Coupling

Abstract

A coupler is used for achieving deviation compensation and impact protection. The coupling comprises a first pipe fitting and a shaft piece; the first pipe fitting is used for being connected with one of the driving shaft and the driven shaft and comprises a straight pipe section and a taper pipe section which are connected with each other, the central axes of the straight pipe section and the taper pipe section coincide, and the taper pipe section inclines towards the peripheral side from the straight pipe section and is elastic. The shaft piece is used for connecting the other one of the driving shaft and the driven shaft and is provided with a plurality of connecting pieces which are uniformly distributed in the circumferential direction, the connecting pieces protrude towards the peripheral side of the shaft piece, and the connecting pieces are elastic; wherein the shaft piece is inserted into the straight pipe section and the taper pipe section, and the shaft piece is matched with a shaft hole of the straight pipe section and allows axial sliding; the connecting piece is connected with the taper pipe section, and the connecting piece is configured to be damaged by set torque.

Description

Technical Field

[0001] This invention relates to transmission technology, and more specifically to a coupling. Background Technology

[0002] Overspeed testing apparatus is the main testing device for evaluating the fatigue strength of mechanical disc-type rotor structural components. It is used to solve various strength and stiffness problems such as strength reserve and service life assessment.

[0003] In the overspeed test of the turbine rotor, the main motor and gearbox typically provide the turbine rotor with a high speed exceeding 10,000 revolutions per minute and a maximum torque exceeding 3,000 Newton-meters. During the test, the turbine rotor is driven to rotate by the motor connected to the gearbox through a coupling. Errors in the manufacturing and installation process of the turbine rotor may cause shaft misalignment, axial runout, etc., which may disrupt the dynamic balance, induce impact torque, and damage the test equipment and the turbine rotor. Summary of the Invention

[0004] The purpose of this invention is to provide a coupling for achieving deviation compensation and impact protection.

[0005] According to an embodiment of the present invention, the coupling includes a first tube and a shaft; the first tube is used to connect one of a driving shaft and a driven shaft, and includes a straight tube section and a tapered tube section that are interconnected and whose central axes coincide, the tapered tube section being inclined outward from the straight tube section and having elasticity; the shaft is used to connect the other of the driving shaft and the driven shaft, and is provided with a plurality of circumferentially evenly distributed connecting pieces, the connecting pieces protruding outward from the outer periphery of the shaft and having elasticity; wherein, the shaft is inserted into the straight tube section and the tapered tube section, the shaft engaging with the shaft hole of the straight tube section and allowing axial sliding; the connecting pieces connect the tapered tube section, and the connecting pieces are configured to be destroyed by a set torque.

[0006] In one or more embodiments, the connecting piece extends radially from the outer peripheral surface of the shaft.

[0007] In one or more embodiments, the tapered tube section has a flange at its end for threaded connection to the connecting piece.

[0008] In one or more embodiments, the shaft is coaxially transition-fitted with the straight pipe section.

[0009] In one or more embodiments, the wall thickness of the tapered pipe section is less than the wall thickness of the straight pipe section to make the tapered pipe section elastic.

[0010] In one or more embodiments, the shaft is provided by a second tubular component.

[0011] In one or more embodiments, the thickness of the connecting piece is less than the wall thickness of the second pipe fitting to make the connecting piece elastic.

[0012] In one or more embodiments, both the first pipe and the shaft are provided with a dynamic balancing ring protruding outwards, and the dynamic balancing ring is provided with a threaded hole.

[0013] In one or more embodiments, the shaft is provided with four connecting pieces.

[0014] The embodiments of the present invention have at least one of the following beneficial effects:

[0015] When there is a radial misalignment between the drive shaft and the driven shaft, the tapered tube section and the connecting plate can bend and tilt relative to the central axis, thereby placing the two ends of the coupling at different radial positions to compensate for the radial misalignment. When there is an axial misalignment between the drive shaft and the driven shaft, the tapered tube section and the connecting plate can bend and tilt relative to the central axis, compressing or lengthening the axial length of the tapered tube section and the connecting plate. At this time, the shaft slides axially within the straight tube section, thereby adjusting the axial position of the two ends of the coupling to compensate for the axial misalignment. When there is an excessive torque, such as an impact torque, between the drive shaft and the driven shaft, if the torque reaches the set torque, the connecting plate will be damaged, and the torque transmission between the first tube and the shaft will fail, preventing excessive torque from damaging the drive shaft and the driven shaft, thus achieving over-torque protection. After the connecting plate is damaged, the straight tube section and the shaft hole of the shaft fit together to prevent the shaft from coming out of the straight tube section, keeping the shaft within the straight tube section, preventing the shaft from coming out of the first tube section and forming a cantilever swing, which would damage the drive shaft and the driven shaft, and protecting the operator. Attached Figure Description

[0016] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a front sectional view of the coupling, with the cutting plane passing through the central axis of the coupling;

[0018] Figure 2 This is the right view of the coupling.

[0019] Figure label:

[0020] 1-Coupling;

[0021] 2-First fitting;

[0022] 3-Shaft components;

[0023] 4-Straight pipe section;

[0024] 5-Coiled pipe section;

[0025] 6-Connecting piece;

[0026] 7-Second fitting;

[0027] 8-Flange;

[0028] 9-Dynamic balancing ring. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0030] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0031] The terms “first”, “second”, etc., are used interchangeably to distinguish one feature from another and are not intended to indicate that each feature must be located in the position shown in the figure in each embodiment.

[0032] like Figure 1 As shown, coupling 1 includes a first tubular component 2 and a shaft component 3. Further integration... Figure 2The first pipe fitting 2 includes a straight pipe section 4 and a tapered pipe section 5, which are interconnected. The central axis of the straight pipe section 4 coincides with the central axis of the tapered pipe section 5. The inner cavity of the straight pipe section 4 communicates with the inner cavity of the tapered pipe section 5. The tapered pipe section 5 is inclined outward from the straight pipe section 4, connects to the axial end of the straight pipe section 4, and its wall is inclined outward from the outer periphery of the straight pipe section 4. A shaft fitting 3 is provided with a plurality of circumferentially distributed connecting pieces 6, which protrude from the shaft fitting 3 towards its outer periphery. In the illustrated embodiment, the shaft fitting 3 may have four circumferentially distributed connecting pieces 6. The shaft fitting 3 is inserted into the straight pipe section 4 and the tapered pipe section 5. The shaft fitting 3 passes through the inner cavity of the tapered pipe section 5 from its axial end and enters the inner cavity of the straight pipe section 4. The shaft fitting 3 and the straight pipe section 4 form a shaft-hole fit, allowing the straight pipe section 4 and the shaft fitting 3 to slide relative to each other axially. The connecting pieces 6 connect the tapered pipe section 5, thereby transmitting torque. When coupling 1 is in use, the first pipe fitting 2 connects one of the driving shaft and the driven shaft, and the shaft fitting 3 connects the other of the driving shaft and the driven shaft. Torque is transmitted between the first pipe fitting 2 and the shaft fitting 3 through the connection of the connecting plate 6 and the tapered pipe section 5. The tapered pipe section 5 drives the connecting plate 6 to rotate, causing the first pipe fitting 2 to drive the shaft fitting 3 to rotate; conversely, the connecting plate 6 drives the tapered pipe section 5 to rotate, causing the shaft fitting 3 to drive the first pipe fitting 2 to rotate. Both the tapered pipe section 5 and the connecting plate 6 are elastic. When there is a radial deviation between the driving shaft and the driven shaft, such as shaft alignment misalignment, the tapered pipe section 5 and the connecting plate 6 can bend and tilt relative to the central axis, thereby placing the two ends of coupling 1 in different radial positions to compensate for the radial deviation. When there is an axial deviation between the driving shaft and the driven shaft, such as axial runout misalignment, the tapered pipe section 5 and the connecting plate 6 can bend and tilt relative to the central axis, compressing or lengthening the axial length of the tapered pipe section 5 and the connecting plate 6. At this time, the shaft fitting 3 slides axially within the straight pipe section 4, thereby adjusting the axial position of the two ends of coupling 1 to compensate for the axial deviation. Connecting piece 6 is configured to be destroyed by a set torque. When there is excessive torque, such as impact torque, between the drive shaft and the driven shaft, if the torque reaches the set torque, connecting piece 6 will be sheared and broken, causing torque transmission between the first pipe 2 and the shaft 3 to fail. This prevents excessive torque from damaging the drive shaft and driven shaft, such as damaging the test device and turbine rotor in a turbine rotor over-speed test, thus achieving over-torque protection. After connecting piece 6 is destroyed, the straight pipe section 4 and the shaft hole of the shaft 3 cooperate to prevent the shaft 3 from dislodging from the straight pipe section 4, keeping the shaft 3 within the straight pipe section 4. This prevents the shaft 3 from dislodging from the first pipe 2 and causing cantilever swing, which could damage the drive shaft and driven shaft, such as damaging the test device and turbine rotor in a turbine rotor over-speed test, and also protects the operators.

[0033] like Figure 1 As shown, the shaft 3 can be provided by the second tube 7, which has a hollow inner cavity to reduce weight.

[0034] like Figure 1As shown, the connecting piece 6 can extend radially from the outer circumferential surface of the shaft 3, and the connecting piece 6 is perpendicular to the central axis of the first pipe 2 and the shaft 3. When there is a radial deviation between the driving shaft and the driven shaft, the tapered pipe section 5 and the connecting piece 6 can bend and tilt relative to the central axis. The connecting piece 6 on one side bends and tilts towards the side where the shaft 3 is located, and the connecting piece 6 on the opposite side bends and tilts towards the side where the first pipe 2 is located. The bending and tilting angles of the connecting pieces 6 on both sides are similar. Since the angle between the connecting piece 6 and the outer circumferential surface of the shaft 3 is 90° before bending and tilting, the angle between the connecting pieces 6 on both sides and the outer circumferential surface of the shaft 3 is also similar after bending and tilting, but the bending and tilting directions are different. This makes the stress level at the connection between the connecting pieces 6 on both sides and the shaft 3 similar, avoiding the stress level difference at the connection between the connecting pieces 6 on both sides and the shaft 3, which would cause the stress at the connection between the connecting pieces 6 on one side and the shaft 3 to be too high and break.

[0035] like Figure 1 As shown, the wall thickness of the tapered pipe section 5 can be less than that of the straight pipe section 4 to make the tapered pipe section 5 elastic. The tapered pipe section 5 can be made of the same material as the straight pipe section 4. The wall thickness of the tapered pipe section 5 is thinner than that of the straight pipe section 4, so the tapered pipe section 5 is more likely to undergo elastic deformation.

[0036] like Figure 1 As shown, the thickness of the connecting piece 6 can be less than the wall thickness of the second pipe 7 to make the connecting piece 6 elastic. The connecting piece 6 can be made of the same material as the second pipe 7. The axial thickness of the connecting piece 6 is thinner than the wall thickness of the second pipe 7, so the connecting piece 6 can easily undergo elastic deformation.

[0037] like Figure 1 As shown, the tapered tube section 5 can be provided with a flange 8 at the end, and each connecting piece 6 can be provided with a mounting hole and threadedly connected to the flange 8 by a threaded fastener. This facilitates the assembly and disassembly of the tapered tube section 5 and the connecting piece 6, thereby facilitating the assembly and disassembly of the shaft 3 and the first tube 2.

[0038] like Figure 1 As shown, shaft 3 and straight pipe section 4 can form a coaxial transition fit. The transition fit allows axial relative sliding between shaft 3 and straight pipe section 4, thus allowing axial deviation compensation of coupling 1. The transition fit also restricts shaft 3 from disengaging from straight pipe section 4 after connecting piece 6 is damaged, thereby preventing cantilever swing. If shaft 3 and straight pipe section 4 use an interference fit, the fit is too tight, making axial relative sliding difficult, and coupling 1 cannot compensate for axial deviation. If shaft 3 and straight pipe section 4 use a clearance fit, the fit is too loose, and shaft 3 easily disengages from straight pipe section 4 after connecting piece 6 is damaged, causing cantilever swing.

[0039] like Figure 1As shown, both the first pipe fitting 2 and the shaft fitting 3 can be provided with dynamic balancing rings 9 protruding outwards. The dynamic balancing ring 9 of the first pipe fitting 2 can protrude outwards from the outer circumference of the first pipe fitting 2, and the dynamic balancing ring 9 of the shaft fitting 3 can protrude outwards from the outer circumference of the shaft fitting 3. The dynamic balancing rings 9 are provided with threaded holes (not shown in the figure), which can be evenly distributed circumferentially on the dynamic balancing rings 9. When dynamic balancing is required, threaded fasteners can be connected to the threaded holes at a certain circumferential position of the dynamic balancing ring 9, or material can be removed from a certain circumferential position of the dynamic balancing ring 9 to adjust the circumferential mass distribution and achieve dynamic balance. The dynamic balancing rings 9 protrude outwards to avoid insufficient strength and stiffness due to excessively thin local material thickness after material removal. The material of the dynamic balancing rings 9 can be removed by grinding.

[0040] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A coupling, characterized in that... include: The first pipe fitting, used to connect one of the drive shaft and the driven shaft, includes a straight pipe section and a tapered pipe section that are connected to each other and whose central axes coincide, the tapered pipe section being inclined from the straight pipe section to the outer periphery and having elasticity; as well as A shaft member, used to connect one of a drive shaft and a driven shaft, is provided with a plurality of circumferentially distributed connecting pieces, the connecting pieces protruding to the outer periphery of the shaft member, and the connecting pieces are elastic; in, The shaft is inserted into the straight pipe section and the tapered pipe section, and the shaft engages with the shaft hole of the straight pipe section and allows axial sliding. The connecting piece connects to the tapered tube section, and the connecting piece is configured to be destroyed by a set torque.

2. The coupling according to claim 1, characterized in that: The connecting piece extends radially from the outer peripheral surface of the shaft.

3. The coupling according to claim 1, characterized in that: The tapered tube section has a flange at its end for threaded connection to the connecting piece.

4. The coupling according to claim 1, characterized in that: The shaft component is coaxially transition-fitted with the straight pipe section.

5. The coupling according to claim 1, characterized in that: The wall thickness of the tapered pipe section is less than that of the straight pipe section to make the tapered pipe section elastic.

6. The coupling according to claim 1, characterized in that: The shaft is provided by the second pipe fitting.

7. The coupling according to claim 6, characterized in that: The thickness of the connecting piece is less than the wall thickness of the second pipe fitting to make the connecting piece elastic.

8. The coupling according to claim 1, characterized in that: Both the first pipe and the shaft are provided with dynamic balancing rings that protrude outwards, and the dynamic balancing rings are provided with threaded holes.

9. The coupling according to claim 1, characterized in that: The shaft is provided with four connecting pieces.

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