Patent Publication Number: US-10788043-B2

Title: Blower fan

Description:
FIELD OF TECHNOLOGY 
     The present invention relates to the technical field of blower fan and, more particularly, to a blower fan with adjustable air blowing angle. 
     BACKGROUND 
     A blower fan is a machine which sucks air into the machine from the outside through an air inlet and then blows it out from an air outlet. A blower fan generally has a volute-shaped body, with an air outlet close to the ground; the body is provided with foot-pads and therefore the machine can be placed on the ground to dry a wet place. A traditional blower fan has a body formed integrally and the angle of its air outlet is fixed; however, in use, the air blowing angle often needs to be adjusted to achieve a better drying effect. 
     A traditional blower fan with an adjustable air blowing angle comprises two side walls, an air duct, a handle and a motor, wherein the air duct is arranged between two side walls in a rotatable way; however, the handle is mounted on the two side walls, which will hinder the rotating of the air duct; in order to ensure the rotation of the air duct, it is necessary to increase the size of the blower fan, thus increasing the transport and storage costs. In addition, since the weight of the blower fan is mainly caused by the air duct and the handle is mounted on the side walls, when the blower fan is lifted up, the joints between the side walls and the air duct are likely to be damaged due to an excessive stress. 
     SUMMARY 
     Therefore, the present invention is intended to provide a blower fan which has an adjustable air blowing angle to achieve a better drying effect and in addition is compact in structure, attractive in appearance and durable. 
     The object of the present invention is achieved by the following technical solution: a blower fan comprising two side walls, an air duct, a handle, a motor, a wind wheel and a motor control assembly; the two side walls are arranged in parallel with each other; the air duct is arranged between the two side walls in a rotatable way; the handle is mounted on the air duct; the motor and the wind wheel are both mounted in the air duct; the motor control assembly is arranged on a side wall close to the motor, and the installation position of the motor control assembly with respect to the side wall is at an inner side of the side wall; and the motor control assembly is electrically connected with the motor. 
     Further, the side wall on which the motor control assembly is arranged is provided with a hollow portion, and the motor control assembly runs through the hollow portion and then protrudes from an outer side of the side wall. 
     Further, the two side walls are each composed of a support frame and a fixing frame, and the fixing frame is located above the support frame. 
     Further, the air duct is of a hollow volute shape, and at least one side of the air duct is provided with an air inlet, and an air outlet is arranged at the front end of the air duct; and the motor is fixed to an inner side wall of the air inlet of the air duct. 
     Further, at least one of the two side walls is provided with a plurality of detents, and the air duct is provided with a positioning mechanism corresponding to the detents. 
     Further, the plurality of detents are arranged at equal intervals to make a circle. 
     Further, the plurality of detents are arranged at an interval of between 5 and 20 degrees. 
     Further, the wind wheel comprises at least one set of fan blades. 
     Further, the motor control assembly comprises a control switch, an auxiliary power outlet and a circuit protection device, the control switch is electrically connected to the motor, and the circuit protection device is electrically connected to the auxiliary power outlet. 
     Further, the blower fan further comprises a bottom base, and the bottom base is connected to the two side walls. 
     Compared with the prior art, the present invention has the following advantages: firstly, the air duct can rotate in a direction perpendicular to the side walls so as to realize the adjustable air blowing angle to meet the demand of the user for different air blowing angles and achieve a better drying effect; secondly, the motor control assembly runs through one of the side walls, connected from the inner side of the side wall and protruding from the outer side of the side wall, and thus the motor control assembly is convenient to mount and detach and does not affect the aesthetics; thirdly, Since the handle is arranged on the air duct, the rotation of the air duct is not limited by the distance between the handle and the air duct, thus ensuring more compact overall structure of the blower fan; additionally, since the weight of the blower fan is mostly caused by the air duct and the motor and the motor of the present invention is installed in the air duct, the handle is arranged on the air duct so that the joints between the side walls and the air duct can be prevented from being damaged by an excessive stress. 
     For better understanding and implementation, a detailed description of the invention is given with accompanying drawings as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a left side perspective view of a blower fan according to an embodiment. 
         FIG. 2  is a right side perspective view of the blower fan according to the embodiment. 
         FIG. 3  is an exploded perspective view of the blower fan according to the embodiment. 
         FIG. 4  is an exploded perspective view of a partial structure in another aspect of the blower fan according to the embodiment. 
         FIG. 5  is a schematic diagram showing the change of the air blowing angle of an air duct of the blower fan according to the embodiment. 
         FIG. 6  is a schematic diagram showing the internal structure of a control component of the blower fan according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The present invention will be described below in further detail with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the orientations or positional relationships, indicated by the terms “center”, “longitudinal”, “lateral”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside” and the like, are based on the orientations or positional relationships shown in the drawings and are only for the purpose of facilitating and simplifying the description of the present invention, rather than indicating or implying that the described device or element must have a particular orientation or must be constructed and operated in a particular orientation, and therefore they cannot to be construed as limiting the present invention. In the description of the present invention, the meaning of “a plurality of” is two or more, unless otherwise specified. 
       FIGS. 1, 2, 3, and 4  which respectively are the left side perspective view, the right side perspective view, the exploded perspective view, and the exploded perspective view of a partial structure in another aspect of the blower fan of this embodiment are further referred to. The blower fan according to this embodiment comprises a first side wall  110 , a second side wall  120 , an air duct  200 , a motor  300 , a motor control assembly  400 , a handle  500 , and a bottom base  600 . 
     The first side wall  110  and the second side wall  120  are arranged in parallel with each other. Specifically, the first side wall  110  consists of a lower first support frame  111  and a upper first fixing frame  112 , and in this embodiment, the first fixing frame  112  is of an annular shape, with a plurality of clamping slots  1121  along its circumferential direction. The second side wall  120  consists of a lower second support frame  121  and a upper second fixing frame  122 . In this embodiment, the second fixing frame  112  is of an annular shape, with a plurality of clamping grooves  1221  uniformly arranged at the inner side in its circumferential direction and a plurality of detents  1222  uniformly arranged at the outer side in its circumferential direction, and the interval radian of the plurality of detents  1222  is preferably 10 degrees. 
     The air duct  200  is disposed between the first side wall  110  and the second side wall  120  in a rotatable way and the direction of its rotation axis is perpendicular to the first side wall  110  and the second side wall  120 . In this embodiment, the air duct  200  is of a hollow volute shape. An air outlet  210  is arranged at the front end of the air duct  200 . Specifically, the air outlet  210  is rectangular and is provided with a grille  211  for assisting the control of air at the outlet and for preventing the external object from entering the air duct. The grille  211  may be fixedly mounted at the air outlet  210  or may be adjusted in a horizontal or vertical direction so that air at the outlet can be changed in accordance with the use demand. 
     The side faces of the air duct  200  are arranged in parallel with the first side wall  110  and the second side wall  120 , and the air duct  200  is detachably connected to the second side wall  120 . Specifically, a positioning groove  220  is formed at the periphery of the side face, in the vicinity of the second side wall  120 , of the air duct  200 , and the positioning groove  220  correspond to the plurality of detents  1222  on the second side wall  120 . One of the detents  1222  can be connected to the positioning groove  220  by a fastener  810  so as to stabilize the position of the air duct  200 . When the position of the air duct  200  needs to be changed, the air duct  200  is rotated to a desired position along the rotation axis, and at this moment, the positioning groove  220  corresponds to another detent  1222 , and then the another detent  1222  is connected with the positioning groove  220  through the fastener  810  to stabilize the air duct  200 . With reference to  FIG. 5  which is a schematic diagram showing the change of the air blowing angle of the air duct of the blower fan according to the embodiment, the air duct  200  is rotatable through about 240 degrees. 
     The side face, in the vicinity of the second side wall  120 , of the air duct  200  is also connected to an air intake component  700 . The air intake component  700  is a circular housing with a second inlet  710  in the surface, the second inlet  710  is provided with a protective net which is used for preventing the external object from entering the air duct. The outer circumference of the circular housing is uniformly provided with mounting grooves  720  which correspond to the clamping grooves  1221  in the second side wall  120 . The air intake component  700  is connected to the second side wall  120  through a fastener  820 . In this embodiment, the fastener  820  is a screw. 
     The handle  500  is arranged on the air duct  200  and rotates together with the air duct  200 . The blower fan can be lifted up and moved more conveniently due to arrangement of the handle  500 . The handle  500  is arranged on the air duct  200  so that the handle  500  can rotate together with the air duct  200 ; therefore, the rotation of the air duct  200  is not limited by the distance between the handle  500  and the air duct  200 , and the distance between the handle  500  and the air duct  200  just need to ensure that the hand of a user can pass, so that the overall structure can be more compact, thus saving the space. In addition, since the weight of the blower fan is mainly caused by the air duct  200 , the handle  500  is arranged on the air duct  200  so that the joints between the side walls and the air duct are prevented from being damaged due to an excessive stress. 
     The bottom base  600  is located below the air duct  200  and the two sides of the bottom base  600  are respectively connected to the first support frame  111  at the bottom of the first side wall  110  and the second support frame  121  at the bottom of the second side wall  120 . The distance between the bottom base  600  and the air duct  200  can ensure that the air duct  200  will not come into contact with the bottom base  600  when the air duct  200  is rotated. 
     The motor  300  is installed in the air duct  200 . Specifically, the motor  300  is fixed to the inner side wall of the air duct  200  by a fastener  830 , and rotates together with the air duct  200 . The motor  300  is connected to a wind wheel  310  which comprises a first set of blade  311  and a second set of blade  312 , being close to the first side wall  110  and the second side wall  120 , respectively. 
     The motor control assembly  400  is arranged on the first side wall  110  and is electrically connected to the motor  300 . In particular, the motor control assembly  400  comprises a control panel  410  having a semi-encircled shape to form an interior space into which a portion of the motor  300  is supported. In this embodiment, the outer periphery of the control panel  410  is circular and the edge thereof is uniformly provided with a plurality of protrusions  411 . The protrusions  411  are matched with the clamping slots  1121  of the first fixing frame  112  of the first side wall  110 , and thus the control panel  410  is fixed to the inside of the first fixing frame  112  and protrudes from the outside of the first fixing frame  112 . In addition, the control panel  410  is further provided with a first air inlet  412  which is shaped like a long strip. 
     The motor control assembly  400  further comprises a control switch  420 , an auxiliary power outlet  430 , and a circuit protection device  440  mounted on the control panel  410 . With reference to  FIG. 6 , which is a schematic diagram showing the internal structure of the motor control assembly  400  of the blower fan according to the embodiment. In this embodiment, the control switch  420  is a multi-position rotary switch, and is electrically connected to the motor  300  to control its operation. The circuit protection device  440  is a circuit breaker and is electrically connected to the auxiliary power outlet  430 . The circuit protection device  440  is used to cut off a power source to protect a circuit when the circuit has a failure. 
     In the present embodiment, a portion of outside air enters the wind wheel  310  through the first air inlet  412  and gets close to the first set of blade  311 ; another portion of outside air enters the wind turbine  310  through the second air inlet  710  and gets close to the second set of blade  312 . The motor  300  drives the wind wheel  310  to rotate, and the air generated by the first set of blade  311  and the second set of blade  312  is discharged through the air outlet  210 . 
     Compared with the prior art, the present invention has the following advantages: firstly, the air duct can rotate in a direction perpendicular to the side walls so as to realize the adjustable air blowing angle to meet the demand of the user for different air blowing angles and achieve a better drying effect; secondly, the motor control assembly runs through one of the side walls, connected from the inner side of the side wall and protruding from the outer side of the side wall, and thus the motor control assembly is convenient to mount and detach and does not affect the aesthetics; thirdly, Since the handle is arranged on the air duct, the rotation of the air duct is not limited by the distance between the handle and the air duct, thus ensuring more compact overall structure of the blower fan; additionally, since the weight of the blower fan is mostly caused by the air duct and the motor and the motor of the present invention is installed in the air duct, the handle is arranged on the air duct so that the joints between the side walls and the air duct can be prevented from being damaged by an excessive stress. 
     The above-described embodiment shows only one embodiment of the present invention, which is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that various variants and improvements can be made by those skilled in the art without departing from the spirit of the invention and all these variants and improvements fall within the scope of the present invention.