Inter-shaft sealing structure, compressor and air conditioner

Abstract

The application relates to an inter-shaft sealing structure, a compressor and an air conditioner, relates to the technical field of dynamic sealing, and can meet the sealing requirements of high-pressure inlet section strong throttling and low-pressure outlet section strong dissipation in all working conditions. The inter-shaft sealing structure comprises a shaft sleeve, a shaft piece and a sealing unit. The shaft sleeve is provided with a positioning hole, and the shaft piece is inserted and matched with the positioning hole. The sealing unit is arranged between the shaft sleeve and the shaft piece in the radial direction, and comprises a flow guiding cavity, a jet flow section, a diffusion cavity and a flow stabilizing section which are sequentially communicated in the axial direction. The radial gap of the jet flow section is smaller than the radial gaps of the flow guiding cavity and the diffusion cavity, the radial gap of the flow stabilizing section is smaller than the radial gaps of the flow guiding cavity and the diffusion cavity, and the radial dimension of the diffusion cavity first increases and then decreases in the axial direction.

Description

Technical Field

[0001] This application relates to the field of dynamic sealing technology, and in particular to an inter-shaft sealing structure, a compressor, and an air conditioner. Background Technology

[0002] Comb seals, as the most widely used non-contact dynamic seals in centrifugal machinery, rely on multi-stage comb teeth and dynamic-static gaps to form a throttling cavity. By progressively throttling and reducing pressure, they suppress gas leakage and have core advantages such as no contact wear, adaptability to high speed and high temperature, and simple and reliable structure.

[0003] However, while traditional comb-tooth sealing structures have their advantages, their sealing effect is limited by their single throttling mechanism, making it impossible to meet the sealing requirements of strong throttling in the high-pressure intake section and strong dissipation in the low-pressure outlet section under all operating conditions. Summary of the Invention

[0004] This application provides an inter-shaft sealing structure, a compressor, and an air conditioner that can meet the sealing requirements of both high-pressure intake section with strong throttling and low-pressure outlet section with strong dissipation under all operating conditions.

[0005] This application provides an inter-shaft sealing structure, including a bushing, a shaft, and a sealing unit. The bushing has a positioning hole, and the shaft is fitted into the positioning hole. The sealing unit is radially disposed between the bushing and the shaft, and includes a drainage cavity, a jet section, a diffuser cavity, and a flow stabilizing section that are sequentially connected along the axial direction. The radial clearance of the jet section is smaller than the radial clearance of the drainage cavity and the diffuser cavity, the radial clearance of the flow stabilizing section is smaller than the radial clearance of the drainage cavity and the diffuser cavity, and the radial dimension of the diffuser cavity first increases and then decreases along the axial direction.

[0006] In some implementations, the inner wall of the diffusion cavity, which is radially close to the stator side, is an arc-shaped structure arranged axially.

[0007] In some implementations, the diffuser cavity is smoothly connected to the jet section at one end along the axial direction near the drainage cavity.

[0008] In some implementations, the end of the diffuser cavity that is axially away from the flow-guiding cavity is smoothly connected to the flow-stabilizing section.

[0009] In some embodiments, the sealing unit includes a flow deflector disposed on the arcuate inner wall of the diffusion cavity and extending circumferentially.

[0010] In some embodiments, the sealing unit includes at least two flow-dispersing elements. The at least two flow-dispersing elements are distributed at circumferential intervals along the diffusion cavity. And / or, In some implementations, at least two turbulence elements are distributed at axial intervals along the diffuser cavity.

[0011] In some embodiments, at least one baffle is axially disposed in the gap-increasing section of the diffuser cavity, and at least one baffle is axially disposed in the gap-decreasing section of the diffuser cavity.

[0012] In some implementations, the radial clearance of the drainage cavity decreases axially toward the jet section.

[0013] In some implementations, the radial clearance of the jet section is smaller than that of the steady flow section.

[0014] In some embodiments, the radial dimension of the jet section is equal to the radial dimension of the flow stabilization section, and the sealing unit also includes a jet ring located in the jet section, the jet ring being arranged radially at intervals from the bushing and shaft.

[0015] In some embodiments, there are multiple sealing units, which are distributed sequentially along the axial direction between the bushing and the shaft, with the drainage cavity facing the high-pressure side.

[0016] In some implementations, the drainage cavity, jet section, diffuser cavity, and flow stabilizing section are circumferentially arranged surround structures.

[0017] In some embodiments, the bushing is a stator, the shaft is a rotor, and the sealing unit is located on the inner wall of the positioning hole.

[0018] In some embodiments, the bushing is a rotor, the shaft is a stator, and the sealing unit is located on the outer wall of the corresponding positioning hole of the shaft.

[0019] Secondly, this application provides a compressor, characterized in that it includes the inter-shaft sealing structure described in the first aspect.

[0020] Thirdly, this application provides an air conditioner, characterized in that it includes the compressor described in the second aspect.

[0021] The technical solutions provided in this application have the following advantages compared with the prior art: This inter-shaft sealing structure uses a sealing unit between the bushing and the shaft component. This sealing unit is configured as a combination of a drainage chamber, a jet section, a diffuser chamber, and a stabilizing section, connected sequentially from the inside out. As the fluid flows through the drainage chamber and jet section, the smaller radial clearance at the jet section, the higher the static pressure in the inner drainage chamber, and the higher the fluid velocity and resistance at the jet section, resulting in a strong throttling effect on the high-pressure intake side. The fluid in the jet section has a higher velocity, increasing its kinetic energy and thus its energy dissipation. Furthermore, the fluid entering the diffuser chamber flows from the inside out, adhering to the inner wall, and undergoes effective diffusion and mixing within the chamber, thereby dissipating fluid energy, reducing fluid velocity, and increasing static pressure to resist leakage. Subsequently, the fluid flows outward through the stabilizing section. Due to the gentler shape of the stabilizing section, the flow velocity decreases uniformly and backflow is suppressed, stabilizing the pressure field within the chamber and preventing pressure pulsations from being transmitted upstream.

[0022] Thus, the aforementioned dynamic sealing unit between shafts can effectively suppress fluid leakage and meet the sealing requirements of the entire operating condition, including strong throttling in the high-pressure intake section and strong dissipation in the low-pressure outlet section. This reduces large-scale eddy backflow and pressure pulsation, thereby improving sealing efficiency and enhancing the stability of rotor operation. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 A cross-sectional view of a shaft sealing structure provided in an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of point C in the middle; Figure 3 for Figure 2 A partially enlarged schematic diagram of a sealing unit shown in the figure; Figure 4 for Figure 2A schematic diagram of the inner wall structure of the bushing when it is unfolded; Figure 5 for Figure 3 A cross-sectional view along line DD.

[0027] Icon labels: 100, Bushing; 110, Locating Hole; 200, Shaft; 300, Sealing Unit; 310, Drainage Chamber; 320, Jet Section; 330, Diffuser Chamber; 340, Flow Stabilizing Section; 350, Bumper Component; 360, Jet Ring; 370, Connecting Block; A, High-Pressure Side; B, Low-Pressure Side; X, Axial. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement 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," "front," "back," 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 undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will 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. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0031] Comb seals, as the most widely used non-contact dynamic seals in centrifugal machinery, rely on multi-stage comb teeth and dynamic-static gaps to form a throttling cavity. By progressively throttling and reducing pressure, they suppress gas leakage and have core advantages such as no contact wear, adaptability to high speed and high temperature, and simple and reliable structure.

[0032] However, while traditional comb-tooth sealing structures have their advantages, their sealing effect is limited by their single throttling mechanism, making it impossible to meet the sealing requirements of strong throttling in the high-pressure intake section and strong dissipation in the low-pressure outlet section under all operating conditions.

[0033] Please see Figures 1 to 5 This application provides an inter-shaft sealing structure, a compressor, and an air conditioner that can meet the sealing requirements of both the high-pressure intake section with strong throttling and the low-pressure outlet section with strong dissipation under all operating conditions.

[0034] Firstly, this application provides an inter-shaft sealing structure, such as... Figure 1 and Figure 2 As shown, the shaft sealing structure includes a bushing 100, a shaft member 200, and a sealing unit 300. The bushing 100 is provided with a positioning hole 110, and the shaft member 200 is inserted into and adapted to the positioning hole 110.

[0035] The bushing 100 can be a fixed component, such as the housing or stator of a motor or compressor, with an axially extending positioning hole 110 machined inside. The shaft 200 can be the rotor or main shaft of a motor or compressor, and the external dimensions of the shaft 200 match the positioning hole 110, allowing for a mating fit.

[0036] For example, the bushing 100 is a stator structure, the shaft 200 is a rotor structure, and the shaft 200 is positioned in the positioning hole 110 by bearing insertion, so that a radial clearance is formed between the shaft 200 and the inner wall of the positioning hole 110. For example, the positioning hole 110 can be a cylindrical hole or a tapered hole, and the shaft 200 can be a corresponding cylindrical shaft or tapered shaft.

[0037] Combination Figure 3 A sealing unit 300 is radially disposed between the bushing 100 and the shaft 200. The sealing unit 300 includes a drainage cavity 310, a jet section 320, a diffuser cavity 330, and a flow stabilizing section 340 that are sequentially connected along the axial direction X. The radial clearance of the jet section 320 is smaller than the radial clearance of the drainage cavity 310 and the diffuser cavity 330, and the radial clearance of the flow stabilizing section 340 is smaller than the radial clearance of the drainage cavity 310 and the diffuser cavity 330. The radial dimension of the diffuser cavity 330 first increases and then decreases along the axial direction X.

[0038] Taking a bushing 100 as a stator structure and a shaft 200 as a rotor structure as an example, a sealing unit 300 extending axially can be provided on the inner wall of the positioning hole 110. Alternatively, two or more sealing units 300 can be provided and distributed sequentially along the axial direction X.

[0039] At this time, as Figure 3 As shown, the air inlet side of the sealing unit 300 is the high-pressure side A, and the air outlet side of the sealing unit 300 is the low-pressure side B. This is to allow the fluid on the high-pressure side A along the axial direction of the bushing 100 to flow to the low-pressure side B through the sealing unit 300 at the aforementioned radial gap.

[0040] Specifically, an annular drainage cavity 310 with a relatively large radial clearance serves as the inlet to collect and guide fluid into subsequent sections. The jet section 320 is an annular channel with a smaller radial clearance for accelerating the fluid. The radial clearance of the jet section 320 is designed to be smaller than that of the drainage cavity 310 and the diffuser cavity 330. For example, the radial clearances of the drainage cavity 310 and the diffuser cavity 330 can be large, while the radial clearance of the jet section 320 is significantly reduced, thereby creating a throttling effect as the fluid passes through, causing its velocity to increase sharply and forming a high-speed jet. This design helps to establish dynamic pressure at the jet section 320 and control fluid leakage.

[0041] At this time, in the jet section 320 with a smaller radial clearance, the greater the static pressure of the inner drainage cavity 310, the higher the fluid velocity and the greater the fluid resistance in the jet section 320, which makes the sealing unit 300 have a strong throttling effect on the high-pressure intake side.

[0042] The diffuser cavity 330 can be an annular cavity with a variable radial clearance for fluid diffusion. The radial dimension of the diffuser cavity 330 is designed to first increase and then decrease along the axial direction X. For example, the inner wall of the diffuser cavity 330 has two inclined surfaces; the first inclined surface gradually increases the radial clearance, and the second inclined surface gradually decreases the radial clearance. Alternatively, the radial dimension of the diffuser cavity 330 can be composed of multiple straight or curved segments, forming a profile that is wide in the middle and narrow at both ends. This geometry aims to guide the fluid, after entering the diffuser cavity 330 through the jet section 320, to flow from the inside (i.e., the high-pressure side B) to the outside (i.e., the low-pressure side A) of the diffuser cavity 330, adhering to the inner wall of the diffuser cavity 330, and to achieve effective diffusion and mixing within the cavity, thereby dissipating fluid energy, reducing fluid velocity, and increasing static pressure to resist leakage.

[0043] The flow stabilization section 340 can be an annular channel with a constant radial clearance for stabilizing the fluid. These cavities can be formed by a series of annular walls and toothed structures to ensure that the fluid passes sequentially along the axial direction X.

[0044] The radial clearance of the flow stabilizing section 340 is smaller than that of the drainage cavity 310 and the diffuser cavity 330. For example, the radial clearance of the flow stabilizing section 340 can be equal to, or larger than, the radial clearance of the jet section 320 but still smaller than that of the drainage cavity 310 and the diffuser cavity 330. This design helps to further stabilize and rectify the flow after the fluid leaves the diffuser cavity 330 through a channel with a smaller size, reducing turbulence and pressure fluctuations at the fluid outlet, thereby improving the overall stability of the sealing structure.

[0045] This inter-shaft sealing structure uses a sealing unit 300 between the bushing 100 and the shaft 200. The sealing unit 300 is configured to sequentially connect a drainage chamber 310, a jet section 320, a diffuser chamber 330, and a flow stabilizing section 340 from the inside out. Thus, when the fluid flows through the drainage chamber 310 and the jet section 320, due to the smaller radial clearance at the jet section 320, the higher the static pressure in the inner drainage chamber 310, the higher the fluid velocity and the greater the fluid resistance at the jet section 320. This results in a strong throttling effect of the sealing unit 300 on the high-pressure intake side. The fluid passing through the jet section 320 has a higher velocity, increasing the fluid's kinetic energy and thus enhancing its energy dissipation. Furthermore, the fluid entering the diffuser chamber 330 flows from the inside out, adhering to the inner wall, and undergoes effective diffusion and mixing within the chamber, thereby dissipating fluid energy, reducing fluid velocity, and increasing static pressure to resist leakage. Subsequently, the fluid flows outward through the stabilizing section 340. As the cavity shape of the stabilizing section 340 tends to be gentle, the flow velocity is reduced uniformly and reverse backflow is suppressed, so as to stabilize the pressure field inside the cavity and prevent pressure pulsation from being transmitted upstream.

[0046] Thus, the aforementioned dynamic inter-shaft sealing unit 300 can effectively suppress fluid leakage and meet the sealing requirements of the entire operating condition, including strong throttling in the high-pressure intake section and strong dissipation in the low-pressure outlet section. This reduces large-scale eddy backflow and pressure pulsation, thereby improving sealing efficiency and enhancing the stability of rotor operation.

[0047] It should be noted that in the above embodiment, the sealing unit 300 is disposed at the bushing 100 of the stator structure. That is, a dynamic seal is formed between the sealing unit 300 disposed on the inner wall of the positioning hole 110 and the rotating shaft 200. This structure is widely used in various rotating machinery, such as compressors, pumps or turbines, where the shaft 200 needs to pass through a fixed housing and rotate.

[0048] In some other embodiments, the bushing 100 may be configured as a rotor structure and the shaft 200 as a stator structure. In this case, the sealing unit 300 may be located on the outer wall of the corresponding positioning hole 110 of the shaft 200 to avoid the sealing unit 300 located on the bushing 100 from affecting the dynamic balance of the rotor structure.

[0049] In this embodiment, the drainage cavity 310, jet section 320, diffuser cavity 330, and flow stabilizing section 340 are circumferentially arranged ring structures. That is, these fluid channel components form a continuous annular space between the bushing 100 and the shaft 200. This ring structure ensures uniform distribution and flow of fluid throughout the circumference, thereby maintaining consistent sealing action across the entire circumference of the shaft and effectively avoiding the risk of leakage in localized areas due to uneven fluid distribution.

[0050] In some embodiments, such as Figure 2 As shown, there are multiple sealing units 300, which are sequentially distributed along the axial direction X between the bushing 100 and the shaft 200, and combined... Figure 3 Furthermore, the drainage cavity 310 is positioned facing the high-pressure side A. This means that by employing multiple sealing units 300 sequentially distributed along the axial direction X, the sealing path can be effectively extended, significantly improving the overall sealing performance and reliability of the inter-shaft sealing structure under high pressure differential or long axial sealing requirements. The positioning of the drainage cavity 310 facing the high-pressure side A ensures that fluid can effectively enter the sealing unit 300 from the high-pressure side, thereby optimizing the internal flow field distribution and enhancing the sealing effect.

[0051] In some embodiments, such as Figure 3 As shown, the inner wall of the diffuser cavity 330, radially close to the stator side (i.e., bushing 100), is an arc-shaped structure arranged along the axial direction X. The arc-shaped structure refers to the continuous, smooth curve profile of the inner wall of the diffuser cavity 330 in the axial direction X, rather than a straight line segment or sharp angle turn. This arc-shaped design aims to optimize the flow characteristics of the fluid within the diffuser cavity 330. Specifically, the arc-shaped structure can be a circular arc segment, a parabolic segment, an elliptical arc segment, or a composite curve smoothly connected from multiple curve segments. Its curvature can be optimized according to operating parameters such as fluid type, flow velocity, and pressure to ensure that after passing through the jet section 320, the fluid can enter the diffuser cavity 330 with minimal energy loss and in the most stable manner, achieving effective diffusion. The arc-shaped inner wall helps guide the fluid to flow smoothly along the wall surface, avoiding fluid separation and the generation of backflow zones caused by sudden changes in cross-section.

[0052] The arc-shaped structure provides a smoother, more gradual channel for the fluid. When the fluid enters the diffuser cavity 330 at high speed from the jet section 320, the arc-shaped inner wall effectively guides the fluid to gradually expand, avoiding violent impacts or sudden separation between the fluid and the wall, thus significantly reducing the generation of eddies and energy dissipation. This optimized fluid diffusion process helps maintain the integrity and stability of the streamlines, reduces fluid resistance, and improves the pressure recovery efficiency of the diffuser cavity 330. Ultimately, this enables the entire sealing unit 300 to achieve more stable fluid control during operation, improving the overall sealing performance and operational reliability of the inter-shaft sealing structure.

[0053] At this time, the end of the diffuser cavity 330 near the drainage cavity 310 along the axial direction X is smoothly connected to the jet section 320. Alternatively, the end of the diffuser cavity 330 away from the drainage cavity 310 along the axial direction X can be smoothly connected to the flow stabilizing section 340.

[0054] A smooth transition refers to a geometrically distinct transition area between two adjacent cavities or segments where there are no sharp edges, steps, or abrupt changes in cross-section. This can be achieved through methods such as rounded transitions, gradual slope transitions, or the use of Bézier curves.

[0055] By smoothly connecting the diffuser cavity 330 with the jet section 320 and the stabilizing section 340, the flow state of the fluid in these key transition regions is significantly improved. When the fluid enters the diffuser cavity 330 from the jet section 320, the smooth inlet transition avoids fluid impact and local high pressure, reduces fluid separation and eddy current generation, thereby reducing energy loss. Similarly, when the fluid enters the stabilizing section 340 from the diffuser cavity 330, the smooth outlet transition ensures that the streamlines can contract smoothly, effectively suppressing fluid separation and backflow at the outlet, further reducing pressure fluctuations and turbulence. Combined with the arc-shaped inner wall structure of the diffuser cavity 330, this smooth connection makes the flow field inside the entire sealing unit 300 more stable and uniform, effectively reducing fluid resistance, improving sealing efficiency, and extending the service life of the sealing structure.

[0056] In some embodiments, such as Figure 3 and Figure 4 As shown, the sealing unit 300 includes a flow-disrupting element 350, which is disposed on the arc-shaped inner wall of the diffusion cavity 330 and extends circumferentially.

[0057] For example, the sealing unit 300 includes at least two baffles 350. The at least two baffles 350 are distributed circumferentially around the diffuser cavity 330. Alternatively, the at least two baffles 350 may be distributed axially around the diffuser cavity 330.

[0058] By setting at least two flow-disrupting elements 350, more disturbance sources can be provided, allowing the fluid to be subjected to more comprehensive and continuous disturbance when passing through the diffuser cavity 330. This effectively avoids the problem of limited disturbance range or uneven disturbance effect that may be caused by a single flow-disrupting element 350.

[0059] In this configuration, at least one baffle 350 may be disposed along the axial direction X in the gap-increasing section of the diffuser cavity 330, and at least one baffle 350 may be disposed along the axial direction X in the gap-decreasing section of the diffuser cavity 330. For example, each sealing unit 300 may include two baffles 350, one disposed at the inner end of the radially increasing gap and the other disposed at the outer end of the radially decreasing gap, with the two baffles 350 partially overlapping or spaced apart along the circumferential direction.

[0060] The turbulence-dissipating element 350 is a radially protruding baffle structure used to cut and break up the large-scale vortex system in the diffusion cavity 330 to enhance the entrainment and mixing effect, thereby constructing a multi-scale vortex dissipation field in the diffusion cavity 330. Thus, under the combined effect of the jet entrainment effect and the multi-stage diffusion structure, the fluid pressure is greatly reduced to prevent inflow and leakage.

[0061] In some embodiments, such as Figure 3 As shown, the radial clearance of the drainage cavity 310 decreases along the axial direction X towards the jet section 320. Taking the inner wall of the drainage cavity 310 located at the bushing 100 as an example, the inner wall of the drainage cavity 310 gradually contracts in the direction of fluid flow towards the jet section 320, causing the radial dimension of the fluid channel to gradually decrease. This contraction structure can be an arc-shaped structure, that is, the wall surface of the drainage cavity 310 presents a smooth curve transition, forming a gradually narrowing nozzle-shaped inlet. It can also be a straight structure, that is, the wall surface of the drainage cavity 310 contracts linearly with a certain taper, forming a conical inlet.

[0062] Regardless of the structure used, its core function is to pre-accelerate and guide the fluid entering the jet section 320, ensuring that the fluid can enter the jet section 320 in a more stable and concentrated manner.

[0063] By designing a gradually narrowing drainage cavity 310, the fluid velocity is smoothly increased before entering the jet section 320, resulting in more regular streamlines. This effectively avoids fluid separation, eddy formation, and unnecessary energy loss caused by abrupt changes in the flow channel cross-section. This optimized fluid inlet condition allows the jet section 320 to more efficiently form a stable, high-speed jet, significantly improving the overall efficiency and sealing performance of the sealing unit 300. Simultaneously, it reduces turbulence and pressure fluctuations in the transition region (i.e., at the drainage cavity 310), thereby lowering noise and vibration during system operation.

[0064] Since a high-speed jet is required in the jet section 320, and a smooth and gradual flow velocity is needed in the stabilizing section 340, the radial clearance of the jet section 320 can be set smaller than that of the stabilizing section 340. In this case, the inner wall of the positioning hole 110 can be used as a reference, and the jet section 320 becomes the inner wall of the positioning hole 110. Based on this, the inner diameter of the stabilizing section 340 is slightly larger than that of the jet section 320. Simultaneously, the hole wall of the positioning hole 110 is further enlarged to form the corresponding drainage cavity 310 and diffusion cavity 330, which simplifies the processing steps of the sealing unit 300.

[0065] It should be noted that during the formation of the diffuser cavity 330, the turbulence-inducing component 350 and the bushing 100 can be designed as an integrally formed structure.

[0066] Or, such as Figure 3 As shown, the radial dimension of the jet section 320 can also be set to be equal to the radial dimension of the stabilizing section 340, that is, the inner walls of the jet section 320 and the stabilizing section 340 are the positioning hole 110 (refer to...). Figure 2 The inner wall of the sealing unit 300. The sealing unit 300 also includes a jet ring 360, which is located in the jet section 320 and is arranged radially at intervals from the bushing 100 and the shaft 200.

[0067] For example, the jet ring 360 is fixedly connected to the bushing 100. Figure 5 As shown, the sealing unit 300 also includes multiple connecting blocks 370, which are spaced apart circumferentially. Each connecting block 370 is fixedly connected to the inner wall of the jet ring 360 and the bushing 100 for positioning the jet ring. In this case, the radial gap between the jet ring 360 and the bushing 100 is used to accelerate the fluid flow rate. The gap between the jet ring 360 and the shaft 200 is used both for the insertion of the shaft 200 and for accelerating the fluid flow rate.

[0068] Thus, the jet ring 360 and the bushing 100 can be separate components, which are fixedly connected by welding after being processed and formed separately, and multiple welding points form the connecting block 370. Alternatively, the jet ring 360 and the bushing 100 can be set as an integral structure, such as the bushing 100 being a two-piece or multi-piece separate structure, and then the sealing unit 300 including the jet ring 360 is formed by turning the inner side of the bushing 100.

[0069] Alternatively, if the bushing 100 is a rotor and the shaft 200 is a stator, a connecting block 370 can be provided radially between the jet ring 360 and the shaft 200 for positioning connection of the jet ring.

[0070] Among them, the jet ring 360 and the connecting block 370 are provided with an outer rounded corner or outer chamfer structure at the end facing the high-pressure side A to reduce vibration and noise when in contact with the fluid.

[0071] By introducing a jet ring 360 into the jet section 320, the formation and stabilization of the fluid jet can be more precisely controlled. The jet ring 360 can further narrow the fluid channel, increase the fluid velocity, enhance the momentum of the jet, and help reduce turbulence at the outlet of the jet section 320. This allows the fluid to enter the diffuser cavity 330 more stably and uniformly, which helps to improve sealing efficiency, reduce fluid leakage, and optimize the energy consumption performance of the entire sealing system.

[0072] The design of multiple circumferential connection points in the jet ring 360 ensures structural strength while minimizing interference with the fluid channel, thus ensuring smooth fluid flow.

[0073] Secondly, embodiments of this application provide a compressor that includes the inter-shaft sealing structure described in the first aspect. Since this compressor includes the inter-shaft sealing structure described in the first aspect, it possesses all the effects of the embodiments involving the aforementioned inter-shaft sealing structure, which will not be repeated here.

[0074] Thirdly, embodiments of this application provide an air conditioner that includes the compressor described in the second aspect. Since this air conditioner includes the compressor described in the second aspect, it possesses all the effects of the compressor-related embodiments described above, which will not be repeated here.

[0075] 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.

[0076] 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.

[0077] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An inter-shaft sealing structure, characterized in that, include: A bushing (100) is provided with a positioning hole (110). Shaft (200), which is adapted to be inserted into the positioning hole (110); And a sealing unit (300), which is radially disposed between the bushing (100) and the shaft (200). The sealing unit (300) includes a drainage cavity (310), a jet section (320), a diffusion cavity (330) and a flow stabilizing section (340) that are connected sequentially along the axial direction. The radial clearance of the jet section (320) is smaller than the radial clearance of the drainage cavity (310) and the diffusion cavity (330). The radial clearance of the flow stabilizing section (340) is smaller than the radial clearance of the drainage cavity (310) and the diffusion cavity (330). The radial dimension of the diffusion cavity (330) first increases and then decreases along the axial direction.

2. The inter-shaft sealing structure according to claim 1, characterized in that, The inner wall of the diffusion cavity (330) near the stator side in the radial direction is an arc-shaped structure arranged in the axial direction.

3. The inter-shaft sealing structure according to claim 2, characterized in that, The diffuser cavity (330) is smoothly connected axially to the jet section (320) at one end near the drainage cavity (310); and / or, The end of the diffusion cavity (330) that is axially away from the drainage cavity (310) is smoothly connected to the flow stabilizing section (340).

4. The inter-shaft sealing structure according to claim 2, characterized in that, The sealing unit (300) includes a baffle (350) disposed on the arc-shaped inner wall of the diffusion cavity (330) and extending circumferentially.

5. The inter-shaft sealing structure according to claim 4, characterized in that, The sealing unit (300) includes at least two of the aforementioned baffles (350); At least two of the aforementioned baffles (350) are distributed at circumferential intervals along the diffuser cavity (330); and / or, At least two of the aforementioned baffles (350) are distributed at axial intervals along the diffuser cavity (330); and / or, At least one of the aforementioned baffles (350) is axially disposed in the increasing gap region of the diffuser cavity (330), and at least one of the aforementioned baffles (350) is axially disposed in the decreasing gap region of the diffuser cavity (330).

6. The inter-shaft sealing structure according to any one of claims 1-5, characterized in that, The radial clearance (arc-shaped structure, straight structure) of the drainage cavity (310) decreases along the axial direction toward the jet section (320).

7. The inter-shaft sealing structure according to any one of claims 1-5, characterized in that, The radial clearance of the jet section (320) is smaller than the radial clearance of the stabilizing section (340); or, The radial dimension of the jet section (320) is equal to the radial dimension of the flow stabilizing section (340). The sealing unit (300) also includes a jet ring (360), which is located in the jet section (320). The jet ring (360) is radially spaced from the bushing (100) and the shaft (200) (the jet ring (360) is connected to the bushing (100), and multiple connection points are distributed circumferentially).

8. The inter-shaft sealing structure according to any one of claims 1-5, characterized in that, The number of sealing units (300) is multiple, and the multiple sealing units (300) are sequentially distributed along the axial direction between the bushing (100) and the shaft (200), and the drainage cavity (310) is arranged facing the high-pressure side; and / or, The drainage cavity (310), the jet section (320), the diffuser cavity (330), and the flow stabilizing section (340) are circumferentially arranged surround structures; and / or, The bushing (100) is a stator, the shaft (200) is a rotor, and the sealing unit (300) is disposed on the inner wall of the positioning hole (110); or, The bushing (100) is a rotor, the shaft (200) is a stator, and the sealing unit (300) is located on the outer wall of the shaft (200) corresponding to the positioning hole (110).

9. A compressor, characterized in that, Includes the inter-shaft sealing structure according to any one of claims 1-8.

10. An air conditioner, characterized in that, Includes the compressor as described in claim 9.

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