Gas dynamic pressure axial thrust structure, motor and air compressor

Abstract

The application relates to the technical field of air bearing, in particular to a gas dynamic pressure axial thrust structure, a motor and an air compressor, which comprises a rotating shaft, a thrust disc, a first thrust bearing and a second thrust bearing, the thrust disc, the first thrust bearing and the second thrust bearing are sleeved on the rotating shaft, the thrust disc has a first side and a second side which are opposite to each other, the first thrust bearing is located on the first side of the thrust disc, and the second thrust bearing is located on the second side of the thrust disc; the gas dynamic pressure axial thrust structure further comprises a gas guiding structure which is used for guiding the gas on the second side to the first side when the thrust disc rotates, so as to form a high-pressure area on the first side and a low-pressure area on the second side. The high-pressure area and the low-pressure area are formed on the two sides of the thrust disc respectively, the axial carrying capacity of the bearing is increased, and the problem that the bearing is damaged due to the insufficient carrying capacity of the bearing when the rotating shaft moves is avoided.

Description

Technical Field

[0001] This invention relates to the field of air bearing technology, and in particular to a gas dynamic pressure axial thrust structure, a motor, and an air compressor. Background Technology

[0002] An air compressor is a device used to compress gas. If the axial force of the air compressor suddenly changes direction, it may experience axial movement, causing the impeller to collide with the volute and malfunction, damaging the shaft and bearings.

[0003] A Chinese utility model patent with publication number CN216691851U, entitled "An Axially Supported Dynamic Pressure Air Thrust Bearing," includes a bearing housing. The upper surface of the bearing housing has several "bubble-like" venting grooves that increase the air film pressure between the bearing and the rotor thrust plate. Each "bubble-like" venting groove includes an inlet area and a pressurization area, with a throttling orifice between them. An elastic support assembly for supporting the rotor thrust plate is fixedly connected to the upper surface of the bearing housing. The "bubble-like" venting grooves are located below the elastic support assembly. By employing the "bubble-like" venting grooves, when the rotor speed increases, airflow flows through the grooves into the space between the bearing and the rotor thrust plate. Due to the throttling effect of the "bubble-like" venting grooves, the air film pressure between the bearing and the rotor thrust plate increases, thereby improving the bearing's load-bearing capacity. When the shaft moves erratically, it can only improve the bearing capacity on one side of the rotor thrust plate. The gas film pressure is limited and cannot fully utilize the gas on both sides of the rotor thrust plate. When the gas film pressure is sufficient, the excess gas is not utilized, resulting in waste. Summary of the Invention

[0004] In view of this, the present invention provides a gas dynamic pressure axial thrust structure, a motor and an air compressor. The main technical problem it solves is that by using a gas guiding structure, the gas on one side of the thrust disc can be reused on the other side of the thrust disc, thereby improving the bearing load-bearing effect and effectively preventing axial movement on one side of the rotating shaft.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0006] In a first aspect, embodiments of the present invention provide a gas dynamic pressure axial thrust structure, including a rotating shaft, a thrust plate, a first thrust bearing and a second thrust bearing. The thrust plate, the first thrust bearing and the second thrust bearing are all sleeved on the rotating shaft. The thrust plate has a first side and a second side opposite to each other. The first thrust bearing is located on the first side of the thrust plate and the second thrust bearing is located on the second side of the thrust plate.

[0007] The gas dynamic axial thrust structure also includes a gas guiding structure, which is used to guide the gas on the second side to the first side when the thrust disc rotates, so as to form a high-pressure zone on the first side and a low-pressure zone on the second side.

[0008] In some embodiments, the gas guiding structure includes a gas guide groove a disposed on the circumferential outer wall of the thrust plate, the gas guide groove a being used to push the gas on the second side toward the first side when the thrust plate rotates.

[0009] In some embodiments, the air guide groove a extends from the low-pressure side to the high-pressure side along the rotation direction of the thrust plate.

[0010] In some embodiments, the thrust plate is a truncated cone structure, the diameter of which gradually increases from the low-pressure area to the high-pressure area along the axial direction of the rotating shaft, and the air guide groove a is provided on the conical surface of the truncated cone structure.

[0011] In some embodiments, the gas dynamic pressure axial thrust structure further includes a gas guide groove b disposed on the inner wall of the thrust disc shaft hole. The gas guide groove b is used to guide the gas on the first side to the second side when the thrust disc rotates, so that the gas flows back.

[0012] In some embodiments, the air guide groove b extends from the first side to the second side along the direction of rotation of the thrust plate.

[0013] In some embodiments, there are two or more air guide slots a and two or more air guide slots b, and the total exhaust volume of each air guide slot a is greater than the total exhaust volume of each air guide slot b.

[0014] In some implementations, the number of air guide grooves a and b is the same, and the diameter of the slot of air guide groove a is larger than the diameter of the slot of air guide groove b.

[0015] Secondly, embodiments of the present invention also provide an electric motor, including the gas dynamic axial thrust structure described above.

[0016] Thirdly, embodiments of the present invention also provide an air compressor, including the motor described above.

[0017] By employing the above technical solutions, the pneumatic axial thrust structure, motor, and air compressor of the present invention have at least the following beneficial effects:

[0018] 1. The gas dynamic pressure axial thrust structure of the present invention increases the axial bearing capacity of the bearing by opening a gas guiding structure on the thrust plate and forming high and low pressure zones on both sides of the thrust plate, thereby avoiding bearing damage due to insufficient bearing capacity when the shaft moves.

[0019] 2. The gas dynamic pressure axial thrust structure of the present invention, by setting an outer arc-shaped air guide groove and an inner arc-shaped air guide groove on the thrust plate, allows excess gas on one side of the thrust plate to enter the other side for reuse, thereby improving the gas utilization rate, rationally redistributing the bearing load on both sides of the thrust plate, and effectively preventing axial movement of the rotating shaft on one side.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the gas dynamic pressure axial thrust structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the thrust plate in the gas dynamic pressure axial thrust structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the motor of the present invention;

[0025] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0026] Reference numerals: 01, housing; 02, stator; 03, diffuser a; 04, end cover a; 05, diffuser b; 06, end cover b; 07, gas dynamic pressure axial thrust structure; 071, shaft; 072, first thrust bearing; 073, thrust plate; 0731, air guide groove a; 0732, air guide groove b; 074, second thrust bearing. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, the present invention proposes a gas dynamic pressure axial thrust structure, including a rotating shaft 071, a thrust plate 073, a first thrust bearing 072 and a second thrust bearing 074. The thrust plate 073, the first thrust bearing 072 and the second thrust bearing 074 are all sleeved on the rotating shaft 071. The thrust plate 073 has a first side and a second side facing away from each other. The first thrust bearing 072 is located on the first side of the thrust plate 073, and the second thrust bearing 074 is located on the second side of the thrust plate 073.

[0032] The gas dynamic pressure axial thrust structure also includes a gas guiding structure, which is used to guide the gas on the second side to the first side when the thrust plate 073 rotates, so as to form a high pressure zone on the first side and a low pressure zone on the second side.

[0033] The shaft 071 moves to the left, thus creating a high-pressure zone on the left side of the thrust plate 073, i.e., the first side. The thrust plate 073, the first thrust bearing 072, and the second thrust bearing 074 can be considered as a sealed chamber. The total amount of gas in the sealed chamber remains dynamically constant. When the direction of the shaft 071's movement is determined to be to the left, the gas guiding structure allows the gas on the right side of the thrust plate 073 to enter the left side of the thrust plate 073, i.e., the gas on the second side enters the first side. On the first side of the thrust plate 073, i.e., the first thrust bearing 072 and... A high-pressure zone is formed between the thrust discs 073. This high-pressure zone increases the axial load capacity of the first thrust bearing 072, preventing the first thrust bearing 072 from being damaged due to insufficient load capacity when the shaft 071 moves to the left. When the shaft 071 moves rapidly toward the first side, its speed gradually drops to zero under the high load capacity of the first thrust bearing 072. It may even move back toward the second side under the pressure difference at both ends after moving a certain distance, and the pressure difference gradually disappears, thus maintaining dynamic balance.

[0034] In some embodiments, the gas guiding structure includes a gas guide groove a0731 disposed on the circumferential outer wall of the thrust plate 073, the gas guide groove a0731 being used to push the gas on the second side to the first side when the thrust plate 073 rotates.

[0035] When the rotating shaft 071 drives the thrust plate 073 to rotate, the gas on the second side of the thrust plate 073 is guided to the first side through the air guide groove a0731. That is, the gas between the thrust plate 073 and the second thrust bearing 074 is guided between the thrust plate 073 and the first thrust bearing 072, thereby forming a high-pressure zone on the first side of the thrust plate 073, that is, between the gas-guided thrust plate 073 and the first thrust bearing 072, thereby improving the axial load-bearing capacity of the first thrust bearing 072.

[0036] In some embodiments, the air guide groove a0731 extends from the low-pressure area side to the high-pressure area side along the rotation direction of the thrust plate 073.

[0037] When the thrust plate 073 rotates, the gas on the second side is guided to the first side through the inner wall of the gas guide groove a0731. The rotation of the thrust plate 073 generates centrifugal force, which pushes the gas entering the gas guide groove a0731 toward the first side. As the thrust plate 073 rotates, the gas is pushed to the outside of the thrust plate 073, that is, the first side of the thrust plate 073. The structure of the gas guide groove a0731 facilitates the entry of gas on the second side, further increases the gas flow rate, and is conducive to the rapid formation of the high-pressure zone on the first side.

[0038] In some embodiments, the thrust plate 073 is a truncated cone structure, the diameter of which gradually increases from the low-pressure region to the high-pressure region along the axial direction of the rotating shaft 071. The gas guide groove a0731 is provided on the conical surface of the truncated cone structure. This increases the intake space and gas flow rate, further increasing the rate at which the gas on the second side enters the gas guide groove a0731, which is beneficial for the rapid formation of the high-pressure region.

[0039] In some embodiments, the gas dynamic pressure axial thrust structure further includes a gas guide groove b0732 disposed on the inner wall of the thrust plate 073 shaft hole. The gas guide groove b0732 is used to guide the gas on the first side to the second side when the thrust plate rotates, so that the gas flows back.

[0040] The gas guide groove b0732 directs the gas from the high-pressure zone on the first side to the low-pressure zone on the second side, that is, the gas on the left side of the thrust plate 073 flows to the right side, forming a circulation loop. This prevents the second thrust bearing 074 from malfunctioning due to excessive gas loss, which could cause a rapid drop in bearing force.

[0041] In some embodiments, the air guide groove b0732 extends from the first side to the second side along the rotation direction of the thrust plate 073. The structure of the air guide groove b0732 facilitates the entry of gas from the first side and increases the efficiency of the return flow.

[0042] In some embodiments, there are two or more air guide grooves a0731 and two or more air guide grooves b0732. The total exhaust volume of each air guide groove a0731 is greater than the total exhaust volume of each air guide groove b0732. That is, the gas intake volume on the first side is greater than the gas intake volume on the second side, and the first side is sufficient to form a high-pressure zone.

[0043] In some embodiments, the number of air guide grooves a0731 and b0732 is the same, and the diameter of the slot hole of air guide groove a0731 is larger than the diameter of the slot hole of air guide groove b0732. The air intake volume of air guide groove a0731 per unit time is greater than the air output volume of air guide groove b0732 per unit time, which is beneficial to the formation of a high-pressure zone, i.e. Figure 1 As shown in the figure, φA>φB.

[0044] The aforementioned gas dynamic pressure axial thrust structure, through the structure of opening air guide grooves on the outer peripheral wall of the thrust plate 073 and the inner wall of the shaft hole, allows excess gas on one side of the thrust plate 073 to enter the other side for reuse, forming a high-pressure zone in the direction of axial movement of the shaft 071, improving the utilization rate of gas, rationally redistributing the bearing load on both sides, and effectively preventing the bearing of the shaft 071 from being damaged due to axial movement.

[0045] Example 2

[0046] The present invention also provides an electric motor, including the above-described pneumatic axial thrust structure 07.

[0047] like Figure 3 As shown, the present invention proposes an electric motor including a housing 01, with a plurality of stators 02 connected to the inner wall of the housing 01. End caps a04 and b06 are respectively provided at both ends of the housing 01. A diffuser a04 is connected to the side of the end cap a04 away from the housing 01, and a diffuser b05 is connected to the side of the end cap b06 away from the housing 01. A rotating shaft 071 passes through the end cap a04, the diffuser a04, the housing 01, the stators 02, the diffuser b05, and the end cap b06. When the rotating shaft 071 moves to the left, a gas dynamic pressure axial thrust structure 07 is provided between the end cap a04 and the diffuser a04 to increase the bearing capacity and prevent the bearing from being damaged due to the movement of the rotating shaft 071.

[0048] like Figure 4 As shown, the gas is in a dynamic equilibrium process. Gas can be introduced into the sealed chamber from the diffuser a03 and then discharged from the gap between the end cover a04 and the rotating shaft 071, forming a dynamic equilibrium.

[0049] In both Embodiment 1 and Embodiment 2 of this invention, the situation of the rotating shaft 071 moving to the left is addressed. When the rotating shaft 071 is running at high speed and changing speed, the axial force may change from one side to the other side. The specific direction needs to be determined according to the specific structure of the impeller and the rotational speed at that time. This invention can be used after the direction of the rotation of the rotating shaft 071 is determined.

[0050] Example 3

[0051] The present invention also provides an air compressor, including the motor described in Embodiment 2.

[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A gas dynamic axial thrust structure, characterized in that, It includes a rotating shaft (071), a thrust plate (073), a first thrust bearing (072), and a second thrust bearing (074). The thrust plate (073), the first thrust bearing (072), and the second thrust bearing (074) are all sleeved on the rotating shaft (071). The thrust plate (073) has a first side and a second side facing away from each other. The first thrust bearing (072) is located on the first side of the thrust plate (073), and the second thrust bearing (074) is located on the second side of the thrust plate (073). The gas dynamic pressure axial thrust structure also includes a gas guiding structure, which is used to guide the gas on the second side to the first side when the thrust plate (073) rotates, so as to form a high pressure zone on the first side and a low pressure zone on the second side.

2. The gas dynamic axial thrust structure according to claim 1, characterized in that, The gas guiding structure includes a gas guide groove a (0731) disposed on the circumferential outer wall of the thrust plate (073), the gas guide groove a (0731) being used to push the gas on the second side to flow to the first side when the thrust plate (073) rotates.

3. The gas dynamic axial thrust structure according to claim 2, characterized in that, The air guide groove a (0731) extends from the low-pressure area side to the high-pressure area side along the rotation direction of the thrust plate (073).

4. A gas dynamic axial thrust structure according to claim 2 or 3, characterized in that, The thrust plate (073) is a truncated cone structure. The diameter of the truncated cone structure gradually increases from the low pressure area to the high pressure area along the axial direction of the rotating shaft (071). The air guide groove a (0731) is provided on the conical surface of the truncated cone structure.

5. The gas dynamic axial thrust structure according to claim 2, characterized in that, The gas dynamic pressure axial thrust structure also includes a gas guide groove b (0732) provided on the inner wall of the shaft hole of the thrust plate (073). The gas guide groove b (0732) is used to guide the gas on the first side to the second side when the thrust plate rotates, so that the gas flows back.

6. The gas dynamic axial thrust structure according to claim 5, characterized in that, The air guide groove b (0732) extends from the first side to the second side along the rotation direction of the thrust plate (073).

7. The gas dynamic axial thrust structure according to claim 6, characterized in that, There are two or more air guide slots a (0731) and two or more air guide slots b (0732), and the total exhaust volume of each air guide slot a (0731) is greater than the total exhaust volume of each air guide slot b (0732).

8. The gas dynamic axial thrust structure according to claim 7, characterized in that, The number of air guide grooves a (0731) and air guide grooves b (0732) is the same, and the diameter of the slot of air guide groove a (0731) is larger than the diameter of the slot of air guide groove b (0732).

9. An electric motor, characterized in that, Including the gas dynamic axial thrust structure as described in any one of claims 1-8.

10. An air compressor, characterized in that, Including the motor described in claim 9.

Images