CN102778030A

CN102778030A - Energy-saving air heater

Info

Publication number: CN102778030A
Application number: CN2012102303796A
Authority: CN
Inventors: 李松生; 鲁豫鑫; 董玛莉
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2012-07-05
Filing date: 2012-07-05
Publication date: 2012-11-14
Anticipated expiration: 2032-07-05
Also published as: CN102778030B

Abstract

The invention relates to an energy-saving air heater. The energy-saving air heater comprises an air chamber front cover, an impeller, an air chamber rear cover, an air inlet, a rotary shaft, a motor stator, a motor rotor, a front support bearing, a front bearing seat, a rear support bearing, a rear bearing seat, a motor casing with spiral cooling fins, an outer air cover with an air inlet, an air inlet, a secondary heating device, an air outlet channel and an air outlet. When the energy-saving air heater works, the motor rotary shaft drives the impeller to rotate at high speed, negative pressure is formed at the position of the air inlet of an air chamber, outside air is sucked by the air inlet at the rear portion of the outer air cover and performs surface contact and heat exchange with the spiral cooling fins on the motor casing when passes through a spiral air flue. Preheated air is subjected to secondary heating of a heating system to reach the required temperature and then is output by the air outlet channel. The energy-saving air heater achieves cooling of a drive motor in work, fully utilizes heat at positions of the drive motor stator and other positions to preheat air in a fan and achieves the purpose of saving energy.

Description

A kind of energy-conservation air-heater

Technical field

The present invention relates to the industrial heat blower fan in a kind of electromechanical engineering field, is a kind of energy-saving high speed air-heater.

Background technology

Air-heater is the first-selected product of modern industry thermal source upgrading, is the optimal heat wind regime configuration of various machineries such as hot blast furnace conveyor, drying oven, baking oven, packaging machine.It is generally pressurizeed to air by the motor-driven impeller, and after heating the temperature that reaches required through heater, the hot blast of output high pressure.The drive motors of air-heater can produce suitable heat when working; Traditional type of cooling is to dry through rear-mounted aerofoil fan; The pressure air that flows during through motor housing and the fin surface on the shell carry out heat exchange and take away heat, be dispersed at last in the atmosphere, like this; Although realized the purpose of cooling motor, this part heat has slatterned fully.

Therefore, how to make full use of this part heat, make it to become the useful energy, just become a problem demanding prompt solution.

Summary of the invention

The present invention is exactly in air-heater, utilizes the heat of cooling motor stator and bearing to come to realize preheating for the air that gets into blower fan, when realizing motor etc. cooled off, has reached energy-conservation purpose.

To achieve these goals, the present invention adopts following technical scheme:

A kind of energy-saving air-heater, it partly is made up of drive system, blower system, preheating air inlet system and post bake system etc.Wherein drive system comprises drive motors stator and rotor, rotating shaft, front and back block bearing, antero posterior axis bearing and electric machine casing etc. again, and blower system comprises air compartment protecgulum, impeller and air compartment bonnet, air inlet and air outlet etc. again; The preheating air inlet system comprises the air inlet of electric machine casing, outer fan housing and the blower fan rear end of band spiral heat dissipation sheet; The post bake system comprises heater and air-out passage etc.

Above-mentioned energy-saving air-heater adopts high-speed electric expreess locomotive to drive, and drive motors stator and rotor are separately fixed in electric machine casing and the rotating shaft, and the rotating shaft of motor is supported by forward and backward bearing group, and forward and backward bearing group is respectively the angular contact ball bearing of two cover configured in parallel and forms.

Above-mentioned energy-saving air-heater, there is spiral fin in the outside of its electric machine casing, constitutes spiral duct with outer fan housing, and communicates with air inlet on the blower system air compartment bonnet.

During work, the air inlet place that the machine shaft impeller is rotated in air compartment at a high speed forms negative pressure, and extraneous air is sucked by the air inlet from outer fan housing rear portion, during through the spirality air channel with electric machine casing on surperficial contact of spiral heat dissipation sheet carry out heat exchange; Since drive motors when work motor stator and block bearing all can produce a part of heat and pass to electric machine casing, antero posterior axis bearing; Flow air is just come cooling motor stator and bearing through heat exchange cooling motor housing in the air channel, obtains preheating simultaneously; After air after the preheating is inhaled into the air compartment of blower fan blower system from the air compartment air inlet, drive is formed high pressure and arrive the air outlet on the air compartment protecgulum, carry out post bake through heating system again and reach temperature required back and export by the air-out passage by impeller.The present invention makes blower fan when work, both realize the cooling to drive motors, and the caloric value that makes full use of positions such as drive motors stator is again carried out preheating to the air that gets in the blower fan, has reached energy-conservation purpose.

The present invention has following outstanding substantial characteristics and marked improvement compared with prior art:

(1) negative pressure of utilizing the air compartment air inlet is as power; The helical channel that utilizes electric machine casing and outer fan housing composition is as ventilating duct; With the interface of the spirality fin on the electric machine casing outside as heat exchange; Get into the inner air of ventilating duct as cooling media, make extraneous air force to get into ventilating duct inside motor etc. is cooled off;

(2) utilize the heat that motor and front and back bearings produced that the air that gets into the ventilating duct internal flow is carried out preheating, and as the air inlet of blower fan, the energy that need expend when making it to be heated to predetermined temperature reduce greatly, has obvious energy-saving advantages.

Description of drawings

Fig. 1 is the structural representation of energy-saving type hot air machine among the present invention.

Fig. 2 is the flow path sketch map of air of the present invention in motor housing and blower fan.

The specific embodiment

The preferred embodiments of the present invention accompanying drawings is following:

Embodiment one:

Referring to Fig. 1; The air-heater that this is energy-conservation comprises air compartment protecgulum 1, impeller 2, rotating shaft 3, air compartment bonnet 4, air inlet 5, front-end bearing pedestal 6, fore bearing 7, electric machine casing 8, rotor 9, motor stator 10, outer fan housing 11, lasso 12, rear bearing 13, rear bearing block 14, back end cover for motor 15, air inlet 16, air-out passage 17, heater 18 and air outlet 19.

Said rotor 9 holds 13 supportings by preceding block bearing 7 and rear trunnion; The peripheral suit exogenous wind cover of electric machine casing; Motor stator 10 directly is fixedly connected with electric machine casing 8; Rotor 9 directly is fixed in the rotating shaft 3, rotating shaft 3 two ends be the angular contact ball bearing of two groups of configured in parallel as forward and backward block bearing

group

7 and 13, forward and backward bearing group is installed in front-end bearing pedestal 6 and rear bearing block 14 inside respectively.

There is spiral fin in the outside of the electric machine casing 8 of above-mentioned blower fan, forms spiral helicine ventilating duct with outer fan housing 11.

Embodiment two:

Present embodiment and embodiment one are basic identical, and special feature is:

Said blower fan protecgulum 1 has said air outlet 19, in air outlet 19 outsides said second heating apparatus 18 is installed, and outer fan housing 11 rearward end have air inlet 16, and said air inlet 5 is arranged on the air compartment bonnet 4 of blower fan, is communicated with the two ends in said helical form air channel respectively.

Referring to Fig. 2; The drive motors impeller is rotation at a high speed in air compartment; Air inlet 5 places at air compartment form negative pressure, and extraneous air is by air inlet 15 suctions of blower fan from outer fan housing 11 rears, the spiral duct inside of flowing through; The spirality fin surface has enough contacts area and flow air to carry out heat exchange with cooling motor housing 8, and then cooling motor stator 10, bearing 7 and 13; It simultaneously also is a warm before getting in the air compartment to air; Air after the preheating sucks air compartment inside from the air inlet 5 on the air compartment bonnet 4; Quilt arrives the air outlet 19 on the air compartment protecgulum after impeller 2 drives of rotation become malleation at a high speed; After carrying out post bake through heater 18 again, reach temperature required by 17 outputs of air-out passage.

Claims

1. energy-saving air-heater; Comprise that air compartment protecgulum (1), impeller (2), air compartment bonnet (4), air inlet (5), rotating shaft (3), motor stator (10), rotor (9), preceding block bearing (7), front-end bearing pedestal (6), rear trunnion hold electric machine casing (8), the outer fan housing (11) of bringing gas port into, air inlet (16), second heating apparatus (18), air-out passage (17) and the air outlet (19) of (13), rear bearing block (14), band spirality fin; It is characterized in that said rotor (9) holds (13) supporting by preceding block bearing (7) and rear trunnion; Electric machine casing (8) peripheral suit exogenous wind cover (11); Hold (13) outer ring with rear trunnion and directly contact with motor stator (10), preceding block bearing (7); The heat that motor stator (10), block bearing (7,13) etc. are produced is easy to directly be passed to electric machine casing (8) through conducting, and there is the ventilating duct of spiral fin and outer fan housing (11) mutual group curl in electric machine casing (8) outside.

2. according to right 1 described energy-saving air-heater; It is characterized in that outer fan housing (11) rearward end has air inlet (16); On the said air compartment bonnet (4) of blower fan said air inlet (5) is arranged; There is said air outlet (19) at the two ends that are communicated with said helical form ventilating duct respectively at said air compartment protecgulum (1), in air outlet (19) outside said second heating apparatus (18) are installed; Make air be able to be inhaled into the helical form ventilating duct, the spirality fin surface with electric machine casing (8) outside in the air channel contacts the realization heat exchange fully, in cooling motor stator (10) and bearing (7,13), makes air obtain preheating; It is inner that air after the preheating gets into air compartment through spiral duct from the air inlet (5) on the air compartment bonnet; Driven the air outlet (19) that forms on the malleation arrival air compartment protecgulum by the impeller (2) of rotation at a high speed afterwards, after second heating apparatus (18) post bake, become hot blast again and go from air-out passage (17) output.