An anti-falling nested force measuring ring structure

Abstract

The present invention provides a nested force-measuring ring structure with an anti-dropout mechanism. The force-measuring ring has a nested structure and primarily consists of an elastic ring, a housing, a strain gauge, and a conductive wire. Both the elastic ring and the housing are annular structures. The elastic ring is positioned within the housing with a clearance fit, allowing for a small range of axial movement within the housing. The strain gauge is attached to an arc-shaped connecting plate in the middle of the elastic ring, and the conductive wire is connected to external testing equipment through a through-hole in the housing. The nested structure completely isolates the strain gauge from the lubricating oil chamber. Even if the strain gauge were to drop out, it would not enter the lubricating oil chamber and affect the normal operation of the bearing. This solves the problem of the force-measuring ring being unable to operate with the gas turbine for a long time, shortens the gas turbine test cycle, improves test efficiency, and avoids waste of manpower and material resources.

Description

Technical Field

[0001] The patent of this invention belongs to the field of axial force testing of marine gas turbine rotors, and in particular, relates to an anti-fall-off nested force measuring ring structure. Background Art

[0002] Ball bearings, as the primary rotor support components, are widely used in marine gas turbines. The axial force of the gas turbine rotor is primarily borne by the ball bearings. Excessive or insufficient axial loads will increase bearing wear, impacting the safe operation of the gas turbine. Therefore, during factory testing of gas turbines, the rotor axial force must be tested and adjusted to ensure it remains within a reasonable range.

[0003] The traditional method for measuring the axial force of a gas turbine rotor is to place a force ring on the end face of the outer ring of a ball bearing. Under the action of axial force, the outer ring of the bearing presses the force ring, causing the force ring to deform, and then causing the strain gauge attached to the surface of the force ring to deform. The strain signal is transmitted to the signal acquisition device through a signal line, and the rotor axial force is obtained through the pre-calibrated strain and axial force data.

[0004] In traditional force ring systems, strain gauges are adhered to the surface of the force ring. This adhesive can easily fail during extended operation of the gas turbine, causing the strain gauges to fall off and enter the lubricating oil chamber, damaging the bearings and impacting the normal operation of the gas turbine. Therefore, traditional force ring systems are only used during factory testing. Before the gas turbine is shipped, the force ring must be removed, adding another round of gas turbine disassembly and assembly, typically taking around 10 days and wasting significant manpower and resources. Summary of the Invention

[0005] In view of the shortcomings of the traditional force measuring ring structure, the present invention proposes an anti-falling nested force measuring ring structure, which can completely prevent the strain gauge from falling into the lubricating oil chamber and causing the possibility of bearing failure.

[0006] The technical solutions proposed by the present invention are as follows:

[0007] A nested force measuring ring structure with anti-dropping characteristics is characterized in that it includes an elastic ring, a shell, a strain gauge and a wire; wherein the elastic ring and the shell are both annular structures, the elastic ring is placed inside the shell, and is a clearance fit, the elastic ring can move axially inside the shell, and the wire can be connected to the external testing equipment through the through hole on the shell, so that the strain gauge is completely separated from the lubricating oil chamber; the elastic ring is composed of three parts: two side ring plates and an arc-shaped connecting plate, the arc-shaped connecting plate connects the two side ring plates, and a strain gauge is pasted on the surface of the arc-shaped connecting plate. When the force measuring ring is subjected to axial force, the arc-shaped connecting plate is also deformed by force, thereby causing the strain gauge to deform, and a strain signal can be output to the outside to complete the axial force measurement.

[0008] Furthermore, the strain gauge is adhered to the convex surface of the arc-shaped connecting plate;

[0009] Furthermore, the force measuring ring is installed between the bearing outer ring and the pressure ring;

[0010] Furthermore, the shell is an annular structure with one side open and three sides closed;

[0011] Furthermore, the arc-shaped connecting plates are evenly distributed between the ring plates on both sides;

[0012] Furthermore, the number of the arc-shaped connecting plates is 18;

[0013] Furthermore, the gap is 0.2 mm.

[0014] The present invention has the following beneficial effects:

[0015] One end face of the elastic ring of the present invention contacts the outer ring of the bearing, and the other three surfaces are completely placed inside the housing. The strain gauge is adhered to the arc-shaped connecting plate inside the elastic ring, so that the strain gauge is completely separated from the lubricating oil chamber. Even if the strain gauge falls off, it cannot enter the lubricating oil chamber. Therefore, the present invention solves the problem that the force measuring ring cannot operate with the gas turbine for a long time. The force measuring ring structure can be used on the unit for a long time, avoiding repeated disassembly and assembly of the gas turbine, saving test cycles, and avoiding waste of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the installation arrangement of the nested force ring of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the nested force measuring ring of the present invention;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the elastic ring of the present invention;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the shell of the present invention;

[0020] Figure 5 This is a schematic diagram of the internal structure of the elastic ring of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] The anti-drop nested force measuring ring of the present invention is arranged in the following position: Figure 1As shown in the figure, the dynamometer ring 4 contacts the end face of the outer ring of the bearing 2 and is compressed by the pressure ring 5. The inner ring of the bearing 2 is fixed to the outer surface of the rotating shaft 3 by the nut 6. The outer ring of the bearing 2 is fixed to the inner end face of the bearing seat 1 by the dynamometer ring 4 and the pressure ring 5. The axial force of the rotating shaft 3 is transmitted to the dynamometer ring 4 through the inner ring of the bearing 2, the bearing balls, and the outer ring of the bearing 2.

[0023] Furthermore, the nested force measuring ring structure 4 of the present invention is mainly composed of an elastic ring 8, a housing 7, a strain gauge 9, and a wire 10. The two-dimensional cross-sectional structure is as follows: Figure 2 As shown, the strain gauge 9 is pasted on the elastic ring 8.

[0024] Furthermore, the elastic ring 8 and the housing 7 are both annular structures, and the elastic ring 8 is placed inside the housing 7 with a clearance fit of 0.2 mm. The elastic ring 8 can move axially within a small range inside the housing 7.

[0025] Furthermore, the three-dimensional structures of the elastic ring 8 are respectively as follows Figure 3 As shown. The elastic ring 8 consists of three parts, namely the ring plate 8-1, the ring plate 8-2, and the elastic connecting plate 8-3. The elastic connecting plate 8-3 is an arc-shaped plate structure with 18 evenly distributed points in the whole circle. Strain gauges 9 are attached to the surface of the elastic connecting plate 8-3. The cross-sectional position of the elastic ring 8 is shown as follows. Figure 5 shown.

[0026] Furthermore, the three-dimensional structures of the housing 7 are respectively as follows Figure 4 The housing 7 is an annular structure with one end open.

[0027] Furthermore, when the elastic ring 8 is subjected to an axial force, the elastic connecting plate 8-3 is deformed by the force, thereby deforming the strain gauge 9. The strain signal can be output to the outside through the wire 10, and the axial force measurement is completed through the signal acquisition equipment.

[0028] Furthermore, when the left end of the elastic ring 8 is deformed by pressure, the inner and outer surfaces of the elastic ring 8 can move freely on the inner surface of the housing 7, but the strain gauge 9 will not be exposed outside the housing 7. Therefore, if the strain gauge 9 suddenly falls off, the strain gauge 9 will be retained inside the housing 7 and will not enter the lubricating oil chamber to affect the normal operation of the bearing.

[0029] The novel force ring system of the present invention can effectively avoid the problem of bearing damage caused by strain gauge falling off when the gas turbine works for a long time, saves the test cycle, improves the test efficiency of the unit, and avoids the waste of manpower and material resources.

[0030] The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An anti-drop nested force measuring ring structure, characterized by: The device comprises an elastic ring, a housing, a strain gauge, and a conductive wire. The elastic ring and the housing are both annular structures. The elastic ring is placed inside the housing with a clearance fit, allowing the elastic ring to move axially within the housing. The conductive wire can be connected to external testing equipment through a through hole in the housing, completely isolating the strain gauge from the lubricating oil chamber. The elastic ring is composed of three parts: two side ring plates and an arc-shaped connecting plate. The arc-shaped connecting plate connects the two side ring plates, and a strain gauge is affixed to the surface of the arc-shaped connecting plate. When the force measuring ring is subjected to axial force, the arc-shaped connecting plate is also deformed by the force, thereby causing the strain gauge to deform, thereby outputting a strain signal to complete the axial force measurement. The shell is an annular structure with one side open and three sides closed; the arc-shaped connecting plates are evenly distributed between the ring plates on both sides; the number of the arc-shaped connecting plates is 18; the strain gauge is pasted on the convex surface of the arc-shaped connecting plate; the force measuring ring is installed between the outer ring of the bearing and the pressure ring; the gap is 0.2 mm.

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