Air cooling equipment in direct current machine is forcedTechnical field
The present invention relates to the heat dissipation problem of direct current machine, a kind of air blast cooling radiator cooler of direct current machine specifically, solve the work heat dissipation problem of direct current machine under mal-condition by the method that increases an axle head cooling fan, to guarantee the reliable and stable of machine operation.
Background technology
Direct current machine winding when work can produce heat, and this heat is directly proportional with working strength, must in time be loose but, otherwise the operating efficiency of motor is reduced rapidly, also can burn winding when serious and damage motor.
The heat radiation of existing direct current machine comprises following several method: 1, Natural Heat Convection.The heat that produces when utilizing cross-ventilation with machine operation is taken away.This is a kind of method commonly used, generally do not increase servicing unit, only rely on motor housing (some is added with the rib that increases surface area at shell) and cross-ventilation heat radiation, to the requirement of heat radiation, also be not suitable for using in the space of small space and ventilation condition difference in the time of can not satisfying the motor intensive work; 2, coaxial fan heat radiation.At the axle flabellum that is connected of rotor one end, axially drive the air fluxion strap when utilizing rotor to rotate and walk heat energy.Flabellum and two kinds of forms of outer flabellum in comprising, interior flabellum air flows through the space between rotor and stator, is fit to the internal rotor permanent-magnetic direct current machine.Outer flabellum cooperates a kuppe, and air flows through the motor housing surface, and suitable winding is fixed on the inner-rotor brushless direct current machine on the shell.This method is cooling blast flow and the inversely proportional relation of load under the big load slow-speed of revolution of motor situation, can not provide effective heat radiation substantially; 3, incorporated fan heat radiation.Dispel the heat at the additional electric fan of the fin of motor housing.Be usually used in the motor high load working condition, can solve the heat dissipation problem in the improper ventilation environment, be applicable to that winding is fixed on the inner-rotor brushless direct current machine on the shell; 4, water jacket heat radiation.Increase a water jacket, the heat energy when utilizing current to take away machine operation on the motor housing surface.The scope of application is less, and the inner-rotor brushless direct current machine of only working in the environment of abundant water has the use meaning.
Summary of the invention
The present invention will solve is the inner rotor type DC motor existing above-mentioned deficiency of heat radiation of working in the little space of high strength, provide a kind of and can adapt to the air blast cooling device that the motor intensive work can be satisfied little space ventilator again, the inner rotor type DC motor that this system is housed can be implemented in the interior high strength continuous operation of small space, and overheated problem of burning motor can not occur.Force the cooled rotor winding by additional electric fan outside the rear end cap of existing internal rotor direct current machine specifically, can realize the proportional relation of amount of cooling water and load, avoid motor the overheated phenomenon of burning under high load working condition, to occur.
The technical solution that realizes the object of the invention is: air cooling equipment in a kind of direct current machine is forced comprises aeration type front end housing, bridge rectifier, electric fan, hold-down screw, flexible seals, aeration type rear end cap and direct current machine; The aeration type front end housing is installed on the output axle head of direct current machine, bridge rectifier is fixed in the inboard of the aeration type rear end cap of direct current machine, electric fan is installed in the aeration type rear end cap outside by hold-down screw, is shaped on ventilation hole on aeration type front end housing and the aeration type rear end cap.
The bridge rectifier of described electric fan by being fixed in aeration type rear end cap inboard obtains electric energy from the brush of direct current machine.
The ac input end of described bridge rectifier is connected on the brush of direct current machine, and the dc output end of bridge rectifier connects electric fan.
Described electric fan and aeration type rear end cap fit flexible seals partly are housed.
Described electric fan adopts tube-axial fan or centrifugal fan.
The present invention compared with prior art, its remarkable advantage: the heat dissipation problem when 1, having solved the big load operation of internal rotor DC motor rotor winding more completely; 2, has the cooling effect that is directly proportional with load; 3, applicable to various forms of direct current machines, and has the air quantity adaptive adjustment capability.
Description of drawings
Accompanying drawing is structural representation of the present invention.
Embodiment
Air cooling equipment in direct current machine of the present invention is forced comprises an electric fan, bridge rectifier, aeration type front and rear cover, flexible seals, reaches hold-down screw etc.It is characterized in that electric fan is installed on the aeration type rear end cap outside with hold-down screw, between fan and end cap flexible seals is housed, bridge rectifier is installed in aeration type rear end cap inboard, and its ac input end is connected on the brush of direct current machine, and dc output end then links to each other with electric fan.Described electric fan operating voltage should be consistent with direct current machine; Described bridge rectifier is the universal electronic device, and being used for provides electric fan constant polarity of voltage, and its operating voltage and electric current should be able to adapt to the operating voltage variation of direct current machine and the operating current needs of electric fan; Described aeration type end cap is one to be shaped on the electric motor end cap of ventilation hole, should before and after use in pairs; Described flexible seals is the gap that an annular element is installed in order to shutoff electric fan and end cap, to improve the drafting efficiency of electric fan.
Described electric fan is the main execution unit of forcing cooling, can work in blowing or air draught pattern, so its form can be axial-flow type or centrifugal fan.
Can realize blowing and two kinds of patterns of air draught when adopting tube-axial fan, but the efficient of blowing pattern wants high, fan self also can not be subjected to the influence of motor hot blast.And centrifugal fan is only applicable to the air draught pattern because its structure is limit, though efficient is higher, self can be subjected to the influence of motor hot blast and require to have the hot operation characteristic.
Because the operating voltage of electric fan is taken from direct current machine, therefore the flow of its cooling air is also relevant with electric moter voltage, the motor electric fan of not working or not yet, the big load of motor (high voltage) work then electric fan also high-speed large-flow ventilate, so just realized that the heat radiation that is directly proportional with motor load concerns.
Installed direct current machine of the present invention, because to supply with the voltage of motor lower, electric fan is also with than slow-speed of revolution work when the little load operation of low speed, and ventilation quantity is less.And when the big load slow-speed of revolution of motor is worked, (often be accompanied by high voltage, big electric current, the slow-speed of revolution and high heat this moment), electric fan also can run up owing to obtaining high voltage, these characteristics have satisfied the requirement of high heat radiation just, therefore can discharge the heat that motor produces timely and effectively.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, air cooling equipment comprised in direct current machine of the present invention was forced: the aeration type front end housing 1, the bridge rectifier 2 that is fixed in motor aeration type rear end cap 6 inboards, the electric fan 3 that are installed on direct current machine 7 output axle heads are installed in aeration type rear end cap 6 outsides, flexible seals 5 between electric fan 3 and aeration type rear end cap 6 by hold-down screw 4.Circumferentially there are a plurality of ventilation holes to be used for the circulation of cooling blast on described aeration type front end housing 1 and the aeration type rear end cap 6.Described bridge rectifier 2 is four full-wave rectification bridges that rectifier diode is connected into, and its ac input end is attempted by on the brush, and dc output end connects electric fan 3, is used for to electric fan 3 power supply and fixed power source polarity.Described electric fan 3 is the market purchasing finished product of direct current supply, and its voltage range should be consistent with the operating voltage range of direct current machine 7, and version can be that axial-flow type also can be centrifugal.The annular element that described flexible seals 5 is made for flexible material is used for the gap leakage between shutoff electric fan 3 and the aeration type rear end cap 6, guarantees that air-flow can only be by the circulation of the ventilation hole on the aeration type front and rear cover 1,6.
When direct current machine 7 energising work, the bridge rectifier 2 that is attempted by on the brush obtains electric energy simultaneously, electric fan 3 entrys into service, air-flow flows by the air vent hole on aeration type front end housing 1, the aeration type rear end cap 6, and the heat that direct current machine 7 rotor windings produce is forced to take out of by flow air.Because full wave bridge rectifier has been adopted in power taking, direct current machine 7 will can not influence the work polarity of electric fan 3 when changing the polarity of voltage commutation, and direct current machine 7 is when changing the voltage swing speed governing, electric fan 3 also can change rotating speed thereupon, and ventilation quantity is directly proportional with the operating voltage of direct current machine 7.When the big load operation state of stall appearred being close in direct current machine 7, because institute's making alive is high-end, the rotating speed of electric fan 3 also be maximum, and corresponding ventilation quantity is maximum also, has realized the direct ratio corresponding relation of cooling blast flow and load.