A rotating impeller dynamic load measuring device

Abstract

The application discloses a rotating impeller dynamic load measuring device, which comprises a radial force measuring sensor and an axial force measuring sensor; the radial force measuring sensor is in a shaft sleeve type structure, is sleeved between a rotating impeller and a main shaft, and is provided with a square hole at one end for being connected with the main shaft; a key groove is formed in the side surface for realizing key connection with the impeller; a plurality of hollow stress beams are arranged in the middle of the radial force measuring sensor in the axial direction, the stress beams are uniformly distributed in the circumferential direction, and a strain gauge is attached to each stress beam; the axial force measuring sensor is in a circular ring type structure, is sleeved on the main shaft, and is pressed against the end surface of the radial force measuring sensor through an impeller nut; a plurality of contact bosses which are uniformly distributed in the circumferential direction are arranged on the two end surfaces of the axial force measuring sensor in the axial direction, and the contact bosses on the two end surfaces are arranged in a staggered mode; and a strain gauge is attached between adjacent contact bosses. The sensor is arranged at the root of the impeller, so that the measuring error can be reduced and the measuring accuracy can be improved.

Description

Technical Field

[0001] This invention relates to the field of dynamic load measurement of rotating impellers, and particularly to a device for measuring dynamic load of rotating impellers. Background Technology

[0002] Vibration of fluid machinery such as fans and pumps is induced by a variety of factors. Among these excitation sources, the most significant is the self-rotating impeller caused by fluid excitation. This excitation source is also the most difficult to measure, predict, and mitigate. Because the impeller operates in a complex fluid environment, the rotor blades interact with the complex internal processes and components during high-speed rotation, causing the impeller to bear complex dynamic loads, which in turn induces vibration. In severe cases, this can lead to damage to bearings and seals, or even production accidents.

[0003] Currently, due to the lack of necessary means to measure the dynamic load of rotating impellers, the evaluation and calculation of such loads are usually based on empirical formulas or finite element numerical simulations. However, since the rotating impeller and shaft system are subject to interference and influence from many other factors in actual work, the results of simulation and theoretical calculations have large errors. As a result, the measurement and evaluation technology of impeller dynamic load has become a bottleneck in the research and development of low-excitation, low-vibration rotating fluid machinery. Summary of the Invention

[0004] To address the problems of inaccurate calculation, large errors, and lack of necessary means for measuring the dynamic load of rotating impellers in existing methods, this invention proposes a dynamic load measuring device for rotating impellers, which can quickly and accurately measure the dynamic load of rotating impellers.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A dynamic load measuring device for a rotating impeller, the measuring device comprising a radial force measuring sensor and an axial force measuring sensor;

[0007] The radial force measuring sensor is a bushing structure, which is sleeved between the rotating impeller and the main shaft. One end of the sensor has a square hole for connecting to the main shaft. The side has a keyway for connecting to the impeller. The radial force measuring sensor has several hollowed-out force beams in the middle along the axial direction. The force beams are evenly distributed in the circumferential direction, and strain gauges are attached to each force beam.

[0008] The axial force measuring sensor has a ring-shaped structure and is sleeved on the main shaft. It is pressed against the end face of the radial force measuring sensor by an impeller nut. The axial force measuring sensor has several contact bosses evenly distributed circumferentially on both end faces along the axial direction, and the contact bosses on the two end faces are staggered. Strain gauges are attached between adjacent contact bosses.

[0009] Furthermore, the part of the main shaft that mates with the rotating impeller includes a cylindrical shaft section, a square shaft section, and a threaded section. The radial force measuring sensor is sleeved on the cylindrical shaft section and the square shaft section. The square shaft section is connected to the square hole on the end face of the radial force measuring sensor to realize torque transmission. The threaded section is connected to the impeller nut, thereby pressing the axial force measuring sensor and the radial force measuring sensor onto the shoulder of the main shaft.

[0010] Furthermore, a retaining ring groove is provided on the side of the radial force measuring sensor away from the axial force measuring sensor, and the axial limit of the rotating impeller is achieved by placing the retaining ring in the retaining ring groove.

[0011] Furthermore, the radial force measuring sensor has four load-bearing beams, and strain gauges are attached to each load-bearing beam; the axial force measuring sensor has four contact bosses on both end faces, with adjacent contact bosses on the same end face spaced 45° apart, and the contact bosses on the two end faces are arranged alternately. Two strain gauges are arranged on one end face, and the two strain gauges are respectively located at the center of the arc between two contact bosses 180° apart in the circumferential direction, corresponding to the position of the contact bosses on the other end face.

[0012] Furthermore, the radial force measuring sensor has two keyways on its side, which are arranged symmetrically.

[0013] The beneficial effects of this invention are as follows:

[0014] (1) Compared with the existing method for measuring dynamic load at the end of the main shaft, the rotating impeller dynamic load measuring device of the present invention sets the sensor at the root of the impeller, so that the sensor is as close to the impeller as possible, which can greatly reduce the error in the data measurement process and improve the measurement response speed and measurement accuracy.

[0015] (2) Based on the principle of strain measurement, this invention adopts a split design, which can simultaneously collect the axial and radial loads of the impeller, and can quickly and accurately complete the measurement of the dynamic load of the rotating impeller, capture the unsteady characteristics of the dynamic load of the rotating impeller, and solve the problems of inaccurate calculation of the dynamic load of the rotating impeller, large error and lack of necessary means of measuring the dynamic load of the rotating impeller in the prior art. Attached Figure Description

[0016] Figure 1 This is a rendering of a dynamic load measuring device for a rotating impeller provided in an embodiment of the present invention.

[0017] Figure 2 This is an assembly cross-sectional view of a rotating impeller dynamic load measuring device provided in an embodiment of the present invention.

[0018] Figure 3This is a diagram of a radial force measuring sensor component in a dynamic load measuring device for a rotating impeller provided in an embodiment of the present invention.

[0019] Figure 4 This is a component diagram of the axial force measuring sensor in a rotating impeller dynamic load measuring device provided in an embodiment of the present invention.

[0020] In the diagram, 100 is the impeller nut; 200 is the radial force sensor; 201 is the square hole; 202 is the load-bearing beam; 203 is the radial force strain gauge; 204 is the keyway; 205 is the circlip groove; 300 is the axial force sensor; 301 is the contact boss; 302 is the axial force strain gauge; 400 is the flat key; 500 is the rotating impeller; 600 is the main shaft; and 700 is the circlip. Detailed Implementation

[0021] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0022] like Figure 1 As shown, the rotating impeller dynamic load measuring device of the present invention includes a radial force measuring sensor 200 and an axial force measuring sensor 300. Figure 2 As shown, both the radial force measuring sensor 200 and the axial force measuring sensor 300 are disposed between the rotating impeller 500 and the main shaft 600.

[0023] like Figure 3 As shown, the radial force measuring sensor 200 has a bushing structure and is sleeved on the main shaft 600. One end of the radial force measuring sensor 200 has a square hole 201, and four parallel, hollowed-out force-bearing beams 202 are arranged in the middle. The force-bearing beams are evenly distributed circumferentially, and each force-bearing beam 202 is equipped with an axial force strain gauge 302. Two symmetrical keyways 204 are formed on the side of the radial force measuring sensor 200, and a retaining ring groove 205 is formed at the end.

[0024] The portion of the main shaft 600 that mates with the rotating impeller 500 includes a cylindrical shaft section, a square shaft section, and a threaded section. The radial force measuring sensor 200 is fitted onto the cylindrical shaft section and the square shaft section of the main shaft 600. The torque transmission between the main shaft 600 and the radial force measuring sensor 200 is achieved through the mating of the square shaft section and the square hole. A keyed connection between the rotating impeller 500 and the radial force measuring sensor 200 is achieved through two symmetrical keyways 204. The axial positioning of the rotating impeller 500 is achieved by placing a retaining ring 700 in a retaining ring groove 205. Gaps are provided between the radial force measuring sensor 200 and the main shaft 600, as well as between the radial force measuring sensor 200 and the shaft shoulder.

[0025] like Figure 4As shown, the axial force measuring sensor 300 has a ring-shaped structure and is also sleeved on the main shaft. It is pressed against the end face of the radial force measuring sensor 200 by the threaded section of the main shaft 600 via the impeller nut 100. The axial force measuring sensor 300 has two end faces, each with four circumferentially evenly distributed contact bosses. Adjacent contact bosses on the same end face are spaced 45° apart, and the contact bosses on the two end faces are staggered by 45 degrees. Strain gauges are attached between the contact bosses. To form a Wheatstone bridge, two strain gauges are arranged on one end face, with each strain gauge located at the center of an arc between two contact bosses 180° apart circumferentially, corresponding to the position of the contact bosses on the other end face.

[0026] The rotating impeller dynamic load measuring device of the present invention places the sensor at the root of the impeller and adopts a split design. Based on the strain measurement principle, it can simultaneously and dynamically acquire the axial and radial loads of the impeller, and can significantly reduce the error in the data measurement process, improve the measurement response speed and measurement accuracy, and quickly and accurately complete the measurement of the dynamic load of the rotating impeller, capture the unsteady characteristics of the dynamic load of the rotating impeller, and solve the problems of inaccurate calculation of the dynamic load of the rotating impeller, large error, and lack of necessary means of measuring the dynamic load of the rotating impeller in the prior art.

[0027] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A dynamic load measuring device for a rotating impeller, characterized in that, The measuring device includes a radial force measuring sensor and an axial force measuring sensor; The radial force measuring sensor is a bushing structure, which is sleeved between the rotating impeller and the main shaft. One end of the sensor has a square hole for connecting to the main shaft. The side has a keyway for connecting to the impeller. The radial force measuring sensor has several hollowed-out force beams in the middle along the axial direction. The force beams are evenly distributed in the circumferential direction, and strain gauges are attached to each force beam. The axial force measuring sensor has a ring-shaped structure and is sleeved on the main shaft. It is pressed against the end face of the radial force measuring sensor by an impeller nut. The axial force measuring sensor has several contact bosses evenly distributed in the circumferential direction on both end faces along the axial direction, and the contact bosses on the two end faces are staggered. Strain gauges are attached between adjacent contact bosses. The portion of the main shaft that mates with the rotating impeller includes a cylindrical shaft section, a square shaft section, and a threaded section. The radial force measuring sensor is sleeved on the cylindrical shaft section and the square shaft section. The square shaft section is connected to the square hole on the end face of the radial force measuring sensor to achieve torque transmission. The threaded section is connected to the impeller nut to press the axial force measuring sensor and the radial force measuring sensor onto the shaft shoulder of the main shaft. The radial force measuring sensor has a retaining ring groove on the side of the end away from the axial force measuring sensor. The axial limit of the rotating impeller is achieved by placing the retaining ring in the retaining ring groove.

2. The rotating impeller dynamic load measuring device according to claim 1, characterized in that, The radial force measuring sensor has four load-bearing beams, and strain gauges are attached to each load-bearing beam. The axial force measuring sensor has four contact bosses on both end faces. Adjacent contact bosses on the same end face are spaced 45° apart, and the contact bosses on the two end faces are staggered. Two strain gauges are placed on one end face, and the two strain gauges are located at the center of the arc between two contact bosses that are 180° apart in the circumferential direction, corresponding to the position of the contact bosses on the other end face.

3. The rotating impeller dynamic load measuring device according to claim 1, characterized in that, The radial force measuring sensor has two keyways on its side, which are arranged symmetrically.

Images