A kind of self-ventilation asynchronous machine of big fan air-draft-type
The utility model relates to self-ventilated machine, is specially a kind of self-ventilated machine of big fan air-draft-type.
At present, self-ventilation asynchronous machine makes with it favor thus obtain that advantage being simple and easy to safeguard is subject to motor user and generally applies.
Existing self-ventilated machine mostly is centrifugal fan from motor shaft externally air draught, by electric fan, cooling air is blown into motor internal, is taken out of by heat by ventilation hole and air gap from support air outlet.During use, because air inlet is arranged on motor axial end portion border, distance ground is comparatively near, and the foreign matter such as sleet and sandstone is easily inhaled into motor, easily causes the faults such as the aging and ground connection of electrical machine insulation; In addition, electric fan limits by motor structure space, and sectional area is less, causes cooling air quantity less, and cooling effect is slightly poor.
Existing self-ventilated machine generally comprises the stator strip support that an inside is cavity structure, and stator is positioned at base inner incorporating mill seat and is made of one, and rotor is located in the middle of stator core by the level rotating shaft run through before and after stator strip support; Opening is generally made in order to easy to assembly in the rear portion of stator strip support, and opening is fixed with detachable end, can carry out the Installation and Debugging of stator strip base inner equipment like this; Air gap and ventilation slot is provided with for ventilating between stator core and rotor core.
Summary of the invention
The utility model is little for solving existing self-ventilated machine air quantity, easily enters the technical problem of the foreign matter such as sleet and sandstone, provides a kind of self-ventilated machine of big fan air-draft-type.
The utility model realizes by the following technical solutions: a kind of self-ventilation asynchronous machine of big fan air-draft-type, comprises a stator strip support, is located at the middle rotor of the stator core of stator strip support by horizontal rotating shaft; The rear portion of stator strip support is provided with end cap: the position of rotor between its teeth portion and horizontal rotating shaft is provided with some ventilation holes, and the centrifugal fan with rotor coaxial has been installed at the rear of rotor; The stator strip seat top plate of rotor front upper has air inlet, in air inlet, dust filtration device is installed; End cap is provided with multiple air outlet just right with the flabellum of centrifugal fan, and air outlet is provided with protective cover.
Centrifugal fan is fixedly mounted on rotor, when three-phase alternating current connected by motor, fan rotates together along with rotor, local decompression is formed in stator strip base inner, air is entered by the air inlet being positioned at support front upper, through the ventilation hole in rotor core and along the central shaft of flabellum to entering flabellum, flowing out from the radial direction of flabellum and flowing out whole support by the air outlet that end cap is opened, form cooling air duct, effectively achieve the ventilation of motor internal.Ventilation hole is convenient to the cooling-air circulation entered from motor air inlet.Dust filtration device on air inlet can small impurities effectively in filtered air, and dust filtration device can use existing device, as dust cover and other dust filtration equipment.
Self-ventilation asynchronous machine structure described in the utility model is simple, easy I& M, and electric fan sectional area is comparatively large, and air quantity is comparatively large, and cooling effect is better; Its air inlet can be arranged on motor position overhead far away, and protective is good; Solve existing self-ventilated machine air quantity little, easily enter the problem of the foreign matter such as sleet and sandstone, self-ventilated machine structure can be widely used in.
Accompanying drawing explanation
Fig. 1 the utility model structural representation.
1-stator strip support, 2-rotor, 3-centrifugal fan, 4-dust filtration device, 5-end cap, 6-protective cover, 7-horizontal rotating shaft.
A self-ventilation asynchronous machine for big fan air-draft-type, is comprised a stator strip support 1, is located at the middle rotor 2 of the stator core of stator strip support 1 by horizontal rotating shaft 7; The rear portion of stator strip support 1 is provided with end cap 5; The position of rotor 2 between its teeth portion and horizontal rotating shaft 7 is provided with some ventilation holes, and the centrifugal fan 3 coaxial with rotor 2 has been installed at the rear of rotor 2; Stator strip support 1 top board of rotor 2 front upper has air inlet, in air inlet, dust filtration device 4 is installed; End cap 5 is provided with multiple air outlet just right with the flabellum of centrifugal fan 3, and air outlet is provided with protective cover 6.
There is air gap between stator core in stator strip support 1 and rotor core, the ventilation grooved that stator and rotor iron core is arranged is recoil pit; Recoil pit can increase the flow area of cooling air.
In Fig. 1, the right side is front, Zuo Weihou.Air inlet is positioned at the top in rotor front, wind like this after dust filtration device filters is introduced into the front cavity of support, ventilation slot on ventilation hole again in rotor core, rotor and stator and the air gap between rotor and stator arrive the rear cavity of support through rotor and stator, and support is flowed out along the radial air outlet on end cap of fan blade under the effect of centrifugal fan, realize the ventilation of base inner rotor and stator.Centrifugal fan diameter is almost the same large with whole stator strip support intracavity diameter, and intake can reach with very large; Because fan does not need to be arranged on air inlet, therefore the position of air inlet can be arranged relatively flexibly; In figure, air inlet is located at the top of support, avoids entering of the impurity such as sand to greatest extent.Dust filtration device 4 is provided with mounting flange, by installing hole on flange, uses bolt to be arranged on stator by dust filtration device.