A diffuser and compressor

Abstract

This utility model discloses a diffuser, relating to the field of compressor technology. The diffuser includes an adjustable blade assembly, which comprises a driving blade assembly, a central transmission component connected to the driving blade assembly, and multiple driven blade assemblies connected to the central transmission component. Both the driving and driven blade assemblies include blades. The diffuser has a first oil chamber and a second oil chamber. The driving blade assembly also includes a driving protrusion. The first and second oil chambers are located on opposite sides of the driving protrusion. When both oil chambers are filled with hydraulic oil and the oil pressure is the same, the driving blade assembly is stationary. When the oil pressure in one oil chamber is greater than that in the other, the driving blade assembly rotates. This utility model solves the technical problem of the large installation space required for diffusers in existing equipment. The diffuser and compressor of this utility model have the advantage of compact structure and are suitable for use in compressed air energy storage systems.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a diffuser and a compressor. Background Technology

[0002] Because energy storage systems need to adapt to grid load fluctuations, the compressors used within these systems require frequent start-ups, shutdowns, and load adjustments. This places higher demands on the performance of the compressors used in energy storage systems. Compressors used in energy storage systems typically employ adjustable diffusers between two impeller stages to change the direction and flow area of ​​the airflow at the compressor impeller outlet, thereby altering the airflow velocity and direction at the inlet of the next stage impeller.

[0003] In existing technologies, the drive device for adjusting the blade direction on a diffuser often employs a motor drive combined with a linkage mechanism. In developing this invention, the inventors discovered at least the following problems with the existing technology: the linkage mechanism occupies a large space, resulting in a complex structure for the adjustable blade drive device. Especially for multi-stage compressors commonly used in large energy storage systems, the blade drive device adjusted via the linkage mechanism is almost impossible to install at the intermediate stage impeller of the compressor due to the large size of the externally mounted linkage. Summary of the Invention

[0004] The purpose of this invention is to provide a diffuser that requires little installation space.

[0005] To achieve this objective, a diffuser is provided, comprising an adjustable blade assembly, which includes an active blade assembly and multiple driven blade assemblies. Both the active and driven blade assemblies include blades. The diffuser contains a first oil chamber and a second oil chamber. The active blade assembly also includes a drive protrusion. The first and second oil chambers are located on opposite sides of the drive protrusion. When both oil chambers are filled with hydraulic oil and the oil pressure is the same, the active blade assembly remains stationary. When the oil pressure in one oil chamber is greater than the oil pressure in the other oil chamber, the active blade assembly rotates. The rotation of the active blade assembly drives the driven blade assemblies to rotate, thereby causing all the blades of the adjustable blade assembly to rotate together.

[0006] Furthermore, it includes an inner cover plate and a partition plate. The partition plate has an inner cover plate mounting part at a position corresponding to the inner cover plate. After the inner cover plate and the inner cover plate mounting part are sealed together, they form a closed oil cavity. The driving protrusion is disposed in the oil cavity and divides the oil cavity into a first oil cavity and a second oil cavity that are independent of each other.

[0007] Furthermore, a fixing protrusion is also provided in the oil cavity. The bottom of the fixing protrusion is fixed in the groove of the oil cavity. After the inner cover plate is connected to the inner cover plate mounting part, the top surface of the fixing protrusion is sealed to the side of the inner cover plate near the oil cavity. The first oil cavity is formed between the left side of the fixing protrusion and the driving protrusion, and the second oil cavity is formed between the right side of the fixing protrusion and the driving protrusion.

[0008] Furthermore, the drive protrusion is fixedly connected to the side of the inner cover plate near the oil cavity.

[0009] Furthermore, the active blade assembly also includes a rotating shaft that passes through a through hole in the inner cover plate, the drive protrusion is fixed on the rotating shaft, and the rotating shaft is rotatable relative to the inner cover plate.

[0010] Furthermore, the bottom of the oil cavity is provided with a shaft hole for supporting the central rotating shaft of the active blade assembly, and the rotating shaft is rotatably connected to the shaft hole.

[0011] Furthermore, the driving bump is a 1 / 2 annular bump, and the fixing bump is a 1 / 4 annular bump.

[0012] Furthermore, the partition is provided with a first hydraulic flow channel for supplying hydraulic oil to the first oil chamber and a second hydraulic flow channel for supplying hydraulic oil to the second oil chamber. The first hydraulic flow channel and the second hydraulic flow channel are independent of each other. The partition is provided with a first oil injection hole for injecting oil into the first hydraulic flow channel and a second oil injection hole for injecting oil into the second hydraulic flow channel.

[0013] Furthermore, the oil inlet connecting the first hydraulic flow channel and the first oil chamber is a semi-circular hole, and the oil inlet connecting the second hydraulic flow channel and the second oil chamber is a semi-circular hole.

[0014] On the other hand, a compressor is also provided, including the diffuser described in any of the above claims, wherein the diffuser is disposed at the outlet of the impeller.

[0015] One of the above technical solutions has the following advantages or beneficial effects: The hydraulically driven structure is located inside the diffuser and includes a first oil chamber and a second oil chamber. The active blade assembly also includes a drive protrusion. The first oil chamber and the second oil chamber are located on both sides of the drive protrusion. When both oil chambers are filled with hydraulic oil and the oil pressure is the same, the active blade assembly is stationary. When the oil pressure in one oil chamber is greater than the oil pressure in the other oil chamber, the active blade assembly rotates, thereby driving the driven blade assembly to rotate, so that all the blades of the adjustable blade assembly rotate together.

[0016] This solution uses hydraulic drive to drive the active blade assembly. The hydraulic drive structure is located inside the diffuser. By injecting oil into the first and second oil chambers within the diffuser through hydraulic pipes, the active blade assembly can be driven to rotate, thereby driving all the blades to rotate. Therefore, the blade transmission structure of this application is located inside the diffuser, and there is no additional transmission mechanism outside the diffuser, reducing the external size of the diffuser and the installation space required for the diffuser. Attached Figure Description

[0017] Figure 1 The structure of the diffuser inlet side is shown; Figure 2 The structure of the diffuser exhaust side is shown; Figure 3 This is a schematic diagram of an explosion of a diffuser; Figure 4 This is a structural schematic diagram of the exhaust side of the partition; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the adjustable blade structure; Figure 7 This is a schematic diagram of the active blade assembly. Figure 8 This is a schematic diagram of the components of the driven blade assembly; Figure 9 for Figure 6 A magnified view of a section at point B in the middle; Figure 10 Front view of the diffuser exhaust side; Figure 11 for Figure 10 Sectional view at point AA; Figure 12 for Figure 11 A magnified view of the area circled in the middle; Figure 13 for Figure 12 Sectional view at point BB; Figure 14 for Figure 10 Sectional view at point BB.

[0018] In the diagram: 10-partition; 11-intake ring groove; 12-side wall; 13-annular boss; 14-annular recess; 15-conical channel; 16-inner cover plate mounting part; 17-fixing protrusion; 18-shaft hole; 20-center hole; 30-outer cover plate; 40-adjustable blade; 41-center transmission component / center gear ring; 421-drive blade assembly; 422-driven blade assembly; 43-rotating shaft; 44-blade transmission component / blade gear; 45-drive protrusion; 46-blade; 47-sealing ring; 51-inner... Side cover plate; 521-First oil injection hole; 522-Second oil injection hole; 53-Oil cavity section; 531-First oil cavity; 532-Second oil cavity; 542-Second hydraulic flow channel; 551-First oil injection hole; 552-Second oil injection hole; 541-First hydraulic flow channel; 5411-Vertical section of the first hydraulic flow channel; 5412-Inclined section of the first hydraulic flow channel; 5413-Horizontal section of the first hydraulic flow channel; 5414-Welded sealing point of the first hydraulic flow channel; 5424-Welded sealing point of the second hydraulic flow channel. Detailed Implementation

[0019] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] This embodiment uses the adjustable blade drive device applied to the diffuser of a compressor as an example for illustration.

[0021] The diffuser is installed at the outlet of the impeller inside the compressor. When the compressor is working, gas is drawn into the compressor's intake chamber and then enters the first-stage impeller and diffuser, and then enters the second-stage impeller. Therefore, the side where the diffuser connects to the impeller outlet is called the diffuser's intake side, and the other side is called the diffuser's exhaust side. Figure 1 The structure of the diffuser inlet side is shown. Figure 2 The structure of the diffuser exhaust side is shown. Figure 3 This is a schematic diagram of a diffuser explosion. (Example:) Figure 3 The diffuser includes a diaphragm 10, an adjustable blade assembly 40 mounted on the diaphragm, and an adjustable blade drive device for adjusting the direction of the adjustable blades. The diffuser is connected to the outlet of the impeller via the diaphragm 10. The intake side of the diffuser is also the intake side of the diaphragm, and the exhaust side of the diffuser is also the exhaust side of the diaphragm.

[0022] Optionally, in a multi-stage compressor, a diffuser can be installed at the outlet of each impeller stage. The inlet side of the diaphragm forms a gas flow channel with the outlet of the impeller of the same stage, and the exhaust side of the diaphragm also forms a gas flow channel with the inlet of the next stage impeller. In a multi-stage centrifugal compressor, the gas flow channel between two impeller stages consists of a diffuser and a 180° bend. The diffuser is located at the outlet of the impeller of the same stage. After the gas is guided and diffused by the diffuser, it enters the bend and flows into the gas inlet of the next stage impeller.

[0023] like Figure 1 In this embodiment, the air intake side of the baffle 10 has an annular air intake groove 11, which is formed on the sidewall 12 extending from the exhaust side to the air intake side around the baffle. The air intake groove 11 is part of the compressor intake chamber and serves as a guide. A central hole 20 is provided at the central axis of the baffle, penetrating both the air intake and exhaust sides of the baffle, for housing the compressor rotor. The space between the outer diameter of the rotor and the inner diameter of the central hole forms a flow channel. After entering the compressor intake chamber, the airflow first passes through the air intake groove 11 of the baffle, then enters the flow channel at the central hole 20 of the baffle, and finally enters the inlet of the next stage impeller.

[0024] Figures 2-4 This is a schematic diagram of the exhaust side of the baffle. The exhaust side of the baffle has an annular boss 13, inside which is an annular recess 14. Both the annular boss 13 and the annular recess 14 are arranged from the outside to the inside around the central hole, and are connected by a smooth curved surface. The annular recess 14 is an open, concave cavity. An adjustable blade assembly 40 is disposed within the concave cavity of the annular recess. After assembly, the openness of the annular recess 14 is closed by an outer cover plate 30. The annular recess 14 is connected to the central hole 20 via a tapered channel 15. The end of the tapered channel 15 with a larger opening diameter connects to the inner edge of the annular recess 14, and the end of the tapered channel 15 with a smaller opening diameter connects to the central hole. The tapered channel 15 communicates with the central hole 20.

[0025] Figure 6 This is a schematic diagram of the adjustable blade structure. Figure 9 for Figure 6 A magnified view of section B. The adjustable blade assembly 40 includes a central drive component 41 and multiple blade assemblies. The central drive component 41 drives the blade drive component 44 of each blade assembly to rotate. The blade drive component 44 is sleeved on a rotating shaft 43, one end of which is located within the shaft hole 18 of the annular recess 14, and the shaft rotates within the shaft hole. Figures 7-8 and Figures 3-4 As shown, one end of the rotating shaft 43 is fixedly connected to the blade 46, and the other end is inserted into the shaft hole 18 of the diaphragm 10 in the diffuser. Optionally, the shaft hole in the diaphragm is a blind hole. The number of shaft holes 18 is the same as the number of blade assemblies.

[0026] Of the multiple blade assemblies, one is the driving blade assembly, and the rest are driven blade assemblies. Both the driving and driven blade assemblies include blades 46, a rotating shaft 43 fixed to the blades, and a blade drive component 44 that cooperates with the central drive component. The blades 46 and the blade drive component 44 are fixed to the rotating shaft 43 one after the other. Figure 7 This is a schematic diagram of the active blade assembly. Figure 8 This is a schematic diagram of the components of the driven blade assembly.

[0027] The difference between the active blade assembly 421 and the driven blade assembly 422 is that the active blade assembly 421 drives the central transmission member 41 to rotate, and the rotation of the central transmission member 41 drives the driven blade assembly 422 to rotate, thereby realizing that the gear ring drives multiple blade assemblies to rotate around its own axis. Figure 7 and Figure 9 As shown, the active blade assembly includes a drive protrusion 45, which is fixed to the rotating shaft 43 and located at the end of the blade drive member 44 away from the blade 46. The drive protrusion 45 is part of an adjustable blade drive device, through which the active blade assembly 421 is driven.

[0028] like Figure 6 As shown, the central drive component 41 and the blade drive component 44 are connected by gears. The central drive component is a central gear ring 41, and the blade drive component 44 is a blade gear, which is located outside the rotating shaft and fixedly connected to it. In use, the rotation of the driving blade assembly 421 drives the rotation of the central gear ring 41, which in turn drives the rotation of the driven blade assembly 422, thereby enabling the blades 46 of multiple blade assemblies to rotate around their own rotating shafts. Optionally, the drive component and the blade assembly can also be connected by a belt drive. The drive component is a large conveyor belt, and each blade assembly includes a blade conveyor belt, which is located outside the rotating shaft and fixedly connected to it. In use, the rotation of the driving blade assembly drives the large conveyor belt, which in turn drives the rotation of other blade assemblies, thereby enabling multiple blade assemblies to rotate around their own rotating shafts.

[0029] like Figures 10-14 As shown, in this embodiment, the adjustable blade drive device uses hydraulic drive to adjust the rotation angle of the active blade assembly 421. The rotation of the active blade assembly 421 drives the central transmission component 41 to rotate, and the rotation of the central transmission component 41 drives other driven blade assemblies 422 to rotate, so that multiple blades rotate around their own axes, thereby enabling the adjustable blade drive device to adjust the rotation angle of all blades 46.

[0030] like Figure 6 and Figure 9As shown, the adjustable blade drive device includes an inner cover plate 51, which is disposed on the active blade assembly, located between the drive protrusion 45 and the blade transmission component 44 of the active blade assembly. The sidewall of the inner cover plate 51 is adjacent to and fixedly connected to the sidewall of the drive protrusion 45. The inner cover plate 51 has a through hole in its center, through which the rotating shaft of the active blade assembly passes. The rotating shaft 43 of the active blade assembly 421 is a rotating component, driving the drive protrusion 45 to rotate. The inner cover plate 51 is a stationary component; therefore, a sealing element is provided between the inner cover plate 51 and the rotating shaft 43. Optionally, as... Figure 12 The sealing element uses a 47 sealing ring.

[0031] Figure 5 for Figure 4 A magnified view of a portion of point A, as shown below. Figures 4-9 An inner cover mounting portion 16 is located on the partition plate corresponding to the inner cover plate 51. The inner cover mounting portion 16 matches the shape of the inner cover plate 51, and a groove-shaped oil cavity portion 53 is provided inside the inner cover plate mounting portion 16. After the inner cover plate 51 is fixed to the inner cover plate mounting portion 16, a closed oil cavity portion 53 is formed. A fixing protrusion 17 that cooperates with the driving protrusion 45 is provided inside the oil cavity portion 53. The fixing protrusion 17 is generally fan-shaped, and its bottom is fixed in the groove of the oil cavity portion 53. After the inner cover plate 51 is connected, the top surface of the fixing protrusion 17 is sealed to the side of the inner cover plate 51 near the oil cavity portion.

[0032] The first oil cavity 531 and the second oil cavity 532 are respectively formed in the cavity separated by the driving protrusion 45 and the fixed protrusion 17. The volume of the oil cavity portion 53 is greater than the sum of the volumes of the driving protrusion 45 and the fixed protrusion 17. After the inner cover plate 51 is fixed to the inner cover plate mounting portion 16, the driving protrusion 45 is located in the groove of the oil cavity portion and is located on the same plane as the fixed protrusion 17. The end of the driving protrusion 45 away from the inner cover plate 51 is fitted with a small clearance to the bottom of the groove of the oil cavity portion 53, and the end face of the fixed protrusion 17 is sealed to the inner cover plate 51. The driving protrusion 45 is located in the groove of the oil cavity portion and is staggered from the fixed protrusion 17. The side of the driving protrusion 45 and the side adjacent to the fixed protrusion 17 form the first oil cavity 531, and the other side of the driving protrusion 45 and the side adjacent to the fixed protrusion 17 form the second oil cavity 532. After the inner cover plate 51 and the inner cover plate mounting part 16 are assembled, the first oil chamber 531 and the second oil chamber 532 are two independent oil chambers.

[0033] The bottom of the oil cavity 53 is provided with a shaft hole for supporting the central rotating shaft of the active blade assembly. The rotating shaft of the active blade assembly rotates in the shaft hole. The shaft hole is a blind hole. The rotating shaft is rotatably connected to the shaft hole. Optionally, the rotating shaft and the shaft hole can be connected by a bushing.

[0034] like Figures 10-14As shown, the volume design of the first oil chamber 531 and the second oil chamber 532 is related to the rotation angle of the blades. The volumes of the driving protrusion and the fixed protrusion are determined based on the sum of the volumes of the first and second oil chambers, while the rotation angle of the blades is related to the parameters of the compressor. Optionally, the fixed protrusion of the oil chamber is a 1 / 4 cylindrical protrusion, and the driving protrusion of the active blade assembly is a 1 / 2 cylindrical protrusion. After the inner cover plate is fixed to the inner cover plate mounting part, the total volume of the driving protrusion and the fixed protrusion occupies 3 / 4 of the total space of the oil chamber, and the remaining 1 / 4 space is the sum of the volumes of the first and second oil chambers. At this time, the maximum rotation angle of the driving protrusion 45 of the active blade assembly is 45°. Since the height of the first and second oil chambers is the same, the volume of the first and second oil chambers can be described by the bottom area of ​​the first and second oil chambers, such as... Figure 13 The rotating shaft 43 of the active blade assembly 421 divides the oil cavity portion 53 of the inner cover plate mounting portion 16 into an annular cavity. Inside, the driving protrusion 45 is a 1 / 2 annular body, the fixed protrusion 17 is a 1 / 4 annular body, and the remaining annular cavity is the sum of the areas of the first oil cavity and the second oil cavity. However, the first oil cavity and the second oil cavity are respectively located on both sides of the fixed protrusion 17.

[0035] In use, both the first and second oil chambers are filled with hydraulic oil. The rotation angle of the drive protrusion 45 is controlled by adjusting the pressure difference between the hydraulic oil in the first and second oil chambers, thereby driving the rotation of the blade transmission component 44 on the active blade assembly, which in turn drives the central transmission component 41 to rotate, and ultimately drives all the blades to rotate. Figures 10-14 As shown, the hydraulic oil circuit for injecting oil into the first oil chamber and the second oil chamber is an internal flow channel opened inside the partition. The hydraulic oil system supplies oil to the first oil chamber 531 and the second oil chamber 532 through the oil pipe and oil pump.

[0036] like Figures 10-11 The flow channel for supplying hydraulic oil to the first oil chamber 531 is the first hydraulic flow channel 541, such as... Figure 10 and Figure 14 The flow channel for supplying hydraulic oil to the second oil chamber 532 is the second hydraulic flow channel 542. Both the first and second hydraulic flow channels are located inside the partition. The first and second hydraulic flow channels are two independent channels. The first hydraulic flow channel 541 communicates with the first oil chamber 531, and the second hydraulic flow channel 542 communicates with the second oil chamber 532. The partition is provided with a first oil injection hole and a second oil injection hole. The first oil injection hole connects the first hydraulic flow channel to the oil pipe and pump of the hydraulic oil system, and the second oil injection hole connects the second hydraulic flow channel to the oil pipe and pump. The oil pump of the hydraulic oil system does not need to be installed on the diffuser and can be located outside the compressor. The oil pipe of the hydraulic oil system is connected to both the first and second oil injection holes. Figure 2 Both the first oil injection hole 521 and the second oil injection hole 522 can be located on the peripheral sidewall of the partition.

[0037] like Figures 10-14 As shown, the oil inlet connecting the hydraulic flow channel and the oil chamber can be located on the drive protrusion and / or the fixed protrusion. Optionally, as... Figure 13 The oil inlets connecting the hydraulic channels 541 / 542 and the oil chambers 531 / 532 are located on both sides of the fixed protrusion 17. Optionally, the oil inlet connecting the first hydraulic channel 541 and the first oil chamber 531 is located on one side of the fixed protrusion, and the oil inlet connecting the second hydraulic channel 542 and the second oil chamber 532 is located on the other side of the fixed protrusion. Optionally, the oil inlet connecting the first hydraulic channel 541 and the first oil chamber 531 is a semi-circular hole, and the oil inlet connecting the second hydraulic channel 542 and the second oil chamber 532 is a semi-circular hole.

[0038] like Figures 10-14 As shown, the first hydraulic flow channel and the second hydraulic flow channel are set at a certain angle. Figure 11 and Figure 14 Both the first and second hydraulic flow channels include vertical, inclined, and horizontal sections, with the oil injection holes of the hydraulic flow channels located on the sidewalls of the partitions. The hydraulic oil flows from the injection holes into the partition via a vertical flow channel, while the flow channel into the oil chamber uses a horizontal flow channel. The inclined section connects the vertical and horizontal flow channels. After numerous trials, the inventors have determined that the above-mentioned flow channel design offers the best manufacturability. During machining, the inclined section of the hydraulic flow channel can be machined from the vent side of the partition, and the vertical section can be machined from the periphery of the partition. After the vertical and inclined sections are connected, the inclined section between the vent side partition inlet and the vertical section is welded and sealed. The horizontal section of the hydraulic flow channel can be machined starting from the fixing protrusion at the inner cover mounting part.

[0039] like Figures 10-14 The diagram shows the vertical section 5411, the inclined section 5412, and the horizontal section 5413 of the first hydraulic flow channel 541. The structure of the second hydraulic flow channel 542 is the same as that of the first hydraulic flow channel 541. For ease of processing, the inclined sections of the first hydraulic flow channel 541 and the second hydraulic flow channel 542 are first processed from the exhaust side of the partition 10, connecting the inclined sections to their respective vertical sections. Then, the inclined sections are welded and sealed from the exhaust side of the partition, forming the hydraulic flow channels. Figure 11 and Figure 14 The welded sealing point 5414 of the first hydraulic flow channel inclined section and the welded sealing point 5424 of the second hydraulic flow channel inclined section are shown.

[0040] In this embodiment of the adjustable blade drive device, when both oil chambers are filled with hydraulic oil and the oil pressure is the same, the active blade assembly is stationary; when the oil pressure in one oil chamber is greater than the oil pressure in the other oil chamber, the active blade assembly rotates.

[0041] Optionally, hydraulic oil enters through the first injection port 551 and the second injection port 552. Hydraulic oil injected through the first injection port 551 enters the first oil chamber 531 via the first hydraulic flow channel 541, and hydraulic oil injected through the second injection port 552 enters the second oil chamber 532 via the second hydraulic flow channel 542. When both oil chambers are simultaneously filled with hydraulic oil and the oil pressure is the same, the pressure on both sides of the drive protrusion 45 is the same, and the shaft vane gear 44 of the active vane assembly does not rotate. Increasing the oil pressure in the first or second oil chamber causes the shaft of the active vane assembly and the shaft vane gear 44 to rotate in the direction of lower oil pressure. Since hydraulic oil is an incompressible fluid, by controlling the flow rate of the oil holes on both sides of the fixed protrusion 17 within the oil chamber, precise control of the rotation angle of the drive protrusion 45 of the active vane assembly can be achieved. The rotation of the drive protrusion 45 drives the fixed shaft 43 and the shaft vane gear 44 to rotate with precise control of their rotation angle. Before use, the flow rate of the hydraulic oil and the rotation angle of the drive protrusion 45 can be calibrated. Through the above process, the pressure of the hydraulic oil is converted into the power to rotate the blade gear 44 of the active blade assembly, which in turn drives the rotation of the blade transmission component 44 (blade gear), ultimately realizing the rotation of the driven blade assembly. Since the blade transmission component 44 on the adjustable blade assembly 40 is fixedly connected to the blades 46, the rotation of the blade assembly causes all the blades 46 to rotate around their own axes.

[0042] like Figures 10-14 As shown, when the oil pressure in the first oil chamber and the second oil chamber are the same, the active blade assembly does not rotate. Increasing the oil pressure in the first oil chamber 531 causes the shaft of the active blade assembly and the shaft-blade gear 44 to rotate counterclockwise. Conversely, increasing the oil pressure in the second oil chamber 532 causes the shaft of the active blade assembly and the shaft-blade gear 44 to rotate clockwise. In this embodiment, as... Figure 12 In both clockwise and counterclockwise directions, the rotation angle of the drive protrusion 45 of the active blade assembly is 45°.

[0043] In existing technologies, adjustable blade drive devices often employ a combination of motor drive and linkage mechanism transmission. Linkage mechanisms occupy a large space and complicate the structure of the adjustable blade drive device. For multi-stage centrifugal compressors, if a motor drive is used, gears, linkages, or other structures must be used to mechanically connect the motor and blades for power transmission. However, for multi-stage centrifugal compressors with their complex internal structure, it is almost impossible or extremely complex to install all power transmission structures such as gears and linkages inside the compressor.

[0044] Compared with existing technologies, the adjustable blade drive device in this embodiment adopts a hydraulic drive method, using hydraulic oil to drive the blade rotation by adjusting the oil pressure. This simplifies the power transmission path from the drive device to the blade and simplifies the structure of the adjustable blade drive device. Because the adjustable blade drive device uses a hydraulic drive method, the hydraulic drive components can be embedded in the diffuser diaphragm, reducing the overall size of the diffuser. The adjustable blade drive device can also be used on inlet adjustable guide vanes.

[0045] The adjustable blade drive device of this embodiment is very suitable for multi-stage centrifugal compressors, especially for use in the interstage diffuser of a multi-stage compressor, that is, the diffuser located between two impellers. The compressor with the diffuser of this embodiment installed not only improves the performance of the compressor, but also has a simpler appearance.

[0046] In this embodiment, the structure of the adjustable blade drive device is illustrated using an adjustable blade drive device applied to a diffuser located at the compressor impeller outlet as an example. Those skilled in the art can apply the adjustable blade drive device of this embodiment to the compressor inlet guide vanes without any creative invention. The compressor inlet guide vanes, located at the compressor inlet, guide the airflow entering the impeller by adjusting the blade angle to change the direction and velocity components of the airflow entering the impeller. The core principle of both the compressor inlet guide vanes and the diffuser is that the adjustable blade drive device drives and adjusts the rotation angle of the guide vanes arranged in a ring array around the inlet and outlet.

[0047] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A diffuser, characterized in that, The system includes an adjustable blade assembly, which comprises an active blade assembly and multiple driven blade assemblies; both the active blade assembly and the driven blade assembly include blades. The diffuser is provided with a first oil chamber and a second oil chamber. The active blade assembly also includes a drive protrusion. The first oil chamber and the second oil chamber are located on both sides of the drive protrusion. When both oil chambers are filled with hydraulic oil and the oil pressure is the same, the active blade assembly is stationary. When the oil pressure in one oil chamber is greater than the oil pressure in the other oil chamber, the active blade assembly rotates. The rotation of the active blade assembly drives the rotation of the driven blade assembly, thereby causing all the blades of the adjustable blade assembly to rotate together.

2. The diffuser according to claim 1, characterized in that, It includes an inner cover plate and a partition plate. The partition plate has an inner cover plate mounting part at a position corresponding to the inner cover plate. After the inner cover plate and the inner cover plate mounting part are sealed together, they form a closed oil cavity. The driving protrusion is disposed in the oil cavity and divides the oil cavity into a first oil cavity and a second oil cavity that are independent of each other.

3. The diffuser according to claim 2, characterized in that, The oil cavity is also provided with a fixing protrusion. The bottom of the fixing protrusion is fixed in the groove of the oil cavity. After the inner cover plate is connected to the inner cover plate mounting part, the top surface of the fixing protrusion is sealed to the side of the inner cover plate near the oil cavity. The first oil cavity is formed between the left side of the fixing protrusion and the driving protrusion, and the second oil cavity is formed between the right side of the fixing protrusion and the driving protrusion.

4. The diffuser according to claim 3, characterized in that, The drive protrusion is fixedly connected to the inner cover plate on the side near the oil cavity.

5. The diffuser according to claim 4, characterized in that, The active blade assembly also includes a rotating shaft that passes through a through hole in the inner cover plate. The drive protrusion is fixed on the rotating shaft, which is rotatable relative to the inner cover plate.

6. The diffuser according to claim 5, characterized in that, The bottom of the oil cavity is provided with a shaft hole for supporting the central rotating shaft of the active blade assembly, and the rotating shaft is rotatably connected to the shaft hole.

7. The diffuser according to claim 3, characterized in that, The driving bump is a 1 / 2 ring-shaped bump, and the fixing bump is a 1 / 4 ring-shaped bump.

8. The diffuser according to claim 1, characterized in that, The partition has a first hydraulic flow channel for supplying hydraulic oil to the first oil chamber and a second hydraulic flow channel for supplying hydraulic oil to the second oil chamber. The first and second hydraulic flow channels are independent of each other. The partition is provided with a first oil injection hole for injecting oil into the first hydraulic flow channel and a second oil injection hole for injecting oil into the second hydraulic flow channel.

9. The diffuser according to claim 8, characterized in that, The oil inlet connecting the first hydraulic flow channel and the first oil chamber is a semi-circular hole, and the oil inlet connecting the second hydraulic flow channel and the second oil chamber is a semi-circular hole.

10. A compressor, characterized in that, Includes the diffuser according to any one of claims 1-9, wherein the diffuser is disposed at the outlet of the impeller.

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