Compressor and refrigeration apparatus

Abstract

The application provides a compressor and a refrigeration device. The compressor comprises a rotating shaft, a main bearing bearing the rotating shaft, and a compression assembly arranged on the rotating shaft, wherein the compression assembly comprises: a primary impeller connected to the rotating shaft; a secondary impeller connected to the rotating shaft and configured to compress exhaust gas of the primary impeller; a bearing support coaxially arranged on the rotating shaft at a radial outer side of the rotating shaft, located between the primary impeller and the secondary impeller, and comprising a diffuser structure for forming a primary diffuser passage of the primary impeller exhaust gas and a protection bearing mounting portion; and an air floating protection bearing sleeved on the rotating shaft and mounted in the protection bearing mounting portion. The compressor provides radial support for the high-speed rotating rotating shaft through the air floating protection bearing, and is beneficial to improving the safety and reliability and service life of the compressor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a compressor and refrigeration equipment. Background Technology

[0002] In compressors of related technologies, multi-stage impellers are required to meet high-pressure refrigeration requirements. However, multi-stage impellers can lead to problems such as excessively long cantilever sections, large operating deflection, and heavy bearing loads, which can affect the service life of the compressor.

[0003] The above statements are for the purpose of providing background information in relation to this application only, and do not necessarily constitute prior art. Utility Model Content

[0004] The purpose of this application is to provide a compressor and refrigeration equipment that aims to solve the problem that multi-stage impellers cause excessively long cantilever sections, large operating deflections, and heavy bearing loads, thereby affecting the service life of the compressor.

[0005] To achieve the above objectives, the first aspect of this application provides a compressor, including a rotating shaft, a main bearing supporting the rotating shaft, and a compression assembly disposed on the rotating shaft. The compression assembly includes: a primary impeller connected to the rotating shaft; a secondary impeller connected to the rotating shaft and configured to compress the exhaust gas of the primary impeller; a bearing support coaxially disposed on the radially outer side of the rotating shaft and located between the primary and secondary impellers along the axial direction of the compressor, including a protective bearing mounting portion; and an air-floating protective bearing sleeved on the rotating shaft and installed within the protective bearing mounting portion.

[0006] In some embodiments of the compressor, the main bearing is located on the side of the secondary impeller away from the primary impeller along the compressor's axial direction.

[0007] In some embodiments of the compressor, the bearing support includes a bearing support inlet passage for supplying working gas to the air flotation protection bearing; and / or the bearing support includes a bearing support exhaust passage for discharging working gas from the gap between the air flotation protection bearing and the shaft.

[0008] In some embodiments of the compressor, the air flotation protection bearing has a bearing air passage that connects the gap between the air flotation protection bearing and the rotating shaft with the air inlet air passage of the bearing support.

[0009] In some embodiments of the compressor, the bearing gas path includes multiple bearing flow channels with outlets distributed along the axial direction of the compressor.

[0010] In some embodiments of the compressor, the bearing gas passage and the bearing support inlet gas passage are correspondingly arranged to receive the working gas delivered by the corresponding bearing support inlet gas passage, and the flow area of ​​the bearing gas passage is the same as that of the corresponding bearing support inlet gas passage.

[0011] In some embodiments of the compressor, the compression assembly also includes an intake valve configured to regulate parameters of the working gas supplied to the bearing support intake passage.

[0012] In some embodiments of the compressor, the compressor further includes: a monitoring device configured to monitor suspension state information of the rotating shaft; and a controller connected to the monitoring device and the intake valve signal, configured to control the intake valve operation based on the suspension state information.

[0013] In some embodiments of the compressor, the monitoring device includes a displacement sensor configured to detect a first radial displacement of the shaft relative to the main bearing or a second radial displacement of the shaft relative to the air flotation protection bearing, the suspension state information including the first radial displacement information or the second radial displacement information.

[0014] In some embodiments of the compressor, the bearing support inlet passage is connected to the exhaust passage of the second-stage impeller; and / or the bearing support exhaust passage is connected to the exhaust passage of the first-stage impeller.

[0015] In some embodiments of the compressor, the compression assembly further includes a support ring disposed between the air flotation protection bearing and the secondary impeller along the axial direction of the compressor.

[0016] In some embodiments of the compressor, the radially outer surface of the support ring is a concave curved surface that is recessed radially inward from both ends toward the middle along the axial direction of the compressor, and the two axial ends of the concave curved surface are respectively flush with the outer edge of the end face of the bearing support and the outer edge of the end face of the secondary impeller.

[0017] In some embodiments of the compressor, a first exhaust gas passage is formed between the air flotation protection bearing and the support ring for discharging working gas from the gap between the air flotation protection bearing and the rotating shaft.

[0018] In some embodiments of the compressor, the bearing support includes a bearing support exhaust passage for discharging working gas from the air flotation protection bearing. The bearing support exhaust passage is connected to a first exhaust passage and is located downstream of the first exhaust passage in the direction of working gas discharge.

[0019] In some embodiments of the compressor, a second exhaust gas passage is formed between the air flotation protection bearing and the first-stage impeller for discharging working gas from the gap between the air flotation protection bearing and the shaft, and the second exhaust gas passage is connected to the exhaust of the first-stage impeller.

[0020] In some embodiments of the compressor, the bearing support includes: a diffuser structure configured to form a primary diffuser passage for primary impeller exhaust; and / or a guide structure configured to form a guide passage for guiding the primary impeller exhaust to flow toward the secondary impeller.

[0021] In some embodiments of the compressor, the clearance between the air flotation protection bearing and the shaft is smaller than the clearance between the main bearing and the shaft.

[0022] In some embodiments of the compressor, the clearance between the air flotation protection bearing and the shaft is 0.04 mm to 0.07 mm smaller than the clearance between the main bearing and the shaft.

[0023] In some embodiments of the compressor, two sets of compression assemblies are disposed at both axial ends of the rotating shaft.

[0024] A second aspect of this application provides a refrigeration device, including the compressor of the first aspect of this application.

[0025] By incorporating an air-bearing protective bearing, radial support is provided to the high-speed rotating shaft before the main bearing forms an oil film during normal operation or in the event of main bearing failure. This prevents direct contact between the shaft and the bearing support or other core components, thus avoiding compressor damage and improving compressor safety, reliability, and service life. Furthermore, placing the air-bearing protective bearing between the two impeller stages enhances the support of the impellers on the shaft, reducing shaft deflection and further extending the compressor's lifespan.

[0026] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the compressor structure of some embodiments of this application.

[0029] Figure 2 for Figure 1 A schematic diagram of the combined mechanism of the compressor's compression components, controller, rotating shaft, and main bearing.

[0030] Figure 3 for Figure 1 The control principle block diagram of the compressor in the embodiment shown.

[0031] Figures 1 to 2 In the figures, the labels represent:

[0032] 1. Compression assembly; 11. First-stage impeller; 12. Second-stage impeller; 13. Bearing support; 131. Bearing support inlet air passage; 132. Bearing support exhaust air passage; 133. Diffuser structure; 134. Protective bearing mounting part; 135. Guide structure; 14. Air flotation protective bearing; 15. First-stage diffuser channel; 16. Inlet valve; 17. Support ring; 171. First exhaust air passage; 18. Guide channel; 2. Monitoring device; 21. Displacement sensor; 3. Rotating shaft; 4. Cylinder; 5. Main bearing; 6. Controller; 7. Volute; 71. First internal ring plate; 72. Second internal ring plate; 8. End shell; 9. End plate; 10. Inner cover plate; L. Bearing air passage; M. Motor; S. Second exhaust air passage. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] In the description of this application, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0036] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] Furthermore, when an element is referred to as being "on" another element, the element may be directly on the other element, or it may be indirectly on the other element with one or more intermediate elements inserted between them. Additionally, when an element is referred to as being "connected" to another element, the element may be directly connected to the other element, or it may be indirectly connected to the other element with one or more intermediate elements inserted between them. In the following drawings, the same reference numerals denote the same elements.

[0038] Unless otherwise required by the content, throughout the following description, the word “including” and its variations, such as “comprising” and “having”, will be interpreted in an open-ended, inclusive sense, that is, as “including but not limited to”.

[0039] In this application, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0040] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1 middle Figure 3 As shown, the compressor in this embodiment includes a rotating shaft 3, a main bearing 5 supporting the rotating shaft 3, and a compression assembly 1 disposed on the rotating shaft 3. The compression assembly 1 includes: a primary impeller 11 connected to the rotating shaft 3; a secondary impeller 12 connected to the rotating shaft 3 and configured to compress the exhaust gas of the primary impeller 11; a bearing support 13 coaxially disposed on the radially outer side of the rotating shaft 3 and located between the primary impeller 11 and the secondary impeller 12 along the axial direction of the compressor, including a protective bearing mounting portion 134; and an air-float protective bearing 14 sleeved on the rotating shaft 3 and installed within the protective bearing mounting portion 134.

[0042] By incorporating the air-floating protective bearing 14, radial support is provided for the high-speed rotating shaft 3 before the main bearing 5 forms an oil film during normal operation or in the event of main bearing 5 failure. This prevents direct contact between the shaft 3 and other core components, thus avoiding compressor damage and improving compressor safety, reliability, and service life. Furthermore, placing the air-floating protective bearing 14 between the two impeller stages enhances the support of the shaft 3 between the two impeller stages, reducing shaft 3 deflection and thus extending compressor service life. Moreover, since the air-floating protective bearing 14 is located between the first-stage impeller 11 and the second-stage impeller 12, it also acts as an interstage seal, further improving compressor operational reliability.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, along the compressor's axial direction, the main bearing 5 is located on the side of the secondary impeller 12 opposite to the primary impeller 11.

[0044] By setting the main bearing 5 to be located on the side of the secondary impeller 12 away from the primary impeller 11, the positions of the air flotation protection bearing 14 and the main bearing 5 on the rotating shaft 3 are reasonably set, which helps to reduce the deflection deformation of the rotating shaft 3, thereby ensuring the stable and reliable operation of the compressor.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the bearing support 13 includes a bearing support inlet air passage 131 for supplying working gas to the air flotation protection bearing 14; and / or the bearing support 13 includes a bearing support exhaust air passage 132 for discharging working gas from the gap between the air flotation protection bearing 14 and the rotating shaft 3.

[0046] By setting up the bearing support inlet air passage 131, external working gas is continuously and stably delivered to the air flotation protection bearing 14, which facilitates the formation of an air film between the air flotation protection bearing 14 and the rotating shaft 3. This avoids direct contact between the air flotation protection bearing 14 and the rotating shaft 3, thus providing radial support for the high-speed rotating shaft 3 before the main bearing 5 forms an oil film during normal operation or when the main bearing 5 fails. By setting up the bearing support exhaust air passage 132, the working gas in the air flotation protection bearing 14 is discharged, ensuring that the pressure of the air film formed between the air flotation protection bearing 14 and the rotating shaft 3 remains dynamically balanced. This also helps to reduce pressure fluctuations or heat accumulation caused by working gas retention, enhancing the stability of the air film. In addition, the bearing support 13 integrates the bearing support inlet air passage 131 and / or the bearing support exhaust air passage 132, reducing the connection of complex pipelines and improving the overall sealing and integration of the compressor.

[0047] like Figure 1 and Figure 2As shown, in some embodiments of the compressor, the air flotation protection bearing 14 has a bearing air passage L that connects the gap between the air flotation protection bearing 14 and the rotating shaft 3 with the bearing support inlet air passage 131.

[0048] By setting up the bearing air passage L, the working gas from the bearing support air inlet passage 131 is guided to the gap between the bearing support air inlet passage 131 and the air float protection bearing 14 and the rotating shaft 3, thereby quickly forming a stable air film in the gap.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the bearing air passage L includes a plurality of bearing flow channels with outlets distributed along the axial direction of the compressor.

[0050] The bearing air passage L includes multiple bearing flow channels with outlets distributed along the axial direction of the compressor. This facilitates the uniform guidance of the working gas from the bearing support inlet air passage 131 to the gap between the bearing support inlet air passage 131, the air float protection bearing 14, and the rotating shaft 3. This results in a more uniform gas film formed in the gap, which helps reduce the vibration of the rotating shaft 3 during high-speed rotation and thus improves the rotational stability of the rotating shaft 3.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the bearing gas passage L is correspondingly provided with the bearing support inlet gas passage 131 to receive the working gas delivered by the corresponding bearing support inlet gas passage 131, and the flow area of ​​the bearing gas passage L is the same as the flow area of ​​the corresponding bearing support inlet gas passage 131.

[0052] The bearing air passage L is correspondingly set with the bearing support air inlet passage 131, and the flow area of ​​the bearing air passage L is the same as that of the corresponding bearing support air inlet passage 131. This ensures that the working gas flow rate remains stable when the working gas is transferred from the bearing support air inlet passage 131 to the bearing air passage L. This helps to avoid uneven shaft force and unstable suspension caused by sudden changes in flow rate, thereby improving the stability of the rotation of the shaft 3.

[0053] like Figure 2 As shown, in some embodiments of the compressor, the compression assembly 1 further includes an intake valve 16, which is configured to regulate the parameters of the working gas supplied to the bearing support intake passage 131.

[0054] By setting an intake valve 16, which can adjust the parameters of the working gas supplied to the bearing support intake air passage 131, it is beneficial to ensure that the working gas supplied to the air flotation protection bearing 14 is in the best condition, thereby facilitating the formation of a uniform and stable air film in the gap between the air flotation protection bearing 14 and the rotating shaft 3.

[0055] like Figure 2 As shown, in some embodiments of the compressor, the compressor also includes a monitoring device 2 and a controller 6. The monitoring device 2 is configured to monitor the suspension state information of the rotating shaft 3; the controller 6 is signal-connected to the monitoring device 2 and the intake valve 16, and is configured to control the intake valve 16 to operate according to the suspension state information.

[0056] By setting up monitoring device 2 and controller 6, controller 6 can control the operation of intake valve 16 according to suspension state information, so that when the suspension state information is abnormal, the operation of intake valve 16 can be quickly adjusted, thereby improving the reliability and safety of compressor operation.

[0057] The controller 6 may be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described in this disclosure.

[0058] like Figure 3 As shown, in some embodiments of the compressor, the monitoring device 2 includes a displacement sensor 21, which is configured to detect a first radial displacement information of the shaft 3 relative to the main bearing 5 or a second radial displacement information of the shaft 3 relative to the air flotation protection bearing 14. The suspension state information includes the first radial displacement information or the second radial displacement information.

[0059] The monitoring device 2 adopts the form of a displacement sensor 21, which enables the displacement sensor 21 to accurately detect when the first radial displacement information or the second radial displacement information is abnormal. As a result, the controller 6 can quickly adjust the action of the intake valve 16 based on the first radial displacement information or the second radial displacement information detected by the displacement sensor 21, thereby improving the reliability and safety of the compressor operation.

[0060] like Figure 1 As shown, in some embodiments of the compressor, the bearing support inlet passage 131 is connected to the exhaust of the second-stage impeller 12; and / or the bearing support exhaust passage 132 is connected to the exhaust of the first-stage impeller 11.

[0061] By connecting the bearing support inlet air passage 131 to the exhaust air of the second-stage impeller 12, the working gas discharged from the second-stage impeller 12 can directly enter the bearing support inlet air passage 131, thus facilitating the recycling of the working gas compressed by the compressor as the working gas for the air-float protection bearing 14. Furthermore, since no external gas source is required, the compressor structure is simplified. By connecting the bearing support exhaust air passage 132 to the exhaust air of the first-stage impeller 11, the working gas discharged from the bearing support exhaust air passage 132 can continue to enter the second-stage impeller 12 for compression, facilitating the recycling of the working gas compressed by the compressor as the working gas for the air-float protection bearing 14.

[0062] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the compression assembly 1 further includes a support ring 17, which is disposed between the air flotation protection bearing 14 and the secondary impeller 12 along the axial direction of the compressor.

[0063] By setting a support ring 17 between the air flotation protection bearing 14 and the secondary impeller 12, it is beneficial to axially position and limit the air flotation protection bearing 14 and the secondary impeller 12, and prevent the air flotation protection bearing 14 or the secondary impeller 12 from axially shifting during the rotation of the shaft 3, thereby improving the stability of the compressor operation.

[0064] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the radially outer surface of the support ring 17 is a concave curved surface that is recessed radially inward from both ends toward the middle along the axial direction of the compressor. The two axial ends of the concave curved surface are flush with the outer edge of the end face of the bearing support 13 and the outer edge of the end face of the secondary impeller 12, respectively.

[0065] By designing the radially outer surface of the support ring 17 as a concave curved surface, and having both axial ends of the concave curved surface flush with the outer edge of the end face of the bearing support 13 and the outer edge of the end face of the secondary impeller 12 respectively, a smooth transition gas flow channel is formed between the support ring 17, the bearing support 13 and the secondary impeller 12, which helps to reduce the airflow loss of the working gas when it flows through the gas flow channel, thereby improving the working efficiency of the compressor.

[0066] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, a first exhaust gas passage 171 is formed between the air flotation protection bearing 14 and the support ring 17 for discharging working gas from the gap between the air flotation protection bearing 14 and the rotating shaft 3.

[0067] The air flotation protection bearing 14 and the support ring 17 form a first exhaust gas passage 171, which eliminates the need to set an additional gas flow channel for exhausting working gas on the air flotation protection bearing 14, thereby simplifying the structure of the air flotation protection bearing 14.

[0068] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the bearing support 13 includes a bearing support exhaust passage 132 for discharging working gas from the gap between the air flotation protection bearing 14 and the rotating shaft 3. The bearing support exhaust passage 132 is connected to the first exhaust passage 171 and is located downstream of the first exhaust passage 171 in the direction of working gas discharge.

[0069] The bearing support exhaust passage 132 is connected to the first exhaust passage 171 and is located downstream of the first exhaust passage 171 along the discharge direction of the working gas. This allows the working gas in the gap between the air flotation protection bearing 14 and the rotating shaft 3 to be discharged after passing through the first exhaust passage 171 and the bearing support exhaust passage 132 in sequence. Thus, the working gas discharge channel is formed by the fit between the air flotation protection bearing 14 and the support ring 17 and the internal structure of the bearing support 13, thereby achieving dynamic stability of the gas film pressure. This helps to reduce the connection of complex pipelines and improve the overall sealing performance and integration of the compressor.

[0070] In some embodiments of the compressor, a second exhaust gas passage S is formed between the air flotation protection bearing 14 and the first-stage impeller 11 for discharging working gas from the gap between the air flotation protection bearing 14 and the rotating shaft 3. The second exhaust gas passage S is connected to the exhaust gas of the first-stage impeller 11.

[0071] By setting up a second exhaust gas path S, the working gas discharge channel is formed by utilizing the cooperation between the air flotation protection bearing 14 and the first-stage impeller 11, thereby achieving dynamic stability of the gas film pressure. This helps to reduce the connection of complex pipelines and improve the overall sealing performance and integration of the compressor.

[0072] In some embodiments of the compressor, the bearing support 13 includes a diffuser structure 133 and / or a flow guide structure 135. The diffuser structure 133 is configured to form a primary diffuser channel 15 for the exhaust gas from the primary impeller 11. The flow guide structure 135 is configured to form a guide channel 18 for guiding the exhaust gas from the primary impeller 11 toward the secondary impeller 12.

[0073] The bearing support 13 includes a diffuser structure 133 and / or a flow guide structure, which facilitates the integration of diffuser and / or flow guide functions on the bearing support 13, thereby simplifying the compressor structure and reducing assembly difficulty.

[0074] In some embodiments of the compressor, the clearance between the air flotation protection bearing 14 and the rotating shaft 3 is smaller than the clearance between the main bearing 5 and the rotating shaft 3.

[0075] The clearance between the air-bearing protective bearing 14 and the rotating shaft 3 is smaller than the clearance between the main bearing 5 and the rotating shaft 3. This allows the air-bearing protective bearing 14 to establish a support relationship with the rotating shaft 3 before the main bearing 5. For example, when the main bearing 5 is a gas bearing or an oil film bearing, it can establish an air film with the rotating shaft 3 before the main bearing 5. Thus, when the compressor is just starting to work and the air film or oil film of the main bearing 5 has not yet formed, the air-bearing protective bearing 14 provides support for the rotating shaft 3, thereby preventing the rotating shaft 3 from directly contacting the main bearing 5 and other core components, thus preventing damage to the compressor.

[0076] In some embodiments of the compressor, the clearance between the air flotation protection bearing 14 and the rotating shaft 3 is 0.04 mm to 0.07 mm smaller than the clearance between the main bearing 5 and the rotating shaft 3.

[0077] The clearance between the air-bearing protective bearing 14 and the rotating shaft 3 is 0.04mm~0.07mm smaller than that between the main bearing 5 and the rotating shaft 3. This allows the air-bearing protective bearing 14 to support the rotating shaft 3 before the main bearing 5, thus preventing direct contact between the rotating shaft 3 and the main bearing 5 and other core components. At the same time, the main bearing 5 can promptly and stably assume the function of supporting the rotating shaft 3, sharing the load with the air-bearing protective bearing 14. Furthermore, because the air-bearing protective bearing 14 can absorb vibration and impact, it helps improve the stability and accuracy of the rotating shaft 3 during rotation, thereby helping to maintain the stable operation of the compressor.

[0078] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, there are two sets of compression components 1 disposed at both ends of the axial direction of the rotating shaft 3.

[0079] By setting two sets of compression components 1 at both ends of the shaft 3, the output of the compressor is improved, and the left and right symmetry of the compressor structure is achieved. This helps to counteract the axial loads applied to the shaft 3 by components such as the first-stage impeller 11 and the second-stage impeller 12, reduce the vibration and wear of the shaft 3, and thus improve the life of the compressor.

[0080] The refrigeration equipment of this application includes the compressor of this application.

[0081] The refrigeration device of this application embodiment has the same advantages as the compressor of this application embodiment.

[0082] The following combination Figures 1 to 3 The compressor of the present application embodiment will be described in more detail.

[0083] The compressor in this embodiment is a centrifugal compressor for refrigeration equipment, used to compress refrigerant. For example... Figures 1 to 3As shown, the compressor includes a cylinder 4, a volute 7, an end shell 8, a motor M, an end plate 9, an inner cover plate 10, a rotating shaft 3, a main bearing 5 that supports the rotating shaft 3, two sets of compression components 1 set at both ends of the rotating shaft 3, a displacement sensor 21 and a controller 6 serving as monitoring devices 2.

[0084] The motor M is located inside the cylinder 4, with its rotor and stator mounted on the shaft 3 and cylinder 4, respectively. Two end plates 9 are fixed to the axial ends of the cylinder 4. Two volutes 7 are connected to the ends of the cylinder 4, and two end shells 8 are connected to the outer axial ends of the two volutes 7. Two inner cover plates 10 are located on the inner axial sides of the end shells 8. Two sets of compression assemblies 1 are mounted on the axial ends of the shaft 3. Each compression assembly 1 is located within the space enclosed by the corresponding end volute 7, end plate 9, and end shell 8. Two main bearings 5 ​​are located on the inner axial sides of the two compression assemblies 1.

[0085] The compression assembly 1 includes a primary impeller 11, a secondary impeller 12, a bearing support 13, an air flotation protective bearing 14, an intake valve 16, and a support ring 17.

[0086] The primary impeller 11 and the secondary impeller 12 are connected to the rotating shaft 3. The secondary impeller 12 is used to compress the exhaust gas from the primary impeller 11. The primary impeller 11 is located axially outside the secondary impeller 12. Along the axial direction of the compressor, the main bearing 5 is located on the side of the secondary impeller 12 opposite to the primary impeller 11.

[0087] Along the axial direction of the compressor, the support ring 17 is disposed between the air-float protection bearing 14 and the secondary impeller 12. The radially outer surface of the support ring 17 is a concave curved surface that is recessed radially inward from both ends toward the middle along the axial direction of the compressor. The two axial ends of the concave curved surface are flush with the outer edge of the end face of the bearing support 13 and the outer edge of the end face of the secondary impeller 12, respectively.

[0088] The bearing support 13 is coaxially disposed on the radially outer side of the rotating shaft 3 and fixedly mounted on the volute 7, located between the first-stage impeller 11 and the second-stage impeller 12. It includes a diffuser structure 133 for forming a first-stage diffuser channel 15 for the exhaust gas from the first-stage impeller 11, a guide structure 135 for forming a guide channel 18 to guide the exhaust gas from the first-stage impeller 11 to the second-stage impeller 12, and a bearing mounting portion 134. The bearing support 13 includes a bearing support inlet air passage 131 for supplying working gas to the air-float protective bearing 14 and a bearing support exhaust air passage 132 for discharging working gas from the gap between the air-float protective bearing 14 and the rotating shaft 3.

[0089] In this embodiment, the diffuser structure 133 of the bearing support 13 and the inner cover plate 10 at the corresponding end form a primary diffuser channel 15. The guide structure 135 of the bearing support 13 and the first inner ring plate 71 of the volute 7 form a guide channel 18. The second inner ring plate 72 of the volute 7 and the end plate 9 form a second diffuser channel.

[0090] An air-bearing protective bearing 14 is sleeved on the rotating shaft 3 and installed within the protective bearing mounting part 134. The clearance between the air-bearing protective bearing 14 and the rotating shaft 3 is smaller than the clearance between the main bearing 5 and the rotating shaft 3. The clearance between the air-bearing protective bearing 14 and the rotating shaft 3 is 0.04mm to 0.07mm smaller than the clearance between the main bearing 5 and the rotating shaft 3. The clearance between the air-bearing protective bearing 14 and the rotating shaft 3 refers to the clearance between the air-bearing protective bearing 14 and the rotating shaft 3 in the unsuspended state, corresponding to the diameter difference between the radial inner surface of the air-bearing protective bearing 14 and the radial outer surface of the section of the rotating shaft 3 that mates with the air-bearing protective bearing 14. The clearance between the main bearing 5 and the rotating shaft 3 refers to the clearance between the main bearing 5 and the rotating shaft 3 in the unsuspended state, corresponding to the diameter difference between the radial inner surface of the main bearing 5 and the radial outer surface of the section of the rotating shaft 3 that mates with the main bearing 5.

[0091] The air-float protection bearing 14 has a bearing air passage L that connects the bearing support inlet air passage 131 with the gap between the air-float protection bearing 14 and the rotating shaft 3. The bearing air passage L includes three bearing flow channels with outlets distributed along the axial direction of the compressor. The bearing air passage L is correspondingly arranged with the bearing support inlet air passage 131 to receive the working gas delivered by the bearing support inlet air passage 131, and the flow area of ​​the bearing air passage L is the same as that of the bearing support inlet air passage 131.

[0092] The intake valve 16 is connected to the bearing support intake air passage 131 and is used to adjust the parameters of the working gas supplied to the bearing support intake air passage 131.

[0093] The displacement sensor 21 is used to detect the first radial displacement information of the shaft 3 relative to the main bearing 5 or the second radial displacement information of the shaft 3 relative to the air-bearing protective bearing 14.

[0094] The controller 6 is connected to the displacement sensor 21 and the intake valve 16, and controls the intake valve 16 to operate according to the first radial displacement information or the second radial displacement information.

[0095] The bearing support exhaust passage 132 is connected to the guide channel 18 to guide the working gas discharged from the gap between the air flotation protection bearing 14 and the rotating shaft 3 into the exhaust of the first-stage impeller 11. The guide structure 135 includes, for example, a plurality of guide vanes evenly distributed radially.

[0096] A first exhaust passage 171 is formed between the air bearing 14 and the support ring 17 for discharging working gas from the gap between the air bearing 14 and the shaft 3. The first exhaust passage 171 is, for example, the gap between the air bearing 14 and the support ring 17. A bearing support exhaust passage 132 communicates with the first exhaust passage 171 and is located downstream of the first exhaust passage 171 along the discharge direction of the working gas. In embodiments not shown, the first exhaust passage 171 may also include a channel provided on the air bearing 14 or the support ring 17.

[0097] A second exhaust gas path S is formed between the air flotation protection bearing 14 and the first-stage impeller 11 to discharge working gas from the gap between the air flotation protection bearing 14 and the rotating shaft 3. The second exhaust gas path S is connected to the exhaust of the first-stage impeller 11. For example, the second exhaust gas path S can be the gap between the air flotation protection bearing 14 and the first-stage impeller 11. Part of the working gas can be discharged to the first-stage diffuser channel 15 through the gap between the air flotation protection bearing 14 and the first-stage impeller 11. In an embodiment not shown, the second exhaust gas path S may also include a channel provided on the air flotation protection bearing 14 or the first-stage impeller 11.

[0098] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A compressor, characterized in that, It includes a rotating shaft (3), a main bearing (5) supporting the rotating shaft (3), and a compression assembly (1) disposed on the rotating shaft (3), wherein the compression assembly (1) includes: A first-stage impeller (11) is connected to the rotating shaft (3); The second-stage impeller (12), connected to the rotating shaft (3), is configured to compress the exhaust gas of the first-stage impeller (11); The bearing support (13) is coaxially disposed on the radially outer side of the rotating shaft (3) and located between the first-stage impeller (11) and the second-stage impeller (12) along the axial direction of the compressor, including a protective bearing mounting part (134). An air-bearing protective bearing (14) is sleeved on the rotating shaft (3) and installed in the protective bearing mounting part (134).

2. The compressor according to claim 1, characterized in that, Along the axial direction of the compressor, the main bearing (5) is located on the side of the secondary impeller (12) away from the primary impeller (11).

3. The compressor according to claim 1, characterized in that, The bearing support (13) includes a bearing support air inlet passage (131) for supplying working gas to the air flotation protective bearing (14); and / or The bearing support (13) includes a bearing support exhaust passage (132) for discharging working gas from the gap between the air flotation protection bearing (14) and the rotating shaft (3).

4. The compressor according to claim 3, characterized in that, The air flotation protection bearing (14) has a bearing air passage (L) that connects the gap between the air flotation protection bearing (14) and the rotating shaft (3) with the bearing support air inlet passage (131).

5. The compressor according to claim 4, characterized in that, The bearing air passage (L) includes multiple bearing flow channels with outlets distributed along the axial direction of the compressor.

6. The compressor according to claim 4, characterized in that, The bearing air passage (L) is configured to receive the working gas delivered by the corresponding bearing support air inlet passage (131) in a corresponding manner. The flow area of ​​the bearing air passage (L) is the same as that of the corresponding bearing support air inlet passage (131).

7. The compressor according to claim 3, characterized in that, The compression assembly (1) also includes an intake valve (16) configured to regulate the parameters of the working gas supplied to the bearing support intake passage (131).

8. The compressor according to claim 7, characterized in that, The compressor also includes: Monitoring device (2) is configured to monitor the suspension state information of the rotating shaft (3); and The controller (6) is signal-connected to the monitoring device (2) and the intake valve (16) and is configured to control the intake valve (16) to operate according to the suspension state information.

9. The compressor according to claim 8, characterized in that, The monitoring device (2) includes a displacement sensor (21) configured to detect a first radial displacement information of the shaft (3) relative to the main bearing (5) or a second radial displacement information of the shaft (3) relative to the air flotation protection bearing (14), wherein the suspension state information includes the first radial displacement information or the second radial displacement information.

10. The compressor according to claim 3, characterized in that, The bearing support air inlet passage (131) is connected to the exhaust passage of the secondary impeller (12); and / or The exhaust passage (132) of the bearing support is connected to the exhaust passage of the first-stage impeller (11).

11. The compressor according to claim 1, characterized in that, The compression assembly (1) also includes a support ring (17) along the axial direction of the compressor, the support ring (17) being disposed between the air flotation protection bearing (14) and the secondary impeller (12).

12. The compressor according to claim 11, characterized in that, The radially outer surface of the support ring (17) is a concave curved surface that is recessed radially inward from both ends toward the middle along the axial direction of the compressor. The two axial ends of the concave curved surface are respectively flush with the outer edge of the end face of the bearing support (13) and the outer edge of the end face of the secondary impeller (12).

13. The compressor according to claim 11, characterized in that, A first exhaust gas passage (171) is formed between the air flotation protection bearing (14) and the support ring (17) for discharging working gas from the gap between the air flotation protection bearing (14) and the rotating shaft (3).

14. The compressor according to claim 13, characterized in that, The bearing support (13) includes a bearing support exhaust passage (132) for discharging working gas from the air flotation protection bearing (14). The bearing support exhaust passage (132) is connected to the first exhaust passage (171) and is located downstream of the first exhaust passage (171) along the discharge direction of the working gas.

15. The compressor according to claim 1, characterized in that, A second exhaust gas passage (S) is formed between the air flotation protection bearing (14) and the first-stage impeller (11) for discharging working gas from the gap between the air flotation protection bearing (14) and the rotating shaft (3). The second exhaust gas passage (S) is connected to the exhaust of the first-stage impeller (11).

16. The compressor according to any one of claims 1 to 14, characterized in that, The bearing support (13) includes: The diffuser structure (133) is configured to form a first-stage diffuser channel (15) for the exhaust of the first-stage impeller (11); and / or The flow guide structure (135) is configured to form a guide channel (18) that guides the exhaust gas from the first-stage impeller (11) to flow toward the second-stage impeller (12).

17. The compressor according to any one of claims 1 to 14, characterized in that, The gap between the air-bearing protective bearing (14) and the rotating shaft (3) is smaller than the gap between the main bearing (5) and the rotating shaft (3).

18. The compressor according to claim 15, characterized in that, The gap between the air-bearing protective bearing (14) and the rotating shaft (3) is 0.04mm~0.07mm smaller than the gap between the main bearing (5) and the rotating shaft (3).

19. The compressor according to any one of claims 1 to 14, characterized in that, It includes two sets of compression components (1) disposed at both ends of the axial direction of the rotating shaft (3).

20. A refrigeration device, characterized in that, The compressor includes any one of claims 1 to 19.

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