Dimension chain calculation method for determining mounting thickness of adjusting shim

Abstract

The invention provides a dimension chain calculation method for determining the installation thickness of an adjusting shim, and the method comprises the following steps: S1, installing a rotor rotating speed sensor in an intermediate case, and enabling the rotor rotating speed sensor and a speed measurement phonic wheel to form an assembly gap; s2, designing an assembly gap between the head of the rotor speed sensor and the speed measurement phonic wheel; s3, calculating the maximum compression amount of a spring in the rotor rotating speed sensor; s4, calculating an installation compression length value of the rotor rotating speed sensor according to a difference value between the length of the rotor rotating speed sensor and the internal and external installation lengths of the rotor rotating speed sensor; and S5, according to the limit values of the maximum compression amount and the minimum compression amount of the rotor rotating speed sensor, a plurality of gaskets are selected to be installed at the outer installation positions of the rotor rotating speed sensor. The required thickness of the adjusting shim can be quickly determined through a size calculation method, the assembly clearance between the rotating speed sensor and the speed measurement phonic wheel is ensured, and the measurement precision of the rotating speed sensor is improved.

Description

Technical Field

[0001] The invention relates to the field of aeroengines, and in particular to a dimension chain calculation method for determining the installation thickness of an adjustment gasket. Background Art

[0002] In the existing technology, large bypass ratio gas turbine engines have advantages such as low fuel consumption, and their larger size can provide greater thrust for the aircraft. However, their larger size and structure also make assembly difficult. After dimensional chain calculation, the problem of the structure failing to meet the tolerance design requirements has emerged.

[0003] Figure 1 This is a schematic diagram of the speed sensor installation structure. Figure 1 As shown in the figure, the rotor speed sensor is taken as an example. Since the speed sensor has a fixed measurement range, the larger the test distance, the weaker the sensor signal. Conversely, the stronger it is. During the assembly process of the engine, the assembly gap between the speed sensor and the speed measuring wheel needs to be controlled. However, the accumulation of machining errors of the speed sensor and its related mounting structure often results in the final assembly gap failing to meet the measurement requirements.

[0004] In order to ensure the feasibility of assembly and the accuracy of measurement results, the structure should be adjusted so that the assembly clearance requirements are within the design range.

[0005] Under the large-size structural tolerance of the engine, the assembly clearance between the speed sensor and the speed measuring wheel cannot meet the design requirements, and the measurement data is inaccurate.

[0006] In order to solve the above problems, the present application designs a dimensional chain calculation method for determining the installation thickness of the adjustment gasket to ensure that the speed sensor is installed in place in one step. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art such as the assembly clearance between the speed sensor and the speed measuring sound wheel cannot meet the design requirements and the measurement data is inaccurate, and to provide a dimensional chain calculation method for determining the installation thickness of the adjustment gasket.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] The present invention provides a dimension chain calculation method for determining the installation thickness of an adjustment gasket, which is characterized in that the dimension chain calculation method comprises the following steps:

[0010] S1, installing the rotor speed sensor into the intermediate casing so that an assembly gap is formed between the rotor speed sensor and the speed measuring sound wheel;

[0011] S2, designing the assembly gap between the head of the rotor speed sensor and the speed measuring sound wheel;

[0012] S3, calculating the maximum compression amount of the spring in the rotor speed sensor;

[0013] S4, calculating the installation compression length value of the rotor speed sensor according to the difference between the rotor speed sensor's own length and the inner and outer installation lengths of the rotor speed sensor;

[0014] S5. According to the limit values ​​of the maximum compression amount and the minimum compression amount of the rotor speed sensor, select a plurality of gaskets and install them at the outer installation position of the rotor speed sensor to adjust the installation length of the rotor speed sensor.

[0015] According to an embodiment of the present invention, the step S1 includes: the rotor speed sensor is obliquely inserted into the intermediate casing and fixedly installed via a sleeve and a mounting interface.

[0016] According to an embodiment of the present invention, the mounting interface is arranged outside the intermediate casing.

[0017] According to one embodiment of the present invention, the rotor speed sensor is obliquely inserted into the intermediate casing at an angle of 45°.

[0018] According to an embodiment of the present invention, step S2 includes: setting all dimensions and geometric nominal values ​​in the processing to H i and L i The upper and lower limit deviations are H i_ES , H i_EI and L i_ES ,

[0019] L i_EI , assembly clearance upper deviation, assembly clearance lower deviation requirements Δ max and Δ min , the radial height of the center position of the speed sensor head and the sleeve fixed fit:

[0020]

[0021] Among them, H2 is the radial height of the speed sensor head, ΔH is the assembly clearance requirement between the speed sensor and the speed measuring wheel, H1 is the radial height of the test wheel, H3 is the radial height of the center position of the speed sensor head and the sleeve fixed fit, L1 is the sensor slot length, and θ is the angle between the sensor and the engine centerline.

[0022] According to one embodiment of the present invention, the calculation formula in step S3 is:

[0023] ΔL=m×10g÷k

[0024] Among them, ΔL is the compression of the spring, m is the mass of the spring, and k is the elastic coefficient.

[0025] According to one embodiment of the present invention, the calculation formula in step S4 is:

[0026]

[0027] Among them, H4 is the radial height of the speed sensor installed outside, H5 is the radial height difference of the speed sensor installed inside and outside, L2 is the installation length of the speed sensor inside and outside, L3 is the length of the speed sensor, ΔL′ max is the theoretical maximum compression length of the speed sensor, ΔL′ min It is the theoretical minimum compression length of the speed sensor.

[0028] According to an embodiment of the present invention, the gasket in step S5 is a grindable gasket.

[0029] The positive and progressive effects of the present invention are:

[0030] The present invention determines the dimensional chain calculation method for adjusting the installation thickness of the gasket, comprehensively analyzes the influencing factors of the speed sensor manufacturing error, installation compression, and installation angle, determines the thickness of the adjusting gasket based on the dimensional chain calculation analysis, and ensures that the speed sensor is installed in place in one step.

[0031] The dimension chain calculation method can quickly determine the required adjustment gasket thickness through a dimension calculation method, ensure the assembly gap between the speed sensor and the speed measuring sound wheel, and improve the measurement accuracy of the speed sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0033] Figure 1 This is a schematic diagram of the speed sensor installation structure.

[0034] [Reference Signs]

[0035] Rotor speed sensor 10

[0036] Intermediate Casing 20

[0037] Speed ​​measuring wheel 30

[0038] Sleeve 40 DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0041] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0042] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0043] The present invention discloses a method for calculating a dimension chain for determining the installation thickness of an adjustment gasket, which comprises the following steps:

[0044] Step S1, install the rotor speed sensor 10 into the intermediate casing 20, so that the rotor speed sensor 10 forms an assembly gap with the speed measuring sound wheel 30. The rotor speed sensor 10 forms a rotor speed signal by identifying the high and low teeth on the speed measuring sound wheel 30.

[0045] like Figure 1 As shown, preferably, the step S1 includes: the rotor speed sensor 10 is obliquely inserted into the intermediate casing 20 , and fixedly installed through the sleeve 40 and the installation interface. The installation interface is arranged outside the intermediate casing 20 .

[0046] For example, the angle at which the rotor speed sensor 10 is obliquely inserted into the intermediate casing 20 is preferably 45°, 30°, or 60°.

[0047] Step S2 , designing the assembly gap between the head of the rotor speed sensor 10 and the speed measuring sound wheel 30 .

[0048] Preferably, the step S2 includes: setting all dimensions and geometric nominal values ​​in the processing to H i and L i The upper and lower limit deviations are H i_ES , H i_EI and L i_ES , L i_EI , assembly clearance upper deviation, assembly clearance lower deviation requirements Δ max and Δ min , the radial height of the center position of the speed sensor head and the sleeve fixed fit:

[0049]

[0050] Among them, H2 is the radial height of the speed sensor head, ΔH is the assembly clearance requirement between the speed sensor and the speed measuring wheel, H1 is the radial height of the test wheel, H3 is the radial height of the center position of the speed sensor head and the sleeve fixed fit, L1 is the sensor slot length, and θ is the angle between the sensor and the engine centerline.

[0051] Step S3, calculating the maximum compression amount of the spring in the rotor speed sensor.

[0052] A spring is arranged inside the rotor speed sensor 10 . The spring has a maximum compression limit value and will not shake due to vibration during the operation of the engine.

[0053] The spring needs to maintain a minimum compression, considering the vibration overload factor of 10g:

[0054] ΔL=m×10g÷k

[0055] Among them, ΔL is the compression of the spring, m is the mass of the spring, and k is the elastic coefficient.

[0056] Step S4: Calculate the installation compression length value of the rotor speed sensor according to the difference between the rotor speed sensor's own length and the inner and outer installation lengths of the rotor speed sensor.

[0057] Preferably, the calculation formula in step S4 is:

[0058]

[0059] Among them, H4 is the radial height of the speed sensor installed outside, H5 is the radial height difference of the speed sensor installed inside and outside, L2 is the installation length of the speed sensor inside and outside, L3 is the length of the speed sensor, ΔL′ max is the theoretical maximum compression length of the speed sensor, ΔL′ min It is the theoretical minimum compression length of the speed sensor.

[0060] Step S5: According to the limit values ​​of the maximum compression amount and the minimum compression amount of the rotor speed sensor, select a number of gaskets to be installed at the outer installation position of the rotor speed sensor to adjust the installation length of the rotor speed sensor. In this way, it can be ensured that the assembly gap between the speed sensor and the speed measuring sound wheel meets the use requirements. Preferably, the gaskets here can be grindable gaskets.

[0061] In summary, the dimension chain calculation method for determining the installation thickness of the adjustment gasket of the present invention comprehensively analyzes the influencing factors of the speed sensor manufacturing error, installation compression, and installation angle, and determines the thickness of the adjustment gasket based on the dimension chain calculation and analysis to ensure that the speed sensor is installed in place in one step.

[0062] The dimension chain calculation method can quickly determine the required adjustment gasket thickness through a dimension calculation method, ensure the assembly gap between the speed sensor and the speed measuring sound wheel, and improve the measurement accuracy of the speed sensor.

[0063] For those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary implementation of the present application.

[0064] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0065] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for calculating a dimension chain for determining the installation thickness of an adjusting gasket, characterized in that: The dimension chain calculation method comprises the following steps: S1, installing the rotor speed sensor into the intermediate casing so that an assembly gap is formed between the rotor speed sensor and the speed measuring sound wheel; S2, designing the assembly gap between the head of the rotor speed sensor and the speed measuring sound wheel; S3, calculating the maximum compression amount of the spring in the rotor speed sensor; S4, calculating the installation compression length value of the rotor speed sensor according to the difference between the rotor speed sensor's own length and the inner and outer installation lengths of the rotor speed sensor; S5. According to the limit values ​​of the maximum compression amount and the minimum compression amount of the rotor speed sensor, select a plurality of gaskets and install them at the outer installation position of the rotor speed sensor to adjust the installation length of the rotor speed sensor.

2. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 1, characterized in that: The step S1 includes: the rotor speed sensor is obliquely inserted into the intermediate casing and fixedly installed via a sleeve and a mounting interface.

3. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 2, characterized in that: The installation interface is arranged outside the intermediate casing.

4. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 2, characterized in that: The rotor speed sensor is obliquely inserted into the intermediate casing at an angle of 45°, 30° or 60°.

5. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 1, characterized in that: The step S2 includes: setting all dimensions and geometric nominal values ​​in the processing to H i and L i The upper and lower limit deviations are H i_Es , H i_EI and L i_ES , L i_EI , assembly clearance upper deviation, assembly clearance lower deviation requirements Δ max and Δ min , the radial height of the center position of the speed sensor head and the sleeve fixed fit: Among them, H2 is the radial height of the speed sensor head, ΔH is the assembly clearance requirement between the speed sensor and the speed measuring wheel, H1 is the radial height of the test wheel, H3 is the radial height of the center position of the speed sensor head and the sleeve fixed fit, L1 is the sensor slot length, and θ is the angle between the sensor and the engine centerline.

6. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 1, characterized in that: The calculation formula in step S3 is: AL=m×10g÷k Among them, ΔL is the compression of the spring, m is the mass of the spring, and k is the elastic coefficient.

7. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 1, characterized in that: The calculation formula in step S4 is: Among them, H4 is the radial height of the speed sensor installed outside, H5 is the radial height difference of the speed sensor installed inside and outside, L2 is the installation length of the speed sensor inside and outside, L3 is the length of the speed sensor, ΔL′ max is the theoretical maximum compression length of the speed sensor, ΔL′ min It is the theoretical minimum compression length of the speed sensor.

8. The method for calculating the dimension chain for determining the installation thickness of the adjusting gasket according to claim 1, characterized in that: The gasket in step S5 is a grindable gasket.

Images