Auxiliary force starting device and method for permanent magnet coupling

Abstract

The application discloses an auxiliary strong starting device and method for a permanent magnet coupling. The auxiliary strong starting device cooperates with the permanent magnet coupling to transmit kinetic energy output by a prime mover to a load device, and comprises a hollow shaft, a dynamic clutch disc, a static clutch disc and a centrifugal assembly. When the rotation speed of the prime mover is less than a threshold value, the static clutch disc and the dynamic clutch disc remain in a coupling state to output the kinetic energy output by the prime mover to an input shaft of the load device in a mechanical coupling mode. When the rotation speed of the prime mover is greater than or equal to the threshold value, the centrifugal assembly drives the dynamic clutch disc to move, so that the static clutch disc and the dynamic clutch disc are in a separation state, and the kinetic energy output by the prime mover is output to the input shaft of the load device in a magnetic field coupling mode.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet coupling technology, specifically relating to an auxiliary powerful starting device and method for permanent magnet couplings. Background Technology

[0002] Permanent magnet couplings are a new type of coupling that uses magnetic coupling to transfer energy. Their key feature is that the prime mover and the load equipment do not rely on a mechanical connection; instead, mechanical energy is transferred entirely through magnetic field coupling. Structurally, permanent magnet couplings achieve the effect of transmitting force without mechanical contact. Permanent magnet couplings offer flexible transmission, vibration isolation, and noise reduction, effectively reducing wear caused by mechanical connections in other types of couplings. However, because the maximum magnetic field coupling strength of permanent magnet couplings is relatively low, typically 1-3 times the rated torque of the prime mover, when the equipment starts under load, the starting torque of the prime mover can reach more than 4 times the rated torque. At this point, due to insufficient maximum torque transmission capacity, the permanent magnet coupling experiences slippage between the driving and driven rotors, failing to transfer the full torque output from the prime mover to the load side, resulting in the load equipment failing to start.

[0003] Therefore, there is an urgent need to develop an auxiliary powerful starting device and method for permanent magnet couplings that overcomes the above-mentioned defects. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an auxiliary powerful starting device for permanent magnet couplings, wherein the auxiliary powerful starting device, in conjunction with the permanent magnet coupling, transmits the kinetic energy output from the prime mover to a load device. The auxiliary powerful starting device includes:

[0005] A hollow shaft, one end of which is connected to the output shaft of the permanent magnet coupling, and the other end of which is connected to the input shaft of the load device;

[0006] A movable clutch disc is sleeved and connected to the hollow shaft, and the movable clutch disc can slide axially on the hollow shaft;

[0007] A stationary clutch disc is connected to the eddy current assembly of the permanent magnet coupling. The stationary clutch disc is sleeved on the outside of the moving clutch disc and is detachably connected to the moving clutch disc.

[0008] A centrifugal assembly is sleeved on the hollow shaft and connected to the moving clutch disc. The centrifugal assembly outputs a preload force to press against the moving clutch disc, so that the stationary clutch disc and the moving clutch disc remain connected.

[0009] Specifically, when the rotational speed of the prime mover is less than a threshold, the stationary clutch disc and the moving clutch disc remain connected to output the kinetic energy of the prime mover to the input shaft of the load device through mechanical coupling; when the rotational speed of the prime mover is greater than or equal to the threshold, the centrifugal assembly drives the moving clutch disc to move, causing the stationary clutch disc and the moving clutch disc to separate, so that the kinetic energy of the prime mover is output to the input shaft of the load device through magnetic coupling.

[0010] The aforementioned auxiliary powerful start-up device, wherein the centrifugal assembly includes:

[0011] A diaphragm spring is sleeved on the hollow shaft and abuts against the moving clutch disc; the diaphragm spring outputs the preload force.

[0012] A retaining ring is sleeved on the hollow shaft, and the retaining ring presses against the diaphragm spring to form the preload force;

[0013] A centrifugal ring is sleeved on the retaining ring and connected to the moving clutch disc;

[0014] At least one counterweight is disposed between the centrifugal ring and the retaining ring;

[0015] When the rotational speed of the prime mover is equal to the threshold, the counterweight is subjected to centrifugal force and generates a centrifugal force component on the centrifugal ring. When the centrifugal force component exceeds the preload, the counterweight drives the moving clutch disc to separate from the stationary clutch disc through the centrifugal ring.

[0016] The aforementioned auxiliary powerful start-up device, wherein the centrifugal assembly further includes:

[0017] A round nut is fitted onto the hollow shaft and presses against the retaining ring. The magnitude of the preload is adjusted by rotating the round nut.

[0018] The aforementioned auxiliary powerful starting device, wherein the hollow shaft comprises:

[0019] A connecting flange is used to connect to the output shaft of the permanent magnet coupling;

[0020] The first ring platform is protruding from the connecting flange and located on the side away from the output shaft of the permanent magnet coupling. The inner side of the moving clutch disc is connected to the first ring platform via a spline.

[0021] The second ring platform protrudes from the first ring platform and is located on the side away from the connecting flange, and the retaining ring is sleeved on the second ring platform;

[0022] The third ring platform protrudes from the second platform and is located on the side away from the first ring platform, and the round nut is sleeved on the third ring platform;

[0023] A load connection shaft is connected to the third platform and to the side away from the second ring platform. The load connection shaft is sleeved and connected to the input shaft of the load device.

[0024] The aforementioned auxiliary force starting device further includes a locking component, which is arranged around the load connecting shaft. The locking component presses the load connecting shaft to lock the load connecting shaft onto the input shaft of the load device.

[0025] The aforementioned auxiliary powerful starting device, wherein the moving clutch disc includes:

[0026] Moving plate body;

[0027] A first protrusion is disposed on the moving disc body and located on the side close to the stationary clutch disc. A first spline structure is provided on the inner side of the first protrusion. The first spline structure extends from the first protrusion to the inner side of the moving disc body. The first spline structure is connected to a second spline structure provided on the outer side of the first ring platform so that the moving clutch disc can slide axially on the hollow shaft.

[0028] The aforementioned auxiliary powerful starting device, wherein the static clutch disc includes:

[0029] The stationary disc body is connected to the eddy current assembly of the permanent magnet coupling;

[0030] The second protrusion is disposed on the stationary disc body and located on the side close to the moving disc body. One end of the second protrusion is provided with a third spline structure. The side of the moving disc body opposite to the stationary disc body is provided with a fourth spline structure surrounding the first protrusion. When the third spline structure and the fourth spline structure are connected, the stationary clutch disc and the moving clutch disc remain connected.

[0031] The aforementioned auxiliary powerful starting device, wherein the centrifugal ring comprises:

[0032] A centrifugal disc body is provided with a plurality of first radial grooves spaced apart thereon, and at least one of the aforementioned counterweights is respectively disposed in the first radial grooves;

[0033] An annular baffle is connected to the centrifugal disc and surrounds multiple first radial grooves. The annular baffle is provided with multiple connecting holes at different positions. The annular baffle can be selectively connected to the dynamic clutch disc through the connecting holes to adapt to different preload forces.

[0034] When the counterweight moves outward under the action of the centrifugal force component, it forces the centrifugal ring to move axially away from the stationary clutch disc, and the centrifugal ring drives the moving clutch disc to move so as to separate from the stationary clutch disc.

[0035] In the aforementioned auxiliary powerful starting device, multiple scale marks are provided on the end face of the third ring platform facing the load connecting shaft, and a scale pointer is provided on the end face of the round nut facing the centrifugal ring. Rotating the round nut so that the scale pointer corresponds to any of the scale marks can adjust the magnitude of the preload.

[0036] The present invention also provides an auxiliary force starting method for a permanent magnet coupling, wherein the kinetic energy output from the prime mover is transmitted to a load device in conjunction with the permanent magnet coupling, and the auxiliary force starting method includes:

[0037] Before the speed of the prime mover reaches the set threshold, the dynamic clutch disc and the stationary clutch disc are kept in a mechanically connected state so that the kinetic energy output by the prime mover is output to the input shaft of the load device through mechanical coupling.

[0038] Once the prime mover reaches the threshold speed, the centrifugal assembly drives the moving clutch disc to move, causing the stationary clutch disc to separate from the moving clutch disc. This switches the kinetic energy output by the prime mover to be output to the input shaft of the load device via magnetic field coupling.

[0039] When the rotational speed of the prime mover exceeds the threshold, the stationary clutch disc and the moving clutch disc remain separated, so as to maintain the kinetic energy output by the prime mover at the input shaft of the load device through magnetic field coupling.

[0040] The advantages of this invention compared to existing technologies are as follows: This invention enables permanent magnet couplings to not only transmit kinetic energy through magnetic field coupling, but also to transmit kinetic energy through mechanical coupling, and to achieve automatic switching between magnetic field coupling and mechanical coupling. At the same time, this invention can increase the maximum torque transmission multiple of permanent magnet couplings from 1-3 times to more than 4 times, and expand the working characteristics of permanent magnet couplings from flexible transmission to a combination of rigidity and flexibility, meeting the high torque requirements of load equipment during load start-up, and increasing the applicability of permanent magnet couplings.

[0041] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the auxiliary powerful starting device of the present invention;

[0044] Figure 2 This is a cross-sectional view of the auxiliary powerful starting device of the present invention;

[0045] Figure 3 This is a schematic diagram showing the connection between the moving clutch disc and the stationary clutch disc.

[0046] Figure 4 A schematic diagram showing the separation of the moving clutch disc and the stationary clutch disc;

[0047] Figure 5 This is a schematic diagram of the hollow shaft structure;

[0048] Figure 6 This is a schematic diagram of the moving clutch disc.

[0049] Figure 7 This is a schematic diagram of the static clutch disc;

[0050] Figure 8a This is a schematic diagram of the centrifugal ring structure;

[0051] Figure 8b This is a schematic diagram of the structure of the centrifugal ring and counterweight.

[0052] Figure 9 This is a schematic diagram of the retaining ring structure;

[0053] Figure 10 This is a schematic diagram of a diaphragm spring.

[0054] Figure 11 This is a flowchart of the assisted powerful start-up method of the present invention. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] The illustrative embodiments and descriptions of the present invention are used to explain the invention, but are not intended to limit the invention. Furthermore, elements / components using the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0057] The terms "first," "second," "S1," "S2," etc., used in this document do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish elements or operations described using the same technical terms.

[0058] The directional terms used in this article, such as up, down, left, right, front, or back, are for reference only when referring to the accompanying drawings. Therefore, the use of directional terms is for illustrative purposes and not to limit this work.

[0059] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0060] The term "and / or" as used herein includes any or all of the things mentioned.

[0061] The term "multiple" in this article includes "two" and "more than two"; the term "multiple groups" in this article includes "two groups" and "more than two groups".

[0062] Certain terms used to describe this application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the application.

[0063] Please see Figures 1-3 , Figure 1 This is a schematic diagram of the auxiliary powerful starting device of the present invention; Figure 2 This is a cross-sectional view of the auxiliary powerful starting device of the present invention; Figure 3 This is a schematic diagram showing the connection between the moving clutch disc and the stationary clutch disc. Figure 4 This is a schematic diagram showing the separation of the moving clutch disc and the stationary clutch disc. Figures 1-4As shown, the auxiliary powerful starting device 1 for a permanent magnet coupling of the present invention is used to cooperate with the permanent magnet coupling 2 to transmit the kinetic energy output by the prime mover (not shown) to a load device (not shown). The auxiliary powerful starting device 2 includes: a hollow shaft 21, a moving clutch disc 22, a stationary clutch disc 23, and a centrifugal assembly 24; one end of the hollow shaft 21 is connected to the output shaft of the permanent magnet coupling 1, and the other end of the hollow shaft 21 is connected to the input shaft of the load device (not shown); the moving clutch disc 22 is sleeved and connected to the hollow shaft 21, and the moving clutch disc 22 can slide axially on the hollow shaft 21; the stationary clutch disc 23 is connected to the eddy current assembly 11 of the permanent magnet coupling, and the stationary clutch disc 23 is sleeved on the outside of the moving clutch disc 22 and is detachably connected to the moving clutch disc. 22; The centrifugal assembly 24 is sleeved on the hollow shaft 21 and connected to the moving clutch disc 22. The centrifugal assembly 24 outputs a preload force to press against the moving clutch disc 22, so that the stationary clutch disc 23 and the moving clutch disc 22 remain connected. When the speed of the prime mover is less than a threshold, the stationary clutch disc 23 and the moving clutch disc 22 remain connected, so that the kinetic energy output by the prime mover is output to the input shaft of the load device through mechanical coupling. When the speed of the prime mover is greater than or equal to the threshold, the centrifugal assembly 24 drives the moving clutch disc 22 to move, so that the stationary clutch disc 23 and the moving clutch disc 22 are separated, so that the kinetic energy output by the prime mover is output to the input shaft of the load device through magnetic field coupling.

[0064] Specifically, the hollow shaft 21 provides support for other components of the auxiliary powerful starting device. One end of the hollow shaft is connected to the output shaft of the permanent magnet coupling 1 by screws, and the other end of the hollow shaft is a hollow shaft structure with tensioning function, which is connected to the input shaft of the load device. The stationary clutch disc 23 is connected to the eddy current component on the active rotor assembly of the permanent magnet coupling 1 by screws. When the speed of the prime mover is less than a threshold, the speed of the permanent magnet coupling 1 is also lower than the threshold. At this time, the moving clutch disc 22 and the stationary clutch disc 23 remain connected. The kinetic energy output by the permanent magnet coupling 1 is transferred from the stationary clutch disc 23 to the moving clutch disc 22. The moving clutch disc 22 transfers the kinetic energy to the hollow shaft 21. The moving clutch disc 22 can slide axially on the hollow shaft 21, and the hollow shaft 21 transfers the kinetic energy to the load device.

[0065] Therefore, by adding this invention to the permanent magnet coupling, the permanent magnet coupling can not only transmit kinetic energy through magnetic field coupling, but also transmit power through mechanical coupling, and can automatically switch between magnetic field coupling and mechanical coupling. This invention enhances the maximum torque transmission capacity of the permanent magnet coupling. During the initial startup of the prime mover, the maximum torque transmission multiple of the permanent magnet coupling is increased from 1-3 times to more than 4 times through mechanical connection, meeting the high torque requirements of the load equipment during startup. After the working load equipment startup phase is completed, the permanent magnet coupling's auxiliary powerful starting component can automatically disengage, automatically switching the connection between the prime mover and the load equipment from mechanical connection to magnetic field coupling, achieving functions such as vibration isolation and noise reduction. The working characteristics of the permanent magnet coupling are expanded from flexible transmission to a combination of rigidity and flexibility, increasing the applicability of the permanent magnet coupling.

[0066] The centrifugal assembly 24 includes: a diaphragm spring 241, a retaining ring 242, a centrifugal ring 243, at least one counterweight 244, and a round nut 245. The diaphragm spring 241 is sleeved on the hollow shaft 21 and abuts against the moving clutch disc 22, and the diaphragm spring 241 outputs the preload force; the retaining ring 242 is sleeved on the hollow shaft 21, and the retaining ring 242 presses against the diaphragm spring 241 to form the preload force; the centrifugal ring 243 is sleeved on the retaining ring 242 and connected to the moving clutch disc 22; at least one counterweight 244... The counterweight 244 is positioned between the centrifugal ring 243 and the retaining ring 242. When the rotational speed of the prime mover is equal to the threshold, the counterweight 243 is subjected to centrifugal force, generating a centrifugal force component on the centrifugal ring 243. When the centrifugal force component exceeds the preload, the counterweight 244 drives the moving clutch disc 22 to separate from the stationary clutch disc 23 through the centrifugal ring 243. The round nut 245 is positioned on the hollow shaft 21 and presses against the retaining ring 242. The magnitude of the preload is adjusted by rotating the round nut 245.

[0067] Specifically, the centrifugal ring 243 and the moving clutch disc 22 are fixed as a whole by connecting screws to achieve synchronous movement. The outer circumference of the centrifugal ring 243 has connecting holes K1 at different distances from the end face to accommodate the fixing requirements of the centrifugal ring 243 and the moving clutch disc 22 at different positions when the diaphragm spring 241 is in different preload states. The inner wall of the centrifugal ring 243 is conical. When the counterweight 244 moves outward under the action of centrifugal force, it can force the centrifugal ring 243 to move axially. One side of the retaining ring 242 cooperates with the diaphragm spring 241 to force the diaphragm spring 241 to press the moving clutch disc 22, providing preload to the moving clutch disc 22. The inner hole K2 of the retaining ring 242 is circular and is fitted on the hollow shaft 21 and pressed by the round nut 245. The preload of the diaphragm spring 241 can be adjusted by adjusting the number of turns of the round nut 245.

[0068] In this embodiment, a round nut set screw 246 is installed on the round nut 245 to prevent the round nut 245 from loosening or slipping.

[0069] This invention achieves clutch switching by monitoring the rotational speed of the permanent magnet coupling. By adjusting the number of turns of the round nut, the rotational speed threshold corresponding to the centrifugal mechanism when performing clutch switching can be conveniently and accurately adjusted to adapt to the working requirements of different load devices.

[0070] Please refer to Figure 5 And please combine Figures 1-4 , Figure 5 This is a schematic diagram of the hollow shaft. Figure 5 As shown, the hollow shaft 21 includes: a connecting flange 211, a first annular platform 212, a second annular platform 213, a third annular platform 214, and a load connecting shaft 215; the connecting flange 211 is connected to the output shaft of the permanent magnet coupling 1; the first annular platform 212 protrudes from the connecting flange 211 and is located on the side away from the output shaft of the permanent magnet coupling 1, and the inner side of the moving clutch disc 22 is connected to the first annular platform 212 via a spline; the second annular platform 213 protrudes from the first annular platform 214. The retaining ring 242 is sleeved on the second ring platform 213 on the side of the platform 212 away from the connecting flange 211; the third ring platform 214 protrudes from the second platform 213 and is located on the side away from the first ring platform 212, and the round nut 245 is sleeved on the third ring platform 214; the load connecting shaft 215 is connected to the third platform 214 on the side away from the second ring platform 213, and the load connecting shaft 215 is sleeved and connected to the input shaft of the load device.

[0071] In this embodiment, the connecting flange 211, the first ring platform 212, the second ring platform 213, the third ring platform 214, and the load connecting shaft 215 are an integral structure, but the present invention is not limited thereto.

[0072] Specifically, the load connecting shaft 215 is a hollow shaft structure with tensioning function. The auxiliary powerful starting device of the present invention also includes a locking component 25, which is arranged around the load connecting shaft 215. The load connecting shaft 215 is locked to the input shaft of the load device by the locking component 25 and the locking screw L2, so as to prevent axial sliding between the hollow shaft 21 and the input shaft of the load device.

[0073] In this embodiment, a plurality of scale marks T1 are provided on the end face of the third ring platform 214 facing the load connecting shaft 215, and a scale pointer T2 is provided on the end face of the round nut 245 facing the centrifugal ring 243. By rotating the round nut 245 so that the scale pointer T2 corresponds to any of the scale marks T1, the magnitude of the preload can be adjusted. The magnitude of the preload of the diaphragm spring 241 can be conveniently adjusted by reading the pointer.

[0074] Please refer to Figure 6 , Figure 10 And please combine Figures 1-4 , Figure 6 This is a schematic diagram of the moving clutch disc. Figure 10 This is a schematic diagram of a diaphragm spring. Figure 6 As shown, the moving clutch disc 22 includes a moving disc body 221 and a first boss portion 222. The first boss portion 222 is disposed on the moving disc body 221 and located on the side close to the stationary clutch disc 23. A first spline structure S1 is disposed on the inner side of the first boss portion 222. The first spline structure S1 extends from the first boss portion 222 to the inner side of the moving disc body 221, that is, the first spline structure S1 penetrates the first boss portion 222 and the inner side of the moving disc body 221. The first spline structure S1 is engaged and connected with a second spline structure H2 disposed on the outer side of the first ring portion 212, so that the moving clutch disc 22 can slide axially on the hollow shaft 21. The side of the moving disc 221 that is away from the diaphragm spring 241 is squeezed by the diaphragm spring 241. The inner hole of the moving clutch disc 22 has an internal spline structure, which forms a spline pair with the external spline of the first annular platform 212, thereby realizing the transmission of energy from the moving clutch disc 22 to the hollow shaft 21. The moving clutch disc 22 can slide axially on the hollow shaft 21.

[0075] Please refer to Figure 7 And please combine Figures 1-4 , Figure 7 This is a schematic diagram of the static clutch disc. (See attached diagram.) Figure 7 As shown, the stationary clutch disc 23 includes a stationary disc body 231 and a second protrusion portion 232. The stationary disc body 231 is connected to the eddy current assembly of the permanent magnet coupling 1. The second protrusion portion 232 is disposed on the stationary disc body 231 and located on the side close to the moving disc body 22. One end of the second protrusion portion 232 is provided with a third spline structure S3. The side of the moving disc body 22 opposite to the stationary disc body 23 is provided with a fourth spline structure S4 surrounding the first protrusion portion 222. When the third spline structure S3 and the fourth spline structure S4 are connected, the stationary clutch disc 23 and the moving clutch disc 22 remain connected. One side of the stationary clutch disc 22 has an end-tooth spline structure, which forms a spline pair with the end-tooth spline on the moving disc body 22, thereby realizing the transfer of energy from the stationary clutch disc 23 to the moving clutch disc 22.

[0076] Please refer to Figure 8a and Figure 8b And please combine Figures 1-4 , Figure 8a This is a schematic diagram of the centrifugal ring structure; Figure 8b This is a schematic diagram of the centrifugal ring and counterweight. Figure 8a and Figure 8b As shown, the centrifugal ring 243 includes: a centrifugal disc body 2431 and an annular baffle portion 2432. The centrifugal disc body 2431 has a taper and is provided with a plurality of first radial grooves C1 spaced apart. At least one of the counterweights 244 is respectively disposed in the first radial grooves C1. The annular baffle portion 2432 is connected to the centrifugal disc body 2431 and surrounds the plurality of first radial grooves C1. The annular baffle portion 2432 is provided with a plurality of connecting holes K1 at different positions. The annular baffle portion 2432 can be selectively connected to the moving clutch disc 22 through the connecting holes K1 and the screws L1 to adapt to different preload forces. When the counterweight 244 moves outward under the action of the centrifugal force component, it forces the centrifugal ring 243 to move axially away from the stationary clutch disc 23. The centrifugal ring 243 drives the moving clutch disc 22 to move and separate from the stationary clutch disc 23. The depth of the first radial groove C1 gradually increases from one end of the fitting annular enclosure 2432. Specifically, the centrifugal disc 2431 is provided with the first radial groove C1, which guides the radial movement of the counterweight 244. Simultaneously, the first radial groove C1 ensures that the counterweight 244 is evenly distributed on the working cone surface of the centrifugal ring 243, guaranteeing the dynamic balance performance of the auxiliary powerful starting assembly for the permanent magnet coupling during rotation. In this embodiment, a spherical shape for the counterweight 244 is preferred, but the invention is not limited to this; in other embodiments, the counterweight 244 may also be cylindrical or other shapes.

[0077] It should be noted that the present invention has an integral structure, which is simple and convenient to install and debug. The centrifugal ring is designed as an integral protective cover structure, which effectively seals and protects the working surfaces of the hollow shaft, the moving clutch disc, the retaining ring and other mechanical parts, thereby enhancing the protective capability of the present invention. It has strong adaptability and stability when used in high dust, high corrosion and high humidity environments.

[0078] In this embodiment, a second radial groove C2 is also provided between two adjacent first radial grooves C1, and the centrifugal ring is reduced in weight through the second radial groove C2.

[0079] Please refer to Figure 9 And please combine Figures 1-4 , Figure 9 This is a schematic diagram of the retaining ring structure. (Example) Figure 9 As shown, the retaining ring 242 includes: a retaining ring disc body 2421, a third boss portion 2422 disposed on one side end face of the retaining ring disc body 2421, and a fourth boss portion 2423 disposed on the other side end face of the retaining ring disc body 2421. The third boss portion 2422 is disposed on the side end face of the retaining ring disc body 2421 near the moving clutch disc 22, and the fourth boss portion 2423 is disposed on the other side end face of the retaining ring disc body 2421 away from the moving clutch disc 22. The inner diameter of the fourth boss portion 2423 is smaller than the inner diameter of the third boss portion 2422. The round nut 245 abuts against the fourth boss portion 2423 so that the third boss portion 2422 and the side end face of the retaining ring disc body 2421 near the moving clutch disc 22 press against the diaphragm spring 241 to form a preload force.

[0080] Connecting flange 211, first ring platform 212, second ring platform 213, third ring platform 214 and load connecting shaft 215

[0081] Please refer to the following: Figure 1-4 The assembly process and working method of this invention are described in detail below:

[0082] 1. The left side of the hollow shaft 21 has a positioning step and a connecting flange 211, which is connected to the output shaft of the permanent magnet coupling 1 by screws. The inner diameter of the right side of the hollow shaft 21 is the same as the outer diameter of the input shaft of the load equipment, and it is machined with a keyway and a tensioning groove. During on-site installation, the right side of the hollow shaft 21 is fitted onto the input shaft of the load equipment and locked in place by the locking sleeve 25.

[0083] 2. The stationary clutch disc 23 is connected to the eddy current assembly of the permanent magnet coupling 1 by screws. The right side of the stationary clutch disc 23 has an end tooth spline structure, which forms a spline pair with the end tooth spline on the moving clutch disc 22, thereby realizing the transfer of energy from the stationary clutch disc 23 to the moving clutch disc 22.

[0084] 3. The right side plane of the moving clutch disc 22 is always compressed by the diaphragm spring 241, forming a preload force. When the rotational speed of the permanent magnet coupling 1 is lower than the set threshold, the moving clutch disc 22 is forced to maintain the connection with the stationary clutch disc 23. The inner hole of the moving clutch disc 22 has an internal spline structure, which forms a spline pair with the external spline of the hollow shaft 21, realizing the transmission of energy from the moving clutch disc 22 to the hollow shaft 21. While transmitting energy, the moving clutch disc 22 can still move axially on the hollow shaft 21.

[0085] 4. The centrifugal assembly 24 can monitor the rotational speed of the permanent magnet coupling 1 and switch the engagement / disengagement state of the static clutch disc 23 and the dynamic clutch disc 22 according to the actual working speed.

[0086] The working principle of this invention is as follows:

[0087] 1. Before the prime mover starts, the actual speed of the load equipment is zero. At this time, the counterweight 244 is under the preload force of the diaphragm spring 241 and is in the initial position at the innermost side of the radial groove C1 of the centrifugal ring 243. The moving clutch disc 22 is also under the preload force of the diaphragm spring 241 and is in a mechanical connection with the stationary clutch disc 23.

[0088] 2. During the initial startup of the prime mover, the speed gradually increases from zero. Before reaching the set speed threshold, the moving clutch disc 22 is always under the preload force of the diaphragm spring 241 and is mechanically connected to the stationary clutch disc 23. This stage is the startup stage of the load equipment. The mechanical kinetic energy of the prime mover's rotation is transmitted to the stationary clutch disc 23 through the eddy current assembly of the permanent magnet coupling directly connected to it, then to the moving clutch disc 22 through the end spline of the stationary clutch disc 23, then to the hollow shaft 21 through the internal spline of the moving clutch disc 22, and finally to the input shaft of the load equipment through the key in the right inner hole of the hollow shaft 21. Because the permanent magnet coupling with the auxiliary powerful starting assembly is always mechanically connected during this stage, all the starting torque of the prime mover can be completely transmitted to the load equipment to meet the high torque requirements of the load equipment when starting under load.

[0089] 3. During the later stages of prime mover startup, after the rotational speed reaches the threshold set by the centrifugal assembly 24, the horizontal rightward centrifugal force component of the counterweight 244 acting on the conical surface of the groove C1 of the centrifugal ring 243 exceeds the preload provided by the diaphragm spring 241. The counterweight 244 begins to move outward gradually along the radial groove C1 of the centrifugal ring 243, pushing the centrifugal ring 243 to move the moving clutch disc 22 to the right, while simultaneously forcing the moving clutch disc 22 to continuously compress the diaphragm spring 241. When the moving clutch disc 22 moves a certain distance to the right, the end tooth spline pair of the moving clutch disc 22 and the stationary clutch disc 23 separates. At this time, the connection between the prime mover and the load equipment changes from the mechanical connection provided by the permanent magnet coupling with the auxiliary powerful starting assembly to the magnetic field coupling of the permanent magnet coupling body. Under the action of the magnetic field coupling, the rotational speed continues to increase to the rated speed of the prime mover until the load equipment completes startup.

[0090] 4. After the prime mover starts, since the rated operating speed is much greater than the threshold set by the centrifugal assembly 24, the counterweight 244 is always at the outermost edge of the radial groove C1 of the centrifugal ring 243, the end tooth spline pair of the moving clutch disc 22 and the stationary clutch disc 23 is always in a separated state, and the connection between the prime mover and the load equipment is always the magnetic field coupling of the permanent magnet coupling body, thereby realizing the working characteristics of the permanent magnet coupling such as flexible transmission, vibration isolation, and noise reduction.

[0091] 5. After the prime mover stops, the rotational speed gradually decreases. When the rotational speed falls below the threshold set by the centrifugal assembly 24, the horizontal rightward centrifugal force component of the centrifugal force acting on the conical surface of the groove C1 of the centrifugal ring 243, which is subjected to the counterweight 244, is less than the preload provided by the diaphragm spring 241. The counterweight 244 begins to move inward gradually along the radial groove C1 of the centrifugal ring 243. The centrifugal ring 243 drives the moving clutch disc 22 to move to the left, while the diaphragm spring 241 gradually returns to its initial state. When the moving clutch disc 22 moves to the left a certain distance, the end tooth spline pair of the moving clutch disc 22 and the stationary clutch disc 23 engages. At this time, the connection method between the prime mover and the load equipment changes from the magnetic field coupling of the permanent magnet coupling body to the mechanical connection provided by the auxiliary powerful starting component of the permanent magnet coupling, until the load equipment completely stops. At this point, the auxiliary powerful starting component of the permanent magnet coupling resets to its initial state.

[0092] To increase the set threshold of the centrifuge component 24, simply rotate the round nut 245 clockwise using a special wrench; conversely, to decrease the set threshold, simply rotate the round nut 245 counterclockwise using the same wrench. The rotation angle is referenced to the scale position indicated by the round nut 245, ensuring high adjustment precision. After adjustment, tighten the set screw 246 of the round nut to prevent it from loosening or slipping.

[0093] This invention is an optional accessory for permanent magnet couplings, fully compatible with the output side interface dimensions of permanent magnet couplings, and can be directly replaced with the universal output back wheel of permanent magnet couplings. In applications where load-bearing equipment does not require load-bearing start-up, the universal output back wheel component is used; however, in applications requiring load-bearing start-up functionality, simply replacing it with this invention completes the functional switch.

[0094] Please refer to Figure 11 , Figure 11 This is a flowchart of the assisted forceful starting method of the present invention. Figure 11 As shown, the present invention provides an auxiliary force starting method for a permanent magnet coupling, used to transfer the kinetic energy output from a prime mover to a load device in conjunction with the permanent magnet coupling. The auxiliary force starting method includes:

[0095] Step S1: Before the speed of the prime mover reaches the set threshold, the dynamic clutch disc and the stationary clutch disc are kept in a mechanically connected state so that the kinetic energy output by the prime mover is output to the input shaft of the load device through mechanical coupling.

[0096] Step S2: After the prime mover reaches the threshold speed, the centrifugal assembly drives the driven clutch disc to move, causing the stationary clutch disc and the driven clutch disc to separate, so as to switch the kinetic energy output by the prime mover to be output to the input shaft of the load device through magnetic field coupling.

[0097] Step S3: After the speed of the prime mover exceeds the threshold, the stationary clutch disc and the moving clutch disc remain in a separated state so as to maintain the kinetic energy output by the prime mover to be output to the input shaft of the load device through magnetic field coupling.

[0098] In summary, this invention has the following advantages: By adding this invention to the permanent magnet coupling, the permanent magnet coupling can not only achieve kinetic energy transmission through magnetic field coupling, but also has the ability to transmit power through mechanical coupling, and can automatically switch between magnetic field coupling and mechanical coupling. This invention enhances the maximum torque transmission capacity of the permanent magnet coupling. In the initial stage of prime mover startup, through mechanical connection, the maximum torque transmission multiple of the permanent magnet coupling is increased from 1-3 times to more than 4 times, meeting the high torque requirements of the load equipment during load startup. After the working load equipment startup phase is completed, the permanent magnet coupling auxiliary powerful starting component can automatically separate, automatically switching the connection between the prime mover and the load equipment from mechanical connection to magnetic field coupling, realizing the functions of vibration isolation and noise reduction of the permanent magnet coupling. The working characteristics of the permanent magnet coupling are expanded from flexible transmission to a combination of rigidity and flexibility, increasing the applicability of the permanent magnet coupling.

[0099] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary high-power starting device for permanent magnet couplings, characterized in that, The auxiliary powerful starting device, in conjunction with a permanent magnet coupling, transmits the kinetic energy output from the prime mover to a load device. A hollow shaft, one end of which is connected to the output shaft of the permanent magnet coupling, and the other end of which is connected to the input shaft of the load device; A movable clutch disc is sleeved and connected to the hollow shaft, and the movable clutch disc can slide axially on the hollow shaft; A stationary clutch disc is connected to the eddy current assembly of the permanent magnet coupling. The stationary clutch disc is sleeved on the outside of the moving clutch disc and is detachably connected to the moving clutch disc. A centrifugal assembly is sleeved on the hollow shaft and connected to the moving clutch disc. The centrifugal assembly outputs a preload force to press against the moving clutch disc, so that the stationary clutch disc and the moving clutch disc remain connected. Specifically, when the speed of the prime mover is less than a threshold, the stationary clutch disc and the moving clutch disc remain connected to output the kinetic energy of the prime mover to the input shaft of the load device through mechanical coupling; when the speed of the prime mover is greater than or equal to the threshold, the centrifugal assembly drives the moving clutch disc to move, causing the stationary clutch disc and the moving clutch disc to separate, so that the kinetic energy of the prime mover is output to the input shaft of the load device through magnetic coupling. The centrifugation assembly includes: A diaphragm spring is sleeved on the hollow shaft and abuts against the moving clutch disc; the diaphragm spring outputs the preload force. A retaining ring is sleeved on the hollow shaft, and the retaining ring presses against the diaphragm spring to form the preload force; A centrifugal ring is sleeved on the retaining ring and connected to the moving clutch disc; At least one counterweight is disposed between the centrifugal ring and the retaining ring; When the rotational speed of the prime mover is equal to the threshold, the counterweight is subjected to centrifugal force and generates a centrifugal force component on the centrifugal ring. When the centrifugal force component exceeds the preload, the counterweight drives the moving clutch disc to separate from the stationary clutch disc through the centrifugal ring.

2. The auxiliary powerful starting device as described in claim 1, characterized in that, The centrifugal assembly further includes a round nut, which is sleeved on the hollow shaft and presses against the retaining ring, and the magnitude of the preload is adjusted by rotating the round nut.

3. The auxiliary powerful starting device as described in claim 2, characterized in that, The hollow shaft includes: A connecting flange is used to connect to the output shaft of the permanent magnet coupling; The first ring platform is protruding from the connecting flange and located on the side away from the output shaft of the permanent magnet coupling. The inner side of the moving clutch disc is connected to the first ring platform via a spline. The second ring platform protrudes from the first ring platform and is located on the side away from the connecting flange, and the retaining ring is sleeved on the second ring platform; The third ring platform protrudes from the second ring platform and is located on the side away from the first ring platform, and the round nut is sleeved on the third ring platform; A load connection shaft is connected to the third ring platform on the side away from the second ring platform, and the load connection shaft is sleeved and connected to the input shaft of the load device.

4. The auxiliary powerful starting device as described in claim 3, characterized in that, It also includes a locking assembly, which is arranged around the load connecting shaft to press the load connecting shaft to lock the load connecting shaft onto the input shaft of the load device.

5. The auxiliary powerful starting device as described in claim 3, characterized in that, The clutch disc includes: Moving plate body; A first protrusion is disposed on the moving disc body and located on the side close to the stationary clutch disc. A first spline structure is provided on the inner side of the first protrusion. The first spline structure extends from the first protrusion to the inner side of the moving disc body. The first spline structure is connected to a second spline structure provided on the outer side of the first ring platform so that the moving clutch disc can slide axially on the hollow shaft.

6. The auxiliary powerful starting device as described in claim 5, characterized in that, The static clutch disc includes: The stationary disc body is connected to the eddy current assembly of the permanent magnet coupling; The second protrusion is disposed on the stationary disc body and located on the side close to the moving disc body. One end of the second protrusion is provided with a third spline structure. The side of the moving disc body opposite to the stationary disc body is provided with a fourth spline structure surrounding the first protrusion. When the third spline structure and the fourth spline structure are connected, the stationary clutch disc and the moving clutch disc remain connected.

7. The auxiliary powerful starting device as described in claim 3, characterized in that, The centrifugal ring includes: A centrifugal disc body is provided with a plurality of first radial grooves spaced apart thereon, and at least one of the aforementioned counterweights is respectively disposed in the first radial grooves; An annular baffle is connected to the centrifugal disc and surrounds multiple first radial grooves. The annular baffle is provided with multiple connecting holes at different positions. The annular baffle can be selectively connected to the dynamic clutch disc through the connecting holes to adapt to different preload forces. When the counterweight moves outward under the action of the centrifugal force component, it forces the centrifugal ring to move axially away from the stationary clutch disc, and the centrifugal ring drives the moving clutch disc to move so as to separate from the stationary clutch disc.

8. The auxiliary powerful starting device as described in claim 3, characterized in that, The end face of the third ring platform facing the load connecting shaft is provided with multiple scale marks, and the end face of the round nut facing the centrifugal ring is provided with a scale pointer. Rotating the round nut so that the scale pointer corresponds to any of the scale marks can adjust the magnitude of the preload.

9. A method for auxiliary force starting of a permanent magnet coupling, characterized in that, The auxiliary powerful starting device applied to any one of claims 1-8, in conjunction with a permanent magnet coupling, transmits the kinetic energy output from the prime mover to a load device, the auxiliary powerful starting method comprising: Before the speed of the prime mover reaches the set threshold, the dynamic clutch disc and the stationary clutch disc are kept in a mechanically connected state so that the kinetic energy output by the prime mover is output to the input shaft of the load device through mechanical coupling. Once the prime mover reaches the threshold speed, the centrifugal assembly drives the moving clutch disc to move, causing the stationary clutch disc to separate from the moving clutch disc. This switches the kinetic energy output by the prime mover to be output to the input shaft of the load device via magnetic field coupling. When the rotational speed of the prime mover exceeds the threshold, the stationary clutch disc and the moving clutch disc remain separated, so as to maintain the kinetic energy output by the prime mover at the input shaft of the load device through magnetic field coupling.

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