Double-positioning type dynamic balance mandrel

Abstract

The utility model discloses a double-positioning type dynamic balance mandrel which enables the unbalance amount of a compressor impeller to meet the standard requirement. Comprising a dynamic balance core shaft, the impeller connecting end of the dynamic balance core shaft is provided with a limiting disc and an external thread, the impeller connecting end of the dynamic balance core shaft is further provided with a main positioning face and an auxiliary positioning face, the diameter of the main positioning face and the diameter of the auxiliary positioning face are smaller than that of the external thread, the main positioning face is located on the inner side of the external thread, and the auxiliary positioning face is located on the outer side of the external thread. A face A, an internal thread and a face B are sequentially arranged in a connecting hole of the compressor impeller, an external thread of the dynamic balance mandrel is connected with the internal thread of the compressor impeller in a matched mode, and an auxiliary positioning face of the dynamic balance mandrel is in interference fit with the face A of the compressor impeller. And the main positioning surface of the dynamic balance mandrel is in transition fit with the surface B of the compressor impeller.

Description

Technical Field

[0001] The utility model relates to the technical field of marine turbochargers, in particular to a double-positioning dynamic balancing core shaft. Background Art

[0002] As a vital component of a ship's propulsion system, the technical level of a marine turbocharger directly impacts the efficiency of its diesel engine. The compressor impeller is one of the most critical components of a turbocharger. Driven by the main shaft, it draws in air, accelerating and compressing it. To ensure safe, quiet operation and component interchangeability, the compressor impeller undergoes high-precision dynamic balancing to correct for imbalance. After machining, the compressor impeller undergoes a dynamic balancing test using specialized tools to ensure that the impeller's imbalance meets the specified requirements and meets the part's intended use.

[0003] Currently, the dynamic balancing mandrel and the compressor impeller are connected by a threaded connection and a clearance fit between the locating surfaces. Dynamic balancing tests are performed after assembly with the compressor impeller. During the dynamic balancing test, the compressor impeller experiences a large imbalance due to the large clearance between the locating surfaces of the dynamic balancing mandrel and the compressor impeller, ultimately causing the imbalance to exceed regulatory requirements. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a double-positioning dynamic balancing core shaft so that the unbalance amount of the compressor impeller meets the specification requirements.

[0005] The purpose of this utility model is achieved in this way:

[0006] A double-positioning dynamic balancing tool comprises a dynamic balancing core shaft, an impeller connecting end of the dynamic balancing core shaft is provided with a limiting disc and an external thread, the impeller connecting end of the dynamic balancing core shaft is also provided with a main positioning surface and an auxiliary positioning surface, the diameters of the main positioning surface and the auxiliary positioning surface are smaller than the diameter of the external thread, the main positioning surface is located on the inner side of the external thread, the auxiliary positioning surface is located on the outer side of the external thread, the connecting hole of the compressor impeller is sequentially provided with an A surface, an internal thread, and a B surface, the external thread of the dynamic balancing core shaft is cooperatively connected with the internal thread of the compressor impeller, the auxiliary positioning surface of the dynamic balancing core shaft is interference fit with the A surface of the compressor impeller; the main positioning surface of the dynamic balancing core shaft is transition fit with the B surface of the compressor impeller.

[0007] Preferably, it also includes a gasket, which is annular and is sleeved on the main positioning surface of the balancing core shaft. The inner hole of the gasket is clearance-matched with the main positioning surface, and the two end faces of the gasket respectively fit the end face of the compressor impeller and the end face of the limiting disc of the dynamic balancing core shaft.

[0008] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0009] 1. The pass rate of the compressor impeller dynamic balance test has been improved to meet the regulatory requirements.

[0010] 2. Reduce the unbalance error caused by repeated clamping of the compressor impeller, improve the stability and safety of the compressor impeller during use, and ensure the interchangeability of the compressor impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 Schematic diagram of the structure of the gasket;

[0013] Figure 3 It is a structural diagram of the dynamic balancing mandrel.

[0014] Reference numerals

[0015] In the accompanying drawings, 1 is a gasket, 2 is a dynamic balancing core shaft, 3 is surface A, and 4 is surface B. DETAILED DESCRIPTION

[0016] See also Figure 1-Figure 3 A dual-positioning dynamic balancing tool includes a dynamic balancing mandrel and a gasket. The impeller-connecting end of the dynamic balancing mandrel is provided with a limiting disc and an external thread. The impeller-connecting end of the dynamic balancing mandrel is also provided with a main positioning surface and an auxiliary positioning surface. The diameters of the main positioning surface and the auxiliary positioning surface are smaller than the diameter of the external thread. The main positioning surface is located on the inner side of the external thread, and the auxiliary positioning surface is located on the outer side of the external thread. The connection hole of the compressor impeller is sequentially provided with surface A, internal thread, and surface B. The external thread of the dynamic balancing mandrel is connected to the internal thread of the compressor impeller. The auxiliary positioning surface of the dynamic balancing mandrel has an interference fit with surface A of the compressor impeller; the main positioning surface of the dynamic balancing mandrel has a transition fit with surface B of the compressor impeller. The gasket is annular and is sleeved on the main positioning surface of the balancing mandrel. The inner hole of the gasket is in a clearance fit with the main positioning surface. The two end surfaces of the gasket respectively fit the end face of the compressor impeller and the end face of the limiting disc of the dynamic balancing mandrel.

[0017] Specifically:

[0018] ① Gasket: The inner hole of the gasket and the right side positioning surface of the core shaft thread are in clearance fit, and the two end surfaces are close to the compressor impeller and the dynamic balancing core shaft. In order to prevent the end surface of the compressor impeller from being scratched and reduce the influence of the gasket on the imbalance, the roughness and form and position tolerance requirements of the two end surfaces of the gasket are improved. Figure 2 .

[0019] ② Dynamic balancing mandrel: The dynamic balancing mandrel is assembled with the compressor impeller through threads and has two positioning surfaces. The positioning surface on the left side of the thread is the auxiliary positioning surface, and the matching relationship with the compressor impeller surface A is a small interference fit; the positioning surface on the right side of the thread is the main positioning surface, and the matching relationship with the compressor impeller surface B is a transition fit, see Figure 1 、 Figure 3 At the same time, the form and position tolerance requirements of each positioning surface and supporting surface are improved to avoid the imbalance of the core shaft itself or the runout error between the core shaft and the support, which may cause the compressor impeller after dynamic balancing to produce a large imbalance during repeated clamping and use.

[0020] This double-positioning dynamic balancing mandrel needs to be used in conjunction with a dynamic balancing machine. This patent uses the HM10BK dynamic balancing machine as an example to illustrate its installation and usage methods.

[0021] 1. Obtain the corresponding dynamic balancing specifications according to the compressor impeller drawing requirements;

[0022] 2. Thoroughly clean the inner hole of the compressor impeller and the dynamic balancing core shaft to ensure that there are no impurities or particles attached;

[0023] 2. Install the dynamic balancing mandrel onto the HM10BK dynamic balancing machine, perform dynamic balancing via belt drive, and calibrate the dynamic balancing machine;

[0024] 3. Clean the end face and inner hole of the gasket, and install the gasket on the dynamic balancing mandrel with the end face close to it;

[0025] 4. Use the thread structure on the dynamic balancing mandrel to install the compressor impeller onto the dynamic balancing tool, making sure the compressor impeller is in close contact with the end face of the gasket;

[0026] 5. Install the assembly onto the HM10BK dynamic balancing machine, start the equipment, and begin dynamic balancing;

[0027] 6. According to the screen display on the HM10BK dynamic balancing machine, balance the air at the air inlet end of the compressor impeller and remove the air at the air outlet end of the compressor impeller in accordance with the specifications. Repeat the test to ensure that the unbalance amount of the compressor impeller meets the requirements.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A dual-position dynamic balancing tool, comprising a dynamic balancing mandrel, the impeller connection end of which is provided with a limiting disc and an external thread, characterized in that: The impeller connecting end of the dynamic balancing core shaft is also provided with a main positioning surface and an auxiliary positioning surface. The diameters of the main positioning surface and the auxiliary positioning surface are smaller than the diameter of the external thread. The main positioning surface is located on the inner side of the external thread, and the auxiliary positioning surface is located on the outer side of the external thread. The connecting hole of the compressor impeller is sequentially arranged with surface A, internal thread, and surface B. The external thread of the dynamic balancing core shaft is connected with the internal thread of the compressor impeller, and the auxiliary positioning surface of the dynamic balancing core shaft has an interference fit with the A surface of the compressor impeller; the main positioning surface of the dynamic balancing core shaft has a transition fit with the B surface of the compressor impeller.

2. The double-positioning dynamic balancing mandrel according to claim 1, characterized in that: It also includes a gasket, which is annular and is sleeved on the main positioning surface of the balancing core shaft. The inner hole of the gasket is clearance-matched with the main positioning surface, and the two end faces of the gasket are respectively fitted with the end face of the compressor impeller and the end face of the limiting disc of the dynamic balancing core shaft.

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