Rotor axial force measuring device, measuring system and using method

Abstract

The invention relates to the technical field of rotor axial force measurement, in particular to a rotor axial force measuring device and system and a use method. A rotor axial force measuring device comprises a measuring assembly, the measuring assembly is suitable for being arranged between a bearing and a supporting ring end, the measuring assembly comprises an elastic ring, the elastic ring is suitable for being arranged on the peripheral face of a rotor shaft in a sleeving mode, and a strain gauge is suitable for being pasted on the elastic ring; the first side face of the elastic ring is suitable for being attached to the side face of the bearing outer ring, and the second side face of the elastic ring is suitable for being attached to the side face of the supporting ring end. The invention provides a rotor axial force measuring device, a rotor axial force measuring system and a use method, and aims to solve the problems that a strain value is insensitive to an axial force and is easily interfered by other factors, and an axial load cannot be effectively obtained in a method for measuring the axial force in a manner of pasting a strain gauge on an elastic support of a rotor bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor axial force measurement, and in particular to a rotor axial force measurement device, a measurement system and a use method. Background Art

[0002] When an aircraft engine / propeller rotor is operating, it generates a forward axial load. Excessive axial loads may exceed the allowable load of the bearing, affecting the bearing strength and life. Excessive axial loads will cause the bearing to slip under light load, resulting in bearing wear and failure. Therefore, the rotor axial force is a basic parameter for rotor bearing design, and the accuracy of the axial force test is related to the strength and life of the bearing and the engine's safety and reliability indicators. For propeller engines, the development process requires accurate acquisition of the propeller thrust characteristics throughout the entire operating range, with particular attention to the low-thrust characteristics at low altitude and low speed, to ensure reliable operation of the installed platform at low altitude and low speed patrol. Existing methods for testing the axial force of engine rotors primarily involve attaching strain gauges to the elastic supports of the rotor bearings. When the rotor is operating, the axial force generates strain through the elastic supports, and the axial force is converted based on the strain measurement results.

[0003] The method of measuring axial force by attaching strain gauges to the elastic support of the rotor bearing is limited by the structural size and stiffness of the elastic support. If the structural size is too small, the strain gauge may not be effectively attached. In addition, if the axial stiffness of the elastic support is too large or the axial force of the rotor is relatively small, the strain value is insensitive to the axial force and is easily interfered by other factors, and the axial load may not be effectively obtained. Summary of the Invention

[0004] In view of this, the present invention provides a rotor axial force measuring device, a measuring system and a method of use to solve the problem that the method of measuring axial force by sticking strain gauges on the elastic support of the rotor bearing is insensitive to the strain value of the axial force, is easily interfered by other factors, and cannot effectively obtain the axial load.

[0005] In a first aspect, the present invention provides a rotor axial force measuring device, comprising:

[0006] A measuring assembly is suitable for being arranged between the bearing and the support ring end. The measuring assembly includes an elastic ring, which is suitable for being sleeved on the outer circumferential surface of the rotor shaft. A strain gauge is suitable for being adhered to the elastic ring. The first side surface of the elastic ring is suitable for fitting with the side surface of the bearing outer ring, and the second side surface of the elastic ring is suitable for fitting with the side surface of the support ring end.

[0007] By attaching a strain gauge to the elastic ring, there is no need to attach a strain gauge to the rotor bearing. The elastic ring will be directly affected by the axial force and elastically deform. The entire structure does not need to consider the size and stiffness of the elastic structure of the rotor bearing, thus avoiding the problem of the strain value being insensitive to the axial force and will not be affected by other factors, thereby effectively obtaining the value of the axial load.

[0008] In an optional embodiment, the first side surface of the elastic ring is provided with at least three first bosses, and the second side surface is provided with at least three second bosses.

[0009] In an optional embodiment, the at least three first bosses on the first side surface are arranged with equal curvature, and the at least three second bosses on the second side surface are arranged with equal curvature.

[0010] In an optional embodiment, the arc between adjacent first bosses corresponds to a first angle, the arc between adjacent second bosses corresponds to a second angle, the number of the first bosses and the second bosses is equal, and the first angle and the second angle are equal.

[0011] In an optional embodiment, the center line of the first boss and the center point of the elastic ring form a first ray, the center line of the second boss and the center point of the elastic ring form a second ray, and a third angle is formed between the first ray and the second ray, and the degree of the first angle is twice the degree of the third angle.

[0012] In an optional embodiment, the height of the first boss is the difference between the outer diameter and the inner diameter of the elastic ring, and the first boss and the second boss have the same size.

[0013] In an optional embodiment, the measuring assembly further includes a first retaining ring and a second retaining ring, the first side surface of the elastic ring is in contact with the side surface of the first retaining ring, and the second side surface of the elastic ring is in contact with the side surface of the second retaining ring.

[0014] In an optional embodiment, the thickness of the first retaining ring is equal to the thickness of the second retaining ring, and the thickness of the first retaining ring is at least three times the thickness of the ring body.

[0015] In a second aspect, the present invention further provides a measurement system comprising the above-mentioned rotor axial force measurement device.

[0016] In a third aspect, the present invention also provides a method for using a rotor axial force measuring device. The axial force of the rotor shaft is transmitted to the elastic ring through the bearing or the support ring end. The elastic ring undergoes elastic deformation under the force. The strain gauge on the elastic ring senses the deformation of the elastic ring and then obtains the numerical value of the axial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the cooperation among the measuring assembly, bearing and limit ring according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a measurement component according to an embodiment of the present invention;

[0020] Figure 3 A side view of an elastic ring according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of an elastic ring according to an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a first angle formed by a first boss according to an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a first boss and a second boss forming a third angle according to an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of a first boss according to an embodiment of the present invention;

[0025] Figure 8 Schematic diagram of the positions of the first boss and the strain gauge according to an embodiment of the present invention.

[0026] Explanation of the accompanying drawings: 1. Bearing; 2. Measuring assembly; 201. First retaining ring; 202. Elastic ring; 2021. Ring body; 2022. First boss; 2023. Second boss; 2024. First angle; 2025. Third angle; 2026. First ray; 2027. Second ray; 2028. Strain gauge; 203. Second retaining ring; 3. Limiting ring; 301. Limiting end; 302. Support ring end. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0029] According to an embodiment of the present invention, on the one hand, a rotor axial force measuring device is provided, including: a measuring component 2, the measuring component 2 is suitable for being arranged between the bearing 1 and the support ring end 302, the measuring component 2 includes an elastic ring 202, the elastic ring 202 is suitable for being sleeved on the outer circumferential surface of the rotor shaft, the elastic ring 202 is suitable for being pasted with a strain gauge 2028, the first side surface of the elastic ring 202 is suitable for being fitted with the side surface of the outer ring of the bearing 1, and the second side surface of the elastic ring 202 is suitable for being fitted with the side surface of the support ring end 302.

[0030] By attaching the strain gauge 2028 to the elastic ring 202, there is no need to attach the strain gauge 2028 to the rotor bearing 1. The elastic ring 202 will be directly affected by the axial force and elastically deform. The entire structure does not need to consider the size and stiffness of the elastic structure of the rotor bearing 1, thereby avoiding the problem of the strain value being insensitive to the axial force and will not be affected by other factors, thereby effectively obtaining the value of the axial load.

[0031] In one embodiment, Figure 1 As shown, the first side surface of the elastic ring 202 is provided with at least three first bosses 2022, and the second side surface is provided with at least three second bosses 2023. Through the setting of the first bosses 2022, the force of the outer ring of the bearing 1 is transmitted to the elastic ring 202, and through the setting of the second bosses 2023, the force of the support ring end 302 is transmitted to the elastic ring 202.

[0032] In one embodiment, Figure 1 As shown, at least three first bosses 2022 on the first side are arranged with equal arcs, and at least three second bosses 2023 on the second side are arranged with equal arcs. The equal arc arrangement allows the force of the outer ring of the bearing 1 and the support ring end 302 to be evenly transmitted to the elastic ring 202.

[0033] It should be noted that the number of the first bosses 2022 and the second bosses 2023 is not limited in this embodiment. Figure 4 The number of the first bosses 2022 in the embodiment may be 8, such as Figure 5 The number of the first bosses 2022 can be 4, and the number of the first bosses 2022 can be set according to the actual situation on site, but the number of the first bosses 2022 and the second bosses 2023 on the two side surfaces of the same elastic ring 202 should be equal.

[0034] In one embodiment, Figure 1As shown, the arc between adjacent first bosses 2022 corresponds to a first angle 2024, and the arc between adjacent second bosses 2023 corresponds to a second angle. The number of first bosses 2022 and second bosses 2023 is equal, and the first angle 2024 and the second angle are equal. By setting the number of first bosses 2022 and second bosses 2023 equal, each side of the elastic ring 202 is subjected to uniform force. In this embodiment, the elastic ring, first bosses 2022, and second bosses 2023 are all made of elastically deformable materials, such as rubber, elastomeric plastic, elastic metal material, elastic foam material, elastic textile material, etc. The appropriate elastic material is selected based on the specific working conditions and is not specifically limited. Assuming the number of first bosses 2022 is n, the first angle 2024 between two adjacent first bosses 2022 is 2π / n; assuming the number of second bosses 2023 is n, the second angle between two adjacent second bosses 2023 is 2π / n.

[0035] In one embodiment, Figure 1 As shown, the center line of the first boss 2022 and the center point of the elastic ring 202 form a first ray 2026, the center line of the second boss 2023 and the center point of the elastic ring 202 form a second ray 2027, and a third angle 2025 is formed between the first ray 2026 and the second ray 2027. The degree of the first angle 2024 is twice the degree of the third angle 2025. By setting the third angle 2025, the first boss 2022 and the second boss 2023 are staggered to avoid the force transmitted by the outer ring of the bearing 1 and the force transmitted by the support ring end 302 offsetting each other when the first boss 2022 and the second boss 2023 are not staggered, thereby ensuring the transmission of force. A second boss 2023 is provided in the middle of two adjacent first bosses 2022, and a first boss 2022 is provided in the middle of two adjacent second bosses 2023, to ensure that the forces on both sides can be transmitted to the elastic ring 202. The third angle 2025 is π / n. It should be noted that the strain gauge 2028 is pasted on the back of the boss, that is, a first boss 2022 is provided on one side of the ring body 2021, and a strain gauge 2028 is provided on the other side of the ring body 2021, and the strain gauge 2028 and the first boss 2022 are arranged correspondingly across the ring body 2021, and one strain gauge 2028 corresponds to one first boss 2022 or one second boss 2023.

[0036] In one embodiment, Figure 1 As shown, the height of the first boss 2022 is the difference between the outer diameter and the inner diameter of the elastic ring 202. The first boss 2022 and the second boss 2023 have the same size. The length of the first boss 2022 is l, the width is b, and the height is h, where h is the difference between the outer diameter and the inner diameter of the elastic ring 202.

[0037] In one embodiment, Figure 1 As shown, the measurement assembly 2 further includes a first retaining ring 201 and a second retaining ring 203. The first side of the elastic ring 202 is aligned with the side of the first retaining ring 201, and the second side of the elastic ring 202 is aligned with the side of the second retaining ring 203. Specifically, the first retaining ring 201 and the second retaining ring 203 are made of the same material and are rigid and non-deformable, such as steel, aluminum, or nickel alloy. By placing retaining rings on both sides of the elastic structure and ensuring sufficient rigidity relative to the elastic rings, the linearity of the contact boundary during force measurement is ensured, avoiding the problem of boss deformation, which would lead to inconsistent strain under the same axial load during loading and unloading, when the retaining rings are not present.

[0038] In one embodiment, Figure 1 As shown, the thickness of the first retaining ring 201 and the second retaining ring 203 are equal, and the thickness of the first retaining ring 201 is at least three times the thickness of the ring body 2021. By placing retaining rings on both sides of the elastic structure, the thickness of the first retaining ring 201 or the second retaining ring 203 is greater than or equal to three times the thickness of the ring body 2021 of the elastic ring 202. This ensures sufficient rigidity of the retaining ring relative to the elastic ring 202, ensuring the linearity of the contact boundary during force measurement and avoiding the situation in which, in the absence of retaining rings, the boss deformation leads to inconsistent strain under the same axial load during loading and unloading. When an axial load F is applied to one retaining ring (usually on the side where the bearing 1 is located), the axial force is transmitted to the elastic ring 202 through the first boss 2022 or the second boss 2023, causing the elastic ring 202 to deform elastically. By attaching a strain gauge 2028 to the elastic ring 202, the corresponding relationship between the strain value ε and F is calibrated, and a functional relationship F = Kε is established between the two. It should be noted that the elastic ring 202, the first retaining ring 201 and the second retaining ring 203 are respectively sleeved on the outer circumference of the rotor shaft, the outer circumferences of the elastic ring 202, the first retaining ring 201 and the second retaining ring 203 are in contact with the limiting ring 3, and the limiting end 301 of the limiting ring 3 is fixed in position.

[0039] According to an embodiment of the present invention, on the other hand, a measurement system is also provided, including the above-mentioned rotor axial force measuring device, and also including a controller, which is connected to each strain gauge 2028 through a line to receive data from each strain gauge 2028, and then obtains the strain value through testing to establish a functional relationship between the axial load and the strain value, and convert it into the axial load.

[0040] A method for using a rotor axial force measuring device: in a loaded state, when one side of a bearing 1 is subjected to an axial force F, the bearing 1 will transmit the force to the measuring component 2, and the first baffle will transmit the force to the first boss 2022, so that the elastic ring 202 is subjected to a uniform force from the first boss 2022. Due to the supporting effect of the second baffle on the second boss 2023, the first boss 2022 and the second boss 2023 respectively act on the ring body 2021 to cause deformation, so that the strain gauge 2028 transmits data to a controller; in an unloaded state, due to the limiting effect of the second baffle 203, the deformation of the elastic ring 202 will slowly become 0, and the first boss 2022 will generate a force on the first baffle, and the strain gauge 2028 will transmit the relevant data to the controller. By setting the first retaining ring 201 and the second retaining ring 203, and making the retaining rings have sufficient rigidity relative to the elastic ring 202, the linearity of the contact boundary during the force measurement process is guaranteed, and the deformation of the first boss 2022 or the second boss 2023 in the absence of the retaining ring is avoided, resulting in inconsistent strain under the same axial load during loading and unloading.

[0041] The rotor axial force measuring device provided by the present invention has the following advantages: (1) by pasting the strain gauge 2028 on the elastic ring 202, there is no need to paste the strain gauge 2028 on the rotor bearing 1, and the elastic ring 202 will be directly affected by the axial force and elastically deformed. The entire structure does not need to consider the size and stiffness of the elastic structure of the rotor bearing 1, avoiding the problem that the strain value is insensitive to the axial force and will not be affected by other factors, thereby effectively obtaining the value of the axial load; (2) by setting the first retaining ring 201 and The second retaining ring 203 is provided, and the retaining ring has sufficient rigidity relative to the elastic ring 202 to ensure the linearity of the contact boundary during the force measurement process, and to avoid the problem that the first boss 2022 or the second boss 2023 is deformed in the absence of the retaining ring, resulting in inconsistent strain under the same axial load during loading and unloading; (3) The axial force is transmitted to the elastic ring 202 through the first boss 2022 or the second boss 2023, and the elastic ring 202 produces elastic deformation. By pasting a strain gauge 2028 on the elastic ring 202, the strain value ε is calibrated to correspond to F. The functional relationship F=Kε between the two is established; (4) by setting the first boss 2022 and the second boss 2023, a wide range of stable strain areas are formed between the double bosses under the action of axial load, which reduces the strain gradient at the large strain position, ensures the measurement stability during the measurement process, and can stably and reliably test the rotor axial force; (5) by setting bosses on both sides of the elastic ring, the thickness of the retaining ring is greater than or equal to 3 times the thickness of the ring body 2021, so that the boss has sufficient rigidity relative to the elastic ring, ensures the linearity of the contact boundary during the force measurement process, and avoids the deformation of the boss in the absence of the retaining ring, resulting in inconsistent strain under the same axial load during loading and unloading; (6) the size parameters of the elastic ring 202 can be adjusted according to actual needs to adapt to different axial force levels and engine rotor structures; (7) the strain gauge 2028 is attached to the middle position of the two adjacent bosses and is connected to the strain measurement device through a lead wire. According to the strain value obtained by the test and the functional relationship between the axial load and the strain value (F=Kε) established in the previous step, the axial load value is converted.

[0042] As an alternative embodiment, the number of the first bosses 2022 may also be n times (n≧2) the number of the second bosses 2023 , that is, n second bosses 2023 are provided for each first boss 2022 .

[0043] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A rotor axial force measuring device, characterized in that: include: A measuring assembly (2) is provided, wherein the measuring assembly (2) is adapted to be arranged between a bearing (1) and a support ring end (302), the measuring assembly (2) comprising an elastic ring (202), the elastic ring (202) being adapted to be sleeved on the outer peripheral surface of a rotor shaft, a strain gauge (2028) being adapted to be adhered to the elastic ring (202), a first side surface of the elastic ring (202) being adapted to be fitted with a side surface of an outer ring of the bearing (1), and a second side surface of the elastic ring (202) being adapted to be fitted with a side surface of the support ring end (302).

2. The rotor axial force measuring device according to claim 1, characterized in that: The first side surface of the elastic ring (202) is provided with at least three first bosses (2022), and the second side surface is provided with at least three second bosses (2023).

3. The rotor axial force measuring device according to claim 2, characterized in that: At least three first bosses (2022) on the first side surface are arranged with equal arcs, and at least three second bosses (2023) on the second side surface are arranged with equal arcs.

4. The rotor axial force measuring device according to claim 3, characterized in that: The arc between adjacent first bosses (2022) corresponds to a first angle (2024), and the arc between adjacent second bosses (2023) corresponds to a second angle. The number of the first bosses (2022) and the second bosses (2023) is equal, and the first angle (2024) and the second angle are equal.

5. The rotor axial force measuring device according to claim 4, characterized in that: The center line of the first boss (2022) and the center point of the elastic ring (202) form a first ray (2026), the center line of the second boss (2023) and the center point of the elastic ring (202) form a second ray (2027), a third angle (2025) is formed between the first ray (2026) and the second ray (2027), and the degree of the first angle (2024) is twice the degree of the third angle (2025).

6. The rotor axial force measuring device according to claim 2, characterized in that: The height of the first boss (2022) is the difference between the outer diameter and the inner diameter of the elastic ring (202), and the first boss (2022) and the second boss (2023) have the same size.

7. The rotor axial force measuring device according to claim 1, characterized in that: The measuring assembly (2) further comprises a first retaining ring (201) and a second retaining ring (203), wherein the first side surface of the elastic ring (202) is fitted with the side surface of the first retaining ring (201), and the second side surface of the elastic ring (202) is fitted with the side surface of the second retaining ring (203).

8. The rotor axial force measuring device according to claim 7, characterized in that: The thickness of the first retaining ring (201) is equal to the thickness of the second retaining ring (203), and the thickness of the first retaining ring (201) is at least three times the thickness of the ring body (2021).

9. A measurement system, characterized in that The invention comprises the rotor axial force measuring device according to any one of claims 1 to 8.

10. A method for using a rotor axial force measuring device, for using the rotor axial force measuring device according to claim 1, characterized in that: The axial force of the rotor shaft is transmitted to the elastic ring (202) through the bearing (1) or the support ring end (302). The elastic ring (202) is elastically deformed by the force. The strain gauge (2028) on the elastic ring (202) senses the deformation of the elastic ring (202) and thus obtains the value of the axial force.

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