CN113217425A - Magnetic suspension air blower with axial bearing heat dissipation channel - Google Patents

Abstract

The invention relates to the field of magnetic suspension air blowers, in particular to a magnetic suspension air blower with an axial bearing heat dissipation channel. Comprises a shell, a motor shaft, a radial bearing and an axial bearing; the axial bearing comprises a thrust disc, an axial bearing stator combination and a bearing outer ring; the axial bearing stator combination comprises a first bearing stator and a second bearing stator; the first bearing stator is provided with a heat dissipation hole, and the second bearing stator is provided with a heat dissipation groove; a first heat dissipation gap is formed between two side faces of the lower end of the thrust disc and the corresponding inner side face of the bearing outer ring, and a second heat dissipation gap is formed between two side faces of the upper end of the thrust disc and the corresponding inner side face of the second bearing stator; the bearing outer ring is provided with a first cavity and a second cavity, the first heat dissipation gap, the heat dissipation groove and the second heat dissipation gap are respectively communicated with the first cavity, and the second heat dissipation gap is communicated with the second cavity. The bearing is internally provided with a heat dissipation air path, and the temperature of a stator and a winding of the thrust bearing is reduced by utilizing the high-speed rotation of the thrust disc to drive airflow to flow.

Description

Magnetic suspension air blower with axial bearing heat dissipation channel

Technical Field

The invention relates to the field of magnetic suspension air blowers, in particular to a magnetic suspension air blower with an axial bearing heat dissipation channel.

Background

The magnetic suspension blower is a mechanical device for conveying gas, and adopts core technologies such as a magnetic suspension bearing, a three-dimensional flow impeller, a high-speed permanent magnet synchronous motor, a high-efficiency frequency converter speed regulation, intelligent monitoring control and the like, when the magnetic suspension blower is started, the magnetic suspension blower is suspended firstly and then rotates, no friction and no lubrication are needed, the three-dimensional flow impeller and a rotor are directly connected, and zero transmission loss is realized. The magnetic suspension air blower utilizes an active magnetic suspension bearing system to carry out non-contact and non-abrasion suspension support on the magnetic suspension bearing rotating inside through controllable electromagnetic force, the magnetic suspension bearing is directly connected with the impeller, and zero transmission loss is realized, so that the effects of successfully conveying gas, no abrasion inside the machine, low noise, no lubrication and the like are achieved.

The Chinese utility model patent application (publication No. CN211116711U, published: 20200728) discloses a magnetic suspension centrifugal blower, which comprises a blower body; the blower body comprises a rotating shaft, a permanent magnet synchronous motor for driving the rotating shaft to rotate, a magnetic suspension system for controlling the rotating shaft to suspend, a first auxiliary bearing arranged close to the first end of the rotating shaft, and a second auxiliary bearing arranged close to the second end of the rotating shaft; the first end of the rotating shaft is used for connecting the first impeller, and the second end of the rotating shaft is used for connecting the second impeller; the blower body further comprises a first filtering baffle arranged between the first impeller and the first auxiliary bearing, and a second filtering baffle arranged between the second impeller and the second auxiliary bearing. This application can improve centrifugal blower filtration imperfection, blocks centrifugal blower's internal mechanism easily, has improved magnetic suspension centrifugal blower's filtration efficiency, and then has improved centrifugal blower's overall efficiency.

The prior art has the following defects: the axial bearing space of the magnetic bearing is narrow, active heat dissipation is avoided, and heat dissipation can be realized only by heat conduction; the axial bearing stator combination is made of pure iron and has general heat conducting performance, so that the axial bearing assembly has high working temperature, and the winding is easily burnt under a heavy load working condition to cause accidents.

Disclosure of Invention

The purpose of the invention is: in order to solve the problems, the magnetic suspension blower with the axial bearing heat dissipation channel is provided, wherein the heat dissipation wind path is arranged in the bearing, and the thrust disc rotates at a high speed to drive airflow to flow so as to reduce the temperature of a thrust bearing stator and a winding.

In order to achieve the purpose, the invention adopts the following technical scheme:

a magnetic suspension blower with an axial bearing heat dissipation channel comprises a casing, a motor shaft, a radial bearing and an axial bearing; the axial bearing comprises a thrust disc, an axial bearing stator combination and a bearing outer ring; the axial bearing stator combination comprises a first bearing stator and a second bearing stator; the first bearing stator is provided with heat dissipation holes penetrating along the left-right direction, the second bearing stator is provided with heat dissipation grooves distributed along the up-down direction and concave inwards, and the upper ends of the heat dissipation grooves are communicated with the outside through the heat dissipation holes; a first heat dissipation gap is formed between two side faces of the lower end of the thrust disc and the corresponding inner side face of the bearing outer ring, and a second heat dissipation gap is formed between two side faces of the upper end of the thrust disc and the corresponding inner side face of the second bearing stator; the bearing outer ring is provided with a first cavity and a second cavity communicated with the outside, the upper end of a first heat dissipation gap, the lower end of a heat dissipation groove and the lower end of a second heat dissipation gap are respectively communicated with the first cavity, and the upper end of the second heat dissipation gap is communicated with the second cavity. The second cavity comprises a vertical cavity and a horizontal cavity, the lower end of the vertical cavity is communicated with the upper end of the second heat dissipation gap, and the upper end of the vertical cavity is communicated with the outside through the horizontal cavity.

Preferably, the vertical cavity is located below the center of symmetry of the horizontal cavity.

Preferably, the heat dissipation holes and the heat dissipation grooves are multiple, and the heat dissipation holes and the heat dissipation grooves are distributed in a circular shape and correspond to each other.

Preferably, the circle centers of the plurality of heat dissipation holes and the plurality of heat dissipation grooves in circular distribution are the same as the circle center of the thrust disc.

Preferably, the motor shaft comprises a first shaft section and two second shaft sections which are respectively positioned at the outer sides of the two ends of the first shaft section; a permanent magnet is arranged in the first shaft section, a copper-clad layer is arranged on the surface of the first shaft section, and the first shaft section is connected with the driving end of the stator; the two second shaft sections are connected with the axial bearing supporting end and the radial bearing supporting end.

Preferably, the two second shaft sections are axially symmetrically distributed along the first shaft section.

Preferably, the copper-clad layer comprises a concave part in the middle and convex parts on two sides, and the width of the concave part is the same as that of the driving end of the stator.

Preferably, a relief groove is provided between the first shaft section and the second shaft section.

Preferably, the outer surface of the second shaft section on one side of the first shaft section is sleeved with punching sheets which are mutually stacked and attached in the axial direction, and the punching sheets are connected with the sensing end of the axial sensor.

Preferably, the motor shaft further comprises third shaft sections, the two third shaft sections are located on the outer sides of the two second shaft sections respectively, and the outer surfaces of the two third shaft sections are matched with the two radial protection bearing inner rings.

The magnetic suspension blower with the axial bearing heat dissipation channel, which adopts the technical scheme, has the advantages that:

the thrust disc drives airflow to flow when rotating at a high speed, external airflow respectively enters the first cavity along the first heat dissipation gap and sequentially enters the first cavity along the heat dissipation holes and the heat dissipation grooves, and then the airflow in the first cavity enters the second cavity along the second heat dissipation gap and flows to the outside of the bearing, so that the airflow flowing process is completed; the heat dissipation air path is formed in the air flow flowing process, the temperature of a thrust bearing stator and a winding is obviously reduced, and the thrust bearing assembly can work safely and stably under a better working condition.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the axial bearing.

Fig. 3 is a schematic structural view of the first bearing stator.

Fig. 4 is a schematic structural view of the second bearing stator.

L1-cooling air duct.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

1-4, the magnetic suspension blower with the axial bearing heat dissipation channel comprises a casing, a motor shaft 3, a radial bearing and an axial bearing; the axial bearing comprises a thrust disc 1, an axial bearingstator combination 2 and a bearing outer ring 4; the axial bearingstator assembly 2 comprises a first bearingstator 21 and a second bearingstator 22; the first bearingstator 21 is provided withheat dissipation holes 23 penetrating along the left-right direction, the second bearingstator 22 is provided withheat dissipation grooves 24 distributed along the up-down direction and recessed inwards, and the upper ends of theheat dissipation grooves 24 are communicated with the outside through theheat dissipation holes 23; a firstheat dissipation gap 11 is formed between two side faces of the lower end of the thrust disc 1 and the corresponding inner side face of the bearing outer ring 4, and a secondheat dissipation gap 12 is formed between two side faces of the upper end of the thrust disc 1 and the corresponding inner side face of the second bearingstator 22; the bearing outer ring 4 is provided with a first cavity 41 and asecond cavity 42 communicated with the outside, the upper end of the firstheat dissipation gap 11, the lower end of theheat dissipation groove 24 and the lower end of the secondheat dissipation gap 12 are respectively communicated with the first cavity 41, and the upper end of the secondheat dissipation gap 12 is communicated with thesecond cavity 42. Thesecond cavity 42 includes avertical cavity 43 and ahorizontal cavity 44, a lower end of thevertical cavity 43 is communicated with an upper end of the secondheat dissipation gap 12, and an upper end of thevertical cavity 43 is communicated with the outside through thehorizontal cavity 44. When the thrust disc rotates at a high speed, the thrust disc drives airflow to flow, external airflow respectively enters the first cavity 41 along the firstheat dissipation gap 11 and sequentially enters the first cavity 41 along theheat dissipation holes 23 and theheat dissipation grooves 24, and then the airflow in the first cavity 41 enters thesecond cavity 42 along the secondheat dissipation gap 12 and flows to the outside of the bearing, so that the airflow flowing process is completed; the heat dissipation air path is formed in the air flow flowing process, the temperature of a thrust bearing stator and a winding is obviously reduced, and the thrust bearing assembly can work safely and stably under a better working condition.

Thevertical cavity 43 is located below the center of symmetry of thehorizontal cavity 44. The plurality ofheat dissipation holes 23 and the plurality ofheat dissipation grooves 24 are provided, and the plurality ofheat dissipation holes 23 and the plurality ofheat dissipation grooves 24 are distributed in a circular shape and correspond to each other. The circle centers of the plurality ofheat dissipation holes 23 and the plurality ofheat dissipation grooves 24 are the same as the circle center of the thrust disc 1.

The motor shaft 3 comprises a first shaft section 31 and twosecond shaft sections 32 which are respectively positioned at the outer sides of two ends of the first shaft section 31; a permanent magnet is arranged inside the first shaft section 31, a copper-clad layer is arranged on the surface of the first shaft section 31, and the first shaft section 31 is connected with the driving end of the stator; the twosecond shaft sections 32 engage the axial bearing support end and the radial bearing support end. The copper-clad layer and the motor shaft are integrated, the mechanical property is excellent, and the limit of the rotating speed and the power of the motor is greatly improved. The heat conductivity of copper is 10 times higher than that of carbon fiber and 6.5 times higher than that of nickel-based alloy, and the heat dissipation of the motor is greatly improved.

The twosecond shaft sections 32 are axially symmetrically distributed along the first shaft section 31. The copper-clad layer comprises a lower concave part positioned in the middle and convex parts positioned on two sides, and the width of the lower concave part is the same as that of the driving end of the stator. A relief groove is provided between the first shaft section 31 and thesecond shaft section 32.

The outer surface of thesecond shaft section 32 on one side of the first shaft section 31 is thermally sleeved with punching sheets which are mutually stacked and attached in the axial direction, and the punching sheets are connected with the sensing end of the axial sensor so as to detect the axial position of the motor shaft 3. The motor shaft 3 further comprisesthird shaft segments 39, the twothird shaft segments 39 are respectively located outside the twosecond shaft segments 32, and the outer surfaces of the twothird shaft segments 39 are matched with the two radial protective bearing inner rings. When the blower is powered off, the magnetic force provided by the radial bearing and the axial bearing disappears, and the motor shaft 3 is supported by dropping to the radial protection bearing position to prevent the motor shaft 3 from being damaged by dropping suddenly.

Claims (10)

1. A magnetic suspension blower with an axial bearing heat dissipation channel comprises a casing, a motor shaft (3), a radial bearing and an axial bearing; the axial bearing comprises a thrust disc (1), an axial bearing stator combination (2) and a bearing outer ring (4); the axial bearing stator combination (2) is characterized by comprising a first bearing stator (21) and a second bearing stator (22); the first bearing stator (21) is provided with heat dissipation holes (23) penetrating along the left-right direction, the second bearing stator (22) is provided with heat dissipation grooves (24) distributed along the up-down direction and concave inwards, and the upper ends of the heat dissipation grooves (24) are communicated with the outside through the heat dissipation holes (23); a first heat dissipation gap (11) is formed between two side faces of the lower end of the thrust disc (1) and the corresponding inner side face of the bearing outer ring (4), and a second heat dissipation gap (12) is formed between two side faces of the upper end of the thrust disc (1) and the corresponding inner side face of the second bearing stator (22); the bearing outer ring (4) is provided with a first cavity (41) and a second cavity (42) communicated with the outside, the upper end of the first heat dissipation gap (11), the lower end of the heat dissipation groove (24) and the lower end of the second heat dissipation gap (12) are respectively communicated with the first cavity (41), and the upper end of the second heat dissipation gap (12) is communicated with the second cavity (42); the second cavity (42) comprises a vertical cavity (43) and a horizontal cavity (44), the lower end of the vertical cavity (43) is communicated with the upper end of the second heat dissipation gap (12), and the upper end of the vertical cavity (43) is communicated with the outside through the horizontal cavity (44).

2. Magnetic levitation blower with axial bearing heat dissipation channel as recited in claim 2, characterized in that the vertical cavity (43) is located below the symmetry center of the horizontal cavity (44).

3. The maglev blower with axial bearing heat dissipation channels according to claim 1, wherein the heat dissipation holes (23) and the heat dissipation grooves (24) are multiple, and the multiple heat dissipation holes (23) and the multiple heat dissipation grooves (24) are distributed in a circular shape and correspond to each other.

4. The magnetic suspension blower with the axial bearing heat dissipation channel as recited in claim 1, characterized in that the circle center of the circular distribution of the plurality of heat dissipation holes (23) and the plurality of heat dissipation grooves (24) is the same as the circle center of the thrust disc (1).

5. The maglev blower with axial bearing heat dissipation channels according to claim 1, characterized in that the motor shaft (3) comprises a first shaft section (31), two second shaft sections (32) respectively located outside both ends of the first shaft section (31); a permanent magnet is arranged in the first shaft section (31), a copper-clad layer is arranged on the surface of the first shaft section (31), and the first shaft section (31) is connected with the driving end of the stator; two second shaft sections (32) are engaged with the axial bearing support end and the radial bearing support end.

6. The maglev blower with axial bearing heat dissipation channels according to claim 5, characterized in that the two second shaft sections (32) are axially symmetrically distributed along the first shaft section (31).

7. The maglev blower with the axial bearing heat dissipation channel as claimed in claim 5, wherein the copper-clad layer comprises a concave portion in the middle and convex portions on two sides, and the width of the concave portion is the same as that of the driving end of the stator.

8. The maglev blower with axial bearing heat dissipation channels according to claim 5, characterized in that a relief is provided between the first shaft section (31) and the second shaft section (32).

9. The magnetic suspension blower with the axial bearing heat dissipation channel is characterized in that the outer surface of the second shaft section (32) on one side of the first shaft section (31) is thermally sleeved with punching sheets which are axially stacked and attached to each other, and the punching sheets are connected with the sensing end of the axial sensor.

10. The maglev blower with axial bearing cooling channels according to claim 5, characterized in that the motor shaft (3) further comprises third shaft segments (39), two third shaft segments (39) are respectively located outside the two second shaft segments (32), and the outer surfaces of the two third shaft segments (39) are matched with the two radial protection bearing inner rings.

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