Detection method and device for limit axial displacement test of supercharger rotor

Abstract

According to the detection method and device for the limit axial displacement test of the supercharger rotor, the gas pressure in a gas compressor cavity and a turbine cavity is changed by adjusting the inlet and outlet pressure of the gas compressor and the turbine of the supercharger, so that the states of the high-vortex-end axial force and the high-pressure-end axial force of the supercharger are simulated; and the supercharger rotor is circularly pushed to a vortex end and a gas compressor end, and a high-speed cycle test is carried out, so that the purpose of testing the limit axial displacement of the supercharger rotor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of supercharger testing, and in particular to a detection method and device for a supercharger rotor limit axial displacement test. Background Art

[0002] Exhaust gas turbocharger technology can effectively save energy and reduce emissions, and is an important way to restore engine power in plateau areas. It is widely used in commercial vehicles, passenger cars, construction machinery and other fields.

[0003] With the widespread adoption of turbocharging technology, the requirements for supercharger reliability are becoming increasingly stringent. During operation, the imbalance of thrust exerted on the rotor by the compressor and turbine ends of the supercharger generates an axial force along the rotor axis. This axial force pushes the rotor toward the compressor or turbine end, causing hard contact between the supercharger's core rotating components.

[0004] The supercharger's rotor and core components rotate at high speeds during operation. Hard contact can directly damage these components. Therefore, testing and evaluating the supercharger's rotor's ultimate axial displacement has become a pressing issue. Summary of the Invention

[0005] One of the technical problems to be solved by the present invention is to provide a detection method for the supercharger rotor limit axial displacement test for how to test and evaluate the supercharger rotor limit axial displacement test, so as to meet the needs of the supercharger rotor limit axial displacement test and improve the test efficiency.

[0006] The second technical problem to be solved by the present invention is to provide a detection device for the supercharger rotor limit axial displacement test in order to test and evaluate the supercharger rotor limit axial displacement test, so as to meet the needs of the supercharger rotor limit axial displacement test and improve the test efficiency.

[0007] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0008] A method for detecting a supercharger rotor limit axial displacement test comprises the following steps:

[0009] Step 1: When the turbocharger is running at the highest speed, detect the compressor impeller front pressure, compressor impeller back pressure, turbine wheel back pressure, turbine front pressure and the current turbocharger rotor axial displacement;

[0010] Step 2: Calculate and judge the test results to determine whether the axial displacement of the supercharger rotor reaches the maximum axial displacement of the compressor rotor;

[0011] Step 3: If it is determined that the axial displacement of the supercharger compressor rotor has not reached the maximum, then change the compressor impeller front pressure, compressor impeller back pressure, turbine wheel back pressure, and turbine front pressure so that the compressor rotor axial displacement reaches the maximum while the supercharger is running at the highest operating speed. At the same time, record the compressor impeller front pressure value, compressor impeller back pressure value, turbine wheel back pressure value, and turbine front pressure value;

[0012] Step 4: Adjust the turbocharger operating conditions according to steps 2 and 3 until the turbocharger is running at the highest operating speed and the turbine rotor axial displacement reaches the maximum. At the same time, record the compressor impeller pressure, compressor impeller back pressure, turbine wheel back pressure, and turbine inlet pressure.

[0013] Step 5: Based on the compressor impeller front pressure values, compressor impeller back pressure values, turbine wheel back pressure values, and turbine front pressure values ​​recorded in steps 3 and 4, quickly switch the turbocharger from the maximum axial displacement operating condition of the compressor end rotor to the maximum axial displacement operating condition of the turbine end compressor end rotor, and perform a cyclic test;

[0014] Step 6: Analyze the test results and determine whether the rotor displacement is abnormal. If it is determined that the rotor displacement is abnormal, stop the test and record the test results.

[0015] In a preferred embodiment of the present invention, the compressor impeller front pressure value, the compressor impeller back pressure value, the turbine wheel back pressure value, and the turbine front pressure value are detected by a compressor impeller front pressure detector, a compressor impeller back pressure detector, a turbine wheel back pressure detector, and a turbine front pressure detector.

[0016] In a preferred embodiment of the present invention, the axial displacement of the supercharger rotor is detected by a rotor axial displacement detector.

[0017] In a preferred embodiment of the present invention, the compressor impeller front pressure value is adjusted by the opening of the compressor intake regulating valve, the compressor impeller back pressure value is adjusted by the opening of the compressor exhaust regulating valve, the turbine front pressure value is adjusted by the opening of the turbine intake regulating valve, and the turbine wheel back pressure value is adjusted by the turbine exhaust valve.

[0018] A device for testing the ultimate axial displacement of a supercharger rotor, comprising:

[0019] A compressor impeller front pressure detector for detecting the compressor impeller front pressure value;

[0020] A compressor impeller back pressure detector for detecting the compressor impeller back pressure value;

[0021] A turbine wheel back pressure detector for detecting a turbine wheel back pressure value;

[0022] A turbine inlet pressure detector for detecting a turbine inlet pressure value;

[0023] A compressor inlet regulating valve for adjusting the pressure before the turbine impeller;

[0024] A compressor exhaust regulating valve for regulating the compressor impeller back pressure value;

[0025] A turbine inlet regulating valve for adjusting the pressure before the turbine;

[0026] A turbine exhaust valve for adjusting the turbine wheel back pressure value;

[0027] a rotor axial displacement detector for detecting the axial displacement of the supercharger rotor;

[0028] An industrial control computer with built-in analysis software, the industrial control computer is connected to the compressor impeller front pressure detector, the compressor impeller back pressure detector, the turbine wheel back pressure detector, the turbine front pressure detector and the rotor axial displacement detector signal, and is control-connected to the compressor intake regulating valve, the compressor exhaust regulating valve, the turbine intake regulating valve and the turbine exhaust valve.

[0029] The working principle of the present invention is to simulate the axial force at the high-turbulence end and the high-pressure end of the supercharger by adjusting the inlet and outlet pressures of the supercharger's compressor and turbine, changing the gas pressure inside the compressor cavity and the turbine cavity, and cyclically push the supercharger rotor toward the turbulence end and the compressor end, and perform a high-speed cycle test to achieve the test purpose of testing the ultimate axial displacement of the supercharger rotor.

[0030] Specifically, by adjusting the opening of the turbocharger's compressor inlet valve and compressor outlet exhaust valve, the turbocharger's own operation is used to extract air from the turbocharger's compressor chamber or draw outside air into the compressor chamber to control the pressure in front of and behind the turbocharger's impeller, thereby controlling the thrust of the turbocharger's compressor end on the rotor. By adjusting the opening of the turbocharger's turbine inlet valve and turbine outlet exhaust valve, the turbocharger's speed and the pressure in front of and behind the turbine are controlled, thereby controlling the thrust of the turbocharger's turbine end on the rotor.

[0031] During the test, if the supercharger's operating conditions need to be adjusted, the compressor inlet and exhaust valve openings are adjusted to change the size of the supercharger's compressor impeller, thereby varying the thrust exerted by the compressor on the rotor shaft. The turbine inlet and exhaust valve openings are adjusted to control the supercharger's speed and the pressures before and after the turbine wheel, maintaining the supercharger at its maximum operating speed while varying the thrust exerted by the turbine on the rotor shaft. The proposed supercharger rotor limit axial displacement test method is simple and easy to operate.

[0032] This invention provides a regulating device and method for testing supercharger axial force resistance, effectively detecting the supercharger's rotor's ultimate axial displacement and its variations. This device effectively controls the supercharger's rotor thrust parameters and comprehensively simulates the supercharger's rotor's operating conditions, including its compression and turbine end ultimate displacements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the device for the supercharger rotor limit axial displacement test of the present invention.

[0034] Figure 2 It is a schematic diagram of the structure of the device for the supercharger rotor limit axial displacement test of the present invention.

[0035] Figure 3 for Figure 2 An enlarged schematic diagram of point I.

[0036] Figure 2 and Figure 3 Middle: 1- compressor impeller front pressure detector, 2- compressor impeller back pressure detector, 3- turbine wheel back pressure detector, 4- turbine front pressure detector, 5- rotor axial displacement detector, 6- turbine inlet control valve, 7- turbine exhaust valve, 8- compressor inlet control valve, 9- compressor exhaust control valve, 10- industrial control computer. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to the accompanying drawings and implementation process.

[0038] See also Figures 1 to 3 The figure shows a device for testing the maximum axial displacement of a supercharger rotor, comprising a compressor impeller front pressure probe 1, a compressor impeller back pressure probe 2, a turbine wheel back pressure probe 3, a turbine front pressure probe 4, a rotor axial displacement probe 5, a turbine inlet regulating valve 6, a turbine exhaust valve 7, a compressor inlet regulating valve 8, a compressor exhaust regulating valve 9, and an industrial control computer 10. The device is used to test the maximum axial displacement of the rotor of a peripheral supercharger during use.

[0039] Detection system: compressor impeller front pressure detector 1, compressor impeller back pressure detector 2, turbine wheel back pressure detector 3, turbine front pressure detector 4, rotor axial displacement detector 5, its main function is to detect the operating condition of the supercharger and the axial displacement of the supercharger rotor, and transmit the detection results to the industrial control computer 10.

[0040] Analysis and judgment system: The main function of the industrial control computer 10 is to receive the test results transmitted by the detection system, analyze the test results through the software on the industrial control computer 10, and judge whether the operating conditions of the supercharger meet the test requirements and whether the axial displacement of the supercharger rotor exceeds the range. If the operating conditions do not meet the test requirements, an instruction is issued to the control and adjustment system to adjust the turbine intake regulating valve 6, the turbine exhaust valve 7, the compressor intake regulating valve 8, and the compressor exhaust regulating valve 9 to make the supercharger operating conditions meet the test requirements. If it is judged that the axial displacement of the supercharger rotor exceeds the range, it is determined that the supercharger has a fault, and the test is stopped and the test results are recorded.

[0041] The control and adjustment system primarily regulates the opening of the control device valves, thereby changing the thrust exerted on the rotor by the compressor and turbine. The turbine inlet control valve 6, turbine exhaust valve 7, compressor inlet control valve 8, and compressor exhaust control valve 9 receive control commands from the industrial control computer 10 and open or close to a certain degree as instructed, completing a single adjustment of the turbocharger's operating conditions. Repeated adjustments are then performed until the turbocharger's operating conditions meet test requirements.

[0042] The invention provides a method for detecting a supercharger rotor limit axial displacement test, comprising the following steps:

[0043] Step 1: When the supercharger is running at the highest operating speed, the compressor impeller front pressure detector 1, the compressor impeller back pressure detector 2, the turbine wheel back pressure detector 3, and the turbine front pressure detector 4 are used to detect the compressor impeller front pressure, the compressor impeller back pressure, the turbine wheel back pressure, and the turbine front pressure respectively, and the rotor axial displacement detector 5 is used to detect the current rotor axial displacement of the supercharger;

[0044] Step 2: The industrial control computer 10 calculates and judges the detection result to determine whether the axial displacement of the supercharger rotor reaches the maximum axial displacement of the compressor rotor;

[0045] Step 3: If it is determined that the axial displacement of the supercharger compressor rotor has not reached the maximum, the compressor impeller front pressure, the compressor impeller back pressure, the turbine wheel back pressure, and the turbine front pressure are changed through the turbine inlet regulating valve 6, the turbine exhaust valve 7, the compressor inlet regulating valve 8, and the compressor exhaust regulating valve 9, so that the axial displacement of the compressor rotor reaches the maximum while the supercharger is running at the highest operating speed, and the openings of the turbine inlet regulating valve 6, the turbine exhaust valve 7, the compressor inlet regulating valve 8, and the compressor exhaust regulating valve 9 are recorded at the same time;

[0046] Step 4: Adjust the operating conditions of the supercharger according to the method of steps 2 and 3 until the supercharger is running at the highest operating speed and the axial displacement of the turbine end rotor reaches the maximum. At the same time, record the openings of the turbine inlet regulating valve 6, the turbine exhaust valve 7, the compressor inlet regulating valve 8, and the compressor exhaust regulating valve 9;

[0047] Step 5: Based on the openings of the turbine inlet regulating valve 6, the turbine exhaust valve 7, the compressor inlet regulating valve 8, and the compressor exhaust regulating valve 9 recorded in Steps 3 and 4, the turbocharger is quickly switched from the operating condition of maximum axial displacement of the compressor rotor to the operating condition of maximum axial displacement of the turbine rotor and a cyclic test is performed;

[0048] Step 6: Analyze the test results and determine whether the rotor displacement is abnormal. If it is determined that the rotor displacement is abnormal, stop the test and record the test results.

Claims

1. A method for testing the ultimate axial displacement of a supercharger rotor, characterized by: The steps include: Step 1: When the turbocharger is running at the highest speed, detect the compressor impeller front pressure, compressor impeller back pressure, turbine wheel back pressure, turbine front pressure and the current turbocharger rotor axial displacement; Step 2: Calculate and judge the test results to determine whether the axial displacement of the supercharger rotor reaches the maximum axial displacement of the compressor rotor; Step 3: If it is determined that the axial displacement of the supercharger compressor rotor has not reached the maximum, then change the compressor impeller front pressure, compressor impeller back pressure, turbine wheel back pressure, and turbine front pressure so that the compressor rotor axial displacement reaches the maximum while the supercharger is running at the highest operating speed. At the same time, record the compressor impeller front pressure value, compressor impeller back pressure value, turbine wheel back pressure value, and turbine front pressure value; Step 4: Adjust the turbocharger operating conditions according to steps 2 and 3 until the turbocharger is running at the highest operating speed and the turbine rotor axial displacement reaches the maximum. At the same time, record the compressor impeller pressure, compressor impeller back pressure, turbine wheel back pressure, and turbine inlet pressure. Step 5: Based on the compressor impeller front pressure values, compressor impeller back pressure values, turbine wheel back pressure values, and turbine front pressure values ​​recorded in steps 3 and 4, quickly switch the turbocharger from the maximum axial displacement operating condition of the compressor end rotor to the maximum axial displacement operating condition of the turbine end compressor end rotor, and perform a cyclic test; Step 6: Analyze the test results and determine whether the rotor displacement is abnormal. If it is determined that the rotor displacement is abnormal, stop the test and record the test results.

2. The method for detecting the supercharger rotor limit axial displacement test according to claim 1, characterized in that: The compressor impeller front pressure value, compressor impeller back pressure value, turbine wheel back pressure value, and turbine front pressure value are detected by a compressor impeller front pressure detector, a compressor impeller back pressure detector, a turbine wheel back pressure detector, and a turbine front pressure detector.

3. The method for detecting the supercharger rotor limit axial displacement test according to claim 1, characterized in that: The axial displacement of the supercharger rotor is detected by a rotor axial displacement detector.

4. The method for detecting the supercharger rotor limit axial displacement test according to claim 1, characterized in that: The compressor impeller front pressure value is adjusted by the opening of the compressor intake regulating valve, the compressor impeller back pressure value is adjusted by the opening of the compressor exhaust regulating valve, the turbine front pressure value is adjusted by the opening of the turbine intake regulating valve, and the turbine wheel back pressure value is adjusted by the turbine exhaust valve.

5. A device for testing the ultimate axial displacement of a supercharger rotor, characterized in that: include: A compressor impeller front pressure detector for detecting the compressor impeller front pressure value; A compressor impeller back pressure detector for detecting the compressor impeller back pressure value; A turbine wheel back pressure detector for detecting a turbine wheel back pressure value; A turbine inlet pressure detector for detecting a turbine inlet pressure value; A compressor inlet regulating valve for adjusting the pressure before the turbine impeller; A compressor exhaust regulating valve for regulating the compressor impeller back pressure value; A turbine inlet regulating valve for adjusting the pressure before the turbine; A turbine exhaust valve for adjusting the turbine wheel back pressure value; a rotor axial displacement detector for detecting the axial displacement of the supercharger rotor; An industrial control computer with built-in analysis software, the industrial control computer is connected to the compressor impeller front pressure detector, the compressor impeller back pressure detector, the turbine wheel back pressure detector, the turbine front pressure detector and the rotor axial displacement detector signal, and is control-connected to the compressor intake regulating valve, the compressor exhaust regulating valve, the turbine intake regulating valve and the turbine exhaust valve.

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