Electric direct-drive mechanism for rotatable guide vane of axial flow compressor

Abstract

The invention aims to provide an adjustable guide vane electric direct drive mechanism of an axial flow compressor, which belongs to the field of axial flow compressors, and comprises an electric cylinder, a compressor and a pull and push dynamometer, a trunnion is arranged on the side of the electric cylinder, the trunnion is connected with an inclined lug seat, the inclined lug seat is fixed on a bracket, the bracket is fixed on a casing of the compressor, and the pull and push dynamometer is arranged on the bracket. One end of the pull and push dynamometer is connected with an extension rod of the electric cylinder through a double-thread screw, and the other end of the pull and push dynamometer is connected with the rotatable guide vane linkage ring through a connector. The telescopic rod of the electric cylinder is directly connected with the rotatable guide vane linkage ring through the Y-shaped connector, so that the middle switching link is reduced, the position precision of the rotatable guide vane during rotation is ensured, and the driving efficiency of the electric cylinder is improved; the S-shaped push-pull force meter is installed between the electric cylinder telescopic rod and the rotatable guide vane linkage ring, the maximum push-pull force needed by the gas compressor rotatable guide vane linkage ring can be displayed and tested in real time, the electric cylinder power level is reasonably selected, and unnecessary waste is avoided.

Description

Technical Field

[0001] The present invention relates to a turbomachinery mechanism, specifically an axial flow compressor mechanism. Background Technology

[0002] The use of rotatable guide vanes is a widely adopted anti-surge measure in gas turbine compressors. The function of rotatable guide vanes is to limit the airflow into the compressor by adjusting the angle of the guide vanes during unit startup, shutdown, or load adjustment, thereby protecting the unit's safe operation and improving operating efficiency.

[0003] The actual working state of the compressor's rotatable guide vanes and their drive mechanism is quite complex. When designing the rotatable guide vane drive mechanism, designers not only need to consider various kinematic pairs to ensure smooth, jam-free movement, but also need to rationally select the actuator type and power rating. Simultaneously, the structure must be simple, and installation and maintenance must be convenient. The actuator type is often limited by space constraints and the influence of daily operation and maintenance. Choosing a drive power rating that is too high will result in wasted equipment costs. Choosing a power rating that is too low will not meet functional requirements. Therefore, rationally designing the compressor's rotatable guide vane drive mechanism while ensuring the safe operation of the unit becomes a challenge. Summary of the Invention

[0004] The purpose of this invention is to provide an electric direct drive mechanism for rotatable guide vanes of an axial compressor that simplifies the rotatable guide vane actuator and improves the adjustment accuracy of the rotatable guide vanes.

[0005] The objective of this invention is achieved as follows:

[0006] The present invention discloses an electric direct-drive mechanism for a rotatable guide vane of an axial compressor, characterized in that it includes an electric cylinder, a compressor, and a push-pull force gauge. A trunnion is provided on the side of the electric cylinder, the trunnion is connected to a slanted lug seat, the slanted lug seat is fixed on a bracket, the bracket is fixed on the compressor casing, one end of the push-pull force gauge is connected to the extension rod of the electric cylinder through a double-ended screw, and the other end of the push-pull force gauge is connected to the rotatable guide vane linkage ring through a connector.

[0007] The present invention may also include:

[0008] 1. The push-pull force gauge is an S-type push-pull force gauge.

[0009] 2. The connector is a Y-type connector.

[0010] 3. The Y-type connector and the rotatable guide vane linkage ring are connected by a spherical joint bearing.

[0011] 4. The rotatable guide vane linkage ring can rotate freely and expand radially.

[0012] 5. The stroke of the electric cylinder is determined by the kinematic relationship between the rotation range of the compressor guide vanes and the electric cylinder.

[0013] 6. The power rating of the electric cylinder is determined by measuring the actual maximum push-pull force required by the electric cylinder using a push-pull force gauge.

[0014] The advantages of this invention are as follows: the electric cylinder telescopic rod is directly connected to the rotatable guide vane linkage ring via a Y-type connector, reducing intermediate transition links, ensuring the positional accuracy of the rotatable guide vane during rotation, and improving the driving efficiency of the electric cylinder; an S-type push-pull force gauge is installed between the electric cylinder telescopic rod and the rotatable guide vane linkage ring, which can display and test the maximum push-pull force required by the compressor's rotatable guide vane linkage ring in real time, allowing for the rational selection of the electric cylinder power level and avoiding unnecessary waste. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of the present invention;

[0016] Figure 2 View in direction G;

[0017] Figure 3 This is a FF sectional view;

[0018] Figure 4 This is one of the three-dimensional views of the present invention;

[0019] Figure 5 This is the second structural schematic diagram of the present invention;

[0020] Figure 6 This is the second three-dimensional view of the present invention. Detailed Implementation

[0021] The invention will now be described in more detail with reference to the accompanying drawings:

[0022] Combination Figure 1-6 This invention discloses an electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor, comprising: an electric cylinder trunnion 1, a bracket 2, an S-type push-pull force gauge 3, a double-ended screw 4, a spare nut 5, and a Y-type connector 6. The electric cylinder trunnion is mounted on the bracket 2 via the trunnion 1, and then fixed to the gas turbine compressor casing via the bracket 2 using hexagonal screws and self-locking washers. One end of the S-type push-pull force gauge 3 is connected to the electric cylinder extension rod via the double-ended screw 4 and the spare nut 5, and the other end is connected to the rotatable guide vane linkage ring spherical bearing via the spare nut 5 and the Y-type connector 6.

[0023] The electric cylinder trunnion is connected to the bracket 2 via a revolute joint, and the Y-joint 6 is connected to the rotatable guide vane linkage ring via a spherical joint bearing. This combination allows the linkage ring to rotate freely and expand radially, ensuring the mechanism does not jam during operation. The electric cylinder telescopic rod is directly connected to the rotatable guide vane linkage ring via the Y-joint 6, reducing intermediate connection points, ensuring the positional accuracy of the rotatable guide vane during rotation, and improving the electric cylinder's driving efficiency.

[0024] When selecting an electric cylinder, it is necessary to determine its stroke and maximum push-pull force. The stroke of the electric cylinder can be calculated by considering the rotation range of the compressor's rotatable guide vanes and the kinematic relationship between the electric cylinder and the compressor. However, the actual operating conditions and force states of the compressor's rotatable guide vanes and their drive mechanism are quite complex. Calculating the maximum push-pull force of the electric cylinder requires accurate calculations for each operating condition, which is challenging. Therefore, when selecting an electric cylinder, it is advisable to initially use a high-power electric cylinder and then use an S-type push-pull force gauge to test the actual maximum push-pull force required by the electric cylinder in real time. Based on this, a suitable power rating of the electric cylinder can be selected to ensure that equipment costs are not wasted.

[0025] The compressor rotatable guide vane actuator driven by an electric cylinder converts the rotary motion of the servo motor into linear motion, transforming the best advantage of the servo motor—precise speed, revolutions, and torque control—into precise speed, position, and push-pull force control. The electric cylinder drives the extension rod to perform linear reciprocating motion, generating force that causes the rotatable guide vane linkage ring to rotate along the circumferential direction of the compressor, thereby driving the compressor rotatable guide vane to rotate.

[0026] Once the maximum push-pull force of the electric cylinder is measured, the appropriate electric cylinder model can be selected. During formal installation, the S-type push-pull force gauge 3, double-ended screw 4, and spare nut 5 can be removed, and the Y-type connector 6 can be directly connected to the electric cylinder telescopic rod. The connector can be tightened by using spare nuts and locking screws. At the same time, shortening the bracket 2 or changing the form and length of the inclined lug 1 can meet the actual installation requirements.

Claims

1. An electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor, characterized in that: It includes an electric cylinder, a compressor, and a push-pull force gauge. The electric cylinder has a trunnion on its side, which is connected to a slanted lug seat. The slanted lug seat is fixed on a bracket, which is fixed on the compressor casing. One end of the push-pull force gauge is connected to the extension rod of the electric cylinder through a double-ended screw, and the other end of the push-pull force gauge is connected to a rotatable guide vane linkage ring through a connector.

2. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 1, characterized in that: The push-pull force gauge is an S-type push-pull force gauge.

3. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 1, characterized in that: The connector is a Y-type connector.

4. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 3, characterized in that: The Y-type connector and the rotatable guide vane linkage ring are connected by a spherical joint bearing.

5. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 4, characterized in that: The rotatable guide vane linkage ring can rotate freely and expand radially.

6. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 1, characterized in that: The stroke of the electric cylinder is solved by considering the rotation range of the compressor guide vanes and the kinematic relationship between the electric cylinder and the rotation range of the guide vanes.

7. The electrically driven direct-drive mechanism for rotatable guide vanes of an axial compressor according to claim 1, characterized in that: The power rating of the electric cylinder is determined by measuring the actual maximum push-pull force required by the electric cylinder using a push-pull force gauge.

Images