Compressor and air conditioning system

Abstract

The present invention relates to a compressor and an air-conditioning system. The compressor includes: a compression part for compressing refrigerant; a rotating shaft (1) for driving the compression part to operate; an air suspension bearing (3) sleeved on the rotating shaft (1); a bearing support (2) provided with an installation hole for installing the air suspension bearing (3); and an elastic cushion layer (4) arranged on the outer circumferential surface of the air suspension bearing (3). By applying the technical solution of the present invention, the elastic cushion layer can provide additional high damping to the air suspension bearing, which is beneficial to preventing problems such as the reduction of the damping of the air suspension bearing and the instability of the air suspension bearing caused by the too high rotational speed of the rotating shaft and the enhanced dynamic pressure effect. The additional high damping provided by the elastic cushion layer can well absorb the vibration of the rotating shaft at high rotational speeds, and improve the operation stability and reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, and more particularly, to a compressor and an air-conditioning system. Background Art

[0002] Figure 1 The structure schematic diagram of a compressor of a related art is shown. As Figure 1 shown, the compressor includes a rotating shaft 1, and a first compression part 2 and a second compression part 3 respectively arranged at both ends of the rotating shaft 1. The exhaust port of the first compression part 2 is communicated with the suction port of the second compression part 3, and the second compression part 3 is used for recompressing the refrigerant compressed by the first compression part 2. The first compression part 2 includes a first centrifugal impeller 2a and a first diffuser 2b for compressing the refrigerant accelerated by the first centrifugal impeller 2a therein. The first centrifugal impeller 2a is connected to the first end of the rotating shaft 1. The second compression part 3 includes a second centrifugal impeller 3a and a second diffuser 3b for compressing the refrigerant accelerated by the second centrifugal impeller 3a therein. The second centrifugal impeller 3a is connected to the second end of the rotating shaft 1. The compressor further includes a bearing 4 for supporting the rotating shaft 1, and the bearing is a hydrostatic gas bearing.

[0003] A hydrostatic gas bearing is a bearing with no friction, low loss and high stability. After the gas passes through the small holes (micro holes, porous holes) on the bearing surface, a stable pressure gas film is formed between the rotating shaft 1 and the inner surface of the bearing 4, so that the rotating shaft 1 floats. Because the gas friction coefficient is small, its energy loss is small and the energy utilization rate is high.

[0004] Currently, the throttling technologies commonly used in hydrostatic gas bearings include single small-hole throttling type, multi-small-hole throttling type, micro-groove throttling type, micro-hole throttling type, and porous material throttling type. Among them, the porous hydrostatic gas bearing uses a new type of porous material as the bearing surface to obtain a lubricating gas film with good consistency. A large number of tiny air supply holes are distributed inside the porous material, and the external gas source enters the bearing surface through the porous material to form a pressure gas film for supporting the load.

[0005] The working principle of the porous gas bearing is relatively complex. When no external driving force is provided to the rotor and only an external gas source is provided, after the bearing supply gas enters the small holes (micro holes, porous holes) of the hydrostatic gas bearing through the air inlet holes, a pressure gas film is finally formed at the gap between the rotor and the bearing to support the external load. In this working condition, the bearing is equivalent to a pure hydrostatic gas bearing; when no external air pressure is provided and only an external driving force is provided to the rotor, due to the hydrodynamic pressure effect, the lubricating gas is brought into the wedge-shaped gap and forms a lubricating gas film to bear the external load. At this time, the bearing is equivalent to a pure hydrodynamic gas bearing; when both an external gas source and an external force for driving the rotor to rotate are provided, if the rotational speed is high, the hydrodynamic pressure effect generated by the rotation of the rotor cannot be ignored.

[0006] The direct stiffness coefficients Kxx and Kyy of the porous hydrostatic gas bearing increase with the increase in rotational speed, while the direct damping coefficients Cxx and Cyy decrease with the increase in rotational speed. Because at higher rotational speeds, the influence of the hydrodynamic effect on the dynamic characteristics of the bearing is much greater than that of the hydrostatic effect. The higher the rotational speed, the stronger the wedge effect and hydrodynamic effect of the gas film, and the greater the load-carrying capacity of the bearing. In this case, it becomes more difficult to change the formed gas film thickness distribution, so the bearing exhibits greater stiffness. In addition, under high-speed operating conditions, the gas in the bearing clearance is compressed and squeezed out of the bearing rotor system, and the kinematic viscosity of the gas film decreases, resulting in a decrease in the damping coefficient of the bearing. The decrease in damping causes the vibration during the operation of the bearing to be unable to be offset, so the operating stability of the bearing will be greatly affected.

[0007] At present, there are several methods to reduce the vibration of the hydrostatic gas bearing, such as adopting the tangential air intake method, pre-eccentric setting, floating ring bearing, and elastic support bearing. However, the first few methods are somewhat difficult to operate for the porous hydrostatic gas bearing. Summary of the Invention

[0008] The present invention aims to provide a compressor and an air-conditioning system to improve the problem that the rotation shaft runs unstably due to the large vibration of the hydrostatic gas bearing in the prior art.

[0009] According to one aspect of the embodiments of the present invention, the present invention provides a compressor, which includes:

[0010] A compression part for compressing the refrigerant;

[0011] A rotating shaft for driving the compression part to work;

[0012] An air suspension bearing sleeved on the rotating shaft;

[0013] A bearing support provided with an installation hole for installing the air suspension bearing; and

[0014] An elastic cushion layer provided on the outer peripheral surface of the air suspension bearing.

[0015] Optionally, the elastic cushion layer extends along the circumferential direction of the air suspension bearing.

[0016] Optionally, a recessed part is provided on the surface of the elastic cushion layer facing the bearing support.

[0017] Optionally, the recessed part extends along the circumferential direction of the air suspension bearing.

[0018] Optionally, the cross-section of the elastic cushion layer parallel to the axial direction of the air suspension bearing is wavy.

[0019] Optionally, the compressor further includes a positioning part for restricting the axial movement of the elastic cushion layer relative to the air suspension bearing along the axial direction of the air suspension bearing.

[0020] Optionally, the positioning portion includes a positioning groove and a protruding portion adapted to the positioning groove. One of the positioning groove and the protruding portion is provided on the air suspension bearing, and the other is provided on the elastic cushion layer.

[0021] Optionally, the bearing support is provided with a passage for delivering gas to the air suspension bearing.

[0022] Optionally, the compression portion includes an impeller mounted on the rotating shaft and a diffuser provided at an end of the impeller away from the rotating shaft.

[0023] According to another aspect of the present application, an air conditioning system is further provided, and the air conditioning system includes the compressor described above.

[0024] Applying the technical solution of the present invention, the elastic cushion layer can provide additional high damping to the air suspension bearing, which is beneficial to preventing the problems of damping reduction of the air suspension bearing and instability of the air suspension bearing caused by too high rotational speed of the rotating shaft and enhanced dynamic pressure effect. The additional high damping provided by the elastic cushion layer can well absorb the vibration of the rotating shaft at high rotational speed and improve the operation stability and reliability of the compressor.

[0025] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Shows a schematic structural diagram of a compressor in the related art;

[0028] Figure 2 Shows a schematic structural diagram of the compressor in the embodiment of the present invention;

[0029] Figure 3 Shows a schematic structural diagram of the air suspension bearing and the elastic cushion layer of the compressor in the embodiment of the present invention;

[0030] Figure 4 Shows a schematic structural diagram of the air suspension bearing of the compressor in the embodiment of the present invention;

[0031] Figure 5 Shows a schematic structural diagram of the elastic cushion layer of the compressor in the embodiment of the present invention;

[0032] Figure 6 The structural schematic diagram of the air suspension bearing and the elastic cushion layer of the compressor showing another alternative embodiment of the present invention; and

[0033] Figure 7 The structural schematic diagram of the elastic cushion layer of the compressor showing another alternative embodiment of the present invention.

[0034] In the figure:

[0035] 1. Rotating shaft; 2. Bearing support; 3. Air suspension bearing; 31. Positioning groove; 4. Elastic cushion layer; 41. Depressed part; 42. Protruding part; 43. Wavy structure; 5. Duct. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Figure 2 The structural schematic diagram of the compressor showing the embodiment of the present invention is combined with Figure 2 As shown, the compressor in this embodiment includes a compression part for compressing refrigerant, a rotating shaft 1 for driving the compression part to work, an air suspension bearing 3 sleeved on the rotating shaft 1, a bearing support 2 provided with a mounting hole for mounting the air suspension bearing 3, and an elastic cushion layer 4 provided on the outer peripheral surface of the air suspension bearing 3. The material of the elastic cushion layer 4 can be rubber.

[0038] In this embodiment, the elastic cushion layer 4 can provide additional high damping to the air suspension bearing 3, which is beneficial to preventing the problems of the reduction of the damping of the air suspension bearing 3 and the instability of the air suspension bearing 3 caused by the too high rotation speed of the rotating shaft 1 and the enhanced dynamic pressure effect. The additional high damping provided by the elastic cushion layer 4 can well absorb the vibration of the rotating shaft 1 at high speeds and improve the operation stability and reliability of the compressor.

[0039] Furthermore, the elastic cushion layer 4 can also improve the overall sealing performance of the compressor, preventing the refrigerant or the gas provided for the air suspension bearing 3 from leaking out and the pressure difference not meeting the requirements for bearing conduction.

[0040] The compression part includes an impeller mounted on the rotating shaft 1 and a diffuser provided at one end of the impeller away from the rotating shaft 1. The impeller is used to accelerate the refrigerant inhaled by the compression part, and the refrigerant is compressed in the diffuser after being accelerated by the impeller.

[0041] The elastic cushion layer 4 extends circumferentially along the air suspension bearing 3. The elastic cushion layer 4 is sleeved on the entire outer circumferential surface of the air suspension bearing 3 to provide higher damping to the air suspension bearing 3 and reduce the vibration generated when the rotating shaft 1 rotates at high speed, thereby improving the stability and reliability of the compressor operation.

[0042] Figure 3 Fig. shows the structural schematic diagram of the air suspension bearing 3 and the elastic cushion layer 4 of this embodiment; Figure 4 Fig. shows the structural schematic diagram of the air suspension bearing 3 of this embodiment; Figure 5 Fig. shows the structural schematic diagram of the elastic cushion layer 4 of this embodiment.

[0043] Combined with Figures 2 to 5 As shown, a recessed portion 41 is provided on the surface of the elastic cushion layer 4 facing the bearing support 2 to reduce the area of the mating surface between the elastic cushion layer 4 and the bearing support 2, thereby reducing the friction during the process of installing the air suspension bearing 3 and the elastic cushion layer 4 into the mounting hole of the bearing support 2, which is beneficial to reducing the difficulty of assembling the air suspension bearing 3 and the elastic cushion layer 4.

[0044] In this embodiment, the recessed portion 41 is an annular shape extending circumferentially along the air suspension bearing 3.

[0045] As Figures 3 to 5 shown, the compressor further includes a positioning portion for restricting the axial movement of the elastic cushion layer 4 relative to the air suspension bearing 3 along the axis of the air suspension bearing 3.

[0046] The positioning portion includes a positioning groove 31 provided on the outer circumferential surface of the air suspension bearing 3 and a protruding portion 42 provided on the inner circumferential surface of the elastic cushion layer 4. The protruding portion 42 is adapted to the positioning groove 31. After the elastic cushion layer 4 is sleeved on the outer circumferential surface of the air suspension bearing 3, the protruding portion 42 is embedded in the positioning groove 31, thereby restricting the relative axial movement between the air suspension bearing 3 and the elastic cushion layer 4.

[0047] Optionally, the positioning groove 31 extends circumferentially along the air suspension bearing 3, and the protruding portion 42 extends circumferentially along the elastic cushion layer 4.

[0048] In some other alternative embodiments, a positioning groove is provided on the inner surface of the elastic cushion layer 4, and a protruding portion adapted to the positioning groove is provided on the outer circumferential surface of the air suspension bearing 3.

[0049] In this embodiment, the air suspension bearing 3 is a hydrostatic air suspension bearing. The bearing support 2 is provided with a duct 5 for delivering gas to the air suspension bearing 3.

[0050] The air suspension bearing 3 includes a porous material for permeating the gas in the duct 5 into the gap between the air suspension bearing 3 and the rotating shaft 1 to form an air film between the air suspension bearing 3 and the rotating shaft 2.

[0051] Combined with Figures 2 to 5 As shown, the compressor of this embodiment includes a porous hydrostatic gas bearing 3 and an elastic cushion layer 4 attached to the outer peripheral surface of the gas bearing 3.

[0052] Among them, the elastic cushion layer 4 made of rubber is installed in the positioning groove 31 of the porous hydrostatic gas bearing 3 through the protrusion 42. This structure can position the elastic cushion layer 4 on the gas bearing 3 relatively simply.

[0053] The outer peripheral surface of the elastic cushion layer 4 is also provided with a recess 41 to reduce the mating surface between the elastic cushion layer 4 and the bearing support 2, reduce the friction during the process of installing the gas bearing 3 and the elastic cushion layer 4 into the installation hole, and thus reduce the assembly difficulty. The elastic cushion layer 4 is a whole rubber block, so it has a large damping and can provide an additional large damping to the gas bearing 3. When the bearing damping decreases at high speeds, it can well provide damping to the bearing and absorb the energy of the vibration of the rotating shaft 1, thereby improving the operation stability of the compressor.

[0054] Figure 6 The structural schematic diagram of the gas bearing 3 and the elastic cushion layer 4 of the compressor of another alternative embodiment is shown; Figure 7 The structural schematic diagram of the elastic cushion layer 4 of this embodiment is shown.

[0055] Combined with Figure 6 and Figure 7 As shown, the cross-section of the elastic cushion layer 4 parallel to the axial direction of the gas bearing 3 is wavy. The inner peripheral surface of the elastic cushion layer 4 is provided with a protrusion 42, and the outer peripheral surface of the gas bearing 3 is provided with a positioning groove adapted to the protrusion 42. The protrusion 42 is embedded in the positioning groove to limit the axial movement of the elastic cushion layer 4 relative to the gas bearing 3 along the axial direction of the gas bearing 3.

[0056] The wavy structure 43 can serve as the first-stage buffer. When the damping of the gas bearing 3 decreases, the wavy structure 43 is first compressed, and the wavy structure 43 provides a certain damping to the gas bearing 3. When the damping of the wavy structure 43 cannot eliminate the vibration of the rotating shaft 1, the main body part of the elastic cushion layer 4 can still provide a certain damping to the bearing, thereby offsetting the vibration of the bearing. This bearing structure provides a two-stage shock absorption effect, can significantly eliminate the vibration of the rotating shaft 1, and improve the operation stability of the compressor.

[0057] As Figure 2As shown in the figure, air suspension bearings 3 are provided at both ends of the rotating shaft 1 of the compressor in this embodiment. Bearing supports 2 are also provided at both ends of the rotating shaft 1, and the two air suspension bearings 3 are respectively installed in the bearing installation holes of the two bearing supports 2. The inner diameter of the bearing installation hole is smaller than the outer diameter of the elastic cushion layer 4. A hole passage 5 for delivering gas to the air suspension bearing 3 is provided on the bearing support 2.

[0058] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A compressor, characterized in that, Comprising: A compression part for compressing a refrigerant; A rotating shaft (1) for driving the compression part to operate; An air suspension bearing (3) sleeved on the rotating shaft (1); A bearing support (2) provided with a mounting hole for mounting the air suspension bearing (3); and An elastic cushion layer (4) disposed on the outer circumferential surface of the air suspension bearing (3), The compressor further includes a positioning part for restricting axial movement of the elastic cushion layer (4) relative to the air suspension bearing (3) along the axis of the air suspension bearing (3), The positioning part includes a positioning groove (31) and a protruding part (42) adapted to the positioning groove (31), one of the positioning groove (31) and the protruding part (42) is provided on the air suspension bearing (3), and the other is provided on the elastic cushion layer (4), The air suspension bearing (3) is a hydrostatic air suspension bearing, and the bearing support (2) is provided with a passage (5) for delivering gas to the air suspension bearing (3).

2. The compressor according to claim 1, characterized in that, The elastic cushion layer (4) extends circumferentially along the air suspension bearing (3).

3. The compressor according to claim 1, characterized in that, A recessed part (41) is provided on the surface of the elastic cushion layer (4) facing the bearing support (2).

4. The compressor according to claim 3, characterized in that, The recessed part (41) extends circumferentially along the air suspension bearing (3).

5. The compressor according to claim 1, wherein, The cross-section of the elastic cushion layer (4) parallel to the axis of the air suspension bearing (3) is wavy.

6. The compressor according to claim 1, characterized in that, The compression part includes an impeller mounted on the rotating shaft (1) and a diffuser provided at an end of the impeller remote from the rotating shaft (1).

7. An air conditioning system, characterized in that, A compressor according to any one of claims 1 to 6.

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