Guide vane actuator cylinder control structure with mechanical feedback

Abstract

The utility model relates to a guide vane actuating cylinder control structure with mechanical feedback, which comprises a transmission mechanism, a stepping motor, an oil distribution valve and a guide vane actuating cylinder, a cam is arranged on an output shaft of the stepping motor, the transmission mechanism comprises a connecting support, and a transmission lever is hinged to the upper end of the connecting support. A transmission guide rod is slidably arranged at the lower end of the connecting bracket; a cam rod matched with the cam is arranged at one end of the transmission lever, and the other end of the transmission lever is matched with one end of the transmission guide rod; a driving lever is arranged in the middle of the connecting bracket; one end of the transmission guide rod can be matched with one end of the driving lever; a feedback lever is arranged in the middle of the connecting support. According to the utility model, the structure of the stepping motor and mechanical feedback is utilized to ensure that the guide vane actuating cylinder can simultaneously use an open-loop control mode and a closed-loop control mode, internal force always exists in the structure, the transmission gap and the lifting and return hysteresis of the actuating cylinder are reduced, and the control precision of the guide vane actuating cylinder is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic machinery control and relates to a guide vane actuator cylinder control structure with mechanical feedback. Background Art

[0002] With the development of equipment, the performance requirements for aviation equipment are getting higher and higher. In order to improve the performance and increase the compressor surge margin, the installation angle of the compressor inlet guide vanes or the first few stages of static blades is controlled at different speeds to make the air flow channel area of ​​each stage meet the requirements of each state point, thereby controlling the air required by the compressor and improving performance.

[0003] The guide vane control system has gone through a development process from hydraulic mechanical to digital. Now the guide vane adjustment is one of the many functions included in the full authority digital control system (FADEC). The guide vane control system is also a typical digital electro-hydraulic servo system. Compared with the traditional hydraulic mechanical guide vane adjustment device, the digital guide vane adjustment device has the advantages of simple structure and high control accuracy.

[0004] The digital guide vane control system is mainly composed of sensors, electronic controllers, electro-hydraulic conversion components, actuators, oil sources, etc. At present, the electric-controlled guide vane adjustment device mostly uses electro-hydraulic servo valves as electro-hydraulic conversion components to convert control signals into hydraulic signals to achieve guide vane control. Electro-hydraulic servo valves have high requirements for the cleanliness of the oil used, and the hydraulic oil source usually uses flowing fuel, which increases the difficulty of pollution control. In addition, the use of electro-hydraulic servo valves for guide vane control requires the installation of guide vane position sensors to form a position closed-loop control, and electro-hydraulic servo valves cannot achieve guide vane control alone. Summary of the invention

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a guide vane actuator control structure with mechanical feedback.

[0006] In order to achieve the above purpose, the following technical solutions are adopted:

[0007] The guide vane actuator cylinder control structure with mechanical feedback comprises a transmission mechanism, a stepper motor, and an oil distribution valve, which are arranged on the guide vane actuator cylinder. A cam is arranged on the output shaft of the stepper motor. The transmission mechanism comprises a connecting bracket, a transmission lever is hinged on the upper end of the connecting bracket, and a transmission guide rod is slidably arranged on the lower end of the connecting bracket; a cam rod capable of cooperating with the cam is arranged at one end of the transmission lever, and the other end of the transmission lever cooperates with one end of the transmission guide rod;

[0008] A driving lever is arranged in the middle of the connecting bracket, the other end of the transmission guide rod can cooperate with one end of the driving lever, and a top block that can cooperate with the oil distribution valve is arranged in the middle of the driving lever; a feedback lever is arranged in the middle of the connecting bracket, one end of the feedback lever is hinged to the driving lever, and the other end is provided with a top rod that can cooperate with the piston rod of the guide vane actuator.

[0009] Preferably, the middle portion of the oil separation valve is connected to the high-pressure oil pipeline, and both ends of the oil separation valve are respectively connected to the low-pressure oil return pipeline.

[0010] Preferably, the two ends of the guide vane actuator are connected to the two ends of the oil distribution valve via oil guide pipelines.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The utility model utilizes a stepper motor plus a mechanical feedback structure to ensure that the guide vane actuator can use both open-loop and closed-loop control modes at the same time. Internal force always exists in the structure, which reduces the transmission gap and the actuator lift and return hysteresis loop, and improves the control accuracy of the guide vane actuator. The cam structure can be used to easily achieve various output requirements of the guide vane actuator, such as linear and nonlinear. At the same time, the cam profile can be adjusted through kinematic back-calculation for deviations generated during the actual assembly process, thereby improving the adaptability of the solution. Compared with a servo valve, the stepper motor has simpler control, is insensitive to oil cleanliness, and has improved pollution resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a main schematic diagram of the utility model.

[0015] Figure 3 It is a schematic diagram of the oil circuit of the utility model.

[0016] In the figure: 1. stepper motor; 2. oil distribution valve; 3. guide vane actuator; 4. cam; 5. connecting bracket; 6. transmission lever; 7. transmission guide rod; 8. cam rod; 9. driving lever; 10. push block; 11. feedback lever; 12. push rod; 13. high-pressure oil pipeline; 14. low-pressure oil return pipeline; 15. oil guide pipeline. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0018] like Figure 1-Figure 3 As shown, a guide vane actuator control structure with mechanical feedback includes a transmission mechanism, a stepper motor 1, an oil distribution valve 2, which is arranged on the guide vane actuator 3, a cam 4 is arranged on the output shaft of the stepper motor 1, and the stepper motor 1 is fixedly installed on the equipment frame;

[0019] The transmission mechanism includes a connecting bracket 5, which provides a support and installation space for various components of the transmission mechanism; a transmission lever 6 is hinged at the upper end of the connecting bracket 5, and a transmission guide rod 7 is slidably provided at the lower end of the connecting bracket 5;

[0020] One end of the transmission lever 6 is provided with a cam rod 8 which can cooperate with the cam 4. When the cam 4 rotates, the cam rod 8 is pushed upward, driving the transmission lever 6 to swing;

[0021] The other end of the transmission lever 6 cooperates with one end of the transmission guide rod 7. When the transmission lever 6 swings, it drives the transmission guide rod 7 to move horizontally.

[0022] A driving lever 9 is provided in the middle of the connecting bracket 5, and the other end of the transmission guide rod 7 can be matched with one end of the driving lever 9;

[0023] A top block 10 that can cooperate with the oil-distributing valve 2 is arranged in the middle of the driving lever 9. When the transmission guide rod 7 moves laterally, it drives the driving lever 9 to swing. When the driving lever 9 swings, the top block 10 pushes the oil-distributing valve 2 to move.

[0024] A feedback lever 11 is provided in the middle of the connecting bracket 5, one end of the feedback lever 11 is hinged to the driving lever 9, and the other end is provided with a push rod 12 that can cooperate with the piston rod of the guide vane actuator 3. When the driving lever 9 swings, the feedback lever 11 rotates accordingly to form mechanical feedback, which acts on the main shaft of the oil-dividing valve 2. The oil-dividing valve 2 is displaced in the reverse direction to gradually close the control hole of the oil-dividing valve 2 and return to the neutral state, and the guide vane actuator 3 stops moving.

[0025] Furthermore, the middle portion of the oil separation valve 2 is connected to the high-pressure oil pipeline 13 , and both ends of the oil separation valve 2 are connected to the low-pressure oil return pipeline 14 , respectively.

[0026] Furthermore, the two ends of the guide vane actuator 3 are connected to the two ends of the oil distribution valve 2 via oil guide pipes 15 .

[0027] Working principle: When the whole system is in a stable state, the oil-distributing valve 2 is in an intermediate state, the oil-distributing valve 2 is pressed against the driving lever 9 by the spring force, the driving lever 9 is pressed against the transmission guide rod 7, the transmission guide rod 7 is pressed against the transmission lever 6, one end of the transmission lever 6 has a tendency to rotate due to the thrust of the transmission guide rod 7, and the other end of the transmission lever 6 is in rigid contact with the cam 4;

[0028] When the guide vane actuator 3 needs to move, the stepper motor 1 drives the cam 4 to rotate, the cam 4 cooperates with the cam rod 8 to push the transmission lever 6 to move, the transmission lever 6 drives the transmission guide rod 7 to move horizontally, the transmission guide rod 7 drives the driving guide rod 9 to swing, the top block 10 on the driving guide rod 9 drives the oil distribution valve 2 to move, the oil distribution valve 2 makes the lower chamber of the guide vane actuator 3 communicate with high-pressure oil, and the upper chamber communicates with low-pressure oil, the upper and lower pressure difference of the guide vane actuator 3 causes the guide vane actuator 3 to extend outward, and at the same time, the piston rod of the guide vane actuator 3 cooperates with the feedback lever 11 The oil-dividing valve 2 is combined to form a mechanical negative feedback, with the feedback lever 11 and the transmission guide rod 7 acting on the main shaft of the oil-dividing valve 2 through the driving lever 9, so that the oil-dividing valve 2 is displaced in the opposite direction, and the control hole of the oil-dividing valve 2 is gradually closed. The oil-dividing valve 2 switches the pressure at both ends of the actuator cylinder. When the guide vane actuator cylinder 3 is displaced to the target position, the oil-dividing valve 2 returns to the neutral state due to the mechanical negative feedback, the high and low pressure oil circuits are cut off, the guide vane actuator cylinder 3 stops moving, and the whole mechanism reaches a new balance point, realizing the mechanical closed-loop control of the displacement of the guide vane actuator cylinder 3.

[0029] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A guide vane actuator control structure with mechanical feedback, comprising a transmission mechanism, a stepping motor (1), an oil distribution valve (2), and arranged on the guide vane actuator (3), wherein: A cam (4) is arranged on the output shaft of the stepping motor (1); the transmission mechanism comprises a connecting bracket (5); a transmission lever (6) is hingedly connected to the upper end of the connecting bracket (5); a transmission guide rod (7) is slidably arranged on the lower end of the connecting bracket (5); a cam rod (8) capable of cooperating with the cam (4) is arranged at one end of the transmission lever (6); and the other end of the transmission lever (6) is cooperating with one end of the transmission guide rod (7); A driving lever (9) is arranged in the middle of the connecting bracket (5), and the other end of the transmission guide rod (7) can cooperate with one end of the driving lever (9); a top block (10) that can cooperate with the oil distribution valve (2) is arranged in the middle of the driving lever (9); a feedback lever (11) is arranged in the middle of the connecting bracket (5), one end of the feedback lever (11) is hinged to the driving lever (9), and the other end is arranged with a top rod (12) that can cooperate with the piston rod of the guide vane actuator (3).

2. A guide vane actuator control structure with mechanical feedback according to claim 1, characterized in that: The middle portion of the oil separation valve (2) is connected to the high-pressure oil pipeline (13), and both ends of the oil separation valve (2) are respectively connected to the low-pressure oil return pipeline (14).

3. The guide vane actuator control structure with mechanical feedback according to claim 2 is characterized in that: The two ends of the guide vane actuator (3) are respectively connected to the two ends of the oil distribution valve (2) by means of oil guide pipelines (15).

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