening directions of the air inlet and the air outlet are both perpendicular to the rotation center line of the wind hood, the air inlet and the air outlet are 180 degrees apart, and the air inlet and the air outlet are respectively located on both sides of the rotation center line of the wind hood.

5. The back-direct blowing prevention structure of the blower-suction dual-purpose machine according to claim 1 is characterized in that: The identification switch identifies whether an air duct is installed on the air outlet by means of resistance.

6. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 5, characterized in that: The identification switch includes a push rod that can move linearly back and forth, a first return spring that drives the push rod to move and return, and a micro switch arranged on one side of the push rod. The air duct is connected to the air outlet by insertion. When the air duct is inserted into the air outlet, the push rod is pushed so that the push rod presses against the micro switch, triggering the micro switch.

7. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 1 is characterized in that: A rotating shell for installing the motor is fixed on the top of the wind hood, and the main shell 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 shell. The rotation positioning device includes a locking button provided on the main shell and movable in a straight line, a second return spring driving the locking button to move and return, and three positioning grooves provided in the circumference of the rotating shell, with an angle of 90° between two adjacent positioning grooves. The locking button is inserted into the positioning groove to lock the relative rotation of the wind hood and the fuselage.

8. The back-direct blowing prevention structure of the blower-suction dual-purpose machine according to claim 7 is characterized in that: A wire groove surrounding the rotating shell is provided on the top of the wind cover. The wires connected to the identification switch on the fuselage are folded and accommodated in the wire groove so as to be unfolded or folded during rotation.

9. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 1, characterized in that: When one end of the curved pipe is connected to the air outlet, the opening of the other end of the curved pipe faces obliquely downward.

10. The back-blow prevention structure of the blower-suction dual-purpose machine according to claim 1, characterized in that: When the air outlet is rotated to open toward the rear, the gripping center line of the handle is parallel or quasi-parallel to the opening directions of the air inlet and the air outlet.

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