Design method and structure for reducing synchronous noise of turbocharger rotor

Abstract

The present invention provides a design method for reducing the synchronous noise of a turbocharger rotor, comprising: determining key parameters causing the synchronous noise of the turbocharger rotor, designing a control strategy for the key parameters; the control strategy for the key parameters includes linking the key parameters to the structure and parameters of the de-quantized part of the relevant de-quantized parts; establishing an influence factor equation between the synchronous noise of the turbocharger rotor and the key parameters; conducting a sample trial production according to the preliminary setting of the key parameters; conducting a sample test and result analysis, including comparing and analyzing the measured noise with the noise calculated by the influence factor equation, thereby calibrating the influence factor equation; for a finished turbocharger, determining the key parameters for controlling the synchronous noise of the turbocharger rotor according to the calibrated influence factor equation and the target noise of the finished turbocharger. The present invention realizes precise design and control of the synchronous noise of the turbocharger rotor.

Description

Technical Field

[0001] The invention relates to a turbocharger technology and belongs to the field of thermal energy and power machinery, in particular to a design method for reducing synchronous noise of a turbocharger rotor. Background Art

[0002] Turbochargers have been widely used in the field of internal combustion engines to increase the power density of internal combustion engines, while improving the fuel economy of internal combustion engines and reducing emissions.

[0003] Noise pollution, as one of the three major environmental problems in modern society, has attracted great attention from the international community. As one of the important noise sources of the whole vehicle, the engine turbocharger noise has a strong negative impact on the sound quality of the whole vehicle and even the noise index of the environment due to its high-frequency pure sound characteristics.

[0004] There are many types of turbocharger noise. Among them, the supercharger rotor synchronous noise is a kind of noise that accompanies the supercharger from low speed to high speed. The sound is relatively sharp and is most likely to be highlighted during vehicle operation, posing a great challenge to driving comfort.

[0005] like Figure 1 The figure shows a typical supercharger rotor system, including a locking nut 1, an impeller 2, and a plurality of blades 2a on the impeller 2. The impeller 2 is mounted on one end of a rotating shaft 5 for rotation. The rotating shaft 5 is supported in the inner hole of the intermediate body 3 by two radial bearings 4 through an oil film. A turbine 6 is mounted on the other end of the rotating shaft 5. When the exhaust gas of the engine passes through the turbine 6 on the rotating shaft 5 through the flow channel, the kinetic energy and thermal energy of the gas are converted into mechanical energy of rotation, thereby driving the rotating shaft 5 and the locking nut 1 and the impeller 2 locked on the rotating shaft to rotate. During the rotation of the rotor system, a noise with the same frequency as the supercharger speed mentioned above is generated, which is called the supercharger rotor synchronous noise. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a design method for reducing the synchronous noise of a turbocharger rotor and a structure for reducing the synchronous noise of a turbocharger rotor. The technical solution adopted by the present invention is:

[0007] A design method for reducing synchronous noise of a turbocharger rotor, comprising:

[0008] Determine the key parameters that cause the synchronous noise of the supercharger rotor, and design a control strategy for the key parameters; the control strategy for the key parameters includes the structure and parameters of the de-massing part that links the key parameters to the relevant de-massing parts;

[0009] Establish the influencing factor equation between the supercharger rotor synchronous noise and key parameters;

[0010] Produce prototypes based on the initial setting of key parameters;

[0011] Conduct sample testing and result analysis, including comparing the measured noise with the noise calculated using the influence factor equation to calibrate the influence factor equation;

[0012] For the finished turbocharger, the key parameters for controlling the synchronous noise of the turbocharger rotor are determined based on the calibrated influencing factor equation and the target noise of the finished turbocharger.

[0013] Furthermore, the weight-removing parts include a locking nut and an impeller; the key parameters include the unbalance on the locking nut and the unbalance on the impeller

[0014] The removed amount on the lock nut includes the unbalanced amount on the lock nut. The amount of imbalance that needs to be removed corresponding to the 180-degree position

[0015] The amount removed from the impeller includes the unbalanced amount on the impeller 2 The amount of imbalance that needs to be removed at the corresponding 180-degree position

[0016] Furthermore, the debossed portion on the locking nut includes a debossed pit; parameters of the debossed pit on the locking nut include a debossed pit depth d1, a debossed pit width w1 and a debossed pit length L1.

[0017] Furthermore, the deburred portion on the impeller includes a deburred pit disposed between two adjacent blades; parameters of the deburred pit on the impeller include a deburred position diameter 2r2, a deburred size diameter a2, and a deburred depth d2.

[0018] Furthermore, the influencing factor equation between the turbocharger rotor synchronous noise f and the key parameters is shown in formula (1):

[0019]

[0020] Where a is a constant term, λ1 is the unbalance at the locking nut The influencing factor on the synchronous noise of the rotor; λ2 is the unbalance at the impeller Factors affecting rotor synchronous noise.

[0021] Furthermore, the influencing factor equations are established respectively according to different speed sections of the supercharger.

[0022] Furthermore, the value of a is between 50 and 100, the value of λ1 is between 0 and 30, and the value of λ2 is between 0 and 30.

[0023] The present invention also proposes a structure for reducing synchronous noise of a turbocharger rotor, wherein the turbocharger comprises a locking nut, an impeller, and the impeller comprises a plurality of blades. The impeller is mounted at one end of a rotating shaft for rotation, and the rotating shaft is supported in an intermediate body hole by two radial bearings through an oil film; a turbine is mounted at the other end of the rotating shaft; the main improvement thereof is that:

[0024] The parts to be removed include the lock nut and the impeller;

[0025] The removed amount on the lock nut includes the unbalanced amount on the lock nut. The amount of imbalance that needs to be removed corresponding to the 180-degree position

[0026] The amount removed from the impeller includes the unbalanced amount on the impeller. The amount of imbalance that needs to be removed at the corresponding 180-degree position

[0027] Furthermore, the debossed portion on the locking nut includes a debossed pit; parameters of the debossed pit on the locking nut include a debossed pit depth d1, a debossed pit width w1 and a debossed pit length L1.

[0028] Furthermore, the deburred portion on the impeller includes a deburred pit disposed between two adjacent blades; parameters of the deburred pit on the impeller include a deburred position diameter 2r2, a deburred size diameter a2, and a deburred depth d2.

[0029] The advantages of the present invention are: creating a logical and reasonable technical method for reducing the synchronous noise of the turbocharger rotor, creatively citing the key parameters and influencing factor equations, so that the supercharger rotor synchronous noise target can be effectively set in the design stage, and the key parameters can be controlled, so as to achieve the effect of reducing and controlling the synchronous noise of the supercharger rotor. The control strategy of the key parameters includes the key parameters linking to the structure and parameters of the de-quantized part of the relevant de-quantized parts; establishing the relationship between the synchronous noise of the supercharger rotor and the structural parameters of the supercharger parts; the method of the present invention is systematic, logical, operable and accurate, and realizes the precise design and control of the synchronous noise of the supercharger rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of a supercharger rotor system in an embodiment of the present invention.

[0031] Figure 2 The figure is a flow chart of a design method in an embodiment of the present invention.

[0032] Figure 3 Schematic diagram of key parameters in an embodiment of the present invention.

[0033] Figure 4a and Figure 4b It is a schematic diagram of the structure and parameters of the de-gauging part of the locking nut in an embodiment of the present invention.

[0034] Figure 5a , 5b , 5c, and 5d are schematic diagrams of the structure and parameters of the de-metering part of the impeller in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0036] The embodiment of the present invention provides a design method for reducing synchronous noise of a turbocharger rotor, comprising:

[0037] Determine the key parameters that cause the synchronous noise of the supercharger rotor, and design a control strategy for the key parameters; the control strategy for the key parameters includes the structure and parameters of the de-massing part that links the key parameters to the relevant de-massing parts;

[0038] Establish the influencing factor equation between the supercharger rotor synchronous noise and key parameters;

[0039] Produce prototypes based on the initial setting of key parameters;

[0040] Conduct sample testing and result analysis, including comparing the measured noise with the noise calculated using the influence factor equation to calibrate the influence factor equation;

[0041] For the finished turbocharger, the key parameters for controlling the synchronous noise of the turbocharger rotor are determined based on the calibrated influencing factor equation and the target noise of the finished turbocharger.

[0042] A typical supercharger rotor system, such as Figure 1 As shown, it includes a locking nut 1, an impeller 2, and the impeller 2 includes multiple blades 2a. The impeller 2 is assembled at one end of a rotating shaft 5 for rotation. The rotating shaft 5 is supported in the inner hole of the intermediate body 3 by two radial bearings 4 through an oil film; a turbine 6 is installed at the other end of the rotating shaft 5; when the exhaust gas of the engine passes through the turbine 6 on the rotating shaft 5 through the flow channel, the kinetic energy and thermal energy of the gas are converted into rotational mechanical energy, thereby driving the rotating shaft 5 and the locking nut 1 and the impeller 2 locked on the rotating shaft to rotate. During the rotation of the rotor system, a noise with the same frequency as the supercharger speed mentioned above will be generated, which is called the supercharger rotor synchronous noise;

[0043] In this embodiment, a design method flow for reducing synchronous noise of a turbocharger rotor is specifically described, including target noise, historical data, key parameter analysis, influencing factor equations, preliminary setting of key parameters, prototype trial production, prototype testing and result analysis, and key parameter design control, etc.;

[0044] In some embodiments, the weight-removing parts include a locking nut 1 and an impeller 2; the key parameters include the unbalance amount on the locking nut 1 and the unbalance on impeller 2

[0045] In a specific implementation, the unbalance on the locking nut 1 It is the amount of imbalance removed at the corresponding 180 degree position To balance the lock nut;

[0046] In a specific implementation, the unbalance on the impeller 2 It is the amount of imbalance removed at the corresponding 180 degree position To balance the impeller;

[0047] In some embodiments, the de-weighted portion on the locking nut 1 includes an unbalanced portion on the locking nut 1. The amount of imbalance that needs to be removed corresponding to the 180-degree position The degassed portion on the locking nut 1 may be a degassed pit 1a; its shape is various, such as a fan-shaped, semicircular, etc., and the number of the degassed pits 1a on the locking nut 1 may be one or more; the parameters of the degassed pit 1a on the locking nut 1 include the depth d1 of the degassed pit 1a, the width w1 of the degassed pit 1a, and the length L1 of the degassed pit 1a;

[0048] In some embodiments, the removed portion on the impeller 2 includes the unbalanced portion on the impeller 2. The amount of imbalance that needs to be removed at the corresponding 180-degree position The de-gassed portion on the impeller 2 may be a de-gassed pit 2c at a position 2b between two adjacent blades 2a; its shape is various, such as a spherical shape, a raindrop shape, etc., and the number of the de-gassed pits 2c on the impeller 2 may be one or more; the parameters of the de-gassed pits 2c on the impeller 2 include a de-gassed position diameter 2r2, a de-gassed size diameter a2, and a de-gassed depth d2;

[0049] Based on the historical data, the influencing factor equation between the turbocharger rotor synchronous noise f and key parameters is established, as shown in formula (1):

[0050]

[0051] Where a is a constant term between 50 and 100, and λ1 is the unbalance at the locking nut. The influencing factor on the synchronous noise of the rotor; λ2 is the unbalance at the impeller Factors affecting rotor synchronous noise;

[0052] In some embodiments, the influencing factor equation can be analyzed in different supercharger speed sections, such as a low supercharger speed section of 0 to 80,000 rpm, a medium supercharger speed section of 80,000 rpm to 150,000 rpm, and a medium-high supercharger speed section of 150,000 rpm to 250,000 rpm. For each specific speed section, the supercharger rotor synchronous noise f and the key parameters are established. and The equation between;

[0053] In some embodiments, the unbalance at the locking nut The value of the factor λ1 affecting the rotor synchronous noise is between 0 and 30;

[0054] In some embodiments, the unbalance at the impeller The value of the factor λ2 affecting the rotor synchronous noise is between 0 and 30;

[0055] Before the prototype is manufactured, the key parameters are initially set, and the range of the key parameters is preliminarily confirmed based on the influencing factor equation and the target noise, so as to provide guidance for the subsequent prototype manufacturing and testing. This can effectively and accurately define the research scope and reduce unnecessary duplication and waste of resources.

[0056] Then, the prototype is trial-produced according to the preliminary setting of key parameters, that is, the prototype is trial-produced within the defined range of key parameters, so that the number of prototypes can be accurately locked and resources can be saved;

[0057] After the prototype is manufactured, the prototype is tested and the results are analyzed, including comparing the measured noise with the noise calculated by the influence factor equation, so as to calibrate the influence factor equation; that is, calibrate a, λ1, λ2 in the influence factor equation;

[0058] For a certain type of turbocharger, after the influencing factor equation is calibrated, the key parameters for controlling the synchronous noise of the turbocharger rotor can be determined based on the target noise of this type of turbocharger and the calibrated influencing factor equation. and This will allow you to get the amount of imbalance that needs to be removed from the locking nut. and the amount of imbalance that needs to be removed on the impeller The precise design and control of the key parameters of the supercharger rotor synchronous noise are achieved to meet the set supercharger rotor synchronous noise target.

[0059] In some embodiments, for example, when the supercharger speed is 120,000 rpm, the value of constant a is 67, λ1 is 1.78, and λ2 is 6.77, then the influencing factor equation between the supercharger rotor synchronous noise f and the key parameters is:

[0060]

[0061] By specifically implementing the design method for reducing the synchronous noise of a turbocharger rotor proposed in the present invention, the synchronous noise of the turbocharger rotor is reduced by an average of 10 decibels; the rotor synchronous noise in the low turbocharger speed area is reduced by 6 decibels; and in the high turbocharger speed area, the maximum reduction in the synchronous noise of the turbocharger rotor is 14 decibels.

[0062] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A design method for reducing synchronous noise of a turbocharger rotor, characterized in that: include: Determine the key parameters that cause the synchronous noise of the supercharger rotor and design the control strategy of the key parameters; The control strategy of the key parameters includes the structure and parameters of the de-quantization part of the key parameters linked to the relevant de-quantization parts; Establish the influencing factor equation between the supercharger rotor synchronous noise and key parameters; Produce prototypes based on the initial setting of key parameters; Conduct sample testing and result analysis, including comparing the measured noise with the noise calculated using the influence factor equation to calibrate the influence factor equation; For the finished turbocharger, the key parameters for controlling the synchronous noise of the turbocharger rotor are determined based on the calibrated influencing factor equation and the target noise of the finished turbocharger.

2. The design method for reducing synchronous noise of a turbocharger rotor according to claim 1, characterized in that: The weight-removing parts include a locking nut (1) and an impeller (2); the key parameters include an unbalanced amount on the locking nut (1) and the unbalance on the impeller (2) The removed portion of the lock nut (1) includes the unbalanced portion of the lock nut (1). The amount of imbalance that needs to be removed corresponding to the 180-degree position The removed portion on the impeller (2) includes the unbalanced portion on the impeller (2) The amount of imbalance that needs to be removed at the corresponding 180-degree position 3. The design method for reducing synchronous noise of a turbocharger rotor according to claim 2, characterized in that: The debossed portion on the locking nut (1) includes a debossed pit (1a); parameters of the debossed pit (1a) on the locking nut (1) include a debossed pit depth d1, a debossed pit width w1 and a debossed pit length L1.

4. The design method for reducing synchronous noise of a turbocharger rotor according to claim 2, characterized in that: The deburred portion on the impeller (2) comprises a deburred recess (2c) arranged at a position (2b) between two adjacent blades (2a); parameters of the deburred recess (2c) on the impeller (2) include a deburred position diameter 2r2, a deburred size diameter a2 and a deburred depth d2.

5. The design method for reducing synchronous noise of a turbocharger rotor according to any one of claims 1 to 4, characterized in that: The influencing factor equation between the turbocharger rotor synchronous noise f and key parameters is shown in formula (1): Where a is a constant term, λ1 is the unbalance at the locking nut The influencing factor on the synchronous noise of the rotor; λ2 is the unbalance at the impeller Factors affecting rotor synchronous noise.

6. The design method for reducing synchronous noise of a turbocharger rotor according to claim 5, characterized in that: The influencing factor equations are established respectively according to different speed sections of the supercharger.

7. The design method for reducing synchronous noise of a turbocharger rotor according to claim 5, characterized in that: The value of a is between 50 and 100, the value of λ1 is between 0 and 30, and the value of λ2 is between 0 and 30.

8. A structure for reducing synchronous noise of a turbocharger rotor, the turbocharger comprising a locking nut (1), an impeller (2), the impeller (2) comprising a plurality of blades (2a), the impeller (2) being mounted on one end of a rotating shaft (5) for rotation, the rotating shaft (5) being supported in an inner hole of an intermediate body (3) by two radial bearings (4) through an oil film; a turbine (6) being mounted on the other end of the rotating shaft (5); characterized in that: The removed parts include a locking nut (1) and an impeller (2); The removed portion of the lock nut (1) includes the unbalanced portion of the lock nut (1). The amount of imbalance that needs to be removed corresponding to the 180-degree position The removed portion on the impeller (2) includes the unbalanced portion on the impeller (2) The amount of imbalance that needs to be removed at the corresponding 180-degree position 9. The structure for reducing synchronous noise of a turbocharger rotor according to claim 8, characterized in that: The debossed portion on the locking nut (1) includes a debossed pit (1a); parameters of the debossed pit (1a) on the locking nut (1) include a debossed pit depth d1, a debossed pit width w1 and a debossed pit length L1.

10. The structure for reducing synchronous noise of a turbocharger rotor according to claim 8, characterized in that: The deburred portion on the impeller (2) comprises a deburred recess (2c) arranged at a position (2b) between two adjacent blades (2a); parameters of the deburred recess (2c) on the impeller (2) include a deburred position diameter 2r2, a deburred size diameter a2 and a deburred depth d2.

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