A double diaphragm coupling with limited radial displacement and overload protection

Abstract

This invention relates to a double diaphragm coupling that limits radial displacement and provides overload protection. The invention includes a driving adapter plate, comprising a first adapter plate flange and a first connecting surface extending axially along the center of the first adapter plate flange; a driven adapter plate, comprising a second adapter plate flange and a second connecting surface extending axially along the center of the second adapter plate flange; a spacer shaft with circumferentially spaced third connecting blocks extending axially; the first connecting surface and its corresponding third connecting surface are mated by engagement of the first and third connecting blocks; the second connecting surface and its corresponding third connecting surface are mated by engagement of the second and third connecting blocks. This invention limits the radial displacement of the diaphragm coupling when it is subjected to radial offset, preventing damage to the diaphragm and protecting the diaphragm coupling.

Description

Technical Field

[0001] This invention relates to the field of double diaphragm coupling technology, and in particular to a double diaphragm coupling that limits radial displacement and provides overload protection. Background Technology

[0002] Diaphragm couplings are widely used in the coupling transmission of rotating machinery such as compressors, pumps, and fans due to their advantages such as no need for lubrication, compensation for certain shaft misalignment, and high transmission efficiency. Double diaphragm couplings typically compensate for shaft misalignment, including angular misalignment, axial movement, and a certain degree of radial misalignment, through the elastic deformation of the diaphragm assembly. This reduces the additional load on the equipment bearings while transmitting torque.

[0003] However, under operating conditions with large torque fluctuations or frequent periodic changes in radial load, the diaphragm assembly will repeatedly endure alternating radial displacement and stress cycles, which can easily lead to fatigue cracks and ultimately diaphragm failure. Once the diaphragm breaks or fails, the torque transmission capacity of the coupling will rapidly decrease, and in severe cases, there may be safety risks such as uncontrolled acceleration on the driven side, which could lead to a runaway accident, causing equipment damage and personnel safety hazards. Summary of the Invention

[0004] Therefore, the present invention provides a double diaphragm coupling that limits radial displacement and provides overload protection. When the diaphragm coupling is subjected to radial offset, it can limit the radial displacement of the diaphragm coupling, preventing damage to the diaphragm and thus protecting the diaphragm coupling.

[0005] To solve the above-mentioned technical problems, the present invention provides a double diaphragm coupling that limits radial displacement and provides overload protection, comprising: An active adapter plate includes a first adapter plate flange and a first connecting surface extending axially along the middle of the first adapter plate flange. The first connecting surface is circumferentially spaced with first connecting blocks extending axially. The driven adapter plate includes a second adapter plate flange and a second connecting surface extending axially along the middle of the second adapter plate flange. The second connecting surface is circumferentially spaced with second connecting blocks extending axially. The spacer shaft includes spacer shaft flanges arranged opposite each other along the axial direction and a third connecting surface extending axially along the middle of each spacer shaft flange, and third connecting blocks extending axially are distributed circumferentially along each third connecting surface. Wherein, diaphragm assemblies are respectively provided between the first adapter plate flange and the second adapter plate flange and the corresponding spacer shaft flange; The first connecting surface and its corresponding third connecting surface are connected by the engagement of the first connecting block and the third connecting block; the second connecting surface and its corresponding third connecting surface are connected by the engagement of the second connecting block and the third connecting block.

[0006] In one embodiment of the present invention, the first connecting block and the second connecting block respectively engage with one circumferential end of the third connecting block via a first contact surface.

[0007] In one embodiment of the present invention, the first contact surface includes a first mating surface, a second mating surface, and a third mating surface arranged at an angle, wherein the first mating surface and the third mating surface extend relative to each other at both ends of the second mating surface and are both arranged at an angle to the second mating surface.

[0008] In one embodiment of the present invention, the second mating surface is disposed on one radial side of the central axis of the spacer shaft and extends circumferentially, and the first mating surface and the third mating surface are circumferentially spaced along the central axis of the spacer shaft and extend radially.

[0009] In one embodiment of the present invention, the first mating surface, the second mating surface, and the third mating surface are planar or arc-shaped mating surfaces.

[0010] In one embodiment of the present invention, the first connecting block and the second connecting block respectively engage with the other end of the third connecting block in the circumferential direction through a second contact surface.

[0011] In one embodiment of the present invention, the second contact surface is a planar or arc-shaped surface.

[0012] In one embodiment of the present invention, first bolt holes are distributed at intervals along the circumference of the first adapter flange; First clearance holes are distributed at intervals along the circumference of the second adapter flange; A second clearance hole is circumferentially distributed along one of the spacer shaft flanges; a second bolt hole is circumferentially distributed along the other spacer shaft flange. The first bolt hole and the second clearance hole are respectively provided and connected by a first connecting component; the first clearance hole and the second bolt hole are respectively provided and connected by a second connecting component.

[0013] In one embodiment of the present invention, the first connecting assembly and / or the second connecting assembly includes a bushing, a tapered washer, a spacer shaft, a reamed bolt, and a nut; The reamed bolt passes through the corresponding first bolt hole or second bolt hole, and sequentially passes through the corresponding first diaphragm assembly or second diaphragm assembly, the conical washer, and the bushing, and then exits through the corresponding first clearance hole or second clearance hole and is fastened to the nut. The bushing is disposed in the first clearance hole or the second clearance hole, and a radial gap is provided between the outer peripheral surface of the bushing and the hole wall of the first clearance hole or the second clearance hole.

[0014] The technical solution of the present invention has the following advantages over the prior art: This invention discloses a double diaphragm coupling that limits radial displacement and provides overload protection. It features a first connecting surface, a second connecting surface, and a third connecting surface on the corresponding end faces of the driving adapter, the driven adapter, and the spacer shaft. First connecting blocks, second connecting blocks, and third connecting blocks are arranged circumferentially at intervals on each connecting surface. The engagement of these connecting blocks achieves both limiting and protection functions. Compared to solutions that add independent limiting mechanisms, this structure is easier to manufacture, assemble, and maintain. Through the first contact surface mating between the first, second, and third connecting blocks, contact is triggered when radial displacement increases, creating radial limiting between the driving adapter, the driven adapter, and the spacer shaft. This suppresses excessive radial displacement and stress cycling on the diaphragm assembly, reduces the probability of fatigue cracks, and improves the lifespan of the diaphragm assembly and the overall reliability of the coupling.

[0015] The present invention utilizes the first contact surface engagement between the first connecting block, the second connecting block and the third connecting block to form a short-term substitute for the diaphragm to transmit torque when the diaphragm assembly fails or is overloaded and cannot reliably transmit torque. This allows the active side torque to be transmitted to the spacer shaft and the driven side via the meshing of the connecting blocks, reducing the risk of runaway acceleration on the driven side and improving the operational safety of the unit. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the double diaphragm coupling that limits radial displacement and provides overload protection according to the present invention.

[0018] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0019] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0020] Figure 4 yes Figure 1 A magnified view of a portion of point A in the middle.

[0021] Figure 5 yes Figure 1 A magnified view of a section at point B.

[0022] Explanation of reference numerals in the instruction manual: 1. Active adapter plate; 11. First adapter plate flange; 111. First bolt hole; 12. First connecting block; 2. Driven adapter plate; 21. Second adapter plate flange; 211. First clearance hole; 22. Second connecting block; 3. Spacer shaft; 31. Spacer shaft flange; 311. Second clearance hole; 312. Second bolt hole; 32. Third connecting block; 4. First contact surface; 41. First mating surface; 42. Second mating surface; 43. Third mating surface; 5. Second contact surface; 6. Diaphragm assembly; 7a. First connecting assembly; 7b. Second connecting assembly; 71. Bushing; 72. Tapered washer; 73. Spacer shaft; 74. Reamed hole bolt; 75. Nut. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0024] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0027] Reference Figures 1 to 5 As shown, the present invention provides a double diaphragm coupling for limiting radial displacement and providing overload protection, comprising: The active adapter plate 1 includes a first adapter plate flange 11 and a first connecting surface extending axially along the middle of the first adapter plate flange 11. The first connecting surface is circumferentially spaced with first connecting blocks 12 extending axially. The driven adapter plate 2 includes a second adapter plate flange 21 and a second connecting surface extending axially along the middle of the second adapter plate flange 21. The second connecting surface is circumferentially spaced with second connecting blocks 22 extending axially. The spacer shaft 3 includes spacer shaft flanges 31 arranged opposite each other along the axial direction and a third connecting surface extending axially along the middle of each spacer shaft flange 31, and third connecting blocks 32 extending axially are distributed circumferentially along each of the third connecting surfaces. Wherein, the first adapter plate flange 11 and the second adapter plate flange 21 are respectively provided with diaphragm assemblies 6 between them and the corresponding spacer shaft flange 31; The first connecting surface and its corresponding third connecting surface are connected by the engagement of the first connecting block 12 and the third connecting block 32; the second connecting surface and its corresponding third connecting surface are connected by the engagement of the second connecting block 22 and the third connecting block 32.

[0028] In one embodiment, the first connecting block 12 and the second connecting block 22 respectively engage with one circumferential end of the third connecting block 32 via a first contact surface 4.

[0029] In one embodiment, the first contact surface 4 includes a first mating surface 41, a second mating surface 42, and a third mating surface 43 arranged at an angle. The first mating surface 41 and the third mating surface 43 extend relative to each other at both ends of the second mating surface 42 and are both arranged at an angle to the second mating surface 42 (e.g., L-shaped).

[0030] In one embodiment, the second mating surface 42 is disposed on one radial side of the central axis of the spacer shaft 3 and extends circumferentially, while the first mating surface 41 and the third mating surface 43 are circumferentially spaced along the central axis of the spacer shaft 3 and extend radially.

[0031] In one embodiment, the first mating surface 41, the second mating surface 42, and the third mating surface 43 are planar or arc-shaped mating surfaces.

[0032] In one embodiment, the first connecting block 12 and the second connecting block 22 respectively engage with the other end of the third connecting block 32 in the circumferential direction via a second contact surface 5.

[0033] In one embodiment, the second contact surface 5 is a planar or curved surface.

[0034] In one embodiment, first bolt holes 111 are distributed circumferentially along the first adapter flange 11; First clearance holes 211 are distributed circumferentially along the second adapter flange 21; Second clearance holes 311 are circumferentially distributed along one of the spacer shaft flanges 31 of the spacer shaft 3; second bolt holes 312 are circumferentially distributed along the other spacer shaft flange 31 of the spacer shaft 3. The first bolt hole 111 and the second clearance hole 311 are respectively provided and connected by a first connecting component 7a; the first clearance hole 211 and the second bolt hole 312 are respectively provided and connected by a second connecting component 7b.

[0035] In one embodiment, refer to Figure 1 As shown, the first connecting assembly 7a and / or the second connecting assembly 7b includes a bushing 71, a tapered washer 72, a spacer shaft 3, a reamed bolt 74, and a nut 75; The reamed bolt 74 passes through the corresponding first bolt hole 111 or the second bolt hole 312, and then passes through the corresponding first diaphragm assembly 6 or the second diaphragm assembly 6, the conical washer 72, and the bushing 71 in sequence. Finally, it passes out through the corresponding first clearance hole 211 or the second clearance hole 311 and is fastened to the nut 75. The bushing 71 is disposed in the first clearance hole 211 or the second clearance hole 311, and a radial gap is provided between the outer peripheral surface of the bushing 71 and the hole wall of the first clearance hole 211 or the second clearance hole 311.

[0036] The working principle of this invention is as follows: 1. When the diaphragm coupling is subjected to a large radial displacement, the radial surfaces of the driving and driven transition plates 1 and 2 mesh and abut with the corresponding connecting blocks of the spacer shaft 3 (the driving and driven transition plates 1 and 2 respectively engage with the second mating surface 42 of the spacer shaft 3), limiting the large radial displacement of the diaphragm and protecting the normal operation of the diaphragm coupling.

[0037] 2. When the diaphragm coupling is overloaded, causing the diaphragm to fail and be damaged, the circumferential surfaces of the active transfer plate 1 and the driven transfer plate 2 mesh and abut with the corresponding connecting blocks of the spacer shaft 3 (the active transfer plate 1 and the driven transfer plate 2 respectively cooperate with the first mating surface 41 and the third mating surface 43 of the spacer shaft 3), replacing the diaphragm to transmit torque for a short time, protecting the unit from runaway.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double diaphragm coupling that limits radial displacement and provides overload protection, characterized in that, include: The active adapter plate (1) includes a first adapter plate flange (11) and a first connecting surface extending axially along the middle of the first adapter plate flange (11), wherein the first connecting surface is circumferentially spaced with first connecting blocks (12) extending axially. The driven adapter plate (2) includes a second adapter plate flange (21) and a second connecting surface extending axially along the middle of the second adapter plate flange (21). The second connecting surface is circumferentially spaced with second connecting blocks (22) extending axially. The spacer shaft (3) includes spacer shaft flanges (31) arranged opposite each other along the axial direction and a third connecting surface extending axially along the middle of each spacer shaft flange (31), and third connecting blocks (32) extending axially are distributed circumferentially along each third connecting surface. Among them, the first adapter flange (11) and the second adapter flange (21) are respectively provided with diaphragm assemblies (6) between them and the corresponding spacer shaft flange (31). The first connecting surface and its corresponding third connecting surface are connected by the engagement of the first connecting block (12) and the third connecting block (32); the second connecting surface and its corresponding third connecting surface are connected by the engagement of the second connecting block (22) and the third connecting block (32).

2. The double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 1, characterized in that, The first connecting block (12) and the second connecting block (22) respectively cooperate with one end of the third connecting block (32) in the circumferential direction through the first contact surface (4).

3. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 2, characterized in that, The first contact surface (4) includes a first mating surface (41), a second mating surface (42) and a third mating surface (43) arranged at an angle. The first mating surface (41) and the third mating surface (43) extend relative to each other at both ends of the second mating surface (42) and are both arranged at an angle to the second mating surface (42).

4. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 3, characterized in that, The second mating surface (42) is arranged radially on one side of the central axis of the spacer shaft (3) and extends circumferentially. The first mating surface (41) and the third mating surface (43) are arranged circumferentially at intervals along the central axis of the spacer shaft (3) and extend radially.

5. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 3, characterized in that, The first mating surface (41), the second mating surface (42), and the third mating surface (43) are planar or arc-shaped mating surfaces.

6. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 2, characterized in that, The first connecting block (12) and the second connecting block (22) respectively engage with the other end of the third connecting block (32) in the circumferential direction through the second contact surface (5).

7. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 2, characterized in that, The second contact surface (5) is a planar or arc surface.

8. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 1, characterized in that, First bolt holes (111) are distributed at intervals along the circumference of the first adapter flange (11). First clearance holes (211) are distributed circumferentially along the flange (21) of the second adapter plate. A second clearance hole (311) is circumferentially spaced along one of the spacer shaft flanges (31) of the spacer shaft (3); a second bolt hole (312) is circumferentially spaced along the other spacer shaft flange (31) of the spacer shaft (3). The first bolt hole (111) and the second clearance hole (311) are respectively provided and connected by a first connecting component (7a); the first clearance hole (211) and the second bolt hole (312) are respectively provided and connected by a second connecting component (7b).

9. A double diaphragm coupling for limiting radial displacement and providing overload protection according to claim 8, characterized in that, The first connecting assembly (7a) and / or the second connecting assembly (7b) include a bushing (71), a tapered washer (72), a spacer shaft (3), a reamed bolt (74), and a nut (75); The reamed bolt (74) passes through the corresponding first bolt hole (111) or second bolt hole (312), and passes through the corresponding first diaphragm assembly (6) or second diaphragm assembly (6), the conical washer (72), and the bushing (71) in sequence, and then passes out through the corresponding first clearance hole (211) or second clearance hole (311) and is fastened to the nut (75); The bushing (71) is disposed in the first clearance hole (211) or the second clearance hole (311), and a radial gap is provided between the outer peripheral surface of the bushing (71) and the hole wall of the first clearance hole (211) or the second clearance hole (311).

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