JPS5949780B2 - Electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor suitable for use in electrical equipment that uses commercial power, such as vacuum cleaners and juicers.

Traditionally, electrical equipment that uses commercial power supplies has a cord reel device installed inside the main body to store the power cord within the main body. In this case, the electric motor and cord reel must be arranged in series.
There is a problem that the axial length becomes large and the main body becomes large.

The present invention has been made in view of these points, and can be made compact even if a cord reel is attached, and the cord reel can provide soundproofing as well as air guidance. The purpose of this invention is to obtain an electric motor that can also cool the cord.

The present invention is characterized in that a cord reel body is rotatably attached to the outer periphery of an electric part provided with a cooling fan while forming a ventilation path between the outer periphery and the outer periphery of the electric part.

Therefore, the wind generated by the cooling fan is guided by the ventilation path formed by the electric part and the cord reel body and is effectively exhausted, thereby cooling not only the electric part but also the cord reel body. If a through hole is formed in the reel of the cord reel body, cooling air that comes into direct contact with the power cord will be generated, effectively cooling the power cord. Because of its position, it also exhibits a soundproofing effect, and in particular, since the overall length of the motorized part does not have to be extended, it can be made smaller overall, and the cord reel itself can be installed without play. It is composed of

A first embodiment of the present invention will be described based on FIG.

A motorized part 2 is provided inside a frame 1 formed into a cylindrical shape with a bottom and a one-way opening.

That is, this electric part 2 consists of a stator 3 fixed to the frame 1 and a rotor 4 located inside the stator 3, and the rotor 4 is fixed to a shaft 7 held at both ends by bearings 5 and 6. There is.

A commutator 8 is fixed to the shaft 7, and a brush 10 held by a brush holder 9 fixed to the frame 1 is pressed against the commutator 8 by being biased by a spring 11.

These brushes 10 are electrically connected to contacts 13 provided on the brush holder 9 in a direction perpendicular to the brushes 10 and biased by a spring 12.

Further, one of the bearings 5 that holds the shaft 7 is housed in a protrusion 14 formed in the frame 1.

A blower 16 serving as a cooling fan is fixed to the flange 15 of the frame 1 with rivets.

This blower 16 has a base 1 that holds the bearing 6.
7 and this base 17 is connected at the outer periphery and has a ventilation hole 1 in the center.
8 and a cover 19 formed with these bases 1
A fan 20 is fixed to the end of the shaft 7 in an internal space defined by the shaft 7 and the cover 19.

The air guide plate 21 installed along the fan 20 and the base 17 have through holes 21a, 21b and through holes 17a, 17.
b is formed, and the wind generated by the fan 20 is sent out to the outside air through the through holes 21a and 17a, and
b, 17b into the electric part 2.

The stator 3 of this electric part 2 has a notch (not shown) in its circumferential direction, and has sufficient ventilation space in the axial direction.

A notch 22 is formed in the frame 1 for discharging the wind that has passed through the electric part 2 (the shape of the frame before the notch is formed is shown by a chain line).

Next, a bottomed cylindrical cord reel body 23 is provided at a predetermined distance from the outer periphery of the electric motor part 2, that is, the outer circumferential surface 2a of the frame 1, and forms a ventilation passage 2b.

The cord reel body 23 includes a reel 26 having flanges 24 on both sides and for winding and holding a power cord 25, and a bottom portion 27 formed integrally with the reel 26.

The bottom of the reel 26 has a plurality of through holes 26 that serve as ventilation holes.
a is formed.

The center portion of the bottom portion 27 is fitted and held by a shaft 28 that is fitted and fixed to the outer circumferential side of the punched portion 14, and a ring-shaped sliding contact 29 that connects with the contact 13 is provided on the side surface thereof. It is being

These sliding contacts 29 are connected to the power cord 25, respectively.

A ventilation hole 23 is provided on one side of the cord reel body 23.
a is formed.

Further, a return spring device 30 is fixed to the side of the cord reel body 23 by elastic legs 31.

At the center of the base 32 of this return spring device 30 is an intermediate shaft 33.
is provided through the shaft 28, and the side plate 34 located at the outer end and the intermediate shaft 33 are fixed to the shaft body 28 with fixing screws 35.

One end of a mainspring spring 36 is fixed to the spacer shaft 33 with a screw 37, and the other end of the mainspring spring 36 is fixed to the base 32.

Further, the side plate 34 is provided with a brake arm 39 which is interlocked with the knob 38, and a roller 40 attached to the tip 1 of the brake arm 39 is joined to the inner circumferential surface of the base 32.

Further, a presser 41 partially fixed in the circumferential direction of the frame 1 is connected near the end of the inner circumferential surface of the cord reel body 23 on the side of the blower 16 to prevent the cord reel body 2θ3 from falling. It is prevented.

In such a configuration, the outer diameter of the frame 1 of the electric part 2 is smaller than the outer diameter of the blower 16, and therefore,
The outer diameter of the cord reel body 23 disposed on the outer periphery of the electric part 2 is almost the same as that of the blower 16.

Therefore, even though the cord reel body 23 is provided, the overall length hardly increases, and the dead space around the outer periphery of the motorized part 2 is utilized very effectively.

Further, even if the return spring device 30 is connected to the cord reel body 23 and the automatic winding 7 type is used, the length in the axial direction of the return spring device 30 may be short, so there is almost no effect on downsizing.

Further, since the electric part 2 that generates the largest amount of noise is covered with the cord reel body 23, internal noise is blocked.

The wind from the blower 16 passes through the ventilation path 2b and is discharged from the ventilation hole 23a, where it is rectified and the exhaust noise is also reduced.

In particular, since the air is also exhausted from the through hole 26a formed in the reel 26, the air is dispersed in this area, reducing the speed of the exhaust flow and further reducing the exhaust noise.

In addition, since the cord reel body 23 is always in contact with the exhaust air, its cooling is performed smoothly.
The wind from the through hole 26a directly cools the power cord 25 to prevent the temperature from rising.

Next, a second embodiment of the present invention will be described based on FIG.

Frames 44 and 45 are provided individually with fixing screws 43 to hold the stator 42, and these frames 44.
A rotor '49 is provided on a shaft 48 supported by bearings 46 and 47 held in the frame 45, and a fan 50 serving as a cooling fan is fixed to the side of the frame 45, and a commutator 51 is fixed to the other side. ing.

A brush 53 held by a brush holder 52 fixed to the frame 44 is urged by a spring 54 and pressed into contact with the commutator 51 .

The brush holder 52 is attached to the rib 44a of the frame 44.
A through hole 44b through which exhaust air passes is formed around the rib 44a.

A ventilation passage 2b is provided between the outer periphery of the electric motor part 55 formed in this way, that is, the outer peripheral surface 2a of the frame 44.45.
A cord reel body 56 is rotatably attached while forming a cord.

This cord reel body 56 winds and holds a power cord 57, and has two conductive rings 58 and 59 on its inner circumference.
The power cord 57 is connected to these conductive rings 58 and 59, and a current collecting brush 60 held by the brush holder 52 is urged by a spring 61 and pressed into contact with each of the conductive rings 58 and 59. ing.

Further, a plurality of through holes 26a serving as ventilation holes are formed.

Next, a ventilation hole 62 is formed in the cord reel body 56, and a barrel case 63 is fixed to the end thereof.

One end of a mainspring spring 64 is coupled to the inner circumference of the barrel case 63, and the other end of the mainspring spring 64 is fixed to the frame 44 with a fixing screw 65.

In such a configuration, the cord reel body 56 is supported by the frames 44, 45 of the electric part 55 and rotates with little play, thereby rewinding and winding the power cord 57.

Therefore, the frames 44, 45 are connected to the cord reel body 56.
It is the axis of

Further, the air generated by the fan 50 is sucked through the opening 66 formed in the frame 45, passes through the inside of the electric part 55, passes through the ventilation hole 44b formed in the frame 44 and the ventilation path 2b, and then passes through the ventilation hole 62. It is discharged to the outside.

Therefore, the cord reel body 56 also functions as a wind guide tube, and since it covers the outer periphery of the electric part 55, it also functions as a soundproof tube.

Moreover, electrical connection to the motorized part 55 can be made very easily at its inner circumference.

Note that the direction in which the cooling air is passed may be opposite to the direction in each of the embodiments described above.

In the present invention, as described above, the cord reel body is disposed and rotatably held on the axis while forming a ventilation path between it and the electric part, so the cord reel body can be moved without increasing the length of the electric part. This allows devices such as vacuum cleaners and juicers to be made smaller, and the air from the cooling fan passes through the ventilation path formed by the cord reel, so it is rectified. It does not generate noise and can effectively cool the cord reel. In particular, the power cord is also directly cooled by the wind passing through the holes formed in the reel, preventing a temperature rise. Alternatively, it has the effect of being able to prevent noise from being sucked in.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a first embodiment of the invention, and FIG. 2 is a partially cutaway side view showing a second embodiment of the invention. 2...Electric part, 2a...Outer peripheral surface, 2b
...Ventilation duct, 16...Blower (cooling fan), 23...Cord reel body, 26...
...Reel, 26a...Through hole, 50...
...Fan (cooling fan), 55...Electric part.

Claims (1)

[Claims of Claims] 1. A cord reel body is rotatably mounted by providing an electric part that allows air from a cooling fan to pass through the inside, and forming a ventilation path between the electric part and the outer peripheral surface of the electric part. electric motor. 2. A motorized section for passing the air from the cooling fan inside is provided, a ventilation path is formed between the motorized section and the outer peripheral surface, and a cord reel body is rotatably attached to the shaft, and a plurality of reels are mounted on the reel of the cord reel body. An electric motor characterized by forming a ventilation hole.