CN115263815B - Motor fan cover - Google Patents
Motor fan cover Download PDFInfo
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- CN115263815B CN115263815B CN202211173791.9A CN202211173791A CN115263815B CN 115263815 B CN115263815 B CN 115263815B CN 202211173791 A CN202211173791 A CN 202211173791A CN 115263815 B CN115263815 B CN 115263815B
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- line segment
- motor
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- line
- segment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of motors, and provides a motor fan cover which comprises a first air guide disc, wherein the inner contour line of the section of the first air guide disc in the direction along the axis of a motor comprises two line segments which are symmetrical by the axis of the motor; each line segment comprises a first line segment, a second line segment and a third line segment which are connected in sequence; wherein: from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first air guide disc is in a decreasing trend; the third line section is closer to the air outlet side of the motor fan housing relative to the first line section; the inner diameter of the first air guide disc keeps equal or increases from the first end of the third line segment to the second end of the third line segment; the second line segment is a curve segment connecting the first line segment and the third line segment; from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first air guiding disc is in a decreasing trend. The motor fan cover provided by the embodiment of the invention can improve the wind speed of the wind outlet.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor fan cover.
Background
At present, the motor fan housing is often required to be arranged on the outer side of the motor fan, and the motor fan housing can play a role in guiding the air to flow in addition to a protection role for the motor fan. The working condition of the existing motor fan cover is observed in a finite element fluid simulation mode, so that large-area eddy current loss can be known to occur in the motor fan cover, and the air speed at the air outlet of the motor fan cover can be greatly reduced.
Disclosure of Invention
The embodiment of the invention provides a motor fan cover which can improve the air speed of an air outlet.
One embodiment of the invention provides a motor fan cover, which comprises a first air guide disc, wherein the inner contour line of the section of the first air guide disc in the direction along the axis of a motor comprises two line segments which are symmetrical with the axis of the motor; each line segment comprises a first line segment, a second line segment and a third line segment which are connected in sequence; wherein:
from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first air guiding disc is in a decreasing trend; the first end of the first line segment is one end of the two end points of the first line segment which is not connected with the second line segment, and the second end of the first line segment is one end of the two end points of the first line segment which is connected with the second line segment;
the third line section is closer to the air outlet side of the motor fan housing relative to the first line section; the inner diameter of the first wind guide disc keeps equal or increases from the first end of the third line segment to the second end of the third line segment; the first end of the third line segment is one end of the two endpoints of the third line segment, which is connected with the second line segment, and the second end of the third line segment is one end of the two endpoints of the third line segment, which is not connected with the second line segment;
the second line segment is a curve segment connecting the first line segment and the third line segment; from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first air guiding disc is in a decreasing trend.
In one embodiment, the first line segment is a straight line segment, and an included angle between an extension line of the first line segment and the axis of the motor is greater than or equal to 60 ° and smaller than 90 °.
Further, the first line segment is parallel to a first outer contour line, the first outer contour line is an outer contour line of a radial portion of a section of the second air guiding plate along the axial direction of the motor, and the second air guiding plate is used for installing a fan blade of the motor.
In one embodiment, each line segment further comprises:
and the fourth line segment is connected with the first end of the first line segment and is parallel to the axis of the motor, and the fourth line segment and the second line segment are positioned at two sides of the first line segment.
Further, the coordinates (x, y) of each point on the first line segment conform to the following first relation:
y= 
in the formula (I), the compound is shown in the specification,
the included angle between the extension line of the first line segment and the axis of the motor is formed;
the distance between the fourth line segment and the motor axis is calculated;
is the length of the fourth line segment; r4 is the arc radius corresponding to the second line segment; r2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor; the first end of the first line segment has coordinates of (A)
，
) (ii) a The second end of the first line segment has coordinates of (A), (B)
，
) The coordinate system adopted by the first relational expression takes the motor axis as a horizontal axis and takes a perpendicular line between the first end of the fourth line segment and the motor axis as a vertical axis; the first end of the fourth line segment is one of two endpoints of the fourth line segment which is not connected with the first line segment.
Further, the second line segment is a circular arc-shaped curve segment, and the coordinates (x, y) of each point on the second line segment conform to the following second relation:
y=
4
wherein R4 is the second segmentThe corresponding arc radius; x3 is the abscissa of the first end of the third line segment; r2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor;
the included angle between the extension line of the first line segment and the axis of the motor is formed;
is the distance between the fourth line segment and the motor axis;
is the length of the fourth line segment; the first end of the second line segment has coordinates of (A)
，
) The second end of the second line segment has the coordinate of (
，
）；x3= 
(ii) a The coordinate system adopted by the second relational expression takes the motor axis as a horizontal axis, a vertical line between the first end of the fourth line segment and the motor axis as a vertical axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment.
In one embodiment, the third line segment is a straight line segment parallel to the motor axis.
In one embodiment, the third line segment is a curved line segment, and an included angle between a tangent of a second end of the third line segment and the axis of the motor is greater than 0 ° and equal to or less than 60 °.
Further, the third line segment is a circular arc-shaped curve segment, and the coordinates (x, y) of each point on the third line segment conform to a third relation:
y=
in the formula (I), the compound is shown in the specification,
the distance between the second end of the third line segment and the axis of the motor is set;
the distance between the connecting point of the second line segment and the third line segment and the axis of the motor is obtained; l2 is the horizontal distance between the connecting point between the second line segment and the third line segment and the second end of the third line segment; x3 is the abscissa of the first end of the third line segment;
is the distance between the fourth line segment and the motor axis;
the radius of the arc corresponding to the second line segment;
the included angle between the extension line of the first line segment and the axis of the motor is formed; the coordinate of the first end of the third line segment is (
，
) The coordinate of the second end of the third line segment is (
）；x3= 
(ii) a The coordinate system adopted by the third relation takes the motor axis as a transverse axis, takes a perpendicular line between the first end of the fourth line segment and the motor axis as a longitudinal axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment.
In one embodiment, a connecting point between the second line segment and the third line segment and a point where the maximum outer diameter of the motor fan is located are perpendicular to the motor axis.
In one embodiment, the motor fan housing further includes a housing body provided with an air outlet, a buckle is arranged on the housing body, a clamping groove adapted to the buckle is arranged on the outer wall of the first air guiding disc, and the housing body and the first air guiding disc are connected through the buckle and the clamping groove.
According to the motor fan cover provided by the embodiment of the invention, from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first air guide disc is in a decreasing trend, namely the part of the first air guide disc on the first line segment is inwards concave, and from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first air guide disc is in a decreasing trend, namely the part of the first air guide disc on the second line segment is continuously inwards concave, so that the inner wall of the motor fan cover gradually approaches to but does not touch an inner motor fan, the inner space of the fan cover can be greatly reduced, the inner space capable of generating vortex can be reduced, namely the vortex loss is reduced, gas can be smoothly blown out of the fan cover, the ventilation performance is improved, the wind speed of an air outlet is increased, the heat dissipation efficiency is improved, and the temperature rise is reduced. Because the temperature rise is reduced, the using amount of enameled wires does not need to be increased, the cost is reduced, a large fan does not need to be adopted, and the efficiency of the motor can be improved. Moreover, from the first end to the second end of the third line segment, the inner diameter of the first air guiding disc can have an increasing trend, namely the first air guiding disc has a trend of expanding outwards at the third line segment part, so that the outflow of air flow is facilitated, and the air speed of the air outlet can be further increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a first wind guiding plate according to an embodiment of the present invention;
fig. 2 is a schematic view of an inner contour line of a cross section of the first air deflection disc of fig. 1 in a direction along the axis of the motor;
FIG. 3 is a schematic illustration of a cross-section of the first air deflection disc of FIG. 1 taken along the axis of the motor;
fig. 4 is a schematic view of a cross section of a first wind guiding plate along the axial direction of a motor in one embodiment of the present invention;
FIG. 5 is a schematic illustration of a cross-section of a first air deflection disc and a second air deflection disc taken along an axis of a motor in accordance with an embodiment of the present invention;
FIG. 6 is a schematic view of the construction of a housing according to an embodiment of the invention;
fig. 7 is a schematic view of a cross section of the first air deflection disc and the inner wall of the housing along the axis of the motor in one embodiment of the present invention.
Reference numerals:
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
In a first aspect, an embodiment of the present invention provides a motor fan cover, which includes a first air guiding plate, where the first air guiding plate may also be referred to as an air guiding plate.
For example, the structure shown in fig. 1 is an alternative structure of the motor fan housing provided in the embodiment of the present invention. In fig. 1, the first wind guiding plate is a ring structure, and the ring structure takes the motor axis as a symmetry axis. The first air guide disc is cut along the first direction to obtain a circular ring-shaped section which is a closed structure. The first direction is a direction perpendicular to the axis of the motor. And cutting the first air guide disc along a second direction to obtain two sections which are symmetrical about the axis of the motor, wherein the second direction is the direction of the axis of the motor.
Fig. 2 is a schematic cross-sectional view of the first air guiding disk of fig. 1 cut along a second direction, i.e., a direction of the motor axis, and fig. 3 is a schematic cross-sectional view of the first air guiding disk of fig. 1 cut along the second direction, i.e., the direction of the motor axis. The cross section can also be referred to as a cross section, and in the cross-sectional representation shown in fig. 2, only a projection of the cut cross section of the first wind deflector is shown. In the sectional illustration shown in fig. 3, in addition to the projection of the cross section, the projection of the remaining part of the first wind deflector is shown, except for the cut-out part, and is thus a closed shape.
Referring to fig. 2, an inner contour of a cross section of the first air guiding disc in the axial direction of the motor comprises two line segments which are symmetrical with the axis of the motor, and the inner contour is a projection of the inner wall. Referring to fig. 3, a cross section of the first wind-guiding plate along the motor axis is a closed shape taking the motor axis as a symmetry axis, and the structure of the first wind-guiding plate in the embodiment of the present invention is understood with reference to fig. 2 and 3. For convenience of description, the following description is mainly based on a schematic cross-sectional view, which is only used as an aid to understanding.
Based on the above example, in the embodiment of the present invention, the inner contour line of the cross section of the first air guiding disc in the direction along the axis of the motor includes two line segments symmetrical to the axis of the motor, and each line segment includes a first line segment, a second line segment, and a third line segment that are connected in sequence; wherein:
from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first air guiding disc is in a decreasing trend; the first end of the first line segment is one end of the two end points of the first line segment which is not connected with the second line segment, and the second end of the first line segment is one end of the two end points of the first line segment which is connected with the second line segment;
the third line section is closer to the air outlet side of the motor fan housing relative to the first line section; the inner diameter of the first wind guide disc keeps equal or increases from the first end of the third line segment to the second end of the third line segment; the first end of the third line segment is one end of the two endpoints of the third line segment, which is connected with the second line segment, and the second end of the third line segment is one end of the two endpoints of the third line segment, which is not connected with the second line segment;
the second line segment is a curve segment connecting the first line segment and the third line segment; from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first air guiding disc is in a decreasing trend.
The inner diameter of the first air guiding disc has a tendency of decreasing from the first end of the first line segment to the second end of the first line segment, that is, each point in the first line segment is gradually close to the axis of the motor from the first end to the second end, so that the part of the first air guiding disc in the first line segment is gradually inwards concave and is not outwards convex.
The third line segment is closer to the air outlet of the motor fan housing relative to the first line segment, the broken part on the right side in fig. 2 corresponds to the air outlet of the motor fan housing, and the straight line between the second end of the upper third line segment and the second end of the lower third line segment in fig. 3 corresponds to the air outlet of the motor fan housing.
The inner diameter of the first air guiding disc keeps equal or increases from the first end of the third line segment to the second end of the third line segment, that is, the inner diameter of the first air guiding disc keeps constant from the first end of the third line segment to the second end of the third line segment, and the inner diameter has a trend of increasing. In the first case, the inner diameter is constant from the first end to the second end of the third line segment, i.e. the third line segment is a straight line segment. In the second case, the inner diameter has an increasing trend from the first end to the second end of the third line segment, i.e. points on the third line segment are gradually farther from the motor axis in the direction from the first end to the second end.
The second line segment is used for connecting the first line segment and the third line segment, and particularly connecting the second end of the first line segment and the first end of the third line segment. It may serve as a smooth connection, and thus the second line segment may be a curved line segment smoothly connecting the first line segment and the third line segment. That is, the slope of the tangent to the first line segment at the second end of the first line segment is equal to the slope of the tangent to the second line segment at the first end of the second line segment, and the slope of the tangent to the second line segment at the second end of the second line segment is equal to the slope of the tangent to the third line segment at the first end of the third line segment.
The inner diameter of the first air guiding disc is in a decreasing trend from the second end of the first line segment to the first end of the third line segment, namely from the first end of the second line segment to the second end of the second line segment, the inner diameter of the first air guiding disc is in a decreasing trend, namely each point on the second line segment is gradually close to the axis of the motor from the first end to the second end of the second line segment, and the distance between the second end of the second line segment and the axis of the motor is smaller than the distance between the first end of the second line segment and the axis of the motor. It can be seen that the second line segment is continuously concave.
The first end of the first line segment is one end of the two end points of the first line segment which is not connected with the second line segment, and the second end of the first line segment is one end of the two end points of the first line segment which is connected with the second line segment; the first end of the second line segment is one of the two endpoints of the second line segment connected with the first line segment, and the second end of the second line segment is one of the two endpoints of the second line segment connected with the third line segment. The first end of the third line segment is one of the two endpoints of the third line segment which is connected with the second line segment, and the second end of the third line segment is one of the two endpoints of the third line segment which is not connected with the second line segment. It can be seen from fig. 2 that the first end of a line segment is the end point located on the left side of the two end points of the line segment, and the second end of a line segment is the end point located on the right side of the two end points of the line segment.
In the motor fan housing provided in the embodiment of the present invention, from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first wind-guiding disc is in a decreasing trend, that is, the portion of the first wind-guiding disc on the first line segment is recessed inward, and from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first wind-guiding disc is in a decreasing trend, that is, the portion of the first wind-guiding disc on the second line segment is recessed inward continuously, so that the inner wall of the motor fan housing is gradually close to but does not touch the motor fan inside, which can greatly reduce the internal space of the first wind-guiding disc, that is, reduce the internal space capable of generating eddy currents, that is, reduce eddy current loss, thereby reduce the internal negative pressure of the motor fan housing, and further improve the wind speed of the wind outlet of the motor fan housing. Moreover, from the first end to the second end of the third line segment, the inner diameter of the first air guiding disc has an increasing trend, namely the first air guiding disc has a trend of expanding outwards at the third line segment part, so that the outflow of airflow is facilitated, and the wind speed of the air outlet can be further increased.
Fig. 2 and 3 show a structure of a first wind guide plate, each line segment includes a first line segment AB, a second line segment BC, and a third line segment CD, which are connected in sequence, and the two line segments are symmetrical to each other about a motor axis OO'. In fig. 2 and 3, the third line segment CD is a curved line segment.
In one embodiment, referring to fig. 4, each line segment further comprises:
and a fourth line segment EA connected to the first end of the first line segment AB and parallel to the motor axis OO', the fourth line segment EA and the second line segment BC being located at both sides of the first line segment AB.
That is to say, the fourth line segment, the first line segment, the second line segment and the third line segment are connected in sequence, and the fourth line segment is parallel to the axis of the motor.
Understandably, because the fourth line segment is arranged, the inner space of the first air guiding disc is increased, and the increased inner space can not cause the increase of the vortex, because the vortex is generally generated in the space between the fan blade and the inner wall of the first air guiding disc, and the inner space corresponding to the fourth line segment has a certain horizontal distance with the fan blade, the vortex can not be generated in the inner space corresponding to the fourth line segment, and because a part of inner space is increased, more parts can be accommodated, and related parts are placed in the space.
Fig. 4 shows another first wind-guiding plate structure, where each line segment includes a fourth line segment EA, a first line segment AB, a second line segment BC, and a third line segment C D 'connected in sequence, and the two line segments are also symmetric about the motor axis OO'. In fig. 4, the third line segment C D' is a straight line segment.
In one embodiment, the first line segment may be a straight line segment, and an included angle between an extension line of the first line segment and the motor axis is greater than or equal to 60 ° and smaller than 90 °.
It can be understood that the first line segment is a straight line segment, so that the manufacturing process of the first air guiding disc is simple. The included angle between the extension line of the first line segment and the axis of the motor is more than or equal to 60 degrees and less than 90 degrees, which is a reasonable range and is suitable for most of motor fans.
For example, the angle between the fourth line segment and the first line segment is 115 ° based on the fourth line segment.
Furthermore, the first line segment is parallel to a first outer contour line, the first outer contour line is an outer contour line of a radial portion of a cross section of the second wind guiding plate along the axial direction of the motor, and the second wind guiding plate is a wind guiding plate for mounting motor blades.
Referring to fig. 5, a second air guiding disc is arranged in the motor fan housing, and the second air guiding disc has two functions: one to mount fan blades and one to direct airflow. The second air guiding disc comprises two parts, one part is an annular part 21 which is coaxial with the axis OO' of the motor, and the part can be connected with a driving shaft of the motor so as to drive the fan blades 10 to rotate; a portion 22 with a radial cross-section, which may be used for recessed mounting of the fan blade 10.
In order to enable the first wind deflector and the second wind deflector to be guided uniformly, the first line segment and the first outer contour line may be parallel, specifically, the first line segment and the first outer contour line which are located on the same side of the motor axis are parallel, and the so-called outer contour line is an outer contour line of a radial portion in a cross section of the second wind deflector along the motor axis direction.
In the embodiment of the present invention, the inner contour line refers to a line corresponding to an inner wall in a cross-sectional view, the outer contour line refers to a line corresponding to an outer wall in a cross-sectional view, and in fig. 5, a line facing toward an inner wall of the motor fan housing in a radial portion of the cross-section is an outer contour line.
Therefore, the inner wall of the first air guide disc in the first line segment part is parallel to the outer wall of the part, with the radial section, of the second air guide disc, so that the air flow of the first air guide disc and the air flow of the second air guide disc are guided consistently, and the eddy is reduced.
In one embodiment, on the basis of setting the fourth line segment, the coordinates (x, y) of each point on the first line segment conform to a first relation as follows:
y=
in the formula (I), the compound is shown in the specification,
the included angle between the extension line of the first line segment and the axis of the motor is formed;
the distance between the fourth line segment and the motor axis is calculated;
is the firstThe length of the four line segments; the coordinate of the first end of the first line segment is (
，
) (ii) a The second end of the first line segment has coordinates of (A), (B)
，
) R4 is the arc radius corresponding to the second line segment, and R2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor.
The coordinate system adopted by the first relational expression takes the motor axis as a horizontal axis, and takes a perpendicular line between the first end of the fourth line segment and the motor axis as a vertical axis; the first end of the fourth line segment is one of two endpoints of the fourth line segment which is not connected with the first line segment.
It can be understood that, under the above coordinate system, the coordinates of the first end of the fourth line segment are (0,
) The coordinate of the second end of the fourth line segment is (
). The first end of the fourth line segment is not connected with the first line segment, and the second end of the fourth line segment is connected with the first line segment. That is, when the abscissa is larger than 0 and smaller than 0
The ordinate of the point on the fourth line segment is
。
Understandably, the first oneThe coordinate of the first end of a line segment is (
) Coordinates of the second end of the first line segment (c) ((c))
，
) If the first line segment is a straight line segment, the first relation can be obtained by fitting two endpoints. That is, when the abscissa is in the range (L1,
) The ordinate and the abscissa of each point satisfy the first relational expression.
Wherein the included angle
An angle may be selected from [60 °,90 °).
In one embodiment, on the basis of setting a fourth line segment, the second line segment is a curved line segment in the shape of a circular arc, and the coordinates (x, y) of each point on the second line segment conform to the following second relation:
y=
4
in the formula, R4 is the arc radius corresponding to the second line segment; x3 is the abscissa of the first end of the third line segment; r2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor; the coordinate of the first end of the second line segment is (
，
) Of said second line segmentThe second end has the coordinates of (
，
），
The included angle between the extension line of the first line segment and the axis of the motor is formed;
is the distance between the fourth line segment and the motor axis;
is the length of the fourth line segment.
Wherein, x3=
。
The coordinate system adopted by the second relational expression takes the motor axis as a horizontal axis, a perpendicular line between the first end of the fourth line segment and the motor axis as a vertical axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment. It can be seen that the coordinate systems used for the first relation and the second relation are the same.
It will be appreciated that the second relation may be obtained by first determining the coordinates of the first end and the coordinates of the second end of the second line segment, and then performing a circular arc curve fitting based on the coordinates of these two points. That is, when the abscissa is (a)
，
) Within the range, the ordinate and abscissa of each point satisfy the second relationshipFormula (II) is shown.
In one embodiment, referring to fig. 4, the third line segment C D 'is a straight line segment parallel to the motor axis OO'.
At this time, the ordinate of each point on the third line segment is R3, and the abscissa of the first end of the third line segment is R3
The abscissa of the second end of the third line segment is
。
In one embodiment, the third line segment is a curved line segment, and an included angle between a tangent of a second end of the third line segment and the axis of the motor is greater than 0 ° and equal to or less than 60 °.
It can be understood that when the third line segment is a curved line segment, the included angle between the tangent of the second end of the third line segment and the axis of the motor should not be too large, the too large included angle can lead to the difficulty of the manufacturing process to be increased, the too large included angle is not large for increasing the wind speed of the air outlet, and the wind flow can be in disorder as long as the included angle is within a reasonable range, so that the included angle range is set.
It can be understood that the third line segment is a curved line segment, which can make the airflow at the front end of the fan cover smoother, further increase the wind speed at the wind outlet, and specifically increase the wind speed to 12.67m/s.
In one embodiment, on the basis of the fourth line segment EA, the third line segment is a curved line segment with a circular arc shape, and the coordinates (x, y) of each point on the third line segment CD conform to the following third relation:
y=
in the formula (I), the compound is shown in the specification,
the distance between the second end of the third line segment and the axis of the motor is obtained;
the distance between the connecting point of the second line segment and the third line segment and the axis of the motor is obtained; l2 is the horizontal distance between the connecting point between the second line segment and the third line segment and the second end of the third line segment; x3 is the abscissa of the first end of the third line segment; the coordinate of the first end of the third line segment is (
，
) (ii) a The second end of the third line segment has coordinates of (A)
）；
Is the distance between the fourth line segment and the motor axis;
the radius of the arc corresponding to the second line segment;
is an included angle between the extension line of the first line segment and the axis of the motor.
Wherein, x3=
。
The coordinate system adopted by the third relational expression takes the motor axis as a horizontal axis, a perpendicular line between the first end of the fourth line segment and the motor axis as a vertical axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment. It can be seen that the coordinate systems adopted by the three relations provided by the embodiment of the present invention are the same.
It is understood that the coordinates of the first end and the coordinates of the second end of the third line segment may be determined first, and then arc curve fitting may be performed based on the coordinates of the two points, so as to obtain the third relation. That is, when the abscissa is (a), (b) and (c)
，
) Within the range, the ordinate and abscissa of each point satisfy a third relational expression.
In one embodiment, a line connecting a connecting point between the second line segment and the third line segment and a point where the maximum outer diameter of the motor fan is located is perpendicular to the motor axis.
That is to say, the abscissa of the point of the maximum outer diameter of the motor fan at the connection point between the second line segment and the third line segment is the same, which can also be referred to as position correspondence, so that the air flow in the motor fan housing can be guided more favorably.
In an embodiment, the motor fan housing may further include a housing body provided with an air outlet, the housing body is provided with a buckle, the outer wall of the first wind guide plate is provided with a slot adapted to the buckle, and the housing body and the first wind guide plate are connected through the buckle and the slot.
Referring to fig. 6, the structure of the cover body is shown, and after the cover body shown in fig. 6 is connected with the first air guiding disc shown in fig. 4, a motor fan housing is obtained. In fig. 7, a line segment 30 is a line corresponding to the inner wall of the cover body, and it can be seen that the line of the inner wall of the cover body is located outside the line of the first wind scooper, that is, the function of the first wind scooper is not affected by the cover body.
It can be understood that the connection mode of the buckle and the clamping groove is particularly suitable for the case that the third line segment is a curve segment, and when the third line segment is the curve segment, if the first guide disc and the cover body are integrally processed, the difficulty is high, so that the first guide disc and the cover body are separately processed, and then the first guide disc and the cover body are connected through the buckle and the clamping groove. Of course, if the third line segment is a straight line segment, the first guide disc and the cover body can also be connected by adopting a buckle and a clamping groove. However, since the third segment is a straight segment and can be integrally formed with the cover, it is not necessary to connect the third segment with the cover through a snap.
After the finite element calculation model is adopted to simulate the motor fan housing provided by the embodiment of the invention, the eddy area in the motor fan housing provided by the embodiment of the invention is greatly reduced, so that the airflow blown out by the fan can smoothly flow out of the fan housing. By carrying out point value taking at the same position on the air flow speed at the air outlet, the air speed of the air outlet of the existing fan housing is 10.89m/s, the air speed of the air outlet of the fan housing provided by the embodiment of the invention is 12.4743m/s, and the air speed is improved by about 15 percent.
Furthermore, the motor fan housing provided by the embodiment of the invention is compared with the motor fan housing in the prior art in a temperature field simulation manner, and the temperature rise conditions of the motor base and the winding are monitored, so that the temperature rise of the motor base and the winding in the embodiment of the invention is improved, the temperature of the motor base is reduced by about 6.5K, and the temperature of the winding is reduced by about 9K. See in particular the comparative data shown in table 1 below:
TABLE 1
The temperature is given in K in Table 1. It can be seen from table 1 that the temperature of both the base and the winding is reduced.
It can be understood that when the temperature rise of a motor is relatively high, the amount of the enameled wire is increased, so as to reduce the heating loss of the motor. Or a fan with the size larger than one is selected, so that the wind abrasion of the motor is increased, and the efficiency of the motor is reduced. And if the motor fan cover provided by the embodiment of the invention is adopted at the outer side of the motor fan. The motor fan cover provided by the embodiment of the invention is concave, the internal space is smaller, and the low-pressure space which can be generated is smaller, so that the vortex can be reduced, the air can be smoothly blown out of the fan cover, the ventilation performance is improved, the air speed of an air outlet is increased, the heat dissipation efficiency is improved, and the temperature rise is reduced. Because the temperature rise is reduced, the using amount of the enameled wires does not need to be increased, the cost is reduced, a large fan does not need to be adopted, and the efficiency of the motor can be improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this disclosure may be implemented in hardware, software, hardware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (8)
1. The motor fan cover is characterized by comprising a first air guide disc, wherein an inner contour line of the cross section of the first air guide disc in the direction along the axis of a motor comprises two line segments which are symmetrical with the axis of the motor; each line segment comprises a first line segment, a second line segment and a third line segment which are connected in sequence; wherein:
from the first end of the first line segment to the second end of the first line segment, the inner diameter of the first air guide disc is in a decreasing trend; the first end of the first line segment is one end of the two end points of the first line segment which is not connected with the second line segment, and the second end of the first line segment is one end of the two end points of the first line segment which is connected with the second line segment;
the first line segment is a straight line segment, and an included angle between an extension line of the first line segment and the axis of the motor is more than or equal to 60 degrees and less than 90 degrees;
the third line section is closer to the air outlet side of the motor fan housing relative to the first line section; the inner diameter of the first wind guide disc keeps increasing from the first end of the third line segment to the second end of the third line segment; the first end of the third line segment is one end of the two endpoints of the third line segment, which is connected with the second line segment, and the second end of the third line segment is one end of the two endpoints of the third line segment, which is not connected with the second line segment;
the second line segment is a curve segment connecting the first line segment and the third line segment; from the second end of the first line segment to the first end of the third line segment, the inner diameter of the first air guide disc is in a decreasing trend;
the third line segment is a curved line segment, and an included angle between a tangent of a second end of the third line segment and the axis of the motor is greater than 0 degree and less than or equal to 60 degrees.
2. The motor fan cover according to claim 1, wherein the first line segment is parallel to a first outer contour line, the first outer contour line is an outer contour line of a radial portion of a cross section of the second wind deflector in the motor axis direction, and the second wind deflector is a wind deflector for mounting motor blades.
3. The motor fan housing of claim 1, wherein each line segment further comprises:
and the fourth line segment is connected with the first end of the first line segment and is parallel to the axis of the motor, and the fourth line segment and the second line segment are positioned at two sides of the first line segment.
4. A motor fan housing according to claim 3, wherein the coordinates (x, y) of each point on the first line segment conform to a first relationship:
y= 
in the formula (I), the compound is shown in the specification,
is an included angle between the extension line of the first line segment and the axis of the motor;
is the distance between the fourth line segment and the motor axis;
is the length of the fourth line segment; r4 is the arc radius corresponding to the second line segment; r2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor; the coordinate of the first end of the first line segment is (
，
) (ii) a The second end of the first line segment has the coordinate of (
，
) (ii) a The coordinate system adopted by the first relational expression takes the motor axis as a horizontal axis and takes a perpendicular line between the first end of the fourth line segment and the motor axis as a vertical axis; the first end of the fourth line segment is one of two endpoints of the fourth line segment which is not connected with the first line segment.
5. The motor fan cover according to claim 3, wherein the second line segment is a circular arc-shaped curve segment, and the coordinates (x, y) of each point on the second line segment satisfy the following second relation:
y=
4
in the formula, R4 is the arc radius corresponding to the second line segment; x3 is the abscissa of the first end of the third line segment; r2 is the distance between the connecting point of the second line segment and the third line segment and the axis of the motor;
the included angle between the extension line of the first line segment and the axis of the motor is formed;
is the distance between the fourth line segment and the motor axis;
is the length of the fourth line segment; the coordinate of the first end of the second line segment is (
，
) (ii) a The second end of the second line segment has coordinates of (A), (B)
，
）；x3= 
(ii) a The coordinate system adopted by the second relational expression takes the motor axis as a horizontal axis, a vertical line between the first end of the fourth line segment and the motor axis as a vertical axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment.
6. The motor fan housing according to claim 3, wherein the third line segment is a circular arc-shaped curve segment, and the coordinates (x, y) of each point on the third line segment satisfy a third relation:
y=
in the formula (I), the compound is shown in the specification,
the distance between the second end of the third line segment and the axis of the motor is obtained;
the distance between the connecting point of the second line segment and the third line segment and the axis of the motor is calculated; l2 is the horizontal distance between the connecting point between the second line segment and the third line segment and the second end of the third line segment; x3 is the abscissa of the first end of the third line segment;
is the distance between the fourth line segment and the motor axis;
the radius of the arc corresponding to the second line segment;
the included angle between the extension line of the first line segment and the axis of the motor is formed; first, theThe coordinates of the first end of the three line segments are (
，
) (ii) a The second end of the third line segment has the coordinate of (
）；x3= 
(ii) a The coordinate system adopted by the third relation takes the motor axis as a transverse axis, takes a perpendicular line between the first end of the fourth line segment and the motor axis as a longitudinal axis, and the first end of the fourth line segment is one of two end points of the fourth line segment which is not connected with the first line segment.
7. The motor fan housing as claimed in claim 1, wherein a connection line between a connection point between the second line segment and the third line segment and a position point of the maximum outer diameter of the motor fan is perpendicular to the motor axis.
8. The motor fan housing according to claim 1, further comprising a housing body provided with an air outlet, wherein a buckle is disposed on the housing body, a slot adapted to the buckle is disposed on an outer wall of the first wind guide plate, and the housing body and the first wind guide plate are connected to the slot through the buckle.
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|---|---|---|---|
| CN202211173791.9A CN115263815B (en) | 2022-09-26 | 2022-09-26 | Motor fan cover |
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| CN115263815B true CN115263815B (en) | 2023-02-03 |
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| CN106849504A (en) * | 2017-04-18 | 2017-06-13 | 湖州鸿远电机有限公司 | A kind of motor heat dissipation cooling structure |
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|---|---|---|---|---|
| CN103307722B (en) * | 2013-03-19 | 2015-09-02 | 海尔集团公司 | There is the vertical air conditioner air-supply arrangement of flow deflector |
| CN105697415A (en) * | 2016-04-14 | 2016-06-22 | 浙江亿利达风机股份有限公司 | Backward centrifugal wind wheel |
| CN112928849B (en) * | 2021-01-22 | 2022-02-15 | 珠海格力电器股份有限公司 | Motor fan cover and motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849504A (en) * | 2017-04-18 | 2017-06-13 | 湖州鸿远电机有限公司 | A kind of motor heat dissipation cooling structure |
| CN208581124U (en) * | 2017-12-15 | 2019-03-05 | 卧龙电气集团股份有限公司 | A kind of air inlet is the motor fan housing of regular hexagon |
| CN110165818A (en) * | 2019-02-17 | 2019-08-23 | 江苏世隆电机有限公司 | Air-cooled permanent magnet motor |
| CN110145849A (en) * | 2019-06-12 | 2019-08-20 | 珠海格力电器股份有限公司 | Ducting assembly and air purifier |
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| CN115263815A (en) | 2022-11-01 |
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