Scroll casing assembly and compressor

Abstract

The present application relates to the technical field of compressor, and particularly relates to a volute assembly and a compressor. The volute assembly has two directions of radial and axial, and defines a compression cavity. The compression cavity includes an inlet channel, a gas collecting chamber and a pressurizing chamber along an airflow path in sequence. The inlet channel allows the gas to enter the volute assembly in a radial or near-radial direction, which is conducive to the compactness of the structure arrangement of the compressor. A flow guide is arranged in the volute assembly, and the flow guide is arranged in the gas collecting chamber and is configured as a flow guide surface on the side facing the gas collecting chamber. The flow guide surface extends in the axial direction and has oppositely arranged first and second ends. In the embodiment, when the gas enters the gas collecting chamber from the inlet channel in the radial or near-radial direction, the gas can be gradually deflected to flow in the axial direction under the guidance of the flow guide surface, so as to smoothly enter the impeller arranged in the axial direction in the pressurizing chamber, and the consistency and stability of the inlet direction are improved.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more particularly to a volute assembly and a compressor. Background Technology

[0002] Compressors, as key equipment for fluid transport and energy conversion, are widely used in various fields such as HVAC, industrial refrigeration, and gas compression. To meet the requirements of compact structure and flexible layout, some compressors adopt radial air intake, that is, the airflow enters the compressor interior in a direction perpendicular to the axis of rotation.

[0003] However, existing radial air intake structures have significant shortcomings in airflow guidance. Because the airflow needs to change from radial to axial within a short distance, its flow path is usually abrupt, easily forming vortices and streamline turbulence, leading to the following technical problems:

[0004] 1. Poor flow uniformity before the airflow enters the impeller can easily lead to local flow deviation, resulting in uneven load on different working areas of the impeller;

[0005] 2. Significant flow losses occur during the change of airflow direction, reducing intake efficiency;

[0006] 3. An unstable intake airflow field will cause an increase in the additional load on the impeller, affecting the performance and service life of the compressor. Summary of the Invention

[0007] The objective of this invention is to at least solve the problem of optimizing the intake flow path in the intake structure of a compressor with radial air intake. This objective is achieved through the following technical solution:

[0008] This invention proposes a volute assembly having radial and axial dimensions, defining a compression chamber. The compression chamber includes an air inlet, an air collection chamber, and a pressurization chamber connected sequentially. The pressurization chamber extends along the axial direction and is used to accommodate an impeller. The air inlet extends along a first direction, which is either in the same plane as the axial direction and intersects with it, or the first direction is in a different plane from the axial direction and is spaced apart from it.

[0009] The volute assembly further includes a flow guide, which is disposed in the gas collection chamber. One side of the flow guide facing the gas collection chamber is configured as a flow guide surface, and along the axial direction, the flow guide surface has a first end and a second end arranged opposite to each other. From the first end to the second end, the outer diameter of the flow guide surface gradually decreases, and the first end is disposed away from the pressurization chamber compared to the second end.

[0010] According to the volute assembly of the present invention, the airflow path is guided by a compression chamber defined by the volute, which sequentially includes an inlet duct, a gas collecting chamber, and a pressurization chamber. Specifically, external gas first enters the inlet duct, which extends along a first direction. This first direction is parallel to the radial direction of the rotating shaft or at an angle less than 90°, thus introducing the gas into the volute in a radial or off-radial direction. Then, the gas enters the gas collecting chamber from the inlet duct, where its flow direction is adjusted before entering the impeller. The present invention provides a guide member in the gas collecting chamber, which has a guide surface facing the gas collecting chamber. The guide surface extends axially, with a large outer diameter at its first end and a small outer diameter at its second end, forming a converging guide cone structure. Guided by the guide surface, the airflow gradually changes from the radial or off-radial direction to the axial direction, thus achieving a smooth transition in airflow direction. After being rectified by the guide member, the gas direction is essentially aligned with the rotating shaft axis, smoothly entering the axially arranged pressurization chamber and being drawn in by the impeller housed therein. The impeller transfers energy to the gas through high-speed rotation, achieving dynamic pressure increase and compression. Through the aforementioned structural design, the guide vane directs the airflow entering from the inlet in a radial or near-radial direction towards a gradually axial flow, ultimately allowing it to smoothly enter the impeller in the pressurization chamber. This effectively improves the airflow path, achieves a smooth transition in airflow direction, reduces turbulence and energy loss, and enhances the compressor's intake efficiency and aerodynamic performance.

[0011] In addition, the volute assembly according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, the guide surface comprises a plurality of sequentially connected arc segments in the direction from the first end to the second end, wherein the radii of two adjacent arc segments are different.

[0013] In some embodiments of the invention, two adjacent arc segments are connected tangentially.

[0014] In some embodiments of the present invention, at least one set of two adjacent arc segments are provided with a straight line segment, and the two arc segments are connected by the straight line segment.

[0015] In some embodiments of the present invention, along the axial direction, a bearing mounting groove is provided at one end of the guide member away from the gas collecting chamber, and the bearing mounting groove is used to install and protect the bearing.

[0016] Along the radial direction, at least a portion of the bearing mounting groove overlaps with the gas collecting chamber.

[0017] In some embodiments of the present invention, the end of the guide member away from the gas collecting chamber is further provided with a bearing housing mounting groove, the bearing housing mounting groove is arranged around the bearing mounting groove, and the bearing housing mounting groove is used to install and protect the bearing housing.

[0018] In some embodiments of the present invention, the bearing housing mounting groove is a stepped groove, which is gradually recessed from the first end to the second end.

[0019] In some embodiments of the present invention, the volute assembly includes a connected volute body and an intake housing, the volute body defining the intake passage, the intake housing defining the air collection chamber, and the volute and the intake housing together defining the pressurization chamber;

[0020] One end of the air collecting chamber along the axial direction is connected to the pressurization chamber, the air inlet passage penetrates the inner wall of the air collecting chamber along the radial direction, the air inlet passage extends along the radial direction, and at least a portion of the air inlet passage overlaps with the air collecting chamber along the radial direction.

[0021] In some embodiments of the present invention, the gas collecting chamber and the pressurizing chamber have a communication port, the air inlet is provided with an air inlet at one end of the air inlet along the radial direction away from the gas collecting chamber, the communication port has a first axis, the air inlet has a second axis, the first axis is parallel to the axial direction, and the first axis intersects the second axis.

[0022] In some embodiments of the present invention, the volute assembly further includes a flow divider extending along the second axis, the flow divider being located within the compression chamber and disposed between the communication port and the air inlet.

[0023] In some embodiments of the present invention, the volute assembly further includes an exhaust duct that extends circumferentially along the volute body, one end of the exhaust duct being connected to the pressurization chamber, and the other end of the exhaust duct forming an exhaust port.

[0024] In some embodiments of the present invention, the volute assembly further includes at least one guide rib disposed in the air collection chamber and located outside the communication port around the first axis. The guide rib is inclined relative to the second axis, and the first end of the guide rib extends to the circumferential edge of the communication port. Along the direction of the second axis, the distance from the second end of the guide rib to the air inlet is less than the distance from the first end of the guide rib to the air inlet.

[0025] In some embodiments of the present invention, the guide ribs are arranged in pairs, and each pair of guide ribs is symmetrically arranged with the second axis as the axis of symmetry.

[0026] In some embodiments of the present invention, the first end of the guide extends toward the direction away from the air collection chamber to form a connecting portion, and the outer peripheral wall of the connecting portion abuts against the inner peripheral wall of the air intake housing.

[0027] In some embodiments of the present invention, a blind hole is provided on the end face of the connecting part away from the gas collecting chamber, and the blind hole is used for plugging in the connecting structure.

[0028] In some embodiments of the present invention, the guide member is provided with a through hole for cooperating with a rotating shaft, and a sealing structure is provided on the circumferential inner wall of the through hole, the sealing structure being used for rotational sealing cooperation with the circumferential outer wall of the rotating shaft.

[0029] In some embodiments of the present invention, the circumferential inner wall of the flow guide is provided with at least two coaxially arranged annular grooves, and all the annular grooves are arranged sequentially at intervals along the axial direction and are separated into multiple comb-tooth structures on the circumferential inner wall of the flow guide.

[0030] The present invention also proposes a compressor, including a housing, a magnetic bearing housing connected to the housing, and a protective bearing housing connected to the magnetic bearing housing;

[0031] The aforementioned volute assembly is connected to the housing, and the guide member of the volute assembly is connected to the protective bearing seat. The guide member and the protective bearing seat together form a mounting cavity, and the protective bearing is provided inside the mounting cavity. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 A schematic diagram of the structure of a volute assembly according to an embodiment of the present invention is shown.

[0034] Figure 2 A schematic cross-sectional view of the volute assembly along the radial direction is shown according to an embodiment of the present invention.

[0035] Figure 3 A schematic cross-sectional view of the volute assembly according to an embodiment of the present invention is shown.

[0036] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0037] The attached figures are labeled as follows:

[0038] 25. Volute assembly; 2501. Intake duct; 25011. Intake port; 25012. Second axis; 2502. Air collection chamber; 25021. Connecting port; 25022. First axis; 2503. Pressurization chamber; 2504. Exhaust duct; 25041. Exhaust port; 251. Volute body; 252. Intake housing; 253. Guide element; 2531. Through hole; 2532. Sealing structure; 25321. Annular groove; 2533. Bearing mounting groove; 2534. Bearing seat mounting groove; 2535. Connecting part; 254. Flow divider; 2541. First segment; 2542. Second segment; 256. Flow guide rib; 257. Guide surface; 2571. First guide surface; 2572. Second guide surface;

[0039] 1. Compressor; 11. Housing; 12. Magnetic bearing housing; 13. Protective bearing housing; 14. Shaft; 15. Impeller; 16. Protective bearing body. Detailed Implementation

[0040] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0041] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0042] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0043] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0044] like Figures 1 to 4 As shown, this embodiment provides a volute assembly 25, which has radial and axial directions and defines a compression chamber. The compression chamber, along the airflow path, sequentially includes an inlet duct 2501, a gas collecting chamber 2502, and a pressurization chamber 2503, with the pressurization chamber 2503 accommodating the impeller 15. When gas enters the compression chamber, it first passes through the inlet duct 2501, then enters the gas collecting chamber 2502, and finally is introduced into the pressurization chamber 2503 where it is compressed by the impeller 15. The inlet duct 2501 extends along a first direction, which is coplanar with and intersects the axial direction (i.e., the first direction is parallel to the radial direction), or the first direction is in a different plane from the axial direction and spaced apart from it (i.e., the first direction forms an angle of less than 90° with the radial direction). This allows gas to enter the volute assembly 25 radially or near-radially, which is beneficial for the compactness of the compressor 1's structural arrangement. The pressurization chamber 2503 is arranged axially to accommodate the axially inlet impeller 15.

[0045] To optimize the airflow path from the inlet 2501 to the impeller 15, a guide member 253 is provided in the volute assembly 25. The guide member 253 is located within the gas collection chamber 2502, and its side facing the gas collection chamber 2502 is configured as a guide surface. The guide surface extends axially and has a first end and a second end arranged opposite each other. The outer diameter of the guide surface gradually decreases from the first end to the second end, forming a conical or converging guide structure. In this embodiment, the first end is closer to the inlet 2501 and away from the pressurization chamber 2503 than the second end, while the second end is arranged facing the pressurization chamber 2503. With the above structural design, when gas enters the gas collection chamber 2502 from the inlet 2501 in a radial or off-radial direction, it can be gradually deflected into an axial flow under the guidance of the guide surface, thereby smoothly entering the impeller 15 arranged axially in the pressurization chamber 2503, improving the consistency and stability of the intake direction. The guide element 253 ensures that the airflow forms a continuous and smooth transition path before entering the impeller 15 from the inlet 25011, avoiding the problems of turbulence, energy loss and aerodynamic efficiency reduction caused by abrupt changes in direction in traditional structures, and improving the overall compression performance.

[0046] According to the volute assembly 25 of this embodiment, the airflow path is guided by the compression chamber defined by the volute, which sequentially includes an inlet duct 2501, a gas collecting chamber 2502, and a pressurization chamber 2503. Specifically, external gas first enters the inlet duct 2501, which extends along a first direction. This first direction is parallel to the radial direction of the rotating shaft 14 or forms an angle of less than 90°, thus introducing the gas into the volute in a radial or off-radial direction. Then, the gas enters the gas collecting chamber 2502 from the inlet duct 2501, and its flow direction is adjusted within the gas collecting chamber 2502 before entering the impeller 15. The present invention provides a guide member 253 in the gas collecting chamber 2502. This guide member 253 has a guide surface on the side facing the gas collecting chamber 2502, extending axially. Its first end has a large outer diameter, and its second end has a small outer diameter, forming a converging guide cone structure. Guided by the guide surface, the airflow gradually changes from a radial or near-radial direction to an axial direction, thus achieving a smooth transition in airflow direction. After being rectified by the guide element 253, the gas direction is essentially aligned with the axis of the rotating shaft 14, smoothly entering the axially arranged pressurization chamber 2503 and being drawn in by the impeller 15 housed within it. The impeller 15 transfers energy to the gas through high-speed rotation, achieving an increase in dynamic pressure and compression of the gas. Through the above structural design, the guide element 253 can guide the airflow entering from the intake duct 2501 in a radial or near-radial direction to gradually flow in an axial direction, ultimately smoothly entering the axially inlet impeller 15 in the pressurization chamber 2503. This effectively improves the airflow path, achieves a smooth transition in airflow direction, reduces turbulence and energy loss, and enhances the intake efficiency and aerodynamic performance of the compressor 1.

[0047] Understandably, attached Figure 1 In the diagram, arrow x represents the axial direction of the volute assembly 25, and arrow y represents the radial direction of the volute assembly 25.

[0048] It is understandable that when the first direction and the axial direction are located in the same plane and intersect each other (i.e., the first direction is parallel to the radial direction), the air collection chamber 2502 is located at the end of the extension direction of the air intake duct 2501, and the end opening of the air intake duct 2501 is completely overlapped and connected with the air collection chamber 2502. When the first direction and the axial direction are located in different planes and the first direction and the axial direction are spaced apart (i.e., the first direction and the radial direction form an angle of less than 90°), there is a spatial gap between the end opening of the air intake duct 2501 and the air collection chamber 2502, and part of the end opening of the air intake duct 2501 overlaps and connects with the air collection chamber 2502.

[0049] In some embodiments, to further optimize the airflow guiding path, the guide surface of the guide member 253 has a special contour structure. Specifically, the guide surface is composed of multiple arc segments connected sequentially from the first end to the second end, with smooth transitions between each arc segment, and the radii of any two adjacent arc segments are different from each other. The arrangement of multiple arc segments causes the overall outer diameter of the guide surface to gradually decrease along the axial direction, thereby forming a convergent spatial contour. Since each arc segment has a different curvature, the guide surface can achieve a geometric path that better conforms to the changes in airflow velocity and direction of change, effectively avoiding airflow separation or impact phenomena caused by a single curvature of the guide surface.

[0050] In a preferred embodiment, two adjacent arc segments can be connected tangentially or abuttedly. Tangential connection means that the two arc segments not only share a common point at the connection point but also have the same tangent direction, resulting in a smooth and continuous transition. Abutted connection means that the two curves only share a common point at the connection point, but their tangent directions are discontinuous, exhibiting abrupt angle changes or a broken line transition. Tangential connection makes the guide surface profile transition smoother, facilitating airflow adherence to the guide surface and preventing flow separation. Abutted connection simplifies the processing technology and facilitates manufacturing.

[0051] Furthermore, in some structures, adjacent arc segments can be connected by straight segments, allowing the guide surface to be composed of a combination of arc segments and straight segments. Therefore, the guide surface as a whole can be composed of multiple arc segments with different radii and one or more straight segments, which provides high design flexibility and allows for geometric adjustment according to the actual needs of airflow guidance.

[0052] In some embodiments, the volute assembly 25 includes a volute body 251 and an intake housing 252. An intake passage 2501 is formed on the volute body 251, and an air collection chamber 2502 is formed on the intake housing 252. A pressurization chamber 2503 is defined by the volute body 251 and the intake housing 252.

[0053] Specifically, the volute body 251 is the main structural support component in the volute assembly 25. An air intake duct 2501 extending radially is machined inside the volute body 251. The air inlet 25011 of the air intake duct 2501 connects to an external air source, and the air outlet of the air intake duct 2501 points towards the radial outer periphery of the air collection chamber 2502. The air collection chamber 2502 is formed inside the air intake housing 252. The air collection chamber 2502 is an annular cavity with an opening extending radially outward to align with the outlet of the air intake duct 2501. One axial end of the air collection chamber 2502 communicates with the pressurization chamber 2503. The air collection chamber 2502 cooperates with the guide member 253 to form a guide cavity with radial air intake and axial air outlet. The material of the air intake housing 252 matches that of the volute body 251 to ensure structural rigidity and aerodynamic performance. The pressurization chamber 2503 is formed by the mating surfaces of the volute body 251 and the air intake housing 252. Specifically, the pressurization chamber 2503 is an annular cavity formed by the axial inner wall of the volute body 251 and the axial inner wall of the intake housing 252. The central axis of the pressurization chamber 2503 is coaxial with the magnetic levitation rotor shaft and is used to accommodate the impeller 15. The outlet end of the pressurization chamber 2503 is connected to the subsequent flow channel of the volute body 251 to discharge the compressed gas.

[0054] The volute body 251 and the intake housing 252 are fastened together with bolts. A high-temperature resistant sealing gasket is installed between the mating surfaces of the volute body 251 and the intake housing 252 to prevent leakage of high-pressure gas in the pressurization chamber 2503. The mating axis of the volute body 251 and the intake housing 252 coincides with the axis of the rotor shaft to ensure the coaxiality of the pressurization chamber 2503 and the impeller 15, and to avoid aerodynamic imbalance when the impeller 15 rotates.

[0055] It should be noted that external gas enters radially into the intake duct 2501 on the volute body 251, where it undergoes initial acceleration. The gas entering the gas collecting chamber 2502, under the action of the guide member 253, converges radially inward while gradually turning axially. The rectified airflow enters the pressurization chamber 2503 axially, interacting with the high-speed rotating impeller 15 within the pressurization chamber 2503. The impeller 15 performs work on the gas through centrifugal force, increasing the gas pressure, and finally discharges from the outlet end of the pressurization chamber 2503 into the subsequent flow channel. The intake duct 2501 extends radially, and at least a portion of the intake duct 2501 overlaps radially with the gas collecting chamber 2502.

[0056] In this embodiment, the volute body 251 and the intake housing 252 are designed separately and can be manufactured using different processes, reducing the processing difficulty of the complex internal cavity. The volute body 251 and the intake housing 252 are connected by bolts and can be disassembled and replaced. If the air collection chamber 2502 or the intake duct 2501 is worn, there is no need to replace the entire volute assembly 25.

[0057] In some embodiments, such as Figure 2 and Figure 4 As shown, the gas collecting chamber 2502 and the pressurizing chamber 2503 have a connecting port 25021. The connecting port 25021 is circular or nearly circular, and its shape is adapted to the annular cross-section of the impeller 15 inlet. The centerline of the connecting port 25021 is defined as the first axis 25022, which is parallel to the axial direction and coincides with the axis of the rotating shaft 14, i.e., it extends axially. The diameter of the connecting port 25021 is larger than the inlet diameter of the impeller 15, ensuring that the airflow can completely cover the working area of ​​the impeller 15. The edge of the connecting port 25021 is rounded to reduce the local resistance coefficient when the airflow enters the pressurizing chamber 2503. The air intake duct 2501 is a straight pipe or a curved flow channel extending radially. The centerline of the air intake duct 2501 is defined as the second axis 25012, which extends radially and intersects with the first axis 25022. The second axis 25012 is perpendicular to the first circumferential direction, or it can be configured to form a non-perpendicular angle with the first axis 25022. When the second axis 25012 is perpendicular to the first circumferential direction at the intersection point, the intersection point of the second axis 25012 and the first axis 25022 is located radially inside the connecting port 25021. When the second axis 25012 forms an angle with the first axis 25022, the intersection point of the second axis 25012 and the first axis 25022 is located inside the air collection chamber 2502. An air inlet 25011 is provided at the end of the air intake duct 2501 that is away from the air collection chamber 2502.

[0058] In this embodiment, the second axis 25012 is arranged to intersect with the first axis 25022, so that when the airflow from the intake duct 2501 flows into the air collection chamber 2502, it is directly aligned with the center of the connecting port 25021. This facilitates the uniform flow of airflow through the connecting port 25021 into the interior of the air collection chamber 2502, avoiding the formation of a low-speed zone on one side of the connecting port 25021. This allows the airflow entering the air collection chamber 2502 through the connecting port 25021 to diffuse outwards from the center of the connecting port 25021, forming a radially symmetrical flow pattern, and flowing evenly towards the impeller 15, thereby improving the working efficiency of the impeller 15.

[0059] In some implementation methods, please refer to Figure 2 and Figure 4As shown, the volute assembly 25 also includes a flow divider 254. The flow divider 254 includes a first segment 2541 disposed in the intake duct 2501 and a second segment 2542 disposed in the air collection chamber 2502. The first segment 2541 and the second segment 2542 are joined together and both extend along the length direction of the second axis 25012. Understandably, when the intake housing 252 is installed on the volute body 251, the first segment 2541 and the second segment 2542 are aligned, and the overall length extension direction of the flow divider 254 coincides with the second axis 25012. Therefore, the extension line of the length direction of the flow divider 254 intersects the first axis 25022.

[0060] The first segment 2541 has a flow divider at the end opposite to the second segment 2542. The flow divider is streamlined and its thickness gradually increases along the airflow direction of the intake duct 2501. The function of the flow divider is to reduce the resistance of the airflow when it passes through the flow divider rib 254. The end of the second segment 2542 opposite to the first segment 2541 extends directly to the circumferential edge of the connecting port 25021.

[0061] In this embodiment, the flow divider 254 radially divides the internal space of the air inlet 2501 and the air collection chamber 2502 into two sub-flow channels, causing the airflow to be split into two parallel and symmetrical airflows upon entry. This restricts the lateral diffusion of the airflow, forces the turbulent airflow to flow along a preset path, reduces the generation of eddies, and avoids energy loss caused by eddies, effectively preventing aerodynamic efficiency loss. Specifically, the extension line of the flow divider 254 intersects the first axis 25022, and the guiding direction of the flow divider 254 points directly to the center of the connecting port 25021, which is equivalent to providing a smooth transition path for the airflow. After the airflow is split by the flow divider 254, the extension direction of the circumferential inner wall of the air collection chamber 2502 naturally adjusts the flow direction, reducing the vertical impact angle on the wall of the air collection chamber 2502 opposite to the air inlet 2501, reducing kinetic energy loss during the turning process, and allowing more airflow energy to be effectively converted into pressure energy to drive the impeller 15 to rotate.

[0062] like Figure 2 As shown, the gas flow direction in the inlet duct 2501 and the gas collecting chamber 2502 is as indicated by the arrow. The flow divider 254 ensures that the flow rate and velocity of each sub-channel are consistent by uniformly dividing the airflow, so that the airflow can evenly cover the inlet section of the impeller 15 when passing through the connecting port 25021. The blades of the impeller 15 are subjected to balanced forces, ensuring the efficient conversion of airflow energy by the impeller 15 and indirectly avoiding the loss of aerodynamic efficiency. In other embodiments, the flow divider 254 may be set only in the gas collecting chamber 2502 or only in the inlet duct 2501, which also has the above-mentioned flow dividing effect, and will not be described in detail here.

[0063] In some embodiments, please combine Figure 2 andFigure 4 As shown, the volute assembly 25 also includes at least one guide rib 256, which is disposed within the air collection chamber 2502. The guide rib 256 is located entirely in the front-middle part of the air collection chamber 2502 along the airflow direction. Specifically, the front-middle part of the air collection chamber 2502 along the airflow direction is the region of the air collection chamber 2502 between the first axis 25022 and the air intake duct 2501, extending along the second axis 25012. The purpose of placing the guide rib 256 entirely in the front-middle part of the air collection chamber 2502 along the airflow direction is to allow the airflow to be guided and further divided by the guide rib 256 after the flow divider rib 254 has divided the gas flow. This forms a relay-type flow guidance with the flow divider rib 254 pre-drawing and the guide rib 256 finely adjusting. That is, the flow divider rib 254 divides the airflow within the air intake duct 2501 and the air intake cavity, while the guide rib 256 completes the deflection within the air collection chamber 2502.

[0064] The guide rib 256 is located outside the connecting port 25021 around the first axis 25022. The guide rib 256 is inclined relative to the second axis 25012. The first end of the guide rib 256 extends to the circumferential edge of the connecting port 25021, and the second end of the guide rib 256 is located closer to the air inlet 25011 than the first end. That is, along the direction of the second axis 25012, the distance from the second end of the guide rib 256 to the air inlet 25011 is less than the distance from the first end of the guide rib 256 to the air inlet 25011.

[0065] As the airflow flows along the surface of the guide rib 256, the curvature of the guide rib 256 gradually changes, forcing the airflow direction to gradually transition from radial to axial. This causes the angle between the airflow direction angle and the first axis 25022 to decrease uniformly and approach the axial direction, ultimately completing the transformation of the radially flowing airflow into axial flow.

[0066] In this embodiment, when there are multiple guide ribs 256, the multiple guide ribs 256 are distributed in a ring around the first axis 25022, and the symmetrical center line of each rib passes through the first axis 25022, forming a radial structure centered on the first axis 25022, so as to ensure uniform circumferential guidance of airflow.

[0067] The guide rib 256 is integrally formed or welded to the inner wall of the intake housing 252.

[0068] In some embodiments, please combine Figure 2As shown, the guide ribs 256 are arranged in pairs, with each pair of guide ribs 256 symmetrically arranged about the second axis 25012. This ensures a symmetrical distribution of airflow guidance around the connecting port 25021 and within the air collection chamber 2502. When airflow enters the air collection chamber 2502 from the inlet duct 2501 through the connecting port 25021, the guide ribs 256 on both sides apply symmetrical guiding forces to the airflow, avoiding airflow deflection or local velocity differences caused by a single guide rib 256. This ensures that the airflow diffuses uniformly along the circumference within the air collection chamber 2502, reducing local eddies or turbulence caused by uneven airflow distribution.

[0069] In this embodiment, a pair of guide ribs 256 are provided in the gas collection chamber 2502, and two of the guide ribs 256 are located on both sides of the second axis 25012. In other embodiments, multiple pairs of guide ribs 256 may be provided, and the multiple pairs of guide ribs 256 are arranged sequentially at intervals along the circumference of the connecting port 25021.

[0070] Furthermore, the guide rib 256 has a first guide surface facing the air inlet 25011 and a second guide surface opposite to the first guide surface. The first guide surface is a concave curved surface, and the second guide surface is a convex curved surface, making the guide rib 256 have an overall arc-shaped plate structure. Specifically, compared with a straight or acute-angle structure, the arc-shaped plate structure can reduce the frictional resistance between the airflow and the surface of the guide rib 256. Moreover, the first guide surface is a concave curved surface, which allows the airflow to smoothly transition along the first guide surface of the guide rib 256 when it flows through it. Under the guidance of the first guide surface of the guide rib 256 (on the side near the connecting port 2502124023), the airflow gradually converges radially inward, reducing the generation of local turbulence and eddies, thereby reducing aerodynamic drag loss.

[0071] Furthermore, from the radially outer side to the radially inner side of the air intake chamber 2502, the thickness of the guide rib 256 first increases and then decreases, meaning the cross-section of the guide rib 256 has a typical airfoil structure. With this configuration, after the airflow enters the air intake chamber 2502 from the inlet 2501, the airflow first contacts the leading edge of the guide rib 256 (i.e., the end of the guide rib 256 radially away from the connecting opening 25021). The leading edge is thinner, resulting in a smaller airflow impact angle and lower energy loss. The increased thickness in the middle region of the guide rib 256 prevents the formation of vortices on its surface. The trailing edge of the guide rib 256 (i.e., the end of the guide rib 256 radially towards the connecting opening 25021) gradually thins, allowing the airflow to smoothly leave the surface of the guide rib 256, reducing pressure drag caused by tail vortices. Thus, while the guide rib 256 provides a guiding function, it also reduces the resistance of the airflow passing through it.

[0072] It should be noted that in this embodiment, a gap is provided between the end of the guide rib 256 that is radially away from the communication port 25021 and the circumferential inner wall of the air collection chamber 2502. This allows the airflow, after being diverted by the diverting rib 254, to change its flow direction and flow towards the communication port 25021 when it passes through the guide rib 256. The other part of the airflow flows towards the middle and rear part of the air collection chamber 2502 along the airflow direction through the gap. That is, in addition to its guiding function, the guide rib 256 also has a diversion function, causing the airflow diverted by the diverting rib 254 to be diverted again when it passes through the guide rib 256. This gives the guide rib 256 multiple functions and improves the compactness of the volute assembly 25's structural design.

[0073] Among them, the middle and rear part of the air collection chamber 2502 along the airflow direction, that is, along the extension direction of the second axis 25012, is located in the area of ​​the air collection chamber 2502 on the side of the first axis 25022 away from the air intake 2501.

[0074] Furthermore, please combine Figure 2 As shown, the inner wall of the air collection chamber 2502 is also provided with a guide surface 257. Alternatively, the guide surface 257 is essentially formed by a portion of the circumferential inner wall of the air collection chamber 2502. Along the extension direction of the second axis 25012, the guide surface 257 is located on the side of the first axis 25022 opposite to the air inlet 25011. The airflow that flows into the middle and rear part of the air collection chamber 2502 from the air gap after being diverted by the guide rib 256 continues to change its flow direction towards the connecting port 25021 under the guidance of the guide surface 257.

[0075] Specifically, along the direction from the air inlet 25011 to the connecting port 25021, the radial distance between the guide surface 257 and the circumferential edge of the connecting port 25021 gradually decreases. The radial distance refers to the distance between the guide surface 257 and the circumferential edge of the connecting port 25021 in a direction perpendicular to the first axis 25022. The direction from the air inlet 25011 to the connecting port 25021 is the main convergence direction of the airflow within the air collection chamber 2502. Therefore, the radial distance between the guide surface 257 and the edge of the connecting port 25021 continuously decreases from the side closer to the air inlet 25011 to the side closer to the connecting port 25021, forming a gradually narrowing channel that guides the airflow towards the connecting port 25021 from wide to narrow.

[0076] The guide surface 257 is an arc-shaped wall surface along the circumference of the air collection chamber 2502. The guide surface 257 has a front end and a rear end. The front end is closer to the air inlet 2501 than the rear end. The front end is smoothly connected to the inner wall surface of the front middle part of the air collection chamber 2502. The front end is smoothly connected to the inner wall surface of the front middle part, so that when the airflow enters the rear middle part of the air collection chamber 2502 from the front middle part, it can flow along the continuous curved surface, avoiding airflow impact caused by structural abrupt changes, ensuring the continuity of airflow from the initial path to the rear middle part, and reducing local energy loss.

[0077] The tail end extends to the circumferential edge of the connecting port 25021, ensuring complete connection between the termination position of the guide surface 257 and the inlet boundary of the connecting port 25021. When the airflow flows along the guide surface 257 to the tail end, it can directly enter the connecting port 25021, avoiding airflow diffusion caused by the distance between the guide surface 257 and the connecting port 25021. The tail end intersects with the second axis 25012; that is, the arcuate extension of the guide surface 257 ultimately points to the intersection of the second axis 25012 and the first axis 25022, which is also the center of the connecting port 25021. The airflow guided by the guide surface 257 is directed toward the center of the connecting port 25021, which allows the airflow to enter the connecting port 25021 in a radially symmetrical and axially consistent direction. This improves the uniformity of the airflow velocity within the connecting port 25021, and ensures that the airflow flowing into the pressurization chamber 2503 through the connecting port 25021 is delivered to the impeller 15 at a uniform velocity. This improves the stability of the impeller 15's operation and reduces the vibration and noise of the impeller 15.

[0078] In some embodiments, such as Figure 2 As shown, the guide surface 257 includes a first guide surface 2571 and a second guide surface 2572, which are symmetrically arranged about the second axis 25012. In this embodiment, the first guide surface 2571 and the second guide surface 2572 cooperate with two paired guide ribs 256. The airflow flowing into the middle and rear part from the air gap of the paired guide ribs 256 will naturally split into two streams, left and right. The first guide surface 2571 guides the left airflow, and the second guide surface 2572 guides the right airflow. The curvature of the two surfaces and the design of the first and last ends are completely symmetrical, ensuring that the flow path length, turning angle and pressure loss of the left and right airflows in the middle and rear part are completely consistent. The energy distribution when they finally converge at the connecting port 25021 is more balanced, reducing local eddies or pressure fluctuations caused by flow field asymmetry.

[0079] In some embodiments, the volute body 251 includes a main body and a volute portion. The main body serves as the main support structure of the volute body 251 and integrates the aforementioned air intake duct 2501. The volute portion is connected to the main body at one end along the axial direction. The volute portion has an annular structure, and its interior defines a volute chamber. The volute chamber is an annular flow channel surrounding the pressurization chamber 2503 and communicating with the exhaust end of the pressurization chamber 2503. The volute chamber is used to convert the high-speed airflow discharged from the pressurization chamber 2503 into pressure energy. The volute portion has an inner peripheral wall disposed around a first axis 25022, which encloses a receiving space. The air intake housing 252 is annular and located within the receiving space.

[0080] Understandably, the intake housing 252 is embedded within the receiving space of the volute, forming an axially nested structure. Compared to the traditional structure where the intake housing 252 and the volute body 251 are axially connected, this effectively reduces the axial length. This makes the volute assembly 25 more compact in the axial direction, thereby directly reducing the axial span of the shaft 14, which helps to increase the first-order bending mode frequency and enhance rotor stability.

[0081] Furthermore, such as Figure 3 and Figure 4 As shown, the outer peripheral wall and inner peripheral wall of the intake housing 252 are sealed together. The radial fit between the intake housing 252 and the volute portion forms a surface contact seal, which has a large contact area and can disperse the gas pressure on the sealing surface, avoiding seal failure caused by excessive local pressure. Specifically, the intake housing 252 and the inner peripheral wall can be sealed with O-rings. Utilizing the good elasticity of the O-rings, they will undergo elastic deformation under axial preload, filling the tiny imperfections on the sealing surface. Their temperature resistance range can adapt to the temperature fluctuations during the operation of the compressor 1, ensuring sealing stability under high pressure.

[0082] In some embodiments, such as Figure 1 and Figure 2 As shown, the volute body 251 is also provided with an exhaust duct 2504, which extends circumferentially along the volute chamber. One end of the exhaust duct 2504 is connected to the volute chamber, and the other end of the exhaust duct 2504 forms an exhaust port 25041. In detail, the volute chamber, as an annular space surrounding the pressurization chamber 2503, has gas that mainly flows circumferentially after being pressurized. When the exhaust duct 2504 extends circumferentially, it can conform to the flow direction of the gas in the volute chamber, so that the gas does not need to change its flow direction significantly when entering the exhaust duct 2504 from the volute chamber. This reduces eddies, impacts, and flow separation caused by sudden changes in flow direction, reduces local energy loss, and improves the continuity and smoothness of gas flow.

[0083] In some embodiments, the flow guide 253 is provided with a through hole 2531 for engaging with the rotating shaft 14. The through hole 2531 extends through the axial direction of the flow guide 253, and the rotating shaft 14 passes through the through hole 2531, thereby achieving a coaxial arrangement between the flow guide 253 and the rotating shaft 14. To prevent gas leakage while ensuring that the rotating shaft 14 can rotate freely, a sealing structure 2532 is provided on the circumferential inner wall of the through hole 2531. This sealing structure 2532 is used to form a rotational seal engagement with the circumferential outer wall of the rotating shaft 14, which not only ensures the freedom of movement of the rotating assembly but also improves the sealing performance inside the volute.

[0084] In a preferred embodiment, the sealing structure 2532 can be in the form of a comb seal or a labyrinth seal to adapt to the sealing and reliability requirements of different compressor 1 operating conditions. The sealing structure 2532 allows the guide vane 253 in the gas collecting chamber 2502 area adjacent to the impeller 15 to effectively isolate the gas leakage path between the high and low pressure areas, preventing gas from back-venting through the gap between the guide vane 253 and the rotating shaft 14, thus improving the sealing efficiency and overall aerodynamic performance of the compressor 1 system. Furthermore, since the guide vane 253 itself does not rotate with the rotating shaft 14, the sealing structure 2532 and the rotating shaft 14 form a non-fixed, rotating fit, achieving a low-leakage, low-wear dynamic sealing effect under long-term stable operation.

[0085] In some embodiments, to further improve the sealing performance between the guide member 253 and the rotating shaft 14, at least two coaxially arranged annular grooves 25321 are provided on the circumferential inner wall of the guide member 253 along the axial direction. Multiple annular grooves 25321 are arranged sequentially at intervals along the axial direction and are uniformly formed in the circumferential inner wall of the guide member 253. Due to the axial spacing between adjacent annular grooves 25321, multiple comb-like structures separated by the annular grooves 25321 are formed on the circumferential inner wall. The comb-like structures are annular bosses, uniformly arranged in a ring shape along the inner wall of the guide member 253.

[0086] In a preferred embodiment, the number of comb-like structures is 3 to 6. The depth and width of each annular groove 25321 are optimized according to the sealing requirements of the compressor 1, and the bottom of the groove is rounded to reduce stress concentration. Specifically, the depth of each annular sealing groove is preferably 2 mm to 20 mm, and the width is preferably 1 mm to 10 mm.

[0087] In some embodiments, the gas collection chamber 2502 is provided with an assembly port at one end axially away from the communication port 25021. The assembly port is circular and the inner circumferential surface of the assembly port is provided with a positioning stop for installing the positioning guide 253. The diameter of the assembly port is larger than the diameter of the communication port 25021.

[0088] Furthermore, the first end of the guide member 253 extends away from the air collection chamber 2502 to form a connecting portion 2535. Specifically, the connecting portion 2535 is an annular structure formed by the extension of the guide member 253, with its outer peripheral wall abutting against the inner peripheral wall of the air intake housing 252. Through this mating, the guide member and the air intake housing are positioned, connected, and sealed. This structural design allows the guide member 253 to be inserted axially into the assembly port of the air intake housing 252, and radial guidance and support are achieved through the contact between the outer and inner peripheral walls. Furthermore, the connecting portion 2535 can also serve as a positioning section during assembly, ensuring that the guide member 253 maintains an accurate position within the air intake housing 252, thereby improving the stability of the air intake flow and the overall sealing effect.

[0089] Understandably, a blind hole is provided on the end face of the connecting portion 2534 of the flow guide 253 away from the gas collecting chamber 2502. The blind hole is a structural hole that is open at only one end and closed at the bottom, located on the side of the connecting portion 2534 away from the gas collecting chamber 2502. The diameter and depth of the blind hole can be designed according to the connection requirements and are used for plug-in connection structures, such as locating pins, connecting pins, or bolts. Through the cooperation of this blind hole and the connection structure, an effective axial limiting or radial anti-rotation connection can be formed between the flow guide 253 and the protective bearing seat 13. Furthermore, this plug-in connection method has advantages such as convenient assembly, compact structure, and reliable positioning, and is particularly suitable for the internal structural design of compressors with limited space.

[0090] Understandably, there are multiple blind holes, spaced circumferentially along the through holes 2531 of the guide member 253. This arrangement enables the guide member 253 to achieve multi-point positioning during assembly, enhancing the connection stability and anti-rotation capability between it and the protective bearing housing 13, further improving the overall reliability and airflow guidance accuracy of the compressor 1.

[0091] In some embodiments, such as Figure 4 As shown, along the axial direction, the end of the guide member 253 facing away from the gas collection chamber 2502 is provided with a bearing mounting groove 2533, which is used to install and protect the bearing body 16. Along the radial direction, at least part of the bearing mounting groove 2533 overlaps with the gas collection chamber 2502.

[0092] It should be noted that in the existing solution, the bearing mounting position and the gas collecting chamber 2502 need to be arranged sequentially along the axial direction. The length of the axial space occupied by the bearing mounting position and the gas collecting chamber 2502 is at least the sum of their thicknesses. However, in this embodiment, the length of the axial space occupied can be reduced by radial overlap. The axial length of the protective bearing body 16 and the gas collecting chamber 2502 is shortened, which directly reduces the span of the rotor shaft, increases the first-order bending mode frequency, and reduces the risk of resonance.

[0093] Furthermore, the end of the flow guide 253 facing away from the gas collecting chamber 2502 is also provided with a bearing housing mounting groove 2534. Specifically, the bearing housing mounting groove 2534 is located on the distal end face of the flow guide 253 and surrounds the bearing housing 13 for mounting and protecting the bearing housing. The size of the bearing housing mounting groove matches the outer peripheral surface of part of the protective bearing housing 13, and a stable connection is formed between the flow guide 253 and the protective bearing housing 13 through the mating installation. Furthermore, the bearing housing mounting groove 2534 structurally provides radial limiting for the flow guide 253. That is, in the assembled state, the flow guide 253 abuts against the protective bearing housing 13 radially through the bearing housing mounting groove 2534, preventing the flow guide 253 from shaking or shifting in the radial direction, thereby improving the overall assembly accuracy and operational stability.

[0094] Furthermore, the bearing housing mounting groove 2534 is a stepped groove structure, which is recessed stepwise along the axial direction and has stepped surfaces with different diameters on the inner and outer sides. This stepped groove, through its stepped structure, mates with the outer diameter of a portion of the protective bearing housing 13, providing both radial limiting and axial positioning for the protective bearing housing 13 during insertion, thereby ensuring that the protective bearing housing 13 is stably embedded in the guide member 253. This stepped groove structure not only improves assembly accuracy but also helps reduce installation stress, preventing the guide member 253 from shifting or loosening during operation, thus enhancing the structural reliability and service life of the compressor 1.

[0095] Furthermore, the flow guide 253 simultaneously serves three functions: airflow guidance, assembly port closure, and bearing installation. Compared to the traditional flow guide 253's separate design with independent bearing housing, it effectively reduces the number of parts, lowers assembly errors, and makes the overall structure of the volute assembly 25 more compact.

[0096] like Figure 3 and Figure 4 As shown, this embodiment also proposes a compressor 1, in which a volute assembly 25 is mounted on the main structure of the compressor 1 and connected to the housing 11 of the compressor 1. Specifically, the compressor 1 includes a housing 11, a magnetic bearing seat 12 connected to the housing 11, and a protective bearing seat 13 connected to the magnetic bearing seat 12. The volute assembly 25 is connected to the housing 11 through its structural components to ensure the positioning stability of the intake system and the compression chamber. The guide member 253 is mounted on the protective bearing seat 13 by bolts or a mating connection.

[0097] Furthermore, the guide member 253 and the protective bearing housing 13 together form a mounting cavity between their connection areas, which is used to accommodate and position the protective bearing body 16. The protective bearing body 16 is disposed inside the mounting cavity. In a preferred embodiment, the mounting cavity is an annular cavity arranged along the axial direction of the rotating shaft 14, which is jointly enclosed by the axial extension of the guide member 253 and the positioning step of the protective bearing housing 13. The mounting cavity is provided with a positioning structure or limiting groove to achieve precise fixation of the protective bearing body 16.

[0098] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A volute assembly, characterized in that, The volute assembly has radial and axial dimensions, defining a compression chamber. The compression chamber includes an air inlet, an air collection chamber, and a pressurization chamber connected in sequence. The pressurization chamber extends along the axial direction and is used to accommodate an impeller. The air inlet extends along a first direction, which is either in the same plane as the axial direction and intersects with it, or the first direction is in a different plane from the axial direction and is spaced apart from it. The volute assembly further includes a flow guide, which is disposed in the gas collection chamber. One side of the flow guide facing the gas collection chamber is configured as a flow guide surface. Along the axial direction, the flow guide surface has a first end and a second end that are arranged oppositely. From the first end to the second end, the outer diameter of the flow guide surface gradually decreases. The first end is disposed away from the pressurization chamber compared to the second end. Along the axial direction, the end of the guide member opposite to the gas collection chamber is provided with a bearing mounting groove, which is used to install and protect the bearing. Along the radial direction, at least a portion of the bearing mounting groove overlaps with the gas collecting chamber; The guide member is provided with a through hole for cooperating with the rotating shaft. A sealing structure is provided on the circumferential inner wall of the through hole. The sealing structure is used for rotational sealing cooperation with the circumferential outer wall of the rotating shaft.

2. The volute assembly according to claim 1, characterized in that, From the first end to the second end, the guide surface includes a plurality of sequentially connected arc segments, and any two adjacent arc segments have different radii.

3. The volute assembly according to claim 2, characterized in that, The two adjacent arc segments are connected tangentially.

4. The volute assembly according to claim 2, characterized in that, At least one set of two adjacent arc segments are connected by a straight line segment.

5. The volute assembly according to claim 1, characterized in that, The end of the flow guide away from the gas collection chamber is also provided with a bearing housing mounting groove, which is arranged around the bearing mounting slot and is used to install and protect the bearing housing.

6. The volute assembly according to claim 5, characterized in that, The bearing housing mounting groove is a stepped groove, which is gradually recessed from the first end to the second end.

7. The volute assembly according to claim 1, characterized in that, The volute assembly includes a connected volute body and an intake housing, the volute body defining the intake passage, the intake housing defining the air collection chamber, and the volute and the intake housing together defining the pressurization chamber; One end of the air collecting chamber along the axial direction is connected to the pressurization chamber. The air inlet passage penetrates the inner wall of the air collecting chamber along the radial direction and extends along the radial direction. At least a portion of the air inlet passage overlaps with the air collecting chamber along the radial direction.

8. The volute assembly according to claim 7, characterized in that, The gas collecting chamber and the pressurizing chamber have a communication port. The air intake duct has an air inlet at one end that is radially away from the gas collecting chamber. The communication port has a first axis, and the air intake duct has a second axis. The first axis is parallel to the axial direction, and the first axis intersects the second axis.

9. The volute assembly according to claim 8, characterized in that, The volute assembly further includes a flow divider extending along the second axis, the flow divider being located within the compression chamber and positioned between the communication port and the air inlet.

10. The volute assembly according to claim 9, characterized in that, The volute assembly also includes an exhaust duct that extends circumferentially along the volute body. One end of the exhaust duct is connected to the pressurization chamber, and the other end of the exhaust duct forms an exhaust port.

11. The volute assembly according to claim 10, characterized in that, The volute assembly further includes at least one guide rib, which is disposed in the air collection chamber and located outside the communication port around the first axis. The guide rib is inclined relative to the second axis, and the first end of the guide rib extends to the circumferential edge of the communication port. Along the direction of the second axis, the distance from the second end of the guide rib to the air inlet is less than the distance from the first end of the guide rib to the air inlet.

12. The volute assembly according to claim 11, characterized in that, The guide ribs are arranged in pairs, and each pair of guide ribs is symmetrically arranged with the second axis as the axis of symmetry.

13. The volute assembly according to claim 12, characterized in that, The first end of the guide extends toward the direction away from the air collection chamber to form a connecting portion, and the outer peripheral wall of the connecting portion abuts against the inner peripheral wall of the air intake housing.

14. The volute assembly according to claim 13, characterized in that, A blind hole is provided on the end face of the connecting part away from the gas collecting chamber, and the blind hole is used for plugging in the connecting structure.

15. The volute assembly according to claim 1, characterized in that, Along the axial direction, the circumferential inner wall of the flow guide is provided with at least two coaxially arranged annular grooves, and all the annular grooves are arranged sequentially at intervals along the axial direction and are separated into multiple comb-tooth structures on the circumferential inner wall of the flow guide.

16. A compressor, characterized in that, It includes a housing, a magnetic bearing housing connected to the housing, and a protective bearing housing connected to the magnetic bearing housing; According to any one of claims 1 to 15, the volute assembly is connected to the housing, the guide member of the volute assembly is connected to the protective bearing seat, the guide member and the protective bearing seat together form an installation cavity, and the protective bearing is provided in the installation cavity.

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