Compressor and refrigerant circulation system

Abstract

The present invention discloses a compressor and a refrigerant circulation system, and relates to the field of compressors. The compressor includes an impeller, a thrust bearing, and a diffuser. One side of the diffuser abuts against the impeller, and the other side is provided with an axial inner concave portion, and the bottom surface of the axial inner concave portion abuts against the thrust bearing. The above technical solution uses a diffuser to directly position the thrust bearing, which effectively alleviates the problems of large bearing load and low bending mode critical speed caused by the excessive length of the rotor, and also greatly reduces the difficulty of processing and assembly, improves assembly efficiency and assembly accuracy, and improves the reliability and stability of the bearing rotor system.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a compressor and a refrigerant circulation system. 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 suitable for high speed and high precision occasions and have broad application prospects in centrifugal compressors, especially miniaturized centrifugal compressors.

[0003] The inventors have discovered that the prior art suffers from at least the following issues: Hydrodynamic bearings have inherent drawbacks. First, due to the low viscosity of gas and the lack of an external gas supply, hydrodynamic bearings have low load capacity. Second, the bearing clearances of hydrodynamic bearings are on the order of microns or tens of microns, requiring extremely high machining and assembly precision. Summary of the Invention

[0004] The present invention provides a compressor and a refrigerant circulation system for optimizing the structure of the compressor.

[0005] An embodiment of the present invention provides a compressor, comprising:

[0006] impeller;

[0007] thrust bearings; and

[0008] The diffuser has a side surface on one side abutting against the impeller and an axial inner concave portion on the other side, and the bottom surface of the axial inner concave portion abuts against the thrust bearing.

[0009] In some embodiments, a sealing member is provided on an inner wall of the through hole of the diffuser.

[0010] In some embodiments, the seal comprises sealing comb teeth.

[0011] In some embodiments, the diffuser is integral with the seal.

[0012] In some embodiments, the compressor further comprises:

[0013] The cylinder is connected to the diffuser and is positioned by the positioning stop of the diffuser.

[0014] In some embodiments, the diffuser is cast.

[0015] In some embodiments, a main shaft is installed in the through hole of the diffuser, and the material of the diffuser is softer than that of the main shaft.

[0016] In some embodiments, the diffuser has a thickness less than 14 mm.

[0017] In some embodiments, the thrust bearing comprises an air bearing.

[0018] Another embodiment of the present invention provides a refrigerant circulation system, including the compressor provided by any technical solution of the present invention.

[0019] In some embodiments, the refrigerant circulation system includes an air conditioner.

[0020] The above technical solution uses a diffuser to directly position the thrust bearing, effectively alleviating the problems of heavy bearing load and low bending mode critical speed caused by the excessive rotor length. It also greatly reduces the difficulty of processing and assembly, improves assembly efficiency and assembly accuracy, and enhances the reliability and stability of the bearing-rotor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic cross-sectional view of a diffuser in a compressor provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the main structure of a diffuser in a compressor provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a partial cross-sectional structure of a compressor provided by an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of a compressor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following combination Figures 1 to 4 The technical solution provided by the present invention is described in more detail.

[0027] See also Figures 1 to 3 An embodiment of the present invention provides a compressor including an impeller 1, a thrust bearing 2, and a diffuser 3. The diffuser 3 has a side surface 31 that abuts the impeller 1 and an axial recess 32 on the other side. The bottom surface of the axial recess 32 abuts the thrust bearing 2. A thrust plate 7 is provided on the other side of the thrust bearing 2.

[0028] The diffuser 3 integrates the function of a thrust bearing retaining plate. The bottom surface of the axial recess 32 of the diffuser 3 directly abuts the thrust bearing 2, providing a positioning mechanism. The thrust bearing 2 is directly secured by screws, withstanding the rotor's axial forces. The bottom surface of the axial recess 32 of the diffuser 3 serves as the retaining surface for the thrust bearing 2. This retaining surface boasts high verticality, ensuring a uniform air film between the thrust plate 7 and the thrust bearing 2. This ensures uniform force distribution across the thrust bearing 2, minimizing wear and extending its service life.

[0029] The compressor provided by the above technical solution reduces the number of parts and improves quality control due to the adoption of the diffuser 3 with the above structure. While meeting the functional requirements, the thickness of the thrust bearing fixing plate is reduced, thereby reducing the rotor length. This not only improves the stiffness of the rotor and increases the critical speed of the bending mode of the bearing-rotor system, but also reduces the rotor weight and reduces the bearing load, thereby improving the stability of the bearing-rotor system.

[0030] In some embodiments, a sealing member 4 is provided on the inner wall of the through hole of the diffuser 3 .

[0031] The diffuser 3 converts the velocity energy of the medium at the outlet of the impeller 1 into pressure energy. A seal 4 is provided on the inner wall of the through hole of the diffuser 3. The seal 4 cooperates with the rotor to form a shaft seal to prevent the exhaust gas of the impeller 1 from entering the motor cavity.

[0032] In some embodiments, the seal 4 comprises sealing comb teeth.

[0033] In some embodiments, the diffuser 3 and seal 4 are integrated. This structure integrates the seal 4, thrust bearing mounting plate, and existing diffuser into a single component, resulting in a high degree of integration, a reduced number of parts, and improved quality control. This reduces the length of these components while meeting functional requirements, thereby shortening the rotor length. This not only increases rotor stiffness and the critical speed of the bearing-rotor system's bending mode, but also reduces rotor weight and reduces bearing loads. These two factors together improve the stability of the bearing-rotor system.

[0034] In some embodiments, the compressor further includes a cylinder 5 , which is connected to the diffuser 3 and positioned by a positioning stop 33 of the diffuser 3 .

[0035] During assembly, first fix the thrust bearing 2 to the diffuser 3 with screws, then position the diffuser 3 on the motor cylinder 5 through the stopper, and then accurately position it with pins. The above structure realizes the precise positioning and assembly of the diffuser and cylinder 5.

[0036] The coaxiality of the diffuser 3 shaft seal part and the verticality of the thrust bearing 2 fixing surface are both ensured on one part, which not only reduces the difficulty of processing and assembly, but also greatly reduces the cumulative dimensional tolerance and form and position errors of processing and assembly.

[0037] Furthermore, compared to multiple parts, a single component has only one assembly datum, improving assembly accuracy and efficiency. The high coaxiality accuracy of the comb seal reduces the chance of wear between the comb seal and the rotor during operation, minimizing the increase in seal gaps and leakage losses, thereby improving compressor energy efficiency.

[0038] In some embodiments, the diffuser 3 is cast, and the diffuser 3 and the seal 4 are integrally cast, thereby improving production efficiency.

[0039] In some embodiments, a main shaft 6 is installed in the through hole of the diffuser 3 , and the material of the diffuser 3 is softer than that of the main shaft 6 .

[0040] During operation, when wear occurs, the diffuser 3 is worn, and the main shaft 6 is not worn or is less worn. The above structure plays a role in protecting the main shaft 6.

[0041] In some embodiments, the thickness of the diffuser 3 is less than 14 mm. The thickness of the diffuser 3 is significantly reduced compared to the total thickness of the thrust bearing fixing plate of the existing diffuser 3, thereby achieving lightweighting of the compressor.

[0042] In some embodiments, the thrust bearing 2 comprises an air bearing, which does not require lubricating oil and effectively prevents the equipment from polluting the medium and the working environment.

[0043] Another embodiment of the present invention provides a refrigerant circulation system, including the compressor provided by any technical solution of the present invention.

[0044] 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 to 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 cannot be understood as limiting the protection content of the present invention.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A compressor, characterized in that: include: Impeller (1); Thrust bearing (2); A diffuser (3), wherein one side surface (31) abuts against the impeller (1), and the other side is provided with an axial inner recess (32), and the bottom surface of the axial inner recess (32) abuts against the thrust bearing (2); and A cylinder (5) connected to the diffuser (3) and positioned by a positioning stop (33) of the diffuser (3); The thickness of the diffuser (3) is less than 14 mm.

2. The compressor according to claim 1, characterized in that A sealing member (4) is provided on the inner wall of the through hole of the diffuser (3).

3. The compressor according to claim 2, characterized in that The sealing element (4) comprises sealing comb teeth.

4. The compressor according to claim 2, characterized in that The diffuser (3) and the sealing element (4) are integrated.

5. The compressor according to claim 1, characterized in that The diffuser (3) is cast.

6. The compressor according to claim 1, characterized in that A main shaft (6) is installed in the through hole of the diffuser (3), and the material of the diffuser (3) is softer than the material of the main shaft (6).

7. The compressor according to claim 1, characterized in that The thrust bearing (2) comprises an air suspension bearing.

8. A refrigerant circulation system, characterized in that: A compressor comprising any one of claims 1-7.

9. The refrigerant circulation system according to claim 8, characterized in that: The refrigerant circulation system includes an air conditioner.

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