A method for measuring and adjusting the resistance of a compressor regulating mechanism

Abstract

The present invention belongs to the technical field of aircraft engine operation, and specifically relates to a method for measuring and adjusting the resistance of a compressor regulating mechanism. The technical solution of the present invention is as follows: A method for measuring and adjusting the resistance of a compressor regulating mechanism, comprising the following steps: 1) measuring the resistance on the transmission arm of the compressor regulating mechanism; 2) when the resistance measurement result exceeds the standard value, adjusting the regulating mechanism; 3) repeating the above steps 1) and 2), when the resistance measurement result is equal to or lower than the standard value, the work is completed. The method for measuring and adjusting the resistance of a compressor regulating mechanism provided by the present invention can measure and adjust the resistance of the regulating mechanism to reduce the resistance of the regulating mechanism and ensure the normal operation of the engine.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine operation, and in particular relates to a method for measuring and adjusting the resistance of a compressor regulating mechanism. Background Art

[0002] When the working state of the aircraft engine changes, the compressor components need to change the installation angle of the stator blades through the adjustment mechanism so that the airflow attack angle of each stage of the compressor is close to the design angle. The adjustment mechanism consists of a hydraulic actuator, a transmission arm, a connecting rod 1, a crank, a connecting rod 2, an actuating ring, a rocker arm and a stator blade connected in sequence; the hydraulic actuator is fixed on the outer wall of the compressor casing, and the connecting rod 1, the crank, the connecting rod 2, the actuating ring, the rocker arm and the stator blade are arranged inside the compressor casing, and the transmission arm is responsible for the internal and external communication of the compressor casing; the piston rod of the hydraulic actuator drives the crank to rotate through the transmission arm and the connecting rod 1, the crank drives the actuating ring to rotate through the connecting rod 2, and the actuating ring drives the stator blade to rotate through the rocker arm. The adjustment mechanism involves about 400 to 600 moving components and a large number of friction pairs. When the resistance in an individual friction pair is too large, it will affect the change law of the entire adjustment mechanism, and then affect the reliability of the engine. To this end, it is necessary to find a method for measuring and adjusting the resistance of the compressor adjustment mechanism. Summary of the invention

[0003] The invention provides a method for measuring and adjusting the resistance of a compressor regulating mechanism, which can measure and adjust the resistance of the regulating mechanism to reduce the resistance of the regulating mechanism and ensure the normal operation of the engine.

[0004] The compressor regulating mechanism is composed of a hydraulic actuator, a transmission arm, a connecting rod 1, a crank, a connecting rod 2, an actuator ring, a rocker arm and a stator blade connected in sequence, wherein the transmission arm includes a rotating shaft, a support arm 1 and a support arm 2, and the support arm 1 and the support arm 2 are respectively fixedly arranged at the two ends of the rotating shaft, and the rotating shaft is rotatably connected to the compressor casing. The support arm 1 is located outside the compressor casing and connected to the piston rod of the hydraulic actuator, and the support arm 2 is located inside the compressor casing and connected to the connecting rod 1.

[0005] The outer end journal of the stator blade is installed in the blade hole of the compressor casing, and the inner end journal of the stator blade is installed on the inner ring of the compressor. The rocker arm is fixed to the outer end journal of the stator blade by the outer end bolt, and the stator blade is also fixed to the blade hole of the casing. The inner ring of the compressor is a half-structure of the front half ring + the rear half ring. After the outer end journal of the stator blade is fixed to the compressor casing, the inner end journal of the stator blade is installed in the blade hole of the inner ring, and the front and rear half rings of the inner ring are fixed by the inner end nut + inner end bolt to prevent them from shifting. The tightening degree of the outer end bolt directly affects the radial activity of the stator blade, and the tightening degree of the inner end nut affects the force of the inner ring clamping the inner end journal of the stator blade.

[0006] The number of stator blades in each compressor stage is 60-80. The stator blades are evenly distributed along the circumference and installed in the compressor casing and inner ring. The number of corresponding outer end bolts and inner end nuts is the same as the number of stator blades. The stator blades, outer end bolts and inner end nuts of the same compressor stage form a complete circle.

[0007] In order to determine the resistance measurement position of the regulating mechanism, the force transmission routes of the various components of the regulating mechanism were analyzed. It was believed that resistance measurement on the transmission arm could accurately reflect the resistance of the entire regulating mechanism.

[0008] When the resistance measurement results are outside the standard values ​​(established through statistical analysis), the regulating mechanism needs to be adjusted.

[0009] The regulating mechanism resistance R can be calculated by the following formula:

[0010]

[0011] in: is the number of friction pairs of the ith type, is the friction coefficient of the ith friction pair, is the positive pressure of the i-th friction pair.

[0012] A statistical analysis of the number of friction pairs in the adjustment mechanism revealed that the number of friction pairs at the inner and outer ends of the stator blades The largest number (more than 70% of the total) has the most significant impact on the resistance R of the adjustment mechanism. In general, each friction pair has been lubricated and its friction coefficient The adjustable range is not large. Therefore, the outer end bolt and inner end nut of the blade are selected as the adjustment objects, and the positive pressure at this point is Size and distribution uniformity are used as tuning parameters.

[0013] The technical solution of the present invention is as follows:

[0014] A method for measuring and adjusting the resistance of a compressor regulating mechanism comprises the following steps:

[0015] 1) Carry out resistance measurement on the transmission arm of the compressor regulating mechanism;

[0016] 2) When the resistance measurement result exceeds the standard value, adjust the adjustment mechanism; the specific adjustment steps are:

[0017] a. Loosen all outer end bolts;

[0018] b. Loosen all inner nuts;

[0019] c. Tighten the outer end bolts in a cross-shaped order to control the full circle tightening torque and variance of the same stage compressor;

[0020] d. Tighten the inner nuts in a cross-shaped order to control the full-circle tightening torque and variance of the same-stage compressor;

[0021] 3) Repeat the above steps 1) and 2) when the resistance measurement result is equal to or lower than the standard value, the work is completed.

[0022] Furthermore, in the method for measuring and adjusting the resistance of the compressor regulating mechanism, in the step 1), there are two ways to measure the resistance on the transmission arm. One is: using a torque wrench to rotate the transmission arm at the connection between the rotating shaft and the support arm, reading the torque from the torque wrench, and measuring the resistance; the other is: using a spring scale to pull the transmission arm at the connection between the support arm and the piston rod of the hydraulic actuator, reading the pulling force value from the spring scale, and measuring the resistance.

[0023] The beneficial effects of the present invention are as follows: the method of the present invention can measure and adjust the resistance of the regulating mechanism to reduce the resistance of the regulating mechanism and ensure the normal operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the working state of the compressor regulating mechanism;

[0025] Figure 2 It is a partial structural diagram of the regulating mechanism;

[0026] Figure 3 It is the structural diagram of the transmission arm;

[0027] Figure 4 This is a schematic diagram of the installation status of the stator blades. DETAILED DESCRIPTION

[0028] like Figure 1-4 As shown, the compressor regulating mechanism is composed of a hydraulic actuator 1, a transmission arm 2, a connecting rod 1 3, a crank 4, a connecting rod 2 5, an actuator ring 6, a rocker arm 7 and a stator blade 8 which are connected in sequence, wherein the transmission arm 2 includes a rotating shaft 14, a support arm 1 15 and a support arm 2 16, the support arm 1 15 and the support arm 2 16 are respectively fixedly arranged at both ends of the rotating shaft 14, the rotating shaft 14 is rotatably connected to the compressor casing, the support arm 1 15 is located outside the compressor casing and connected to the piston rod of the hydraulic actuator 1, and the support arm 2 16 is located inside the compressor casing and connected to the connecting rod 1 3.

[0029] The outer end journal of the stator blade 8 is installed in the blade hole of the compressor casing, and the inner end journal of the stator blade 8 is installed on the inner ring 13 of the compressor. The rocker arm 7 is fixed to the outer end journal of the stator blade 8 by the outer end bolt 11, and the stator blade 8 is also fixed to the blade hole of the casing. The inner ring 13 of the compressor is a half-structure of the front half ring + the rear half ring. After the outer end journal of the stator blade 8 is fixed to the compressor casing, the inner end journal of the stator blade 8 is installed in the blade hole of the inner ring 13, and the front and rear half rings of the inner ring 13 are fixed by the inner end nut 12 + inner end bolt to prevent them from being offset. The tightening degree of the outer end bolt 11 directly affects the radial activity of the stator blade 8, and the tightening degree of the inner end nut 12 affects the force of the inner ring 13 clamping the inner end journal of the stator blade 8.

[0030] The number of stator blades 8 of each compressor stage is 60-80, and the stator blades 8 are installed in the compressor casing and the inner ring 13 in a uniformly distributed manner along the circumference, and the number of corresponding outer end bolts 11 and inner end nuts 12 is the same as the number of stator blades 8. The stator blades 8, outer end bolts 11, and inner end nuts 12 of the same compressor stage form a complete circle.

[0031] Example 1

[0032] A method for measuring and adjusting the resistance of a compressor regulating mechanism comprises the following steps:

[0033] 1) Measure the resistance on the transmission arm 2 of the compressor regulating mechanism; use a torque wrench to rotate the transmission arm 2 at the connection point between the rotating shaft 14 and the support arm 15, read the torque from the torque wrench, and measure the resistance;

[0034] 2) When the resistance measurement result exceeds the standard value, adjust the adjustment mechanism; the specific adjustment steps are:

[0035] a. Loosen all outer end bolts 11;

[0036] b. Loosen all inner nuts 12;

[0037] c. Tighten the outer end bolts 11 in a cross-shaped order to control the full circle tightening torque and variance of the same stage compressor;

[0038] d. Tighten the inner nut 12 in a cross-shaped order to control the full-circle tightening torque and variance of the same-stage compressor;

[0039] 3) Repeat the above steps 1) and 2) when the resistance measurement result is equal to or lower than the standard value, the work is completed.

[0040] Example 2

[0041] The difference from the first embodiment is that a spring scale is used at the connection point 10 between the support arm 15 and the piston rod of the hydraulic actuator 1 to pull the transmission arm, and the pulling force value is read from the spring scale to measure the resistance value.

Claims

1. A method for measuring and adjusting the resistance of a compressor regulating mechanism, characterized in that: The compressor regulating mechanism is composed of a hydraulic actuator, a transmission arm, a connecting rod 1, a crank, a connecting rod 2, an actuating ring, a rocker arm and a stator blade connected in sequence, wherein the transmission arm comprises a rotating shaft, a support arm 1 and a support arm 2, the support arm 1 and the support arm 2 are respectively fixedly arranged at the two ends of the rotating shaft, the rotating shaft is rotatably connected to the compressor casing, the support arm 1 is located outside the compressor casing and connected to the piston rod of the hydraulic actuator, and the support arm 2 is located inside the compressor casing and connected to the connecting rod 1; the rocker arm is fixed to the outer end journal of the stator blade by an outer end bolt, and the stator blade is also fixed to the blade hole of the casing; the inner ring of the compressor is a half-structure of a front half ring + a rear half ring, after the outer end journal of the stator blade is fixed to the compressor casing, the inner end journal of the stator blade is installed in the blade hole of the inner ring, and the front and rear half rings of the inner ring are fixed by an inner end nut + an inner end bolt to prevent them from being offset; The steps include: 1) Carry out resistance measurement on the transmission arm of the compressor regulating mechanism; 2) When the resistance measurement result exceeds the standard value, adjust the adjustment mechanism; the specific adjustment steps are: a. Loosen all outer end bolts; b. Loosen all inner nuts; c. Tighten the outer end bolts in a cross-shaped order to control the full circle tightening torque and variance of the same stage compressor; d. Tighten the inner nuts in a cross-shaped order to control the full-circle tightening torque and variance of the same-stage compressor; 3) Repeat the above steps 1) and 2) when the resistance measurement result is equal to or lower than the standard value, the work is completed.

2. The method for measuring and adjusting the resistance of a compressor regulating mechanism according to claim 1, characterized in that: In the step 1), there are two ways to measure the resistance on the transmission arm. One is: using a torque wrench to rotate the transmission arm at the connection between the rotating shaft and the support arm, reading the torque from the torque wrench, and measuring the resistance; the other is: using a spring scale to pull the transmission arm at the connection between the support arm and the piston rod of the hydraulic actuator, reading the pulling force value from the spring scale, and measuring the resistance.

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