CN2393256Y

CN2393256Y - Dual fan fractional horsepower motor

Info

Publication number: CN2393256Y
Application number: CN 99248551
Authority: CN
Inventors: 郭修圃; 张奇
Original assignee: Electrical Core and Motor Manufacturing Ltd
Current assignee: Electrical Core and Motor Manufacturing Ltd
Priority date: 1999-10-19
Filing date: 1999-10-19
Publication date: 2000-08-23
Anticipated expiration: 2009-10-19

Abstract

A double-fan fractional horsepower motor comprises a stator 1 and a rotor 2, wherein the front end of a rotating shaft of the rotor 2 is provided with a commutator 25, the rear end of the rotating shaft is provided with a transmission worm 21, and the double-fan fractional horsepower motor further comprises a front framework 3, an electric brush mechanism 4, a rear framework 5 and an output shaft worm wheel 6. In particular, an inner fan 22 and an outer fan 23 or 28 are installed in front of and behind the worm gear 21 of the rotor 2, respectively. The inner fan 22 is of axial flow, the outer fan is of either centrifugal 23 or axial 28 type, and may be of either single row or axial 28' type, or a double row, combined fan consisting of two single rows of concentric stacked and bonded fans. The motor has the outstanding advantages of compact structure, high heat dissipation efficiency and high output power, and the motor is forcibly cooled by adopting the inner fan and the outer fan.

Description

The double fan fractional electric motor

The utility model relates to the fractional horsepower general purpose motor that is used for the kitchen electric tool in the motor manufacturing engineering, particularly relates to the small-sized brush motor that two blast fans are housed on rotor.

Prior art is used for the kitchen electric tool, and for example the fractional horsepower general purpose motor of hand-held mixer because power is less, is generally all only in the end held a small fan impeller is installed.Like this, require power output bigger, for example will reach two, three hectowatts, perhaps installing space is narrow especially, and ventilation condition is not so good, and commutator and wiper mechanism service conditions harshness, situations such as carbon dust accumulates easily have only a small fan just relatively to be difficult to meet the demands.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes a kind of fractional horsepower general purpose motor that double fan is installed on rotor shaft, it can instigate air stream that motor rotor, stator and deceleration worm gear are effectively cooled off, and the carbon dust that major part is denuded from brush blows away.

The purpose of this utility model can be by realizing by the following technical solutions: manufacture and design a kind of double fan fractional electric motor, comprise stator 1 and rotor 2, the rotating shaft front end of rotor 2 has commutator 25, there is transmission worm screw 21 rear end, framework 3, wiper mechanism 4, back framework 5 and output shaft worm gear 6 before also comprising.Rotor 2 is positioned at the cavity of stator 1, is the fulcrum rotation with the bearing on front and

back framework

3 and 5, especially, in transmission worm screw 21 front and back of described rotor 2, internal fan 22 and

external fan

23 or 28 is installed respectively.

The drawing of accompanying drawing is described as follows:

Fig. 1 is axonometric projection (solid) figure of the utility model double fan motor overall appearance;

Fig. 2 is the decomposing state schematic diagram of Fig. 1 motor;

Fig. 3 is the overall appearance axonometric projection graph of another embodiment of the utility model motor;

Fig. 4 is the decomposing state schematic diagram of Fig. 3 motor.

Be described in further detail below in conjunction with each most preferred embodiment shown in the accompanying drawing:

Double fan fractional electric motor of the present utility model as shown in Figures 1 to 4, comprises stator 1 and rotor 2, and the rotating shaft front end of rotor 2 has commutator 25, and there is transmission worm screw 21 rear end, framework 3, wiper mechanism 4, back framework 5 and output shaft worm gear 6 before also comprising.Rotor 2 is positioned at the cavity of stator 1, is the fulcrum rotation with the bearing on front and back framework 3 and 5.Especially, transmission worm screw 21 front and back at described rotor 2 are separately installed with internal fan 22 and external fan 23 or 28.Described internal fan 22 is tube-axial fans, comprises wheel hub 221 and blade 222, and blade 222 is the radial peripheral circumferential surface of standing on wheel hub 221, and the plane of each blade 222 or cambered surface are reversed an angle with respect to the central axis of wheel hub 221.This internal fan 22 can directly cool off motor rotor 2, stator 1, and the carbon dust that major part is denuded from the carbon brush of wiper mechanism 4 blows away simultaneously.

The external fan 23 of the utility model motor is installed on the rearmost end of motor, sees Fig. 1, Fig. 2, is centrifugal fan, comprises substrate 231 and blade 232, and the same side that each blade 232 vertically stands on substrate 231 is radial.Described centrifugal fan 23 is used for narrow, the compact conformation in motor mounting space, and the not good occasion of ventilation condition, plays a part to dredge motor peripheral air flow, strengthens the hot-air velocity of discharge, thereby reach the purpose of further cool motors.

The utility model motor can also adopt axial-flow type external fan 28, sees Fig. 3, Fig. 4, and its blade 282 is the radial peripheral circumferential surface of standing on wheel hub 281, and each blade 282 plane or cambered surface are reversed an angle with respect to the central axis of wheel hub 281.The motor power (output) size of can looking described external fan 28 adopt single-row bearing flow fan 28 ', also can with biserial, by the stacked combination fan that is bonded of two single-row bearing flow fans 28 ' with one heart.This fan is used for the motor deceleration worm couple is done efficient cooling, exports the heat that produces when high-power to dispel it, supports wind speed, the flow of internal fan 22 simultaneously, and motor is forced cooling.

For adapting to motor different installation, locate mode in various electric tools, the left and right sides of framework 5 all has two kinds of installation feet 51 and 52 of horizontal cylindrical and horizontal rectangle band manhole simultaneously behind the utility model motor.And above the bearing 55 of described back framework 5 flexible compressing tablet 56, there is the dome shape projection in the central authorities of this compressing tablet 56, respectively there is an aperture on both sides, having one piece of screw to pass through described aperture respectively is fixed on compressing tablet 56 on the framework 5 of back, the dome shape projection inner face of compressing tablet 56 central authorities is pressing the spherical upper surface of bearing 55, makes the bearing 55 can automatic centering.Such structure also can be saved the alloy consumption, reduces manufacturing cost.

Compare with prior art, the outstanding advantages of the utility model motor is, compact conformation, in adopting, Outer two fans are forced cooling to motor simultaneously, and the radiating efficiency high-output power is big.

Claims

1. a double fan fractional electric motor comprises stator (1) and rotor (2), and the rotating shaft front end of rotor (2) has commutator (25), and there is transmission worm screw (21) rear end; Also comprise preceding framework (3), wiper mechanism (4), back framework (5) and output shaft worm gear (6); Rotor (2) is positioned at the cavity of stator (1), is the fulcrum rotation with the bearing on front and back framework (3) and (5), it is characterized in that: before and after the transmission worm screw (21) of described rotor (2), be separately installed with internal fan (22) and external fan (23) or (28).

2. according to the described double fan fractional electric motor of claim 1, it is characterized in that: described internal fan (22) is a tube-axial fan.

3. according to the described double fan fractional electric motor of claim 2, it is characterized in that: described internal fan (22) comprises wheel hub (221) and blade (222), blade (222) is the radial peripheral circumferential surface of standing on wheel hub (221), and the plane of each blade (222) or cambered surface are reversed an angle with respect to the central axis of wheel hub (221).

4. according to the described double fan fractional electric motor of claim 1, it is characterized in that: described external fan (23) is a centrifugal fan.

5. according to the described double fan fractional electric motor of claim 4, it is characterized in that: described external fan (23) comprises substrate (231) and blade (232), and the same side that each blade (232) vertically stands on substrate (231) is radial.

6. according to the described double fan fractional electric motor of claim 1, it is characterized in that: described external fan (28) is a tube-axial fan, its blade (282) is the radial peripheral circumferential surface of standing on wheel hub (281), and the plane of each blade (282) or cambered surface are reversed an angle with respect to the central axis of wheel hub (281).

7. according to the described double fan fractional electric motor of claim 1, it is characterized in that: described external fan (28) can be single-row aerofoil fan (28 '), also can be biserial, by concentric stacked being bonded of two single-row bearing flow fans (28 ').

8. according to the described double fan fractional electric motor of claim 1, it is characterized in that: the left and right sides of described back framework (5) all has two kinds of installation feet (51) and (52) of horizontal cylindrical and horizontal rectangle band manhole simultaneously.

9. according to the described double fan fractional electric motor of claim 1, it is characterized in that: bearing (55) the top flexible compressing tablet (56) of described back framework (5), there is the dome shape projection in the central authorities of this compressing tablet (56), respectively there is an aperture on both sides, have one piece of screw to pass through described aperture respectively compressing tablet (56) is fixed on the back framework (5), the dome shape projection inner face of compressing tablet (56) central authorities is pressing the spherical upper surface of bearing (55).