A centrifugal compressor basic stage test device capable of combined adjustment

Abstract

The present invention provides a basic stage test device for a centrifugal compressor capable of combined adjustment. Among them, an inlet guide vane bracket is installed on the open side of the basic stage test volute. An inlet flow deflector is installed inside the inlet guide vane bracket. A plurality of inlet guide vanes are installed radially inside the inlet guide vane bracket. The inlet guide vanes are driven and adjusted by an inlet guide vane adjustment mechanism; a diffuser guide vane bracket is installed inside the basic stage test volute. A plurality of diffuser guide vanes are installed on the diffuser guide vane bracket. The diffuser guide vanes are driven and adjusted by a diffuser guide vane adjustment mechanism; the present invention adopts the combination of the inlet guide vane adjustment mechanism and the diffuser guide vane adjustment mechanism to realize the combined adjustment of the inlet guide vanes and the diffuser guide vanes, and can also perform variable speed adjustment according to needs, providing better equipment guarantee for the test of the basic stage. The present invention can meet the test functions of various basic stages, is simple and accurate in operation, and saves the production cost and test cost of test pieces.

Description

Technical Field

[0001] The present invention belongs to the field of centrifugal compressors, relates to a basic stage, and particularly relates to a test device for a centrifugal compressor basic stage capable of combined adjustment. Background Art

[0002] Centrifugal compressors play a very important role in various fields of the national economy and are widely used in industrial fields such as metallurgy, petrochemical, coal chemical, natural gas transportation, refrigeration, and power, and are known as "heart" equipment. How to ensure the long-term, efficient, and stable operation of centrifugal compressors is one of the core issues jointly concerned by compressor selection design and on-site operation. At present, the selection design of centrifugal compressors is mostly carried out according to the modular method. Among them, the basic stage, as the source of compressor modular design, directly determines the performance and energy consumption level of compressor products.

[0003] The experimental test method, as the most intuitive and effective means to verify the performance of the basic stage, is still one of the important tasks for the current development and optimization of the basic stage. In addition, the basic stage experimental test method is often used as an indispensable verification measure for other basic stage development methods to finally test and confirm the actual performance and operation effect of the newly developed basic stage. Therefore, the performance test work of the centrifugal compressor basic stage is crucial for compressor design and technological development.

[0004] The composition of typical centrifugal compressor basic stage performance test methods and test systems is generally designed and implemented with reference to the centrifugal compressor performance test standard specifications, such as ASME PTC10-1997 "Performance Test Code on Compressors and Exhausters" and JB / T 3165-1999 "Thermodynamic Performance Test of Centrifugal and Axial Flow Blowers and Compressors".

[0005] Since in the actual production and operation of centrifugal compressors, the operating parameters of the supporting process system will inevitably change, the centrifugal compressor often does not operate at a specific operating point, but adjusts the operating conditions of the compressor in real time according to production requirements. Currently, the commonly used centrifugal compressor adjustment methods mainly include 5 types: inlet throttling, outlet throttling, adjustable inlet guide vanes, adjustable vane diffusers, and variable speed adjustment. Among them, the latter three adjustment methods are only applicable to compressors designed with centrifugal basic stages that match them. Therefore, the performance test work of the centrifugal basic stage needs to be carried out in combination with the adjustment means actually applied to the compressor or the combined adjustment means applicable at the beginning of the basic stage design. In addition, for centrifugal basic stages with fixed vane angles and vaned diffusers, there are generally multiple matching diffuser vane angles available for compressor design selection. For such basic stages, it is also necessary to test the basic stage performance of multiple diffuser vane angles.

[0006] At present, the commonly used basic-level performance test methods mainly include: single adjustment means and combined adjustment means. Among them, the basic-level test method of single adjustment means mainly refers to variable speed adjustment. The combined adjustment means include: adjustable inlet guide vane and variable speed combined adjustment, adjustable vane diffuser and variable speed combined adjustment.

[0007] Existing basic-level test methods all have certain limitations. For example, the basic-level test method using variable speed single adjustment means is only applicable to the performance test of the basic level without an inlet guide vane and with a vaneless diffuser; the adjustable inlet guide vane and variable speed combined adjustment method is only applicable to the performance test of the basic level with a vaneless diffuser; the adjustable vane diffuser and variable speed combined adjustment is only applicable to the performance test of the basic level without an inlet guide vane and with a vane diffuser. Summary of the Invention

[0008] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a basic-level test device for a centrifugal compressor capable of combined adjustment, so as to solve the technical problem that the basic-level test in the existing technology is difficult to be applicable to various adjustment means.

[0009] In order to solve the above technical problems, the present invention is realized by adopting the following technical solutions:

[0010] A basic-level test device for a centrifugal compressor capable of combined adjustment includes a basic-level test volute with one side open and the other side closed. A circle of volute chambers is arranged on the circumferential inner wall of the basic-level test volute. An exhaust air duct communicating with the volute chamber is arranged on the volute chamber. An impeller is arranged in the basic-level test volute. The inlet of the impeller faces the open side of the basic-level test volute, and the outlet of the impeller faces the volute chamber. The impeller is driven to rotate by an impeller drive main shaft extending outside the closed side of the basic-level test volute;

[0011] An inlet guide vane bracket is installed on the open side of the basic-level test volute. An inlet flow guide is installed in the inlet guide vane bracket. A plurality of inlet guide vanes are installed radially in the inlet guide vane bracket. The shanks of the inlet guide vanes are arranged radially outward, the blades of the inlet guide vanes are arranged radially inward. The shanks of the inlet guide vanes pass through the inlet guide vane mounting holes opened on the inlet guide vane bracket and extend outside the inlet guide vane bracket. The inlet guide vanes are driven and adjusted by an inlet guide vane adjustment mechanism;

[0012] A diffuser guide vane bracket is installed in the basic-level test volute. A plurality of diffuser guide vanes are installed on the diffuser guide vane bracket. The diffuser guide vanes are driven and adjusted by a diffuser guide vane adjustment mechanism;

[0013] The described inlet guide vane bracket includes an air inlet duct section, a mounting section, and a guide vane contraction section that are integrally arranged in sequence. The open end of the guide vane contraction section that contracts is close to but does not contact the edge of the impeller seal body on the shroud side of the impeller. An end cover is provided on the outer wall of the guide vane contraction section, and the end cover is installed on the open side of the basic stage test volute so that the entire inlet guide vane bracket is installed on the open side of the basic stage test volute.

[0014] The described inlet guide vane adjusting mechanism includes a first linkage ring. The first linkage ring is sleeved outside the mounting section. A plurality of first roller bearings are evenly distributed and installed on one side of the first linkage ring at equal diameters. A first guide rail groove is circumferentially formed on the outer wall of the mounting section. The plurality of first roller bearings are stuck in the first guide rail groove to support the first linkage ring, so that there is no contact between the first linkage ring and the mounting section. When the first linkage ring rotates circumferentially around the mounting section, the plurality of first roller bearings move circumferentially in the first guide rail groove.

[0015] An inlet guide vane guard that is sleeved outside the mounting section is provided outside the first linkage ring. An angular travel actuator is fixedly installed on the inlet guide vane guard. The rotating shaft of the angular travel actuator is connected to one end of a first drive gear shaft that extends outside the inlet guide vane guard to drive the first drive gear shaft to rotate. A first large gear is fixedly installed at the other end of the first drive gear shaft. The first large gear meshes with a first arc-shaped rack that is concentrically arranged on the other side of the first linkage ring, so that the rotation of the rotating shaft of the angular travel actuator drives the first linkage ring to move circumferentially.

[0016] The outer edge of the first linkage ring is evenly provided with hinge joints corresponding to a plurality of inlet guide vanes along the radial direction. Each hinge joint is hinged to one end of a first linkage plate. The other end of each first linkage plate is hinged to one end of a first crank. The other end of each first crank is fixedly connected to the blade handle of an inlet guide vane that extends outside the mounting section. Under the circumferential rotation of the first linkage ring, each inlet guide vane is driven to rotate around its own radial central axis, realizing the drive adjustment of the inlet guide vane.

[0017] The described diffuser guide vane bracket includes a second positioning installation cylinder with one end open. A ring-shaped disc is provided at the other end of the second positioning installation cylinder. A pressing flange is provided around the edge of the open end of the second positioning installation cylinder. The second positioning installation cylinder is sleeved inside the basic stage test volute. The pressing flange is installed on a pressing step provided on the inner edge of the open side of the basic stage test volute. The pressing flange is pressed through the assembly of the end cover of the inlet guide vane bracket and the open side of the basic stage test volute, realizing the installation of the diffuser guide vane bracket.

[0018] The described impeller is located within the central hole of the annular disc. The edge of the shroud side of the impeller outlet is in the same axial section as the annular disc, and the inner edge of the central hole of the annular disc is close to but does not contact the edge of the shroud side of the impeller outlet. An annular impeller seal body is fixedly installed near the central hole on the inner side of the annular disc. The impeller seal body is close to but does not contact the shroud of the impeller.

[0019] On the annular disc of the diffuser guide vane bracket, there are diffuser guide vane mounting holes corresponding to a plurality of diffuser guide vanes one by one. The petioles of each diffuser guide vane are arranged axially. The blades of each diffuser guide vane are bent radially outward. The inner end of the blade of each diffuser guide vane is vertically fixed on the corresponding petiole. The petiole of each diffuser guide vane is installed in the diffuser guide vane mounting hole, and the petiole of the diffuser guide vane can rotate within the diffuser guide vane mounting hole. The blades of the diffuser guide vanes are located on the outer side of the annular disc.

[0020] The diffuser guide vane adjusting mechanism includes a second linkage ring. The second linkage ring is sleeved outside the impeller seal body. On one side of the second linkage ring, a plurality of second roller bearings are evenly distributed in an equal-diameter manner. A circle of second guide grooves is provided along the circumferential direction on the outer wall of the impeller seal body. The plurality of second roller bearings are stuck in the second guide grooves to support the second linkage ring, so that there is no contact between the second linkage ring and the impeller seal body. When the second linkage ring rotates circumferentially around the impeller seal body, the plurality of second roller bearings move circumferentially within the second guide grooves.

[0021] A linear actuator is fixedly installed outside the basic stage test volute. One end of the linear actuator is hinged to one end of a second linkage plate. The other end of the second linkage plate extends into the inlet guide vane shroud. The other end of the second linkage plate is vertically fixedly installed with one end of an axially arranged second drive gear shaft. The other end of the second drive gear shaft passes through the end cover of the inlet guide vane bracket. The end of the other end of the second drive gear shaft is fixedly installed with a second large gear. The second large gear meshes with a second arc-shaped rack concentrically arranged on one side of the second linkage ring, so that the telescopic movement of the telescopic rod of the linear actuator drives the circumferential movement of the second linkage ring.

[0022] On the second linkage ring, there are drive bar-shaped grooves corresponding to the diffuser guide vanes one by one. The drive bar-shaped grooves penetrate both sides of the second linkage ring. One drive rod is installed in each drive bar-shaped groove. One end of each drive rod is vertically fixed to one end of a second crank. The other end of each second crank is vertically fixedly installed with a petiole of a diffuser guide vane extending into the inner side of the annular disc.

[0023] Under the circumferential rotation of the second linkage ring, it drives the petiole of each diffuser guide vane to rotate around its own axial central axis as the rotation central axis, and further drives the change of the blade angle of each diffuser guide vane, realizing the drive adjustment of the diffuser guide vane.

[0024] The present invention also has the following technical features:

[0025] The inlet guide vane includes a first positioning and installation cylinder that fits and sleeves inside the intake air duct section. Inside the first positioning and installation cylinder, an inlet streamline head is coaxially arranged and fixed by rib plates.

[0026] At the end of the rotating shaft of the angular travel actuator, an internal gear sleeve is fixedly arranged. At one end of the first driving gear shaft, a first pinion is fixedly arranged. The first pinion is sleeved inside the internal gear sleeve and meshes with each other, so that the angular travel actuator drives the first driving gear shaft to rotate.

[0027] At the other end of the second linkage plate, an internal gear hole is arranged. At one end of the second driving gear shaft, a second pinion is fixedly arranged. The second pinion is sleeved inside the internal gear hole and meshes with each other, so that the linear travel actuator drives the second driving gear shaft to rotate.

[0028] The first driving gear shaft is installed on the inlet guide vane shroud through the first driving gear shaft support seat. The first driving gear shaft is arranged axially and can rotate relative to the first driving gear shaft support seat.

[0029] The second driving gear shaft is installed on the inlet guide vane bracket through the second driving gear shaft support seat. The second driving gear shaft support seat is arranged on the outer wall of the flow guiding and contracting cylinder section of the inlet guide vane bracket. The second driving gear shaft can rotate relative to the second driving gear shaft support seat.

[0030] All the hinges are realized by using spherical plain bearings.

[0031] A rolling bearing is installed at the position where the driving rod contacts the driving strip groove.

[0032] Compared with the prior art, the present invention has the following technical effects:

[0033] The present invention adopts the combination of the inlet guide vane adjustment mechanism and the diffuser guide vane adjustment mechanism to realize the combined adjustment of the inlet guide vane and the diffuser guide vane. It can also perform variable speed adjustment according to needs, providing better equipment guarantee for the basic stage test. The present invention can meet various basic stage test functions, is simple and accurate in operation, saves the production cost and test cost of test pieces, and at the same time saves the replacement and installation time of each test piece, shortening the basic stage test cycle. Description of the Drawings

[0034] Figure 1 It is a schematic external three-dimensional structure diagram of the basic stage test device for a centrifugal compressor.

[0035] Figure 2 It is a schematic front view structure diagram of the basic stage test device for a centrifugal compressor.

[0036] Figure 3 It is a schematic side-sectional view structure diagram of a basic stage test device for a centrifugal compressor.

[0037] Figure 4 It is a schematic installation structure diagram of the first linkage ring.

[0038] Figure 5 It is a schematic installation structure diagram of the second linkage ring.

[0039] Figure 6 It is a schematic structure diagram of the first linkage ring.

[0040] Figure 7 It is a schematic structure diagram of the inlet guide vane regulating mechanism.

[0041] Figure 8 It is a schematic structure diagram of the second linkage ring.

[0042] Figure 9 It is a schematic structure diagram of one perspective of the diffuser guide vane regulating mechanism.

[0043] Figure 10 It is a schematic structure diagram of another perspective of the diffuser guide vane regulating mechanism.

[0044] Figure 11 It is a schematic structure diagram of the diffuser guide vane bracket.

[0045] Figure 12 It is a schematic diagram of a certain centrifugal basic stage closed performance test system in the application example.

[0046] The meanings of each label in the figure are as follows: 1 - basic stage test volute, 2 - volute chamber, 3 - exhaust air duct, 4 - impeller, 5 - impeller drive main shaft, 6 - inlet guide vane bracket, 7 - inlet flow straightener, 8 - inlet guide vane, 9 - inlet guide vane regulating mechanism, 10 - inlet guide vane guard, 11 - diffuser guide vane bracket, 12 - diffuser guide vane, 13 - diffuser guide vane regulating mechanism, 14 - impeller seal body, 15 - spherical plain bearing, 16 - inlet guide vane mounting hole, 17 - diffuser guide vane mounting hole.

[0047] 18 - basic stage test device for a centrifugal compressor capable of combined regulation, 19 - gearbox, 20 - motor, 21 - inlet and outlet water pipes, 22 - first regulating valve, 23 - second regulating valve, 24 - inlet and make-up air port, 25 - cooler, 26 - intake muffler, 27 - straightening grid, 28 - motor frequency conversion system, 29 - actuator regulating system, 30 - data acquisition system, 31 - gas mass spectrometry system.

[0048] 601 - intake air duct section, 602 - installation section, 603 - flow guiding and contracting cylinder section, 604 - end cover.

[0049] 701 - First positioning and mounting cylinder, 702 - Rib plate, 703 - Inlet streamline head.

[0050] 901 - First linkage ring, 902 - First roller bearing, 903 - First guide rail groove, 904 - Angular travel actuator, 905 - First drive gear shaft, 906 - First large gear, 907 - First arc-shaped rack, 908 - Hinge joint, 909 - First linkage plate, 910 - First crank, 911 - First small gear,, 912 - First drive gear shaft support seat.

[0051] 1101 - Second positioning and mounting cylinder, 1102 - Annular disc, 1103 - Compression flange, 1104 - Compression stepped platform.

[0052] 1301 - Second linkage ring, 1302 - Second roller bearing, 1303 - Second guide rail groove, 1304 - Linear travel actuator, 1305 - Second linkage plate, 1306 - Second drive gear shaft, 1307 - Second large gear, 1308 - Second arc-shaped rack, 1309 - Drive strip groove, 1310 - Drive rod, 1311 - Second crank, 1312 - Second small gear, 1313 - Second drive gear shaft support seat.

[0053] The following further elaborates on the specific content of the present invention in conjunction with embodiments. Detailed implementation mode

[0054] It should be noted that all components and materials in the present invention, without special instructions, are all components and materials known in the art.

[0055] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0056] Embodiment 1:

[0057] This embodiment provides a basic stage test device for a centrifugal compressor capable of combined adjustment, as Figures 1 to 11 shown, including a basic stage test volute 1 with one side open and the other side closed. A circle of volute chambers 2 are arranged on the circumferential inner wall of the basic stage test volute 1. An exhaust air duct 3 communicating with the volute chamber 2 is arranged on the volute chamber 2. An impeller 4 is arranged in the basic stage test volute 1. The inlet of the impeller 4 faces the open side of the basic stage test volute 1, and the outlet of the impeller 4 faces the volute chamber 2. The impeller 4 is driven to rotate by an impeller drive main shaft 5 extending outside the closed side of the basic stage test volute 1.

[0058] An inlet guide vane bracket 6 is installed on the open side of the basic-level test volute 1. An inlet flow deflector 7 is installed inside the inlet guide vane bracket 6. A plurality of inlet guide vanes 8 are installed radially inside the inlet guide vane bracket 6. The shanks of the inlet guide vanes 8 are radially outward, and the blades of the inlet guide vanes 8 are radially inward. The shanks of the inlet guide vanes 8 pass through the inlet guide vane mounting holes 16 opened on the inlet guide vane bracket 6 and extend outside the inlet guide vane bracket 6. The inlet guide vanes 8 are driven and adjusted by an inlet guide vane adjusting mechanism 9;

[0059] A diffuser guide vane bracket 11 is installed inside the basic-level test volute 1. A plurality of diffuser guide vanes 12 are installed on the diffuser guide vane bracket 11. The diffuser guide vanes 12 are driven and adjusted by a diffuser guide vane adjusting mechanism 13;

[0060] The inlet guide vane bracket 6 includes an air inlet barrel section 601, a mounting section 602, and a flow guiding and contracting barrel section 603 that are integrally arranged in sequence. The open end of the flow guiding and contracting barrel section 603 that contracts is close to but does not contact the edge of the impeller seal body 14 on the shroud side of the impeller 4. An end cover 604 is provided on the outer wall of the flow guiding and contracting barrel section 603. The end cover 604 is installed on the open side of the basic-level test volute 1 so that the entire inlet guide vane bracket 6 is installed on the open side of the basic-level test volute 1.

[0061] The inlet guide vane adjusting mechanism 9 includes a first linkage ring 901. The first linkage ring 901 is sleeved outside the mounting section 602. A plurality of first roller bearings 902 are evenly distributed and installed on one side of the first linkage ring 901. A first guide rail groove 903 is opened along the circumference on the outer wall of the mounting section 602. The plurality of first roller bearings 902 are stuck in the first guide rail groove 903 to support the first linkage ring 901, so that there is no contact between the first linkage ring 901 and the mounting section 602. When the first linkage ring 901 rotates circumferentially around the mounting section 602, the plurality of first roller bearings 902 move circumferentially in the first guide rail groove 903;

[0062] An inlet guide vane guard 10 sleeved outside the mounting section 602 is provided outside the first linkage ring 901. An angular travel actuator 904 is fixedly installed on the inlet guide vane guard 10. The rotating shaft of the angular travel actuator 904 is connected to one end of a first drive gear shaft 905 extending outside the inlet guide vane guard 10 to drive the first drive gear shaft 905 to rotate. A first large gear 906 is fixedly installed at the other end of the first drive gear shaft 905. The first large gear 906 meshes with a first arc-shaped rack 907 concentrically arranged on the other side of the first linkage ring 901, so that the rotation of the rotating shaft of the angular travel actuator 904 drives the first linkage ring 901 to move circumferentially;

[0063] On the outer edge of the first linkage ring 901, hinge joints 908 corresponding to a plurality of inlet guide vanes 8 are uniformly arranged radially outward. One end of each hinge joint 908 is hinged to one end of a first linkage plate 909. The other end of each first linkage plate 909 is hinged to one end of a first crank 910. The other end of each first crank 910 is fixedly connected to the blade handle of an inlet guide vane 8 extending outside the installation section 602. Under the circumferential rotation of the first linkage ring 901, each inlet guide vane 8 is driven to rotate with its respective radial central axis as the rotation central axis, realizing the drive adjustment of the inlet guide vane 8;

[0064] The diffuser guide vane bracket 11 includes a second positioning and installation cylinder 1101 with one end open. The other end of the second positioning and installation cylinder 1101 is provided with an annular disc 1102. A circle of pressing flanges 1103 is arranged at the edge of the open end of the second positioning and installation cylinder 1101. The second positioning and installation cylinder 1101 is sleeved in the basic stage test volute 1. The pressing flanges 1103 are installed on the pressing step 1104 arranged on the inner edge of the open side of the basic stage test volute 1. By assembling and pressing the pressing flanges 1103 through the end cover 604 of the inlet guide vane bracket 6 and the open side of the basic stage test volute 1, the installation of the diffuser guide vane bracket 11 is realized;

[0065] The impeller 4 is located in the central hole of the annular disc 1102. The shroud side edge of the outlet of the impeller 4 is in the same axial section as the annular disc 1102. The inner edge of the central hole of the annular disc 1102 is close to but does not contact the shroud side edge of the outlet of the impeller 4; An annular impeller seal 14 is fixedly installed at a position close to the central hole on the inner side of the annular disc 1102. The impeller seal 14 is close to but does not contact the shroud of the impeller 4;

[0066] Diffuser guide vane mounting holes 17 corresponding to a plurality of diffuser guide vanes 12 are formed in the annular disc 1102 of the diffuser guide vane bracket 11. The blade handles of each diffuser guide vane 12 are arranged axially. The blades of each diffuser guide vane 12 are bent radially outward. The inner end of the blade of each diffuser guide vane 12 is vertically fixed to the corresponding blade handle. The blade handle of each diffuser guide vane 12 is installed in the diffuser guide vane mounting hole 17. The blade handle of the diffuser guide vane 12 can rotate in the diffuser guide vane mounting hole 17. The blades of the diffuser guide vane 12 are located outside the annular disc 1102;

[0067] The diffuser guide vane adjusting mechanism 13 includes a second linkage ring 1301. The second linkage ring 1301 is sleeved outside the impeller seal body 14. A plurality of second roller bearings 1302 are evenly distributed at equal diameters on one side of the second linkage ring 1301. A circle of second guide grooves 1303 is formed along the circumference on the outer wall of the impeller seal body 14. The plurality of second roller bearings 1302 are stuck in the second guide grooves 1303 to support the second linkage ring 1301, so that there is no contact between the second linkage ring 1301 and the impeller seal body 14. When the second linkage ring 1301 rotates circumferentially around the impeller seal body 14, the plurality of second roller bearings 1302 move circumferentially in the second guide grooves 1303;

[0068] A linear actuator 1304 is fixedly installed outside the basic stage test volute 1. One end of the linear actuator 1304 is hinged to one end of a second linkage plate 1305. The other end of the second linkage plate 1305 extends into the inlet guide vane shroud 10. The other end of the second linkage plate 1305 is vertically fixedly installed with one end of an axially arranged second drive gear shaft 1306. The other end of the second drive gear shaft 1306 passes through the end cover 604 of the inlet guide vane bracket 6. The end of the other end of the second drive gear shaft 1306 is fixedly installed with a second large gear 1307. The second large gear 1307 meshes with a second arc-shaped rack 1308 concentrically arranged on one side of the second linkage ring 1301, so that the expansion and contraction of the telescopic rod of the linear actuator 1304 drives the circumferential movement of the second linkage ring 1301;

[0069] Drive bar slots 1309 corresponding to the diffuser guide vanes 12 one by one are provided on the second linkage ring 1301. The drive bar slots 1309 penetrate through both sides of the second linkage ring 1301. A drive rod 1310 is clamped in each drive bar slot 1309. One end of each drive rod is vertically fixed to one end of a second crank 1311. The other end of each second crank 1311 is vertically fixedly installed with a leaf stalk of a diffuser guide vane 12 extending into the inner side of the annular disc 1102;

[0070] Under the circumferential rotation of the second linkage ring 1301, the leaf stalks of each diffuser guide vane 12 are driven to rotate around their respective axial center axes, and then the blade angles of each diffuser guide vane 12 are changed, realizing the drive adjustment of the diffuser guide vanes.

[0071] The inlet guide vanes 8 and the diffuser guide vanes 12 are all known components in the art.

[0072] The hinge joint 908 is perpendicular to the linkage plate 909, and the first crank 910 is perpendicular to the leaf stalk of the inlet guide vane 8.

[0073] As a specific solution of this embodiment, the inlet guide vane 7 includes a first positioning and installation cylinder 701 that is fitted and sleeved inside the intake air duct section 601. Inside the first positioning and installation cylinder 701, an inlet streamline head 703 is coaxially arranged and fixed by a rib plate 702.

[0074] Furthermore, multiple inlet guide vanes 8 divide the inlet guide vane bracket 6 into a front intake chamber and a rear intake chamber.

[0075] As a preferred solution of this embodiment, an internal gear sleeve is fixedly arranged at the end of the rotating shaft of the angular travel actuator 904. A first pinion 911 is fixedly arranged at one end of the first driving gear shaft 905, and the first pinion 911 is sleeved inside the internal gear sleeve and meshes with each other, so that the angular travel actuator 904 drives the first driving gear shaft 905 to rotate. The setting of the first pinion 911 makes the whole device easier to disassemble and assemble, and more convenient for maintenance and replacement.

[0076] As a preferred solution of this embodiment, an internal gear hole is arranged at the other end of the second linkage plate 1305. A second pinion 1312 is fixedly arranged at one end of the second driving gear shaft 1306, and the second pinion 1312 is sleeved inside the internal gear hole and meshes with each other, so that the linear travel actuator 1304 drives the second driving gear shaft 1306 to rotate. The setting of the second driving gear shaft 1306 makes the whole device easier to disassemble and assemble, and more convenient for maintenance and replacement.

[0077] As a preferred solution of this embodiment, the first driving gear shaft 905 is installed on the inlet guide vane shroud 10 through a first driving gear shaft support seat 912. The first driving gear shaft 905 is axially arranged and can rotate relative to the first driving gear shaft support seat 912. The first driving gear shaft support seat 912 can make the rotation of the first driving gear shaft 905 more stable.

[0078] As a preferred solution of this embodiment, the second driving gear shaft 1306 is installed on the inlet guide vane bracket 6 through a second driving gear shaft support seat 1313. The second driving gear shaft support seat 1313 is arranged on the outer wall of the flow guiding and contracting cylinder section 603 of the inlet guide vane bracket 6, and the second driving gear shaft 1306 can rotate relative to the second driving gear shaft support seat 1313. The second driving gear shaft support seat 1313 makes the rotation of the second driving gear shaft 1306 more stable.

[0079] As a preferred solution of this embodiment, the hinge joints are all realized by spherical plain bearings 15. The spherical plain bearings 15 make the movement of the hinge points smoother and more stable.

[0080] As a preferred solution of this embodiment, a rolling bearing is installed at the position where the driving rod 1310 contacts the driving strip-shaped groove 1309. The rolling bearing makes the movement of the driving rod 1310 in the driving strip-shaped groove 1309 smoother.

[0081] The main feature of the present invention is to realize the on-line real-time adjustment and precise positioning of the basic stage inlet guide vane 8 through the inlet guide vane adjustment mechanism 9; to realize the on-line real-time adjustment and precise positioning of the diffuser guide vane 12 angle through the diffuser guide vane adjustment mechanism 13; to change the frequency of the motor 20 through the motor frequency conversion system 28 in the centrifugal basic stage closed performance test system, so as to realize the performance test requirements of different speeds / Mach numbers of the basic stage impeller 4.

[0082] When performing the basic stage test with the centrifugal compressor basic stage test device capable of combined adjustment of the present invention, the main operation steps are as follows:

[0083] Step 1, before starting the centrifugal basic stage test device, determine the actuator operation position corresponding to the tested guide vane angle. According to the angles of the inlet guide vane 8 and the diffuser guide vane 12 to be tested, by observing the positions of the pointers of the inlet guide vane angle nameplate and the diffuser guide vane angle nameplate, after confirming that the actuator is adjusted to the pointer indication value as the planned test angle, record the corresponding actuator operation position. Taking the inlet guide vane 8 as an example, record the opening position of the angular travel actuator 904 of the inlet guide vane 8 as follows:

[0084]

[0085] Step 2, adjust the inlet guide vane 8 and the diffuser guide vane 12 to the planned test angles. Under the condition that the regulating valve of the basic stage test system is fully open, start the centrifugal compressor basic stage test device capable of combined adjustment of the present invention and increase the speed to the planned test speed. The basic stage test system is a known conventional basic stage test system, for example, the centrifugal basic stage closed performance test system commonly used in the art. The difference is that the conventional basic stage device in the system is replaced with the centrifugal compressor basic stage test device capable of combined adjustment of the present invention.

[0086] Step 3, at this speed, keep the angles of the inlet guide vane 8 and the diffuser guide vane 12 unchanged and perform the basic stage performance test. By adjusting the opening of the regulating valve of the basic stage test system, operate and collect the operation data of each working condition point in turn from near the choking point to near the surge point, that is, complete the test of a complete performance curve of the basic stage. For the measurement method and data acquisition method, refer to the known relevant mature literature and industry standards.

[0087] Step 4: Keep the rotational speed and the angle of the diffuser guide vane 12 unchanged. Adjust the angle of the inlet guide vane 8 to a new angle value through the angular travel actuator 904 of the inlet guide vane 8, and repeat the operation process of Step 3 to complete the test of another complete performance curve of the basic stage. According to the inlet guide vane angle values planned for the basic stage test, sequentially adjust the opening degree of the angular travel actuator 904 of the inlet guide vane 8 to complete the corresponding performance curve test. Thus, the test of the performance curves of the basic stage with a set of different inlet guide vane angles is completed at a specific rotational speed and diffuser guide vane angle.

[0088] Step 5: Keep the rotational speed unchanged. Adjust the angle of the diffuser guide vane to a new angle value through the linear travel actuator 1304 of the diffuser guide vane 12, and repeat the operation processes of Step 3 and Step 4 to complete the test of the performance curves of the basic stage with a set of different inlet guide vane angles at a specific rotational speed and a new diffuser guide vane angle. According to the diffuser guide vane angle values planned for the basic stage test, sequentially adjust the opening degree of the diffuser guide vane actuator to complete the corresponding performance curve test. Thus, the test of the performance curves of the basic stage with different inlet guide vane angles at different diffuser guide vane angles at a specific rotational speed is completed.

[0089] Step 6: According to the rotational speed values planned for the basic stage test, through the variable speed system, sequentially adjust the rotational speed of the basic stage test machine to the new planned test rotational speeds, and repeat Steps 2, 3, 4, and 5 to complete the test of the performance curves of the basic stage with different diffuser guide vane angles and different inlet guide vane angles at each rotational speed.

[0090] It should be specifically noted that: at each test operating condition point, the basic stage test system generally operates stably for about 15 minutes after the flow rate adjustment is completed. Wait until the pressure and temperature values at each measuring point tend to be constant, and then data acquisition can be carried out to reduce the fluctuation error of the test data.

[0091] Application example:

[0092] For the performance test work of a semi-open basic stage of Shaanxi Blower (Group) Co., Ltd., the combined regulating device and combined test method provided by the present invention are adopted, and a set of centrifugal basic stage closed performance test systems is used, as Figure 12 shown. The test is carried out according to the combined adjustment method of the inlet guide vane angle, diffuser vane angle, and rotational speed. A total of 5 rotational speeds, 7 inlet guide vane angles, and 4 diffuser guide vane angles are executed, and a total of 160 basic stage performance curve tests are carried out.

[0093] The test results of the basic stage performance meet the expectations. By adopting the combined regulating device and combined test method provided by the present invention, the work efficiency and bench utilization rate of the basic stage performance test are improved, the manufacturing cost and labor time cost of the basic stage performance test are reduced, the test accuracy is improved, and at the same time, combined with the closed performance test device, on the one hand, the test conditions are stabilized, and on the other hand, it is beneficial to reduce the test noise and the impact of the noise on the test personnel and the surrounding environment.

Claims

1. A basic stage test device for a centrifugal compressor capable of combined adjustment, comprising a basic stage test volute (1) with one side open and the other side closed. A volute chamber (2) is provided on the circumferential inner wall of the basic stage test volute (1), and an exhaust air duct (3) communicating with the volute chamber (2) is provided on the volute chamber (2); an impeller (4) is arranged in the basic stage test volute (1), the inlet of the impeller (4) faces the open side of the basic stage test volute (1), the outlet of the impeller (4) faces the volute chamber (2), and the impeller (4) is driven to rotate by an impeller drive main shaft (5) extending outside the closed side of the basic stage test volute (1). It is characterized in that: An inlet guide vane bracket (6) is installed on the open side of the basic stage test volute (1). An inlet flow deflector (7) is installed in the inlet guide vane bracket (6). A plurality of inlet guide vanes (8) are installed radially in the inlet guide vane bracket (6). The blade shafts of the inlet guide vanes (8) are radially outward, and the blades of the inlet guide vanes (8) are radially inward. The blade shafts of the inlet guide vanes (8) pass through inlet guide vane mounting holes (16) opened on the inlet guide vane bracket (6) and extend outside the inlet guide vane bracket (6). The inlet guide vanes (8) are driven and adjusted by an inlet guide vane adjusting mechanism (9); A diffuser guide vane bracket (11) is installed in the basic stage test volute (1). A plurality of diffuser guide vanes (12) are installed on the diffuser guide vane bracket (11). The diffuser guide vanes (12) are driven and adjusted by a diffuser guide vane adjusting mechanism (13); The inlet guide vane bracket (6) includes an air inlet duct section (601), a mounting section (602), and a diffuser contraction cylinder section (603) which are integrally arranged in sequence. The open end of the diffuser contraction cylinder section (603) that contracts is close to but does not touch the edge of the impeller shroud side impeller seal body (14) of the impeller (4). An end cover (604) is provided on the outer wall of the diffuser contraction cylinder section (603). The end cover (604) is installed on the open side of the basic stage test volute (1) so that the entire inlet guide vane bracket (6) is installed on the open side of the basic stage test volute (1); The inlet guide vane adjusting mechanism (9) includes a first linkage ring (901). The first linkage ring (901) is sleeved outside the mounting section (602). A plurality of first roller bearings (902) are evenly distributed at equal diameters on one side of the first linkage ring (901). A first guide rail groove (903) is circumferentially opened on the outer wall of the mounting section (602). The plurality of first roller bearings (902) are stuck in the first guide rail groove (903) to support the first linkage ring (901), so that there is no contact between the first linkage ring (901) and the mounting section (602). When the first linkage ring (901) rotates circumferentially around the mounting section (602), the plurality of first roller bearings (902) move circumferentially in the first guide rail groove (903); An inlet guide vane shroud (10) sleeving outside the installation section (602) is arranged outside the first linkage ring (901). An angular travel actuator (904) is fixedly installed on the inlet guide vane shroud (10). One end of a rotating shaft of the angular travel actuator (904) is connected to one end of a first drive gear shaft (905) extending outside the inlet guide vane shroud (10) to drive the first drive gear shaft (905) to rotate. A first large gear (906) is fixedly installed at the other end of the first drive gear shaft (905). The first large gear (906) meshes with a first arc-shaped rack (907) concentrically arranged on the other side of the first linkage ring (901), so that the rotation of the rotating shaft of the angular travel actuator (904) drives the circumferential movement of the first linkage ring (901). Hinge joints (908) corresponding to a plurality of inlet guide vanes (8) one by one are evenly arranged along the radial direction outward at the outer edge of the first linkage ring (901). One end of each hinge joint (908) is hinged to one end of a first linkage plate (909). The other end of each first linkage plate (909) is hinged to one end of a first crank (910). The other end of each first crank (910) is fixedly connected to the leaf stalk of an inlet guide vane (8) extending outside the installation section (602). Under the circumferential rotation of the first linkage ring (901), each inlet guide vane (8) is driven to rotate around its respective radial central axis, realizing the drive adjustment of the inlet guide vane (8). The diffuser vane bracket (11) includes a second positioning and installation cylinder (1101) with one end open. An annular disc (1102) is arranged at the other end of the second positioning and installation cylinder (1101). A circle of pressing flanges (1103) is arranged at the edge of the open end of the second positioning and installation cylinder (1101). The second positioning and installation cylinder (1101) is sleeved in the basic stage test volute (1). The pressing flanges (1103) are installed on a pressing step (1104) arranged at the inner edge of the open side of the basic stage test volute (1). The pressing flanges (1103) are pressed through the assembly of the end cover (604) of the inlet guide vane bracket (6) and the open side of the basic stage test volute (1), realizing the installation of the diffuser vane bracket (11). The impeller (4) is located in the central hole of the annular disc (1102). The edge of the shroud side of the outlet of the impeller (4) is in the same axial section as the annular disc (1102). The inner edge of the central hole of the annular disc (1102) is close to but does not contact the edge of the shroud side of the outlet of the impeller (4). An annular impeller seal (14) is fixedly installed at a position close to the central hole on the inner side of the annular disc (1102). The impeller seal (14) is close to but does not contact the shroud of the impeller (4). On the annular disk (1102) of the diffuser guide vane bracket (11) described above, diffuser guide vane mounting holes (17) corresponding to a plurality of diffuser guide vanes (12) are provided. The leaf stalks of each diffuser guide vane (12) are arranged axially, the blades of each diffuser guide vane (12) are bent radially outward, the inner ends of the blades of each diffuser guide vane (12) are vertically fixed on the corresponding leaf stalks, the leaf stalks of each diffuser guide vane (12) are installed in the diffuser guide vane mounting holes (17), the leaf stalks of the diffuser guide vanes (12) can rotate in the diffuser guide vane mounting holes (17), and the blades of the diffuser guide vanes (12) are located outside the annular disk (1102). The described diffuser guide vane adjusting mechanism (13) includes a second linkage ring (1301). The second linkage ring (1301) is sleeved outside the impeller seal body (14). A plurality of second roller bearings (1302) are evenly distributed and installed on one side of the second linkage ring (1301) with equal diameters. A circle of second guide grooves (1303) is provided along the circumferential direction on the outer wall of the impeller seal body (14). The plurality of second roller bearings (1302) are stuck in the second guide grooves (1303) to support the second linkage ring (1301), so that there is no contact between the second linkage ring (1301) and the impeller seal body (14). When the second linkage ring (1301) rotates circumferentially around the impeller seal body (14), the plurality of second roller bearings (1302) move circumferentially in the second guide grooves (1303). A linear actuator (1304) is fixedly installed outside the basic stage test volute (1). One end of the linear actuator (1304) is hinged to one end of a second linkage plate (1305). The other end of the second linkage plate (1305) extends into the inlet guide vane shroud (10). One end of an axially arranged second drive gear shaft (1306) is vertically and fixedly installed at the other end of the second linkage plate (1305). The other end of the second drive gear shaft (1306) passes through the end cover (604) of the inlet guide vane bracket (6). A second large gear (1307) is fixedly installed at the end of the other end of the second drive gear shaft (1306). The second large gear (1307) meshes with a second arc-shaped rack (1308) concentrically arranged on one side of the second linkage ring (1301), so that the expansion and contraction of the telescopic rod of the linear actuator (1304) drives the circumferential movement of the second linkage ring (1301). Drive bar-shaped grooves (1309) corresponding to the diffuser guide vanes (12) are provided on the second linkage ring (1301). The drive bar-shaped grooves (1309) penetrate through both sides of the second linkage ring (1301). A drive rod (1310) is clamped in each drive bar-shaped groove (1309). One end of each drive rod is vertically fixed to one end of a second crank (1311). The other end of each second crank (1311) is vertically and fixedly installed with the leaf stalk of a diffuser guide vane (12) extending into the inner side of the annular disk (1102). Under the circumferential rotation of the second linkage ring (1301), the petiole of each diffuser vane (12) is driven to rotate around its respective axial central axis, thereby driving the change of the blade angle of each diffuser vane (12) to achieve the drive adjustment of the diffuser vane.

2. The combined adjustable centrifugal compressor basic stage test device according to claim 1, characterized in that, The described inlet guide vane (7) includes a first positioning and installation cylinder (701) fitted and sleeved inside the intake air duct section (601), and an inlet streamline head (703) is coaxially fixed inside the first positioning and installation cylinder (701) through a rib plate (702).

3. The basic stage test device of a centrifugal compressor capable of combined adjustment according to claim 1, characterized in that, An internal gear sleeve is fixedly arranged at the end of the rotating shaft of the described angular travel actuator (904), and a first pinion (911) is fixedly arranged at one end of the first drive gear shaft (905). The first pinion (911) is sleeved inside the internal gear sleeve and meshes with each other, so that the angular travel actuator (904) drives the first drive gear shaft (905) to rotate.

4. The basic stage test device for a centrifugal compressor capable of combined adjustment as described in claim 1, wherein An internal gear hole is arranged at the other end of the described second linkage plate (1305), and a second pinion (1312) is fixedly arranged at one end of the second drive gear shaft (1306). The second pinion (1312) is sleeved inside the internal gear hole and meshes with each other, so that the linear travel actuator (1304) drives the second drive gear shaft (1306) to rotate.

5. The combined adjustable centrifugal compressor basic stage test device according to claim 1, characterized in that The described first drive gear shaft (905) is installed on the inlet vane shroud (10) through a first drive gear shaft support seat (912), and the first drive gear shaft (905) is axially arranged and can rotate relative to the first drive gear shaft support seat.

6. The basic stage test device of a centrifugal compressor capable of combined adjustment according to claim 1, characterized in that The described second drive gear shaft (1306) is installed on the inlet vane bracket (6) through a second drive gear shaft support seat (1313). The second drive gear shaft support seat (1313) is arranged on the outer wall of the flow guiding and contracting cylinder section (603) of the inlet vane bracket (6), and the second drive gear shaft (1306) can rotate relative to the second drive gear shaft support seat (1313).

7. The basic stage test device of a centrifugal compressor capable of combined adjustment according to claim 1, characterized in that, All the hinges are realized by using spherical plain bearings (15).

8. The basic stage test device of a centrifugal compressor capable of combined adjustment according to claim 1, characterized in that, A rolling bearing is installed at the position where the drive rod (1310) contacts the drive strip groove (1309).

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