Centrifugal compressor and measuring device

Abstract

To provide a centrifugal compressor capable of comprehensively analyzing the internal fluid characteristics of the centrifugal compressor and analyzing an optimization strategy for the overall performance. The centrifugal compressor includes an inlet passage 1, a guide vane assembly 2, an impeller assembly 3, a vaned diffuser 4, a vaneless diffuser 5, a volute casing assembly 6, and an outlet passage 7. Measurement surfaces are provided at the inlet of the inlet passage, the inlet and outlet of the guide vane assembly, between the inlet and outlet of the impeller assembly, between the impeller assembly and the vaned diffuser, between the inlet and outlet of the vaned diffuser, between the inlet and outlet of the vaneless diffuser, and at the outlet of the outlet passage. By analyzing multiple measurement surfaces, flow parameters and environmental parameters of the working fluid at predetermined positions can be obtained, allowing for a comprehensive analysis of the internal fluid characteristics of the centrifugal compressor and an optimization strategy for its overall performance.

Description

[Technical Field]

[0001] The present invention relates to the technical field of compressors, and more particularly to centrifugal compressors and measuring devices. [Background technology]

[0002] The centrifugal compressor is a core component of the new pressure storage system (which uses air, carbon dioxide gas, nitrogen gas, etc. as the working fluid). The external characteristics and internal flow characteristics of the entire unit have a significant impact on parameters such as the overall unit efficiency, pressure ratio, and variable operating condition range.

[0003] Conventional centrifugal compressor measurements are generally performed by placing measurement points at the inlet and outlet of the entire compressor, obtaining the aerodynamic parameters of the inlet and outlet under different operating conditions, and then analyzing the overall performance of the centrifugal compressor. However, the above measurement method only analyzes the overall performance of the centrifugal compressor through the aerodynamic parameters of the inlet and outlet, making it difficult to deeply study the internal flow mechanism and optimization route of the centrifugal compressor. At the same time, most of the conventional measurement methods are basic industrial performance external characteristic measurements, and are unable to deeply study the internal flow mechanism. Furthermore, they are unable to perform the entire pass-through area of ​​the entire compressor, the combined adjustment of variable operating conditions, the measurement of all operating conditions, and the measurement of the entire flow field, making it difficult to further efficiently optimize the design and perform highly accurate performance prediction. Summary of the Invention [Means for solving the problem]

[0004] In view of the above problems, the present invention is an inlet passage; a guide vane assembly disposed in the inlet passage; an impeller assembly disposed downstream of the guide vane assembly; a vaned diffuser disposed downstream of the impeller assembly; a vaneless diffuser disposed downstream of the vaned diffuser; a volute casing assembly located downstream of the vaneless diffuser; an outflow passage provided downstream of the volute casing assembly, Measurement surfaces are provided at the inlet of the inflow passage, the inlet and outlet of the guide vane assembly, between the inlet and outlet of the impeller assembly, between the impeller assembly and the vaned diffuser, between the inlet and outlet of the vaned diffuser, between the inlet and outlet of the vaneless diffuser, and at the outlet of the outflow passage.

[0005] In some specific embodiments, the measurement surface includes a first measurement surface, and a plurality of first measurement points are provided on an inlet cross section of the inlet passage; one of the first measurement points is provided at a center of an inlet cross section of the inlet passage, and the remaining first measurement points are provided at intervals along a circumferential direction and a radial direction about the center of the inlet cross section of the inlet passage; the first measurement points are located on the same plane to form the first measurement surface; the plurality of first measurement points located on the same circumference are uniformly distributed and provided to surround the same circular region, and the difference in area between any two adjacent circular regions along the radial direction of the inlet cross section of the inlet passage is equal; the number of the first measurement points provided on each circumference is equal, and the first measurement points on each circumference are provided in one-to-one correspondence; The plurality of first measurement points located on the same diameter are fixed together by a first bracket, and the first bracket is inserted or penetrated into the inlet passage along the radial direction.

[0006] In some specific embodiments, an inlet guide vane gap is provided between the guide vane assembly and an inner wall of the inlet passage; the measurement surface further includes a second measurement surface, a plurality of second measurement point groups are provided along a circumferential direction of the inlet guide vane gap, each group includes a plurality of the second measurement points, and the plurality of second measurement points in each group are located on the same plane to form the second measurement surface; The guide vane assembly includes a plurality of inlet guide vanes, and the second measurement points in each group are provided on a chord line of an end face of each of the inlet guide vanes facing the inner wall of the inlet passage.

[0007] In some specific embodiments, the guide vane assembly includes a plurality of inlet guide vanes, the plurality of inlet guide vanes defining a central mating gap toward a center of the inlet passage; the measurement surface further includes a third measurement surface, a plurality of third measurement point groups are provided along a circumferential direction of the central fitting gap, each group includes a plurality of the third measurement points, and the plurality of third measurement points in each group are located on the same plane to form the third measurement surface; The third measurement points in each group are provided on the chord line of the end face of the inlet guide vane toward the center of the inlet passage.

[0008] In some specific embodiments, the measurement surface further includes a fourth measurement surface, and a plurality of fourth measurement points are provided at intermediate positions between the guide vane assembly and the impeller assembly; the plurality of fourth measurement points are located on the same plane to form the fourth measurement surface; A plurality of the fourth measurement points are spaced circumferentially along the inlet passage at intermediate locations between the guide vane assembly and the impeller assembly.

[0009] In some specific embodiments, the measurement surface further includes a fifth measurement surface, and a plurality of fifth measurement points are provided between the inlet and the outlet of the impeller assembly; the fifth measurement points are spaced apart along a flow direction of the working fluid, and the fifth measurement points are positioned on the same plane to form the fifth measurement surface; The impeller assembly includes: an impeller cover connected to the inlet passage and the vaned diffuser; an impeller rotatably provided inside the impeller cover, the impeller having a tip gap between the circumferential direction of the impeller and an inner wall of the impeller cover; the plurality of fifth measurement points are provided at intervals on the impeller cover along the flow direction of the working fluid, The impeller cover is provided so as to gradually widen along the flow direction of the working fluid, The difference in the projected areas of the circumferential surfaces on which any two adjacent fifth measurement points are located in a direction perpendicular to the flow direction of the working fluid in the inflow passage is equal, a disk cavity is provided between the impeller on a side remote from the guide vane assembly and the impeller cover; the measurement surface further includes a sixth measurement surface, a plurality of sixth measurement points are spaced apart along the circumferential direction and the radial direction of the disk cavity, and the sixth measurement points are located on the same plane to form the sixth measurement surface; The sixth measurement points located on the same circumference are arranged to surround each other to form a circular area, and the difference in area between any two adjacent circular areas along the radial direction of the disk cavity is equal.

[0010] In some specific embodiments, the vaned diffuser includes a booster chamber and a plurality of booster vanes circumferentially spaced apart within the booster chamber, with a plurality of booster passages formed between the plurality of booster vanes; the measurement surface further includes a seventh measurement surface, a dynamic / static fitting gap is provided between the impeller assembly and the vaned diffuser, a plurality of seventh measurement point groups are provided at intervals along a circumferential direction of the dynamic / static fitting gap, the plurality of seventh measurement point groups are provided in one-to-one correspondence with the plurality of pressure boosting passages, each group includes a plurality of seventh measurement points, and the plurality of seventh measurement points in the plurality of groups are located on the same plane to form the seventh measurement surface; The seventh measurement points in each group are spaced apart in the dynamic and static fitting gap along the flow direction of the working fluid.

[0011] In some specific embodiments, the vaned diffuser includes a booster chamber and a plurality of booster vanes circumferentially spaced apart within the booster chamber, with a plurality of booster passages formed between the plurality of booster vanes; the measurement surface further includes an eighth measurement surface, and each of the pressure-increasing passages is provided with at least one eighth measurement point group, each group including a plurality of the eighth measurement points, and the plurality of eighth measurement points in the plurality of groups are located on the same plane to form the eighth measurement surface; The eighth measurement points in each group are spaced apart in the pressure boosting passage along the flow direction of the working fluid.

[0012] In some specific embodiments, the vaned diffuser includes a booster chamber and a plurality of booster vanes circumferentially spaced apart within the booster chamber, with a diffuser gap between the booster vanes and an inner wall of the booster chamber; the measurement surface further includes a ninth measurement surface, a plurality of ninth measurement point groups are provided along a circumferential direction of the diffuser gap, each group includes a plurality of ninth measurement points, and the plurality of ninth measurement points in each group are located on the same plane to form the ninth measurement surface; The plurality of ninth measurement points in each group are provided on the chord line of the end surface of the intensifier vane facing the inner wall of the intensifier chamber.

[0013] In some specific embodiments, the vaned diffuser includes a booster chamber and a plurality of booster vanes circumferentially spaced apart within the booster chamber, with a plurality of booster passages formed between the plurality of booster vanes; the measurement surface further includes a tenth measurement surface; a plurality of tenth measurement point groups are provided at intervals along the circumferential direction of the vaneless diffuser, the plurality of tenth measurement point groups and the plurality of pressure booster passages are provided in one-to-one correspondence, each group includes a plurality of the tenth measurement points, and the plurality of tenth measurement points in each group are located on the same plane to form the tenth measurement surface; The tenth measurement points in each group are spaced apart on the vaneless diffuser along the direction of flow of the working fluid.

[0014] In some specific embodiments, the measurement surface further includes an eleventh measurement surface, and a plurality of eleventh measurement points are provided on the outlet cross section of the outflow passage; One of the eleven measurement points is provided at the center of the outlet cross section of the outflow passage, and the remaining eleven measurement points are provided at intervals along the circumferential direction and the radial direction of the center of the outlet cross section of the outflow passage, the eleventh measurement points are located on the same plane to form the eleventh measurement surface; the eleventh measurement points located on the same circumference are uniformly distributed and arranged to surround a circular region, and the difference in area between any two adjacent circular regions along the radial direction of the outlet cross section of the outflow passage is equal; the number of the eleventh measurement points provided on each circumference is equal, and the eleventh measurement points on each circumference are provided in one-to-one correspondence; The plurality of eleventh measurement points positioned on the same diameter are fixed together by a second bracket, and the second bracket is inserted or penetrated into the outflow passage along the radial direction.

[0015] A measuring device based on the same concept includes a detection sensor and a centrifugal compressor as described in any of the above specific embodiments, The detection sensors are provided on the respective measurement surfaces of the centrifugal compressor.

[0016] Compared with the prior art, the centrifugal compressor of the present invention has at least the following advantages: Measuring surfaces are provided at the inlet of the inlet passage, the inlet and outlet of the guide vane assembly, between the inlet and outlet of the impeller assembly, between the impeller assembly and the vaned diffuser, between the inlet and outlet of the vaned diffuser, between the inlet and outlet of the vaneless diffuser, and at the outlet of the outflow passage, respectively, so that the flow parameters and environmental parameters of the working fluid at each predetermined position can be analyzed and obtained, and the internal fluid characteristics of the centrifugal compressor can be comprehensively analyzed, and a strategy for optimizing the overall performance of the compressor can be obtained. The changes in the fluid characteristics at the inlet and outlet of the entire centrifugal compressor and at each internal subcomponent are taken into account, which improves the accuracy and comprehensiveness of the measurement results.

[0017] The measuring device of the present invention includes the centrifugal compressor described above and has the same beneficial effects as the centrifugal compressor described above, so a description thereof will be omitted here.

[0018] Additional features and advantages of the invention will be set forth in the description that follows, and in part these advantages will be obvious from the description or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and obtained through the structure particularly pointed out in the description and drawings. [Brief explanation of the drawings]

[0019] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the drawings that need to be used in the description of the embodiments or the prior art are briefly described below. Obviously, the drawings in the following description are some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

[0020] [Figure 1] FIG. 1 is a cross-sectional view of a centrifugal compressor according to an embodiment of the present invention. [Figure 2] FIG. 2 shows a schematic diagram of an axial structure extending inwardly along the inlet of the inlet passage in an embodiment of the present invention. [Figure 3]FIG. 3 shows a schematic diagram of the arrangement of the first measurement points in an embodiment of the present invention. [Figure 4] FIG. 4 shows a schematic diagram of the arrangement of the second measurement points in an embodiment of the present invention. [Figure 5] FIG. 5 shows a schematic diagram of the arrangement of the third measurement points in an embodiment of the present invention. [Figure 6] FIG. 6 shows a schematic diagram of the arrangement of the fourth measurement point in an embodiment of the present invention. [Figure 7] FIG. 7 shows a schematic diagram of the arrangement of the fifth and sixth measurement points in an embodiment of the present invention. [Figure 8] FIG. 8 shows a schematic diagram of the arrangement of the seventh, eighth and tenth measurement points in an embodiment of the present invention. [Figure 9] FIG. 9 shows a schematic diagram of the arrangement of the ninth measurement point in an embodiment of the present invention. [Figure 10] FIG. 10 shows a schematic diagram of the arrangement of the eleventh measurement point in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0022] As shown in Figures 1 and 2, the present invention provides a centrifugal compressor including an inlet passage 1, a guide vane assembly 2, an impeller assembly 3, a vaned diffuser 4, a vaneless diffuser 5, a volute casing assembly 6, and an outlet passage 7. The inlet passage 1 is used to input a working fluid. The guide vane assembly 2 is provided in the inlet passage 1. The impeller assembly 3 is provided downstream of the guide vane assembly 2 and is used to dynamically increase the pressure of the working fluid flowing into the inlet passage 1. The vaned diffuser 4 is provided downstream of the impeller assembly 3 and is used to statically decelerate and increase the pressure of the working fluid from the impeller assembly 3. The vaneless diffuser 5 is provided downstream of the vaned diffuser 4 and can further statically decelerate and increase the pressure of the working fluid from the vaned diffuser 4. The volute casing assembly 6 is provided downstream of the vaneless diffuser 5 and can further statically decelerate and increase the pressure of the working fluid from the vaneless diffuser 5. The outlet passage 7 is provided downstream of the volute casing assembly 6 and is used to output the working fluid. Measuring surfaces are provided at the inlet of the inlet passage 1, the inlet and outlet of the guide vane assembly 2, between the inlet and outlet of the impeller assembly 3, between the impeller assembly 3 and the vaned diffuser 4, between the inlet and outlet of the vaned diffuser 4, between the inlet and outlet of the vaneless diffuser 5, and at the outlet of the outlet passage 7, respectively.

[0023] The centrifugal compressor has measurement surfaces at the inlet of the inlet passage 1, the inlet and outlet of the guide vane assembly 2, between the inlet and outlet of the impeller assembly 3, between the impeller assembly 3 and the vaned diffuser 4, between the inlet and outlet of the vaned diffuser 4, between the inlet and outlet of the vaneless diffuser 5, and the outlet of the outlet passage 7. The measurement surfaces are used to analyze and obtain the flow parameters and environmental parameters of the working fluid at each preset position. By analyzing the obtained flow parameters and environmental parameters at each preset position, the internal fluid characteristics of the centrifugal compressor can be comprehensively analyzed and a strategy for optimizing its overall performance can be developed. By taking into account the changes in the fluid characteristics at the inlet and outlet of the entire centrifugal compressor and at each internal subcomponent, the overall performance and internal energy loss of the centrifugal compressor can be obtained by analyzing the fluid characteristics at the inlet and outlet of the entire centrifugal compressor and at each internal subcomponent, thereby improving the accuracy and comprehensiveness of the measurement results.

[0024] This new pressure storage system has potential advantages, including geographical independency, large single-stage capacity, high energy storage efficiency, a long life cycle, waste heat recovery, the ability to combine wind and solar power complementarity, and suitability for new power systems in deserts, barren lands, and deep seas. It is therefore considered a large-scale physical energy storage technology with great prospects for development. The centrifugal compressor converts the electrical energy to be stored into the internal energy and pressure potential energy of the working fluid. Its energy conversion efficiency directly affects the overall efficiency and energy storage economics of the new pressure storage system. As the core component of the multi-stage centrifugal or axial-centrifugal compressors commonly used in new pressure storage systems, the centrifugal compressor's throughflow performance has a significant impact on the overall efficiency, pressure ratio, and variable operating condition range of the entire system. Therefore, efficient, accurate, and reliable measurement and analysis methods play a key role in optimizing the centrifugal compressor design.

[0025] Centrifugal compressor design must be based on a deep understanding of the aerodynamic characteristics and internal flow mechanisms of a single-stage centrifugal compressor (modeling stage). Experimental data from a high-efficiency modeling stage with a certain number of different flow coefficients must be accumulated to select the appropriate compressor stage for each stage of the centrifugal compressor. Full-body internal flow measurements of typical aerodynamic performance must be conducted to accumulate a valuable real-world database, and the internal flow field mechanisms must be analyzed to lead to more efficient design optimization and highly accurate performance prediction. Currently disclosed literature and technology contain very few internal flow measurement methods and results for centrifugal compressors, most of which are basic industrial performance external characteristic measurements. There is little detailed research on the internal flow mechanisms at the scientific research level. Furthermore, there are no systematic measurements that cover the entire flow area of ​​the entire machine, combine variable operating conditions, measure all operating conditions, or measure the entire flow field.

[0026] 3 , in some specific embodiments of the present invention, the measurement surface includes a first measurement surface, and a plurality of first measurement points 100 are provided on the inlet cross section of the inlet passage 1. One of the first measurement points 100 is provided at the center of the inlet cross section of the inlet passage 1, and the remaining first measurement points 100 are provided at intervals along the circumferential direction and the radial direction of the center of the inlet cross section of the inlet passage 1. The plurality of first measurement points 100 are located on the same plane to form the first measurement surface. The first measurement point 100 is used to detect and obtain flow parameters and environmental parameters of the working fluid at the inlet of the inlet passage 1.

[0027] By arranging a plurality of first measurement points 100 on the inlet cross section of the inlet passage 1, the plurality of first measurement points 100 are located on the same plane to form a first measurement plane, one of the first measurement points 100 is provided at the center of the inlet cross section of the inlet passage 1, and the remaining first measurement points 100 are provided at intervals along the circumferential and radial directions around the center of the inlet cross section. This makes it possible to detect the working fluid at a plurality of positions around the center, radial and circumferential directions of the inlet of the inlet passage 1 and obtain flow parameters and environmental parameters of the working fluid at various positions around the inlet of the inlet of the inlet passage 1. The plurality of first measurement points 100 allows for obtaining multiple sets of data, improving detection accuracy.

[0028] In some specific embodiments of the present invention, the multiple first measurement points 100 located on the same circumference are evenly distributed and arranged to form a surrounding circular area, and the difference in area between any two adjacent circular areas in the radial direction of the inlet cross section of the inlet passage 1 is equal.

[0029] When arranging multiple first measurement points 100 on the inlet cross section, the "equal area method" is adopted to evenly distribute multiple first measurement points 100 on the inlet cross section of the inlet passage 1, represent a surface with multiple points, and obtain performance parameters of the working fluid at various positions at the inlet of the inlet passage 1, making the measurement data more comprehensive and accurate.

[0030] In some specific embodiments of the present invention, the number of first measurement points 100 provided on each circumference is equal, and the first measurement points 100 on each circumference are provided in one-to-one correspondence. The multiple first measurement points 100 located on the same diameter are fixed together by a first bracket, and the first bracket is inserted into or penetrates the inlet passage 1 along the radial direction.

[0031] The above arrangement makes it possible to easily fix multiple first measurement points 100. By fixing multiple first measurement points 100 located on the same diameter together via the same bracket, the number of brackets can be reduced, and it is possible to avoid the occurrence of resistance to the flow of the working fluid due to the use of too many brackets.

[0032] At the same time, in this embodiment, four first measurement points 100 are evenly distributed on each circumference, and eleven first measurement points 100 are distributed on the same diameter, for a total of 21 (4 x 5 + 1 = 21) first measurement points 100, but this is not limiting. In other embodiments, the number of first measurement points 100 can be adjusted as needed.

[0033] 4, in some specific embodiments of the present invention, an inlet guide vane gap 10 is provided between the guide vane assembly 2 and the inner wall of the inlet passage 1. The measurement surface further includes a second measurement surface, and a plurality of groups of second measurement points 200 are provided along the circumferential direction of the inlet guide vane gap 10, each group including a plurality of second measurement points 200, and the plurality of second measurement points 200 in each group are located on the same plane to form the second measurement surface. The plurality of second measurement points 200 are used to detect and obtain flow parameters and environmental parameters of the working fluid in the inlet guide vane gap 10.

[0034] A group of multiple second measurement points 200 is provided in the circumferential direction of the inlet guide vane gap 10. The group of multiple second measurement points 200 can detect the working fluid flowing at various positions in the circumferential direction of the inlet guide vane gap 10, thereby obtaining the flow parameters and environmental parameters of the working fluid in the guide vane gap and realizing the performance analysis of the inlet guide vane gap 10.

[0035] In some specific embodiments of the present invention, the guide vane assembly 2 includes a plurality of inlet guide vanes 21, and a plurality of second measurement points 200 in each group are provided on the chord line of the end face of each inlet guide vane 21 facing the inner wall of the inlet passage 1.

[0036] By locating the second measurement points 200 in each group on the chord line of the end face of each inlet guide vane 21 facing the inner wall of the inlet passage 1, it becomes possible to rotate the second measurement points 200 adaptively following the rotation of the inlet guide vane 21, so that the second measurement points 200 can always detect the working fluid in the inlet guide vane gap 10. On the other hand, by locating the second measurement points 200 on the chord line of the end face of the inlet guide vane 21 facing the inner wall of the inlet passage 1, it is possible to improve the detection accuracy.

[0037] If the second measurement point 200 is provided on the inner wall of the inlet passage 1, when the inlet guide vane 21 rotates, the second measurement point 200 may be misaligned with the inlet guide vane 21, making accurate detection impossible.

[0038] The line connecting the leading edge and trailing edge of the end face of the inlet guide vane 21 facing the inner wall of the inlet passage 1 is the chord line of the end face of the inlet guide vane 21 facing the inner wall of the inlet passage 1. The number of groups of second measurement points 200 is equal to the number of inlet guide vanes 21, i.e., one group of second measurement points 200 is provided for each inlet guide vane 21. In this embodiment, 2N (N is a positive integer) second measurement points 200 are provided in each group, and the 2N second measurement points 200 are evenly divided along the chord line of the end face of the inlet guide vane 21 facing the inner wall of the inlet passage 1. For example, four (N is 2) second measurement points 200 can be provided in each group. Of course, in other embodiments, the number of second measurement points 200 can be adjusted as necessary and is not limited to this embodiment.

[0039] 5 , in some specific embodiments of the present invention, the guide vane assembly 2 includes a plurality of inlet guide vanes 21, which form a central fitting gap 20 toward the center of the inlet passage 1. The measurement surface further includes a third measurement surface, and a plurality of groups of third measurement points 300 are arranged along the circumferential direction of the central fitting gap 20, each group including a plurality of third measurement points 300, and the plurality of third measurement points 300 in each group are located on the same plane to form the third measurement surface. The plurality of second measurement points 300 are used to detect and obtain flow parameters and environmental parameters of the working fluid in the central fitting gap 20.

[0040] A group of third measurement points 300 is provided around the central fitting gap 20 in the circumferential direction. The group of third measurement points 300 can detect the working fluid flowing at various positions around the central fitting gap 20, thereby obtaining the flow parameters and environmental parameters of the working fluid in the central fitting gap and realizing performance analysis of the central fitting gap 20.

[0041] In some specific embodiments of the present invention, the plurality of third measurement points 300 in each group are located on the chord line of the end face of the inlet guide vane 21 toward the center of the inlet passage 1 .

[0042] The third measurement points 300 are placed in each group on the end face of each inlet guide vane 21 facing the center of the inlet passage 1, and the third measurement points 300 are arranged so that they rotate adaptively in accordance with the rotation of the inlet guide vane 21. This enables the third measurement points 300 to constantly detect the working fluid in the central fitting gap 20, improving detection accuracy.

[0043] The line connecting the leading edge and trailing edge of the end face of the inlet guide vane 21 facing the center of the inlet passage 1 is the chord line of the end face of the inlet guide vane 21 facing the center of the inlet passage 1. The number of groups of third measurement points 300 is equal to the number of inlet guide vanes 21, i.e., one group of third measurement points 300 is provided for each inlet guide vane 21. In this embodiment, each group is provided with 2N (N is a positive integer) third measurement points 300, and the 2N third measurement points 300 are evenly divided along the chord line of the end face of the inlet guide vane 21 facing the center of the inlet passage 1. For example, each group can be provided with four (N is 2) third measurement points 300. Of course, in other embodiments, the number of third measurement points 300 can be adjusted as necessary and is not limited to this embodiment.

[0044] 6, in some specific embodiments of the present invention, the measurement surface further includes a fourth measurement surface, and a plurality of fourth measurement points 400 are provided at an intermediate position between the guide vane assembly 2 and the impeller assembly 3. The plurality of fourth measurement points 400 are located on the same plane to form the fourth measurement surface. The group of the plurality of fourth measurement points 400 is used to detect and obtain flow parameters and environmental parameters of the working fluid at the outlet of the guide vane assembly 2.

[0045] The multiple fourth measurement points 400 are arranged at intermediate positions in the distance between the guide vane assembly 2 and the impeller assembly 3, thereby detecting the working fluid flowing out from the outlet of the guide vane assembly 2 and avoiding the drive structure of the guide vane assembly 2, so that the arrangement of the fourth measurement points 400 does not affect the adjustment of the guide vane assembly 2.

[0046] In some specific embodiments of the present invention, the plurality of fourth measurement points 400 are spaced circumferentially along the inlet passage 1 at intermediate positions between the guide vane assembly 2 and the impeller assembly 3.

[0047] By providing multiple fourth measurement points 400 at intervals in the circumferential direction of the inlet passage 1 at the midpoint of the distance between the guide vane assembly 2 and the impeller assembly 3, the working fluid flowing out from various positions in the circumferential direction of the outlet of the guide vane assembly 2 can be detected, resulting in more comprehensive and accurate detection data. In this embodiment, taking into consideration both installation cost and detection accuracy, five fourth measurement points 400 may be provided at intervals of one-fourth of the circumference of the inlet passage 1. However, this is not a limitation. In other embodiments, the number of fourth measurement points 400 can be designed as needed.

[0048] In some specific embodiments of the present invention, the measurement surface further includes a fifth measurement surface, and a plurality of fifth measurement points 500 are provided between the inlet and the outlet of the impeller assembly 3. The plurality of fifth measurement points 500 are provided at intervals along the flow direction of the working fluid, and the plurality of fifth measurement points 500 are located on the same plane to form the fifth measurement surface.

[0049] A plurality of fifth measurement points 500 spaced apart along the flow direction of the working fluid can detect the working fluid flowing inside the impeller assembly 3 and obtain the fluid performance of the impeller assembly 3.

[0050] In some specific embodiments of the present invention, the impeller assembly 3 includes an impeller cover and an impeller 31. The impeller cover is connected to the inlet passage 1 and the vaned diffuser 4. The impeller 31 is rotatably mounted inside the impeller cover, and a tip gap 30 is provided between the circumferential direction of the impeller 31 and the inner wall of the impeller cover. A plurality of fifth measurement points 500 are provided on the impeller cover at intervals along the flow direction of the working fluid. The group of fifth measurement points 500 is used to detect and obtain flow parameters and environmental parameters of the working fluid in the tip gap 30.

[0051] The rotation of the impeller 31 generates negative pressure, and the working fluid passes through the impeller 31 and flows into the vaned diffuser 4. A tip gap 30 is provided between the impeller 31 and the inner wall of the impeller cover, and a plurality of fifth measurement points 500 detect the working fluid passing through the tip gap 30, allowing the performance of the fluid in the tip gap 30 to be analyzed.

[0052] In some specific embodiments of the present invention, the impeller cover is configured to gradually widen along the flow direction of the working fluid, and the difference in the projected area of ​​the circumferential surface where any two adjacent fifth measurement points 500 are located in the direction perpendicular to the flow direction of the working fluid in the inlet passage 1 is equal.

[0053] When arranging the fifth measurement points 500, the "equal area method" is used, i.e., the method in which the difference in projected area of ​​the circumferential surface on which any two adjacent fifth measurement points 500 are located is equal in the direction perpendicular to the flow direction of the working fluid in the fluid passage 1. This allows the fifth measurement points 500 to be distributed evenly and rationally in the blade tip gap 30, improving the accuracy of the measurement data. In this embodiment, eight fifth measurement points 500 are provided at intervals along the flow direction of the working fluid, but this is not limited to this. In other embodiments, the number of fifth measurement points 500 can be designed as needed.

[0054] 7, in some specific embodiments of the present invention, a disk cavity 40 is provided between the side of the impeller 31 away from the guide vane assembly 2 and the impeller cover. The measurement surface further includes a sixth measurement surface, and a plurality of sixth measurement points 600 are provided at intervals along the circumferential and radial directions of the disk cavity 40, and the plurality of sixth measurement points 600 are located on the same plane to form the sixth measurement surface. The plurality of sixth measurement points 600 are used to detect and obtain flow parameters and environmental parameters of the working fluid in the tip gap 40.

[0055] A plurality of sixth measurement points 600 are spaced along the circumferential and radial directions of the disk cavity 40 to detect the working fluid at various circumferential and radial positions of the disk cavity and analyze the fluid characteristics of the disk cavity 40.

[0056] In some specific embodiments of the present invention, multiple sixth measurement points 600 located on the same circumference are arranged to form a circular area, and the difference in area between any two adjacent circular areas along the radial direction of the disk cavity 40 is equal.

[0057] When arranging the sixth measurement points 600 in the disk cavity 40, the "equal area method" is used to distribute the sixth measurement points 600 evenly across the disk cavity 40, representing a surface with multiple points. This allows for obtaining performance parameters of the working fluid at various positions in the disk cavity 40, making the measurement data more comprehensive and accurate. In this embodiment, eight circles are provided radially from the inside to the outside, and two sixth measurement points 600 are provided on the same circle, for a total of 16 (2 × 8 = 16) sixth measurement points 600, but this is not limited to this. In other embodiments, the number of sixth measurement points 600 can be set as needed.

[0058] 8 , in some specific embodiments of the present invention, the vaned diffuser 4 includes a booster chamber and a plurality of booster vanes 41 circumferentially spaced apart within the booster chamber, with a plurality of booster passages 42 formed between the plurality of booster vanes 41. The measurement surface further includes a seventh measurement surface, where a dynamic-static fitting gap 50 is defined between the impeller assembly 3 and the vaned diffuser 4. A plurality of seventh measurement points 700 are spaced apart along the circumferential direction of the dynamic-static fitting gap 50, and each group of the seventh measurement points 700 corresponds to the plurality of booster passages 42 in one-to-one correspondence, with each group including a plurality of seventh measurement points 700. The seventh measurement points 700 within each group are located on the same plane to form the seventh measurement surface. The seventh measurement points 700 are used to detect and obtain flow parameters and environmental parameters of the working fluid within the dynamic-static fitting gap 50.

[0059] The booster passage 42 is used to receive the working fluid from the upstream impeller assembly 3. Before flowing into the booster passage 42, the working fluid first passes through a dynamic-static fitting gap 50 between the impeller assembly 3 and the vaned diffuser 4. A group of seventh measurement points 700 spaced apart along the circumferential direction of the dynamic-static fitting gap 50 can detect the working fluid flowing through the dynamic-static fitting gap 50 and obtain its flow parameters and environmental parameters, which contribute to analyzing the fluid characteristics in the dynamic-static fitting gap 50.

[0060] In some specific embodiments of the present invention, the seventh measurement points 700 in each group are spaced apart in the dynamic-static fitting gap 50 along the flow direction of the working fluid.

[0061] A plurality of seventh measurement points 700 in each group are provided in the dynamic / static fitting gap 50 at intervals along the flow direction of the working fluid, thereby enabling the characteristic changes in the flow direction of the working fluid to be obtained and facilitating comparative analysis of the data. In this embodiment, the number of groups of seventh measurement points 700 is equal to the number of pressure boosting passages 42, i.e., one group of third measurement points 700 is provided for each pressure boosting passage 42. Specifically, each group may include three seventh measurement points 700, but this is not a limitation. In other embodiments, the number of seventh measurement points 700 can be set as needed.

[0062] In some specific embodiments of the present invention, the vaned diffuser 4 includes a booster chamber and a plurality of booster vanes 41 circumferentially spaced apart within the booster chamber, with a plurality of booster passages 42 formed between the plurality of booster vanes 41. The measurement surface further includes an eighth measurement surface, and each booster passage 42 is provided with at least one group of eighth measurement points 800, each group including a plurality of eighth measurement points 800, with the plurality of eighth measurement points 800 in the plurality of groups being located on the same plane to form the eighth measurement surface. The plurality of eighth measurement points 800 are used to detect and obtain flow parameters and environmental parameters of the working fluid in the booster passage 42.

[0063] By providing at least one group of eighth measurement points 800 in each pressure-boosting passage 42, the flow parameters and environmental parameters of the working fluid flowing through each pressure-boosting passage 42 can be detected and acquired, and the pressure-boosting mechanism of the vaned diffuser 4 can be analyzed.

[0064] In some specific embodiments of the present invention, the eighth measurement points 800 in each group are spaced apart in the booster passage 42 along the flow direction of the working fluid.

[0065] The eighth measurement points 800 in each group are spaced apart in the booster passage 42 along the flow direction of the working fluid, allowing for the determination of the change in the characteristics of the working fluid along the flow direction in the booster passage 42 and facilitating data comparison and analysis. In this embodiment, the number of groups of eighth measurement points 800 is equal to the number of booster passages 42, i.e., one group of eighth measurement points 800 is provided for each booster passage 42. Specifically, each group may include at least two eighth measurement points 800, but this is not a limitation. In other embodiments, the number of eighth measurement points 800 can be set as needed.

[0066] 1 to 9 , in some specific embodiments of the present invention, the vaned diffuser 4 includes a booster chamber and a plurality of booster vanes 41 circumferentially spaced apart within the booster chamber, with a diffuser gap 60 formed between the booster vanes 41. The measurement surface further includes a ninth measurement surface, and a plurality of groups of ninth measurement points 900 are provided along the circumferential direction of the diffuser gap 60, each group including a plurality of ninth measurement points 900, with the plurality of ninth measurement points 900 in each group being located on the same plane to form the ninth measurement surface. The plurality of ninth measurement points 900 are used to detect and obtain flow parameters and environmental parameters of the working fluid in the diffuser gap 60.

[0067] A diffuser gap 60 inevitably exists between the booster vane 41 and the inner wall of the booster chamber. When the working fluid flows through the booster passage 42, a part of the working fluid passes through the diffuser gap 60 without passing through the booster passage 42. A group of ninth measurement points 900 provided along the circumferential direction of the diffuser gap 60 can detect and obtain flow parameters and environmental parameters of the working fluid in the diffuser gap 60, thereby facilitating analysis of the fluid characteristics of the working fluid flowing through the vaned diffuser 4.

[0068] In some specific embodiments of the present invention, the plurality of ninth measurement points 900 in each group are provided on the chord line of the end face of the intensifier vane 41 facing the inner wall of the intensifier chamber.

[0069] The ninth measurement points 900 are arranged in such a way that the multiple ninth measurement points 900 in each group are located on the chord line of the end face of the intensifier vane 41 that faces the inner wall of the intensifier chamber, and the ninth measurement points 900 can be rotated adaptively to follow the rotation of the intensifier vane 41, so that the ninth measurement points 900 can always detect the working fluid in the diffuser gap 60. On the other hand, by locating the ninth measurement points 900 on the chord line of the end face of the intensifier vane 41 that faces the inner wall of the intensifier chamber, the detection accuracy can be improved.

[0070] If the ninth measurement point 900 is provided on the inner wall of the intensifier chamber, when the intensifier vane 41 rotates, the ninth measurement point 900 may be misaligned with the intensifier vane 41, making accurate detection impossible.

[0071] The line connecting the leading edge and trailing edge of the intensifier vane 41's end face facing the inner wall of the intensifier chamber is the chord line of the intensifier vane 41's end face facing the inner wall of the intensifier chamber. The number of groups of ninth measurement points 900 is equal to the number of intensifier vanes 41, i.e., one group of ninth measurement points 300 is provided for each intensifier vane 41. In this embodiment, each group includes 2N (N is a positive integer) ninth measurement points 900, and the 2N ninth measurement points 900 are evenly divided along the chord line of the intensifier vane 41's end face facing the inner wall of the intensifier chamber. For example, each group may include four (N is 2) ninth measurement points 900. Of course, in other embodiments, the number of ninth measurement points 900 can be adjusted as needed and is not limited to this embodiment.

[0072] It can be seen that there are diffuser gaps 60 between both sides of the booster vane 41 along a direction perpendicular to the flow direction of the working fluid and the inner wall of the booster chamber, i.e., there are actually two diffuser gaps 60, and that each diffuser gap 60 is provided with a plurality of ninth measurement points 900 groups to improve the accuracy of the detection results.

[0073] 8 , in some specific embodiments of the present invention, the measurement surface further includes a tenth measurement surface, in which a plurality of tenth measurement points 101 groups are spaced apart along the circumferential direction of the vaneless diffuser 5, the plurality of tenth measurement point groups 101 and the plurality of booster passages 42 are arranged in one-to-one correspondence, each group includes a plurality of tenth measurement points 101, and the plurality of tenth measurement points 101 in each group are located on the same plane to form a tenth measurement surface. The plurality of tenth measurement points 101 groups are used to detect and obtain flow parameters and environmental parameters of the working fluid in the vaneless diffuser 5.

[0074] The vaneless diffuser 5 can further statically boost the pressure of the working fluid flowing out of the vaned diffuser 4. A group of tenth measurement points 101 spaced apart along the circumferential direction of the vaneless diffuser 5 detects the working fluid flowing out of each pressure boosting passage 42, and obtains the flow parameters and environmental parameters of the working fluid flowing through the vaneless diffuser 5, thereby enabling the analysis of the diffusion mechanism of the vaneless diffuser 5.

[0075] In some specific embodiments of the present invention, the tenth measurement points 101 in each group are spaced apart on the vaneless diffuser 5 along the flow direction of the working fluid.

[0076] A plurality of tenth measurement points 101 in each group are spaced apart on the vaneless diffuser 5 along the flow direction of the working fluid, allowing for the determination of the characteristic changes in the flow direction of the working fluid within the vaneless diffuser 5 and facilitating comparative analysis of the data. In this embodiment, the number of groups of tenth measurement points 101 is equal to the number of booster passages 42, i.e., one group of tenth measurement points 101 is provided for each booster passage 42. Specifically, each group may include at least three tenth measurement points 101, but this is not a limitation. In other embodiments, the number of tenth measurement points 101 can be set as needed.

[0077] 10 , in some specific embodiments of the present invention, the measurement surface further includes an eleventh measurement surface, and a plurality of eleventh measurement points 102 are provided at the outlet cross section of the outflow passage 7. One of the eleventh measurement points 102 is provided at the center of the outlet cross section of the outflow passage 7, and the remaining eleventh measurement points 102 are provided at intervals along the circumferential direction and the radial direction of the center of the outlet cross section of the outflow passage 7. The plurality of eleventh measurement points 102 are located on the same plane to form an eleventh measurement surface. The plurality of eleventh measurement points 102 are used to detect and obtain flow parameters and environmental parameters of the working fluid at the outlet of the outflow passage 7.

[0078] By setting a plurality of eleventh measurement points 102 on the outlet cross section of the inlet passage 7, the plurality of eleventh measurement points 102 are located on the same plane to form an eleventh measurement plane, one of the eleventh measurement points 102 is provided at the center of the outlet cross section of the outlet passage 7, and the remaining eleventh measurement points 102 are provided at intervals along the circumferential direction and the radial direction from the center of the outlet cross section. This makes it possible to detect the working fluid at a plurality of positions at the center, radial direction, and circumferential direction of the outlet of the outlet passage 7 and to obtain flow parameters and environmental parameters of the working fluid at various positions at the outlet of the outlet passage 7. The plurality of eleventh measurement points 102 allows multiple sets of data to be obtained, improving detection accuracy.

[0079] In some specific embodiments of the present invention, the multiple 11th measurement points 102 located on the same circumference are evenly distributed and arranged to surround each other to form a circular area, and the difference in area between any two adjacent circular areas along the radial direction of the outlet cross section of the outflow passage 7 is equal.

[0080] When arranging the multiple 11th measurement points 102 on the outlet cross section of the outflow passage 7, the "equal area method" is adopted to evenly distribute the multiple 11th measurement points 102 on the inlet cross section of the outflow passage 7, and represent a surface with multiple points, thereby obtaining the performance parameters of the fluid at various positions at the outlet of the outflow passage 7, making the measurement data more comprehensive and accurate.

[0081] In some specific embodiments of the present invention, the number of eleventh measurement points 102 provided on each circumference is equal, and the eleventh measurement points 102 provided on each circumference are provided in one-to-one correspondence. The multiple eleventh measurement points 102 located on the same diameter are fixed together by a second bracket, and the second bracket is inserted or penetrated radially into the outflow passage 7.

[0082] The above arrangement allows for easy fixing of multiple eleventh measurement points 102. Fixing multiple eleventh measurement points 102 located on the same diameter together via the same bracket reduces the number of brackets, avoiding the need for too many brackets, which can cause resistance to the flow of the working fluid. In this embodiment, four eleventh measurement points 102 are evenly spaced on each circumference, resulting in eleven eleventh measurement points 102 distributed on the same diameter, for a total of 21 (4 × 5 + 1 = 21) eleventh measurement points 102, but this is not limiting. In other embodiments, the number of eleventh measurement points 102 can be adjusted as needed.

[0083] In the embodiments of the present invention, the flow parameters of the working fluid include at least one of the pressure, temperature, velocity, flow rate, vibration displacement, phase concentration, viscosity, Reynolds number, and surface tension of the working fluid, and the environmental parameters of the working fluid include at least one of the sound pressure decibels, humidity, surface roughness, and wear amount of the environment in which the working fluid is located.

[0084] Specifically, pressure includes static pressure, total pressure, and differential pressure. Temperature includes static temperature and total temperature. Flow velocity includes average velocity, instantaneous velocity, absolute velocity, relative velocity, and peripheral velocity. Flow rate includes volumetric flow rate and mass flow rate. Oscillatory displacement includes low frequency, medium frequency, and high frequency. Phase concentration includes gas-liquid and liquid-solid. Viscosity includes Newtonian and non-Newtonian. Reynolds number includes laminar flow, transitional flow, and turbulent flow. Surface tension includes static and dynamic.

[0085] Specifically, sound pressure decibels include fluid noise, mechanical noise, and electromagnetic noise. Humidity includes absolute humidity and relative humidity. Surface roughness includes average roughness and maximum height. Wear volume includes abrasive particles, adhesion, and fatigue.

[0086] The above obtained parameters can be used to create a core database for design optimization reference, which is helpful for optimizing and improving the centrifugal compressor design.

[0087] In this embodiment, the working fluid may be a medium of gas phase, liquid phase, gas-liquid two-phase flow, etc. For example, the working fluid may be air, and the air is compressed by a centrifugal compressor.

[0088] The specific structures of the inlet passage 1, the guide vane assembly 2, the impeller assembly 3, the vaned diffuser 4, the vaneless diffuser 5, the volute casing assembly 6, and the outlet passage 7 of the centrifugal compressor are all conventional technologies, and will not be described in detail in this embodiment.

[0089] At the same time, in this embodiment, both the inlet guide vane 21 and the intensifier vane 41 are manufactured using additive manufacturing technology, i.e., printing technology, which provides greater design freedom, efficiency and sustainability, flexible production, short production cycles, lightweight and performance optimization, and sustainable manufacturing. However, without being limited thereto, in other embodiments, the inlet guide vane 21 and the intensifier vane 41 may be manufactured by other methods.

[0090] The present invention further provides a measuring device, which includes a detection sensor and the centrifugal compressor according to any of the above specific embodiments, and each measuring surface of the centrifugal compressor is provided with a detection sensor. Since the measuring device of the present invention includes a detection sensor and the centrifugal compressor according to any of the above specific embodiments, the measuring device has the same technical effect as the centrifugal compressor according to any of the above specific embodiments. For details, please refer to the above description, and the description will be omitted here.

[0091] Specifically, in order to acquire flow parameters and environmental parameters of the working fluid at different preset positions, detection sensors are provided at the first measurement point 100, the second measurement point 200, the third measurement point 300, the fourth measurement point 400, the fifth measurement point 500, the sixth measurement point 600, the seventh measurement point 700, the eighth measurement point 800, the ninth measurement point 900, the tenth measurement point 101, and the eleventh measurement point 102, respectively.

[0092] The detection sensor includes at least one of a contact sensor and a non-contact sensor. The contact sensor may be at least one of a piezoresistive pressure sensor, a strain gauge pressure gauge, a thermocouple, a thermistor, a turbine flow meter, an electromagnetic flow meter, a differential pressure flow meter, a target flow meter, an accelerometer, a strain gauge, a conductivity sensor, a capacitance sensor, a rotational viscometer, a capillary viscometer, a multi-parameter composite sensor, a du Nouy method sensor, a plate method sensor, a contact microphone, a capacitance hygrometer, a stylus profiler, and a displacement sensor. The non-contact sensor may be at least one of a piezoelectric pressure sensor, a capacitive pressure sensor, an infrared thermometer, an ultrasonic flow meter, a laser Doppler velocimeter (LDV), a non-contact electromagnetic flow meter, an ultrasonic flow meter, a laser vibrometer, a near-infrared spectrum sensor, a microwave sensor, a microwave / radio frequency sensor, a non-contact flow meter + viscosity sensor, a laser surface roughness sensor, a laser microphone, an infrared humidity sensor, a microwave humidity sensor, a laser interferometer, a white light interferometer, an ultrasonic thickness gauge, and an optical 3D scanner.

[0093] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the above embodiments or to replace some of the technical features with equivalents, and such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions in the embodiments of the present invention. [Explanation of symbols]

[0094] 1 Inflow passage 2 Guide vane assembly 3 Impeller Assembly 4-vaned diffuser 5. Vaneless diffuser 6 Volute Casing Assembly 7 Outflow passage 10 Inlet guide vane clearance 20 Central fitting gap 21 Inlet guide vane 30 Tip clearance 31 Impeller 40 disc cavity 41 Booster blade 42 Pressure booster passage 50 Dynamic and static fit clearance 60 Diffuser gap 100 1st measurement point 101 10th measurement point 102 11th measurement point 200 2nd measurement point 300 3rd measurement point 400 4th measurement point 500 5th measurement point 600 6th measurement point 700 7th measurement point 800 8th measurement point 900 9th measurement point

Claims

1. A centrifugal compressor, an inlet passage (1); a guide vane assembly (2) provided in the inlet passage (1); an impeller assembly (3) provided downstream of the guide vane assembly (2); a vaned diffuser (4) located downstream of the impeller assembly (3); a vaneless diffuser (5) disposed downstream of the vaned diffuser (4); a volute casing assembly (6) located downstream of the vaneless diffuser (5); an outflow passage (7) provided downstream of the volute casing assembly (6); a measuring surface provided at the inlet of the inlet passage (1), the inlet and the outlet of the guide vane assembly (2), between the inlet and the outlet of the impeller assembly (3), between the impeller assembly (3) and the vaned diffuser (4), between the inlet and the outlet of the vaned diffuser (4), between the inlet and the outlet of the vaneless diffuser (5), and at the outlet of the outflow passage (7), respectively.

2. The measurement surface includes a first measurement surface, and a plurality of first measurement points (100) are provided at an inlet cross section of the inlet passage (1); One of the first measurement points (100) is provided at the center of the inlet cross section of the inlet passage (1), and the remaining first measurement points (100) are provided at intervals along the circumferential direction and the radial direction of the center of the inlet cross section of the inlet passage (1); The plurality of first measurement points (100) are located on the same plane and form the first measurement surface; the plurality of first measurement points (100) located on the same circumference are uniformly distributed and arranged to surround and form a circular region, and the difference in area between any two adjacent circular regions in the radial direction of the inlet cross section of the inlet passage (1) is equal; The number of the first measurement points (100) provided on each circumference is equal, and the first measurement points (100) on each circumference are provided in one-to-one correspondence; 2. The centrifugal compressor according to claim 1, wherein the plurality of first measuring points (100) located on the same diameter are fixed together by a first bracket, and the first bracket is inserted or penetrated into the inlet passage (1) along the radial direction.

3. an inlet guide vane gap (10) is provided between the guide vane assembly (2) and the inner wall of the inlet passage (1); The measurement surface further includes a second measurement surface, and a plurality of groups of second measurement points (200) are provided along the circumferential direction of the inlet guide vane gap (10), each group including a plurality of the second measurement points (200), and the plurality of second measurement points (200) in each group are located on the same plane to form the second measurement surface; 3. The centrifugal compressor according to claim 1, wherein the guide vane assembly (2) includes a plurality of inlet guide vanes (21), and the plurality of second measurement points (200) in each group are provided on a chord line of an end face of each of the inlet guide vanes (21) facing the inner wall of the inlet passage (1).

4. The guide vane assembly (2) includes a plurality of inlet guide vanes (21), the plurality of inlet guide vanes (21) forming a central fitting gap (20) toward the center of the inlet passage (1); The measurement surface further includes a third measurement surface, and a plurality of groups of third measurement points (300) are provided along the circumferential direction of the central fitting gap (20), each group including a plurality of the third measurement points (300), and the plurality of third measurement points (300) in each group are located on the same plane to form the third measurement surface; 3. The centrifugal compressor according to claim 1, wherein a plurality of the third measurement points (300) in each group are provided on a chord line of an end face of the inlet guide vane (21) toward the center of the inlet passage (1).

5. The measurement surface further includes a fourth measurement surface, and a plurality of fourth measurement points (400) are provided at intermediate positions between the guide vane assembly (2) and the impeller assembly (3); The plurality of fourth measurement points (400) are located on the same plane to form the fourth measurement surface; 3. The centrifugal compressor according to claim 1, wherein the fourth measurement points are spaced apart along the circumferential direction of the inlet passage at intermediate positions between the guide vane assembly and the impeller assembly.

6. The measurement surface further includes a fifth measurement surface, and a plurality of fifth measurement points (500) are provided between the inlet and the outlet of the impeller assembly (3); The plurality of fifth measurement points (500) are provided at intervals along the flow direction of the working fluid, and the plurality of fifth measurement points (500) are located on the same plane to form the fifth measurement surface; The impeller assembly (3) an impeller cover connected to the inlet passage (1) and the vaned diffuser (4); an impeller (31) rotatably provided inside the impeller cover, wherein a blade tip gap (30) is provided between the circumferential direction of the impeller (31) and an inner wall of the impeller cover; The plurality of fifth measurement points (500) are provided at intervals on the impeller cover along the flow direction of the working fluid, The impeller cover is provided so as to gradually widen along the flow direction of the working fluid, The difference in the projected area of ​​the circumferential surface on which any two adjacent fifth measurement points (500) are located in a direction perpendicular to the flow direction of the working fluid in the inlet passage (1) is equal, a disk cavity (40) is provided between the side of the impeller (31) away from the guide vane assembly (2) and the impeller cover; The measurement surface further includes a sixth measurement surface, and a plurality of sixth measurement points (600) are provided at intervals along the circumferential direction and the radial direction of the disk cavity (40), and the sixth measurement points (600) are located on the same plane to form the sixth measurement surface; 3. The centrifugal compressor according to claim 1, wherein the sixth measurement points (600) located on the same circumference are arranged to surround each other to form a circular area, and the difference in area between any two adjacent circular areas along the radial direction of the disk cavity (40) is equal.

7. The vaned diffuser (4) includes a booster chamber and a plurality of booster vanes (41) arranged at intervals in the circumferential direction within the booster chamber, and a plurality of booster passages (42) are formed between the plurality of booster vanes (41); the measurement surface further includes a seventh measurement surface, a dynamic / static fitting gap (50) is provided between the impeller assembly (3) and the vaned diffuser (4), a group of seventh measurement points (700) is provided at intervals along the circumferential direction of the dynamic / static fitting gap (50), the group of seventh measurement points (700) is provided in one-to-one correspondence with the plurality of pressure booster passages (42), each group includes a plurality of the seventh measurement points (700), and the plurality of seventh measurement points (700) in the plurality of groups are located on the same plane to form the seventh measurement surface; 3. The centrifugal compressor according to claim 1, wherein the seventh measurement points (700) in each group are provided in the dynamic-static fitting gap (50) at intervals along the flow direction of the working fluid.

8. The vaned diffuser (4) includes a booster chamber and a plurality of booster vanes (41) arranged at intervals in the circumferential direction within the booster chamber, and a plurality of booster passages (42) are formed between the plurality of booster vanes (41); the measurement surface further includes an eighth measurement surface, and each of the pressure-increasing passages (42) is provided with at least one group of eighth measurement points (800), each group including a plurality of the eighth measurement points (800), and the plurality of eighth measurement points (800) in the plurality of groups are located on the same plane to form the eighth measurement surface; 3. The centrifugal compressor according to claim 1, wherein the eighth measurement points (800) in each group are spaced apart in the booster passage (42) along the flow direction of the working fluid.

9. The vaned diffuser (4) includes a booster chamber and a plurality of booster vanes (41) arranged at intervals in the circumferential direction within the booster chamber, and a diffuser gap (60) is provided between the booster vanes (41) and an inner wall of the booster chamber; the measurement surface further includes a ninth measurement surface, and a plurality of groups of ninth measurement points (900) are provided along the circumferential direction of the diffuser gap (60), each group including a plurality of the ninth measurement points (900), and the plurality of ninth measurement points (900) in each group are located on the same plane to form the ninth measurement surface; 3. The centrifugal compressor according to claim 1, wherein the plurality of ninth measurement points (900) in each group are provided on a chord line of an end surface of the booster vane (41) facing an inner wall of the booster chamber.

10. The vaned diffuser (4) includes a booster chamber and a plurality of booster vanes (41) arranged at intervals in the circumferential direction within the booster chamber, and a plurality of booster passages (42) are formed between the plurality of booster vanes (41); the measurement surface further includes a tenth measurement surface; a plurality of tenth measurement point (101) groups are provided at intervals along the circumferential direction of the vaneless diffuser (5), the plurality of tenth measurement point (101) groups are provided in one-to-one correspondence with the plurality of pressure-boosting passages (42), each group includes a plurality of the tenth measurement points (101), and the plurality of tenth measurement points (101) in each group are located on the same plane to form the tenth measurement surface; 3. The centrifugal compressor according to claim 1, wherein the tenth measurement points (101) in each group are spaced apart on the vaneless diffuser (5) along the flow direction of the working fluid.

11. The measurement surface further includes an eleventh measurement surface, and a plurality of eleventh measurement points (102) are provided on the outlet cross section of the outflow passage (7); One of the eleven measurement points (102) is provided at the center of the outlet cross section of the outflow passage (7), and the remaining eleven measurement points (102) are provided at intervals along the circumferential direction and the radial direction of the center of the outlet cross section of the outflow passage (7); The plurality of eleventh measurement points (102) are located on the same plane to form the eleventh measurement surface; the plurality of eleventh measurement points (102) located on the same circumference are uniformly distributed and arranged to surround a circular region, and the difference in area between any two adjacent circular regions in the radial direction of the outlet cross section of the outflow passage (7) is equal; The number of the eleventh measurement points (102) provided on each circumference is equal, and the eleventh measurement points (102) on each circumference are provided in one-to-one correspondence; 3. The centrifugal compressor according to claim 1, wherein the plurality of eleventh measuring points (102) located on the same diameter are fixed together by a second bracket, and the second bracket is inserted or penetrated into the outlet passage (7) along a radial direction.

12. a detection sensor and the centrifugal compressor according to claim 1 or 2, A measuring device, characterized in that the detection sensor is provided on each measurement surface of the centrifugal compressor.

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