CN2417315Y

CN2417315Y - Centrifugical and double disc type cooling fan

Info

Publication number: CN2417315Y
Application number: CN 00226154
Authority: CN
Inventors: 高东旗
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-03
Filing date: 2000-03-03
Publication date: 2001-01-31
Anticipated expiration: 2010-03-03

Abstract

The utility model discloses a centrifugical and double-disc type cooling fan of a motor. Blades 5 are vertically fixed between an annular curved face-shaped inner disc 7 and an outer disc 4 in a radially symmetrical mode with different distances, and the axial width of each blade is reduced gradually along the radius of each blade; the inner and the outer diameter of the outer disc are provided with flow guiding edges 9, 10. The centrifugical and double-disc type cooling fan of a motor accords with the fluid mechanics principle, and has the characteristics of favorable cooling effect, small air consumption, low noise, etc.

Description

Centrifugal double plate cooling fan

The utility model relates to a kind of centrifugal double plate cooling fan of motor.

A kind of motor of closed miniature motor (the comprising fractional horse power motor) amount of being to use maximum, its without exception employing of cooling carry the fan cooling of ventilating.For not limiting the motor that turns to, centrifugal fan is all adopted in its traditional cooling, the fan blade of this fan radially is the little ear shape broad in the middle in two, the shape of its outer rim and the arc transition of fan housing partly match, air-flow is beaten on fan housing by this fan blade and is reflected greatly, has caused the waste of energy.Intake grill on the fan housing radially distributes with the center of circle, and the air-flow cutting sound is too big.Also have, the structure of this fan does not fully take into account the relation of intake grill and exhaust outlet, the wind path structure does not meet fluid mechanics principle, so will occur in use that eddy current is obvious, noise is big, invisible waste is high, cooling effect is poor, enterprises and institutions is caused bigger economic loss.

The purpose of this utility model is exactly for overcoming the deficiency described in the background technique, and proposes a kind of centrifugal double plate cooling fan of good cooling results.

The technical solution that realizes above-mentioned purpose is such:

This centrifugal double plate cooling fan comprises a fan housing, its mainly be fan blade inner disc and outside between the dish, its axial width reduces with the increase of radius, inner disc and wheel hub are solidified as a whole.Fan blade and the orthogonal setting of inside and outside dish, fan blade be not equidistant radial symmetrical distribution along the circumferential direction.Said inside and outside dish is annular surface, and Pan internal diameter and outer radius are respectively equipped with the water conservancy diversion edge outside.Fan housing is provided with the intake grill of interrupted circular or mesh, and its diameter is less than or equal to the diameter of outer dish water conservancy diversion edge.The external diameter of inner disc is less than or equal to the internal diameter of outer dish.

Fig. 1: structural representation of the present utility model.

The A-A view of Fig. 2: Fig. 1.

Fig. 3: the structural representation of fan housing.

Now reach embodiment in conjunction with the accompanying drawings the utility model is done an explanation.

As shown in Figure 1, this fan has the inner disc 7 and the outer dish 4 of two annular surface shapes, and blade 5 is perpendicular between two dishes and be connected as a single entity mutually, and the axial width of blade 5 reduces along with the increase of its diameter, and inner disc 7 is fixing with wheel hub 8.Coil 4 internal diameter and outer radius outside and be equipped with water conservancy diversion edge 9,10.The external diameter of inner disc 7 is less than or equal to the internal diameter of outer dish 4, to adapt to the needs that add man-hour.Also be provided with guiding grid sheet 2 on electric motor end cap 1, said this guiding grid sheet 1 is corresponding with the radiating fin of motor, and its quantity equates with the radiating fin quantity of motor or becomes multiple to reduce.

Fig. 2 shows the A-A of this fan to structure.In order to guarantee the dynamic balancing of fan, fan blade 5 is radial symmetric and not equidistant vertical distribution between inside and outside dish 7,4.

Air-flow cutting sound when turning round in order to solve fan blade 5 reduces noise, and the intake grill 6 that is positioned on the fan housing 3 adopts interrupted circular structure (referring to Fig. 3), and its maximum diameter is less than or equal to outer 4 the internal diameter that coils.

This fan is when rotating, and air-flow enters from intake grill 6, and is guided by the water conservancy diversion edge 9 of outer dish 4 inner radius, and under centrifugal action, air-flow quickens to flow along blade 5.Because the design of outer dish 4, the air-flow after the acceleration can only flow to the tail end of blade 5 along the negative camber of outer dish 4.Designed water conservancy diversion edge 10 because of the inner radius of coiling 4 outside again, air-flow blows out along the motor fuselage surface is parallel basically.Between outer dish 4 and the fan housing 3 for the ring-type laminar flow eddy current can not occur, so without any reactive loss.Because fan blade 5 has taked axial width along the structural design that its radius aspect progressively reduces, and meets the Nu Baili principle, has also reduced vortex phenomenon.Moreover blade 5 is not being equally spaced of radial symmetric between inside and outside dish 7,4, makes the sound intensity of the ventilation noise stack back of different frequency less than the stack of same frequency noise, so the ventilation noise will weaken.The intake grill 6 of fan housing 3 has adopted and the corresponding to design of fan blade 5 sense of rotation, has reduced the cutting sound of 5 pairs of air-flows of fan blade, also greatly reduces the operation noise simultaneously.Through the actual test of 600 watts of motors, under all identical situation of other condition, only traditional centrifugal cutter is replaced with this double plate cooling fan, electric machine temperature rise has reduced by 13.6 ℃, has good cooling effect.Originally some motors that temperature rise is exceeded standard have become the qualified motor that temperature rise has remaining greatly, can be enterprises and institutions and save substantial contribution.

The fan of this structure also utilizes centrifugal fan axially to brush in the facility of cooling cylindrical body surface applicable to other.

The utility model is simple in structure, and injection moulding, cast aluminium all can be produced, and gas flow meets hydrodynamics Principle has the advantages such as good cooling results, invisible waste is little, noise is low, can replace existing structure fully The motor Centrifugal Cooling Fan.

Claims

1, a kind of centrifugal double plate cooling fan comprises a fan housing (3), it is characterized in that fan blade (5) is positioned between inner disc (7) and the outer dish (4), and its axial width reduces with the increase of radius, and inner disc (7) is solidified as a whole with wheel hub (8).

2, centrifugal cutter as claimed in claim 1 is characterized in that fan blade (5) and the orthogonal setting of inside and outside dish (7,4), and fan blade (5) is not equidistant radial symmetrical distribution along the circumferential direction.

3, centrifugal cutter as claimed in claim 1 or 2 is characterized in that said inside and outside dish (7,4) is annular surface.

4, centrifugal cutter as claimed in claim 1 is characterized in that the internal diameter and the outer radius of coiling (4) outside are respectively equipped with water conservancy diversion edge (9,10).

5, centrifugal cutter as claimed in claim 1 is characterized in that fan housing (3) is provided with the intake grill (6) of interrupted circular or mesh, and its diameter is less than or equal to the diameter of outer dish (4) water conservancy diversion edge (9).

6, centrifugal cutter as claimed in claim 1 is characterized in that the external diameter of inner disc (7) is less than or equal to the internal diameter of outer dish (4).