Volute assembly and compressor

Abstract

The invention relates to the technical field of compressors, in particular to a volute assembly and a compressor, and the volute assembly has a radial direction and an axial direction and defines a compression cavity. The compression cavity sequentially comprises an air inlet channel, an air collecting chamber and a pressurizing chamber along an air flow path. The air inlet channel allows air to enter the volute assembly in the radial or nearly radial direction, and compactness of structural arrangement of the compressor is facilitated. A flow guide piece is arranged in the volute assembly and arranged in the gas collection chamber, and the side, facing the gas collection chamber, of the flow guide piece is configured to be a flow guide face. The flow guide face extends in the axial direction and is provided with a first end and a second end which are oppositely arranged, and the outer diameter of the flow guide face is gradually reduced in the direction from the first end to the second end. In the implementation mode, after gas enters the gas collecting chamber from the gas inlet channel in the radial direction or the partial radial direction, the gas can be guided by the flow guide face to be gradually deflected to flow in the axial direction, so that the gas smoothly enters the impeller arranged in the pressurizing chamber in the axial direction, and the consistency and stability of the gas inlet direction are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a volute assembly and a compressor. Background Art

[0002] Compressors, as key equipment for fluid transport and energy conversion, are widely used in a variety of fields, including HVAC, industrial refrigeration, and gas compression. To meet the requirements of compact structure and flexible layout, some compressors use radial air intake, meaning that air enters the compressor perpendicular to the axis of the rotor.

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

[0004] 1. The flow uniformity before the airflow enters the impeller is poor, which easily causes local deviation flow, resulting in uneven load in each working area of ​​the impeller;

[0005] 2. There is a large flow loss when the airflow changes direction, which reduces the air intake efficiency;

[0006] 3. Unstable inlet air flow field will cause the additional load on the impeller to increase, affecting the performance and service life of the compressor. Summary of the Invention

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

[0008] The present invention provides a volute assembly, the volute assembly having a radial direction and an axial direction, the volute assembly defining a compression chamber, the compression chamber including an air inlet duct, a gas collecting chamber, and a pressurized chamber that are sequentially connected, the pressurized chamber extending along the axial direction, the pressurized chamber being used to accommodate an impeller, the air inlet duct extending along a first direction, the first direction and the axial direction being located in the same plane and intersecting, or the first direction and the axial direction being located in different planes and spaced apart from each other;

[0009] The volute assembly also includes a guide member, which is arranged in the air collecting chamber. The side of the guide member facing the air collecting chamber is configured as a guide surface, and along the axial direction, the guide surface has a first end and a second end arranged oppositely. The outer diameter of the guide surface gradually decreases from the first end to the second end, and the first end is arranged away from the pressurized chamber compared to the second end.

[0010] According to the volute assembly of the present invention, the airflow path is guided by the compression chamber defined by the volute. The compression chamber sequentially comprises an inlet duct, a plenum chamber, and a pressurization chamber. Specifically, the airflow process is as follows: external air first enters the inlet duct, which extends in a first direction parallel to or at an angle less than 90° to the radial direction of the rotating shaft. This direction allows the air to be drawn into the volute in a radial or partially radial direction. The air then enters the pressurization chamber from the inlet duct, where its flow direction is adjusted before entering the impeller. The present invention provides a flow guide within the pressurization chamber. This flow guide has a guide surface on the side facing the pressurization chamber. The guide surface extends axially, has a larger outer diameter at the first end, and a smaller outer diameter at the second end, forming a converging guide cone structure. Guided by the guide surface, the airflow gradually shifts from a radial or partially radial direction to an axial direction, achieving a smooth transition in airflow direction. After being rectified by the flow guide, the air is now directed substantially in line with the axis of the rotating shaft, smoothly entering the axially arranged pressurization chamber and being drawn into the impeller contained therein. The impeller transfers energy to the gas through high-speed rotation, increasing its dynamic pressure and compressing it. Through this structural design, the guide member can guide the airflow entering the inlet duct in a radial or near-radial direction to gradually flow in an axial direction, ultimately smoothly entering the impeller in the pressurized chamber along the axial direction. 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, in a direction from the first end to the second end, the guide surface includes a plurality of arc segments connected in sequence, and the radii of two adjacent arc segments are different.

[0013] In some embodiments of the present invention, two adjacent arc segments are connected in a tangential manner.

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

[0015] In some embodiments of the present invention, along the axial direction, one end of the flow guide member away from the air collecting chamber is provided with a bearing mounting groove, and the bearing mounting groove is used to mount a protective bearing;

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

[0017] In some embodiments of the present invention, a bearing seat mounting groove is further provided at one end of the guide member facing away from the air collecting chamber. The bearing seat mounting groove is arranged around the bearing mounting groove, and the bearing seat mounting groove is used to install and protect the bearing seat.

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

[0019] In some embodiments of the present invention, the volute assembly includes a volute body and an air inlet housing connected to each other, the volute body defines the air inlet passage, the air inlet housing defines the air collecting chamber, and the volute and the air inlet housing together define the pressurized chamber;

[0020] One end of the air collecting chamber along the axial direction is communicated with the pressurized chamber, the air inlet duct passes through the inner wall of the air collecting chamber along the radial direction, the air inlet duct extends along the radial direction, and at least a portion of the air inlet duct overlaps with the air collecting chamber along the radial direction.

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

[0022] In some embodiments of the present invention, the volute assembly further includes a diverter rib extending along the second axis, wherein the diverter rib is located in the compression chamber and is provided between the communication port and the air inlet.

[0023] In some embodiments of the present invention, the volute assembly further includes an exhaust duct, which extends along the circumference of the volute body, one end of the exhaust duct is connected to the pressurized chamber, and the other end of the exhaust duct is formed with an exhaust port.

[0024] In some embodiments of the present invention, the volute assembly further includes at least one guide rib, which is disposed in the air collecting chamber and outside the connecting 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 connecting port. Along the direction of the second axis, the distance from the second end of the guide rib to the air inlet is smaller 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 the guide ribs are symmetrically arranged with the second axis as a symmetry axis.

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

[0027] In some embodiments of the present invention, a blind hole is provided on the end surface of the connecting portion facing 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 the rotating shaft, and a sealing structure is provided on the circumferential inner wall of the through hole, and the sealing structure is used for rotating and 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 guide member is provided with at least two coaxially arranged annular grooves, and all of the annular grooves are sequentially spaced along the axial direction and separate a plurality of comb-tooth structures on the circumferential inner wall of the guide member.

[0030] The present invention also provides a compressor, comprising a casing, a magnetic bearing seat connected to the casing, and a protective bearing seat connected to the magnetic bearing seat;

[0031] The above-mentioned volute assembly is connected to the machine casing, the flow guide of the volute assembly is connected to the protective bearing seat, the flow guide and the protective bearing seat are combined to form an installation cavity, and a protective bearing is provided in the installation cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0033] Figure 1 Schematically shows a structural diagram of a volute assembly according to an embodiment of the present invention;

[0034] Figure 2 The cross-sectional structure diagram of the volute assembly along the radial direction according to the embodiment of the present invention is schematically shown;

[0035] Figure 3 Schematically shows a cross-sectional structural diagram of a volute assembly according to an embodiment of the present invention;

[0036] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0037] The reference numerals are as follows:

[0038] 25. Volute assembly; 2501. Inlet duct; 25011. Inlet port; 25012. Second axis; 2502. Gas collecting chamber; 25021. Communication port; 25022. First axis; 2503. Pressurized chamber; 2504. Exhaust duct; 25041. Exhaust port; 251. Volute body; 252. Inlet housing; 253. Flow guide; 2531. Through hole; 2532. Sealing structure; 25321. Annular groove; 2533. Bearing mounting groove; 2534. Bearing seat mounting groove; 2535. Connecting portion; 254. Diverter rib; 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. Casing; 12. Magnetic bearing seat; 13. Protective bearing seat; 14. Rotating shaft; 15. Impeller; 16. Protective bearing body. DETAILED DESCRIPTION

[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0042] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0043] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped over, an element described as "below" or "beneath" another element or feature would then be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations.

[0044] like Figures 1 to 4 As shown, this embodiment provides a volute assembly 25 having both radial and axial directions and defining a compression chamber. The compression chamber includes, along the airflow path, an inlet duct 2501, a plenum 2502, and a pressurized chamber 2503. The pressurized chamber 2503 is used to accommodate the impeller 15. When gas enters the compression chamber, it first passes through the inlet duct 2501, then enters the plenum 2502, and finally enters the pressurized chamber 2503 to be compressed by the impeller 15. The inlet duct 2501 extends along a first direction, with the first direction and the axial direction lying in the same plane and intersecting (i.e., the first direction is parallel to the radial direction), or lying in different planes and spaced apart from the axial direction (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 in a radial or near-radial direction, facilitating the compactness of the compressor 1. The pressurized chamber 2503 is arranged axially to accommodate the impeller 15, which takes in air axially.

[0045] In order to optimize the flow path of the airflow from the air inlet 2501 to the impeller 15, a guide member 253 is provided in the volute assembly 25. The guide member 253 is provided in the air collecting chamber 2502, and its side facing the air collecting chamber 2502 is configured as a guide surface. The guide surface extends in the axial direction and has a first end and a second end arranged opposite to each other, wherein the outer diameter of the guide surface gradually decreases from the first end toward the second end, forming a conical or convergent guide structure. In this embodiment, the first end is closer to the air inlet 2501 than the second end, away from the pressurized chamber 2503, and the second end is arranged toward the pressurized chamber 2503. Through the above structural design, when the gas enters the air collecting chamber 2502 from the air inlet 2501 in a radial or eccentric radial direction, it can be gradually deflected to flow in an axial direction under the guidance of the guide surface, thereby smoothly entering the impeller 15 arranged axially in the pressurized chamber 2503, thereby improving the consistency and stability of the air intake direction. The setting of the guide member 253 enables the airflow to form a continuous and smooth transition path before entering the impeller 15 from the air inlet 25011, avoiding the problems of turbulence, energy loss and decreased aerodynamic efficiency caused by sudden changes in direction in traditional structures, and improving the overall compression performance.

[0046] According to the volute assembly 25 of this embodiment, the flow path of the airflow is guided by the compression chamber defined by the volute, and the compression chamber includes an air inlet 2501, an air collecting chamber 2502 and a pressurized chamber 2503 in sequence. The specific flow process is that the external gas first enters the air inlet 2501, and the air inlet 2501 extends along a first direction. The first direction is parallel to the radial direction of the rotating shaft 14 or forms an angle less than 90°, so the gas is introduced into the interior of the volute in a radial or eccentric radial direction. Then, the gas enters the air collecting chamber 2502 from the air inlet 2501, and the flow direction is adjusted in the air collecting chamber 2502 before entering the impeller 15. The present invention provides a guide member 253 in the air collecting chamber 2502, and the guide member 253 is provided with a guide surface facing the side of the air collecting chamber 2502. The guide surface extends axially, and its first end has a large outer diameter and a second end has a small outer diameter, forming a convergent guide cone structure. Under the guidance of the guide surface, the airflow gradually turns from the radial or eccentric radial direction to the axial direction, thereby completing a smooth transition of the airflow direction. The direction of the gas rectified by the guide member 253 is basically consistent with the axis of the rotating shaft 14, and smoothly enters the axially arranged pressurized chamber 2503 and is sucked into the impeller 15 contained therein. The impeller 15 transfers energy to the gas through high-speed rotation, thereby increasing and compressing the dynamic pressure of the gas. Through the above-mentioned structural design, the guide member 253 can guide the airflow entering from the air inlet 2501 in a radial or near-radial direction to gradually flow in the axial direction, and finally smoothly enter the impeller 15 in the axial air intake in the pressurized chamber 2503, thereby effectively improving the airflow path, achieving a smooth transition of the airflow direction, reducing turbulence and energy loss, and improving the air intake efficiency and aerodynamic performance of the compressor 1.

[0047] It can be understood that, in the Figure 1 In the figure, the arrow x is the axial direction of the volute assembly 25, and the arrow y is the radial direction of the volute assembly 25.

[0048] It can be understood that, when the first direction is in the same plane as the axial direction and is arranged to intersect (i.e., the first direction is arranged to be parallel to the radial direction), the plenum 2502 is located at the end of the extension direction of the intake passage 2501, and the end opening of the intake passage 2501 is completely coincident with and penetrates through the plenum 2502. When the first direction is in a different plane from the axial direction and the first direction is arranged to be spaced apart from the axial direction (i.e., the first direction forms an angle of less than 90° with the radial direction), there is a space interval between the end opening of the intake passage 2501 and the plenum 2502, and part of the end opening of the intake passage 2501 is coincident with and penetrates through the plenum 2502.

[0049] In some embodiments, in order to further optimize the air flow guiding path, the flow guide surface of the flow guide piece 253 has a special profile structure. Specifically, the flow guide surface is composed of a plurality of circular arc segments connected in sequence in the direction from the first end to the second end, the transitions between the circular arc segments are smooth, and the radii of any two adjacent circular arc segments are different from each other. The arrangement of the plurality of circular arc segments causes the overall outer diameter of the flow guide surface to gradually decrease along the axial direction, thereby forming a converging spatial profile. Since each circular arc segment has a different curvature, the flow guide surface can achieve a geometric path that is more in line with the air flow speed variation and direction turning law according to the requirements of fluid dynamics design, effectively avoiding air flow separation or impact phenomena caused by a single curvature of the flow guide surface.

[0050] In a preferred embodiment, the two adjacent circular arc segments can be arranged in a tangent connection or an abutment connection. Tangent connection means that the two circular arc segments have not only a common point at the connection but also the same tangent direction, and the transition is continuous and smooth. Abutment connection means that the two curve segments have only a common point at the connection, but the tangent direction is discontinuous, and there is an angle mutation or a line transition. Tangent connection makes the profile transition of the flow guide surface smoother, which is beneficial to the air flow adhering to the surface of the flow guide surface and avoiding flow separation, while abutment connection can simplify the processing technology and facilitate manufacturing.

[0051] In addition, in some structures, the adjacent circular arc segments can also be connected by a straight line segment, so that the flow guide surface is composed of circular arc segments and straight line segments. Therefore, the flow guide surface as a whole can be composed of a plurality of circular arc segments with different radii and one or more straight line segments as needed, and has high design flexibility, which can adjust the geometric shape according to the actual needs of air flow guiding.

[0052] In some embodiments, the volute assembly 25 includes a volute body 251 and an air intake shell 252 , the volute body 251 is formed with an air intake duct 2501 , the air intake shell 252 is formed with an air collecting chamber 2502 , and the volute body 251 and the air intake shell 252 jointly define a pressurized chamber 2503 .

[0053] Specifically, the volute body 251 is the main structural support member in the volute assembly 25. The volute body 251 is internally processed to form an air inlet duct 2501 extending radially. The air inlet 2501 is connected to the external air source through an air inlet port 2501. The air outlet of the air inlet duct 2501 points to the radial outer periphery of the air collecting chamber 2502. The air collecting chamber 2502 is formed inside the air inlet shell 252. The air collecting chamber 2502 is an annular cavity. The radial outer periphery is provided with an opening that docks with the outlet of the air inlet duct 2501. One axial end of the air collecting chamber 2502 is connected to the pressurized chamber 2503. The air collecting chamber 2502 cooperates with the guide member 253 to form a guide cavity with radial air inlet and axial air outlet. The material of the air inlet shell 252 matches the volute body 251 to ensure structural rigidity and aerodynamic performance. The pressurized chamber 2503 is formed by the docking surface of the volute body 251 and the air inlet shell 252. Specifically, the pressurized chamber 2503 is an annular cavity formed by the axial inner wall of the volute body 251 and the axial inner wall of the air inlet housing 252. The central axis of the pressurized chamber 2503 is coaxial with the magnetic levitation rotor axis and is used to accommodate the impeller 15. The outlet end of the pressurized chamber 2503 is connected to the subsequent flow passage 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 gasket is installed between the mating surfaces of the volute body 251 and the intake housing 252 to prevent leakage of high-pressure gas within the pressurized chamber 2503. The axis of the mating between the volute body 251 and the intake housing 252 coincides with the axis of the rotor shaft, ensuring coaxiality between the pressurized chamber 2503 and the impeller 15 and preventing aerodynamic imbalance during the rotation of the impeller 15.

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

[0056] In this embodiment, the volute body 251 and the intake shell 252 are designed in a split type, which can be manufactured by different processes respectively, thereby reducing the processing difficulty of the complex cavity. The volute body 251 and the intake shell 252 are connected by bolts and can be disassembled and replaced. If the plenum 2502 or the intake passage 2501 is worn, the volute assembly 25 does not need to be replaced as a whole.

[0057] In some embodiments, as shown in Figure 2 and Figure 4 The plenum 2502 and the pressurizing chamber 2503 have a communication port 25021. The communication port 25021 is circular or approximately circular, the shape of the communication port 25021 is adapted to the annular cross section of the inlet of the impeller 15, the center line of the communication port 25021 is defined as a first axis 25022, the first axis 25022 is parallel to the axial direction, and the first axis 25022 coincides with the axis of the rotating shaft 14, that is, extends along the axial direction. The diameter of the communication port 25021 is greater than the inlet diameter of the impeller 15, which ensures that the gas flow can completely cover the working area of the impeller 15. The edge of the communication port 25021 adopts a fillet transition to reduce the local resistance coefficient when the gas flow enters the pressurizing chamber 2503. The intake passage 2501 is a straight pipe or a curved flow passage extending in the radial direction. The center line of the intake passage 2501 is defined as a second axis 25012, the second axis 25012 extends in the radial direction, the second axis 25012 intersects the first axis 25022, and the second axis 25012 is perpendicular to the first circumferential direction. The second axis 25012 can also be arranged at an 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 communication port 25021. When the second axis 25012 is at an angle with the first axis 25022, the intersection point of the second axis 25012 and the first axis 25022 is located inside the plenum 2502. The end of the intake passage 2501 away from the plenum 2502 is provided with an air inlet 25011.

[0058] In this embodiment, the second axis 25012 intersects the first axis 25022, so that when the gas flow of the intake passage 2501 flows into the plenum 2502, it directly aligns the center of the communication port 25021, which is beneficial to the gas flow to pass through the communication port 25021 into the interior of the plenum 2502 uniformly, avoids the formation of a low-speed area on one side of the communication port 25021, and enables the gas flow passing through the communication port 25021 into the plenum 2502 to diffuse from the center of the communication port 25021 to all directions, forming a radially symmetric flow pattern and flowing uniformly to the impeller 15, thereby improving the working efficiency of the impeller 15.

[0059] In some embodiments, please refer to Figure 2 and Figure 4As shown, the volute assembly 25 further includes a diverter rib 254, which includes a first segment 2541 disposed in the air inlet duct 2501 and a second segment 2542 disposed in the plenum chamber 2502. The first segment 2541 and the second segment 2542 are abutted against each other and both extend along the length direction of the second axis 25012. It is understood that when the air inlet housing 252 is mounted on the volute body 251, the first segment 2541 and the second segment 2542 are aligned, and the overall length extension direction of the diverter rib 254 coincides with the second axis 25012. Therefore, the extension line of the length direction of the diverter rib 254 intersects the first axis 25022.

[0060] The end of the first segment 2541 facing away from the second segment 2542 is provided with a diverter. The diverter is generally streamlined and gradually increases in thickness along the direction of airflow in the air inlet duct 2501. The function of the diverter is to reduce the resistance of airflow passing through the diverter rib 254. The end of the second segment 2542 facing away from the first segment 2541 extends directly to the circumferential edge of the communication port 25021.

[0061] In this embodiment, the diverter rib 254 radially divides the internal space of the inlet duct 2501 and the plenum chamber 2502 into two sub-flow channels, so that the airflow is diverted into two parallel and symmetrical airflows upon entry, limiting the lateral diffusion of the airflow, forcing the turbulent airflow to flow along a preset path, reducing the generation of vortices, avoiding energy loss caused by vortices, and effectively avoiding the loss of aerodynamic efficiency. Specifically, the extension line of the diverter rib 254 intersects with the first axis 25022, and the guiding direction of the diverter rib 254 directly points to the center of the connecting port 25021, which is equivalent to providing a smooth transition path for the airflow. After the airflow is diverted by the diverter rib 254, the extension direction of the circumferential inner wall of the plenum chamber 2502 naturally adjusts the flow direction, reducing the vertical impact angle on the wall of the plenum chamber 2502 opposite to the inlet duct 2501, reducing the kinetic energy loss during the turning process, and allowing more airflow energy to be effectively converted into pressure energy that drives the impeller 15 to rotate.

[0062] like Figure 2 As shown, the direction of gas flow within the inlet duct 2501 and the plenum chamber 2502 is the direction indicated by the arrows. The diverter ribs 254 evenly divide the airflow, ensuring that the flow rate and velocity of each sub-flow channel are consistent. This allows the airflow to evenly cover the inlet cross-section of the impeller 15 when passing through the connecting opening 25021. The force on each blade of the impeller 15 is balanced, ensuring that the impeller 15 efficiently converts the airflow energy, indirectly avoiding the loss of aerodynamic efficiency. In other embodiments, the diverter ribs 254 can be provided only within the plenum chamber 2502, or only within the inlet duct 2501, and the same diversion effect is achieved. This will not be repeated here.

[0063] In some embodiments, please combine Figure 2 and Figure 4 As shown, the volute assembly 25 also includes at least one guide rib 256, which is disposed within the plenum chamber 2502 and is located entirely in the middle-front portion of the plenum chamber 2502 along the airflow direction. The middle-front portion of the plenum chamber 2502 along the airflow direction is the region of the plenum chamber 2502 extending along the second axis 25012, between the first axis 25022 and the inlet duct 2501. The purpose of placing the guide rib 256 entirely in the middle-front portion of the plenum chamber 2502 along the airflow direction is to allow the flow to be diverted and re-diverted by the guide rib 256 after the diverter rib 254 diverts the gas, creating a relay-type diversion process where the diverter rib 254 pre-introduces and the guide rib 256 fine-tunes the flow. Specifically, the diverter rib 254 divides the airflow within the inlet duct 2501 and the intake cavity, while the guide rib 256 redirects the airflow within the plenum chamber 2502.

[0064] The guide rib 256 is positioned outside the communication opening 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 communication opening 25021, and the second end of the guide rib 256 is positioned 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 shorter than the distance from the first end of the guide rib 256 to the air inlet 25011.

[0065] When the airflow flows along the surface of the guide rib 256, the curvature of the guide rib 256 gradually changes, forcing the flow direction of the airflow to gradually transition from radial to axial, so that the angle between the direction angle of the airflow and the first axis 25022 is uniformly reduced and close to the axial direction, and finally the radial flow of the airflow is transformed into axial flow.

[0066] In this embodiment, when there are multiple guide ribs 256, the multiple guide ribs 256 are distributed in a ring shape around the first axis 25022, and the symmetrical center lines of each rib pass through the first axis 25022, forming a radial structure with the first axis 25022 as the center, ensuring uniform circumferential guidance of the airflow.

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

[0068] In some embodiments, please combine Figure 2As shown, the guide vanes 256 are arranged in pairs, and each pair of guide vanes 256 is symmetrically arranged about the second axis 25012 as a symmetry axis, so that the gas flow guiding action of the periphery of the communication port 25021 and the gas chamber 2502 is symmetrically distributed. When the gas flow enters the gas chamber 2502 from the gas inlet 2501 through the communication port 25021, the guide vanes 256 on both sides can exert a symmetric guiding force on the gas flow, avoiding the gas flow deviation or local flow rate difference caused by the guide vanes 256 on one side, ensuring that the gas flow is uniformly diffused in the circumferential direction in the gas chamber 2502, and reducing the local vortex or turbulent flow caused by uneven gas flow distribution.

[0069] In this embodiment, the gas chamber 2502 is provided with a pair of guide vanes 256, and the two guide vanes 256 in the pair of guide vanes 256 are respectively located on both sides of the second axis 25012. In other embodiments, a plurality of pairs of guide vanes 256 can also be arranged, and the plurality of pairs of guide vanes 256 are sequentially and spaced apart along the circumferential direction of the communication port 25021.

[0070] Further, the guide vane 256 has a first guide surface facing the gas 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, so that the guide vane 256 has an overall arc-shaped plate structure. Specifically, compared with a flat or sharp structure, the arc-shaped plate structure can reduce the frictional resistance of the gas flow to the surface of the guide vane 256. Moreover, the first guide surface is a concave curved surface, so that when the gas flow passes through the guide vane 256, it can smoothly transition along the first guide surface of the guide vane 256, and under the guiding action of the first guide surface of the guide vane 256 (on the side close to the communication port 2502124023), the gas flow gradually converges to the radial inside, reducing the generation of local turbulent flow and vortex, thereby reducing the aerodynamic resistance loss.

[0071] Further, from the radial outside to the radial inside of the gas chamber 2502, the thickness dimension of the guide vane 256 first increases and then decreases, that is, the cross section of the guide vane 256 has a typical airfoil structure. In this way, after the gas flow from the gas inlet 2501 flows into the gas chamber 2502, the gas flow first contacts the leading edge of the guide vane 256 (i.e. the end of the guide vane 256 away from the communication port 25021 in the radial direction), the thickness of the leading edge is thin, the impact angle of the gas flow is small, and the energy loss is low. The thickness of the middle region of the guide vane 256 increases, which can avoid the formation of vortex on the surface of the guide vane 256, and the trailing edge of the guide vane 256 (i.e. the end of the guide vane 256 towards the communication port 25021 in the radial direction) gradually thins, so that the gas flow can smoothly leave the surface of the guide vane 256, reducing the pressure difference resistance caused by the tail vortex, thereby reducing the resistance of the gas flow passing through the guide vane 256 while the guide vane 256 has the gas flow guiding function.

[0072] It should be noted that in this embodiment, a wind gap is provided between the end of the guide rib 256 radially facing away from the communication opening 25021 and the circumferential inner wall of the plenum chamber 2502. This allows the airflow diverted by the diverter rib 254 to, when flowing through the guide rib 256, have a portion of the airflow redirected by the diverter rib 256 toward the communication opening 25021, while the remaining portion of the airflow passes through the wind gap and flows toward the middle and rear portion of the plenum chamber 2502 along the airflow direction. In other words, in addition to its guiding function, the guide rib 256 also has a diverting function, causing the airflow diverted by the diverter rib 254 to be diverted again when passing through the guide rib 256. This allows the guide rib 256 to simultaneously perform multiple functions, thereby improving the compactness of the volute assembly 25 structural design.

[0073] The middle and rear portion of the air collecting chamber 2502 along the air flow direction, i.e., along the extension direction of the second axis 25012 , is located in the area of ​​the air collecting chamber 2502 on the side of the first axis 25022 away from the air inlet duct 2501 .

[0074] Furthermore, please combine Figure 2 As shown, the inner wall of plenum chamber 2502 is further provided with a guide surface 257, or the guide surface 257 is substantially formed by a portion of the circumferential inner wall of plenum chamber 2502. Along the extension direction of second axis 25012, guide surface 257 is located on the side of first axis 25022 facing away from air inlet 25011. After being diverted by guide ribs 256, the airflow flowing into the middle and rear portion of plenum chamber 2502 through the air gap continues to change direction under the guidance of guide surface 257 and flows toward communication opening 25021.

[0075] Specifically, the radial spacing between the guide surface 257 and the circumferential edge of the connecting opening 25021 gradually decreases along the direction from the air inlet 25011 to the connecting opening 25021. The radial spacing refers to the distance between the guide surface 257 and the circumferential edge of the connecting opening 25021 in a direction perpendicular to the first axis 25022. The direction from the air inlet 25011 to the connecting opening 25021 represents the mainstream convergence direction of the airflow within the plenum 2502. Therefore, the radial distance between the guide surface 257 and the edge of the connecting opening 25021 decreases from the side closest to the air inlet 25011 to the side closest to the connecting opening 25021, forming a tapered channel that guides the airflow from wide to narrow and converges toward the connecting opening 25021.

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

[0077] The tail end extends to the circumferential edge of the communication port 25021, so that the terminal position of the guide surface 257 is completely connected with the inlet boundary of the communication port 25021. When the airflow flows along the guide surface 257 to the tail end, it can directly enter the communication port 25021, avoiding the airflow diffusion caused by the distance between the guide surface 257 and the communication port 25021. The tail end intersects the second axis 25012, that is, the arc-shaped 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 communication port 25021. The direction of the airflow guided by the guide surface 257 is gathered toward the center of the connecting port 25021, so that the airflow can enter the connecting port 25021 in a radially symmetrical and axially consistent direction, thereby improving the uniformity of the flow rate of the airflow in the connecting port 25021, and allowing the airflow flowing into the pressurized chamber 2503 through the connecting port 25021 to be delivered to the impeller 15 at a uniform flow rate, thereby improving the working stability of the impeller 15 and reducing the vibration and noise of the impeller 15.

[0078] In some embodiments, 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 respectively cooperate with the two paired guide ribs 256. The airflow flowing into the middle and rear portion through the airflow gap between the paired guide ribs 256 is naturally divided into two left and right streams. The first guide surface 2571 guides the left airflow, and the second guide surface 2572 guides the right airflow. The arc curvature, leading end, and tail end of the two guide surfaces are completely symmetrical, ensuring that the flow path lengths, turning angles, and pressure losses of the left and right airflows in the middle and rear portion are completely consistent. This ensures that the energy distribution of the airflows is more balanced when they finally converge at the connecting port 25021, reducing local vortices or pressure fluctuations caused by flow field asymmetry.

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

[0080] As can be understood, the air intake housing 252 is embedded within the accommodating space of the volute portion, forming an axially nested structure. Compared to a conventional structure in which the air intake housing 252 and the volute body 251 are axially connected in series, 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 rotating shaft 14, helping to increase the first-order bending modal frequency and enhance rotor stability.

[0081] Furthermore, if Figure 3 and Figure 4 As shown, the outer circumferential wall of the intake housing 252 is sealed to the inner circumferential wall. The radial fit between the intake housing 252 and the volute portion forms a surface-contact seal with a large contact area, which can disperse the gas pressure on the sealing surface and avoid seal failure caused by excessive local pressure. Specifically, the intake housing 252 and the inner circumferential wall can be sealed with an O-ring. The O-ring has good elasticity and will elastically deform under the action of axial preload, filling minor imperfections on the sealing surface. Its 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, as Figure 1 and Figure 2 As shown, the volute body 251 is further provided with an exhaust duct 2504, which extends along the circumference of 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 is formed with an exhaust port 25041. In detail, the volute chamber is an annular space arranged outside the pressurized chamber 2503. The pressurized gas therein mainly flows along the circumferential direction. When the exhaust duct 2504 extends along the circumferential direction, it can conform to the flow direction of the gas in the volute chamber. When the gas enters the exhaust duct 2504 from the volute chamber, there is no need to significantly change the flow direction. This reduces eddies, impacts, and flow separation caused by sudden changes in flow direction, reduces local energy losses, 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 mating with the rotating shaft 14. The through hole 2531 extends axially through the flow guide 253, and the rotating shaft 14 is disposed within the through hole 2531, thereby achieving a coaxial arrangement between the flow guide 253 and the rotating shaft 14. To prevent gas leakage and ensure the free rotation of the rotating shaft 14, a sealing structure 2532 is provided on the circumferential inner wall of the through hole 2531. This sealing structure 2532 forms a rotational seal with the circumferential outer wall of the rotating shaft 14, ensuring the freedom of movement of the rotating assembly while improving the sealing performance within 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 setting of the sealing structure 2532 enables the guide member 253 to effectively block the gas leakage path between the high and low pressure areas in the gas collecting chamber 2502 area adjacent to the impeller 15, avoiding the reverse pressure release of gas from the gap between the guide member 253 and the rotating shaft 14, thereby improving the sealing efficiency and overall aerodynamic performance of the compressor 1 system. In addition, since the guide member 253 body does not rotate with the rotating shaft 14, the sealing structure 2532 and the rotating shaft 14 form a non-fixed, rotating matching relationship, which can achieve a low-leakage, low-wear dynamic sealing effect under long-term stable operation.

[0085] In some embodiments, to further enhance the sealing performance between the flow guide 253 and the rotating shaft 14, at least two coaxially arranged annular grooves 25321 are provided along the axial direction of the circumferential inner wall of the flow guide 253. The multiple annular grooves 25321 are spaced apart in sequence along the axial direction and are evenly distributed along the circumferential inner wall of the flow guide 253. Due to the axial spacing between adjacent annular grooves 25321, a plurality of comb-tooth structures are formed on the circumferential inner wall, separated by the annular grooves 25321. The comb-tooth structures are annular bosses and are evenly arranged in a ring shape along the inner wall of the flow guide 253.

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

[0087] In some embodiments, an assembly port is provided at one end of the air collecting chamber 2502 axially away from the connecting port 25021. The assembly port is a circular opening, and the inner circumference of the assembly port is provided with a positioning stop for installing the positioning guide member 253. The diameter of the assembly port is larger than the diameter of the connecting port 25021.

[0088] Furthermore, the first end of the guide member 253 extends away from the air collecting 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, whose outer peripheral wall abuts the inner peripheral wall of the air intake housing 252, and through this cooperation, a positioning connection and sealing between the guide member and the air intake housing are achieved. This structural design allows the guide member 253 to be axially inserted into the assembly opening of the air intake housing 252, and radial guidance and support are achieved through the contact between the outer peripheral wall and the inner peripheral wall. Furthermore, the connecting portion 2535 can also serve as a positioning section during assembly, ensuring that the guide member 253 maintains a precise position within the air intake housing 252, thereby improving the stability of the intake guide and the overall sealing effect.

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

[0090] It is understood that there are multiple blind holes, which are spaced apart along the circumference of the through hole 2531 of the flow guide 253. This arrangement enables the flow guide 253 to achieve multi-point positioning connection during assembly, thereby enhancing the connection stability and anti-rotation capability between the flow guide 253 and the protective bearing seat 13, further improving the overall reliability and airflow guidance accuracy of the compressor 1.

[0091] In some embodiments, as Figure 4 As shown, along the axial direction, a bearing mounting groove 2533 is provided at one end of the guide member 253 away from the air collecting chamber 2502 . The bearing mounting groove 2533 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 air collecting chamber 2502 .

[0092] It should be noted that, in the existing solution, the bearing mounting position and the air collecting chamber 2502 need to be arranged in sequence along the axial direction, and the length of the axial space occupied by the bearing mounting position and the air collecting chamber 2502 is at least the sum of their thicknesses. However, this embodiment can reduce the occupied length of the axial space by radial overlap, thereby shortening the axial length of the protective bearing body 16 and the air collecting chamber 2502, directly reducing the span of the rotor shaft, increasing the first-order bending mode frequency, and reducing the risk of resonance.

[0093] Furthermore, a bearing seat mounting groove 2534 is provided at one end of the flow guide 253 that faces away from the air collecting chamber 2502. Specifically, the bearing seat mounting groove 2534 is provided on the distal end surface of the flow guide 253 and surrounds the bearing mounting groove 2533 for mounting a protective bearing seat. The size of the bearing seat mounting groove matches the outer peripheral surface of a portion of the protective bearing seat 13, and a stable connection is formed between the flow guide 253 and the protective bearing seat 13 through the mating installation. Furthermore, the bearing seat mounting groove 2534 structurally limits the flow guide 253 in the radial direction, that is, in the assembled state, the flow guide 253 abuts against the protective bearing seat 13 in the radial direction through the bearing seat mounting groove 2534, thereby preventing the flow guide 253 from shaking or deflecting in the radial direction, thereby improving the overall assembly accuracy and operational stability.

[0094] Furthermore, the bearing seat mounting groove 2534 is a stepped groove structure, recessed in steps along the axial direction and having stepped surfaces with different diameters on the inner and outer sides. This stepped groove, through the stepped structure, matches the outer diameter of a portion of the protective bearing seat 13, enabling the protective bearing seat 13 to function both radially as a limiter and axially as a positioner during insertion, thereby ensuring that the protective bearing seat 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, thereby enhancing the structural reliability and service life of the compressor 1.

[0095] In addition, the guide member 253 simultaneously performs three functions of airflow guidance, assembly port sealing and bearing installation. Compared with the split design of the traditional guide member 253 with an independent bearing seat, it effectively reduces the number of parts, reduces 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 used to be installed on the main structure of the compressor 1 and connected to the casing 11 of the compressor 1. Specifically, the compressor 1 includes a casing 11, a magnetic bearing seat 12 connected to the casing 11, and a protective bearing seat 13 connected to the magnetic bearing seat 12. The volute assembly 25 is connected to the above-mentioned casing 11 through its structural components to ensure the positioning stability of the intake system and the compression chamber. Among them, the guide member 253 is installed on the protective bearing seat 13 by bolts or a matching connection.

[0097] Furthermore, the flow guide 253 and the protective bearing seat 13 define 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 within the mounting cavity. In a preferred embodiment, the mounting cavity is an annular cavity extending axially along the shaft 14, formed by the axial extension of the flow guide 253 and the positioning step of the protective bearing seat 13. A positioning structure or retaining groove is provided within the mounting cavity to precisely secure 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 changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A volute assembly, characterized in that: The volute assembly has a radial direction and an axial direction, and defines a compression chamber. The compression chamber includes an air inlet duct, a gas collecting chamber, and a pressurized chamber that are sequentially connected. The pressurized chamber extends along the axial direction and is used to accommodate an impeller. The air inlet duct extends along a first direction. The first direction and the axial direction are located in the same plane and intersect each other, or the first direction and the axial direction are located in different planes and are spaced apart from each other. The volute assembly also includes a guide member, which is arranged in the air collecting chamber. The side of the guide member facing the air collecting chamber is configured as a guide surface, and along the axial direction, the guide surface has a first end and a second end arranged oppositely. The outer diameter of the guide surface gradually decreases from the first end to the second end, and the first end is arranged away from the pressurized chamber compared to the second end.

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

3. The volute assembly according to claim 2, characterized in that Two adjacent arc segments are connected in a tangential manner.

4. The volute assembly according to claim 2, characterized in that A straight line segment is provided between at least two adjacent arc segments, and the two arc segments are connected by the straight line segment.

5. The volute assembly according to claim 1, wherein: Along the axial direction, one end of the guide member away from the air collecting chamber is provided with a bearing mounting groove, and the bearing mounting groove is used to mount a protective bearing; Along the radial direction, at least a portion of the bearing mounting groove overlaps with the air collecting chamber.

6. The volute assembly according to claim 5, characterized in that A bearing seat mounting groove is further provided at one end of the flow guide member away from the air collecting chamber. The bearing seat mounting groove is arranged around the bearing mounting groove, and the bearing seat mounting groove is used to install and protect the bearing seat.

7. The volute assembly according to claim 6, characterized in that The bearing seat mounting groove is a step groove, and the step groove is gradually recessed from the first end to the second end.

8. The volute assembly according to claim 1, wherein: The volute assembly includes a volute body and an air inlet housing connected to each other, the volute body defines the air inlet passage, the air inlet housing defines the air collecting chamber, and the volute and the air inlet housing together define the pressurized chamber; One end of the air collecting chamber along the axial direction is communicated with the pressurized chamber, the air inlet duct passes through the inner wall of the air collecting chamber along the radial direction, the air inlet duct extends along the radial direction, and at least a portion of the air inlet duct overlaps with the air collecting chamber along the radial direction.

9. The volute assembly according to claim 8, characterized in that The air collecting chamber and the pressurized chamber have a connecting port, the air inlet duct is provided with an air inlet at one end away from the air collecting chamber in the radial direction, the connecting port has a first axis, the air inlet duct has a second axis, the first axis is parallel to the axial direction, and the first axis intersects with the second axis.

10. The volute assembly according to claim 9, characterized in that The volute assembly further includes a diverter rib extending along the second axis. The diverter rib is located in the compression chamber and is provided between the communication port and the air inlet.

11. The volute assembly according to claim 10, wherein: The volute assembly further includes an exhaust passage extending along the circumference of the volute body, one end of the exhaust passage being communicated with the pressurized chamber, and the other end of the exhaust passage forming an exhaust port.

12. The volute assembly according to claim 11, wherein: The volute assembly also includes at least one guide rib, which is arranged in the air collecting chamber and outside the connecting 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 connecting port. Along the direction of the second axis, the distance from the second end of the guide rib to the air inlet is smaller than the distance from the first end of the guide rib to the air inlet.

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

14. The volute assembly according to claim 13, wherein: The first end of the guide member extends in a direction away from the air collecting chamber to form a connecting portion, and an outer peripheral wall of the connecting portion abuts against an inner peripheral wall of the air intake housing.

15. The volute assembly according to claim 14, wherein: A blind hole is provided on the end surface of the connecting portion facing away from the gas collecting chamber, and the blind hole is used for plugging in the connecting structure.

16. The volute assembly according to any one of claims 1 to 15, characterized in that: The flow guide 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 rotating and sealingly cooperating with the circumferential outer wall of the rotating shaft.

17. The volute assembly according to claim 16, wherein: 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 sequentially spaced along the axial direction and separate a plurality of comb-tooth structures on the circumferential inner wall of the flow guide.

18. A compressor, characterized in that: It includes a housing, a magnetic bearing seat connected to the housing, and a protective bearing seat connected to the magnetic bearing seat; According to the volute assembly according to any one of claims 1 to 17, the volute assembly is connected to the casing, 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 a protective bearing is provided in the installation cavity.

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