An inlet flow vane adjusting mechanism of a centrifugal compressor

Abstract

The utility model relates to an inlet flow guide vane adjusting mechanism of centrifugal compressor, including the guide vane mounting seat that a plurality of guide vanes are rotatably connected, the rotatable drive ring of guide vane mounting seat outside is equipped with, and the drive ring is connected through linkage assembly between every guide vane, drive assembly is equipped with outside the guide vane mounting seat, drive assembly includes positive rotation towrope, reverse rotation towrope and pivot, positive rotation towrope one end is wound on pivot, the other end is fixed on drive ring after passing drive ring in reverse, reverse rotation towrope one end is wound on pivot, the other end is fixed on drive ring after passing drive ring in positive, and the winding direction of positive, reverse rotation towrope on pivot is opposite. The utility model discloses the drive mode of inlet flow guide vane adjusting mechanism of centrifugal compressor is simple, and the compact structure can reduce the cost while improving control accuracy, and the few parts can be reliable, and the failure rate is low, guarantees the stable and reliable operation of guide vane.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal compressor technology, and in particular to an inlet flow guide vane adjustment mechanism for a centrifugal compressor. Background Technology

[0002] Centrifugal compressors are continuous rotary machines with advantages such as large flow rate, uniform exhaust, stable operation, and compact structure. Therefore, they are widely used in industrial fields. The disadvantage is that centrifugal compressors are affected by surge, which limits the applicable operating conditions of centrifugal compressors. Therefore, centrifugal compressors are designed with an intake airflow adjustment device to improve their application range.

[0003] Currently, the basic scheme of guide vane adjustment mechanism is to use a power source, such as a motor, to drive a component to rotate. This component then drives the opening and closing motion of the guide vanes through a transmission mechanism. Generally, the number of transmission mechanisms equals the number of guide vanes. For example, CN212774925U and CN113700675B use a transmission method of a large bevel gear with multiple small bevel gears to transmit the rotational motion of the motor to the opening and closing motion of the guide vanes. However, gear transmission requires very high machining precision of the components, resulting in high cost. Another example is CN105020162B and CN106194843A, which connect the guide vanes to a drive ring through a linkage mechanism. The power transmission process is: motor to one linkage mechanism, then to the drive ring, then the drive ring simultaneously drives other linkage mechanisms, and finally simultaneously drives other guide vanes. This method results in low guide vane adjustment precision, a tendency for the mechanism to jam, and low reliability. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an inlet flow guide vane adjustment mechanism for a centrifugal compressor, which has a simple transmission method, compact structure, high reliability, low failure rate, and ensures stable and reliable operation of the guide vane.

[0005] This utility model is implemented using the following scheme: an inlet flow guide vane adjustment mechanism for a centrifugal compressor, including a guide vane mounting base rotatably connected to several guide vanes, a rotatable drive ring sleeved on the outside of the guide vane mounting base, the drive ring and each guide vane being connected by a linkage component, a drive component provided on the outer side of the guide vane mounting base, the drive component including a forward rotation traction cable, a reverse rotation traction cable and a rotating shaft, one end of the forward rotation traction cable being wound around the rotating shaft and the other end being fixed to the drive ring after passing around the drive ring in the reverse direction, one end of the reverse rotation traction cable being wound around the rotating shaft and the other end being fixed to the drive ring after passing around the drive ring in the forward direction, the winding directions of the forward and reverse rotation traction cables on the rotating shaft being opposite.

[0006] Furthermore, the drive assembly also includes a motor, a forward-rotating fixed pulley, and a reverse-rotating fixed pulley. The rotating shaft is coaxially connected to the main shaft of the motor. The forward-rotating traction cable passes around the forward-rotating fixed pulley, and the reverse-rotating traction cable passes around the reverse-rotating fixed pulley.

[0007] Furthermore, it also includes an intake housing, with the guide vane mounting base connected to the middle of the intake housing, and the two ends of the rotating shaft rotatably mounted inside the intake housing via bearings.

[0008] Furthermore, the linkage assembly includes a spherical plain bearing and a connecting rod, and the guide vane includes a blade portion and a guide vane shaft. The guide vane shaft is rotatably connected to the guide vane mounting base via the guide vane bearing. The guide vane shaft is hinged to one end of the connecting rod, and the other end of the connecting rod is connected to the drive ring via the spherical plain bearing.

[0009] Furthermore, it also includes an opening degree indicator assembly, which includes a pointer rod, a pointer, and a sight glass; one end of the pointer rod is coaxially connected to the end of the guide vane shaft of one of the guide vanes, the pointer is fixed to the other end of the pointer rod by a screw, and the sight glass is set on the side of the intake housing corresponding to the pointer position.

[0010] Furthermore, the drive ring is rotatably mounted on the outside of the guide vane mounting seat via a drive ring bearing.

[0011] Furthermore, the outer periphery of the drive ring is provided with two circumferential grooves, and the forward and reverse traction passes around the drive ring along the two circumferential grooves respectively.

[0012] Compared with the prior art, the present invention has the following advantages: the inlet flow guide vane adjustment mechanism of the centrifugal compressor of the present invention has a simple transmission method and compact structure, which can reduce costs while improving control accuracy. It has fewer parts, high reliability, low failure rate, and ensures stable and reliable operation of the guide vane.

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0014] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0015] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0016] Figure 3 This is a perspective view of an embodiment of the present invention omitting the air intake housing;

[0017] Figure 4 This is a schematic diagram of the linkage component structure according to an embodiment of the present utility model;

[0018] Figure 5 This is a schematic diagram of the drive component structure according to an embodiment of the present invention;

[0019] Explanation of the component designations: 1-Inlet housing, 2-Motor, 3-Forward rotating fixed pulley, 4-Rotating shaft, 5-Reverse rotating fixed pulley, 6-Sight glass, 7-Drive ring, 8-Guide vane mounting seat, 9-Drive ring bearing, 10-Guide vane, 11-Forward rotating traction cable, 12-Bearing, 13-Reverse rotating traction cable, 14-Pointer, 15-Pointer rod, 16-Spherical joint bearing, 17-Connecting rod, 18-Guide vane bearing. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] like Figures 1-5As shown, an inlet flow guide vane adjustment mechanism for a centrifugal compressor includes a guide vane mounting base 8 rotatably connected to a plurality of guide vanes 10. A rotatable drive ring 7 is sleeved on the outside of the guide vane mounting base 8. The drive ring 7 and each guide vane 10 are connected by a linkage assembly. A drive assembly is provided on the outer side of the guide vane mounting base 8. The drive assembly includes a forward rotation traction cable 11, a reverse rotation traction cable 13, and a rotating shaft 4. One end of the forward rotation traction cable 11 is wound around the rotating shaft 4, and the other end passes around the drive ring 7 in the reverse direction and is fixed to the drive ring 7. One end of the reverse rotation traction cable 13 is wound around the rotating shaft 4, and the other end passes around the drive ring 7 in the forward direction and is fixed to the drive ring 7. The forward and reverse rotation traction cables are wound in opposite directions on the rotating shaft. The forward and reverse rotation traction cables are wound around the two ends of the rotating shaft 4, respectively. The axis of the rotating shaft is perpendicular to the center line of the guide vane mounting base. The drive assembly transmits the rotational motion of the shaft to the drive ring. The forward and reverse rotation of the shaft causes the drive ring to rotate clockwise or counterclockwise. When the shaft rotates forward, the forward traction cable 11 pulls the drive ring forward, and the reverse traction cable releases simultaneously. When the shaft rotates in reverse, the reverse traction cable 13 pulls the drive ring in the opposite direction, and the forward traction cable releases simultaneously. This invention's centrifugal compressor inlet flow guide vane adjustment mechanism features a simple transmission method, compact structure, reduced costs while improving control accuracy, fewer parts, high reliability, low failure rate, and ensures stable and reliable guide vane operation.

[0023] In this embodiment, the drive assembly further includes a motor 2, a forward-rotating fixed pulley 3, and a reverse-rotating fixed pulley 5. The rotating shaft 4 is coaxially connected to the main shaft of the motor 2. The forward-rotating traction cable 11 passes over the forward-rotating fixed pulley 3, and the reverse-rotating traction cable 13 passes over the reverse-rotating fixed pulley 5. The forward-rotating fixed pulley 3 and the reverse-rotating fixed pulley 5 are mounted on the air intake housing 1 by screws. The forward-rotating fixed pulley 3 and the reverse-rotating fixed pulley 5 are located near both ends of the rotating shaft. The forward-rotating traction cable 11 passes over the forward-rotating fixed pulley 3 and the drive ring 7 in sequence, and the reverse-rotating traction cable passes over the reverse-rotating fixed pulley 5 and the drive ring 7 in sequence.

[0024] In this embodiment, an intake housing 1 is also included. The guide vane mounting seat 8 is bolted to the middle of the intake housing. The two ends of the rotating shaft 4 are rotatably mounted inside the intake housing via bearings 12.

[0025] In this embodiment, the linkage assembly includes a spherical plain bearing 16 and a connecting rod 17. The guide vane 7 includes a blade portion and a guide vane shaft. The guide vane shaft of the guide vane 7 is rotatably connected to the guide vane mounting base 8 via a guide vane bearing 18. One end of the guide vane shaft and the connecting rod 17 are hinged together by a pin, and the other end of the connecting rod 17 is connected to the drive ring via the spherical plain bearing 16. The connecting rod 17 can rotate around the pin. One end of the spherical plain bearing is threaded onto the drive ring 7, and the other end is fitted into the connecting rod 17. The linkage assembly is responsible for transmitting the movement of the drive ring to each guide vane, realizing the opening and closing action of the guide vane.

[0026] In this embodiment, an opening degree indicator assembly is also included, comprising a pointer rod 18, a pointer 14, and a sight glass 6. One end of the pointer rod 18 is coaxially connected to the end of the guide vane shaft of one of the guide vanes, the pointer 14 is fixed to the other end of the pointer rod by a screw, and the sight glass 6 is disposed on the side of the intake housing corresponding to the pointer position. The opening degree indicator assembly allows operators to easily observe the opening and closing status of the guide vanes.

[0027] In this embodiment, the drive ring 7 is rotatably mounted on the outside of the guide vane mounting seat via the drive ring bearing 9. The opening and closing action of the guide vane 10 can drive the pointer to rotate, so that the operator can judge whether the entire mechanism is operating accurately and stably through the sight glass 6 mounted on the intake housing 1.

[0028] In this embodiment, the outer periphery of the drive ring is provided with two circumferential grooves, and the forward and reverse traction passes around the drive ring along the two circumferential grooves respectively.

[0029] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0030] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0031] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0032] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. An inlet flow guide vane adjustment mechanism for a centrifugal compressor, comprising a guide vane mounting base rotatably connected to a plurality of guide vanes, wherein a rotatable drive ring is sleeved on the outside of the guide vane mounting base, and the drive ring and each guide vane are connected by a linkage assembly, characterized in that: A drive assembly is provided on the outer side of the guide vane mounting base. The drive assembly includes a forward traction cable, a reverse traction cable, and a rotating shaft. One end of the forward traction cable is wound around the rotating shaft, and the other end passes around the drive ring in the reverse direction and is fixed to the drive ring. One end of the reverse traction cable is wound around the rotating shaft, and the other end passes around the drive ring in the forward direction and is fixed to the drive ring. The forward and reverse traction cables are wound in opposite directions on the rotating shaft.

2. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 1, characterized in that: The drive assembly also includes a motor, a forward-rotating fixed pulley, and a reverse-rotating fixed pulley. The rotating shaft is coaxially connected to the main shaft of the motor. The forward-rotating traction cable passes around the forward-rotating fixed pulley, and the reverse-rotating traction cable passes around the reverse-rotating fixed pulley.

3. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 1, characterized in that: It also includes an intake housing, the guide vane mounting base is connected to the middle of the intake housing, and the two ends of the rotating shaft are rotatably mounted inside the intake housing via bearings.

4. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 1, characterized in that: The linkage assembly includes a spherical plain bearing and a connecting rod. The guide vane includes a blade section and a guide vane shaft. The guide vane shaft is rotatably connected to the guide vane mounting base via the guide vane bearing. The guide vane shaft is hinged to one end of the connecting rod, and the other end of the connecting rod is connected to the drive ring via a spherical plain bearing.

5. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 3, characterized in that: It also includes an opening indicator assembly, which includes a pointer rod, a pointer, and a sight glass; one end of the pointer rod is coaxially connected to the end of the guide vane shaft of one of the guide vanes, the pointer is fixed to the other end of the pointer rod by a screw, and the sight glass is set on the side of the intake housing corresponding to the pointer position.

6. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 1, characterized in that: The drive ring is rotatably mounted on the outside of the guide vane mounting base via a drive ring bearing.

7. The inlet flow guide vane adjustment mechanism of the centrifugal compressor according to claim 1, characterized in that: The outer periphery of the drive ring is provided with two circumferential grooves, and the forward and reverse traction passes around the drive ring along the two circumferential grooves respectively.

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