Connecting method of deformed light high-temperature alloy turbine rotating shaft

Abstract

The invention provides a connecting method for a deformed light high-temperature alloy turbine rotating shaft. The connecting method comprises the following steps that S1, a sealing ring groove is formed in the outer portion of a rotating shaft sleeve, internal threads are machined on the inner concave sleeve connecting face of the rotating shaft, and external threads are machined on the outer convex connecting face of a turbine; s2, a positioning pin hole is machined, and the positioning pin hole is located in the sealing ring groove; and S3, after the outer convex connecting surface of the turbine is in threaded connection with the inner concave sleeve connecting surface of the rotating shaft, a positioning pin is mounted. According to the connecting method of the deformed light high-temperature alloy turbine rotating shaft, the combined connecting structure form and connecting process parameters of the turbine and the rotating shaft are reasonably designed, the combined mode of threads and positioning pins is adopted, the influence of axial and radial loads on the connecting strength is reduced, and the working stability and durability of a turbocharger are improved.

Description

Technical Field

[0001] The invention belongs to the field of turbocharger structure design, and in particular relates to a method for connecting a deformed lightweight high-temperature alloy turbine shaft. Background Art

[0002] In order to improve the transient response of the exhaust gas turbocharger engine, reduce the black smoke phenomenon during starting / acceleration, and reduce the rotational inertia of the turbocharger rotor, TiAl alloy, as a new type of lightweight high-temperature alloy, has higher specific strength and elastic modulus than traditional nickel-based high-temperature alloys, and its density is less than half of that of traditional nickel-based high-temperature alloys. It is a good material support for reducing the rotational inertia of the turbine and improving the responsiveness of the engine. However, TiAl alloy is a brittle material with physical and mechanical properties between metal and ceramic materials. The traditional nickel-based high-temperature alloy welding process cannot ensure the reliable connection between the brittle material titanium aluminum alloy turbine and the structural steel shaft, and the connection strength of the turbine shaft cannot be effectively guaranteed. In view of the high-temperature and high-speed operation of the turbine rotor system, the shaft connection structure must be able to withstand complex loads, and the strength of the connection structure should meet the design and use requirements. At present, the cast lightweight high-temperature alloy turbine has problems such as coarse core structure and unstable molding quality. Considering the application requirements of diesel engines for high power and high reinforcement, it should be ensured that the turbine rotor has sufficient connection strength. Therefore, in order to ensure the long-term reliability of the supercharger turbine shaft, based on the advantages of deformed lightweight high-temperature alloys such as high degree of alloying and strong plasticity, combined with the material properties of the structural steel shaft and the forming characteristics of the deformed lightweight high-temperature alloy turbine, it is necessary to study the connection method between the deformed lightweight high-temperature alloy turbine and the structural steel shaft, so as to achieve the stability and durability of the turbine shaft components. Summary of the invention

[0003] In view of this, the present invention aims to propose a method for connecting a deformed lightweight high-temperature alloy turbine shaft to solve the problems of coarse core structure and unstable molding quality in cast lightweight high-temperature alloy turbines.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for connecting a deformed lightweight high-temperature alloy turbine shaft comprises the following steps:

[0006] S1. A sealing ring groove is arranged on the outside of the shaft sleeve, an internal thread is processed on the inner concave sleeve connection surface of the shaft, and an external thread is processed on the outer convex connection surface of the turbine;

[0007] S2. Process the positioning pin hole, and the positioning pin hole is located in the sealing ring groove;

[0008] S3. After the outer convex connection surface of the turbine is threadedly connected with the inner concave sleeve connection surface of the shaft, the positioning pin is installed.

[0009] Furthermore, the outer convex connection surface of the turbine contacts the bottom of the inner concave sleeve connection surface 4 of the shaft.

[0010] Furthermore, the outer diameter of the positioning pin hole is 1 / 3 of the width of the sealing ring groove.

[0011] Furthermore, the depth of the locating pin embedded in the turbine connecting shaft is ≥3mm.

[0012] Furthermore, the thickness H of the bottom groove of the sealing ring groove is ≥3.5 mm.

[0013] Compared with the prior art, the connection method of the deformed lightweight high-temperature alloy turbine shaft of the present invention has the following advantages:

[0014] (1) The method for connecting a deformed lightweight high-temperature alloy turbine shaft of the present invention adopts a combination of threads and locating pins by reasonably designing the combined connection structure and connection process parameters of the turbine and the shaft, thereby reducing the influence of axial and radial loads on the connection strength and improving the working stability and durability of the turbocharger.

[0015] (2) In the connection method of the deformed lightweight high-temperature alloy turbine shaft described in the present invention, the threaded portion ensures the axial strength of the connection structure, and the positioning pin ensures the radial strength of the connection, which not only ensures the tensile strength but also reduces the radial deformation caused by impact vibration, and is easy to meet the use requirements of the turbine shaft.

[0016] (3) The method for connecting the deformed lightweight high-temperature alloy turbine shaft described in the present invention has a relatively simple connection structure, and the machining and connection processes are easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a flow chart of the method for connecting a deformed lightweight high-temperature alloy turbine shaft according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the turbine shaft after connection according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1-external convex connection surface; 2-sealing ring groove; 3-positioning pin hole; 4-inner concave sleeve connection surface; 5-positioning pin. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] A method for connecting a deformed lightweight high-temperature alloy turbine shaft, such as Figure 1 and Figure 2 As shown, the following steps are included:

[0027] S1, a sealing ring groove 2 is arranged on the outside of the shaft sleeve, an internal thread is processed on the inner concave sleeve connection surface 4 of the shaft, and an external thread is arranged on the outer convex connection surface 1 of the turbine;

[0028] S2, machining the positioning pin hole 3, and the positioning pin hole 3 is located in the sealing ring groove 2;

[0029] S3. After the outer convex connection surface of the turbine is threadedly connected with the inner concave sleeve connection surface 4 of the shaft, the positioning pin 5 is installed.

[0030] The threaded part of this solution ensures the axial strength of the connection structure, and the positioning pin ensures the radial strength of the connection, which not only ensures the tensile strength but also reduces the radial deformation caused by impact vibration, and is easy to meet the use requirements of the turbine shaft.

[0031] The outer convex connection surface of the turbine contacts the bottom of the inner concave sleeve connection surface 4 of the shaft.

[0032] The outer diameter of the positioning pin hole 3 is 1 / 3 of the width of the sealing ring groove, and the depth of the positioning pin 5 embedded in the turbine connecting shaft is h, and h≥3mm.

[0033] In order to meet the structural strength of the sealing ring groove of the structural steel rotating shaft sleeve, the thickness H of the bottom groove of the sealing ring groove 2 of the rotating shaft sleeve wall is ≥3.5mm.

[0034] The specific steps of the method for connecting the deformed lightweight high-temperature alloy turbine shaft are:

[0035] 1) In order to meet the structural strength of the sealing ring groove of the structural steel shaft sleeve, the bottom groove diameter of the sealing ring groove on the shaft sleeve wall is 21mm, and the inner concave sleeve connection surface 4 of the shaft is machined with an internal thread, whose major diameter D is 14mm and the pitch P is 1mm. The external thread of the convex connection surface of the turbine is correspondingly machined to meet the bottom groove thickness H of the sealing ring groove 2 ≥ 3.5mm.

[0036] 2) The width of the sealing ring groove 2 is 3.9 mm, and a positioning pin hole 3 is drilled in its center with a hole diameter of 1 mm and a nominal length of 8 mm (the bottom groove thickness H is 3.5 mm + the turbine connecting shaft embedded depth h is 4.5 mm), ensuring the depth h ≥ 3 mm requirement.

[0037] 3) The shaft sleeve and the turbine outer convex connection surface are threadedly connected, and then the cylindrical positioning pin 5 is installed.

[0038] This scheme is based on the advantages of deformed lightweight high-temperature alloys such as high degree of alloying and strong plasticity, combined with the material properties of the structural steel shaft and the forming characteristics of the deformed lightweight high-temperature alloy turbine. By rationally designing the combined connection structure and connection process parameters of the turbine and the shaft, a combination of threads and locating pins is adopted to reduce the influence of axial and radial loads on the connection strength, thereby improving the working stability and durability of the turbocharger.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for connecting a deformed lightweight high-temperature alloy turbine shaft, characterized in that: The steps include: S1. A sealing ring groove is arranged outside the rotating shaft sleeve, an internal thread is processed on the inner concave sleeve connection surface of the rotating shaft, and an external thread is arranged on the outer convex connection surface of the turbine; S2. Process the positioning pin hole, and the positioning pin hole is located in the sealing ring groove; S3. After the outer convex connection surface of the turbine is threadedly connected with the inner concave sleeve connection surface of the shaft, the positioning pin is installed.

2. The method for connecting a deformed lightweight high-temperature alloy turbine shaft according to claim 1, characterized in that: The outer convex connection surface of the turbine contacts the bottom of the inner concave sleeve connection surface 4 of the shaft.

3. The method for connecting a deformed lightweight high-temperature alloy turbine shaft according to claim 1, characterized in that: The outer diameter of the locating pin hole is 1 / 3 of the width of the sealing ring groove.

4. The method for connecting a deformed lightweight high-temperature alloy turbine shaft according to claim 1, characterized in that: The depth of the locating pin embedded in the turbine connecting shaft is ≥3mm.

5. The method for connecting a deformed lightweight high-temperature alloy turbine shaft according to claim 1, characterized in that: The thickness of the bottom groove of the sealing ring groove is H≥3.5mm.

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