CN112160981B

CN112160981B - Axial bearing rotor, axial bearing, motor and compressor

Info

Publication number: CN112160981B
Application number: CN202010869817.8A
Authority: CN
Inventors: 张小波; 闫瑾; 贾金信; 苏久展; 刘鹏辉; 吕双祥
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2022-02-11
Anticipated expiration: 2040-08-26
Also published as: CN112160981A

Abstract

The application provides an axial bearing rotor, an axial bearing, a motor and a compressor. This axial bearing rotor includes rotor body (1), and rotor body (1) is provided with a plurality of tonifying qi passageways (2) along circumference, and the first end of tonifying qi passageway (2) extends to the outer peripheral face of rotor body (1), and the second end of tonifying qi passageway (2) extends to the terminal surface of rotor body (1), and the direction of admitting air of tonifying qi passageway (2) is opposite with the direction of rotation of rotor body (1). According to the axial bearing rotor, the bearing capacity of the axial bearing can be increased without introducing external equipment, the stability of an axial system is improved, the bearing structure is simplified, the weight of the bearing is reduced, and the cooling effect of the axial bearing is improved.

Description

Axial bearing rotor, axial bearing, motor and compressor

Technical Field

The application relates to the technical field of air compression, in particular to an axial bearing rotor, an axial bearing, a motor and a compressor.

Background

The current aerodynamic axial bearing structure includes a two-sided bearing housing, a two-sided aerodynamic bearing stator, and an aerodynamic bearing rotor (also referred to as a thrust disc).

The air dynamic pressure bearing has the working principle that a wedge-shaped space is formed by a part and the top surface of a bearing stator through design, air is brought into the wedge-shaped space by a bearing rotor rotating at a high speed due to the viscosity of the wedge-shaped space and the air, and the air generates pressure or thrust due to the change of the flow cross section area; the radial air bearing naturally forms a wedge-shaped area due to the structural characteristics, and a bearing stator and a bearing rotor of the axial bearing are generally designed to be planes, so that the axial dynamic pressure air bearing has lower bearing capacity and poorer stability compared with the radial bearing.

At present, in order to solve the defects of low axial bearing capacity and poor stability, a common mode is that an air inlet is added on a bearing seat to achieve the combination of a static pressure air bearing and a dynamic pressure air bearing, so that the problems of insufficient bearing capacity of the axial dynamic pressure bearing at low rotating speed and poor stability at high speed are solved, but an air inlet structure, air inlet equipment and filter equipment are additionally introduced into the structure, the integral structure is complex, the system weight is increased, and the structure is not suitable for being used in the field with small and light weight requirements.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide an axial bearing rotor, an axial bearing, a motor and a compressor, the bearing capacity of the axial bearing can be increased without introducing external equipment, the stability of an axial system is improved, the bearing structure is simplified, the weight of the bearing is reduced, and the cooling effect of the axial bearing is improved.

In order to solve the problem, the application provides an axial bearing rotor, including rotor body, rotor body is provided with a plurality of tonifying qi passageways along circumference, and the first end of tonifying qi passageway extends to rotor body's outer peripheral face, and the second end of tonifying qi passageway extends to rotor body's terminal surface, and the direction of admitting air of tonifying qi passageway is opposite with rotor body's direction of rotation.

Preferably, the plurality of air supply channels are arranged at intervals along the circumferential direction of the rotor body and are divided into two groups, the first group of air supply channels extend to the first end face of the rotor body, and the second group of air supply channels extend to the second end face of the rotor body.

Preferably, the air replenishing channels of the first group and the air replenishing channels of the second group are alternately arranged along the circumferential direction in a one-to-one correspondence manner.

Preferably, the first end of the at least one air supply channel comprises an air inlet, the second end comprises at least two air outlets, the at least two air outlets at the second end are communicated with the air inlet at the first end, the first one of the at least two air outlets is located on the first end face of the rotor body, and the second one of the at least two air outlets is located on the second end face of the rotor body.

Preferably, a first air outlet and a second air outlet of the at least two air outlets are correspondingly arranged along the circumferential direction; or the first air outlet and the second air outlet of the at least two air outlets are arranged along the circumferential direction in a staggered manner.

Preferably, a plurality of air supply channels are arranged at intervals along the circumferential direction of the rotor body, and the air outlets of the air supply channels are positioned on the same end face of the rotor body.

Preferably, the air supplement channel comprises a guide groove arranged on the end face of the rotor body.

Preferably, the depth of the channels at the ends decreases in the direction of flow of the gas stream.

Preferably, the diversion trench is a straight trench or an arc trench.

Preferably, the guiding gutter includes a straight gutter section and an arc gutter section, the straight gutter section is located the front end of the air intake direction of the guiding gutter, the arc gutter section is located the rear end of the air intake direction of the guiding gutter, and the arc gutter section is connected with the straight gutter section.

Preferably, the air inlet of the air supply channel is located on the peripheral surface of the rotor body, the air outlet of the air supply channel is located on the end surface of the rotor body, the air supply channel extends to the air outlet from the air inlet through the inside of the rotor body, and a preset distance is reserved between the channel wall of the air supply channel and the end surface of the rotor body.

Preferably, the air supply passage is a straight hole or an arc-shaped hole.

Preferably, the cross-section of the gas compensation channel is circular, elliptical or polygonal.

Preferably, the cross-sectional area of the gas-supply passage decreases in the flow direction of the gas flow.

Preferably, the ratio of the cross-sectional area of the air outlet to the cross-sectional area of the air inlet is in the range of 0.3-0.8.

According to another aspect of the present application, there is provided an axial bearing comprising an axial bearing rotor as described above.

According to another aspect of the present application, there is provided an electric machine comprising an axial bearing rotor as described above.

According to another aspect of the present application, there is provided a compressor including an axial bearing rotor as described above.

The application provides an axial bearing rotor, including rotor body, rotor body is provided with a plurality of tonifying qi passageways along circumference, and the first end of tonifying qi passageway extends to rotor body's outer peripheral face, and the second end of tonifying qi passageway extends to rotor body's terminal surface, and the direction of admitting air of tonifying qi passageway is opposite with rotor body's rotation direction. The air supplement channel with the air inlet direction opposite to the rotation direction of the rotor body is additionally arranged on the axial bearing rotor, so that the outer peripheral surface of the axial bearing rotor is communicated with the air gap on the side of the bearing surface of the axial bearing, when the rotating shaft operates, the air is forced to enter the air supplement channel by the aid of the rotation action of the axial bearing rotor, the air enters the air gap at the end part of the axial bearing rotor through the air supplement channel, air is supplemented to the air gap position, bearing capacity of the axial bearing is effectively increased, stability of the axial bearing is improved, meanwhile, due to the continuous rotation action of the axial bearing rotor, external air can be continuously supplemented to the air gap position, forced air cooling is formed on the axial bearing, even heat in the air gap is taken away, and cooling effect of the axial bearing is improved. Because the gas flow of the application is realized by the rotation of the axial bearing rotor, external equipment does not need to be introduced, the complexity of the system and the whole weight of the axial bearing do not need to be additionally increased, and the light weight and the miniaturization of the axial bearing can be more conveniently realized.

Drawings

Fig. 1 is a perspective view of an axial bearing rotor according to an embodiment of the present application;

FIG. 2 is a side view block diagram of an axial bearing rotor according to an embodiment of the present application;

fig. 3 is a sectional structural view of an axial bearing rotor according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotor body; 2. a gas supply channel; 3. an air inlet; 4. and an air outlet.

Detailed Description

Referring to fig. 1 to 3 in combination, according to an embodiment of the present application, the axial bearing rotor includes a rotor body 1, the rotor body 1 is provided with a plurality of air supply channels 2 along a circumferential direction, a first end of each air supply channel 2 extends to an outer circumferential surface of the rotor body 1, a second end of each air supply channel 2 extends to an end surface of the rotor body 1, and an air intake direction of each air supply channel 2 is opposite to a rotation direction of the rotor body 1.

The air supplement channel with the air inlet direction opposite to the rotation direction of the rotor body is additionally arranged on the axial bearing rotor, so that the outer peripheral surface of the axial bearing rotor is communicated with the air gap on the side of the bearing surface of the axial bearing rotor, when the rotating shaft operates, air is forced to enter the air supplement channel by the aid of the rotation action of the axial bearing rotor, the air enters the air gap at the end part of the bearing rotor through the air supplement channel, air is supplemented to the air gap position, bearing capacity of the axial bearing is effectively increased, and stability of the axial bearing is improved.

Axial bearing moves because axial bearing rotor external diameter is great, and the working gap between axial bearing stator and rotor is very little, leads to producing great wind and rubs the loss, and the temperature rise is violent in the air gap, after adopting the axial bearing rotor of this application, because the continuous rotation effect of bearing rotor, can make outside air constantly mend air gap position department, form forced air cooling to axial bearing, even take away the heat in the air gap, improve axial bearing's cooling effect. Because the gas flow of the application is realized by the rotation of the axial bearing rotor, external equipment does not need to be introduced, the complexity of the system and the whole weight of the bearing do not need to be additionally increased, and the light weight and the miniaturization of the axial bearing can be more conveniently realized.

When the axial bearing is unstable or the air film between the bearing rotor and the stator is broken and fails due to the impact on the rotating shaft, the bearing rotor and the stator can rub at a high speed to cause bearing damage before the air film is generated again in the axial bearing in the prior art. After adopting the axial bearing rotor of this application, as long as the pivot is at high-speed rotation, even the air film breaks, under the tonifying qi effect of axial bearing rotor, still can produce axial holding power, simultaneously to the supplementary gas in the air gap fast for the formation of new air film, shorten the contact time of axial bearing stator and rotor, make the bearing damage obtain effective control.

The axial bearing is an aerodynamic axial bearing.

In one embodiment, the plurality of air supplement channels 2 are arranged at intervals along the circumferential direction of the rotor body 1 and divided into two groups, the first group of air supplement channels 2 extends to the first end face of the rotor body 1, and the second group of air supplement channels 2 extends to the second end face of the rotor body 1. In this embodiment, two sets of tonifying qi passageways 2 are used for tonifying qi respectively to the air gap of rotor body 1's different terminal surfaces department, first group tonifying qi passageway 2 is used for tonifying qi the air gap of rotor body 1's first end terminal surface department, second group tonifying qi passageway 2 is used for tonifying qi the air gap of rotor body 1's second end terminal surface department, make rotor body 1's both ends can be tonified qi simultaneously, can all form stable lubricated air film at rotor body 1's both ends, improve the stability of axial bearing during operation.

In addition, because the air supplementing channels 2 in the embodiment are arranged in groups, each group of air supplementing channels 2 supplements air to different air gaps, the air supplementing channels 2 at two ends of the rotor body 1 are isolated from each other, no influence is generated between the air supplementing channels, and the air supplementing stability and effectiveness are improved.

In an alternative embodiment, the air make-up passages 2 of the first group are circumferentially alternately arranged in a one-to-one correspondence with the air make-up passages 2 of the second group. In this embodiment, an arbitrary tonifying qi passageway 2 of first group is located between two adjacent tonifying qi passageways 2 of second group, an arbitrary tonifying qi passageway 2 of second group is located between two adjacent tonifying qi passageways 2 of first group, make two sets of tonifying qi passageways 2 homoenergetic along rotor body 1's circumference evenly arrange, make the air current distribution in the air gap at rotor body 1 both ends more even, be favorable to forming even lubricated air film more, axial bearing's work is more stable. Simultaneously, because two sets of tonifying qi passageways 2 arrange along rotor body 1's circumference in turn, consequently can not cause great influence to rotor body 1's structural strength itself, can effectively guarantee rotor body 1's structural strength itself.

In another optional embodiment, the first set of air supplement channels 2 may be disposed at the first end of the rotor body 1, the second set of air supplement channels 2 may be disposed at the second end of the rotor body 1, and the two sets of air supplement channels 2 are disposed along the circumferential direction and disposed along the axial direction at intervals, so that the two sets of air supplement channels 2 can supplement air to the corresponding air gaps simultaneously, and do not interfere with each other, thereby the operation is more stable.

In one embodiment, the first end of the at least one air supplement channel 2 comprises an air inlet 3, the second end comprises at least two air outlets 4, the at least two air outlets 4 at the second end are communicated with the air inlet 3 at the first end, a first one of the at least two air outlets 4 is located on the first end surface of the rotor body 1, and a second one of the at least two air outlets 4 is located on the second end surface of the rotor body 1. In this embodiment, one air supply channel 2 includes at least two air outlets 4, so that air can be supplied to the air gaps at the two ends of the rotor body 1 through one air supply channel 2, the number of the air supply channels 2 can be reduced, and the air supply effect to the air gaps at the two ends of the rotor body 1 is not affected.

In an alternative embodiment, the first air outlet 4 and the second air outlet 4 of the at least two air outlets 4 are arranged along the circumferential direction.

In another alternative embodiment, the first air outlet 4 and the second air outlet 4 of the at least two air outlets 4 are arranged in a circumferentially staggered manner.

A plurality of tonifying qi passageway 2 are arranged along rotor body 1's circumference interval, and the gas outlet 4 of each tonifying qi passageway 2 is located rotor body 1's same terminal surface.

In one embodiment, the air supplement channel 2 comprises flow guide grooves arranged on the end surface of the rotor body 1. In this embodiment, the air supply channel 2 is a flow guide groove formed in the end surface of the rotor body 1, and the flow guide groove is open on the rotor body 1, so that after the air flow enters the rotor body 1 from the outer peripheral surface of the rotor body 1, the air flow can be continuously supplied to the air gap from the opening of the flow guide groove on the rotor body 1.

In an alternative embodiment, the depth of the guide grooves at the end decreases in the flow direction of the gas flow, so that the gas flow is continuously compressed in the process of flowing towards the end of the guide grooves, increasing the gas pressure entering the air gap, and thus enhancing the bearing capacity of the axial bearing.

The guide grooves are, for example, straight grooves or arc-shaped grooves, and the bottom walls of the straight grooves can be inclined relative to the end surfaces of the rotor body 1, so that the depths of the guide grooves decrease along the direction close to the side end surfaces of the guide grooves, and a good gas compression effect can be formed. The arc-shaped slot also has a similar effect to the straight slot.

In one embodiment, the baffle box includes a straight channel section located at a front end of the inlet direction of the baffle box and an arc channel section located at a rear end of the inlet direction of the baffle box, the arc channel section being connected to the straight channel section. In this embodiment, the diversion trench is a combination of a straight trench section and an arc trench section, the straight trench section is convenient for introducing the airflow, and the arc trench can enable the airflow entering from the straight trench section to smoothly flow to the air gap, so as to reduce the airflow resistance.

In one embodiment, the air inlet 3 of the air supply channel 2 is located on the outer circumferential surface of the rotor body 1, the air outlet 4 of the air supply channel 2 is located on the end surface of the rotor body 1, the air supply channel 2 extends from the air inlet 3 to the air outlet 4 through the interior of the rotor body 1, and a preset distance is formed between the channel wall of the air supply channel 2 and the end surface of the rotor body 1.

In this embodiment, except for air inlet 3 and gas outlet 4, whole tonifying qi passageway 2 all is located the inside of axial bearing rotor for the air current is entering into the in-process that flows out from gas outlet 4 from air inlet 3, can not take place to leak, and can only get into by air inlet 3 on the outer peripheral face of rotor body 1, flow out through gas outlet 4 on the terminal surface of rotor body 1, improved the air current utilization efficiency, make the air current can be carried to the air gap department more intensively, play good tonifying qi and cooling effect.

In one embodiment, the plurality of air supply channels 2 may be uniformly spaced along the circumferential direction, the air outlets 4 of the partial air supply channels 2 are located on the first end face of the rotor body 1, the air outlets 4 of the partial air supply channels 2 are located on the end face of the second end of the rotor body 1, the air supply channels 2 of the air outlets 4 located on the first end face of the rotor body 1 and the air supply channels 2 of the air outlets 4 located on the end face of the second end of the rotor body 1 are alternately arranged along the circumferential direction of the rotor body 1, so as to form air supply paths which are uniformly distributed, and improve air supply uniformity.

In another embodiment, a plurality of air supply channels 2 can be uniformly arranged along the circumferential direction at intervals, each air supply channel 2 comprises two air outlets 4, one air outlet 4 is located on the first end face of the rotor body 1, the other air outlet 4 is located on the second end face of the rotor body 1, the two air outlets 4 belonging to the same air supply channel 2 can be correspondingly arranged along the circumferential direction, and can also be arranged along the circumferential direction in a staggered manner, and because the two air outlets 4 are all supplied with air through the same air inlet 3, the pressures at the two ends of the axial bearing rotor can be more uniform.

The air supply channel 2 has a certain rotation direction, the direction of the air supply channel is opposite to the rotation direction of the axial bearing rotor, and the rotation direction of the air supply channel 2 can be designed according to the rotating speed of the motor and the size of the bearing rotor, so that the performance of the air supply channel is optimal. When the axial bearing rotor runs, because the rotating direction of the air supplementing channel 2 is opposite to the running direction, air on the outer surface of the bearing rotor can be forced to enter the air supplementing channel 2 through the air inlet 3, and then air is supplemented to air gaps at two ends of the rotor body 1 through the air supplementing channel 2 respectively.

The air supply channel 2 can be a straight hole or an arc hole. When tonifying qi passageway 2 was straight hole, can set up to the inclined hole for tonifying qi passageway 2 inclines along the direction that is close to rotor body 1's terminal surface from first end to the second end, thereby can form effective water conservancy diversion, makes things convenient for gaseous at rotor body 1's terminal surface to form the air gap.

The cross section of the air supply channel 2 is circular, oval or polygonal.

In one embodiment, the cross-sectional area of the gas supply channel 2 decreases in the direction of flow of the gas flow. Because the cross-section of tonifying qi passageway 2 sets up to diminishing gradually, can compress the exhaust to the air that inside passes through, then exhaust at axial bearing rotor both ends respectively, realize the function similar to static pressure air bearing, supplementary axial bearing suspension improves axial bearing capacity and stability.

When the axial bearing is subjected to axial impact to cause the air film to break, the rotating shaft still rotates at high speed at the moment, so that air still enters a gap between the bearing stator and the bearing rotor through the air supplementing channel to generate certain pressure for protecting the bearing stator and the bearing rotor from serious abrasion, and meanwhile, air is supplemented quickly to accelerate the generation of a new air film so as to restore the stability of a bearing system.

The ratio range of the sectional area of the air outlet 4 to the sectional area of the air inlet 3 is 0.3-0.8, so that the airflow entering the air supplementing channel 2 can obtain a proper compression ratio, stable and effective air supplementing of the air gap can be guaranteed, the airflow in the air gap can be forced to exchange air, and the air gap is effectively radiated.

According to an embodiment of the application, the axial bearing comprises an axial bearing rotor, which is the axial bearing rotor described above.

The axial bearing also comprises a bearing seat and axial bearing stators, the axial bearing stators are respectively arranged at the two ends of the axial bearing rotor, and air gaps are respectively formed between the axial bearing rotor and the axial bearing stators at the two ends.

According to an embodiment of the application, the electrical machine comprises an axial bearing rotor, which is the axial bearing rotor described above.

According to an embodiment of the application, the compressor comprises an axial bearing rotor, which is the axial bearing rotor described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The axial bearing rotor is characterized by comprising a rotor body (1), wherein the rotor body (1) is provided with a plurality of air supply channels (2) along the circumferential direction, the first ends of the air supply channels (2) extend to the peripheral surface of the rotor body (1), the second ends of the air supply channels (2) extend to the end surface of the rotor body (1), and the air inlet direction of the air supply channels (2) is opposite to the rotation direction of the rotor body (1); the air supply channels (2) are arranged at intervals along the circumferential direction of the rotor body (1) and are divided into two groups, the air supply channels (2) in the first group extend to the first end face of the rotor body (1), and the air supply channels (2) in the second group extend to the second end face of the rotor body (1).

2. The axial bearing rotor as recited in claim 1, characterized in that the air supply channels (2) of the first group alternate with the air supply channels (2) of the second group in the circumferential direction.

3. Axial bearing rotor according to claim 1, characterized in that the first end of at least one of said air make-up channels (2) comprises one air inlet (3) and the second end comprises at least two air outlets (4), said at least two air outlets (4) at the second end being in communication with said air inlet (3) at the first end, a first of said at least two air outlets (4) being located on a first end face of said rotor body (1) and a second of said at least two air outlets (4) being located on a second end face of said rotor body (1).

4. The axial bearing rotor as recited in claim 3, characterized in that a first outlet port (4) and a second outlet port (4) of the at least two outlet ports (4) are arranged in a circumferential direction; or a first air outlet (4) and a second air outlet (4) of the at least two air outlets (4) are arranged along the circumferential direction in a staggered manner.

5. The axial bearing rotor as recited in claim 1, characterized in that a plurality of said air supplement channels (2) are arranged at intervals along the circumference of said rotor body (1), and the air outlet (4) of each said air supplement channel (2) is located on the same end face of said rotor body (1).

6. The axial bearing rotor as recited in any one of claims 1-2, characterized in that the gas supply channel (2) comprises flow channels provided on an end face of the rotor body (1).

7. The axial bearing rotor of claim 6, wherein the depth of said channels at the ends decreases in the direction of flow of the air stream.

8. The axial bearing rotor of claim 7, wherein the flow guide slots are straight slots or arc slots.

9. The axial bearing rotor as recited in claim 7, wherein the guide groove includes a straight groove section located at a front end in an air intake direction of the guide groove and an arc-shaped groove section located at a rear end in the air intake direction of the guide groove, the arc-shaped groove section being connected to the straight groove section.

10. The axial bearing rotor as recited in any one of claims 1 to 5, characterized in that the air inlet (3) of the air supplement channel (2) is located on the outer peripheral surface of the rotor body (1), the air outlet (4) of the air supplement channel (2) is located on the end face of the rotor body (1), the air supplement channel (2) extends from the air inlet (3) to the air outlet (4) through the interior of the rotor body (1), and a preset distance is provided between the channel wall of the air supplement channel (2) and the end face of the rotor body (1).

11. Axial bearing rotor according to claim 10, characterised in that the gas supply channel (2) is a straight or an arc-shaped hole.

12. Axial bearing rotor according to claim 10, characterised in that the cross section of the gas compensation channel (2) is circular, oval or polygonal.

13. Axial bearing rotor according to claim 10, characterised in that the cross-sectional area of the gas compensation channel (2) decreases in the flow direction of the gas flow.

14. The axial bearing rotor as recited in claim 13, characterized in that the ratio of the cross-sectional area of the outlet opening (4) to the cross-sectional area of the inlet opening (3) ranges from 0.3 to 0.8.

15. An axial bearing comprising an axial bearing rotor, characterized in that the axial bearing rotor is an axial bearing rotor according to any one of claims 1 to 14.

16. An electrical machine comprising an axial bearing rotor, characterized in that the axial bearing rotor is an axial bearing rotor according to any one of claims 1 to 15.

17. A compressor comprising an axial bearing rotor, characterized in that the axial bearing rotor is as claimed in any one of claims 1 to 15.