Centrifugal compressor system

Abstract

The invention relates to the technical field of centrifugal compressors, and discloses a centrifugal compressor system which comprises a compressor assembly and a centrifugal compressor, the compressor assembly comprises an impeller, an impeller housing, a diffuser and a volute, the impeller is arranged on the impeller housing, the diffuser is arranged at an outlet of the impeller, and the volute is connected with the impeller housing and arranged on the outlet side of the diffuser; and the ultrasonic generator is fixed on at least one of the impeller housing and the diffuser. Therefore, the centrifugal compressor system utilizes the ultrasonic waves to slightly vibrate and mix the working medium gas in the system, so that the low-energy fluid in the boundary layer can continuously obtain energy injection of the fluid in the main flow area, the kinetic energy of the boundary layer and the turbulent kinetic energy of the main flow area are improved, separation is delayed, surge is delayed, the surge allowance is increased, and the separation efficiency is improved. In addition, the maximum bearing load of the blades can be increased, the efficiency of the centrifugal machine is improved, and the gas compressor assembly can keep stable operation under wider working conditions.

Description

Technical Field

[0001] This invention relates to the field of centrifugal compressor technology, and in particular to a centrifugal compressor system. Background Technology

[0002] Centrifugal compressors are efficient, lightweight, and stable air compression devices, and are widely used in automotive, marine, and aerospace technologies. Centrifugal compressors have advantages such as high single-stage pressure ratio, wide operating range, simple and compact structure, few parts, and high reliability.

[0003] In related technologies, the operating range of centrifugal compressors is limited. Especially under low flow conditions, large-scale flow separation and other phenomena may occur in centrifugal compressors, which may lead to unstable flow inside the centrifugal compressor, causing stall or even surge. This can easily cause a decrease in the pressure ratio and efficiency of the centrifugal compressor, as well as generate severe axial vibration and noise, shorten the life of the centrifugal compressor, and may even cause damage to the centrifugal compressor in a short period of time. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this invention is to provide a centrifugal compressor system that can achieve topological stabilization through an ultrasonic generator, thereby promoting the mixing of the working gas using ultrasound, improving the flow state inside the compressor assembly, preventing large-scale flow separation phenomena, and contributing to improving the stability and reliability of the compressor assembly operation.

[0005] A centrifugal compressor system according to an embodiment of this application includes: a compressor assembly, the compressor assembly including an impeller, an impeller casing, a diffuser, and a volute, the impeller being disposed on the impeller casing, the diffuser being disposed at the outlet of the impeller, and the volute being connected to the impeller casing and disposed on the outlet side of the diffuser; and at least one ultrasonic generator, the ultrasonic generator being fixed on at least one of the impeller casing and the diffuser.

[0006] According to the centrifugal compressor system of this application embodiment, an ultrasonic generator can be installed at the impeller casing and diffuser of the compressor assembly. The ultrasonic generator can emit ultrasound, thereby using ultrasonic technology to promote the mixing of the working gas and reduce flow separation, thus effectively eliminating or delaying the occurrence of surge. Therefore, the centrifugal compressor system can use the ultrasonic generator to delay the occurrence of surge under low flow conditions, increasing the surge margin and improving the operating range and adaptability of the compressor assembly, enabling the compressor assembly to maintain stable operation under a wider range of operating conditions.

[0007] According to some embodiments of this application, the ultrasonic generator includes a first ultrasonic generator disposed on the impeller casing and located circumferentially outside the impeller.

[0008] According to some embodiments of this application, there are multiple first ultrasonic generators, and the multiple first ultrasonic generators are arranged at intervals along the circumferential direction of the impeller casing.

[0009] According to some embodiments of this application, the ultrasonic generator includes a second ultrasonic generator disposed in the diffuser and located circumferentially outside the impeller casing.

[0010] According to some embodiments of this application, there are multiple second ultrasonic generators, and the multiple second ultrasonic generators are arranged at intervals along the circumferential direction of the diffuser.

[0011] According to some embodiments of this application, in the axial projection of the compressor assembly, the central axes of the first ultrasonic generator, the second ultrasonic generator, and the impeller are arranged non-collinearly.

[0012] According to some embodiments of this application, the compressor assembly further includes: a mounting base disposed on the impeller housing or the diffuser and used to arrange the ultrasonic generator; and a fixing member disposed on the mounting base and used to fix the ultrasonic generator to the mounting base.

[0013] According to some embodiments of this application, the mounting base is provided with a mounting hole for accommodating at least a portion of the ultrasonic generator and opening to one side of the compressor assembly in the axial direction. The angle between the axial direction of the mounting hole and the central axis of the impeller is α, and satisfies the relationship: 30°≤α≤60°.

[0014] According to some embodiments of this application, there are multiple mounting bases, each of which is provided with a mounting hole for accommodating at least a portion of the ultrasonic generator. The axial direction of each mounting hole intersects with the central axis of the impeller, and the angle between the axial direction of at least two mounting holes and the central axis of the impeller is different.

[0015] According to some embodiments of this application, the impeller casing has a first through hole on its wall surface, the first through hole being used to accommodate and install the ultrasonic generator; and / or, the diffuser has a second through hole, the second through hole being used to accommodate and install the ultrasonic generator; and / or, the impeller casing has a first receiving groove, the first receiving groove being used to accommodate the ultrasonic generator; and / or, the diffuser has a second receiving groove, the second receiving groove being used to accommodate the ultrasonic generator.

[0016] According to some embodiments of this application, the ultrasonic output power of the ultrasonic generator is not less than 0.1 W / cm². 2 ; and / or, the ultrasonic frequency output by the ultrasonic generator is in the range of 20kHz-100kHz.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a centrifugal compressor system according to an embodiment of this application. Figure 1 ; Figure 2 yes Figure 1 Sectional view at centerline AA; Figure 3 yes Figure 1 A magnified view of the area circled at point B.

[0019] Figure label: Centrifugal compressor system 100; Compressor assembly 1; Impeller 11; Impeller casing 12; Diffuser 13; Volute 14; Ultrasonic generator 2; First ultrasonic generator 21; Second ultrasonic generator 22; Mounting bracket 3. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-3 A centrifugal compressor system 100 according to an embodiment of the present invention is described.

[0022] A centrifugal compressor system 100 according to an embodiment of this application includes: a compressor assembly 1 and at least one ultrasonic generator 2.

[0023] Combination Figure 1 and Figure 2As shown, the compressor assembly 1 includes an impeller 11, an impeller casing 12, a diffuser 13, and a volute 14. The impeller 11 is disposed inside the impeller casing 12, the diffuser 13 is disposed at the outlet of the impeller 11, and the volute 14 is connected to the impeller casing 12 and disposed at the outlet side of the diffuser 13, so as to convert the kinetic energy of the gas into pressure energy through the diffuser 13.

[0024] The diffuser 13 can be used to convert the kinetic pressure of the wind turbine into static pressure, thereby reducing the gas velocity and increasing the pressure, thus converting kinetic energy into static pressure energy.

[0025] Understandably, the gas discharged from the impeller 11 can flow to the diffuser 13, which is used to convert the kinetic energy of the gas discharged from the impeller 11 into pressure energy. The volute 14 located on the outlet side of the diffuser 13 can collect and summarize the gas discharged from the diffuser 13. The volute 14 can discharge the gas through the exhaust port, thereby realizing the high-pressure gas output of the centrifugal compressor system 100.

[0026] Combination Figure 1 and Figure 2 As shown, the centrifugal compressor system 100 is equipped with at least one ultrasonic generator 2, which is fixed to at least one of the impeller casing 12 and the diffuser 13. The ultrasonic generator 2 can output ultrasonic waves, which can act on the compressor assembly 1 and promote the mixing of the working gas, thereby improving the flow state of the working gas in the centrifugal compressor system 100, preventing the generation of large-scale flow separation phenomena, and helping to improve the stability and reliability of the centrifugal compressor system 100.

[0027] Meanwhile, under the action of the ultrasonic generator 2, the occurrence of surge in the centrifugal compressor system 100 under low flow conditions can be effectively delayed, the surge margin can be increased, and the working range and adaptability of the centrifugal compressor system 100 can be significantly improved, so that the centrifugal compressor system 100 can maintain stable operation under a wider range of working conditions.

[0028] The impeller housing 12 and diffuser 13 in the compressor assembly 1 serve as the mounting carriers for the ultrasonic generator. This allows the ultrasonic generator 2 to be positioned within the compressor assembly 1 according to the flow field of the working gas. This enables the centrifugal compressor system 100 to promote the mixing of the working gas through the ultrasonic generator 2, thereby improving the flow state of the working gas inside the compressor assembly 1 and enhancing the operational stability and reliability of the centrifugal compressor system 100.

[0029] Reference Figure 1As shown, there can be multiple ultrasonic generators 2. In some embodiments, some of the multiple ultrasonic generators 2 can be mounted and fixed on the impeller housing 12, while other ultrasonic generators 2 are mounted and fixed at the diffuser 13; in other embodiments, all of the multiple ultrasonic generators 2 are mounted and fixed at the impeller housing 12; in still other embodiments, all of the multiple ultrasonic generators 2 are mounted and fixed at the diffuser 13. When there is only one ultrasonic generator 2, the ultrasonic generator 2 can be located at either the impeller housing 12 or the diffuser 13.

[0030] The ultrasonic waves output by the ultrasonic generator 2 can cause slight vibration and mixing of the working gas on one side of the compressor assembly 1, so that the low-energy fluid in the boundary layer can continuously obtain energy injection from the fluid in the mainstream region, thereby increasing the kinetic energy of the boundary layer and the turbulent kinetic energy of the mainstream region, thus delaying separation, delaying the occurrence of surge, increasing the surge margin, and increasing the maximum load that the blades can withstand, thereby improving the centrifuge efficiency.

[0031] It should be noted that centrifugal compressors are efficient, lightweight, and stable air compression devices, widely used in automotive, marine, and aerospace technologies. They offer advantages such as high single-stage pressure ratio, wide operating range, simple and compact structure, fewer parts, and high reliability. However, centrifugal compressors have a limited operating range, especially at low flow rates. Large-scale flow separation can occur within the compressor, leading to unstable internal flow, stalling, or even surge. This can cause a decrease in pressure ratio and efficiency, as well as severe axial vibration and noise, shortening the compressor's lifespan and potentially causing damage within a short period.

[0032] Surge can be induced in various locations within the impeller, diffuser, and centrifugal compressor. Gas flow separation and expansion are the causes of stall and surge. In a centrifugal compressor, the boundary layer within the impeller and diffuser flow channels is a layer of low-energy fluid near the wall. As the fluid pressure gradually increases from the diffuser inlet to the diffuser outlet, a reverse pressure gradient exists, causing the low-energy fluid to gradually decrease in velocity, accumulate, and thicken. When the kinetic energy of the low-energy fluid within the boundary layer is insufficient to resist the reverse pressure gradient, the fluid velocity drops to zero, leading to backflow and separation.

[0033] Meanwhile, the diffuser in a traditional centrifugal compressor also has an inherent theoretical defect that can induce stall. In related technologies, the diffuser in a centrifugal compressor is usually an axisymmetric vaned diffuser. The blade installation angle of the diffuser is determined by the design point operating conditions to obtain optimal performance under the assumption of uniform circumferential flow. However, due to the presence of components such as the volute, the internal flow field of a centrifugal compressor is circumferentially non-uniform. When the centrifugal compressor operates at low flow rates, the non-uniform flow field leads to large-scale flow separation in the vaned diffuser. This unstable flow not only reduces the efficiency of the diffuser but may also lead to even larger-scale flow separation and gas backflow, thereby inducing surge in the centrifugal compressor.

[0034] In this application, an ultrasonic generator 2 may be installed at the impeller casing 12 and diffuser 13 of the compressor assembly 1. The ultrasonic generator 2 can emit ultrasound, thereby using ultrasonic technology to promote the mixing of the working gas and reduce flow separation, thus effectively eliminating or delaying the occurrence of surge. Therefore, the centrifugal compressor system 100 can use the ultrasonic generator 2 to delay the occurrence of surge under low flow conditions, increase the surge margin, improve the operating range and adaptability of the compressor assembly 1, and enable the compressor assembly 1 to maintain stable operation under a wider range of operating conditions.

[0035] like Figure 1 As shown, in some embodiments of this application, the ultrasonic generator 2 includes a first ultrasonic generator 21, which is disposed on the impeller housing 12 and located on the circumferential outer side of the impeller 11, so that the first ultrasonic generator 21 is arranged in a position suitable for avoiding the impeller 11, and the first ultrasonic generator 21 interferes with the movement of the impeller 11.

[0036] Understandably, in the compressor assembly 1, the impeller casing 12 serves as the mounting carrier for the impeller 11, with the impeller 11 positioned in the central region of the impeller casing 12 to achieve axial air intake and radial air delivery at the impeller 11 assembly (i.e., the impeller 11 and the impeller casing 12). By arranging the first ultrasonic generator 21 on the circumferential outer side of the impeller 11, the first ultrasonic generator 21 can avoid the impeller 11 and be positioned near the peripheral wall of the impeller casing 12. This allows the ultrasonic waves output by the first ultrasonic generator 21 to be further transmitted through the impeller casing 12, thereby promoting the mixing of the control gas at the impeller 11 assembly through ultrasonic waves and reducing the occurrence of large-scale flow separation phenomena in the impeller 11 assembly.

[0037] The impeller 11 assembly is used to convey the working gas radially to the diffuser 13. The first ultrasonic generator 21 can be used to stabilize the area where the diffuser 13 and the impeller casing 12 meet, so as to reduce the flow separation of the working gas. This helps to improve the operating stability and reliability of the compressor assembly 1 under low flow conditions, ensure the working range and adaptability of the compressor assembly 1, and enable the compressor assembly 1 to maintain stable operation under a wider range of conditions.

[0038] like Figure 1 As shown, in a further embodiment of this application, there are multiple first ultrasonic generators 21, which are arranged at intervals along the circumferential direction of the impeller casing 12. This allows the multiple first ultrasonic generators 21 to be respectively arranged in multiple regions of the impeller casing 12, thereby increasing the range of mixing and adjusting the working gas at the impeller 11 assembly by the first ultrasonic generators 21 and enriching the adjustment methods of the working gas at the impeller 11 assembly by the first ultrasonic generators 21.

[0039] It is understandable that by setting a plurality of first ultrasonic generators 21 at the impeller casing 12 and arranging the plurality of first ultrasonic generators 21 at intervals along the circumferential direction of the impeller casing 12, the range in which the first ultrasonic generators 21 can output ultrasonic waves at the impeller casing 12 can be increased. In this way, the plurality of first ultrasonic generators 21 can be controlled separately under various operating conditions to improve the stabilization effect on the centrifugal compressor system 100.

[0040] In the centrifugal compressor system 100, the compressor assembly 1 can operate under various conditions, such as low-flow and high-flow conditions. "Low-flow" and "high-flow" are two conditions with different flow rates, where the working fluid flow rate is greater in one condition (high-flow) than in the other (low-flow). When the compressor assembly 1 operates under different conditions, the flow field formed within it will also differ. In this application, multiple first ultrasonic generators 21 can output ultrasonic waves at different areas of the impeller casing 12 to specifically enhance the local mixing effect of the working fluid gas in the compressor assembly 1, ensuring the operational stability and reliability of the compressor assembly 1 under different operating conditions.

[0041] like Figure 1 As shown, in some embodiments of this application, the ultrasonic generator 2 includes a second ultrasonic generator 22, which is disposed at the diffuser 13 and located circumferentially outside the impeller casing 12, so as to arrange the second ultrasonic generator 22 in a position suitable for avoiding the impeller casing 12.

[0042] It is understandable that the second ultrasonic generator 22 is positioned near the outer periphery of the diffuser 13, allowing it to be placed close to the volute 14. This allows the diffuser 13 to further transmit the ultrasonic waves output by the second ultrasonic generator 22, thereby promoting the mixing of the control gas at the volute 14 and reducing the large-scale flow separation of the working gas delivered by the diffuser 13 to the volute 14.

[0043] Meanwhile, the diffuser 13 serves as the mounting carrier for the second ultrasonic generator 22. The ultrasonic waves output by the second ultrasonic generator 22 can be transmitted through the diffuser 13. These ultrasonic waves can also act on the working gas flowing through the diffuser 13, thereby promoting the mixing of the working gas at the diffuser 13. This improves the flow state of the working gas inside the compressor assembly 1, further enhancing the operational stability and reliability of the compressor assembly 1. In other words, the second ultrasonic generator 22 can be used to stabilize the area adjacent to the diffuser 13 and the volute 14, reducing the flow separation of the working gas. This helps improve the operational stability and reliability of the compressor assembly 1 under low-flow operating conditions, ensuring the operating range and adaptability of the compressor assembly 1, enabling it to maintain stable operation under a wider range of conditions.

[0044] like Figure 1 As shown, in some embodiments of this application, there are multiple second ultrasonic generators 22, which are arranged at intervals along the circumferential direction of the diffuser 13. This allows the multiple second ultrasonic generators 22 to be respectively arranged in multiple regions of the diffuser 13, thereby increasing the mixing and adjustment range of the working gas at the diffuser 13 and the volute 14 by the second ultrasonic generators 22 and enriching the adjustment methods of the working gas at the impeller 11 assembly by the second ultrasonic generators 22.

[0045] It is understandable that by setting multiple second ultrasonic generators 22 at the diffuser 13 and arranging them at intervals along the circumferential direction of the diffuser 13, the range in which the second ultrasonic generators 22 can output ultrasonic waves at the diffuser 13 can be increased. This allows multiple second ultrasonic generators 22 to be controlled separately under various operating conditions, thereby improving the stabilization effect on the centrifugal compressor system 100.

[0046] It should be noted that in the centrifugal compressor system 100, the multiple second ultrasonic generators 22 and the multiple first ultrasonic generators 21 mentioned above can be controlled independently, so that the multiple second ultrasonic generators 22 can output ultrasonic waves of different frequencies with different output powers, thereby further improving the mixing effect of the ultrasonic generator 2 on the working gas.

[0047] like Figure 1As shown in some embodiments of this application, in the axial projection of the compressor assembly 1, the central axes of the first ultrasonic generator 21, the second ultrasonic generator 22, and the impeller 11 are arranged non-collinearly. That is, the central axes of the first ultrasonic generator 21, the second ultrasonic generator 22, and the impeller 11 are arranged at the three vertices of a triangle, thereby allowing the first ultrasonic generator 21 and the second ultrasonic generator 22 to be staggered in the circumferential direction of the impeller 11 to avoid the two ultrasonic generating devices (i.e., the first ultrasonic generating device and the second ultrasonic generating device) being too close together, which would affect the output effect of the ultrasonic waves.

[0048] Meanwhile, by staggering the first ultrasonic generator 21 and the second ultrasonic generator 22, the range of ultrasonic waves output by the first ultrasonic generator 21 and the second ultrasonic generator 22 in the compressor assembly 1 can be guaranteed, thereby allowing the corresponding ultrasonic generator 2 to output ultrasonic waves under specific operating conditions based on the operating conditions of the compressor assembly 1.

[0049] In some embodiments, a plurality of first ultrasonic generators 21 and a plurality of second ultrasonic generators 22 may be provided in the centrifugal compressor system 100, and the central axes of any one of the first ultrasonic generators 21, any one of the second ultrasonic generators 22 and the impeller 11 are arranged non-collinearly.

[0050] It should be noted that in this application, each ultrasonic generator 2 (i.e., the first ultrasonic generator 21 and the second ultrasonic generator 22) installed in the compressor assembly can be electrically connected to an external power source through an interface (i.e., the connection structure on the ultrasonic generator 2), and each ultrasonic generator 2 can be controlled independently. That is, the two ultrasonic generators 2 can output ultrasonic waves of different frequencies with different output powers. This improves the stabilization effect and mixing mechanism of the flow field in the compressor assembly 1 by the ultrasonic generators 2, enabling the centrifugal compressor system 100 to maintain stable operation under various operating conditions and avoid surge problems.

[0051] In some embodiments of this application, the ultrasonic output power of the ultrasonic generator 2 is not less than 0.1 W / cm². 2 For example: 0.3 W / cm 2 1 W / cm 2 wait.

[0052] When the ultrasonic output power of the ultrasonic generator 2 meets the above range, it can generate reliable and effective mechanical and cavitation effects, so that the ultrasonic waves output by the ultrasonic generator 2 can act on the flow field in the compressor assembly 1, realize the effective transmission and propagation of ultrasonic waves, and promote the mixing of working gas, thereby better improving the flow state of the working gas inside the compressor assembly 1, preventing large-scale flow separation of the working gas, and helping to improve the operational stability and reliability of the compressor assembly 1.

[0053] It is understandable that if the ultrasonic output power of ultrasonic generator 2 does not meet the above parameter range (i.e., below 0.1W / cm), 2 This will result in the ultrasonic waves output by the ultrasonic generator 2 not being able to effectively pass through and transmit, meaning the ultrasonic waves cannot be effectively transmitted further through the impeller casing 12 and diffuser 13, affecting the stabilization effect on one side of the compressor assembly 1. Simultaneously, if the ultrasonic output power of the ultrasonic generator 2 is too high, it will cause vibration noise during operation. Therefore, the ultrasonic output power of the ultrasonic generator 2 is preferably around 0.1 W / cm². 2 -1W / cm 2 Within the range, such as: 0.5W / cm 2 .

[0054] In some embodiments of this application, the ultrasonic frequency output by the ultrasonic generator 2 is in the range of 20kHz-100kHz, thereby enabling the ultrasonic frequency output by the ultrasonic generator 2 to cover multiple frequency bands, such as: a low-frequency power band of 20kHz-30kHz, a mid-frequency power band of 30kHz-60kHz, and a high-frequency power band of 60kHz-100kHz. Therefore, the ultrasonic generator 2 can be controlled to output ultrasonic waves of a specific ultrasonic frequency according to the operating conditions of the compressor assembly 1.

[0055] It is understandable that when the frequency of the ultrasonic waves output by ultrasonic generator 2 is in the low-frequency power range, cavitation is strongest, which is suitable for mixing large-scale, high-viscosity airflows; when the frequency of the ultrasonic waves output by ultrasonic generator 2 is in the mid-frequency power range, cavitation is uniform; and when the frequency of the ultrasonic waves output by ultrasonic generator 2 is in the high-frequency power range, cavitation is mild.

[0056] It should be noted that the ultrasonic generator 2 can simultaneously meet the above-mentioned ultrasonic output power and ultrasonic frequency output range, so as to further improve the ultrasonic output effect of the ultrasonic generator 2 and ensure the mixing effect of the working gas on the compressor assembly 1 side.

[0057] In some embodiments of this application, the compressor assembly 1 further includes: a mounting base 3 and a fixing member. The mounting base 3 is disposed on the impeller housing 12 or the diffuser 13, and the mounting base 3 is used to arrange the ultrasonic generator 2. The fixing member is disposed on the mounting base 3 and is used to fix the ultrasonic generator 2 to the mounting base 3 to achieve the assembly and fixation of the ultrasonic generator 2.

[0058] It is understandable that the mounting base 3 serves as the mounting carrier for the ultrasonic generator 2, allowing the ultrasonic generator 2 to be placed at the mounting base 3 and further fixed by fasteners to secure it to the compressor assembly 1. The assembly method is simple and highly reliable.

[0059] It should be noted that the mounting base 3 can be constructed as an independent component from the impeller housing 12 or the diffuser 13, and can be fixed to the component (i.e., the impeller housing 12 or the diffuser 13) where the ultrasonic generator 2 needs to be arranged by means of snap-fit, welding or other methods.

[0060] In some embodiments of this application, the mounting base 3 is provided with a mounting hole for accommodating the ultrasonic generator 2, and the peripheral wall of the mounting hole may be provided with a threaded hole that communicates and engages with the mounting hole. The fastener may be constructed as a fixing bolt, which may engage with the threaded hole to selectively screw into one side of the mounting hole or screw out to the side away from the mounting hole.

[0061] Understandably, when the fixing bolt is screwed toward the side of the central axis of the mounting hole, the fixing bolt can abut against the ultrasonic generator 2 arranged in the mounting hole, so as to fasten the ultrasonic generator 2 to the mounting base 3. The installation method is simple and highly reliable, and it is convenient to disassemble and replace the ultrasonic generator 2.

[0062] In some embodiments of this application, the mounting base 3 is provided with a mounting hole for accommodating at least part of the ultrasonic generator 2 and opening to one side of the compressor assembly 1 in the axial direction. The angle between the axial direction of the mounting hole and the central axis of the impeller 11 is α, and satisfies the relationship: 30°≤α≤60°.

[0063] It is understandable that the axial direction of the mounting hole is also the mounting direction of the ultrasonic generator 2. When the angle α between the axial direction of the mounting hole and the central axis of the impeller 11 satisfies the above relationship, the mounting direction of the ultrasonic generator 2 is tilted relative to the central axis of the impeller 11, so that the ultrasonic generator 2 can avoid other components in the compressor assembly 1 (such as components that overlap with the projection of the impeller 11 in the axial projection) during the installation process, thereby reducing the assembly difficulty of the ultrasonic generator 2.

[0064] In a further embodiment of this application, when multiple mounting bases 3 are provided, the mounting holes on the multiple mounting bases 3 can be opened to the same side, so that the ultrasonic generator 2 can be assembled from the same side of the compressor assembly 1.

[0065] In some embodiments of this application, the mounting base 3 may be made of a high-temperature resistant material (such as metal, alloy, etc.), and the surface of the mounting base 3 may be treated with a protective treatment (such as anti-corrosion treatment) to extend the durability and service life of the mounting base 3. The fastener may be made of stainless steel to give it good corrosion resistance.

[0066] In this application, since the ultrasonic generator can be assembled by a specific fixing device (i.e., the mounting base 3 and the fixing parts mentioned above), the stability and reliability of the ultrasonic waves under different working conditions can be effectively guaranteed. This can prevent the ultrasonic waves from failing due to changes in the working conditions of the centrifugal compressor system 100, and further improve the overall performance of the centrifugal compressor system 100.

[0067] In some embodiments of this application, there are multiple mounting bases 3, each mounting base 3 is provided with mounting holes for accommodating at least part of the ultrasonic generator 2, the axial direction of each mounting hole is intersected with the central axis of the impeller 11, and the angle between the axial direction of at least two mounting holes and the central axis of the impeller 11 is different.

[0068] It is understood that each mounting base 3 can be used to install one ultrasonic generator 2, the axial direction of the mounting hole is also the installation direction of the ultrasonic generator 2, and the angle between the axial direction of multiple mounting holes and the central axis of the impeller 11 can be different, so that the ultrasonic generator 2 can be assembled at the compressor assembly 1 at different installation angles, so as to effectively cover the circumferential range of the impeller 11 by multiple ultrasonic generators 2.

[0069] In some specific embodiments, taking the impeller casing 12 and diffuser 13 as an example, three ultrasonic generators are provided. The angles between the installation directions of the three ultrasonic generators 2 and the central axis of the impeller 11 are 30°, 45° and 60°, respectively, so that the three ultrasonic generators 2 can effectively cover the entire circumferential range of the impeller 11.

[0070] In some embodiments of this application, a first through hole is provided on the wall of the impeller casing 12. The first through hole is used to accommodate and install the ultrasonic generator 2, so that the ultrasonic generator 2 can be directly arranged at the impeller casing 12 to shorten the transmission distance of the ultrasonic wave, so that the ultrasonic wave output by the ultrasonic generator 2 can directly act on the impeller casing 12.

[0071] In some embodiments of this application, the diffuser 13 is provided with a second through hole for accommodating and installing the ultrasonic generator 2, so that the ultrasonic generator 2 can be directly arranged at the diffuser 13 to shorten the transmission distance of the ultrasonic wave, so that the ultrasonic wave output by the ultrasonic generator 2 can directly act on the diffuser 13.

[0072] In some embodiments of this application, the impeller housing 12 is provided with a first receiving groove for accommodating the ultrasonic generator 2, so that the ultrasonic generator 2 can be directly arranged at the impeller housing 12 to shorten the transmission distance of the ultrasonic wave, so that the ultrasonic wave output by the ultrasonic generator 2 can directly act on the impeller housing 12.

[0073] In some embodiments of this application, the diffuser 13 is provided with a second receiving groove for accommodating the ultrasonic generator 2, so that the ultrasonic generator 2 can be directly arranged at the diffuser 13 to shorten the transmission distance of the ultrasonic wave, so that the ultrasonic wave output by the ultrasonic generator 2 can directly act on the diffuser 13.

[0074] It should be noted that the receiving groove structure (i.e., the first receiving groove and the second receiving groove mentioned above) is a semi-closed structure compared to the through hole structure (i.e., the first through hole and the second through hole mentioned above). That is, the receiving groove structure can be opened to one side so that the ultrasonic generator 2 can be installed from the open side of the receiving groove structure. At the same time, the ultrasonic generator 2 can be fixed in the receiving groove structure or the through hole structure by interference fit.

[0075] In some embodiments, the openings of the receiving groove structure and the through hole structure can be configured to face the working fluid flow channel of the compressor assembly 1, so that the ultrasonic generator 2 can directly contact the gas and improve the effect of ultrasonic waves on the working fluid gas.

[0076] It should be noted that the ultrasonic generator 2 needs to be arranged inside the receiving groove structure and the through hole structure to avoid the ultrasonic generator 2 being exposed and affecting the flow of the working gas. In other words, the ultrasonic generator 2 will not be exposed from the receiving groove structure and the through hole structure and extend into the working gas channel, thereby ensuring the assembly reliability of the ultrasonic generator 2 while shortening the ultrasonic transmission distance and saving parts.

[0077] In some embodiments of this application, the position of the diffuser 13 relative to the volute 14 and the impeller casing 12 is fixed to ensure the assembly reliability of the diffuser 13 in the compressor assembly 1.

[0078] The diffuser 13 can be fastened using connectors (such as bolts, screws, pins, etc.) or engaging with the mounting carrier using snap-fit ​​structures (such as snap-fit ​​protrusions, snap-fit ​​grooves, etc.). It should be noted that in the centrifugal compressor system 100, the volute 14 and other shell components within the centrifugal compressor system 100 can all serve as mounting carriers for the diffuser 13. The specific installation method of the diffuser 13 is not limited here; it is sufficient to ensure that the diffuser 13 is fixed in position to the volute 14 and impeller casing 12.

[0079] In one specific embodiment of this application, the centrifugal compressor system 100 includes at least an impeller 11, an impeller housing 12, a diffuser 13, and a volute 14. The ultrasonic generator, as a topology component, is assembled and fixed on the barometer assembly by a fixing device (such as a mounting base 3 and a fastener).

[0080] Meanwhile, the ultrasonic generator 2 employs a piezoelectric ceramic oscillating device and is capable of generating ultrasonic waves at a frequency of 40kHz with an output power density of 0.5W / cm². It should be noted that the ultrasonic generator 2 can be constructed as a fixed-frequency ultrasonic generator, an adjustable-frequency ultrasonic generator, a dual-frequency or multi-frequency ultrasonic generator, etc. The specific category of the ultrasonic generator 2 is not limited here.

[0081] It should be noted that the centrifugal compressor system 100 according to the embodiments of this application can be used in air compressors, heat exchange equipment (such as air conditioning equipment, etc.). Furthermore, when the centrifugal compressor system 100 is applied to heat exchange equipment and air compressors respectively, the type of working gas in the centrifugal compressor system 100 can be different, and no specific limitation is made here.

[0082] The centrifugal compressor system 100 according to the embodiments of this application has at least the following advantages over the prior art: (1) The centrifugal compressor system 100 uses ultrasonic waves to vibrate and mix the working gas in the system, so that the low-energy fluid in the boundary layer can continuously obtain energy injection from the fluid in the mainstream region, thereby increasing the kinetic energy of the boundary layer and the turbulent kinetic energy of the mainstream region, thus delaying separation, delaying the occurrence of surge, increasing the surge margin, and increasing the maximum load that the blades in the diffuser 13 can withstand, thereby improving the centrifugal efficiency. (2) The centrifugal compressor system 100 can effectively delay the occurrence of surge under low flow conditions, increase the surge margin, significantly improve the working range and adaptability of the compressor, and enable the compressor to maintain stable operation under a wider range of working conditions; (3) The ultrasonic generator 2 is fixed in the compressor assembly 1 in a flexible and easy way, which can adapt to centrifugal compressors of various models and specifications, and has good versatility and practicality.

[0083] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0085] In the description of this invention, "a plurality of" means two or more.

[0086] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0087] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A centrifugal compressor system, characterized in that, include: A compressor assembly, comprising an impeller, an impeller casing, a diffuser, and a volute, wherein the impeller is disposed in the impeller casing, the diffuser is disposed at the outlet of the impeller, and the volute is connected to the impeller casing and disposed at the outlet side of the diffuser. At least one ultrasonic generator is fixed to at least one of the impeller housing and the diffuser.

2. The centrifugal compressor system according to claim 1, characterized in that, The ultrasonic generator includes a first ultrasonic generator, which is disposed on the impeller casing and located on the circumferential outer side of the impeller.

3. The centrifugal compressor system according to claim 2, characterized in that, There are multiple first ultrasonic generators, and the multiple first ultrasonic generators are arranged at intervals along the circumferential direction of the impeller casing.

4. The centrifugal compressor system according to claim 2, characterized in that, The ultrasonic generator includes a second ultrasonic generator, which is disposed in the diffuser and located circumferentially outside the impeller casing.

5. The centrifugal compressor system according to claim 4, characterized in that, There are multiple second ultrasonic generators, which are arranged at intervals along the circumferential direction of the diffuser.

6. The centrifugal compressor system according to claim 4, characterized in that, In the axial projection of the compressor assembly, the central axes of the first ultrasonic generator, the second ultrasonic generator, and the impeller are arranged non-collinearly.

7. The centrifugal compressor system according to claim 1, characterized in that, The compressor assembly also includes: Mounting base, which is disposed on the impeller housing or the diffuser and is used to arrange the ultrasonic generator; A fastener is provided on the mounting base and is used to fix the ultrasonic generator to the mounting base.

8. The centrifugal compressor system according to claim 7, characterized in that, The mounting base is provided with a mounting hole for accommodating at least part of the ultrasonic generator and opening to one side of the compressor assembly in the axial direction. The angle between the axial direction of the mounting hole and the central axis of the impeller is α, and satisfies the relationship: 30°≤α≤60°.

9. The centrifugal compressor system according to claim 7, characterized in that, There are multiple mounting bases, each of which has a mounting hole for accommodating at least a portion of the ultrasonic generator. The axial direction of each mounting hole intersects the central axis of the impeller, and the angle between the axial direction of at least two mounting holes and the central axis of the impeller is different.

10. The centrifugal compressor system according to claim 1, characterized in that, The impeller casing has a first through hole on its wall surface, which is used to accommodate and install the ultrasonic generator. And / or, the diffuser is provided with a second through hole for receiving and mounting the ultrasonic generator; And / or, the impeller housing is provided with a first receiving groove for receiving the ultrasonic generator; And / or, the diffuser is provided with a second receiving slot for receiving the ultrasonic generator.

11. The centrifugal compressor system according to claim 1, characterized in that, The ultrasonic generator's ultrasonic output power is not less than 0.1 W / cm². 2 ; And / or, the ultrasonic frequency output by the ultrasonic generator is in the range of 20kHz-100kHz.

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