Motor and fan

Abstract

The fan comprises the motor, and the motor comprises a motor base, a rotating shaft, a first impeller, a thrust plate, an air bearing and a sealing ring. The machine base comprises a first installation cavity, a first overflowing channel and a second overflowing channel. The number of the air bearings is two, the two air bearings are arranged on the periphery of the rotating shaft in a sleeving mode and located on the two sides of the thrust plate respectively, a first gap is formed between the air bearing far away from the driving end and the thrust plate, and a second gap is formed between the air bearing close to the driving end and the thrust plate. The periphery of the thrust plate is sleeved with the sealing ring, a concave-convex structure is arranged on the side, close to the thrust plate, of the sealing ring, a third gap is formed between the outermost side of the concave-convex structure and the side wall of the periphery of the thrust plate, and the third gap is communicated with the first gap and the second gap. According to the motor and the fan, the problem that the air bearing is easy to damage when the bearing capacity of the motor is too large in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of heat dissipation devices, and in particular to a motor and a fan. Background Art

[0002] The bearing capacity of the more mature air bearing blowers on the market is usually between 200N and 300N, which is relatively small, and the axial bearing capacity of the matching air bearings on the market is also relatively low.

[0003] However, when the load-bearing capacity of the motor is too large, for example, when the load-bearing capacity of the motor is greater than 500N, the protective bearing may be unable to withstand the excessive load, thereby causing damage to the air bearing. Utility Model Content

[0004] The main purpose of the present application is to provide a motor and a fan, so as to at least solve the problem in the prior art that the air bearing is easily damaged when the bearing capacity of the motor is too large.

[0005] According to one aspect of the present application, there is provided a motor, comprising:

[0006] A machine base, the machine base comprising a first installation cavity, a first flow passage and a second flow passage;

[0007] A rotating shaft, the rotating shaft is rotatably mounted in the first mounting cavity, the rotating shaft has a driving end extending out of the base, and the driving end is used to connect with a driven member;

[0008] a first impeller connected to an end of the rotating shaft opposite to the driving end;

[0009] A thrust plate, wherein the thrust plate is fixedly sleeved on a side of the rotating shaft close to the driving end;

[0010] An air bearing, wherein the air bearings include two air bearings, the two air bearings are sleeved on the outer periphery of the rotating shaft and are respectively located on both sides of the thrust plate, wherein a first gap is provided between the air bearing far from the driving end and the thrust plate, the two ends of the first flow passage are respectively connected with the first gap and the first impeller, wherein a second gap is provided between the air bearing close to the driving end and the thrust plate, the first end of the second flow passage is connected with the second gap, and the second end of the second flow passage extends to the outside of the motor;

[0011] A sealing ring is sleeved on the outer circumference of the thrust plate, a concave-convex structure is provided on one side of the sealing ring close to the thrust plate, a third gap is provided between the outermost side of the concave-convex structure and the outer peripheral side wall of the thrust plate, and the third gap is respectively connected to the first gap and the second gap.

[0012] Furthermore, the concave-convex structure includes a plurality of raised portions and a plurality of recessed portions, and the plurality of raised portions and the plurality of recessed portions are alternately arranged in sequence along the axial direction of the rotating shaft.

[0013] Further, a minimum distance A between the side wall surface of the protrusion close to the thrust plate and the outer peripheral side wall of the thrust plate is smaller than a maximum recessed depth B of the recessed portion.

[0014] Further, along the direction in which the sealing ring moves away from the thrust plate, a width C of the recessed portion along the axial direction of the rotating shaft gradually decreases or remains unchanged.

[0015] Furthermore, the number of the recessed portions is n, and n satisfies the relationship: 4≤n≤35, n∈N + .

[0016] Further, the air bearing comprises a foil air bearing.

[0017] Further, along the axial direction of the rotating shaft, the thickness D of the sealing ring is less than or equal to the thickness E of the thrust plate.

[0018] Furthermore, the base also includes an end cover and a sealing plate, the sealing plate is fixedly connected to the end cover, and a second installation cavity is provided between the sealing plate and the end cover, the sealing ring is arranged in the second installation cavity and fixedly connected to the end cover and / or the sealing plate.

[0019] Furthermore, the air bearing comprises a first air bearing and a second air bearing, both of which are arranged in the second mounting cavity, and the first air bearing is fixedly connected to the end cover, and the second air bearing is fixedly connected to the sealing plate.

[0020] On the other hand, the present application also provides a fan, which includes the above-mentioned motor.

[0021] Compared with the prior art, the present application provides a sealing ring on the outer periphery of the thrust plate, and a concave-convex structure is provided on the side of the sealing ring close to the thrust plate, and a third gap is provided between the outermost side of the concave-convex structure and the outer peripheral side wall of the thrust plate. This means that when the airflow flows through the third gap from the second flow passage, due to the concave-convex structure on the sealing ring, the airflow generates a vortex in the concave part of the concave-convex structure, and the generation of the vortex causes the pressure of the airflow to decrease, and finally the pressure of the airflow flowing through the third gap is lower than the pressure of the airflow that does not flow through the third gap, thereby generating pressure between the high-pressure gas and the low-pressure gas, so that the air bearing away from the driving end is subjected to pressure to the left along the axial direction, reducing the effect of the load force of the motor on the air bearing, thereby avoiding damage to the air bearing under the action of a large load force to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A half-section diagram of the motor disclosed in the present application;

[0024] Figure 2 for Figure 1 Enlarged schematic diagram of the middle I area;

[0025] Figure 3 This is a schematic diagram of the concave-convex structure disclosed in this application.

[0026] The above drawings include the following reference numerals:

[0027] 10. Machine base; 11. Rotating shaft; 20. First impeller; 30. Second impeller; 40. Thrust plate; 50. Sealing ring; 51. Concave-convex structure; 60. Air bearing; 61. First air bearing; 62. Second air bearing; 71. First gap; 72. Second gap; 80. Third gap; 101. End cover; 102. Sealing plate; 103. First flow channel; 104. Second flow channel; 105. First installation cavity; 106. Second installation cavity; 511. Protrusion; 512. Recess. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] See also Figures 1 to 3 As shown, according to an embodiment of the present application, a motor is provided, including a base 10 , a rotating shaft 11 , a first impeller 20 , a thrust plate 40 , an air bearing 60 and a sealing ring 50 .

[0032] The base 10 includes a first installation cavity 105, a first flow passage 103 and a second flow passage 104. The rotating shaft 11 is rotatably installed in the first installation cavity 105, and the rotating shaft 11 has a driving end extending from the base 10, and the driving end is used to connect with the driven member. The first impeller 20 is connected to one end of the rotating shaft 11 opposite to the driving end, and the thrust plate 40 is fixedly sleeved on the side of the rotating shaft 11 close to the driving end. The air bearing 60 includes two, and the two air bearings 60 are sleeved on the outer periphery of the rotating shaft 11 and are respectively located on both sides of the thrust plate 40, and there is a first gap 71 between the air bearing 60 far from the driving end and the thrust plate 40, and the two ends of the first flow passage 103 are respectively connected to the first gap 71 and the first impeller 20, and there is a second gap 72 between the air bearing 60 close to the driving end and the thrust plate 40, and the first end of the second flow passage 104 is connected to the second gap 72, and the second end of the second flow passage 104 extends to the outside of the motor. The sealing ring 50 is sleeved on the outer periphery of the thrust plate 40. A concave-convex structure 51 is provided on the side of the sealing ring 50 close to the thrust plate 40. A third gap 80 is provided between the outermost side of the concave-convex structure 51 and the outer peripheral side wall of the thrust plate 40. The third gap 80 is connected to the first gap 71 and the second gap 72 respectively.

[0033] Specifically, when the motor starts, the rotating shaft 11 rotates and drives the first impeller 20 to rotate. Since the first impeller 20 is connected to the first installation cavity 105, and the first installation cavity 105 is connected to the first flow channel 103, the first impeller 20 generates negative pressure after high-speed rotation, so that air enters the motor from the second flow channel 104, and forms a high-pressure air film in the first gap 71 and the second gap 72 respectively. Then the air flows from the first flow channel 103 to the first installation cavity 105, and the motor is cooled. In addition, since the load force that the motor in this embodiment can bear is above 500N. The larger load force will cause the air bearing 60 at the drive end to have a tendency to move closer to the drive end. At the same time, the components connected to the air bearing 60 away from the drive end will apply tension to the air bearing 60, thereby increasing the internal stress of the air bearing 60 at the drive end, causing the air bearing 60 to be easily damaged. As shown in the attached figure Figure 1 As shown, in this embodiment, the driving member connected to the driving end is the second impeller 30.

[0034] In this embodiment, when the motor is working, the load force on the entire motor is to the right along the axis direction (as shown in the attached Figure 1 In the X1 direction), at this time, the air bearing 60 and the driving member are both subjected to the load force of the whole machine, and the force is all to the right along the axial direction. In order to reduce the load force on the air bearing 60, thereby avoiding damage to the air bearing 60, the present embodiment is provided with a sealing ring 50 on the outer periphery of the thrust plate 40, and a concave-convex structure 51 is provided on the side of the sealing ring 50 close to the thrust plate 40, and a third gap 80 is provided between the outermost side of the concave-convex structure 51 and the outer peripheral side wall of the thrust plate 40. This means that when the airflow flows through the third gap 80 from the second flow channel 104, due to the concave-convex structure 51 on the sealing ring 50, the airflow generates a vortex in the depression of the concave-convex structure 51, and the generation of the vortex causes the pressure of the airflow to decrease, and finally the pressure of the airflow flowing through the third gap 80 is lower than the pressure of the airflow that does not flow through the third gap 80, thereby generating pressure between the high-pressure gas and the low-pressure gas, so that the air bearing 60 away from the driving end is subjected to the load force to the left along the axial direction (such as the attached Figure 1 The pressure in the X2 direction) reduces the effect of the load force of the motor on the air bearing 60, thereby avoiding damage to the air bearing 60 under a large load force to a certain extent.

[0035] Furthermore, the concave-convex structure 51 includes a plurality of protrusions 511 and a plurality of concave portions 512 , and the plurality of protrusions 511 and the plurality of concave portions 512 are alternately arranged in sequence along the axial direction of the rotating shaft 11 .

[0036] Specifically, when the airflow flows into the third gap 80, part of the airflow is diverted into the recessed portion 512, and a vortex is generated in the recessed portion 512, thereby reducing the pressure of the airflow. In this embodiment, the plurality of recessed portions 512 are arranged at intervals along the axial direction, so that the airflow can be diverted in the recessed portions 512 for multiple times, and the kinetic energy of the airflow is consumed, so that the pressure of the airflow is quickly reduced.

[0037] Furthermore, a minimum distance A between the side wall surface of the protrusion 511 close to the thrust plate 40 and the outer peripheral side wall of the thrust plate 40 is smaller than a maximum recessed depth B of the recessed portion 512 .

[0038] Specifically, in this embodiment, the recessed portion 512 is a groove, and the dissipation effect of the vortex on the airflow depends on the ratio of the minimum spacing A between the side wall surface of the protrusion 511 close to the thrust plate 40 and the outer peripheral side wall of the thrust plate 40 to the maximum recessed depth B of the recessed portion 512. Generally speaking, if A is greater than B, the airflow flowing into the groove will flow out of the groove with almost no dissipation, that is, it is difficult to generate a vortex in the groove, resulting in almost no reduction in the pressure of the airflow. When B is greater than A, after the airflow flows into the groove, the airflow collides with the side wall of the groove and changes the direction of movement in the groove, and then generates a vortex in the groove, thereby dissipating the kinetic energy of the airflow to reduce the pressure of the airflow. In addition, in some preferred embodiments, in order to fully dissipate the airflow in the groove, the ratio of A / B can be 1:5, 1:10, 1:15, 1:20 and 1:25.

[0039] Furthermore, along the direction in which the sealing ring 50 moves away from the thrust plate 40 , the width C of the recessed portion 512 along the axial direction of the rotating shaft 11 gradually decreases or remains unchanged.

[0040] As attached Figure 3 As shown, in a preferred embodiment, the width C of the recessed portion 512 along the axial direction of the rotating shaft 11 gradually decreases along the direction in which the sealing ring 50 departs from the thrust plate 40, so that after the airflow is diverted into the groove, it is easier for the airflow to collide with the bottom of the groove, thereby causing the airflow to generate a vortex in the groove. When the width C of the recessed portion 512 along the axial direction of the rotating shaft 11 remains unchanged, when the airflow is diverted into the groove, it collides with the side wall of the groove and changes its direction of movement, which may cause the airflow to directly leave the groove after the collision, so that a vortex cannot be generated in the groove or the generated vortex is small.

[0041] Furthermore, there are n recessed portions 512, and n satisfies the relationship: 4≤n≤35, n∈N +Specifically, if there are too few grooves, that is, n is less than 4, the pressure of the airflow after passing through the third gap 80 may still be relatively high, resulting in too low a pressure generated by the pressure difference, so that the air bearing 60 is still subjected to a relatively large load. When n is greater than 35, on the one hand, the large number of grooves will make the processing of the sealing ring 50 difficult, and on the other hand, the pressure difference between the airflow passing through the third gap 80 and the airflow not passing through the third gap 80 may be too large, resulting in a relatively large pressure, thereby reducing the overall load of the motor, resulting in the motor being unable to meet a relatively large load. The value of n can be 4, 5, 10, 15, 20, 25, 30, and 35.

[0042] Furthermore, the air bearing 60 includes a foil air bearing, which has the characteristics of high temperature resistance, high precision and low cost. On the one hand, it can improve the service life of the motor, and on the other hand, the use of the foil air bearing can reduce the overall manufacturing cost of the motor.

[0043] Furthermore, along the axial direction of the rotating shaft 11 , the thickness D of the sealing ring 50 is less than or equal to the thickness E of the thrust plate 40 .

[0044] Specifically, when the thickness D of the sealing ring 50 is equal to the thickness E of the thrust plate 40, the thickness of the sealing ring 50 is relatively large, and more recessed portions 512 and raised portions 511 can be provided on the sealing ring 50, so that the kinetic energy of the airflow can be better dissipated in the concave-convex structure 51. If the thickness D of the sealing ring 50 is too large, the sealing ring 50 may occupy more installation space, thereby reducing the space utilization rate of the motor. Therefore, the thickness D of the sealing ring 50 may also be smaller than the thickness E of the thrust plate 40. Of course, if the thickness E of the sealing ring 50 is too small, the number of recessed portions 512 and raised portions 511 that can be provided on the sealing ring 50 will be reduced accordingly. The pressure of the airflow can be reduced to a reasonable range by changing the ratio of the minimum spacing A between the side wall surface of the raised portion 511 close to the thrust plate 40 and the outer peripheral side wall of the thrust plate 40 and the maximum recess depth B of the recessed portion 512.

[0045] Furthermore, the base 10 also includes an end cover 101 and a sealing plate 102 , the sealing plate 102 is fixedly connected to the end cover 101 , and a second installation cavity 106 is provided between the sealing plate 102 and the end cover 101 , the sealing ring 50 is arranged in the second installation cavity 106 , and is fixedly connected to the end cover 101 and / or the sealing plate 102 .

[0046] As attached Figure 2As shown, the end cover 101 is arranged on the side away from the driving end, the sealing plate 102 is arranged on the side close to the driving end, the thrust plate 40 and the sealing ring 50 are both installed in the second installation cavity 106, and the sealing ring 50 is fixedly connected to the end cover 101. Of course, the sealing ring 50 can also be fixedly connected to the sealing plate 102, or the sealing ring 50 is fixed to the end cover 101 and the sealing plate 102 at the same time, so as to fix the sealing ring 50 and prevent the width of the third gap 80 between the sealing ring 50 and the thrust plate 40 from changing with the shaking of the sealing ring.

[0047] Furthermore, the air bearing 60 includes a first air bearing 61 and a second air bearing 62 , both of which are disposed in the second mounting cavity 106 , and the first air bearing 61 is fixedly connected to the end cover 101 , and the second air bearing 62 is fixedly connected to the sealing plate 102 .

[0048] Specifically, the first air bearing 61 is arranged on the side away from the driving end, and the second air bearing 62 is arranged on the side close to the driving end. When the motor is started, the first impeller 20 rotates at a high speed, and the gas in the first installation cavity 105 is blown out by the negative pressure generated by the rotation of the first impeller 20, so that the second flow passage 104 is inhaled, and an air film is generated between the first air bearing 61 and the second air bearing 62 and the thrust plate 40. At the same time, since the motor bearing capacity of the present embodiment is usually above 500N, the whole load force of the motor applies pressure to the first air bearing 61 and the second air bearing 62 respectively, and the load force on the second air bearing 62 also applies pressure to the sealing plate 102, that is, the sealing plate 102 has a supporting force on the second air bearing 62, thereby reducing the influence of the load force on the second air bearing 62 to a certain extent. In addition, when the driving member is the second impeller 30, the rotation of the second impeller 30 will generate a force to the left along the axial direction and apply it to the sealing plate 102, thereby reducing the influence of the load force on the second air bearing 62. The first air bearing 61 is subjected to the load force, so that the first air bearing 61 has a tendency to move in the direction away from the end cover 101. At the same time, the end cover 101 will apply a large pulling force to the first air bearing 61, which will cause the internal stress of the first air bearing 61 to be too large, making the first air bearing 61 easy to be damaged. In this embodiment, due to the presence of the sealing ring 50, there is a force in the second installation cavity 106 to the left along the axial direction, and it acts on the first air bearing 61 to reduce the load force on the first air bearing 61, thereby avoiding damage to the first air bearing 61. In addition, when the motor is reversed, that is, the first flow channel 103 inhales air and the second flow channel 104 discharges air, at this time, the load force on the second air bearing 62 can be reduced to a certain extent.

[0049] On the other hand, the present application also provides a fan, which includes the motor in the above embodiment, and thus the fan includes all the technical effects of the motor in the above embodiment. Since the technical effects of the motor have been described in detail above, they will not be repeated here.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0052] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor, characterized in that: include: A machine base (10), the machine base (10) comprising a first installation cavity (105), a first flow passage (103) and a second flow passage (104); A rotating shaft (11), the rotating shaft (11) being rotatably mounted in the first mounting cavity (105), the rotating shaft (11) having a driving end extending out of the machine base (10), the driving end being used to be connected to a driven member; a first impeller (20), the first impeller (20) being connected to an end of the rotating shaft (11) opposite to the driving end; A thrust plate (40), wherein the thrust plate (40) is fixedly sleeved on a side of the rotating shaft (11) close to the driving end; An air bearing (60), wherein the air bearing (60) includes two air bearings (60), the two air bearings (60) are sleeved on the outer periphery of the rotating shaft (11) and are respectively located on both sides of the thrust plate (40), wherein a first gap (71) is provided between the air bearing (60) far from the driving end and the thrust plate (40), and the two ends of the first flow passage (103) are respectively connected to the first gap (71) and the first impeller (20), wherein a second gap (72) is provided between the air bearing (60) close to the driving end and the thrust plate (40), the first end of the second flow passage (104) is connected to the second gap (72), and the second end of the second flow passage (104) extends to the outside of the motor; A sealing ring (50), wherein the sealing ring (50) is sleeved on the outer periphery of the thrust plate (40), and a concave-convex structure (51) is provided on a side of the sealing ring (50) close to the thrust plate (40), and a third gap (80) is provided between the outermost side of the concave-convex structure (51) and the outer peripheral side wall of the thrust plate (40), and the third gap (80) is respectively connected to the first gap (71) and the second gap (72).

2. The motor according to claim 1, characterized in that The concave-convex structure (51) comprises a plurality of raised portions (511) and a plurality of recessed portions (512), and the plurality of raised portions (511) and the plurality of recessed portions (512) are arranged alternately in sequence along the axial direction of the rotating shaft (11).

3. The motor according to claim 2, characterized in that The minimum distance A between the side wall surface of the protrusion (511) close to the thrust plate (40) and the outer peripheral side wall of the thrust plate (40) is smaller than the maximum recessed depth B of the recessed portion (512).

4. The motor according to claim 2, characterized in that Along the direction in which the sealing ring (50) moves away from the thrust plate (40), the width C of the recessed portion (512) along the axial direction of the rotating shaft (11) gradually decreases or remains unchanged.

5. The motor according to claim 2, characterized in that: The number of the recessed portions (512) is n, and n satisfies the relationship: 4≤n≤35, n∈N + .

6. The electric machine according to any one of claims 1 to 5, characterized in that The air bearing (60) comprises a foil air bearing.

7. The electric machine according to any one of claims 1 to 5, characterized in that Along the axial direction of the rotating shaft (11), the thickness D of the sealing ring (50) is less than or equal to the thickness E of the thrust plate (40).

8. The electric machine according to any one of claims 1 to 5, characterized in that The machine base (10) further comprises an end cover (101) and a sealing plate (102), wherein the sealing plate (102) is fixedly connected to the end cover (101), and a second installation cavity (106) is provided between the sealing plate (102) and the end cover (101), and the sealing ring (50) is arranged in the second installation cavity (106) and is fixedly connected to the end cover (101) and / or the sealing plate (102).

9. The motor according to claim 8, characterized in that The air bearing (60) comprises a first air bearing (61) and a second air bearing (62), wherein the first air bearing (61) and the second air bearing (62) are both arranged in the second mounting cavity (106), and the first air bearing (61) is fixedly connected to the end cover (101), and the second air bearing (62) is fixedly connected to the sealing plate (102).

10. A fan, characterized in that: The fan comprises the motor according to any one of claims 1 to 9.

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