Motor air outlet structure

Abstract

The invention discloses a motor air outlet structure, which comprises a base (6), a rotor (4) and a stator (3), the stator (3) is assembled on the inner wall of the base (6), and two ends of a rotating shaft (8) of the rotor (4) are respectively assembled on a front end cover (10) and a rear end cover (11) through bearings (9); an air inlet window (1) is formed in the rear end cover (11); a centrifugal fan (5) is assembled at the front part of the rotating shaft (8); an air outlet ring opening (2) is formed in the front part of the machine base (6) corresponding to the centrifugal fan (5); connecting rib plates (7) are evenly arranged in the air outlet ring opening (2), and the cross section of each connecting rib plate (7) is in a fluid raindrop shape. The connecting rib plates (7) deflect in the rotating air outlet direction. The air outlet ring opening (2) protrudes out of the surface of the machine base (6). The strength of the air outlet of the motor base is enhanced, the area of the air outlet of the motor base is increased, the structure influencing an air path is optimized, and loss and noise are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to an air outlet structure of a motor. Background Art

[0002] During the energy conversion process, the motor generates heat due to losses, which increases the temperature of the motor and affects the normal operation and insulation life of the motor. Self-ventilated motors are mostly cooled by centrifugal fans. The rotation of the fan generates a pressure difference, which in turn causes the air inside the motor to flow to form an air path, taking away the heat inside the motor, thereby reducing the temperature rise of the motor. However, the loss and noise generated by the motor fan are the main indicators that affect the motor. With the continuous improvement of green environmental protection requirements, the optimization design of the motor air path structure plays a vital role in improving the overall ventilation and heat dissipation capacity of the motor and reducing technical indicators such as loss and noise.

[0003] like Figure 1 and Figure 2 For self-ventilation cooling motors, centrifugal fans 5 are mostly used for cooling. The fan is coaxially installed with the motor rotor 4. When the motor rotates, the fan blades generate negative pressure, so that the cooling air enters the motor from the air inlet 1 at one end, cools the stator 3 and the rotor 4, and then is discharged from the air outlet 2 in the circumferential direction of the base. The traditional air outlet 2 is to process the window on the motor base 6 to discharge air. If the opening is too large, it will affect the overall strength of the base. If the opening is too small, it will affect the ventilation. In addition, the air outlet is blocked by the base 6, and the wind pressure is unstable, resulting in large eddy current loss and aerodynamic noise. For a unidirectional rotating motor, the fan direction is unidirectional, and the cooling air is blown out obliquely along the outer circle and the wind direction remains unchanged. Then the motor outlet structure can be improved and designed according to the air outlet direction.

[0004] The disadvantages of the existing generator outlet structure are as follows: (1) The outlet structure removes material from the base, which weakens the strength of the motor base cylinder. (2) The existing outlet window area is limited, which generates large wind resistance when the air is discharged, resulting in large ventilation losses. (3) Due to the obstruction of the base, the wind pressure of the existing outlet is unstable, resulting in large eddy current losses. (4) Due to the eddy current and wind resistance generated by the shape of the outlet, the aerodynamic noise is large. Summary of the invention

[0005] In order to overcome the above-mentioned defects in the prior art, the purpose of the present invention is to design a new type of motor air outlet structure.

[0006] The present invention is achieved by adopting the following technical solutions: A motor air outlet structure comprises a base, a rotor and a stator, wherein the stator is mounted on the inner wall of the base, and the two ends of the rotor shaft are respectively mounted on the front cover and the rear cover through bearings; the rear cover is provided with an air inlet window; a centrifugal fan is mounted on the front of the shaft, and an air outlet ring is arranged at the front of the base corresponding to the position of the centrifugal fan; connecting ribs are evenly arranged in the air outlet ring, and the cross-sectional shape of the connecting ribs is a fluid raindrop shape.

[0007] Further preferably, the connecting rib plate is deflected along the rotating air outlet direction and is parallel to the cooling air flow direction at the motor air outlet, thereby increasing the air outlet area.

[0008] Further preferably, the air outlet ring protrudes from the surface of the base, thereby increasing a buffer cavity and effectively reducing the rotation noise of the fan.

[0009] The technical solution provided by the present invention has the following advantages compared with the prior art: 1) The new air outlet structure not only increases the ventilation volume of the motor, but also increases the structural strength of the base.

[0010] 2) The air outlet of the new structure is designed along the air outlet direction, which greatly increases the air outlet area, increases the ventilation volume, and reduces the temperature rise of the motor.

[0011] 3) The cross-section of the air outlet rib plate of the new structure is in the shape of a fluid raindrop, which can effectively reduce wind resistance and eddy current loss.

[0012] 4) The enlarged air outlet and the new rib plate structure can reduce the wear between the cooling air and the machine base during air outlet and reduce the rotation noise.

[0013] 5) The new air outlet structure forms a cavity between the motor fan and the base rib plate, which can effectively reduce the aerodynamic noise of the motor.

[0014] 6) The new air outlet structure reduces motor cooling loss and improves motor efficiency.

[0015] The invention has reasonable design, which not only strengthens the strength of the air outlet of the motor base, but also increases the air outlet area of ​​the generator base, optimizes the structure affecting the wind path, reduces loss and noise, and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The figure shows the schematic diagram of the existing motor air outlet structure.

[0019] Figure 2 express Figure 1 AA section view.

[0020] Figure 3 A schematic diagram of the air outlet structure of the motor of the present invention is shown.

[0021] Figure 4 express Figure 3 AA section view.

[0022] Figure 5 A three-dimensional diagram showing the air outlet ring of the motor of the present invention.

[0023] Figure 6 A side view of the air outlet ring of the motor of the present invention is shown.

[0024] Figure 7 express Figure 6 AA section view.

[0025] Figure 8 A schematic cross-sectional view of the connecting rib plate of the present invention is shown.

[0026] In the figure: 1-air inlet window, 2-air outlet ring, 3-stator, 4-rotor, 5-centrifugal fan, 6-base, 7-connecting rib plate, 8-rotating shaft, 9-bearing, 10-front cover, 11-rear cover. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0028] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] A motor air outlet structure, such as Figure 3 , Figure 4 As shown, it includes a base 6, a rotor 4 and a stator 3. The stator 3 is mounted on the inner wall of the base 6. The two ends of the rotating shaft 8 of the rotor 4 are respectively mounted on the front cover 10 and the rear cover 11 through bearings 9; the rear cover 11 is provided with an air inlet window 1; the front of the rotating shaft 8 is equipped with a centrifugal fan 5, and the front of the base 6 is provided with an air outlet ring 2 corresponding to the position of the centrifugal fan 5. Connecting ribs 7 are evenly arranged in the air outlet ring 2, and the cross-sectional shape of the connecting ribs 7 is a fluid raindrop shape, such as Figure 8 In addition, the connecting rib plate 7 is deflected along the rotating air outlet direction, the purpose is to make the air outlet direction and the connecting rib plate 7 substantially parallel to each other, so as to increase the air outlet area. Figure 5 , Figure 6 As shown, the air outlet ring 2 protrudes from the surface of the base 6. The enlarged air outlet and the new rib plate structure can reduce the wear between the cooling air and the base during air outlet and reduce the rotation noise. In specific implementation, the length of the connecting rib plate 7 is 1 / 6 to 1 / 8 of the radius of the base 6. There is a buffer cavity with a width of 20-50mm between the outer diameter of the blade of the centrifugal fan 5 and the inner diameter of the connecting rib plate 7.

[0032] In the novel motor air outlet structure shown in the present invention, cooling air enters the motor from the air inlet window 1, cools the stator 3 and the rotor 4, and is then discharged from the air outlet ring 2 of the motor base 6 by the centrifugal fan 5. The inclination angle of the air outlet connection rib plate 7 is redesigned according to the air outlet direction, so that the rib plate is parallel to the air outlet direction, thereby increasing the air outlet area. The shape of the air outlet connection rib plate 7 is redesigned, and the cross section of the rib plate adopts a fluid raindrop-shaped structural design to reduce wind resistance and eddy current loss, while also effectively reducing the motor ventilation noise.

[0033] The structural design features of the present invention are as follows: (1) The present invention designs an air outlet structure that has little effect on the overall stiffness and strength of the machine base. The inclined rib design of the air outlet of the machine base increases the thickness of the connection of the air outlet of the machine base, thereby compensating for the effect of the air outlet on the overall stiffness and strength of the machine base.

[0034] (2) The present invention designs a new motor base air outlet structure, in which the connecting ribs are designed at an inclined angle.

[0035] (3) The present invention designs a new air outlet connecting rib plate structure, whose cross-section is designed to be in the shape of a water droplet fluid.

[0036] (4) The present invention designs an air outlet structure that can reduce the wind resistance of the air outlet. The inclination angle of the connecting rib plate of the air outlet of the machine base is designed to be parallel to the cooling air flow direction at the air outlet of the motor, thereby increasing the air outlet area.

[0037] (5) The present invention designs a motor air outlet structure that can effectively reduce noise. The connecting ribs at the air outlet are in a fluid shape with an inclined angle, which reduces wind resistance and eddy currents, thereby reducing the aerodynamic noise of the motor.

[0038] (6) The present invention designs a motor air outlet structure including a fluid shape, which can reduce wind resistance and increase motor ventilation volume, thereby reducing losses and improving efficiency.

[0039] (7) The air outlet structure designed in the present invention adds a buffer cavity between the outer circle of the fan blades and the air outlet ring of the base, which can effectively reduce the rotation noise of the fan.

[0040] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A motor air outlet structure, comprising a base (6), a rotor (4) and a stator (3), wherein the stator (3) is mounted on the inner wall of the base (6), and the two ends of the rotating shaft (8) of the rotor (4) are respectively mounted on the front cover (10) and the rear cover (11) through bearings (9); the rear cover (11) is provided with an air inlet window (1); a centrifugal fan (5) is mounted on the front of the rotating shaft (8), and an air outlet ring (2) is provided on the front of the base (6) at a position corresponding to the centrifugal fan (5); the characteristics are: Connecting ribs (7) are evenly arranged inside the air outlet ring (2), and the cross-sectional shape of the connecting ribs (7) is a fluid raindrop shape.

2. The motor air outlet structure according to claim 1, characterized in that: The connecting rib plate (7) is deflected along the rotating air outlet direction.

3. The motor air outlet structure according to claim 2, characterized in that: The air outlet ring (2) protrudes from the surface of the machine base (6).

4. A motor air outlet structure according to claim 2 or 3, characterized in that: The length of the connecting rib plate (7) is 1 / 6 to 1 / 8 of the radius of the machine base (6).

5. The motor air outlet structure according to claim 4, characterized in that: A buffer cavity with a width of 20-50 mm is provided between the outer diameter of the blades of the centrifugal fan (5) and the inner diameter of the connecting rib plate (7).

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