Bearing support, air suspension compressor and air conditioner having the same

Abstract

The present invention relates to a bearing support, an air suspension compressor and an air conditioner having the same, wherein the bearing support comprises: a first end; and a second end, wherein the second end and the first end are two opposite ends along the axial direction of the bearing support; along the direction from the first end to the second end, the radial dimension of at least part of the bearing support gradually increases. The present invention can meet the radial strength requirements, and the radial dimension gradually increases, thereby improving the structural strength of the bearing support.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to a bearing support, an air suspension compressor and an air conditioner having the same. Background Art

[0002] Hydrodynamic gas bearings have the advantages of high precision, low friction loss, long life, low vibration, no pollution, and no need to provide lubricating medium. They are also suitable for high-speed and high-precision occasions and have broad application prospects in centrifugal compressors, especially miniaturized centrifugal compressors.

[0003] However, hydrodynamic bearings also have their own disadvantages. For example, due to the low viscosity of the gas and the lack of external gas supply, the load capacity is low, the bearing clearance is micrometers or tens of micrometers, and the processing and assembly precision is extremely high. These disadvantages of hydrodynamic bearings place high demands on the design of their bearing supports, and it is difficult to ensure the strength requirements of the related bearing support structures. Summary of the invention

[0004] One of the purposes of the present invention is to provide a bearing support, an air suspension compressor and an air conditioner having the same, so as to alleviate the problem that the bearing support in the related art is difficult to ensure strength.

[0005] Some embodiments provide a bearing support, comprising: a first end; and a second end, wherein the second end and the first end are two opposite ends along the axial direction of the bearing support; along the direction from the first end to the second end, the radial dimension of at least a portion of the bearing support gradually increases.

[0006] In some embodiments, a radial dimension of the first end is smaller than a radial dimension of the second end.

[0007] In some embodiments, the bearing support further includes: a bearing hole for mounting a bearing; and an annular groove arranged around the bearing hole.

[0008] In some embodiments, the second end portion includes: a limiting portion, which is used to abut against the inner side of the part to be installed; and a connecting portion, which extends radially outward of the bearing support relative to the limiting portion and is used to connect with the part to be installed; a stop is formed between the limiting portion and the connecting portion, which is used to cooperate with the part to be installed for positioning.

[0009] In some embodiments, the connecting portion is annular and is arranged along the circumference of the limiting portion.

[0010] In some embodiments, it also includes: a bearing hole for installing a bearing; and a vent hole, which is arranged radially along the bearing support, wherein the first end of the vent hole is connected to the bearing hole, and the second end of the vent hole is connected to the radial outside of the bearing support.

[0011] Some embodiments provide a compressor, comprising: a shell; and the above-mentioned bearing support, wherein the bearing support is arranged in the shell, the first end of the bearing support is adjacent to the end of the shell, and the second end of the bearing support is connected to the inner wall of the shell.

[0012] In some embodiments, the inner wall of the shell is provided with a mounting portion extending toward the center of the shell for connecting with the second end of the bearing support.

[0013] In some embodiments, the second end of the bearing support includes: a limiting portion, which abuts against the inner side of the mounting portion; and a connecting portion, which extends radially outward from the limiting portion to the bearing support and is used to connect with the mounting portion; a stop is formed between the limiting portion and the connecting portion for cooperating with the mounting portion for positioning.

[0014] In some embodiments, it includes: a radial bearing, arranged in the bearing hole; and a thrust bearing, arranged at the first end of the bearing support; the bearing support includes: a vent hole, arranged along the radial direction of the bearing support, and the vent hole is used to connect the space where the radial bearing is located with the space where the thrust bearing is located.

[0015] In some embodiments, it includes: a radial bearing, arranged in the bearing hole of the bearing support; a thrust bearing, arranged at the first end of the bearing support; and a thrust bearing fixing plate, arranged between the thrust bearing and the bearing support, and fixedly connected to the first end of the bearing support and the thrust bearing.

[0016] In some embodiments, it includes: a diffuser, which is arranged at the end of the shell; and a thrust plate, which has thrust bearings on both opposite sides, wherein the thrust bearing on one side is fixedly connected to the thrust bearing fixing plate, and the thrust bearing on the other side is fixedly connected to the diffuser.

[0017] In some embodiments, at least one of the radial bearing and the thrust bearing is a gas bearing.

[0018] In some embodiments, the compressor comprises a centrifugal compressor.

[0019] Some embodiments provide an air conditioner, which includes the above-mentioned compressor.

[0020] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0021] In some embodiments, the radial dimension of at least part of the bearing support gradually increases to meet the radial strength requirement, and the gradually increasing radial dimension is also used to improve the structural strength of the bearing support.

[0022] In some embodiments, the radial dimension of at least a portion of the bearing support gradually increases, which can effectively transmit the axial force to the housing of the compressor motor, thereby improving the strength and service life of the bearing support. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of a compressor provided for some embodiments of the present invention;

[0025] Figure 2 A schematic diagram of the assembly of a bearing and a bearing support provided in some embodiments of the present invention;

[0026] Figure 3 A schematic diagram of the structure of a bearing support provided in some embodiments of the present invention;

[0027] Figure 4 A schematic cross-sectional view of a bearing support provided in some embodiments of the present invention.

[0028] Numbers in the attached drawings:

[0029] 1- housing;

[0030] 2-bearing support; 21-bearing hole; 22-annular groove; 23-limiting part; 24-connecting part; 25-ventilation hole;

[0031] 3- radial bearing;

[0032] 4-Thrust bearing;

[0033] 5-Thrust bearing fixing plate;

[0034] 6-Thrust plate;

[0035] 7-diffuser;

[0036] 8- rotor;

[0037] 9- Stator. DETAILED DESCRIPTION

[0038] The technical scheme in the embodiment will be described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0040] like Figure 3 , Figure 4 Schematic diagram of a bearing support provided in some embodiments is shown.

[0041] In some embodiments, the bearing support 2 includes a first end and a second end.

[0042] In some embodiments, the second end of the bearing support 2 and the first end are opposite ends along the axial direction of the bearing support 2. In the direction from the first end to the second end of the bearing support 2, the radial dimension of at least part of the bearing support 2 gradually increases.

[0043] The axial direction of the bearing support 2 is consistent with the axial direction of the shaft supported by the bearing. The radial direction of the bearing support 2 is consistent with the radial direction of the shaft supported by the bearing.

[0044] In some embodiments, the shaft supported by the bearing is the rotor 8 of a compressor.

[0045] In some embodiments, the radial dimension of the first end of the bearing support 2 is smaller than the radial dimension of the second end.

[0046] In some embodiments, the bearing support 2 further includes a bearing hole 21, and the bearing hole 21 is used to install a bearing.

[0047] In some embodiments, the bearing support 2 further includes an annular groove 22 , and the annular groove 22 is arranged around the bearing hole 21 .

[0048] In some embodiments, the second end of the bearing support 2 includes a limiting portion 23, and the limiting portion 23 is used to abut against the inner side of the part to be installed.

[0049] In some embodiments, the second end of the bearing support 2 includes a connecting portion 24, which extends radially outward of the bearing support 2 relative to the limiting portion 23 and is used to connect with a component to be installed.

[0050] In some embodiments, a stopper is formed between the limiting portion 23 and the connecting portion 24 for cooperating with and positioning the component to be installed.

[0051] In some embodiments, the component to be mounted is a housing 1 of a compressor.

[0052] In some embodiments, the connecting portion 24 is annular and is disposed along the circumference of the limiting portion 23 .

[0053] In some embodiments, the bearing support 2 further includes a bearing hole 21, which is arranged along the axial direction of the bearing support 2 and is used to install a bearing.

[0054] In some embodiments, the bearing support 2 further includes a vent hole 25 , which is arranged radially along the bearing support 2 , wherein a first end of the vent hole 25 is connected to the bearing hole 21 , and a second end of the vent hole 25 is connected to the radial outside of the bearing support 2 .

[0055] like Figure 1 , which is a schematic diagram of a compressor provided in some embodiments.

[0056] In some embodiments, the compressor comprises a housing 1. End covers may be provided at both ends of the housing 1 along the central axis.

[0057] In some embodiments, the compressor includes a rotor 8 and a stator 9 disposed in a housing 1. The rotor 8 is disposed along the central axis of the housing 1. The stator 9 is disposed between the inner wall of the housing 1 and the rotor 8, and is fixedly connected to the inner wall of the housing 1.

[0058] In some embodiments, radial bearings 3 and bearing supports 2 are provided at both ends of the rotor 8 .

[0059] In some embodiments, the compressor comprises a bearing support 2, and the bearing support 2 is disposed in the housing 1. Further, the bearing support 2 is suitable for a gas bearing, such as a hydrodynamic gas bearing.

[0060] In some embodiments, the first end of the bearing support 2 is adjacent to the end cover of the housing 1 , and the second end of the bearing support 2 is connected to the inner wall of the housing 1 .

[0061] In some embodiments, the first end and the second end of the bearing support 2 are two opposite ends along the axial direction of the bearing support 2, and the first end of the bearing support 2 is closer to the end of the housing 1 relative to the second end of the bearing support 2. The end of the housing 1 is the end of the housing 1 close to the bearing support 2.

[0062] In some embodiments, along the direction from the first end to the second end of the bearing support 2, the radial dimension of at least a portion of the bearing support 2 gradually increases.

[0063] The inventors found that the radial force on the bearing support 2 is basically equal to the gravity of the rotor, and the radial load is relatively small, so the radial strength requirement of the bearing support 2 is not high. However, when the bearing support 2 bears radial load and axial load at the same time, the bearing support 2 also needs to have a certain structural strength to withstand the radial load and axial load. Therefore, the radial dimension of at least part of the bearing support 2 provided by the present invention gradually increases, which can meet the radial strength requirement, and the gradual increase in the radial dimension can improve the structural strength of the bearing support 2.

[0064] In the related art, the radial dimensions of the entire bearing support 2 are set to be consistent by increasing the wall thickness and additionally providing reinforcing ribs, thereby increasing the structural strength of the bearing support 2, which results in the problem of increased equipment weight and increased costs.

[0065] The inventors also found that the axial load on the bearing support 2 is greater than the radial load, and the axial load is transmitted to the bearing support 2 through the thrust bearing 4 and the thrust bearing fixing plate 5. Therefore, the first end of the bearing support 2 provided in the present invention cooperates with the thrust bearing fixing plate 5 and the thrust bearing 4, and the radial dimension of the first end of the bearing support 2 is smaller than the radial dimension of the second end of the bearing support 2 connected to the housing 1, and along the direction from the first end to the second end of the bearing support 2, the radial dimension of at least part of the bearing support 2 gradually increases, which can well transmit the axial force to the housing 1 of the compressor motor, thereby improving the strength and service life of the bearing support 2.

[0066] In some embodiments, along the direction from the first end to the second end of the bearing support 2, the radial dimension of the middle part of the bearing support 2 between the first end and the second end gradually increases. The bearing support structure can both meet the strength requirements and reliably deliver power.

[0067] In some embodiments, the bearing support 2 is V-shaped, has high structural strength, and is easy to cast, which can ensure high-precision assembly of the hydrodynamic bearing and improve the stability of the bearing rotor system.

[0068] In some embodiments, the radial dimension of the first end of the bearing support 2 is smaller than the radial dimension of the second end of the bearing support 2 .

[0069] In some embodiments, the bearing support 2 includes a bearing hole 21, and the bearing hole 21 is used to install a bearing.

[0070] In some embodiments, the bearing support 2 includes an annular groove 22 , and the annular groove 22 is arranged around the bearing hole 21 .

[0071] Optionally, the cross section of the annular groove 22 is V-shaped, matching the V-shaped structure of the bearing support 2 .

[0072] The bearing support 2 is hollowed out around the bearing hole 21 to form a V-shaped annular groove 22 to ensure that the wall thickness of the casting is relatively uniform, which reduces the deadweight of the support and facilitates casting.

[0073] In some embodiments, the inner wall of the housing 1 is provided with a mounting portion extending toward the center of the housing 1 , and the mounting portion is used to be connected to the second end of the bearing support 2 .

[0074] In some embodiments, the second end of the bearing support 2 includes a limiting portion 23, and the limiting portion 23 abuts against the inner side of the mounting portion.

[0075] In some embodiments, the second end of the bearing support 2 further includes a connecting portion 24, which extends radially outward of the bearing support 2 relative to the limiting portion 23 and is used to be connected to the mounting portion.

[0076] In some embodiments, a stopper is formed between the limiting portion 23 and the connecting portion 24 for cooperating with the mounting portion for positioning.

[0077] In some embodiments, the connecting portion 24 is connected to the mounting portion provided on the inner wall of the housing 1 via a pin, and the bearing support 2 is positioned together by the pin and the provided mounting stop, thereby ensuring high-precision assembly of the bearing.

[0078] In some embodiments, the connecting portion 24 is annular and is disposed along the circumference of the limiting portion 23 .

[0079] In some embodiments, the bearing support 2 includes a bearing hole 21, and the bearing hole 21 is used to install a bearing.

[0080] In some embodiments, the bearing support 2 includes a vent hole 25 , which is arranged along the radial direction of the bearing support 2 , wherein a first end of the vent hole 25 is connected to the bearing hole 21 , and a second end of the vent hole 25 is connected to the radial outer portion of the bearing support 2 .

[0081] In some embodiments, the compressor includes a radial bearing 3 , which is disposed in a bearing hole 21 .

[0082] Furthermore, the radial bearing 3 and the bearing support 2 are connected by interference fit.

[0083] In some embodiments, the compressor further includes a thrust bearing 4, which is disposed at the first end of the bearing support 2. The vent hole 25 connects the space where the radial bearing 3 is located with the space where the thrust bearing 4 is located, which can ensure that the working back pressures of the thrust bearing 4 and the radial bearing 3 are consistent, thereby improving the stability of the bearing rotor system.

[0084] Optionally, 4 to 12 vents 25 are evenly distributed on the bearing support 2 to connect the space where the radial bearing 3 is located with the space where the thrust bearing 4 is located, which can ensure that the radial bearing 3 and the thrust bearing 4 are in the same working environment and improve the stability of the bearing rotor system.

[0085] In some embodiments, Figure 2 As shown, the compressor includes a thrust bearing fixing plate 5, which is arranged between the thrust bearing 4 and the first end of the bearing support 2. The thrust bearing fixing plate 5 is fixedly connected to the first end of the bearing support 2. The thrust bearing 4 is fixedly connected to the thrust bearing fixing plate 5.

[0086] The thrust bearing fixing plate 5 is provided with a matching portion, which extends outward and is used to match with a hole provided on the first end portion of the bearing support 2 .

[0087] Furthermore, the bearing hole 21 arranged in the bearing support 2 includes a first hole and a second hole, the first hole is closer to the first end of the bearing support 2 relative to the second hole, the hole diameter of the first hole is larger than the hole diameter of the second hole, the radial bearing 3 is arranged in the bearing hole 21, and the gap between the radial bearing 3 and the first hole is used to accommodate the mating part arranged on the thrust bearing fixing plate 5.

[0088] The first end of the bearing support 2 is the mounting end of the thrust bearing fixing plate 5, and the thrust bearing 4 is locked on the thrust bearing fixing plate 5 by means of screws.

[0089] A radial bearing 3 is installed in the bearing hole 21 in the bearing support 2. The bearing support 2 is doubly positioned on the housing 1 of the compressor motor through a pin and a stop. The function of the vent hole 25 set on the bearing support 2 is to ensure that the working air pressure environment of the thrust bearing 4 and the radial bearing 3 is consistent.

[0090] In some embodiments, the compressor includes a rotor 8 and a stator 9. The rotor 8 is arranged along the central axis of the housing 1. The stator 9 is arranged between the inner wall of the housing 1 and the rotor 8, and is fixedly connected to the inner wall of the housing 1.

[0091] Both ends of the rotor 8 are provided with radial bearings 3 and bearing supports 2. One end of the rotor 8 is provided with a thrust bearing 4 and a thrust bearing fixing plate 5, and the radial bearing 3 is axially limited by the thrust bearing fixing plate 5.

[0092] In some embodiments, the compressor includes a thrust plate 6 and a diffuser 7. The diffuser 7 is disposed at an end of the casing 1.

[0093] The thrust plate 6 is fixed to the rotor 8 , and thrust bearings 4 are provided on opposite sides of the thrust plate 6 , wherein the thrust bearing 4 on one side is fixed to the thrust bearing fixing plate 5 , and the thrust bearing 4 on the other side is fixed to the diffuser 7 .

[0094] Further, at least one of the radial bearing 3 and the thrust bearing 4 is a gas bearing. Further, at least one of the radial bearing 3 and the thrust bearing 4 is a dynamic pressure gas bearing.

[0095] The rotating machinery supported by the hydrodynamic gas bearing has extremely high requirements on the coaxiality of the radial bearings 3 on both sides of the rotor 8. If the coaxiality is poor, the bearing performance will be reduced, and in severe cases, the rotor will not be able to float.

[0096] The bearing support 2 provided by the present invention adopts a dual positioning method of pins and stoppers in terms of positioning. The stoppers can ensure the coaxiality of the bearing after assembly, and then the pins can be used for precise positioning. The pins can be arranged horizontally or vertically, and the stoppers and pins are used to complete the final positioning to ensure the micron-level coaxiality of the two radial bearings 3.

[0097] The plurality of (for example, four) vent holes 25 provided on the bearing support 2 of the present disclosure allow the left and right sides of the bearing support 2 to communicate with each other ( Figure 1 The left and right sides of the figure are as follows: that is, the side where the thrust bearing 4 is located is the left side, and the side where the radial bearing 3 is located is the right side, ensuring that the operating back pressures of the thrust bearing 4 and the radial bearing 3 are the same and stable.

[0098] For example, for a centrifugal refrigeration compressor, the vent hole 25 can also ensure that the back pressure of the thrust bearing 4 and the radial bearing 3 is always equal to the pressure in the compressor motor cavity. The stable and uniform bearing back pressure can improve the stability of the bearing rotor system.

[0099] In summary, the bearing support 2 provided by the present invention has high structural strength and long service life; it adopts double positioning of stopper and pin, and the bearing assembly accuracy is high; the inside and outside of the bearing support 2 are connected through the vent hole 25, which improves the stability of the bearing rotor system.

[0100] In some embodiments, the compressor comprises a centrifugal refrigeration compressor.

[0101] Some embodiments provide an air conditioner, which includes the above-mentioned compressor.

[0102] In the description of the present invention, it should be understood that the use of terms such as "first", "second", and "third" to limit components is only for the convenience of distinguishing the above components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A compressor, characterized in that: include: Housing (1); as well as A bearing support (2), the bearing support (2) being arranged in the housing (1), a first end of the bearing support (2) being adjacent to an end of the housing (1), and a second end of the bearing support (2) being connected to an inner wall of the housing (1); The second end portion and the first end portion are two opposite ends along the axial direction of the bearing support (2); along the direction from the first end portion to the second end portion, the radial dimension of the middle portion of the bearing support (2) located between the first end portion and the second end portion gradually increases; The radial dimension of the first end portion is smaller than the radial dimension of the second end portion; The inner wall of the housing (1) is provided with a mounting portion extending towards the center of the housing (1) and used for connecting to the second end of the bearing support (2).

2. The compressor according to claim 1, characterized in that Also includes: A bearing hole (21) for mounting a bearing; and An annular groove (22) is arranged around the bearing hole (21).

3. The compressor according to claim 1, characterized in that The second end portion comprises: A limiting portion (23) is used to abut against the inner side of the component to be installed; and A connecting portion (24) extending radially outward of the bearing support relative to the limiting portion (23) and used for connecting to the component to be installed; A stop is formed between the limiting portion (23) and the connecting portion (24) for cooperating with the part to be installed for positioning.

4. The compressor according to claim 3, characterized in that The connecting portion (24) is annular and is arranged along the circumference of the limiting portion (23).

5. The compressor according to claim 1, characterized in that Also includes: A bearing hole (21) for mounting a bearing; and A vent hole (25) is arranged along the radial direction of the bearing support (2); a first end of the vent hole (25) is connected to the bearing hole (21); and a second end of the vent hole (25) is connected to the radial outside of the bearing support (2).

6. The compressor according to claim 1, characterized in that The second end of the bearing support (2) comprises: A limiting portion (23) abuts against the inner side of the mounting portion; and A connecting portion (24) extending radially outward of the bearing support relative to the limiting portion (23) and used for connecting to the mounting portion; A stopper is formed between the limiting portion (23) and the connecting portion (24) for cooperating with the mounting portion for positioning.

7. The compressor according to claim 1, characterized in that include: A radial bearing (3) is disposed in a bearing hole (21) of the bearing support (2); as well as A thrust bearing (4) is arranged at a first end portion of the bearing support (2); The bearing support comprises: A vent hole (25) is arranged along the radial direction of the bearing support (2), and the vent hole (25) is used to connect the space where the radial bearing (3) is located with the space where the thrust bearing (4) is located.

8. The compressor according to claim 1, characterized in that include: A radial bearing (3) is disposed in a bearing hole (21) of the bearing support (2); A thrust bearing (4) is arranged at a first end portion of the bearing support (2); and A thrust bearing fixing plate (5) is disposed between the thrust bearing (4) and the bearing support (2), and is fixedly connected to the first end of the bearing support (2) and the thrust bearing (4).

9. The compressor according to claim 8, characterized in that include: a diffuser (7) disposed at an end of the casing (1); and The thrust plate (6) has thrust bearings (4) on both opposite sides, wherein the thrust bearing (4) on one side is fixedly connected to the thrust bearing fixing plate (5), and the thrust bearing (4) on the other side is fixedly connected to the diffuser (7).

10. The compressor according to claim 8, characterized in that At least one of the radial bearing (3) and the thrust bearing (4) is a gas bearing.

11. The compressor according to claim 1, characterized in that The compressor comprises a centrifugal compressor.

12. An air conditioner, characterized in that: Comprising the compressor according to any one of claims 1 to 11.

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