Vortex reducer, vortex reducing tube and method for setting vortex reducing tube

Abstract

A vortex reducer, a vortex reducer and a method for setting a vortex reducer are provided, wherein the vortex reducer comprises a base section and an extension section. The base section comprises a base section first end and a base section second end, wherein the base section first end is used to be installed on a support ring of the vortex reducer; and the extension section comprises an extension section first end and an extension section second end, wherein the base section second end and the extension section first end can be threadedly connected to prevent loosening, and the extension section second end is thereby set as the free end of the vortex reducer. The vibration resistance of the vortex reducer is improved.

Description

Technical Field

[0001] The invention relates to a vortex reducer and a vortex reducing pipe on an air induction path in a high-pressure rotor of a gas turbine or an aeroengine, and a method for arranging the vortex reducing pipe. Background Art

[0002] In order to reduce the operating temperature of parts such as turbine rotor blades and ensure the safety of the engine, it is necessary to introduce cooling gas from the high-pressure compressor to cool parts such as turbine rotor blades. In order to guide the airflow and reduce the loss of bleed air flow, a vortex reducer is usually installed on the high-pressure compressor to improve the bleed air effect.

[0003] In order to shorten the air induction distance, the vortex reducer is generally a slender tubular structure with one end fixed. When working, it is affected by the excitation of the engine rotor and the airflow excitation of the rotating disc cavity. In some working conditions of the engine, vibration problems are prone to occur, which in turn damages the vortex reducer. In order to alleviate the vibration problem of the vortex reducer, the traditional design uses a damping tube to reduce the vibration risk, but the damping tube design is relatively complex, and the slender and thin-walled damping tube is difficult to process, has low precision, poor inner wall surface roughness, and high processing cost. The inner wall surface of the damping tube is the flow channel for cooling the air induction, and poor surface roughness will lead to reduced air induction efficiency. Similarly, the vortex reducer is also a slender tubular structure, and the same problems as the damping tube exist in processing. Summary of the invention

[0004] The object of the present invention is to provide a vortex reducing tube, the vibration resistance of which is improved.

[0005] Another object of the present invention is to provide a vortex reducer that eliminates the damping tube and is easy to process.

[0006] The vortex reducer for achieving the above purpose comprises a base section and an extension section, wherein the base section comprises a base section first end and a base section second end, wherein the base section first end is used to be mounted on a support ring of a vortex reducer; and the extension section comprises an extension section first end and an extension section second end, wherein the base section second end and the extension section first end can be threadedly connected to prevent loosening, and the extension section second end is thereby configured as a free end of the vortex reducer.

[0007] In one embodiment, the base section is a tubular structure with a constant diameter.

[0008] In one embodiment, a portion of the extension segment including the first end of the extension segment is a tubular structure of equal diameter, while another portion including the second end of the extension segment is a tubular structure of non-equal diameter, and the second end of the extension segment has the largest diameter in the another portion.

[0009] In one embodiment, the non-uniform diameter tubular structure is in a conical frustum or step shape.

[0010] In one embodiment, the anti-loosening threaded connection between the base section and the extension section is a detachable connection.

[0011] To achieve the above purpose, a vortex reducer includes a support ring and a plurality of vortex reducer tubes. The support ring is provided with a plurality of mounting holes along the circumferential direction. The plurality of vortex reducer tubes are respectively installed in the plurality of mounting holes. The vortex reducer tubes can adopt any of the above-mentioned vortex reducer tubes.

[0012] A method for setting a vortex reducing tube is also provided. Different from a conventional vortex reducing tube, the vortex reducing tube is formed by processing into sections, and then the sections are threadedly connected in a manner that prevents loosening.

[0013] In one embodiment, the mating threads between the segments are used to generate relative friction, thereby absorbing energy and reducing vibration, thereby replacing the damping tube.

[0014] In one embodiment, during the design stage of the vortex reducer, the mass of the segment where the end of the vortex reducer is located is adjusted based on the calculation results of the excitation frequency and the natural frequency of the vortex reducer, thereby changing the natural frequency of the bending vibration mode of the vortex reducer, so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible.

[0015] In one embodiment, the segments are machined directly from bar stock or forgings.

[0016] The relative friction between the mating surfaces of the threaded connection plays a role in absorbing energy and reducing vibration, thereby improving the vibration resistance of the vortex reducer. At the same time, by changing the size of the section where the free end is located and the mass of the vortex reducer, the natural frequency of the bending vibration mode of the vortex reducer is effectively changed, so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible, further improving the vibration resistance and extending the service life. In addition, the relative length of each section of the vortex reducer is relatively short, which is convenient for processing, improves processability, reduces the surface roughness of the inner wall of the vortex reducer, and improves the air induction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 is a schematic diagram of a vortex reducer.

[0019] Figure 2 It is a schematic diagram of a vortex reducing tube.

[0020] Figure 3 It is an exploded view of the vortex reducer.

[0021] Figure 4 is a schematic diagram of a support ring. DETAILED DESCRIPTION

[0022] The following discloses a variety of different implementation methods or embodiments of the subject technical solution. To simplify the disclosure, specific examples of each element and arrangement are described below. Of course, these are only examples and are not intended to limit the scope of protection of the present invention. For example, the first feature subsequently recorded in the specification is formed above or on the second feature, which may include an implementation method in which the first and second features are formed by direct connection, and may also include an implementation method in which an additional feature is formed between the first and second features, so that the first and second features may not be directly connected. In addition, the figure marks and / or letters may be repeated in different examples in these disclosures. This repetition is for simplicity and clarity, and does not itself represent the relationship between the various implementation methods and / or structures to be discussed. Further, when the first element is described in a manner connected or combined with the second element, the description includes an implementation method in which the first and second elements are directly connected or combined with each other, and also includes the use of one or more other intervening elements to indirectly connect or combine the first and second elements.

[0023] like Figure 1 As shown, the vortex reducer includes a support ring 1 and a vortex reducer tube 2. Figure 3 As shown, the support ring 1 comprises a plurality of mounting holes 3 distributed in the circumferential direction. A plurality of vortex reducing tubes 2 are mounted through the plurality of mounting holes 3 .

[0024] like Figure 2 As shown, the vortex reducing tube 2 includes a vortex reducing tube base section 202 and a vortex reducing tube extension section 201. The vortex reducing tube base section 202 is a tubular structure with a constant diameter, and the vortex reducing tube extension section 201 is designed as a structure in which a constant diameter tube transitions to a conical truncated cone tube 301. A positioning boss 204 is provided at one end of the vortex reducing tube base section 202, and an internal thread 206 is provided at the other end. An external thread 205 is provided at one end of the vortex reducing tube extension section 201, and the other end is a free end, which is configured to form a conical truncated cone tube 301.

[0025] The vortex reducing tube base section 202 and the vortex reducing tube extension section 201 can be threadedly connected in a way that prevents loosening, that is, the lower end of the vortex reducing tube extension section 201 is built into the upper end of the vortex reducing tube base section 202, and the internal thread 206 and the external thread 205 can be threadedly connected in a way that prevents loosening. One implementation of the anti-loosening measure is to close the internal thread 206 or the external thread 205, and the anti-loosening principle adopts the anti-loosening principle of a self-locking nut.

[0026] The positioning boss 204 arranged at the lower end of the vortex reducer base section 202 is used to connect with the support ring 1. The vortex reducer base section 202 passes through the mounting hole 3. The positioning boss 204 is blocked by the inner ring surface of the support ring 1 and is positioned at the inner end side of the mounting hole 3.

[0027] During the operation of the engine, if the vortex reducer has a bending vibration type or an expansion and contraction vibration type along the tube diameter direction, the mating surfaces of the vortex reducer base section and the vortex reducer extension section will produce relative friction, which plays a role in energy absorption and vibration reduction. In the design stage, the length of the thread pair can be determined according to the vibration calculation results to achieve the best vibration reduction effect. In one embodiment, this structure replaces the damping tube in the traditional design and can also improve the vibration resistance of the vortex reducer.

[0028] exist Figure 2 and Figure 3 In the invention, the base section of the vortex reducer is an equal-diameter tubular structure; the extended section of the vortex reducer is designed as a partially equal-diameter tube and partially non-equal-diameter tubular structure, and the non-equal-diameter tubular structure includes but is not limited to a conical truncated cone or a step form. When the vortex reducer vibrates in the first-order bending vibration mode, the vibration displacement of the upper end of the vortex reducer is greater. By adjusting the size of the non-equal-diameter structural part of the extended section of the vortex reducer and changing its mass, the radial stiffness of the upper end of the vortex reducer can be improved, thereby increasing the natural frequency of the expansion and contraction vibration mode of the vortex reducer along the tube diameter direction and reducing the risk of resonance. In the design stage of the vortex reducer, according to the calculation results of the excitation frequency and the natural frequency of the vortex reducer, by changing the mass of the extended section of the vortex reducer, the natural frequency of the bending vibration mode of the vortex reducer is effectively changed, so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible, further improving the vibration resistance and extending the service life.

[0029] like Figure 2 and Figure 3 As shown, the vortex reducer is a two-section tubular structure of a vortex reducer base section and a vortex reducer extension section. The relative length of each section is relatively short, and can be directly machined using bars or forgings. It has good processability, achieves higher processing accuracy, reduces the surface roughness of the inner wall of the vortex reducer, and improves the air induction efficiency. At the same time, the two-section vortex reducer structure is easy to disassemble, maintain and repair.

[0030] pass Figures 1 to 3 As well as the description of the aforementioned embodiment, it can also be understood that a method for setting up a vortex reducer is firstly to process and shape the vortex reducer in sections, for example, directly machining the vortex reducer using rods or forgings, and the number of sections of the vortex reducer is determined according to the total length of the vortex reducer and the vibration calculation results. Then, each section is threadedly connected in a way that prevents loosening. In addition to the anti-loosening principle of the self-locking nut, the anti-loosening connection of the thread can also be other anti-loosening principles, such as mechanical anti-loosening, using a stopper to directly limit the relative rotation of the thread pair, such as using a cotter pin, a series of steel wires and a stop washer.

[0031] An optional method is to utilize the matching threads between the sections to generate relative friction, thereby absorbing energy and reducing vibration, thereby replacing the damping tube, that is, eliminating the damping tube in the vortex reducing tube.

[0032] The flexibility of the setting method further brought about by the segmented structure is reflected in that, during the design stage of the vortex reducer, the mass of the segment where the end of the vortex reducer is located is adjusted according to the calculation results of the excitation frequency and the natural frequency of the vortex reducer, thereby changing the natural frequency of the bending vibration mode of the vortex reducer, so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible.

[0033] The segmented structure can also make the arrangement of the vortex reducing tube simpler, for example, each segment can be directly machined using rods or forgings.

[0034] The vortex reducer in the aforementioned embodiment absorbs energy and reduces vibrations through relative friction between the mating surfaces of the threaded connection. The vibration resistance of the vortex reducer can be improved without using the damping tube in the traditional design, providing a new design idea for vibration reduction of the vortex reducer. At the same time, by changing the size of the section where the free end is located and the mass of the vortex reducer is changed, the natural frequency of the bending vibration mode of the vortex reducer is effectively changed, so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible, further improving the vibration resistance and extending the service life. In addition, the relative length of each section of the vortex reducer is relatively short, which is convenient for processing, improves the processability, reduces the surface roughness of the inner wall of the vortex reducer, and improves the air induction efficiency. At the same time, in some embodiments, the segmented vortex reducer structure is convenient for disassembly, maintenance and repair.

[0035] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A vortex reducing tube, characterized in that: include: A base section having a base section first end and a base section second end, wherein the base section first end is used for mounting on a support ring of the vortex reducer; and An extension section having an extension section first end and an extension section second end; The second end of the base section and the first end of the extension section can be threadedly connected in a non-loose manner, and the second end of the extension section is thereby configured as the free end of the vortex reducing tube.

2. The vortex reducing tube according to claim 1, characterized in that: The base section is a tubular structure with a constant diameter.

3. The vortex reducing tube according to claim 1, characterized in that: A portion of the extension segment including the first end of the extension segment is a tubular structure of equal diameter, while another portion including the second end of the extension segment is a tubular structure of non-equal diameter, and the second end of the extension segment has the largest diameter in the another portion.

4. The vortex reducing tube according to claim 3, characterized in that: The non-uniform diameter tubular structure is in a conical frustum shape or a step shape.

5. The vortex reducing tube according to claim 1, characterized in that: The anti-loosening threaded connection between the base section and the extension section is a detachable connection.

6. A vortex reducer, comprising a support ring and a plurality of vortex reducer tubes, wherein the support ring is provided with a plurality of mounting holes along the circumferential direction, and the plurality of vortex reducer tubes are respectively mounted in the plurality of mounting holes, characterized in that: The vortex reducing tube adopts the vortex reducing tube as claimed in any one of claims 1 to 5.

7. A method for setting a vortex reducing tube, characterized in that: Processing and forming the vortex reducing tube in sections; The individual segments are screwed together in a non-loose manner.

8. The method according to claim 7, characterized in that The relative friction generated by the matching threads between the sections plays a role in absorbing energy and reducing vibration, thereby replacing the damping tube.

9. The method according to claim 7, characterized in that During the design stage of the vortex reducer, the mass of the section where the end of the vortex reducer is located is adjusted based on the calculation results of the excitation frequency and the natural frequency of the vortex reducer, thereby changing the natural frequency of the bending vibration mode of the vortex reducer so that the natural frequency of the vortex reducer is as far away from the excitation frequency as possible.

10. The method according to claim 7, characterized in that The individual segments are machined directly from bars or forgings.

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