A device for measuring the axial force of a turbine disc cavity

Abstract

The present invention belongs to the technical field of gas turbines, and relates to a device for measuring the axial force of a turbine disc cavity, including a rotating assembly, a rotating and stator disc test piece, an air supply system and a data measurement system. A motor drives a torque meter to work, outputs torque to a gearbox, adjusts the speed through the gearbox, drives the main shaft to rotate at the designed speed through a coupling, and drives the turntable to rotate. The comb structure on the turntable and the honeycomb structure on the shell cooperate to form a honeycomb-comb seal structure; the air storage box delivers compressed air to the internal chamber of the turntable through an air inlet pipe, and the compressed air flows through the sealing structure to generate a pressure difference between the front and rear chambers of the turntable, and then is discharged from the outlet pipeline; the pressure of the front and rear chambers is measured by a pressure transmitter arranged on the wall of the shell, and the experimental data is recorded by a data acquisition device. The present invention converts the direct measurement of the axial force into the pressure of the two chambers before and after the turntable, and obtains the axial force through calculation, thereby achieving the purpose of measuring the axial force.

Description

Technical Field

[0001] The invention belongs to the technical field of gas turbine air systems, and in particular relates to a device for measuring the axial force of a turbine disc cavity. Background Art

[0002] In modern gas turbine air systems, balancing axial force has become a key issue. If the axial force is too large, the bearing will work in an overloaded state for a long time, which will directly cause the bearing to heat up and reduce its service life. If the axial force is too small, the rotor will work in a light-load slipping state, which can easily damage the bearing. During the installation and commissioning of the gas turbine, adjusting the axial force is a costly task, and accurately measuring the axial force is a key issue that needs to be solved urgently. Therefore, the present invention designs a device for measuring the axial force of the turbine disc cavity to solve the above problem. Summary of the invention

[0003] The present invention proposes a device for measuring the axial force of a turbine disc cavity, so as to solve the problem mentioned in the above background that the real disc cavity has a complex structure and the axial force cannot be directly measured.

[0004] To achieve the above object, the present invention adopts the following technical scheme:

[0005] A device for measuring the axial force of a turbine disc cavity, comprising a rotating assembly, an air supply system, a rotating and static disc test piece, and a data measurement system;

[0006] The rotating assembly includes a base, a motor, a torque meter, a gear box, a coupling, a bearing box and a main shaft. The motor power is adjusted to cooperate with the torque meter to output torque to the gear box, and the speed is adjusted by the gear box. The main shaft is driven to rotate at a designed speed through the coupling. The bearing box plays the role of fixing the main shaft and lubricating / cooling the bearings.

[0007] The air supply system includes an air storage box, an air intake pipeline, an inlet manifold and an outlet manifold. The box is filled with air of a certain pressure, and the compressed air enters the rotor-stator test piece through the intake pipeline, the inlet manifold and the shell inlet in turn, and the switch of the pipeline is controlled by the solenoid valve on the intake pipeline, and the flow rate, temperature and pressure are monitored by the flow meter, temperature sensor and pressure sensor, and then discharged through the outlet manifold, and the required back pressure is provided by the pressure relief valve at the tail of the outlet manifold;

[0008] The rotating and stationary disc test piece includes a rotating disc, a shell, a comb-tooth part and a honeycomb part. The rotating disc is connected to the main shaft through a tendon sheath and is driven by the main shaft to rotate at a required speed. The comb-tooth part is fixed to the rotating disc through bolts and forms a rotating sealing structure with the honeycomb part fixed to the shell. Compressed air flows through the rotating sealing structure to form a pressure difference in the front and rear chambers, which acts on the rotating disc as an axial force.

[0009] The data measurement system includes a pressure transmitter 22 and a data acquisition device. The pressure transmitters 22 are arranged on both sides of the shell in the circumferential direction and radial direction respectively. Four groups of pressure transmitters 22 are arranged at intervals of 90° in the circumferential direction, and six pressure transmitters 22 are arranged at intervals of a certain distance in the radial direction. The data acquisition device is connected to the pressure transmitter 22 to record the experimental data.

[0010] The present invention also includes the following technical features:

[0011] Optionally, the rotating and static disc test piece is designed as a detachable component, and the diversity of the test can be achieved by changing the part structure. The comb tooth part is designed as a replaceable part, and the comb tooth parts with different numbers of teeth, tooth shapes and rotation radius can be processed. The honeycomb part is designed as a replaceable component, which can be matched with the comb tooth part to form a variety of sealing gaps, so that the influence of different sealing structures on the axial force can be studied.

[0012] The motor and torque meter can provide different speeds required for the test by adjusting the gear box;

[0013] The rotating components are fixed on the base in sequence, and the base is fixed to the ground, which is convenient for centering the test bench, avoiding displacement of the rotating components and reducing vibration. The rotating and static disk test piece is fixed to the base through a support to offset the influence of the axial force on the shell;

[0014] The inlet manifold and the outlet manifold are respectively connected to the inlet and outlet of the housing through pressure hoses and are sealed by threads and O-rings;

[0015] The shell of the rotating and stator disc test piece is connected by bolts and nuts and sealed by adding a graphite gasket;

[0016] The advantages of the present invention are that the rotating and stationary disc test piece is divided into two left and right chambers by a rotating sealing structure, which correspond to the left and right sides of the rotating disc respectively. The pressures of the two chambers can be measured by the pressure transmitters arranged on both sides of the shell. The pressures at different radial positions can be measured by 6 radially arranged pressure transmitters, and the pressure distribution curve along the radial direction can be fitted to obtain the axial force.

[0017] The invention has a simple structure, is fixed by a base, and a motor drives the main shaft to drive the turntable to rotate, forming a turntable-static disk cavity structure, which reduces the complexity of the test bench installation and is easy to maintain;

[0018] The present invention simplifies the real disc cavity structure into a structure of a turntable and a shell through a modeling method. By arranging the pressure transmitter on both sides of the stationary shell, the pressure distribution of the front and rear chambers is measured, and the direct measurement of the axial force is converted into the pressure distribution of the front and rear chambers of the measuring turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention may be better understood by referring to the following description in conjunction with the accompanying drawings, wherein the same or similar reference numerals are used throughout the drawings to represent the same or similar components. The accompanying drawings, together with the following detailed description, are included in and form a part of this specification and are used to further illustrate the functions of the present invention and explain the principles and advantages of the present invention. Among them:

[0020] Figure 1 It is a schematic diagram of a device for measuring the axial force of a turbine disc cavity according to the present invention.

[0021] Figure 2 It is a cross-sectional view of the rotating and stator disc test piece of the present invention.

[0022] Figure 3 It is a side view of the rotating and stator disc test piece of the present invention.

[0023] Among them, 1-base, 2-motor, 3-torque meter, 4-gear box, 5-bearing box, 6-coupling, 7-spindle, 8-air storage box, 9-intake pipe, 10-solenoid valve, 11-flow meter, 12-temperature sensor, 13-pressure sensor, 14-pressure hose, 15-inlet main pipe, 16-outlet main pipe, 17-turntable, 18-shell, 19-support, 20-comb parts, 21-honeycomb parts, 22-pressure transmitter, 23-data acquisition device. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the implementation of the present invention will be described in more detail below with reference to the accompanying drawings in the implementation of the present invention.

[0025] Figure 1 The invention relates to a device for measuring the axial force of a turbine disc cavity according to an embodiment of the present invention, which is mainly composed of a rotating assembly, an air supply system, a rotating and stator disc test piece, and a data measurement system.

[0026] The rotating assembly includes a base 1, a motor 2, a torque meter 3, a gear box 4, a coupling 5, a bearing box 6 and a main shaft 7, wherein the motor, the torque meter and the gear box are mounted and fixed on the base and connected in sequence, the gear box and the main shaft are connected through the coupling, the bearing box is used to fix the main shaft and support the turntable, and the motor power is adjusted to match the torque meter to output the required torque, and the gear box is accelerated to reach the required speed to drive the main shaft to rotate;

[0027] The air supply system includes an air storage tank 8, an air intake pipeline 9, a solenoid valve 10, a flow meter 11, a temperature sensor 12, a pressure sensor 13, a pressure hose 14, an inlet manifold 15, an outlet manifold 16 and a pressure relief valve 24. The air storage tank, the air supply pipeline and the inlet manifold are connected in sequence. The inlet manifold is connected to the shell inlet through a pressure hose, and the shell outlet is connected to the outlet manifold through a pressure hose. The pressure regulating valve is installed at the tail of the outlet manifold, wherein the air supply pipeline is installed with a solenoid valve, a flow meter, a bit density sensor and a pressure sensor in sequence. Compressed air with a certain pressure flows from the air storage tank through the air supply pipeline, the inlet manifold, the rotor and stator test piece and the outlet manifold in sequence, and then is discharged. The switch of the air supply system is controlled by the solenoid valve, the flow rate, temperature and pressure of the system are monitored by the flow meter and the temperature / pressure sensor, and the required outlet back pressure is provided by the pressure relief valve;

[0028] The rotating and stationary disc test piece includes a rotating disc 17, a shell 18, a support 19, a comb tooth part 20 and a honeycomb part 21. The rotating disc is connected to the main shaft through a tendon sheath, and the main shaft drives the rotating disc to rotate at a required speed. The shell is fixed to the base through the support, and the comb tooth part is fixed to the rotating disc through bolts, and forms a rotating sealing structure with the honeycomb part fixed to the shell. Compressed air enters chamber 1 from the shell inlet, flows through the sealing structure into chamber 2, and then flows out from the shell outlet, forming a pressure difference between the two chambers before and after the rotating disc, and the pressure in the chamber acts on the rotating disc as an axial force;

[0029] The data measurement system includes a pressure transmitter 22 and a data acquisition device 23. The pressure transmitters 22 are arranged on both sides of the shell in the circumferential and radial directions respectively. Four groups of pressure transmitters 22 are arranged at 90° intervals in the circumferential direction, and six pressure transmitters 22 are arranged at a certain distance in the radial direction. The data acquisition device is connected to the pressure transmitter 22 to record the experimental data. During the test, pressure data is collected in real time at a certain frequency, and the radial distribution curve of the front and rear chamber pressures is obtained through processing, and the axial force of the disc cavity is obtained through calculation.

[0030] The working process and principle of the embodiment of the present invention are described below to facilitate understanding of the advantages of the present invention. When the device is used to carry out the axial force measurement test of the turbine disc cavity, the solenoid valve is first opened, and the compressed air fills the air supply system and the rotor and stator test piece and reaches the required back pressure through the pressure relief valve control, then the motor is turned on and adjusted to the required speed. After the system runs stably, the data acquisition device is turned on to measure the pressure data, and then the axial force is calculated.

[0031] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

Claims

1. A device for measuring the axial force of a turbine disc cavity, It is characterized in that include: The base (1) is located at the bottom of the entire device and plays a role in supporting, fixing, centering and shock absorbing the entire device, and at the same time fixes the position of the motor, torque meter, gear box, bearing box and rotor and stator base; The motor (2) is located at the starting position on the base and is connected to the torque meter to provide driving force for the entire turbine disc cavity test bench; The torque meter (3) is located on the base, with the left end connected to the motor and the right end connected to the gear box, and is used to measure the torque; The gear box (4) is located on the base, the left end of which is connected to the torque meter, and the right end of which is connected to the main shaft through a coupling, so as to adjust the main shaft speed to reach the speed required for the test; A bearing box (5) is located between the gear box and the rotor and stator test piece on the base, and is used to fix the main shaft and provide lubrication and cooling for the bearing; The main shaft (7) is located between the gear box and the rotating and stator test piece, is installed inside the bearing box, and has a left end connected to the gear box through a coupling, and a right end connected to the rotating disk, driving the rotating disk to rotate at high speed; The outlet main pipe (16) is located at the left end of the rotor and stator test piece, connected to the shell outlet through a pressure hose, and the outlet pressure is controlled by a pressure relief valve at the tail; An inlet manifold (15) is located at the right end of the rotor-stator test piece, the left end of which is connected to the shell inlet through a high-pressure pipeline, and the right end of which is connected to the air supply pipeline; The air storage tank (8) is located at the end of the device and is filled with compressed air. The switch is controlled by a solenoid valve, and the flow rate, temperature and pressure are monitored by a flow meter, a temperature sensor and a pressure sensor. A support (19) is located at the end of the base and fixed on the base for supporting and fixing the shell; The pressure transmitter (22) is located on both sides of the inlet and outlet of the shell wall, arranged in the circumferential direction and radial direction, and is used to measure the pressure of the chambers before and after the turntable; A data acquisition device (23), connected to the pressure transmitter, for recording experimental data; The rotor assembly consists of a motor, a torque meter, a gear box, a bearing box and a main shaft. The power is adjusted to drive the turntable to rotate at a stable and controllable speed. The motor and torque meter can provide different speeds required for the test by adjusting the gear box. The rotating and stator disc test piece comprises a rotating disc, a shell, a support, a comb tooth part and a honeycomb part; the rotating and stator disc test piece is divided into two left and right chambers by a rotating sealing structure, corresponding to the left and right sides of the rotating disc respectively, and the pressures of the two chambers are measured by pressure transmitters (22) arranged on both sides of the shell, and the pressures at different radial positions are measured by multiple pressure transmitters (22) arranged radially, and the pressure distribution curve along the radial direction is obtained by fitting, and the axial force is calculated; The turntable is connected to the main shaft through a tendon sheath, and the main shaft drives the turntable to rotate at a required speed. The shell is fixed to the base through a support, and the comb tooth parts are fixed to the turntable through bolts, forming a rotating sealing structure with the honeycomb parts fixed on the shell. Compressed air enters the first chamber from the shell inlet, flows through the sealing structure into the second chamber, and then flows out from the shell outlet, forming a pressure difference between the two chambers before and after the turntable, and the pressure in the chamber acts on the turntable as an axial force.

2. The device for measuring the axial force of a turbine disc cavity according to claim 1, It is characterized in that The comb tooth structure on the turntable is a replaceable part, which is connected to the turntable by bolts and cooperates with the honeycomb structure on the shell to form a rotating sealing structure, which is used to study the influence of the sealing structure on the axial force of the turbine disc cavity.

3. The device for measuring the axial force of a turbine disc cavity according to claim 1, It is characterized in that The air intake circuit, which consists of an air storage box, an air intake pipeline and an inlet manifold, provides air with the required temperature and pressure for the inlet of the rotating-static test piece.

4. The device for measuring the axial force of a turbine disc cavity according to claim 1, It is characterized in that The outlet manifold cooperates with the pressure regulating valve at the tail end to provide the required back pressure for the outlet of the rotor-stator test piece.

5. The device for measuring the axial force of a turbine disc cavity according to claim 1, It is characterized in that The pressure transmitters are arranged radially and circumferentially on the shell wall, with 4 groups of pressure transmitters arranged circumferentially at 90° intervals, and 6 pressure transmitters in each group arranged radially at a certain distance, for a total of 48 pressure transmitters for measuring the pressures of the front and rear chambers.

6. The device for measuring the axial force of a turbine disc cavity according to claim 1, It is characterized in that The data acquisition device is connected to the pressure transmitter and is used to record pressure data.

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