CN102810940A

CN102810940A - Wind path structure of jacket cooling motor

Info

Publication number: CN102810940A
Application number: CN201210317890XA
Authority: CN
Inventors: 许明宇
Original assignee: SEC Electric Machinery Co Ltd
Current assignee: SEC Electric Machinery Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2012-12-05
Anticipated expiration: 2032-08-31
Also published as: CN102810940B

Abstract

The invention discloses a wind path structure of a jacket cooling motor, which is divided into an inner layer and an outer layer by a division plate, wherein the outer layer comprises a backflow air flue and a cooling water chamber arranged along the axial direction; the inner layer comprises an air gap between a stator and a rotor, and an axial ventilating duct in the rotor; when a centrifugal fan is rotated, air passes through a fan blade, the backflow air flue, the axial ventilating flue or the air gap in order and then returns to the fan blade to form a circular cooling wind path. Air holes are formed in the centrifugal fan, a hollow cavity is arranged between the centrifugal fan and a bearing at the back surface of the centrifugal fan; a wind partitioning board is blocked at a part of air inlet of the backflow air flue, the wind partitioning board is provided with a hole communicated with the hollow cavity to form an assistant radiating air flue; and when the centrifugal fan is rotated, air passes through the fan blade, the backflow air flue, the assistant radiating air flue and the hollow cavity in sequence and then returns to the fan blade to form an assistant radiating wind path. By adopting the wind path structure, the bearing at the back surface of the centrifugal fan can be radiated actively, the bearing temperature is reduced, and the reliable operation of the motor is guaranteed.

Description

A kind of wind path structure of water jacket cool electric machine

Technical field

The present invention relates to the wind path field of motor, especially a kind of wind path architecture of water jacket cool electric machine.

Background technology

What the cooling of water jacket support motor was generally adopted is the wind path for axial circulation; Like Fig. 1; When rotor rotated, the centrifugal fan 10 that is connected on the motor shaft 19 rotated, and wind gets into return airway 2 from the end of flabellum 6; Through behind stator winding 20 1 ends vertically between air duct 18 or rotor air gap 16 get back to the bottom of flabellum 6, form the circulation cooling air duct.

Such motor is in operation process; The bearing 9 heating meetings that are positioned at centrifugal fan 10 back sides are more serious; Its reason is: bearing 9 regions are not included on the said circulation cooling air duct; And hot blast can take heat to the centrifugal fan bottom when getting into centrifugal fan, and heat passes in the cavity between centrifugal fan 10 and the bearing 9, causes the bearing temperature rising.Can cause lubricating oil viscosity to descend like this, the wearing and tearing aggravation of roller, the useful life of shortening bearing; After the roller heavy wear simultaneously, the vibration of motor and the enhancing of noise influence useful life of motor.

Summary of the invention

The applicant can not be to the bearing heat radiation at the centrifugal fan back side to the wind path structure of existing water jacket cool electric machine; Also cause this bearing heating easily, influence the motor problem in useful life; A kind of wind path structure of water jacket cool electric machine is provided; Thereby initiatively said bearing is dispelled the heat, reduce said bearing temperature, guarantee the reliability service of motor.

Technical scheme of the present invention is following:

A kind of wind path structure of water jacket cool electric machine; Two-layer inside and outside being divided into by demarcation strip; Comprise the air gap between axial ventilation road, rotor and the stator in the rotor core in the said internal layer, said skin comprises cooling water chamber and peripheral return airway thereof, and said return airway is arranged vertically; Adjacent two return airwaies are separated by fin fully, are connected with centrifugal fan on the rotor; When rotor rotated, wind got into said return airway from the end of flabellum, air through behind stator winding one end vertically between air duct or rotor air gap get back to the bottom of said flabellum, form the circulation cooling air duct; The outside of centrifugal fan is the end cap that bearing is installed, the inboard ring baffle that connects of said end cap, and the edge of said baffle plate has flange, and the lateral surface of said flange is near the back side of flabellum, and leaves the gap; The air inlet of the said return airway of a part blocks up has wind isolation board, forms the auxiliary heat dissipation air channel; Have the hole of connection on said wind isolation board and the said baffle plate; Have pore on the said centrifugal fan; Air comes out from the other end, and gets into said auxiliary heat dissipation air channel after the end of said flabellum gets into the return airway, gets into the cavity between fan and the bearing along the hole again, from said pore, gets back to the flabellum bottom again, forms the auxiliary heat dissipation wind path.

Its further technical scheme is:

Said wind isolation board is connected on the lateral surface of said demarcation strip, is connected with pad between said wind isolation board and the said baffle plate; Have the hole of connection on said wind isolation board, pad and the baffle plate;

The ratio of the number in said return airway and said auxiliary heat dissipation air channel is between 4 ~ 15.

Beneficial effect of the present invention is following:

The present invention is adapted as the auxiliary heat dissipation air channel with a part of return airway; Can cold wind be guided to the back side of centrifugal fan; Bearing in this zone cools off; Can reduce thus the bearing at the centrifugal fan back side operating temperature, prolong bearing life, can also guarantee the stable operation of motor, prolong motor useful life.

Description of drawings

Fig. 1 is the wind path architecture sketch map of existing water jacket cool electric machine.

Fig. 2 is a wind path structural representation of the present invention.

Fig. 3 is the A-A cutaway view of Fig. 2.

Fig. 4 is the B-B cutaway view of Fig. 2.

Fig. 5 is the C-C cutaway view of Fig. 2.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present invention is described.

As shown in Figure 3, the present invention is two-layer inside and outside being divided into by demarcation strip 4, comprises the air gap 16 of 15 of axial ventilation road 18 and rotor 17 and stators in the rotor core 17 in the said internal layer; Said skin is divided into 16 return airwaies 2 equably by fin 21, is respectively equipped with cooling water chamber 3 in the return airway 2.As shown in Figure 4, the two ends of return airway 2 have air inlet and air outlet, because both shapes are identical, said air outlet are not drawn in this accompanying drawing.

As shown in Figure 2, return airway 2 of the present invention and cooling water chamber 3 are arranged vertically; The air inlet of return airway 2 faces the end of flabellum 6, and its air outlet is positioned at the other end.Centrifugal fan 10 is connected on the electric machine main shaft through bolt, and flabellum 6 connects through bolt.The back side of centrifugal fan 10 is End cover for motor 7, and bearing 9 and annex thereof are installed in the end cap 7.Also be welded with the baffle plate 5 of a circle annular on the medial surface of end cap 7, the edge of baffle plate 5 has flange, and the lateral surface of said flange is pressed close to the back side of flabellum 6 thereby between centrifugal fan 10 and bearing 9, formed a cavity.The surface of centrifugal fan 10 also offers pore 8, and pore 8 is over against the bottom of flabellum 6.Flabellum 6 is a sabre shape, and when fan 10 rotations, very strong negative pressure can be formed on the bottom of the flabellum 6 of this shape, and the air in the said cavity can be by said negative pressure through pore 8 sucking-offs.

Wind isolation board 12 is installed on the air inlet of two said return airwaies 2, and a side of wind isolation board 12 is connected on the demarcation strip 4 through bolt; Can certainly pass through methods such as welding, riveted joint and connect, wind isolation board 12 can also be connected on the miscellaneous part simultaneously; Its opposite side is bridged on the lateral surface of baffle plate 5, changes return airway 2 into auxiliary heat dissipation air channel 14.Be provided with pad 11 between wind isolation board 12 and the baffle plate 5, with the setting angle of adjustment wind isolation board 12.As shown in Figure 5, have the hole 22 that is communicated with successively on wind isolation board 12, pad 11 and the baffle plate 5.

When motor shaft 19 begins to rotate, the inside of motor can form two wind paths:

The first via: under saber shaped flabellum 6 effects, the air of flabellum 6 bottoms is admitted to return airway 2,; Be provided with cooling water chamber 3 in the return airway 2, hot-air is cooled at this; After cold air leaves return airway 2, through stator coil 20, come the bottom of flabellum 6 along air gap 16 or axial ventilation road 18, take away the heat in stator 15, rotor 18 and the stator coil 20 simultaneously, form main heat radiation circulation wind path;

The second the tunnel: because the negative pressure of sabre shape flabellum bottom is very strong, the air in centrifugal fan 10 backside cavity is inhaled in the flabellum 6 through pore 8, is admitted to return airway 2 coolings then, and blows out from opposite side; Because the air pressure in the cavity descends, the air in the auxiliary heat dissipation air channel 14 gets into said cavity through the hole on wind isolation board 12, pad 11 and the baffle plate 5 22; This moment, auxiliary heat dissipation air channel 14 interior air pressure descended, and auxiliary heat dissipation air channel 14 can suck in the cold air that blows out in the return airway 2, forms auxiliary heat dissipation circulation wind path.

Auxiliary heat dissipation air channel 14 is obtained by return airway 2 repackings, if the quantity in auxiliary heat dissipation air channel 14 too much will influence the efficient of main heat radiation circulation, but very few words do not have good thermolysis again.In general, when motor speed was higher, bearing heating was more serious, thereby the quantity in auxiliary heat dissipation air channel 14 will increase.In general; The heat radiation requirement of bearing arrangement 9 just can be satisfied in 1-2 auxiliary heat dissipation air channel 14; Only under the situation that still can not satisfy bearing heat radiation requirement, just can consider to increase auxiliary heat dissipation air channel 14; But return airway 2 is unsuitable too small with the ratio of the number in auxiliary heat dissipation air channel 14, in order to avoid the main heat radiation circulation of influence.According to the result of use of reality, when in former 16 return airwaies 2, offering an auxiliary heat dissipation air channel 14, the temperature of bearing 9 descends to some extent, and this moment, return airway 2 was 15 with the ratio of the number in auxiliary heat dissipation air channel 14; When offering 2 auxiliary heat dissipation air channels 14, the temperature of bearing 9 has obvious decline, and this moment, both quantity ratios were 7; Ratio when offering 3 auxiliary heat dissipation air channels 14 is 4.33; Circulation wind path shared return airway 2 further reduce because the master is dispelled the heat this moment; Radiating effect to main component of electrical machine has caused certain influence; Thereby the applicant is defined as the ratio of the number in return airway 2 and auxiliary heat dissipation air channel 14 between 4 ~ 15, and the technical staff can be according to the real work situation, the ratio of both numbers of choose reasonable.

Because the negligible amounts in auxiliary heat dissipation air channel should circumferentially evenly arranged auxiliary heat dissipation air channel 14.So, the air inlet of the return airway 2 that hot-air can close on from auxiliary heat dissipation air channel 14 flows away, and avoids hot-air in small space 13 accumulated of wind isolation board 12 with flabellum 6 ends.

The shape in return airway 2, auxiliary heat dissipation air channel 14 and axial ventilation road 18 can design according to actual needs, and present embodiment only supplies technical staff's reference, so that understand the present invention more intuitively.More than describing is to explanation of the present invention, is not limitation of the present invention, and institute of the present invention restricted portion is referring to claim.Under the situation of basic structure of the present invention, the present invention can do any type of modification.

Claims

1. the wind path structure of a water jacket cool electric machine; Two-layer inside and outside being divided into by demarcation strip (4); Comprise the air gap (16) between axial ventilation road (18), rotor and the stator in the rotor core in the said internal layer, said skin comprises cooling water chamber (3) and peripheral return airway (2) thereof, and return airway (2) are arranged vertically; Adjacent two return airwaies (2) are separated by fin (21) fully, are connected with centrifugal fan (10) on the rotor; When rotor rotated, air got into return airway (2) from the end of flabellum (6), through behind stator winding (20) one ends vertically between air duct (18) or rotor air gap (16) get back to the bottom of flabellum (6), form the circulation cooling air duct; The outside of centrifugal fan (10) is for being equipped with the end cap (7) of bearing (9), and the inboard of end cap (7) connects ring baffle (5), and baffle plate (5) edge has flange, and the lateral surface of said flange is near the back side of flabellum (6), and leaves the gap; It is characterized in that: the air inlet of partial reflux air channel (2) is stifled to have wind isolation board (12) to form auxiliary heat dissipation air channel (14); Have the hole (22) of connection on wind isolation board (12) and the baffle plate (5), have on the centrifugal fan (10) over against the pore (8) of flabellum (6) bottom; Air is after the end of flabellum (6) gets into return airway (2); (2) other end comes out and gets into auxiliary heat dissipation air channel (14) from the return airway; Get into the cavity between fan (10) and the bearing (9) along hole (22) again; From pore (8), get back to flabellum (6) bottom again, form the auxiliary heat dissipation wind path.

2. the wind path structure of water jacket cool electric machine according to claim 1, it is characterized in that: wind isolation board (12) is connected on the lateral surface of demarcation strip (4), is connected with pad (11) between wind isolation board (12) and the baffle plate (5); Have the hole (22) of connection on wind isolation board (12), pad (11) and the baffle plate (5).

3. the wind path structure of water jacket cool electric machine according to claim 1, it is characterized in that: the ratio of the number of return airway (2) and auxiliary heat dissipation air channel (14) is between 4 ~ 15.